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.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
62 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
63 import com.sun.tools.javac.tree.*;
64 import com.sun.tools.javac.tree.JCTree.*;
65 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
66 import com.sun.tools.javac.util.*;
67 import com.sun.tools.javac.util.DefinedBy.Api;
68 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
69 import com.sun.tools.javac.util.JCDiagnostic.Error;
70 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
71 import com.sun.tools.javac.util.JCDiagnostic.Warning;
72 import com.sun.tools.javac.util.List;
73
74 import static com.sun.tools.javac.code.Flags.*;
75 import static com.sun.tools.javac.code.Flags.ANNOTATION;
76 import static com.sun.tools.javac.code.Flags.BLOCK;
77 import static com.sun.tools.javac.code.Kinds.*;
78 import static com.sun.tools.javac.code.Kinds.Kind.*;
79 import static com.sun.tools.javac.code.TypeTag.*;
80 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
81 import static com.sun.tools.javac.tree.JCTree.Tag.*;
82 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final Symtab syms;
103 final Resolve rs;
104 final Operators operators;
105 final Infer infer;
106 final Analyzer analyzer;
107 final DeferredAttr deferredAttr;
108 final Check chk;
109 final Flow flow;
110 final MemberEnter memberEnter;
111 final TypeEnter typeEnter;
112 final TreeMaker make;
113 final ConstFold cfolder;
114 final Enter enter;
115 final Target target;
116 final Types types;
117 final Preview preview;
118 final JCDiagnostic.Factory diags;
119 final TypeAnnotations typeAnnotations;
120 final DeferredLintHandler deferredLintHandler;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127 final LocalProxyVarsGen localProxyVarsGen;
128
129 public static Attr instance(Context context) {
130 Attr instance = context.get(attrKey);
131 if (instance == null)
132 instance = new Attr(context);
133 return instance;
134 }
135
136 @SuppressWarnings("this-escape")
137 protected Attr(Context context) {
138 context.put(attrKey, this);
139
140 names = Names.instance(context);
141 log = Log.instance(context);
142 syms = Symtab.instance(context);
143 rs = Resolve.instance(context);
144 operators = Operators.instance(context);
145 chk = Check.instance(context);
146 flow = Flow.instance(context);
147 memberEnter = MemberEnter.instance(context);
148 typeEnter = TypeEnter.instance(context);
149 make = TreeMaker.instance(context);
150 enter = Enter.instance(context);
151 infer = Infer.instance(context);
152 analyzer = Analyzer.instance(context);
153 deferredAttr = DeferredAttr.instance(context);
154 cfolder = ConstFold.instance(context);
155 target = Target.instance(context);
156 types = Types.instance(context);
157 preview = Preview.instance(context);
158 diags = JCDiagnostic.Factory.instance(context);
159 annotate = Annotate.instance(context);
160 typeAnnotations = TypeAnnotations.instance(context);
161 deferredLintHandler = DeferredLintHandler.instance(context);
162 typeEnvs = TypeEnvs.instance(context);
163 dependencies = Dependencies.instance(context);
164 argumentAttr = ArgumentAttr.instance(context);
165 matchBindingsComputer = MatchBindingsComputer.instance(context);
166 attrRecover = AttrRecover.instance(context);
167 localProxyVarsGen = LocalProxyVarsGen.instance(context);
168
169 Options options = Options.instance(context);
170
171 Source source = Source.instance(context);
172 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
173 allowRecords = Feature.RECORDS.allowedInSource(source);
174 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
175 Feature.PATTERN_SWITCH.allowedInSource(source);
176 allowUnconditionalPatternsInstanceOf =
177 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
178 sourceName = source.name;
179 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
180
181 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
182 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
183 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
184 methodAttrInfo = new MethodAttrInfo();
185 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
186 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
187 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
188 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
189 allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
190 Feature.VALUE_CLASSES.allowedInSource(source);
191 }
192
193 /** Switch: reifiable types in instanceof enabled?
194 */
195 boolean allowReifiableTypesInInstanceof;
196
197 /** Are records allowed
198 */
199 private final boolean allowRecords;
200
201 /** Are patterns in switch allowed
202 */
203 private final boolean allowPatternSwitch;
204
205 /** Are unconditional patterns in instanceof allowed
206 */
207 private final boolean allowUnconditionalPatternsInstanceOf;
208
209 /** Are value classes allowed
210 */
211 private final boolean allowValueClasses;
212
213 /**
214 * Switch: warn about use of variable before declaration?
215 * RFE: 6425594
216 */
217 boolean useBeforeDeclarationWarning;
218
219 /**
220 * Switch: name of source level; used for error reporting.
221 */
222 String sourceName;
223
224 /** Check kind and type of given tree against protokind and prototype.
225 * If check succeeds, store type in tree and return it.
226 * If check fails, store errType in tree and return it.
227 * No checks are performed if the prototype is a method type.
228 * It is not necessary in this case since we know that kind and type
229 * are correct.
230 *
231 * @param tree The tree whose kind and type is checked
232 * @param found The computed type of the tree
233 * @param ownkind The computed kind of the tree
234 * @param resultInfo The expected result of the tree
235 */
236 Type check(final JCTree tree,
237 final Type found,
238 final KindSelector ownkind,
239 final ResultInfo resultInfo) {
240 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
241 Type owntype;
242 boolean shouldCheck = !found.hasTag(ERROR) &&
243 !resultInfo.pt.hasTag(METHOD) &&
244 !resultInfo.pt.hasTag(FORALL);
245 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
246 log.error(tree.pos(),
247 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
248 ownkind.kindNames()));
249 owntype = types.createErrorType(found);
250 } else if (inferenceContext.free(found)) {
251 //delay the check if there are inference variables in the found type
252 //this means we are dealing with a partially inferred poly expression
253 owntype = shouldCheck ? resultInfo.pt : found;
254 if (resultInfo.checkMode.installPostInferenceHook()) {
255 inferenceContext.addFreeTypeListener(List.of(found),
256 instantiatedContext -> {
257 ResultInfo pendingResult =
258 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
259 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
260 });
261 }
262 } else {
263 owntype = shouldCheck ?
264 resultInfo.check(tree, found) :
265 found;
266 }
267 if (resultInfo.checkMode.updateTreeType()) {
268 tree.type = owntype;
269 }
270 return owntype;
271 }
272
273 /** Is given blank final variable assignable, i.e. in a scope where it
274 * may be assigned to even though it is final?
275 * @param v The blank final variable.
276 * @param env The current environment.
277 */
278 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
279 Symbol owner = env.info.scope.owner;
280 // owner refers to the innermost variable, method or
281 // initializer block declaration at this point.
282 boolean isAssignable =
283 v.owner == owner
284 ||
285 ((owner.name == names.init || // i.e. we are in a constructor
286 owner.kind == VAR || // i.e. we are in a variable initializer
287 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
288 &&
289 v.owner == owner.owner
290 &&
291 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
292 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
293 return isAssignable & !insideCompactConstructor;
294 }
295
296 /** Check that variable can be assigned to.
297 * @param pos The current source code position.
298 * @param v The assigned variable
299 * @param base If the variable is referred to in a Select, the part
300 * to the left of the `.', null otherwise.
301 * @param env The current environment.
302 */
303 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
304 if (v.name == names._this) {
305 log.error(pos, Errors.CantAssignValToThis);
306 } else 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 }
318 }
319
320 /** Does tree represent a static reference to an identifier?
321 * It is assumed that tree is either a SELECT or an IDENT.
322 * We have to weed out selects from non-type names here.
323 * @param tree The candidate tree.
324 */
325 boolean isStaticReference(JCTree tree) {
326 if (tree.hasTag(SELECT)) {
327 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
328 if (lsym == null || lsym.kind != TYP) {
329 return false;
330 }
331 }
332 return true;
333 }
334
335 /** Is this symbol a type?
336 */
337 static boolean isType(Symbol sym) {
338 return sym != null && sym.kind == TYP;
339 }
340
341 /** Attribute a parsed identifier.
342 * @param tree Parsed identifier name
343 * @param topLevel The toplevel to use
344 */
345 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
346 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
347 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
348 syms.errSymbol.name,
349 null, null, null, null);
350 localEnv.enclClass.sym = syms.errSymbol;
351 return attribIdent(tree, localEnv);
352 }
353
354 /** Attribute a parsed identifier.
355 * @param tree Parsed identifier name
356 * @param env The env to use
357 */
358 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
359 return tree.accept(identAttributer, env);
360 }
361 // where
362 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
363 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
364 @Override @DefinedBy(Api.COMPILER_TREE)
365 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
366 Symbol site = visit(node.getExpression(), env);
367 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
368 return site;
369 Name name = (Name)node.getIdentifier();
370 if (site.kind == PCK) {
371 env.toplevel.packge = (PackageSymbol)site;
372 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
373 KindSelector.TYP_PCK);
374 } else {
375 env.enclClass.sym = (ClassSymbol)site;
376 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
377 }
378 }
379
380 @Override @DefinedBy(Api.COMPILER_TREE)
381 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
382 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
383 }
384 }
385
386 public Type coerce(Type etype, Type ttype) {
387 return cfolder.coerce(etype, ttype);
388 }
389
390 public Type attribType(JCTree node, TypeSymbol sym) {
391 Env<AttrContext> env = typeEnvs.get(sym);
392 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
393 return attribTree(node, localEnv, unknownTypeInfo);
394 }
395
396 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
397 // Attribute qualifying package or class.
398 JCFieldAccess s = tree.qualid;
399 return attribTree(s.selected, env,
400 new ResultInfo(tree.staticImport ?
401 KindSelector.TYP : KindSelector.TYP_PCK,
402 Type.noType));
403 }
404
405 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
406 return attribToTree(expr, env, tree, unknownExprInfo);
407 }
408
409 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
410 return attribToTree(stmt, env, tree, statInfo);
411 }
412
413 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
414 breakTree = tree;
415 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
416 try {
417 deferredAttr.attribSpeculative(root, env, resultInfo,
418 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
419 argumentAttr.withLocalCacheContext());
420 attrRecover.doRecovery();
421 } catch (BreakAttr b) {
422 return b.env;
423 } catch (AssertionError ae) {
424 if (ae.getCause() instanceof BreakAttr breakAttr) {
425 return breakAttr.env;
426 } else {
427 throw ae;
428 }
429 } finally {
430 breakTree = null;
431 log.useSource(prev);
432 }
433 return env;
434 }
435
436 private JCTree breakTree = null;
437
438 private static class BreakAttr extends RuntimeException {
439 static final long serialVersionUID = -6924771130405446405L;
440 private transient Env<AttrContext> env;
441 private BreakAttr(Env<AttrContext> env) {
442 this.env = env;
443 }
444 }
445
446 /**
447 * Mode controlling behavior of Attr.Check
448 */
449 enum CheckMode {
450
451 NORMAL,
452
453 /**
454 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
455 * that the captured var cache in {@code InferenceContext} will be used in read-only
456 * mode when performing inference checks.
457 */
458 NO_TREE_UPDATE {
459 @Override
460 public boolean updateTreeType() {
461 return false;
462 }
463 },
464 /**
465 * Mode signalling that caller will manage free types in tree decorations.
466 */
467 NO_INFERENCE_HOOK {
468 @Override
469 public boolean installPostInferenceHook() {
470 return false;
471 }
472 };
473
474 public boolean updateTreeType() {
475 return true;
476 }
477 public boolean installPostInferenceHook() {
478 return true;
479 }
480 }
481
482
483 class ResultInfo {
484 final KindSelector pkind;
485 final Type pt;
486 final CheckContext checkContext;
487 final CheckMode checkMode;
488
489 ResultInfo(KindSelector pkind, Type pt) {
490 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
491 }
492
493 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
494 this(pkind, pt, chk.basicHandler, checkMode);
495 }
496
497 protected ResultInfo(KindSelector pkind,
498 Type pt, CheckContext checkContext) {
499 this(pkind, pt, checkContext, CheckMode.NORMAL);
500 }
501
502 protected ResultInfo(KindSelector pkind,
503 Type pt, CheckContext checkContext, CheckMode checkMode) {
504 this.pkind = pkind;
505 this.pt = pt;
506 this.checkContext = checkContext;
507 this.checkMode = checkMode;
508 }
509
510 /**
511 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
512 * @param tree The tree to be type-checked.
513 * @return true if {@code ArgumentAttr} should be used.
514 */
515 protected boolean needsArgumentAttr(JCTree tree) { return false; }
516
517 protected Type check(final DiagnosticPosition pos, final Type found) {
518 return chk.checkType(pos, found, pt, checkContext);
519 }
520
521 protected ResultInfo dup(Type newPt) {
522 return new ResultInfo(pkind, newPt, checkContext, checkMode);
523 }
524
525 protected ResultInfo dup(CheckContext newContext) {
526 return new ResultInfo(pkind, pt, newContext, checkMode);
527 }
528
529 protected ResultInfo dup(Type newPt, CheckContext newContext) {
530 return new ResultInfo(pkind, newPt, newContext, checkMode);
531 }
532
533 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
534 return new ResultInfo(pkind, newPt, newContext, newMode);
535 }
536
537 protected ResultInfo dup(CheckMode newMode) {
538 return new ResultInfo(pkind, pt, checkContext, newMode);
539 }
540
541 @Override
542 public String toString() {
543 if (pt != null) {
544 return pt.toString();
545 } else {
546 return "";
547 }
548 }
549 }
550
551 class MethodAttrInfo extends ResultInfo {
552 public MethodAttrInfo() {
553 this(chk.basicHandler);
554 }
555
556 public MethodAttrInfo(CheckContext checkContext) {
557 super(KindSelector.VAL, Infer.anyPoly, checkContext);
558 }
559
560 @Override
561 protected boolean needsArgumentAttr(JCTree tree) {
562 return true;
563 }
564
565 protected ResultInfo dup(Type newPt) {
566 throw new IllegalStateException();
567 }
568
569 protected ResultInfo dup(CheckContext newContext) {
570 return new MethodAttrInfo(newContext);
571 }
572
573 protected ResultInfo dup(Type newPt, CheckContext newContext) {
574 throw new IllegalStateException();
575 }
576
577 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
578 throw new IllegalStateException();
579 }
580
581 protected ResultInfo dup(CheckMode newMode) {
582 throw new IllegalStateException();
583 }
584 }
585
586 class RecoveryInfo extends ResultInfo {
587
588 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
589 this(deferredAttrContext, Type.recoveryType);
590 }
591
592 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
593 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
594 @Override
595 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
596 return deferredAttrContext;
597 }
598 @Override
599 public boolean compatible(Type found, Type req, Warner warn) {
600 return true;
601 }
602 @Override
603 public void report(DiagnosticPosition pos, JCDiagnostic details) {
604 boolean needsReport = pt == Type.recoveryType ||
605 (details.getDiagnosticPosition() != null &&
606 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
607 if (needsReport) {
608 chk.basicHandler.report(pos, details);
609 }
610 }
611 });
612 }
613 }
614
615 final ResultInfo statInfo;
616 final ResultInfo varAssignmentInfo;
617 final ResultInfo methodAttrInfo;
618 final ResultInfo unknownExprInfo;
619 final ResultInfo unknownTypeInfo;
620 final ResultInfo unknownTypeExprInfo;
621 final ResultInfo recoveryInfo;
622 final MethodType initBlockType;
623
624 Type pt() {
625 return resultInfo.pt;
626 }
627
628 KindSelector pkind() {
629 return resultInfo.pkind;
630 }
631
632 /* ************************************************************************
633 * Visitor methods
634 *************************************************************************/
635
636 /** Visitor argument: the current environment.
637 */
638 Env<AttrContext> env;
639
640 /** Visitor argument: the currently expected attribution result.
641 */
642 ResultInfo resultInfo;
643
644 /** Visitor result: the computed type.
645 */
646 Type result;
647
648 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
649
650 /** Visitor method: attribute a tree, catching any completion failure
651 * exceptions. Return the tree's type.
652 *
653 * @param tree The tree to be visited.
654 * @param env The environment visitor argument.
655 * @param resultInfo The result info visitor argument.
656 */
657 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
658 Env<AttrContext> prevEnv = this.env;
659 ResultInfo prevResult = this.resultInfo;
660 try {
661 this.env = env;
662 this.resultInfo = resultInfo;
663 if (resultInfo.needsArgumentAttr(tree)) {
664 result = argumentAttr.attribArg(tree, env);
665 } else {
666 tree.accept(this);
667 }
668 matchBindings = matchBindingsComputer.finishBindings(tree,
669 matchBindings);
670 if (tree == breakTree &&
671 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
672 breakTreeFound(copyEnv(env));
673 }
674 return result;
675 } catch (CompletionFailure ex) {
676 tree.type = syms.errType;
677 return chk.completionError(tree.pos(), ex);
678 } finally {
679 this.env = prevEnv;
680 this.resultInfo = prevResult;
681 }
682 }
683
684 protected void breakTreeFound(Env<AttrContext> env) {
685 throw new BreakAttr(env);
686 }
687
688 Env<AttrContext> copyEnv(Env<AttrContext> env) {
689 Env<AttrContext> newEnv =
690 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
691 if (newEnv.outer != null) {
692 newEnv.outer = copyEnv(newEnv.outer);
693 }
694 return newEnv;
695 }
696
697 WriteableScope copyScope(WriteableScope sc) {
698 WriteableScope newScope = WriteableScope.create(sc.owner);
699 List<Symbol> elemsList = List.nil();
700 for (Symbol sym : sc.getSymbols()) {
701 elemsList = elemsList.prepend(sym);
702 }
703 for (Symbol s : elemsList) {
704 newScope.enter(s);
705 }
706 return newScope;
707 }
708
709 /** Derived visitor method: attribute an expression tree.
710 */
711 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
712 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
713 }
714
715 /** Derived visitor method: attribute an expression tree with
716 * no constraints on the computed type.
717 */
718 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
719 return attribTree(tree, env, unknownExprInfo);
720 }
721
722 /** Derived visitor method: attribute a type tree.
723 */
724 public Type attribType(JCTree tree, Env<AttrContext> env) {
725 Type result = attribType(tree, env, Type.noType);
726 return result;
727 }
728
729 /** Derived visitor method: attribute a type tree.
730 */
731 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
732 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
733 return result;
734 }
735
736 /** Derived visitor method: attribute a statement or definition tree.
737 */
738 public Type attribStat(JCTree tree, Env<AttrContext> env) {
739 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
740 Type result = attribTree(tree, env, statInfo);
741 analyzer.analyzeIfNeeded(tree, analyzeEnv);
742 attrRecover.doRecovery();
743 return result;
744 }
745
746 /** Attribute a list of expressions, returning a list of types.
747 */
748 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
749 ListBuffer<Type> ts = new ListBuffer<>();
750 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
751 ts.append(attribExpr(l.head, env, pt));
752 return ts.toList();
753 }
754
755 /** Attribute a list of statements, returning nothing.
756 */
757 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
758 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
759 attribStat(l.head, env);
760 }
761
762 /** Attribute the arguments in a method call, returning the method kind.
763 */
764 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
765 KindSelector kind = initialKind;
766 for (JCExpression arg : trees) {
767 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
768 if (argtype.hasTag(DEFERRED)) {
769 kind = KindSelector.of(KindSelector.POLY, kind);
770 }
771 argtypes.append(argtype);
772 }
773 return kind;
774 }
775
776 /** Attribute a type argument list, returning a list of types.
777 * Caller is responsible for calling checkRefTypes.
778 */
779 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
780 ListBuffer<Type> argtypes = new ListBuffer<>();
781 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
782 argtypes.append(attribType(l.head, env));
783 return argtypes.toList();
784 }
785
786 /** Attribute a type argument list, returning a list of types.
787 * Check that all the types are references.
788 */
789 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
790 List<Type> types = attribAnyTypes(trees, env);
791 return chk.checkRefTypes(trees, types);
792 }
793
794 /**
795 * Attribute type variables (of generic classes or methods).
796 * Compound types are attributed later in attribBounds.
797 * @param typarams the type variables to enter
798 * @param env the current environment
799 */
800 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
801 for (JCTypeParameter tvar : typarams) {
802 TypeVar a = (TypeVar)tvar.type;
803 a.tsym.flags_field |= UNATTRIBUTED;
804 a.setUpperBound(Type.noType);
805 if (!tvar.bounds.isEmpty()) {
806 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
807 for (JCExpression bound : tvar.bounds.tail)
808 bounds = bounds.prepend(attribType(bound, env));
809 types.setBounds(a, bounds.reverse());
810 } else {
811 // if no bounds are given, assume a single bound of
812 // java.lang.Object.
813 types.setBounds(a, List.of(syms.objectType));
814 }
815 a.tsym.flags_field &= ~UNATTRIBUTED;
816 }
817 if (checkCyclic) {
818 for (JCTypeParameter tvar : typarams) {
819 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
820 }
821 }
822 }
823
824 /**
825 * Attribute the type references in a list of annotations.
826 */
827 void attribAnnotationTypes(List<JCAnnotation> annotations,
828 Env<AttrContext> env) {
829 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
830 JCAnnotation a = al.head;
831 attribType(a.annotationType, env);
832 }
833 }
834
835 /**
836 * Attribute a "lazy constant value".
837 * @param env The env for the const value
838 * @param variable The initializer for the const value
839 * @param type The expected type, or null
840 * @see VarSymbol#setLazyConstValue
841 */
842 public Object attribLazyConstantValue(Env<AttrContext> env,
843 Env<AttrContext> enclosingEnv,
844 JCVariableDecl variable,
845 Type type) {
846 deferredLintHandler.push(variable);
847 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
848 try {
849 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
850 Type itype = attribExpr(variable.init, env, type);
851 if (variable.isImplicitlyTyped()) {
852 //fixup local variable type
853 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
854 }
855 if (itype.constValue() != null) {
856 return coerce(itype, type).constValue();
857 } else {
858 return null;
859 }
860 } finally {
861 log.useSource(prevSource);
862 deferredLintHandler.pop();
863 }
864 }
865
866 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
867 * Supertypes of anonymous inner classes are usually already attributed.
868 *
869 * @param tree The tree making up the type reference.
870 * @param env The environment current at the reference.
871 * @param classExpected true if only a class is expected here.
872 * @param interfaceExpected true if only an interface is expected here.
873 */
874 Type attribBase(JCTree tree,
875 Env<AttrContext> env,
876 boolean classExpected,
877 boolean interfaceExpected,
878 boolean checkExtensible) {
879 Type t = tree.type != null ?
880 tree.type :
881 attribType(tree, env);
882 try {
883 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
884 } catch (CompletionFailure ex) {
885 chk.completionError(tree.pos(), ex);
886 return t;
887 }
888 }
889 Type checkBase(Type t,
890 JCTree tree,
891 Env<AttrContext> env,
892 boolean classExpected,
893 boolean interfaceExpected,
894 boolean checkExtensible) {
895 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
896 (((JCTypeApply) tree).clazz).pos() : tree.pos();
897 if (t.tsym.isAnonymous()) {
898 log.error(pos, Errors.CantInheritFromAnon);
899 return types.createErrorType(t);
900 }
901 if (t.isErroneous())
902 return t;
903 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
904 // check that type variable is already visible
905 if (t.getUpperBound() == null) {
906 log.error(pos, Errors.IllegalForwardRef);
907 return types.createErrorType(t);
908 }
909 } else {
910 t = chk.checkClassType(pos, t, checkExtensible);
911 }
912 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
913 log.error(pos, Errors.IntfExpectedHere);
914 // return errType is necessary since otherwise there might
915 // be undetected cycles which cause attribution to loop
916 return types.createErrorType(t);
917 } else if (checkExtensible &&
918 classExpected &&
919 (t.tsym.flags() & INTERFACE) != 0) {
920 log.error(pos, Errors.NoIntfExpectedHere);
921 return types.createErrorType(t);
922 }
923 if (checkExtensible &&
924 ((t.tsym.flags() & FINAL) != 0)) {
925 log.error(pos,
926 Errors.CantInheritFromFinal(t.tsym));
927 }
928 chk.checkNonCyclic(pos, t);
929 return t;
930 }
931
932 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
933 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
934 id.type = env.info.scope.owner.enclClass().type;
935 id.sym = env.info.scope.owner.enclClass();
936 return id.type;
937 }
938
939 public void visitClassDef(JCClassDecl tree) {
940 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
941 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
942 argumentAttr.withLocalCacheContext() : null);
943 boolean ctorProloguePrev = env.info.ctorPrologue;
944 try {
945 // Local and anonymous classes have not been entered yet, so we need to
946 // do it now.
947 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
948 enter.classEnter(tree, env);
949 } else {
950 // If this class declaration is part of a class level annotation,
951 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
952 // order to simplify later steps and allow for sensible error
953 // messages.
954 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
955 enter.classEnter(tree, env);
956 }
957
958 ClassSymbol c = tree.sym;
959 if (c == null) {
960 // exit in case something drastic went wrong during enter.
961 result = null;
962 } else {
963 // make sure class has been completed:
964 c.complete();
965
966 // If a class declaration appears in a constructor prologue,
967 // that means it's either a local class or an anonymous class.
968 // Either way, there is no immediately enclosing instance.
969 if (ctorProloguePrev) {
970 c.flags_field |= NOOUTERTHIS;
971 }
972 attribClass(tree.pos(), c);
973 result = tree.type = c.type;
974 }
975 } finally {
976 localCacheContext.ifPresent(LocalCacheContext::leave);
977 env.info.ctorPrologue = ctorProloguePrev;
978 }
979 }
980
981 public void visitMethodDef(JCMethodDecl tree) {
982 MethodSymbol m = tree.sym;
983 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
984
985 Lint lint = env.info.lint.augment(m);
986 Lint prevLint = chk.setLint(lint);
987 boolean ctorProloguePrev = env.info.ctorPrologue;
988 Assert.check(!env.info.ctorPrologue);
989 MethodSymbol prevMethod = chk.setMethod(m);
990 try {
991 deferredLintHandler.flush(tree, lint);
992 chk.checkDeprecatedAnnotation(tree.pos(), m);
993
994
995 // Create a new environment with local scope
996 // for attributing the method.
997 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
998 localEnv.info.lint = lint;
999
1000 attribStats(tree.typarams, localEnv);
1001
1002 // If we override any other methods, check that we do so properly.
1003 // JLS ???
1004 if (m.isStatic()) {
1005 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1006 } else {
1007 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1008 }
1009 chk.checkOverride(env, tree, m);
1010
1011 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1012 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1013 }
1014
1015 // Enter all type parameters into the local method scope.
1016 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1017 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1018
1019 ClassSymbol owner = env.enclClass.sym;
1020 if ((owner.flags() & ANNOTATION) != 0 &&
1021 (tree.params.nonEmpty() ||
1022 tree.recvparam != null))
1023 log.error(tree.params.nonEmpty() ?
1024 tree.params.head.pos() :
1025 tree.recvparam.pos(),
1026 Errors.IntfAnnotationMembersCantHaveParams);
1027
1028 // Attribute all value parameters.
1029 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1030 attribStat(l.head, localEnv);
1031 }
1032
1033 chk.checkVarargsMethodDecl(localEnv, tree);
1034
1035 // Check that type parameters are well-formed.
1036 chk.validate(tree.typarams, localEnv);
1037
1038 // Check that result type is well-formed.
1039 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) {
1040 chk.validate(tree.restype, localEnv);
1041 }
1042 chk.checkRequiresIdentity(tree, env.info.lint);
1043
1044 // Check that receiver type is well-formed.
1045 if (tree.recvparam != null) {
1046 // Use a new environment to check the receiver parameter.
1047 // Otherwise I get "might not have been initialized" errors.
1048 // Is there a better way?
1049 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1050 attribType(tree.recvparam, newEnv);
1051 chk.validate(tree.recvparam, newEnv);
1052 }
1053
1054 // Is this method a constructor?
1055 boolean isConstructor = TreeInfo.isConstructor(tree);
1056
1057 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1058 // lets find if this method is an accessor
1059 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1060 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1061 if (recordComponent.isPresent()) {
1062 // the method is a user defined accessor lets check that everything is fine
1063 if (!tree.sym.isPublic()) {
1064 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1065 }
1066 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1067 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1068 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1069 }
1070 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1071 log.error(tree,
1072 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1073 }
1074 if (!tree.typarams.isEmpty()) {
1075 log.error(tree,
1076 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1077 }
1078 if (tree.sym.isStatic()) {
1079 log.error(tree,
1080 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1081 }
1082 }
1083
1084 if (isConstructor) {
1085 // if this a constructor other than the canonical one
1086 if ((tree.sym.flags_field & RECORD) == 0) {
1087 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1088 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1089 }
1090 } else {
1091 // but if it is the canonical:
1092
1093 /* if user generated, then it shouldn't:
1094 * - have an accessibility stricter than that of the record type
1095 * - explicitly invoke any other constructor
1096 */
1097 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1098 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1099 log.error(tree,
1100 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1101 Errors.InvalidCanonicalConstructorInRecord(
1102 Fragments.Canonical,
1103 env.enclClass.sym.name,
1104 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1105 ) :
1106 Errors.InvalidCanonicalConstructorInRecord(
1107 Fragments.Canonical,
1108 env.enclClass.sym.name,
1109 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1110 )
1111 );
1112 }
1113
1114 if (!allowValueClasses && TreeInfo.hasAnyConstructorCall(tree)) {
1115 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1116 Fragments.Canonical, env.enclClass.sym.name,
1117 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1118 }
1119 }
1120
1121 // also we want to check that no type variables have been defined
1122 if (!tree.typarams.isEmpty()) {
1123 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1124 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1125 }
1126
1127 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1128 * record components
1129 */
1130 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1131 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1132 for (JCVariableDecl param: tree.params) {
1133 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1134 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1135 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1136 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1137 Fragments.Canonical, env.enclClass.sym.name,
1138 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1139 }
1140 recordComponents = recordComponents.tail;
1141 recordFieldTypes = recordFieldTypes.tail;
1142 }
1143 }
1144 }
1145 }
1146
1147 // annotation method checks
1148 if ((owner.flags() & ANNOTATION) != 0) {
1149 // annotation method cannot have throws clause
1150 if (tree.thrown.nonEmpty()) {
1151 log.error(tree.thrown.head.pos(),
1152 Errors.ThrowsNotAllowedInIntfAnnotation);
1153 }
1154 // annotation method cannot declare type-parameters
1155 if (tree.typarams.nonEmpty()) {
1156 log.error(tree.typarams.head.pos(),
1157 Errors.IntfAnnotationMembersCantHaveTypeParams);
1158 }
1159 // validate annotation method's return type (could be an annotation type)
1160 chk.validateAnnotationType(tree.restype);
1161 // ensure that annotation method does not clash with members of Object/Annotation
1162 chk.validateAnnotationMethod(tree.pos(), m);
1163 }
1164
1165 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1166 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1167
1168 if (tree.body == null) {
1169 // Empty bodies are only allowed for
1170 // abstract, native, or interface methods, or for methods
1171 // in a retrofit signature class.
1172 if (tree.defaultValue != null) {
1173 if ((owner.flags() & ANNOTATION) == 0)
1174 log.error(tree.pos(),
1175 Errors.DefaultAllowedInIntfAnnotationMember);
1176 }
1177 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1178 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1179 } else {
1180 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1181 if ((owner.flags() & INTERFACE) != 0) {
1182 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1183 } else {
1184 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1185 }
1186 } else if ((tree.mods.flags & NATIVE) != 0) {
1187 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1188 }
1189 // Add an implicit super() call unless an explicit call to
1190 // super(...) or this(...) is given
1191 // or we are compiling class java.lang.Object.
1192 if (isConstructor && owner.type != syms.objectType) {
1193 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1194 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1195 make.Ident(names._super), make.Idents(List.nil())));
1196 if (allowValueClasses && (owner.isValueClass() || owner.hasStrict() || ((owner.flags_field & RECORD) != 0))) {
1197 tree.body.stats = tree.body.stats.append(supCall);
1198 } else {
1199 tree.body.stats = tree.body.stats.prepend(supCall);
1200 }
1201 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1202 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1203 TreeInfo.hasConstructorCall(tree, names._super)) {
1204 // enum constructors are not allowed to call super
1205 // directly, so make sure there aren't any super calls
1206 // in enum constructors, except in the compiler
1207 // generated one.
1208 log.error(tree.body.stats.head.pos(),
1209 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1210 }
1211 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1212 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1213 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1214 if (!initParamNames.equals(recordComponentNames)) {
1215 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1216 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1217 }
1218 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1219 log.error(tree,
1220 Errors.InvalidCanonicalConstructorInRecord(
1221 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1222 env.enclClass.sym.name,
1223 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1224 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1225 }
1226 }
1227 }
1228
1229 // Attribute all type annotations in the body
1230 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1231 annotate.flush();
1232
1233 // Start of constructor prologue
1234 localEnv.info.ctorPrologue = isConstructor;
1235
1236 // Attribute method body.
1237 attribStat(tree.body, localEnv);
1238 if (isConstructor) {
1239 ListBuffer<JCTree> prologueCode = new ListBuffer<>();
1240 for (JCTree stat : tree.body.stats) {
1241 prologueCode.add(stat);
1242 /* gather all the stats in the body until a `super` or `this` constructor invocation is found,
1243 * including the constructor invocation, that way we don't need to worry in the visitor below if
1244 * if we are dealing or not with prologue code
1245 */
1246 if (stat instanceof JCExpressionStatement expStmt &&
1247 expStmt.expr instanceof JCMethodInvocation mi &&
1248 TreeInfo.isConstructorCall(mi)) {
1249 break;
1250 }
1251 }
1252 if (!prologueCode.isEmpty()) {
1253 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(localEnv);
1254 ctorPrologueVisitor.scan(prologueCode.toList());
1255 }
1256 }
1257 }
1258
1259 localEnv.info.scope.leave();
1260 result = tree.type = m.type;
1261 } finally {
1262 chk.setLint(prevLint);
1263 chk.setMethod(prevMethod);
1264 env.info.ctorPrologue = ctorProloguePrev;
1265 }
1266 }
1267
1268 class CtorPrologueVisitor extends TreeScanner {
1269 Env<AttrContext> localEnv;
1270 CtorPrologueVisitor(Env<AttrContext> localEnv) {
1271 this.localEnv = localEnv;
1272 }
1273
1274 boolean insideLambdaOrClassDef = false;
1275
1276 @Override
1277 public void visitLambda(JCLambda lambda) {
1278 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1279 try {
1280 insideLambdaOrClassDef = true;
1281 super.visitLambda(lambda);
1282 } finally {
1283 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1284 }
1285 }
1286
1287 @Override
1288 public void visitClassDef(JCClassDecl classDecl) {
1289 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1290 try {
1291 insideLambdaOrClassDef = true;
1292 super.visitClassDef(classDecl);
1293 } finally {
1294 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1295 }
1296 }
1297
1298 private void reportPrologueError(JCTree tree, Symbol sym) {
1299 preview.checkSourceLevel(tree, Feature.FLEXIBLE_CONSTRUCTORS);
1300 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1301 }
1302
1303 @Override
1304 public void visitApply(JCMethodInvocation tree) {
1305 super.visitApply(tree);
1306 Name name = TreeInfo.name(tree.meth);
1307 boolean isConstructorCall = name == names._this || name == names._super;
1308 Symbol msym = TreeInfo.symbolFor(tree.meth);
1309 // is this an instance method call or an illegal constructor invocation like: `this.super()`?
1310 if (msym != null && // for erroneous invocations msym can be null, ignore those
1311 (!isConstructorCall ||
1312 isConstructorCall && tree.meth.hasTag(SELECT))) {
1313 if (isEarlyReference(localEnv, tree.meth, msym))
1314 reportPrologueError(tree.meth, msym);
1315 }
1316 }
1317
1318 @Override
1319 public void visitIdent(JCIdent tree) {
1320 analyzeSymbol(tree);
1321 }
1322
1323 @Override
1324 public void visitSelect(JCFieldAccess tree) {
1325 SelectScanner ss = new SelectScanner();
1326 ss.scan(tree);
1327 if (ss.scanLater == null) {
1328 analyzeSymbol(tree);
1329 } else {
1330 boolean prevLhs = isInLHS;
1331 try {
1332 isInLHS = false;
1333 scan(ss.scanLater);
1334 } finally {
1335 isInLHS = prevLhs;
1336 }
1337 }
1338 }
1339
1340 @Override
1341 public void visitNewClass(JCNewClass tree) {
1342 super.visitNewClass(tree);
1343 checkNewClassAndMethRefs(tree, tree.type);
1344 }
1345
1346 @Override
1347 public void visitReference(JCMemberReference tree) {
1348 super.visitReference(tree);
1349 if (tree.getMode() == JCMemberReference.ReferenceMode.NEW) {
1350 checkNewClassAndMethRefs(tree, tree.expr.type);
1351 }
1352 }
1353
1354 void checkNewClassAndMethRefs(JCTree tree, Type t) {
1355 if (t.tsym.isEnclosedBy(localEnv.enclClass.sym) &&
1356 !t.tsym.isStatic() &&
1357 !t.tsym.isDirectlyOrIndirectlyLocal()) {
1358 reportPrologueError(tree, t.getEnclosingType().tsym);
1359 }
1360 }
1361
1362 /* if a symbol is in the LHS of an assignment expression we won't consider it as a candidate
1363 * for a proxy local variable later on
1364 */
1365 boolean isInLHS = false;
1366
1367 @Override
1368 public void visitAssign(JCAssign tree) {
1369 boolean previousIsInLHS = isInLHS;
1370 try {
1371 isInLHS = true;
1372 scan(tree.lhs);
1373 } finally {
1374 isInLHS = previousIsInLHS;
1375 }
1376 scan(tree.rhs);
1377 }
1378
1379 @Override
1380 public void visitMethodDef(JCMethodDecl tree) {
1381 // ignore any declarative part, mainly to avoid scanning receiver parameters
1382 scan(tree.body);
1383 }
1384
1385 void analyzeSymbol(JCTree tree) {
1386 Symbol sym = TreeInfo.symbolFor(tree);
1387 if (isInLHS && !insideLambdaOrClassDef) {
1388 // Check instance field assignments that appear in constructor prologues
1389 if (isEarlyReference(localEnv, tree, sym)) {
1390 // Field may not be inherited from a superclass
1391 if (sym.owner != localEnv.enclClass.sym) {
1392 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1393 return;
1394 }
1395
1396 // Field may not have an initializer
1397 if ((sym.flags() & HASINIT) != 0) {
1398 log.error(tree, Errors.CantAssignInitializedBeforeCtorCalled(sym));
1399 return;
1400 }
1401 }
1402 return;
1403 }
1404 tree = TreeInfo.skipParens(tree);
1405 if (sym != null) {
1406 if (!sym.isStatic() && sym.kind == VAR && sym.owner.kind == TYP) {
1407 if (sym.name == names._this || sym.name == names._super) {
1408 // are we seeing something like `this` or `CurrentClass.this` or `SuperClass.super::foo`?
1409 if (TreeInfo.isExplicitThisReference(
1410 types,
1411 (ClassType)localEnv.enclClass.sym.type,
1412 tree)) {
1413 reportPrologueError(tree, sym);
1414 }
1415 } else if (sym.kind == VAR && sym.owner.kind == TYP) { // now fields only
1416 if (sym.owner != localEnv.enclClass.sym) {
1417 if (localEnv.enclClass.sym.isSubClass(sym.owner, types) &&
1418 sym.isInheritedIn(localEnv.enclClass.sym, types)) {
1419 /* if we are dealing with a field that doesn't belong to the current class, but the
1420 * field is inherited, this is an error. Unless, the super class is also an outer
1421 * class and the field's qualifier refers to the outer class
1422 */
1423 if (tree.hasTag(IDENT) ||
1424 TreeInfo.isExplicitThisReference(
1425 types,
1426 (ClassType)localEnv.enclClass.sym.type,
1427 ((JCFieldAccess)tree).selected)) {
1428 reportPrologueError(tree, sym);
1429 }
1430 }
1431 } else if (isEarlyReference(localEnv, tree, sym)) {
1432 /* now this is a `proper` instance field of the current class
1433 * references to fields of identity classes which happen to have initializers are
1434 * not allowed in the prologue
1435 */
1436 if (insideLambdaOrClassDef ||
1437 (!localEnv.enclClass.sym.isValueClass() && (sym.flags_field & HASINIT) != 0))
1438 reportPrologueError(tree, sym);
1439 // we will need to generate a proxy for this field later on
1440 if (!isInLHS) {
1441 if (allowValueClasses) {
1442 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, sym);
1443 } else {
1444 reportPrologueError(tree, sym);
1445 }
1446 }
1447 }
1448 }
1449 }
1450 }
1451 }
1452
1453 /**
1454 * Determine if the symbol appearance constitutes an early reference to the current class.
1455 *
1456 * <p>
1457 * This means the symbol is an instance field, or method, of the current class and it appears
1458 * in an early initialization context of it (i.e., one of its constructor prologues).
1459 *
1460 * @param env The current environment
1461 * @param tree the AST referencing the variable
1462 * @param sym The symbol
1463 */
1464 private boolean isEarlyReference(Env<AttrContext> env, JCTree tree, Symbol sym) {
1465 if ((sym.flags() & STATIC) == 0 &&
1466 (sym.kind == VAR || sym.kind == MTH) &&
1467 sym.isMemberOf(env.enclClass.sym, types)) {
1468 // Allow "Foo.this.x" when "Foo" is (also) an outer class, as this refers to the outer instance
1469 if (tree instanceof JCFieldAccess fa) {
1470 return TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, fa.selected);
1471 }
1472 return true;
1473 }
1474 return false;
1475 }
1476
1477 /* scanner for a select expression, anything that is not a select or identifier
1478 * will be stored for further analysis
1479 */
1480 class SelectScanner extends DeferredAttr.FilterScanner {
1481 JCTree scanLater;
1482
1483 SelectScanner() {
1484 super(Set.of(IDENT, SELECT, PARENS));
1485 }
1486
1487 @Override
1488 void skip(JCTree tree) {
1489 scanLater = tree;
1490 }
1491 }
1492 }
1493
1494 public void visitVarDef(JCVariableDecl tree) {
1495 // Local variables have not been entered yet, so we need to do it now:
1496 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1497 if (tree.sym != null) {
1498 // parameters have already been entered
1499 env.info.scope.enter(tree.sym);
1500 } else {
1501 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1502 if (tree.init == null) {
1503 //cannot use 'var' without initializer
1504 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1505 tree.vartype = make.Erroneous();
1506 } else {
1507 Fragment msg = canInferLocalVarType(tree);
1508 if (msg != null) {
1509 //cannot use 'var' with initializer which require an explicit target
1510 //(e.g. lambda, method reference, array initializer).
1511 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1512 tree.vartype = make.Erroneous();
1513 }
1514 }
1515 }
1516 try {
1517 annotate.blockAnnotations();
1518 memberEnter.memberEnter(tree, env);
1519 } finally {
1520 annotate.unblockAnnotations();
1521 }
1522 }
1523 } else {
1524 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1525 }
1526
1527 VarSymbol v = tree.sym;
1528 Lint lint = env.info.lint.augment(v);
1529 Lint prevLint = chk.setLint(lint);
1530
1531 // Check that the variable's declared type is well-formed.
1532 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1533 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1534 (tree.sym.flags() & PARAMETER) != 0;
1535 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1536
1537 try {
1538 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1539 deferredLintHandler.flush(tree, lint);
1540 chk.checkDeprecatedAnnotation(tree.pos(), v);
1541
1542 if (tree.init != null) {
1543 if ((v.flags_field & FINAL) == 0 ||
1544 !memberEnter.needsLazyConstValue(tree.init)) {
1545 // Not a compile-time constant
1546 // Attribute initializer in a new environment
1547 // with the declared variable as owner.
1548 // Check that initializer conforms to variable's declared type.
1549 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1550 initEnv.info.lint = lint;
1551 // In order to catch self-references, we set the variable's
1552 // declaration position to maximal possible value, effectively
1553 // marking the variable as undefined.
1554 initEnv.info.enclVar = v;
1555 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1556 try {
1557 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1558 // strict instance initializer in a value class
1559 initEnv.info.ctorPrologue = true;
1560 }
1561 attribExpr(tree.init, initEnv, v.type);
1562 if (tree.isImplicitlyTyped()) {
1563 //fixup local variable type
1564 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1565 }
1566 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1567 // strict field initializers are inlined in constructor's prologues
1568 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(initEnv);
1569 ctorPrologueVisitor.scan(tree.init);
1570 }
1571 } finally {
1572 initEnv.info.ctorPrologue = previousCtorPrologue;
1573 }
1574 }
1575 if (tree.isImplicitlyTyped()) {
1576 setSyntheticVariableType(tree, v.type);
1577 }
1578 }
1579 result = tree.type = v.type;
1580 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1581 if (isNonArgsMethodInObject(v.name)) {
1582 log.error(tree, Errors.IllegalRecordComponentName(v));
1583 }
1584 }
1585 chk.checkRequiresIdentity(tree, env.info.lint);
1586 }
1587 finally {
1588 chk.setLint(prevLint);
1589 }
1590 }
1591
1592 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1593 if (tree.init != null &&
1594 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1595 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1596 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1597 // Field initializer expression need to be entered.
1598 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree);
1599 annotate.flush();
1600 }
1601 }
1602
1603 private boolean isNonArgsMethodInObject(Name name) {
1604 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1605 if (s.type.getParameterTypes().isEmpty()) {
1606 return true;
1607 }
1608 }
1609 return false;
1610 }
1611
1612 Fragment canInferLocalVarType(JCVariableDecl tree) {
1613 LocalInitScanner lis = new LocalInitScanner();
1614 lis.scan(tree.init);
1615 return lis.badInferenceMsg;
1616 }
1617
1618 static class LocalInitScanner extends TreeScanner {
1619 Fragment badInferenceMsg = null;
1620 boolean needsTarget = true;
1621
1622 @Override
1623 public void visitNewArray(JCNewArray tree) {
1624 if (tree.elemtype == null && needsTarget) {
1625 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1626 }
1627 }
1628
1629 @Override
1630 public void visitLambda(JCLambda tree) {
1631 if (needsTarget) {
1632 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1633 }
1634 }
1635
1636 @Override
1637 public void visitTypeCast(JCTypeCast tree) {
1638 boolean prevNeedsTarget = needsTarget;
1639 try {
1640 needsTarget = false;
1641 super.visitTypeCast(tree);
1642 } finally {
1643 needsTarget = prevNeedsTarget;
1644 }
1645 }
1646
1647 @Override
1648 public void visitReference(JCMemberReference tree) {
1649 if (needsTarget) {
1650 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1651 }
1652 }
1653
1654 @Override
1655 public void visitNewClass(JCNewClass tree) {
1656 boolean prevNeedsTarget = needsTarget;
1657 try {
1658 needsTarget = false;
1659 super.visitNewClass(tree);
1660 } finally {
1661 needsTarget = prevNeedsTarget;
1662 }
1663 }
1664
1665 @Override
1666 public void visitApply(JCMethodInvocation tree) {
1667 boolean prevNeedsTarget = needsTarget;
1668 try {
1669 needsTarget = false;
1670 super.visitApply(tree);
1671 } finally {
1672 needsTarget = prevNeedsTarget;
1673 }
1674 }
1675 }
1676
1677 public void visitSkip(JCSkip tree) {
1678 result = null;
1679 }
1680
1681 public void visitBlock(JCBlock tree) {
1682 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1683 // Block is a static or instance initializer;
1684 // let the owner of the environment be a freshly
1685 // created BLOCK-method.
1686 Symbol fakeOwner =
1687 new MethodSymbol(tree.flags | BLOCK |
1688 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1689 env.info.scope.owner);
1690 final Env<AttrContext> localEnv =
1691 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1692
1693 if ((tree.flags & STATIC) != 0) {
1694 localEnv.info.staticLevel++;
1695 } else {
1696 localEnv.info.instanceInitializerBlock = true;
1697 }
1698 // Attribute all type annotations in the block
1699 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1700 annotate.flush();
1701 attribStats(tree.stats, localEnv);
1702
1703 {
1704 // Store init and clinit type annotations with the ClassSymbol
1705 // to allow output in Gen.normalizeDefs.
1706 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1707 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1708 if ((tree.flags & STATIC) != 0) {
1709 cs.appendClassInitTypeAttributes(tas);
1710 } else {
1711 cs.appendInitTypeAttributes(tas);
1712 }
1713 }
1714 } else {
1715 // Create a new local environment with a local scope.
1716 Env<AttrContext> localEnv =
1717 env.dup(tree, env.info.dup(env.info.scope.dup()));
1718 try {
1719 attribStats(tree.stats, localEnv);
1720 } finally {
1721 localEnv.info.scope.leave();
1722 }
1723 }
1724 result = null;
1725 }
1726
1727 public void visitDoLoop(JCDoWhileLoop tree) {
1728 attribStat(tree.body, env.dup(tree));
1729 attribExpr(tree.cond, env, syms.booleanType);
1730 handleLoopConditionBindings(matchBindings, tree, tree.body);
1731 result = null;
1732 }
1733
1734 public void visitWhileLoop(JCWhileLoop tree) {
1735 attribExpr(tree.cond, env, syms.booleanType);
1736 MatchBindings condBindings = matchBindings;
1737 // include condition's bindings when true in the body:
1738 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1739 try {
1740 attribStat(tree.body, whileEnv.dup(tree));
1741 } finally {
1742 whileEnv.info.scope.leave();
1743 }
1744 handleLoopConditionBindings(condBindings, tree, tree.body);
1745 result = null;
1746 }
1747
1748 public void visitForLoop(JCForLoop tree) {
1749 Env<AttrContext> loopEnv =
1750 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1751 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1752 try {
1753 attribStats(tree.init, loopEnv);
1754 if (tree.cond != null) {
1755 attribExpr(tree.cond, loopEnv, syms.booleanType);
1756 // include condition's bindings when true in the body and step:
1757 condBindings = matchBindings;
1758 }
1759 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1760 try {
1761 bodyEnv.tree = tree; // before, we were not in loop!
1762 attribStats(tree.step, bodyEnv);
1763 attribStat(tree.body, bodyEnv);
1764 } finally {
1765 bodyEnv.info.scope.leave();
1766 }
1767 result = null;
1768 }
1769 finally {
1770 loopEnv.info.scope.leave();
1771 }
1772 handleLoopConditionBindings(condBindings, tree, tree.body);
1773 }
1774
1775 /**
1776 * Include condition's bindings when false after the loop, if cannot get out of the loop
1777 */
1778 private void handleLoopConditionBindings(MatchBindings condBindings,
1779 JCStatement loop,
1780 JCStatement loopBody) {
1781 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1782 !breaksTo(env, loop, loopBody)) {
1783 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1784 }
1785 }
1786
1787 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1788 preFlow(body);
1789 return flow.breaksToTree(env, loop, body, make);
1790 }
1791
1792 /**
1793 * Add given bindings to the current scope, unless there's a break to
1794 * an immediately enclosing labeled statement.
1795 */
1796 private void addBindings2Scope(JCStatement introducingStatement,
1797 List<BindingSymbol> bindings) {
1798 if (bindings.isEmpty()) {
1799 return ;
1800 }
1801
1802 var searchEnv = env;
1803 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1804 labeled.body == introducingStatement) {
1805 if (breaksTo(env, labeled, labeled.body)) {
1806 //breaking to an immediately enclosing labeled statement
1807 return ;
1808 }
1809 searchEnv = searchEnv.next;
1810 introducingStatement = labeled;
1811 }
1812
1813 //include condition's body when false after the while, if cannot get out of the loop
1814 bindings.forEach(env.info.scope::enter);
1815 bindings.forEach(BindingSymbol::preserveBinding);
1816 }
1817
1818 public void visitForeachLoop(JCEnhancedForLoop tree) {
1819 Env<AttrContext> loopEnv =
1820 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1821 try {
1822 //the Formal Parameter of a for-each loop is not in the scope when
1823 //attributing the for-each expression; we mimic this by attributing
1824 //the for-each expression first (against original scope).
1825 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1826 chk.checkNonVoid(tree.pos(), exprType);
1827 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1828 if (elemtype == null) {
1829 // or perhaps expr implements Iterable<T>?
1830 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1831 if (base == null) {
1832 log.error(tree.expr.pos(),
1833 Errors.ForeachNotApplicableToType(exprType,
1834 Fragments.TypeReqArrayOrIterable));
1835 elemtype = types.createErrorType(exprType);
1836 } else {
1837 List<Type> iterableParams = base.allparams();
1838 elemtype = iterableParams.isEmpty()
1839 ? syms.objectType
1840 : types.wildUpperBound(iterableParams.head);
1841
1842 // Check the return type of the method iterator().
1843 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1844 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1845 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1846 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1847 log.error(tree.pos(),
1848 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1849 }
1850 }
1851 }
1852 if (tree.var.isImplicitlyTyped()) {
1853 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1854 setSyntheticVariableType(tree.var, inferredType);
1855 }
1856 attribStat(tree.var, loopEnv);
1857 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1858 loopEnv.tree = tree; // before, we were not in loop!
1859 attribStat(tree.body, loopEnv);
1860 result = null;
1861 }
1862 finally {
1863 loopEnv.info.scope.leave();
1864 }
1865 }
1866
1867 public void visitLabelled(JCLabeledStatement tree) {
1868 // Check that label is not used in an enclosing statement
1869 Env<AttrContext> env1 = env;
1870 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1871 if (env1.tree.hasTag(LABELLED) &&
1872 ((JCLabeledStatement) env1.tree).label == tree.label) {
1873 log.error(tree.pos(),
1874 Errors.LabelAlreadyInUse(tree.label));
1875 break;
1876 }
1877 env1 = env1.next;
1878 }
1879
1880 attribStat(tree.body, env.dup(tree));
1881 result = null;
1882 }
1883
1884 public void visitSwitch(JCSwitch tree) {
1885 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1886 attribStats(c.stats, caseEnv);
1887 });
1888 result = null;
1889 }
1890
1891 public void visitSwitchExpression(JCSwitchExpression tree) {
1892 boolean wrongContext = false;
1893
1894 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1895 PolyKind.STANDALONE : PolyKind.POLY;
1896
1897 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1898 //this means we are returning a poly conditional from void-compatible lambda expression
1899 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1900 resultInfo = recoveryInfo;
1901 wrongContext = true;
1902 }
1903
1904 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1905 unknownExprInfo :
1906 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1907
1908 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1909 ListBuffer<Type> caseTypes = new ListBuffer<>();
1910
1911 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1912 caseEnv.info.yieldResult = condInfo;
1913 attribStats(c.stats, caseEnv);
1914 new TreeScanner() {
1915 @Override
1916 public void visitYield(JCYield brk) {
1917 if (brk.target == tree) {
1918 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1919 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1920 }
1921 super.visitYield(brk);
1922 }
1923
1924 @Override public void visitClassDef(JCClassDecl tree) {}
1925 @Override public void visitLambda(JCLambda tree) {}
1926 }.scan(c.stats);
1927 });
1928
1929 if (tree.cases.isEmpty()) {
1930 log.error(tree.pos(),
1931 Errors.SwitchExpressionEmpty);
1932 } else if (caseTypes.isEmpty()) {
1933 log.error(tree.pos(),
1934 Errors.SwitchExpressionNoResultExpressions);
1935 }
1936
1937 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1938
1939 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1940 }
1941 //where:
1942 CheckContext switchExpressionContext(CheckContext checkContext) {
1943 return new Check.NestedCheckContext(checkContext) {
1944 //this will use enclosing check context to check compatibility of
1945 //subexpression against target type; if we are in a method check context,
1946 //depending on whether boxing is allowed, we could have incompatibilities
1947 @Override
1948 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1949 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1950 }
1951 };
1952 }
1953
1954 private void handleSwitch(JCTree switchTree,
1955 JCExpression selector,
1956 List<JCCase> cases,
1957 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1958 Type seltype = attribExpr(selector, env);
1959 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
1960
1961 Env<AttrContext> switchEnv =
1962 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1963
1964 try {
1965 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1966 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1967 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
1968 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1969 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1970 boolean patternSwitch;
1971 if (seltype.isPrimitive() && !intSwitch) {
1972 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1973 patternSwitch = true;
1974 }
1975 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1976 !intSwitch) {
1977 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1978 patternSwitch = true;
1979 } else {
1980 patternSwitch = cases.stream()
1981 .flatMap(c -> c.labels.stream())
1982 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1983 TreeInfo.isNullCaseLabel(l));
1984 }
1985
1986 // Attribute all cases and
1987 // check that there are no duplicate case labels or default clauses.
1988 Set<Object> constants = new HashSet<>(); // The set of case constants.
1989 boolean hasDefault = false; // Is there a default label?
1990 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1991 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1992 boolean hasNullPattern = false; // Is there a null pattern?
1993 CaseTree.CaseKind caseKind = null;
1994 boolean wasError = false;
1995 JCCaseLabel unconditionalCaseLabel = null;
1996 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1997 JCCase c = l.head;
1998 if (caseKind == null) {
1999 caseKind = c.caseKind;
2000 } else if (caseKind != c.caseKind && !wasError) {
2001 log.error(c.pos(),
2002 Errors.SwitchMixingCaseTypes);
2003 wasError = true;
2004 }
2005 MatchBindings currentBindings = null;
2006 MatchBindings guardBindings = null;
2007 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
2008 JCCaseLabel label = labels.head;
2009 if (label instanceof JCConstantCaseLabel constLabel) {
2010 JCExpression expr = constLabel.expr;
2011 if (TreeInfo.isNull(expr)) {
2012 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
2013 if (hasNullPattern) {
2014 log.error(label.pos(), Errors.DuplicateCaseLabel);
2015 }
2016 hasNullPattern = true;
2017 attribExpr(expr, switchEnv, seltype);
2018 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
2019 } else if (enumSwitch) {
2020 Symbol sym = enumConstant(expr, seltype);
2021 if (sym == null) {
2022 if (allowPatternSwitch) {
2023 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2024 Symbol enumSym = TreeInfo.symbol(expr);
2025 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
2026 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
2027 } else if (!constants.add(enumSym)) {
2028 log.error(label.pos(), Errors.DuplicateCaseLabel);
2029 }
2030 } else {
2031 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
2032 }
2033 } else if (!constants.add(sym)) {
2034 log.error(label.pos(), Errors.DuplicateCaseLabel);
2035 }
2036 } else if (errorEnumSwitch) {
2037 //error recovery: the selector is erroneous, and all the case labels
2038 //are identifiers. This could be an enum switch - don't report resolve
2039 //error for the case label:
2040 var prevResolveHelper = rs.basicLogResolveHelper;
2041 try {
2042 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
2043 attribExpr(expr, switchEnv, seltype);
2044 } finally {
2045 rs.basicLogResolveHelper = prevResolveHelper;
2046 }
2047 } else {
2048 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2049 if (!pattype.hasTag(ERROR)) {
2050 if (pattype.constValue() == null) {
2051 Symbol s = TreeInfo.symbol(expr);
2052 if (s != null && s.kind == TYP) {
2053 log.error(expr.pos(),
2054 Errors.PatternExpected);
2055 } else if (s == null || !s.isEnum()) {
2056 log.error(expr.pos(),
2057 (stringSwitch ? Errors.StringConstReq
2058 : intSwitch ? Errors.ConstExprReq
2059 : Errors.PatternOrEnumReq));
2060 } else if (!constants.add(s)) {
2061 log.error(label.pos(), Errors.DuplicateCaseLabel);
2062 }
2063 }
2064 else {
2065 boolean isLongFloatDoubleOrBooleanConstant =
2066 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
2067 if (isLongFloatDoubleOrBooleanConstant) {
2068 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
2069 }
2070 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
2071 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
2072 } else if (!constants.add(pattype.constValue())) {
2073 log.error(c.pos(), Errors.DuplicateCaseLabel);
2074 }
2075 }
2076 }
2077 }
2078 } else if (label instanceof JCDefaultCaseLabel def) {
2079 if (hasDefault) {
2080 log.error(label.pos(), Errors.DuplicateDefaultLabel);
2081 } else if (hasUnconditionalPattern) {
2082 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
2083 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2084 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
2085 }
2086 hasDefault = true;
2087 matchBindings = MatchBindingsComputer.EMPTY;
2088 } else if (label instanceof JCPatternCaseLabel patternlabel) {
2089 //pattern
2090 JCPattern pat = patternlabel.pat;
2091 attribExpr(pat, switchEnv, seltype);
2092 Type primaryType = TreeInfo.primaryPatternType(pat);
2093
2094 if (primaryType.isPrimitive()) {
2095 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
2096 } else if (!primaryType.hasTag(TYPEVAR)) {
2097 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
2098 }
2099 checkCastablePattern(pat.pos(), seltype, primaryType);
2100 Type patternType = types.erasure(primaryType);
2101 JCExpression guard = c.guard;
2102 if (guardBindings == null && guard != null) {
2103 MatchBindings afterPattern = matchBindings;
2104 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
2105 try {
2106 attribExpr(guard, bodyEnv, syms.booleanType);
2107 } finally {
2108 bodyEnv.info.scope.leave();
2109 }
2110
2111 guardBindings = matchBindings;
2112 matchBindings = afterPattern;
2113
2114 if (TreeInfo.isBooleanWithValue(guard, 0)) {
2115 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
2116 }
2117 }
2118 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
2119 boolean unconditional =
2120 unguarded &&
2121 !patternType.isErroneous() &&
2122 types.isUnconditionallyExact(seltype, patternType);
2123 if (unconditional) {
2124 if (hasUnconditionalPattern) {
2125 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
2126 } else if (hasDefault) {
2127 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
2128 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2129 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
2130 }
2131 hasUnconditionalPattern = true;
2132 unconditionalCaseLabel = label;
2133 }
2134 lastPatternErroneous = patternType.isErroneous();
2135 } else {
2136 Assert.error();
2137 }
2138 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
2139 }
2140
2141 if (guardBindings != null) {
2142 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
2143 }
2144
2145 Env<AttrContext> caseEnv =
2146 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
2147 try {
2148 attribCase.accept(c, caseEnv);
2149 } finally {
2150 caseEnv.info.scope.leave();
2151 }
2152 addVars(c.stats, switchEnv.info.scope);
2153
2154 preFlow(c);
2155 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
2156 }
2157 if (patternSwitch) {
2158 chk.checkSwitchCaseStructure(cases);
2159 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
2160 }
2161 if (switchTree.hasTag(SWITCH)) {
2162 ((JCSwitch) switchTree).hasUnconditionalPattern =
2163 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2164 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
2165 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
2166 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
2167 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2168 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
2169 } else {
2170 Assert.error(switchTree.getTag().name());
2171 }
2172 } finally {
2173 switchEnv.info.scope.leave();
2174 }
2175 }
2176 // where
2177 private ResultInfo caseLabelResultInfo(Type seltype) {
2178 return new ResultInfo(KindSelector.VAL_TYP,
2179 !seltype.hasTag(ERROR) ? seltype
2180 : Type.noType);
2181 }
2182 /** Add any variables defined in stats to the switch scope. */
2183 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
2184 for (;stats.nonEmpty(); stats = stats.tail) {
2185 JCTree stat = stats.head;
2186 if (stat.hasTag(VARDEF))
2187 switchScope.enter(((JCVariableDecl) stat).sym);
2188 }
2189 }
2190 // where
2191 /** Return the selected enumeration constant symbol, or null. */
2192 private Symbol enumConstant(JCTree tree, Type enumType) {
2193 if (tree.hasTag(IDENT)) {
2194 JCIdent ident = (JCIdent)tree;
2195 Name name = ident.name;
2196 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
2197 if (sym.kind == VAR) {
2198 Symbol s = ident.sym = sym;
2199 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
2200 ident.type = s.type;
2201 return ((s.flags_field & Flags.ENUM) == 0)
2202 ? null : s;
2203 }
2204 }
2205 }
2206 return null;
2207 }
2208
2209 public void visitSynchronized(JCSynchronized tree) {
2210 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
2211 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
2212 env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
2213 }
2214 attribStat(tree.body, env);
2215 result = null;
2216 }
2217
2218 public void visitTry(JCTry tree) {
2219 // Create a new local environment with a local
2220 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
2221 try {
2222 boolean isTryWithResource = tree.resources.nonEmpty();
2223 // Create a nested environment for attributing the try block if needed
2224 Env<AttrContext> tryEnv = isTryWithResource ?
2225 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2226 localEnv;
2227 try {
2228 // Attribute resource declarations
2229 for (JCTree resource : tree.resources) {
2230 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
2231 @Override
2232 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2233 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
2234 }
2235 };
2236 ResultInfo twrResult =
2237 new ResultInfo(KindSelector.VAR,
2238 syms.autoCloseableType,
2239 twrContext);
2240 if (resource.hasTag(VARDEF)) {
2241 attribStat(resource, tryEnv);
2242 twrResult.check(resource, resource.type);
2243
2244 //check that resource type cannot throw InterruptedException
2245 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2246
2247 VarSymbol var = ((JCVariableDecl) resource).sym;
2248
2249 var.flags_field |= Flags.FINAL;
2250 var.setData(ElementKind.RESOURCE_VARIABLE);
2251 } else {
2252 attribTree(resource, tryEnv, twrResult);
2253 }
2254 }
2255 // Attribute body
2256 attribStat(tree.body, tryEnv);
2257 } finally {
2258 if (isTryWithResource)
2259 tryEnv.info.scope.leave();
2260 }
2261
2262 // Attribute catch clauses
2263 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2264 JCCatch c = l.head;
2265 Env<AttrContext> catchEnv =
2266 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2267 try {
2268 Type ctype = attribStat(c.param, catchEnv);
2269 if (TreeInfo.isMultiCatch(c)) {
2270 //multi-catch parameter is implicitly marked as final
2271 c.param.sym.flags_field |= FINAL | UNION;
2272 }
2273 if (c.param.sym.kind == VAR) {
2274 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2275 }
2276 chk.checkType(c.param.vartype.pos(),
2277 chk.checkClassType(c.param.vartype.pos(), ctype),
2278 syms.throwableType);
2279 attribStat(c.body, catchEnv);
2280 } finally {
2281 catchEnv.info.scope.leave();
2282 }
2283 }
2284
2285 // Attribute finalizer
2286 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2287 result = null;
2288 }
2289 finally {
2290 localEnv.info.scope.leave();
2291 }
2292 }
2293
2294 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2295 if (!resource.isErroneous() &&
2296 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2297 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2298 Symbol close = syms.noSymbol;
2299 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2300 try {
2301 close = rs.resolveQualifiedMethod(pos,
2302 env,
2303 types.skipTypeVars(resource, false),
2304 names.close,
2305 List.nil(),
2306 List.nil());
2307 }
2308 finally {
2309 log.popDiagnosticHandler(discardHandler);
2310 }
2311 if (close.kind == MTH &&
2312 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2313 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2314 env.info.lint.logIfEnabled(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2315 }
2316 }
2317 }
2318
2319 public void visitConditional(JCConditional tree) {
2320 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2321 MatchBindings condBindings = matchBindings;
2322
2323 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2324 isBooleanOrNumeric(env, tree)) ?
2325 PolyKind.STANDALONE : PolyKind.POLY;
2326
2327 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2328 //this means we are returning a poly conditional from void-compatible lambda expression
2329 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2330 result = tree.type = types.createErrorType(resultInfo.pt);
2331 return;
2332 }
2333
2334 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2335 unknownExprInfo :
2336 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2337
2338
2339 // x ? y : z
2340 // include x's bindings when true in y
2341 // include x's bindings when false in z
2342
2343 Type truetype;
2344 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2345 try {
2346 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2347 } finally {
2348 trueEnv.info.scope.leave();
2349 }
2350
2351 MatchBindings trueBindings = matchBindings;
2352
2353 Type falsetype;
2354 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2355 try {
2356 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2357 } finally {
2358 falseEnv.info.scope.leave();
2359 }
2360
2361 MatchBindings falseBindings = matchBindings;
2362
2363 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2364 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2365 List.of(truetype, falsetype)) : pt();
2366 if (condtype.constValue() != null &&
2367 truetype.constValue() != null &&
2368 falsetype.constValue() != null &&
2369 !owntype.hasTag(NONE)) {
2370 //constant folding
2371 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2372 }
2373 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2374 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2375 }
2376 //where
2377 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2378 switch (tree.getTag()) {
2379 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2380 ((JCLiteral)tree).typetag == BOOLEAN ||
2381 ((JCLiteral)tree).typetag == BOT;
2382 case LAMBDA: case REFERENCE: return false;
2383 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2384 case CONDEXPR:
2385 JCConditional condTree = (JCConditional)tree;
2386 return isBooleanOrNumeric(env, condTree.truepart) &&
2387 isBooleanOrNumeric(env, condTree.falsepart);
2388 case APPLY:
2389 JCMethodInvocation speculativeMethodTree =
2390 (JCMethodInvocation)deferredAttr.attribSpeculative(
2391 tree, env, unknownExprInfo,
2392 argumentAttr.withLocalCacheContext());
2393 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2394 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2395 env.enclClass.type :
2396 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2397 Type owntype = types.memberType(receiverType, msym).getReturnType();
2398 return primitiveOrBoxed(owntype);
2399 case NEWCLASS:
2400 JCExpression className =
2401 removeClassParams.translate(((JCNewClass)tree).clazz);
2402 JCExpression speculativeNewClassTree =
2403 (JCExpression)deferredAttr.attribSpeculative(
2404 className, env, unknownTypeInfo,
2405 argumentAttr.withLocalCacheContext());
2406 return primitiveOrBoxed(speculativeNewClassTree.type);
2407 default:
2408 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2409 argumentAttr.withLocalCacheContext()).type;
2410 return primitiveOrBoxed(speculativeType);
2411 }
2412 }
2413 //where
2414 boolean primitiveOrBoxed(Type t) {
2415 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2416 }
2417
2418 TreeTranslator removeClassParams = new TreeTranslator() {
2419 @Override
2420 public void visitTypeApply(JCTypeApply tree) {
2421 result = translate(tree.clazz);
2422 }
2423 };
2424
2425 CheckContext conditionalContext(CheckContext checkContext) {
2426 return new Check.NestedCheckContext(checkContext) {
2427 //this will use enclosing check context to check compatibility of
2428 //subexpression against target type; if we are in a method check context,
2429 //depending on whether boxing is allowed, we could have incompatibilities
2430 @Override
2431 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2432 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2433 }
2434 };
2435 }
2436
2437 /** Compute the type of a conditional expression, after
2438 * checking that it exists. See JLS 15.25. Does not take into
2439 * account the special case where condition and both arms
2440 * are constants.
2441 *
2442 * @param pos The source position to be used for error
2443 * diagnostics.
2444 * @param thentype The type of the expression's then-part.
2445 * @param elsetype The type of the expression's else-part.
2446 */
2447 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2448 if (condTypes.isEmpty()) {
2449 return syms.objectType; //TODO: how to handle?
2450 }
2451 Type first = condTypes.head;
2452 // If same type, that is the result
2453 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2454 return first.baseType();
2455
2456 List<Type> unboxedTypes = condTypes.stream()
2457 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2458 .collect(List.collector());
2459
2460 // Otherwise, if both arms can be converted to a numeric
2461 // type, return the least numeric type that fits both arms
2462 // (i.e. return larger of the two, or return int if one
2463 // arm is short, the other is char).
2464 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2465 // If one arm has an integer subrange type (i.e., byte,
2466 // short, or char), and the other is an integer constant
2467 // that fits into the subrange, return the subrange type.
2468 for (Type type : unboxedTypes) {
2469 if (!type.getTag().isStrictSubRangeOf(INT)) {
2470 continue;
2471 }
2472 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2473 return type.baseType();
2474 }
2475
2476 for (TypeTag tag : primitiveTags) {
2477 Type candidate = syms.typeOfTag[tag.ordinal()];
2478 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2479 return candidate;
2480 }
2481 }
2482 }
2483
2484 // Those were all the cases that could result in a primitive
2485 condTypes = condTypes.stream()
2486 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2487 .collect(List.collector());
2488
2489 for (Type type : condTypes) {
2490 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2491 return type.baseType();
2492 }
2493
2494 Iterator<DiagnosticPosition> posIt = positions.iterator();
2495
2496 condTypes = condTypes.stream()
2497 .map(t -> chk.checkNonVoid(posIt.next(), t))
2498 .collect(List.collector());
2499
2500 // both are known to be reference types. The result is
2501 // lub(thentype,elsetype). This cannot fail, as it will
2502 // always be possible to infer "Object" if nothing better.
2503 return types.lub(condTypes.stream()
2504 .map(t -> t.baseType())
2505 .filter(t -> !t.hasTag(BOT))
2506 .collect(List.collector()));
2507 }
2508
2509 static final TypeTag[] primitiveTags = new TypeTag[]{
2510 BYTE,
2511 CHAR,
2512 SHORT,
2513 INT,
2514 LONG,
2515 FLOAT,
2516 DOUBLE,
2517 BOOLEAN,
2518 };
2519
2520 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2521 return bindingEnv(env, env.tree, bindings);
2522 }
2523
2524 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2525 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2526 bindings.forEach(env1.info.scope::enter);
2527 return env1;
2528 }
2529
2530 public void visitIf(JCIf tree) {
2531 attribExpr(tree.cond, env, syms.booleanType);
2532
2533 // if (x) { y } [ else z ]
2534 // include x's bindings when true in y
2535 // include x's bindings when false in z
2536
2537 MatchBindings condBindings = matchBindings;
2538 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2539
2540 try {
2541 attribStat(tree.thenpart, thenEnv);
2542 } finally {
2543 thenEnv.info.scope.leave();
2544 }
2545
2546 preFlow(tree.thenpart);
2547 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2548 boolean aliveAfterElse;
2549
2550 if (tree.elsepart != null) {
2551 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2552 try {
2553 attribStat(tree.elsepart, elseEnv);
2554 } finally {
2555 elseEnv.info.scope.leave();
2556 }
2557 preFlow(tree.elsepart);
2558 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2559 } else {
2560 aliveAfterElse = true;
2561 }
2562
2563 chk.checkEmptyIf(tree);
2564
2565 List<BindingSymbol> afterIfBindings = List.nil();
2566
2567 if (aliveAfterThen && !aliveAfterElse) {
2568 afterIfBindings = condBindings.bindingsWhenTrue;
2569 } else if (aliveAfterElse && !aliveAfterThen) {
2570 afterIfBindings = condBindings.bindingsWhenFalse;
2571 }
2572
2573 addBindings2Scope(tree, afterIfBindings);
2574
2575 result = null;
2576 }
2577
2578 void preFlow(JCTree tree) {
2579 attrRecover.doRecovery();
2580 new PostAttrAnalyzer() {
2581 @Override
2582 public void scan(JCTree tree) {
2583 if (tree == null ||
2584 (tree.type != null &&
2585 tree.type == Type.stuckType)) {
2586 //don't touch stuck expressions!
2587 return;
2588 }
2589 super.scan(tree);
2590 }
2591
2592 @Override
2593 public void visitClassDef(JCClassDecl that) {
2594 if (that.sym != null) {
2595 // Method preFlow shouldn't visit class definitions
2596 // that have not been entered and attributed.
2597 // See JDK-8254557 and JDK-8203277 for more details.
2598 super.visitClassDef(that);
2599 }
2600 }
2601
2602 @Override
2603 public void visitLambda(JCLambda that) {
2604 if (that.type != null) {
2605 // Method preFlow shouldn't visit lambda expressions
2606 // that have not been entered and attributed.
2607 // See JDK-8254557 and JDK-8203277 for more details.
2608 super.visitLambda(that);
2609 }
2610 }
2611 }.scan(tree);
2612 }
2613
2614 public void visitExec(JCExpressionStatement tree) {
2615 //a fresh environment is required for 292 inference to work properly ---
2616 //see Infer.instantiatePolymorphicSignatureInstance()
2617 Env<AttrContext> localEnv = env.dup(tree);
2618 attribExpr(tree.expr, localEnv);
2619 result = null;
2620 }
2621
2622 public void visitBreak(JCBreak tree) {
2623 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2624 result = null;
2625 }
2626
2627 public void visitYield(JCYield tree) {
2628 if (env.info.yieldResult != null) {
2629 attribTree(tree.value, env, env.info.yieldResult);
2630 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2631 } else {
2632 log.error(tree.pos(), tree.value.hasTag(PARENS)
2633 ? Errors.NoSwitchExpressionQualify
2634 : Errors.NoSwitchExpression);
2635 attribTree(tree.value, env, unknownExprInfo);
2636 }
2637 result = null;
2638 }
2639
2640 public void visitContinue(JCContinue tree) {
2641 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2642 result = null;
2643 }
2644 //where
2645 /** Return the target of a break, continue or yield statement,
2646 * if it exists, report an error if not.
2647 * Note: The target of a labelled break or continue is the
2648 * (non-labelled) statement tree referred to by the label,
2649 * not the tree representing the labelled statement itself.
2650 *
2651 * @param pos The position to be used for error diagnostics
2652 * @param tag The tag of the jump statement. This is either
2653 * Tree.BREAK or Tree.CONTINUE.
2654 * @param label The label of the jump statement, or null if no
2655 * label is given.
2656 * @param env The environment current at the jump statement.
2657 */
2658 private JCTree findJumpTarget(DiagnosticPosition pos,
2659 JCTree.Tag tag,
2660 Name label,
2661 Env<AttrContext> env) {
2662 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2663
2664 if (jumpTarget.snd != null) {
2665 log.error(pos, jumpTarget.snd);
2666 }
2667
2668 return jumpTarget.fst;
2669 }
2670 /** Return the target of a break or continue statement, if it exists,
2671 * report an error if not.
2672 * Note: The target of a labelled break or continue is the
2673 * (non-labelled) statement tree referred to by the label,
2674 * not the tree representing the labelled statement itself.
2675 *
2676 * @param tag The tag of the jump statement. This is either
2677 * Tree.BREAK or Tree.CONTINUE.
2678 * @param label The label of the jump statement, or null if no
2679 * label is given.
2680 * @param env The environment current at the jump statement.
2681 */
2682 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2683 Name label,
2684 Env<AttrContext> env) {
2685 // Search environments outwards from the point of jump.
2686 Env<AttrContext> env1 = env;
2687 JCDiagnostic.Error pendingError = null;
2688 LOOP:
2689 while (env1 != null) {
2690 switch (env1.tree.getTag()) {
2691 case LABELLED:
2692 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2693 if (label == labelled.label) {
2694 // If jump is a continue, check that target is a loop.
2695 if (tag == CONTINUE) {
2696 if (!labelled.body.hasTag(DOLOOP) &&
2697 !labelled.body.hasTag(WHILELOOP) &&
2698 !labelled.body.hasTag(FORLOOP) &&
2699 !labelled.body.hasTag(FOREACHLOOP)) {
2700 pendingError = Errors.NotLoopLabel(label);
2701 }
2702 // Found labelled statement target, now go inwards
2703 // to next non-labelled tree.
2704 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2705 } else {
2706 return Pair.of(labelled, pendingError);
2707 }
2708 }
2709 break;
2710 case DOLOOP:
2711 case WHILELOOP:
2712 case FORLOOP:
2713 case FOREACHLOOP:
2714 if (label == null) return Pair.of(env1.tree, pendingError);
2715 break;
2716 case SWITCH:
2717 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2718 break;
2719 case SWITCH_EXPRESSION:
2720 if (tag == YIELD) {
2721 return Pair.of(env1.tree, null);
2722 } else if (tag == BREAK) {
2723 pendingError = Errors.BreakOutsideSwitchExpression;
2724 } else {
2725 pendingError = Errors.ContinueOutsideSwitchExpression;
2726 }
2727 break;
2728 case LAMBDA:
2729 case METHODDEF:
2730 case CLASSDEF:
2731 break LOOP;
2732 default:
2733 }
2734 env1 = env1.next;
2735 }
2736 if (label != null)
2737 return Pair.of(null, Errors.UndefLabel(label));
2738 else if (pendingError != null)
2739 return Pair.of(null, pendingError);
2740 else if (tag == CONTINUE)
2741 return Pair.of(null, Errors.ContOutsideLoop);
2742 else
2743 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2744 }
2745
2746 public void visitReturn(JCReturn tree) {
2747 // Check that there is an enclosing method which is
2748 // nested within than the enclosing class.
2749 if (env.info.returnResult == null) {
2750 log.error(tree.pos(), Errors.RetOutsideMeth);
2751 } else if (env.info.yieldResult != null) {
2752 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2753 if (tree.expr != null) {
2754 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2755 }
2756 } else if (!env.info.isLambda &&
2757 env.enclMethod != null &&
2758 TreeInfo.isCompactConstructor(env.enclMethod)) {
2759 log.error(env.enclMethod,
2760 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2761 } else {
2762 // Attribute return expression, if it exists, and check that
2763 // it conforms to result type of enclosing method.
2764 if (tree.expr != null) {
2765 if (env.info.returnResult.pt.hasTag(VOID)) {
2766 env.info.returnResult.checkContext.report(tree.expr.pos(),
2767 diags.fragment(Fragments.UnexpectedRetVal));
2768 }
2769 attribTree(tree.expr, env, env.info.returnResult);
2770 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2771 !env.info.returnResult.pt.hasTag(NONE)) {
2772 env.info.returnResult.checkContext.report(tree.pos(),
2773 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2774 }
2775 }
2776 result = null;
2777 }
2778
2779 public void visitThrow(JCThrow tree) {
2780 Type owntype = attribExpr(tree.expr, env, Type.noType);
2781 chk.checkType(tree, owntype, syms.throwableType);
2782 result = null;
2783 }
2784
2785 public void visitAssert(JCAssert tree) {
2786 attribExpr(tree.cond, env, syms.booleanType);
2787 if (tree.detail != null) {
2788 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2789 }
2790 result = null;
2791 }
2792
2793 /** Visitor method for method invocations.
2794 * NOTE: The method part of an application will have in its type field
2795 * the return type of the method, not the method's type itself!
2796 */
2797 public void visitApply(JCMethodInvocation tree) {
2798 // The local environment of a method application is
2799 // a new environment nested in the current one.
2800 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2801
2802 // The types of the actual method arguments.
2803 List<Type> argtypes;
2804
2805 // The types of the actual method type arguments.
2806 List<Type> typeargtypes = null;
2807
2808 Name methName = TreeInfo.name(tree.meth);
2809
2810 boolean isConstructorCall =
2811 methName == names._this || methName == names._super;
2812
2813 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2814 if (isConstructorCall) {
2815
2816 // Attribute arguments, yielding list of argument types.
2817 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2818 argtypes = argtypesBuf.toList();
2819 typeargtypes = attribTypes(tree.typeargs, localEnv);
2820
2821 // Done with this()/super() parameters. End of constructor prologue.
2822 env.info.ctorPrologue = false;
2823
2824 // Variable `site' points to the class in which the called
2825 // constructor is defined.
2826 Type site = env.enclClass.sym.type;
2827 if (methName == names._super) {
2828 if (site == syms.objectType) {
2829 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2830 site = types.createErrorType(syms.objectType);
2831 } else {
2832 site = types.supertype(site);
2833 }
2834 }
2835
2836 if (site.hasTag(CLASS)) {
2837 Type encl = site.getEnclosingType();
2838 while (encl != null && encl.hasTag(TYPEVAR))
2839 encl = encl.getUpperBound();
2840 if (encl.hasTag(CLASS)) {
2841 // we are calling a nested class
2842
2843 if (tree.meth.hasTag(SELECT)) {
2844 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2845
2846 // We are seeing a prefixed call, of the form
2847 // <expr>.super(...).
2848 // Check that the prefix expression conforms
2849 // to the outer instance type of the class.
2850 chk.checkRefType(qualifier.pos(),
2851 attribExpr(qualifier, localEnv,
2852 encl));
2853 }
2854 } else if (tree.meth.hasTag(SELECT)) {
2855 log.error(tree.meth.pos(),
2856 Errors.IllegalQualNotIcls(site.tsym));
2857 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2858 }
2859
2860 if (tree.meth.hasTag(IDENT)) {
2861 // non-qualified super(...) call; check whether explicit constructor
2862 // invocation is well-formed. If the super class is an inner class,
2863 // make sure that an appropriate implicit qualifier exists. If the super
2864 // class is a local class, make sure that the current class is defined
2865 // in the same context as the local class.
2866 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2867 }
2868
2869 // if we're calling a java.lang.Enum constructor,
2870 // prefix the implicit String and int parameters
2871 if (site.tsym == syms.enumSym)
2872 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2873
2874 // Resolve the called constructor under the assumption
2875 // that we are referring to a superclass instance of the
2876 // current instance (JLS ???).
2877 boolean selectSuperPrev = localEnv.info.selectSuper;
2878 localEnv.info.selectSuper = true;
2879 localEnv.info.pendingResolutionPhase = null;
2880 Symbol sym = rs.resolveConstructor(
2881 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2882 localEnv.info.selectSuper = selectSuperPrev;
2883
2884 // Set method symbol to resolved constructor...
2885 TreeInfo.setSymbol(tree.meth, sym);
2886
2887 // ...and check that it is legal in the current context.
2888 // (this will also set the tree's type)
2889 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2890 checkId(tree.meth, site, sym, localEnv,
2891 new ResultInfo(kind, mpt));
2892 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2893 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2894 }
2895 // Otherwise, `site' is an error type and we do nothing
2896 result = tree.type = syms.voidType;
2897 } else {
2898 // Otherwise, we are seeing a regular method call.
2899 // Attribute the arguments, yielding list of argument types, ...
2900 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2901 argtypes = argtypesBuf.toList();
2902 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2903
2904 // ... and attribute the method using as a prototype a methodtype
2905 // whose formal argument types is exactly the list of actual
2906 // arguments (this will also set the method symbol).
2907 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2908 localEnv.info.pendingResolutionPhase = null;
2909 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2910
2911 // Compute the result type.
2912 Type restype = mtype.getReturnType();
2913 if (restype.hasTag(WILDCARD))
2914 throw new AssertionError(mtype);
2915
2916 Type qualifier = (tree.meth.hasTag(SELECT))
2917 ? ((JCFieldAccess) tree.meth).selected.type
2918 : env.enclClass.sym.type;
2919 Symbol msym = TreeInfo.symbol(tree.meth);
2920 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2921
2922 chk.checkRefTypes(tree.typeargs, typeargtypes);
2923
2924 // Check that value of resulting type is admissible in the
2925 // current context. Also, capture the return type
2926 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2927 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2928 }
2929 chk.checkRequiresIdentity(tree, env.info.lint);
2930 chk.validate(tree.typeargs, localEnv);
2931 }
2932 //where
2933 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2934 if (msym != null &&
2935 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2936 methodName == names.getClass &&
2937 argtypes.isEmpty()) {
2938 // as a special case, x.getClass() has type Class<? extends |X|>
2939 return new ClassType(restype.getEnclosingType(),
2940 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2941 BoundKind.EXTENDS,
2942 syms.boundClass)),
2943 restype.tsym,
2944 restype.getMetadata());
2945 } else if (msym != null &&
2946 msym.owner == syms.arrayClass &&
2947 methodName == names.clone &&
2948 types.isArray(qualifierType)) {
2949 // as a special case, array.clone() has a result that is
2950 // the same as static type of the array being cloned
2951 return qualifierType;
2952 } else {
2953 return restype;
2954 }
2955 }
2956
2957 /** Obtain a method type with given argument types.
2958 */
2959 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2960 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2961 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2962 }
2963
2964 public void visitNewClass(final JCNewClass tree) {
2965 Type owntype = types.createErrorType(tree.type);
2966
2967 // The local environment of a class creation is
2968 // a new environment nested in the current one.
2969 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2970
2971 // The anonymous inner class definition of the new expression,
2972 // if one is defined by it.
2973 JCClassDecl cdef = tree.def;
2974
2975 // If enclosing class is given, attribute it, and
2976 // complete class name to be fully qualified
2977 JCExpression clazz = tree.clazz; // Class field following new
2978 JCExpression clazzid; // Identifier in class field
2979 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2980 annoclazzid = null;
2981
2982 if (clazz.hasTag(TYPEAPPLY)) {
2983 clazzid = ((JCTypeApply) clazz).clazz;
2984 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2985 annoclazzid = (JCAnnotatedType) clazzid;
2986 clazzid = annoclazzid.underlyingType;
2987 }
2988 } else {
2989 if (clazz.hasTag(ANNOTATED_TYPE)) {
2990 annoclazzid = (JCAnnotatedType) clazz;
2991 clazzid = annoclazzid.underlyingType;
2992 } else {
2993 clazzid = clazz;
2994 }
2995 }
2996
2997 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2998
2999 if (tree.encl != null) {
3000 // We are seeing a qualified new, of the form
3001 // <expr>.new C <...> (...) ...
3002 // In this case, we let clazz stand for the name of the
3003 // allocated class C prefixed with the type of the qualifier
3004 // expression, so that we can
3005 // resolve it with standard techniques later. I.e., if
3006 // <expr> has type T, then <expr>.new C <...> (...)
3007 // yields a clazz T.C.
3008 Type encltype = chk.checkRefType(tree.encl.pos(),
3009 attribExpr(tree.encl, env));
3010 // TODO 308: in <expr>.new C, do we also want to add the type annotations
3011 // from expr to the combined type, or not? Yes, do this.
3012 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
3013 ((JCIdent) clazzid).name);
3014
3015 EndPosTable endPosTable = this.env.toplevel.endPositions;
3016 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
3017 if (clazz.hasTag(ANNOTATED_TYPE)) {
3018 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
3019 List<JCAnnotation> annos = annoType.annotations;
3020
3021 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
3022 clazzid1 = make.at(tree.pos).
3023 TypeApply(clazzid1,
3024 ((JCTypeApply) clazz).arguments);
3025 }
3026
3027 clazzid1 = make.at(tree.pos).
3028 AnnotatedType(annos, clazzid1);
3029 } else if (clazz.hasTag(TYPEAPPLY)) {
3030 clazzid1 = make.at(tree.pos).
3031 TypeApply(clazzid1,
3032 ((JCTypeApply) clazz).arguments);
3033 }
3034
3035 clazz = clazzid1;
3036 }
3037
3038 // Attribute clazz expression and store
3039 // symbol + type back into the attributed tree.
3040 Type clazztype;
3041
3042 try {
3043 env.info.isAnonymousNewClass = tree.def != null;
3044 clazztype = TreeInfo.isEnumInit(env.tree) ?
3045 attribIdentAsEnumType(env, (JCIdent)clazz) :
3046 attribType(clazz, env);
3047 } finally {
3048 env.info.isAnonymousNewClass = false;
3049 }
3050
3051 clazztype = chk.checkDiamond(tree, clazztype);
3052 chk.validate(clazz, localEnv);
3053 if (tree.encl != null) {
3054 // We have to work in this case to store
3055 // symbol + type back into the attributed tree.
3056 tree.clazz.type = clazztype;
3057 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
3058 clazzid.type = ((JCIdent) clazzid).sym.type;
3059 if (annoclazzid != null) {
3060 annoclazzid.type = clazzid.type;
3061 }
3062 if (!clazztype.isErroneous()) {
3063 if (cdef != null && clazztype.tsym.isInterface()) {
3064 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
3065 } else if (clazztype.tsym.isStatic()) {
3066 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
3067 }
3068 }
3069 } else {
3070 // Check for the existence of an apropos outer instance
3071 checkNewInnerClass(tree.pos(), env, clazztype, false);
3072 }
3073
3074 // Attribute constructor arguments.
3075 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
3076 final KindSelector pkind =
3077 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
3078 List<Type> argtypes = argtypesBuf.toList();
3079 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
3080
3081 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
3082 // Enums may not be instantiated except implicitly
3083 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
3084 (!env.tree.hasTag(VARDEF) ||
3085 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
3086 ((JCVariableDecl) env.tree).init != tree))
3087 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
3088
3089 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
3090 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3091 boolean skipNonDiamondPath = false;
3092 // Check that class is not abstract
3093 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
3094 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
3095 log.error(tree.pos(),
3096 Errors.AbstractCantBeInstantiated(clazztype.tsym));
3097 skipNonDiamondPath = true;
3098 } else if (cdef != null && clazztype.tsym.isInterface()) {
3099 // Check that no constructor arguments are given to
3100 // anonymous classes implementing an interface
3101 if (!argtypes.isEmpty())
3102 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
3103
3104 if (!typeargtypes.isEmpty())
3105 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
3106
3107 // Error recovery: pretend no arguments were supplied.
3108 argtypes = List.nil();
3109 typeargtypes = List.nil();
3110 skipNonDiamondPath = true;
3111 }
3112 if (TreeInfo.isDiamond(tree)) {
3113 ClassType site = new ClassType(clazztype.getEnclosingType(),
3114 clazztype.tsym.type.getTypeArguments(),
3115 clazztype.tsym,
3116 clazztype.getMetadata());
3117
3118 Env<AttrContext> diamondEnv = localEnv.dup(tree);
3119 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
3120 diamondEnv.info.pendingResolutionPhase = null;
3121
3122 //if the type of the instance creation expression is a class type
3123 //apply method resolution inference (JLS 15.12.2.7). The return type
3124 //of the resolved constructor will be a partially instantiated type
3125 Symbol constructor = rs.resolveDiamond(tree.pos(),
3126 diamondEnv,
3127 site,
3128 argtypes,
3129 typeargtypes);
3130 tree.constructor = constructor.baseSymbol();
3131
3132 final TypeSymbol csym = clazztype.tsym;
3133 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
3134 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3135 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
3136 constructorType = checkId(tree, site,
3137 constructor,
3138 diamondEnv,
3139 diamondResult);
3140
3141 tree.clazz.type = types.createErrorType(clazztype);
3142 if (!constructorType.isErroneous()) {
3143 tree.clazz.type = clazz.type = constructorType.getReturnType();
3144 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
3145 }
3146 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
3147 }
3148
3149 // Resolve the called constructor under the assumption
3150 // that we are referring to a superclass instance of the
3151 // current instance (JLS ???).
3152 else if (!skipNonDiamondPath) {
3153 //the following code alters some of the fields in the current
3154 //AttrContext - hence, the current context must be dup'ed in
3155 //order to avoid downstream failures
3156 Env<AttrContext> rsEnv = localEnv.dup(tree);
3157 rsEnv.info.selectSuper = cdef != null;
3158 rsEnv.info.pendingResolutionPhase = null;
3159 tree.constructor = rs.resolveConstructor(
3160 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
3161 if (cdef == null) { //do not check twice!
3162 tree.constructorType = checkId(tree,
3163 clazztype,
3164 tree.constructor,
3165 rsEnv,
3166 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3167 if (rsEnv.info.lastResolveVarargs())
3168 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
3169 }
3170 }
3171
3172 chk.checkRequiresIdentity(tree, env.info.lint);
3173
3174 if (cdef != null) {
3175 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
3176 return;
3177 }
3178
3179 if (tree.constructor != null && tree.constructor.kind == MTH)
3180 owntype = clazztype;
3181 }
3182 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3183 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3184 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
3185 //we need to wait for inference to finish and then replace inference vars in the constructor type
3186 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
3187 instantiatedContext -> {
3188 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3189 });
3190 }
3191 chk.validate(tree.typeargs, localEnv);
3192 }
3193
3194 // where
3195 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
3196 JCClassDecl cdef, Env<AttrContext> localEnv,
3197 List<Type> argtypes, List<Type> typeargtypes,
3198 KindSelector pkind) {
3199 // We are seeing an anonymous class instance creation.
3200 // In this case, the class instance creation
3201 // expression
3202 //
3203 // E.new <typeargs1>C<typargs2>(args) { ... }
3204 //
3205 // is represented internally as
3206 //
3207 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
3208 //
3209 // This expression is then *transformed* as follows:
3210 //
3211 // (1) add an extends or implements clause
3212 // (2) add a constructor.
3213 //
3214 // For instance, if C is a class, and ET is the type of E,
3215 // the expression
3216 //
3217 // E.new <typeargs1>C<typargs2>(args) { ... }
3218 //
3219 // is translated to (where X is a fresh name and typarams is the
3220 // parameter list of the super constructor):
3221 //
3222 // new <typeargs1>X(<*nullchk*>E, args) where
3223 // X extends C<typargs2> {
3224 // <typarams> X(ET e, args) {
3225 // e.<typeargs1>super(args)
3226 // }
3227 // ...
3228 // }
3229 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3230 Type enclType = clazztype.getEnclosingType();
3231 if (enclType != null &&
3232 enclType.hasTag(CLASS) &&
3233 !chk.checkDenotable((ClassType)enclType)) {
3234 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
3235 }
3236 final boolean isDiamond = TreeInfo.isDiamond(tree);
3237 if (isDiamond
3238 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3239 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3240 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3241 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3242 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3243 instantiatedContext -> {
3244 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3245 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3246 ResultInfo prevResult = this.resultInfo;
3247 try {
3248 this.resultInfo = resultInfoForClassDefinition;
3249 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3250 dupLocalEnv, argtypes, typeargtypes, pkind);
3251 } finally {
3252 this.resultInfo = prevResult;
3253 }
3254 });
3255 } else {
3256 if (isDiamond && clazztype.hasTag(CLASS)) {
3257 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3258 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3259 // One or more types inferred in the previous steps is non-denotable.
3260 Fragment fragment = Diamond(clazztype.tsym);
3261 log.error(tree.clazz.pos(),
3262 Errors.CantApplyDiamond1(
3263 fragment,
3264 invalidDiamondArgs.size() > 1 ?
3265 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3266 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3267 }
3268 // For <>(){}, inferred types must also be accessible.
3269 for (Type t : clazztype.getTypeArguments()) {
3270 rs.checkAccessibleType(env, t);
3271 }
3272 }
3273
3274 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3275 // false for isInterface call even when the original type is an interface.
3276 boolean implementing = clazztype.tsym.isInterface() ||
3277 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3278 clazztype.getOriginalType().tsym.isInterface();
3279
3280 if (implementing) {
3281 cdef.implementing = List.of(clazz);
3282 } else {
3283 cdef.extending = clazz;
3284 }
3285
3286 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3287 rs.isSerializable(clazztype)) {
3288 localEnv.info.isSerializable = true;
3289 }
3290
3291 attribStat(cdef, localEnv);
3292
3293 List<Type> finalargtypes;
3294 // If an outer instance is given,
3295 // prefix it to the constructor arguments
3296 // and delete it from the new expression
3297 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3298 finalargtypes = argtypes.prepend(tree.encl.type);
3299 } else {
3300 finalargtypes = argtypes;
3301 }
3302
3303 // Reassign clazztype and recompute constructor. As this necessarily involves
3304 // another attribution pass for deferred types in the case of <>, replicate
3305 // them. Original arguments have right decorations already.
3306 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3307 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3308 }
3309
3310 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3311 : cdef.sym.type;
3312 Symbol sym = tree.constructor = rs.resolveConstructor(
3313 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3314 Assert.check(!sym.kind.isResolutionError());
3315 tree.constructor = sym;
3316 tree.constructorType = checkId(tree,
3317 clazztype,
3318 tree.constructor,
3319 localEnv,
3320 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3321 }
3322 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3323 clazztype : types.createErrorType(tree.type);
3324 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3325 chk.validate(tree.typeargs, localEnv);
3326 }
3327
3328 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3329 return new Check.NestedCheckContext(checkContext) {
3330 @Override
3331 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3332 enclosingContext.report(clazz.clazz,
3333 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3334 }
3335 };
3336 }
3337
3338 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3339 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3340 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3341 (!isLocal && !type.tsym.isInner()) ||
3342 (isSuper && env.enclClass.sym.isAnonymous())) {
3343 // nothing to check
3344 return;
3345 }
3346 Symbol res = isLocal ?
3347 rs.findLocalClassOwner(env, type.tsym) :
3348 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3349 if (res.exists()) {
3350 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3351 } else {
3352 log.error(pos, Errors.EnclClassRequired(type.tsym));
3353 }
3354 }
3355
3356 /** Make an attributed null check tree.
3357 */
3358 public JCExpression makeNullCheck(JCExpression arg) {
3359 // optimization: new Outer() can never be null; skip null check
3360 if (arg.getTag() == NEWCLASS)
3361 return arg;
3362 // optimization: X.this is never null; skip null check
3363 Name name = TreeInfo.name(arg);
3364 if (name == names._this || name == names._super) return arg;
3365
3366 JCTree.Tag optag = NULLCHK;
3367 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3368 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3369 tree.type = arg.type;
3370 return tree;
3371 }
3372
3373 public void visitNewArray(JCNewArray tree) {
3374 Type owntype = types.createErrorType(tree.type);
3375 Env<AttrContext> localEnv = env.dup(tree);
3376 Type elemtype;
3377 if (tree.elemtype != null) {
3378 elemtype = attribType(tree.elemtype, localEnv);
3379 chk.validate(tree.elemtype, localEnv);
3380 owntype = elemtype;
3381 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3382 attribExpr(l.head, localEnv, syms.intType);
3383 owntype = new ArrayType(owntype, syms.arrayClass);
3384 }
3385 } else {
3386 // we are seeing an untyped aggregate { ... }
3387 // this is allowed only if the prototype is an array
3388 if (pt().hasTag(ARRAY)) {
3389 elemtype = types.elemtype(pt());
3390 } else {
3391 if (!pt().hasTag(ERROR) &&
3392 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3393 log.error(tree.pos(),
3394 Errors.IllegalInitializerForType(pt()));
3395 }
3396 elemtype = types.createErrorType(pt());
3397 }
3398 }
3399 if (tree.elems != null) {
3400 attribExprs(tree.elems, localEnv, elemtype);
3401 owntype = new ArrayType(elemtype, syms.arrayClass);
3402 }
3403 if (!types.isReifiable(elemtype))
3404 log.error(tree.pos(), Errors.GenericArrayCreation);
3405 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3406 }
3407
3408 /*
3409 * A lambda expression can only be attributed when a target-type is available.
3410 * In addition, if the target-type is that of a functional interface whose
3411 * descriptor contains inference variables in argument position the lambda expression
3412 * is 'stuck' (see DeferredAttr).
3413 */
3414 @Override
3415 public void visitLambda(final JCLambda that) {
3416 boolean wrongContext = false;
3417 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3418 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3419 //lambda only allowed in assignment or method invocation/cast context
3420 log.error(that.pos(), Errors.UnexpectedLambda);
3421 }
3422 resultInfo = recoveryInfo;
3423 wrongContext = true;
3424 }
3425 //create an environment for attribution of the lambda expression
3426 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3427 boolean needsRecovery =
3428 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3429 try {
3430 if (needsRecovery && rs.isSerializable(pt())) {
3431 localEnv.info.isSerializable = true;
3432 localEnv.info.isSerializableLambda = true;
3433 }
3434 List<Type> explicitParamTypes = null;
3435 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3436 //attribute lambda parameters
3437 attribStats(that.params, localEnv);
3438 explicitParamTypes = TreeInfo.types(that.params);
3439 }
3440
3441 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3442 Type currentTarget = targetInfo.target;
3443 Type lambdaType = targetInfo.descriptor;
3444
3445 if (currentTarget.isErroneous()) {
3446 result = that.type = currentTarget;
3447 return;
3448 }
3449
3450 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3451
3452 if (lambdaType.hasTag(FORALL)) {
3453 //lambda expression target desc cannot be a generic method
3454 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3455 kindName(currentTarget.tsym),
3456 currentTarget.tsym);
3457 resultInfo.checkContext.report(that, diags.fragment(msg));
3458 result = that.type = types.createErrorType(pt());
3459 return;
3460 }
3461
3462 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3463 //add param type info in the AST
3464 List<Type> actuals = lambdaType.getParameterTypes();
3465 List<JCVariableDecl> params = that.params;
3466
3467 boolean arityMismatch = false;
3468
3469 while (params.nonEmpty()) {
3470 if (actuals.isEmpty()) {
3471 //not enough actuals to perform lambda parameter inference
3472 arityMismatch = true;
3473 }
3474 //reset previously set info
3475 Type argType = arityMismatch ?
3476 syms.errType :
3477 actuals.head;
3478 if (params.head.isImplicitlyTyped()) {
3479 setSyntheticVariableType(params.head, argType);
3480 }
3481 params.head.sym = null;
3482 actuals = actuals.isEmpty() ?
3483 actuals :
3484 actuals.tail;
3485 params = params.tail;
3486 }
3487
3488 //attribute lambda parameters
3489 attribStats(that.params, localEnv);
3490
3491 if (arityMismatch) {
3492 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3493 result = that.type = types.createErrorType(currentTarget);
3494 return;
3495 }
3496 }
3497
3498 //from this point on, no recovery is needed; if we are in assignment context
3499 //we will be able to attribute the whole lambda body, regardless of errors;
3500 //if we are in a 'check' method context, and the lambda is not compatible
3501 //with the target-type, it will be recovered anyway in Attr.checkId
3502 needsRecovery = false;
3503
3504 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3505 lambdaBodyResult(that, lambdaType, resultInfo);
3506
3507 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3508 attribTree(that.getBody(), localEnv, bodyResultInfo);
3509 } else {
3510 JCBlock body = (JCBlock)that.body;
3511 if (body == breakTree &&
3512 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3513 breakTreeFound(copyEnv(localEnv));
3514 }
3515 attribStats(body.stats, localEnv);
3516 }
3517
3518 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3519
3520 boolean isSpeculativeRound =
3521 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3522
3523 preFlow(that);
3524 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3525
3526 that.type = currentTarget; //avoids recovery at this stage
3527 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3528
3529 if (!isSpeculativeRound) {
3530 //add thrown types as bounds to the thrown types free variables if needed:
3531 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3532 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3533 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3534 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3535 }
3536 }
3537
3538 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3539 }
3540 result = wrongContext ? that.type = types.createErrorType(pt())
3541 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3542 } catch (Types.FunctionDescriptorLookupError ex) {
3543 JCDiagnostic cause = ex.getDiagnostic();
3544 resultInfo.checkContext.report(that, cause);
3545 result = that.type = types.createErrorType(pt());
3546 return;
3547 } catch (CompletionFailure cf) {
3548 chk.completionError(that.pos(), cf);
3549 } catch (Throwable t) {
3550 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3551 //as that would likely cause the same exception again.
3552 needsRecovery = false;
3553 throw t;
3554 } finally {
3555 localEnv.info.scope.leave();
3556 if (needsRecovery) {
3557 Type prevResult = result;
3558 try {
3559 attribTree(that, env, recoveryInfo);
3560 } finally {
3561 if (result == Type.recoveryType) {
3562 result = prevResult;
3563 }
3564 }
3565 }
3566 }
3567 }
3568 //where
3569 class TargetInfo {
3570 Type target;
3571 Type descriptor;
3572
3573 public TargetInfo(Type target, Type descriptor) {
3574 this.target = target;
3575 this.descriptor = descriptor;
3576 }
3577 }
3578
3579 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3580 Type lambdaType;
3581 Type currentTarget = resultInfo.pt;
3582 if (resultInfo.pt != Type.recoveryType) {
3583 /* We need to adjust the target. If the target is an
3584 * intersection type, for example: SAM & I1 & I2 ...
3585 * the target will be updated to SAM
3586 */
3587 currentTarget = targetChecker.visit(currentTarget, that);
3588 if (!currentTarget.isIntersection()) {
3589 if (explicitParamTypes != null) {
3590 currentTarget = infer.instantiateFunctionalInterface(that,
3591 currentTarget, explicitParamTypes, resultInfo.checkContext);
3592 }
3593 currentTarget = types.removeWildcards(currentTarget);
3594 lambdaType = types.findDescriptorType(currentTarget);
3595 } else {
3596 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3597 ListBuffer<Type> components = new ListBuffer<>();
3598 for (Type bound : ict.getExplicitComponents()) {
3599 if (explicitParamTypes != null) {
3600 try {
3601 bound = infer.instantiateFunctionalInterface(that,
3602 bound, explicitParamTypes, resultInfo.checkContext);
3603 } catch (FunctionDescriptorLookupError t) {
3604 // do nothing
3605 }
3606 }
3607 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3608 // bound must be j.l.Object or an interface, but not an annotation
3609 reportIntersectionError(that, "not.an.intf.component", bound);
3610 }
3611 bound = types.removeWildcards(bound);
3612 components.add(bound);
3613 }
3614 currentTarget = types.makeIntersectionType(components.toList());
3615 currentTarget.tsym.flags_field |= INTERFACE;
3616 lambdaType = types.findDescriptorType(currentTarget);
3617 }
3618
3619 } else {
3620 currentTarget = Type.recoveryType;
3621 lambdaType = fallbackDescriptorType(that);
3622 }
3623 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3624 //lambda expression target desc cannot be a generic method
3625 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3626 kindName(currentTarget.tsym),
3627 currentTarget.tsym);
3628 resultInfo.checkContext.report(that, diags.fragment(msg));
3629 currentTarget = types.createErrorType(pt());
3630 }
3631 return new TargetInfo(currentTarget, lambdaType);
3632 }
3633
3634 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3635 resultInfo.checkContext.report(pos,
3636 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3637 }
3638
3639 void preFlow(JCLambda tree) {
3640 attrRecover.doRecovery();
3641 new PostAttrAnalyzer() {
3642 @Override
3643 public void scan(JCTree tree) {
3644 if (tree == null ||
3645 (tree.type != null &&
3646 tree.type == Type.stuckType)) {
3647 //don't touch stuck expressions!
3648 return;
3649 }
3650 super.scan(tree);
3651 }
3652
3653 @Override
3654 public void visitClassDef(JCClassDecl that) {
3655 // or class declaration trees!
3656 }
3657
3658 public void visitLambda(JCLambda that) {
3659 // or lambda expressions!
3660 }
3661 }.scan(tree.body);
3662 }
3663
3664 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3665
3666 @Override
3667 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3668 return t.isIntersection() ?
3669 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3670 }
3671
3672 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3673 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3674 return ict;
3675 }
3676
3677 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3678 ListBuffer<Type> targs = new ListBuffer<>();
3679 ListBuffer<Type> supertypes = new ListBuffer<>();
3680 for (Type i : ict.interfaces_field) {
3681 if (i.isParameterized()) {
3682 targs.appendList(i.tsym.type.allparams());
3683 }
3684 supertypes.append(i.tsym.type);
3685 }
3686 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3687 notionalIntf.allparams_field = targs.toList();
3688 notionalIntf.tsym.flags_field |= INTERFACE;
3689 return notionalIntf.tsym;
3690 }
3691 };
3692
3693 private Type fallbackDescriptorType(JCExpression tree) {
3694 switch (tree.getTag()) {
3695 case LAMBDA:
3696 JCLambda lambda = (JCLambda)tree;
3697 List<Type> argtypes = List.nil();
3698 for (JCVariableDecl param : lambda.params) {
3699 argtypes = param.vartype != null && param.vartype.type != null ?
3700 argtypes.append(param.vartype.type) :
3701 argtypes.append(syms.errType);
3702 }
3703 return new MethodType(argtypes, Type.recoveryType,
3704 List.of(syms.throwableType), syms.methodClass);
3705 case REFERENCE:
3706 return new MethodType(List.nil(), Type.recoveryType,
3707 List.of(syms.throwableType), syms.methodClass);
3708 default:
3709 Assert.error("Cannot get here!");
3710 }
3711 return null;
3712 }
3713
3714 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3715 final InferenceContext inferenceContext, final Type... ts) {
3716 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3717 }
3718
3719 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3720 final InferenceContext inferenceContext, final List<Type> ts) {
3721 if (inferenceContext.free(ts)) {
3722 inferenceContext.addFreeTypeListener(ts,
3723 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3724 } else {
3725 for (Type t : ts) {
3726 rs.checkAccessibleType(env, t);
3727 }
3728 }
3729 }
3730
3731 /**
3732 * Lambda/method reference have a special check context that ensures
3733 * that i.e. a lambda return type is compatible with the expected
3734 * type according to both the inherited context and the assignment
3735 * context.
3736 */
3737 class FunctionalReturnContext extends Check.NestedCheckContext {
3738
3739 FunctionalReturnContext(CheckContext enclosingContext) {
3740 super(enclosingContext);
3741 }
3742
3743 @Override
3744 public boolean compatible(Type found, Type req, Warner warn) {
3745 //return type must be compatible in both current context and assignment context
3746 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3747 }
3748
3749 @Override
3750 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3751 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3752 }
3753 }
3754
3755 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3756
3757 JCExpression expr;
3758 boolean expStmtExpected;
3759
3760 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3761 super(enclosingContext);
3762 this.expr = expr;
3763 }
3764
3765 @Override
3766 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3767 if (expStmtExpected) {
3768 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3769 } else {
3770 super.report(pos, details);
3771 }
3772 }
3773
3774 @Override
3775 public boolean compatible(Type found, Type req, Warner warn) {
3776 //a void return is compatible with an expression statement lambda
3777 if (req.hasTag(VOID)) {
3778 expStmtExpected = true;
3779 return TreeInfo.isExpressionStatement(expr);
3780 } else {
3781 return super.compatible(found, req, warn);
3782 }
3783 }
3784 }
3785
3786 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3787 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3788 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3789 new FunctionalReturnContext(resultInfo.checkContext);
3790
3791 return descriptor.getReturnType() == Type.recoveryType ?
3792 recoveryInfo :
3793 new ResultInfo(KindSelector.VAL,
3794 descriptor.getReturnType(), funcContext);
3795 }
3796
3797 /**
3798 * Lambda compatibility. Check that given return types, thrown types, parameter types
3799 * are compatible with the expected functional interface descriptor. This means that:
3800 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3801 * types must be compatible with the return type of the expected descriptor.
3802 */
3803 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3804 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3805
3806 //return values have already been checked - but if lambda has no return
3807 //values, we must ensure that void/value compatibility is correct;
3808 //this amounts at checking that, if a lambda body can complete normally,
3809 //the descriptor's return type must be void
3810 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3811 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3812 Fragment msg =
3813 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3814 checkContext.report(tree,
3815 diags.fragment(msg));
3816 }
3817
3818 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3819 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3820 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3821 }
3822 }
3823
3824 /* This method returns an environment to be used to attribute a lambda
3825 * expression.
3826 *
3827 * The owner of this environment is a method symbol. If the current owner
3828 * is not a method (e.g. if the lambda occurs in a field initializer), then
3829 * a synthetic method symbol owner is created.
3830 */
3831 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3832 Env<AttrContext> lambdaEnv;
3833 Symbol owner = env.info.scope.owner;
3834 if (owner.kind == VAR && owner.owner.kind == TYP) {
3835 // If the lambda is nested in a field initializer, we need to create a fake init method.
3836 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3837 // init symbol's owner).
3838 ClassSymbol enclClass = owner.enclClass();
3839 Name initName = owner.isStatic() ? names.clinit : names.init;
3840 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3841 initName, initBlockType, enclClass);
3842 initSym.params = List.nil();
3843 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3844 } else {
3845 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3846 }
3847 lambdaEnv.info.yieldResult = null;
3848 lambdaEnv.info.isLambda = true;
3849 return lambdaEnv;
3850 }
3851
3852 @Override
3853 public void visitReference(final JCMemberReference that) {
3854 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3855 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3856 //method reference only allowed in assignment or method invocation/cast context
3857 log.error(that.pos(), Errors.UnexpectedMref);
3858 }
3859 result = that.type = types.createErrorType(pt());
3860 return;
3861 }
3862 final Env<AttrContext> localEnv = env.dup(that);
3863 try {
3864 //attribute member reference qualifier - if this is a constructor
3865 //reference, the expected kind must be a type
3866 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3867
3868 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3869 exprType = chk.checkConstructorRefType(that.expr, exprType);
3870 if (!exprType.isErroneous() &&
3871 exprType.isRaw() &&
3872 that.typeargs != null) {
3873 log.error(that.expr.pos(),
3874 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3875 Fragments.MrefInferAndExplicitParams));
3876 exprType = types.createErrorType(exprType);
3877 }
3878 }
3879
3880 if (exprType.isErroneous()) {
3881 //if the qualifier expression contains problems,
3882 //give up attribution of method reference
3883 result = that.type = exprType;
3884 return;
3885 }
3886
3887 if (TreeInfo.isStaticSelector(that.expr, names)) {
3888 //if the qualifier is a type, validate it; raw warning check is
3889 //omitted as we don't know at this stage as to whether this is a
3890 //raw selector (because of inference)
3891 chk.validate(that.expr, env, false);
3892 } else {
3893 Symbol lhsSym = TreeInfo.symbol(that.expr);
3894 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3895 }
3896 //attrib type-arguments
3897 List<Type> typeargtypes = List.nil();
3898 if (that.typeargs != null) {
3899 typeargtypes = attribTypes(that.typeargs, localEnv);
3900 }
3901
3902 boolean isTargetSerializable =
3903 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3904 rs.isSerializable(pt());
3905 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3906 Type currentTarget = targetInfo.target;
3907 Type desc = targetInfo.descriptor;
3908
3909 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3910 List<Type> argtypes = desc.getParameterTypes();
3911 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3912
3913 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3914 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3915 }
3916
3917 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3918 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3919 try {
3920 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3921 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3922 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3923 } finally {
3924 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3925 }
3926
3927 Symbol refSym = refResult.fst;
3928 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3929
3930 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3931 * JDK-8075541
3932 */
3933 if (refSym.kind != MTH) {
3934 boolean targetError;
3935 switch (refSym.kind) {
3936 case ABSENT_MTH:
3937 targetError = false;
3938 break;
3939 case WRONG_MTH:
3940 case WRONG_MTHS:
3941 case AMBIGUOUS:
3942 case HIDDEN:
3943 case STATICERR:
3944 targetError = true;
3945 break;
3946 default:
3947 Assert.error("unexpected result kind " + refSym.kind);
3948 targetError = false;
3949 }
3950
3951 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3952 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3953 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3954
3955 JCDiagnostic diag = diags.create(log.currentSource(), that,
3956 targetError ?
3957 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3958 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3959
3960 if (targetError && currentTarget == Type.recoveryType) {
3961 //a target error doesn't make sense during recovery stage
3962 //as we don't know what actual parameter types are
3963 result = that.type = currentTarget;
3964 return;
3965 } else {
3966 if (targetError) {
3967 resultInfo.checkContext.report(that, diag);
3968 } else {
3969 log.report(diag);
3970 }
3971 result = that.type = types.createErrorType(currentTarget);
3972 return;
3973 }
3974 }
3975
3976 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3977 that.kind = lookupHelper.referenceKind(that.sym);
3978 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3979
3980 if (desc.getReturnType() == Type.recoveryType) {
3981 // stop here
3982 result = that.type = currentTarget;
3983 return;
3984 }
3985
3986 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3987 checkNewInnerClass(that.pos(), env, exprType, false);
3988 }
3989
3990 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3991
3992 if (that.getMode() == ReferenceMode.INVOKE &&
3993 TreeInfo.isStaticSelector(that.expr, names) &&
3994 that.kind.isUnbound() &&
3995 lookupHelper.site.isRaw()) {
3996 chk.checkRaw(that.expr, localEnv);
3997 }
3998
3999 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
4000 exprType.getTypeArguments().nonEmpty()) {
4001 //static ref with class type-args
4002 log.error(that.expr.pos(),
4003 Errors.InvalidMref(Kinds.kindName(that.getMode()),
4004 Fragments.StaticMrefWithTargs));
4005 result = that.type = types.createErrorType(currentTarget);
4006 return;
4007 }
4008
4009 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
4010 // Check that super-qualified symbols are not abstract (JLS)
4011 rs.checkNonAbstract(that.pos(), that.sym);
4012 }
4013
4014 if (isTargetSerializable) {
4015 chk.checkAccessFromSerializableElement(that, true);
4016 }
4017 }
4018
4019 ResultInfo checkInfo =
4020 resultInfo.dup(newMethodTemplate(
4021 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
4022 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
4023 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
4024
4025 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
4026
4027 if (that.kind.isUnbound() &&
4028 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
4029 //re-generate inference constraints for unbound receiver
4030 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
4031 //cannot happen as this has already been checked - we just need
4032 //to regenerate the inference constraints, as that has been lost
4033 //as a result of the call to inferenceContext.save()
4034 Assert.error("Can't get here");
4035 }
4036 }
4037
4038 if (!refType.isErroneous()) {
4039 refType = types.createMethodTypeWithReturn(refType,
4040 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
4041 }
4042
4043 //go ahead with standard method reference compatibility check - note that param check
4044 //is a no-op (as this has been taken care during method applicability)
4045 boolean isSpeculativeRound =
4046 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
4047
4048 that.type = currentTarget; //avoids recovery at this stage
4049 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
4050 if (!isSpeculativeRound) {
4051 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
4052 }
4053 chk.checkRequiresIdentity(that, localEnv.info.lint);
4054 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
4055 } catch (Types.FunctionDescriptorLookupError ex) {
4056 JCDiagnostic cause = ex.getDiagnostic();
4057 resultInfo.checkContext.report(that, cause);
4058 result = that.type = types.createErrorType(pt());
4059 return;
4060 }
4061 }
4062 //where
4063 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
4064 //if this is a constructor reference, the expected kind must be a type
4065 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
4066 KindSelector.VAL_TYP : KindSelector.TYP,
4067 Type.noType);
4068 }
4069
4070
4071 @SuppressWarnings("fallthrough")
4072 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
4073 InferenceContext inferenceContext = checkContext.inferenceContext();
4074 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
4075
4076 Type resType;
4077 switch (tree.getMode()) {
4078 case NEW:
4079 if (!tree.expr.type.isRaw()) {
4080 resType = tree.expr.type;
4081 break;
4082 }
4083 default:
4084 resType = refType.getReturnType();
4085 }
4086
4087 Type incompatibleReturnType = resType;
4088
4089 if (returnType.hasTag(VOID)) {
4090 incompatibleReturnType = null;
4091 }
4092
4093 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
4094 if (resType.isErroneous() ||
4095 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
4096 checkContext.checkWarner(tree, resType, returnType))) {
4097 incompatibleReturnType = null;
4098 }
4099 }
4100
4101 if (incompatibleReturnType != null) {
4102 Fragment msg =
4103 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
4104 checkContext.report(tree, diags.fragment(msg));
4105 } else {
4106 if (inferenceContext.free(refType)) {
4107 // we need to wait for inference to finish and then replace inference vars in the referent type
4108 inferenceContext.addFreeTypeListener(List.of(refType),
4109 instantiatedContext -> {
4110 tree.referentType = instantiatedContext.asInstType(refType);
4111 });
4112 } else {
4113 tree.referentType = refType;
4114 }
4115 }
4116
4117 if (!speculativeAttr) {
4118 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
4119 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
4120 }
4121 }
4122 }
4123
4124 boolean checkExConstraints(
4125 List<Type> thrownByFuncExpr,
4126 List<Type> thrownAtFuncType,
4127 InferenceContext inferenceContext) {
4128 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
4129 * are not proper types
4130 */
4131 List<Type> nonProperList = thrownAtFuncType.stream()
4132 .filter(e -> inferenceContext.free(e)).collect(List.collector());
4133 List<Type> properList = thrownAtFuncType.diff(nonProperList);
4134
4135 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
4136 * in the throws clause of the invocation type of the method reference's compile-time
4137 * declaration
4138 */
4139 List<Type> checkedList = thrownByFuncExpr.stream()
4140 .filter(e -> chk.isChecked(e)).collect(List.collector());
4141
4142 /** If n = 0 (the function type's throws clause consists only of proper types), then
4143 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
4144 * in the throws clause, the constraint reduces to false; otherwise, the constraint
4145 * reduces to true
4146 */
4147 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
4148 for (Type checked : checkedList) {
4149 boolean isSubtype = false;
4150 for (Type proper : properList) {
4151 if (types.isSubtype(checked, proper)) {
4152 isSubtype = true;
4153 break;
4154 }
4155 }
4156 if (!isSubtype) {
4157 uncaughtByProperTypes.add(checked);
4158 }
4159 }
4160
4161 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
4162 return false;
4163 }
4164
4165 /** If n > 0, the constraint reduces to a set of subtyping constraints:
4166 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
4167 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
4168 */
4169 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
4170 uncaughtByProperTypes.forEach(checkedEx -> {
4171 nonProperAsUndet.forEach(nonProper -> {
4172 types.isSubtype(checkedEx, nonProper);
4173 });
4174 });
4175
4176 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
4177 */
4178 nonProperAsUndet.stream()
4179 .filter(t -> t.hasTag(UNDETVAR))
4180 .forEach(t -> ((UndetVar)t).setThrow());
4181 return true;
4182 }
4183
4184 /**
4185 * Set functional type info on the underlying AST. Note: as the target descriptor
4186 * might contain inference variables, we might need to register an hook in the
4187 * current inference context.
4188 */
4189 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4190 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4191 if (checkContext.inferenceContext().free(descriptorType)) {
4192 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4193 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4194 inferenceContext.asInstType(primaryTarget), checkContext));
4195 } else {
4196 fExpr.owner = env.info.scope.owner;
4197 if (pt.hasTag(CLASS)) {
4198 fExpr.target = primaryTarget;
4199 }
4200 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4201 pt != Type.recoveryType) {
4202 //check that functional interface class is well-formed
4203 try {
4204 /* Types.makeFunctionalInterfaceClass() may throw an exception
4205 * when it's executed post-inference. See the listener code
4206 * above.
4207 */
4208 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4209 names.empty, fExpr.target, ABSTRACT);
4210 if (csym != null) {
4211 chk.checkImplementations(env.tree, csym, csym);
4212 try {
4213 //perform an additional functional interface check on the synthetic class,
4214 //as there may be spurious errors for raw targets - because of existing issues
4215 //with membership and inheritance (see JDK-8074570).
4216 csym.flags_field |= INTERFACE;
4217 types.findDescriptorType(csym.type);
4218 } catch (FunctionDescriptorLookupError err) {
4219 resultInfo.checkContext.report(fExpr,
4220 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4221 }
4222 }
4223 } catch (Types.FunctionDescriptorLookupError ex) {
4224 JCDiagnostic cause = ex.getDiagnostic();
4225 resultInfo.checkContext.report(env.tree, cause);
4226 }
4227 }
4228 }
4229 }
4230
4231 public void visitParens(JCParens tree) {
4232 Type owntype = attribTree(tree.expr, env, resultInfo);
4233 result = check(tree, owntype, pkind(), resultInfo);
4234 Symbol sym = TreeInfo.symbol(tree);
4235 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4236 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4237 }
4238
4239 public void visitAssign(JCAssign tree) {
4240 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4241 Type capturedType = capture(owntype);
4242 attribExpr(tree.rhs, env, owntype);
4243 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4244 }
4245
4246 public void visitAssignop(JCAssignOp tree) {
4247 // Attribute arguments.
4248 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4249 Type operand = attribExpr(tree.rhs, env);
4250 // Find operator.
4251 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4252 if (operator != operators.noOpSymbol &&
4253 !owntype.isErroneous() &&
4254 !operand.isErroneous()) {
4255 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4256 chk.checkCastable(tree.rhs.pos(),
4257 operator.type.getReturnType(),
4258 owntype);
4259 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4260 }
4261 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4262 }
4263
4264 public void visitUnary(JCUnary tree) {
4265 // Attribute arguments.
4266 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4267 ? attribTree(tree.arg, env, varAssignmentInfo)
4268 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4269
4270 // Find operator.
4271 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4272 Type owntype = types.createErrorType(tree.type);
4273 if (operator != operators.noOpSymbol &&
4274 !argtype.isErroneous()) {
4275 owntype = (tree.getTag().isIncOrDecUnaryOp())
4276 ? tree.arg.type
4277 : operator.type.getReturnType();
4278 int opc = operator.opcode;
4279
4280 // If the argument is constant, fold it.
4281 if (argtype.constValue() != null) {
4282 Type ctype = cfolder.fold1(opc, argtype);
4283 if (ctype != null) {
4284 owntype = cfolder.coerce(ctype, owntype);
4285 }
4286 }
4287 }
4288 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4289 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4290 }
4291
4292 public void visitBinary(JCBinary tree) {
4293 // Attribute arguments.
4294 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4295 // x && y
4296 // include x's bindings when true in y
4297
4298 // x || y
4299 // include x's bindings when false in y
4300
4301 MatchBindings lhsBindings = matchBindings;
4302 List<BindingSymbol> propagatedBindings;
4303 switch (tree.getTag()) {
4304 case AND:
4305 propagatedBindings = lhsBindings.bindingsWhenTrue;
4306 break;
4307 case OR:
4308 propagatedBindings = lhsBindings.bindingsWhenFalse;
4309 break;
4310 default:
4311 propagatedBindings = List.nil();
4312 break;
4313 }
4314 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4315 Type right;
4316 try {
4317 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4318 } finally {
4319 rhsEnv.info.scope.leave();
4320 }
4321
4322 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4323
4324 // Find operator.
4325 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4326 Type owntype = types.createErrorType(tree.type);
4327 if (operator != operators.noOpSymbol &&
4328 !left.isErroneous() &&
4329 !right.isErroneous()) {
4330 owntype = operator.type.getReturnType();
4331 int opc = operator.opcode;
4332 // If both arguments are constants, fold them.
4333 if (left.constValue() != null && right.constValue() != null) {
4334 Type ctype = cfolder.fold2(opc, left, right);
4335 if (ctype != null) {
4336 owntype = cfolder.coerce(ctype, owntype);
4337 }
4338 }
4339
4340 // Check that argument types of a reference ==, != are
4341 // castable to each other, (JLS 15.21). Note: unboxing
4342 // comparisons will not have an acmp* opc at this point.
4343 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4344 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4345 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4346 }
4347 }
4348
4349 chk.checkDivZero(tree.rhs.pos(), operator, right);
4350 }
4351 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4352 }
4353
4354 public void visitTypeCast(final JCTypeCast tree) {
4355 Type clazztype = attribType(tree.clazz, env);
4356 chk.validate(tree.clazz, env, false);
4357 chk.checkRequiresIdentity(tree, env.info.lint);
4358 //a fresh environment is required for 292 inference to work properly ---
4359 //see Infer.instantiatePolymorphicSignatureInstance()
4360 Env<AttrContext> localEnv = env.dup(tree);
4361 //should we propagate the target type?
4362 final ResultInfo castInfo;
4363 JCExpression expr = TreeInfo.skipParens(tree.expr);
4364 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4365 if (isPoly) {
4366 //expression is a poly - we need to propagate target type info
4367 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4368 new Check.NestedCheckContext(resultInfo.checkContext) {
4369 @Override
4370 public boolean compatible(Type found, Type req, Warner warn) {
4371 return types.isCastable(found, req, warn);
4372 }
4373 });
4374 } else {
4375 //standalone cast - target-type info is not propagated
4376 castInfo = unknownExprInfo;
4377 }
4378 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4379 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4380 if (exprtype.constValue() != null)
4381 owntype = cfolder.coerce(exprtype, owntype);
4382 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4383 if (!isPoly)
4384 chk.checkRedundantCast(localEnv, tree);
4385 }
4386
4387 public void visitTypeTest(JCInstanceOf tree) {
4388 Type exprtype = attribExpr(tree.expr, env);
4389 if (exprtype.isPrimitive()) {
4390 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4391 } else {
4392 exprtype = chk.checkNullOrRefType(
4393 tree.expr.pos(), exprtype);
4394 }
4395 Type clazztype;
4396 JCTree typeTree;
4397 if (tree.pattern.getTag() == BINDINGPATTERN ||
4398 tree.pattern.getTag() == RECORDPATTERN) {
4399 attribExpr(tree.pattern, env, exprtype);
4400 clazztype = tree.pattern.type;
4401 if (types.isSubtype(exprtype, clazztype) &&
4402 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4403 tree.pattern.getTag() != RECORDPATTERN) {
4404 if (!allowUnconditionalPatternsInstanceOf) {
4405 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4406 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4407 }
4408 }
4409 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4410 } else {
4411 clazztype = attribType(tree.pattern, env);
4412 typeTree = tree.pattern;
4413 chk.validate(typeTree, env, false);
4414 }
4415 if (clazztype.isPrimitive()) {
4416 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4417 } else {
4418 if (!clazztype.hasTag(TYPEVAR)) {
4419 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4420 }
4421 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4422 boolean valid = false;
4423 if (allowReifiableTypesInInstanceof) {
4424 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4425 } else {
4426 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4427 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4428 allowReifiableTypesInInstanceof = true;
4429 }
4430 if (!valid) {
4431 clazztype = types.createErrorType(clazztype);
4432 }
4433 }
4434 }
4435 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4436 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4437 }
4438
4439 private boolean checkCastablePattern(DiagnosticPosition pos,
4440 Type exprType,
4441 Type pattType) {
4442 Warner warner = new Warner();
4443 // if any type is erroneous, the problem is reported elsewhere
4444 if (exprType.isErroneous() || pattType.isErroneous()) {
4445 return false;
4446 }
4447 if (!types.isCastable(exprType, pattType, warner)) {
4448 chk.basicHandler.report(pos,
4449 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4450 return false;
4451 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4452 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4453 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4454 return true;
4455 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4456 log.error(pos,
4457 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4458 return false;
4459 } else {
4460 return true;
4461 }
4462 }
4463
4464 @Override
4465 public void visitAnyPattern(JCAnyPattern tree) {
4466 result = tree.type = resultInfo.pt;
4467 }
4468
4469 public void visitBindingPattern(JCBindingPattern tree) {
4470 Type type;
4471 if (tree.var.vartype != null) {
4472 type = attribType(tree.var.vartype, env);
4473 } else {
4474 type = resultInfo.pt;
4475 }
4476 tree.type = tree.var.type = type;
4477 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4478 v.pos = tree.pos;
4479 tree.var.sym = v;
4480 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4481 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4482 }
4483 chk.validate(tree.var.vartype, env, true);
4484 if (tree.var.isImplicitlyTyped()) {
4485 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4486 : type);
4487 }
4488 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.var);
4489 if (!tree.var.isImplicitlyTyped()) {
4490 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var);
4491 }
4492 annotate.flush();
4493 result = tree.type;
4494 if (v.isUnnamedVariable()) {
4495 matchBindings = MatchBindingsComputer.EMPTY;
4496 } else {
4497 matchBindings = new MatchBindings(List.of(v), List.nil());
4498 }
4499 chk.checkRequiresIdentity(tree, env.info.lint);
4500 }
4501
4502 @Override
4503 public void visitRecordPattern(JCRecordPattern tree) {
4504 Type site;
4505
4506 if (tree.deconstructor == null) {
4507 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4508 tree.record = syms.errSymbol;
4509 site = tree.type = types.createErrorType(tree.record.type);
4510 } else {
4511 Type type = attribType(tree.deconstructor, env);
4512 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4513 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4514 if (inferred == null) {
4515 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4516 } else {
4517 type = inferred;
4518 }
4519 }
4520 tree.type = tree.deconstructor.type = type;
4521 site = types.capture(tree.type);
4522 }
4523
4524 List<Type> expectedRecordTypes;
4525 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4526 ClassSymbol record = (ClassSymbol) site.tsym;
4527 expectedRecordTypes = record.getRecordComponents()
4528 .stream()
4529 .map(rc -> types.memberType(site, rc))
4530 .map(t -> types.upward(t, types.captures(t)).baseType())
4531 .collect(List.collector());
4532 tree.record = record;
4533 } else {
4534 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4535 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4536 .limit(tree.nested.size())
4537 .collect(List.collector());
4538 tree.record = syms.errSymbol;
4539 }
4540 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4541 List<Type> recordTypes = expectedRecordTypes;
4542 List<JCPattern> nestedPatterns = tree.nested;
4543 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4544 try {
4545 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4546 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4547 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4548 outBindings.addAll(matchBindings.bindingsWhenTrue);
4549 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4550 nestedPatterns = nestedPatterns.tail;
4551 recordTypes = recordTypes.tail;
4552 }
4553 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4554 while (nestedPatterns.nonEmpty()) {
4555 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4556 nestedPatterns = nestedPatterns.tail;
4557 }
4558 List<Type> nestedTypes =
4559 tree.nested.stream().map(p -> p.type).collect(List.collector());
4560 log.error(tree.pos(),
4561 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4562 nestedTypes));
4563 }
4564 } finally {
4565 localEnv.info.scope.leave();
4566 }
4567 chk.validate(tree.deconstructor, env, true);
4568 result = tree.type;
4569 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4570 }
4571
4572 public void visitIndexed(JCArrayAccess tree) {
4573 Type owntype = types.createErrorType(tree.type);
4574 Type atype = attribExpr(tree.indexed, env);
4575 attribExpr(tree.index, env, syms.intType);
4576 if (types.isArray(atype))
4577 owntype = types.elemtype(atype);
4578 else if (!atype.hasTag(ERROR))
4579 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4580 if (!pkind().contains(KindSelector.VAL))
4581 owntype = capture(owntype);
4582 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4583 }
4584
4585 public void visitIdent(JCIdent tree) {
4586 Symbol sym;
4587
4588 // Find symbol
4589 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4590 // If we are looking for a method, the prototype `pt' will be a
4591 // method type with the type of the call's arguments as parameters.
4592 env.info.pendingResolutionPhase = null;
4593 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4594 } else if (tree.sym != null && tree.sym.kind != VAR) {
4595 sym = tree.sym;
4596 } else {
4597 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4598 }
4599 tree.sym = sym;
4600
4601 // Also find the environment current for the class where
4602 // sym is defined (`symEnv').
4603 Env<AttrContext> symEnv = env;
4604 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4605 sym.kind.matches(KindSelector.VAL_MTH) &&
4606 sym.owner.kind == TYP &&
4607 tree.name != names._this && tree.name != names._super) {
4608
4609 // Find environment in which identifier is defined.
4610 while (symEnv.outer != null &&
4611 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4612 symEnv = symEnv.outer;
4613 }
4614 }
4615
4616 // If symbol is a variable, ...
4617 if (sym.kind == VAR) {
4618 VarSymbol v = (VarSymbol)sym;
4619
4620 // ..., evaluate its initializer, if it has one, and check for
4621 // illegal forward reference.
4622 checkInit(tree, env, v, false);
4623
4624 // If we are expecting a variable (as opposed to a value), check
4625 // that the variable is assignable in the current environment.
4626 if (KindSelector.ASG.subset(pkind()))
4627 checkAssignable(tree.pos(), v, null, env);
4628 }
4629
4630 Env<AttrContext> env1 = env;
4631 if (sym.kind != ERR && sym.kind != TYP &&
4632 sym.owner != null && sym.owner != env1.enclClass.sym) {
4633 // If the found symbol is inaccessible, then it is
4634 // accessed through an enclosing instance. Locate this
4635 // enclosing instance:
4636 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4637 env1 = env1.outer;
4638 }
4639
4640 if (env.info.isSerializable) {
4641 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4642 }
4643
4644 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4645 }
4646
4647 public void visitSelect(JCFieldAccess tree) {
4648 // Determine the expected kind of the qualifier expression.
4649 KindSelector skind = KindSelector.NIL;
4650 if (tree.name == names._this || tree.name == names._super ||
4651 tree.name == names._class)
4652 {
4653 skind = KindSelector.TYP;
4654 } else {
4655 if (pkind().contains(KindSelector.PCK))
4656 skind = KindSelector.of(skind, KindSelector.PCK);
4657 if (pkind().contains(KindSelector.TYP))
4658 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4659 if (pkind().contains(KindSelector.VAL_MTH))
4660 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4661 }
4662
4663 // Attribute the qualifier expression, and determine its symbol (if any).
4664 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4665 Assert.check(site == tree.selected.type);
4666 if (!pkind().contains(KindSelector.TYP_PCK))
4667 site = capture(site); // Capture field access
4668
4669 // don't allow T.class T[].class, etc
4670 if (skind == KindSelector.TYP) {
4671 Type elt = site;
4672 while (elt.hasTag(ARRAY))
4673 elt = ((ArrayType)elt).elemtype;
4674 if (elt.hasTag(TYPEVAR)) {
4675 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4676 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4677 tree.sym = tree.type.tsym;
4678 return ;
4679 }
4680 }
4681
4682 // If qualifier symbol is a type or `super', assert `selectSuper'
4683 // for the selection. This is relevant for determining whether
4684 // protected symbols are accessible.
4685 Symbol sitesym = TreeInfo.symbol(tree.selected);
4686 boolean selectSuperPrev = env.info.selectSuper;
4687 env.info.selectSuper =
4688 sitesym != null &&
4689 sitesym.name == names._super;
4690
4691 // Determine the symbol represented by the selection.
4692 env.info.pendingResolutionPhase = null;
4693 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4694 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4695 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4696 sym = syms.errSymbol;
4697 }
4698 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4699 site = capture(site);
4700 sym = selectSym(tree, sitesym, site, env, resultInfo);
4701 }
4702 boolean varArgs = env.info.lastResolveVarargs();
4703 tree.sym = sym;
4704
4705 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4706 site = types.skipTypeVars(site, true);
4707 }
4708
4709 // If that symbol is a variable, ...
4710 if (sym.kind == VAR) {
4711 VarSymbol v = (VarSymbol)sym;
4712
4713 // ..., evaluate its initializer, if it has one, and check for
4714 // illegal forward reference.
4715 checkInit(tree, env, v, true);
4716
4717 // If we are expecting a variable (as opposed to a value), check
4718 // that the variable is assignable in the current environment.
4719 if (KindSelector.ASG.subset(pkind()))
4720 checkAssignable(tree.pos(), v, tree.selected, env);
4721 }
4722
4723 if (sitesym != null &&
4724 sitesym.kind == VAR &&
4725 ((VarSymbol)sitesym).isResourceVariable() &&
4726 sym.kind == MTH &&
4727 sym.name.equals(names.close) &&
4728 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4729 env.info.lint.logIfEnabled(tree, LintWarnings.TryExplicitCloseCall);
4730 }
4731
4732 // Disallow selecting a type from an expression
4733 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4734 tree.type = check(tree.selected, pt(),
4735 sitesym == null ?
4736 KindSelector.VAL : sitesym.kind.toSelector(),
4737 new ResultInfo(KindSelector.TYP_PCK, pt()));
4738 }
4739
4740 if (isType(sitesym)) {
4741 if (sym.name != names._this && sym.name != names._super) {
4742 // Check if type-qualified fields or methods are static (JLS)
4743 if ((sym.flags() & STATIC) == 0 &&
4744 sym.name != names._super &&
4745 (sym.kind == VAR || sym.kind == MTH)) {
4746 rs.accessBase(rs.new StaticError(sym),
4747 tree.pos(), site, sym.name, true);
4748 }
4749 }
4750 } else if (sym.kind != ERR &&
4751 (sym.flags() & STATIC) != 0 &&
4752 sym.name != names._class) {
4753 // If the qualified item is not a type and the selected item is static, report
4754 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4755 if (!sym.owner.isAnonymous()) {
4756 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4757 } else {
4758 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4759 }
4760 }
4761
4762 // If we are selecting an instance member via a `super', ...
4763 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4764
4765 // Check that super-qualified symbols are not abstract (JLS)
4766 rs.checkNonAbstract(tree.pos(), sym);
4767
4768 if (site.isRaw()) {
4769 // Determine argument types for site.
4770 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4771 if (site1 != null) site = site1;
4772 }
4773 }
4774
4775 if (env.info.isSerializable) {
4776 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4777 }
4778
4779 env.info.selectSuper = selectSuperPrev;
4780 result = checkId(tree, site, sym, env, resultInfo);
4781 }
4782 //where
4783 /** Determine symbol referenced by a Select expression,
4784 *
4785 * @param tree The select tree.
4786 * @param site The type of the selected expression,
4787 * @param env The current environment.
4788 * @param resultInfo The current result.
4789 */
4790 private Symbol selectSym(JCFieldAccess tree,
4791 Symbol location,
4792 Type site,
4793 Env<AttrContext> env,
4794 ResultInfo resultInfo) {
4795 DiagnosticPosition pos = tree.pos();
4796 Name name = tree.name;
4797 switch (site.getTag()) {
4798 case PACKAGE:
4799 return rs.accessBase(
4800 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4801 pos, location, site, name, true);
4802 case ARRAY:
4803 case CLASS:
4804 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4805 return rs.resolveQualifiedMethod(
4806 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4807 } else if (name == names._this || name == names._super) {
4808 return rs.resolveSelf(pos, env, site.tsym, tree);
4809 } else if (name == names._class) {
4810 // In this case, we have already made sure in
4811 // visitSelect that qualifier expression is a type.
4812 return syms.getClassField(site, types);
4813 } else {
4814 // We are seeing a plain identifier as selector.
4815 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4816 sym = rs.accessBase(sym, pos, location, site, name, true);
4817 return sym;
4818 }
4819 case WILDCARD:
4820 throw new AssertionError(tree);
4821 case TYPEVAR:
4822 // Normally, site.getUpperBound() shouldn't be null.
4823 // It should only happen during memberEnter/attribBase
4824 // when determining the supertype which *must* be
4825 // done before attributing the type variables. In
4826 // other words, we are seeing this illegal program:
4827 // class B<T> extends A<T.foo> {}
4828 Symbol sym = (site.getUpperBound() != null)
4829 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4830 : null;
4831 if (sym == null) {
4832 log.error(pos, Errors.TypeVarCantBeDeref);
4833 return syms.errSymbol;
4834 } else {
4835 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4836 rs.new AccessError(env, site, sym) :
4837 sym;
4838 rs.accessBase(sym2, pos, location, site, name, true);
4839 return sym;
4840 }
4841 case ERROR:
4842 // preserve identifier names through errors
4843 return types.createErrorType(name, site.tsym, site).tsym;
4844 default:
4845 // The qualifier expression is of a primitive type -- only
4846 // .class is allowed for these.
4847 if (name == names._class) {
4848 // In this case, we have already made sure in Select that
4849 // qualifier expression is a type.
4850 return syms.getClassField(site, types);
4851 } else {
4852 log.error(pos, Errors.CantDeref(site));
4853 return syms.errSymbol;
4854 }
4855 }
4856 }
4857
4858 /** Determine type of identifier or select expression and check that
4859 * (1) the referenced symbol is not deprecated
4860 * (2) the symbol's type is safe (@see checkSafe)
4861 * (3) if symbol is a variable, check that its type and kind are
4862 * compatible with the prototype and protokind.
4863 * (4) if symbol is an instance field of a raw type,
4864 * which is being assigned to, issue an unchecked warning if its
4865 * type changes under erasure.
4866 * (5) if symbol is an instance method of a raw type, issue an
4867 * unchecked warning if its argument types change under erasure.
4868 * If checks succeed:
4869 * If symbol is a constant, return its constant type
4870 * else if symbol is a method, return its result type
4871 * otherwise return its type.
4872 * Otherwise return errType.
4873 *
4874 * @param tree The syntax tree representing the identifier
4875 * @param site If this is a select, the type of the selected
4876 * expression, otherwise the type of the current class.
4877 * @param sym The symbol representing the identifier.
4878 * @param env The current environment.
4879 * @param resultInfo The expected result
4880 */
4881 Type checkId(JCTree tree,
4882 Type site,
4883 Symbol sym,
4884 Env<AttrContext> env,
4885 ResultInfo resultInfo) {
4886 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4887 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4888 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4889 }
4890
4891 Type checkMethodIdInternal(JCTree tree,
4892 Type site,
4893 Symbol sym,
4894 Env<AttrContext> env,
4895 ResultInfo resultInfo) {
4896 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4897 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4898 } else {
4899 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4900 }
4901 }
4902
4903 Type checkIdInternal(JCTree tree,
4904 Type site,
4905 Symbol sym,
4906 Type pt,
4907 Env<AttrContext> env,
4908 ResultInfo resultInfo) {
4909 Type owntype; // The computed type of this identifier occurrence.
4910 switch (sym.kind) {
4911 case TYP:
4912 // For types, the computed type equals the symbol's type,
4913 // except for two situations:
4914 owntype = sym.type;
4915 if (owntype.hasTag(CLASS)) {
4916 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4917 Type ownOuter = owntype.getEnclosingType();
4918
4919 // (a) If the symbol's type is parameterized, erase it
4920 // because no type parameters were given.
4921 // We recover generic outer type later in visitTypeApply.
4922 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4923 owntype = types.erasure(owntype);
4924 }
4925
4926 // (b) If the symbol's type is an inner class, then
4927 // we have to interpret its outer type as a superclass
4928 // of the site type. Example:
4929 //
4930 // class Tree<A> { class Visitor { ... } }
4931 // class PointTree extends Tree<Point> { ... }
4932 // ...PointTree.Visitor...
4933 //
4934 // Then the type of the last expression above is
4935 // Tree<Point>.Visitor.
4936 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4937 Type normOuter = site;
4938 if (normOuter.hasTag(CLASS)) {
4939 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4940 }
4941 if (normOuter == null) // perhaps from an import
4942 normOuter = types.erasure(ownOuter);
4943 if (normOuter != ownOuter)
4944 owntype = new ClassType(
4945 normOuter, List.nil(), owntype.tsym,
4946 owntype.getMetadata());
4947 }
4948 }
4949 break;
4950 case VAR:
4951 VarSymbol v = (VarSymbol)sym;
4952
4953 if (env.info.enclVar != null
4954 && v.type.hasTag(NONE)) {
4955 //self reference to implicitly typed variable declaration
4956 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4957 return tree.type = v.type = types.createErrorType(v.type);
4958 }
4959
4960 // Test (4): if symbol is an instance field of a raw type,
4961 // which is being assigned to, issue an unchecked warning if
4962 // its type changes under erasure.
4963 if (KindSelector.ASG.subset(pkind()) &&
4964 v.owner.kind == TYP &&
4965 (v.flags() & STATIC) == 0 &&
4966 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4967 Type s = types.asOuterSuper(site, v.owner);
4968 if (s != null &&
4969 s.isRaw() &&
4970 !types.isSameType(v.type, v.erasure(types))) {
4971 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4972 }
4973 }
4974 // The computed type of a variable is the type of the
4975 // variable symbol, taken as a member of the site type.
4976 owntype = (sym.owner.kind == TYP &&
4977 sym.name != names._this && sym.name != names._super)
4978 ? types.memberType(site, sym)
4979 : sym.type;
4980
4981 // If the variable is a constant, record constant value in
4982 // computed type.
4983 if (v.getConstValue() != null && isStaticReference(tree))
4984 owntype = owntype.constType(v.getConstValue());
4985
4986 if (resultInfo.pkind == KindSelector.VAL) {
4987 owntype = capture(owntype); // capture "names as expressions"
4988 }
4989 break;
4990 case MTH: {
4991 owntype = checkMethod(site, sym,
4992 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4993 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4994 resultInfo.pt.getTypeArguments());
4995 chk.checkRestricted(tree.pos(), sym);
4996 break;
4997 }
4998 case PCK: case ERR:
4999 owntype = sym.type;
5000 break;
5001 default:
5002 throw new AssertionError("unexpected kind: " + sym.kind +
5003 " in tree " + tree);
5004 }
5005
5006 // Emit a `deprecation' warning if symbol is deprecated.
5007 // (for constructors (but not for constructor references), the error
5008 // was given when the constructor was resolved)
5009
5010 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
5011 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
5012 chk.checkSunAPI(tree.pos(), sym);
5013 chk.checkProfile(tree.pos(), sym);
5014 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
5015 }
5016
5017 if (pt.isErroneous()) {
5018 owntype = types.createErrorType(owntype);
5019 }
5020
5021 // If symbol is a variable, check that its type and
5022 // kind are compatible with the prototype and protokind.
5023 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
5024 }
5025
5026 /** Check that variable is initialized and evaluate the variable's
5027 * initializer, if not yet done. Also check that variable is not
5028 * referenced before it is defined.
5029 * @param tree The tree making up the variable reference.
5030 * @param env The current environment.
5031 * @param v The variable's symbol.
5032 */
5033 private void checkInit(JCTree tree,
5034 Env<AttrContext> env,
5035 VarSymbol v,
5036 boolean onlyWarning) {
5037 // A forward reference is diagnosed if the declaration position
5038 // of the variable is greater than the current tree position
5039 // and the tree and variable definition occur in the same class
5040 // definition. Note that writes don't count as references.
5041 // This check applies only to class and instance
5042 // variables. Local variables follow different scope rules,
5043 // and are subject to definite assignment checking.
5044 Env<AttrContext> initEnv = enclosingInitEnv(env);
5045 if (initEnv != null &&
5046 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
5047 v.owner.kind == TYP &&
5048 v.owner == env.info.scope.owner.enclClass() &&
5049 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
5050 (!env.tree.hasTag(ASSIGN) ||
5051 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
5052 if (!onlyWarning || isStaticEnumField(v)) {
5053 Error errkey = (initEnv.info.enclVar == v) ?
5054 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
5055 log.error(tree.pos(), errkey);
5056 } else if (useBeforeDeclarationWarning) {
5057 Warning warnkey = (initEnv.info.enclVar == v) ?
5058 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
5059 log.warning(tree.pos(), warnkey);
5060 }
5061 }
5062
5063 v.getConstValue(); // ensure initializer is evaluated
5064
5065 checkEnumInitializer(tree, env, v);
5066 }
5067
5068 /**
5069 * Returns the enclosing init environment associated with this env (if any). An init env
5070 * can be either a field declaration env or a static/instance initializer env.
5071 */
5072 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
5073 while (true) {
5074 switch (env.tree.getTag()) {
5075 case VARDEF:
5076 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
5077 if (vdecl.sym.owner.kind == TYP) {
5078 //field
5079 return env;
5080 }
5081 break;
5082 case BLOCK:
5083 if (env.next.tree.hasTag(CLASSDEF)) {
5084 //instance/static initializer
5085 return env;
5086 }
5087 break;
5088 case METHODDEF:
5089 case CLASSDEF:
5090 case TOPLEVEL:
5091 return null;
5092 }
5093 Assert.checkNonNull(env.next);
5094 env = env.next;
5095 }
5096 }
5097
5098 /**
5099 * Check for illegal references to static members of enum. In
5100 * an enum type, constructors and initializers may not
5101 * reference its static members unless they are constant.
5102 *
5103 * @param tree The tree making up the variable reference.
5104 * @param env The current environment.
5105 * @param v The variable's symbol.
5106 * @jls 8.9 Enum Types
5107 */
5108 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
5109 // JLS:
5110 //
5111 // "It is a compile-time error to reference a static field
5112 // of an enum type that is not a compile-time constant
5113 // (15.28) from constructors, instance initializer blocks,
5114 // or instance variable initializer expressions of that
5115 // type. It is a compile-time error for the constructors,
5116 // instance initializer blocks, or instance variable
5117 // initializer expressions of an enum constant e to refer
5118 // to itself or to an enum constant of the same type that
5119 // is declared to the right of e."
5120 if (isStaticEnumField(v)) {
5121 ClassSymbol enclClass = env.info.scope.owner.enclClass();
5122
5123 if (enclClass == null || enclClass.owner == null)
5124 return;
5125
5126 // See if the enclosing class is the enum (or a
5127 // subclass thereof) declaring v. If not, this
5128 // reference is OK.
5129 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
5130 return;
5131
5132 // If the reference isn't from an initializer, then
5133 // the reference is OK.
5134 if (!Resolve.isInitializer(env))
5135 return;
5136
5137 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
5138 }
5139 }
5140
5141 /** Is the given symbol a static, non-constant field of an Enum?
5142 * Note: enum literals should not be regarded as such
5143 */
5144 private boolean isStaticEnumField(VarSymbol v) {
5145 return Flags.isEnum(v.owner) &&
5146 Flags.isStatic(v) &&
5147 !Flags.isConstant(v) &&
5148 v.name != names._class;
5149 }
5150
5151 /**
5152 * Check that method arguments conform to its instantiation.
5153 **/
5154 public Type checkMethod(Type site,
5155 final Symbol sym,
5156 ResultInfo resultInfo,
5157 Env<AttrContext> env,
5158 final List<JCExpression> argtrees,
5159 List<Type> argtypes,
5160 List<Type> typeargtypes) {
5161 // Test (5): if symbol is an instance method of a raw type, issue
5162 // an unchecked warning if its argument types change under erasure.
5163 if ((sym.flags() & STATIC) == 0 &&
5164 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5165 Type s = types.asOuterSuper(site, sym.owner);
5166 if (s != null && s.isRaw() &&
5167 !types.isSameTypes(sym.type.getParameterTypes(),
5168 sym.erasure(types).getParameterTypes())) {
5169 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
5170 }
5171 }
5172
5173 if (env.info.defaultSuperCallSite != null) {
5174 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5175 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5176 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5177 List<MethodSymbol> icand_sup =
5178 types.interfaceCandidates(sup, (MethodSymbol)sym);
5179 if (icand_sup.nonEmpty() &&
5180 icand_sup.head != sym &&
5181 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5182 log.error(env.tree.pos(),
5183 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5184 break;
5185 }
5186 }
5187 env.info.defaultSuperCallSite = null;
5188 }
5189
5190 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5191 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5192 if (app.meth.hasTag(SELECT) &&
5193 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5194 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5195 }
5196 }
5197
5198 // Compute the identifier's instantiated type.
5199 // For methods, we need to compute the instance type by
5200 // Resolve.instantiate from the symbol's type as well as
5201 // any type arguments and value arguments.
5202 Warner noteWarner = new Warner();
5203 try {
5204 Type owntype = rs.checkMethod(
5205 env,
5206 site,
5207 sym,
5208 resultInfo,
5209 argtypes,
5210 typeargtypes,
5211 noteWarner);
5212
5213 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5214 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5215
5216 argtypes = argtypes.map(checkDeferredMap);
5217
5218 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5219 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5220 sym.name,
5221 rs.methodArguments(sym.type.getParameterTypes()),
5222 rs.methodArguments(argtypes.map(checkDeferredMap)),
5223 kindName(sym.location()),
5224 sym.location()));
5225 if (resultInfo.pt != Infer.anyPoly ||
5226 !owntype.hasTag(METHOD) ||
5227 !owntype.isPartial()) {
5228 //if this is not a partially inferred method type, erase return type. Otherwise,
5229 //erasure is carried out in PartiallyInferredMethodType.check().
5230 owntype = new MethodType(owntype.getParameterTypes(),
5231 types.erasure(owntype.getReturnType()),
5232 types.erasure(owntype.getThrownTypes()),
5233 syms.methodClass);
5234 }
5235 }
5236
5237 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5238 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5239 PolyKind.POLY : PolyKind.STANDALONE;
5240 TreeInfo.setPolyKind(env.tree, pkind);
5241
5242 return (resultInfo.pt == Infer.anyPoly) ?
5243 owntype :
5244 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5245 resultInfo.checkContext.inferenceContext());
5246 } catch (Infer.InferenceException ex) {
5247 //invalid target type - propagate exception outwards or report error
5248 //depending on the current check context
5249 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5250 return types.createErrorType(site);
5251 } catch (Resolve.InapplicableMethodException ex) {
5252 final JCDiagnostic diag = ex.getDiagnostic();
5253 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5254 @Override
5255 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5256 return new Pair<>(sym, diag);
5257 }
5258 };
5259 List<Type> argtypes2 = argtypes.map(
5260 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5261 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5262 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5263 log.report(errDiag);
5264 return types.createErrorType(site);
5265 }
5266 }
5267
5268 public void visitLiteral(JCLiteral tree) {
5269 result = check(tree, litType(tree.typetag).constType(tree.value),
5270 KindSelector.VAL, resultInfo);
5271 }
5272 //where
5273 /** Return the type of a literal with given type tag.
5274 */
5275 Type litType(TypeTag tag) {
5276 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5277 }
5278
5279 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5280 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5281 }
5282
5283 public void visitTypeArray(JCArrayTypeTree tree) {
5284 Type etype = attribType(tree.elemtype, env);
5285 Type type = new ArrayType(etype, syms.arrayClass);
5286 result = check(tree, type, KindSelector.TYP, resultInfo);
5287 }
5288
5289 /** Visitor method for parameterized types.
5290 * Bound checking is left until later, since types are attributed
5291 * before supertype structure is completely known
5292 */
5293 public void visitTypeApply(JCTypeApply tree) {
5294 Type owntype = types.createErrorType(tree.type);
5295
5296 // Attribute functor part of application and make sure it's a class.
5297 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5298
5299 // Attribute type parameters
5300 List<Type> actuals = attribTypes(tree.arguments, env);
5301
5302 if (clazztype.hasTag(CLASS)) {
5303 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5304 if (actuals.isEmpty()) //diamond
5305 actuals = formals;
5306
5307 if (actuals.length() == formals.length()) {
5308 List<Type> a = actuals;
5309 List<Type> f = formals;
5310 while (a.nonEmpty()) {
5311 a.head = a.head.withTypeVar(f.head);
5312 a = a.tail;
5313 f = f.tail;
5314 }
5315 // Compute the proper generic outer
5316 Type clazzOuter = clazztype.getEnclosingType();
5317 if (clazzOuter.hasTag(CLASS)) {
5318 Type site;
5319 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5320 if (clazz.hasTag(IDENT)) {
5321 site = env.enclClass.sym.type;
5322 } else if (clazz.hasTag(SELECT)) {
5323 site = ((JCFieldAccess) clazz).selected.type;
5324 } else throw new AssertionError(""+tree);
5325 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5326 if (site.hasTag(CLASS))
5327 site = types.asOuterSuper(site, clazzOuter.tsym);
5328 if (site == null)
5329 site = types.erasure(clazzOuter);
5330 clazzOuter = site;
5331 }
5332 }
5333 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5334 clazztype.getMetadata());
5335 } else {
5336 if (formals.length() != 0) {
5337 log.error(tree.pos(),
5338 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5339 } else {
5340 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5341 }
5342 owntype = types.createErrorType(tree.type);
5343 }
5344 } else if (clazztype.hasTag(ERROR)) {
5345 ErrorType parameterizedErroneous =
5346 new ErrorType(clazztype.getOriginalType(),
5347 clazztype.tsym,
5348 clazztype.getMetadata());
5349
5350 parameterizedErroneous.typarams_field = actuals;
5351 owntype = parameterizedErroneous;
5352 }
5353 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5354 }
5355
5356 public void visitTypeUnion(JCTypeUnion tree) {
5357 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5358 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5359 for (JCExpression typeTree : tree.alternatives) {
5360 Type ctype = attribType(typeTree, env);
5361 ctype = chk.checkType(typeTree.pos(),
5362 chk.checkClassType(typeTree.pos(), ctype),
5363 syms.throwableType);
5364 if (!ctype.isErroneous()) {
5365 //check that alternatives of a union type are pairwise
5366 //unrelated w.r.t. subtyping
5367 if (chk.intersects(ctype, multicatchTypes.toList())) {
5368 for (Type t : multicatchTypes) {
5369 boolean sub = types.isSubtype(ctype, t);
5370 boolean sup = types.isSubtype(t, ctype);
5371 if (sub || sup) {
5372 //assume 'a' <: 'b'
5373 Type a = sub ? ctype : t;
5374 Type b = sub ? t : ctype;
5375 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5376 }
5377 }
5378 }
5379 multicatchTypes.append(ctype);
5380 if (all_multicatchTypes != null)
5381 all_multicatchTypes.append(ctype);
5382 } else {
5383 if (all_multicatchTypes == null) {
5384 all_multicatchTypes = new ListBuffer<>();
5385 all_multicatchTypes.appendList(multicatchTypes);
5386 }
5387 all_multicatchTypes.append(ctype);
5388 }
5389 }
5390 Type t = check(tree, types.lub(multicatchTypes.toList()),
5391 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5392 if (t.hasTag(CLASS)) {
5393 List<Type> alternatives =
5394 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5395 t = new UnionClassType((ClassType) t, alternatives);
5396 }
5397 tree.type = result = t;
5398 }
5399
5400 public void visitTypeIntersection(JCTypeIntersection tree) {
5401 attribTypes(tree.bounds, env);
5402 tree.type = result = checkIntersection(tree, tree.bounds);
5403 }
5404
5405 public void visitTypeParameter(JCTypeParameter tree) {
5406 TypeVar typeVar = (TypeVar) tree.type;
5407
5408 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5409 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5410 }
5411
5412 if (!typeVar.getUpperBound().isErroneous()) {
5413 //fixup type-parameter bound computed in 'attribTypeVariables'
5414 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5415 }
5416 }
5417
5418 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5419 Set<Symbol> boundSet = new HashSet<>();
5420 if (bounds.nonEmpty()) {
5421 // accept class or interface or typevar as first bound.
5422 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5423 boundSet.add(types.erasure(bounds.head.type).tsym);
5424 if (bounds.head.type.isErroneous()) {
5425 return bounds.head.type;
5426 }
5427 else if (bounds.head.type.hasTag(TYPEVAR)) {
5428 // if first bound was a typevar, do not accept further bounds.
5429 if (bounds.tail.nonEmpty()) {
5430 log.error(bounds.tail.head.pos(),
5431 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5432 return bounds.head.type;
5433 }
5434 } else {
5435 // if first bound was a class or interface, accept only interfaces
5436 // as further bounds.
5437 for (JCExpression bound : bounds.tail) {
5438 bound.type = checkBase(bound.type, bound, env, false, true, false);
5439 if (bound.type.isErroneous()) {
5440 bounds = List.of(bound);
5441 }
5442 else if (bound.type.hasTag(CLASS)) {
5443 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5444 }
5445 }
5446 }
5447 }
5448
5449 if (bounds.length() == 0) {
5450 return syms.objectType;
5451 } else if (bounds.length() == 1) {
5452 return bounds.head.type;
5453 } else {
5454 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5455 // ... the variable's bound is a class type flagged COMPOUND
5456 // (see comment for TypeVar.bound).
5457 // In this case, generate a class tree that represents the
5458 // bound class, ...
5459 JCExpression extending;
5460 List<JCExpression> implementing;
5461 if (!bounds.head.type.isInterface()) {
5462 extending = bounds.head;
5463 implementing = bounds.tail;
5464 } else {
5465 extending = null;
5466 implementing = bounds;
5467 }
5468 JCClassDecl cd = make.at(tree).ClassDef(
5469 make.Modifiers(PUBLIC | ABSTRACT),
5470 names.empty, List.nil(),
5471 extending, implementing, List.nil());
5472
5473 ClassSymbol c = (ClassSymbol)owntype.tsym;
5474 Assert.check((c.flags() & COMPOUND) != 0);
5475 cd.sym = c;
5476 c.sourcefile = env.toplevel.sourcefile;
5477
5478 // ... and attribute the bound class
5479 c.flags_field |= UNATTRIBUTED;
5480 Env<AttrContext> cenv = enter.classEnv(cd, env);
5481 typeEnvs.put(c, cenv);
5482 attribClass(c);
5483 return owntype;
5484 }
5485 }
5486
5487 public void visitWildcard(JCWildcard tree) {
5488 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5489 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5490 ? syms.objectType
5491 : attribType(tree.inner, env);
5492 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5493 tree.kind.kind,
5494 syms.boundClass),
5495 KindSelector.TYP, resultInfo);
5496 }
5497
5498 public void visitAnnotation(JCAnnotation tree) {
5499 Assert.error("should be handled in annotate");
5500 }
5501
5502 @Override
5503 public void visitModifiers(JCModifiers tree) {
5504 //error recovery only:
5505 Assert.check(resultInfo.pkind == KindSelector.ERR);
5506
5507 attribAnnotationTypes(tree.annotations, env);
5508 }
5509
5510 public void visitAnnotatedType(JCAnnotatedType tree) {
5511 attribAnnotationTypes(tree.annotations, env);
5512 Type underlyingType = attribType(tree.underlyingType, env);
5513 Type annotatedType = underlyingType.preannotatedType();
5514
5515 if (!env.info.isAnonymousNewClass)
5516 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5517 result = tree.type = annotatedType;
5518 }
5519
5520 public void visitErroneous(JCErroneous tree) {
5521 if (tree.errs != null) {
5522 WriteableScope newScope = env.info.scope;
5523
5524 if (env.tree instanceof JCClassDecl) {
5525 Symbol fakeOwner =
5526 new MethodSymbol(BLOCK, names.empty, null,
5527 env.info.scope.owner);
5528 newScope = newScope.dupUnshared(fakeOwner);
5529 }
5530
5531 Env<AttrContext> errEnv =
5532 env.dup(env.tree,
5533 env.info.dup(newScope));
5534 errEnv.info.returnResult = unknownExprInfo;
5535 for (JCTree err : tree.errs)
5536 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5537 }
5538 result = tree.type = syms.errType;
5539 }
5540
5541 /** Default visitor method for all other trees.
5542 */
5543 public void visitTree(JCTree tree) {
5544 throw new AssertionError();
5545 }
5546
5547 /**
5548 * Attribute an env for either a top level tree or class or module declaration.
5549 */
5550 public void attrib(Env<AttrContext> env) {
5551 switch (env.tree.getTag()) {
5552 case MODULEDEF:
5553 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5554 break;
5555 case PACKAGEDEF:
5556 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5557 break;
5558 default:
5559 attribClass(env.tree.pos(), env.enclClass.sym);
5560 }
5561
5562 annotate.flush();
5563 }
5564
5565 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5566 try {
5567 annotate.flush();
5568 attribPackage(p);
5569 } catch (CompletionFailure ex) {
5570 chk.completionError(pos, ex);
5571 }
5572 }
5573
5574 void attribPackage(PackageSymbol p) {
5575 attribWithLint(p,
5576 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5577 }
5578
5579 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5580 try {
5581 annotate.flush();
5582 attribModule(m);
5583 } catch (CompletionFailure ex) {
5584 chk.completionError(pos, ex);
5585 }
5586 }
5587
5588 void attribModule(ModuleSymbol m) {
5589 attribWithLint(m, env -> attribStat(env.tree, env));
5590 }
5591
5592 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5593 Env<AttrContext> env = typeEnvs.get(sym);
5594
5595 Env<AttrContext> lintEnv = env;
5596 while (lintEnv.info.lint == null)
5597 lintEnv = lintEnv.next;
5598
5599 Lint lint = lintEnv.info.lint.augment(sym);
5600
5601 Lint prevLint = chk.setLint(lint);
5602 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5603
5604 try {
5605 deferredLintHandler.flush(env.tree, lint);
5606 attrib.accept(env);
5607 } finally {
5608 log.useSource(prev);
5609 chk.setLint(prevLint);
5610 }
5611 }
5612
5613 /** Main method: attribute class definition associated with given class symbol.
5614 * reporting completion failures at the given position.
5615 * @param pos The source position at which completion errors are to be
5616 * reported.
5617 * @param c The class symbol whose definition will be attributed.
5618 */
5619 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5620 try {
5621 annotate.flush();
5622 attribClass(c);
5623 } catch (CompletionFailure ex) {
5624 chk.completionError(pos, ex);
5625 }
5626 }
5627
5628 /** Attribute class definition associated with given class symbol.
5629 * @param c The class symbol whose definition will be attributed.
5630 */
5631 void attribClass(ClassSymbol c) throws CompletionFailure {
5632 if (c.type.hasTag(ERROR)) return;
5633
5634 // Check for cycles in the inheritance graph, which can arise from
5635 // ill-formed class files.
5636 chk.checkNonCyclic(null, c.type);
5637
5638 Type st = types.supertype(c.type);
5639 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5640 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5641 // First, attribute superclass.
5642 if (st.hasTag(CLASS))
5643 attribClass((ClassSymbol)st.tsym);
5644
5645 // Next attribute owner, if it is a class.
5646 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5647 attribClass((ClassSymbol)c.owner);
5648
5649 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5650 }
5651
5652 // The previous operations might have attributed the current class
5653 // if there was a cycle. So we test first whether the class is still
5654 // UNATTRIBUTED.
5655 if ((c.flags_field & UNATTRIBUTED) != 0) {
5656 c.flags_field &= ~UNATTRIBUTED;
5657
5658 // Get environment current at the point of class definition.
5659 Env<AttrContext> env = typeEnvs.get(c);
5660
5661 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5662 // because the annotations were not available at the time the env was created. Therefore,
5663 // we look up the environment chain for the first enclosing environment for which the
5664 // lint value is set. Typically, this is the parent env, but might be further if there
5665 // are any envs created as a result of TypeParameter nodes.
5666 Env<AttrContext> lintEnv = env;
5667 while (lintEnv.info.lint == null)
5668 lintEnv = lintEnv.next;
5669
5670 // Having found the enclosing lint value, we can initialize the lint value for this class
5671 env.info.lint = lintEnv.info.lint.augment(c);
5672
5673 Lint prevLint = chk.setLint(env.info.lint);
5674 JavaFileObject prev = log.useSource(c.sourcefile);
5675 ResultInfo prevReturnRes = env.info.returnResult;
5676
5677 try {
5678 if (c.isSealed() &&
5679 !c.isEnum() &&
5680 !c.isPermittedExplicit &&
5681 c.getPermittedSubclasses().isEmpty()) {
5682 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5683 }
5684
5685 if (c.isSealed()) {
5686 Set<Symbol> permittedTypes = new HashSet<>();
5687 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5688 for (Type subType : c.getPermittedSubclasses()) {
5689 if (subType.isErroneous()) {
5690 // the type already caused errors, don't produce more potentially misleading errors
5691 continue;
5692 }
5693 boolean isTypeVar = false;
5694 if (subType.getTag() == TYPEVAR) {
5695 isTypeVar = true; //error recovery
5696 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5697 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5698 }
5699 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5700 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5701 }
5702 if (permittedTypes.contains(subType.tsym)) {
5703 DiagnosticPosition pos =
5704 env.enclClass.permitting.stream()
5705 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5706 .limit(2).collect(List.collector()).get(1);
5707 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5708 } else {
5709 permittedTypes.add(subType.tsym);
5710 }
5711 if (sealedInUnnamed) {
5712 if (subType.tsym.packge() != c.packge()) {
5713 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5714 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5715 );
5716 }
5717 } else if (subType.tsym.packge().modle != c.packge().modle) {
5718 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5719 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5720 );
5721 }
5722 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5723 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5724 Errors.InvalidPermitsClause(
5725 subType.tsym == c.type.tsym ?
5726 Fragments.MustNotBeSameClass :
5727 Fragments.MustNotBeSupertype(subType)
5728 )
5729 );
5730 } else if (!isTypeVar) {
5731 boolean thisIsASuper = types.directSupertypes(subType)
5732 .stream()
5733 .anyMatch(d -> d.tsym == c);
5734 if (!thisIsASuper) {
5735 if(c.isInterface()) {
5736 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5737 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5738 } else {
5739 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5740 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5741 }
5742 }
5743 }
5744 }
5745 }
5746
5747 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5748 .stream()
5749 .filter(s -> s.tsym.isSealed())
5750 .map(s -> (ClassSymbol) s.tsym)
5751 .collect(List.collector());
5752
5753 if (sealedSupers.isEmpty()) {
5754 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5755 boolean hasErrorSuper = false;
5756
5757 hasErrorSuper |= types.directSupertypes(c.type)
5758 .stream()
5759 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5760
5761 ClassType ct = (ClassType) c.type;
5762
5763 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5764
5765 if (!hasErrorSuper) {
5766 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5767 }
5768 }
5769 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5770 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5771 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5772 }
5773
5774 if (!c.type.isCompound()) {
5775 for (ClassSymbol supertypeSym : sealedSupers) {
5776 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5777 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5778 }
5779 }
5780 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5781 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5782 c.isInterface() ?
5783 Errors.NonSealedOrSealedExpected :
5784 Errors.NonSealedSealedOrFinalExpected);
5785 }
5786 }
5787 }
5788
5789 deferredLintHandler.flush(env.tree, env.info.lint);
5790 env.info.returnResult = null;
5791 // java.lang.Enum may not be subclassed by a non-enum
5792 if (st.tsym == syms.enumSym &&
5793 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5794 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5795
5796 // Enums may not be extended by source-level classes
5797 if (st.tsym != null &&
5798 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5799 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5800 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5801 }
5802
5803 if (rs.isSerializable(c.type)) {
5804 env.info.isSerializable = true;
5805 }
5806
5807 if (c.isValueClass()) {
5808 Assert.check(env.tree.hasTag(CLASSDEF));
5809 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5810 }
5811
5812 attribClassBody(env, c);
5813
5814 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5815 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5816 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5817 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5818
5819 if (c.isImplicit()) {
5820 chk.checkHasMain(env.tree.pos(), c);
5821 }
5822 } finally {
5823 env.info.returnResult = prevReturnRes;
5824 log.useSource(prev);
5825 chk.setLint(prevLint);
5826 }
5827
5828 }
5829 }
5830
5831 public void visitImport(JCImport tree) {
5832 // nothing to do
5833 }
5834
5835 public void visitModuleDef(JCModuleDecl tree) {
5836 tree.sym.completeUsesProvides();
5837 ModuleSymbol msym = tree.sym;
5838 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5839 Lint prevLint = chk.setLint(lint);
5840 chk.checkModuleName(tree);
5841 chk.checkDeprecatedAnnotation(tree, msym);
5842
5843 try {
5844 deferredLintHandler.flush(tree, lint);
5845 } finally {
5846 chk.setLint(prevLint);
5847 }
5848 }
5849
5850 /** Finish the attribution of a class. */
5851 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5852 JCClassDecl tree = (JCClassDecl)env.tree;
5853 Assert.check(c == tree.sym);
5854
5855 // Validate type parameters, supertype and interfaces.
5856 attribStats(tree.typarams, env);
5857 if (!c.isAnonymous()) {
5858 //already checked if anonymous
5859 chk.validate(tree.typarams, env);
5860 chk.validate(tree.extending, env);
5861 chk.validate(tree.implementing, env);
5862 }
5863
5864 chk.checkRequiresIdentity(tree, env.info.lint);
5865
5866 c.markAbstractIfNeeded(types);
5867
5868 // If this is a non-abstract class, check that it has no abstract
5869 // methods or unimplemented methods of an implemented interface.
5870 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5871 chk.checkAllDefined(tree.pos(), c);
5872 }
5873
5874 if ((c.flags() & ANNOTATION) != 0) {
5875 if (tree.implementing.nonEmpty())
5876 log.error(tree.implementing.head.pos(),
5877 Errors.CantExtendIntfAnnotation);
5878 if (tree.typarams.nonEmpty()) {
5879 log.error(tree.typarams.head.pos(),
5880 Errors.IntfAnnotationCantHaveTypeParams(c));
5881 }
5882
5883 // If this annotation type has a @Repeatable, validate
5884 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5885 // If this annotation type has a @Repeatable, validate
5886 if (repeatable != null) {
5887 // get diagnostic position for error reporting
5888 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5889 Assert.checkNonNull(cbPos);
5890
5891 chk.validateRepeatable(c, repeatable, cbPos);
5892 }
5893 } else {
5894 // Check that all extended classes and interfaces
5895 // are compatible (i.e. no two define methods with same arguments
5896 // yet different return types). (JLS 8.4.8.3)
5897 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5898 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5899 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5900 }
5901
5902 // Check that class does not import the same parameterized interface
5903 // with two different argument lists.
5904 chk.checkClassBounds(tree.pos(), c.type);
5905
5906 tree.type = c.type;
5907
5908 for (List<JCTypeParameter> l = tree.typarams;
5909 l.nonEmpty(); l = l.tail) {
5910 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5911 }
5912
5913 // Check that a generic class doesn't extend Throwable
5914 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5915 log.error(tree.extending.pos(), Errors.GenericThrowable);
5916
5917 // Check that all methods which implement some
5918 // method conform to the method they implement.
5919 chk.checkImplementations(tree);
5920
5921 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5922 checkAutoCloseable(tree.pos(), env, c.type);
5923
5924 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5925 // Attribute declaration
5926 attribStat(l.head, env);
5927 // Check that declarations in inner classes are not static (JLS 8.1.2)
5928 // Make an exception for static constants.
5929 if (!allowRecords &&
5930 c.owner.kind != PCK &&
5931 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5932 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5933 VarSymbol sym = null;
5934 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5935 if (sym == null ||
5936 sym.kind != VAR ||
5937 sym.getConstValue() == null)
5938 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5939 }
5940 }
5941
5942 // Check for proper placement of super()/this() calls.
5943 chk.checkSuperInitCalls(tree);
5944
5945 // Check for cycles among non-initial constructors.
5946 chk.checkCyclicConstructors(tree);
5947
5948 // Check for cycles among annotation elements.
5949 chk.checkNonCyclicElements(tree);
5950
5951 // Check for proper use of serialVersionUID and other
5952 // serialization-related fields and methods
5953 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5954 && rs.isSerializable(c.type)
5955 && !c.isAnonymous()) {
5956 chk.checkSerialStructure(env, tree, c);
5957 }
5958 // Correctly organize the positions of the type annotations
5959 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5960
5961 // Check type annotations applicability rules
5962 validateTypeAnnotations(tree, false);
5963 }
5964 // where
5965 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5966 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5967 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5968 if (types.isSameType(al.head.annotationType.type, t))
5969 return al.head.pos();
5970 }
5971
5972 return null;
5973 }
5974
5975 private Type capture(Type type) {
5976 return types.capture(type);
5977 }
5978
5979 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5980 if (type.isErroneous()) {
5981 tree.vartype = make.at(tree.pos()).Erroneous();
5982 } else {
5983 tree.vartype = make.at(tree.pos()).Type(type);
5984 }
5985 }
5986
5987 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5988 tree.accept(new TypeAnnotationsValidator(sigOnly));
5989 }
5990 //where
5991 private final class TypeAnnotationsValidator extends TreeScanner {
5992
5993 private final boolean sigOnly;
5994 public TypeAnnotationsValidator(boolean sigOnly) {
5995 this.sigOnly = sigOnly;
5996 }
5997
5998 public void visitAnnotation(JCAnnotation tree) {
5999 chk.validateTypeAnnotation(tree, null, false);
6000 super.visitAnnotation(tree);
6001 }
6002 public void visitAnnotatedType(JCAnnotatedType tree) {
6003 if (!tree.underlyingType.type.isErroneous()) {
6004 super.visitAnnotatedType(tree);
6005 }
6006 }
6007 public void visitTypeParameter(JCTypeParameter tree) {
6008 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
6009 scan(tree.bounds);
6010 // Don't call super.
6011 // This is needed because above we call validateTypeAnnotation with
6012 // false, which would forbid annotations on type parameters.
6013 // super.visitTypeParameter(tree);
6014 }
6015 public void visitMethodDef(JCMethodDecl tree) {
6016 if (tree.recvparam != null &&
6017 !tree.recvparam.vartype.type.isErroneous()) {
6018 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
6019 }
6020 if (tree.restype != null && tree.restype.type != null) {
6021 validateAnnotatedType(tree.restype, tree.restype.type);
6022 }
6023 if (sigOnly) {
6024 scan(tree.mods);
6025 scan(tree.restype);
6026 scan(tree.typarams);
6027 scan(tree.recvparam);
6028 scan(tree.params);
6029 scan(tree.thrown);
6030 } else {
6031 scan(tree.defaultValue);
6032 scan(tree.body);
6033 }
6034 }
6035 public void visitVarDef(final JCVariableDecl tree) {
6036 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
6037 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
6038 validateAnnotatedType(tree.vartype, tree.sym.type);
6039 scan(tree.mods);
6040 scan(tree.vartype);
6041 if (!sigOnly) {
6042 scan(tree.init);
6043 }
6044 }
6045 public void visitTypeCast(JCTypeCast tree) {
6046 if (tree.clazz != null && tree.clazz.type != null)
6047 validateAnnotatedType(tree.clazz, tree.clazz.type);
6048 super.visitTypeCast(tree);
6049 }
6050 public void visitTypeTest(JCInstanceOf tree) {
6051 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
6052 validateAnnotatedType(tree.pattern, tree.pattern.type);
6053 super.visitTypeTest(tree);
6054 }
6055 public void visitNewClass(JCNewClass tree) {
6056 if (tree.clazz != null && tree.clazz.type != null) {
6057 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
6058 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
6059 tree.clazz.type.tsym);
6060 }
6061 if (tree.def != null) {
6062 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
6063 }
6064
6065 validateAnnotatedType(tree.clazz, tree.clazz.type);
6066 }
6067 super.visitNewClass(tree);
6068 }
6069 public void visitNewArray(JCNewArray tree) {
6070 if (tree.elemtype != null && tree.elemtype.type != null) {
6071 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
6072 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
6073 tree.elemtype.type.tsym);
6074 }
6075 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
6076 }
6077 super.visitNewArray(tree);
6078 }
6079 public void visitClassDef(JCClassDecl tree) {
6080 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
6081 if (sigOnly) {
6082 scan(tree.mods);
6083 scan(tree.typarams);
6084 scan(tree.extending);
6085 scan(tree.implementing);
6086 }
6087 for (JCTree member : tree.defs) {
6088 if (member.hasTag(Tag.CLASSDEF)) {
6089 continue;
6090 }
6091 scan(member);
6092 }
6093 }
6094 public void visitBlock(JCBlock tree) {
6095 if (!sigOnly) {
6096 scan(tree.stats);
6097 }
6098 }
6099
6100 /* I would want to model this after
6101 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
6102 * and override visitSelect and visitTypeApply.
6103 * However, we only set the annotated type in the top-level type
6104 * of the symbol.
6105 * Therefore, we need to override each individual location where a type
6106 * can occur.
6107 */
6108 private void validateAnnotatedType(final JCTree errtree, final Type type) {
6109 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
6110
6111 if (type.isPrimitiveOrVoid()) {
6112 return;
6113 }
6114
6115 JCTree enclTr = errtree;
6116 Type enclTy = type;
6117
6118 boolean repeat = true;
6119 while (repeat) {
6120 if (enclTr.hasTag(TYPEAPPLY)) {
6121 List<Type> tyargs = enclTy.getTypeArguments();
6122 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
6123 if (trargs.length() > 0) {
6124 // Nothing to do for diamonds
6125 if (tyargs.length() == trargs.length()) {
6126 for (int i = 0; i < tyargs.length(); ++i) {
6127 validateAnnotatedType(trargs.get(i), tyargs.get(i));
6128 }
6129 }
6130 // If the lengths don't match, it's either a diamond
6131 // or some nested type that redundantly provides
6132 // type arguments in the tree.
6133 }
6134
6135 // Look at the clazz part of a generic type
6136 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
6137 }
6138
6139 if (enclTr.hasTag(SELECT)) {
6140 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
6141 if (enclTy != null &&
6142 !enclTy.hasTag(NONE)) {
6143 enclTy = enclTy.getEnclosingType();
6144 }
6145 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
6146 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
6147 if (enclTy == null || enclTy.hasTag(NONE)) {
6148 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
6149 for (JCAnnotation an : at.getAnnotations()) {
6150 if (chk.isTypeAnnotation(an, false)) {
6151 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
6152 }
6153 }
6154 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
6155 if (!onlyTypeAnnotations.isEmpty()) {
6156 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
6157 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
6158 Fragments.TypeAnnotation(onlyTypeAnnotations);
6159 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
6160 type.stripMetadata().annotatedType(onlyTypeAnnotations));
6161 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
6162 type.tsym.owner, annotatedType));
6163 }
6164 repeat = false;
6165 }
6166 enclTr = at.underlyingType;
6167 // enclTy doesn't need to be changed
6168 } else if (enclTr.hasTag(IDENT)) {
6169 repeat = false;
6170 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6171 JCWildcard wc = (JCWildcard) enclTr;
6172 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6173 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6174 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6175 } else {
6176 // Nothing to do for UNBOUND
6177 }
6178 repeat = false;
6179 } else if (enclTr.hasTag(TYPEARRAY)) {
6180 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6181 validateAnnotatedType(art.getType(), art.elemtype.type);
6182 repeat = false;
6183 } else if (enclTr.hasTag(TYPEUNION)) {
6184 JCTypeUnion ut = (JCTypeUnion) enclTr;
6185 for (JCTree t : ut.getTypeAlternatives()) {
6186 validateAnnotatedType(t, t.type);
6187 }
6188 repeat = false;
6189 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6190 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6191 for (JCTree t : it.getBounds()) {
6192 validateAnnotatedType(t, t.type);
6193 }
6194 repeat = false;
6195 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6196 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6197 repeat = false;
6198 } else {
6199 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6200 " within: "+ errtree + " with kind: " + errtree.getKind());
6201 }
6202 }
6203 }
6204
6205 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6206 Symbol sym) {
6207 // Ensure that no declaration annotations are present.
6208 // Note that a tree type might be an AnnotatedType with
6209 // empty annotations, if only declaration annotations were given.
6210 // This method will raise an error for such a type.
6211 for (JCAnnotation ai : annotations) {
6212 if (!ai.type.isErroneous() &&
6213 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6214 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6215 }
6216 }
6217 }
6218 }
6219
6220 // <editor-fold desc="post-attribution visitor">
6221
6222 /**
6223 * Handle missing types/symbols in an AST. This routine is useful when
6224 * the compiler has encountered some errors (which might have ended up
6225 * terminating attribution abruptly); if the compiler is used in fail-over
6226 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6227 * prevents NPE to be propagated during subsequent compilation steps.
6228 */
6229 public void postAttr(JCTree tree) {
6230 new PostAttrAnalyzer().scan(tree);
6231 }
6232
6233 class PostAttrAnalyzer extends TreeScanner {
6234
6235 private void initTypeIfNeeded(JCTree that) {
6236 if (that.type == null) {
6237 if (that.hasTag(METHODDEF)) {
6238 that.type = dummyMethodType((JCMethodDecl)that);
6239 } else {
6240 that.type = syms.unknownType;
6241 }
6242 }
6243 }
6244
6245 /* Construct a dummy method type. If we have a method declaration,
6246 * and the declared return type is void, then use that return type
6247 * instead of UNKNOWN to avoid spurious error messages in lambda
6248 * bodies (see:JDK-8041704).
6249 */
6250 private Type dummyMethodType(JCMethodDecl md) {
6251 Type restype = syms.unknownType;
6252 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6253 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6254 if (prim.typetag == VOID)
6255 restype = syms.voidType;
6256 }
6257 return new MethodType(List.nil(), restype,
6258 List.nil(), syms.methodClass);
6259 }
6260 private Type dummyMethodType() {
6261 return dummyMethodType(null);
6262 }
6263
6264 @Override
6265 public void scan(JCTree tree) {
6266 if (tree == null) return;
6267 if (tree instanceof JCExpression) {
6268 initTypeIfNeeded(tree);
6269 }
6270 super.scan(tree);
6271 }
6272
6273 @Override
6274 public void visitIdent(JCIdent that) {
6275 if (that.sym == null) {
6276 that.sym = syms.unknownSymbol;
6277 }
6278 }
6279
6280 @Override
6281 public void visitSelect(JCFieldAccess that) {
6282 if (that.sym == null) {
6283 that.sym = syms.unknownSymbol;
6284 }
6285 super.visitSelect(that);
6286 }
6287
6288 @Override
6289 public void visitClassDef(JCClassDecl that) {
6290 initTypeIfNeeded(that);
6291 if (that.sym == null) {
6292 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6293 }
6294 super.visitClassDef(that);
6295 }
6296
6297 @Override
6298 public void visitMethodDef(JCMethodDecl that) {
6299 initTypeIfNeeded(that);
6300 if (that.sym == null) {
6301 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6302 }
6303 super.visitMethodDef(that);
6304 }
6305
6306 @Override
6307 public void visitVarDef(JCVariableDecl that) {
6308 initTypeIfNeeded(that);
6309 if (that.sym == null) {
6310 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6311 that.sym.adr = 0;
6312 }
6313 if (that.vartype == null) {
6314 that.vartype = make.at(Position.NOPOS).Erroneous();
6315 }
6316 super.visitVarDef(that);
6317 }
6318
6319 @Override
6320 public void visitBindingPattern(JCBindingPattern that) {
6321 initTypeIfNeeded(that);
6322 initTypeIfNeeded(that.var);
6323 if (that.var.sym == null) {
6324 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6325 that.var.sym.adr = 0;
6326 }
6327 super.visitBindingPattern(that);
6328 }
6329
6330 @Override
6331 public void visitRecordPattern(JCRecordPattern that) {
6332 initTypeIfNeeded(that);
6333 if (that.record == null) {
6334 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6335 that.type, syms.noSymbol);
6336 }
6337 if (that.fullComponentTypes == null) {
6338 that.fullComponentTypes = List.nil();
6339 }
6340 super.visitRecordPattern(that);
6341 }
6342
6343 @Override
6344 public void visitNewClass(JCNewClass that) {
6345 if (that.constructor == null) {
6346 that.constructor = new MethodSymbol(0, names.init,
6347 dummyMethodType(), syms.noSymbol);
6348 }
6349 if (that.constructorType == null) {
6350 that.constructorType = syms.unknownType;
6351 }
6352 super.visitNewClass(that);
6353 }
6354
6355 @Override
6356 public void visitAssignop(JCAssignOp that) {
6357 if (that.operator == null) {
6358 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6359 -1, syms.noSymbol);
6360 }
6361 super.visitAssignop(that);
6362 }
6363
6364 @Override
6365 public void visitBinary(JCBinary that) {
6366 if (that.operator == null) {
6367 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6368 -1, syms.noSymbol);
6369 }
6370 super.visitBinary(that);
6371 }
6372
6373 @Override
6374 public void visitUnary(JCUnary that) {
6375 if (that.operator == null) {
6376 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6377 -1, syms.noSymbol);
6378 }
6379 super.visitUnary(that);
6380 }
6381
6382 @Override
6383 public void visitReference(JCMemberReference that) {
6384 super.visitReference(that);
6385 if (that.sym == null) {
6386 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6387 syms.noSymbol);
6388 }
6389 }
6390 }
6391 // </editor-fold>
6392
6393 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6394 new TreeScanner() {
6395 Symbol packge = pkg;
6396 @Override
6397 public void visitIdent(JCIdent that) {
6398 that.sym = packge;
6399 }
6400
6401 @Override
6402 public void visitSelect(JCFieldAccess that) {
6403 that.sym = packge;
6404 packge = packge.owner;
6405 super.visitSelect(that);
6406 }
6407 }.scan(pid);
6408 }
6409
6410 }