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 currentClassSym = localEnv.enclClass.sym;
1273 }
1274
1275 boolean insideLambdaOrClassDef = false;
1276
1277 @Override
1278 public void visitLambda(JCLambda lambda) {
1279 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1280 try {
1281 insideLambdaOrClassDef = true;
1282 super.visitLambda(lambda);
1283 } finally {
1284 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1285 }
1286 }
1287
1288 ClassSymbol currentClassSym;
1289
1290 @Override
1291 public void visitClassDef(JCClassDecl classDecl) {
1292 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1293 ClassSymbol previousClassSym = currentClassSym;
1294 try {
1295 insideLambdaOrClassDef = true;
1296 currentClassSym = classDecl.sym;
1297 super.visitClassDef(classDecl);
1298 } finally {
1299 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1300 currentClassSym = previousClassSym;
1301 }
1302 }
1303
1304 private void reportPrologueError(JCTree tree, Symbol sym) {
1305 preview.checkSourceLevel(tree, Feature.FLEXIBLE_CONSTRUCTORS);
1306 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1307 }
1308
1309 @Override
1310 public void visitApply(JCMethodInvocation tree) {
1311 super.visitApply(tree);
1312 Name name = TreeInfo.name(tree.meth);
1313 boolean isConstructorCall = name == names._this || name == names._super;
1314 Symbol msym = TreeInfo.symbolFor(tree.meth);
1315 // is this an instance method call or an illegal constructor invocation like: `this.super()`?
1316 if (msym != null && // for erroneous invocations msym can be null, ignore those
1317 (!isConstructorCall ||
1318 isConstructorCall && tree.meth.hasTag(SELECT))) {
1319 if (isEarlyReference(localEnv, tree.meth, msym))
1320 reportPrologueError(tree.meth, msym);
1321 }
1322 }
1323
1324 @Override
1325 public void visitIdent(JCIdent tree) {
1326 analyzeSymbol(tree);
1327 }
1328
1329 @Override
1330 public void visitSelect(JCFieldAccess tree) {
1331 SelectScanner ss = new SelectScanner();
1332 ss.scan(tree);
1333 if (ss.scanLater == null) {
1334 analyzeSymbol(tree);
1335 } else {
1336 boolean prevLhs = isInLHS;
1337 try {
1338 isInLHS = false;
1339 scan(ss.scanLater);
1340 } finally {
1341 isInLHS = prevLhs;
1342 }
1343 }
1344 }
1345
1346 @Override
1347 public void visitNewClass(JCNewClass tree) {
1348 super.visitNewClass(tree);
1349 checkNewClassAndMethRefs(tree, tree.type);
1350 }
1351
1352 @Override
1353 public void visitReference(JCMemberReference tree) {
1354 super.visitReference(tree);
1355 if (tree.getMode() == JCMemberReference.ReferenceMode.NEW) {
1356 checkNewClassAndMethRefs(tree, tree.expr.type);
1357 }
1358 }
1359
1360 void checkNewClassAndMethRefs(JCTree tree, Type t) {
1361 if (t.tsym.isEnclosedBy(localEnv.enclClass.sym) &&
1362 !t.tsym.isStatic() &&
1363 !t.tsym.isDirectlyOrIndirectlyLocal()) {
1364 reportPrologueError(tree, t.getEnclosingType().tsym);
1365 }
1366 }
1367
1368 /* if a symbol is in the LHS of an assignment expression we won't consider it as a candidate
1369 * for a proxy local variable later on
1370 */
1371 boolean isInLHS = false;
1372
1373 @Override
1374 public void visitAssign(JCAssign tree) {
1375 boolean previousIsInLHS = isInLHS;
1376 try {
1377 isInLHS = true;
1378 scan(tree.lhs);
1379 } finally {
1380 isInLHS = previousIsInLHS;
1381 }
1382 scan(tree.rhs);
1383 }
1384
1385 @Override
1386 public void visitMethodDef(JCMethodDecl tree) {
1387 // ignore any declarative part, mainly to avoid scanning receiver parameters
1388 scan(tree.body);
1389 }
1390
1391 void analyzeSymbol(JCTree tree) {
1392 Symbol sym = TreeInfo.symbolFor(tree);
1393 // make sure that there is a symbol and it is not static
1394 if (sym == null || sym.isStatic()) {
1395 return;
1396 }
1397 if (isInLHS && !insideLambdaOrClassDef) {
1398 // Check instance field assignments that appear in constructor prologues
1399 if (isEarlyReference(localEnv, tree, sym)) {
1400 // Field may not be inherited from a superclass
1401 if (sym.owner != localEnv.enclClass.sym) {
1402 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1403 return;
1404 }
1405 // Field may not have an initializer
1406 if ((sym.flags() & HASINIT) != 0) {
1407 log.error(tree, Errors.CantAssignInitializedBeforeCtorCalled(sym));
1408 return;
1409 }
1410 }
1411 return;
1412 }
1413 tree = TreeInfo.skipParens(tree);
1414 if (sym.kind == VAR && sym.owner.kind == TYP) {
1415 if (sym.name == names._this || sym.name == names._super) {
1416 // are we seeing something like `this` or `CurrentClass.this` or `SuperClass.super::foo`?
1417 if (TreeInfo.isExplicitThisReference(
1418 types,
1419 (ClassType)localEnv.enclClass.sym.type,
1420 tree)) {
1421 reportPrologueError(tree, sym);
1422 }
1423 } else if (sym.kind == VAR && sym.owner.kind == TYP) { // now fields only
1424 if (sym.owner != localEnv.enclClass.sym) {
1425 if (localEnv.enclClass.sym.isSubClass(sym.owner, types) &&
1426 sym.isInheritedIn(localEnv.enclClass.sym, types)) {
1427 /* if we are dealing with a field that doesn't belong to the current class, but the
1428 * field is inherited, this is an error. Unless, the super class is also an outer
1429 * class and the field's qualifier refers to the outer class
1430 */
1431 if (tree.hasTag(IDENT) ||
1432 TreeInfo.isExplicitThisReference(
1433 types,
1434 (ClassType)localEnv.enclClass.sym.type,
1435 ((JCFieldAccess)tree).selected)) {
1436 reportPrologueError(tree, sym);
1437 }
1438 }
1439 } else if (isEarlyReference(localEnv, tree, sym)) {
1440 /* now this is a `proper` instance field of the current class
1441 * references to fields of identity classes which happen to have initializers are
1442 * not allowed in the prologue
1443 */
1444 if (insideLambdaOrClassDef ||
1445 (!localEnv.enclClass.sym.isValueClass() && (sym.flags_field & HASINIT) != 0))
1446 reportPrologueError(tree, sym);
1447 // we will need to generate a proxy for this field later on
1448 if (!isInLHS) {
1449 if (allowValueClasses) {
1450 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, sym);
1451 } else {
1452 reportPrologueError(tree, sym);
1453 }
1454 }
1455 }
1456 }
1457 }
1458 }
1459
1460 /**
1461 * Determine if the symbol appearance constitutes an early reference to the current class.
1462 *
1463 * <p>
1464 * This means the symbol is an instance field, or method, of the current class and it appears
1465 * in an early initialization context of it (i.e., one of its constructor prologues).
1466 *
1467 * @param env The current environment
1468 * @param tree the AST referencing the variable
1469 * @param sym The symbol
1470 */
1471 private boolean isEarlyReference(Env<AttrContext> env, JCTree tree, Symbol sym) {
1472 if ((sym.flags() & STATIC) == 0 &&
1473 (sym.kind == VAR || sym.kind == MTH) &&
1474 sym.isMemberOf(env.enclClass.sym, types)) {
1475 // Allow "Foo.this.x" when "Foo" is (also) an outer class, as this refers to the outer instance
1476 if (tree instanceof JCFieldAccess fa) {
1477 return TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, fa.selected);
1478 } else if (currentClassSym != env.enclClass.sym) {
1479 /* so we are inside a class, CI, in the prologue of an outer class, CO, and the symbol being
1480 * analyzed has no qualifier. So if the symbol is a member of CI the reference is allowed,
1481 * otherwise it is not.
1482 * It could be that the reference to CI's member happens inside CI's own prologue, but that
1483 * will be checked separately, when CI's prologue is analyzed.
1484 */
1485 return !sym.isMemberOf(currentClassSym, types);
1486 }
1487 return true;
1488 }
1489 return false;
1490 }
1491
1492 /* scanner for a select expression, anything that is not a select or identifier
1493 * will be stored for further analysis
1494 */
1495 class SelectScanner extends DeferredAttr.FilterScanner {
1496 JCTree scanLater;
1497
1498 SelectScanner() {
1499 super(Set.of(IDENT, SELECT, PARENS));
1500 }
1501
1502 @Override
1503 void skip(JCTree tree) {
1504 scanLater = tree;
1505 }
1506 }
1507 }
1508
1509 public void visitVarDef(JCVariableDecl tree) {
1510 // Local variables have not been entered yet, so we need to do it now:
1511 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1512 if (tree.sym != null) {
1513 // parameters have already been entered
1514 env.info.scope.enter(tree.sym);
1515 } else {
1516 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1517 if (tree.init == null) {
1518 //cannot use 'var' without initializer
1519 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1520 tree.vartype = make.Erroneous();
1521 } else {
1522 Fragment msg = canInferLocalVarType(tree);
1523 if (msg != null) {
1524 //cannot use 'var' with initializer which require an explicit target
1525 //(e.g. lambda, method reference, array initializer).
1526 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1527 tree.vartype = make.Erroneous();
1528 }
1529 }
1530 }
1531 try {
1532 annotate.blockAnnotations();
1533 memberEnter.memberEnter(tree, env);
1534 } finally {
1535 annotate.unblockAnnotations();
1536 }
1537 }
1538 } else {
1539 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1540 }
1541
1542 VarSymbol v = tree.sym;
1543 Lint lint = env.info.lint.augment(v);
1544 Lint prevLint = chk.setLint(lint);
1545
1546 // Check that the variable's declared type is well-formed.
1547 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1548 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1549 (tree.sym.flags() & PARAMETER) != 0;
1550 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1551
1552 try {
1553 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1554 deferredLintHandler.flush(tree, lint);
1555 chk.checkDeprecatedAnnotation(tree.pos(), v);
1556
1557 if (tree.init != null) {
1558 if ((v.flags_field & FINAL) == 0 ||
1559 !memberEnter.needsLazyConstValue(tree.init)) {
1560 // Not a compile-time constant
1561 // Attribute initializer in a new environment
1562 // with the declared variable as owner.
1563 // Check that initializer conforms to variable's declared type.
1564 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1565 initEnv.info.lint = lint;
1566 // In order to catch self-references, we set the variable's
1567 // declaration position to maximal possible value, effectively
1568 // marking the variable as undefined.
1569 initEnv.info.enclVar = v;
1570 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1571 try {
1572 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1573 // strict instance initializer in a value class
1574 initEnv.info.ctorPrologue = true;
1575 }
1576 attribExpr(tree.init, initEnv, v.type);
1577 if (tree.isImplicitlyTyped()) {
1578 //fixup local variable type
1579 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1580 }
1581 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1582 // strict field initializers are inlined in constructor's prologues
1583 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(initEnv);
1584 ctorPrologueVisitor.scan(tree.init);
1585 }
1586 } finally {
1587 initEnv.info.ctorPrologue = previousCtorPrologue;
1588 }
1589 }
1590 if (tree.isImplicitlyTyped()) {
1591 setSyntheticVariableType(tree, v.type);
1592 }
1593 }
1594 result = tree.type = v.type;
1595 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1596 if (isNonArgsMethodInObject(v.name)) {
1597 log.error(tree, Errors.IllegalRecordComponentName(v));
1598 }
1599 }
1600 chk.checkRequiresIdentity(tree, env.info.lint);
1601 }
1602 finally {
1603 chk.setLint(prevLint);
1604 }
1605 }
1606
1607 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1608 if (tree.init != null &&
1609 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1610 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1611 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1612 // Field initializer expression need to be entered.
1613 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree);
1614 annotate.flush();
1615 }
1616 }
1617
1618 private boolean isNonArgsMethodInObject(Name name) {
1619 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1620 if (s.type.getParameterTypes().isEmpty()) {
1621 return true;
1622 }
1623 }
1624 return false;
1625 }
1626
1627 Fragment canInferLocalVarType(JCVariableDecl tree) {
1628 LocalInitScanner lis = new LocalInitScanner();
1629 lis.scan(tree.init);
1630 return lis.badInferenceMsg;
1631 }
1632
1633 static class LocalInitScanner extends TreeScanner {
1634 Fragment badInferenceMsg = null;
1635 boolean needsTarget = true;
1636
1637 @Override
1638 public void visitNewArray(JCNewArray tree) {
1639 if (tree.elemtype == null && needsTarget) {
1640 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1641 }
1642 }
1643
1644 @Override
1645 public void visitLambda(JCLambda tree) {
1646 if (needsTarget) {
1647 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1648 }
1649 }
1650
1651 @Override
1652 public void visitTypeCast(JCTypeCast tree) {
1653 boolean prevNeedsTarget = needsTarget;
1654 try {
1655 needsTarget = false;
1656 super.visitTypeCast(tree);
1657 } finally {
1658 needsTarget = prevNeedsTarget;
1659 }
1660 }
1661
1662 @Override
1663 public void visitReference(JCMemberReference tree) {
1664 if (needsTarget) {
1665 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1666 }
1667 }
1668
1669 @Override
1670 public void visitNewClass(JCNewClass tree) {
1671 boolean prevNeedsTarget = needsTarget;
1672 try {
1673 needsTarget = false;
1674 super.visitNewClass(tree);
1675 } finally {
1676 needsTarget = prevNeedsTarget;
1677 }
1678 }
1679
1680 @Override
1681 public void visitApply(JCMethodInvocation tree) {
1682 boolean prevNeedsTarget = needsTarget;
1683 try {
1684 needsTarget = false;
1685 super.visitApply(tree);
1686 } finally {
1687 needsTarget = prevNeedsTarget;
1688 }
1689 }
1690 }
1691
1692 public void visitSkip(JCSkip tree) {
1693 result = null;
1694 }
1695
1696 public void visitBlock(JCBlock tree) {
1697 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1698 // Block is a static or instance initializer;
1699 // let the owner of the environment be a freshly
1700 // created BLOCK-method.
1701 Symbol fakeOwner =
1702 new MethodSymbol(tree.flags | BLOCK |
1703 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1704 env.info.scope.owner);
1705 final Env<AttrContext> localEnv =
1706 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1707
1708 if ((tree.flags & STATIC) != 0) {
1709 localEnv.info.staticLevel++;
1710 } else {
1711 localEnv.info.instanceInitializerBlock = true;
1712 }
1713 // Attribute all type annotations in the block
1714 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1715 annotate.flush();
1716 attribStats(tree.stats, localEnv);
1717
1718 {
1719 // Store init and clinit type annotations with the ClassSymbol
1720 // to allow output in Gen.normalizeDefs.
1721 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1722 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1723 if ((tree.flags & STATIC) != 0) {
1724 cs.appendClassInitTypeAttributes(tas);
1725 } else {
1726 cs.appendInitTypeAttributes(tas);
1727 }
1728 }
1729 } else {
1730 // Create a new local environment with a local scope.
1731 Env<AttrContext> localEnv =
1732 env.dup(tree, env.info.dup(env.info.scope.dup()));
1733 try {
1734 attribStats(tree.stats, localEnv);
1735 } finally {
1736 localEnv.info.scope.leave();
1737 }
1738 }
1739 result = null;
1740 }
1741
1742 public void visitDoLoop(JCDoWhileLoop tree) {
1743 attribStat(tree.body, env.dup(tree));
1744 attribExpr(tree.cond, env, syms.booleanType);
1745 handleLoopConditionBindings(matchBindings, tree, tree.body);
1746 result = null;
1747 }
1748
1749 public void visitWhileLoop(JCWhileLoop tree) {
1750 attribExpr(tree.cond, env, syms.booleanType);
1751 MatchBindings condBindings = matchBindings;
1752 // include condition's bindings when true in the body:
1753 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1754 try {
1755 attribStat(tree.body, whileEnv.dup(tree));
1756 } finally {
1757 whileEnv.info.scope.leave();
1758 }
1759 handleLoopConditionBindings(condBindings, tree, tree.body);
1760 result = null;
1761 }
1762
1763 public void visitForLoop(JCForLoop tree) {
1764 Env<AttrContext> loopEnv =
1765 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1766 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1767 try {
1768 attribStats(tree.init, loopEnv);
1769 if (tree.cond != null) {
1770 attribExpr(tree.cond, loopEnv, syms.booleanType);
1771 // include condition's bindings when true in the body and step:
1772 condBindings = matchBindings;
1773 }
1774 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1775 try {
1776 bodyEnv.tree = tree; // before, we were not in loop!
1777 attribStats(tree.step, bodyEnv);
1778 attribStat(tree.body, bodyEnv);
1779 } finally {
1780 bodyEnv.info.scope.leave();
1781 }
1782 result = null;
1783 }
1784 finally {
1785 loopEnv.info.scope.leave();
1786 }
1787 handleLoopConditionBindings(condBindings, tree, tree.body);
1788 }
1789
1790 /**
1791 * Include condition's bindings when false after the loop, if cannot get out of the loop
1792 */
1793 private void handleLoopConditionBindings(MatchBindings condBindings,
1794 JCStatement loop,
1795 JCStatement loopBody) {
1796 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1797 !breaksTo(env, loop, loopBody)) {
1798 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1799 }
1800 }
1801
1802 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1803 preFlow(body);
1804 return flow.breaksToTree(env, loop, body, make);
1805 }
1806
1807 /**
1808 * Add given bindings to the current scope, unless there's a break to
1809 * an immediately enclosing labeled statement.
1810 */
1811 private void addBindings2Scope(JCStatement introducingStatement,
1812 List<BindingSymbol> bindings) {
1813 if (bindings.isEmpty()) {
1814 return ;
1815 }
1816
1817 var searchEnv = env;
1818 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1819 labeled.body == introducingStatement) {
1820 if (breaksTo(env, labeled, labeled.body)) {
1821 //breaking to an immediately enclosing labeled statement
1822 return ;
1823 }
1824 searchEnv = searchEnv.next;
1825 introducingStatement = labeled;
1826 }
1827
1828 //include condition's body when false after the while, if cannot get out of the loop
1829 bindings.forEach(env.info.scope::enter);
1830 bindings.forEach(BindingSymbol::preserveBinding);
1831 }
1832
1833 public void visitForeachLoop(JCEnhancedForLoop tree) {
1834 Env<AttrContext> loopEnv =
1835 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1836 try {
1837 //the Formal Parameter of a for-each loop is not in the scope when
1838 //attributing the for-each expression; we mimic this by attributing
1839 //the for-each expression first (against original scope).
1840 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1841 chk.checkNonVoid(tree.pos(), exprType);
1842 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1843 if (elemtype == null) {
1844 // or perhaps expr implements Iterable<T>?
1845 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1846 if (base == null) {
1847 log.error(tree.expr.pos(),
1848 Errors.ForeachNotApplicableToType(exprType,
1849 Fragments.TypeReqArrayOrIterable));
1850 elemtype = types.createErrorType(exprType);
1851 } else {
1852 List<Type> iterableParams = base.allparams();
1853 elemtype = iterableParams.isEmpty()
1854 ? syms.objectType
1855 : types.wildUpperBound(iterableParams.head);
1856
1857 // Check the return type of the method iterator().
1858 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1859 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1860 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1861 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1862 log.error(tree.pos(),
1863 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1864 }
1865 }
1866 }
1867 if (tree.var.isImplicitlyTyped()) {
1868 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1869 setSyntheticVariableType(tree.var, inferredType);
1870 }
1871 attribStat(tree.var, loopEnv);
1872 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1873 loopEnv.tree = tree; // before, we were not in loop!
1874 attribStat(tree.body, loopEnv);
1875 result = null;
1876 }
1877 finally {
1878 loopEnv.info.scope.leave();
1879 }
1880 }
1881
1882 public void visitLabelled(JCLabeledStatement tree) {
1883 // Check that label is not used in an enclosing statement
1884 Env<AttrContext> env1 = env;
1885 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1886 if (env1.tree.hasTag(LABELLED) &&
1887 ((JCLabeledStatement) env1.tree).label == tree.label) {
1888 log.error(tree.pos(),
1889 Errors.LabelAlreadyInUse(tree.label));
1890 break;
1891 }
1892 env1 = env1.next;
1893 }
1894
1895 attribStat(tree.body, env.dup(tree));
1896 result = null;
1897 }
1898
1899 public void visitSwitch(JCSwitch tree) {
1900 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1901 attribStats(c.stats, caseEnv);
1902 });
1903 result = null;
1904 }
1905
1906 public void visitSwitchExpression(JCSwitchExpression tree) {
1907 boolean wrongContext = false;
1908
1909 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1910 PolyKind.STANDALONE : PolyKind.POLY;
1911
1912 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1913 //this means we are returning a poly conditional from void-compatible lambda expression
1914 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1915 resultInfo = recoveryInfo;
1916 wrongContext = true;
1917 }
1918
1919 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1920 unknownExprInfo :
1921 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1922
1923 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1924 ListBuffer<Type> caseTypes = new ListBuffer<>();
1925
1926 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1927 caseEnv.info.yieldResult = condInfo;
1928 attribStats(c.stats, caseEnv);
1929 new TreeScanner() {
1930 @Override
1931 public void visitYield(JCYield brk) {
1932 if (brk.target == tree) {
1933 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1934 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1935 }
1936 super.visitYield(brk);
1937 }
1938
1939 @Override public void visitClassDef(JCClassDecl tree) {}
1940 @Override public void visitLambda(JCLambda tree) {}
1941 }.scan(c.stats);
1942 });
1943
1944 if (tree.cases.isEmpty()) {
1945 log.error(tree.pos(),
1946 Errors.SwitchExpressionEmpty);
1947 } else if (caseTypes.isEmpty()) {
1948 log.error(tree.pos(),
1949 Errors.SwitchExpressionNoResultExpressions);
1950 }
1951
1952 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1953
1954 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1955 }
1956 //where:
1957 CheckContext switchExpressionContext(CheckContext checkContext) {
1958 return new Check.NestedCheckContext(checkContext) {
1959 //this will use enclosing check context to check compatibility of
1960 //subexpression against target type; if we are in a method check context,
1961 //depending on whether boxing is allowed, we could have incompatibilities
1962 @Override
1963 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1964 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1965 }
1966 };
1967 }
1968
1969 private void handleSwitch(JCTree switchTree,
1970 JCExpression selector,
1971 List<JCCase> cases,
1972 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1973 Type seltype = attribExpr(selector, env);
1974 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
1975
1976 Env<AttrContext> switchEnv =
1977 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1978
1979 try {
1980 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1981 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1982 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
1983 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1984 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1985 boolean patternSwitch;
1986 if (seltype.isPrimitive() && !intSwitch) {
1987 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1988 patternSwitch = true;
1989 }
1990 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1991 !intSwitch) {
1992 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1993 patternSwitch = true;
1994 } else {
1995 patternSwitch = cases.stream()
1996 .flatMap(c -> c.labels.stream())
1997 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1998 TreeInfo.isNullCaseLabel(l));
1999 }
2000
2001 // Attribute all cases and
2002 // check that there are no duplicate case labels or default clauses.
2003 Set<Object> constants = new HashSet<>(); // The set of case constants.
2004 boolean hasDefault = false; // Is there a default label?
2005 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
2006 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
2007 boolean hasNullPattern = false; // Is there a null pattern?
2008 CaseTree.CaseKind caseKind = null;
2009 boolean wasError = false;
2010 JCCaseLabel unconditionalCaseLabel = null;
2011 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
2012 JCCase c = l.head;
2013 if (caseKind == null) {
2014 caseKind = c.caseKind;
2015 } else if (caseKind != c.caseKind && !wasError) {
2016 log.error(c.pos(),
2017 Errors.SwitchMixingCaseTypes);
2018 wasError = true;
2019 }
2020 MatchBindings currentBindings = null;
2021 MatchBindings guardBindings = null;
2022 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
2023 JCCaseLabel label = labels.head;
2024 if (label instanceof JCConstantCaseLabel constLabel) {
2025 JCExpression expr = constLabel.expr;
2026 if (TreeInfo.isNull(expr)) {
2027 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
2028 if (hasNullPattern) {
2029 log.error(label.pos(), Errors.DuplicateCaseLabel);
2030 }
2031 hasNullPattern = true;
2032 attribExpr(expr, switchEnv, seltype);
2033 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
2034 } else if (enumSwitch) {
2035 Symbol sym = enumConstant(expr, seltype);
2036 if (sym == null) {
2037 if (allowPatternSwitch) {
2038 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2039 Symbol enumSym = TreeInfo.symbol(expr);
2040 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
2041 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
2042 } else if (!constants.add(enumSym)) {
2043 log.error(label.pos(), Errors.DuplicateCaseLabel);
2044 }
2045 } else {
2046 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
2047 }
2048 } else if (!constants.add(sym)) {
2049 log.error(label.pos(), Errors.DuplicateCaseLabel);
2050 }
2051 } else if (errorEnumSwitch) {
2052 //error recovery: the selector is erroneous, and all the case labels
2053 //are identifiers. This could be an enum switch - don't report resolve
2054 //error for the case label:
2055 var prevResolveHelper = rs.basicLogResolveHelper;
2056 try {
2057 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
2058 attribExpr(expr, switchEnv, seltype);
2059 } finally {
2060 rs.basicLogResolveHelper = prevResolveHelper;
2061 }
2062 } else {
2063 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2064 if (!pattype.hasTag(ERROR)) {
2065 if (pattype.constValue() == null) {
2066 Symbol s = TreeInfo.symbol(expr);
2067 if (s != null && s.kind == TYP) {
2068 log.error(expr.pos(),
2069 Errors.PatternExpected);
2070 } else if (s == null || !s.isEnum()) {
2071 log.error(expr.pos(),
2072 (stringSwitch ? Errors.StringConstReq
2073 : intSwitch ? Errors.ConstExprReq
2074 : Errors.PatternOrEnumReq));
2075 } else if (!constants.add(s)) {
2076 log.error(label.pos(), Errors.DuplicateCaseLabel);
2077 }
2078 }
2079 else {
2080 boolean isLongFloatDoubleOrBooleanConstant =
2081 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
2082 if (isLongFloatDoubleOrBooleanConstant) {
2083 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
2084 }
2085 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
2086 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
2087 } else if (!constants.add(pattype.constValue())) {
2088 log.error(c.pos(), Errors.DuplicateCaseLabel);
2089 }
2090 }
2091 }
2092 }
2093 } else if (label instanceof JCDefaultCaseLabel def) {
2094 if (hasDefault) {
2095 log.error(label.pos(), Errors.DuplicateDefaultLabel);
2096 } else if (hasUnconditionalPattern) {
2097 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
2098 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2099 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
2100 }
2101 hasDefault = true;
2102 matchBindings = MatchBindingsComputer.EMPTY;
2103 } else if (label instanceof JCPatternCaseLabel patternlabel) {
2104 //pattern
2105 JCPattern pat = patternlabel.pat;
2106 attribExpr(pat, switchEnv, seltype);
2107 Type primaryType = TreeInfo.primaryPatternType(pat);
2108
2109 if (primaryType.isPrimitive()) {
2110 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
2111 } else if (!primaryType.hasTag(TYPEVAR)) {
2112 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
2113 }
2114 checkCastablePattern(pat.pos(), seltype, primaryType);
2115 Type patternType = types.erasure(primaryType);
2116 JCExpression guard = c.guard;
2117 if (guardBindings == null && guard != null) {
2118 MatchBindings afterPattern = matchBindings;
2119 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
2120 try {
2121 attribExpr(guard, bodyEnv, syms.booleanType);
2122 } finally {
2123 bodyEnv.info.scope.leave();
2124 }
2125
2126 guardBindings = matchBindings;
2127 matchBindings = afterPattern;
2128
2129 if (TreeInfo.isBooleanWithValue(guard, 0)) {
2130 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
2131 }
2132 }
2133 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
2134 boolean unconditional =
2135 unguarded &&
2136 !patternType.isErroneous() &&
2137 types.isUnconditionallyExact(seltype, patternType);
2138 if (unconditional) {
2139 if (hasUnconditionalPattern) {
2140 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
2141 } else if (hasDefault) {
2142 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
2143 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2144 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
2145 }
2146 hasUnconditionalPattern = true;
2147 unconditionalCaseLabel = label;
2148 }
2149 lastPatternErroneous = patternType.isErroneous();
2150 } else {
2151 Assert.error();
2152 }
2153 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
2154 }
2155
2156 if (guardBindings != null) {
2157 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
2158 }
2159
2160 Env<AttrContext> caseEnv =
2161 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
2162 try {
2163 attribCase.accept(c, caseEnv);
2164 } finally {
2165 caseEnv.info.scope.leave();
2166 }
2167 addVars(c.stats, switchEnv.info.scope);
2168
2169 preFlow(c);
2170 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
2171 }
2172 if (patternSwitch) {
2173 chk.checkSwitchCaseStructure(cases);
2174 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
2175 }
2176 if (switchTree.hasTag(SWITCH)) {
2177 ((JCSwitch) switchTree).hasUnconditionalPattern =
2178 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2179 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
2180 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
2181 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
2182 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2183 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
2184 } else {
2185 Assert.error(switchTree.getTag().name());
2186 }
2187 } finally {
2188 switchEnv.info.scope.leave();
2189 }
2190 }
2191 // where
2192 private ResultInfo caseLabelResultInfo(Type seltype) {
2193 return new ResultInfo(KindSelector.VAL_TYP,
2194 !seltype.hasTag(ERROR) ? seltype
2195 : Type.noType);
2196 }
2197 /** Add any variables defined in stats to the switch scope. */
2198 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
2199 for (;stats.nonEmpty(); stats = stats.tail) {
2200 JCTree stat = stats.head;
2201 if (stat.hasTag(VARDEF))
2202 switchScope.enter(((JCVariableDecl) stat).sym);
2203 }
2204 }
2205 // where
2206 /** Return the selected enumeration constant symbol, or null. */
2207 private Symbol enumConstant(JCTree tree, Type enumType) {
2208 if (tree.hasTag(IDENT)) {
2209 JCIdent ident = (JCIdent)tree;
2210 Name name = ident.name;
2211 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
2212 if (sym.kind == VAR) {
2213 Symbol s = ident.sym = sym;
2214 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
2215 ident.type = s.type;
2216 return ((s.flags_field & Flags.ENUM) == 0)
2217 ? null : s;
2218 }
2219 }
2220 }
2221 return null;
2222 }
2223
2224 public void visitSynchronized(JCSynchronized tree) {
2225 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
2226 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
2227 env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
2228 }
2229 attribStat(tree.body, env);
2230 result = null;
2231 }
2232
2233 public void visitTry(JCTry tree) {
2234 // Create a new local environment with a local
2235 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
2236 try {
2237 boolean isTryWithResource = tree.resources.nonEmpty();
2238 // Create a nested environment for attributing the try block if needed
2239 Env<AttrContext> tryEnv = isTryWithResource ?
2240 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2241 localEnv;
2242 try {
2243 // Attribute resource declarations
2244 for (JCTree resource : tree.resources) {
2245 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
2246 @Override
2247 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2248 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
2249 }
2250 };
2251 ResultInfo twrResult =
2252 new ResultInfo(KindSelector.VAR,
2253 syms.autoCloseableType,
2254 twrContext);
2255 if (resource.hasTag(VARDEF)) {
2256 attribStat(resource, tryEnv);
2257 twrResult.check(resource, resource.type);
2258
2259 //check that resource type cannot throw InterruptedException
2260 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2261
2262 VarSymbol var = ((JCVariableDecl) resource).sym;
2263
2264 var.flags_field |= Flags.FINAL;
2265 var.setData(ElementKind.RESOURCE_VARIABLE);
2266 } else {
2267 attribTree(resource, tryEnv, twrResult);
2268 }
2269 }
2270 // Attribute body
2271 attribStat(tree.body, tryEnv);
2272 } finally {
2273 if (isTryWithResource)
2274 tryEnv.info.scope.leave();
2275 }
2276
2277 // Attribute catch clauses
2278 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2279 JCCatch c = l.head;
2280 Env<AttrContext> catchEnv =
2281 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2282 try {
2283 Type ctype = attribStat(c.param, catchEnv);
2284 if (TreeInfo.isMultiCatch(c)) {
2285 //multi-catch parameter is implicitly marked as final
2286 c.param.sym.flags_field |= FINAL | UNION;
2287 }
2288 if (c.param.sym.kind == VAR) {
2289 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2290 }
2291 chk.checkType(c.param.vartype.pos(),
2292 chk.checkClassType(c.param.vartype.pos(), ctype),
2293 syms.throwableType);
2294 attribStat(c.body, catchEnv);
2295 } finally {
2296 catchEnv.info.scope.leave();
2297 }
2298 }
2299
2300 // Attribute finalizer
2301 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2302 result = null;
2303 }
2304 finally {
2305 localEnv.info.scope.leave();
2306 }
2307 }
2308
2309 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2310 if (!resource.isErroneous() &&
2311 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2312 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2313 Symbol close = syms.noSymbol;
2314 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2315 try {
2316 close = rs.resolveQualifiedMethod(pos,
2317 env,
2318 types.skipTypeVars(resource, false),
2319 names.close,
2320 List.nil(),
2321 List.nil());
2322 }
2323 finally {
2324 log.popDiagnosticHandler(discardHandler);
2325 }
2326 if (close.kind == MTH &&
2327 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2328 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2329 env.info.lint.logIfEnabled(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2330 }
2331 }
2332 }
2333
2334 public void visitConditional(JCConditional tree) {
2335 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2336 MatchBindings condBindings = matchBindings;
2337
2338 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2339 isBooleanOrNumeric(env, tree)) ?
2340 PolyKind.STANDALONE : PolyKind.POLY;
2341
2342 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2343 //this means we are returning a poly conditional from void-compatible lambda expression
2344 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2345 result = tree.type = types.createErrorType(resultInfo.pt);
2346 return;
2347 }
2348
2349 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2350 unknownExprInfo :
2351 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2352
2353
2354 // x ? y : z
2355 // include x's bindings when true in y
2356 // include x's bindings when false in z
2357
2358 Type truetype;
2359 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2360 try {
2361 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2362 } finally {
2363 trueEnv.info.scope.leave();
2364 }
2365
2366 MatchBindings trueBindings = matchBindings;
2367
2368 Type falsetype;
2369 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2370 try {
2371 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2372 } finally {
2373 falseEnv.info.scope.leave();
2374 }
2375
2376 MatchBindings falseBindings = matchBindings;
2377
2378 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2379 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2380 List.of(truetype, falsetype)) : pt();
2381 if (condtype.constValue() != null &&
2382 truetype.constValue() != null &&
2383 falsetype.constValue() != null &&
2384 !owntype.hasTag(NONE)) {
2385 //constant folding
2386 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2387 }
2388 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2389 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2390 }
2391 //where
2392 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2393 switch (tree.getTag()) {
2394 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2395 ((JCLiteral)tree).typetag == BOOLEAN ||
2396 ((JCLiteral)tree).typetag == BOT;
2397 case LAMBDA: case REFERENCE: return false;
2398 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2399 case CONDEXPR:
2400 JCConditional condTree = (JCConditional)tree;
2401 return isBooleanOrNumeric(env, condTree.truepart) &&
2402 isBooleanOrNumeric(env, condTree.falsepart);
2403 case APPLY:
2404 JCMethodInvocation speculativeMethodTree =
2405 (JCMethodInvocation)deferredAttr.attribSpeculative(
2406 tree, env, unknownExprInfo,
2407 argumentAttr.withLocalCacheContext());
2408 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2409 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2410 env.enclClass.type :
2411 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2412 Type owntype = types.memberType(receiverType, msym).getReturnType();
2413 return primitiveOrBoxed(owntype);
2414 case NEWCLASS:
2415 JCExpression className =
2416 removeClassParams.translate(((JCNewClass)tree).clazz);
2417 JCExpression speculativeNewClassTree =
2418 (JCExpression)deferredAttr.attribSpeculative(
2419 className, env, unknownTypeInfo,
2420 argumentAttr.withLocalCacheContext());
2421 return primitiveOrBoxed(speculativeNewClassTree.type);
2422 default:
2423 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2424 argumentAttr.withLocalCacheContext()).type;
2425 return primitiveOrBoxed(speculativeType);
2426 }
2427 }
2428 //where
2429 boolean primitiveOrBoxed(Type t) {
2430 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2431 }
2432
2433 TreeTranslator removeClassParams = new TreeTranslator() {
2434 @Override
2435 public void visitTypeApply(JCTypeApply tree) {
2436 result = translate(tree.clazz);
2437 }
2438 };
2439
2440 CheckContext conditionalContext(CheckContext checkContext) {
2441 return new Check.NestedCheckContext(checkContext) {
2442 //this will use enclosing check context to check compatibility of
2443 //subexpression against target type; if we are in a method check context,
2444 //depending on whether boxing is allowed, we could have incompatibilities
2445 @Override
2446 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2447 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2448 }
2449 };
2450 }
2451
2452 /** Compute the type of a conditional expression, after
2453 * checking that it exists. See JLS 15.25. Does not take into
2454 * account the special case where condition and both arms
2455 * are constants.
2456 *
2457 * @param pos The source position to be used for error
2458 * diagnostics.
2459 * @param thentype The type of the expression's then-part.
2460 * @param elsetype The type of the expression's else-part.
2461 */
2462 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2463 if (condTypes.isEmpty()) {
2464 return syms.objectType; //TODO: how to handle?
2465 }
2466 Type first = condTypes.head;
2467 // If same type, that is the result
2468 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2469 return first.baseType();
2470
2471 List<Type> unboxedTypes = condTypes.stream()
2472 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2473 .collect(List.collector());
2474
2475 // Otherwise, if both arms can be converted to a numeric
2476 // type, return the least numeric type that fits both arms
2477 // (i.e. return larger of the two, or return int if one
2478 // arm is short, the other is char).
2479 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2480 // If one arm has an integer subrange type (i.e., byte,
2481 // short, or char), and the other is an integer constant
2482 // that fits into the subrange, return the subrange type.
2483 for (Type type : unboxedTypes) {
2484 if (!type.getTag().isStrictSubRangeOf(INT)) {
2485 continue;
2486 }
2487 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2488 return type.baseType();
2489 }
2490
2491 for (TypeTag tag : primitiveTags) {
2492 Type candidate = syms.typeOfTag[tag.ordinal()];
2493 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2494 return candidate;
2495 }
2496 }
2497 }
2498
2499 // Those were all the cases that could result in a primitive
2500 condTypes = condTypes.stream()
2501 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2502 .collect(List.collector());
2503
2504 for (Type type : condTypes) {
2505 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2506 return type.baseType();
2507 }
2508
2509 Iterator<DiagnosticPosition> posIt = positions.iterator();
2510
2511 condTypes = condTypes.stream()
2512 .map(t -> chk.checkNonVoid(posIt.next(), t))
2513 .collect(List.collector());
2514
2515 // both are known to be reference types. The result is
2516 // lub(thentype,elsetype). This cannot fail, as it will
2517 // always be possible to infer "Object" if nothing better.
2518 return types.lub(condTypes.stream()
2519 .map(t -> t.baseType())
2520 .filter(t -> !t.hasTag(BOT))
2521 .collect(List.collector()));
2522 }
2523
2524 static final TypeTag[] primitiveTags = new TypeTag[]{
2525 BYTE,
2526 CHAR,
2527 SHORT,
2528 INT,
2529 LONG,
2530 FLOAT,
2531 DOUBLE,
2532 BOOLEAN,
2533 };
2534
2535 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2536 return bindingEnv(env, env.tree, bindings);
2537 }
2538
2539 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2540 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2541 bindings.forEach(env1.info.scope::enter);
2542 return env1;
2543 }
2544
2545 public void visitIf(JCIf tree) {
2546 attribExpr(tree.cond, env, syms.booleanType);
2547
2548 // if (x) { y } [ else z ]
2549 // include x's bindings when true in y
2550 // include x's bindings when false in z
2551
2552 MatchBindings condBindings = matchBindings;
2553 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2554
2555 try {
2556 attribStat(tree.thenpart, thenEnv);
2557 } finally {
2558 thenEnv.info.scope.leave();
2559 }
2560
2561 preFlow(tree.thenpart);
2562 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2563 boolean aliveAfterElse;
2564
2565 if (tree.elsepart != null) {
2566 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2567 try {
2568 attribStat(tree.elsepart, elseEnv);
2569 } finally {
2570 elseEnv.info.scope.leave();
2571 }
2572 preFlow(tree.elsepart);
2573 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2574 } else {
2575 aliveAfterElse = true;
2576 }
2577
2578 chk.checkEmptyIf(tree);
2579
2580 List<BindingSymbol> afterIfBindings = List.nil();
2581
2582 if (aliveAfterThen && !aliveAfterElse) {
2583 afterIfBindings = condBindings.bindingsWhenTrue;
2584 } else if (aliveAfterElse && !aliveAfterThen) {
2585 afterIfBindings = condBindings.bindingsWhenFalse;
2586 }
2587
2588 addBindings2Scope(tree, afterIfBindings);
2589
2590 result = null;
2591 }
2592
2593 void preFlow(JCTree tree) {
2594 attrRecover.doRecovery();
2595 new PostAttrAnalyzer() {
2596 @Override
2597 public void scan(JCTree tree) {
2598 if (tree == null ||
2599 (tree.type != null &&
2600 tree.type == Type.stuckType)) {
2601 //don't touch stuck expressions!
2602 return;
2603 }
2604 super.scan(tree);
2605 }
2606
2607 @Override
2608 public void visitClassDef(JCClassDecl that) {
2609 if (that.sym != null) {
2610 // Method preFlow shouldn't visit class definitions
2611 // that have not been entered and attributed.
2612 // See JDK-8254557 and JDK-8203277 for more details.
2613 super.visitClassDef(that);
2614 }
2615 }
2616
2617 @Override
2618 public void visitLambda(JCLambda that) {
2619 if (that.type != null) {
2620 // Method preFlow shouldn't visit lambda expressions
2621 // that have not been entered and attributed.
2622 // See JDK-8254557 and JDK-8203277 for more details.
2623 super.visitLambda(that);
2624 }
2625 }
2626 }.scan(tree);
2627 }
2628
2629 public void visitExec(JCExpressionStatement tree) {
2630 //a fresh environment is required for 292 inference to work properly ---
2631 //see Infer.instantiatePolymorphicSignatureInstance()
2632 Env<AttrContext> localEnv = env.dup(tree);
2633 attribExpr(tree.expr, localEnv);
2634 result = null;
2635 }
2636
2637 public void visitBreak(JCBreak tree) {
2638 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2639 result = null;
2640 }
2641
2642 public void visitYield(JCYield tree) {
2643 if (env.info.yieldResult != null) {
2644 attribTree(tree.value, env, env.info.yieldResult);
2645 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2646 } else {
2647 log.error(tree.pos(), tree.value.hasTag(PARENS)
2648 ? Errors.NoSwitchExpressionQualify
2649 : Errors.NoSwitchExpression);
2650 attribTree(tree.value, env, unknownExprInfo);
2651 }
2652 result = null;
2653 }
2654
2655 public void visitContinue(JCContinue tree) {
2656 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2657 result = null;
2658 }
2659 //where
2660 /** Return the target of a break, continue or yield statement,
2661 * if it exists, report an error if not.
2662 * Note: The target of a labelled break or continue is the
2663 * (non-labelled) statement tree referred to by the label,
2664 * not the tree representing the labelled statement itself.
2665 *
2666 * @param pos The position to be used for error diagnostics
2667 * @param tag The tag of the jump statement. This is either
2668 * Tree.BREAK or Tree.CONTINUE.
2669 * @param label The label of the jump statement, or null if no
2670 * label is given.
2671 * @param env The environment current at the jump statement.
2672 */
2673 private JCTree findJumpTarget(DiagnosticPosition pos,
2674 JCTree.Tag tag,
2675 Name label,
2676 Env<AttrContext> env) {
2677 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2678
2679 if (jumpTarget.snd != null) {
2680 log.error(pos, jumpTarget.snd);
2681 }
2682
2683 return jumpTarget.fst;
2684 }
2685 /** Return the target of a break or continue statement, if it exists,
2686 * report an error if not.
2687 * Note: The target of a labelled break or continue is the
2688 * (non-labelled) statement tree referred to by the label,
2689 * not the tree representing the labelled statement itself.
2690 *
2691 * @param tag The tag of the jump statement. This is either
2692 * Tree.BREAK or Tree.CONTINUE.
2693 * @param label The label of the jump statement, or null if no
2694 * label is given.
2695 * @param env The environment current at the jump statement.
2696 */
2697 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2698 Name label,
2699 Env<AttrContext> env) {
2700 // Search environments outwards from the point of jump.
2701 Env<AttrContext> env1 = env;
2702 JCDiagnostic.Error pendingError = null;
2703 LOOP:
2704 while (env1 != null) {
2705 switch (env1.tree.getTag()) {
2706 case LABELLED:
2707 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2708 if (label == labelled.label) {
2709 // If jump is a continue, check that target is a loop.
2710 if (tag == CONTINUE) {
2711 if (!labelled.body.hasTag(DOLOOP) &&
2712 !labelled.body.hasTag(WHILELOOP) &&
2713 !labelled.body.hasTag(FORLOOP) &&
2714 !labelled.body.hasTag(FOREACHLOOP)) {
2715 pendingError = Errors.NotLoopLabel(label);
2716 }
2717 // Found labelled statement target, now go inwards
2718 // to next non-labelled tree.
2719 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2720 } else {
2721 return Pair.of(labelled, pendingError);
2722 }
2723 }
2724 break;
2725 case DOLOOP:
2726 case WHILELOOP:
2727 case FORLOOP:
2728 case FOREACHLOOP:
2729 if (label == null) return Pair.of(env1.tree, pendingError);
2730 break;
2731 case SWITCH:
2732 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2733 break;
2734 case SWITCH_EXPRESSION:
2735 if (tag == YIELD) {
2736 return Pair.of(env1.tree, null);
2737 } else if (tag == BREAK) {
2738 pendingError = Errors.BreakOutsideSwitchExpression;
2739 } else {
2740 pendingError = Errors.ContinueOutsideSwitchExpression;
2741 }
2742 break;
2743 case LAMBDA:
2744 case METHODDEF:
2745 case CLASSDEF:
2746 break LOOP;
2747 default:
2748 }
2749 env1 = env1.next;
2750 }
2751 if (label != null)
2752 return Pair.of(null, Errors.UndefLabel(label));
2753 else if (pendingError != null)
2754 return Pair.of(null, pendingError);
2755 else if (tag == CONTINUE)
2756 return Pair.of(null, Errors.ContOutsideLoop);
2757 else
2758 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2759 }
2760
2761 public void visitReturn(JCReturn tree) {
2762 // Check that there is an enclosing method which is
2763 // nested within than the enclosing class.
2764 if (env.info.returnResult == null) {
2765 log.error(tree.pos(), Errors.RetOutsideMeth);
2766 } else if (env.info.yieldResult != null) {
2767 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2768 if (tree.expr != null) {
2769 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2770 }
2771 } else if (!env.info.isLambda &&
2772 env.enclMethod != null &&
2773 TreeInfo.isCompactConstructor(env.enclMethod)) {
2774 log.error(env.enclMethod,
2775 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2776 } else {
2777 // Attribute return expression, if it exists, and check that
2778 // it conforms to result type of enclosing method.
2779 if (tree.expr != null) {
2780 if (env.info.returnResult.pt.hasTag(VOID)) {
2781 env.info.returnResult.checkContext.report(tree.expr.pos(),
2782 diags.fragment(Fragments.UnexpectedRetVal));
2783 }
2784 attribTree(tree.expr, env, env.info.returnResult);
2785 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2786 !env.info.returnResult.pt.hasTag(NONE)) {
2787 env.info.returnResult.checkContext.report(tree.pos(),
2788 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2789 }
2790 }
2791 result = null;
2792 }
2793
2794 public void visitThrow(JCThrow tree) {
2795 Type owntype = attribExpr(tree.expr, env, Type.noType);
2796 chk.checkType(tree, owntype, syms.throwableType);
2797 result = null;
2798 }
2799
2800 public void visitAssert(JCAssert tree) {
2801 attribExpr(tree.cond, env, syms.booleanType);
2802 if (tree.detail != null) {
2803 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2804 }
2805 result = null;
2806 }
2807
2808 /** Visitor method for method invocations.
2809 * NOTE: The method part of an application will have in its type field
2810 * the return type of the method, not the method's type itself!
2811 */
2812 public void visitApply(JCMethodInvocation tree) {
2813 // The local environment of a method application is
2814 // a new environment nested in the current one.
2815 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2816
2817 // The types of the actual method arguments.
2818 List<Type> argtypes;
2819
2820 // The types of the actual method type arguments.
2821 List<Type> typeargtypes = null;
2822
2823 Name methName = TreeInfo.name(tree.meth);
2824
2825 boolean isConstructorCall =
2826 methName == names._this || methName == names._super;
2827
2828 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2829 if (isConstructorCall) {
2830
2831 // Attribute arguments, yielding list of argument types.
2832 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2833 argtypes = argtypesBuf.toList();
2834 typeargtypes = attribTypes(tree.typeargs, localEnv);
2835
2836 // Done with this()/super() parameters. End of constructor prologue.
2837 env.info.ctorPrologue = false;
2838
2839 // Variable `site' points to the class in which the called
2840 // constructor is defined.
2841 Type site = env.enclClass.sym.type;
2842 if (methName == names._super) {
2843 if (site == syms.objectType) {
2844 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2845 site = types.createErrorType(syms.objectType);
2846 } else {
2847 site = types.supertype(site);
2848 }
2849 }
2850
2851 if (site.hasTag(CLASS)) {
2852 Type encl = site.getEnclosingType();
2853 while (encl != null && encl.hasTag(TYPEVAR))
2854 encl = encl.getUpperBound();
2855 if (encl.hasTag(CLASS)) {
2856 // we are calling a nested class
2857
2858 if (tree.meth.hasTag(SELECT)) {
2859 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2860
2861 // We are seeing a prefixed call, of the form
2862 // <expr>.super(...).
2863 // Check that the prefix expression conforms
2864 // to the outer instance type of the class.
2865 chk.checkRefType(qualifier.pos(),
2866 attribExpr(qualifier, localEnv,
2867 encl));
2868 }
2869 } else if (tree.meth.hasTag(SELECT)) {
2870 log.error(tree.meth.pos(),
2871 Errors.IllegalQualNotIcls(site.tsym));
2872 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2873 }
2874
2875 if (tree.meth.hasTag(IDENT)) {
2876 // non-qualified super(...) call; check whether explicit constructor
2877 // invocation is well-formed. If the super class is an inner class,
2878 // make sure that an appropriate implicit qualifier exists. If the super
2879 // class is a local class, make sure that the current class is defined
2880 // in the same context as the local class.
2881 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2882 }
2883
2884 // if we're calling a java.lang.Enum constructor,
2885 // prefix the implicit String and int parameters
2886 if (site.tsym == syms.enumSym)
2887 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2888
2889 // Resolve the called constructor under the assumption
2890 // that we are referring to a superclass instance of the
2891 // current instance (JLS ???).
2892 boolean selectSuperPrev = localEnv.info.selectSuper;
2893 localEnv.info.selectSuper = true;
2894 localEnv.info.pendingResolutionPhase = null;
2895 Symbol sym = rs.resolveConstructor(
2896 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2897 localEnv.info.selectSuper = selectSuperPrev;
2898
2899 // Set method symbol to resolved constructor...
2900 TreeInfo.setSymbol(tree.meth, sym);
2901
2902 // ...and check that it is legal in the current context.
2903 // (this will also set the tree's type)
2904 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2905 checkId(tree.meth, site, sym, localEnv,
2906 new ResultInfo(kind, mpt));
2907 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2908 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2909 }
2910 // Otherwise, `site' is an error type and we do nothing
2911 result = tree.type = syms.voidType;
2912 } else {
2913 // Otherwise, we are seeing a regular method call.
2914 // Attribute the arguments, yielding list of argument types, ...
2915 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2916 argtypes = argtypesBuf.toList();
2917 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2918
2919 // ... and attribute the method using as a prototype a methodtype
2920 // whose formal argument types is exactly the list of actual
2921 // arguments (this will also set the method symbol).
2922 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2923 localEnv.info.pendingResolutionPhase = null;
2924 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2925
2926 // Compute the result type.
2927 Type restype = mtype.getReturnType();
2928 if (restype.hasTag(WILDCARD))
2929 throw new AssertionError(mtype);
2930
2931 Type qualifier = (tree.meth.hasTag(SELECT))
2932 ? ((JCFieldAccess) tree.meth).selected.type
2933 : env.enclClass.sym.type;
2934 Symbol msym = TreeInfo.symbol(tree.meth);
2935 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2936
2937 chk.checkRefTypes(tree.typeargs, typeargtypes);
2938
2939 // Check that value of resulting type is admissible in the
2940 // current context. Also, capture the return type
2941 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2942 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2943 }
2944 chk.checkRequiresIdentity(tree, env.info.lint);
2945 chk.validate(tree.typeargs, localEnv);
2946 }
2947 //where
2948 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2949 if (msym != null &&
2950 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2951 methodName == names.getClass &&
2952 argtypes.isEmpty()) {
2953 // as a special case, x.getClass() has type Class<? extends |X|>
2954 return new ClassType(restype.getEnclosingType(),
2955 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2956 BoundKind.EXTENDS,
2957 syms.boundClass)),
2958 restype.tsym,
2959 restype.getMetadata());
2960 } else if (msym != null &&
2961 msym.owner == syms.arrayClass &&
2962 methodName == names.clone &&
2963 types.isArray(qualifierType)) {
2964 // as a special case, array.clone() has a result that is
2965 // the same as static type of the array being cloned
2966 return qualifierType;
2967 } else {
2968 return restype;
2969 }
2970 }
2971
2972 /** Obtain a method type with given argument types.
2973 */
2974 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2975 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2976 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2977 }
2978
2979 public void visitNewClass(final JCNewClass tree) {
2980 Type owntype = types.createErrorType(tree.type);
2981
2982 // The local environment of a class creation is
2983 // a new environment nested in the current one.
2984 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2985
2986 // The anonymous inner class definition of the new expression,
2987 // if one is defined by it.
2988 JCClassDecl cdef = tree.def;
2989
2990 // If enclosing class is given, attribute it, and
2991 // complete class name to be fully qualified
2992 JCExpression clazz = tree.clazz; // Class field following new
2993 JCExpression clazzid; // Identifier in class field
2994 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2995 annoclazzid = null;
2996
2997 if (clazz.hasTag(TYPEAPPLY)) {
2998 clazzid = ((JCTypeApply) clazz).clazz;
2999 if (clazzid.hasTag(ANNOTATED_TYPE)) {
3000 annoclazzid = (JCAnnotatedType) clazzid;
3001 clazzid = annoclazzid.underlyingType;
3002 }
3003 } else {
3004 if (clazz.hasTag(ANNOTATED_TYPE)) {
3005 annoclazzid = (JCAnnotatedType) clazz;
3006 clazzid = annoclazzid.underlyingType;
3007 } else {
3008 clazzid = clazz;
3009 }
3010 }
3011
3012 JCExpression clazzid1 = clazzid; // The same in fully qualified form
3013
3014 if (tree.encl != null) {
3015 // We are seeing a qualified new, of the form
3016 // <expr>.new C <...> (...) ...
3017 // In this case, we let clazz stand for the name of the
3018 // allocated class C prefixed with the type of the qualifier
3019 // expression, so that we can
3020 // resolve it with standard techniques later. I.e., if
3021 // <expr> has type T, then <expr>.new C <...> (...)
3022 // yields a clazz T.C.
3023 Type encltype = chk.checkRefType(tree.encl.pos(),
3024 attribExpr(tree.encl, env));
3025 // TODO 308: in <expr>.new C, do we also want to add the type annotations
3026 // from expr to the combined type, or not? Yes, do this.
3027 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
3028 ((JCIdent) clazzid).name);
3029
3030 EndPosTable endPosTable = this.env.toplevel.endPositions;
3031 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
3032 if (clazz.hasTag(ANNOTATED_TYPE)) {
3033 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
3034 List<JCAnnotation> annos = annoType.annotations;
3035
3036 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
3037 clazzid1 = make.at(tree.pos).
3038 TypeApply(clazzid1,
3039 ((JCTypeApply) clazz).arguments);
3040 }
3041
3042 clazzid1 = make.at(tree.pos).
3043 AnnotatedType(annos, clazzid1);
3044 } else if (clazz.hasTag(TYPEAPPLY)) {
3045 clazzid1 = make.at(tree.pos).
3046 TypeApply(clazzid1,
3047 ((JCTypeApply) clazz).arguments);
3048 }
3049
3050 clazz = clazzid1;
3051 }
3052
3053 // Attribute clazz expression and store
3054 // symbol + type back into the attributed tree.
3055 Type clazztype;
3056
3057 try {
3058 env.info.isAnonymousNewClass = tree.def != null;
3059 clazztype = TreeInfo.isEnumInit(env.tree) ?
3060 attribIdentAsEnumType(env, (JCIdent)clazz) :
3061 attribType(clazz, env);
3062 } finally {
3063 env.info.isAnonymousNewClass = false;
3064 }
3065
3066 clazztype = chk.checkDiamond(tree, clazztype);
3067 chk.validate(clazz, localEnv);
3068 if (tree.encl != null) {
3069 // We have to work in this case to store
3070 // symbol + type back into the attributed tree.
3071 tree.clazz.type = clazztype;
3072 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
3073 clazzid.type = ((JCIdent) clazzid).sym.type;
3074 if (annoclazzid != null) {
3075 annoclazzid.type = clazzid.type;
3076 }
3077 if (!clazztype.isErroneous()) {
3078 if (cdef != null && clazztype.tsym.isInterface()) {
3079 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
3080 } else if (clazztype.tsym.isStatic()) {
3081 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
3082 }
3083 }
3084 } else {
3085 // Check for the existence of an apropos outer instance
3086 checkNewInnerClass(tree.pos(), env, clazztype, false);
3087 }
3088
3089 // Attribute constructor arguments.
3090 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
3091 final KindSelector pkind =
3092 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
3093 List<Type> argtypes = argtypesBuf.toList();
3094 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
3095
3096 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
3097 // Enums may not be instantiated except implicitly
3098 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
3099 (!env.tree.hasTag(VARDEF) ||
3100 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
3101 ((JCVariableDecl) env.tree).init != tree))
3102 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
3103
3104 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
3105 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3106 boolean skipNonDiamondPath = false;
3107 // Check that class is not abstract
3108 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
3109 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
3110 log.error(tree.pos(),
3111 Errors.AbstractCantBeInstantiated(clazztype.tsym));
3112 skipNonDiamondPath = true;
3113 } else if (cdef != null && clazztype.tsym.isInterface()) {
3114 // Check that no constructor arguments are given to
3115 // anonymous classes implementing an interface
3116 if (!argtypes.isEmpty())
3117 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
3118
3119 if (!typeargtypes.isEmpty())
3120 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
3121
3122 // Error recovery: pretend no arguments were supplied.
3123 argtypes = List.nil();
3124 typeargtypes = List.nil();
3125 skipNonDiamondPath = true;
3126 }
3127 if (TreeInfo.isDiamond(tree)) {
3128 ClassType site = new ClassType(clazztype.getEnclosingType(),
3129 clazztype.tsym.type.getTypeArguments(),
3130 clazztype.tsym,
3131 clazztype.getMetadata());
3132
3133 Env<AttrContext> diamondEnv = localEnv.dup(tree);
3134 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
3135 diamondEnv.info.pendingResolutionPhase = null;
3136
3137 //if the type of the instance creation expression is a class type
3138 //apply method resolution inference (JLS 15.12.2.7). The return type
3139 //of the resolved constructor will be a partially instantiated type
3140 Symbol constructor = rs.resolveDiamond(tree.pos(),
3141 diamondEnv,
3142 site,
3143 argtypes,
3144 typeargtypes);
3145 tree.constructor = constructor.baseSymbol();
3146
3147 final TypeSymbol csym = clazztype.tsym;
3148 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
3149 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3150 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
3151 constructorType = checkId(tree, site,
3152 constructor,
3153 diamondEnv,
3154 diamondResult);
3155
3156 tree.clazz.type = types.createErrorType(clazztype);
3157 if (!constructorType.isErroneous()) {
3158 tree.clazz.type = clazz.type = constructorType.getReturnType();
3159 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
3160 }
3161 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
3162 }
3163
3164 // Resolve the called constructor under the assumption
3165 // that we are referring to a superclass instance of the
3166 // current instance (JLS ???).
3167 else if (!skipNonDiamondPath) {
3168 //the following code alters some of the fields in the current
3169 //AttrContext - hence, the current context must be dup'ed in
3170 //order to avoid downstream failures
3171 Env<AttrContext> rsEnv = localEnv.dup(tree);
3172 rsEnv.info.selectSuper = cdef != null;
3173 rsEnv.info.pendingResolutionPhase = null;
3174 tree.constructor = rs.resolveConstructor(
3175 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
3176 if (cdef == null) { //do not check twice!
3177 tree.constructorType = checkId(tree,
3178 clazztype,
3179 tree.constructor,
3180 rsEnv,
3181 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3182 if (rsEnv.info.lastResolveVarargs())
3183 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
3184 }
3185 }
3186
3187 chk.checkRequiresIdentity(tree, env.info.lint);
3188
3189 if (cdef != null) {
3190 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
3191 return;
3192 }
3193
3194 if (tree.constructor != null && tree.constructor.kind == MTH)
3195 owntype = clazztype;
3196 }
3197 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3198 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3199 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
3200 //we need to wait for inference to finish and then replace inference vars in the constructor type
3201 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
3202 instantiatedContext -> {
3203 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3204 });
3205 }
3206 chk.validate(tree.typeargs, localEnv);
3207 }
3208
3209 // where
3210 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
3211 JCClassDecl cdef, Env<AttrContext> localEnv,
3212 List<Type> argtypes, List<Type> typeargtypes,
3213 KindSelector pkind) {
3214 // We are seeing an anonymous class instance creation.
3215 // In this case, the class instance creation
3216 // expression
3217 //
3218 // E.new <typeargs1>C<typargs2>(args) { ... }
3219 //
3220 // is represented internally as
3221 //
3222 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
3223 //
3224 // This expression is then *transformed* as follows:
3225 //
3226 // (1) add an extends or implements clause
3227 // (2) add a constructor.
3228 //
3229 // For instance, if C is a class, and ET is the type of E,
3230 // the expression
3231 //
3232 // E.new <typeargs1>C<typargs2>(args) { ... }
3233 //
3234 // is translated to (where X is a fresh name and typarams is the
3235 // parameter list of the super constructor):
3236 //
3237 // new <typeargs1>X(<*nullchk*>E, args) where
3238 // X extends C<typargs2> {
3239 // <typarams> X(ET e, args) {
3240 // e.<typeargs1>super(args)
3241 // }
3242 // ...
3243 // }
3244 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3245 Type enclType = clazztype.getEnclosingType();
3246 if (enclType != null &&
3247 enclType.hasTag(CLASS) &&
3248 !chk.checkDenotable((ClassType)enclType)) {
3249 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
3250 }
3251 final boolean isDiamond = TreeInfo.isDiamond(tree);
3252 if (isDiamond
3253 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3254 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3255 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3256 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3257 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3258 instantiatedContext -> {
3259 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3260 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3261 ResultInfo prevResult = this.resultInfo;
3262 try {
3263 this.resultInfo = resultInfoForClassDefinition;
3264 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3265 dupLocalEnv, argtypes, typeargtypes, pkind);
3266 } finally {
3267 this.resultInfo = prevResult;
3268 }
3269 });
3270 } else {
3271 if (isDiamond && clazztype.hasTag(CLASS)) {
3272 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3273 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3274 // One or more types inferred in the previous steps is non-denotable.
3275 Fragment fragment = Diamond(clazztype.tsym);
3276 log.error(tree.clazz.pos(),
3277 Errors.CantApplyDiamond1(
3278 fragment,
3279 invalidDiamondArgs.size() > 1 ?
3280 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3281 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3282 }
3283 // For <>(){}, inferred types must also be accessible.
3284 for (Type t : clazztype.getTypeArguments()) {
3285 rs.checkAccessibleType(env, t);
3286 }
3287 }
3288
3289 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3290 // false for isInterface call even when the original type is an interface.
3291 boolean implementing = clazztype.tsym.isInterface() ||
3292 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3293 clazztype.getOriginalType().tsym.isInterface();
3294
3295 if (implementing) {
3296 cdef.implementing = List.of(clazz);
3297 } else {
3298 cdef.extending = clazz;
3299 }
3300
3301 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3302 rs.isSerializable(clazztype)) {
3303 localEnv.info.isSerializable = true;
3304 }
3305
3306 attribStat(cdef, localEnv);
3307
3308 List<Type> finalargtypes;
3309 // If an outer instance is given,
3310 // prefix it to the constructor arguments
3311 // and delete it from the new expression
3312 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3313 finalargtypes = argtypes.prepend(tree.encl.type);
3314 } else {
3315 finalargtypes = argtypes;
3316 }
3317
3318 // Reassign clazztype and recompute constructor. As this necessarily involves
3319 // another attribution pass for deferred types in the case of <>, replicate
3320 // them. Original arguments have right decorations already.
3321 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3322 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3323 }
3324
3325 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3326 : cdef.sym.type;
3327 Symbol sym = tree.constructor = rs.resolveConstructor(
3328 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3329 Assert.check(!sym.kind.isResolutionError());
3330 tree.constructor = sym;
3331 tree.constructorType = checkId(tree,
3332 clazztype,
3333 tree.constructor,
3334 localEnv,
3335 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3336 }
3337 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3338 clazztype : types.createErrorType(tree.type);
3339 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3340 chk.validate(tree.typeargs, localEnv);
3341 }
3342
3343 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3344 return new Check.NestedCheckContext(checkContext) {
3345 @Override
3346 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3347 enclosingContext.report(clazz.clazz,
3348 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3349 }
3350 };
3351 }
3352
3353 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3354 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3355 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3356 (!isLocal && !type.tsym.isInner()) ||
3357 (isSuper && env.enclClass.sym.isAnonymous())) {
3358 // nothing to check
3359 return;
3360 }
3361 Symbol res = isLocal ?
3362 rs.findLocalClassOwner(env, type.tsym) :
3363 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3364 if (res.exists()) {
3365 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3366 } else {
3367 log.error(pos, Errors.EnclClassRequired(type.tsym));
3368 }
3369 }
3370
3371 /** Make an attributed null check tree.
3372 */
3373 public JCExpression makeNullCheck(JCExpression arg) {
3374 // optimization: new Outer() can never be null; skip null check
3375 if (arg.getTag() == NEWCLASS)
3376 return arg;
3377 // optimization: X.this is never null; skip null check
3378 Name name = TreeInfo.name(arg);
3379 if (name == names._this || name == names._super) return arg;
3380
3381 JCTree.Tag optag = NULLCHK;
3382 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3383 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3384 tree.type = arg.type;
3385 return tree;
3386 }
3387
3388 public void visitNewArray(JCNewArray tree) {
3389 Type owntype = types.createErrorType(tree.type);
3390 Env<AttrContext> localEnv = env.dup(tree);
3391 Type elemtype;
3392 if (tree.elemtype != null) {
3393 elemtype = attribType(tree.elemtype, localEnv);
3394 chk.validate(tree.elemtype, localEnv);
3395 owntype = elemtype;
3396 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3397 attribExpr(l.head, localEnv, syms.intType);
3398 owntype = new ArrayType(owntype, syms.arrayClass);
3399 }
3400 } else {
3401 // we are seeing an untyped aggregate { ... }
3402 // this is allowed only if the prototype is an array
3403 if (pt().hasTag(ARRAY)) {
3404 elemtype = types.elemtype(pt());
3405 } else {
3406 if (!pt().hasTag(ERROR) &&
3407 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3408 log.error(tree.pos(),
3409 Errors.IllegalInitializerForType(pt()));
3410 }
3411 elemtype = types.createErrorType(pt());
3412 }
3413 }
3414 if (tree.elems != null) {
3415 attribExprs(tree.elems, localEnv, elemtype);
3416 owntype = new ArrayType(elemtype, syms.arrayClass);
3417 }
3418 if (!types.isReifiable(elemtype))
3419 log.error(tree.pos(), Errors.GenericArrayCreation);
3420 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3421 }
3422
3423 /*
3424 * A lambda expression can only be attributed when a target-type is available.
3425 * In addition, if the target-type is that of a functional interface whose
3426 * descriptor contains inference variables in argument position the lambda expression
3427 * is 'stuck' (see DeferredAttr).
3428 */
3429 @Override
3430 public void visitLambda(final JCLambda that) {
3431 boolean wrongContext = false;
3432 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3433 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3434 //lambda only allowed in assignment or method invocation/cast context
3435 log.error(that.pos(), Errors.UnexpectedLambda);
3436 }
3437 resultInfo = recoveryInfo;
3438 wrongContext = true;
3439 }
3440 //create an environment for attribution of the lambda expression
3441 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3442 boolean needsRecovery =
3443 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3444 try {
3445 if (needsRecovery && rs.isSerializable(pt())) {
3446 localEnv.info.isSerializable = true;
3447 localEnv.info.isSerializableLambda = true;
3448 }
3449 List<Type> explicitParamTypes = null;
3450 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3451 //attribute lambda parameters
3452 attribStats(that.params, localEnv);
3453 explicitParamTypes = TreeInfo.types(that.params);
3454 }
3455
3456 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3457 Type currentTarget = targetInfo.target;
3458 Type lambdaType = targetInfo.descriptor;
3459
3460 if (currentTarget.isErroneous()) {
3461 result = that.type = currentTarget;
3462 return;
3463 }
3464
3465 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3466
3467 if (lambdaType.hasTag(FORALL)) {
3468 //lambda expression target desc cannot be a generic method
3469 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3470 kindName(currentTarget.tsym),
3471 currentTarget.tsym);
3472 resultInfo.checkContext.report(that, diags.fragment(msg));
3473 result = that.type = types.createErrorType(pt());
3474 return;
3475 }
3476
3477 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3478 //add param type info in the AST
3479 List<Type> actuals = lambdaType.getParameterTypes();
3480 List<JCVariableDecl> params = that.params;
3481
3482 boolean arityMismatch = false;
3483
3484 while (params.nonEmpty()) {
3485 if (actuals.isEmpty()) {
3486 //not enough actuals to perform lambda parameter inference
3487 arityMismatch = true;
3488 }
3489 //reset previously set info
3490 Type argType = arityMismatch ?
3491 syms.errType :
3492 actuals.head;
3493 if (params.head.isImplicitlyTyped()) {
3494 setSyntheticVariableType(params.head, argType);
3495 }
3496 params.head.sym = null;
3497 actuals = actuals.isEmpty() ?
3498 actuals :
3499 actuals.tail;
3500 params = params.tail;
3501 }
3502
3503 //attribute lambda parameters
3504 attribStats(that.params, localEnv);
3505
3506 if (arityMismatch) {
3507 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3508 result = that.type = types.createErrorType(currentTarget);
3509 return;
3510 }
3511 }
3512
3513 //from this point on, no recovery is needed; if we are in assignment context
3514 //we will be able to attribute the whole lambda body, regardless of errors;
3515 //if we are in a 'check' method context, and the lambda is not compatible
3516 //with the target-type, it will be recovered anyway in Attr.checkId
3517 needsRecovery = false;
3518
3519 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3520 lambdaBodyResult(that, lambdaType, resultInfo);
3521
3522 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3523 attribTree(that.getBody(), localEnv, bodyResultInfo);
3524 } else {
3525 JCBlock body = (JCBlock)that.body;
3526 if (body == breakTree &&
3527 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3528 breakTreeFound(copyEnv(localEnv));
3529 }
3530 attribStats(body.stats, localEnv);
3531 }
3532
3533 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3534
3535 boolean isSpeculativeRound =
3536 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3537
3538 preFlow(that);
3539 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3540
3541 that.type = currentTarget; //avoids recovery at this stage
3542 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3543
3544 if (!isSpeculativeRound) {
3545 //add thrown types as bounds to the thrown types free variables if needed:
3546 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3547 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3548 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3549 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3550 }
3551 }
3552
3553 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3554 }
3555 result = wrongContext ? that.type = types.createErrorType(pt())
3556 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3557 } catch (Types.FunctionDescriptorLookupError ex) {
3558 JCDiagnostic cause = ex.getDiagnostic();
3559 resultInfo.checkContext.report(that, cause);
3560 result = that.type = types.createErrorType(pt());
3561 return;
3562 } catch (CompletionFailure cf) {
3563 chk.completionError(that.pos(), cf);
3564 } catch (Throwable t) {
3565 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3566 //as that would likely cause the same exception again.
3567 needsRecovery = false;
3568 throw t;
3569 } finally {
3570 localEnv.info.scope.leave();
3571 if (needsRecovery) {
3572 Type prevResult = result;
3573 try {
3574 attribTree(that, env, recoveryInfo);
3575 } finally {
3576 if (result == Type.recoveryType) {
3577 result = prevResult;
3578 }
3579 }
3580 }
3581 }
3582 }
3583 //where
3584 class TargetInfo {
3585 Type target;
3586 Type descriptor;
3587
3588 public TargetInfo(Type target, Type descriptor) {
3589 this.target = target;
3590 this.descriptor = descriptor;
3591 }
3592 }
3593
3594 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3595 Type lambdaType;
3596 Type currentTarget = resultInfo.pt;
3597 if (resultInfo.pt != Type.recoveryType) {
3598 /* We need to adjust the target. If the target is an
3599 * intersection type, for example: SAM & I1 & I2 ...
3600 * the target will be updated to SAM
3601 */
3602 currentTarget = targetChecker.visit(currentTarget, that);
3603 if (!currentTarget.isIntersection()) {
3604 if (explicitParamTypes != null) {
3605 currentTarget = infer.instantiateFunctionalInterface(that,
3606 currentTarget, explicitParamTypes, resultInfo.checkContext);
3607 }
3608 currentTarget = types.removeWildcards(currentTarget);
3609 lambdaType = types.findDescriptorType(currentTarget);
3610 } else {
3611 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3612 ListBuffer<Type> components = new ListBuffer<>();
3613 for (Type bound : ict.getExplicitComponents()) {
3614 if (explicitParamTypes != null) {
3615 try {
3616 bound = infer.instantiateFunctionalInterface(that,
3617 bound, explicitParamTypes, resultInfo.checkContext);
3618 } catch (FunctionDescriptorLookupError t) {
3619 // do nothing
3620 }
3621 }
3622 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3623 // bound must be j.l.Object or an interface, but not an annotation
3624 reportIntersectionError(that, "not.an.intf.component", bound);
3625 }
3626 bound = types.removeWildcards(bound);
3627 components.add(bound);
3628 }
3629 currentTarget = types.makeIntersectionType(components.toList());
3630 currentTarget.tsym.flags_field |= INTERFACE;
3631 lambdaType = types.findDescriptorType(currentTarget);
3632 }
3633
3634 } else {
3635 currentTarget = Type.recoveryType;
3636 lambdaType = fallbackDescriptorType(that);
3637 }
3638 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3639 //lambda expression target desc cannot be a generic method
3640 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3641 kindName(currentTarget.tsym),
3642 currentTarget.tsym);
3643 resultInfo.checkContext.report(that, diags.fragment(msg));
3644 currentTarget = types.createErrorType(pt());
3645 }
3646 return new TargetInfo(currentTarget, lambdaType);
3647 }
3648
3649 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3650 resultInfo.checkContext.report(pos,
3651 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3652 }
3653
3654 void preFlow(JCLambda tree) {
3655 attrRecover.doRecovery();
3656 new PostAttrAnalyzer() {
3657 @Override
3658 public void scan(JCTree tree) {
3659 if (tree == null ||
3660 (tree.type != null &&
3661 tree.type == Type.stuckType)) {
3662 //don't touch stuck expressions!
3663 return;
3664 }
3665 super.scan(tree);
3666 }
3667
3668 @Override
3669 public void visitClassDef(JCClassDecl that) {
3670 // or class declaration trees!
3671 }
3672
3673 public void visitLambda(JCLambda that) {
3674 // or lambda expressions!
3675 }
3676 }.scan(tree.body);
3677 }
3678
3679 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3680
3681 @Override
3682 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3683 return t.isIntersection() ?
3684 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3685 }
3686
3687 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3688 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3689 return ict;
3690 }
3691
3692 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3693 ListBuffer<Type> targs = new ListBuffer<>();
3694 ListBuffer<Type> supertypes = new ListBuffer<>();
3695 for (Type i : ict.interfaces_field) {
3696 if (i.isParameterized()) {
3697 targs.appendList(i.tsym.type.allparams());
3698 }
3699 supertypes.append(i.tsym.type);
3700 }
3701 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3702 notionalIntf.allparams_field = targs.toList();
3703 notionalIntf.tsym.flags_field |= INTERFACE;
3704 return notionalIntf.tsym;
3705 }
3706 };
3707
3708 private Type fallbackDescriptorType(JCExpression tree) {
3709 switch (tree.getTag()) {
3710 case LAMBDA:
3711 JCLambda lambda = (JCLambda)tree;
3712 List<Type> argtypes = List.nil();
3713 for (JCVariableDecl param : lambda.params) {
3714 argtypes = param.vartype != null && param.vartype.type != null ?
3715 argtypes.append(param.vartype.type) :
3716 argtypes.append(syms.errType);
3717 }
3718 return new MethodType(argtypes, Type.recoveryType,
3719 List.of(syms.throwableType), syms.methodClass);
3720 case REFERENCE:
3721 return new MethodType(List.nil(), Type.recoveryType,
3722 List.of(syms.throwableType), syms.methodClass);
3723 default:
3724 Assert.error("Cannot get here!");
3725 }
3726 return null;
3727 }
3728
3729 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3730 final InferenceContext inferenceContext, final Type... ts) {
3731 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3732 }
3733
3734 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3735 final InferenceContext inferenceContext, final List<Type> ts) {
3736 if (inferenceContext.free(ts)) {
3737 inferenceContext.addFreeTypeListener(ts,
3738 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3739 } else {
3740 for (Type t : ts) {
3741 rs.checkAccessibleType(env, t);
3742 }
3743 }
3744 }
3745
3746 /**
3747 * Lambda/method reference have a special check context that ensures
3748 * that i.e. a lambda return type is compatible with the expected
3749 * type according to both the inherited context and the assignment
3750 * context.
3751 */
3752 class FunctionalReturnContext extends Check.NestedCheckContext {
3753
3754 FunctionalReturnContext(CheckContext enclosingContext) {
3755 super(enclosingContext);
3756 }
3757
3758 @Override
3759 public boolean compatible(Type found, Type req, Warner warn) {
3760 //return type must be compatible in both current context and assignment context
3761 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3762 }
3763
3764 @Override
3765 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3766 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3767 }
3768 }
3769
3770 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3771
3772 JCExpression expr;
3773 boolean expStmtExpected;
3774
3775 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3776 super(enclosingContext);
3777 this.expr = expr;
3778 }
3779
3780 @Override
3781 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3782 if (expStmtExpected) {
3783 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3784 } else {
3785 super.report(pos, details);
3786 }
3787 }
3788
3789 @Override
3790 public boolean compatible(Type found, Type req, Warner warn) {
3791 //a void return is compatible with an expression statement lambda
3792 if (req.hasTag(VOID)) {
3793 expStmtExpected = true;
3794 return TreeInfo.isExpressionStatement(expr);
3795 } else {
3796 return super.compatible(found, req, warn);
3797 }
3798 }
3799 }
3800
3801 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3802 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3803 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3804 new FunctionalReturnContext(resultInfo.checkContext);
3805
3806 return descriptor.getReturnType() == Type.recoveryType ?
3807 recoveryInfo :
3808 new ResultInfo(KindSelector.VAL,
3809 descriptor.getReturnType(), funcContext);
3810 }
3811
3812 /**
3813 * Lambda compatibility. Check that given return types, thrown types, parameter types
3814 * are compatible with the expected functional interface descriptor. This means that:
3815 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3816 * types must be compatible with the return type of the expected descriptor.
3817 */
3818 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3819 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3820
3821 //return values have already been checked - but if lambda has no return
3822 //values, we must ensure that void/value compatibility is correct;
3823 //this amounts at checking that, if a lambda body can complete normally,
3824 //the descriptor's return type must be void
3825 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3826 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3827 Fragment msg =
3828 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3829 checkContext.report(tree,
3830 diags.fragment(msg));
3831 }
3832
3833 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3834 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3835 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3836 }
3837 }
3838
3839 /* This method returns an environment to be used to attribute a lambda
3840 * expression.
3841 *
3842 * The owner of this environment is a method symbol. If the current owner
3843 * is not a method (e.g. if the lambda occurs in a field initializer), then
3844 * a synthetic method symbol owner is created.
3845 */
3846 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3847 Env<AttrContext> lambdaEnv;
3848 Symbol owner = env.info.scope.owner;
3849 if (owner.kind == VAR && owner.owner.kind == TYP) {
3850 // If the lambda is nested in a field initializer, we need to create a fake init method.
3851 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3852 // init symbol's owner).
3853 ClassSymbol enclClass = owner.enclClass();
3854 Name initName = owner.isStatic() ? names.clinit : names.init;
3855 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3856 initName, initBlockType, enclClass);
3857 initSym.params = List.nil();
3858 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3859 } else {
3860 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3861 }
3862 lambdaEnv.info.yieldResult = null;
3863 lambdaEnv.info.isLambda = true;
3864 return lambdaEnv;
3865 }
3866
3867 @Override
3868 public void visitReference(final JCMemberReference that) {
3869 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3870 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3871 //method reference only allowed in assignment or method invocation/cast context
3872 log.error(that.pos(), Errors.UnexpectedMref);
3873 }
3874 result = that.type = types.createErrorType(pt());
3875 return;
3876 }
3877 final Env<AttrContext> localEnv = env.dup(that);
3878 try {
3879 //attribute member reference qualifier - if this is a constructor
3880 //reference, the expected kind must be a type
3881 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3882
3883 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3884 exprType = chk.checkConstructorRefType(that.expr, exprType);
3885 if (!exprType.isErroneous() &&
3886 exprType.isRaw() &&
3887 that.typeargs != null) {
3888 log.error(that.expr.pos(),
3889 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3890 Fragments.MrefInferAndExplicitParams));
3891 exprType = types.createErrorType(exprType);
3892 }
3893 }
3894
3895 if (exprType.isErroneous()) {
3896 //if the qualifier expression contains problems,
3897 //give up attribution of method reference
3898 result = that.type = exprType;
3899 return;
3900 }
3901
3902 if (TreeInfo.isStaticSelector(that.expr, names)) {
3903 //if the qualifier is a type, validate it; raw warning check is
3904 //omitted as we don't know at this stage as to whether this is a
3905 //raw selector (because of inference)
3906 chk.validate(that.expr, env, false);
3907 } else {
3908 Symbol lhsSym = TreeInfo.symbol(that.expr);
3909 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3910 }
3911 //attrib type-arguments
3912 List<Type> typeargtypes = List.nil();
3913 if (that.typeargs != null) {
3914 typeargtypes = attribTypes(that.typeargs, localEnv);
3915 }
3916
3917 boolean isTargetSerializable =
3918 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3919 rs.isSerializable(pt());
3920 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3921 Type currentTarget = targetInfo.target;
3922 Type desc = targetInfo.descriptor;
3923
3924 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3925 List<Type> argtypes = desc.getParameterTypes();
3926 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3927
3928 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3929 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3930 }
3931
3932 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3933 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3934 try {
3935 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3936 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3937 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3938 } finally {
3939 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3940 }
3941
3942 Symbol refSym = refResult.fst;
3943 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3944
3945 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3946 * JDK-8075541
3947 */
3948 if (refSym.kind != MTH) {
3949 boolean targetError;
3950 switch (refSym.kind) {
3951 case ABSENT_MTH:
3952 targetError = false;
3953 break;
3954 case WRONG_MTH:
3955 case WRONG_MTHS:
3956 case AMBIGUOUS:
3957 case HIDDEN:
3958 case STATICERR:
3959 targetError = true;
3960 break;
3961 default:
3962 Assert.error("unexpected result kind " + refSym.kind);
3963 targetError = false;
3964 }
3965
3966 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3967 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3968 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3969
3970 JCDiagnostic diag = diags.create(log.currentSource(), that,
3971 targetError ?
3972 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3973 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3974
3975 if (targetError && currentTarget == Type.recoveryType) {
3976 //a target error doesn't make sense during recovery stage
3977 //as we don't know what actual parameter types are
3978 result = that.type = currentTarget;
3979 return;
3980 } else {
3981 if (targetError) {
3982 resultInfo.checkContext.report(that, diag);
3983 } else {
3984 log.report(diag);
3985 }
3986 result = that.type = types.createErrorType(currentTarget);
3987 return;
3988 }
3989 }
3990
3991 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3992 that.kind = lookupHelper.referenceKind(that.sym);
3993 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3994
3995 if (desc.getReturnType() == Type.recoveryType) {
3996 // stop here
3997 result = that.type = currentTarget;
3998 return;
3999 }
4000
4001 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
4002 checkNewInnerClass(that.pos(), env, exprType, false);
4003 }
4004
4005 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
4006
4007 if (that.getMode() == ReferenceMode.INVOKE &&
4008 TreeInfo.isStaticSelector(that.expr, names) &&
4009 that.kind.isUnbound() &&
4010 lookupHelper.site.isRaw()) {
4011 chk.checkRaw(that.expr, localEnv);
4012 }
4013
4014 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
4015 exprType.getTypeArguments().nonEmpty()) {
4016 //static ref with class type-args
4017 log.error(that.expr.pos(),
4018 Errors.InvalidMref(Kinds.kindName(that.getMode()),
4019 Fragments.StaticMrefWithTargs));
4020 result = that.type = types.createErrorType(currentTarget);
4021 return;
4022 }
4023
4024 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
4025 // Check that super-qualified symbols are not abstract (JLS)
4026 rs.checkNonAbstract(that.pos(), that.sym);
4027 }
4028
4029 if (isTargetSerializable) {
4030 chk.checkAccessFromSerializableElement(that, true);
4031 }
4032 }
4033
4034 ResultInfo checkInfo =
4035 resultInfo.dup(newMethodTemplate(
4036 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
4037 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
4038 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
4039
4040 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
4041
4042 if (that.kind.isUnbound() &&
4043 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
4044 //re-generate inference constraints for unbound receiver
4045 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
4046 //cannot happen as this has already been checked - we just need
4047 //to regenerate the inference constraints, as that has been lost
4048 //as a result of the call to inferenceContext.save()
4049 Assert.error("Can't get here");
4050 }
4051 }
4052
4053 if (!refType.isErroneous()) {
4054 refType = types.createMethodTypeWithReturn(refType,
4055 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
4056 }
4057
4058 //go ahead with standard method reference compatibility check - note that param check
4059 //is a no-op (as this has been taken care during method applicability)
4060 boolean isSpeculativeRound =
4061 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
4062
4063 that.type = currentTarget; //avoids recovery at this stage
4064 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
4065 if (!isSpeculativeRound) {
4066 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
4067 }
4068 chk.checkRequiresIdentity(that, localEnv.info.lint);
4069 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
4070 } catch (Types.FunctionDescriptorLookupError ex) {
4071 JCDiagnostic cause = ex.getDiagnostic();
4072 resultInfo.checkContext.report(that, cause);
4073 result = that.type = types.createErrorType(pt());
4074 return;
4075 }
4076 }
4077 //where
4078 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
4079 //if this is a constructor reference, the expected kind must be a type
4080 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
4081 KindSelector.VAL_TYP : KindSelector.TYP,
4082 Type.noType);
4083 }
4084
4085
4086 @SuppressWarnings("fallthrough")
4087 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
4088 InferenceContext inferenceContext = checkContext.inferenceContext();
4089 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
4090
4091 Type resType;
4092 switch (tree.getMode()) {
4093 case NEW:
4094 if (!tree.expr.type.isRaw()) {
4095 resType = tree.expr.type;
4096 break;
4097 }
4098 default:
4099 resType = refType.getReturnType();
4100 }
4101
4102 Type incompatibleReturnType = resType;
4103
4104 if (returnType.hasTag(VOID)) {
4105 incompatibleReturnType = null;
4106 }
4107
4108 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
4109 if (resType.isErroneous() ||
4110 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
4111 checkContext.checkWarner(tree, resType, returnType))) {
4112 incompatibleReturnType = null;
4113 }
4114 }
4115
4116 if (incompatibleReturnType != null) {
4117 Fragment msg =
4118 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
4119 checkContext.report(tree, diags.fragment(msg));
4120 } else {
4121 if (inferenceContext.free(refType)) {
4122 // we need to wait for inference to finish and then replace inference vars in the referent type
4123 inferenceContext.addFreeTypeListener(List.of(refType),
4124 instantiatedContext -> {
4125 tree.referentType = instantiatedContext.asInstType(refType);
4126 });
4127 } else {
4128 tree.referentType = refType;
4129 }
4130 }
4131
4132 if (!speculativeAttr) {
4133 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
4134 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
4135 }
4136 }
4137 }
4138
4139 boolean checkExConstraints(
4140 List<Type> thrownByFuncExpr,
4141 List<Type> thrownAtFuncType,
4142 InferenceContext inferenceContext) {
4143 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
4144 * are not proper types
4145 */
4146 List<Type> nonProperList = thrownAtFuncType.stream()
4147 .filter(e -> inferenceContext.free(e)).collect(List.collector());
4148 List<Type> properList = thrownAtFuncType.diff(nonProperList);
4149
4150 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
4151 * in the throws clause of the invocation type of the method reference's compile-time
4152 * declaration
4153 */
4154 List<Type> checkedList = thrownByFuncExpr.stream()
4155 .filter(e -> chk.isChecked(e)).collect(List.collector());
4156
4157 /** If n = 0 (the function type's throws clause consists only of proper types), then
4158 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
4159 * in the throws clause, the constraint reduces to false; otherwise, the constraint
4160 * reduces to true
4161 */
4162 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
4163 for (Type checked : checkedList) {
4164 boolean isSubtype = false;
4165 for (Type proper : properList) {
4166 if (types.isSubtype(checked, proper)) {
4167 isSubtype = true;
4168 break;
4169 }
4170 }
4171 if (!isSubtype) {
4172 uncaughtByProperTypes.add(checked);
4173 }
4174 }
4175
4176 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
4177 return false;
4178 }
4179
4180 /** If n > 0, the constraint reduces to a set of subtyping constraints:
4181 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
4182 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
4183 */
4184 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
4185 uncaughtByProperTypes.forEach(checkedEx -> {
4186 nonProperAsUndet.forEach(nonProper -> {
4187 types.isSubtype(checkedEx, nonProper);
4188 });
4189 });
4190
4191 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
4192 */
4193 nonProperAsUndet.stream()
4194 .filter(t -> t.hasTag(UNDETVAR))
4195 .forEach(t -> ((UndetVar)t).setThrow());
4196 return true;
4197 }
4198
4199 /**
4200 * Set functional type info on the underlying AST. Note: as the target descriptor
4201 * might contain inference variables, we might need to register an hook in the
4202 * current inference context.
4203 */
4204 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4205 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4206 if (checkContext.inferenceContext().free(descriptorType)) {
4207 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4208 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4209 inferenceContext.asInstType(primaryTarget), checkContext));
4210 } else {
4211 fExpr.owner = env.info.scope.owner;
4212 if (pt.hasTag(CLASS)) {
4213 fExpr.target = primaryTarget;
4214 }
4215 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4216 pt != Type.recoveryType) {
4217 //check that functional interface class is well-formed
4218 try {
4219 /* Types.makeFunctionalInterfaceClass() may throw an exception
4220 * when it's executed post-inference. See the listener code
4221 * above.
4222 */
4223 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4224 names.empty, fExpr.target, ABSTRACT);
4225 if (csym != null) {
4226 chk.checkImplementations(env.tree, csym, csym);
4227 try {
4228 //perform an additional functional interface check on the synthetic class,
4229 //as there may be spurious errors for raw targets - because of existing issues
4230 //with membership and inheritance (see JDK-8074570).
4231 csym.flags_field |= INTERFACE;
4232 types.findDescriptorType(csym.type);
4233 } catch (FunctionDescriptorLookupError err) {
4234 resultInfo.checkContext.report(fExpr,
4235 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4236 }
4237 }
4238 } catch (Types.FunctionDescriptorLookupError ex) {
4239 JCDiagnostic cause = ex.getDiagnostic();
4240 resultInfo.checkContext.report(env.tree, cause);
4241 }
4242 }
4243 }
4244 }
4245
4246 public void visitParens(JCParens tree) {
4247 Type owntype = attribTree(tree.expr, env, resultInfo);
4248 result = check(tree, owntype, pkind(), resultInfo);
4249 Symbol sym = TreeInfo.symbol(tree);
4250 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4251 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4252 }
4253
4254 public void visitAssign(JCAssign tree) {
4255 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4256 Type capturedType = capture(owntype);
4257 attribExpr(tree.rhs, env, owntype);
4258 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4259 }
4260
4261 public void visitAssignop(JCAssignOp tree) {
4262 // Attribute arguments.
4263 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4264 Type operand = attribExpr(tree.rhs, env);
4265 // Find operator.
4266 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4267 if (operator != operators.noOpSymbol &&
4268 !owntype.isErroneous() &&
4269 !operand.isErroneous()) {
4270 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4271 chk.checkCastable(tree.rhs.pos(),
4272 operator.type.getReturnType(),
4273 owntype);
4274 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4275 }
4276 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4277 }
4278
4279 public void visitUnary(JCUnary tree) {
4280 // Attribute arguments.
4281 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4282 ? attribTree(tree.arg, env, varAssignmentInfo)
4283 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4284
4285 // Find operator.
4286 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4287 Type owntype = types.createErrorType(tree.type);
4288 if (operator != operators.noOpSymbol &&
4289 !argtype.isErroneous()) {
4290 owntype = (tree.getTag().isIncOrDecUnaryOp())
4291 ? tree.arg.type
4292 : operator.type.getReturnType();
4293 int opc = operator.opcode;
4294
4295 // If the argument is constant, fold it.
4296 if (argtype.constValue() != null) {
4297 Type ctype = cfolder.fold1(opc, argtype);
4298 if (ctype != null) {
4299 owntype = cfolder.coerce(ctype, owntype);
4300 }
4301 }
4302 }
4303 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4304 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4305 }
4306
4307 public void visitBinary(JCBinary tree) {
4308 // Attribute arguments.
4309 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4310 // x && y
4311 // include x's bindings when true in y
4312
4313 // x || y
4314 // include x's bindings when false in y
4315
4316 MatchBindings lhsBindings = matchBindings;
4317 List<BindingSymbol> propagatedBindings;
4318 switch (tree.getTag()) {
4319 case AND:
4320 propagatedBindings = lhsBindings.bindingsWhenTrue;
4321 break;
4322 case OR:
4323 propagatedBindings = lhsBindings.bindingsWhenFalse;
4324 break;
4325 default:
4326 propagatedBindings = List.nil();
4327 break;
4328 }
4329 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4330 Type right;
4331 try {
4332 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4333 } finally {
4334 rhsEnv.info.scope.leave();
4335 }
4336
4337 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4338
4339 // Find operator.
4340 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4341 Type owntype = types.createErrorType(tree.type);
4342 if (operator != operators.noOpSymbol &&
4343 !left.isErroneous() &&
4344 !right.isErroneous()) {
4345 owntype = operator.type.getReturnType();
4346 int opc = operator.opcode;
4347 // If both arguments are constants, fold them.
4348 if (left.constValue() != null && right.constValue() != null) {
4349 Type ctype = cfolder.fold2(opc, left, right);
4350 if (ctype != null) {
4351 owntype = cfolder.coerce(ctype, owntype);
4352 }
4353 }
4354
4355 // Check that argument types of a reference ==, != are
4356 // castable to each other, (JLS 15.21). Note: unboxing
4357 // comparisons will not have an acmp* opc at this point.
4358 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4359 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4360 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4361 }
4362 }
4363
4364 chk.checkDivZero(tree.rhs.pos(), operator, right);
4365 }
4366 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4367 }
4368
4369 public void visitTypeCast(final JCTypeCast tree) {
4370 Type clazztype = attribType(tree.clazz, env);
4371 chk.validate(tree.clazz, env, false);
4372 chk.checkRequiresIdentity(tree, env.info.lint);
4373 //a fresh environment is required for 292 inference to work properly ---
4374 //see Infer.instantiatePolymorphicSignatureInstance()
4375 Env<AttrContext> localEnv = env.dup(tree);
4376 //should we propagate the target type?
4377 final ResultInfo castInfo;
4378 JCExpression expr = TreeInfo.skipParens(tree.expr);
4379 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4380 if (isPoly) {
4381 //expression is a poly - we need to propagate target type info
4382 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4383 new Check.NestedCheckContext(resultInfo.checkContext) {
4384 @Override
4385 public boolean compatible(Type found, Type req, Warner warn) {
4386 return types.isCastable(found, req, warn);
4387 }
4388 });
4389 } else {
4390 //standalone cast - target-type info is not propagated
4391 castInfo = unknownExprInfo;
4392 }
4393 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4394 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4395 if (exprtype.constValue() != null)
4396 owntype = cfolder.coerce(exprtype, owntype);
4397 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4398 if (!isPoly)
4399 chk.checkRedundantCast(localEnv, tree);
4400 }
4401
4402 public void visitTypeTest(JCInstanceOf tree) {
4403 Type exprtype = attribExpr(tree.expr, env);
4404 if (exprtype.isPrimitive()) {
4405 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4406 } else {
4407 exprtype = chk.checkNullOrRefType(
4408 tree.expr.pos(), exprtype);
4409 }
4410 Type clazztype;
4411 JCTree typeTree;
4412 if (tree.pattern.getTag() == BINDINGPATTERN ||
4413 tree.pattern.getTag() == RECORDPATTERN) {
4414 attribExpr(tree.pattern, env, exprtype);
4415 clazztype = tree.pattern.type;
4416 if (types.isSubtype(exprtype, clazztype) &&
4417 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4418 tree.pattern.getTag() != RECORDPATTERN) {
4419 if (!allowUnconditionalPatternsInstanceOf) {
4420 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4421 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4422 }
4423 }
4424 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4425 } else {
4426 clazztype = attribType(tree.pattern, env);
4427 typeTree = tree.pattern;
4428 chk.validate(typeTree, env, false);
4429 }
4430 if (clazztype.isPrimitive()) {
4431 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4432 } else {
4433 if (!clazztype.hasTag(TYPEVAR)) {
4434 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4435 }
4436 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4437 boolean valid = false;
4438 if (allowReifiableTypesInInstanceof) {
4439 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4440 } else {
4441 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4442 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4443 allowReifiableTypesInInstanceof = true;
4444 }
4445 if (!valid) {
4446 clazztype = types.createErrorType(clazztype);
4447 }
4448 }
4449 }
4450 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4451 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4452 }
4453
4454 private boolean checkCastablePattern(DiagnosticPosition pos,
4455 Type exprType,
4456 Type pattType) {
4457 Warner warner = new Warner();
4458 // if any type is erroneous, the problem is reported elsewhere
4459 if (exprType.isErroneous() || pattType.isErroneous()) {
4460 return false;
4461 }
4462 if (!types.isCastable(exprType, pattType, warner)) {
4463 chk.basicHandler.report(pos,
4464 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4465 return false;
4466 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4467 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4468 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4469 return true;
4470 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4471 log.error(pos,
4472 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4473 return false;
4474 } else {
4475 return true;
4476 }
4477 }
4478
4479 @Override
4480 public void visitAnyPattern(JCAnyPattern tree) {
4481 result = tree.type = resultInfo.pt;
4482 }
4483
4484 public void visitBindingPattern(JCBindingPattern tree) {
4485 Type type;
4486 if (tree.var.vartype != null) {
4487 type = attribType(tree.var.vartype, env);
4488 } else {
4489 type = resultInfo.pt;
4490 }
4491 tree.type = tree.var.type = type;
4492 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4493 v.pos = tree.pos;
4494 tree.var.sym = v;
4495 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4496 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4497 }
4498 chk.validate(tree.var.vartype, env, true);
4499 if (tree.var.isImplicitlyTyped()) {
4500 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4501 : type);
4502 }
4503 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.var);
4504 if (!tree.var.isImplicitlyTyped()) {
4505 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var);
4506 }
4507 annotate.flush();
4508 result = tree.type;
4509 if (v.isUnnamedVariable()) {
4510 matchBindings = MatchBindingsComputer.EMPTY;
4511 } else {
4512 matchBindings = new MatchBindings(List.of(v), List.nil());
4513 }
4514 chk.checkRequiresIdentity(tree, env.info.lint);
4515 }
4516
4517 @Override
4518 public void visitRecordPattern(JCRecordPattern tree) {
4519 Type site;
4520
4521 if (tree.deconstructor == null) {
4522 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4523 tree.record = syms.errSymbol;
4524 site = tree.type = types.createErrorType(tree.record.type);
4525 } else {
4526 Type type = attribType(tree.deconstructor, env);
4527 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4528 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4529 if (inferred == null) {
4530 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4531 } else {
4532 type = inferred;
4533 }
4534 }
4535 tree.type = tree.deconstructor.type = type;
4536 site = types.capture(tree.type);
4537 }
4538
4539 List<Type> expectedRecordTypes;
4540 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4541 ClassSymbol record = (ClassSymbol) site.tsym;
4542 expectedRecordTypes = record.getRecordComponents()
4543 .stream()
4544 .map(rc -> types.memberType(site, rc))
4545 .map(t -> types.upward(t, types.captures(t)).baseType())
4546 .collect(List.collector());
4547 tree.record = record;
4548 } else {
4549 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4550 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4551 .limit(tree.nested.size())
4552 .collect(List.collector());
4553 tree.record = syms.errSymbol;
4554 }
4555 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4556 List<Type> recordTypes = expectedRecordTypes;
4557 List<JCPattern> nestedPatterns = tree.nested;
4558 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4559 try {
4560 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4561 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4562 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4563 outBindings.addAll(matchBindings.bindingsWhenTrue);
4564 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4565 nestedPatterns = nestedPatterns.tail;
4566 recordTypes = recordTypes.tail;
4567 }
4568 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4569 while (nestedPatterns.nonEmpty()) {
4570 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4571 nestedPatterns = nestedPatterns.tail;
4572 }
4573 List<Type> nestedTypes =
4574 tree.nested.stream().map(p -> p.type).collect(List.collector());
4575 log.error(tree.pos(),
4576 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4577 nestedTypes));
4578 }
4579 } finally {
4580 localEnv.info.scope.leave();
4581 }
4582 chk.validate(tree.deconstructor, env, true);
4583 result = tree.type;
4584 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4585 }
4586
4587 public void visitIndexed(JCArrayAccess tree) {
4588 Type owntype = types.createErrorType(tree.type);
4589 Type atype = attribExpr(tree.indexed, env);
4590 attribExpr(tree.index, env, syms.intType);
4591 if (types.isArray(atype))
4592 owntype = types.elemtype(atype);
4593 else if (!atype.hasTag(ERROR))
4594 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4595 if (!pkind().contains(KindSelector.VAL))
4596 owntype = capture(owntype);
4597 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4598 }
4599
4600 public void visitIdent(JCIdent tree) {
4601 Symbol sym;
4602
4603 // Find symbol
4604 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4605 // If we are looking for a method, the prototype `pt' will be a
4606 // method type with the type of the call's arguments as parameters.
4607 env.info.pendingResolutionPhase = null;
4608 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4609 } else if (tree.sym != null && tree.sym.kind != VAR) {
4610 sym = tree.sym;
4611 } else {
4612 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4613 }
4614 tree.sym = sym;
4615
4616 // Also find the environment current for the class where
4617 // sym is defined (`symEnv').
4618 Env<AttrContext> symEnv = env;
4619 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4620 sym.kind.matches(KindSelector.VAL_MTH) &&
4621 sym.owner.kind == TYP &&
4622 tree.name != names._this && tree.name != names._super) {
4623
4624 // Find environment in which identifier is defined.
4625 while (symEnv.outer != null &&
4626 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4627 symEnv = symEnv.outer;
4628 }
4629 }
4630
4631 // If symbol is a variable, ...
4632 if (sym.kind == VAR) {
4633 VarSymbol v = (VarSymbol)sym;
4634
4635 // ..., evaluate its initializer, if it has one, and check for
4636 // illegal forward reference.
4637 checkInit(tree, env, v, false);
4638
4639 // If we are expecting a variable (as opposed to a value), check
4640 // that the variable is assignable in the current environment.
4641 if (KindSelector.ASG.subset(pkind()))
4642 checkAssignable(tree.pos(), v, null, env);
4643 }
4644
4645 Env<AttrContext> env1 = env;
4646 if (sym.kind != ERR && sym.kind != TYP &&
4647 sym.owner != null && sym.owner != env1.enclClass.sym) {
4648 // If the found symbol is inaccessible, then it is
4649 // accessed through an enclosing instance. Locate this
4650 // enclosing instance:
4651 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4652 env1 = env1.outer;
4653 }
4654
4655 if (env.info.isSerializable) {
4656 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4657 }
4658
4659 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4660 }
4661
4662 public void visitSelect(JCFieldAccess tree) {
4663 // Determine the expected kind of the qualifier expression.
4664 KindSelector skind = KindSelector.NIL;
4665 if (tree.name == names._this || tree.name == names._super ||
4666 tree.name == names._class)
4667 {
4668 skind = KindSelector.TYP;
4669 } else {
4670 if (pkind().contains(KindSelector.PCK))
4671 skind = KindSelector.of(skind, KindSelector.PCK);
4672 if (pkind().contains(KindSelector.TYP))
4673 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4674 if (pkind().contains(KindSelector.VAL_MTH))
4675 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4676 }
4677
4678 // Attribute the qualifier expression, and determine its symbol (if any).
4679 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4680 Assert.check(site == tree.selected.type);
4681 if (!pkind().contains(KindSelector.TYP_PCK))
4682 site = capture(site); // Capture field access
4683
4684 // don't allow T.class T[].class, etc
4685 if (skind == KindSelector.TYP) {
4686 Type elt = site;
4687 while (elt.hasTag(ARRAY))
4688 elt = ((ArrayType)elt).elemtype;
4689 if (elt.hasTag(TYPEVAR)) {
4690 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4691 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4692 tree.sym = tree.type.tsym;
4693 return ;
4694 }
4695 }
4696
4697 // If qualifier symbol is a type or `super', assert `selectSuper'
4698 // for the selection. This is relevant for determining whether
4699 // protected symbols are accessible.
4700 Symbol sitesym = TreeInfo.symbol(tree.selected);
4701 boolean selectSuperPrev = env.info.selectSuper;
4702 env.info.selectSuper =
4703 sitesym != null &&
4704 sitesym.name == names._super;
4705
4706 // Determine the symbol represented by the selection.
4707 env.info.pendingResolutionPhase = null;
4708 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4709 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4710 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4711 sym = syms.errSymbol;
4712 }
4713 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4714 site = capture(site);
4715 sym = selectSym(tree, sitesym, site, env, resultInfo);
4716 }
4717 boolean varArgs = env.info.lastResolveVarargs();
4718 tree.sym = sym;
4719
4720 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4721 site = types.skipTypeVars(site, true);
4722 }
4723
4724 // If that symbol is a variable, ...
4725 if (sym.kind == VAR) {
4726 VarSymbol v = (VarSymbol)sym;
4727
4728 // ..., evaluate its initializer, if it has one, and check for
4729 // illegal forward reference.
4730 checkInit(tree, env, v, true);
4731
4732 // If we are expecting a variable (as opposed to a value), check
4733 // that the variable is assignable in the current environment.
4734 if (KindSelector.ASG.subset(pkind()))
4735 checkAssignable(tree.pos(), v, tree.selected, env);
4736 }
4737
4738 if (sitesym != null &&
4739 sitesym.kind == VAR &&
4740 ((VarSymbol)sitesym).isResourceVariable() &&
4741 sym.kind == MTH &&
4742 sym.name.equals(names.close) &&
4743 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4744 env.info.lint.logIfEnabled(tree, LintWarnings.TryExplicitCloseCall);
4745 }
4746
4747 // Disallow selecting a type from an expression
4748 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4749 tree.type = check(tree.selected, pt(),
4750 sitesym == null ?
4751 KindSelector.VAL : sitesym.kind.toSelector(),
4752 new ResultInfo(KindSelector.TYP_PCK, pt()));
4753 }
4754
4755 if (isType(sitesym)) {
4756 if (sym.name != names._this && sym.name != names._super) {
4757 // Check if type-qualified fields or methods are static (JLS)
4758 if ((sym.flags() & STATIC) == 0 &&
4759 sym.name != names._super &&
4760 (sym.kind == VAR || sym.kind == MTH)) {
4761 rs.accessBase(rs.new StaticError(sym),
4762 tree.pos(), site, sym.name, true);
4763 }
4764 }
4765 } else if (sym.kind != ERR &&
4766 (sym.flags() & STATIC) != 0 &&
4767 sym.name != names._class) {
4768 // If the qualified item is not a type and the selected item is static, report
4769 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4770 if (!sym.owner.isAnonymous()) {
4771 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4772 } else {
4773 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4774 }
4775 }
4776
4777 // If we are selecting an instance member via a `super', ...
4778 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4779
4780 // Check that super-qualified symbols are not abstract (JLS)
4781 rs.checkNonAbstract(tree.pos(), sym);
4782
4783 if (site.isRaw()) {
4784 // Determine argument types for site.
4785 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4786 if (site1 != null) site = site1;
4787 }
4788 }
4789
4790 if (env.info.isSerializable) {
4791 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4792 }
4793
4794 env.info.selectSuper = selectSuperPrev;
4795 result = checkId(tree, site, sym, env, resultInfo);
4796 }
4797 //where
4798 /** Determine symbol referenced by a Select expression,
4799 *
4800 * @param tree The select tree.
4801 * @param site The type of the selected expression,
4802 * @param env The current environment.
4803 * @param resultInfo The current result.
4804 */
4805 private Symbol selectSym(JCFieldAccess tree,
4806 Symbol location,
4807 Type site,
4808 Env<AttrContext> env,
4809 ResultInfo resultInfo) {
4810 DiagnosticPosition pos = tree.pos();
4811 Name name = tree.name;
4812 switch (site.getTag()) {
4813 case PACKAGE:
4814 return rs.accessBase(
4815 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4816 pos, location, site, name, true);
4817 case ARRAY:
4818 case CLASS:
4819 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4820 return rs.resolveQualifiedMethod(
4821 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4822 } else if (name == names._this || name == names._super) {
4823 return rs.resolveSelf(pos, env, site.tsym, tree);
4824 } else if (name == names._class) {
4825 // In this case, we have already made sure in
4826 // visitSelect that qualifier expression is a type.
4827 return syms.getClassField(site, types);
4828 } else {
4829 // We are seeing a plain identifier as selector.
4830 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4831 sym = rs.accessBase(sym, pos, location, site, name, true);
4832 return sym;
4833 }
4834 case WILDCARD:
4835 throw new AssertionError(tree);
4836 case TYPEVAR:
4837 // Normally, site.getUpperBound() shouldn't be null.
4838 // It should only happen during memberEnter/attribBase
4839 // when determining the supertype which *must* be
4840 // done before attributing the type variables. In
4841 // other words, we are seeing this illegal program:
4842 // class B<T> extends A<T.foo> {}
4843 Symbol sym = (site.getUpperBound() != null)
4844 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4845 : null;
4846 if (sym == null) {
4847 log.error(pos, Errors.TypeVarCantBeDeref);
4848 return syms.errSymbol;
4849 } else {
4850 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4851 rs.new AccessError(env, site, sym) :
4852 sym;
4853 rs.accessBase(sym2, pos, location, site, name, true);
4854 return sym;
4855 }
4856 case ERROR:
4857 // preserve identifier names through errors
4858 return types.createErrorType(name, site.tsym, site).tsym;
4859 default:
4860 // The qualifier expression is of a primitive type -- only
4861 // .class is allowed for these.
4862 if (name == names._class) {
4863 // In this case, we have already made sure in Select that
4864 // qualifier expression is a type.
4865 return syms.getClassField(site, types);
4866 } else {
4867 log.error(pos, Errors.CantDeref(site));
4868 return syms.errSymbol;
4869 }
4870 }
4871 }
4872
4873 /** Determine type of identifier or select expression and check that
4874 * (1) the referenced symbol is not deprecated
4875 * (2) the symbol's type is safe (@see checkSafe)
4876 * (3) if symbol is a variable, check that its type and kind are
4877 * compatible with the prototype and protokind.
4878 * (4) if symbol is an instance field of a raw type,
4879 * which is being assigned to, issue an unchecked warning if its
4880 * type changes under erasure.
4881 * (5) if symbol is an instance method of a raw type, issue an
4882 * unchecked warning if its argument types change under erasure.
4883 * If checks succeed:
4884 * If symbol is a constant, return its constant type
4885 * else if symbol is a method, return its result type
4886 * otherwise return its type.
4887 * Otherwise return errType.
4888 *
4889 * @param tree The syntax tree representing the identifier
4890 * @param site If this is a select, the type of the selected
4891 * expression, otherwise the type of the current class.
4892 * @param sym The symbol representing the identifier.
4893 * @param env The current environment.
4894 * @param resultInfo The expected result
4895 */
4896 Type checkId(JCTree tree,
4897 Type site,
4898 Symbol sym,
4899 Env<AttrContext> env,
4900 ResultInfo resultInfo) {
4901 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4902 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4903 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4904 }
4905
4906 Type checkMethodIdInternal(JCTree tree,
4907 Type site,
4908 Symbol sym,
4909 Env<AttrContext> env,
4910 ResultInfo resultInfo) {
4911 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4912 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4913 } else {
4914 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4915 }
4916 }
4917
4918 Type checkIdInternal(JCTree tree,
4919 Type site,
4920 Symbol sym,
4921 Type pt,
4922 Env<AttrContext> env,
4923 ResultInfo resultInfo) {
4924 Type owntype; // The computed type of this identifier occurrence.
4925 switch (sym.kind) {
4926 case TYP:
4927 // For types, the computed type equals the symbol's type,
4928 // except for two situations:
4929 owntype = sym.type;
4930 if (owntype.hasTag(CLASS)) {
4931 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4932 Type ownOuter = owntype.getEnclosingType();
4933
4934 // (a) If the symbol's type is parameterized, erase it
4935 // because no type parameters were given.
4936 // We recover generic outer type later in visitTypeApply.
4937 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4938 owntype = types.erasure(owntype);
4939 }
4940
4941 // (b) If the symbol's type is an inner class, then
4942 // we have to interpret its outer type as a superclass
4943 // of the site type. Example:
4944 //
4945 // class Tree<A> { class Visitor { ... } }
4946 // class PointTree extends Tree<Point> { ... }
4947 // ...PointTree.Visitor...
4948 //
4949 // Then the type of the last expression above is
4950 // Tree<Point>.Visitor.
4951 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4952 Type normOuter = site;
4953 if (normOuter.hasTag(CLASS)) {
4954 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4955 }
4956 if (normOuter == null) // perhaps from an import
4957 normOuter = types.erasure(ownOuter);
4958 if (normOuter != ownOuter)
4959 owntype = new ClassType(
4960 normOuter, List.nil(), owntype.tsym,
4961 owntype.getMetadata());
4962 }
4963 }
4964 break;
4965 case VAR:
4966 VarSymbol v = (VarSymbol)sym;
4967
4968 if (env.info.enclVar != null
4969 && v.type.hasTag(NONE)) {
4970 //self reference to implicitly typed variable declaration
4971 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4972 return tree.type = v.type = types.createErrorType(v.type);
4973 }
4974
4975 // Test (4): if symbol is an instance field of a raw type,
4976 // which is being assigned to, issue an unchecked warning if
4977 // its type changes under erasure.
4978 if (KindSelector.ASG.subset(pkind()) &&
4979 v.owner.kind == TYP &&
4980 (v.flags() & STATIC) == 0 &&
4981 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4982 Type s = types.asOuterSuper(site, v.owner);
4983 if (s != null &&
4984 s.isRaw() &&
4985 !types.isSameType(v.type, v.erasure(types))) {
4986 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4987 }
4988 }
4989 // The computed type of a variable is the type of the
4990 // variable symbol, taken as a member of the site type.
4991 owntype = (sym.owner.kind == TYP &&
4992 sym.name != names._this && sym.name != names._super)
4993 ? types.memberType(site, sym)
4994 : sym.type;
4995
4996 // If the variable is a constant, record constant value in
4997 // computed type.
4998 if (v.getConstValue() != null && isStaticReference(tree))
4999 owntype = owntype.constType(v.getConstValue());
5000
5001 if (resultInfo.pkind == KindSelector.VAL) {
5002 owntype = capture(owntype); // capture "names as expressions"
5003 }
5004 break;
5005 case MTH: {
5006 owntype = checkMethod(site, sym,
5007 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
5008 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
5009 resultInfo.pt.getTypeArguments());
5010 chk.checkRestricted(tree.pos(), sym);
5011 break;
5012 }
5013 case PCK: case ERR:
5014 owntype = sym.type;
5015 break;
5016 default:
5017 throw new AssertionError("unexpected kind: " + sym.kind +
5018 " in tree " + tree);
5019 }
5020
5021 // Emit a `deprecation' warning if symbol is deprecated.
5022 // (for constructors (but not for constructor references), the error
5023 // was given when the constructor was resolved)
5024
5025 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
5026 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
5027 chk.checkSunAPI(tree.pos(), sym);
5028 chk.checkProfile(tree.pos(), sym);
5029 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
5030 }
5031
5032 if (pt.isErroneous()) {
5033 owntype = types.createErrorType(owntype);
5034 }
5035
5036 // If symbol is a variable, check that its type and
5037 // kind are compatible with the prototype and protokind.
5038 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
5039 }
5040
5041 /** Check that variable is initialized and evaluate the variable's
5042 * initializer, if not yet done. Also check that variable is not
5043 * referenced before it is defined.
5044 * @param tree The tree making up the variable reference.
5045 * @param env The current environment.
5046 * @param v The variable's symbol.
5047 */
5048 private void checkInit(JCTree tree,
5049 Env<AttrContext> env,
5050 VarSymbol v,
5051 boolean onlyWarning) {
5052 // A forward reference is diagnosed if the declaration position
5053 // of the variable is greater than the current tree position
5054 // and the tree and variable definition occur in the same class
5055 // definition. Note that writes don't count as references.
5056 // This check applies only to class and instance
5057 // variables. Local variables follow different scope rules,
5058 // and are subject to definite assignment checking.
5059 Env<AttrContext> initEnv = enclosingInitEnv(env);
5060 if (initEnv != null &&
5061 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
5062 v.owner.kind == TYP &&
5063 v.owner == env.info.scope.owner.enclClass() &&
5064 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
5065 (!env.tree.hasTag(ASSIGN) ||
5066 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
5067 if (!onlyWarning || isStaticEnumField(v)) {
5068 Error errkey = (initEnv.info.enclVar == v) ?
5069 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
5070 log.error(tree.pos(), errkey);
5071 } else if (useBeforeDeclarationWarning) {
5072 Warning warnkey = (initEnv.info.enclVar == v) ?
5073 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
5074 log.warning(tree.pos(), warnkey);
5075 }
5076 }
5077
5078 v.getConstValue(); // ensure initializer is evaluated
5079
5080 checkEnumInitializer(tree, env, v);
5081 }
5082
5083 /**
5084 * Returns the enclosing init environment associated with this env (if any). An init env
5085 * can be either a field declaration env or a static/instance initializer env.
5086 */
5087 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
5088 while (true) {
5089 switch (env.tree.getTag()) {
5090 case VARDEF:
5091 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
5092 if (vdecl.sym.owner.kind == TYP) {
5093 //field
5094 return env;
5095 }
5096 break;
5097 case BLOCK:
5098 if (env.next.tree.hasTag(CLASSDEF)) {
5099 //instance/static initializer
5100 return env;
5101 }
5102 break;
5103 case METHODDEF:
5104 case CLASSDEF:
5105 case TOPLEVEL:
5106 return null;
5107 }
5108 Assert.checkNonNull(env.next);
5109 env = env.next;
5110 }
5111 }
5112
5113 /**
5114 * Check for illegal references to static members of enum. In
5115 * an enum type, constructors and initializers may not
5116 * reference its static members unless they are constant.
5117 *
5118 * @param tree The tree making up the variable reference.
5119 * @param env The current environment.
5120 * @param v The variable's symbol.
5121 * @jls 8.9 Enum Types
5122 */
5123 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
5124 // JLS:
5125 //
5126 // "It is a compile-time error to reference a static field
5127 // of an enum type that is not a compile-time constant
5128 // (15.28) from constructors, instance initializer blocks,
5129 // or instance variable initializer expressions of that
5130 // type. It is a compile-time error for the constructors,
5131 // instance initializer blocks, or instance variable
5132 // initializer expressions of an enum constant e to refer
5133 // to itself or to an enum constant of the same type that
5134 // is declared to the right of e."
5135 if (isStaticEnumField(v)) {
5136 ClassSymbol enclClass = env.info.scope.owner.enclClass();
5137
5138 if (enclClass == null || enclClass.owner == null)
5139 return;
5140
5141 // See if the enclosing class is the enum (or a
5142 // subclass thereof) declaring v. If not, this
5143 // reference is OK.
5144 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
5145 return;
5146
5147 // If the reference isn't from an initializer, then
5148 // the reference is OK.
5149 if (!Resolve.isInitializer(env))
5150 return;
5151
5152 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
5153 }
5154 }
5155
5156 /** Is the given symbol a static, non-constant field of an Enum?
5157 * Note: enum literals should not be regarded as such
5158 */
5159 private boolean isStaticEnumField(VarSymbol v) {
5160 return Flags.isEnum(v.owner) &&
5161 Flags.isStatic(v) &&
5162 !Flags.isConstant(v) &&
5163 v.name != names._class;
5164 }
5165
5166 /**
5167 * Check that method arguments conform to its instantiation.
5168 **/
5169 public Type checkMethod(Type site,
5170 final Symbol sym,
5171 ResultInfo resultInfo,
5172 Env<AttrContext> env,
5173 final List<JCExpression> argtrees,
5174 List<Type> argtypes,
5175 List<Type> typeargtypes) {
5176 // Test (5): if symbol is an instance method of a raw type, issue
5177 // an unchecked warning if its argument types change under erasure.
5178 if ((sym.flags() & STATIC) == 0 &&
5179 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5180 Type s = types.asOuterSuper(site, sym.owner);
5181 if (s != null && s.isRaw() &&
5182 !types.isSameTypes(sym.type.getParameterTypes(),
5183 sym.erasure(types).getParameterTypes())) {
5184 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
5185 }
5186 }
5187
5188 if (env.info.defaultSuperCallSite != null) {
5189 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5190 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5191 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5192 List<MethodSymbol> icand_sup =
5193 types.interfaceCandidates(sup, (MethodSymbol)sym);
5194 if (icand_sup.nonEmpty() &&
5195 icand_sup.head != sym &&
5196 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5197 log.error(env.tree.pos(),
5198 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5199 break;
5200 }
5201 }
5202 env.info.defaultSuperCallSite = null;
5203 }
5204
5205 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5206 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5207 if (app.meth.hasTag(SELECT) &&
5208 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5209 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5210 }
5211 }
5212
5213 // Compute the identifier's instantiated type.
5214 // For methods, we need to compute the instance type by
5215 // Resolve.instantiate from the symbol's type as well as
5216 // any type arguments and value arguments.
5217 Warner noteWarner = new Warner();
5218 try {
5219 Type owntype = rs.checkMethod(
5220 env,
5221 site,
5222 sym,
5223 resultInfo,
5224 argtypes,
5225 typeargtypes,
5226 noteWarner);
5227
5228 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5229 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5230
5231 argtypes = argtypes.map(checkDeferredMap);
5232
5233 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5234 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5235 sym.name,
5236 rs.methodArguments(sym.type.getParameterTypes()),
5237 rs.methodArguments(argtypes.map(checkDeferredMap)),
5238 kindName(sym.location()),
5239 sym.location()));
5240 if (resultInfo.pt != Infer.anyPoly ||
5241 !owntype.hasTag(METHOD) ||
5242 !owntype.isPartial()) {
5243 //if this is not a partially inferred method type, erase return type. Otherwise,
5244 //erasure is carried out in PartiallyInferredMethodType.check().
5245 owntype = new MethodType(owntype.getParameterTypes(),
5246 types.erasure(owntype.getReturnType()),
5247 types.erasure(owntype.getThrownTypes()),
5248 syms.methodClass);
5249 }
5250 }
5251
5252 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5253 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5254 PolyKind.POLY : PolyKind.STANDALONE;
5255 TreeInfo.setPolyKind(env.tree, pkind);
5256
5257 return (resultInfo.pt == Infer.anyPoly) ?
5258 owntype :
5259 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5260 resultInfo.checkContext.inferenceContext());
5261 } catch (Infer.InferenceException ex) {
5262 //invalid target type - propagate exception outwards or report error
5263 //depending on the current check context
5264 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5265 return types.createErrorType(site);
5266 } catch (Resolve.InapplicableMethodException ex) {
5267 final JCDiagnostic diag = ex.getDiagnostic();
5268 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5269 @Override
5270 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5271 return new Pair<>(sym, diag);
5272 }
5273 };
5274 List<Type> argtypes2 = argtypes.map(
5275 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5276 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5277 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5278 log.report(errDiag);
5279 return types.createErrorType(site);
5280 }
5281 }
5282
5283 public void visitLiteral(JCLiteral tree) {
5284 result = check(tree, litType(tree.typetag).constType(tree.value),
5285 KindSelector.VAL, resultInfo);
5286 }
5287 //where
5288 /** Return the type of a literal with given type tag.
5289 */
5290 Type litType(TypeTag tag) {
5291 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5292 }
5293
5294 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5295 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5296 }
5297
5298 public void visitTypeArray(JCArrayTypeTree tree) {
5299 Type etype = attribType(tree.elemtype, env);
5300 Type type = new ArrayType(etype, syms.arrayClass);
5301 result = check(tree, type, KindSelector.TYP, resultInfo);
5302 }
5303
5304 /** Visitor method for parameterized types.
5305 * Bound checking is left until later, since types are attributed
5306 * before supertype structure is completely known
5307 */
5308 public void visitTypeApply(JCTypeApply tree) {
5309 Type owntype = types.createErrorType(tree.type);
5310
5311 // Attribute functor part of application and make sure it's a class.
5312 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5313
5314 // Attribute type parameters
5315 List<Type> actuals = attribTypes(tree.arguments, env);
5316
5317 if (clazztype.hasTag(CLASS)) {
5318 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5319 if (actuals.isEmpty()) //diamond
5320 actuals = formals;
5321
5322 if (actuals.length() == formals.length()) {
5323 List<Type> a = actuals;
5324 List<Type> f = formals;
5325 while (a.nonEmpty()) {
5326 a.head = a.head.withTypeVar(f.head);
5327 a = a.tail;
5328 f = f.tail;
5329 }
5330 // Compute the proper generic outer
5331 Type clazzOuter = clazztype.getEnclosingType();
5332 if (clazzOuter.hasTag(CLASS)) {
5333 Type site;
5334 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5335 if (clazz.hasTag(IDENT)) {
5336 site = env.enclClass.sym.type;
5337 } else if (clazz.hasTag(SELECT)) {
5338 site = ((JCFieldAccess) clazz).selected.type;
5339 } else throw new AssertionError(""+tree);
5340 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5341 if (site.hasTag(CLASS))
5342 site = types.asOuterSuper(site, clazzOuter.tsym);
5343 if (site == null)
5344 site = types.erasure(clazzOuter);
5345 clazzOuter = site;
5346 }
5347 }
5348 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5349 clazztype.getMetadata());
5350 } else {
5351 if (formals.length() != 0) {
5352 log.error(tree.pos(),
5353 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5354 } else {
5355 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5356 }
5357 owntype = types.createErrorType(tree.type);
5358 }
5359 } else if (clazztype.hasTag(ERROR)) {
5360 ErrorType parameterizedErroneous =
5361 new ErrorType(clazztype.getOriginalType(),
5362 clazztype.tsym,
5363 clazztype.getMetadata());
5364
5365 parameterizedErroneous.typarams_field = actuals;
5366 owntype = parameterizedErroneous;
5367 }
5368 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5369 }
5370
5371 public void visitTypeUnion(JCTypeUnion tree) {
5372 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5373 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5374 for (JCExpression typeTree : tree.alternatives) {
5375 Type ctype = attribType(typeTree, env);
5376 ctype = chk.checkType(typeTree.pos(),
5377 chk.checkClassType(typeTree.pos(), ctype),
5378 syms.throwableType);
5379 if (!ctype.isErroneous()) {
5380 //check that alternatives of a union type are pairwise
5381 //unrelated w.r.t. subtyping
5382 if (chk.intersects(ctype, multicatchTypes.toList())) {
5383 for (Type t : multicatchTypes) {
5384 boolean sub = types.isSubtype(ctype, t);
5385 boolean sup = types.isSubtype(t, ctype);
5386 if (sub || sup) {
5387 //assume 'a' <: 'b'
5388 Type a = sub ? ctype : t;
5389 Type b = sub ? t : ctype;
5390 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5391 }
5392 }
5393 }
5394 multicatchTypes.append(ctype);
5395 if (all_multicatchTypes != null)
5396 all_multicatchTypes.append(ctype);
5397 } else {
5398 if (all_multicatchTypes == null) {
5399 all_multicatchTypes = new ListBuffer<>();
5400 all_multicatchTypes.appendList(multicatchTypes);
5401 }
5402 all_multicatchTypes.append(ctype);
5403 }
5404 }
5405 Type t = check(tree, types.lub(multicatchTypes.toList()),
5406 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5407 if (t.hasTag(CLASS)) {
5408 List<Type> alternatives =
5409 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5410 t = new UnionClassType((ClassType) t, alternatives);
5411 }
5412 tree.type = result = t;
5413 }
5414
5415 public void visitTypeIntersection(JCTypeIntersection tree) {
5416 attribTypes(tree.bounds, env);
5417 tree.type = result = checkIntersection(tree, tree.bounds);
5418 }
5419
5420 public void visitTypeParameter(JCTypeParameter tree) {
5421 TypeVar typeVar = (TypeVar) tree.type;
5422
5423 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5424 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5425 }
5426
5427 if (!typeVar.getUpperBound().isErroneous()) {
5428 //fixup type-parameter bound computed in 'attribTypeVariables'
5429 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5430 }
5431 }
5432
5433 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5434 Set<Symbol> boundSet = new HashSet<>();
5435 if (bounds.nonEmpty()) {
5436 // accept class or interface or typevar as first bound.
5437 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5438 boundSet.add(types.erasure(bounds.head.type).tsym);
5439 if (bounds.head.type.isErroneous()) {
5440 return bounds.head.type;
5441 }
5442 else if (bounds.head.type.hasTag(TYPEVAR)) {
5443 // if first bound was a typevar, do not accept further bounds.
5444 if (bounds.tail.nonEmpty()) {
5445 log.error(bounds.tail.head.pos(),
5446 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5447 return bounds.head.type;
5448 }
5449 } else {
5450 // if first bound was a class or interface, accept only interfaces
5451 // as further bounds.
5452 for (JCExpression bound : bounds.tail) {
5453 bound.type = checkBase(bound.type, bound, env, false, true, false);
5454 if (bound.type.isErroneous()) {
5455 bounds = List.of(bound);
5456 }
5457 else if (bound.type.hasTag(CLASS)) {
5458 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5459 }
5460 }
5461 }
5462 }
5463
5464 if (bounds.length() == 0) {
5465 return syms.objectType;
5466 } else if (bounds.length() == 1) {
5467 return bounds.head.type;
5468 } else {
5469 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5470 // ... the variable's bound is a class type flagged COMPOUND
5471 // (see comment for TypeVar.bound).
5472 // In this case, generate a class tree that represents the
5473 // bound class, ...
5474 JCExpression extending;
5475 List<JCExpression> implementing;
5476 if (!bounds.head.type.isInterface()) {
5477 extending = bounds.head;
5478 implementing = bounds.tail;
5479 } else {
5480 extending = null;
5481 implementing = bounds;
5482 }
5483 JCClassDecl cd = make.at(tree).ClassDef(
5484 make.Modifiers(PUBLIC | ABSTRACT),
5485 names.empty, List.nil(),
5486 extending, implementing, List.nil());
5487
5488 ClassSymbol c = (ClassSymbol)owntype.tsym;
5489 Assert.check((c.flags() & COMPOUND) != 0);
5490 cd.sym = c;
5491 c.sourcefile = env.toplevel.sourcefile;
5492
5493 // ... and attribute the bound class
5494 c.flags_field |= UNATTRIBUTED;
5495 Env<AttrContext> cenv = enter.classEnv(cd, env);
5496 typeEnvs.put(c, cenv);
5497 attribClass(c);
5498 return owntype;
5499 }
5500 }
5501
5502 public void visitWildcard(JCWildcard tree) {
5503 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5504 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5505 ? syms.objectType
5506 : attribType(tree.inner, env);
5507 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5508 tree.kind.kind,
5509 syms.boundClass),
5510 KindSelector.TYP, resultInfo);
5511 }
5512
5513 public void visitAnnotation(JCAnnotation tree) {
5514 Assert.error("should be handled in annotate");
5515 }
5516
5517 @Override
5518 public void visitModifiers(JCModifiers tree) {
5519 //error recovery only:
5520 Assert.check(resultInfo.pkind == KindSelector.ERR);
5521
5522 attribAnnotationTypes(tree.annotations, env);
5523 }
5524
5525 public void visitAnnotatedType(JCAnnotatedType tree) {
5526 attribAnnotationTypes(tree.annotations, env);
5527 Type underlyingType = attribType(tree.underlyingType, env);
5528 Type annotatedType = underlyingType.preannotatedType();
5529
5530 if (!env.info.isAnonymousNewClass)
5531 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5532 result = tree.type = annotatedType;
5533 }
5534
5535 public void visitErroneous(JCErroneous tree) {
5536 if (tree.errs != null) {
5537 WriteableScope newScope = env.info.scope;
5538
5539 if (env.tree instanceof JCClassDecl) {
5540 Symbol fakeOwner =
5541 new MethodSymbol(BLOCK, names.empty, null,
5542 env.info.scope.owner);
5543 newScope = newScope.dupUnshared(fakeOwner);
5544 }
5545
5546 Env<AttrContext> errEnv =
5547 env.dup(env.tree,
5548 env.info.dup(newScope));
5549 errEnv.info.returnResult = unknownExprInfo;
5550 for (JCTree err : tree.errs)
5551 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5552 }
5553 result = tree.type = syms.errType;
5554 }
5555
5556 /** Default visitor method for all other trees.
5557 */
5558 public void visitTree(JCTree tree) {
5559 throw new AssertionError();
5560 }
5561
5562 /**
5563 * Attribute an env for either a top level tree or class or module declaration.
5564 */
5565 public void attrib(Env<AttrContext> env) {
5566 switch (env.tree.getTag()) {
5567 case MODULEDEF:
5568 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5569 break;
5570 case PACKAGEDEF:
5571 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5572 break;
5573 default:
5574 attribClass(env.tree.pos(), env.enclClass.sym);
5575 }
5576
5577 annotate.flush();
5578 }
5579
5580 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5581 try {
5582 annotate.flush();
5583 attribPackage(p);
5584 } catch (CompletionFailure ex) {
5585 chk.completionError(pos, ex);
5586 }
5587 }
5588
5589 void attribPackage(PackageSymbol p) {
5590 attribWithLint(p,
5591 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5592 }
5593
5594 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5595 try {
5596 annotate.flush();
5597 attribModule(m);
5598 } catch (CompletionFailure ex) {
5599 chk.completionError(pos, ex);
5600 }
5601 }
5602
5603 void attribModule(ModuleSymbol m) {
5604 attribWithLint(m, env -> attribStat(env.tree, env));
5605 }
5606
5607 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5608 Env<AttrContext> env = typeEnvs.get(sym);
5609
5610 Env<AttrContext> lintEnv = env;
5611 while (lintEnv.info.lint == null)
5612 lintEnv = lintEnv.next;
5613
5614 Lint lint = lintEnv.info.lint.augment(sym);
5615
5616 Lint prevLint = chk.setLint(lint);
5617 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5618
5619 try {
5620 deferredLintHandler.flush(env.tree, lint);
5621 attrib.accept(env);
5622 } finally {
5623 log.useSource(prev);
5624 chk.setLint(prevLint);
5625 }
5626 }
5627
5628 /** Main method: attribute class definition associated with given class symbol.
5629 * reporting completion failures at the given position.
5630 * @param pos The source position at which completion errors are to be
5631 * reported.
5632 * @param c The class symbol whose definition will be attributed.
5633 */
5634 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5635 try {
5636 annotate.flush();
5637 attribClass(c);
5638 } catch (CompletionFailure ex) {
5639 chk.completionError(pos, ex);
5640 }
5641 }
5642
5643 /** Attribute class definition associated with given class symbol.
5644 * @param c The class symbol whose definition will be attributed.
5645 */
5646 void attribClass(ClassSymbol c) throws CompletionFailure {
5647 if (c.type.hasTag(ERROR)) return;
5648
5649 // Check for cycles in the inheritance graph, which can arise from
5650 // ill-formed class files.
5651 chk.checkNonCyclic(null, c.type);
5652
5653 Type st = types.supertype(c.type);
5654 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5655 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5656 // First, attribute superclass.
5657 if (st.hasTag(CLASS))
5658 attribClass((ClassSymbol)st.tsym);
5659
5660 // Next attribute owner, if it is a class.
5661 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5662 attribClass((ClassSymbol)c.owner);
5663
5664 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5665 }
5666
5667 // The previous operations might have attributed the current class
5668 // if there was a cycle. So we test first whether the class is still
5669 // UNATTRIBUTED.
5670 if ((c.flags_field & UNATTRIBUTED) != 0) {
5671 c.flags_field &= ~UNATTRIBUTED;
5672
5673 // Get environment current at the point of class definition.
5674 Env<AttrContext> env = typeEnvs.get(c);
5675
5676 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5677 // because the annotations were not available at the time the env was created. Therefore,
5678 // we look up the environment chain for the first enclosing environment for which the
5679 // lint value is set. Typically, this is the parent env, but might be further if there
5680 // are any envs created as a result of TypeParameter nodes.
5681 Env<AttrContext> lintEnv = env;
5682 while (lintEnv.info.lint == null)
5683 lintEnv = lintEnv.next;
5684
5685 // Having found the enclosing lint value, we can initialize the lint value for this class
5686 env.info.lint = lintEnv.info.lint.augment(c);
5687
5688 Lint prevLint = chk.setLint(env.info.lint);
5689 JavaFileObject prev = log.useSource(c.sourcefile);
5690 ResultInfo prevReturnRes = env.info.returnResult;
5691
5692 try {
5693 if (c.isSealed() &&
5694 !c.isEnum() &&
5695 !c.isPermittedExplicit &&
5696 c.getPermittedSubclasses().isEmpty()) {
5697 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5698 }
5699
5700 if (c.isSealed()) {
5701 Set<Symbol> permittedTypes = new HashSet<>();
5702 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5703 for (Type subType : c.getPermittedSubclasses()) {
5704 if (subType.isErroneous()) {
5705 // the type already caused errors, don't produce more potentially misleading errors
5706 continue;
5707 }
5708 boolean isTypeVar = false;
5709 if (subType.getTag() == TYPEVAR) {
5710 isTypeVar = true; //error recovery
5711 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5712 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5713 }
5714 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5715 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5716 }
5717 if (permittedTypes.contains(subType.tsym)) {
5718 DiagnosticPosition pos =
5719 env.enclClass.permitting.stream()
5720 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5721 .limit(2).collect(List.collector()).get(1);
5722 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5723 } else {
5724 permittedTypes.add(subType.tsym);
5725 }
5726 if (sealedInUnnamed) {
5727 if (subType.tsym.packge() != c.packge()) {
5728 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5729 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5730 );
5731 }
5732 } else if (subType.tsym.packge().modle != c.packge().modle) {
5733 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5734 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5735 );
5736 }
5737 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5738 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5739 Errors.InvalidPermitsClause(
5740 subType.tsym == c.type.tsym ?
5741 Fragments.MustNotBeSameClass :
5742 Fragments.MustNotBeSupertype(subType)
5743 )
5744 );
5745 } else if (!isTypeVar) {
5746 boolean thisIsASuper = types.directSupertypes(subType)
5747 .stream()
5748 .anyMatch(d -> d.tsym == c);
5749 if (!thisIsASuper) {
5750 if(c.isInterface()) {
5751 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5752 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5753 } else {
5754 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5755 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5756 }
5757 }
5758 }
5759 }
5760 }
5761
5762 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5763 .stream()
5764 .filter(s -> s.tsym.isSealed())
5765 .map(s -> (ClassSymbol) s.tsym)
5766 .collect(List.collector());
5767
5768 if (sealedSupers.isEmpty()) {
5769 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5770 boolean hasErrorSuper = false;
5771
5772 hasErrorSuper |= types.directSupertypes(c.type)
5773 .stream()
5774 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5775
5776 ClassType ct = (ClassType) c.type;
5777
5778 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5779
5780 if (!hasErrorSuper) {
5781 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5782 }
5783 }
5784 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5785 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5786 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5787 }
5788
5789 if (!c.type.isCompound()) {
5790 for (ClassSymbol supertypeSym : sealedSupers) {
5791 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5792 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5793 }
5794 }
5795 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5796 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5797 c.isInterface() ?
5798 Errors.NonSealedOrSealedExpected :
5799 Errors.NonSealedSealedOrFinalExpected);
5800 }
5801 }
5802 }
5803
5804 deferredLintHandler.flush(env.tree, env.info.lint);
5805 env.info.returnResult = null;
5806 // java.lang.Enum may not be subclassed by a non-enum
5807 if (st.tsym == syms.enumSym &&
5808 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5809 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5810
5811 // Enums may not be extended by source-level classes
5812 if (st.tsym != null &&
5813 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5814 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5815 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5816 }
5817
5818 if (rs.isSerializable(c.type)) {
5819 env.info.isSerializable = true;
5820 }
5821
5822 if (c.isValueClass()) {
5823 Assert.check(env.tree.hasTag(CLASSDEF));
5824 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5825 }
5826
5827 attribClassBody(env, c);
5828
5829 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5830 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5831 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5832 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5833
5834 if (c.isImplicit()) {
5835 chk.checkHasMain(env.tree.pos(), c);
5836 }
5837 } finally {
5838 env.info.returnResult = prevReturnRes;
5839 log.useSource(prev);
5840 chk.setLint(prevLint);
5841 }
5842
5843 }
5844 }
5845
5846 public void visitImport(JCImport tree) {
5847 // nothing to do
5848 }
5849
5850 public void visitModuleDef(JCModuleDecl tree) {
5851 tree.sym.completeUsesProvides();
5852 ModuleSymbol msym = tree.sym;
5853 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5854 Lint prevLint = chk.setLint(lint);
5855 chk.checkModuleName(tree);
5856 chk.checkDeprecatedAnnotation(tree, msym);
5857
5858 try {
5859 deferredLintHandler.flush(tree, lint);
5860 } finally {
5861 chk.setLint(prevLint);
5862 }
5863 }
5864
5865 /** Finish the attribution of a class. */
5866 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5867 JCClassDecl tree = (JCClassDecl)env.tree;
5868 Assert.check(c == tree.sym);
5869
5870 // Validate type parameters, supertype and interfaces.
5871 attribStats(tree.typarams, env);
5872 if (!c.isAnonymous()) {
5873 //already checked if anonymous
5874 chk.validate(tree.typarams, env);
5875 chk.validate(tree.extending, env);
5876 chk.validate(tree.implementing, env);
5877 }
5878
5879 chk.checkRequiresIdentity(tree, env.info.lint);
5880
5881 c.markAbstractIfNeeded(types);
5882
5883 // If this is a non-abstract class, check that it has no abstract
5884 // methods or unimplemented methods of an implemented interface.
5885 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5886 chk.checkAllDefined(tree.pos(), c);
5887 }
5888
5889 if ((c.flags() & ANNOTATION) != 0) {
5890 if (tree.implementing.nonEmpty())
5891 log.error(tree.implementing.head.pos(),
5892 Errors.CantExtendIntfAnnotation);
5893 if (tree.typarams.nonEmpty()) {
5894 log.error(tree.typarams.head.pos(),
5895 Errors.IntfAnnotationCantHaveTypeParams(c));
5896 }
5897
5898 // If this annotation type has a @Repeatable, validate
5899 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5900 // If this annotation type has a @Repeatable, validate
5901 if (repeatable != null) {
5902 // get diagnostic position for error reporting
5903 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5904 Assert.checkNonNull(cbPos);
5905
5906 chk.validateRepeatable(c, repeatable, cbPos);
5907 }
5908 } else {
5909 // Check that all extended classes and interfaces
5910 // are compatible (i.e. no two define methods with same arguments
5911 // yet different return types). (JLS 8.4.8.3)
5912 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5913 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5914 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5915 }
5916
5917 // Check that class does not import the same parameterized interface
5918 // with two different argument lists.
5919 chk.checkClassBounds(tree.pos(), c.type);
5920
5921 tree.type = c.type;
5922
5923 for (List<JCTypeParameter> l = tree.typarams;
5924 l.nonEmpty(); l = l.tail) {
5925 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5926 }
5927
5928 // Check that a generic class doesn't extend Throwable
5929 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5930 log.error(tree.extending.pos(), Errors.GenericThrowable);
5931
5932 // Check that all methods which implement some
5933 // method conform to the method they implement.
5934 chk.checkImplementations(tree);
5935
5936 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5937 checkAutoCloseable(tree.pos(), env, c.type);
5938
5939 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5940 // Attribute declaration
5941 attribStat(l.head, env);
5942 // Check that declarations in inner classes are not static (JLS 8.1.2)
5943 // Make an exception for static constants.
5944 if (!allowRecords &&
5945 c.owner.kind != PCK &&
5946 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5947 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5948 VarSymbol sym = null;
5949 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5950 if (sym == null ||
5951 sym.kind != VAR ||
5952 sym.getConstValue() == null)
5953 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5954 }
5955 }
5956
5957 // Check for proper placement of super()/this() calls.
5958 chk.checkSuperInitCalls(tree);
5959
5960 // Check for cycles among non-initial constructors.
5961 chk.checkCyclicConstructors(tree);
5962
5963 // Check for cycles among annotation elements.
5964 chk.checkNonCyclicElements(tree);
5965
5966 // Check for proper use of serialVersionUID and other
5967 // serialization-related fields and methods
5968 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5969 && rs.isSerializable(c.type)
5970 && !c.isAnonymous()) {
5971 chk.checkSerialStructure(env, tree, c);
5972 }
5973 // Correctly organize the positions of the type annotations
5974 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5975
5976 // Check type annotations applicability rules
5977 validateTypeAnnotations(tree, false);
5978 }
5979 // where
5980 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5981 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5982 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5983 if (types.isSameType(al.head.annotationType.type, t))
5984 return al.head.pos();
5985 }
5986
5987 return null;
5988 }
5989
5990 private Type capture(Type type) {
5991 return types.capture(type);
5992 }
5993
5994 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5995 if (type.isErroneous()) {
5996 tree.vartype = make.at(tree.pos()).Erroneous();
5997 } else {
5998 tree.vartype = make.at(tree.pos()).Type(type);
5999 }
6000 }
6001
6002 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
6003 tree.accept(new TypeAnnotationsValidator(sigOnly));
6004 }
6005 //where
6006 private final class TypeAnnotationsValidator extends TreeScanner {
6007
6008 private final boolean sigOnly;
6009 public TypeAnnotationsValidator(boolean sigOnly) {
6010 this.sigOnly = sigOnly;
6011 }
6012
6013 public void visitAnnotation(JCAnnotation tree) {
6014 chk.validateTypeAnnotation(tree, null, false);
6015 super.visitAnnotation(tree);
6016 }
6017 public void visitAnnotatedType(JCAnnotatedType tree) {
6018 if (!tree.underlyingType.type.isErroneous()) {
6019 super.visitAnnotatedType(tree);
6020 }
6021 }
6022 public void visitTypeParameter(JCTypeParameter tree) {
6023 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
6024 scan(tree.bounds);
6025 // Don't call super.
6026 // This is needed because above we call validateTypeAnnotation with
6027 // false, which would forbid annotations on type parameters.
6028 // super.visitTypeParameter(tree);
6029 }
6030 public void visitMethodDef(JCMethodDecl tree) {
6031 if (tree.recvparam != null &&
6032 !tree.recvparam.vartype.type.isErroneous()) {
6033 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
6034 }
6035 if (tree.restype != null && tree.restype.type != null) {
6036 validateAnnotatedType(tree.restype, tree.restype.type);
6037 }
6038 if (sigOnly) {
6039 scan(tree.mods);
6040 scan(tree.restype);
6041 scan(tree.typarams);
6042 scan(tree.recvparam);
6043 scan(tree.params);
6044 scan(tree.thrown);
6045 } else {
6046 scan(tree.defaultValue);
6047 scan(tree.body);
6048 }
6049 }
6050 public void visitVarDef(final JCVariableDecl tree) {
6051 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
6052 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
6053 validateAnnotatedType(tree.vartype, tree.sym.type);
6054 scan(tree.mods);
6055 scan(tree.vartype);
6056 if (!sigOnly) {
6057 scan(tree.init);
6058 }
6059 }
6060 public void visitTypeCast(JCTypeCast tree) {
6061 if (tree.clazz != null && tree.clazz.type != null)
6062 validateAnnotatedType(tree.clazz, tree.clazz.type);
6063 super.visitTypeCast(tree);
6064 }
6065 public void visitTypeTest(JCInstanceOf tree) {
6066 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
6067 validateAnnotatedType(tree.pattern, tree.pattern.type);
6068 super.visitTypeTest(tree);
6069 }
6070 public void visitNewClass(JCNewClass tree) {
6071 if (tree.clazz != null && tree.clazz.type != null) {
6072 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
6073 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
6074 tree.clazz.type.tsym);
6075 }
6076 if (tree.def != null) {
6077 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
6078 }
6079
6080 validateAnnotatedType(tree.clazz, tree.clazz.type);
6081 }
6082 super.visitNewClass(tree);
6083 }
6084 public void visitNewArray(JCNewArray tree) {
6085 if (tree.elemtype != null && tree.elemtype.type != null) {
6086 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
6087 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
6088 tree.elemtype.type.tsym);
6089 }
6090 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
6091 }
6092 super.visitNewArray(tree);
6093 }
6094 public void visitClassDef(JCClassDecl tree) {
6095 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
6096 if (sigOnly) {
6097 scan(tree.mods);
6098 scan(tree.typarams);
6099 scan(tree.extending);
6100 scan(tree.implementing);
6101 }
6102 for (JCTree member : tree.defs) {
6103 if (member.hasTag(Tag.CLASSDEF)) {
6104 continue;
6105 }
6106 scan(member);
6107 }
6108 }
6109 public void visitBlock(JCBlock tree) {
6110 if (!sigOnly) {
6111 scan(tree.stats);
6112 }
6113 }
6114
6115 /* I would want to model this after
6116 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
6117 * and override visitSelect and visitTypeApply.
6118 * However, we only set the annotated type in the top-level type
6119 * of the symbol.
6120 * Therefore, we need to override each individual location where a type
6121 * can occur.
6122 */
6123 private void validateAnnotatedType(final JCTree errtree, final Type type) {
6124 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
6125
6126 if (type.isPrimitiveOrVoid()) {
6127 return;
6128 }
6129
6130 JCTree enclTr = errtree;
6131 Type enclTy = type;
6132
6133 boolean repeat = true;
6134 while (repeat) {
6135 if (enclTr.hasTag(TYPEAPPLY)) {
6136 List<Type> tyargs = enclTy.getTypeArguments();
6137 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
6138 if (trargs.length() > 0) {
6139 // Nothing to do for diamonds
6140 if (tyargs.length() == trargs.length()) {
6141 for (int i = 0; i < tyargs.length(); ++i) {
6142 validateAnnotatedType(trargs.get(i), tyargs.get(i));
6143 }
6144 }
6145 // If the lengths don't match, it's either a diamond
6146 // or some nested type that redundantly provides
6147 // type arguments in the tree.
6148 }
6149
6150 // Look at the clazz part of a generic type
6151 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
6152 }
6153
6154 if (enclTr.hasTag(SELECT)) {
6155 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
6156 if (enclTy != null &&
6157 !enclTy.hasTag(NONE)) {
6158 enclTy = enclTy.getEnclosingType();
6159 }
6160 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
6161 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
6162 if (enclTy == null || enclTy.hasTag(NONE)) {
6163 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
6164 for (JCAnnotation an : at.getAnnotations()) {
6165 if (chk.isTypeAnnotation(an, false)) {
6166 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
6167 }
6168 }
6169 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
6170 if (!onlyTypeAnnotations.isEmpty()) {
6171 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
6172 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
6173 Fragments.TypeAnnotation(onlyTypeAnnotations);
6174 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
6175 type.stripMetadata().annotatedType(onlyTypeAnnotations));
6176 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
6177 type.tsym.owner, annotatedType));
6178 }
6179 repeat = false;
6180 }
6181 enclTr = at.underlyingType;
6182 // enclTy doesn't need to be changed
6183 } else if (enclTr.hasTag(IDENT)) {
6184 repeat = false;
6185 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6186 JCWildcard wc = (JCWildcard) enclTr;
6187 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6188 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6189 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6190 } else {
6191 // Nothing to do for UNBOUND
6192 }
6193 repeat = false;
6194 } else if (enclTr.hasTag(TYPEARRAY)) {
6195 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6196 validateAnnotatedType(art.getType(), art.elemtype.type);
6197 repeat = false;
6198 } else if (enclTr.hasTag(TYPEUNION)) {
6199 JCTypeUnion ut = (JCTypeUnion) enclTr;
6200 for (JCTree t : ut.getTypeAlternatives()) {
6201 validateAnnotatedType(t, t.type);
6202 }
6203 repeat = false;
6204 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6205 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6206 for (JCTree t : it.getBounds()) {
6207 validateAnnotatedType(t, t.type);
6208 }
6209 repeat = false;
6210 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6211 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6212 repeat = false;
6213 } else {
6214 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6215 " within: "+ errtree + " with kind: " + errtree.getKind());
6216 }
6217 }
6218 }
6219
6220 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6221 Symbol sym) {
6222 // Ensure that no declaration annotations are present.
6223 // Note that a tree type might be an AnnotatedType with
6224 // empty annotations, if only declaration annotations were given.
6225 // This method will raise an error for such a type.
6226 for (JCAnnotation ai : annotations) {
6227 if (!ai.type.isErroneous() &&
6228 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6229 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6230 }
6231 }
6232 }
6233 }
6234
6235 // <editor-fold desc="post-attribution visitor">
6236
6237 /**
6238 * Handle missing types/symbols in an AST. This routine is useful when
6239 * the compiler has encountered some errors (which might have ended up
6240 * terminating attribution abruptly); if the compiler is used in fail-over
6241 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6242 * prevents NPE to be propagated during subsequent compilation steps.
6243 */
6244 public void postAttr(JCTree tree) {
6245 new PostAttrAnalyzer().scan(tree);
6246 }
6247
6248 class PostAttrAnalyzer extends TreeScanner {
6249
6250 private void initTypeIfNeeded(JCTree that) {
6251 if (that.type == null) {
6252 if (that.hasTag(METHODDEF)) {
6253 that.type = dummyMethodType((JCMethodDecl)that);
6254 } else {
6255 that.type = syms.unknownType;
6256 }
6257 }
6258 }
6259
6260 /* Construct a dummy method type. If we have a method declaration,
6261 * and the declared return type is void, then use that return type
6262 * instead of UNKNOWN to avoid spurious error messages in lambda
6263 * bodies (see:JDK-8041704).
6264 */
6265 private Type dummyMethodType(JCMethodDecl md) {
6266 Type restype = syms.unknownType;
6267 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6268 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6269 if (prim.typetag == VOID)
6270 restype = syms.voidType;
6271 }
6272 return new MethodType(List.nil(), restype,
6273 List.nil(), syms.methodClass);
6274 }
6275 private Type dummyMethodType() {
6276 return dummyMethodType(null);
6277 }
6278
6279 @Override
6280 public void scan(JCTree tree) {
6281 if (tree == null) return;
6282 if (tree instanceof JCExpression) {
6283 initTypeIfNeeded(tree);
6284 }
6285 super.scan(tree);
6286 }
6287
6288 @Override
6289 public void visitIdent(JCIdent that) {
6290 if (that.sym == null) {
6291 that.sym = syms.unknownSymbol;
6292 }
6293 }
6294
6295 @Override
6296 public void visitSelect(JCFieldAccess that) {
6297 if (that.sym == null) {
6298 that.sym = syms.unknownSymbol;
6299 }
6300 super.visitSelect(that);
6301 }
6302
6303 @Override
6304 public void visitClassDef(JCClassDecl that) {
6305 initTypeIfNeeded(that);
6306 if (that.sym == null) {
6307 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6308 }
6309 super.visitClassDef(that);
6310 }
6311
6312 @Override
6313 public void visitMethodDef(JCMethodDecl that) {
6314 initTypeIfNeeded(that);
6315 if (that.sym == null) {
6316 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6317 }
6318 super.visitMethodDef(that);
6319 }
6320
6321 @Override
6322 public void visitVarDef(JCVariableDecl that) {
6323 initTypeIfNeeded(that);
6324 if (that.sym == null) {
6325 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6326 that.sym.adr = 0;
6327 }
6328 if (that.vartype == null) {
6329 that.vartype = make.at(Position.NOPOS).Erroneous();
6330 }
6331 super.visitVarDef(that);
6332 }
6333
6334 @Override
6335 public void visitBindingPattern(JCBindingPattern that) {
6336 initTypeIfNeeded(that);
6337 initTypeIfNeeded(that.var);
6338 if (that.var.sym == null) {
6339 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6340 that.var.sym.adr = 0;
6341 }
6342 super.visitBindingPattern(that);
6343 }
6344
6345 @Override
6346 public void visitRecordPattern(JCRecordPattern that) {
6347 initTypeIfNeeded(that);
6348 if (that.record == null) {
6349 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6350 that.type, syms.noSymbol);
6351 }
6352 if (that.fullComponentTypes == null) {
6353 that.fullComponentTypes = List.nil();
6354 }
6355 super.visitRecordPattern(that);
6356 }
6357
6358 @Override
6359 public void visitNewClass(JCNewClass that) {
6360 if (that.constructor == null) {
6361 that.constructor = new MethodSymbol(0, names.init,
6362 dummyMethodType(), syms.noSymbol);
6363 }
6364 if (that.constructorType == null) {
6365 that.constructorType = syms.unknownType;
6366 }
6367 super.visitNewClass(that);
6368 }
6369
6370 @Override
6371 public void visitAssignop(JCAssignOp that) {
6372 if (that.operator == null) {
6373 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6374 -1, syms.noSymbol);
6375 }
6376 super.visitAssignop(that);
6377 }
6378
6379 @Override
6380 public void visitBinary(JCBinary that) {
6381 if (that.operator == null) {
6382 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6383 -1, syms.noSymbol);
6384 }
6385 super.visitBinary(that);
6386 }
6387
6388 @Override
6389 public void visitUnary(JCUnary that) {
6390 if (that.operator == null) {
6391 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6392 -1, syms.noSymbol);
6393 }
6394 super.visitUnary(that);
6395 }
6396
6397 @Override
6398 public void visitReference(JCMemberReference that) {
6399 super.visitReference(that);
6400 if (that.sym == null) {
6401 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6402 syms.noSymbol);
6403 }
6404 }
6405 }
6406 // </editor-fold>
6407
6408 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6409 new TreeScanner() {
6410 Symbol packge = pkg;
6411 @Override
6412 public void visitIdent(JCIdent that) {
6413 that.sym = packge;
6414 }
6415
6416 @Override
6417 public void visitSelect(JCFieldAccess that) {
6418 that.sym = packge;
6419 packge = packge.owner;
6420 super.visitSelect(that);
6421 }
6422 }.scan(pid);
6423 }
6424
6425 }
--- EOF ---