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.LintMapper;
45 import com.sun.tools.javac.code.Scope.WriteableScope;
46 import com.sun.tools.javac.code.Source.Feature;
47 import com.sun.tools.javac.code.Symbol.*;
48 import com.sun.tools.javac.code.Type.*;
49 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
50 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
51 import com.sun.tools.javac.comp.Check.CheckContext;
52 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
53 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
54 import com.sun.tools.javac.jvm.*;
55
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
59
60 import com.sun.tools.javac.resources.CompilerProperties.Errors;
61 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
62 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
63 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
64 import com.sun.tools.javac.tree.*;
65 import com.sun.tools.javac.tree.JCTree.*;
66 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
67 import com.sun.tools.javac.util.*;
68 import com.sun.tools.javac.util.DefinedBy.Api;
69 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
70 import com.sun.tools.javac.util.JCDiagnostic.Error;
71 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
72 import com.sun.tools.javac.util.JCDiagnostic.Warning;
73 import com.sun.tools.javac.util.List;
74
75 import static com.sun.tools.javac.code.Flags.*;
76 import static com.sun.tools.javac.code.Flags.ANNOTATION;
77 import static com.sun.tools.javac.code.Flags.BLOCK;
78 import static com.sun.tools.javac.code.Kinds.*;
79 import static com.sun.tools.javac.code.Kinds.Kind.*;
80 import static com.sun.tools.javac.code.TypeTag.*;
81 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
82 import static com.sun.tools.javac.tree.JCTree.Tag.*;
83
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 LintMapper lintMapper;
103 final Symtab syms;
104 final Resolve rs;
105 final Operators operators;
106 final Infer infer;
107 final Analyzer analyzer;
108 final DeferredAttr deferredAttr;
109 final Check chk;
110 final Flow flow;
111 final MemberEnter memberEnter;
112 final TypeEnter typeEnter;
113 final TreeMaker make;
114 final ConstFold cfolder;
115 final Enter enter;
116 final Target target;
117 final Types types;
118 final Preview preview;
119 final JCDiagnostic.Factory diags;
120 final TypeAnnotations typeAnnotations;
121 final 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 lintMapper = LintMapper.instance(context);
143 syms = Symtab.instance(context);
144 rs = Resolve.instance(context);
145 operators = Operators.instance(context);
146 chk = Check.instance(context);
147 flow = Flow.instance(context);
148 memberEnter = MemberEnter.instance(context);
149 typeEnter = TypeEnter.instance(context);
150 make = TreeMaker.instance(context);
151 enter = Enter.instance(context);
152 infer = Infer.instance(context);
153 analyzer = Analyzer.instance(context);
154 deferredAttr = DeferredAttr.instance(context);
155 cfolder = ConstFold.instance(context);
156 target = Target.instance(context);
157 types = Types.instance(context);
158 preview = Preview.instance(context);
159 diags = JCDiagnostic.Factory.instance(context);
160 annotate = Annotate.instance(context);
161 typeAnnotations = TypeAnnotations.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 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
847 try {
848 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
849 Type itype = attribExpr(variable.init, env, type);
850 if (variable.isImplicitlyTyped()) {
851 //fixup local variable type
852 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
853 }
854 if (itype.constValue() != null) {
855 return coerce(itype, type).constValue();
856 } else {
857 return null;
858 }
859 } finally {
860 log.useSource(prevSource);
861 }
862 }
863
864 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
865 * Supertypes of anonymous inner classes are usually already attributed.
866 *
867 * @param tree The tree making up the type reference.
868 * @param env The environment current at the reference.
869 * @param classExpected true if only a class is expected here.
870 * @param interfaceExpected true if only an interface is expected here.
871 */
872 Type attribBase(JCTree tree,
873 Env<AttrContext> env,
874 boolean classExpected,
875 boolean interfaceExpected,
876 boolean checkExtensible) {
877 Type t = tree.type != null ?
878 tree.type :
879 attribType(tree, env);
880 try {
881 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
882 } catch (CompletionFailure ex) {
883 chk.completionError(tree.pos(), ex);
884 return t;
885 }
886 }
887 Type checkBase(Type t,
888 JCTree tree,
889 Env<AttrContext> env,
890 boolean classExpected,
891 boolean interfaceExpected,
892 boolean checkExtensible) {
893 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
894 (((JCTypeApply) tree).clazz).pos() : tree.pos();
895 if (t.tsym.isAnonymous()) {
896 log.error(pos, Errors.CantInheritFromAnon);
897 return types.createErrorType(t);
898 }
899 if (t.isErroneous())
900 return t;
901 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
902 // check that type variable is already visible
903 if (t.getUpperBound() == null) {
904 log.error(pos, Errors.IllegalForwardRef);
905 return types.createErrorType(t);
906 }
907 } else {
908 t = chk.checkClassType(pos, t, checkExtensible);
909 }
910 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
911 log.error(pos, Errors.IntfExpectedHere);
912 // return errType is necessary since otherwise there might
913 // be undetected cycles which cause attribution to loop
914 return types.createErrorType(t);
915 } else if (checkExtensible &&
916 classExpected &&
917 (t.tsym.flags() & INTERFACE) != 0) {
918 log.error(pos, Errors.NoIntfExpectedHere);
919 return types.createErrorType(t);
920 }
921 if (checkExtensible &&
922 ((t.tsym.flags() & FINAL) != 0)) {
923 log.error(pos,
924 Errors.CantInheritFromFinal(t.tsym));
925 }
926 chk.checkNonCyclic(pos, t);
927 return t;
928 }
929
930 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
931 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
932 id.type = env.info.scope.owner.enclClass().type;
933 id.sym = env.info.scope.owner.enclClass();
934 return id.type;
935 }
936
937 public void visitClassDef(JCClassDecl tree) {
938 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
939 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
940 argumentAttr.withLocalCacheContext() : null);
941 boolean ctorProloguePrev = env.info.ctorPrologue;
942 try {
943 // Local and anonymous classes have not been entered yet, so we need to
944 // do it now.
945 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
946 enter.classEnter(tree, env);
947 } else {
948 // If this class declaration is part of a class level annotation,
949 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
950 // order to simplify later steps and allow for sensible error
951 // messages.
952 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
953 enter.classEnter(tree, env);
954 }
955
956 ClassSymbol c = tree.sym;
957 if (c == null) {
958 // exit in case something drastic went wrong during enter.
959 result = null;
960 } else {
961 // make sure class has been completed:
962 c.complete();
963
964 // If a class declaration appears in a constructor prologue,
965 // that means it's either a local class or an anonymous class.
966 // Either way, there is no immediately enclosing instance.
967 if (ctorProloguePrev) {
968 c.flags_field |= NOOUTERTHIS;
969 }
970 attribClass(tree.pos(), c);
971 result = tree.type = c.type;
972 }
973 } finally {
974 localCacheContext.ifPresent(LocalCacheContext::leave);
975 env.info.ctorPrologue = ctorProloguePrev;
976 }
977 }
978
979 public void visitMethodDef(JCMethodDecl tree) {
980 MethodSymbol m = tree.sym;
981 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
982
983 Lint lint = env.info.lint.augment(m);
984 Lint prevLint = chk.setLint(lint);
985 boolean ctorProloguePrev = env.info.ctorPrologue;
986 Assert.check(!env.info.ctorPrologue);
987 MethodSymbol prevMethod = chk.setMethod(m);
988 try {
989 chk.checkDeprecatedAnnotation(tree.pos(), m);
990
991
992 // Create a new environment with local scope
993 // for attributing the method.
994 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
995 localEnv.info.lint = lint;
996
997 attribStats(tree.typarams, localEnv);
998
999 // If we override any other methods, check that we do so properly.
1000 // JLS ???
1001 if (m.isStatic()) {
1002 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1003 } else {
1004 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1005 }
1006 chk.checkOverride(env, tree, m);
1007
1008 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1009 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1010 }
1011
1012 // Enter all type parameters into the local method scope.
1013 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1014 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1015
1016 ClassSymbol owner = env.enclClass.sym;
1017 if ((owner.flags() & ANNOTATION) != 0 &&
1018 (tree.params.nonEmpty() ||
1019 tree.recvparam != null))
1020 log.error(tree.params.nonEmpty() ?
1021 tree.params.head.pos() :
1022 tree.recvparam.pos(),
1023 Errors.IntfAnnotationMembersCantHaveParams);
1024
1025 // Attribute all value parameters.
1026 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1027 attribStat(l.head, localEnv);
1028 }
1029
1030 chk.checkVarargsMethodDecl(localEnv, tree);
1031
1032 // Check that type parameters are well-formed.
1033 chk.validate(tree.typarams, localEnv);
1034
1035 // Check that result type is well-formed.
1036 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) {
1037 chk.validate(tree.restype, localEnv);
1038 }
1039 chk.checkRequiresIdentity(tree, env.info.lint);
1040
1041 // Check that receiver type is well-formed.
1042 if (tree.recvparam != null) {
1043 // Use a new environment to check the receiver parameter.
1044 // Otherwise I get "might not have been initialized" errors.
1045 // Is there a better way?
1046 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1047 attribType(tree.recvparam, newEnv);
1048 chk.validate(tree.recvparam, newEnv);
1049 }
1050
1051 // Is this method a constructor?
1052 boolean isConstructor = TreeInfo.isConstructor(tree);
1053
1054 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1055 // lets find if this method is an accessor
1056 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1057 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1058 if (recordComponent.isPresent()) {
1059 // the method is a user defined accessor lets check that everything is fine
1060 if (!tree.sym.isPublic()) {
1061 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1062 }
1063 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1064 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1065 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1066 }
1067 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1068 log.error(tree,
1069 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1070 }
1071 if (!tree.typarams.isEmpty()) {
1072 log.error(tree,
1073 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1074 }
1075 if (tree.sym.isStatic()) {
1076 log.error(tree,
1077 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1078 }
1079 }
1080
1081 if (isConstructor) {
1082 // if this a constructor other than the canonical one
1083 if ((tree.sym.flags_field & RECORD) == 0) {
1084 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1085 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1086 }
1087 } else {
1088 // but if it is the canonical:
1089
1090 /* if user generated, then it shouldn't:
1091 * - have an accessibility stricter than that of the record type
1092 * - explicitly invoke any other constructor
1093 */
1094 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1095 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1096 log.error(tree,
1097 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1098 Errors.InvalidCanonicalConstructorInRecord(
1099 Fragments.Canonical,
1100 env.enclClass.sym.name,
1101 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1102 ) :
1103 Errors.InvalidCanonicalConstructorInRecord(
1104 Fragments.Canonical,
1105 env.enclClass.sym.name,
1106 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1107 )
1108 );
1109 }
1110
1111 if (!allowValueClasses && TreeInfo.hasAnyConstructorCall(tree)) {
1112 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1113 Fragments.Canonical, env.enclClass.sym.name,
1114 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1115 }
1116 }
1117
1118 // also we want to check that no type variables have been defined
1119 if (!tree.typarams.isEmpty()) {
1120 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1121 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1122 }
1123
1124 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1125 * record components
1126 */
1127 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1128 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1129 for (JCVariableDecl param: tree.params) {
1130 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1131 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1132 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1133 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1134 Fragments.Canonical, env.enclClass.sym.name,
1135 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1136 }
1137 recordComponents = recordComponents.tail;
1138 recordFieldTypes = recordFieldTypes.tail;
1139 }
1140 }
1141 }
1142 }
1143
1144 // annotation method checks
1145 if ((owner.flags() & ANNOTATION) != 0) {
1146 // annotation method cannot have throws clause
1147 if (tree.thrown.nonEmpty()) {
1148 log.error(tree.thrown.head.pos(),
1149 Errors.ThrowsNotAllowedInIntfAnnotation);
1150 }
1151 // annotation method cannot declare type-parameters
1152 if (tree.typarams.nonEmpty()) {
1153 log.error(tree.typarams.head.pos(),
1154 Errors.IntfAnnotationMembersCantHaveTypeParams);
1155 }
1156 // validate annotation method's return type (could be an annotation type)
1157 chk.validateAnnotationType(tree.restype);
1158 // ensure that annotation method does not clash with members of Object/Annotation
1159 chk.validateAnnotationMethod(tree.pos(), m);
1160 }
1161
1162 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1163 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1164
1165 if (tree.body == null) {
1166 // Empty bodies are only allowed for
1167 // abstract, native, or interface methods, or for methods
1168 // in a retrofit signature class.
1169 if (tree.defaultValue != null) {
1170 if ((owner.flags() & ANNOTATION) == 0)
1171 log.error(tree.pos(),
1172 Errors.DefaultAllowedInIntfAnnotationMember);
1173 }
1174 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1175 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1176 } else {
1177 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1178 if ((owner.flags() & INTERFACE) != 0) {
1179 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1180 } else {
1181 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1182 }
1183 } else if ((tree.mods.flags & NATIVE) != 0) {
1184 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1185 }
1186 // Add an implicit super() call unless an explicit call to
1187 // super(...) or this(...) is given
1188 // or we are compiling class java.lang.Object.
1189 boolean addedSuperInIdentityClass = false;
1190 if (isConstructor && owner.type != syms.objectType) {
1191 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1192 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1193 make.Ident(names._super), make.Idents(List.nil())));
1194 if (allowValueClasses && (owner.isValueClass() || owner.hasStrict() || ((owner.flags_field & RECORD) != 0))) {
1195 tree.body.stats = tree.body.stats.append(supCall);
1196 } else {
1197 tree.body.stats = tree.body.stats.prepend(supCall);
1198 addedSuperInIdentityClass = true;
1199 }
1200 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1201 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1202 TreeInfo.hasConstructorCall(tree, names._super)) {
1203 // enum constructors are not allowed to call super
1204 // directly, so make sure there aren't any super calls
1205 // in enum constructors, except in the compiler
1206 // generated one.
1207 log.error(tree.body.stats.head.pos(),
1208 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1209 }
1210 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1211 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1212 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1213 if (!initParamNames.equals(recordComponentNames)) {
1214 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1215 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1216 }
1217 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1218 log.error(tree,
1219 Errors.InvalidCanonicalConstructorInRecord(
1220 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1221 env.enclClass.sym.name,
1222 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1223 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1224 }
1225 }
1226 }
1227
1228 // Attribute all type annotations in the body
1229 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1230 annotate.flush();
1231
1232 // Start of constructor prologue (if not in java.lang.Object constructor)
1233 localEnv.info.ctorPrologue = isConstructor && owner.type != syms.objectType;
1234
1235 // Attribute method body.
1236 attribStat(tree.body, localEnv);
1237 if (localEnv.info.ctorPrologue) {
1238 boolean thisInvocation = false;
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 thisInvocation = TreeInfo.name(mi.meth) == names._this;
1250 if (!addedSuperInIdentityClass || !allowValueClasses) {
1251 break;
1252 }
1253 }
1254 }
1255 if (!prologueCode.isEmpty()) {
1256 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(localEnv,
1257 addedSuperInIdentityClass && allowValueClasses ?
1258 PrologueVisitorMode.WARNINGS_ONLY :
1259 thisInvocation ?
1260 PrologueVisitorMode.THIS_CONSTRUCTOR :
1261 PrologueVisitorMode.SUPER_CONSTRUCTOR);
1262 ctorPrologueVisitor.scan(prologueCode.toList());
1263 }
1264 }
1265 }
1266
1267 localEnv.info.scope.leave();
1268 result = tree.type = m.type;
1269 } finally {
1270 chk.setLint(prevLint);
1271 chk.setMethod(prevMethod);
1272 env.info.ctorPrologue = ctorProloguePrev;
1273 }
1274 }
1275
1276 enum PrologueVisitorMode {
1277 WARNINGS_ONLY,
1278 SUPER_CONSTRUCTOR,
1279 THIS_CONSTRUCTOR
1280 }
1281
1282 class CtorPrologueVisitor extends TreeScanner {
1283 Env<AttrContext> localEnv;
1284 PrologueVisitorMode mode;
1285
1286 CtorPrologueVisitor(Env<AttrContext> localEnv, PrologueVisitorMode mode) {
1287 this.localEnv = localEnv;
1288 currentClassSym = localEnv.enclClass.sym;
1289 this.mode = mode;
1290 }
1291
1292 boolean insideLambdaOrClassDef = false;
1293
1294 @Override
1295 public void visitLambda(JCLambda lambda) {
1296 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1297 try {
1298 insideLambdaOrClassDef = true;
1299 super.visitLambda(lambda);
1300 } finally {
1301 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1302 }
1303 }
1304
1305 ClassSymbol currentClassSym;
1306
1307 @Override
1308 public void visitClassDef(JCClassDecl classDecl) {
1309 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1310 ClassSymbol previousClassSym = currentClassSym;
1311 try {
1312 insideLambdaOrClassDef = true;
1313 currentClassSym = classDecl.sym;
1314 super.visitClassDef(classDecl);
1315 } finally {
1316 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1317 currentClassSym = previousClassSym;
1318 }
1319 }
1320
1321 private void reportPrologueError(JCTree tree, Symbol sym) {
1322 reportPrologueError(tree, sym, false);
1323 }
1324
1325 private void reportPrologueError(JCTree tree, Symbol sym, boolean hasInit) {
1326 preview.checkSourceLevel(tree, Feature.FLEXIBLE_CONSTRUCTORS);
1327 if (mode != PrologueVisitorMode.WARNINGS_ONLY) {
1328 if (hasInit) {
1329 log.error(tree, Errors.CantAssignInitializedBeforeCtorCalled(sym));
1330 } else {
1331 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1332 }
1333 } else if (allowValueClasses) {
1334 // issue lint warning
1335 log.warning(tree, LintWarnings.WouldNotBeAllowedInPrologue(sym));
1336 }
1337 }
1338
1339 @Override
1340 public void visitApply(JCMethodInvocation tree) {
1341 super.visitApply(tree);
1342 Name name = TreeInfo.name(tree.meth);
1343 boolean isConstructorCall = name == names._this || name == names._super;
1344 Symbol msym = TreeInfo.symbolFor(tree.meth);
1345 // is this an instance method call or an illegal constructor invocation like: `this.super()`?
1346 if (msym != null && // for erroneous invocations msym can be null, ignore those
1347 (!isConstructorCall ||
1348 isConstructorCall && tree.meth.hasTag(SELECT))) {
1349 if (isEarlyReference(localEnv, tree.meth, msym))
1350 reportPrologueError(tree.meth, msym);
1351 }
1352 }
1353
1354 @Override
1355 public void visitIdent(JCIdent tree) {
1356 analyzeSymbol(tree);
1357 }
1358
1359 @Override
1360 public void visitSelect(JCFieldAccess tree) {
1361 SelectScanner ss = new SelectScanner();
1362 ss.scan(tree);
1363 if (ss.scanLater == null) {
1364 analyzeSymbol(tree);
1365 } else {
1366 boolean prevLhs = isInLHS;
1367 try {
1368 isInLHS = false;
1369 scan(ss.scanLater);
1370 } finally {
1371 isInLHS = prevLhs;
1372 }
1373 }
1374 }
1375
1376 @Override
1377 public void visitNewClass(JCNewClass tree) {
1378 super.visitNewClass(tree);
1379 checkNewClassAndMethRefs(tree, tree.type);
1380 }
1381
1382 @Override
1383 public void visitReference(JCMemberReference tree) {
1384 super.visitReference(tree);
1385 if (tree.getMode() == JCMemberReference.ReferenceMode.NEW) {
1386 checkNewClassAndMethRefs(tree, tree.expr.type);
1387 }
1388 }
1389
1390 void checkNewClassAndMethRefs(JCTree tree, Type t) {
1391 if (t.tsym.isEnclosedBy(localEnv.enclClass.sym) &&
1392 !t.tsym.isStatic() &&
1393 !t.tsym.isDirectlyOrIndirectlyLocal()) {
1394 reportPrologueError(tree, t.getEnclosingType().tsym);
1395 }
1396 }
1397
1398 /* if a symbol is in the LHS of an assignment expression we won't consider it as a candidate
1399 * for a proxy local variable later on
1400 */
1401 boolean isInLHS = false;
1402
1403 @Override
1404 public void visitAssign(JCAssign tree) {
1405 boolean previousIsInLHS = isInLHS;
1406 try {
1407 isInLHS = true;
1408 scan(tree.lhs);
1409 } finally {
1410 isInLHS = previousIsInLHS;
1411 }
1412 scan(tree.rhs);
1413 }
1414
1415 @Override
1416 public void visitMethodDef(JCMethodDecl tree) {
1417 // ignore any declarative part, mainly to avoid scanning receiver parameters
1418 scan(tree.body);
1419 }
1420
1421 void analyzeSymbol(JCTree tree) {
1422 Symbol sym = TreeInfo.symbolFor(tree);
1423 // make sure that there is a symbol and it is not static
1424 if (sym == null || sym.isStatic()) {
1425 return;
1426 }
1427 if (isInLHS && !insideLambdaOrClassDef) {
1428 // Check instance field assignments that appear in constructor prologues
1429 if (isEarlyReference(localEnv, tree, sym)) {
1430 // Field may not be inherited from a superclass
1431 if (sym.owner != localEnv.enclClass.sym) {
1432 reportPrologueError(tree, sym);
1433 return;
1434 }
1435 // Field may not have an initializer
1436 if ((sym.flags() & HASINIT) != 0) {
1437 reportPrologueError(tree, sym, true);
1438 return;
1439 }
1440 // cant reference an instance field before a this constructor
1441 if (allowValueClasses && mode == PrologueVisitorMode.THIS_CONSTRUCTOR) {
1442 reportPrologueError(tree, sym);
1443 return;
1444 }
1445 }
1446 return;
1447 }
1448 tree = TreeInfo.skipParens(tree);
1449 if (sym.kind == VAR && sym.owner.kind == TYP) {
1450 if (sym.name == names._this || sym.name == names._super) {
1451 // are we seeing something like `this` or `CurrentClass.this` or `SuperClass.super::foo`?
1452 if (TreeInfo.isExplicitThisReference(
1453 types,
1454 (ClassType)localEnv.enclClass.sym.type,
1455 tree)) {
1456 reportPrologueError(tree, sym);
1457 }
1458 } else if (sym.kind == VAR && sym.owner.kind == TYP) { // now fields only
1459 if (sym.owner != localEnv.enclClass.sym) {
1460 if (localEnv.enclClass.sym.isSubClass(sym.owner, types) &&
1461 sym.isInheritedIn(localEnv.enclClass.sym, types)) {
1462 /* if we are dealing with a field that doesn't belong to the current class, but the
1463 * field is inherited, this is an error. Unless, the super class is also an outer
1464 * class and the field's qualifier refers to the outer class
1465 */
1466 if (tree.hasTag(IDENT) ||
1467 TreeInfo.isExplicitThisReference(
1468 types,
1469 (ClassType)localEnv.enclClass.sym.type,
1470 ((JCFieldAccess)tree).selected)) {
1471 reportPrologueError(tree, sym);
1472 }
1473 }
1474 } else if (isEarlyReference(localEnv, tree, sym)) {
1475 /* now this is a `proper` instance field of the current class
1476 * references to fields of identity classes which happen to have initializers are
1477 * not allowed in the prologue
1478 */
1479 if (insideLambdaOrClassDef ||
1480 (!localEnv.enclClass.sym.isValueClass() && (sym.flags_field & HASINIT) != 0))
1481 reportPrologueError(tree, sym);
1482 // we will need to generate a proxy for this field later on
1483 if (!isInLHS) {
1484 if (!allowValueClasses) {
1485 reportPrologueError(tree, sym);
1486 } else {
1487 if (mode == PrologueVisitorMode.THIS_CONSTRUCTOR) {
1488 reportPrologueError(tree, sym);
1489 } else if (mode == PrologueVisitorMode.SUPER_CONSTRUCTOR) {
1490 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, sym);
1491 }
1492 /* we do nothing in warnings only mode, as in that mode we are simulating what
1493 * the compiler would do in case the constructor code would be in the prologue
1494 * phase
1495 */
1496 }
1497 }
1498 }
1499 }
1500 }
1501 }
1502
1503 /**
1504 * Determine if the symbol appearance constitutes an early reference to the current class.
1505 *
1506 * <p>
1507 * This means the symbol is an instance field, or method, of the current class and it appears
1508 * in an early initialization context of it (i.e., one of its constructor prologues).
1509 *
1510 * @param env The current environment
1511 * @param tree the AST referencing the variable
1512 * @param sym The symbol
1513 */
1514 private boolean isEarlyReference(Env<AttrContext> env, JCTree tree, Symbol sym) {
1515 if ((sym.flags() & STATIC) == 0 &&
1516 (sym.kind == VAR || sym.kind == MTH) &&
1517 sym.isMemberOf(env.enclClass.sym, types)) {
1518 // Allow "Foo.this.x" when "Foo" is (also) an outer class, as this refers to the outer instance
1519 if (tree instanceof JCFieldAccess fa) {
1520 return TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, fa.selected);
1521 } else if (currentClassSym != env.enclClass.sym) {
1522 /* so we are inside a class, CI, in the prologue of an outer class, CO, and the symbol being
1523 * analyzed has no qualifier. So if the symbol is a member of CI the reference is allowed,
1524 * otherwise it is not.
1525 * It could be that the reference to CI's member happens inside CI's own prologue, but that
1526 * will be checked separately, when CI's prologue is analyzed.
1527 */
1528 return !sym.isMemberOf(currentClassSym, types);
1529 }
1530 return true;
1531 }
1532 return false;
1533 }
1534
1535 /* scanner for a select expression, anything that is not a select or identifier
1536 * will be stored for further analysis
1537 */
1538 class SelectScanner extends DeferredAttr.FilterScanner {
1539 JCTree scanLater;
1540
1541 SelectScanner() {
1542 super(Set.of(IDENT, SELECT, PARENS));
1543 }
1544
1545 @Override
1546 void skip(JCTree tree) {
1547 scanLater = tree;
1548 }
1549 }
1550 }
1551
1552 public void visitVarDef(JCVariableDecl tree) {
1553 // Local variables have not been entered yet, so we need to do it now:
1554 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1555 if (tree.sym != null) {
1556 // parameters have already been entered
1557 env.info.scope.enter(tree.sym);
1558 } else {
1559 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1560 if (tree.init == null) {
1561 //cannot use 'var' without initializer
1562 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1563 tree.vartype = make.Erroneous();
1564 } else {
1565 Fragment msg = canInferLocalVarType(tree);
1566 if (msg != null) {
1567 //cannot use 'var' with initializer which require an explicit target
1568 //(e.g. lambda, method reference, array initializer).
1569 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1570 tree.vartype = make.Erroneous();
1571 }
1572 }
1573 }
1574 try {
1575 annotate.blockAnnotations();
1576 memberEnter.memberEnter(tree, env);
1577 } finally {
1578 annotate.unblockAnnotations();
1579 }
1580 }
1581 } else {
1582 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1583 }
1584
1585 VarSymbol v = tree.sym;
1586 Lint lint = env.info.lint.augment(v);
1587 Lint prevLint = chk.setLint(lint);
1588
1589 // Check that the variable's declared type is well-formed.
1590 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1591 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1592 (tree.sym.flags() & PARAMETER) != 0;
1593 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1594
1595 try {
1596 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1597 chk.checkDeprecatedAnnotation(tree.pos(), v);
1598
1599 if (tree.init != null) {
1600 if ((v.flags_field & FINAL) == 0 ||
1601 !memberEnter.needsLazyConstValue(tree.init)) {
1602 // Not a compile-time constant
1603 // Attribute initializer in a new environment
1604 // with the declared variable as owner.
1605 // Check that initializer conforms to variable's declared type.
1606 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1607 initEnv.info.lint = lint;
1608 // In order to catch self-references, we set the variable's
1609 // declaration position to maximal possible value, effectively
1610 // marking the variable as undefined.
1611 initEnv.info.enclVar = v;
1612 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1613 try {
1614 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1615 // strict instance initializer in a value class
1616 initEnv.info.ctorPrologue = true;
1617 }
1618 attribExpr(tree.init, initEnv, v.type);
1619 if (tree.isImplicitlyTyped()) {
1620 //fixup local variable type
1621 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1622 }
1623 if (allowValueClasses && v.owner.kind == TYP && !v.isStatic()) {
1624 // strict field initializers are inlined in constructor's prologues
1625 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(initEnv,
1626 !v.isStrict() ? PrologueVisitorMode.WARNINGS_ONLY : PrologueVisitorMode.SUPER_CONSTRUCTOR);
1627 ctorPrologueVisitor.scan(tree.init);
1628 }
1629 } finally {
1630 initEnv.info.ctorPrologue = previousCtorPrologue;
1631 }
1632 }
1633 if (tree.isImplicitlyTyped()) {
1634 setSyntheticVariableType(tree, v.type);
1635 }
1636 }
1637 result = tree.type = v.type;
1638 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1639 if (isNonArgsMethodInObject(v.name)) {
1640 log.error(tree, Errors.IllegalRecordComponentName(v));
1641 }
1642 }
1643 chk.checkRequiresIdentity(tree, env.info.lint);
1644 }
1645 finally {
1646 chk.setLint(prevLint);
1647 }
1648 }
1649
1650 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1651 if (tree.init != null &&
1652 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1653 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1654 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1655 // Field initializer expression need to be entered.
1656 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym);
1657 annotate.flush();
1658 }
1659 }
1660
1661 private boolean isNonArgsMethodInObject(Name name) {
1662 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1663 if (s.type.getParameterTypes().isEmpty()) {
1664 return true;
1665 }
1666 }
1667 return false;
1668 }
1669
1670 Fragment canInferLocalVarType(JCVariableDecl tree) {
1671 LocalInitScanner lis = new LocalInitScanner();
1672 lis.scan(tree.init);
1673 return lis.badInferenceMsg;
1674 }
1675
1676 static class LocalInitScanner extends TreeScanner {
1677 Fragment badInferenceMsg = null;
1678 boolean needsTarget = true;
1679
1680 @Override
1681 public void visitNewArray(JCNewArray tree) {
1682 if (tree.elemtype == null && needsTarget) {
1683 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1684 }
1685 }
1686
1687 @Override
1688 public void visitLambda(JCLambda tree) {
1689 if (needsTarget) {
1690 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1691 }
1692 }
1693
1694 @Override
1695 public void visitTypeCast(JCTypeCast tree) {
1696 boolean prevNeedsTarget = needsTarget;
1697 try {
1698 needsTarget = false;
1699 super.visitTypeCast(tree);
1700 } finally {
1701 needsTarget = prevNeedsTarget;
1702 }
1703 }
1704
1705 @Override
1706 public void visitReference(JCMemberReference tree) {
1707 if (needsTarget) {
1708 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1709 }
1710 }
1711
1712 @Override
1713 public void visitNewClass(JCNewClass tree) {
1714 boolean prevNeedsTarget = needsTarget;
1715 try {
1716 needsTarget = false;
1717 super.visitNewClass(tree);
1718 } finally {
1719 needsTarget = prevNeedsTarget;
1720 }
1721 }
1722
1723 @Override
1724 public void visitApply(JCMethodInvocation tree) {
1725 boolean prevNeedsTarget = needsTarget;
1726 try {
1727 needsTarget = false;
1728 super.visitApply(tree);
1729 } finally {
1730 needsTarget = prevNeedsTarget;
1731 }
1732 }
1733 }
1734
1735 public void visitSkip(JCSkip tree) {
1736 result = null;
1737 }
1738
1739 public void visitBlock(JCBlock tree) {
1740 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1741 // Block is a static or instance initializer;
1742 // let the owner of the environment be a freshly
1743 // created BLOCK-method.
1744 Symbol fakeOwner =
1745 new MethodSymbol(tree.flags | BLOCK |
1746 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1747 env.info.scope.owner);
1748 final Env<AttrContext> localEnv =
1749 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1750
1751 if ((tree.flags & STATIC) != 0) {
1752 localEnv.info.staticLevel++;
1753 } else {
1754 localEnv.info.instanceInitializerBlock = true;
1755 }
1756 // Attribute all type annotations in the block
1757 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1758 annotate.flush();
1759 attribStats(tree.stats, localEnv);
1760
1761 {
1762 // Store init and clinit type annotations with the ClassSymbol
1763 // to allow output in Gen.normalizeDefs.
1764 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1765 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1766 if ((tree.flags & STATIC) != 0) {
1767 cs.appendClassInitTypeAttributes(tas);
1768 } else {
1769 cs.appendInitTypeAttributes(tas);
1770 }
1771 }
1772 } else {
1773 // Create a new local environment with a local scope.
1774 Env<AttrContext> localEnv =
1775 env.dup(tree, env.info.dup(env.info.scope.dup()));
1776 try {
1777 attribStats(tree.stats, localEnv);
1778 } finally {
1779 localEnv.info.scope.leave();
1780 }
1781 }
1782 result = null;
1783 }
1784
1785 public void visitDoLoop(JCDoWhileLoop tree) {
1786 attribStat(tree.body, env.dup(tree));
1787 attribExpr(tree.cond, env, syms.booleanType);
1788 handleLoopConditionBindings(matchBindings, tree, tree.body);
1789 result = null;
1790 }
1791
1792 public void visitWhileLoop(JCWhileLoop tree) {
1793 attribExpr(tree.cond, env, syms.booleanType);
1794 MatchBindings condBindings = matchBindings;
1795 // include condition's bindings when true in the body:
1796 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1797 try {
1798 attribStat(tree.body, whileEnv.dup(tree));
1799 } finally {
1800 whileEnv.info.scope.leave();
1801 }
1802 handleLoopConditionBindings(condBindings, tree, tree.body);
1803 result = null;
1804 }
1805
1806 public void visitForLoop(JCForLoop tree) {
1807 Env<AttrContext> loopEnv =
1808 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1809 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1810 try {
1811 attribStats(tree.init, loopEnv);
1812 if (tree.cond != null) {
1813 attribExpr(tree.cond, loopEnv, syms.booleanType);
1814 // include condition's bindings when true in the body and step:
1815 condBindings = matchBindings;
1816 }
1817 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1818 try {
1819 bodyEnv.tree = tree; // before, we were not in loop!
1820 attribStats(tree.step, bodyEnv);
1821 attribStat(tree.body, bodyEnv);
1822 } finally {
1823 bodyEnv.info.scope.leave();
1824 }
1825 result = null;
1826 }
1827 finally {
1828 loopEnv.info.scope.leave();
1829 }
1830 handleLoopConditionBindings(condBindings, tree, tree.body);
1831 }
1832
1833 /**
1834 * Include condition's bindings when false after the loop, if cannot get out of the loop
1835 */
1836 private void handleLoopConditionBindings(MatchBindings condBindings,
1837 JCStatement loop,
1838 JCStatement loopBody) {
1839 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1840 !breaksTo(env, loop, loopBody)) {
1841 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1842 }
1843 }
1844
1845 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1846 preFlow(body);
1847 return flow.breaksToTree(env, loop, body, make);
1848 }
1849
1850 /**
1851 * Add given bindings to the current scope, unless there's a break to
1852 * an immediately enclosing labeled statement.
1853 */
1854 private void addBindings2Scope(JCStatement introducingStatement,
1855 List<BindingSymbol> bindings) {
1856 if (bindings.isEmpty()) {
1857 return ;
1858 }
1859
1860 var searchEnv = env;
1861 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1862 labeled.body == introducingStatement) {
1863 if (breaksTo(env, labeled, labeled.body)) {
1864 //breaking to an immediately enclosing labeled statement
1865 return ;
1866 }
1867 searchEnv = searchEnv.next;
1868 introducingStatement = labeled;
1869 }
1870
1871 //include condition's body when false after the while, if cannot get out of the loop
1872 bindings.forEach(env.info.scope::enter);
1873 bindings.forEach(BindingSymbol::preserveBinding);
1874 }
1875
1876 public void visitForeachLoop(JCEnhancedForLoop tree) {
1877 Env<AttrContext> loopEnv =
1878 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1879 try {
1880 //the Formal Parameter of a for-each loop is not in the scope when
1881 //attributing the for-each expression; we mimic this by attributing
1882 //the for-each expression first (against original scope).
1883 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1884 chk.checkNonVoid(tree.pos(), exprType);
1885 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1886 if (elemtype == null) {
1887 // or perhaps expr implements Iterable<T>?
1888 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1889 if (base == null) {
1890 log.error(tree.expr.pos(),
1891 Errors.ForeachNotApplicableToType(exprType,
1892 Fragments.TypeReqArrayOrIterable));
1893 elemtype = types.createErrorType(exprType);
1894 } else {
1895 List<Type> iterableParams = base.allparams();
1896 elemtype = iterableParams.isEmpty()
1897 ? syms.objectType
1898 : types.wildUpperBound(iterableParams.head);
1899
1900 // Check the return type of the method iterator().
1901 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1902 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1903 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1904 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1905 log.error(tree.pos(),
1906 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1907 }
1908 }
1909 }
1910 if (tree.var.isImplicitlyTyped()) {
1911 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1912 setSyntheticVariableType(tree.var, inferredType);
1913 }
1914 attribStat(tree.var, loopEnv);
1915 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1916 loopEnv.tree = tree; // before, we were not in loop!
1917 attribStat(tree.body, loopEnv);
1918 result = null;
1919 }
1920 finally {
1921 loopEnv.info.scope.leave();
1922 }
1923 }
1924
1925 public void visitLabelled(JCLabeledStatement tree) {
1926 // Check that label is not used in an enclosing statement
1927 Env<AttrContext> env1 = env;
1928 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1929 if (env1.tree.hasTag(LABELLED) &&
1930 ((JCLabeledStatement) env1.tree).label == tree.label) {
1931 log.error(tree.pos(),
1932 Errors.LabelAlreadyInUse(tree.label));
1933 break;
1934 }
1935 env1 = env1.next;
1936 }
1937
1938 attribStat(tree.body, env.dup(tree));
1939 result = null;
1940 }
1941
1942 public void visitSwitch(JCSwitch tree) {
1943 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1944 attribStats(c.stats, caseEnv);
1945 });
1946 result = null;
1947 }
1948
1949 public void visitSwitchExpression(JCSwitchExpression tree) {
1950 boolean wrongContext = false;
1951
1952 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1953 PolyKind.STANDALONE : PolyKind.POLY;
1954
1955 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1956 //this means we are returning a poly conditional from void-compatible lambda expression
1957 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1958 resultInfo = recoveryInfo;
1959 wrongContext = true;
1960 }
1961
1962 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1963 unknownExprInfo :
1964 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1965
1966 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1967 ListBuffer<Type> caseTypes = new ListBuffer<>();
1968
1969 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1970 caseEnv.info.yieldResult = condInfo;
1971 attribStats(c.stats, caseEnv);
1972 new TreeScanner() {
1973 @Override
1974 public void visitYield(JCYield brk) {
1975 if (brk.target == tree) {
1976 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1977 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1978 }
1979 super.visitYield(brk);
1980 }
1981
1982 @Override public void visitClassDef(JCClassDecl tree) {}
1983 @Override public void visitLambda(JCLambda tree) {}
1984 }.scan(c.stats);
1985 });
1986
1987 if (tree.cases.isEmpty()) {
1988 log.error(tree.pos(),
1989 Errors.SwitchExpressionEmpty);
1990 } else if (caseTypes.isEmpty()) {
1991 log.error(tree.pos(),
1992 Errors.SwitchExpressionNoResultExpressions);
1993 }
1994
1995 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1996
1997 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1998 }
1999 //where:
2000 CheckContext switchExpressionContext(CheckContext checkContext) {
2001 return new Check.NestedCheckContext(checkContext) {
2002 //this will use enclosing check context to check compatibility of
2003 //subexpression against target type; if we are in a method check context,
2004 //depending on whether boxing is allowed, we could have incompatibilities
2005 @Override
2006 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2007 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
2008 }
2009 };
2010 }
2011
2012 private void handleSwitch(JCTree switchTree,
2013 JCExpression selector,
2014 List<JCCase> cases,
2015 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
2016 Type seltype = attribExpr(selector, env);
2017 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
2018
2019 Env<AttrContext> switchEnv =
2020 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
2021
2022 try {
2023 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
2024 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
2025 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
2026 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
2027 boolean intSwitch = types.isAssignable(seltype, syms.intType);
2028 boolean patternSwitch;
2029 if (seltype.isPrimitive() && !intSwitch) {
2030 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
2031 patternSwitch = true;
2032 }
2033 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
2034 !intSwitch) {
2035 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
2036 patternSwitch = true;
2037 } else {
2038 patternSwitch = cases.stream()
2039 .flatMap(c -> c.labels.stream())
2040 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
2041 TreeInfo.isNullCaseLabel(l));
2042 }
2043
2044 // Attribute all cases and
2045 // check that there are no duplicate case labels or default clauses.
2046 Set<Object> constants = new HashSet<>(); // The set of case constants.
2047 boolean hasDefault = false; // Is there a default label?
2048 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
2049 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
2050 boolean hasNullPattern = false; // Is there a null pattern?
2051 CaseTree.CaseKind caseKind = null;
2052 boolean wasError = false;
2053 JCCaseLabel unconditionalCaseLabel = null;
2054 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
2055 JCCase c = l.head;
2056 if (caseKind == null) {
2057 caseKind = c.caseKind;
2058 } else if (caseKind != c.caseKind && !wasError) {
2059 log.error(c.pos(),
2060 Errors.SwitchMixingCaseTypes);
2061 wasError = true;
2062 }
2063 MatchBindings currentBindings = null;
2064 MatchBindings guardBindings = null;
2065 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
2066 JCCaseLabel label = labels.head;
2067 if (label instanceof JCConstantCaseLabel constLabel) {
2068 JCExpression expr = constLabel.expr;
2069 if (TreeInfo.isNull(expr)) {
2070 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
2071 if (hasNullPattern) {
2072 log.error(label.pos(), Errors.DuplicateCaseLabel);
2073 }
2074 hasNullPattern = true;
2075 attribExpr(expr, switchEnv, seltype);
2076 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
2077 } else if (enumSwitch) {
2078 Symbol sym = enumConstant(expr, seltype);
2079 if (sym == null) {
2080 if (allowPatternSwitch) {
2081 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2082 Symbol enumSym = TreeInfo.symbol(expr);
2083 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
2084 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
2085 } else if (!constants.add(enumSym)) {
2086 log.error(label.pos(), Errors.DuplicateCaseLabel);
2087 }
2088 } else {
2089 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
2090 }
2091 } else if (!constants.add(sym)) {
2092 log.error(label.pos(), Errors.DuplicateCaseLabel);
2093 }
2094 } else if (errorEnumSwitch) {
2095 //error recovery: the selector is erroneous, and all the case labels
2096 //are identifiers. This could be an enum switch - don't report resolve
2097 //error for the case label:
2098 var prevResolveHelper = rs.basicLogResolveHelper;
2099 try {
2100 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
2101 attribExpr(expr, switchEnv, seltype);
2102 } finally {
2103 rs.basicLogResolveHelper = prevResolveHelper;
2104 }
2105 } else {
2106 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2107 if (!pattype.hasTag(ERROR)) {
2108 if (pattype.constValue() == null) {
2109 Symbol s = TreeInfo.symbol(expr);
2110 if (s != null && s.kind == TYP) {
2111 log.error(expr.pos(),
2112 Errors.PatternExpected);
2113 } else if (s == null || !s.isEnum()) {
2114 log.error(expr.pos(),
2115 (stringSwitch ? Errors.StringConstReq
2116 : intSwitch ? Errors.ConstExprReq
2117 : Errors.PatternOrEnumReq));
2118 } else if (!constants.add(s)) {
2119 log.error(label.pos(), Errors.DuplicateCaseLabel);
2120 }
2121 }
2122 else {
2123 boolean isLongFloatDoubleOrBooleanConstant =
2124 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
2125 if (isLongFloatDoubleOrBooleanConstant) {
2126 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
2127 }
2128 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
2129 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
2130 } else if (!constants.add(pattype.constValue())) {
2131 log.error(c.pos(), Errors.DuplicateCaseLabel);
2132 }
2133 }
2134 }
2135 }
2136 } else if (label instanceof JCDefaultCaseLabel def) {
2137 if (hasDefault) {
2138 log.error(label.pos(), Errors.DuplicateDefaultLabel);
2139 } else if (hasUnconditionalPattern) {
2140 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
2141 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2142 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
2143 }
2144 hasDefault = true;
2145 matchBindings = MatchBindingsComputer.EMPTY;
2146 } else if (label instanceof JCPatternCaseLabel patternlabel) {
2147 //pattern
2148 JCPattern pat = patternlabel.pat;
2149 attribExpr(pat, switchEnv, seltype);
2150 Type primaryType = TreeInfo.primaryPatternType(pat);
2151
2152 if (primaryType.isPrimitive()) {
2153 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
2154 } else if (!primaryType.hasTag(TYPEVAR)) {
2155 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
2156 }
2157 checkCastablePattern(pat.pos(), seltype, primaryType);
2158 Type patternType = types.erasure(primaryType);
2159 JCExpression guard = c.guard;
2160 if (guardBindings == null && guard != null) {
2161 MatchBindings afterPattern = matchBindings;
2162 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
2163 try {
2164 attribExpr(guard, bodyEnv, syms.booleanType);
2165 } finally {
2166 bodyEnv.info.scope.leave();
2167 }
2168
2169 guardBindings = matchBindings;
2170 matchBindings = afterPattern;
2171
2172 if (TreeInfo.isBooleanWithValue(guard, 0)) {
2173 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
2174 }
2175 }
2176 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
2177 boolean unconditional =
2178 unguarded &&
2179 !patternType.isErroneous() &&
2180 types.isUnconditionallyExact(seltype, patternType);
2181 if (unconditional) {
2182 if (hasUnconditionalPattern) {
2183 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
2184 } else if (hasDefault) {
2185 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
2186 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2187 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
2188 }
2189 hasUnconditionalPattern = true;
2190 unconditionalCaseLabel = label;
2191 }
2192 lastPatternErroneous = patternType.isErroneous();
2193 } else {
2194 Assert.error();
2195 }
2196 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
2197 }
2198
2199 if (guardBindings != null) {
2200 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
2201 }
2202
2203 Env<AttrContext> caseEnv =
2204 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
2205 try {
2206 attribCase.accept(c, caseEnv);
2207 } finally {
2208 caseEnv.info.scope.leave();
2209 }
2210 addVars(c.stats, switchEnv.info.scope);
2211
2212 preFlow(c);
2213 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
2214 }
2215 if (patternSwitch) {
2216 chk.checkSwitchCaseStructure(cases);
2217 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
2218 }
2219 if (switchTree.hasTag(SWITCH)) {
2220 ((JCSwitch) switchTree).hasUnconditionalPattern =
2221 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2222 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
2223 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
2224 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
2225 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2226 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
2227 } else {
2228 Assert.error(switchTree.getTag().name());
2229 }
2230 } finally {
2231 switchEnv.info.scope.leave();
2232 }
2233 }
2234 // where
2235 private ResultInfo caseLabelResultInfo(Type seltype) {
2236 return new ResultInfo(KindSelector.VAL_TYP,
2237 !seltype.hasTag(ERROR) ? seltype
2238 : Type.noType);
2239 }
2240 /** Add any variables defined in stats to the switch scope. */
2241 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
2242 for (;stats.nonEmpty(); stats = stats.tail) {
2243 JCTree stat = stats.head;
2244 if (stat.hasTag(VARDEF))
2245 switchScope.enter(((JCVariableDecl) stat).sym);
2246 }
2247 }
2248 // where
2249 /** Return the selected enumeration constant symbol, or null. */
2250 private Symbol enumConstant(JCTree tree, Type enumType) {
2251 if (tree.hasTag(IDENT)) {
2252 JCIdent ident = (JCIdent)tree;
2253 Name name = ident.name;
2254 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
2255 if (sym.kind == VAR) {
2256 Symbol s = ident.sym = sym;
2257 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
2258 ident.type = s.type;
2259 return ((s.flags_field & Flags.ENUM) == 0)
2260 ? null : s;
2261 }
2262 }
2263 }
2264 return null;
2265 }
2266
2267 public void visitSynchronized(JCSynchronized tree) {
2268 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
2269 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
2270 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
2271 }
2272 attribStat(tree.body, env);
2273 result = null;
2274 }
2275
2276 public void visitTry(JCTry tree) {
2277 // Create a new local environment with a local
2278 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
2279 try {
2280 boolean isTryWithResource = tree.resources.nonEmpty();
2281 // Create a nested environment for attributing the try block if needed
2282 Env<AttrContext> tryEnv = isTryWithResource ?
2283 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2284 localEnv;
2285 try {
2286 // Attribute resource declarations
2287 for (JCTree resource : tree.resources) {
2288 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
2289 @Override
2290 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2291 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
2292 }
2293 };
2294 ResultInfo twrResult =
2295 new ResultInfo(KindSelector.VAR,
2296 syms.autoCloseableType,
2297 twrContext);
2298 if (resource.hasTag(VARDEF)) {
2299 attribStat(resource, tryEnv);
2300 twrResult.check(resource, resource.type);
2301
2302 //check that resource type cannot throw InterruptedException
2303 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2304
2305 VarSymbol var = ((JCVariableDecl) resource).sym;
2306
2307 var.flags_field |= Flags.FINAL;
2308 var.setData(ElementKind.RESOURCE_VARIABLE);
2309 } else {
2310 attribTree(resource, tryEnv, twrResult);
2311 }
2312 }
2313 // Attribute body
2314 attribStat(tree.body, tryEnv);
2315 } finally {
2316 if (isTryWithResource)
2317 tryEnv.info.scope.leave();
2318 }
2319
2320 // Attribute catch clauses
2321 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2322 JCCatch c = l.head;
2323 Env<AttrContext> catchEnv =
2324 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2325 try {
2326 Type ctype = attribStat(c.param, catchEnv);
2327 if (TreeInfo.isMultiCatch(c)) {
2328 //multi-catch parameter is implicitly marked as final
2329 c.param.sym.flags_field |= FINAL | UNION;
2330 }
2331 if (c.param.sym.kind == VAR) {
2332 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2333 }
2334 chk.checkType(c.param.vartype.pos(),
2335 chk.checkClassType(c.param.vartype.pos(), ctype),
2336 syms.throwableType);
2337 attribStat(c.body, catchEnv);
2338 } finally {
2339 catchEnv.info.scope.leave();
2340 }
2341 }
2342
2343 // Attribute finalizer
2344 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2345 result = null;
2346 }
2347 finally {
2348 localEnv.info.scope.leave();
2349 }
2350 }
2351
2352 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2353 if (!resource.isErroneous() &&
2354 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2355 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2356 Symbol close = syms.noSymbol;
2357 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2358 try {
2359 close = rs.resolveQualifiedMethod(pos,
2360 env,
2361 types.skipTypeVars(resource, false),
2362 names.close,
2363 List.nil(),
2364 List.nil());
2365 }
2366 finally {
2367 log.popDiagnosticHandler(discardHandler);
2368 }
2369 if (close.kind == MTH &&
2370 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2371 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2372 log.warning(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2373 }
2374 }
2375 }
2376
2377 public void visitConditional(JCConditional tree) {
2378 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2379 MatchBindings condBindings = matchBindings;
2380
2381 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2382 isBooleanOrNumeric(env, tree)) ?
2383 PolyKind.STANDALONE : PolyKind.POLY;
2384
2385 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2386 //this means we are returning a poly conditional from void-compatible lambda expression
2387 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2388 result = tree.type = types.createErrorType(resultInfo.pt);
2389 return;
2390 }
2391
2392 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2393 unknownExprInfo :
2394 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2395
2396
2397 // x ? y : z
2398 // include x's bindings when true in y
2399 // include x's bindings when false in z
2400
2401 Type truetype;
2402 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2403 try {
2404 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2405 } finally {
2406 trueEnv.info.scope.leave();
2407 }
2408
2409 MatchBindings trueBindings = matchBindings;
2410
2411 Type falsetype;
2412 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2413 try {
2414 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2415 } finally {
2416 falseEnv.info.scope.leave();
2417 }
2418
2419 MatchBindings falseBindings = matchBindings;
2420
2421 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2422 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2423 List.of(truetype, falsetype)) : pt();
2424 if (condtype.constValue() != null &&
2425 truetype.constValue() != null &&
2426 falsetype.constValue() != null &&
2427 !owntype.hasTag(NONE)) {
2428 //constant folding
2429 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2430 }
2431 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2432 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2433 }
2434 //where
2435 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2436 switch (tree.getTag()) {
2437 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2438 ((JCLiteral)tree).typetag == BOOLEAN ||
2439 ((JCLiteral)tree).typetag == BOT;
2440 case LAMBDA: case REFERENCE: return false;
2441 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2442 case CONDEXPR:
2443 JCConditional condTree = (JCConditional)tree;
2444 return isBooleanOrNumeric(env, condTree.truepart) &&
2445 isBooleanOrNumeric(env, condTree.falsepart);
2446 case APPLY:
2447 JCMethodInvocation speculativeMethodTree =
2448 (JCMethodInvocation)deferredAttr.attribSpeculative(
2449 tree, env, unknownExprInfo,
2450 argumentAttr.withLocalCacheContext());
2451 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2452 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2453 env.enclClass.type :
2454 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2455 Type owntype = types.memberType(receiverType, msym).getReturnType();
2456 return primitiveOrBoxed(owntype);
2457 case NEWCLASS:
2458 JCExpression className =
2459 removeClassParams.translate(((JCNewClass)tree).clazz);
2460 JCExpression speculativeNewClassTree =
2461 (JCExpression)deferredAttr.attribSpeculative(
2462 className, env, unknownTypeInfo,
2463 argumentAttr.withLocalCacheContext());
2464 return primitiveOrBoxed(speculativeNewClassTree.type);
2465 default:
2466 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2467 argumentAttr.withLocalCacheContext()).type;
2468 return primitiveOrBoxed(speculativeType);
2469 }
2470 }
2471 //where
2472 boolean primitiveOrBoxed(Type t) {
2473 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2474 }
2475
2476 TreeTranslator removeClassParams = new TreeTranslator() {
2477 @Override
2478 public void visitTypeApply(JCTypeApply tree) {
2479 result = translate(tree.clazz);
2480 }
2481 };
2482
2483 CheckContext conditionalContext(CheckContext checkContext) {
2484 return new Check.NestedCheckContext(checkContext) {
2485 //this will use enclosing check context to check compatibility of
2486 //subexpression against target type; if we are in a method check context,
2487 //depending on whether boxing is allowed, we could have incompatibilities
2488 @Override
2489 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2490 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2491 }
2492 };
2493 }
2494
2495 /** Compute the type of a conditional expression, after
2496 * checking that it exists. See JLS 15.25. Does not take into
2497 * account the special case where condition and both arms
2498 * are constants.
2499 *
2500 * @param pos The source position to be used for error
2501 * diagnostics.
2502 * @param thentype The type of the expression's then-part.
2503 * @param elsetype The type of the expression's else-part.
2504 */
2505 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2506 if (condTypes.isEmpty()) {
2507 return syms.objectType; //TODO: how to handle?
2508 }
2509 Type first = condTypes.head;
2510 // If same type, that is the result
2511 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2512 return first.baseType();
2513
2514 List<Type> unboxedTypes = condTypes.stream()
2515 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2516 .collect(List.collector());
2517
2518 // Otherwise, if both arms can be converted to a numeric
2519 // type, return the least numeric type that fits both arms
2520 // (i.e. return larger of the two, or return int if one
2521 // arm is short, the other is char).
2522 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2523 // If one arm has an integer subrange type (i.e., byte,
2524 // short, or char), and the other is an integer constant
2525 // that fits into the subrange, return the subrange type.
2526 for (Type type : unboxedTypes) {
2527 if (!type.getTag().isStrictSubRangeOf(INT)) {
2528 continue;
2529 }
2530 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2531 return type.baseType();
2532 }
2533
2534 for (TypeTag tag : primitiveTags) {
2535 Type candidate = syms.typeOfTag[tag.ordinal()];
2536 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2537 return candidate;
2538 }
2539 }
2540 }
2541
2542 // Those were all the cases that could result in a primitive
2543 condTypes = condTypes.stream()
2544 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2545 .collect(List.collector());
2546
2547 for (Type type : condTypes) {
2548 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2549 return type.baseType();
2550 }
2551
2552 Iterator<DiagnosticPosition> posIt = positions.iterator();
2553
2554 condTypes = condTypes.stream()
2555 .map(t -> chk.checkNonVoid(posIt.next(), t))
2556 .collect(List.collector());
2557
2558 // both are known to be reference types. The result is
2559 // lub(thentype,elsetype). This cannot fail, as it will
2560 // always be possible to infer "Object" if nothing better.
2561 return types.lub(condTypes.stream()
2562 .map(t -> t.baseType())
2563 .filter(t -> !t.hasTag(BOT))
2564 .collect(List.collector()));
2565 }
2566
2567 static final TypeTag[] primitiveTags = new TypeTag[]{
2568 BYTE,
2569 CHAR,
2570 SHORT,
2571 INT,
2572 LONG,
2573 FLOAT,
2574 DOUBLE,
2575 BOOLEAN,
2576 };
2577
2578 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2579 return bindingEnv(env, env.tree, bindings);
2580 }
2581
2582 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2583 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2584 bindings.forEach(env1.info.scope::enter);
2585 return env1;
2586 }
2587
2588 public void visitIf(JCIf tree) {
2589 attribExpr(tree.cond, env, syms.booleanType);
2590
2591 // if (x) { y } [ else z ]
2592 // include x's bindings when true in y
2593 // include x's bindings when false in z
2594
2595 MatchBindings condBindings = matchBindings;
2596 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2597
2598 try {
2599 attribStat(tree.thenpart, thenEnv);
2600 } finally {
2601 thenEnv.info.scope.leave();
2602 }
2603
2604 preFlow(tree.thenpart);
2605 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2606 boolean aliveAfterElse;
2607
2608 if (tree.elsepart != null) {
2609 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2610 try {
2611 attribStat(tree.elsepart, elseEnv);
2612 } finally {
2613 elseEnv.info.scope.leave();
2614 }
2615 preFlow(tree.elsepart);
2616 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2617 } else {
2618 aliveAfterElse = true;
2619 }
2620
2621 chk.checkEmptyIf(tree);
2622
2623 List<BindingSymbol> afterIfBindings = List.nil();
2624
2625 if (aliveAfterThen && !aliveAfterElse) {
2626 afterIfBindings = condBindings.bindingsWhenTrue;
2627 } else if (aliveAfterElse && !aliveAfterThen) {
2628 afterIfBindings = condBindings.bindingsWhenFalse;
2629 }
2630
2631 addBindings2Scope(tree, afterIfBindings);
2632
2633 result = null;
2634 }
2635
2636 void preFlow(JCTree tree) {
2637 attrRecover.doRecovery();
2638 new PostAttrAnalyzer() {
2639 @Override
2640 public void scan(JCTree tree) {
2641 if (tree == null ||
2642 (tree.type != null &&
2643 tree.type == Type.stuckType)) {
2644 //don't touch stuck expressions!
2645 return;
2646 }
2647 super.scan(tree);
2648 }
2649
2650 @Override
2651 public void visitClassDef(JCClassDecl that) {
2652 if (that.sym != null) {
2653 // Method preFlow shouldn't visit class definitions
2654 // that have not been entered and attributed.
2655 // See JDK-8254557 and JDK-8203277 for more details.
2656 super.visitClassDef(that);
2657 }
2658 }
2659
2660 @Override
2661 public void visitLambda(JCLambda that) {
2662 if (that.type != null) {
2663 // Method preFlow shouldn't visit lambda expressions
2664 // that have not been entered and attributed.
2665 // See JDK-8254557 and JDK-8203277 for more details.
2666 super.visitLambda(that);
2667 }
2668 }
2669 }.scan(tree);
2670 }
2671
2672 public void visitExec(JCExpressionStatement tree) {
2673 //a fresh environment is required for 292 inference to work properly ---
2674 //see Infer.instantiatePolymorphicSignatureInstance()
2675 Env<AttrContext> localEnv = env.dup(tree);
2676 attribExpr(tree.expr, localEnv);
2677 result = null;
2678 }
2679
2680 public void visitBreak(JCBreak tree) {
2681 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2682 result = null;
2683 }
2684
2685 public void visitYield(JCYield tree) {
2686 if (env.info.yieldResult != null) {
2687 attribTree(tree.value, env, env.info.yieldResult);
2688 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2689 } else {
2690 log.error(tree.pos(), tree.value.hasTag(PARENS)
2691 ? Errors.NoSwitchExpressionQualify
2692 : Errors.NoSwitchExpression);
2693 attribTree(tree.value, env, unknownExprInfo);
2694 }
2695 result = null;
2696 }
2697
2698 public void visitContinue(JCContinue tree) {
2699 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2700 result = null;
2701 }
2702 //where
2703 /** Return the target of a break, continue or yield statement,
2704 * if it exists, report an error if not.
2705 * Note: The target of a labelled break or continue is the
2706 * (non-labelled) statement tree referred to by the label,
2707 * not the tree representing the labelled statement itself.
2708 *
2709 * @param pos The position to be used for error diagnostics
2710 * @param tag The tag of the jump statement. This is either
2711 * Tree.BREAK or Tree.CONTINUE.
2712 * @param label The label of the jump statement, or null if no
2713 * label is given.
2714 * @param env The environment current at the jump statement.
2715 */
2716 private JCTree findJumpTarget(DiagnosticPosition pos,
2717 JCTree.Tag tag,
2718 Name label,
2719 Env<AttrContext> env) {
2720 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2721
2722 if (jumpTarget.snd != null) {
2723 log.error(pos, jumpTarget.snd);
2724 }
2725
2726 return jumpTarget.fst;
2727 }
2728 /** Return the target of a break or continue statement, if it exists,
2729 * report an error if not.
2730 * Note: The target of a labelled break or continue is the
2731 * (non-labelled) statement tree referred to by the label,
2732 * not the tree representing the labelled statement itself.
2733 *
2734 * @param tag The tag of the jump statement. This is either
2735 * Tree.BREAK or Tree.CONTINUE.
2736 * @param label The label of the jump statement, or null if no
2737 * label is given.
2738 * @param env The environment current at the jump statement.
2739 */
2740 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2741 Name label,
2742 Env<AttrContext> env) {
2743 // Search environments outwards from the point of jump.
2744 Env<AttrContext> env1 = env;
2745 JCDiagnostic.Error pendingError = null;
2746 LOOP:
2747 while (env1 != null) {
2748 switch (env1.tree.getTag()) {
2749 case LABELLED:
2750 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2751 if (label == labelled.label) {
2752 // If jump is a continue, check that target is a loop.
2753 if (tag == CONTINUE) {
2754 if (!labelled.body.hasTag(DOLOOP) &&
2755 !labelled.body.hasTag(WHILELOOP) &&
2756 !labelled.body.hasTag(FORLOOP) &&
2757 !labelled.body.hasTag(FOREACHLOOP)) {
2758 pendingError = Errors.NotLoopLabel(label);
2759 }
2760 // Found labelled statement target, now go inwards
2761 // to next non-labelled tree.
2762 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2763 } else {
2764 return Pair.of(labelled, pendingError);
2765 }
2766 }
2767 break;
2768 case DOLOOP:
2769 case WHILELOOP:
2770 case FORLOOP:
2771 case FOREACHLOOP:
2772 if (label == null) return Pair.of(env1.tree, pendingError);
2773 break;
2774 case SWITCH:
2775 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2776 break;
2777 case SWITCH_EXPRESSION:
2778 if (tag == YIELD) {
2779 return Pair.of(env1.tree, null);
2780 } else if (tag == BREAK) {
2781 pendingError = Errors.BreakOutsideSwitchExpression;
2782 } else {
2783 pendingError = Errors.ContinueOutsideSwitchExpression;
2784 }
2785 break;
2786 case LAMBDA:
2787 case METHODDEF:
2788 case CLASSDEF:
2789 break LOOP;
2790 default:
2791 }
2792 env1 = env1.next;
2793 }
2794 if (label != null)
2795 return Pair.of(null, Errors.UndefLabel(label));
2796 else if (pendingError != null)
2797 return Pair.of(null, pendingError);
2798 else if (tag == CONTINUE)
2799 return Pair.of(null, Errors.ContOutsideLoop);
2800 else
2801 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2802 }
2803
2804 public void visitReturn(JCReturn tree) {
2805 // Check that there is an enclosing method which is
2806 // nested within than the enclosing class.
2807 if (env.info.returnResult == null) {
2808 log.error(tree.pos(), Errors.RetOutsideMeth);
2809 } else if (env.info.yieldResult != null) {
2810 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2811 if (tree.expr != null) {
2812 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2813 }
2814 } else if (!env.info.isLambda &&
2815 env.enclMethod != null &&
2816 TreeInfo.isCompactConstructor(env.enclMethod)) {
2817 log.error(env.enclMethod,
2818 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2819 } else {
2820 // Attribute return expression, if it exists, and check that
2821 // it conforms to result type of enclosing method.
2822 if (tree.expr != null) {
2823 if (env.info.returnResult.pt.hasTag(VOID)) {
2824 env.info.returnResult.checkContext.report(tree.expr.pos(),
2825 diags.fragment(Fragments.UnexpectedRetVal));
2826 }
2827 attribTree(tree.expr, env, env.info.returnResult);
2828 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2829 !env.info.returnResult.pt.hasTag(NONE)) {
2830 env.info.returnResult.checkContext.report(tree.pos(),
2831 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2832 }
2833 }
2834 result = null;
2835 }
2836
2837 public void visitThrow(JCThrow tree) {
2838 Type owntype = attribExpr(tree.expr, env, Type.noType);
2839 chk.checkType(tree, owntype, syms.throwableType);
2840 result = null;
2841 }
2842
2843 public void visitAssert(JCAssert tree) {
2844 attribExpr(tree.cond, env, syms.booleanType);
2845 if (tree.detail != null) {
2846 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2847 }
2848 result = null;
2849 }
2850
2851 /** Visitor method for method invocations.
2852 * NOTE: The method part of an application will have in its type field
2853 * the return type of the method, not the method's type itself!
2854 */
2855 public void visitApply(JCMethodInvocation tree) {
2856 // The local environment of a method application is
2857 // a new environment nested in the current one.
2858 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2859
2860 // The types of the actual method arguments.
2861 List<Type> argtypes;
2862
2863 // The types of the actual method type arguments.
2864 List<Type> typeargtypes = null;
2865
2866 Name methName = TreeInfo.name(tree.meth);
2867
2868 boolean isConstructorCall =
2869 methName == names._this || methName == names._super;
2870
2871 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2872 if (isConstructorCall) {
2873
2874 // Attribute arguments, yielding list of argument types.
2875 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2876 argtypes = argtypesBuf.toList();
2877 typeargtypes = attribTypes(tree.typeargs, localEnv);
2878
2879 // Done with this()/super() parameters. End of constructor prologue.
2880 env.info.ctorPrologue = false;
2881
2882 // Variable `site' points to the class in which the called
2883 // constructor is defined.
2884 Type site = env.enclClass.sym.type;
2885 if (methName == names._super) {
2886 if (site == syms.objectType) {
2887 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2888 site = types.createErrorType(syms.objectType);
2889 } else {
2890 site = types.supertype(site);
2891 }
2892 }
2893
2894 if (site.hasTag(CLASS)) {
2895 Type encl = site.getEnclosingType();
2896 while (encl != null && encl.hasTag(TYPEVAR))
2897 encl = encl.getUpperBound();
2898 if (encl.hasTag(CLASS)) {
2899 // we are calling a nested class
2900
2901 if (tree.meth.hasTag(SELECT)) {
2902 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2903
2904 // We are seeing a prefixed call, of the form
2905 // <expr>.super(...).
2906 // Check that the prefix expression conforms
2907 // to the outer instance type of the class.
2908 chk.checkRefType(qualifier.pos(),
2909 attribExpr(qualifier, localEnv,
2910 encl));
2911 }
2912 } else if (tree.meth.hasTag(SELECT)) {
2913 log.error(tree.meth.pos(),
2914 Errors.IllegalQualNotIcls(site.tsym));
2915 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2916 }
2917
2918 if (tree.meth.hasTag(IDENT)) {
2919 // non-qualified super(...) call; check whether explicit constructor
2920 // invocation is well-formed. If the super class is an inner class,
2921 // make sure that an appropriate implicit qualifier exists. If the super
2922 // class is a local class, make sure that the current class is defined
2923 // in the same context as the local class.
2924 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2925 }
2926
2927 // if we're calling a java.lang.Enum constructor,
2928 // prefix the implicit String and int parameters
2929 if (site.tsym == syms.enumSym)
2930 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2931
2932 // Resolve the called constructor under the assumption
2933 // that we are referring to a superclass instance of the
2934 // current instance (JLS ???).
2935 boolean selectSuperPrev = localEnv.info.selectSuper;
2936 localEnv.info.selectSuper = true;
2937 localEnv.info.pendingResolutionPhase = null;
2938 Symbol sym = rs.resolveConstructor(
2939 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2940 localEnv.info.selectSuper = selectSuperPrev;
2941
2942 // Set method symbol to resolved constructor...
2943 TreeInfo.setSymbol(tree.meth, sym);
2944
2945 // ...and check that it is legal in the current context.
2946 // (this will also set the tree's type)
2947 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2948 checkId(tree.meth, site, sym, localEnv,
2949 new ResultInfo(kind, mpt));
2950 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2951 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2952 }
2953 // Otherwise, `site' is an error type and we do nothing
2954 result = tree.type = syms.voidType;
2955 } else {
2956 // Otherwise, we are seeing a regular method call.
2957 // Attribute the arguments, yielding list of argument types, ...
2958 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2959 argtypes = argtypesBuf.toList();
2960 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2961
2962 // ... and attribute the method using as a prototype a methodtype
2963 // whose formal argument types is exactly the list of actual
2964 // arguments (this will also set the method symbol).
2965 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2966 localEnv.info.pendingResolutionPhase = null;
2967 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2968
2969 // Compute the result type.
2970 Type restype = mtype.getReturnType();
2971 if (restype.hasTag(WILDCARD))
2972 throw new AssertionError(mtype);
2973
2974 Type qualifier = (tree.meth.hasTag(SELECT))
2975 ? ((JCFieldAccess) tree.meth).selected.type
2976 : env.enclClass.sym.type;
2977 Symbol msym = TreeInfo.symbol(tree.meth);
2978 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2979
2980 chk.checkRefTypes(tree.typeargs, typeargtypes);
2981
2982 // Check that value of resulting type is admissible in the
2983 // current context. Also, capture the return type
2984 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2985 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2986 }
2987 chk.checkRequiresIdentity(tree, env.info.lint);
2988 chk.validate(tree.typeargs, localEnv);
2989 }
2990 //where
2991 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2992 if (msym != null &&
2993 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2994 methodName == names.getClass &&
2995 argtypes.isEmpty()) {
2996 // as a special case, x.getClass() has type Class<? extends |X|>
2997 return new ClassType(restype.getEnclosingType(),
2998 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2999 BoundKind.EXTENDS,
3000 syms.boundClass)),
3001 restype.tsym,
3002 restype.getMetadata());
3003 } else if (msym != null &&
3004 msym.owner == syms.arrayClass &&
3005 methodName == names.clone &&
3006 types.isArray(qualifierType)) {
3007 // as a special case, array.clone() has a result that is
3008 // the same as static type of the array being cloned
3009 return qualifierType;
3010 } else {
3011 return restype;
3012 }
3013 }
3014
3015 /** Obtain a method type with given argument types.
3016 */
3017 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
3018 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
3019 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
3020 }
3021
3022 public void visitNewClass(final JCNewClass tree) {
3023 Type owntype = types.createErrorType(tree.type);
3024
3025 // The local environment of a class creation is
3026 // a new environment nested in the current one.
3027 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
3028
3029 // The anonymous inner class definition of the new expression,
3030 // if one is defined by it.
3031 JCClassDecl cdef = tree.def;
3032
3033 // If enclosing class is given, attribute it, and
3034 // complete class name to be fully qualified
3035 JCExpression clazz = tree.clazz; // Class field following new
3036 JCExpression clazzid; // Identifier in class field
3037 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
3038 annoclazzid = null;
3039
3040 if (clazz.hasTag(TYPEAPPLY)) {
3041 clazzid = ((JCTypeApply) clazz).clazz;
3042 if (clazzid.hasTag(ANNOTATED_TYPE)) {
3043 annoclazzid = (JCAnnotatedType) clazzid;
3044 clazzid = annoclazzid.underlyingType;
3045 }
3046 } else {
3047 if (clazz.hasTag(ANNOTATED_TYPE)) {
3048 annoclazzid = (JCAnnotatedType) clazz;
3049 clazzid = annoclazzid.underlyingType;
3050 } else {
3051 clazzid = clazz;
3052 }
3053 }
3054
3055 JCExpression clazzid1 = clazzid; // The same in fully qualified form
3056
3057 if (tree.encl != null) {
3058 // We are seeing a qualified new, of the form
3059 // <expr>.new C <...> (...) ...
3060 // In this case, we let clazz stand for the name of the
3061 // allocated class C prefixed with the type of the qualifier
3062 // expression, so that we can
3063 // resolve it with standard techniques later. I.e., if
3064 // <expr> has type T, then <expr>.new C <...> (...)
3065 // yields a clazz T.C.
3066 Type encltype = chk.checkRefType(tree.encl.pos(),
3067 attribExpr(tree.encl, env));
3068 // TODO 308: in <expr>.new C, do we also want to add the type annotations
3069 // from expr to the combined type, or not? Yes, do this.
3070 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
3071 ((JCIdent) clazzid).name);
3072
3073 EndPosTable endPosTable = this.env.toplevel.endPositions;
3074 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
3075 if (clazz.hasTag(ANNOTATED_TYPE)) {
3076 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
3077 List<JCAnnotation> annos = annoType.annotations;
3078
3079 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
3080 clazzid1 = make.at(tree.pos).
3081 TypeApply(clazzid1,
3082 ((JCTypeApply) clazz).arguments);
3083 }
3084
3085 clazzid1 = make.at(tree.pos).
3086 AnnotatedType(annos, clazzid1);
3087 } else if (clazz.hasTag(TYPEAPPLY)) {
3088 clazzid1 = make.at(tree.pos).
3089 TypeApply(clazzid1,
3090 ((JCTypeApply) clazz).arguments);
3091 }
3092
3093 clazz = clazzid1;
3094 }
3095
3096 // Attribute clazz expression and store
3097 // symbol + type back into the attributed tree.
3098 Type clazztype;
3099
3100 try {
3101 env.info.isAnonymousNewClass = tree.def != null;
3102 clazztype = TreeInfo.isEnumInit(env.tree) ?
3103 attribIdentAsEnumType(env, (JCIdent)clazz) :
3104 attribType(clazz, env);
3105 } finally {
3106 env.info.isAnonymousNewClass = false;
3107 }
3108
3109 clazztype = chk.checkDiamond(tree, clazztype);
3110 chk.validate(clazz, localEnv);
3111 if (tree.encl != null) {
3112 // We have to work in this case to store
3113 // symbol + type back into the attributed tree.
3114 tree.clazz.type = clazztype;
3115 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
3116 clazzid.type = ((JCIdent) clazzid).sym.type;
3117 if (annoclazzid != null) {
3118 annoclazzid.type = clazzid.type;
3119 }
3120 if (!clazztype.isErroneous()) {
3121 if (cdef != null && clazztype.tsym.isInterface()) {
3122 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
3123 } else if (clazztype.tsym.isStatic()) {
3124 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
3125 }
3126 }
3127 } else {
3128 // Check for the existence of an apropos outer instance
3129 checkNewInnerClass(tree.pos(), env, clazztype, false);
3130 }
3131
3132 // Attribute constructor arguments.
3133 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
3134 final KindSelector pkind =
3135 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
3136 List<Type> argtypes = argtypesBuf.toList();
3137 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
3138
3139 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
3140 // Enums may not be instantiated except implicitly
3141 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
3142 (!env.tree.hasTag(VARDEF) ||
3143 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
3144 ((JCVariableDecl) env.tree).init != tree))
3145 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
3146
3147 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
3148 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3149 boolean skipNonDiamondPath = false;
3150 // Check that class is not abstract
3151 if (cdef == null && !tree.classDeclRemoved() && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
3152 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
3153 log.error(tree.pos(),
3154 Errors.AbstractCantBeInstantiated(clazztype.tsym));
3155 skipNonDiamondPath = true;
3156 } else if (cdef != null && clazztype.tsym.isInterface()) {
3157 // Check that no constructor arguments are given to
3158 // anonymous classes implementing an interface
3159 if (!argtypes.isEmpty())
3160 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
3161
3162 if (!typeargtypes.isEmpty())
3163 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
3164
3165 // Error recovery: pretend no arguments were supplied.
3166 argtypes = List.nil();
3167 typeargtypes = List.nil();
3168 skipNonDiamondPath = true;
3169 }
3170 if (TreeInfo.isDiamond(tree)) {
3171 ClassType site = new ClassType(clazztype.getEnclosingType(),
3172 clazztype.tsym.type.getTypeArguments(),
3173 clazztype.tsym,
3174 clazztype.getMetadata());
3175
3176 Env<AttrContext> diamondEnv = localEnv.dup(tree);
3177 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
3178 diamondEnv.info.pendingResolutionPhase = null;
3179
3180 //if the type of the instance creation expression is a class type
3181 //apply method resolution inference (JLS 15.12.2.7). The return type
3182 //of the resolved constructor will be a partially instantiated type
3183 Symbol constructor = rs.resolveDiamond(tree.pos(),
3184 diamondEnv,
3185 site,
3186 argtypes,
3187 typeargtypes);
3188 tree.constructor = constructor.baseSymbol();
3189
3190 final TypeSymbol csym = clazztype.tsym;
3191 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
3192 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3193 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
3194 constructorType = checkId(tree, site,
3195 constructor,
3196 diamondEnv,
3197 diamondResult);
3198
3199 tree.clazz.type = types.createErrorType(clazztype);
3200 if (!constructorType.isErroneous()) {
3201 tree.clazz.type = clazz.type = constructorType.getReturnType();
3202 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
3203 }
3204 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
3205 }
3206
3207 // Resolve the called constructor under the assumption
3208 // that we are referring to a superclass instance of the
3209 // current instance (JLS ???).
3210 else if (!skipNonDiamondPath) {
3211 //the following code alters some of the fields in the current
3212 //AttrContext - hence, the current context must be dup'ed in
3213 //order to avoid downstream failures
3214 Env<AttrContext> rsEnv = localEnv.dup(tree);
3215 rsEnv.info.selectSuper = cdef != null;
3216 rsEnv.info.pendingResolutionPhase = null;
3217 tree.constructor = rs.resolveConstructor(
3218 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
3219 if (cdef == null) { //do not check twice!
3220 tree.constructorType = checkId(tree,
3221 clazztype,
3222 tree.constructor,
3223 rsEnv,
3224 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3225 if (rsEnv.info.lastResolveVarargs())
3226 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
3227 }
3228 }
3229
3230 chk.checkRequiresIdentity(tree, env.info.lint);
3231
3232 if (cdef != null) {
3233 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
3234 return;
3235 }
3236
3237 if (tree.constructor != null && tree.constructor.kind == MTH)
3238 owntype = clazztype;
3239 }
3240 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3241 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3242 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
3243 //we need to wait for inference to finish and then replace inference vars in the constructor type
3244 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
3245 instantiatedContext -> {
3246 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3247 });
3248 }
3249 chk.validate(tree.typeargs, localEnv);
3250 }
3251
3252 // where
3253 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
3254 JCClassDecl cdef, Env<AttrContext> localEnv,
3255 List<Type> argtypes, List<Type> typeargtypes,
3256 KindSelector pkind) {
3257 // We are seeing an anonymous class instance creation.
3258 // In this case, the class instance creation
3259 // expression
3260 //
3261 // E.new <typeargs1>C<typargs2>(args) { ... }
3262 //
3263 // is represented internally as
3264 //
3265 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
3266 //
3267 // This expression is then *transformed* as follows:
3268 //
3269 // (1) add an extends or implements clause
3270 // (2) add a constructor.
3271 //
3272 // For instance, if C is a class, and ET is the type of E,
3273 // the expression
3274 //
3275 // E.new <typeargs1>C<typargs2>(args) { ... }
3276 //
3277 // is translated to (where X is a fresh name and typarams is the
3278 // parameter list of the super constructor):
3279 //
3280 // new <typeargs1>X(<*nullchk*>E, args) where
3281 // X extends C<typargs2> {
3282 // <typarams> X(ET e, args) {
3283 // e.<typeargs1>super(args)
3284 // }
3285 // ...
3286 // }
3287 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3288 Type enclType = clazztype.getEnclosingType();
3289 if (enclType != null &&
3290 enclType.hasTag(CLASS) &&
3291 !chk.checkDenotable((ClassType)enclType)) {
3292 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
3293 }
3294 final boolean isDiamond = TreeInfo.isDiamond(tree);
3295 if (isDiamond
3296 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3297 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3298 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3299 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3300 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3301 instantiatedContext -> {
3302 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3303 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3304 ResultInfo prevResult = this.resultInfo;
3305 try {
3306 this.resultInfo = resultInfoForClassDefinition;
3307 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3308 dupLocalEnv, argtypes, typeargtypes, pkind);
3309 } finally {
3310 this.resultInfo = prevResult;
3311 }
3312 });
3313 } else {
3314 if (isDiamond && clazztype.hasTag(CLASS)) {
3315 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3316 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3317 // One or more types inferred in the previous steps is non-denotable.
3318 Fragment fragment = Diamond(clazztype.tsym);
3319 log.error(tree.clazz.pos(),
3320 Errors.CantApplyDiamond1(
3321 fragment,
3322 invalidDiamondArgs.size() > 1 ?
3323 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3324 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3325 }
3326 // For <>(){}, inferred types must also be accessible.
3327 for (Type t : clazztype.getTypeArguments()) {
3328 rs.checkAccessibleType(env, t);
3329 }
3330 }
3331
3332 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3333 // false for isInterface call even when the original type is an interface.
3334 boolean implementing = clazztype.tsym.isInterface() ||
3335 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3336 clazztype.getOriginalType().tsym.isInterface();
3337
3338 if (implementing) {
3339 cdef.implementing = List.of(clazz);
3340 } else {
3341 cdef.extending = clazz;
3342 }
3343
3344 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3345 rs.isSerializable(clazztype)) {
3346 localEnv.info.isSerializable = true;
3347 }
3348
3349 attribStat(cdef, localEnv);
3350
3351 List<Type> finalargtypes;
3352 // If an outer instance is given,
3353 // prefix it to the constructor arguments
3354 // and delete it from the new expression
3355 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3356 finalargtypes = argtypes.prepend(tree.encl.type);
3357 } else {
3358 finalargtypes = argtypes;
3359 }
3360
3361 // Reassign clazztype and recompute constructor. As this necessarily involves
3362 // another attribution pass for deferred types in the case of <>, replicate
3363 // them. Original arguments have right decorations already.
3364 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3365 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3366 }
3367
3368 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3369 : cdef.sym.type;
3370 Symbol sym = tree.constructor = rs.resolveConstructor(
3371 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3372 Assert.check(!sym.kind.isResolutionError());
3373 tree.constructor = sym;
3374 tree.constructorType = checkId(tree,
3375 clazztype,
3376 tree.constructor,
3377 localEnv,
3378 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3379 }
3380 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3381 clazztype : types.createErrorType(tree.type);
3382 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3383 chk.validate(tree.typeargs, localEnv);
3384 }
3385
3386 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3387 return new Check.NestedCheckContext(checkContext) {
3388 @Override
3389 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3390 enclosingContext.report(clazz.clazz,
3391 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3392 }
3393 };
3394 }
3395
3396 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3397 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3398 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3399 (!isLocal && !type.tsym.isInner()) ||
3400 (isSuper && env.enclClass.sym.isAnonymous())) {
3401 // nothing to check
3402 return;
3403 }
3404 Symbol res = isLocal ?
3405 rs.findLocalClassOwner(env, type.tsym) :
3406 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3407 if (res.exists()) {
3408 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3409 } else {
3410 log.error(pos, Errors.EnclClassRequired(type.tsym));
3411 }
3412 }
3413
3414 /** Make an attributed null check tree.
3415 */
3416 public JCExpression makeNullCheck(JCExpression arg) {
3417 // optimization: new Outer() can never be null; skip null check
3418 if (arg.getTag() == NEWCLASS)
3419 return arg;
3420 // optimization: X.this is never null; skip null check
3421 Name name = TreeInfo.name(arg);
3422 if (name == names._this || name == names._super) return arg;
3423
3424 JCTree.Tag optag = NULLCHK;
3425 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3426 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3427 tree.type = arg.type;
3428 return tree;
3429 }
3430
3431 public void visitNewArray(JCNewArray tree) {
3432 Type owntype = types.createErrorType(tree.type);
3433 Env<AttrContext> localEnv = env.dup(tree);
3434 Type elemtype;
3435 if (tree.elemtype != null) {
3436 elemtype = attribType(tree.elemtype, localEnv);
3437 chk.validate(tree.elemtype, localEnv);
3438 owntype = elemtype;
3439 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3440 attribExpr(l.head, localEnv, syms.intType);
3441 owntype = new ArrayType(owntype, syms.arrayClass);
3442 }
3443 } else {
3444 // we are seeing an untyped aggregate { ... }
3445 // this is allowed only if the prototype is an array
3446 if (pt().hasTag(ARRAY)) {
3447 elemtype = types.elemtype(pt());
3448 } else {
3449 if (!pt().hasTag(ERROR) &&
3450 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3451 log.error(tree.pos(),
3452 Errors.IllegalInitializerForType(pt()));
3453 }
3454 elemtype = types.createErrorType(pt());
3455 }
3456 }
3457 if (tree.elems != null) {
3458 attribExprs(tree.elems, localEnv, elemtype);
3459 owntype = new ArrayType(elemtype, syms.arrayClass);
3460 }
3461 if (!types.isReifiable(elemtype))
3462 log.error(tree.pos(), Errors.GenericArrayCreation);
3463 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3464 }
3465
3466 /*
3467 * A lambda expression can only be attributed when a target-type is available.
3468 * In addition, if the target-type is that of a functional interface whose
3469 * descriptor contains inference variables in argument position the lambda expression
3470 * is 'stuck' (see DeferredAttr).
3471 */
3472 @Override
3473 public void visitLambda(final JCLambda that) {
3474 boolean wrongContext = false;
3475 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3476 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3477 //lambda only allowed in assignment or method invocation/cast context
3478 log.error(that.pos(), Errors.UnexpectedLambda);
3479 }
3480 resultInfo = recoveryInfo;
3481 wrongContext = true;
3482 }
3483 //create an environment for attribution of the lambda expression
3484 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3485 boolean needsRecovery =
3486 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3487 try {
3488 if (needsRecovery && rs.isSerializable(pt())) {
3489 localEnv.info.isSerializable = true;
3490 localEnv.info.isSerializableLambda = true;
3491 }
3492 List<Type> explicitParamTypes = null;
3493 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3494 //attribute lambda parameters
3495 attribStats(that.params, localEnv);
3496 explicitParamTypes = TreeInfo.types(that.params);
3497 }
3498
3499 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3500 Type currentTarget = targetInfo.target;
3501 Type lambdaType = targetInfo.descriptor;
3502
3503 if (currentTarget.isErroneous()) {
3504 result = that.type = currentTarget;
3505 return;
3506 }
3507
3508 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3509
3510 if (lambdaType.hasTag(FORALL)) {
3511 //lambda expression target desc cannot be a generic method
3512 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3513 kindName(currentTarget.tsym),
3514 currentTarget.tsym);
3515 resultInfo.checkContext.report(that, diags.fragment(msg));
3516 result = that.type = types.createErrorType(pt());
3517 return;
3518 }
3519
3520 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3521 //add param type info in the AST
3522 List<Type> actuals = lambdaType.getParameterTypes();
3523 List<JCVariableDecl> params = that.params;
3524
3525 boolean arityMismatch = false;
3526
3527 while (params.nonEmpty()) {
3528 if (actuals.isEmpty()) {
3529 //not enough actuals to perform lambda parameter inference
3530 arityMismatch = true;
3531 }
3532 //reset previously set info
3533 Type argType = arityMismatch ?
3534 syms.errType :
3535 actuals.head;
3536 if (params.head.isImplicitlyTyped()) {
3537 setSyntheticVariableType(params.head, argType);
3538 }
3539 params.head.sym = null;
3540 actuals = actuals.isEmpty() ?
3541 actuals :
3542 actuals.tail;
3543 params = params.tail;
3544 }
3545
3546 //attribute lambda parameters
3547 attribStats(that.params, localEnv);
3548
3549 if (arityMismatch) {
3550 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3551 result = that.type = types.createErrorType(currentTarget);
3552 return;
3553 }
3554 }
3555
3556 //from this point on, no recovery is needed; if we are in assignment context
3557 //we will be able to attribute the whole lambda body, regardless of errors;
3558 //if we are in a 'check' method context, and the lambda is not compatible
3559 //with the target-type, it will be recovered anyway in Attr.checkId
3560 needsRecovery = false;
3561
3562 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3563 lambdaBodyResult(that, lambdaType, resultInfo);
3564
3565 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3566 attribTree(that.getBody(), localEnv, bodyResultInfo);
3567 } else {
3568 JCBlock body = (JCBlock)that.body;
3569 if (body == breakTree &&
3570 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3571 breakTreeFound(copyEnv(localEnv));
3572 }
3573 attribStats(body.stats, localEnv);
3574 }
3575
3576 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3577
3578 boolean isSpeculativeRound =
3579 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3580
3581 preFlow(that);
3582 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3583
3584 that.type = currentTarget; //avoids recovery at this stage
3585 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3586
3587 if (!isSpeculativeRound) {
3588 //add thrown types as bounds to the thrown types free variables if needed:
3589 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3590 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3591 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3592 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3593 }
3594 }
3595
3596 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3597 }
3598 result = wrongContext ? that.type = types.createErrorType(pt())
3599 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3600 } catch (Types.FunctionDescriptorLookupError ex) {
3601 JCDiagnostic cause = ex.getDiagnostic();
3602 resultInfo.checkContext.report(that, cause);
3603 result = that.type = types.createErrorType(pt());
3604 return;
3605 } catch (CompletionFailure cf) {
3606 chk.completionError(that.pos(), cf);
3607 } catch (Throwable t) {
3608 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3609 //as that would likely cause the same exception again.
3610 needsRecovery = false;
3611 throw t;
3612 } finally {
3613 localEnv.info.scope.leave();
3614 if (needsRecovery) {
3615 Type prevResult = result;
3616 try {
3617 attribTree(that, env, recoveryInfo);
3618 } finally {
3619 if (result == Type.recoveryType) {
3620 result = prevResult;
3621 }
3622 }
3623 }
3624 }
3625 }
3626 //where
3627 class TargetInfo {
3628 Type target;
3629 Type descriptor;
3630
3631 public TargetInfo(Type target, Type descriptor) {
3632 this.target = target;
3633 this.descriptor = descriptor;
3634 }
3635 }
3636
3637 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3638 Type lambdaType;
3639 Type currentTarget = resultInfo.pt;
3640 if (resultInfo.pt != Type.recoveryType) {
3641 /* We need to adjust the target. If the target is an
3642 * intersection type, for example: SAM & I1 & I2 ...
3643 * the target will be updated to SAM
3644 */
3645 currentTarget = targetChecker.visit(currentTarget, that);
3646 if (!currentTarget.isIntersection()) {
3647 if (explicitParamTypes != null) {
3648 currentTarget = infer.instantiateFunctionalInterface(that,
3649 currentTarget, explicitParamTypes, resultInfo.checkContext);
3650 }
3651 currentTarget = types.removeWildcards(currentTarget);
3652 lambdaType = types.findDescriptorType(currentTarget);
3653 } else {
3654 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3655 ListBuffer<Type> components = new ListBuffer<>();
3656 for (Type bound : ict.getExplicitComponents()) {
3657 if (explicitParamTypes != null) {
3658 try {
3659 bound = infer.instantiateFunctionalInterface(that,
3660 bound, explicitParamTypes, resultInfo.checkContext);
3661 } catch (FunctionDescriptorLookupError t) {
3662 // do nothing
3663 }
3664 }
3665 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3666 // bound must be j.l.Object or an interface, but not an annotation
3667 reportIntersectionError(that, "not.an.intf.component", bound);
3668 }
3669 bound = types.removeWildcards(bound);
3670 components.add(bound);
3671 }
3672 currentTarget = types.makeIntersectionType(components.toList());
3673 currentTarget.tsym.flags_field |= INTERFACE;
3674 lambdaType = types.findDescriptorType(currentTarget);
3675 }
3676
3677 } else {
3678 currentTarget = Type.recoveryType;
3679 lambdaType = fallbackDescriptorType(that);
3680 }
3681 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3682 //lambda expression target desc cannot be a generic method
3683 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3684 kindName(currentTarget.tsym),
3685 currentTarget.tsym);
3686 resultInfo.checkContext.report(that, diags.fragment(msg));
3687 currentTarget = types.createErrorType(pt());
3688 }
3689 return new TargetInfo(currentTarget, lambdaType);
3690 }
3691
3692 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3693 resultInfo.checkContext.report(pos,
3694 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3695 }
3696
3697 void preFlow(JCLambda tree) {
3698 attrRecover.doRecovery();
3699 new PostAttrAnalyzer() {
3700 @Override
3701 public void scan(JCTree tree) {
3702 if (tree == null ||
3703 (tree.type != null &&
3704 tree.type == Type.stuckType)) {
3705 //don't touch stuck expressions!
3706 return;
3707 }
3708 super.scan(tree);
3709 }
3710
3711 @Override
3712 public void visitClassDef(JCClassDecl that) {
3713 // or class declaration trees!
3714 }
3715
3716 public void visitLambda(JCLambda that) {
3717 // or lambda expressions!
3718 }
3719 }.scan(tree.body);
3720 }
3721
3722 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3723
3724 @Override
3725 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3726 return t.isIntersection() ?
3727 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3728 }
3729
3730 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3731 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3732 return ict;
3733 }
3734
3735 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3736 ListBuffer<Type> targs = new ListBuffer<>();
3737 ListBuffer<Type> supertypes = new ListBuffer<>();
3738 for (Type i : ict.interfaces_field) {
3739 if (i.isParameterized()) {
3740 targs.appendList(i.tsym.type.allparams());
3741 }
3742 supertypes.append(i.tsym.type);
3743 }
3744 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3745 notionalIntf.allparams_field = targs.toList();
3746 notionalIntf.tsym.flags_field |= INTERFACE;
3747 return notionalIntf.tsym;
3748 }
3749 };
3750
3751 private Type fallbackDescriptorType(JCExpression tree) {
3752 switch (tree.getTag()) {
3753 case LAMBDA:
3754 JCLambda lambda = (JCLambda)tree;
3755 List<Type> argtypes = List.nil();
3756 for (JCVariableDecl param : lambda.params) {
3757 argtypes = param.vartype != null && param.vartype.type != null ?
3758 argtypes.append(param.vartype.type) :
3759 argtypes.append(syms.errType);
3760 }
3761 return new MethodType(argtypes, Type.recoveryType,
3762 List.of(syms.throwableType), syms.methodClass);
3763 case REFERENCE:
3764 return new MethodType(List.nil(), Type.recoveryType,
3765 List.of(syms.throwableType), syms.methodClass);
3766 default:
3767 Assert.error("Cannot get here!");
3768 }
3769 return null;
3770 }
3771
3772 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3773 final InferenceContext inferenceContext, final Type... ts) {
3774 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3775 }
3776
3777 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3778 final InferenceContext inferenceContext, final List<Type> ts) {
3779 if (inferenceContext.free(ts)) {
3780 inferenceContext.addFreeTypeListener(ts,
3781 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3782 } else {
3783 for (Type t : ts) {
3784 rs.checkAccessibleType(env, t);
3785 }
3786 }
3787 }
3788
3789 /**
3790 * Lambda/method reference have a special check context that ensures
3791 * that i.e. a lambda return type is compatible with the expected
3792 * type according to both the inherited context and the assignment
3793 * context.
3794 */
3795 class FunctionalReturnContext extends Check.NestedCheckContext {
3796
3797 FunctionalReturnContext(CheckContext enclosingContext) {
3798 super(enclosingContext);
3799 }
3800
3801 @Override
3802 public boolean compatible(Type found, Type req, Warner warn) {
3803 //return type must be compatible in both current context and assignment context
3804 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3805 }
3806
3807 @Override
3808 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3809 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3810 }
3811 }
3812
3813 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3814
3815 JCExpression expr;
3816 boolean expStmtExpected;
3817
3818 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3819 super(enclosingContext);
3820 this.expr = expr;
3821 }
3822
3823 @Override
3824 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3825 if (expStmtExpected) {
3826 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3827 } else {
3828 super.report(pos, details);
3829 }
3830 }
3831
3832 @Override
3833 public boolean compatible(Type found, Type req, Warner warn) {
3834 //a void return is compatible with an expression statement lambda
3835 if (req.hasTag(VOID)) {
3836 expStmtExpected = true;
3837 return TreeInfo.isExpressionStatement(expr);
3838 } else {
3839 return super.compatible(found, req, warn);
3840 }
3841 }
3842 }
3843
3844 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3845 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3846 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3847 new FunctionalReturnContext(resultInfo.checkContext);
3848
3849 return descriptor.getReturnType() == Type.recoveryType ?
3850 recoveryInfo :
3851 new ResultInfo(KindSelector.VAL,
3852 descriptor.getReturnType(), funcContext);
3853 }
3854
3855 /**
3856 * Lambda compatibility. Check that given return types, thrown types, parameter types
3857 * are compatible with the expected functional interface descriptor. This means that:
3858 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3859 * types must be compatible with the return type of the expected descriptor.
3860 */
3861 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3862 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3863
3864 //return values have already been checked - but if lambda has no return
3865 //values, we must ensure that void/value compatibility is correct;
3866 //this amounts at checking that, if a lambda body can complete normally,
3867 //the descriptor's return type must be void
3868 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3869 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3870 Fragment msg =
3871 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3872 checkContext.report(tree,
3873 diags.fragment(msg));
3874 }
3875
3876 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3877 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3878 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3879 }
3880 }
3881
3882 /* This method returns an environment to be used to attribute a lambda
3883 * expression.
3884 *
3885 * The owner of this environment is a method symbol. If the current owner
3886 * is not a method (e.g. if the lambda occurs in a field initializer), then
3887 * a synthetic method symbol owner is created.
3888 */
3889 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3890 Env<AttrContext> lambdaEnv;
3891 Symbol owner = env.info.scope.owner;
3892 if (owner.kind == VAR && owner.owner.kind == TYP) {
3893 // If the lambda is nested in a field initializer, we need to create a fake init method.
3894 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3895 // init symbol's owner).
3896 ClassSymbol enclClass = owner.enclClass();
3897 Name initName = owner.isStatic() ? names.clinit : names.init;
3898 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3899 initName, initBlockType, enclClass);
3900 initSym.params = List.nil();
3901 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3902 } else {
3903 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3904 }
3905 lambdaEnv.info.yieldResult = null;
3906 lambdaEnv.info.isLambda = true;
3907 return lambdaEnv;
3908 }
3909
3910 @Override
3911 public void visitReference(final JCMemberReference that) {
3912 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3913 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3914 //method reference only allowed in assignment or method invocation/cast context
3915 log.error(that.pos(), Errors.UnexpectedMref);
3916 }
3917 result = that.type = types.createErrorType(pt());
3918 return;
3919 }
3920 final Env<AttrContext> localEnv = env.dup(that);
3921 try {
3922 //attribute member reference qualifier - if this is a constructor
3923 //reference, the expected kind must be a type
3924 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3925
3926 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3927 exprType = chk.checkConstructorRefType(that.expr, exprType);
3928 if (!exprType.isErroneous() &&
3929 exprType.isRaw() &&
3930 that.typeargs != null) {
3931 log.error(that.expr.pos(),
3932 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3933 Fragments.MrefInferAndExplicitParams));
3934 exprType = types.createErrorType(exprType);
3935 }
3936 }
3937
3938 if (exprType.isErroneous()) {
3939 //if the qualifier expression contains problems,
3940 //give up attribution of method reference
3941 result = that.type = exprType;
3942 return;
3943 }
3944
3945 if (TreeInfo.isStaticSelector(that.expr, names)) {
3946 //if the qualifier is a type, validate it; raw warning check is
3947 //omitted as we don't know at this stage as to whether this is a
3948 //raw selector (because of inference)
3949 chk.validate(that.expr, env, false);
3950 } else {
3951 Symbol lhsSym = TreeInfo.symbol(that.expr);
3952 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3953 }
3954 //attrib type-arguments
3955 List<Type> typeargtypes = List.nil();
3956 if (that.typeargs != null) {
3957 typeargtypes = attribTypes(that.typeargs, localEnv);
3958 }
3959
3960 boolean isTargetSerializable =
3961 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3962 rs.isSerializable(pt());
3963 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3964 Type currentTarget = targetInfo.target;
3965 Type desc = targetInfo.descriptor;
3966
3967 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3968 List<Type> argtypes = desc.getParameterTypes();
3969 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3970
3971 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3972 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3973 }
3974
3975 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3976 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3977 try {
3978 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3979 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3980 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3981 } finally {
3982 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3983 }
3984
3985 Symbol refSym = refResult.fst;
3986 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3987
3988 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3989 * JDK-8075541
3990 */
3991 if (refSym.kind != MTH) {
3992 boolean targetError;
3993 switch (refSym.kind) {
3994 case ABSENT_MTH:
3995 targetError = false;
3996 break;
3997 case WRONG_MTH:
3998 case WRONG_MTHS:
3999 case AMBIGUOUS:
4000 case HIDDEN:
4001 case STATICERR:
4002 targetError = true;
4003 break;
4004 default:
4005 Assert.error("unexpected result kind " + refSym.kind);
4006 targetError = false;
4007 }
4008
4009 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
4010 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
4011 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
4012
4013 JCDiagnostic diag = diags.create(log.currentSource(), that,
4014 targetError ?
4015 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
4016 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
4017
4018 if (targetError && currentTarget == Type.recoveryType) {
4019 //a target error doesn't make sense during recovery stage
4020 //as we don't know what actual parameter types are
4021 result = that.type = currentTarget;
4022 return;
4023 } else {
4024 if (targetError) {
4025 resultInfo.checkContext.report(that, diag);
4026 } else {
4027 log.report(diag);
4028 }
4029 result = that.type = types.createErrorType(currentTarget);
4030 return;
4031 }
4032 }
4033
4034 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
4035 that.kind = lookupHelper.referenceKind(that.sym);
4036 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
4037
4038 if (desc.getReturnType() == Type.recoveryType) {
4039 // stop here
4040 result = that.type = currentTarget;
4041 return;
4042 }
4043
4044 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
4045 checkNewInnerClass(that.pos(), env, exprType, false);
4046 }
4047
4048 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
4049
4050 if (that.getMode() == ReferenceMode.INVOKE &&
4051 TreeInfo.isStaticSelector(that.expr, names) &&
4052 that.kind.isUnbound() &&
4053 lookupHelper.site.isRaw()) {
4054 chk.checkRaw(that.expr, localEnv);
4055 }
4056
4057 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
4058 exprType.getTypeArguments().nonEmpty()) {
4059 //static ref with class type-args
4060 log.error(that.expr.pos(),
4061 Errors.InvalidMref(Kinds.kindName(that.getMode()),
4062 Fragments.StaticMrefWithTargs));
4063 result = that.type = types.createErrorType(currentTarget);
4064 return;
4065 }
4066
4067 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
4068 // Check that super-qualified symbols are not abstract (JLS)
4069 rs.checkNonAbstract(that.pos(), that.sym);
4070 }
4071
4072 if (isTargetSerializable) {
4073 chk.checkAccessFromSerializableElement(that, true);
4074 }
4075 }
4076
4077 ResultInfo checkInfo =
4078 resultInfo.dup(newMethodTemplate(
4079 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
4080 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
4081 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
4082
4083 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
4084
4085 if (that.kind.isUnbound() &&
4086 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
4087 //re-generate inference constraints for unbound receiver
4088 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
4089 //cannot happen as this has already been checked - we just need
4090 //to regenerate the inference constraints, as that has been lost
4091 //as a result of the call to inferenceContext.save()
4092 Assert.error("Can't get here");
4093 }
4094 }
4095
4096 if (!refType.isErroneous()) {
4097 refType = types.createMethodTypeWithReturn(refType,
4098 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
4099 }
4100
4101 //go ahead with standard method reference compatibility check - note that param check
4102 //is a no-op (as this has been taken care during method applicability)
4103 boolean isSpeculativeRound =
4104 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
4105
4106 that.type = currentTarget; //avoids recovery at this stage
4107 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
4108 if (!isSpeculativeRound) {
4109 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
4110 }
4111 chk.checkRequiresIdentity(that, localEnv.info.lint);
4112 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
4113 } catch (Types.FunctionDescriptorLookupError ex) {
4114 JCDiagnostic cause = ex.getDiagnostic();
4115 resultInfo.checkContext.report(that, cause);
4116 result = that.type = types.createErrorType(pt());
4117 return;
4118 }
4119 }
4120 //where
4121 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
4122 //if this is a constructor reference, the expected kind must be a type
4123 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
4124 KindSelector.VAL_TYP : KindSelector.TYP,
4125 Type.noType);
4126 }
4127
4128
4129 @SuppressWarnings("fallthrough")
4130 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
4131 InferenceContext inferenceContext = checkContext.inferenceContext();
4132 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
4133
4134 Type resType;
4135 switch (tree.getMode()) {
4136 case NEW:
4137 if (!tree.expr.type.isRaw()) {
4138 resType = tree.expr.type;
4139 break;
4140 }
4141 default:
4142 resType = refType.getReturnType();
4143 }
4144
4145 Type incompatibleReturnType = resType;
4146
4147 if (returnType.hasTag(VOID)) {
4148 incompatibleReturnType = null;
4149 }
4150
4151 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
4152 if (resType.isErroneous() ||
4153 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
4154 checkContext.checkWarner(tree, resType, returnType))) {
4155 incompatibleReturnType = null;
4156 }
4157 }
4158
4159 if (incompatibleReturnType != null) {
4160 Fragment msg =
4161 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
4162 checkContext.report(tree, diags.fragment(msg));
4163 } else {
4164 if (inferenceContext.free(refType)) {
4165 // we need to wait for inference to finish and then replace inference vars in the referent type
4166 inferenceContext.addFreeTypeListener(List.of(refType),
4167 instantiatedContext -> {
4168 tree.referentType = instantiatedContext.asInstType(refType);
4169 });
4170 } else {
4171 tree.referentType = refType;
4172 }
4173 }
4174
4175 if (!speculativeAttr) {
4176 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
4177 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
4178 }
4179 }
4180 }
4181
4182 boolean checkExConstraints(
4183 List<Type> thrownByFuncExpr,
4184 List<Type> thrownAtFuncType,
4185 InferenceContext inferenceContext) {
4186 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
4187 * are not proper types
4188 */
4189 List<Type> nonProperList = thrownAtFuncType.stream()
4190 .filter(e -> inferenceContext.free(e)).collect(List.collector());
4191 List<Type> properList = thrownAtFuncType.diff(nonProperList);
4192
4193 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
4194 * in the throws clause of the invocation type of the method reference's compile-time
4195 * declaration
4196 */
4197 List<Type> checkedList = thrownByFuncExpr.stream()
4198 .filter(e -> chk.isChecked(e)).collect(List.collector());
4199
4200 /** If n = 0 (the function type's throws clause consists only of proper types), then
4201 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
4202 * in the throws clause, the constraint reduces to false; otherwise, the constraint
4203 * reduces to true
4204 */
4205 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
4206 for (Type checked : checkedList) {
4207 boolean isSubtype = false;
4208 for (Type proper : properList) {
4209 if (types.isSubtype(checked, proper)) {
4210 isSubtype = true;
4211 break;
4212 }
4213 }
4214 if (!isSubtype) {
4215 uncaughtByProperTypes.add(checked);
4216 }
4217 }
4218
4219 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
4220 return false;
4221 }
4222
4223 /** If n > 0, the constraint reduces to a set of subtyping constraints:
4224 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
4225 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
4226 */
4227 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
4228 uncaughtByProperTypes.forEach(checkedEx -> {
4229 nonProperAsUndet.forEach(nonProper -> {
4230 types.isSubtype(checkedEx, nonProper);
4231 });
4232 });
4233
4234 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
4235 */
4236 nonProperAsUndet.stream()
4237 .filter(t -> t.hasTag(UNDETVAR))
4238 .forEach(t -> ((UndetVar)t).setThrow());
4239 return true;
4240 }
4241
4242 /**
4243 * Set functional type info on the underlying AST. Note: as the target descriptor
4244 * might contain inference variables, we might need to register an hook in the
4245 * current inference context.
4246 */
4247 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4248 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4249 if (checkContext.inferenceContext().free(descriptorType)) {
4250 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4251 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4252 inferenceContext.asInstType(primaryTarget), checkContext));
4253 } else {
4254 fExpr.owner = env.info.scope.owner;
4255 if (pt.hasTag(CLASS)) {
4256 fExpr.target = primaryTarget;
4257 }
4258 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4259 pt != Type.recoveryType) {
4260 //check that functional interface class is well-formed
4261 try {
4262 /* Types.makeFunctionalInterfaceClass() may throw an exception
4263 * when it's executed post-inference. See the listener code
4264 * above.
4265 */
4266 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4267 names.empty, fExpr.target, ABSTRACT);
4268 if (csym != null) {
4269 chk.checkImplementations(env.tree, csym, csym);
4270 try {
4271 //perform an additional functional interface check on the synthetic class,
4272 //as there may be spurious errors for raw targets - because of existing issues
4273 //with membership and inheritance (see JDK-8074570).
4274 csym.flags_field |= INTERFACE;
4275 types.findDescriptorType(csym.type);
4276 } catch (FunctionDescriptorLookupError err) {
4277 resultInfo.checkContext.report(fExpr,
4278 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4279 }
4280 }
4281 } catch (Types.FunctionDescriptorLookupError ex) {
4282 JCDiagnostic cause = ex.getDiagnostic();
4283 resultInfo.checkContext.report(env.tree, cause);
4284 }
4285 }
4286 }
4287 }
4288
4289 public void visitParens(JCParens tree) {
4290 Type owntype = attribTree(tree.expr, env, resultInfo);
4291 result = check(tree, owntype, pkind(), resultInfo);
4292 Symbol sym = TreeInfo.symbol(tree);
4293 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4294 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4295 }
4296
4297 public void visitAssign(JCAssign tree) {
4298 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4299 Type capturedType = capture(owntype);
4300 attribExpr(tree.rhs, env, owntype);
4301 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4302 }
4303
4304 public void visitAssignop(JCAssignOp tree) {
4305 // Attribute arguments.
4306 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4307 Type operand = attribExpr(tree.rhs, env);
4308 // Find operator.
4309 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4310 if (operator != operators.noOpSymbol &&
4311 !owntype.isErroneous() &&
4312 !operand.isErroneous()) {
4313 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4314 chk.checkCastable(tree.rhs.pos(),
4315 operator.type.getReturnType(),
4316 owntype);
4317 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4318 }
4319 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4320 }
4321
4322 public void visitUnary(JCUnary tree) {
4323 // Attribute arguments.
4324 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4325 ? attribTree(tree.arg, env, varAssignmentInfo)
4326 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4327
4328 // Find operator.
4329 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4330 Type owntype = types.createErrorType(tree.type);
4331 if (operator != operators.noOpSymbol &&
4332 !argtype.isErroneous()) {
4333 owntype = (tree.getTag().isIncOrDecUnaryOp())
4334 ? tree.arg.type
4335 : operator.type.getReturnType();
4336 int opc = operator.opcode;
4337
4338 // If the argument is constant, fold it.
4339 if (argtype.constValue() != null) {
4340 Type ctype = cfolder.fold1(opc, argtype);
4341 if (ctype != null) {
4342 owntype = cfolder.coerce(ctype, owntype);
4343 }
4344 }
4345 }
4346 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4347 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4348 }
4349
4350 public void visitBinary(JCBinary tree) {
4351 // Attribute arguments.
4352 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4353 // x && y
4354 // include x's bindings when true in y
4355
4356 // x || y
4357 // include x's bindings when false in y
4358
4359 MatchBindings lhsBindings = matchBindings;
4360 List<BindingSymbol> propagatedBindings;
4361 switch (tree.getTag()) {
4362 case AND:
4363 propagatedBindings = lhsBindings.bindingsWhenTrue;
4364 break;
4365 case OR:
4366 propagatedBindings = lhsBindings.bindingsWhenFalse;
4367 break;
4368 default:
4369 propagatedBindings = List.nil();
4370 break;
4371 }
4372 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4373 Type right;
4374 try {
4375 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4376 } finally {
4377 rhsEnv.info.scope.leave();
4378 }
4379
4380 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4381
4382 // Find operator.
4383 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4384 Type owntype = types.createErrorType(tree.type);
4385 if (operator != operators.noOpSymbol &&
4386 !left.isErroneous() &&
4387 !right.isErroneous()) {
4388 owntype = operator.type.getReturnType();
4389 int opc = operator.opcode;
4390 // If both arguments are constants, fold them.
4391 if (left.constValue() != null && right.constValue() != null) {
4392 Type ctype = cfolder.fold2(opc, left, right);
4393 if (ctype != null) {
4394 owntype = cfolder.coerce(ctype, owntype);
4395 }
4396 }
4397
4398 // Check that argument types of a reference ==, != are
4399 // castable to each other, (JLS 15.21). Note: unboxing
4400 // comparisons will not have an acmp* opc at this point.
4401 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4402 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4403 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4404 }
4405 }
4406
4407 chk.checkDivZero(tree.rhs.pos(), operator, right);
4408 }
4409 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4410 }
4411
4412 public void visitTypeCast(final JCTypeCast tree) {
4413 Type clazztype = attribType(tree.clazz, env);
4414 chk.validate(tree.clazz, env, false);
4415 chk.checkRequiresIdentity(tree, env.info.lint);
4416 //a fresh environment is required for 292 inference to work properly ---
4417 //see Infer.instantiatePolymorphicSignatureInstance()
4418 Env<AttrContext> localEnv = env.dup(tree);
4419 //should we propagate the target type?
4420 final ResultInfo castInfo;
4421 JCExpression expr = TreeInfo.skipParens(tree.expr);
4422 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4423 if (isPoly) {
4424 //expression is a poly - we need to propagate target type info
4425 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4426 new Check.NestedCheckContext(resultInfo.checkContext) {
4427 @Override
4428 public boolean compatible(Type found, Type req, Warner warn) {
4429 return types.isCastable(found, req, warn);
4430 }
4431 });
4432 } else {
4433 //standalone cast - target-type info is not propagated
4434 castInfo = unknownExprInfo;
4435 }
4436 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4437 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4438 if (exprtype.constValue() != null)
4439 owntype = cfolder.coerce(exprtype, owntype);
4440 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4441 if (!isPoly)
4442 chk.checkRedundantCast(localEnv, tree);
4443 }
4444
4445 public void visitTypeTest(JCInstanceOf tree) {
4446 Type exprtype = attribExpr(tree.expr, env);
4447 if (exprtype.isPrimitive()) {
4448 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4449 } else {
4450 exprtype = chk.checkNullOrRefType(
4451 tree.expr.pos(), exprtype);
4452 }
4453 Type clazztype;
4454 JCTree typeTree;
4455 if (tree.pattern.getTag() == BINDINGPATTERN ||
4456 tree.pattern.getTag() == RECORDPATTERN) {
4457 attribExpr(tree.pattern, env, exprtype);
4458 clazztype = tree.pattern.type;
4459 if (types.isSubtype(exprtype, clazztype) &&
4460 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4461 tree.pattern.getTag() != RECORDPATTERN) {
4462 if (!allowUnconditionalPatternsInstanceOf) {
4463 log.error(tree.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4464 }
4465 }
4466 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4467 } else {
4468 clazztype = attribType(tree.pattern, env);
4469 typeTree = tree.pattern;
4470 chk.validate(typeTree, env, false);
4471 }
4472 if (clazztype.isPrimitive()) {
4473 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4474 } else {
4475 if (!clazztype.hasTag(TYPEVAR)) {
4476 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4477 }
4478 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4479 boolean valid = false;
4480 if (allowReifiableTypesInInstanceof) {
4481 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4482 } else {
4483 log.error(tree.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4484 allowReifiableTypesInInstanceof = true;
4485 }
4486 if (!valid) {
4487 clazztype = types.createErrorType(clazztype);
4488 }
4489 }
4490 }
4491 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4492 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4493 }
4494
4495 private boolean checkCastablePattern(DiagnosticPosition pos,
4496 Type exprType,
4497 Type pattType) {
4498 Warner warner = new Warner();
4499 // if any type is erroneous, the problem is reported elsewhere
4500 if (exprType.isErroneous() || pattType.isErroneous()) {
4501 return false;
4502 }
4503 if (!types.isCastable(exprType, pattType, warner)) {
4504 chk.basicHandler.report(pos,
4505 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4506 return false;
4507 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4508 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4509 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4510 return true;
4511 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4512 log.error(pos,
4513 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4514 return false;
4515 } else {
4516 return true;
4517 }
4518 }
4519
4520 @Override
4521 public void visitAnyPattern(JCAnyPattern tree) {
4522 result = tree.type = resultInfo.pt;
4523 }
4524
4525 public void visitBindingPattern(JCBindingPattern tree) {
4526 Type type;
4527 if (tree.var.vartype != null) {
4528 type = attribType(tree.var.vartype, env);
4529 } else {
4530 type = resultInfo.pt;
4531 }
4532 tree.type = tree.var.type = type;
4533 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4534 v.pos = tree.pos;
4535 tree.var.sym = v;
4536 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4537 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4538 }
4539 chk.validate(tree.var.vartype, env, true);
4540 if (tree.var.isImplicitlyTyped()) {
4541 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4542 : type);
4543 }
4544 annotate.annotateLater(tree.var.mods.annotations, env, v);
4545 if (!tree.var.isImplicitlyTyped()) {
4546 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v);
4547 }
4548 annotate.flush();
4549 result = tree.type;
4550 if (v.isUnnamedVariable()) {
4551 matchBindings = MatchBindingsComputer.EMPTY;
4552 } else {
4553 matchBindings = new MatchBindings(List.of(v), List.nil());
4554 }
4555 chk.checkRequiresIdentity(tree, env.info.lint);
4556 }
4557
4558 @Override
4559 public void visitRecordPattern(JCRecordPattern tree) {
4560 Type site;
4561
4562 if (tree.deconstructor == null) {
4563 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4564 tree.record = syms.errSymbol;
4565 site = tree.type = types.createErrorType(tree.record.type);
4566 } else {
4567 Type type = attribType(tree.deconstructor, env);
4568 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4569 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4570 if (inferred == null) {
4571 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4572 } else {
4573 type = inferred;
4574 }
4575 }
4576 tree.type = tree.deconstructor.type = type;
4577 site = types.capture(tree.type);
4578 }
4579
4580 List<Type> expectedRecordTypes;
4581 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4582 ClassSymbol record = (ClassSymbol) site.tsym;
4583 expectedRecordTypes = record.getRecordComponents()
4584 .stream()
4585 .map(rc -> types.memberType(site, rc))
4586 .map(t -> types.upward(t, types.captures(t)).baseType())
4587 .collect(List.collector());
4588 tree.record = record;
4589 } else {
4590 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4591 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4592 .limit(tree.nested.size())
4593 .collect(List.collector());
4594 tree.record = syms.errSymbol;
4595 }
4596 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4597 List<Type> recordTypes = expectedRecordTypes;
4598 List<JCPattern> nestedPatterns = tree.nested;
4599 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4600 try {
4601 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4602 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4603 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4604 outBindings.addAll(matchBindings.bindingsWhenTrue);
4605 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4606 nestedPatterns = nestedPatterns.tail;
4607 recordTypes = recordTypes.tail;
4608 }
4609 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4610 while (nestedPatterns.nonEmpty()) {
4611 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4612 nestedPatterns = nestedPatterns.tail;
4613 }
4614 List<Type> nestedTypes =
4615 tree.nested.stream().map(p -> p.type).collect(List.collector());
4616 log.error(tree.pos(),
4617 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4618 nestedTypes));
4619 }
4620 } finally {
4621 localEnv.info.scope.leave();
4622 }
4623 chk.validate(tree.deconstructor, env, true);
4624 result = tree.type;
4625 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4626 }
4627
4628 public void visitIndexed(JCArrayAccess tree) {
4629 Type owntype = types.createErrorType(tree.type);
4630 Type atype = attribExpr(tree.indexed, env);
4631 attribExpr(tree.index, env, syms.intType);
4632 if (types.isArray(atype))
4633 owntype = types.elemtype(atype);
4634 else if (!atype.hasTag(ERROR))
4635 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4636 if (!pkind().contains(KindSelector.VAL))
4637 owntype = capture(owntype);
4638 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4639 }
4640
4641 public void visitIdent(JCIdent tree) {
4642 Symbol sym;
4643
4644 // Find symbol
4645 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4646 // If we are looking for a method, the prototype `pt' will be a
4647 // method type with the type of the call's arguments as parameters.
4648 env.info.pendingResolutionPhase = null;
4649 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4650 } else if (tree.sym != null && tree.sym.kind != VAR) {
4651 sym = tree.sym;
4652 } else {
4653 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4654 }
4655 tree.sym = sym;
4656
4657 // Also find the environment current for the class where
4658 // sym is defined (`symEnv').
4659 Env<AttrContext> symEnv = env;
4660 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4661 sym.kind.matches(KindSelector.VAL_MTH) &&
4662 sym.owner.kind == TYP &&
4663 tree.name != names._this && tree.name != names._super) {
4664
4665 // Find environment in which identifier is defined.
4666 while (symEnv.outer != null &&
4667 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4668 symEnv = symEnv.outer;
4669 }
4670 }
4671
4672 // If symbol is a variable, ...
4673 if (sym.kind == VAR) {
4674 VarSymbol v = (VarSymbol)sym;
4675
4676 // ..., evaluate its initializer, if it has one, and check for
4677 // illegal forward reference.
4678 checkInit(tree, env, v, false);
4679
4680 // If we are expecting a variable (as opposed to a value), check
4681 // that the variable is assignable in the current environment.
4682 if (KindSelector.ASG.subset(pkind()))
4683 checkAssignable(tree.pos(), v, null, env);
4684 }
4685
4686 Env<AttrContext> env1 = env;
4687 if (sym.kind != ERR && sym.kind != TYP &&
4688 sym.owner != null && sym.owner != env1.enclClass.sym) {
4689 // If the found symbol is inaccessible, then it is
4690 // accessed through an enclosing instance. Locate this
4691 // enclosing instance:
4692 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4693 env1 = env1.outer;
4694 }
4695
4696 if (env.info.isSerializable) {
4697 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4698 }
4699
4700 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4701 }
4702
4703 public void visitSelect(JCFieldAccess tree) {
4704 // Determine the expected kind of the qualifier expression.
4705 KindSelector skind = KindSelector.NIL;
4706 if (tree.name == names._this || tree.name == names._super ||
4707 tree.name == names._class)
4708 {
4709 skind = KindSelector.TYP;
4710 } else {
4711 if (pkind().contains(KindSelector.PCK))
4712 skind = KindSelector.of(skind, KindSelector.PCK);
4713 if (pkind().contains(KindSelector.TYP))
4714 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4715 if (pkind().contains(KindSelector.VAL_MTH))
4716 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4717 }
4718
4719 // Attribute the qualifier expression, and determine its symbol (if any).
4720 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4721 Assert.check(site == tree.selected.type);
4722 if (!pkind().contains(KindSelector.TYP_PCK))
4723 site = capture(site); // Capture field access
4724
4725 // don't allow T.class T[].class, etc
4726 if (skind == KindSelector.TYP) {
4727 Type elt = site;
4728 while (elt.hasTag(ARRAY))
4729 elt = ((ArrayType)elt).elemtype;
4730 if (elt.hasTag(TYPEVAR)) {
4731 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4732 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4733 tree.sym = tree.type.tsym;
4734 return ;
4735 }
4736 }
4737
4738 // If qualifier symbol is a type or `super', assert `selectSuper'
4739 // for the selection. This is relevant for determining whether
4740 // protected symbols are accessible.
4741 Symbol sitesym = TreeInfo.symbol(tree.selected);
4742 boolean selectSuperPrev = env.info.selectSuper;
4743 env.info.selectSuper =
4744 sitesym != null &&
4745 sitesym.name == names._super;
4746
4747 // Determine the symbol represented by the selection.
4748 env.info.pendingResolutionPhase = null;
4749 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4750 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4751 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4752 sym = syms.errSymbol;
4753 }
4754 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4755 site = capture(site);
4756 sym = selectSym(tree, sitesym, site, env, resultInfo);
4757 }
4758 boolean varArgs = env.info.lastResolveVarargs();
4759 tree.sym = sym;
4760
4761 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4762 site = types.skipTypeVars(site, true);
4763 }
4764
4765 // If that symbol is a variable, ...
4766 if (sym.kind == VAR) {
4767 VarSymbol v = (VarSymbol)sym;
4768
4769 // ..., evaluate its initializer, if it has one, and check for
4770 // illegal forward reference.
4771 checkInit(tree, env, v, true);
4772
4773 // If we are expecting a variable (as opposed to a value), check
4774 // that the variable is assignable in the current environment.
4775 if (KindSelector.ASG.subset(pkind()))
4776 checkAssignable(tree.pos(), v, tree.selected, env);
4777 }
4778
4779 if (sitesym != null &&
4780 sitesym.kind == VAR &&
4781 ((VarSymbol)sitesym).isResourceVariable() &&
4782 sym.kind == MTH &&
4783 sym.name.equals(names.close) &&
4784 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4785 log.warning(tree, LintWarnings.TryExplicitCloseCall);
4786 }
4787
4788 // Disallow selecting a type from an expression
4789 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4790 tree.type = check(tree.selected, pt(),
4791 sitesym == null ?
4792 KindSelector.VAL : sitesym.kind.toSelector(),
4793 new ResultInfo(KindSelector.TYP_PCK, pt()));
4794 }
4795
4796 if (isType(sitesym)) {
4797 if (sym.name != names._this && sym.name != names._super) {
4798 // Check if type-qualified fields or methods are static (JLS)
4799 if ((sym.flags() & STATIC) == 0 &&
4800 sym.name != names._super &&
4801 (sym.kind == VAR || sym.kind == MTH)) {
4802 rs.accessBase(rs.new StaticError(sym),
4803 tree.pos(), site, sym.name, true);
4804 }
4805 }
4806 } else if (sym.kind != ERR &&
4807 (sym.flags() & STATIC) != 0 &&
4808 sym.name != names._class) {
4809 // If the qualified item is not a type and the selected item is static, report
4810 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4811 if (!sym.owner.isAnonymous()) {
4812 log.warning(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4813 } else {
4814 log.warning(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4815 }
4816 }
4817
4818 // If we are selecting an instance member via a `super', ...
4819 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4820
4821 // Check that super-qualified symbols are not abstract (JLS)
4822 rs.checkNonAbstract(tree.pos(), sym);
4823
4824 if (site.isRaw()) {
4825 // Determine argument types for site.
4826 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4827 if (site1 != null) site = site1;
4828 }
4829 }
4830
4831 if (env.info.isSerializable) {
4832 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4833 }
4834
4835 env.info.selectSuper = selectSuperPrev;
4836 result = checkId(tree, site, sym, env, resultInfo);
4837 }
4838 //where
4839 /** Determine symbol referenced by a Select expression,
4840 *
4841 * @param tree The select tree.
4842 * @param site The type of the selected expression,
4843 * @param env The current environment.
4844 * @param resultInfo The current result.
4845 */
4846 private Symbol selectSym(JCFieldAccess tree,
4847 Symbol location,
4848 Type site,
4849 Env<AttrContext> env,
4850 ResultInfo resultInfo) {
4851 DiagnosticPosition pos = tree.pos();
4852 Name name = tree.name;
4853 switch (site.getTag()) {
4854 case PACKAGE:
4855 return rs.accessBase(
4856 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4857 pos, location, site, name, true);
4858 case ARRAY:
4859 case CLASS:
4860 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4861 return rs.resolveQualifiedMethod(
4862 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4863 } else if (name == names._this || name == names._super) {
4864 return rs.resolveSelf(pos, env, site.tsym, tree);
4865 } else if (name == names._class) {
4866 // In this case, we have already made sure in
4867 // visitSelect that qualifier expression is a type.
4868 return syms.getClassField(site, types);
4869 } else {
4870 // We are seeing a plain identifier as selector.
4871 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4872 sym = rs.accessBase(sym, pos, location, site, name, true);
4873 return sym;
4874 }
4875 case WILDCARD:
4876 throw new AssertionError(tree);
4877 case TYPEVAR:
4878 // Normally, site.getUpperBound() shouldn't be null.
4879 // It should only happen during memberEnter/attribBase
4880 // when determining the supertype which *must* be
4881 // done before attributing the type variables. In
4882 // other words, we are seeing this illegal program:
4883 // class B<T> extends A<T.foo> {}
4884 Symbol sym = (site.getUpperBound() != null)
4885 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4886 : null;
4887 if (sym == null) {
4888 log.error(pos, Errors.TypeVarCantBeDeref);
4889 return syms.errSymbol;
4890 } else {
4891 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4892 rs.new AccessError(env, site, sym) :
4893 sym;
4894 rs.accessBase(sym2, pos, location, site, name, true);
4895 return sym;
4896 }
4897 case ERROR:
4898 // preserve identifier names through errors
4899 return types.createErrorType(name, site.tsym, site).tsym;
4900 default:
4901 // The qualifier expression is of a primitive type -- only
4902 // .class is allowed for these.
4903 if (name == names._class) {
4904 // In this case, we have already made sure in Select that
4905 // qualifier expression is a type.
4906 return syms.getClassField(site, types);
4907 } else {
4908 log.error(pos, Errors.CantDeref(site));
4909 return syms.errSymbol;
4910 }
4911 }
4912 }
4913
4914 /** Determine type of identifier or select expression and check that
4915 * (1) the referenced symbol is not deprecated
4916 * (2) the symbol's type is safe (@see checkSafe)
4917 * (3) if symbol is a variable, check that its type and kind are
4918 * compatible with the prototype and protokind.
4919 * (4) if symbol is an instance field of a raw type,
4920 * which is being assigned to, issue an unchecked warning if its
4921 * type changes under erasure.
4922 * (5) if symbol is an instance method of a raw type, issue an
4923 * unchecked warning if its argument types change under erasure.
4924 * If checks succeed:
4925 * If symbol is a constant, return its constant type
4926 * else if symbol is a method, return its result type
4927 * otherwise return its type.
4928 * Otherwise return errType.
4929 *
4930 * @param tree The syntax tree representing the identifier
4931 * @param site If this is a select, the type of the selected
4932 * expression, otherwise the type of the current class.
4933 * @param sym The symbol representing the identifier.
4934 * @param env The current environment.
4935 * @param resultInfo The expected result
4936 */
4937 Type checkId(JCTree tree,
4938 Type site,
4939 Symbol sym,
4940 Env<AttrContext> env,
4941 ResultInfo resultInfo) {
4942 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4943 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4944 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4945 }
4946
4947 Type checkMethodIdInternal(JCTree tree,
4948 Type site,
4949 Symbol sym,
4950 Env<AttrContext> env,
4951 ResultInfo resultInfo) {
4952 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4953 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4954 } else {
4955 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4956 }
4957 }
4958
4959 Type checkIdInternal(JCTree tree,
4960 Type site,
4961 Symbol sym,
4962 Type pt,
4963 Env<AttrContext> env,
4964 ResultInfo resultInfo) {
4965 Type owntype; // The computed type of this identifier occurrence.
4966 switch (sym.kind) {
4967 case TYP:
4968 // For types, the computed type equals the symbol's type,
4969 // except for two situations:
4970 owntype = sym.type;
4971 if (owntype.hasTag(CLASS)) {
4972 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4973 Type ownOuter = owntype.getEnclosingType();
4974
4975 // (a) If the symbol's type is parameterized, erase it
4976 // because no type parameters were given.
4977 // We recover generic outer type later in visitTypeApply.
4978 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4979 owntype = types.erasure(owntype);
4980 }
4981
4982 // (b) If the symbol's type is an inner class, then
4983 // we have to interpret its outer type as a superclass
4984 // of the site type. Example:
4985 //
4986 // class Tree<A> { class Visitor { ... } }
4987 // class PointTree extends Tree<Point> { ... }
4988 // ...PointTree.Visitor...
4989 //
4990 // Then the type of the last expression above is
4991 // Tree<Point>.Visitor.
4992 else if ((ownOuter.hasTag(CLASS) || ownOuter.hasTag(TYPEVAR)) && site != ownOuter) {
4993 Type normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4994 if (normOuter == null) // perhaps from an import
4995 normOuter = types.erasure(ownOuter);
4996 if (normOuter != ownOuter)
4997 owntype = new ClassType(
4998 normOuter, List.nil(), owntype.tsym,
4999 owntype.getMetadata());
5000 }
5001 }
5002 break;
5003 case VAR:
5004 VarSymbol v = (VarSymbol)sym;
5005
5006 if (env.info.enclVar != null
5007 && v.type.hasTag(NONE)) {
5008 //self reference to implicitly typed variable declaration
5009 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
5010 return tree.type = v.type = types.createErrorType(v.type);
5011 }
5012
5013 // Test (4): if symbol is an instance field of a raw type,
5014 // which is being assigned to, issue an unchecked warning if
5015 // its type changes under erasure.
5016 if (KindSelector.ASG.subset(pkind()) &&
5017 v.owner.kind == TYP &&
5018 (v.flags() & STATIC) == 0 &&
5019 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5020 Type s = types.asOuterSuper(site, v.owner);
5021 if (s != null &&
5022 s.isRaw() &&
5023 !types.isSameType(v.type, v.erasure(types))) {
5024 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
5025 }
5026 }
5027 // The computed type of a variable is the type of the
5028 // variable symbol, taken as a member of the site type.
5029 owntype = (sym.owner.kind == TYP &&
5030 sym.name != names._this && sym.name != names._super)
5031 ? types.memberType(site, sym)
5032 : sym.type;
5033
5034 // If the variable is a constant, record constant value in
5035 // computed type.
5036 if (v.getConstValue() != null && isStaticReference(tree))
5037 owntype = owntype.constType(v.getConstValue());
5038
5039 if (resultInfo.pkind == KindSelector.VAL) {
5040 owntype = capture(owntype); // capture "names as expressions"
5041 }
5042 break;
5043 case MTH: {
5044 owntype = checkMethod(site, sym,
5045 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
5046 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
5047 resultInfo.pt.getTypeArguments());
5048 chk.checkRestricted(tree.pos(), sym);
5049 break;
5050 }
5051 case PCK: case ERR:
5052 owntype = sym.type;
5053 break;
5054 default:
5055 throw new AssertionError("unexpected kind: " + sym.kind +
5056 " in tree " + tree);
5057 }
5058
5059 // Emit a `deprecation' warning if symbol is deprecated.
5060 // (for constructors (but not for constructor references), the error
5061 // was given when the constructor was resolved)
5062
5063 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
5064 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
5065 chk.checkSunAPI(tree.pos(), sym);
5066 chk.checkProfile(tree.pos(), sym);
5067 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
5068 }
5069
5070 if (pt.isErroneous()) {
5071 owntype = types.createErrorType(owntype);
5072 }
5073
5074 // If symbol is a variable, check that its type and
5075 // kind are compatible with the prototype and protokind.
5076 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
5077 }
5078
5079 /** Check that variable is initialized and evaluate the variable's
5080 * initializer, if not yet done. Also check that variable is not
5081 * referenced before it is defined.
5082 * @param tree The tree making up the variable reference.
5083 * @param env The current environment.
5084 * @param v The variable's symbol.
5085 */
5086 private void checkInit(JCTree tree,
5087 Env<AttrContext> env,
5088 VarSymbol v,
5089 boolean onlyWarning) {
5090 // A forward reference is diagnosed if the declaration position
5091 // of the variable is greater than the current tree position
5092 // and the tree and variable definition occur in the same class
5093 // definition. Note that writes don't count as references.
5094 // This check applies only to class and instance
5095 // variables. Local variables follow different scope rules,
5096 // and are subject to definite assignment checking.
5097 Env<AttrContext> initEnv = enclosingInitEnv(env);
5098 if (initEnv != null &&
5099 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
5100 v.owner.kind == TYP &&
5101 v.owner == env.info.scope.owner.enclClass() &&
5102 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
5103 (!env.tree.hasTag(ASSIGN) ||
5104 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
5105 if (!onlyWarning || isStaticEnumField(v)) {
5106 Error errkey = (initEnv.info.enclVar == v) ?
5107 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
5108 log.error(tree.pos(), errkey);
5109 } else if (useBeforeDeclarationWarning) {
5110 Warning warnkey = (initEnv.info.enclVar == v) ?
5111 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
5112 log.warning(tree.pos(), warnkey);
5113 }
5114 }
5115
5116 v.getConstValue(); // ensure initializer is evaluated
5117
5118 checkEnumInitializer(tree, env, v);
5119 }
5120
5121 /**
5122 * Returns the enclosing init environment associated with this env (if any). An init env
5123 * can be either a field declaration env or a static/instance initializer env.
5124 */
5125 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
5126 while (true) {
5127 switch (env.tree.getTag()) {
5128 case VARDEF:
5129 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
5130 if (vdecl.sym.owner.kind == TYP) {
5131 //field
5132 return env;
5133 }
5134 break;
5135 case BLOCK:
5136 if (env.next.tree.hasTag(CLASSDEF)) {
5137 //instance/static initializer
5138 return env;
5139 }
5140 break;
5141 case METHODDEF:
5142 case CLASSDEF:
5143 case TOPLEVEL:
5144 return null;
5145 }
5146 Assert.checkNonNull(env.next);
5147 env = env.next;
5148 }
5149 }
5150
5151 /**
5152 * Check for illegal references to static members of enum. In
5153 * an enum type, constructors and initializers may not
5154 * reference its static members unless they are constant.
5155 *
5156 * @param tree The tree making up the variable reference.
5157 * @param env The current environment.
5158 * @param v The variable's symbol.
5159 * @jls 8.9 Enum Types
5160 */
5161 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
5162 // JLS:
5163 //
5164 // "It is a compile-time error to reference a static field
5165 // of an enum type that is not a compile-time constant
5166 // (15.28) from constructors, instance initializer blocks,
5167 // or instance variable initializer expressions of that
5168 // type. It is a compile-time error for the constructors,
5169 // instance initializer blocks, or instance variable
5170 // initializer expressions of an enum constant e to refer
5171 // to itself or to an enum constant of the same type that
5172 // is declared to the right of e."
5173 if (isStaticEnumField(v)) {
5174 ClassSymbol enclClass = env.info.scope.owner.enclClass();
5175
5176 if (enclClass == null || enclClass.owner == null)
5177 return;
5178
5179 // See if the enclosing class is the enum (or a
5180 // subclass thereof) declaring v. If not, this
5181 // reference is OK.
5182 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
5183 return;
5184
5185 // If the reference isn't from an initializer, then
5186 // the reference is OK.
5187 if (!Resolve.isInitializer(env))
5188 return;
5189
5190 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
5191 }
5192 }
5193
5194 /** Is the given symbol a static, non-constant field of an Enum?
5195 * Note: enum literals should not be regarded as such
5196 */
5197 private boolean isStaticEnumField(VarSymbol v) {
5198 return Flags.isEnum(v.owner) &&
5199 Flags.isStatic(v) &&
5200 !Flags.isConstant(v) &&
5201 v.name != names._class;
5202 }
5203
5204 /**
5205 * Check that method arguments conform to its instantiation.
5206 **/
5207 public Type checkMethod(Type site,
5208 final Symbol sym,
5209 ResultInfo resultInfo,
5210 Env<AttrContext> env,
5211 final List<JCExpression> argtrees,
5212 List<Type> argtypes,
5213 List<Type> typeargtypes) {
5214 // Test (5): if symbol is an instance method of a raw type, issue
5215 // an unchecked warning if its argument types change under erasure.
5216 if ((sym.flags() & STATIC) == 0 &&
5217 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5218 Type s = types.asOuterSuper(site, sym.owner);
5219 if (s != null && s.isRaw() &&
5220 !types.isSameTypes(sym.type.getParameterTypes(),
5221 sym.erasure(types).getParameterTypes())) {
5222 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
5223 }
5224 }
5225
5226 if (env.info.defaultSuperCallSite != null) {
5227 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5228 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5229 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5230 List<MethodSymbol> icand_sup =
5231 types.interfaceCandidates(sup, (MethodSymbol)sym);
5232 if (icand_sup.nonEmpty() &&
5233 icand_sup.head != sym &&
5234 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5235 log.error(env.tree.pos(),
5236 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5237 break;
5238 }
5239 }
5240 env.info.defaultSuperCallSite = null;
5241 }
5242
5243 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5244 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5245 if (app.meth.hasTag(SELECT) &&
5246 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5247 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5248 }
5249 }
5250
5251 // Compute the identifier's instantiated type.
5252 // For methods, we need to compute the instance type by
5253 // Resolve.instantiate from the symbol's type as well as
5254 // any type arguments and value arguments.
5255 Warner noteWarner = new Warner();
5256 try {
5257 Type owntype = rs.checkMethod(
5258 env,
5259 site,
5260 sym,
5261 resultInfo,
5262 argtypes,
5263 typeargtypes,
5264 noteWarner);
5265
5266 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5267 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5268
5269 argtypes = argtypes.map(checkDeferredMap);
5270
5271 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5272 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5273 sym.name,
5274 rs.methodArguments(sym.type.getParameterTypes()),
5275 rs.methodArguments(argtypes.map(checkDeferredMap)),
5276 kindName(sym.location()),
5277 sym.location()));
5278 if (resultInfo.pt != Infer.anyPoly ||
5279 !owntype.hasTag(METHOD) ||
5280 !owntype.isPartial()) {
5281 //if this is not a partially inferred method type, erase return type. Otherwise,
5282 //erasure is carried out in PartiallyInferredMethodType.check().
5283 owntype = new MethodType(owntype.getParameterTypes(),
5284 types.erasure(owntype.getReturnType()),
5285 types.erasure(owntype.getThrownTypes()),
5286 syms.methodClass);
5287 }
5288 }
5289
5290 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5291 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5292 PolyKind.POLY : PolyKind.STANDALONE;
5293 TreeInfo.setPolyKind(env.tree, pkind);
5294
5295 return (resultInfo.pt == Infer.anyPoly) ?
5296 owntype :
5297 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5298 resultInfo.checkContext.inferenceContext());
5299 } catch (Infer.InferenceException ex) {
5300 //invalid target type - propagate exception outwards or report error
5301 //depending on the current check context
5302 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5303 return types.createErrorType(site);
5304 } catch (Resolve.InapplicableMethodException ex) {
5305 final JCDiagnostic diag = ex.getDiagnostic();
5306 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5307 @Override
5308 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5309 return new Pair<>(sym, diag);
5310 }
5311 };
5312 List<Type> argtypes2 = argtypes.map(
5313 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5314 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5315 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5316 log.report(errDiag);
5317 return types.createErrorType(site);
5318 }
5319 }
5320
5321 public void visitLiteral(JCLiteral tree) {
5322 result = check(tree, litType(tree.typetag).constType(tree.value),
5323 KindSelector.VAL, resultInfo);
5324 }
5325 //where
5326 /** Return the type of a literal with given type tag.
5327 */
5328 Type litType(TypeTag tag) {
5329 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5330 }
5331
5332 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5333 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5334 }
5335
5336 public void visitTypeArray(JCArrayTypeTree tree) {
5337 Type etype = attribType(tree.elemtype, env);
5338 Type type = new ArrayType(etype, syms.arrayClass);
5339 result = check(tree, type, KindSelector.TYP, resultInfo);
5340 }
5341
5342 /** Visitor method for parameterized types.
5343 * Bound checking is left until later, since types are attributed
5344 * before supertype structure is completely known
5345 */
5346 public void visitTypeApply(JCTypeApply tree) {
5347 Type owntype = types.createErrorType(tree.type);
5348
5349 // Attribute functor part of application and make sure it's a class.
5350 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5351
5352 // Attribute type parameters
5353 List<Type> actuals = attribTypes(tree.arguments, env);
5354
5355 if (clazztype.hasTag(CLASS)) {
5356 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5357 if (actuals.isEmpty()) //diamond
5358 actuals = formals;
5359
5360 if (actuals.length() == formals.length()) {
5361 List<Type> a = actuals;
5362 List<Type> f = formals;
5363 while (a.nonEmpty()) {
5364 a.head = a.head.withTypeVar(f.head);
5365 a = a.tail;
5366 f = f.tail;
5367 }
5368 // Compute the proper generic outer
5369 Type clazzOuter = clazztype.getEnclosingType();
5370 if (clazzOuter.hasTag(CLASS)) {
5371 Type site;
5372 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5373 if (clazz.hasTag(IDENT)) {
5374 site = env.enclClass.sym.type;
5375 } else if (clazz.hasTag(SELECT)) {
5376 site = ((JCFieldAccess) clazz).selected.type;
5377 } else throw new AssertionError(""+tree);
5378 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5379 if (site.hasTag(CLASS) || site.hasTag(TYPEVAR))
5380 site = types.asEnclosingSuper(site, clazzOuter.tsym);
5381 if (site == null)
5382 site = types.erasure(clazzOuter);
5383 clazzOuter = site;
5384 }
5385 }
5386 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5387 clazztype.getMetadata());
5388 } else {
5389 if (formals.length() != 0) {
5390 log.error(tree.pos(),
5391 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5392 } else {
5393 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5394 }
5395 owntype = types.createErrorType(tree.type);
5396 }
5397 } else if (clazztype.hasTag(ERROR)) {
5398 ErrorType parameterizedErroneous =
5399 new ErrorType(clazztype.getOriginalType(),
5400 clazztype.tsym,
5401 clazztype.getMetadata());
5402
5403 parameterizedErroneous.typarams_field = actuals;
5404 owntype = parameterizedErroneous;
5405 }
5406 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5407 }
5408
5409 public void visitTypeUnion(JCTypeUnion tree) {
5410 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5411 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5412 for (JCExpression typeTree : tree.alternatives) {
5413 Type ctype = attribType(typeTree, env);
5414 ctype = chk.checkType(typeTree.pos(),
5415 chk.checkClassType(typeTree.pos(), ctype),
5416 syms.throwableType);
5417 if (!ctype.isErroneous()) {
5418 //check that alternatives of a union type are pairwise
5419 //unrelated w.r.t. subtyping
5420 if (chk.intersects(ctype, multicatchTypes.toList())) {
5421 for (Type t : multicatchTypes) {
5422 boolean sub = types.isSubtype(ctype, t);
5423 boolean sup = types.isSubtype(t, ctype);
5424 if (sub || sup) {
5425 //assume 'a' <: 'b'
5426 Type a = sub ? ctype : t;
5427 Type b = sub ? t : ctype;
5428 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5429 }
5430 }
5431 }
5432 multicatchTypes.append(ctype);
5433 if (all_multicatchTypes != null)
5434 all_multicatchTypes.append(ctype);
5435 } else {
5436 if (all_multicatchTypes == null) {
5437 all_multicatchTypes = new ListBuffer<>();
5438 all_multicatchTypes.appendList(multicatchTypes);
5439 }
5440 all_multicatchTypes.append(ctype);
5441 }
5442 }
5443 Type t = check(tree, types.lub(multicatchTypes.toList()),
5444 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5445 if (t.hasTag(CLASS)) {
5446 List<Type> alternatives =
5447 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5448 t = new UnionClassType((ClassType) t, alternatives);
5449 }
5450 tree.type = result = t;
5451 }
5452
5453 public void visitTypeIntersection(JCTypeIntersection tree) {
5454 attribTypes(tree.bounds, env);
5455 tree.type = result = checkIntersection(tree, tree.bounds);
5456 }
5457
5458 public void visitTypeParameter(JCTypeParameter tree) {
5459 TypeVar typeVar = (TypeVar) tree.type;
5460
5461 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5462 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5463 }
5464
5465 if (!typeVar.getUpperBound().isErroneous()) {
5466 //fixup type-parameter bound computed in 'attribTypeVariables'
5467 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5468 }
5469 }
5470
5471 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5472 Set<Symbol> boundSet = new HashSet<>();
5473 if (bounds.nonEmpty()) {
5474 // accept class or interface or typevar as first bound.
5475 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5476 boundSet.add(types.erasure(bounds.head.type).tsym);
5477 if (bounds.head.type.isErroneous()) {
5478 return bounds.head.type;
5479 }
5480 else if (bounds.head.type.hasTag(TYPEVAR)) {
5481 // if first bound was a typevar, do not accept further bounds.
5482 if (bounds.tail.nonEmpty()) {
5483 log.error(bounds.tail.head.pos(),
5484 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5485 return bounds.head.type;
5486 }
5487 } else {
5488 // if first bound was a class or interface, accept only interfaces
5489 // as further bounds.
5490 for (JCExpression bound : bounds.tail) {
5491 bound.type = checkBase(bound.type, bound, env, false, true, false);
5492 if (bound.type.isErroneous()) {
5493 bounds = List.of(bound);
5494 }
5495 else if (bound.type.hasTag(CLASS)) {
5496 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5497 }
5498 }
5499 }
5500 }
5501
5502 if (bounds.length() == 0) {
5503 return syms.objectType;
5504 } else if (bounds.length() == 1) {
5505 return bounds.head.type;
5506 } else {
5507 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5508 // ... the variable's bound is a class type flagged COMPOUND
5509 // (see comment for TypeVar.bound).
5510 // In this case, generate a class tree that represents the
5511 // bound class, ...
5512 JCExpression extending;
5513 List<JCExpression> implementing;
5514 if (!bounds.head.type.isInterface()) {
5515 extending = bounds.head;
5516 implementing = bounds.tail;
5517 } else {
5518 extending = null;
5519 implementing = bounds;
5520 }
5521 JCClassDecl cd = make.at(tree).ClassDef(
5522 make.Modifiers(PUBLIC | ABSTRACT),
5523 names.empty, List.nil(),
5524 extending, implementing, List.nil());
5525
5526 ClassSymbol c = (ClassSymbol)owntype.tsym;
5527 Assert.check((c.flags() & COMPOUND) != 0);
5528 cd.sym = c;
5529 c.sourcefile = env.toplevel.sourcefile;
5530
5531 // ... and attribute the bound class
5532 c.flags_field |= UNATTRIBUTED;
5533 Env<AttrContext> cenv = enter.classEnv(cd, env);
5534 typeEnvs.put(c, cenv);
5535 attribClass(c);
5536 return owntype;
5537 }
5538 }
5539
5540 public void visitWildcard(JCWildcard tree) {
5541 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5542 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5543 ? syms.objectType
5544 : attribType(tree.inner, env);
5545 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5546 tree.kind.kind,
5547 syms.boundClass),
5548 KindSelector.TYP, resultInfo);
5549 }
5550
5551 public void visitAnnotation(JCAnnotation tree) {
5552 Assert.error("should be handled in annotate");
5553 }
5554
5555 @Override
5556 public void visitModifiers(JCModifiers tree) {
5557 //error recovery only:
5558 Assert.check(resultInfo.pkind == KindSelector.ERR);
5559
5560 attribAnnotationTypes(tree.annotations, env);
5561 }
5562
5563 public void visitAnnotatedType(JCAnnotatedType tree) {
5564 attribAnnotationTypes(tree.annotations, env);
5565 Type underlyingType = attribType(tree.underlyingType, env);
5566 Type annotatedType = underlyingType.preannotatedType();
5567
5568 if (!env.info.isAnonymousNewClass)
5569 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5570 result = tree.type = annotatedType;
5571 }
5572
5573 public void visitErroneous(JCErroneous tree) {
5574 if (tree.errs != null) {
5575 WriteableScope newScope = env.info.scope;
5576
5577 if (env.tree instanceof JCClassDecl) {
5578 Symbol fakeOwner =
5579 new MethodSymbol(BLOCK, names.empty, null,
5580 env.info.scope.owner);
5581 newScope = newScope.dupUnshared(fakeOwner);
5582 }
5583
5584 Env<AttrContext> errEnv =
5585 env.dup(env.tree,
5586 env.info.dup(newScope));
5587 errEnv.info.returnResult = unknownExprInfo;
5588 for (JCTree err : tree.errs)
5589 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5590 }
5591 result = tree.type = syms.errType;
5592 }
5593
5594 /** Default visitor method for all other trees.
5595 */
5596 public void visitTree(JCTree tree) {
5597 throw new AssertionError();
5598 }
5599
5600 /**
5601 * Attribute an env for either a top level tree or class or module declaration.
5602 */
5603 public void attrib(Env<AttrContext> env) {
5604 switch (env.tree.getTag()) {
5605 case MODULEDEF:
5606 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5607 break;
5608 case PACKAGEDEF:
5609 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5610 break;
5611 default:
5612 attribClass(env.tree.pos(), env.enclClass.sym);
5613 }
5614
5615 annotate.flush();
5616
5617 // Now that this tree is attributed, we can calculate the Lint configuration everywhere within it
5618 lintMapper.calculateLints(env.toplevel.sourcefile, env.tree, env.toplevel.endPositions);
5619 }
5620
5621 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5622 try {
5623 annotate.flush();
5624 attribPackage(p);
5625 } catch (CompletionFailure ex) {
5626 chk.completionError(pos, ex);
5627 }
5628 }
5629
5630 void attribPackage(PackageSymbol p) {
5631 attribWithLint(p,
5632 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5633 }
5634
5635 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5636 try {
5637 annotate.flush();
5638 attribModule(m);
5639 } catch (CompletionFailure ex) {
5640 chk.completionError(pos, ex);
5641 }
5642 }
5643
5644 void attribModule(ModuleSymbol m) {
5645 attribWithLint(m, env -> attribStat(env.tree, env));
5646 }
5647
5648 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5649 Env<AttrContext> env = typeEnvs.get(sym);
5650
5651 Env<AttrContext> lintEnv = env;
5652 while (lintEnv.info.lint == null)
5653 lintEnv = lintEnv.next;
5654
5655 Lint lint = lintEnv.info.lint.augment(sym);
5656
5657 Lint prevLint = chk.setLint(lint);
5658 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5659
5660 try {
5661 attrib.accept(env);
5662 } finally {
5663 log.useSource(prev);
5664 chk.setLint(prevLint);
5665 }
5666 }
5667
5668 /** Main method: attribute class definition associated with given class symbol.
5669 * reporting completion failures at the given position.
5670 * @param pos The source position at which completion errors are to be
5671 * reported.
5672 * @param c The class symbol whose definition will be attributed.
5673 */
5674 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5675 try {
5676 annotate.flush();
5677 attribClass(c);
5678 } catch (CompletionFailure ex) {
5679 chk.completionError(pos, ex);
5680 }
5681 }
5682
5683 /** Attribute class definition associated with given class symbol.
5684 * @param c The class symbol whose definition will be attributed.
5685 */
5686 void attribClass(ClassSymbol c) throws CompletionFailure {
5687 if (c.type.hasTag(ERROR)) return;
5688
5689 // Check for cycles in the inheritance graph, which can arise from
5690 // ill-formed class files.
5691 chk.checkNonCyclic(null, c.type);
5692
5693 Type st = types.supertype(c.type);
5694 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5695 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5696 // First, attribute superclass.
5697 if (st.hasTag(CLASS))
5698 attribClass((ClassSymbol)st.tsym);
5699
5700 // Next attribute owner, if it is a class.
5701 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5702 attribClass((ClassSymbol)c.owner);
5703
5704 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5705 }
5706
5707 // The previous operations might have attributed the current class
5708 // if there was a cycle. So we test first whether the class is still
5709 // UNATTRIBUTED.
5710 if ((c.flags_field & UNATTRIBUTED) != 0) {
5711 c.flags_field &= ~UNATTRIBUTED;
5712
5713 // Get environment current at the point of class definition.
5714 Env<AttrContext> env = typeEnvs.get(c);
5715
5716 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5717 // because the annotations were not available at the time the env was created. Therefore,
5718 // we look up the environment chain for the first enclosing environment for which the
5719 // lint value is set. Typically, this is the parent env, but might be further if there
5720 // are any envs created as a result of TypeParameter nodes.
5721 Env<AttrContext> lintEnv = env;
5722 while (lintEnv.info.lint == null)
5723 lintEnv = lintEnv.next;
5724
5725 // Having found the enclosing lint value, we can initialize the lint value for this class
5726 env.info.lint = lintEnv.info.lint.augment(c);
5727
5728 Lint prevLint = chk.setLint(env.info.lint);
5729 JavaFileObject prev = log.useSource(c.sourcefile);
5730 ResultInfo prevReturnRes = env.info.returnResult;
5731
5732 try {
5733 if (c.isSealed() &&
5734 !c.isEnum() &&
5735 !c.isPermittedExplicit &&
5736 c.getPermittedSubclasses().isEmpty()) {
5737 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5738 }
5739
5740 if (c.isSealed()) {
5741 Set<Symbol> permittedTypes = new HashSet<>();
5742 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5743 for (Type subType : c.getPermittedSubclasses()) {
5744 if (subType.isErroneous()) {
5745 // the type already caused errors, don't produce more potentially misleading errors
5746 continue;
5747 }
5748 boolean isTypeVar = false;
5749 if (subType.getTag() == TYPEVAR) {
5750 isTypeVar = true; //error recovery
5751 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5752 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5753 }
5754 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5755 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5756 }
5757 if (permittedTypes.contains(subType.tsym)) {
5758 DiagnosticPosition pos =
5759 env.enclClass.permitting.stream()
5760 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5761 .limit(2).collect(List.collector()).get(1);
5762 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5763 } else {
5764 permittedTypes.add(subType.tsym);
5765 }
5766 if (sealedInUnnamed) {
5767 if (subType.tsym.packge() != c.packge()) {
5768 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5769 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5770 );
5771 }
5772 } else if (subType.tsym.packge().modle != c.packge().modle) {
5773 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5774 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5775 );
5776 }
5777 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5778 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5779 Errors.InvalidPermitsClause(
5780 subType.tsym == c.type.tsym ?
5781 Fragments.MustNotBeSameClass :
5782 Fragments.MustNotBeSupertype(subType)
5783 )
5784 );
5785 } else if (!isTypeVar) {
5786 boolean thisIsASuper = types.directSupertypes(subType)
5787 .stream()
5788 .anyMatch(d -> d.tsym == c);
5789 if (!thisIsASuper) {
5790 if(c.isInterface()) {
5791 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5792 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5793 } else {
5794 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5795 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5796 }
5797 }
5798 }
5799 }
5800 }
5801
5802 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5803 .stream()
5804 .filter(s -> s.tsym.isSealed())
5805 .map(s -> (ClassSymbol) s.tsym)
5806 .collect(List.collector());
5807
5808 if (sealedSupers.isEmpty()) {
5809 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5810 boolean hasErrorSuper = false;
5811
5812 hasErrorSuper |= types.directSupertypes(c.type)
5813 .stream()
5814 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5815
5816 ClassType ct = (ClassType) c.type;
5817
5818 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5819
5820 if (!hasErrorSuper) {
5821 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5822 }
5823 }
5824 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5825 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5826 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5827 }
5828
5829 if (!c.type.isCompound()) {
5830 for (ClassSymbol supertypeSym : sealedSupers) {
5831 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5832 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5833 }
5834 }
5835 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5836 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5837 c.isInterface() ?
5838 Errors.NonSealedOrSealedExpected :
5839 Errors.NonSealedSealedOrFinalExpected);
5840 }
5841 }
5842 }
5843
5844 env.info.returnResult = null;
5845 // java.lang.Enum may not be subclassed by a non-enum
5846 if (st.tsym == syms.enumSym &&
5847 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5848 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5849
5850 // Enums may not be extended by source-level classes
5851 if (st.tsym != null &&
5852 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5853 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5854 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5855 }
5856
5857 if (rs.isSerializable(c.type)) {
5858 env.info.isSerializable = true;
5859 }
5860
5861 if (c.isValueClass()) {
5862 Assert.check(env.tree.hasTag(CLASSDEF));
5863 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5864 }
5865
5866 attribClassBody(env, c);
5867
5868 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5869 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5870 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5871 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5872
5873 if (c.isImplicit()) {
5874 chk.checkHasMain(env.tree.pos(), c);
5875 }
5876 } finally {
5877 env.info.returnResult = prevReturnRes;
5878 log.useSource(prev);
5879 chk.setLint(prevLint);
5880 }
5881
5882 }
5883 }
5884
5885 public void visitImport(JCImport tree) {
5886 // nothing to do
5887 }
5888
5889 public void visitModuleDef(JCModuleDecl tree) {
5890 tree.sym.completeUsesProvides();
5891 ModuleSymbol msym = tree.sym;
5892 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5893 Lint prevLint = chk.setLint(lint);
5894 try {
5895 chk.checkModuleName(tree);
5896 chk.checkDeprecatedAnnotation(tree, msym);
5897 } finally {
5898 chk.setLint(prevLint);
5899 }
5900 }
5901
5902 /** Finish the attribution of a class. */
5903 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5904 JCClassDecl tree = (JCClassDecl)env.tree;
5905 Assert.check(c == tree.sym);
5906
5907 // Validate type parameters, supertype and interfaces.
5908 attribStats(tree.typarams, env);
5909 if (!c.isAnonymous()) {
5910 //already checked if anonymous
5911 chk.validate(tree.typarams, env);
5912 chk.validate(tree.extending, env);
5913 chk.validate(tree.implementing, env);
5914 }
5915
5916 chk.checkRequiresIdentity(tree, env.info.lint);
5917
5918 c.markAbstractIfNeeded(types);
5919
5920 // If this is a non-abstract class, check that it has no abstract
5921 // methods or unimplemented methods of an implemented interface.
5922 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5923 chk.checkAllDefined(tree.pos(), c);
5924 }
5925
5926 if ((c.flags() & ANNOTATION) != 0) {
5927 if (tree.implementing.nonEmpty())
5928 log.error(tree.implementing.head.pos(),
5929 Errors.CantExtendIntfAnnotation);
5930 if (tree.typarams.nonEmpty()) {
5931 log.error(tree.typarams.head.pos(),
5932 Errors.IntfAnnotationCantHaveTypeParams(c));
5933 }
5934
5935 // If this annotation type has a @Repeatable, validate
5936 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5937 // If this annotation type has a @Repeatable, validate
5938 if (repeatable != null) {
5939 // get diagnostic position for error reporting
5940 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5941 Assert.checkNonNull(cbPos);
5942
5943 chk.validateRepeatable(c, repeatable, cbPos);
5944 }
5945 } else {
5946 // Check that all extended classes and interfaces
5947 // are compatible (i.e. no two define methods with same arguments
5948 // yet different return types). (JLS 8.4.8.3)
5949 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5950 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5951 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5952 }
5953
5954 // Check that class does not import the same parameterized interface
5955 // with two different argument lists.
5956 chk.checkClassBounds(tree.pos(), c.type);
5957
5958 tree.type = c.type;
5959
5960 for (List<JCTypeParameter> l = tree.typarams;
5961 l.nonEmpty(); l = l.tail) {
5962 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5963 }
5964
5965 // Check that a generic class doesn't extend Throwable
5966 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5967 log.error(tree.extending.pos(), Errors.GenericThrowable);
5968
5969 // Check that all methods which implement some
5970 // method conform to the method they implement.
5971 chk.checkImplementations(tree);
5972
5973 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5974 checkAutoCloseable(tree.pos(), env, c.type);
5975
5976 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5977 // Attribute declaration
5978 attribStat(l.head, env);
5979 // Check that declarations in inner classes are not static (JLS 8.1.2)
5980 // Make an exception for static constants.
5981 if (!allowRecords &&
5982 c.owner.kind != PCK &&
5983 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5984 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5985 VarSymbol sym = null;
5986 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5987 if (sym == null ||
5988 sym.kind != VAR ||
5989 sym.getConstValue() == null)
5990 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5991 }
5992 }
5993
5994 // Check for proper placement of super()/this() calls.
5995 chk.checkSuperInitCalls(tree);
5996
5997 // Check for cycles among non-initial constructors.
5998 chk.checkCyclicConstructors(tree);
5999
6000 // Check for cycles among annotation elements.
6001 chk.checkNonCyclicElements(tree);
6002
6003 // Check for proper use of serialVersionUID and other
6004 // serialization-related fields and methods
6005 if (env.info.lint.isEnabled(LintCategory.SERIAL)
6006 && rs.isSerializable(c.type)
6007 && !c.isAnonymous()) {
6008 chk.checkSerialStructure(env, tree, c);
6009 }
6010 // Correctly organize the positions of the type annotations
6011 typeAnnotations.organizeTypeAnnotationsBodies(tree);
6012
6013 // Check type annotations applicability rules
6014 validateTypeAnnotations(tree, false);
6015 }
6016 // where
6017 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
6018 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
6019 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
6020 if (types.isSameType(al.head.annotationType.type, t))
6021 return al.head.pos();
6022 }
6023
6024 return null;
6025 }
6026
6027 private Type capture(Type type) {
6028 return types.capture(type);
6029 }
6030
6031 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
6032 if (type.isErroneous()) {
6033 tree.vartype = make.at(tree.pos()).Erroneous();
6034 } else {
6035 tree.vartype = make.at(tree.pos()).Type(type);
6036 }
6037 }
6038
6039 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
6040 tree.accept(new TypeAnnotationsValidator(sigOnly));
6041 }
6042 //where
6043 private final class TypeAnnotationsValidator extends TreeScanner {
6044
6045 private final boolean sigOnly;
6046 public TypeAnnotationsValidator(boolean sigOnly) {
6047 this.sigOnly = sigOnly;
6048 }
6049
6050 public void visitAnnotation(JCAnnotation tree) {
6051 chk.validateTypeAnnotation(tree, null, false);
6052 super.visitAnnotation(tree);
6053 }
6054 public void visitAnnotatedType(JCAnnotatedType tree) {
6055 if (!tree.underlyingType.type.isErroneous()) {
6056 super.visitAnnotatedType(tree);
6057 }
6058 }
6059 public void visitTypeParameter(JCTypeParameter tree) {
6060 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
6061 scan(tree.bounds);
6062 // Don't call super.
6063 // This is needed because above we call validateTypeAnnotation with
6064 // false, which would forbid annotations on type parameters.
6065 // super.visitTypeParameter(tree);
6066 }
6067 public void visitMethodDef(JCMethodDecl tree) {
6068 if (tree.recvparam != null &&
6069 !tree.recvparam.vartype.type.isErroneous()) {
6070 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
6071 }
6072 if (tree.restype != null && tree.restype.type != null) {
6073 validateAnnotatedType(tree.restype, tree.restype.type);
6074 }
6075 if (sigOnly) {
6076 scan(tree.mods);
6077 scan(tree.restype);
6078 scan(tree.typarams);
6079 scan(tree.recvparam);
6080 scan(tree.params);
6081 scan(tree.thrown);
6082 } else {
6083 scan(tree.defaultValue);
6084 scan(tree.body);
6085 }
6086 }
6087 public void visitVarDef(final JCVariableDecl tree) {
6088 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
6089 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
6090 validateAnnotatedType(tree.vartype, tree.sym.type);
6091 scan(tree.mods);
6092 scan(tree.vartype);
6093 if (!sigOnly) {
6094 scan(tree.init);
6095 }
6096 }
6097 public void visitTypeCast(JCTypeCast tree) {
6098 if (tree.clazz != null && tree.clazz.type != null)
6099 validateAnnotatedType(tree.clazz, tree.clazz.type);
6100 super.visitTypeCast(tree);
6101 }
6102 public void visitTypeTest(JCInstanceOf tree) {
6103 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
6104 validateAnnotatedType(tree.pattern, tree.pattern.type);
6105 super.visitTypeTest(tree);
6106 }
6107 public void visitNewClass(JCNewClass tree) {
6108 if (tree.clazz != null && tree.clazz.type != null) {
6109 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
6110 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
6111 tree.clazz.type.tsym);
6112 }
6113 if (tree.def != null) {
6114 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
6115 }
6116
6117 validateAnnotatedType(tree.clazz, tree.clazz.type);
6118 }
6119 super.visitNewClass(tree);
6120 }
6121 public void visitNewArray(JCNewArray tree) {
6122 if (tree.elemtype != null && tree.elemtype.type != null) {
6123 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
6124 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
6125 tree.elemtype.type.tsym);
6126 }
6127 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
6128 }
6129 super.visitNewArray(tree);
6130 }
6131 public void visitClassDef(JCClassDecl tree) {
6132 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
6133 if (sigOnly) {
6134 scan(tree.mods);
6135 scan(tree.typarams);
6136 scan(tree.extending);
6137 scan(tree.implementing);
6138 }
6139 for (JCTree member : tree.defs) {
6140 if (member.hasTag(Tag.CLASSDEF)) {
6141 continue;
6142 }
6143 scan(member);
6144 }
6145 }
6146 public void visitBlock(JCBlock tree) {
6147 if (!sigOnly) {
6148 scan(tree.stats);
6149 }
6150 }
6151
6152 /* I would want to model this after
6153 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
6154 * and override visitSelect and visitTypeApply.
6155 * However, we only set the annotated type in the top-level type
6156 * of the symbol.
6157 * Therefore, we need to override each individual location where a type
6158 * can occur.
6159 */
6160 private void validateAnnotatedType(final JCTree errtree, final Type type) {
6161 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
6162
6163 if (type.isPrimitiveOrVoid()) {
6164 return;
6165 }
6166
6167 JCTree enclTr = errtree;
6168 Type enclTy = type;
6169
6170 boolean repeat = true;
6171 while (repeat) {
6172 if (enclTr.hasTag(TYPEAPPLY)) {
6173 List<Type> tyargs = enclTy.getTypeArguments();
6174 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
6175 if (trargs.length() > 0) {
6176 // Nothing to do for diamonds
6177 if (tyargs.length() == trargs.length()) {
6178 for (int i = 0; i < tyargs.length(); ++i) {
6179 validateAnnotatedType(trargs.get(i), tyargs.get(i));
6180 }
6181 }
6182 // If the lengths don't match, it's either a diamond
6183 // or some nested type that redundantly provides
6184 // type arguments in the tree.
6185 }
6186
6187 // Look at the clazz part of a generic type
6188 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
6189 }
6190
6191 if (enclTr.hasTag(SELECT)) {
6192 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
6193 if (enclTy != null &&
6194 !enclTy.hasTag(NONE)) {
6195 enclTy = enclTy.getEnclosingType();
6196 }
6197 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
6198 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
6199 if (enclTy == null || enclTy.hasTag(NONE)) {
6200 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
6201 for (JCAnnotation an : at.getAnnotations()) {
6202 if (chk.isTypeAnnotation(an, false)) {
6203 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
6204 }
6205 }
6206 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
6207 if (!onlyTypeAnnotations.isEmpty()) {
6208 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
6209 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
6210 Fragments.TypeAnnotation(onlyTypeAnnotations);
6211 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
6212 type.stripMetadata().annotatedType(onlyTypeAnnotations));
6213 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
6214 type.tsym.owner, annotatedType));
6215 }
6216 repeat = false;
6217 }
6218 enclTr = at.underlyingType;
6219 // enclTy doesn't need to be changed
6220 } else if (enclTr.hasTag(IDENT)) {
6221 repeat = false;
6222 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6223 JCWildcard wc = (JCWildcard) enclTr;
6224 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6225 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6226 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6227 } else {
6228 // Nothing to do for UNBOUND
6229 }
6230 repeat = false;
6231 } else if (enclTr.hasTag(TYPEARRAY)) {
6232 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6233 validateAnnotatedType(art.getType(), art.elemtype.type);
6234 repeat = false;
6235 } else if (enclTr.hasTag(TYPEUNION)) {
6236 JCTypeUnion ut = (JCTypeUnion) enclTr;
6237 for (JCTree t : ut.getTypeAlternatives()) {
6238 validateAnnotatedType(t, t.type);
6239 }
6240 repeat = false;
6241 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6242 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6243 for (JCTree t : it.getBounds()) {
6244 validateAnnotatedType(t, t.type);
6245 }
6246 repeat = false;
6247 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6248 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6249 repeat = false;
6250 } else {
6251 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6252 " within: "+ errtree + " with kind: " + errtree.getKind());
6253 }
6254 }
6255 }
6256
6257 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6258 Symbol sym) {
6259 // Ensure that no declaration annotations are present.
6260 // Note that a tree type might be an AnnotatedType with
6261 // empty annotations, if only declaration annotations were given.
6262 // This method will raise an error for such a type.
6263 for (JCAnnotation ai : annotations) {
6264 if (!ai.type.isErroneous() &&
6265 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6266 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6267 }
6268 }
6269 }
6270 }
6271
6272 // <editor-fold desc="post-attribution visitor">
6273
6274 /**
6275 * Handle missing types/symbols in an AST. This routine is useful when
6276 * the compiler has encountered some errors (which might have ended up
6277 * terminating attribution abruptly); if the compiler is used in fail-over
6278 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6279 * prevents NPE to be propagated during subsequent compilation steps.
6280 */
6281 public void postAttr(JCTree tree) {
6282 new PostAttrAnalyzer().scan(tree);
6283 }
6284
6285 class PostAttrAnalyzer extends TreeScanner {
6286
6287 private void initTypeIfNeeded(JCTree that) {
6288 if (that.type == null) {
6289 if (that.hasTag(METHODDEF)) {
6290 that.type = dummyMethodType((JCMethodDecl)that);
6291 } else {
6292 that.type = syms.unknownType;
6293 }
6294 }
6295 }
6296
6297 /* Construct a dummy method type. If we have a method declaration,
6298 * and the declared return type is void, then use that return type
6299 * instead of UNKNOWN to avoid spurious error messages in lambda
6300 * bodies (see:JDK-8041704).
6301 */
6302 private Type dummyMethodType(JCMethodDecl md) {
6303 Type restype = syms.unknownType;
6304 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6305 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6306 if (prim.typetag == VOID)
6307 restype = syms.voidType;
6308 }
6309 return new MethodType(List.nil(), restype,
6310 List.nil(), syms.methodClass);
6311 }
6312 private Type dummyMethodType() {
6313 return dummyMethodType(null);
6314 }
6315
6316 @Override
6317 public void scan(JCTree tree) {
6318 if (tree == null) return;
6319 if (tree instanceof JCExpression) {
6320 initTypeIfNeeded(tree);
6321 }
6322 super.scan(tree);
6323 }
6324
6325 @Override
6326 public void visitIdent(JCIdent that) {
6327 if (that.sym == null) {
6328 that.sym = syms.unknownSymbol;
6329 }
6330 }
6331
6332 @Override
6333 public void visitSelect(JCFieldAccess that) {
6334 if (that.sym == null) {
6335 that.sym = syms.unknownSymbol;
6336 }
6337 super.visitSelect(that);
6338 }
6339
6340 @Override
6341 public void visitClassDef(JCClassDecl that) {
6342 initTypeIfNeeded(that);
6343 if (that.sym == null) {
6344 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6345 }
6346 super.visitClassDef(that);
6347 }
6348
6349 @Override
6350 public void visitMethodDef(JCMethodDecl that) {
6351 initTypeIfNeeded(that);
6352 if (that.sym == null) {
6353 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6354 }
6355 super.visitMethodDef(that);
6356 }
6357
6358 @Override
6359 public void visitVarDef(JCVariableDecl that) {
6360 initTypeIfNeeded(that);
6361 if (that.sym == null) {
6362 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6363 that.sym.adr = 0;
6364 }
6365 if (that.vartype == null) {
6366 that.vartype = make.at(Position.NOPOS).Erroneous();
6367 }
6368 super.visitVarDef(that);
6369 }
6370
6371 @Override
6372 public void visitBindingPattern(JCBindingPattern that) {
6373 initTypeIfNeeded(that);
6374 initTypeIfNeeded(that.var);
6375 if (that.var.sym == null) {
6376 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6377 that.var.sym.adr = 0;
6378 }
6379 super.visitBindingPattern(that);
6380 }
6381
6382 @Override
6383 public void visitRecordPattern(JCRecordPattern that) {
6384 initTypeIfNeeded(that);
6385 if (that.record == null) {
6386 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6387 that.type, syms.noSymbol);
6388 }
6389 if (that.fullComponentTypes == null) {
6390 that.fullComponentTypes = List.nil();
6391 }
6392 super.visitRecordPattern(that);
6393 }
6394
6395 @Override
6396 public void visitNewClass(JCNewClass that) {
6397 if (that.constructor == null) {
6398 that.constructor = new MethodSymbol(0, names.init,
6399 dummyMethodType(), syms.noSymbol);
6400 }
6401 if (that.constructorType == null) {
6402 that.constructorType = syms.unknownType;
6403 }
6404 super.visitNewClass(that);
6405 }
6406
6407 @Override
6408 public void visitAssignop(JCAssignOp that) {
6409 if (that.operator == null) {
6410 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6411 -1, syms.noSymbol);
6412 }
6413 super.visitAssignop(that);
6414 }
6415
6416 @Override
6417 public void visitBinary(JCBinary that) {
6418 if (that.operator == null) {
6419 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6420 -1, syms.noSymbol);
6421 }
6422 super.visitBinary(that);
6423 }
6424
6425 @Override
6426 public void visitUnary(JCUnary that) {
6427 if (that.operator == null) {
6428 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6429 -1, syms.noSymbol);
6430 }
6431 super.visitUnary(that);
6432 }
6433
6434 @Override
6435 public void visitReference(JCMemberReference that) {
6436 super.visitReference(that);
6437 if (that.sym == null) {
6438 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6439 syms.noSymbol);
6440 }
6441 }
6442 }
6443 // </editor-fold>
6444
6445 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6446 new TreeScanner() {
6447 Symbol packge = pkg;
6448 @Override
6449 public void visitIdent(JCIdent that) {
6450 that.sym = packge;
6451 }
6452
6453 @Override
6454 public void visitSelect(JCFieldAccess that) {
6455 that.sym = packge;
6456 packge = packge.owner;
6457 super.visitSelect(that);
6458 }
6459 }.scan(pid);
6460 }
6461
6462 }