1 /*
2 * Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.function.Function;
32 import java.util.stream.Stream;
33
34 import javax.lang.model.element.ElementKind;
35 import javax.tools.JavaFileObject;
36
37 import com.sun.source.tree.CaseTree;
38 import com.sun.source.tree.IdentifierTree;
39 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
40 import com.sun.source.tree.MemberSelectTree;
41 import com.sun.source.tree.TreeVisitor;
42 import com.sun.source.util.SimpleTreeVisitor;
43 import com.sun.tools.javac.code.*;
44 import com.sun.tools.javac.code.Lint.LintCategory;
45 import com.sun.tools.javac.code.LintMapper;
46 import com.sun.tools.javac.code.Scope.WriteableScope;
47 import com.sun.tools.javac.code.Source.Feature;
48 import com.sun.tools.javac.code.Symbol.*;
49 import com.sun.tools.javac.code.Type.*;
50 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
51 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
52 import com.sun.tools.javac.comp.Check.CheckContext;
53 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
54 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
55 import com.sun.tools.javac.jvm.*;
56
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
59 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
60
61 import com.sun.tools.javac.resources.CompilerProperties.Errors;
62 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
63 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
64 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
65 import com.sun.tools.javac.tree.*;
66 import com.sun.tools.javac.tree.JCTree.*;
67 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
68 import com.sun.tools.javac.util.*;
69 import com.sun.tools.javac.util.DefinedBy.Api;
70 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
71 import com.sun.tools.javac.util.JCDiagnostic.Error;
72 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
73 import com.sun.tools.javac.util.JCDiagnostic.Warning;
74 import com.sun.tools.javac.util.List;
75
76 import static com.sun.tools.javac.code.Flags.*;
77 import static com.sun.tools.javac.code.Flags.ANNOTATION;
78 import static com.sun.tools.javac.code.Flags.BLOCK;
79 import static com.sun.tools.javac.code.Kinds.*;
80 import static com.sun.tools.javac.code.Kinds.Kind.*;
81 import static com.sun.tools.javac.code.TypeTag.*;
82 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
83 import static com.sun.tools.javac.tree.JCTree.Tag.*;
84
85 /** This is the main context-dependent analysis phase in GJC. It
86 * encompasses name resolution, type checking and constant folding as
87 * subtasks. Some subtasks involve auxiliary classes.
88 * @see Check
89 * @see Resolve
90 * @see ConstFold
91 * @see Infer
92 *
93 * <p><b>This is NOT part of any supported API.
94 * If you write code that depends on this, you do so at your own risk.
95 * This code and its internal interfaces are subject to change or
96 * deletion without notice.</b>
97 */
98 public class Attr extends JCTree.Visitor {
99 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
100
101 final Names names;
102 final Log log;
103 final LintMapper lintMapper;
104 final Symtab syms;
105 final Resolve rs;
106 final Operators operators;
107 final Infer infer;
108 final Analyzer analyzer;
109 final DeferredAttr deferredAttr;
110 final Check chk;
111 final Flow flow;
112 final MemberEnter memberEnter;
113 final TypeEnter typeEnter;
114 final TreeMaker make;
115 final ConstFold cfolder;
116 final Enter enter;
117 final Target target;
118 final Types types;
119 final Preview preview;
120 final JCDiagnostic.Factory diags;
121 final TypeAnnotations typeAnnotations;
122 final TypeEnvs typeEnvs;
123 final Dependencies dependencies;
124 final Annotate annotate;
125 final ArgumentAttr argumentAttr;
126 final MatchBindingsComputer matchBindingsComputer;
127 final AttrRecover attrRecover;
128 final boolean captureMRefReturnType;
129
130 public static Attr instance(Context context) {
131 Attr instance = context.get(attrKey);
132 if (instance == null)
133 instance = new Attr(context);
134 return instance;
135 }
136
137 @SuppressWarnings("this-escape")
138 protected Attr(Context context) {
139 context.put(attrKey, this);
140
141 names = Names.instance(context);
142 log = Log.instance(context);
143 lintMapper = LintMapper.instance(context);
144 syms = Symtab.instance(context);
145 rs = Resolve.instance(context);
146 operators = Operators.instance(context);
147 chk = Check.instance(context);
148 flow = Flow.instance(context);
149 memberEnter = MemberEnter.instance(context);
150 typeEnter = TypeEnter.instance(context);
151 make = TreeMaker.instance(context);
152 enter = Enter.instance(context);
153 infer = Infer.instance(context);
154 analyzer = Analyzer.instance(context);
155 deferredAttr = DeferredAttr.instance(context);
156 cfolder = ConstFold.instance(context);
157 target = Target.instance(context);
158 types = Types.instance(context);
159 preview = Preview.instance(context);
160 diags = JCDiagnostic.Factory.instance(context);
161 annotate = Annotate.instance(context);
162 typeAnnotations = TypeAnnotations.instance(context);
163 typeEnvs = TypeEnvs.instance(context);
164 dependencies = Dependencies.instance(context);
165 argumentAttr = ArgumentAttr.instance(context);
166 matchBindingsComputer = MatchBindingsComputer.instance(context);
167 attrRecover = AttrRecover.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 captureMRefReturnType = Source.Feature.CAPTURE_MREF_RETURN_TYPE.allowedInSource(source);
181
182 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
183 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
184 varAssignmentOpInfo = new ResultInfo(KindSelector.ASG_OP, Type.noType);
185 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
186 methodAttrInfo = new MethodAttrInfo();
187 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
188 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
189 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
190 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
191 allowValueClasses = preview.isEnabled() && Feature.VALUE_CLASSES.allowedInSource(source);
192 }
193
194 /** Switch: reifiable types in instanceof enabled?
195 */
196 boolean allowReifiableTypesInInstanceof;
197
198 /** Are records allowed
199 */
200 private final boolean allowRecords;
201
202 /** Are patterns in switch allowed
203 */
204 private final boolean allowPatternSwitch;
205
206 /** Are unconditional patterns in instanceof allowed
207 */
208 private final boolean allowUnconditionalPatternsInstanceOf;
209
210 /** Are value classes allowed
211 */
212 private final boolean allowValueClasses;
213
214 /**
215 * Switch: warn about use of variable before declaration?
216 * RFE: 6425594
217 */
218 boolean useBeforeDeclarationWarning;
219
220 /**
221 * Switch: name of source level; used for error reporting.
222 */
223 String sourceName;
224
225 /** Check kind and type of given tree against protokind and prototype.
226 * If check succeeds, store type in tree and return it.
227 * If check fails, store errType in tree and return it.
228 * No checks are performed if the prototype is a method type.
229 * It is not necessary in this case since we know that kind and type
230 * are correct.
231 *
232 * @param tree The tree whose kind and type is checked
233 * @param found The computed type of the tree
234 * @param ownkind The computed kind of the tree
235 * @param resultInfo The expected result of the tree
236 */
237 Type check(final JCTree tree,
238 final Type found,
239 final KindSelector ownkind,
240 final ResultInfo resultInfo) {
241 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
242 Type owntype;
243 boolean shouldCheck = !found.hasTag(ERROR) &&
244 !resultInfo.pt.hasTag(METHOD) &&
245 !resultInfo.pt.hasTag(FORALL);
246 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
247 log.error(tree.pos(),
248 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
249 ownkind.kindNames()));
250 owntype = types.createErrorType(found);
251 } else if (inferenceContext.free(found)) {
252 //delay the check if there are inference variables in the found type
253 //this means we are dealing with a partially inferred poly expression
254 owntype = shouldCheck ? resultInfo.pt : found;
255 if (resultInfo.checkMode.installPostInferenceHook()) {
256 inferenceContext.addFreeTypeListener(List.of(found),
257 instantiatedContext -> {
258 ResultInfo pendingResult =
259 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
260 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
261 });
262 }
263 } else {
264 owntype = shouldCheck ?
265 resultInfo.check(tree, found) :
266 found;
267 }
268 if (resultInfo.checkMode.updateTreeType()) {
269 tree.type = owntype;
270 }
271 return owntype;
272 }
273
274 /** Is given blank final variable assignable, i.e. in a scope where it
275 * may be assigned to even though it is final?
276 * @param v The blank final variable.
277 * @param env The current environment.
278 */
279 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
280 Symbol owner = env.info.scope.owner;
281 // owner refers to the innermost variable, method or
282 // initializer block declaration at this point.
283 boolean isAssignable =
284 v.owner == owner
285 ||
286 ((owner.name == names.init || // i.e. we are in a constructor
287 owner.kind == VAR || // i.e. we are in a variable initializer
288 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
289 &&
290 v.owner == owner.owner
291 &&
292 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
293 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
294 boolean assigningRecordField = (v.flags() & RECORD) != 0;
295 // Only record component fields are non-assignable in a compact constructor.
296 return isAssignable && (!insideCompactConstructor || !assigningRecordField);
297 }
298
299 /** Check that variable can be assigned to.
300 * @param pos The current source code position.
301 * @param v The assigned variable
302 * @param base If the variable is referred to in a Select, the part
303 * to the left of the `.', null otherwise.
304 * @param env The current environment.
305 */
306 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
307 if (v.name == names._this) {
308 log.error(pos, Errors.CantAssignValToThis);
309 return;
310 }
311 if ((v.flags() & FINAL) != 0 &&
312 ((v.flags() & HASINIT) != 0
313 ||
314 !((base == null ||
315 TreeInfo.isThisQualifier(base)) &&
316 isAssignableAsBlankFinal(v, env)))) {
317 if (v.isResourceVariable()) { //TWR resource
318 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
319 } else {
320 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
321 }
322 return;
323 }
324 }
325
326 /** Does tree represent a static reference to an identifier?
327 * It is assumed that tree is either a SELECT or an IDENT.
328 * We have to weed out selects from non-type names here.
329 * @param tree The candidate tree.
330 */
331 boolean isStaticReference(JCTree tree) {
332 if (tree.hasTag(SELECT)) {
333 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
334 if (lsym == null || lsym.kind != TYP) {
335 return false;
336 }
337 }
338 return true;
339 }
340
341 /** Is this symbol a type?
342 */
343 static boolean isType(Symbol sym) {
344 return sym != null && sym.kind == TYP;
345 }
346
347 /** Attribute a parsed identifier.
348 * @param tree Parsed identifier name
349 * @param topLevel The toplevel to use
350 */
351 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
352 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
353 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
354 syms.errSymbol.name,
355 null, null, null, null);
356 localEnv.enclClass.sym = syms.errSymbol;
357 return attribIdent(tree, localEnv);
358 }
359
360 /** Attribute a parsed identifier.
361 * @param tree Parsed identifier name
362 * @param env The env to use
363 */
364 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
365 return tree.accept(identAttributer, env);
366 }
367 // where
368 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
369 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
370 @Override @DefinedBy(Api.COMPILER_TREE)
371 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
372 Symbol site = visit(node.getExpression(), env);
373 if (site == null || site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
374 return site;
375 Name name = (Name)node.getIdentifier();
376 if (site.kind == PCK) {
377 env.toplevel.packge = (PackageSymbol)site;
378 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
379 KindSelector.TYP_PCK);
380 } else {
381 env.enclClass.sym = (ClassSymbol)site;
382 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
383 }
384 }
385
386 @Override @DefinedBy(Api.COMPILER_TREE)
387 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
388 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
389 }
390 }
391
392 public Type coerce(Type etype, Type ttype) {
393 return cfolder.coerce(etype, ttype);
394 }
395
396 public Type attribType(JCTree node, TypeSymbol sym) {
397 Env<AttrContext> env = typeEnvs.get(sym);
398 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
399 return attribTree(node, localEnv, unknownTypeInfo);
400 }
401
402 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
403 // Attribute qualifying package or class.
404 JCFieldAccess s = tree.qualid;
405 return attribTree(s.selected, env,
406 new ResultInfo(tree.staticImport ?
407 KindSelector.TYP : KindSelector.TYP_PCK,
408 Type.noType));
409 }
410
411 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
412 return attribToTree(expr, env, tree, unknownExprInfo);
413 }
414
415 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
416 return attribToTree(stmt, env, tree, statInfo);
417 }
418
419 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
420 breakTree = tree;
421 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
422 try {
423 deferredAttr.attribSpeculative(root, env, resultInfo,
424 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
425 argumentAttr.withLocalCacheContext());
426 attrRecover.doRecovery();
427 } catch (BreakAttr b) {
428 return b.env;
429 } catch (AssertionError ae) {
430 if (ae.getCause() instanceof BreakAttr breakAttr) {
431 return breakAttr.env;
432 } else {
433 throw ae;
434 }
435 } finally {
436 breakTree = null;
437 log.useSource(prev);
438 }
439 return env;
440 }
441
442 public <R> R runWithAttributedMethod(Env<AttrContext> env, JCMethodDecl tree, Function<JCBlock, R> attributedAction) {
443 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
444 try {
445 annotate.queueScanTreeAndTypeAnnotate(tree.body, env, tree.sym);
446 annotate.flush();
447 if ((env.enclClass.sym.flags_field & Flags.UNATTRIBUTED) != 0) {
448 attribClass(env.enclClass.sym);
449 }
450 return attributedAction.apply(tree.body);
451 } finally {
452 attrRecover.doRecovery();
453 log.useSource(prevSource);
454 }
455 }
456
457 private JCTree breakTree = null;
458
459 private static class BreakAttr extends RuntimeException {
460 static final long serialVersionUID = -6924771130405446405L;
461 private transient Env<AttrContext> env;
462 private BreakAttr(Env<AttrContext> env) {
463 this.env = env;
464 }
465 }
466
467 /**
468 * Mode controlling behavior of Attr.Check
469 */
470 enum CheckMode {
471
472 NORMAL,
473
474 /**
475 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
476 * that the captured var cache in {@code InferenceContext} will be used in read-only
477 * mode when performing inference checks.
478 */
479 NO_TREE_UPDATE {
480 @Override
481 public boolean updateTreeType() {
482 return false;
483 }
484 },
485 /**
486 * Mode signalling that caller will manage free types in tree decorations.
487 */
488 NO_INFERENCE_HOOK {
489 @Override
490 public boolean installPostInferenceHook() {
491 return false;
492 }
493 };
494
495 public boolean updateTreeType() {
496 return true;
497 }
498 public boolean installPostInferenceHook() {
499 return true;
500 }
501 }
502
503
504 class ResultInfo {
505 final KindSelector pkind;
506 final Type pt;
507 final CheckContext checkContext;
508 final CheckMode checkMode;
509
510 ResultInfo(KindSelector pkind, Type pt) {
511 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
512 }
513
514 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
515 this(pkind, pt, chk.basicHandler, checkMode);
516 }
517
518 protected ResultInfo(KindSelector pkind,
519 Type pt, CheckContext checkContext) {
520 this(pkind, pt, checkContext, CheckMode.NORMAL);
521 }
522
523 protected ResultInfo(KindSelector pkind,
524 Type pt, CheckContext checkContext, CheckMode checkMode) {
525 this.pkind = pkind;
526 this.pt = pt;
527 this.checkContext = checkContext;
528 this.checkMode = checkMode;
529 }
530
531 /**
532 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
533 * @param tree The tree to be type-checked.
534 * @return true if {@code ArgumentAttr} should be used.
535 */
536 protected boolean needsArgumentAttr(JCTree tree) { return false; }
537
538 protected Type check(final DiagnosticPosition pos, final Type found) {
539 return chk.checkType(pos, found, pt, checkContext);
540 }
541
542 protected ResultInfo dup(Type newPt) {
543 return new ResultInfo(pkind, newPt, checkContext, checkMode);
544 }
545
546 protected ResultInfo dup(CheckContext newContext) {
547 return new ResultInfo(pkind, pt, newContext, checkMode);
548 }
549
550 protected ResultInfo dup(Type newPt, CheckContext newContext) {
551 return new ResultInfo(pkind, newPt, newContext, checkMode);
552 }
553
554 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
555 return new ResultInfo(pkind, newPt, newContext, newMode);
556 }
557
558 protected ResultInfo dup(CheckMode newMode) {
559 return new ResultInfo(pkind, pt, checkContext, newMode);
560 }
561
562 @Override
563 public String toString() {
564 if (pt != null) {
565 return pt.toString();
566 } else {
567 return "";
568 }
569 }
570 }
571
572 class MethodAttrInfo extends ResultInfo {
573 public MethodAttrInfo() {
574 this(chk.basicHandler);
575 }
576
577 public MethodAttrInfo(CheckContext checkContext) {
578 super(KindSelector.VAL, Infer.anyPoly, checkContext);
579 }
580
581 @Override
582 protected boolean needsArgumentAttr(JCTree tree) {
583 return true;
584 }
585
586 protected ResultInfo dup(Type newPt) {
587 throw new IllegalStateException();
588 }
589
590 protected ResultInfo dup(CheckContext newContext) {
591 return new MethodAttrInfo(newContext);
592 }
593
594 protected ResultInfo dup(Type newPt, CheckContext newContext) {
595 throw new IllegalStateException();
596 }
597
598 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
599 throw new IllegalStateException();
600 }
601
602 protected ResultInfo dup(CheckMode newMode) {
603 throw new IllegalStateException();
604 }
605 }
606
607 class RecoveryInfo extends ResultInfo {
608
609 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
610 this(deferredAttrContext, Type.recoveryType);
611 }
612
613 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
614 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
615 @Override
616 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
617 return deferredAttrContext;
618 }
619 @Override
620 public boolean compatible(Type found, Type req, Warner warn) {
621 return true;
622 }
623 @Override
624 public void report(DiagnosticPosition pos, JCDiagnostic details) {
625 boolean needsReport = pt == Type.recoveryType ||
626 (details.getDiagnosticPosition() != null &&
627 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
628 if (needsReport) {
629 chk.basicHandler.report(pos, details);
630 }
631 }
632 });
633 }
634 }
635
636 final ResultInfo statInfo;
637 final ResultInfo varAssignmentInfo;
638 final ResultInfo varAssignmentOpInfo;
639 final ResultInfo methodAttrInfo;
640 final ResultInfo unknownExprInfo;
641 final ResultInfo unknownTypeInfo;
642 final ResultInfo unknownTypeExprInfo;
643 final ResultInfo recoveryInfo;
644 final MethodType initBlockType;
645
646 Type pt() {
647 return resultInfo.pt;
648 }
649
650 KindSelector pkind() {
651 return resultInfo.pkind;
652 }
653
654 /* ************************************************************************
655 * Visitor methods
656 *************************************************************************/
657
658 /** Visitor argument: the current environment.
659 */
660 Env<AttrContext> env;
661
662 /** Visitor argument: the currently expected attribution result.
663 */
664 ResultInfo resultInfo;
665
666 /** Visitor result: the computed type.
667 */
668 Type result;
669
670 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
671
672 /** Visitor method: attribute a tree, catching any completion failure
673 * exceptions. Return the tree's type.
674 *
675 * @param tree The tree to be visited.
676 * @param env The environment visitor argument.
677 * @param resultInfo The result info visitor argument.
678 */
679 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
680 Env<AttrContext> prevEnv = this.env;
681 ResultInfo prevResult = this.resultInfo;
682 try {
683 this.env = env;
684 this.resultInfo = resultInfo;
685 if (resultInfo.needsArgumentAttr(tree)) {
686 result = argumentAttr.attribArg(tree, env);
687 } else {
688 tree.accept(this);
689 }
690 matchBindings = matchBindingsComputer.finishBindings(tree,
691 matchBindings);
692 checkBreakTree(tree, env);
693 return result;
694 } catch (CompletionFailure ex) {
695 tree.type = syms.errType;
696 return chk.completionError(tree.pos(), ex);
697 } finally {
698 this.env = prevEnv;
699 this.resultInfo = prevResult;
700 }
701 }
702
703 private void checkBreakTree(JCTree tree, Env<AttrContext> env) {
704 if (tree == breakTree &&
705 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
706 breakTreeFound(copyEnv(env));
707 }
708 }
709
710 protected void breakTreeFound(Env<AttrContext> env) {
711 throw new BreakAttr(env);
712 }
713
714 Env<AttrContext> copyEnv(Env<AttrContext> env) {
715 Env<AttrContext> newEnv =
716 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
717 if (newEnv.outer != null) {
718 newEnv.outer = copyEnv(newEnv.outer);
719 }
720 return newEnv;
721 }
722
723 WriteableScope copyScope(WriteableScope sc) {
724 WriteableScope newScope = WriteableScope.create(sc.owner);
725 List<Symbol> elemsList = List.nil();
726 for (Symbol sym : sc.getSymbols()) {
727 elemsList = elemsList.prepend(sym);
728 }
729 for (Symbol s : elemsList) {
730 newScope.enter(s);
731 }
732 return newScope;
733 }
734
735 /** Derived visitor method: attribute an expression tree.
736 */
737 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
738 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
739 }
740
741 /** Derived visitor method: attribute an expression tree with
742 * no constraints on the computed type.
743 */
744 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
745 return attribTree(tree, env, unknownExprInfo);
746 }
747
748 /** Derived visitor method: attribute a type tree.
749 */
750 public Type attribType(JCTree tree, Env<AttrContext> env) {
751 Type result = attribType(tree, env, Type.noType);
752 return result;
753 }
754
755 /** Derived visitor method: attribute a type tree.
756 */
757 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
758 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
759 return result;
760 }
761
762 /** Derived visitor method: attribute a statement or definition tree.
763 */
764 public Type attribStat(JCTree tree, Env<AttrContext> env) {
765 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
766 Type result = attribTree(tree, env, statInfo);
767 analyzer.analyzeIfNeeded(tree, analyzeEnv);
768 attrRecover.doRecovery();
769 return result;
770 }
771
772 /** Attribute a list of expressions, returning a list of types.
773 */
774 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
775 ListBuffer<Type> ts = new ListBuffer<>();
776 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
777 ts.append(attribExpr(l.head, env, pt));
778 return ts.toList();
779 }
780
781 /** Attribute a list of statements, returning nothing.
782 */
783 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
784 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
785 attribStat(l.head, env);
786 }
787
788 /** Attribute the arguments in a method call, returning the method kind.
789 */
790 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
791 KindSelector kind = initialKind;
792 for (JCExpression arg : trees) {
793 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
794 if (argtype.hasTag(DEFERRED)) {
795 kind = KindSelector.of(KindSelector.POLY, kind);
796 }
797 argtypes.append(argtype);
798 }
799 return kind;
800 }
801
802 /** Attribute a type argument list, returning a list of types.
803 * Caller is responsible for calling checkRefTypes.
804 */
805 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
806 ListBuffer<Type> argtypes = new ListBuffer<>();
807 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
808 argtypes.append(attribType(l.head, env));
809 return argtypes.toList();
810 }
811
812 /** Attribute a type argument list, returning a list of types.
813 * Check that all the types are references.
814 */
815 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
816 List<Type> types = attribAnyTypes(trees, env);
817 return chk.checkRefTypes(trees, types);
818 }
819
820 /**
821 * Attribute type variables (of generic classes or methods).
822 * Compound types are attributed later in attribBounds.
823 * @param typarams the type variables to enter
824 * @param env the current environment
825 */
826 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
827 for (JCTypeParameter tvar : typarams) {
828 TypeVar a = (TypeVar)tvar.type;
829 a.tsym.flags_field |= UNATTRIBUTED;
830 a.setUpperBound(Type.noType);
831 if (!tvar.bounds.isEmpty()) {
832 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
833 for (JCExpression bound : tvar.bounds.tail)
834 bounds = bounds.prepend(attribType(bound, env));
835 bounds = bounds.reverse();
836 if (bounds.head.hasTag(ARRAY)) {
837 /* A single bound that is an array type may structurally reference
838 * this same type variable, as in `<T extends T[]>`, setting the bound to
839 * Object as a recovery strategy
840 */
841 types.setBounds(a, List.of(syms.objectType));
842 } else {
843 types.setBounds(a, bounds);
844 }
845 } else {
846 // if no bounds are given, assume a single bound of
847 // java.lang.Object.
848 types.setBounds(a, List.of(syms.objectType));
849 }
850 a.tsym.flags_field &= ~UNATTRIBUTED;
851 }
852 if (checkCyclic) {
853 for (JCTypeParameter tvar : typarams) {
854 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
855 }
856 }
857 }
858
859 /**
860 * Attribute the type references in a list of annotations.
861 */
862 void attribAnnotationTypes(List<JCAnnotation> annotations,
863 Env<AttrContext> env) {
864 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
865 JCAnnotation a = al.head;
866 attribType(a.annotationType, env);
867 }
868 }
869
870 /**
871 * Attribute a "lazy constant value".
872 * @param env The env for the const value
873 * @param variable The initializer for the const value
874 * @param type The expected type, or null
875 * @see VarSymbol#setLazyConstValue
876 */
877 public Object attribLazyConstantValue(Env<AttrContext> env,
878 Env<AttrContext> enclosingEnv,
879 JCVariableDecl variable,
880 Type type) {
881 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
882 try {
883 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
884 Type itype = attribExpr(variable.init, env, type);
885 if (variable.isImplicitlyTyped()) {
886 //fixup local variable type
887 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
888 }
889 if (itype.constValue() != null) {
890 return coerce(itype, type).constValue();
891 } else {
892 return null;
893 }
894 } finally {
895 log.useSource(prevSource);
896 }
897 }
898
899 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
900 * Supertypes of anonymous inner classes are usually already attributed.
901 *
902 * @param tree The tree making up the type reference.
903 * @param env The environment current at the reference.
904 * @param classExpected true if only a class is expected here.
905 * @param interfaceExpected true if only an interface is expected here.
906 */
907 Type attribBase(JCTree tree,
908 Env<AttrContext> env,
909 boolean classExpected,
910 boolean interfaceExpected,
911 boolean checkExtensible) {
912 Type t = tree.type != null ?
913 tree.type :
914 attribType(tree, env);
915 try {
916 return tree.type = checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
917 } catch (CompletionFailure ex) {
918 chk.completionError(tree.pos(), ex);
919 return t;
920 }
921 }
922 Type checkBase(Type t,
923 JCTree tree,
924 Env<AttrContext> env,
925 boolean classExpected,
926 boolean interfaceExpected,
927 boolean checkExtensible) {
928 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
929 (((JCTypeApply) tree).clazz).pos() : tree.pos();
930 if (t.tsym.isAnonymous()) {
931 log.error(pos, Errors.CantInheritFromAnon);
932 return types.createErrorType(t);
933 }
934 if (t.isErroneous())
935 return t;
936 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
937 // check that type variable is already visible
938 if (t.getUpperBound() == null) {
939 log.error(pos, Errors.IllegalForwardRef);
940 return types.createErrorType(t);
941 }
942 } else {
943 t = chk.checkClassType(pos, t, checkExtensible);
944 }
945 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
946 log.error(pos, Errors.IntfExpectedHere);
947 // return errType is necessary since otherwise there might
948 // be undetected cycles which cause attribution to loop
949 return types.createErrorType(t);
950 } else if (checkExtensible &&
951 classExpected &&
952 (t.tsym.flags() & INTERFACE) != 0) {
953 log.error(pos, Errors.NoIntfExpectedHere);
954 return types.createErrorType(t);
955 }
956 if (checkExtensible &&
957 ((t.tsym.flags() & FINAL) != 0)) {
958 log.error(pos,
959 Errors.CantInheritFromFinal(t.tsym));
960 }
961 chk.checkNonCyclic(pos, t);
962 return t;
963 }
964
965 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
966 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
967 id.type = env.info.scope.owner.enclClass().type;
968 id.sym = env.info.scope.owner.enclClass();
969 return id.type;
970 }
971
972 public void visitClassDef(JCClassDecl tree) {
973 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
974 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
975 argumentAttr.withLocalCacheContext() : null);
976 EarlyConstructionContext earlyConstructionPrev = env.info.earlyContext;
977 try {
978 env.info.earlyContext = earlyConstructionPrev.nested(true);
979 // Local and anonymous classes have not been entered yet, so we need to
980 // do it now.
981 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
982 enter.classEnter(tree, env);
983 } else {
984 // If this class declaration is part of a class level annotation,
985 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
986 // order to simplify later steps and allow for sensible error
987 // messages.
988 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
989 enter.classEnter(tree, env);
990 }
991
992 ClassSymbol c = tree.sym;
993 if (c == null) {
994 // exit in case something drastic went wrong during enter.
995 result = null;
996 } else {
997 // make sure class has been completed:
998 c.complete();
999
1000 // If a class declaration appears in a constructor prologue,
1001 // that means it's either a local class or an anonymous class.
1002 // Either way, there is no immediately enclosing instance.
1003 if (earlyConstructionPrev.ctorPrologue()) {
1004 c.flags_field |= NOOUTERTHIS;
1005 }
1006 attribClass(tree.pos(), c);
1007 result = tree.type = c.type;
1008 }
1009 } finally {
1010 localCacheContext.ifPresent(LocalCacheContext::leave);
1011 env.info.earlyContext = earlyConstructionPrev;
1012 }
1013 }
1014
1015 public void visitMethodDef(JCMethodDecl tree) {
1016 MethodSymbol m = tree.sym;
1017 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1018
1019 Lint lint = env.info.lint.augment(m);
1020 Lint prevLint = chk.setLint(lint);
1021 EarlyConstructionContext earlyConstructionPrev = env.info.earlyContext;
1022 Assert.check(!earlyConstructionPrev.ctorPrologue());
1023 MethodSymbol prevMethod = chk.setMethod(m);
1024 try {
1025 chk.checkDeprecatedAnnotation(tree.pos(), m);
1026
1027
1028 // Create a new environment with local scope
1029 // for attributing the method.
1030 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1031 localEnv.info.lint = lint;
1032
1033 attribStats(tree.typarams, localEnv);
1034
1035 // If we override any other methods, check that we do so properly.
1036 // JLS ???
1037 if (m.isStatic()) {
1038 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1039 } else {
1040 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1041 }
1042 chk.checkOverride(env, tree, m);
1043
1044 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1045 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1046 }
1047
1048 // Enter all type parameters into the local method scope.
1049 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1050 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1051
1052 ClassSymbol owner = env.enclClass.sym;
1053 if ((owner.flags() & ANNOTATION) != 0 &&
1054 (tree.params.nonEmpty() ||
1055 tree.recvparam != null))
1056 log.error(tree.params.nonEmpty() ?
1057 tree.params.head.pos() :
1058 tree.recvparam.pos(),
1059 Errors.IntfAnnotationMembersCantHaveParams);
1060
1061 // Attribute all value parameters.
1062 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1063 attribStat(l.head, localEnv);
1064 }
1065
1066 chk.checkVarargsMethodDecl(localEnv, tree);
1067
1068 // Check that type parameters are well-formed.
1069 chk.validate(tree.typarams, localEnv);
1070
1071 // Check that result type is well-formed.
1072 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) {
1073 chk.validate(tree.restype, localEnv);
1074 }
1075 chk.checkRequiresIdentity(tree, env.info.lint);
1076
1077 // Check that receiver type is well-formed.
1078 if (tree.recvparam != null) {
1079 // Use a new environment to check the receiver parameter.
1080 // Otherwise I get "might not have been initialized" errors.
1081 // Is there a better way?
1082 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1083 attribType(tree.recvparam, newEnv);
1084 chk.validate(tree.recvparam, newEnv);
1085 }
1086
1087 // Is this method a constructor?
1088 boolean isConstructor = TreeInfo.isConstructor(tree);
1089
1090 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1091 // lets find if this method is an accessor
1092 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1093 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1094 if (recordComponent.isPresent()) {
1095 // the method is a user defined accessor lets check that everything is fine
1096 if (!tree.sym.isPublic()) {
1097 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1098 }
1099 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1100 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1101 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1102 }
1103 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1104 log.error(tree,
1105 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1106 }
1107 if (!tree.typarams.isEmpty()) {
1108 log.error(tree,
1109 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1110 }
1111 if (tree.sym.isStatic()) {
1112 log.error(tree,
1113 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1114 }
1115 }
1116
1117 if (isConstructor) {
1118 // if this a constructor other than the canonical one
1119 if ((tree.sym.flags_field & RECORD) == 0) {
1120 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1121 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1122 }
1123 } else {
1124 // but if it is the canonical:
1125
1126 /* if user generated, then it shouldn't:
1127 * - have an accessibility stricter than that of the record type
1128 * - explicitly invoke any other constructor
1129 */
1130 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1131 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1132 log.error(tree,
1133 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1134 Errors.InvalidCanonicalConstructorInRecord(
1135 Fragments.Canonical,
1136 env.enclClass.sym.name,
1137 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1138 ) :
1139 Errors.InvalidCanonicalConstructorInRecord(
1140 Fragments.Canonical,
1141 env.enclClass.sym.name,
1142 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1143 )
1144 );
1145 }
1146
1147 if ((!allowValueClasses || TreeInfo.isCompactConstructor(tree)) &&
1148 TreeInfo.hasAnyConstructorCall(tree)) {
1149 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1150 Fragments.Canonical, env.enclClass.sym.name,
1151 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1152 }
1153 }
1154
1155 // also we want to check that no type variables have been defined
1156 if (!tree.typarams.isEmpty()) {
1157 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1158 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1159 }
1160
1161 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1162 * record components
1163 */
1164 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1165 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1166 for (JCVariableDecl param: tree.params) {
1167 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1168 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1169 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1170 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1171 Fragments.Canonical, env.enclClass.sym.name,
1172 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1173 }
1174 recordComponents = recordComponents.tail;
1175 recordFieldTypes = recordFieldTypes.tail;
1176 }
1177 }
1178 }
1179 }
1180
1181 // annotation method checks
1182 if ((owner.flags() & ANNOTATION) != 0) {
1183 // annotation method cannot have throws clause
1184 if (tree.thrown.nonEmpty()) {
1185 log.error(tree.thrown.head.pos(),
1186 Errors.ThrowsNotAllowedInIntfAnnotation);
1187 }
1188 // annotation method cannot declare type-parameters
1189 if (tree.typarams.nonEmpty()) {
1190 log.error(tree.typarams.head.pos(),
1191 Errors.IntfAnnotationMembersCantHaveTypeParams);
1192 }
1193 // validate annotation method's return type (could be an annotation type)
1194 chk.validateAnnotationType(tree.restype);
1195 // ensure that annotation method does not clash with members of Object/Annotation
1196 chk.validateAnnotationMethod(tree.pos(), m);
1197 }
1198
1199 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1200 chk.checkType(l.head.pos(), l.head.type, syms.throwableType, chk.subtypeHandler);
1201
1202 if (tree.body == null) {
1203 // Empty bodies are only allowed for
1204 // abstract, native, or interface methods, or for methods
1205 // in a retrofit signature class.
1206 if (tree.defaultValue != null) {
1207 if ((owner.flags() & ANNOTATION) == 0)
1208 log.error(tree.pos(),
1209 Errors.DefaultAllowedInIntfAnnotationMember);
1210 }
1211 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1212 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract(tree.sym, owner));
1213 } else {
1214 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1215 if ((owner.flags() & INTERFACE) != 0) {
1216 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1217 } else {
1218 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1219 }
1220 } else if ((tree.mods.flags & NATIVE) != 0) {
1221 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1222 }
1223 // Add an implicit super() call unless an explicit call to
1224 // super(...) or this(...) is given
1225 // or we are compiling class java.lang.Object.
1226 if (isConstructor && owner.type != syms.objectType) {
1227 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1228 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1229 make.Ident(names._super), make.Idents(List.nil())));
1230 if (allowValueClasses && (owner.isValueClass() || owner.isRecord())) {
1231 tree.body.stats = tree.body.stats.append(supCall);
1232 } else {
1233 tree.body.stats = tree.body.stats.prepend(supCall);
1234 }
1235 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1236 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1237 TreeInfo.hasConstructorCall(tree, names._super)) {
1238 // enum constructors are not allowed to call super
1239 // directly, so make sure there aren't any super calls
1240 // in enum constructors, except in the compiler
1241 // generated one.
1242 log.error(tree.body.stats.head.pos(),
1243 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1244 }
1245 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1246 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1247 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1248 if (!initParamNames.equals(recordComponentNames)) {
1249 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1250 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1251 }
1252 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1253 log.error(tree,
1254 Errors.InvalidCanonicalConstructorInRecord(
1255 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1256 env.enclClass.sym.name,
1257 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1258 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1259 }
1260 }
1261 }
1262
1263 // Attribute all type annotations in the body
1264 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1265 annotate.flush();
1266
1267 // Start of constructor prologue (if not in java.lang.Object constructor)
1268 if (isConstructor && owner.type != syms.objectType) {
1269 boolean hasThisConstructorCall = TreeInfo.hasConstructorCall(tree, names._this);
1270 localEnv.info.earlyContext = EarlyConstructionContext.of(owner,
1271 hasThisConstructorCall && allowValueClasses);
1272 }
1273
1274 // Attribute method body.
1275 attribStat(tree.body, localEnv);
1276 }
1277
1278 localEnv.info.scope.leave();
1279 result = tree.type = m.type;
1280 } finally {
1281 chk.setLint(prevLint);
1282 chk.setMethod(prevMethod);
1283 env.info.earlyContext = earlyConstructionPrev;
1284 }
1285 }
1286
1287 public void visitVarDef(JCVariableDecl tree) {
1288 // Local variables have not been entered yet, so we need to do it now:
1289 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1290 if (tree.sym != null) {
1291 // parameters have already been entered
1292 env.info.scope.enter(tree.sym);
1293 } else {
1294 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0 && tree.type == null) {
1295 if (tree.init == null) {
1296 //cannot use 'var' without initializer
1297 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1298 tree.type = syms.errType;
1299 } else {
1300 Fragment msg = canInferLocalVarType(tree);
1301 if (msg != null) {
1302 //cannot use 'var' with initializer which require an explicit target
1303 //(e.g. lambda, method reference, array initializer).
1304 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1305 tree.type = syms.errType;
1306 }
1307 }
1308 }
1309 try {
1310 annotate.blockAnnotations();
1311 memberEnter.memberEnter(tree, env);
1312 typeAnnotations.organizeTypeAnnotationsSignaturesForLocalVarType(env, tree);
1313 } finally {
1314 annotate.unblockAnnotations();
1315 }
1316 }
1317 } else {
1318 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1319 }
1320
1321 VarSymbol v = tree.sym;
1322 Lint lint = env.info.lint.augment(v);
1323 Lint prevLint = chk.setLint(lint);
1324
1325 // Check that the variable's declared type is well-formed.
1326 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1327 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1328 (tree.sym.flags() & PARAMETER) != 0;
1329 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1330
1331 try {
1332 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1333 chk.checkDeprecatedAnnotation(tree.pos(), v);
1334
1335 if (tree.init != null) {
1336 if ((v.flags_field & FINAL) == 0 ||
1337 !memberEnter.needsLazyConstValue(tree.init)) {
1338 // Not a compile-time constant
1339 // Attribute initializer in a new environment
1340 // with the declared variable as owner.
1341 // Check that initializer conforms to variable's declared type.
1342 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1343 initEnv.info.lint = lint;
1344 // In order to catch self-references, we set the variable's
1345 // declaration position to maximal possible value, effectively
1346 // marking the variable as undefined.
1347 initEnv.info.enclVar = v;
1348 EarlyConstructionContext previousEarlyConstruction = initEnv.info.earlyContext;
1349 try {
1350 if (v.isStrictInstance() && allowValueClasses) {
1351 // instance strict field init occur in early construction context
1352 initEnv.info.earlyContext = EarlyConstructionContext.of((ClassSymbol)v.owner, false);
1353 }
1354 attribExpr(tree.init, initEnv, v.type);
1355 if (tree.isImplicitlyTyped()) {
1356 //fixup local variable type
1357 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1358 }
1359 } finally {
1360 initEnv.info.earlyContext = previousEarlyConstruction;
1361 }
1362 }
1363 if (tree.isImplicitlyTyped()) {
1364 setupImplicitlyTypedVariable(tree, v.type);
1365 }
1366 }
1367 result = tree.type = v.type;
1368 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1369 if (isNonArgsMethodInObject(v.name)) {
1370 log.error(tree, Errors.IllegalRecordComponentName(v));
1371 }
1372 }
1373 chk.checkRequiresIdentity(tree, env.info.lint);
1374 }
1375 finally {
1376 chk.setLint(prevLint);
1377 }
1378 }
1379
1380 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1381 if (tree.init != null &&
1382 (tree.sym.flags_field & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1383 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1384 tree.sym.flags_field |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1385 // Field initializer expression need to be entered.
1386 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym);
1387 annotate.flush();
1388 }
1389 }
1390
1391 private boolean isNonArgsMethodInObject(Name name) {
1392 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1393 if (s.type.getParameterTypes().isEmpty()) {
1394 return true;
1395 }
1396 }
1397 return false;
1398 }
1399
1400 Fragment canInferLocalVarType(JCVariableDecl tree) {
1401 LocalInitScanner lis = new LocalInitScanner();
1402 lis.scan(tree.init);
1403 return lis.badInferenceMsg;
1404 }
1405
1406 static class LocalInitScanner extends TreeScanner {
1407 Fragment badInferenceMsg = null;
1408 boolean needsTarget = true;
1409
1410 @Override
1411 public void visitNewArray(JCNewArray tree) {
1412 if (tree.elemtype == null && needsTarget) {
1413 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1414 }
1415 }
1416
1417 @Override
1418 public void visitLambda(JCLambda tree) {
1419 if (needsTarget) {
1420 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1421 }
1422 }
1423
1424 @Override
1425 public void visitTypeCast(JCTypeCast tree) {
1426 boolean prevNeedsTarget = needsTarget;
1427 try {
1428 needsTarget = false;
1429 super.visitTypeCast(tree);
1430 } finally {
1431 needsTarget = prevNeedsTarget;
1432 }
1433 }
1434
1435 @Override
1436 public void visitReference(JCMemberReference tree) {
1437 if (needsTarget) {
1438 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1439 }
1440 }
1441
1442 @Override
1443 public void visitNewClass(JCNewClass tree) {
1444 boolean prevNeedsTarget = needsTarget;
1445 try {
1446 needsTarget = false;
1447 super.visitNewClass(tree);
1448 } finally {
1449 needsTarget = prevNeedsTarget;
1450 }
1451 }
1452
1453 @Override
1454 public void visitApply(JCMethodInvocation tree) {
1455 boolean prevNeedsTarget = needsTarget;
1456 try {
1457 needsTarget = false;
1458 super.visitApply(tree);
1459 } finally {
1460 needsTarget = prevNeedsTarget;
1461 }
1462 }
1463 }
1464
1465 public void visitSkip(JCSkip tree) {
1466 result = null;
1467 }
1468
1469 public void visitBlock(JCBlock tree) {
1470 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1471 // Block is a static or instance initializer;
1472 // let the owner of the environment be a freshly
1473 // created BLOCK-method.
1474 Symbol fakeOwner =
1475 new MethodSymbol(tree.flags | BLOCK |
1476 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1477 env.info.scope.owner);
1478 final Env<AttrContext> localEnv =
1479 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1480
1481 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1482 // Attribute all type annotations in the block
1483 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1484 annotate.flush();
1485 attribStats(tree.stats, localEnv);
1486
1487 {
1488 // Store init and clinit type annotations with the ClassSymbol
1489 // to allow output in Gen.normalizeDefs.
1490 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1491 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1492 if ((tree.flags & STATIC) != 0) {
1493 cs.appendClassInitTypeAttributes(tas);
1494 } else {
1495 cs.appendInitTypeAttributes(tas);
1496 }
1497 }
1498 } else {
1499 // Create a new local environment with a local scope.
1500 Env<AttrContext> localEnv =
1501 env.dup(tree, env.info.dup(env.info.scope.dup()));
1502 try {
1503 attribStats(tree.stats, localEnv);
1504 } finally {
1505 localEnv.info.scope.leave();
1506 }
1507 }
1508 result = null;
1509 }
1510
1511 public void visitDoLoop(JCDoWhileLoop tree) {
1512 attribStat(tree.body, env.dup(tree));
1513 attribExpr(tree.cond, env, syms.booleanType);
1514 handleLoopConditionBindings(matchBindings, tree, tree.body);
1515 result = null;
1516 }
1517
1518 public void visitWhileLoop(JCWhileLoop tree) {
1519 attribExpr(tree.cond, env, syms.booleanType);
1520 MatchBindings condBindings = matchBindings;
1521 // include condition's bindings when true in the body:
1522 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1523 try {
1524 attribStat(tree.body, whileEnv.dup(tree));
1525 } finally {
1526 whileEnv.info.scope.leave();
1527 }
1528 handleLoopConditionBindings(condBindings, tree, tree.body);
1529 result = null;
1530 }
1531
1532 public void visitForLoop(JCForLoop tree) {
1533 Env<AttrContext> loopEnv =
1534 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1535 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1536 try {
1537 attribStats(tree.init, loopEnv);
1538 if (tree.cond != null) {
1539 attribExpr(tree.cond, loopEnv, syms.booleanType);
1540 // include condition's bindings when true in the body and step:
1541 condBindings = matchBindings;
1542 }
1543 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1544 try {
1545 bodyEnv.tree = tree; // before, we were not in loop!
1546 attribStats(tree.step, bodyEnv);
1547 attribStat(tree.body, bodyEnv);
1548 } finally {
1549 bodyEnv.info.scope.leave();
1550 }
1551 result = null;
1552 }
1553 finally {
1554 loopEnv.info.scope.leave();
1555 }
1556 handleLoopConditionBindings(condBindings, tree, tree.body);
1557 }
1558
1559 /**
1560 * Include condition's bindings when false after the loop, if cannot get out of the loop
1561 */
1562 private void handleLoopConditionBindings(MatchBindings condBindings,
1563 JCStatement loop,
1564 JCStatement loopBody) {
1565 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1566 !breaksTo(env, loop, loopBody)) {
1567 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1568 }
1569 }
1570
1571 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1572 preFlow(body);
1573 return flow.breaksToTree(env, loop, body, make);
1574 }
1575
1576 /**
1577 * Add given bindings to the current scope, unless there's a break to
1578 * an immediately enclosing labeled statement.
1579 */
1580 private void addBindings2Scope(JCStatement introducingStatement,
1581 List<BindingSymbol> bindings) {
1582 if (bindings.isEmpty()) {
1583 return ;
1584 }
1585
1586 var searchEnv = env;
1587 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1588 labeled.body == introducingStatement) {
1589 if (breaksTo(env, labeled, labeled.body)) {
1590 //breaking to an immediately enclosing labeled statement
1591 return ;
1592 }
1593 searchEnv = searchEnv.next;
1594 introducingStatement = labeled;
1595 }
1596
1597 //include condition's body when false after the while, if cannot get out of the loop
1598 bindings.forEach(env.info.scope::enter);
1599 bindings.forEach(BindingSymbol::preserveBinding);
1600 }
1601
1602 public void visitForeachLoop(JCEnhancedForLoop tree) {
1603 Env<AttrContext> loopEnv =
1604 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1605 try {
1606 //the Formal Parameter of a for-each loop is not in the scope when
1607 //attributing the for-each expression; we mimic this by attributing
1608 //the for-each expression first (against original scope).
1609 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1610 chk.checkNonVoid(tree.pos(), exprType);
1611 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1612 if (elemtype == null) {
1613 // or perhaps expr implements Iterable<T>?
1614 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1615 if (base == null) {
1616 log.error(tree.expr.pos(),
1617 Errors.ForeachNotApplicableToType(exprType,
1618 Fragments.TypeReqArrayOrIterable));
1619 elemtype = types.createErrorType(exprType);
1620 } else {
1621 List<Type> iterableParams = base.allparams();
1622 elemtype = iterableParams.isEmpty()
1623 ? syms.objectType
1624 : types.wildUpperBound(iterableParams.head);
1625
1626 // Check the return type of the method iterator().
1627 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1628 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1629 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1630 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1631 log.error(tree.pos(),
1632 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1633 }
1634 }
1635 }
1636 if (tree.var.isImplicitlyTyped()) {
1637 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1638 tree.var.type = inferredType;
1639 setupImplicitlyTypedVariable(tree.var, inferredType);
1640 }
1641 attribStat(tree.var, loopEnv);
1642 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1643 loopEnv.tree = tree; // before, we were not in loop!
1644 attribStat(tree.body, loopEnv);
1645 result = null;
1646 }
1647 finally {
1648 loopEnv.info.scope.leave();
1649 }
1650 }
1651
1652 public void visitLabelled(JCLabeledStatement tree) {
1653 // Check that label is not used in an enclosing statement
1654 Env<AttrContext> env1 = env;
1655 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1656 if (env1.tree.hasTag(LABELLED) &&
1657 ((JCLabeledStatement) env1.tree).label == tree.label) {
1658 log.error(tree.pos(),
1659 Errors.LabelAlreadyInUse(tree.label));
1660 break;
1661 }
1662 env1 = env1.next;
1663 }
1664
1665 attribStat(tree.body, env.dup(tree));
1666 result = null;
1667 }
1668
1669 public void visitSwitch(JCSwitch tree) {
1670 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1671 attribStats(c.stats, caseEnv);
1672 });
1673 result = null;
1674 }
1675
1676 public void visitSwitchExpression(JCSwitchExpression tree) {
1677 boolean wrongContext = false;
1678
1679 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1680 PolyKind.STANDALONE : PolyKind.POLY;
1681
1682 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1683 //this means we are returning a poly conditional from void-compatible lambda expression
1684 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1685 resultInfo = recoveryInfo;
1686 wrongContext = true;
1687 }
1688
1689 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1690 unknownExprInfo :
1691 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1692
1693 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1694 ListBuffer<Type> caseTypes = new ListBuffer<>();
1695
1696 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1697 caseEnv.info.yieldResult = condInfo;
1698 attribStats(c.stats, caseEnv);
1699 new TreeScanner() {
1700 @Override
1701 public void visitYield(JCYield brk) {
1702 if (brk.target == tree) {
1703 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1704 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1705 }
1706 super.visitYield(brk);
1707 }
1708
1709 @Override public void visitClassDef(JCClassDecl tree) {}
1710 @Override public void visitLambda(JCLambda tree) {}
1711 }.scan(c.stats);
1712 });
1713
1714 if (tree.cases.isEmpty()) {
1715 log.error(tree.pos(),
1716 Errors.SwitchExpressionEmpty);
1717 } else if (caseTypes.isEmpty()) {
1718 log.error(tree.pos(),
1719 Errors.SwitchExpressionNoResultExpressions);
1720 }
1721
1722 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1723
1724 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1725 }
1726 //where:
1727 CheckContext switchExpressionContext(CheckContext checkContext) {
1728 return new Check.NestedCheckContext(checkContext) {
1729 //this will use enclosing check context to check compatibility of
1730 //subexpression against target type; if we are in a method check context,
1731 //depending on whether boxing is allowed, we could have incompatibilities
1732 @Override
1733 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1734 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1735 }
1736 };
1737 }
1738
1739 private void handleSwitch(JCTree switchTree,
1740 JCExpression selector,
1741 List<JCCase> cases,
1742 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1743 Type seltype = attribExpr(selector, env);
1744 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
1745
1746 Env<AttrContext> switchEnv =
1747 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1748
1749 try {
1750 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1751 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1752 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
1753 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1754 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1755 boolean patternSwitch;
1756 if (seltype.isPrimitive() && !intSwitch) {
1757 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1758 patternSwitch = true;
1759 }
1760 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1761 !intSwitch) {
1762 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1763 patternSwitch = true;
1764 } else {
1765 patternSwitch = cases.stream()
1766 .flatMap(c -> c.labels.stream())
1767 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1768 TreeInfo.isNullCaseLabel(l));
1769 }
1770
1771 // Attribute all cases and
1772 // check that there are no duplicate case labels or default clauses.
1773 Set<Object> constants = new HashSet<>(); // The set of case constants.
1774 boolean hasDefault = false; // Is there a default label?
1775 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1776 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1777 boolean hasNullPattern = false; // Is there a null pattern?
1778 CaseTree.CaseKind caseKind = null;
1779 boolean wasError = false;
1780 JCCaseLabel unconditionalCaseLabel = null;
1781 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1782 JCCase c = l.head;
1783 if (caseKind == null) {
1784 caseKind = c.caseKind;
1785 } else if (caseKind != c.caseKind && !wasError) {
1786 log.error(c.pos(),
1787 Errors.SwitchMixingCaseTypes);
1788 wasError = true;
1789 }
1790 MatchBindings currentBindings = null;
1791 MatchBindings guardBindings = null;
1792 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1793 JCCaseLabel label = labels.head;
1794 if (label instanceof JCConstantCaseLabel constLabel) {
1795 JCExpression expr = constLabel.expr;
1796 if (TreeInfo.isNull(expr)) {
1797 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1798 if (hasNullPattern) {
1799 log.error(label.pos(), Errors.DuplicateCaseLabel);
1800 }
1801 hasNullPattern = true;
1802 attribExpr(expr, switchEnv, seltype);
1803 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1804 } else if (enumSwitch) {
1805 Symbol sym = enumConstant(expr, seltype);
1806 if (sym == null) {
1807 if (allowPatternSwitch) {
1808 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1809 Symbol enumSym = TreeInfo.symbol(expr);
1810 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1811 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1812 } else if (!constants.add(enumSym)) {
1813 log.error(label.pos(), Errors.DuplicateCaseLabel);
1814 }
1815 } else {
1816 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1817 }
1818 } else if (!constants.add(sym)) {
1819 log.error(label.pos(), Errors.DuplicateCaseLabel);
1820 }
1821 } else if (errorEnumSwitch) {
1822 //error recovery: the selector is erroneous, and all the case labels
1823 //are identifiers. This could be an enum switch - don't report resolve
1824 //error for the case label:
1825 var prevResolveHelper = rs.basicLogResolveHelper;
1826 try {
1827 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1828 attribExpr(expr, switchEnv, seltype);
1829 } finally {
1830 rs.basicLogResolveHelper = prevResolveHelper;
1831 }
1832 } else {
1833 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1834 if (!pattype.hasTag(ERROR)) {
1835 if (pattype.constValue() == null) {
1836 Symbol s = TreeInfo.symbol(expr);
1837 if (s != null && s.kind == TYP) {
1838 log.error(expr.pos(),
1839 Errors.PatternExpected);
1840 } else if (s == null || !s.isEnum()) {
1841 log.error(expr.pos(),
1842 (stringSwitch ? Errors.StringConstReq
1843 : intSwitch ? Errors.ConstExprReq
1844 : Errors.PatternOrEnumReq));
1845 } else if (!constants.add(s)) {
1846 log.error(label.pos(), Errors.DuplicateCaseLabel);
1847 }
1848 }
1849 else {
1850 boolean isLongFloatDoubleOrBooleanConstant =
1851 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
1852 if (isLongFloatDoubleOrBooleanConstant) {
1853 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
1854 }
1855 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
1856 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1857 } else if (!constants.add(pattype.constValue())) {
1858 log.error(c.pos(), Errors.DuplicateCaseLabel);
1859 }
1860 }
1861 }
1862 }
1863 } else if (label instanceof JCDefaultCaseLabel def) {
1864 if (hasDefault) {
1865 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1866 } else if (hasUnconditionalPattern) {
1867 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1868 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1869 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1870 }
1871 hasDefault = true;
1872 matchBindings = MatchBindingsComputer.EMPTY;
1873 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1874 //pattern
1875 JCPattern pat = patternlabel.pat;
1876 attribExpr(pat, switchEnv, seltype);
1877 Type primaryType = TreeInfo.primaryPatternType(pat);
1878
1879 if (primaryType.isPrimitive()) {
1880 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1881 } else if (!primaryType.hasTag(TYPEVAR)) {
1882 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1883 }
1884 checkCastablePattern(pat.pos(), seltype, primaryType);
1885 Type patternType = types.erasure(primaryType);
1886 JCExpression guard = c.guard;
1887 if (guardBindings == null && guard != null) {
1888 MatchBindings afterPattern = matchBindings;
1889 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1890 try {
1891 attribExpr(guard, bodyEnv, syms.booleanType);
1892 } finally {
1893 bodyEnv.info.scope.leave();
1894 }
1895
1896 guardBindings = matchBindings;
1897 matchBindings = afterPattern;
1898
1899 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1900 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1901 }
1902 }
1903 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1904 boolean unconditional =
1905 unguarded &&
1906 !patternType.isErroneous() &&
1907 types.isUnconditionallyExactTypeBased(seltype, patternType);
1908 if (unconditional) {
1909 if (hasUnconditionalPattern) {
1910 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1911 } else if (hasDefault) {
1912 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1913 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1914 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1915 }
1916 hasUnconditionalPattern = true;
1917 unconditionalCaseLabel = label;
1918 }
1919 lastPatternErroneous = patternType.isErroneous();
1920 } else {
1921 Assert.error();
1922 }
1923 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1924 }
1925
1926 if (guardBindings != null) {
1927 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1928 }
1929
1930 Env<AttrContext> caseEnv =
1931 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1932 try {
1933 attribCase.accept(c, caseEnv);
1934 } finally {
1935 caseEnv.info.scope.leave();
1936 }
1937 addVars(c.stats, switchEnv.info.scope);
1938
1939 preFlow(c);
1940 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1941 }
1942 if (patternSwitch) {
1943 chk.checkSwitchCaseStructure(cases);
1944 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1945 }
1946 if (switchTree.hasTag(SWITCH)) {
1947 ((JCSwitch) switchTree).hasUnconditionalPattern =
1948 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1949 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1950 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1951 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1952 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1953 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1954 } else {
1955 Assert.error(switchTree.getTag().name());
1956 }
1957 } finally {
1958 switchEnv.info.scope.leave();
1959 }
1960 }
1961 // where
1962 private ResultInfo caseLabelResultInfo(Type seltype) {
1963 return new ResultInfo(KindSelector.VAL_TYP,
1964 !seltype.hasTag(ERROR) ? seltype
1965 : Type.noType);
1966 }
1967 /** Add any variables defined in stats to the switch scope. */
1968 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1969 for (;stats.nonEmpty(); stats = stats.tail) {
1970 JCTree stat = stats.head;
1971 if (stat.hasTag(VARDEF))
1972 switchScope.enter(((JCVariableDecl) stat).sym);
1973 }
1974 }
1975 // where
1976 /** Return the selected enumeration constant symbol, or null. */
1977 private Symbol enumConstant(JCTree tree, Type enumType) {
1978 if (tree.hasTag(IDENT)) {
1979 JCIdent ident = (JCIdent)tree;
1980 Name name = ident.name;
1981 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1982 if (sym.kind == VAR) {
1983 Symbol s = ident.sym = sym;
1984 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1985 ident.type = s.type;
1986 return ((s.flags_field & Flags.ENUM) == 0)
1987 ? null : s;
1988 }
1989 }
1990 }
1991 return null;
1992 }
1993
1994 public void visitSynchronized(JCSynchronized tree) {
1995 boolean identityType = chk.checkIdentityRefType(tree.pos(), attribExpr(tree.lock, env));
1996 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
1997 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1998 }
1999 attribStat(tree.body, env);
2000 result = null;
2001 }
2002
2003 public void visitTry(JCTry tree) {
2004 // Create a new local environment with a local
2005 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
2006 try {
2007 boolean isTryWithResource = tree.resources.nonEmpty();
2008 // Create a nested environment for attributing the try block if needed
2009 Env<AttrContext> tryEnv = isTryWithResource ?
2010 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2011 localEnv;
2012 try {
2013 // Attribute resource declarations
2014 for (JCTree resource : tree.resources) {
2015 CheckContext twrContext = new Check.NestedCheckContext(chk.subtypeHandler) {
2016 @Override
2017 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2018 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
2019 }
2020 };
2021 ResultInfo twrResult =
2022 new ResultInfo(KindSelector.VAR,
2023 syms.autoCloseableType,
2024 twrContext);
2025 if (resource.hasTag(VARDEF)) {
2026 attribStat(resource, tryEnv);
2027 twrResult.check(resource, resource.type);
2028
2029 //check that resource type cannot throw InterruptedException
2030 checkAutoCloseable(localEnv, resource, true);
2031
2032 VarSymbol var = ((JCVariableDecl) resource).sym;
2033
2034 var.flags_field |= Flags.FINAL;
2035 var.setData(ElementKind.RESOURCE_VARIABLE);
2036 } else {
2037 attribTree(resource, tryEnv, twrResult);
2038 }
2039 }
2040 // Attribute body
2041 attribStat(tree.body, tryEnv);
2042 } finally {
2043 if (isTryWithResource)
2044 tryEnv.info.scope.leave();
2045 }
2046
2047 // Attribute catch clauses
2048 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2049 JCCatch c = l.head;
2050 Env<AttrContext> catchEnv =
2051 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2052 try {
2053 Type ctype = attribStat(c.param, catchEnv);
2054 if (TreeInfo.isMultiCatch(c)) {
2055 //multi-catch parameter is implicitly marked as final
2056 c.param.sym.flags_field |= FINAL | UNION;
2057 }
2058 if (c.param.sym.kind == VAR) {
2059 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2060 }
2061 chk.checkType(c.param.vartype.pos(),
2062 chk.checkClassType(c.param.vartype.pos(), ctype),
2063 syms.throwableType,
2064 chk.subtypeHandler);
2065 attribStat(c.body, catchEnv);
2066 } finally {
2067 catchEnv.info.scope.leave();
2068 }
2069 }
2070
2071 // Attribute finalizer
2072 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2073 result = null;
2074 }
2075 finally {
2076 localEnv.info.scope.leave();
2077 }
2078 }
2079
2080 void checkAutoCloseable(Env<AttrContext> env, JCTree tree, boolean useSite) {
2081 DiagnosticPosition pos = tree.pos();
2082 Type resource = tree.type;
2083 if (!resource.isErroneous() &&
2084 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2085 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2086 Symbol close = syms.noSymbol;
2087 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2088 try {
2089 close = rs.resolveQualifiedMethod(pos,
2090 env,
2091 types.skipTypeVars(resource, false),
2092 names.close,
2093 List.nil(),
2094 List.nil());
2095 }
2096 finally {
2097 log.popDiagnosticHandler(discardHandler);
2098 }
2099 if (close.kind == MTH &&
2100 (useSite || close.owner != syms.autoCloseableType.tsym) &&
2101 ((MethodSymbol)close).binaryOverrides(syms.autoCloseableClose, resource.tsym, types) &&
2102 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2103 if (!useSite && close.owner == resource.tsym) {
2104 log.warning(TreeInfo.diagnosticPositionFor(close, tree),
2105 LintWarnings.TryResourceCanThrowInterruptedExc(resource));
2106 } else {
2107 log.warning(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2108 }
2109 }
2110 }
2111 }
2112
2113 public void visitConditional(JCConditional tree) {
2114 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2115 MatchBindings condBindings = matchBindings;
2116
2117 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2118 isBooleanOrNumeric(env, tree)) ?
2119 PolyKind.STANDALONE : PolyKind.POLY;
2120
2121 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2122 //this means we are returning a poly conditional from void-compatible lambda expression
2123 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2124 result = tree.type = types.createErrorType(resultInfo.pt);
2125 return;
2126 }
2127
2128 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2129 unknownExprInfo :
2130 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2131
2132
2133 // x ? y : z
2134 // include x's bindings when true in y
2135 // include x's bindings when false in z
2136
2137 Type truetype;
2138 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2139 try {
2140 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2141 } finally {
2142 trueEnv.info.scope.leave();
2143 }
2144
2145 MatchBindings trueBindings = matchBindings;
2146
2147 Type falsetype;
2148 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2149 try {
2150 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2151 } finally {
2152 falseEnv.info.scope.leave();
2153 }
2154
2155 MatchBindings falseBindings = matchBindings;
2156
2157 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2158 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2159 List.of(truetype, falsetype)) : pt();
2160 if (condtype.constValue() != null &&
2161 truetype.constValue() != null &&
2162 falsetype.constValue() != null &&
2163 !owntype.hasTag(NONE)) {
2164 //constant folding
2165 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2166 }
2167 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2168 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2169 }
2170 //where
2171 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2172 switch (tree.getTag()) {
2173 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2174 ((JCLiteral)tree).typetag == BOOLEAN ||
2175 ((JCLiteral)tree).typetag == BOT;
2176 case LAMBDA: case REFERENCE: return false;
2177 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2178 case CONDEXPR:
2179 JCConditional condTree = (JCConditional)tree;
2180 return isBooleanOrNumeric(env, condTree.truepart) &&
2181 isBooleanOrNumeric(env, condTree.falsepart);
2182 case APPLY:
2183 JCMethodInvocation speculativeMethodTree =
2184 (JCMethodInvocation)deferredAttr.attribSpeculative(
2185 tree, env, unknownExprInfo,
2186 argumentAttr.withLocalCacheContext());
2187 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2188 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2189 env.enclClass.type :
2190 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2191 Type owntype = types.memberType(receiverType, msym).getReturnType();
2192 return primitiveOrBoxed(owntype);
2193 case NEWCLASS:
2194 JCExpression className =
2195 removeClassParams.translate(((JCNewClass)tree).clazz);
2196 JCExpression speculativeNewClassTree =
2197 (JCExpression)deferredAttr.attribSpeculative(
2198 className, env, unknownTypeInfo,
2199 argumentAttr.withLocalCacheContext());
2200 return primitiveOrBoxed(speculativeNewClassTree.type);
2201 default:
2202 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2203 argumentAttr.withLocalCacheContext()).type;
2204 return primitiveOrBoxed(speculativeType);
2205 }
2206 }
2207 //where
2208 boolean primitiveOrBoxed(Type t) {
2209 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2210 }
2211
2212 TreeTranslator removeClassParams = new TreeTranslator() {
2213 @Override
2214 public void visitTypeApply(JCTypeApply tree) {
2215 result = translate(tree.clazz);
2216 }
2217 };
2218
2219 CheckContext conditionalContext(CheckContext checkContext) {
2220 return new Check.NestedCheckContext(checkContext) {
2221 //this will use enclosing check context to check compatibility of
2222 //subexpression against target type; if we are in a method check context,
2223 //depending on whether boxing is allowed, we could have incompatibilities
2224 @Override
2225 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2226 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2227 }
2228 };
2229 }
2230
2231 /** Compute the type of a conditional expression, after
2232 * checking that it exists. See JLS 15.25. Does not take into
2233 * account the special case where condition and both arms
2234 * are constants.
2235 *
2236 * @param pos The source position to be used for error
2237 * diagnostics.
2238 * @param thentype The type of the expression's then-part.
2239 * @param elsetype The type of the expression's else-part.
2240 */
2241 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2242 if (condTypes.isEmpty()) {
2243 return syms.objectType; //TODO: how to handle?
2244 }
2245 Type first = condTypes.head;
2246 // If same type, that is the result
2247 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2248 return first.baseType();
2249
2250 List<Type> unboxedTypes = condTypes.stream()
2251 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2252 .collect(List.collector());
2253
2254 // Otherwise, if both arms can be converted to a numeric
2255 // type, return the least numeric type that fits both arms
2256 // (i.e. return larger of the two, or return int if one
2257 // arm is short, the other is char).
2258 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2259 // If one arm has an integer subrange type (i.e., byte,
2260 // short, or char), and the other is an integer constant
2261 // that fits into the subrange, return the subrange type.
2262 for (Type type : unboxedTypes) {
2263 if (!type.getTag().isStrictSubRangeOf(INT)) {
2264 continue;
2265 }
2266 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2267 return type.baseType();
2268 }
2269
2270 for (TypeTag tag : primitiveTags) {
2271 Type candidate = syms.typeOfTag[tag.ordinal()];
2272 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2273 return candidate;
2274 }
2275 }
2276 }
2277
2278 // Those were all the cases that could result in a primitive
2279 condTypes = condTypes.stream()
2280 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2281 .collect(List.collector());
2282
2283 for (Type type : condTypes) {
2284 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isSubtype(t, type)))
2285 return type.baseType();
2286 }
2287
2288 Iterator<DiagnosticPosition> posIt = positions.iterator();
2289
2290 condTypes = condTypes.stream()
2291 .map(t -> chk.checkNonVoid(posIt.next(), t))
2292 .collect(List.collector());
2293
2294 // both are known to be reference types. The result is
2295 // lub(thentype,elsetype). This cannot fail, as it will
2296 // always be possible to infer "Object" if nothing better.
2297 return types.lub(condTypes.stream()
2298 .map(t -> t.baseType())
2299 .filter(t -> !t.hasTag(BOT))
2300 .collect(List.collector()));
2301 }
2302
2303 static final TypeTag[] primitiveTags = new TypeTag[]{
2304 BYTE,
2305 CHAR,
2306 SHORT,
2307 INT,
2308 LONG,
2309 FLOAT,
2310 DOUBLE,
2311 BOOLEAN,
2312 };
2313
2314 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2315 return bindingEnv(env, env.tree, bindings);
2316 }
2317
2318 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2319 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2320 bindings.forEach(env1.info.scope::enter);
2321 return env1;
2322 }
2323
2324 public void visitIf(JCIf tree) {
2325 attribExpr(tree.cond, env, syms.booleanType);
2326
2327 // if (x) { y } [ else z ]
2328 // include x's bindings when true in y
2329 // include x's bindings when false in z
2330
2331 MatchBindings condBindings = matchBindings;
2332 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2333
2334 try {
2335 attribStat(tree.thenpart, thenEnv);
2336 } finally {
2337 thenEnv.info.scope.leave();
2338 }
2339
2340 preFlow(tree.thenpart);
2341 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2342 boolean aliveAfterElse;
2343
2344 if (tree.elsepart != null) {
2345 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2346 try {
2347 attribStat(tree.elsepart, elseEnv);
2348 } finally {
2349 elseEnv.info.scope.leave();
2350 }
2351 preFlow(tree.elsepart);
2352 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2353 } else {
2354 aliveAfterElse = true;
2355 }
2356
2357 chk.checkEmptyIf(tree);
2358
2359 List<BindingSymbol> afterIfBindings = List.nil();
2360
2361 if (aliveAfterThen && !aliveAfterElse) {
2362 afterIfBindings = condBindings.bindingsWhenTrue;
2363 } else if (aliveAfterElse && !aliveAfterThen) {
2364 afterIfBindings = condBindings.bindingsWhenFalse;
2365 }
2366
2367 addBindings2Scope(tree, afterIfBindings);
2368
2369 result = null;
2370 }
2371
2372 void preFlow(JCTree tree) {
2373 attrRecover.doRecovery();
2374 new PostAttrAnalyzer() {
2375 @Override
2376 public void scan(JCTree tree) {
2377 if (tree == null ||
2378 (tree.type != null &&
2379 tree.type == Type.stuckType)) {
2380 //don't touch stuck expressions!
2381 return;
2382 }
2383 super.scan(tree);
2384 }
2385
2386 @Override
2387 public void visitClassDef(JCClassDecl that) {
2388 if (that.sym != null) {
2389 // Method preFlow shouldn't visit class definitions
2390 // that have not been entered and attributed.
2391 // See JDK-8254557 and JDK-8203277 for more details.
2392 super.visitClassDef(that);
2393 }
2394 }
2395
2396 @Override
2397 public void visitLambda(JCLambda that) {
2398 if (that.type != null) {
2399 // Method preFlow shouldn't visit lambda expressions
2400 // that have not been entered and attributed.
2401 // See JDK-8254557 and JDK-8203277 for more details.
2402 super.visitLambda(that);
2403 }
2404 }
2405 }.scan(tree);
2406 }
2407
2408 public void visitExec(JCExpressionStatement tree) {
2409 //a fresh environment is required for 292 inference to work properly ---
2410 //see Infer.instantiatePolymorphicSignatureInstance()
2411 Env<AttrContext> localEnv = env.dup(tree);
2412 attribExpr(tree.expr, localEnv);
2413 result = null;
2414 }
2415
2416 public void visitBreak(JCBreak tree) {
2417 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2418 result = null;
2419 }
2420
2421 public void visitYield(JCYield tree) {
2422 if (env.info.yieldResult != null) {
2423 attribTree(tree.value, env, env.info.yieldResult);
2424 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2425 } else {
2426 log.error(tree.pos(), tree.value.hasTag(PARENS)
2427 ? Errors.NoSwitchExpressionQualify
2428 : Errors.NoSwitchExpression);
2429 attribTree(tree.value, env, unknownExprInfo);
2430 }
2431 result = null;
2432 }
2433
2434 public void visitContinue(JCContinue tree) {
2435 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2436 result = null;
2437 }
2438 //where
2439 /** Return the target of a break, continue or yield statement,
2440 * if it exists, report an error if not.
2441 * Note: The target of a labelled break or continue is the
2442 * (non-labelled) statement tree referred to by the label,
2443 * not the tree representing the labelled statement itself.
2444 *
2445 * @param pos The position to be used for error diagnostics
2446 * @param tag The tag of the jump statement. This is either
2447 * Tree.BREAK or Tree.CONTINUE.
2448 * @param label The label of the jump statement, or null if no
2449 * label is given.
2450 * @param env The environment current at the jump statement.
2451 */
2452 private JCTree findJumpTarget(DiagnosticPosition pos,
2453 JCTree.Tag tag,
2454 Name label,
2455 Env<AttrContext> env) {
2456 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2457
2458 if (jumpTarget.snd != null) {
2459 log.error(pos, jumpTarget.snd);
2460 }
2461
2462 return jumpTarget.fst;
2463 }
2464 /** Return the target of a break or continue statement, if it exists,
2465 * report an error if not.
2466 * Note: The target of a labelled break or continue is the
2467 * (non-labelled) statement tree referred to by the label,
2468 * not the tree representing the labelled statement itself.
2469 *
2470 * @param tag The tag of the jump statement. This is either
2471 * Tree.BREAK or Tree.CONTINUE.
2472 * @param label The label of the jump statement, or null if no
2473 * label is given.
2474 * @param env The environment current at the jump statement.
2475 */
2476 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2477 Name label,
2478 Env<AttrContext> env) {
2479 // Search environments outwards from the point of jump.
2480 Env<AttrContext> env1 = env;
2481 JCDiagnostic.Error pendingError = null;
2482 LOOP:
2483 while (env1 != null) {
2484 switch (env1.tree.getTag()) {
2485 case LABELLED:
2486 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2487 if (label == labelled.label) {
2488 // If jump is a continue, check that target is a loop.
2489 if (tag == CONTINUE) {
2490 if (!labelled.body.hasTag(DOLOOP) &&
2491 !labelled.body.hasTag(WHILELOOP) &&
2492 !labelled.body.hasTag(FORLOOP) &&
2493 !labelled.body.hasTag(FOREACHLOOP)) {
2494 pendingError = Errors.NotLoopLabel(label);
2495 }
2496 // Found labelled statement target, now go inwards
2497 // to next non-labelled tree.
2498 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2499 } else {
2500 return Pair.of(labelled, pendingError);
2501 }
2502 }
2503 break;
2504 case DOLOOP:
2505 case WHILELOOP:
2506 case FORLOOP:
2507 case FOREACHLOOP:
2508 if (label == null) return Pair.of(env1.tree, pendingError);
2509 break;
2510 case SWITCH:
2511 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2512 break;
2513 case SWITCH_EXPRESSION:
2514 if (tag == YIELD) {
2515 return Pair.of(env1.tree, null);
2516 } else if (tag == BREAK) {
2517 pendingError = Errors.BreakOutsideSwitchExpression;
2518 } else {
2519 pendingError = Errors.ContinueOutsideSwitchExpression;
2520 }
2521 break;
2522 case LAMBDA:
2523 case METHODDEF:
2524 case CLASSDEF:
2525 break LOOP;
2526 default:
2527 }
2528 env1 = env1.next;
2529 }
2530 if (label != null)
2531 return Pair.of(null, Errors.UndefLabel(label));
2532 else if (pendingError != null)
2533 return Pair.of(null, pendingError);
2534 else if (tag == CONTINUE)
2535 return Pair.of(null, Errors.ContOutsideLoop);
2536 else
2537 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2538 }
2539
2540 public void visitReturn(JCReturn tree) {
2541 // Check that there is an enclosing method which is
2542 // nested within than the enclosing class.
2543 if (env.info.returnResult == null) {
2544 log.error(tree.pos(), Errors.RetOutsideMeth);
2545 } else if (env.info.yieldResult != null) {
2546 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2547 if (tree.expr != null) {
2548 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2549 }
2550 } else if (!env.info.isLambda &&
2551 env.enclMethod != null &&
2552 TreeInfo.isCompactConstructor(env.enclMethod)) {
2553 log.error(env.enclMethod,
2554 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2555 } else {
2556 // Attribute return expression, if it exists, and check that
2557 // it conforms to result type of enclosing method.
2558 if (tree.expr != null) {
2559 if (env.info.returnResult.pt.hasTag(VOID)) {
2560 env.info.returnResult.checkContext.report(tree.expr.pos(),
2561 diags.fragment(Fragments.UnexpectedRetVal));
2562 }
2563 attribTree(tree.expr, env, env.info.returnResult);
2564 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2565 !env.info.returnResult.pt.hasTag(NONE)) {
2566 env.info.returnResult.checkContext.report(tree.pos(),
2567 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2568 }
2569 }
2570 result = null;
2571 }
2572
2573 public void visitThrow(JCThrow tree) {
2574 Type owntype = attribExpr(tree.expr, env, Type.noType);
2575 chk.checkType(tree, owntype, syms.throwableType);
2576 result = null;
2577 }
2578
2579 public void visitAssert(JCAssert tree) {
2580 attribExpr(tree.cond, env, syms.booleanType);
2581 if (tree.detail != null) {
2582 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2583 }
2584 result = null;
2585 }
2586
2587 /** Visitor method for method invocations.
2588 * NOTE: The method part of an application will have in its type field
2589 * the return type of the method, not the method's type itself!
2590 */
2591 public void visitApply(JCMethodInvocation tree) {
2592 // The local environment of a method application is
2593 // a new environment nested in the current one.
2594 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2595
2596 // The types of the actual method arguments.
2597 List<Type> argtypes;
2598
2599 // The types of the actual method type arguments.
2600 List<Type> typeargtypes = null;
2601
2602 Name methName = TreeInfo.name(tree.meth);
2603
2604 boolean isConstructorCall =
2605 methName == names._this || methName == names._super;
2606
2607 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2608 if (isConstructorCall) {
2609
2610 // Attribute arguments, yielding list of argument types.
2611 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2612 argtypes = argtypesBuf.toList();
2613 typeargtypes = attribTypes(tree.typeargs, localEnv);
2614
2615 // End of constructor prologue. Done with this()/super() parameters.
2616 env.info.earlyContext = EarlyConstructionContext.NONE;
2617
2618 // Variable `site' points to the class in which the called
2619 // constructor is defined.
2620 Type site = env.enclClass.sym.type;
2621 if (methName == names._super) {
2622 if (site == syms.objectType) {
2623 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2624 site = types.createErrorType(syms.objectType);
2625 } else {
2626 site = types.supertype(site);
2627 }
2628 }
2629
2630 if (site.hasTag(CLASS)) {
2631 Type encl = site.getEnclosingType();
2632 while (encl != null && encl.hasTag(TYPEVAR))
2633 encl = encl.getUpperBound();
2634 if (encl.hasTag(CLASS)) {
2635 // we are calling a nested class
2636
2637 if (tree.meth.hasTag(SELECT)) {
2638 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2639
2640 // We are seeing a prefixed call, of the form
2641 // <expr>.super(...).
2642 // Check that the prefix expression conforms
2643 // to the outer instance type of the class.
2644 chk.checkRefType(qualifier.pos(),
2645 attribTree(qualifier, localEnv,
2646 new ResultInfo(KindSelector.VAL,
2647 encl,
2648 chk.subtypeHandler)));
2649 }
2650 } else if (tree.meth.hasTag(SELECT)) {
2651 log.error(tree.meth.pos(),
2652 Errors.IllegalQualNotIcls(site.tsym));
2653 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2654 }
2655
2656 if (tree.meth.hasTag(IDENT)) {
2657 // non-qualified super(...) call; check whether explicit constructor
2658 // invocation is well-formed. If the super class is an inner class,
2659 // make sure that an appropriate implicit qualifier exists. If the super
2660 // class is a local class, make sure that the current class is defined
2661 // in the same context as the local class.
2662 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2663 }
2664
2665 // if we're calling a java.lang.Enum constructor,
2666 // prefix the implicit String and int parameters
2667 if (site.tsym == syms.enumSym)
2668 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2669
2670 // Resolve the called constructor under the assumption
2671 // that we are referring to a superclass instance of the
2672 // current instance (JLS ???).
2673 boolean selectSuperPrev = localEnv.info.selectSuper;
2674 localEnv.info.selectSuper = true;
2675 localEnv.info.pendingResolutionPhase = null;
2676 Symbol sym = rs.resolveConstructor(
2677 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2678 localEnv.info.selectSuper = selectSuperPrev;
2679
2680 // Set method symbol to resolved constructor...
2681 TreeInfo.setSymbol(tree.meth, sym);
2682
2683 // ...and check that it is legal in the current context.
2684 // (this will also set the tree's type)
2685 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2686 checkId(tree.meth, site, sym, localEnv,
2687 new ResultInfo(kind, mpt));
2688 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2689 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2690 }
2691 // Otherwise, `site' is an error type and we do nothing
2692 result = tree.type = syms.voidType;
2693 } else {
2694 // Otherwise, we are seeing a regular method call.
2695 // Attribute the arguments, yielding list of argument types, ...
2696 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2697 argtypes = argtypesBuf.toList();
2698 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2699
2700 // ... and attribute the method using as a prototype a methodtype
2701 // whose formal argument types is exactly the list of actual
2702 // arguments (this will also set the method symbol).
2703 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2704 localEnv.info.pendingResolutionPhase = null;
2705 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2706
2707 // Compute the result type.
2708 Type restype = mtype.getReturnType();
2709 if (restype.hasTag(WILDCARD))
2710 throw new AssertionError(mtype);
2711
2712 Type qualifier = (tree.meth.hasTag(SELECT))
2713 ? ((JCFieldAccess) tree.meth).selected.type
2714 : env.enclClass.sym.type;
2715 Symbol msym = TreeInfo.symbol(tree.meth);
2716 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2717
2718 chk.checkRefTypes(tree.typeargs, typeargtypes);
2719
2720 // Check that value of resulting type is admissible in the
2721 // current context. Also, capture the return type
2722 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2723 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2724 }
2725 chk.checkRequiresIdentity(tree, env.info.lint);
2726 chk.validate(tree.typeargs, localEnv);
2727 }
2728 //where
2729 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2730 if (msym != null &&
2731 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2732 methodName == names.getClass &&
2733 argtypes.isEmpty()) {
2734 // as a special case, x.getClass() has type Class<? extends |X|>
2735 return new ClassType(restype.getEnclosingType(),
2736 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2737 BoundKind.EXTENDS,
2738 syms.boundClass)),
2739 restype.tsym,
2740 restype.getMetadata());
2741 } else if (msym != null &&
2742 msym.owner == syms.arrayClass &&
2743 methodName == names.clone &&
2744 types.isArray(qualifierType)) {
2745 // as a special case, array.clone() has a result that is
2746 // the same as static type of the array being cloned
2747 return qualifierType;
2748 } else {
2749 return restype;
2750 }
2751 }
2752
2753 /** Obtain a method type with given argument types.
2754 */
2755 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2756 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2757 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2758 }
2759
2760 public void visitNewClass(final JCNewClass tree) {
2761 Type owntype = types.createErrorType(tree.type);
2762
2763 // The local environment of a class creation is
2764 // a new environment nested in the current one.
2765 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2766
2767 // The anonymous inner class definition of the new expression,
2768 // if one is defined by it.
2769 JCClassDecl cdef = tree.def;
2770
2771 // If enclosing class is given, attribute it, and
2772 // complete class name to be fully qualified
2773 JCExpression clazz = tree.clazz; // Class field following new
2774 JCExpression clazzid; // Identifier in class field
2775 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2776 annoclazzid = null;
2777
2778 if (clazz.hasTag(TYPEAPPLY)) {
2779 clazzid = ((JCTypeApply) clazz).clazz;
2780 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2781 annoclazzid = (JCAnnotatedType) clazzid;
2782 clazzid = annoclazzid.underlyingType;
2783 }
2784 } else {
2785 if (clazz.hasTag(ANNOTATED_TYPE)) {
2786 annoclazzid = (JCAnnotatedType) clazz;
2787 clazzid = annoclazzid.underlyingType;
2788 } else {
2789 clazzid = clazz;
2790 }
2791 }
2792
2793 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2794
2795 if (tree.encl != null) {
2796 // We are seeing a qualified new, of the form
2797 // <expr>.new C <...> (...) ...
2798 // In this case, we let clazz stand for the name of the
2799 // allocated class C prefixed with the type of the qualifier
2800 // expression, so that we can
2801 // resolve it with standard techniques later. I.e., if
2802 // <expr> has type T, then <expr>.new C <...> (...)
2803 // yields a clazz T.C.
2804 Type encltype = chk.checkRefType(tree.encl.pos(),
2805 attribExpr(tree.encl, env));
2806 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2807 // from expr to the combined type, or not? Yes, do this.
2808 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2809 ((JCIdent) clazzid).name);
2810
2811 clazzid1.endpos = clazzid.getEndPosition();
2812 if (clazz.hasTag(ANNOTATED_TYPE)) {
2813 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2814 List<JCAnnotation> annos = annoType.annotations;
2815
2816 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2817 clazzid1 = make.at(tree.pos).
2818 TypeApply(clazzid1,
2819 ((JCTypeApply) clazz).arguments);
2820 }
2821
2822 clazzid1 = make.at(tree.pos).
2823 AnnotatedType(annos, clazzid1);
2824 } else if (clazz.hasTag(TYPEAPPLY)) {
2825 clazzid1 = make.at(tree.pos).
2826 TypeApply(clazzid1,
2827 ((JCTypeApply) clazz).arguments);
2828 }
2829
2830 clazz = clazzid1;
2831 }
2832
2833 // Attribute clazz expression and store
2834 // symbol + type back into the attributed tree.
2835 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
2836 attribIdentAsEnumType(env, (JCIdent)clazz) :
2837 attribType(clazz, env);
2838
2839 clazztype = chk.checkDiamond(tree, clazztype);
2840 chk.validate(clazz, localEnv);
2841 if (tree.encl != null) {
2842 // We have to work in this case to store
2843 // symbol + type back into the attributed tree.
2844 tree.clazz.type = clazztype;
2845 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2846 clazzid.type = ((JCIdent) clazzid).sym.type;
2847 if (annoclazzid != null) {
2848 annoclazzid.type = clazzid.type;
2849 }
2850 if (!clazztype.isErroneous()) {
2851 if (cdef != null && clazztype.tsym.isInterface()) {
2852 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2853 } else if (clazztype.tsym.isStatic()) {
2854 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2855 }
2856 }
2857 } else {
2858 // Check for the existence of an apropos outer instance
2859 checkNewInnerClass(tree.pos(), env, clazztype, false);
2860 }
2861
2862 checkBreakTree(tree.clazz, localEnv);
2863
2864 // Attribute constructor arguments.
2865 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2866 final KindSelector pkind =
2867 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2868 List<Type> argtypes = argtypesBuf.toList();
2869 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2870
2871 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2872 // Enums may not be instantiated except implicitly
2873 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2874 (!env.tree.hasTag(VARDEF) ||
2875 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2876 ((JCVariableDecl) env.tree).init != tree))
2877 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2878
2879 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2880 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2881 boolean skipNonDiamondPath = false;
2882 // Check that class is not abstract
2883 if (cdef == null && !tree.classDeclRemoved() && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2884 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2885 log.error(tree.pos(),
2886 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2887 skipNonDiamondPath = true;
2888 } else if (cdef != null && clazztype.tsym.isInterface()) {
2889 // Check that no constructor arguments are given to
2890 // anonymous classes implementing an interface
2891 if (!argtypes.isEmpty())
2892 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2893
2894 if (!typeargtypes.isEmpty())
2895 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2896
2897 // Error recovery: pretend no arguments were supplied.
2898 argtypes = List.nil();
2899 typeargtypes = List.nil();
2900 skipNonDiamondPath = true;
2901 }
2902 if (TreeInfo.isDiamond(tree)) {
2903 ClassType site = new ClassType(clazztype.getEnclosingType(),
2904 clazztype.tsym.type.getTypeArguments(),
2905 clazztype.tsym,
2906 clazztype.getMetadata());
2907
2908 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2909 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2910 diamondEnv.info.pendingResolutionPhase = null;
2911
2912 //if the type of the instance creation expression is a class type
2913 //apply method resolution inference (JLS 15.12.2.7). The return type
2914 //of the resolved constructor will be a partially instantiated type
2915 Symbol constructor = rs.resolveDiamond(tree.pos(),
2916 diamondEnv,
2917 site,
2918 argtypes,
2919 typeargtypes);
2920 tree.constructor = constructor.baseSymbol();
2921
2922 final TypeSymbol csym = clazztype.tsym;
2923 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2924 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2925 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2926 constructorType = checkId(tree, site,
2927 constructor,
2928 diamondEnv,
2929 diamondResult);
2930
2931 tree.clazz.type = types.createErrorType(clazztype);
2932 if (!constructorType.isErroneous()) {
2933 tree.clazz.type = clazz.type = constructorType.getReturnType();
2934 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2935 }
2936 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2937 }
2938
2939 // Resolve the called constructor under the assumption
2940 // that we are referring to a superclass instance of the
2941 // current instance (JLS ???).
2942 else if (!skipNonDiamondPath) {
2943 //the following code alters some of the fields in the current
2944 //AttrContext - hence, the current context must be dup'ed in
2945 //order to avoid downstream failures
2946 Env<AttrContext> rsEnv = localEnv.dup(tree);
2947 rsEnv.info.selectSuper = cdef != null;
2948 rsEnv.info.pendingResolutionPhase = null;
2949 tree.constructor = rs.resolveConstructor(
2950 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2951 if (cdef == null) { //do not check twice!
2952 tree.constructorType = checkId(tree,
2953 clazztype,
2954 tree.constructor,
2955 rsEnv,
2956 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2957 if (rsEnv.info.lastResolveVarargs())
2958 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2959 }
2960 }
2961
2962 chk.checkRequiresIdentity(tree, env.info.lint);
2963
2964 if (cdef != null) {
2965 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2966 return;
2967 }
2968
2969 if (tree.constructor != null && tree.constructor.kind == MTH)
2970 owntype = clazztype;
2971 }
2972 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2973 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2974 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2975 //we need to wait for inference to finish and then replace inference vars in the constructor type
2976 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2977 instantiatedContext -> {
2978 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2979 });
2980 }
2981 chk.validate(tree.typeargs, localEnv);
2982 }
2983
2984 // where
2985 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2986 JCClassDecl cdef, Env<AttrContext> localEnv,
2987 List<Type> argtypes, List<Type> typeargtypes,
2988 KindSelector pkind) {
2989 // We are seeing an anonymous class instance creation.
2990 // In this case, the class instance creation
2991 // expression
2992 //
2993 // E.new <typeargs1>C<typargs2>(args) { ... }
2994 //
2995 // is represented internally as
2996 //
2997 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2998 //
2999 // This expression is then *transformed* as follows:
3000 //
3001 // (1) add an extends or implements clause
3002 // (2) add a constructor.
3003 //
3004 // For instance, if C is a class, and ET is the type of E,
3005 // the expression
3006 //
3007 // E.new <typeargs1>C<typargs2>(args) { ... }
3008 //
3009 // is translated to (where X is a fresh name and typarams is the
3010 // parameter list of the super constructor):
3011 //
3012 // new <typeargs1>X(<*nullchk*>E, args) where
3013 // X extends C<typargs2> {
3014 // <typarams> X(ET e, args) {
3015 // e.<typeargs1>super(args)
3016 // }
3017 // ...
3018 // }
3019 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3020 Type enclType = clazztype.getEnclosingType();
3021 if (enclType != null &&
3022 enclType.hasTag(CLASS) &&
3023 !chk.checkDenotable((ClassType)enclType)) {
3024 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
3025 }
3026 final boolean isDiamond = TreeInfo.isDiamond(tree);
3027 if (isDiamond
3028 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3029 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3030 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3031 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3032 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3033 instantiatedContext -> {
3034 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3035 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3036 ResultInfo prevResult = this.resultInfo;
3037 try {
3038 this.resultInfo = resultInfoForClassDefinition;
3039 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3040 dupLocalEnv, argtypes, typeargtypes, pkind);
3041 } finally {
3042 this.resultInfo = prevResult;
3043 }
3044 });
3045 } else {
3046 if (isDiamond && clazztype.hasTag(CLASS)) {
3047 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3048 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3049 // One or more types inferred in the previous steps is non-denotable.
3050 Fragment fragment = Diamond(clazztype.tsym);
3051 log.error(tree.clazz.pos(),
3052 Errors.CantApplyDiamond1(
3053 fragment,
3054 invalidDiamondArgs.size() > 1 ?
3055 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3056 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3057 }
3058 // For <>(){}, inferred types must also be accessible.
3059 for (Type t : clazztype.getTypeArguments()) {
3060 rs.checkAccessibleType(env, t);
3061 }
3062 }
3063
3064 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3065 // false for isInterface call even when the original type is an interface.
3066 boolean implementing = clazztype.tsym.isInterface() ||
3067 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3068 clazztype.getOriginalType().tsym.isInterface();
3069
3070 if (implementing) {
3071 cdef.implementing = List.of(clazz);
3072 } else {
3073 cdef.extending = clazz;
3074 }
3075
3076 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3077 rs.isSerializable(clazztype)) {
3078 localEnv.info.isSerializable = true;
3079 }
3080
3081 attribStat(cdef, localEnv);
3082
3083 List<Type> finalargtypes;
3084 // If an outer instance is given,
3085 // prefix it to the constructor arguments
3086 // and delete it from the new expression
3087 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3088 finalargtypes = argtypes.prepend(tree.encl.type);
3089 } else {
3090 finalargtypes = argtypes;
3091 }
3092
3093 // Reassign clazztype and recompute constructor. As this necessarily involves
3094 // another attribution pass for deferred types in the case of <>, replicate
3095 // them. Original arguments have right decorations already.
3096 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3097 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3098 }
3099
3100 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3101 : cdef.sym.type;
3102 Symbol sym = tree.constructor = rs.resolveConstructor(
3103 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3104 Assert.check(!sym.kind.isResolutionError());
3105 tree.constructor = sym;
3106 tree.constructorType = checkId(tree,
3107 clazztype,
3108 tree.constructor,
3109 localEnv,
3110 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3111 }
3112 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3113 clazztype : types.createErrorType(tree.type);
3114 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3115 chk.validate(tree.typeargs, localEnv);
3116 }
3117
3118 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3119 return new Check.NestedCheckContext(checkContext) {
3120 @Override
3121 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3122 enclosingContext.report(clazz.clazz,
3123 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3124 }
3125 };
3126 }
3127
3128 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3129 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3130 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3131 (!isLocal && !type.tsym.isInner()) ||
3132 (isSuper && env.enclClass.sym.isAnonymous())) {
3133 // nothing to check
3134 return;
3135 }
3136 Symbol res = isLocal ?
3137 rs.findLocalClassOwner(env, type.tsym) :
3138 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3139 if (res.exists()) {
3140 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3141 } else {
3142 log.error(pos, Errors.EnclClassRequired(type.tsym));
3143 }
3144 }
3145
3146 /** Make an attributed null check tree.
3147 */
3148 public JCExpression makeNullCheck(JCExpression arg) {
3149 // optimization: new Outer() can never be null; skip null check
3150 if (arg.getTag() == NEWCLASS)
3151 return arg;
3152 // optimization: X.this is never null; skip null check
3153 Name name = TreeInfo.name(arg);
3154 if (name == names._this || name == names._super) return arg;
3155
3156 JCTree.Tag optag = NULLCHK;
3157 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3158 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3159 tree.type = arg.type;
3160 return tree;
3161 }
3162
3163 public void visitNewArray(JCNewArray tree) {
3164 Type owntype = types.createErrorType(tree.type);
3165 Env<AttrContext> localEnv = env.dup(tree);
3166 Type elemtype;
3167 if (tree.elemtype != null) {
3168 elemtype = attribType(tree.elemtype, localEnv);
3169 chk.validate(tree.elemtype, localEnv);
3170 owntype = elemtype;
3171 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3172 attribExpr(l.head, localEnv, syms.intType);
3173 owntype = new ArrayType(owntype, syms.arrayClass);
3174 }
3175 } else {
3176 // we are seeing an untyped aggregate { ... }
3177 // this is allowed only if the prototype is an array
3178 if (pt().hasTag(ARRAY)) {
3179 elemtype = types.elemtype(pt());
3180 } else {
3181 if (!pt().hasTag(ERROR) &&
3182 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3183 log.error(tree.pos(),
3184 Errors.IllegalInitializerForType(pt()));
3185 }
3186 elemtype = types.createErrorType(pt());
3187 }
3188 }
3189 if (tree.elems != null) {
3190 attribExprs(tree.elems, localEnv, elemtype);
3191 owntype = new ArrayType(elemtype, syms.arrayClass);
3192 }
3193 if (!types.isReifiable(elemtype))
3194 log.error(tree.pos(), Errors.GenericArrayCreation);
3195 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3196 }
3197
3198 /*
3199 * A lambda expression can only be attributed when a target-type is available.
3200 * In addition, if the target-type is that of a functional interface whose
3201 * descriptor contains inference variables in argument position the lambda expression
3202 * is 'stuck' (see DeferredAttr).
3203 */
3204 @Override
3205 public void visitLambda(final JCLambda that) {
3206 boolean wrongContext = false;
3207 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3208 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3209 //lambda only allowed in assignment or method invocation/cast context
3210 log.error(that.pos(), Errors.UnexpectedLambda);
3211 }
3212 resultInfo = recoveryInfo;
3213 wrongContext = true;
3214 }
3215 //create an environment for attribution of the lambda expression
3216 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3217 boolean needsRecovery =
3218 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3219 try {
3220 if (needsRecovery && rs.isSerializable(pt())) {
3221 localEnv.info.isSerializable = true;
3222 localEnv.info.isSerializableLambda = true;
3223 }
3224 List<Type> explicitParamTypes = null;
3225 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3226 //attribute lambda parameters
3227 attribStats(that.params, localEnv);
3228 explicitParamTypes = TreeInfo.types(that.params);
3229 }
3230
3231 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3232 Type currentTarget = targetInfo.target;
3233 Type lambdaType = targetInfo.descriptor;
3234
3235 if (currentTarget.isErroneous()) {
3236 result = that.type = currentTarget;
3237 return;
3238 }
3239
3240 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3241
3242 if (lambdaType.hasTag(FORALL)) {
3243 //lambda expression target desc cannot be a generic method
3244 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3245 kindName(currentTarget.tsym),
3246 currentTarget.tsym);
3247 resultInfo.checkContext.report(that, diags.fragment(msg));
3248 result = that.type = types.createErrorType(pt());
3249 return;
3250 }
3251
3252 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3253 //add param type info in the AST
3254 List<Type> actuals = lambdaType.getParameterTypes();
3255 List<JCVariableDecl> params = that.params;
3256
3257 boolean arityMismatch = false;
3258
3259 while (params.nonEmpty()) {
3260 if (actuals.isEmpty()) {
3261 //not enough actuals to perform lambda parameter inference
3262 arityMismatch = true;
3263 }
3264 //reset previously set info
3265 Type argType = arityMismatch ?
3266 syms.errType :
3267 actuals.head;
3268 if (params.head.type == null &&
3269 params.head.isImplicitlyTyped()) { //error recovery
3270 params.head.type = argType;
3271 setupImplicitlyTypedVariable(params.head, argType);
3272 }
3273 params.head.sym = null;
3274 actuals = actuals.isEmpty() ?
3275 actuals :
3276 actuals.tail;
3277 params = params.tail;
3278 }
3279
3280 //attribute lambda parameters
3281 attribStats(that.params, localEnv);
3282
3283 if (arityMismatch) {
3284 resultInfo.checkContext.report(that, diags.fragment(Fragments.WrongNumberArgsInLambda(currentTarget.tsym)));
3285 result = that.type = types.createErrorType(currentTarget);
3286 return;
3287 }
3288 }
3289
3290 //from this point on, no recovery is needed; if we are in assignment context
3291 //we will be able to attribute the whole lambda body, regardless of errors;
3292 //if we are in a 'check' method context, and the lambda is not compatible
3293 //with the target-type, it will be recovered anyway in Attr.checkId
3294 needsRecovery = false;
3295
3296 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3297 lambdaBodyResult(that, lambdaType, resultInfo);
3298
3299 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3300 attribTree(that.getBody(), localEnv, bodyResultInfo);
3301 } else {
3302 JCBlock body = (JCBlock)that.body;
3303
3304 checkBreakTree(body, localEnv);
3305 attribStats(body.stats, localEnv);
3306 }
3307
3308 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3309
3310 boolean isSpeculativeRound =
3311 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3312
3313 preFlow(that);
3314 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3315
3316 that.type = currentTarget; //avoids recovery at this stage
3317 checkLambdaCompatible(that, lambdaType, currentTarget.tsym, resultInfo.checkContext);
3318
3319 if (!isSpeculativeRound) {
3320 //add thrown types as bounds to the thrown types free variables if needed:
3321 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3322 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3323 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3324 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3325 }
3326 }
3327
3328 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3329 }
3330 result = wrongContext ? that.type = types.createErrorType(pt())
3331 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3332 } catch (Types.FunctionDescriptorLookupError ex) {
3333 JCDiagnostic cause = ex.getDiagnostic();
3334 resultInfo.checkContext.report(that, cause);
3335 result = that.type = types.createErrorType(pt());
3336 return;
3337 } catch (CompletionFailure cf) {
3338 chk.completionError(that.pos(), cf);
3339 } catch (Throwable t) {
3340 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3341 //as that would likely cause the same exception again.
3342 needsRecovery = false;
3343 throw t;
3344 } finally {
3345 localEnv.info.scope.leave();
3346 if (needsRecovery) {
3347 Type prevResult = result;
3348 try {
3349 attribTree(that, env, recoveryInfo);
3350 } finally {
3351 if (result == Type.recoveryType) {
3352 result = prevResult;
3353 }
3354 }
3355 }
3356 }
3357 }
3358 //where
3359 class TargetInfo {
3360 Type target;
3361 Type descriptor;
3362
3363 public TargetInfo(Type target, Type descriptor) {
3364 this.target = target;
3365 this.descriptor = descriptor;
3366 }
3367 }
3368
3369 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3370 Type lambdaType;
3371 Type currentTarget = resultInfo.pt;
3372 if (resultInfo.pt != Type.recoveryType) {
3373 /* We need to adjust the target. If the target is an
3374 * intersection type, for example: SAM & I1 & I2 ...
3375 * the target will be updated to SAM
3376 */
3377 currentTarget = targetChecker.visit(currentTarget, that);
3378 if (!currentTarget.isIntersection()) {
3379 if (explicitParamTypes != null) {
3380 currentTarget = infer.instantiateFunctionalInterface(that,
3381 currentTarget, explicitParamTypes, resultInfo.checkContext);
3382 }
3383 currentTarget = types.removeWildcards(currentTarget);
3384 lambdaType = types.findDescriptorType(currentTarget);
3385 } else {
3386 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3387 ListBuffer<Type> components = new ListBuffer<>();
3388 for (Type bound : ict.getExplicitComponents()) {
3389 if (explicitParamTypes != null) {
3390 try {
3391 bound = infer.instantiateFunctionalInterface(that,
3392 bound, explicitParamTypes, resultInfo.checkContext);
3393 } catch (FunctionDescriptorLookupError t) {
3394 // do nothing
3395 }
3396 }
3397 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3398 // bound must be j.l.Object or an interface, but not an annotation
3399 reportIntersectionError(that, "not.an.intf.component", bound);
3400 }
3401 bound = types.removeWildcards(bound);
3402 components.add(bound);
3403 }
3404 currentTarget = types.makeIntersectionType(components.toList());
3405 currentTarget.tsym.flags_field |= INTERFACE;
3406 lambdaType = types.findDescriptorType(currentTarget);
3407 }
3408
3409 } else {
3410 currentTarget = Type.recoveryType;
3411 lambdaType = fallbackDescriptorType(that);
3412 }
3413 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3414 //lambda expression target desc cannot be a generic method
3415 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3416 kindName(currentTarget.tsym),
3417 currentTarget.tsym);
3418 resultInfo.checkContext.report(that, diags.fragment(msg));
3419 currentTarget = types.createErrorType(pt());
3420 }
3421 return new TargetInfo(currentTarget, lambdaType);
3422 }
3423
3424 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3425 resultInfo.checkContext.report(pos,
3426 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3427 }
3428
3429 void preFlow(JCLambda tree) {
3430 attrRecover.doRecovery();
3431 new PostAttrAnalyzer() {
3432 @Override
3433 public void scan(JCTree tree) {
3434 if (tree == null ||
3435 (tree.type != null &&
3436 tree.type == Type.stuckType)) {
3437 //don't touch stuck expressions!
3438 return;
3439 }
3440 super.scan(tree);
3441 }
3442
3443 @Override
3444 public void visitClassDef(JCClassDecl that) {
3445 // or class declaration trees!
3446 }
3447
3448 public void visitLambda(JCLambda that) {
3449 // or lambda expressions!
3450 }
3451 }.scan(tree.body);
3452 }
3453
3454 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3455
3456 @Override
3457 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3458 return t.isIntersection() ?
3459 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3460 }
3461
3462 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3463 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3464 return ict;
3465 }
3466
3467 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3468 ListBuffer<Type> targs = new ListBuffer<>();
3469 ListBuffer<Type> supertypes = new ListBuffer<>();
3470 for (Type i : ict.interfaces_field) {
3471 if (i.isParameterized()) {
3472 targs.appendList(i.tsym.type.allparams());
3473 }
3474 supertypes.append(i.tsym.type);
3475 }
3476 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3477 notionalIntf.allparams_field = targs.toList();
3478 notionalIntf.tsym.flags_field |= INTERFACE;
3479 return notionalIntf.tsym;
3480 }
3481 };
3482
3483 private Type fallbackDescriptorType(JCExpression tree) {
3484 switch (tree.getTag()) {
3485 case LAMBDA:
3486 JCLambda lambda = (JCLambda)tree;
3487 List<Type> argtypes = List.nil();
3488 for (JCVariableDecl param : lambda.params) {
3489 argtypes = !param.isImplicitlyTyped() && param.vartype.type != null ?
3490 argtypes.append(param.vartype.type) :
3491 argtypes.append(syms.errType);
3492 }
3493 return new MethodType(argtypes, Type.recoveryType,
3494 List.of(syms.throwableType), syms.methodClass);
3495 case REFERENCE:
3496 return new MethodType(List.nil(), Type.recoveryType,
3497 List.of(syms.throwableType), syms.methodClass);
3498 default:
3499 Assert.error("Cannot get here!");
3500 }
3501 return null;
3502 }
3503
3504 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3505 final InferenceContext inferenceContext, final Type... ts) {
3506 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3507 }
3508
3509 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3510 final InferenceContext inferenceContext, final List<Type> ts) {
3511 if (inferenceContext.free(ts)) {
3512 inferenceContext.addFreeTypeListener(ts,
3513 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3514 } else {
3515 for (Type t : ts) {
3516 rs.checkAccessibleType(env, t);
3517 }
3518 }
3519 }
3520
3521 /**
3522 * Lambda/method reference have a special check context that ensures
3523 * that i.e. a lambda return type is compatible with the expected
3524 * type according to both the inherited context and the assignment
3525 * context.
3526 */
3527 class FunctionalReturnContext extends Check.NestedCheckContext {
3528
3529 FunctionalReturnContext(CheckContext enclosingContext) {
3530 super(enclosingContext);
3531 }
3532
3533 @Override
3534 public boolean compatible(Type found, Type req, Warner warn) {
3535 //return type must be compatible in both current context and assignment context
3536 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3537 }
3538
3539 @Override
3540 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3541 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3542 }
3543 }
3544
3545 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3546
3547 JCExpression expr;
3548 boolean expStmtExpected;
3549
3550 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3551 super(enclosingContext);
3552 this.expr = expr;
3553 }
3554
3555 @Override
3556 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3557 if (expStmtExpected) {
3558 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3559 } else {
3560 super.report(pos, details);
3561 }
3562 }
3563
3564 @Override
3565 public boolean compatible(Type found, Type req, Warner warn) {
3566 //a void return is compatible with an expression statement lambda
3567 if (req.hasTag(VOID)) {
3568 expStmtExpected = true;
3569 return TreeInfo.isExpressionStatement(expr);
3570 } else {
3571 return super.compatible(found, req, warn);
3572 }
3573 }
3574 }
3575
3576 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3577 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3578 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3579 new FunctionalReturnContext(resultInfo.checkContext);
3580
3581 return descriptor.getReturnType() == Type.recoveryType ?
3582 recoveryInfo :
3583 new ResultInfo(KindSelector.VAL,
3584 descriptor.getReturnType(), funcContext);
3585 }
3586
3587 /**
3588 * Lambda compatibility. Check that given return types, thrown types, parameter types
3589 * are compatible with the expected functional interface descriptor. This means that:
3590 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3591 * types must be compatible with the return type of the expected descriptor.
3592 */
3593 void checkLambdaCompatible(JCLambda tree, Type descriptor, TypeSymbol target, CheckContext checkContext) {
3594 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3595
3596 //return values have already been checked - but if lambda has no return
3597 //values, we must ensure that void/value compatibility is correct;
3598 //this amounts at checking that, if a lambda body can complete normally,
3599 //the descriptor's return type must be void
3600 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3601 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3602 Fragment msg =
3603 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3604 checkContext.report(tree,
3605 diags.fragment(msg));
3606 }
3607
3608 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3609 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3610 checkContext.report(tree, diags.fragment(argTypes.size() != tree.params.size()
3611 ? Fragments.WrongNumberArgsInLambda(target)
3612 : Fragments.IncompatibleArgTypesInLambda(argTypes, TreeInfo.types(tree.params))));
3613 }
3614 }
3615
3616 /* This method returns an environment to be used to attribute a lambda
3617 * expression.
3618 *
3619 * The owner of this environment is a method symbol. If the current owner
3620 * is not a method (e.g. if the lambda occurs in a field initializer), then
3621 * a synthetic method symbol owner is created.
3622 */
3623 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3624 Env<AttrContext> lambdaEnv;
3625 Symbol owner = env.info.scope.owner;
3626 if (owner.kind == VAR && owner.owner.kind == TYP) {
3627 // If the lambda is nested in a field initializer, we need to create a fake init method.
3628 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3629 // init symbol's owner).
3630 ClassSymbol enclClass = owner.enclClass();
3631 Name initName = owner.isStatic() ? names.clinit : names.init;
3632 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3633 initName, initBlockType, enclClass);
3634 initSym.params = List.nil();
3635 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3636 } else {
3637 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3638 }
3639 lambdaEnv.info.yieldResult = null;
3640 lambdaEnv.info.isLambda = true;
3641 lambdaEnv.info.earlyContext = lambdaEnv.info.earlyContext.nested(false);
3642 return lambdaEnv;
3643 }
3644
3645 @Override
3646 public void visitReference(final JCMemberReference that) {
3647 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3648 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3649 //method reference only allowed in assignment or method invocation/cast context
3650 log.error(that.pos(), Errors.UnexpectedMref);
3651 }
3652 result = that.type = types.createErrorType(pt());
3653 return;
3654 }
3655 final Env<AttrContext> localEnv = env.dup(that);
3656 try {
3657 //attribute member reference qualifier - if this is a constructor
3658 //reference, the expected kind must be a type
3659 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3660
3661 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3662 exprType = chk.checkConstructorRefType(that.expr, exprType);
3663 if (!exprType.isErroneous() &&
3664 exprType.isRaw() &&
3665 that.typeargs != null) {
3666 log.error(that.expr.pos(),
3667 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3668 Fragments.MrefInferAndExplicitParams));
3669 exprType = types.createErrorType(exprType);
3670 }
3671 }
3672
3673 if (exprType.isErroneous()) {
3674 //if the qualifier expression contains problems,
3675 //give up attribution of method reference
3676 result = that.type = exprType;
3677 return;
3678 }
3679
3680 if (TreeInfo.isStaticSelector(that.expr, names)) {
3681 //if the qualifier is a type, validate it; raw warning check is
3682 //omitted as we don't know at this stage as to whether this is a
3683 //raw selector (because of inference)
3684 chk.validate(that.expr, env, false);
3685 } else {
3686 Symbol lhsSym = TreeInfo.symbol(that.expr);
3687 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3688 }
3689 //attrib type-arguments
3690 List<Type> typeargtypes = List.nil();
3691 if (that.typeargs != null) {
3692 typeargtypes = attribTypes(that.typeargs, localEnv);
3693 }
3694
3695 boolean isTargetSerializable =
3696 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3697 rs.isSerializable(pt());
3698 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3699 Type currentTarget = targetInfo.target;
3700 Type desc = targetInfo.descriptor;
3701
3702 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3703 List<Type> argtypes = desc.getParameterTypes();
3704 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3705
3706 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3707 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3708 }
3709
3710 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3711 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3712 try {
3713 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3714 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3715 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3716 } finally {
3717 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3718 }
3719
3720 Symbol refSym = refResult.fst;
3721 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3722
3723 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3724 * JDK-8075541
3725 */
3726 if (refSym.kind != MTH) {
3727 boolean targetError;
3728 switch (refSym.kind) {
3729 case ABSENT_MTH:
3730 targetError = false;
3731 break;
3732 case WRONG_MTH:
3733 case WRONG_MTHS:
3734 case AMBIGUOUS:
3735 case HIDDEN:
3736 case STATICERR:
3737 targetError = true;
3738 break;
3739 default:
3740 Assert.error("unexpected result kind " + refSym.kind);
3741 targetError = false;
3742 }
3743
3744 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3745 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3746 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3747
3748 JCDiagnostic diag = diags.create(log.currentSource(), that,
3749 targetError ?
3750 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3751 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3752
3753 if (targetError && currentTarget == Type.recoveryType) {
3754 //a target error doesn't make sense during recovery stage
3755 //as we don't know what actual parameter types are
3756 result = that.type = currentTarget;
3757 return;
3758 } else {
3759 if (targetError) {
3760 resultInfo.checkContext.report(that, diag);
3761 } else {
3762 log.report(diag);
3763 }
3764 result = that.type = types.createErrorType(currentTarget);
3765 return;
3766 }
3767 }
3768
3769 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3770 that.kind = lookupHelper.referenceKind(that.sym);
3771 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3772
3773 if (desc.getReturnType() == Type.recoveryType) {
3774 // stop here
3775 result = that.type = currentTarget;
3776 return;
3777 }
3778
3779 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3780 checkNewInnerClass(that.pos(), env, exprType, false);
3781 }
3782
3783 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3784
3785 if (that.getMode() == ReferenceMode.INVOKE &&
3786 TreeInfo.isStaticSelector(that.expr, names) &&
3787 that.kind.isUnbound() &&
3788 lookupHelper.site.isRaw()) {
3789 chk.checkRaw(that.expr, localEnv);
3790 }
3791
3792 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3793 exprType.getTypeArguments().nonEmpty()) {
3794 //static ref with class type-args
3795 log.error(that.expr.pos(),
3796 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3797 Fragments.StaticMrefWithTargs));
3798 result = that.type = types.createErrorType(currentTarget);
3799 return;
3800 }
3801
3802 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3803 // Check that super-qualified symbols are not abstract (JLS)
3804 rs.checkNonAbstract(that.pos(), that.sym);
3805 }
3806
3807 if (isTargetSerializable) {
3808 chk.checkAccessFromSerializableElement(that, true);
3809 }
3810 }
3811
3812 ResultInfo checkInfo =
3813 resultInfo.dup(newMethodTemplate(
3814 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3815 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3816 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3817
3818 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3819
3820 if (that.kind.isUnbound() &&
3821 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3822 //re-generate inference constraints for unbound receiver
3823 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3824 //cannot happen as this has already been checked - we just need
3825 //to regenerate the inference constraints, as that has been lost
3826 //as a result of the call to inferenceContext.save()
3827 Assert.error("Can't get here");
3828 }
3829 }
3830
3831 if (!refType.isErroneous()) {
3832 refType = types.createMethodTypeWithReturn(refType,
3833 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3834 }
3835
3836 //go ahead with standard method reference compatibility check - note that param check
3837 //is a no-op (as this has been taken care during method applicability)
3838 boolean isSpeculativeRound =
3839 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3840
3841 that.type = currentTarget; //avoids recovery at this stage
3842 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3843 if (!isSpeculativeRound) {
3844 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3845 }
3846 chk.checkRequiresIdentity(that, localEnv.info.lint);
3847 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3848 } catch (Types.FunctionDescriptorLookupError ex) {
3849 JCDiagnostic cause = ex.getDiagnostic();
3850 resultInfo.checkContext.report(that, cause);
3851 result = that.type = types.createErrorType(pt());
3852 return;
3853 }
3854 }
3855 //where
3856 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3857 //if this is a constructor reference, the expected kind must be a type
3858 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3859 KindSelector.VAL_TYP : KindSelector.TYP,
3860 Type.noType);
3861 }
3862
3863
3864 @SuppressWarnings("fallthrough")
3865 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3866 InferenceContext inferenceContext = checkContext.inferenceContext();
3867 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3868
3869 Type resType;
3870 switch (tree.getMode()) {
3871 case NEW:
3872 if (!tree.expr.type.isRaw()) {
3873 resType = tree.expr.type;
3874 break;
3875 }
3876 default:
3877 resType = refType.getReturnType();
3878 }
3879
3880 Type incompatibleReturnType = resType;
3881
3882 if (returnType.hasTag(VOID)) {
3883 incompatibleReturnType = null;
3884 }
3885
3886 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3887 Type capturedResType = captureMRefReturnType ? types.capture(resType) : resType;
3888 if (resType.isErroneous() ||
3889 new FunctionalReturnContext(checkContext).compatible(capturedResType, returnType,
3890 checkContext.checkWarner(tree, capturedResType, returnType))) {
3891 incompatibleReturnType = null;
3892 }
3893 }
3894
3895 if (incompatibleReturnType != null) {
3896 Fragment msg =
3897 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3898 checkContext.report(tree, diags.fragment(msg));
3899 } else {
3900 if (inferenceContext.free(refType)) {
3901 // we need to wait for inference to finish and then replace inference vars in the referent type
3902 inferenceContext.addFreeTypeListener(List.of(refType),
3903 instantiatedContext -> {
3904 tree.referentType = instantiatedContext.asInstType(refType);
3905 });
3906 } else {
3907 tree.referentType = refType;
3908 }
3909 }
3910
3911 if (!speculativeAttr) {
3912 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3913 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3914 }
3915 }
3916 }
3917
3918 boolean checkExConstraints(
3919 List<Type> thrownByFuncExpr,
3920 List<Type> thrownAtFuncType,
3921 InferenceContext inferenceContext) {
3922 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3923 * are not proper types
3924 */
3925 List<Type> nonProperList = thrownAtFuncType.stream()
3926 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3927 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3928
3929 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3930 * in the throws clause of the invocation type of the method reference's compile-time
3931 * declaration
3932 */
3933 List<Type> checkedList = thrownByFuncExpr.stream()
3934 .filter(e -> chk.isChecked(e)).collect(List.collector());
3935
3936 /** If n = 0 (the function type's throws clause consists only of proper types), then
3937 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3938 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3939 * reduces to true
3940 */
3941 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3942 for (Type checked : checkedList) {
3943 boolean isSubtype = false;
3944 for (Type proper : properList) {
3945 if (types.isSubtype(checked, proper)) {
3946 isSubtype = true;
3947 break;
3948 }
3949 }
3950 if (!isSubtype) {
3951 uncaughtByProperTypes.add(checked);
3952 }
3953 }
3954
3955 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3956 return false;
3957 }
3958
3959 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3960 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3961 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3962 */
3963 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3964 uncaughtByProperTypes.forEach(checkedEx -> {
3965 nonProperAsUndet.forEach(nonProper -> {
3966 types.isSubtype(checkedEx, nonProper);
3967 });
3968 });
3969
3970 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3971 */
3972 nonProperAsUndet.stream()
3973 .filter(t -> t.hasTag(UNDETVAR))
3974 .forEach(t -> ((UndetVar)t).setThrow());
3975 return true;
3976 }
3977
3978 /**
3979 * Set functional type info on the underlying AST. Note: as the target descriptor
3980 * might contain inference variables, we might need to register an hook in the
3981 * current inference context.
3982 */
3983 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3984 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3985 if (checkContext.inferenceContext().free(descriptorType)) {
3986 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3987 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3988 inferenceContext.asInstType(primaryTarget), checkContext));
3989 } else {
3990 fExpr.owner = env.info.scope.owner;
3991 if (pt.hasTag(CLASS)) {
3992 fExpr.target = primaryTarget;
3993 }
3994 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3995 pt != Type.recoveryType) {
3996 //check that functional interface class is well-formed
3997 try {
3998 /* Types.makeFunctionalInterfaceClass() may throw an exception
3999 * when it's executed post-inference. See the listener code
4000 * above.
4001 */
4002 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4003 names.empty, fExpr.target, ABSTRACT);
4004 if (csym != null) {
4005 chk.checkImplementations(env.tree, csym, csym);
4006 try {
4007 //perform an additional functional interface check on the synthetic class,
4008 //as there may be spurious errors for raw targets - because of existing issues
4009 //with membership and inheritance (see JDK-8074570).
4010 csym.flags_field |= INTERFACE;
4011 types.findDescriptorType(csym.type);
4012 } catch (FunctionDescriptorLookupError err) {
4013 resultInfo.checkContext.report(fExpr,
4014 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4015 }
4016 }
4017 } catch (Types.FunctionDescriptorLookupError ex) {
4018 JCDiagnostic cause = ex.getDiagnostic();
4019 resultInfo.checkContext.report(env.tree, cause);
4020 }
4021 }
4022 }
4023 }
4024
4025 public void visitParens(JCParens tree) {
4026 Type owntype = attribTree(tree.expr, env, resultInfo);
4027 result = check(tree, owntype, pkind(), resultInfo);
4028 Symbol sym = TreeInfo.symbol(tree);
4029 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4030 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4031 }
4032
4033 public void visitAssign(JCAssign tree) {
4034 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4035 Type capturedType = capture(owntype);
4036 attribExpr(tree.rhs, env, owntype);
4037 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4038 }
4039
4040 public void visitAssignop(JCAssignOp tree) {
4041 // Attribute arguments.
4042 Type owntype = attribTree(tree.lhs, env, varAssignmentOpInfo);
4043 Type operand = attribExpr(tree.rhs, env);
4044 // Find operator.
4045 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4046 if (operator != operators.noOpSymbol &&
4047 !owntype.isErroneous() &&
4048 !operand.isErroneous()) {
4049 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4050 chk.checkCastable(tree.rhs.pos(),
4051 operator.type.getReturnType(),
4052 owntype);
4053 switch (tree.getTag()) {
4054 case SL_ASG, SR_ASG, USR_ASG -> { } // we only use (at most) the lower 6 bits, so any integral type is OK
4055 default -> chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4056 }
4057 chk.checkOutOfRangeShift(tree.rhs.pos(), operator, operand);
4058 }
4059 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4060 }
4061
4062 public void visitUnary(JCUnary tree) {
4063 // Attribute arguments.
4064 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4065 ? attribTree(tree.arg, env, varAssignmentOpInfo)
4066 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4067
4068 // Find operator.
4069 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4070 Type owntype = types.createErrorType(tree.type);
4071 if (operator != operators.noOpSymbol &&
4072 !argtype.isErroneous()) {
4073 owntype = (tree.getTag().isIncOrDecUnaryOp())
4074 ? tree.arg.type
4075 : operator.type.getReturnType();
4076 int opc = operator.opcode;
4077
4078 // If the argument is constant, fold it.
4079 if (argtype.constValue() != null) {
4080 Type ctype = cfolder.fold1(opc, argtype);
4081 if (ctype != null) {
4082 owntype = cfolder.coerce(ctype, owntype);
4083 }
4084 }
4085 }
4086 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4087 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4088 }
4089
4090 public void visitBinary(JCBinary tree) {
4091 // Attribute arguments.
4092 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4093 // x && y
4094 // include x's bindings when true in y
4095
4096 // x || y
4097 // include x's bindings when false in y
4098
4099 MatchBindings lhsBindings = matchBindings;
4100 List<BindingSymbol> propagatedBindings;
4101 switch (tree.getTag()) {
4102 case AND:
4103 propagatedBindings = lhsBindings.bindingsWhenTrue;
4104 break;
4105 case OR:
4106 propagatedBindings = lhsBindings.bindingsWhenFalse;
4107 break;
4108 default:
4109 propagatedBindings = List.nil();
4110 break;
4111 }
4112 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4113 Type right;
4114 try {
4115 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4116 } finally {
4117 rhsEnv.info.scope.leave();
4118 }
4119
4120 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4121
4122 // Find operator.
4123 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4124 Type owntype = types.createErrorType(tree.type);
4125 if (operator != operators.noOpSymbol &&
4126 !left.isErroneous() &&
4127 !right.isErroneous()) {
4128 owntype = operator.type.getReturnType();
4129 int opc = operator.opcode;
4130 // If both arguments are constants, fold them.
4131 if (left.constValue() != null && right.constValue() != null) {
4132 Type ctype = cfolder.fold2(opc, left, right);
4133 if (ctype != null) {
4134 owntype = cfolder.coerce(ctype, owntype);
4135 }
4136 }
4137
4138 // Check that argument types of a reference ==, != are
4139 // castable to each other, (JLS 15.21). Note: unboxing
4140 // comparisons will not have an acmp* opc at this point.
4141 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4142 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4143 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4144 }
4145 }
4146
4147 chk.checkDivZero(tree.rhs.pos(), operator, right);
4148 chk.checkOutOfRangeShift(tree.rhs.pos(), operator, right);
4149 }
4150 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4151 }
4152
4153 public void visitTypeCast(final JCTypeCast tree) {
4154 Type clazztype = attribType(tree.clazz, env);
4155 chk.validate(tree.clazz, env, false);
4156 chk.checkRequiresIdentity(tree, env.info.lint);
4157 //a fresh environment is required for 292 inference to work properly ---
4158 //see Infer.instantiatePolymorphicSignatureInstance()
4159 Env<AttrContext> localEnv = env.dup(tree);
4160 //should we propagate the target type?
4161 final ResultInfo castInfo;
4162 JCExpression expr = TreeInfo.skipParens(tree.expr);
4163 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4164 if (isPoly) {
4165 //expression is a poly - we need to propagate target type info
4166 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4167 new Check.NestedCheckContext(resultInfo.checkContext) {
4168 @Override
4169 public boolean compatible(Type found, Type req, Warner warn) {
4170 return types.isCastable(found, req, warn);
4171 }
4172 });
4173 } else {
4174 //standalone cast - target-type info is not propagated
4175 castInfo = unknownExprInfo;
4176 }
4177 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4178 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4179 if (exprtype.constValue() != null)
4180 owntype = cfolder.coerce(exprtype, owntype);
4181 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4182 if (!isPoly)
4183 chk.checkRedundantCast(localEnv, tree);
4184 }
4185
4186 public void visitTypeTest(JCInstanceOf tree) {
4187 Type exprtype = attribExpr(tree.expr, env);
4188 if (exprtype.isPrimitive()) {
4189 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4190 } else {
4191 exprtype = chk.checkNullOrRefType(
4192 tree.expr.pos(), exprtype);
4193 }
4194 Type clazztype;
4195 JCTree typeTree;
4196 if (tree.pattern.getTag() == BINDINGPATTERN ||
4197 tree.pattern.getTag() == RECORDPATTERN) {
4198 attribExpr(tree.pattern, env, exprtype);
4199 clazztype = tree.pattern.type;
4200 if (types.isSubtype(exprtype, clazztype) &&
4201 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4202 tree.pattern.getTag() != RECORDPATTERN) {
4203 if (!allowUnconditionalPatternsInstanceOf) {
4204 log.error(tree.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4205 }
4206 }
4207 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4208 } else {
4209 clazztype = attribType(tree.pattern, env);
4210 typeTree = tree.pattern;
4211 chk.validate(typeTree, env, false);
4212 }
4213 if (clazztype.isPrimitive()) {
4214 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4215 } else {
4216 if (!clazztype.hasTag(TYPEVAR)) {
4217 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4218 }
4219 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4220 boolean valid = false;
4221 if (allowReifiableTypesInInstanceof) {
4222 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4223 } else {
4224 log.error(tree.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4225 allowReifiableTypesInInstanceof = true;
4226 }
4227 if (!valid) {
4228 clazztype = types.createErrorType(clazztype);
4229 }
4230 }
4231 }
4232 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4233 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4234 }
4235
4236 private boolean checkCastablePattern(DiagnosticPosition pos,
4237 Type exprType,
4238 Type pattType) {
4239 Warner warner = new Warner();
4240 // if any type is erroneous, the problem is reported elsewhere
4241 if (exprType.isErroneous() || pattType.isErroneous()) {
4242 return false;
4243 }
4244 if (!types.isCastable(exprType, pattType, warner)) {
4245 chk.basicHandler.report(pos,
4246 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4247 return false;
4248 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4249 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4250 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4251 return true;
4252 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4253 log.error(pos,
4254 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4255 return false;
4256 } else {
4257 return true;
4258 }
4259 }
4260
4261 @Override
4262 public void visitAnyPattern(JCAnyPattern tree) {
4263 result = tree.type = resultInfo.pt;
4264 }
4265
4266 public void visitBindingPattern(JCBindingPattern tree) {
4267 Type type;
4268 if (!tree.var.isImplicitlyTyped()) {
4269 type = attribType(tree.var.vartype, env);
4270 } else {
4271 type = resultInfo.pt;
4272 }
4273 BindingSymbol v = new BindingSymbol(tree.var.mods.flags | tree.var.declKind.additionalSymbolFlags,
4274 tree.var.name, type, env.info.scope.owner);
4275 v.pos = tree.pos;
4276 tree.var.sym = v;
4277 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4278 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4279 }
4280 if (tree.var.isImplicitlyTyped()) {
4281 setupImplicitlyTypedVariable(tree.var, type == Type.noType ? syms.errType
4282 : type);
4283 }
4284 chk.validate(tree.var.vartype, env, true);
4285 annotate.annotateLater(tree.var.mods.annotations, env, v);
4286 if (!tree.var.isImplicitlyTyped()) {
4287 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v);
4288 }
4289 annotate.flush();
4290 typeAnnotations.organizeTypeAnnotationsSignaturesForLocalVarType(env, tree.var);
4291 result = tree.type = tree.var.type = v.type;
4292 if (v.isUnnamedVariable()) {
4293 matchBindings = MatchBindingsComputer.EMPTY;
4294 } else {
4295 matchBindings = new MatchBindings(List.of(v), List.nil());
4296 }
4297 chk.checkRequiresIdentity(tree, env.info.lint);
4298 }
4299
4300 @Override
4301 public void visitRecordPattern(JCRecordPattern tree) {
4302 Type site;
4303
4304 if (tree.deconstructor.hasTag(VARTYPE)) {
4305 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4306 tree.record = syms.errSymbol;
4307 site = tree.type = types.createErrorType(tree.record.type);
4308 } else {
4309 Type type = attribType(tree.deconstructor, env);
4310 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4311 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4312 if (inferred == null) {
4313 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4314 } else {
4315 type = inferred;
4316 }
4317 }
4318 tree.type = tree.deconstructor.type = type;
4319 site = types.capture(tree.type);
4320 chk.validate(tree.deconstructor, env, true);
4321 }
4322
4323 List<Type> expectedRecordTypes;
4324 if (site.tsym instanceof ClassSymbol clazz && clazz.isRecord()) {
4325 ClassSymbol record = (ClassSymbol) site.tsym;
4326 expectedRecordTypes = record.getRecordComponents()
4327 .stream()
4328 .map(rc -> types.memberType(site, rc))
4329 .map(t -> types.upward(t, types.captures(t)).baseType())
4330 .collect(List.collector());
4331 tree.record = record;
4332 } else {
4333 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4334 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4335 .limit(tree.nested.size())
4336 .collect(List.collector());
4337 tree.record = syms.errSymbol;
4338 }
4339 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4340 List<Type> recordTypes = expectedRecordTypes;
4341 List<JCPattern> nestedPatterns = tree.nested;
4342 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4343 try {
4344 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4345 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4346 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4347 outBindings.addAll(matchBindings.bindingsWhenTrue);
4348 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4349 nestedPatterns = nestedPatterns.tail;
4350 recordTypes = recordTypes.tail;
4351 }
4352 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4353 while (nestedPatterns.nonEmpty()) {
4354 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4355 nestedPatterns = nestedPatterns.tail;
4356 }
4357 List<Type> nestedTypes =
4358 tree.nested.stream().map(p -> p.type).collect(List.collector());
4359 log.error(tree.pos(),
4360 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4361 nestedTypes));
4362 }
4363 } finally {
4364 localEnv.info.scope.leave();
4365 }
4366 result = tree.type;
4367 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4368 }
4369
4370 public void visitIndexed(JCArrayAccess tree) {
4371 Type owntype = types.createErrorType(tree.type);
4372 Type atype = attribExpr(tree.indexed, env);
4373 attribExpr(tree.index, env, syms.intType);
4374 if (types.isArray(atype))
4375 owntype = types.elemtype(atype);
4376 else if (!atype.hasTag(ERROR))
4377 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4378 if (!pkind().contains(KindSelector.VAL))
4379 owntype = capture(owntype);
4380 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4381 }
4382
4383 public void visitIdent(JCIdent tree) {
4384 Symbol sym;
4385
4386 // Find symbol
4387 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4388 // If we are looking for a method, the prototype `pt' will be a
4389 // method type with the type of the call's arguments as parameters.
4390 env.info.pendingResolutionPhase = null;
4391 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4392 } else if (tree.sym != null && tree.sym.kind != VAR) {
4393 sym = tree.sym;
4394 } else {
4395 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4396 }
4397 tree.sym = sym;
4398
4399 // Also find the environment current for the class where
4400 // sym is defined (`symEnv').
4401 Env<AttrContext> symEnv = env;
4402 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4403 sym.kind.matches(KindSelector.VAL_MTH) &&
4404 sym.owner.kind == TYP &&
4405 tree.name != names._this && tree.name != names._super) {
4406
4407 // Find environment in which identifier is defined.
4408 while (symEnv.outer != null &&
4409 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4410 symEnv = symEnv.outer;
4411 }
4412 }
4413
4414 // If symbol is a variable, ...
4415 if (sym.kind == VAR) {
4416 VarSymbol v = (VarSymbol)sym;
4417
4418 // ..., evaluate its initializer, if it has one, and check for
4419 // illegal forward reference.
4420 checkInit(tree, env, v, false);
4421
4422 // If we are expecting a variable (as opposed to a value), check
4423 // that the variable is assignable in the current environment.
4424 if (KindSelector.ASG.subset(pkind()))
4425 checkAssignable(tree.pos(), v, null, env);
4426 }
4427
4428 Env<AttrContext> env1 = env;
4429 if (sym.kind != ERR && sym.kind != TYP &&
4430 sym.owner != null && sym.owner != env1.enclClass.sym) {
4431 // If the found symbol is inaccessible, then it is
4432 // accessed through an enclosing instance. Locate this
4433 // enclosing instance:
4434 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4435 env1 = env1.outer;
4436 }
4437
4438 if (env.info.isSerializable) {
4439 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4440 }
4441
4442 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4443 }
4444
4445 public void visitSelect(JCFieldAccess tree) {
4446 // Determine the expected kind of the qualifier expression.
4447 KindSelector skind = KindSelector.NIL;
4448 if (tree.name == names._this || tree.name == names._super ||
4449 tree.name == names._class)
4450 {
4451 skind = KindSelector.TYP;
4452 } else {
4453 if (pkind().contains(KindSelector.PCK))
4454 skind = KindSelector.of(skind, KindSelector.PCK);
4455 if (pkind().contains(KindSelector.TYP))
4456 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4457 if (pkind().contains(KindSelector.VAL_MTH))
4458 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4459 }
4460
4461 // Attribute the qualifier expression, and determine its symbol (if any).
4462 Type site;
4463 EarlyConstructionContext earlyConstructionPrev = env.info.earlyContext;
4464 JCTree earlyFieldQualifier = earlyFieldQualifier(tree);
4465 try {
4466 if (earlyFieldQualifier != null) {
4467 // if we're seeing a likely field access, and qualifier is this/super,
4468 // pretend we're not in early construction context. This allows Resolve
4469 // to skip premature checks against this/super
4470 env.info.earlyContext = EarlyConstructionContext.NONE;
4471 }
4472 site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4473 } finally {
4474 env.info.earlyContext = earlyConstructionPrev;
4475 }
4476 Assert.check(site == tree.selected.type);
4477 if (!pkind().contains(KindSelector.TYP_PCK))
4478 site = capture(site); // Capture field access
4479
4480 // don't allow T.class T[].class, etc
4481 if (skind == KindSelector.TYP) {
4482 Type elt = site;
4483 while (elt.hasTag(ARRAY))
4484 elt = ((ArrayType)elt).elemtype;
4485 if (elt.hasTag(TYPEVAR)) {
4486 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4487 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4488 tree.sym = tree.type.tsym;
4489 return ;
4490 }
4491 }
4492
4493 // If qualifier symbol is a type or `super', assert `selectSuper'
4494 // for the selection. This is relevant for determining whether
4495 // protected symbols are accessible.
4496 Symbol sitesym = TreeInfo.symbol(tree.selected);
4497 boolean selectSuperPrev = env.info.selectSuper;
4498 env.info.selectSuper =
4499 sitesym != null &&
4500 sitesym.name == names._super;
4501
4502 // Determine the symbol represented by the selection.
4503 env.info.pendingResolutionPhase = null;
4504 Symbol sym;
4505 sym = selectSym(tree, sitesym, site, env, resultInfo, earlyFieldQualifier);
4506 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4507 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4508 sym = syms.errSymbol;
4509 }
4510 if (sym.exists() && !isType(sym) &&
4511 tree.name != names._this && tree.name != names._super &&
4512 pkind().contains(KindSelector.TYP_PCK)) {
4513 site = capture(site);
4514 sym = selectSym(tree, sitesym, site, env, resultInfo, earlyFieldQualifier);
4515 }
4516 boolean varArgs = env.info.lastResolveVarargs();
4517 tree.sym = sym;
4518
4519 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4520 site = types.skipTypeVars(site, true);
4521 }
4522
4523 // If that symbol is a variable, ...
4524 if (sym.kind == VAR) {
4525 VarSymbol v = (VarSymbol)sym;
4526
4527 // ..., evaluate its initializer, if it has one, and check for
4528 // illegal forward reference.
4529 checkInit(tree, env, v, true);
4530
4531 // If we are expecting a variable (as opposed to a value), check
4532 // that the variable is assignable in the current environment.
4533 if (KindSelector.ASG.subset(pkind()))
4534 checkAssignable(tree.pos(), v, tree.selected, env);
4535 }
4536
4537 if (sitesym != null &&
4538 sitesym.kind == VAR &&
4539 ((VarSymbol)sitesym).isResourceVariable() &&
4540 sym.kind == MTH &&
4541 sym.name.equals(names.close) &&
4542 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4543 log.warning(tree, LintWarnings.TryExplicitCloseCall);
4544 }
4545
4546 // Disallow selecting a type from an expression
4547 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4548 tree.type = check(tree.selected, pt(),
4549 sitesym == null ?
4550 KindSelector.VAL : sitesym.kind.toSelector(),
4551 new ResultInfo(KindSelector.TYP_PCK, pt()));
4552 }
4553
4554 if (isType(sitesym)) {
4555 if (sym.name != names._this && sym.name != names._super) {
4556 // Check if type-qualified fields or methods are static (JLS)
4557 if ((sym.flags() & STATIC) == 0 &&
4558 sym.name != names._super &&
4559 (sym.kind == VAR || sym.kind == MTH)) {
4560 rs.accessBase(rs.new StaticError(sym),
4561 tree.pos(), site, sym.name, true);
4562 }
4563 }
4564 } else if (sym.kind != ERR &&
4565 (sym.flags() & STATIC) != 0 &&
4566 sym.name != names._class) {
4567 // If the qualified item is not a type and the selected item is static, report
4568 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4569 if (!sym.owner.isAnonymous()) {
4570 log.warning(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4571 } else {
4572 log.warning(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4573 }
4574 }
4575
4576 // If we are selecting an instance member via a `super', ...
4577 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4578
4579 // Check that super-qualified symbols are not abstract (JLS)
4580 rs.checkNonAbstract(tree.pos(), sym);
4581
4582 if (site.isRaw()) {
4583 // Determine argument types for site.
4584 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4585 if (site1 != null) site = site1;
4586 }
4587 }
4588
4589 if (env.info.isSerializable) {
4590 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4591 }
4592
4593 env.info.selectSuper = selectSuperPrev;
4594 result = checkId(tree, site, sym, env, resultInfo);
4595 }
4596
4597 private JCTree earlyFieldQualifier(JCFieldAccess tree) {
4598 boolean methodSelect = resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL);
4599 if (!methodSelect &&
4600 (TreeInfo.isThisOrSelectorDotThis(tree.selected) ||
4601 TreeInfo.isSuperOrSelectorDotSuper(tree.selected))) {
4602 return tree.selected;
4603 }
4604 return null;
4605 }
4606
4607 //where
4608 /** Determine symbol referenced by a Select expression,
4609 *
4610 * @param tree The select tree.
4611 * @param site The type of the selected expression,
4612 * @param env The current environment.
4613 * @param resultInfo The current result.
4614 */
4615 private Symbol selectSym(JCFieldAccess tree,
4616 Symbol location,
4617 Type site,
4618 Env<AttrContext> env,
4619 ResultInfo resultInfo,
4620 JCTree earlyFieldQualifier) {
4621 DiagnosticPosition pos = tree.pos();
4622 Name name = tree.name;
4623 switch (site.getTag()) {
4624 case PACKAGE:
4625 return rs.accessBase(
4626 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4627 pos, location, site, name, true);
4628 case ARRAY:
4629 case CLASS:
4630 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4631 return rs.resolveQualifiedMethod(
4632 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4633 } else if (name == names._this || name == names._super) {
4634 Symbol sym = rs.resolveSelf(pos, env, site.tsym, tree);
4635 return rs.accessBase(sym, pos, env.enclClass.sym.type, name, true);
4636 } else if (name == names._class) {
4637 // In this case, we have already made sure in
4638 // visitSelect that qualifier expression is a type.
4639 return syms.getClassField(site, types);
4640 } else {
4641 // We are seeing a plain identifier as selector.
4642 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind, earlyFieldQualifier);
4643 sym = rs.accessBase(sym, pos, location, site, name, true);
4644 return sym;
4645 }
4646 case WILDCARD:
4647 throw new AssertionError(tree);
4648 case TYPEVAR:
4649 // Normally, site.getUpperBound() shouldn't be null.
4650 // It should only happen during memberEnter/attribBase
4651 // when determining the supertype which *must* be
4652 // done before attributing the type variables. In
4653 // other words, we are seeing this illegal program:
4654 // class B<T> extends A<T.foo> {}
4655 Symbol sym = (site.getUpperBound() != null)
4656 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo, earlyFieldQualifier)
4657 : null;
4658 if (sym == null) {
4659 log.error(pos, Errors.TypeVarCantBeDeref);
4660 return syms.errSymbol;
4661 } else {
4662 // JLS 4.9 specifies the members are derived by inheritance.
4663 // We skip inducing a whole class by filtering members that
4664 // can never be inherited:
4665 Symbol sym2;
4666 if (sym.isPrivate()) {
4667 // Private members
4668 sym2 = rs.new AccessError(env, site, sym);
4669 } else if (sym.owner.isInterface() && sym.kind == MTH && (sym.flags() & STATIC) != 0) {
4670 // Interface static methods
4671 sym2 = rs.new SymbolNotFoundError(ABSENT_MTH);
4672 } else {
4673 sym2 = sym;
4674 }
4675 rs.accessBase(sym2, pos, location, site, name, true);
4676 return sym;
4677 }
4678 case ERROR:
4679 // preserve identifier names through errors
4680 return types.createErrorType(name, site.tsym, site).tsym;
4681 default:
4682 // The qualifier expression is of a primitive type -- only
4683 // .class is allowed for these.
4684 if (name == names._class) {
4685 // In this case, we have already made sure in Select that
4686 // qualifier expression is a type.
4687 return syms.getClassField(site, types);
4688 } else {
4689 log.error(pos, Errors.CantDeref(site));
4690 return types.createErrorType(name, syms.errSymbol, site).tsym;
4691 }
4692 }
4693 }
4694
4695 /** Determine type of identifier or select expression and check that
4696 * (1) the referenced symbol is not deprecated
4697 * (2) the symbol's type is safe (@see checkSafe)
4698 * (3) if symbol is a variable, check that its type and kind are
4699 * compatible with the prototype and protokind.
4700 * (4) if symbol is an instance field of a raw type,
4701 * which is being assigned to, issue an unchecked warning if its
4702 * type changes under erasure.
4703 * (5) if symbol is an instance method of a raw type, issue an
4704 * unchecked warning if its argument types change under erasure.
4705 * If checks succeed:
4706 * If symbol is a constant, return its constant type
4707 * else if symbol is a method, return its result type
4708 * otherwise return its type.
4709 * Otherwise return errType.
4710 *
4711 * @param tree The syntax tree representing the identifier
4712 * @param site If this is a select, the type of the selected
4713 * expression, otherwise the type of the current class.
4714 * @param sym The symbol representing the identifier.
4715 * @param env The current environment.
4716 * @param resultInfo The expected result
4717 */
4718 Type checkId(JCTree tree,
4719 Type site,
4720 Symbol sym,
4721 Env<AttrContext> env,
4722 ResultInfo resultInfo) {
4723 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4724 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4725 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4726 }
4727
4728 Type checkMethodIdInternal(JCTree tree,
4729 Type site,
4730 Symbol sym,
4731 Env<AttrContext> env,
4732 ResultInfo resultInfo) {
4733 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4734 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4735 } else {
4736 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4737 }
4738 }
4739
4740 Type checkIdInternal(JCTree tree,
4741 Type site,
4742 Symbol sym,
4743 Type pt,
4744 Env<AttrContext> env,
4745 ResultInfo resultInfo) {
4746 Type owntype; // The computed type of this identifier occurrence.
4747 switch (sym.kind) {
4748 case TYP:
4749 // For types, the computed type equals the symbol's type,
4750 // except for two situations:
4751 owntype = sym.type;
4752 if (owntype.hasTag(CLASS)) {
4753 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4754 Type ownOuter = owntype.getEnclosingType();
4755
4756 // (a) If the symbol's type is parameterized, erase it
4757 // because no type parameters were given.
4758 // We recover generic outer type later in visitTypeApply.
4759 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4760 owntype = types.erasure(owntype);
4761 }
4762
4763 // (b) If the symbol's type is an inner class, then
4764 // we have to interpret its outer type as a superclass
4765 // of the site type. Example:
4766 //
4767 // class Tree<A> { class Visitor { ... } }
4768 // class PointTree extends Tree<Point> { ... }
4769 // ...PointTree.Visitor...
4770 //
4771 // Then the type of the last expression above is
4772 // Tree<Point>.Visitor.
4773 else if ((ownOuter.hasTag(CLASS) || ownOuter.hasTag(TYPEVAR)) && site != ownOuter) {
4774 Type normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4775 if (normOuter == null) // perhaps from an import
4776 normOuter = types.erasure(ownOuter);
4777 if (normOuter != ownOuter)
4778 owntype = new ClassType(
4779 normOuter, List.nil(), owntype.tsym,
4780 owntype.getMetadata());
4781 }
4782 }
4783 break;
4784 case VAR:
4785 VarSymbol v = (VarSymbol)sym;
4786
4787 if (env.info.enclVar != null
4788 && v.type.hasTag(NONE)) {
4789 //self reference to implicitly typed variable declaration
4790 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4791 return tree.type = v.type = types.createErrorType(v.type);
4792 }
4793
4794 // Test (4): if symbol is an instance field of a raw type,
4795 // which is being assigned to, issue an unchecked warning if
4796 // its type changes under erasure.
4797 if (KindSelector.ASG.subset(pkind()) &&
4798 v.owner.kind == TYP &&
4799 (v.flags() & STATIC) == 0 &&
4800 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4801 Type s = types.asOuterSuper(site, v.owner);
4802 if (s != null &&
4803 s.isRaw() &&
4804 !types.isSameType(v.type, v.erasure(types))) {
4805 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4806 }
4807 }
4808 // The computed type of a variable is the type of the
4809 // variable symbol, taken as a member of the site type.
4810 owntype = (sym.owner.kind == TYP &&
4811 sym.name != names._this && sym.name != names._super)
4812 ? types.memberType(site, sym)
4813 : sym.type;
4814
4815 // If the variable is a constant, record constant value in
4816 // computed type.
4817 if (v.getConstValue() != null && isStaticReference(tree))
4818 owntype = owntype.constType(v.getConstValue());
4819
4820 if (resultInfo.pkind == KindSelector.VAL) {
4821 owntype = capture(owntype); // capture "names as expressions"
4822 }
4823 break;
4824 case MTH: {
4825 owntype = checkMethod(site, sym,
4826 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4827 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4828 resultInfo.pt.getTypeArguments());
4829 chk.checkRestricted(tree.pos(), sym);
4830 break;
4831 }
4832 case PCK: case ERR:
4833 owntype = sym.type;
4834 break;
4835 default:
4836 throw new AssertionError("unexpected kind: " + sym.kind +
4837 " in tree " + tree);
4838 }
4839
4840 // Emit a `deprecation' warning if symbol is deprecated.
4841 // (for constructors (but not for constructor references), the error
4842 // was given when the constructor was resolved)
4843
4844 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4845 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4846 chk.checkSunAPI(tree.pos(), sym);
4847 chk.checkProfile(tree.pos(), sym);
4848 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4849 }
4850
4851 if (pt.isErroneous()) {
4852 owntype = types.createErrorType(owntype);
4853 }
4854
4855 // If symbol is a variable, check that its type and
4856 // kind are compatible with the prototype and protokind.
4857 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4858 }
4859
4860 /** Check that variable is initialized and evaluate the variable's
4861 * initializer, if not yet done. Also check that variable is not
4862 * referenced before it is defined.
4863 * @param tree The tree making up the variable reference.
4864 * @param env The current environment.
4865 * @param v The variable's symbol.
4866 */
4867 private void checkInit(JCTree tree,
4868 Env<AttrContext> env,
4869 VarSymbol v,
4870 boolean onlyWarning) {
4871 // A forward reference is diagnosed if the declaration position
4872 // of the variable is greater than the current tree position
4873 // and the tree and variable definition occur in the same class
4874 // definition. Note that writes don't count as references.
4875 // This check applies only to class and instance
4876 // variables. Local variables follow different scope rules,
4877 // and are subject to definite assignment checking.
4878 Env<AttrContext> initEnv = enclosingInitEnv(env);
4879 if (initEnv != null &&
4880 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4881 v.owner.kind == TYP &&
4882 v.owner == env.info.scope.owner.enclClass() &&
4883 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4884 (!env.tree.hasTag(ASSIGN) ||
4885 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4886 if (!onlyWarning || isStaticEnumField(v)) {
4887 Error errkey = (initEnv.info.enclVar == v) ?
4888 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4889 log.error(tree.pos(), errkey);
4890 } else if (useBeforeDeclarationWarning) {
4891 Warning warnkey = (initEnv.info.enclVar == v) ?
4892 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4893 log.warning(tree.pos(), warnkey);
4894 }
4895 }
4896
4897 v.getConstValue(); // ensure initializer is evaluated
4898
4899 checkEnumInitializer(tree, env, v);
4900 }
4901
4902 /**
4903 * Returns the enclosing init environment associated with this env (if any). An init env
4904 * can be either a field declaration env or a static/instance initializer env.
4905 */
4906 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4907 while (true) {
4908 switch (env.tree.getTag()) {
4909 case VARDEF:
4910 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4911 if (vdecl.sym.owner.kind == TYP) {
4912 //field
4913 return env;
4914 }
4915 break;
4916 case BLOCK:
4917 if (env.next.tree.hasTag(CLASSDEF)) {
4918 //instance/static initializer
4919 return env;
4920 }
4921 break;
4922 case METHODDEF:
4923 case CLASSDEF:
4924 case TOPLEVEL:
4925 return null;
4926 }
4927 Assert.checkNonNull(env.next);
4928 env = env.next;
4929 }
4930 }
4931
4932 /**
4933 * Check for illegal references to static members of enum. In
4934 * an enum type, constructors and initializers may not
4935 * reference its static members unless they are constant.
4936 *
4937 * @param tree The tree making up the variable reference.
4938 * @param env The current environment.
4939 * @param v The variable's symbol.
4940 * @jls 8.9 Enum Types
4941 */
4942 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4943 // JLS:
4944 //
4945 // "It is a compile-time error to reference a static field
4946 // of an enum type that is not a compile-time constant
4947 // (15.28) from constructors, instance initializer blocks,
4948 // or instance variable initializer expressions of that
4949 // type. It is a compile-time error for the constructors,
4950 // instance initializer blocks, or instance variable
4951 // initializer expressions of an enum constant e to refer
4952 // to itself or to an enum constant of the same type that
4953 // is declared to the right of e."
4954 if (isStaticEnumField(v)) {
4955 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4956
4957 if (enclClass == null || enclClass.owner == null)
4958 return;
4959
4960 // See if the enclosing class is the enum (or a
4961 // subclass thereof) declaring v. If not, this
4962 // reference is OK.
4963 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4964 return;
4965
4966 // If the reference isn't from an initializer, then
4967 // the reference is OK.
4968 if (!Resolve.isInitializer(env))
4969 return;
4970
4971 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4972 }
4973 }
4974
4975 /** Is the given symbol a static, non-constant field of an Enum?
4976 * Note: enum literals should not be regarded as such
4977 */
4978 private boolean isStaticEnumField(VarSymbol v) {
4979 return Flags.isEnum(v.owner) &&
4980 Flags.isStatic(v) &&
4981 !Flags.isConstant(v) &&
4982 v.name != names._class;
4983 }
4984
4985 /**
4986 * Check that method arguments conform to its instantiation.
4987 **/
4988 public Type checkMethod(Type site,
4989 final Symbol sym,
4990 ResultInfo resultInfo,
4991 Env<AttrContext> env,
4992 final List<JCExpression> argtrees,
4993 List<Type> argtypes,
4994 List<Type> typeargtypes) {
4995 // Test (5): if symbol is an instance method of a raw type, issue
4996 // an unchecked warning if its argument types change under erasure.
4997 if ((sym.flags() & STATIC) == 0 &&
4998 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4999 Type s = types.asOuterSuper(site, sym.owner);
5000 if (s != null && s.isRaw() &&
5001 !types.isSameTypes(sym.type.getParameterTypes(),
5002 sym.erasure(types).getParameterTypes())) {
5003 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
5004 }
5005 }
5006
5007 if (env.info.defaultSuperCallSite != null) {
5008 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5009 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5010 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5011 List<MethodSymbol> icand_sup =
5012 types.interfaceCandidates(sup, (MethodSymbol)sym);
5013 if (icand_sup.nonEmpty() &&
5014 icand_sup.head != sym &&
5015 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5016 log.error(env.tree.pos(),
5017 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5018 break;
5019 }
5020 }
5021 env.info.defaultSuperCallSite = null;
5022 }
5023
5024 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5025 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5026 if (app.meth.hasTag(SELECT) &&
5027 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5028 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5029 }
5030 }
5031
5032 // Compute the identifier's instantiated type.
5033 // For methods, we need to compute the instance type by
5034 // Resolve.instantiate from the symbol's type as well as
5035 // any type arguments and value arguments.
5036 Warner noteWarner = new Warner();
5037 try {
5038 Type owntype = rs.checkMethod(
5039 env,
5040 site,
5041 sym,
5042 resultInfo,
5043 argtypes,
5044 typeargtypes,
5045 noteWarner);
5046
5047 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5048 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5049
5050 argtypes = argtypes.map(checkDeferredMap);
5051
5052 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5053 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5054 sym.name,
5055 rs.methodArguments(sym.type.getParameterTypes()),
5056 rs.methodArguments(argtypes.map(checkDeferredMap)),
5057 kindName(sym.location()),
5058 sym.location()));
5059 if (resultInfo.pt != Infer.anyPoly ||
5060 !owntype.hasTag(METHOD) ||
5061 !owntype.isPartial()) {
5062 //if this is not a partially inferred method type, erase return type. Otherwise,
5063 //erasure is carried out in PartiallyInferredMethodType.check().
5064 owntype = new MethodType(owntype.getParameterTypes(),
5065 types.erasure(owntype.getReturnType()),
5066 types.erasure(owntype.getThrownTypes()),
5067 syms.methodClass);
5068 }
5069 }
5070
5071 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5072 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5073 PolyKind.POLY : PolyKind.STANDALONE;
5074 TreeInfo.setPolyKind(env.tree, pkind);
5075
5076 return (resultInfo.pt == Infer.anyPoly) ?
5077 owntype :
5078 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5079 resultInfo.checkContext.inferenceContext());
5080 } catch (Infer.InferenceException ex) {
5081 //invalid target type - propagate exception outwards or report error
5082 //depending on the current check context
5083 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5084 return types.createErrorType(site);
5085 } catch (Resolve.InapplicableMethodException ex) {
5086 final JCDiagnostic diag = ex.getDiagnostic();
5087 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5088 @Override
5089 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5090 return new Pair<>(sym, diag);
5091 }
5092 };
5093 List<Type> argtypes2 = argtypes.map(
5094 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5095 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5096 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5097 log.report(errDiag);
5098 return types.createErrorType(site);
5099 }
5100 }
5101
5102 public void visitLiteral(JCLiteral tree) {
5103 result = check(tree, litType(tree.typetag).constType(tree.value),
5104 KindSelector.VAL, resultInfo);
5105 }
5106 //where
5107 /** Return the type of a literal with given type tag.
5108 */
5109 Type litType(TypeTag tag) {
5110 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5111 }
5112
5113 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5114 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5115 }
5116
5117 public void visitTypeArray(JCArrayTypeTree tree) {
5118 Type etype = attribType(tree.elemtype, env);
5119 Type type = new ArrayType(etype, syms.arrayClass);
5120 result = check(tree, type, KindSelector.TYP, resultInfo);
5121 }
5122
5123 /** Visitor method for parameterized types.
5124 * Bound checking is left until later, since types are attributed
5125 * before supertype structure is completely known
5126 */
5127 public void visitTypeApply(JCTypeApply tree) {
5128 Type owntype = types.createErrorType(tree.type);
5129
5130 // Attribute functor part of application and make sure it's a class.
5131 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5132
5133 // Attribute type parameters
5134 List<Type> actuals = attribTypes(tree.arguments, env);
5135
5136 if (clazztype.hasTag(CLASS)) {
5137 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5138 if (actuals.isEmpty()) //diamond
5139 actuals = formals;
5140
5141 if (actuals.length() == formals.length()) {
5142 List<Type> a = actuals;
5143 List<Type> f = formals;
5144 while (a.nonEmpty()) {
5145 a.head = a.head.withTypeVar(f.head);
5146 a = a.tail;
5147 f = f.tail;
5148 }
5149 // Compute the proper generic outer
5150 Type clazzOuter = clazztype.getEnclosingType();
5151 if (clazzOuter.hasTag(CLASS)) {
5152 Type site;
5153 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5154 if (clazz.hasTag(IDENT)) {
5155 site = env.enclClass.sym.type;
5156 } else if (clazz.hasTag(SELECT)) {
5157 site = ((JCFieldAccess) clazz).selected.type;
5158 } else throw new AssertionError(""+tree);
5159 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5160 if (site.hasTag(CLASS) || site.hasTag(TYPEVAR))
5161 site = types.asEnclosingSuper(site, clazzOuter.tsym);
5162 if (site == null)
5163 site = types.erasure(clazzOuter);
5164 clazzOuter = site;
5165 }
5166 }
5167 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5168 clazztype.getMetadata());
5169 } else {
5170 if (formals.length() != 0) {
5171 log.error(tree.pos(),
5172 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5173 } else {
5174 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5175 }
5176 owntype = types.createErrorType(tree.type);
5177 }
5178 } else if (clazztype.hasTag(ERROR)) {
5179 ErrorType parameterizedErroneous =
5180 new ErrorType(clazztype.getOriginalType(),
5181 clazztype.tsym,
5182 clazztype.getMetadata());
5183
5184 parameterizedErroneous.typarams_field = actuals;
5185 owntype = parameterizedErroneous;
5186 }
5187 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5188 }
5189
5190 public void visitTypeUnion(JCTypeUnion tree) {
5191 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5192 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5193 for (JCExpression typeTree : tree.alternatives) {
5194 Type ctype = attribType(typeTree, env);
5195 ctype = chk.checkType(typeTree.pos(),
5196 chk.checkClassType(typeTree.pos(), ctype),
5197 syms.throwableType,
5198 chk.subtypeHandler);
5199 if (!ctype.isErroneous()) {
5200 //check that alternatives of a union type are pairwise
5201 //unrelated w.r.t. subtyping
5202 if (chk.intersects(ctype, multicatchTypes.toList())) {
5203 for (Type t : multicatchTypes) {
5204 boolean sub = types.isSubtype(ctype, t);
5205 boolean sup = types.isSubtype(t, ctype);
5206 if (sub || sup) {
5207 //assume 'a' <: 'b'
5208 Type a = sub ? ctype : t;
5209 Type b = sub ? t : ctype;
5210 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5211 }
5212 }
5213 }
5214 multicatchTypes.append(ctype);
5215 if (all_multicatchTypes != null)
5216 all_multicatchTypes.append(ctype);
5217 } else {
5218 if (all_multicatchTypes == null) {
5219 all_multicatchTypes = new ListBuffer<>();
5220 all_multicatchTypes.appendList(multicatchTypes);
5221 }
5222 all_multicatchTypes.append(ctype);
5223 }
5224 }
5225 Type t = check(tree, types.lub(multicatchTypes.toList()),
5226 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5227 if (t.hasTag(CLASS)) {
5228 List<Type> alternatives =
5229 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5230 t = new UnionClassType((ClassType) t, alternatives);
5231 }
5232 tree.type = result = t;
5233 }
5234
5235 public void visitTypeIntersection(JCTypeIntersection tree) {
5236 attribTypes(tree.bounds, env);
5237 tree.type = result = checkIntersection(tree, tree.bounds);
5238 }
5239
5240 public void visitTypeParameter(JCTypeParameter tree) {
5241 TypeVar typeVar = (TypeVar) tree.type;
5242
5243 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5244 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5245 }
5246
5247 if (!typeVar.getUpperBound().isErroneous()) {
5248 //fixup type-parameter bound computed in 'attribTypeVariables'
5249 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5250 }
5251 }
5252
5253 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5254 Set<Symbol> boundSet = new HashSet<>();
5255 if (bounds.nonEmpty()) {
5256 // accept class or interface or typevar as first bound.
5257 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5258 boundSet.add(types.erasure(bounds.head.type).tsym);
5259 if (bounds.head.type.isErroneous()) {
5260 return bounds.head.type;
5261 }
5262 else if (bounds.head.type.hasTag(TYPEVAR)) {
5263 // if first bound was a typevar, do not accept further bounds.
5264 if (bounds.tail.nonEmpty()) {
5265 log.error(bounds.tail.head.pos(),
5266 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5267 return bounds.head.type;
5268 }
5269 } else {
5270 // if first bound was a class or interface, accept only interfaces
5271 // as further bounds.
5272 for (JCExpression bound : bounds.tail) {
5273 bound.type = checkBase(bound.type, bound, env, false, true, false);
5274 if (bound.type.isErroneous()) {
5275 bounds = List.of(bound);
5276 }
5277 else if (bound.type.hasTag(CLASS)) {
5278 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5279 }
5280 }
5281 }
5282 }
5283
5284 if (bounds.length() == 0) {
5285 return syms.objectType;
5286 } else if (bounds.length() == 1) {
5287 return bounds.head.type;
5288 } else {
5289 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5290 // ... the variable's bound is a class type flagged COMPOUND
5291 // (see comment for TypeVar.bound).
5292 // In this case, generate a class tree that represents the
5293 // bound class, ...
5294 JCExpression extending;
5295 List<JCExpression> implementing;
5296 if (!bounds.head.type.isInterface()) {
5297 extending = bounds.head;
5298 implementing = bounds.tail;
5299 } else {
5300 extending = null;
5301 implementing = bounds;
5302 }
5303 JCClassDecl cd = make.at(tree).ClassDef(
5304 make.Modifiers(PUBLIC | ABSTRACT),
5305 names.empty, List.nil(),
5306 extending, implementing, List.nil());
5307
5308 ClassSymbol c = (ClassSymbol)owntype.tsym;
5309 Assert.check((c.flags() & COMPOUND) != 0);
5310 cd.sym = c;
5311 c.sourcefile = env.toplevel.sourcefile;
5312
5313 // ... and attribute the bound class
5314 c.flags_field |= UNATTRIBUTED;
5315 Env<AttrContext> cenv = enter.classEnv(cd, env);
5316 typeEnvs.put(c, cenv);
5317 attribClass(c);
5318 return owntype;
5319 }
5320 }
5321
5322 public void visitWildcard(JCWildcard tree) {
5323 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5324 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5325 ? syms.objectType
5326 : attribType(tree.inner, env);
5327 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5328 tree.kind.kind,
5329 syms.boundClass),
5330 KindSelector.TYP, resultInfo);
5331 }
5332
5333 public void visitAnnotation(JCAnnotation tree) {
5334 Assert.error("should be handled in annotate");
5335 }
5336
5337 @Override
5338 public void visitModifiers(JCModifiers tree) {
5339 //error recovery only:
5340 Assert.check(resultInfo.pkind == KindSelector.ERR);
5341
5342 attribAnnotationTypes(tree.annotations, env);
5343 }
5344
5345 public void visitAnnotatedType(JCAnnotatedType tree) {
5346 attribAnnotationTypes(tree.annotations, env);
5347 Type underlyingType = attribTree(tree.underlyingType, env, resultInfo);
5348 if (underlyingType.getTag() == PACKAGE || underlyingType.getTag() == VOID) {
5349 result = tree.type = underlyingType;
5350 } else {
5351 Type annotatedType = underlyingType.preannotatedType();
5352
5353 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5354 result = tree.type = annotatedType;
5355 }
5356 }
5357
5358 public void visitErroneous(JCErroneous tree) {
5359 if (tree.errs != null) {
5360 WriteableScope newScope = env.info.scope;
5361
5362 if (env.tree instanceof JCClassDecl) {
5363 Symbol fakeOwner =
5364 new MethodSymbol(BLOCK, names.empty, null,
5365 env.info.scope.owner);
5366 newScope = newScope.dupUnshared(fakeOwner);
5367 }
5368
5369 Env<AttrContext> errEnv =
5370 env.dup(env.tree,
5371 env.info.dup(newScope));
5372 errEnv.info.returnResult = unknownExprInfo;
5373 for (JCTree err : tree.errs)
5374 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5375 }
5376 result = tree.type = syms.errType;
5377 }
5378
5379 /** Default visitor method for all other trees.
5380 */
5381 public void visitTree(JCTree tree) {
5382 throw new AssertionError();
5383 }
5384
5385 /**
5386 * Attribute an env for either a top level tree or class or module declaration.
5387 */
5388 public void attrib(Env<AttrContext> env) {
5389 switch (env.tree.getTag()) {
5390 case MODULEDEF:
5391 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5392 break;
5393 case PACKAGEDEF:
5394 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5395 break;
5396 default:
5397 attribClass(env.tree.pos(), env.enclClass.sym);
5398 }
5399
5400 annotate.flush();
5401
5402 // Now that this tree is attributed, we can calculate the Lint configuration everywhere within it
5403 lintMapper.calculateLints(env.toplevel.sourcefile, env.tree);
5404 }
5405
5406 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5407 try {
5408 annotate.flush();
5409 attribPackage(p);
5410 } catch (CompletionFailure ex) {
5411 chk.completionError(pos, ex);
5412 }
5413 }
5414
5415 void attribPackage(PackageSymbol p) {
5416 attribWithLint(p,
5417 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5418 }
5419
5420 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5421 try {
5422 annotate.flush();
5423 attribModule(m);
5424 } catch (CompletionFailure ex) {
5425 chk.completionError(pos, ex);
5426 }
5427 }
5428
5429 void attribModule(ModuleSymbol m) {
5430 attribWithLint(m, env -> attribStat(env.tree, env));
5431 }
5432
5433 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5434 Env<AttrContext> env = typeEnvs.get(sym);
5435
5436 Env<AttrContext> lintEnv = env;
5437 while (lintEnv.info.lint == null)
5438 lintEnv = lintEnv.next;
5439
5440 Lint lint = lintEnv.info.lint.augment(sym);
5441
5442 Lint prevLint = chk.setLint(lint);
5443 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5444
5445 try {
5446 attrib.accept(env);
5447 } finally {
5448 log.useSource(prev);
5449 chk.setLint(prevLint);
5450 }
5451 }
5452
5453 /** Main method: attribute class definition associated with given class symbol.
5454 * reporting completion failures at the given position.
5455 * @param pos The source position at which completion errors are to be
5456 * reported.
5457 * @param c The class symbol whose definition will be attributed.
5458 */
5459 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5460 try {
5461 annotate.flush();
5462 attribClass(c);
5463 } catch (CompletionFailure ex) {
5464 chk.completionError(pos, ex);
5465 }
5466 }
5467
5468 /** Attribute class definition associated with given class symbol.
5469 * @param c The class symbol whose definition will be attributed.
5470 */
5471 void attribClass(ClassSymbol c) throws CompletionFailure {
5472 if (c.type.hasTag(ERROR)) return;
5473
5474 // Check for cycles in the inheritance graph, which can arise from
5475 // ill-formed class files.
5476 chk.checkNonCyclic(null, c.type);
5477
5478 Type st = types.supertype(c.type);
5479 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5480 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0 &&
5481 breakTree == null) {
5482 // First, attribute superclass.
5483 if (st.hasTag(CLASS))
5484 attribClass((ClassSymbol)st.tsym);
5485
5486 // Next attribute owner, if it is a class.
5487 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5488 attribClass((ClassSymbol)c.owner);
5489
5490 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5491 }
5492
5493 // The previous operations might have attributed the current class
5494 // if there was a cycle. So we test first whether the class is still
5495 // UNATTRIBUTED.
5496 if ((c.flags_field & UNATTRIBUTED) != 0) {
5497 c.flags_field &= ~UNATTRIBUTED;
5498
5499 // Get environment current at the point of class definition.
5500 Env<AttrContext> env = typeEnvs.get(c);
5501
5502 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5503 // because the annotations were not available at the time the env was created. Therefore,
5504 // we look up the environment chain for the first enclosing environment for which the
5505 // lint value is set. Typically, this is the parent env, but might be further if there
5506 // are any envs created as a result of TypeParameter nodes.
5507 Env<AttrContext> lintEnv = env;
5508 while (lintEnv.info.lint == null)
5509 lintEnv = lintEnv.next;
5510
5511 // Having found the enclosing lint value, we can initialize the lint value for this class
5512 env.info.lint = lintEnv.info.lint.augment(c);
5513
5514 Lint prevLint = chk.setLint(env.info.lint);
5515 JavaFileObject prev = log.useSource(c.sourcefile);
5516 ResultInfo prevReturnRes = env.info.returnResult;
5517
5518 try {
5519 if (c.isSealed() &&
5520 !c.isEnum() &&
5521 !c.isPermittedExplicit &&
5522 c.getPermittedSubclasses().isEmpty()) {
5523 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5524 }
5525
5526 if (c.isSealed()) {
5527 Set<Symbol> permittedTypes = new HashSet<>();
5528 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5529 for (Type subType : c.getPermittedSubclasses()) {
5530 if (subType.isErroneous()) {
5531 // the type already caused errors, don't produce more potentially misleading errors
5532 continue;
5533 }
5534 boolean isTypeVar = false;
5535 if (subType.getTag() == TYPEVAR) {
5536 isTypeVar = true; //error recovery
5537 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5538 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5539 }
5540 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5541 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5542 }
5543 if (permittedTypes.contains(subType.tsym)) {
5544 DiagnosticPosition pos =
5545 env.enclClass.permitting.stream()
5546 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5547 .limit(2).collect(List.collector()).get(1);
5548 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5549 } else {
5550 permittedTypes.add(subType.tsym);
5551 }
5552 if (sealedInUnnamed) {
5553 if (subType.tsym.packge() != c.packge()) {
5554 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5555 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5556 );
5557 }
5558 } else if (subType.tsym.packge().modle != c.packge().modle) {
5559 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5560 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5561 );
5562 }
5563 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5564 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5565 Errors.InvalidPermitsClause(
5566 subType.tsym == c.type.tsym ?
5567 Fragments.MustNotBeSameClass :
5568 Fragments.MustNotBeSupertype(subType)
5569 )
5570 );
5571 } else if (!isTypeVar) {
5572 boolean thisIsASuper = types.directSupertypes(subType)
5573 .stream()
5574 .anyMatch(d -> d.tsym == c);
5575 if (!thisIsASuper) {
5576 if(c.isInterface()) {
5577 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5578 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5579 } else {
5580 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5581 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5582 }
5583 }
5584 }
5585 }
5586 }
5587
5588 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5589 .stream()
5590 .filter(s -> s.tsym.isSealed())
5591 .map(s -> (ClassSymbol) s.tsym)
5592 .collect(List.collector());
5593
5594 if (sealedSupers.isEmpty()) {
5595 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5596 boolean hasErrorSuper = false;
5597
5598 hasErrorSuper |= types.directSupertypes(c.type)
5599 .stream()
5600 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5601
5602 ClassType ct = (ClassType) c.type;
5603
5604 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5605
5606 if (!hasErrorSuper) {
5607 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5608 }
5609 }
5610 } else {
5611 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5612 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5613 }
5614
5615 if (!c.type.isCompound()) {
5616 for (ClassSymbol supertypeSym : sealedSupers) {
5617 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5618 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5619 }
5620 }
5621 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5622 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5623 c.isInterface() ?
5624 Errors.NonSealedOrSealedExpected :
5625 Errors.NonSealedSealedOrFinalExpected);
5626 }
5627 }
5628 }
5629
5630 env.info.returnResult = null;
5631 // java.lang.Enum may not be subclassed by a non-enum
5632 if (st.tsym == syms.enumSym &&
5633 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5634 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5635
5636 // Enums may not be extended by source-level classes
5637 if (st.tsym != null &&
5638 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5639 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5640 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5641 }
5642
5643 if (rs.isSerializable(c.type)) {
5644 env.info.isSerializable = true;
5645 }
5646
5647 attribClassBody(env, c);
5648
5649 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5650 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5651 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5652 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5653
5654 if (c.isImplicit()) {
5655 chk.checkHasMain(env.tree.pos(), c);
5656 }
5657 } finally {
5658 env.info.returnResult = prevReturnRes;
5659 log.useSource(prev);
5660 chk.setLint(prevLint);
5661 }
5662
5663 }
5664 }
5665
5666 public void visitImport(JCImport tree) {
5667 // nothing to do
5668 }
5669
5670 public void visitModuleDef(JCModuleDecl tree) {
5671 tree.sym.completeUsesProvides();
5672 ModuleSymbol msym = tree.sym;
5673 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5674 Lint prevLint = chk.setLint(lint);
5675 try {
5676 chk.checkModuleName(tree);
5677 chk.checkDeprecatedAnnotation(tree, msym);
5678 } finally {
5679 chk.setLint(prevLint);
5680 }
5681 }
5682
5683 /** Finish the attribution of a class. */
5684 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5685 JCClassDecl tree = (JCClassDecl)env.tree;
5686 Assert.check(c == tree.sym);
5687
5688 // Validate type parameters, supertype and interfaces.
5689 attribStats(tree.typarams, env);
5690 if (!c.isAnonymous()) {
5691 //already checked if anonymous
5692 chk.validate(tree.typarams, env);
5693 chk.validate(tree.extending, env);
5694 chk.validate(tree.implementing, env);
5695 }
5696
5697 chk.checkRequiresIdentity(tree, env.info.lint);
5698
5699 c.markAbstractIfNeeded(types);
5700
5701 // If this is a non-abstract class, check that it has no abstract
5702 // methods or unimplemented methods of an implemented interface.
5703 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5704 chk.checkAllDefined(tree.pos(), c);
5705 }
5706
5707 if ((c.flags() & ANNOTATION) != 0) {
5708 if (tree.implementing.nonEmpty())
5709 log.error(tree.implementing.head.pos(),
5710 Errors.CantExtendIntfAnnotation);
5711 if (tree.typarams.nonEmpty()) {
5712 log.error(tree.typarams.head.pos(),
5713 Errors.IntfAnnotationCantHaveTypeParams(c));
5714 }
5715
5716 // If this annotation type has a @Repeatable, validate
5717 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5718 // If this annotation type has a @Repeatable, validate
5719 if (repeatable != null) {
5720 // get diagnostic position for error reporting
5721 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5722 Assert.checkNonNull(cbPos);
5723
5724 chk.validateRepeatable(c, repeatable, cbPos);
5725 }
5726 } else {
5727 try {
5728 // Check that all extended classes and interfaces
5729 // are compatible (i.e. no two define methods with same arguments
5730 // yet different return types). (JLS 8.4.8.3)
5731 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5732 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5733 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5734 } catch (CompletionFailure cf) {
5735 chk.completionError(tree.pos(), cf);
5736 }
5737 }
5738
5739 // Check that class does not import the same parameterized interface
5740 // with two different argument lists.
5741 chk.checkClassBounds(tree.pos(), c.type);
5742
5743 tree.type = c.type;
5744
5745 for (List<JCTypeParameter> l = tree.typarams;
5746 l.nonEmpty(); l = l.tail) {
5747 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5748 }
5749
5750 // Check that a generic class doesn't extend Throwable
5751 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5752 log.error(tree.extending.pos(), Errors.GenericThrowable);
5753
5754 // Check that all methods which implement some
5755 // method conform to the method they implement.
5756 chk.checkImplementations(tree);
5757
5758 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5759 checkAutoCloseable(env, tree, false);
5760
5761 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5762 // Attribute declaration
5763 attribStat(l.head, env);
5764 // Check that declarations in inner classes are not static (JLS 8.1.2)
5765 // Make an exception for static constants.
5766 if (!allowRecords &&
5767 c.owner.kind != PCK &&
5768 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5769 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5770 VarSymbol sym = null;
5771 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5772 if (sym == null ||
5773 sym.kind != VAR ||
5774 sym.getConstValue() == null)
5775 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5776 }
5777 }
5778
5779 // Check for proper placement of super()/this() calls.
5780 chk.checkSuperInitCalls(tree);
5781
5782 // Check for cycles among non-initial constructors.
5783 chk.checkCyclicConstructors(tree);
5784
5785 // Check for cycles among annotation elements.
5786 chk.checkNonCyclicElements(tree);
5787
5788 // Check for proper use of serialVersionUID and other
5789 // serialization-related fields and methods
5790 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5791 && rs.isSerializable(c.type)
5792 && !c.isAnonymous()) {
5793 chk.checkSerialStructure(env, tree, c);
5794 }
5795 // Correctly organize the positions of the type annotations
5796 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5797
5798 // Check type annotations applicability rules
5799 validateTypeAnnotations(tree, false);
5800 }
5801 // where
5802 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5803 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5804 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5805 if (types.isSameType(al.head.annotationType.type, t))
5806 return al.head.pos();
5807 }
5808
5809 return null;
5810 }
5811
5812 private Type capture(Type type) {
5813 return types.capture(type);
5814 }
5815
5816 private void setupImplicitlyTypedVariable(JCVariableDecl tree, Type type) {
5817 Assert.check(tree.isImplicitlyTyped());
5818
5819 type.complete();
5820
5821 if (tree.vartype == null) {
5822 return ;
5823 }
5824
5825 Assert.check(tree.vartype.hasTag(VARTYPE));
5826
5827 JCVarType vartype = (JCVarType) tree.vartype;
5828
5829 vartype.type = type;
5830 }
5831
5832 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5833 tree.accept(new TypeAnnotationsValidator(sigOnly));
5834 }
5835 //where
5836 private final class TypeAnnotationsValidator extends TreeScanner {
5837
5838 private final boolean sigOnly;
5839 public TypeAnnotationsValidator(boolean sigOnly) {
5840 this.sigOnly = sigOnly;
5841 }
5842
5843 public void visitAnnotation(JCAnnotation tree) {
5844 chk.validateTypeAnnotation(tree, null, false);
5845 super.visitAnnotation(tree);
5846 }
5847 public void visitAnnotatedType(JCAnnotatedType tree) {
5848 if (!tree.underlyingType.type.isErroneous()) {
5849 super.visitAnnotatedType(tree);
5850 }
5851 }
5852 public void visitTypeParameter(JCTypeParameter tree) {
5853 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5854 scan(tree.bounds);
5855 // Don't call super.
5856 // This is needed because above we call validateTypeAnnotation with
5857 // false, which would forbid annotations on type parameters.
5858 // super.visitTypeParameter(tree);
5859 }
5860 public void visitMethodDef(JCMethodDecl tree) {
5861 if (tree.recvparam != null &&
5862 !tree.recvparam.vartype.type.isErroneous()) {
5863 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5864 }
5865 if (tree.restype != null && tree.restype.type != null) {
5866 validateAnnotatedType(tree.restype, tree.restype.type);
5867 }
5868 if (sigOnly) {
5869 scan(tree.mods);
5870 scan(tree.restype);
5871 scan(tree.typarams);
5872 scan(tree.recvparam);
5873 scan(tree.params);
5874 scan(tree.thrown);
5875 } else {
5876 scan(tree.defaultValue);
5877 scan(tree.body);
5878 }
5879 }
5880 public void visitVarDef(final JCVariableDecl tree) {
5881 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5882 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5883 validateAnnotatedType(tree.vartype, tree.sym.type);
5884 scan(tree.mods);
5885 scan(tree.vartype);
5886 if (!sigOnly) {
5887 scan(tree.init);
5888 }
5889 }
5890 public void visitTypeCast(JCTypeCast tree) {
5891 if (tree.clazz != null && tree.clazz.type != null)
5892 validateAnnotatedType(tree.clazz, tree.clazz.type);
5893 super.visitTypeCast(tree);
5894 }
5895 public void visitTypeTest(JCInstanceOf tree) {
5896 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5897 validateAnnotatedType(tree.pattern, tree.pattern.type);
5898 super.visitTypeTest(tree);
5899 }
5900 public void visitNewClass(JCNewClass tree) {
5901 if (tree.clazz != null && tree.clazz.type != null) {
5902 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5903 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5904 tree.clazz.type.tsym);
5905 }
5906 if (tree.def != null) {
5907 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5908 }
5909
5910 validateAnnotatedType(tree.clazz, tree.clazz.type);
5911 }
5912 super.visitNewClass(tree);
5913 }
5914 public void visitNewArray(JCNewArray tree) {
5915 if (tree.elemtype != null && tree.elemtype.type != null) {
5916 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5917 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5918 tree.elemtype.type.tsym);
5919 }
5920 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5921 }
5922 super.visitNewArray(tree);
5923 }
5924 public void visitClassDef(JCClassDecl tree) {
5925 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5926 if (sigOnly) {
5927 scan(tree.mods);
5928 scan(tree.typarams);
5929 scan(tree.extending);
5930 scan(tree.implementing);
5931 }
5932 for (JCTree member : tree.defs) {
5933 if (member.hasTag(Tag.CLASSDEF)) {
5934 continue;
5935 }
5936 scan(member);
5937 }
5938 }
5939 public void visitBlock(JCBlock tree) {
5940 if (!sigOnly) {
5941 scan(tree.stats);
5942 }
5943 }
5944
5945 /* I would want to model this after
5946 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5947 * and override visitSelect and visitTypeApply.
5948 * However, we only set the annotated type in the top-level type
5949 * of the symbol.
5950 * Therefore, we need to override each individual location where a type
5951 * can occur.
5952 */
5953 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5954 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5955
5956 if (type.isPrimitiveOrVoid()) {
5957 return;
5958 }
5959
5960 JCTree enclTr = errtree;
5961 Type enclTy = type;
5962
5963 boolean repeat = true;
5964 while (repeat) {
5965 if (enclTr.hasTag(TYPEAPPLY)) {
5966 List<Type> tyargs = enclTy.getTypeArguments();
5967 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5968 if (trargs.length() > 0) {
5969 // Nothing to do for diamonds
5970 if (tyargs.length() == trargs.length()) {
5971 for (int i = 0; i < tyargs.length(); ++i) {
5972 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5973 }
5974 }
5975 // If the lengths don't match, it's either a diamond
5976 // or some nested type that redundantly provides
5977 // type arguments in the tree.
5978 }
5979
5980 // Look at the clazz part of a generic type
5981 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5982 }
5983
5984 if (enclTr.hasTag(SELECT)) {
5985 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5986 if (enclTy != null &&
5987 !enclTy.hasTag(NONE)) {
5988 enclTy = enclTy.getEnclosingType();
5989 }
5990 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5991 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5992 if (enclTy == null || enclTy.hasTag(NONE)) {
5993 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5994 for (JCAnnotation an : at.getAnnotations()) {
5995 if (chk.isTypeAnnotation(an, false)) {
5996 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5997 }
5998 }
5999 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
6000 if (!onlyTypeAnnotations.isEmpty()) {
6001 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
6002 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
6003 Fragments.TypeAnnotation(onlyTypeAnnotations);
6004 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
6005 type.stripMetadata().annotatedType(onlyTypeAnnotations));
6006 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
6007 type.tsym.owner, annotatedType));
6008 }
6009 repeat = false;
6010 }
6011 enclTr = at.underlyingType;
6012 // enclTy doesn't need to be changed
6013 } else if (enclTr.hasTag(IDENT)) {
6014 repeat = false;
6015 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6016 JCWildcard wc = (JCWildcard) enclTr;
6017 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6018 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6019 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6020 } else {
6021 // Nothing to do for UNBOUND
6022 }
6023 repeat = false;
6024 } else if (enclTr.hasTag(TYPEARRAY)) {
6025 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6026 validateAnnotatedType(art.getType(), art.elemtype.type);
6027 repeat = false;
6028 } else if (enclTr.hasTag(TYPEUNION)) {
6029 JCTypeUnion ut = (JCTypeUnion) enclTr;
6030 for (JCTree t : ut.getTypeAlternatives()) {
6031 validateAnnotatedType(t, t.type);
6032 }
6033 repeat = false;
6034 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6035 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6036 for (JCTree t : it.getBounds()) {
6037 validateAnnotatedType(t, t.type);
6038 }
6039 repeat = false;
6040 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6041 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6042 repeat = false;
6043 } else {
6044 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6045 " within: "+ errtree + " with kind: " + errtree.getKind());
6046 }
6047 }
6048 }
6049
6050 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6051 Symbol sym) {
6052 // Ensure that no declaration annotations are present.
6053 // Note that a tree type might be an AnnotatedType with
6054 // empty annotations, if only declaration annotations were given.
6055 // This method will raise an error for such a type.
6056 for (JCAnnotation ai : annotations) {
6057 if (!ai.type.isErroneous() &&
6058 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6059 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6060 }
6061 }
6062 }
6063 }
6064
6065 // <editor-fold desc="post-attribution visitor">
6066
6067 /**
6068 * Handle missing types/symbols in an AST. This routine is useful when
6069 * the compiler has encountered some errors (which might have ended up
6070 * terminating attribution abruptly); if the compiler is used in fail-over
6071 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6072 * prevents NPE to be propagated during subsequent compilation steps.
6073 */
6074 public void postAttr(JCTree tree) {
6075 new PostAttrAnalyzer().scan(tree);
6076 }
6077
6078 class PostAttrAnalyzer extends TreeScanner {
6079
6080 private void initTypeIfNeeded(JCTree that) {
6081 if (that.type == null) {
6082 if (that.hasTag(METHODDEF)) {
6083 that.type = dummyMethodType((JCMethodDecl)that);
6084 } else {
6085 that.type = syms.unknownType;
6086 }
6087 }
6088 }
6089
6090 /* Construct a dummy method type. If we have a method declaration,
6091 * and the declared return type is void, then use that return type
6092 * instead of UNKNOWN to avoid spurious error messages in lambda
6093 * bodies (see:JDK-8041704).
6094 */
6095 private Type dummyMethodType(JCMethodDecl md) {
6096 Type restype = syms.unknownType;
6097 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6098 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6099 if (prim.typetag == VOID)
6100 restype = syms.voidType;
6101 }
6102 return new MethodType(List.nil(), restype,
6103 List.nil(), syms.methodClass);
6104 }
6105 private Type dummyMethodType() {
6106 return dummyMethodType(null);
6107 }
6108
6109 @Override
6110 public void scan(JCTree tree) {
6111 if (tree == null) return;
6112 if (tree instanceof JCExpression) {
6113 initTypeIfNeeded(tree);
6114 }
6115 super.scan(tree);
6116 }
6117
6118 @Override
6119 public void visitIdent(JCIdent that) {
6120 if (that.sym == null) {
6121 that.sym = syms.unknownSymbol;
6122 }
6123 }
6124
6125 @Override
6126 public void visitSelect(JCFieldAccess that) {
6127 if (that.sym == null) {
6128 that.sym = syms.unknownSymbol;
6129 }
6130 super.visitSelect(that);
6131 }
6132
6133 @Override
6134 public void visitClassDef(JCClassDecl that) {
6135 initTypeIfNeeded(that);
6136 if (that.sym == null) {
6137 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6138 }
6139 super.visitClassDef(that);
6140 }
6141
6142 @Override
6143 public void visitMethodDef(JCMethodDecl that) {
6144 initTypeIfNeeded(that);
6145 if (that.sym == null) {
6146 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6147 }
6148 super.visitMethodDef(that);
6149 }
6150
6151 @Override
6152 public void visitVarDef(JCVariableDecl that) {
6153 initTypeIfNeeded(that);
6154 if (that.sym == null) {
6155 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6156 that.sym.adr = 0;
6157 }
6158 super.visitVarDef(that);
6159 }
6160
6161 @Override
6162 public void visitBindingPattern(JCBindingPattern that) {
6163 initTypeIfNeeded(that);
6164 initTypeIfNeeded(that.var);
6165 if (that.var.sym == null) {
6166 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6167 that.var.sym.adr = 0;
6168 }
6169 super.visitBindingPattern(that);
6170 }
6171
6172 @Override
6173 public void visitRecordPattern(JCRecordPattern that) {
6174 initTypeIfNeeded(that);
6175 if (that.record == null) {
6176 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6177 that.type, syms.noSymbol);
6178 }
6179 if (that.fullComponentTypes == null) {
6180 that.fullComponentTypes = List.nil();
6181 }
6182 super.visitRecordPattern(that);
6183 }
6184
6185 @Override
6186 public void visitNewClass(JCNewClass that) {
6187 if (that.constructor == null) {
6188 that.constructor = new MethodSymbol(0, names.init,
6189 dummyMethodType(), syms.noSymbol);
6190 }
6191 if (that.constructorType == null) {
6192 that.constructorType = syms.unknownType;
6193 }
6194 super.visitNewClass(that);
6195 }
6196
6197 @Override
6198 public void visitAssignop(JCAssignOp that) {
6199 if (that.operator == null) {
6200 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6201 -1, syms.noSymbol);
6202 }
6203 super.visitAssignop(that);
6204 }
6205
6206 @Override
6207 public void visitBinary(JCBinary that) {
6208 if (that.operator == null) {
6209 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6210 -1, syms.noSymbol);
6211 }
6212 super.visitBinary(that);
6213 }
6214
6215 @Override
6216 public void visitUnary(JCUnary that) {
6217 if (that.operator == null) {
6218 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6219 -1, syms.noSymbol);
6220 }
6221 super.visitUnary(that);
6222 }
6223
6224 @Override
6225 public void visitReference(JCMemberReference that) {
6226 super.visitReference(that);
6227 if (that.sym == null) {
6228 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6229 syms.noSymbol);
6230 }
6231 }
6232
6233 @Override
6234 public void visitVarType(JCVarType that) {
6235 initTypeIfNeeded(that);
6236 }
6237 }
6238 // </editor-fold>
6239
6240 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6241 new TreeScanner() {
6242 Symbol packge = pkg;
6243 @Override
6244 public void visitIdent(JCIdent that) {
6245 that.sym = packge;
6246 }
6247
6248 @Override
6249 public void visitSelect(JCFieldAccess that) {
6250 that.sym = packge;
6251 packge = packge.owner;
6252 super.visitSelect(that);
6253 }
6254 }.scan(pid);
6255 }
6256
6257 }