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