1 /*
2 * Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.LintMapper;
45 import com.sun.tools.javac.code.Scope.WriteableScope;
46 import com.sun.tools.javac.code.Source.Feature;
47 import com.sun.tools.javac.code.Symbol.*;
48 import com.sun.tools.javac.code.Type.*;
49 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
50 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
51 import com.sun.tools.javac.comp.Check.CheckContext;
52 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
53 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
54 import com.sun.tools.javac.jvm.*;
55
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
59
60 import com.sun.tools.javac.resources.CompilerProperties.Errors;
61 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
62 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
63 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
64 import com.sun.tools.javac.tree.*;
65 import com.sun.tools.javac.tree.JCTree.*;
66 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
67 import com.sun.tools.javac.util.*;
68 import com.sun.tools.javac.util.DefinedBy.Api;
69 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
70 import com.sun.tools.javac.util.JCDiagnostic.Error;
71 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
72 import com.sun.tools.javac.util.JCDiagnostic.Warning;
73 import com.sun.tools.javac.util.List;
74
75 import static com.sun.tools.javac.code.Flags.*;
76 import static com.sun.tools.javac.code.Flags.ANNOTATION;
77 import static com.sun.tools.javac.code.Flags.BLOCK;
78 import static com.sun.tools.javac.code.Kinds.*;
79 import static com.sun.tools.javac.code.Kinds.Kind.*;
80 import static com.sun.tools.javac.code.TypeTag.*;
81 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
82 import static com.sun.tools.javac.tree.JCTree.Tag.*;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final LintMapper lintMapper;
103 final Symtab syms;
104 final Resolve rs;
105 final Operators operators;
106 final Infer infer;
107 final Analyzer analyzer;
108 final DeferredAttr deferredAttr;
109 final Check chk;
110 final Flow flow;
111 final MemberEnter memberEnter;
112 final TypeEnter typeEnter;
113 final TreeMaker make;
114 final ConstFold cfolder;
115 final Enter enter;
116 final Target target;
117 final Types types;
118 final Preview preview;
119 final JCDiagnostic.Factory diags;
120 final TypeAnnotations typeAnnotations;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127 final boolean captureMRefReturnType;
128
129 public static Attr instance(Context context) {
130 Attr instance = context.get(attrKey);
131 if (instance == null)
132 instance = new Attr(context);
133 return instance;
134 }
135
136 @SuppressWarnings("this-escape")
137 protected Attr(Context context) {
138 context.put(attrKey, this);
139
140 names = Names.instance(context);
141 log = Log.instance(context);
142 lintMapper = LintMapper.instance(context);
143 syms = Symtab.instance(context);
144 rs = Resolve.instance(context);
145 operators = Operators.instance(context);
146 chk = Check.instance(context);
147 flow = Flow.instance(context);
148 memberEnter = MemberEnter.instance(context);
149 typeEnter = TypeEnter.instance(context);
150 make = TreeMaker.instance(context);
151 enter = Enter.instance(context);
152 infer = Infer.instance(context);
153 analyzer = Analyzer.instance(context);
154 deferredAttr = DeferredAttr.instance(context);
155 cfolder = ConstFold.instance(context);
156 target = Target.instance(context);
157 types = Types.instance(context);
158 preview = Preview.instance(context);
159 diags = JCDiagnostic.Factory.instance(context);
160 annotate = Annotate.instance(context);
161 typeAnnotations = TypeAnnotations.instance(context);
162 typeEnvs = TypeEnvs.instance(context);
163 dependencies = Dependencies.instance(context);
164 argumentAttr = ArgumentAttr.instance(context);
165 matchBindingsComputer = MatchBindingsComputer.instance(context);
166 attrRecover = AttrRecover.instance(context);
167
168 Options options = Options.instance(context);
169
170 Source source = Source.instance(context);
171 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
172 allowRecords = Feature.RECORDS.allowedInSource(source);
173 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
174 Feature.PATTERN_SWITCH.allowedInSource(source);
175 allowUnconditionalPatternsInstanceOf =
176 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
177 sourceName = source.name;
178 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
179 captureMRefReturnType = Source.Feature.CAPTURE_MREF_RETURN_TYPE.allowedInSource(source);
180
181 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
182 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
183 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
184 methodAttrInfo = new MethodAttrInfo();
185 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
186 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
187 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
188 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
189 }
190
191 /** Switch: reifiable types in instanceof enabled?
192 */
193 boolean allowReifiableTypesInInstanceof;
194
195 /** Are records allowed
196 */
197 private final boolean allowRecords;
198
199 /** Are patterns in switch allowed
200 */
201 private final boolean allowPatternSwitch;
202
203 /** Are unconditional patterns in instanceof allowed
204 */
205 private final boolean allowUnconditionalPatternsInstanceOf;
206
207 /**
208 * Switch: warn about use of variable before declaration?
209 * RFE: 6425594
210 */
211 boolean useBeforeDeclarationWarning;
212
213 /**
214 * Switch: name of source level; used for error reporting.
215 */
216 String sourceName;
217
218 /** Check kind and type of given tree against protokind and prototype.
219 * If check succeeds, store type in tree and return it.
220 * If check fails, store errType in tree and return it.
221 * No checks are performed if the prototype is a method type.
222 * It is not necessary in this case since we know that kind and type
223 * are correct.
224 *
225 * @param tree The tree whose kind and type is checked
226 * @param found The computed type of the tree
227 * @param ownkind The computed kind of the tree
228 * @param resultInfo The expected result of the tree
229 */
230 Type check(final JCTree tree,
231 final Type found,
232 final KindSelector ownkind,
233 final ResultInfo resultInfo) {
234 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
235 Type owntype;
236 boolean shouldCheck = !found.hasTag(ERROR) &&
237 !resultInfo.pt.hasTag(METHOD) &&
238 !resultInfo.pt.hasTag(FORALL);
239 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
240 log.error(tree.pos(),
241 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
242 ownkind.kindNames()));
243 owntype = types.createErrorType(found);
244 } else if (inferenceContext.free(found)) {
245 //delay the check if there are inference variables in the found type
246 //this means we are dealing with a partially inferred poly expression
247 owntype = shouldCheck ? resultInfo.pt : found;
248 if (resultInfo.checkMode.installPostInferenceHook()) {
249 inferenceContext.addFreeTypeListener(List.of(found),
250 instantiatedContext -> {
251 ResultInfo pendingResult =
252 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
253 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
254 });
255 }
256 } else {
257 owntype = shouldCheck ?
258 resultInfo.check(tree, found) :
259 found;
260 }
261 if (resultInfo.checkMode.updateTreeType()) {
262 tree.type = owntype;
263 }
264 return owntype;
265 }
266
267 /** Is given blank final variable assignable, i.e. in a scope where it
268 * may be assigned to even though it is final?
269 * @param v The blank final variable.
270 * @param env The current environment.
271 */
272 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
273 Symbol owner = env.info.scope.owner;
274 // owner refers to the innermost variable, method or
275 // initializer block declaration at this point.
276 boolean isAssignable =
277 v.owner == owner
278 ||
279 ((owner.name == names.init || // i.e. we are in a constructor
280 owner.kind == VAR || // i.e. we are in a variable initializer
281 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
282 &&
283 v.owner == owner.owner
284 &&
285 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
286 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
287 return isAssignable & !insideCompactConstructor;
288 }
289
290 /** Check that variable can be assigned to.
291 * @param pos The current source code position.
292 * @param v The assigned variable
293 * @param base If the variable is referred to in a Select, the part
294 * to the left of the `.', null otherwise.
295 * @param env The current environment.
296 */
297 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
298 if (v.name == names._this) {
299 log.error(pos, Errors.CantAssignValToThis);
300 return;
301 }
302 if ((v.flags() & FINAL) != 0 &&
303 ((v.flags() & HASINIT) != 0
304 ||
305 !((base == null ||
306 TreeInfo.isThisQualifier(base)) &&
307 isAssignableAsBlankFinal(v, env)))) {
308 if (v.isResourceVariable()) { //TWR resource
309 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
310 } else {
311 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
312 }
313 return;
314 }
315
316 // Check instance field assignments that appear in constructor prologues
317 if (rs.isEarlyReference(env, base, v)) {
318
319 // Field may not be inherited from a superclass
320 if (v.owner != env.enclClass.sym) {
321 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
322 return;
323 }
324
325 // Field may not have an initializer
326 if ((v.flags() & HASINIT) != 0) {
327 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
328 return;
329 }
330 }
331 }
332
333 /** Does tree represent a static reference to an identifier?
334 * It is assumed that tree is either a SELECT or an IDENT.
335 * We have to weed out selects from non-type names here.
336 * @param tree The candidate tree.
337 */
338 boolean isStaticReference(JCTree tree) {
339 if (tree.hasTag(SELECT)) {
340 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
341 if (lsym == null || lsym.kind != TYP) {
342 return false;
343 }
344 }
345 return true;
346 }
347
348 /** Is this symbol a type?
349 */
350 static boolean isType(Symbol sym) {
351 return sym != null && sym.kind == TYP;
352 }
353
354 /** Attribute a parsed identifier.
355 * @param tree Parsed identifier name
356 * @param topLevel The toplevel to use
357 */
358 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
359 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
360 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
361 syms.errSymbol.name,
362 null, null, null, null);
363 localEnv.enclClass.sym = syms.errSymbol;
364 return attribIdent(tree, localEnv);
365 }
366
367 /** Attribute a parsed identifier.
368 * @param tree Parsed identifier name
369 * @param env The env to use
370 */
371 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
372 return tree.accept(identAttributer, env);
373 }
374 // where
375 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
376 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
377 @Override @DefinedBy(Api.COMPILER_TREE)
378 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
379 Symbol site = visit(node.getExpression(), env);
380 if (site == null || site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
381 return site;
382 Name name = (Name)node.getIdentifier();
383 if (site.kind == PCK) {
384 env.toplevel.packge = (PackageSymbol)site;
385 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
386 KindSelector.TYP_PCK);
387 } else {
388 env.enclClass.sym = (ClassSymbol)site;
389 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
390 }
391 }
392
393 @Override @DefinedBy(Api.COMPILER_TREE)
394 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
395 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
396 }
397 }
398
399 public Type coerce(Type etype, Type ttype) {
400 return cfolder.coerce(etype, ttype);
401 }
402
403 public Type attribType(JCTree node, TypeSymbol sym) {
404 Env<AttrContext> env = typeEnvs.get(sym);
405 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
406 return attribTree(node, localEnv, unknownTypeInfo);
407 }
408
409 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
410 // Attribute qualifying package or class.
411 JCFieldAccess s = tree.qualid;
412 return attribTree(s.selected, env,
413 new ResultInfo(tree.staticImport ?
414 KindSelector.TYP : KindSelector.TYP_PCK,
415 Type.noType));
416 }
417
418 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
419 return attribToTree(expr, env, tree, unknownExprInfo);
420 }
421
422 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
423 return attribToTree(stmt, env, tree, statInfo);
424 }
425
426 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
427 breakTree = tree;
428 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
429 try {
430 deferredAttr.attribSpeculative(root, env, resultInfo,
431 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
432 argumentAttr.withLocalCacheContext());
433 attrRecover.doRecovery();
434 } catch (BreakAttr b) {
435 return b.env;
436 } catch (AssertionError ae) {
437 if (ae.getCause() instanceof BreakAttr breakAttr) {
438 return breakAttr.env;
439 } else {
440 throw ae;
441 }
442 } finally {
443 breakTree = null;
444 log.useSource(prev);
445 }
446 return env;
447 }
448
449 private JCTree breakTree = null;
450
451 private static class BreakAttr extends RuntimeException {
452 static final long serialVersionUID = -6924771130405446405L;
453 private transient Env<AttrContext> env;
454 private BreakAttr(Env<AttrContext> env) {
455 this.env = env;
456 }
457 }
458
459 /**
460 * Mode controlling behavior of Attr.Check
461 */
462 enum CheckMode {
463
464 NORMAL,
465
466 /**
467 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
468 * that the captured var cache in {@code InferenceContext} will be used in read-only
469 * mode when performing inference checks.
470 */
471 NO_TREE_UPDATE {
472 @Override
473 public boolean updateTreeType() {
474 return false;
475 }
476 },
477 /**
478 * Mode signalling that caller will manage free types in tree decorations.
479 */
480 NO_INFERENCE_HOOK {
481 @Override
482 public boolean installPostInferenceHook() {
483 return false;
484 }
485 };
486
487 public boolean updateTreeType() {
488 return true;
489 }
490 public boolean installPostInferenceHook() {
491 return true;
492 }
493 }
494
495
496 class ResultInfo {
497 final KindSelector pkind;
498 final Type pt;
499 final CheckContext checkContext;
500 final CheckMode checkMode;
501
502 ResultInfo(KindSelector pkind, Type pt) {
503 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
504 }
505
506 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
507 this(pkind, pt, chk.basicHandler, checkMode);
508 }
509
510 protected ResultInfo(KindSelector pkind,
511 Type pt, CheckContext checkContext) {
512 this(pkind, pt, checkContext, CheckMode.NORMAL);
513 }
514
515 protected ResultInfo(KindSelector pkind,
516 Type pt, CheckContext checkContext, CheckMode checkMode) {
517 this.pkind = pkind;
518 this.pt = pt;
519 this.checkContext = checkContext;
520 this.checkMode = checkMode;
521 }
522
523 /**
524 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
525 * @param tree The tree to be type-checked.
526 * @return true if {@code ArgumentAttr} should be used.
527 */
528 protected boolean needsArgumentAttr(JCTree tree) { return false; }
529
530 protected Type check(final DiagnosticPosition pos, final Type found) {
531 return chk.checkType(pos, found, pt, checkContext);
532 }
533
534 protected ResultInfo dup(Type newPt) {
535 return new ResultInfo(pkind, newPt, checkContext, checkMode);
536 }
537
538 protected ResultInfo dup(CheckContext newContext) {
539 return new ResultInfo(pkind, pt, newContext, checkMode);
540 }
541
542 protected ResultInfo dup(Type newPt, CheckContext newContext) {
543 return new ResultInfo(pkind, newPt, newContext, checkMode);
544 }
545
546 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
547 return new ResultInfo(pkind, newPt, newContext, newMode);
548 }
549
550 protected ResultInfo dup(CheckMode newMode) {
551 return new ResultInfo(pkind, pt, checkContext, newMode);
552 }
553
554 @Override
555 public String toString() {
556 if (pt != null) {
557 return pt.toString();
558 } else {
559 return "";
560 }
561 }
562 }
563
564 class MethodAttrInfo extends ResultInfo {
565 public MethodAttrInfo() {
566 this(chk.basicHandler);
567 }
568
569 public MethodAttrInfo(CheckContext checkContext) {
570 super(KindSelector.VAL, Infer.anyPoly, checkContext);
571 }
572
573 @Override
574 protected boolean needsArgumentAttr(JCTree tree) {
575 return true;
576 }
577
578 protected ResultInfo dup(Type newPt) {
579 throw new IllegalStateException();
580 }
581
582 protected ResultInfo dup(CheckContext newContext) {
583 return new MethodAttrInfo(newContext);
584 }
585
586 protected ResultInfo dup(Type newPt, CheckContext newContext) {
587 throw new IllegalStateException();
588 }
589
590 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
591 throw new IllegalStateException();
592 }
593
594 protected ResultInfo dup(CheckMode newMode) {
595 throw new IllegalStateException();
596 }
597 }
598
599 class RecoveryInfo extends ResultInfo {
600
601 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
602 this(deferredAttrContext, Type.recoveryType);
603 }
604
605 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
606 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
607 @Override
608 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
609 return deferredAttrContext;
610 }
611 @Override
612 public boolean compatible(Type found, Type req, Warner warn) {
613 return true;
614 }
615 @Override
616 public void report(DiagnosticPosition pos, JCDiagnostic details) {
617 boolean needsReport = pt == Type.recoveryType ||
618 (details.getDiagnosticPosition() != null &&
619 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
620 if (needsReport) {
621 chk.basicHandler.report(pos, details);
622 }
623 }
624 });
625 }
626 }
627
628 final ResultInfo statInfo;
629 final ResultInfo varAssignmentInfo;
630 final ResultInfo methodAttrInfo;
631 final ResultInfo unknownExprInfo;
632 final ResultInfo unknownTypeInfo;
633 final ResultInfo unknownTypeExprInfo;
634 final ResultInfo recoveryInfo;
635 final MethodType initBlockType;
636
637 Type pt() {
638 return resultInfo.pt;
639 }
640
641 KindSelector pkind() {
642 return resultInfo.pkind;
643 }
644
645 /* ************************************************************************
646 * Visitor methods
647 *************************************************************************/
648
649 /** Visitor argument: the current environment.
650 */
651 Env<AttrContext> env;
652
653 /** Visitor argument: the currently expected attribution result.
654 */
655 ResultInfo resultInfo;
656
657 /** Visitor result: the computed type.
658 */
659 Type result;
660
661 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
662
663 /** Visitor method: attribute a tree, catching any completion failure
664 * exceptions. Return the tree's type.
665 *
666 * @param tree The tree to be visited.
667 * @param env The environment visitor argument.
668 * @param resultInfo The result info visitor argument.
669 */
670 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
671 Env<AttrContext> prevEnv = this.env;
672 ResultInfo prevResult = this.resultInfo;
673 try {
674 this.env = env;
675 this.resultInfo = resultInfo;
676 if (resultInfo.needsArgumentAttr(tree)) {
677 result = argumentAttr.attribArg(tree, env);
678 } else {
679 tree.accept(this);
680 }
681 matchBindings = matchBindingsComputer.finishBindings(tree,
682 matchBindings);
683 checkBreakTree(tree, env);
684 return result;
685 } catch (CompletionFailure ex) {
686 tree.type = syms.errType;
687 return chk.completionError(tree.pos(), ex);
688 } finally {
689 this.env = prevEnv;
690 this.resultInfo = prevResult;
691 }
692 }
693
694 private void checkBreakTree(JCTree tree, Env<AttrContext> env) {
695 if (tree == breakTree &&
696 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
697 breakTreeFound(copyEnv(env));
698 }
699 }
700
701 protected void breakTreeFound(Env<AttrContext> env) {
702 throw new BreakAttr(env);
703 }
704
705 Env<AttrContext> copyEnv(Env<AttrContext> env) {
706 Env<AttrContext> newEnv =
707 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
708 if (newEnv.outer != null) {
709 newEnv.outer = copyEnv(newEnv.outer);
710 }
711 return newEnv;
712 }
713
714 WriteableScope copyScope(WriteableScope sc) {
715 WriteableScope newScope = WriteableScope.create(sc.owner);
716 List<Symbol> elemsList = List.nil();
717 for (Symbol sym : sc.getSymbols()) {
718 elemsList = elemsList.prepend(sym);
719 }
720 for (Symbol s : elemsList) {
721 newScope.enter(s);
722 }
723 return newScope;
724 }
725
726 /** Derived visitor method: attribute an expression tree.
727 */
728 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
729 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
730 }
731
732 /** Derived visitor method: attribute an expression tree with
733 * no constraints on the computed type.
734 */
735 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
736 return attribTree(tree, env, unknownExprInfo);
737 }
738
739 /** Derived visitor method: attribute a type tree.
740 */
741 public Type attribType(JCTree tree, Env<AttrContext> env) {
742 Type result = attribType(tree, env, Type.noType);
743 return result;
744 }
745
746 /** Derived visitor method: attribute a type tree.
747 */
748 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
749 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
750 return result;
751 }
752
753 /** Derived visitor method: attribute a statement or definition tree.
754 */
755 public Type attribStat(JCTree tree, Env<AttrContext> env) {
756 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
757 Type result = attribTree(tree, env, statInfo);
758 analyzer.analyzeIfNeeded(tree, analyzeEnv);
759 attrRecover.doRecovery();
760 return result;
761 }
762
763 /** Attribute a list of expressions, returning a list of types.
764 */
765 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
766 ListBuffer<Type> ts = new ListBuffer<>();
767 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
768 ts.append(attribExpr(l.head, env, pt));
769 return ts.toList();
770 }
771
772 /** Attribute a list of statements, returning nothing.
773 */
774 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
775 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
776 attribStat(l.head, env);
777 }
778
779 /** Attribute the arguments in a method call, returning the method kind.
780 */
781 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
782 KindSelector kind = initialKind;
783 for (JCExpression arg : trees) {
784 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
785 if (argtype.hasTag(DEFERRED)) {
786 kind = KindSelector.of(KindSelector.POLY, kind);
787 }
788 argtypes.append(argtype);
789 }
790 return kind;
791 }
792
793 /** Attribute a type argument list, returning a list of types.
794 * Caller is responsible for calling checkRefTypes.
795 */
796 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
797 ListBuffer<Type> argtypes = new ListBuffer<>();
798 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
799 argtypes.append(attribType(l.head, env));
800 return argtypes.toList();
801 }
802
803 /** Attribute a type argument list, returning a list of types.
804 * Check that all the types are references.
805 */
806 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
807 List<Type> types = attribAnyTypes(trees, env);
808 return chk.checkRefTypes(trees, types);
809 }
810
811 /**
812 * Attribute type variables (of generic classes or methods).
813 * Compound types are attributed later in attribBounds.
814 * @param typarams the type variables to enter
815 * @param env the current environment
816 */
817 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
818 for (JCTypeParameter tvar : typarams) {
819 TypeVar a = (TypeVar)tvar.type;
820 a.tsym.flags_field |= UNATTRIBUTED;
821 a.setUpperBound(Type.noType);
822 if (!tvar.bounds.isEmpty()) {
823 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
824 for (JCExpression bound : tvar.bounds.tail)
825 bounds = bounds.prepend(attribType(bound, env));
826 types.setBounds(a, bounds.reverse());
827 } else {
828 // if no bounds are given, assume a single bound of
829 // java.lang.Object.
830 types.setBounds(a, List.of(syms.objectType));
831 }
832 a.tsym.flags_field &= ~UNATTRIBUTED;
833 }
834 if (checkCyclic) {
835 for (JCTypeParameter tvar : typarams) {
836 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
837 }
838 }
839 }
840
841 /**
842 * Attribute the type references in a list of annotations.
843 */
844 void attribAnnotationTypes(List<JCAnnotation> annotations,
845 Env<AttrContext> env) {
846 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
847 JCAnnotation a = al.head;
848 attribType(a.annotationType, env);
849 }
850 }
851
852 /**
853 * Attribute a "lazy constant value".
854 * @param env The env for the const value
855 * @param variable The initializer for the const value
856 * @param type The expected type, or null
857 * @see VarSymbol#setLazyConstValue
858 */
859 public Object attribLazyConstantValue(Env<AttrContext> env,
860 Env<AttrContext> enclosingEnv,
861 JCVariableDecl variable,
862 Type type) {
863 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
864 try {
865 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
866 Type itype = attribExpr(variable.init, env, type);
867 if (variable.isImplicitlyTyped()) {
868 //fixup local variable type
869 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
870 }
871 if (itype.constValue() != null) {
872 return coerce(itype, type).constValue();
873 } else {
874 return null;
875 }
876 } finally {
877 log.useSource(prevSource);
878 }
879 }
880
881 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
882 * Supertypes of anonymous inner classes are usually already attributed.
883 *
884 * @param tree The tree making up the type reference.
885 * @param env The environment current at the reference.
886 * @param classExpected true if only a class is expected here.
887 * @param interfaceExpected true if only an interface is expected here.
888 */
889 Type attribBase(JCTree tree,
890 Env<AttrContext> env,
891 boolean classExpected,
892 boolean interfaceExpected,
893 boolean checkExtensible) {
894 Type t = tree.type != null ?
895 tree.type :
896 attribType(tree, env);
897 try {
898 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
899 } catch (CompletionFailure ex) {
900 chk.completionError(tree.pos(), ex);
901 return t;
902 }
903 }
904 Type checkBase(Type t,
905 JCTree tree,
906 Env<AttrContext> env,
907 boolean classExpected,
908 boolean interfaceExpected,
909 boolean checkExtensible) {
910 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
911 (((JCTypeApply) tree).clazz).pos() : tree.pos();
912 if (t.tsym.isAnonymous()) {
913 log.error(pos, Errors.CantInheritFromAnon);
914 return types.createErrorType(t);
915 }
916 if (t.isErroneous())
917 return t;
918 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
919 // check that type variable is already visible
920 if (t.getUpperBound() == null) {
921 log.error(pos, Errors.IllegalForwardRef);
922 return types.createErrorType(t);
923 }
924 } else {
925 t = chk.checkClassType(pos, t, checkExtensible);
926 }
927 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
928 log.error(pos, Errors.IntfExpectedHere);
929 // return errType is necessary since otherwise there might
930 // be undetected cycles which cause attribution to loop
931 return types.createErrorType(t);
932 } else if (checkExtensible &&
933 classExpected &&
934 (t.tsym.flags() & INTERFACE) != 0) {
935 log.error(pos, Errors.NoIntfExpectedHere);
936 return types.createErrorType(t);
937 }
938 if (checkExtensible &&
939 ((t.tsym.flags() & FINAL) != 0)) {
940 log.error(pos,
941 Errors.CantInheritFromFinal(t.tsym));
942 }
943 chk.checkNonCyclic(pos, t);
944 return t;
945 }
946
947 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
948 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
949 id.type = env.info.scope.owner.enclClass().type;
950 id.sym = env.info.scope.owner.enclClass();
951 return id.type;
952 }
953
954 public void visitClassDef(JCClassDecl tree) {
955 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
956 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
957 argumentAttr.withLocalCacheContext() : null);
958 boolean ctorProloguePrev = env.info.ctorPrologue;
959 try {
960 // Local and anonymous classes have not been entered yet, so we need to
961 // do it now.
962 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
963 enter.classEnter(tree, env);
964 } else {
965 // If this class declaration is part of a class level annotation,
966 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
967 // order to simplify later steps and allow for sensible error
968 // messages.
969 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
970 enter.classEnter(tree, env);
971 }
972
973 ClassSymbol c = tree.sym;
974 if (c == null) {
975 // exit in case something drastic went wrong during enter.
976 result = null;
977 } else {
978 // make sure class has been completed:
979 c.complete();
980
981 // If a class declaration appears in a constructor prologue,
982 // that means it's either a local class or an anonymous class.
983 // Either way, there is no immediately enclosing instance.
984 if (ctorProloguePrev) {
985 c.flags_field |= NOOUTERTHIS;
986 }
987 attribClass(tree.pos(), c);
988 result = tree.type = c.type;
989 }
990 } finally {
991 localCacheContext.ifPresent(LocalCacheContext::leave);
992 env.info.ctorPrologue = ctorProloguePrev;
993 }
994 }
995
996 public void visitMethodDef(JCMethodDecl tree) {
997 MethodSymbol m = tree.sym;
998 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
999
1000 Lint lint = env.info.lint.augment(m);
1001 Lint prevLint = chk.setLint(lint);
1002 boolean ctorProloguePrev = env.info.ctorPrologue;
1003 Assert.check(!env.info.ctorPrologue);
1004 MethodSymbol prevMethod = chk.setMethod(m);
1005 try {
1006 chk.checkDeprecatedAnnotation(tree.pos(), m);
1007
1008
1009 // Create a new environment with local scope
1010 // for attributing the method.
1011 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1012 localEnv.info.lint = lint;
1013
1014 attribStats(tree.typarams, localEnv);
1015
1016 // If we override any other methods, check that we do so properly.
1017 // JLS ???
1018 if (m.isStatic()) {
1019 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1020 } else {
1021 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1022 }
1023 chk.checkOverride(env, tree, m);
1024
1025 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1026 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1027 }
1028
1029 // Enter all type parameters into the local method scope.
1030 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1031 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1032
1033 ClassSymbol owner = env.enclClass.sym;
1034 if ((owner.flags() & ANNOTATION) != 0 &&
1035 (tree.params.nonEmpty() ||
1036 tree.recvparam != null))
1037 log.error(tree.params.nonEmpty() ?
1038 tree.params.head.pos() :
1039 tree.recvparam.pos(),
1040 Errors.IntfAnnotationMembersCantHaveParams);
1041
1042 // Attribute all value parameters.
1043 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1044 attribStat(l.head, localEnv);
1045 }
1046
1047 chk.checkVarargsMethodDecl(localEnv, tree);
1048
1049 // Check that type parameters are well-formed.
1050 chk.validate(tree.typarams, localEnv);
1051
1052 // Check that result type is well-formed.
1053 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) {
1054 chk.validate(tree.restype, localEnv);
1055 }
1056 chk.checkRequiresIdentity(tree, env.info.lint);
1057
1058 // Check that receiver type is well-formed.
1059 if (tree.recvparam != null) {
1060 // Use a new environment to check the receiver parameter.
1061 // Otherwise I get "might not have been initialized" errors.
1062 // Is there a better way?
1063 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1064 attribType(tree.recvparam, newEnv);
1065 chk.validate(tree.recvparam, newEnv);
1066 }
1067
1068 // Is this method a constructor?
1069 boolean isConstructor = TreeInfo.isConstructor(tree);
1070
1071 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1072 // lets find if this method is an accessor
1073 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1074 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1075 if (recordComponent.isPresent()) {
1076 // the method is a user defined accessor lets check that everything is fine
1077 if (!tree.sym.isPublic()) {
1078 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1079 }
1080 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1081 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1082 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1083 }
1084 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1085 log.error(tree,
1086 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1087 }
1088 if (!tree.typarams.isEmpty()) {
1089 log.error(tree,
1090 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1091 }
1092 if (tree.sym.isStatic()) {
1093 log.error(tree,
1094 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1095 }
1096 }
1097
1098 if (isConstructor) {
1099 // if this a constructor other than the canonical one
1100 if ((tree.sym.flags_field & RECORD) == 0) {
1101 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1102 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1103 }
1104 } else {
1105 // but if it is the canonical:
1106
1107 /* if user generated, then it shouldn't:
1108 * - have an accessibility stricter than that of the record type
1109 * - explicitly invoke any other constructor
1110 */
1111 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1112 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1113 log.error(tree,
1114 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1115 Errors.InvalidCanonicalConstructorInRecord(
1116 Fragments.Canonical,
1117 env.enclClass.sym.name,
1118 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1119 ) :
1120 Errors.InvalidCanonicalConstructorInRecord(
1121 Fragments.Canonical,
1122 env.enclClass.sym.name,
1123 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1124 )
1125 );
1126 }
1127
1128 if (TreeInfo.hasAnyConstructorCall(tree)) {
1129 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1130 Fragments.Canonical, env.enclClass.sym.name,
1131 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1132 }
1133 }
1134
1135 // also we want to check that no type variables have been defined
1136 if (!tree.typarams.isEmpty()) {
1137 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1138 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1139 }
1140
1141 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1142 * record components
1143 */
1144 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1145 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1146 for (JCVariableDecl param: tree.params) {
1147 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1148 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1149 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1150 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1151 Fragments.Canonical, env.enclClass.sym.name,
1152 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1153 }
1154 recordComponents = recordComponents.tail;
1155 recordFieldTypes = recordFieldTypes.tail;
1156 }
1157 }
1158 }
1159 }
1160
1161 // annotation method checks
1162 if ((owner.flags() & ANNOTATION) != 0) {
1163 // annotation method cannot have throws clause
1164 if (tree.thrown.nonEmpty()) {
1165 log.error(tree.thrown.head.pos(),
1166 Errors.ThrowsNotAllowedInIntfAnnotation);
1167 }
1168 // annotation method cannot declare type-parameters
1169 if (tree.typarams.nonEmpty()) {
1170 log.error(tree.typarams.head.pos(),
1171 Errors.IntfAnnotationMembersCantHaveTypeParams);
1172 }
1173 // validate annotation method's return type (could be an annotation type)
1174 chk.validateAnnotationType(tree.restype);
1175 // ensure that annotation method does not clash with members of Object/Annotation
1176 chk.validateAnnotationMethod(tree.pos(), m);
1177 }
1178
1179 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1180 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1181
1182 if (tree.body == null) {
1183 // Empty bodies are only allowed for
1184 // abstract, native, or interface methods, or for methods
1185 // in a retrofit signature class.
1186 if (tree.defaultValue != null) {
1187 if ((owner.flags() & ANNOTATION) == 0)
1188 log.error(tree.pos(),
1189 Errors.DefaultAllowedInIntfAnnotationMember);
1190 }
1191 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1192 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract(tree.sym, owner));
1193 } else {
1194 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1195 if ((owner.flags() & INTERFACE) != 0) {
1196 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1197 } else {
1198 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1199 }
1200 } else if ((tree.mods.flags & NATIVE) != 0) {
1201 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1202 }
1203 // Add an implicit super() call unless an explicit call to
1204 // super(...) or this(...) is given
1205 // or we are compiling class java.lang.Object.
1206 if (isConstructor && owner.type != syms.objectType) {
1207 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1208 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1209 make.Ident(names._super), make.Idents(List.nil())));
1210 tree.body.stats = tree.body.stats.prepend(supCall);
1211 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1212 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1213 TreeInfo.hasConstructorCall(tree, names._super)) {
1214 // enum constructors are not allowed to call super
1215 // directly, so make sure there aren't any super calls
1216 // in enum constructors, except in the compiler
1217 // generated one.
1218 log.error(tree.body.stats.head.pos(),
1219 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1220 }
1221 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1222 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1223 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1224 if (!initParamNames.equals(recordComponentNames)) {
1225 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1226 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1227 }
1228 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1229 log.error(tree,
1230 Errors.InvalidCanonicalConstructorInRecord(
1231 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1232 env.enclClass.sym.name,
1233 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1234 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1235 }
1236 }
1237 }
1238
1239 // Attribute all type annotations in the body
1240 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1241 annotate.flush();
1242
1243 // Start of constructor prologue (if not in java.lang.Object constructor)
1244 localEnv.info.ctorPrologue = isConstructor && owner.type != syms.objectType;
1245
1246 // Attribute method body.
1247 attribStat(tree.body, localEnv);
1248 }
1249
1250 localEnv.info.scope.leave();
1251 result = tree.type = m.type;
1252 } finally {
1253 chk.setLint(prevLint);
1254 chk.setMethod(prevMethod);
1255 env.info.ctorPrologue = ctorProloguePrev;
1256 }
1257 }
1258
1259 public void visitVarDef(JCVariableDecl tree) {
1260 // Local variables have not been entered yet, so we need to do it now:
1261 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1262 if (tree.sym != null) {
1263 // parameters have already been entered
1264 env.info.scope.enter(tree.sym);
1265 } else {
1266 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0 && tree.type == null) {
1267 if (tree.init == null) {
1268 //cannot use 'var' without initializer
1269 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1270 tree.type = syms.errType;
1271 } else {
1272 Fragment msg = canInferLocalVarType(tree);
1273 if (msg != null) {
1274 //cannot use 'var' with initializer which require an explicit target
1275 //(e.g. lambda, method reference, array initializer).
1276 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1277 tree.type = syms.errType;
1278 }
1279 }
1280 }
1281 try {
1282 annotate.blockAnnotations();
1283 memberEnter.memberEnter(tree, env);
1284 typeAnnotations.organizeTypeAnnotationsSignaturesForLocalVarType(env, tree);
1285 } finally {
1286 annotate.unblockAnnotations();
1287 }
1288 }
1289 } else {
1290 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1291 }
1292
1293 VarSymbol v = tree.sym;
1294 Lint lint = env.info.lint.augment(v);
1295 Lint prevLint = chk.setLint(lint);
1296
1297 // Check that the variable's declared type is well-formed.
1298 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1299 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1300 (tree.sym.flags() & PARAMETER) != 0;
1301 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1302
1303 try {
1304 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1305 chk.checkDeprecatedAnnotation(tree.pos(), v);
1306
1307 if (tree.init != null) {
1308 if ((v.flags_field & FINAL) == 0 ||
1309 !memberEnter.needsLazyConstValue(tree.init)) {
1310 // Not a compile-time constant
1311 // Attribute initializer in a new environment
1312 // with the declared variable as owner.
1313 // Check that initializer conforms to variable's declared type.
1314 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1315 initEnv.info.lint = lint;
1316 // In order to catch self-references, we set the variable's
1317 // declaration position to maximal possible value, effectively
1318 // marking the variable as undefined.
1319 initEnv.info.enclVar = v;
1320 attribExpr(tree.init, initEnv, v.type);
1321 if (tree.isImplicitlyTyped()) {
1322 //fixup local variable type
1323 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1324 }
1325 }
1326 if (tree.isImplicitlyTyped()) {
1327 setupImplicitlyTypedVariable(tree, v.type);
1328 }
1329 }
1330 result = tree.type = v.type;
1331 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1332 if (isNonArgsMethodInObject(v.name)) {
1333 log.error(tree, Errors.IllegalRecordComponentName(v));
1334 }
1335 }
1336 chk.checkRequiresIdentity(tree, env.info.lint);
1337 }
1338 finally {
1339 chk.setLint(prevLint);
1340 }
1341 }
1342
1343 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1344 if (tree.init != null &&
1345 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1346 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1347 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1348 // Field initializer expression need to be entered.
1349 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym);
1350 annotate.flush();
1351 }
1352 }
1353
1354 private boolean isNonArgsMethodInObject(Name name) {
1355 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1356 if (s.type.getParameterTypes().isEmpty()) {
1357 return true;
1358 }
1359 }
1360 return false;
1361 }
1362
1363 Fragment canInferLocalVarType(JCVariableDecl tree) {
1364 LocalInitScanner lis = new LocalInitScanner();
1365 lis.scan(tree.init);
1366 return lis.badInferenceMsg;
1367 }
1368
1369 static class LocalInitScanner extends TreeScanner {
1370 Fragment badInferenceMsg = null;
1371 boolean needsTarget = true;
1372
1373 @Override
1374 public void visitNewArray(JCNewArray tree) {
1375 if (tree.elemtype == null && needsTarget) {
1376 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1377 }
1378 }
1379
1380 @Override
1381 public void visitLambda(JCLambda tree) {
1382 if (needsTarget) {
1383 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1384 }
1385 }
1386
1387 @Override
1388 public void visitTypeCast(JCTypeCast tree) {
1389 boolean prevNeedsTarget = needsTarget;
1390 try {
1391 needsTarget = false;
1392 super.visitTypeCast(tree);
1393 } finally {
1394 needsTarget = prevNeedsTarget;
1395 }
1396 }
1397
1398 @Override
1399 public void visitReference(JCMemberReference tree) {
1400 if (needsTarget) {
1401 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1402 }
1403 }
1404
1405 @Override
1406 public void visitNewClass(JCNewClass tree) {
1407 boolean prevNeedsTarget = needsTarget;
1408 try {
1409 needsTarget = false;
1410 super.visitNewClass(tree);
1411 } finally {
1412 needsTarget = prevNeedsTarget;
1413 }
1414 }
1415
1416 @Override
1417 public void visitApply(JCMethodInvocation tree) {
1418 boolean prevNeedsTarget = needsTarget;
1419 try {
1420 needsTarget = false;
1421 super.visitApply(tree);
1422 } finally {
1423 needsTarget = prevNeedsTarget;
1424 }
1425 }
1426 }
1427
1428 public void visitSkip(JCSkip tree) {
1429 result = null;
1430 }
1431
1432 public void visitBlock(JCBlock tree) {
1433 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1434 // Block is a static or instance initializer;
1435 // let the owner of the environment be a freshly
1436 // created BLOCK-method.
1437 Symbol fakeOwner =
1438 new MethodSymbol(tree.flags | BLOCK |
1439 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1440 env.info.scope.owner);
1441 final Env<AttrContext> localEnv =
1442 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1443
1444 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1445 // Attribute all type annotations in the block
1446 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1447 annotate.flush();
1448 attribStats(tree.stats, localEnv);
1449
1450 {
1451 // Store init and clinit type annotations with the ClassSymbol
1452 // to allow output in Gen.normalizeDefs.
1453 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1454 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1455 if ((tree.flags & STATIC) != 0) {
1456 cs.appendClassInitTypeAttributes(tas);
1457 } else {
1458 cs.appendInitTypeAttributes(tas);
1459 }
1460 }
1461 } else {
1462 // Create a new local environment with a local scope.
1463 Env<AttrContext> localEnv =
1464 env.dup(tree, env.info.dup(env.info.scope.dup()));
1465 try {
1466 attribStats(tree.stats, localEnv);
1467 } finally {
1468 localEnv.info.scope.leave();
1469 }
1470 }
1471 result = null;
1472 }
1473
1474 public void visitDoLoop(JCDoWhileLoop tree) {
1475 attribStat(tree.body, env.dup(tree));
1476 attribExpr(tree.cond, env, syms.booleanType);
1477 handleLoopConditionBindings(matchBindings, tree, tree.body);
1478 result = null;
1479 }
1480
1481 public void visitWhileLoop(JCWhileLoop tree) {
1482 attribExpr(tree.cond, env, syms.booleanType);
1483 MatchBindings condBindings = matchBindings;
1484 // include condition's bindings when true in the body:
1485 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1486 try {
1487 attribStat(tree.body, whileEnv.dup(tree));
1488 } finally {
1489 whileEnv.info.scope.leave();
1490 }
1491 handleLoopConditionBindings(condBindings, tree, tree.body);
1492 result = null;
1493 }
1494
1495 public void visitForLoop(JCForLoop tree) {
1496 Env<AttrContext> loopEnv =
1497 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1498 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1499 try {
1500 attribStats(tree.init, loopEnv);
1501 if (tree.cond != null) {
1502 attribExpr(tree.cond, loopEnv, syms.booleanType);
1503 // include condition's bindings when true in the body and step:
1504 condBindings = matchBindings;
1505 }
1506 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1507 try {
1508 bodyEnv.tree = tree; // before, we were not in loop!
1509 attribStats(tree.step, bodyEnv);
1510 attribStat(tree.body, bodyEnv);
1511 } finally {
1512 bodyEnv.info.scope.leave();
1513 }
1514 result = null;
1515 }
1516 finally {
1517 loopEnv.info.scope.leave();
1518 }
1519 handleLoopConditionBindings(condBindings, tree, tree.body);
1520 }
1521
1522 /**
1523 * Include condition's bindings when false after the loop, if cannot get out of the loop
1524 */
1525 private void handleLoopConditionBindings(MatchBindings condBindings,
1526 JCStatement loop,
1527 JCStatement loopBody) {
1528 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1529 !breaksTo(env, loop, loopBody)) {
1530 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1531 }
1532 }
1533
1534 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1535 preFlow(body);
1536 return flow.breaksToTree(env, loop, body, make);
1537 }
1538
1539 /**
1540 * Add given bindings to the current scope, unless there's a break to
1541 * an immediately enclosing labeled statement.
1542 */
1543 private void addBindings2Scope(JCStatement introducingStatement,
1544 List<BindingSymbol> bindings) {
1545 if (bindings.isEmpty()) {
1546 return ;
1547 }
1548
1549 var searchEnv = env;
1550 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1551 labeled.body == introducingStatement) {
1552 if (breaksTo(env, labeled, labeled.body)) {
1553 //breaking to an immediately enclosing labeled statement
1554 return ;
1555 }
1556 searchEnv = searchEnv.next;
1557 introducingStatement = labeled;
1558 }
1559
1560 //include condition's body when false after the while, if cannot get out of the loop
1561 bindings.forEach(env.info.scope::enter);
1562 bindings.forEach(BindingSymbol::preserveBinding);
1563 }
1564
1565 public void visitForeachLoop(JCEnhancedForLoop tree) {
1566 Env<AttrContext> loopEnv =
1567 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1568 try {
1569 //the Formal Parameter of a for-each loop is not in the scope when
1570 //attributing the for-each expression; we mimic this by attributing
1571 //the for-each expression first (against original scope).
1572 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1573 chk.checkNonVoid(tree.pos(), exprType);
1574 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1575 if (elemtype == null) {
1576 // or perhaps expr implements Iterable<T>?
1577 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1578 if (base == null) {
1579 log.error(tree.expr.pos(),
1580 Errors.ForeachNotApplicableToType(exprType,
1581 Fragments.TypeReqArrayOrIterable));
1582 elemtype = types.createErrorType(exprType);
1583 } else {
1584 List<Type> iterableParams = base.allparams();
1585 elemtype = iterableParams.isEmpty()
1586 ? syms.objectType
1587 : types.wildUpperBound(iterableParams.head);
1588
1589 // Check the return type of the method iterator().
1590 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1591 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1592 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1593 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1594 log.error(tree.pos(),
1595 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1596 }
1597 }
1598 }
1599 if (tree.var.isImplicitlyTyped()) {
1600 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1601 tree.var.type = inferredType;
1602 setupImplicitlyTypedVariable(tree.var, inferredType);
1603 }
1604 attribStat(tree.var, loopEnv);
1605 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1606 loopEnv.tree = tree; // before, we were not in loop!
1607 attribStat(tree.body, loopEnv);
1608 result = null;
1609 }
1610 finally {
1611 loopEnv.info.scope.leave();
1612 }
1613 }
1614
1615 public void visitLabelled(JCLabeledStatement tree) {
1616 // Check that label is not used in an enclosing statement
1617 Env<AttrContext> env1 = env;
1618 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1619 if (env1.tree.hasTag(LABELLED) &&
1620 ((JCLabeledStatement) env1.tree).label == tree.label) {
1621 log.error(tree.pos(),
1622 Errors.LabelAlreadyInUse(tree.label));
1623 break;
1624 }
1625 env1 = env1.next;
1626 }
1627
1628 attribStat(tree.body, env.dup(tree));
1629 result = null;
1630 }
1631
1632 public void visitSwitch(JCSwitch tree) {
1633 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1634 attribStats(c.stats, caseEnv);
1635 });
1636 result = null;
1637 }
1638
1639 public void visitSwitchExpression(JCSwitchExpression tree) {
1640 boolean wrongContext = false;
1641
1642 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1643 PolyKind.STANDALONE : PolyKind.POLY;
1644
1645 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1646 //this means we are returning a poly conditional from void-compatible lambda expression
1647 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1648 resultInfo = recoveryInfo;
1649 wrongContext = true;
1650 }
1651
1652 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1653 unknownExprInfo :
1654 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1655
1656 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1657 ListBuffer<Type> caseTypes = new ListBuffer<>();
1658
1659 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1660 caseEnv.info.yieldResult = condInfo;
1661 attribStats(c.stats, caseEnv);
1662 new TreeScanner() {
1663 @Override
1664 public void visitYield(JCYield brk) {
1665 if (brk.target == tree) {
1666 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1667 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1668 }
1669 super.visitYield(brk);
1670 }
1671
1672 @Override public void visitClassDef(JCClassDecl tree) {}
1673 @Override public void visitLambda(JCLambda tree) {}
1674 }.scan(c.stats);
1675 });
1676
1677 if (tree.cases.isEmpty()) {
1678 log.error(tree.pos(),
1679 Errors.SwitchExpressionEmpty);
1680 } else if (caseTypes.isEmpty()) {
1681 log.error(tree.pos(),
1682 Errors.SwitchExpressionNoResultExpressions);
1683 }
1684
1685 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1686
1687 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1688 }
1689 //where:
1690 CheckContext switchExpressionContext(CheckContext checkContext) {
1691 return new Check.NestedCheckContext(checkContext) {
1692 //this will use enclosing check context to check compatibility of
1693 //subexpression against target type; if we are in a method check context,
1694 //depending on whether boxing is allowed, we could have incompatibilities
1695 @Override
1696 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1697 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1698 }
1699 };
1700 }
1701
1702 private void handleSwitch(JCTree switchTree,
1703 JCExpression selector,
1704 List<JCCase> cases,
1705 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1706 Type seltype = attribExpr(selector, env);
1707 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
1708
1709 Env<AttrContext> switchEnv =
1710 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1711
1712 try {
1713 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1714 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1715 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
1716 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1717 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1718 boolean patternSwitch;
1719 if (seltype.isPrimitive() && !intSwitch) {
1720 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1721 patternSwitch = true;
1722 }
1723 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1724 !intSwitch) {
1725 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1726 patternSwitch = true;
1727 } else {
1728 patternSwitch = cases.stream()
1729 .flatMap(c -> c.labels.stream())
1730 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1731 TreeInfo.isNullCaseLabel(l));
1732 }
1733
1734 // Attribute all cases and
1735 // check that there are no duplicate case labels or default clauses.
1736 Set<Object> constants = new HashSet<>(); // The set of case constants.
1737 boolean hasDefault = false; // Is there a default label?
1738 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1739 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1740 boolean hasNullPattern = false; // Is there a null pattern?
1741 CaseTree.CaseKind caseKind = null;
1742 boolean wasError = false;
1743 JCCaseLabel unconditionalCaseLabel = null;
1744 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1745 JCCase c = l.head;
1746 if (caseKind == null) {
1747 caseKind = c.caseKind;
1748 } else if (caseKind != c.caseKind && !wasError) {
1749 log.error(c.pos(),
1750 Errors.SwitchMixingCaseTypes);
1751 wasError = true;
1752 }
1753 MatchBindings currentBindings = null;
1754 MatchBindings guardBindings = null;
1755 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1756 JCCaseLabel label = labels.head;
1757 if (label instanceof JCConstantCaseLabel constLabel) {
1758 JCExpression expr = constLabel.expr;
1759 if (TreeInfo.isNull(expr)) {
1760 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1761 if (hasNullPattern) {
1762 log.error(label.pos(), Errors.DuplicateCaseLabel);
1763 }
1764 hasNullPattern = true;
1765 attribExpr(expr, switchEnv, seltype);
1766 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1767 } else if (enumSwitch) {
1768 Symbol sym = enumConstant(expr, seltype);
1769 if (sym == null) {
1770 if (allowPatternSwitch) {
1771 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1772 Symbol enumSym = TreeInfo.symbol(expr);
1773 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1774 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1775 } else if (!constants.add(enumSym)) {
1776 log.error(label.pos(), Errors.DuplicateCaseLabel);
1777 }
1778 } else {
1779 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1780 }
1781 } else if (!constants.add(sym)) {
1782 log.error(label.pos(), Errors.DuplicateCaseLabel);
1783 }
1784 } else if (errorEnumSwitch) {
1785 //error recovery: the selector is erroneous, and all the case labels
1786 //are identifiers. This could be an enum switch - don't report resolve
1787 //error for the case label:
1788 var prevResolveHelper = rs.basicLogResolveHelper;
1789 try {
1790 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1791 attribExpr(expr, switchEnv, seltype);
1792 } finally {
1793 rs.basicLogResolveHelper = prevResolveHelper;
1794 }
1795 } else {
1796 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1797 if (!pattype.hasTag(ERROR)) {
1798 if (pattype.constValue() == null) {
1799 Symbol s = TreeInfo.symbol(expr);
1800 if (s != null && s.kind == TYP) {
1801 log.error(expr.pos(),
1802 Errors.PatternExpected);
1803 } else if (s == null || !s.isEnum()) {
1804 log.error(expr.pos(),
1805 (stringSwitch ? Errors.StringConstReq
1806 : intSwitch ? Errors.ConstExprReq
1807 : Errors.PatternOrEnumReq));
1808 } else if (!constants.add(s)) {
1809 log.error(label.pos(), Errors.DuplicateCaseLabel);
1810 }
1811 }
1812 else {
1813 boolean isLongFloatDoubleOrBooleanConstant =
1814 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
1815 if (isLongFloatDoubleOrBooleanConstant) {
1816 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
1817 }
1818 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
1819 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1820 } else if (!constants.add(pattype.constValue())) {
1821 log.error(c.pos(), Errors.DuplicateCaseLabel);
1822 }
1823 }
1824 }
1825 }
1826 } else if (label instanceof JCDefaultCaseLabel def) {
1827 if (hasDefault) {
1828 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1829 } else if (hasUnconditionalPattern) {
1830 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1831 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1832 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1833 }
1834 hasDefault = true;
1835 matchBindings = MatchBindingsComputer.EMPTY;
1836 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1837 //pattern
1838 JCPattern pat = patternlabel.pat;
1839 attribExpr(pat, switchEnv, seltype);
1840 Type primaryType = TreeInfo.primaryPatternType(pat);
1841
1842 if (primaryType.isPrimitive()) {
1843 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1844 } else if (!primaryType.hasTag(TYPEVAR)) {
1845 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1846 }
1847 checkCastablePattern(pat.pos(), seltype, primaryType);
1848 Type patternType = types.erasure(primaryType);
1849 JCExpression guard = c.guard;
1850 if (guardBindings == null && guard != null) {
1851 MatchBindings afterPattern = matchBindings;
1852 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1853 try {
1854 attribExpr(guard, bodyEnv, syms.booleanType);
1855 } finally {
1856 bodyEnv.info.scope.leave();
1857 }
1858
1859 guardBindings = matchBindings;
1860 matchBindings = afterPattern;
1861
1862 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1863 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1864 }
1865 }
1866 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1867 boolean unconditional =
1868 unguarded &&
1869 !patternType.isErroneous() &&
1870 types.isUnconditionallyExactTypeBased(seltype, patternType);
1871 if (unconditional) {
1872 if (hasUnconditionalPattern) {
1873 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1874 } else if (hasDefault) {
1875 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1876 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1877 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1878 }
1879 hasUnconditionalPattern = true;
1880 unconditionalCaseLabel = label;
1881 }
1882 lastPatternErroneous = patternType.isErroneous();
1883 } else {
1884 Assert.error();
1885 }
1886 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1887 }
1888
1889 if (guardBindings != null) {
1890 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1891 }
1892
1893 Env<AttrContext> caseEnv =
1894 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1895 try {
1896 attribCase.accept(c, caseEnv);
1897 } finally {
1898 caseEnv.info.scope.leave();
1899 }
1900 addVars(c.stats, switchEnv.info.scope);
1901
1902 preFlow(c);
1903 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1904 }
1905 if (patternSwitch) {
1906 chk.checkSwitchCaseStructure(cases);
1907 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1908 }
1909 if (switchTree.hasTag(SWITCH)) {
1910 ((JCSwitch) switchTree).hasUnconditionalPattern =
1911 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1912 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1913 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1914 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1915 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1916 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1917 } else {
1918 Assert.error(switchTree.getTag().name());
1919 }
1920 } finally {
1921 switchEnv.info.scope.leave();
1922 }
1923 }
1924 // where
1925 private ResultInfo caseLabelResultInfo(Type seltype) {
1926 return new ResultInfo(KindSelector.VAL_TYP,
1927 !seltype.hasTag(ERROR) ? seltype
1928 : Type.noType);
1929 }
1930 /** Add any variables defined in stats to the switch scope. */
1931 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1932 for (;stats.nonEmpty(); stats = stats.tail) {
1933 JCTree stat = stats.head;
1934 if (stat.hasTag(VARDEF))
1935 switchScope.enter(((JCVariableDecl) stat).sym);
1936 }
1937 }
1938 // where
1939 /** Return the selected enumeration constant symbol, or null. */
1940 private Symbol enumConstant(JCTree tree, Type enumType) {
1941 if (tree.hasTag(IDENT)) {
1942 JCIdent ident = (JCIdent)tree;
1943 Name name = ident.name;
1944 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1945 if (sym.kind == VAR) {
1946 Symbol s = ident.sym = sym;
1947 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1948 ident.type = s.type;
1949 return ((s.flags_field & Flags.ENUM) == 0)
1950 ? null : s;
1951 }
1952 }
1953 }
1954 return null;
1955 }
1956
1957 public void visitSynchronized(JCSynchronized tree) {
1958 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1959 if (tree.lock.type != null && tree.lock.type.isValueBased()) {
1960 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1961 }
1962 attribStat(tree.body, env);
1963 result = null;
1964 }
1965
1966 public void visitTry(JCTry tree) {
1967 // Create a new local environment with a local
1968 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1969 try {
1970 boolean isTryWithResource = tree.resources.nonEmpty();
1971 // Create a nested environment for attributing the try block if needed
1972 Env<AttrContext> tryEnv = isTryWithResource ?
1973 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1974 localEnv;
1975 try {
1976 // Attribute resource declarations
1977 for (JCTree resource : tree.resources) {
1978 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1979 @Override
1980 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1981 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1982 }
1983 };
1984 ResultInfo twrResult =
1985 new ResultInfo(KindSelector.VAR,
1986 syms.autoCloseableType,
1987 twrContext);
1988 if (resource.hasTag(VARDEF)) {
1989 attribStat(resource, tryEnv);
1990 twrResult.check(resource, resource.type);
1991
1992 //check that resource type cannot throw InterruptedException
1993 checkAutoCloseable(localEnv, resource, true);
1994
1995 VarSymbol var = ((JCVariableDecl) resource).sym;
1996
1997 var.flags_field |= Flags.FINAL;
1998 var.setData(ElementKind.RESOURCE_VARIABLE);
1999 } else {
2000 attribTree(resource, tryEnv, twrResult);
2001 }
2002 }
2003 // Attribute body
2004 attribStat(tree.body, tryEnv);
2005 } finally {
2006 if (isTryWithResource)
2007 tryEnv.info.scope.leave();
2008 }
2009
2010 // Attribute catch clauses
2011 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2012 JCCatch c = l.head;
2013 Env<AttrContext> catchEnv =
2014 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2015 try {
2016 Type ctype = attribStat(c.param, catchEnv);
2017 if (TreeInfo.isMultiCatch(c)) {
2018 //multi-catch parameter is implicitly marked as final
2019 c.param.sym.flags_field |= FINAL | UNION;
2020 }
2021 if (c.param.sym.kind == VAR) {
2022 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2023 }
2024 chk.checkType(c.param.vartype.pos(),
2025 chk.checkClassType(c.param.vartype.pos(), ctype),
2026 syms.throwableType);
2027 attribStat(c.body, catchEnv);
2028 } finally {
2029 catchEnv.info.scope.leave();
2030 }
2031 }
2032
2033 // Attribute finalizer
2034 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2035 result = null;
2036 }
2037 finally {
2038 localEnv.info.scope.leave();
2039 }
2040 }
2041
2042 void checkAutoCloseable(Env<AttrContext> env, JCTree tree, boolean useSite) {
2043 DiagnosticPosition pos = tree.pos();
2044 Type resource = tree.type;
2045 if (!resource.isErroneous() &&
2046 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2047 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2048 Symbol close = syms.noSymbol;
2049 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2050 try {
2051 close = rs.resolveQualifiedMethod(pos,
2052 env,
2053 types.skipTypeVars(resource, false),
2054 names.close,
2055 List.nil(),
2056 List.nil());
2057 }
2058 finally {
2059 log.popDiagnosticHandler(discardHandler);
2060 }
2061 if (close.kind == MTH &&
2062 (useSite || close.owner != syms.autoCloseableType.tsym) &&
2063 ((MethodSymbol)close).binaryOverrides(syms.autoCloseableClose, resource.tsym, types) &&
2064 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2065 if (!useSite && close.owner == resource.tsym) {
2066 log.warning(TreeInfo.diagnosticPositionFor(close, tree),
2067 LintWarnings.TryResourceCanThrowInterruptedExc(resource));
2068 } else {
2069 log.warning(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2070 }
2071 }
2072 }
2073 }
2074
2075 public void visitConditional(JCConditional tree) {
2076 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2077 MatchBindings condBindings = matchBindings;
2078
2079 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2080 isBooleanOrNumeric(env, tree)) ?
2081 PolyKind.STANDALONE : PolyKind.POLY;
2082
2083 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2084 //this means we are returning a poly conditional from void-compatible lambda expression
2085 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2086 result = tree.type = types.createErrorType(resultInfo.pt);
2087 return;
2088 }
2089
2090 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2091 unknownExprInfo :
2092 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2093
2094
2095 // x ? y : z
2096 // include x's bindings when true in y
2097 // include x's bindings when false in z
2098
2099 Type truetype;
2100 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2101 try {
2102 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2103 } finally {
2104 trueEnv.info.scope.leave();
2105 }
2106
2107 MatchBindings trueBindings = matchBindings;
2108
2109 Type falsetype;
2110 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2111 try {
2112 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2113 } finally {
2114 falseEnv.info.scope.leave();
2115 }
2116
2117 MatchBindings falseBindings = matchBindings;
2118
2119 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2120 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2121 List.of(truetype, falsetype)) : pt();
2122 if (condtype.constValue() != null &&
2123 truetype.constValue() != null &&
2124 falsetype.constValue() != null &&
2125 !owntype.hasTag(NONE)) {
2126 //constant folding
2127 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2128 }
2129 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2130 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2131 }
2132 //where
2133 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2134 switch (tree.getTag()) {
2135 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2136 ((JCLiteral)tree).typetag == BOOLEAN ||
2137 ((JCLiteral)tree).typetag == BOT;
2138 case LAMBDA: case REFERENCE: return false;
2139 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2140 case CONDEXPR:
2141 JCConditional condTree = (JCConditional)tree;
2142 return isBooleanOrNumeric(env, condTree.truepart) &&
2143 isBooleanOrNumeric(env, condTree.falsepart);
2144 case APPLY:
2145 JCMethodInvocation speculativeMethodTree =
2146 (JCMethodInvocation)deferredAttr.attribSpeculative(
2147 tree, env, unknownExprInfo,
2148 argumentAttr.withLocalCacheContext());
2149 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2150 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2151 env.enclClass.type :
2152 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2153 Type owntype = types.memberType(receiverType, msym).getReturnType();
2154 return primitiveOrBoxed(owntype);
2155 case NEWCLASS:
2156 JCExpression className =
2157 removeClassParams.translate(((JCNewClass)tree).clazz);
2158 JCExpression speculativeNewClassTree =
2159 (JCExpression)deferredAttr.attribSpeculative(
2160 className, env, unknownTypeInfo,
2161 argumentAttr.withLocalCacheContext());
2162 return primitiveOrBoxed(speculativeNewClassTree.type);
2163 default:
2164 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2165 argumentAttr.withLocalCacheContext()).type;
2166 return primitiveOrBoxed(speculativeType);
2167 }
2168 }
2169 //where
2170 boolean primitiveOrBoxed(Type t) {
2171 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2172 }
2173
2174 TreeTranslator removeClassParams = new TreeTranslator() {
2175 @Override
2176 public void visitTypeApply(JCTypeApply tree) {
2177 result = translate(tree.clazz);
2178 }
2179 };
2180
2181 CheckContext conditionalContext(CheckContext checkContext) {
2182 return new Check.NestedCheckContext(checkContext) {
2183 //this will use enclosing check context to check compatibility of
2184 //subexpression against target type; if we are in a method check context,
2185 //depending on whether boxing is allowed, we could have incompatibilities
2186 @Override
2187 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2188 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2189 }
2190 };
2191 }
2192
2193 /** Compute the type of a conditional expression, after
2194 * checking that it exists. See JLS 15.25. Does not take into
2195 * account the special case where condition and both arms
2196 * are constants.
2197 *
2198 * @param pos The source position to be used for error
2199 * diagnostics.
2200 * @param thentype The type of the expression's then-part.
2201 * @param elsetype The type of the expression's else-part.
2202 */
2203 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2204 if (condTypes.isEmpty()) {
2205 return syms.objectType; //TODO: how to handle?
2206 }
2207 Type first = condTypes.head;
2208 // If same type, that is the result
2209 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2210 return first.baseType();
2211
2212 List<Type> unboxedTypes = condTypes.stream()
2213 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2214 .collect(List.collector());
2215
2216 // Otherwise, if both arms can be converted to a numeric
2217 // type, return the least numeric type that fits both arms
2218 // (i.e. return larger of the two, or return int if one
2219 // arm is short, the other is char).
2220 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2221 // If one arm has an integer subrange type (i.e., byte,
2222 // short, or char), and the other is an integer constant
2223 // that fits into the subrange, return the subrange type.
2224 for (Type type : unboxedTypes) {
2225 if (!type.getTag().isStrictSubRangeOf(INT)) {
2226 continue;
2227 }
2228 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2229 return type.baseType();
2230 }
2231
2232 for (TypeTag tag : primitiveTags) {
2233 Type candidate = syms.typeOfTag[tag.ordinal()];
2234 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2235 return candidate;
2236 }
2237 }
2238 }
2239
2240 // Those were all the cases that could result in a primitive
2241 condTypes = condTypes.stream()
2242 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2243 .collect(List.collector());
2244
2245 for (Type type : condTypes) {
2246 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2247 return type.baseType();
2248 }
2249
2250 Iterator<DiagnosticPosition> posIt = positions.iterator();
2251
2252 condTypes = condTypes.stream()
2253 .map(t -> chk.checkNonVoid(posIt.next(), t))
2254 .collect(List.collector());
2255
2256 // both are known to be reference types. The result is
2257 // lub(thentype,elsetype). This cannot fail, as it will
2258 // always be possible to infer "Object" if nothing better.
2259 return types.lub(condTypes.stream()
2260 .map(t -> t.baseType())
2261 .filter(t -> !t.hasTag(BOT))
2262 .collect(List.collector()));
2263 }
2264
2265 static final TypeTag[] primitiveTags = new TypeTag[]{
2266 BYTE,
2267 CHAR,
2268 SHORT,
2269 INT,
2270 LONG,
2271 FLOAT,
2272 DOUBLE,
2273 BOOLEAN,
2274 };
2275
2276 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2277 return bindingEnv(env, env.tree, bindings);
2278 }
2279
2280 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2281 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2282 bindings.forEach(env1.info.scope::enter);
2283 return env1;
2284 }
2285
2286 public void visitIf(JCIf tree) {
2287 attribExpr(tree.cond, env, syms.booleanType);
2288
2289 // if (x) { y } [ else z ]
2290 // include x's bindings when true in y
2291 // include x's bindings when false in z
2292
2293 MatchBindings condBindings = matchBindings;
2294 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2295
2296 try {
2297 attribStat(tree.thenpart, thenEnv);
2298 } finally {
2299 thenEnv.info.scope.leave();
2300 }
2301
2302 preFlow(tree.thenpart);
2303 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2304 boolean aliveAfterElse;
2305
2306 if (tree.elsepart != null) {
2307 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2308 try {
2309 attribStat(tree.elsepart, elseEnv);
2310 } finally {
2311 elseEnv.info.scope.leave();
2312 }
2313 preFlow(tree.elsepart);
2314 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2315 } else {
2316 aliveAfterElse = true;
2317 }
2318
2319 chk.checkEmptyIf(tree);
2320
2321 List<BindingSymbol> afterIfBindings = List.nil();
2322
2323 if (aliveAfterThen && !aliveAfterElse) {
2324 afterIfBindings = condBindings.bindingsWhenTrue;
2325 } else if (aliveAfterElse && !aliveAfterThen) {
2326 afterIfBindings = condBindings.bindingsWhenFalse;
2327 }
2328
2329 addBindings2Scope(tree, afterIfBindings);
2330
2331 result = null;
2332 }
2333
2334 void preFlow(JCTree tree) {
2335 attrRecover.doRecovery();
2336 new PostAttrAnalyzer() {
2337 @Override
2338 public void scan(JCTree tree) {
2339 if (tree == null ||
2340 (tree.type != null &&
2341 tree.type == Type.stuckType)) {
2342 //don't touch stuck expressions!
2343 return;
2344 }
2345 super.scan(tree);
2346 }
2347
2348 @Override
2349 public void visitClassDef(JCClassDecl that) {
2350 if (that.sym != null) {
2351 // Method preFlow shouldn't visit class definitions
2352 // that have not been entered and attributed.
2353 // See JDK-8254557 and JDK-8203277 for more details.
2354 super.visitClassDef(that);
2355 }
2356 }
2357
2358 @Override
2359 public void visitLambda(JCLambda that) {
2360 if (that.type != null) {
2361 // Method preFlow shouldn't visit lambda expressions
2362 // that have not been entered and attributed.
2363 // See JDK-8254557 and JDK-8203277 for more details.
2364 super.visitLambda(that);
2365 }
2366 }
2367 }.scan(tree);
2368 }
2369
2370 public void visitExec(JCExpressionStatement tree) {
2371 //a fresh environment is required for 292 inference to work properly ---
2372 //see Infer.instantiatePolymorphicSignatureInstance()
2373 Env<AttrContext> localEnv = env.dup(tree);
2374 attribExpr(tree.expr, localEnv);
2375 result = null;
2376 }
2377
2378 public void visitBreak(JCBreak tree) {
2379 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2380 result = null;
2381 }
2382
2383 public void visitYield(JCYield tree) {
2384 if (env.info.yieldResult != null) {
2385 attribTree(tree.value, env, env.info.yieldResult);
2386 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2387 } else {
2388 log.error(tree.pos(), tree.value.hasTag(PARENS)
2389 ? Errors.NoSwitchExpressionQualify
2390 : Errors.NoSwitchExpression);
2391 attribTree(tree.value, env, unknownExprInfo);
2392 }
2393 result = null;
2394 }
2395
2396 public void visitContinue(JCContinue tree) {
2397 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2398 result = null;
2399 }
2400 //where
2401 /** Return the target of a break, continue or yield statement,
2402 * if it exists, report an error if not.
2403 * Note: The target of a labelled break or continue is the
2404 * (non-labelled) statement tree referred to by the label,
2405 * not the tree representing the labelled statement itself.
2406 *
2407 * @param pos The position to be used for error diagnostics
2408 * @param tag The tag of the jump statement. This is either
2409 * Tree.BREAK or Tree.CONTINUE.
2410 * @param label The label of the jump statement, or null if no
2411 * label is given.
2412 * @param env The environment current at the jump statement.
2413 */
2414 private JCTree findJumpTarget(DiagnosticPosition pos,
2415 JCTree.Tag tag,
2416 Name label,
2417 Env<AttrContext> env) {
2418 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2419
2420 if (jumpTarget.snd != null) {
2421 log.error(pos, jumpTarget.snd);
2422 }
2423
2424 return jumpTarget.fst;
2425 }
2426 /** Return the target of a break or continue statement, if it exists,
2427 * report an error if not.
2428 * Note: The target of a labelled break or continue is the
2429 * (non-labelled) statement tree referred to by the label,
2430 * not the tree representing the labelled statement itself.
2431 *
2432 * @param tag The tag of the jump statement. This is either
2433 * Tree.BREAK or Tree.CONTINUE.
2434 * @param label The label of the jump statement, or null if no
2435 * label is given.
2436 * @param env The environment current at the jump statement.
2437 */
2438 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2439 Name label,
2440 Env<AttrContext> env) {
2441 // Search environments outwards from the point of jump.
2442 Env<AttrContext> env1 = env;
2443 JCDiagnostic.Error pendingError = null;
2444 LOOP:
2445 while (env1 != null) {
2446 switch (env1.tree.getTag()) {
2447 case LABELLED:
2448 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2449 if (label == labelled.label) {
2450 // If jump is a continue, check that target is a loop.
2451 if (tag == CONTINUE) {
2452 if (!labelled.body.hasTag(DOLOOP) &&
2453 !labelled.body.hasTag(WHILELOOP) &&
2454 !labelled.body.hasTag(FORLOOP) &&
2455 !labelled.body.hasTag(FOREACHLOOP)) {
2456 pendingError = Errors.NotLoopLabel(label);
2457 }
2458 // Found labelled statement target, now go inwards
2459 // to next non-labelled tree.
2460 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2461 } else {
2462 return Pair.of(labelled, pendingError);
2463 }
2464 }
2465 break;
2466 case DOLOOP:
2467 case WHILELOOP:
2468 case FORLOOP:
2469 case FOREACHLOOP:
2470 if (label == null) return Pair.of(env1.tree, pendingError);
2471 break;
2472 case SWITCH:
2473 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2474 break;
2475 case SWITCH_EXPRESSION:
2476 if (tag == YIELD) {
2477 return Pair.of(env1.tree, null);
2478 } else if (tag == BREAK) {
2479 pendingError = Errors.BreakOutsideSwitchExpression;
2480 } else {
2481 pendingError = Errors.ContinueOutsideSwitchExpression;
2482 }
2483 break;
2484 case LAMBDA:
2485 case METHODDEF:
2486 case CLASSDEF:
2487 break LOOP;
2488 default:
2489 }
2490 env1 = env1.next;
2491 }
2492 if (label != null)
2493 return Pair.of(null, Errors.UndefLabel(label));
2494 else if (pendingError != null)
2495 return Pair.of(null, pendingError);
2496 else if (tag == CONTINUE)
2497 return Pair.of(null, Errors.ContOutsideLoop);
2498 else
2499 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2500 }
2501
2502 public void visitReturn(JCReturn tree) {
2503 // Check that there is an enclosing method which is
2504 // nested within than the enclosing class.
2505 if (env.info.returnResult == null) {
2506 log.error(tree.pos(), Errors.RetOutsideMeth);
2507 } else if (env.info.yieldResult != null) {
2508 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2509 if (tree.expr != null) {
2510 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2511 }
2512 } else if (!env.info.isLambda &&
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 }
2610 } else if (tree.meth.hasTag(SELECT)) {
2611 log.error(tree.meth.pos(),
2612 Errors.IllegalQualNotIcls(site.tsym));
2613 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2614 }
2615
2616 if (tree.meth.hasTag(IDENT)) {
2617 // non-qualified super(...) call; check whether explicit constructor
2618 // invocation is well-formed. If the super class is an inner class,
2619 // make sure that an appropriate implicit qualifier exists. If the super
2620 // class is a local class, make sure that the current class is defined
2621 // in the same context as the local class.
2622 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2623 }
2624
2625 // if we're calling a java.lang.Enum constructor,
2626 // prefix the implicit String and int parameters
2627 if (site.tsym == syms.enumSym)
2628 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2629
2630 // Resolve the called constructor under the assumption
2631 // that we are referring to a superclass instance of the
2632 // current instance (JLS ???).
2633 boolean selectSuperPrev = localEnv.info.selectSuper;
2634 localEnv.info.selectSuper = true;
2635 localEnv.info.pendingResolutionPhase = null;
2636 Symbol sym = rs.resolveConstructor(
2637 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2638 localEnv.info.selectSuper = selectSuperPrev;
2639
2640 // Set method symbol to resolved constructor...
2641 TreeInfo.setSymbol(tree.meth, sym);
2642
2643 // ...and check that it is legal in the current context.
2644 // (this will also set the tree's type)
2645 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2646 checkId(tree.meth, site, sym, localEnv,
2647 new ResultInfo(kind, mpt));
2648 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2649 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2650 }
2651 // Otherwise, `site' is an error type and we do nothing
2652 result = tree.type = syms.voidType;
2653 } else {
2654 // Otherwise, we are seeing a regular method call.
2655 // Attribute the arguments, yielding list of argument types, ...
2656 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2657 argtypes = argtypesBuf.toList();
2658 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2659
2660 // ... and attribute the method using as a prototype a methodtype
2661 // whose formal argument types is exactly the list of actual
2662 // arguments (this will also set the method symbol).
2663 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2664 localEnv.info.pendingResolutionPhase = null;
2665 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2666
2667 // Compute the result type.
2668 Type restype = mtype.getReturnType();
2669 if (restype.hasTag(WILDCARD))
2670 throw new AssertionError(mtype);
2671
2672 Type qualifier = (tree.meth.hasTag(SELECT))
2673 ? ((JCFieldAccess) tree.meth).selected.type
2674 : env.enclClass.sym.type;
2675 Symbol msym = TreeInfo.symbol(tree.meth);
2676 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2677
2678 chk.checkRefTypes(tree.typeargs, typeargtypes);
2679
2680 // Check that value of resulting type is admissible in the
2681 // current context. Also, capture the return type
2682 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2683 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2684 }
2685 chk.checkRequiresIdentity(tree, env.info.lint);
2686 chk.validate(tree.typeargs, localEnv);
2687 }
2688 //where
2689 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2690 if (msym != null &&
2691 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2692 methodName == names.getClass &&
2693 argtypes.isEmpty()) {
2694 // as a special case, x.getClass() has type Class<? extends |X|>
2695 return new ClassType(restype.getEnclosingType(),
2696 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2697 BoundKind.EXTENDS,
2698 syms.boundClass)),
2699 restype.tsym,
2700 restype.getMetadata());
2701 } else if (msym != null &&
2702 msym.owner == syms.arrayClass &&
2703 methodName == names.clone &&
2704 types.isArray(qualifierType)) {
2705 // as a special case, array.clone() has a result that is
2706 // the same as static type of the array being cloned
2707 return qualifierType;
2708 } else {
2709 return restype;
2710 }
2711 }
2712
2713 /** Obtain a method type with given argument types.
2714 */
2715 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2716 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2717 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2718 }
2719
2720 public void visitNewClass(final JCNewClass tree) {
2721 Type owntype = types.createErrorType(tree.type);
2722
2723 // The local environment of a class creation is
2724 // a new environment nested in the current one.
2725 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2726
2727 // The anonymous inner class definition of the new expression,
2728 // if one is defined by it.
2729 JCClassDecl cdef = tree.def;
2730
2731 // If enclosing class is given, attribute it, and
2732 // complete class name to be fully qualified
2733 JCExpression clazz = tree.clazz; // Class field following new
2734 JCExpression clazzid; // Identifier in class field
2735 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2736 annoclazzid = null;
2737
2738 if (clazz.hasTag(TYPEAPPLY)) {
2739 clazzid = ((JCTypeApply) clazz).clazz;
2740 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2741 annoclazzid = (JCAnnotatedType) clazzid;
2742 clazzid = annoclazzid.underlyingType;
2743 }
2744 } else {
2745 if (clazz.hasTag(ANNOTATED_TYPE)) {
2746 annoclazzid = (JCAnnotatedType) clazz;
2747 clazzid = annoclazzid.underlyingType;
2748 } else {
2749 clazzid = clazz;
2750 }
2751 }
2752
2753 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2754
2755 if (tree.encl != null) {
2756 // We are seeing a qualified new, of the form
2757 // <expr>.new C <...> (...) ...
2758 // In this case, we let clazz stand for the name of the
2759 // allocated class C prefixed with the type of the qualifier
2760 // expression, so that we can
2761 // resolve it with standard techniques later. I.e., if
2762 // <expr> has type T, then <expr>.new C <...> (...)
2763 // yields a clazz T.C.
2764 Type encltype = chk.checkRefType(tree.encl.pos(),
2765 attribExpr(tree.encl, env));
2766 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2767 // from expr to the combined type, or not? Yes, do this.
2768 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2769 ((JCIdent) clazzid).name);
2770
2771 clazzid1.endpos = clazzid.getEndPosition();
2772 if (clazz.hasTag(ANNOTATED_TYPE)) {
2773 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2774 List<JCAnnotation> annos = annoType.annotations;
2775
2776 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2777 clazzid1 = make.at(tree.pos).
2778 TypeApply(clazzid1,
2779 ((JCTypeApply) clazz).arguments);
2780 }
2781
2782 clazzid1 = make.at(tree.pos).
2783 AnnotatedType(annos, clazzid1);
2784 } else if (clazz.hasTag(TYPEAPPLY)) {
2785 clazzid1 = make.at(tree.pos).
2786 TypeApply(clazzid1,
2787 ((JCTypeApply) clazz).arguments);
2788 }
2789
2790 clazz = clazzid1;
2791 }
2792
2793 // Attribute clazz expression and store
2794 // symbol + type back into the attributed tree.
2795 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
2796 attribIdentAsEnumType(env, (JCIdent)clazz) :
2797 attribType(clazz, env);
2798
2799 clazztype = chk.checkDiamond(tree, clazztype);
2800 chk.validate(clazz, localEnv);
2801 if (tree.encl != null) {
2802 // We have to work in this case to store
2803 // symbol + type back into the attributed tree.
2804 tree.clazz.type = clazztype;
2805 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2806 clazzid.type = ((JCIdent) clazzid).sym.type;
2807 if (annoclazzid != null) {
2808 annoclazzid.type = clazzid.type;
2809 }
2810 if (!clazztype.isErroneous()) {
2811 if (cdef != null && clazztype.tsym.isInterface()) {
2812 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2813 } else if (clazztype.tsym.isStatic()) {
2814 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2815 }
2816 }
2817 } else {
2818 // Check for the existence of an apropos outer instance
2819 checkNewInnerClass(tree.pos(), env, clazztype, false);
2820 }
2821
2822 checkBreakTree(tree.clazz, localEnv);
2823
2824 // Attribute constructor arguments.
2825 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2826 final KindSelector pkind =
2827 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2828 List<Type> argtypes = argtypesBuf.toList();
2829 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2830
2831 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2832 // Enums may not be instantiated except implicitly
2833 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2834 (!env.tree.hasTag(VARDEF) ||
2835 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2836 ((JCVariableDecl) env.tree).init != tree))
2837 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2838
2839 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2840 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2841 boolean skipNonDiamondPath = false;
2842 // Check that class is not abstract
2843 if (cdef == null && !tree.classDeclRemoved() && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2844 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2845 log.error(tree.pos(),
2846 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2847 skipNonDiamondPath = true;
2848 } else if (cdef != null && clazztype.tsym.isInterface()) {
2849 // Check that no constructor arguments are given to
2850 // anonymous classes implementing an interface
2851 if (!argtypes.isEmpty())
2852 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2853
2854 if (!typeargtypes.isEmpty())
2855 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2856
2857 // Error recovery: pretend no arguments were supplied.
2858 argtypes = List.nil();
2859 typeargtypes = List.nil();
2860 skipNonDiamondPath = true;
2861 }
2862 if (TreeInfo.isDiamond(tree)) {
2863 ClassType site = new ClassType(clazztype.getEnclosingType(),
2864 clazztype.tsym.type.getTypeArguments(),
2865 clazztype.tsym,
2866 clazztype.getMetadata());
2867
2868 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2869 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2870 diamondEnv.info.pendingResolutionPhase = null;
2871
2872 //if the type of the instance creation expression is a class type
2873 //apply method resolution inference (JLS 15.12.2.7). The return type
2874 //of the resolved constructor will be a partially instantiated type
2875 Symbol constructor = rs.resolveDiamond(tree.pos(),
2876 diamondEnv,
2877 site,
2878 argtypes,
2879 typeargtypes);
2880 tree.constructor = constructor.baseSymbol();
2881
2882 final TypeSymbol csym = clazztype.tsym;
2883 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2884 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2885 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2886 constructorType = checkId(tree, site,
2887 constructor,
2888 diamondEnv,
2889 diamondResult);
2890
2891 tree.clazz.type = types.createErrorType(clazztype);
2892 if (!constructorType.isErroneous()) {
2893 tree.clazz.type = clazz.type = constructorType.getReturnType();
2894 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2895 }
2896 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2897 }
2898
2899 // Resolve the called constructor under the assumption
2900 // that we are referring to a superclass instance of the
2901 // current instance (JLS ???).
2902 else if (!skipNonDiamondPath) {
2903 //the following code alters some of the fields in the current
2904 //AttrContext - hence, the current context must be dup'ed in
2905 //order to avoid downstream failures
2906 Env<AttrContext> rsEnv = localEnv.dup(tree);
2907 rsEnv.info.selectSuper = cdef != null;
2908 rsEnv.info.pendingResolutionPhase = null;
2909 tree.constructor = rs.resolveConstructor(
2910 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2911 if (cdef == null) { //do not check twice!
2912 tree.constructorType = checkId(tree,
2913 clazztype,
2914 tree.constructor,
2915 rsEnv,
2916 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2917 if (rsEnv.info.lastResolveVarargs())
2918 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2919 }
2920 }
2921
2922 chk.checkRequiresIdentity(tree, env.info.lint);
2923
2924 if (cdef != null) {
2925 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2926 return;
2927 }
2928
2929 if (tree.constructor != null && tree.constructor.kind == MTH)
2930 owntype = clazztype;
2931 }
2932 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2933 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2934 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2935 //we need to wait for inference to finish and then replace inference vars in the constructor type
2936 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2937 instantiatedContext -> {
2938 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2939 });
2940 }
2941 chk.validate(tree.typeargs, localEnv);
2942 }
2943
2944 // where
2945 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2946 JCClassDecl cdef, Env<AttrContext> localEnv,
2947 List<Type> argtypes, List<Type> typeargtypes,
2948 KindSelector pkind) {
2949 // We are seeing an anonymous class instance creation.
2950 // In this case, the class instance creation
2951 // expression
2952 //
2953 // E.new <typeargs1>C<typargs2>(args) { ... }
2954 //
2955 // is represented internally as
2956 //
2957 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2958 //
2959 // This expression is then *transformed* as follows:
2960 //
2961 // (1) add an extends or implements clause
2962 // (2) add a constructor.
2963 //
2964 // For instance, if C is a class, and ET is the type of E,
2965 // the expression
2966 //
2967 // E.new <typeargs1>C<typargs2>(args) { ... }
2968 //
2969 // is translated to (where X is a fresh name and typarams is the
2970 // parameter list of the super constructor):
2971 //
2972 // new <typeargs1>X(<*nullchk*>E, args) where
2973 // X extends C<typargs2> {
2974 // <typarams> X(ET e, args) {
2975 // e.<typeargs1>super(args)
2976 // }
2977 // ...
2978 // }
2979 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2980 Type enclType = clazztype.getEnclosingType();
2981 if (enclType != null &&
2982 enclType.hasTag(CLASS) &&
2983 !chk.checkDenotable((ClassType)enclType)) {
2984 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2985 }
2986 final boolean isDiamond = TreeInfo.isDiamond(tree);
2987 if (isDiamond
2988 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2989 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2990 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2991 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2992 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2993 instantiatedContext -> {
2994 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2995 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2996 ResultInfo prevResult = this.resultInfo;
2997 try {
2998 this.resultInfo = resultInfoForClassDefinition;
2999 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3000 dupLocalEnv, argtypes, typeargtypes, pkind);
3001 } finally {
3002 this.resultInfo = prevResult;
3003 }
3004 });
3005 } else {
3006 if (isDiamond && clazztype.hasTag(CLASS)) {
3007 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3008 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3009 // One or more types inferred in the previous steps is non-denotable.
3010 Fragment fragment = Diamond(clazztype.tsym);
3011 log.error(tree.clazz.pos(),
3012 Errors.CantApplyDiamond1(
3013 fragment,
3014 invalidDiamondArgs.size() > 1 ?
3015 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3016 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3017 }
3018 // For <>(){}, inferred types must also be accessible.
3019 for (Type t : clazztype.getTypeArguments()) {
3020 rs.checkAccessibleType(env, t);
3021 }
3022 }
3023
3024 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3025 // false for isInterface call even when the original type is an interface.
3026 boolean implementing = clazztype.tsym.isInterface() ||
3027 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3028 clazztype.getOriginalType().tsym.isInterface();
3029
3030 if (implementing) {
3031 cdef.implementing = List.of(clazz);
3032 } else {
3033 cdef.extending = clazz;
3034 }
3035
3036 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3037 rs.isSerializable(clazztype)) {
3038 localEnv.info.isSerializable = true;
3039 }
3040
3041 attribStat(cdef, localEnv);
3042
3043 List<Type> finalargtypes;
3044 // If an outer instance is given,
3045 // prefix it to the constructor arguments
3046 // and delete it from the new expression
3047 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3048 finalargtypes = argtypes.prepend(tree.encl.type);
3049 } else {
3050 finalargtypes = argtypes;
3051 }
3052
3053 // Reassign clazztype and recompute constructor. As this necessarily involves
3054 // another attribution pass for deferred types in the case of <>, replicate
3055 // them. Original arguments have right decorations already.
3056 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3057 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3058 }
3059
3060 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3061 : cdef.sym.type;
3062 Symbol sym = tree.constructor = rs.resolveConstructor(
3063 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3064 Assert.check(!sym.kind.isResolutionError());
3065 tree.constructor = sym;
3066 tree.constructorType = checkId(tree,
3067 clazztype,
3068 tree.constructor,
3069 localEnv,
3070 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3071 }
3072 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3073 clazztype : types.createErrorType(tree.type);
3074 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3075 chk.validate(tree.typeargs, localEnv);
3076 }
3077
3078 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3079 return new Check.NestedCheckContext(checkContext) {
3080 @Override
3081 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3082 enclosingContext.report(clazz.clazz,
3083 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3084 }
3085 };
3086 }
3087
3088 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3089 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3090 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3091 (!isLocal && !type.tsym.isInner()) ||
3092 (isSuper && env.enclClass.sym.isAnonymous())) {
3093 // nothing to check
3094 return;
3095 }
3096 Symbol res = isLocal ?
3097 rs.findLocalClassOwner(env, type.tsym) :
3098 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3099 if (res.exists()) {
3100 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3101 } else {
3102 log.error(pos, Errors.EnclClassRequired(type.tsym));
3103 }
3104 }
3105
3106 /** Make an attributed null check tree.
3107 */
3108 public JCExpression makeNullCheck(JCExpression arg) {
3109 // optimization: new Outer() can never be null; skip null check
3110 if (arg.getTag() == NEWCLASS)
3111 return arg;
3112 // optimization: X.this is never null; skip null check
3113 Name name = TreeInfo.name(arg);
3114 if (name == names._this || name == names._super) return arg;
3115
3116 JCTree.Tag optag = NULLCHK;
3117 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3118 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3119 tree.type = arg.type;
3120 return tree;
3121 }
3122
3123 public void visitNewArray(JCNewArray tree) {
3124 Type owntype = types.createErrorType(tree.type);
3125 Env<AttrContext> localEnv = env.dup(tree);
3126 Type elemtype;
3127 if (tree.elemtype != null) {
3128 elemtype = attribType(tree.elemtype, localEnv);
3129 chk.validate(tree.elemtype, localEnv);
3130 owntype = elemtype;
3131 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3132 attribExpr(l.head, localEnv, syms.intType);
3133 owntype = new ArrayType(owntype, syms.arrayClass);
3134 }
3135 } else {
3136 // we are seeing an untyped aggregate { ... }
3137 // this is allowed only if the prototype is an array
3138 if (pt().hasTag(ARRAY)) {
3139 elemtype = types.elemtype(pt());
3140 } else {
3141 if (!pt().hasTag(ERROR) &&
3142 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3143 log.error(tree.pos(),
3144 Errors.IllegalInitializerForType(pt()));
3145 }
3146 elemtype = types.createErrorType(pt());
3147 }
3148 }
3149 if (tree.elems != null) {
3150 attribExprs(tree.elems, localEnv, elemtype);
3151 owntype = new ArrayType(elemtype, syms.arrayClass);
3152 }
3153 if (!types.isReifiable(elemtype))
3154 log.error(tree.pos(), Errors.GenericArrayCreation);
3155 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3156 }
3157
3158 /*
3159 * A lambda expression can only be attributed when a target-type is available.
3160 * In addition, if the target-type is that of a functional interface whose
3161 * descriptor contains inference variables in argument position the lambda expression
3162 * is 'stuck' (see DeferredAttr).
3163 */
3164 @Override
3165 public void visitLambda(final JCLambda that) {
3166 boolean wrongContext = false;
3167 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3168 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3169 //lambda only allowed in assignment or method invocation/cast context
3170 log.error(that.pos(), Errors.UnexpectedLambda);
3171 }
3172 resultInfo = recoveryInfo;
3173 wrongContext = true;
3174 }
3175 //create an environment for attribution of the lambda expression
3176 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3177 boolean needsRecovery =
3178 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3179 try {
3180 if (needsRecovery && rs.isSerializable(pt())) {
3181 localEnv.info.isSerializable = true;
3182 localEnv.info.isSerializableLambda = true;
3183 }
3184 List<Type> explicitParamTypes = null;
3185 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3186 //attribute lambda parameters
3187 attribStats(that.params, localEnv);
3188 explicitParamTypes = TreeInfo.types(that.params);
3189 }
3190
3191 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3192 Type currentTarget = targetInfo.target;
3193 Type lambdaType = targetInfo.descriptor;
3194
3195 if (currentTarget.isErroneous()) {
3196 result = that.type = currentTarget;
3197 return;
3198 }
3199
3200 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3201
3202 if (lambdaType.hasTag(FORALL)) {
3203 //lambda expression target desc cannot be a generic method
3204 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3205 kindName(currentTarget.tsym),
3206 currentTarget.tsym);
3207 resultInfo.checkContext.report(that, diags.fragment(msg));
3208 result = that.type = types.createErrorType(pt());
3209 return;
3210 }
3211
3212 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3213 //add param type info in the AST
3214 List<Type> actuals = lambdaType.getParameterTypes();
3215 List<JCVariableDecl> params = that.params;
3216
3217 boolean arityMismatch = false;
3218
3219 while (params.nonEmpty()) {
3220 if (actuals.isEmpty()) {
3221 //not enough actuals to perform lambda parameter inference
3222 arityMismatch = true;
3223 }
3224 //reset previously set info
3225 Type argType = arityMismatch ?
3226 syms.errType :
3227 actuals.head;
3228 if (params.head.type == null &&
3229 params.head.isImplicitlyTyped()) { //error recovery
3230 params.head.type = argType;
3231 setupImplicitlyTypedVariable(params.head, argType);
3232 }
3233 params.head.sym = null;
3234 actuals = actuals.isEmpty() ?
3235 actuals :
3236 actuals.tail;
3237 params = params.tail;
3238 }
3239
3240 //attribute lambda parameters
3241 attribStats(that.params, localEnv);
3242
3243 if (arityMismatch) {
3244 resultInfo.checkContext.report(that, diags.fragment(Fragments.WrongNumberArgsInLambda(currentTarget.tsym)));
3245 result = that.type = types.createErrorType(currentTarget);
3246 return;
3247 }
3248 }
3249
3250 //from this point on, no recovery is needed; if we are in assignment context
3251 //we will be able to attribute the whole lambda body, regardless of errors;
3252 //if we are in a 'check' method context, and the lambda is not compatible
3253 //with the target-type, it will be recovered anyway in Attr.checkId
3254 needsRecovery = false;
3255
3256 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3257 lambdaBodyResult(that, lambdaType, resultInfo);
3258
3259 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3260 attribTree(that.getBody(), localEnv, bodyResultInfo);
3261 } else {
3262 JCBlock body = (JCBlock)that.body;
3263
3264 checkBreakTree(body, localEnv);
3265 attribStats(body.stats, localEnv);
3266 }
3267
3268 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3269
3270 boolean isSpeculativeRound =
3271 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3272
3273 preFlow(that);
3274 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3275
3276 that.type = currentTarget; //avoids recovery at this stage
3277 checkLambdaCompatible(that, lambdaType, currentTarget.tsym, resultInfo.checkContext);
3278
3279 if (!isSpeculativeRound) {
3280 //add thrown types as bounds to the thrown types free variables if needed:
3281 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3282 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3283 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3284 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3285 }
3286 }
3287
3288 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3289 }
3290 result = wrongContext ? that.type = types.createErrorType(pt())
3291 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3292 } catch (Types.FunctionDescriptorLookupError ex) {
3293 JCDiagnostic cause = ex.getDiagnostic();
3294 resultInfo.checkContext.report(that, cause);
3295 result = that.type = types.createErrorType(pt());
3296 return;
3297 } catch (CompletionFailure cf) {
3298 chk.completionError(that.pos(), cf);
3299 } catch (Throwable t) {
3300 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3301 //as that would likely cause the same exception again.
3302 needsRecovery = false;
3303 throw t;
3304 } finally {
3305 localEnv.info.scope.leave();
3306 if (needsRecovery) {
3307 Type prevResult = result;
3308 try {
3309 attribTree(that, env, recoveryInfo);
3310 } finally {
3311 if (result == Type.recoveryType) {
3312 result = prevResult;
3313 }
3314 }
3315 }
3316 }
3317 }
3318 //where
3319 class TargetInfo {
3320 Type target;
3321 Type descriptor;
3322
3323 public TargetInfo(Type target, Type descriptor) {
3324 this.target = target;
3325 this.descriptor = descriptor;
3326 }
3327 }
3328
3329 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3330 Type lambdaType;
3331 Type currentTarget = resultInfo.pt;
3332 if (resultInfo.pt != Type.recoveryType) {
3333 /* We need to adjust the target. If the target is an
3334 * intersection type, for example: SAM & I1 & I2 ...
3335 * the target will be updated to SAM
3336 */
3337 currentTarget = targetChecker.visit(currentTarget, that);
3338 if (!currentTarget.isIntersection()) {
3339 if (explicitParamTypes != null) {
3340 currentTarget = infer.instantiateFunctionalInterface(that,
3341 currentTarget, explicitParamTypes, resultInfo.checkContext);
3342 }
3343 currentTarget = types.removeWildcards(currentTarget);
3344 lambdaType = types.findDescriptorType(currentTarget);
3345 } else {
3346 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3347 ListBuffer<Type> components = new ListBuffer<>();
3348 for (Type bound : ict.getExplicitComponents()) {
3349 if (explicitParamTypes != null) {
3350 try {
3351 bound = infer.instantiateFunctionalInterface(that,
3352 bound, explicitParamTypes, resultInfo.checkContext);
3353 } catch (FunctionDescriptorLookupError t) {
3354 // do nothing
3355 }
3356 }
3357 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3358 // bound must be j.l.Object or an interface, but not an annotation
3359 reportIntersectionError(that, "not.an.intf.component", bound);
3360 }
3361 bound = types.removeWildcards(bound);
3362 components.add(bound);
3363 }
3364 currentTarget = types.makeIntersectionType(components.toList());
3365 currentTarget.tsym.flags_field |= INTERFACE;
3366 lambdaType = types.findDescriptorType(currentTarget);
3367 }
3368
3369 } else {
3370 currentTarget = Type.recoveryType;
3371 lambdaType = fallbackDescriptorType(that);
3372 }
3373 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3374 //lambda expression target desc cannot be a generic method
3375 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3376 kindName(currentTarget.tsym),
3377 currentTarget.tsym);
3378 resultInfo.checkContext.report(that, diags.fragment(msg));
3379 currentTarget = types.createErrorType(pt());
3380 }
3381 return new TargetInfo(currentTarget, lambdaType);
3382 }
3383
3384 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3385 resultInfo.checkContext.report(pos,
3386 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3387 }
3388
3389 void preFlow(JCLambda tree) {
3390 attrRecover.doRecovery();
3391 new PostAttrAnalyzer() {
3392 @Override
3393 public void scan(JCTree tree) {
3394 if (tree == null ||
3395 (tree.type != null &&
3396 tree.type == Type.stuckType)) {
3397 //don't touch stuck expressions!
3398 return;
3399 }
3400 super.scan(tree);
3401 }
3402
3403 @Override
3404 public void visitClassDef(JCClassDecl that) {
3405 // or class declaration trees!
3406 }
3407
3408 public void visitLambda(JCLambda that) {
3409 // or lambda expressions!
3410 }
3411 }.scan(tree.body);
3412 }
3413
3414 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3415
3416 @Override
3417 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3418 return t.isIntersection() ?
3419 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3420 }
3421
3422 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3423 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3424 return ict;
3425 }
3426
3427 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3428 ListBuffer<Type> targs = new ListBuffer<>();
3429 ListBuffer<Type> supertypes = new ListBuffer<>();
3430 for (Type i : ict.interfaces_field) {
3431 if (i.isParameterized()) {
3432 targs.appendList(i.tsym.type.allparams());
3433 }
3434 supertypes.append(i.tsym.type);
3435 }
3436 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3437 notionalIntf.allparams_field = targs.toList();
3438 notionalIntf.tsym.flags_field |= INTERFACE;
3439 return notionalIntf.tsym;
3440 }
3441 };
3442
3443 private Type fallbackDescriptorType(JCExpression tree) {
3444 switch (tree.getTag()) {
3445 case LAMBDA:
3446 JCLambda lambda = (JCLambda)tree;
3447 List<Type> argtypes = List.nil();
3448 for (JCVariableDecl param : lambda.params) {
3449 argtypes = !param.isImplicitlyTyped() && param.vartype.type != null ?
3450 argtypes.append(param.vartype.type) :
3451 argtypes.append(syms.errType);
3452 }
3453 return new MethodType(argtypes, Type.recoveryType,
3454 List.of(syms.throwableType), syms.methodClass);
3455 case REFERENCE:
3456 return new MethodType(List.nil(), Type.recoveryType,
3457 List.of(syms.throwableType), syms.methodClass);
3458 default:
3459 Assert.error("Cannot get here!");
3460 }
3461 return null;
3462 }
3463
3464 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3465 final InferenceContext inferenceContext, final Type... ts) {
3466 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3467 }
3468
3469 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3470 final InferenceContext inferenceContext, final List<Type> ts) {
3471 if (inferenceContext.free(ts)) {
3472 inferenceContext.addFreeTypeListener(ts,
3473 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3474 } else {
3475 for (Type t : ts) {
3476 rs.checkAccessibleType(env, t);
3477 }
3478 }
3479 }
3480
3481 /**
3482 * Lambda/method reference have a special check context that ensures
3483 * that i.e. a lambda return type is compatible with the expected
3484 * type according to both the inherited context and the assignment
3485 * context.
3486 */
3487 class FunctionalReturnContext extends Check.NestedCheckContext {
3488
3489 FunctionalReturnContext(CheckContext enclosingContext) {
3490 super(enclosingContext);
3491 }
3492
3493 @Override
3494 public boolean compatible(Type found, Type req, Warner warn) {
3495 //return type must be compatible in both current context and assignment context
3496 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3497 }
3498
3499 @Override
3500 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3501 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3502 }
3503 }
3504
3505 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3506
3507 JCExpression expr;
3508 boolean expStmtExpected;
3509
3510 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3511 super(enclosingContext);
3512 this.expr = expr;
3513 }
3514
3515 @Override
3516 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3517 if (expStmtExpected) {
3518 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3519 } else {
3520 super.report(pos, details);
3521 }
3522 }
3523
3524 @Override
3525 public boolean compatible(Type found, Type req, Warner warn) {
3526 //a void return is compatible with an expression statement lambda
3527 if (req.hasTag(VOID)) {
3528 expStmtExpected = true;
3529 return TreeInfo.isExpressionStatement(expr);
3530 } else {
3531 return super.compatible(found, req, warn);
3532 }
3533 }
3534 }
3535
3536 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3537 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3538 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3539 new FunctionalReturnContext(resultInfo.checkContext);
3540
3541 return descriptor.getReturnType() == Type.recoveryType ?
3542 recoveryInfo :
3543 new ResultInfo(KindSelector.VAL,
3544 descriptor.getReturnType(), funcContext);
3545 }
3546
3547 /**
3548 * Lambda compatibility. Check that given return types, thrown types, parameter types
3549 * are compatible with the expected functional interface descriptor. This means that:
3550 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3551 * types must be compatible with the return type of the expected descriptor.
3552 */
3553 void checkLambdaCompatible(JCLambda tree, Type descriptor, TypeSymbol target, CheckContext checkContext) {
3554 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3555
3556 //return values have already been checked - but if lambda has no return
3557 //values, we must ensure that void/value compatibility is correct;
3558 //this amounts at checking that, if a lambda body can complete normally,
3559 //the descriptor's return type must be void
3560 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3561 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3562 Fragment msg =
3563 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3564 checkContext.report(tree,
3565 diags.fragment(msg));
3566 }
3567
3568 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3569 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3570 checkContext.report(tree, diags.fragment(argTypes.size() != tree.params.size()
3571 ? Fragments.WrongNumberArgsInLambda(target)
3572 : Fragments.IncompatibleArgTypesInLambda(argTypes, TreeInfo.types(tree.params))));
3573 }
3574 }
3575
3576 /* This method returns an environment to be used to attribute a lambda
3577 * expression.
3578 *
3579 * The owner of this environment is a method symbol. If the current owner
3580 * is not a method (e.g. if the lambda occurs in a field initializer), then
3581 * a synthetic method symbol owner is created.
3582 */
3583 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3584 Env<AttrContext> lambdaEnv;
3585 Symbol owner = env.info.scope.owner;
3586 if (owner.kind == VAR && owner.owner.kind == TYP) {
3587 // If the lambda is nested in a field initializer, we need to create a fake init method.
3588 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3589 // init symbol's owner).
3590 ClassSymbol enclClass = owner.enclClass();
3591 Name initName = owner.isStatic() ? names.clinit : names.init;
3592 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3593 initName, initBlockType, enclClass);
3594 initSym.params = List.nil();
3595 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3596 } else {
3597 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3598 }
3599 lambdaEnv.info.yieldResult = null;
3600 lambdaEnv.info.isLambda = true;
3601 return lambdaEnv;
3602 }
3603
3604 @Override
3605 public void visitReference(final JCMemberReference that) {
3606 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3607 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3608 //method reference only allowed in assignment or method invocation/cast context
3609 log.error(that.pos(), Errors.UnexpectedMref);
3610 }
3611 result = that.type = types.createErrorType(pt());
3612 return;
3613 }
3614 final Env<AttrContext> localEnv = env.dup(that);
3615 try {
3616 //attribute member reference qualifier - if this is a constructor
3617 //reference, the expected kind must be a type
3618 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3619
3620 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3621 exprType = chk.checkConstructorRefType(that.expr, exprType);
3622 if (!exprType.isErroneous() &&
3623 exprType.isRaw() &&
3624 that.typeargs != null) {
3625 log.error(that.expr.pos(),
3626 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3627 Fragments.MrefInferAndExplicitParams));
3628 exprType = types.createErrorType(exprType);
3629 }
3630 }
3631
3632 if (exprType.isErroneous()) {
3633 //if the qualifier expression contains problems,
3634 //give up attribution of method reference
3635 result = that.type = exprType;
3636 return;
3637 }
3638
3639 if (TreeInfo.isStaticSelector(that.expr, names)) {
3640 //if the qualifier is a type, validate it; raw warning check is
3641 //omitted as we don't know at this stage as to whether this is a
3642 //raw selector (because of inference)
3643 chk.validate(that.expr, env, false);
3644 } else {
3645 Symbol lhsSym = TreeInfo.symbol(that.expr);
3646 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3647 }
3648 //attrib type-arguments
3649 List<Type> typeargtypes = List.nil();
3650 if (that.typeargs != null) {
3651 typeargtypes = attribTypes(that.typeargs, localEnv);
3652 }
3653
3654 boolean isTargetSerializable =
3655 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3656 rs.isSerializable(pt());
3657 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3658 Type currentTarget = targetInfo.target;
3659 Type desc = targetInfo.descriptor;
3660
3661 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3662 List<Type> argtypes = desc.getParameterTypes();
3663 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3664
3665 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3666 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3667 }
3668
3669 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3670 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3671 try {
3672 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3673 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3674 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3675 } finally {
3676 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3677 }
3678
3679 Symbol refSym = refResult.fst;
3680 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3681
3682 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3683 * JDK-8075541
3684 */
3685 if (refSym.kind != MTH) {
3686 boolean targetError;
3687 switch (refSym.kind) {
3688 case ABSENT_MTH:
3689 targetError = false;
3690 break;
3691 case WRONG_MTH:
3692 case WRONG_MTHS:
3693 case AMBIGUOUS:
3694 case HIDDEN:
3695 case STATICERR:
3696 targetError = true;
3697 break;
3698 default:
3699 Assert.error("unexpected result kind " + refSym.kind);
3700 targetError = false;
3701 }
3702
3703 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3704 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3705 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3706
3707 JCDiagnostic diag = diags.create(log.currentSource(), that,
3708 targetError ?
3709 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3710 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3711
3712 if (targetError && currentTarget == Type.recoveryType) {
3713 //a target error doesn't make sense during recovery stage
3714 //as we don't know what actual parameter types are
3715 result = that.type = currentTarget;
3716 return;
3717 } else {
3718 if (targetError) {
3719 resultInfo.checkContext.report(that, diag);
3720 } else {
3721 log.report(diag);
3722 }
3723 result = that.type = types.createErrorType(currentTarget);
3724 return;
3725 }
3726 }
3727
3728 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3729 that.kind = lookupHelper.referenceKind(that.sym);
3730 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3731
3732 if (desc.getReturnType() == Type.recoveryType) {
3733 // stop here
3734 result = that.type = currentTarget;
3735 return;
3736 }
3737
3738 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3739 checkNewInnerClass(that.pos(), env, exprType, false);
3740 }
3741
3742 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3743
3744 if (that.getMode() == ReferenceMode.INVOKE &&
3745 TreeInfo.isStaticSelector(that.expr, names) &&
3746 that.kind.isUnbound() &&
3747 lookupHelper.site.isRaw()) {
3748 chk.checkRaw(that.expr, localEnv);
3749 }
3750
3751 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3752 exprType.getTypeArguments().nonEmpty()) {
3753 //static ref with class type-args
3754 log.error(that.expr.pos(),
3755 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3756 Fragments.StaticMrefWithTargs));
3757 result = that.type = types.createErrorType(currentTarget);
3758 return;
3759 }
3760
3761 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3762 // Check that super-qualified symbols are not abstract (JLS)
3763 rs.checkNonAbstract(that.pos(), that.sym);
3764 }
3765
3766 if (isTargetSerializable) {
3767 chk.checkAccessFromSerializableElement(that, true);
3768 }
3769 }
3770
3771 ResultInfo checkInfo =
3772 resultInfo.dup(newMethodTemplate(
3773 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3774 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3775 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3776
3777 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3778
3779 if (that.kind.isUnbound() &&
3780 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3781 //re-generate inference constraints for unbound receiver
3782 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3783 //cannot happen as this has already been checked - we just need
3784 //to regenerate the inference constraints, as that has been lost
3785 //as a result of the call to inferenceContext.save()
3786 Assert.error("Can't get here");
3787 }
3788 }
3789
3790 if (!refType.isErroneous()) {
3791 refType = types.createMethodTypeWithReturn(refType,
3792 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3793 }
3794
3795 //go ahead with standard method reference compatibility check - note that param check
3796 //is a no-op (as this has been taken care during method applicability)
3797 boolean isSpeculativeRound =
3798 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3799
3800 that.type = currentTarget; //avoids recovery at this stage
3801 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3802 if (!isSpeculativeRound) {
3803 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3804 }
3805 chk.checkRequiresIdentity(that, localEnv.info.lint);
3806 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3807 } catch (Types.FunctionDescriptorLookupError ex) {
3808 JCDiagnostic cause = ex.getDiagnostic();
3809 resultInfo.checkContext.report(that, cause);
3810 result = that.type = types.createErrorType(pt());
3811 return;
3812 }
3813 }
3814 //where
3815 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3816 //if this is a constructor reference, the expected kind must be a type
3817 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3818 KindSelector.VAL_TYP : KindSelector.TYP,
3819 Type.noType);
3820 }
3821
3822
3823 @SuppressWarnings("fallthrough")
3824 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3825 InferenceContext inferenceContext = checkContext.inferenceContext();
3826 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3827
3828 Type resType;
3829 switch (tree.getMode()) {
3830 case NEW:
3831 if (!tree.expr.type.isRaw()) {
3832 resType = tree.expr.type;
3833 break;
3834 }
3835 default:
3836 resType = refType.getReturnType();
3837 }
3838
3839 Type incompatibleReturnType = resType;
3840
3841 if (returnType.hasTag(VOID)) {
3842 incompatibleReturnType = null;
3843 }
3844
3845 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3846 Type capturedResType = captureMRefReturnType ? types.capture(resType) : resType;
3847 if (resType.isErroneous() ||
3848 new FunctionalReturnContext(checkContext).compatible(capturedResType, returnType,
3849 checkContext.checkWarner(tree, capturedResType, returnType))) {
3850 incompatibleReturnType = null;
3851 }
3852 }
3853
3854 if (incompatibleReturnType != null) {
3855 Fragment msg =
3856 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3857 checkContext.report(tree, diags.fragment(msg));
3858 } else {
3859 if (inferenceContext.free(refType)) {
3860 // we need to wait for inference to finish and then replace inference vars in the referent type
3861 inferenceContext.addFreeTypeListener(List.of(refType),
3862 instantiatedContext -> {
3863 tree.referentType = instantiatedContext.asInstType(refType);
3864 });
3865 } else {
3866 tree.referentType = refType;
3867 }
3868 }
3869
3870 if (!speculativeAttr) {
3871 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3872 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3873 }
3874 }
3875 }
3876
3877 boolean checkExConstraints(
3878 List<Type> thrownByFuncExpr,
3879 List<Type> thrownAtFuncType,
3880 InferenceContext inferenceContext) {
3881 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3882 * are not proper types
3883 */
3884 List<Type> nonProperList = thrownAtFuncType.stream()
3885 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3886 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3887
3888 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3889 * in the throws clause of the invocation type of the method reference's compile-time
3890 * declaration
3891 */
3892 List<Type> checkedList = thrownByFuncExpr.stream()
3893 .filter(e -> chk.isChecked(e)).collect(List.collector());
3894
3895 /** If n = 0 (the function type's throws clause consists only of proper types), then
3896 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3897 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3898 * reduces to true
3899 */
3900 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3901 for (Type checked : checkedList) {
3902 boolean isSubtype = false;
3903 for (Type proper : properList) {
3904 if (types.isSubtype(checked, proper)) {
3905 isSubtype = true;
3906 break;
3907 }
3908 }
3909 if (!isSubtype) {
3910 uncaughtByProperTypes.add(checked);
3911 }
3912 }
3913
3914 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3915 return false;
3916 }
3917
3918 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3919 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3920 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3921 */
3922 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3923 uncaughtByProperTypes.forEach(checkedEx -> {
3924 nonProperAsUndet.forEach(nonProper -> {
3925 types.isSubtype(checkedEx, nonProper);
3926 });
3927 });
3928
3929 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3930 */
3931 nonProperAsUndet.stream()
3932 .filter(t -> t.hasTag(UNDETVAR))
3933 .forEach(t -> ((UndetVar)t).setThrow());
3934 return true;
3935 }
3936
3937 /**
3938 * Set functional type info on the underlying AST. Note: as the target descriptor
3939 * might contain inference variables, we might need to register an hook in the
3940 * current inference context.
3941 */
3942 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3943 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3944 if (checkContext.inferenceContext().free(descriptorType)) {
3945 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3946 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3947 inferenceContext.asInstType(primaryTarget), checkContext));
3948 } else {
3949 fExpr.owner = env.info.scope.owner;
3950 if (pt.hasTag(CLASS)) {
3951 fExpr.target = primaryTarget;
3952 }
3953 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3954 pt != Type.recoveryType) {
3955 //check that functional interface class is well-formed
3956 try {
3957 /* Types.makeFunctionalInterfaceClass() may throw an exception
3958 * when it's executed post-inference. See the listener code
3959 * above.
3960 */
3961 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3962 names.empty, fExpr.target, ABSTRACT);
3963 if (csym != null) {
3964 chk.checkImplementations(env.tree, csym, csym);
3965 try {
3966 //perform an additional functional interface check on the synthetic class,
3967 //as there may be spurious errors for raw targets - because of existing issues
3968 //with membership and inheritance (see JDK-8074570).
3969 csym.flags_field |= INTERFACE;
3970 types.findDescriptorType(csym.type);
3971 } catch (FunctionDescriptorLookupError err) {
3972 resultInfo.checkContext.report(fExpr,
3973 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3974 }
3975 }
3976 } catch (Types.FunctionDescriptorLookupError ex) {
3977 JCDiagnostic cause = ex.getDiagnostic();
3978 resultInfo.checkContext.report(env.tree, cause);
3979 }
3980 }
3981 }
3982 }
3983
3984 public void visitParens(JCParens tree) {
3985 Type owntype = attribTree(tree.expr, env, resultInfo);
3986 result = check(tree, owntype, pkind(), resultInfo);
3987 Symbol sym = TreeInfo.symbol(tree);
3988 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3989 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3990 }
3991
3992 public void visitAssign(JCAssign tree) {
3993 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3994 Type capturedType = capture(owntype);
3995 attribExpr(tree.rhs, env, owntype);
3996 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3997 }
3998
3999 public void visitAssignop(JCAssignOp tree) {
4000 // Attribute arguments.
4001 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4002 Type operand = attribExpr(tree.rhs, env);
4003 // Find operator.
4004 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4005 if (operator != operators.noOpSymbol &&
4006 !owntype.isErroneous() &&
4007 !operand.isErroneous()) {
4008 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4009 chk.checkCastable(tree.rhs.pos(),
4010 operator.type.getReturnType(),
4011 owntype);
4012 switch (tree.getTag()) {
4013 case SL_ASG, SR_ASG, USR_ASG -> { } // we only use (at most) the lower 6 bits, so any integral type is OK
4014 default -> chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4015 }
4016 chk.checkOutOfRangeShift(tree.rhs.pos(), operator, operand);
4017 }
4018 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4019 }
4020
4021 public void visitUnary(JCUnary tree) {
4022 // Attribute arguments.
4023 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4024 ? attribTree(tree.arg, env, varAssignmentInfo)
4025 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4026
4027 // Find operator.
4028 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4029 Type owntype = types.createErrorType(tree.type);
4030 if (operator != operators.noOpSymbol &&
4031 !argtype.isErroneous()) {
4032 owntype = (tree.getTag().isIncOrDecUnaryOp())
4033 ? tree.arg.type
4034 : operator.type.getReturnType();
4035 int opc = operator.opcode;
4036
4037 // If the argument is constant, fold it.
4038 if (argtype.constValue() != null) {
4039 Type ctype = cfolder.fold1(opc, argtype);
4040 if (ctype != null) {
4041 owntype = cfolder.coerce(ctype, owntype);
4042 }
4043 }
4044 }
4045 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4046 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4047 }
4048
4049 public void visitBinary(JCBinary tree) {
4050 // Attribute arguments.
4051 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4052 // x && y
4053 // include x's bindings when true in y
4054
4055 // x || y
4056 // include x's bindings when false in y
4057
4058 MatchBindings lhsBindings = matchBindings;
4059 List<BindingSymbol> propagatedBindings;
4060 switch (tree.getTag()) {
4061 case AND:
4062 propagatedBindings = lhsBindings.bindingsWhenTrue;
4063 break;
4064 case OR:
4065 propagatedBindings = lhsBindings.bindingsWhenFalse;
4066 break;
4067 default:
4068 propagatedBindings = List.nil();
4069 break;
4070 }
4071 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4072 Type right;
4073 try {
4074 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4075 } finally {
4076 rhsEnv.info.scope.leave();
4077 }
4078
4079 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4080
4081 // Find operator.
4082 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4083 Type owntype = types.createErrorType(tree.type);
4084 if (operator != operators.noOpSymbol &&
4085 !left.isErroneous() &&
4086 !right.isErroneous()) {
4087 owntype = operator.type.getReturnType();
4088 int opc = operator.opcode;
4089 // If both arguments are constants, fold them.
4090 if (left.constValue() != null && right.constValue() != null) {
4091 Type ctype = cfolder.fold2(opc, left, right);
4092 if (ctype != null) {
4093 owntype = cfolder.coerce(ctype, owntype);
4094 }
4095 }
4096
4097 // Check that argument types of a reference ==, != are
4098 // castable to each other, (JLS 15.21). Note: unboxing
4099 // comparisons will not have an acmp* opc at this point.
4100 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4101 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4102 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4103 }
4104 }
4105
4106 chk.checkDivZero(tree.rhs.pos(), operator, right);
4107 chk.checkOutOfRangeShift(tree.rhs.pos(), operator, right);
4108 }
4109 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4110 }
4111
4112 public void visitTypeCast(final JCTypeCast tree) {
4113 Type clazztype = attribType(tree.clazz, env);
4114 chk.validate(tree.clazz, env, false);
4115 chk.checkRequiresIdentity(tree, env.info.lint);
4116 //a fresh environment is required for 292 inference to work properly ---
4117 //see Infer.instantiatePolymorphicSignatureInstance()
4118 Env<AttrContext> localEnv = env.dup(tree);
4119 //should we propagate the target type?
4120 final ResultInfo castInfo;
4121 JCExpression expr = TreeInfo.skipParens(tree.expr);
4122 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4123 if (isPoly) {
4124 //expression is a poly - we need to propagate target type info
4125 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4126 new Check.NestedCheckContext(resultInfo.checkContext) {
4127 @Override
4128 public boolean compatible(Type found, Type req, Warner warn) {
4129 return types.isCastable(found, req, warn);
4130 }
4131 });
4132 } else {
4133 //standalone cast - target-type info is not propagated
4134 castInfo = unknownExprInfo;
4135 }
4136 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4137 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4138 if (exprtype.constValue() != null)
4139 owntype = cfolder.coerce(exprtype, owntype);
4140 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4141 if (!isPoly)
4142 chk.checkRedundantCast(localEnv, tree);
4143 }
4144
4145 public void visitTypeTest(JCInstanceOf tree) {
4146 Type exprtype = attribExpr(tree.expr, env);
4147 if (exprtype.isPrimitive()) {
4148 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4149 } else {
4150 exprtype = chk.checkNullOrRefType(
4151 tree.expr.pos(), exprtype);
4152 }
4153 Type clazztype;
4154 JCTree typeTree;
4155 if (tree.pattern.getTag() == BINDINGPATTERN ||
4156 tree.pattern.getTag() == RECORDPATTERN) {
4157 attribExpr(tree.pattern, env, exprtype);
4158 clazztype = tree.pattern.type;
4159 if (types.isSubtype(exprtype, clazztype) &&
4160 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4161 tree.pattern.getTag() != RECORDPATTERN) {
4162 if (!allowUnconditionalPatternsInstanceOf) {
4163 log.error(tree.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4164 }
4165 }
4166 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4167 } else {
4168 clazztype = attribType(tree.pattern, env);
4169 typeTree = tree.pattern;
4170 chk.validate(typeTree, env, false);
4171 }
4172 if (clazztype.isPrimitive()) {
4173 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4174 } else {
4175 if (!clazztype.hasTag(TYPEVAR)) {
4176 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4177 }
4178 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4179 boolean valid = false;
4180 if (allowReifiableTypesInInstanceof) {
4181 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4182 } else {
4183 log.error(tree.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4184 allowReifiableTypesInInstanceof = true;
4185 }
4186 if (!valid) {
4187 clazztype = types.createErrorType(clazztype);
4188 }
4189 }
4190 }
4191 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4192 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4193 }
4194
4195 private boolean checkCastablePattern(DiagnosticPosition pos,
4196 Type exprType,
4197 Type pattType) {
4198 Warner warner = new Warner();
4199 // if any type is erroneous, the problem is reported elsewhere
4200 if (exprType.isErroneous() || pattType.isErroneous()) {
4201 return false;
4202 }
4203 if (!types.isCastable(exprType, pattType, warner)) {
4204 chk.basicHandler.report(pos,
4205 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4206 return false;
4207 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4208 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4209 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4210 return true;
4211 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4212 log.error(pos,
4213 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4214 return false;
4215 } else {
4216 return true;
4217 }
4218 }
4219
4220 @Override
4221 public void visitAnyPattern(JCAnyPattern tree) {
4222 result = tree.type = resultInfo.pt;
4223 }
4224
4225 public void visitBindingPattern(JCBindingPattern tree) {
4226 Type type;
4227 if (!tree.var.isImplicitlyTyped()) {
4228 type = attribType(tree.var.vartype, env);
4229 } else {
4230 type = resultInfo.pt;
4231 }
4232 BindingSymbol v = new BindingSymbol(tree.var.mods.flags | tree.var.declKind.additionalSymbolFlags,
4233 tree.var.name, type, env.info.scope.owner);
4234 v.pos = tree.pos;
4235 tree.var.sym = v;
4236 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4237 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4238 }
4239 if (tree.var.isImplicitlyTyped()) {
4240 setupImplicitlyTypedVariable(tree.var, type == Type.noType ? syms.errType
4241 : type);
4242 }
4243 chk.validate(tree.var.vartype, env, true);
4244 annotate.annotateLater(tree.var.mods.annotations, env, v);
4245 if (!tree.var.isImplicitlyTyped()) {
4246 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v);
4247 }
4248 annotate.flush();
4249 typeAnnotations.organizeTypeAnnotationsSignaturesForLocalVarType(env, tree.var);
4250 result = tree.type = tree.var.type = v.type;
4251 if (v.isUnnamedVariable()) {
4252 matchBindings = MatchBindingsComputer.EMPTY;
4253 } else {
4254 matchBindings = new MatchBindings(List.of(v), List.nil());
4255 }
4256 chk.checkRequiresIdentity(tree, env.info.lint);
4257 }
4258
4259 @Override
4260 public void visitRecordPattern(JCRecordPattern tree) {
4261 Type site;
4262
4263 if (tree.deconstructor.hasTag(VARTYPE)) {
4264 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4265 tree.record = syms.errSymbol;
4266 site = tree.type = types.createErrorType(tree.record.type);
4267 } else {
4268 Type type = attribType(tree.deconstructor, env);
4269 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4270 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4271 if (inferred == null) {
4272 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4273 } else {
4274 type = inferred;
4275 }
4276 }
4277 tree.type = tree.deconstructor.type = type;
4278 site = types.capture(tree.type);
4279 chk.validate(tree.deconstructor, env, true);
4280 }
4281
4282 List<Type> expectedRecordTypes;
4283 if (site.tsym instanceof ClassSymbol clazz && clazz.isRecord()) {
4284 ClassSymbol record = (ClassSymbol) site.tsym;
4285 expectedRecordTypes = record.getRecordComponents()
4286 .stream()
4287 .map(rc -> types.memberType(site, rc))
4288 .map(t -> types.upward(t, types.captures(t)).baseType())
4289 .collect(List.collector());
4290 tree.record = record;
4291 } else {
4292 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4293 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4294 .limit(tree.nested.size())
4295 .collect(List.collector());
4296 tree.record = syms.errSymbol;
4297 }
4298 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4299 List<Type> recordTypes = expectedRecordTypes;
4300 List<JCPattern> nestedPatterns = tree.nested;
4301 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4302 try {
4303 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4304 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4305 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4306 outBindings.addAll(matchBindings.bindingsWhenTrue);
4307 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4308 nestedPatterns = nestedPatterns.tail;
4309 recordTypes = recordTypes.tail;
4310 }
4311 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4312 while (nestedPatterns.nonEmpty()) {
4313 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4314 nestedPatterns = nestedPatterns.tail;
4315 }
4316 List<Type> nestedTypes =
4317 tree.nested.stream().map(p -> p.type).collect(List.collector());
4318 log.error(tree.pos(),
4319 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4320 nestedTypes));
4321 }
4322 } finally {
4323 localEnv.info.scope.leave();
4324 }
4325 result = tree.type;
4326 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4327 }
4328
4329 public void visitIndexed(JCArrayAccess tree) {
4330 Type owntype = types.createErrorType(tree.type);
4331 Type atype = attribExpr(tree.indexed, env);
4332 attribExpr(tree.index, env, syms.intType);
4333 if (types.isArray(atype))
4334 owntype = types.elemtype(atype);
4335 else if (!atype.hasTag(ERROR))
4336 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4337 if (!pkind().contains(KindSelector.VAL))
4338 owntype = capture(owntype);
4339 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4340 }
4341
4342 public void visitIdent(JCIdent tree) {
4343 Symbol sym;
4344
4345 // Find symbol
4346 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4347 // If we are looking for a method, the prototype `pt' will be a
4348 // method type with the type of the call's arguments as parameters.
4349 env.info.pendingResolutionPhase = null;
4350 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4351 } else if (tree.sym != null && tree.sym.kind != VAR) {
4352 sym = tree.sym;
4353 } else {
4354 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4355 }
4356 tree.sym = sym;
4357
4358 // Also find the environment current for the class where
4359 // sym is defined (`symEnv').
4360 Env<AttrContext> symEnv = env;
4361 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4362 sym.kind.matches(KindSelector.VAL_MTH) &&
4363 sym.owner.kind == TYP &&
4364 tree.name != names._this && tree.name != names._super) {
4365
4366 // Find environment in which identifier is defined.
4367 while (symEnv.outer != null &&
4368 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4369 symEnv = symEnv.outer;
4370 }
4371 }
4372
4373 // If symbol is a variable, ...
4374 if (sym.kind == VAR) {
4375 VarSymbol v = (VarSymbol)sym;
4376
4377 // ..., evaluate its initializer, if it has one, and check for
4378 // illegal forward reference.
4379 checkInit(tree, env, v, false);
4380
4381 // If we are expecting a variable (as opposed to a value), check
4382 // that the variable is assignable in the current environment.
4383 if (KindSelector.ASG.subset(pkind()))
4384 checkAssignable(tree.pos(), v, null, env);
4385 }
4386
4387 Env<AttrContext> env1 = env;
4388 if (sym.kind != ERR && sym.kind != TYP &&
4389 sym.owner != null && sym.owner != env1.enclClass.sym) {
4390 // If the found symbol is inaccessible, then it is
4391 // accessed through an enclosing instance. Locate this
4392 // enclosing instance:
4393 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4394 env1 = env1.outer;
4395 }
4396
4397 if (env.info.isSerializable) {
4398 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4399 }
4400
4401 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4402 }
4403
4404 public void visitSelect(JCFieldAccess tree) {
4405 // Determine the expected kind of the qualifier expression.
4406 KindSelector skind = KindSelector.NIL;
4407 if (tree.name == names._this || tree.name == names._super ||
4408 tree.name == names._class)
4409 {
4410 skind = KindSelector.TYP;
4411 } else {
4412 if (pkind().contains(KindSelector.PCK))
4413 skind = KindSelector.of(skind, KindSelector.PCK);
4414 if (pkind().contains(KindSelector.TYP))
4415 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4416 if (pkind().contains(KindSelector.VAL_MTH))
4417 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4418 }
4419
4420 // Attribute the qualifier expression, and determine its symbol (if any).
4421 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4422 if (!pkind().contains(KindSelector.TYP_PCK))
4423 site = capture(site); // Capture field access
4424
4425 // don't allow T.class T[].class, etc
4426 if (skind == KindSelector.TYP) {
4427 Type elt = site;
4428 while (elt.hasTag(ARRAY))
4429 elt = ((ArrayType)elt).elemtype;
4430 if (elt.hasTag(TYPEVAR)) {
4431 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4432 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4433 tree.sym = tree.type.tsym;
4434 return ;
4435 }
4436 }
4437
4438 // If qualifier symbol is a type or `super', assert `selectSuper'
4439 // for the selection. This is relevant for determining whether
4440 // protected symbols are accessible.
4441 Symbol sitesym = TreeInfo.symbol(tree.selected);
4442 boolean selectSuperPrev = env.info.selectSuper;
4443 env.info.selectSuper =
4444 sitesym != null &&
4445 sitesym.name == names._super;
4446
4447 // Determine the symbol represented by the selection.
4448 env.info.pendingResolutionPhase = null;
4449 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4450 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4451 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4452 sym = syms.errSymbol;
4453 }
4454 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4455 site = capture(site);
4456 sym = selectSym(tree, sitesym, site, env, resultInfo);
4457 }
4458 boolean varArgs = env.info.lastResolveVarargs();
4459 tree.sym = sym;
4460
4461 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4462 site = types.skipTypeVars(site, true);
4463 }
4464
4465 // If that symbol is a variable, ...
4466 if (sym.kind == VAR) {
4467 VarSymbol v = (VarSymbol)sym;
4468
4469 // ..., evaluate its initializer, if it has one, and check for
4470 // illegal forward reference.
4471 checkInit(tree, env, v, true);
4472
4473 // If we are expecting a variable (as opposed to a value), check
4474 // that the variable is assignable in the current environment.
4475 if (KindSelector.ASG.subset(pkind()))
4476 checkAssignable(tree.pos(), v, tree.selected, env);
4477 }
4478
4479 if (sitesym != null &&
4480 sitesym.kind == VAR &&
4481 ((VarSymbol)sitesym).isResourceVariable() &&
4482 sym.kind == MTH &&
4483 sym.name.equals(names.close) &&
4484 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4485 log.warning(tree, LintWarnings.TryExplicitCloseCall);
4486 }
4487
4488 // Disallow selecting a type from an expression
4489 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4490 tree.type = check(tree.selected, pt(),
4491 sitesym == null ?
4492 KindSelector.VAL : sitesym.kind.toSelector(),
4493 new ResultInfo(KindSelector.TYP_PCK, pt()));
4494 }
4495
4496 if (isType(sitesym)) {
4497 if (sym.name != names._this && sym.name != names._super) {
4498 // Check if type-qualified fields or methods are static (JLS)
4499 if ((sym.flags() & STATIC) == 0 &&
4500 sym.name != names._super &&
4501 (sym.kind == VAR || sym.kind == MTH)) {
4502 rs.accessBase(rs.new StaticError(sym),
4503 tree.pos(), site, sym.name, true);
4504 }
4505 }
4506 } else if (sym.kind != ERR &&
4507 (sym.flags() & STATIC) != 0 &&
4508 sym.name != names._class) {
4509 // If the qualified item is not a type and the selected item is static, report
4510 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4511 if (!sym.owner.isAnonymous()) {
4512 log.warning(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4513 } else {
4514 log.warning(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4515 }
4516 }
4517
4518 // If we are selecting an instance member via a `super', ...
4519 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4520
4521 // Check that super-qualified symbols are not abstract (JLS)
4522 rs.checkNonAbstract(tree.pos(), sym);
4523
4524 if (site.isRaw()) {
4525 // Determine argument types for site.
4526 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4527 if (site1 != null) site = site1;
4528 }
4529 }
4530
4531 if (env.info.isSerializable) {
4532 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4533 }
4534
4535 env.info.selectSuper = selectSuperPrev;
4536 result = checkId(tree, site, sym, env, resultInfo);
4537 }
4538 //where
4539 /** Determine symbol referenced by a Select expression,
4540 *
4541 * @param tree The select tree.
4542 * @param site The type of the selected expression,
4543 * @param env The current environment.
4544 * @param resultInfo The current result.
4545 */
4546 private Symbol selectSym(JCFieldAccess tree,
4547 Symbol location,
4548 Type site,
4549 Env<AttrContext> env,
4550 ResultInfo resultInfo) {
4551 DiagnosticPosition pos = tree.pos();
4552 Name name = tree.name;
4553 switch (site.getTag()) {
4554 case PACKAGE:
4555 return rs.accessBase(
4556 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4557 pos, location, site, name, true);
4558 case ARRAY:
4559 case CLASS:
4560 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4561 return rs.resolveQualifiedMethod(
4562 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4563 } else if (name == names._this || name == names._super) {
4564 return rs.resolveSelf(pos, env, site.tsym, tree);
4565 } else if (name == names._class) {
4566 // In this case, we have already made sure in
4567 // visitSelect that qualifier expression is a type.
4568 return syms.getClassField(site, types);
4569 } else {
4570 // We are seeing a plain identifier as selector.
4571 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4572 sym = rs.accessBase(sym, pos, location, site, name, true);
4573 return sym;
4574 }
4575 case WILDCARD:
4576 throw new AssertionError(tree);
4577 case TYPEVAR:
4578 // Normally, site.getUpperBound() shouldn't be null.
4579 // It should only happen during memberEnter/attribBase
4580 // when determining the supertype which *must* be
4581 // done before attributing the type variables. In
4582 // other words, we are seeing this illegal program:
4583 // class B<T> extends A<T.foo> {}
4584 Symbol sym = (site.getUpperBound() != null)
4585 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4586 : null;
4587 if (sym == null) {
4588 log.error(pos, Errors.TypeVarCantBeDeref);
4589 return syms.errSymbol;
4590 } else {
4591 // JLS 4.9 specifies the members are derived by inheritance.
4592 // We skip inducing a whole class by filtering members that
4593 // can never be inherited:
4594 Symbol sym2;
4595 if (sym.isPrivate()) {
4596 // Private members
4597 sym2 = rs.new AccessError(env, site, sym);
4598 } else if (sym.owner.isInterface() && sym.kind == MTH && (sym.flags() & STATIC) != 0) {
4599 // Interface static methods
4600 sym2 = rs.new SymbolNotFoundError(ABSENT_MTH);
4601 } else {
4602 sym2 = sym;
4603 }
4604 rs.accessBase(sym2, pos, location, site, name, true);
4605 return sym;
4606 }
4607 case ERROR:
4608 // preserve identifier names through errors
4609 return types.createErrorType(name, site.tsym, site).tsym;
4610 default:
4611 // The qualifier expression is of a primitive type -- only
4612 // .class is allowed for these.
4613 if (name == names._class) {
4614 // In this case, we have already made sure in Select that
4615 // qualifier expression is a type.
4616 return syms.getClassField(site, types);
4617 } else {
4618 log.error(pos, Errors.CantDeref(site));
4619 return syms.errSymbol;
4620 }
4621 }
4622 }
4623
4624 /** Determine type of identifier or select expression and check that
4625 * (1) the referenced symbol is not deprecated
4626 * (2) the symbol's type is safe (@see checkSafe)
4627 * (3) if symbol is a variable, check that its type and kind are
4628 * compatible with the prototype and protokind.
4629 * (4) if symbol is an instance field of a raw type,
4630 * which is being assigned to, issue an unchecked warning if its
4631 * type changes under erasure.
4632 * (5) if symbol is an instance method of a raw type, issue an
4633 * unchecked warning if its argument types change under erasure.
4634 * If checks succeed:
4635 * If symbol is a constant, return its constant type
4636 * else if symbol is a method, return its result type
4637 * otherwise return its type.
4638 * Otherwise return errType.
4639 *
4640 * @param tree The syntax tree representing the identifier
4641 * @param site If this is a select, the type of the selected
4642 * expression, otherwise the type of the current class.
4643 * @param sym The symbol representing the identifier.
4644 * @param env The current environment.
4645 * @param resultInfo The expected result
4646 */
4647 Type checkId(JCTree tree,
4648 Type site,
4649 Symbol sym,
4650 Env<AttrContext> env,
4651 ResultInfo resultInfo) {
4652 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4653 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4654 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4655 }
4656
4657 Type checkMethodIdInternal(JCTree tree,
4658 Type site,
4659 Symbol sym,
4660 Env<AttrContext> env,
4661 ResultInfo resultInfo) {
4662 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4663 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4664 } else {
4665 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4666 }
4667 }
4668
4669 Type checkIdInternal(JCTree tree,
4670 Type site,
4671 Symbol sym,
4672 Type pt,
4673 Env<AttrContext> env,
4674 ResultInfo resultInfo) {
4675 Type owntype; // The computed type of this identifier occurrence.
4676 switch (sym.kind) {
4677 case TYP:
4678 // For types, the computed type equals the symbol's type,
4679 // except for two situations:
4680 owntype = sym.type;
4681 if (owntype.hasTag(CLASS)) {
4682 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4683 Type ownOuter = owntype.getEnclosingType();
4684
4685 // (a) If the symbol's type is parameterized, erase it
4686 // because no type parameters were given.
4687 // We recover generic outer type later in visitTypeApply.
4688 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4689 owntype = types.erasure(owntype);
4690 }
4691
4692 // (b) If the symbol's type is an inner class, then
4693 // we have to interpret its outer type as a superclass
4694 // of the site type. Example:
4695 //
4696 // class Tree<A> { class Visitor { ... } }
4697 // class PointTree extends Tree<Point> { ... }
4698 // ...PointTree.Visitor...
4699 //
4700 // Then the type of the last expression above is
4701 // Tree<Point>.Visitor.
4702 else if ((ownOuter.hasTag(CLASS) || ownOuter.hasTag(TYPEVAR)) && site != ownOuter) {
4703 Type normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4704 if (normOuter == null) // perhaps from an import
4705 normOuter = types.erasure(ownOuter);
4706 if (normOuter != ownOuter)
4707 owntype = new ClassType(
4708 normOuter, List.nil(), owntype.tsym,
4709 owntype.getMetadata());
4710 }
4711 }
4712 break;
4713 case VAR:
4714 VarSymbol v = (VarSymbol)sym;
4715
4716 if (env.info.enclVar != null
4717 && v.type.hasTag(NONE)) {
4718 //self reference to implicitly typed variable declaration
4719 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4720 return tree.type = v.type = types.createErrorType(v.type);
4721 }
4722
4723 // Test (4): if symbol is an instance field of a raw type,
4724 // which is being assigned to, issue an unchecked warning if
4725 // its type changes under erasure.
4726 if (KindSelector.ASG.subset(pkind()) &&
4727 v.owner.kind == TYP &&
4728 (v.flags() & STATIC) == 0 &&
4729 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4730 Type s = types.asOuterSuper(site, v.owner);
4731 if (s != null &&
4732 s.isRaw() &&
4733 !types.isSameType(v.type, v.erasure(types))) {
4734 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4735 }
4736 }
4737 // The computed type of a variable is the type of the
4738 // variable symbol, taken as a member of the site type.
4739 owntype = (sym.owner.kind == TYP &&
4740 sym.name != names._this && sym.name != names._super)
4741 ? types.memberType(site, sym)
4742 : sym.type;
4743
4744 // If the variable is a constant, record constant value in
4745 // computed type.
4746 if (v.getConstValue() != null && isStaticReference(tree))
4747 owntype = owntype.constType(v.getConstValue());
4748
4749 if (resultInfo.pkind == KindSelector.VAL) {
4750 owntype = capture(owntype); // capture "names as expressions"
4751 }
4752 break;
4753 case MTH: {
4754 owntype = checkMethod(site, sym,
4755 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4756 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4757 resultInfo.pt.getTypeArguments());
4758 chk.checkRestricted(tree.pos(), sym);
4759 break;
4760 }
4761 case PCK: case ERR:
4762 owntype = sym.type;
4763 break;
4764 default:
4765 throw new AssertionError("unexpected kind: " + sym.kind +
4766 " in tree " + tree);
4767 }
4768
4769 // Emit a `deprecation' warning if symbol is deprecated.
4770 // (for constructors (but not for constructor references), the error
4771 // was given when the constructor was resolved)
4772
4773 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4774 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4775 chk.checkSunAPI(tree.pos(), sym);
4776 chk.checkProfile(tree.pos(), sym);
4777 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4778 }
4779
4780 if (pt.isErroneous()) {
4781 owntype = types.createErrorType(owntype);
4782 }
4783
4784 // If symbol is a variable, check that its type and
4785 // kind are compatible with the prototype and protokind.
4786 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4787 }
4788
4789 /** Check that variable is initialized and evaluate the variable's
4790 * initializer, if not yet done. Also check that variable is not
4791 * referenced before it is defined.
4792 * @param tree The tree making up the variable reference.
4793 * @param env The current environment.
4794 * @param v The variable's symbol.
4795 */
4796 private void checkInit(JCTree tree,
4797 Env<AttrContext> env,
4798 VarSymbol v,
4799 boolean onlyWarning) {
4800 // A forward reference is diagnosed if the declaration position
4801 // of the variable is greater than the current tree position
4802 // and the tree and variable definition occur in the same class
4803 // definition. Note that writes don't count as references.
4804 // This check applies only to class and instance
4805 // variables. Local variables follow different scope rules,
4806 // and are subject to definite assignment checking.
4807 Env<AttrContext> initEnv = enclosingInitEnv(env);
4808 if (initEnv != null &&
4809 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4810 v.owner.kind == TYP &&
4811 v.owner == env.info.scope.owner.enclClass() &&
4812 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4813 (!env.tree.hasTag(ASSIGN) ||
4814 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4815 if (!onlyWarning || isStaticEnumField(v)) {
4816 Error errkey = (initEnv.info.enclVar == v) ?
4817 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4818 log.error(tree.pos(), errkey);
4819 } else if (useBeforeDeclarationWarning) {
4820 Warning warnkey = (initEnv.info.enclVar == v) ?
4821 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4822 log.warning(tree.pos(), warnkey);
4823 }
4824 }
4825
4826 v.getConstValue(); // ensure initializer is evaluated
4827
4828 checkEnumInitializer(tree, env, v);
4829 }
4830
4831 /**
4832 * Returns the enclosing init environment associated with this env (if any). An init env
4833 * can be either a field declaration env or a static/instance initializer env.
4834 */
4835 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4836 while (true) {
4837 switch (env.tree.getTag()) {
4838 case VARDEF:
4839 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4840 if (vdecl.sym.owner.kind == TYP) {
4841 //field
4842 return env;
4843 }
4844 break;
4845 case BLOCK:
4846 if (env.next.tree.hasTag(CLASSDEF)) {
4847 //instance/static initializer
4848 return env;
4849 }
4850 break;
4851 case METHODDEF:
4852 case CLASSDEF:
4853 case TOPLEVEL:
4854 return null;
4855 }
4856 Assert.checkNonNull(env.next);
4857 env = env.next;
4858 }
4859 }
4860
4861 /**
4862 * Check for illegal references to static members of enum. In
4863 * an enum type, constructors and initializers may not
4864 * reference its static members unless they are constant.
4865 *
4866 * @param tree The tree making up the variable reference.
4867 * @param env The current environment.
4868 * @param v The variable's symbol.
4869 * @jls 8.9 Enum Types
4870 */
4871 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4872 // JLS:
4873 //
4874 // "It is a compile-time error to reference a static field
4875 // of an enum type that is not a compile-time constant
4876 // (15.28) from constructors, instance initializer blocks,
4877 // or instance variable initializer expressions of that
4878 // type. It is a compile-time error for the constructors,
4879 // instance initializer blocks, or instance variable
4880 // initializer expressions of an enum constant e to refer
4881 // to itself or to an enum constant of the same type that
4882 // is declared to the right of e."
4883 if (isStaticEnumField(v)) {
4884 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4885
4886 if (enclClass == null || enclClass.owner == null)
4887 return;
4888
4889 // See if the enclosing class is the enum (or a
4890 // subclass thereof) declaring v. If not, this
4891 // reference is OK.
4892 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4893 return;
4894
4895 // If the reference isn't from an initializer, then
4896 // the reference is OK.
4897 if (!Resolve.isInitializer(env))
4898 return;
4899
4900 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4901 }
4902 }
4903
4904 /** Is the given symbol a static, non-constant field of an Enum?
4905 * Note: enum literals should not be regarded as such
4906 */
4907 private boolean isStaticEnumField(VarSymbol v) {
4908 return Flags.isEnum(v.owner) &&
4909 Flags.isStatic(v) &&
4910 !Flags.isConstant(v) &&
4911 v.name != names._class;
4912 }
4913
4914 /**
4915 * Check that method arguments conform to its instantiation.
4916 **/
4917 public Type checkMethod(Type site,
4918 final Symbol sym,
4919 ResultInfo resultInfo,
4920 Env<AttrContext> env,
4921 final List<JCExpression> argtrees,
4922 List<Type> argtypes,
4923 List<Type> typeargtypes) {
4924 // Test (5): if symbol is an instance method of a raw type, issue
4925 // an unchecked warning if its argument types change under erasure.
4926 if ((sym.flags() & STATIC) == 0 &&
4927 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4928 Type s = types.asOuterSuper(site, sym.owner);
4929 if (s != null && s.isRaw() &&
4930 !types.isSameTypes(sym.type.getParameterTypes(),
4931 sym.erasure(types).getParameterTypes())) {
4932 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
4933 }
4934 }
4935
4936 if (env.info.defaultSuperCallSite != null) {
4937 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4938 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4939 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4940 List<MethodSymbol> icand_sup =
4941 types.interfaceCandidates(sup, (MethodSymbol)sym);
4942 if (icand_sup.nonEmpty() &&
4943 icand_sup.head != sym &&
4944 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4945 log.error(env.tree.pos(),
4946 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4947 break;
4948 }
4949 }
4950 env.info.defaultSuperCallSite = null;
4951 }
4952
4953 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4954 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4955 if (app.meth.hasTag(SELECT) &&
4956 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4957 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4958 }
4959 }
4960
4961 // Compute the identifier's instantiated type.
4962 // For methods, we need to compute the instance type by
4963 // Resolve.instantiate from the symbol's type as well as
4964 // any type arguments and value arguments.
4965 Warner noteWarner = new Warner();
4966 try {
4967 Type owntype = rs.checkMethod(
4968 env,
4969 site,
4970 sym,
4971 resultInfo,
4972 argtypes,
4973 typeargtypes,
4974 noteWarner);
4975
4976 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4977 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4978
4979 argtypes = argtypes.map(checkDeferredMap);
4980
4981 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4982 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
4983 sym.name,
4984 rs.methodArguments(sym.type.getParameterTypes()),
4985 rs.methodArguments(argtypes.map(checkDeferredMap)),
4986 kindName(sym.location()),
4987 sym.location()));
4988 if (resultInfo.pt != Infer.anyPoly ||
4989 !owntype.hasTag(METHOD) ||
4990 !owntype.isPartial()) {
4991 //if this is not a partially inferred method type, erase return type. Otherwise,
4992 //erasure is carried out in PartiallyInferredMethodType.check().
4993 owntype = new MethodType(owntype.getParameterTypes(),
4994 types.erasure(owntype.getReturnType()),
4995 types.erasure(owntype.getThrownTypes()),
4996 syms.methodClass);
4997 }
4998 }
4999
5000 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5001 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5002 PolyKind.POLY : PolyKind.STANDALONE;
5003 TreeInfo.setPolyKind(env.tree, pkind);
5004
5005 return (resultInfo.pt == Infer.anyPoly) ?
5006 owntype :
5007 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5008 resultInfo.checkContext.inferenceContext());
5009 } catch (Infer.InferenceException ex) {
5010 //invalid target type - propagate exception outwards or report error
5011 //depending on the current check context
5012 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5013 return types.createErrorType(site);
5014 } catch (Resolve.InapplicableMethodException ex) {
5015 final JCDiagnostic diag = ex.getDiagnostic();
5016 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5017 @Override
5018 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5019 return new Pair<>(sym, diag);
5020 }
5021 };
5022 List<Type> argtypes2 = argtypes.map(
5023 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5024 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5025 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5026 log.report(errDiag);
5027 return types.createErrorType(site);
5028 }
5029 }
5030
5031 public void visitLiteral(JCLiteral tree) {
5032 result = check(tree, litType(tree.typetag).constType(tree.value),
5033 KindSelector.VAL, resultInfo);
5034 }
5035 //where
5036 /** Return the type of a literal with given type tag.
5037 */
5038 Type litType(TypeTag tag) {
5039 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5040 }
5041
5042 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5043 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5044 }
5045
5046 public void visitTypeArray(JCArrayTypeTree tree) {
5047 Type etype = attribType(tree.elemtype, env);
5048 Type type = new ArrayType(etype, syms.arrayClass);
5049 result = check(tree, type, KindSelector.TYP, resultInfo);
5050 }
5051
5052 /** Visitor method for parameterized types.
5053 * Bound checking is left until later, since types are attributed
5054 * before supertype structure is completely known
5055 */
5056 public void visitTypeApply(JCTypeApply tree) {
5057 Type owntype = types.createErrorType(tree.type);
5058
5059 // Attribute functor part of application and make sure it's a class.
5060 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5061
5062 // Attribute type parameters
5063 List<Type> actuals = attribTypes(tree.arguments, env);
5064
5065 if (clazztype.hasTag(CLASS)) {
5066 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5067 if (actuals.isEmpty()) //diamond
5068 actuals = formals;
5069
5070 if (actuals.length() == formals.length()) {
5071 List<Type> a = actuals;
5072 List<Type> f = formals;
5073 while (a.nonEmpty()) {
5074 a.head = a.head.withTypeVar(f.head);
5075 a = a.tail;
5076 f = f.tail;
5077 }
5078 // Compute the proper generic outer
5079 Type clazzOuter = clazztype.getEnclosingType();
5080 if (clazzOuter.hasTag(CLASS)) {
5081 Type site;
5082 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5083 if (clazz.hasTag(IDENT)) {
5084 site = env.enclClass.sym.type;
5085 } else if (clazz.hasTag(SELECT)) {
5086 site = ((JCFieldAccess) clazz).selected.type;
5087 } else throw new AssertionError(""+tree);
5088 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5089 if (site.hasTag(CLASS) || site.hasTag(TYPEVAR))
5090 site = types.asEnclosingSuper(site, clazzOuter.tsym);
5091 if (site == null)
5092 site = types.erasure(clazzOuter);
5093 clazzOuter = site;
5094 }
5095 }
5096 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5097 clazztype.getMetadata());
5098 } else {
5099 if (formals.length() != 0) {
5100 log.error(tree.pos(),
5101 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5102 } else {
5103 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5104 }
5105 owntype = types.createErrorType(tree.type);
5106 }
5107 } else if (clazztype.hasTag(ERROR)) {
5108 ErrorType parameterizedErroneous =
5109 new ErrorType(clazztype.getOriginalType(),
5110 clazztype.tsym,
5111 clazztype.getMetadata());
5112
5113 parameterizedErroneous.typarams_field = actuals;
5114 owntype = parameterizedErroneous;
5115 }
5116 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5117 }
5118
5119 public void visitTypeUnion(JCTypeUnion tree) {
5120 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5121 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5122 for (JCExpression typeTree : tree.alternatives) {
5123 Type ctype = attribType(typeTree, env);
5124 ctype = chk.checkType(typeTree.pos(),
5125 chk.checkClassType(typeTree.pos(), ctype),
5126 syms.throwableType);
5127 if (!ctype.isErroneous()) {
5128 //check that alternatives of a union type are pairwise
5129 //unrelated w.r.t. subtyping
5130 if (chk.intersects(ctype, multicatchTypes.toList())) {
5131 for (Type t : multicatchTypes) {
5132 boolean sub = types.isSubtype(ctype, t);
5133 boolean sup = types.isSubtype(t, ctype);
5134 if (sub || sup) {
5135 //assume 'a' <: 'b'
5136 Type a = sub ? ctype : t;
5137 Type b = sub ? t : ctype;
5138 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5139 }
5140 }
5141 }
5142 multicatchTypes.append(ctype);
5143 if (all_multicatchTypes != null)
5144 all_multicatchTypes.append(ctype);
5145 } else {
5146 if (all_multicatchTypes == null) {
5147 all_multicatchTypes = new ListBuffer<>();
5148 all_multicatchTypes.appendList(multicatchTypes);
5149 }
5150 all_multicatchTypes.append(ctype);
5151 }
5152 }
5153 Type t = check(tree, types.lub(multicatchTypes.toList()),
5154 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5155 if (t.hasTag(CLASS)) {
5156 List<Type> alternatives =
5157 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5158 t = new UnionClassType((ClassType) t, alternatives);
5159 }
5160 tree.type = result = t;
5161 }
5162
5163 public void visitTypeIntersection(JCTypeIntersection tree) {
5164 attribTypes(tree.bounds, env);
5165 tree.type = result = checkIntersection(tree, tree.bounds);
5166 }
5167
5168 public void visitTypeParameter(JCTypeParameter tree) {
5169 TypeVar typeVar = (TypeVar) tree.type;
5170
5171 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5172 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5173 }
5174
5175 if (!typeVar.getUpperBound().isErroneous()) {
5176 //fixup type-parameter bound computed in 'attribTypeVariables'
5177 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5178 }
5179 }
5180
5181 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5182 Set<Symbol> boundSet = new HashSet<>();
5183 if (bounds.nonEmpty()) {
5184 // accept class or interface or typevar as first bound.
5185 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5186 boundSet.add(types.erasure(bounds.head.type).tsym);
5187 if (bounds.head.type.isErroneous()) {
5188 return bounds.head.type;
5189 }
5190 else if (bounds.head.type.hasTag(TYPEVAR)) {
5191 // if first bound was a typevar, do not accept further bounds.
5192 if (bounds.tail.nonEmpty()) {
5193 log.error(bounds.tail.head.pos(),
5194 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5195 return bounds.head.type;
5196 }
5197 } else {
5198 // if first bound was a class or interface, accept only interfaces
5199 // as further bounds.
5200 for (JCExpression bound : bounds.tail) {
5201 bound.type = checkBase(bound.type, bound, env, false, true, false);
5202 if (bound.type.isErroneous()) {
5203 bounds = List.of(bound);
5204 }
5205 else if (bound.type.hasTag(CLASS)) {
5206 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5207 }
5208 }
5209 }
5210 }
5211
5212 if (bounds.length() == 0) {
5213 return syms.objectType;
5214 } else if (bounds.length() == 1) {
5215 return bounds.head.type;
5216 } else {
5217 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5218 // ... the variable's bound is a class type flagged COMPOUND
5219 // (see comment for TypeVar.bound).
5220 // In this case, generate a class tree that represents the
5221 // bound class, ...
5222 JCExpression extending;
5223 List<JCExpression> implementing;
5224 if (!bounds.head.type.isInterface()) {
5225 extending = bounds.head;
5226 implementing = bounds.tail;
5227 } else {
5228 extending = null;
5229 implementing = bounds;
5230 }
5231 JCClassDecl cd = make.at(tree).ClassDef(
5232 make.Modifiers(PUBLIC | ABSTRACT),
5233 names.empty, List.nil(),
5234 extending, implementing, List.nil());
5235
5236 ClassSymbol c = (ClassSymbol)owntype.tsym;
5237 Assert.check((c.flags() & COMPOUND) != 0);
5238 cd.sym = c;
5239 c.sourcefile = env.toplevel.sourcefile;
5240
5241 // ... and attribute the bound class
5242 c.flags_field |= UNATTRIBUTED;
5243 Env<AttrContext> cenv = enter.classEnv(cd, env);
5244 typeEnvs.put(c, cenv);
5245 attribClass(c);
5246 return owntype;
5247 }
5248 }
5249
5250 public void visitWildcard(JCWildcard tree) {
5251 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5252 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5253 ? syms.objectType
5254 : attribType(tree.inner, env);
5255 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5256 tree.kind.kind,
5257 syms.boundClass),
5258 KindSelector.TYP, resultInfo);
5259 }
5260
5261 public void visitAnnotation(JCAnnotation tree) {
5262 Assert.error("should be handled in annotate");
5263 }
5264
5265 @Override
5266 public void visitModifiers(JCModifiers tree) {
5267 //error recovery only:
5268 Assert.check(resultInfo.pkind == KindSelector.ERR);
5269
5270 attribAnnotationTypes(tree.annotations, env);
5271 }
5272
5273 public void visitAnnotatedType(JCAnnotatedType tree) {
5274 attribAnnotationTypes(tree.annotations, env);
5275 Type underlyingType = attribTree(tree.underlyingType, env, resultInfo);
5276 if (underlyingType.getTag() == PACKAGE) {
5277 result = tree.type = underlyingType;
5278 } else {
5279 Type annotatedType = underlyingType.preannotatedType();
5280
5281 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5282 result = tree.type = annotatedType;
5283 }
5284 }
5285
5286 public void visitErroneous(JCErroneous tree) {
5287 if (tree.errs != null) {
5288 WriteableScope newScope = env.info.scope;
5289
5290 if (env.tree instanceof JCClassDecl) {
5291 Symbol fakeOwner =
5292 new MethodSymbol(BLOCK, names.empty, null,
5293 env.info.scope.owner);
5294 newScope = newScope.dupUnshared(fakeOwner);
5295 }
5296
5297 Env<AttrContext> errEnv =
5298 env.dup(env.tree,
5299 env.info.dup(newScope));
5300 errEnv.info.returnResult = unknownExprInfo;
5301 for (JCTree err : tree.errs)
5302 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5303 }
5304 result = tree.type = syms.errType;
5305 }
5306
5307 /** Default visitor method for all other trees.
5308 */
5309 public void visitTree(JCTree tree) {
5310 throw new AssertionError();
5311 }
5312
5313 /**
5314 * Attribute an env for either a top level tree or class or module declaration.
5315 */
5316 public void attrib(Env<AttrContext> env) {
5317 switch (env.tree.getTag()) {
5318 case MODULEDEF:
5319 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5320 break;
5321 case PACKAGEDEF:
5322 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5323 break;
5324 default:
5325 attribClass(env.tree.pos(), env.enclClass.sym);
5326 }
5327
5328 annotate.flush();
5329
5330 // Now that this tree is attributed, we can calculate the Lint configuration everywhere within it
5331 lintMapper.calculateLints(env.toplevel.sourcefile, env.tree);
5332 }
5333
5334 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5335 try {
5336 annotate.flush();
5337 attribPackage(p);
5338 } catch (CompletionFailure ex) {
5339 chk.completionError(pos, ex);
5340 }
5341 }
5342
5343 void attribPackage(PackageSymbol p) {
5344 attribWithLint(p,
5345 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5346 }
5347
5348 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5349 try {
5350 annotate.flush();
5351 attribModule(m);
5352 } catch (CompletionFailure ex) {
5353 chk.completionError(pos, ex);
5354 }
5355 }
5356
5357 void attribModule(ModuleSymbol m) {
5358 attribWithLint(m, env -> attribStat(env.tree, env));
5359 }
5360
5361 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5362 Env<AttrContext> env = typeEnvs.get(sym);
5363
5364 Env<AttrContext> lintEnv = env;
5365 while (lintEnv.info.lint == null)
5366 lintEnv = lintEnv.next;
5367
5368 Lint lint = lintEnv.info.lint.augment(sym);
5369
5370 Lint prevLint = chk.setLint(lint);
5371 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5372
5373 try {
5374 attrib.accept(env);
5375 } finally {
5376 log.useSource(prev);
5377 chk.setLint(prevLint);
5378 }
5379 }
5380
5381 /** Main method: attribute class definition associated with given class symbol.
5382 * reporting completion failures at the given position.
5383 * @param pos The source position at which completion errors are to be
5384 * reported.
5385 * @param c The class symbol whose definition will be attributed.
5386 */
5387 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5388 try {
5389 annotate.flush();
5390 attribClass(c);
5391 } catch (CompletionFailure ex) {
5392 chk.completionError(pos, ex);
5393 }
5394 }
5395
5396 /** Attribute class definition associated with given class symbol.
5397 * @param c The class symbol whose definition will be attributed.
5398 */
5399 void attribClass(ClassSymbol c) throws CompletionFailure {
5400 if (c.type.hasTag(ERROR)) return;
5401
5402 // Check for cycles in the inheritance graph, which can arise from
5403 // ill-formed class files.
5404 chk.checkNonCyclic(null, c.type);
5405
5406 Type st = types.supertype(c.type);
5407 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5408 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0 &&
5409 breakTree == null) {
5410 // First, attribute superclass.
5411 if (st.hasTag(CLASS))
5412 attribClass((ClassSymbol)st.tsym);
5413
5414 // Next attribute owner, if it is a class.
5415 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5416 attribClass((ClassSymbol)c.owner);
5417
5418 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5419 }
5420
5421 // The previous operations might have attributed the current class
5422 // if there was a cycle. So we test first whether the class is still
5423 // UNATTRIBUTED.
5424 if ((c.flags_field & UNATTRIBUTED) != 0) {
5425 c.flags_field &= ~UNATTRIBUTED;
5426
5427 // Get environment current at the point of class definition.
5428 Env<AttrContext> env = typeEnvs.get(c);
5429
5430 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5431 // because the annotations were not available at the time the env was created. Therefore,
5432 // we look up the environment chain for the first enclosing environment for which the
5433 // lint value is set. Typically, this is the parent env, but might be further if there
5434 // are any envs created as a result of TypeParameter nodes.
5435 Env<AttrContext> lintEnv = env;
5436 while (lintEnv.info.lint == null)
5437 lintEnv = lintEnv.next;
5438
5439 // Having found the enclosing lint value, we can initialize the lint value for this class
5440 env.info.lint = lintEnv.info.lint.augment(c);
5441
5442 Lint prevLint = chk.setLint(env.info.lint);
5443 JavaFileObject prev = log.useSource(c.sourcefile);
5444 ResultInfo prevReturnRes = env.info.returnResult;
5445
5446 try {
5447 if (c.isSealed() &&
5448 !c.isEnum() &&
5449 !c.isPermittedExplicit &&
5450 c.getPermittedSubclasses().isEmpty()) {
5451 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5452 }
5453
5454 if (c.isSealed()) {
5455 Set<Symbol> permittedTypes = new HashSet<>();
5456 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5457 for (Type subType : c.getPermittedSubclasses()) {
5458 if (subType.isErroneous()) {
5459 // the type already caused errors, don't produce more potentially misleading errors
5460 continue;
5461 }
5462 boolean isTypeVar = false;
5463 if (subType.getTag() == TYPEVAR) {
5464 isTypeVar = true; //error recovery
5465 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5466 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5467 }
5468 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5469 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5470 }
5471 if (permittedTypes.contains(subType.tsym)) {
5472 DiagnosticPosition pos =
5473 env.enclClass.permitting.stream()
5474 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5475 .limit(2).collect(List.collector()).get(1);
5476 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5477 } else {
5478 permittedTypes.add(subType.tsym);
5479 }
5480 if (sealedInUnnamed) {
5481 if (subType.tsym.packge() != c.packge()) {
5482 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5483 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5484 );
5485 }
5486 } else if (subType.tsym.packge().modle != c.packge().modle) {
5487 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5488 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5489 );
5490 }
5491 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5492 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5493 Errors.InvalidPermitsClause(
5494 subType.tsym == c.type.tsym ?
5495 Fragments.MustNotBeSameClass :
5496 Fragments.MustNotBeSupertype(subType)
5497 )
5498 );
5499 } else if (!isTypeVar) {
5500 boolean thisIsASuper = types.directSupertypes(subType)
5501 .stream()
5502 .anyMatch(d -> d.tsym == c);
5503 if (!thisIsASuper) {
5504 if(c.isInterface()) {
5505 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5506 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5507 } else {
5508 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5509 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5510 }
5511 }
5512 }
5513 }
5514 }
5515
5516 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5517 .stream()
5518 .filter(s -> s.tsym.isSealed())
5519 .map(s -> (ClassSymbol) s.tsym)
5520 .collect(List.collector());
5521
5522 if (sealedSupers.isEmpty()) {
5523 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5524 boolean hasErrorSuper = false;
5525
5526 hasErrorSuper |= types.directSupertypes(c.type)
5527 .stream()
5528 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5529
5530 ClassType ct = (ClassType) c.type;
5531
5532 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5533
5534 if (!hasErrorSuper) {
5535 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5536 }
5537 }
5538 } else {
5539 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5540 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5541 }
5542
5543 if (!c.type.isCompound()) {
5544 for (ClassSymbol supertypeSym : sealedSupers) {
5545 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5546 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5547 }
5548 }
5549 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5550 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5551 c.isInterface() ?
5552 Errors.NonSealedOrSealedExpected :
5553 Errors.NonSealedSealedOrFinalExpected);
5554 }
5555 }
5556 }
5557
5558 env.info.returnResult = null;
5559 // java.lang.Enum may not be subclassed by a non-enum
5560 if (st.tsym == syms.enumSym &&
5561 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5562 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5563
5564 // Enums may not be extended by source-level classes
5565 if (st.tsym != null &&
5566 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5567 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5568 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5569 }
5570
5571 if (rs.isSerializable(c.type)) {
5572 env.info.isSerializable = true;
5573 }
5574
5575 attribClassBody(env, c);
5576
5577 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5578 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5579 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5580 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5581
5582 if (c.isImplicit()) {
5583 chk.checkHasMain(env.tree.pos(), c);
5584 }
5585 } finally {
5586 env.info.returnResult = prevReturnRes;
5587 log.useSource(prev);
5588 chk.setLint(prevLint);
5589 }
5590
5591 }
5592 }
5593
5594 public void visitImport(JCImport tree) {
5595 // nothing to do
5596 }
5597
5598 public void visitModuleDef(JCModuleDecl tree) {
5599 tree.sym.completeUsesProvides();
5600 ModuleSymbol msym = tree.sym;
5601 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5602 Lint prevLint = chk.setLint(lint);
5603 try {
5604 chk.checkModuleName(tree);
5605 chk.checkDeprecatedAnnotation(tree, msym);
5606 } finally {
5607 chk.setLint(prevLint);
5608 }
5609 }
5610
5611 /** Finish the attribution of a class. */
5612 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5613 JCClassDecl tree = (JCClassDecl)env.tree;
5614 Assert.check(c == tree.sym);
5615
5616 // Validate type parameters, supertype and interfaces.
5617 attribStats(tree.typarams, env);
5618 if (!c.isAnonymous()) {
5619 //already checked if anonymous
5620 chk.validate(tree.typarams, env);
5621 chk.validate(tree.extending, env);
5622 chk.validate(tree.implementing, env);
5623 }
5624
5625 chk.checkRequiresIdentity(tree, env.info.lint);
5626
5627 c.markAbstractIfNeeded(types);
5628
5629 // If this is a non-abstract class, check that it has no abstract
5630 // methods or unimplemented methods of an implemented interface.
5631 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5632 chk.checkAllDefined(tree.pos(), c);
5633 }
5634
5635 if ((c.flags() & ANNOTATION) != 0) {
5636 if (tree.implementing.nonEmpty())
5637 log.error(tree.implementing.head.pos(),
5638 Errors.CantExtendIntfAnnotation);
5639 if (tree.typarams.nonEmpty()) {
5640 log.error(tree.typarams.head.pos(),
5641 Errors.IntfAnnotationCantHaveTypeParams(c));
5642 }
5643
5644 // If this annotation type has a @Repeatable, validate
5645 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5646 // If this annotation type has a @Repeatable, validate
5647 if (repeatable != null) {
5648 // get diagnostic position for error reporting
5649 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5650 Assert.checkNonNull(cbPos);
5651
5652 chk.validateRepeatable(c, repeatable, cbPos);
5653 }
5654 } else {
5655 try {
5656 // Check that all extended classes and interfaces
5657 // are compatible (i.e. no two define methods with same arguments
5658 // yet different return types). (JLS 8.4.8.3)
5659 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5660 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5661 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5662 } catch (CompletionFailure cf) {
5663 chk.completionError(tree.pos(), cf);
5664 }
5665 }
5666
5667 // Check that class does not import the same parameterized interface
5668 // with two different argument lists.
5669 chk.checkClassBounds(tree.pos(), c.type);
5670
5671 tree.type = c.type;
5672
5673 for (List<JCTypeParameter> l = tree.typarams;
5674 l.nonEmpty(); l = l.tail) {
5675 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5676 }
5677
5678 // Check that a generic class doesn't extend Throwable
5679 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5680 log.error(tree.extending.pos(), Errors.GenericThrowable);
5681
5682 // Check that all methods which implement some
5683 // method conform to the method they implement.
5684 chk.checkImplementations(tree);
5685
5686 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5687 checkAutoCloseable(env, tree, false);
5688
5689 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5690 // Attribute declaration
5691 attribStat(l.head, env);
5692 // Check that declarations in inner classes are not static (JLS 8.1.2)
5693 // Make an exception for static constants.
5694 if (!allowRecords &&
5695 c.owner.kind != PCK &&
5696 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5697 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5698 VarSymbol sym = null;
5699 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5700 if (sym == null ||
5701 sym.kind != VAR ||
5702 sym.getConstValue() == null)
5703 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5704 }
5705 }
5706
5707 // Check for proper placement of super()/this() calls.
5708 chk.checkSuperInitCalls(tree);
5709
5710 // Check for cycles among non-initial constructors.
5711 chk.checkCyclicConstructors(tree);
5712
5713 // Check for cycles among annotation elements.
5714 chk.checkNonCyclicElements(tree);
5715
5716 // Check for proper use of serialVersionUID and other
5717 // serialization-related fields and methods
5718 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5719 && rs.isSerializable(c.type)
5720 && !c.isAnonymous()) {
5721 chk.checkSerialStructure(tree, c);
5722 }
5723 // Correctly organize the positions of the type annotations
5724 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5725
5726 // Check type annotations applicability rules
5727 validateTypeAnnotations(tree, false);
5728 }
5729 // where
5730 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5731 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5732 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5733 if (types.isSameType(al.head.annotationType.type, t))
5734 return al.head.pos();
5735 }
5736
5737 return null;
5738 }
5739
5740 private Type capture(Type type) {
5741 return types.capture(type);
5742 }
5743
5744 private void setupImplicitlyTypedVariable(JCVariableDecl tree, Type type) {
5745 Assert.check(tree.isImplicitlyTyped());
5746
5747 type.complete();
5748
5749 if (tree.vartype == null) {
5750 return ;
5751 }
5752
5753 Assert.check(tree.vartype.hasTag(VARTYPE));
5754
5755 JCVarType vartype = (JCVarType) tree.vartype;
5756
5757 vartype.type = type;
5758 }
5759
5760 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5761 tree.accept(new TypeAnnotationsValidator(sigOnly));
5762 }
5763 //where
5764 private final class TypeAnnotationsValidator extends TreeScanner {
5765
5766 private final boolean sigOnly;
5767 public TypeAnnotationsValidator(boolean sigOnly) {
5768 this.sigOnly = sigOnly;
5769 }
5770
5771 public void visitAnnotation(JCAnnotation tree) {
5772 chk.validateTypeAnnotation(tree, null, false);
5773 super.visitAnnotation(tree);
5774 }
5775 public void visitAnnotatedType(JCAnnotatedType tree) {
5776 if (!tree.underlyingType.type.isErroneous()) {
5777 super.visitAnnotatedType(tree);
5778 }
5779 }
5780 public void visitTypeParameter(JCTypeParameter tree) {
5781 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5782 scan(tree.bounds);
5783 // Don't call super.
5784 // This is needed because above we call validateTypeAnnotation with
5785 // false, which would forbid annotations on type parameters.
5786 // super.visitTypeParameter(tree);
5787 }
5788 public void visitMethodDef(JCMethodDecl tree) {
5789 if (tree.recvparam != null &&
5790 !tree.recvparam.vartype.type.isErroneous()) {
5791 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5792 }
5793 if (tree.restype != null && tree.restype.type != null) {
5794 validateAnnotatedType(tree.restype, tree.restype.type);
5795 }
5796 if (sigOnly) {
5797 scan(tree.mods);
5798 scan(tree.restype);
5799 scan(tree.typarams);
5800 scan(tree.recvparam);
5801 scan(tree.params);
5802 scan(tree.thrown);
5803 } else {
5804 scan(tree.defaultValue);
5805 scan(tree.body);
5806 }
5807 }
5808 public void visitVarDef(final JCVariableDecl tree) {
5809 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5810 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5811 validateAnnotatedType(tree.vartype, tree.sym.type);
5812 scan(tree.mods);
5813 scan(tree.vartype);
5814 if (!sigOnly) {
5815 scan(tree.init);
5816 }
5817 }
5818 public void visitTypeCast(JCTypeCast tree) {
5819 if (tree.clazz != null && tree.clazz.type != null)
5820 validateAnnotatedType(tree.clazz, tree.clazz.type);
5821 super.visitTypeCast(tree);
5822 }
5823 public void visitTypeTest(JCInstanceOf tree) {
5824 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5825 validateAnnotatedType(tree.pattern, tree.pattern.type);
5826 super.visitTypeTest(tree);
5827 }
5828 public void visitNewClass(JCNewClass tree) {
5829 if (tree.clazz != null && tree.clazz.type != null) {
5830 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5831 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5832 tree.clazz.type.tsym);
5833 }
5834 if (tree.def != null) {
5835 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5836 }
5837
5838 validateAnnotatedType(tree.clazz, tree.clazz.type);
5839 }
5840 super.visitNewClass(tree);
5841 }
5842 public void visitNewArray(JCNewArray tree) {
5843 if (tree.elemtype != null && tree.elemtype.type != null) {
5844 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5845 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5846 tree.elemtype.type.tsym);
5847 }
5848 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5849 }
5850 super.visitNewArray(tree);
5851 }
5852 public void visitClassDef(JCClassDecl tree) {
5853 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5854 if (sigOnly) {
5855 scan(tree.mods);
5856 scan(tree.typarams);
5857 scan(tree.extending);
5858 scan(tree.implementing);
5859 }
5860 for (JCTree member : tree.defs) {
5861 if (member.hasTag(Tag.CLASSDEF)) {
5862 continue;
5863 }
5864 scan(member);
5865 }
5866 }
5867 public void visitBlock(JCBlock tree) {
5868 if (!sigOnly) {
5869 scan(tree.stats);
5870 }
5871 }
5872
5873 /* I would want to model this after
5874 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5875 * and override visitSelect and visitTypeApply.
5876 * However, we only set the annotated type in the top-level type
5877 * of the symbol.
5878 * Therefore, we need to override each individual location where a type
5879 * can occur.
5880 */
5881 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5882 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5883
5884 if (type.isPrimitiveOrVoid()) {
5885 return;
5886 }
5887
5888 JCTree enclTr = errtree;
5889 Type enclTy = type;
5890
5891 boolean repeat = true;
5892 while (repeat) {
5893 if (enclTr.hasTag(TYPEAPPLY)) {
5894 List<Type> tyargs = enclTy.getTypeArguments();
5895 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5896 if (trargs.length() > 0) {
5897 // Nothing to do for diamonds
5898 if (tyargs.length() == trargs.length()) {
5899 for (int i = 0; i < tyargs.length(); ++i) {
5900 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5901 }
5902 }
5903 // If the lengths don't match, it's either a diamond
5904 // or some nested type that redundantly provides
5905 // type arguments in the tree.
5906 }
5907
5908 // Look at the clazz part of a generic type
5909 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5910 }
5911
5912 if (enclTr.hasTag(SELECT)) {
5913 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5914 if (enclTy != null &&
5915 !enclTy.hasTag(NONE)) {
5916 enclTy = enclTy.getEnclosingType();
5917 }
5918 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5919 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5920 if (enclTy == null || enclTy.hasTag(NONE)) {
5921 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5922 for (JCAnnotation an : at.getAnnotations()) {
5923 if (chk.isTypeAnnotation(an, false)) {
5924 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5925 }
5926 }
5927 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5928 if (!onlyTypeAnnotations.isEmpty()) {
5929 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5930 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5931 Fragments.TypeAnnotation(onlyTypeAnnotations);
5932 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5933 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5934 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5935 type.tsym.owner, annotatedType));
5936 }
5937 repeat = false;
5938 }
5939 enclTr = at.underlyingType;
5940 // enclTy doesn't need to be changed
5941 } else if (enclTr.hasTag(IDENT)) {
5942 repeat = false;
5943 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5944 JCWildcard wc = (JCWildcard) enclTr;
5945 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5946 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5947 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5948 } else {
5949 // Nothing to do for UNBOUND
5950 }
5951 repeat = false;
5952 } else if (enclTr.hasTag(TYPEARRAY)) {
5953 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5954 validateAnnotatedType(art.getType(), art.elemtype.type);
5955 repeat = false;
5956 } else if (enclTr.hasTag(TYPEUNION)) {
5957 JCTypeUnion ut = (JCTypeUnion) enclTr;
5958 for (JCTree t : ut.getTypeAlternatives()) {
5959 validateAnnotatedType(t, t.type);
5960 }
5961 repeat = false;
5962 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5963 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5964 for (JCTree t : it.getBounds()) {
5965 validateAnnotatedType(t, t.type);
5966 }
5967 repeat = false;
5968 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5969 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5970 repeat = false;
5971 } else {
5972 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5973 " within: "+ errtree + " with kind: " + errtree.getKind());
5974 }
5975 }
5976 }
5977
5978 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5979 Symbol sym) {
5980 // Ensure that no declaration annotations are present.
5981 // Note that a tree type might be an AnnotatedType with
5982 // empty annotations, if only declaration annotations were given.
5983 // This method will raise an error for such a type.
5984 for (JCAnnotation ai : annotations) {
5985 if (!ai.type.isErroneous() &&
5986 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5987 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5988 }
5989 }
5990 }
5991 }
5992
5993 // <editor-fold desc="post-attribution visitor">
5994
5995 /**
5996 * Handle missing types/symbols in an AST. This routine is useful when
5997 * the compiler has encountered some errors (which might have ended up
5998 * terminating attribution abruptly); if the compiler is used in fail-over
5999 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6000 * prevents NPE to be propagated during subsequent compilation steps.
6001 */
6002 public void postAttr(JCTree tree) {
6003 new PostAttrAnalyzer().scan(tree);
6004 }
6005
6006 class PostAttrAnalyzer extends TreeScanner {
6007
6008 private void initTypeIfNeeded(JCTree that) {
6009 if (that.type == null) {
6010 if (that.hasTag(METHODDEF)) {
6011 that.type = dummyMethodType((JCMethodDecl)that);
6012 } else {
6013 that.type = syms.unknownType;
6014 }
6015 }
6016 }
6017
6018 /* Construct a dummy method type. If we have a method declaration,
6019 * and the declared return type is void, then use that return type
6020 * instead of UNKNOWN to avoid spurious error messages in lambda
6021 * bodies (see:JDK-8041704).
6022 */
6023 private Type dummyMethodType(JCMethodDecl md) {
6024 Type restype = syms.unknownType;
6025 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6026 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6027 if (prim.typetag == VOID)
6028 restype = syms.voidType;
6029 }
6030 return new MethodType(List.nil(), restype,
6031 List.nil(), syms.methodClass);
6032 }
6033 private Type dummyMethodType() {
6034 return dummyMethodType(null);
6035 }
6036
6037 @Override
6038 public void scan(JCTree tree) {
6039 if (tree == null) return;
6040 if (tree instanceof JCExpression) {
6041 initTypeIfNeeded(tree);
6042 }
6043 super.scan(tree);
6044 }
6045
6046 @Override
6047 public void visitIdent(JCIdent that) {
6048 if (that.sym == null) {
6049 that.sym = syms.unknownSymbol;
6050 }
6051 }
6052
6053 @Override
6054 public void visitSelect(JCFieldAccess that) {
6055 if (that.sym == null) {
6056 that.sym = syms.unknownSymbol;
6057 }
6058 super.visitSelect(that);
6059 }
6060
6061 @Override
6062 public void visitClassDef(JCClassDecl that) {
6063 initTypeIfNeeded(that);
6064 if (that.sym == null) {
6065 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6066 }
6067 super.visitClassDef(that);
6068 }
6069
6070 @Override
6071 public void visitMethodDef(JCMethodDecl that) {
6072 initTypeIfNeeded(that);
6073 if (that.sym == null) {
6074 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6075 }
6076 super.visitMethodDef(that);
6077 }
6078
6079 @Override
6080 public void visitVarDef(JCVariableDecl that) {
6081 initTypeIfNeeded(that);
6082 if (that.sym == null) {
6083 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6084 that.sym.adr = 0;
6085 }
6086 super.visitVarDef(that);
6087 }
6088
6089 @Override
6090 public void visitBindingPattern(JCBindingPattern that) {
6091 initTypeIfNeeded(that);
6092 initTypeIfNeeded(that.var);
6093 if (that.var.sym == null) {
6094 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6095 that.var.sym.adr = 0;
6096 }
6097 super.visitBindingPattern(that);
6098 }
6099
6100 @Override
6101 public void visitRecordPattern(JCRecordPattern that) {
6102 initTypeIfNeeded(that);
6103 if (that.record == null) {
6104 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6105 that.type, syms.noSymbol);
6106 }
6107 if (that.fullComponentTypes == null) {
6108 that.fullComponentTypes = List.nil();
6109 }
6110 super.visitRecordPattern(that);
6111 }
6112
6113 @Override
6114 public void visitNewClass(JCNewClass that) {
6115 if (that.constructor == null) {
6116 that.constructor = new MethodSymbol(0, names.init,
6117 dummyMethodType(), syms.noSymbol);
6118 }
6119 if (that.constructorType == null) {
6120 that.constructorType = syms.unknownType;
6121 }
6122 super.visitNewClass(that);
6123 }
6124
6125 @Override
6126 public void visitAssignop(JCAssignOp that) {
6127 if (that.operator == null) {
6128 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6129 -1, syms.noSymbol);
6130 }
6131 super.visitAssignop(that);
6132 }
6133
6134 @Override
6135 public void visitBinary(JCBinary that) {
6136 if (that.operator == null) {
6137 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6138 -1, syms.noSymbol);
6139 }
6140 super.visitBinary(that);
6141 }
6142
6143 @Override
6144 public void visitUnary(JCUnary that) {
6145 if (that.operator == null) {
6146 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6147 -1, syms.noSymbol);
6148 }
6149 super.visitUnary(that);
6150 }
6151
6152 @Override
6153 public void visitReference(JCMemberReference that) {
6154 super.visitReference(that);
6155 if (that.sym == null) {
6156 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6157 syms.noSymbol);
6158 }
6159 }
6160
6161 @Override
6162 public void visitVarType(JCVarType that) {
6163 initTypeIfNeeded(that);
6164 }
6165 }
6166 // </editor-fold>
6167
6168 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6169 new TreeScanner() {
6170 Symbol packge = pkg;
6171 @Override
6172 public void visitIdent(JCIdent that) {
6173 that.sym = packge;
6174 }
6175
6176 @Override
6177 public void visitSelect(JCFieldAccess that) {
6178 that.sym = packge;
6179 packge = packge.owner;
6180 super.visitSelect(that);
6181 }
6182 }.scan(pid);
6183 }
6184
6185 }