1 /*
2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
62 import com.sun.tools.javac.tree.*;
63 import com.sun.tools.javac.tree.JCTree.*;
64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
65 import com.sun.tools.javac.util.*;
66 import com.sun.tools.javac.util.DefinedBy.Api;
67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
68 import com.sun.tools.javac.util.JCDiagnostic.Error;
69 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
70 import com.sun.tools.javac.util.JCDiagnostic.Warning;
71 import com.sun.tools.javac.util.List;
72
73 import static com.sun.tools.javac.code.Flags.*;
74 import static com.sun.tools.javac.code.Flags.ANNOTATION;
75 import static com.sun.tools.javac.code.Flags.BLOCK;
76 import static com.sun.tools.javac.code.Kinds.*;
77 import static com.sun.tools.javac.code.Kinds.Kind.*;
78 import static com.sun.tools.javac.code.TypeTag.*;
79 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
80 import static com.sun.tools.javac.tree.JCTree.Tag.*;
81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
82
83 /** This is the main context-dependent analysis phase in GJC. It
84 * encompasses name resolution, type checking and constant folding as
85 * subtasks. Some subtasks involve auxiliary classes.
86 * @see Check
87 * @see Resolve
88 * @see ConstFold
89 * @see Infer
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public class Attr extends JCTree.Visitor {
97 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
98
99 final Names names;
100 final Log log;
101 final Symtab syms;
102 final Resolve rs;
103 final Operators operators;
104 final Infer infer;
105 final Analyzer analyzer;
106 final DeferredAttr deferredAttr;
107 final Check chk;
108 final Flow flow;
109 final MemberEnter memberEnter;
110 final TypeEnter typeEnter;
111 final TreeMaker make;
112 final ConstFold cfolder;
113 final Enter enter;
114 final Target target;
115 final Types types;
116 final Preview preview;
117 final JCDiagnostic.Factory diags;
118 final TypeAnnotations typeAnnotations;
119 final DeferredLintHandler deferredLintHandler;
120 final TypeEnvs typeEnvs;
121 final Dependencies dependencies;
122 final Annotate annotate;
123 final ArgumentAttr argumentAttr;
124 final MatchBindingsComputer matchBindingsComputer;
125 final AttrRecover attrRecover;
126
127 public static Attr instance(Context context) {
128 Attr instance = context.get(attrKey);
129 if (instance == null)
130 instance = new Attr(context);
131 return instance;
132 }
133
134 @SuppressWarnings("this-escape")
135 protected Attr(Context context) {
136 context.put(attrKey, this);
137
138 names = Names.instance(context);
139 log = Log.instance(context);
140 syms = Symtab.instance(context);
141 rs = Resolve.instance(context);
142 operators = Operators.instance(context);
143 chk = Check.instance(context);
144 flow = Flow.instance(context);
145 memberEnter = MemberEnter.instance(context);
146 typeEnter = TypeEnter.instance(context);
147 make = TreeMaker.instance(context);
148 enter = Enter.instance(context);
149 infer = Infer.instance(context);
150 analyzer = Analyzer.instance(context);
151 deferredAttr = DeferredAttr.instance(context);
152 cfolder = ConstFold.instance(context);
153 target = Target.instance(context);
154 types = Types.instance(context);
155 preview = Preview.instance(context);
156 diags = JCDiagnostic.Factory.instance(context);
157 annotate = Annotate.instance(context);
158 typeAnnotations = TypeAnnotations.instance(context);
159 deferredLintHandler = DeferredLintHandler.instance(context);
160 typeEnvs = TypeEnvs.instance(context);
161 dependencies = Dependencies.instance(context);
162 argumentAttr = ArgumentAttr.instance(context);
163 matchBindingsComputer = MatchBindingsComputer.instance(context);
164 attrRecover = AttrRecover.instance(context);
165
166 Options options = Options.instance(context);
167
168 Source source = Source.instance(context);
169 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
170 allowRecords = Feature.RECORDS.allowedInSource(source);
171 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
172 Feature.PATTERN_SWITCH.allowedInSource(source);
173 allowUnconditionalPatternsInstanceOf =
174 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
175 sourceName = source.name;
176 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
177
178 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
179 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
180 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
181 methodAttrInfo = new MethodAttrInfo();
182 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
183 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
184 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
185 }
186
187 /** Switch: reifiable types in instanceof enabled?
188 */
189 boolean allowReifiableTypesInInstanceof;
190
191 /** Are records allowed
192 */
193 private final boolean allowRecords;
194
195 /** Are patterns in switch allowed
196 */
197 private final boolean allowPatternSwitch;
198
199 /** Are unconditional patterns in instanceof allowed
200 */
201 private final boolean allowUnconditionalPatternsInstanceOf;
202
203 /**
204 * Switch: warn about use of variable before declaration?
205 * RFE: 6425594
206 */
207 boolean useBeforeDeclarationWarning;
208
209 /**
210 * Switch: name of source level; used for error reporting.
211 */
212 String sourceName;
213
214 /** Check kind and type of given tree against protokind and prototype.
215 * If check succeeds, store type in tree and return it.
216 * If check fails, store errType in tree and return it.
217 * No checks are performed if the prototype is a method type.
218 * It is not necessary in this case since we know that kind and type
219 * are correct.
220 *
221 * @param tree The tree whose kind and type is checked
222 * @param found The computed type of the tree
223 * @param ownkind The computed kind of the tree
224 * @param resultInfo The expected result of the tree
225 */
226 Type check(final JCTree tree,
227 final Type found,
228 final KindSelector ownkind,
229 final ResultInfo resultInfo) {
230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
231 Type owntype;
232 boolean shouldCheck = !found.hasTag(ERROR) &&
233 !resultInfo.pt.hasTag(METHOD) &&
234 !resultInfo.pt.hasTag(FORALL);
235 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
236 log.error(tree.pos(),
237 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
238 ownkind.kindNames()));
239 owntype = types.createErrorType(found);
240 } else if (inferenceContext.free(found)) {
241 //delay the check if there are inference variables in the found type
242 //this means we are dealing with a partially inferred poly expression
243 owntype = shouldCheck ? resultInfo.pt : found;
244 if (resultInfo.checkMode.installPostInferenceHook()) {
245 inferenceContext.addFreeTypeListener(List.of(found),
246 instantiatedContext -> {
247 ResultInfo pendingResult =
248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
250 });
251 }
252 } else {
253 owntype = shouldCheck ?
254 resultInfo.check(tree, found) :
255 found;
256 }
257 if (resultInfo.checkMode.updateTreeType()) {
258 tree.type = owntype;
259 }
260 return owntype;
261 }
262
263 /** Is given blank final variable assignable, i.e. in a scope where it
264 * may be assigned to even though it is final?
265 * @param v The blank final variable.
266 * @param env The current environment.
267 */
268 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
269 Symbol owner = env.info.scope.owner;
270 // owner refers to the innermost variable, method or
271 // initializer block declaration at this point.
272 boolean isAssignable =
273 v.owner == owner
274 ||
275 ((owner.name == names.init || // i.e. we are in a constructor
276 owner.kind == VAR || // i.e. we are in a variable initializer
277 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
278 &&
279 v.owner == owner.owner
280 &&
281 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
282 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
283 return isAssignable & !insideCompactConstructor;
284 }
285
286 /** Check that variable can be assigned to.
287 * @param pos The current source code position.
288 * @param v The assigned variable
289 * @param base If the variable is referred to in a Select, the part
290 * to the left of the `.', null otherwise.
291 * @param env The current environment.
292 */
293 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
294 if (v.name == names._this) {
295 log.error(pos, Errors.CantAssignValToThis);
296 return;
297 }
298 if ((v.flags() & FINAL) != 0 &&
299 ((v.flags() & HASINIT) != 0
300 ||
301 !((base == null ||
302 TreeInfo.isThisQualifier(base)) &&
303 isAssignableAsBlankFinal(v, env)))) {
304 if (v.isResourceVariable()) { //TWR resource
305 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
306 } else {
307 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
308 }
309 return;
310 }
311
312 // Check instance field assignments that appear in constructor prologues
313 if (rs.isEarlyReference(env, base, v)) {
314
315 // Field may not be inherited from a superclass
316 if (v.owner != env.enclClass.sym) {
317 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
318 return;
319 }
320
321 // Field may not have an initializer
322 if ((v.flags() & HASINIT) != 0) {
323 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
324 return;
325 }
326 }
327
328 if (!env.info.ctorPrologue &&
329 v.owner.isValueClass() &&
330 v.owner.kind == TYP &&
331 v.owner == env.enclClass.sym &&
332 (v.flags() & STATIC) == 0 &&
333 (base == null ||
334 TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, base))) {
335 log.error(pos, Errors.CantRefAfterCtorCalled(v));
336 }
337 }
338
339 /** Does tree represent a static reference to an identifier?
340 * It is assumed that tree is either a SELECT or an IDENT.
341 * We have to weed out selects from non-type names here.
342 * @param tree The candidate tree.
343 */
344 boolean isStaticReference(JCTree tree) {
345 if (tree.hasTag(SELECT)) {
346 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
347 if (lsym == null || lsym.kind != TYP) {
348 return false;
349 }
350 }
351 return true;
352 }
353
354 /** Is this symbol a type?
355 */
356 static boolean isType(Symbol sym) {
357 return sym != null && sym.kind == TYP;
358 }
359
360 /** Attribute a parsed identifier.
361 * @param tree Parsed identifier name
362 * @param topLevel The toplevel to use
363 */
364 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
365 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
366 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
367 syms.errSymbol.name,
368 null, null, null, null);
369 localEnv.enclClass.sym = syms.errSymbol;
370 return attribIdent(tree, localEnv);
371 }
372
373 /** Attribute a parsed identifier.
374 * @param tree Parsed identifier name
375 * @param env The env to use
376 */
377 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
378 return tree.accept(identAttributer, env);
379 }
380 // where
381 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
382 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
383 @Override @DefinedBy(Api.COMPILER_TREE)
384 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
385 Symbol site = visit(node.getExpression(), env);
386 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
387 return site;
388 Name name = (Name)node.getIdentifier();
389 if (site.kind == PCK) {
390 env.toplevel.packge = (PackageSymbol)site;
391 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
392 KindSelector.TYP_PCK);
393 } else {
394 env.enclClass.sym = (ClassSymbol)site;
395 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
396 }
397 }
398
399 @Override @DefinedBy(Api.COMPILER_TREE)
400 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
401 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
402 }
403 }
404
405 public Type coerce(Type etype, Type ttype) {
406 return cfolder.coerce(etype, ttype);
407 }
408
409 public Type attribType(JCTree node, TypeSymbol sym) {
410 Env<AttrContext> env = typeEnvs.get(sym);
411 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
412 return attribTree(node, localEnv, unknownTypeInfo);
413 }
414
415 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
416 // Attribute qualifying package or class.
417 JCFieldAccess s = tree.qualid;
418 return attribTree(s.selected, env,
419 new ResultInfo(tree.staticImport ?
420 KindSelector.TYP : KindSelector.TYP_PCK,
421 Type.noType));
422 }
423
424 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
425 return attribToTree(expr, env, tree, unknownExprInfo);
426 }
427
428 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
429 return attribToTree(stmt, env, tree, statInfo);
430 }
431
432 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
433 breakTree = tree;
434 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
435 try {
436 deferredAttr.attribSpeculative(root, env, resultInfo,
437 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
438 argumentAttr.withLocalCacheContext());
439 attrRecover.doRecovery();
440 } catch (BreakAttr b) {
441 return b.env;
442 } catch (AssertionError ae) {
443 if (ae.getCause() instanceof BreakAttr breakAttr) {
444 return breakAttr.env;
445 } else {
446 throw ae;
447 }
448 } finally {
449 breakTree = null;
450 log.useSource(prev);
451 }
452 return env;
453 }
454
455 private JCTree breakTree = null;
456
457 private static class BreakAttr extends RuntimeException {
458 static final long serialVersionUID = -6924771130405446405L;
459 private transient Env<AttrContext> env;
460 private BreakAttr(Env<AttrContext> env) {
461 this.env = env;
462 }
463 }
464
465 /**
466 * Mode controlling behavior of Attr.Check
467 */
468 enum CheckMode {
469
470 NORMAL,
471
472 /**
473 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
474 * that the captured var cache in {@code InferenceContext} will be used in read-only
475 * mode when performing inference checks.
476 */
477 NO_TREE_UPDATE {
478 @Override
479 public boolean updateTreeType() {
480 return false;
481 }
482 },
483 /**
484 * Mode signalling that caller will manage free types in tree decorations.
485 */
486 NO_INFERENCE_HOOK {
487 @Override
488 public boolean installPostInferenceHook() {
489 return false;
490 }
491 };
492
493 public boolean updateTreeType() {
494 return true;
495 }
496 public boolean installPostInferenceHook() {
497 return true;
498 }
499 }
500
501
502 class ResultInfo {
503 final KindSelector pkind;
504 final Type pt;
505 final CheckContext checkContext;
506 final CheckMode checkMode;
507
508 ResultInfo(KindSelector pkind, Type pt) {
509 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
510 }
511
512 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
513 this(pkind, pt, chk.basicHandler, checkMode);
514 }
515
516 protected ResultInfo(KindSelector pkind,
517 Type pt, CheckContext checkContext) {
518 this(pkind, pt, checkContext, CheckMode.NORMAL);
519 }
520
521 protected ResultInfo(KindSelector pkind,
522 Type pt, CheckContext checkContext, CheckMode checkMode) {
523 this.pkind = pkind;
524 this.pt = pt;
525 this.checkContext = checkContext;
526 this.checkMode = checkMode;
527 }
528
529 /**
530 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
531 * @param tree The tree to be type-checked.
532 * @return true if {@code ArgumentAttr} should be used.
533 */
534 protected boolean needsArgumentAttr(JCTree tree) { return false; }
535
536 protected Type check(final DiagnosticPosition pos, final Type found) {
537 return chk.checkType(pos, found, pt, checkContext);
538 }
539
540 protected ResultInfo dup(Type newPt) {
541 return new ResultInfo(pkind, newPt, checkContext, checkMode);
542 }
543
544 protected ResultInfo dup(CheckContext newContext) {
545 return new ResultInfo(pkind, pt, newContext, checkMode);
546 }
547
548 protected ResultInfo dup(Type newPt, CheckContext newContext) {
549 return new ResultInfo(pkind, newPt, newContext, checkMode);
550 }
551
552 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
553 return new ResultInfo(pkind, newPt, newContext, newMode);
554 }
555
556 protected ResultInfo dup(CheckMode newMode) {
557 return new ResultInfo(pkind, pt, checkContext, newMode);
558 }
559
560 @Override
561 public String toString() {
562 if (pt != null) {
563 return pt.toString();
564 } else {
565 return "";
566 }
567 }
568 }
569
570 class MethodAttrInfo extends ResultInfo {
571 public MethodAttrInfo() {
572 this(chk.basicHandler);
573 }
574
575 public MethodAttrInfo(CheckContext checkContext) {
576 super(KindSelector.VAL, Infer.anyPoly, checkContext);
577 }
578
579 @Override
580 protected boolean needsArgumentAttr(JCTree tree) {
581 return true;
582 }
583
584 protected ResultInfo dup(Type newPt) {
585 throw new IllegalStateException();
586 }
587
588 protected ResultInfo dup(CheckContext newContext) {
589 return new MethodAttrInfo(newContext);
590 }
591
592 protected ResultInfo dup(Type newPt, CheckContext newContext) {
593 throw new IllegalStateException();
594 }
595
596 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
597 throw new IllegalStateException();
598 }
599
600 protected ResultInfo dup(CheckMode newMode) {
601 throw new IllegalStateException();
602 }
603 }
604
605 class RecoveryInfo extends ResultInfo {
606
607 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
608 this(deferredAttrContext, Type.recoveryType);
609 }
610
611 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
612 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
613 @Override
614 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
615 return deferredAttrContext;
616 }
617 @Override
618 public boolean compatible(Type found, Type req, Warner warn) {
619 return true;
620 }
621 @Override
622 public void report(DiagnosticPosition pos, JCDiagnostic details) {
623 boolean needsReport = pt == Type.recoveryType ||
624 (details.getDiagnosticPosition() != null &&
625 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
626 if (needsReport) {
627 chk.basicHandler.report(pos, details);
628 }
629 }
630 });
631 }
632 }
633
634 final ResultInfo statInfo;
635 final ResultInfo varAssignmentInfo;
636 final ResultInfo methodAttrInfo;
637 final ResultInfo unknownExprInfo;
638 final ResultInfo unknownTypeInfo;
639 final ResultInfo unknownTypeExprInfo;
640 final ResultInfo recoveryInfo;
641
642 Type pt() {
643 return resultInfo.pt;
644 }
645
646 KindSelector pkind() {
647 return resultInfo.pkind;
648 }
649
650 /* ************************************************************************
651 * Visitor methods
652 *************************************************************************/
653
654 /** Visitor argument: the current environment.
655 */
656 Env<AttrContext> env;
657
658 /** Visitor argument: the currently expected attribution result.
659 */
660 ResultInfo resultInfo;
661
662 /** Visitor result: the computed type.
663 */
664 Type result;
665
666 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
667
668 /** Visitor method: attribute a tree, catching any completion failure
669 * exceptions. Return the tree's type.
670 *
671 * @param tree The tree to be visited.
672 * @param env The environment visitor argument.
673 * @param resultInfo The result info visitor argument.
674 */
675 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
676 Env<AttrContext> prevEnv = this.env;
677 ResultInfo prevResult = this.resultInfo;
678 try {
679 this.env = env;
680 this.resultInfo = resultInfo;
681 if (resultInfo.needsArgumentAttr(tree)) {
682 result = argumentAttr.attribArg(tree, env);
683 } else {
684 tree.accept(this);
685 }
686 matchBindings = matchBindingsComputer.finishBindings(tree,
687 matchBindings);
688 if (tree == breakTree &&
689 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
690 breakTreeFound(copyEnv(env));
691 }
692 return result;
693 } catch (CompletionFailure ex) {
694 tree.type = syms.errType;
695 return chk.completionError(tree.pos(), ex);
696 } finally {
697 this.env = prevEnv;
698 this.resultInfo = prevResult;
699 }
700 }
701
702 protected void breakTreeFound(Env<AttrContext> env) {
703 throw new BreakAttr(env);
704 }
705
706 Env<AttrContext> copyEnv(Env<AttrContext> env) {
707 Env<AttrContext> newEnv =
708 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
709 if (newEnv.outer != null) {
710 newEnv.outer = copyEnv(newEnv.outer);
711 }
712 return newEnv;
713 }
714
715 WriteableScope copyScope(WriteableScope sc) {
716 WriteableScope newScope = WriteableScope.create(sc.owner);
717 List<Symbol> elemsList = List.nil();
718 for (Symbol sym : sc.getSymbols()) {
719 elemsList = elemsList.prepend(sym);
720 }
721 for (Symbol s : elemsList) {
722 newScope.enter(s);
723 }
724 return newScope;
725 }
726
727 /** Derived visitor method: attribute an expression tree.
728 */
729 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
730 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
731 }
732
733 /** Derived visitor method: attribute an expression tree with
734 * no constraints on the computed type.
735 */
736 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
737 return attribTree(tree, env, unknownExprInfo);
738 }
739
740 /** Derived visitor method: attribute a type tree.
741 */
742 public Type attribType(JCTree tree, Env<AttrContext> env) {
743 Type result = attribType(tree, env, Type.noType);
744 return result;
745 }
746
747 /** Derived visitor method: attribute a type tree.
748 */
749 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
750 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
751 return result;
752 }
753
754 /** Derived visitor method: attribute a statement or definition tree.
755 */
756 public Type attribStat(JCTree tree, Env<AttrContext> env) {
757 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
758 Type result = attribTree(tree, env, statInfo);
759 analyzer.analyzeIfNeeded(tree, analyzeEnv);
760 attrRecover.doRecovery();
761 return result;
762 }
763
764 /** Attribute a list of expressions, returning a list of types.
765 */
766 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
767 ListBuffer<Type> ts = new ListBuffer<>();
768 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
769 ts.append(attribExpr(l.head, env, pt));
770 return ts.toList();
771 }
772
773 /** Attribute a list of statements, returning nothing.
774 */
775 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
776 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
777 attribStat(l.head, env);
778 }
779
780 /** Attribute the arguments in a method call, returning the method kind.
781 */
782 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
783 KindSelector kind = initialKind;
784 for (JCExpression arg : trees) {
785 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
786 if (argtype.hasTag(DEFERRED)) {
787 kind = KindSelector.of(KindSelector.POLY, kind);
788 }
789 argtypes.append(argtype);
790 }
791 return kind;
792 }
793
794 /** Attribute a type argument list, returning a list of types.
795 * Caller is responsible for calling checkRefTypes.
796 */
797 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
798 ListBuffer<Type> argtypes = new ListBuffer<>();
799 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
800 argtypes.append(attribType(l.head, env));
801 return argtypes.toList();
802 }
803
804 /** Attribute a type argument list, returning a list of types.
805 * Check that all the types are references.
806 */
807 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
808 List<Type> types = attribAnyTypes(trees, env);
809 return chk.checkRefTypes(trees, types);
810 }
811
812 /**
813 * Attribute type variables (of generic classes or methods).
814 * Compound types are attributed later in attribBounds.
815 * @param typarams the type variables to enter
816 * @param env the current environment
817 */
818 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
819 for (JCTypeParameter tvar : typarams) {
820 TypeVar a = (TypeVar)tvar.type;
821 a.tsym.flags_field |= UNATTRIBUTED;
822 a.setUpperBound(Type.noType);
823 if (!tvar.bounds.isEmpty()) {
824 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
825 for (JCExpression bound : tvar.bounds.tail)
826 bounds = bounds.prepend(attribType(bound, env));
827 types.setBounds(a, bounds.reverse());
828 } else {
829 // if no bounds are given, assume a single bound of
830 // java.lang.Object.
831 types.setBounds(a, List.of(syms.objectType));
832 }
833 a.tsym.flags_field &= ~UNATTRIBUTED;
834 }
835 if (checkCyclic) {
836 for (JCTypeParameter tvar : typarams) {
837 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
838 }
839 }
840 }
841
842 /**
843 * Attribute the type references in a list of annotations.
844 */
845 void attribAnnotationTypes(List<JCAnnotation> annotations,
846 Env<AttrContext> env) {
847 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
848 JCAnnotation a = al.head;
849 attribType(a.annotationType, env);
850 }
851 }
852
853 /**
854 * Attribute a "lazy constant value".
855 * @param env The env for the const value
856 * @param variable The initializer for the const value
857 * @param type The expected type, or null
858 * @see VarSymbol#setLazyConstValue
859 */
860 public Object attribLazyConstantValue(Env<AttrContext> env,
861 JCVariableDecl variable,
862 Type type) {
863
864 DiagnosticPosition prevLintPos
865 = deferredLintHandler.setPos(variable.pos());
866
867 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
868 try {
869 Type itype = attribExpr(variable.init, env, type);
870 if (variable.isImplicitlyTyped()) {
871 //fixup local variable type
872 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
873 }
874 if (itype.constValue() != null) {
875 return coerce(itype, type).constValue();
876 } else {
877 return null;
878 }
879 } finally {
880 log.useSource(prevSource);
881 deferredLintHandler.setPos(prevLintPos);
882 }
883 }
884
885 /** Attribute type reference in an `extends' or `implements' clause.
886 * Supertypes of anonymous inner classes are usually already attributed.
887 *
888 * @param tree The tree making up the type reference.
889 * @param env The environment current at the reference.
890 * @param classExpected true if only a class is expected here.
891 * @param interfaceExpected true if only an interface is expected here.
892 */
893 Type attribBase(JCTree tree,
894 Env<AttrContext> env,
895 boolean classExpected,
896 boolean interfaceExpected,
897 boolean checkExtensible) {
898 Type t = tree.type != null ?
899 tree.type :
900 attribType(tree, env);
901 try {
902 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
903 } catch (CompletionFailure ex) {
904 chk.completionError(tree.pos(), ex);
905 return t;
906 }
907 }
908 Type checkBase(Type t,
909 JCTree tree,
910 Env<AttrContext> env,
911 boolean classExpected,
912 boolean interfaceExpected,
913 boolean checkExtensible) {
914 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
915 (((JCTypeApply) tree).clazz).pos() : tree.pos();
916 if (t.tsym.isAnonymous()) {
917 log.error(pos, Errors.CantInheritFromAnon);
918 return types.createErrorType(t);
919 }
920 if (t.isErroneous())
921 return t;
922 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
923 // check that type variable is already visible
924 if (t.getUpperBound() == null) {
925 log.error(pos, Errors.IllegalForwardRef);
926 return types.createErrorType(t);
927 }
928 } else {
929 t = chk.checkClassType(pos, t, checkExtensible);
930 }
931 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
932 log.error(pos, Errors.IntfExpectedHere);
933 // return errType is necessary since otherwise there might
934 // be undetected cycles which cause attribution to loop
935 return types.createErrorType(t);
936 } else if (checkExtensible &&
937 classExpected &&
938 (t.tsym.flags() & INTERFACE) != 0) {
939 log.error(pos, Errors.NoIntfExpectedHere);
940 return types.createErrorType(t);
941 }
942 if (checkExtensible &&
943 ((t.tsym.flags() & FINAL) != 0)) {
944 log.error(pos,
945 Errors.CantInheritFromFinal(t.tsym));
946 }
947 chk.checkNonCyclic(pos, t);
948 return t;
949 }
950
951 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
952 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
953 id.type = env.info.scope.owner.enclClass().type;
954 id.sym = env.info.scope.owner.enclClass();
955 return id.type;
956 }
957
958 public void visitClassDef(JCClassDecl tree) {
959 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
960 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
961 argumentAttr.withLocalCacheContext() : null);
962 boolean ctorProloguePrev = env.info.ctorPrologue;
963 try {
964 // Local and anonymous classes have not been entered yet, so we need to
965 // do it now.
966 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
967 enter.classEnter(tree, env);
968 } else {
969 // If this class declaration is part of a class level annotation,
970 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
971 // order to simplify later steps and allow for sensible error
972 // messages.
973 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
974 enter.classEnter(tree, env);
975 }
976
977 ClassSymbol c = tree.sym;
978 if (c == null) {
979 // exit in case something drastic went wrong during enter.
980 result = null;
981 } else {
982 // make sure class has been completed:
983 c.complete();
984
985 // If a class declaration appears in a constructor prologue,
986 // that means it's either a local class or an anonymous class.
987 // Either way, there is no immediately enclosing instance.
988 if (ctorProloguePrev) {
989 c.flags_field |= NOOUTERTHIS;
990 }
991 attribClass(tree.pos(), c);
992 result = tree.type = c.type;
993 }
994 } finally {
995 localCacheContext.ifPresent(LocalCacheContext::leave);
996 env.info.ctorPrologue = ctorProloguePrev;
997 }
998 }
999
1000 public void visitMethodDef(JCMethodDecl tree) {
1001 MethodSymbol m = tree.sym;
1002 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1003
1004 Lint lint = env.info.lint.augment(m);
1005 Lint prevLint = chk.setLint(lint);
1006 boolean ctorProloguePrev = env.info.ctorPrologue;
1007 Assert.check(!env.info.ctorPrologue);
1008 MethodSymbol prevMethod = chk.setMethod(m);
1009 try {
1010 deferredLintHandler.flush(tree.pos(), lint);
1011 chk.checkDeprecatedAnnotation(tree.pos(), m);
1012
1013
1014 // Create a new environment with local scope
1015 // for attributing the method.
1016 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1017 localEnv.info.lint = lint;
1018
1019 attribStats(tree.typarams, localEnv);
1020
1021 // If we override any other methods, check that we do so properly.
1022 // JLS ???
1023 if (m.isStatic()) {
1024 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1025 } else {
1026 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1027 }
1028 chk.checkOverride(env, tree, m);
1029
1030 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1031 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1032 }
1033
1034 // Enter all type parameters into the local method scope.
1035 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1036 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1037
1038 ClassSymbol owner = env.enclClass.sym;
1039 if ((owner.flags() & ANNOTATION) != 0 &&
1040 (tree.params.nonEmpty() ||
1041 tree.recvparam != null))
1042 log.error(tree.params.nonEmpty() ?
1043 tree.params.head.pos() :
1044 tree.recvparam.pos(),
1045 Errors.IntfAnnotationMembersCantHaveParams);
1046
1047 // Attribute all value parameters.
1048 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1049 attribStat(l.head, localEnv);
1050 }
1051
1052 chk.checkVarargsMethodDecl(localEnv, tree);
1053
1054 // Check that type parameters are well-formed.
1055 chk.validate(tree.typarams, localEnv);
1056
1057 // Check that result type is well-formed.
1058 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1059 chk.validate(tree.restype, localEnv);
1060
1061 // Check that receiver type is well-formed.
1062 if (tree.recvparam != null) {
1063 // Use a new environment to check the receiver parameter.
1064 // Otherwise I get "might not have been initialized" errors.
1065 // Is there a better way?
1066 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1067 attribType(tree.recvparam, newEnv);
1068 chk.validate(tree.recvparam, newEnv);
1069 }
1070
1071 // Is this method a constructor?
1072 boolean isConstructor = TreeInfo.isConstructor(tree);
1073
1074 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1075 // lets find if this method is an accessor
1076 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1077 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1078 if (recordComponent.isPresent()) {
1079 // the method is a user defined accessor lets check that everything is fine
1080 if (!tree.sym.isPublic()) {
1081 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1082 }
1083 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1084 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1085 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1086 }
1087 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1088 log.error(tree,
1089 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1090 }
1091 if (!tree.typarams.isEmpty()) {
1092 log.error(tree,
1093 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1094 }
1095 if (tree.sym.isStatic()) {
1096 log.error(tree,
1097 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1098 }
1099 }
1100
1101 if (isConstructor) {
1102 // if this a constructor other than the canonical one
1103 if ((tree.sym.flags_field & RECORD) == 0) {
1104 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1105 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1106 }
1107 } else {
1108 // but if it is the canonical:
1109
1110 /* if user generated, then it shouldn't:
1111 * - have an accessibility stricter than that of the record type
1112 * - explicitly invoke any other constructor
1113 */
1114 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1115 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1116 log.error(tree,
1117 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1118 Errors.InvalidCanonicalConstructorInRecord(
1119 Fragments.Canonical,
1120 env.enclClass.sym.name,
1121 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1122 ) :
1123 Errors.InvalidCanonicalConstructorInRecord(
1124 Fragments.Canonical,
1125 env.enclClass.sym.name,
1126 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1127 )
1128 );
1129 }
1130
1131 if (TreeInfo.hasAnyConstructorCall(tree)) {
1132 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1133 Fragments.Canonical, env.enclClass.sym.name,
1134 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1135 }
1136 }
1137
1138 // also we want to check that no type variables have been defined
1139 if (!tree.typarams.isEmpty()) {
1140 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1141 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1142 }
1143
1144 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1145 * record components
1146 */
1147 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1148 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1149 for (JCVariableDecl param: tree.params) {
1150 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1151 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1152 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1153 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1154 Fragments.Canonical, env.enclClass.sym.name,
1155 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1156 }
1157 recordComponents = recordComponents.tail;
1158 recordFieldTypes = recordFieldTypes.tail;
1159 }
1160 }
1161 }
1162 }
1163
1164 // annotation method checks
1165 if ((owner.flags() & ANNOTATION) != 0) {
1166 // annotation method cannot have throws clause
1167 if (tree.thrown.nonEmpty()) {
1168 log.error(tree.thrown.head.pos(),
1169 Errors.ThrowsNotAllowedInIntfAnnotation);
1170 }
1171 // annotation method cannot declare type-parameters
1172 if (tree.typarams.nonEmpty()) {
1173 log.error(tree.typarams.head.pos(),
1174 Errors.IntfAnnotationMembersCantHaveTypeParams);
1175 }
1176 // validate annotation method's return type (could be an annotation type)
1177 chk.validateAnnotationType(tree.restype);
1178 // ensure that annotation method does not clash with members of Object/Annotation
1179 chk.validateAnnotationMethod(tree.pos(), m);
1180 }
1181
1182 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1183 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1184
1185 if (tree.body == null) {
1186 // Empty bodies are only allowed for
1187 // abstract, native, or interface methods, or for methods
1188 // in a retrofit signature class.
1189 if (tree.defaultValue != null) {
1190 if ((owner.flags() & ANNOTATION) == 0)
1191 log.error(tree.pos(),
1192 Errors.DefaultAllowedInIntfAnnotationMember);
1193 }
1194 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1195 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1196 } else {
1197 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1198 if ((owner.flags() & INTERFACE) != 0) {
1199 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1200 } else {
1201 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1202 }
1203 } else if ((tree.mods.flags & NATIVE) != 0) {
1204 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1205 }
1206 // Add an implicit super() call unless an explicit call to
1207 // super(...) or this(...) is given
1208 // or we are compiling class java.lang.Object.
1209 if (isConstructor && owner.type != syms.objectType) {
1210 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1211 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1212 make.Ident(names._super), make.Idents(List.nil())));
1213 if (owner.isValueClass()) {
1214 tree.body.stats = tree.body.stats.append(supCall);
1215 } else {
1216 tree.body.stats = tree.body.stats.prepend(supCall);
1217 }
1218 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1219 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1220 TreeInfo.hasConstructorCall(tree, names._super)) {
1221 // enum constructors are not allowed to call super
1222 // directly, so make sure there aren't any super calls
1223 // in enum constructors, except in the compiler
1224 // generated one.
1225 log.error(tree.body.stats.head.pos(),
1226 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1227 }
1228 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1229 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1230 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1231 if (!initParamNames.equals(recordComponentNames)) {
1232 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1233 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1234 }
1235 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1236 log.error(tree,
1237 Errors.InvalidCanonicalConstructorInRecord(
1238 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1239 env.enclClass.sym.name,
1240 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1241 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1242 }
1243 }
1244 }
1245
1246 // Attribute all type annotations in the body
1247 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1248 annotate.flush();
1249
1250 // Start of constructor prologue
1251 localEnv.info.ctorPrologue = isConstructor;
1252
1253 // Attribute method body.
1254 attribStat(tree.body, localEnv);
1255 }
1256
1257 localEnv.info.scope.leave();
1258 result = tree.type = m.type;
1259 } finally {
1260 chk.setLint(prevLint);
1261 chk.setMethod(prevMethod);
1262 env.info.ctorPrologue = ctorProloguePrev;
1263 }
1264 }
1265
1266 public void visitVarDef(JCVariableDecl tree) {
1267 // Local variables have not been entered yet, so we need to do it now:
1268 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1269 if (tree.sym != null) {
1270 // parameters have already been entered
1271 env.info.scope.enter(tree.sym);
1272 } else {
1273 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1274 if (tree.init == null) {
1275 //cannot use 'var' without initializer
1276 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1277 tree.vartype = make.Erroneous();
1278 } else {
1279 Fragment msg = canInferLocalVarType(tree);
1280 if (msg != null) {
1281 //cannot use 'var' with initializer which require an explicit target
1282 //(e.g. lambda, method reference, array initializer).
1283 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1284 tree.vartype = make.Erroneous();
1285 }
1286 }
1287 }
1288 try {
1289 annotate.blockAnnotations();
1290 memberEnter.memberEnter(tree, env);
1291 } finally {
1292 annotate.unblockAnnotations();
1293 }
1294 }
1295 } else {
1296 if (tree.init != null) {
1297 // Field initializer expression need to be entered.
1298 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1299 annotate.flush();
1300 }
1301 }
1302
1303 VarSymbol v = tree.sym;
1304 Lint lint = env.info.lint.augment(v);
1305 Lint prevLint = chk.setLint(lint);
1306
1307 // Check that the variable's declared type is well-formed.
1308 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1309 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1310 (tree.sym.flags() & PARAMETER) != 0;
1311 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1312
1313 try {
1314 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1315 deferredLintHandler.flush(tree.pos(), lint);
1316 chk.checkDeprecatedAnnotation(tree.pos(), v);
1317
1318 if (tree.init != null) {
1319 if ((v.flags_field & FINAL) == 0 ||
1320 !memberEnter.needsLazyConstValue(tree.init)) {
1321 // Not a compile-time constant
1322 // Attribute initializer in a new environment
1323 // with the declared variable as owner.
1324 // Check that initializer conforms to variable's declared type.
1325 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1326 initEnv.info.lint = lint;
1327 // In order to catch self-references, we set the variable's
1328 // declaration position to maximal possible value, effectively
1329 // marking the variable as undefined.
1330 initEnv.info.enclVar = v;
1331 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1332 try {
1333 if (v.owner.kind == TYP && v.owner.isValueClass() && !v.isStatic()) {
1334 // strict instance initializer in a value class
1335 initEnv.info.ctorPrologue = true;
1336 }
1337 attribExpr(tree.init, initEnv, v.type);
1338 if (tree.isImplicitlyTyped()) {
1339 //fixup local variable type
1340 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1341 }
1342 } finally {
1343 initEnv.info.ctorPrologue = previousCtorPrologue;
1344 }
1345 }
1346 if (tree.isImplicitlyTyped()) {
1347 setSyntheticVariableType(tree, v.type);
1348 }
1349 }
1350 result = tree.type = v.type;
1351 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1352 if (isNonArgsMethodInObject(v.name)) {
1353 log.error(tree, Errors.IllegalRecordComponentName(v));
1354 }
1355 }
1356 }
1357 finally {
1358 chk.setLint(prevLint);
1359 }
1360 }
1361
1362 private boolean isNonArgsMethodInObject(Name name) {
1363 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1364 if (s.type.getParameterTypes().isEmpty()) {
1365 return true;
1366 }
1367 }
1368 return false;
1369 }
1370
1371 Fragment canInferLocalVarType(JCVariableDecl tree) {
1372 LocalInitScanner lis = new LocalInitScanner();
1373 lis.scan(tree.init);
1374 return lis.badInferenceMsg;
1375 }
1376
1377 static class LocalInitScanner extends TreeScanner {
1378 Fragment badInferenceMsg = null;
1379 boolean needsTarget = true;
1380
1381 @Override
1382 public void visitNewArray(JCNewArray tree) {
1383 if (tree.elemtype == null && needsTarget) {
1384 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1385 }
1386 }
1387
1388 @Override
1389 public void visitLambda(JCLambda tree) {
1390 if (needsTarget) {
1391 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1392 }
1393 }
1394
1395 @Override
1396 public void visitTypeCast(JCTypeCast tree) {
1397 boolean prevNeedsTarget = needsTarget;
1398 try {
1399 needsTarget = false;
1400 super.visitTypeCast(tree);
1401 } finally {
1402 needsTarget = prevNeedsTarget;
1403 }
1404 }
1405
1406 @Override
1407 public void visitReference(JCMemberReference tree) {
1408 if (needsTarget) {
1409 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1410 }
1411 }
1412
1413 @Override
1414 public void visitNewClass(JCNewClass tree) {
1415 boolean prevNeedsTarget = needsTarget;
1416 try {
1417 needsTarget = false;
1418 super.visitNewClass(tree);
1419 } finally {
1420 needsTarget = prevNeedsTarget;
1421 }
1422 }
1423
1424 @Override
1425 public void visitApply(JCMethodInvocation tree) {
1426 boolean prevNeedsTarget = needsTarget;
1427 try {
1428 needsTarget = false;
1429 super.visitApply(tree);
1430 } finally {
1431 needsTarget = prevNeedsTarget;
1432 }
1433 }
1434 }
1435
1436 public void visitSkip(JCSkip tree) {
1437 result = null;
1438 }
1439
1440 public void visitBlock(JCBlock tree) {
1441 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1442 // Block is a static or instance initializer;
1443 // let the owner of the environment be a freshly
1444 // created BLOCK-method.
1445 Symbol fakeOwner =
1446 new MethodSymbol(tree.flags | BLOCK |
1447 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1448 env.info.scope.owner);
1449 final Env<AttrContext> localEnv =
1450 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1451
1452 if ((tree.flags & STATIC) != 0) {
1453 localEnv.info.staticLevel++;
1454 } else {
1455 localEnv.info.instanceInitializerBlock = true;
1456 }
1457 // Attribute all type annotations in the block
1458 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1459 annotate.flush();
1460 attribStats(tree.stats, localEnv);
1461
1462 {
1463 // Store init and clinit type annotations with the ClassSymbol
1464 // to allow output in Gen.normalizeDefs.
1465 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1466 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1467 if ((tree.flags & STATIC) != 0) {
1468 cs.appendClassInitTypeAttributes(tas);
1469 } else {
1470 cs.appendInitTypeAttributes(tas);
1471 }
1472 }
1473 } else {
1474 // Create a new local environment with a local scope.
1475 Env<AttrContext> localEnv =
1476 env.dup(tree, env.info.dup(env.info.scope.dup()));
1477 try {
1478 attribStats(tree.stats, localEnv);
1479 } finally {
1480 localEnv.info.scope.leave();
1481 }
1482 }
1483 result = null;
1484 }
1485
1486 public void visitDoLoop(JCDoWhileLoop tree) {
1487 attribStat(tree.body, env.dup(tree));
1488 attribExpr(tree.cond, env, syms.booleanType);
1489 handleLoopConditionBindings(matchBindings, tree, tree.body);
1490 result = null;
1491 }
1492
1493 public void visitWhileLoop(JCWhileLoop tree) {
1494 attribExpr(tree.cond, env, syms.booleanType);
1495 MatchBindings condBindings = matchBindings;
1496 // include condition's bindings when true in the body:
1497 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1498 try {
1499 attribStat(tree.body, whileEnv.dup(tree));
1500 } finally {
1501 whileEnv.info.scope.leave();
1502 }
1503 handleLoopConditionBindings(condBindings, tree, tree.body);
1504 result = null;
1505 }
1506
1507 public void visitForLoop(JCForLoop tree) {
1508 Env<AttrContext> loopEnv =
1509 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1510 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1511 try {
1512 attribStats(tree.init, loopEnv);
1513 if (tree.cond != null) {
1514 attribExpr(tree.cond, loopEnv, syms.booleanType);
1515 // include condition's bindings when true in the body and step:
1516 condBindings = matchBindings;
1517 }
1518 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1519 try {
1520 bodyEnv.tree = tree; // before, we were not in loop!
1521 attribStats(tree.step, bodyEnv);
1522 attribStat(tree.body, bodyEnv);
1523 } finally {
1524 bodyEnv.info.scope.leave();
1525 }
1526 result = null;
1527 }
1528 finally {
1529 loopEnv.info.scope.leave();
1530 }
1531 handleLoopConditionBindings(condBindings, tree, tree.body);
1532 }
1533
1534 /**
1535 * Include condition's bindings when false after the loop, if cannot get out of the loop
1536 */
1537 private void handleLoopConditionBindings(MatchBindings condBindings,
1538 JCStatement loop,
1539 JCStatement loopBody) {
1540 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1541 !breaksTo(env, loop, loopBody)) {
1542 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1543 }
1544 }
1545
1546 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1547 preFlow(body);
1548 return flow.breaksToTree(env, loop, body, make);
1549 }
1550
1551 /**
1552 * Add given bindings to the current scope, unless there's a break to
1553 * an immediately enclosing labeled statement.
1554 */
1555 private void addBindings2Scope(JCStatement introducingStatement,
1556 List<BindingSymbol> bindings) {
1557 if (bindings.isEmpty()) {
1558 return ;
1559 }
1560
1561 var searchEnv = env;
1562 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1563 labeled.body == introducingStatement) {
1564 if (breaksTo(env, labeled, labeled.body)) {
1565 //breaking to an immediately enclosing labeled statement
1566 return ;
1567 }
1568 searchEnv = searchEnv.next;
1569 introducingStatement = labeled;
1570 }
1571
1572 //include condition's body when false after the while, if cannot get out of the loop
1573 bindings.forEach(env.info.scope::enter);
1574 bindings.forEach(BindingSymbol::preserveBinding);
1575 }
1576
1577 public void visitForeachLoop(JCEnhancedForLoop tree) {
1578 Env<AttrContext> loopEnv =
1579 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1580 try {
1581 //the Formal Parameter of a for-each loop is not in the scope when
1582 //attributing the for-each expression; we mimic this by attributing
1583 //the for-each expression first (against original scope).
1584 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1585 chk.checkNonVoid(tree.pos(), exprType);
1586 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1587 if (elemtype == null) {
1588 // or perhaps expr implements Iterable<T>?
1589 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1590 if (base == null) {
1591 log.error(tree.expr.pos(),
1592 Errors.ForeachNotApplicableToType(exprType,
1593 Fragments.TypeReqArrayOrIterable));
1594 elemtype = types.createErrorType(exprType);
1595 } else {
1596 List<Type> iterableParams = base.allparams();
1597 elemtype = iterableParams.isEmpty()
1598 ? syms.objectType
1599 : types.wildUpperBound(iterableParams.head);
1600
1601 // Check the return type of the method iterator().
1602 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1603 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1604 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1605 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1606 log.error(tree.pos(),
1607 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1608 }
1609 }
1610 }
1611 if (tree.var.isImplicitlyTyped()) {
1612 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1613 setSyntheticVariableType(tree.var, inferredType);
1614 }
1615 attribStat(tree.var, loopEnv);
1616 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1617 loopEnv.tree = tree; // before, we were not in loop!
1618 attribStat(tree.body, loopEnv);
1619 result = null;
1620 }
1621 finally {
1622 loopEnv.info.scope.leave();
1623 }
1624 }
1625
1626 public void visitLabelled(JCLabeledStatement tree) {
1627 // Check that label is not used in an enclosing statement
1628 Env<AttrContext> env1 = env;
1629 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1630 if (env1.tree.hasTag(LABELLED) &&
1631 ((JCLabeledStatement) env1.tree).label == tree.label) {
1632 log.error(tree.pos(),
1633 Errors.LabelAlreadyInUse(tree.label));
1634 break;
1635 }
1636 env1 = env1.next;
1637 }
1638
1639 attribStat(tree.body, env.dup(tree));
1640 result = null;
1641 }
1642
1643 public void visitSwitch(JCSwitch tree) {
1644 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1645 attribStats(c.stats, caseEnv);
1646 });
1647 result = null;
1648 }
1649
1650 public void visitSwitchExpression(JCSwitchExpression tree) {
1651 boolean wrongContext = false;
1652
1653 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1654 PolyKind.STANDALONE : PolyKind.POLY;
1655
1656 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1657 //this means we are returning a poly conditional from void-compatible lambda expression
1658 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1659 resultInfo = recoveryInfo;
1660 wrongContext = true;
1661 }
1662
1663 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1664 unknownExprInfo :
1665 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1666
1667 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1668 ListBuffer<Type> caseTypes = new ListBuffer<>();
1669
1670 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1671 caseEnv.info.yieldResult = condInfo;
1672 attribStats(c.stats, caseEnv);
1673 new TreeScanner() {
1674 @Override
1675 public void visitYield(JCYield brk) {
1676 if (brk.target == tree) {
1677 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1678 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1679 }
1680 super.visitYield(brk);
1681 }
1682
1683 @Override public void visitClassDef(JCClassDecl tree) {}
1684 @Override public void visitLambda(JCLambda tree) {}
1685 }.scan(c.stats);
1686 });
1687
1688 if (tree.cases.isEmpty()) {
1689 log.error(tree.pos(),
1690 Errors.SwitchExpressionEmpty);
1691 } else if (caseTypes.isEmpty()) {
1692 log.error(tree.pos(),
1693 Errors.SwitchExpressionNoResultExpressions);
1694 }
1695
1696 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1697
1698 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1699 }
1700 //where:
1701 CheckContext switchExpressionContext(CheckContext checkContext) {
1702 return new Check.NestedCheckContext(checkContext) {
1703 //this will use enclosing check context to check compatibility of
1704 //subexpression against target type; if we are in a method check context,
1705 //depending on whether boxing is allowed, we could have incompatibilities
1706 @Override
1707 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1708 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1709 }
1710 };
1711 }
1712
1713 private void handleSwitch(JCTree switchTree,
1714 JCExpression selector,
1715 List<JCCase> cases,
1716 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1717 Type seltype = attribExpr(selector, env);
1718
1719 Env<AttrContext> switchEnv =
1720 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1721
1722 try {
1723 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1724 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1725 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1726 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1727 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1728 boolean patternSwitch;
1729 if (seltype.isPrimitive() && !intSwitch) {
1730 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1731 patternSwitch = true;
1732 }
1733 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1734 !intSwitch) {
1735 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1736 patternSwitch = true;
1737 } else {
1738 patternSwitch = cases.stream()
1739 .flatMap(c -> c.labels.stream())
1740 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1741 TreeInfo.isNullCaseLabel(l));
1742 }
1743
1744 // Attribute all cases and
1745 // check that there are no duplicate case labels or default clauses.
1746 Set<Object> constants = new HashSet<>(); // The set of case constants.
1747 boolean hasDefault = false; // Is there a default label?
1748 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1749 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1750 boolean hasNullPattern = false; // Is there a null pattern?
1751 CaseTree.CaseKind caseKind = null;
1752 boolean wasError = false;
1753 JCCaseLabel unconditionalCaseLabel = null;
1754 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1755 JCCase c = l.head;
1756 if (caseKind == null) {
1757 caseKind = c.caseKind;
1758 } else if (caseKind != c.caseKind && !wasError) {
1759 log.error(c.pos(),
1760 Errors.SwitchMixingCaseTypes);
1761 wasError = true;
1762 }
1763 MatchBindings currentBindings = null;
1764 MatchBindings guardBindings = null;
1765 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1766 JCCaseLabel label = labels.head;
1767 if (label instanceof JCConstantCaseLabel constLabel) {
1768 JCExpression expr = constLabel.expr;
1769 if (TreeInfo.isNull(expr)) {
1770 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1771 if (hasNullPattern) {
1772 log.error(label.pos(), Errors.DuplicateCaseLabel);
1773 }
1774 hasNullPattern = true;
1775 attribExpr(expr, switchEnv, seltype);
1776 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1777 } else if (enumSwitch) {
1778 Symbol sym = enumConstant(expr, seltype);
1779 if (sym == null) {
1780 if (allowPatternSwitch) {
1781 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1782 Symbol enumSym = TreeInfo.symbol(expr);
1783 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1784 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1785 } else if (!constants.add(enumSym)) {
1786 log.error(label.pos(), Errors.DuplicateCaseLabel);
1787 }
1788 } else {
1789 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1790 }
1791 } else if (!constants.add(sym)) {
1792 log.error(label.pos(), Errors.DuplicateCaseLabel);
1793 }
1794 } else if (errorEnumSwitch) {
1795 //error recovery: the selector is erroneous, and all the case labels
1796 //are identifiers. This could be an enum switch - don't report resolve
1797 //error for the case label:
1798 var prevResolveHelper = rs.basicLogResolveHelper;
1799 try {
1800 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1801 attribExpr(expr, switchEnv, seltype);
1802 } finally {
1803 rs.basicLogResolveHelper = prevResolveHelper;
1804 }
1805 } else {
1806 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1807 if (!pattype.hasTag(ERROR)) {
1808 if (pattype.constValue() == null) {
1809 Symbol s = TreeInfo.symbol(expr);
1810 if (s != null && s.kind == TYP) {
1811 log.error(expr.pos(),
1812 Errors.PatternExpected);
1813 } else if (s == null || !s.isEnum()) {
1814 log.error(expr.pos(),
1815 (stringSwitch ? Errors.StringConstReq
1816 : intSwitch ? Errors.ConstExprReq
1817 : Errors.PatternOrEnumReq));
1818 } else if (!constants.add(s)) {
1819 log.error(label.pos(), Errors.DuplicateCaseLabel);
1820 }
1821 }
1822 else {
1823 if (!stringSwitch && !intSwitch &&
1824 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1825 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1826 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1827 } else if (!constants.add(pattype.constValue())) {
1828 log.error(c.pos(), Errors.DuplicateCaseLabel);
1829 }
1830 }
1831 }
1832 }
1833 } else if (label instanceof JCDefaultCaseLabel def) {
1834 if (hasDefault) {
1835 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1836 } else if (hasUnconditionalPattern) {
1837 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1838 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1839 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1840 }
1841 hasDefault = true;
1842 matchBindings = MatchBindingsComputer.EMPTY;
1843 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1844 //pattern
1845 JCPattern pat = patternlabel.pat;
1846 attribExpr(pat, switchEnv, seltype);
1847 Type primaryType = TreeInfo.primaryPatternType(pat);
1848
1849 if (primaryType.isPrimitive()) {
1850 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1851 } else if (!primaryType.hasTag(TYPEVAR)) {
1852 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1853 }
1854 checkCastablePattern(pat.pos(), seltype, primaryType);
1855 Type patternType = types.erasure(primaryType);
1856 JCExpression guard = c.guard;
1857 if (guardBindings == null && guard != null) {
1858 MatchBindings afterPattern = matchBindings;
1859 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1860 try {
1861 attribExpr(guard, bodyEnv, syms.booleanType);
1862 } finally {
1863 bodyEnv.info.scope.leave();
1864 }
1865
1866 guardBindings = matchBindings;
1867 matchBindings = afterPattern;
1868
1869 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1870 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1871 }
1872 }
1873 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1874 boolean unconditional =
1875 unguarded &&
1876 !patternType.isErroneous() &&
1877 types.isUnconditionallyExact(seltype, patternType);
1878 if (unconditional) {
1879 if (hasUnconditionalPattern) {
1880 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1881 } else if (hasDefault) {
1882 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1883 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1884 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1885 }
1886 hasUnconditionalPattern = true;
1887 unconditionalCaseLabel = label;
1888 }
1889 lastPatternErroneous = patternType.isErroneous();
1890 } else {
1891 Assert.error();
1892 }
1893 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1894 }
1895
1896 if (guardBindings != null) {
1897 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1898 }
1899
1900 Env<AttrContext> caseEnv =
1901 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1902 try {
1903 attribCase.accept(c, caseEnv);
1904 } finally {
1905 caseEnv.info.scope.leave();
1906 }
1907 addVars(c.stats, switchEnv.info.scope);
1908
1909 preFlow(c);
1910 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1911 }
1912 if (patternSwitch) {
1913 chk.checkSwitchCaseStructure(cases);
1914 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1915 }
1916 if (switchTree.hasTag(SWITCH)) {
1917 ((JCSwitch) switchTree).hasUnconditionalPattern =
1918 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1919 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1920 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1921 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1922 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1923 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1924 } else {
1925 Assert.error(switchTree.getTag().name());
1926 }
1927 } finally {
1928 switchEnv.info.scope.leave();
1929 }
1930 }
1931 // where
1932 private ResultInfo caseLabelResultInfo(Type seltype) {
1933 return new ResultInfo(KindSelector.VAL_TYP,
1934 !seltype.hasTag(ERROR) ? seltype
1935 : Type.noType);
1936 }
1937 /** Add any variables defined in stats to the switch scope. */
1938 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1939 for (;stats.nonEmpty(); stats = stats.tail) {
1940 JCTree stat = stats.head;
1941 if (stat.hasTag(VARDEF))
1942 switchScope.enter(((JCVariableDecl) stat).sym);
1943 }
1944 }
1945 // where
1946 /** Return the selected enumeration constant symbol, or null. */
1947 private Symbol enumConstant(JCTree tree, Type enumType) {
1948 if (tree.hasTag(IDENT)) {
1949 JCIdent ident = (JCIdent)tree;
1950 Name name = ident.name;
1951 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1952 if (sym.kind == VAR) {
1953 Symbol s = ident.sym = sym;
1954 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1955 ident.type = s.type;
1956 return ((s.flags_field & Flags.ENUM) == 0)
1957 ? null : s;
1958 }
1959 }
1960 }
1961 return null;
1962 }
1963
1964 public void visitSynchronized(JCSynchronized tree) {
1965 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1966 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) &&
1967 identityType &&
1968 isValueBased(tree.lock.type)) {
1969 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1970 }
1971 attribStat(tree.body, env);
1972 result = null;
1973 }
1974 // where
1975 private boolean isValueBased(Type t) {
1976 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1977 }
1978
1979 public void visitTry(JCTry tree) {
1980 // Create a new local environment with a local
1981 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1982 try {
1983 boolean isTryWithResource = tree.resources.nonEmpty();
1984 // Create a nested environment for attributing the try block if needed
1985 Env<AttrContext> tryEnv = isTryWithResource ?
1986 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1987 localEnv;
1988 try {
1989 // Attribute resource declarations
1990 for (JCTree resource : tree.resources) {
1991 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1992 @Override
1993 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1994 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1995 }
1996 };
1997 ResultInfo twrResult =
1998 new ResultInfo(KindSelector.VAR,
1999 syms.autoCloseableType,
2000 twrContext);
2001 if (resource.hasTag(VARDEF)) {
2002 attribStat(resource, tryEnv);
2003 twrResult.check(resource, resource.type);
2004
2005 //check that resource type cannot throw InterruptedException
2006 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2007
2008 VarSymbol var = ((JCVariableDecl) resource).sym;
2009
2010 var.flags_field |= Flags.FINAL;
2011 var.setData(ElementKind.RESOURCE_VARIABLE);
2012 } else {
2013 attribTree(resource, tryEnv, twrResult);
2014 }
2015 }
2016 // Attribute body
2017 attribStat(tree.body, tryEnv);
2018 } finally {
2019 if (isTryWithResource)
2020 tryEnv.info.scope.leave();
2021 }
2022
2023 // Attribute catch clauses
2024 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2025 JCCatch c = l.head;
2026 Env<AttrContext> catchEnv =
2027 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2028 try {
2029 Type ctype = attribStat(c.param, catchEnv);
2030 if (TreeInfo.isMultiCatch(c)) {
2031 //multi-catch parameter is implicitly marked as final
2032 c.param.sym.flags_field |= FINAL | UNION;
2033 }
2034 if (c.param.sym.kind == VAR) {
2035 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2036 }
2037 chk.checkType(c.param.vartype.pos(),
2038 chk.checkClassType(c.param.vartype.pos(), ctype),
2039 syms.throwableType);
2040 attribStat(c.body, catchEnv);
2041 } finally {
2042 catchEnv.info.scope.leave();
2043 }
2044 }
2045
2046 // Attribute finalizer
2047 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2048 result = null;
2049 }
2050 finally {
2051 localEnv.info.scope.leave();
2052 }
2053 }
2054
2055 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2056 if (!resource.isErroneous() &&
2057 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2058 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2059 Symbol close = syms.noSymbol;
2060 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2061 try {
2062 close = rs.resolveQualifiedMethod(pos,
2063 env,
2064 types.skipTypeVars(resource, false),
2065 names.close,
2066 List.nil(),
2067 List.nil());
2068 }
2069 finally {
2070 log.popDiagnosticHandler(discardHandler);
2071 }
2072 if (close.kind == MTH &&
2073 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2074 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2075 env.info.lint.isEnabled(LintCategory.TRY)) {
2076 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2077 }
2078 }
2079 }
2080
2081 public void visitConditional(JCConditional tree) {
2082 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2083 MatchBindings condBindings = matchBindings;
2084
2085 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2086 isBooleanOrNumeric(env, tree)) ?
2087 PolyKind.STANDALONE : PolyKind.POLY;
2088
2089 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2090 //this means we are returning a poly conditional from void-compatible lambda expression
2091 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2092 result = tree.type = types.createErrorType(resultInfo.pt);
2093 return;
2094 }
2095
2096 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2097 unknownExprInfo :
2098 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2099
2100
2101 // x ? y : z
2102 // include x's bindings when true in y
2103 // include x's bindings when false in z
2104
2105 Type truetype;
2106 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2107 try {
2108 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2109 } finally {
2110 trueEnv.info.scope.leave();
2111 }
2112
2113 MatchBindings trueBindings = matchBindings;
2114
2115 Type falsetype;
2116 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2117 try {
2118 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2119 } finally {
2120 falseEnv.info.scope.leave();
2121 }
2122
2123 MatchBindings falseBindings = matchBindings;
2124
2125 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2126 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2127 List.of(truetype, falsetype)) : pt();
2128 if (condtype.constValue() != null &&
2129 truetype.constValue() != null &&
2130 falsetype.constValue() != null &&
2131 !owntype.hasTag(NONE)) {
2132 //constant folding
2133 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2134 }
2135 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2136 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2137 }
2138 //where
2139 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2140 switch (tree.getTag()) {
2141 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2142 ((JCLiteral)tree).typetag == BOOLEAN ||
2143 ((JCLiteral)tree).typetag == BOT;
2144 case LAMBDA: case REFERENCE: return false;
2145 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2146 case CONDEXPR:
2147 JCConditional condTree = (JCConditional)tree;
2148 return isBooleanOrNumeric(env, condTree.truepart) &&
2149 isBooleanOrNumeric(env, condTree.falsepart);
2150 case APPLY:
2151 JCMethodInvocation speculativeMethodTree =
2152 (JCMethodInvocation)deferredAttr.attribSpeculative(
2153 tree, env, unknownExprInfo,
2154 argumentAttr.withLocalCacheContext());
2155 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2156 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2157 env.enclClass.type :
2158 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2159 Type owntype = types.memberType(receiverType, msym).getReturnType();
2160 return primitiveOrBoxed(owntype);
2161 case NEWCLASS:
2162 JCExpression className =
2163 removeClassParams.translate(((JCNewClass)tree).clazz);
2164 JCExpression speculativeNewClassTree =
2165 (JCExpression)deferredAttr.attribSpeculative(
2166 className, env, unknownTypeInfo,
2167 argumentAttr.withLocalCacheContext());
2168 return primitiveOrBoxed(speculativeNewClassTree.type);
2169 default:
2170 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2171 argumentAttr.withLocalCacheContext()).type;
2172 return primitiveOrBoxed(speculativeType);
2173 }
2174 }
2175 //where
2176 boolean primitiveOrBoxed(Type t) {
2177 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2178 }
2179
2180 TreeTranslator removeClassParams = new TreeTranslator() {
2181 @Override
2182 public void visitTypeApply(JCTypeApply tree) {
2183 result = translate(tree.clazz);
2184 }
2185 };
2186
2187 CheckContext conditionalContext(CheckContext checkContext) {
2188 return new Check.NestedCheckContext(checkContext) {
2189 //this will use enclosing check context to check compatibility of
2190 //subexpression against target type; if we are in a method check context,
2191 //depending on whether boxing is allowed, we could have incompatibilities
2192 @Override
2193 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2194 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2195 }
2196 };
2197 }
2198
2199 /** Compute the type of a conditional expression, after
2200 * checking that it exists. See JLS 15.25. Does not take into
2201 * account the special case where condition and both arms
2202 * are constants.
2203 *
2204 * @param pos The source position to be used for error
2205 * diagnostics.
2206 * @param thentype The type of the expression's then-part.
2207 * @param elsetype The type of the expression's else-part.
2208 */
2209 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2210 if (condTypes.isEmpty()) {
2211 return syms.objectType; //TODO: how to handle?
2212 }
2213 Type first = condTypes.head;
2214 // If same type, that is the result
2215 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2216 return first.baseType();
2217
2218 List<Type> unboxedTypes = condTypes.stream()
2219 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2220 .collect(List.collector());
2221
2222 // Otherwise, if both arms can be converted to a numeric
2223 // type, return the least numeric type that fits both arms
2224 // (i.e. return larger of the two, or return int if one
2225 // arm is short, the other is char).
2226 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2227 // If one arm has an integer subrange type (i.e., byte,
2228 // short, or char), and the other is an integer constant
2229 // that fits into the subrange, return the subrange type.
2230 for (Type type : unboxedTypes) {
2231 if (!type.getTag().isStrictSubRangeOf(INT)) {
2232 continue;
2233 }
2234 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2235 return type.baseType();
2236 }
2237
2238 for (TypeTag tag : primitiveTags) {
2239 Type candidate = syms.typeOfTag[tag.ordinal()];
2240 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2241 return candidate;
2242 }
2243 }
2244 }
2245
2246 // Those were all the cases that could result in a primitive
2247 condTypes = condTypes.stream()
2248 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2249 .collect(List.collector());
2250
2251 for (Type type : condTypes) {
2252 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2253 return type.baseType();
2254 }
2255
2256 Iterator<DiagnosticPosition> posIt = positions.iterator();
2257
2258 condTypes = condTypes.stream()
2259 .map(t -> chk.checkNonVoid(posIt.next(), t))
2260 .collect(List.collector());
2261
2262 // both are known to be reference types. The result is
2263 // lub(thentype,elsetype). This cannot fail, as it will
2264 // always be possible to infer "Object" if nothing better.
2265 return types.lub(condTypes.stream()
2266 .map(t -> t.baseType())
2267 .filter(t -> !t.hasTag(BOT))
2268 .collect(List.collector()));
2269 }
2270
2271 static final TypeTag[] primitiveTags = new TypeTag[]{
2272 BYTE,
2273 CHAR,
2274 SHORT,
2275 INT,
2276 LONG,
2277 FLOAT,
2278 DOUBLE,
2279 BOOLEAN,
2280 };
2281
2282 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2283 return bindingEnv(env, env.tree, bindings);
2284 }
2285
2286 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2287 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2288 bindings.forEach(env1.info.scope::enter);
2289 return env1;
2290 }
2291
2292 public void visitIf(JCIf tree) {
2293 attribExpr(tree.cond, env, syms.booleanType);
2294
2295 // if (x) { y } [ else z ]
2296 // include x's bindings when true in y
2297 // include x's bindings when false in z
2298
2299 MatchBindings condBindings = matchBindings;
2300 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2301
2302 try {
2303 attribStat(tree.thenpart, thenEnv);
2304 } finally {
2305 thenEnv.info.scope.leave();
2306 }
2307
2308 preFlow(tree.thenpart);
2309 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2310 boolean aliveAfterElse;
2311
2312 if (tree.elsepart != null) {
2313 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2314 try {
2315 attribStat(tree.elsepart, elseEnv);
2316 } finally {
2317 elseEnv.info.scope.leave();
2318 }
2319 preFlow(tree.elsepart);
2320 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2321 } else {
2322 aliveAfterElse = true;
2323 }
2324
2325 chk.checkEmptyIf(tree);
2326
2327 List<BindingSymbol> afterIfBindings = List.nil();
2328
2329 if (aliveAfterThen && !aliveAfterElse) {
2330 afterIfBindings = condBindings.bindingsWhenTrue;
2331 } else if (aliveAfterElse && !aliveAfterThen) {
2332 afterIfBindings = condBindings.bindingsWhenFalse;
2333 }
2334
2335 addBindings2Scope(tree, afterIfBindings);
2336
2337 result = null;
2338 }
2339
2340 void preFlow(JCTree tree) {
2341 attrRecover.doRecovery();
2342 new PostAttrAnalyzer() {
2343 @Override
2344 public void scan(JCTree tree) {
2345 if (tree == null ||
2346 (tree.type != null &&
2347 tree.type == Type.stuckType)) {
2348 //don't touch stuck expressions!
2349 return;
2350 }
2351 super.scan(tree);
2352 }
2353
2354 @Override
2355 public void visitClassDef(JCClassDecl that) {
2356 if (that.sym != null) {
2357 // Method preFlow shouldn't visit class definitions
2358 // that have not been entered and attributed.
2359 // See JDK-8254557 and JDK-8203277 for more details.
2360 super.visitClassDef(that);
2361 }
2362 }
2363
2364 @Override
2365 public void visitLambda(JCLambda that) {
2366 if (that.type != null) {
2367 // Method preFlow shouldn't visit lambda expressions
2368 // that have not been entered and attributed.
2369 // See JDK-8254557 and JDK-8203277 for more details.
2370 super.visitLambda(that);
2371 }
2372 }
2373 }.scan(tree);
2374 }
2375
2376 public void visitExec(JCExpressionStatement tree) {
2377 //a fresh environment is required for 292 inference to work properly ---
2378 //see Infer.instantiatePolymorphicSignatureInstance()
2379 Env<AttrContext> localEnv = env.dup(tree);
2380 attribExpr(tree.expr, localEnv);
2381 result = null;
2382 }
2383
2384 public void visitBreak(JCBreak tree) {
2385 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2386 result = null;
2387 }
2388
2389 public void visitYield(JCYield tree) {
2390 if (env.info.yieldResult != null) {
2391 attribTree(tree.value, env, env.info.yieldResult);
2392 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2393 } else {
2394 log.error(tree.pos(), tree.value.hasTag(PARENS)
2395 ? Errors.NoSwitchExpressionQualify
2396 : Errors.NoSwitchExpression);
2397 attribTree(tree.value, env, unknownExprInfo);
2398 }
2399 result = null;
2400 }
2401
2402 public void visitContinue(JCContinue tree) {
2403 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2404 result = null;
2405 }
2406 //where
2407 /** Return the target of a break, continue or yield statement,
2408 * if it exists, report an error if not.
2409 * Note: The target of a labelled break or continue is the
2410 * (non-labelled) statement tree referred to by the label,
2411 * not the tree representing the labelled statement itself.
2412 *
2413 * @param pos The position to be used for error diagnostics
2414 * @param tag The tag of the jump statement. This is either
2415 * Tree.BREAK or Tree.CONTINUE.
2416 * @param label The label of the jump statement, or null if no
2417 * label is given.
2418 * @param env The environment current at the jump statement.
2419 */
2420 private JCTree findJumpTarget(DiagnosticPosition pos,
2421 JCTree.Tag tag,
2422 Name label,
2423 Env<AttrContext> env) {
2424 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2425
2426 if (jumpTarget.snd != null) {
2427 log.error(pos, jumpTarget.snd);
2428 }
2429
2430 return jumpTarget.fst;
2431 }
2432 /** Return the target of a break or continue statement, if it exists,
2433 * report an error if not.
2434 * Note: The target of a labelled break or continue is the
2435 * (non-labelled) statement tree referred to by the label,
2436 * not the tree representing the labelled statement itself.
2437 *
2438 * @param tag The tag of the jump statement. This is either
2439 * Tree.BREAK or Tree.CONTINUE.
2440 * @param label The label of the jump statement, or null if no
2441 * label is given.
2442 * @param env The environment current at the jump statement.
2443 */
2444 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2445 Name label,
2446 Env<AttrContext> env) {
2447 // Search environments outwards from the point of jump.
2448 Env<AttrContext> env1 = env;
2449 JCDiagnostic.Error pendingError = null;
2450 LOOP:
2451 while (env1 != null) {
2452 switch (env1.tree.getTag()) {
2453 case LABELLED:
2454 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2455 if (label == labelled.label) {
2456 // If jump is a continue, check that target is a loop.
2457 if (tag == CONTINUE) {
2458 if (!labelled.body.hasTag(DOLOOP) &&
2459 !labelled.body.hasTag(WHILELOOP) &&
2460 !labelled.body.hasTag(FORLOOP) &&
2461 !labelled.body.hasTag(FOREACHLOOP)) {
2462 pendingError = Errors.NotLoopLabel(label);
2463 }
2464 // Found labelled statement target, now go inwards
2465 // to next non-labelled tree.
2466 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2467 } else {
2468 return Pair.of(labelled, pendingError);
2469 }
2470 }
2471 break;
2472 case DOLOOP:
2473 case WHILELOOP:
2474 case FORLOOP:
2475 case FOREACHLOOP:
2476 if (label == null) return Pair.of(env1.tree, pendingError);
2477 break;
2478 case SWITCH:
2479 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2480 break;
2481 case SWITCH_EXPRESSION:
2482 if (tag == YIELD) {
2483 return Pair.of(env1.tree, null);
2484 } else if (tag == BREAK) {
2485 pendingError = Errors.BreakOutsideSwitchExpression;
2486 } else {
2487 pendingError = Errors.ContinueOutsideSwitchExpression;
2488 }
2489 break;
2490 case LAMBDA:
2491 case METHODDEF:
2492 case CLASSDEF:
2493 break LOOP;
2494 default:
2495 }
2496 env1 = env1.next;
2497 }
2498 if (label != null)
2499 return Pair.of(null, Errors.UndefLabel(label));
2500 else if (pendingError != null)
2501 return Pair.of(null, pendingError);
2502 else if (tag == CONTINUE)
2503 return Pair.of(null, Errors.ContOutsideLoop);
2504 else
2505 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2506 }
2507
2508 public void visitReturn(JCReturn tree) {
2509 // Check that there is an enclosing method which is
2510 // nested within than the enclosing class.
2511 if (env.info.returnResult == null) {
2512 log.error(tree.pos(), Errors.RetOutsideMeth);
2513 } else if (env.info.yieldResult != null) {
2514 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2515 if (tree.expr != null) {
2516 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2517 }
2518 } else if (!env.info.isLambda &&
2519 !env.info.isNewClass &&
2520 env.enclMethod != null &&
2521 TreeInfo.isCompactConstructor(env.enclMethod)) {
2522 log.error(env.enclMethod,
2523 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2524 } else {
2525 // Attribute return expression, if it exists, and check that
2526 // it conforms to result type of enclosing method.
2527 if (tree.expr != null) {
2528 if (env.info.returnResult.pt.hasTag(VOID)) {
2529 env.info.returnResult.checkContext.report(tree.expr.pos(),
2530 diags.fragment(Fragments.UnexpectedRetVal));
2531 }
2532 attribTree(tree.expr, env, env.info.returnResult);
2533 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2534 !env.info.returnResult.pt.hasTag(NONE)) {
2535 env.info.returnResult.checkContext.report(tree.pos(),
2536 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2537 }
2538 }
2539 result = null;
2540 }
2541
2542 public void visitThrow(JCThrow tree) {
2543 Type owntype = attribExpr(tree.expr, env, Type.noType);
2544 chk.checkType(tree, owntype, syms.throwableType);
2545 result = null;
2546 }
2547
2548 public void visitAssert(JCAssert tree) {
2549 attribExpr(tree.cond, env, syms.booleanType);
2550 if (tree.detail != null) {
2551 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2552 }
2553 result = null;
2554 }
2555
2556 /** Visitor method for method invocations.
2557 * NOTE: The method part of an application will have in its type field
2558 * the return type of the method, not the method's type itself!
2559 */
2560 public void visitApply(JCMethodInvocation tree) {
2561 // The local environment of a method application is
2562 // a new environment nested in the current one.
2563 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2564
2565 // The types of the actual method arguments.
2566 List<Type> argtypes;
2567
2568 // The types of the actual method type arguments.
2569 List<Type> typeargtypes = null;
2570
2571 Name methName = TreeInfo.name(tree.meth);
2572
2573 boolean isConstructorCall =
2574 methName == names._this || methName == names._super;
2575
2576 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2577 if (isConstructorCall) {
2578
2579 // Attribute arguments, yielding list of argument types.
2580 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2581 argtypes = argtypesBuf.toList();
2582 typeargtypes = attribTypes(tree.typeargs, localEnv);
2583
2584 // Done with this()/super() parameters. End of constructor prologue.
2585 env.info.ctorPrologue = false;
2586
2587 // Variable `site' points to the class in which the called
2588 // constructor is defined.
2589 Type site = env.enclClass.sym.type;
2590 if (methName == names._super) {
2591 if (site == syms.objectType) {
2592 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2593 site = types.createErrorType(syms.objectType);
2594 } else {
2595 site = types.supertype(site);
2596 }
2597 }
2598
2599 if (site.hasTag(CLASS)) {
2600 Type encl = site.getEnclosingType();
2601 while (encl != null && encl.hasTag(TYPEVAR))
2602 encl = encl.getUpperBound();
2603 if (encl.hasTag(CLASS)) {
2604 // we are calling a nested class
2605
2606 if (tree.meth.hasTag(SELECT)) {
2607 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2608
2609 // We are seeing a prefixed call, of the form
2610 // <expr>.super(...).
2611 // Check that the prefix expression conforms
2612 // to the outer instance type of the class.
2613 chk.checkRefType(qualifier.pos(),
2614 attribExpr(qualifier, localEnv,
2615 encl));
2616 } else if (methName == names._super) {
2617 // qualifier omitted; check for existence
2618 // of an appropriate implicit qualifier.
2619 rs.resolveImplicitThis(tree.meth.pos(),
2620 localEnv, site, true);
2621 }
2622 } else if (tree.meth.hasTag(SELECT)) {
2623 log.error(tree.meth.pos(),
2624 Errors.IllegalQualNotIcls(site.tsym));
2625 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2626 }
2627
2628 // if we're calling a java.lang.Enum constructor,
2629 // prefix the implicit String and int parameters
2630 if (site.tsym == syms.enumSym)
2631 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2632
2633 // Resolve the called constructor under the assumption
2634 // that we are referring to a superclass instance of the
2635 // current instance (JLS ???).
2636 boolean selectSuperPrev = localEnv.info.selectSuper;
2637 localEnv.info.selectSuper = true;
2638 localEnv.info.pendingResolutionPhase = null;
2639 Symbol sym = rs.resolveConstructor(
2640 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2641 localEnv.info.selectSuper = selectSuperPrev;
2642
2643 // Set method symbol to resolved constructor...
2644 TreeInfo.setSymbol(tree.meth, sym);
2645
2646 // ...and check that it is legal in the current context.
2647 // (this will also set the tree's type)
2648 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2649 checkId(tree.meth, site, sym, localEnv,
2650 new ResultInfo(kind, mpt));
2651 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2652 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2653 }
2654 // Otherwise, `site' is an error type and we do nothing
2655 result = tree.type = syms.voidType;
2656 } else {
2657 // Otherwise, we are seeing a regular method call.
2658 // Attribute the arguments, yielding list of argument types, ...
2659 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2660 argtypes = argtypesBuf.toList();
2661 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2662
2663 // ... and attribute the method using as a prototype a methodtype
2664 // whose formal argument types is exactly the list of actual
2665 // arguments (this will also set the method symbol).
2666 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2667 localEnv.info.pendingResolutionPhase = null;
2668 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2669
2670 // Compute the result type.
2671 Type restype = mtype.getReturnType();
2672 if (restype.hasTag(WILDCARD))
2673 throw new AssertionError(mtype);
2674
2675 Type qualifier = (tree.meth.hasTag(SELECT))
2676 ? ((JCFieldAccess) tree.meth).selected.type
2677 : env.enclClass.sym.type;
2678 Symbol msym = TreeInfo.symbol(tree.meth);
2679 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2680
2681 chk.checkRefTypes(tree.typeargs, typeargtypes);
2682
2683 // Check that value of resulting type is admissible in the
2684 // current context. Also, capture the return type
2685 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2686 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2687 }
2688 chk.validate(tree.typeargs, localEnv);
2689 }
2690 //where
2691 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2692 if (msym != null &&
2693 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2694 methodName == names.getClass &&
2695 argtypes.isEmpty()) {
2696 // as a special case, x.getClass() has type Class<? extends |X|>
2697 return new ClassType(restype.getEnclosingType(),
2698 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2699 BoundKind.EXTENDS,
2700 syms.boundClass)),
2701 restype.tsym,
2702 restype.getMetadata());
2703 } else if (msym != null &&
2704 msym.owner == syms.arrayClass &&
2705 methodName == names.clone &&
2706 types.isArray(qualifierType)) {
2707 // as a special case, array.clone() has a result that is
2708 // the same as static type of the array being cloned
2709 return qualifierType;
2710 } else {
2711 return restype;
2712 }
2713 }
2714
2715 /** Obtain a method type with given argument types.
2716 */
2717 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2718 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2719 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2720 }
2721
2722 public void visitNewClass(final JCNewClass tree) {
2723 Type owntype = types.createErrorType(tree.type);
2724
2725 // The local environment of a class creation is
2726 // a new environment nested in the current one.
2727 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2728
2729 // The anonymous inner class definition of the new expression,
2730 // if one is defined by it.
2731 JCClassDecl cdef = tree.def;
2732
2733 // If enclosing class is given, attribute it, and
2734 // complete class name to be fully qualified
2735 JCExpression clazz = tree.clazz; // Class field following new
2736 JCExpression clazzid; // Identifier in class field
2737 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2738 annoclazzid = null;
2739
2740 if (clazz.hasTag(TYPEAPPLY)) {
2741 clazzid = ((JCTypeApply) clazz).clazz;
2742 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2743 annoclazzid = (JCAnnotatedType) clazzid;
2744 clazzid = annoclazzid.underlyingType;
2745 }
2746 } else {
2747 if (clazz.hasTag(ANNOTATED_TYPE)) {
2748 annoclazzid = (JCAnnotatedType) clazz;
2749 clazzid = annoclazzid.underlyingType;
2750 } else {
2751 clazzid = clazz;
2752 }
2753 }
2754
2755 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2756
2757 if (tree.encl != null) {
2758 // We are seeing a qualified new, of the form
2759 // <expr>.new C <...> (...) ...
2760 // In this case, we let clazz stand for the name of the
2761 // allocated class C prefixed with the type of the qualifier
2762 // expression, so that we can
2763 // resolve it with standard techniques later. I.e., if
2764 // <expr> has type T, then <expr>.new C <...> (...)
2765 // yields a clazz T.C.
2766 Type encltype = chk.checkRefType(tree.encl.pos(),
2767 attribExpr(tree.encl, env));
2768 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2769 // from expr to the combined type, or not? Yes, do this.
2770 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2771 ((JCIdent) clazzid).name);
2772
2773 EndPosTable endPosTable = this.env.toplevel.endPositions;
2774 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2775 if (clazz.hasTag(ANNOTATED_TYPE)) {
2776 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2777 List<JCAnnotation> annos = annoType.annotations;
2778
2779 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2780 clazzid1 = make.at(tree.pos).
2781 TypeApply(clazzid1,
2782 ((JCTypeApply) clazz).arguments);
2783 }
2784
2785 clazzid1 = make.at(tree.pos).
2786 AnnotatedType(annos, clazzid1);
2787 } else if (clazz.hasTag(TYPEAPPLY)) {
2788 clazzid1 = make.at(tree.pos).
2789 TypeApply(clazzid1,
2790 ((JCTypeApply) clazz).arguments);
2791 }
2792
2793 clazz = clazzid1;
2794 }
2795
2796 // Attribute clazz expression and store
2797 // symbol + type back into the attributed tree.
2798 Type clazztype;
2799
2800 try {
2801 env.info.isNewClass = true;
2802 clazztype = TreeInfo.isEnumInit(env.tree) ?
2803 attribIdentAsEnumType(env, (JCIdent)clazz) :
2804 attribType(clazz, env);
2805 } finally {
2806 env.info.isNewClass = false;
2807 }
2808
2809 clazztype = chk.checkDiamond(tree, clazztype);
2810 chk.validate(clazz, localEnv);
2811 if (tree.encl != null) {
2812 // We have to work in this case to store
2813 // symbol + type back into the attributed tree.
2814 tree.clazz.type = clazztype;
2815 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2816 clazzid.type = ((JCIdent) clazzid).sym.type;
2817 if (annoclazzid != null) {
2818 annoclazzid.type = clazzid.type;
2819 }
2820 if (!clazztype.isErroneous()) {
2821 if (cdef != null && clazztype.tsym.isInterface()) {
2822 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2823 } else if (clazztype.tsym.isStatic()) {
2824 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2825 }
2826 }
2827 } else if (!clazztype.tsym.isInterface() &&
2828 (clazztype.tsym.flags_field & NOOUTERTHIS) == 0 &&
2829 clazztype.getEnclosingType().hasTag(CLASS)) {
2830 // Check for the existence of an apropos outer instance
2831 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2832 }
2833
2834 // Attribute constructor arguments.
2835 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2836 final KindSelector pkind =
2837 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2838 List<Type> argtypes = argtypesBuf.toList();
2839 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2840
2841 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2842 // Enums may not be instantiated except implicitly
2843 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2844 (!env.tree.hasTag(VARDEF) ||
2845 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2846 ((JCVariableDecl) env.tree).init != tree))
2847 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2848
2849 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2850 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2851 boolean skipNonDiamondPath = false;
2852 // Check that class is not abstract
2853 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2854 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2855 log.error(tree.pos(),
2856 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2857 skipNonDiamondPath = true;
2858 } else if (cdef != null && clazztype.tsym.isInterface()) {
2859 // Check that no constructor arguments are given to
2860 // anonymous classes implementing an interface
2861 if (!argtypes.isEmpty())
2862 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2863
2864 if (!typeargtypes.isEmpty())
2865 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2866
2867 // Error recovery: pretend no arguments were supplied.
2868 argtypes = List.nil();
2869 typeargtypes = List.nil();
2870 skipNonDiamondPath = true;
2871 }
2872 if (TreeInfo.isDiamond(tree)) {
2873 ClassType site = new ClassType(clazztype.getEnclosingType(),
2874 clazztype.tsym.type.getTypeArguments(),
2875 clazztype.tsym,
2876 clazztype.getMetadata());
2877
2878 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2879 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2880 diamondEnv.info.pendingResolutionPhase = null;
2881
2882 //if the type of the instance creation expression is a class type
2883 //apply method resolution inference (JLS 15.12.2.7). The return type
2884 //of the resolved constructor will be a partially instantiated type
2885 Symbol constructor = rs.resolveDiamond(tree.pos(),
2886 diamondEnv,
2887 site,
2888 argtypes,
2889 typeargtypes);
2890 tree.constructor = constructor.baseSymbol();
2891
2892 final TypeSymbol csym = clazztype.tsym;
2893 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2894 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2895 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2896 constructorType = checkId(tree, site,
2897 constructor,
2898 diamondEnv,
2899 diamondResult);
2900
2901 tree.clazz.type = types.createErrorType(clazztype);
2902 if (!constructorType.isErroneous()) {
2903 tree.clazz.type = clazz.type = constructorType.getReturnType();
2904 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2905 }
2906 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2907 }
2908
2909 // Resolve the called constructor under the assumption
2910 // that we are referring to a superclass instance of the
2911 // current instance (JLS ???).
2912 else if (!skipNonDiamondPath) {
2913 //the following code alters some of the fields in the current
2914 //AttrContext - hence, the current context must be dup'ed in
2915 //order to avoid downstream failures
2916 Env<AttrContext> rsEnv = localEnv.dup(tree);
2917 rsEnv.info.selectSuper = cdef != null;
2918 rsEnv.info.pendingResolutionPhase = null;
2919 tree.constructor = rs.resolveConstructor(
2920 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2921 if (cdef == null) { //do not check twice!
2922 tree.constructorType = checkId(tree,
2923 clazztype,
2924 tree.constructor,
2925 rsEnv,
2926 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2927 if (rsEnv.info.lastResolveVarargs())
2928 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2929 }
2930 }
2931
2932 if (cdef != null) {
2933 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2934 return;
2935 }
2936
2937 if (tree.constructor != null && tree.constructor.kind == MTH)
2938 owntype = clazztype;
2939 }
2940 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2941 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2942 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2943 //we need to wait for inference to finish and then replace inference vars in the constructor type
2944 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2945 instantiatedContext -> {
2946 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2947 });
2948 }
2949 chk.validate(tree.typeargs, localEnv);
2950 }
2951
2952 // where
2953 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2954 JCClassDecl cdef, Env<AttrContext> localEnv,
2955 List<Type> argtypes, List<Type> typeargtypes,
2956 KindSelector pkind) {
2957 // We are seeing an anonymous class instance creation.
2958 // In this case, the class instance creation
2959 // expression
2960 //
2961 // E.new <typeargs1>C<typargs2>(args) { ... }
2962 //
2963 // is represented internally as
2964 //
2965 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2966 //
2967 // This expression is then *transformed* as follows:
2968 //
2969 // (1) add an extends or implements clause
2970 // (2) add a constructor.
2971 //
2972 // For instance, if C is a class, and ET is the type of E,
2973 // the expression
2974 //
2975 // E.new <typeargs1>C<typargs2>(args) { ... }
2976 //
2977 // is translated to (where X is a fresh name and typarams is the
2978 // parameter list of the super constructor):
2979 //
2980 // new <typeargs1>X(<*nullchk*>E, args) where
2981 // X extends C<typargs2> {
2982 // <typarams> X(ET e, args) {
2983 // e.<typeargs1>super(args)
2984 // }
2985 // ...
2986 // }
2987 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2988 Type enclType = clazztype.getEnclosingType();
2989 if (enclType != null &&
2990 enclType.hasTag(CLASS) &&
2991 !chk.checkDenotable((ClassType)enclType)) {
2992 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2993 }
2994 final boolean isDiamond = TreeInfo.isDiamond(tree);
2995 if (isDiamond
2996 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2997 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2998 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2999 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3000 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3001 instantiatedContext -> {
3002 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3003 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3004 ResultInfo prevResult = this.resultInfo;
3005 try {
3006 this.resultInfo = resultInfoForClassDefinition;
3007 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3008 dupLocalEnv, argtypes, typeargtypes, pkind);
3009 } finally {
3010 this.resultInfo = prevResult;
3011 }
3012 });
3013 } else {
3014 if (isDiamond && clazztype.hasTag(CLASS)) {
3015 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3016 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3017 // One or more types inferred in the previous steps is non-denotable.
3018 Fragment fragment = Diamond(clazztype.tsym);
3019 log.error(tree.clazz.pos(),
3020 Errors.CantApplyDiamond1(
3021 fragment,
3022 invalidDiamondArgs.size() > 1 ?
3023 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3024 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3025 }
3026 // For <>(){}, inferred types must also be accessible.
3027 for (Type t : clazztype.getTypeArguments()) {
3028 rs.checkAccessibleType(env, t);
3029 }
3030 }
3031
3032 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3033 // false for isInterface call even when the original type is an interface.
3034 boolean implementing = clazztype.tsym.isInterface() ||
3035 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3036 clazztype.getOriginalType().tsym.isInterface();
3037
3038 if (implementing) {
3039 cdef.implementing = List.of(clazz);
3040 } else {
3041 cdef.extending = clazz;
3042 }
3043
3044 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3045 rs.isSerializable(clazztype)) {
3046 localEnv.info.isSerializable = true;
3047 }
3048
3049 attribStat(cdef, localEnv);
3050
3051 List<Type> finalargtypes;
3052 // If an outer instance is given,
3053 // prefix it to the constructor arguments
3054 // and delete it from the new expression
3055 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3056 finalargtypes = argtypes.prepend(tree.encl.type);
3057 } else {
3058 finalargtypes = argtypes;
3059 }
3060
3061 // Reassign clazztype and recompute constructor. As this necessarily involves
3062 // another attribution pass for deferred types in the case of <>, replicate
3063 // them. Original arguments have right decorations already.
3064 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3065 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3066 }
3067
3068 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3069 : cdef.sym.type;
3070 Symbol sym = tree.constructor = rs.resolveConstructor(
3071 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3072 Assert.check(!sym.kind.isResolutionError());
3073 tree.constructor = sym;
3074 tree.constructorType = checkId(tree,
3075 clazztype,
3076 tree.constructor,
3077 localEnv,
3078 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3079 }
3080 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3081 clazztype : types.createErrorType(tree.type);
3082 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3083 chk.validate(tree.typeargs, localEnv);
3084 }
3085
3086 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3087 return new Check.NestedCheckContext(checkContext) {
3088 @Override
3089 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3090 enclosingContext.report(clazz.clazz,
3091 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3092 }
3093 };
3094 }
3095
3096 /** Make an attributed null check tree.
3097 */
3098 public JCExpression makeNullCheck(JCExpression arg) {
3099 // optimization: new Outer() can never be null; skip null check
3100 if (arg.getTag() == NEWCLASS)
3101 return arg;
3102 // optimization: X.this is never null; skip null check
3103 Name name = TreeInfo.name(arg);
3104 if (name == names._this || name == names._super) return arg;
3105
3106 JCTree.Tag optag = NULLCHK;
3107 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3108 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3109 tree.type = arg.type;
3110 return tree;
3111 }
3112
3113 public void visitNewArray(JCNewArray tree) {
3114 Type owntype = types.createErrorType(tree.type);
3115 Env<AttrContext> localEnv = env.dup(tree);
3116 Type elemtype;
3117 if (tree.elemtype != null) {
3118 elemtype = attribType(tree.elemtype, localEnv);
3119 chk.validate(tree.elemtype, localEnv);
3120 owntype = elemtype;
3121 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3122 attribExpr(l.head, localEnv, syms.intType);
3123 owntype = new ArrayType(owntype, syms.arrayClass);
3124 }
3125 } else {
3126 // we are seeing an untyped aggregate { ... }
3127 // this is allowed only if the prototype is an array
3128 if (pt().hasTag(ARRAY)) {
3129 elemtype = types.elemtype(pt());
3130 } else {
3131 if (!pt().hasTag(ERROR) &&
3132 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3133 log.error(tree.pos(),
3134 Errors.IllegalInitializerForType(pt()));
3135 }
3136 elemtype = types.createErrorType(pt());
3137 }
3138 }
3139 if (tree.elems != null) {
3140 attribExprs(tree.elems, localEnv, elemtype);
3141 owntype = new ArrayType(elemtype, syms.arrayClass);
3142 }
3143 if (!types.isReifiable(elemtype))
3144 log.error(tree.pos(), Errors.GenericArrayCreation);
3145 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3146 }
3147
3148 /*
3149 * A lambda expression can only be attributed when a target-type is available.
3150 * In addition, if the target-type is that of a functional interface whose
3151 * descriptor contains inference variables in argument position the lambda expression
3152 * is 'stuck' (see DeferredAttr).
3153 */
3154 @Override
3155 public void visitLambda(final JCLambda that) {
3156 boolean wrongContext = false;
3157 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3158 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3159 //lambda only allowed in assignment or method invocation/cast context
3160 log.error(that.pos(), Errors.UnexpectedLambda);
3161 }
3162 resultInfo = recoveryInfo;
3163 wrongContext = true;
3164 }
3165 //create an environment for attribution of the lambda expression
3166 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3167 boolean needsRecovery =
3168 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3169 try {
3170 if (needsRecovery && rs.isSerializable(pt())) {
3171 localEnv.info.isSerializable = true;
3172 localEnv.info.isSerializableLambda = true;
3173 }
3174 List<Type> explicitParamTypes = null;
3175 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3176 //attribute lambda parameters
3177 attribStats(that.params, localEnv);
3178 explicitParamTypes = TreeInfo.types(that.params);
3179 }
3180
3181 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3182 Type currentTarget = targetInfo.target;
3183 Type lambdaType = targetInfo.descriptor;
3184
3185 if (currentTarget.isErroneous()) {
3186 result = that.type = currentTarget;
3187 return;
3188 }
3189
3190 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3191
3192 if (lambdaType.hasTag(FORALL)) {
3193 //lambda expression target desc cannot be a generic method
3194 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3195 kindName(currentTarget.tsym),
3196 currentTarget.tsym);
3197 resultInfo.checkContext.report(that, diags.fragment(msg));
3198 result = that.type = types.createErrorType(pt());
3199 return;
3200 }
3201
3202 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3203 //add param type info in the AST
3204 List<Type> actuals = lambdaType.getParameterTypes();
3205 List<JCVariableDecl> params = that.params;
3206
3207 boolean arityMismatch = false;
3208
3209 while (params.nonEmpty()) {
3210 if (actuals.isEmpty()) {
3211 //not enough actuals to perform lambda parameter inference
3212 arityMismatch = true;
3213 }
3214 //reset previously set info
3215 Type argType = arityMismatch ?
3216 syms.errType :
3217 actuals.head;
3218 if (params.head.isImplicitlyTyped()) {
3219 setSyntheticVariableType(params.head, argType);
3220 }
3221 params.head.sym = null;
3222 actuals = actuals.isEmpty() ?
3223 actuals :
3224 actuals.tail;
3225 params = params.tail;
3226 }
3227
3228 //attribute lambda parameters
3229 attribStats(that.params, localEnv);
3230
3231 if (arityMismatch) {
3232 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3233 result = that.type = types.createErrorType(currentTarget);
3234 return;
3235 }
3236 }
3237
3238 //from this point on, no recovery is needed; if we are in assignment context
3239 //we will be able to attribute the whole lambda body, regardless of errors;
3240 //if we are in a 'check' method context, and the lambda is not compatible
3241 //with the target-type, it will be recovered anyway in Attr.checkId
3242 needsRecovery = false;
3243
3244 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3245 lambdaBodyResult(that, lambdaType, resultInfo);
3246
3247 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3248 attribTree(that.getBody(), localEnv, bodyResultInfo);
3249 } else {
3250 JCBlock body = (JCBlock)that.body;
3251 if (body == breakTree &&
3252 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3253 breakTreeFound(copyEnv(localEnv));
3254 }
3255 attribStats(body.stats, localEnv);
3256 }
3257
3258 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3259
3260 boolean isSpeculativeRound =
3261 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3262
3263 preFlow(that);
3264 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3265
3266 that.type = currentTarget; //avoids recovery at this stage
3267 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3268
3269 if (!isSpeculativeRound) {
3270 //add thrown types as bounds to the thrown types free variables if needed:
3271 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3272 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3273 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3274 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3275 }
3276 }
3277
3278 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3279 }
3280 result = wrongContext ? that.type = types.createErrorType(pt())
3281 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3282 } catch (Types.FunctionDescriptorLookupError ex) {
3283 JCDiagnostic cause = ex.getDiagnostic();
3284 resultInfo.checkContext.report(that, cause);
3285 result = that.type = types.createErrorType(pt());
3286 return;
3287 } catch (CompletionFailure cf) {
3288 chk.completionError(that.pos(), cf);
3289 } catch (Throwable t) {
3290 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3291 //as that would likely cause the same exception again.
3292 needsRecovery = false;
3293 throw t;
3294 } finally {
3295 localEnv.info.scope.leave();
3296 if (needsRecovery) {
3297 Type prevResult = result;
3298 try {
3299 attribTree(that, env, recoveryInfo);
3300 } finally {
3301 if (result == Type.recoveryType) {
3302 result = prevResult;
3303 }
3304 }
3305 }
3306 }
3307 }
3308 //where
3309 class TargetInfo {
3310 Type target;
3311 Type descriptor;
3312
3313 public TargetInfo(Type target, Type descriptor) {
3314 this.target = target;
3315 this.descriptor = descriptor;
3316 }
3317 }
3318
3319 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3320 Type lambdaType;
3321 Type currentTarget = resultInfo.pt;
3322 if (resultInfo.pt != Type.recoveryType) {
3323 /* We need to adjust the target. If the target is an
3324 * intersection type, for example: SAM & I1 & I2 ...
3325 * the target will be updated to SAM
3326 */
3327 currentTarget = targetChecker.visit(currentTarget, that);
3328 if (!currentTarget.isIntersection()) {
3329 if (explicitParamTypes != null) {
3330 currentTarget = infer.instantiateFunctionalInterface(that,
3331 currentTarget, explicitParamTypes, resultInfo.checkContext);
3332 }
3333 currentTarget = types.removeWildcards(currentTarget);
3334 lambdaType = types.findDescriptorType(currentTarget);
3335 } else {
3336 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3337 ListBuffer<Type> components = new ListBuffer<>();
3338 for (Type bound : ict.getExplicitComponents()) {
3339 if (explicitParamTypes != null) {
3340 try {
3341 bound = infer.instantiateFunctionalInterface(that,
3342 bound, explicitParamTypes, resultInfo.checkContext);
3343 } catch (FunctionDescriptorLookupError t) {
3344 // do nothing
3345 }
3346 }
3347 bound = types.removeWildcards(bound);
3348 components.add(bound);
3349 }
3350 currentTarget = types.makeIntersectionType(components.toList());
3351 currentTarget.tsym.flags_field |= INTERFACE;
3352 lambdaType = types.findDescriptorType(currentTarget);
3353 }
3354
3355 } else {
3356 currentTarget = Type.recoveryType;
3357 lambdaType = fallbackDescriptorType(that);
3358 }
3359 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3360 //lambda expression target desc cannot be a generic method
3361 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3362 kindName(currentTarget.tsym),
3363 currentTarget.tsym);
3364 resultInfo.checkContext.report(that, diags.fragment(msg));
3365 currentTarget = types.createErrorType(pt());
3366 }
3367 return new TargetInfo(currentTarget, lambdaType);
3368 }
3369
3370 void preFlow(JCLambda tree) {
3371 attrRecover.doRecovery();
3372 new PostAttrAnalyzer() {
3373 @Override
3374 public void scan(JCTree tree) {
3375 if (tree == null ||
3376 (tree.type != null &&
3377 tree.type == Type.stuckType)) {
3378 //don't touch stuck expressions!
3379 return;
3380 }
3381 super.scan(tree);
3382 }
3383
3384 @Override
3385 public void visitClassDef(JCClassDecl that) {
3386 // or class declaration trees!
3387 }
3388
3389 public void visitLambda(JCLambda that) {
3390 // or lambda expressions!
3391 }
3392 }.scan(tree.body);
3393 }
3394
3395 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3396
3397 @Override
3398 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3399 return t.isIntersection() ?
3400 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3401 }
3402
3403 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3404 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3405 return ict;
3406 }
3407
3408 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3409 ListBuffer<Type> targs = new ListBuffer<>();
3410 ListBuffer<Type> supertypes = new ListBuffer<>();
3411 for (Type i : ict.interfaces_field) {
3412 if (i.isParameterized()) {
3413 targs.appendList(i.tsym.type.allparams());
3414 }
3415 supertypes.append(i.tsym.type);
3416 }
3417 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3418 notionalIntf.allparams_field = targs.toList();
3419 notionalIntf.tsym.flags_field |= INTERFACE;
3420 return notionalIntf.tsym;
3421 }
3422 };
3423
3424 private Type fallbackDescriptorType(JCExpression tree) {
3425 switch (tree.getTag()) {
3426 case LAMBDA:
3427 JCLambda lambda = (JCLambda)tree;
3428 List<Type> argtypes = List.nil();
3429 for (JCVariableDecl param : lambda.params) {
3430 argtypes = param.vartype != null && param.vartype.type != null ?
3431 argtypes.append(param.vartype.type) :
3432 argtypes.append(syms.errType);
3433 }
3434 return new MethodType(argtypes, Type.recoveryType,
3435 List.of(syms.throwableType), syms.methodClass);
3436 case REFERENCE:
3437 return new MethodType(List.nil(), Type.recoveryType,
3438 List.of(syms.throwableType), syms.methodClass);
3439 default:
3440 Assert.error("Cannot get here!");
3441 }
3442 return null;
3443 }
3444
3445 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3446 final InferenceContext inferenceContext, final Type... ts) {
3447 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3448 }
3449
3450 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3451 final InferenceContext inferenceContext, final List<Type> ts) {
3452 if (inferenceContext.free(ts)) {
3453 inferenceContext.addFreeTypeListener(ts,
3454 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3455 } else {
3456 for (Type t : ts) {
3457 rs.checkAccessibleType(env, t);
3458 }
3459 }
3460 }
3461
3462 /**
3463 * Lambda/method reference have a special check context that ensures
3464 * that i.e. a lambda return type is compatible with the expected
3465 * type according to both the inherited context and the assignment
3466 * context.
3467 */
3468 class FunctionalReturnContext extends Check.NestedCheckContext {
3469
3470 FunctionalReturnContext(CheckContext enclosingContext) {
3471 super(enclosingContext);
3472 }
3473
3474 @Override
3475 public boolean compatible(Type found, Type req, Warner warn) {
3476 //return type must be compatible in both current context and assignment context
3477 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3478 }
3479
3480 @Override
3481 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3482 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3483 }
3484 }
3485
3486 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3487
3488 JCExpression expr;
3489 boolean expStmtExpected;
3490
3491 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3492 super(enclosingContext);
3493 this.expr = expr;
3494 }
3495
3496 @Override
3497 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3498 if (expStmtExpected) {
3499 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3500 } else {
3501 super.report(pos, details);
3502 }
3503 }
3504
3505 @Override
3506 public boolean compatible(Type found, Type req, Warner warn) {
3507 //a void return is compatible with an expression statement lambda
3508 if (req.hasTag(VOID)) {
3509 expStmtExpected = true;
3510 return TreeInfo.isExpressionStatement(expr);
3511 } else {
3512 return super.compatible(found, req, warn);
3513 }
3514 }
3515 }
3516
3517 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3518 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3519 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3520 new FunctionalReturnContext(resultInfo.checkContext);
3521
3522 return descriptor.getReturnType() == Type.recoveryType ?
3523 recoveryInfo :
3524 new ResultInfo(KindSelector.VAL,
3525 descriptor.getReturnType(), funcContext);
3526 }
3527
3528 /**
3529 * Lambda compatibility. Check that given return types, thrown types, parameter types
3530 * are compatible with the expected functional interface descriptor. This means that:
3531 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3532 * types must be compatible with the return type of the expected descriptor.
3533 */
3534 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3535 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3536
3537 //return values have already been checked - but if lambda has no return
3538 //values, we must ensure that void/value compatibility is correct;
3539 //this amounts at checking that, if a lambda body can complete normally,
3540 //the descriptor's return type must be void
3541 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3542 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3543 Fragment msg =
3544 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3545 checkContext.report(tree,
3546 diags.fragment(msg));
3547 }
3548
3549 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3550 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3551 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3552 }
3553 }
3554
3555 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3556 * static field and that lambda has type annotations, these annotations will
3557 * also be stored at these fake clinit methods.
3558 *
3559 * LambdaToMethod also use fake clinit methods so they can be reused.
3560 * Also as LTM is a phase subsequent to attribution, the methods from
3561 * clinits can be safely removed by LTM to save memory.
3562 */
3563 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3564
3565 public MethodSymbol removeClinit(ClassSymbol sym) {
3566 return clinits.remove(sym);
3567 }
3568
3569 /* This method returns an environment to be used to attribute a lambda
3570 * expression.
3571 *
3572 * The owner of this environment is a method symbol. If the current owner
3573 * is not a method, for example if the lambda is used to initialize
3574 * a field, then if the field is:
3575 *
3576 * - an instance field, we use the first constructor.
3577 * - a static field, we create a fake clinit method.
3578 */
3579 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3580 Env<AttrContext> lambdaEnv;
3581 Symbol owner = env.info.scope.owner;
3582 if (owner.kind == VAR && owner.owner.kind == TYP) {
3583 //field initializer
3584 ClassSymbol enclClass = owner.enclClass();
3585 Symbol newScopeOwner = env.info.scope.owner;
3586 /* if the field isn't static, then we can get the first constructor
3587 * and use it as the owner of the environment. This is what
3588 * LTM code is doing to look for type annotations so we are fine.
3589 */
3590 if ((owner.flags() & STATIC) == 0) {
3591 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3592 newScopeOwner = s;
3593 break;
3594 }
3595 } else {
3596 /* if the field is static then we need to create a fake clinit
3597 * method, this method can later be reused by LTM.
3598 */
3599 MethodSymbol clinit = clinits.get(enclClass);
3600 if (clinit == null) {
3601 Type clinitType = new MethodType(List.nil(),
3602 syms.voidType, List.nil(), syms.methodClass);
3603 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3604 names.clinit, clinitType, enclClass);
3605 clinit.params = List.nil();
3606 clinits.put(enclClass, clinit);
3607 }
3608 newScopeOwner = clinit;
3609 }
3610 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3611 } else {
3612 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3613 }
3614 lambdaEnv.info.yieldResult = null;
3615 lambdaEnv.info.isLambda = true;
3616 return lambdaEnv;
3617 }
3618
3619 @Override
3620 public void visitReference(final JCMemberReference that) {
3621 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3622 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3623 //method reference only allowed in assignment or method invocation/cast context
3624 log.error(that.pos(), Errors.UnexpectedMref);
3625 }
3626 result = that.type = types.createErrorType(pt());
3627 return;
3628 }
3629 final Env<AttrContext> localEnv = env.dup(that);
3630 try {
3631 //attribute member reference qualifier - if this is a constructor
3632 //reference, the expected kind must be a type
3633 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3634
3635 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3636 exprType = chk.checkConstructorRefType(that.expr, exprType);
3637 if (!exprType.isErroneous() &&
3638 exprType.isRaw() &&
3639 that.typeargs != null) {
3640 log.error(that.expr.pos(),
3641 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3642 Fragments.MrefInferAndExplicitParams));
3643 exprType = types.createErrorType(exprType);
3644 }
3645 }
3646
3647 if (exprType.isErroneous()) {
3648 //if the qualifier expression contains problems,
3649 //give up attribution of method reference
3650 result = that.type = exprType;
3651 return;
3652 }
3653
3654 if (TreeInfo.isStaticSelector(that.expr, names)) {
3655 //if the qualifier is a type, validate it; raw warning check is
3656 //omitted as we don't know at this stage as to whether this is a
3657 //raw selector (because of inference)
3658 chk.validate(that.expr, env, false);
3659 } else {
3660 Symbol lhsSym = TreeInfo.symbol(that.expr);
3661 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3662 }
3663 //attrib type-arguments
3664 List<Type> typeargtypes = List.nil();
3665 if (that.typeargs != null) {
3666 typeargtypes = attribTypes(that.typeargs, localEnv);
3667 }
3668
3669 boolean isTargetSerializable =
3670 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3671 rs.isSerializable(pt());
3672 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3673 Type currentTarget = targetInfo.target;
3674 Type desc = targetInfo.descriptor;
3675
3676 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3677 List<Type> argtypes = desc.getParameterTypes();
3678 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3679
3680 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3681 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3682 }
3683
3684 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3685 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3686 try {
3687 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3688 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3689 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3690 } finally {
3691 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3692 }
3693
3694 Symbol refSym = refResult.fst;
3695 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3696
3697 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3698 * JDK-8075541
3699 */
3700 if (refSym.kind != MTH) {
3701 boolean targetError;
3702 switch (refSym.kind) {
3703 case ABSENT_MTH:
3704 case MISSING_ENCL:
3705 targetError = false;
3706 break;
3707 case WRONG_MTH:
3708 case WRONG_MTHS:
3709 case AMBIGUOUS:
3710 case HIDDEN:
3711 case STATICERR:
3712 targetError = true;
3713 break;
3714 default:
3715 Assert.error("unexpected result kind " + refSym.kind);
3716 targetError = false;
3717 }
3718
3719 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3720 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3721 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3722
3723 JCDiagnostic diag = diags.create(log.currentSource(), that,
3724 targetError ?
3725 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3726 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3727
3728 if (targetError && currentTarget == Type.recoveryType) {
3729 //a target error doesn't make sense during recovery stage
3730 //as we don't know what actual parameter types are
3731 result = that.type = currentTarget;
3732 return;
3733 } else {
3734 if (targetError) {
3735 resultInfo.checkContext.report(that, diag);
3736 } else {
3737 log.report(diag);
3738 }
3739 result = that.type = types.createErrorType(currentTarget);
3740 return;
3741 }
3742 }
3743
3744 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3745 that.kind = lookupHelper.referenceKind(that.sym);
3746 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3747
3748 if (desc.getReturnType() == Type.recoveryType) {
3749 // stop here
3750 result = that.type = currentTarget;
3751 return;
3752 }
3753
3754 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3755 Type enclosingType = exprType.getEnclosingType();
3756 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3757 // Check for the existence of an appropriate outer instance
3758 rs.resolveImplicitThis(that.pos(), env, exprType);
3759 }
3760 }
3761
3762 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3763
3764 if (that.getMode() == ReferenceMode.INVOKE &&
3765 TreeInfo.isStaticSelector(that.expr, names) &&
3766 that.kind.isUnbound() &&
3767 lookupHelper.site.isRaw()) {
3768 chk.checkRaw(that.expr, localEnv);
3769 }
3770
3771 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3772 exprType.getTypeArguments().nonEmpty()) {
3773 //static ref with class type-args
3774 log.error(that.expr.pos(),
3775 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3776 Fragments.StaticMrefWithTargs));
3777 result = that.type = types.createErrorType(currentTarget);
3778 return;
3779 }
3780
3781 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3782 // Check that super-qualified symbols are not abstract (JLS)
3783 rs.checkNonAbstract(that.pos(), that.sym);
3784 }
3785
3786 if (isTargetSerializable) {
3787 chk.checkAccessFromSerializableElement(that, true);
3788 }
3789 }
3790
3791 ResultInfo checkInfo =
3792 resultInfo.dup(newMethodTemplate(
3793 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3794 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3795 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3796
3797 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3798
3799 if (that.kind.isUnbound() &&
3800 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3801 //re-generate inference constraints for unbound receiver
3802 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3803 //cannot happen as this has already been checked - we just need
3804 //to regenerate the inference constraints, as that has been lost
3805 //as a result of the call to inferenceContext.save()
3806 Assert.error("Can't get here");
3807 }
3808 }
3809
3810 if (!refType.isErroneous()) {
3811 refType = types.createMethodTypeWithReturn(refType,
3812 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3813 }
3814
3815 //go ahead with standard method reference compatibility check - note that param check
3816 //is a no-op (as this has been taken care during method applicability)
3817 boolean isSpeculativeRound =
3818 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3819
3820 that.type = currentTarget; //avoids recovery at this stage
3821 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3822 if (!isSpeculativeRound) {
3823 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3824 }
3825 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3826 } catch (Types.FunctionDescriptorLookupError ex) {
3827 JCDiagnostic cause = ex.getDiagnostic();
3828 resultInfo.checkContext.report(that, cause);
3829 result = that.type = types.createErrorType(pt());
3830 return;
3831 }
3832 }
3833 //where
3834 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3835 //if this is a constructor reference, the expected kind must be a type
3836 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3837 KindSelector.VAL_TYP : KindSelector.TYP,
3838 Type.noType);
3839 }
3840
3841
3842 @SuppressWarnings("fallthrough")
3843 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3844 InferenceContext inferenceContext = checkContext.inferenceContext();
3845 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3846
3847 Type resType;
3848 switch (tree.getMode()) {
3849 case NEW:
3850 if (!tree.expr.type.isRaw()) {
3851 resType = tree.expr.type;
3852 break;
3853 }
3854 default:
3855 resType = refType.getReturnType();
3856 }
3857
3858 Type incompatibleReturnType = resType;
3859
3860 if (returnType.hasTag(VOID)) {
3861 incompatibleReturnType = null;
3862 }
3863
3864 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3865 if (resType.isErroneous() ||
3866 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3867 checkContext.checkWarner(tree, resType, returnType))) {
3868 incompatibleReturnType = null;
3869 }
3870 }
3871
3872 if (incompatibleReturnType != null) {
3873 Fragment msg =
3874 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3875 checkContext.report(tree, diags.fragment(msg));
3876 } else {
3877 if (inferenceContext.free(refType)) {
3878 // we need to wait for inference to finish and then replace inference vars in the referent type
3879 inferenceContext.addFreeTypeListener(List.of(refType),
3880 instantiatedContext -> {
3881 tree.referentType = instantiatedContext.asInstType(refType);
3882 });
3883 } else {
3884 tree.referentType = refType;
3885 }
3886 }
3887
3888 if (!speculativeAttr) {
3889 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3890 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3891 }
3892 }
3893 }
3894
3895 boolean checkExConstraints(
3896 List<Type> thrownByFuncExpr,
3897 List<Type> thrownAtFuncType,
3898 InferenceContext inferenceContext) {
3899 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3900 * are not proper types
3901 */
3902 List<Type> nonProperList = thrownAtFuncType.stream()
3903 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3904 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3905
3906 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3907 * in the throws clause of the invocation type of the method reference's compile-time
3908 * declaration
3909 */
3910 List<Type> checkedList = thrownByFuncExpr.stream()
3911 .filter(e -> chk.isChecked(e)).collect(List.collector());
3912
3913 /** If n = 0 (the function type's throws clause consists only of proper types), then
3914 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3915 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3916 * reduces to true
3917 */
3918 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3919 for (Type checked : checkedList) {
3920 boolean isSubtype = false;
3921 for (Type proper : properList) {
3922 if (types.isSubtype(checked, proper)) {
3923 isSubtype = true;
3924 break;
3925 }
3926 }
3927 if (!isSubtype) {
3928 uncaughtByProperTypes.add(checked);
3929 }
3930 }
3931
3932 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3933 return false;
3934 }
3935
3936 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3937 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3938 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3939 */
3940 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3941 uncaughtByProperTypes.forEach(checkedEx -> {
3942 nonProperAsUndet.forEach(nonProper -> {
3943 types.isSubtype(checkedEx, nonProper);
3944 });
3945 });
3946
3947 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3948 */
3949 nonProperAsUndet.stream()
3950 .filter(t -> t.hasTag(UNDETVAR))
3951 .forEach(t -> ((UndetVar)t).setThrow());
3952 return true;
3953 }
3954
3955 /**
3956 * Set functional type info on the underlying AST. Note: as the target descriptor
3957 * might contain inference variables, we might need to register an hook in the
3958 * current inference context.
3959 */
3960 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3961 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3962 if (checkContext.inferenceContext().free(descriptorType)) {
3963 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3964 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3965 inferenceContext.asInstType(primaryTarget), checkContext));
3966 } else {
3967 if (pt.hasTag(CLASS)) {
3968 fExpr.target = primaryTarget;
3969 }
3970 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3971 pt != Type.recoveryType) {
3972 //check that functional interface class is well-formed
3973 try {
3974 /* Types.makeFunctionalInterfaceClass() may throw an exception
3975 * when it's executed post-inference. See the listener code
3976 * above.
3977 */
3978 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3979 names.empty, fExpr.target, ABSTRACT);
3980 if (csym != null) {
3981 chk.checkImplementations(env.tree, csym, csym);
3982 try {
3983 //perform an additional functional interface check on the synthetic class,
3984 //as there may be spurious errors for raw targets - because of existing issues
3985 //with membership and inheritance (see JDK-8074570).
3986 csym.flags_field |= INTERFACE;
3987 types.findDescriptorType(csym.type);
3988 } catch (FunctionDescriptorLookupError err) {
3989 resultInfo.checkContext.report(fExpr,
3990 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3991 }
3992 }
3993 } catch (Types.FunctionDescriptorLookupError ex) {
3994 JCDiagnostic cause = ex.getDiagnostic();
3995 resultInfo.checkContext.report(env.tree, cause);
3996 }
3997 }
3998 }
3999 }
4000
4001 public void visitParens(JCParens tree) {
4002 Type owntype = attribTree(tree.expr, env, resultInfo);
4003 result = check(tree, owntype, pkind(), resultInfo);
4004 Symbol sym = TreeInfo.symbol(tree);
4005 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4006 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4007 }
4008
4009 public void visitAssign(JCAssign tree) {
4010 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4011 Type capturedType = capture(owntype);
4012 attribExpr(tree.rhs, env, owntype);
4013 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4014 }
4015
4016 public void visitAssignop(JCAssignOp tree) {
4017 // Attribute arguments.
4018 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4019 Type operand = attribExpr(tree.rhs, env);
4020 // Find operator.
4021 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4022 if (operator != operators.noOpSymbol &&
4023 !owntype.isErroneous() &&
4024 !operand.isErroneous()) {
4025 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4026 chk.checkCastable(tree.rhs.pos(),
4027 operator.type.getReturnType(),
4028 owntype);
4029 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4030 }
4031 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4032 }
4033
4034 public void visitUnary(JCUnary tree) {
4035 // Attribute arguments.
4036 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4037 ? attribTree(tree.arg, env, varAssignmentInfo)
4038 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4039
4040 // Find operator.
4041 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4042 Type owntype = types.createErrorType(tree.type);
4043 if (operator != operators.noOpSymbol &&
4044 !argtype.isErroneous()) {
4045 owntype = (tree.getTag().isIncOrDecUnaryOp())
4046 ? tree.arg.type
4047 : operator.type.getReturnType();
4048 int opc = operator.opcode;
4049
4050 // If the argument is constant, fold it.
4051 if (argtype.constValue() != null) {
4052 Type ctype = cfolder.fold1(opc, argtype);
4053 if (ctype != null) {
4054 owntype = cfolder.coerce(ctype, owntype);
4055 }
4056 }
4057 }
4058 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4059 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4060 }
4061
4062 public void visitBinary(JCBinary tree) {
4063 // Attribute arguments.
4064 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4065 // x && y
4066 // include x's bindings when true in y
4067
4068 // x || y
4069 // include x's bindings when false in y
4070
4071 MatchBindings lhsBindings = matchBindings;
4072 List<BindingSymbol> propagatedBindings;
4073 switch (tree.getTag()) {
4074 case AND:
4075 propagatedBindings = lhsBindings.bindingsWhenTrue;
4076 break;
4077 case OR:
4078 propagatedBindings = lhsBindings.bindingsWhenFalse;
4079 break;
4080 default:
4081 propagatedBindings = List.nil();
4082 break;
4083 }
4084 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4085 Type right;
4086 try {
4087 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4088 } finally {
4089 rhsEnv.info.scope.leave();
4090 }
4091
4092 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4093
4094 // Find operator.
4095 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4096 Type owntype = types.createErrorType(tree.type);
4097 if (operator != operators.noOpSymbol &&
4098 !left.isErroneous() &&
4099 !right.isErroneous()) {
4100 owntype = operator.type.getReturnType();
4101 int opc = operator.opcode;
4102 // If both arguments are constants, fold them.
4103 if (left.constValue() != null && right.constValue() != null) {
4104 Type ctype = cfolder.fold2(opc, left, right);
4105 if (ctype != null) {
4106 owntype = cfolder.coerce(ctype, owntype);
4107 }
4108 }
4109
4110 // Check that argument types of a reference ==, != are
4111 // castable to each other, (JLS 15.21). Note: unboxing
4112 // comparisons will not have an acmp* opc at this point.
4113 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4114 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4115 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4116 }
4117 }
4118
4119 chk.checkDivZero(tree.rhs.pos(), operator, right);
4120 }
4121 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4122 }
4123
4124 public void visitTypeCast(final JCTypeCast tree) {
4125 Type clazztype = attribType(tree.clazz, env);
4126 chk.validate(tree.clazz, env, false);
4127 //a fresh environment is required for 292 inference to work properly ---
4128 //see Infer.instantiatePolymorphicSignatureInstance()
4129 Env<AttrContext> localEnv = env.dup(tree);
4130 //should we propagate the target type?
4131 final ResultInfo castInfo;
4132 JCExpression expr = TreeInfo.skipParens(tree.expr);
4133 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4134 if (isPoly) {
4135 //expression is a poly - we need to propagate target type info
4136 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4137 new Check.NestedCheckContext(resultInfo.checkContext) {
4138 @Override
4139 public boolean compatible(Type found, Type req, Warner warn) {
4140 return types.isCastable(found, req, warn);
4141 }
4142 });
4143 } else {
4144 //standalone cast - target-type info is not propagated
4145 castInfo = unknownExprInfo;
4146 }
4147 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4148 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4149 if (exprtype.constValue() != null)
4150 owntype = cfolder.coerce(exprtype, owntype);
4151 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4152 if (!isPoly)
4153 chk.checkRedundantCast(localEnv, tree);
4154 }
4155
4156 public void visitTypeTest(JCInstanceOf tree) {
4157 Type exprtype = attribExpr(tree.expr, env);
4158 if (exprtype.isPrimitive()) {
4159 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4160 } else {
4161 exprtype = chk.checkNullOrRefType(
4162 tree.expr.pos(), exprtype);
4163 }
4164 Type clazztype;
4165 JCTree typeTree;
4166 if (tree.pattern.getTag() == BINDINGPATTERN ||
4167 tree.pattern.getTag() == RECORDPATTERN) {
4168 attribExpr(tree.pattern, env, exprtype);
4169 clazztype = tree.pattern.type;
4170 if (types.isSubtype(exprtype, clazztype) &&
4171 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4172 tree.pattern.getTag() != RECORDPATTERN) {
4173 if (!allowUnconditionalPatternsInstanceOf) {
4174 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4175 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4176 }
4177 }
4178 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4179 } else {
4180 clazztype = attribType(tree.pattern, env);
4181 typeTree = tree.pattern;
4182 chk.validate(typeTree, env, false);
4183 }
4184 if (clazztype.isPrimitive()) {
4185 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4186 } else {
4187 if (!clazztype.hasTag(TYPEVAR)) {
4188 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4189 }
4190 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4191 boolean valid = false;
4192 if (allowReifiableTypesInInstanceof) {
4193 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4194 } else {
4195 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4196 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4197 allowReifiableTypesInInstanceof = true;
4198 }
4199 if (!valid) {
4200 clazztype = types.createErrorType(clazztype);
4201 }
4202 }
4203 }
4204 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4205 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4206 }
4207
4208 private boolean checkCastablePattern(DiagnosticPosition pos,
4209 Type exprType,
4210 Type pattType) {
4211 Warner warner = new Warner();
4212 // if any type is erroneous, the problem is reported elsewhere
4213 if (exprType.isErroneous() || pattType.isErroneous()) {
4214 return false;
4215 }
4216 if (!types.isCastable(exprType, pattType, warner)) {
4217 chk.basicHandler.report(pos,
4218 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4219 return false;
4220 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4221 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4222 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4223 return true;
4224 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4225 log.error(pos,
4226 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4227 return false;
4228 } else {
4229 return true;
4230 }
4231 }
4232
4233 @Override
4234 public void visitAnyPattern(JCAnyPattern tree) {
4235 result = tree.type = resultInfo.pt;
4236 }
4237
4238 public void visitBindingPattern(JCBindingPattern tree) {
4239 Type type;
4240 if (tree.var.vartype != null) {
4241 type = attribType(tree.var.vartype, env);
4242 } else {
4243 type = resultInfo.pt;
4244 }
4245 tree.type = tree.var.type = type;
4246 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4247 v.pos = tree.pos;
4248 tree.var.sym = v;
4249 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4250 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4251 }
4252 if (tree.var.isImplicitlyTyped()) {
4253 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4254 : type);
4255 }
4256 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4257 if (!tree.var.isImplicitlyTyped()) {
4258 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4259 }
4260 annotate.flush();
4261 chk.validate(tree.var.vartype, env, true);
4262 result = tree.type;
4263 if (v.isUnnamedVariable()) {
4264 matchBindings = MatchBindingsComputer.EMPTY;
4265 } else {
4266 matchBindings = new MatchBindings(List.of(v), List.nil());
4267 }
4268 }
4269
4270 @Override
4271 public void visitRecordPattern(JCRecordPattern tree) {
4272 Type site;
4273
4274 if (tree.deconstructor == null) {
4275 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4276 tree.record = syms.errSymbol;
4277 site = tree.type = types.createErrorType(tree.record.type);
4278 } else {
4279 Type type = attribType(tree.deconstructor, env);
4280 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4281 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4282 if (inferred == null) {
4283 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4284 } else {
4285 type = inferred;
4286 }
4287 }
4288 tree.type = tree.deconstructor.type = type;
4289 site = types.capture(tree.type);
4290 }
4291
4292 List<Type> expectedRecordTypes;
4293 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4294 ClassSymbol record = (ClassSymbol) site.tsym;
4295 expectedRecordTypes = record.getRecordComponents()
4296 .stream()
4297 .map(rc -> types.memberType(site, rc))
4298 .map(t -> types.upward(t, types.captures(t)).baseType())
4299 .collect(List.collector());
4300 tree.record = record;
4301 } else {
4302 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4303 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4304 .limit(tree.nested.size())
4305 .collect(List.collector());
4306 tree.record = syms.errSymbol;
4307 }
4308 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4309 List<Type> recordTypes = expectedRecordTypes;
4310 List<JCPattern> nestedPatterns = tree.nested;
4311 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4312 try {
4313 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4314 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4315 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4316 outBindings.addAll(matchBindings.bindingsWhenTrue);
4317 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4318 nestedPatterns = nestedPatterns.tail;
4319 recordTypes = recordTypes.tail;
4320 }
4321 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4322 while (nestedPatterns.nonEmpty()) {
4323 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4324 nestedPatterns = nestedPatterns.tail;
4325 }
4326 List<Type> nestedTypes =
4327 tree.nested.stream().map(p -> p.type).collect(List.collector());
4328 log.error(tree.pos(),
4329 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4330 nestedTypes));
4331 }
4332 } finally {
4333 localEnv.info.scope.leave();
4334 }
4335 chk.validate(tree.deconstructor, env, true);
4336 result = tree.type;
4337 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4338 }
4339
4340 public void visitIndexed(JCArrayAccess tree) {
4341 Type owntype = types.createErrorType(tree.type);
4342 Type atype = attribExpr(tree.indexed, env);
4343 attribExpr(tree.index, env, syms.intType);
4344 if (types.isArray(atype))
4345 owntype = types.elemtype(atype);
4346 else if (!atype.hasTag(ERROR))
4347 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4348 if (!pkind().contains(KindSelector.VAL))
4349 owntype = capture(owntype);
4350 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4351 }
4352
4353 public void visitIdent(JCIdent tree) {
4354 Symbol sym;
4355
4356 // Find symbol
4357 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4358 // If we are looking for a method, the prototype `pt' will be a
4359 // method type with the type of the call's arguments as parameters.
4360 env.info.pendingResolutionPhase = null;
4361 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4362 } else if (tree.sym != null && tree.sym.kind != VAR) {
4363 sym = tree.sym;
4364 } else {
4365 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4366 }
4367 tree.sym = sym;
4368
4369 // Also find the environment current for the class where
4370 // sym is defined (`symEnv').
4371 Env<AttrContext> symEnv = env;
4372 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4373 sym.kind.matches(KindSelector.VAL_MTH) &&
4374 sym.owner.kind == TYP &&
4375 tree.name != names._this && tree.name != names._super) {
4376
4377 // Find environment in which identifier is defined.
4378 while (symEnv.outer != null &&
4379 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4380 symEnv = symEnv.outer;
4381 }
4382 }
4383
4384 // If symbol is a variable, ...
4385 if (sym.kind == VAR) {
4386 VarSymbol v = (VarSymbol)sym;
4387
4388 // ..., evaluate its initializer, if it has one, and check for
4389 // illegal forward reference.
4390 checkInit(tree, env, v, false);
4391
4392 // If we are expecting a variable (as opposed to a value), check
4393 // that the variable is assignable in the current environment.
4394 if (KindSelector.ASG.subset(pkind()))
4395 checkAssignable(tree.pos(), v, null, env);
4396 }
4397
4398 Env<AttrContext> env1 = env;
4399 if (sym.kind != ERR && sym.kind != TYP &&
4400 sym.owner != null && sym.owner != env1.enclClass.sym) {
4401 // If the found symbol is inaccessible, then it is
4402 // accessed through an enclosing instance. Locate this
4403 // enclosing instance:
4404 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4405 env1 = env1.outer;
4406 }
4407
4408 if (env.info.isSerializable) {
4409 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4410 }
4411
4412 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4413 }
4414
4415 public void visitSelect(JCFieldAccess tree) {
4416 // Determine the expected kind of the qualifier expression.
4417 KindSelector skind = KindSelector.NIL;
4418 if (tree.name == names._this || tree.name == names._super ||
4419 tree.name == names._class)
4420 {
4421 skind = KindSelector.TYP;
4422 } else {
4423 if (pkind().contains(KindSelector.PCK))
4424 skind = KindSelector.of(skind, KindSelector.PCK);
4425 if (pkind().contains(KindSelector.TYP))
4426 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4427 if (pkind().contains(KindSelector.VAL_MTH))
4428 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4429 }
4430
4431 // Attribute the qualifier expression, and determine its symbol (if any).
4432 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4433 Assert.check(site == tree.selected.type);
4434 if (!pkind().contains(KindSelector.TYP_PCK))
4435 site = capture(site); // Capture field access
4436
4437 // don't allow T.class T[].class, etc
4438 if (skind == KindSelector.TYP) {
4439 Type elt = site;
4440 while (elt.hasTag(ARRAY))
4441 elt = ((ArrayType)elt).elemtype;
4442 if (elt.hasTag(TYPEVAR)) {
4443 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4444 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4445 tree.sym = tree.type.tsym;
4446 return ;
4447 }
4448 }
4449
4450 // If qualifier symbol is a type or `super', assert `selectSuper'
4451 // for the selection. This is relevant for determining whether
4452 // protected symbols are accessible.
4453 Symbol sitesym = TreeInfo.symbol(tree.selected);
4454 boolean selectSuperPrev = env.info.selectSuper;
4455 env.info.selectSuper =
4456 sitesym != null &&
4457 sitesym.name == names._super;
4458
4459 // Determine the symbol represented by the selection.
4460 env.info.pendingResolutionPhase = null;
4461 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4462 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4463 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4464 sym = syms.errSymbol;
4465 }
4466 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4467 site = capture(site);
4468 sym = selectSym(tree, sitesym, site, env, resultInfo);
4469 }
4470 boolean varArgs = env.info.lastResolveVarargs();
4471 tree.sym = sym;
4472
4473 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4474 site = types.skipTypeVars(site, true);
4475 }
4476
4477 // If that symbol is a variable, ...
4478 if (sym.kind == VAR) {
4479 VarSymbol v = (VarSymbol)sym;
4480
4481 // ..., evaluate its initializer, if it has one, and check for
4482 // illegal forward reference.
4483 checkInit(tree, env, v, true);
4484
4485 // If we are expecting a variable (as opposed to a value), check
4486 // that the variable is assignable in the current environment.
4487 if (KindSelector.ASG.subset(pkind()))
4488 checkAssignable(tree.pos(), v, tree.selected, env);
4489 }
4490
4491 if (sitesym != null &&
4492 sitesym.kind == VAR &&
4493 ((VarSymbol)sitesym).isResourceVariable() &&
4494 sym.kind == MTH &&
4495 sym.name.equals(names.close) &&
4496 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4497 env.info.lint.isEnabled(LintCategory.TRY)) {
4498 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4499 }
4500
4501 // Disallow selecting a type from an expression
4502 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4503 tree.type = check(tree.selected, pt(),
4504 sitesym == null ?
4505 KindSelector.VAL : sitesym.kind.toSelector(),
4506 new ResultInfo(KindSelector.TYP_PCK, pt()));
4507 }
4508
4509 if (isType(sitesym)) {
4510 if (sym.name != names._this && sym.name != names._super) {
4511 // Check if type-qualified fields or methods are static (JLS)
4512 if ((sym.flags() & STATIC) == 0 &&
4513 sym.name != names._super &&
4514 (sym.kind == VAR || sym.kind == MTH)) {
4515 rs.accessBase(rs.new StaticError(sym),
4516 tree.pos(), site, sym.name, true);
4517 }
4518 }
4519 } else if (sym.kind != ERR &&
4520 (sym.flags() & STATIC) != 0 &&
4521 sym.name != names._class) {
4522 // If the qualified item is not a type and the selected item is static, report
4523 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4524 if (!sym.owner.isAnonymous()) {
4525 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4526 } else {
4527 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4528 }
4529 }
4530
4531 // If we are selecting an instance member via a `super', ...
4532 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4533
4534 // Check that super-qualified symbols are not abstract (JLS)
4535 rs.checkNonAbstract(tree.pos(), sym);
4536
4537 if (site.isRaw()) {
4538 // Determine argument types for site.
4539 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4540 if (site1 != null) site = site1;
4541 }
4542 }
4543
4544 if (env.info.isSerializable) {
4545 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4546 }
4547
4548 env.info.selectSuper = selectSuperPrev;
4549 result = checkId(tree, site, sym, env, resultInfo);
4550 }
4551 //where
4552 /** Determine symbol referenced by a Select expression,
4553 *
4554 * @param tree The select tree.
4555 * @param site The type of the selected expression,
4556 * @param env The current environment.
4557 * @param resultInfo The current result.
4558 */
4559 private Symbol selectSym(JCFieldAccess tree,
4560 Symbol location,
4561 Type site,
4562 Env<AttrContext> env,
4563 ResultInfo resultInfo) {
4564 DiagnosticPosition pos = tree.pos();
4565 Name name = tree.name;
4566 switch (site.getTag()) {
4567 case PACKAGE:
4568 return rs.accessBase(
4569 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4570 pos, location, site, name, true);
4571 case ARRAY:
4572 case CLASS:
4573 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4574 return rs.resolveQualifiedMethod(
4575 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4576 } else if (name == names._this || name == names._super) {
4577 return rs.resolveSelf(pos, env, site.tsym, name);
4578 } else if (name == names._class) {
4579 // In this case, we have already made sure in
4580 // visitSelect that qualifier expression is a type.
4581 return syms.getClassField(site, types);
4582 } else {
4583 // We are seeing a plain identifier as selector.
4584 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4585 sym = rs.accessBase(sym, pos, location, site, name, true);
4586 return sym;
4587 }
4588 case WILDCARD:
4589 throw new AssertionError(tree);
4590 case TYPEVAR:
4591 // Normally, site.getUpperBound() shouldn't be null.
4592 // It should only happen during memberEnter/attribBase
4593 // when determining the supertype which *must* be
4594 // done before attributing the type variables. In
4595 // other words, we are seeing this illegal program:
4596 // class B<T> extends A<T.foo> {}
4597 Symbol sym = (site.getUpperBound() != null)
4598 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4599 : null;
4600 if (sym == null) {
4601 log.error(pos, Errors.TypeVarCantBeDeref);
4602 return syms.errSymbol;
4603 } else {
4604 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4605 rs.new AccessError(env, site, sym) :
4606 sym;
4607 rs.accessBase(sym2, pos, location, site, name, true);
4608 return sym;
4609 }
4610 case ERROR:
4611 // preserve identifier names through errors
4612 return types.createErrorType(name, site.tsym, site).tsym;
4613 default:
4614 // The qualifier expression is of a primitive type -- only
4615 // .class is allowed for these.
4616 if (name == names._class) {
4617 // In this case, we have already made sure in Select that
4618 // qualifier expression is a type.
4619 return syms.getClassField(site, types);
4620 } else {
4621 log.error(pos, Errors.CantDeref(site));
4622 return syms.errSymbol;
4623 }
4624 }
4625 }
4626
4627 /** Determine type of identifier or select expression and check that
4628 * (1) the referenced symbol is not deprecated
4629 * (2) the symbol's type is safe (@see checkSafe)
4630 * (3) if symbol is a variable, check that its type and kind are
4631 * compatible with the prototype and protokind.
4632 * (4) if symbol is an instance field of a raw type,
4633 * which is being assigned to, issue an unchecked warning if its
4634 * type changes under erasure.
4635 * (5) if symbol is an instance method of a raw type, issue an
4636 * unchecked warning if its argument types change under erasure.
4637 * If checks succeed:
4638 * If symbol is a constant, return its constant type
4639 * else if symbol is a method, return its result type
4640 * otherwise return its type.
4641 * Otherwise return errType.
4642 *
4643 * @param tree The syntax tree representing the identifier
4644 * @param site If this is a select, the type of the selected
4645 * expression, otherwise the type of the current class.
4646 * @param sym The symbol representing the identifier.
4647 * @param env The current environment.
4648 * @param resultInfo The expected result
4649 */
4650 Type checkId(JCTree tree,
4651 Type site,
4652 Symbol sym,
4653 Env<AttrContext> env,
4654 ResultInfo resultInfo) {
4655 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4656 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4657 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4658 }
4659
4660 Type checkMethodIdInternal(JCTree tree,
4661 Type site,
4662 Symbol sym,
4663 Env<AttrContext> env,
4664 ResultInfo resultInfo) {
4665 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4666 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4667 } else {
4668 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4669 }
4670 }
4671
4672 Type checkIdInternal(JCTree tree,
4673 Type site,
4674 Symbol sym,
4675 Type pt,
4676 Env<AttrContext> env,
4677 ResultInfo resultInfo) {
4678 Type owntype; // The computed type of this identifier occurrence.
4679 switch (sym.kind) {
4680 case TYP:
4681 // For types, the computed type equals the symbol's type,
4682 // except for two situations:
4683 owntype = sym.type;
4684 if (owntype.hasTag(CLASS)) {
4685 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4686 Type ownOuter = owntype.getEnclosingType();
4687
4688 // (a) If the symbol's type is parameterized, erase it
4689 // because no type parameters were given.
4690 // We recover generic outer type later in visitTypeApply.
4691 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4692 owntype = types.erasure(owntype);
4693 }
4694
4695 // (b) If the symbol's type is an inner class, then
4696 // we have to interpret its outer type as a superclass
4697 // of the site type. Example:
4698 //
4699 // class Tree<A> { class Visitor { ... } }
4700 // class PointTree extends Tree<Point> { ... }
4701 // ...PointTree.Visitor...
4702 //
4703 // Then the type of the last expression above is
4704 // Tree<Point>.Visitor.
4705 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4706 Type normOuter = site;
4707 if (normOuter.hasTag(CLASS)) {
4708 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4709 }
4710 if (normOuter == null) // perhaps from an import
4711 normOuter = types.erasure(ownOuter);
4712 if (normOuter != ownOuter)
4713 owntype = new ClassType(
4714 normOuter, List.nil(), owntype.tsym,
4715 owntype.getMetadata());
4716 }
4717 }
4718 break;
4719 case VAR:
4720 VarSymbol v = (VarSymbol)sym;
4721
4722 if (env.info.enclVar != null
4723 && v.type.hasTag(NONE)) {
4724 //self reference to implicitly typed variable declaration
4725 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4726 return tree.type = v.type = types.createErrorType(v.type);
4727 }
4728
4729 // Test (4): if symbol is an instance field of a raw type,
4730 // which is being assigned to, issue an unchecked warning if
4731 // its type changes under erasure.
4732 if (KindSelector.ASG.subset(pkind()) &&
4733 v.owner.kind == TYP &&
4734 (v.flags() & STATIC) == 0 &&
4735 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4736 Type s = types.asOuterSuper(site, v.owner);
4737 if (s != null &&
4738 s.isRaw() &&
4739 !types.isSameType(v.type, v.erasure(types))) {
4740 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4741 }
4742 }
4743 // The computed type of a variable is the type of the
4744 // variable symbol, taken as a member of the site type.
4745 owntype = (sym.owner.kind == TYP &&
4746 sym.name != names._this && sym.name != names._super)
4747 ? types.memberType(site, sym)
4748 : sym.type;
4749
4750 // If the variable is a constant, record constant value in
4751 // computed type.
4752 if (v.getConstValue() != null && isStaticReference(tree))
4753 owntype = owntype.constType(v.getConstValue());
4754
4755 if (resultInfo.pkind == KindSelector.VAL) {
4756 owntype = capture(owntype); // capture "names as expressions"
4757 }
4758 break;
4759 case MTH: {
4760 owntype = checkMethod(site, sym,
4761 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4762 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4763 resultInfo.pt.getTypeArguments());
4764 chk.checkRestricted(tree.pos(), sym);
4765 break;
4766 }
4767 case PCK: case ERR:
4768 owntype = sym.type;
4769 break;
4770 default:
4771 throw new AssertionError("unexpected kind: " + sym.kind +
4772 " in tree " + tree);
4773 }
4774
4775 // Emit a `deprecation' warning if symbol is deprecated.
4776 // (for constructors (but not for constructor references), the error
4777 // was given when the constructor was resolved)
4778
4779 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4780 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4781 chk.checkSunAPI(tree.pos(), sym);
4782 chk.checkProfile(tree.pos(), sym);
4783 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4784 }
4785
4786 if (pt.isErroneous()) {
4787 owntype = types.createErrorType(owntype);
4788 }
4789
4790 // If symbol is a variable, check that its type and
4791 // kind are compatible with the prototype and protokind.
4792 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4793 }
4794
4795 /** Check that variable is initialized and evaluate the variable's
4796 * initializer, if not yet done. Also check that variable is not
4797 * referenced before it is defined.
4798 * @param tree The tree making up the variable reference.
4799 * @param env The current environment.
4800 * @param v The variable's symbol.
4801 */
4802 private void checkInit(JCTree tree,
4803 Env<AttrContext> env,
4804 VarSymbol v,
4805 boolean onlyWarning) {
4806 // A forward reference is diagnosed if the declaration position
4807 // of the variable is greater than the current tree position
4808 // and the tree and variable definition occur in the same class
4809 // definition. Note that writes don't count as references.
4810 // This check applies only to class and instance
4811 // variables. Local variables follow different scope rules,
4812 // and are subject to definite assignment checking.
4813 Env<AttrContext> initEnv = enclosingInitEnv(env);
4814 if (initEnv != null &&
4815 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4816 v.owner.kind == TYP &&
4817 v.owner == env.info.scope.owner.enclClass() &&
4818 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4819 (!env.tree.hasTag(ASSIGN) ||
4820 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4821 if (!onlyWarning || isStaticEnumField(v)) {
4822 Error errkey = (initEnv.info.enclVar == v) ?
4823 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4824 log.error(tree.pos(), errkey);
4825 } else if (useBeforeDeclarationWarning) {
4826 Warning warnkey = (initEnv.info.enclVar == v) ?
4827 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4828 log.warning(tree.pos(), warnkey);
4829 }
4830 }
4831
4832 v.getConstValue(); // ensure initializer is evaluated
4833
4834 checkEnumInitializer(tree, env, v);
4835 }
4836
4837 /**
4838 * Returns the enclosing init environment associated with this env (if any). An init env
4839 * can be either a field declaration env or a static/instance initializer env.
4840 */
4841 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4842 while (true) {
4843 switch (env.tree.getTag()) {
4844 case VARDEF:
4845 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4846 if (vdecl.sym.owner.kind == TYP) {
4847 //field
4848 return env;
4849 }
4850 break;
4851 case BLOCK:
4852 if (env.next.tree.hasTag(CLASSDEF)) {
4853 //instance/static initializer
4854 return env;
4855 }
4856 break;
4857 case METHODDEF:
4858 case CLASSDEF:
4859 case TOPLEVEL:
4860 return null;
4861 }
4862 Assert.checkNonNull(env.next);
4863 env = env.next;
4864 }
4865 }
4866
4867 /**
4868 * Check for illegal references to static members of enum. In
4869 * an enum type, constructors and initializers may not
4870 * reference its static members unless they are constant.
4871 *
4872 * @param tree The tree making up the variable reference.
4873 * @param env The current environment.
4874 * @param v The variable's symbol.
4875 * @jls 8.9 Enum Types
4876 */
4877 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4878 // JLS:
4879 //
4880 // "It is a compile-time error to reference a static field
4881 // of an enum type that is not a compile-time constant
4882 // (15.28) from constructors, instance initializer blocks,
4883 // or instance variable initializer expressions of that
4884 // type. It is a compile-time error for the constructors,
4885 // instance initializer blocks, or instance variable
4886 // initializer expressions of an enum constant e to refer
4887 // to itself or to an enum constant of the same type that
4888 // is declared to the right of e."
4889 if (isStaticEnumField(v)) {
4890 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4891
4892 if (enclClass == null || enclClass.owner == null)
4893 return;
4894
4895 // See if the enclosing class is the enum (or a
4896 // subclass thereof) declaring v. If not, this
4897 // reference is OK.
4898 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4899 return;
4900
4901 // If the reference isn't from an initializer, then
4902 // the reference is OK.
4903 if (!Resolve.isInitializer(env))
4904 return;
4905
4906 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4907 }
4908 }
4909
4910 /** Is the given symbol a static, non-constant field of an Enum?
4911 * Note: enum literals should not be regarded as such
4912 */
4913 private boolean isStaticEnumField(VarSymbol v) {
4914 return Flags.isEnum(v.owner) &&
4915 Flags.isStatic(v) &&
4916 !Flags.isConstant(v) &&
4917 v.name != names._class;
4918 }
4919
4920 /**
4921 * Check that method arguments conform to its instantiation.
4922 **/
4923 public Type checkMethod(Type site,
4924 final Symbol sym,
4925 ResultInfo resultInfo,
4926 Env<AttrContext> env,
4927 final List<JCExpression> argtrees,
4928 List<Type> argtypes,
4929 List<Type> typeargtypes) {
4930 // Test (5): if symbol is an instance method of a raw type, issue
4931 // an unchecked warning if its argument types change under erasure.
4932 if ((sym.flags() & STATIC) == 0 &&
4933 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4934 Type s = types.asOuterSuper(site, sym.owner);
4935 if (s != null && s.isRaw() &&
4936 !types.isSameTypes(sym.type.getParameterTypes(),
4937 sym.erasure(types).getParameterTypes())) {
4938 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4939 }
4940 }
4941
4942 if (env.info.defaultSuperCallSite != null) {
4943 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4944 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4945 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4946 List<MethodSymbol> icand_sup =
4947 types.interfaceCandidates(sup, (MethodSymbol)sym);
4948 if (icand_sup.nonEmpty() &&
4949 icand_sup.head != sym &&
4950 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4951 log.error(env.tree.pos(),
4952 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4953 break;
4954 }
4955 }
4956 env.info.defaultSuperCallSite = null;
4957 }
4958
4959 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4960 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4961 if (app.meth.hasTag(SELECT) &&
4962 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4963 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4964 }
4965 }
4966
4967 // Compute the identifier's instantiated type.
4968 // For methods, we need to compute the instance type by
4969 // Resolve.instantiate from the symbol's type as well as
4970 // any type arguments and value arguments.
4971 Warner noteWarner = new Warner();
4972 try {
4973 Type owntype = rs.checkMethod(
4974 env,
4975 site,
4976 sym,
4977 resultInfo,
4978 argtypes,
4979 typeargtypes,
4980 noteWarner);
4981
4982 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4983 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4984
4985 argtypes = argtypes.map(checkDeferredMap);
4986
4987 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4988 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4989 sym.name,
4990 rs.methodArguments(sym.type.getParameterTypes()),
4991 rs.methodArguments(argtypes.map(checkDeferredMap)),
4992 kindName(sym.location()),
4993 sym.location()));
4994 if (resultInfo.pt != Infer.anyPoly ||
4995 !owntype.hasTag(METHOD) ||
4996 !owntype.isPartial()) {
4997 //if this is not a partially inferred method type, erase return type. Otherwise,
4998 //erasure is carried out in PartiallyInferredMethodType.check().
4999 owntype = new MethodType(owntype.getParameterTypes(),
5000 types.erasure(owntype.getReturnType()),
5001 types.erasure(owntype.getThrownTypes()),
5002 syms.methodClass);
5003 }
5004 }
5005
5006 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5007 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5008 PolyKind.POLY : PolyKind.STANDALONE;
5009 TreeInfo.setPolyKind(env.tree, pkind);
5010
5011 return (resultInfo.pt == Infer.anyPoly) ?
5012 owntype :
5013 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5014 resultInfo.checkContext.inferenceContext());
5015 } catch (Infer.InferenceException ex) {
5016 //invalid target type - propagate exception outwards or report error
5017 //depending on the current check context
5018 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5019 return types.createErrorType(site);
5020 } catch (Resolve.InapplicableMethodException ex) {
5021 final JCDiagnostic diag = ex.getDiagnostic();
5022 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5023 @Override
5024 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5025 return new Pair<>(sym, diag);
5026 }
5027 };
5028 List<Type> argtypes2 = argtypes.map(
5029 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5030 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5031 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5032 log.report(errDiag);
5033 return types.createErrorType(site);
5034 }
5035 }
5036
5037 public void visitLiteral(JCLiteral tree) {
5038 result = check(tree, litType(tree.typetag).constType(tree.value),
5039 KindSelector.VAL, resultInfo);
5040 }
5041 //where
5042 /** Return the type of a literal with given type tag.
5043 */
5044 Type litType(TypeTag tag) {
5045 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5046 }
5047
5048 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5049 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5050 }
5051
5052 public void visitTypeArray(JCArrayTypeTree tree) {
5053 Type etype = attribType(tree.elemtype, env);
5054 Type type = new ArrayType(etype, syms.arrayClass);
5055 result = check(tree, type, KindSelector.TYP, resultInfo);
5056 }
5057
5058 /** Visitor method for parameterized types.
5059 * Bound checking is left until later, since types are attributed
5060 * before supertype structure is completely known
5061 */
5062 public void visitTypeApply(JCTypeApply tree) {
5063 Type owntype = types.createErrorType(tree.type);
5064
5065 // Attribute functor part of application and make sure it's a class.
5066 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5067
5068 // Attribute type parameters
5069 List<Type> actuals = attribTypes(tree.arguments, env);
5070
5071 if (clazztype.hasTag(CLASS)) {
5072 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5073 if (actuals.isEmpty()) //diamond
5074 actuals = formals;
5075
5076 if (actuals.length() == formals.length()) {
5077 List<Type> a = actuals;
5078 List<Type> f = formals;
5079 while (a.nonEmpty()) {
5080 a.head = a.head.withTypeVar(f.head);
5081 a = a.tail;
5082 f = f.tail;
5083 }
5084 // Compute the proper generic outer
5085 Type clazzOuter = clazztype.getEnclosingType();
5086 if (clazzOuter.hasTag(CLASS)) {
5087 Type site;
5088 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5089 if (clazz.hasTag(IDENT)) {
5090 site = env.enclClass.sym.type;
5091 } else if (clazz.hasTag(SELECT)) {
5092 site = ((JCFieldAccess) clazz).selected.type;
5093 } else throw new AssertionError(""+tree);
5094 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5095 if (site.hasTag(CLASS))
5096 site = types.asOuterSuper(site, clazzOuter.tsym);
5097 if (site == null)
5098 site = types.erasure(clazzOuter);
5099 clazzOuter = site;
5100 }
5101 }
5102 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5103 clazztype.getMetadata());
5104 } else {
5105 if (formals.length() != 0) {
5106 log.error(tree.pos(),
5107 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5108 } else {
5109 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5110 }
5111 owntype = types.createErrorType(tree.type);
5112 }
5113 }
5114 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5115 }
5116
5117 public void visitTypeUnion(JCTypeUnion tree) {
5118 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5119 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5120 for (JCExpression typeTree : tree.alternatives) {
5121 Type ctype = attribType(typeTree, env);
5122 ctype = chk.checkType(typeTree.pos(),
5123 chk.checkClassType(typeTree.pos(), ctype),
5124 syms.throwableType);
5125 if (!ctype.isErroneous()) {
5126 //check that alternatives of a union type are pairwise
5127 //unrelated w.r.t. subtyping
5128 if (chk.intersects(ctype, multicatchTypes.toList())) {
5129 for (Type t : multicatchTypes) {
5130 boolean sub = types.isSubtype(ctype, t);
5131 boolean sup = types.isSubtype(t, ctype);
5132 if (sub || sup) {
5133 //assume 'a' <: 'b'
5134 Type a = sub ? ctype : t;
5135 Type b = sub ? t : ctype;
5136 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5137 }
5138 }
5139 }
5140 multicatchTypes.append(ctype);
5141 if (all_multicatchTypes != null)
5142 all_multicatchTypes.append(ctype);
5143 } else {
5144 if (all_multicatchTypes == null) {
5145 all_multicatchTypes = new ListBuffer<>();
5146 all_multicatchTypes.appendList(multicatchTypes);
5147 }
5148 all_multicatchTypes.append(ctype);
5149 }
5150 }
5151 Type t = check(tree, types.lub(multicatchTypes.toList()),
5152 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5153 if (t.hasTag(CLASS)) {
5154 List<Type> alternatives =
5155 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5156 t = new UnionClassType((ClassType) t, alternatives);
5157 }
5158 tree.type = result = t;
5159 }
5160
5161 public void visitTypeIntersection(JCTypeIntersection tree) {
5162 attribTypes(tree.bounds, env);
5163 tree.type = result = checkIntersection(tree, tree.bounds);
5164 }
5165
5166 public void visitTypeParameter(JCTypeParameter tree) {
5167 TypeVar typeVar = (TypeVar) tree.type;
5168
5169 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5170 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5171 }
5172
5173 if (!typeVar.getUpperBound().isErroneous()) {
5174 //fixup type-parameter bound computed in 'attribTypeVariables'
5175 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5176 }
5177 }
5178
5179 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5180 Set<Symbol> boundSet = new HashSet<>();
5181 if (bounds.nonEmpty()) {
5182 // accept class or interface or typevar as first bound.
5183 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5184 boundSet.add(types.erasure(bounds.head.type).tsym);
5185 if (bounds.head.type.isErroneous()) {
5186 return bounds.head.type;
5187 }
5188 else if (bounds.head.type.hasTag(TYPEVAR)) {
5189 // if first bound was a typevar, do not accept further bounds.
5190 if (bounds.tail.nonEmpty()) {
5191 log.error(bounds.tail.head.pos(),
5192 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5193 return bounds.head.type;
5194 }
5195 } else {
5196 // if first bound was a class or interface, accept only interfaces
5197 // as further bounds.
5198 for (JCExpression bound : bounds.tail) {
5199 bound.type = checkBase(bound.type, bound, env, false, true, false);
5200 if (bound.type.isErroneous()) {
5201 bounds = List.of(bound);
5202 }
5203 else if (bound.type.hasTag(CLASS)) {
5204 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5205 }
5206 }
5207 }
5208 }
5209
5210 if (bounds.length() == 0) {
5211 return syms.objectType;
5212 } else if (bounds.length() == 1) {
5213 return bounds.head.type;
5214 } else {
5215 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5216 // ... the variable's bound is a class type flagged COMPOUND
5217 // (see comment for TypeVar.bound).
5218 // In this case, generate a class tree that represents the
5219 // bound class, ...
5220 JCExpression extending;
5221 List<JCExpression> implementing;
5222 if (!bounds.head.type.isInterface()) {
5223 extending = bounds.head;
5224 implementing = bounds.tail;
5225 } else {
5226 extending = null;
5227 implementing = bounds;
5228 }
5229 JCClassDecl cd = make.at(tree).ClassDef(
5230 make.Modifiers(PUBLIC | ABSTRACT),
5231 names.empty, List.nil(),
5232 extending, implementing, List.nil());
5233
5234 ClassSymbol c = (ClassSymbol)owntype.tsym;
5235 Assert.check((c.flags() & COMPOUND) != 0);
5236 cd.sym = c;
5237 c.sourcefile = env.toplevel.sourcefile;
5238
5239 // ... and attribute the bound class
5240 c.flags_field |= UNATTRIBUTED;
5241 Env<AttrContext> cenv = enter.classEnv(cd, env);
5242 typeEnvs.put(c, cenv);
5243 attribClass(c);
5244 return owntype;
5245 }
5246 }
5247
5248 public void visitWildcard(JCWildcard tree) {
5249 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5250 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5251 ? syms.objectType
5252 : attribType(tree.inner, env);
5253 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5254 tree.kind.kind,
5255 syms.boundClass),
5256 KindSelector.TYP, resultInfo);
5257 }
5258
5259 public void visitAnnotation(JCAnnotation tree) {
5260 Assert.error("should be handled in annotate");
5261 }
5262
5263 @Override
5264 public void visitModifiers(JCModifiers tree) {
5265 //error recovery only:
5266 Assert.check(resultInfo.pkind == KindSelector.ERR);
5267
5268 attribAnnotationTypes(tree.annotations, env);
5269 }
5270
5271 public void visitAnnotatedType(JCAnnotatedType tree) {
5272 attribAnnotationTypes(tree.annotations, env);
5273 Type underlyingType =
5274 attribTree(tree.underlyingType, env, new ResultInfo(KindSelector.TYP_PCK, Type.noType));
5275 if (underlyingType.hasTag(PACKAGE)) {
5276 // Type annotations are not admissible on packages, but we handle packages here to
5277 // report better diagnostics later in validateAnnotatedType.
5278 result = tree.type = underlyingType;
5279 return;
5280 }
5281 Type annotatedType = underlyingType.preannotatedType();
5282
5283 if (!env.info.isNewClass)
5284 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5285 result = tree.type = annotatedType;
5286 }
5287
5288 public void visitErroneous(JCErroneous tree) {
5289 if (tree.errs != null) {
5290 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup());
5291 errEnv.info.returnResult = unknownExprInfo;
5292 for (JCTree err : tree.errs)
5293 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5294 }
5295 result = tree.type = syms.errType;
5296 }
5297
5298 /** Default visitor method for all other trees.
5299 */
5300 public void visitTree(JCTree tree) {
5301 throw new AssertionError();
5302 }
5303
5304 /**
5305 * Attribute an env for either a top level tree or class or module declaration.
5306 */
5307 public void attrib(Env<AttrContext> env) {
5308 switch (env.tree.getTag()) {
5309 case MODULEDEF:
5310 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5311 break;
5312 case PACKAGEDEF:
5313 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5314 break;
5315 default:
5316 attribClass(env.tree.pos(), env.enclClass.sym);
5317 }
5318
5319 annotate.flush();
5320 }
5321
5322 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5323 try {
5324 annotate.flush();
5325 attribPackage(p);
5326 } catch (CompletionFailure ex) {
5327 chk.completionError(pos, ex);
5328 }
5329 }
5330
5331 void attribPackage(PackageSymbol p) {
5332 attribWithLint(p,
5333 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5334 }
5335
5336 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5337 try {
5338 annotate.flush();
5339 attribModule(m);
5340 } catch (CompletionFailure ex) {
5341 chk.completionError(pos, ex);
5342 }
5343 }
5344
5345 void attribModule(ModuleSymbol m) {
5346 attribWithLint(m, env -> attribStat(env.tree, env));
5347 }
5348
5349 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5350 Env<AttrContext> env = typeEnvs.get(sym);
5351
5352 Env<AttrContext> lintEnv = env;
5353 while (lintEnv.info.lint == null)
5354 lintEnv = lintEnv.next;
5355
5356 Lint lint = lintEnv.info.lint.augment(sym);
5357
5358 Lint prevLint = chk.setLint(lint);
5359 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5360
5361 try {
5362 deferredLintHandler.flush(env.tree.pos(), lint);
5363 attrib.accept(env);
5364 } finally {
5365 log.useSource(prev);
5366 chk.setLint(prevLint);
5367 }
5368 }
5369
5370 /** Main method: attribute class definition associated with given class symbol.
5371 * reporting completion failures at the given position.
5372 * @param pos The source position at which completion errors are to be
5373 * reported.
5374 * @param c The class symbol whose definition will be attributed.
5375 */
5376 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5377 try {
5378 annotate.flush();
5379 attribClass(c);
5380 } catch (CompletionFailure ex) {
5381 chk.completionError(pos, ex);
5382 }
5383 }
5384
5385 /** Attribute class definition associated with given class symbol.
5386 * @param c The class symbol whose definition will be attributed.
5387 */
5388 void attribClass(ClassSymbol c) throws CompletionFailure {
5389 if (c.type.hasTag(ERROR)) return;
5390
5391 // Check for cycles in the inheritance graph, which can arise from
5392 // ill-formed class files.
5393 chk.checkNonCyclic(null, c.type);
5394
5395 Type st = types.supertype(c.type);
5396 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5397 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5398 // First, attribute superclass.
5399 if (st.hasTag(CLASS))
5400 attribClass((ClassSymbol)st.tsym);
5401
5402 // Next attribute owner, if it is a class.
5403 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5404 attribClass((ClassSymbol)c.owner);
5405
5406 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5407 }
5408
5409 // The previous operations might have attributed the current class
5410 // if there was a cycle. So we test first whether the class is still
5411 // UNATTRIBUTED.
5412 if ((c.flags_field & UNATTRIBUTED) != 0) {
5413 c.flags_field &= ~UNATTRIBUTED;
5414
5415 // Get environment current at the point of class definition.
5416 Env<AttrContext> env = typeEnvs.get(c);
5417
5418 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5419 // because the annotations were not available at the time the env was created. Therefore,
5420 // we look up the environment chain for the first enclosing environment for which the
5421 // lint value is set. Typically, this is the parent env, but might be further if there
5422 // are any envs created as a result of TypeParameter nodes.
5423 Env<AttrContext> lintEnv = env;
5424 while (lintEnv.info.lint == null)
5425 lintEnv = lintEnv.next;
5426
5427 // Having found the enclosing lint value, we can initialize the lint value for this class
5428 env.info.lint = lintEnv.info.lint.augment(c);
5429
5430 Lint prevLint = chk.setLint(env.info.lint);
5431 JavaFileObject prev = log.useSource(c.sourcefile);
5432 ResultInfo prevReturnRes = env.info.returnResult;
5433
5434 try {
5435 if (c.isSealed() &&
5436 !c.isEnum() &&
5437 !c.isPermittedExplicit &&
5438 c.getPermittedSubclasses().isEmpty()) {
5439 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5440 }
5441
5442 if (c.isSealed()) {
5443 Set<Symbol> permittedTypes = new HashSet<>();
5444 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5445 for (Type subType : c.getPermittedSubclasses()) {
5446 boolean isTypeVar = false;
5447 if (subType.getTag() == TYPEVAR) {
5448 isTypeVar = true; //error recovery
5449 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5450 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5451 }
5452 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5453 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5454 }
5455 if (permittedTypes.contains(subType.tsym)) {
5456 DiagnosticPosition pos =
5457 env.enclClass.permitting.stream()
5458 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5459 .limit(2).collect(List.collector()).get(1);
5460 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5461 } else {
5462 permittedTypes.add(subType.tsym);
5463 }
5464 if (sealedInUnnamed) {
5465 if (subType.tsym.packge() != c.packge()) {
5466 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5467 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5468 );
5469 }
5470 } else if (subType.tsym.packge().modle != c.packge().modle) {
5471 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5472 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5473 );
5474 }
5475 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5476 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5477 Errors.InvalidPermitsClause(
5478 subType.tsym == c.type.tsym ?
5479 Fragments.MustNotBeSameClass :
5480 Fragments.MustNotBeSupertype(subType)
5481 )
5482 );
5483 } else if (!isTypeVar) {
5484 boolean thisIsASuper = types.directSupertypes(subType)
5485 .stream()
5486 .anyMatch(d -> d.tsym == c);
5487 if (!thisIsASuper) {
5488 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5489 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5490 }
5491 }
5492 }
5493 }
5494
5495 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5496 .stream()
5497 .filter(s -> s.tsym.isSealed())
5498 .map(s -> (ClassSymbol) s.tsym)
5499 .collect(List.collector());
5500
5501 if (sealedSupers.isEmpty()) {
5502 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5503 boolean hasErrorSuper = false;
5504
5505 hasErrorSuper |= types.directSupertypes(c.type)
5506 .stream()
5507 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5508
5509 ClassType ct = (ClassType) c.type;
5510
5511 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5512
5513 if (!hasErrorSuper) {
5514 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5515 }
5516 }
5517 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5518 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5519 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5520 }
5521
5522 if (!c.type.isCompound()) {
5523 for (ClassSymbol supertypeSym : sealedSupers) {
5524 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5525 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5526 }
5527 }
5528 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5529 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5530 c.isInterface() ?
5531 Errors.NonSealedOrSealedExpected :
5532 Errors.NonSealedSealedOrFinalExpected);
5533 }
5534 }
5535 }
5536
5537 deferredLintHandler.flush(env.tree, env.info.lint);
5538 env.info.returnResult = null;
5539 // java.lang.Enum may not be subclassed by a non-enum
5540 if (st.tsym == syms.enumSym &&
5541 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5542 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5543
5544 // Enums may not be extended by source-level classes
5545 if (st.tsym != null &&
5546 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5547 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5548 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5549 }
5550
5551 if (rs.isSerializable(c.type)) {
5552 env.info.isSerializable = true;
5553 }
5554
5555 if (c.isValueClass()) {
5556 Assert.check(env.tree.hasTag(CLASSDEF));
5557 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5558 }
5559
5560 attribClassBody(env, c);
5561
5562 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5563 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5564 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5565 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5566
5567 if (c.isImplicit()) {
5568 chk.checkHasMain(env.tree.pos(), c);
5569 }
5570 } finally {
5571 env.info.returnResult = prevReturnRes;
5572 log.useSource(prev);
5573 chk.setLint(prevLint);
5574 }
5575
5576 }
5577 }
5578
5579 public void visitImport(JCImport tree) {
5580 // nothing to do
5581 }
5582
5583 public void visitModuleDef(JCModuleDecl tree) {
5584 tree.sym.completeUsesProvides();
5585 ModuleSymbol msym = tree.sym;
5586 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5587 Lint prevLint = chk.setLint(lint);
5588 chk.checkModuleName(tree);
5589 chk.checkDeprecatedAnnotation(tree, msym);
5590
5591 try {
5592 deferredLintHandler.flush(tree.pos(), lint);
5593 } finally {
5594 chk.setLint(prevLint);
5595 }
5596 }
5597
5598 /** Finish the attribution of a class. */
5599 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5600 JCClassDecl tree = (JCClassDecl)env.tree;
5601 Assert.check(c == tree.sym);
5602
5603 // Validate type parameters, supertype and interfaces.
5604 attribStats(tree.typarams, env);
5605 if (!c.isAnonymous()) {
5606 //already checked if anonymous
5607 chk.validate(tree.typarams, env);
5608 chk.validate(tree.extending, env);
5609 chk.validate(tree.implementing, env);
5610 }
5611
5612 c.markAbstractIfNeeded(types);
5613
5614 // If this is a non-abstract class, check that it has no abstract
5615 // methods or unimplemented methods of an implemented interface.
5616 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5617 chk.checkAllDefined(tree.pos(), c);
5618 }
5619
5620 if ((c.flags() & ANNOTATION) != 0) {
5621 if (tree.implementing.nonEmpty())
5622 log.error(tree.implementing.head.pos(),
5623 Errors.CantExtendIntfAnnotation);
5624 if (tree.typarams.nonEmpty()) {
5625 log.error(tree.typarams.head.pos(),
5626 Errors.IntfAnnotationCantHaveTypeParams(c));
5627 }
5628
5629 // If this annotation type has a @Repeatable, validate
5630 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5631 // If this annotation type has a @Repeatable, validate
5632 if (repeatable != null) {
5633 // get diagnostic position for error reporting
5634 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5635 Assert.checkNonNull(cbPos);
5636
5637 chk.validateRepeatable(c, repeatable, cbPos);
5638 }
5639 } else {
5640 // Check that all extended classes and interfaces
5641 // are compatible (i.e. no two define methods with same arguments
5642 // yet different return types). (JLS 8.4.8.3)
5643 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5644 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5645 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5646 }
5647
5648 // Check that class does not import the same parameterized interface
5649 // with two different argument lists.
5650 chk.checkClassBounds(tree.pos(), c.type);
5651
5652 tree.type = c.type;
5653
5654 for (List<JCTypeParameter> l = tree.typarams;
5655 l.nonEmpty(); l = l.tail) {
5656 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5657 }
5658
5659 // Check that a generic class doesn't extend Throwable
5660 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5661 log.error(tree.extending.pos(), Errors.GenericThrowable);
5662
5663 // Check that all methods which implement some
5664 // method conform to the method they implement.
5665 chk.checkImplementations(tree);
5666
5667 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5668 checkAutoCloseable(tree.pos(), env, c.type);
5669
5670 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5671 // Attribute declaration
5672 attribStat(l.head, env);
5673 // Check that declarations in inner classes are not static (JLS 8.1.2)
5674 // Make an exception for static constants.
5675 if (!allowRecords &&
5676 c.owner.kind != PCK &&
5677 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5678 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5679 VarSymbol sym = null;
5680 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5681 if (sym == null ||
5682 sym.kind != VAR ||
5683 sym.getConstValue() == null)
5684 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5685 }
5686 }
5687
5688 // Check for proper placement of super()/this() calls.
5689 chk.checkSuperInitCalls(tree);
5690
5691 // Check for cycles among non-initial constructors.
5692 chk.checkCyclicConstructors(tree);
5693
5694 // Check for cycles among annotation elements.
5695 chk.checkNonCyclicElements(tree);
5696
5697 // Check for proper use of serialVersionUID and other
5698 // serialization-related fields and methods
5699 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5700 && rs.isSerializable(c.type)
5701 && !c.isAnonymous()) {
5702 chk.checkSerialStructure(env, tree, c);
5703 }
5704 // Correctly organize the positions of the type annotations
5705 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5706
5707 // Check type annotations applicability rules
5708 validateTypeAnnotations(tree, false);
5709 }
5710 // where
5711 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5712 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5713 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5714 if (types.isSameType(al.head.annotationType.type, t))
5715 return al.head.pos();
5716 }
5717
5718 return null;
5719 }
5720
5721 private Type capture(Type type) {
5722 return types.capture(type);
5723 }
5724
5725 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5726 if (type.isErroneous()) {
5727 tree.vartype = make.at(Position.NOPOS).Erroneous();
5728 } else {
5729 tree.vartype = make.at(Position.NOPOS).Type(type);
5730 }
5731 }
5732
5733 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5734 tree.accept(new TypeAnnotationsValidator(sigOnly));
5735 }
5736 //where
5737 private final class TypeAnnotationsValidator extends TreeScanner {
5738
5739 private final boolean sigOnly;
5740 public TypeAnnotationsValidator(boolean sigOnly) {
5741 this.sigOnly = sigOnly;
5742 }
5743
5744 public void visitAnnotation(JCAnnotation tree) {
5745 chk.validateTypeAnnotation(tree, null, false);
5746 super.visitAnnotation(tree);
5747 }
5748 public void visitAnnotatedType(JCAnnotatedType tree) {
5749 if (!tree.underlyingType.type.isErroneous()) {
5750 super.visitAnnotatedType(tree);
5751 }
5752 }
5753 public void visitTypeParameter(JCTypeParameter tree) {
5754 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5755 scan(tree.bounds);
5756 // Don't call super.
5757 // This is needed because above we call validateTypeAnnotation with
5758 // false, which would forbid annotations on type parameters.
5759 // super.visitTypeParameter(tree);
5760 }
5761 public void visitMethodDef(JCMethodDecl tree) {
5762 if (tree.recvparam != null &&
5763 !tree.recvparam.vartype.type.isErroneous()) {
5764 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5765 }
5766 if (tree.restype != null && tree.restype.type != null) {
5767 validateAnnotatedType(tree.restype, tree.restype.type);
5768 }
5769 if (sigOnly) {
5770 scan(tree.mods);
5771 scan(tree.restype);
5772 scan(tree.typarams);
5773 scan(tree.recvparam);
5774 scan(tree.params);
5775 scan(tree.thrown);
5776 } else {
5777 scan(tree.defaultValue);
5778 scan(tree.body);
5779 }
5780 }
5781 public void visitVarDef(final JCVariableDecl tree) {
5782 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5783 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5784 validateAnnotatedType(tree.vartype, tree.sym.type);
5785 scan(tree.mods);
5786 scan(tree.vartype);
5787 if (!sigOnly) {
5788 scan(tree.init);
5789 }
5790 }
5791 public void visitTypeCast(JCTypeCast tree) {
5792 if (tree.clazz != null && tree.clazz.type != null)
5793 validateAnnotatedType(tree.clazz, tree.clazz.type);
5794 super.visitTypeCast(tree);
5795 }
5796 public void visitTypeTest(JCInstanceOf tree) {
5797 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5798 validateAnnotatedType(tree.pattern, tree.pattern.type);
5799 super.visitTypeTest(tree);
5800 }
5801 public void visitNewClass(JCNewClass tree) {
5802 if (tree.clazz != null && tree.clazz.type != null) {
5803 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5804 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5805 tree.clazz.type.tsym);
5806 }
5807 if (tree.def != null) {
5808 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5809 }
5810
5811 validateAnnotatedType(tree.clazz, tree.clazz.type);
5812 }
5813 super.visitNewClass(tree);
5814 }
5815 public void visitNewArray(JCNewArray tree) {
5816 if (tree.elemtype != null && tree.elemtype.type != null) {
5817 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5818 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5819 tree.elemtype.type.tsym);
5820 }
5821 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5822 }
5823 super.visitNewArray(tree);
5824 }
5825 public void visitClassDef(JCClassDecl tree) {
5826 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5827 if (sigOnly) {
5828 scan(tree.mods);
5829 scan(tree.typarams);
5830 scan(tree.extending);
5831 scan(tree.implementing);
5832 }
5833 for (JCTree member : tree.defs) {
5834 if (member.hasTag(Tag.CLASSDEF)) {
5835 continue;
5836 }
5837 scan(member);
5838 }
5839 }
5840 public void visitBlock(JCBlock tree) {
5841 if (!sigOnly) {
5842 scan(tree.stats);
5843 }
5844 }
5845
5846 /* I would want to model this after
5847 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5848 * and override visitSelect and visitTypeApply.
5849 * However, we only set the annotated type in the top-level type
5850 * of the symbol.
5851 * Therefore, we need to override each individual location where a type
5852 * can occur.
5853 */
5854 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5855 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5856
5857 if (type.isPrimitiveOrVoid()) {
5858 return;
5859 }
5860
5861 JCTree enclTr = errtree;
5862 Type enclTy = type;
5863
5864 boolean repeat = true;
5865 while (repeat) {
5866 if (enclTr.hasTag(TYPEAPPLY)) {
5867 List<Type> tyargs = enclTy.getTypeArguments();
5868 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5869 if (trargs.length() > 0) {
5870 // Nothing to do for diamonds
5871 if (tyargs.length() == trargs.length()) {
5872 for (int i = 0; i < tyargs.length(); ++i) {
5873 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5874 }
5875 }
5876 // If the lengths don't match, it's either a diamond
5877 // or some nested type that redundantly provides
5878 // type arguments in the tree.
5879 }
5880
5881 // Look at the clazz part of a generic type
5882 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5883 }
5884
5885 if (enclTr.hasTag(SELECT)) {
5886 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5887 if (enclTy != null &&
5888 !enclTy.hasTag(NONE)) {
5889 enclTy = enclTy.getEnclosingType();
5890 }
5891 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5892 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5893 if (enclTy == null || enclTy.hasTag(NONE)) {
5894 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5895 for (JCAnnotation an : at.getAnnotations()) {
5896 if (chk.isTypeAnnotation(an, false)) {
5897 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5898 }
5899 }
5900 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5901 if (!onlyTypeAnnotations.isEmpty()) {
5902 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5903 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5904 Fragments.TypeAnnotation(onlyTypeAnnotations);
5905 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5906 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5907 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5908 type.tsym.owner, annotatedType));
5909 }
5910 repeat = false;
5911 }
5912 enclTr = at.underlyingType;
5913 // enclTy doesn't need to be changed
5914 } else if (enclTr.hasTag(IDENT)) {
5915 repeat = false;
5916 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5917 JCWildcard wc = (JCWildcard) enclTr;
5918 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5919 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5920 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5921 } else {
5922 // Nothing to do for UNBOUND
5923 }
5924 repeat = false;
5925 } else if (enclTr.hasTag(TYPEARRAY)) {
5926 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5927 validateAnnotatedType(art.getType(), art.elemtype.type);
5928 repeat = false;
5929 } else if (enclTr.hasTag(TYPEUNION)) {
5930 JCTypeUnion ut = (JCTypeUnion) enclTr;
5931 for (JCTree t : ut.getTypeAlternatives()) {
5932 validateAnnotatedType(t, t.type);
5933 }
5934 repeat = false;
5935 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5936 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5937 for (JCTree t : it.getBounds()) {
5938 validateAnnotatedType(t, t.type);
5939 }
5940 repeat = false;
5941 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5942 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5943 repeat = false;
5944 } else {
5945 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5946 " within: "+ errtree + " with kind: " + errtree.getKind());
5947 }
5948 }
5949 }
5950
5951 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5952 Symbol sym) {
5953 // Ensure that no declaration annotations are present.
5954 // Note that a tree type might be an AnnotatedType with
5955 // empty annotations, if only declaration annotations were given.
5956 // This method will raise an error for such a type.
5957 for (JCAnnotation ai : annotations) {
5958 if (!ai.type.isErroneous() &&
5959 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5960 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5961 }
5962 }
5963 }
5964 }
5965
5966 // <editor-fold desc="post-attribution visitor">
5967
5968 /**
5969 * Handle missing types/symbols in an AST. This routine is useful when
5970 * the compiler has encountered some errors (which might have ended up
5971 * terminating attribution abruptly); if the compiler is used in fail-over
5972 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5973 * prevents NPE to be propagated during subsequent compilation steps.
5974 */
5975 public void postAttr(JCTree tree) {
5976 new PostAttrAnalyzer().scan(tree);
5977 }
5978
5979 class PostAttrAnalyzer extends TreeScanner {
5980
5981 private void initTypeIfNeeded(JCTree that) {
5982 if (that.type == null) {
5983 if (that.hasTag(METHODDEF)) {
5984 that.type = dummyMethodType((JCMethodDecl)that);
5985 } else {
5986 that.type = syms.unknownType;
5987 }
5988 }
5989 }
5990
5991 /* Construct a dummy method type. If we have a method declaration,
5992 * and the declared return type is void, then use that return type
5993 * instead of UNKNOWN to avoid spurious error messages in lambda
5994 * bodies (see:JDK-8041704).
5995 */
5996 private Type dummyMethodType(JCMethodDecl md) {
5997 Type restype = syms.unknownType;
5998 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5999 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6000 if (prim.typetag == VOID)
6001 restype = syms.voidType;
6002 }
6003 return new MethodType(List.nil(), restype,
6004 List.nil(), syms.methodClass);
6005 }
6006 private Type dummyMethodType() {
6007 return dummyMethodType(null);
6008 }
6009
6010 @Override
6011 public void scan(JCTree tree) {
6012 if (tree == null) return;
6013 if (tree instanceof JCExpression) {
6014 initTypeIfNeeded(tree);
6015 }
6016 super.scan(tree);
6017 }
6018
6019 @Override
6020 public void visitIdent(JCIdent that) {
6021 if (that.sym == null) {
6022 that.sym = syms.unknownSymbol;
6023 }
6024 }
6025
6026 @Override
6027 public void visitSelect(JCFieldAccess that) {
6028 if (that.sym == null) {
6029 that.sym = syms.unknownSymbol;
6030 }
6031 super.visitSelect(that);
6032 }
6033
6034 @Override
6035 public void visitClassDef(JCClassDecl that) {
6036 initTypeIfNeeded(that);
6037 if (that.sym == null) {
6038 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6039 }
6040 super.visitClassDef(that);
6041 }
6042
6043 @Override
6044 public void visitMethodDef(JCMethodDecl that) {
6045 initTypeIfNeeded(that);
6046 if (that.sym == null) {
6047 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6048 }
6049 super.visitMethodDef(that);
6050 }
6051
6052 @Override
6053 public void visitVarDef(JCVariableDecl that) {
6054 initTypeIfNeeded(that);
6055 if (that.sym == null) {
6056 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6057 that.sym.adr = 0;
6058 }
6059 if (that.vartype == null) {
6060 that.vartype = make.at(Position.NOPOS).Erroneous();
6061 }
6062 super.visitVarDef(that);
6063 }
6064
6065 @Override
6066 public void visitBindingPattern(JCBindingPattern that) {
6067 initTypeIfNeeded(that);
6068 initTypeIfNeeded(that.var);
6069 if (that.var.sym == null) {
6070 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6071 that.var.sym.adr = 0;
6072 }
6073 super.visitBindingPattern(that);
6074 }
6075
6076 @Override
6077 public void visitRecordPattern(JCRecordPattern that) {
6078 initTypeIfNeeded(that);
6079 if (that.record == null) {
6080 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6081 that.type, syms.noSymbol);
6082 }
6083 if (that.fullComponentTypes == null) {
6084 that.fullComponentTypes = List.nil();
6085 }
6086 super.visitRecordPattern(that);
6087 }
6088
6089 @Override
6090 public void visitNewClass(JCNewClass that) {
6091 if (that.constructor == null) {
6092 that.constructor = new MethodSymbol(0, names.init,
6093 dummyMethodType(), syms.noSymbol);
6094 }
6095 if (that.constructorType == null) {
6096 that.constructorType = syms.unknownType;
6097 }
6098 super.visitNewClass(that);
6099 }
6100
6101 @Override
6102 public void visitAssignop(JCAssignOp that) {
6103 if (that.operator == null) {
6104 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6105 -1, syms.noSymbol);
6106 }
6107 super.visitAssignop(that);
6108 }
6109
6110 @Override
6111 public void visitBinary(JCBinary that) {
6112 if (that.operator == null) {
6113 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6114 -1, syms.noSymbol);
6115 }
6116 super.visitBinary(that);
6117 }
6118
6119 @Override
6120 public void visitUnary(JCUnary that) {
6121 if (that.operator == null) {
6122 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6123 -1, syms.noSymbol);
6124 }
6125 super.visitUnary(that);
6126 }
6127
6128 @Override
6129 public void visitReference(JCMemberReference that) {
6130 super.visitReference(that);
6131 if (that.sym == null) {
6132 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6133 syms.noSymbol);
6134 }
6135 }
6136 }
6137 // </editor-fold>
6138
6139 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6140 new TreeScanner() {
6141 Symbol packge = pkg;
6142 @Override
6143 public void visitIdent(JCIdent that) {
6144 that.sym = packge;
6145 }
6146
6147 @Override
6148 public void visitSelect(JCFieldAccess that) {
6149 that.sym = packge;
6150 packge = packge.owner;
6151 super.visitSelect(that);
6152 }
6153 }.scan(pid);
6154 }
6155
6156 }