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