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 = new Log.DiscardDiagnosticHandler(log);
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.info.isNewClass &&
2500 env.enclMethod != null &&
2501 TreeInfo.isCompactConstructor(env.enclMethod)) {
2502 log.error(env.enclMethod,
2503 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2504 } else {
2505 // Attribute return expression, if it exists, and check that
2506 // it conforms to result type of enclosing method.
2507 if (tree.expr != null) {
2508 if (env.info.returnResult.pt.hasTag(VOID)) {
2509 env.info.returnResult.checkContext.report(tree.expr.pos(),
2510 diags.fragment(Fragments.UnexpectedRetVal));
2511 }
2512 attribTree(tree.expr, env, env.info.returnResult);
2513 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2514 !env.info.returnResult.pt.hasTag(NONE)) {
2515 env.info.returnResult.checkContext.report(tree.pos(),
2516 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2517 }
2518 }
2519 result = null;
2520 }
2521
2522 public void visitThrow(JCThrow tree) {
2523 Type owntype = attribExpr(tree.expr, env, Type.noType);
2524 chk.checkType(tree, owntype, syms.throwableType);
2525 result = null;
2526 }
2527
2528 public void visitAssert(JCAssert tree) {
2529 attribExpr(tree.cond, env, syms.booleanType);
2530 if (tree.detail != null) {
2531 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2532 }
2533 result = null;
2534 }
2535
2536 /** Visitor method for method invocations.
2537 * NOTE: The method part of an application will have in its type field
2538 * the return type of the method, not the method's type itself!
2539 */
2540 public void visitApply(JCMethodInvocation tree) {
2541 // The local environment of a method application is
2542 // a new environment nested in the current one.
2543 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2544
2545 // The types of the actual method arguments.
2546 List<Type> argtypes;
2547
2548 // The types of the actual method type arguments.
2549 List<Type> typeargtypes = null;
2550
2551 Name methName = TreeInfo.name(tree.meth);
2552
2553 boolean isConstructorCall =
2554 methName == names._this || methName == names._super;
2555
2556 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2557 if (isConstructorCall) {
2558
2559 // Attribute arguments, yielding list of argument types.
2560 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2561 argtypes = argtypesBuf.toList();
2562 typeargtypes = attribTypes(tree.typeargs, localEnv);
2563
2564 // Done with this()/super() parameters. End of constructor prologue.
2565 env.info.ctorPrologue = false;
2566
2567 // Variable `site' points to the class in which the called
2568 // constructor is defined.
2569 Type site = env.enclClass.sym.type;
2570 if (methName == names._super) {
2571 if (site == syms.objectType) {
2572 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2573 site = types.createErrorType(syms.objectType);
2574 } else {
2575 site = types.supertype(site);
2576 }
2577 }
2578
2579 if (site.hasTag(CLASS)) {
2580 Type encl = site.getEnclosingType();
2581 while (encl != null && encl.hasTag(TYPEVAR))
2582 encl = encl.getUpperBound();
2583 if (encl.hasTag(CLASS)) {
2584 // we are calling a nested class
2585
2586 if (tree.meth.hasTag(SELECT)) {
2587 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2588
2589 // We are seeing a prefixed call, of the form
2590 // <expr>.super(...).
2591 // Check that the prefix expression conforms
2592 // to the outer instance type of the class.
2593 chk.checkRefType(qualifier.pos(),
2594 attribExpr(qualifier, localEnv,
2595 encl));
2596 }
2597 } else if (tree.meth.hasTag(SELECT)) {
2598 log.error(tree.meth.pos(),
2599 Errors.IllegalQualNotIcls(site.tsym));
2600 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2601 }
2602
2603 if (tree.meth.hasTag(IDENT)) {
2604 // non-qualified super(...) call; check whether explicit constructor
2605 // invocation is well-formed. If the super class is an inner class,
2606 // make sure that an appropriate implicit qualifier exists. If the super
2607 // class is a local class, make sure that the current class is defined
2608 // in the same context as the local class.
2609 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2610 }
2611
2612 // if we're calling a java.lang.Enum constructor,
2613 // prefix the implicit String and int parameters
2614 if (site.tsym == syms.enumSym)
2615 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2616
2617 // Resolve the called constructor under the assumption
2618 // that we are referring to a superclass instance of the
2619 // current instance (JLS ???).
2620 boolean selectSuperPrev = localEnv.info.selectSuper;
2621 localEnv.info.selectSuper = true;
2622 localEnv.info.pendingResolutionPhase = null;
2623 Symbol sym = rs.resolveConstructor(
2624 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2625 localEnv.info.selectSuper = selectSuperPrev;
2626
2627 // Set method symbol to resolved constructor...
2628 TreeInfo.setSymbol(tree.meth, sym);
2629
2630 // ...and check that it is legal in the current context.
2631 // (this will also set the tree's type)
2632 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2633 checkId(tree.meth, site, sym, localEnv,
2634 new ResultInfo(kind, mpt));
2635 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2636 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2637 }
2638 // Otherwise, `site' is an error type and we do nothing
2639 result = tree.type = syms.voidType;
2640 } else {
2641 // Otherwise, we are seeing a regular method call.
2642 // Attribute the arguments, yielding list of argument types, ...
2643 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2644 argtypes = argtypesBuf.toList();
2645 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2646
2647 // ... and attribute the method using as a prototype a methodtype
2648 // whose formal argument types is exactly the list of actual
2649 // arguments (this will also set the method symbol).
2650 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2651 localEnv.info.pendingResolutionPhase = null;
2652 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2653
2654 // Compute the result type.
2655 Type restype = mtype.getReturnType();
2656 if (restype.hasTag(WILDCARD))
2657 throw new AssertionError(mtype);
2658
2659 Type qualifier = (tree.meth.hasTag(SELECT))
2660 ? ((JCFieldAccess) tree.meth).selected.type
2661 : env.enclClass.sym.type;
2662 Symbol msym = TreeInfo.symbol(tree.meth);
2663 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2664
2665 chk.checkRefTypes(tree.typeargs, typeargtypes);
2666
2667 // Check that value of resulting type is admissible in the
2668 // current context. Also, capture the return type
2669 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2670 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2671 }
2672 chk.validate(tree.typeargs, localEnv);
2673 }
2674 //where
2675 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2676 if (msym != null &&
2677 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2678 methodName == names.getClass &&
2679 argtypes.isEmpty()) {
2680 // as a special case, x.getClass() has type Class<? extends |X|>
2681 return new ClassType(restype.getEnclosingType(),
2682 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2683 BoundKind.EXTENDS,
2684 syms.boundClass)),
2685 restype.tsym,
2686 restype.getMetadata());
2687 } else if (msym != null &&
2688 msym.owner == syms.arrayClass &&
2689 methodName == names.clone &&
2690 types.isArray(qualifierType)) {
2691 // as a special case, array.clone() has a result that is
2692 // the same as static type of the array being cloned
2693 return qualifierType;
2694 } else {
2695 return restype;
2696 }
2697 }
2698
2699 /** Obtain a method type with given argument types.
2700 */
2701 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2702 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2703 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2704 }
2705
2706 public void visitNewClass(final JCNewClass tree) {
2707 Type owntype = types.createErrorType(tree.type);
2708
2709 // The local environment of a class creation is
2710 // a new environment nested in the current one.
2711 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2712
2713 // The anonymous inner class definition of the new expression,
2714 // if one is defined by it.
2715 JCClassDecl cdef = tree.def;
2716
2717 // If enclosing class is given, attribute it, and
2718 // complete class name to be fully qualified
2719 JCExpression clazz = tree.clazz; // Class field following new
2720 JCExpression clazzid; // Identifier in class field
2721 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2722 annoclazzid = null;
2723
2724 if (clazz.hasTag(TYPEAPPLY)) {
2725 clazzid = ((JCTypeApply) clazz).clazz;
2726 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2727 annoclazzid = (JCAnnotatedType) clazzid;
2728 clazzid = annoclazzid.underlyingType;
2729 }
2730 } else {
2731 if (clazz.hasTag(ANNOTATED_TYPE)) {
2732 annoclazzid = (JCAnnotatedType) clazz;
2733 clazzid = annoclazzid.underlyingType;
2734 } else {
2735 clazzid = clazz;
2736 }
2737 }
2738
2739 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2740
2741 if (tree.encl != null) {
2742 // We are seeing a qualified new, of the form
2743 // <expr>.new C <...> (...) ...
2744 // In this case, we let clazz stand for the name of the
2745 // allocated class C prefixed with the type of the qualifier
2746 // expression, so that we can
2747 // resolve it with standard techniques later. I.e., if
2748 // <expr> has type T, then <expr>.new C <...> (...)
2749 // yields a clazz T.C.
2750 Type encltype = chk.checkRefType(tree.encl.pos(),
2751 attribExpr(tree.encl, env));
2752 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2753 // from expr to the combined type, or not? Yes, do this.
2754 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2755 ((JCIdent) clazzid).name);
2756
2757 EndPosTable endPosTable = this.env.toplevel.endPositions;
2758 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2759 if (clazz.hasTag(ANNOTATED_TYPE)) {
2760 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2761 List<JCAnnotation> annos = annoType.annotations;
2762
2763 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2764 clazzid1 = make.at(tree.pos).
2765 TypeApply(clazzid1,
2766 ((JCTypeApply) clazz).arguments);
2767 }
2768
2769 clazzid1 = make.at(tree.pos).
2770 AnnotatedType(annos, clazzid1);
2771 } else if (clazz.hasTag(TYPEAPPLY)) {
2772 clazzid1 = make.at(tree.pos).
2773 TypeApply(clazzid1,
2774 ((JCTypeApply) clazz).arguments);
2775 }
2776
2777 clazz = clazzid1;
2778 }
2779
2780 // Attribute clazz expression and store
2781 // symbol + type back into the attributed tree.
2782 Type clazztype;
2783
2784 try {
2785 env.info.isNewClass = true;
2786 clazztype = TreeInfo.isEnumInit(env.tree) ?
2787 attribIdentAsEnumType(env, (JCIdent)clazz) :
2788 attribType(clazz, env);
2789 } finally {
2790 env.info.isNewClass = false;
2791 }
2792
2793 clazztype = chk.checkDiamond(tree, clazztype);
2794 chk.validate(clazz, localEnv);
2795 if (tree.encl != null) {
2796 // We have to work in this case to store
2797 // symbol + type back into the attributed tree.
2798 tree.clazz.type = clazztype;
2799 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2800 clazzid.type = ((JCIdent) clazzid).sym.type;
2801 if (annoclazzid != null) {
2802 annoclazzid.type = clazzid.type;
2803 }
2804 if (!clazztype.isErroneous()) {
2805 if (cdef != null && clazztype.tsym.isInterface()) {
2806 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2807 } else if (clazztype.tsym.isStatic()) {
2808 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2809 }
2810 }
2811 } else {
2812 // Check for the existence of an apropos outer instance
2813 checkNewInnerClass(tree.pos(), env, clazztype, false);
2814 }
2815
2816 // Attribute constructor arguments.
2817 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2818 final KindSelector pkind =
2819 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2820 List<Type> argtypes = argtypesBuf.toList();
2821 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2822
2823 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2824 // Enums may not be instantiated except implicitly
2825 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2826 (!env.tree.hasTag(VARDEF) ||
2827 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2828 ((JCVariableDecl) env.tree).init != tree))
2829 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2830
2831 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2832 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2833 boolean skipNonDiamondPath = false;
2834 // Check that class is not abstract
2835 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2836 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2837 log.error(tree.pos(),
2838 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2839 skipNonDiamondPath = true;
2840 } else if (cdef != null && clazztype.tsym.isInterface()) {
2841 // Check that no constructor arguments are given to
2842 // anonymous classes implementing an interface
2843 if (!argtypes.isEmpty())
2844 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2845
2846 if (!typeargtypes.isEmpty())
2847 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2848
2849 // Error recovery: pretend no arguments were supplied.
2850 argtypes = List.nil();
2851 typeargtypes = List.nil();
2852 skipNonDiamondPath = true;
2853 }
2854 if (TreeInfo.isDiamond(tree)) {
2855 ClassType site = new ClassType(clazztype.getEnclosingType(),
2856 clazztype.tsym.type.getTypeArguments(),
2857 clazztype.tsym,
2858 clazztype.getMetadata());
2859
2860 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2861 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2862 diamondEnv.info.pendingResolutionPhase = null;
2863
2864 //if the type of the instance creation expression is a class type
2865 //apply method resolution inference (JLS 15.12.2.7). The return type
2866 //of the resolved constructor will be a partially instantiated type
2867 Symbol constructor = rs.resolveDiamond(tree.pos(),
2868 diamondEnv,
2869 site,
2870 argtypes,
2871 typeargtypes);
2872 tree.constructor = constructor.baseSymbol();
2873
2874 final TypeSymbol csym = clazztype.tsym;
2875 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2876 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2877 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2878 constructorType = checkId(tree, site,
2879 constructor,
2880 diamondEnv,
2881 diamondResult);
2882
2883 tree.clazz.type = types.createErrorType(clazztype);
2884 if (!constructorType.isErroneous()) {
2885 tree.clazz.type = clazz.type = constructorType.getReturnType();
2886 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2887 }
2888 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2889 }
2890
2891 // Resolve the called constructor under the assumption
2892 // that we are referring to a superclass instance of the
2893 // current instance (JLS ???).
2894 else if (!skipNonDiamondPath) {
2895 //the following code alters some of the fields in the current
2896 //AttrContext - hence, the current context must be dup'ed in
2897 //order to avoid downstream failures
2898 Env<AttrContext> rsEnv = localEnv.dup(tree);
2899 rsEnv.info.selectSuper = cdef != null;
2900 rsEnv.info.pendingResolutionPhase = null;
2901 tree.constructor = rs.resolveConstructor(
2902 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2903 if (cdef == null) { //do not check twice!
2904 tree.constructorType = checkId(tree,
2905 clazztype,
2906 tree.constructor,
2907 rsEnv,
2908 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2909 if (rsEnv.info.lastResolveVarargs())
2910 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2911 }
2912 }
2913
2914 if (cdef != null) {
2915 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2916 return;
2917 }
2918
2919 if (tree.constructor != null && tree.constructor.kind == MTH)
2920 owntype = clazztype;
2921 }
2922 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2923 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2924 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2925 //we need to wait for inference to finish and then replace inference vars in the constructor type
2926 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2927 instantiatedContext -> {
2928 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2929 });
2930 }
2931 chk.validate(tree.typeargs, localEnv);
2932 }
2933
2934 // where
2935 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2936 JCClassDecl cdef, Env<AttrContext> localEnv,
2937 List<Type> argtypes, List<Type> typeargtypes,
2938 KindSelector pkind) {
2939 // We are seeing an anonymous class instance creation.
2940 // In this case, the class instance creation
2941 // expression
2942 //
2943 // E.new <typeargs1>C<typargs2>(args) { ... }
2944 //
2945 // is represented internally as
2946 //
2947 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2948 //
2949 // This expression is then *transformed* as follows:
2950 //
2951 // (1) add an extends or implements clause
2952 // (2) add a constructor.
2953 //
2954 // For instance, if C is a class, and ET is the type of E,
2955 // the expression
2956 //
2957 // E.new <typeargs1>C<typargs2>(args) { ... }
2958 //
2959 // is translated to (where X is a fresh name and typarams is the
2960 // parameter list of the super constructor):
2961 //
2962 // new <typeargs1>X(<*nullchk*>E, args) where
2963 // X extends C<typargs2> {
2964 // <typarams> X(ET e, args) {
2965 // e.<typeargs1>super(args)
2966 // }
2967 // ...
2968 // }
2969 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2970 Type enclType = clazztype.getEnclosingType();
2971 if (enclType != null &&
2972 enclType.hasTag(CLASS) &&
2973 !chk.checkDenotable((ClassType)enclType)) {
2974 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2975 }
2976 final boolean isDiamond = TreeInfo.isDiamond(tree);
2977 if (isDiamond
2978 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2979 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2980 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2981 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2982 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2983 instantiatedContext -> {
2984 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2985 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2986 ResultInfo prevResult = this.resultInfo;
2987 try {
2988 this.resultInfo = resultInfoForClassDefinition;
2989 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2990 dupLocalEnv, argtypes, typeargtypes, pkind);
2991 } finally {
2992 this.resultInfo = prevResult;
2993 }
2994 });
2995 } else {
2996 if (isDiamond && clazztype.hasTag(CLASS)) {
2997 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2998 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2999 // One or more types inferred in the previous steps is non-denotable.
3000 Fragment fragment = Diamond(clazztype.tsym);
3001 log.error(tree.clazz.pos(),
3002 Errors.CantApplyDiamond1(
3003 fragment,
3004 invalidDiamondArgs.size() > 1 ?
3005 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3006 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3007 }
3008 // For <>(){}, inferred types must also be accessible.
3009 for (Type t : clazztype.getTypeArguments()) {
3010 rs.checkAccessibleType(env, t);
3011 }
3012 }
3013
3014 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3015 // false for isInterface call even when the original type is an interface.
3016 boolean implementing = clazztype.tsym.isInterface() ||
3017 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3018 clazztype.getOriginalType().tsym.isInterface();
3019
3020 if (implementing) {
3021 cdef.implementing = List.of(clazz);
3022 } else {
3023 cdef.extending = clazz;
3024 }
3025
3026 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3027 rs.isSerializable(clazztype)) {
3028 localEnv.info.isSerializable = true;
3029 }
3030
3031 attribStat(cdef, localEnv);
3032
3033 List<Type> finalargtypes;
3034 // If an outer instance is given,
3035 // prefix it to the constructor arguments
3036 // and delete it from the new expression
3037 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3038 finalargtypes = argtypes.prepend(tree.encl.type);
3039 } else {
3040 finalargtypes = argtypes;
3041 }
3042
3043 // Reassign clazztype and recompute constructor. As this necessarily involves
3044 // another attribution pass for deferred types in the case of <>, replicate
3045 // them. Original arguments have right decorations already.
3046 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3047 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3048 }
3049
3050 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3051 : cdef.sym.type;
3052 Symbol sym = tree.constructor = rs.resolveConstructor(
3053 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3054 Assert.check(!sym.kind.isResolutionError());
3055 tree.constructor = sym;
3056 tree.constructorType = checkId(tree,
3057 clazztype,
3058 tree.constructor,
3059 localEnv,
3060 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3061 }
3062 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3063 clazztype : types.createErrorType(tree.type);
3064 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3065 chk.validate(tree.typeargs, localEnv);
3066 }
3067
3068 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3069 return new Check.NestedCheckContext(checkContext) {
3070 @Override
3071 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3072 enclosingContext.report(clazz.clazz,
3073 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3074 }
3075 };
3076 }
3077
3078 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3079 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3080 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3081 (!isLocal && !type.tsym.isInner()) ||
3082 (isSuper && env.enclClass.sym.isAnonymous())) {
3083 // nothing to check
3084 return;
3085 }
3086 Symbol res = isLocal ?
3087 rs.findLocalClassOwner(env, type.tsym) :
3088 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3089 if (res.exists()) {
3090 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3091 } else {
3092 log.error(pos, Errors.EnclClassRequired(type.tsym));
3093 }
3094 }
3095
3096 /** Make an attributed null check tree.
3097 */
3098 public JCExpression makeNullCheck(JCExpression arg) {
3099 // optimization: new Outer() can never be null; skip null check
3100 if (arg.getTag() == NEWCLASS)
3101 return arg;
3102 // optimization: X.this is never null; skip null check
3103 Name name = TreeInfo.name(arg);
3104 if (name == names._this || name == names._super) return arg;
3105
3106 JCTree.Tag optag = NULLCHK;
3107 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3108 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3109 tree.type = arg.type;
3110 return tree;
3111 }
3112
3113 public void visitNewArray(JCNewArray tree) {
3114 Type owntype = types.createErrorType(tree.type);
3115 Env<AttrContext> localEnv = env.dup(tree);
3116 Type elemtype;
3117 if (tree.elemtype != null) {
3118 elemtype = attribType(tree.elemtype, localEnv);
3119 chk.validate(tree.elemtype, localEnv);
3120 owntype = elemtype;
3121 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3122 attribExpr(l.head, localEnv, syms.intType);
3123 owntype = new ArrayType(owntype, syms.arrayClass);
3124 }
3125 } else {
3126 // we are seeing an untyped aggregate { ... }
3127 // this is allowed only if the prototype is an array
3128 if (pt().hasTag(ARRAY)) {
3129 elemtype = types.elemtype(pt());
3130 } else {
3131 if (!pt().hasTag(ERROR) &&
3132 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3133 log.error(tree.pos(),
3134 Errors.IllegalInitializerForType(pt()));
3135 }
3136 elemtype = types.createErrorType(pt());
3137 }
3138 }
3139 if (tree.elems != null) {
3140 attribExprs(tree.elems, localEnv, elemtype);
3141 owntype = new ArrayType(elemtype, syms.arrayClass);
3142 }
3143 if (!types.isReifiable(elemtype))
3144 log.error(tree.pos(), Errors.GenericArrayCreation);
3145 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3146 }
3147
3148 /*
3149 * A lambda expression can only be attributed when a target-type is available.
3150 * In addition, if the target-type is that of a functional interface whose
3151 * descriptor contains inference variables in argument position the lambda expression
3152 * is 'stuck' (see DeferredAttr).
3153 */
3154 @Override
3155 public void visitLambda(final JCLambda that) {
3156 boolean wrongContext = false;
3157 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3158 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3159 //lambda only allowed in assignment or method invocation/cast context
3160 log.error(that.pos(), Errors.UnexpectedLambda);
3161 }
3162 resultInfo = recoveryInfo;
3163 wrongContext = true;
3164 }
3165 //create an environment for attribution of the lambda expression
3166 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3167 boolean needsRecovery =
3168 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3169 try {
3170 if (needsRecovery && rs.isSerializable(pt())) {
3171 localEnv.info.isSerializable = true;
3172 localEnv.info.isSerializableLambda = true;
3173 }
3174 List<Type> explicitParamTypes = null;
3175 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3176 //attribute lambda parameters
3177 attribStats(that.params, localEnv);
3178 explicitParamTypes = TreeInfo.types(that.params);
3179 }
3180
3181 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3182 Type currentTarget = targetInfo.target;
3183 Type lambdaType = targetInfo.descriptor;
3184
3185 if (currentTarget.isErroneous()) {
3186 result = that.type = currentTarget;
3187 return;
3188 }
3189
3190 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3191
3192 if (lambdaType.hasTag(FORALL)) {
3193 //lambda expression target desc cannot be a generic method
3194 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3195 kindName(currentTarget.tsym),
3196 currentTarget.tsym);
3197 resultInfo.checkContext.report(that, diags.fragment(msg));
3198 result = that.type = types.createErrorType(pt());
3199 return;
3200 }
3201
3202 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3203 //add param type info in the AST
3204 List<Type> actuals = lambdaType.getParameterTypes();
3205 List<JCVariableDecl> params = that.params;
3206
3207 boolean arityMismatch = false;
3208
3209 while (params.nonEmpty()) {
3210 if (actuals.isEmpty()) {
3211 //not enough actuals to perform lambda parameter inference
3212 arityMismatch = true;
3213 }
3214 //reset previously set info
3215 Type argType = arityMismatch ?
3216 syms.errType :
3217 actuals.head;
3218 if (params.head.isImplicitlyTyped()) {
3219 setSyntheticVariableType(params.head, argType);
3220 }
3221 params.head.sym = null;
3222 actuals = actuals.isEmpty() ?
3223 actuals :
3224 actuals.tail;
3225 params = params.tail;
3226 }
3227
3228 //attribute lambda parameters
3229 attribStats(that.params, localEnv);
3230
3231 if (arityMismatch) {
3232 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3233 result = that.type = types.createErrorType(currentTarget);
3234 return;
3235 }
3236 }
3237
3238 //from this point on, no recovery is needed; if we are in assignment context
3239 //we will be able to attribute the whole lambda body, regardless of errors;
3240 //if we are in a 'check' method context, and the lambda is not compatible
3241 //with the target-type, it will be recovered anyway in Attr.checkId
3242 needsRecovery = false;
3243
3244 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3245 lambdaBodyResult(that, lambdaType, resultInfo);
3246
3247 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3248 attribTree(that.getBody(), localEnv, bodyResultInfo);
3249 } else {
3250 JCBlock body = (JCBlock)that.body;
3251 if (body == breakTree &&
3252 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3253 breakTreeFound(copyEnv(localEnv));
3254 }
3255 attribStats(body.stats, localEnv);
3256 }
3257
3258 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3259
3260 boolean isSpeculativeRound =
3261 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3262
3263 preFlow(that);
3264 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3265
3266 that.type = currentTarget; //avoids recovery at this stage
3267 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3268
3269 if (!isSpeculativeRound) {
3270 //add thrown types as bounds to the thrown types free variables if needed:
3271 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3272 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3273 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3274 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3275 }
3276 }
3277
3278 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3279 }
3280 result = wrongContext ? that.type = types.createErrorType(pt())
3281 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3282 } catch (Types.FunctionDescriptorLookupError ex) {
3283 JCDiagnostic cause = ex.getDiagnostic();
3284 resultInfo.checkContext.report(that, cause);
3285 result = that.type = types.createErrorType(pt());
3286 return;
3287 } catch (CompletionFailure cf) {
3288 chk.completionError(that.pos(), cf);
3289 } catch (Throwable t) {
3290 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3291 //as that would likely cause the same exception again.
3292 needsRecovery = false;
3293 throw t;
3294 } finally {
3295 localEnv.info.scope.leave();
3296 if (needsRecovery) {
3297 Type prevResult = result;
3298 try {
3299 attribTree(that, env, recoveryInfo);
3300 } finally {
3301 if (result == Type.recoveryType) {
3302 result = prevResult;
3303 }
3304 }
3305 }
3306 }
3307 }
3308 //where
3309 class TargetInfo {
3310 Type target;
3311 Type descriptor;
3312
3313 public TargetInfo(Type target, Type descriptor) {
3314 this.target = target;
3315 this.descriptor = descriptor;
3316 }
3317 }
3318
3319 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3320 Type lambdaType;
3321 Type currentTarget = resultInfo.pt;
3322 if (resultInfo.pt != Type.recoveryType) {
3323 /* We need to adjust the target. If the target is an
3324 * intersection type, for example: SAM & I1 & I2 ...
3325 * the target will be updated to SAM
3326 */
3327 currentTarget = targetChecker.visit(currentTarget, that);
3328 if (!currentTarget.isIntersection()) {
3329 if (explicitParamTypes != null) {
3330 currentTarget = infer.instantiateFunctionalInterface(that,
3331 currentTarget, explicitParamTypes, resultInfo.checkContext);
3332 }
3333 currentTarget = types.removeWildcards(currentTarget);
3334 lambdaType = types.findDescriptorType(currentTarget);
3335 } else {
3336 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3337 ListBuffer<Type> components = new ListBuffer<>();
3338 for (Type bound : ict.getExplicitComponents()) {
3339 if (explicitParamTypes != null) {
3340 try {
3341 bound = infer.instantiateFunctionalInterface(that,
3342 bound, explicitParamTypes, resultInfo.checkContext);
3343 } catch (FunctionDescriptorLookupError t) {
3344 // do nothing
3345 }
3346 }
3347 bound = types.removeWildcards(bound);
3348 components.add(bound);
3349 }
3350 currentTarget = types.makeIntersectionType(components.toList());
3351 currentTarget.tsym.flags_field |= INTERFACE;
3352 lambdaType = types.findDescriptorType(currentTarget);
3353 }
3354
3355 } else {
3356 currentTarget = Type.recoveryType;
3357 lambdaType = fallbackDescriptorType(that);
3358 }
3359 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3360 //lambda expression target desc cannot be a generic method
3361 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3362 kindName(currentTarget.tsym),
3363 currentTarget.tsym);
3364 resultInfo.checkContext.report(that, diags.fragment(msg));
3365 currentTarget = types.createErrorType(pt());
3366 }
3367 return new TargetInfo(currentTarget, lambdaType);
3368 }
3369
3370 void preFlow(JCLambda tree) {
3371 attrRecover.doRecovery();
3372 new PostAttrAnalyzer() {
3373 @Override
3374 public void scan(JCTree tree) {
3375 if (tree == null ||
3376 (tree.type != null &&
3377 tree.type == Type.stuckType)) {
3378 //don't touch stuck expressions!
3379 return;
3380 }
3381 super.scan(tree);
3382 }
3383
3384 @Override
3385 public void visitClassDef(JCClassDecl that) {
3386 // or class declaration trees!
3387 }
3388
3389 public void visitLambda(JCLambda that) {
3390 // or lambda expressions!
3391 }
3392 }.scan(tree.body);
3393 }
3394
3395 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3396
3397 @Override
3398 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3399 return t.isIntersection() ?
3400 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3401 }
3402
3403 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3404 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3405 return ict;
3406 }
3407
3408 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3409 ListBuffer<Type> targs = new ListBuffer<>();
3410 ListBuffer<Type> supertypes = new ListBuffer<>();
3411 for (Type i : ict.interfaces_field) {
3412 if (i.isParameterized()) {
3413 targs.appendList(i.tsym.type.allparams());
3414 }
3415 supertypes.append(i.tsym.type);
3416 }
3417 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3418 notionalIntf.allparams_field = targs.toList();
3419 notionalIntf.tsym.flags_field |= INTERFACE;
3420 return notionalIntf.tsym;
3421 }
3422 };
3423
3424 private Type fallbackDescriptorType(JCExpression tree) {
3425 switch (tree.getTag()) {
3426 case LAMBDA:
3427 JCLambda lambda = (JCLambda)tree;
3428 List<Type> argtypes = List.nil();
3429 for (JCVariableDecl param : lambda.params) {
3430 argtypes = param.vartype != null && param.vartype.type != null ?
3431 argtypes.append(param.vartype.type) :
3432 argtypes.append(syms.errType);
3433 }
3434 return new MethodType(argtypes, Type.recoveryType,
3435 List.of(syms.throwableType), syms.methodClass);
3436 case REFERENCE:
3437 return new MethodType(List.nil(), Type.recoveryType,
3438 List.of(syms.throwableType), syms.methodClass);
3439 default:
3440 Assert.error("Cannot get here!");
3441 }
3442 return null;
3443 }
3444
3445 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3446 final InferenceContext inferenceContext, final Type... ts) {
3447 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3448 }
3449
3450 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3451 final InferenceContext inferenceContext, final List<Type> ts) {
3452 if (inferenceContext.free(ts)) {
3453 inferenceContext.addFreeTypeListener(ts,
3454 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3455 } else {
3456 for (Type t : ts) {
3457 rs.checkAccessibleType(env, t);
3458 }
3459 }
3460 }
3461
3462 /**
3463 * Lambda/method reference have a special check context that ensures
3464 * that i.e. a lambda return type is compatible with the expected
3465 * type according to both the inherited context and the assignment
3466 * context.
3467 */
3468 class FunctionalReturnContext extends Check.NestedCheckContext {
3469
3470 FunctionalReturnContext(CheckContext enclosingContext) {
3471 super(enclosingContext);
3472 }
3473
3474 @Override
3475 public boolean compatible(Type found, Type req, Warner warn) {
3476 //return type must be compatible in both current context and assignment context
3477 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3478 }
3479
3480 @Override
3481 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3482 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3483 }
3484 }
3485
3486 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3487
3488 JCExpression expr;
3489 boolean expStmtExpected;
3490
3491 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3492 super(enclosingContext);
3493 this.expr = expr;
3494 }
3495
3496 @Override
3497 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3498 if (expStmtExpected) {
3499 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3500 } else {
3501 super.report(pos, details);
3502 }
3503 }
3504
3505 @Override
3506 public boolean compatible(Type found, Type req, Warner warn) {
3507 //a void return is compatible with an expression statement lambda
3508 if (req.hasTag(VOID)) {
3509 expStmtExpected = true;
3510 return TreeInfo.isExpressionStatement(expr);
3511 } else {
3512 return super.compatible(found, req, warn);
3513 }
3514 }
3515 }
3516
3517 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3518 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3519 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3520 new FunctionalReturnContext(resultInfo.checkContext);
3521
3522 return descriptor.getReturnType() == Type.recoveryType ?
3523 recoveryInfo :
3524 new ResultInfo(KindSelector.VAL,
3525 descriptor.getReturnType(), funcContext);
3526 }
3527
3528 /**
3529 * Lambda compatibility. Check that given return types, thrown types, parameter types
3530 * are compatible with the expected functional interface descriptor. This means that:
3531 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3532 * types must be compatible with the return type of the expected descriptor.
3533 */
3534 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3535 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3536
3537 //return values have already been checked - but if lambda has no return
3538 //values, we must ensure that void/value compatibility is correct;
3539 //this amounts at checking that, if a lambda body can complete normally,
3540 //the descriptor's return type must be void
3541 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3542 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3543 Fragment msg =
3544 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3545 checkContext.report(tree,
3546 diags.fragment(msg));
3547 }
3548
3549 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3550 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3551 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3552 }
3553 }
3554
3555 /* This method returns an environment to be used to attribute a lambda
3556 * expression.
3557 *
3558 * The owner of this environment is a method symbol. If the current owner
3559 * is not a method (e.g. if the lambda occurs in a field initializer), then
3560 * a synthetic method symbol owner is created.
3561 */
3562 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3563 Env<AttrContext> lambdaEnv;
3564 Symbol owner = env.info.scope.owner;
3565 if (owner.kind == VAR && owner.owner.kind == TYP) {
3566 // If the lambda is nested in a field initializer, we need to create a fake init method.
3567 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3568 // init symbol's owner).
3569 ClassSymbol enclClass = owner.enclClass();
3570 Name initName = owner.isStatic() ? names.clinit : names.init;
3571 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3572 initName, initBlockType, enclClass);
3573 initSym.params = List.nil();
3574 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3575 } else {
3576 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3577 }
3578 lambdaEnv.info.yieldResult = null;
3579 lambdaEnv.info.isLambda = true;
3580 return lambdaEnv;
3581 }
3582
3583 @Override
3584 public void visitReference(final JCMemberReference that) {
3585 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3586 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3587 //method reference only allowed in assignment or method invocation/cast context
3588 log.error(that.pos(), Errors.UnexpectedMref);
3589 }
3590 result = that.type = types.createErrorType(pt());
3591 return;
3592 }
3593 final Env<AttrContext> localEnv = env.dup(that);
3594 try {
3595 //attribute member reference qualifier - if this is a constructor
3596 //reference, the expected kind must be a type
3597 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3598
3599 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3600 exprType = chk.checkConstructorRefType(that.expr, exprType);
3601 if (!exprType.isErroneous() &&
3602 exprType.isRaw() &&
3603 that.typeargs != null) {
3604 log.error(that.expr.pos(),
3605 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3606 Fragments.MrefInferAndExplicitParams));
3607 exprType = types.createErrorType(exprType);
3608 }
3609 }
3610
3611 if (exprType.isErroneous()) {
3612 //if the qualifier expression contains problems,
3613 //give up attribution of method reference
3614 result = that.type = exprType;
3615 return;
3616 }
3617
3618 if (TreeInfo.isStaticSelector(that.expr, names)) {
3619 //if the qualifier is a type, validate it; raw warning check is
3620 //omitted as we don't know at this stage as to whether this is a
3621 //raw selector (because of inference)
3622 chk.validate(that.expr, env, false);
3623 } else {
3624 Symbol lhsSym = TreeInfo.symbol(that.expr);
3625 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3626 }
3627 //attrib type-arguments
3628 List<Type> typeargtypes = List.nil();
3629 if (that.typeargs != null) {
3630 typeargtypes = attribTypes(that.typeargs, localEnv);
3631 }
3632
3633 boolean isTargetSerializable =
3634 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3635 rs.isSerializable(pt());
3636 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3637 Type currentTarget = targetInfo.target;
3638 Type desc = targetInfo.descriptor;
3639
3640 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3641 List<Type> argtypes = desc.getParameterTypes();
3642 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3643
3644 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3645 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3646 }
3647
3648 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3649 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3650 try {
3651 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3652 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3653 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3654 } finally {
3655 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3656 }
3657
3658 Symbol refSym = refResult.fst;
3659 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3660
3661 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3662 * JDK-8075541
3663 */
3664 if (refSym.kind != MTH) {
3665 boolean targetError;
3666 switch (refSym.kind) {
3667 case ABSENT_MTH:
3668 targetError = false;
3669 break;
3670 case WRONG_MTH:
3671 case WRONG_MTHS:
3672 case AMBIGUOUS:
3673 case HIDDEN:
3674 case STATICERR:
3675 targetError = true;
3676 break;
3677 default:
3678 Assert.error("unexpected result kind " + refSym.kind);
3679 targetError = false;
3680 }
3681
3682 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3683 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3684 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3685
3686 JCDiagnostic diag = diags.create(log.currentSource(), that,
3687 targetError ?
3688 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3689 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3690
3691 if (targetError && currentTarget == Type.recoveryType) {
3692 //a target error doesn't make sense during recovery stage
3693 //as we don't know what actual parameter types are
3694 result = that.type = currentTarget;
3695 return;
3696 } else {
3697 if (targetError) {
3698 resultInfo.checkContext.report(that, diag);
3699 } else {
3700 log.report(diag);
3701 }
3702 result = that.type = types.createErrorType(currentTarget);
3703 return;
3704 }
3705 }
3706
3707 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3708 that.kind = lookupHelper.referenceKind(that.sym);
3709 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3710
3711 if (desc.getReturnType() == Type.recoveryType) {
3712 // stop here
3713 result = that.type = currentTarget;
3714 return;
3715 }
3716
3717 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3718 checkNewInnerClass(that.pos(), env, exprType, false);
3719 }
3720
3721 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3722
3723 if (that.getMode() == ReferenceMode.INVOKE &&
3724 TreeInfo.isStaticSelector(that.expr, names) &&
3725 that.kind.isUnbound() &&
3726 lookupHelper.site.isRaw()) {
3727 chk.checkRaw(that.expr, localEnv);
3728 }
3729
3730 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3731 exprType.getTypeArguments().nonEmpty()) {
3732 //static ref with class type-args
3733 log.error(that.expr.pos(),
3734 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3735 Fragments.StaticMrefWithTargs));
3736 result = that.type = types.createErrorType(currentTarget);
3737 return;
3738 }
3739
3740 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3741 // Check that super-qualified symbols are not abstract (JLS)
3742 rs.checkNonAbstract(that.pos(), that.sym);
3743 }
3744
3745 if (isTargetSerializable) {
3746 chk.checkAccessFromSerializableElement(that, true);
3747 }
3748 }
3749
3750 ResultInfo checkInfo =
3751 resultInfo.dup(newMethodTemplate(
3752 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3753 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3754 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3755
3756 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3757
3758 if (that.kind.isUnbound() &&
3759 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3760 //re-generate inference constraints for unbound receiver
3761 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3762 //cannot happen as this has already been checked - we just need
3763 //to regenerate the inference constraints, as that has been lost
3764 //as a result of the call to inferenceContext.save()
3765 Assert.error("Can't get here");
3766 }
3767 }
3768
3769 if (!refType.isErroneous()) {
3770 refType = types.createMethodTypeWithReturn(refType,
3771 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3772 }
3773
3774 //go ahead with standard method reference compatibility check - note that param check
3775 //is a no-op (as this has been taken care during method applicability)
3776 boolean isSpeculativeRound =
3777 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3778
3779 that.type = currentTarget; //avoids recovery at this stage
3780 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3781 if (!isSpeculativeRound) {
3782 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3783 }
3784 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3785 } catch (Types.FunctionDescriptorLookupError ex) {
3786 JCDiagnostic cause = ex.getDiagnostic();
3787 resultInfo.checkContext.report(that, cause);
3788 result = that.type = types.createErrorType(pt());
3789 return;
3790 }
3791 }
3792 //where
3793 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3794 //if this is a constructor reference, the expected kind must be a type
3795 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3796 KindSelector.VAL_TYP : KindSelector.TYP,
3797 Type.noType);
3798 }
3799
3800
3801 @SuppressWarnings("fallthrough")
3802 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3803 InferenceContext inferenceContext = checkContext.inferenceContext();
3804 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3805
3806 Type resType;
3807 switch (tree.getMode()) {
3808 case NEW:
3809 if (!tree.expr.type.isRaw()) {
3810 resType = tree.expr.type;
3811 break;
3812 }
3813 default:
3814 resType = refType.getReturnType();
3815 }
3816
3817 Type incompatibleReturnType = resType;
3818
3819 if (returnType.hasTag(VOID)) {
3820 incompatibleReturnType = null;
3821 }
3822
3823 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3824 if (resType.isErroneous() ||
3825 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3826 checkContext.checkWarner(tree, resType, returnType))) {
3827 incompatibleReturnType = null;
3828 }
3829 }
3830
3831 if (incompatibleReturnType != null) {
3832 Fragment msg =
3833 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3834 checkContext.report(tree, diags.fragment(msg));
3835 } else {
3836 if (inferenceContext.free(refType)) {
3837 // we need to wait for inference to finish and then replace inference vars in the referent type
3838 inferenceContext.addFreeTypeListener(List.of(refType),
3839 instantiatedContext -> {
3840 tree.referentType = instantiatedContext.asInstType(refType);
3841 });
3842 } else {
3843 tree.referentType = refType;
3844 }
3845 }
3846
3847 if (!speculativeAttr) {
3848 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3849 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3850 }
3851 }
3852 }
3853
3854 boolean checkExConstraints(
3855 List<Type> thrownByFuncExpr,
3856 List<Type> thrownAtFuncType,
3857 InferenceContext inferenceContext) {
3858 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3859 * are not proper types
3860 */
3861 List<Type> nonProperList = thrownAtFuncType.stream()
3862 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3863 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3864
3865 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3866 * in the throws clause of the invocation type of the method reference's compile-time
3867 * declaration
3868 */
3869 List<Type> checkedList = thrownByFuncExpr.stream()
3870 .filter(e -> chk.isChecked(e)).collect(List.collector());
3871
3872 /** If n = 0 (the function type's throws clause consists only of proper types), then
3873 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3874 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3875 * reduces to true
3876 */
3877 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3878 for (Type checked : checkedList) {
3879 boolean isSubtype = false;
3880 for (Type proper : properList) {
3881 if (types.isSubtype(checked, proper)) {
3882 isSubtype = true;
3883 break;
3884 }
3885 }
3886 if (!isSubtype) {
3887 uncaughtByProperTypes.add(checked);
3888 }
3889 }
3890
3891 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3892 return false;
3893 }
3894
3895 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3896 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3897 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3898 */
3899 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3900 uncaughtByProperTypes.forEach(checkedEx -> {
3901 nonProperAsUndet.forEach(nonProper -> {
3902 types.isSubtype(checkedEx, nonProper);
3903 });
3904 });
3905
3906 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3907 */
3908 nonProperAsUndet.stream()
3909 .filter(t -> t.hasTag(UNDETVAR))
3910 .forEach(t -> ((UndetVar)t).setThrow());
3911 return true;
3912 }
3913
3914 /**
3915 * Set functional type info on the underlying AST. Note: as the target descriptor
3916 * might contain inference variables, we might need to register an hook in the
3917 * current inference context.
3918 */
3919 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3920 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3921 if (checkContext.inferenceContext().free(descriptorType)) {
3922 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3923 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3924 inferenceContext.asInstType(primaryTarget), checkContext));
3925 } else {
3926 fExpr.owner = env.info.scope.owner;
3927 if (pt.hasTag(CLASS)) {
3928 fExpr.target = primaryTarget;
3929 }
3930 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3931 pt != Type.recoveryType) {
3932 //check that functional interface class is well-formed
3933 try {
3934 /* Types.makeFunctionalInterfaceClass() may throw an exception
3935 * when it's executed post-inference. See the listener code
3936 * above.
3937 */
3938 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3939 names.empty, fExpr.target, ABSTRACT);
3940 if (csym != null) {
3941 chk.checkImplementations(env.tree, csym, csym);
3942 try {
3943 //perform an additional functional interface check on the synthetic class,
3944 //as there may be spurious errors for raw targets - because of existing issues
3945 //with membership and inheritance (see JDK-8074570).
3946 csym.flags_field |= INTERFACE;
3947 types.findDescriptorType(csym.type);
3948 } catch (FunctionDescriptorLookupError err) {
3949 resultInfo.checkContext.report(fExpr,
3950 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3951 }
3952 }
3953 } catch (Types.FunctionDescriptorLookupError ex) {
3954 JCDiagnostic cause = ex.getDiagnostic();
3955 resultInfo.checkContext.report(env.tree, cause);
3956 }
3957 }
3958 }
3959 }
3960
3961 public void visitParens(JCParens tree) {
3962 Type owntype = attribTree(tree.expr, env, resultInfo);
3963 result = check(tree, owntype, pkind(), resultInfo);
3964 Symbol sym = TreeInfo.symbol(tree);
3965 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3966 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3967 }
3968
3969 public void visitAssign(JCAssign tree) {
3970 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3971 Type capturedType = capture(owntype);
3972 attribExpr(tree.rhs, env, owntype);
3973 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3974 }
3975
3976 public void visitAssignop(JCAssignOp tree) {
3977 // Attribute arguments.
3978 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3979 Type operand = attribExpr(tree.rhs, env);
3980 // Find operator.
3981 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3982 if (operator != operators.noOpSymbol &&
3983 !owntype.isErroneous() &&
3984 !operand.isErroneous()) {
3985 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3986 chk.checkCastable(tree.rhs.pos(),
3987 operator.type.getReturnType(),
3988 owntype);
3989 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
3990 }
3991 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3992 }
3993
3994 public void visitUnary(JCUnary tree) {
3995 // Attribute arguments.
3996 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3997 ? attribTree(tree.arg, env, varAssignmentInfo)
3998 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3999
4000 // Find operator.
4001 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4002 Type owntype = types.createErrorType(tree.type);
4003 if (operator != operators.noOpSymbol &&
4004 !argtype.isErroneous()) {
4005 owntype = (tree.getTag().isIncOrDecUnaryOp())
4006 ? tree.arg.type
4007 : operator.type.getReturnType();
4008 int opc = operator.opcode;
4009
4010 // If the argument is constant, fold it.
4011 if (argtype.constValue() != null) {
4012 Type ctype = cfolder.fold1(opc, argtype);
4013 if (ctype != null) {
4014 owntype = cfolder.coerce(ctype, owntype);
4015 }
4016 }
4017 }
4018 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4019 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4020 }
4021
4022 public void visitBinary(JCBinary tree) {
4023 // Attribute arguments.
4024 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4025 // x && y
4026 // include x's bindings when true in y
4027
4028 // x || y
4029 // include x's bindings when false in y
4030
4031 MatchBindings lhsBindings = matchBindings;
4032 List<BindingSymbol> propagatedBindings;
4033 switch (tree.getTag()) {
4034 case AND:
4035 propagatedBindings = lhsBindings.bindingsWhenTrue;
4036 break;
4037 case OR:
4038 propagatedBindings = lhsBindings.bindingsWhenFalse;
4039 break;
4040 default:
4041 propagatedBindings = List.nil();
4042 break;
4043 }
4044 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4045 Type right;
4046 try {
4047 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4048 } finally {
4049 rhsEnv.info.scope.leave();
4050 }
4051
4052 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4053
4054 // Find operator.
4055 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4056 Type owntype = types.createErrorType(tree.type);
4057 if (operator != operators.noOpSymbol &&
4058 !left.isErroneous() &&
4059 !right.isErroneous()) {
4060 owntype = operator.type.getReturnType();
4061 int opc = operator.opcode;
4062 // If both arguments are constants, fold them.
4063 if (left.constValue() != null && right.constValue() != null) {
4064 Type ctype = cfolder.fold2(opc, left, right);
4065 if (ctype != null) {
4066 owntype = cfolder.coerce(ctype, owntype);
4067 }
4068 }
4069
4070 // Check that argument types of a reference ==, != are
4071 // castable to each other, (JLS 15.21). Note: unboxing
4072 // comparisons will not have an acmp* opc at this point.
4073 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4074 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4075 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4076 }
4077 }
4078
4079 chk.checkDivZero(tree.rhs.pos(), operator, right);
4080 }
4081 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4082 }
4083
4084 public void visitTypeCast(final JCTypeCast tree) {
4085 Type clazztype = attribType(tree.clazz, env);
4086 chk.validate(tree.clazz, env, false);
4087 //a fresh environment is required for 292 inference to work properly ---
4088 //see Infer.instantiatePolymorphicSignatureInstance()
4089 Env<AttrContext> localEnv = env.dup(tree);
4090 //should we propagate the target type?
4091 final ResultInfo castInfo;
4092 JCExpression expr = TreeInfo.skipParens(tree.expr);
4093 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4094 if (isPoly) {
4095 //expression is a poly - we need to propagate target type info
4096 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4097 new Check.NestedCheckContext(resultInfo.checkContext) {
4098 @Override
4099 public boolean compatible(Type found, Type req, Warner warn) {
4100 return types.isCastable(found, req, warn);
4101 }
4102 });
4103 } else {
4104 //standalone cast - target-type info is not propagated
4105 castInfo = unknownExprInfo;
4106 }
4107 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4108 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4109 if (exprtype.constValue() != null)
4110 owntype = cfolder.coerce(exprtype, owntype);
4111 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4112 if (!isPoly)
4113 chk.checkRedundantCast(localEnv, tree);
4114 }
4115
4116 public void visitTypeTest(JCInstanceOf tree) {
4117 Type exprtype = attribExpr(tree.expr, env);
4118 if (exprtype.isPrimitive()) {
4119 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4120 } else {
4121 exprtype = chk.checkNullOrRefType(
4122 tree.expr.pos(), exprtype);
4123 }
4124 Type clazztype;
4125 JCTree typeTree;
4126 if (tree.pattern.getTag() == BINDINGPATTERN ||
4127 tree.pattern.getTag() == RECORDPATTERN) {
4128 attribExpr(tree.pattern, env, exprtype);
4129 clazztype = tree.pattern.type;
4130 if (types.isSubtype(exprtype, clazztype) &&
4131 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4132 tree.pattern.getTag() != RECORDPATTERN) {
4133 if (!allowUnconditionalPatternsInstanceOf) {
4134 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4135 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4136 }
4137 }
4138 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4139 } else {
4140 clazztype = attribType(tree.pattern, env);
4141 typeTree = tree.pattern;
4142 chk.validate(typeTree, env, false);
4143 }
4144 if (clazztype.isPrimitive()) {
4145 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4146 } else {
4147 if (!clazztype.hasTag(TYPEVAR)) {
4148 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4149 }
4150 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4151 boolean valid = false;
4152 if (allowReifiableTypesInInstanceof) {
4153 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4154 } else {
4155 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4156 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4157 allowReifiableTypesInInstanceof = true;
4158 }
4159 if (!valid) {
4160 clazztype = types.createErrorType(clazztype);
4161 }
4162 }
4163 }
4164 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4165 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4166 }
4167
4168 private boolean checkCastablePattern(DiagnosticPosition pos,
4169 Type exprType,
4170 Type pattType) {
4171 Warner warner = new Warner();
4172 // if any type is erroneous, the problem is reported elsewhere
4173 if (exprType.isErroneous() || pattType.isErroneous()) {
4174 return false;
4175 }
4176 if (!types.isCastable(exprType, pattType, warner)) {
4177 chk.basicHandler.report(pos,
4178 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4179 return false;
4180 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4181 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4182 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4183 return true;
4184 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4185 log.error(pos,
4186 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4187 return false;
4188 } else {
4189 return true;
4190 }
4191 }
4192
4193 @Override
4194 public void visitAnyPattern(JCAnyPattern tree) {
4195 result = tree.type = resultInfo.pt;
4196 }
4197
4198 public void visitBindingPattern(JCBindingPattern tree) {
4199 Type type;
4200 if (tree.var.vartype != null) {
4201 type = attribType(tree.var.vartype, env);
4202 } else {
4203 type = resultInfo.pt;
4204 }
4205 tree.type = tree.var.type = type;
4206 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4207 v.pos = tree.pos;
4208 tree.var.sym = v;
4209 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4210 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4211 }
4212 chk.validate(tree.var.vartype, env, true);
4213 if (tree.var.isImplicitlyTyped()) {
4214 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4215 : type);
4216 }
4217 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.var);
4218 if (!tree.var.isImplicitlyTyped()) {
4219 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var);
4220 }
4221 annotate.flush();
4222 result = tree.type;
4223 if (v.isUnnamedVariable()) {
4224 matchBindings = MatchBindingsComputer.EMPTY;
4225 } else {
4226 matchBindings = new MatchBindings(List.of(v), List.nil());
4227 }
4228 }
4229
4230 @Override
4231 public void visitRecordPattern(JCRecordPattern tree) {
4232 Type site;
4233
4234 if (tree.deconstructor == null) {
4235 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4236 tree.record = syms.errSymbol;
4237 site = tree.type = types.createErrorType(tree.record.type);
4238 } else {
4239 Type type = attribType(tree.deconstructor, env);
4240 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4241 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4242 if (inferred == null) {
4243 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4244 } else {
4245 type = inferred;
4246 }
4247 }
4248 tree.type = tree.deconstructor.type = type;
4249 site = types.capture(tree.type);
4250 }
4251
4252 List<Type> expectedRecordTypes;
4253 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4254 ClassSymbol record = (ClassSymbol) site.tsym;
4255 expectedRecordTypes = record.getRecordComponents()
4256 .stream()
4257 .map(rc -> types.memberType(site, rc))
4258 .map(t -> types.upward(t, types.captures(t)).baseType())
4259 .collect(List.collector());
4260 tree.record = record;
4261 } else {
4262 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4263 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4264 .limit(tree.nested.size())
4265 .collect(List.collector());
4266 tree.record = syms.errSymbol;
4267 }
4268 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4269 List<Type> recordTypes = expectedRecordTypes;
4270 List<JCPattern> nestedPatterns = tree.nested;
4271 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4272 try {
4273 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4274 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4275 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4276 outBindings.addAll(matchBindings.bindingsWhenTrue);
4277 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4278 nestedPatterns = nestedPatterns.tail;
4279 recordTypes = recordTypes.tail;
4280 }
4281 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4282 while (nestedPatterns.nonEmpty()) {
4283 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4284 nestedPatterns = nestedPatterns.tail;
4285 }
4286 List<Type> nestedTypes =
4287 tree.nested.stream().map(p -> p.type).collect(List.collector());
4288 log.error(tree.pos(),
4289 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4290 nestedTypes));
4291 }
4292 } finally {
4293 localEnv.info.scope.leave();
4294 }
4295 chk.validate(tree.deconstructor, env, true);
4296 result = tree.type;
4297 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4298 }
4299
4300 public void visitIndexed(JCArrayAccess tree) {
4301 Type owntype = types.createErrorType(tree.type);
4302 Type atype = attribExpr(tree.indexed, env);
4303 attribExpr(tree.index, env, syms.intType);
4304 if (types.isArray(atype))
4305 owntype = types.elemtype(atype);
4306 else if (!atype.hasTag(ERROR))
4307 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4308 if (!pkind().contains(KindSelector.VAL))
4309 owntype = capture(owntype);
4310 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4311 }
4312
4313 public void visitIdent(JCIdent tree) {
4314 Symbol sym;
4315
4316 // Find symbol
4317 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4318 // If we are looking for a method, the prototype `pt' will be a
4319 // method type with the type of the call's arguments as parameters.
4320 env.info.pendingResolutionPhase = null;
4321 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4322 } else if (tree.sym != null && tree.sym.kind != VAR) {
4323 sym = tree.sym;
4324 } else {
4325 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4326 }
4327 tree.sym = sym;
4328
4329 // Also find the environment current for the class where
4330 // sym is defined (`symEnv').
4331 Env<AttrContext> symEnv = env;
4332 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4333 sym.kind.matches(KindSelector.VAL_MTH) &&
4334 sym.owner.kind == TYP &&
4335 tree.name != names._this && tree.name != names._super) {
4336
4337 // Find environment in which identifier is defined.
4338 while (symEnv.outer != null &&
4339 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4340 symEnv = symEnv.outer;
4341 }
4342 }
4343
4344 // If symbol is a variable, ...
4345 if (sym.kind == VAR) {
4346 VarSymbol v = (VarSymbol)sym;
4347
4348 // ..., evaluate its initializer, if it has one, and check for
4349 // illegal forward reference.
4350 checkInit(tree, env, v, false);
4351
4352 // If we are expecting a variable (as opposed to a value), check
4353 // that the variable is assignable in the current environment.
4354 if (KindSelector.ASG.subset(pkind()))
4355 checkAssignable(tree.pos(), v, null, env);
4356 }
4357
4358 Env<AttrContext> env1 = env;
4359 if (sym.kind != ERR && sym.kind != TYP &&
4360 sym.owner != null && sym.owner != env1.enclClass.sym) {
4361 // If the found symbol is inaccessible, then it is
4362 // accessed through an enclosing instance. Locate this
4363 // enclosing instance:
4364 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4365 env1 = env1.outer;
4366 }
4367
4368 if (env.info.isSerializable) {
4369 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4370 }
4371
4372 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4373 }
4374
4375 public void visitSelect(JCFieldAccess tree) {
4376 // Determine the expected kind of the qualifier expression.
4377 KindSelector skind = KindSelector.NIL;
4378 if (tree.name == names._this || tree.name == names._super ||
4379 tree.name == names._class)
4380 {
4381 skind = KindSelector.TYP;
4382 } else {
4383 if (pkind().contains(KindSelector.PCK))
4384 skind = KindSelector.of(skind, KindSelector.PCK);
4385 if (pkind().contains(KindSelector.TYP))
4386 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4387 if (pkind().contains(KindSelector.VAL_MTH))
4388 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4389 }
4390
4391 // Attribute the qualifier expression, and determine its symbol (if any).
4392 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4393 if (!pkind().contains(KindSelector.TYP_PCK))
4394 site = capture(site); // Capture field access
4395
4396 // don't allow T.class T[].class, etc
4397 if (skind == KindSelector.TYP) {
4398 Type elt = site;
4399 while (elt.hasTag(ARRAY))
4400 elt = ((ArrayType)elt).elemtype;
4401 if (elt.hasTag(TYPEVAR)) {
4402 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4403 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4404 tree.sym = tree.type.tsym;
4405 return ;
4406 }
4407 }
4408
4409 // If qualifier symbol is a type or `super', assert `selectSuper'
4410 // for the selection. This is relevant for determining whether
4411 // protected symbols are accessible.
4412 Symbol sitesym = TreeInfo.symbol(tree.selected);
4413 boolean selectSuperPrev = env.info.selectSuper;
4414 env.info.selectSuper =
4415 sitesym != null &&
4416 sitesym.name == names._super;
4417
4418 // Determine the symbol represented by the selection.
4419 env.info.pendingResolutionPhase = null;
4420 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4421 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4422 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4423 sym = syms.errSymbol;
4424 }
4425 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4426 site = capture(site);
4427 sym = selectSym(tree, sitesym, site, env, resultInfo);
4428 }
4429 boolean varArgs = env.info.lastResolveVarargs();
4430 tree.sym = sym;
4431
4432 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4433 site = types.skipTypeVars(site, true);
4434 }
4435
4436 // If that symbol is a variable, ...
4437 if (sym.kind == VAR) {
4438 VarSymbol v = (VarSymbol)sym;
4439
4440 // ..., evaluate its initializer, if it has one, and check for
4441 // illegal forward reference.
4442 checkInit(tree, env, v, true);
4443
4444 // If we are expecting a variable (as opposed to a value), check
4445 // that the variable is assignable in the current environment.
4446 if (KindSelector.ASG.subset(pkind()))
4447 checkAssignable(tree.pos(), v, tree.selected, env);
4448 }
4449
4450 if (sitesym != null &&
4451 sitesym.kind == VAR &&
4452 ((VarSymbol)sitesym).isResourceVariable() &&
4453 sym.kind == MTH &&
4454 sym.name.equals(names.close) &&
4455 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4456 env.info.lint.logIfEnabled(tree, LintWarnings.TryExplicitCloseCall);
4457 }
4458
4459 // Disallow selecting a type from an expression
4460 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4461 tree.type = check(tree.selected, pt(),
4462 sitesym == null ?
4463 KindSelector.VAL : sitesym.kind.toSelector(),
4464 new ResultInfo(KindSelector.TYP_PCK, pt()));
4465 }
4466
4467 if (isType(sitesym)) {
4468 if (sym.name != names._this && sym.name != names._super) {
4469 // Check if type-qualified fields or methods are static (JLS)
4470 if ((sym.flags() & STATIC) == 0 &&
4471 sym.name != names._super &&
4472 (sym.kind == VAR || sym.kind == MTH)) {
4473 rs.accessBase(rs.new StaticError(sym),
4474 tree.pos(), site, sym.name, true);
4475 }
4476 }
4477 } else if (sym.kind != ERR &&
4478 (sym.flags() & STATIC) != 0 &&
4479 sym.name != names._class) {
4480 // If the qualified item is not a type and the selected item is static, report
4481 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4482 if (!sym.owner.isAnonymous()) {
4483 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4484 } else {
4485 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4486 }
4487 }
4488
4489 // If we are selecting an instance member via a `super', ...
4490 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4491
4492 // Check that super-qualified symbols are not abstract (JLS)
4493 rs.checkNonAbstract(tree.pos(), sym);
4494
4495 if (site.isRaw()) {
4496 // Determine argument types for site.
4497 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4498 if (site1 != null) site = site1;
4499 }
4500 }
4501
4502 if (env.info.isSerializable) {
4503 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4504 }
4505
4506 env.info.selectSuper = selectSuperPrev;
4507 result = checkId(tree, site, sym, env, resultInfo);
4508 }
4509 //where
4510 /** Determine symbol referenced by a Select expression,
4511 *
4512 * @param tree The select tree.
4513 * @param site The type of the selected expression,
4514 * @param env The current environment.
4515 * @param resultInfo The current result.
4516 */
4517 private Symbol selectSym(JCFieldAccess tree,
4518 Symbol location,
4519 Type site,
4520 Env<AttrContext> env,
4521 ResultInfo resultInfo) {
4522 DiagnosticPosition pos = tree.pos();
4523 Name name = tree.name;
4524 switch (site.getTag()) {
4525 case PACKAGE:
4526 return rs.accessBase(
4527 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4528 pos, location, site, name, true);
4529 case ARRAY:
4530 case CLASS:
4531 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4532 return rs.resolveQualifiedMethod(
4533 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4534 } else if (name == names._this || name == names._super) {
4535 return rs.resolveSelf(pos, env, site.tsym, name);
4536 } else if (name == names._class) {
4537 // In this case, we have already made sure in
4538 // visitSelect that qualifier expression is a type.
4539 return syms.getClassField(site, types);
4540 } else {
4541 // We are seeing a plain identifier as selector.
4542 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4543 sym = rs.accessBase(sym, pos, location, site, name, true);
4544 return sym;
4545 }
4546 case WILDCARD:
4547 throw new AssertionError(tree);
4548 case TYPEVAR:
4549 // Normally, site.getUpperBound() shouldn't be null.
4550 // It should only happen during memberEnter/attribBase
4551 // when determining the supertype which *must* be
4552 // done before attributing the type variables. In
4553 // other words, we are seeing this illegal program:
4554 // class B<T> extends A<T.foo> {}
4555 Symbol sym = (site.getUpperBound() != null)
4556 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4557 : null;
4558 if (sym == null) {
4559 log.error(pos, Errors.TypeVarCantBeDeref);
4560 return syms.errSymbol;
4561 } else {
4562 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4563 rs.new AccessError(env, site, sym) :
4564 sym;
4565 rs.accessBase(sym2, pos, location, site, name, true);
4566 return sym;
4567 }
4568 case ERROR:
4569 // preserve identifier names through errors
4570 return types.createErrorType(name, site.tsym, site).tsym;
4571 default:
4572 // The qualifier expression is of a primitive type -- only
4573 // .class is allowed for these.
4574 if (name == names._class) {
4575 // In this case, we have already made sure in Select that
4576 // qualifier expression is a type.
4577 return syms.getClassField(site, types);
4578 } else {
4579 log.error(pos, Errors.CantDeref(site));
4580 return syms.errSymbol;
4581 }
4582 }
4583 }
4584
4585 /** Determine type of identifier or select expression and check that
4586 * (1) the referenced symbol is not deprecated
4587 * (2) the symbol's type is safe (@see checkSafe)
4588 * (3) if symbol is a variable, check that its type and kind are
4589 * compatible with the prototype and protokind.
4590 * (4) if symbol is an instance field of a raw type,
4591 * which is being assigned to, issue an unchecked warning if its
4592 * type changes under erasure.
4593 * (5) if symbol is an instance method of a raw type, issue an
4594 * unchecked warning if its argument types change under erasure.
4595 * If checks succeed:
4596 * If symbol is a constant, return its constant type
4597 * else if symbol is a method, return its result type
4598 * otherwise return its type.
4599 * Otherwise return errType.
4600 *
4601 * @param tree The syntax tree representing the identifier
4602 * @param site If this is a select, the type of the selected
4603 * expression, otherwise the type of the current class.
4604 * @param sym The symbol representing the identifier.
4605 * @param env The current environment.
4606 * @param resultInfo The expected result
4607 */
4608 Type checkId(JCTree tree,
4609 Type site,
4610 Symbol sym,
4611 Env<AttrContext> env,
4612 ResultInfo resultInfo) {
4613 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4614 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4615 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4616 }
4617
4618 Type checkMethodIdInternal(JCTree tree,
4619 Type site,
4620 Symbol sym,
4621 Env<AttrContext> env,
4622 ResultInfo resultInfo) {
4623 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4624 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4625 } else {
4626 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4627 }
4628 }
4629
4630 Type checkIdInternal(JCTree tree,
4631 Type site,
4632 Symbol sym,
4633 Type pt,
4634 Env<AttrContext> env,
4635 ResultInfo resultInfo) {
4636 Type owntype; // The computed type of this identifier occurrence.
4637 switch (sym.kind) {
4638 case TYP:
4639 // For types, the computed type equals the symbol's type,
4640 // except for two situations:
4641 owntype = sym.type;
4642 if (owntype.hasTag(CLASS)) {
4643 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4644 Type ownOuter = owntype.getEnclosingType();
4645
4646 // (a) If the symbol's type is parameterized, erase it
4647 // because no type parameters were given.
4648 // We recover generic outer type later in visitTypeApply.
4649 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4650 owntype = types.erasure(owntype);
4651 }
4652
4653 // (b) If the symbol's type is an inner class, then
4654 // we have to interpret its outer type as a superclass
4655 // of the site type. Example:
4656 //
4657 // class Tree<A> { class Visitor { ... } }
4658 // class PointTree extends Tree<Point> { ... }
4659 // ...PointTree.Visitor...
4660 //
4661 // Then the type of the last expression above is
4662 // Tree<Point>.Visitor.
4663 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4664 Type normOuter = site;
4665 if (normOuter.hasTag(CLASS)) {
4666 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4667 }
4668 if (normOuter == null) // perhaps from an import
4669 normOuter = types.erasure(ownOuter);
4670 if (normOuter != ownOuter)
4671 owntype = new ClassType(
4672 normOuter, List.nil(), owntype.tsym,
4673 owntype.getMetadata());
4674 }
4675 }
4676 break;
4677 case VAR:
4678 VarSymbol v = (VarSymbol)sym;
4679
4680 if (env.info.enclVar != null
4681 && v.type.hasTag(NONE)) {
4682 //self reference to implicitly typed variable declaration
4683 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4684 return tree.type = v.type = types.createErrorType(v.type);
4685 }
4686
4687 // Test (4): if symbol is an instance field of a raw type,
4688 // which is being assigned to, issue an unchecked warning if
4689 // its type changes under erasure.
4690 if (KindSelector.ASG.subset(pkind()) &&
4691 v.owner.kind == TYP &&
4692 (v.flags() & STATIC) == 0 &&
4693 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4694 Type s = types.asOuterSuper(site, v.owner);
4695 if (s != null &&
4696 s.isRaw() &&
4697 !types.isSameType(v.type, v.erasure(types))) {
4698 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4699 }
4700 }
4701 // The computed type of a variable is the type of the
4702 // variable symbol, taken as a member of the site type.
4703 owntype = (sym.owner.kind == TYP &&
4704 sym.name != names._this && sym.name != names._super)
4705 ? types.memberType(site, sym)
4706 : sym.type;
4707
4708 // If the variable is a constant, record constant value in
4709 // computed type.
4710 if (v.getConstValue() != null && isStaticReference(tree))
4711 owntype = owntype.constType(v.getConstValue());
4712
4713 if (resultInfo.pkind == KindSelector.VAL) {
4714 owntype = capture(owntype); // capture "names as expressions"
4715 }
4716 break;
4717 case MTH: {
4718 owntype = checkMethod(site, sym,
4719 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4720 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4721 resultInfo.pt.getTypeArguments());
4722 chk.checkRestricted(tree.pos(), sym);
4723 break;
4724 }
4725 case PCK: case ERR:
4726 owntype = sym.type;
4727 break;
4728 default:
4729 throw new AssertionError("unexpected kind: " + sym.kind +
4730 " in tree " + tree);
4731 }
4732
4733 // Emit a `deprecation' warning if symbol is deprecated.
4734 // (for constructors (but not for constructor references), the error
4735 // was given when the constructor was resolved)
4736
4737 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4738 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4739 chk.checkSunAPI(tree.pos(), sym);
4740 chk.checkProfile(tree.pos(), sym);
4741 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4742 }
4743
4744 if (pt.isErroneous()) {
4745 owntype = types.createErrorType(owntype);
4746 }
4747
4748 // If symbol is a variable, check that its type and
4749 // kind are compatible with the prototype and protokind.
4750 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4751 }
4752
4753 /** Check that variable is initialized and evaluate the variable's
4754 * initializer, if not yet done. Also check that variable is not
4755 * referenced before it is defined.
4756 * @param tree The tree making up the variable reference.
4757 * @param env The current environment.
4758 * @param v The variable's symbol.
4759 */
4760 private void checkInit(JCTree tree,
4761 Env<AttrContext> env,
4762 VarSymbol v,
4763 boolean onlyWarning) {
4764 // A forward reference is diagnosed if the declaration position
4765 // of the variable is greater than the current tree position
4766 // and the tree and variable definition occur in the same class
4767 // definition. Note that writes don't count as references.
4768 // This check applies only to class and instance
4769 // variables. Local variables follow different scope rules,
4770 // and are subject to definite assignment checking.
4771 Env<AttrContext> initEnv = enclosingInitEnv(env);
4772 if (initEnv != null &&
4773 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4774 v.owner.kind == TYP &&
4775 v.owner == env.info.scope.owner.enclClass() &&
4776 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4777 (!env.tree.hasTag(ASSIGN) ||
4778 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4779 if (!onlyWarning || isStaticEnumField(v)) {
4780 Error errkey = (initEnv.info.enclVar == v) ?
4781 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4782 log.error(tree.pos(), errkey);
4783 } else if (useBeforeDeclarationWarning) {
4784 Warning warnkey = (initEnv.info.enclVar == v) ?
4785 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4786 log.warning(tree.pos(), warnkey);
4787 }
4788 }
4789
4790 v.getConstValue(); // ensure initializer is evaluated
4791
4792 checkEnumInitializer(tree, env, v);
4793 }
4794
4795 /**
4796 * Returns the enclosing init environment associated with this env (if any). An init env
4797 * can be either a field declaration env or a static/instance initializer env.
4798 */
4799 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4800 while (true) {
4801 switch (env.tree.getTag()) {
4802 case VARDEF:
4803 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4804 if (vdecl.sym.owner.kind == TYP) {
4805 //field
4806 return env;
4807 }
4808 break;
4809 case BLOCK:
4810 if (env.next.tree.hasTag(CLASSDEF)) {
4811 //instance/static initializer
4812 return env;
4813 }
4814 break;
4815 case METHODDEF:
4816 case CLASSDEF:
4817 case TOPLEVEL:
4818 return null;
4819 }
4820 Assert.checkNonNull(env.next);
4821 env = env.next;
4822 }
4823 }
4824
4825 /**
4826 * Check for illegal references to static members of enum. In
4827 * an enum type, constructors and initializers may not
4828 * reference its static members unless they are constant.
4829 *
4830 * @param tree The tree making up the variable reference.
4831 * @param env The current environment.
4832 * @param v The variable's symbol.
4833 * @jls 8.9 Enum Types
4834 */
4835 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4836 // JLS:
4837 //
4838 // "It is a compile-time error to reference a static field
4839 // of an enum type that is not a compile-time constant
4840 // (15.28) from constructors, instance initializer blocks,
4841 // or instance variable initializer expressions of that
4842 // type. It is a compile-time error for the constructors,
4843 // instance initializer blocks, or instance variable
4844 // initializer expressions of an enum constant e to refer
4845 // to itself or to an enum constant of the same type that
4846 // is declared to the right of e."
4847 if (isStaticEnumField(v)) {
4848 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4849
4850 if (enclClass == null || enclClass.owner == null)
4851 return;
4852
4853 // See if the enclosing class is the enum (or a
4854 // subclass thereof) declaring v. If not, this
4855 // reference is OK.
4856 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4857 return;
4858
4859 // If the reference isn't from an initializer, then
4860 // the reference is OK.
4861 if (!Resolve.isInitializer(env))
4862 return;
4863
4864 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4865 }
4866 }
4867
4868 /** Is the given symbol a static, non-constant field of an Enum?
4869 * Note: enum literals should not be regarded as such
4870 */
4871 private boolean isStaticEnumField(VarSymbol v) {
4872 return Flags.isEnum(v.owner) &&
4873 Flags.isStatic(v) &&
4874 !Flags.isConstant(v) &&
4875 v.name != names._class;
4876 }
4877
4878 /**
4879 * Check that method arguments conform to its instantiation.
4880 **/
4881 public Type checkMethod(Type site,
4882 final Symbol sym,
4883 ResultInfo resultInfo,
4884 Env<AttrContext> env,
4885 final List<JCExpression> argtrees,
4886 List<Type> argtypes,
4887 List<Type> typeargtypes) {
4888 // Test (5): if symbol is an instance method of a raw type, issue
4889 // an unchecked warning if its argument types change under erasure.
4890 if ((sym.flags() & STATIC) == 0 &&
4891 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4892 Type s = types.asOuterSuper(site, sym.owner);
4893 if (s != null && s.isRaw() &&
4894 !types.isSameTypes(sym.type.getParameterTypes(),
4895 sym.erasure(types).getParameterTypes())) {
4896 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
4897 }
4898 }
4899
4900 if (env.info.defaultSuperCallSite != null) {
4901 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4902 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4903 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4904 List<MethodSymbol> icand_sup =
4905 types.interfaceCandidates(sup, (MethodSymbol)sym);
4906 if (icand_sup.nonEmpty() &&
4907 icand_sup.head != sym &&
4908 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4909 log.error(env.tree.pos(),
4910 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4911 break;
4912 }
4913 }
4914 env.info.defaultSuperCallSite = null;
4915 }
4916
4917 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4918 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4919 if (app.meth.hasTag(SELECT) &&
4920 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4921 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4922 }
4923 }
4924
4925 // Compute the identifier's instantiated type.
4926 // For methods, we need to compute the instance type by
4927 // Resolve.instantiate from the symbol's type as well as
4928 // any type arguments and value arguments.
4929 Warner noteWarner = new Warner();
4930 try {
4931 Type owntype = rs.checkMethod(
4932 env,
4933 site,
4934 sym,
4935 resultInfo,
4936 argtypes,
4937 typeargtypes,
4938 noteWarner);
4939
4940 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4941 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4942
4943 argtypes = argtypes.map(checkDeferredMap);
4944
4945 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4946 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
4947 sym.name,
4948 rs.methodArguments(sym.type.getParameterTypes()),
4949 rs.methodArguments(argtypes.map(checkDeferredMap)),
4950 kindName(sym.location()),
4951 sym.location()));
4952 if (resultInfo.pt != Infer.anyPoly ||
4953 !owntype.hasTag(METHOD) ||
4954 !owntype.isPartial()) {
4955 //if this is not a partially inferred method type, erase return type. Otherwise,
4956 //erasure is carried out in PartiallyInferredMethodType.check().
4957 owntype = new MethodType(owntype.getParameterTypes(),
4958 types.erasure(owntype.getReturnType()),
4959 types.erasure(owntype.getThrownTypes()),
4960 syms.methodClass);
4961 }
4962 }
4963
4964 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4965 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4966 PolyKind.POLY : PolyKind.STANDALONE;
4967 TreeInfo.setPolyKind(env.tree, pkind);
4968
4969 return (resultInfo.pt == Infer.anyPoly) ?
4970 owntype :
4971 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4972 resultInfo.checkContext.inferenceContext());
4973 } catch (Infer.InferenceException ex) {
4974 //invalid target type - propagate exception outwards or report error
4975 //depending on the current check context
4976 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4977 return types.createErrorType(site);
4978 } catch (Resolve.InapplicableMethodException ex) {
4979 final JCDiagnostic diag = ex.getDiagnostic();
4980 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4981 @Override
4982 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4983 return new Pair<>(sym, diag);
4984 }
4985 };
4986 List<Type> argtypes2 = argtypes.map(
4987 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4988 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4989 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4990 log.report(errDiag);
4991 return types.createErrorType(site);
4992 }
4993 }
4994
4995 public void visitLiteral(JCLiteral tree) {
4996 result = check(tree, litType(tree.typetag).constType(tree.value),
4997 KindSelector.VAL, resultInfo);
4998 }
4999 //where
5000 /** Return the type of a literal with given type tag.
5001 */
5002 Type litType(TypeTag tag) {
5003 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5004 }
5005
5006 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5007 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5008 }
5009
5010 public void visitTypeArray(JCArrayTypeTree tree) {
5011 Type etype = attribType(tree.elemtype, env);
5012 Type type = new ArrayType(etype, syms.arrayClass);
5013 result = check(tree, type, KindSelector.TYP, resultInfo);
5014 }
5015
5016 /** Visitor method for parameterized types.
5017 * Bound checking is left until later, since types are attributed
5018 * before supertype structure is completely known
5019 */
5020 public void visitTypeApply(JCTypeApply tree) {
5021 Type owntype = types.createErrorType(tree.type);
5022
5023 // Attribute functor part of application and make sure it's a class.
5024 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5025
5026 // Attribute type parameters
5027 List<Type> actuals = attribTypes(tree.arguments, env);
5028
5029 if (clazztype.hasTag(CLASS)) {
5030 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5031 if (actuals.isEmpty()) //diamond
5032 actuals = formals;
5033
5034 if (actuals.length() == formals.length()) {
5035 List<Type> a = actuals;
5036 List<Type> f = formals;
5037 while (a.nonEmpty()) {
5038 a.head = a.head.withTypeVar(f.head);
5039 a = a.tail;
5040 f = f.tail;
5041 }
5042 // Compute the proper generic outer
5043 Type clazzOuter = clazztype.getEnclosingType();
5044 if (clazzOuter.hasTag(CLASS)) {
5045 Type site;
5046 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5047 if (clazz.hasTag(IDENT)) {
5048 site = env.enclClass.sym.type;
5049 } else if (clazz.hasTag(SELECT)) {
5050 site = ((JCFieldAccess) clazz).selected.type;
5051 } else throw new AssertionError(""+tree);
5052 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5053 if (site.hasTag(CLASS))
5054 site = types.asOuterSuper(site, clazzOuter.tsym);
5055 if (site == null)
5056 site = types.erasure(clazzOuter);
5057 clazzOuter = site;
5058 }
5059 }
5060 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5061 clazztype.getMetadata());
5062 } else {
5063 if (formals.length() != 0) {
5064 log.error(tree.pos(),
5065 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5066 } else {
5067 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5068 }
5069 owntype = types.createErrorType(tree.type);
5070 }
5071 } else if (clazztype.hasTag(ERROR)) {
5072 ErrorType parameterizedErroneous =
5073 new ErrorType(clazztype.getOriginalType(),
5074 clazztype.tsym,
5075 clazztype.getMetadata());
5076
5077 parameterizedErroneous.typarams_field = actuals;
5078 owntype = parameterizedErroneous;
5079 }
5080 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5081 }
5082
5083 public void visitTypeUnion(JCTypeUnion tree) {
5084 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5085 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5086 for (JCExpression typeTree : tree.alternatives) {
5087 Type ctype = attribType(typeTree, env);
5088 ctype = chk.checkType(typeTree.pos(),
5089 chk.checkClassType(typeTree.pos(), ctype),
5090 syms.throwableType);
5091 if (!ctype.isErroneous()) {
5092 //check that alternatives of a union type are pairwise
5093 //unrelated w.r.t. subtyping
5094 if (chk.intersects(ctype, multicatchTypes.toList())) {
5095 for (Type t : multicatchTypes) {
5096 boolean sub = types.isSubtype(ctype, t);
5097 boolean sup = types.isSubtype(t, ctype);
5098 if (sub || sup) {
5099 //assume 'a' <: 'b'
5100 Type a = sub ? ctype : t;
5101 Type b = sub ? t : ctype;
5102 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5103 }
5104 }
5105 }
5106 multicatchTypes.append(ctype);
5107 if (all_multicatchTypes != null)
5108 all_multicatchTypes.append(ctype);
5109 } else {
5110 if (all_multicatchTypes == null) {
5111 all_multicatchTypes = new ListBuffer<>();
5112 all_multicatchTypes.appendList(multicatchTypes);
5113 }
5114 all_multicatchTypes.append(ctype);
5115 }
5116 }
5117 Type t = check(tree, types.lub(multicatchTypes.toList()),
5118 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5119 if (t.hasTag(CLASS)) {
5120 List<Type> alternatives =
5121 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5122 t = new UnionClassType((ClassType) t, alternatives);
5123 }
5124 tree.type = result = t;
5125 }
5126
5127 public void visitTypeIntersection(JCTypeIntersection tree) {
5128 attribTypes(tree.bounds, env);
5129 tree.type = result = checkIntersection(tree, tree.bounds);
5130 }
5131
5132 public void visitTypeParameter(JCTypeParameter tree) {
5133 TypeVar typeVar = (TypeVar) tree.type;
5134
5135 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5136 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5137 }
5138
5139 if (!typeVar.getUpperBound().isErroneous()) {
5140 //fixup type-parameter bound computed in 'attribTypeVariables'
5141 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5142 }
5143 }
5144
5145 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5146 Set<Symbol> boundSet = new HashSet<>();
5147 if (bounds.nonEmpty()) {
5148 // accept class or interface or typevar as first bound.
5149 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5150 boundSet.add(types.erasure(bounds.head.type).tsym);
5151 if (bounds.head.type.isErroneous()) {
5152 return bounds.head.type;
5153 }
5154 else if (bounds.head.type.hasTag(TYPEVAR)) {
5155 // if first bound was a typevar, do not accept further bounds.
5156 if (bounds.tail.nonEmpty()) {
5157 log.error(bounds.tail.head.pos(),
5158 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5159 return bounds.head.type;
5160 }
5161 } else {
5162 // if first bound was a class or interface, accept only interfaces
5163 // as further bounds.
5164 for (JCExpression bound : bounds.tail) {
5165 bound.type = checkBase(bound.type, bound, env, false, true, false);
5166 if (bound.type.isErroneous()) {
5167 bounds = List.of(bound);
5168 }
5169 else if (bound.type.hasTag(CLASS)) {
5170 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5171 }
5172 }
5173 }
5174 }
5175
5176 if (bounds.length() == 0) {
5177 return syms.objectType;
5178 } else if (bounds.length() == 1) {
5179 return bounds.head.type;
5180 } else {
5181 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5182 // ... the variable's bound is a class type flagged COMPOUND
5183 // (see comment for TypeVar.bound).
5184 // In this case, generate a class tree that represents the
5185 // bound class, ...
5186 JCExpression extending;
5187 List<JCExpression> implementing;
5188 if (!bounds.head.type.isInterface()) {
5189 extending = bounds.head;
5190 implementing = bounds.tail;
5191 } else {
5192 extending = null;
5193 implementing = bounds;
5194 }
5195 JCClassDecl cd = make.at(tree).ClassDef(
5196 make.Modifiers(PUBLIC | ABSTRACT),
5197 names.empty, List.nil(),
5198 extending, implementing, List.nil());
5199
5200 ClassSymbol c = (ClassSymbol)owntype.tsym;
5201 Assert.check((c.flags() & COMPOUND) != 0);
5202 cd.sym = c;
5203 c.sourcefile = env.toplevel.sourcefile;
5204
5205 // ... and attribute the bound class
5206 c.flags_field |= UNATTRIBUTED;
5207 Env<AttrContext> cenv = enter.classEnv(cd, env);
5208 typeEnvs.put(c, cenv);
5209 attribClass(c);
5210 return owntype;
5211 }
5212 }
5213
5214 public void visitWildcard(JCWildcard tree) {
5215 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5216 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5217 ? syms.objectType
5218 : attribType(tree.inner, env);
5219 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5220 tree.kind.kind,
5221 syms.boundClass),
5222 KindSelector.TYP, resultInfo);
5223 }
5224
5225 public void visitAnnotation(JCAnnotation tree) {
5226 Assert.error("should be handled in annotate");
5227 }
5228
5229 @Override
5230 public void visitModifiers(JCModifiers tree) {
5231 //error recovery only:
5232 Assert.check(resultInfo.pkind == KindSelector.ERR);
5233
5234 attribAnnotationTypes(tree.annotations, env);
5235 }
5236
5237 public void visitAnnotatedType(JCAnnotatedType tree) {
5238 attribAnnotationTypes(tree.annotations, env);
5239 Type underlyingType = attribType(tree.underlyingType, env);
5240 Type annotatedType = underlyingType.preannotatedType();
5241
5242 if (!env.info.isNewClass)
5243 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5244 result = tree.type = annotatedType;
5245 }
5246
5247 public void visitErroneous(JCErroneous tree) {
5248 if (tree.errs != null) {
5249 WriteableScope newScope = env.info.scope;
5250
5251 if (env.tree instanceof JCClassDecl) {
5252 Symbol fakeOwner =
5253 new MethodSymbol(BLOCK, names.empty, null,
5254 env.info.scope.owner);
5255 newScope = newScope.dupUnshared(fakeOwner);
5256 }
5257
5258 Env<AttrContext> errEnv =
5259 env.dup(env.tree,
5260 env.info.dup(newScope));
5261 errEnv.info.returnResult = unknownExprInfo;
5262 for (JCTree err : tree.errs)
5263 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5264 }
5265 result = tree.type = syms.errType;
5266 }
5267
5268 /** Default visitor method for all other trees.
5269 */
5270 public void visitTree(JCTree tree) {
5271 throw new AssertionError();
5272 }
5273
5274 /**
5275 * Attribute an env for either a top level tree or class or module declaration.
5276 */
5277 public void attrib(Env<AttrContext> env) {
5278 switch (env.tree.getTag()) {
5279 case MODULEDEF:
5280 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5281 break;
5282 case PACKAGEDEF:
5283 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5284 break;
5285 default:
5286 attribClass(env.tree.pos(), env.enclClass.sym);
5287 }
5288
5289 annotate.flush();
5290 }
5291
5292 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5293 try {
5294 annotate.flush();
5295 attribPackage(p);
5296 } catch (CompletionFailure ex) {
5297 chk.completionError(pos, ex);
5298 }
5299 }
5300
5301 void attribPackage(PackageSymbol p) {
5302 attribWithLint(p,
5303 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5304 }
5305
5306 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5307 try {
5308 annotate.flush();
5309 attribModule(m);
5310 } catch (CompletionFailure ex) {
5311 chk.completionError(pos, ex);
5312 }
5313 }
5314
5315 void attribModule(ModuleSymbol m) {
5316 attribWithLint(m, env -> attribStat(env.tree, env));
5317 }
5318
5319 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5320 Env<AttrContext> env = typeEnvs.get(sym);
5321
5322 Env<AttrContext> lintEnv = env;
5323 while (lintEnv.info.lint == null)
5324 lintEnv = lintEnv.next;
5325
5326 Lint lint = lintEnv.info.lint.augment(sym);
5327
5328 Lint prevLint = chk.setLint(lint);
5329 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5330
5331 try {
5332 deferredLintHandler.flush(env.tree, lint);
5333 attrib.accept(env);
5334 } finally {
5335 log.useSource(prev);
5336 chk.setLint(prevLint);
5337 }
5338 }
5339
5340 /** Main method: attribute class definition associated with given class symbol.
5341 * reporting completion failures at the given position.
5342 * @param pos The source position at which completion errors are to be
5343 * reported.
5344 * @param c The class symbol whose definition will be attributed.
5345 */
5346 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5347 try {
5348 annotate.flush();
5349 attribClass(c);
5350 } catch (CompletionFailure ex) {
5351 chk.completionError(pos, ex);
5352 }
5353 }
5354
5355 /** Attribute class definition associated with given class symbol.
5356 * @param c The class symbol whose definition will be attributed.
5357 */
5358 void attribClass(ClassSymbol c) throws CompletionFailure {
5359 if (c.type.hasTag(ERROR)) return;
5360
5361 // Check for cycles in the inheritance graph, which can arise from
5362 // ill-formed class files.
5363 chk.checkNonCyclic(null, c.type);
5364
5365 Type st = types.supertype(c.type);
5366 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5367 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5368 // First, attribute superclass.
5369 if (st.hasTag(CLASS))
5370 attribClass((ClassSymbol)st.tsym);
5371
5372 // Next attribute owner, if it is a class.
5373 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5374 attribClass((ClassSymbol)c.owner);
5375
5376 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5377 }
5378
5379 // The previous operations might have attributed the current class
5380 // if there was a cycle. So we test first whether the class is still
5381 // UNATTRIBUTED.
5382 if ((c.flags_field & UNATTRIBUTED) != 0) {
5383 c.flags_field &= ~UNATTRIBUTED;
5384
5385 // Get environment current at the point of class definition.
5386 Env<AttrContext> env = typeEnvs.get(c);
5387
5388 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5389 // because the annotations were not available at the time the env was created. Therefore,
5390 // we look up the environment chain for the first enclosing environment for which the
5391 // lint value is set. Typically, this is the parent env, but might be further if there
5392 // are any envs created as a result of TypeParameter nodes.
5393 Env<AttrContext> lintEnv = env;
5394 while (lintEnv.info.lint == null)
5395 lintEnv = lintEnv.next;
5396
5397 // Having found the enclosing lint value, we can initialize the lint value for this class
5398 env.info.lint = lintEnv.info.lint.augment(c);
5399
5400 Lint prevLint = chk.setLint(env.info.lint);
5401 JavaFileObject prev = log.useSource(c.sourcefile);
5402 ResultInfo prevReturnRes = env.info.returnResult;
5403
5404 try {
5405 if (c.isSealed() &&
5406 !c.isEnum() &&
5407 !c.isPermittedExplicit &&
5408 c.getPermittedSubclasses().isEmpty()) {
5409 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5410 }
5411
5412 if (c.isSealed()) {
5413 Set<Symbol> permittedTypes = new HashSet<>();
5414 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5415 for (Type subType : c.getPermittedSubclasses()) {
5416 if (subType.isErroneous()) {
5417 // the type already caused errors, don't produce more potentially misleading errors
5418 continue;
5419 }
5420 boolean isTypeVar = false;
5421 if (subType.getTag() == TYPEVAR) {
5422 isTypeVar = true; //error recovery
5423 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5424 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5425 }
5426 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5427 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5428 }
5429 if (permittedTypes.contains(subType.tsym)) {
5430 DiagnosticPosition pos =
5431 env.enclClass.permitting.stream()
5432 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5433 .limit(2).collect(List.collector()).get(1);
5434 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5435 } else {
5436 permittedTypes.add(subType.tsym);
5437 }
5438 if (sealedInUnnamed) {
5439 if (subType.tsym.packge() != c.packge()) {
5440 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5441 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5442 );
5443 }
5444 } else if (subType.tsym.packge().modle != c.packge().modle) {
5445 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5446 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5447 );
5448 }
5449 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5450 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5451 Errors.InvalidPermitsClause(
5452 subType.tsym == c.type.tsym ?
5453 Fragments.MustNotBeSameClass :
5454 Fragments.MustNotBeSupertype(subType)
5455 )
5456 );
5457 } else if (!isTypeVar) {
5458 boolean thisIsASuper = types.directSupertypes(subType)
5459 .stream()
5460 .anyMatch(d -> d.tsym == c);
5461 if (!thisIsASuper) {
5462 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5463 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5464 }
5465 }
5466 }
5467 }
5468
5469 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5470 .stream()
5471 .filter(s -> s.tsym.isSealed())
5472 .map(s -> (ClassSymbol) s.tsym)
5473 .collect(List.collector());
5474
5475 if (sealedSupers.isEmpty()) {
5476 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5477 boolean hasErrorSuper = false;
5478
5479 hasErrorSuper |= types.directSupertypes(c.type)
5480 .stream()
5481 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5482
5483 ClassType ct = (ClassType) c.type;
5484
5485 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5486
5487 if (!hasErrorSuper) {
5488 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5489 }
5490 }
5491 } else {
5492 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5493 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5494 }
5495
5496 if (!c.type.isCompound()) {
5497 for (ClassSymbol supertypeSym : sealedSupers) {
5498 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5499 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5500 }
5501 }
5502 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5503 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5504 c.isInterface() ?
5505 Errors.NonSealedOrSealedExpected :
5506 Errors.NonSealedSealedOrFinalExpected);
5507 }
5508 }
5509 }
5510
5511 deferredLintHandler.flush(env.tree, env.info.lint);
5512 env.info.returnResult = null;
5513 // java.lang.Enum may not be subclassed by a non-enum
5514 if (st.tsym == syms.enumSym &&
5515 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5516 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5517
5518 // Enums may not be extended by source-level classes
5519 if (st.tsym != null &&
5520 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5521 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5522 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5523 }
5524
5525 if (rs.isSerializable(c.type)) {
5526 env.info.isSerializable = true;
5527 }
5528
5529 attribClassBody(env, c);
5530
5531 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5532 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5533 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5534 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5535
5536 if (c.isImplicit()) {
5537 chk.checkHasMain(env.tree.pos(), c);
5538 }
5539 } finally {
5540 env.info.returnResult = prevReturnRes;
5541 log.useSource(prev);
5542 chk.setLint(prevLint);
5543 }
5544
5545 }
5546 }
5547
5548 public void visitImport(JCImport tree) {
5549 // nothing to do
5550 }
5551
5552 public void visitModuleDef(JCModuleDecl tree) {
5553 tree.sym.completeUsesProvides();
5554 ModuleSymbol msym = tree.sym;
5555 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5556 Lint prevLint = chk.setLint(lint);
5557 chk.checkModuleName(tree);
5558 chk.checkDeprecatedAnnotation(tree, msym);
5559
5560 try {
5561 deferredLintHandler.flush(tree, lint);
5562 } finally {
5563 chk.setLint(prevLint);
5564 }
5565 }
5566
5567 /** Finish the attribution of a class. */
5568 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5569 JCClassDecl tree = (JCClassDecl)env.tree;
5570 Assert.check(c == tree.sym);
5571
5572 // Validate type parameters, supertype and interfaces.
5573 attribStats(tree.typarams, env);
5574 if (!c.isAnonymous()) {
5575 //already checked if anonymous
5576 chk.validate(tree.typarams, env);
5577 chk.validate(tree.extending, env);
5578 chk.validate(tree.implementing, env);
5579 }
5580
5581 c.markAbstractIfNeeded(types);
5582
5583 // If this is a non-abstract class, check that it has no abstract
5584 // methods or unimplemented methods of an implemented interface.
5585 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5586 chk.checkAllDefined(tree.pos(), c);
5587 }
5588
5589 if ((c.flags() & ANNOTATION) != 0) {
5590 if (tree.implementing.nonEmpty())
5591 log.error(tree.implementing.head.pos(),
5592 Errors.CantExtendIntfAnnotation);
5593 if (tree.typarams.nonEmpty()) {
5594 log.error(tree.typarams.head.pos(),
5595 Errors.IntfAnnotationCantHaveTypeParams(c));
5596 }
5597
5598 // If this annotation type has a @Repeatable, validate
5599 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5600 // If this annotation type has a @Repeatable, validate
5601 if (repeatable != null) {
5602 // get diagnostic position for error reporting
5603 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5604 Assert.checkNonNull(cbPos);
5605
5606 chk.validateRepeatable(c, repeatable, cbPos);
5607 }
5608 } else {
5609 // Check that all extended classes and interfaces
5610 // are compatible (i.e. no two define methods with same arguments
5611 // yet different return types). (JLS 8.4.8.3)
5612 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5613 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5614 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5615 }
5616
5617 // Check that class does not import the same parameterized interface
5618 // with two different argument lists.
5619 chk.checkClassBounds(tree.pos(), c.type);
5620
5621 tree.type = c.type;
5622
5623 for (List<JCTypeParameter> l = tree.typarams;
5624 l.nonEmpty(); l = l.tail) {
5625 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5626 }
5627
5628 // Check that a generic class doesn't extend Throwable
5629 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5630 log.error(tree.extending.pos(), Errors.GenericThrowable);
5631
5632 // Check that all methods which implement some
5633 // method conform to the method they implement.
5634 chk.checkImplementations(tree);
5635
5636 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5637 checkAutoCloseable(tree.pos(), env, c.type);
5638
5639 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5640 // Attribute declaration
5641 attribStat(l.head, env);
5642 // Check that declarations in inner classes are not static (JLS 8.1.2)
5643 // Make an exception for static constants.
5644 if (!allowRecords &&
5645 c.owner.kind != PCK &&
5646 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5647 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5648 VarSymbol sym = null;
5649 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5650 if (sym == null ||
5651 sym.kind != VAR ||
5652 sym.getConstValue() == null)
5653 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5654 }
5655 }
5656
5657 // Check for proper placement of super()/this() calls.
5658 chk.checkSuperInitCalls(tree);
5659
5660 // Check for cycles among non-initial constructors.
5661 chk.checkCyclicConstructors(tree);
5662
5663 // Check for cycles among annotation elements.
5664 chk.checkNonCyclicElements(tree);
5665
5666 // Check for proper use of serialVersionUID and other
5667 // serialization-related fields and methods
5668 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5669 && rs.isSerializable(c.type)
5670 && !c.isAnonymous()) {
5671 chk.checkSerialStructure(tree, c);
5672 }
5673 // Correctly organize the positions of the type annotations
5674 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5675
5676 // Check type annotations applicability rules
5677 validateTypeAnnotations(tree, false);
5678 }
5679 // where
5680 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5681 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5682 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5683 if (types.isSameType(al.head.annotationType.type, t))
5684 return al.head.pos();
5685 }
5686
5687 return null;
5688 }
5689
5690 private Type capture(Type type) {
5691 return types.capture(type);
5692 }
5693
5694 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5695 if (type.isErroneous()) {
5696 tree.vartype = make.at(Position.NOPOS).Erroneous();
5697 } else {
5698 tree.vartype = make.at(Position.NOPOS).Type(type);
5699 }
5700 }
5701
5702 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5703 tree.accept(new TypeAnnotationsValidator(sigOnly));
5704 }
5705 //where
5706 private final class TypeAnnotationsValidator extends TreeScanner {
5707
5708 private final boolean sigOnly;
5709 public TypeAnnotationsValidator(boolean sigOnly) {
5710 this.sigOnly = sigOnly;
5711 }
5712
5713 public void visitAnnotation(JCAnnotation tree) {
5714 chk.validateTypeAnnotation(tree, null, false);
5715 super.visitAnnotation(tree);
5716 }
5717 public void visitAnnotatedType(JCAnnotatedType tree) {
5718 if (!tree.underlyingType.type.isErroneous()) {
5719 super.visitAnnotatedType(tree);
5720 }
5721 }
5722 public void visitTypeParameter(JCTypeParameter tree) {
5723 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5724 scan(tree.bounds);
5725 // Don't call super.
5726 // This is needed because above we call validateTypeAnnotation with
5727 // false, which would forbid annotations on type parameters.
5728 // super.visitTypeParameter(tree);
5729 }
5730 public void visitMethodDef(JCMethodDecl tree) {
5731 if (tree.recvparam != null &&
5732 !tree.recvparam.vartype.type.isErroneous()) {
5733 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5734 }
5735 if (tree.restype != null && tree.restype.type != null) {
5736 validateAnnotatedType(tree.restype, tree.restype.type);
5737 }
5738 if (sigOnly) {
5739 scan(tree.mods);
5740 scan(tree.restype);
5741 scan(tree.typarams);
5742 scan(tree.recvparam);
5743 scan(tree.params);
5744 scan(tree.thrown);
5745 } else {
5746 scan(tree.defaultValue);
5747 scan(tree.body);
5748 }
5749 }
5750 public void visitVarDef(final JCVariableDecl tree) {
5751 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5752 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5753 validateAnnotatedType(tree.vartype, tree.sym.type);
5754 scan(tree.mods);
5755 scan(tree.vartype);
5756 if (!sigOnly) {
5757 scan(tree.init);
5758 }
5759 }
5760 public void visitTypeCast(JCTypeCast tree) {
5761 if (tree.clazz != null && tree.clazz.type != null)
5762 validateAnnotatedType(tree.clazz, tree.clazz.type);
5763 super.visitTypeCast(tree);
5764 }
5765 public void visitTypeTest(JCInstanceOf tree) {
5766 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5767 validateAnnotatedType(tree.pattern, tree.pattern.type);
5768 super.visitTypeTest(tree);
5769 }
5770 public void visitNewClass(JCNewClass tree) {
5771 if (tree.clazz != null && tree.clazz.type != null) {
5772 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5773 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5774 tree.clazz.type.tsym);
5775 }
5776 if (tree.def != null) {
5777 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5778 }
5779
5780 validateAnnotatedType(tree.clazz, tree.clazz.type);
5781 }
5782 super.visitNewClass(tree);
5783 }
5784 public void visitNewArray(JCNewArray tree) {
5785 if (tree.elemtype != null && tree.elemtype.type != null) {
5786 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5787 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5788 tree.elemtype.type.tsym);
5789 }
5790 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5791 }
5792 super.visitNewArray(tree);
5793 }
5794 public void visitClassDef(JCClassDecl tree) {
5795 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5796 if (sigOnly) {
5797 scan(tree.mods);
5798 scan(tree.typarams);
5799 scan(tree.extending);
5800 scan(tree.implementing);
5801 }
5802 for (JCTree member : tree.defs) {
5803 if (member.hasTag(Tag.CLASSDEF)) {
5804 continue;
5805 }
5806 scan(member);
5807 }
5808 }
5809 public void visitBlock(JCBlock tree) {
5810 if (!sigOnly) {
5811 scan(tree.stats);
5812 }
5813 }
5814
5815 /* I would want to model this after
5816 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5817 * and override visitSelect and visitTypeApply.
5818 * However, we only set the annotated type in the top-level type
5819 * of the symbol.
5820 * Therefore, we need to override each individual location where a type
5821 * can occur.
5822 */
5823 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5824 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5825
5826 if (type.isPrimitiveOrVoid()) {
5827 return;
5828 }
5829
5830 JCTree enclTr = errtree;
5831 Type enclTy = type;
5832
5833 boolean repeat = true;
5834 while (repeat) {
5835 if (enclTr.hasTag(TYPEAPPLY)) {
5836 List<Type> tyargs = enclTy.getTypeArguments();
5837 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5838 if (trargs.length() > 0) {
5839 // Nothing to do for diamonds
5840 if (tyargs.length() == trargs.length()) {
5841 for (int i = 0; i < tyargs.length(); ++i) {
5842 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5843 }
5844 }
5845 // If the lengths don't match, it's either a diamond
5846 // or some nested type that redundantly provides
5847 // type arguments in the tree.
5848 }
5849
5850 // Look at the clazz part of a generic type
5851 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5852 }
5853
5854 if (enclTr.hasTag(SELECT)) {
5855 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5856 if (enclTy != null &&
5857 !enclTy.hasTag(NONE)) {
5858 enclTy = enclTy.getEnclosingType();
5859 }
5860 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5861 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5862 if (enclTy == null || enclTy.hasTag(NONE)) {
5863 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5864 for (JCAnnotation an : at.getAnnotations()) {
5865 if (chk.isTypeAnnotation(an, false)) {
5866 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5867 }
5868 }
5869 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5870 if (!onlyTypeAnnotations.isEmpty()) {
5871 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5872 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5873 Fragments.TypeAnnotation(onlyTypeAnnotations);
5874 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5875 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5876 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5877 type.tsym.owner, annotatedType));
5878 }
5879 repeat = false;
5880 }
5881 enclTr = at.underlyingType;
5882 // enclTy doesn't need to be changed
5883 } else if (enclTr.hasTag(IDENT)) {
5884 repeat = false;
5885 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5886 JCWildcard wc = (JCWildcard) enclTr;
5887 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5888 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5889 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5890 } else {
5891 // Nothing to do for UNBOUND
5892 }
5893 repeat = false;
5894 } else if (enclTr.hasTag(TYPEARRAY)) {
5895 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5896 validateAnnotatedType(art.getType(), art.elemtype.type);
5897 repeat = false;
5898 } else if (enclTr.hasTag(TYPEUNION)) {
5899 JCTypeUnion ut = (JCTypeUnion) enclTr;
5900 for (JCTree t : ut.getTypeAlternatives()) {
5901 validateAnnotatedType(t, t.type);
5902 }
5903 repeat = false;
5904 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5905 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5906 for (JCTree t : it.getBounds()) {
5907 validateAnnotatedType(t, t.type);
5908 }
5909 repeat = false;
5910 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5911 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5912 repeat = false;
5913 } else {
5914 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5915 " within: "+ errtree + " with kind: " + errtree.getKind());
5916 }
5917 }
5918 }
5919
5920 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5921 Symbol sym) {
5922 // Ensure that no declaration annotations are present.
5923 // Note that a tree type might be an AnnotatedType with
5924 // empty annotations, if only declaration annotations were given.
5925 // This method will raise an error for such a type.
5926 for (JCAnnotation ai : annotations) {
5927 if (!ai.type.isErroneous() &&
5928 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5929 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5930 }
5931 }
5932 }
5933 }
5934
5935 // <editor-fold desc="post-attribution visitor">
5936
5937 /**
5938 * Handle missing types/symbols in an AST. This routine is useful when
5939 * the compiler has encountered some errors (which might have ended up
5940 * terminating attribution abruptly); if the compiler is used in fail-over
5941 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5942 * prevents NPE to be propagated during subsequent compilation steps.
5943 */
5944 public void postAttr(JCTree tree) {
5945 new PostAttrAnalyzer().scan(tree);
5946 }
5947
5948 class PostAttrAnalyzer extends TreeScanner {
5949
5950 private void initTypeIfNeeded(JCTree that) {
5951 if (that.type == null) {
5952 if (that.hasTag(METHODDEF)) {
5953 that.type = dummyMethodType((JCMethodDecl)that);
5954 } else {
5955 that.type = syms.unknownType;
5956 }
5957 }
5958 }
5959
5960 /* Construct a dummy method type. If we have a method declaration,
5961 * and the declared return type is void, then use that return type
5962 * instead of UNKNOWN to avoid spurious error messages in lambda
5963 * bodies (see:JDK-8041704).
5964 */
5965 private Type dummyMethodType(JCMethodDecl md) {
5966 Type restype = syms.unknownType;
5967 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5968 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5969 if (prim.typetag == VOID)
5970 restype = syms.voidType;
5971 }
5972 return new MethodType(List.nil(), restype,
5973 List.nil(), syms.methodClass);
5974 }
5975 private Type dummyMethodType() {
5976 return dummyMethodType(null);
5977 }
5978
5979 @Override
5980 public void scan(JCTree tree) {
5981 if (tree == null) return;
5982 if (tree instanceof JCExpression) {
5983 initTypeIfNeeded(tree);
5984 }
5985 super.scan(tree);
5986 }
5987
5988 @Override
5989 public void visitIdent(JCIdent that) {
5990 if (that.sym == null) {
5991 that.sym = syms.unknownSymbol;
5992 }
5993 }
5994
5995 @Override
5996 public void visitSelect(JCFieldAccess that) {
5997 if (that.sym == null) {
5998 that.sym = syms.unknownSymbol;
5999 }
6000 super.visitSelect(that);
6001 }
6002
6003 @Override
6004 public void visitClassDef(JCClassDecl that) {
6005 initTypeIfNeeded(that);
6006 if (that.sym == null) {
6007 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6008 }
6009 super.visitClassDef(that);
6010 }
6011
6012 @Override
6013 public void visitMethodDef(JCMethodDecl that) {
6014 initTypeIfNeeded(that);
6015 if (that.sym == null) {
6016 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6017 }
6018 super.visitMethodDef(that);
6019 }
6020
6021 @Override
6022 public void visitVarDef(JCVariableDecl that) {
6023 initTypeIfNeeded(that);
6024 if (that.sym == null) {
6025 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6026 that.sym.adr = 0;
6027 }
6028 if (that.vartype == null) {
6029 that.vartype = make.at(Position.NOPOS).Erroneous();
6030 }
6031 super.visitVarDef(that);
6032 }
6033
6034 @Override
6035 public void visitBindingPattern(JCBindingPattern that) {
6036 initTypeIfNeeded(that);
6037 initTypeIfNeeded(that.var);
6038 if (that.var.sym == null) {
6039 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6040 that.var.sym.adr = 0;
6041 }
6042 super.visitBindingPattern(that);
6043 }
6044
6045 @Override
6046 public void visitRecordPattern(JCRecordPattern that) {
6047 initTypeIfNeeded(that);
6048 if (that.record == null) {
6049 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6050 that.type, syms.noSymbol);
6051 }
6052 if (that.fullComponentTypes == null) {
6053 that.fullComponentTypes = List.nil();
6054 }
6055 super.visitRecordPattern(that);
6056 }
6057
6058 @Override
6059 public void visitNewClass(JCNewClass that) {
6060 if (that.constructor == null) {
6061 that.constructor = new MethodSymbol(0, names.init,
6062 dummyMethodType(), syms.noSymbol);
6063 }
6064 if (that.constructorType == null) {
6065 that.constructorType = syms.unknownType;
6066 }
6067 super.visitNewClass(that);
6068 }
6069
6070 @Override
6071 public void visitAssignop(JCAssignOp that) {
6072 if (that.operator == null) {
6073 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6074 -1, syms.noSymbol);
6075 }
6076 super.visitAssignop(that);
6077 }
6078
6079 @Override
6080 public void visitBinary(JCBinary that) {
6081 if (that.operator == null) {
6082 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6083 -1, syms.noSymbol);
6084 }
6085 super.visitBinary(that);
6086 }
6087
6088 @Override
6089 public void visitUnary(JCUnary that) {
6090 if (that.operator == null) {
6091 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6092 -1, syms.noSymbol);
6093 }
6094 super.visitUnary(that);
6095 }
6096
6097 @Override
6098 public void visitReference(JCMemberReference that) {
6099 super.visitReference(that);
6100 if (that.sym == null) {
6101 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6102 syms.noSymbol);
6103 }
6104 }
6105 }
6106 // </editor-fold>
6107
6108 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6109 new TreeScanner() {
6110 Symbol packge = pkg;
6111 @Override
6112 public void visitIdent(JCIdent that) {
6113 that.sym = packge;
6114 }
6115
6116 @Override
6117 public void visitSelect(JCFieldAccess that) {
6118 that.sym = packge;
6119 packge = packge.owner;
6120 super.visitSelect(that);
6121 }
6122 }.scan(pid);
6123 }
6124
6125 }