1 /*
2 * Copyright (c) 1999, 2021, 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
31 import javax.lang.model.element.ElementKind;
32 import javax.tools.JavaFileObject;
33
34 import com.sun.source.tree.CaseTree;
35 import com.sun.source.tree.IdentifierTree;
36 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
37 import com.sun.source.tree.MemberSelectTree;
38 import com.sun.source.tree.TreeVisitor;
39 import com.sun.source.util.SimpleTreeVisitor;
40 import com.sun.tools.javac.code.*;
41 import com.sun.tools.javac.code.Lint.LintCategory;
42 import com.sun.tools.javac.code.Scope.WriteableScope;
43 import com.sun.tools.javac.code.Source.Feature;
44 import com.sun.tools.javac.code.Symbol.*;
45 import com.sun.tools.javac.code.Type.*;
46 import com.sun.tools.javac.code.TypeMetadata.Annotations;
47 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
48 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
49 import com.sun.tools.javac.comp.Check.CheckContext;
50 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
51 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
52 import com.sun.tools.javac.jvm.*;
53 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
54 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
56 import com.sun.tools.javac.resources.CompilerProperties.Errors;
57 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
58 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
59 import com.sun.tools.javac.tree.*;
60 import com.sun.tools.javac.tree.JCTree.*;
61 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
62 import com.sun.tools.javac.util.*;
63 import com.sun.tools.javac.util.DefinedBy.Api;
64 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
65 import com.sun.tools.javac.util.JCDiagnostic.Error;
66 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
67 import com.sun.tools.javac.util.JCDiagnostic.Warning;
68 import com.sun.tools.javac.util.List;
69
70 import static com.sun.tools.javac.code.Flags.*;
71 import static com.sun.tools.javac.code.Flags.ANNOTATION;
72 import static com.sun.tools.javac.code.Flags.BLOCK;
73 import static com.sun.tools.javac.code.Kinds.*;
74 import static com.sun.tools.javac.code.Kinds.Kind.*;
75 import static com.sun.tools.javac.code.TypeTag.*;
76 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
77 import static com.sun.tools.javac.tree.JCTree.Tag.*;
78 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
79
80 /** This is the main context-dependent analysis phase in GJC. It
81 * encompasses name resolution, type checking and constant folding as
82 * subtasks. Some subtasks involve auxiliary classes.
83 * @see Check
84 * @see Resolve
85 * @see ConstFold
86 * @see Infer
87 *
88 * <p><b>This is NOT part of any supported API.
89 * If you write code that depends on this, you do so at your own risk.
90 * This code and its internal interfaces are subject to change or
91 * deletion without notice.</b>
92 */
93 public class Attr extends JCTree.Visitor {
94 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
95
96 final Names names;
97 final Log log;
98 final Symtab syms;
99 final Resolve rs;
100 final Operators operators;
101 final Infer infer;
102 final Analyzer analyzer;
103 final DeferredAttr deferredAttr;
104 final Check chk;
105 final Flow flow;
106 final MemberEnter memberEnter;
107 final TypeEnter typeEnter;
108 final TreeMaker make;
109 final ConstFold cfolder;
110 final Enter enter;
111 final Target target;
112 final Types types;
113 final Preview preview;
114 final JCDiagnostic.Factory diags;
115 final TypeAnnotations typeAnnotations;
116 final DeferredLintHandler deferredLintHandler;
117 final TypeEnvs typeEnvs;
118 final Dependencies dependencies;
119 final Annotate annotate;
120 final ArgumentAttr argumentAttr;
121 final MatchBindingsComputer matchBindingsComputer;
122 final AttrRecover attrRecover;
123
124 public static Attr instance(Context context) {
125 Attr instance = context.get(attrKey);
126 if (instance == null)
127 instance = new Attr(context);
128 return instance;
129 }
130
131 protected Attr(Context context) {
132 context.put(attrKey, this);
133
134 names = Names.instance(context);
135 log = Log.instance(context);
136 syms = Symtab.instance(context);
137 rs = Resolve.instance(context);
138 operators = Operators.instance(context);
139 chk = Check.instance(context);
140 flow = Flow.instance(context);
141 memberEnter = MemberEnter.instance(context);
142 typeEnter = TypeEnter.instance(context);
143 make = TreeMaker.instance(context);
144 enter = Enter.instance(context);
145 infer = Infer.instance(context);
146 analyzer = Analyzer.instance(context);
147 deferredAttr = DeferredAttr.instance(context);
148 cfolder = ConstFold.instance(context);
149 target = Target.instance(context);
150 types = Types.instance(context);
151 preview = Preview.instance(context);
152 diags = JCDiagnostic.Factory.instance(context);
153 annotate = Annotate.instance(context);
154 typeAnnotations = TypeAnnotations.instance(context);
155 deferredLintHandler = DeferredLintHandler.instance(context);
156 typeEnvs = TypeEnvs.instance(context);
157 dependencies = Dependencies.instance(context);
158 argumentAttr = ArgumentAttr.instance(context);
159 matchBindingsComputer = MatchBindingsComputer.instance(context);
160 attrRecover = AttrRecover.instance(context);
161
162 Options options = Options.instance(context);
163
164 Source source = Source.instance(context);
165 allowPoly = Feature.POLY.allowedInSource(source);
166 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
167 allowLambda = Feature.LAMBDA.allowedInSource(source);
168 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
169 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
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 sourceName = source.name;
175 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
176
177 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
178 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
179 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
180 methodAttrInfo = new MethodAttrInfo();
181 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
182 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
183 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
184 }
185
186 /** Switch: support target-typing inference
187 */
188 boolean allowPoly;
189
190 /** Switch: support type annotations.
191 */
192 boolean allowTypeAnnos;
193
194 /** Switch: support lambda expressions ?
195 */
196 boolean allowLambda;
197
198 /** Switch: support default methods ?
199 */
200 boolean allowDefaultMethods;
201
202 /** Switch: static interface methods enabled?
203 */
204 boolean allowStaticInterfaceMethods;
205
206 /** Switch: reifiable types in instanceof enabled?
207 */
208 boolean allowReifiableTypesInInstanceof;
209
210 /** Are records allowed
211 */
212 private final boolean allowRecords;
213
214 /** Are patterns in switch allowed
215 */
216 private final boolean allowPatternSwitch;
217
218 /**
219 * Switch: warn about use of variable before declaration?
220 * RFE: 6425594
221 */
222 boolean useBeforeDeclarationWarning;
223
224 /**
225 * Switch: name of source level; used for error reporting.
226 */
227 String sourceName;
228
229 /** Check kind and type of given tree against protokind and prototype.
230 * If check succeeds, store type in tree and return it.
231 * If check fails, store errType in tree and return it.
232 * No checks are performed if the prototype is a method type.
233 * It is not necessary in this case since we know that kind and type
234 * are correct.
235 *
236 * @param tree The tree whose kind and type is checked
237 * @param found The computed type of the tree
238 * @param ownkind The computed kind of the tree
239 * @param resultInfo The expected result of the tree
240 */
241 Type check(final JCTree tree,
242 final Type found,
243 final KindSelector ownkind,
244 final ResultInfo resultInfo) {
245 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
246 Type owntype;
247 boolean shouldCheck = !found.hasTag(ERROR) &&
248 !resultInfo.pt.hasTag(METHOD) &&
249 !resultInfo.pt.hasTag(FORALL);
250 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
251 log.error(tree.pos(),
252 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
253 ownkind.kindNames()));
254 owntype = types.createErrorType(found);
255 } else if (allowPoly && inferenceContext.free(found)) {
256 //delay the check if there are inference variables in the found type
257 //this means we are dealing with a partially inferred poly expression
258 owntype = shouldCheck ? resultInfo.pt : found;
259 if (resultInfo.checkMode.installPostInferenceHook()) {
260 inferenceContext.addFreeTypeListener(List.of(found),
261 instantiatedContext -> {
262 ResultInfo pendingResult =
263 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
264 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
265 });
266 }
267 } else {
268 owntype = shouldCheck ?
269 resultInfo.check(tree, found) :
270 found;
271 }
272 if (resultInfo.checkMode.updateTreeType()) {
273 tree.type = owntype;
274 }
275 return owntype;
276 }
277
278 /** Is given blank final variable assignable, i.e. in a scope where it
279 * may be assigned to even though it is final?
280 * @param v The blank final variable.
281 * @param env The current environment.
282 */
283 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
284 Symbol owner = env.info.scope.owner;
285 // owner refers to the innermost variable, method or
286 // initializer block declaration at this point.
287 boolean isAssignable =
288 v.owner == owner
289 ||
290 ((owner.name == names.init || // i.e. we are in a constructor
291 owner.kind == VAR || // i.e. we are in a variable initializer
292 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
293 &&
294 v.owner == owner.owner
295 &&
296 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
297 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
298 return isAssignable & !insideCompactConstructor;
299 }
300
301 /** Check that variable can be assigned to.
302 * @param pos The current source code position.
303 * @param v The assigned variable
304 * @param base If the variable is referred to in a Select, the part
305 * to the left of the `.', null otherwise.
306 * @param env The current environment.
307 */
308 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
309 if (v.name == names._this) {
310 log.error(pos, Errors.CantAssignValToThis);
311 } else if ((v.flags() & FINAL) != 0 &&
312 ((v.flags() & HASINIT) != 0
313 ||
314 !((base == null ||
315 TreeInfo.isThisQualifier(base)) &&
316 isAssignableAsBlankFinal(v, env)))) {
317 if (v.isResourceVariable()) { //TWR resource
318 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
319 } else {
320 log.error(pos, Errors.CantAssignValToFinalVar(v));
321 }
322 }
323 }
324
325 /** Does tree represent a static reference to an identifier?
326 * It is assumed that tree is either a SELECT or an IDENT.
327 * We have to weed out selects from non-type names here.
328 * @param tree The candidate tree.
329 */
330 boolean isStaticReference(JCTree tree) {
331 if (tree.hasTag(SELECT)) {
332 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
333 if (lsym == null || lsym.kind != TYP) {
334 return false;
335 }
336 }
337 return true;
338 }
339
340 /** Is this symbol a type?
341 */
342 static boolean isType(Symbol sym) {
343 return sym != null && sym.kind == TYP;
344 }
345
346 /** The current `this' symbol.
347 * @param env The current environment.
348 */
349 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
350 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
351 }
352
353 /** Attribute a parsed identifier.
354 * @param tree Parsed identifier name
355 * @param topLevel The toplevel to use
356 */
357 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
358 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
359 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
360 syms.errSymbol.name,
361 null, null, null, null);
362 localEnv.enclClass.sym = syms.errSymbol;
363 return attribIdent(tree, localEnv);
364 }
365
366 /** Attribute a parsed identifier.
367 * @param tree Parsed identifier name
368 * @param env The env to use
369 */
370 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
371 return tree.accept(identAttributer, env);
372 }
373 // where
374 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
375 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
376 @Override @DefinedBy(Api.COMPILER_TREE)
377 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
378 Symbol site = visit(node.getExpression(), env);
379 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
380 return site;
381 Name name = (Name)node.getIdentifier();
382 if (site.kind == PCK) {
383 env.toplevel.packge = (PackageSymbol)site;
384 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
385 KindSelector.TYP_PCK);
386 } else {
387 env.enclClass.sym = (ClassSymbol)site;
388 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
389 }
390 }
391
392 @Override @DefinedBy(Api.COMPILER_TREE)
393 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
394 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
395 }
396 }
397
398 public Type coerce(Type etype, Type ttype) {
399 return cfolder.coerce(etype, ttype);
400 }
401
402 public Type attribType(JCTree node, TypeSymbol sym) {
403 Env<AttrContext> env = typeEnvs.get(sym);
404 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
405 return attribTree(node, localEnv, unknownTypeInfo);
406 }
407
408 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
409 // Attribute qualifying package or class.
410 JCFieldAccess s = (JCFieldAccess)tree.qualid;
411 return attribTree(s.selected, env,
412 new ResultInfo(tree.staticImport ?
413 KindSelector.TYP : KindSelector.TYP_PCK,
414 Type.noType));
415 }
416
417 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
418 return attribToTree(expr, env, tree, unknownExprInfo);
419 }
420
421 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
422 return attribToTree(stmt, env, tree, statInfo);
423 }
424
425 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
426 breakTree = tree;
427 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
428 try {
429 deferredAttr.attribSpeculative(root, env, resultInfo,
430 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
431 argumentAttr.withLocalCacheContext());
432 attrRecover.doRecovery();
433 } catch (BreakAttr b) {
434 return b.env;
435 } catch (AssertionError ae) {
436 if (ae.getCause() instanceof BreakAttr breakAttr) {
437 return breakAttr.env;
438 } else {
439 throw ae;
440 }
441 } finally {
442 breakTree = null;
443 log.useSource(prev);
444 }
445 return env;
446 }
447
448 private JCTree breakTree = null;
449
450 private static class BreakAttr extends RuntimeException {
451 static final long serialVersionUID = -6924771130405446405L;
452 private transient Env<AttrContext> env;
453 private BreakAttr(Env<AttrContext> env) {
454 this.env = env;
455 }
456 }
457
458 /**
459 * Mode controlling behavior of Attr.Check
460 */
461 enum CheckMode {
462
463 NORMAL,
464
465 /**
466 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
467 * that the captured var cache in {@code InferenceContext} will be used in read-only
468 * mode when performing inference checks.
469 */
470 NO_TREE_UPDATE {
471 @Override
472 public boolean updateTreeType() {
473 return false;
474 }
475 },
476 /**
477 * Mode signalling that caller will manage free types in tree decorations.
478 */
479 NO_INFERENCE_HOOK {
480 @Override
481 public boolean installPostInferenceHook() {
482 return false;
483 }
484 };
485
486 public boolean updateTreeType() {
487 return true;
488 }
489 public boolean installPostInferenceHook() {
490 return true;
491 }
492 }
493
494
495 class ResultInfo {
496 final KindSelector pkind;
497 final Type pt;
498 final CheckContext checkContext;
499 final CheckMode checkMode;
500
501 ResultInfo(KindSelector pkind, Type pt) {
502 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
503 }
504
505 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
506 this(pkind, pt, chk.basicHandler, checkMode);
507 }
508
509 protected ResultInfo(KindSelector pkind,
510 Type pt, CheckContext checkContext) {
511 this(pkind, pt, checkContext, CheckMode.NORMAL);
512 }
513
514 protected ResultInfo(KindSelector pkind,
515 Type pt, CheckContext checkContext, CheckMode checkMode) {
516 this.pkind = pkind;
517 this.pt = pt;
518 this.checkContext = checkContext;
519 this.checkMode = checkMode;
520 }
521
522 /**
523 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
524 * @param tree The tree to be type-checked.
525 * @return true if {@ArgumentAttr} should be used.
526 */
527 protected boolean needsArgumentAttr(JCTree tree) { return false; }
528
529 protected Type check(final DiagnosticPosition pos, final Type found) {
530 return chk.checkType(pos, found, pt, checkContext);
531 }
532
533 protected ResultInfo dup(Type newPt) {
534 return new ResultInfo(pkind, newPt, checkContext, checkMode);
535 }
536
537 protected ResultInfo dup(CheckContext newContext) {
538 return new ResultInfo(pkind, pt, newContext, checkMode);
539 }
540
541 protected ResultInfo dup(Type newPt, CheckContext newContext) {
542 return new ResultInfo(pkind, newPt, newContext, checkMode);
543 }
544
545 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
546 return new ResultInfo(pkind, newPt, newContext, newMode);
547 }
548
549 protected ResultInfo dup(CheckMode newMode) {
550 return new ResultInfo(pkind, pt, checkContext, newMode);
551 }
552
553 @Override
554 public String toString() {
555 if (pt != null) {
556 return pt.toString();
557 } else {
558 return "";
559 }
560 }
561 }
562
563 class MethodAttrInfo extends ResultInfo {
564 public MethodAttrInfo() {
565 this(chk.basicHandler);
566 }
567
568 public MethodAttrInfo(CheckContext checkContext) {
569 super(KindSelector.VAL, Infer.anyPoly, checkContext);
570 }
571
572 @Override
573 protected boolean needsArgumentAttr(JCTree tree) {
574 return true;
575 }
576
577 protected ResultInfo dup(Type newPt) {
578 throw new IllegalStateException();
579 }
580
581 protected ResultInfo dup(CheckContext newContext) {
582 return new MethodAttrInfo(newContext);
583 }
584
585 protected ResultInfo dup(Type newPt, CheckContext newContext) {
586 throw new IllegalStateException();
587 }
588
589 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
590 throw new IllegalStateException();
591 }
592
593 protected ResultInfo dup(CheckMode newMode) {
594 throw new IllegalStateException();
595 }
596 }
597
598 class RecoveryInfo extends ResultInfo {
599
600 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
601 this(deferredAttrContext, Type.recoveryType);
602 }
603
604 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
605 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
606 @Override
607 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
608 return deferredAttrContext;
609 }
610 @Override
611 public boolean compatible(Type found, Type req, Warner warn) {
612 return true;
613 }
614 @Override
615 public void report(DiagnosticPosition pos, JCDiagnostic details) {
616 boolean needsReport = pt == Type.recoveryType ||
617 (details.getDiagnosticPosition() != null &&
618 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
619 if (needsReport) {
620 chk.basicHandler.report(pos, details);
621 }
622 }
623 });
624 }
625 }
626
627 final ResultInfo statInfo;
628 final ResultInfo varAssignmentInfo;
629 final ResultInfo methodAttrInfo;
630 final ResultInfo unknownExprInfo;
631 final ResultInfo unknownTypeInfo;
632 final ResultInfo unknownTypeExprInfo;
633 final ResultInfo recoveryInfo;
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, allowPoly ? methodAttrInfo : unknownExprInfo));
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 JCVariableDecl variable,
855 Type type) {
856
857 DiagnosticPosition prevLintPos
858 = deferredLintHandler.setPos(variable.pos());
859
860 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
861 try {
862 Type itype = attribExpr(variable.init, env, type);
863 if (variable.isImplicitlyTyped()) {
864 //fixup local variable type
865 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
866 }
867 if (itype.constValue() != null) {
868 return coerce(itype, type).constValue();
869 } else {
870 return null;
871 }
872 } finally {
873 log.useSource(prevSource);
874 deferredLintHandler.setPos(prevLintPos);
875 }
876 }
877
878 /** Attribute type reference in an `extends' or `implements' clause.
879 * Supertypes of anonymous inner classes are usually already attributed.
880 *
881 * @param tree The tree making up the type reference.
882 * @param env The environment current at the reference.
883 * @param classExpected true if only a class is expected here.
884 * @param interfaceExpected true if only an interface is expected here.
885 */
886 Type attribBase(JCTree tree,
887 Env<AttrContext> env,
888 boolean classExpected,
889 boolean interfaceExpected,
890 boolean checkExtensible) {
891 Type t = tree.type != null ?
892 tree.type :
893 attribType(tree, env);
894 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
895 }
896 Type checkBase(Type t,
897 JCTree tree,
898 Env<AttrContext> env,
899 boolean classExpected,
900 boolean interfaceExpected,
901 boolean checkExtensible) {
902 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
903 (((JCTypeApply) tree).clazz).pos() : tree.pos();
904 if (t.tsym.isAnonymous()) {
905 log.error(pos, Errors.CantInheritFromAnon);
906 return types.createErrorType(t);
907 }
908 if (t.isErroneous())
909 return t;
910 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
911 // check that type variable is already visible
912 if (t.getUpperBound() == null) {
913 log.error(pos, Errors.IllegalForwardRef);
914 return types.createErrorType(t);
915 }
916 } else {
917 t = chk.checkClassType(pos, t, checkExtensible);
918 }
919 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
920 log.error(pos, Errors.IntfExpectedHere);
921 // return errType is necessary since otherwise there might
922 // be undetected cycles which cause attribution to loop
923 return types.createErrorType(t);
924 } else if (checkExtensible &&
925 classExpected &&
926 (t.tsym.flags() & INTERFACE) != 0) {
927 log.error(pos, Errors.NoIntfExpectedHere);
928 return types.createErrorType(t);
929 }
930 if (checkExtensible &&
931 ((t.tsym.flags() & FINAL) != 0)) {
932 log.error(pos,
933 Errors.CantInheritFromFinal(t.tsym));
934 }
935 chk.checkNonCyclic(pos, t);
936 return t;
937 }
938
939 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
940 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
941 id.type = env.info.scope.owner.enclClass().type;
942 id.sym = env.info.scope.owner.enclClass();
943 return id.type;
944 }
945
946 public void visitClassDef(JCClassDecl tree) {
947 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
948 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
949 argumentAttr.withLocalCacheContext() : null);
950 try {
951 // Local and anonymous classes have not been entered yet, so we need to
952 // do it now.
953 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
954 enter.classEnter(tree, env);
955 } else {
956 // If this class declaration is part of a class level annotation,
957 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
958 // order to simplify later steps and allow for sensible error
959 // messages.
960 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
961 enter.classEnter(tree, env);
962 }
963
964 ClassSymbol c = tree.sym;
965 if (c == null) {
966 // exit in case something drastic went wrong during enter.
967 result = null;
968 } else {
969 // make sure class has been completed:
970 c.complete();
971
972 // If this class appears as an anonymous class
973 // in a superclass constructor call
974 // disable implicit outer instance from being passed.
975 // (This would be an illegal access to "this before super").
976 if (env.info.isSelfCall &&
977 env.tree.hasTag(NEWCLASS)) {
978 c.flags_field |= NOOUTERTHIS;
979 }
980 attribClass(tree.pos(), c);
981 result = tree.type = c.type;
982 }
983 } finally {
984 localCacheContext.ifPresent(LocalCacheContext::leave);
985 }
986 }
987
988 public void visitMethodDef(JCMethodDecl tree) {
989 MethodSymbol m = tree.sym;
990 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
991
992 Lint lint = env.info.lint.augment(m);
993 Lint prevLint = chk.setLint(lint);
994 MethodSymbol prevMethod = chk.setMethod(m);
995 try {
996 deferredLintHandler.flush(tree.pos());
997 chk.checkDeprecatedAnnotation(tree.pos(), m);
998
999
1000 // Create a new environment with local scope
1001 // for attributing the method.
1002 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1003 localEnv.info.lint = lint;
1004
1005 attribStats(tree.typarams, localEnv);
1006
1007 // If we override any other methods, check that we do so properly.
1008 // JLS ???
1009 if (m.isStatic()) {
1010 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1011 } else {
1012 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1013 }
1014 chk.checkOverride(env, tree, m);
1015
1016 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1017 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1018 }
1019
1020 // Enter all type parameters into the local method scope.
1021 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1022 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1023
1024 ClassSymbol owner = env.enclClass.sym;
1025 if ((owner.flags() & ANNOTATION) != 0 &&
1026 (tree.params.nonEmpty() ||
1027 tree.recvparam != null))
1028 log.error(tree.params.nonEmpty() ?
1029 tree.params.head.pos() :
1030 tree.recvparam.pos(),
1031 Errors.IntfAnnotationMembersCantHaveParams);
1032
1033 // Attribute all value parameters.
1034 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1035 attribStat(l.head, localEnv);
1036 }
1037
1038 chk.checkVarargsMethodDecl(localEnv, tree);
1039
1040 // Check that type parameters are well-formed.
1041 chk.validate(tree.typarams, localEnv);
1042
1043 // Check that result type is well-formed.
1044 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1045 chk.validate(tree.restype, localEnv);
1046
1047 // Check that receiver type is well-formed.
1048 if (tree.recvparam != null) {
1049 // Use a new environment to check the receiver parameter.
1050 // Otherwise I get "might not have been initialized" errors.
1051 // Is there a better way?
1052 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1053 attribType(tree.recvparam, newEnv);
1054 chk.validate(tree.recvparam, newEnv);
1055 }
1056
1057 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1058 // lets find if this method is an accessor
1059 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1060 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1061 if (recordComponent.isPresent()) {
1062 // the method is a user defined accessor lets check that everything is fine
1063 if (!tree.sym.isPublic()) {
1064 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1065 }
1066 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1067 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1068 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1069 }
1070 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1071 log.error(tree,
1072 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1073 }
1074 if (!tree.typarams.isEmpty()) {
1075 log.error(tree,
1076 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1077 }
1078 if (tree.sym.isStatic()) {
1079 log.error(tree,
1080 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1081 }
1082 }
1083
1084 if (tree.name == names.init) {
1085 // if this a constructor other than the canonical one
1086 if ((tree.sym.flags_field & RECORD) == 0) {
1087 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1088 if (app == null ||
1089 TreeInfo.name(app.meth) != names._this ||
1090 !checkFirstConstructorStat(app, tree, false)) {
1091 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1092 }
1093 } else {
1094 // but if it is the canonical:
1095
1096 /* if user generated, then it shouldn't:
1097 * - have an accessibility stricter than that of the record type
1098 * - explicitly invoke any other constructor
1099 */
1100 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1101 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1102 log.error(tree,
1103 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1104 Errors.InvalidCanonicalConstructorInRecord(
1105 Fragments.Canonical,
1106 env.enclClass.sym.name,
1107 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1108 ) :
1109 Errors.InvalidCanonicalConstructorInRecord(
1110 Fragments.Canonical,
1111 env.enclClass.sym.name,
1112 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1113 )
1114 );
1115 }
1116
1117 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1118 if (app != null &&
1119 (TreeInfo.name(app.meth) == names._this ||
1120 TreeInfo.name(app.meth) == names._super) &&
1121 checkFirstConstructorStat(app, tree, false)) {
1122 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1123 Fragments.Canonical, env.enclClass.sym.name,
1124 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1125 }
1126 }
1127
1128 // also we want to check that no type variables have been defined
1129 if (!tree.typarams.isEmpty()) {
1130 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1131 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1132 }
1133
1134 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1135 * record components
1136 */
1137 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1138 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1139 for (JCVariableDecl param: tree.params) {
1140 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1141 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1142 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1143 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1144 Fragments.Canonical, env.enclClass.sym.name,
1145 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1146 }
1147 recordComponents = recordComponents.tail;
1148 recordFieldTypes = recordFieldTypes.tail;
1149 }
1150 }
1151 }
1152 }
1153
1154 // annotation method checks
1155 if ((owner.flags() & ANNOTATION) != 0) {
1156 // annotation method cannot have throws clause
1157 if (tree.thrown.nonEmpty()) {
1158 log.error(tree.thrown.head.pos(),
1159 Errors.ThrowsNotAllowedInIntfAnnotation);
1160 }
1161 // annotation method cannot declare type-parameters
1162 if (tree.typarams.nonEmpty()) {
1163 log.error(tree.typarams.head.pos(),
1164 Errors.IntfAnnotationMembersCantHaveTypeParams);
1165 }
1166 // validate annotation method's return type (could be an annotation type)
1167 chk.validateAnnotationType(tree.restype);
1168 // ensure that annotation method does not clash with members of Object/Annotation
1169 chk.validateAnnotationMethod(tree.pos(), m);
1170 }
1171
1172 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1173 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1174
1175 if (tree.body == null) {
1176 // Empty bodies are only allowed for
1177 // abstract, native, or interface methods, or for methods
1178 // in a retrofit signature class.
1179 if (tree.defaultValue != null) {
1180 if ((owner.flags() & ANNOTATION) == 0)
1181 log.error(tree.pos(),
1182 Errors.DefaultAllowedInIntfAnnotationMember);
1183 }
1184 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1185 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1186 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1187 if ((owner.flags() & INTERFACE) != 0) {
1188 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1189 } else {
1190 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1191 }
1192 } else if ((tree.mods.flags & NATIVE) != 0) {
1193 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1194 } else {
1195 // Add an implicit super() call unless an explicit call to
1196 // super(...) or this(...) is given
1197 // or we are compiling class java.lang.Object.
1198 if (tree.name == names.init && owner.type != syms.objectType) {
1199 JCBlock body = tree.body;
1200 if (body.stats.isEmpty() ||
1201 TreeInfo.getConstructorInvocationName(body.stats, names) == names.empty) {
1202 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1203 make.Ident(names._super), make.Idents(List.nil())));
1204 body.stats = body.stats.prepend(supCall);
1205 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1206 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1207 TreeInfo.isSuperCall(body.stats.head)) {
1208 // enum constructors are not allowed to call super
1209 // directly, so make sure there aren't any super calls
1210 // in enum constructors, except in the compiler
1211 // generated one.
1212 log.error(tree.body.stats.head.pos(),
1213 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1214 }
1215 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1216 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1217 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1218 if (!initParamNames.equals(recordComponentNames)) {
1219 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1220 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1221 }
1222 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1223 log.error(tree,
1224 Errors.InvalidCanonicalConstructorInRecord(
1225 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1226 env.enclClass.sym.name,
1227 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1229 }
1230 }
1231 }
1232
1233 // Attribute all type annotations in the body
1234 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1235 annotate.flush();
1236
1237 // Attribute method body.
1238 attribStat(tree.body, localEnv);
1239 }
1240
1241 localEnv.info.scope.leave();
1242 result = tree.type = m.type;
1243 } finally {
1244 chk.setLint(prevLint);
1245 chk.setMethod(prevMethod);
1246 }
1247 }
1248
1249 public void visitVarDef(JCVariableDecl tree) {
1250 // Local variables have not been entered yet, so we need to do it now:
1251 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1252 if (tree.sym != null) {
1253 // parameters have already been entered
1254 env.info.scope.enter(tree.sym);
1255 } else {
1256 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1257 if (tree.init == null) {
1258 //cannot use 'var' without initializer
1259 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1260 tree.vartype = make.Erroneous();
1261 } else {
1262 Fragment msg = canInferLocalVarType(tree);
1263 if (msg != null) {
1264 //cannot use 'var' with initializer which require an explicit target
1265 //(e.g. lambda, method reference, array initializer).
1266 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1267 tree.vartype = make.Erroneous();
1268 }
1269 }
1270 }
1271 try {
1272 annotate.blockAnnotations();
1273 memberEnter.memberEnter(tree, env);
1274 } finally {
1275 annotate.unblockAnnotations();
1276 }
1277 }
1278 } else {
1279 if (tree.init != null) {
1280 // Field initializer expression need to be entered.
1281 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1282 annotate.flush();
1283 }
1284 }
1285
1286 VarSymbol v = tree.sym;
1287 Lint lint = env.info.lint.augment(v);
1288 Lint prevLint = chk.setLint(lint);
1289
1290 // Check that the variable's declared type is well-formed.
1291 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1292 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1293 (tree.sym.flags() & PARAMETER) != 0;
1294 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1295
1296 try {
1297 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1298 deferredLintHandler.flush(tree.pos());
1299 chk.checkDeprecatedAnnotation(tree.pos(), v);
1300
1301 if (tree.init != null) {
1302 if ((v.flags_field & FINAL) == 0 ||
1303 !memberEnter.needsLazyConstValue(tree.init)) {
1304 // Not a compile-time constant
1305 // Attribute initializer in a new environment
1306 // with the declared variable as owner.
1307 // Check that initializer conforms to variable's declared type.
1308 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1309 initEnv.info.lint = lint;
1310 // In order to catch self-references, we set the variable's
1311 // declaration position to maximal possible value, effectively
1312 // marking the variable as undefined.
1313 initEnv.info.enclVar = v;
1314 attribExpr(tree.init, initEnv, v.type);
1315 if (tree.isImplicitlyTyped()) {
1316 //fixup local variable type
1317 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1318 }
1319 }
1320 if (tree.isImplicitlyTyped()) {
1321 setSyntheticVariableType(tree, v.type);
1322 }
1323 }
1324 result = tree.type = v.type;
1325 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1326 if (isNonArgsMethodInObject(v.name)) {
1327 log.error(tree, Errors.IllegalRecordComponentName(v));
1328 }
1329 }
1330 }
1331 finally {
1332 chk.setLint(prevLint);
1333 }
1334 }
1335
1336 private boolean isNonArgsMethodInObject(Name name) {
1337 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1338 if (s.type.getParameterTypes().isEmpty()) {
1339 return true;
1340 }
1341 }
1342 return false;
1343 }
1344
1345 Fragment canInferLocalVarType(JCVariableDecl tree) {
1346 LocalInitScanner lis = new LocalInitScanner();
1347 lis.scan(tree.init);
1348 return lis.badInferenceMsg;
1349 }
1350
1351 static class LocalInitScanner extends TreeScanner {
1352 Fragment badInferenceMsg = null;
1353 boolean needsTarget = true;
1354
1355 @Override
1356 public void visitNewArray(JCNewArray tree) {
1357 if (tree.elemtype == null && needsTarget) {
1358 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1359 }
1360 }
1361
1362 @Override
1363 public void visitLambda(JCLambda tree) {
1364 if (needsTarget) {
1365 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1366 }
1367 }
1368
1369 @Override
1370 public void visitTypeCast(JCTypeCast tree) {
1371 boolean prevNeedsTarget = needsTarget;
1372 try {
1373 needsTarget = false;
1374 super.visitTypeCast(tree);
1375 } finally {
1376 needsTarget = prevNeedsTarget;
1377 }
1378 }
1379
1380 @Override
1381 public void visitReference(JCMemberReference tree) {
1382 if (needsTarget) {
1383 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1384 }
1385 }
1386
1387 @Override
1388 public void visitNewClass(JCNewClass tree) {
1389 boolean prevNeedsTarget = needsTarget;
1390 try {
1391 needsTarget = false;
1392 super.visitNewClass(tree);
1393 } finally {
1394 needsTarget = prevNeedsTarget;
1395 }
1396 }
1397
1398 @Override
1399 public void visitApply(JCMethodInvocation tree) {
1400 boolean prevNeedsTarget = needsTarget;
1401 try {
1402 needsTarget = false;
1403 super.visitApply(tree);
1404 } finally {
1405 needsTarget = prevNeedsTarget;
1406 }
1407 }
1408 }
1409
1410 public void visitSkip(JCSkip tree) {
1411 result = null;
1412 }
1413
1414 public void visitBlock(JCBlock tree) {
1415 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1416 // Block is a static or instance initializer;
1417 // let the owner of the environment be a freshly
1418 // created BLOCK-method.
1419 Symbol fakeOwner =
1420 new MethodSymbol(tree.flags | BLOCK |
1421 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1422 env.info.scope.owner);
1423 final Env<AttrContext> localEnv =
1424 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1425
1426 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1427 // Attribute all type annotations in the block
1428 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1429 annotate.flush();
1430 attribStats(tree.stats, localEnv);
1431
1432 {
1433 // Store init and clinit type annotations with the ClassSymbol
1434 // to allow output in Gen.normalizeDefs.
1435 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1436 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1437 if ((tree.flags & STATIC) != 0) {
1438 cs.appendClassInitTypeAttributes(tas);
1439 } else {
1440 cs.appendInitTypeAttributes(tas);
1441 }
1442 }
1443 } else {
1444 // Create a new local environment with a local scope.
1445 Env<AttrContext> localEnv =
1446 env.dup(tree, env.info.dup(env.info.scope.dup()));
1447 try {
1448 attribStats(tree.stats, localEnv);
1449 } finally {
1450 localEnv.info.scope.leave();
1451 }
1452 }
1453 result = null;
1454 }
1455
1456 public void visitDoLoop(JCDoWhileLoop tree) {
1457 attribStat(tree.body, env.dup(tree));
1458 attribExpr(tree.cond, env, syms.booleanType);
1459 if (!breaksOutOf(tree, tree.body)) {
1460 //include condition's body when false after the while, if cannot get out of the loop
1461 MatchBindings condBindings = matchBindings;
1462 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1463 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1464 }
1465 result = null;
1466 }
1467
1468 public void visitWhileLoop(JCWhileLoop tree) {
1469 attribExpr(tree.cond, env, syms.booleanType);
1470 MatchBindings condBindings = matchBindings;
1471 // include condition's bindings when true in the body:
1472 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1473 try {
1474 attribStat(tree.body, whileEnv.dup(tree));
1475 } finally {
1476 whileEnv.info.scope.leave();
1477 }
1478 if (!breaksOutOf(tree, tree.body)) {
1479 //include condition's bindings when false after the while, if cannot get out of the loop
1480 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1481 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1482 }
1483 result = null;
1484 }
1485
1486 private boolean breaksOutOf(JCTree loop, JCTree body) {
1487 preFlow(body);
1488 return flow.breaksOutOf(env, loop, body, make);
1489 }
1490
1491 public void visitForLoop(JCForLoop tree) {
1492 Env<AttrContext> loopEnv =
1493 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1494 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1495 try {
1496 attribStats(tree.init, loopEnv);
1497 if (tree.cond != null) {
1498 attribExpr(tree.cond, loopEnv, syms.booleanType);
1499 // include condition's bindings when true in the body and step:
1500 condBindings = matchBindings;
1501 }
1502 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1503 try {
1504 bodyEnv.tree = tree; // before, we were not in loop!
1505 attribStats(tree.step, bodyEnv);
1506 attribStat(tree.body, bodyEnv);
1507 } finally {
1508 bodyEnv.info.scope.leave();
1509 }
1510 result = null;
1511 }
1512 finally {
1513 loopEnv.info.scope.leave();
1514 }
1515 if (!breaksOutOf(tree, tree.body)) {
1516 //include condition's body when false after the while, if cannot get out of the loop
1517 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1518 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1519 }
1520 }
1521
1522 public void visitForeachLoop(JCEnhancedForLoop tree) {
1523 Env<AttrContext> loopEnv =
1524 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1525 try {
1526 //the Formal Parameter of a for-each loop is not in the scope when
1527 //attributing the for-each expression; we mimic this by attributing
1528 //the for-each expression first (against original scope).
1529 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1530 chk.checkNonVoid(tree.pos(), exprType);
1531 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1532 if (elemtype == null) {
1533 // or perhaps expr implements Iterable<T>?
1534 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1535 if (base == null) {
1536 log.error(tree.expr.pos(),
1537 Errors.ForeachNotApplicableToType(exprType,
1538 Fragments.TypeReqArrayOrIterable));
1539 elemtype = types.createErrorType(exprType);
1540 } else {
1541 List<Type> iterableParams = base.allparams();
1542 elemtype = iterableParams.isEmpty()
1543 ? syms.objectType
1544 : types.wildUpperBound(iterableParams.head);
1545
1546 // Check the return type of the method iterator().
1547 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1548 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1549 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1550 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1551 log.error(tree.pos(),
1552 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1553 }
1554 }
1555 }
1556 if (tree.var.isImplicitlyTyped()) {
1557 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1558 setSyntheticVariableType(tree.var, inferredType);
1559 }
1560 attribStat(tree.var, loopEnv);
1561 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1562 loopEnv.tree = tree; // before, we were not in loop!
1563 attribStat(tree.body, loopEnv);
1564 result = null;
1565 }
1566 finally {
1567 loopEnv.info.scope.leave();
1568 }
1569 }
1570
1571 public void visitLabelled(JCLabeledStatement tree) {
1572 // Check that label is not used in an enclosing statement
1573 Env<AttrContext> env1 = env;
1574 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1575 if (env1.tree.hasTag(LABELLED) &&
1576 ((JCLabeledStatement) env1.tree).label == tree.label) {
1577 log.error(tree.pos(),
1578 Errors.LabelAlreadyInUse(tree.label));
1579 break;
1580 }
1581 env1 = env1.next;
1582 }
1583
1584 attribStat(tree.body, env.dup(tree));
1585 result = null;
1586 }
1587
1588 public void visitSwitch(JCSwitch tree) {
1589 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1590 attribStats(c.stats, caseEnv);
1591 });
1592 result = null;
1593 }
1594
1595 public void visitSwitchExpression(JCSwitchExpression tree) {
1596 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1597 PolyKind.STANDALONE : PolyKind.POLY;
1598
1599 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1600 //this means we are returning a poly conditional from void-compatible lambda expression
1601 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1602 result = tree.type = types.createErrorType(resultInfo.pt);
1603 return;
1604 }
1605
1606 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1607 unknownExprInfo :
1608 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1609
1610 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1611 ListBuffer<Type> caseTypes = new ListBuffer<>();
1612
1613 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1614 caseEnv.info.yieldResult = condInfo;
1615 attribStats(c.stats, caseEnv);
1616 new TreeScanner() {
1617 @Override
1618 public void visitYield(JCYield brk) {
1619 if (brk.target == tree) {
1620 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1621 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1622 }
1623 super.visitYield(brk);
1624 }
1625
1626 @Override public void visitClassDef(JCClassDecl tree) {}
1627 @Override public void visitLambda(JCLambda tree) {}
1628 }.scan(c.stats);
1629 });
1630
1631 if (tree.cases.isEmpty()) {
1632 log.error(tree.pos(),
1633 Errors.SwitchExpressionEmpty);
1634 } else if (caseTypes.isEmpty()) {
1635 log.error(tree.pos(),
1636 Errors.SwitchExpressionNoResultExpressions);
1637 }
1638
1639 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1640
1641 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1642 }
1643 //where:
1644 CheckContext switchExpressionContext(CheckContext checkContext) {
1645 return new Check.NestedCheckContext(checkContext) {
1646 //this will use enclosing check context to check compatibility of
1647 //subexpression against target type; if we are in a method check context,
1648 //depending on whether boxing is allowed, we could have incompatibilities
1649 @Override
1650 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1651 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1652 }
1653 };
1654 }
1655
1656 private void handleSwitch(JCTree switchTree,
1657 JCExpression selector,
1658 List<JCCase> cases,
1659 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1660 Type seltype = attribExpr(selector, env);
1661
1662 Env<AttrContext> switchEnv =
1663 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1664
1665 try {
1666 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1667 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1668 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1669 boolean patternSwitch;
1670 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1671 !types.isAssignable(seltype, syms.intType)) {
1672 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1673 patternSwitch = true;
1674 } else {
1675 patternSwitch = cases.stream()
1676 .flatMap(c -> c.labels.stream())
1677 .anyMatch(l -> l.isPattern());
1678 }
1679
1680 // Attribute all cases and
1681 // check that there are no duplicate case labels or default clauses.
1682 Set<Object> labels = new HashSet<>(); // The set of case labels.
1683 List<Type> coveredTypes = List.nil();
1684 boolean hasDefault = false; // Is there a default label?
1685 boolean hasTotalPattern = false; // Is there a total pattern?
1686 boolean hasNullPattern = false; // Is there a null pattern?
1687 CaseTree.CaseKind caseKind = null;
1688 boolean wasError = false;
1689 MatchBindings prevBindings = null;
1690 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1691 JCCase c = l.head;
1692 if (caseKind == null) {
1693 caseKind = c.caseKind;
1694 } else if (caseKind != c.caseKind && !wasError) {
1695 log.error(c.pos(),
1696 Errors.SwitchMixingCaseTypes);
1697 wasError = true;
1698 }
1699 MatchBindings currentBindings = prevBindings;
1700 boolean wasTotalPattern = hasTotalPattern;
1701 for (JCCaseLabel pat : c.labels) {
1702 if (pat.isExpression()) {
1703 JCExpression expr = (JCExpression) pat;
1704 if (TreeInfo.isNull(expr)) {
1705 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1706 if (hasNullPattern) {
1707 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1708 } else if (wasTotalPattern) {
1709 log.error(pat.pos(), Errors.PatternDominated);
1710 }
1711 hasNullPattern = true;
1712 attribExpr(expr, switchEnv, seltype);
1713 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1714 } else if (enumSwitch) {
1715 Symbol sym = enumConstant(expr, seltype);
1716 if (sym == null) {
1717 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1718 } else if (!labels.add(sym)) {
1719 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1720 } else {
1721 checkCaseLabelDominated(pat.pos(), coveredTypes, sym.type);
1722 }
1723 } else if (errorEnumSwitch) {
1724 //error recovery: the selector is erroneous, and all the case labels
1725 //are identifiers. This could be an enum switch - don't report resolve
1726 //error for the case label:
1727 var prevResolveHelper = rs.basicLogResolveHelper;
1728 try {
1729 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1730 attribExpr(pat, switchEnv, seltype);
1731 } finally {
1732 rs.basicLogResolveHelper = prevResolveHelper;
1733 }
1734 } else {
1735 ResultInfo valTypInfo = new ResultInfo(KindSelector.VAL_TYP,
1736 !seltype.hasTag(ERROR) ? seltype
1737 : Type.noType);
1738 Type pattype = attribTree(expr, switchEnv, valTypInfo);
1739 if (!pattype.hasTag(ERROR)) {
1740 if (pattype.constValue() == null) {
1741 Symbol s = TreeInfo.symbol(expr);
1742 if (s != null && s.kind == TYP && allowPatternSwitch) {
1743 log.error(expr.pos(),
1744 Errors.PatternExpected);
1745 } else {
1746 log.error(expr.pos(),
1747 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1748 }
1749 } else if (!stringSwitch && !types.isAssignable(seltype, syms.intType)) {
1750 log.error(pat.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1751 } else if (!labels.add(pattype.constValue())) {
1752 log.error(c.pos(), Errors.DuplicateCaseLabel);
1753 } else {
1754 checkCaseLabelDominated(pat.pos(), coveredTypes, types.boxedTypeOrType(pattype));
1755 }
1756 }
1757 }
1758 } else if (pat.hasTag(DEFAULTCASELABEL)) {
1759 if (hasDefault) {
1760 log.error(pat.pos(), Errors.DuplicateDefaultLabel);
1761 } else if (hasTotalPattern) {
1762 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1763 }
1764 hasDefault = true;
1765 matchBindings = MatchBindingsComputer.EMPTY;
1766 } else {
1767 //binding pattern
1768 attribExpr(pat, switchEnv);
1769 var primary = TreeInfo.primaryPatternType((JCPattern) pat);
1770 Type primaryType = primary.type();
1771 if (!primaryType.hasTag(TYPEVAR)) {
1772 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1773 }
1774 checkCastablePattern(pat.pos(), seltype, primaryType);
1775 Type patternType = types.erasure(primaryType);
1776 boolean isTotal = primary.unconditional() &&
1777 !patternType.isErroneous() &&
1778 types.isSubtype(types.erasure(seltype), patternType);
1779 if (isTotal) {
1780 if (hasTotalPattern) {
1781 log.error(pat.pos(), Errors.DuplicateTotalPattern);
1782 } else if (hasDefault) {
1783 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1784 }
1785 hasTotalPattern = true;
1786 }
1787 checkCaseLabelDominated(pat.pos(), coveredTypes, patternType);
1788 if (primary.unconditional() && !patternType.isErroneous()) {
1789 coveredTypes = coveredTypes.prepend(patternType);
1790 }
1791 }
1792 currentBindings = matchBindingsComputer.switchCase(pat, currentBindings, matchBindings);
1793 }
1794 Env<AttrContext> caseEnv =
1795 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1796 try {
1797 attribCase.accept(c, caseEnv);
1798 } finally {
1799 caseEnv.info.scope.leave();
1800 }
1801 addVars(c.stats, switchEnv.info.scope);
1802
1803 preFlow(c);
1804 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1805
1806 prevBindings = c.caseKind == CaseTree.CaseKind.STATEMENT && c.completesNormally ? currentBindings
1807 : null;
1808 }
1809 if (patternSwitch) {
1810 chk.checkSwitchCaseStructure(cases);
1811 }
1812 if (switchTree.hasTag(SWITCH)) {
1813 ((JCSwitch) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1814 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1815 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1816 ((JCSwitchExpression) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1817 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1818 } else {
1819 Assert.error(switchTree.getTag().name());
1820 }
1821 } finally {
1822 switchEnv.info.scope.leave();
1823 }
1824 }
1825 // where
1826 /** Add any variables defined in stats to the switch scope. */
1827 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1828 for (;stats.nonEmpty(); stats = stats.tail) {
1829 JCTree stat = stats.head;
1830 if (stat.hasTag(VARDEF))
1831 switchScope.enter(((JCVariableDecl) stat).sym);
1832 }
1833 }
1834 private void checkCaseLabelDominated(DiagnosticPosition pos,
1835 List<Type> coveredTypes, Type patternType) {
1836 for (Type existing : coveredTypes) {
1837 if (types.isSubtype(patternType, existing)) {
1838 log.error(pos, Errors.PatternDominated);
1839 }
1840 }
1841 }
1842 // where
1843 /** Return the selected enumeration constant symbol, or null. */
1844 private Symbol enumConstant(JCTree tree, Type enumType) {
1845 if (tree.hasTag(IDENT)) {
1846 JCIdent ident = (JCIdent)tree;
1847 Name name = ident.name;
1848 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1849 if (sym.kind == VAR) {
1850 Symbol s = ident.sym = sym;
1851 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1852 ident.type = s.type;
1853 return ((s.flags_field & Flags.ENUM) == 0)
1854 ? null : s;
1855 }
1856 }
1857 }
1858 return null;
1859 }
1860
1861 public void visitSynchronized(JCSynchronized tree) {
1862 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1863 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1864 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1865 }
1866 attribStat(tree.body, env);
1867 result = null;
1868 }
1869 // where
1870 private boolean isValueBased(Type t) {
1871 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1872 }
1873
1874
1875 public void visitTry(JCTry tree) {
1876 // Create a new local environment with a local
1877 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1878 try {
1879 boolean isTryWithResource = tree.resources.nonEmpty();
1880 // Create a nested environment for attributing the try block if needed
1881 Env<AttrContext> tryEnv = isTryWithResource ?
1882 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1883 localEnv;
1884 try {
1885 // Attribute resource declarations
1886 for (JCTree resource : tree.resources) {
1887 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1888 @Override
1889 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1890 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1891 }
1892 };
1893 ResultInfo twrResult =
1894 new ResultInfo(KindSelector.VAR,
1895 syms.autoCloseableType,
1896 twrContext);
1897 if (resource.hasTag(VARDEF)) {
1898 attribStat(resource, tryEnv);
1899 twrResult.check(resource, resource.type);
1900
1901 //check that resource type cannot throw InterruptedException
1902 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1903
1904 VarSymbol var = ((JCVariableDecl) resource).sym;
1905 var.setData(ElementKind.RESOURCE_VARIABLE);
1906 } else {
1907 attribTree(resource, tryEnv, twrResult);
1908 }
1909 }
1910 // Attribute body
1911 attribStat(tree.body, tryEnv);
1912 } finally {
1913 if (isTryWithResource)
1914 tryEnv.info.scope.leave();
1915 }
1916
1917 // Attribute catch clauses
1918 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1919 JCCatch c = l.head;
1920 Env<AttrContext> catchEnv =
1921 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1922 try {
1923 Type ctype = attribStat(c.param, catchEnv);
1924 if (TreeInfo.isMultiCatch(c)) {
1925 //multi-catch parameter is implicitly marked as final
1926 c.param.sym.flags_field |= FINAL | UNION;
1927 }
1928 if (c.param.sym.kind == VAR) {
1929 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1930 }
1931 chk.checkType(c.param.vartype.pos(),
1932 chk.checkClassType(c.param.vartype.pos(), ctype),
1933 syms.throwableType);
1934 attribStat(c.body, catchEnv);
1935 } finally {
1936 catchEnv.info.scope.leave();
1937 }
1938 }
1939
1940 // Attribute finalizer
1941 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1942 result = null;
1943 }
1944 finally {
1945 localEnv.info.scope.leave();
1946 }
1947 }
1948
1949 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1950 if (!resource.isErroneous() &&
1951 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1952 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1953 Symbol close = syms.noSymbol;
1954 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1955 try {
1956 close = rs.resolveQualifiedMethod(pos,
1957 env,
1958 types.skipTypeVars(resource, false),
1959 names.close,
1960 List.nil(),
1961 List.nil());
1962 }
1963 finally {
1964 log.popDiagnosticHandler(discardHandler);
1965 }
1966 if (close.kind == MTH &&
1967 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1968 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1969 env.info.lint.isEnabled(LintCategory.TRY)) {
1970 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1971 }
1972 }
1973 }
1974
1975 public void visitConditional(JCConditional tree) {
1976 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1977 MatchBindings condBindings = matchBindings;
1978
1979 tree.polyKind = (!allowPoly ||
1980 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
1981 isBooleanOrNumeric(env, tree)) ?
1982 PolyKind.STANDALONE : PolyKind.POLY;
1983
1984 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1985 //this means we are returning a poly conditional from void-compatible lambda expression
1986 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
1987 result = tree.type = types.createErrorType(resultInfo.pt);
1988 return;
1989 }
1990
1991 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1992 unknownExprInfo :
1993 resultInfo.dup(conditionalContext(resultInfo.checkContext));
1994
1995
1996 // x ? y : z
1997 // include x's bindings when true in y
1998 // include x's bindings when false in z
1999
2000 Type truetype;
2001 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2002 try {
2003 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2004 } finally {
2005 trueEnv.info.scope.leave();
2006 }
2007
2008 MatchBindings trueBindings = matchBindings;
2009
2010 Type falsetype;
2011 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2012 try {
2013 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2014 } finally {
2015 falseEnv.info.scope.leave();
2016 }
2017
2018 MatchBindings falseBindings = matchBindings;
2019
2020 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2021 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2022 List.of(truetype, falsetype)) : pt();
2023 if (condtype.constValue() != null &&
2024 truetype.constValue() != null &&
2025 falsetype.constValue() != null &&
2026 !owntype.hasTag(NONE)) {
2027 //constant folding
2028 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2029 }
2030 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2031 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2032 }
2033 //where
2034 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2035 switch (tree.getTag()) {
2036 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2037 ((JCLiteral)tree).typetag == BOOLEAN ||
2038 ((JCLiteral)tree).typetag == BOT;
2039 case LAMBDA: case REFERENCE: return false;
2040 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2041 case CONDEXPR:
2042 JCConditional condTree = (JCConditional)tree;
2043 return isBooleanOrNumeric(env, condTree.truepart) &&
2044 isBooleanOrNumeric(env, condTree.falsepart);
2045 case APPLY:
2046 JCMethodInvocation speculativeMethodTree =
2047 (JCMethodInvocation)deferredAttr.attribSpeculative(
2048 tree, env, unknownExprInfo,
2049 argumentAttr.withLocalCacheContext());
2050 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2051 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2052 env.enclClass.type :
2053 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2054 Type owntype = types.memberType(receiverType, msym).getReturnType();
2055 return primitiveOrBoxed(owntype);
2056 case NEWCLASS:
2057 JCExpression className =
2058 removeClassParams.translate(((JCNewClass)tree).clazz);
2059 JCExpression speculativeNewClassTree =
2060 (JCExpression)deferredAttr.attribSpeculative(
2061 className, env, unknownTypeInfo,
2062 argumentAttr.withLocalCacheContext());
2063 return primitiveOrBoxed(speculativeNewClassTree.type);
2064 default:
2065 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2066 argumentAttr.withLocalCacheContext()).type;
2067 return primitiveOrBoxed(speculativeType);
2068 }
2069 }
2070 //where
2071 boolean primitiveOrBoxed(Type t) {
2072 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2073 }
2074
2075 TreeTranslator removeClassParams = new TreeTranslator() {
2076 @Override
2077 public void visitTypeApply(JCTypeApply tree) {
2078 result = translate(tree.clazz);
2079 }
2080 };
2081
2082 CheckContext conditionalContext(CheckContext checkContext) {
2083 return new Check.NestedCheckContext(checkContext) {
2084 //this will use enclosing check context to check compatibility of
2085 //subexpression against target type; if we are in a method check context,
2086 //depending on whether boxing is allowed, we could have incompatibilities
2087 @Override
2088 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2089 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2090 }
2091 };
2092 }
2093
2094 /** Compute the type of a conditional expression, after
2095 * checking that it exists. See JLS 15.25. Does not take into
2096 * account the special case where condition and both arms
2097 * are constants.
2098 *
2099 * @param pos The source position to be used for error
2100 * diagnostics.
2101 * @param thentype The type of the expression's then-part.
2102 * @param elsetype The type of the expression's else-part.
2103 */
2104 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2105 if (condTypes.isEmpty()) {
2106 return syms.objectType; //TODO: how to handle?
2107 }
2108 Type first = condTypes.head;
2109 // If same type, that is the result
2110 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2111 return first.baseType();
2112
2113 List<Type> unboxedTypes = condTypes.stream()
2114 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2115 .collect(List.collector());
2116
2117 // Otherwise, if both arms can be converted to a numeric
2118 // type, return the least numeric type that fits both arms
2119 // (i.e. return larger of the two, or return int if one
2120 // arm is short, the other is char).
2121 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2122 // If one arm has an integer subrange type (i.e., byte,
2123 // short, or char), and the other is an integer constant
2124 // that fits into the subrange, return the subrange type.
2125 for (Type type : unboxedTypes) {
2126 if (!type.getTag().isStrictSubRangeOf(INT)) {
2127 continue;
2128 }
2129 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2130 return type.baseType();
2131 }
2132
2133 for (TypeTag tag : primitiveTags) {
2134 Type candidate = syms.typeOfTag[tag.ordinal()];
2135 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2136 return candidate;
2137 }
2138 }
2139 }
2140
2141 // Those were all the cases that could result in a primitive
2142 condTypes = condTypes.stream()
2143 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2144 .collect(List.collector());
2145
2146 for (Type type : condTypes) {
2147 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2148 return type.baseType();
2149 }
2150
2151 Iterator<DiagnosticPosition> posIt = positions.iterator();
2152
2153 condTypes = condTypes.stream()
2154 .map(t -> chk.checkNonVoid(posIt.next(), t))
2155 .collect(List.collector());
2156
2157 // both are known to be reference types. The result is
2158 // lub(thentype,elsetype). This cannot fail, as it will
2159 // always be possible to infer "Object" if nothing better.
2160 return types.lub(condTypes.stream()
2161 .map(t -> t.baseType())
2162 .filter(t -> !t.hasTag(BOT))
2163 .collect(List.collector()));
2164 }
2165
2166 static final TypeTag[] primitiveTags = new TypeTag[]{
2167 BYTE,
2168 CHAR,
2169 SHORT,
2170 INT,
2171 LONG,
2172 FLOAT,
2173 DOUBLE,
2174 BOOLEAN,
2175 };
2176
2177 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2178 return bindingEnv(env, env.tree, bindings);
2179 }
2180
2181 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2182 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2183 bindings.forEach(env1.info.scope::enter);
2184 return env1;
2185 }
2186
2187 public void visitIf(JCIf tree) {
2188 attribExpr(tree.cond, env, syms.booleanType);
2189
2190 // if (x) { y } [ else z ]
2191 // include x's bindings when true in y
2192 // include x's bindings when false in z
2193
2194 MatchBindings condBindings = matchBindings;
2195 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2196
2197 try {
2198 attribStat(tree.thenpart, thenEnv);
2199 } finally {
2200 thenEnv.info.scope.leave();
2201 }
2202
2203 preFlow(tree.thenpart);
2204 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2205 boolean aliveAfterElse;
2206
2207 if (tree.elsepart != null) {
2208 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2209 try {
2210 attribStat(tree.elsepart, elseEnv);
2211 } finally {
2212 elseEnv.info.scope.leave();
2213 }
2214 preFlow(tree.elsepart);
2215 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2216 } else {
2217 aliveAfterElse = true;
2218 }
2219
2220 chk.checkEmptyIf(tree);
2221
2222 List<BindingSymbol> afterIfBindings = List.nil();
2223
2224 if (aliveAfterThen && !aliveAfterElse) {
2225 afterIfBindings = condBindings.bindingsWhenTrue;
2226 } else if (aliveAfterElse && !aliveAfterThen) {
2227 afterIfBindings = condBindings.bindingsWhenFalse;
2228 }
2229
2230 afterIfBindings.forEach(env.info.scope::enter);
2231 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2232
2233 result = null;
2234 }
2235
2236 void preFlow(JCTree tree) {
2237 attrRecover.doRecovery();
2238 new PostAttrAnalyzer() {
2239 @Override
2240 public void scan(JCTree tree) {
2241 if (tree == null ||
2242 (tree.type != null &&
2243 tree.type == Type.stuckType)) {
2244 //don't touch stuck expressions!
2245 return;
2246 }
2247 super.scan(tree);
2248 }
2249
2250 @Override
2251 public void visitClassDef(JCClassDecl that) {
2252 if (that.sym != null) {
2253 // Method preFlow shouldn't visit class definitions
2254 // that have not been entered and attributed.
2255 // See JDK-8254557 and JDK-8203277 for more details.
2256 super.visitClassDef(that);
2257 }
2258 }
2259
2260 @Override
2261 public void visitLambda(JCLambda that) {
2262 if (that.type != null) {
2263 // Method preFlow shouldn't visit lambda expressions
2264 // that have not been entered and attributed.
2265 // See JDK-8254557 and JDK-8203277 for more details.
2266 super.visitLambda(that);
2267 }
2268 }
2269 }.scan(tree);
2270 }
2271
2272 public void visitExec(JCExpressionStatement tree) {
2273 //a fresh environment is required for 292 inference to work properly ---
2274 //see Infer.instantiatePolymorphicSignatureInstance()
2275 Env<AttrContext> localEnv = env.dup(tree);
2276 attribExpr(tree.expr, localEnv);
2277 result = null;
2278 }
2279
2280 public void visitBreak(JCBreak tree) {
2281 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2282 result = null;
2283 }
2284
2285 public void visitYield(JCYield tree) {
2286 if (env.info.yieldResult != null) {
2287 attribTree(tree.value, env, env.info.yieldResult);
2288 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2289 } else {
2290 log.error(tree.pos(), tree.value.hasTag(PARENS)
2291 ? Errors.NoSwitchExpressionQualify
2292 : Errors.NoSwitchExpression);
2293 attribTree(tree.value, env, unknownExprInfo);
2294 }
2295 result = null;
2296 }
2297
2298 public void visitContinue(JCContinue tree) {
2299 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2300 result = null;
2301 }
2302 //where
2303 /** Return the target of a break, continue or yield statement,
2304 * if it exists, report an error if not.
2305 * Note: The target of a labelled break or continue is the
2306 * (non-labelled) statement tree referred to by the label,
2307 * not the tree representing the labelled statement itself.
2308 *
2309 * @param pos The position to be used for error diagnostics
2310 * @param tag The tag of the jump statement. This is either
2311 * Tree.BREAK or Tree.CONTINUE.
2312 * @param label The label of the jump statement, or null if no
2313 * label is given.
2314 * @param env The environment current at the jump statement.
2315 */
2316 private JCTree findJumpTarget(DiagnosticPosition pos,
2317 JCTree.Tag tag,
2318 Name label,
2319 Env<AttrContext> env) {
2320 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2321
2322 if (jumpTarget.snd != null) {
2323 log.error(pos, jumpTarget.snd);
2324 }
2325
2326 return jumpTarget.fst;
2327 }
2328 /** Return the target of a break or continue statement, if it exists,
2329 * report an error if not.
2330 * Note: The target of a labelled break or continue is the
2331 * (non-labelled) statement tree referred to by the label,
2332 * not the tree representing the labelled statement itself.
2333 *
2334 * @param tag The tag of the jump statement. This is either
2335 * Tree.BREAK or Tree.CONTINUE.
2336 * @param label The label of the jump statement, or null if no
2337 * label is given.
2338 * @param env The environment current at the jump statement.
2339 */
2340 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2341 Name label,
2342 Env<AttrContext> env) {
2343 // Search environments outwards from the point of jump.
2344 Env<AttrContext> env1 = env;
2345 JCDiagnostic.Error pendingError = null;
2346 LOOP:
2347 while (env1 != null) {
2348 switch (env1.tree.getTag()) {
2349 case LABELLED:
2350 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2351 if (label == labelled.label) {
2352 // If jump is a continue, check that target is a loop.
2353 if (tag == CONTINUE) {
2354 if (!labelled.body.hasTag(DOLOOP) &&
2355 !labelled.body.hasTag(WHILELOOP) &&
2356 !labelled.body.hasTag(FORLOOP) &&
2357 !labelled.body.hasTag(FOREACHLOOP)) {
2358 pendingError = Errors.NotLoopLabel(label);
2359 }
2360 // Found labelled statement target, now go inwards
2361 // to next non-labelled tree.
2362 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2363 } else {
2364 return Pair.of(labelled, pendingError);
2365 }
2366 }
2367 break;
2368 case DOLOOP:
2369 case WHILELOOP:
2370 case FORLOOP:
2371 case FOREACHLOOP:
2372 if (label == null) return Pair.of(env1.tree, pendingError);
2373 break;
2374 case SWITCH:
2375 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2376 break;
2377 case SWITCH_EXPRESSION:
2378 if (tag == YIELD) {
2379 return Pair.of(env1.tree, null);
2380 } else if (tag == BREAK) {
2381 pendingError = Errors.BreakOutsideSwitchExpression;
2382 } else {
2383 pendingError = Errors.ContinueOutsideSwitchExpression;
2384 }
2385 break;
2386 case LAMBDA:
2387 case METHODDEF:
2388 case CLASSDEF:
2389 break LOOP;
2390 default:
2391 }
2392 env1 = env1.next;
2393 }
2394 if (label != null)
2395 return Pair.of(null, Errors.UndefLabel(label));
2396 else if (pendingError != null)
2397 return Pair.of(null, pendingError);
2398 else if (tag == CONTINUE)
2399 return Pair.of(null, Errors.ContOutsideLoop);
2400 else
2401 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2402 }
2403
2404 public void visitReturn(JCReturn tree) {
2405 // Check that there is an enclosing method which is
2406 // nested within than the enclosing class.
2407 if (env.info.returnResult == null) {
2408 log.error(tree.pos(), Errors.RetOutsideMeth);
2409 } else if (env.info.yieldResult != null) {
2410 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2411 } else if (!env.info.isLambda &&
2412 !env.info.isNewClass &&
2413 env.enclMethod != null &&
2414 TreeInfo.isCompactConstructor(env.enclMethod)) {
2415 log.error(env.enclMethod,
2416 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2417 } else {
2418 // Attribute return expression, if it exists, and check that
2419 // it conforms to result type of enclosing method.
2420 if (tree.expr != null) {
2421 if (env.info.returnResult.pt.hasTag(VOID)) {
2422 env.info.returnResult.checkContext.report(tree.expr.pos(),
2423 diags.fragment(Fragments.UnexpectedRetVal));
2424 }
2425 attribTree(tree.expr, env, env.info.returnResult);
2426 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2427 !env.info.returnResult.pt.hasTag(NONE)) {
2428 env.info.returnResult.checkContext.report(tree.pos(),
2429 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2430 }
2431 }
2432 result = null;
2433 }
2434
2435 public void visitThrow(JCThrow tree) {
2436 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
2437 if (allowPoly) {
2438 chk.checkType(tree, owntype, syms.throwableType);
2439 }
2440 result = null;
2441 }
2442
2443 public void visitAssert(JCAssert tree) {
2444 attribExpr(tree.cond, env, syms.booleanType);
2445 if (tree.detail != null) {
2446 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2447 }
2448 result = null;
2449 }
2450
2451 /** Visitor method for method invocations.
2452 * NOTE: The method part of an application will have in its type field
2453 * the return type of the method, not the method's type itself!
2454 */
2455 public void visitApply(JCMethodInvocation tree) {
2456 // The local environment of a method application is
2457 // a new environment nested in the current one.
2458 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2459
2460 // The types of the actual method arguments.
2461 List<Type> argtypes;
2462
2463 // The types of the actual method type arguments.
2464 List<Type> typeargtypes = null;
2465
2466 Name methName = TreeInfo.name(tree.meth);
2467
2468 boolean isConstructorCall =
2469 methName == names._this || methName == names._super;
2470
2471 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2472 if (isConstructorCall) {
2473 // We are seeing a ...this(...) or ...super(...) call.
2474 // Check that this is the first statement in a constructor.
2475 checkFirstConstructorStat(tree, env.enclMethod, true);
2476
2477 // Record the fact
2478 // that this is a constructor call (using isSelfCall).
2479 localEnv.info.isSelfCall = true;
2480
2481 // Attribute arguments, yielding list of argument types.
2482 localEnv.info.constructorArgs = true;
2483 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2484 localEnv.info.constructorArgs = false;
2485 argtypes = argtypesBuf.toList();
2486 typeargtypes = attribTypes(tree.typeargs, localEnv);
2487
2488 // Variable `site' points to the class in which the called
2489 // constructor is defined.
2490 Type site = env.enclClass.sym.type;
2491 if (methName == names._super) {
2492 if (site == syms.objectType) {
2493 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2494 site = types.createErrorType(syms.objectType);
2495 } else {
2496 site = types.supertype(site);
2497 }
2498 }
2499
2500 if (site.hasTag(CLASS)) {
2501 Type encl = site.getEnclosingType();
2502 while (encl != null && encl.hasTag(TYPEVAR))
2503 encl = encl.getUpperBound();
2504 if (encl.hasTag(CLASS)) {
2505 // we are calling a nested class
2506
2507 if (tree.meth.hasTag(SELECT)) {
2508 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2509
2510 // We are seeing a prefixed call, of the form
2511 // <expr>.super(...).
2512 // Check that the prefix expression conforms
2513 // to the outer instance type of the class.
2514 chk.checkRefType(qualifier.pos(),
2515 attribExpr(qualifier, localEnv,
2516 encl));
2517 } else if (methName == names._super) {
2518 // qualifier omitted; check for existence
2519 // of an appropriate implicit qualifier.
2520 rs.resolveImplicitThis(tree.meth.pos(),
2521 localEnv, site, true);
2522 }
2523 } else if (tree.meth.hasTag(SELECT)) {
2524 log.error(tree.meth.pos(),
2525 Errors.IllegalQualNotIcls(site.tsym));
2526 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2527 }
2528
2529 // if we're calling a java.lang.Enum constructor,
2530 // prefix the implicit String and int parameters
2531 if (site.tsym == syms.enumSym)
2532 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2533
2534 // Resolve the called constructor under the assumption
2535 // that we are referring to a superclass instance of the
2536 // current instance (JLS ???).
2537 boolean selectSuperPrev = localEnv.info.selectSuper;
2538 localEnv.info.selectSuper = true;
2539 localEnv.info.pendingResolutionPhase = null;
2540 Symbol sym = rs.resolveConstructor(
2541 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2542 localEnv.info.selectSuper = selectSuperPrev;
2543
2544 // Set method symbol to resolved constructor...
2545 TreeInfo.setSymbol(tree.meth, sym);
2546
2547 // ...and check that it is legal in the current context.
2548 // (this will also set the tree's type)
2549 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2550 checkId(tree.meth, site, sym, localEnv,
2551 new ResultInfo(kind, mpt));
2552 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2553 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2554 }
2555 // Otherwise, `site' is an error type and we do nothing
2556 result = tree.type = syms.voidType;
2557 } else {
2558 // Otherwise, we are seeing a regular method call.
2559 // Attribute the arguments, yielding list of argument types, ...
2560 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2561 argtypes = argtypesBuf.toList();
2562 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2563
2564 // ... and attribute the method using as a prototype a methodtype
2565 // whose formal argument types is exactly the list of actual
2566 // arguments (this will also set the method symbol).
2567 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2568 localEnv.info.pendingResolutionPhase = null;
2569 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2570
2571 // Compute the result type.
2572 Type restype = mtype.getReturnType();
2573 if (restype.hasTag(WILDCARD))
2574 throw new AssertionError(mtype);
2575
2576 Type qualifier = (tree.meth.hasTag(SELECT))
2577 ? ((JCFieldAccess) tree.meth).selected.type
2578 : env.enclClass.sym.type;
2579 Symbol msym = TreeInfo.symbol(tree.meth);
2580 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2581
2582 chk.checkRefTypes(tree.typeargs, typeargtypes);
2583
2584 // Check that value of resulting type is admissible in the
2585 // current context. Also, capture the return type
2586 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2587 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2588 }
2589 chk.validate(tree.typeargs, localEnv);
2590 }
2591 //where
2592 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2593 if (msym != null &&
2594 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2595 methodName == names.getClass &&
2596 argtypes.isEmpty()) {
2597 // as a special case, x.getClass() has type Class<? extends |X|>
2598 return new ClassType(restype.getEnclosingType(),
2599 List.of(new WildcardType(types.erasure(qualifierType),
2600 BoundKind.EXTENDS,
2601 syms.boundClass)),
2602 restype.tsym,
2603 restype.getMetadata());
2604 } else if (msym != null &&
2605 msym.owner == syms.arrayClass &&
2606 methodName == names.clone &&
2607 types.isArray(qualifierType)) {
2608 // as a special case, array.clone() has a result that is
2609 // the same as static type of the array being cloned
2610 return qualifierType;
2611 } else {
2612 return restype;
2613 }
2614 }
2615
2616 /** Check that given application node appears as first statement
2617 * in a constructor call.
2618 * @param tree The application node
2619 * @param enclMethod The enclosing method of the application.
2620 * @param error Should an error be issued?
2621 */
2622 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2623 if (enclMethod != null && enclMethod.name == names.init) {
2624 JCBlock body = enclMethod.body;
2625 if (body.stats.head.hasTag(EXEC) &&
2626 ((JCExpressionStatement) body.stats.head).expr == tree)
2627 return true;
2628 }
2629 if (error) {
2630 log.error(tree.pos(),
2631 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2632 }
2633 return false;
2634 }
2635
2636 /** Obtain a method type with given argument types.
2637 */
2638 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2639 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2640 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2641 }
2642
2643 public void visitNewClass(final JCNewClass tree) {
2644 Type owntype = types.createErrorType(tree.type);
2645
2646 // The local environment of a class creation is
2647 // a new environment nested in the current one.
2648 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2649
2650 // The anonymous inner class definition of the new expression,
2651 // if one is defined by it.
2652 JCClassDecl cdef = tree.def;
2653
2654 // If enclosing class is given, attribute it, and
2655 // complete class name to be fully qualified
2656 JCExpression clazz = tree.clazz; // Class field following new
2657 JCExpression clazzid; // Identifier in class field
2658 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2659 annoclazzid = null;
2660
2661 if (clazz.hasTag(TYPEAPPLY)) {
2662 clazzid = ((JCTypeApply) clazz).clazz;
2663 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2664 annoclazzid = (JCAnnotatedType) clazzid;
2665 clazzid = annoclazzid.underlyingType;
2666 }
2667 } else {
2668 if (clazz.hasTag(ANNOTATED_TYPE)) {
2669 annoclazzid = (JCAnnotatedType) clazz;
2670 clazzid = annoclazzid.underlyingType;
2671 } else {
2672 clazzid = clazz;
2673 }
2674 }
2675
2676 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2677
2678 if (tree.encl != null) {
2679 // We are seeing a qualified new, of the form
2680 // <expr>.new C <...> (...) ...
2681 // In this case, we let clazz stand for the name of the
2682 // allocated class C prefixed with the type of the qualifier
2683 // expression, so that we can
2684 // resolve it with standard techniques later. I.e., if
2685 // <expr> has type T, then <expr>.new C <...> (...)
2686 // yields a clazz T.C.
2687 Type encltype = chk.checkRefType(tree.encl.pos(),
2688 attribExpr(tree.encl, env));
2689 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2690 // from expr to the combined type, or not? Yes, do this.
2691 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2692 ((JCIdent) clazzid).name);
2693
2694 EndPosTable endPosTable = this.env.toplevel.endPositions;
2695 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2696 if (clazz.hasTag(ANNOTATED_TYPE)) {
2697 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2698 List<JCAnnotation> annos = annoType.annotations;
2699
2700 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2701 clazzid1 = make.at(tree.pos).
2702 TypeApply(clazzid1,
2703 ((JCTypeApply) clazz).arguments);
2704 }
2705
2706 clazzid1 = make.at(tree.pos).
2707 AnnotatedType(annos, clazzid1);
2708 } else if (clazz.hasTag(TYPEAPPLY)) {
2709 clazzid1 = make.at(tree.pos).
2710 TypeApply(clazzid1,
2711 ((JCTypeApply) clazz).arguments);
2712 }
2713
2714 clazz = clazzid1;
2715 }
2716
2717 // Attribute clazz expression and store
2718 // symbol + type back into the attributed tree.
2719 Type clazztype;
2720
2721 try {
2722 env.info.isNewClass = true;
2723 clazztype = TreeInfo.isEnumInit(env.tree) ?
2724 attribIdentAsEnumType(env, (JCIdent)clazz) :
2725 attribType(clazz, env);
2726 } finally {
2727 env.info.isNewClass = false;
2728 }
2729
2730 clazztype = chk.checkDiamond(tree, clazztype);
2731 chk.validate(clazz, localEnv);
2732 if (tree.encl != null) {
2733 // We have to work in this case to store
2734 // symbol + type back into the attributed tree.
2735 tree.clazz.type = clazztype;
2736 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2737 clazzid.type = ((JCIdent) clazzid).sym.type;
2738 if (annoclazzid != null) {
2739 annoclazzid.type = clazzid.type;
2740 }
2741 if (!clazztype.isErroneous()) {
2742 if (cdef != null && clazztype.tsym.isInterface()) {
2743 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2744 } else if (clazztype.tsym.isStatic()) {
2745 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2746 }
2747 }
2748 } else if (!clazztype.tsym.isInterface() &&
2749 clazztype.getEnclosingType().hasTag(CLASS)) {
2750 // Check for the existence of an apropos outer instance
2751 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2752 }
2753
2754 // Attribute constructor arguments.
2755 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2756 final KindSelector pkind =
2757 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2758 List<Type> argtypes = argtypesBuf.toList();
2759 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2760
2761 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2762 // Enums may not be instantiated except implicitly
2763 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2764 (!env.tree.hasTag(VARDEF) ||
2765 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2766 ((JCVariableDecl) env.tree).init != tree))
2767 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2768
2769 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2770 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2771 boolean skipNonDiamondPath = false;
2772 // Check that class is not abstract
2773 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2774 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2775 log.error(tree.pos(),
2776 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2777 skipNonDiamondPath = true;
2778 } else if (cdef != null && clazztype.tsym.isInterface()) {
2779 // Check that no constructor arguments are given to
2780 // anonymous classes implementing an interface
2781 if (!argtypes.isEmpty())
2782 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2783
2784 if (!typeargtypes.isEmpty())
2785 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2786
2787 // Error recovery: pretend no arguments were supplied.
2788 argtypes = List.nil();
2789 typeargtypes = List.nil();
2790 skipNonDiamondPath = true;
2791 }
2792 if (TreeInfo.isDiamond(tree)) {
2793 ClassType site = new ClassType(clazztype.getEnclosingType(),
2794 clazztype.tsym.type.getTypeArguments(),
2795 clazztype.tsym,
2796 clazztype.getMetadata());
2797
2798 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2799 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2800 diamondEnv.info.pendingResolutionPhase = null;
2801
2802 //if the type of the instance creation expression is a class type
2803 //apply method resolution inference (JLS 15.12.2.7). The return type
2804 //of the resolved constructor will be a partially instantiated type
2805 Symbol constructor = rs.resolveDiamond(tree.pos(),
2806 diamondEnv,
2807 site,
2808 argtypes,
2809 typeargtypes);
2810 tree.constructor = constructor.baseSymbol();
2811
2812 final TypeSymbol csym = clazztype.tsym;
2813 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2814 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2815 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2816 constructorType = checkId(tree, site,
2817 constructor,
2818 diamondEnv,
2819 diamondResult);
2820
2821 tree.clazz.type = types.createErrorType(clazztype);
2822 if (!constructorType.isErroneous()) {
2823 tree.clazz.type = clazz.type = constructorType.getReturnType();
2824 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2825 }
2826 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2827 }
2828
2829 // Resolve the called constructor under the assumption
2830 // that we are referring to a superclass instance of the
2831 // current instance (JLS ???).
2832 else if (!skipNonDiamondPath) {
2833 //the following code alters some of the fields in the current
2834 //AttrContext - hence, the current context must be dup'ed in
2835 //order to avoid downstream failures
2836 Env<AttrContext> rsEnv = localEnv.dup(tree);
2837 rsEnv.info.selectSuper = cdef != null;
2838 rsEnv.info.pendingResolutionPhase = null;
2839 tree.constructor = rs.resolveConstructor(
2840 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2841 if (cdef == null) { //do not check twice!
2842 tree.constructorType = checkId(tree,
2843 clazztype,
2844 tree.constructor,
2845 rsEnv,
2846 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2847 if (rsEnv.info.lastResolveVarargs())
2848 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2849 }
2850 }
2851
2852 if (cdef != null) {
2853 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2854 return;
2855 }
2856
2857 if (tree.constructor != null && tree.constructor.kind == MTH)
2858 owntype = clazztype;
2859 }
2860 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2861 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2862 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2863 //we need to wait for inference to finish and then replace inference vars in the constructor type
2864 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2865 instantiatedContext -> {
2866 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2867 });
2868 }
2869 chk.validate(tree.typeargs, localEnv);
2870 }
2871
2872 // where
2873 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2874 JCClassDecl cdef, Env<AttrContext> localEnv,
2875 List<Type> argtypes, List<Type> typeargtypes,
2876 KindSelector pkind) {
2877 // We are seeing an anonymous class instance creation.
2878 // In this case, the class instance creation
2879 // expression
2880 //
2881 // E.new <typeargs1>C<typargs2>(args) { ... }
2882 //
2883 // is represented internally as
2884 //
2885 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2886 //
2887 // This expression is then *transformed* as follows:
2888 //
2889 // (1) add an extends or implements clause
2890 // (2) add a constructor.
2891 //
2892 // For instance, if C is a class, and ET is the type of E,
2893 // the expression
2894 //
2895 // E.new <typeargs1>C<typargs2>(args) { ... }
2896 //
2897 // is translated to (where X is a fresh name and typarams is the
2898 // parameter list of the super constructor):
2899 //
2900 // new <typeargs1>X(<*nullchk*>E, args) where
2901 // X extends C<typargs2> {
2902 // <typarams> X(ET e, args) {
2903 // e.<typeargs1>super(args)
2904 // }
2905 // ...
2906 // }
2907 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2908 final boolean isDiamond = TreeInfo.isDiamond(tree);
2909 if (isDiamond
2910 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2911 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2912 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2913 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2914 instantiatedContext -> {
2915 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2916 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2917 ResultInfo prevResult = this.resultInfo;
2918 try {
2919 this.resultInfo = resultInfoForClassDefinition;
2920 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2921 localEnv, argtypes, typeargtypes, pkind);
2922 } finally {
2923 this.resultInfo = prevResult;
2924 }
2925 });
2926 } else {
2927 if (isDiamond && clazztype.hasTag(CLASS)) {
2928 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2929 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2930 // One or more types inferred in the previous steps is non-denotable.
2931 Fragment fragment = Diamond(clazztype.tsym);
2932 log.error(tree.clazz.pos(),
2933 Errors.CantApplyDiamond1(
2934 fragment,
2935 invalidDiamondArgs.size() > 1 ?
2936 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2937 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2938 }
2939 // For <>(){}, inferred types must also be accessible.
2940 for (Type t : clazztype.getTypeArguments()) {
2941 rs.checkAccessibleType(env, t);
2942 }
2943 }
2944
2945 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2946 // false for isInterface call even when the original type is an interface.
2947 boolean implementing = clazztype.tsym.isInterface() ||
2948 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2949 clazztype.getOriginalType().tsym.isInterface();
2950
2951 if (implementing) {
2952 cdef.implementing = List.of(clazz);
2953 } else {
2954 cdef.extending = clazz;
2955 }
2956
2957 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2958 rs.isSerializable(clazztype)) {
2959 localEnv.info.isSerializable = true;
2960 }
2961
2962 attribStat(cdef, localEnv);
2963
2964 List<Type> finalargtypes;
2965 // If an outer instance is given,
2966 // prefix it to the constructor arguments
2967 // and delete it from the new expression
2968 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2969 finalargtypes = argtypes.prepend(tree.encl.type);
2970 } else {
2971 finalargtypes = argtypes;
2972 }
2973
2974 // Reassign clazztype and recompute constructor. As this necessarily involves
2975 // another attribution pass for deferred types in the case of <>, replicate
2976 // them. Original arguments have right decorations already.
2977 if (isDiamond && pkind.contains(KindSelector.POLY)) {
2978 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
2979 }
2980
2981 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
2982 : cdef.sym.type;
2983 Symbol sym = tree.constructor = rs.resolveConstructor(
2984 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
2985 Assert.check(!sym.kind.isResolutionError());
2986 tree.constructor = sym;
2987 tree.constructorType = checkId(tree,
2988 clazztype,
2989 tree.constructor,
2990 localEnv,
2991 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2992 }
2993 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
2994 clazztype : types.createErrorType(tree.type);
2995 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
2996 chk.validate(tree.typeargs, localEnv);
2997 }
2998
2999 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3000 return new Check.NestedCheckContext(checkContext) {
3001 @Override
3002 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3003 enclosingContext.report(clazz.clazz,
3004 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3005 }
3006 };
3007 }
3008
3009 /** Make an attributed null check tree.
3010 */
3011 public JCExpression makeNullCheck(JCExpression arg) {
3012 // optimization: new Outer() can never be null; skip null check
3013 if (arg.getTag() == NEWCLASS)
3014 return arg;
3015 // optimization: X.this is never null; skip null check
3016 Name name = TreeInfo.name(arg);
3017 if (name == names._this || name == names._super) return arg;
3018
3019 JCTree.Tag optag = NULLCHK;
3020 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3021 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3022 tree.type = arg.type;
3023 return tree;
3024 }
3025
3026 public void visitNewArray(JCNewArray tree) {
3027 Type owntype = types.createErrorType(tree.type);
3028 Env<AttrContext> localEnv = env.dup(tree);
3029 Type elemtype;
3030 if (tree.elemtype != null) {
3031 elemtype = attribType(tree.elemtype, localEnv);
3032 chk.validate(tree.elemtype, localEnv);
3033 owntype = elemtype;
3034 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3035 attribExpr(l.head, localEnv, syms.intType);
3036 owntype = new ArrayType(owntype, syms.arrayClass);
3037 }
3038 } else {
3039 // we are seeing an untyped aggregate { ... }
3040 // this is allowed only if the prototype is an array
3041 if (pt().hasTag(ARRAY)) {
3042 elemtype = types.elemtype(pt());
3043 } else {
3044 if (!pt().hasTag(ERROR) &&
3045 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3046 log.error(tree.pos(),
3047 Errors.IllegalInitializerForType(pt()));
3048 }
3049 elemtype = types.createErrorType(pt());
3050 }
3051 }
3052 if (tree.elems != null) {
3053 attribExprs(tree.elems, localEnv, elemtype);
3054 owntype = new ArrayType(elemtype, syms.arrayClass);
3055 }
3056 if (!types.isReifiable(elemtype))
3057 log.error(tree.pos(), Errors.GenericArrayCreation);
3058 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3059 }
3060
3061 /*
3062 * A lambda expression can only be attributed when a target-type is available.
3063 * In addition, if the target-type is that of a functional interface whose
3064 * descriptor contains inference variables in argument position the lambda expression
3065 * is 'stuck' (see DeferredAttr).
3066 */
3067 @Override
3068 public void visitLambda(final JCLambda that) {
3069 boolean wrongContext = false;
3070 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3071 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3072 //lambda only allowed in assignment or method invocation/cast context
3073 log.error(that.pos(), Errors.UnexpectedLambda);
3074 }
3075 resultInfo = recoveryInfo;
3076 wrongContext = true;
3077 }
3078 //create an environment for attribution of the lambda expression
3079 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3080 boolean needsRecovery =
3081 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3082 try {
3083 if (needsRecovery && rs.isSerializable(pt())) {
3084 localEnv.info.isSerializable = true;
3085 localEnv.info.isSerializableLambda = true;
3086 }
3087 List<Type> explicitParamTypes = null;
3088 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3089 //attribute lambda parameters
3090 attribStats(that.params, localEnv);
3091 explicitParamTypes = TreeInfo.types(that.params);
3092 }
3093
3094 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3095 Type currentTarget = targetInfo.target;
3096 Type lambdaType = targetInfo.descriptor;
3097
3098 if (currentTarget.isErroneous()) {
3099 result = that.type = currentTarget;
3100 return;
3101 }
3102
3103 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3104
3105 if (lambdaType.hasTag(FORALL)) {
3106 //lambda expression target desc cannot be a generic method
3107 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3108 kindName(currentTarget.tsym),
3109 currentTarget.tsym);
3110 resultInfo.checkContext.report(that, diags.fragment(msg));
3111 result = that.type = types.createErrorType(pt());
3112 return;
3113 }
3114
3115 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3116 //add param type info in the AST
3117 List<Type> actuals = lambdaType.getParameterTypes();
3118 List<JCVariableDecl> params = that.params;
3119
3120 boolean arityMismatch = false;
3121
3122 while (params.nonEmpty()) {
3123 if (actuals.isEmpty()) {
3124 //not enough actuals to perform lambda parameter inference
3125 arityMismatch = true;
3126 }
3127 //reset previously set info
3128 Type argType = arityMismatch ?
3129 syms.errType :
3130 actuals.head;
3131 if (params.head.isImplicitlyTyped()) {
3132 setSyntheticVariableType(params.head, argType);
3133 }
3134 params.head.sym = null;
3135 actuals = actuals.isEmpty() ?
3136 actuals :
3137 actuals.tail;
3138 params = params.tail;
3139 }
3140
3141 //attribute lambda parameters
3142 attribStats(that.params, localEnv);
3143
3144 if (arityMismatch) {
3145 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3146 result = that.type = types.createErrorType(currentTarget);
3147 return;
3148 }
3149 }
3150
3151 //from this point on, no recovery is needed; if we are in assignment context
3152 //we will be able to attribute the whole lambda body, regardless of errors;
3153 //if we are in a 'check' method context, and the lambda is not compatible
3154 //with the target-type, it will be recovered anyway in Attr.checkId
3155 needsRecovery = false;
3156
3157 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3158 lambdaBodyResult(that, lambdaType, resultInfo);
3159
3160 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3161 attribTree(that.getBody(), localEnv, bodyResultInfo);
3162 } else {
3163 JCBlock body = (JCBlock)that.body;
3164 if (body == breakTree &&
3165 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3166 breakTreeFound(copyEnv(localEnv));
3167 }
3168 attribStats(body.stats, localEnv);
3169 }
3170
3171 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3172
3173 boolean isSpeculativeRound =
3174 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3175
3176 preFlow(that);
3177 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3178
3179 that.type = currentTarget; //avoids recovery at this stage
3180 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3181
3182 if (!isSpeculativeRound) {
3183 //add thrown types as bounds to the thrown types free variables if needed:
3184 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3185 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3186 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3187 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3188 }
3189 }
3190
3191 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3192 }
3193 result = wrongContext ? that.type = types.createErrorType(pt())
3194 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3195 } catch (Types.FunctionDescriptorLookupError ex) {
3196 JCDiagnostic cause = ex.getDiagnostic();
3197 resultInfo.checkContext.report(that, cause);
3198 result = that.type = types.createErrorType(pt());
3199 return;
3200 } catch (CompletionFailure cf) {
3201 chk.completionError(that.pos(), cf);
3202 } catch (Throwable t) {
3203 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3204 //as that would likely cause the same exception again.
3205 needsRecovery = false;
3206 throw t;
3207 } finally {
3208 localEnv.info.scope.leave();
3209 if (needsRecovery) {
3210 Type prevResult = result;
3211 try {
3212 attribTree(that, env, recoveryInfo);
3213 } finally {
3214 if (result == Type.recoveryType) {
3215 result = prevResult;
3216 }
3217 }
3218 }
3219 }
3220 }
3221 //where
3222 class TargetInfo {
3223 Type target;
3224 Type descriptor;
3225
3226 public TargetInfo(Type target, Type descriptor) {
3227 this.target = target;
3228 this.descriptor = descriptor;
3229 }
3230 }
3231
3232 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3233 Type lambdaType;
3234 Type currentTarget = resultInfo.pt;
3235 if (resultInfo.pt != Type.recoveryType) {
3236 /* We need to adjust the target. If the target is an
3237 * intersection type, for example: SAM & I1 & I2 ...
3238 * the target will be updated to SAM
3239 */
3240 currentTarget = targetChecker.visit(currentTarget, that);
3241 if (!currentTarget.isIntersection()) {
3242 if (explicitParamTypes != null) {
3243 currentTarget = infer.instantiateFunctionalInterface(that,
3244 currentTarget, explicitParamTypes, resultInfo.checkContext);
3245 }
3246 currentTarget = types.removeWildcards(currentTarget);
3247 lambdaType = types.findDescriptorType(currentTarget);
3248 } else {
3249 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3250 ListBuffer<Type> components = new ListBuffer<>();
3251 for (Type bound : ict.getExplicitComponents()) {
3252 if (explicitParamTypes != null) {
3253 try {
3254 bound = infer.instantiateFunctionalInterface(that,
3255 bound, explicitParamTypes, resultInfo.checkContext);
3256 } catch (FunctionDescriptorLookupError t) {
3257 // do nothing
3258 }
3259 }
3260 bound = types.removeWildcards(bound);
3261 components.add(bound);
3262 }
3263 currentTarget = types.makeIntersectionType(components.toList());
3264 currentTarget.tsym.flags_field |= INTERFACE;
3265 lambdaType = types.findDescriptorType(currentTarget);
3266 }
3267
3268 } else {
3269 currentTarget = Type.recoveryType;
3270 lambdaType = fallbackDescriptorType(that);
3271 }
3272 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3273 //lambda expression target desc cannot be a generic method
3274 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3275 kindName(currentTarget.tsym),
3276 currentTarget.tsym);
3277 resultInfo.checkContext.report(that, diags.fragment(msg));
3278 currentTarget = types.createErrorType(pt());
3279 }
3280 return new TargetInfo(currentTarget, lambdaType);
3281 }
3282
3283 void preFlow(JCLambda tree) {
3284 attrRecover.doRecovery();
3285 new PostAttrAnalyzer() {
3286 @Override
3287 public void scan(JCTree tree) {
3288 if (tree == null ||
3289 (tree.type != null &&
3290 tree.type == Type.stuckType)) {
3291 //don't touch stuck expressions!
3292 return;
3293 }
3294 super.scan(tree);
3295 }
3296
3297 @Override
3298 public void visitClassDef(JCClassDecl that) {
3299 // or class declaration trees!
3300 }
3301
3302 public void visitLambda(JCLambda that) {
3303 // or lambda expressions!
3304 }
3305 }.scan(tree.body);
3306 }
3307
3308 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3309
3310 @Override
3311 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3312 return t.isIntersection() ?
3313 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3314 }
3315
3316 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3317 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3318 return ict;
3319 }
3320
3321 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3322 ListBuffer<Type> targs = new ListBuffer<>();
3323 ListBuffer<Type> supertypes = new ListBuffer<>();
3324 for (Type i : ict.interfaces_field) {
3325 if (i.isParameterized()) {
3326 targs.appendList(i.tsym.type.allparams());
3327 }
3328 supertypes.append(i.tsym.type);
3329 }
3330 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3331 notionalIntf.allparams_field = targs.toList();
3332 notionalIntf.tsym.flags_field |= INTERFACE;
3333 return notionalIntf.tsym;
3334 }
3335 };
3336
3337 private Type fallbackDescriptorType(JCExpression tree) {
3338 switch (tree.getTag()) {
3339 case LAMBDA:
3340 JCLambda lambda = (JCLambda)tree;
3341 List<Type> argtypes = List.nil();
3342 for (JCVariableDecl param : lambda.params) {
3343 argtypes = param.vartype != null && param.vartype.type != null ?
3344 argtypes.append(param.vartype.type) :
3345 argtypes.append(syms.errType);
3346 }
3347 return new MethodType(argtypes, Type.recoveryType,
3348 List.of(syms.throwableType), syms.methodClass);
3349 case REFERENCE:
3350 return new MethodType(List.nil(), Type.recoveryType,
3351 List.of(syms.throwableType), syms.methodClass);
3352 default:
3353 Assert.error("Cannot get here!");
3354 }
3355 return null;
3356 }
3357
3358 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3359 final InferenceContext inferenceContext, final Type... ts) {
3360 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3361 }
3362
3363 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3364 final InferenceContext inferenceContext, final List<Type> ts) {
3365 if (inferenceContext.free(ts)) {
3366 inferenceContext.addFreeTypeListener(ts,
3367 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3368 } else {
3369 for (Type t : ts) {
3370 rs.checkAccessibleType(env, t);
3371 }
3372 }
3373 }
3374
3375 /**
3376 * Lambda/method reference have a special check context that ensures
3377 * that i.e. a lambda return type is compatible with the expected
3378 * type according to both the inherited context and the assignment
3379 * context.
3380 */
3381 class FunctionalReturnContext extends Check.NestedCheckContext {
3382
3383 FunctionalReturnContext(CheckContext enclosingContext) {
3384 super(enclosingContext);
3385 }
3386
3387 @Override
3388 public boolean compatible(Type found, Type req, Warner warn) {
3389 //return type must be compatible in both current context and assignment context
3390 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3391 }
3392
3393 @Override
3394 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3395 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3396 }
3397 }
3398
3399 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3400
3401 JCExpression expr;
3402 boolean expStmtExpected;
3403
3404 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3405 super(enclosingContext);
3406 this.expr = expr;
3407 }
3408
3409 @Override
3410 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3411 if (expStmtExpected) {
3412 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3413 } else {
3414 super.report(pos, details);
3415 }
3416 }
3417
3418 @Override
3419 public boolean compatible(Type found, Type req, Warner warn) {
3420 //a void return is compatible with an expression statement lambda
3421 if (req.hasTag(VOID)) {
3422 expStmtExpected = true;
3423 return TreeInfo.isExpressionStatement(expr);
3424 } else {
3425 return super.compatible(found, req, warn);
3426 }
3427 }
3428 }
3429
3430 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3431 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3432 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3433 new FunctionalReturnContext(resultInfo.checkContext);
3434
3435 return descriptor.getReturnType() == Type.recoveryType ?
3436 recoveryInfo :
3437 new ResultInfo(KindSelector.VAL,
3438 descriptor.getReturnType(), funcContext);
3439 }
3440
3441 /**
3442 * Lambda compatibility. Check that given return types, thrown types, parameter types
3443 * are compatible with the expected functional interface descriptor. This means that:
3444 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3445 * types must be compatible with the return type of the expected descriptor.
3446 */
3447 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3448 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3449
3450 //return values have already been checked - but if lambda has no return
3451 //values, we must ensure that void/value compatibility is correct;
3452 //this amounts at checking that, if a lambda body can complete normally,
3453 //the descriptor's return type must be void
3454 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3455 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3456 Fragment msg =
3457 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3458 checkContext.report(tree,
3459 diags.fragment(msg));
3460 }
3461
3462 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3463 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3464 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3465 }
3466 }
3467
3468 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3469 * static field and that lambda has type annotations, these annotations will
3470 * also be stored at these fake clinit methods.
3471 *
3472 * LambdaToMethod also use fake clinit methods so they can be reused.
3473 * Also as LTM is a phase subsequent to attribution, the methods from
3474 * clinits can be safely removed by LTM to save memory.
3475 */
3476 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3477
3478 public MethodSymbol removeClinit(ClassSymbol sym) {
3479 return clinits.remove(sym);
3480 }
3481
3482 /* This method returns an environment to be used to attribute a lambda
3483 * expression.
3484 *
3485 * The owner of this environment is a method symbol. If the current owner
3486 * is not a method, for example if the lambda is used to initialize
3487 * a field, then if the field is:
3488 *
3489 * - an instance field, we use the first constructor.
3490 * - a static field, we create a fake clinit method.
3491 */
3492 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3493 Env<AttrContext> lambdaEnv;
3494 Symbol owner = env.info.scope.owner;
3495 if (owner.kind == VAR && owner.owner.kind == TYP) {
3496 //field initializer
3497 ClassSymbol enclClass = owner.enclClass();
3498 Symbol newScopeOwner = env.info.scope.owner;
3499 /* if the field isn't static, then we can get the first constructor
3500 * and use it as the owner of the environment. This is what
3501 * LTM code is doing to look for type annotations so we are fine.
3502 */
3503 if ((owner.flags() & STATIC) == 0) {
3504 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3505 newScopeOwner = s;
3506 break;
3507 }
3508 } else {
3509 /* if the field is static then we need to create a fake clinit
3510 * method, this method can later be reused by LTM.
3511 */
3512 MethodSymbol clinit = clinits.get(enclClass);
3513 if (clinit == null) {
3514 Type clinitType = new MethodType(List.nil(),
3515 syms.voidType, List.nil(), syms.methodClass);
3516 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3517 names.clinit, clinitType, enclClass);
3518 clinit.params = List.nil();
3519 clinits.put(enclClass, clinit);
3520 }
3521 newScopeOwner = clinit;
3522 }
3523 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3524 } else {
3525 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3526 }
3527 lambdaEnv.info.yieldResult = null;
3528 lambdaEnv.info.isLambda = true;
3529 return lambdaEnv;
3530 }
3531
3532 @Override
3533 public void visitReference(final JCMemberReference that) {
3534 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3535 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3536 //method reference only allowed in assignment or method invocation/cast context
3537 log.error(that.pos(), Errors.UnexpectedMref);
3538 }
3539 result = that.type = types.createErrorType(pt());
3540 return;
3541 }
3542 final Env<AttrContext> localEnv = env.dup(that);
3543 try {
3544 //attribute member reference qualifier - if this is a constructor
3545 //reference, the expected kind must be a type
3546 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3547
3548 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3549 exprType = chk.checkConstructorRefType(that.expr, exprType);
3550 if (!exprType.isErroneous() &&
3551 exprType.isRaw() &&
3552 that.typeargs != null) {
3553 log.error(that.expr.pos(),
3554 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3555 Fragments.MrefInferAndExplicitParams));
3556 exprType = types.createErrorType(exprType);
3557 }
3558 }
3559
3560 if (exprType.isErroneous()) {
3561 //if the qualifier expression contains problems,
3562 //give up attribution of method reference
3563 result = that.type = exprType;
3564 return;
3565 }
3566
3567 if (TreeInfo.isStaticSelector(that.expr, names)) {
3568 //if the qualifier is a type, validate it; raw warning check is
3569 //omitted as we don't know at this stage as to whether this is a
3570 //raw selector (because of inference)
3571 chk.validate(that.expr, env, false);
3572 } else {
3573 Symbol lhsSym = TreeInfo.symbol(that.expr);
3574 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3575 }
3576 //attrib type-arguments
3577 List<Type> typeargtypes = List.nil();
3578 if (that.typeargs != null) {
3579 typeargtypes = attribTypes(that.typeargs, localEnv);
3580 }
3581
3582 boolean isTargetSerializable =
3583 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3584 rs.isSerializable(pt());
3585 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3586 Type currentTarget = targetInfo.target;
3587 Type desc = targetInfo.descriptor;
3588
3589 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3590 List<Type> argtypes = desc.getParameterTypes();
3591 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3592
3593 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3594 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3595 }
3596
3597 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3598 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3599 try {
3600 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3601 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3602 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3603 } finally {
3604 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3605 }
3606
3607 Symbol refSym = refResult.fst;
3608 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3609
3610 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3611 * JDK-8075541
3612 */
3613 if (refSym.kind != MTH) {
3614 boolean targetError;
3615 switch (refSym.kind) {
3616 case ABSENT_MTH:
3617 case MISSING_ENCL:
3618 targetError = false;
3619 break;
3620 case WRONG_MTH:
3621 case WRONG_MTHS:
3622 case AMBIGUOUS:
3623 case HIDDEN:
3624 case STATICERR:
3625 targetError = true;
3626 break;
3627 default:
3628 Assert.error("unexpected result kind " + refSym.kind);
3629 targetError = false;
3630 }
3631
3632 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3633 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3634 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3635
3636 JCDiagnostic diag = diags.create(log.currentSource(), that,
3637 targetError ?
3638 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3639 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3640
3641 if (targetError && currentTarget == Type.recoveryType) {
3642 //a target error doesn't make sense during recovery stage
3643 //as we don't know what actual parameter types are
3644 result = that.type = currentTarget;
3645 return;
3646 } else {
3647 if (targetError) {
3648 resultInfo.checkContext.report(that, diag);
3649 } else {
3650 log.report(diag);
3651 }
3652 result = that.type = types.createErrorType(currentTarget);
3653 return;
3654 }
3655 }
3656
3657 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3658 that.kind = lookupHelper.referenceKind(that.sym);
3659 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3660
3661 if (desc.getReturnType() == Type.recoveryType) {
3662 // stop here
3663 result = that.type = currentTarget;
3664 return;
3665 }
3666
3667 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3668 Type enclosingType = exprType.getEnclosingType();
3669 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3670 // Check for the existence of an appropriate outer instance
3671 rs.resolveImplicitThis(that.pos(), env, exprType);
3672 }
3673 }
3674
3675 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3676
3677 if (that.getMode() == ReferenceMode.INVOKE &&
3678 TreeInfo.isStaticSelector(that.expr, names) &&
3679 that.kind.isUnbound() &&
3680 lookupHelper.site.isRaw()) {
3681 chk.checkRaw(that.expr, localEnv);
3682 }
3683
3684 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3685 exprType.getTypeArguments().nonEmpty()) {
3686 //static ref with class type-args
3687 log.error(that.expr.pos(),
3688 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3689 Fragments.StaticMrefWithTargs));
3690 result = that.type = types.createErrorType(currentTarget);
3691 return;
3692 }
3693
3694 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3695 // Check that super-qualified symbols are not abstract (JLS)
3696 rs.checkNonAbstract(that.pos(), that.sym);
3697 }
3698
3699 if (isTargetSerializable) {
3700 chk.checkAccessFromSerializableElement(that, true);
3701 }
3702 }
3703
3704 ResultInfo checkInfo =
3705 resultInfo.dup(newMethodTemplate(
3706 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3707 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3708 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3709
3710 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3711
3712 if (that.kind.isUnbound() &&
3713 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3714 //re-generate inference constraints for unbound receiver
3715 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3716 //cannot happen as this has already been checked - we just need
3717 //to regenerate the inference constraints, as that has been lost
3718 //as a result of the call to inferenceContext.save()
3719 Assert.error("Can't get here");
3720 }
3721 }
3722
3723 if (!refType.isErroneous()) {
3724 refType = types.createMethodTypeWithReturn(refType,
3725 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3726 }
3727
3728 //go ahead with standard method reference compatibility check - note that param check
3729 //is a no-op (as this has been taken care during method applicability)
3730 boolean isSpeculativeRound =
3731 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3732
3733 that.type = currentTarget; //avoids recovery at this stage
3734 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3735 if (!isSpeculativeRound) {
3736 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3737 }
3738 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3739 } catch (Types.FunctionDescriptorLookupError ex) {
3740 JCDiagnostic cause = ex.getDiagnostic();
3741 resultInfo.checkContext.report(that, cause);
3742 result = that.type = types.createErrorType(pt());
3743 return;
3744 }
3745 }
3746 //where
3747 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3748 //if this is a constructor reference, the expected kind must be a type
3749 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3750 KindSelector.VAL_TYP : KindSelector.TYP,
3751 Type.noType);
3752 }
3753
3754
3755 @SuppressWarnings("fallthrough")
3756 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3757 InferenceContext inferenceContext = checkContext.inferenceContext();
3758 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3759
3760 Type resType;
3761 switch (tree.getMode()) {
3762 case NEW:
3763 if (!tree.expr.type.isRaw()) {
3764 resType = tree.expr.type;
3765 break;
3766 }
3767 default:
3768 resType = refType.getReturnType();
3769 }
3770
3771 Type incompatibleReturnType = resType;
3772
3773 if (returnType.hasTag(VOID)) {
3774 incompatibleReturnType = null;
3775 }
3776
3777 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3778 if (resType.isErroneous() ||
3779 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3780 checkContext.checkWarner(tree, resType, returnType))) {
3781 incompatibleReturnType = null;
3782 }
3783 }
3784
3785 if (incompatibleReturnType != null) {
3786 Fragment msg =
3787 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3788 checkContext.report(tree, diags.fragment(msg));
3789 } else {
3790 if (inferenceContext.free(refType)) {
3791 // we need to wait for inference to finish and then replace inference vars in the referent type
3792 inferenceContext.addFreeTypeListener(List.of(refType),
3793 instantiatedContext -> {
3794 tree.referentType = instantiatedContext.asInstType(refType);
3795 });
3796 } else {
3797 tree.referentType = refType;
3798 }
3799 }
3800
3801 if (!speculativeAttr) {
3802 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3803 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3804 }
3805 }
3806 }
3807
3808 boolean checkExConstraints(
3809 List<Type> thrownByFuncExpr,
3810 List<Type> thrownAtFuncType,
3811 InferenceContext inferenceContext) {
3812 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3813 * are not proper types
3814 */
3815 List<Type> nonProperList = thrownAtFuncType.stream()
3816 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3817 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3818
3819 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3820 * in the throws clause of the invocation type of the method reference's compile-time
3821 * declaration
3822 */
3823 List<Type> checkedList = thrownByFuncExpr.stream()
3824 .filter(e -> chk.isChecked(e)).collect(List.collector());
3825
3826 /** If n = 0 (the function type's throws clause consists only of proper types), then
3827 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3828 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3829 * reduces to true
3830 */
3831 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3832 for (Type checked : checkedList) {
3833 boolean isSubtype = false;
3834 for (Type proper : properList) {
3835 if (types.isSubtype(checked, proper)) {
3836 isSubtype = true;
3837 break;
3838 }
3839 }
3840 if (!isSubtype) {
3841 uncaughtByProperTypes.add(checked);
3842 }
3843 }
3844
3845 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3846 return false;
3847 }
3848
3849 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3850 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3851 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3852 */
3853 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3854 uncaughtByProperTypes.forEach(checkedEx -> {
3855 nonProperAsUndet.forEach(nonProper -> {
3856 types.isSubtype(checkedEx, nonProper);
3857 });
3858 });
3859
3860 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3861 */
3862 nonProperAsUndet.stream()
3863 .filter(t -> t.hasTag(UNDETVAR))
3864 .forEach(t -> ((UndetVar)t).setThrow());
3865 return true;
3866 }
3867
3868 /**
3869 * Set functional type info on the underlying AST. Note: as the target descriptor
3870 * might contain inference variables, we might need to register an hook in the
3871 * current inference context.
3872 */
3873 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3874 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3875 if (checkContext.inferenceContext().free(descriptorType)) {
3876 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3877 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3878 inferenceContext.asInstType(primaryTarget), checkContext));
3879 } else {
3880 if (pt.hasTag(CLASS)) {
3881 fExpr.target = primaryTarget;
3882 }
3883 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3884 pt != Type.recoveryType) {
3885 //check that functional interface class is well-formed
3886 try {
3887 /* Types.makeFunctionalInterfaceClass() may throw an exception
3888 * when it's executed post-inference. See the listener code
3889 * above.
3890 */
3891 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3892 names.empty, fExpr.target, ABSTRACT);
3893 if (csym != null) {
3894 chk.checkImplementations(env.tree, csym, csym);
3895 try {
3896 //perform an additional functional interface check on the synthetic class,
3897 //as there may be spurious errors for raw targets - because of existing issues
3898 //with membership and inheritance (see JDK-8074570).
3899 csym.flags_field |= INTERFACE;
3900 types.findDescriptorType(csym.type);
3901 } catch (FunctionDescriptorLookupError err) {
3902 resultInfo.checkContext.report(fExpr,
3903 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3904 }
3905 }
3906 } catch (Types.FunctionDescriptorLookupError ex) {
3907 JCDiagnostic cause = ex.getDiagnostic();
3908 resultInfo.checkContext.report(env.tree, cause);
3909 }
3910 }
3911 }
3912 }
3913
3914 public void visitParens(JCParens tree) {
3915 Type owntype = attribTree(tree.expr, env, resultInfo);
3916 result = check(tree, owntype, pkind(), resultInfo);
3917 Symbol sym = TreeInfo.symbol(tree);
3918 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3919 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3920 }
3921
3922 public void visitAssign(JCAssign tree) {
3923 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3924 Type capturedType = capture(owntype);
3925 attribExpr(tree.rhs, env, owntype);
3926 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3927 }
3928
3929 public void visitAssignop(JCAssignOp tree) {
3930 // Attribute arguments.
3931 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3932 Type operand = attribExpr(tree.rhs, env);
3933 // Find operator.
3934 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3935 if (operator != operators.noOpSymbol &&
3936 !owntype.isErroneous() &&
3937 !operand.isErroneous()) {
3938 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3939 chk.checkCastable(tree.rhs.pos(),
3940 operator.type.getReturnType(),
3941 owntype);
3942 }
3943 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3944 }
3945
3946 public void visitUnary(JCUnary tree) {
3947 // Attribute arguments.
3948 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3949 ? attribTree(tree.arg, env, varAssignmentInfo)
3950 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3951
3952 // Find operator.
3953 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3954 Type owntype = types.createErrorType(tree.type);
3955 if (operator != operators.noOpSymbol &&
3956 !argtype.isErroneous()) {
3957 owntype = (tree.getTag().isIncOrDecUnaryOp())
3958 ? tree.arg.type
3959 : operator.type.getReturnType();
3960 int opc = ((OperatorSymbol)operator).opcode;
3961
3962 // If the argument is constant, fold it.
3963 if (argtype.constValue() != null) {
3964 Type ctype = cfolder.fold1(opc, argtype);
3965 if (ctype != null) {
3966 owntype = cfolder.coerce(ctype, owntype);
3967 }
3968 }
3969 }
3970 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3971 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
3972 }
3973
3974 public void visitBinary(JCBinary tree) {
3975 // Attribute arguments.
3976 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3977 // x && y
3978 // include x's bindings when true in y
3979
3980 // x || y
3981 // include x's bindings when false in y
3982
3983 MatchBindings lhsBindings = matchBindings;
3984 List<BindingSymbol> propagatedBindings;
3985 switch (tree.getTag()) {
3986 case AND:
3987 propagatedBindings = lhsBindings.bindingsWhenTrue;
3988 break;
3989 case OR:
3990 propagatedBindings = lhsBindings.bindingsWhenFalse;
3991 break;
3992 default:
3993 propagatedBindings = List.nil();
3994 break;
3995 }
3996 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
3997 Type right;
3998 try {
3999 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4000 } finally {
4001 rhsEnv.info.scope.leave();
4002 }
4003
4004 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4005
4006 // Find operator.
4007 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4008 Type owntype = types.createErrorType(tree.type);
4009 if (operator != operators.noOpSymbol &&
4010 !left.isErroneous() &&
4011 !right.isErroneous()) {
4012 owntype = operator.type.getReturnType();
4013 int opc = ((OperatorSymbol)operator).opcode;
4014 // If both arguments are constants, fold them.
4015 if (left.constValue() != null && right.constValue() != null) {
4016 Type ctype = cfolder.fold2(opc, left, right);
4017 if (ctype != null) {
4018 owntype = cfolder.coerce(ctype, owntype);
4019 }
4020 }
4021
4022 // Check that argument types of a reference ==, != are
4023 // castable to each other, (JLS 15.21). Note: unboxing
4024 // comparisons will not have an acmp* opc at this point.
4025 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4026 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4027 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4028 }
4029 }
4030
4031 chk.checkDivZero(tree.rhs.pos(), operator, right);
4032 }
4033 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4034 }
4035
4036 public void visitTypeCast(final JCTypeCast tree) {
4037 Type clazztype = attribType(tree.clazz, env);
4038 chk.validate(tree.clazz, env, false);
4039 //a fresh environment is required for 292 inference to work properly ---
4040 //see Infer.instantiatePolymorphicSignatureInstance()
4041 Env<AttrContext> localEnv = env.dup(tree);
4042 //should we propagate the target type?
4043 final ResultInfo castInfo;
4044 JCExpression expr = TreeInfo.skipParens(tree.expr);
4045 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4046 if (isPoly) {
4047 //expression is a poly - we need to propagate target type info
4048 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4049 new Check.NestedCheckContext(resultInfo.checkContext) {
4050 @Override
4051 public boolean compatible(Type found, Type req, Warner warn) {
4052 return types.isCastable(found, req, warn);
4053 }
4054 });
4055 } else {
4056 //standalone cast - target-type info is not propagated
4057 castInfo = unknownExprInfo;
4058 }
4059 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4060 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4061 if (exprtype.constValue() != null)
4062 owntype = cfolder.coerce(exprtype, owntype);
4063 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4064 if (!isPoly)
4065 chk.checkRedundantCast(localEnv, tree);
4066 }
4067
4068 public void visitTypeTest(JCInstanceOf tree) {
4069 Type exprtype = chk.checkNullOrRefType(
4070 tree.expr.pos(), attribExpr(tree.expr, env));
4071 Type clazztype;
4072 JCTree typeTree;
4073 if (tree.pattern.getTag() == BINDINGPATTERN ||
4074 tree.pattern.getTag() == PARENTHESIZEDPATTERN) {
4075 attribTree(tree.pattern, env, unknownExprInfo);
4076 clazztype = tree.pattern.type;
4077 if (types.isSubtype(exprtype, clazztype) &&
4078 !exprtype.isErroneous() && !clazztype.isErroneous()) {
4079 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4080 }
4081 typeTree = TreeInfo.primaryPatternTree((JCPattern) tree.pattern).var.vartype;
4082 } else {
4083 clazztype = attribType(tree.pattern, env);
4084 typeTree = tree.pattern;
4085 chk.validate(typeTree, env, false);
4086 }
4087 if (!clazztype.hasTag(TYPEVAR)) {
4088 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4089 }
4090 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4091 boolean valid = false;
4092 if (allowReifiableTypesInInstanceof) {
4093 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4094 } else {
4095 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4096 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4097 allowReifiableTypesInInstanceof = true;
4098 }
4099 if (!valid) {
4100 clazztype = types.createErrorType(clazztype);
4101 }
4102 }
4103 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4104 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4105 }
4106
4107 private boolean checkCastablePattern(DiagnosticPosition pos,
4108 Type exprType,
4109 Type pattType) {
4110 Warner warner = new Warner();
4111 if (!types.isCastable(exprType, pattType, warner)) {
4112 chk.basicHandler.report(pos,
4113 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4114 return false;
4115 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4116 log.error(pos,
4117 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4118 return false;
4119 } else {
4120 return true;
4121 }
4122 }
4123
4124 public void visitBindingPattern(JCBindingPattern tree) {
4125 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
4126 tree.type = tree.var.type = attribTree(tree.var.vartype, env, varInfo);
4127 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, tree.var.vartype.type, env.info.scope.owner);
4128 v.pos = tree.pos;
4129 tree.var.sym = v;
4130 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4131 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4132 }
4133 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4134 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4135 annotate.flush();
4136 chk.validate(tree.var.vartype, env, true);
4137 result = tree.type;
4138 matchBindings = new MatchBindings(List.of(v), List.nil());
4139 }
4140
4141 @Override
4142 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4143 attribExpr(tree.pattern, env);
4144 result = tree.type = tree.pattern.type;
4145 }
4146
4147 @Override
4148 public void visitGuardPattern(JCGuardPattern tree) {
4149 attribExpr(tree.patt, env);
4150 MatchBindings afterPattern = matchBindings;
4151 Env<AttrContext> bodyEnv = bindingEnv(env, matchBindings.bindingsWhenTrue);
4152 try {
4153 attribExpr(tree.expr, bodyEnv, syms.booleanType);
4154 } finally {
4155 bodyEnv.info.scope.leave();
4156 }
4157 result = tree.type = tree.patt.type;
4158 matchBindings = matchBindingsComputer.guardedPattern(tree, afterPattern, matchBindings);
4159 }
4160
4161 public void visitIndexed(JCArrayAccess tree) {
4162 Type owntype = types.createErrorType(tree.type);
4163 Type atype = attribExpr(tree.indexed, env);
4164 attribExpr(tree.index, env, syms.intType);
4165 if (types.isArray(atype))
4166 owntype = types.elemtype(atype);
4167 else if (!atype.hasTag(ERROR))
4168 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4169 if (!pkind().contains(KindSelector.VAL))
4170 owntype = capture(owntype);
4171 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4172 }
4173
4174 public void visitIdent(JCIdent tree) {
4175 Symbol sym;
4176
4177 // Find symbol
4178 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4179 // If we are looking for a method, the prototype `pt' will be a
4180 // method type with the type of the call's arguments as parameters.
4181 env.info.pendingResolutionPhase = null;
4182 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4183 } else if (tree.sym != null && tree.sym.kind != VAR) {
4184 sym = tree.sym;
4185 } else {
4186 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4187 }
4188 tree.sym = sym;
4189
4190 // Also find the environment current for the class where
4191 // sym is defined (`symEnv').
4192 Env<AttrContext> symEnv = env;
4193 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4194 sym.kind.matches(KindSelector.VAL_MTH) &&
4195 sym.owner.kind == TYP &&
4196 tree.name != names._this && tree.name != names._super) {
4197
4198 // Find environment in which identifier is defined.
4199 while (symEnv.outer != null &&
4200 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4201 symEnv = symEnv.outer;
4202 }
4203 }
4204
4205 // If symbol is a variable, ...
4206 if (sym.kind == VAR) {
4207 VarSymbol v = (VarSymbol)sym;
4208
4209 // ..., evaluate its initializer, if it has one, and check for
4210 // illegal forward reference.
4211 checkInit(tree, env, v, false);
4212
4213 // If we are expecting a variable (as opposed to a value), check
4214 // that the variable is assignable in the current environment.
4215 if (KindSelector.ASG.subset(pkind()))
4216 checkAssignable(tree.pos(), v, null, env);
4217 }
4218
4219 // In a constructor body,
4220 // if symbol is a field or instance method, check that it is
4221 // not accessed before the supertype constructor is called.
4222 if (symEnv.info.isSelfCall &&
4223 sym.kind.matches(KindSelector.VAL_MTH) &&
4224 sym.owner.kind == TYP &&
4225 (sym.flags() & STATIC) == 0) {
4226 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4227 sym : thisSym(tree.pos(), env));
4228 }
4229 Env<AttrContext> env1 = env;
4230 if (sym.kind != ERR && sym.kind != TYP &&
4231 sym.owner != null && sym.owner != env1.enclClass.sym) {
4232 // If the found symbol is inaccessible, then it is
4233 // accessed through an enclosing instance. Locate this
4234 // enclosing instance:
4235 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4236 env1 = env1.outer;
4237 }
4238
4239 if (env.info.isSerializable) {
4240 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4241 }
4242
4243 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4244 }
4245
4246 public void visitSelect(JCFieldAccess tree) {
4247 // Determine the expected kind of the qualifier expression.
4248 KindSelector skind = KindSelector.NIL;
4249 if (tree.name == names._this || tree.name == names._super ||
4250 tree.name == names._class)
4251 {
4252 skind = KindSelector.TYP;
4253 } else {
4254 if (pkind().contains(KindSelector.PCK))
4255 skind = KindSelector.of(skind, KindSelector.PCK);
4256 if (pkind().contains(KindSelector.TYP))
4257 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4258 if (pkind().contains(KindSelector.VAL_MTH))
4259 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4260 }
4261
4262 // Attribute the qualifier expression, and determine its symbol (if any).
4263 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4264 if (!pkind().contains(KindSelector.TYP_PCK))
4265 site = capture(site); // Capture field access
4266
4267 // don't allow T.class T[].class, etc
4268 if (skind == KindSelector.TYP) {
4269 Type elt = site;
4270 while (elt.hasTag(ARRAY))
4271 elt = ((ArrayType)elt).elemtype;
4272 if (elt.hasTag(TYPEVAR)) {
4273 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4274 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4275 tree.sym = tree.type.tsym;
4276 return ;
4277 }
4278 }
4279
4280 // If qualifier symbol is a type or `super', assert `selectSuper'
4281 // for the selection. This is relevant for determining whether
4282 // protected symbols are accessible.
4283 Symbol sitesym = TreeInfo.symbol(tree.selected);
4284 boolean selectSuperPrev = env.info.selectSuper;
4285 env.info.selectSuper =
4286 sitesym != null &&
4287 sitesym.name == names._super;
4288
4289 // Determine the symbol represented by the selection.
4290 env.info.pendingResolutionPhase = null;
4291 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4292 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4293 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4294 sym = syms.errSymbol;
4295 }
4296 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4297 site = capture(site);
4298 sym = selectSym(tree, sitesym, site, env, resultInfo);
4299 }
4300 boolean varArgs = env.info.lastResolveVarargs();
4301 tree.sym = sym;
4302
4303 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4304 site = types.skipTypeVars(site, true);
4305 }
4306
4307 // If that symbol is a variable, ...
4308 if (sym.kind == VAR) {
4309 VarSymbol v = (VarSymbol)sym;
4310
4311 // ..., evaluate its initializer, if it has one, and check for
4312 // illegal forward reference.
4313 checkInit(tree, env, v, true);
4314
4315 // If we are expecting a variable (as opposed to a value), check
4316 // that the variable is assignable in the current environment.
4317 if (KindSelector.ASG.subset(pkind()))
4318 checkAssignable(tree.pos(), v, tree.selected, env);
4319 }
4320
4321 if (sitesym != null &&
4322 sitesym.kind == VAR &&
4323 ((VarSymbol)sitesym).isResourceVariable() &&
4324 sym.kind == MTH &&
4325 sym.name.equals(names.close) &&
4326 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4327 env.info.lint.isEnabled(LintCategory.TRY)) {
4328 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4329 }
4330
4331 // Disallow selecting a type from an expression
4332 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4333 tree.type = check(tree.selected, pt(),
4334 sitesym == null ?
4335 KindSelector.VAL : sitesym.kind.toSelector(),
4336 new ResultInfo(KindSelector.TYP_PCK, pt()));
4337 }
4338
4339 if (isType(sitesym)) {
4340 if (sym.name == names._this || sym.name == names._super) {
4341 // If `C' is the currently compiled class, check that
4342 // `C.this' does not appear in an explicit call to a constructor
4343 // also make sure that `super` is not used in constructor invocations
4344 if (env.info.isSelfCall &&
4345 ((sym.name == names._this &&
4346 site.tsym == env.enclClass.sym) ||
4347 sym.name == names._super && env.info.constructorArgs)) {
4348 chk.earlyRefError(tree.pos(), sym);
4349 }
4350 } else {
4351 // Check if type-qualified fields or methods are static (JLS)
4352 if ((sym.flags() & STATIC) == 0 &&
4353 sym.name != names._super &&
4354 (sym.kind == VAR || sym.kind == MTH)) {
4355 rs.accessBase(rs.new StaticError(sym),
4356 tree.pos(), site, sym.name, true);
4357 }
4358 }
4359 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
4360 sym.isStatic() && sym.kind == MTH) {
4361 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
4362 }
4363 } else if (sym.kind != ERR &&
4364 (sym.flags() & STATIC) != 0 &&
4365 sym.name != names._class) {
4366 // If the qualified item is not a type and the selected item is static, report
4367 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4368 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4369 }
4370
4371 // If we are selecting an instance member via a `super', ...
4372 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4373
4374 // Check that super-qualified symbols are not abstract (JLS)
4375 rs.checkNonAbstract(tree.pos(), sym);
4376
4377 if (site.isRaw()) {
4378 // Determine argument types for site.
4379 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4380 if (site1 != null) site = site1;
4381 }
4382 }
4383
4384 if (env.info.isSerializable) {
4385 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4386 }
4387
4388 env.info.selectSuper = selectSuperPrev;
4389 result = checkId(tree, site, sym, env, resultInfo);
4390 }
4391 //where
4392 /** Determine symbol referenced by a Select expression,
4393 *
4394 * @param tree The select tree.
4395 * @param site The type of the selected expression,
4396 * @param env The current environment.
4397 * @param resultInfo The current result.
4398 */
4399 private Symbol selectSym(JCFieldAccess tree,
4400 Symbol location,
4401 Type site,
4402 Env<AttrContext> env,
4403 ResultInfo resultInfo) {
4404 DiagnosticPosition pos = tree.pos();
4405 Name name = tree.name;
4406 switch (site.getTag()) {
4407 case PACKAGE:
4408 return rs.accessBase(
4409 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4410 pos, location, site, name, true);
4411 case ARRAY:
4412 case CLASS:
4413 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4414 return rs.resolveQualifiedMethod(
4415 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4416 } else if (name == names._this || name == names._super) {
4417 return rs.resolveSelf(pos, env, site.tsym, name);
4418 } else if (name == names._class) {
4419 // In this case, we have already made sure in
4420 // visitSelect that qualifier expression is a type.
4421 return syms.getClassField(site, types);
4422 } else {
4423 // We are seeing a plain identifier as selector.
4424 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4425 sym = rs.accessBase(sym, pos, location, site, name, true);
4426 return sym;
4427 }
4428 case WILDCARD:
4429 throw new AssertionError(tree);
4430 case TYPEVAR:
4431 // Normally, site.getUpperBound() shouldn't be null.
4432 // It should only happen during memberEnter/attribBase
4433 // when determining the super type which *must* be
4434 // done before attributing the type variables. In
4435 // other words, we are seeing this illegal program:
4436 // class B<T> extends A<T.foo> {}
4437 Symbol sym = (site.getUpperBound() != null)
4438 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4439 : null;
4440 if (sym == null) {
4441 log.error(pos, Errors.TypeVarCantBeDeref);
4442 return syms.errSymbol;
4443 } else {
4444 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4445 rs.new AccessError(env, site, sym) :
4446 sym;
4447 rs.accessBase(sym2, pos, location, site, name, true);
4448 return sym;
4449 }
4450 case ERROR:
4451 // preserve identifier names through errors
4452 return types.createErrorType(name, site.tsym, site).tsym;
4453 default:
4454 // The qualifier expression is of a primitive type -- only
4455 // .class is allowed for these.
4456 if (name == names._class) {
4457 // In this case, we have already made sure in Select that
4458 // qualifier expression is a type.
4459 return syms.getClassField(site, types);
4460 } else {
4461 log.error(pos, Errors.CantDeref(site));
4462 return syms.errSymbol;
4463 }
4464 }
4465 }
4466
4467 /** Determine type of identifier or select expression and check that
4468 * (1) the referenced symbol is not deprecated
4469 * (2) the symbol's type is safe (@see checkSafe)
4470 * (3) if symbol is a variable, check that its type and kind are
4471 * compatible with the prototype and protokind.
4472 * (4) if symbol is an instance field of a raw type,
4473 * which is being assigned to, issue an unchecked warning if its
4474 * type changes under erasure.
4475 * (5) if symbol is an instance method of a raw type, issue an
4476 * unchecked warning if its argument types change under erasure.
4477 * If checks succeed:
4478 * If symbol is a constant, return its constant type
4479 * else if symbol is a method, return its result type
4480 * otherwise return its type.
4481 * Otherwise return errType.
4482 *
4483 * @param tree The syntax tree representing the identifier
4484 * @param site If this is a select, the type of the selected
4485 * expression, otherwise the type of the current class.
4486 * @param sym The symbol representing the identifier.
4487 * @param env The current environment.
4488 * @param resultInfo The expected result
4489 */
4490 Type checkId(JCTree tree,
4491 Type site,
4492 Symbol sym,
4493 Env<AttrContext> env,
4494 ResultInfo resultInfo) {
4495 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4496 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4497 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4498 }
4499
4500 Type checkMethodIdInternal(JCTree tree,
4501 Type site,
4502 Symbol sym,
4503 Env<AttrContext> env,
4504 ResultInfo resultInfo) {
4505 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4506 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4507 } else {
4508 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4509 }
4510 }
4511
4512 Type checkIdInternal(JCTree tree,
4513 Type site,
4514 Symbol sym,
4515 Type pt,
4516 Env<AttrContext> env,
4517 ResultInfo resultInfo) {
4518 if (pt.isErroneous()) {
4519 return types.createErrorType(site);
4520 }
4521 Type owntype; // The computed type of this identifier occurrence.
4522 switch (sym.kind) {
4523 case TYP:
4524 // For types, the computed type equals the symbol's type,
4525 // except for two situations:
4526 owntype = sym.type;
4527 if (owntype.hasTag(CLASS)) {
4528 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4529 Type ownOuter = owntype.getEnclosingType();
4530
4531 // (a) If the symbol's type is parameterized, erase it
4532 // because no type parameters were given.
4533 // We recover generic outer type later in visitTypeApply.
4534 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4535 owntype = types.erasure(owntype);
4536 }
4537
4538 // (b) If the symbol's type is an inner class, then
4539 // we have to interpret its outer type as a superclass
4540 // of the site type. Example:
4541 //
4542 // class Tree<A> { class Visitor { ... } }
4543 // class PointTree extends Tree<Point> { ... }
4544 // ...PointTree.Visitor...
4545 //
4546 // Then the type of the last expression above is
4547 // Tree<Point>.Visitor.
4548 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4549 Type normOuter = site;
4550 if (normOuter.hasTag(CLASS)) {
4551 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4552 }
4553 if (normOuter == null) // perhaps from an import
4554 normOuter = types.erasure(ownOuter);
4555 if (normOuter != ownOuter)
4556 owntype = new ClassType(
4557 normOuter, List.nil(), owntype.tsym,
4558 owntype.getMetadata());
4559 }
4560 }
4561 break;
4562 case VAR:
4563 VarSymbol v = (VarSymbol)sym;
4564
4565 if (env.info.enclVar != null
4566 && v.type.hasTag(NONE)) {
4567 //self reference to implicitly typed variable declaration
4568 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4569 return v.type = types.createErrorType(v.type);
4570 }
4571
4572 // Test (4): if symbol is an instance field of a raw type,
4573 // which is being assigned to, issue an unchecked warning if
4574 // its type changes under erasure.
4575 if (KindSelector.ASG.subset(pkind()) &&
4576 v.owner.kind == TYP &&
4577 (v.flags() & STATIC) == 0 &&
4578 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4579 Type s = types.asOuterSuper(site, v.owner);
4580 if (s != null &&
4581 s.isRaw() &&
4582 !types.isSameType(v.type, v.erasure(types))) {
4583 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4584 }
4585 }
4586 // The computed type of a variable is the type of the
4587 // variable symbol, taken as a member of the site type.
4588 owntype = (sym.owner.kind == TYP &&
4589 sym.name != names._this && sym.name != names._super)
4590 ? types.memberType(site, sym)
4591 : sym.type;
4592
4593 // If the variable is a constant, record constant value in
4594 // computed type.
4595 if (v.getConstValue() != null && isStaticReference(tree))
4596 owntype = owntype.constType(v.getConstValue());
4597
4598 if (resultInfo.pkind == KindSelector.VAL) {
4599 owntype = capture(owntype); // capture "names as expressions"
4600 }
4601 break;
4602 case MTH: {
4603 owntype = checkMethod(site, sym,
4604 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4605 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4606 resultInfo.pt.getTypeArguments());
4607 break;
4608 }
4609 case PCK: case ERR:
4610 owntype = sym.type;
4611 break;
4612 default:
4613 throw new AssertionError("unexpected kind: " + sym.kind +
4614 " in tree " + tree);
4615 }
4616
4617 // Emit a `deprecation' warning if symbol is deprecated.
4618 // (for constructors (but not for constructor references), the error
4619 // was given when the constructor was resolved)
4620
4621 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4622 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4623 chk.checkSunAPI(tree.pos(), sym);
4624 chk.checkProfile(tree.pos(), sym);
4625 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4626 }
4627
4628 // If symbol is a variable, check that its type and
4629 // kind are compatible with the prototype and protokind.
4630 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4631 }
4632
4633 /** Check that variable is initialized and evaluate the variable's
4634 * initializer, if not yet done. Also check that variable is not
4635 * referenced before it is defined.
4636 * @param tree The tree making up the variable reference.
4637 * @param env The current environment.
4638 * @param v The variable's symbol.
4639 */
4640 private void checkInit(JCTree tree,
4641 Env<AttrContext> env,
4642 VarSymbol v,
4643 boolean onlyWarning) {
4644 // A forward reference is diagnosed if the declaration position
4645 // of the variable is greater than the current tree position
4646 // and the tree and variable definition occur in the same class
4647 // definition. Note that writes don't count as references.
4648 // This check applies only to class and instance
4649 // variables. Local variables follow different scope rules,
4650 // and are subject to definite assignment checking.
4651 Env<AttrContext> initEnv = enclosingInitEnv(env);
4652 if (initEnv != null &&
4653 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4654 v.owner.kind == TYP &&
4655 v.owner == env.info.scope.owner.enclClass() &&
4656 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4657 (!env.tree.hasTag(ASSIGN) ||
4658 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4659 if (!onlyWarning || isStaticEnumField(v)) {
4660 Error errkey = (initEnv.info.enclVar == v) ?
4661 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4662 log.error(tree.pos(), errkey);
4663 } else if (useBeforeDeclarationWarning) {
4664 Warning warnkey = (initEnv.info.enclVar == v) ?
4665 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4666 log.warning(tree.pos(), warnkey);
4667 }
4668 }
4669
4670 v.getConstValue(); // ensure initializer is evaluated
4671
4672 checkEnumInitializer(tree, env, v);
4673 }
4674
4675 /**
4676 * Returns the enclosing init environment associated with this env (if any). An init env
4677 * can be either a field declaration env or a static/instance initializer env.
4678 */
4679 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4680 while (true) {
4681 switch (env.tree.getTag()) {
4682 case VARDEF:
4683 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4684 if (vdecl.sym.owner.kind == TYP) {
4685 //field
4686 return env;
4687 }
4688 break;
4689 case BLOCK:
4690 if (env.next.tree.hasTag(CLASSDEF)) {
4691 //instance/static initializer
4692 return env;
4693 }
4694 break;
4695 case METHODDEF:
4696 case CLASSDEF:
4697 case TOPLEVEL:
4698 return null;
4699 }
4700 Assert.checkNonNull(env.next);
4701 env = env.next;
4702 }
4703 }
4704
4705 /**
4706 * Check for illegal references to static members of enum. In
4707 * an enum type, constructors and initializers may not
4708 * reference its static members unless they are constant.
4709 *
4710 * @param tree The tree making up the variable reference.
4711 * @param env The current environment.
4712 * @param v The variable's symbol.
4713 * @jls 8.9 Enum Types
4714 */
4715 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4716 // JLS:
4717 //
4718 // "It is a compile-time error to reference a static field
4719 // of an enum type that is not a compile-time constant
4720 // (15.28) from constructors, instance initializer blocks,
4721 // or instance variable initializer expressions of that
4722 // type. It is a compile-time error for the constructors,
4723 // instance initializer blocks, or instance variable
4724 // initializer expressions of an enum constant e to refer
4725 // to itself or to an enum constant of the same type that
4726 // is declared to the right of e."
4727 if (isStaticEnumField(v)) {
4728 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4729
4730 if (enclClass == null || enclClass.owner == null)
4731 return;
4732
4733 // See if the enclosing class is the enum (or a
4734 // subclass thereof) declaring v. If not, this
4735 // reference is OK.
4736 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4737 return;
4738
4739 // If the reference isn't from an initializer, then
4740 // the reference is OK.
4741 if (!Resolve.isInitializer(env))
4742 return;
4743
4744 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4745 }
4746 }
4747
4748 /** Is the given symbol a static, non-constant field of an Enum?
4749 * Note: enum literals should not be regarded as such
4750 */
4751 private boolean isStaticEnumField(VarSymbol v) {
4752 return Flags.isEnum(v.owner) &&
4753 Flags.isStatic(v) &&
4754 !Flags.isConstant(v) &&
4755 v.name != names._class;
4756 }
4757
4758 /**
4759 * Check that method arguments conform to its instantiation.
4760 **/
4761 public Type checkMethod(Type site,
4762 final Symbol sym,
4763 ResultInfo resultInfo,
4764 Env<AttrContext> env,
4765 final List<JCExpression> argtrees,
4766 List<Type> argtypes,
4767 List<Type> typeargtypes) {
4768 // Test (5): if symbol is an instance method of a raw type, issue
4769 // an unchecked warning if its argument types change under erasure.
4770 if ((sym.flags() & STATIC) == 0 &&
4771 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4772 Type s = types.asOuterSuper(site, sym.owner);
4773 if (s != null && s.isRaw() &&
4774 !types.isSameTypes(sym.type.getParameterTypes(),
4775 sym.erasure(types).getParameterTypes())) {
4776 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4777 }
4778 }
4779
4780 if (env.info.defaultSuperCallSite != null) {
4781 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4782 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4783 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4784 List<MethodSymbol> icand_sup =
4785 types.interfaceCandidates(sup, (MethodSymbol)sym);
4786 if (icand_sup.nonEmpty() &&
4787 icand_sup.head != sym &&
4788 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4789 log.error(env.tree.pos(),
4790 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4791 break;
4792 }
4793 }
4794 env.info.defaultSuperCallSite = null;
4795 }
4796
4797 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4798 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4799 if (app.meth.hasTag(SELECT) &&
4800 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4801 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4802 }
4803 }
4804
4805 // Compute the identifier's instantiated type.
4806 // For methods, we need to compute the instance type by
4807 // Resolve.instantiate from the symbol's type as well as
4808 // any type arguments and value arguments.
4809 Warner noteWarner = new Warner();
4810 try {
4811 Type owntype = rs.checkMethod(
4812 env,
4813 site,
4814 sym,
4815 resultInfo,
4816 argtypes,
4817 typeargtypes,
4818 noteWarner);
4819
4820 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4821 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4822
4823 argtypes = argtypes.map(checkDeferredMap);
4824
4825 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4826 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4827 sym.name,
4828 rs.methodArguments(sym.type.getParameterTypes()),
4829 rs.methodArguments(argtypes.map(checkDeferredMap)),
4830 kindName(sym.location()),
4831 sym.location()));
4832 if (resultInfo.pt != Infer.anyPoly ||
4833 !owntype.hasTag(METHOD) ||
4834 !owntype.isPartial()) {
4835 //if this is not a partially inferred method type, erase return type. Otherwise,
4836 //erasure is carried out in PartiallyInferredMethodType.check().
4837 owntype = new MethodType(owntype.getParameterTypes(),
4838 types.erasure(owntype.getReturnType()),
4839 types.erasure(owntype.getThrownTypes()),
4840 syms.methodClass);
4841 }
4842 }
4843
4844 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4845 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4846 PolyKind.POLY : PolyKind.STANDALONE;
4847 TreeInfo.setPolyKind(env.tree, pkind);
4848
4849 return (resultInfo.pt == Infer.anyPoly) ?
4850 owntype :
4851 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4852 resultInfo.checkContext.inferenceContext());
4853 } catch (Infer.InferenceException ex) {
4854 //invalid target type - propagate exception outwards or report error
4855 //depending on the current check context
4856 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4857 return types.createErrorType(site);
4858 } catch (Resolve.InapplicableMethodException ex) {
4859 final JCDiagnostic diag = ex.getDiagnostic();
4860 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4861 @Override
4862 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4863 return new Pair<>(sym, diag);
4864 }
4865 };
4866 List<Type> argtypes2 = argtypes.map(
4867 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4868 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4869 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4870 log.report(errDiag);
4871 return types.createErrorType(site);
4872 }
4873 }
4874
4875 public void visitLiteral(JCLiteral tree) {
4876 result = check(tree, litType(tree.typetag).constType(tree.value),
4877 KindSelector.VAL, resultInfo);
4878 }
4879 //where
4880 /** Return the type of a literal with given type tag.
4881 */
4882 Type litType(TypeTag tag) {
4883 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4884 }
4885
4886 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
4887 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
4888 }
4889
4890 public void visitTypeArray(JCArrayTypeTree tree) {
4891 Type etype = attribType(tree.elemtype, env);
4892 Type type = new ArrayType(etype, syms.arrayClass);
4893 result = check(tree, type, KindSelector.TYP, resultInfo);
4894 }
4895
4896 /** Visitor method for parameterized types.
4897 * Bound checking is left until later, since types are attributed
4898 * before supertype structure is completely known
4899 */
4900 public void visitTypeApply(JCTypeApply tree) {
4901 Type owntype = types.createErrorType(tree.type);
4902
4903 // Attribute functor part of application and make sure it's a class.
4904 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
4905
4906 // Attribute type parameters
4907 List<Type> actuals = attribTypes(tree.arguments, env);
4908
4909 if (clazztype.hasTag(CLASS)) {
4910 List<Type> formals = clazztype.tsym.type.getTypeArguments();
4911 if (actuals.isEmpty()) //diamond
4912 actuals = formals;
4913
4914 if (actuals.length() == formals.length()) {
4915 List<Type> a = actuals;
4916 List<Type> f = formals;
4917 while (a.nonEmpty()) {
4918 a.head = a.head.withTypeVar(f.head);
4919 a = a.tail;
4920 f = f.tail;
4921 }
4922 // Compute the proper generic outer
4923 Type clazzOuter = clazztype.getEnclosingType();
4924 if (clazzOuter.hasTag(CLASS)) {
4925 Type site;
4926 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
4927 if (clazz.hasTag(IDENT)) {
4928 site = env.enclClass.sym.type;
4929 } else if (clazz.hasTag(SELECT)) {
4930 site = ((JCFieldAccess) clazz).selected.type;
4931 } else throw new AssertionError(""+tree);
4932 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
4933 if (site.hasTag(CLASS))
4934 site = types.asOuterSuper(site, clazzOuter.tsym);
4935 if (site == null)
4936 site = types.erasure(clazzOuter);
4937 clazzOuter = site;
4938 }
4939 }
4940 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
4941 clazztype.getMetadata());
4942 } else {
4943 if (formals.length() != 0) {
4944 log.error(tree.pos(),
4945 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
4946 } else {
4947 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
4948 }
4949 owntype = types.createErrorType(tree.type);
4950 }
4951 }
4952 result = check(tree, owntype, KindSelector.TYP, resultInfo);
4953 }
4954
4955 public void visitTypeUnion(JCTypeUnion tree) {
4956 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
4957 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
4958 for (JCExpression typeTree : tree.alternatives) {
4959 Type ctype = attribType(typeTree, env);
4960 ctype = chk.checkType(typeTree.pos(),
4961 chk.checkClassType(typeTree.pos(), ctype),
4962 syms.throwableType);
4963 if (!ctype.isErroneous()) {
4964 //check that alternatives of a union type are pairwise
4965 //unrelated w.r.t. subtyping
4966 if (chk.intersects(ctype, multicatchTypes.toList())) {
4967 for (Type t : multicatchTypes) {
4968 boolean sub = types.isSubtype(ctype, t);
4969 boolean sup = types.isSubtype(t, ctype);
4970 if (sub || sup) {
4971 //assume 'a' <: 'b'
4972 Type a = sub ? ctype : t;
4973 Type b = sub ? t : ctype;
4974 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
4975 }
4976 }
4977 }
4978 multicatchTypes.append(ctype);
4979 if (all_multicatchTypes != null)
4980 all_multicatchTypes.append(ctype);
4981 } else {
4982 if (all_multicatchTypes == null) {
4983 all_multicatchTypes = new ListBuffer<>();
4984 all_multicatchTypes.appendList(multicatchTypes);
4985 }
4986 all_multicatchTypes.append(ctype);
4987 }
4988 }
4989 Type t = check(tree, types.lub(multicatchTypes.toList()),
4990 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
4991 if (t.hasTag(CLASS)) {
4992 List<Type> alternatives =
4993 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
4994 t = new UnionClassType((ClassType) t, alternatives);
4995 }
4996 tree.type = result = t;
4997 }
4998
4999 public void visitTypeIntersection(JCTypeIntersection tree) {
5000 attribTypes(tree.bounds, env);
5001 tree.type = result = checkIntersection(tree, tree.bounds);
5002 }
5003
5004 public void visitTypeParameter(JCTypeParameter tree) {
5005 TypeVar typeVar = (TypeVar) tree.type;
5006
5007 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5008 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5009 }
5010
5011 if (!typeVar.getUpperBound().isErroneous()) {
5012 //fixup type-parameter bound computed in 'attribTypeVariables'
5013 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5014 }
5015 }
5016
5017 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5018 Set<Type> boundSet = new HashSet<>();
5019 if (bounds.nonEmpty()) {
5020 // accept class or interface or typevar as first bound.
5021 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5022 boundSet.add(types.erasure(bounds.head.type));
5023 if (bounds.head.type.isErroneous()) {
5024 return bounds.head.type;
5025 }
5026 else if (bounds.head.type.hasTag(TYPEVAR)) {
5027 // if first bound was a typevar, do not accept further bounds.
5028 if (bounds.tail.nonEmpty()) {
5029 log.error(bounds.tail.head.pos(),
5030 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5031 return bounds.head.type;
5032 }
5033 } else {
5034 // if first bound was a class or interface, accept only interfaces
5035 // as further bounds.
5036 for (JCExpression bound : bounds.tail) {
5037 bound.type = checkBase(bound.type, bound, env, false, true, false);
5038 if (bound.type.isErroneous()) {
5039 bounds = List.of(bound);
5040 }
5041 else if (bound.type.hasTag(CLASS)) {
5042 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5043 }
5044 }
5045 }
5046 }
5047
5048 if (bounds.length() == 0) {
5049 return syms.objectType;
5050 } else if (bounds.length() == 1) {
5051 return bounds.head.type;
5052 } else {
5053 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5054 // ... the variable's bound is a class type flagged COMPOUND
5055 // (see comment for TypeVar.bound).
5056 // In this case, generate a class tree that represents the
5057 // bound class, ...
5058 JCExpression extending;
5059 List<JCExpression> implementing;
5060 if (!bounds.head.type.isInterface()) {
5061 extending = bounds.head;
5062 implementing = bounds.tail;
5063 } else {
5064 extending = null;
5065 implementing = bounds;
5066 }
5067 JCClassDecl cd = make.at(tree).ClassDef(
5068 make.Modifiers(PUBLIC | ABSTRACT),
5069 names.empty, List.nil(),
5070 extending, implementing, List.nil());
5071
5072 ClassSymbol c = (ClassSymbol)owntype.tsym;
5073 Assert.check((c.flags() & COMPOUND) != 0);
5074 cd.sym = c;
5075 c.sourcefile = env.toplevel.sourcefile;
5076
5077 // ... and attribute the bound class
5078 c.flags_field |= UNATTRIBUTED;
5079 Env<AttrContext> cenv = enter.classEnv(cd, env);
5080 typeEnvs.put(c, cenv);
5081 attribClass(c);
5082 return owntype;
5083 }
5084 }
5085
5086 public void visitWildcard(JCWildcard tree) {
5087 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5088 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5089 ? syms.objectType
5090 : attribType(tree.inner, env);
5091 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5092 tree.kind.kind,
5093 syms.boundClass),
5094 KindSelector.TYP, resultInfo);
5095 }
5096
5097 public void visitAnnotation(JCAnnotation tree) {
5098 Assert.error("should be handled in annotate");
5099 }
5100
5101 @Override
5102 public void visitModifiers(JCModifiers tree) {
5103 //error recovery only:
5104 Assert.check(resultInfo.pkind == KindSelector.ERR);
5105
5106 attribAnnotationTypes(tree.annotations, env);
5107 }
5108
5109 public void visitAnnotatedType(JCAnnotatedType tree) {
5110 attribAnnotationTypes(tree.annotations, env);
5111 Type underlyingType = attribType(tree.underlyingType, env);
5112 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5113
5114 if (!env.info.isNewClass)
5115 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5116 result = tree.type = annotatedType;
5117 }
5118
5119 public void visitErroneous(JCErroneous tree) {
5120 if (tree.errs != null) {
5121 Env<AttrContext> errEnv = env.dup(env.tree);
5122 errEnv.info.returnResult = unknownExprInfo;
5123 for (JCTree err : tree.errs)
5124 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5125 }
5126 result = tree.type = syms.errType;
5127 }
5128
5129 /** Default visitor method for all other trees.
5130 */
5131 public void visitTree(JCTree tree) {
5132 throw new AssertionError();
5133 }
5134
5135 /**
5136 * Attribute an env for either a top level tree or class or module declaration.
5137 */
5138 public void attrib(Env<AttrContext> env) {
5139 switch (env.tree.getTag()) {
5140 case MODULEDEF:
5141 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5142 break;
5143 case TOPLEVEL:
5144 attribTopLevel(env);
5145 break;
5146 case PACKAGEDEF:
5147 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5148 break;
5149 default:
5150 attribClass(env.tree.pos(), env.enclClass.sym);
5151 }
5152 }
5153
5154 /**
5155 * Attribute a top level tree. These trees are encountered when the
5156 * package declaration has annotations.
5157 */
5158 public void attribTopLevel(Env<AttrContext> env) {
5159 JCCompilationUnit toplevel = env.toplevel;
5160 try {
5161 annotate.flush();
5162 } catch (CompletionFailure ex) {
5163 chk.completionError(toplevel.pos(), ex);
5164 }
5165 }
5166
5167 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5168 try {
5169 annotate.flush();
5170 attribPackage(p);
5171 } catch (CompletionFailure ex) {
5172 chk.completionError(pos, ex);
5173 }
5174 }
5175
5176 void attribPackage(PackageSymbol p) {
5177 Env<AttrContext> env = typeEnvs.get(p);
5178 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
5179 }
5180
5181 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5182 try {
5183 annotate.flush();
5184 attribModule(m);
5185 } catch (CompletionFailure ex) {
5186 chk.completionError(pos, ex);
5187 }
5188 }
5189
5190 void attribModule(ModuleSymbol m) {
5191 // Get environment current at the point of module definition.
5192 Env<AttrContext> env = enter.typeEnvs.get(m);
5193 attribStat(env.tree, env);
5194 }
5195
5196 /** Main method: attribute class definition associated with given class symbol.
5197 * reporting completion failures at the given position.
5198 * @param pos The source position at which completion errors are to be
5199 * reported.
5200 * @param c The class symbol whose definition will be attributed.
5201 */
5202 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5203 try {
5204 annotate.flush();
5205 attribClass(c);
5206 } catch (CompletionFailure ex) {
5207 chk.completionError(pos, ex);
5208 }
5209 }
5210
5211 /** Attribute class definition associated with given class symbol.
5212 * @param c The class symbol whose definition will be attributed.
5213 */
5214 void attribClass(ClassSymbol c) throws CompletionFailure {
5215 if (c.type.hasTag(ERROR)) return;
5216
5217 // Check for cycles in the inheritance graph, which can arise from
5218 // ill-formed class files.
5219 chk.checkNonCyclic(null, c.type);
5220
5221 Type st = types.supertype(c.type);
5222 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5223 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5224 // First, attribute superclass.
5225 if (st.hasTag(CLASS))
5226 attribClass((ClassSymbol)st.tsym);
5227
5228 // Next attribute owner, if it is a class.
5229 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5230 attribClass((ClassSymbol)c.owner);
5231
5232 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5233 }
5234
5235 // The previous operations might have attributed the current class
5236 // if there was a cycle. So we test first whether the class is still
5237 // UNATTRIBUTED.
5238 if ((c.flags_field & UNATTRIBUTED) != 0) {
5239 c.flags_field &= ~UNATTRIBUTED;
5240
5241 // Get environment current at the point of class definition.
5242 Env<AttrContext> env = typeEnvs.get(c);
5243
5244 if (c.isSealed() &&
5245 !c.isEnum() &&
5246 !c.isPermittedExplicit &&
5247 c.permitted.isEmpty()) {
5248 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5249 }
5250
5251 if (c.isSealed()) {
5252 Set<Symbol> permittedTypes = new HashSet<>();
5253 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5254 for (Symbol subTypeSym : c.permitted) {
5255 boolean isTypeVar = false;
5256 if (subTypeSym.type.getTag() == TYPEVAR) {
5257 isTypeVar = true; //error recovery
5258 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5259 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5260 }
5261 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5262 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5263 }
5264 if (permittedTypes.contains(subTypeSym)) {
5265 DiagnosticPosition pos =
5266 env.enclClass.permitting.stream()
5267 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5268 .limit(2).collect(List.collector()).get(1);
5269 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5270 } else {
5271 permittedTypes.add(subTypeSym);
5272 }
5273 if (sealedInUnnamed) {
5274 if (subTypeSym.packge() != c.packge()) {
5275 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5276 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5277 );
5278 }
5279 } else if (subTypeSym.packge().modle != c.packge().modle) {
5280 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5281 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5282 );
5283 }
5284 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5285 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5286 Errors.InvalidPermitsClause(
5287 subTypeSym == c.type.tsym ?
5288 Fragments.MustNotBeSameClass :
5289 Fragments.MustNotBeSupertype(subTypeSym.type)
5290 )
5291 );
5292 } else if (!isTypeVar) {
5293 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5294 .stream()
5295 .anyMatch(d -> d.tsym == c);
5296 if (!thisIsASuper) {
5297 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5298 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5299 }
5300 }
5301 }
5302 }
5303
5304 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5305 .stream()
5306 .filter(s -> s.tsym.isSealed())
5307 .map(s -> (ClassSymbol) s.tsym)
5308 .collect(List.collector());
5309
5310 if (sealedSupers.isEmpty()) {
5311 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5312 boolean hasErrorSuper = false;
5313
5314 hasErrorSuper |= types.directSupertypes(c.type)
5315 .stream()
5316 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5317
5318 ClassType ct = (ClassType) c.type;
5319
5320 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5321
5322 if (!hasErrorSuper) {
5323 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5324 }
5325 }
5326 } else {
5327 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5328 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5329 }
5330
5331 if (!c.type.isCompound()) {
5332 for (ClassSymbol supertypeSym : sealedSupers) {
5333 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5334 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5335 }
5336 }
5337 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5338 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5339 c.isInterface() ?
5340 Errors.NonSealedOrSealedExpected :
5341 Errors.NonSealedSealedOrFinalExpected);
5342 }
5343 }
5344 }
5345
5346 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5347 // because the annotations were not available at the time the env was created. Therefore,
5348 // we look up the environment chain for the first enclosing environment for which the
5349 // lint value is set. Typically, this is the parent env, but might be further if there
5350 // are any envs created as a result of TypeParameter nodes.
5351 Env<AttrContext> lintEnv = env;
5352 while (lintEnv.info.lint == null)
5353 lintEnv = lintEnv.next;
5354
5355 // Having found the enclosing lint value, we can initialize the lint value for this class
5356 env.info.lint = lintEnv.info.lint.augment(c);
5357
5358 Lint prevLint = chk.setLint(env.info.lint);
5359 JavaFileObject prev = log.useSource(c.sourcefile);
5360 ResultInfo prevReturnRes = env.info.returnResult;
5361
5362 try {
5363 deferredLintHandler.flush(env.tree);
5364 env.info.returnResult = null;
5365 // java.lang.Enum may not be subclassed by a non-enum
5366 if (st.tsym == syms.enumSym &&
5367 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5368 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5369
5370 // Enums may not be extended by source-level classes
5371 if (st.tsym != null &&
5372 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5373 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5374 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5375 }
5376
5377 if (rs.isSerializable(c.type)) {
5378 env.info.isSerializable = true;
5379 }
5380
5381 attribClassBody(env, c);
5382
5383 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5384 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5385 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5386 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5387 } finally {
5388 env.info.returnResult = prevReturnRes;
5389 log.useSource(prev);
5390 chk.setLint(prevLint);
5391 }
5392
5393 }
5394 }
5395
5396 public void visitImport(JCImport tree) {
5397 // nothing to do
5398 }
5399
5400 public void visitModuleDef(JCModuleDecl tree) {
5401 tree.sym.completeUsesProvides();
5402 ModuleSymbol msym = tree.sym;
5403 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5404 Lint prevLint = chk.setLint(lint);
5405 chk.checkModuleName(tree);
5406 chk.checkDeprecatedAnnotation(tree, msym);
5407
5408 try {
5409 deferredLintHandler.flush(tree.pos());
5410 } finally {
5411 chk.setLint(prevLint);
5412 }
5413 }
5414
5415 /** Finish the attribution of a class. */
5416 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5417 JCClassDecl tree = (JCClassDecl)env.tree;
5418 Assert.check(c == tree.sym);
5419
5420 // Validate type parameters, supertype and interfaces.
5421 attribStats(tree.typarams, env);
5422 if (!c.isAnonymous()) {
5423 //already checked if anonymous
5424 chk.validate(tree.typarams, env);
5425 chk.validate(tree.extending, env);
5426 chk.validate(tree.implementing, env);
5427 }
5428
5429 c.markAbstractIfNeeded(types);
5430
5431 // If this is a non-abstract class, check that it has no abstract
5432 // methods or unimplemented methods of an implemented interface.
5433 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5434 chk.checkAllDefined(tree.pos(), c);
5435 }
5436
5437 if ((c.flags() & ANNOTATION) != 0) {
5438 if (tree.implementing.nonEmpty())
5439 log.error(tree.implementing.head.pos(),
5440 Errors.CantExtendIntfAnnotation);
5441 if (tree.typarams.nonEmpty()) {
5442 log.error(tree.typarams.head.pos(),
5443 Errors.IntfAnnotationCantHaveTypeParams(c));
5444 }
5445
5446 // If this annotation type has a @Repeatable, validate
5447 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5448 // If this annotation type has a @Repeatable, validate
5449 if (repeatable != null) {
5450 // get diagnostic position for error reporting
5451 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5452 Assert.checkNonNull(cbPos);
5453
5454 chk.validateRepeatable(c, repeatable, cbPos);
5455 }
5456 } else {
5457 // Check that all extended classes and interfaces
5458 // are compatible (i.e. no two define methods with same arguments
5459 // yet different return types). (JLS 8.4.6.3)
5460 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5461 if (allowDefaultMethods) {
5462 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5463 }
5464 }
5465
5466 // Check that class does not import the same parameterized interface
5467 // with two different argument lists.
5468 chk.checkClassBounds(tree.pos(), c.type);
5469
5470 tree.type = c.type;
5471
5472 for (List<JCTypeParameter> l = tree.typarams;
5473 l.nonEmpty(); l = l.tail) {
5474 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5475 }
5476
5477 // Check that a generic class doesn't extend Throwable
5478 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5479 log.error(tree.extending.pos(), Errors.GenericThrowable);
5480
5481 // Check that all methods which implement some
5482 // method conform to the method they implement.
5483 chk.checkImplementations(tree);
5484
5485 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5486 checkAutoCloseable(tree.pos(), env, c.type);
5487
5488 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5489 // Attribute declaration
5490 attribStat(l.head, env);
5491 // Check that declarations in inner classes are not static (JLS 8.1.2)
5492 // Make an exception for static constants.
5493 if (!allowRecords &&
5494 c.owner.kind != PCK &&
5495 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5496 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5497 Symbol sym = null;
5498 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5499 if (sym == null ||
5500 sym.kind != VAR ||
5501 ((VarSymbol) sym).getConstValue() == null)
5502 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5503 }
5504 }
5505
5506 // Check for cycles among non-initial constructors.
5507 chk.checkCyclicConstructors(tree);
5508
5509 // Check for cycles among annotation elements.
5510 chk.checkNonCyclicElements(tree);
5511
5512 // Check for proper use of serialVersionUID and other
5513 // serialization-related fields and methods
5514 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5515 && rs.isSerializable(c.type)
5516 && !c.isAnonymous()) {
5517 chk.checkSerialStructure(tree, c);
5518 }
5519 if (allowTypeAnnos) {
5520 // Correctly organize the positions of the type annotations
5521 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5522
5523 // Check type annotations applicability rules
5524 validateTypeAnnotations(tree, false);
5525 }
5526 }
5527 // where
5528 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5529 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5530 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5531 if (types.isSameType(al.head.annotationType.type, t))
5532 return al.head.pos();
5533 }
5534
5535 return null;
5536 }
5537
5538 private Type capture(Type type) {
5539 return types.capture(type);
5540 }
5541
5542 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5543 if (type.isErroneous()) {
5544 tree.vartype = make.at(Position.NOPOS).Erroneous();
5545 } else {
5546 tree.vartype = make.at(Position.NOPOS).Type(type);
5547 }
5548 }
5549
5550 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5551 tree.accept(new TypeAnnotationsValidator(sigOnly));
5552 }
5553 //where
5554 private final class TypeAnnotationsValidator extends TreeScanner {
5555
5556 private final boolean sigOnly;
5557 public TypeAnnotationsValidator(boolean sigOnly) {
5558 this.sigOnly = sigOnly;
5559 }
5560
5561 public void visitAnnotation(JCAnnotation tree) {
5562 chk.validateTypeAnnotation(tree, false);
5563 super.visitAnnotation(tree);
5564 }
5565 public void visitAnnotatedType(JCAnnotatedType tree) {
5566 if (!tree.underlyingType.type.isErroneous()) {
5567 super.visitAnnotatedType(tree);
5568 }
5569 }
5570 public void visitTypeParameter(JCTypeParameter tree) {
5571 chk.validateTypeAnnotations(tree.annotations, true);
5572 scan(tree.bounds);
5573 // Don't call super.
5574 // This is needed because above we call validateTypeAnnotation with
5575 // false, which would forbid annotations on type parameters.
5576 // super.visitTypeParameter(tree);
5577 }
5578 public void visitMethodDef(JCMethodDecl tree) {
5579 if (tree.recvparam != null &&
5580 !tree.recvparam.vartype.type.isErroneous()) {
5581 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5582 }
5583 if (tree.restype != null && tree.restype.type != null) {
5584 validateAnnotatedType(tree.restype, tree.restype.type);
5585 }
5586 if (sigOnly) {
5587 scan(tree.mods);
5588 scan(tree.restype);
5589 scan(tree.typarams);
5590 scan(tree.recvparam);
5591 scan(tree.params);
5592 scan(tree.thrown);
5593 } else {
5594 scan(tree.defaultValue);
5595 scan(tree.body);
5596 }
5597 }
5598 public void visitVarDef(final JCVariableDecl tree) {
5599 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5600 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5601 validateAnnotatedType(tree.vartype, tree.sym.type);
5602 scan(tree.mods);
5603 scan(tree.vartype);
5604 if (!sigOnly) {
5605 scan(tree.init);
5606 }
5607 }
5608 public void visitTypeCast(JCTypeCast tree) {
5609 if (tree.clazz != null && tree.clazz.type != null)
5610 validateAnnotatedType(tree.clazz, tree.clazz.type);
5611 super.visitTypeCast(tree);
5612 }
5613 public void visitTypeTest(JCInstanceOf tree) {
5614 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5615 validateAnnotatedType(tree.pattern, tree.pattern.type);
5616 super.visitTypeTest(tree);
5617 }
5618 public void visitNewClass(JCNewClass tree) {
5619 if (tree.clazz != null && tree.clazz.type != null) {
5620 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5621 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5622 tree.clazz.type.tsym);
5623 }
5624 if (tree.def != null) {
5625 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5626 }
5627
5628 validateAnnotatedType(tree.clazz, tree.clazz.type);
5629 }
5630 super.visitNewClass(tree);
5631 }
5632 public void visitNewArray(JCNewArray tree) {
5633 if (tree.elemtype != null && tree.elemtype.type != null) {
5634 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5635 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5636 tree.elemtype.type.tsym);
5637 }
5638 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5639 }
5640 super.visitNewArray(tree);
5641 }
5642 public void visitClassDef(JCClassDecl tree) {
5643 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5644 if (sigOnly) {
5645 scan(tree.mods);
5646 scan(tree.typarams);
5647 scan(tree.extending);
5648 scan(tree.implementing);
5649 }
5650 for (JCTree member : tree.defs) {
5651 if (member.hasTag(Tag.CLASSDEF)) {
5652 continue;
5653 }
5654 scan(member);
5655 }
5656 }
5657 public void visitBlock(JCBlock tree) {
5658 if (!sigOnly) {
5659 scan(tree.stats);
5660 }
5661 }
5662
5663 /* I would want to model this after
5664 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5665 * and override visitSelect and visitTypeApply.
5666 * However, we only set the annotated type in the top-level type
5667 * of the symbol.
5668 * Therefore, we need to override each individual location where a type
5669 * can occur.
5670 */
5671 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5672 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5673
5674 if (type.isPrimitiveOrVoid()) {
5675 return;
5676 }
5677
5678 JCTree enclTr = errtree;
5679 Type enclTy = type;
5680
5681 boolean repeat = true;
5682 while (repeat) {
5683 if (enclTr.hasTag(TYPEAPPLY)) {
5684 List<Type> tyargs = enclTy.getTypeArguments();
5685 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5686 if (trargs.length() > 0) {
5687 // Nothing to do for diamonds
5688 if (tyargs.length() == trargs.length()) {
5689 for (int i = 0; i < tyargs.length(); ++i) {
5690 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5691 }
5692 }
5693 // If the lengths don't match, it's either a diamond
5694 // or some nested type that redundantly provides
5695 // type arguments in the tree.
5696 }
5697
5698 // Look at the clazz part of a generic type
5699 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5700 }
5701
5702 if (enclTr.hasTag(SELECT)) {
5703 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5704 if (enclTy != null &&
5705 !enclTy.hasTag(NONE)) {
5706 enclTy = enclTy.getEnclosingType();
5707 }
5708 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5709 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5710 if (enclTy == null || enclTy.hasTag(NONE)) {
5711 if (at.getAnnotations().size() == 1) {
5712 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5713 } else {
5714 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5715 for (JCAnnotation an : at.getAnnotations()) {
5716 comps.add(an.attribute);
5717 }
5718 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5719 }
5720 repeat = false;
5721 }
5722 enclTr = at.underlyingType;
5723 // enclTy doesn't need to be changed
5724 } else if (enclTr.hasTag(IDENT)) {
5725 repeat = false;
5726 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5727 JCWildcard wc = (JCWildcard) enclTr;
5728 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5729 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5730 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5731 } else {
5732 // Nothing to do for UNBOUND
5733 }
5734 repeat = false;
5735 } else if (enclTr.hasTag(TYPEARRAY)) {
5736 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5737 validateAnnotatedType(art.getType(), art.elemtype.type);
5738 repeat = false;
5739 } else if (enclTr.hasTag(TYPEUNION)) {
5740 JCTypeUnion ut = (JCTypeUnion) enclTr;
5741 for (JCTree t : ut.getTypeAlternatives()) {
5742 validateAnnotatedType(t, t.type);
5743 }
5744 repeat = false;
5745 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5746 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5747 for (JCTree t : it.getBounds()) {
5748 validateAnnotatedType(t, t.type);
5749 }
5750 repeat = false;
5751 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5752 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5753 repeat = false;
5754 } else {
5755 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5756 " within: "+ errtree + " with kind: " + errtree.getKind());
5757 }
5758 }
5759 }
5760
5761 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5762 Symbol sym) {
5763 // Ensure that no declaration annotations are present.
5764 // Note that a tree type might be an AnnotatedType with
5765 // empty annotations, if only declaration annotations were given.
5766 // This method will raise an error for such a type.
5767 for (JCAnnotation ai : annotations) {
5768 if (!ai.type.isErroneous() &&
5769 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5770 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5771 }
5772 }
5773 }
5774 }
5775
5776 // <editor-fold desc="post-attribution visitor">
5777
5778 /**
5779 * Handle missing types/symbols in an AST. This routine is useful when
5780 * the compiler has encountered some errors (which might have ended up
5781 * terminating attribution abruptly); if the compiler is used in fail-over
5782 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5783 * prevents NPE to be propagated during subsequent compilation steps.
5784 */
5785 public void postAttr(JCTree tree) {
5786 new PostAttrAnalyzer().scan(tree);
5787 }
5788
5789 class PostAttrAnalyzer extends TreeScanner {
5790
5791 private void initTypeIfNeeded(JCTree that) {
5792 if (that.type == null) {
5793 if (that.hasTag(METHODDEF)) {
5794 that.type = dummyMethodType((JCMethodDecl)that);
5795 } else {
5796 that.type = syms.unknownType;
5797 }
5798 }
5799 }
5800
5801 /* Construct a dummy method type. If we have a method declaration,
5802 * and the declared return type is void, then use that return type
5803 * instead of UNKNOWN to avoid spurious error messages in lambda
5804 * bodies (see:JDK-8041704).
5805 */
5806 private Type dummyMethodType(JCMethodDecl md) {
5807 Type restype = syms.unknownType;
5808 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5809 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5810 if (prim.typetag == VOID)
5811 restype = syms.voidType;
5812 }
5813 return new MethodType(List.nil(), restype,
5814 List.nil(), syms.methodClass);
5815 }
5816 private Type dummyMethodType() {
5817 return dummyMethodType(null);
5818 }
5819
5820 @Override
5821 public void scan(JCTree tree) {
5822 if (tree == null) return;
5823 if (tree instanceof JCExpression) {
5824 initTypeIfNeeded(tree);
5825 }
5826 super.scan(tree);
5827 }
5828
5829 @Override
5830 public void visitIdent(JCIdent that) {
5831 if (that.sym == null) {
5832 that.sym = syms.unknownSymbol;
5833 }
5834 }
5835
5836 @Override
5837 public void visitSelect(JCFieldAccess that) {
5838 if (that.sym == null) {
5839 that.sym = syms.unknownSymbol;
5840 }
5841 super.visitSelect(that);
5842 }
5843
5844 @Override
5845 public void visitClassDef(JCClassDecl that) {
5846 initTypeIfNeeded(that);
5847 if (that.sym == null) {
5848 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
5849 }
5850 super.visitClassDef(that);
5851 }
5852
5853 @Override
5854 public void visitMethodDef(JCMethodDecl that) {
5855 initTypeIfNeeded(that);
5856 if (that.sym == null) {
5857 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
5858 }
5859 super.visitMethodDef(that);
5860 }
5861
5862 @Override
5863 public void visitVarDef(JCVariableDecl that) {
5864 initTypeIfNeeded(that);
5865 if (that.sym == null) {
5866 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
5867 that.sym.adr = 0;
5868 }
5869 if (that.vartype == null) {
5870 that.vartype = make.at(Position.NOPOS).Erroneous();
5871 }
5872 super.visitVarDef(that);
5873 }
5874
5875 @Override
5876 public void visitBindingPattern(JCBindingPattern that) {
5877 initTypeIfNeeded(that);
5878 initTypeIfNeeded(that.var);
5879 if (that.var.sym == null) {
5880 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
5881 that.var.sym.adr = 0;
5882 }
5883 super.visitBindingPattern(that);
5884 }
5885
5886 @Override
5887 public void visitNewClass(JCNewClass that) {
5888 if (that.constructor == null) {
5889 that.constructor = new MethodSymbol(0, names.init,
5890 dummyMethodType(), syms.noSymbol);
5891 }
5892 if (that.constructorType == null) {
5893 that.constructorType = syms.unknownType;
5894 }
5895 super.visitNewClass(that);
5896 }
5897
5898 @Override
5899 public void visitAssignop(JCAssignOp that) {
5900 if (that.operator == null) {
5901 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5902 -1, syms.noSymbol);
5903 }
5904 super.visitAssignop(that);
5905 }
5906
5907 @Override
5908 public void visitBinary(JCBinary that) {
5909 if (that.operator == null) {
5910 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5911 -1, syms.noSymbol);
5912 }
5913 super.visitBinary(that);
5914 }
5915
5916 @Override
5917 public void visitUnary(JCUnary that) {
5918 if (that.operator == null) {
5919 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5920 -1, syms.noSymbol);
5921 }
5922 super.visitUnary(that);
5923 }
5924
5925 @Override
5926 public void visitReference(JCMemberReference that) {
5927 super.visitReference(that);
5928 if (that.sym == null) {
5929 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
5930 syms.noSymbol);
5931 }
5932 }
5933 }
5934 // </editor-fold>
5935
5936 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
5937 new TreeScanner() {
5938 Symbol packge = pkg;
5939 @Override
5940 public void visitIdent(JCIdent that) {
5941 that.sym = packge;
5942 }
5943
5944 @Override
5945 public void visitSelect(JCFieldAccess that) {
5946 that.sym = packge;
5947 packge = packge.owner;
5948 super.visitSelect(that);
5949 }
5950 }.scan(pid);
5951 }
5952
5953 }