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 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1804
1805 prevBindings = c.caseKind == CaseTree.CaseKind.STATEMENT && c.completesNormally ? currentBindings
1806 : null;
1807 }
1808 if (patternSwitch) {
1809 chk.checkSwitchCaseStructure(cases);
1810 }
1811 if (switchTree.hasTag(SWITCH)) {
1812 ((JCSwitch) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1813 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1814 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1815 ((JCSwitchExpression) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1816 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1817 } else {
1818 Assert.error(switchTree.getTag().name());
1819 }
1820 } finally {
1821 switchEnv.info.scope.leave();
1822 }
1823 }
1824 // where
1825 /** Add any variables defined in stats to the switch scope. */
1826 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1827 for (;stats.nonEmpty(); stats = stats.tail) {
1828 JCTree stat = stats.head;
1829 if (stat.hasTag(VARDEF))
1830 switchScope.enter(((JCVariableDecl) stat).sym);
1831 }
1832 }
1833 private void checkCaseLabelDominated(DiagnosticPosition pos,
1834 List<Type> coveredTypes, Type patternType) {
1835 for (Type existing : coveredTypes) {
1836 if (types.isSubtype(patternType, existing)) {
1837 log.error(pos, Errors.PatternDominated);
1838 }
1839 }
1840 }
1841 // where
1842 /** Return the selected enumeration constant symbol, or null. */
1843 private Symbol enumConstant(JCTree tree, Type enumType) {
1844 if (tree.hasTag(IDENT)) {
1845 JCIdent ident = (JCIdent)tree;
1846 Name name = ident.name;
1847 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1848 if (sym.kind == VAR) {
1849 Symbol s = ident.sym = sym;
1850 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1851 ident.type = s.type;
1852 return ((s.flags_field & Flags.ENUM) == 0)
1853 ? null : s;
1854 }
1855 }
1856 }
1857 return null;
1858 }
1859
1860 public void visitSynchronized(JCSynchronized tree) {
1861 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1862 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1863 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1864 }
1865 attribStat(tree.body, env);
1866 result = null;
1867 }
1868 // where
1869 private boolean isValueBased(Type t) {
1870 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1871 }
1872
1873
1874 public void visitTry(JCTry tree) {
1875 // Create a new local environment with a local
1876 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1877 try {
1878 boolean isTryWithResource = tree.resources.nonEmpty();
1879 // Create a nested environment for attributing the try block if needed
1880 Env<AttrContext> tryEnv = isTryWithResource ?
1881 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1882 localEnv;
1883 try {
1884 // Attribute resource declarations
1885 for (JCTree resource : tree.resources) {
1886 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1887 @Override
1888 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1889 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1890 }
1891 };
1892 ResultInfo twrResult =
1893 new ResultInfo(KindSelector.VAR,
1894 syms.autoCloseableType,
1895 twrContext);
1896 if (resource.hasTag(VARDEF)) {
1897 attribStat(resource, tryEnv);
1898 twrResult.check(resource, resource.type);
1899
1900 //check that resource type cannot throw InterruptedException
1901 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1902
1903 VarSymbol var = ((JCVariableDecl) resource).sym;
1904 var.setData(ElementKind.RESOURCE_VARIABLE);
1905 } else {
1906 attribTree(resource, tryEnv, twrResult);
1907 }
1908 }
1909 // Attribute body
1910 attribStat(tree.body, tryEnv);
1911 } finally {
1912 if (isTryWithResource)
1913 tryEnv.info.scope.leave();
1914 }
1915
1916 // Attribute catch clauses
1917 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1918 JCCatch c = l.head;
1919 Env<AttrContext> catchEnv =
1920 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1921 try {
1922 Type ctype = attribStat(c.param, catchEnv);
1923 if (TreeInfo.isMultiCatch(c)) {
1924 //multi-catch parameter is implicitly marked as final
1925 c.param.sym.flags_field |= FINAL | UNION;
1926 }
1927 if (c.param.sym.kind == VAR) {
1928 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1929 }
1930 chk.checkType(c.param.vartype.pos(),
1931 chk.checkClassType(c.param.vartype.pos(), ctype),
1932 syms.throwableType);
1933 attribStat(c.body, catchEnv);
1934 } finally {
1935 catchEnv.info.scope.leave();
1936 }
1937 }
1938
1939 // Attribute finalizer
1940 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1941 result = null;
1942 }
1943 finally {
1944 localEnv.info.scope.leave();
1945 }
1946 }
1947
1948 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1949 if (!resource.isErroneous() &&
1950 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1951 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1952 Symbol close = syms.noSymbol;
1953 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1954 try {
1955 close = rs.resolveQualifiedMethod(pos,
1956 env,
1957 types.skipTypeVars(resource, false),
1958 names.close,
1959 List.nil(),
1960 List.nil());
1961 }
1962 finally {
1963 log.popDiagnosticHandler(discardHandler);
1964 }
1965 if (close.kind == MTH &&
1966 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1967 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1968 env.info.lint.isEnabled(LintCategory.TRY)) {
1969 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1970 }
1971 }
1972 }
1973
1974 public void visitConditional(JCConditional tree) {
1975 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1976 MatchBindings condBindings = matchBindings;
1977
1978 tree.polyKind = (!allowPoly ||
1979 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
1980 isBooleanOrNumeric(env, tree)) ?
1981 PolyKind.STANDALONE : PolyKind.POLY;
1982
1983 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1984 //this means we are returning a poly conditional from void-compatible lambda expression
1985 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
1986 result = tree.type = types.createErrorType(resultInfo.pt);
1987 return;
1988 }
1989
1990 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1991 unknownExprInfo :
1992 resultInfo.dup(conditionalContext(resultInfo.checkContext));
1993
1994
1995 // x ? y : z
1996 // include x's bindings when true in y
1997 // include x's bindings when false in z
1998
1999 Type truetype;
2000 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2001 try {
2002 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2003 } finally {
2004 trueEnv.info.scope.leave();
2005 }
2006
2007 MatchBindings trueBindings = matchBindings;
2008
2009 Type falsetype;
2010 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2011 try {
2012 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2013 } finally {
2014 falseEnv.info.scope.leave();
2015 }
2016
2017 MatchBindings falseBindings = matchBindings;
2018
2019 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2020 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2021 List.of(truetype, falsetype)) : pt();
2022 if (condtype.constValue() != null &&
2023 truetype.constValue() != null &&
2024 falsetype.constValue() != null &&
2025 !owntype.hasTag(NONE)) {
2026 //constant folding
2027 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2028 }
2029 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2030 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2031 }
2032 //where
2033 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2034 switch (tree.getTag()) {
2035 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2036 ((JCLiteral)tree).typetag == BOOLEAN ||
2037 ((JCLiteral)tree).typetag == BOT;
2038 case LAMBDA: case REFERENCE: return false;
2039 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2040 case CONDEXPR:
2041 JCConditional condTree = (JCConditional)tree;
2042 return isBooleanOrNumeric(env, condTree.truepart) &&
2043 isBooleanOrNumeric(env, condTree.falsepart);
2044 case APPLY:
2045 JCMethodInvocation speculativeMethodTree =
2046 (JCMethodInvocation)deferredAttr.attribSpeculative(
2047 tree, env, unknownExprInfo,
2048 argumentAttr.withLocalCacheContext());
2049 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2050 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2051 env.enclClass.type :
2052 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2053 Type owntype = types.memberType(receiverType, msym).getReturnType();
2054 return primitiveOrBoxed(owntype);
2055 case NEWCLASS:
2056 JCExpression className =
2057 removeClassParams.translate(((JCNewClass)tree).clazz);
2058 JCExpression speculativeNewClassTree =
2059 (JCExpression)deferredAttr.attribSpeculative(
2060 className, env, unknownTypeInfo,
2061 argumentAttr.withLocalCacheContext());
2062 return primitiveOrBoxed(speculativeNewClassTree.type);
2063 default:
2064 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2065 argumentAttr.withLocalCacheContext()).type;
2066 return primitiveOrBoxed(speculativeType);
2067 }
2068 }
2069 //where
2070 boolean primitiveOrBoxed(Type t) {
2071 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2072 }
2073
2074 TreeTranslator removeClassParams = new TreeTranslator() {
2075 @Override
2076 public void visitTypeApply(JCTypeApply tree) {
2077 result = translate(tree.clazz);
2078 }
2079 };
2080
2081 CheckContext conditionalContext(CheckContext checkContext) {
2082 return new Check.NestedCheckContext(checkContext) {
2083 //this will use enclosing check context to check compatibility of
2084 //subexpression against target type; if we are in a method check context,
2085 //depending on whether boxing is allowed, we could have incompatibilities
2086 @Override
2087 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2088 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2089 }
2090 };
2091 }
2092
2093 /** Compute the type of a conditional expression, after
2094 * checking that it exists. See JLS 15.25. Does not take into
2095 * account the special case where condition and both arms
2096 * are constants.
2097 *
2098 * @param pos The source position to be used for error
2099 * diagnostics.
2100 * @param thentype The type of the expression's then-part.
2101 * @param elsetype The type of the expression's else-part.
2102 */
2103 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2104 if (condTypes.isEmpty()) {
2105 return syms.objectType; //TODO: how to handle?
2106 }
2107 Type first = condTypes.head;
2108 // If same type, that is the result
2109 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2110 return first.baseType();
2111
2112 List<Type> unboxedTypes = condTypes.stream()
2113 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2114 .collect(List.collector());
2115
2116 // Otherwise, if both arms can be converted to a numeric
2117 // type, return the least numeric type that fits both arms
2118 // (i.e. return larger of the two, or return int if one
2119 // arm is short, the other is char).
2120 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2121 // If one arm has an integer subrange type (i.e., byte,
2122 // short, or char), and the other is an integer constant
2123 // that fits into the subrange, return the subrange type.
2124 for (Type type : unboxedTypes) {
2125 if (!type.getTag().isStrictSubRangeOf(INT)) {
2126 continue;
2127 }
2128 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2129 return type.baseType();
2130 }
2131
2132 for (TypeTag tag : primitiveTags) {
2133 Type candidate = syms.typeOfTag[tag.ordinal()];
2134 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2135 return candidate;
2136 }
2137 }
2138 }
2139
2140 // Those were all the cases that could result in a primitive
2141 condTypes = condTypes.stream()
2142 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2143 .collect(List.collector());
2144
2145 for (Type type : condTypes) {
2146 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2147 return type.baseType();
2148 }
2149
2150 Iterator<DiagnosticPosition> posIt = positions.iterator();
2151
2152 condTypes = condTypes.stream()
2153 .map(t -> chk.checkNonVoid(posIt.next(), t))
2154 .collect(List.collector());
2155
2156 // both are known to be reference types. The result is
2157 // lub(thentype,elsetype). This cannot fail, as it will
2158 // always be possible to infer "Object" if nothing better.
2159 return types.lub(condTypes.stream()
2160 .map(t -> t.baseType())
2161 .filter(t -> !t.hasTag(BOT))
2162 .collect(List.collector()));
2163 }
2164
2165 static final TypeTag[] primitiveTags = new TypeTag[]{
2166 BYTE,
2167 CHAR,
2168 SHORT,
2169 INT,
2170 LONG,
2171 FLOAT,
2172 DOUBLE,
2173 BOOLEAN,
2174 };
2175
2176 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2177 return bindingEnv(env, env.tree, bindings);
2178 }
2179
2180 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2181 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2182 bindings.forEach(env1.info.scope::enter);
2183 return env1;
2184 }
2185
2186 public void visitIf(JCIf tree) {
2187 attribExpr(tree.cond, env, syms.booleanType);
2188
2189 // if (x) { y } [ else z ]
2190 // include x's bindings when true in y
2191 // include x's bindings when false in z
2192
2193 MatchBindings condBindings = matchBindings;
2194 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2195
2196 try {
2197 attribStat(tree.thenpart, thenEnv);
2198 } finally {
2199 thenEnv.info.scope.leave();
2200 }
2201
2202 preFlow(tree.thenpart);
2203 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2204 boolean aliveAfterElse;
2205
2206 if (tree.elsepart != null) {
2207 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2208 try {
2209 attribStat(tree.elsepart, elseEnv);
2210 } finally {
2211 elseEnv.info.scope.leave();
2212 }
2213 preFlow(tree.elsepart);
2214 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2215 } else {
2216 aliveAfterElse = true;
2217 }
2218
2219 chk.checkEmptyIf(tree);
2220
2221 List<BindingSymbol> afterIfBindings = List.nil();
2222
2223 if (aliveAfterThen && !aliveAfterElse) {
2224 afterIfBindings = condBindings.bindingsWhenTrue;
2225 } else if (aliveAfterElse && !aliveAfterThen) {
2226 afterIfBindings = condBindings.bindingsWhenFalse;
2227 }
2228
2229 afterIfBindings.forEach(env.info.scope::enter);
2230 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2231
2232 result = null;
2233 }
2234
2235 void preFlow(JCTree tree) {
2236 attrRecover.doRecovery();
2237 new PostAttrAnalyzer() {
2238 @Override
2239 public void scan(JCTree tree) {
2240 if (tree == null ||
2241 (tree.type != null &&
2242 tree.type == Type.stuckType)) {
2243 //don't touch stuck expressions!
2244 return;
2245 }
2246 super.scan(tree);
2247 }
2248
2249 @Override
2250 public void visitClassDef(JCClassDecl that) {
2251 if (that.sym != null) {
2252 // Method preFlow shouldn't visit class definitions
2253 // that have not been entered and attributed.
2254 // See JDK-8254557 and JDK-8203277 for more details.
2255 super.visitClassDef(that);
2256 }
2257 }
2258
2259 @Override
2260 public void visitLambda(JCLambda that) {
2261 if (that.type != null) {
2262 // Method preFlow shouldn't visit lambda expressions
2263 // that have not been entered and attributed.
2264 // See JDK-8254557 and JDK-8203277 for more details.
2265 super.visitLambda(that);
2266 }
2267 }
2268 }.scan(tree);
2269 }
2270
2271 public void visitExec(JCExpressionStatement tree) {
2272 //a fresh environment is required for 292 inference to work properly ---
2273 //see Infer.instantiatePolymorphicSignatureInstance()
2274 Env<AttrContext> localEnv = env.dup(tree);
2275 attribExpr(tree.expr, localEnv);
2276 result = null;
2277 }
2278
2279 public void visitBreak(JCBreak tree) {
2280 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2281 result = null;
2282 }
2283
2284 public void visitYield(JCYield tree) {
2285 if (env.info.yieldResult != null) {
2286 attribTree(tree.value, env, env.info.yieldResult);
2287 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2288 } else {
2289 log.error(tree.pos(), tree.value.hasTag(PARENS)
2290 ? Errors.NoSwitchExpressionQualify
2291 : Errors.NoSwitchExpression);
2292 attribTree(tree.value, env, unknownExprInfo);
2293 }
2294 result = null;
2295 }
2296
2297 public void visitContinue(JCContinue tree) {
2298 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2299 result = null;
2300 }
2301 //where
2302 /** Return the target of a break, continue or yield statement,
2303 * if it exists, report an error if not.
2304 * Note: The target of a labelled break or continue is the
2305 * (non-labelled) statement tree referred to by the label,
2306 * not the tree representing the labelled statement itself.
2307 *
2308 * @param pos The position to be used for error diagnostics
2309 * @param tag The tag of the jump statement. This is either
2310 * Tree.BREAK or Tree.CONTINUE.
2311 * @param label The label of the jump statement, or null if no
2312 * label is given.
2313 * @param env The environment current at the jump statement.
2314 */
2315 private JCTree findJumpTarget(DiagnosticPosition pos,
2316 JCTree.Tag tag,
2317 Name label,
2318 Env<AttrContext> env) {
2319 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2320
2321 if (jumpTarget.snd != null) {
2322 log.error(pos, jumpTarget.snd);
2323 }
2324
2325 return jumpTarget.fst;
2326 }
2327 /** Return the target of a break or continue statement, if it exists,
2328 * report an error if not.
2329 * Note: The target of a labelled break or continue is the
2330 * (non-labelled) statement tree referred to by the label,
2331 * not the tree representing the labelled statement itself.
2332 *
2333 * @param tag The tag of the jump statement. This is either
2334 * Tree.BREAK or Tree.CONTINUE.
2335 * @param label The label of the jump statement, or null if no
2336 * label is given.
2337 * @param env The environment current at the jump statement.
2338 */
2339 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2340 Name label,
2341 Env<AttrContext> env) {
2342 // Search environments outwards from the point of jump.
2343 Env<AttrContext> env1 = env;
2344 JCDiagnostic.Error pendingError = null;
2345 LOOP:
2346 while (env1 != null) {
2347 switch (env1.tree.getTag()) {
2348 case LABELLED:
2349 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2350 if (label == labelled.label) {
2351 // If jump is a continue, check that target is a loop.
2352 if (tag == CONTINUE) {
2353 if (!labelled.body.hasTag(DOLOOP) &&
2354 !labelled.body.hasTag(WHILELOOP) &&
2355 !labelled.body.hasTag(FORLOOP) &&
2356 !labelled.body.hasTag(FOREACHLOOP)) {
2357 pendingError = Errors.NotLoopLabel(label);
2358 }
2359 // Found labelled statement target, now go inwards
2360 // to next non-labelled tree.
2361 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2362 } else {
2363 return Pair.of(labelled, pendingError);
2364 }
2365 }
2366 break;
2367 case DOLOOP:
2368 case WHILELOOP:
2369 case FORLOOP:
2370 case FOREACHLOOP:
2371 if (label == null) return Pair.of(env1.tree, pendingError);
2372 break;
2373 case SWITCH:
2374 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2375 break;
2376 case SWITCH_EXPRESSION:
2377 if (tag == YIELD) {
2378 return Pair.of(env1.tree, null);
2379 } else if (tag == BREAK) {
2380 pendingError = Errors.BreakOutsideSwitchExpression;
2381 } else {
2382 pendingError = Errors.ContinueOutsideSwitchExpression;
2383 }
2384 break;
2385 case LAMBDA:
2386 case METHODDEF:
2387 case CLASSDEF:
2388 break LOOP;
2389 default:
2390 }
2391 env1 = env1.next;
2392 }
2393 if (label != null)
2394 return Pair.of(null, Errors.UndefLabel(label));
2395 else if (pendingError != null)
2396 return Pair.of(null, pendingError);
2397 else if (tag == CONTINUE)
2398 return Pair.of(null, Errors.ContOutsideLoop);
2399 else
2400 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2401 }
2402
2403 public void visitReturn(JCReturn tree) {
2404 // Check that there is an enclosing method which is
2405 // nested within than the enclosing class.
2406 if (env.info.returnResult == null) {
2407 log.error(tree.pos(), Errors.RetOutsideMeth);
2408 } else if (env.info.yieldResult != null) {
2409 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2410 } else if (!env.info.isLambda &&
2411 !env.info.isNewClass &&
2412 env.enclMethod != null &&
2413 TreeInfo.isCompactConstructor(env.enclMethod)) {
2414 log.error(env.enclMethod,
2415 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2416 } else {
2417 // Attribute return expression, if it exists, and check that
2418 // it conforms to result type of enclosing method.
2419 if (tree.expr != null) {
2420 if (env.info.returnResult.pt.hasTag(VOID)) {
2421 env.info.returnResult.checkContext.report(tree.expr.pos(),
2422 diags.fragment(Fragments.UnexpectedRetVal));
2423 }
2424 attribTree(tree.expr, env, env.info.returnResult);
2425 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2426 !env.info.returnResult.pt.hasTag(NONE)) {
2427 env.info.returnResult.checkContext.report(tree.pos(),
2428 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2429 }
2430 }
2431 result = null;
2432 }
2433
2434 public void visitThrow(JCThrow tree) {
2435 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
2436 if (allowPoly) {
2437 chk.checkType(tree, owntype, syms.throwableType);
2438 }
2439 result = null;
2440 }
2441
2442 public void visitAssert(JCAssert tree) {
2443 attribExpr(tree.cond, env, syms.booleanType);
2444 if (tree.detail != null) {
2445 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2446 }
2447 result = null;
2448 }
2449
2450 /** Visitor method for method invocations.
2451 * NOTE: The method part of an application will have in its type field
2452 * the return type of the method, not the method's type itself!
2453 */
2454 public void visitApply(JCMethodInvocation tree) {
2455 // The local environment of a method application is
2456 // a new environment nested in the current one.
2457 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2458
2459 // The types of the actual method arguments.
2460 List<Type> argtypes;
2461
2462 // The types of the actual method type arguments.
2463 List<Type> typeargtypes = null;
2464
2465 Name methName = TreeInfo.name(tree.meth);
2466
2467 boolean isConstructorCall =
2468 methName == names._this || methName == names._super;
2469
2470 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2471 if (isConstructorCall) {
2472 // We are seeing a ...this(...) or ...super(...) call.
2473 // Check that this is the first statement in a constructor.
2474 checkFirstConstructorStat(tree, env.enclMethod, true);
2475
2476 // Record the fact
2477 // that this is a constructor call (using isSelfCall).
2478 localEnv.info.isSelfCall = true;
2479
2480 // Attribute arguments, yielding list of argument types.
2481 localEnv.info.constructorArgs = true;
2482 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2483 localEnv.info.constructorArgs = false;
2484 argtypes = argtypesBuf.toList();
2485 typeargtypes = attribTypes(tree.typeargs, localEnv);
2486
2487 // Variable `site' points to the class in which the called
2488 // constructor is defined.
2489 Type site = env.enclClass.sym.type;
2490 if (methName == names._super) {
2491 if (site == syms.objectType) {
2492 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2493 site = types.createErrorType(syms.objectType);
2494 } else {
2495 site = types.supertype(site);
2496 }
2497 }
2498
2499 if (site.hasTag(CLASS)) {
2500 Type encl = site.getEnclosingType();
2501 while (encl != null && encl.hasTag(TYPEVAR))
2502 encl = encl.getUpperBound();
2503 if (encl.hasTag(CLASS)) {
2504 // we are calling a nested class
2505
2506 if (tree.meth.hasTag(SELECT)) {
2507 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2508
2509 // We are seeing a prefixed call, of the form
2510 // <expr>.super(...).
2511 // Check that the prefix expression conforms
2512 // to the outer instance type of the class.
2513 chk.checkRefType(qualifier.pos(),
2514 attribExpr(qualifier, localEnv,
2515 encl));
2516 } else if (methName == names._super) {
2517 // qualifier omitted; check for existence
2518 // of an appropriate implicit qualifier.
2519 rs.resolveImplicitThis(tree.meth.pos(),
2520 localEnv, site, true);
2521 }
2522 } else if (tree.meth.hasTag(SELECT)) {
2523 log.error(tree.meth.pos(),
2524 Errors.IllegalQualNotIcls(site.tsym));
2525 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2526 }
2527
2528 // if we're calling a java.lang.Enum constructor,
2529 // prefix the implicit String and int parameters
2530 if (site.tsym == syms.enumSym)
2531 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2532
2533 // Resolve the called constructor under the assumption
2534 // that we are referring to a superclass instance of the
2535 // current instance (JLS ???).
2536 boolean selectSuperPrev = localEnv.info.selectSuper;
2537 localEnv.info.selectSuper = true;
2538 localEnv.info.pendingResolutionPhase = null;
2539 Symbol sym = rs.resolveConstructor(
2540 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2541 localEnv.info.selectSuper = selectSuperPrev;
2542
2543 // Set method symbol to resolved constructor...
2544 TreeInfo.setSymbol(tree.meth, sym);
2545
2546 // ...and check that it is legal in the current context.
2547 // (this will also set the tree's type)
2548 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2549 checkId(tree.meth, site, sym, localEnv,
2550 new ResultInfo(kind, mpt));
2551 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2552 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2553 }
2554 // Otherwise, `site' is an error type and we do nothing
2555 result = tree.type = syms.voidType;
2556 } else {
2557 // Otherwise, we are seeing a regular method call.
2558 // Attribute the arguments, yielding list of argument types, ...
2559 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2560 argtypes = argtypesBuf.toList();
2561 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2562
2563 // ... and attribute the method using as a prototype a methodtype
2564 // whose formal argument types is exactly the list of actual
2565 // arguments (this will also set the method symbol).
2566 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2567 localEnv.info.pendingResolutionPhase = null;
2568 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2569
2570 // Compute the result type.
2571 Type restype = mtype.getReturnType();
2572 if (restype.hasTag(WILDCARD))
2573 throw new AssertionError(mtype);
2574
2575 Type qualifier = (tree.meth.hasTag(SELECT))
2576 ? ((JCFieldAccess) tree.meth).selected.type
2577 : env.enclClass.sym.type;
2578 Symbol msym = TreeInfo.symbol(tree.meth);
2579 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2580
2581 chk.checkRefTypes(tree.typeargs, typeargtypes);
2582
2583 // Check that value of resulting type is admissible in the
2584 // current context. Also, capture the return type
2585 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2586 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2587 }
2588 chk.validate(tree.typeargs, localEnv);
2589 }
2590 //where
2591 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2592 if (msym != null &&
2593 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2594 methodName == names.getClass &&
2595 argtypes.isEmpty()) {
2596 // as a special case, x.getClass() has type Class<? extends |X|>
2597 return new ClassType(restype.getEnclosingType(),
2598 List.of(new WildcardType(types.erasure(qualifierType),
2599 BoundKind.EXTENDS,
2600 syms.boundClass)),
2601 restype.tsym,
2602 restype.getMetadata());
2603 } else if (msym != null &&
2604 msym.owner == syms.arrayClass &&
2605 methodName == names.clone &&
2606 types.isArray(qualifierType)) {
2607 // as a special case, array.clone() has a result that is
2608 // the same as static type of the array being cloned
2609 return qualifierType;
2610 } else {
2611 return restype;
2612 }
2613 }
2614
2615 /** Check that given application node appears as first statement
2616 * in a constructor call.
2617 * @param tree The application node
2618 * @param enclMethod The enclosing method of the application.
2619 * @param error Should an error be issued?
2620 */
2621 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2622 if (enclMethod != null && enclMethod.name == names.init) {
2623 JCBlock body = enclMethod.body;
2624 if (body.stats.head.hasTag(EXEC) &&
2625 ((JCExpressionStatement) body.stats.head).expr == tree)
2626 return true;
2627 }
2628 if (error) {
2629 log.error(tree.pos(),
2630 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2631 }
2632 return false;
2633 }
2634
2635 /** Obtain a method type with given argument types.
2636 */
2637 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2638 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2639 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2640 }
2641
2642 public void visitNewClass(final JCNewClass tree) {
2643 Type owntype = types.createErrorType(tree.type);
2644
2645 // The local environment of a class creation is
2646 // a new environment nested in the current one.
2647 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2648
2649 // The anonymous inner class definition of the new expression,
2650 // if one is defined by it.
2651 JCClassDecl cdef = tree.def;
2652
2653 // If enclosing class is given, attribute it, and
2654 // complete class name to be fully qualified
2655 JCExpression clazz = tree.clazz; // Class field following new
2656 JCExpression clazzid; // Identifier in class field
2657 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2658 annoclazzid = null;
2659
2660 if (clazz.hasTag(TYPEAPPLY)) {
2661 clazzid = ((JCTypeApply) clazz).clazz;
2662 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2663 annoclazzid = (JCAnnotatedType) clazzid;
2664 clazzid = annoclazzid.underlyingType;
2665 }
2666 } else {
2667 if (clazz.hasTag(ANNOTATED_TYPE)) {
2668 annoclazzid = (JCAnnotatedType) clazz;
2669 clazzid = annoclazzid.underlyingType;
2670 } else {
2671 clazzid = clazz;
2672 }
2673 }
2674
2675 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2676
2677 if (tree.encl != null) {
2678 // We are seeing a qualified new, of the form
2679 // <expr>.new C <...> (...) ...
2680 // In this case, we let clazz stand for the name of the
2681 // allocated class C prefixed with the type of the qualifier
2682 // expression, so that we can
2683 // resolve it with standard techniques later. I.e., if
2684 // <expr> has type T, then <expr>.new C <...> (...)
2685 // yields a clazz T.C.
2686 Type encltype = chk.checkRefType(tree.encl.pos(),
2687 attribExpr(tree.encl, env));
2688 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2689 // from expr to the combined type, or not? Yes, do this.
2690 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2691 ((JCIdent) clazzid).name);
2692
2693 EndPosTable endPosTable = this.env.toplevel.endPositions;
2694 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2695 if (clazz.hasTag(ANNOTATED_TYPE)) {
2696 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2697 List<JCAnnotation> annos = annoType.annotations;
2698
2699 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2700 clazzid1 = make.at(tree.pos).
2701 TypeApply(clazzid1,
2702 ((JCTypeApply) clazz).arguments);
2703 }
2704
2705 clazzid1 = make.at(tree.pos).
2706 AnnotatedType(annos, clazzid1);
2707 } else if (clazz.hasTag(TYPEAPPLY)) {
2708 clazzid1 = make.at(tree.pos).
2709 TypeApply(clazzid1,
2710 ((JCTypeApply) clazz).arguments);
2711 }
2712
2713 clazz = clazzid1;
2714 }
2715
2716 // Attribute clazz expression and store
2717 // symbol + type back into the attributed tree.
2718 Type clazztype;
2719
2720 try {
2721 env.info.isNewClass = true;
2722 clazztype = TreeInfo.isEnumInit(env.tree) ?
2723 attribIdentAsEnumType(env, (JCIdent)clazz) :
2724 attribType(clazz, env);
2725 } finally {
2726 env.info.isNewClass = false;
2727 }
2728
2729 clazztype = chk.checkDiamond(tree, clazztype);
2730 chk.validate(clazz, localEnv);
2731 if (tree.encl != null) {
2732 // We have to work in this case to store
2733 // symbol + type back into the attributed tree.
2734 tree.clazz.type = clazztype;
2735 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2736 clazzid.type = ((JCIdent) clazzid).sym.type;
2737 if (annoclazzid != null) {
2738 annoclazzid.type = clazzid.type;
2739 }
2740 if (!clazztype.isErroneous()) {
2741 if (cdef != null && clazztype.tsym.isInterface()) {
2742 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2743 } else if (clazztype.tsym.isStatic()) {
2744 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2745 }
2746 }
2747 } else if (!clazztype.tsym.isInterface() &&
2748 clazztype.getEnclosingType().hasTag(CLASS)) {
2749 // Check for the existence of an apropos outer instance
2750 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2751 }
2752
2753 // Attribute constructor arguments.
2754 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2755 final KindSelector pkind =
2756 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2757 List<Type> argtypes = argtypesBuf.toList();
2758 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2759
2760 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2761 // Enums may not be instantiated except implicitly
2762 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2763 (!env.tree.hasTag(VARDEF) ||
2764 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2765 ((JCVariableDecl) env.tree).init != tree))
2766 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2767
2768 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2769 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2770 boolean skipNonDiamondPath = false;
2771 // Check that class is not abstract
2772 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2773 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2774 log.error(tree.pos(),
2775 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2776 skipNonDiamondPath = true;
2777 } else if (cdef != null && clazztype.tsym.isInterface()) {
2778 // Check that no constructor arguments are given to
2779 // anonymous classes implementing an interface
2780 if (!argtypes.isEmpty())
2781 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2782
2783 if (!typeargtypes.isEmpty())
2784 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2785
2786 // Error recovery: pretend no arguments were supplied.
2787 argtypes = List.nil();
2788 typeargtypes = List.nil();
2789 skipNonDiamondPath = true;
2790 }
2791 if (TreeInfo.isDiamond(tree)) {
2792 ClassType site = new ClassType(clazztype.getEnclosingType(),
2793 clazztype.tsym.type.getTypeArguments(),
2794 clazztype.tsym,
2795 clazztype.getMetadata());
2796
2797 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2798 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2799 diamondEnv.info.pendingResolutionPhase = null;
2800
2801 //if the type of the instance creation expression is a class type
2802 //apply method resolution inference (JLS 15.12.2.7). The return type
2803 //of the resolved constructor will be a partially instantiated type
2804 Symbol constructor = rs.resolveDiamond(tree.pos(),
2805 diamondEnv,
2806 site,
2807 argtypes,
2808 typeargtypes);
2809 tree.constructor = constructor.baseSymbol();
2810
2811 final TypeSymbol csym = clazztype.tsym;
2812 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2813 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2814 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2815 constructorType = checkId(tree, site,
2816 constructor,
2817 diamondEnv,
2818 diamondResult);
2819
2820 tree.clazz.type = types.createErrorType(clazztype);
2821 if (!constructorType.isErroneous()) {
2822 tree.clazz.type = clazz.type = constructorType.getReturnType();
2823 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2824 }
2825 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2826 }
2827
2828 // Resolve the called constructor under the assumption
2829 // that we are referring to a superclass instance of the
2830 // current instance (JLS ???).
2831 else if (!skipNonDiamondPath) {
2832 //the following code alters some of the fields in the current
2833 //AttrContext - hence, the current context must be dup'ed in
2834 //order to avoid downstream failures
2835 Env<AttrContext> rsEnv = localEnv.dup(tree);
2836 rsEnv.info.selectSuper = cdef != null;
2837 rsEnv.info.pendingResolutionPhase = null;
2838 tree.constructor = rs.resolveConstructor(
2839 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2840 if (cdef == null) { //do not check twice!
2841 tree.constructorType = checkId(tree,
2842 clazztype,
2843 tree.constructor,
2844 rsEnv,
2845 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2846 if (rsEnv.info.lastResolveVarargs())
2847 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2848 }
2849 }
2850
2851 if (cdef != null) {
2852 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2853 return;
2854 }
2855
2856 if (tree.constructor != null && tree.constructor.kind == MTH)
2857 owntype = clazztype;
2858 }
2859 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2860 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2861 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2862 //we need to wait for inference to finish and then replace inference vars in the constructor type
2863 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2864 instantiatedContext -> {
2865 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2866 });
2867 }
2868 chk.validate(tree.typeargs, localEnv);
2869 }
2870
2871 // where
2872 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2873 JCClassDecl cdef, Env<AttrContext> localEnv,
2874 List<Type> argtypes, List<Type> typeargtypes,
2875 KindSelector pkind) {
2876 // We are seeing an anonymous class instance creation.
2877 // In this case, the class instance creation
2878 // expression
2879 //
2880 // E.new <typeargs1>C<typargs2>(args) { ... }
2881 //
2882 // is represented internally as
2883 //
2884 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2885 //
2886 // This expression is then *transformed* as follows:
2887 //
2888 // (1) add an extends or implements clause
2889 // (2) add a constructor.
2890 //
2891 // For instance, if C is a class, and ET is the type of E,
2892 // the expression
2893 //
2894 // E.new <typeargs1>C<typargs2>(args) { ... }
2895 //
2896 // is translated to (where X is a fresh name and typarams is the
2897 // parameter list of the super constructor):
2898 //
2899 // new <typeargs1>X(<*nullchk*>E, args) where
2900 // X extends C<typargs2> {
2901 // <typarams> X(ET e, args) {
2902 // e.<typeargs1>super(args)
2903 // }
2904 // ...
2905 // }
2906 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2907 final boolean isDiamond = TreeInfo.isDiamond(tree);
2908 if (isDiamond
2909 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2910 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2911 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2912 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2913 instantiatedContext -> {
2914 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2915 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2916 ResultInfo prevResult = this.resultInfo;
2917 try {
2918 this.resultInfo = resultInfoForClassDefinition;
2919 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2920 localEnv, argtypes, typeargtypes, pkind);
2921 } finally {
2922 this.resultInfo = prevResult;
2923 }
2924 });
2925 } else {
2926 if (isDiamond && clazztype.hasTag(CLASS)) {
2927 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2928 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2929 // One or more types inferred in the previous steps is non-denotable.
2930 Fragment fragment = Diamond(clazztype.tsym);
2931 log.error(tree.clazz.pos(),
2932 Errors.CantApplyDiamond1(
2933 fragment,
2934 invalidDiamondArgs.size() > 1 ?
2935 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2936 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2937 }
2938 // For <>(){}, inferred types must also be accessible.
2939 for (Type t : clazztype.getTypeArguments()) {
2940 rs.checkAccessibleType(env, t);
2941 }
2942 }
2943
2944 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2945 // false for isInterface call even when the original type is an interface.
2946 boolean implementing = clazztype.tsym.isInterface() ||
2947 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2948 clazztype.getOriginalType().tsym.isInterface();
2949
2950 if (implementing) {
2951 cdef.implementing = List.of(clazz);
2952 } else {
2953 cdef.extending = clazz;
2954 }
2955
2956 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2957 isSerializable(clazztype)) {
2958 localEnv.info.isSerializable = true;
2959 }
2960
2961 attribStat(cdef, localEnv);
2962
2963 List<Type> finalargtypes;
2964 // If an outer instance is given,
2965 // prefix it to the constructor arguments
2966 // and delete it from the new expression
2967 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2968 finalargtypes = argtypes.prepend(tree.encl.type);
2969 } else {
2970 finalargtypes = argtypes;
2971 }
2972
2973 // Reassign clazztype and recompute constructor. As this necessarily involves
2974 // another attribution pass for deferred types in the case of <>, replicate
2975 // them. Original arguments have right decorations already.
2976 if (isDiamond && pkind.contains(KindSelector.POLY)) {
2977 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
2978 }
2979
2980 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
2981 : cdef.sym.type;
2982 Symbol sym = tree.constructor = rs.resolveConstructor(
2983 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
2984 Assert.check(!sym.kind.isResolutionError());
2985 tree.constructor = sym;
2986 tree.constructorType = checkId(tree,
2987 clazztype,
2988 tree.constructor,
2989 localEnv,
2990 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2991 }
2992 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
2993 clazztype : types.createErrorType(tree.type);
2994 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
2995 chk.validate(tree.typeargs, localEnv);
2996 }
2997
2998 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
2999 return new Check.NestedCheckContext(checkContext) {
3000 @Override
3001 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3002 enclosingContext.report(clazz.clazz,
3003 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3004 }
3005 };
3006 }
3007
3008 /** Make an attributed null check tree.
3009 */
3010 public JCExpression makeNullCheck(JCExpression arg) {
3011 // optimization: new Outer() can never be null; skip null check
3012 if (arg.getTag() == NEWCLASS)
3013 return arg;
3014 // optimization: X.this is never null; skip null check
3015 Name name = TreeInfo.name(arg);
3016 if (name == names._this || name == names._super) return arg;
3017
3018 JCTree.Tag optag = NULLCHK;
3019 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3020 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3021 tree.type = arg.type;
3022 return tree;
3023 }
3024
3025 public void visitNewArray(JCNewArray tree) {
3026 Type owntype = types.createErrorType(tree.type);
3027 Env<AttrContext> localEnv = env.dup(tree);
3028 Type elemtype;
3029 if (tree.elemtype != null) {
3030 elemtype = attribType(tree.elemtype, localEnv);
3031 chk.validate(tree.elemtype, localEnv);
3032 owntype = elemtype;
3033 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3034 attribExpr(l.head, localEnv, syms.intType);
3035 owntype = new ArrayType(owntype, syms.arrayClass);
3036 }
3037 } else {
3038 // we are seeing an untyped aggregate { ... }
3039 // this is allowed only if the prototype is an array
3040 if (pt().hasTag(ARRAY)) {
3041 elemtype = types.elemtype(pt());
3042 } else {
3043 if (!pt().hasTag(ERROR) &&
3044 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3045 log.error(tree.pos(),
3046 Errors.IllegalInitializerForType(pt()));
3047 }
3048 elemtype = types.createErrorType(pt());
3049 }
3050 }
3051 if (tree.elems != null) {
3052 attribExprs(tree.elems, localEnv, elemtype);
3053 owntype = new ArrayType(elemtype, syms.arrayClass);
3054 }
3055 if (!types.isReifiable(elemtype))
3056 log.error(tree.pos(), Errors.GenericArrayCreation);
3057 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3058 }
3059
3060 /*
3061 * A lambda expression can only be attributed when a target-type is available.
3062 * In addition, if the target-type is that of a functional interface whose
3063 * descriptor contains inference variables in argument position the lambda expression
3064 * is 'stuck' (see DeferredAttr).
3065 */
3066 @Override
3067 public void visitLambda(final JCLambda that) {
3068 boolean wrongContext = false;
3069 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3070 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3071 //lambda only allowed in assignment or method invocation/cast context
3072 log.error(that.pos(), Errors.UnexpectedLambda);
3073 }
3074 resultInfo = recoveryInfo;
3075 wrongContext = true;
3076 }
3077 //create an environment for attribution of the lambda expression
3078 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3079 boolean needsRecovery =
3080 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3081 try {
3082 if (needsRecovery && isSerializable(pt())) {
3083 localEnv.info.isSerializable = true;
3084 localEnv.info.isSerializableLambda = true;
3085 }
3086 List<Type> explicitParamTypes = null;
3087 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3088 //attribute lambda parameters
3089 attribStats(that.params, localEnv);
3090 explicitParamTypes = TreeInfo.types(that.params);
3091 }
3092
3093 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3094 Type currentTarget = targetInfo.target;
3095 Type lambdaType = targetInfo.descriptor;
3096
3097 if (currentTarget.isErroneous()) {
3098 result = that.type = currentTarget;
3099 return;
3100 }
3101
3102 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3103
3104 if (lambdaType.hasTag(FORALL)) {
3105 //lambda expression target desc cannot be a generic method
3106 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3107 kindName(currentTarget.tsym),
3108 currentTarget.tsym);
3109 resultInfo.checkContext.report(that, diags.fragment(msg));
3110 result = that.type = types.createErrorType(pt());
3111 return;
3112 }
3113
3114 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3115 //add param type info in the AST
3116 List<Type> actuals = lambdaType.getParameterTypes();
3117 List<JCVariableDecl> params = that.params;
3118
3119 boolean arityMismatch = false;
3120
3121 while (params.nonEmpty()) {
3122 if (actuals.isEmpty()) {
3123 //not enough actuals to perform lambda parameter inference
3124 arityMismatch = true;
3125 }
3126 //reset previously set info
3127 Type argType = arityMismatch ?
3128 syms.errType :
3129 actuals.head;
3130 if (params.head.isImplicitlyTyped()) {
3131 setSyntheticVariableType(params.head, argType);
3132 }
3133 params.head.sym = null;
3134 actuals = actuals.isEmpty() ?
3135 actuals :
3136 actuals.tail;
3137 params = params.tail;
3138 }
3139
3140 //attribute lambda parameters
3141 attribStats(that.params, localEnv);
3142
3143 if (arityMismatch) {
3144 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3145 result = that.type = types.createErrorType(currentTarget);
3146 return;
3147 }
3148 }
3149
3150 //from this point on, no recovery is needed; if we are in assignment context
3151 //we will be able to attribute the whole lambda body, regardless of errors;
3152 //if we are in a 'check' method context, and the lambda is not compatible
3153 //with the target-type, it will be recovered anyway in Attr.checkId
3154 needsRecovery = false;
3155
3156 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3157 lambdaBodyResult(that, lambdaType, resultInfo);
3158
3159 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3160 attribTree(that.getBody(), localEnv, bodyResultInfo);
3161 } else {
3162 JCBlock body = (JCBlock)that.body;
3163 if (body == breakTree &&
3164 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3165 breakTreeFound(copyEnv(localEnv));
3166 }
3167 attribStats(body.stats, localEnv);
3168 }
3169
3170 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3171
3172 boolean isSpeculativeRound =
3173 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3174
3175 preFlow(that);
3176 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3177
3178 that.type = currentTarget; //avoids recovery at this stage
3179 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3180
3181 if (!isSpeculativeRound) {
3182 //add thrown types as bounds to the thrown types free variables if needed:
3183 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3184 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3185 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3186 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3187 }
3188 }
3189
3190 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3191 }
3192 result = wrongContext ? that.type = types.createErrorType(pt())
3193 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3194 } catch (Types.FunctionDescriptorLookupError ex) {
3195 JCDiagnostic cause = ex.getDiagnostic();
3196 resultInfo.checkContext.report(that, cause);
3197 result = that.type = types.createErrorType(pt());
3198 return;
3199 } catch (CompletionFailure cf) {
3200 chk.completionError(that.pos(), cf);
3201 } catch (Throwable t) {
3202 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3203 //as that would likely cause the same exception again.
3204 needsRecovery = false;
3205 throw t;
3206 } finally {
3207 localEnv.info.scope.leave();
3208 if (needsRecovery) {
3209 Type prevResult = result;
3210 try {
3211 attribTree(that, env, recoveryInfo);
3212 } finally {
3213 if (result == Type.recoveryType) {
3214 result = prevResult;
3215 }
3216 }
3217 }
3218 }
3219 }
3220 //where
3221 class TargetInfo {
3222 Type target;
3223 Type descriptor;
3224
3225 public TargetInfo(Type target, Type descriptor) {
3226 this.target = target;
3227 this.descriptor = descriptor;
3228 }
3229 }
3230
3231 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3232 Type lambdaType;
3233 Type currentTarget = resultInfo.pt;
3234 if (resultInfo.pt != Type.recoveryType) {
3235 /* We need to adjust the target. If the target is an
3236 * intersection type, for example: SAM & I1 & I2 ...
3237 * the target will be updated to SAM
3238 */
3239 currentTarget = targetChecker.visit(currentTarget, that);
3240 if (!currentTarget.isIntersection()) {
3241 if (explicitParamTypes != null) {
3242 currentTarget = infer.instantiateFunctionalInterface(that,
3243 currentTarget, explicitParamTypes, resultInfo.checkContext);
3244 }
3245 currentTarget = types.removeWildcards(currentTarget);
3246 lambdaType = types.findDescriptorType(currentTarget);
3247 } else {
3248 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3249 ListBuffer<Type> components = new ListBuffer<>();
3250 for (Type bound : ict.getExplicitComponents()) {
3251 if (explicitParamTypes != null) {
3252 try {
3253 bound = infer.instantiateFunctionalInterface(that,
3254 bound, explicitParamTypes, resultInfo.checkContext);
3255 } catch (FunctionDescriptorLookupError t) {
3256 // do nothing
3257 }
3258 }
3259 bound = types.removeWildcards(bound);
3260 components.add(bound);
3261 }
3262 currentTarget = types.makeIntersectionType(components.toList());
3263 currentTarget.tsym.flags_field |= INTERFACE;
3264 lambdaType = types.findDescriptorType(currentTarget);
3265 }
3266
3267 } else {
3268 currentTarget = Type.recoveryType;
3269 lambdaType = fallbackDescriptorType(that);
3270 }
3271 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3272 //lambda expression target desc cannot be a generic method
3273 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3274 kindName(currentTarget.tsym),
3275 currentTarget.tsym);
3276 resultInfo.checkContext.report(that, diags.fragment(msg));
3277 currentTarget = types.createErrorType(pt());
3278 }
3279 return new TargetInfo(currentTarget, lambdaType);
3280 }
3281
3282 void preFlow(JCLambda tree) {
3283 attrRecover.doRecovery();
3284 new PostAttrAnalyzer() {
3285 @Override
3286 public void scan(JCTree tree) {
3287 if (tree == null ||
3288 (tree.type != null &&
3289 tree.type == Type.stuckType)) {
3290 //don't touch stuck expressions!
3291 return;
3292 }
3293 super.scan(tree);
3294 }
3295
3296 @Override
3297 public void visitClassDef(JCClassDecl that) {
3298 // or class declaration trees!
3299 }
3300
3301 public void visitLambda(JCLambda that) {
3302 // or lambda expressions!
3303 }
3304 }.scan(tree.body);
3305 }
3306
3307 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3308
3309 @Override
3310 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3311 return t.isIntersection() ?
3312 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3313 }
3314
3315 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3316 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3317 return ict;
3318 }
3319
3320 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3321 ListBuffer<Type> targs = new ListBuffer<>();
3322 ListBuffer<Type> supertypes = new ListBuffer<>();
3323 for (Type i : ict.interfaces_field) {
3324 if (i.isParameterized()) {
3325 targs.appendList(i.tsym.type.allparams());
3326 }
3327 supertypes.append(i.tsym.type);
3328 }
3329 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3330 notionalIntf.allparams_field = targs.toList();
3331 notionalIntf.tsym.flags_field |= INTERFACE;
3332 return notionalIntf.tsym;
3333 }
3334 };
3335
3336 private Type fallbackDescriptorType(JCExpression tree) {
3337 switch (tree.getTag()) {
3338 case LAMBDA:
3339 JCLambda lambda = (JCLambda)tree;
3340 List<Type> argtypes = List.nil();
3341 for (JCVariableDecl param : lambda.params) {
3342 argtypes = param.vartype != null && param.vartype.type != null ?
3343 argtypes.append(param.vartype.type) :
3344 argtypes.append(syms.errType);
3345 }
3346 return new MethodType(argtypes, Type.recoveryType,
3347 List.of(syms.throwableType), syms.methodClass);
3348 case REFERENCE:
3349 return new MethodType(List.nil(), Type.recoveryType,
3350 List.of(syms.throwableType), syms.methodClass);
3351 default:
3352 Assert.error("Cannot get here!");
3353 }
3354 return null;
3355 }
3356
3357 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3358 final InferenceContext inferenceContext, final Type... ts) {
3359 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3360 }
3361
3362 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3363 final InferenceContext inferenceContext, final List<Type> ts) {
3364 if (inferenceContext.free(ts)) {
3365 inferenceContext.addFreeTypeListener(ts,
3366 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3367 } else {
3368 for (Type t : ts) {
3369 rs.checkAccessibleType(env, t);
3370 }
3371 }
3372 }
3373
3374 /**
3375 * Lambda/method reference have a special check context that ensures
3376 * that i.e. a lambda return type is compatible with the expected
3377 * type according to both the inherited context and the assignment
3378 * context.
3379 */
3380 class FunctionalReturnContext extends Check.NestedCheckContext {
3381
3382 FunctionalReturnContext(CheckContext enclosingContext) {
3383 super(enclosingContext);
3384 }
3385
3386 @Override
3387 public boolean compatible(Type found, Type req, Warner warn) {
3388 //return type must be compatible in both current context and assignment context
3389 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3390 }
3391
3392 @Override
3393 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3394 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3395 }
3396 }
3397
3398 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3399
3400 JCExpression expr;
3401 boolean expStmtExpected;
3402
3403 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3404 super(enclosingContext);
3405 this.expr = expr;
3406 }
3407
3408 @Override
3409 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3410 if (expStmtExpected) {
3411 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3412 } else {
3413 super.report(pos, details);
3414 }
3415 }
3416
3417 @Override
3418 public boolean compatible(Type found, Type req, Warner warn) {
3419 //a void return is compatible with an expression statement lambda
3420 if (req.hasTag(VOID)) {
3421 expStmtExpected = true;
3422 return TreeInfo.isExpressionStatement(expr);
3423 } else {
3424 return super.compatible(found, req, warn);
3425 }
3426 }
3427 }
3428
3429 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3430 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3431 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3432 new FunctionalReturnContext(resultInfo.checkContext);
3433
3434 return descriptor.getReturnType() == Type.recoveryType ?
3435 recoveryInfo :
3436 new ResultInfo(KindSelector.VAL,
3437 descriptor.getReturnType(), funcContext);
3438 }
3439
3440 /**
3441 * Lambda compatibility. Check that given return types, thrown types, parameter types
3442 * are compatible with the expected functional interface descriptor. This means that:
3443 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3444 * types must be compatible with the return type of the expected descriptor.
3445 */
3446 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3447 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3448
3449 //return values have already been checked - but if lambda has no return
3450 //values, we must ensure that void/value compatibility is correct;
3451 //this amounts at checking that, if a lambda body can complete normally,
3452 //the descriptor's return type must be void
3453 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3454 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3455 Fragment msg =
3456 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3457 checkContext.report(tree,
3458 diags.fragment(msg));
3459 }
3460
3461 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3462 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3463 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3464 }
3465 }
3466
3467 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3468 * static field and that lambda has type annotations, these annotations will
3469 * also be stored at these fake clinit methods.
3470 *
3471 * LambdaToMethod also use fake clinit methods so they can be reused.
3472 * Also as LTM is a phase subsequent to attribution, the methods from
3473 * clinits can be safely removed by LTM to save memory.
3474 */
3475 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3476
3477 public MethodSymbol removeClinit(ClassSymbol sym) {
3478 return clinits.remove(sym);
3479 }
3480
3481 /* This method returns an environment to be used to attribute a lambda
3482 * expression.
3483 *
3484 * The owner of this environment is a method symbol. If the current owner
3485 * is not a method, for example if the lambda is used to initialize
3486 * a field, then if the field is:
3487 *
3488 * - an instance field, we use the first constructor.
3489 * - a static field, we create a fake clinit method.
3490 */
3491 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3492 Env<AttrContext> lambdaEnv;
3493 Symbol owner = env.info.scope.owner;
3494 if (owner.kind == VAR && owner.owner.kind == TYP) {
3495 //field initializer
3496 ClassSymbol enclClass = owner.enclClass();
3497 Symbol newScopeOwner = env.info.scope.owner;
3498 /* if the field isn't static, then we can get the first constructor
3499 * and use it as the owner of the environment. This is what
3500 * LTM code is doing to look for type annotations so we are fine.
3501 */
3502 if ((owner.flags() & STATIC) == 0) {
3503 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3504 newScopeOwner = s;
3505 break;
3506 }
3507 } else {
3508 /* if the field is static then we need to create a fake clinit
3509 * method, this method can later be reused by LTM.
3510 */
3511 MethodSymbol clinit = clinits.get(enclClass);
3512 if (clinit == null) {
3513 Type clinitType = new MethodType(List.nil(),
3514 syms.voidType, List.nil(), syms.methodClass);
3515 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3516 names.clinit, clinitType, enclClass);
3517 clinit.params = List.nil();
3518 clinits.put(enclClass, clinit);
3519 }
3520 newScopeOwner = clinit;
3521 }
3522 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3523 } else {
3524 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3525 }
3526 lambdaEnv.info.yieldResult = null;
3527 lambdaEnv.info.isLambda = true;
3528 return lambdaEnv;
3529 }
3530
3531 @Override
3532 public void visitReference(final JCMemberReference that) {
3533 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3534 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3535 //method reference only allowed in assignment or method invocation/cast context
3536 log.error(that.pos(), Errors.UnexpectedMref);
3537 }
3538 result = that.type = types.createErrorType(pt());
3539 return;
3540 }
3541 final Env<AttrContext> localEnv = env.dup(that);
3542 try {
3543 //attribute member reference qualifier - if this is a constructor
3544 //reference, the expected kind must be a type
3545 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3546
3547 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3548 exprType = chk.checkConstructorRefType(that.expr, exprType);
3549 if (!exprType.isErroneous() &&
3550 exprType.isRaw() &&
3551 that.typeargs != null) {
3552 log.error(that.expr.pos(),
3553 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3554 Fragments.MrefInferAndExplicitParams));
3555 exprType = types.createErrorType(exprType);
3556 }
3557 }
3558
3559 if (exprType.isErroneous()) {
3560 //if the qualifier expression contains problems,
3561 //give up attribution of method reference
3562 result = that.type = exprType;
3563 return;
3564 }
3565
3566 if (TreeInfo.isStaticSelector(that.expr, names)) {
3567 //if the qualifier is a type, validate it; raw warning check is
3568 //omitted as we don't know at this stage as to whether this is a
3569 //raw selector (because of inference)
3570 chk.validate(that.expr, env, false);
3571 } else {
3572 Symbol lhsSym = TreeInfo.symbol(that.expr);
3573 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3574 }
3575 //attrib type-arguments
3576 List<Type> typeargtypes = List.nil();
3577 if (that.typeargs != null) {
3578 typeargtypes = attribTypes(that.typeargs, localEnv);
3579 }
3580
3581 boolean isTargetSerializable =
3582 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3583 isSerializable(pt());
3584 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3585 Type currentTarget = targetInfo.target;
3586 Type desc = targetInfo.descriptor;
3587
3588 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3589 List<Type> argtypes = desc.getParameterTypes();
3590 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3591
3592 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3593 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3594 }
3595
3596 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3597 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3598 try {
3599 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3600 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3601 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3602 } finally {
3603 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3604 }
3605
3606 Symbol refSym = refResult.fst;
3607 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3608
3609 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3610 * JDK-8075541
3611 */
3612 if (refSym.kind != MTH) {
3613 boolean targetError;
3614 switch (refSym.kind) {
3615 case ABSENT_MTH:
3616 case MISSING_ENCL:
3617 targetError = false;
3618 break;
3619 case WRONG_MTH:
3620 case WRONG_MTHS:
3621 case AMBIGUOUS:
3622 case HIDDEN:
3623 case STATICERR:
3624 targetError = true;
3625 break;
3626 default:
3627 Assert.error("unexpected result kind " + refSym.kind);
3628 targetError = false;
3629 }
3630
3631 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3632 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3633 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3634
3635 JCDiagnostic diag = diags.create(log.currentSource(), that,
3636 targetError ?
3637 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3638 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3639
3640 if (targetError && currentTarget == Type.recoveryType) {
3641 //a target error doesn't make sense during recovery stage
3642 //as we don't know what actual parameter types are
3643 result = that.type = currentTarget;
3644 return;
3645 } else {
3646 if (targetError) {
3647 resultInfo.checkContext.report(that, diag);
3648 } else {
3649 log.report(diag);
3650 }
3651 result = that.type = types.createErrorType(currentTarget);
3652 return;
3653 }
3654 }
3655
3656 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3657 that.kind = lookupHelper.referenceKind(that.sym);
3658 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3659
3660 if (desc.getReturnType() == Type.recoveryType) {
3661 // stop here
3662 result = that.type = currentTarget;
3663 return;
3664 }
3665
3666 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3667 Type enclosingType = exprType.getEnclosingType();
3668 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3669 // Check for the existence of an appropriate outer instance
3670 rs.resolveImplicitThis(that.pos(), env, exprType);
3671 }
3672 }
3673
3674 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3675
3676 if (that.getMode() == ReferenceMode.INVOKE &&
3677 TreeInfo.isStaticSelector(that.expr, names) &&
3678 that.kind.isUnbound() &&
3679 lookupHelper.site.isRaw()) {
3680 chk.checkRaw(that.expr, localEnv);
3681 }
3682
3683 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3684 exprType.getTypeArguments().nonEmpty()) {
3685 //static ref with class type-args
3686 log.error(that.expr.pos(),
3687 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3688 Fragments.StaticMrefWithTargs));
3689 result = that.type = types.createErrorType(currentTarget);
3690 return;
3691 }
3692
3693 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3694 // Check that super-qualified symbols are not abstract (JLS)
3695 rs.checkNonAbstract(that.pos(), that.sym);
3696 }
3697
3698 if (isTargetSerializable) {
3699 chk.checkAccessFromSerializableElement(that, true);
3700 }
3701 }
3702
3703 ResultInfo checkInfo =
3704 resultInfo.dup(newMethodTemplate(
3705 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3706 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3707 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3708
3709 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3710
3711 if (that.kind.isUnbound() &&
3712 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3713 //re-generate inference constraints for unbound receiver
3714 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3715 //cannot happen as this has already been checked - we just need
3716 //to regenerate the inference constraints, as that has been lost
3717 //as a result of the call to inferenceContext.save()
3718 Assert.error("Can't get here");
3719 }
3720 }
3721
3722 if (!refType.isErroneous()) {
3723 refType = types.createMethodTypeWithReturn(refType,
3724 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3725 }
3726
3727 //go ahead with standard method reference compatibility check - note that param check
3728 //is a no-op (as this has been taken care during method applicability)
3729 boolean isSpeculativeRound =
3730 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3731
3732 that.type = currentTarget; //avoids recovery at this stage
3733 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3734 if (!isSpeculativeRound) {
3735 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3736 }
3737 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3738 } catch (Types.FunctionDescriptorLookupError ex) {
3739 JCDiagnostic cause = ex.getDiagnostic();
3740 resultInfo.checkContext.report(that, cause);
3741 result = that.type = types.createErrorType(pt());
3742 return;
3743 }
3744 }
3745 //where
3746 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3747 //if this is a constructor reference, the expected kind must be a type
3748 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3749 KindSelector.VAL_TYP : KindSelector.TYP,
3750 Type.noType);
3751 }
3752
3753
3754 @SuppressWarnings("fallthrough")
3755 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3756 InferenceContext inferenceContext = checkContext.inferenceContext();
3757 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3758
3759 Type resType;
3760 switch (tree.getMode()) {
3761 case NEW:
3762 if (!tree.expr.type.isRaw()) {
3763 resType = tree.expr.type;
3764 break;
3765 }
3766 default:
3767 resType = refType.getReturnType();
3768 }
3769
3770 Type incompatibleReturnType = resType;
3771
3772 if (returnType.hasTag(VOID)) {
3773 incompatibleReturnType = null;
3774 }
3775
3776 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3777 if (resType.isErroneous() ||
3778 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3779 checkContext.checkWarner(tree, resType, returnType))) {
3780 incompatibleReturnType = null;
3781 }
3782 }
3783
3784 if (incompatibleReturnType != null) {
3785 Fragment msg =
3786 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3787 checkContext.report(tree, diags.fragment(msg));
3788 } else {
3789 if (inferenceContext.free(refType)) {
3790 // we need to wait for inference to finish and then replace inference vars in the referent type
3791 inferenceContext.addFreeTypeListener(List.of(refType),
3792 instantiatedContext -> {
3793 tree.referentType = instantiatedContext.asInstType(refType);
3794 });
3795 } else {
3796 tree.referentType = refType;
3797 }
3798 }
3799
3800 if (!speculativeAttr) {
3801 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3802 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3803 }
3804 }
3805 }
3806
3807 boolean checkExConstraints(
3808 List<Type> thrownByFuncExpr,
3809 List<Type> thrownAtFuncType,
3810 InferenceContext inferenceContext) {
3811 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3812 * are not proper types
3813 */
3814 List<Type> nonProperList = thrownAtFuncType.stream()
3815 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3816 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3817
3818 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3819 * in the throws clause of the invocation type of the method reference's compile-time
3820 * declaration
3821 */
3822 List<Type> checkedList = thrownByFuncExpr.stream()
3823 .filter(e -> chk.isChecked(e)).collect(List.collector());
3824
3825 /** If n = 0 (the function type's throws clause consists only of proper types), then
3826 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3827 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3828 * reduces to true
3829 */
3830 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3831 for (Type checked : checkedList) {
3832 boolean isSubtype = false;
3833 for (Type proper : properList) {
3834 if (types.isSubtype(checked, proper)) {
3835 isSubtype = true;
3836 break;
3837 }
3838 }
3839 if (!isSubtype) {
3840 uncaughtByProperTypes.add(checked);
3841 }
3842 }
3843
3844 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3845 return false;
3846 }
3847
3848 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3849 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3850 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3851 */
3852 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3853 uncaughtByProperTypes.forEach(checkedEx -> {
3854 nonProperAsUndet.forEach(nonProper -> {
3855 types.isSubtype(checkedEx, nonProper);
3856 });
3857 });
3858
3859 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3860 */
3861 nonProperAsUndet.stream()
3862 .filter(t -> t.hasTag(UNDETVAR))
3863 .forEach(t -> ((UndetVar)t).setThrow());
3864 return true;
3865 }
3866
3867 /**
3868 * Set functional type info on the underlying AST. Note: as the target descriptor
3869 * might contain inference variables, we might need to register an hook in the
3870 * current inference context.
3871 */
3872 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3873 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3874 if (checkContext.inferenceContext().free(descriptorType)) {
3875 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3876 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3877 inferenceContext.asInstType(primaryTarget), checkContext));
3878 } else {
3879 if (pt.hasTag(CLASS)) {
3880 fExpr.target = primaryTarget;
3881 }
3882 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3883 pt != Type.recoveryType) {
3884 //check that functional interface class is well-formed
3885 try {
3886 /* Types.makeFunctionalInterfaceClass() may throw an exception
3887 * when it's executed post-inference. See the listener code
3888 * above.
3889 */
3890 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3891 names.empty, fExpr.target, ABSTRACT);
3892 if (csym != null) {
3893 chk.checkImplementations(env.tree, csym, csym);
3894 try {
3895 //perform an additional functional interface check on the synthetic class,
3896 //as there may be spurious errors for raw targets - because of existing issues
3897 //with membership and inheritance (see JDK-8074570).
3898 csym.flags_field |= INTERFACE;
3899 types.findDescriptorType(csym.type);
3900 } catch (FunctionDescriptorLookupError err) {
3901 resultInfo.checkContext.report(fExpr,
3902 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3903 }
3904 }
3905 } catch (Types.FunctionDescriptorLookupError ex) {
3906 JCDiagnostic cause = ex.getDiagnostic();
3907 resultInfo.checkContext.report(env.tree, cause);
3908 }
3909 }
3910 }
3911 }
3912
3913 public void visitParens(JCParens tree) {
3914 Type owntype = attribTree(tree.expr, env, resultInfo);
3915 result = check(tree, owntype, pkind(), resultInfo);
3916 Symbol sym = TreeInfo.symbol(tree);
3917 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3918 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3919 }
3920
3921 public void visitAssign(JCAssign tree) {
3922 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3923 Type capturedType = capture(owntype);
3924 attribExpr(tree.rhs, env, owntype);
3925 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3926 }
3927
3928 public void visitAssignop(JCAssignOp tree) {
3929 // Attribute arguments.
3930 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3931 Type operand = attribExpr(tree.rhs, env);
3932 // Find operator.
3933 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3934 if (operator != operators.noOpSymbol &&
3935 !owntype.isErroneous() &&
3936 !operand.isErroneous()) {
3937 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3938 chk.checkCastable(tree.rhs.pos(),
3939 operator.type.getReturnType(),
3940 owntype);
3941 }
3942 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3943 }
3944
3945 public void visitUnary(JCUnary tree) {
3946 // Attribute arguments.
3947 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3948 ? attribTree(tree.arg, env, varAssignmentInfo)
3949 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3950
3951 // Find operator.
3952 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3953 Type owntype = types.createErrorType(tree.type);
3954 if (operator != operators.noOpSymbol &&
3955 !argtype.isErroneous()) {
3956 owntype = (tree.getTag().isIncOrDecUnaryOp())
3957 ? tree.arg.type
3958 : operator.type.getReturnType();
3959 int opc = ((OperatorSymbol)operator).opcode;
3960
3961 // If the argument is constant, fold it.
3962 if (argtype.constValue() != null) {
3963 Type ctype = cfolder.fold1(opc, argtype);
3964 if (ctype != null) {
3965 owntype = cfolder.coerce(ctype, owntype);
3966 }
3967 }
3968 }
3969 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3970 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
3971 }
3972
3973 public void visitBinary(JCBinary tree) {
3974 // Attribute arguments.
3975 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3976 // x && y
3977 // include x's bindings when true in y
3978
3979 // x || y
3980 // include x's bindings when false in y
3981
3982 MatchBindings lhsBindings = matchBindings;
3983 List<BindingSymbol> propagatedBindings;
3984 switch (tree.getTag()) {
3985 case AND:
3986 propagatedBindings = lhsBindings.bindingsWhenTrue;
3987 break;
3988 case OR:
3989 propagatedBindings = lhsBindings.bindingsWhenFalse;
3990 break;
3991 default:
3992 propagatedBindings = List.nil();
3993 break;
3994 }
3995 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
3996 Type right;
3997 try {
3998 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
3999 } finally {
4000 rhsEnv.info.scope.leave();
4001 }
4002
4003 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4004
4005 // Find operator.
4006 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4007 Type owntype = types.createErrorType(tree.type);
4008 if (operator != operators.noOpSymbol &&
4009 !left.isErroneous() &&
4010 !right.isErroneous()) {
4011 owntype = operator.type.getReturnType();
4012 int opc = ((OperatorSymbol)operator).opcode;
4013 // If both arguments are constants, fold them.
4014 if (left.constValue() != null && right.constValue() != null) {
4015 Type ctype = cfolder.fold2(opc, left, right);
4016 if (ctype != null) {
4017 owntype = cfolder.coerce(ctype, owntype);
4018 }
4019 }
4020
4021 // Check that argument types of a reference ==, != are
4022 // castable to each other, (JLS 15.21). Note: unboxing
4023 // comparisons will not have an acmp* opc at this point.
4024 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4025 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4026 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4027 }
4028 }
4029
4030 chk.checkDivZero(tree.rhs.pos(), operator, right);
4031 }
4032 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4033 }
4034
4035 public void visitTypeCast(final JCTypeCast tree) {
4036 Type clazztype = attribType(tree.clazz, env);
4037 chk.validate(tree.clazz, env, false);
4038 //a fresh environment is required for 292 inference to work properly ---
4039 //see Infer.instantiatePolymorphicSignatureInstance()
4040 Env<AttrContext> localEnv = env.dup(tree);
4041 //should we propagate the target type?
4042 final ResultInfo castInfo;
4043 JCExpression expr = TreeInfo.skipParens(tree.expr);
4044 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4045 if (isPoly) {
4046 //expression is a poly - we need to propagate target type info
4047 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4048 new Check.NestedCheckContext(resultInfo.checkContext) {
4049 @Override
4050 public boolean compatible(Type found, Type req, Warner warn) {
4051 return types.isCastable(found, req, warn);
4052 }
4053 });
4054 } else {
4055 //standalone cast - target-type info is not propagated
4056 castInfo = unknownExprInfo;
4057 }
4058 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4059 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4060 if (exprtype.constValue() != null)
4061 owntype = cfolder.coerce(exprtype, owntype);
4062 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4063 if (!isPoly)
4064 chk.checkRedundantCast(localEnv, tree);
4065 }
4066
4067 public void visitTypeTest(JCInstanceOf tree) {
4068 Type exprtype = chk.checkNullOrRefType(
4069 tree.expr.pos(), attribExpr(tree.expr, env));
4070 Type clazztype;
4071 JCTree typeTree;
4072 if (tree.pattern.getTag() == BINDINGPATTERN ||
4073 tree.pattern.getTag() == PARENTHESIZEDPATTERN) {
4074 attribTree(tree.pattern, env, unknownExprInfo);
4075 clazztype = tree.pattern.type;
4076 if (types.isSubtype(exprtype, clazztype) &&
4077 !exprtype.isErroneous() && !clazztype.isErroneous()) {
4078 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4079 }
4080 typeTree = TreeInfo.primaryPatternTree((JCPattern) tree.pattern).var.vartype;
4081 } else {
4082 clazztype = attribType(tree.pattern, env);
4083 typeTree = tree.pattern;
4084 chk.validate(typeTree, env, false);
4085 }
4086 if (!clazztype.hasTag(TYPEVAR)) {
4087 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4088 }
4089 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4090 boolean valid = false;
4091 if (allowReifiableTypesInInstanceof) {
4092 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4093 } else {
4094 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4095 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4096 allowReifiableTypesInInstanceof = true;
4097 }
4098 if (!valid) {
4099 clazztype = types.createErrorType(clazztype);
4100 }
4101 }
4102 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4103 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4104 }
4105
4106 private boolean checkCastablePattern(DiagnosticPosition pos,
4107 Type exprType,
4108 Type pattType) {
4109 Warner warner = new Warner();
4110 if (!types.isCastable(exprType, pattType, warner)) {
4111 chk.basicHandler.report(pos,
4112 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4113 return false;
4114 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4115 log.error(pos,
4116 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4117 return false;
4118 } else {
4119 return true;
4120 }
4121 }
4122
4123 public void visitBindingPattern(JCBindingPattern tree) {
4124 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
4125 tree.type = tree.var.type = attribTree(tree.var.vartype, env, varInfo);
4126 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, tree.var.vartype.type, env.info.scope.owner);
4127 v.pos = tree.pos;
4128 tree.var.sym = v;
4129 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4130 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4131 }
4132 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4133 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4134 annotate.flush();
4135 chk.validate(tree.var.vartype, env, true);
4136 result = tree.type;
4137 matchBindings = new MatchBindings(List.of(v), List.nil());
4138 }
4139
4140 @Override
4141 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4142 attribExpr(tree.pattern, env);
4143 result = tree.type = tree.pattern.type;
4144 }
4145
4146 @Override
4147 public void visitGuardPattern(JCGuardPattern tree) {
4148 attribExpr(tree.patt, env);
4149 MatchBindings afterPattern = matchBindings;
4150 Env<AttrContext> bodyEnv = bindingEnv(env, matchBindings.bindingsWhenTrue);
4151 try {
4152 attribExpr(tree.expr, bodyEnv, syms.booleanType);
4153 } finally {
4154 bodyEnv.info.scope.leave();
4155 }
4156 result = tree.type = tree.patt.type;
4157 matchBindings = matchBindingsComputer.guardedPattern(tree, afterPattern, matchBindings);
4158 }
4159
4160 public void visitIndexed(JCArrayAccess tree) {
4161 Type owntype = types.createErrorType(tree.type);
4162 Type atype = attribExpr(tree.indexed, env);
4163 attribExpr(tree.index, env, syms.intType);
4164 if (types.isArray(atype))
4165 owntype = types.elemtype(atype);
4166 else if (!atype.hasTag(ERROR))
4167 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4168 if (!pkind().contains(KindSelector.VAL))
4169 owntype = capture(owntype);
4170 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4171 }
4172
4173 public void visitIdent(JCIdent tree) {
4174 Symbol sym;
4175
4176 // Find symbol
4177 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4178 // If we are looking for a method, the prototype `pt' will be a
4179 // method type with the type of the call's arguments as parameters.
4180 env.info.pendingResolutionPhase = null;
4181 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4182 } else if (tree.sym != null && tree.sym.kind != VAR) {
4183 sym = tree.sym;
4184 } else {
4185 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4186 }
4187 tree.sym = sym;
4188
4189 // Also find the environment current for the class where
4190 // sym is defined (`symEnv').
4191 Env<AttrContext> symEnv = env;
4192 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4193 sym.kind.matches(KindSelector.VAL_MTH) &&
4194 sym.owner.kind == TYP &&
4195 tree.name != names._this && tree.name != names._super) {
4196
4197 // Find environment in which identifier is defined.
4198 while (symEnv.outer != null &&
4199 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4200 symEnv = symEnv.outer;
4201 }
4202 }
4203
4204 // If symbol is a variable, ...
4205 if (sym.kind == VAR) {
4206 VarSymbol v = (VarSymbol)sym;
4207
4208 // ..., evaluate its initializer, if it has one, and check for
4209 // illegal forward reference.
4210 checkInit(tree, env, v, false);
4211
4212 // If we are expecting a variable (as opposed to a value), check
4213 // that the variable is assignable in the current environment.
4214 if (KindSelector.ASG.subset(pkind()))
4215 checkAssignable(tree.pos(), v, null, env);
4216 }
4217
4218 // In a constructor body,
4219 // if symbol is a field or instance method, check that it is
4220 // not accessed before the supertype constructor is called.
4221 if (symEnv.info.isSelfCall &&
4222 sym.kind.matches(KindSelector.VAL_MTH) &&
4223 sym.owner.kind == TYP &&
4224 (sym.flags() & STATIC) == 0) {
4225 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4226 sym : thisSym(tree.pos(), env));
4227 }
4228 Env<AttrContext> env1 = env;
4229 if (sym.kind != ERR && sym.kind != TYP &&
4230 sym.owner != null && sym.owner != env1.enclClass.sym) {
4231 // If the found symbol is inaccessible, then it is
4232 // accessed through an enclosing instance. Locate this
4233 // enclosing instance:
4234 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4235 env1 = env1.outer;
4236 }
4237
4238 if (env.info.isSerializable) {
4239 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4240 }
4241
4242 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4243 }
4244
4245 public void visitSelect(JCFieldAccess tree) {
4246 // Determine the expected kind of the qualifier expression.
4247 KindSelector skind = KindSelector.NIL;
4248 if (tree.name == names._this || tree.name == names._super ||
4249 tree.name == names._class)
4250 {
4251 skind = KindSelector.TYP;
4252 } else {
4253 if (pkind().contains(KindSelector.PCK))
4254 skind = KindSelector.of(skind, KindSelector.PCK);
4255 if (pkind().contains(KindSelector.TYP))
4256 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4257 if (pkind().contains(KindSelector.VAL_MTH))
4258 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4259 }
4260
4261 // Attribute the qualifier expression, and determine its symbol (if any).
4262 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4263 if (!pkind().contains(KindSelector.TYP_PCK))
4264 site = capture(site); // Capture field access
4265
4266 // don't allow T.class T[].class, etc
4267 if (skind == KindSelector.TYP) {
4268 Type elt = site;
4269 while (elt.hasTag(ARRAY))
4270 elt = ((ArrayType)elt).elemtype;
4271 if (elt.hasTag(TYPEVAR)) {
4272 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4273 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4274 tree.sym = tree.type.tsym;
4275 return ;
4276 }
4277 }
4278
4279 // If qualifier symbol is a type or `super', assert `selectSuper'
4280 // for the selection. This is relevant for determining whether
4281 // protected symbols are accessible.
4282 Symbol sitesym = TreeInfo.symbol(tree.selected);
4283 boolean selectSuperPrev = env.info.selectSuper;
4284 env.info.selectSuper =
4285 sitesym != null &&
4286 sitesym.name == names._super;
4287
4288 // Determine the symbol represented by the selection.
4289 env.info.pendingResolutionPhase = null;
4290 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4291 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4292 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4293 sym = syms.errSymbol;
4294 }
4295 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4296 site = capture(site);
4297 sym = selectSym(tree, sitesym, site, env, resultInfo);
4298 }
4299 boolean varArgs = env.info.lastResolveVarargs();
4300 tree.sym = sym;
4301
4302 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4303 site = types.skipTypeVars(site, true);
4304 }
4305
4306 // If that symbol is a variable, ...
4307 if (sym.kind == VAR) {
4308 VarSymbol v = (VarSymbol)sym;
4309
4310 // ..., evaluate its initializer, if it has one, and check for
4311 // illegal forward reference.
4312 checkInit(tree, env, v, true);
4313
4314 // If we are expecting a variable (as opposed to a value), check
4315 // that the variable is assignable in the current environment.
4316 if (KindSelector.ASG.subset(pkind()))
4317 checkAssignable(tree.pos(), v, tree.selected, env);
4318 }
4319
4320 if (sitesym != null &&
4321 sitesym.kind == VAR &&
4322 ((VarSymbol)sitesym).isResourceVariable() &&
4323 sym.kind == MTH &&
4324 sym.name.equals(names.close) &&
4325 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4326 env.info.lint.isEnabled(LintCategory.TRY)) {
4327 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4328 }
4329
4330 // Disallow selecting a type from an expression
4331 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4332 tree.type = check(tree.selected, pt(),
4333 sitesym == null ?
4334 KindSelector.VAL : sitesym.kind.toSelector(),
4335 new ResultInfo(KindSelector.TYP_PCK, pt()));
4336 }
4337
4338 if (isType(sitesym)) {
4339 if (sym.name == names._this || sym.name == names._super) {
4340 // If `C' is the currently compiled class, check that
4341 // `C.this' does not appear in an explicit call to a constructor
4342 // also make sure that `super` is not used in constructor invocations
4343 if (env.info.isSelfCall &&
4344 ((sym.name == names._this &&
4345 site.tsym == env.enclClass.sym) ||
4346 sym.name == names._super && env.info.constructorArgs)) {
4347 chk.earlyRefError(tree.pos(), sym);
4348 }
4349 } else {
4350 // Check if type-qualified fields or methods are static (JLS)
4351 if ((sym.flags() & STATIC) == 0 &&
4352 sym.name != names._super &&
4353 (sym.kind == VAR || sym.kind == MTH)) {
4354 rs.accessBase(rs.new StaticError(sym),
4355 tree.pos(), site, sym.name, true);
4356 }
4357 }
4358 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
4359 sym.isStatic() && sym.kind == MTH) {
4360 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
4361 }
4362 } else if (sym.kind != ERR &&
4363 (sym.flags() & STATIC) != 0 &&
4364 sym.name != names._class) {
4365 // If the qualified item is not a type and the selected item is static, report
4366 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4367 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4368 }
4369
4370 // If we are selecting an instance member via a `super', ...
4371 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4372
4373 // Check that super-qualified symbols are not abstract (JLS)
4374 rs.checkNonAbstract(tree.pos(), sym);
4375
4376 if (site.isRaw()) {
4377 // Determine argument types for site.
4378 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4379 if (site1 != null) site = site1;
4380 }
4381 }
4382
4383 if (env.info.isSerializable) {
4384 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4385 }
4386
4387 env.info.selectSuper = selectSuperPrev;
4388 result = checkId(tree, site, sym, env, resultInfo);
4389 }
4390 //where
4391 /** Determine symbol referenced by a Select expression,
4392 *
4393 * @param tree The select tree.
4394 * @param site The type of the selected expression,
4395 * @param env The current environment.
4396 * @param resultInfo The current result.
4397 */
4398 private Symbol selectSym(JCFieldAccess tree,
4399 Symbol location,
4400 Type site,
4401 Env<AttrContext> env,
4402 ResultInfo resultInfo) {
4403 DiagnosticPosition pos = tree.pos();
4404 Name name = tree.name;
4405 switch (site.getTag()) {
4406 case PACKAGE:
4407 return rs.accessBase(
4408 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4409 pos, location, site, name, true);
4410 case ARRAY:
4411 case CLASS:
4412 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4413 return rs.resolveQualifiedMethod(
4414 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4415 } else if (name == names._this || name == names._super) {
4416 return rs.resolveSelf(pos, env, site.tsym, name);
4417 } else if (name == names._class) {
4418 // In this case, we have already made sure in
4419 // visitSelect that qualifier expression is a type.
4420 return syms.getClassField(site, types);
4421 } else {
4422 // We are seeing a plain identifier as selector.
4423 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4424 sym = rs.accessBase(sym, pos, location, site, name, true);
4425 return sym;
4426 }
4427 case WILDCARD:
4428 throw new AssertionError(tree);
4429 case TYPEVAR:
4430 // Normally, site.getUpperBound() shouldn't be null.
4431 // It should only happen during memberEnter/attribBase
4432 // when determining the super type which *must* be
4433 // done before attributing the type variables. In
4434 // other words, we are seeing this illegal program:
4435 // class B<T> extends A<T.foo> {}
4436 Symbol sym = (site.getUpperBound() != null)
4437 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4438 : null;
4439 if (sym == null) {
4440 log.error(pos, Errors.TypeVarCantBeDeref);
4441 return syms.errSymbol;
4442 } else {
4443 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4444 rs.new AccessError(env, site, sym) :
4445 sym;
4446 rs.accessBase(sym2, pos, location, site, name, true);
4447 return sym;
4448 }
4449 case ERROR:
4450 // preserve identifier names through errors
4451 return types.createErrorType(name, site.tsym, site).tsym;
4452 default:
4453 // The qualifier expression is of a primitive type -- only
4454 // .class is allowed for these.
4455 if (name == names._class) {
4456 // In this case, we have already made sure in Select that
4457 // qualifier expression is a type.
4458 return syms.getClassField(site, types);
4459 } else {
4460 log.error(pos, Errors.CantDeref(site));
4461 return syms.errSymbol;
4462 }
4463 }
4464 }
4465
4466 /** Determine type of identifier or select expression and check that
4467 * (1) the referenced symbol is not deprecated
4468 * (2) the symbol's type is safe (@see checkSafe)
4469 * (3) if symbol is a variable, check that its type and kind are
4470 * compatible with the prototype and protokind.
4471 * (4) if symbol is an instance field of a raw type,
4472 * which is being assigned to, issue an unchecked warning if its
4473 * type changes under erasure.
4474 * (5) if symbol is an instance method of a raw type, issue an
4475 * unchecked warning if its argument types change under erasure.
4476 * If checks succeed:
4477 * If symbol is a constant, return its constant type
4478 * else if symbol is a method, return its result type
4479 * otherwise return its type.
4480 * Otherwise return errType.
4481 *
4482 * @param tree The syntax tree representing the identifier
4483 * @param site If this is a select, the type of the selected
4484 * expression, otherwise the type of the current class.
4485 * @param sym The symbol representing the identifier.
4486 * @param env The current environment.
4487 * @param resultInfo The expected result
4488 */
4489 Type checkId(JCTree tree,
4490 Type site,
4491 Symbol sym,
4492 Env<AttrContext> env,
4493 ResultInfo resultInfo) {
4494 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4495 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4496 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4497 }
4498
4499 Type checkMethodIdInternal(JCTree tree,
4500 Type site,
4501 Symbol sym,
4502 Env<AttrContext> env,
4503 ResultInfo resultInfo) {
4504 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4505 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4506 } else {
4507 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4508 }
4509 }
4510
4511 Type checkIdInternal(JCTree tree,
4512 Type site,
4513 Symbol sym,
4514 Type pt,
4515 Env<AttrContext> env,
4516 ResultInfo resultInfo) {
4517 if (pt.isErroneous()) {
4518 return types.createErrorType(site);
4519 }
4520 Type owntype; // The computed type of this identifier occurrence.
4521 switch (sym.kind) {
4522 case TYP:
4523 // For types, the computed type equals the symbol's type,
4524 // except for two situations:
4525 owntype = sym.type;
4526 if (owntype.hasTag(CLASS)) {
4527 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4528 Type ownOuter = owntype.getEnclosingType();
4529
4530 // (a) If the symbol's type is parameterized, erase it
4531 // because no type parameters were given.
4532 // We recover generic outer type later in visitTypeApply.
4533 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4534 owntype = types.erasure(owntype);
4535 }
4536
4537 // (b) If the symbol's type is an inner class, then
4538 // we have to interpret its outer type as a superclass
4539 // of the site type. Example:
4540 //
4541 // class Tree<A> { class Visitor { ... } }
4542 // class PointTree extends Tree<Point> { ... }
4543 // ...PointTree.Visitor...
4544 //
4545 // Then the type of the last expression above is
4546 // Tree<Point>.Visitor.
4547 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4548 Type normOuter = site;
4549 if (normOuter.hasTag(CLASS)) {
4550 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4551 }
4552 if (normOuter == null) // perhaps from an import
4553 normOuter = types.erasure(ownOuter);
4554 if (normOuter != ownOuter)
4555 owntype = new ClassType(
4556 normOuter, List.nil(), owntype.tsym,
4557 owntype.getMetadata());
4558 }
4559 }
4560 break;
4561 case VAR:
4562 VarSymbol v = (VarSymbol)sym;
4563
4564 if (env.info.enclVar != null
4565 && v.type.hasTag(NONE)) {
4566 //self reference to implicitly typed variable declaration
4567 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4568 return v.type = types.createErrorType(v.type);
4569 }
4570
4571 // Test (4): if symbol is an instance field of a raw type,
4572 // which is being assigned to, issue an unchecked warning if
4573 // its type changes under erasure.
4574 if (KindSelector.ASG.subset(pkind()) &&
4575 v.owner.kind == TYP &&
4576 (v.flags() & STATIC) == 0 &&
4577 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4578 Type s = types.asOuterSuper(site, v.owner);
4579 if (s != null &&
4580 s.isRaw() &&
4581 !types.isSameType(v.type, v.erasure(types))) {
4582 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4583 }
4584 }
4585 // The computed type of a variable is the type of the
4586 // variable symbol, taken as a member of the site type.
4587 owntype = (sym.owner.kind == TYP &&
4588 sym.name != names._this && sym.name != names._super)
4589 ? types.memberType(site, sym)
4590 : sym.type;
4591
4592 // If the variable is a constant, record constant value in
4593 // computed type.
4594 if (v.getConstValue() != null && isStaticReference(tree))
4595 owntype = owntype.constType(v.getConstValue());
4596
4597 if (resultInfo.pkind == KindSelector.VAL) {
4598 owntype = capture(owntype); // capture "names as expressions"
4599 }
4600 break;
4601 case MTH: {
4602 owntype = checkMethod(site, sym,
4603 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4604 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4605 resultInfo.pt.getTypeArguments());
4606 break;
4607 }
4608 case PCK: case ERR:
4609 owntype = sym.type;
4610 break;
4611 default:
4612 throw new AssertionError("unexpected kind: " + sym.kind +
4613 " in tree " + tree);
4614 }
4615
4616 // Emit a `deprecation' warning if symbol is deprecated.
4617 // (for constructors (but not for constructor references), the error
4618 // was given when the constructor was resolved)
4619
4620 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4621 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4622 chk.checkSunAPI(tree.pos(), sym);
4623 chk.checkProfile(tree.pos(), sym);
4624 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4625 }
4626
4627 // If symbol is a variable, check that its type and
4628 // kind are compatible with the prototype and protokind.
4629 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4630 }
4631
4632 /** Check that variable is initialized and evaluate the variable's
4633 * initializer, if not yet done. Also check that variable is not
4634 * referenced before it is defined.
4635 * @param tree The tree making up the variable reference.
4636 * @param env The current environment.
4637 * @param v The variable's symbol.
4638 */
4639 private void checkInit(JCTree tree,
4640 Env<AttrContext> env,
4641 VarSymbol v,
4642 boolean onlyWarning) {
4643 // A forward reference is diagnosed if the declaration position
4644 // of the variable is greater than the current tree position
4645 // and the tree and variable definition occur in the same class
4646 // definition. Note that writes don't count as references.
4647 // This check applies only to class and instance
4648 // variables. Local variables follow different scope rules,
4649 // and are subject to definite assignment checking.
4650 Env<AttrContext> initEnv = enclosingInitEnv(env);
4651 if (initEnv != null &&
4652 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4653 v.owner.kind == TYP &&
4654 v.owner == env.info.scope.owner.enclClass() &&
4655 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4656 (!env.tree.hasTag(ASSIGN) ||
4657 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4658 if (!onlyWarning || isStaticEnumField(v)) {
4659 Error errkey = (initEnv.info.enclVar == v) ?
4660 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4661 log.error(tree.pos(), errkey);
4662 } else if (useBeforeDeclarationWarning) {
4663 Warning warnkey = (initEnv.info.enclVar == v) ?
4664 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4665 log.warning(tree.pos(), warnkey);
4666 }
4667 }
4668
4669 v.getConstValue(); // ensure initializer is evaluated
4670
4671 checkEnumInitializer(tree, env, v);
4672 }
4673
4674 /**
4675 * Returns the enclosing init environment associated with this env (if any). An init env
4676 * can be either a field declaration env or a static/instance initializer env.
4677 */
4678 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4679 while (true) {
4680 switch (env.tree.getTag()) {
4681 case VARDEF:
4682 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4683 if (vdecl.sym.owner.kind == TYP) {
4684 //field
4685 return env;
4686 }
4687 break;
4688 case BLOCK:
4689 if (env.next.tree.hasTag(CLASSDEF)) {
4690 //instance/static initializer
4691 return env;
4692 }
4693 break;
4694 case METHODDEF:
4695 case CLASSDEF:
4696 case TOPLEVEL:
4697 return null;
4698 }
4699 Assert.checkNonNull(env.next);
4700 env = env.next;
4701 }
4702 }
4703
4704 /**
4705 * Check for illegal references to static members of enum. In
4706 * an enum type, constructors and initializers may not
4707 * reference its static members unless they are constant.
4708 *
4709 * @param tree The tree making up the variable reference.
4710 * @param env The current environment.
4711 * @param v The variable's symbol.
4712 * @jls 8.9 Enum Types
4713 */
4714 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4715 // JLS:
4716 //
4717 // "It is a compile-time error to reference a static field
4718 // of an enum type that is not a compile-time constant
4719 // (15.28) from constructors, instance initializer blocks,
4720 // or instance variable initializer expressions of that
4721 // type. It is a compile-time error for the constructors,
4722 // instance initializer blocks, or instance variable
4723 // initializer expressions of an enum constant e to refer
4724 // to itself or to an enum constant of the same type that
4725 // is declared to the right of e."
4726 if (isStaticEnumField(v)) {
4727 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4728
4729 if (enclClass == null || enclClass.owner == null)
4730 return;
4731
4732 // See if the enclosing class is the enum (or a
4733 // subclass thereof) declaring v. If not, this
4734 // reference is OK.
4735 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4736 return;
4737
4738 // If the reference isn't from an initializer, then
4739 // the reference is OK.
4740 if (!Resolve.isInitializer(env))
4741 return;
4742
4743 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4744 }
4745 }
4746
4747 /** Is the given symbol a static, non-constant field of an Enum?
4748 * Note: enum literals should not be regarded as such
4749 */
4750 private boolean isStaticEnumField(VarSymbol v) {
4751 return Flags.isEnum(v.owner) &&
4752 Flags.isStatic(v) &&
4753 !Flags.isConstant(v) &&
4754 v.name != names._class;
4755 }
4756
4757 /**
4758 * Check that method arguments conform to its instantiation.
4759 **/
4760 public Type checkMethod(Type site,
4761 final Symbol sym,
4762 ResultInfo resultInfo,
4763 Env<AttrContext> env,
4764 final List<JCExpression> argtrees,
4765 List<Type> argtypes,
4766 List<Type> typeargtypes) {
4767 // Test (5): if symbol is an instance method of a raw type, issue
4768 // an unchecked warning if its argument types change under erasure.
4769 if ((sym.flags() & STATIC) == 0 &&
4770 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4771 Type s = types.asOuterSuper(site, sym.owner);
4772 if (s != null && s.isRaw() &&
4773 !types.isSameTypes(sym.type.getParameterTypes(),
4774 sym.erasure(types).getParameterTypes())) {
4775 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4776 }
4777 }
4778
4779 if (env.info.defaultSuperCallSite != null) {
4780 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4781 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4782 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4783 List<MethodSymbol> icand_sup =
4784 types.interfaceCandidates(sup, (MethodSymbol)sym);
4785 if (icand_sup.nonEmpty() &&
4786 icand_sup.head != sym &&
4787 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4788 log.error(env.tree.pos(),
4789 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4790 break;
4791 }
4792 }
4793 env.info.defaultSuperCallSite = null;
4794 }
4795
4796 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4797 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4798 if (app.meth.hasTag(SELECT) &&
4799 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4800 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4801 }
4802 }
4803
4804 // Compute the identifier's instantiated type.
4805 // For methods, we need to compute the instance type by
4806 // Resolve.instantiate from the symbol's type as well as
4807 // any type arguments and value arguments.
4808 Warner noteWarner = new Warner();
4809 try {
4810 Type owntype = rs.checkMethod(
4811 env,
4812 site,
4813 sym,
4814 resultInfo,
4815 argtypes,
4816 typeargtypes,
4817 noteWarner);
4818
4819 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4820 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4821
4822 argtypes = argtypes.map(checkDeferredMap);
4823
4824 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4825 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4826 sym.name,
4827 rs.methodArguments(sym.type.getParameterTypes()),
4828 rs.methodArguments(argtypes.map(checkDeferredMap)),
4829 kindName(sym.location()),
4830 sym.location()));
4831 if (resultInfo.pt != Infer.anyPoly ||
4832 !owntype.hasTag(METHOD) ||
4833 !owntype.isPartial()) {
4834 //if this is not a partially inferred method type, erase return type. Otherwise,
4835 //erasure is carried out in PartiallyInferredMethodType.check().
4836 owntype = new MethodType(owntype.getParameterTypes(),
4837 types.erasure(owntype.getReturnType()),
4838 types.erasure(owntype.getThrownTypes()),
4839 syms.methodClass);
4840 }
4841 }
4842
4843 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4844 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4845 PolyKind.POLY : PolyKind.STANDALONE;
4846 TreeInfo.setPolyKind(env.tree, pkind);
4847
4848 return (resultInfo.pt == Infer.anyPoly) ?
4849 owntype :
4850 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4851 resultInfo.checkContext.inferenceContext());
4852 } catch (Infer.InferenceException ex) {
4853 //invalid target type - propagate exception outwards or report error
4854 //depending on the current check context
4855 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4856 return types.createErrorType(site);
4857 } catch (Resolve.InapplicableMethodException ex) {
4858 final JCDiagnostic diag = ex.getDiagnostic();
4859 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4860 @Override
4861 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4862 return new Pair<>(sym, diag);
4863 }
4864 };
4865 List<Type> argtypes2 = argtypes.map(
4866 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4867 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4868 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4869 log.report(errDiag);
4870 return types.createErrorType(site);
4871 }
4872 }
4873
4874 public void visitLiteral(JCLiteral tree) {
4875 result = check(tree, litType(tree.typetag).constType(tree.value),
4876 KindSelector.VAL, resultInfo);
4877 }
4878 //where
4879 /** Return the type of a literal with given type tag.
4880 */
4881 Type litType(TypeTag tag) {
4882 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4883 }
4884
4885 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
4886 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
4887 }
4888
4889 public void visitTypeArray(JCArrayTypeTree tree) {
4890 Type etype = attribType(tree.elemtype, env);
4891 Type type = new ArrayType(etype, syms.arrayClass);
4892 result = check(tree, type, KindSelector.TYP, resultInfo);
4893 }
4894
4895 /** Visitor method for parameterized types.
4896 * Bound checking is left until later, since types are attributed
4897 * before supertype structure is completely known
4898 */
4899 public void visitTypeApply(JCTypeApply tree) {
4900 Type owntype = types.createErrorType(tree.type);
4901
4902 // Attribute functor part of application and make sure it's a class.
4903 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
4904
4905 // Attribute type parameters
4906 List<Type> actuals = attribTypes(tree.arguments, env);
4907
4908 if (clazztype.hasTag(CLASS)) {
4909 List<Type> formals = clazztype.tsym.type.getTypeArguments();
4910 if (actuals.isEmpty()) //diamond
4911 actuals = formals;
4912
4913 if (actuals.length() == formals.length()) {
4914 List<Type> a = actuals;
4915 List<Type> f = formals;
4916 while (a.nonEmpty()) {
4917 a.head = a.head.withTypeVar(f.head);
4918 a = a.tail;
4919 f = f.tail;
4920 }
4921 // Compute the proper generic outer
4922 Type clazzOuter = clazztype.getEnclosingType();
4923 if (clazzOuter.hasTag(CLASS)) {
4924 Type site;
4925 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
4926 if (clazz.hasTag(IDENT)) {
4927 site = env.enclClass.sym.type;
4928 } else if (clazz.hasTag(SELECT)) {
4929 site = ((JCFieldAccess) clazz).selected.type;
4930 } else throw new AssertionError(""+tree);
4931 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
4932 if (site.hasTag(CLASS))
4933 site = types.asOuterSuper(site, clazzOuter.tsym);
4934 if (site == null)
4935 site = types.erasure(clazzOuter);
4936 clazzOuter = site;
4937 }
4938 }
4939 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
4940 clazztype.getMetadata());
4941 } else {
4942 if (formals.length() != 0) {
4943 log.error(tree.pos(),
4944 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
4945 } else {
4946 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
4947 }
4948 owntype = types.createErrorType(tree.type);
4949 }
4950 }
4951 result = check(tree, owntype, KindSelector.TYP, resultInfo);
4952 }
4953
4954 public void visitTypeUnion(JCTypeUnion tree) {
4955 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
4956 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
4957 for (JCExpression typeTree : tree.alternatives) {
4958 Type ctype = attribType(typeTree, env);
4959 ctype = chk.checkType(typeTree.pos(),
4960 chk.checkClassType(typeTree.pos(), ctype),
4961 syms.throwableType);
4962 if (!ctype.isErroneous()) {
4963 //check that alternatives of a union type are pairwise
4964 //unrelated w.r.t. subtyping
4965 if (chk.intersects(ctype, multicatchTypes.toList())) {
4966 for (Type t : multicatchTypes) {
4967 boolean sub = types.isSubtype(ctype, t);
4968 boolean sup = types.isSubtype(t, ctype);
4969 if (sub || sup) {
4970 //assume 'a' <: 'b'
4971 Type a = sub ? ctype : t;
4972 Type b = sub ? t : ctype;
4973 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
4974 }
4975 }
4976 }
4977 multicatchTypes.append(ctype);
4978 if (all_multicatchTypes != null)
4979 all_multicatchTypes.append(ctype);
4980 } else {
4981 if (all_multicatchTypes == null) {
4982 all_multicatchTypes = new ListBuffer<>();
4983 all_multicatchTypes.appendList(multicatchTypes);
4984 }
4985 all_multicatchTypes.append(ctype);
4986 }
4987 }
4988 Type t = check(tree, types.lub(multicatchTypes.toList()),
4989 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
4990 if (t.hasTag(CLASS)) {
4991 List<Type> alternatives =
4992 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
4993 t = new UnionClassType((ClassType) t, alternatives);
4994 }
4995 tree.type = result = t;
4996 }
4997
4998 public void visitTypeIntersection(JCTypeIntersection tree) {
4999 attribTypes(tree.bounds, env);
5000 tree.type = result = checkIntersection(tree, tree.bounds);
5001 }
5002
5003 public void visitTypeParameter(JCTypeParameter tree) {
5004 TypeVar typeVar = (TypeVar) tree.type;
5005
5006 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5007 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5008 }
5009
5010 if (!typeVar.getUpperBound().isErroneous()) {
5011 //fixup type-parameter bound computed in 'attribTypeVariables'
5012 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5013 }
5014 }
5015
5016 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5017 Set<Type> boundSet = new HashSet<>();
5018 if (bounds.nonEmpty()) {
5019 // accept class or interface or typevar as first bound.
5020 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5021 boundSet.add(types.erasure(bounds.head.type));
5022 if (bounds.head.type.isErroneous()) {
5023 return bounds.head.type;
5024 }
5025 else if (bounds.head.type.hasTag(TYPEVAR)) {
5026 // if first bound was a typevar, do not accept further bounds.
5027 if (bounds.tail.nonEmpty()) {
5028 log.error(bounds.tail.head.pos(),
5029 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5030 return bounds.head.type;
5031 }
5032 } else {
5033 // if first bound was a class or interface, accept only interfaces
5034 // as further bounds.
5035 for (JCExpression bound : bounds.tail) {
5036 bound.type = checkBase(bound.type, bound, env, false, true, false);
5037 if (bound.type.isErroneous()) {
5038 bounds = List.of(bound);
5039 }
5040 else if (bound.type.hasTag(CLASS)) {
5041 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5042 }
5043 }
5044 }
5045 }
5046
5047 if (bounds.length() == 0) {
5048 return syms.objectType;
5049 } else if (bounds.length() == 1) {
5050 return bounds.head.type;
5051 } else {
5052 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5053 // ... the variable's bound is a class type flagged COMPOUND
5054 // (see comment for TypeVar.bound).
5055 // In this case, generate a class tree that represents the
5056 // bound class, ...
5057 JCExpression extending;
5058 List<JCExpression> implementing;
5059 if (!bounds.head.type.isInterface()) {
5060 extending = bounds.head;
5061 implementing = bounds.tail;
5062 } else {
5063 extending = null;
5064 implementing = bounds;
5065 }
5066 JCClassDecl cd = make.at(tree).ClassDef(
5067 make.Modifiers(PUBLIC | ABSTRACT),
5068 names.empty, List.nil(),
5069 extending, implementing, List.nil());
5070
5071 ClassSymbol c = (ClassSymbol)owntype.tsym;
5072 Assert.check((c.flags() & COMPOUND) != 0);
5073 cd.sym = c;
5074 c.sourcefile = env.toplevel.sourcefile;
5075
5076 // ... and attribute the bound class
5077 c.flags_field |= UNATTRIBUTED;
5078 Env<AttrContext> cenv = enter.classEnv(cd, env);
5079 typeEnvs.put(c, cenv);
5080 attribClass(c);
5081 return owntype;
5082 }
5083 }
5084
5085 public void visitWildcard(JCWildcard tree) {
5086 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5087 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5088 ? syms.objectType
5089 : attribType(tree.inner, env);
5090 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5091 tree.kind.kind,
5092 syms.boundClass),
5093 KindSelector.TYP, resultInfo);
5094 }
5095
5096 public void visitAnnotation(JCAnnotation tree) {
5097 Assert.error("should be handled in annotate");
5098 }
5099
5100 public void visitAnnotatedType(JCAnnotatedType tree) {
5101 attribAnnotationTypes(tree.annotations, env);
5102 Type underlyingType = attribType(tree.underlyingType, env);
5103 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5104
5105 if (!env.info.isNewClass)
5106 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5107 result = tree.type = annotatedType;
5108 }
5109
5110 public void visitErroneous(JCErroneous tree) {
5111 if (tree.errs != null) {
5112 Env<AttrContext> errEnv = env.dup(env.tree);
5113 errEnv.info.returnResult = unknownExprInfo;
5114 for (JCTree err : tree.errs)
5115 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5116 }
5117 result = tree.type = syms.errType;
5118 }
5119
5120 /** Default visitor method for all other trees.
5121 */
5122 public void visitTree(JCTree tree) {
5123 throw new AssertionError();
5124 }
5125
5126 /**
5127 * Attribute an env for either a top level tree or class or module declaration.
5128 */
5129 public void attrib(Env<AttrContext> env) {
5130 switch (env.tree.getTag()) {
5131 case MODULEDEF:
5132 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5133 break;
5134 case TOPLEVEL:
5135 attribTopLevel(env);
5136 break;
5137 case PACKAGEDEF:
5138 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5139 break;
5140 default:
5141 attribClass(env.tree.pos(), env.enclClass.sym);
5142 }
5143 }
5144
5145 /**
5146 * Attribute a top level tree. These trees are encountered when the
5147 * package declaration has annotations.
5148 */
5149 public void attribTopLevel(Env<AttrContext> env) {
5150 JCCompilationUnit toplevel = env.toplevel;
5151 try {
5152 annotate.flush();
5153 } catch (CompletionFailure ex) {
5154 chk.completionError(toplevel.pos(), ex);
5155 }
5156 }
5157
5158 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5159 try {
5160 annotate.flush();
5161 attribPackage(p);
5162 } catch (CompletionFailure ex) {
5163 chk.completionError(pos, ex);
5164 }
5165 }
5166
5167 void attribPackage(PackageSymbol p) {
5168 Env<AttrContext> env = typeEnvs.get(p);
5169 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
5170 }
5171
5172 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5173 try {
5174 annotate.flush();
5175 attribModule(m);
5176 } catch (CompletionFailure ex) {
5177 chk.completionError(pos, ex);
5178 }
5179 }
5180
5181 void attribModule(ModuleSymbol m) {
5182 // Get environment current at the point of module definition.
5183 Env<AttrContext> env = enter.typeEnvs.get(m);
5184 attribStat(env.tree, env);
5185 }
5186
5187 /** Main method: attribute class definition associated with given class symbol.
5188 * reporting completion failures at the given position.
5189 * @param pos The source position at which completion errors are to be
5190 * reported.
5191 * @param c The class symbol whose definition will be attributed.
5192 */
5193 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5194 try {
5195 annotate.flush();
5196 attribClass(c);
5197 } catch (CompletionFailure ex) {
5198 chk.completionError(pos, ex);
5199 }
5200 }
5201
5202 /** Attribute class definition associated with given class symbol.
5203 * @param c The class symbol whose definition will be attributed.
5204 */
5205 void attribClass(ClassSymbol c) throws CompletionFailure {
5206 if (c.type.hasTag(ERROR)) return;
5207
5208 // Check for cycles in the inheritance graph, which can arise from
5209 // ill-formed class files.
5210 chk.checkNonCyclic(null, c.type);
5211
5212 Type st = types.supertype(c.type);
5213 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5214 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5215 // First, attribute superclass.
5216 if (st.hasTag(CLASS))
5217 attribClass((ClassSymbol)st.tsym);
5218
5219 // Next attribute owner, if it is a class.
5220 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5221 attribClass((ClassSymbol)c.owner);
5222
5223 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5224 }
5225
5226 // The previous operations might have attributed the current class
5227 // if there was a cycle. So we test first whether the class is still
5228 // UNATTRIBUTED.
5229 if ((c.flags_field & UNATTRIBUTED) != 0) {
5230 c.flags_field &= ~UNATTRIBUTED;
5231
5232 // Get environment current at the point of class definition.
5233 Env<AttrContext> env = typeEnvs.get(c);
5234
5235 if (c.isSealed() &&
5236 !c.isEnum() &&
5237 !c.isPermittedExplicit &&
5238 c.permitted.isEmpty()) {
5239 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5240 }
5241
5242 if (c.isSealed()) {
5243 Set<Symbol> permittedTypes = new HashSet<>();
5244 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5245 for (Symbol subTypeSym : c.permitted) {
5246 boolean isTypeVar = false;
5247 if (subTypeSym.type.getTag() == TYPEVAR) {
5248 isTypeVar = true; //error recovery
5249 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5250 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5251 }
5252 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5253 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5254 }
5255 if (permittedTypes.contains(subTypeSym)) {
5256 DiagnosticPosition pos =
5257 env.enclClass.permitting.stream()
5258 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5259 .limit(2).collect(List.collector()).get(1);
5260 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5261 } else {
5262 permittedTypes.add(subTypeSym);
5263 }
5264 if (sealedInUnnamed) {
5265 if (subTypeSym.packge() != c.packge()) {
5266 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5267 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5268 );
5269 }
5270 } else if (subTypeSym.packge().modle != c.packge().modle) {
5271 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5272 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5273 );
5274 }
5275 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5276 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5277 Errors.InvalidPermitsClause(
5278 subTypeSym == c.type.tsym ?
5279 Fragments.MustNotBeSameClass :
5280 Fragments.MustNotBeSupertype(subTypeSym.type)
5281 )
5282 );
5283 } else if (!isTypeVar) {
5284 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5285 .stream()
5286 .anyMatch(d -> d.tsym == c);
5287 if (!thisIsASuper) {
5288 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5289 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5290 }
5291 }
5292 }
5293 }
5294
5295 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5296 .stream()
5297 .filter(s -> s.tsym.isSealed())
5298 .map(s -> (ClassSymbol) s.tsym)
5299 .collect(List.collector());
5300
5301 if (sealedSupers.isEmpty()) {
5302 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5303 boolean hasErrorSuper = false;
5304
5305 hasErrorSuper |= types.directSupertypes(c.type)
5306 .stream()
5307 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5308
5309 ClassType ct = (ClassType) c.type;
5310
5311 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5312
5313 if (!hasErrorSuper) {
5314 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5315 }
5316 }
5317 } else {
5318 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5319 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5320 }
5321
5322 if (!c.type.isCompound()) {
5323 for (ClassSymbol supertypeSym : sealedSupers) {
5324 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5325 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5326 }
5327 }
5328 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5329 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5330 c.isInterface() ?
5331 Errors.NonSealedOrSealedExpected :
5332 Errors.NonSealedSealedOrFinalExpected);
5333 }
5334 }
5335 }
5336
5337 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5338 // because the annotations were not available at the time the env was created. Therefore,
5339 // we look up the environment chain for the first enclosing environment for which the
5340 // lint value is set. Typically, this is the parent env, but might be further if there
5341 // are any envs created as a result of TypeParameter nodes.
5342 Env<AttrContext> lintEnv = env;
5343 while (lintEnv.info.lint == null)
5344 lintEnv = lintEnv.next;
5345
5346 // Having found the enclosing lint value, we can initialize the lint value for this class
5347 env.info.lint = lintEnv.info.lint.augment(c);
5348
5349 Lint prevLint = chk.setLint(env.info.lint);
5350 JavaFileObject prev = log.useSource(c.sourcefile);
5351 ResultInfo prevReturnRes = env.info.returnResult;
5352
5353 try {
5354 deferredLintHandler.flush(env.tree);
5355 env.info.returnResult = null;
5356 // java.lang.Enum may not be subclassed by a non-enum
5357 if (st.tsym == syms.enumSym &&
5358 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5359 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5360
5361 // Enums may not be extended by source-level classes
5362 if (st.tsym != null &&
5363 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5364 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5365 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5366 }
5367
5368 if (isSerializable(c.type)) {
5369 env.info.isSerializable = true;
5370 }
5371
5372 attribClassBody(env, c);
5373
5374 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5375 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5376 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5377 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5378 } finally {
5379 env.info.returnResult = prevReturnRes;
5380 log.useSource(prev);
5381 chk.setLint(prevLint);
5382 }
5383
5384 }
5385 }
5386
5387 public void visitImport(JCImport tree) {
5388 // nothing to do
5389 }
5390
5391 public void visitModuleDef(JCModuleDecl tree) {
5392 tree.sym.completeUsesProvides();
5393 ModuleSymbol msym = tree.sym;
5394 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5395 Lint prevLint = chk.setLint(lint);
5396 chk.checkModuleName(tree);
5397 chk.checkDeprecatedAnnotation(tree, msym);
5398
5399 try {
5400 deferredLintHandler.flush(tree.pos());
5401 } finally {
5402 chk.setLint(prevLint);
5403 }
5404 }
5405
5406 /** Finish the attribution of a class. */
5407 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5408 JCClassDecl tree = (JCClassDecl)env.tree;
5409 Assert.check(c == tree.sym);
5410
5411 // Validate type parameters, supertype and interfaces.
5412 attribStats(tree.typarams, env);
5413 if (!c.isAnonymous()) {
5414 //already checked if anonymous
5415 chk.validate(tree.typarams, env);
5416 chk.validate(tree.extending, env);
5417 chk.validate(tree.implementing, env);
5418 }
5419
5420 c.markAbstractIfNeeded(types);
5421
5422 // If this is a non-abstract class, check that it has no abstract
5423 // methods or unimplemented methods of an implemented interface.
5424 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5425 chk.checkAllDefined(tree.pos(), c);
5426 }
5427
5428 if ((c.flags() & ANNOTATION) != 0) {
5429 if (tree.implementing.nonEmpty())
5430 log.error(tree.implementing.head.pos(),
5431 Errors.CantExtendIntfAnnotation);
5432 if (tree.typarams.nonEmpty()) {
5433 log.error(tree.typarams.head.pos(),
5434 Errors.IntfAnnotationCantHaveTypeParams(c));
5435 }
5436
5437 // If this annotation type has a @Repeatable, validate
5438 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5439 // If this annotation type has a @Repeatable, validate
5440 if (repeatable != null) {
5441 // get diagnostic position for error reporting
5442 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5443 Assert.checkNonNull(cbPos);
5444
5445 chk.validateRepeatable(c, repeatable, cbPos);
5446 }
5447 } else {
5448 // Check that all extended classes and interfaces
5449 // are compatible (i.e. no two define methods with same arguments
5450 // yet different return types). (JLS 8.4.6.3)
5451 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5452 if (allowDefaultMethods) {
5453 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5454 }
5455 }
5456
5457 // Check that class does not import the same parameterized interface
5458 // with two different argument lists.
5459 chk.checkClassBounds(tree.pos(), c.type);
5460
5461 tree.type = c.type;
5462
5463 for (List<JCTypeParameter> l = tree.typarams;
5464 l.nonEmpty(); l = l.tail) {
5465 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5466 }
5467
5468 // Check that a generic class doesn't extend Throwable
5469 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5470 log.error(tree.extending.pos(), Errors.GenericThrowable);
5471
5472 // Check that all methods which implement some
5473 // method conform to the method they implement.
5474 chk.checkImplementations(tree);
5475
5476 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5477 checkAutoCloseable(tree.pos(), env, c.type);
5478
5479 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5480 // Attribute declaration
5481 attribStat(l.head, env);
5482 // Check that declarations in inner classes are not static (JLS 8.1.2)
5483 // Make an exception for static constants.
5484 if (!allowRecords &&
5485 c.owner.kind != PCK &&
5486 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5487 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5488 Symbol sym = null;
5489 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5490 if (sym == null ||
5491 sym.kind != VAR ||
5492 ((VarSymbol) sym).getConstValue() == null)
5493 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5494 }
5495 }
5496
5497 // Check for cycles among non-initial constructors.
5498 chk.checkCyclicConstructors(tree);
5499
5500 // Check for cycles among annotation elements.
5501 chk.checkNonCyclicElements(tree);
5502
5503 // Check for proper use of serialVersionUID
5504 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5505 && isSerializable(c.type)
5506 && (c.flags() & (Flags.ENUM | Flags.INTERFACE)) == 0
5507 && !c.isAnonymous()) {
5508 checkSerialVersionUID(tree, c, env);
5509 }
5510 if (allowTypeAnnos) {
5511 // Correctly organize the positions of the type annotations
5512 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5513
5514 // Check type annotations applicability rules
5515 validateTypeAnnotations(tree, false);
5516 }
5517 }
5518 // where
5519 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5520 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5521 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5522 if (types.isSameType(al.head.annotationType.type, t))
5523 return al.head.pos();
5524 }
5525
5526 return null;
5527 }
5528
5529 /** check if a type is a subtype of Serializable, if that is available. */
5530 boolean isSerializable(Type t) {
5531 try {
5532 syms.serializableType.complete();
5533 }
5534 catch (CompletionFailure e) {
5535 return false;
5536 }
5537 return types.isSubtype(t, syms.serializableType);
5538 }
5539
5540 /** Check that an appropriate serialVersionUID member is defined. */
5541 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c, Env<AttrContext> env) {
5542
5543 // check for presence of serialVersionUID
5544 VarSymbol svuid = null;
5545 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) {
5546 if (sym.kind == VAR) {
5547 svuid = (VarSymbol)sym;
5548 break;
5549 }
5550 }
5551
5552 if (svuid == null) {
5553 if (!c.isRecord())
5554 log.warning(LintCategory.SERIAL, tree.pos(), Warnings.MissingSVUID(c));
5555 return;
5556 }
5557
5558 // Check if @SuppressWarnings("serial") is an annotation of serialVersionUID.
5559 // See JDK-8231622 for more information.
5560 Lint lint = env.info.lint.augment(svuid);
5561 if (lint.isSuppressed(LintCategory.SERIAL)) {
5562 return;
5563 }
5564
5565 // check that it is static final
5566 if ((svuid.flags() & (STATIC | FINAL)) !=
5567 (STATIC | FINAL))
5568 log.warning(LintCategory.SERIAL,
5569 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c));
5570
5571 // check that it is long
5572 else if (!svuid.type.hasTag(LONG))
5573 log.warning(LintCategory.SERIAL,
5574 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c));
5575
5576 // check constant
5577 else if (svuid.getConstValue() == null)
5578 log.warning(LintCategory.SERIAL,
5579 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c));
5580 }
5581
5582 private Type capture(Type type) {
5583 return types.capture(type);
5584 }
5585
5586 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5587 if (type.isErroneous()) {
5588 tree.vartype = make.at(Position.NOPOS).Erroneous();
5589 } else {
5590 tree.vartype = make.at(Position.NOPOS).Type(type);
5591 }
5592 }
5593
5594 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5595 tree.accept(new TypeAnnotationsValidator(sigOnly));
5596 }
5597 //where
5598 private final class TypeAnnotationsValidator extends TreeScanner {
5599
5600 private final boolean sigOnly;
5601 public TypeAnnotationsValidator(boolean sigOnly) {
5602 this.sigOnly = sigOnly;
5603 }
5604
5605 public void visitAnnotation(JCAnnotation tree) {
5606 chk.validateTypeAnnotation(tree, false);
5607 super.visitAnnotation(tree);
5608 }
5609 public void visitAnnotatedType(JCAnnotatedType tree) {
5610 if (!tree.underlyingType.type.isErroneous()) {
5611 super.visitAnnotatedType(tree);
5612 }
5613 }
5614 public void visitTypeParameter(JCTypeParameter tree) {
5615 chk.validateTypeAnnotations(tree.annotations, true);
5616 scan(tree.bounds);
5617 // Don't call super.
5618 // This is needed because above we call validateTypeAnnotation with
5619 // false, which would forbid annotations on type parameters.
5620 // super.visitTypeParameter(tree);
5621 }
5622 public void visitMethodDef(JCMethodDecl tree) {
5623 if (tree.recvparam != null &&
5624 !tree.recvparam.vartype.type.isErroneous()) {
5625 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5626 }
5627 if (tree.restype != null && tree.restype.type != null) {
5628 validateAnnotatedType(tree.restype, tree.restype.type);
5629 }
5630 if (sigOnly) {
5631 scan(tree.mods);
5632 scan(tree.restype);
5633 scan(tree.typarams);
5634 scan(tree.recvparam);
5635 scan(tree.params);
5636 scan(tree.thrown);
5637 } else {
5638 scan(tree.defaultValue);
5639 scan(tree.body);
5640 }
5641 }
5642 public void visitVarDef(final JCVariableDecl tree) {
5643 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5644 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5645 validateAnnotatedType(tree.vartype, tree.sym.type);
5646 scan(tree.mods);
5647 scan(tree.vartype);
5648 if (!sigOnly) {
5649 scan(tree.init);
5650 }
5651 }
5652 public void visitTypeCast(JCTypeCast tree) {
5653 if (tree.clazz != null && tree.clazz.type != null)
5654 validateAnnotatedType(tree.clazz, tree.clazz.type);
5655 super.visitTypeCast(tree);
5656 }
5657 public void visitTypeTest(JCInstanceOf tree) {
5658 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5659 validateAnnotatedType(tree.pattern, tree.pattern.type);
5660 super.visitTypeTest(tree);
5661 }
5662 public void visitNewClass(JCNewClass tree) {
5663 if (tree.clazz != null && tree.clazz.type != null) {
5664 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5665 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5666 tree.clazz.type.tsym);
5667 }
5668 if (tree.def != null) {
5669 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5670 }
5671
5672 validateAnnotatedType(tree.clazz, tree.clazz.type);
5673 }
5674 super.visitNewClass(tree);
5675 }
5676 public void visitNewArray(JCNewArray tree) {
5677 if (tree.elemtype != null && tree.elemtype.type != null) {
5678 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5679 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5680 tree.elemtype.type.tsym);
5681 }
5682 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5683 }
5684 super.visitNewArray(tree);
5685 }
5686 public void visitClassDef(JCClassDecl tree) {
5687 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5688 if (sigOnly) {
5689 scan(tree.mods);
5690 scan(tree.typarams);
5691 scan(tree.extending);
5692 scan(tree.implementing);
5693 }
5694 for (JCTree member : tree.defs) {
5695 if (member.hasTag(Tag.CLASSDEF)) {
5696 continue;
5697 }
5698 scan(member);
5699 }
5700 }
5701 public void visitBlock(JCBlock tree) {
5702 if (!sigOnly) {
5703 scan(tree.stats);
5704 }
5705 }
5706
5707 /* I would want to model this after
5708 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5709 * and override visitSelect and visitTypeApply.
5710 * However, we only set the annotated type in the top-level type
5711 * of the symbol.
5712 * Therefore, we need to override each individual location where a type
5713 * can occur.
5714 */
5715 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5716 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5717
5718 if (type.isPrimitiveOrVoid()) {
5719 return;
5720 }
5721
5722 JCTree enclTr = errtree;
5723 Type enclTy = type;
5724
5725 boolean repeat = true;
5726 while (repeat) {
5727 if (enclTr.hasTag(TYPEAPPLY)) {
5728 List<Type> tyargs = enclTy.getTypeArguments();
5729 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5730 if (trargs.length() > 0) {
5731 // Nothing to do for diamonds
5732 if (tyargs.length() == trargs.length()) {
5733 for (int i = 0; i < tyargs.length(); ++i) {
5734 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5735 }
5736 }
5737 // If the lengths don't match, it's either a diamond
5738 // or some nested type that redundantly provides
5739 // type arguments in the tree.
5740 }
5741
5742 // Look at the clazz part of a generic type
5743 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5744 }
5745
5746 if (enclTr.hasTag(SELECT)) {
5747 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5748 if (enclTy != null &&
5749 !enclTy.hasTag(NONE)) {
5750 enclTy = enclTy.getEnclosingType();
5751 }
5752 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5753 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5754 if (enclTy == null || enclTy.hasTag(NONE)) {
5755 if (at.getAnnotations().size() == 1) {
5756 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5757 } else {
5758 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5759 for (JCAnnotation an : at.getAnnotations()) {
5760 comps.add(an.attribute);
5761 }
5762 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5763 }
5764 repeat = false;
5765 }
5766 enclTr = at.underlyingType;
5767 // enclTy doesn't need to be changed
5768 } else if (enclTr.hasTag(IDENT)) {
5769 repeat = false;
5770 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5771 JCWildcard wc = (JCWildcard) enclTr;
5772 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5773 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5774 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5775 } else {
5776 // Nothing to do for UNBOUND
5777 }
5778 repeat = false;
5779 } else if (enclTr.hasTag(TYPEARRAY)) {
5780 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5781 validateAnnotatedType(art.getType(), art.elemtype.type);
5782 repeat = false;
5783 } else if (enclTr.hasTag(TYPEUNION)) {
5784 JCTypeUnion ut = (JCTypeUnion) enclTr;
5785 for (JCTree t : ut.getTypeAlternatives()) {
5786 validateAnnotatedType(t, t.type);
5787 }
5788 repeat = false;
5789 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5790 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5791 for (JCTree t : it.getBounds()) {
5792 validateAnnotatedType(t, t.type);
5793 }
5794 repeat = false;
5795 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5796 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5797 repeat = false;
5798 } else {
5799 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5800 " within: "+ errtree + " with kind: " + errtree.getKind());
5801 }
5802 }
5803 }
5804
5805 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5806 Symbol sym) {
5807 // Ensure that no declaration annotations are present.
5808 // Note that a tree type might be an AnnotatedType with
5809 // empty annotations, if only declaration annotations were given.
5810 // This method will raise an error for such a type.
5811 for (JCAnnotation ai : annotations) {
5812 if (!ai.type.isErroneous() &&
5813 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5814 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5815 }
5816 }
5817 }
5818 }
5819
5820 // <editor-fold desc="post-attribution visitor">
5821
5822 /**
5823 * Handle missing types/symbols in an AST. This routine is useful when
5824 * the compiler has encountered some errors (which might have ended up
5825 * terminating attribution abruptly); if the compiler is used in fail-over
5826 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5827 * prevents NPE to be propagated during subsequent compilation steps.
5828 */
5829 public void postAttr(JCTree tree) {
5830 new PostAttrAnalyzer().scan(tree);
5831 }
5832
5833 class PostAttrAnalyzer extends TreeScanner {
5834
5835 private void initTypeIfNeeded(JCTree that) {
5836 if (that.type == null) {
5837 if (that.hasTag(METHODDEF)) {
5838 that.type = dummyMethodType((JCMethodDecl)that);
5839 } else {
5840 that.type = syms.unknownType;
5841 }
5842 }
5843 }
5844
5845 /* Construct a dummy method type. If we have a method declaration,
5846 * and the declared return type is void, then use that return type
5847 * instead of UNKNOWN to avoid spurious error messages in lambda
5848 * bodies (see:JDK-8041704).
5849 */
5850 private Type dummyMethodType(JCMethodDecl md) {
5851 Type restype = syms.unknownType;
5852 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5853 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5854 if (prim.typetag == VOID)
5855 restype = syms.voidType;
5856 }
5857 return new MethodType(List.nil(), restype,
5858 List.nil(), syms.methodClass);
5859 }
5860 private Type dummyMethodType() {
5861 return dummyMethodType(null);
5862 }
5863
5864 @Override
5865 public void scan(JCTree tree) {
5866 if (tree == null) return;
5867 if (tree instanceof JCExpression) {
5868 initTypeIfNeeded(tree);
5869 }
5870 super.scan(tree);
5871 }
5872
5873 @Override
5874 public void visitIdent(JCIdent that) {
5875 if (that.sym == null) {
5876 that.sym = syms.unknownSymbol;
5877 }
5878 }
5879
5880 @Override
5881 public void visitSelect(JCFieldAccess that) {
5882 if (that.sym == null) {
5883 that.sym = syms.unknownSymbol;
5884 }
5885 super.visitSelect(that);
5886 }
5887
5888 @Override
5889 public void visitClassDef(JCClassDecl that) {
5890 initTypeIfNeeded(that);
5891 if (that.sym == null) {
5892 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
5893 }
5894 super.visitClassDef(that);
5895 }
5896
5897 @Override
5898 public void visitMethodDef(JCMethodDecl that) {
5899 initTypeIfNeeded(that);
5900 if (that.sym == null) {
5901 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
5902 }
5903 super.visitMethodDef(that);
5904 }
5905
5906 @Override
5907 public void visitVarDef(JCVariableDecl that) {
5908 initTypeIfNeeded(that);
5909 if (that.sym == null) {
5910 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
5911 that.sym.adr = 0;
5912 }
5913 if (that.vartype == null) {
5914 that.vartype = make.at(Position.NOPOS).Erroneous();
5915 }
5916 super.visitVarDef(that);
5917 }
5918
5919 @Override
5920 public void visitBindingPattern(JCBindingPattern that) {
5921 if (that.var.sym == null) {
5922 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
5923 that.var.sym.adr = 0;
5924 }
5925 super.visitBindingPattern(that);
5926 }
5927
5928 @Override
5929 public void visitNewClass(JCNewClass that) {
5930 if (that.constructor == null) {
5931 that.constructor = new MethodSymbol(0, names.init,
5932 dummyMethodType(), syms.noSymbol);
5933 }
5934 if (that.constructorType == null) {
5935 that.constructorType = syms.unknownType;
5936 }
5937 super.visitNewClass(that);
5938 }
5939
5940 @Override
5941 public void visitAssignop(JCAssignOp that) {
5942 if (that.operator == null) {
5943 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5944 -1, syms.noSymbol);
5945 }
5946 super.visitAssignop(that);
5947 }
5948
5949 @Override
5950 public void visitBinary(JCBinary that) {
5951 if (that.operator == null) {
5952 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5953 -1, syms.noSymbol);
5954 }
5955 super.visitBinary(that);
5956 }
5957
5958 @Override
5959 public void visitUnary(JCUnary that) {
5960 if (that.operator == null) {
5961 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5962 -1, syms.noSymbol);
5963 }
5964 super.visitUnary(that);
5965 }
5966
5967 @Override
5968 public void visitReference(JCMemberReference that) {
5969 super.visitReference(that);
5970 if (that.sym == null) {
5971 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
5972 syms.noSymbol);
5973 }
5974 }
5975 }
5976 // </editor-fold>
5977
5978 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
5979 new TreeScanner() {
5980 Symbol packge = pkg;
5981 @Override
5982 public void visitIdent(JCIdent that) {
5983 that.sym = packge;
5984 }
5985
5986 @Override
5987 public void visitSelect(JCFieldAccess that) {
5988 that.sym = packge;
5989 packge = packge.owner;
5990 super.visitSelect(that);
5991 }
5992 }.scan(pid);
5993 }
5994
5995 }