1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
62 import com.sun.tools.javac.tree.*;
63 import com.sun.tools.javac.tree.JCTree.*;
64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
65 import com.sun.tools.javac.util.*;
66 import com.sun.tools.javac.util.DefinedBy.Api;
67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
68 import com.sun.tools.javac.util.JCDiagnostic.Error;
69 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
70 import com.sun.tools.javac.util.JCDiagnostic.Warning;
71 import com.sun.tools.javac.util.List;
72
73 import static com.sun.tools.javac.code.Flags.*;
74 import static com.sun.tools.javac.code.Flags.ANNOTATION;
75 import static com.sun.tools.javac.code.Flags.BLOCK;
76 import static com.sun.tools.javac.code.Kinds.*;
77 import static com.sun.tools.javac.code.Kinds.Kind.*;
78 import static com.sun.tools.javac.code.TypeTag.*;
79 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
80 import static com.sun.tools.javac.tree.JCTree.Tag.*;
81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
82
83 /** This is the main context-dependent analysis phase in GJC. It
84 * encompasses name resolution, type checking and constant folding as
85 * subtasks. Some subtasks involve auxiliary classes.
86 * @see Check
87 * @see Resolve
88 * @see ConstFold
89 * @see Infer
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public class Attr extends JCTree.Visitor {
97 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
98
99 final Names names;
100 final Log log;
101 final Symtab syms;
102 final Resolve rs;
103 final Operators operators;
104 final Infer infer;
105 final Analyzer analyzer;
106 final DeferredAttr deferredAttr;
107 final Check chk;
108 final Flow flow;
109 final MemberEnter memberEnter;
110 final TypeEnter typeEnter;
111 final TreeMaker make;
112 final ConstFold cfolder;
113 final Enter enter;
114 final Target target;
115 final Types types;
116 final Preview preview;
117 final JCDiagnostic.Factory diags;
118 final TypeAnnotations typeAnnotations;
119 final DeferredLintHandler deferredLintHandler;
120 final TypeEnvs typeEnvs;
121 final Dependencies dependencies;
122 final Annotate annotate;
123 final ArgumentAttr argumentAttr;
124 final MatchBindingsComputer matchBindingsComputer;
125 final AttrRecover attrRecover;
126
127 public static Attr instance(Context context) {
128 Attr instance = context.get(attrKey);
129 if (instance == null)
130 instance = new Attr(context);
131 return instance;
132 }
133
134 @SuppressWarnings("this-escape")
135 protected Attr(Context context) {
136 context.put(attrKey, this);
137
138 names = Names.instance(context);
139 log = Log.instance(context);
140 syms = Symtab.instance(context);
141 rs = Resolve.instance(context);
142 operators = Operators.instance(context);
143 chk = Check.instance(context);
144 flow = Flow.instance(context);
145 memberEnter = MemberEnter.instance(context);
146 typeEnter = TypeEnter.instance(context);
147 make = TreeMaker.instance(context);
148 enter = Enter.instance(context);
149 infer = Infer.instance(context);
150 analyzer = Analyzer.instance(context);
151 deferredAttr = DeferredAttr.instance(context);
152 cfolder = ConstFold.instance(context);
153 target = Target.instance(context);
154 types = Types.instance(context);
155 preview = Preview.instance(context);
156 diags = JCDiagnostic.Factory.instance(context);
157 annotate = Annotate.instance(context);
158 typeAnnotations = TypeAnnotations.instance(context);
159 deferredLintHandler = DeferredLintHandler.instance(context);
160 typeEnvs = TypeEnvs.instance(context);
161 dependencies = Dependencies.instance(context);
162 argumentAttr = ArgumentAttr.instance(context);
163 matchBindingsComputer = MatchBindingsComputer.instance(context);
164 attrRecover = AttrRecover.instance(context);
165
166 Options options = Options.instance(context);
167
168 Source source = Source.instance(context);
169 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
170 allowRecords = Feature.RECORDS.allowedInSource(source);
171 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
172 Feature.PATTERN_SWITCH.allowedInSource(source);
173 allowUnconditionalPatternsInstanceOf =
174 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
175 sourceName = source.name;
176 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
177
178 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
179 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
180 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
181 methodAttrInfo = new MethodAttrInfo();
182 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
183 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
184 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
185 }
186
187 /** Switch: reifiable types in instanceof enabled?
188 */
189 boolean allowReifiableTypesInInstanceof;
190
191 /** Are records allowed
192 */
193 private final boolean allowRecords;
194
195 /** Are patterns in switch allowed
196 */
197 private final boolean allowPatternSwitch;
198
199 /** Are unconditional patterns in instanceof allowed
200 */
201 private final boolean allowUnconditionalPatternsInstanceOf;
202
203 /**
204 * Switch: warn about use of variable before declaration?
205 * RFE: 6425594
206 */
207 boolean useBeforeDeclarationWarning;
208
209 /**
210 * Switch: name of source level; used for error reporting.
211 */
212 String sourceName;
213
214 /** Check kind and type of given tree against protokind and prototype.
215 * If check succeeds, store type in tree and return it.
216 * If check fails, store errType in tree and return it.
217 * No checks are performed if the prototype is a method type.
218 * It is not necessary in this case since we know that kind and type
219 * are correct.
220 *
221 * @param tree The tree whose kind and type is checked
222 * @param found The computed type of the tree
223 * @param ownkind The computed kind of the tree
224 * @param resultInfo The expected result of the tree
225 */
226 Type check(final JCTree tree,
227 final Type found,
228 final KindSelector ownkind,
229 final ResultInfo resultInfo) {
230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
231 Type owntype;
232 boolean shouldCheck = !found.hasTag(ERROR) &&
233 !resultInfo.pt.hasTag(METHOD) &&
234 !resultInfo.pt.hasTag(FORALL);
235 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
236 log.error(tree.pos(),
237 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
238 ownkind.kindNames()));
239 owntype = types.createErrorType(found);
240 } else if (inferenceContext.free(found)) {
241 //delay the check if there are inference variables in the found type
242 //this means we are dealing with a partially inferred poly expression
243 owntype = shouldCheck ? resultInfo.pt : found;
244 if (resultInfo.checkMode.installPostInferenceHook()) {
245 inferenceContext.addFreeTypeListener(List.of(found),
246 instantiatedContext -> {
247 ResultInfo pendingResult =
248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
250 });
251 }
252 } else {
253 owntype = shouldCheck ?
254 resultInfo.check(tree, found) :
255 found;
256 }
257 if (resultInfo.checkMode.updateTreeType()) {
258 tree.type = owntype;
259 }
260 return owntype;
261 }
262
263 /** Is given blank final variable assignable, i.e. in a scope where it
264 * may be assigned to even though it is final?
265 * @param v The blank final variable.
266 * @param env The current environment.
267 */
268 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
269 Symbol owner = env.info.scope.owner;
270 // owner refers to the innermost variable, method or
271 // initializer block declaration at this point.
272 boolean isAssignable =
273 v.owner == owner
274 ||
275 ((owner.name == names.init || // i.e. we are in a constructor
276 owner.kind == VAR || // i.e. we are in a variable initializer
277 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
278 &&
279 v.owner == owner.owner
280 &&
281 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
282 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
283 return isAssignable & !insideCompactConstructor;
284 }
285
286 /** Check that variable can be assigned to.
287 * @param pos The current source code position.
288 * @param v The assigned variable
289 * @param base If the variable is referred to in a Select, the part
290 * to the left of the `.', null otherwise.
291 * @param env The current environment.
292 */
293 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
294 if (v.name == names._this) {
295 log.error(pos, Errors.CantAssignValToThis);
296 } else if ((v.flags() & FINAL) != 0 &&
297 ((v.flags() & HASINIT) != 0
298 ||
299 !((base == null ||
300 TreeInfo.isThisQualifier(base)) &&
301 isAssignableAsBlankFinal(v, env)))) {
302 if (v.isResourceVariable()) { //TWR resource
303 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
304 } else {
305 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
306 }
307 }
308 }
309
310 /** Does tree represent a static reference to an identifier?
311 * It is assumed that tree is either a SELECT or an IDENT.
312 * We have to weed out selects from non-type names here.
313 * @param tree The candidate tree.
314 */
315 boolean isStaticReference(JCTree tree) {
316 if (tree.hasTag(SELECT)) {
317 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
318 if (lsym == null || lsym.kind != TYP) {
319 return false;
320 }
321 }
322 return true;
323 }
324
325 /** Is this symbol a type?
326 */
327 static boolean isType(Symbol sym) {
328 return sym != null && sym.kind == TYP;
329 }
330
331 /** The current `this' symbol.
332 * @param env The current environment.
333 */
334 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
335 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
336 }
337
338 /** Attribute a parsed identifier.
339 * @param tree Parsed identifier name
340 * @param topLevel The toplevel to use
341 */
342 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
343 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
344 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
345 syms.errSymbol.name,
346 null, null, null, null);
347 localEnv.enclClass.sym = syms.errSymbol;
348 return attribIdent(tree, localEnv);
349 }
350
351 /** Attribute a parsed identifier.
352 * @param tree Parsed identifier name
353 * @param env The env to use
354 */
355 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
356 return tree.accept(identAttributer, env);
357 }
358 // where
359 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
360 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
361 @Override @DefinedBy(Api.COMPILER_TREE)
362 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
363 Symbol site = visit(node.getExpression(), env);
364 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
365 return site;
366 Name name = (Name)node.getIdentifier();
367 if (site.kind == PCK) {
368 env.toplevel.packge = (PackageSymbol)site;
369 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
370 KindSelector.TYP_PCK);
371 } else {
372 env.enclClass.sym = (ClassSymbol)site;
373 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
374 }
375 }
376
377 @Override @DefinedBy(Api.COMPILER_TREE)
378 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
379 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
380 }
381 }
382
383 public Type coerce(Type etype, Type ttype) {
384 return cfolder.coerce(etype, ttype);
385 }
386
387 public Type attribType(JCTree node, TypeSymbol sym) {
388 Env<AttrContext> env = typeEnvs.get(sym);
389 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
390 return attribTree(node, localEnv, unknownTypeInfo);
391 }
392
393 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
394 // Attribute qualifying package or class.
395 JCFieldAccess s = tree.qualid;
396 return attribTree(s.selected, env,
397 new ResultInfo(tree.staticImport ?
398 KindSelector.TYP : KindSelector.TYP_PCK,
399 Type.noType));
400 }
401
402 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
403 return attribToTree(expr, env, tree, unknownExprInfo);
404 }
405
406 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
407 return attribToTree(stmt, env, tree, statInfo);
408 }
409
410 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
411 breakTree = tree;
412 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
413 try {
414 deferredAttr.attribSpeculative(root, env, resultInfo,
415 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
416 argumentAttr.withLocalCacheContext());
417 attrRecover.doRecovery();
418 } catch (BreakAttr b) {
419 return b.env;
420 } catch (AssertionError ae) {
421 if (ae.getCause() instanceof BreakAttr breakAttr) {
422 return breakAttr.env;
423 } else {
424 throw ae;
425 }
426 } finally {
427 breakTree = null;
428 log.useSource(prev);
429 }
430 return env;
431 }
432
433 private JCTree breakTree = null;
434
435 private static class BreakAttr extends RuntimeException {
436 static final long serialVersionUID = -6924771130405446405L;
437 private transient Env<AttrContext> env;
438 private BreakAttr(Env<AttrContext> env) {
439 this.env = env;
440 }
441 }
442
443 /**
444 * Mode controlling behavior of Attr.Check
445 */
446 enum CheckMode {
447
448 NORMAL,
449
450 /**
451 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
452 * that the captured var cache in {@code InferenceContext} will be used in read-only
453 * mode when performing inference checks.
454 */
455 NO_TREE_UPDATE {
456 @Override
457 public boolean updateTreeType() {
458 return false;
459 }
460 },
461 /**
462 * Mode signalling that caller will manage free types in tree decorations.
463 */
464 NO_INFERENCE_HOOK {
465 @Override
466 public boolean installPostInferenceHook() {
467 return false;
468 }
469 };
470
471 public boolean updateTreeType() {
472 return true;
473 }
474 public boolean installPostInferenceHook() {
475 return true;
476 }
477 }
478
479
480 class ResultInfo {
481 final KindSelector pkind;
482 final Type pt;
483 final CheckContext checkContext;
484 final CheckMode checkMode;
485
486 ResultInfo(KindSelector pkind, Type pt) {
487 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
488 }
489
490 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
491 this(pkind, pt, chk.basicHandler, checkMode);
492 }
493
494 protected ResultInfo(KindSelector pkind,
495 Type pt, CheckContext checkContext) {
496 this(pkind, pt, checkContext, CheckMode.NORMAL);
497 }
498
499 protected ResultInfo(KindSelector pkind,
500 Type pt, CheckContext checkContext, CheckMode checkMode) {
501 this.pkind = pkind;
502 this.pt = pt;
503 this.checkContext = checkContext;
504 this.checkMode = checkMode;
505 }
506
507 /**
508 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
509 * @param tree The tree to be type-checked.
510 * @return true if {@code ArgumentAttr} should be used.
511 */
512 protected boolean needsArgumentAttr(JCTree tree) { return false; }
513
514 protected Type check(final DiagnosticPosition pos, final Type found) {
515 return chk.checkType(pos, found, pt, checkContext);
516 }
517
518 protected ResultInfo dup(Type newPt) {
519 return new ResultInfo(pkind, newPt, checkContext, checkMode);
520 }
521
522 protected ResultInfo dup(CheckContext newContext) {
523 return new ResultInfo(pkind, pt, newContext, checkMode);
524 }
525
526 protected ResultInfo dup(Type newPt, CheckContext newContext) {
527 return new ResultInfo(pkind, newPt, newContext, checkMode);
528 }
529
530 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
531 return new ResultInfo(pkind, newPt, newContext, newMode);
532 }
533
534 protected ResultInfo dup(CheckMode newMode) {
535 return new ResultInfo(pkind, pt, checkContext, newMode);
536 }
537
538 @Override
539 public String toString() {
540 if (pt != null) {
541 return pt.toString();
542 } else {
543 return "";
544 }
545 }
546 }
547
548 class MethodAttrInfo extends ResultInfo {
549 public MethodAttrInfo() {
550 this(chk.basicHandler);
551 }
552
553 public MethodAttrInfo(CheckContext checkContext) {
554 super(KindSelector.VAL, Infer.anyPoly, checkContext);
555 }
556
557 @Override
558 protected boolean needsArgumentAttr(JCTree tree) {
559 return true;
560 }
561
562 protected ResultInfo dup(Type newPt) {
563 throw new IllegalStateException();
564 }
565
566 protected ResultInfo dup(CheckContext newContext) {
567 return new MethodAttrInfo(newContext);
568 }
569
570 protected ResultInfo dup(Type newPt, CheckContext newContext) {
571 throw new IllegalStateException();
572 }
573
574 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
575 throw new IllegalStateException();
576 }
577
578 protected ResultInfo dup(CheckMode newMode) {
579 throw new IllegalStateException();
580 }
581 }
582
583 class RecoveryInfo extends ResultInfo {
584
585 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
586 this(deferredAttrContext, Type.recoveryType);
587 }
588
589 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
590 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
591 @Override
592 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
593 return deferredAttrContext;
594 }
595 @Override
596 public boolean compatible(Type found, Type req, Warner warn) {
597 return true;
598 }
599 @Override
600 public void report(DiagnosticPosition pos, JCDiagnostic details) {
601 boolean needsReport = pt == Type.recoveryType ||
602 (details.getDiagnosticPosition() != null &&
603 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
604 if (needsReport) {
605 chk.basicHandler.report(pos, details);
606 }
607 }
608 });
609 }
610 }
611
612 final ResultInfo statInfo;
613 final ResultInfo varAssignmentInfo;
614 final ResultInfo methodAttrInfo;
615 final ResultInfo unknownExprInfo;
616 final ResultInfo unknownTypeInfo;
617 final ResultInfo unknownTypeExprInfo;
618 final ResultInfo recoveryInfo;
619
620 Type pt() {
621 return resultInfo.pt;
622 }
623
624 KindSelector pkind() {
625 return resultInfo.pkind;
626 }
627
628 /* ************************************************************************
629 * Visitor methods
630 *************************************************************************/
631
632 /** Visitor argument: the current environment.
633 */
634 Env<AttrContext> env;
635
636 /** Visitor argument: the currently expected attribution result.
637 */
638 ResultInfo resultInfo;
639
640 /** Visitor result: the computed type.
641 */
642 Type result;
643
644 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
645
646 /** Visitor method: attribute a tree, catching any completion failure
647 * exceptions. Return the tree's type.
648 *
649 * @param tree The tree to be visited.
650 * @param env The environment visitor argument.
651 * @param resultInfo The result info visitor argument.
652 */
653 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
654 Env<AttrContext> prevEnv = this.env;
655 ResultInfo prevResult = this.resultInfo;
656 try {
657 this.env = env;
658 this.resultInfo = resultInfo;
659 if (resultInfo.needsArgumentAttr(tree)) {
660 result = argumentAttr.attribArg(tree, env);
661 } else {
662 tree.accept(this);
663 }
664 matchBindings = matchBindingsComputer.finishBindings(tree,
665 matchBindings);
666 if (tree == breakTree &&
667 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
668 breakTreeFound(copyEnv(env));
669 }
670 return result;
671 } catch (CompletionFailure ex) {
672 tree.type = syms.errType;
673 return chk.completionError(tree.pos(), ex);
674 } finally {
675 this.env = prevEnv;
676 this.resultInfo = prevResult;
677 }
678 }
679
680 protected void breakTreeFound(Env<AttrContext> env) {
681 throw new BreakAttr(env);
682 }
683
684 Env<AttrContext> copyEnv(Env<AttrContext> env) {
685 Env<AttrContext> newEnv =
686 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
687 if (newEnv.outer != null) {
688 newEnv.outer = copyEnv(newEnv.outer);
689 }
690 return newEnv;
691 }
692
693 WriteableScope copyScope(WriteableScope sc) {
694 WriteableScope newScope = WriteableScope.create(sc.owner);
695 List<Symbol> elemsList = List.nil();
696 for (Symbol sym : sc.getSymbols()) {
697 elemsList = elemsList.prepend(sym);
698 }
699 for (Symbol s : elemsList) {
700 newScope.enter(s);
701 }
702 return newScope;
703 }
704
705 /** Derived visitor method: attribute an expression tree.
706 */
707 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
708 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
709 }
710
711 /** Derived visitor method: attribute an expression tree with
712 * no constraints on the computed type.
713 */
714 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
715 return attribTree(tree, env, unknownExprInfo);
716 }
717
718 /** Derived visitor method: attribute a type tree.
719 */
720 public Type attribType(JCTree tree, Env<AttrContext> env) {
721 Type result = attribType(tree, env, Type.noType);
722 return result;
723 }
724
725 /** Derived visitor method: attribute a type tree.
726 */
727 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
728 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
729 return result;
730 }
731
732 /** Derived visitor method: attribute a statement or definition tree.
733 */
734 public Type attribStat(JCTree tree, Env<AttrContext> env) {
735 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
736 Type result = attribTree(tree, env, statInfo);
737 analyzer.analyzeIfNeeded(tree, analyzeEnv);
738 attrRecover.doRecovery();
739 return result;
740 }
741
742 /** Attribute a list of expressions, returning a list of types.
743 */
744 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
745 ListBuffer<Type> ts = new ListBuffer<>();
746 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
747 ts.append(attribExpr(l.head, env, pt));
748 return ts.toList();
749 }
750
751 /** Attribute a list of statements, returning nothing.
752 */
753 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
754 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
755 attribStat(l.head, env);
756 }
757
758 /** Attribute the arguments in a method call, returning the method kind.
759 */
760 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
761 KindSelector kind = initialKind;
762 for (JCExpression arg : trees) {
763 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
764 if (argtype.hasTag(DEFERRED)) {
765 kind = KindSelector.of(KindSelector.POLY, kind);
766 }
767 argtypes.append(argtype);
768 }
769 return kind;
770 }
771
772 /** Attribute a type argument list, returning a list of types.
773 * Caller is responsible for calling checkRefTypes.
774 */
775 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
776 ListBuffer<Type> argtypes = new ListBuffer<>();
777 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
778 argtypes.append(attribType(l.head, env));
779 return argtypes.toList();
780 }
781
782 /** Attribute a type argument list, returning a list of types.
783 * Check that all the types are references.
784 */
785 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
786 List<Type> types = attribAnyTypes(trees, env);
787 return chk.checkRefTypes(trees, types);
788 }
789
790 /**
791 * Attribute type variables (of generic classes or methods).
792 * Compound types are attributed later in attribBounds.
793 * @param typarams the type variables to enter
794 * @param env the current environment
795 */
796 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
797 for (JCTypeParameter tvar : typarams) {
798 TypeVar a = (TypeVar)tvar.type;
799 a.tsym.flags_field |= UNATTRIBUTED;
800 a.setUpperBound(Type.noType);
801 if (!tvar.bounds.isEmpty()) {
802 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
803 for (JCExpression bound : tvar.bounds.tail)
804 bounds = bounds.prepend(attribType(bound, env));
805 types.setBounds(a, bounds.reverse());
806 } else {
807 // if no bounds are given, assume a single bound of
808 // java.lang.Object.
809 types.setBounds(a, List.of(syms.objectType));
810 }
811 a.tsym.flags_field &= ~UNATTRIBUTED;
812 }
813 if (checkCyclic) {
814 for (JCTypeParameter tvar : typarams) {
815 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
816 }
817 }
818 }
819
820 /**
821 * Attribute the type references in a list of annotations.
822 */
823 void attribAnnotationTypes(List<JCAnnotation> annotations,
824 Env<AttrContext> env) {
825 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
826 JCAnnotation a = al.head;
827 attribType(a.annotationType, env);
828 }
829 }
830
831 /**
832 * Attribute a "lazy constant value".
833 * @param env The env for the const value
834 * @param variable The initializer for the const value
835 * @param type The expected type, or null
836 * @see VarSymbol#setLazyConstValue
837 */
838 public Object attribLazyConstantValue(Env<AttrContext> env,
839 JCVariableDecl variable,
840 Type type) {
841
842 DiagnosticPosition prevLintPos
843 = deferredLintHandler.setPos(variable.pos());
844
845 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
846 try {
847 Type itype = attribExpr(variable.init, env, type);
848 if (variable.isImplicitlyTyped()) {
849 //fixup local variable type
850 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
851 }
852 if (itype.constValue() != null) {
853 return coerce(itype, type).constValue();
854 } else {
855 return null;
856 }
857 } finally {
858 log.useSource(prevSource);
859 deferredLintHandler.setPos(prevLintPos);
860 }
861 }
862
863 /** Attribute type reference in an `extends' or `implements' clause.
864 * Supertypes of anonymous inner classes are usually already attributed.
865 *
866 * @param tree The tree making up the type reference.
867 * @param env The environment current at the reference.
868 * @param classExpected true if only a class is expected here.
869 * @param interfaceExpected true if only an interface is expected here.
870 */
871 Type attribBase(JCTree tree,
872 Env<AttrContext> env,
873 boolean classExpected,
874 boolean interfaceExpected,
875 boolean checkExtensible) {
876 Type t = tree.type != null ?
877 tree.type :
878 attribType(tree, env);
879 try {
880 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
881 } catch (CompletionFailure ex) {
882 chk.completionError(tree.pos(), ex);
883 return t;
884 }
885 }
886 Type checkBase(Type t,
887 JCTree tree,
888 Env<AttrContext> env,
889 boolean classExpected,
890 boolean interfaceExpected,
891 boolean checkExtensible) {
892 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
893 (((JCTypeApply) tree).clazz).pos() : tree.pos();
894 if (t.tsym.isAnonymous()) {
895 log.error(pos, Errors.CantInheritFromAnon);
896 return types.createErrorType(t);
897 }
898 if (t.isErroneous())
899 return t;
900 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
901 // check that type variable is already visible
902 if (t.getUpperBound() == null) {
903 log.error(pos, Errors.IllegalForwardRef);
904 return types.createErrorType(t);
905 }
906 } else {
907 t = chk.checkClassType(pos, t, checkExtensible);
908 }
909 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
910 log.error(pos, Errors.IntfExpectedHere);
911 // return errType is necessary since otherwise there might
912 // be undetected cycles which cause attribution to loop
913 return types.createErrorType(t);
914 } else if (checkExtensible &&
915 classExpected &&
916 (t.tsym.flags() & INTERFACE) != 0) {
917 log.error(pos, Errors.NoIntfExpectedHere);
918 return types.createErrorType(t);
919 }
920 if (checkExtensible &&
921 ((t.tsym.flags() & FINAL) != 0)) {
922 log.error(pos,
923 Errors.CantInheritFromFinal(t.tsym));
924 }
925 chk.checkNonCyclic(pos, t);
926 return t;
927 }
928
929 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
930 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
931 id.type = env.info.scope.owner.enclClass().type;
932 id.sym = env.info.scope.owner.enclClass();
933 return id.type;
934 }
935
936 public void visitClassDef(JCClassDecl tree) {
937 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
938 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
939 argumentAttr.withLocalCacheContext() : null);
940 try {
941 // Local and anonymous classes have not been entered yet, so we need to
942 // do it now.
943 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
944 enter.classEnter(tree, env);
945 } else {
946 // If this class declaration is part of a class level annotation,
947 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
948 // order to simplify later steps and allow for sensible error
949 // messages.
950 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
951 enter.classEnter(tree, env);
952 }
953
954 ClassSymbol c = tree.sym;
955 if (c == null) {
956 // exit in case something drastic went wrong during enter.
957 result = null;
958 } else {
959 // make sure class has been completed:
960 c.complete();
961
962 // If this class appears as an anonymous class
963 // in a superclass constructor call
964 // disable implicit outer instance from being passed.
965 // (This would be an illegal access to "this before super").
966 if (env.info.isSelfCall &&
967 env.tree.hasTag(NEWCLASS)) {
968 c.flags_field |= NOOUTERTHIS;
969 }
970 attribClass(tree.pos(), c);
971 result = tree.type = c.type;
972 }
973 } finally {
974 localCacheContext.ifPresent(LocalCacheContext::leave);
975 }
976 }
977
978 public void visitMethodDef(JCMethodDecl tree) {
979 MethodSymbol m = tree.sym;
980 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
981
982 Lint lint = env.info.lint.augment(m);
983 Lint prevLint = chk.setLint(lint);
984 MethodSymbol prevMethod = chk.setMethod(m);
985 try {
986 deferredLintHandler.flush(tree.pos());
987 chk.checkDeprecatedAnnotation(tree.pos(), m);
988
989
990 // Create a new environment with local scope
991 // for attributing the method.
992 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
993 localEnv.info.lint = lint;
994
995 attribStats(tree.typarams, localEnv);
996
997 // If we override any other methods, check that we do so properly.
998 // JLS ???
999 if (m.isStatic()) {
1000 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1001 } else {
1002 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1003 }
1004 chk.checkOverride(env, tree, m);
1005
1006 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1007 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1008 }
1009
1010 // Enter all type parameters into the local method scope.
1011 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1012 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1013
1014 ClassSymbol owner = env.enclClass.sym;
1015 if ((owner.flags() & ANNOTATION) != 0 &&
1016 (tree.params.nonEmpty() ||
1017 tree.recvparam != null))
1018 log.error(tree.params.nonEmpty() ?
1019 tree.params.head.pos() :
1020 tree.recvparam.pos(),
1021 Errors.IntfAnnotationMembersCantHaveParams);
1022
1023 // Attribute all value parameters.
1024 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1025 attribStat(l.head, localEnv);
1026 }
1027
1028 chk.checkVarargsMethodDecl(localEnv, tree);
1029
1030 // Check that type parameters are well-formed.
1031 chk.validate(tree.typarams, localEnv);
1032
1033 // Check that result type is well-formed.
1034 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1035 chk.validate(tree.restype, localEnv);
1036
1037 // Check that receiver type is well-formed.
1038 if (tree.recvparam != null) {
1039 // Use a new environment to check the receiver parameter.
1040 // Otherwise I get "might not have been initialized" errors.
1041 // Is there a better way?
1042 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1043 attribType(tree.recvparam, newEnv);
1044 chk.validate(tree.recvparam, newEnv);
1045 }
1046
1047 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1048 // lets find if this method is an accessor
1049 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1050 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1051 if (recordComponent.isPresent()) {
1052 // the method is a user defined accessor lets check that everything is fine
1053 if (!tree.sym.isPublic()) {
1054 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1055 }
1056 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1057 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1058 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1059 }
1060 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1061 log.error(tree,
1062 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1063 }
1064 if (!tree.typarams.isEmpty()) {
1065 log.error(tree,
1066 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1067 }
1068 if (tree.sym.isStatic()) {
1069 log.error(tree,
1070 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1071 }
1072 }
1073
1074 if (tree.name == names.init) {
1075 // if this a constructor other than the canonical one
1076 if ((tree.sym.flags_field & RECORD) == 0) {
1077 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1078 if (app == null ||
1079 TreeInfo.name(app.meth) != names._this ||
1080 !checkFirstConstructorStat(app, tree, false)) {
1081 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1082 }
1083 } else {
1084 // but if it is the canonical:
1085
1086 /* if user generated, then it shouldn't:
1087 * - have an accessibility stricter than that of the record type
1088 * - explicitly invoke any other constructor
1089 */
1090 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1091 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1092 log.error(tree,
1093 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1094 Errors.InvalidCanonicalConstructorInRecord(
1095 Fragments.Canonical,
1096 env.enclClass.sym.name,
1097 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1098 ) :
1099 Errors.InvalidCanonicalConstructorInRecord(
1100 Fragments.Canonical,
1101 env.enclClass.sym.name,
1102 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1103 )
1104 );
1105 }
1106
1107 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1108 if (app != null &&
1109 (TreeInfo.name(app.meth) == names._this ||
1110 TreeInfo.name(app.meth) == names._super) &&
1111 checkFirstConstructorStat(app, tree, false)) {
1112 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1113 Fragments.Canonical, env.enclClass.sym.name,
1114 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1115 }
1116 }
1117
1118 // also we want to check that no type variables have been defined
1119 if (!tree.typarams.isEmpty()) {
1120 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1121 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1122 }
1123
1124 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1125 * record components
1126 */
1127 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1128 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1129 for (JCVariableDecl param: tree.params) {
1130 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1131 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1132 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1133 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1134 Fragments.Canonical, env.enclClass.sym.name,
1135 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1136 }
1137 recordComponents = recordComponents.tail;
1138 recordFieldTypes = recordFieldTypes.tail;
1139 }
1140 }
1141 }
1142 }
1143
1144 // annotation method checks
1145 if ((owner.flags() & ANNOTATION) != 0) {
1146 // annotation method cannot have throws clause
1147 if (tree.thrown.nonEmpty()) {
1148 log.error(tree.thrown.head.pos(),
1149 Errors.ThrowsNotAllowedInIntfAnnotation);
1150 }
1151 // annotation method cannot declare type-parameters
1152 if (tree.typarams.nonEmpty()) {
1153 log.error(tree.typarams.head.pos(),
1154 Errors.IntfAnnotationMembersCantHaveTypeParams);
1155 }
1156 // validate annotation method's return type (could be an annotation type)
1157 chk.validateAnnotationType(tree.restype);
1158 // ensure that annotation method does not clash with members of Object/Annotation
1159 chk.validateAnnotationMethod(tree.pos(), m);
1160 }
1161
1162 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1163 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1164
1165 if (tree.body == null) {
1166 // Empty bodies are only allowed for
1167 // abstract, native, or interface methods, or for methods
1168 // in a retrofit signature class.
1169 if (tree.defaultValue != null) {
1170 if ((owner.flags() & ANNOTATION) == 0)
1171 log.error(tree.pos(),
1172 Errors.DefaultAllowedInIntfAnnotationMember);
1173 }
1174 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1175 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1176 } else {
1177 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1178 if ((owner.flags() & INTERFACE) != 0) {
1179 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1180 } else {
1181 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1182 }
1183 } else if ((tree.mods.flags & NATIVE) != 0) {
1184 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1185 }
1186 // Add an implicit super() call unless an explicit call to
1187 // super(...) or this(...) is given
1188 // or we are compiling class java.lang.Object.
1189 if (tree.name == names.init && owner.type != syms.objectType) {
1190 JCBlock body = tree.body;
1191 if (body.stats.isEmpty() ||
1192 TreeInfo.getConstructorInvocationName(body.stats, names) == names.empty) {
1193 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1194 make.Ident(names._super), make.Idents(List.nil())));
1195 body.stats = body.stats.prepend(supCall);
1196 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1197 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1198 TreeInfo.isSuperCall(body.stats.head)) {
1199 // enum constructors are not allowed to call super
1200 // directly, so make sure there aren't any super calls
1201 // in enum constructors, except in the compiler
1202 // generated one.
1203 log.error(tree.body.stats.head.pos(),
1204 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1205 }
1206 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1207 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1208 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1209 if (!initParamNames.equals(recordComponentNames)) {
1210 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1211 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1212 }
1213 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1214 log.error(tree,
1215 Errors.InvalidCanonicalConstructorInRecord(
1216 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1217 env.enclClass.sym.name,
1218 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1219 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1220 }
1221 }
1222 }
1223
1224 // Attribute all type annotations in the body
1225 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1226 annotate.flush();
1227
1228 // Attribute method body.
1229 attribStat(tree.body, localEnv);
1230 }
1231
1232 localEnv.info.scope.leave();
1233 result = tree.type = m.type;
1234 } finally {
1235 chk.setLint(prevLint);
1236 chk.setMethod(prevMethod);
1237 }
1238 }
1239
1240 public void visitVarDef(JCVariableDecl tree) {
1241 // Local variables have not been entered yet, so we need to do it now:
1242 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1243 if (tree.sym != null) {
1244 // parameters have already been entered
1245 env.info.scope.enter(tree.sym);
1246 } else {
1247 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1248 if (tree.init == null) {
1249 //cannot use 'var' without initializer
1250 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1251 tree.vartype = make.Erroneous();
1252 } else {
1253 Fragment msg = canInferLocalVarType(tree);
1254 if (msg != null) {
1255 //cannot use 'var' with initializer which require an explicit target
1256 //(e.g. lambda, method reference, array initializer).
1257 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1258 tree.vartype = make.Erroneous();
1259 }
1260 }
1261 }
1262 try {
1263 annotate.blockAnnotations();
1264 memberEnter.memberEnter(tree, env);
1265 } finally {
1266 annotate.unblockAnnotations();
1267 }
1268 }
1269 } else {
1270 if (tree.init != null) {
1271 // Field initializer expression need to be entered.
1272 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1273 annotate.flush();
1274 }
1275 }
1276
1277 VarSymbol v = tree.sym;
1278 Lint lint = env.info.lint.augment(v);
1279 Lint prevLint = chk.setLint(lint);
1280
1281 // Check that the variable's declared type is well-formed.
1282 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1283 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1284 (tree.sym.flags() & PARAMETER) != 0;
1285 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1286
1287 try {
1288 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1289 deferredLintHandler.flush(tree.pos());
1290 chk.checkDeprecatedAnnotation(tree.pos(), v);
1291
1292 if (tree.init != null) {
1293 if ((v.flags_field & FINAL) == 0 ||
1294 !memberEnter.needsLazyConstValue(tree.init)) {
1295 // Not a compile-time constant
1296 // Attribute initializer in a new environment
1297 // with the declared variable as owner.
1298 // Check that initializer conforms to variable's declared type.
1299 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1300 initEnv.info.lint = lint;
1301 // In order to catch self-references, we set the variable's
1302 // declaration position to maximal possible value, effectively
1303 // marking the variable as undefined.
1304 initEnv.info.enclVar = v;
1305 attribExpr(tree.init, initEnv, v.type);
1306 if (tree.isImplicitlyTyped()) {
1307 //fixup local variable type
1308 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1309 }
1310 }
1311 if (tree.isImplicitlyTyped()) {
1312 setSyntheticVariableType(tree, v.type);
1313 }
1314 }
1315 result = tree.type = v.type;
1316 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1317 if (isNonArgsMethodInObject(v.name)) {
1318 log.error(tree, Errors.IllegalRecordComponentName(v));
1319 }
1320 }
1321 }
1322 finally {
1323 chk.setLint(prevLint);
1324 }
1325 }
1326
1327 private boolean isNonArgsMethodInObject(Name name) {
1328 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1329 if (s.type.getParameterTypes().isEmpty()) {
1330 return true;
1331 }
1332 }
1333 return false;
1334 }
1335
1336 Fragment canInferLocalVarType(JCVariableDecl tree) {
1337 LocalInitScanner lis = new LocalInitScanner();
1338 lis.scan(tree.init);
1339 return lis.badInferenceMsg;
1340 }
1341
1342 static class LocalInitScanner extends TreeScanner {
1343 Fragment badInferenceMsg = null;
1344 boolean needsTarget = true;
1345
1346 @Override
1347 public void visitNewArray(JCNewArray tree) {
1348 if (tree.elemtype == null && needsTarget) {
1349 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1350 }
1351 }
1352
1353 @Override
1354 public void visitLambda(JCLambda tree) {
1355 if (needsTarget) {
1356 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1357 }
1358 }
1359
1360 @Override
1361 public void visitTypeCast(JCTypeCast tree) {
1362 boolean prevNeedsTarget = needsTarget;
1363 try {
1364 needsTarget = false;
1365 super.visitTypeCast(tree);
1366 } finally {
1367 needsTarget = prevNeedsTarget;
1368 }
1369 }
1370
1371 @Override
1372 public void visitReference(JCMemberReference tree) {
1373 if (needsTarget) {
1374 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1375 }
1376 }
1377
1378 @Override
1379 public void visitNewClass(JCNewClass tree) {
1380 boolean prevNeedsTarget = needsTarget;
1381 try {
1382 needsTarget = false;
1383 super.visitNewClass(tree);
1384 } finally {
1385 needsTarget = prevNeedsTarget;
1386 }
1387 }
1388
1389 @Override
1390 public void visitApply(JCMethodInvocation tree) {
1391 boolean prevNeedsTarget = needsTarget;
1392 try {
1393 needsTarget = false;
1394 super.visitApply(tree);
1395 } finally {
1396 needsTarget = prevNeedsTarget;
1397 }
1398 }
1399 }
1400
1401 public void visitSkip(JCSkip tree) {
1402 result = null;
1403 }
1404
1405 public void visitBlock(JCBlock tree) {
1406 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1407 // Block is a static or instance initializer;
1408 // let the owner of the environment be a freshly
1409 // created BLOCK-method.
1410 Symbol fakeOwner =
1411 new MethodSymbol(tree.flags | BLOCK |
1412 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1413 env.info.scope.owner);
1414 final Env<AttrContext> localEnv =
1415 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1416
1417 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1418 // Attribute all type annotations in the block
1419 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1420 annotate.flush();
1421 attribStats(tree.stats, localEnv);
1422
1423 {
1424 // Store init and clinit type annotations with the ClassSymbol
1425 // to allow output in Gen.normalizeDefs.
1426 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1427 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1428 if ((tree.flags & STATIC) != 0) {
1429 cs.appendClassInitTypeAttributes(tas);
1430 } else {
1431 cs.appendInitTypeAttributes(tas);
1432 }
1433 }
1434 } else {
1435 // Create a new local environment with a local scope.
1436 Env<AttrContext> localEnv =
1437 env.dup(tree, env.info.dup(env.info.scope.dup()));
1438 try {
1439 attribStats(tree.stats, localEnv);
1440 } finally {
1441 localEnv.info.scope.leave();
1442 }
1443 }
1444 result = null;
1445 }
1446
1447 public void visitDoLoop(JCDoWhileLoop tree) {
1448 attribStat(tree.body, env.dup(tree));
1449 attribExpr(tree.cond, env, syms.booleanType);
1450 handleLoopConditionBindings(matchBindings, tree, tree.body);
1451 result = null;
1452 }
1453
1454 public void visitWhileLoop(JCWhileLoop tree) {
1455 attribExpr(tree.cond, env, syms.booleanType);
1456 MatchBindings condBindings = matchBindings;
1457 // include condition's bindings when true in the body:
1458 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1459 try {
1460 attribStat(tree.body, whileEnv.dup(tree));
1461 } finally {
1462 whileEnv.info.scope.leave();
1463 }
1464 handleLoopConditionBindings(condBindings, tree, tree.body);
1465 result = null;
1466 }
1467
1468 public void visitForLoop(JCForLoop tree) {
1469 Env<AttrContext> loopEnv =
1470 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1471 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1472 try {
1473 attribStats(tree.init, loopEnv);
1474 if (tree.cond != null) {
1475 attribExpr(tree.cond, loopEnv, syms.booleanType);
1476 // include condition's bindings when true in the body and step:
1477 condBindings = matchBindings;
1478 }
1479 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1480 try {
1481 bodyEnv.tree = tree; // before, we were not in loop!
1482 attribStats(tree.step, bodyEnv);
1483 attribStat(tree.body, bodyEnv);
1484 } finally {
1485 bodyEnv.info.scope.leave();
1486 }
1487 result = null;
1488 }
1489 finally {
1490 loopEnv.info.scope.leave();
1491 }
1492 handleLoopConditionBindings(condBindings, tree, tree.body);
1493 }
1494
1495 /**
1496 * Include condition's bindings when false after the loop, if cannot get out of the loop
1497 */
1498 private void handleLoopConditionBindings(MatchBindings condBindings,
1499 JCStatement loop,
1500 JCStatement loopBody) {
1501 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1502 !breaksTo(env, loop, loopBody)) {
1503 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1504 }
1505 }
1506
1507 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1508 preFlow(body);
1509 return flow.breaksToTree(env, loop, body, make);
1510 }
1511
1512 /**
1513 * Add given bindings to the current scope, unless there's a break to
1514 * an immediately enclosing labeled statement.
1515 */
1516 private void addBindings2Scope(JCStatement introducingStatement,
1517 List<BindingSymbol> bindings) {
1518 if (bindings.isEmpty()) {
1519 return ;
1520 }
1521
1522 var searchEnv = env;
1523 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1524 labeled.body == introducingStatement) {
1525 if (breaksTo(env, labeled, labeled.body)) {
1526 //breaking to an immediately enclosing labeled statement
1527 return ;
1528 }
1529 searchEnv = searchEnv.next;
1530 introducingStatement = labeled;
1531 }
1532
1533 //include condition's body when false after the while, if cannot get out of the loop
1534 bindings.forEach(env.info.scope::enter);
1535 bindings.forEach(BindingSymbol::preserveBinding);
1536 }
1537
1538 public void visitForeachLoop(JCEnhancedForLoop tree) {
1539 Env<AttrContext> loopEnv =
1540 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1541 try {
1542 //the Formal Parameter of a for-each loop is not in the scope when
1543 //attributing the for-each expression; we mimic this by attributing
1544 //the for-each expression first (against original scope).
1545 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1546 chk.checkNonVoid(tree.pos(), exprType);
1547 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1548 if (elemtype == null) {
1549 // or perhaps expr implements Iterable<T>?
1550 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1551 if (base == null) {
1552 log.error(tree.expr.pos(),
1553 Errors.ForeachNotApplicableToType(exprType,
1554 Fragments.TypeReqArrayOrIterable));
1555 elemtype = types.createErrorType(exprType);
1556 } else {
1557 List<Type> iterableParams = base.allparams();
1558 elemtype = iterableParams.isEmpty()
1559 ? syms.objectType
1560 : types.wildUpperBound(iterableParams.head);
1561
1562 // Check the return type of the method iterator().
1563 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1564 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1565 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1566 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1567 log.error(tree.pos(),
1568 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1569 }
1570 }
1571 }
1572 if (tree.var.isImplicitlyTyped()) {
1573 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1574 setSyntheticVariableType(tree.var, inferredType);
1575 }
1576 attribStat(tree.var, loopEnv);
1577 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1578 loopEnv.tree = tree; // before, we were not in loop!
1579 attribStat(tree.body, loopEnv);
1580 result = null;
1581 }
1582 finally {
1583 loopEnv.info.scope.leave();
1584 }
1585 }
1586
1587 public void visitLabelled(JCLabeledStatement tree) {
1588 // Check that label is not used in an enclosing statement
1589 Env<AttrContext> env1 = env;
1590 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1591 if (env1.tree.hasTag(LABELLED) &&
1592 ((JCLabeledStatement) env1.tree).label == tree.label) {
1593 log.error(tree.pos(),
1594 Errors.LabelAlreadyInUse(tree.label));
1595 break;
1596 }
1597 env1 = env1.next;
1598 }
1599
1600 attribStat(tree.body, env.dup(tree));
1601 result = null;
1602 }
1603
1604 public void visitSwitch(JCSwitch tree) {
1605 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1606 attribStats(c.stats, caseEnv);
1607 });
1608 result = null;
1609 }
1610
1611 public void visitSwitchExpression(JCSwitchExpression tree) {
1612 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1613 PolyKind.STANDALONE : PolyKind.POLY;
1614
1615 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1616 //this means we are returning a poly conditional from void-compatible lambda expression
1617 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1618 result = tree.type = types.createErrorType(resultInfo.pt);
1619 return;
1620 }
1621
1622 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1623 unknownExprInfo :
1624 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1625
1626 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1627 ListBuffer<Type> caseTypes = new ListBuffer<>();
1628
1629 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1630 caseEnv.info.yieldResult = condInfo;
1631 attribStats(c.stats, caseEnv);
1632 new TreeScanner() {
1633 @Override
1634 public void visitYield(JCYield brk) {
1635 if (brk.target == tree) {
1636 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1637 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1638 }
1639 super.visitYield(brk);
1640 }
1641
1642 @Override public void visitClassDef(JCClassDecl tree) {}
1643 @Override public void visitLambda(JCLambda tree) {}
1644 }.scan(c.stats);
1645 });
1646
1647 if (tree.cases.isEmpty()) {
1648 log.error(tree.pos(),
1649 Errors.SwitchExpressionEmpty);
1650 } else if (caseTypes.isEmpty()) {
1651 log.error(tree.pos(),
1652 Errors.SwitchExpressionNoResultExpressions);
1653 }
1654
1655 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1656
1657 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1658 }
1659 //where:
1660 CheckContext switchExpressionContext(CheckContext checkContext) {
1661 return new Check.NestedCheckContext(checkContext) {
1662 //this will use enclosing check context to check compatibility of
1663 //subexpression against target type; if we are in a method check context,
1664 //depending on whether boxing is allowed, we could have incompatibilities
1665 @Override
1666 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1667 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1668 }
1669 };
1670 }
1671
1672 private void handleSwitch(JCTree switchTree,
1673 JCExpression selector,
1674 List<JCCase> cases,
1675 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1676 Type seltype = attribExpr(selector, env);
1677
1678 Env<AttrContext> switchEnv =
1679 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1680
1681 try {
1682 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1683 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1684 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1685 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1686 boolean errorPrimitiveSwitch = seltype.isPrimitive() && !intSwitch;
1687 boolean patternSwitch;
1688 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1689 !intSwitch && !errorPrimitiveSwitch) {
1690 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1691 patternSwitch = true;
1692 } else {
1693 if (errorPrimitiveSwitch) {
1694 log.error(selector.pos(), Errors.SelectorTypeNotAllowed(seltype));
1695 }
1696 patternSwitch = cases.stream()
1697 .flatMap(c -> c.labels.stream())
1698 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1699 TreeInfo.isNullCaseLabel(l));
1700 }
1701
1702 // Attribute all cases and
1703 // check that there are no duplicate case labels or default clauses.
1704 Set<Object> constants = new HashSet<>(); // The set of case constants.
1705 boolean hasDefault = false; // Is there a default label?
1706 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1707 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1708 boolean hasNullPattern = false; // Is there a null pattern?
1709 CaseTree.CaseKind caseKind = null;
1710 boolean wasError = false;
1711 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1712 JCCase c = l.head;
1713 if (caseKind == null) {
1714 caseKind = c.caseKind;
1715 } else if (caseKind != c.caseKind && !wasError) {
1716 log.error(c.pos(),
1717 Errors.SwitchMixingCaseTypes);
1718 wasError = true;
1719 }
1720 MatchBindings currentBindings = null;
1721 MatchBindings guardBindings = null;
1722 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1723 JCCaseLabel label = labels.head;
1724 if (label instanceof JCConstantCaseLabel constLabel) {
1725 JCExpression expr = constLabel.expr;
1726 if (TreeInfo.isNull(expr)) {
1727 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1728 if (hasNullPattern) {
1729 log.error(label.pos(), Errors.DuplicateCaseLabel);
1730 }
1731 hasNullPattern = true;
1732 attribExpr(expr, switchEnv, seltype);
1733 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1734 } else if (enumSwitch) {
1735 Symbol sym = enumConstant(expr, seltype);
1736 if (sym == null) {
1737 if (allowPatternSwitch) {
1738 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1739 Symbol enumSym = TreeInfo.symbol(expr);
1740 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1741 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1742 } else if (!constants.add(enumSym)) {
1743 log.error(label.pos(), Errors.DuplicateCaseLabel);
1744 }
1745 } else {
1746 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1747 }
1748 } else if (!constants.add(sym)) {
1749 log.error(label.pos(), Errors.DuplicateCaseLabel);
1750 }
1751 } else if (errorEnumSwitch) {
1752 //error recovery: the selector is erroneous, and all the case labels
1753 //are identifiers. This could be an enum switch - don't report resolve
1754 //error for the case label:
1755 var prevResolveHelper = rs.basicLogResolveHelper;
1756 try {
1757 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1758 attribExpr(expr, switchEnv, seltype);
1759 } finally {
1760 rs.basicLogResolveHelper = prevResolveHelper;
1761 }
1762 } else {
1763 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1764 if (!pattype.hasTag(ERROR)) {
1765 if (pattype.constValue() == null) {
1766 Symbol s = TreeInfo.symbol(expr);
1767 if (s != null && s.kind == TYP) {
1768 log.error(expr.pos(),
1769 Errors.PatternExpected);
1770 } else if (s == null || !s.isEnum()) {
1771 log.error(expr.pos(),
1772 (stringSwitch ? Errors.StringConstReq
1773 : intSwitch ? Errors.ConstExprReq
1774 : Errors.PatternOrEnumReq));
1775 } else if (!constants.add(s)) {
1776 log.error(label.pos(), Errors.DuplicateCaseLabel);
1777 }
1778 } else if (!stringSwitch && !intSwitch && !errorPrimitiveSwitch) {
1779 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1780 } else if (!constants.add(pattype.constValue())) {
1781 log.error(c.pos(), Errors.DuplicateCaseLabel);
1782 }
1783 }
1784 }
1785 } else if (label instanceof JCDefaultCaseLabel def) {
1786 if (hasDefault) {
1787 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1788 } else if (hasUnconditionalPattern) {
1789 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1790 }
1791 hasDefault = true;
1792 matchBindings = MatchBindingsComputer.EMPTY;
1793 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1794 //pattern
1795 JCPattern pat = patternlabel.pat;
1796 attribExpr(pat, switchEnv, seltype);
1797 Type primaryType = TreeInfo.primaryPatternType(pat);
1798 if (!primaryType.hasTag(TYPEVAR)) {
1799 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1800 }
1801 if (!errorPrimitiveSwitch) {
1802 checkCastablePattern(pat.pos(), seltype, primaryType);
1803 }
1804 Type patternType = types.erasure(primaryType);
1805 JCExpression guard = c.guard;
1806 if (guardBindings == null && guard != null) {
1807 MatchBindings afterPattern = matchBindings;
1808 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1809 try {
1810 attribExpr(guard, bodyEnv, syms.booleanType);
1811 } finally {
1812 bodyEnv.info.scope.leave();
1813 }
1814
1815 guardBindings = matchBindings;
1816 matchBindings = afterPattern;
1817
1818 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1819 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1820 }
1821 }
1822 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1823 boolean unconditional =
1824 unguarded &&
1825 !patternType.isErroneous() &&
1826 types.isSubtype(types.boxedTypeOrType(types.erasure(seltype)),
1827 patternType);
1828 if (unconditional) {
1829 if (hasUnconditionalPattern) {
1830 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1831 } else if (hasDefault) {
1832 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1833 }
1834 hasUnconditionalPattern = true;
1835 }
1836 lastPatternErroneous = patternType.isErroneous();
1837 } else {
1838 Assert.error();
1839 }
1840 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1841 }
1842
1843 if (guardBindings != null) {
1844 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1845 }
1846
1847 Env<AttrContext> caseEnv =
1848 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1849 try {
1850 attribCase.accept(c, caseEnv);
1851 } finally {
1852 caseEnv.info.scope.leave();
1853 }
1854 addVars(c.stats, switchEnv.info.scope);
1855
1856 preFlow(c);
1857 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1858 }
1859 if (patternSwitch) {
1860 chk.checkSwitchCaseStructure(cases);
1861 chk.checkSwitchCaseLabelDominated(cases);
1862 }
1863 if (switchTree.hasTag(SWITCH)) {
1864 ((JCSwitch) switchTree).hasUnconditionalPattern =
1865 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1866 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1867 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1868 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1869 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1870 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1871 } else {
1872 Assert.error(switchTree.getTag().name());
1873 }
1874 } finally {
1875 switchEnv.info.scope.leave();
1876 }
1877 }
1878 // where
1879 private ResultInfo caseLabelResultInfo(Type seltype) {
1880 return new ResultInfo(KindSelector.VAL_TYP,
1881 !seltype.hasTag(ERROR) ? seltype
1882 : Type.noType);
1883 }
1884 /** Add any variables defined in stats to the switch scope. */
1885 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1886 for (;stats.nonEmpty(); stats = stats.tail) {
1887 JCTree stat = stats.head;
1888 if (stat.hasTag(VARDEF))
1889 switchScope.enter(((JCVariableDecl) stat).sym);
1890 }
1891 }
1892 // where
1893 /** Return the selected enumeration constant symbol, or null. */
1894 private Symbol enumConstant(JCTree tree, Type enumType) {
1895 if (tree.hasTag(IDENT)) {
1896 JCIdent ident = (JCIdent)tree;
1897 Name name = ident.name;
1898 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1899 if (sym.kind == VAR) {
1900 Symbol s = ident.sym = sym;
1901 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1902 ident.type = s.type;
1903 return ((s.flags_field & Flags.ENUM) == 0)
1904 ? null : s;
1905 }
1906 }
1907 }
1908 return null;
1909 }
1910
1911 public void visitSynchronized(JCSynchronized tree) {
1912 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1913 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1914 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1915 }
1916 attribStat(tree.body, env);
1917 result = null;
1918 }
1919 // where
1920 private boolean isValueBased(Type t) {
1921 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1922 }
1923
1924
1925 public void visitTry(JCTry tree) {
1926 // Create a new local environment with a local
1927 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1928 try {
1929 boolean isTryWithResource = tree.resources.nonEmpty();
1930 // Create a nested environment for attributing the try block if needed
1931 Env<AttrContext> tryEnv = isTryWithResource ?
1932 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1933 localEnv;
1934 try {
1935 // Attribute resource declarations
1936 for (JCTree resource : tree.resources) {
1937 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1938 @Override
1939 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1940 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1941 }
1942 };
1943 ResultInfo twrResult =
1944 new ResultInfo(KindSelector.VAR,
1945 syms.autoCloseableType,
1946 twrContext);
1947 if (resource.hasTag(VARDEF)) {
1948 attribStat(resource, tryEnv);
1949 twrResult.check(resource, resource.type);
1950
1951 //check that resource type cannot throw InterruptedException
1952 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1953
1954 VarSymbol var = ((JCVariableDecl) resource).sym;
1955
1956 var.flags_field |= Flags.FINAL;
1957 var.setData(ElementKind.RESOURCE_VARIABLE);
1958 } else {
1959 attribTree(resource, tryEnv, twrResult);
1960 }
1961 }
1962 // Attribute body
1963 attribStat(tree.body, tryEnv);
1964 } finally {
1965 if (isTryWithResource)
1966 tryEnv.info.scope.leave();
1967 }
1968
1969 // Attribute catch clauses
1970 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1971 JCCatch c = l.head;
1972 Env<AttrContext> catchEnv =
1973 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1974 try {
1975 Type ctype = attribStat(c.param, catchEnv);
1976 if (TreeInfo.isMultiCatch(c)) {
1977 //multi-catch parameter is implicitly marked as final
1978 c.param.sym.flags_field |= FINAL | UNION;
1979 }
1980 if (c.param.sym.kind == VAR) {
1981 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1982 }
1983 chk.checkType(c.param.vartype.pos(),
1984 chk.checkClassType(c.param.vartype.pos(), ctype),
1985 syms.throwableType);
1986 attribStat(c.body, catchEnv);
1987 } finally {
1988 catchEnv.info.scope.leave();
1989 }
1990 }
1991
1992 // Attribute finalizer
1993 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1994 result = null;
1995 }
1996 finally {
1997 localEnv.info.scope.leave();
1998 }
1999 }
2000
2001 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2002 if (!resource.isErroneous() &&
2003 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2004 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2005 Symbol close = syms.noSymbol;
2006 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2007 try {
2008 close = rs.resolveQualifiedMethod(pos,
2009 env,
2010 types.skipTypeVars(resource, false),
2011 names.close,
2012 List.nil(),
2013 List.nil());
2014 }
2015 finally {
2016 log.popDiagnosticHandler(discardHandler);
2017 }
2018 if (close.kind == MTH &&
2019 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2020 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2021 env.info.lint.isEnabled(LintCategory.TRY)) {
2022 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2023 }
2024 }
2025 }
2026
2027 public void visitConditional(JCConditional tree) {
2028 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2029 MatchBindings condBindings = matchBindings;
2030
2031 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2032 isBooleanOrNumeric(env, tree)) ?
2033 PolyKind.STANDALONE : PolyKind.POLY;
2034
2035 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2036 //this means we are returning a poly conditional from void-compatible lambda expression
2037 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2038 result = tree.type = types.createErrorType(resultInfo.pt);
2039 return;
2040 }
2041
2042 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2043 unknownExprInfo :
2044 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2045
2046
2047 // x ? y : z
2048 // include x's bindings when true in y
2049 // include x's bindings when false in z
2050
2051 Type truetype;
2052 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2053 try {
2054 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2055 } finally {
2056 trueEnv.info.scope.leave();
2057 }
2058
2059 MatchBindings trueBindings = matchBindings;
2060
2061 Type falsetype;
2062 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2063 try {
2064 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2065 } finally {
2066 falseEnv.info.scope.leave();
2067 }
2068
2069 MatchBindings falseBindings = matchBindings;
2070
2071 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2072 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2073 List.of(truetype, falsetype)) : pt();
2074 if (condtype.constValue() != null &&
2075 truetype.constValue() != null &&
2076 falsetype.constValue() != null &&
2077 !owntype.hasTag(NONE)) {
2078 //constant folding
2079 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2080 }
2081 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2082 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2083 }
2084 //where
2085 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2086 switch (tree.getTag()) {
2087 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2088 ((JCLiteral)tree).typetag == BOOLEAN ||
2089 ((JCLiteral)tree).typetag == BOT;
2090 case LAMBDA: case REFERENCE: return false;
2091 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2092 case CONDEXPR:
2093 JCConditional condTree = (JCConditional)tree;
2094 return isBooleanOrNumeric(env, condTree.truepart) &&
2095 isBooleanOrNumeric(env, condTree.falsepart);
2096 case APPLY:
2097 JCMethodInvocation speculativeMethodTree =
2098 (JCMethodInvocation)deferredAttr.attribSpeculative(
2099 tree, env, unknownExprInfo,
2100 argumentAttr.withLocalCacheContext());
2101 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2102 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2103 env.enclClass.type :
2104 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2105 Type owntype = types.memberType(receiverType, msym).getReturnType();
2106 return primitiveOrBoxed(owntype);
2107 case NEWCLASS:
2108 JCExpression className =
2109 removeClassParams.translate(((JCNewClass)tree).clazz);
2110 JCExpression speculativeNewClassTree =
2111 (JCExpression)deferredAttr.attribSpeculative(
2112 className, env, unknownTypeInfo,
2113 argumentAttr.withLocalCacheContext());
2114 return primitiveOrBoxed(speculativeNewClassTree.type);
2115 default:
2116 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2117 argumentAttr.withLocalCacheContext()).type;
2118 return primitiveOrBoxed(speculativeType);
2119 }
2120 }
2121 //where
2122 boolean primitiveOrBoxed(Type t) {
2123 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2124 }
2125
2126 TreeTranslator removeClassParams = new TreeTranslator() {
2127 @Override
2128 public void visitTypeApply(JCTypeApply tree) {
2129 result = translate(tree.clazz);
2130 }
2131 };
2132
2133 CheckContext conditionalContext(CheckContext checkContext) {
2134 return new Check.NestedCheckContext(checkContext) {
2135 //this will use enclosing check context to check compatibility of
2136 //subexpression against target type; if we are in a method check context,
2137 //depending on whether boxing is allowed, we could have incompatibilities
2138 @Override
2139 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2140 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2141 }
2142 };
2143 }
2144
2145 /** Compute the type of a conditional expression, after
2146 * checking that it exists. See JLS 15.25. Does not take into
2147 * account the special case where condition and both arms
2148 * are constants.
2149 *
2150 * @param pos The source position to be used for error
2151 * diagnostics.
2152 * @param thentype The type of the expression's then-part.
2153 * @param elsetype The type of the expression's else-part.
2154 */
2155 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2156 if (condTypes.isEmpty()) {
2157 return syms.objectType; //TODO: how to handle?
2158 }
2159 Type first = condTypes.head;
2160 // If same type, that is the result
2161 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2162 return first.baseType();
2163
2164 List<Type> unboxedTypes = condTypes.stream()
2165 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2166 .collect(List.collector());
2167
2168 // Otherwise, if both arms can be converted to a numeric
2169 // type, return the least numeric type that fits both arms
2170 // (i.e. return larger of the two, or return int if one
2171 // arm is short, the other is char).
2172 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2173 // If one arm has an integer subrange type (i.e., byte,
2174 // short, or char), and the other is an integer constant
2175 // that fits into the subrange, return the subrange type.
2176 for (Type type : unboxedTypes) {
2177 if (!type.getTag().isStrictSubRangeOf(INT)) {
2178 continue;
2179 }
2180 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2181 return type.baseType();
2182 }
2183
2184 for (TypeTag tag : primitiveTags) {
2185 Type candidate = syms.typeOfTag[tag.ordinal()];
2186 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2187 return candidate;
2188 }
2189 }
2190 }
2191
2192 // Those were all the cases that could result in a primitive
2193 condTypes = condTypes.stream()
2194 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2195 .collect(List.collector());
2196
2197 for (Type type : condTypes) {
2198 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2199 return type.baseType();
2200 }
2201
2202 Iterator<DiagnosticPosition> posIt = positions.iterator();
2203
2204 condTypes = condTypes.stream()
2205 .map(t -> chk.checkNonVoid(posIt.next(), t))
2206 .collect(List.collector());
2207
2208 // both are known to be reference types. The result is
2209 // lub(thentype,elsetype). This cannot fail, as it will
2210 // always be possible to infer "Object" if nothing better.
2211 return types.lub(condTypes.stream()
2212 .map(t -> t.baseType())
2213 .filter(t -> !t.hasTag(BOT))
2214 .collect(List.collector()));
2215 }
2216
2217 static final TypeTag[] primitiveTags = new TypeTag[]{
2218 BYTE,
2219 CHAR,
2220 SHORT,
2221 INT,
2222 LONG,
2223 FLOAT,
2224 DOUBLE,
2225 BOOLEAN,
2226 };
2227
2228 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2229 return bindingEnv(env, env.tree, bindings);
2230 }
2231
2232 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2233 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2234 bindings.forEach(env1.info.scope::enter);
2235 return env1;
2236 }
2237
2238 public void visitIf(JCIf tree) {
2239 attribExpr(tree.cond, env, syms.booleanType);
2240
2241 // if (x) { y } [ else z ]
2242 // include x's bindings when true in y
2243 // include x's bindings when false in z
2244
2245 MatchBindings condBindings = matchBindings;
2246 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2247
2248 try {
2249 attribStat(tree.thenpart, thenEnv);
2250 } finally {
2251 thenEnv.info.scope.leave();
2252 }
2253
2254 preFlow(tree.thenpart);
2255 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2256 boolean aliveAfterElse;
2257
2258 if (tree.elsepart != null) {
2259 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2260 try {
2261 attribStat(tree.elsepart, elseEnv);
2262 } finally {
2263 elseEnv.info.scope.leave();
2264 }
2265 preFlow(tree.elsepart);
2266 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2267 } else {
2268 aliveAfterElse = true;
2269 }
2270
2271 chk.checkEmptyIf(tree);
2272
2273 List<BindingSymbol> afterIfBindings = List.nil();
2274
2275 if (aliveAfterThen && !aliveAfterElse) {
2276 afterIfBindings = condBindings.bindingsWhenTrue;
2277 } else if (aliveAfterElse && !aliveAfterThen) {
2278 afterIfBindings = condBindings.bindingsWhenFalse;
2279 }
2280
2281 addBindings2Scope(tree, afterIfBindings);
2282
2283 result = null;
2284 }
2285
2286 void preFlow(JCTree tree) {
2287 attrRecover.doRecovery();
2288 new PostAttrAnalyzer() {
2289 @Override
2290 public void scan(JCTree tree) {
2291 if (tree == null ||
2292 (tree.type != null &&
2293 tree.type == Type.stuckType)) {
2294 //don't touch stuck expressions!
2295 return;
2296 }
2297 super.scan(tree);
2298 }
2299
2300 @Override
2301 public void visitClassDef(JCClassDecl that) {
2302 if (that.sym != null) {
2303 // Method preFlow shouldn't visit class definitions
2304 // that have not been entered and attributed.
2305 // See JDK-8254557 and JDK-8203277 for more details.
2306 super.visitClassDef(that);
2307 }
2308 }
2309
2310 @Override
2311 public void visitLambda(JCLambda that) {
2312 if (that.type != null) {
2313 // Method preFlow shouldn't visit lambda expressions
2314 // that have not been entered and attributed.
2315 // See JDK-8254557 and JDK-8203277 for more details.
2316 super.visitLambda(that);
2317 }
2318 }
2319 }.scan(tree);
2320 }
2321
2322 public void visitExec(JCExpressionStatement tree) {
2323 //a fresh environment is required for 292 inference to work properly ---
2324 //see Infer.instantiatePolymorphicSignatureInstance()
2325 Env<AttrContext> localEnv = env.dup(tree);
2326 attribExpr(tree.expr, localEnv);
2327 result = null;
2328 }
2329
2330 public void visitBreak(JCBreak tree) {
2331 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2332 result = null;
2333 }
2334
2335 public void visitYield(JCYield tree) {
2336 if (env.info.yieldResult != null) {
2337 attribTree(tree.value, env, env.info.yieldResult);
2338 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2339 } else {
2340 log.error(tree.pos(), tree.value.hasTag(PARENS)
2341 ? Errors.NoSwitchExpressionQualify
2342 : Errors.NoSwitchExpression);
2343 attribTree(tree.value, env, unknownExprInfo);
2344 }
2345 result = null;
2346 }
2347
2348 public void visitContinue(JCContinue tree) {
2349 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2350 result = null;
2351 }
2352 //where
2353 /** Return the target of a break, continue or yield statement,
2354 * if it exists, report an error if not.
2355 * Note: The target of a labelled break or continue is the
2356 * (non-labelled) statement tree referred to by the label,
2357 * not the tree representing the labelled statement itself.
2358 *
2359 * @param pos The position to be used for error diagnostics
2360 * @param tag The tag of the jump statement. This is either
2361 * Tree.BREAK or Tree.CONTINUE.
2362 * @param label The label of the jump statement, or null if no
2363 * label is given.
2364 * @param env The environment current at the jump statement.
2365 */
2366 private JCTree findJumpTarget(DiagnosticPosition pos,
2367 JCTree.Tag tag,
2368 Name label,
2369 Env<AttrContext> env) {
2370 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2371
2372 if (jumpTarget.snd != null) {
2373 log.error(pos, jumpTarget.snd);
2374 }
2375
2376 return jumpTarget.fst;
2377 }
2378 /** Return the target of a break or continue statement, if it exists,
2379 * report an error if not.
2380 * Note: The target of a labelled break or continue is the
2381 * (non-labelled) statement tree referred to by the label,
2382 * not the tree representing the labelled statement itself.
2383 *
2384 * @param tag The tag of the jump statement. This is either
2385 * Tree.BREAK or Tree.CONTINUE.
2386 * @param label The label of the jump statement, or null if no
2387 * label is given.
2388 * @param env The environment current at the jump statement.
2389 */
2390 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2391 Name label,
2392 Env<AttrContext> env) {
2393 // Search environments outwards from the point of jump.
2394 Env<AttrContext> env1 = env;
2395 JCDiagnostic.Error pendingError = null;
2396 LOOP:
2397 while (env1 != null) {
2398 switch (env1.tree.getTag()) {
2399 case LABELLED:
2400 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2401 if (label == labelled.label) {
2402 // If jump is a continue, check that target is a loop.
2403 if (tag == CONTINUE) {
2404 if (!labelled.body.hasTag(DOLOOP) &&
2405 !labelled.body.hasTag(WHILELOOP) &&
2406 !labelled.body.hasTag(FORLOOP) &&
2407 !labelled.body.hasTag(FOREACHLOOP)) {
2408 pendingError = Errors.NotLoopLabel(label);
2409 }
2410 // Found labelled statement target, now go inwards
2411 // to next non-labelled tree.
2412 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2413 } else {
2414 return Pair.of(labelled, pendingError);
2415 }
2416 }
2417 break;
2418 case DOLOOP:
2419 case WHILELOOP:
2420 case FORLOOP:
2421 case FOREACHLOOP:
2422 if (label == null) return Pair.of(env1.tree, pendingError);
2423 break;
2424 case SWITCH:
2425 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2426 break;
2427 case SWITCH_EXPRESSION:
2428 if (tag == YIELD) {
2429 return Pair.of(env1.tree, null);
2430 } else if (tag == BREAK) {
2431 pendingError = Errors.BreakOutsideSwitchExpression;
2432 } else {
2433 pendingError = Errors.ContinueOutsideSwitchExpression;
2434 }
2435 break;
2436 case LAMBDA:
2437 case METHODDEF:
2438 case CLASSDEF:
2439 break LOOP;
2440 default:
2441 }
2442 env1 = env1.next;
2443 }
2444 if (label != null)
2445 return Pair.of(null, Errors.UndefLabel(label));
2446 else if (pendingError != null)
2447 return Pair.of(null, pendingError);
2448 else if (tag == CONTINUE)
2449 return Pair.of(null, Errors.ContOutsideLoop);
2450 else
2451 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2452 }
2453
2454 public void visitReturn(JCReturn tree) {
2455 // Check that there is an enclosing method which is
2456 // nested within than the enclosing class.
2457 if (env.info.returnResult == null) {
2458 log.error(tree.pos(), Errors.RetOutsideMeth);
2459 } else if (env.info.yieldResult != null) {
2460 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2461 } else if (!env.info.isLambda &&
2462 !env.info.isNewClass &&
2463 env.enclMethod != null &&
2464 TreeInfo.isCompactConstructor(env.enclMethod)) {
2465 log.error(env.enclMethod,
2466 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2467 } else {
2468 // Attribute return expression, if it exists, and check that
2469 // it conforms to result type of enclosing method.
2470 if (tree.expr != null) {
2471 if (env.info.returnResult.pt.hasTag(VOID)) {
2472 env.info.returnResult.checkContext.report(tree.expr.pos(),
2473 diags.fragment(Fragments.UnexpectedRetVal));
2474 }
2475 attribTree(tree.expr, env, env.info.returnResult);
2476 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2477 !env.info.returnResult.pt.hasTag(NONE)) {
2478 env.info.returnResult.checkContext.report(tree.pos(),
2479 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2480 }
2481 }
2482 result = null;
2483 }
2484
2485 public void visitThrow(JCThrow tree) {
2486 Type owntype = attribExpr(tree.expr, env, Type.noType);
2487 chk.checkType(tree, owntype, syms.throwableType);
2488 result = null;
2489 }
2490
2491 public void visitAssert(JCAssert tree) {
2492 attribExpr(tree.cond, env, syms.booleanType);
2493 if (tree.detail != null) {
2494 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2495 }
2496 result = null;
2497 }
2498
2499 /** Visitor method for method invocations.
2500 * NOTE: The method part of an application will have in its type field
2501 * the return type of the method, not the method's type itself!
2502 */
2503 public void visitApply(JCMethodInvocation tree) {
2504 // The local environment of a method application is
2505 // a new environment nested in the current one.
2506 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2507
2508 // The types of the actual method arguments.
2509 List<Type> argtypes;
2510
2511 // The types of the actual method type arguments.
2512 List<Type> typeargtypes = null;
2513
2514 Name methName = TreeInfo.name(tree.meth);
2515
2516 boolean isConstructorCall =
2517 methName == names._this || methName == names._super;
2518
2519 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2520 if (isConstructorCall) {
2521 // We are seeing a ...this(...) or ...super(...) call.
2522 // Check that this is the first statement in a constructor.
2523 checkFirstConstructorStat(tree, env.enclMethod, true);
2524
2525 // Record the fact
2526 // that this is a constructor call (using isSelfCall).
2527 localEnv.info.isSelfCall = true;
2528
2529 // Attribute arguments, yielding list of argument types.
2530 localEnv.info.constructorArgs = true;
2531 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2532 localEnv.info.constructorArgs = false;
2533 argtypes = argtypesBuf.toList();
2534 typeargtypes = attribTypes(tree.typeargs, localEnv);
2535
2536 // Variable `site' points to the class in which the called
2537 // constructor is defined.
2538 Type site = env.enclClass.sym.type;
2539 if (methName == names._super) {
2540 if (site == syms.objectType) {
2541 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2542 site = types.createErrorType(syms.objectType);
2543 } else {
2544 site = types.supertype(site);
2545 }
2546 }
2547
2548 if (site.hasTag(CLASS)) {
2549 Type encl = site.getEnclosingType();
2550 while (encl != null && encl.hasTag(TYPEVAR))
2551 encl = encl.getUpperBound();
2552 if (encl.hasTag(CLASS)) {
2553 // we are calling a nested class
2554
2555 if (tree.meth.hasTag(SELECT)) {
2556 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2557
2558 // We are seeing a prefixed call, of the form
2559 // <expr>.super(...).
2560 // Check that the prefix expression conforms
2561 // to the outer instance type of the class.
2562 chk.checkRefType(qualifier.pos(),
2563 attribExpr(qualifier, localEnv,
2564 encl));
2565 } else if (methName == names._super) {
2566 // qualifier omitted; check for existence
2567 // of an appropriate implicit qualifier.
2568 rs.resolveImplicitThis(tree.meth.pos(),
2569 localEnv, site, true);
2570 }
2571 } else if (tree.meth.hasTag(SELECT)) {
2572 log.error(tree.meth.pos(),
2573 Errors.IllegalQualNotIcls(site.tsym));
2574 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2575 }
2576
2577 // if we're calling a java.lang.Enum constructor,
2578 // prefix the implicit String and int parameters
2579 if (site.tsym == syms.enumSym)
2580 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2581
2582 // Resolve the called constructor under the assumption
2583 // that we are referring to a superclass instance of the
2584 // current instance (JLS ???).
2585 boolean selectSuperPrev = localEnv.info.selectSuper;
2586 localEnv.info.selectSuper = true;
2587 localEnv.info.pendingResolutionPhase = null;
2588 Symbol sym = rs.resolveConstructor(
2589 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2590 localEnv.info.selectSuper = selectSuperPrev;
2591
2592 // Set method symbol to resolved constructor...
2593 TreeInfo.setSymbol(tree.meth, sym);
2594
2595 // ...and check that it is legal in the current context.
2596 // (this will also set the tree's type)
2597 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2598 checkId(tree.meth, site, sym, localEnv,
2599 new ResultInfo(kind, mpt));
2600 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2601 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2602 }
2603 // Otherwise, `site' is an error type and we do nothing
2604 result = tree.type = syms.voidType;
2605 } else {
2606 // Otherwise, we are seeing a regular method call.
2607 // Attribute the arguments, yielding list of argument types, ...
2608 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2609 argtypes = argtypesBuf.toList();
2610 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2611
2612 // ... and attribute the method using as a prototype a methodtype
2613 // whose formal argument types is exactly the list of actual
2614 // arguments (this will also set the method symbol).
2615 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2616 localEnv.info.pendingResolutionPhase = null;
2617 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2618
2619 // Compute the result type.
2620 Type restype = mtype.getReturnType();
2621 if (restype.hasTag(WILDCARD))
2622 throw new AssertionError(mtype);
2623
2624 Type qualifier = (tree.meth.hasTag(SELECT))
2625 ? ((JCFieldAccess) tree.meth).selected.type
2626 : env.enclClass.sym.type;
2627 Symbol msym = TreeInfo.symbol(tree.meth);
2628 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2629
2630 chk.checkRefTypes(tree.typeargs, typeargtypes);
2631
2632 // Check that value of resulting type is admissible in the
2633 // current context. Also, capture the return type
2634 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2635 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2636 }
2637 chk.validate(tree.typeargs, localEnv);
2638 }
2639 //where
2640 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2641 if (msym != null &&
2642 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2643 methodName == names.getClass &&
2644 argtypes.isEmpty()) {
2645 // as a special case, x.getClass() has type Class<? extends |X|>
2646 return new ClassType(restype.getEnclosingType(),
2647 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2648 BoundKind.EXTENDS,
2649 syms.boundClass)),
2650 restype.tsym,
2651 restype.getMetadata());
2652 } else if (msym != null &&
2653 msym.owner == syms.arrayClass &&
2654 methodName == names.clone &&
2655 types.isArray(qualifierType)) {
2656 // as a special case, array.clone() has a result that is
2657 // the same as static type of the array being cloned
2658 return qualifierType;
2659 } else {
2660 return restype;
2661 }
2662 }
2663
2664 /** Check that given application node appears as first statement
2665 * in a constructor call.
2666 * @param tree The application node
2667 * @param enclMethod The enclosing method of the application.
2668 * @param error Should an error be issued?
2669 */
2670 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2671 if (enclMethod != null && enclMethod.name == names.init) {
2672 JCBlock body = enclMethod.body;
2673 if (body.stats.head.hasTag(EXEC) &&
2674 ((JCExpressionStatement) body.stats.head).expr == tree)
2675 return true;
2676 }
2677 if (error) {
2678 log.error(tree.pos(),
2679 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2680 }
2681 return false;
2682 }
2683
2684 /** Obtain a method type with given argument types.
2685 */
2686 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2687 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2688 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2689 }
2690
2691 public void visitNewClass(final JCNewClass tree) {
2692 Type owntype = types.createErrorType(tree.type);
2693
2694 // The local environment of a class creation is
2695 // a new environment nested in the current one.
2696 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2697
2698 // The anonymous inner class definition of the new expression,
2699 // if one is defined by it.
2700 JCClassDecl cdef = tree.def;
2701
2702 // If enclosing class is given, attribute it, and
2703 // complete class name to be fully qualified
2704 JCExpression clazz = tree.clazz; // Class field following new
2705 JCExpression clazzid; // Identifier in class field
2706 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2707 annoclazzid = null;
2708
2709 if (clazz.hasTag(TYPEAPPLY)) {
2710 clazzid = ((JCTypeApply) clazz).clazz;
2711 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2712 annoclazzid = (JCAnnotatedType) clazzid;
2713 clazzid = annoclazzid.underlyingType;
2714 }
2715 } else {
2716 if (clazz.hasTag(ANNOTATED_TYPE)) {
2717 annoclazzid = (JCAnnotatedType) clazz;
2718 clazzid = annoclazzid.underlyingType;
2719 } else {
2720 clazzid = clazz;
2721 }
2722 }
2723
2724 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2725
2726 if (tree.encl != null) {
2727 // We are seeing a qualified new, of the form
2728 // <expr>.new C <...> (...) ...
2729 // In this case, we let clazz stand for the name of the
2730 // allocated class C prefixed with the type of the qualifier
2731 // expression, so that we can
2732 // resolve it with standard techniques later. I.e., if
2733 // <expr> has type T, then <expr>.new C <...> (...)
2734 // yields a clazz T.C.
2735 Type encltype = chk.checkRefType(tree.encl.pos(),
2736 attribExpr(tree.encl, env));
2737 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2738 // from expr to the combined type, or not? Yes, do this.
2739 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2740 ((JCIdent) clazzid).name);
2741
2742 EndPosTable endPosTable = this.env.toplevel.endPositions;
2743 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2744 if (clazz.hasTag(ANNOTATED_TYPE)) {
2745 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2746 List<JCAnnotation> annos = annoType.annotations;
2747
2748 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2749 clazzid1 = make.at(tree.pos).
2750 TypeApply(clazzid1,
2751 ((JCTypeApply) clazz).arguments);
2752 }
2753
2754 clazzid1 = make.at(tree.pos).
2755 AnnotatedType(annos, clazzid1);
2756 } else if (clazz.hasTag(TYPEAPPLY)) {
2757 clazzid1 = make.at(tree.pos).
2758 TypeApply(clazzid1,
2759 ((JCTypeApply) clazz).arguments);
2760 }
2761
2762 clazz = clazzid1;
2763 }
2764
2765 // Attribute clazz expression and store
2766 // symbol + type back into the attributed tree.
2767 Type clazztype;
2768
2769 try {
2770 env.info.isNewClass = true;
2771 clazztype = TreeInfo.isEnumInit(env.tree) ?
2772 attribIdentAsEnumType(env, (JCIdent)clazz) :
2773 attribType(clazz, env);
2774 } finally {
2775 env.info.isNewClass = false;
2776 }
2777
2778 clazztype = chk.checkDiamond(tree, clazztype);
2779 chk.validate(clazz, localEnv);
2780 if (tree.encl != null) {
2781 // We have to work in this case to store
2782 // symbol + type back into the attributed tree.
2783 tree.clazz.type = clazztype;
2784 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2785 clazzid.type = ((JCIdent) clazzid).sym.type;
2786 if (annoclazzid != null) {
2787 annoclazzid.type = clazzid.type;
2788 }
2789 if (!clazztype.isErroneous()) {
2790 if (cdef != null && clazztype.tsym.isInterface()) {
2791 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2792 } else if (clazztype.tsym.isStatic()) {
2793 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2794 }
2795 }
2796 } else if (!clazztype.tsym.isInterface() &&
2797 clazztype.getEnclosingType().hasTag(CLASS)) {
2798 // Check for the existence of an apropos outer instance
2799 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2800 }
2801
2802 // Attribute constructor arguments.
2803 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2804 final KindSelector pkind =
2805 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2806 List<Type> argtypes = argtypesBuf.toList();
2807 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2808
2809 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2810 // Enums may not be instantiated except implicitly
2811 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2812 (!env.tree.hasTag(VARDEF) ||
2813 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2814 ((JCVariableDecl) env.tree).init != tree))
2815 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2816
2817 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2818 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2819 boolean skipNonDiamondPath = false;
2820 // Check that class is not abstract
2821 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2822 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2823 log.error(tree.pos(),
2824 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2825 skipNonDiamondPath = true;
2826 } else if (cdef != null && clazztype.tsym.isInterface()) {
2827 // Check that no constructor arguments are given to
2828 // anonymous classes implementing an interface
2829 if (!argtypes.isEmpty())
2830 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2831
2832 if (!typeargtypes.isEmpty())
2833 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2834
2835 // Error recovery: pretend no arguments were supplied.
2836 argtypes = List.nil();
2837 typeargtypes = List.nil();
2838 skipNonDiamondPath = true;
2839 }
2840 if (TreeInfo.isDiamond(tree)) {
2841 ClassType site = new ClassType(clazztype.getEnclosingType(),
2842 clazztype.tsym.type.getTypeArguments(),
2843 clazztype.tsym,
2844 clazztype.getMetadata());
2845
2846 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2847 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2848 diamondEnv.info.pendingResolutionPhase = null;
2849
2850 //if the type of the instance creation expression is a class type
2851 //apply method resolution inference (JLS 15.12.2.7). The return type
2852 //of the resolved constructor will be a partially instantiated type
2853 Symbol constructor = rs.resolveDiamond(tree.pos(),
2854 diamondEnv,
2855 site,
2856 argtypes,
2857 typeargtypes);
2858 tree.constructor = constructor.baseSymbol();
2859
2860 final TypeSymbol csym = clazztype.tsym;
2861 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2862 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2863 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2864 constructorType = checkId(tree, site,
2865 constructor,
2866 diamondEnv,
2867 diamondResult);
2868
2869 tree.clazz.type = types.createErrorType(clazztype);
2870 if (!constructorType.isErroneous()) {
2871 tree.clazz.type = clazz.type = constructorType.getReturnType();
2872 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2873 }
2874 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2875 }
2876
2877 // Resolve the called constructor under the assumption
2878 // that we are referring to a superclass instance of the
2879 // current instance (JLS ???).
2880 else if (!skipNonDiamondPath) {
2881 //the following code alters some of the fields in the current
2882 //AttrContext - hence, the current context must be dup'ed in
2883 //order to avoid downstream failures
2884 Env<AttrContext> rsEnv = localEnv.dup(tree);
2885 rsEnv.info.selectSuper = cdef != null;
2886 rsEnv.info.pendingResolutionPhase = null;
2887 tree.constructor = rs.resolveConstructor(
2888 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2889 if (cdef == null) { //do not check twice!
2890 tree.constructorType = checkId(tree,
2891 clazztype,
2892 tree.constructor,
2893 rsEnv,
2894 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2895 if (rsEnv.info.lastResolveVarargs())
2896 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2897 }
2898 }
2899
2900 if (cdef != null) {
2901 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2902 return;
2903 }
2904
2905 if (tree.constructor != null && tree.constructor.kind == MTH)
2906 owntype = clazztype;
2907 }
2908 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2909 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2910 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2911 //we need to wait for inference to finish and then replace inference vars in the constructor type
2912 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2913 instantiatedContext -> {
2914 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2915 });
2916 }
2917 chk.validate(tree.typeargs, localEnv);
2918 }
2919
2920 // where
2921 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2922 JCClassDecl cdef, Env<AttrContext> localEnv,
2923 List<Type> argtypes, List<Type> typeargtypes,
2924 KindSelector pkind) {
2925 // We are seeing an anonymous class instance creation.
2926 // In this case, the class instance creation
2927 // expression
2928 //
2929 // E.new <typeargs1>C<typargs2>(args) { ... }
2930 //
2931 // is represented internally as
2932 //
2933 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2934 //
2935 // This expression is then *transformed* as follows:
2936 //
2937 // (1) add an extends or implements clause
2938 // (2) add a constructor.
2939 //
2940 // For instance, if C is a class, and ET is the type of E,
2941 // the expression
2942 //
2943 // E.new <typeargs1>C<typargs2>(args) { ... }
2944 //
2945 // is translated to (where X is a fresh name and typarams is the
2946 // parameter list of the super constructor):
2947 //
2948 // new <typeargs1>X(<*nullchk*>E, args) where
2949 // X extends C<typargs2> {
2950 // <typarams> X(ET e, args) {
2951 // e.<typeargs1>super(args)
2952 // }
2953 // ...
2954 // }
2955 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2956 Type enclType = clazztype.getEnclosingType();
2957 if (enclType != null &&
2958 enclType.hasTag(CLASS) &&
2959 !chk.checkDenotable((ClassType)enclType)) {
2960 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2961 }
2962 final boolean isDiamond = TreeInfo.isDiamond(tree);
2963 if (isDiamond
2964 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2965 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2966 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2967 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2968 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2969 instantiatedContext -> {
2970 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2971 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2972 ResultInfo prevResult = this.resultInfo;
2973 try {
2974 this.resultInfo = resultInfoForClassDefinition;
2975 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2976 dupLocalEnv, argtypes, typeargtypes, pkind);
2977 } finally {
2978 this.resultInfo = prevResult;
2979 }
2980 });
2981 } else {
2982 if (isDiamond && clazztype.hasTag(CLASS)) {
2983 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2984 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2985 // One or more types inferred in the previous steps is non-denotable.
2986 Fragment fragment = Diamond(clazztype.tsym);
2987 log.error(tree.clazz.pos(),
2988 Errors.CantApplyDiamond1(
2989 fragment,
2990 invalidDiamondArgs.size() > 1 ?
2991 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2992 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2993 }
2994 // For <>(){}, inferred types must also be accessible.
2995 for (Type t : clazztype.getTypeArguments()) {
2996 rs.checkAccessibleType(env, t);
2997 }
2998 }
2999
3000 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3001 // false for isInterface call even when the original type is an interface.
3002 boolean implementing = clazztype.tsym.isInterface() ||
3003 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3004 clazztype.getOriginalType().tsym.isInterface();
3005
3006 if (implementing) {
3007 cdef.implementing = List.of(clazz);
3008 } else {
3009 cdef.extending = clazz;
3010 }
3011
3012 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3013 rs.isSerializable(clazztype)) {
3014 localEnv.info.isSerializable = true;
3015 }
3016
3017 attribStat(cdef, localEnv);
3018
3019 List<Type> finalargtypes;
3020 // If an outer instance is given,
3021 // prefix it to the constructor arguments
3022 // and delete it from the new expression
3023 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3024 finalargtypes = argtypes.prepend(tree.encl.type);
3025 } else {
3026 finalargtypes = argtypes;
3027 }
3028
3029 // Reassign clazztype and recompute constructor. As this necessarily involves
3030 // another attribution pass for deferred types in the case of <>, replicate
3031 // them. Original arguments have right decorations already.
3032 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3033 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3034 }
3035
3036 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3037 : cdef.sym.type;
3038 Symbol sym = tree.constructor = rs.resolveConstructor(
3039 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3040 Assert.check(!sym.kind.isResolutionError());
3041 tree.constructor = sym;
3042 tree.constructorType = checkId(tree,
3043 clazztype,
3044 tree.constructor,
3045 localEnv,
3046 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3047 }
3048 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3049 clazztype : types.createErrorType(tree.type);
3050 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3051 chk.validate(tree.typeargs, localEnv);
3052 }
3053
3054 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3055 return new Check.NestedCheckContext(checkContext) {
3056 @Override
3057 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3058 enclosingContext.report(clazz.clazz,
3059 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3060 }
3061 };
3062 }
3063
3064 /** Make an attributed null check tree.
3065 */
3066 public JCExpression makeNullCheck(JCExpression arg) {
3067 // optimization: new Outer() can never be null; skip null check
3068 if (arg.getTag() == NEWCLASS)
3069 return arg;
3070 // optimization: X.this is never null; skip null check
3071 Name name = TreeInfo.name(arg);
3072 if (name == names._this || name == names._super) return arg;
3073
3074 JCTree.Tag optag = NULLCHK;
3075 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3076 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3077 tree.type = arg.type;
3078 return tree;
3079 }
3080
3081 public void visitNewArray(JCNewArray tree) {
3082 Type owntype = types.createErrorType(tree.type);
3083 Env<AttrContext> localEnv = env.dup(tree);
3084 Type elemtype;
3085 if (tree.elemtype != null) {
3086 elemtype = attribType(tree.elemtype, localEnv);
3087 chk.validate(tree.elemtype, localEnv);
3088 owntype = elemtype;
3089 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3090 attribExpr(l.head, localEnv, syms.intType);
3091 owntype = new ArrayType(owntype, syms.arrayClass);
3092 }
3093 } else {
3094 // we are seeing an untyped aggregate { ... }
3095 // this is allowed only if the prototype is an array
3096 if (pt().hasTag(ARRAY)) {
3097 elemtype = types.elemtype(pt());
3098 } else {
3099 if (!pt().hasTag(ERROR) &&
3100 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3101 log.error(tree.pos(),
3102 Errors.IllegalInitializerForType(pt()));
3103 }
3104 elemtype = types.createErrorType(pt());
3105 }
3106 }
3107 if (tree.elems != null) {
3108 attribExprs(tree.elems, localEnv, elemtype);
3109 owntype = new ArrayType(elemtype, syms.arrayClass);
3110 }
3111 if (!types.isReifiable(elemtype))
3112 log.error(tree.pos(), Errors.GenericArrayCreation);
3113 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3114 }
3115
3116 /*
3117 * A lambda expression can only be attributed when a target-type is available.
3118 * In addition, if the target-type is that of a functional interface whose
3119 * descriptor contains inference variables in argument position the lambda expression
3120 * is 'stuck' (see DeferredAttr).
3121 */
3122 @Override
3123 public void visitLambda(final JCLambda that) {
3124 boolean wrongContext = false;
3125 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3126 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3127 //lambda only allowed in assignment or method invocation/cast context
3128 log.error(that.pos(), Errors.UnexpectedLambda);
3129 }
3130 resultInfo = recoveryInfo;
3131 wrongContext = true;
3132 }
3133 //create an environment for attribution of the lambda expression
3134 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3135 boolean needsRecovery =
3136 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3137 try {
3138 if (needsRecovery && rs.isSerializable(pt())) {
3139 localEnv.info.isSerializable = true;
3140 localEnv.info.isSerializableLambda = true;
3141 }
3142 List<Type> explicitParamTypes = null;
3143 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3144 //attribute lambda parameters
3145 attribStats(that.params, localEnv);
3146 explicitParamTypes = TreeInfo.types(that.params);
3147 }
3148
3149 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3150 Type currentTarget = targetInfo.target;
3151 Type lambdaType = targetInfo.descriptor;
3152
3153 if (currentTarget.isErroneous()) {
3154 result = that.type = currentTarget;
3155 return;
3156 }
3157
3158 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3159
3160 if (lambdaType.hasTag(FORALL)) {
3161 //lambda expression target desc cannot be a generic method
3162 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3163 kindName(currentTarget.tsym),
3164 currentTarget.tsym);
3165 resultInfo.checkContext.report(that, diags.fragment(msg));
3166 result = that.type = types.createErrorType(pt());
3167 return;
3168 }
3169
3170 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3171 //add param type info in the AST
3172 List<Type> actuals = lambdaType.getParameterTypes();
3173 List<JCVariableDecl> params = that.params;
3174
3175 boolean arityMismatch = false;
3176
3177 while (params.nonEmpty()) {
3178 if (actuals.isEmpty()) {
3179 //not enough actuals to perform lambda parameter inference
3180 arityMismatch = true;
3181 }
3182 //reset previously set info
3183 Type argType = arityMismatch ?
3184 syms.errType :
3185 actuals.head;
3186 if (params.head.isImplicitlyTyped()) {
3187 setSyntheticVariableType(params.head, argType);
3188 }
3189 params.head.sym = null;
3190 actuals = actuals.isEmpty() ?
3191 actuals :
3192 actuals.tail;
3193 params = params.tail;
3194 }
3195
3196 //attribute lambda parameters
3197 attribStats(that.params, localEnv);
3198
3199 if (arityMismatch) {
3200 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3201 result = that.type = types.createErrorType(currentTarget);
3202 return;
3203 }
3204 }
3205
3206 //from this point on, no recovery is needed; if we are in assignment context
3207 //we will be able to attribute the whole lambda body, regardless of errors;
3208 //if we are in a 'check' method context, and the lambda is not compatible
3209 //with the target-type, it will be recovered anyway in Attr.checkId
3210 needsRecovery = false;
3211
3212 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3213 lambdaBodyResult(that, lambdaType, resultInfo);
3214
3215 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3216 attribTree(that.getBody(), localEnv, bodyResultInfo);
3217 } else {
3218 JCBlock body = (JCBlock)that.body;
3219 if (body == breakTree &&
3220 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3221 breakTreeFound(copyEnv(localEnv));
3222 }
3223 attribStats(body.stats, localEnv);
3224 }
3225
3226 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3227
3228 boolean isSpeculativeRound =
3229 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3230
3231 preFlow(that);
3232 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3233
3234 that.type = currentTarget; //avoids recovery at this stage
3235 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3236
3237 if (!isSpeculativeRound) {
3238 //add thrown types as bounds to the thrown types free variables if needed:
3239 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3240 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3241 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3242 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3243 }
3244 }
3245
3246 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3247 }
3248 result = wrongContext ? that.type = types.createErrorType(pt())
3249 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3250 } catch (Types.FunctionDescriptorLookupError ex) {
3251 JCDiagnostic cause = ex.getDiagnostic();
3252 resultInfo.checkContext.report(that, cause);
3253 result = that.type = types.createErrorType(pt());
3254 return;
3255 } catch (CompletionFailure cf) {
3256 chk.completionError(that.pos(), cf);
3257 } catch (Throwable t) {
3258 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3259 //as that would likely cause the same exception again.
3260 needsRecovery = false;
3261 throw t;
3262 } finally {
3263 localEnv.info.scope.leave();
3264 if (needsRecovery) {
3265 Type prevResult = result;
3266 try {
3267 attribTree(that, env, recoveryInfo);
3268 } finally {
3269 if (result == Type.recoveryType) {
3270 result = prevResult;
3271 }
3272 }
3273 }
3274 }
3275 }
3276 //where
3277 class TargetInfo {
3278 Type target;
3279 Type descriptor;
3280
3281 public TargetInfo(Type target, Type descriptor) {
3282 this.target = target;
3283 this.descriptor = descriptor;
3284 }
3285 }
3286
3287 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3288 Type lambdaType;
3289 Type currentTarget = resultInfo.pt;
3290 if (resultInfo.pt != Type.recoveryType) {
3291 /* We need to adjust the target. If the target is an
3292 * intersection type, for example: SAM & I1 & I2 ...
3293 * the target will be updated to SAM
3294 */
3295 currentTarget = targetChecker.visit(currentTarget, that);
3296 if (!currentTarget.isIntersection()) {
3297 if (explicitParamTypes != null) {
3298 currentTarget = infer.instantiateFunctionalInterface(that,
3299 currentTarget, explicitParamTypes, resultInfo.checkContext);
3300 }
3301 currentTarget = types.removeWildcards(currentTarget);
3302 lambdaType = types.findDescriptorType(currentTarget);
3303 } else {
3304 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3305 ListBuffer<Type> components = new ListBuffer<>();
3306 for (Type bound : ict.getExplicitComponents()) {
3307 if (explicitParamTypes != null) {
3308 try {
3309 bound = infer.instantiateFunctionalInterface(that,
3310 bound, explicitParamTypes, resultInfo.checkContext);
3311 } catch (FunctionDescriptorLookupError t) {
3312 // do nothing
3313 }
3314 }
3315 bound = types.removeWildcards(bound);
3316 components.add(bound);
3317 }
3318 currentTarget = types.makeIntersectionType(components.toList());
3319 currentTarget.tsym.flags_field |= INTERFACE;
3320 lambdaType = types.findDescriptorType(currentTarget);
3321 }
3322
3323 } else {
3324 currentTarget = Type.recoveryType;
3325 lambdaType = fallbackDescriptorType(that);
3326 }
3327 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3328 //lambda expression target desc cannot be a generic method
3329 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3330 kindName(currentTarget.tsym),
3331 currentTarget.tsym);
3332 resultInfo.checkContext.report(that, diags.fragment(msg));
3333 currentTarget = types.createErrorType(pt());
3334 }
3335 return new TargetInfo(currentTarget, lambdaType);
3336 }
3337
3338 void preFlow(JCLambda tree) {
3339 attrRecover.doRecovery();
3340 new PostAttrAnalyzer() {
3341 @Override
3342 public void scan(JCTree tree) {
3343 if (tree == null ||
3344 (tree.type != null &&
3345 tree.type == Type.stuckType)) {
3346 //don't touch stuck expressions!
3347 return;
3348 }
3349 super.scan(tree);
3350 }
3351
3352 @Override
3353 public void visitClassDef(JCClassDecl that) {
3354 // or class declaration trees!
3355 }
3356
3357 public void visitLambda(JCLambda that) {
3358 // or lambda expressions!
3359 }
3360 }.scan(tree.body);
3361 }
3362
3363 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3364
3365 @Override
3366 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3367 return t.isIntersection() ?
3368 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3369 }
3370
3371 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3372 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3373 return ict;
3374 }
3375
3376 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3377 ListBuffer<Type> targs = new ListBuffer<>();
3378 ListBuffer<Type> supertypes = new ListBuffer<>();
3379 for (Type i : ict.interfaces_field) {
3380 if (i.isParameterized()) {
3381 targs.appendList(i.tsym.type.allparams());
3382 }
3383 supertypes.append(i.tsym.type);
3384 }
3385 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3386 notionalIntf.allparams_field = targs.toList();
3387 notionalIntf.tsym.flags_field |= INTERFACE;
3388 return notionalIntf.tsym;
3389 }
3390 };
3391
3392 private Type fallbackDescriptorType(JCExpression tree) {
3393 switch (tree.getTag()) {
3394 case LAMBDA:
3395 JCLambda lambda = (JCLambda)tree;
3396 List<Type> argtypes = List.nil();
3397 for (JCVariableDecl param : lambda.params) {
3398 argtypes = param.vartype != null && param.vartype.type != null ?
3399 argtypes.append(param.vartype.type) :
3400 argtypes.append(syms.errType);
3401 }
3402 return new MethodType(argtypes, Type.recoveryType,
3403 List.of(syms.throwableType), syms.methodClass);
3404 case REFERENCE:
3405 return new MethodType(List.nil(), Type.recoveryType,
3406 List.of(syms.throwableType), syms.methodClass);
3407 default:
3408 Assert.error("Cannot get here!");
3409 }
3410 return null;
3411 }
3412
3413 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3414 final InferenceContext inferenceContext, final Type... ts) {
3415 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3416 }
3417
3418 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3419 final InferenceContext inferenceContext, final List<Type> ts) {
3420 if (inferenceContext.free(ts)) {
3421 inferenceContext.addFreeTypeListener(ts,
3422 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3423 } else {
3424 for (Type t : ts) {
3425 rs.checkAccessibleType(env, t);
3426 }
3427 }
3428 }
3429
3430 /**
3431 * Lambda/method reference have a special check context that ensures
3432 * that i.e. a lambda return type is compatible with the expected
3433 * type according to both the inherited context and the assignment
3434 * context.
3435 */
3436 class FunctionalReturnContext extends Check.NestedCheckContext {
3437
3438 FunctionalReturnContext(CheckContext enclosingContext) {
3439 super(enclosingContext);
3440 }
3441
3442 @Override
3443 public boolean compatible(Type found, Type req, Warner warn) {
3444 //return type must be compatible in both current context and assignment context
3445 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3446 }
3447
3448 @Override
3449 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3450 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3451 }
3452 }
3453
3454 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3455
3456 JCExpression expr;
3457 boolean expStmtExpected;
3458
3459 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3460 super(enclosingContext);
3461 this.expr = expr;
3462 }
3463
3464 @Override
3465 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3466 if (expStmtExpected) {
3467 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3468 } else {
3469 super.report(pos, details);
3470 }
3471 }
3472
3473 @Override
3474 public boolean compatible(Type found, Type req, Warner warn) {
3475 //a void return is compatible with an expression statement lambda
3476 if (req.hasTag(VOID)) {
3477 expStmtExpected = true;
3478 return TreeInfo.isExpressionStatement(expr);
3479 } else {
3480 return super.compatible(found, req, warn);
3481 }
3482 }
3483 }
3484
3485 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3486 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3487 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3488 new FunctionalReturnContext(resultInfo.checkContext);
3489
3490 return descriptor.getReturnType() == Type.recoveryType ?
3491 recoveryInfo :
3492 new ResultInfo(KindSelector.VAL,
3493 descriptor.getReturnType(), funcContext);
3494 }
3495
3496 /**
3497 * Lambda compatibility. Check that given return types, thrown types, parameter types
3498 * are compatible with the expected functional interface descriptor. This means that:
3499 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3500 * types must be compatible with the return type of the expected descriptor.
3501 */
3502 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3503 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3504
3505 //return values have already been checked - but if lambda has no return
3506 //values, we must ensure that void/value compatibility is correct;
3507 //this amounts at checking that, if a lambda body can complete normally,
3508 //the descriptor's return type must be void
3509 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3510 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3511 Fragment msg =
3512 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3513 checkContext.report(tree,
3514 diags.fragment(msg));
3515 }
3516
3517 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3518 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3519 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3520 }
3521 }
3522
3523 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3524 * static field and that lambda has type annotations, these annotations will
3525 * also be stored at these fake clinit methods.
3526 *
3527 * LambdaToMethod also use fake clinit methods so they can be reused.
3528 * Also as LTM is a phase subsequent to attribution, the methods from
3529 * clinits can be safely removed by LTM to save memory.
3530 */
3531 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3532
3533 public MethodSymbol removeClinit(ClassSymbol sym) {
3534 return clinits.remove(sym);
3535 }
3536
3537 /* This method returns an environment to be used to attribute a lambda
3538 * expression.
3539 *
3540 * The owner of this environment is a method symbol. If the current owner
3541 * is not a method, for example if the lambda is used to initialize
3542 * a field, then if the field is:
3543 *
3544 * - an instance field, we use the first constructor.
3545 * - a static field, we create a fake clinit method.
3546 */
3547 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3548 Env<AttrContext> lambdaEnv;
3549 Symbol owner = env.info.scope.owner;
3550 if (owner.kind == VAR && owner.owner.kind == TYP) {
3551 //field initializer
3552 ClassSymbol enclClass = owner.enclClass();
3553 Symbol newScopeOwner = env.info.scope.owner;
3554 /* if the field isn't static, then we can get the first constructor
3555 * and use it as the owner of the environment. This is what
3556 * LTM code is doing to look for type annotations so we are fine.
3557 */
3558 if ((owner.flags() & STATIC) == 0) {
3559 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3560 newScopeOwner = s;
3561 break;
3562 }
3563 } else {
3564 /* if the field is static then we need to create a fake clinit
3565 * method, this method can later be reused by LTM.
3566 */
3567 MethodSymbol clinit = clinits.get(enclClass);
3568 if (clinit == null) {
3569 Type clinitType = new MethodType(List.nil(),
3570 syms.voidType, List.nil(), syms.methodClass);
3571 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3572 names.clinit, clinitType, enclClass);
3573 clinit.params = List.nil();
3574 clinits.put(enclClass, clinit);
3575 }
3576 newScopeOwner = clinit;
3577 }
3578 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3579 } else {
3580 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3581 }
3582 lambdaEnv.info.yieldResult = null;
3583 lambdaEnv.info.isLambda = true;
3584 return lambdaEnv;
3585 }
3586
3587 @Override
3588 public void visitReference(final JCMemberReference that) {
3589 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3590 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3591 //method reference only allowed in assignment or method invocation/cast context
3592 log.error(that.pos(), Errors.UnexpectedMref);
3593 }
3594 result = that.type = types.createErrorType(pt());
3595 return;
3596 }
3597 final Env<AttrContext> localEnv = env.dup(that);
3598 try {
3599 //attribute member reference qualifier - if this is a constructor
3600 //reference, the expected kind must be a type
3601 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3602
3603 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3604 exprType = chk.checkConstructorRefType(that.expr, exprType);
3605 if (!exprType.isErroneous() &&
3606 exprType.isRaw() &&
3607 that.typeargs != null) {
3608 log.error(that.expr.pos(),
3609 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3610 Fragments.MrefInferAndExplicitParams));
3611 exprType = types.createErrorType(exprType);
3612 }
3613 }
3614
3615 if (exprType.isErroneous()) {
3616 //if the qualifier expression contains problems,
3617 //give up attribution of method reference
3618 result = that.type = exprType;
3619 return;
3620 }
3621
3622 if (TreeInfo.isStaticSelector(that.expr, names)) {
3623 //if the qualifier is a type, validate it; raw warning check is
3624 //omitted as we don't know at this stage as to whether this is a
3625 //raw selector (because of inference)
3626 chk.validate(that.expr, env, false);
3627 } else {
3628 Symbol lhsSym = TreeInfo.symbol(that.expr);
3629 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3630 }
3631 //attrib type-arguments
3632 List<Type> typeargtypes = List.nil();
3633 if (that.typeargs != null) {
3634 typeargtypes = attribTypes(that.typeargs, localEnv);
3635 }
3636
3637 boolean isTargetSerializable =
3638 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3639 rs.isSerializable(pt());
3640 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3641 Type currentTarget = targetInfo.target;
3642 Type desc = targetInfo.descriptor;
3643
3644 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3645 List<Type> argtypes = desc.getParameterTypes();
3646 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3647
3648 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3649 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3650 }
3651
3652 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3653 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3654 try {
3655 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3656 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3657 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3658 } finally {
3659 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3660 }
3661
3662 Symbol refSym = refResult.fst;
3663 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3664
3665 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3666 * JDK-8075541
3667 */
3668 if (refSym.kind != MTH) {
3669 boolean targetError;
3670 switch (refSym.kind) {
3671 case ABSENT_MTH:
3672 case MISSING_ENCL:
3673 targetError = false;
3674 break;
3675 case WRONG_MTH:
3676 case WRONG_MTHS:
3677 case AMBIGUOUS:
3678 case HIDDEN:
3679 case STATICERR:
3680 targetError = true;
3681 break;
3682 default:
3683 Assert.error("unexpected result kind " + refSym.kind);
3684 targetError = false;
3685 }
3686
3687 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3688 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3689 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3690
3691 JCDiagnostic diag = diags.create(log.currentSource(), that,
3692 targetError ?
3693 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3694 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3695
3696 if (targetError && currentTarget == Type.recoveryType) {
3697 //a target error doesn't make sense during recovery stage
3698 //as we don't know what actual parameter types are
3699 result = that.type = currentTarget;
3700 return;
3701 } else {
3702 if (targetError) {
3703 resultInfo.checkContext.report(that, diag);
3704 } else {
3705 log.report(diag);
3706 }
3707 result = that.type = types.createErrorType(currentTarget);
3708 return;
3709 }
3710 }
3711
3712 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3713 that.kind = lookupHelper.referenceKind(that.sym);
3714 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3715
3716 if (desc.getReturnType() == Type.recoveryType) {
3717 // stop here
3718 result = that.type = currentTarget;
3719 return;
3720 }
3721
3722 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3723 Type enclosingType = exprType.getEnclosingType();
3724 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3725 // Check for the existence of an appropriate outer instance
3726 rs.resolveImplicitThis(that.pos(), env, exprType);
3727 }
3728 }
3729
3730 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3731
3732 if (that.getMode() == ReferenceMode.INVOKE &&
3733 TreeInfo.isStaticSelector(that.expr, names) &&
3734 that.kind.isUnbound() &&
3735 lookupHelper.site.isRaw()) {
3736 chk.checkRaw(that.expr, localEnv);
3737 }
3738
3739 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3740 exprType.getTypeArguments().nonEmpty()) {
3741 //static ref with class type-args
3742 log.error(that.expr.pos(),
3743 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3744 Fragments.StaticMrefWithTargs));
3745 result = that.type = types.createErrorType(currentTarget);
3746 return;
3747 }
3748
3749 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3750 // Check that super-qualified symbols are not abstract (JLS)
3751 rs.checkNonAbstract(that.pos(), that.sym);
3752 }
3753
3754 if (isTargetSerializable) {
3755 chk.checkAccessFromSerializableElement(that, true);
3756 }
3757 }
3758
3759 ResultInfo checkInfo =
3760 resultInfo.dup(newMethodTemplate(
3761 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3762 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3763 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3764
3765 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3766
3767 if (that.kind.isUnbound() &&
3768 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3769 //re-generate inference constraints for unbound receiver
3770 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3771 //cannot happen as this has already been checked - we just need
3772 //to regenerate the inference constraints, as that has been lost
3773 //as a result of the call to inferenceContext.save()
3774 Assert.error("Can't get here");
3775 }
3776 }
3777
3778 if (!refType.isErroneous()) {
3779 refType = types.createMethodTypeWithReturn(refType,
3780 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3781 }
3782
3783 //go ahead with standard method reference compatibility check - note that param check
3784 //is a no-op (as this has been taken care during method applicability)
3785 boolean isSpeculativeRound =
3786 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3787
3788 that.type = currentTarget; //avoids recovery at this stage
3789 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3790 if (!isSpeculativeRound) {
3791 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3792 }
3793 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3794 } catch (Types.FunctionDescriptorLookupError ex) {
3795 JCDiagnostic cause = ex.getDiagnostic();
3796 resultInfo.checkContext.report(that, cause);
3797 result = that.type = types.createErrorType(pt());
3798 return;
3799 }
3800 }
3801 //where
3802 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3803 //if this is a constructor reference, the expected kind must be a type
3804 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3805 KindSelector.VAL_TYP : KindSelector.TYP,
3806 Type.noType);
3807 }
3808
3809
3810 @SuppressWarnings("fallthrough")
3811 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3812 InferenceContext inferenceContext = checkContext.inferenceContext();
3813 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3814
3815 Type resType;
3816 switch (tree.getMode()) {
3817 case NEW:
3818 if (!tree.expr.type.isRaw()) {
3819 resType = tree.expr.type;
3820 break;
3821 }
3822 default:
3823 resType = refType.getReturnType();
3824 }
3825
3826 Type incompatibleReturnType = resType;
3827
3828 if (returnType.hasTag(VOID)) {
3829 incompatibleReturnType = null;
3830 }
3831
3832 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3833 if (resType.isErroneous() ||
3834 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3835 checkContext.checkWarner(tree, resType, returnType))) {
3836 incompatibleReturnType = null;
3837 }
3838 }
3839
3840 if (incompatibleReturnType != null) {
3841 Fragment msg =
3842 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3843 checkContext.report(tree, diags.fragment(msg));
3844 } else {
3845 if (inferenceContext.free(refType)) {
3846 // we need to wait for inference to finish and then replace inference vars in the referent type
3847 inferenceContext.addFreeTypeListener(List.of(refType),
3848 instantiatedContext -> {
3849 tree.referentType = instantiatedContext.asInstType(refType);
3850 });
3851 } else {
3852 tree.referentType = refType;
3853 }
3854 }
3855
3856 if (!speculativeAttr) {
3857 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3858 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3859 }
3860 }
3861 }
3862
3863 boolean checkExConstraints(
3864 List<Type> thrownByFuncExpr,
3865 List<Type> thrownAtFuncType,
3866 InferenceContext inferenceContext) {
3867 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3868 * are not proper types
3869 */
3870 List<Type> nonProperList = thrownAtFuncType.stream()
3871 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3872 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3873
3874 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3875 * in the throws clause of the invocation type of the method reference's compile-time
3876 * declaration
3877 */
3878 List<Type> checkedList = thrownByFuncExpr.stream()
3879 .filter(e -> chk.isChecked(e)).collect(List.collector());
3880
3881 /** If n = 0 (the function type's throws clause consists only of proper types), then
3882 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3883 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3884 * reduces to true
3885 */
3886 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3887 for (Type checked : checkedList) {
3888 boolean isSubtype = false;
3889 for (Type proper : properList) {
3890 if (types.isSubtype(checked, proper)) {
3891 isSubtype = true;
3892 break;
3893 }
3894 }
3895 if (!isSubtype) {
3896 uncaughtByProperTypes.add(checked);
3897 }
3898 }
3899
3900 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3901 return false;
3902 }
3903
3904 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3905 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3906 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3907 */
3908 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3909 uncaughtByProperTypes.forEach(checkedEx -> {
3910 nonProperAsUndet.forEach(nonProper -> {
3911 types.isSubtype(checkedEx, nonProper);
3912 });
3913 });
3914
3915 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3916 */
3917 nonProperAsUndet.stream()
3918 .filter(t -> t.hasTag(UNDETVAR))
3919 .forEach(t -> ((UndetVar)t).setThrow());
3920 return true;
3921 }
3922
3923 /**
3924 * Set functional type info on the underlying AST. Note: as the target descriptor
3925 * might contain inference variables, we might need to register an hook in the
3926 * current inference context.
3927 */
3928 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3929 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3930 if (checkContext.inferenceContext().free(descriptorType)) {
3931 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3932 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3933 inferenceContext.asInstType(primaryTarget), checkContext));
3934 } else {
3935 if (pt.hasTag(CLASS)) {
3936 fExpr.target = primaryTarget;
3937 }
3938 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3939 pt != Type.recoveryType) {
3940 //check that functional interface class is well-formed
3941 try {
3942 /* Types.makeFunctionalInterfaceClass() may throw an exception
3943 * when it's executed post-inference. See the listener code
3944 * above.
3945 */
3946 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3947 names.empty, fExpr.target, ABSTRACT);
3948 if (csym != null) {
3949 chk.checkImplementations(env.tree, csym, csym);
3950 try {
3951 //perform an additional functional interface check on the synthetic class,
3952 //as there may be spurious errors for raw targets - because of existing issues
3953 //with membership and inheritance (see JDK-8074570).
3954 csym.flags_field |= INTERFACE;
3955 types.findDescriptorType(csym.type);
3956 } catch (FunctionDescriptorLookupError err) {
3957 resultInfo.checkContext.report(fExpr,
3958 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3959 }
3960 }
3961 } catch (Types.FunctionDescriptorLookupError ex) {
3962 JCDiagnostic cause = ex.getDiagnostic();
3963 resultInfo.checkContext.report(env.tree, cause);
3964 }
3965 }
3966 }
3967 }
3968
3969 public void visitParens(JCParens tree) {
3970 Type owntype = attribTree(tree.expr, env, resultInfo);
3971 result = check(tree, owntype, pkind(), resultInfo);
3972 Symbol sym = TreeInfo.symbol(tree);
3973 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3974 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3975 }
3976
3977 public void visitAssign(JCAssign tree) {
3978 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3979 Type capturedType = capture(owntype);
3980 attribExpr(tree.rhs, env, owntype);
3981 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3982 }
3983
3984 public void visitAssignop(JCAssignOp tree) {
3985 // Attribute arguments.
3986 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3987 Type operand = attribExpr(tree.rhs, env);
3988 // Find operator.
3989 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3990 if (operator != operators.noOpSymbol &&
3991 !owntype.isErroneous() &&
3992 !operand.isErroneous()) {
3993 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3994 chk.checkCastable(tree.rhs.pos(),
3995 operator.type.getReturnType(),
3996 owntype);
3997 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
3998 }
3999 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4000 }
4001
4002 public void visitUnary(JCUnary tree) {
4003 // Attribute arguments.
4004 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4005 ? attribTree(tree.arg, env, varAssignmentInfo)
4006 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4007
4008 // Find operator.
4009 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4010 Type owntype = types.createErrorType(tree.type);
4011 if (operator != operators.noOpSymbol &&
4012 !argtype.isErroneous()) {
4013 owntype = (tree.getTag().isIncOrDecUnaryOp())
4014 ? tree.arg.type
4015 : operator.type.getReturnType();
4016 int opc = operator.opcode;
4017
4018 // If the argument is constant, fold it.
4019 if (argtype.constValue() != null) {
4020 Type ctype = cfolder.fold1(opc, argtype);
4021 if (ctype != null) {
4022 owntype = cfolder.coerce(ctype, owntype);
4023 }
4024 }
4025 }
4026 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4027 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4028 }
4029
4030 public void visitBinary(JCBinary tree) {
4031 // Attribute arguments.
4032 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4033 // x && y
4034 // include x's bindings when true in y
4035
4036 // x || y
4037 // include x's bindings when false in y
4038
4039 MatchBindings lhsBindings = matchBindings;
4040 List<BindingSymbol> propagatedBindings;
4041 switch (tree.getTag()) {
4042 case AND:
4043 propagatedBindings = lhsBindings.bindingsWhenTrue;
4044 break;
4045 case OR:
4046 propagatedBindings = lhsBindings.bindingsWhenFalse;
4047 break;
4048 default:
4049 propagatedBindings = List.nil();
4050 break;
4051 }
4052 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4053 Type right;
4054 try {
4055 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4056 } finally {
4057 rhsEnv.info.scope.leave();
4058 }
4059
4060 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4061
4062 // Find operator.
4063 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4064 Type owntype = types.createErrorType(tree.type);
4065 if (operator != operators.noOpSymbol &&
4066 !left.isErroneous() &&
4067 !right.isErroneous()) {
4068 owntype = operator.type.getReturnType();
4069 int opc = operator.opcode;
4070 // If both arguments are constants, fold them.
4071 if (left.constValue() != null && right.constValue() != null) {
4072 Type ctype = cfolder.fold2(opc, left, right);
4073 if (ctype != null) {
4074 owntype = cfolder.coerce(ctype, owntype);
4075 }
4076 }
4077
4078 // Check that argument types of a reference ==, != are
4079 // castable to each other, (JLS 15.21). Note: unboxing
4080 // comparisons will not have an acmp* opc at this point.
4081 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4082 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4083 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4084 }
4085 }
4086
4087 chk.checkDivZero(tree.rhs.pos(), operator, right);
4088 }
4089 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4090 }
4091
4092 public void visitTypeCast(final JCTypeCast tree) {
4093 Type clazztype = attribType(tree.clazz, env);
4094 chk.validate(tree.clazz, env, false);
4095 //a fresh environment is required for 292 inference to work properly ---
4096 //see Infer.instantiatePolymorphicSignatureInstance()
4097 Env<AttrContext> localEnv = env.dup(tree);
4098 //should we propagate the target type?
4099 final ResultInfo castInfo;
4100 JCExpression expr = TreeInfo.skipParens(tree.expr);
4101 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4102 if (isPoly) {
4103 //expression is a poly - we need to propagate target type info
4104 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4105 new Check.NestedCheckContext(resultInfo.checkContext) {
4106 @Override
4107 public boolean compatible(Type found, Type req, Warner warn) {
4108 return types.isCastable(found, req, warn);
4109 }
4110 });
4111 } else {
4112 //standalone cast - target-type info is not propagated
4113 castInfo = unknownExprInfo;
4114 }
4115 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4116 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4117 if (exprtype.constValue() != null)
4118 owntype = cfolder.coerce(exprtype, owntype);
4119 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4120 if (!isPoly)
4121 chk.checkRedundantCast(localEnv, tree);
4122 }
4123
4124 public void visitTypeTest(JCInstanceOf tree) {
4125 Type exprtype = chk.checkNullOrRefType(
4126 tree.expr.pos(), attribExpr(tree.expr, env));
4127 Type clazztype;
4128 JCTree typeTree;
4129 if (tree.pattern.getTag() == BINDINGPATTERN ||
4130 tree.pattern.getTag() == RECORDPATTERN) {
4131 attribExpr(tree.pattern, env, exprtype);
4132 clazztype = tree.pattern.type;
4133 if (types.isSubtype(exprtype, clazztype) &&
4134 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4135 tree.pattern.getTag() != RECORDPATTERN) {
4136 if (!allowUnconditionalPatternsInstanceOf) {
4137 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4138 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4139 }
4140 }
4141 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4142 } else {
4143 clazztype = attribType(tree.pattern, env);
4144 typeTree = tree.pattern;
4145 chk.validate(typeTree, env, false);
4146 }
4147 if (!clazztype.hasTag(TYPEVAR)) {
4148 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4149 }
4150 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4151 boolean valid = false;
4152 if (allowReifiableTypesInInstanceof) {
4153 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4154 } else {
4155 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4156 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4157 allowReifiableTypesInInstanceof = true;
4158 }
4159 if (!valid) {
4160 clazztype = types.createErrorType(clazztype);
4161 }
4162 }
4163 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4164 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4165 }
4166
4167 private boolean checkCastablePattern(DiagnosticPosition pos,
4168 Type exprType,
4169 Type pattType) {
4170 Warner warner = new Warner();
4171 // if any type is erroneous, the problem is reported elsewhere
4172 if (exprType.isErroneous() || pattType.isErroneous()) {
4173 return false;
4174 }
4175 if (!types.isCastable(exprType, pattType, warner)) {
4176 chk.basicHandler.report(pos,
4177 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4178 return false;
4179 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4180 (!exprType.isPrimitive() ||
4181 !pattType.isPrimitive() ||
4182 !types.isSameType(exprType, pattType))) {
4183 chk.basicHandler.report(pos,
4184 diags.fragment(Fragments.NotApplicableTypes(exprType, pattType)));
4185 return false;
4186 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4187 log.error(pos,
4188 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4189 return false;
4190 } else {
4191 return true;
4192 }
4193 }
4194
4195 @Override
4196 public void visitAnyPattern(JCAnyPattern tree) {
4197 result = tree.type = resultInfo.pt;
4198 }
4199
4200 public void visitBindingPattern(JCBindingPattern tree) {
4201 Type type;
4202 if (tree.var.vartype != null) {
4203 type = attribType(tree.var.vartype, env);
4204 } else {
4205 type = resultInfo.pt;
4206 }
4207 tree.type = tree.var.type = type;
4208 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4209 v.pos = tree.pos;
4210 tree.var.sym = v;
4211 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4212 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4213 }
4214 if (tree.var.vartype != null) {
4215 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4216 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4217 annotate.flush();
4218 }
4219 chk.validate(tree.var.vartype, env, true);
4220 result = tree.type;
4221 if (v.isUnnamedVariable()) {
4222 matchBindings = MatchBindingsComputer.EMPTY;
4223 } else {
4224 matchBindings = new MatchBindings(List.of(v), List.nil());
4225 }
4226 }
4227
4228 @Override
4229 public void visitRecordPattern(JCRecordPattern tree) {
4230 Type site;
4231
4232 if (tree.deconstructor == null) {
4233 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4234 tree.record = syms.errSymbol;
4235 site = tree.type = types.createErrorType(tree.record.type);
4236 } else {
4237 Type type = attribType(tree.deconstructor, env);
4238 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4239 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4240 if (inferred == null) {
4241 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4242 } else {
4243 type = inferred;
4244 }
4245 }
4246 tree.type = tree.deconstructor.type = type;
4247 site = types.capture(tree.type);
4248 }
4249
4250 List<Type> expectedRecordTypes;
4251 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4252 ClassSymbol record = (ClassSymbol) site.tsym;
4253 expectedRecordTypes = record.getRecordComponents()
4254 .stream()
4255 .map(rc -> types.memberType(site, rc))
4256 .map(t -> types.upward(t, types.captures(t)).baseType())
4257 .collect(List.collector());
4258 tree.record = record;
4259 } else {
4260 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4261 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4262 .limit(tree.nested.size())
4263 .collect(List.collector());
4264 tree.record = syms.errSymbol;
4265 }
4266 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4267 List<Type> recordTypes = expectedRecordTypes;
4268 List<JCPattern> nestedPatterns = tree.nested;
4269 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4270 try {
4271 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4272 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4273 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4274 outBindings.addAll(matchBindings.bindingsWhenTrue);
4275 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4276 nestedPatterns = nestedPatterns.tail;
4277 recordTypes = recordTypes.tail;
4278 }
4279 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4280 while (nestedPatterns.nonEmpty()) {
4281 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4282 nestedPatterns = nestedPatterns.tail;
4283 }
4284 List<Type> nestedTypes =
4285 tree.nested.stream().map(p -> p.type).collect(List.collector());
4286 log.error(tree.pos(),
4287 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4288 nestedTypes));
4289 }
4290 } finally {
4291 localEnv.info.scope.leave();
4292 }
4293 chk.validate(tree.deconstructor, env, true);
4294 result = tree.type;
4295 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4296 }
4297
4298 public void visitIndexed(JCArrayAccess tree) {
4299 Type owntype = types.createErrorType(tree.type);
4300 Type atype = attribExpr(tree.indexed, env);
4301 attribExpr(tree.index, env, syms.intType);
4302 if (types.isArray(atype))
4303 owntype = types.elemtype(atype);
4304 else if (!atype.hasTag(ERROR))
4305 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4306 if (!pkind().contains(KindSelector.VAL))
4307 owntype = capture(owntype);
4308 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4309 }
4310
4311 public void visitIdent(JCIdent tree) {
4312 Symbol sym;
4313
4314 // Find symbol
4315 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4316 // If we are looking for a method, the prototype `pt' will be a
4317 // method type with the type of the call's arguments as parameters.
4318 env.info.pendingResolutionPhase = null;
4319 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4320 } else if (tree.sym != null && tree.sym.kind != VAR) {
4321 sym = tree.sym;
4322 } else {
4323 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4324 }
4325 tree.sym = sym;
4326
4327 // Also find the environment current for the class where
4328 // sym is defined (`symEnv').
4329 Env<AttrContext> symEnv = env;
4330 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4331 sym.kind.matches(KindSelector.VAL_MTH) &&
4332 sym.owner.kind == TYP &&
4333 tree.name != names._this && tree.name != names._super) {
4334
4335 // Find environment in which identifier is defined.
4336 while (symEnv.outer != null &&
4337 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4338 symEnv = symEnv.outer;
4339 }
4340 }
4341
4342 // If symbol is a variable, ...
4343 if (sym.kind == VAR) {
4344 VarSymbol v = (VarSymbol)sym;
4345
4346 // ..., evaluate its initializer, if it has one, and check for
4347 // illegal forward reference.
4348 checkInit(tree, env, v, false);
4349
4350 // If we are expecting a variable (as opposed to a value), check
4351 // that the variable is assignable in the current environment.
4352 if (KindSelector.ASG.subset(pkind()))
4353 checkAssignable(tree.pos(), v, null, env);
4354 }
4355
4356 // In a constructor body,
4357 // if symbol is a field or instance method, check that it is
4358 // not accessed before the supertype constructor is called.
4359 if (symEnv.info.isSelfCall &&
4360 sym.kind.matches(KindSelector.VAL_MTH) &&
4361 sym.owner.kind == TYP &&
4362 (sym.flags() & STATIC) == 0) {
4363 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4364 sym : thisSym(tree.pos(), env));
4365 }
4366 Env<AttrContext> env1 = env;
4367 if (sym.kind != ERR && sym.kind != TYP &&
4368 sym.owner != null && sym.owner != env1.enclClass.sym) {
4369 // If the found symbol is inaccessible, then it is
4370 // accessed through an enclosing instance. Locate this
4371 // enclosing instance:
4372 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4373 env1 = env1.outer;
4374 }
4375
4376 if (env.info.isSerializable) {
4377 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4378 }
4379
4380 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4381 }
4382
4383 public void visitSelect(JCFieldAccess tree) {
4384 // Determine the expected kind of the qualifier expression.
4385 KindSelector skind = KindSelector.NIL;
4386 if (tree.name == names._this || tree.name == names._super ||
4387 tree.name == names._class)
4388 {
4389 skind = KindSelector.TYP;
4390 } else {
4391 if (pkind().contains(KindSelector.PCK))
4392 skind = KindSelector.of(skind, KindSelector.PCK);
4393 if (pkind().contains(KindSelector.TYP))
4394 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4395 if (pkind().contains(KindSelector.VAL_MTH))
4396 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4397 }
4398
4399 // Attribute the qualifier expression, and determine its symbol (if any).
4400 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4401 if (!pkind().contains(KindSelector.TYP_PCK))
4402 site = capture(site); // Capture field access
4403
4404 // don't allow T.class T[].class, etc
4405 if (skind == KindSelector.TYP) {
4406 Type elt = site;
4407 while (elt.hasTag(ARRAY))
4408 elt = ((ArrayType)elt).elemtype;
4409 if (elt.hasTag(TYPEVAR)) {
4410 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4411 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4412 tree.sym = tree.type.tsym;
4413 return ;
4414 }
4415 }
4416
4417 // If qualifier symbol is a type or `super', assert `selectSuper'
4418 // for the selection. This is relevant for determining whether
4419 // protected symbols are accessible.
4420 Symbol sitesym = TreeInfo.symbol(tree.selected);
4421 boolean selectSuperPrev = env.info.selectSuper;
4422 env.info.selectSuper =
4423 sitesym != null &&
4424 sitesym.name == names._super;
4425
4426 // Determine the symbol represented by the selection.
4427 env.info.pendingResolutionPhase = null;
4428 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4429 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4430 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4431 sym = syms.errSymbol;
4432 }
4433 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4434 site = capture(site);
4435 sym = selectSym(tree, sitesym, site, env, resultInfo);
4436 }
4437 boolean varArgs = env.info.lastResolveVarargs();
4438 tree.sym = sym;
4439
4440 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4441 site = types.skipTypeVars(site, true);
4442 }
4443
4444 // If that symbol is a variable, ...
4445 if (sym.kind == VAR) {
4446 VarSymbol v = (VarSymbol)sym;
4447
4448 // ..., evaluate its initializer, if it has one, and check for
4449 // illegal forward reference.
4450 checkInit(tree, env, v, true);
4451
4452 // If we are expecting a variable (as opposed to a value), check
4453 // that the variable is assignable in the current environment.
4454 if (KindSelector.ASG.subset(pkind()))
4455 checkAssignable(tree.pos(), v, tree.selected, env);
4456 }
4457
4458 if (sitesym != null &&
4459 sitesym.kind == VAR &&
4460 ((VarSymbol)sitesym).isResourceVariable() &&
4461 sym.kind == MTH &&
4462 sym.name.equals(names.close) &&
4463 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4464 env.info.lint.isEnabled(LintCategory.TRY)) {
4465 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4466 }
4467
4468 // Disallow selecting a type from an expression
4469 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4470 tree.type = check(tree.selected, pt(),
4471 sitesym == null ?
4472 KindSelector.VAL : sitesym.kind.toSelector(),
4473 new ResultInfo(KindSelector.TYP_PCK, pt()));
4474 }
4475
4476 if (isType(sitesym)) {
4477 if (sym.name == names._this || sym.name == names._super) {
4478 // If `C' is the currently compiled class, check that
4479 // `C.this' does not appear in an explicit call to a constructor
4480 // also make sure that `super` is not used in constructor invocations
4481 if (env.info.isSelfCall &&
4482 ((sym.name == names._this &&
4483 site.tsym == env.enclClass.sym) ||
4484 sym.name == names._super && env.info.constructorArgs &&
4485 (sitesym.isInterface() || site.tsym == env.enclClass.sym))) {
4486 chk.earlyRefError(tree.pos(), sym);
4487 }
4488 } else {
4489 // Check if type-qualified fields or methods are static (JLS)
4490 if ((sym.flags() & STATIC) == 0 &&
4491 sym.name != names._super &&
4492 (sym.kind == VAR || sym.kind == MTH)) {
4493 rs.accessBase(rs.new StaticError(sym),
4494 tree.pos(), site, sym.name, true);
4495 }
4496 }
4497 } else if (sym.kind != ERR &&
4498 (sym.flags() & STATIC) != 0 &&
4499 sym.name != names._class) {
4500 // If the qualified item is not a type and the selected item is static, report
4501 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4502 if (!sym.owner.isAnonymous()) {
4503 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4504 } else {
4505 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4506 }
4507 }
4508
4509 // If we are selecting an instance member via a `super', ...
4510 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4511
4512 // Check that super-qualified symbols are not abstract (JLS)
4513 rs.checkNonAbstract(tree.pos(), sym);
4514
4515 if (site.isRaw()) {
4516 // Determine argument types for site.
4517 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4518 if (site1 != null) site = site1;
4519 }
4520 }
4521
4522 if (env.info.isSerializable) {
4523 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4524 }
4525
4526 env.info.selectSuper = selectSuperPrev;
4527 result = checkId(tree, site, sym, env, resultInfo);
4528 }
4529 //where
4530 /** Determine symbol referenced by a Select expression,
4531 *
4532 * @param tree The select tree.
4533 * @param site The type of the selected expression,
4534 * @param env The current environment.
4535 * @param resultInfo The current result.
4536 */
4537 private Symbol selectSym(JCFieldAccess tree,
4538 Symbol location,
4539 Type site,
4540 Env<AttrContext> env,
4541 ResultInfo resultInfo) {
4542 DiagnosticPosition pos = tree.pos();
4543 Name name = tree.name;
4544 switch (site.getTag()) {
4545 case PACKAGE:
4546 return rs.accessBase(
4547 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4548 pos, location, site, name, true);
4549 case ARRAY:
4550 case CLASS:
4551 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4552 return rs.resolveQualifiedMethod(
4553 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4554 } else if (name == names._this || name == names._super) {
4555 return rs.resolveSelf(pos, env, site.tsym, name);
4556 } else if (name == names._class) {
4557 // In this case, we have already made sure in
4558 // visitSelect that qualifier expression is a type.
4559 return syms.getClassField(site, types);
4560 } else {
4561 // We are seeing a plain identifier as selector.
4562 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4563 sym = rs.accessBase(sym, pos, location, site, name, true);
4564 return sym;
4565 }
4566 case WILDCARD:
4567 throw new AssertionError(tree);
4568 case TYPEVAR:
4569 // Normally, site.getUpperBound() shouldn't be null.
4570 // It should only happen during memberEnter/attribBase
4571 // when determining the supertype which *must* be
4572 // done before attributing the type variables. In
4573 // other words, we are seeing this illegal program:
4574 // class B<T> extends A<T.foo> {}
4575 Symbol sym = (site.getUpperBound() != null)
4576 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4577 : null;
4578 if (sym == null) {
4579 log.error(pos, Errors.TypeVarCantBeDeref);
4580 return syms.errSymbol;
4581 } else {
4582 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4583 rs.new AccessError(env, site, sym) :
4584 sym;
4585 rs.accessBase(sym2, pos, location, site, name, true);
4586 return sym;
4587 }
4588 case ERROR:
4589 // preserve identifier names through errors
4590 return types.createErrorType(name, site.tsym, site).tsym;
4591 default:
4592 // The qualifier expression is of a primitive type -- only
4593 // .class is allowed for these.
4594 if (name == names._class) {
4595 // In this case, we have already made sure in Select that
4596 // qualifier expression is a type.
4597 return syms.getClassField(site, types);
4598 } else {
4599 log.error(pos, Errors.CantDeref(site));
4600 return syms.errSymbol;
4601 }
4602 }
4603 }
4604
4605 /** Determine type of identifier or select expression and check that
4606 * (1) the referenced symbol is not deprecated
4607 * (2) the symbol's type is safe (@see checkSafe)
4608 * (3) if symbol is a variable, check that its type and kind are
4609 * compatible with the prototype and protokind.
4610 * (4) if symbol is an instance field of a raw type,
4611 * which is being assigned to, issue an unchecked warning if its
4612 * type changes under erasure.
4613 * (5) if symbol is an instance method of a raw type, issue an
4614 * unchecked warning if its argument types change under erasure.
4615 * If checks succeed:
4616 * If symbol is a constant, return its constant type
4617 * else if symbol is a method, return its result type
4618 * otherwise return its type.
4619 * Otherwise return errType.
4620 *
4621 * @param tree The syntax tree representing the identifier
4622 * @param site If this is a select, the type of the selected
4623 * expression, otherwise the type of the current class.
4624 * @param sym The symbol representing the identifier.
4625 * @param env The current environment.
4626 * @param resultInfo The expected result
4627 */
4628 Type checkId(JCTree tree,
4629 Type site,
4630 Symbol sym,
4631 Env<AttrContext> env,
4632 ResultInfo resultInfo) {
4633 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4634 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4635 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4636 }
4637
4638 Type checkMethodIdInternal(JCTree tree,
4639 Type site,
4640 Symbol sym,
4641 Env<AttrContext> env,
4642 ResultInfo resultInfo) {
4643 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4644 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4645 } else {
4646 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4647 }
4648 }
4649
4650 Type checkIdInternal(JCTree tree,
4651 Type site,
4652 Symbol sym,
4653 Type pt,
4654 Env<AttrContext> env,
4655 ResultInfo resultInfo) {
4656 if (pt.isErroneous()) {
4657 return types.createErrorType(site);
4658 }
4659 Type owntype; // The computed type of this identifier occurrence.
4660 switch (sym.kind) {
4661 case TYP:
4662 // For types, the computed type equals the symbol's type,
4663 // except for two situations:
4664 owntype = sym.type;
4665 if (owntype.hasTag(CLASS)) {
4666 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4667 Type ownOuter = owntype.getEnclosingType();
4668
4669 // (a) If the symbol's type is parameterized, erase it
4670 // because no type parameters were given.
4671 // We recover generic outer type later in visitTypeApply.
4672 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4673 owntype = types.erasure(owntype);
4674 }
4675
4676 // (b) If the symbol's type is an inner class, then
4677 // we have to interpret its outer type as a superclass
4678 // of the site type. Example:
4679 //
4680 // class Tree<A> { class Visitor { ... } }
4681 // class PointTree extends Tree<Point> { ... }
4682 // ...PointTree.Visitor...
4683 //
4684 // Then the type of the last expression above is
4685 // Tree<Point>.Visitor.
4686 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4687 Type normOuter = site;
4688 if (normOuter.hasTag(CLASS)) {
4689 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4690 }
4691 if (normOuter == null) // perhaps from an import
4692 normOuter = types.erasure(ownOuter);
4693 if (normOuter != ownOuter)
4694 owntype = new ClassType(
4695 normOuter, List.nil(), owntype.tsym,
4696 owntype.getMetadata());
4697 }
4698 }
4699 break;
4700 case VAR:
4701 VarSymbol v = (VarSymbol)sym;
4702
4703 if (env.info.enclVar != null
4704 && v.type.hasTag(NONE)) {
4705 //self reference to implicitly typed variable declaration
4706 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4707 return tree.type = v.type = types.createErrorType(v.type);
4708 }
4709
4710 // Test (4): if symbol is an instance field of a raw type,
4711 // which is being assigned to, issue an unchecked warning if
4712 // its type changes under erasure.
4713 if (KindSelector.ASG.subset(pkind()) &&
4714 v.owner.kind == TYP &&
4715 (v.flags() & STATIC) == 0 &&
4716 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4717 Type s = types.asOuterSuper(site, v.owner);
4718 if (s != null &&
4719 s.isRaw() &&
4720 !types.isSameType(v.type, v.erasure(types))) {
4721 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4722 }
4723 }
4724 // The computed type of a variable is the type of the
4725 // variable symbol, taken as a member of the site type.
4726 owntype = (sym.owner.kind == TYP &&
4727 sym.name != names._this && sym.name != names._super)
4728 ? types.memberType(site, sym)
4729 : sym.type;
4730
4731 // If the variable is a constant, record constant value in
4732 // computed type.
4733 if (v.getConstValue() != null && isStaticReference(tree))
4734 owntype = owntype.constType(v.getConstValue());
4735
4736 if (resultInfo.pkind == KindSelector.VAL) {
4737 owntype = capture(owntype); // capture "names as expressions"
4738 }
4739 break;
4740 case MTH: {
4741 owntype = checkMethod(site, sym,
4742 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4743 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4744 resultInfo.pt.getTypeArguments());
4745 break;
4746 }
4747 case PCK: case ERR:
4748 owntype = sym.type;
4749 break;
4750 default:
4751 throw new AssertionError("unexpected kind: " + sym.kind +
4752 " in tree " + tree);
4753 }
4754
4755 // Emit a `deprecation' warning if symbol is deprecated.
4756 // (for constructors (but not for constructor references), the error
4757 // was given when the constructor was resolved)
4758
4759 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4760 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4761 chk.checkSunAPI(tree.pos(), sym);
4762 chk.checkProfile(tree.pos(), sym);
4763 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4764 }
4765
4766 // If symbol is a variable, check that its type and
4767 // kind are compatible with the prototype and protokind.
4768 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4769 }
4770
4771 /** Check that variable is initialized and evaluate the variable's
4772 * initializer, if not yet done. Also check that variable is not
4773 * referenced before it is defined.
4774 * @param tree The tree making up the variable reference.
4775 * @param env The current environment.
4776 * @param v The variable's symbol.
4777 */
4778 private void checkInit(JCTree tree,
4779 Env<AttrContext> env,
4780 VarSymbol v,
4781 boolean onlyWarning) {
4782 // A forward reference is diagnosed if the declaration position
4783 // of the variable is greater than the current tree position
4784 // and the tree and variable definition occur in the same class
4785 // definition. Note that writes don't count as references.
4786 // This check applies only to class and instance
4787 // variables. Local variables follow different scope rules,
4788 // and are subject to definite assignment checking.
4789 Env<AttrContext> initEnv = enclosingInitEnv(env);
4790 if (initEnv != null &&
4791 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4792 v.owner.kind == TYP &&
4793 v.owner == env.info.scope.owner.enclClass() &&
4794 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4795 (!env.tree.hasTag(ASSIGN) ||
4796 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4797 if (!onlyWarning || isStaticEnumField(v)) {
4798 Error errkey = (initEnv.info.enclVar == v) ?
4799 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4800 log.error(tree.pos(), errkey);
4801 } else if (useBeforeDeclarationWarning) {
4802 Warning warnkey = (initEnv.info.enclVar == v) ?
4803 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4804 log.warning(tree.pos(), warnkey);
4805 }
4806 }
4807
4808 v.getConstValue(); // ensure initializer is evaluated
4809
4810 checkEnumInitializer(tree, env, v);
4811 }
4812
4813 /**
4814 * Returns the enclosing init environment associated with this env (if any). An init env
4815 * can be either a field declaration env or a static/instance initializer env.
4816 */
4817 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4818 while (true) {
4819 switch (env.tree.getTag()) {
4820 case VARDEF:
4821 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4822 if (vdecl.sym.owner.kind == TYP) {
4823 //field
4824 return env;
4825 }
4826 break;
4827 case BLOCK:
4828 if (env.next.tree.hasTag(CLASSDEF)) {
4829 //instance/static initializer
4830 return env;
4831 }
4832 break;
4833 case METHODDEF:
4834 case CLASSDEF:
4835 case TOPLEVEL:
4836 return null;
4837 }
4838 Assert.checkNonNull(env.next);
4839 env = env.next;
4840 }
4841 }
4842
4843 /**
4844 * Check for illegal references to static members of enum. In
4845 * an enum type, constructors and initializers may not
4846 * reference its static members unless they are constant.
4847 *
4848 * @param tree The tree making up the variable reference.
4849 * @param env The current environment.
4850 * @param v The variable's symbol.
4851 * @jls 8.9 Enum Types
4852 */
4853 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4854 // JLS:
4855 //
4856 // "It is a compile-time error to reference a static field
4857 // of an enum type that is not a compile-time constant
4858 // (15.28) from constructors, instance initializer blocks,
4859 // or instance variable initializer expressions of that
4860 // type. It is a compile-time error for the constructors,
4861 // instance initializer blocks, or instance variable
4862 // initializer expressions of an enum constant e to refer
4863 // to itself or to an enum constant of the same type that
4864 // is declared to the right of e."
4865 if (isStaticEnumField(v)) {
4866 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4867
4868 if (enclClass == null || enclClass.owner == null)
4869 return;
4870
4871 // See if the enclosing class is the enum (or a
4872 // subclass thereof) declaring v. If not, this
4873 // reference is OK.
4874 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4875 return;
4876
4877 // If the reference isn't from an initializer, then
4878 // the reference is OK.
4879 if (!Resolve.isInitializer(env))
4880 return;
4881
4882 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4883 }
4884 }
4885
4886 /** Is the given symbol a static, non-constant field of an Enum?
4887 * Note: enum literals should not be regarded as such
4888 */
4889 private boolean isStaticEnumField(VarSymbol v) {
4890 return Flags.isEnum(v.owner) &&
4891 Flags.isStatic(v) &&
4892 !Flags.isConstant(v) &&
4893 v.name != names._class;
4894 }
4895
4896 /**
4897 * Check that method arguments conform to its instantiation.
4898 **/
4899 public Type checkMethod(Type site,
4900 final Symbol sym,
4901 ResultInfo resultInfo,
4902 Env<AttrContext> env,
4903 final List<JCExpression> argtrees,
4904 List<Type> argtypes,
4905 List<Type> typeargtypes) {
4906 // Test (5): if symbol is an instance method of a raw type, issue
4907 // an unchecked warning if its argument types change under erasure.
4908 if ((sym.flags() & STATIC) == 0 &&
4909 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4910 Type s = types.asOuterSuper(site, sym.owner);
4911 if (s != null && s.isRaw() &&
4912 !types.isSameTypes(sym.type.getParameterTypes(),
4913 sym.erasure(types).getParameterTypes())) {
4914 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4915 }
4916 }
4917
4918 if (env.info.defaultSuperCallSite != null) {
4919 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4920 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4921 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4922 List<MethodSymbol> icand_sup =
4923 types.interfaceCandidates(sup, (MethodSymbol)sym);
4924 if (icand_sup.nonEmpty() &&
4925 icand_sup.head != sym &&
4926 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4927 log.error(env.tree.pos(),
4928 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4929 break;
4930 }
4931 }
4932 env.info.defaultSuperCallSite = null;
4933 }
4934
4935 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4936 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4937 if (app.meth.hasTag(SELECT) &&
4938 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4939 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4940 }
4941 }
4942
4943 // Compute the identifier's instantiated type.
4944 // For methods, we need to compute the instance type by
4945 // Resolve.instantiate from the symbol's type as well as
4946 // any type arguments and value arguments.
4947 Warner noteWarner = new Warner();
4948 try {
4949 Type owntype = rs.checkMethod(
4950 env,
4951 site,
4952 sym,
4953 resultInfo,
4954 argtypes,
4955 typeargtypes,
4956 noteWarner);
4957
4958 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4959 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4960
4961 argtypes = argtypes.map(checkDeferredMap);
4962
4963 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4964 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4965 sym.name,
4966 rs.methodArguments(sym.type.getParameterTypes()),
4967 rs.methodArguments(argtypes.map(checkDeferredMap)),
4968 kindName(sym.location()),
4969 sym.location()));
4970 if (resultInfo.pt != Infer.anyPoly ||
4971 !owntype.hasTag(METHOD) ||
4972 !owntype.isPartial()) {
4973 //if this is not a partially inferred method type, erase return type. Otherwise,
4974 //erasure is carried out in PartiallyInferredMethodType.check().
4975 owntype = new MethodType(owntype.getParameterTypes(),
4976 types.erasure(owntype.getReturnType()),
4977 types.erasure(owntype.getThrownTypes()),
4978 syms.methodClass);
4979 }
4980 }
4981
4982 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4983 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4984 PolyKind.POLY : PolyKind.STANDALONE;
4985 TreeInfo.setPolyKind(env.tree, pkind);
4986
4987 return (resultInfo.pt == Infer.anyPoly) ?
4988 owntype :
4989 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4990 resultInfo.checkContext.inferenceContext());
4991 } catch (Infer.InferenceException ex) {
4992 //invalid target type - propagate exception outwards or report error
4993 //depending on the current check context
4994 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4995 return types.createErrorType(site);
4996 } catch (Resolve.InapplicableMethodException ex) {
4997 final JCDiagnostic diag = ex.getDiagnostic();
4998 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4999 @Override
5000 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5001 return new Pair<>(sym, diag);
5002 }
5003 };
5004 List<Type> argtypes2 = argtypes.map(
5005 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5006 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5007 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5008 log.report(errDiag);
5009 return types.createErrorType(site);
5010 }
5011 }
5012
5013 public void visitLiteral(JCLiteral tree) {
5014 result = check(tree, litType(tree.typetag).constType(tree.value),
5015 KindSelector.VAL, resultInfo);
5016 }
5017 //where
5018 /** Return the type of a literal with given type tag.
5019 */
5020 Type litType(TypeTag tag) {
5021 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5022 }
5023
5024 public void visitStringTemplate(JCStringTemplate tree) {
5025 JCExpression processor = tree.processor;
5026 Type resultType = syms.stringTemplateType;
5027
5028 if (processor != null) {
5029 resultType = attribTree(processor, env, new ResultInfo(KindSelector.VAL, Type.noType));
5030 resultType = chk.checkProcessorType(processor, resultType, env);
5031 }
5032
5033 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
5034
5035 for (JCExpression arg : tree.expressions) {
5036 chk.checkNonVoid(arg.pos(), attribExpr(arg, localEnv));
5037 }
5038
5039 tree.type = resultType;
5040 result = resultType;
5041
5042 check(tree, resultType, KindSelector.VAL, resultInfo);
5043 }
5044
5045 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5046 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5047 }
5048
5049 public void visitTypeArray(JCArrayTypeTree tree) {
5050 Type etype = attribType(tree.elemtype, env);
5051 Type type = new ArrayType(etype, syms.arrayClass);
5052 result = check(tree, type, KindSelector.TYP, resultInfo);
5053 }
5054
5055 /** Visitor method for parameterized types.
5056 * Bound checking is left until later, since types are attributed
5057 * before supertype structure is completely known
5058 */
5059 public void visitTypeApply(JCTypeApply tree) {
5060 Type owntype = types.createErrorType(tree.type);
5061
5062 // Attribute functor part of application and make sure it's a class.
5063 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5064
5065 // Attribute type parameters
5066 List<Type> actuals = attribTypes(tree.arguments, env);
5067
5068 if (clazztype.hasTag(CLASS)) {
5069 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5070 if (actuals.isEmpty()) //diamond
5071 actuals = formals;
5072
5073 if (actuals.length() == formals.length()) {
5074 List<Type> a = actuals;
5075 List<Type> f = formals;
5076 while (a.nonEmpty()) {
5077 a.head = a.head.withTypeVar(f.head);
5078 a = a.tail;
5079 f = f.tail;
5080 }
5081 // Compute the proper generic outer
5082 Type clazzOuter = clazztype.getEnclosingType();
5083 if (clazzOuter.hasTag(CLASS)) {
5084 Type site;
5085 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5086 if (clazz.hasTag(IDENT)) {
5087 site = env.enclClass.sym.type;
5088 } else if (clazz.hasTag(SELECT)) {
5089 site = ((JCFieldAccess) clazz).selected.type;
5090 } else throw new AssertionError(""+tree);
5091 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5092 if (site.hasTag(CLASS))
5093 site = types.asOuterSuper(site, clazzOuter.tsym);
5094 if (site == null)
5095 site = types.erasure(clazzOuter);
5096 clazzOuter = site;
5097 }
5098 }
5099 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5100 clazztype.getMetadata());
5101 } else {
5102 if (formals.length() != 0) {
5103 log.error(tree.pos(),
5104 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5105 } else {
5106 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5107 }
5108 owntype = types.createErrorType(tree.type);
5109 }
5110 }
5111 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5112 }
5113
5114 public void visitTypeUnion(JCTypeUnion tree) {
5115 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5116 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5117 for (JCExpression typeTree : tree.alternatives) {
5118 Type ctype = attribType(typeTree, env);
5119 ctype = chk.checkType(typeTree.pos(),
5120 chk.checkClassType(typeTree.pos(), ctype),
5121 syms.throwableType);
5122 if (!ctype.isErroneous()) {
5123 //check that alternatives of a union type are pairwise
5124 //unrelated w.r.t. subtyping
5125 if (chk.intersects(ctype, multicatchTypes.toList())) {
5126 for (Type t : multicatchTypes) {
5127 boolean sub = types.isSubtype(ctype, t);
5128 boolean sup = types.isSubtype(t, ctype);
5129 if (sub || sup) {
5130 //assume 'a' <: 'b'
5131 Type a = sub ? ctype : t;
5132 Type b = sub ? t : ctype;
5133 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5134 }
5135 }
5136 }
5137 multicatchTypes.append(ctype);
5138 if (all_multicatchTypes != null)
5139 all_multicatchTypes.append(ctype);
5140 } else {
5141 if (all_multicatchTypes == null) {
5142 all_multicatchTypes = new ListBuffer<>();
5143 all_multicatchTypes.appendList(multicatchTypes);
5144 }
5145 all_multicatchTypes.append(ctype);
5146 }
5147 }
5148 Type t = check(tree, types.lub(multicatchTypes.toList()),
5149 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5150 if (t.hasTag(CLASS)) {
5151 List<Type> alternatives =
5152 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5153 t = new UnionClassType((ClassType) t, alternatives);
5154 }
5155 tree.type = result = t;
5156 }
5157
5158 public void visitTypeIntersection(JCTypeIntersection tree) {
5159 attribTypes(tree.bounds, env);
5160 tree.type = result = checkIntersection(tree, tree.bounds);
5161 }
5162
5163 public void visitTypeParameter(JCTypeParameter tree) {
5164 TypeVar typeVar = (TypeVar) tree.type;
5165
5166 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5167 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5168 }
5169
5170 if (!typeVar.getUpperBound().isErroneous()) {
5171 //fixup type-parameter bound computed in 'attribTypeVariables'
5172 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5173 }
5174 }
5175
5176 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5177 Set<Symbol> boundSet = new HashSet<>();
5178 if (bounds.nonEmpty()) {
5179 // accept class or interface or typevar as first bound.
5180 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5181 boundSet.add(types.erasure(bounds.head.type).tsym);
5182 if (bounds.head.type.isErroneous()) {
5183 return bounds.head.type;
5184 }
5185 else if (bounds.head.type.hasTag(TYPEVAR)) {
5186 // if first bound was a typevar, do not accept further bounds.
5187 if (bounds.tail.nonEmpty()) {
5188 log.error(bounds.tail.head.pos(),
5189 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5190 return bounds.head.type;
5191 }
5192 } else {
5193 // if first bound was a class or interface, accept only interfaces
5194 // as further bounds.
5195 for (JCExpression bound : bounds.tail) {
5196 bound.type = checkBase(bound.type, bound, env, false, true, false);
5197 if (bound.type.isErroneous()) {
5198 bounds = List.of(bound);
5199 }
5200 else if (bound.type.hasTag(CLASS)) {
5201 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5202 }
5203 }
5204 }
5205 }
5206
5207 if (bounds.length() == 0) {
5208 return syms.objectType;
5209 } else if (bounds.length() == 1) {
5210 return bounds.head.type;
5211 } else {
5212 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5213 // ... the variable's bound is a class type flagged COMPOUND
5214 // (see comment for TypeVar.bound).
5215 // In this case, generate a class tree that represents the
5216 // bound class, ...
5217 JCExpression extending;
5218 List<JCExpression> implementing;
5219 if (!bounds.head.type.isInterface()) {
5220 extending = bounds.head;
5221 implementing = bounds.tail;
5222 } else {
5223 extending = null;
5224 implementing = bounds;
5225 }
5226 JCClassDecl cd = make.at(tree).ClassDef(
5227 make.Modifiers(PUBLIC | ABSTRACT),
5228 names.empty, List.nil(),
5229 extending, implementing, List.nil());
5230
5231 ClassSymbol c = (ClassSymbol)owntype.tsym;
5232 Assert.check((c.flags() & COMPOUND) != 0);
5233 cd.sym = c;
5234 c.sourcefile = env.toplevel.sourcefile;
5235
5236 // ... and attribute the bound class
5237 c.flags_field |= UNATTRIBUTED;
5238 Env<AttrContext> cenv = enter.classEnv(cd, env);
5239 typeEnvs.put(c, cenv);
5240 attribClass(c);
5241 return owntype;
5242 }
5243 }
5244
5245 public void visitWildcard(JCWildcard tree) {
5246 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5247 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5248 ? syms.objectType
5249 : attribType(tree.inner, env);
5250 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5251 tree.kind.kind,
5252 syms.boundClass),
5253 KindSelector.TYP, resultInfo);
5254 }
5255
5256 public void visitAnnotation(JCAnnotation tree) {
5257 Assert.error("should be handled in annotate");
5258 }
5259
5260 @Override
5261 public void visitModifiers(JCModifiers tree) {
5262 //error recovery only:
5263 Assert.check(resultInfo.pkind == KindSelector.ERR);
5264
5265 attribAnnotationTypes(tree.annotations, env);
5266 }
5267
5268 public void visitAnnotatedType(JCAnnotatedType tree) {
5269 attribAnnotationTypes(tree.annotations, env);
5270 Type underlyingType = attribType(tree.underlyingType, env);
5271 Type annotatedType = underlyingType.preannotatedType();
5272
5273 if (!env.info.isNewClass)
5274 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5275 result = tree.type = annotatedType;
5276 }
5277
5278 public void visitErroneous(JCErroneous tree) {
5279 if (tree.errs != null) {
5280 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup());
5281 errEnv.info.returnResult = unknownExprInfo;
5282 for (JCTree err : tree.errs)
5283 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5284 }
5285 result = tree.type = syms.errType;
5286 }
5287
5288 /** Default visitor method for all other trees.
5289 */
5290 public void visitTree(JCTree tree) {
5291 throw new AssertionError();
5292 }
5293
5294 /**
5295 * Attribute an env for either a top level tree or class or module declaration.
5296 */
5297 public void attrib(Env<AttrContext> env) {
5298 switch (env.tree.getTag()) {
5299 case MODULEDEF:
5300 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5301 break;
5302 case PACKAGEDEF:
5303 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5304 break;
5305 default:
5306 attribClass(env.tree.pos(), env.enclClass.sym);
5307 }
5308 }
5309
5310 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5311 try {
5312 annotate.flush();
5313 attribPackage(p);
5314 } catch (CompletionFailure ex) {
5315 chk.completionError(pos, ex);
5316 }
5317 }
5318
5319 void attribPackage(PackageSymbol p) {
5320 attribWithLint(p,
5321 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5322 }
5323
5324 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5325 try {
5326 annotate.flush();
5327 attribModule(m);
5328 } catch (CompletionFailure ex) {
5329 chk.completionError(pos, ex);
5330 }
5331 }
5332
5333 void attribModule(ModuleSymbol m) {
5334 attribWithLint(m, env -> attribStat(env.tree, env));
5335 }
5336
5337 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5338 Env<AttrContext> env = typeEnvs.get(sym);
5339
5340 Env<AttrContext> lintEnv = env;
5341 while (lintEnv.info.lint == null)
5342 lintEnv = lintEnv.next;
5343
5344 Lint lint = lintEnv.info.lint.augment(sym);
5345
5346 Lint prevLint = chk.setLint(lint);
5347 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5348
5349 try {
5350 deferredLintHandler.flush(env.tree.pos());
5351 attrib.accept(env);
5352 } finally {
5353 log.useSource(prev);
5354 chk.setLint(prevLint);
5355 }
5356 }
5357
5358 /** Main method: attribute class definition associated with given class symbol.
5359 * reporting completion failures at the given position.
5360 * @param pos The source position at which completion errors are to be
5361 * reported.
5362 * @param c The class symbol whose definition will be attributed.
5363 */
5364 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5365 try {
5366 annotate.flush();
5367 attribClass(c);
5368 } catch (CompletionFailure ex) {
5369 chk.completionError(pos, ex);
5370 }
5371 }
5372
5373 /** Attribute class definition associated with given class symbol.
5374 * @param c The class symbol whose definition will be attributed.
5375 */
5376 void attribClass(ClassSymbol c) throws CompletionFailure {
5377 if (c.type.hasTag(ERROR)) return;
5378
5379 // Check for cycles in the inheritance graph, which can arise from
5380 // ill-formed class files.
5381 chk.checkNonCyclic(null, c.type);
5382
5383 Type st = types.supertype(c.type);
5384 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5385 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5386 // First, attribute superclass.
5387 if (st.hasTag(CLASS))
5388 attribClass((ClassSymbol)st.tsym);
5389
5390 // Next attribute owner, if it is a class.
5391 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5392 attribClass((ClassSymbol)c.owner);
5393
5394 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5395 }
5396
5397 // The previous operations might have attributed the current class
5398 // if there was a cycle. So we test first whether the class is still
5399 // UNATTRIBUTED.
5400 if ((c.flags_field & UNATTRIBUTED) != 0) {
5401 c.flags_field &= ~UNATTRIBUTED;
5402
5403 // Get environment current at the point of class definition.
5404 Env<AttrContext> env = typeEnvs.get(c);
5405
5406 if (c.isSealed() &&
5407 !c.isEnum() &&
5408 !c.isPermittedExplicit &&
5409 c.permitted.isEmpty()) {
5410 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5411 }
5412
5413 if (c.isSealed()) {
5414 Set<Symbol> permittedTypes = new HashSet<>();
5415 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5416 for (Symbol subTypeSym : c.permitted) {
5417 boolean isTypeVar = false;
5418 if (subTypeSym.type.getTag() == TYPEVAR) {
5419 isTypeVar = true; //error recovery
5420 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5421 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5422 }
5423 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5424 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5425 }
5426 if (permittedTypes.contains(subTypeSym)) {
5427 DiagnosticPosition pos =
5428 env.enclClass.permitting.stream()
5429 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5430 .limit(2).collect(List.collector()).get(1);
5431 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5432 } else {
5433 permittedTypes.add(subTypeSym);
5434 }
5435 if (sealedInUnnamed) {
5436 if (subTypeSym.packge() != c.packge()) {
5437 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5438 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5439 );
5440 }
5441 } else if (subTypeSym.packge().modle != c.packge().modle) {
5442 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5443 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5444 );
5445 }
5446 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5447 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5448 Errors.InvalidPermitsClause(
5449 subTypeSym == c.type.tsym ?
5450 Fragments.MustNotBeSameClass :
5451 Fragments.MustNotBeSupertype(subTypeSym.type)
5452 )
5453 );
5454 } else if (!isTypeVar) {
5455 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5456 .stream()
5457 .anyMatch(d -> d.tsym == c);
5458 if (!thisIsASuper) {
5459 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5460 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5461 }
5462 }
5463 }
5464 }
5465
5466 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5467 .stream()
5468 .filter(s -> s.tsym.isSealed())
5469 .map(s -> (ClassSymbol) s.tsym)
5470 .collect(List.collector());
5471
5472 if (sealedSupers.isEmpty()) {
5473 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5474 boolean hasErrorSuper = false;
5475
5476 hasErrorSuper |= types.directSupertypes(c.type)
5477 .stream()
5478 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5479
5480 ClassType ct = (ClassType) c.type;
5481
5482 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5483
5484 if (!hasErrorSuper) {
5485 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5486 }
5487 }
5488 } else {
5489 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5490 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5491 }
5492
5493 if (!c.type.isCompound()) {
5494 for (ClassSymbol supertypeSym : sealedSupers) {
5495 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5496 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5497 }
5498 }
5499 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5500 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5501 c.isInterface() ?
5502 Errors.NonSealedOrSealedExpected :
5503 Errors.NonSealedSealedOrFinalExpected);
5504 }
5505 }
5506 }
5507
5508 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5509 // because the annotations were not available at the time the env was created. Therefore,
5510 // we look up the environment chain for the first enclosing environment for which the
5511 // lint value is set. Typically, this is the parent env, but might be further if there
5512 // are any envs created as a result of TypeParameter nodes.
5513 Env<AttrContext> lintEnv = env;
5514 while (lintEnv.info.lint == null)
5515 lintEnv = lintEnv.next;
5516
5517 // Having found the enclosing lint value, we can initialize the lint value for this class
5518 env.info.lint = lintEnv.info.lint.augment(c);
5519
5520 Lint prevLint = chk.setLint(env.info.lint);
5521 JavaFileObject prev = log.useSource(c.sourcefile);
5522 ResultInfo prevReturnRes = env.info.returnResult;
5523
5524 try {
5525 deferredLintHandler.flush(env.tree);
5526 env.info.returnResult = null;
5527 // java.lang.Enum may not be subclassed by a non-enum
5528 if (st.tsym == syms.enumSym &&
5529 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5530 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5531
5532 // Enums may not be extended by source-level classes
5533 if (st.tsym != null &&
5534 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5535 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5536 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5537 }
5538
5539 if (rs.isSerializable(c.type)) {
5540 env.info.isSerializable = true;
5541 }
5542
5543 attribClassBody(env, c);
5544
5545 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5546 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5547 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5548 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5549
5550 if ((c.flags_field & Flags.UNNAMED_CLASS) != 0) {
5551 chk.checkHasMain(env.tree.pos(), c);
5552 }
5553 } finally {
5554 env.info.returnResult = prevReturnRes;
5555 log.useSource(prev);
5556 chk.setLint(prevLint);
5557 }
5558
5559 }
5560 }
5561
5562 public void visitImport(JCImport tree) {
5563 // nothing to do
5564 }
5565
5566 public void visitModuleDef(JCModuleDecl tree) {
5567 tree.sym.completeUsesProvides();
5568 ModuleSymbol msym = tree.sym;
5569 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5570 Lint prevLint = chk.setLint(lint);
5571 chk.checkModuleName(tree);
5572 chk.checkDeprecatedAnnotation(tree, msym);
5573
5574 try {
5575 deferredLintHandler.flush(tree.pos());
5576 } finally {
5577 chk.setLint(prevLint);
5578 }
5579 }
5580
5581 /** Finish the attribution of a class. */
5582 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5583 JCClassDecl tree = (JCClassDecl)env.tree;
5584 Assert.check(c == tree.sym);
5585
5586 // Validate type parameters, supertype and interfaces.
5587 attribStats(tree.typarams, env);
5588 if (!c.isAnonymous()) {
5589 //already checked if anonymous
5590 chk.validate(tree.typarams, env);
5591 chk.validate(tree.extending, env);
5592 chk.validate(tree.implementing, env);
5593 }
5594
5595 c.markAbstractIfNeeded(types);
5596
5597 // If this is a non-abstract class, check that it has no abstract
5598 // methods or unimplemented methods of an implemented interface.
5599 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5600 chk.checkAllDefined(tree.pos(), c);
5601 }
5602
5603 if ((c.flags() & ANNOTATION) != 0) {
5604 if (tree.implementing.nonEmpty())
5605 log.error(tree.implementing.head.pos(),
5606 Errors.CantExtendIntfAnnotation);
5607 if (tree.typarams.nonEmpty()) {
5608 log.error(tree.typarams.head.pos(),
5609 Errors.IntfAnnotationCantHaveTypeParams(c));
5610 }
5611
5612 // If this annotation type has a @Repeatable, validate
5613 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5614 // If this annotation type has a @Repeatable, validate
5615 if (repeatable != null) {
5616 // get diagnostic position for error reporting
5617 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5618 Assert.checkNonNull(cbPos);
5619
5620 chk.validateRepeatable(c, repeatable, cbPos);
5621 }
5622 } else {
5623 // Check that all extended classes and interfaces
5624 // are compatible (i.e. no two define methods with same arguments
5625 // yet different return types). (JLS 8.4.8.3)
5626 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5627 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5628 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5629 }
5630
5631 // Check that class does not import the same parameterized interface
5632 // with two different argument lists.
5633 chk.checkClassBounds(tree.pos(), c.type);
5634
5635 tree.type = c.type;
5636
5637 for (List<JCTypeParameter> l = tree.typarams;
5638 l.nonEmpty(); l = l.tail) {
5639 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5640 }
5641
5642 // Check that a generic class doesn't extend Throwable
5643 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5644 log.error(tree.extending.pos(), Errors.GenericThrowable);
5645
5646 // Check that all methods which implement some
5647 // method conform to the method they implement.
5648 chk.checkImplementations(tree);
5649
5650 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5651 checkAutoCloseable(tree.pos(), env, c.type);
5652
5653 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5654 // Attribute declaration
5655 attribStat(l.head, env);
5656 // Check that declarations in inner classes are not static (JLS 8.1.2)
5657 // Make an exception for static constants.
5658 if (!allowRecords &&
5659 c.owner.kind != PCK &&
5660 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5661 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5662 VarSymbol sym = null;
5663 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5664 if (sym == null ||
5665 sym.kind != VAR ||
5666 sym.getConstValue() == null)
5667 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5668 }
5669 }
5670
5671 // Check for cycles among non-initial constructors.
5672 chk.checkCyclicConstructors(tree);
5673
5674 // Check for cycles among annotation elements.
5675 chk.checkNonCyclicElements(tree);
5676
5677 // Check for proper use of serialVersionUID and other
5678 // serialization-related fields and methods
5679 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5680 && rs.isSerializable(c.type)
5681 && !c.isAnonymous()) {
5682 chk.checkSerialStructure(tree, c);
5683 }
5684 // Correctly organize the positions of the type annotations
5685 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5686
5687 // Check type annotations applicability rules
5688 validateTypeAnnotations(tree, false);
5689 }
5690 // where
5691 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5692 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5693 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5694 if (types.isSameType(al.head.annotationType.type, t))
5695 return al.head.pos();
5696 }
5697
5698 return null;
5699 }
5700
5701 private Type capture(Type type) {
5702 return types.capture(type);
5703 }
5704
5705 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5706 if (type.isErroneous()) {
5707 tree.vartype = make.at(Position.NOPOS).Erroneous();
5708 } else {
5709 tree.vartype = make.at(Position.NOPOS).Type(type);
5710 }
5711 }
5712
5713 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5714 tree.accept(new TypeAnnotationsValidator(sigOnly));
5715 }
5716 //where
5717 private final class TypeAnnotationsValidator extends TreeScanner {
5718
5719 private final boolean sigOnly;
5720 public TypeAnnotationsValidator(boolean sigOnly) {
5721 this.sigOnly = sigOnly;
5722 }
5723
5724 public void visitAnnotation(JCAnnotation tree) {
5725 chk.validateTypeAnnotation(tree, null, false);
5726 super.visitAnnotation(tree);
5727 }
5728 public void visitAnnotatedType(JCAnnotatedType tree) {
5729 if (!tree.underlyingType.type.isErroneous()) {
5730 super.visitAnnotatedType(tree);
5731 }
5732 }
5733 public void visitTypeParameter(JCTypeParameter tree) {
5734 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5735 scan(tree.bounds);
5736 // Don't call super.
5737 // This is needed because above we call validateTypeAnnotation with
5738 // false, which would forbid annotations on type parameters.
5739 // super.visitTypeParameter(tree);
5740 }
5741 public void visitMethodDef(JCMethodDecl tree) {
5742 if (tree.recvparam != null &&
5743 !tree.recvparam.vartype.type.isErroneous()) {
5744 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5745 }
5746 if (tree.restype != null && tree.restype.type != null) {
5747 validateAnnotatedType(tree.restype, tree.restype.type);
5748 }
5749 if (sigOnly) {
5750 scan(tree.mods);
5751 scan(tree.restype);
5752 scan(tree.typarams);
5753 scan(tree.recvparam);
5754 scan(tree.params);
5755 scan(tree.thrown);
5756 } else {
5757 scan(tree.defaultValue);
5758 scan(tree.body);
5759 }
5760 }
5761 public void visitVarDef(final JCVariableDecl tree) {
5762 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5763 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5764 validateAnnotatedType(tree.vartype, tree.sym.type);
5765 scan(tree.mods);
5766 scan(tree.vartype);
5767 if (!sigOnly) {
5768 scan(tree.init);
5769 }
5770 }
5771 public void visitTypeCast(JCTypeCast tree) {
5772 if (tree.clazz != null && tree.clazz.type != null)
5773 validateAnnotatedType(tree.clazz, tree.clazz.type);
5774 super.visitTypeCast(tree);
5775 }
5776 public void visitTypeTest(JCInstanceOf tree) {
5777 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5778 validateAnnotatedType(tree.pattern, tree.pattern.type);
5779 super.visitTypeTest(tree);
5780 }
5781 public void visitNewClass(JCNewClass tree) {
5782 if (tree.clazz != null && tree.clazz.type != null) {
5783 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5784 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5785 tree.clazz.type.tsym);
5786 }
5787 if (tree.def != null) {
5788 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5789 }
5790
5791 validateAnnotatedType(tree.clazz, tree.clazz.type);
5792 }
5793 super.visitNewClass(tree);
5794 }
5795 public void visitNewArray(JCNewArray tree) {
5796 if (tree.elemtype != null && tree.elemtype.type != null) {
5797 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5798 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5799 tree.elemtype.type.tsym);
5800 }
5801 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5802 }
5803 super.visitNewArray(tree);
5804 }
5805 public void visitClassDef(JCClassDecl tree) {
5806 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5807 if (sigOnly) {
5808 scan(tree.mods);
5809 scan(tree.typarams);
5810 scan(tree.extending);
5811 scan(tree.implementing);
5812 }
5813 for (JCTree member : tree.defs) {
5814 if (member.hasTag(Tag.CLASSDEF)) {
5815 continue;
5816 }
5817 scan(member);
5818 }
5819 }
5820 public void visitBlock(JCBlock tree) {
5821 if (!sigOnly) {
5822 scan(tree.stats);
5823 }
5824 }
5825
5826 /* I would want to model this after
5827 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5828 * and override visitSelect and visitTypeApply.
5829 * However, we only set the annotated type in the top-level type
5830 * of the symbol.
5831 * Therefore, we need to override each individual location where a type
5832 * can occur.
5833 */
5834 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5835 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5836
5837 if (type.isPrimitiveOrVoid()) {
5838 return;
5839 }
5840
5841 JCTree enclTr = errtree;
5842 Type enclTy = type;
5843
5844 boolean repeat = true;
5845 while (repeat) {
5846 if (enclTr.hasTag(TYPEAPPLY)) {
5847 List<Type> tyargs = enclTy.getTypeArguments();
5848 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5849 if (trargs.length() > 0) {
5850 // Nothing to do for diamonds
5851 if (tyargs.length() == trargs.length()) {
5852 for (int i = 0; i < tyargs.length(); ++i) {
5853 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5854 }
5855 }
5856 // If the lengths don't match, it's either a diamond
5857 // or some nested type that redundantly provides
5858 // type arguments in the tree.
5859 }
5860
5861 // Look at the clazz part of a generic type
5862 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5863 }
5864
5865 if (enclTr.hasTag(SELECT)) {
5866 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5867 if (enclTy != null &&
5868 !enclTy.hasTag(NONE)) {
5869 enclTy = enclTy.getEnclosingType();
5870 }
5871 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5872 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5873 if (enclTy == null || enclTy.hasTag(NONE)) {
5874 if (at.getAnnotations().size() == 1) {
5875 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5876 } else {
5877 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5878 for (JCAnnotation an : at.getAnnotations()) {
5879 comps.add(an.attribute);
5880 }
5881 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5882 }
5883 repeat = false;
5884 }
5885 enclTr = at.underlyingType;
5886 // enclTy doesn't need to be changed
5887 } else if (enclTr.hasTag(IDENT)) {
5888 repeat = false;
5889 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5890 JCWildcard wc = (JCWildcard) enclTr;
5891 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5892 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5893 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5894 } else {
5895 // Nothing to do for UNBOUND
5896 }
5897 repeat = false;
5898 } else if (enclTr.hasTag(TYPEARRAY)) {
5899 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5900 validateAnnotatedType(art.getType(), art.elemtype.type);
5901 repeat = false;
5902 } else if (enclTr.hasTag(TYPEUNION)) {
5903 JCTypeUnion ut = (JCTypeUnion) enclTr;
5904 for (JCTree t : ut.getTypeAlternatives()) {
5905 validateAnnotatedType(t, t.type);
5906 }
5907 repeat = false;
5908 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5909 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5910 for (JCTree t : it.getBounds()) {
5911 validateAnnotatedType(t, t.type);
5912 }
5913 repeat = false;
5914 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5915 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5916 repeat = false;
5917 } else {
5918 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5919 " within: "+ errtree + " with kind: " + errtree.getKind());
5920 }
5921 }
5922 }
5923
5924 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5925 Symbol sym) {
5926 // Ensure that no declaration annotations are present.
5927 // Note that a tree type might be an AnnotatedType with
5928 // empty annotations, if only declaration annotations were given.
5929 // This method will raise an error for such a type.
5930 for (JCAnnotation ai : annotations) {
5931 if (!ai.type.isErroneous() &&
5932 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5933 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5934 }
5935 }
5936 }
5937 }
5938
5939 // <editor-fold desc="post-attribution visitor">
5940
5941 /**
5942 * Handle missing types/symbols in an AST. This routine is useful when
5943 * the compiler has encountered some errors (which might have ended up
5944 * terminating attribution abruptly); if the compiler is used in fail-over
5945 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5946 * prevents NPE to be propagated during subsequent compilation steps.
5947 */
5948 public void postAttr(JCTree tree) {
5949 new PostAttrAnalyzer().scan(tree);
5950 }
5951
5952 class PostAttrAnalyzer extends TreeScanner {
5953
5954 private void initTypeIfNeeded(JCTree that) {
5955 if (that.type == null) {
5956 if (that.hasTag(METHODDEF)) {
5957 that.type = dummyMethodType((JCMethodDecl)that);
5958 } else {
5959 that.type = syms.unknownType;
5960 }
5961 }
5962 }
5963
5964 /* Construct a dummy method type. If we have a method declaration,
5965 * and the declared return type is void, then use that return type
5966 * instead of UNKNOWN to avoid spurious error messages in lambda
5967 * bodies (see:JDK-8041704).
5968 */
5969 private Type dummyMethodType(JCMethodDecl md) {
5970 Type restype = syms.unknownType;
5971 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5972 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5973 if (prim.typetag == VOID)
5974 restype = syms.voidType;
5975 }
5976 return new MethodType(List.nil(), restype,
5977 List.nil(), syms.methodClass);
5978 }
5979 private Type dummyMethodType() {
5980 return dummyMethodType(null);
5981 }
5982
5983 @Override
5984 public void scan(JCTree tree) {
5985 if (tree == null) return;
5986 if (tree instanceof JCExpression) {
5987 initTypeIfNeeded(tree);
5988 }
5989 super.scan(tree);
5990 }
5991
5992 @Override
5993 public void visitIdent(JCIdent that) {
5994 if (that.sym == null) {
5995 that.sym = syms.unknownSymbol;
5996 }
5997 }
5998
5999 @Override
6000 public void visitSelect(JCFieldAccess that) {
6001 if (that.sym == null) {
6002 that.sym = syms.unknownSymbol;
6003 }
6004 super.visitSelect(that);
6005 }
6006
6007 @Override
6008 public void visitClassDef(JCClassDecl that) {
6009 initTypeIfNeeded(that);
6010 if (that.sym == null) {
6011 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6012 }
6013 super.visitClassDef(that);
6014 }
6015
6016 @Override
6017 public void visitMethodDef(JCMethodDecl that) {
6018 initTypeIfNeeded(that);
6019 if (that.sym == null) {
6020 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6021 }
6022 super.visitMethodDef(that);
6023 }
6024
6025 @Override
6026 public void visitVarDef(JCVariableDecl that) {
6027 initTypeIfNeeded(that);
6028 if (that.sym == null) {
6029 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6030 that.sym.adr = 0;
6031 }
6032 if (that.vartype == null) {
6033 that.vartype = make.at(Position.NOPOS).Erroneous();
6034 }
6035 super.visitVarDef(that);
6036 }
6037
6038 @Override
6039 public void visitBindingPattern(JCBindingPattern that) {
6040 initTypeIfNeeded(that);
6041 initTypeIfNeeded(that.var);
6042 if (that.var.sym == null) {
6043 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6044 that.var.sym.adr = 0;
6045 }
6046 super.visitBindingPattern(that);
6047 }
6048
6049 @Override
6050 public void visitNewClass(JCNewClass that) {
6051 if (that.constructor == null) {
6052 that.constructor = new MethodSymbol(0, names.init,
6053 dummyMethodType(), syms.noSymbol);
6054 }
6055 if (that.constructorType == null) {
6056 that.constructorType = syms.unknownType;
6057 }
6058 super.visitNewClass(that);
6059 }
6060
6061 @Override
6062 public void visitAssignop(JCAssignOp that) {
6063 if (that.operator == null) {
6064 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6065 -1, syms.noSymbol);
6066 }
6067 super.visitAssignop(that);
6068 }
6069
6070 @Override
6071 public void visitBinary(JCBinary that) {
6072 if (that.operator == null) {
6073 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6074 -1, syms.noSymbol);
6075 }
6076 super.visitBinary(that);
6077 }
6078
6079 @Override
6080 public void visitUnary(JCUnary that) {
6081 if (that.operator == null) {
6082 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6083 -1, syms.noSymbol);
6084 }
6085 super.visitUnary(that);
6086 }
6087
6088 @Override
6089 public void visitReference(JCMemberReference that) {
6090 super.visitReference(that);
6091 if (that.sym == null) {
6092 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6093 syms.noSymbol);
6094 }
6095 }
6096 }
6097 // </editor-fold>
6098
6099 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6100 new TreeScanner() {
6101 Symbol packge = pkg;
6102 @Override
6103 public void visitIdent(JCIdent that) {
6104 that.sym = packge;
6105 }
6106
6107 @Override
6108 public void visitSelect(JCFieldAccess that) {
6109 that.sym = packge;
6110 packge = packge.owner;
6111 super.visitSelect(that);
6112 }
6113 }.scan(pid);
6114 }
6115
6116 }