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