1 /*
2 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
62 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
63 import com.sun.tools.javac.tree.*;
64 import com.sun.tools.javac.tree.JCTree.*;
65 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
66 import com.sun.tools.javac.util.*;
67 import com.sun.tools.javac.util.DefinedBy.Api;
68 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
69 import com.sun.tools.javac.util.JCDiagnostic.Error;
70 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
71 import com.sun.tools.javac.util.JCDiagnostic.Warning;
72 import com.sun.tools.javac.util.List;
73
74 import static com.sun.tools.javac.code.Flags.*;
75 import static com.sun.tools.javac.code.Flags.ANNOTATION;
76 import static com.sun.tools.javac.code.Flags.BLOCK;
77 import static com.sun.tools.javac.code.Kinds.*;
78 import static com.sun.tools.javac.code.Kinds.Kind.*;
79 import static com.sun.tools.javac.code.TypeTag.*;
80 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
81 import static com.sun.tools.javac.tree.JCTree.Tag.*;
82 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final Symtab syms;
103 final Resolve rs;
104 final Operators operators;
105 final Infer infer;
106 final Analyzer analyzer;
107 final DeferredAttr deferredAttr;
108 final Check chk;
109 final Flow flow;
110 final MemberEnter memberEnter;
111 final TypeEnter typeEnter;
112 final TreeMaker make;
113 final ConstFold cfolder;
114 final Enter enter;
115 final Target target;
116 final Types types;
117 final Preview preview;
118 final JCDiagnostic.Factory diags;
119 final TypeAnnotations typeAnnotations;
120 final DeferredLintHandler deferredLintHandler;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127
128 public static Attr instance(Context context) {
129 Attr instance = context.get(attrKey);
130 if (instance == null)
131 instance = new Attr(context);
132 return instance;
133 }
134
135 @SuppressWarnings("this-escape")
136 protected Attr(Context context) {
137 context.put(attrKey, this);
138
139 names = Names.instance(context);
140 log = Log.instance(context);
141 syms = Symtab.instance(context);
142 rs = Resolve.instance(context);
143 operators = Operators.instance(context);
144 chk = Check.instance(context);
145 flow = Flow.instance(context);
146 memberEnter = MemberEnter.instance(context);
147 typeEnter = TypeEnter.instance(context);
148 make = TreeMaker.instance(context);
149 enter = Enter.instance(context);
150 infer = Infer.instance(context);
151 analyzer = Analyzer.instance(context);
152 deferredAttr = DeferredAttr.instance(context);
153 cfolder = ConstFold.instance(context);
154 target = Target.instance(context);
155 types = Types.instance(context);
156 preview = Preview.instance(context);
157 diags = JCDiagnostic.Factory.instance(context);
158 annotate = Annotate.instance(context);
159 typeAnnotations = TypeAnnotations.instance(context);
160 deferredLintHandler = DeferredLintHandler.instance(context);
161 typeEnvs = TypeEnvs.instance(context);
162 dependencies = Dependencies.instance(context);
163 argumentAttr = ArgumentAttr.instance(context);
164 matchBindingsComputer = MatchBindingsComputer.instance(context);
165 attrRecover = AttrRecover.instance(context);
166
167 Options options = Options.instance(context);
168
169 Source source = Source.instance(context);
170 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
171 allowRecords = Feature.RECORDS.allowedInSource(source);
172 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
173 Feature.PATTERN_SWITCH.allowedInSource(source);
174 allowUnconditionalPatternsInstanceOf =
175 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
176 sourceName = source.name;
177 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
178
179 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
180 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
181 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
182 methodAttrInfo = new MethodAttrInfo();
183 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
184 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
185 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
186 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
187 allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
188 Feature.VALUE_CLASSES.allowedInSource(source);
189 }
190
191 /** Switch: reifiable types in instanceof enabled?
192 */
193 boolean allowReifiableTypesInInstanceof;
194
195 /** Are records allowed
196 */
197 private final boolean allowRecords;
198
199 /** Are patterns in switch allowed
200 */
201 private final boolean allowPatternSwitch;
202
203 /** Are unconditional patterns in instanceof allowed
204 */
205 private final boolean allowUnconditionalPatternsInstanceOf;
206
207 /** Are value classes allowed
208 */
209 private final boolean allowValueClasses;
210
211 /**
212 * Switch: warn about use of variable before declaration?
213 * RFE: 6425594
214 */
215 boolean useBeforeDeclarationWarning;
216
217 /**
218 * Switch: name of source level; used for error reporting.
219 */
220 String sourceName;
221
222 /** Check kind and type of given tree against protokind and prototype.
223 * If check succeeds, store type in tree and return it.
224 * If check fails, store errType in tree and return it.
225 * No checks are performed if the prototype is a method type.
226 * It is not necessary in this case since we know that kind and type
227 * are correct.
228 *
229 * @param tree The tree whose kind and type is checked
230 * @param found The computed type of the tree
231 * @param ownkind The computed kind of the tree
232 * @param resultInfo The expected result of the tree
233 */
234 Type check(final JCTree tree,
235 final Type found,
236 final KindSelector ownkind,
237 final ResultInfo resultInfo) {
238 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
239 Type owntype;
240 boolean shouldCheck = !found.hasTag(ERROR) &&
241 !resultInfo.pt.hasTag(METHOD) &&
242 !resultInfo.pt.hasTag(FORALL);
243 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
244 log.error(tree.pos(),
245 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
246 ownkind.kindNames()));
247 owntype = types.createErrorType(found);
248 } else if (inferenceContext.free(found)) {
249 //delay the check if there are inference variables in the found type
250 //this means we are dealing with a partially inferred poly expression
251 owntype = shouldCheck ? resultInfo.pt : found;
252 if (resultInfo.checkMode.installPostInferenceHook()) {
253 inferenceContext.addFreeTypeListener(List.of(found),
254 instantiatedContext -> {
255 ResultInfo pendingResult =
256 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
257 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
258 });
259 }
260 } else {
261 owntype = shouldCheck ?
262 resultInfo.check(tree, found) :
263 found;
264 }
265 if (resultInfo.checkMode.updateTreeType()) {
266 tree.type = owntype;
267 }
268 return owntype;
269 }
270
271 /** Is given blank final variable assignable, i.e. in a scope where it
272 * may be assigned to even though it is final?
273 * @param v The blank final variable.
274 * @param env The current environment.
275 */
276 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
277 Symbol owner = env.info.scope.owner;
278 // owner refers to the innermost variable, method or
279 // initializer block declaration at this point.
280 boolean isAssignable =
281 v.owner == owner
282 ||
283 ((owner.name == names.init || // i.e. we are in a constructor
284 owner.kind == VAR || // i.e. we are in a variable initializer
285 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
286 &&
287 v.owner == owner.owner
288 &&
289 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
290 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
291 return isAssignable & !insideCompactConstructor;
292 }
293
294 /** Check that variable can be assigned to.
295 * @param pos The current source code position.
296 * @param v The assigned variable
297 * @param base If the variable is referred to in a Select, the part
298 * to the left of the `.', null otherwise.
299 * @param env The current environment.
300 */
301 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
302 if (v.name == names._this) {
303 log.error(pos, Errors.CantAssignValToThis);
304 return;
305 }
306 if ((v.flags() & FINAL) != 0 &&
307 ((v.flags() & HASINIT) != 0
308 ||
309 !((base == null ||
310 TreeInfo.isThisQualifier(base)) &&
311 isAssignableAsBlankFinal(v, env)))) {
312 if (v.isResourceVariable()) { //TWR resource
313 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
314 } else {
315 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
316 }
317 return;
318 }
319
320 // Check instance field assignments that appear in constructor prologues
321 if (rs.isEarlyReference(env, base, v)) {
322
323 // Field may not be inherited from a superclass
324 if (v.owner != env.enclClass.sym) {
325 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
326 return;
327 }
328
329 // Field may not have an initializer
330 if ((v.flags() & HASINIT) != 0) {
331 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
332 return;
333 }
334 }
335 }
336
337 /** Does tree represent a static reference to an identifier?
338 * It is assumed that tree is either a SELECT or an IDENT.
339 * We have to weed out selects from non-type names here.
340 * @param tree The candidate tree.
341 */
342 boolean isStaticReference(JCTree tree) {
343 if (tree.hasTag(SELECT)) {
344 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
345 if (lsym == null || lsym.kind != TYP) {
346 return false;
347 }
348 }
349 return true;
350 }
351
352 /** Is this symbol a type?
353 */
354 static boolean isType(Symbol sym) {
355 return sym != null && sym.kind == TYP;
356 }
357
358 /** Attribute a parsed identifier.
359 * @param tree Parsed identifier name
360 * @param topLevel The toplevel to use
361 */
362 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
363 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
364 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
365 syms.errSymbol.name,
366 null, null, null, null);
367 localEnv.enclClass.sym = syms.errSymbol;
368 return attribIdent(tree, localEnv);
369 }
370
371 /** Attribute a parsed identifier.
372 * @param tree Parsed identifier name
373 * @param env The env to use
374 */
375 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
376 return tree.accept(identAttributer, env);
377 }
378 // where
379 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
380 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
381 @Override @DefinedBy(Api.COMPILER_TREE)
382 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
383 Symbol site = visit(node.getExpression(), env);
384 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
385 return site;
386 Name name = (Name)node.getIdentifier();
387 if (site.kind == PCK) {
388 env.toplevel.packge = (PackageSymbol)site;
389 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
390 KindSelector.TYP_PCK);
391 } else {
392 env.enclClass.sym = (ClassSymbol)site;
393 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
394 }
395 }
396
397 @Override @DefinedBy(Api.COMPILER_TREE)
398 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
399 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
400 }
401 }
402
403 public Type coerce(Type etype, Type ttype) {
404 return cfolder.coerce(etype, ttype);
405 }
406
407 public Type attribType(JCTree node, TypeSymbol sym) {
408 Env<AttrContext> env = typeEnvs.get(sym);
409 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
410 return attribTree(node, localEnv, unknownTypeInfo);
411 }
412
413 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
414 // Attribute qualifying package or class.
415 JCFieldAccess s = tree.qualid;
416 return attribTree(s.selected, env,
417 new ResultInfo(tree.staticImport ?
418 KindSelector.TYP : KindSelector.TYP_PCK,
419 Type.noType));
420 }
421
422 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
423 return attribToTree(expr, env, tree, unknownExprInfo);
424 }
425
426 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
427 return attribToTree(stmt, env, tree, statInfo);
428 }
429
430 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
431 breakTree = tree;
432 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
433 try {
434 deferredAttr.attribSpeculative(root, env, resultInfo,
435 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
436 argumentAttr.withLocalCacheContext());
437 attrRecover.doRecovery();
438 } catch (BreakAttr b) {
439 return b.env;
440 } catch (AssertionError ae) {
441 if (ae.getCause() instanceof BreakAttr breakAttr) {
442 return breakAttr.env;
443 } else {
444 throw ae;
445 }
446 } finally {
447 breakTree = null;
448 log.useSource(prev);
449 }
450 return env;
451 }
452
453 private JCTree breakTree = null;
454
455 private static class BreakAttr extends RuntimeException {
456 static final long serialVersionUID = -6924771130405446405L;
457 private transient Env<AttrContext> env;
458 private BreakAttr(Env<AttrContext> env) {
459 this.env = env;
460 }
461 }
462
463 /**
464 * Mode controlling behavior of Attr.Check
465 */
466 enum CheckMode {
467
468 NORMAL,
469
470 /**
471 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
472 * that the captured var cache in {@code InferenceContext} will be used in read-only
473 * mode when performing inference checks.
474 */
475 NO_TREE_UPDATE {
476 @Override
477 public boolean updateTreeType() {
478 return false;
479 }
480 },
481 /**
482 * Mode signalling that caller will manage free types in tree decorations.
483 */
484 NO_INFERENCE_HOOK {
485 @Override
486 public boolean installPostInferenceHook() {
487 return false;
488 }
489 };
490
491 public boolean updateTreeType() {
492 return true;
493 }
494 public boolean installPostInferenceHook() {
495 return true;
496 }
497 }
498
499
500 class ResultInfo {
501 final KindSelector pkind;
502 final Type pt;
503 final CheckContext checkContext;
504 final CheckMode checkMode;
505
506 ResultInfo(KindSelector pkind, Type pt) {
507 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
508 }
509
510 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
511 this(pkind, pt, chk.basicHandler, checkMode);
512 }
513
514 protected ResultInfo(KindSelector pkind,
515 Type pt, CheckContext checkContext) {
516 this(pkind, pt, checkContext, CheckMode.NORMAL);
517 }
518
519 protected ResultInfo(KindSelector pkind,
520 Type pt, CheckContext checkContext, CheckMode checkMode) {
521 this.pkind = pkind;
522 this.pt = pt;
523 this.checkContext = checkContext;
524 this.checkMode = checkMode;
525 }
526
527 /**
528 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
529 * @param tree The tree to be type-checked.
530 * @return true if {@code ArgumentAttr} should be used.
531 */
532 protected boolean needsArgumentAttr(JCTree tree) { return false; }
533
534 protected Type check(final DiagnosticPosition pos, final Type found) {
535 return chk.checkType(pos, found, pt, checkContext);
536 }
537
538 protected ResultInfo dup(Type newPt) {
539 return new ResultInfo(pkind, newPt, checkContext, checkMode);
540 }
541
542 protected ResultInfo dup(CheckContext newContext) {
543 return new ResultInfo(pkind, pt, newContext, checkMode);
544 }
545
546 protected ResultInfo dup(Type newPt, CheckContext newContext) {
547 return new ResultInfo(pkind, newPt, newContext, checkMode);
548 }
549
550 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
551 return new ResultInfo(pkind, newPt, newContext, newMode);
552 }
553
554 protected ResultInfo dup(CheckMode newMode) {
555 return new ResultInfo(pkind, pt, checkContext, newMode);
556 }
557
558 @Override
559 public String toString() {
560 if (pt != null) {
561 return pt.toString();
562 } else {
563 return "";
564 }
565 }
566 }
567
568 class MethodAttrInfo extends ResultInfo {
569 public MethodAttrInfo() {
570 this(chk.basicHandler);
571 }
572
573 public MethodAttrInfo(CheckContext checkContext) {
574 super(KindSelector.VAL, Infer.anyPoly, checkContext);
575 }
576
577 @Override
578 protected boolean needsArgumentAttr(JCTree tree) {
579 return true;
580 }
581
582 protected ResultInfo dup(Type newPt) {
583 throw new IllegalStateException();
584 }
585
586 protected ResultInfo dup(CheckContext newContext) {
587 return new MethodAttrInfo(newContext);
588 }
589
590 protected ResultInfo dup(Type newPt, CheckContext newContext) {
591 throw new IllegalStateException();
592 }
593
594 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
595 throw new IllegalStateException();
596 }
597
598 protected ResultInfo dup(CheckMode newMode) {
599 throw new IllegalStateException();
600 }
601 }
602
603 class RecoveryInfo extends ResultInfo {
604
605 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
606 this(deferredAttrContext, Type.recoveryType);
607 }
608
609 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
610 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
611 @Override
612 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
613 return deferredAttrContext;
614 }
615 @Override
616 public boolean compatible(Type found, Type req, Warner warn) {
617 return true;
618 }
619 @Override
620 public void report(DiagnosticPosition pos, JCDiagnostic details) {
621 boolean needsReport = pt == Type.recoveryType ||
622 (details.getDiagnosticPosition() != null &&
623 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
624 if (needsReport) {
625 chk.basicHandler.report(pos, details);
626 }
627 }
628 });
629 }
630 }
631
632 final ResultInfo statInfo;
633 final ResultInfo varAssignmentInfo;
634 final ResultInfo methodAttrInfo;
635 final ResultInfo unknownExprInfo;
636 final ResultInfo unknownTypeInfo;
637 final ResultInfo unknownTypeExprInfo;
638 final ResultInfo recoveryInfo;
639 final MethodType initBlockType;
640
641 Type pt() {
642 return resultInfo.pt;
643 }
644
645 KindSelector pkind() {
646 return resultInfo.pkind;
647 }
648
649 /* ************************************************************************
650 * Visitor methods
651 *************************************************************************/
652
653 /** Visitor argument: the current environment.
654 */
655 Env<AttrContext> env;
656
657 /** Visitor argument: the currently expected attribution result.
658 */
659 ResultInfo resultInfo;
660
661 /** Visitor result: the computed type.
662 */
663 Type result;
664
665 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
666
667 /** Visitor method: attribute a tree, catching any completion failure
668 * exceptions. Return the tree's type.
669 *
670 * @param tree The tree to be visited.
671 * @param env The environment visitor argument.
672 * @param resultInfo The result info visitor argument.
673 */
674 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
675 Env<AttrContext> prevEnv = this.env;
676 ResultInfo prevResult = this.resultInfo;
677 try {
678 this.env = env;
679 this.resultInfo = resultInfo;
680 if (resultInfo.needsArgumentAttr(tree)) {
681 result = argumentAttr.attribArg(tree, env);
682 } else {
683 tree.accept(this);
684 }
685 matchBindings = matchBindingsComputer.finishBindings(tree,
686 matchBindings);
687 if (tree == breakTree &&
688 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
689 breakTreeFound(copyEnv(env));
690 }
691 return result;
692 } catch (CompletionFailure ex) {
693 tree.type = syms.errType;
694 return chk.completionError(tree.pos(), ex);
695 } finally {
696 this.env = prevEnv;
697 this.resultInfo = prevResult;
698 }
699 }
700
701 protected void breakTreeFound(Env<AttrContext> env) {
702 throw new BreakAttr(env);
703 }
704
705 Env<AttrContext> copyEnv(Env<AttrContext> env) {
706 Env<AttrContext> newEnv =
707 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
708 if (newEnv.outer != null) {
709 newEnv.outer = copyEnv(newEnv.outer);
710 }
711 return newEnv;
712 }
713
714 WriteableScope copyScope(WriteableScope sc) {
715 WriteableScope newScope = WriteableScope.create(sc.owner);
716 List<Symbol> elemsList = List.nil();
717 for (Symbol sym : sc.getSymbols()) {
718 elemsList = elemsList.prepend(sym);
719 }
720 for (Symbol s : elemsList) {
721 newScope.enter(s);
722 }
723 return newScope;
724 }
725
726 /** Derived visitor method: attribute an expression tree.
727 */
728 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
729 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
730 }
731
732 /** Derived visitor method: attribute an expression tree with
733 * no constraints on the computed type.
734 */
735 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
736 return attribTree(tree, env, unknownExprInfo);
737 }
738
739 /** Derived visitor method: attribute a type tree.
740 */
741 public Type attribType(JCTree tree, Env<AttrContext> env) {
742 Type result = attribType(tree, env, Type.noType);
743 return result;
744 }
745
746 /** Derived visitor method: attribute a type tree.
747 */
748 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
749 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
750 return result;
751 }
752
753 /** Derived visitor method: attribute a statement or definition tree.
754 */
755 public Type attribStat(JCTree tree, Env<AttrContext> env) {
756 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
757 Type result = attribTree(tree, env, statInfo);
758 analyzer.analyzeIfNeeded(tree, analyzeEnv);
759 attrRecover.doRecovery();
760 return result;
761 }
762
763 /** Attribute a list of expressions, returning a list of types.
764 */
765 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
766 ListBuffer<Type> ts = new ListBuffer<>();
767 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
768 ts.append(attribExpr(l.head, env, pt));
769 return ts.toList();
770 }
771
772 /** Attribute a list of statements, returning nothing.
773 */
774 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
775 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
776 attribStat(l.head, env);
777 }
778
779 /** Attribute the arguments in a method call, returning the method kind.
780 */
781 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
782 KindSelector kind = initialKind;
783 for (JCExpression arg : trees) {
784 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
785 if (argtype.hasTag(DEFERRED)) {
786 kind = KindSelector.of(KindSelector.POLY, kind);
787 }
788 argtypes.append(argtype);
789 }
790 return kind;
791 }
792
793 /** Attribute a type argument list, returning a list of types.
794 * Caller is responsible for calling checkRefTypes.
795 */
796 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
797 ListBuffer<Type> argtypes = new ListBuffer<>();
798 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
799 argtypes.append(attribType(l.head, env));
800 return argtypes.toList();
801 }
802
803 /** Attribute a type argument list, returning a list of types.
804 * Check that all the types are references.
805 */
806 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
807 List<Type> types = attribAnyTypes(trees, env);
808 return chk.checkRefTypes(trees, types);
809 }
810
811 /**
812 * Attribute type variables (of generic classes or methods).
813 * Compound types are attributed later in attribBounds.
814 * @param typarams the type variables to enter
815 * @param env the current environment
816 */
817 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
818 for (JCTypeParameter tvar : typarams) {
819 TypeVar a = (TypeVar)tvar.type;
820 a.tsym.flags_field |= UNATTRIBUTED;
821 a.setUpperBound(Type.noType);
822 if (!tvar.bounds.isEmpty()) {
823 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
824 for (JCExpression bound : tvar.bounds.tail)
825 bounds = bounds.prepend(attribType(bound, env));
826 types.setBounds(a, bounds.reverse());
827 } else {
828 // if no bounds are given, assume a single bound of
829 // java.lang.Object.
830 types.setBounds(a, List.of(syms.objectType));
831 }
832 a.tsym.flags_field &= ~UNATTRIBUTED;
833 }
834 if (checkCyclic) {
835 for (JCTypeParameter tvar : typarams) {
836 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
837 }
838 }
839 }
840
841 /**
842 * Attribute the type references in a list of annotations.
843 */
844 void attribAnnotationTypes(List<JCAnnotation> annotations,
845 Env<AttrContext> env) {
846 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
847 JCAnnotation a = al.head;
848 attribType(a.annotationType, env);
849 }
850 }
851
852 /**
853 * Attribute a "lazy constant value".
854 * @param env The env for the const value
855 * @param variable The initializer for the const value
856 * @param type The expected type, or null
857 * @see VarSymbol#setLazyConstValue
858 */
859 public Object attribLazyConstantValue(Env<AttrContext> env,
860 Env<AttrContext> enclosingEnv,
861 JCVariableDecl variable,
862 Type type) {
863 deferredLintHandler.push(variable);
864 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
865 try {
866 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
867 Type itype = attribExpr(variable.init, env, type);
868 if (variable.isImplicitlyTyped()) {
869 //fixup local variable type
870 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
871 }
872 if (itype.constValue() != null) {
873 return coerce(itype, type).constValue();
874 } else {
875 return null;
876 }
877 } finally {
878 log.useSource(prevSource);
879 deferredLintHandler.pop();
880 }
881 }
882
883 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
884 * Supertypes of anonymous inner classes are usually already attributed.
885 *
886 * @param tree The tree making up the type reference.
887 * @param env The environment current at the reference.
888 * @param classExpected true if only a class is expected here.
889 * @param interfaceExpected true if only an interface is expected here.
890 */
891 Type attribBase(JCTree tree,
892 Env<AttrContext> env,
893 boolean classExpected,
894 boolean interfaceExpected,
895 boolean checkExtensible) {
896 Type t = tree.type != null ?
897 tree.type :
898 attribType(tree, env);
899 try {
900 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
901 } catch (CompletionFailure ex) {
902 chk.completionError(tree.pos(), ex);
903 return t;
904 }
905 }
906 Type checkBase(Type t,
907 JCTree tree,
908 Env<AttrContext> env,
909 boolean classExpected,
910 boolean interfaceExpected,
911 boolean checkExtensible) {
912 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
913 (((JCTypeApply) tree).clazz).pos() : tree.pos();
914 if (t.tsym.isAnonymous()) {
915 log.error(pos, Errors.CantInheritFromAnon);
916 return types.createErrorType(t);
917 }
918 if (t.isErroneous())
919 return t;
920 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
921 // check that type variable is already visible
922 if (t.getUpperBound() == null) {
923 log.error(pos, Errors.IllegalForwardRef);
924 return types.createErrorType(t);
925 }
926 } else {
927 t = chk.checkClassType(pos, t, checkExtensible);
928 }
929 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
930 log.error(pos, Errors.IntfExpectedHere);
931 // return errType is necessary since otherwise there might
932 // be undetected cycles which cause attribution to loop
933 return types.createErrorType(t);
934 } else if (checkExtensible &&
935 classExpected &&
936 (t.tsym.flags() & INTERFACE) != 0) {
937 log.error(pos, Errors.NoIntfExpectedHere);
938 return types.createErrorType(t);
939 }
940 if (checkExtensible &&
941 ((t.tsym.flags() & FINAL) != 0)) {
942 log.error(pos,
943 Errors.CantInheritFromFinal(t.tsym));
944 }
945 chk.checkNonCyclic(pos, t);
946 return t;
947 }
948
949 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
950 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
951 id.type = env.info.scope.owner.enclClass().type;
952 id.sym = env.info.scope.owner.enclClass();
953 return id.type;
954 }
955
956 public void visitClassDef(JCClassDecl tree) {
957 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
958 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
959 argumentAttr.withLocalCacheContext() : null);
960 boolean ctorProloguePrev = env.info.ctorPrologue;
961 try {
962 // Local and anonymous classes have not been entered yet, so we need to
963 // do it now.
964 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
965 enter.classEnter(tree, env);
966 } else {
967 // If this class declaration is part of a class level annotation,
968 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
969 // order to simplify later steps and allow for sensible error
970 // messages.
971 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
972 enter.classEnter(tree, env);
973 }
974
975 ClassSymbol c = tree.sym;
976 if (c == null) {
977 // exit in case something drastic went wrong during enter.
978 result = null;
979 } else {
980 // make sure class has been completed:
981 c.complete();
982
983 // If a class declaration appears in a constructor prologue,
984 // that means it's either a local class or an anonymous class.
985 // Either way, there is no immediately enclosing instance.
986 if (ctorProloguePrev) {
987 c.flags_field |= NOOUTERTHIS;
988 }
989 attribClass(tree.pos(), c);
990 result = tree.type = c.type;
991 }
992 } finally {
993 localCacheContext.ifPresent(LocalCacheContext::leave);
994 env.info.ctorPrologue = ctorProloguePrev;
995 }
996 }
997
998 public void visitMethodDef(JCMethodDecl tree) {
999 MethodSymbol m = tree.sym;
1000 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1001
1002 Lint lint = env.info.lint.augment(m);
1003 Lint prevLint = chk.setLint(lint);
1004 boolean ctorProloguePrev = env.info.ctorPrologue;
1005 Assert.check(!env.info.ctorPrologue);
1006 MethodSymbol prevMethod = chk.setMethod(m);
1007 try {
1008 deferredLintHandler.flush(tree, lint);
1009 chk.checkDeprecatedAnnotation(tree.pos(), m);
1010
1011
1012 // Create a new environment with local scope
1013 // for attributing the method.
1014 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1015 localEnv.info.lint = lint;
1016
1017 attribStats(tree.typarams, localEnv);
1018
1019 // If we override any other methods, check that we do so properly.
1020 // JLS ???
1021 if (m.isStatic()) {
1022 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1023 } else {
1024 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1025 }
1026 chk.checkOverride(env, tree, m);
1027
1028 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1029 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1030 }
1031
1032 // Enter all type parameters into the local method scope.
1033 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1034 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1035
1036 ClassSymbol owner = env.enclClass.sym;
1037 if ((owner.flags() & ANNOTATION) != 0 &&
1038 (tree.params.nonEmpty() ||
1039 tree.recvparam != null))
1040 log.error(tree.params.nonEmpty() ?
1041 tree.params.head.pos() :
1042 tree.recvparam.pos(),
1043 Errors.IntfAnnotationMembersCantHaveParams);
1044
1045 // Attribute all value parameters.
1046 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1047 attribStat(l.head, localEnv);
1048 }
1049
1050 chk.checkVarargsMethodDecl(localEnv, tree);
1051
1052 // Check that type parameters are well-formed.
1053 chk.validate(tree.typarams, localEnv);
1054
1055 // Check that result type is well-formed.
1056 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1057 chk.validate(tree.restype, localEnv);
1058
1059 // Check that receiver type is well-formed.
1060 if (tree.recvparam != null) {
1061 // Use a new environment to check the receiver parameter.
1062 // Otherwise I get "might not have been initialized" errors.
1063 // Is there a better way?
1064 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1065 attribType(tree.recvparam, newEnv);
1066 chk.validate(tree.recvparam, newEnv);
1067 }
1068
1069 // Is this method a constructor?
1070 boolean isConstructor = TreeInfo.isConstructor(tree);
1071
1072 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1073 // lets find if this method is an accessor
1074 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1075 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1076 if (recordComponent.isPresent()) {
1077 // the method is a user defined accessor lets check that everything is fine
1078 if (!tree.sym.isPublic()) {
1079 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1080 }
1081 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1082 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1083 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1084 }
1085 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1086 log.error(tree,
1087 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1088 }
1089 if (!tree.typarams.isEmpty()) {
1090 log.error(tree,
1091 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1092 }
1093 if (tree.sym.isStatic()) {
1094 log.error(tree,
1095 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1096 }
1097 }
1098
1099 if (isConstructor) {
1100 // if this a constructor other than the canonical one
1101 if ((tree.sym.flags_field & RECORD) == 0) {
1102 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1103 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1104 }
1105 } else {
1106 // but if it is the canonical:
1107
1108 /* if user generated, then it shouldn't:
1109 * - have an accessibility stricter than that of the record type
1110 * - explicitly invoke any other constructor
1111 */
1112 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1113 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1114 log.error(tree,
1115 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1116 Errors.InvalidCanonicalConstructorInRecord(
1117 Fragments.Canonical,
1118 env.enclClass.sym.name,
1119 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1120 ) :
1121 Errors.InvalidCanonicalConstructorInRecord(
1122 Fragments.Canonical,
1123 env.enclClass.sym.name,
1124 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1125 )
1126 );
1127 }
1128
1129 if (!allowValueClasses && TreeInfo.hasAnyConstructorCall(tree)) {
1130 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1131 Fragments.Canonical, env.enclClass.sym.name,
1132 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1133 }
1134 }
1135
1136 // also we want to check that no type variables have been defined
1137 if (!tree.typarams.isEmpty()) {
1138 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1139 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1140 }
1141
1142 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1143 * record components
1144 */
1145 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1146 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1147 for (JCVariableDecl param: tree.params) {
1148 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1149 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1150 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1151 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1152 Fragments.Canonical, env.enclClass.sym.name,
1153 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1154 }
1155 recordComponents = recordComponents.tail;
1156 recordFieldTypes = recordFieldTypes.tail;
1157 }
1158 }
1159 }
1160 }
1161
1162 // annotation method checks
1163 if ((owner.flags() & ANNOTATION) != 0) {
1164 // annotation method cannot have throws clause
1165 if (tree.thrown.nonEmpty()) {
1166 log.error(tree.thrown.head.pos(),
1167 Errors.ThrowsNotAllowedInIntfAnnotation);
1168 }
1169 // annotation method cannot declare type-parameters
1170 if (tree.typarams.nonEmpty()) {
1171 log.error(tree.typarams.head.pos(),
1172 Errors.IntfAnnotationMembersCantHaveTypeParams);
1173 }
1174 // validate annotation method's return type (could be an annotation type)
1175 chk.validateAnnotationType(tree.restype);
1176 // ensure that annotation method does not clash with members of Object/Annotation
1177 chk.validateAnnotationMethod(tree.pos(), m);
1178 }
1179
1180 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1181 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1182
1183 if (tree.body == null) {
1184 // Empty bodies are only allowed for
1185 // abstract, native, or interface methods, or for methods
1186 // in a retrofit signature class.
1187 if (tree.defaultValue != null) {
1188 if ((owner.flags() & ANNOTATION) == 0)
1189 log.error(tree.pos(),
1190 Errors.DefaultAllowedInIntfAnnotationMember);
1191 }
1192 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1193 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1194 } else {
1195 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1196 if ((owner.flags() & INTERFACE) != 0) {
1197 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1198 } else {
1199 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1200 }
1201 } else if ((tree.mods.flags & NATIVE) != 0) {
1202 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1203 }
1204 // Add an implicit super() call unless an explicit call to
1205 // super(...) or this(...) is given
1206 // or we are compiling class java.lang.Object.
1207 if (isConstructor && owner.type != syms.objectType) {
1208 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1209 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1210 make.Ident(names._super), make.Idents(List.nil())));
1211 if (allowValueClasses && (owner.isValueClass() || owner.hasStrict() || ((owner.flags_field & RECORD) != 0))) {
1212 tree.body.stats = tree.body.stats.append(supCall);
1213 } else {
1214 tree.body.stats = tree.body.stats.prepend(supCall);
1215 }
1216 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1217 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1218 TreeInfo.hasConstructorCall(tree, names._super)) {
1219 // enum constructors are not allowed to call super
1220 // directly, so make sure there aren't any super calls
1221 // in enum constructors, except in the compiler
1222 // generated one.
1223 log.error(tree.body.stats.head.pos(),
1224 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1225 }
1226 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1227 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1228 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1229 if (!initParamNames.equals(recordComponentNames)) {
1230 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1231 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1232 }
1233 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1234 log.error(tree,
1235 Errors.InvalidCanonicalConstructorInRecord(
1236 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1237 env.enclClass.sym.name,
1238 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1239 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1240 }
1241 }
1242 }
1243
1244 // Attribute all type annotations in the body
1245 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1246 annotate.flush();
1247
1248 // Start of constructor prologue
1249 localEnv.info.ctorPrologue = isConstructor;
1250
1251 // Attribute method body.
1252 attribStat(tree.body, localEnv);
1253 }
1254
1255 localEnv.info.scope.leave();
1256 result = tree.type = m.type;
1257 } finally {
1258 chk.setLint(prevLint);
1259 chk.setMethod(prevMethod);
1260 env.info.ctorPrologue = ctorProloguePrev;
1261 }
1262 }
1263
1264 public void visitVarDef(JCVariableDecl tree) {
1265 // Local variables have not been entered yet, so we need to do it now:
1266 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1267 if (tree.sym != null) {
1268 // parameters have already been entered
1269 env.info.scope.enter(tree.sym);
1270 } else {
1271 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1272 if (tree.init == null) {
1273 //cannot use 'var' without initializer
1274 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1275 tree.vartype = make.Erroneous();
1276 } else {
1277 Fragment msg = canInferLocalVarType(tree);
1278 if (msg != null) {
1279 //cannot use 'var' with initializer which require an explicit target
1280 //(e.g. lambda, method reference, array initializer).
1281 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1282 tree.vartype = make.Erroneous();
1283 }
1284 }
1285 }
1286 try {
1287 annotate.blockAnnotations();
1288 memberEnter.memberEnter(tree, env);
1289 } finally {
1290 annotate.unblockAnnotations();
1291 }
1292 }
1293 } else {
1294 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1295 }
1296
1297 VarSymbol v = tree.sym;
1298 Lint lint = env.info.lint.augment(v);
1299 Lint prevLint = chk.setLint(lint);
1300
1301 // Check that the variable's declared type is well-formed.
1302 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1303 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1304 (tree.sym.flags() & PARAMETER) != 0;
1305 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1306
1307 try {
1308 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1309 deferredLintHandler.flush(tree, lint);
1310 chk.checkDeprecatedAnnotation(tree.pos(), v);
1311
1312 if (tree.init != null) {
1313 if ((v.flags_field & FINAL) == 0 ||
1314 !memberEnter.needsLazyConstValue(tree.init)) {
1315 // Not a compile-time constant
1316 // Attribute initializer in a new environment
1317 // with the declared variable as owner.
1318 // Check that initializer conforms to variable's declared type.
1319 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1320 initEnv.info.lint = lint;
1321 // In order to catch self-references, we set the variable's
1322 // declaration position to maximal possible value, effectively
1323 // marking the variable as undefined.
1324 initEnv.info.enclVar = v;
1325 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1326 try {
1327 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1328 // strict instance initializer in a value class
1329 initEnv.info.ctorPrologue = true;
1330 }
1331 attribExpr(tree.init, initEnv, v.type);
1332 if (tree.isImplicitlyTyped()) {
1333 //fixup local variable type
1334 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1335 }
1336 } finally {
1337 initEnv.info.ctorPrologue = previousCtorPrologue;
1338 }
1339 }
1340 if (tree.isImplicitlyTyped()) {
1341 setSyntheticVariableType(tree, v.type);
1342 }
1343 }
1344 result = tree.type = v.type;
1345 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1346 if (isNonArgsMethodInObject(v.name)) {
1347 log.error(tree, Errors.IllegalRecordComponentName(v));
1348 }
1349 }
1350 }
1351 finally {
1352 chk.setLint(prevLint);
1353 }
1354 }
1355
1356 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1357 if (tree.init != null &&
1358 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1359 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1360 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1361 // Field initializer expression need to be entered.
1362 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree);
1363 annotate.flush();
1364 }
1365 }
1366
1367 private boolean isNonArgsMethodInObject(Name name) {
1368 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1369 if (s.type.getParameterTypes().isEmpty()) {
1370 return true;
1371 }
1372 }
1373 return false;
1374 }
1375
1376 Fragment canInferLocalVarType(JCVariableDecl tree) {
1377 LocalInitScanner lis = new LocalInitScanner();
1378 lis.scan(tree.init);
1379 return lis.badInferenceMsg;
1380 }
1381
1382 static class LocalInitScanner extends TreeScanner {
1383 Fragment badInferenceMsg = null;
1384 boolean needsTarget = true;
1385
1386 @Override
1387 public void visitNewArray(JCNewArray tree) {
1388 if (tree.elemtype == null && needsTarget) {
1389 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1390 }
1391 }
1392
1393 @Override
1394 public void visitLambda(JCLambda tree) {
1395 if (needsTarget) {
1396 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1397 }
1398 }
1399
1400 @Override
1401 public void visitTypeCast(JCTypeCast tree) {
1402 boolean prevNeedsTarget = needsTarget;
1403 try {
1404 needsTarget = false;
1405 super.visitTypeCast(tree);
1406 } finally {
1407 needsTarget = prevNeedsTarget;
1408 }
1409 }
1410
1411 @Override
1412 public void visitReference(JCMemberReference tree) {
1413 if (needsTarget) {
1414 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1415 }
1416 }
1417
1418 @Override
1419 public void visitNewClass(JCNewClass tree) {
1420 boolean prevNeedsTarget = needsTarget;
1421 try {
1422 needsTarget = false;
1423 super.visitNewClass(tree);
1424 } finally {
1425 needsTarget = prevNeedsTarget;
1426 }
1427 }
1428
1429 @Override
1430 public void visitApply(JCMethodInvocation tree) {
1431 boolean prevNeedsTarget = needsTarget;
1432 try {
1433 needsTarget = false;
1434 super.visitApply(tree);
1435 } finally {
1436 needsTarget = prevNeedsTarget;
1437 }
1438 }
1439 }
1440
1441 public void visitSkip(JCSkip tree) {
1442 result = null;
1443 }
1444
1445 public void visitBlock(JCBlock tree) {
1446 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1447 // Block is a static or instance initializer;
1448 // let the owner of the environment be a freshly
1449 // created BLOCK-method.
1450 Symbol fakeOwner =
1451 new MethodSymbol(tree.flags | BLOCK |
1452 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1453 env.info.scope.owner);
1454 final Env<AttrContext> localEnv =
1455 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1456
1457 if ((tree.flags & STATIC) != 0) {
1458 localEnv.info.staticLevel++;
1459 } else {
1460 localEnv.info.instanceInitializerBlock = true;
1461 }
1462 // Attribute all type annotations in the block
1463 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1464 annotate.flush();
1465 attribStats(tree.stats, localEnv);
1466
1467 {
1468 // Store init and clinit type annotations with the ClassSymbol
1469 // to allow output in Gen.normalizeDefs.
1470 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1471 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1472 if ((tree.flags & STATIC) != 0) {
1473 cs.appendClassInitTypeAttributes(tas);
1474 } else {
1475 cs.appendInitTypeAttributes(tas);
1476 }
1477 }
1478 } else {
1479 // Create a new local environment with a local scope.
1480 Env<AttrContext> localEnv =
1481 env.dup(tree, env.info.dup(env.info.scope.dup()));
1482 try {
1483 attribStats(tree.stats, localEnv);
1484 } finally {
1485 localEnv.info.scope.leave();
1486 }
1487 }
1488 result = null;
1489 }
1490
1491 public void visitDoLoop(JCDoWhileLoop tree) {
1492 attribStat(tree.body, env.dup(tree));
1493 attribExpr(tree.cond, env, syms.booleanType);
1494 handleLoopConditionBindings(matchBindings, tree, tree.body);
1495 result = null;
1496 }
1497
1498 public void visitWhileLoop(JCWhileLoop tree) {
1499 attribExpr(tree.cond, env, syms.booleanType);
1500 MatchBindings condBindings = matchBindings;
1501 // include condition's bindings when true in the body:
1502 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1503 try {
1504 attribStat(tree.body, whileEnv.dup(tree));
1505 } finally {
1506 whileEnv.info.scope.leave();
1507 }
1508 handleLoopConditionBindings(condBindings, tree, tree.body);
1509 result = null;
1510 }
1511
1512 public void visitForLoop(JCForLoop tree) {
1513 Env<AttrContext> loopEnv =
1514 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1515 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1516 try {
1517 attribStats(tree.init, loopEnv);
1518 if (tree.cond != null) {
1519 attribExpr(tree.cond, loopEnv, syms.booleanType);
1520 // include condition's bindings when true in the body and step:
1521 condBindings = matchBindings;
1522 }
1523 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1524 try {
1525 bodyEnv.tree = tree; // before, we were not in loop!
1526 attribStats(tree.step, bodyEnv);
1527 attribStat(tree.body, bodyEnv);
1528 } finally {
1529 bodyEnv.info.scope.leave();
1530 }
1531 result = null;
1532 }
1533 finally {
1534 loopEnv.info.scope.leave();
1535 }
1536 handleLoopConditionBindings(condBindings, tree, tree.body);
1537 }
1538
1539 /**
1540 * Include condition's bindings when false after the loop, if cannot get out of the loop
1541 */
1542 private void handleLoopConditionBindings(MatchBindings condBindings,
1543 JCStatement loop,
1544 JCStatement loopBody) {
1545 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1546 !breaksTo(env, loop, loopBody)) {
1547 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1548 }
1549 }
1550
1551 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1552 preFlow(body);
1553 return flow.breaksToTree(env, loop, body, make);
1554 }
1555
1556 /**
1557 * Add given bindings to the current scope, unless there's a break to
1558 * an immediately enclosing labeled statement.
1559 */
1560 private void addBindings2Scope(JCStatement introducingStatement,
1561 List<BindingSymbol> bindings) {
1562 if (bindings.isEmpty()) {
1563 return ;
1564 }
1565
1566 var searchEnv = env;
1567 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1568 labeled.body == introducingStatement) {
1569 if (breaksTo(env, labeled, labeled.body)) {
1570 //breaking to an immediately enclosing labeled statement
1571 return ;
1572 }
1573 searchEnv = searchEnv.next;
1574 introducingStatement = labeled;
1575 }
1576
1577 //include condition's body when false after the while, if cannot get out of the loop
1578 bindings.forEach(env.info.scope::enter);
1579 bindings.forEach(BindingSymbol::preserveBinding);
1580 }
1581
1582 public void visitForeachLoop(JCEnhancedForLoop tree) {
1583 Env<AttrContext> loopEnv =
1584 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1585 try {
1586 //the Formal Parameter of a for-each loop is not in the scope when
1587 //attributing the for-each expression; we mimic this by attributing
1588 //the for-each expression first (against original scope).
1589 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1590 chk.checkNonVoid(tree.pos(), exprType);
1591 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1592 if (elemtype == null) {
1593 // or perhaps expr implements Iterable<T>?
1594 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1595 if (base == null) {
1596 log.error(tree.expr.pos(),
1597 Errors.ForeachNotApplicableToType(exprType,
1598 Fragments.TypeReqArrayOrIterable));
1599 elemtype = types.createErrorType(exprType);
1600 } else {
1601 List<Type> iterableParams = base.allparams();
1602 elemtype = iterableParams.isEmpty()
1603 ? syms.objectType
1604 : types.wildUpperBound(iterableParams.head);
1605
1606 // Check the return type of the method iterator().
1607 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1608 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1609 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1610 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1611 log.error(tree.pos(),
1612 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1613 }
1614 }
1615 }
1616 if (tree.var.isImplicitlyTyped()) {
1617 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1618 setSyntheticVariableType(tree.var, inferredType);
1619 }
1620 attribStat(tree.var, loopEnv);
1621 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1622 loopEnv.tree = tree; // before, we were not in loop!
1623 attribStat(tree.body, loopEnv);
1624 result = null;
1625 }
1626 finally {
1627 loopEnv.info.scope.leave();
1628 }
1629 }
1630
1631 public void visitLabelled(JCLabeledStatement tree) {
1632 // Check that label is not used in an enclosing statement
1633 Env<AttrContext> env1 = env;
1634 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1635 if (env1.tree.hasTag(LABELLED) &&
1636 ((JCLabeledStatement) env1.tree).label == tree.label) {
1637 log.error(tree.pos(),
1638 Errors.LabelAlreadyInUse(tree.label));
1639 break;
1640 }
1641 env1 = env1.next;
1642 }
1643
1644 attribStat(tree.body, env.dup(tree));
1645 result = null;
1646 }
1647
1648 public void visitSwitch(JCSwitch tree) {
1649 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1650 attribStats(c.stats, caseEnv);
1651 });
1652 result = null;
1653 }
1654
1655 public void visitSwitchExpression(JCSwitchExpression tree) {
1656 boolean wrongContext = false;
1657
1658 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1659 PolyKind.STANDALONE : PolyKind.POLY;
1660
1661 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1662 //this means we are returning a poly conditional from void-compatible lambda expression
1663 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1664 resultInfo = recoveryInfo;
1665 wrongContext = true;
1666 }
1667
1668 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1669 unknownExprInfo :
1670 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1671
1672 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1673 ListBuffer<Type> caseTypes = new ListBuffer<>();
1674
1675 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1676 caseEnv.info.yieldResult = condInfo;
1677 attribStats(c.stats, caseEnv);
1678 new TreeScanner() {
1679 @Override
1680 public void visitYield(JCYield brk) {
1681 if (brk.target == tree) {
1682 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1683 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1684 }
1685 super.visitYield(brk);
1686 }
1687
1688 @Override public void visitClassDef(JCClassDecl tree) {}
1689 @Override public void visitLambda(JCLambda tree) {}
1690 }.scan(c.stats);
1691 });
1692
1693 if (tree.cases.isEmpty()) {
1694 log.error(tree.pos(),
1695 Errors.SwitchExpressionEmpty);
1696 } else if (caseTypes.isEmpty()) {
1697 log.error(tree.pos(),
1698 Errors.SwitchExpressionNoResultExpressions);
1699 }
1700
1701 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1702
1703 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1704 }
1705 //where:
1706 CheckContext switchExpressionContext(CheckContext checkContext) {
1707 return new Check.NestedCheckContext(checkContext) {
1708 //this will use enclosing check context to check compatibility of
1709 //subexpression against target type; if we are in a method check context,
1710 //depending on whether boxing is allowed, we could have incompatibilities
1711 @Override
1712 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1713 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1714 }
1715 };
1716 }
1717
1718 private void handleSwitch(JCTree switchTree,
1719 JCExpression selector,
1720 List<JCCase> cases,
1721 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1722 Type seltype = attribExpr(selector, env);
1723
1724 Env<AttrContext> switchEnv =
1725 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1726
1727 try {
1728 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1729 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1730 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1731 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1732 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1733 boolean patternSwitch;
1734 if (seltype.isPrimitive() && !intSwitch) {
1735 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1736 patternSwitch = true;
1737 }
1738 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1739 !intSwitch) {
1740 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1741 patternSwitch = true;
1742 } else {
1743 patternSwitch = cases.stream()
1744 .flatMap(c -> c.labels.stream())
1745 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1746 TreeInfo.isNullCaseLabel(l));
1747 }
1748
1749 // Attribute all cases and
1750 // check that there are no duplicate case labels or default clauses.
1751 Set<Object> constants = new HashSet<>(); // The set of case constants.
1752 boolean hasDefault = false; // Is there a default label?
1753 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1754 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1755 boolean hasNullPattern = false; // Is there a null pattern?
1756 CaseTree.CaseKind caseKind = null;
1757 boolean wasError = false;
1758 JCCaseLabel unconditionalCaseLabel = null;
1759 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1760 JCCase c = l.head;
1761 if (caseKind == null) {
1762 caseKind = c.caseKind;
1763 } else if (caseKind != c.caseKind && !wasError) {
1764 log.error(c.pos(),
1765 Errors.SwitchMixingCaseTypes);
1766 wasError = true;
1767 }
1768 MatchBindings currentBindings = null;
1769 MatchBindings guardBindings = null;
1770 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1771 JCCaseLabel label = labels.head;
1772 if (label instanceof JCConstantCaseLabel constLabel) {
1773 JCExpression expr = constLabel.expr;
1774 if (TreeInfo.isNull(expr)) {
1775 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1776 if (hasNullPattern) {
1777 log.error(label.pos(), Errors.DuplicateCaseLabel);
1778 }
1779 hasNullPattern = true;
1780 attribExpr(expr, switchEnv, seltype);
1781 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1782 } else if (enumSwitch) {
1783 Symbol sym = enumConstant(expr, seltype);
1784 if (sym == null) {
1785 if (allowPatternSwitch) {
1786 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1787 Symbol enumSym = TreeInfo.symbol(expr);
1788 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1789 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1790 } else if (!constants.add(enumSym)) {
1791 log.error(label.pos(), Errors.DuplicateCaseLabel);
1792 }
1793 } else {
1794 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1795 }
1796 } else if (!constants.add(sym)) {
1797 log.error(label.pos(), Errors.DuplicateCaseLabel);
1798 }
1799 } else if (errorEnumSwitch) {
1800 //error recovery: the selector is erroneous, and all the case labels
1801 //are identifiers. This could be an enum switch - don't report resolve
1802 //error for the case label:
1803 var prevResolveHelper = rs.basicLogResolveHelper;
1804 try {
1805 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1806 attribExpr(expr, switchEnv, seltype);
1807 } finally {
1808 rs.basicLogResolveHelper = prevResolveHelper;
1809 }
1810 } else {
1811 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1812 if (!pattype.hasTag(ERROR)) {
1813 if (pattype.constValue() == null) {
1814 Symbol s = TreeInfo.symbol(expr);
1815 if (s != null && s.kind == TYP) {
1816 log.error(expr.pos(),
1817 Errors.PatternExpected);
1818 } else if (s == null || !s.isEnum()) {
1819 log.error(expr.pos(),
1820 (stringSwitch ? Errors.StringConstReq
1821 : intSwitch ? Errors.ConstExprReq
1822 : Errors.PatternOrEnumReq));
1823 } else if (!constants.add(s)) {
1824 log.error(label.pos(), Errors.DuplicateCaseLabel);
1825 }
1826 }
1827 else {
1828 if (!stringSwitch && !intSwitch &&
1829 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1830 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1831 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1832 } else if (!constants.add(pattype.constValue())) {
1833 log.error(c.pos(), Errors.DuplicateCaseLabel);
1834 }
1835 }
1836 }
1837 }
1838 } else if (label instanceof JCDefaultCaseLabel def) {
1839 if (hasDefault) {
1840 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1841 } else if (hasUnconditionalPattern) {
1842 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1843 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1844 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1845 }
1846 hasDefault = true;
1847 matchBindings = MatchBindingsComputer.EMPTY;
1848 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1849 //pattern
1850 JCPattern pat = patternlabel.pat;
1851 attribExpr(pat, switchEnv, seltype);
1852 Type primaryType = TreeInfo.primaryPatternType(pat);
1853
1854 if (primaryType.isPrimitive()) {
1855 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1856 } else if (!primaryType.hasTag(TYPEVAR)) {
1857 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1858 }
1859 checkCastablePattern(pat.pos(), seltype, primaryType);
1860 Type patternType = types.erasure(primaryType);
1861 JCExpression guard = c.guard;
1862 if (guardBindings == null && guard != null) {
1863 MatchBindings afterPattern = matchBindings;
1864 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1865 try {
1866 attribExpr(guard, bodyEnv, syms.booleanType);
1867 } finally {
1868 bodyEnv.info.scope.leave();
1869 }
1870
1871 guardBindings = matchBindings;
1872 matchBindings = afterPattern;
1873
1874 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1875 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1876 }
1877 }
1878 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1879 boolean unconditional =
1880 unguarded &&
1881 !patternType.isErroneous() &&
1882 types.isUnconditionallyExact(seltype, patternType);
1883 if (unconditional) {
1884 if (hasUnconditionalPattern) {
1885 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1886 } else if (hasDefault) {
1887 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1888 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1889 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1890 }
1891 hasUnconditionalPattern = true;
1892 unconditionalCaseLabel = label;
1893 }
1894 lastPatternErroneous = patternType.isErroneous();
1895 } else {
1896 Assert.error();
1897 }
1898 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1899 }
1900
1901 if (guardBindings != null) {
1902 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1903 }
1904
1905 Env<AttrContext> caseEnv =
1906 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1907 try {
1908 attribCase.accept(c, caseEnv);
1909 } finally {
1910 caseEnv.info.scope.leave();
1911 }
1912 addVars(c.stats, switchEnv.info.scope);
1913
1914 preFlow(c);
1915 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1916 }
1917 if (patternSwitch) {
1918 chk.checkSwitchCaseStructure(cases);
1919 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1920 }
1921 if (switchTree.hasTag(SWITCH)) {
1922 ((JCSwitch) switchTree).hasUnconditionalPattern =
1923 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1924 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1925 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1926 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1927 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1928 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1929 } else {
1930 Assert.error(switchTree.getTag().name());
1931 }
1932 } finally {
1933 switchEnv.info.scope.leave();
1934 }
1935 }
1936 // where
1937 private ResultInfo caseLabelResultInfo(Type seltype) {
1938 return new ResultInfo(KindSelector.VAL_TYP,
1939 !seltype.hasTag(ERROR) ? seltype
1940 : Type.noType);
1941 }
1942 /** Add any variables defined in stats to the switch scope. */
1943 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1944 for (;stats.nonEmpty(); stats = stats.tail) {
1945 JCTree stat = stats.head;
1946 if (stat.hasTag(VARDEF))
1947 switchScope.enter(((JCVariableDecl) stat).sym);
1948 }
1949 }
1950 // where
1951 /** Return the selected enumeration constant symbol, or null. */
1952 private Symbol enumConstant(JCTree tree, Type enumType) {
1953 if (tree.hasTag(IDENT)) {
1954 JCIdent ident = (JCIdent)tree;
1955 Name name = ident.name;
1956 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1957 if (sym.kind == VAR) {
1958 Symbol s = ident.sym = sym;
1959 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1960 ident.type = s.type;
1961 return ((s.flags_field & Flags.ENUM) == 0)
1962 ? null : s;
1963 }
1964 }
1965 }
1966 return null;
1967 }
1968
1969 public void visitSynchronized(JCSynchronized tree) {
1970 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1971 if (identityType && isValueBased(tree.lock.type)) {
1972 env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1973 }
1974 attribStat(tree.body, env);
1975 result = null;
1976 }
1977 // where
1978 private boolean isValueBased(Type t) {
1979 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1980 }
1981
1982 public void visitTry(JCTry tree) {
1983 // Create a new local environment with a local
1984 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1985 try {
1986 boolean isTryWithResource = tree.resources.nonEmpty();
1987 // Create a nested environment for attributing the try block if needed
1988 Env<AttrContext> tryEnv = isTryWithResource ?
1989 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1990 localEnv;
1991 try {
1992 // Attribute resource declarations
1993 for (JCTree resource : tree.resources) {
1994 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1995 @Override
1996 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1997 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1998 }
1999 };
2000 ResultInfo twrResult =
2001 new ResultInfo(KindSelector.VAR,
2002 syms.autoCloseableType,
2003 twrContext);
2004 if (resource.hasTag(VARDEF)) {
2005 attribStat(resource, tryEnv);
2006 twrResult.check(resource, resource.type);
2007
2008 //check that resource type cannot throw InterruptedException
2009 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2010
2011 VarSymbol var = ((JCVariableDecl) resource).sym;
2012
2013 var.flags_field |= Flags.FINAL;
2014 var.setData(ElementKind.RESOURCE_VARIABLE);
2015 } else {
2016 attribTree(resource, tryEnv, twrResult);
2017 }
2018 }
2019 // Attribute body
2020 attribStat(tree.body, tryEnv);
2021 } finally {
2022 if (isTryWithResource)
2023 tryEnv.info.scope.leave();
2024 }
2025
2026 // Attribute catch clauses
2027 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2028 JCCatch c = l.head;
2029 Env<AttrContext> catchEnv =
2030 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2031 try {
2032 Type ctype = attribStat(c.param, catchEnv);
2033 if (TreeInfo.isMultiCatch(c)) {
2034 //multi-catch parameter is implicitly marked as final
2035 c.param.sym.flags_field |= FINAL | UNION;
2036 }
2037 if (c.param.sym.kind == VAR) {
2038 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2039 }
2040 chk.checkType(c.param.vartype.pos(),
2041 chk.checkClassType(c.param.vartype.pos(), ctype),
2042 syms.throwableType);
2043 attribStat(c.body, catchEnv);
2044 } finally {
2045 catchEnv.info.scope.leave();
2046 }
2047 }
2048
2049 // Attribute finalizer
2050 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2051 result = null;
2052 }
2053 finally {
2054 localEnv.info.scope.leave();
2055 }
2056 }
2057
2058 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2059 if (!resource.isErroneous() &&
2060 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2061 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2062 Symbol close = syms.noSymbol;
2063 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2064 try {
2065 close = rs.resolveQualifiedMethod(pos,
2066 env,
2067 types.skipTypeVars(resource, false),
2068 names.close,
2069 List.nil(),
2070 List.nil());
2071 }
2072 finally {
2073 log.popDiagnosticHandler(discardHandler);
2074 }
2075 if (close.kind == MTH &&
2076 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2077 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2078 env.info.lint.logIfEnabled(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2079 }
2080 }
2081 }
2082
2083 public void visitConditional(JCConditional tree) {
2084 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2085 MatchBindings condBindings = matchBindings;
2086
2087 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2088 isBooleanOrNumeric(env, tree)) ?
2089 PolyKind.STANDALONE : PolyKind.POLY;
2090
2091 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2092 //this means we are returning a poly conditional from void-compatible lambda expression
2093 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2094 result = tree.type = types.createErrorType(resultInfo.pt);
2095 return;
2096 }
2097
2098 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2099 unknownExprInfo :
2100 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2101
2102
2103 // x ? y : z
2104 // include x's bindings when true in y
2105 // include x's bindings when false in z
2106
2107 Type truetype;
2108 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2109 try {
2110 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2111 } finally {
2112 trueEnv.info.scope.leave();
2113 }
2114
2115 MatchBindings trueBindings = matchBindings;
2116
2117 Type falsetype;
2118 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2119 try {
2120 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2121 } finally {
2122 falseEnv.info.scope.leave();
2123 }
2124
2125 MatchBindings falseBindings = matchBindings;
2126
2127 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2128 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2129 List.of(truetype, falsetype)) : pt();
2130 if (condtype.constValue() != null &&
2131 truetype.constValue() != null &&
2132 falsetype.constValue() != null &&
2133 !owntype.hasTag(NONE)) {
2134 //constant folding
2135 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2136 }
2137 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2138 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2139 }
2140 //where
2141 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2142 switch (tree.getTag()) {
2143 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2144 ((JCLiteral)tree).typetag == BOOLEAN ||
2145 ((JCLiteral)tree).typetag == BOT;
2146 case LAMBDA: case REFERENCE: return false;
2147 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2148 case CONDEXPR:
2149 JCConditional condTree = (JCConditional)tree;
2150 return isBooleanOrNumeric(env, condTree.truepart) &&
2151 isBooleanOrNumeric(env, condTree.falsepart);
2152 case APPLY:
2153 JCMethodInvocation speculativeMethodTree =
2154 (JCMethodInvocation)deferredAttr.attribSpeculative(
2155 tree, env, unknownExprInfo,
2156 argumentAttr.withLocalCacheContext());
2157 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2158 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2159 env.enclClass.type :
2160 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2161 Type owntype = types.memberType(receiverType, msym).getReturnType();
2162 return primitiveOrBoxed(owntype);
2163 case NEWCLASS:
2164 JCExpression className =
2165 removeClassParams.translate(((JCNewClass)tree).clazz);
2166 JCExpression speculativeNewClassTree =
2167 (JCExpression)deferredAttr.attribSpeculative(
2168 className, env, unknownTypeInfo,
2169 argumentAttr.withLocalCacheContext());
2170 return primitiveOrBoxed(speculativeNewClassTree.type);
2171 default:
2172 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2173 argumentAttr.withLocalCacheContext()).type;
2174 return primitiveOrBoxed(speculativeType);
2175 }
2176 }
2177 //where
2178 boolean primitiveOrBoxed(Type t) {
2179 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2180 }
2181
2182 TreeTranslator removeClassParams = new TreeTranslator() {
2183 @Override
2184 public void visitTypeApply(JCTypeApply tree) {
2185 result = translate(tree.clazz);
2186 }
2187 };
2188
2189 CheckContext conditionalContext(CheckContext checkContext) {
2190 return new Check.NestedCheckContext(checkContext) {
2191 //this will use enclosing check context to check compatibility of
2192 //subexpression against target type; if we are in a method check context,
2193 //depending on whether boxing is allowed, we could have incompatibilities
2194 @Override
2195 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2196 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2197 }
2198 };
2199 }
2200
2201 /** Compute the type of a conditional expression, after
2202 * checking that it exists. See JLS 15.25. Does not take into
2203 * account the special case where condition and both arms
2204 * are constants.
2205 *
2206 * @param pos The source position to be used for error
2207 * diagnostics.
2208 * @param thentype The type of the expression's then-part.
2209 * @param elsetype The type of the expression's else-part.
2210 */
2211 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2212 if (condTypes.isEmpty()) {
2213 return syms.objectType; //TODO: how to handle?
2214 }
2215 Type first = condTypes.head;
2216 // If same type, that is the result
2217 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2218 return first.baseType();
2219
2220 List<Type> unboxedTypes = condTypes.stream()
2221 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2222 .collect(List.collector());
2223
2224 // Otherwise, if both arms can be converted to a numeric
2225 // type, return the least numeric type that fits both arms
2226 // (i.e. return larger of the two, or return int if one
2227 // arm is short, the other is char).
2228 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2229 // If one arm has an integer subrange type (i.e., byte,
2230 // short, or char), and the other is an integer constant
2231 // that fits into the subrange, return the subrange type.
2232 for (Type type : unboxedTypes) {
2233 if (!type.getTag().isStrictSubRangeOf(INT)) {
2234 continue;
2235 }
2236 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2237 return type.baseType();
2238 }
2239
2240 for (TypeTag tag : primitiveTags) {
2241 Type candidate = syms.typeOfTag[tag.ordinal()];
2242 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2243 return candidate;
2244 }
2245 }
2246 }
2247
2248 // Those were all the cases that could result in a primitive
2249 condTypes = condTypes.stream()
2250 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2251 .collect(List.collector());
2252
2253 for (Type type : condTypes) {
2254 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2255 return type.baseType();
2256 }
2257
2258 Iterator<DiagnosticPosition> posIt = positions.iterator();
2259
2260 condTypes = condTypes.stream()
2261 .map(t -> chk.checkNonVoid(posIt.next(), t))
2262 .collect(List.collector());
2263
2264 // both are known to be reference types. The result is
2265 // lub(thentype,elsetype). This cannot fail, as it will
2266 // always be possible to infer "Object" if nothing better.
2267 return types.lub(condTypes.stream()
2268 .map(t -> t.baseType())
2269 .filter(t -> !t.hasTag(BOT))
2270 .collect(List.collector()));
2271 }
2272
2273 static final TypeTag[] primitiveTags = new TypeTag[]{
2274 BYTE,
2275 CHAR,
2276 SHORT,
2277 INT,
2278 LONG,
2279 FLOAT,
2280 DOUBLE,
2281 BOOLEAN,
2282 };
2283
2284 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2285 return bindingEnv(env, env.tree, bindings);
2286 }
2287
2288 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2289 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2290 bindings.forEach(env1.info.scope::enter);
2291 return env1;
2292 }
2293
2294 public void visitIf(JCIf tree) {
2295 attribExpr(tree.cond, env, syms.booleanType);
2296
2297 // if (x) { y } [ else z ]
2298 // include x's bindings when true in y
2299 // include x's bindings when false in z
2300
2301 MatchBindings condBindings = matchBindings;
2302 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2303
2304 try {
2305 attribStat(tree.thenpart, thenEnv);
2306 } finally {
2307 thenEnv.info.scope.leave();
2308 }
2309
2310 preFlow(tree.thenpart);
2311 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2312 boolean aliveAfterElse;
2313
2314 if (tree.elsepart != null) {
2315 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2316 try {
2317 attribStat(tree.elsepart, elseEnv);
2318 } finally {
2319 elseEnv.info.scope.leave();
2320 }
2321 preFlow(tree.elsepart);
2322 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2323 } else {
2324 aliveAfterElse = true;
2325 }
2326
2327 chk.checkEmptyIf(tree);
2328
2329 List<BindingSymbol> afterIfBindings = List.nil();
2330
2331 if (aliveAfterThen && !aliveAfterElse) {
2332 afterIfBindings = condBindings.bindingsWhenTrue;
2333 } else if (aliveAfterElse && !aliveAfterThen) {
2334 afterIfBindings = condBindings.bindingsWhenFalse;
2335 }
2336
2337 addBindings2Scope(tree, afterIfBindings);
2338
2339 result = null;
2340 }
2341
2342 void preFlow(JCTree tree) {
2343 attrRecover.doRecovery();
2344 new PostAttrAnalyzer() {
2345 @Override
2346 public void scan(JCTree tree) {
2347 if (tree == null ||
2348 (tree.type != null &&
2349 tree.type == Type.stuckType)) {
2350 //don't touch stuck expressions!
2351 return;
2352 }
2353 super.scan(tree);
2354 }
2355
2356 @Override
2357 public void visitClassDef(JCClassDecl that) {
2358 if (that.sym != null) {
2359 // Method preFlow shouldn't visit class definitions
2360 // that have not been entered and attributed.
2361 // See JDK-8254557 and JDK-8203277 for more details.
2362 super.visitClassDef(that);
2363 }
2364 }
2365
2366 @Override
2367 public void visitLambda(JCLambda that) {
2368 if (that.type != null) {
2369 // Method preFlow shouldn't visit lambda expressions
2370 // that have not been entered and attributed.
2371 // See JDK-8254557 and JDK-8203277 for more details.
2372 super.visitLambda(that);
2373 }
2374 }
2375 }.scan(tree);
2376 }
2377
2378 public void visitExec(JCExpressionStatement tree) {
2379 //a fresh environment is required for 292 inference to work properly ---
2380 //see Infer.instantiatePolymorphicSignatureInstance()
2381 Env<AttrContext> localEnv = env.dup(tree);
2382 attribExpr(tree.expr, localEnv);
2383 result = null;
2384 }
2385
2386 public void visitBreak(JCBreak tree) {
2387 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2388 result = null;
2389 }
2390
2391 public void visitYield(JCYield tree) {
2392 if (env.info.yieldResult != null) {
2393 attribTree(tree.value, env, env.info.yieldResult);
2394 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2395 } else {
2396 log.error(tree.pos(), tree.value.hasTag(PARENS)
2397 ? Errors.NoSwitchExpressionQualify
2398 : Errors.NoSwitchExpression);
2399 attribTree(tree.value, env, unknownExprInfo);
2400 }
2401 result = null;
2402 }
2403
2404 public void visitContinue(JCContinue tree) {
2405 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2406 result = null;
2407 }
2408 //where
2409 /** Return the target of a break, continue or yield statement,
2410 * if it exists, report an error if not.
2411 * Note: The target of a labelled break or continue is the
2412 * (non-labelled) statement tree referred to by the label,
2413 * not the tree representing the labelled statement itself.
2414 *
2415 * @param pos The position to be used for error diagnostics
2416 * @param tag The tag of the jump statement. This is either
2417 * Tree.BREAK or Tree.CONTINUE.
2418 * @param label The label of the jump statement, or null if no
2419 * label is given.
2420 * @param env The environment current at the jump statement.
2421 */
2422 private JCTree findJumpTarget(DiagnosticPosition pos,
2423 JCTree.Tag tag,
2424 Name label,
2425 Env<AttrContext> env) {
2426 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2427
2428 if (jumpTarget.snd != null) {
2429 log.error(pos, jumpTarget.snd);
2430 }
2431
2432 return jumpTarget.fst;
2433 }
2434 /** Return the target of a break or continue statement, if it exists,
2435 * report an error if not.
2436 * Note: The target of a labelled break or continue is the
2437 * (non-labelled) statement tree referred to by the label,
2438 * not the tree representing the labelled statement itself.
2439 *
2440 * @param tag The tag of the jump statement. This is either
2441 * Tree.BREAK or Tree.CONTINUE.
2442 * @param label The label of the jump statement, or null if no
2443 * label is given.
2444 * @param env The environment current at the jump statement.
2445 */
2446 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2447 Name label,
2448 Env<AttrContext> env) {
2449 // Search environments outwards from the point of jump.
2450 Env<AttrContext> env1 = env;
2451 JCDiagnostic.Error pendingError = null;
2452 LOOP:
2453 while (env1 != null) {
2454 switch (env1.tree.getTag()) {
2455 case LABELLED:
2456 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2457 if (label == labelled.label) {
2458 // If jump is a continue, check that target is a loop.
2459 if (tag == CONTINUE) {
2460 if (!labelled.body.hasTag(DOLOOP) &&
2461 !labelled.body.hasTag(WHILELOOP) &&
2462 !labelled.body.hasTag(FORLOOP) &&
2463 !labelled.body.hasTag(FOREACHLOOP)) {
2464 pendingError = Errors.NotLoopLabel(label);
2465 }
2466 // Found labelled statement target, now go inwards
2467 // to next non-labelled tree.
2468 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2469 } else {
2470 return Pair.of(labelled, pendingError);
2471 }
2472 }
2473 break;
2474 case DOLOOP:
2475 case WHILELOOP:
2476 case FORLOOP:
2477 case FOREACHLOOP:
2478 if (label == null) return Pair.of(env1.tree, pendingError);
2479 break;
2480 case SWITCH:
2481 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2482 break;
2483 case SWITCH_EXPRESSION:
2484 if (tag == YIELD) {
2485 return Pair.of(env1.tree, null);
2486 } else if (tag == BREAK) {
2487 pendingError = Errors.BreakOutsideSwitchExpression;
2488 } else {
2489 pendingError = Errors.ContinueOutsideSwitchExpression;
2490 }
2491 break;
2492 case LAMBDA:
2493 case METHODDEF:
2494 case CLASSDEF:
2495 break LOOP;
2496 default:
2497 }
2498 env1 = env1.next;
2499 }
2500 if (label != null)
2501 return Pair.of(null, Errors.UndefLabel(label));
2502 else if (pendingError != null)
2503 return Pair.of(null, pendingError);
2504 else if (tag == CONTINUE)
2505 return Pair.of(null, Errors.ContOutsideLoop);
2506 else
2507 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2508 }
2509
2510 public void visitReturn(JCReturn tree) {
2511 // Check that there is an enclosing method which is
2512 // nested within than the enclosing class.
2513 if (env.info.returnResult == null) {
2514 log.error(tree.pos(), Errors.RetOutsideMeth);
2515 } else if (env.info.yieldResult != null) {
2516 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2517 if (tree.expr != null) {
2518 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2519 }
2520 } else if (!env.info.isLambda &&
2521 env.enclMethod != null &&
2522 TreeInfo.isCompactConstructor(env.enclMethod)) {
2523 log.error(env.enclMethod,
2524 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2525 } else {
2526 // Attribute return expression, if it exists, and check that
2527 // it conforms to result type of enclosing method.
2528 if (tree.expr != null) {
2529 if (env.info.returnResult.pt.hasTag(VOID)) {
2530 env.info.returnResult.checkContext.report(tree.expr.pos(),
2531 diags.fragment(Fragments.UnexpectedRetVal));
2532 }
2533 attribTree(tree.expr, env, env.info.returnResult);
2534 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2535 !env.info.returnResult.pt.hasTag(NONE)) {
2536 env.info.returnResult.checkContext.report(tree.pos(),
2537 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2538 }
2539 }
2540 result = null;
2541 }
2542
2543 public void visitThrow(JCThrow tree) {
2544 Type owntype = attribExpr(tree.expr, env, Type.noType);
2545 chk.checkType(tree, owntype, syms.throwableType);
2546 result = null;
2547 }
2548
2549 public void visitAssert(JCAssert tree) {
2550 attribExpr(tree.cond, env, syms.booleanType);
2551 if (tree.detail != null) {
2552 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2553 }
2554 result = null;
2555 }
2556
2557 /** Visitor method for method invocations.
2558 * NOTE: The method part of an application will have in its type field
2559 * the return type of the method, not the method's type itself!
2560 */
2561 public void visitApply(JCMethodInvocation tree) {
2562 // The local environment of a method application is
2563 // a new environment nested in the current one.
2564 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2565
2566 // The types of the actual method arguments.
2567 List<Type> argtypes;
2568
2569 // The types of the actual method type arguments.
2570 List<Type> typeargtypes = null;
2571
2572 Name methName = TreeInfo.name(tree.meth);
2573
2574 boolean isConstructorCall =
2575 methName == names._this || methName == names._super;
2576
2577 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2578 if (isConstructorCall) {
2579
2580 // Attribute arguments, yielding list of argument types.
2581 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2582 argtypes = argtypesBuf.toList();
2583 typeargtypes = attribTypes(tree.typeargs, localEnv);
2584
2585 // Done with this()/super() parameters. End of constructor prologue.
2586 env.info.ctorPrologue = false;
2587
2588 // Variable `site' points to the class in which the called
2589 // constructor is defined.
2590 Type site = env.enclClass.sym.type;
2591 if (methName == names._super) {
2592 if (site == syms.objectType) {
2593 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2594 site = types.createErrorType(syms.objectType);
2595 } else {
2596 site = types.supertype(site);
2597 }
2598 }
2599
2600 if (site.hasTag(CLASS)) {
2601 Type encl = site.getEnclosingType();
2602 while (encl != null && encl.hasTag(TYPEVAR))
2603 encl = encl.getUpperBound();
2604 if (encl.hasTag(CLASS)) {
2605 // we are calling a nested class
2606
2607 if (tree.meth.hasTag(SELECT)) {
2608 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2609
2610 // We are seeing a prefixed call, of the form
2611 // <expr>.super(...).
2612 // Check that the prefix expression conforms
2613 // to the outer instance type of the class.
2614 chk.checkRefType(qualifier.pos(),
2615 attribExpr(qualifier, localEnv,
2616 encl));
2617 }
2618 } else if (tree.meth.hasTag(SELECT)) {
2619 log.error(tree.meth.pos(),
2620 Errors.IllegalQualNotIcls(site.tsym));
2621 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2622 }
2623
2624 if (tree.meth.hasTag(IDENT)) {
2625 // non-qualified super(...) call; check whether explicit constructor
2626 // invocation is well-formed. If the super class is an inner class,
2627 // make sure that an appropriate implicit qualifier exists. If the super
2628 // class is a local class, make sure that the current class is defined
2629 // in the same context as the local class.
2630 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2631 }
2632
2633 // if we're calling a java.lang.Enum constructor,
2634 // prefix the implicit String and int parameters
2635 if (site.tsym == syms.enumSym)
2636 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2637
2638 // Resolve the called constructor under the assumption
2639 // that we are referring to a superclass instance of the
2640 // current instance (JLS ???).
2641 boolean selectSuperPrev = localEnv.info.selectSuper;
2642 localEnv.info.selectSuper = true;
2643 localEnv.info.pendingResolutionPhase = null;
2644 Symbol sym = rs.resolveConstructor(
2645 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2646 localEnv.info.selectSuper = selectSuperPrev;
2647
2648 // Set method symbol to resolved constructor...
2649 TreeInfo.setSymbol(tree.meth, sym);
2650
2651 // ...and check that it is legal in the current context.
2652 // (this will also set the tree's type)
2653 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2654 checkId(tree.meth, site, sym, localEnv,
2655 new ResultInfo(kind, mpt));
2656 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2657 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2658 }
2659 // Otherwise, `site' is an error type and we do nothing
2660 result = tree.type = syms.voidType;
2661 } else {
2662 // Otherwise, we are seeing a regular method call.
2663 // Attribute the arguments, yielding list of argument types, ...
2664 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2665 argtypes = argtypesBuf.toList();
2666 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2667
2668 // ... and attribute the method using as a prototype a methodtype
2669 // whose formal argument types is exactly the list of actual
2670 // arguments (this will also set the method symbol).
2671 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2672 localEnv.info.pendingResolutionPhase = null;
2673 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2674
2675 // Compute the result type.
2676 Type restype = mtype.getReturnType();
2677 if (restype.hasTag(WILDCARD))
2678 throw new AssertionError(mtype);
2679
2680 Type qualifier = (tree.meth.hasTag(SELECT))
2681 ? ((JCFieldAccess) tree.meth).selected.type
2682 : env.enclClass.sym.type;
2683 Symbol msym = TreeInfo.symbol(tree.meth);
2684 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2685
2686 chk.checkRefTypes(tree.typeargs, typeargtypes);
2687
2688 // Check that value of resulting type is admissible in the
2689 // current context. Also, capture the return type
2690 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2691 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2692 }
2693 chk.validate(tree.typeargs, localEnv);
2694 }
2695 //where
2696 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2697 if (msym != null &&
2698 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2699 methodName == names.getClass &&
2700 argtypes.isEmpty()) {
2701 // as a special case, x.getClass() has type Class<? extends |X|>
2702 return new ClassType(restype.getEnclosingType(),
2703 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2704 BoundKind.EXTENDS,
2705 syms.boundClass)),
2706 restype.tsym,
2707 restype.getMetadata());
2708 } else if (msym != null &&
2709 msym.owner == syms.arrayClass &&
2710 methodName == names.clone &&
2711 types.isArray(qualifierType)) {
2712 // as a special case, array.clone() has a result that is
2713 // the same as static type of the array being cloned
2714 return qualifierType;
2715 } else {
2716 return restype;
2717 }
2718 }
2719
2720 /** Obtain a method type with given argument types.
2721 */
2722 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2723 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2724 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2725 }
2726
2727 public void visitNewClass(final JCNewClass tree) {
2728 Type owntype = types.createErrorType(tree.type);
2729
2730 // The local environment of a class creation is
2731 // a new environment nested in the current one.
2732 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2733
2734 // The anonymous inner class definition of the new expression,
2735 // if one is defined by it.
2736 JCClassDecl cdef = tree.def;
2737
2738 // If enclosing class is given, attribute it, and
2739 // complete class name to be fully qualified
2740 JCExpression clazz = tree.clazz; // Class field following new
2741 JCExpression clazzid; // Identifier in class field
2742 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2743 annoclazzid = null;
2744
2745 if (clazz.hasTag(TYPEAPPLY)) {
2746 clazzid = ((JCTypeApply) clazz).clazz;
2747 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2748 annoclazzid = (JCAnnotatedType) clazzid;
2749 clazzid = annoclazzid.underlyingType;
2750 }
2751 } else {
2752 if (clazz.hasTag(ANNOTATED_TYPE)) {
2753 annoclazzid = (JCAnnotatedType) clazz;
2754 clazzid = annoclazzid.underlyingType;
2755 } else {
2756 clazzid = clazz;
2757 }
2758 }
2759
2760 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2761
2762 if (tree.encl != null) {
2763 // We are seeing a qualified new, of the form
2764 // <expr>.new C <...> (...) ...
2765 // In this case, we let clazz stand for the name of the
2766 // allocated class C prefixed with the type of the qualifier
2767 // expression, so that we can
2768 // resolve it with standard techniques later. I.e., if
2769 // <expr> has type T, then <expr>.new C <...> (...)
2770 // yields a clazz T.C.
2771 Type encltype = chk.checkRefType(tree.encl.pos(),
2772 attribExpr(tree.encl, env));
2773 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2774 // from expr to the combined type, or not? Yes, do this.
2775 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2776 ((JCIdent) clazzid).name);
2777
2778 EndPosTable endPosTable = this.env.toplevel.endPositions;
2779 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2780 if (clazz.hasTag(ANNOTATED_TYPE)) {
2781 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2782 List<JCAnnotation> annos = annoType.annotations;
2783
2784 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2785 clazzid1 = make.at(tree.pos).
2786 TypeApply(clazzid1,
2787 ((JCTypeApply) clazz).arguments);
2788 }
2789
2790 clazzid1 = make.at(tree.pos).
2791 AnnotatedType(annos, clazzid1);
2792 } else if (clazz.hasTag(TYPEAPPLY)) {
2793 clazzid1 = make.at(tree.pos).
2794 TypeApply(clazzid1,
2795 ((JCTypeApply) clazz).arguments);
2796 }
2797
2798 clazz = clazzid1;
2799 }
2800
2801 // Attribute clazz expression and store
2802 // symbol + type back into the attributed tree.
2803 Type clazztype;
2804
2805 try {
2806 env.info.isAnonymousNewClass = tree.def != null;
2807 clazztype = TreeInfo.isEnumInit(env.tree) ?
2808 attribIdentAsEnumType(env, (JCIdent)clazz) :
2809 attribType(clazz, env);
2810 } finally {
2811 env.info.isAnonymousNewClass = false;
2812 }
2813
2814 clazztype = chk.checkDiamond(tree, clazztype);
2815 chk.validate(clazz, localEnv);
2816 if (tree.encl != null) {
2817 // We have to work in this case to store
2818 // symbol + type back into the attributed tree.
2819 tree.clazz.type = clazztype;
2820 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2821 clazzid.type = ((JCIdent) clazzid).sym.type;
2822 if (annoclazzid != null) {
2823 annoclazzid.type = clazzid.type;
2824 }
2825 if (!clazztype.isErroneous()) {
2826 if (cdef != null && clazztype.tsym.isInterface()) {
2827 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2828 } else if (clazztype.tsym.isStatic()) {
2829 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2830 }
2831 }
2832 } else {
2833 // Check for the existence of an apropos outer instance
2834 checkNewInnerClass(tree.pos(), env, clazztype, false);
2835 }
2836
2837 // Attribute constructor arguments.
2838 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2839 final KindSelector pkind =
2840 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2841 List<Type> argtypes = argtypesBuf.toList();
2842 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2843
2844 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2845 // Enums may not be instantiated except implicitly
2846 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2847 (!env.tree.hasTag(VARDEF) ||
2848 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2849 ((JCVariableDecl) env.tree).init != tree))
2850 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2851
2852 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2853 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2854 boolean skipNonDiamondPath = false;
2855 // Check that class is not abstract
2856 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2857 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2858 log.error(tree.pos(),
2859 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2860 skipNonDiamondPath = true;
2861 } else if (cdef != null && clazztype.tsym.isInterface()) {
2862 // Check that no constructor arguments are given to
2863 // anonymous classes implementing an interface
2864 if (!argtypes.isEmpty())
2865 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2866
2867 if (!typeargtypes.isEmpty())
2868 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2869
2870 // Error recovery: pretend no arguments were supplied.
2871 argtypes = List.nil();
2872 typeargtypes = List.nil();
2873 skipNonDiamondPath = true;
2874 }
2875 if (TreeInfo.isDiamond(tree)) {
2876 ClassType site = new ClassType(clazztype.getEnclosingType(),
2877 clazztype.tsym.type.getTypeArguments(),
2878 clazztype.tsym,
2879 clazztype.getMetadata());
2880
2881 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2882 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2883 diamondEnv.info.pendingResolutionPhase = null;
2884
2885 //if the type of the instance creation expression is a class type
2886 //apply method resolution inference (JLS 15.12.2.7). The return type
2887 //of the resolved constructor will be a partially instantiated type
2888 Symbol constructor = rs.resolveDiamond(tree.pos(),
2889 diamondEnv,
2890 site,
2891 argtypes,
2892 typeargtypes);
2893 tree.constructor = constructor.baseSymbol();
2894
2895 final TypeSymbol csym = clazztype.tsym;
2896 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2897 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2898 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2899 constructorType = checkId(tree, site,
2900 constructor,
2901 diamondEnv,
2902 diamondResult);
2903
2904 tree.clazz.type = types.createErrorType(clazztype);
2905 if (!constructorType.isErroneous()) {
2906 tree.clazz.type = clazz.type = constructorType.getReturnType();
2907 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2908 }
2909 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2910 }
2911
2912 // Resolve the called constructor under the assumption
2913 // that we are referring to a superclass instance of the
2914 // current instance (JLS ???).
2915 else if (!skipNonDiamondPath) {
2916 //the following code alters some of the fields in the current
2917 //AttrContext - hence, the current context must be dup'ed in
2918 //order to avoid downstream failures
2919 Env<AttrContext> rsEnv = localEnv.dup(tree);
2920 rsEnv.info.selectSuper = cdef != null;
2921 rsEnv.info.pendingResolutionPhase = null;
2922 tree.constructor = rs.resolveConstructor(
2923 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2924 if (cdef == null) { //do not check twice!
2925 tree.constructorType = checkId(tree,
2926 clazztype,
2927 tree.constructor,
2928 rsEnv,
2929 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2930 if (rsEnv.info.lastResolveVarargs())
2931 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2932 }
2933 }
2934
2935 if (cdef != null) {
2936 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2937 return;
2938 }
2939
2940 if (tree.constructor != null && tree.constructor.kind == MTH)
2941 owntype = clazztype;
2942 }
2943 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2944 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2945 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2946 //we need to wait for inference to finish and then replace inference vars in the constructor type
2947 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2948 instantiatedContext -> {
2949 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2950 });
2951 }
2952 chk.validate(tree.typeargs, localEnv);
2953 }
2954
2955 // where
2956 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2957 JCClassDecl cdef, Env<AttrContext> localEnv,
2958 List<Type> argtypes, List<Type> typeargtypes,
2959 KindSelector pkind) {
2960 // We are seeing an anonymous class instance creation.
2961 // In this case, the class instance creation
2962 // expression
2963 //
2964 // E.new <typeargs1>C<typargs2>(args) { ... }
2965 //
2966 // is represented internally as
2967 //
2968 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2969 //
2970 // This expression is then *transformed* as follows:
2971 //
2972 // (1) add an extends or implements clause
2973 // (2) add a constructor.
2974 //
2975 // For instance, if C is a class, and ET is the type of E,
2976 // the expression
2977 //
2978 // E.new <typeargs1>C<typargs2>(args) { ... }
2979 //
2980 // is translated to (where X is a fresh name and typarams is the
2981 // parameter list of the super constructor):
2982 //
2983 // new <typeargs1>X(<*nullchk*>E, args) where
2984 // X extends C<typargs2> {
2985 // <typarams> X(ET e, args) {
2986 // e.<typeargs1>super(args)
2987 // }
2988 // ...
2989 // }
2990 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2991 Type enclType = clazztype.getEnclosingType();
2992 if (enclType != null &&
2993 enclType.hasTag(CLASS) &&
2994 !chk.checkDenotable((ClassType)enclType)) {
2995 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2996 }
2997 final boolean isDiamond = TreeInfo.isDiamond(tree);
2998 if (isDiamond
2999 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3000 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3001 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3002 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3003 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3004 instantiatedContext -> {
3005 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3006 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3007 ResultInfo prevResult = this.resultInfo;
3008 try {
3009 this.resultInfo = resultInfoForClassDefinition;
3010 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3011 dupLocalEnv, argtypes, typeargtypes, pkind);
3012 } finally {
3013 this.resultInfo = prevResult;
3014 }
3015 });
3016 } else {
3017 if (isDiamond && clazztype.hasTag(CLASS)) {
3018 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3019 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3020 // One or more types inferred in the previous steps is non-denotable.
3021 Fragment fragment = Diamond(clazztype.tsym);
3022 log.error(tree.clazz.pos(),
3023 Errors.CantApplyDiamond1(
3024 fragment,
3025 invalidDiamondArgs.size() > 1 ?
3026 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3027 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3028 }
3029 // For <>(){}, inferred types must also be accessible.
3030 for (Type t : clazztype.getTypeArguments()) {
3031 rs.checkAccessibleType(env, t);
3032 }
3033 }
3034
3035 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3036 // false for isInterface call even when the original type is an interface.
3037 boolean implementing = clazztype.tsym.isInterface() ||
3038 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3039 clazztype.getOriginalType().tsym.isInterface();
3040
3041 if (implementing) {
3042 cdef.implementing = List.of(clazz);
3043 } else {
3044 cdef.extending = clazz;
3045 }
3046
3047 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3048 rs.isSerializable(clazztype)) {
3049 localEnv.info.isSerializable = true;
3050 }
3051
3052 attribStat(cdef, localEnv);
3053
3054 List<Type> finalargtypes;
3055 // If an outer instance is given,
3056 // prefix it to the constructor arguments
3057 // and delete it from the new expression
3058 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3059 finalargtypes = argtypes.prepend(tree.encl.type);
3060 } else {
3061 finalargtypes = argtypes;
3062 }
3063
3064 // Reassign clazztype and recompute constructor. As this necessarily involves
3065 // another attribution pass for deferred types in the case of <>, replicate
3066 // them. Original arguments have right decorations already.
3067 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3068 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3069 }
3070
3071 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3072 : cdef.sym.type;
3073 Symbol sym = tree.constructor = rs.resolveConstructor(
3074 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3075 Assert.check(!sym.kind.isResolutionError());
3076 tree.constructor = sym;
3077 tree.constructorType = checkId(tree,
3078 clazztype,
3079 tree.constructor,
3080 localEnv,
3081 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3082 }
3083 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3084 clazztype : types.createErrorType(tree.type);
3085 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3086 chk.validate(tree.typeargs, localEnv);
3087 }
3088
3089 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3090 return new Check.NestedCheckContext(checkContext) {
3091 @Override
3092 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3093 enclosingContext.report(clazz.clazz,
3094 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3095 }
3096 };
3097 }
3098
3099 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3100 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3101 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3102 (!isLocal && !type.tsym.isInner()) ||
3103 (isSuper && env.enclClass.sym.isAnonymous())) {
3104 // nothing to check
3105 return;
3106 }
3107 Symbol res = isLocal ?
3108 rs.findLocalClassOwner(env, type.tsym) :
3109 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3110 if (res.exists()) {
3111 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3112 } else {
3113 log.error(pos, Errors.EnclClassRequired(type.tsym));
3114 }
3115 }
3116
3117 /** Make an attributed null check tree.
3118 */
3119 public JCExpression makeNullCheck(JCExpression arg) {
3120 // optimization: new Outer() can never be null; skip null check
3121 if (arg.getTag() == NEWCLASS)
3122 return arg;
3123 // optimization: X.this is never null; skip null check
3124 Name name = TreeInfo.name(arg);
3125 if (name == names._this || name == names._super) return arg;
3126
3127 JCTree.Tag optag = NULLCHK;
3128 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3129 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3130 tree.type = arg.type;
3131 return tree;
3132 }
3133
3134 public void visitNewArray(JCNewArray tree) {
3135 Type owntype = types.createErrorType(tree.type);
3136 Env<AttrContext> localEnv = env.dup(tree);
3137 Type elemtype;
3138 if (tree.elemtype != null) {
3139 elemtype = attribType(tree.elemtype, localEnv);
3140 chk.validate(tree.elemtype, localEnv);
3141 owntype = elemtype;
3142 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3143 attribExpr(l.head, localEnv, syms.intType);
3144 owntype = new ArrayType(owntype, syms.arrayClass);
3145 }
3146 } else {
3147 // we are seeing an untyped aggregate { ... }
3148 // this is allowed only if the prototype is an array
3149 if (pt().hasTag(ARRAY)) {
3150 elemtype = types.elemtype(pt());
3151 } else {
3152 if (!pt().hasTag(ERROR) &&
3153 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3154 log.error(tree.pos(),
3155 Errors.IllegalInitializerForType(pt()));
3156 }
3157 elemtype = types.createErrorType(pt());
3158 }
3159 }
3160 if (tree.elems != null) {
3161 attribExprs(tree.elems, localEnv, elemtype);
3162 owntype = new ArrayType(elemtype, syms.arrayClass);
3163 }
3164 if (!types.isReifiable(elemtype))
3165 log.error(tree.pos(), Errors.GenericArrayCreation);
3166 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3167 }
3168
3169 /*
3170 * A lambda expression can only be attributed when a target-type is available.
3171 * In addition, if the target-type is that of a functional interface whose
3172 * descriptor contains inference variables in argument position the lambda expression
3173 * is 'stuck' (see DeferredAttr).
3174 */
3175 @Override
3176 public void visitLambda(final JCLambda that) {
3177 boolean wrongContext = false;
3178 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3179 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3180 //lambda only allowed in assignment or method invocation/cast context
3181 log.error(that.pos(), Errors.UnexpectedLambda);
3182 }
3183 resultInfo = recoveryInfo;
3184 wrongContext = true;
3185 }
3186 //create an environment for attribution of the lambda expression
3187 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3188 boolean needsRecovery =
3189 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3190 try {
3191 if (needsRecovery && rs.isSerializable(pt())) {
3192 localEnv.info.isSerializable = true;
3193 localEnv.info.isSerializableLambda = true;
3194 }
3195 List<Type> explicitParamTypes = null;
3196 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3197 //attribute lambda parameters
3198 attribStats(that.params, localEnv);
3199 explicitParamTypes = TreeInfo.types(that.params);
3200 }
3201
3202 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3203 Type currentTarget = targetInfo.target;
3204 Type lambdaType = targetInfo.descriptor;
3205
3206 if (currentTarget.isErroneous()) {
3207 result = that.type = currentTarget;
3208 return;
3209 }
3210
3211 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3212
3213 if (lambdaType.hasTag(FORALL)) {
3214 //lambda expression target desc cannot be a generic method
3215 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3216 kindName(currentTarget.tsym),
3217 currentTarget.tsym);
3218 resultInfo.checkContext.report(that, diags.fragment(msg));
3219 result = that.type = types.createErrorType(pt());
3220 return;
3221 }
3222
3223 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3224 //add param type info in the AST
3225 List<Type> actuals = lambdaType.getParameterTypes();
3226 List<JCVariableDecl> params = that.params;
3227
3228 boolean arityMismatch = false;
3229
3230 while (params.nonEmpty()) {
3231 if (actuals.isEmpty()) {
3232 //not enough actuals to perform lambda parameter inference
3233 arityMismatch = true;
3234 }
3235 //reset previously set info
3236 Type argType = arityMismatch ?
3237 syms.errType :
3238 actuals.head;
3239 if (params.head.isImplicitlyTyped()) {
3240 setSyntheticVariableType(params.head, argType);
3241 }
3242 params.head.sym = null;
3243 actuals = actuals.isEmpty() ?
3244 actuals :
3245 actuals.tail;
3246 params = params.tail;
3247 }
3248
3249 //attribute lambda parameters
3250 attribStats(that.params, localEnv);
3251
3252 if (arityMismatch) {
3253 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3254 result = that.type = types.createErrorType(currentTarget);
3255 return;
3256 }
3257 }
3258
3259 //from this point on, no recovery is needed; if we are in assignment context
3260 //we will be able to attribute the whole lambda body, regardless of errors;
3261 //if we are in a 'check' method context, and the lambda is not compatible
3262 //with the target-type, it will be recovered anyway in Attr.checkId
3263 needsRecovery = false;
3264
3265 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3266 lambdaBodyResult(that, lambdaType, resultInfo);
3267
3268 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3269 attribTree(that.getBody(), localEnv, bodyResultInfo);
3270 } else {
3271 JCBlock body = (JCBlock)that.body;
3272 if (body == breakTree &&
3273 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3274 breakTreeFound(copyEnv(localEnv));
3275 }
3276 attribStats(body.stats, localEnv);
3277 }
3278
3279 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3280
3281 boolean isSpeculativeRound =
3282 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3283
3284 preFlow(that);
3285 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3286
3287 that.type = currentTarget; //avoids recovery at this stage
3288 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3289
3290 if (!isSpeculativeRound) {
3291 //add thrown types as bounds to the thrown types free variables if needed:
3292 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3293 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3294 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3295 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3296 }
3297 }
3298
3299 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3300 }
3301 result = wrongContext ? that.type = types.createErrorType(pt())
3302 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3303 } catch (Types.FunctionDescriptorLookupError ex) {
3304 JCDiagnostic cause = ex.getDiagnostic();
3305 resultInfo.checkContext.report(that, cause);
3306 result = that.type = types.createErrorType(pt());
3307 return;
3308 } catch (CompletionFailure cf) {
3309 chk.completionError(that.pos(), cf);
3310 } catch (Throwable t) {
3311 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3312 //as that would likely cause the same exception again.
3313 needsRecovery = false;
3314 throw t;
3315 } finally {
3316 localEnv.info.scope.leave();
3317 if (needsRecovery) {
3318 Type prevResult = result;
3319 try {
3320 attribTree(that, env, recoveryInfo);
3321 } finally {
3322 if (result == Type.recoveryType) {
3323 result = prevResult;
3324 }
3325 }
3326 }
3327 }
3328 }
3329 //where
3330 class TargetInfo {
3331 Type target;
3332 Type descriptor;
3333
3334 public TargetInfo(Type target, Type descriptor) {
3335 this.target = target;
3336 this.descriptor = descriptor;
3337 }
3338 }
3339
3340 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3341 Type lambdaType;
3342 Type currentTarget = resultInfo.pt;
3343 if (resultInfo.pt != Type.recoveryType) {
3344 /* We need to adjust the target. If the target is an
3345 * intersection type, for example: SAM & I1 & I2 ...
3346 * the target will be updated to SAM
3347 */
3348 currentTarget = targetChecker.visit(currentTarget, that);
3349 if (!currentTarget.isIntersection()) {
3350 if (explicitParamTypes != null) {
3351 currentTarget = infer.instantiateFunctionalInterface(that,
3352 currentTarget, explicitParamTypes, resultInfo.checkContext);
3353 }
3354 currentTarget = types.removeWildcards(currentTarget);
3355 lambdaType = types.findDescriptorType(currentTarget);
3356 } else {
3357 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3358 ListBuffer<Type> components = new ListBuffer<>();
3359 for (Type bound : ict.getExplicitComponents()) {
3360 if (explicitParamTypes != null) {
3361 try {
3362 bound = infer.instantiateFunctionalInterface(that,
3363 bound, explicitParamTypes, resultInfo.checkContext);
3364 } catch (FunctionDescriptorLookupError t) {
3365 // do nothing
3366 }
3367 }
3368 bound = types.removeWildcards(bound);
3369 components.add(bound);
3370 }
3371 currentTarget = types.makeIntersectionType(components.toList());
3372 currentTarget.tsym.flags_field |= INTERFACE;
3373 lambdaType = types.findDescriptorType(currentTarget);
3374 }
3375
3376 } else {
3377 currentTarget = Type.recoveryType;
3378 lambdaType = fallbackDescriptorType(that);
3379 }
3380 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3381 //lambda expression target desc cannot be a generic method
3382 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3383 kindName(currentTarget.tsym),
3384 currentTarget.tsym);
3385 resultInfo.checkContext.report(that, diags.fragment(msg));
3386 currentTarget = types.createErrorType(pt());
3387 }
3388 return new TargetInfo(currentTarget, lambdaType);
3389 }
3390
3391 void preFlow(JCLambda tree) {
3392 attrRecover.doRecovery();
3393 new PostAttrAnalyzer() {
3394 @Override
3395 public void scan(JCTree tree) {
3396 if (tree == null ||
3397 (tree.type != null &&
3398 tree.type == Type.stuckType)) {
3399 //don't touch stuck expressions!
3400 return;
3401 }
3402 super.scan(tree);
3403 }
3404
3405 @Override
3406 public void visitClassDef(JCClassDecl that) {
3407 // or class declaration trees!
3408 }
3409
3410 public void visitLambda(JCLambda that) {
3411 // or lambda expressions!
3412 }
3413 }.scan(tree.body);
3414 }
3415
3416 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3417
3418 @Override
3419 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3420 return t.isIntersection() ?
3421 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3422 }
3423
3424 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3425 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3426 return ict;
3427 }
3428
3429 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3430 ListBuffer<Type> targs = new ListBuffer<>();
3431 ListBuffer<Type> supertypes = new ListBuffer<>();
3432 for (Type i : ict.interfaces_field) {
3433 if (i.isParameterized()) {
3434 targs.appendList(i.tsym.type.allparams());
3435 }
3436 supertypes.append(i.tsym.type);
3437 }
3438 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3439 notionalIntf.allparams_field = targs.toList();
3440 notionalIntf.tsym.flags_field |= INTERFACE;
3441 return notionalIntf.tsym;
3442 }
3443 };
3444
3445 private Type fallbackDescriptorType(JCExpression tree) {
3446 switch (tree.getTag()) {
3447 case LAMBDA:
3448 JCLambda lambda = (JCLambda)tree;
3449 List<Type> argtypes = List.nil();
3450 for (JCVariableDecl param : lambda.params) {
3451 argtypes = param.vartype != null && param.vartype.type != null ?
3452 argtypes.append(param.vartype.type) :
3453 argtypes.append(syms.errType);
3454 }
3455 return new MethodType(argtypes, Type.recoveryType,
3456 List.of(syms.throwableType), syms.methodClass);
3457 case REFERENCE:
3458 return new MethodType(List.nil(), Type.recoveryType,
3459 List.of(syms.throwableType), syms.methodClass);
3460 default:
3461 Assert.error("Cannot get here!");
3462 }
3463 return null;
3464 }
3465
3466 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3467 final InferenceContext inferenceContext, final Type... ts) {
3468 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3469 }
3470
3471 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3472 final InferenceContext inferenceContext, final List<Type> ts) {
3473 if (inferenceContext.free(ts)) {
3474 inferenceContext.addFreeTypeListener(ts,
3475 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3476 } else {
3477 for (Type t : ts) {
3478 rs.checkAccessibleType(env, t);
3479 }
3480 }
3481 }
3482
3483 /**
3484 * Lambda/method reference have a special check context that ensures
3485 * that i.e. a lambda return type is compatible with the expected
3486 * type according to both the inherited context and the assignment
3487 * context.
3488 */
3489 class FunctionalReturnContext extends Check.NestedCheckContext {
3490
3491 FunctionalReturnContext(CheckContext enclosingContext) {
3492 super(enclosingContext);
3493 }
3494
3495 @Override
3496 public boolean compatible(Type found, Type req, Warner warn) {
3497 //return type must be compatible in both current context and assignment context
3498 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3499 }
3500
3501 @Override
3502 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3503 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3504 }
3505 }
3506
3507 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3508
3509 JCExpression expr;
3510 boolean expStmtExpected;
3511
3512 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3513 super(enclosingContext);
3514 this.expr = expr;
3515 }
3516
3517 @Override
3518 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3519 if (expStmtExpected) {
3520 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3521 } else {
3522 super.report(pos, details);
3523 }
3524 }
3525
3526 @Override
3527 public boolean compatible(Type found, Type req, Warner warn) {
3528 //a void return is compatible with an expression statement lambda
3529 if (req.hasTag(VOID)) {
3530 expStmtExpected = true;
3531 return TreeInfo.isExpressionStatement(expr);
3532 } else {
3533 return super.compatible(found, req, warn);
3534 }
3535 }
3536 }
3537
3538 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3539 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3540 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3541 new FunctionalReturnContext(resultInfo.checkContext);
3542
3543 return descriptor.getReturnType() == Type.recoveryType ?
3544 recoveryInfo :
3545 new ResultInfo(KindSelector.VAL,
3546 descriptor.getReturnType(), funcContext);
3547 }
3548
3549 /**
3550 * Lambda compatibility. Check that given return types, thrown types, parameter types
3551 * are compatible with the expected functional interface descriptor. This means that:
3552 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3553 * types must be compatible with the return type of the expected descriptor.
3554 */
3555 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3556 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3557
3558 //return values have already been checked - but if lambda has no return
3559 //values, we must ensure that void/value compatibility is correct;
3560 //this amounts at checking that, if a lambda body can complete normally,
3561 //the descriptor's return type must be void
3562 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3563 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3564 Fragment msg =
3565 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3566 checkContext.report(tree,
3567 diags.fragment(msg));
3568 }
3569
3570 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3571 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3572 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3573 }
3574 }
3575
3576 /* This method returns an environment to be used to attribute a lambda
3577 * expression.
3578 *
3579 * The owner of this environment is a method symbol. If the current owner
3580 * is not a method (e.g. if the lambda occurs in a field initializer), then
3581 * a synthetic method symbol owner is created.
3582 */
3583 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3584 Env<AttrContext> lambdaEnv;
3585 Symbol owner = env.info.scope.owner;
3586 if (owner.kind == VAR && owner.owner.kind == TYP) {
3587 // If the lambda is nested in a field initializer, we need to create a fake init method.
3588 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3589 // init symbol's owner).
3590 ClassSymbol enclClass = owner.enclClass();
3591 Name initName = owner.isStatic() ? names.clinit : names.init;
3592 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3593 initName, initBlockType, enclClass);
3594 initSym.params = List.nil();
3595 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3596 } else {
3597 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3598 }
3599 lambdaEnv.info.yieldResult = null;
3600 lambdaEnv.info.isLambda = true;
3601 return lambdaEnv;
3602 }
3603
3604 @Override
3605 public void visitReference(final JCMemberReference that) {
3606 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3607 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3608 //method reference only allowed in assignment or method invocation/cast context
3609 log.error(that.pos(), Errors.UnexpectedMref);
3610 }
3611 result = that.type = types.createErrorType(pt());
3612 return;
3613 }
3614 final Env<AttrContext> localEnv = env.dup(that);
3615 try {
3616 //attribute member reference qualifier - if this is a constructor
3617 //reference, the expected kind must be a type
3618 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3619
3620 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3621 exprType = chk.checkConstructorRefType(that.expr, exprType);
3622 if (!exprType.isErroneous() &&
3623 exprType.isRaw() &&
3624 that.typeargs != null) {
3625 log.error(that.expr.pos(),
3626 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3627 Fragments.MrefInferAndExplicitParams));
3628 exprType = types.createErrorType(exprType);
3629 }
3630 }
3631
3632 if (exprType.isErroneous()) {
3633 //if the qualifier expression contains problems,
3634 //give up attribution of method reference
3635 result = that.type = exprType;
3636 return;
3637 }
3638
3639 if (TreeInfo.isStaticSelector(that.expr, names)) {
3640 //if the qualifier is a type, validate it; raw warning check is
3641 //omitted as we don't know at this stage as to whether this is a
3642 //raw selector (because of inference)
3643 chk.validate(that.expr, env, false);
3644 } else {
3645 Symbol lhsSym = TreeInfo.symbol(that.expr);
3646 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3647 }
3648 //attrib type-arguments
3649 List<Type> typeargtypes = List.nil();
3650 if (that.typeargs != null) {
3651 typeargtypes = attribTypes(that.typeargs, localEnv);
3652 }
3653
3654 boolean isTargetSerializable =
3655 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3656 rs.isSerializable(pt());
3657 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3658 Type currentTarget = targetInfo.target;
3659 Type desc = targetInfo.descriptor;
3660
3661 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3662 List<Type> argtypes = desc.getParameterTypes();
3663 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3664
3665 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3666 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3667 }
3668
3669 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3670 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3671 try {
3672 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3673 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3674 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3675 } finally {
3676 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3677 }
3678
3679 Symbol refSym = refResult.fst;
3680 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3681
3682 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3683 * JDK-8075541
3684 */
3685 if (refSym.kind != MTH) {
3686 boolean targetError;
3687 switch (refSym.kind) {
3688 case ABSENT_MTH:
3689 targetError = false;
3690 break;
3691 case WRONG_MTH:
3692 case WRONG_MTHS:
3693 case AMBIGUOUS:
3694 case HIDDEN:
3695 case STATICERR:
3696 targetError = true;
3697 break;
3698 default:
3699 Assert.error("unexpected result kind " + refSym.kind);
3700 targetError = false;
3701 }
3702
3703 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3704 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3705 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3706
3707 JCDiagnostic diag = diags.create(log.currentSource(), that,
3708 targetError ?
3709 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3710 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3711
3712 if (targetError && currentTarget == Type.recoveryType) {
3713 //a target error doesn't make sense during recovery stage
3714 //as we don't know what actual parameter types are
3715 result = that.type = currentTarget;
3716 return;
3717 } else {
3718 if (targetError) {
3719 resultInfo.checkContext.report(that, diag);
3720 } else {
3721 log.report(diag);
3722 }
3723 result = that.type = types.createErrorType(currentTarget);
3724 return;
3725 }
3726 }
3727
3728 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3729 that.kind = lookupHelper.referenceKind(that.sym);
3730 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3731
3732 if (desc.getReturnType() == Type.recoveryType) {
3733 // stop here
3734 result = that.type = currentTarget;
3735 return;
3736 }
3737
3738 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3739 checkNewInnerClass(that.pos(), env, exprType, false);
3740 }
3741
3742 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3743
3744 if (that.getMode() == ReferenceMode.INVOKE &&
3745 TreeInfo.isStaticSelector(that.expr, names) &&
3746 that.kind.isUnbound() &&
3747 lookupHelper.site.isRaw()) {
3748 chk.checkRaw(that.expr, localEnv);
3749 }
3750
3751 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3752 exprType.getTypeArguments().nonEmpty()) {
3753 //static ref with class type-args
3754 log.error(that.expr.pos(),
3755 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3756 Fragments.StaticMrefWithTargs));
3757 result = that.type = types.createErrorType(currentTarget);
3758 return;
3759 }
3760
3761 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3762 // Check that super-qualified symbols are not abstract (JLS)
3763 rs.checkNonAbstract(that.pos(), that.sym);
3764 }
3765
3766 if (isTargetSerializable) {
3767 chk.checkAccessFromSerializableElement(that, true);
3768 }
3769 }
3770
3771 ResultInfo checkInfo =
3772 resultInfo.dup(newMethodTemplate(
3773 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3774 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3775 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3776
3777 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3778
3779 if (that.kind.isUnbound() &&
3780 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3781 //re-generate inference constraints for unbound receiver
3782 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3783 //cannot happen as this has already been checked - we just need
3784 //to regenerate the inference constraints, as that has been lost
3785 //as a result of the call to inferenceContext.save()
3786 Assert.error("Can't get here");
3787 }
3788 }
3789
3790 if (!refType.isErroneous()) {
3791 refType = types.createMethodTypeWithReturn(refType,
3792 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3793 }
3794
3795 //go ahead with standard method reference compatibility check - note that param check
3796 //is a no-op (as this has been taken care during method applicability)
3797 boolean isSpeculativeRound =
3798 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3799
3800 that.type = currentTarget; //avoids recovery at this stage
3801 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3802 if (!isSpeculativeRound) {
3803 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3804 }
3805 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3806 } catch (Types.FunctionDescriptorLookupError ex) {
3807 JCDiagnostic cause = ex.getDiagnostic();
3808 resultInfo.checkContext.report(that, cause);
3809 result = that.type = types.createErrorType(pt());
3810 return;
3811 }
3812 }
3813 //where
3814 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3815 //if this is a constructor reference, the expected kind must be a type
3816 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3817 KindSelector.VAL_TYP : KindSelector.TYP,
3818 Type.noType);
3819 }
3820
3821
3822 @SuppressWarnings("fallthrough")
3823 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3824 InferenceContext inferenceContext = checkContext.inferenceContext();
3825 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3826
3827 Type resType;
3828 switch (tree.getMode()) {
3829 case NEW:
3830 if (!tree.expr.type.isRaw()) {
3831 resType = tree.expr.type;
3832 break;
3833 }
3834 default:
3835 resType = refType.getReturnType();
3836 }
3837
3838 Type incompatibleReturnType = resType;
3839
3840 if (returnType.hasTag(VOID)) {
3841 incompatibleReturnType = null;
3842 }
3843
3844 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3845 if (resType.isErroneous() ||
3846 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3847 checkContext.checkWarner(tree, resType, returnType))) {
3848 incompatibleReturnType = null;
3849 }
3850 }
3851
3852 if (incompatibleReturnType != null) {
3853 Fragment msg =
3854 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3855 checkContext.report(tree, diags.fragment(msg));
3856 } else {
3857 if (inferenceContext.free(refType)) {
3858 // we need to wait for inference to finish and then replace inference vars in the referent type
3859 inferenceContext.addFreeTypeListener(List.of(refType),
3860 instantiatedContext -> {
3861 tree.referentType = instantiatedContext.asInstType(refType);
3862 });
3863 } else {
3864 tree.referentType = refType;
3865 }
3866 }
3867
3868 if (!speculativeAttr) {
3869 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3870 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3871 }
3872 }
3873 }
3874
3875 boolean checkExConstraints(
3876 List<Type> thrownByFuncExpr,
3877 List<Type> thrownAtFuncType,
3878 InferenceContext inferenceContext) {
3879 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3880 * are not proper types
3881 */
3882 List<Type> nonProperList = thrownAtFuncType.stream()
3883 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3884 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3885
3886 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3887 * in the throws clause of the invocation type of the method reference's compile-time
3888 * declaration
3889 */
3890 List<Type> checkedList = thrownByFuncExpr.stream()
3891 .filter(e -> chk.isChecked(e)).collect(List.collector());
3892
3893 /** If n = 0 (the function type's throws clause consists only of proper types), then
3894 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3895 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3896 * reduces to true
3897 */
3898 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3899 for (Type checked : checkedList) {
3900 boolean isSubtype = false;
3901 for (Type proper : properList) {
3902 if (types.isSubtype(checked, proper)) {
3903 isSubtype = true;
3904 break;
3905 }
3906 }
3907 if (!isSubtype) {
3908 uncaughtByProperTypes.add(checked);
3909 }
3910 }
3911
3912 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3913 return false;
3914 }
3915
3916 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3917 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3918 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3919 */
3920 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3921 uncaughtByProperTypes.forEach(checkedEx -> {
3922 nonProperAsUndet.forEach(nonProper -> {
3923 types.isSubtype(checkedEx, nonProper);
3924 });
3925 });
3926
3927 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3928 */
3929 nonProperAsUndet.stream()
3930 .filter(t -> t.hasTag(UNDETVAR))
3931 .forEach(t -> ((UndetVar)t).setThrow());
3932 return true;
3933 }
3934
3935 /**
3936 * Set functional type info on the underlying AST. Note: as the target descriptor
3937 * might contain inference variables, we might need to register an hook in the
3938 * current inference context.
3939 */
3940 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3941 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3942 if (checkContext.inferenceContext().free(descriptorType)) {
3943 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3944 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3945 inferenceContext.asInstType(primaryTarget), checkContext));
3946 } else {
3947 fExpr.owner = env.info.scope.owner;
3948 if (pt.hasTag(CLASS)) {
3949 fExpr.target = primaryTarget;
3950 }
3951 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3952 pt != Type.recoveryType) {
3953 //check that functional interface class is well-formed
3954 try {
3955 /* Types.makeFunctionalInterfaceClass() may throw an exception
3956 * when it's executed post-inference. See the listener code
3957 * above.
3958 */
3959 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3960 names.empty, fExpr.target, ABSTRACT);
3961 if (csym != null) {
3962 chk.checkImplementations(env.tree, csym, csym);
3963 try {
3964 //perform an additional functional interface check on the synthetic class,
3965 //as there may be spurious errors for raw targets - because of existing issues
3966 //with membership and inheritance (see JDK-8074570).
3967 csym.flags_field |= INTERFACE;
3968 types.findDescriptorType(csym.type);
3969 } catch (FunctionDescriptorLookupError err) {
3970 resultInfo.checkContext.report(fExpr,
3971 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3972 }
3973 }
3974 } catch (Types.FunctionDescriptorLookupError ex) {
3975 JCDiagnostic cause = ex.getDiagnostic();
3976 resultInfo.checkContext.report(env.tree, cause);
3977 }
3978 }
3979 }
3980 }
3981
3982 public void visitParens(JCParens tree) {
3983 Type owntype = attribTree(tree.expr, env, resultInfo);
3984 result = check(tree, owntype, pkind(), resultInfo);
3985 Symbol sym = TreeInfo.symbol(tree);
3986 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3987 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3988 }
3989
3990 public void visitAssign(JCAssign tree) {
3991 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3992 Type capturedType = capture(owntype);
3993 attribExpr(tree.rhs, env, owntype);
3994 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3995 }
3996
3997 public void visitAssignop(JCAssignOp tree) {
3998 // Attribute arguments.
3999 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4000 Type operand = attribExpr(tree.rhs, env);
4001 // Find operator.
4002 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4003 if (operator != operators.noOpSymbol &&
4004 !owntype.isErroneous() &&
4005 !operand.isErroneous()) {
4006 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4007 chk.checkCastable(tree.rhs.pos(),
4008 operator.type.getReturnType(),
4009 owntype);
4010 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4011 }
4012 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4013 }
4014
4015 public void visitUnary(JCUnary tree) {
4016 // Attribute arguments.
4017 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4018 ? attribTree(tree.arg, env, varAssignmentInfo)
4019 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4020
4021 // Find operator.
4022 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4023 Type owntype = types.createErrorType(tree.type);
4024 if (operator != operators.noOpSymbol &&
4025 !argtype.isErroneous()) {
4026 owntype = (tree.getTag().isIncOrDecUnaryOp())
4027 ? tree.arg.type
4028 : operator.type.getReturnType();
4029 int opc = operator.opcode;
4030
4031 // If the argument is constant, fold it.
4032 if (argtype.constValue() != null) {
4033 Type ctype = cfolder.fold1(opc, argtype);
4034 if (ctype != null) {
4035 owntype = cfolder.coerce(ctype, owntype);
4036 }
4037 }
4038 }
4039 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4040 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4041 }
4042
4043 public void visitBinary(JCBinary tree) {
4044 // Attribute arguments.
4045 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4046 // x && y
4047 // include x's bindings when true in y
4048
4049 // x || y
4050 // include x's bindings when false in y
4051
4052 MatchBindings lhsBindings = matchBindings;
4053 List<BindingSymbol> propagatedBindings;
4054 switch (tree.getTag()) {
4055 case AND:
4056 propagatedBindings = lhsBindings.bindingsWhenTrue;
4057 break;
4058 case OR:
4059 propagatedBindings = lhsBindings.bindingsWhenFalse;
4060 break;
4061 default:
4062 propagatedBindings = List.nil();
4063 break;
4064 }
4065 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4066 Type right;
4067 try {
4068 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4069 } finally {
4070 rhsEnv.info.scope.leave();
4071 }
4072
4073 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4074
4075 // Find operator.
4076 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4077 Type owntype = types.createErrorType(tree.type);
4078 if (operator != operators.noOpSymbol &&
4079 !left.isErroneous() &&
4080 !right.isErroneous()) {
4081 owntype = operator.type.getReturnType();
4082 int opc = operator.opcode;
4083 // If both arguments are constants, fold them.
4084 if (left.constValue() != null && right.constValue() != null) {
4085 Type ctype = cfolder.fold2(opc, left, right);
4086 if (ctype != null) {
4087 owntype = cfolder.coerce(ctype, owntype);
4088 }
4089 }
4090
4091 // Check that argument types of a reference ==, != are
4092 // castable to each other, (JLS 15.21). Note: unboxing
4093 // comparisons will not have an acmp* opc at this point.
4094 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4095 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4096 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4097 }
4098 }
4099
4100 chk.checkDivZero(tree.rhs.pos(), operator, right);
4101 }
4102 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4103 }
4104
4105 public void visitTypeCast(final JCTypeCast tree) {
4106 Type clazztype = attribType(tree.clazz, env);
4107 chk.validate(tree.clazz, env, false);
4108 //a fresh environment is required for 292 inference to work properly ---
4109 //see Infer.instantiatePolymorphicSignatureInstance()
4110 Env<AttrContext> localEnv = env.dup(tree);
4111 //should we propagate the target type?
4112 final ResultInfo castInfo;
4113 JCExpression expr = TreeInfo.skipParens(tree.expr);
4114 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4115 if (isPoly) {
4116 //expression is a poly - we need to propagate target type info
4117 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4118 new Check.NestedCheckContext(resultInfo.checkContext) {
4119 @Override
4120 public boolean compatible(Type found, Type req, Warner warn) {
4121 return types.isCastable(found, req, warn);
4122 }
4123 });
4124 } else {
4125 //standalone cast - target-type info is not propagated
4126 castInfo = unknownExprInfo;
4127 }
4128 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4129 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4130 if (exprtype.constValue() != null)
4131 owntype = cfolder.coerce(exprtype, owntype);
4132 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4133 if (!isPoly)
4134 chk.checkRedundantCast(localEnv, tree);
4135 }
4136
4137 public void visitTypeTest(JCInstanceOf tree) {
4138 Type exprtype = attribExpr(tree.expr, env);
4139 if (exprtype.isPrimitive()) {
4140 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4141 } else {
4142 exprtype = chk.checkNullOrRefType(
4143 tree.expr.pos(), exprtype);
4144 }
4145 Type clazztype;
4146 JCTree typeTree;
4147 if (tree.pattern.getTag() == BINDINGPATTERN ||
4148 tree.pattern.getTag() == RECORDPATTERN) {
4149 attribExpr(tree.pattern, env, exprtype);
4150 clazztype = tree.pattern.type;
4151 if (types.isSubtype(exprtype, clazztype) &&
4152 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4153 tree.pattern.getTag() != RECORDPATTERN) {
4154 if (!allowUnconditionalPatternsInstanceOf) {
4155 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4156 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4157 }
4158 }
4159 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4160 } else {
4161 clazztype = attribType(tree.pattern, env);
4162 typeTree = tree.pattern;
4163 chk.validate(typeTree, env, false);
4164 }
4165 if (clazztype.isPrimitive()) {
4166 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4167 } else {
4168 if (!clazztype.hasTag(TYPEVAR)) {
4169 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4170 }
4171 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4172 boolean valid = false;
4173 if (allowReifiableTypesInInstanceof) {
4174 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4175 } else {
4176 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4177 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4178 allowReifiableTypesInInstanceof = true;
4179 }
4180 if (!valid) {
4181 clazztype = types.createErrorType(clazztype);
4182 }
4183 }
4184 }
4185 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4186 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4187 }
4188
4189 private boolean checkCastablePattern(DiagnosticPosition pos,
4190 Type exprType,
4191 Type pattType) {
4192 Warner warner = new Warner();
4193 // if any type is erroneous, the problem is reported elsewhere
4194 if (exprType.isErroneous() || pattType.isErroneous()) {
4195 return false;
4196 }
4197 if (!types.isCastable(exprType, pattType, warner)) {
4198 chk.basicHandler.report(pos,
4199 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4200 return false;
4201 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4202 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4203 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4204 return true;
4205 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4206 log.error(pos,
4207 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4208 return false;
4209 } else {
4210 return true;
4211 }
4212 }
4213
4214 @Override
4215 public void visitAnyPattern(JCAnyPattern tree) {
4216 result = tree.type = resultInfo.pt;
4217 }
4218
4219 public void visitBindingPattern(JCBindingPattern tree) {
4220 Type type;
4221 if (tree.var.vartype != null) {
4222 type = attribType(tree.var.vartype, env);
4223 } else {
4224 type = resultInfo.pt;
4225 }
4226 tree.type = tree.var.type = type;
4227 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4228 v.pos = tree.pos;
4229 tree.var.sym = v;
4230 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4231 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4232 }
4233 chk.validate(tree.var.vartype, env, true);
4234 if (tree.var.isImplicitlyTyped()) {
4235 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4236 : type);
4237 }
4238 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.var);
4239 if (!tree.var.isImplicitlyTyped()) {
4240 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var);
4241 }
4242 annotate.flush();
4243 result = tree.type;
4244 if (v.isUnnamedVariable()) {
4245 matchBindings = MatchBindingsComputer.EMPTY;
4246 } else {
4247 matchBindings = new MatchBindings(List.of(v), List.nil());
4248 }
4249 }
4250
4251 @Override
4252 public void visitRecordPattern(JCRecordPattern tree) {
4253 Type site;
4254
4255 if (tree.deconstructor == null) {
4256 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4257 tree.record = syms.errSymbol;
4258 site = tree.type = types.createErrorType(tree.record.type);
4259 } else {
4260 Type type = attribType(tree.deconstructor, env);
4261 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4262 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4263 if (inferred == null) {
4264 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4265 } else {
4266 type = inferred;
4267 }
4268 }
4269 tree.type = tree.deconstructor.type = type;
4270 site = types.capture(tree.type);
4271 }
4272
4273 List<Type> expectedRecordTypes;
4274 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4275 ClassSymbol record = (ClassSymbol) site.tsym;
4276 expectedRecordTypes = record.getRecordComponents()
4277 .stream()
4278 .map(rc -> types.memberType(site, rc))
4279 .map(t -> types.upward(t, types.captures(t)).baseType())
4280 .collect(List.collector());
4281 tree.record = record;
4282 } else {
4283 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4284 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4285 .limit(tree.nested.size())
4286 .collect(List.collector());
4287 tree.record = syms.errSymbol;
4288 }
4289 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4290 List<Type> recordTypes = expectedRecordTypes;
4291 List<JCPattern> nestedPatterns = tree.nested;
4292 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4293 try {
4294 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4295 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4296 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4297 outBindings.addAll(matchBindings.bindingsWhenTrue);
4298 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4299 nestedPatterns = nestedPatterns.tail;
4300 recordTypes = recordTypes.tail;
4301 }
4302 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4303 while (nestedPatterns.nonEmpty()) {
4304 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4305 nestedPatterns = nestedPatterns.tail;
4306 }
4307 List<Type> nestedTypes =
4308 tree.nested.stream().map(p -> p.type).collect(List.collector());
4309 log.error(tree.pos(),
4310 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4311 nestedTypes));
4312 }
4313 } finally {
4314 localEnv.info.scope.leave();
4315 }
4316 chk.validate(tree.deconstructor, env, true);
4317 result = tree.type;
4318 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4319 }
4320
4321 public void visitIndexed(JCArrayAccess tree) {
4322 Type owntype = types.createErrorType(tree.type);
4323 Type atype = attribExpr(tree.indexed, env);
4324 attribExpr(tree.index, env, syms.intType);
4325 if (types.isArray(atype))
4326 owntype = types.elemtype(atype);
4327 else if (!atype.hasTag(ERROR))
4328 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4329 if (!pkind().contains(KindSelector.VAL))
4330 owntype = capture(owntype);
4331 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4332 }
4333
4334 public void visitIdent(JCIdent tree) {
4335 Symbol sym;
4336
4337 // Find symbol
4338 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4339 // If we are looking for a method, the prototype `pt' will be a
4340 // method type with the type of the call's arguments as parameters.
4341 env.info.pendingResolutionPhase = null;
4342 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4343 } else if (tree.sym != null && tree.sym.kind != VAR) {
4344 sym = tree.sym;
4345 } else {
4346 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4347 }
4348 tree.sym = sym;
4349
4350 // Also find the environment current for the class where
4351 // sym is defined (`symEnv').
4352 Env<AttrContext> symEnv = env;
4353 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4354 sym.kind.matches(KindSelector.VAL_MTH) &&
4355 sym.owner.kind == TYP &&
4356 tree.name != names._this && tree.name != names._super) {
4357
4358 // Find environment in which identifier is defined.
4359 while (symEnv.outer != null &&
4360 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4361 symEnv = symEnv.outer;
4362 }
4363 }
4364
4365 // If symbol is a variable, ...
4366 if (sym.kind == VAR) {
4367 VarSymbol v = (VarSymbol)sym;
4368
4369 // ..., evaluate its initializer, if it has one, and check for
4370 // illegal forward reference.
4371 checkInit(tree, env, v, false);
4372
4373 // If we are expecting a variable (as opposed to a value), check
4374 // that the variable is assignable in the current environment.
4375 if (KindSelector.ASG.subset(pkind()))
4376 checkAssignable(tree.pos(), v, null, env);
4377 }
4378
4379 Env<AttrContext> env1 = env;
4380 if (sym.kind != ERR && sym.kind != TYP &&
4381 sym.owner != null && sym.owner != env1.enclClass.sym) {
4382 // If the found symbol is inaccessible, then it is
4383 // accessed through an enclosing instance. Locate this
4384 // enclosing instance:
4385 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4386 env1 = env1.outer;
4387 }
4388
4389 if (env.info.isSerializable) {
4390 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4391 }
4392
4393 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4394 }
4395
4396 public void visitSelect(JCFieldAccess tree) {
4397 // Determine the expected kind of the qualifier expression.
4398 KindSelector skind = KindSelector.NIL;
4399 if (tree.name == names._this || tree.name == names._super ||
4400 tree.name == names._class)
4401 {
4402 skind = KindSelector.TYP;
4403 } else {
4404 if (pkind().contains(KindSelector.PCK))
4405 skind = KindSelector.of(skind, KindSelector.PCK);
4406 if (pkind().contains(KindSelector.TYP))
4407 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4408 if (pkind().contains(KindSelector.VAL_MTH))
4409 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4410 }
4411
4412 // Attribute the qualifier expression, and determine its symbol (if any).
4413 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4414 Assert.check(site == tree.selected.type);
4415 if (!pkind().contains(KindSelector.TYP_PCK))
4416 site = capture(site); // Capture field access
4417
4418 // don't allow T.class T[].class, etc
4419 if (skind == KindSelector.TYP) {
4420 Type elt = site;
4421 while (elt.hasTag(ARRAY))
4422 elt = ((ArrayType)elt).elemtype;
4423 if (elt.hasTag(TYPEVAR)) {
4424 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4425 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4426 tree.sym = tree.type.tsym;
4427 return ;
4428 }
4429 }
4430
4431 // If qualifier symbol is a type or `super', assert `selectSuper'
4432 // for the selection. This is relevant for determining whether
4433 // protected symbols are accessible.
4434 Symbol sitesym = TreeInfo.symbol(tree.selected);
4435 boolean selectSuperPrev = env.info.selectSuper;
4436 env.info.selectSuper =
4437 sitesym != null &&
4438 sitesym.name == names._super;
4439
4440 // Determine the symbol represented by the selection.
4441 env.info.pendingResolutionPhase = null;
4442 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4443 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4444 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4445 sym = syms.errSymbol;
4446 }
4447 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4448 site = capture(site);
4449 sym = selectSym(tree, sitesym, site, env, resultInfo);
4450 }
4451 boolean varArgs = env.info.lastResolveVarargs();
4452 tree.sym = sym;
4453
4454 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4455 site = types.skipTypeVars(site, true);
4456 }
4457
4458 // If that symbol is a variable, ...
4459 if (sym.kind == VAR) {
4460 VarSymbol v = (VarSymbol)sym;
4461
4462 // ..., evaluate its initializer, if it has one, and check for
4463 // illegal forward reference.
4464 checkInit(tree, env, v, true);
4465
4466 // If we are expecting a variable (as opposed to a value), check
4467 // that the variable is assignable in the current environment.
4468 if (KindSelector.ASG.subset(pkind()))
4469 checkAssignable(tree.pos(), v, tree.selected, env);
4470 }
4471
4472 if (sitesym != null &&
4473 sitesym.kind == VAR &&
4474 ((VarSymbol)sitesym).isResourceVariable() &&
4475 sym.kind == MTH &&
4476 sym.name.equals(names.close) &&
4477 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4478 env.info.lint.logIfEnabled(tree, LintWarnings.TryExplicitCloseCall);
4479 }
4480
4481 // Disallow selecting a type from an expression
4482 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4483 tree.type = check(tree.selected, pt(),
4484 sitesym == null ?
4485 KindSelector.VAL : sitesym.kind.toSelector(),
4486 new ResultInfo(KindSelector.TYP_PCK, pt()));
4487 }
4488
4489 if (isType(sitesym)) {
4490 if (sym.name != names._this && sym.name != names._super) {
4491 // Check if type-qualified fields or methods are static (JLS)
4492 if ((sym.flags() & STATIC) == 0 &&
4493 sym.name != names._super &&
4494 (sym.kind == VAR || sym.kind == MTH)) {
4495 rs.accessBase(rs.new StaticError(sym),
4496 tree.pos(), site, sym.name, true);
4497 }
4498 }
4499 } else if (sym.kind != ERR &&
4500 (sym.flags() & STATIC) != 0 &&
4501 sym.name != names._class) {
4502 // If the qualified item is not a type and the selected item is static, report
4503 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4504 if (!sym.owner.isAnonymous()) {
4505 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4506 } else {
4507 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4508 }
4509 }
4510
4511 // If we are selecting an instance member via a `super', ...
4512 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4513
4514 // Check that super-qualified symbols are not abstract (JLS)
4515 rs.checkNonAbstract(tree.pos(), sym);
4516
4517 if (site.isRaw()) {
4518 // Determine argument types for site.
4519 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4520 if (site1 != null) site = site1;
4521 }
4522 }
4523
4524 if (env.info.isSerializable) {
4525 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4526 }
4527
4528 env.info.selectSuper = selectSuperPrev;
4529 result = checkId(tree, site, sym, env, resultInfo);
4530 }
4531 //where
4532 /** Determine symbol referenced by a Select expression,
4533 *
4534 * @param tree The select tree.
4535 * @param site The type of the selected expression,
4536 * @param env The current environment.
4537 * @param resultInfo The current result.
4538 */
4539 private Symbol selectSym(JCFieldAccess tree,
4540 Symbol location,
4541 Type site,
4542 Env<AttrContext> env,
4543 ResultInfo resultInfo) {
4544 DiagnosticPosition pos = tree.pos();
4545 Name name = tree.name;
4546 switch (site.getTag()) {
4547 case PACKAGE:
4548 return rs.accessBase(
4549 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4550 pos, location, site, name, true);
4551 case ARRAY:
4552 case CLASS:
4553 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4554 return rs.resolveQualifiedMethod(
4555 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4556 } else if (name == names._this || name == names._super) {
4557 return rs.resolveSelf(pos, env, site.tsym, name);
4558 } else if (name == names._class) {
4559 // In this case, we have already made sure in
4560 // visitSelect that qualifier expression is a type.
4561 return syms.getClassField(site, types);
4562 } else {
4563 // We are seeing a plain identifier as selector.
4564 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4565 sym = rs.accessBase(sym, pos, location, site, name, true);
4566 return sym;
4567 }
4568 case WILDCARD:
4569 throw new AssertionError(tree);
4570 case TYPEVAR:
4571 // Normally, site.getUpperBound() shouldn't be null.
4572 // It should only happen during memberEnter/attribBase
4573 // when determining the supertype which *must* be
4574 // done before attributing the type variables. In
4575 // other words, we are seeing this illegal program:
4576 // class B<T> extends A<T.foo> {}
4577 Symbol sym = (site.getUpperBound() != null)
4578 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4579 : null;
4580 if (sym == null) {
4581 log.error(pos, Errors.TypeVarCantBeDeref);
4582 return syms.errSymbol;
4583 } else {
4584 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4585 rs.new AccessError(env, site, sym) :
4586 sym;
4587 rs.accessBase(sym2, pos, location, site, name, true);
4588 return sym;
4589 }
4590 case ERROR:
4591 // preserve identifier names through errors
4592 return types.createErrorType(name, site.tsym, site).tsym;
4593 default:
4594 // The qualifier expression is of a primitive type -- only
4595 // .class is allowed for these.
4596 if (name == names._class) {
4597 // In this case, we have already made sure in Select that
4598 // qualifier expression is a type.
4599 return syms.getClassField(site, types);
4600 } else {
4601 log.error(pos, Errors.CantDeref(site));
4602 return syms.errSymbol;
4603 }
4604 }
4605 }
4606
4607 /** Determine type of identifier or select expression and check that
4608 * (1) the referenced symbol is not deprecated
4609 * (2) the symbol's type is safe (@see checkSafe)
4610 * (3) if symbol is a variable, check that its type and kind are
4611 * compatible with the prototype and protokind.
4612 * (4) if symbol is an instance field of a raw type,
4613 * which is being assigned to, issue an unchecked warning if its
4614 * type changes under erasure.
4615 * (5) if symbol is an instance method of a raw type, issue an
4616 * unchecked warning if its argument types change under erasure.
4617 * If checks succeed:
4618 * If symbol is a constant, return its constant type
4619 * else if symbol is a method, return its result type
4620 * otherwise return its type.
4621 * Otherwise return errType.
4622 *
4623 * @param tree The syntax tree representing the identifier
4624 * @param site If this is a select, the type of the selected
4625 * expression, otherwise the type of the current class.
4626 * @param sym The symbol representing the identifier.
4627 * @param env The current environment.
4628 * @param resultInfo The expected result
4629 */
4630 Type checkId(JCTree tree,
4631 Type site,
4632 Symbol sym,
4633 Env<AttrContext> env,
4634 ResultInfo resultInfo) {
4635 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4636 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4637 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4638 }
4639
4640 Type checkMethodIdInternal(JCTree tree,
4641 Type site,
4642 Symbol sym,
4643 Env<AttrContext> env,
4644 ResultInfo resultInfo) {
4645 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4646 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4647 } else {
4648 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4649 }
4650 }
4651
4652 Type checkIdInternal(JCTree tree,
4653 Type site,
4654 Symbol sym,
4655 Type pt,
4656 Env<AttrContext> env,
4657 ResultInfo resultInfo) {
4658 Type owntype; // The computed type of this identifier occurrence.
4659 switch (sym.kind) {
4660 case TYP:
4661 // For types, the computed type equals the symbol's type,
4662 // except for two situations:
4663 owntype = sym.type;
4664 if (owntype.hasTag(CLASS)) {
4665 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4666 Type ownOuter = owntype.getEnclosingType();
4667
4668 // (a) If the symbol's type is parameterized, erase it
4669 // because no type parameters were given.
4670 // We recover generic outer type later in visitTypeApply.
4671 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4672 owntype = types.erasure(owntype);
4673 }
4674
4675 // (b) If the symbol's type is an inner class, then
4676 // we have to interpret its outer type as a superclass
4677 // of the site type. Example:
4678 //
4679 // class Tree<A> { class Visitor { ... } }
4680 // class PointTree extends Tree<Point> { ... }
4681 // ...PointTree.Visitor...
4682 //
4683 // Then the type of the last expression above is
4684 // Tree<Point>.Visitor.
4685 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4686 Type normOuter = site;
4687 if (normOuter.hasTag(CLASS)) {
4688 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4689 }
4690 if (normOuter == null) // perhaps from an import
4691 normOuter = types.erasure(ownOuter);
4692 if (normOuter != ownOuter)
4693 owntype = new ClassType(
4694 normOuter, List.nil(), owntype.tsym,
4695 owntype.getMetadata());
4696 }
4697 }
4698 break;
4699 case VAR:
4700 VarSymbol v = (VarSymbol)sym;
4701
4702 if (env.info.enclVar != null
4703 && v.type.hasTag(NONE)) {
4704 //self reference to implicitly typed variable declaration
4705 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4706 return tree.type = v.type = types.createErrorType(v.type);
4707 }
4708
4709 // Test (4): if symbol is an instance field of a raw type,
4710 // which is being assigned to, issue an unchecked warning if
4711 // its type changes under erasure.
4712 if (KindSelector.ASG.subset(pkind()) &&
4713 v.owner.kind == TYP &&
4714 (v.flags() & STATIC) == 0 &&
4715 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4716 Type s = types.asOuterSuper(site, v.owner);
4717 if (s != null &&
4718 s.isRaw() &&
4719 !types.isSameType(v.type, v.erasure(types))) {
4720 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4721 }
4722 }
4723 // The computed type of a variable is the type of the
4724 // variable symbol, taken as a member of the site type.
4725 owntype = (sym.owner.kind == TYP &&
4726 sym.name != names._this && sym.name != names._super)
4727 ? types.memberType(site, sym)
4728 : sym.type;
4729
4730 // If the variable is a constant, record constant value in
4731 // computed type.
4732 if (v.getConstValue() != null && isStaticReference(tree))
4733 owntype = owntype.constType(v.getConstValue());
4734
4735 if (resultInfo.pkind == KindSelector.VAL) {
4736 owntype = capture(owntype); // capture "names as expressions"
4737 }
4738 break;
4739 case MTH: {
4740 owntype = checkMethod(site, sym,
4741 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4742 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4743 resultInfo.pt.getTypeArguments());
4744 chk.checkRestricted(tree.pos(), sym);
4745 break;
4746 }
4747 case PCK: case ERR:
4748 owntype = sym.type;
4749 break;
4750 default:
4751 throw new AssertionError("unexpected kind: " + sym.kind +
4752 " in tree " + tree);
4753 }
4754
4755 // Emit a `deprecation' warning if symbol is deprecated.
4756 // (for constructors (but not for constructor references), the error
4757 // was given when the constructor was resolved)
4758
4759 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4760 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4761 chk.checkSunAPI(tree.pos(), sym);
4762 chk.checkProfile(tree.pos(), sym);
4763 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4764 }
4765
4766 if (pt.isErroneous()) {
4767 owntype = types.createErrorType(owntype);
4768 }
4769
4770 // If symbol is a variable, check that its type and
4771 // kind are compatible with the prototype and protokind.
4772 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4773 }
4774
4775 /** Check that variable is initialized and evaluate the variable's
4776 * initializer, if not yet done. Also check that variable is not
4777 * referenced before it is defined.
4778 * @param tree The tree making up the variable reference.
4779 * @param env The current environment.
4780 * @param v The variable's symbol.
4781 */
4782 private void checkInit(JCTree tree,
4783 Env<AttrContext> env,
4784 VarSymbol v,
4785 boolean onlyWarning) {
4786 // A forward reference is diagnosed if the declaration position
4787 // of the variable is greater than the current tree position
4788 // and the tree and variable definition occur in the same class
4789 // definition. Note that writes don't count as references.
4790 // This check applies only to class and instance
4791 // variables. Local variables follow different scope rules,
4792 // and are subject to definite assignment checking.
4793 Env<AttrContext> initEnv = enclosingInitEnv(env);
4794 if (initEnv != null &&
4795 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4796 v.owner.kind == TYP &&
4797 v.owner == env.info.scope.owner.enclClass() &&
4798 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4799 (!env.tree.hasTag(ASSIGN) ||
4800 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4801 if (!onlyWarning || isStaticEnumField(v)) {
4802 Error errkey = (initEnv.info.enclVar == v) ?
4803 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4804 log.error(tree.pos(), errkey);
4805 } else if (useBeforeDeclarationWarning) {
4806 Warning warnkey = (initEnv.info.enclVar == v) ?
4807 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4808 log.warning(tree.pos(), warnkey);
4809 }
4810 }
4811
4812 v.getConstValue(); // ensure initializer is evaluated
4813
4814 checkEnumInitializer(tree, env, v);
4815 }
4816
4817 /**
4818 * Returns the enclosing init environment associated with this env (if any). An init env
4819 * can be either a field declaration env or a static/instance initializer env.
4820 */
4821 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4822 while (true) {
4823 switch (env.tree.getTag()) {
4824 case VARDEF:
4825 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4826 if (vdecl.sym.owner.kind == TYP) {
4827 //field
4828 return env;
4829 }
4830 break;
4831 case BLOCK:
4832 if (env.next.tree.hasTag(CLASSDEF)) {
4833 //instance/static initializer
4834 return env;
4835 }
4836 break;
4837 case METHODDEF:
4838 case CLASSDEF:
4839 case TOPLEVEL:
4840 return null;
4841 }
4842 Assert.checkNonNull(env.next);
4843 env = env.next;
4844 }
4845 }
4846
4847 /**
4848 * Check for illegal references to static members of enum. In
4849 * an enum type, constructors and initializers may not
4850 * reference its static members unless they are constant.
4851 *
4852 * @param tree The tree making up the variable reference.
4853 * @param env The current environment.
4854 * @param v The variable's symbol.
4855 * @jls 8.9 Enum Types
4856 */
4857 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4858 // JLS:
4859 //
4860 // "It is a compile-time error to reference a static field
4861 // of an enum type that is not a compile-time constant
4862 // (15.28) from constructors, instance initializer blocks,
4863 // or instance variable initializer expressions of that
4864 // type. It is a compile-time error for the constructors,
4865 // instance initializer blocks, or instance variable
4866 // initializer expressions of an enum constant e to refer
4867 // to itself or to an enum constant of the same type that
4868 // is declared to the right of e."
4869 if (isStaticEnumField(v)) {
4870 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4871
4872 if (enclClass == null || enclClass.owner == null)
4873 return;
4874
4875 // See if the enclosing class is the enum (or a
4876 // subclass thereof) declaring v. If not, this
4877 // reference is OK.
4878 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4879 return;
4880
4881 // If the reference isn't from an initializer, then
4882 // the reference is OK.
4883 if (!Resolve.isInitializer(env))
4884 return;
4885
4886 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4887 }
4888 }
4889
4890 /** Is the given symbol a static, non-constant field of an Enum?
4891 * Note: enum literals should not be regarded as such
4892 */
4893 private boolean isStaticEnumField(VarSymbol v) {
4894 return Flags.isEnum(v.owner) &&
4895 Flags.isStatic(v) &&
4896 !Flags.isConstant(v) &&
4897 v.name != names._class;
4898 }
4899
4900 /**
4901 * Check that method arguments conform to its instantiation.
4902 **/
4903 public Type checkMethod(Type site,
4904 final Symbol sym,
4905 ResultInfo resultInfo,
4906 Env<AttrContext> env,
4907 final List<JCExpression> argtrees,
4908 List<Type> argtypes,
4909 List<Type> typeargtypes) {
4910 // Test (5): if symbol is an instance method of a raw type, issue
4911 // an unchecked warning if its argument types change under erasure.
4912 if ((sym.flags() & STATIC) == 0 &&
4913 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4914 Type s = types.asOuterSuper(site, sym.owner);
4915 if (s != null && s.isRaw() &&
4916 !types.isSameTypes(sym.type.getParameterTypes(),
4917 sym.erasure(types).getParameterTypes())) {
4918 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
4919 }
4920 }
4921
4922 if (env.info.defaultSuperCallSite != null) {
4923 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4924 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4925 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4926 List<MethodSymbol> icand_sup =
4927 types.interfaceCandidates(sup, (MethodSymbol)sym);
4928 if (icand_sup.nonEmpty() &&
4929 icand_sup.head != sym &&
4930 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4931 log.error(env.tree.pos(),
4932 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4933 break;
4934 }
4935 }
4936 env.info.defaultSuperCallSite = null;
4937 }
4938
4939 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4940 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4941 if (app.meth.hasTag(SELECT) &&
4942 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4943 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4944 }
4945 }
4946
4947 // Compute the identifier's instantiated type.
4948 // For methods, we need to compute the instance type by
4949 // Resolve.instantiate from the symbol's type as well as
4950 // any type arguments and value arguments.
4951 Warner noteWarner = new Warner();
4952 try {
4953 Type owntype = rs.checkMethod(
4954 env,
4955 site,
4956 sym,
4957 resultInfo,
4958 argtypes,
4959 typeargtypes,
4960 noteWarner);
4961
4962 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4963 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4964
4965 argtypes = argtypes.map(checkDeferredMap);
4966
4967 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4968 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
4969 sym.name,
4970 rs.methodArguments(sym.type.getParameterTypes()),
4971 rs.methodArguments(argtypes.map(checkDeferredMap)),
4972 kindName(sym.location()),
4973 sym.location()));
4974 if (resultInfo.pt != Infer.anyPoly ||
4975 !owntype.hasTag(METHOD) ||
4976 !owntype.isPartial()) {
4977 //if this is not a partially inferred method type, erase return type. Otherwise,
4978 //erasure is carried out in PartiallyInferredMethodType.check().
4979 owntype = new MethodType(owntype.getParameterTypes(),
4980 types.erasure(owntype.getReturnType()),
4981 types.erasure(owntype.getThrownTypes()),
4982 syms.methodClass);
4983 }
4984 }
4985
4986 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4987 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4988 PolyKind.POLY : PolyKind.STANDALONE;
4989 TreeInfo.setPolyKind(env.tree, pkind);
4990
4991 return (resultInfo.pt == Infer.anyPoly) ?
4992 owntype :
4993 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4994 resultInfo.checkContext.inferenceContext());
4995 } catch (Infer.InferenceException ex) {
4996 //invalid target type - propagate exception outwards or report error
4997 //depending on the current check context
4998 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4999 return types.createErrorType(site);
5000 } catch (Resolve.InapplicableMethodException ex) {
5001 final JCDiagnostic diag = ex.getDiagnostic();
5002 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5003 @Override
5004 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5005 return new Pair<>(sym, diag);
5006 }
5007 };
5008 List<Type> argtypes2 = argtypes.map(
5009 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5010 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5011 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5012 log.report(errDiag);
5013 return types.createErrorType(site);
5014 }
5015 }
5016
5017 public void visitLiteral(JCLiteral tree) {
5018 result = check(tree, litType(tree.typetag).constType(tree.value),
5019 KindSelector.VAL, resultInfo);
5020 }
5021 //where
5022 /** Return the type of a literal with given type tag.
5023 */
5024 Type litType(TypeTag tag) {
5025 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5026 }
5027
5028 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5029 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5030 }
5031
5032 public void visitTypeArray(JCArrayTypeTree tree) {
5033 Type etype = attribType(tree.elemtype, env);
5034 Type type = new ArrayType(etype, syms.arrayClass);
5035 result = check(tree, type, KindSelector.TYP, resultInfo);
5036 }
5037
5038 /** Visitor method for parameterized types.
5039 * Bound checking is left until later, since types are attributed
5040 * before supertype structure is completely known
5041 */
5042 public void visitTypeApply(JCTypeApply tree) {
5043 Type owntype = types.createErrorType(tree.type);
5044
5045 // Attribute functor part of application and make sure it's a class.
5046 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5047
5048 // Attribute type parameters
5049 List<Type> actuals = attribTypes(tree.arguments, env);
5050
5051 if (clazztype.hasTag(CLASS)) {
5052 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5053 if (actuals.isEmpty()) //diamond
5054 actuals = formals;
5055
5056 if (actuals.length() == formals.length()) {
5057 List<Type> a = actuals;
5058 List<Type> f = formals;
5059 while (a.nonEmpty()) {
5060 a.head = a.head.withTypeVar(f.head);
5061 a = a.tail;
5062 f = f.tail;
5063 }
5064 // Compute the proper generic outer
5065 Type clazzOuter = clazztype.getEnclosingType();
5066 if (clazzOuter.hasTag(CLASS)) {
5067 Type site;
5068 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5069 if (clazz.hasTag(IDENT)) {
5070 site = env.enclClass.sym.type;
5071 } else if (clazz.hasTag(SELECT)) {
5072 site = ((JCFieldAccess) clazz).selected.type;
5073 } else throw new AssertionError(""+tree);
5074 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5075 if (site.hasTag(CLASS))
5076 site = types.asOuterSuper(site, clazzOuter.tsym);
5077 if (site == null)
5078 site = types.erasure(clazzOuter);
5079 clazzOuter = site;
5080 }
5081 }
5082 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5083 clazztype.getMetadata());
5084 } else {
5085 if (formals.length() != 0) {
5086 log.error(tree.pos(),
5087 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5088 } else {
5089 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5090 }
5091 owntype = types.createErrorType(tree.type);
5092 }
5093 } else if (clazztype.hasTag(ERROR)) {
5094 ErrorType parameterizedErroneous =
5095 new ErrorType(clazztype.getOriginalType(),
5096 clazztype.tsym,
5097 clazztype.getMetadata());
5098
5099 parameterizedErroneous.typarams_field = actuals;
5100 owntype = parameterizedErroneous;
5101 }
5102 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5103 }
5104
5105 public void visitTypeUnion(JCTypeUnion tree) {
5106 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5107 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5108 for (JCExpression typeTree : tree.alternatives) {
5109 Type ctype = attribType(typeTree, env);
5110 ctype = chk.checkType(typeTree.pos(),
5111 chk.checkClassType(typeTree.pos(), ctype),
5112 syms.throwableType);
5113 if (!ctype.isErroneous()) {
5114 //check that alternatives of a union type are pairwise
5115 //unrelated w.r.t. subtyping
5116 if (chk.intersects(ctype, multicatchTypes.toList())) {
5117 for (Type t : multicatchTypes) {
5118 boolean sub = types.isSubtype(ctype, t);
5119 boolean sup = types.isSubtype(t, ctype);
5120 if (sub || sup) {
5121 //assume 'a' <: 'b'
5122 Type a = sub ? ctype : t;
5123 Type b = sub ? t : ctype;
5124 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5125 }
5126 }
5127 }
5128 multicatchTypes.append(ctype);
5129 if (all_multicatchTypes != null)
5130 all_multicatchTypes.append(ctype);
5131 } else {
5132 if (all_multicatchTypes == null) {
5133 all_multicatchTypes = new ListBuffer<>();
5134 all_multicatchTypes.appendList(multicatchTypes);
5135 }
5136 all_multicatchTypes.append(ctype);
5137 }
5138 }
5139 Type t = check(tree, types.lub(multicatchTypes.toList()),
5140 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5141 if (t.hasTag(CLASS)) {
5142 List<Type> alternatives =
5143 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5144 t = new UnionClassType((ClassType) t, alternatives);
5145 }
5146 tree.type = result = t;
5147 }
5148
5149 public void visitTypeIntersection(JCTypeIntersection tree) {
5150 attribTypes(tree.bounds, env);
5151 tree.type = result = checkIntersection(tree, tree.bounds);
5152 }
5153
5154 public void visitTypeParameter(JCTypeParameter tree) {
5155 TypeVar typeVar = (TypeVar) tree.type;
5156
5157 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5158 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5159 }
5160
5161 if (!typeVar.getUpperBound().isErroneous()) {
5162 //fixup type-parameter bound computed in 'attribTypeVariables'
5163 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5164 }
5165 }
5166
5167 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5168 Set<Symbol> boundSet = new HashSet<>();
5169 if (bounds.nonEmpty()) {
5170 // accept class or interface or typevar as first bound.
5171 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5172 boundSet.add(types.erasure(bounds.head.type).tsym);
5173 if (bounds.head.type.isErroneous()) {
5174 return bounds.head.type;
5175 }
5176 else if (bounds.head.type.hasTag(TYPEVAR)) {
5177 // if first bound was a typevar, do not accept further bounds.
5178 if (bounds.tail.nonEmpty()) {
5179 log.error(bounds.tail.head.pos(),
5180 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5181 return bounds.head.type;
5182 }
5183 } else {
5184 // if first bound was a class or interface, accept only interfaces
5185 // as further bounds.
5186 for (JCExpression bound : bounds.tail) {
5187 bound.type = checkBase(bound.type, bound, env, false, true, false);
5188 if (bound.type.isErroneous()) {
5189 bounds = List.of(bound);
5190 }
5191 else if (bound.type.hasTag(CLASS)) {
5192 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5193 }
5194 }
5195 }
5196 }
5197
5198 if (bounds.length() == 0) {
5199 return syms.objectType;
5200 } else if (bounds.length() == 1) {
5201 return bounds.head.type;
5202 } else {
5203 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5204 // ... the variable's bound is a class type flagged COMPOUND
5205 // (see comment for TypeVar.bound).
5206 // In this case, generate a class tree that represents the
5207 // bound class, ...
5208 JCExpression extending;
5209 List<JCExpression> implementing;
5210 if (!bounds.head.type.isInterface()) {
5211 extending = bounds.head;
5212 implementing = bounds.tail;
5213 } else {
5214 extending = null;
5215 implementing = bounds;
5216 }
5217 JCClassDecl cd = make.at(tree).ClassDef(
5218 make.Modifiers(PUBLIC | ABSTRACT),
5219 names.empty, List.nil(),
5220 extending, implementing, List.nil());
5221
5222 ClassSymbol c = (ClassSymbol)owntype.tsym;
5223 Assert.check((c.flags() & COMPOUND) != 0);
5224 cd.sym = c;
5225 c.sourcefile = env.toplevel.sourcefile;
5226
5227 // ... and attribute the bound class
5228 c.flags_field |= UNATTRIBUTED;
5229 Env<AttrContext> cenv = enter.classEnv(cd, env);
5230 typeEnvs.put(c, cenv);
5231 attribClass(c);
5232 return owntype;
5233 }
5234 }
5235
5236 public void visitWildcard(JCWildcard tree) {
5237 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5238 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5239 ? syms.objectType
5240 : attribType(tree.inner, env);
5241 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5242 tree.kind.kind,
5243 syms.boundClass),
5244 KindSelector.TYP, resultInfo);
5245 }
5246
5247 public void visitAnnotation(JCAnnotation tree) {
5248 Assert.error("should be handled in annotate");
5249 }
5250
5251 @Override
5252 public void visitModifiers(JCModifiers tree) {
5253 //error recovery only:
5254 Assert.check(resultInfo.pkind == KindSelector.ERR);
5255
5256 attribAnnotationTypes(tree.annotations, env);
5257 }
5258
5259 public void visitAnnotatedType(JCAnnotatedType tree) {
5260 attribAnnotationTypes(tree.annotations, env);
5261 Type underlyingType = attribType(tree.underlyingType, env);
5262 Type annotatedType = underlyingType.preannotatedType();
5263
5264 if (!env.info.isAnonymousNewClass)
5265 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5266 result = tree.type = annotatedType;
5267 }
5268
5269 public void visitErroneous(JCErroneous tree) {
5270 if (tree.errs != null) {
5271 WriteableScope newScope = env.info.scope;
5272
5273 if (env.tree instanceof JCClassDecl) {
5274 Symbol fakeOwner =
5275 new MethodSymbol(BLOCK, names.empty, null,
5276 env.info.scope.owner);
5277 newScope = newScope.dupUnshared(fakeOwner);
5278 }
5279
5280 Env<AttrContext> errEnv =
5281 env.dup(env.tree,
5282 env.info.dup(newScope));
5283 errEnv.info.returnResult = unknownExprInfo;
5284 for (JCTree err : tree.errs)
5285 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5286 }
5287 result = tree.type = syms.errType;
5288 }
5289
5290 /** Default visitor method for all other trees.
5291 */
5292 public void visitTree(JCTree tree) {
5293 throw new AssertionError();
5294 }
5295
5296 /**
5297 * Attribute an env for either a top level tree or class or module declaration.
5298 */
5299 public void attrib(Env<AttrContext> env) {
5300 switch (env.tree.getTag()) {
5301 case MODULEDEF:
5302 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5303 break;
5304 case PACKAGEDEF:
5305 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5306 break;
5307 default:
5308 attribClass(env.tree.pos(), env.enclClass.sym);
5309 }
5310
5311 annotate.flush();
5312 }
5313
5314 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5315 try {
5316 annotate.flush();
5317 attribPackage(p);
5318 } catch (CompletionFailure ex) {
5319 chk.completionError(pos, ex);
5320 }
5321 }
5322
5323 void attribPackage(PackageSymbol p) {
5324 attribWithLint(p,
5325 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5326 }
5327
5328 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5329 try {
5330 annotate.flush();
5331 attribModule(m);
5332 } catch (CompletionFailure ex) {
5333 chk.completionError(pos, ex);
5334 }
5335 }
5336
5337 void attribModule(ModuleSymbol m) {
5338 attribWithLint(m, env -> attribStat(env.tree, env));
5339 }
5340
5341 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5342 Env<AttrContext> env = typeEnvs.get(sym);
5343
5344 Env<AttrContext> lintEnv = env;
5345 while (lintEnv.info.lint == null)
5346 lintEnv = lintEnv.next;
5347
5348 Lint lint = lintEnv.info.lint.augment(sym);
5349
5350 Lint prevLint = chk.setLint(lint);
5351 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5352
5353 try {
5354 deferredLintHandler.flush(env.tree, lint);
5355 attrib.accept(env);
5356 } finally {
5357 log.useSource(prev);
5358 chk.setLint(prevLint);
5359 }
5360 }
5361
5362 /** Main method: attribute class definition associated with given class symbol.
5363 * reporting completion failures at the given position.
5364 * @param pos The source position at which completion errors are to be
5365 * reported.
5366 * @param c The class symbol whose definition will be attributed.
5367 */
5368 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5369 try {
5370 annotate.flush();
5371 attribClass(c);
5372 } catch (CompletionFailure ex) {
5373 chk.completionError(pos, ex);
5374 }
5375 }
5376
5377 /** Attribute class definition associated with given class symbol.
5378 * @param c The class symbol whose definition will be attributed.
5379 */
5380 void attribClass(ClassSymbol c) throws CompletionFailure {
5381 if (c.type.hasTag(ERROR)) return;
5382
5383 // Check for cycles in the inheritance graph, which can arise from
5384 // ill-formed class files.
5385 chk.checkNonCyclic(null, c.type);
5386
5387 Type st = types.supertype(c.type);
5388 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5389 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5390 // First, attribute superclass.
5391 if (st.hasTag(CLASS))
5392 attribClass((ClassSymbol)st.tsym);
5393
5394 // Next attribute owner, if it is a class.
5395 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5396 attribClass((ClassSymbol)c.owner);
5397
5398 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5399 }
5400
5401 // The previous operations might have attributed the current class
5402 // if there was a cycle. So we test first whether the class is still
5403 // UNATTRIBUTED.
5404 if ((c.flags_field & UNATTRIBUTED) != 0) {
5405 c.flags_field &= ~UNATTRIBUTED;
5406
5407 // Get environment current at the point of class definition.
5408 Env<AttrContext> env = typeEnvs.get(c);
5409
5410 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5411 // because the annotations were not available at the time the env was created. Therefore,
5412 // we look up the environment chain for the first enclosing environment for which the
5413 // lint value is set. Typically, this is the parent env, but might be further if there
5414 // are any envs created as a result of TypeParameter nodes.
5415 Env<AttrContext> lintEnv = env;
5416 while (lintEnv.info.lint == null)
5417 lintEnv = lintEnv.next;
5418
5419 // Having found the enclosing lint value, we can initialize the lint value for this class
5420 env.info.lint = lintEnv.info.lint.augment(c);
5421
5422 Lint prevLint = chk.setLint(env.info.lint);
5423 JavaFileObject prev = log.useSource(c.sourcefile);
5424 ResultInfo prevReturnRes = env.info.returnResult;
5425
5426 try {
5427 if (c.isSealed() &&
5428 !c.isEnum() &&
5429 !c.isPermittedExplicit &&
5430 c.getPermittedSubclasses().isEmpty()) {
5431 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5432 }
5433
5434 if (c.isSealed()) {
5435 Set<Symbol> permittedTypes = new HashSet<>();
5436 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5437 for (Type subType : c.getPermittedSubclasses()) {
5438 if (subType.isErroneous()) {
5439 // the type already caused errors, don't produce more potentially misleading errors
5440 continue;
5441 }
5442 boolean isTypeVar = false;
5443 if (subType.getTag() == TYPEVAR) {
5444 isTypeVar = true; //error recovery
5445 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5446 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5447 }
5448 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5449 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5450 }
5451 if (permittedTypes.contains(subType.tsym)) {
5452 DiagnosticPosition pos =
5453 env.enclClass.permitting.stream()
5454 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5455 .limit(2).collect(List.collector()).get(1);
5456 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5457 } else {
5458 permittedTypes.add(subType.tsym);
5459 }
5460 if (sealedInUnnamed) {
5461 if (subType.tsym.packge() != c.packge()) {
5462 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5463 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5464 );
5465 }
5466 } else if (subType.tsym.packge().modle != c.packge().modle) {
5467 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5468 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5469 );
5470 }
5471 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5472 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5473 Errors.InvalidPermitsClause(
5474 subType.tsym == c.type.tsym ?
5475 Fragments.MustNotBeSameClass :
5476 Fragments.MustNotBeSupertype(subType)
5477 )
5478 );
5479 } else if (!isTypeVar) {
5480 boolean thisIsASuper = types.directSupertypes(subType)
5481 .stream()
5482 .anyMatch(d -> d.tsym == c);
5483 if (!thisIsASuper) {
5484 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5485 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5486 }
5487 }
5488 }
5489 }
5490
5491 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5492 .stream()
5493 .filter(s -> s.tsym.isSealed())
5494 .map(s -> (ClassSymbol) s.tsym)
5495 .collect(List.collector());
5496
5497 if (sealedSupers.isEmpty()) {
5498 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5499 boolean hasErrorSuper = false;
5500
5501 hasErrorSuper |= types.directSupertypes(c.type)
5502 .stream()
5503 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5504
5505 ClassType ct = (ClassType) c.type;
5506
5507 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5508
5509 if (!hasErrorSuper) {
5510 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5511 }
5512 }
5513 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5514 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5515 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5516 }
5517
5518 if (!c.type.isCompound()) {
5519 for (ClassSymbol supertypeSym : sealedSupers) {
5520 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5521 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5522 }
5523 }
5524 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5525 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5526 c.isInterface() ?
5527 Errors.NonSealedOrSealedExpected :
5528 Errors.NonSealedSealedOrFinalExpected);
5529 }
5530 }
5531 }
5532
5533 deferredLintHandler.flush(env.tree, env.info.lint);
5534 env.info.returnResult = null;
5535 // java.lang.Enum may not be subclassed by a non-enum
5536 if (st.tsym == syms.enumSym &&
5537 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5538 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5539
5540 // Enums may not be extended by source-level classes
5541 if (st.tsym != null &&
5542 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5543 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5544 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5545 }
5546
5547 if (rs.isSerializable(c.type)) {
5548 env.info.isSerializable = true;
5549 }
5550
5551 if (c.isValueClass()) {
5552 Assert.check(env.tree.hasTag(CLASSDEF));
5553 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5554 }
5555
5556 attribClassBody(env, c);
5557
5558 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5559 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5560 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5561 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5562
5563 if (c.isImplicit()) {
5564 chk.checkHasMain(env.tree.pos(), c);
5565 }
5566 } finally {
5567 env.info.returnResult = prevReturnRes;
5568 log.useSource(prev);
5569 chk.setLint(prevLint);
5570 }
5571
5572 }
5573 }
5574
5575 public void visitImport(JCImport tree) {
5576 // nothing to do
5577 }
5578
5579 public void visitModuleDef(JCModuleDecl tree) {
5580 tree.sym.completeUsesProvides();
5581 ModuleSymbol msym = tree.sym;
5582 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5583 Lint prevLint = chk.setLint(lint);
5584 chk.checkModuleName(tree);
5585 chk.checkDeprecatedAnnotation(tree, msym);
5586
5587 try {
5588 deferredLintHandler.flush(tree, lint);
5589 } finally {
5590 chk.setLint(prevLint);
5591 }
5592 }
5593
5594 /** Finish the attribution of a class. */
5595 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5596 JCClassDecl tree = (JCClassDecl)env.tree;
5597 Assert.check(c == tree.sym);
5598
5599 // Validate type parameters, supertype and interfaces.
5600 attribStats(tree.typarams, env);
5601 if (!c.isAnonymous()) {
5602 //already checked if anonymous
5603 chk.validate(tree.typarams, env);
5604 chk.validate(tree.extending, env);
5605 chk.validate(tree.implementing, env);
5606 }
5607
5608 c.markAbstractIfNeeded(types);
5609
5610 // If this is a non-abstract class, check that it has no abstract
5611 // methods or unimplemented methods of an implemented interface.
5612 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5613 chk.checkAllDefined(tree.pos(), c);
5614 }
5615
5616 if ((c.flags() & ANNOTATION) != 0) {
5617 if (tree.implementing.nonEmpty())
5618 log.error(tree.implementing.head.pos(),
5619 Errors.CantExtendIntfAnnotation);
5620 if (tree.typarams.nonEmpty()) {
5621 log.error(tree.typarams.head.pos(),
5622 Errors.IntfAnnotationCantHaveTypeParams(c));
5623 }
5624
5625 // If this annotation type has a @Repeatable, validate
5626 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5627 // If this annotation type has a @Repeatable, validate
5628 if (repeatable != null) {
5629 // get diagnostic position for error reporting
5630 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5631 Assert.checkNonNull(cbPos);
5632
5633 chk.validateRepeatable(c, repeatable, cbPos);
5634 }
5635 } else {
5636 // Check that all extended classes and interfaces
5637 // are compatible (i.e. no two define methods with same arguments
5638 // yet different return types). (JLS 8.4.8.3)
5639 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5640 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5641 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5642 }
5643
5644 // Check that class does not import the same parameterized interface
5645 // with two different argument lists.
5646 chk.checkClassBounds(tree.pos(), c.type);
5647
5648 tree.type = c.type;
5649
5650 for (List<JCTypeParameter> l = tree.typarams;
5651 l.nonEmpty(); l = l.tail) {
5652 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5653 }
5654
5655 // Check that a generic class doesn't extend Throwable
5656 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5657 log.error(tree.extending.pos(), Errors.GenericThrowable);
5658
5659 // Check that all methods which implement some
5660 // method conform to the method they implement.
5661 chk.checkImplementations(tree);
5662
5663 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5664 checkAutoCloseable(tree.pos(), env, c.type);
5665
5666 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5667 // Attribute declaration
5668 attribStat(l.head, env);
5669 // Check that declarations in inner classes are not static (JLS 8.1.2)
5670 // Make an exception for static constants.
5671 if (!allowRecords &&
5672 c.owner.kind != PCK &&
5673 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5674 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5675 VarSymbol sym = null;
5676 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5677 if (sym == null ||
5678 sym.kind != VAR ||
5679 sym.getConstValue() == null)
5680 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5681 }
5682 }
5683
5684 // Check for proper placement of super()/this() calls.
5685 chk.checkSuperInitCalls(tree);
5686
5687 // Check for cycles among non-initial constructors.
5688 chk.checkCyclicConstructors(tree);
5689
5690 // Check for cycles among annotation elements.
5691 chk.checkNonCyclicElements(tree);
5692
5693 // Check for proper use of serialVersionUID and other
5694 // serialization-related fields and methods
5695 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5696 && rs.isSerializable(c.type)
5697 && !c.isAnonymous()) {
5698 chk.checkSerialStructure(env, tree, c);
5699 }
5700 // Correctly organize the positions of the type annotations
5701 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5702
5703 // Check type annotations applicability rules
5704 validateTypeAnnotations(tree, false);
5705 }
5706 // where
5707 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5708 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5709 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5710 if (types.isSameType(al.head.annotationType.type, t))
5711 return al.head.pos();
5712 }
5713
5714 return null;
5715 }
5716
5717 private Type capture(Type type) {
5718 return types.capture(type);
5719 }
5720
5721 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5722 if (type.isErroneous()) {
5723 tree.vartype = make.at(Position.NOPOS).Erroneous();
5724 } else {
5725 tree.vartype = make.at(Position.NOPOS).Type(type);
5726 }
5727 }
5728
5729 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5730 tree.accept(new TypeAnnotationsValidator(sigOnly));
5731 }
5732 //where
5733 private final class TypeAnnotationsValidator extends TreeScanner {
5734
5735 private final boolean sigOnly;
5736 public TypeAnnotationsValidator(boolean sigOnly) {
5737 this.sigOnly = sigOnly;
5738 }
5739
5740 public void visitAnnotation(JCAnnotation tree) {
5741 chk.validateTypeAnnotation(tree, null, false);
5742 super.visitAnnotation(tree);
5743 }
5744 public void visitAnnotatedType(JCAnnotatedType tree) {
5745 if (!tree.underlyingType.type.isErroneous()) {
5746 super.visitAnnotatedType(tree);
5747 }
5748 }
5749 public void visitTypeParameter(JCTypeParameter tree) {
5750 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5751 scan(tree.bounds);
5752 // Don't call super.
5753 // This is needed because above we call validateTypeAnnotation with
5754 // false, which would forbid annotations on type parameters.
5755 // super.visitTypeParameter(tree);
5756 }
5757 public void visitMethodDef(JCMethodDecl tree) {
5758 if (tree.recvparam != null &&
5759 !tree.recvparam.vartype.type.isErroneous()) {
5760 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5761 }
5762 if (tree.restype != null && tree.restype.type != null) {
5763 validateAnnotatedType(tree.restype, tree.restype.type);
5764 }
5765 if (sigOnly) {
5766 scan(tree.mods);
5767 scan(tree.restype);
5768 scan(tree.typarams);
5769 scan(tree.recvparam);
5770 scan(tree.params);
5771 scan(tree.thrown);
5772 } else {
5773 scan(tree.defaultValue);
5774 scan(tree.body);
5775 }
5776 }
5777 public void visitVarDef(final JCVariableDecl tree) {
5778 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5779 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5780 validateAnnotatedType(tree.vartype, tree.sym.type);
5781 scan(tree.mods);
5782 scan(tree.vartype);
5783 if (!sigOnly) {
5784 scan(tree.init);
5785 }
5786 }
5787 public void visitTypeCast(JCTypeCast tree) {
5788 if (tree.clazz != null && tree.clazz.type != null)
5789 validateAnnotatedType(tree.clazz, tree.clazz.type);
5790 super.visitTypeCast(tree);
5791 }
5792 public void visitTypeTest(JCInstanceOf tree) {
5793 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5794 validateAnnotatedType(tree.pattern, tree.pattern.type);
5795 super.visitTypeTest(tree);
5796 }
5797 public void visitNewClass(JCNewClass tree) {
5798 if (tree.clazz != null && tree.clazz.type != null) {
5799 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5800 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5801 tree.clazz.type.tsym);
5802 }
5803 if (tree.def != null) {
5804 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5805 }
5806
5807 validateAnnotatedType(tree.clazz, tree.clazz.type);
5808 }
5809 super.visitNewClass(tree);
5810 }
5811 public void visitNewArray(JCNewArray tree) {
5812 if (tree.elemtype != null && tree.elemtype.type != null) {
5813 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5814 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5815 tree.elemtype.type.tsym);
5816 }
5817 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5818 }
5819 super.visitNewArray(tree);
5820 }
5821 public void visitClassDef(JCClassDecl tree) {
5822 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5823 if (sigOnly) {
5824 scan(tree.mods);
5825 scan(tree.typarams);
5826 scan(tree.extending);
5827 scan(tree.implementing);
5828 }
5829 for (JCTree member : tree.defs) {
5830 if (member.hasTag(Tag.CLASSDEF)) {
5831 continue;
5832 }
5833 scan(member);
5834 }
5835 }
5836 public void visitBlock(JCBlock tree) {
5837 if (!sigOnly) {
5838 scan(tree.stats);
5839 }
5840 }
5841
5842 /* I would want to model this after
5843 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5844 * and override visitSelect and visitTypeApply.
5845 * However, we only set the annotated type in the top-level type
5846 * of the symbol.
5847 * Therefore, we need to override each individual location where a type
5848 * can occur.
5849 */
5850 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5851 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5852
5853 if (type.isPrimitiveOrVoid()) {
5854 return;
5855 }
5856
5857 JCTree enclTr = errtree;
5858 Type enclTy = type;
5859
5860 boolean repeat = true;
5861 while (repeat) {
5862 if (enclTr.hasTag(TYPEAPPLY)) {
5863 List<Type> tyargs = enclTy.getTypeArguments();
5864 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5865 if (trargs.length() > 0) {
5866 // Nothing to do for diamonds
5867 if (tyargs.length() == trargs.length()) {
5868 for (int i = 0; i < tyargs.length(); ++i) {
5869 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5870 }
5871 }
5872 // If the lengths don't match, it's either a diamond
5873 // or some nested type that redundantly provides
5874 // type arguments in the tree.
5875 }
5876
5877 // Look at the clazz part of a generic type
5878 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5879 }
5880
5881 if (enclTr.hasTag(SELECT)) {
5882 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5883 if (enclTy != null &&
5884 !enclTy.hasTag(NONE)) {
5885 enclTy = enclTy.getEnclosingType();
5886 }
5887 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5888 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5889 if (enclTy == null || enclTy.hasTag(NONE)) {
5890 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5891 for (JCAnnotation an : at.getAnnotations()) {
5892 if (chk.isTypeAnnotation(an, false)) {
5893 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5894 }
5895 }
5896 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5897 if (!onlyTypeAnnotations.isEmpty()) {
5898 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5899 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5900 Fragments.TypeAnnotation(onlyTypeAnnotations);
5901 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5902 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5903 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5904 type.tsym.owner, annotatedType));
5905 }
5906 repeat = false;
5907 }
5908 enclTr = at.underlyingType;
5909 // enclTy doesn't need to be changed
5910 } else if (enclTr.hasTag(IDENT)) {
5911 repeat = false;
5912 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5913 JCWildcard wc = (JCWildcard) enclTr;
5914 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5915 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5916 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5917 } else {
5918 // Nothing to do for UNBOUND
5919 }
5920 repeat = false;
5921 } else if (enclTr.hasTag(TYPEARRAY)) {
5922 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5923 validateAnnotatedType(art.getType(), art.elemtype.type);
5924 repeat = false;
5925 } else if (enclTr.hasTag(TYPEUNION)) {
5926 JCTypeUnion ut = (JCTypeUnion) enclTr;
5927 for (JCTree t : ut.getTypeAlternatives()) {
5928 validateAnnotatedType(t, t.type);
5929 }
5930 repeat = false;
5931 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5932 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5933 for (JCTree t : it.getBounds()) {
5934 validateAnnotatedType(t, t.type);
5935 }
5936 repeat = false;
5937 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5938 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5939 repeat = false;
5940 } else {
5941 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5942 " within: "+ errtree + " with kind: " + errtree.getKind());
5943 }
5944 }
5945 }
5946
5947 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5948 Symbol sym) {
5949 // Ensure that no declaration annotations are present.
5950 // Note that a tree type might be an AnnotatedType with
5951 // empty annotations, if only declaration annotations were given.
5952 // This method will raise an error for such a type.
5953 for (JCAnnotation ai : annotations) {
5954 if (!ai.type.isErroneous() &&
5955 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5956 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5957 }
5958 }
5959 }
5960 }
5961
5962 // <editor-fold desc="post-attribution visitor">
5963
5964 /**
5965 * Handle missing types/symbols in an AST. This routine is useful when
5966 * the compiler has encountered some errors (which might have ended up
5967 * terminating attribution abruptly); if the compiler is used in fail-over
5968 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5969 * prevents NPE to be propagated during subsequent compilation steps.
5970 */
5971 public void postAttr(JCTree tree) {
5972 new PostAttrAnalyzer().scan(tree);
5973 }
5974
5975 class PostAttrAnalyzer extends TreeScanner {
5976
5977 private void initTypeIfNeeded(JCTree that) {
5978 if (that.type == null) {
5979 if (that.hasTag(METHODDEF)) {
5980 that.type = dummyMethodType((JCMethodDecl)that);
5981 } else {
5982 that.type = syms.unknownType;
5983 }
5984 }
5985 }
5986
5987 /* Construct a dummy method type. If we have a method declaration,
5988 * and the declared return type is void, then use that return type
5989 * instead of UNKNOWN to avoid spurious error messages in lambda
5990 * bodies (see:JDK-8041704).
5991 */
5992 private Type dummyMethodType(JCMethodDecl md) {
5993 Type restype = syms.unknownType;
5994 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5995 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5996 if (prim.typetag == VOID)
5997 restype = syms.voidType;
5998 }
5999 return new MethodType(List.nil(), restype,
6000 List.nil(), syms.methodClass);
6001 }
6002 private Type dummyMethodType() {
6003 return dummyMethodType(null);
6004 }
6005
6006 @Override
6007 public void scan(JCTree tree) {
6008 if (tree == null) return;
6009 if (tree instanceof JCExpression) {
6010 initTypeIfNeeded(tree);
6011 }
6012 super.scan(tree);
6013 }
6014
6015 @Override
6016 public void visitIdent(JCIdent that) {
6017 if (that.sym == null) {
6018 that.sym = syms.unknownSymbol;
6019 }
6020 }
6021
6022 @Override
6023 public void visitSelect(JCFieldAccess that) {
6024 if (that.sym == null) {
6025 that.sym = syms.unknownSymbol;
6026 }
6027 super.visitSelect(that);
6028 }
6029
6030 @Override
6031 public void visitClassDef(JCClassDecl that) {
6032 initTypeIfNeeded(that);
6033 if (that.sym == null) {
6034 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6035 }
6036 super.visitClassDef(that);
6037 }
6038
6039 @Override
6040 public void visitMethodDef(JCMethodDecl that) {
6041 initTypeIfNeeded(that);
6042 if (that.sym == null) {
6043 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6044 }
6045 super.visitMethodDef(that);
6046 }
6047
6048 @Override
6049 public void visitVarDef(JCVariableDecl that) {
6050 initTypeIfNeeded(that);
6051 if (that.sym == null) {
6052 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6053 that.sym.adr = 0;
6054 }
6055 if (that.vartype == null) {
6056 that.vartype = make.at(Position.NOPOS).Erroneous();
6057 }
6058 super.visitVarDef(that);
6059 }
6060
6061 @Override
6062 public void visitBindingPattern(JCBindingPattern that) {
6063 initTypeIfNeeded(that);
6064 initTypeIfNeeded(that.var);
6065 if (that.var.sym == null) {
6066 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6067 that.var.sym.adr = 0;
6068 }
6069 super.visitBindingPattern(that);
6070 }
6071
6072 @Override
6073 public void visitRecordPattern(JCRecordPattern that) {
6074 initTypeIfNeeded(that);
6075 if (that.record == null) {
6076 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6077 that.type, syms.noSymbol);
6078 }
6079 if (that.fullComponentTypes == null) {
6080 that.fullComponentTypes = List.nil();
6081 }
6082 super.visitRecordPattern(that);
6083 }
6084
6085 @Override
6086 public void visitNewClass(JCNewClass that) {
6087 if (that.constructor == null) {
6088 that.constructor = new MethodSymbol(0, names.init,
6089 dummyMethodType(), syms.noSymbol);
6090 }
6091 if (that.constructorType == null) {
6092 that.constructorType = syms.unknownType;
6093 }
6094 super.visitNewClass(that);
6095 }
6096
6097 @Override
6098 public void visitAssignop(JCAssignOp that) {
6099 if (that.operator == null) {
6100 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6101 -1, syms.noSymbol);
6102 }
6103 super.visitAssignop(that);
6104 }
6105
6106 @Override
6107 public void visitBinary(JCBinary that) {
6108 if (that.operator == null) {
6109 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6110 -1, syms.noSymbol);
6111 }
6112 super.visitBinary(that);
6113 }
6114
6115 @Override
6116 public void visitUnary(JCUnary that) {
6117 if (that.operator == null) {
6118 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6119 -1, syms.noSymbol);
6120 }
6121 super.visitUnary(that);
6122 }
6123
6124 @Override
6125 public void visitReference(JCMemberReference that) {
6126 super.visitReference(that);
6127 if (that.sym == null) {
6128 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6129 syms.noSymbol);
6130 }
6131 }
6132 }
6133 // </editor-fold>
6134
6135 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6136 new TreeScanner() {
6137 Symbol packge = pkg;
6138 @Override
6139 public void visitIdent(JCIdent that) {
6140 that.sym = packge;
6141 }
6142
6143 @Override
6144 public void visitSelect(JCFieldAccess that) {
6145 that.sym = packge;
6146 packge = packge.owner;
6147 super.visitSelect(that);
6148 }
6149 }.scan(pid);
6150 }
6151
6152 }