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