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