1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Type.ClassType.Flavor;
49 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
50 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
51 import com.sun.tools.javac.comp.Check.CheckContext;
52 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
53 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
54 import com.sun.tools.javac.jvm.*;
55
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
59
60 import com.sun.tools.javac.resources.CompilerProperties.Errors;
61 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
62 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
63 import com.sun.tools.javac.tree.*;
64 import com.sun.tools.javac.tree.JCTree.*;
65 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
66 import com.sun.tools.javac.util.*;
67 import com.sun.tools.javac.util.DefinedBy.Api;
68 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
69 import com.sun.tools.javac.util.JCDiagnostic.Error;
70 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
71 import com.sun.tools.javac.util.JCDiagnostic.Warning;
72 import com.sun.tools.javac.util.List;
73
74 import static com.sun.tools.javac.code.Flags.*;
75 import static com.sun.tools.javac.code.Flags.ANNOTATION;
76 import static com.sun.tools.javac.code.Flags.BLOCK;
77 import static com.sun.tools.javac.code.Kinds.*;
78 import static com.sun.tools.javac.code.Kinds.Kind.*;
79 import static com.sun.tools.javac.code.TypeTag.*;
80 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
81 import static com.sun.tools.javac.tree.JCTree.Tag.*;
82 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final Symtab syms;
103 final Resolve rs;
104 final Operators operators;
105 final Infer infer;
106 final Analyzer analyzer;
107 final DeferredAttr deferredAttr;
108 final Check chk;
109 final Flow flow;
110 final MemberEnter memberEnter;
111 final TypeEnter typeEnter;
112 final TreeMaker make;
113 final ConstFold cfolder;
114 final Enter enter;
115 final Target target;
116 final Types types;
117 final Preview preview;
118 final JCDiagnostic.Factory diags;
119 final TypeAnnotations typeAnnotations;
120 final DeferredLintHandler deferredLintHandler;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127
128 public static Attr instance(Context context) {
129 Attr instance = context.get(attrKey);
130 if (instance == null)
131 instance = new Attr(context);
132 return instance;
133 }
134
135 @SuppressWarnings("this-escape")
136 protected Attr(Context context) {
137 context.put(attrKey, this);
138
139 names = Names.instance(context);
140 log = Log.instance(context);
141 syms = Symtab.instance(context);
142 rs = Resolve.instance(context);
143 operators = Operators.instance(context);
144 chk = Check.instance(context);
145 flow = Flow.instance(context);
146 memberEnter = MemberEnter.instance(context);
147 typeEnter = TypeEnter.instance(context);
148 make = TreeMaker.instance(context);
149 enter = Enter.instance(context);
150 infer = Infer.instance(context);
151 analyzer = Analyzer.instance(context);
152 deferredAttr = DeferredAttr.instance(context);
153 cfolder = ConstFold.instance(context);
154 target = Target.instance(context);
155 types = Types.instance(context);
156 preview = Preview.instance(context);
157 diags = JCDiagnostic.Factory.instance(context);
158 annotate = Annotate.instance(context);
159 typeAnnotations = TypeAnnotations.instance(context);
160 deferredLintHandler = DeferredLintHandler.instance(context);
161 typeEnvs = TypeEnvs.instance(context);
162 dependencies = Dependencies.instance(context);
163 argumentAttr = ArgumentAttr.instance(context);
164 matchBindingsComputer = MatchBindingsComputer.instance(context);
165 attrRecover = AttrRecover.instance(context);
166
167 Options options = Options.instance(context);
168
169 Source source = Source.instance(context);
170 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source) && options.isSet("enablePrimitiveClasses");
171 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
172 allowRecords = Feature.RECORDS.allowedInSource(source);
173 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
174 Feature.PATTERN_SWITCH.allowedInSource(source);
175 allowUnconditionalPatternsInstanceOf =
176 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
177 sourceName = source.name;
178 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
179
180 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
181 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
182 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
183 methodAttrInfo = new MethodAttrInfo();
184 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
185 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
186 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
187 }
188
189 /** Switch: allow primitive classes ?
190 */
191 boolean allowPrimitiveClasses;
192
193 /** Switch: reifiable types in instanceof enabled?
194 */
195 boolean allowReifiableTypesInInstanceof;
196
197 /** Are records allowed
198 */
199 private final boolean allowRecords;
200
201 /** Are patterns in switch allowed
202 */
203 private final boolean allowPatternSwitch;
204
205 /** Are unconditional patterns in instanceof allowed
206 */
207 private final boolean allowUnconditionalPatternsInstanceOf;
208
209 /**
210 * Switch: warn about use of variable before declaration?
211 * RFE: 6425594
212 */
213 boolean useBeforeDeclarationWarning;
214
215 /**
216 * Switch: name of source level; used for error reporting.
217 */
218 String sourceName;
219
220 /** Check kind and type of given tree against protokind and prototype.
221 * If check succeeds, store type in tree and return it.
222 * If check fails, store errType in tree and return it.
223 * No checks are performed if the prototype is a method type.
224 * It is not necessary in this case since we know that kind and type
225 * are correct.
226 *
227 * @param tree The tree whose kind and type is checked
228 * @param found The computed type of the tree
229 * @param ownkind The computed kind of the tree
230 * @param resultInfo The expected result of the tree
231 */
232 Type check(final JCTree tree,
233 final Type found,
234 final KindSelector ownkind,
235 final ResultInfo resultInfo) {
236 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
237 Type owntype;
238 boolean shouldCheck = !found.hasTag(ERROR) &&
239 !resultInfo.pt.hasTag(METHOD) &&
240 !resultInfo.pt.hasTag(FORALL);
241 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
242 log.error(tree.pos(),
243 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
244 ownkind.kindNames()));
245 owntype = types.createErrorType(found);
246 } else if (inferenceContext.free(found)) {
247 //delay the check if there are inference variables in the found type
248 //this means we are dealing with a partially inferred poly expression
249 owntype = shouldCheck ? resultInfo.pt : found;
250 if (resultInfo.checkMode.installPostInferenceHook()) {
251 inferenceContext.addFreeTypeListener(List.of(found),
252 instantiatedContext -> {
253 ResultInfo pendingResult =
254 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
255 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
256 });
257 }
258 } else {
259 owntype = shouldCheck ?
260 resultInfo.check(tree, found) :
261 found;
262 }
263 if (resultInfo.checkMode.updateTreeType()) {
264 tree.type = owntype;
265 }
266 return owntype;
267 }
268
269 /** Is given blank final variable assignable, i.e. in a scope where it
270 * may be assigned to even though it is final?
271 * @param v The blank final variable.
272 * @param env The current environment.
273 */
274 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
275 Symbol owner = env.info.scope.owner;
276 // owner refers to the innermost variable, method or
277 // initializer block declaration at this point.
278 boolean isAssignable =
279 v.owner == owner
280 ||
281 ((names.isInitOrVNew(owner.name) || // i.e. we are in a constructor
282 owner.kind == VAR || // i.e. we are in a variable initializer
283 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
284 &&
285 v.owner == owner.owner
286 &&
287 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
288 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
289 return isAssignable & !insideCompactConstructor;
290 }
291
292 /** Check that variable can be assigned to.
293 * @param pos The current source code position.
294 * @param v The assigned variable
295 * @param base If the variable is referred to in a Select, the part
296 * to the left of the `.', null otherwise.
297 * @param env The current environment.
298 */
299 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
300 if (v.name == names._this) {
301 log.error(pos, Errors.CantAssignValToThis);
302 } else if ((v.flags() & FINAL) != 0 &&
303 ((v.flags() & HASINIT) != 0
304 ||
305 !((base == null ||
306 TreeInfo.isThisQualifier(base)) &&
307 isAssignableAsBlankFinal(v, env)))) {
308 if (v.isResourceVariable()) { //TWR resource
309 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
310 } else {
311 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
312 }
313 }
314 }
315
316 /** Does tree represent a static reference to an identifier?
317 * It is assumed that tree is either a SELECT or an IDENT.
318 * We have to weed out selects from non-type names here.
319 * @param tree The candidate tree.
320 */
321 boolean isStaticReference(JCTree tree) {
322 if (tree.hasTag(SELECT)) {
323 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
324 if (lsym == null || lsym.kind != TYP) {
325 return false;
326 }
327 }
328 return true;
329 }
330
331 /** Is this symbol a type?
332 */
333 static boolean isType(Symbol sym) {
334 return sym != null && sym.kind == TYP;
335 }
336
337 /** The current `this' symbol.
338 * @param env The current environment.
339 */
340 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
341 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
342 }
343
344 /** Attribute a parsed identifier.
345 * @param tree Parsed identifier name
346 * @param topLevel The toplevel to use
347 */
348 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
349 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
350 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
351 syms.errSymbol.name,
352 null, null, null, null);
353 localEnv.enclClass.sym = syms.errSymbol;
354 return attribIdent(tree, localEnv);
355 }
356
357 /** Attribute a parsed identifier.
358 * @param tree Parsed identifier name
359 * @param env The env to use
360 */
361 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
362 return tree.accept(identAttributer, env);
363 }
364 // where
365 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
366 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
367 @Override @DefinedBy(Api.COMPILER_TREE)
368 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
369 Symbol site = visit(node.getExpression(), env);
370 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
371 return site;
372 Name name = (Name)node.getIdentifier();
373 if (site.kind == PCK) {
374 env.toplevel.packge = (PackageSymbol)site;
375 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
376 KindSelector.TYP_PCK);
377 } else {
378 env.enclClass.sym = (ClassSymbol)site;
379 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
380 }
381 }
382
383 @Override @DefinedBy(Api.COMPILER_TREE)
384 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
385 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
386 }
387 }
388
389 public Type coerce(Type etype, Type ttype) {
390 return cfolder.coerce(etype, ttype);
391 }
392
393 public Type attribType(JCTree node, TypeSymbol sym) {
394 Env<AttrContext> env = typeEnvs.get(sym);
395 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
396 return attribTree(node, localEnv, unknownTypeInfo);
397 }
398
399 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
400 // Attribute qualifying package or class.
401 JCFieldAccess s = tree.qualid;
402 return attribTree(s.selected, env,
403 new ResultInfo(tree.staticImport ?
404 KindSelector.TYP : KindSelector.TYP_PCK,
405 Type.noType));
406 }
407
408 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
409 return attribToTree(expr, env, tree, unknownExprInfo);
410 }
411
412 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
413 return attribToTree(stmt, env, tree, statInfo);
414 }
415
416 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
417 breakTree = tree;
418 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
419 try {
420 deferredAttr.attribSpeculative(root, env, resultInfo,
421 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
422 argumentAttr.withLocalCacheContext());
423 attrRecover.doRecovery();
424 } catch (BreakAttr b) {
425 return b.env;
426 } catch (AssertionError ae) {
427 if (ae.getCause() instanceof BreakAttr breakAttr) {
428 return breakAttr.env;
429 } else {
430 throw ae;
431 }
432 } finally {
433 breakTree = null;
434 log.useSource(prev);
435 }
436 return env;
437 }
438
439 private JCTree breakTree = null;
440
441 private static class BreakAttr extends RuntimeException {
442 static final long serialVersionUID = -6924771130405446405L;
443 private transient Env<AttrContext> env;
444 private BreakAttr(Env<AttrContext> env) {
445 this.env = env;
446 }
447 }
448
449 /**
450 * Mode controlling behavior of Attr.Check
451 */
452 enum CheckMode {
453
454 NORMAL,
455
456 /**
457 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
458 * that the captured var cache in {@code InferenceContext} will be used in read-only
459 * mode when performing inference checks.
460 */
461 NO_TREE_UPDATE {
462 @Override
463 public boolean updateTreeType() {
464 return false;
465 }
466 },
467 /**
468 * Mode signalling that caller will manage free types in tree decorations.
469 */
470 NO_INFERENCE_HOOK {
471 @Override
472 public boolean installPostInferenceHook() {
473 return false;
474 }
475 };
476
477 public boolean updateTreeType() {
478 return true;
479 }
480 public boolean installPostInferenceHook() {
481 return true;
482 }
483 }
484
485
486 class ResultInfo {
487 final KindSelector pkind;
488 final Type pt;
489 final CheckContext checkContext;
490 final CheckMode checkMode;
491
492 ResultInfo(KindSelector pkind, Type pt) {
493 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
494 }
495
496 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
497 this(pkind, pt, chk.basicHandler, checkMode);
498 }
499
500 protected ResultInfo(KindSelector pkind,
501 Type pt, CheckContext checkContext) {
502 this(pkind, pt, checkContext, CheckMode.NORMAL);
503 }
504
505 protected ResultInfo(KindSelector pkind,
506 Type pt, CheckContext checkContext, CheckMode checkMode) {
507 this.pkind = pkind;
508 this.pt = pt;
509 this.checkContext = checkContext;
510 this.checkMode = checkMode;
511 }
512
513 /**
514 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
515 * @param tree The tree to be type-checked.
516 * @return true if {@code ArgumentAttr} should be used.
517 */
518 protected boolean needsArgumentAttr(JCTree tree) { return false; }
519
520 protected Type check(final DiagnosticPosition pos, final Type found) {
521 return chk.checkType(pos, found, pt, checkContext);
522 }
523
524 protected ResultInfo dup(Type newPt) {
525 return new ResultInfo(pkind, newPt, checkContext, checkMode);
526 }
527
528 protected ResultInfo dup(CheckContext newContext) {
529 return new ResultInfo(pkind, pt, newContext, checkMode);
530 }
531
532 protected ResultInfo dup(Type newPt, CheckContext newContext) {
533 return new ResultInfo(pkind, newPt, newContext, checkMode);
534 }
535
536 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
537 return new ResultInfo(pkind, newPt, newContext, newMode);
538 }
539
540 protected ResultInfo dup(CheckMode newMode) {
541 return new ResultInfo(pkind, pt, checkContext, newMode);
542 }
543
544 @Override
545 public String toString() {
546 if (pt != null) {
547 return pt.toString();
548 } else {
549 return "";
550 }
551 }
552 }
553
554 class MethodAttrInfo extends ResultInfo {
555 public MethodAttrInfo() {
556 this(chk.basicHandler);
557 }
558
559 public MethodAttrInfo(CheckContext checkContext) {
560 super(KindSelector.VAL, Infer.anyPoly, checkContext);
561 }
562
563 @Override
564 protected boolean needsArgumentAttr(JCTree tree) {
565 return true;
566 }
567
568 protected ResultInfo dup(Type newPt) {
569 throw new IllegalStateException();
570 }
571
572 protected ResultInfo dup(CheckContext newContext) {
573 return new MethodAttrInfo(newContext);
574 }
575
576 protected ResultInfo dup(Type newPt, CheckContext newContext) {
577 throw new IllegalStateException();
578 }
579
580 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
581 throw new IllegalStateException();
582 }
583
584 protected ResultInfo dup(CheckMode newMode) {
585 throw new IllegalStateException();
586 }
587 }
588
589 class RecoveryInfo extends ResultInfo {
590
591 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
592 this(deferredAttrContext, Type.recoveryType);
593 }
594
595 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
596 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
597 @Override
598 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
599 return deferredAttrContext;
600 }
601 @Override
602 public boolean compatible(Type found, Type req, Warner warn) {
603 return true;
604 }
605 @Override
606 public void report(DiagnosticPosition pos, JCDiagnostic details) {
607 boolean needsReport = pt == Type.recoveryType ||
608 (details.getDiagnosticPosition() != null &&
609 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
610 if (needsReport) {
611 chk.basicHandler.report(pos, details);
612 }
613 }
614 });
615 }
616 }
617
618 final ResultInfo statInfo;
619 final ResultInfo varAssignmentInfo;
620 final ResultInfo methodAttrInfo;
621 final ResultInfo unknownExprInfo;
622 final ResultInfo unknownTypeInfo;
623 final ResultInfo unknownTypeExprInfo;
624 final ResultInfo recoveryInfo;
625
626 Type pt() {
627 return resultInfo.pt;
628 }
629
630 KindSelector pkind() {
631 return resultInfo.pkind;
632 }
633
634 /* ************************************************************************
635 * Visitor methods
636 *************************************************************************/
637
638 /** Visitor argument: the current environment.
639 */
640 Env<AttrContext> env;
641
642 /** Visitor argument: the currently expected attribution result.
643 */
644 ResultInfo resultInfo;
645
646 /** Visitor result: the computed type.
647 */
648 Type result;
649
650 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
651
652 /** Visitor method: attribute a tree, catching any completion failure
653 * exceptions. Return the tree's type.
654 *
655 * @param tree The tree to be visited.
656 * @param env The environment visitor argument.
657 * @param resultInfo The result info visitor argument.
658 */
659 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
660 Env<AttrContext> prevEnv = this.env;
661 ResultInfo prevResult = this.resultInfo;
662 try {
663 this.env = env;
664 this.resultInfo = resultInfo;
665 if (resultInfo.needsArgumentAttr(tree)) {
666 result = argumentAttr.attribArg(tree, env);
667 } else {
668 tree.accept(this);
669 }
670 matchBindings = matchBindingsComputer.finishBindings(tree,
671 matchBindings);
672 if (tree == breakTree &&
673 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
674 breakTreeFound(copyEnv(env));
675 }
676 return result;
677 } catch (CompletionFailure ex) {
678 tree.type = syms.errType;
679 return chk.completionError(tree.pos(), ex);
680 } finally {
681 this.env = prevEnv;
682 this.resultInfo = prevResult;
683 }
684 }
685
686 protected void breakTreeFound(Env<AttrContext> env) {
687 throw new BreakAttr(env);
688 }
689
690 Env<AttrContext> copyEnv(Env<AttrContext> env) {
691 Env<AttrContext> newEnv =
692 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
693 if (newEnv.outer != null) {
694 newEnv.outer = copyEnv(newEnv.outer);
695 }
696 return newEnv;
697 }
698
699 WriteableScope copyScope(WriteableScope sc) {
700 WriteableScope newScope = WriteableScope.create(sc.owner);
701 List<Symbol> elemsList = List.nil();
702 for (Symbol sym : sc.getSymbols()) {
703 elemsList = elemsList.prepend(sym);
704 }
705 for (Symbol s : elemsList) {
706 newScope.enter(s);
707 }
708 return newScope;
709 }
710
711 /** Derived visitor method: attribute an expression tree.
712 */
713 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
714 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
715 }
716
717 /** Derived visitor method: attribute an expression tree with
718 * no constraints on the computed type.
719 */
720 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
721 return attribTree(tree, env, unknownExprInfo);
722 }
723
724 /** Derived visitor method: attribute a type tree.
725 */
726 public Type attribType(JCTree tree, Env<AttrContext> env) {
727 Type result = attribType(tree, env, Type.noType);
728 return result;
729 }
730
731 /** Derived visitor method: attribute a type tree.
732 */
733 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
734 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
735 return result;
736 }
737
738 /** Derived visitor method: attribute a statement or definition tree.
739 */
740 public Type attribStat(JCTree tree, Env<AttrContext> env) {
741 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
742 Type result = attribTree(tree, env, statInfo);
743 analyzer.analyzeIfNeeded(tree, analyzeEnv);
744 attrRecover.doRecovery();
745 return result;
746 }
747
748 /** Attribute a list of expressions, returning a list of types.
749 */
750 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
751 ListBuffer<Type> ts = new ListBuffer<>();
752 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
753 ts.append(attribExpr(l.head, env, pt));
754 return ts.toList();
755 }
756
757 /** Attribute a list of statements, returning nothing.
758 */
759 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
760 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
761 attribStat(l.head, env);
762 }
763
764 /** Attribute the arguments in a method call, returning the method kind.
765 */
766 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
767 KindSelector kind = initialKind;
768 for (JCExpression arg : trees) {
769 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
770 if (argtype.hasTag(DEFERRED)) {
771 kind = KindSelector.of(KindSelector.POLY, kind);
772 }
773 argtypes.append(argtype);
774 }
775 return kind;
776 }
777
778 /** Attribute a type argument list, returning a list of types.
779 * Caller is responsible for calling checkRefTypes.
780 */
781 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
782 ListBuffer<Type> argtypes = new ListBuffer<>();
783 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
784 argtypes.append(attribType(l.head, env));
785 return argtypes.toList();
786 }
787
788 /** Attribute a type argument list, returning a list of types.
789 * Check that all the types are references.
790 */
791 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
792 List<Type> types = attribAnyTypes(trees, env);
793 return chk.checkRefTypes(trees, types);
794 }
795
796 /**
797 * Attribute type variables (of generic classes or methods).
798 * Compound types are attributed later in attribBounds.
799 * @param typarams the type variables to enter
800 * @param env the current environment
801 */
802 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
803 for (JCTypeParameter tvar : typarams) {
804 TypeVar a = (TypeVar)tvar.type;
805 a.tsym.flags_field |= UNATTRIBUTED;
806 a.setUpperBound(Type.noType);
807 if (!tvar.bounds.isEmpty()) {
808 List<Type> bounds = List.of(chk.checkRefType(tvar.bounds.head, attribType(tvar.bounds.head, env), false));
809 for (JCExpression bound : tvar.bounds.tail)
810 bounds = bounds.prepend(chk.checkRefType(bound, attribType(bound, env), false));
811 types.setBounds(a, bounds.reverse());
812 } else {
813 // if no bounds are given, assume a single bound of
814 // java.lang.Object.
815 types.setBounds(a, List.of(syms.objectType));
816 }
817 a.tsym.flags_field &= ~UNATTRIBUTED;
818 }
819 if (checkCyclic) {
820 for (JCTypeParameter tvar : typarams) {
821 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
822 }
823 }
824 }
825
826 /**
827 * Attribute the type references in a list of annotations.
828 */
829 void attribAnnotationTypes(List<JCAnnotation> annotations,
830 Env<AttrContext> env) {
831 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
832 JCAnnotation a = al.head;
833 attribType(a.annotationType, env);
834 }
835 }
836
837 /**
838 * Attribute a "lazy constant value".
839 * @param env The env for the const value
840 * @param variable The initializer for the const value
841 * @param type The expected type, or null
842 * @see VarSymbol#setLazyConstValue
843 */
844 public Object attribLazyConstantValue(Env<AttrContext> env,
845 JCVariableDecl variable,
846 Type type) {
847
848 DiagnosticPosition prevLintPos
849 = deferredLintHandler.setPos(variable.pos());
850
851 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
852 try {
853 Type itype = attribExpr(variable.init, env, type);
854 if (variable.isImplicitlyTyped()) {
855 //fixup local variable type
856 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
857 }
858 if (itype.constValue() != null) {
859 return coerce(itype, type).constValue();
860 } else {
861 return null;
862 }
863 } finally {
864 log.useSource(prevSource);
865 deferredLintHandler.setPos(prevLintPos);
866 }
867 }
868
869 /** Attribute type reference in an `extends' or `implements' clause.
870 * Supertypes of anonymous inner classes are usually already attributed.
871 *
872 * @param tree The tree making up the type reference.
873 * @param env The environment current at the reference.
874 * @param classExpected true if only a class is expected here.
875 * @param interfaceExpected true if only an interface is expected here.
876 */
877 Type attribBase(JCTree tree,
878 Env<AttrContext> env,
879 boolean classExpected,
880 boolean interfaceExpected,
881 boolean checkExtensible) {
882 Type t = tree.type != null ?
883 tree.type :
884 attribType(tree, env);
885 try {
886 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
887 } catch (CompletionFailure ex) {
888 chk.completionError(tree.pos(), ex);
889 return t;
890 }
891 }
892 Type checkBase(Type t,
893 JCTree tree,
894 Env<AttrContext> env,
895 boolean classExpected,
896 boolean interfaceExpected,
897 boolean checkExtensible) {
898 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
899 (((JCTypeApply) tree).clazz).pos() : tree.pos();
900 if (t.tsym.isAnonymous()) {
901 log.error(pos, Errors.CantInheritFromAnon);
902 return types.createErrorType(t);
903 }
904 if (t.isErroneous())
905 return t;
906 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
907 // check that type variable is already visible
908 if (t.getUpperBound() == null) {
909 log.error(pos, Errors.IllegalForwardRef);
910 return types.createErrorType(t);
911 }
912 } else {
913 t = chk.checkClassType(pos, t, checkExtensible);
914 }
915 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
916 log.error(pos, Errors.IntfExpectedHere);
917 // return errType is necessary since otherwise there might
918 // be undetected cycles which cause attribution to loop
919 return types.createErrorType(t);
920 } else if (checkExtensible &&
921 classExpected &&
922 (t.tsym.flags() & INTERFACE) != 0) {
923 log.error(pos, Errors.NoIntfExpectedHere);
924 return types.createErrorType(t);
925 }
926 if (checkExtensible &&
927 ((t.tsym.flags() & FINAL) != 0)) {
928 log.error(pos,
929 Errors.CantInheritFromFinal(t.tsym));
930 }
931 chk.checkNonCyclic(pos, t);
932 return t;
933 }
934
935 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
936 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
937 id.type = env.info.scope.owner.enclClass().type;
938 id.sym = env.info.scope.owner.enclClass();
939 return id.type;
940 }
941
942 public void visitClassDef(JCClassDecl tree) {
943 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
944 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
945 argumentAttr.withLocalCacheContext() : null);
946 try {
947 // Local and anonymous classes have not been entered yet, so we need to
948 // do it now.
949 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
950 enter.classEnter(tree, env);
951 } else {
952 // If this class declaration is part of a class level annotation,
953 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
954 // order to simplify later steps and allow for sensible error
955 // messages.
956 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
957 enter.classEnter(tree, env);
958 }
959
960 ClassSymbol c = tree.sym;
961 if (c == null) {
962 // exit in case something drastic went wrong during enter.
963 result = null;
964 } else {
965 // make sure class has been completed:
966 c.complete();
967
968 // If this class appears as an anonymous class
969 // in a superclass constructor call
970 // disable implicit outer instance from being passed.
971 // (This would be an illegal access to "this before super").
972 if (env.info.isSelfCall &&
973 env.tree.hasTag(NEWCLASS)) {
974 c.flags_field |= NOOUTERTHIS;
975 }
976 attribClass(tree.pos(), c);
977 result = tree.type = c.type;
978 }
979 } finally {
980 localCacheContext.ifPresent(LocalCacheContext::leave);
981 }
982 }
983
984 public void visitMethodDef(JCMethodDecl tree) {
985 MethodSymbol m = tree.sym;
986 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
987
988 Lint lint = env.info.lint.augment(m);
989 Lint prevLint = chk.setLint(lint);
990 MethodSymbol prevMethod = chk.setMethod(m);
991 try {
992 deferredLintHandler.flush(tree.pos());
993 chk.checkDeprecatedAnnotation(tree.pos(), m);
994
995
996 // Create a new environment with local scope
997 // for attributing the method.
998 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
999 localEnv.info.lint = lint;
1000
1001 attribStats(tree.typarams, localEnv);
1002
1003 // If we override any other methods, check that we do so properly.
1004 // JLS ???
1005 if (m.isStatic()) {
1006 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1007 } else {
1008 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1009 }
1010 chk.checkOverride(env, tree, m);
1011
1012 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1013 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1014 }
1015
1016 // Enter all type parameters into the local method scope.
1017 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1018 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1019
1020 ClassSymbol owner = env.enclClass.sym;
1021 if ((owner.flags() & ANNOTATION) != 0 &&
1022 (tree.params.nonEmpty() ||
1023 tree.recvparam != null))
1024 log.error(tree.params.nonEmpty() ?
1025 tree.params.head.pos() :
1026 tree.recvparam.pos(),
1027 Errors.IntfAnnotationMembersCantHaveParams);
1028
1029 // Attribute all value parameters.
1030 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1031 attribStat(l.head, localEnv);
1032 }
1033
1034 chk.checkVarargsMethodDecl(localEnv, tree);
1035
1036 // Check that type parameters are well-formed.
1037 chk.validate(tree.typarams, localEnv);
1038
1039 // Check that result type is well-formed.
1040 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1041 chk.validate(tree.restype, localEnv);
1042
1043 // Check that receiver type is well-formed.
1044 if (tree.recvparam != null) {
1045 // Use a new environment to check the receiver parameter.
1046 // Otherwise I get "might not have been initialized" errors.
1047 // Is there a better way?
1048 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1049 attribType(tree.recvparam, newEnv);
1050 chk.validate(tree.recvparam, newEnv);
1051 }
1052
1053 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1054 // lets find if this method is an accessor
1055 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1056 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1057 if (recordComponent.isPresent()) {
1058 // the method is a user defined accessor lets check that everything is fine
1059 if (!tree.sym.isPublic()) {
1060 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1061 }
1062 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1063 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1064 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1065 }
1066 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1067 log.error(tree,
1068 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1069 }
1070 if (!tree.typarams.isEmpty()) {
1071 log.error(tree,
1072 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1073 }
1074 if (tree.sym.isStatic()) {
1075 log.error(tree,
1076 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1077 }
1078 }
1079
1080 if (names.isInitOrVNew(tree.name)) {
1081 // if this a constructor other than the canonical one
1082 if ((tree.sym.flags_field & RECORD) == 0) {
1083 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1084 if (app == null ||
1085 TreeInfo.name(app.meth) != names._this ||
1086 !checkFirstConstructorStat(app, tree, false)) {
1087 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1088 }
1089 } else {
1090 // but if it is the canonical:
1091
1092 /* if user generated, then it shouldn't:
1093 * - have an accessibility stricter than that of the record type
1094 * - explicitly invoke any other constructor
1095 */
1096 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1097 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1098 log.error(tree,
1099 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1100 Errors.InvalidCanonicalConstructorInRecord(
1101 Fragments.Canonical,
1102 env.enclClass.sym.name,
1103 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1104 ) :
1105 Errors.InvalidCanonicalConstructorInRecord(
1106 Fragments.Canonical,
1107 env.enclClass.sym.name,
1108 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1109 )
1110 );
1111 }
1112
1113 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1114 if (app != null &&
1115 (TreeInfo.name(app.meth) == names._this ||
1116 TreeInfo.name(app.meth) == names._super) &&
1117 checkFirstConstructorStat(app, tree, false)) {
1118 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1119 Fragments.Canonical, env.enclClass.sym.name,
1120 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1121 }
1122 }
1123
1124 // also we want to check that no type variables have been defined
1125 if (!tree.typarams.isEmpty()) {
1126 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1127 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1128 }
1129
1130 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1131 * record components
1132 */
1133 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1134 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1135 for (JCVariableDecl param: tree.params) {
1136 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1137 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1138 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1139 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1140 Fragments.Canonical, env.enclClass.sym.name,
1141 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1142 }
1143 recordComponents = recordComponents.tail;
1144 recordFieldTypes = recordFieldTypes.tail;
1145 }
1146 }
1147 }
1148 }
1149
1150 // annotation method checks
1151 if ((owner.flags() & ANNOTATION) != 0) {
1152 // annotation method cannot have throws clause
1153 if (tree.thrown.nonEmpty()) {
1154 log.error(tree.thrown.head.pos(),
1155 Errors.ThrowsNotAllowedInIntfAnnotation);
1156 }
1157 // annotation method cannot declare type-parameters
1158 if (tree.typarams.nonEmpty()) {
1159 log.error(tree.typarams.head.pos(),
1160 Errors.IntfAnnotationMembersCantHaveTypeParams);
1161 }
1162 // validate annotation method's return type (could be an annotation type)
1163 chk.validateAnnotationType(tree.restype);
1164 // ensure that annotation method does not clash with members of Object/Annotation
1165 chk.validateAnnotationMethod(tree.pos(), m);
1166 }
1167
1168 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1169 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1170
1171 if (tree.body == null) {
1172 // Empty bodies are only allowed for
1173 // abstract, native, or interface methods, or for methods
1174 // in a retrofit signature class.
1175 if (tree.defaultValue != null) {
1176 if ((owner.flags() & ANNOTATION) == 0)
1177 log.error(tree.pos(),
1178 Errors.DefaultAllowedInIntfAnnotationMember);
1179 }
1180 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1181 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1182 } else {
1183 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1184 if ((owner.flags() & INTERFACE) != 0) {
1185 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1186 } else {
1187 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1188 }
1189 } else if ((tree.mods.flags & NATIVE) != 0) {
1190 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1191 }
1192 // Add an implicit super() call unless an explicit call to
1193 // super(...) or this(...) is given
1194 // or we are compiling class java.lang.Object.
1195 if (names.isInitOrVNew(tree.name) && owner.type != syms.objectType) {
1196 JCBlock body = tree.body;
1197 if (body.stats.isEmpty() ||
1198 TreeInfo.getConstructorInvocationName(body.stats, names, true) == names.empty) {
1199 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1200 make.Ident(names._super), make.Idents(List.nil())));
1201 body.stats = body.stats.prepend(supCall);
1202 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1203 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1204 TreeInfo.isSuperCall(body.stats.head)) {
1205 // enum constructors are not allowed to call super
1206 // directly, so make sure there aren't any super calls
1207 // in enum constructors, except in the compiler
1208 // generated one.
1209 log.error(tree.body.stats.head.pos(),
1210 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1211 } else if ((env.enclClass.sym.flags() & VALUE_CLASS) != 0 &&
1212 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1213 TreeInfo.isSuperCall(body.stats.head)) {
1214 // value constructors are not allowed to call super directly,
1215 // but tolerate compiler generated ones, these are ignored during code generation
1216 log.error(tree.body.stats.head.pos(), Errors.CallToSuperNotAllowedInValueCtor);
1217 }
1218 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1219 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1220 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1221 if (!initParamNames.equals(recordComponentNames)) {
1222 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1223 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1224 }
1225 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1226 log.error(tree,
1227 Errors.InvalidCanonicalConstructorInRecord(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1229 env.enclClass.sym.name,
1230 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1231 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1232 }
1233 }
1234 }
1235
1236 // Attribute all type annotations in the body
1237 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1238 annotate.flush();
1239
1240 // Attribute method body.
1241 attribStat(tree.body, localEnv);
1242 }
1243
1244 localEnv.info.scope.leave();
1245 result = tree.type = m.type;
1246 } finally {
1247 chk.setLint(prevLint);
1248 chk.setMethod(prevMethod);
1249 }
1250 }
1251
1252 public void visitVarDef(JCVariableDecl tree) {
1253 // Local variables have not been entered yet, so we need to do it now:
1254 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1255 if (tree.sym != null) {
1256 // parameters have already been entered
1257 env.info.scope.enter(tree.sym);
1258 } else {
1259 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1260 if (tree.init == null) {
1261 //cannot use 'var' without initializer
1262 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1263 tree.vartype = make.Erroneous();
1264 } else {
1265 Fragment msg = canInferLocalVarType(tree);
1266 if (msg != null) {
1267 //cannot use 'var' with initializer which require an explicit target
1268 //(e.g. lambda, method reference, array initializer).
1269 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1270 tree.vartype = make.Erroneous();
1271 }
1272 }
1273 }
1274 try {
1275 annotate.blockAnnotations();
1276 memberEnter.memberEnter(tree, env);
1277 } finally {
1278 annotate.unblockAnnotations();
1279 }
1280 }
1281 } else {
1282 if (tree.init != null) {
1283 // Field initializer expression need to be entered.
1284 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1285 annotate.flush();
1286 }
1287 }
1288
1289 VarSymbol v = tree.sym;
1290 Lint lint = env.info.lint.augment(v);
1291 Lint prevLint = chk.setLint(lint);
1292
1293 // Check that the variable's declared type is well-formed.
1294 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1295 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1296 (tree.sym.flags() & PARAMETER) != 0;
1297 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1298
1299 try {
1300 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1301 deferredLintHandler.flush(tree.pos());
1302 chk.checkDeprecatedAnnotation(tree.pos(), v);
1303
1304 /* Don't want constant propagation/folding for instance fields of primitive classes,
1305 as these can undergo updates via copy on write.
1306 */
1307 if (tree.init != null) {
1308 if ((v.flags_field & FINAL) == 0 || ((v.flags_field & STATIC) == 0 && v.owner.isValueClass()) ||
1309 !memberEnter.needsLazyConstValue(tree.init)) {
1310 // Not a compile-time constant
1311 // Attribute initializer in a new environment
1312 // with the declared variable as owner.
1313 // Check that initializer conforms to variable's declared type.
1314 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1315 initEnv.info.lint = lint;
1316 // In order to catch self-references, we set the variable's
1317 // declaration position to maximal possible value, effectively
1318 // marking the variable as undefined.
1319 initEnv.info.enclVar = v;
1320 attribExpr(tree.init, initEnv, v.type);
1321 if (tree.isImplicitlyTyped()) {
1322 //fixup local variable type
1323 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1324 }
1325 }
1326 if (tree.isImplicitlyTyped()) {
1327 setSyntheticVariableType(tree, v.type);
1328 }
1329 }
1330 result = tree.type = v.type;
1331 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1332 if (isNonArgsMethodInObject(v.name)) {
1333 log.error(tree, Errors.IllegalRecordComponentName(v));
1334 }
1335 }
1336 }
1337 finally {
1338 chk.setLint(prevLint);
1339 }
1340 }
1341
1342 private boolean isNonArgsMethodInObject(Name name) {
1343 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1344 if (s.type.getParameterTypes().isEmpty()) {
1345 return true;
1346 }
1347 }
1348 // isValueObject is not included in Object yet so we need a work around
1349 return name == names.isValueObject;
1350 }
1351
1352 Fragment canInferLocalVarType(JCVariableDecl tree) {
1353 LocalInitScanner lis = new LocalInitScanner();
1354 lis.scan(tree.init);
1355 return lis.badInferenceMsg;
1356 }
1357
1358 static class LocalInitScanner extends TreeScanner {
1359 Fragment badInferenceMsg = null;
1360 boolean needsTarget = true;
1361
1362 @Override
1363 public void visitNewArray(JCNewArray tree) {
1364 if (tree.elemtype == null && needsTarget) {
1365 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1366 }
1367 }
1368
1369 @Override
1370 public void visitLambda(JCLambda tree) {
1371 if (needsTarget) {
1372 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1373 }
1374 }
1375
1376 @Override
1377 public void visitTypeCast(JCTypeCast tree) {
1378 boolean prevNeedsTarget = needsTarget;
1379 try {
1380 needsTarget = false;
1381 super.visitTypeCast(tree);
1382 } finally {
1383 needsTarget = prevNeedsTarget;
1384 }
1385 }
1386
1387 @Override
1388 public void visitReference(JCMemberReference tree) {
1389 if (needsTarget) {
1390 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1391 }
1392 }
1393
1394 @Override
1395 public void visitNewClass(JCNewClass tree) {
1396 boolean prevNeedsTarget = needsTarget;
1397 try {
1398 needsTarget = false;
1399 super.visitNewClass(tree);
1400 } finally {
1401 needsTarget = prevNeedsTarget;
1402 }
1403 }
1404
1405 @Override
1406 public void visitApply(JCMethodInvocation tree) {
1407 boolean prevNeedsTarget = needsTarget;
1408 try {
1409 needsTarget = false;
1410 super.visitApply(tree);
1411 } finally {
1412 needsTarget = prevNeedsTarget;
1413 }
1414 }
1415 }
1416
1417 public void visitSkip(JCSkip tree) {
1418 result = null;
1419 }
1420
1421 public void visitBlock(JCBlock tree) {
1422 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1423 // Block is a static or instance initializer;
1424 // let the owner of the environment be a freshly
1425 // created BLOCK-method.
1426 Symbol fakeOwner =
1427 new MethodSymbol(tree.flags | BLOCK |
1428 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1429 env.info.scope.owner);
1430 final Env<AttrContext> localEnv =
1431 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1432
1433 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1434 // Attribute all type annotations in the block
1435 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1436 annotate.flush();
1437 attribStats(tree.stats, localEnv);
1438
1439 {
1440 // Store init and clinit type annotations with the ClassSymbol
1441 // to allow output in Gen.normalizeDefs.
1442 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1443 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1444 if ((tree.flags & STATIC) != 0) {
1445 cs.appendClassInitTypeAttributes(tas);
1446 } else {
1447 cs.appendInitTypeAttributes(tas);
1448 }
1449 }
1450 } else {
1451 // Create a new local environment with a local scope.
1452 Env<AttrContext> localEnv =
1453 env.dup(tree, env.info.dup(env.info.scope.dup()));
1454 try {
1455 attribStats(tree.stats, localEnv);
1456 } finally {
1457 localEnv.info.scope.leave();
1458 }
1459 }
1460 result = null;
1461 }
1462
1463 public void visitDoLoop(JCDoWhileLoop tree) {
1464 attribStat(tree.body, env.dup(tree));
1465 attribExpr(tree.cond, env, syms.booleanType);
1466 handleLoopConditionBindings(matchBindings, tree, tree.body);
1467 result = null;
1468 }
1469
1470 public void visitWhileLoop(JCWhileLoop tree) {
1471 attribExpr(tree.cond, env, syms.booleanType);
1472 MatchBindings condBindings = matchBindings;
1473 // include condition's bindings when true in the body:
1474 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1475 try {
1476 attribStat(tree.body, whileEnv.dup(tree));
1477 } finally {
1478 whileEnv.info.scope.leave();
1479 }
1480 handleLoopConditionBindings(condBindings, tree, tree.body);
1481 result = null;
1482 }
1483
1484 public void visitForLoop(JCForLoop tree) {
1485 Env<AttrContext> loopEnv =
1486 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1487 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1488 try {
1489 attribStats(tree.init, loopEnv);
1490 if (tree.cond != null) {
1491 attribExpr(tree.cond, loopEnv, syms.booleanType);
1492 // include condition's bindings when true in the body and step:
1493 condBindings = matchBindings;
1494 }
1495 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1496 try {
1497 bodyEnv.tree = tree; // before, we were not in loop!
1498 attribStats(tree.step, bodyEnv);
1499 attribStat(tree.body, bodyEnv);
1500 } finally {
1501 bodyEnv.info.scope.leave();
1502 }
1503 result = null;
1504 }
1505 finally {
1506 loopEnv.info.scope.leave();
1507 }
1508 handleLoopConditionBindings(condBindings, tree, tree.body);
1509 }
1510
1511 /**
1512 * Include condition's bindings when false after the loop, if cannot get out of the loop
1513 */
1514 private void handleLoopConditionBindings(MatchBindings condBindings,
1515 JCStatement loop,
1516 JCStatement loopBody) {
1517 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1518 !breaksTo(env, loop, loopBody)) {
1519 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1520 }
1521 }
1522
1523 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1524 preFlow(body);
1525 return flow.breaksToTree(env, loop, body, make);
1526 }
1527
1528 /**
1529 * Add given bindings to the current scope, unless there's a break to
1530 * an immediately enclosing labeled statement.
1531 */
1532 private void addBindings2Scope(JCStatement introducingStatement,
1533 List<BindingSymbol> bindings) {
1534 if (bindings.isEmpty()) {
1535 return ;
1536 }
1537
1538 var searchEnv = env;
1539 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1540 labeled.body == introducingStatement) {
1541 if (breaksTo(env, labeled, labeled.body)) {
1542 //breaking to an immediately enclosing labeled statement
1543 return ;
1544 }
1545 searchEnv = searchEnv.next;
1546 introducingStatement = labeled;
1547 }
1548
1549 //include condition's body when false after the while, if cannot get out of the loop
1550 bindings.forEach(env.info.scope::enter);
1551 bindings.forEach(BindingSymbol::preserveBinding);
1552 }
1553
1554 public void visitForeachLoop(JCEnhancedForLoop tree) {
1555 Env<AttrContext> loopEnv =
1556 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1557 try {
1558 //the Formal Parameter of a for-each loop is not in the scope when
1559 //attributing the for-each expression; we mimic this by attributing
1560 //the for-each expression first (against original scope).
1561 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1562 chk.checkNonVoid(tree.pos(), exprType);
1563 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1564 if (elemtype == null) {
1565 // or perhaps expr implements Iterable<T>?
1566 Type base = types.asSuper(exprType.referenceProjectionOrSelf(), syms.iterableType.tsym);
1567 if (base == null) {
1568 log.error(tree.expr.pos(),
1569 Errors.ForeachNotApplicableToType(exprType,
1570 Fragments.TypeReqArrayOrIterable));
1571 elemtype = types.createErrorType(exprType);
1572 } else {
1573 List<Type> iterableParams = base.allparams();
1574 elemtype = iterableParams.isEmpty()
1575 ? syms.objectType
1576 : types.wildUpperBound(iterableParams.head);
1577
1578 // Check the return type of the method iterator().
1579 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1580 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1581 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1582 if (types.asSuper(iterSymbol.type.getReturnType().referenceProjectionOrSelf(), syms.iteratorType.tsym) == null) {
1583 log.error(tree.pos(),
1584 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1585 }
1586 }
1587 }
1588 if (tree.var.isImplicitlyTyped()) {
1589 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1590 setSyntheticVariableType(tree.var, inferredType);
1591 }
1592 attribStat(tree.var, loopEnv);
1593 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1594 loopEnv.tree = tree; // before, we were not in loop!
1595 attribStat(tree.body, loopEnv);
1596 result = null;
1597 }
1598 finally {
1599 loopEnv.info.scope.leave();
1600 }
1601 }
1602
1603 public void visitLabelled(JCLabeledStatement tree) {
1604 // Check that label is not used in an enclosing statement
1605 Env<AttrContext> env1 = env;
1606 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1607 if (env1.tree.hasTag(LABELLED) &&
1608 ((JCLabeledStatement) env1.tree).label == tree.label) {
1609 log.error(tree.pos(),
1610 Errors.LabelAlreadyInUse(tree.label));
1611 break;
1612 }
1613 env1 = env1.next;
1614 }
1615
1616 attribStat(tree.body, env.dup(tree));
1617 result = null;
1618 }
1619
1620 public void visitSwitch(JCSwitch tree) {
1621 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1622 attribStats(c.stats, caseEnv);
1623 });
1624 result = null;
1625 }
1626
1627 public void visitSwitchExpression(JCSwitchExpression tree) {
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 result = tree.type = types.createErrorType(resultInfo.pt);
1635 return;
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 = 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 errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1701 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1702 boolean errorPrimitiveSwitch = seltype.isPrimitive() && !intSwitch;
1703 boolean patternSwitch;
1704 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1705 !intSwitch && !errorPrimitiveSwitch) {
1706 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1707 patternSwitch = true;
1708 } else {
1709 if (errorPrimitiveSwitch) {
1710 log.error(selector.pos(), Errors.SelectorTypeNotAllowed(seltype));
1711 }
1712 patternSwitch = cases.stream()
1713 .flatMap(c -> c.labels.stream())
1714 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1715 TreeInfo.isNullCaseLabel(l));
1716 }
1717
1718 // Attribute all cases and
1719 // check that there are no duplicate case labels or default clauses.
1720 Set<Object> constants = new HashSet<>(); // The set of case constants.
1721 boolean hasDefault = false; // Is there a default label?
1722 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1723 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1724 boolean hasNullPattern = false; // Is there a null pattern?
1725 CaseTree.CaseKind caseKind = null;
1726 boolean wasError = false;
1727 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1728 JCCase c = l.head;
1729 if (caseKind == null) {
1730 caseKind = c.caseKind;
1731 } else if (caseKind != c.caseKind && !wasError) {
1732 log.error(c.pos(),
1733 Errors.SwitchMixingCaseTypes);
1734 wasError = true;
1735 }
1736 MatchBindings currentBindings = null;
1737 MatchBindings guardBindings = null;
1738 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1739 JCCaseLabel label = labels.head;
1740 if (label instanceof JCConstantCaseLabel constLabel) {
1741 JCExpression expr = constLabel.expr;
1742 if (TreeInfo.isNull(expr)) {
1743 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1744 if (hasNullPattern) {
1745 log.error(label.pos(), Errors.DuplicateCaseLabel);
1746 }
1747 hasNullPattern = true;
1748 attribExpr(expr, switchEnv, seltype);
1749 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1750 } else if (enumSwitch) {
1751 Symbol sym = enumConstant(expr, seltype);
1752 if (sym == null) {
1753 if (allowPatternSwitch) {
1754 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1755 Symbol enumSym = TreeInfo.symbol(expr);
1756 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1757 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1758 } else if (!constants.add(enumSym)) {
1759 log.error(label.pos(), Errors.DuplicateCaseLabel);
1760 }
1761 } else {
1762 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1763 }
1764 } else if (!constants.add(sym)) {
1765 log.error(label.pos(), Errors.DuplicateCaseLabel);
1766 }
1767 } else if (errorEnumSwitch) {
1768 //error recovery: the selector is erroneous, and all the case labels
1769 //are identifiers. This could be an enum switch - don't report resolve
1770 //error for the case label:
1771 var prevResolveHelper = rs.basicLogResolveHelper;
1772 try {
1773 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1774 attribExpr(expr, switchEnv, seltype);
1775 } finally {
1776 rs.basicLogResolveHelper = prevResolveHelper;
1777 }
1778 } else {
1779 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1780 if (!pattype.hasTag(ERROR)) {
1781 if (pattype.constValue() == null) {
1782 Symbol s = TreeInfo.symbol(expr);
1783 if (s != null && s.kind == TYP) {
1784 log.error(expr.pos(),
1785 Errors.PatternExpected);
1786 } else if (s == null || !s.isEnum()) {
1787 log.error(expr.pos(),
1788 (stringSwitch ? Errors.StringConstReq
1789 : intSwitch ? Errors.ConstExprReq
1790 : Errors.PatternOrEnumReq));
1791 } else if (!constants.add(s)) {
1792 log.error(label.pos(), Errors.DuplicateCaseLabel);
1793 }
1794 } else if (!stringSwitch && !intSwitch && !errorPrimitiveSwitch) {
1795 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1796 } else if (!constants.add(pattype.constValue())) {
1797 log.error(c.pos(), Errors.DuplicateCaseLabel);
1798 }
1799 }
1800 }
1801 } else if (label instanceof JCDefaultCaseLabel def) {
1802 if (hasDefault) {
1803 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1804 } else if (hasUnconditionalPattern) {
1805 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1806 }
1807 hasDefault = true;
1808 matchBindings = MatchBindingsComputer.EMPTY;
1809 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1810 //pattern
1811 JCPattern pat = patternlabel.pat;
1812 attribExpr(pat, switchEnv, seltype);
1813 Type primaryType = TreeInfo.primaryPatternType(pat);
1814 if (!primaryType.hasTag(TYPEVAR)) {
1815 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1816 }
1817 if (!errorPrimitiveSwitch) {
1818 checkCastablePattern(pat.pos(), seltype, primaryType);
1819 }
1820 Type patternType = types.erasure(primaryType);
1821 JCExpression guard = c.guard;
1822 if (guardBindings == null && guard != null) {
1823 MatchBindings afterPattern = matchBindings;
1824 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1825 try {
1826 attribExpr(guard, bodyEnv, syms.booleanType);
1827 } finally {
1828 bodyEnv.info.scope.leave();
1829 }
1830
1831 guardBindings = matchBindings;
1832 matchBindings = afterPattern;
1833
1834 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1835 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1836 }
1837 }
1838 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1839 boolean unconditional =
1840 unguarded &&
1841 !patternType.isErroneous() &&
1842 types.isSubtype(types.boxedTypeOrType(types.erasure(seltype)),
1843 patternType);
1844 if (unconditional) {
1845 if (hasUnconditionalPattern) {
1846 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1847 } else if (hasDefault) {
1848 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1849 }
1850 hasUnconditionalPattern = true;
1851 }
1852 lastPatternErroneous = patternType.isErroneous();
1853 } else {
1854 Assert.error();
1855 }
1856 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1857 }
1858
1859 if (guardBindings != null) {
1860 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1861 }
1862
1863 Env<AttrContext> caseEnv =
1864 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1865 try {
1866 attribCase.accept(c, caseEnv);
1867 } finally {
1868 caseEnv.info.scope.leave();
1869 }
1870 addVars(c.stats, switchEnv.info.scope);
1871
1872 preFlow(c);
1873 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1874 }
1875 if (patternSwitch) {
1876 chk.checkSwitchCaseStructure(cases);
1877 chk.checkSwitchCaseLabelDominated(cases);
1878 }
1879 if (switchTree.hasTag(SWITCH)) {
1880 ((JCSwitch) switchTree).hasUnconditionalPattern =
1881 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1882 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1883 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1884 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1885 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1886 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1887 } else {
1888 Assert.error(switchTree.getTag().name());
1889 }
1890 } finally {
1891 switchEnv.info.scope.leave();
1892 }
1893 }
1894 // where
1895 private ResultInfo caseLabelResultInfo(Type seltype) {
1896 return new ResultInfo(KindSelector.VAL_TYP,
1897 !seltype.hasTag(ERROR) ? seltype
1898 : Type.noType);
1899 }
1900 /** Add any variables defined in stats to the switch scope. */
1901 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1902 for (;stats.nonEmpty(); stats = stats.tail) {
1903 JCTree stat = stats.head;
1904 if (stat.hasTag(VARDEF))
1905 switchScope.enter(((JCVariableDecl) stat).sym);
1906 }
1907 }
1908 // where
1909 /** Return the selected enumeration constant symbol, or null. */
1910 private Symbol enumConstant(JCTree tree, Type enumType) {
1911 if (tree.hasTag(IDENT)) {
1912 JCIdent ident = (JCIdent)tree;
1913 Name name = ident.name;
1914 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1915 if (sym.kind == VAR) {
1916 Symbol s = ident.sym = sym;
1917 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1918 ident.type = s.type;
1919 return ((s.flags_field & Flags.ENUM) == 0)
1920 ? null : s;
1921 }
1922 }
1923 }
1924 return null;
1925 }
1926
1927 public void visitSynchronized(JCSynchronized tree) {
1928 chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1929 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1930 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1931 }
1932 attribStat(tree.body, env);
1933 result = null;
1934 }
1935 // where
1936 private boolean isValueBased(Type t) {
1937 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1938 }
1939
1940
1941 public void visitTry(JCTry tree) {
1942 // Create a new local environment with a local
1943 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1944 try {
1945 boolean isTryWithResource = tree.resources.nonEmpty();
1946 // Create a nested environment for attributing the try block if needed
1947 Env<AttrContext> tryEnv = isTryWithResource ?
1948 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1949 localEnv;
1950 try {
1951 // Attribute resource declarations
1952 for (JCTree resource : tree.resources) {
1953 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1954 @Override
1955 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1956 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1957 }
1958 };
1959 ResultInfo twrResult =
1960 new ResultInfo(KindSelector.VAR,
1961 syms.autoCloseableType,
1962 twrContext);
1963 if (resource.hasTag(VARDEF)) {
1964 attribStat(resource, tryEnv);
1965 twrResult.check(resource, resource.type);
1966
1967 //check that resource type cannot throw InterruptedException
1968 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1969
1970 VarSymbol var = ((JCVariableDecl) resource).sym;
1971
1972 var.flags_field |= Flags.FINAL;
1973 var.setData(ElementKind.RESOURCE_VARIABLE);
1974 } else {
1975 attribTree(resource, tryEnv, twrResult);
1976 }
1977 }
1978 // Attribute body
1979 attribStat(tree.body, tryEnv);
1980 } finally {
1981 if (isTryWithResource)
1982 tryEnv.info.scope.leave();
1983 }
1984
1985 // Attribute catch clauses
1986 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1987 JCCatch c = l.head;
1988 Env<AttrContext> catchEnv =
1989 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1990 try {
1991 Type ctype = attribStat(c.param, catchEnv);
1992 if (TreeInfo.isMultiCatch(c)) {
1993 //multi-catch parameter is implicitly marked as final
1994 c.param.sym.flags_field |= FINAL | UNION;
1995 }
1996 if (c.param.sym.kind == VAR) {
1997 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1998 }
1999 chk.checkType(c.param.vartype.pos(),
2000 chk.checkClassType(c.param.vartype.pos(), ctype),
2001 syms.throwableType);
2002 attribStat(c.body, catchEnv);
2003 } finally {
2004 catchEnv.info.scope.leave();
2005 }
2006 }
2007
2008 // Attribute finalizer
2009 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2010 result = null;
2011 }
2012 finally {
2013 localEnv.info.scope.leave();
2014 }
2015 }
2016
2017 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2018 if (!resource.isErroneous() &&
2019 types.asSuper(resource.referenceProjectionOrSelf(), syms.autoCloseableType.tsym) != null &&
2020 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2021 Symbol close = syms.noSymbol;
2022 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2023 try {
2024 close = rs.resolveQualifiedMethod(pos,
2025 env,
2026 types.skipTypeVars(resource, false),
2027 names.close,
2028 List.nil(),
2029 List.nil());
2030 }
2031 finally {
2032 log.popDiagnosticHandler(discardHandler);
2033 }
2034 if (close.kind == MTH &&
2035 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2036 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2037 env.info.lint.isEnabled(LintCategory.TRY)) {
2038 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2039 }
2040 }
2041 }
2042
2043 public void visitConditional(JCConditional tree) {
2044 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2045 MatchBindings condBindings = matchBindings;
2046
2047 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2048 isBooleanOrNumeric(env, tree)) ?
2049 PolyKind.STANDALONE : PolyKind.POLY;
2050
2051 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2052 //this means we are returning a poly conditional from void-compatible lambda expression
2053 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2054 result = tree.type = types.createErrorType(resultInfo.pt);
2055 return;
2056 }
2057
2058 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2059 unknownExprInfo :
2060 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2061
2062
2063 // x ? y : z
2064 // include x's bindings when true in y
2065 // include x's bindings when false in z
2066
2067 Type truetype;
2068 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2069 try {
2070 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2071 } finally {
2072 trueEnv.info.scope.leave();
2073 }
2074
2075 MatchBindings trueBindings = matchBindings;
2076
2077 Type falsetype;
2078 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2079 try {
2080 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2081 } finally {
2082 falseEnv.info.scope.leave();
2083 }
2084
2085 MatchBindings falseBindings = matchBindings;
2086
2087 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2088 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2089 List.of(truetype, falsetype)) : pt();
2090 if (condtype.constValue() != null &&
2091 truetype.constValue() != null &&
2092 falsetype.constValue() != null &&
2093 !owntype.hasTag(NONE)) {
2094 //constant folding
2095 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2096 }
2097 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2098 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2099 }
2100 //where
2101 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2102 switch (tree.getTag()) {
2103 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2104 ((JCLiteral)tree).typetag == BOOLEAN ||
2105 ((JCLiteral)tree).typetag == BOT;
2106 case LAMBDA: case REFERENCE: return false;
2107 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2108 case CONDEXPR:
2109 JCConditional condTree = (JCConditional)tree;
2110 return isBooleanOrNumeric(env, condTree.truepart) &&
2111 isBooleanOrNumeric(env, condTree.falsepart);
2112 case APPLY:
2113 JCMethodInvocation speculativeMethodTree =
2114 (JCMethodInvocation)deferredAttr.attribSpeculative(
2115 tree, env, unknownExprInfo,
2116 argumentAttr.withLocalCacheContext());
2117 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2118 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2119 env.enclClass.type :
2120 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2121 Type owntype = types.memberType(receiverType, msym).getReturnType();
2122 return primitiveOrBoxed(owntype);
2123 case NEWCLASS:
2124 JCExpression className =
2125 removeClassParams.translate(((JCNewClass)tree).clazz);
2126 JCExpression speculativeNewClassTree =
2127 (JCExpression)deferredAttr.attribSpeculative(
2128 className, env, unknownTypeInfo,
2129 argumentAttr.withLocalCacheContext());
2130 return primitiveOrBoxed(speculativeNewClassTree.type);
2131 default:
2132 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2133 argumentAttr.withLocalCacheContext()).type;
2134 return primitiveOrBoxed(speculativeType);
2135 }
2136 }
2137 //where
2138 boolean primitiveOrBoxed(Type t) {
2139 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2140 }
2141
2142 TreeTranslator removeClassParams = new TreeTranslator() {
2143 @Override
2144 public void visitTypeApply(JCTypeApply tree) {
2145 result = translate(tree.clazz);
2146 }
2147 };
2148
2149 CheckContext conditionalContext(CheckContext checkContext) {
2150 return new Check.NestedCheckContext(checkContext) {
2151 //this will use enclosing check context to check compatibility of
2152 //subexpression against target type; if we are in a method check context,
2153 //depending on whether boxing is allowed, we could have incompatibilities
2154 @Override
2155 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2156 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2157 }
2158 };
2159 }
2160
2161 /** Compute the type of a conditional expression, after
2162 * checking that it exists. See JLS 15.25. Does not take into
2163 * account the special case where condition and both arms
2164 * are constants.
2165 *
2166 * @param pos The source position to be used for error
2167 * diagnostics.
2168 * @param thentype The type of the expression's then-part.
2169 * @param elsetype The type of the expression's else-part.
2170 */
2171 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2172 if (condTypes.isEmpty()) {
2173 return syms.objectType; //TODO: how to handle?
2174 }
2175 Type first = condTypes.head;
2176 // If same type, that is the result
2177 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2178 return first.baseType();
2179
2180 List<Type> unboxedTypes = condTypes.stream()
2181 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2182 .collect(List.collector());
2183
2184 // Otherwise, if both arms can be converted to a numeric
2185 // type, return the least numeric type that fits both arms
2186 // (i.e. return larger of the two, or return int if one
2187 // arm is short, the other is char).
2188 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2189 // If one arm has an integer subrange type (i.e., byte,
2190 // short, or char), and the other is an integer constant
2191 // that fits into the subrange, return the subrange type.
2192 for (Type type : unboxedTypes) {
2193 if (!type.getTag().isStrictSubRangeOf(INT)) {
2194 continue;
2195 }
2196 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2197 return type.baseType();
2198 }
2199
2200 for (TypeTag tag : primitiveTags) {
2201 Type candidate = syms.typeOfTag[tag.ordinal()];
2202 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2203 return candidate;
2204 }
2205 }
2206 }
2207
2208 // Those were all the cases that could result in a primitive. See if primitive boxing and primitive
2209 // value conversions bring about a convergence.
2210 condTypes = condTypes.stream()
2211 .map(t -> t.isPrimitive() ? types.boxedClass(t).type
2212 : t.isReferenceProjection() ? t.valueProjection() : t)
2213 .collect(List.collector());
2214
2215 for (Type type : condTypes) {
2216 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2217 return type.baseType();
2218 }
2219
2220 Iterator<DiagnosticPosition> posIt = positions.iterator();
2221
2222 condTypes = condTypes.stream()
2223 .map(t -> chk.checkNonVoid(posIt.next(), allowPrimitiveClasses && t.isPrimitiveClass() ? t.referenceProjection() : t))
2224 .collect(List.collector());
2225
2226 // both are known to be reference types (or projections). The result is
2227 // lub(thentype,elsetype). This cannot fail, as it will
2228 // always be possible to infer "Object" if nothing better.
2229 return types.lub(condTypes.stream()
2230 .map(t -> t.baseType())
2231 .filter(t -> !t.hasTag(BOT))
2232 .collect(List.collector()));
2233 }
2234
2235 static final TypeTag[] primitiveTags = new TypeTag[]{
2236 BYTE,
2237 CHAR,
2238 SHORT,
2239 INT,
2240 LONG,
2241 FLOAT,
2242 DOUBLE,
2243 BOOLEAN,
2244 };
2245
2246 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2247 return bindingEnv(env, env.tree, bindings);
2248 }
2249
2250 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2251 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2252 bindings.forEach(env1.info.scope::enter);
2253 return env1;
2254 }
2255
2256 public void visitIf(JCIf tree) {
2257 attribExpr(tree.cond, env, syms.booleanType);
2258
2259 // if (x) { y } [ else z ]
2260 // include x's bindings when true in y
2261 // include x's bindings when false in z
2262
2263 MatchBindings condBindings = matchBindings;
2264 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2265
2266 try {
2267 attribStat(tree.thenpart, thenEnv);
2268 } finally {
2269 thenEnv.info.scope.leave();
2270 }
2271
2272 preFlow(tree.thenpart);
2273 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2274 boolean aliveAfterElse;
2275
2276 if (tree.elsepart != null) {
2277 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2278 try {
2279 attribStat(tree.elsepart, elseEnv);
2280 } finally {
2281 elseEnv.info.scope.leave();
2282 }
2283 preFlow(tree.elsepart);
2284 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2285 } else {
2286 aliveAfterElse = true;
2287 }
2288
2289 chk.checkEmptyIf(tree);
2290
2291 List<BindingSymbol> afterIfBindings = List.nil();
2292
2293 if (aliveAfterThen && !aliveAfterElse) {
2294 afterIfBindings = condBindings.bindingsWhenTrue;
2295 } else if (aliveAfterElse && !aliveAfterThen) {
2296 afterIfBindings = condBindings.bindingsWhenFalse;
2297 }
2298
2299 addBindings2Scope(tree, afterIfBindings);
2300
2301 result = null;
2302 }
2303
2304 void preFlow(JCTree tree) {
2305 attrRecover.doRecovery();
2306 new PostAttrAnalyzer() {
2307 @Override
2308 public void scan(JCTree tree) {
2309 if (tree == null ||
2310 (tree.type != null &&
2311 tree.type == Type.stuckType)) {
2312 //don't touch stuck expressions!
2313 return;
2314 }
2315 super.scan(tree);
2316 }
2317
2318 @Override
2319 public void visitClassDef(JCClassDecl that) {
2320 if (that.sym != null) {
2321 // Method preFlow shouldn't visit class definitions
2322 // that have not been entered and attributed.
2323 // See JDK-8254557 and JDK-8203277 for more details.
2324 super.visitClassDef(that);
2325 }
2326 }
2327
2328 @Override
2329 public void visitLambda(JCLambda that) {
2330 if (that.type != null) {
2331 // Method preFlow shouldn't visit lambda expressions
2332 // that have not been entered and attributed.
2333 // See JDK-8254557 and JDK-8203277 for more details.
2334 super.visitLambda(that);
2335 }
2336 }
2337 }.scan(tree);
2338 }
2339
2340 public void visitExec(JCExpressionStatement tree) {
2341 //a fresh environment is required for 292 inference to work properly ---
2342 //see Infer.instantiatePolymorphicSignatureInstance()
2343 Env<AttrContext> localEnv = env.dup(tree);
2344 attribExpr(tree.expr, localEnv);
2345 result = null;
2346 }
2347
2348 public void visitBreak(JCBreak tree) {
2349 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2350 result = null;
2351 }
2352
2353 public void visitYield(JCYield tree) {
2354 if (env.info.yieldResult != null) {
2355 attribTree(tree.value, env, env.info.yieldResult);
2356 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2357 } else {
2358 log.error(tree.pos(), tree.value.hasTag(PARENS)
2359 ? Errors.NoSwitchExpressionQualify
2360 : Errors.NoSwitchExpression);
2361 attribTree(tree.value, env, unknownExprInfo);
2362 }
2363 result = null;
2364 }
2365
2366 public void visitContinue(JCContinue tree) {
2367 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2368 result = null;
2369 }
2370 //where
2371 /** Return the target of a break, continue or yield statement,
2372 * if it exists, report an error if not.
2373 * Note: The target of a labelled break or continue is the
2374 * (non-labelled) statement tree referred to by the label,
2375 * not the tree representing the labelled statement itself.
2376 *
2377 * @param pos The position to be used for error diagnostics
2378 * @param tag The tag of the jump statement. This is either
2379 * Tree.BREAK or Tree.CONTINUE.
2380 * @param label The label of the jump statement, or null if no
2381 * label is given.
2382 * @param env The environment current at the jump statement.
2383 */
2384 private JCTree findJumpTarget(DiagnosticPosition pos,
2385 JCTree.Tag tag,
2386 Name label,
2387 Env<AttrContext> env) {
2388 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2389
2390 if (jumpTarget.snd != null) {
2391 log.error(pos, jumpTarget.snd);
2392 }
2393
2394 return jumpTarget.fst;
2395 }
2396 /** Return the target of a break or continue statement, if it exists,
2397 * report an error if not.
2398 * Note: The target of a labelled break or continue is the
2399 * (non-labelled) statement tree referred to by the label,
2400 * not the tree representing the labelled statement itself.
2401 *
2402 * @param tag The tag of the jump statement. This is either
2403 * Tree.BREAK or Tree.CONTINUE.
2404 * @param label The label of the jump statement, or null if no
2405 * label is given.
2406 * @param env The environment current at the jump statement.
2407 */
2408 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2409 Name label,
2410 Env<AttrContext> env) {
2411 // Search environments outwards from the point of jump.
2412 Env<AttrContext> env1 = env;
2413 JCDiagnostic.Error pendingError = null;
2414 LOOP:
2415 while (env1 != null) {
2416 switch (env1.tree.getTag()) {
2417 case LABELLED:
2418 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2419 if (label == labelled.label) {
2420 // If jump is a continue, check that target is a loop.
2421 if (tag == CONTINUE) {
2422 if (!labelled.body.hasTag(DOLOOP) &&
2423 !labelled.body.hasTag(WHILELOOP) &&
2424 !labelled.body.hasTag(FORLOOP) &&
2425 !labelled.body.hasTag(FOREACHLOOP)) {
2426 pendingError = Errors.NotLoopLabel(label);
2427 }
2428 // Found labelled statement target, now go inwards
2429 // to next non-labelled tree.
2430 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2431 } else {
2432 return Pair.of(labelled, pendingError);
2433 }
2434 }
2435 break;
2436 case DOLOOP:
2437 case WHILELOOP:
2438 case FORLOOP:
2439 case FOREACHLOOP:
2440 if (label == null) return Pair.of(env1.tree, pendingError);
2441 break;
2442 case SWITCH:
2443 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2444 break;
2445 case SWITCH_EXPRESSION:
2446 if (tag == YIELD) {
2447 return Pair.of(env1.tree, null);
2448 } else if (tag == BREAK) {
2449 pendingError = Errors.BreakOutsideSwitchExpression;
2450 } else {
2451 pendingError = Errors.ContinueOutsideSwitchExpression;
2452 }
2453 break;
2454 case LAMBDA:
2455 case METHODDEF:
2456 case CLASSDEF:
2457 break LOOP;
2458 default:
2459 }
2460 env1 = env1.next;
2461 }
2462 if (label != null)
2463 return Pair.of(null, Errors.UndefLabel(label));
2464 else if (pendingError != null)
2465 return Pair.of(null, pendingError);
2466 else if (tag == CONTINUE)
2467 return Pair.of(null, Errors.ContOutsideLoop);
2468 else
2469 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2470 }
2471
2472 public void visitReturn(JCReturn tree) {
2473 // Check that there is an enclosing method which is
2474 // nested within than the enclosing class.
2475 if (env.info.returnResult == null) {
2476 log.error(tree.pos(), Errors.RetOutsideMeth);
2477 } else if (env.info.yieldResult != null) {
2478 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2479 } else if (!env.info.isLambda &&
2480 !env.info.isNewClass &&
2481 env.enclMethod != null &&
2482 TreeInfo.isCompactConstructor(env.enclMethod)) {
2483 log.error(env.enclMethod,
2484 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2485 } else {
2486 // Attribute return expression, if it exists, and check that
2487 // it conforms to result type of enclosing method.
2488 if (tree.expr != null) {
2489 if (env.info.returnResult.pt.hasTag(VOID)) {
2490 env.info.returnResult.checkContext.report(tree.expr.pos(),
2491 diags.fragment(Fragments.UnexpectedRetVal));
2492 }
2493 attribTree(tree.expr, env, env.info.returnResult);
2494 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2495 !env.info.returnResult.pt.hasTag(NONE)) {
2496 env.info.returnResult.checkContext.report(tree.pos(),
2497 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2498 }
2499 }
2500 result = null;
2501 }
2502
2503 public void visitThrow(JCThrow tree) {
2504 Type owntype = attribExpr(tree.expr, env, Type.noType);
2505 chk.checkType(tree, owntype, syms.throwableType);
2506 result = null;
2507 }
2508
2509 public void visitAssert(JCAssert tree) {
2510 attribExpr(tree.cond, env, syms.booleanType);
2511 if (tree.detail != null) {
2512 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2513 }
2514 result = null;
2515 }
2516
2517 /** Visitor method for method invocations.
2518 * NOTE: The method part of an application will have in its type field
2519 * the return type of the method, not the method's type itself!
2520 */
2521 public void visitApply(JCMethodInvocation tree) {
2522 // The local environment of a method application is
2523 // a new environment nested in the current one.
2524 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2525
2526 // The types of the actual method arguments.
2527 List<Type> argtypes;
2528
2529 // The types of the actual method type arguments.
2530 List<Type> typeargtypes = null;
2531
2532 Name methName = TreeInfo.name(tree.meth);
2533
2534 boolean isConstructorCall =
2535 methName == names._this || methName == names._super;
2536
2537 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2538 if (isConstructorCall) {
2539 // We are seeing a ...this(...) or ...super(...) call.
2540 // Check that this is the first statement in a constructor.
2541 checkFirstConstructorStat(tree, env.enclMethod, true);
2542
2543 // Record the fact
2544 // that this is a constructor call (using isSelfCall).
2545 localEnv.info.isSelfCall = true;
2546
2547 // Attribute arguments, yielding list of argument types.
2548 localEnv.info.constructorArgs = true;
2549 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2550 localEnv.info.constructorArgs = false;
2551 argtypes = argtypesBuf.toList();
2552 typeargtypes = attribTypes(tree.typeargs, localEnv);
2553
2554 // Variable `site' points to the class in which the called
2555 // constructor is defined.
2556 Type site = env.enclClass.sym.type;
2557 if (methName == names._super) {
2558 if (site == syms.objectType) {
2559 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2560 site = types.createErrorType(syms.objectType);
2561 } else {
2562 site = types.supertype(site);
2563 }
2564 }
2565
2566 if (site.hasTag(CLASS)) {
2567 Type encl = site.getEnclosingType();
2568 while (encl != null && encl.hasTag(TYPEVAR))
2569 encl = encl.getUpperBound();
2570 if (encl.hasTag(CLASS)) {
2571 // we are calling a nested class
2572
2573 if (tree.meth.hasTag(SELECT)) {
2574 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2575
2576 // We are seeing a prefixed call, of the form
2577 // <expr>.super(...).
2578 // Check that the prefix expression conforms
2579 // to the outer instance type of the class.
2580 chk.checkRefType(qualifier.pos(),
2581 attribExpr(qualifier, localEnv,
2582 encl));
2583 } else if (methName == names._super) {
2584 // qualifier omitted; check for existence
2585 // of an appropriate implicit qualifier.
2586 rs.resolveImplicitThis(tree.meth.pos(),
2587 localEnv, site, true);
2588 }
2589 } else if (tree.meth.hasTag(SELECT)) {
2590 log.error(tree.meth.pos(),
2591 Errors.IllegalQualNotIcls(site.tsym));
2592 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2593 }
2594
2595 // if we're calling a java.lang.Enum constructor,
2596 // prefix the implicit String and int parameters
2597 if (site.tsym == syms.enumSym)
2598 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2599
2600 // Resolve the called constructor under the assumption
2601 // that we are referring to a superclass instance of the
2602 // current instance (JLS ???).
2603 boolean selectSuperPrev = localEnv.info.selectSuper;
2604 localEnv.info.selectSuper = true;
2605 localEnv.info.pendingResolutionPhase = null;
2606 Symbol sym = rs.resolveConstructor(
2607 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2608 localEnv.info.selectSuper = selectSuperPrev;
2609
2610 // Set method symbol to resolved constructor...
2611 TreeInfo.setSymbol(tree.meth, sym);
2612
2613 // ...and check that it is legal in the current context.
2614 // (this will also set the tree's type)
2615 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2616 checkId(tree.meth, site, sym, localEnv,
2617 new ResultInfo(kind, mpt));
2618 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2619 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2620 }
2621 // Otherwise, `site' is an error type and we do nothing
2622 result = tree.type = syms.voidType;
2623 } else {
2624 // Otherwise, we are seeing a regular method call.
2625 // Attribute the arguments, yielding list of argument types, ...
2626 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2627 argtypes = argtypesBuf.toList();
2628 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2629
2630 // ... and attribute the method using as a prototype a methodtype
2631 // whose formal argument types is exactly the list of actual
2632 // arguments (this will also set the method symbol).
2633 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2634 localEnv.info.pendingResolutionPhase = null;
2635 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2636
2637 // Compute the result type.
2638 Type restype = mtype.getReturnType();
2639 if (restype.hasTag(WILDCARD))
2640 throw new AssertionError(mtype);
2641
2642 Type qualifier = (tree.meth.hasTag(SELECT))
2643 ? ((JCFieldAccess) tree.meth).selected.type
2644 : env.enclClass.sym.type;
2645 Symbol msym = TreeInfo.symbol(tree.meth);
2646 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2647
2648 chk.checkRefTypes(tree.typeargs, typeargtypes);
2649
2650 // Check that value of resulting type is admissible in the
2651 // current context. Also, capture the return type
2652 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2653 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2654 }
2655 chk.validate(tree.typeargs, localEnv);
2656 }
2657 //where
2658 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2659 if (msym != null &&
2660 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2661 methodName == names.getClass &&
2662 argtypes.isEmpty()) {
2663 // as a special case, x.getClass() has type Class<? extends |X|>
2664 // Special treatment for primitive classes: Given an expression v of type V where
2665 // V is a primitive class, v.getClass() is typed to be Class<? extends |V.ref|>
2666 Type wcb = types.erasure(allowPrimitiveClasses && qualifierType.isPrimitiveClass() ?
2667 qualifierType.referenceProjection() : qualifierType.baseType());
2668 return new ClassType(restype.getEnclosingType(),
2669 List.of(new WildcardType(wcb,
2670 BoundKind.EXTENDS,
2671 syms.boundClass)),
2672 restype.tsym,
2673 restype.getMetadata(),
2674 restype.getFlavor());
2675 } else if (msym != null &&
2676 msym.owner == syms.arrayClass &&
2677 methodName == names.clone &&
2678 types.isArray(qualifierType)) {
2679 // as a special case, array.clone() has a result that is
2680 // the same as static type of the array being cloned
2681 return qualifierType;
2682 } else {
2683 return restype;
2684 }
2685 }
2686
2687 /** Check that given application node appears as first statement
2688 * in a constructor call.
2689 * @param tree The application node
2690 * @param enclMethod The enclosing method of the application.
2691 * @param error Should an error be issued?
2692 */
2693 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2694 if (enclMethod != null && names.isInitOrVNew(enclMethod.name)) {
2695 JCBlock body = enclMethod.body;
2696 if (body.stats.head.hasTag(EXEC) &&
2697 ((JCExpressionStatement) body.stats.head).expr == tree)
2698 return true;
2699 }
2700 if (error) {
2701 log.error(tree.pos(),
2702 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2703 }
2704 return false;
2705 }
2706
2707 /** Obtain a method type with given argument types.
2708 */
2709 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2710 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2711 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2712 }
2713
2714 public void visitNewClass(final JCNewClass tree) {
2715 Type owntype = types.createErrorType(tree.type);
2716
2717 // The local environment of a class creation is
2718 // a new environment nested in the current one.
2719 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2720
2721 // The anonymous inner class definition of the new expression,
2722 // if one is defined by it.
2723 JCClassDecl cdef = tree.def;
2724
2725 // If enclosing class is given, attribute it, and
2726 // complete class name to be fully qualified
2727 JCExpression clazz = tree.clazz; // Class field following new
2728 JCExpression clazzid; // Identifier in class field
2729 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2730 annoclazzid = null;
2731
2732 if (clazz.hasTag(TYPEAPPLY)) {
2733 clazzid = ((JCTypeApply) clazz).clazz;
2734 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2735 annoclazzid = (JCAnnotatedType) clazzid;
2736 clazzid = annoclazzid.underlyingType;
2737 }
2738 } else {
2739 if (clazz.hasTag(ANNOTATED_TYPE)) {
2740 annoclazzid = (JCAnnotatedType) clazz;
2741 clazzid = annoclazzid.underlyingType;
2742 } else {
2743 clazzid = clazz;
2744 }
2745 }
2746
2747 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2748
2749 if (tree.encl != null) {
2750 // We are seeing a qualified new, of the form
2751 // <expr>.new C <...> (...) ...
2752 // In this case, we let clazz stand for the name of the
2753 // allocated class C prefixed with the type of the qualifier
2754 // expression, so that we can
2755 // resolve it with standard techniques later. I.e., if
2756 // <expr> has type T, then <expr>.new C <...> (...)
2757 // yields a clazz T.C.
2758 Type encltype = chk.checkRefType(tree.encl.pos(),
2759 attribExpr(tree.encl, env));
2760 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2761 // from expr to the combined type, or not? Yes, do this.
2762 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2763 ((JCIdent) clazzid).name);
2764
2765 EndPosTable endPosTable = this.env.toplevel.endPositions;
2766 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2767 if (clazz.hasTag(ANNOTATED_TYPE)) {
2768 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2769 List<JCAnnotation> annos = annoType.annotations;
2770
2771 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2772 clazzid1 = make.at(tree.pos).
2773 TypeApply(clazzid1,
2774 ((JCTypeApply) clazz).arguments);
2775 }
2776
2777 clazzid1 = make.at(tree.pos).
2778 AnnotatedType(annos, clazzid1);
2779 } else if (clazz.hasTag(TYPEAPPLY)) {
2780 clazzid1 = make.at(tree.pos).
2781 TypeApply(clazzid1,
2782 ((JCTypeApply) clazz).arguments);
2783 }
2784
2785 clazz = clazzid1;
2786 }
2787
2788 // Attribute clazz expression and store
2789 // symbol + type back into the attributed tree.
2790 Type clazztype;
2791
2792 try {
2793 env.info.isNewClass = true;
2794 clazztype = TreeInfo.isEnumInit(env.tree) ?
2795 attribIdentAsEnumType(env, (JCIdent)clazz) :
2796 attribType(clazz, env);
2797 } finally {
2798 env.info.isNewClass = false;
2799 }
2800
2801 clazztype = chk.checkDiamond(tree, clazztype);
2802 chk.validate(clazz, localEnv);
2803 if (tree.encl != null) {
2804 // We have to work in this case to store
2805 // symbol + type back into the attributed tree.
2806 tree.clazz.type = clazztype;
2807 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2808 clazzid.type = ((JCIdent) clazzid).sym.type;
2809 if (annoclazzid != null) {
2810 annoclazzid.type = clazzid.type;
2811 }
2812 if (!clazztype.isErroneous()) {
2813 if (cdef != null && clazztype.tsym.isInterface()) {
2814 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2815 } else if (clazztype.tsym.isStatic()) {
2816 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2817 }
2818 }
2819 } else if (!clazztype.tsym.isInterface() &&
2820 clazztype.getEnclosingType().hasTag(CLASS)) {
2821 // Check for the existence of an apropos outer instance
2822 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2823 }
2824
2825 // Attribute constructor arguments.
2826 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2827 final KindSelector pkind =
2828 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2829 List<Type> argtypes = argtypesBuf.toList();
2830 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2831
2832 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2833 // Enums may not be instantiated except implicitly
2834 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2835 (!env.tree.hasTag(VARDEF) ||
2836 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2837 ((JCVariableDecl) env.tree).init != tree))
2838 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2839
2840 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2841 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2842 boolean skipNonDiamondPath = false;
2843 // Check that it is an instantiation of a class and not a projection type
2844 if (allowPrimitiveClasses) {
2845 if (clazz.hasTag(SELECT)) {
2846 JCFieldAccess fieldAccess = (JCFieldAccess) clazz;
2847 if (fieldAccess.selected.type.isPrimitiveClass() &&
2848 (fieldAccess.name == names.ref || fieldAccess.name == names.val)) {
2849 log.error(tree.pos(), Errors.ProjectionCantBeInstantiated);
2850 }
2851 }
2852 }
2853 // Check that class is not abstract
2854 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2855 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2856 log.error(tree.pos(),
2857 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2858 skipNonDiamondPath = true;
2859 } else if (cdef != null && clazztype.tsym.isInterface()) {
2860 // Check that no constructor arguments are given to
2861 // anonymous classes implementing an interface
2862 if (!argtypes.isEmpty())
2863 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2864
2865 if (!typeargtypes.isEmpty())
2866 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2867
2868 // Error recovery: pretend no arguments were supplied.
2869 argtypes = List.nil();
2870 typeargtypes = List.nil();
2871 skipNonDiamondPath = true;
2872 }
2873 if (TreeInfo.isDiamond(tree)) {
2874 ClassType site = new ClassType(clazztype.getEnclosingType(),
2875 clazztype.tsym.type.getTypeArguments(),
2876 clazztype.tsym,
2877 clazztype.getMetadata(),
2878 clazztype.getFlavor());
2879
2880 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2881 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2882 diamondEnv.info.pendingResolutionPhase = null;
2883
2884 //if the type of the instance creation expression is a class type
2885 //apply method resolution inference (JLS 15.12.2.7). The return type
2886 //of the resolved constructor will be a partially instantiated type
2887 Symbol constructor = rs.resolveDiamond(tree.pos(),
2888 diamondEnv,
2889 site,
2890 argtypes,
2891 typeargtypes);
2892 tree.constructor = constructor.baseSymbol();
2893
2894 final TypeSymbol csym = clazztype.tsym;
2895 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2896 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2897 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2898 constructorType = checkId(tree, site,
2899 constructor,
2900 diamondEnv,
2901 diamondResult);
2902
2903 tree.clazz.type = types.createErrorType(clazztype);
2904 if (!constructorType.isErroneous()) {
2905 tree.clazz.type = clazz.type = constructorType.getReturnType();
2906 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2907 }
2908 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2909 }
2910
2911 // Resolve the called constructor under the assumption
2912 // that we are referring to a superclass instance of the
2913 // current instance (JLS ???).
2914 else if (!skipNonDiamondPath) {
2915 //the following code alters some of the fields in the current
2916 //AttrContext - hence, the current context must be dup'ed in
2917 //order to avoid downstream failures
2918 Env<AttrContext> rsEnv = localEnv.dup(tree);
2919 rsEnv.info.selectSuper = cdef != null;
2920 rsEnv.info.pendingResolutionPhase = null;
2921 tree.constructor = rs.resolveConstructor(
2922 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2923 if (cdef == null) { //do not check twice!
2924 tree.constructorType = checkId(tree,
2925 clazztype,
2926 tree.constructor,
2927 rsEnv,
2928 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2929 if (rsEnv.info.lastResolveVarargs())
2930 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2931 }
2932 }
2933
2934 if (cdef != null) {
2935 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2936 return;
2937 }
2938
2939 if (tree.constructor != null && tree.constructor.kind == MTH)
2940 owntype = clazztype;
2941 }
2942 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2943 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2944 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2945 //we need to wait for inference to finish and then replace inference vars in the constructor type
2946 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2947 instantiatedContext -> {
2948 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2949 });
2950 }
2951 chk.validate(tree.typeargs, localEnv);
2952 }
2953
2954 // where
2955 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2956 JCClassDecl cdef, Env<AttrContext> localEnv,
2957 List<Type> argtypes, List<Type> typeargtypes,
2958 KindSelector pkind) {
2959 // We are seeing an anonymous class instance creation.
2960 // In this case, the class instance creation
2961 // expression
2962 //
2963 // E.new <typeargs1>C<typargs2>(args) { ... }
2964 //
2965 // is represented internally as
2966 //
2967 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2968 //
2969 // This expression is then *transformed* as follows:
2970 //
2971 // (1) add an extends or implements clause
2972 // (2) add a constructor.
2973 //
2974 // For instance, if C is a class, and ET is the type of E,
2975 // the expression
2976 //
2977 // E.new <typeargs1>C<typargs2>(args) { ... }
2978 //
2979 // is translated to (where X is a fresh name and typarams is the
2980 // parameter list of the super constructor):
2981 //
2982 // new <typeargs1>X(<*nullchk*>E, args) where
2983 // X extends C<typargs2> {
2984 // <typarams> X(ET e, args) {
2985 // e.<typeargs1>super(args)
2986 // }
2987 // ...
2988 // }
2989 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2990 Type enclType = clazztype.getEnclosingType();
2991 if (enclType != null &&
2992 enclType.hasTag(CLASS) &&
2993 !chk.checkDenotable((ClassType)enclType)) {
2994 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2995 }
2996 final boolean isDiamond = TreeInfo.isDiamond(tree);
2997 if (isDiamond
2998 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2999 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3000 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3001 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3002 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3003 instantiatedContext -> {
3004 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3005 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3006 ResultInfo prevResult = this.resultInfo;
3007 try {
3008 this.resultInfo = resultInfoForClassDefinition;
3009 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3010 dupLocalEnv, argtypes, typeargtypes, pkind);
3011 } finally {
3012 this.resultInfo = prevResult;
3013 }
3014 });
3015 } else {
3016 if (isDiamond && clazztype.hasTag(CLASS)) {
3017 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3018 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3019 // One or more types inferred in the previous steps is non-denotable.
3020 Fragment fragment = Diamond(clazztype.tsym);
3021 log.error(tree.clazz.pos(),
3022 Errors.CantApplyDiamond1(
3023 fragment,
3024 invalidDiamondArgs.size() > 1 ?
3025 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3026 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3027 }
3028 // For <>(){}, inferred types must also be accessible.
3029 for (Type t : clazztype.getTypeArguments()) {
3030 rs.checkAccessibleType(env, t);
3031 }
3032 if (allowPrimitiveClasses) {
3033 chk.checkParameterizationByPrimitiveClass(tree, clazztype);
3034 }
3035 }
3036
3037 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3038 // false for isInterface call even when the original type is an interface.
3039 boolean implementing = clazztype.tsym.isInterface() ||
3040 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3041 clazztype.getOriginalType().tsym.isInterface();
3042
3043 if (implementing) {
3044 cdef.implementing = List.of(clazz);
3045 } else {
3046 cdef.extending = clazz;
3047 }
3048
3049 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3050 rs.isSerializable(clazztype)) {
3051 localEnv.info.isSerializable = true;
3052 }
3053
3054 attribStat(cdef, localEnv);
3055
3056 List<Type> finalargtypes;
3057 // If an outer instance is given,
3058 // prefix it to the constructor arguments
3059 // and delete it from the new expression
3060 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3061 finalargtypes = argtypes.prepend(tree.encl.type);
3062 } else {
3063 finalargtypes = argtypes;
3064 }
3065
3066 // Reassign clazztype and recompute constructor. As this necessarily involves
3067 // another attribution pass for deferred types in the case of <>, replicate
3068 // them. Original arguments have right decorations already.
3069 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3070 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3071 }
3072
3073 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3074 : cdef.sym.type;
3075 Symbol sym = tree.constructor = rs.resolveConstructor(
3076 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3077 Assert.check(!sym.kind.isResolutionError());
3078 tree.constructor = sym;
3079 tree.constructorType = checkId(tree,
3080 clazztype,
3081 tree.constructor,
3082 localEnv,
3083 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3084 }
3085 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3086 clazztype : types.createErrorType(tree.type);
3087 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3088 chk.validate(tree.typeargs, localEnv);
3089 }
3090
3091 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3092 return new Check.NestedCheckContext(checkContext) {
3093 @Override
3094 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3095 enclosingContext.report(clazz.clazz,
3096 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3097 }
3098 };
3099 }
3100
3101 /** Make an attributed null check tree.
3102 */
3103 public JCExpression makeNullCheck(JCExpression arg) {
3104 // optimization: new Outer() can never be null; skip null check
3105 if (arg.getTag() == NEWCLASS)
3106 return arg;
3107 // Likewise arg can't be null if it is a primitive class instance.
3108 if (allowPrimitiveClasses && arg.type.isPrimitiveClass())
3109 return arg;
3110 // optimization: X.this is never null; skip null check
3111 Name name = TreeInfo.name(arg);
3112 if (name == names._this || name == names._super) return arg;
3113
3114 JCTree.Tag optag = NULLCHK;
3115 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3116 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3117 tree.type = arg.type;
3118 return tree;
3119 }
3120
3121 public void visitNewArray(JCNewArray tree) {
3122 Type owntype = types.createErrorType(tree.type);
3123 Env<AttrContext> localEnv = env.dup(tree);
3124 Type elemtype;
3125 if (tree.elemtype != null) {
3126 elemtype = attribType(tree.elemtype, localEnv);
3127 chk.validate(tree.elemtype, localEnv);
3128 owntype = elemtype;
3129 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3130 attribExpr(l.head, localEnv, syms.intType);
3131 owntype = new ArrayType(owntype, syms.arrayClass);
3132 }
3133 } else {
3134 // we are seeing an untyped aggregate { ... }
3135 // this is allowed only if the prototype is an array
3136 if (pt().hasTag(ARRAY)) {
3137 elemtype = types.elemtype(pt());
3138 } else {
3139 if (!pt().hasTag(ERROR) &&
3140 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3141 log.error(tree.pos(),
3142 Errors.IllegalInitializerForType(pt()));
3143 }
3144 elemtype = types.createErrorType(pt());
3145 }
3146 }
3147 if (tree.elems != null) {
3148 attribExprs(tree.elems, localEnv, elemtype);
3149 owntype = new ArrayType(elemtype, syms.arrayClass);
3150 }
3151 if (!types.isReifiable(elemtype))
3152 log.error(tree.pos(), Errors.GenericArrayCreation);
3153 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3154 }
3155
3156 /*
3157 * A lambda expression can only be attributed when a target-type is available.
3158 * In addition, if the target-type is that of a functional interface whose
3159 * descriptor contains inference variables in argument position the lambda expression
3160 * is 'stuck' (see DeferredAttr).
3161 */
3162 @Override
3163 public void visitLambda(final JCLambda that) {
3164 boolean wrongContext = false;
3165 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3166 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3167 //lambda only allowed in assignment or method invocation/cast context
3168 log.error(that.pos(), Errors.UnexpectedLambda);
3169 }
3170 resultInfo = recoveryInfo;
3171 wrongContext = true;
3172 }
3173 //create an environment for attribution of the lambda expression
3174 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3175 boolean needsRecovery =
3176 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3177 try {
3178 if (needsRecovery && rs.isSerializable(pt())) {
3179 localEnv.info.isSerializable = true;
3180 localEnv.info.isSerializableLambda = true;
3181 }
3182 List<Type> explicitParamTypes = null;
3183 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3184 //attribute lambda parameters
3185 attribStats(that.params, localEnv);
3186 explicitParamTypes = TreeInfo.types(that.params);
3187 }
3188
3189 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3190 Type currentTarget = targetInfo.target;
3191 Type lambdaType = targetInfo.descriptor;
3192
3193 if (currentTarget.isErroneous()) {
3194 result = that.type = currentTarget;
3195 return;
3196 }
3197
3198 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3199
3200 if (lambdaType.hasTag(FORALL)) {
3201 //lambda expression target desc cannot be a generic method
3202 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3203 kindName(currentTarget.tsym),
3204 currentTarget.tsym);
3205 resultInfo.checkContext.report(that, diags.fragment(msg));
3206 result = that.type = types.createErrorType(pt());
3207 return;
3208 }
3209
3210 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3211 //add param type info in the AST
3212 List<Type> actuals = lambdaType.getParameterTypes();
3213 List<JCVariableDecl> params = that.params;
3214
3215 boolean arityMismatch = false;
3216
3217 while (params.nonEmpty()) {
3218 if (actuals.isEmpty()) {
3219 //not enough actuals to perform lambda parameter inference
3220 arityMismatch = true;
3221 }
3222 //reset previously set info
3223 Type argType = arityMismatch ?
3224 syms.errType :
3225 actuals.head;
3226 if (params.head.isImplicitlyTyped()) {
3227 setSyntheticVariableType(params.head, argType);
3228 }
3229 params.head.sym = null;
3230 actuals = actuals.isEmpty() ?
3231 actuals :
3232 actuals.tail;
3233 params = params.tail;
3234 }
3235
3236 //attribute lambda parameters
3237 attribStats(that.params, localEnv);
3238
3239 if (arityMismatch) {
3240 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3241 result = that.type = types.createErrorType(currentTarget);
3242 return;
3243 }
3244 }
3245
3246 //from this point on, no recovery is needed; if we are in assignment context
3247 //we will be able to attribute the whole lambda body, regardless of errors;
3248 //if we are in a 'check' method context, and the lambda is not compatible
3249 //with the target-type, it will be recovered anyway in Attr.checkId
3250 needsRecovery = false;
3251
3252 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3253 lambdaBodyResult(that, lambdaType, resultInfo);
3254
3255 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3256 attribTree(that.getBody(), localEnv, bodyResultInfo);
3257 } else {
3258 JCBlock body = (JCBlock)that.body;
3259 if (body == breakTree &&
3260 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3261 breakTreeFound(copyEnv(localEnv));
3262 }
3263 attribStats(body.stats, localEnv);
3264 }
3265
3266 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3267
3268 boolean isSpeculativeRound =
3269 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3270
3271 preFlow(that);
3272 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3273
3274 that.type = currentTarget; //avoids recovery at this stage
3275 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3276
3277 if (!isSpeculativeRound) {
3278 //add thrown types as bounds to the thrown types free variables if needed:
3279 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3280 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3281 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3282 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3283 }
3284 }
3285
3286 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3287 }
3288 result = wrongContext ? that.type = types.createErrorType(pt())
3289 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3290 } catch (Types.FunctionDescriptorLookupError ex) {
3291 JCDiagnostic cause = ex.getDiagnostic();
3292 resultInfo.checkContext.report(that, cause);
3293 result = that.type = types.createErrorType(pt());
3294 return;
3295 } catch (CompletionFailure cf) {
3296 chk.completionError(that.pos(), cf);
3297 } catch (Throwable t) {
3298 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3299 //as that would likely cause the same exception again.
3300 needsRecovery = false;
3301 throw t;
3302 } finally {
3303 localEnv.info.scope.leave();
3304 if (needsRecovery) {
3305 Type prevResult = result;
3306 try {
3307 attribTree(that, env, recoveryInfo);
3308 } finally {
3309 if (result == Type.recoveryType) {
3310 result = prevResult;
3311 }
3312 }
3313 }
3314 }
3315 }
3316 //where
3317 class TargetInfo {
3318 Type target;
3319 Type descriptor;
3320
3321 public TargetInfo(Type target, Type descriptor) {
3322 this.target = target;
3323 this.descriptor = descriptor;
3324 }
3325 }
3326
3327 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3328 Type lambdaType;
3329 Type currentTarget = resultInfo.pt;
3330 if (resultInfo.pt != Type.recoveryType) {
3331 /* We need to adjust the target. If the target is an
3332 * intersection type, for example: SAM & I1 & I2 ...
3333 * the target will be updated to SAM
3334 */
3335 currentTarget = targetChecker.visit(currentTarget, that);
3336 if (!currentTarget.isIntersection()) {
3337 if (explicitParamTypes != null) {
3338 currentTarget = infer.instantiateFunctionalInterface(that,
3339 currentTarget, explicitParamTypes, resultInfo.checkContext);
3340 }
3341 currentTarget = types.removeWildcards(currentTarget);
3342 lambdaType = types.findDescriptorType(currentTarget);
3343 } else {
3344 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3345 ListBuffer<Type> components = new ListBuffer<>();
3346 for (Type bound : ict.getExplicitComponents()) {
3347 if (explicitParamTypes != null) {
3348 try {
3349 bound = infer.instantiateFunctionalInterface(that,
3350 bound, explicitParamTypes, resultInfo.checkContext);
3351 } catch (FunctionDescriptorLookupError t) {
3352 // do nothing
3353 }
3354 }
3355 bound = types.removeWildcards(bound);
3356 components.add(bound);
3357 }
3358 currentTarget = types.makeIntersectionType(components.toList());
3359 currentTarget.tsym.flags_field |= INTERFACE;
3360 lambdaType = types.findDescriptorType(currentTarget);
3361 }
3362
3363 } else {
3364 currentTarget = Type.recoveryType;
3365 lambdaType = fallbackDescriptorType(that);
3366 }
3367 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3368 //lambda expression target desc cannot be a generic method
3369 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3370 kindName(currentTarget.tsym),
3371 currentTarget.tsym);
3372 resultInfo.checkContext.report(that, diags.fragment(msg));
3373 currentTarget = types.createErrorType(pt());
3374 }
3375 return new TargetInfo(currentTarget, lambdaType);
3376 }
3377
3378 void preFlow(JCLambda tree) {
3379 attrRecover.doRecovery();
3380 new PostAttrAnalyzer() {
3381 @Override
3382 public void scan(JCTree tree) {
3383 if (tree == null ||
3384 (tree.type != null &&
3385 tree.type == Type.stuckType)) {
3386 //don't touch stuck expressions!
3387 return;
3388 }
3389 super.scan(tree);
3390 }
3391
3392 @Override
3393 public void visitClassDef(JCClassDecl that) {
3394 // or class declaration trees!
3395 }
3396
3397 public void visitLambda(JCLambda that) {
3398 // or lambda expressions!
3399 }
3400 }.scan(tree.body);
3401 }
3402
3403 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3404
3405 @Override
3406 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3407 return t.isIntersection() ?
3408 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3409 }
3410
3411 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3412 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3413 return ict;
3414 }
3415
3416 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3417 ListBuffer<Type> targs = new ListBuffer<>();
3418 ListBuffer<Type> supertypes = new ListBuffer<>();
3419 for (Type i : ict.interfaces_field) {
3420 if (i.isParameterized()) {
3421 targs.appendList(i.tsym.type.allparams());
3422 }
3423 supertypes.append(i.tsym.type);
3424 }
3425 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3426 notionalIntf.allparams_field = targs.toList();
3427 notionalIntf.tsym.flags_field |= INTERFACE;
3428 return notionalIntf.tsym;
3429 }
3430 };
3431
3432 private Type fallbackDescriptorType(JCExpression tree) {
3433 switch (tree.getTag()) {
3434 case LAMBDA:
3435 JCLambda lambda = (JCLambda)tree;
3436 List<Type> argtypes = List.nil();
3437 for (JCVariableDecl param : lambda.params) {
3438 argtypes = param.vartype != null && param.vartype.type != null ?
3439 argtypes.append(param.vartype.type) :
3440 argtypes.append(syms.errType);
3441 }
3442 return new MethodType(argtypes, Type.recoveryType,
3443 List.of(syms.throwableType), syms.methodClass);
3444 case REFERENCE:
3445 return new MethodType(List.nil(), Type.recoveryType,
3446 List.of(syms.throwableType), syms.methodClass);
3447 default:
3448 Assert.error("Cannot get here!");
3449 }
3450 return null;
3451 }
3452
3453 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3454 final InferenceContext inferenceContext, final Type... ts) {
3455 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3456 }
3457
3458 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3459 final InferenceContext inferenceContext, final List<Type> ts) {
3460 if (inferenceContext.free(ts)) {
3461 inferenceContext.addFreeTypeListener(ts,
3462 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3463 } else {
3464 for (Type t : ts) {
3465 rs.checkAccessibleType(env, t);
3466 }
3467 }
3468 }
3469
3470 /**
3471 * Lambda/method reference have a special check context that ensures
3472 * that i.e. a lambda return type is compatible with the expected
3473 * type according to both the inherited context and the assignment
3474 * context.
3475 */
3476 class FunctionalReturnContext extends Check.NestedCheckContext {
3477
3478 FunctionalReturnContext(CheckContext enclosingContext) {
3479 super(enclosingContext);
3480 }
3481
3482 @Override
3483 public boolean compatible(Type found, Type req, Warner warn) {
3484 //return type must be compatible in both current context and assignment context
3485 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3486 }
3487
3488 @Override
3489 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3490 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3491 }
3492 }
3493
3494 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3495
3496 JCExpression expr;
3497 boolean expStmtExpected;
3498
3499 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3500 super(enclosingContext);
3501 this.expr = expr;
3502 }
3503
3504 @Override
3505 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3506 if (expStmtExpected) {
3507 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3508 } else {
3509 super.report(pos, details);
3510 }
3511 }
3512
3513 @Override
3514 public boolean compatible(Type found, Type req, Warner warn) {
3515 //a void return is compatible with an expression statement lambda
3516 if (req.hasTag(VOID)) {
3517 expStmtExpected = true;
3518 return TreeInfo.isExpressionStatement(expr);
3519 } else {
3520 return super.compatible(found, req, warn);
3521 }
3522 }
3523 }
3524
3525 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3526 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3527 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3528 new FunctionalReturnContext(resultInfo.checkContext);
3529
3530 return descriptor.getReturnType() == Type.recoveryType ?
3531 recoveryInfo :
3532 new ResultInfo(KindSelector.VAL,
3533 descriptor.getReturnType(), funcContext);
3534 }
3535
3536 /**
3537 * Lambda compatibility. Check that given return types, thrown types, parameter types
3538 * are compatible with the expected functional interface descriptor. This means that:
3539 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3540 * types must be compatible with the return type of the expected descriptor.
3541 */
3542 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3543 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3544
3545 //return values have already been checked - but if lambda has no return
3546 //values, we must ensure that void/value compatibility is correct;
3547 //this amounts at checking that, if a lambda body can complete normally,
3548 //the descriptor's return type must be void
3549 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3550 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3551 Fragment msg =
3552 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3553 checkContext.report(tree,
3554 diags.fragment(msg));
3555 }
3556
3557 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3558 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3559 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3560 }
3561 }
3562
3563 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3564 * static field and that lambda has type annotations, these annotations will
3565 * also be stored at these fake clinit methods.
3566 *
3567 * LambdaToMethod also use fake clinit methods so they can be reused.
3568 * Also as LTM is a phase subsequent to attribution, the methods from
3569 * clinits can be safely removed by LTM to save memory.
3570 */
3571 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3572
3573 public MethodSymbol removeClinit(ClassSymbol sym) {
3574 return clinits.remove(sym);
3575 }
3576
3577 /* This method returns an environment to be used to attribute a lambda
3578 * expression.
3579 *
3580 * The owner of this environment is a method symbol. If the current owner
3581 * is not a method, for example if the lambda is used to initialize
3582 * a field, then if the field is:
3583 *
3584 * - an instance field, we use the first constructor.
3585 * - a static field, we create a fake clinit method.
3586 */
3587 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3588 Env<AttrContext> lambdaEnv;
3589 Symbol owner = env.info.scope.owner;
3590 if (owner.kind == VAR && owner.owner.kind == TYP) {
3591 //field initializer
3592 ClassSymbol enclClass = owner.enclClass();
3593 Symbol newScopeOwner = env.info.scope.owner;
3594 /* if the field isn't static, then we can get the first constructor
3595 * and use it as the owner of the environment. This is what
3596 * LTM code is doing to look for type annotations so we are fine.
3597 */
3598 if ((owner.flags() & STATIC) == 0) {
3599 Name constructorName = owner.isConcreteValueClass() ? names.vnew : names.init;
3600 for (Symbol s : enclClass.members_field.getSymbolsByName(constructorName)) {
3601 newScopeOwner = s;
3602 break;
3603 }
3604 } else {
3605 /* if the field is static then we need to create a fake clinit
3606 * method, this method can later be reused by LTM.
3607 */
3608 MethodSymbol clinit = clinits.get(enclClass);
3609 if (clinit == null) {
3610 Type clinitType = new MethodType(List.nil(),
3611 syms.voidType, List.nil(), syms.methodClass);
3612 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3613 names.clinit, clinitType, enclClass);
3614 clinit.params = List.nil();
3615 clinits.put(enclClass, clinit);
3616 }
3617 newScopeOwner = clinit;
3618 }
3619 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3620 } else {
3621 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3622 }
3623 lambdaEnv.info.yieldResult = null;
3624 lambdaEnv.info.isLambda = true;
3625 return lambdaEnv;
3626 }
3627
3628 @Override
3629 public void visitReference(final JCMemberReference that) {
3630 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3631 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3632 //method reference only allowed in assignment or method invocation/cast context
3633 log.error(that.pos(), Errors.UnexpectedMref);
3634 }
3635 result = that.type = types.createErrorType(pt());
3636 return;
3637 }
3638 final Env<AttrContext> localEnv = env.dup(that);
3639 try {
3640 //attribute member reference qualifier - if this is a constructor
3641 //reference, the expected kind must be a type
3642 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3643
3644 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3645 exprType = chk.checkConstructorRefType(that.expr, exprType);
3646 if (!exprType.isErroneous() &&
3647 exprType.isRaw() &&
3648 that.typeargs != null) {
3649 log.error(that.expr.pos(),
3650 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3651 Fragments.MrefInferAndExplicitParams));
3652 exprType = types.createErrorType(exprType);
3653 }
3654 }
3655
3656 if (exprType.isErroneous()) {
3657 //if the qualifier expression contains problems,
3658 //give up attribution of method reference
3659 result = that.type = exprType;
3660 return;
3661 }
3662
3663 Symbol lhsSym = TreeInfo.symbol(that.expr);
3664 if (TreeInfo.isStaticSelector(that.expr, names)) {
3665 // TODO - a bit hacky but...
3666 if (lhsSym != null && lhsSym.isConcreteValueClass() && that.name == names.init) {
3667 that.name = names.vnew;
3668 }
3669 //if the qualifier is a type, validate it; raw warning check is
3670 //omitted as we don't know at this stage as to whether this is a
3671 //raw selector (because of inference)
3672 chk.validate(that.expr, env, false);
3673 } else {
3674 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3675 }
3676 //attrib type-arguments
3677 List<Type> typeargtypes = List.nil();
3678 if (that.typeargs != null) {
3679 typeargtypes = attribTypes(that.typeargs, localEnv);
3680 }
3681
3682 boolean isTargetSerializable =
3683 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3684 rs.isSerializable(pt());
3685 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3686 Type currentTarget = targetInfo.target;
3687 Type desc = targetInfo.descriptor;
3688
3689 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3690 List<Type> argtypes = desc.getParameterTypes();
3691 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3692
3693 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3694 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3695 }
3696
3697 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3698 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3699 try {
3700 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3701 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3702 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3703 } finally {
3704 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3705 }
3706
3707 Symbol refSym = refResult.fst;
3708 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3709
3710 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3711 * JDK-8075541
3712 */
3713 if (refSym.kind != MTH) {
3714 boolean targetError;
3715 switch (refSym.kind) {
3716 case ABSENT_MTH:
3717 case MISSING_ENCL:
3718 targetError = false;
3719 break;
3720 case WRONG_MTH:
3721 case WRONG_MTHS:
3722 case AMBIGUOUS:
3723 case HIDDEN:
3724 case STATICERR:
3725 targetError = true;
3726 break;
3727 default:
3728 Assert.error("unexpected result kind " + refSym.kind);
3729 targetError = false;
3730 }
3731
3732 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3733 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3734 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3735
3736 JCDiagnostic diag = diags.create(log.currentSource(), that,
3737 targetError ?
3738 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3739 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3740
3741 if (targetError && currentTarget == Type.recoveryType) {
3742 //a target error doesn't make sense during recovery stage
3743 //as we don't know what actual parameter types are
3744 result = that.type = currentTarget;
3745 return;
3746 } else {
3747 if (targetError) {
3748 resultInfo.checkContext.report(that, diag);
3749 } else {
3750 log.report(diag);
3751 }
3752 result = that.type = types.createErrorType(currentTarget);
3753 return;
3754 }
3755 }
3756
3757 that.sym = refSym.isInitOrVNew() ? refSym.baseSymbol() : refSym;
3758 that.kind = lookupHelper.referenceKind(that.sym);
3759 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3760
3761 if (desc.getReturnType() == Type.recoveryType) {
3762 // stop here
3763 result = that.type = currentTarget;
3764 return;
3765 }
3766
3767 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3768 Type enclosingType = exprType.getEnclosingType();
3769 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3770 // Check for the existence of an appropriate outer instance
3771 rs.resolveImplicitThis(that.pos(), env, exprType);
3772 }
3773 }
3774
3775 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3776
3777 if (that.getMode() == ReferenceMode.INVOKE &&
3778 TreeInfo.isStaticSelector(that.expr, names) &&
3779 that.kind.isUnbound() &&
3780 lookupHelper.site.isRaw()) {
3781 chk.checkRaw(that.expr, localEnv);
3782 }
3783
3784 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3785 exprType.getTypeArguments().nonEmpty()) {
3786 //static ref with class type-args
3787 log.error(that.expr.pos(),
3788 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3789 Fragments.StaticMrefWithTargs));
3790 result = that.type = types.createErrorType(currentTarget);
3791 return;
3792 }
3793
3794 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3795 // Check that super-qualified symbols are not abstract (JLS)
3796 rs.checkNonAbstract(that.pos(), that.sym);
3797 }
3798
3799 if (isTargetSerializable) {
3800 chk.checkAccessFromSerializableElement(that, true);
3801 }
3802 }
3803
3804 ResultInfo checkInfo =
3805 resultInfo.dup(newMethodTemplate(
3806 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3807 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3808 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3809
3810 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3811
3812 if (that.kind.isUnbound() &&
3813 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3814 //re-generate inference constraints for unbound receiver
3815 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3816 //cannot happen as this has already been checked - we just need
3817 //to regenerate the inference constraints, as that has been lost
3818 //as a result of the call to inferenceContext.save()
3819 Assert.error("Can't get here");
3820 }
3821 }
3822
3823 if (!refType.isErroneous()) {
3824 refType = types.createMethodTypeWithReturn(refType,
3825 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3826 }
3827
3828 //go ahead with standard method reference compatibility check - note that param check
3829 //is a no-op (as this has been taken care during method applicability)
3830 boolean isSpeculativeRound =
3831 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3832
3833 that.type = currentTarget; //avoids recovery at this stage
3834 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3835 if (!isSpeculativeRound) {
3836 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3837 }
3838 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3839 } catch (Types.FunctionDescriptorLookupError ex) {
3840 JCDiagnostic cause = ex.getDiagnostic();
3841 resultInfo.checkContext.report(that, cause);
3842 result = that.type = types.createErrorType(pt());
3843 return;
3844 }
3845 }
3846 //where
3847 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3848 //if this is a constructor reference, the expected kind must be a type
3849 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3850 KindSelector.VAL_TYP : KindSelector.TYP,
3851 Type.noType);
3852 }
3853
3854
3855 @SuppressWarnings("fallthrough")
3856 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3857 InferenceContext inferenceContext = checkContext.inferenceContext();
3858 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3859
3860 Type resType;
3861 switch (tree.getMode()) {
3862 case NEW:
3863 if (!tree.expr.type.isRaw()) {
3864 resType = tree.expr.type;
3865 break;
3866 }
3867 default:
3868 resType = refType.getReturnType();
3869 }
3870
3871 Type incompatibleReturnType = resType;
3872
3873 if (returnType.hasTag(VOID)) {
3874 incompatibleReturnType = null;
3875 }
3876
3877 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3878 if (resType.isErroneous() ||
3879 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3880 checkContext.checkWarner(tree, resType, returnType))) {
3881 incompatibleReturnType = null;
3882 }
3883 }
3884
3885 if (incompatibleReturnType != null) {
3886 Fragment msg =
3887 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3888 checkContext.report(tree, diags.fragment(msg));
3889 } else {
3890 if (inferenceContext.free(refType)) {
3891 // we need to wait for inference to finish and then replace inference vars in the referent type
3892 inferenceContext.addFreeTypeListener(List.of(refType),
3893 instantiatedContext -> {
3894 tree.referentType = instantiatedContext.asInstType(refType);
3895 });
3896 } else {
3897 tree.referentType = refType;
3898 }
3899 }
3900
3901 if (!speculativeAttr) {
3902 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3903 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3904 }
3905 }
3906 }
3907
3908 boolean checkExConstraints(
3909 List<Type> thrownByFuncExpr,
3910 List<Type> thrownAtFuncType,
3911 InferenceContext inferenceContext) {
3912 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3913 * are not proper types
3914 */
3915 List<Type> nonProperList = thrownAtFuncType.stream()
3916 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3917 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3918
3919 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3920 * in the throws clause of the invocation type of the method reference's compile-time
3921 * declaration
3922 */
3923 List<Type> checkedList = thrownByFuncExpr.stream()
3924 .filter(e -> chk.isChecked(e)).collect(List.collector());
3925
3926 /** If n = 0 (the function type's throws clause consists only of proper types), then
3927 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3928 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3929 * reduces to true
3930 */
3931 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3932 for (Type checked : checkedList) {
3933 boolean isSubtype = false;
3934 for (Type proper : properList) {
3935 if (types.isSubtype(checked, proper)) {
3936 isSubtype = true;
3937 break;
3938 }
3939 }
3940 if (!isSubtype) {
3941 uncaughtByProperTypes.add(checked);
3942 }
3943 }
3944
3945 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3946 return false;
3947 }
3948
3949 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3950 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3951 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3952 */
3953 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3954 uncaughtByProperTypes.forEach(checkedEx -> {
3955 nonProperAsUndet.forEach(nonProper -> {
3956 types.isSubtype(checkedEx, nonProper);
3957 });
3958 });
3959
3960 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3961 */
3962 nonProperAsUndet.stream()
3963 .filter(t -> t.hasTag(UNDETVAR))
3964 .forEach(t -> ((UndetVar)t).setThrow());
3965 return true;
3966 }
3967
3968 /**
3969 * Set functional type info on the underlying AST. Note: as the target descriptor
3970 * might contain inference variables, we might need to register an hook in the
3971 * current inference context.
3972 */
3973 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3974 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3975 if (checkContext.inferenceContext().free(descriptorType)) {
3976 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3977 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3978 inferenceContext.asInstType(primaryTarget), checkContext));
3979 } else {
3980 if (pt.hasTag(CLASS)) {
3981 fExpr.target = primaryTarget;
3982 }
3983 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3984 pt != Type.recoveryType) {
3985 //check that functional interface class is well-formed
3986 try {
3987 /* Types.makeFunctionalInterfaceClass() may throw an exception
3988 * when it's executed post-inference. See the listener code
3989 * above.
3990 */
3991 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3992 names.empty, fExpr.target, ABSTRACT);
3993 if (csym != null) {
3994 chk.checkImplementations(env.tree, csym, csym);
3995 try {
3996 //perform an additional functional interface check on the synthetic class,
3997 //as there may be spurious errors for raw targets - because of existing issues
3998 //with membership and inheritance (see JDK-8074570).
3999 csym.flags_field |= INTERFACE;
4000 types.findDescriptorType(csym.type);
4001 } catch (FunctionDescriptorLookupError err) {
4002 resultInfo.checkContext.report(fExpr,
4003 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4004 }
4005 }
4006 } catch (Types.FunctionDescriptorLookupError ex) {
4007 JCDiagnostic cause = ex.getDiagnostic();
4008 resultInfo.checkContext.report(env.tree, cause);
4009 }
4010 }
4011 }
4012 }
4013
4014 public void visitParens(JCParens tree) {
4015 Type owntype = attribTree(tree.expr, env, resultInfo);
4016 result = check(tree, owntype, pkind(), resultInfo);
4017 Symbol sym = TreeInfo.symbol(tree);
4018 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4019 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4020 }
4021
4022 public void visitAssign(JCAssign tree) {
4023 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4024 Type capturedType = capture(owntype);
4025 attribExpr(tree.rhs, env, owntype);
4026 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4027 }
4028
4029 public void visitAssignop(JCAssignOp tree) {
4030 // Attribute arguments.
4031 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4032 Type operand = attribExpr(tree.rhs, env);
4033 // Find operator.
4034 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4035 if (operator != operators.noOpSymbol &&
4036 !owntype.isErroneous() &&
4037 !operand.isErroneous()) {
4038 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4039 chk.checkCastable(tree.rhs.pos(),
4040 operator.type.getReturnType(),
4041 owntype);
4042 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4043 }
4044 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4045 }
4046
4047 public void visitUnary(JCUnary tree) {
4048 // Attribute arguments.
4049 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4050 ? attribTree(tree.arg, env, varAssignmentInfo)
4051 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4052
4053 // Find operator.
4054 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4055 Type owntype = types.createErrorType(tree.type);
4056 if (operator != operators.noOpSymbol &&
4057 !argtype.isErroneous()) {
4058 owntype = (tree.getTag().isIncOrDecUnaryOp())
4059 ? tree.arg.type
4060 : operator.type.getReturnType();
4061 int opc = operator.opcode;
4062
4063 // If the argument is constant, fold it.
4064 if (argtype.constValue() != null) {
4065 Type ctype = cfolder.fold1(opc, argtype);
4066 if (ctype != null) {
4067 owntype = cfolder.coerce(ctype, owntype);
4068 }
4069 }
4070 }
4071 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4072 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4073 }
4074
4075 public void visitBinary(JCBinary tree) {
4076 // Attribute arguments.
4077 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4078 // x && y
4079 // include x's bindings when true in y
4080
4081 // x || y
4082 // include x's bindings when false in y
4083
4084 MatchBindings lhsBindings = matchBindings;
4085 List<BindingSymbol> propagatedBindings;
4086 switch (tree.getTag()) {
4087 case AND:
4088 propagatedBindings = lhsBindings.bindingsWhenTrue;
4089 break;
4090 case OR:
4091 propagatedBindings = lhsBindings.bindingsWhenFalse;
4092 break;
4093 default:
4094 propagatedBindings = List.nil();
4095 break;
4096 }
4097 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4098 Type right;
4099 try {
4100 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4101 } finally {
4102 rhsEnv.info.scope.leave();
4103 }
4104
4105 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4106
4107 // Find operator.
4108 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4109 Type owntype = types.createErrorType(tree.type);
4110 if (operator != operators.noOpSymbol &&
4111 !left.isErroneous() &&
4112 !right.isErroneous()) {
4113 owntype = operator.type.getReturnType();
4114 int opc = operator.opcode;
4115 // If both arguments are constants, fold them.
4116 if (left.constValue() != null && right.constValue() != null) {
4117 Type ctype = cfolder.fold2(opc, left, right);
4118 if (ctype != null) {
4119 owntype = cfolder.coerce(ctype, owntype);
4120 }
4121 }
4122
4123 // Check that argument types of a reference ==, != are
4124 // castable to each other, (JLS 15.21). Note: unboxing
4125 // comparisons will not have an acmp* opc at this point.
4126 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4127 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4128 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4129 }
4130 }
4131
4132 chk.checkDivZero(tree.rhs.pos(), operator, right);
4133 }
4134 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4135 }
4136
4137 public void visitTypeCast(final JCTypeCast tree) {
4138 Type clazztype = attribType(tree.clazz, env);
4139 chk.validate(tree.clazz, env, false);
4140 //a fresh environment is required for 292 inference to work properly ---
4141 //see Infer.instantiatePolymorphicSignatureInstance()
4142 Env<AttrContext> localEnv = env.dup(tree);
4143 //should we propagate the target type?
4144 final ResultInfo castInfo;
4145 JCExpression expr = TreeInfo.skipParens(tree.expr);
4146 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4147 if (isPoly) {
4148 //expression is a poly - we need to propagate target type info
4149 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4150 new Check.NestedCheckContext(resultInfo.checkContext) {
4151 @Override
4152 public boolean compatible(Type found, Type req, Warner warn) {
4153 return types.isCastable(found, req, warn);
4154 }
4155 });
4156 } else {
4157 //standalone cast - target-type info is not propagated
4158 castInfo = unknownExprInfo;
4159 }
4160 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4161 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4162 if (exprtype.constValue() != null)
4163 owntype = cfolder.coerce(exprtype, owntype);
4164 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4165 if (!isPoly)
4166 chk.checkRedundantCast(localEnv, tree);
4167 }
4168
4169 public void visitTypeTest(JCInstanceOf tree) {
4170 Type exprtype = chk.checkNullOrRefType(
4171 tree.expr.pos(), attribExpr(tree.expr, env));
4172 Type clazztype;
4173 JCTree typeTree;
4174 if (tree.pattern.getTag() == BINDINGPATTERN ||
4175 tree.pattern.getTag() == RECORDPATTERN) {
4176 attribExpr(tree.pattern, env, exprtype);
4177 clazztype = tree.pattern.type;
4178 if (types.isSubtype(exprtype, clazztype) &&
4179 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4180 tree.pattern.getTag() != RECORDPATTERN) {
4181 if (!allowUnconditionalPatternsInstanceOf) {
4182 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4183 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4184 }
4185 }
4186 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4187 } else {
4188 clazztype = attribType(tree.pattern, env);
4189 typeTree = tree.pattern;
4190 chk.validate(typeTree, env, false);
4191 }
4192 if (!clazztype.hasTag(TYPEVAR)) {
4193 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4194 }
4195 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4196 boolean valid = false;
4197 if (allowReifiableTypesInInstanceof) {
4198 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4199 } else {
4200 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4201 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4202 allowReifiableTypesInInstanceof = true;
4203 }
4204 if (!valid) {
4205 clazztype = types.createErrorType(clazztype);
4206 }
4207 }
4208 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4209 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4210 }
4211
4212 private boolean checkCastablePattern(DiagnosticPosition pos,
4213 Type exprType,
4214 Type pattType) {
4215 Warner warner = new Warner();
4216 // if any type is erroneous, the problem is reported elsewhere
4217 if (exprType.isErroneous() || pattType.isErroneous()) {
4218 return false;
4219 }
4220 if (!types.isCastable(exprType, pattType, warner)) {
4221 chk.basicHandler.report(pos,
4222 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4223 return false;
4224 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4225 (!exprType.isPrimitive() ||
4226 !pattType.isPrimitive() ||
4227 !types.isSameType(exprType, pattType))) {
4228 chk.basicHandler.report(pos,
4229 diags.fragment(Fragments.NotApplicableTypes(exprType, pattType)));
4230 return false;
4231 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4232 log.error(pos,
4233 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4234 return false;
4235 } else {
4236 return true;
4237 }
4238 }
4239
4240 @Override
4241 public void visitAnyPattern(JCAnyPattern tree) {
4242 result = tree.type = resultInfo.pt;
4243 }
4244
4245 public void visitBindingPattern(JCBindingPattern tree) {
4246 Type type;
4247 if (tree.var.vartype != null) {
4248 type = attribType(tree.var.vartype, env);
4249 } else {
4250 type = resultInfo.pt;
4251 }
4252 tree.type = tree.var.type = type;
4253 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4254 v.pos = tree.pos;
4255 tree.var.sym = v;
4256 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4257 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4258 }
4259 if (tree.var.vartype != null) {
4260 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4261 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4262 annotate.flush();
4263 }
4264 chk.validate(tree.var.vartype, env, true);
4265 result = tree.type;
4266 if (v.isUnnamedVariable()) {
4267 matchBindings = MatchBindingsComputer.EMPTY;
4268 } else {
4269 matchBindings = new MatchBindings(List.of(v), List.nil());
4270 }
4271 }
4272
4273 @Override
4274 public void visitRecordPattern(JCRecordPattern tree) {
4275 Type site;
4276
4277 if (tree.deconstructor == null) {
4278 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4279 tree.record = syms.errSymbol;
4280 site = tree.type = types.createErrorType(tree.record.type);
4281 } else {
4282 Type type = attribType(tree.deconstructor, env);
4283 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4284 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4285 if (inferred == null) {
4286 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4287 } else {
4288 type = inferred;
4289 }
4290 }
4291 tree.type = tree.deconstructor.type = type;
4292 site = types.capture(tree.type);
4293 }
4294
4295 List<Type> expectedRecordTypes;
4296 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4297 ClassSymbol record = (ClassSymbol) site.tsym;
4298 expectedRecordTypes = record.getRecordComponents()
4299 .stream()
4300 .map(rc -> types.memberType(site, rc))
4301 .map(t -> types.upward(t, types.captures(t)).baseType())
4302 .collect(List.collector());
4303 tree.record = record;
4304 } else {
4305 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4306 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4307 .limit(tree.nested.size())
4308 .collect(List.collector());
4309 tree.record = syms.errSymbol;
4310 }
4311 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4312 List<Type> recordTypes = expectedRecordTypes;
4313 List<JCPattern> nestedPatterns = tree.nested;
4314 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4315 try {
4316 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4317 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4318 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4319 outBindings.addAll(matchBindings.bindingsWhenTrue);
4320 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4321 nestedPatterns = nestedPatterns.tail;
4322 recordTypes = recordTypes.tail;
4323 }
4324 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4325 while (nestedPatterns.nonEmpty()) {
4326 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4327 nestedPatterns = nestedPatterns.tail;
4328 }
4329 List<Type> nestedTypes =
4330 tree.nested.stream().map(p -> p.type).collect(List.collector());
4331 log.error(tree.pos(),
4332 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4333 nestedTypes));
4334 }
4335 } finally {
4336 localEnv.info.scope.leave();
4337 }
4338 chk.validate(tree.deconstructor, env, true);
4339 result = tree.type;
4340 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4341 }
4342
4343 public void visitIndexed(JCArrayAccess tree) {
4344 Type owntype = types.createErrorType(tree.type);
4345 Type atype = attribExpr(tree.indexed, env);
4346 attribExpr(tree.index, env, syms.intType);
4347 if (types.isArray(atype))
4348 owntype = types.elemtype(atype);
4349 else if (!atype.hasTag(ERROR))
4350 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4351 if (!pkind().contains(KindSelector.VAL))
4352 owntype = capture(owntype);
4353 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4354 }
4355
4356 public void visitIdent(JCIdent tree) {
4357 Symbol sym;
4358
4359 // Find symbol
4360 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4361 // If we are looking for a method, the prototype `pt' will be a
4362 // method type with the type of the call's arguments as parameters.
4363 env.info.pendingResolutionPhase = null;
4364 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4365 } else if (tree.sym != null && tree.sym.kind != VAR) {
4366 sym = tree.sym;
4367 } else {
4368 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4369 }
4370 tree.sym = sym;
4371
4372 // Also find the environment current for the class where
4373 // sym is defined (`symEnv').
4374 Env<AttrContext> symEnv = env;
4375 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4376 sym.kind.matches(KindSelector.VAL_MTH) &&
4377 sym.owner.kind == TYP &&
4378 tree.name != names._this && tree.name != names._super) {
4379
4380 // Find environment in which identifier is defined.
4381 while (symEnv.outer != null &&
4382 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4383 symEnv = symEnv.outer;
4384 }
4385 }
4386
4387 // If symbol is a variable, ...
4388 if (sym.kind == VAR) {
4389 VarSymbol v = (VarSymbol)sym;
4390
4391 // ..., evaluate its initializer, if it has one, and check for
4392 // illegal forward reference.
4393 checkInit(tree, env, v, false);
4394
4395 // If we are expecting a variable (as opposed to a value), check
4396 // that the variable is assignable in the current environment.
4397 if (KindSelector.ASG.subset(pkind()))
4398 checkAssignable(tree.pos(), v, null, env);
4399 }
4400
4401 // In a constructor body,
4402 // if symbol is a field or instance method, check that it is
4403 // not accessed before the supertype constructor is called.
4404 if (symEnv.info.isSelfCall &&
4405 sym.kind.matches(KindSelector.VAL_MTH) &&
4406 sym.owner.kind == TYP &&
4407 (sym.flags() & STATIC) == 0) {
4408 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4409 sym : thisSym(tree.pos(), env));
4410 }
4411 Env<AttrContext> env1 = env;
4412 if (sym.kind != ERR && sym.kind != TYP &&
4413 sym.owner != null && sym.owner != env1.enclClass.sym) {
4414 // If the found symbol is inaccessible, then it is
4415 // accessed through an enclosing instance. Locate this
4416 // enclosing instance:
4417 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4418 env1 = env1.outer;
4419 }
4420
4421 if (env.info.isSerializable) {
4422 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4423 }
4424
4425 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4426 }
4427
4428 public void visitSelect(JCFieldAccess tree) {
4429 // Determine the expected kind of the qualifier expression.
4430 KindSelector skind = KindSelector.NIL;
4431 if (tree.name == names._this || tree.name == names._super ||
4432 tree.name == names._class)
4433 {
4434 skind = KindSelector.TYP;
4435 } else {
4436 if (pkind().contains(KindSelector.PCK))
4437 skind = KindSelector.of(skind, KindSelector.PCK);
4438 if (pkind().contains(KindSelector.TYP))
4439 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4440 if (pkind().contains(KindSelector.VAL_MTH))
4441 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4442 }
4443
4444 // Attribute the qualifier expression, and determine its symbol (if any).
4445 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4446 Assert.check(site == tree.selected.type);
4447 if (allowPrimitiveClasses && tree.name == names._class && site.isPrimitiveClass()) {
4448 /* JDK-8269956: Where a reflective (class) literal is needed, the unqualified Point.class is
4449 * always the "primary" mirror - representing the primitive reference runtime type - thereby
4450 * always matching the behavior of Object::getClass
4451 */
4452 if (!tree.selected.hasTag(SELECT) || ((JCFieldAccess) tree.selected).name != names.val) {
4453 tree.selected.setType(site = site.referenceProjection());
4454 }
4455 }
4456 if (!pkind().contains(KindSelector.TYP_PCK))
4457 site = capture(site); // Capture field access
4458
4459 // don't allow T.class T[].class, etc
4460 if (skind == KindSelector.TYP) {
4461 Type elt = site;
4462 while (elt.hasTag(ARRAY))
4463 elt = ((ArrayType)elt).elemtype;
4464 if (elt.hasTag(TYPEVAR)) {
4465 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4466 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4467 tree.sym = tree.type.tsym;
4468 return;
4469 }
4470 }
4471
4472 // If qualifier symbol is a type or `super', assert `selectSuper'
4473 // for the selection. This is relevant for determining whether
4474 // protected symbols are accessible.
4475 Symbol sitesym = TreeInfo.symbol(tree.selected);
4476 boolean selectSuperPrev = env.info.selectSuper;
4477 env.info.selectSuper =
4478 sitesym != null &&
4479 sitesym.name == names._super;
4480
4481 // Determine the symbol represented by the selection.
4482 env.info.pendingResolutionPhase = null;
4483 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4484 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4485 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4486 sym = syms.errSymbol;
4487 }
4488 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4489 site = capture(site);
4490 sym = selectSym(tree, sitesym, site, env, resultInfo);
4491 }
4492 boolean varArgs = env.info.lastResolveVarargs();
4493 tree.sym = sym;
4494
4495 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4496 site = types.skipTypeVars(site, true);
4497 }
4498
4499 // If that symbol is a variable, ...
4500 if (sym.kind == VAR) {
4501 VarSymbol v = (VarSymbol)sym;
4502
4503 // ..., evaluate its initializer, if it has one, and check for
4504 // illegal forward reference.
4505 checkInit(tree, env, v, true);
4506
4507 // If we are expecting a variable (as opposed to a value), check
4508 // that the variable is assignable in the current environment.
4509 if (KindSelector.ASG.subset(pkind()))
4510 checkAssignable(tree.pos(), v, tree.selected, env);
4511 }
4512
4513 if (sitesym != null &&
4514 sitesym.kind == VAR &&
4515 ((VarSymbol)sitesym).isResourceVariable() &&
4516 sym.kind == MTH &&
4517 sym.name.equals(names.close) &&
4518 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4519 env.info.lint.isEnabled(LintCategory.TRY)) {
4520 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4521 }
4522
4523 // Disallow selecting a type from an expression
4524 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4525 tree.type = check(tree.selected, pt(),
4526 sitesym == null ?
4527 KindSelector.VAL : sitesym.kind.toSelector(),
4528 new ResultInfo(KindSelector.TYP_PCK, pt()));
4529 }
4530
4531 if (isType(sitesym)) {
4532 if (sym.name == names._this || sym.name == names._super) {
4533 // If `C' is the currently compiled class, check that
4534 // `C.this' does not appear in an explicit call to a constructor
4535 // also make sure that `super` is not used in constructor invocations
4536 if (env.info.isSelfCall &&
4537 ((sym.name == names._this &&
4538 site.tsym == env.enclClass.sym) ||
4539 sym.name == names._super && env.info.constructorArgs &&
4540 (sitesym.isInterface() || site.tsym == env.enclClass.sym))) {
4541 chk.earlyRefError(tree.pos(), sym);
4542 }
4543 } else {
4544 // Check if type-qualified fields or methods are static (JLS)
4545 if ((sym.flags() & STATIC) == 0 &&
4546 sym.name != names._super &&
4547 (sym.kind == VAR || sym.kind == MTH)) {
4548 rs.accessBase(rs.new StaticError(sym),
4549 tree.pos(), site, sym.name, true);
4550 }
4551 }
4552 } else if (sym.kind != ERR &&
4553 (sym.flags() & STATIC) != 0 &&
4554 sym.name != names._class) {
4555 // If the qualified item is not a type and the selected item is static, report
4556 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4557 if (!sym.owner.isAnonymous()) {
4558 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4559 } else {
4560 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4561 }
4562 }
4563
4564 // If we are selecting an instance member via a `super', ...
4565 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4566
4567 // Check that super-qualified symbols are not abstract (JLS)
4568 rs.checkNonAbstract(tree.pos(), sym);
4569
4570 if (site.isRaw()) {
4571 // Determine argument types for site.
4572 Type site1 = types.asSuper(env.enclClass.sym.type.referenceProjectionOrSelf(), site.tsym);
4573 if (site1 != null) site = site1;
4574 }
4575 }
4576
4577 if (env.info.isSerializable) {
4578 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4579 }
4580
4581 env.info.selectSuper = selectSuperPrev;
4582 result = checkId(tree, site, sym, env, resultInfo);
4583 }
4584 //where
4585 /** Determine symbol referenced by a Select expression,
4586 *
4587 * @param tree The select tree.
4588 * @param site The type of the selected expression,
4589 * @param env The current environment.
4590 * @param resultInfo The current result.
4591 */
4592 private Symbol selectSym(JCFieldAccess tree,
4593 Symbol location,
4594 Type site,
4595 Env<AttrContext> env,
4596 ResultInfo resultInfo) {
4597 DiagnosticPosition pos = tree.pos();
4598 Name name = tree.name;
4599 switch (site.getTag()) {
4600 case PACKAGE:
4601 return rs.accessBase(
4602 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4603 pos, location, site, name, true);
4604 case ARRAY:
4605 case CLASS:
4606 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4607 return rs.resolveQualifiedMethod(
4608 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4609 } else if (name == names._this || name == names._super) {
4610 return rs.resolveSelf(pos, env, site.tsym, name);
4611 } else if (name == names._class) {
4612 // In this case, we have already made sure in
4613 // visitSelect that qualifier expression is a type.
4614 return syms.getClassField(site, types);
4615 } else if (allowPrimitiveClasses && site.isPrimitiveClass() && isType(location) && resultInfo.pkind.contains(KindSelector.TYP) && (name == names.ref || name == names.val)) {
4616 return site.tsym;
4617 } else {
4618 // We are seeing a plain identifier as selector.
4619 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4620 sym = rs.accessBase(sym, pos, location, site, name, true);
4621 return sym;
4622 }
4623 case WILDCARD:
4624 throw new AssertionError(tree);
4625 case TYPEVAR:
4626 // Normally, site.getUpperBound() shouldn't be null.
4627 // It should only happen during memberEnter/attribBase
4628 // when determining the supertype which *must* be
4629 // done before attributing the type variables. In
4630 // other words, we are seeing this illegal program:
4631 // class B<T> extends A<T.foo> {}
4632 Symbol sym = (site.getUpperBound() != null)
4633 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4634 : null;
4635 if (sym == null) {
4636 log.error(pos, Errors.TypeVarCantBeDeref);
4637 return syms.errSymbol;
4638 } else {
4639 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4640 rs.new AccessError(env, site, sym) :
4641 sym;
4642 rs.accessBase(sym2, pos, location, site, name, true);
4643 return sym;
4644 }
4645 case ERROR:
4646 // preserve identifier names through errors
4647 return types.createErrorType(name, site.tsym, site).tsym;
4648 default:
4649 // The qualifier expression is of a primitive type -- only
4650 // .class is allowed for these.
4651 if (name == names._class) {
4652 // In this case, we have already made sure in Select that
4653 // qualifier expression is a type.
4654 return syms.getClassField(site, types);
4655 } else {
4656 log.error(pos, Errors.CantDeref(site));
4657 return syms.errSymbol;
4658 }
4659 }
4660 }
4661
4662 /** Determine type of identifier or select expression and check that
4663 * (1) the referenced symbol is not deprecated
4664 * (2) the symbol's type is safe (@see checkSafe)
4665 * (3) if symbol is a variable, check that its type and kind are
4666 * compatible with the prototype and protokind.
4667 * (4) if symbol is an instance field of a raw type,
4668 * which is being assigned to, issue an unchecked warning if its
4669 * type changes under erasure.
4670 * (5) if symbol is an instance method of a raw type, issue an
4671 * unchecked warning if its argument types change under erasure.
4672 * If checks succeed:
4673 * If symbol is a constant, return its constant type
4674 * else if symbol is a method, return its result type
4675 * otherwise return its type.
4676 * Otherwise return errType.
4677 *
4678 * @param tree The syntax tree representing the identifier
4679 * @param site If this is a select, the type of the selected
4680 * expression, otherwise the type of the current class.
4681 * @param sym The symbol representing the identifier.
4682 * @param env The current environment.
4683 * @param resultInfo The expected result
4684 */
4685 Type checkId(JCTree tree,
4686 Type site,
4687 Symbol sym,
4688 Env<AttrContext> env,
4689 ResultInfo resultInfo) {
4690 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4691 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4692 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4693 }
4694
4695 Type checkMethodIdInternal(JCTree tree,
4696 Type site,
4697 Symbol sym,
4698 Env<AttrContext> env,
4699 ResultInfo resultInfo) {
4700 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4701 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4702 } else {
4703 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4704 }
4705 }
4706
4707 Type checkIdInternal(JCTree tree,
4708 Type site,
4709 Symbol sym,
4710 Type pt,
4711 Env<AttrContext> env,
4712 ResultInfo resultInfo) {
4713 if (pt.isErroneous()) {
4714 return types.createErrorType(site);
4715 }
4716 Type owntype; // The computed type of this identifier occurrence.
4717 switch (sym.kind) {
4718 case TYP:
4719 // For types, the computed type equals the symbol's type,
4720 // except for three situations:
4721 owntype = sym.type;
4722 if (owntype.hasTag(CLASS)) {
4723 if (allowPrimitiveClasses) {
4724 Assert.check(owntype.getFlavor() != Flavor.X_Typeof_X);
4725 }
4726 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4727 Type ownOuter = owntype.getEnclosingType();
4728
4729 // (a) If symbol is a primitive class and its reference projection
4730 // is requested via the .ref notation, then adjust the computed type to
4731 // reflect this.
4732 if (allowPrimitiveClasses && owntype.isPrimitiveClass() && tree.hasTag(SELECT) && ((JCFieldAccess) tree).name == names.ref) {
4733 owntype = new ClassType(owntype.getEnclosingType(), owntype.getTypeArguments(), (TypeSymbol)sym, owntype.getMetadata(), Flavor.L_TypeOf_Q);
4734 }
4735
4736 // (b) If the symbol's type is parameterized, erase it
4737 // because no type parameters were given.
4738 // We recover generic outer type later in visitTypeApply.
4739 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4740 owntype = types.erasure(owntype);
4741 }
4742
4743 // (c) If the symbol's type is an inner class, then
4744 // we have to interpret its outer type as a superclass
4745 // of the site type. Example:
4746 //
4747 // class Tree<A> { class Visitor { ... } }
4748 // class PointTree extends Tree<Point> { ... }
4749 // ...PointTree.Visitor...
4750 //
4751 // Then the type of the last expression above is
4752 // Tree<Point>.Visitor.
4753 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4754 Type normOuter = site;
4755 if (normOuter.hasTag(CLASS)) {
4756 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4757 }
4758 if (normOuter == null) // perhaps from an import
4759 normOuter = types.erasure(ownOuter);
4760 if (normOuter != ownOuter)
4761 owntype = new ClassType(
4762 normOuter, List.nil(), owntype.tsym,
4763 owntype.getMetadata(), owntype.getFlavor());
4764 }
4765 }
4766 break;
4767 case VAR:
4768 VarSymbol v = (VarSymbol)sym;
4769
4770 if (env.info.enclVar != null
4771 && v.type.hasTag(NONE)) {
4772 //self reference to implicitly typed variable declaration
4773 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4774 return tree.type = v.type = types.createErrorType(v.type);
4775 }
4776
4777 // Test (4): if symbol is an instance field of a raw type,
4778 // which is being assigned to, issue an unchecked warning if
4779 // its type changes under erasure.
4780 if (KindSelector.ASG.subset(pkind()) &&
4781 v.owner.kind == TYP &&
4782 (v.flags() & STATIC) == 0 &&
4783 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4784 Type s = types.asOuterSuper(site, v.owner);
4785 if (s != null &&
4786 s.isRaw() &&
4787 !types.isSameType(v.type, v.erasure(types))) {
4788 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4789 }
4790 }
4791 // The computed type of a variable is the type of the
4792 // variable symbol, taken as a member of the site type.
4793 owntype = (sym.owner.kind == TYP &&
4794 sym.name != names._this && sym.name != names._super)
4795 ? types.memberType(site, sym)
4796 : sym.type;
4797
4798 // If the variable is a constant, record constant value in
4799 // computed type.
4800 if (v.getConstValue() != null && isStaticReference(tree))
4801 owntype = owntype.constType(v.getConstValue());
4802
4803 if (resultInfo.pkind == KindSelector.VAL) {
4804 owntype = capture(owntype); // capture "names as expressions"
4805 }
4806 break;
4807 case MTH: {
4808 owntype = checkMethod(site, sym,
4809 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4810 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4811 resultInfo.pt.getTypeArguments());
4812 break;
4813 }
4814 case PCK: case ERR:
4815 owntype = sym.type;
4816 break;
4817 default:
4818 throw new AssertionError("unexpected kind: " + sym.kind +
4819 " in tree " + tree);
4820 }
4821
4822 // Emit a `deprecation' warning if symbol is deprecated.
4823 // (for constructors (but not for constructor references), the error
4824 // was given when the constructor was resolved)
4825
4826 if (!names.isInitOrVNew(sym.name) || tree.hasTag(REFERENCE)) {
4827 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4828 chk.checkSunAPI(tree.pos(), sym);
4829 chk.checkProfile(tree.pos(), sym);
4830 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4831 }
4832
4833 // If symbol is a variable, check that its type and
4834 // kind are compatible with the prototype and protokind.
4835 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4836 }
4837
4838 /** Check that variable is initialized and evaluate the variable's
4839 * initializer, if not yet done. Also check that variable is not
4840 * referenced before it is defined.
4841 * @param tree The tree making up the variable reference.
4842 * @param env The current environment.
4843 * @param v The variable's symbol.
4844 */
4845 private void checkInit(JCTree tree,
4846 Env<AttrContext> env,
4847 VarSymbol v,
4848 boolean onlyWarning) {
4849 // A forward reference is diagnosed if the declaration position
4850 // of the variable is greater than the current tree position
4851 // and the tree and variable definition occur in the same class
4852 // definition. Note that writes don't count as references.
4853 // This check applies only to class and instance
4854 // variables. Local variables follow different scope rules,
4855 // and are subject to definite assignment checking.
4856 Env<AttrContext> initEnv = enclosingInitEnv(env);
4857 if (initEnv != null &&
4858 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4859 v.owner.kind == TYP &&
4860 v.owner == env.info.scope.owner.enclClass() &&
4861 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4862 (!env.tree.hasTag(ASSIGN) ||
4863 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4864 if (!onlyWarning || isStaticEnumField(v)) {
4865 Error errkey = (initEnv.info.enclVar == v) ?
4866 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4867 log.error(tree.pos(), errkey);
4868 } else if (useBeforeDeclarationWarning) {
4869 Warning warnkey = (initEnv.info.enclVar == v) ?
4870 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4871 log.warning(tree.pos(), warnkey);
4872 }
4873 }
4874
4875 v.getConstValue(); // ensure initializer is evaluated
4876
4877 checkEnumInitializer(tree, env, v);
4878 }
4879
4880 /**
4881 * Returns the enclosing init environment associated with this env (if any). An init env
4882 * can be either a field declaration env or a static/instance initializer env.
4883 */
4884 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4885 while (true) {
4886 switch (env.tree.getTag()) {
4887 case VARDEF:
4888 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4889 if (vdecl.sym.owner.kind == TYP) {
4890 //field
4891 return env;
4892 }
4893 break;
4894 case BLOCK:
4895 if (env.next.tree.hasTag(CLASSDEF)) {
4896 //instance/static initializer
4897 return env;
4898 }
4899 break;
4900 case METHODDEF:
4901 case CLASSDEF:
4902 case TOPLEVEL:
4903 return null;
4904 }
4905 Assert.checkNonNull(env.next);
4906 env = env.next;
4907 }
4908 }
4909
4910 /**
4911 * Check for illegal references to static members of enum. In
4912 * an enum type, constructors and initializers may not
4913 * reference its static members unless they are constant.
4914 *
4915 * @param tree The tree making up the variable reference.
4916 * @param env The current environment.
4917 * @param v The variable's symbol.
4918 * @jls 8.9 Enum Types
4919 */
4920 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4921 // JLS:
4922 //
4923 // "It is a compile-time error to reference a static field
4924 // of an enum type that is not a compile-time constant
4925 // (15.28) from constructors, instance initializer blocks,
4926 // or instance variable initializer expressions of that
4927 // type. It is a compile-time error for the constructors,
4928 // instance initializer blocks, or instance variable
4929 // initializer expressions of an enum constant e to refer
4930 // to itself or to an enum constant of the same type that
4931 // is declared to the right of e."
4932 if (isStaticEnumField(v)) {
4933 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4934
4935 if (enclClass == null || enclClass.owner == null)
4936 return;
4937
4938 // See if the enclosing class is the enum (or a
4939 // subclass thereof) declaring v. If not, this
4940 // reference is OK.
4941 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4942 return;
4943
4944 // If the reference isn't from an initializer, then
4945 // the reference is OK.
4946 if (!Resolve.isInitializer(env))
4947 return;
4948
4949 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4950 }
4951 }
4952
4953 /** Is the given symbol a static, non-constant field of an Enum?
4954 * Note: enum literals should not be regarded as such
4955 */
4956 private boolean isStaticEnumField(VarSymbol v) {
4957 return Flags.isEnum(v.owner) &&
4958 Flags.isStatic(v) &&
4959 !Flags.isConstant(v) &&
4960 v.name != names._class;
4961 }
4962
4963 /**
4964 * Check that method arguments conform to its instantiation.
4965 **/
4966 public Type checkMethod(Type site,
4967 final Symbol sym,
4968 ResultInfo resultInfo,
4969 Env<AttrContext> env,
4970 final List<JCExpression> argtrees,
4971 List<Type> argtypes,
4972 List<Type> typeargtypes) {
4973 // Test (5): if symbol is an instance method of a raw type, issue
4974 // an unchecked warning if its argument types change under erasure.
4975 if ((sym.flags() & STATIC) == 0 &&
4976 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4977 Type s = types.asOuterSuper(site, sym.owner);
4978 if (s != null && s.isRaw() &&
4979 !types.isSameTypes(sym.type.getParameterTypes(),
4980 sym.erasure(types).getParameterTypes())) {
4981 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4982 }
4983 }
4984
4985 if (env.info.defaultSuperCallSite != null) {
4986 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4987 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4988 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4989 List<MethodSymbol> icand_sup =
4990 types.interfaceCandidates(sup, (MethodSymbol)sym);
4991 if (icand_sup.nonEmpty() &&
4992 icand_sup.head != sym &&
4993 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4994 log.error(env.tree.pos(),
4995 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4996 break;
4997 }
4998 }
4999 env.info.defaultSuperCallSite = null;
5000 }
5001
5002 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5003 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5004 if (app.meth.hasTag(SELECT) &&
5005 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5006 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5007 }
5008 }
5009
5010 // Compute the identifier's instantiated type.
5011 // For methods, we need to compute the instance type by
5012 // Resolve.instantiate from the symbol's type as well as
5013 // any type arguments and value arguments.
5014 Warner noteWarner = new Warner();
5015 try {
5016 Type owntype = rs.checkMethod(
5017 env,
5018 site,
5019 sym,
5020 resultInfo,
5021 argtypes,
5022 typeargtypes,
5023 noteWarner);
5024
5025 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5026 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5027
5028 argtypes = argtypes.map(checkDeferredMap);
5029
5030 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5031 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
5032 sym.name,
5033 rs.methodArguments(sym.type.getParameterTypes()),
5034 rs.methodArguments(argtypes.map(checkDeferredMap)),
5035 kindName(sym.location()),
5036 sym.location()));
5037 if (resultInfo.pt != Infer.anyPoly ||
5038 !owntype.hasTag(METHOD) ||
5039 !owntype.isPartial()) {
5040 //if this is not a partially inferred method type, erase return type. Otherwise,
5041 //erasure is carried out in PartiallyInferredMethodType.check().
5042 owntype = new MethodType(owntype.getParameterTypes(),
5043 types.erasure(owntype.getReturnType()),
5044 types.erasure(owntype.getThrownTypes()),
5045 syms.methodClass);
5046 }
5047 }
5048
5049 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5050 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5051 PolyKind.POLY : PolyKind.STANDALONE;
5052 TreeInfo.setPolyKind(env.tree, pkind);
5053
5054 return (resultInfo.pt == Infer.anyPoly) ?
5055 owntype :
5056 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5057 resultInfo.checkContext.inferenceContext());
5058 } catch (Infer.InferenceException ex) {
5059 //invalid target type - propagate exception outwards or report error
5060 //depending on the current check context
5061 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5062 return types.createErrorType(site);
5063 } catch (Resolve.InapplicableMethodException ex) {
5064 final JCDiagnostic diag = ex.getDiagnostic();
5065 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5066 @Override
5067 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5068 return new Pair<>(sym, diag);
5069 }
5070 };
5071 List<Type> argtypes2 = argtypes.map(
5072 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5073 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5074 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5075 log.report(errDiag);
5076 return types.createErrorType(site);
5077 }
5078 }
5079
5080 public void visitDefaultValue(JCDefaultValue tree) {
5081 if (!allowPrimitiveClasses) {
5082 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
5083 Feature.PRIMITIVE_CLASSES.error(sourceName));
5084 }
5085
5086 // Attribute the qualifier expression, and determine its symbol (if any).
5087 Type site = attribTree(tree.clazz, env, new ResultInfo(KindSelector.TYP_PCK, Type.noType));
5088 if (!pkind().contains(KindSelector.TYP_PCK))
5089 site = capture(site); // Capture field access
5090 if (!allowPrimitiveClasses) {
5091 result = types.createErrorType(names._default, site.tsym, site);
5092 } else {
5093 Symbol sym = switch (site.getTag()) {
5094 case WILDCARD -> throw new AssertionError(tree);
5095 case PACKAGE -> {
5096 log.error(tree.pos, Errors.CantResolveLocation(Kinds.KindName.CLASS, site.tsym.getQualifiedName(), null, null,
5097 Fragments.Location(Kinds.typeKindName(env.enclClass.type), env.enclClass.type, null)));
5098 yield syms.errSymbol;
5099 }
5100 case ERROR -> types.createErrorType(names._default, site.tsym, site).tsym;
5101 default -> new VarSymbol(STATIC, names._default, site, site.tsym);
5102 };
5103
5104 if (site.hasTag(TYPEVAR) && sym.kind != ERR) {
5105 site = types.skipTypeVars(site, true);
5106 }
5107 result = checkId(tree, site, sym, env, resultInfo);
5108 }
5109 }
5110
5111 public void visitLiteral(JCLiteral tree) {
5112 result = check(tree, litType(tree.typetag).constType(tree.value),
5113 KindSelector.VAL, resultInfo);
5114 }
5115 //where
5116 /** Return the type of a literal with given type tag.
5117 */
5118 Type litType(TypeTag tag) {
5119 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5120 }
5121
5122 public void visitStringTemplate(JCStringTemplate tree) {
5123 JCExpression processor = tree.processor;
5124 Type resultType = syms.stringTemplateType;
5125
5126 if (processor != null) {
5127 resultType = attribTree(processor, env, new ResultInfo(KindSelector.VAL, Type.noType));
5128 resultType = chk.checkProcessorType(processor, resultType, env);
5129 }
5130
5131 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
5132
5133 for (JCExpression arg : tree.expressions) {
5134 chk.checkNonVoid(arg.pos(), attribExpr(arg, localEnv));
5135 }
5136
5137 tree.type = resultType;
5138 result = resultType;
5139
5140 check(tree, resultType, KindSelector.VAL, resultInfo);
5141 }
5142
5143 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5144 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5145 }
5146
5147 public void visitTypeArray(JCArrayTypeTree tree) {
5148 Type etype = attribType(tree.elemtype, env);
5149 Type type = new ArrayType(etype, syms.arrayClass);
5150 result = check(tree, type, KindSelector.TYP, resultInfo);
5151 }
5152
5153 /** Visitor method for parameterized types.
5154 * Bound checking is left until later, since types are attributed
5155 * before supertype structure is completely known
5156 */
5157 public void visitTypeApply(JCTypeApply tree) {
5158 Type owntype = types.createErrorType(tree.type);
5159
5160 // Attribute functor part of application and make sure it's a class.
5161 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5162
5163 // Attribute type parameters
5164 List<Type> actuals = attribTypes(tree.arguments, env);
5165
5166 if (clazztype.hasTag(CLASS)) {
5167 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5168 if (actuals.isEmpty()) //diamond
5169 actuals = formals;
5170
5171 if (actuals.length() == formals.length()) {
5172 List<Type> a = actuals;
5173 List<Type> f = formals;
5174 while (a.nonEmpty()) {
5175 a.head = a.head.withTypeVar(f.head);
5176 a = a.tail;
5177 f = f.tail;
5178 }
5179 // Compute the proper generic outer
5180 Type clazzOuter = clazztype.getEnclosingType();
5181 if (clazzOuter.hasTag(CLASS)) {
5182 Type site;
5183 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5184 if (clazz.hasTag(IDENT)) {
5185 site = env.enclClass.sym.type;
5186 } else if (clazz.hasTag(SELECT)) {
5187 site = ((JCFieldAccess) clazz).selected.type;
5188 } else throw new AssertionError(""+tree);
5189 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5190 if (site.hasTag(CLASS))
5191 site = types.asOuterSuper(site, clazzOuter.tsym);
5192 if (site == null)
5193 site = types.erasure(clazzOuter);
5194 clazzOuter = site;
5195 }
5196 }
5197 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5198 clazztype.getMetadata(), clazztype.getFlavor());
5199 } else {
5200 if (formals.length() != 0) {
5201 log.error(tree.pos(),
5202 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5203 } else {
5204 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5205 }
5206 owntype = types.createErrorType(tree.type);
5207 }
5208 }
5209 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5210 }
5211
5212 public void visitTypeUnion(JCTypeUnion tree) {
5213 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5214 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5215 for (JCExpression typeTree : tree.alternatives) {
5216 Type ctype = attribType(typeTree, env);
5217 ctype = chk.checkType(typeTree.pos(),
5218 chk.checkClassType(typeTree.pos(), ctype),
5219 syms.throwableType);
5220 if (!ctype.isErroneous()) {
5221 //check that alternatives of a union type are pairwise
5222 //unrelated w.r.t. subtyping
5223 if (chk.intersects(ctype, multicatchTypes.toList())) {
5224 for (Type t : multicatchTypes) {
5225 boolean sub = types.isSubtype(ctype, t);
5226 boolean sup = types.isSubtype(t, ctype);
5227 if (sub || sup) {
5228 //assume 'a' <: 'b'
5229 Type a = sub ? ctype : t;
5230 Type b = sub ? t : ctype;
5231 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5232 }
5233 }
5234 }
5235 multicatchTypes.append(ctype);
5236 if (all_multicatchTypes != null)
5237 all_multicatchTypes.append(ctype);
5238 } else {
5239 if (all_multicatchTypes == null) {
5240 all_multicatchTypes = new ListBuffer<>();
5241 all_multicatchTypes.appendList(multicatchTypes);
5242 }
5243 all_multicatchTypes.append(ctype);
5244 }
5245 }
5246 Type t = check(tree, types.lub(multicatchTypes.toList()),
5247 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5248 if (t.hasTag(CLASS)) {
5249 List<Type> alternatives =
5250 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5251 t = new UnionClassType((ClassType) t, alternatives);
5252 }
5253 tree.type = result = t;
5254 }
5255
5256 public void visitTypeIntersection(JCTypeIntersection tree) {
5257 attribTypes(tree.bounds, env);
5258 tree.type = result = checkIntersection(tree, tree.bounds);
5259 }
5260
5261 public void visitTypeParameter(JCTypeParameter tree) {
5262 TypeVar typeVar = (TypeVar) tree.type;
5263
5264 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5265 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5266 }
5267
5268 if (!typeVar.getUpperBound().isErroneous()) {
5269 //fixup type-parameter bound computed in 'attribTypeVariables'
5270 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5271 }
5272 }
5273
5274 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5275 Set<Symbol> boundSet = new HashSet<>();
5276 if (bounds.nonEmpty()) {
5277 // accept class or interface or typevar as first bound.
5278 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5279 boundSet.add(types.erasure(bounds.head.type).tsym);
5280 if (bounds.head.type.isErroneous()) {
5281 return bounds.head.type;
5282 }
5283 else if (bounds.head.type.hasTag(TYPEVAR)) {
5284 // if first bound was a typevar, do not accept further bounds.
5285 if (bounds.tail.nonEmpty()) {
5286 log.error(bounds.tail.head.pos(),
5287 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5288 return bounds.head.type;
5289 }
5290 } else {
5291 // if first bound was a class or interface, accept only interfaces
5292 // as further bounds.
5293 for (JCExpression bound : bounds.tail) {
5294 bound.type = checkBase(bound.type, bound, env, false, true, false);
5295 if (bound.type.isErroneous()) {
5296 bounds = List.of(bound);
5297 }
5298 else if (bound.type.hasTag(CLASS)) {
5299 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5300 }
5301 }
5302 }
5303 }
5304
5305 if (bounds.length() == 0) {
5306 return syms.objectType;
5307 } else if (bounds.length() == 1) {
5308 return bounds.head.type;
5309 } else {
5310 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5311 // ... the variable's bound is a class type flagged COMPOUND
5312 // (see comment for TypeVar.bound).
5313 // In this case, generate a class tree that represents the
5314 // bound class, ...
5315 JCExpression extending;
5316 List<JCExpression> implementing;
5317 if (!bounds.head.type.isInterface()) {
5318 extending = bounds.head;
5319 implementing = bounds.tail;
5320 } else {
5321 extending = null;
5322 implementing = bounds;
5323 }
5324 JCClassDecl cd = make.at(tree).ClassDef(
5325 make.Modifiers(PUBLIC | ABSTRACT | (extending != null && TreeInfo.symbol(extending).isPrimitiveClass() ? PRIMITIVE_CLASS : 0)),
5326 names.empty, List.nil(),
5327 extending, implementing, List.nil());
5328
5329 ClassSymbol c = (ClassSymbol)owntype.tsym;
5330 Assert.check((c.flags() & COMPOUND) != 0);
5331 cd.sym = c;
5332 c.sourcefile = env.toplevel.sourcefile;
5333
5334 // ... and attribute the bound class
5335 c.flags_field |= UNATTRIBUTED;
5336 Env<AttrContext> cenv = enter.classEnv(cd, env);
5337 typeEnvs.put(c, cenv);
5338 attribClass(c);
5339 return owntype;
5340 }
5341 }
5342
5343 public void visitWildcard(JCWildcard tree) {
5344 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5345 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5346 ? syms.objectType
5347 : attribType(tree.inner, env);
5348 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type, false),
5349 tree.kind.kind,
5350 syms.boundClass),
5351 KindSelector.TYP, resultInfo);
5352 }
5353
5354 public void visitAnnotation(JCAnnotation tree) {
5355 Assert.error("should be handled in annotate");
5356 }
5357
5358 @Override
5359 public void visitModifiers(JCModifiers tree) {
5360 //error recovery only:
5361 Assert.check(resultInfo.pkind == KindSelector.ERR);
5362
5363 attribAnnotationTypes(tree.annotations, env);
5364 }
5365
5366 public void visitAnnotatedType(JCAnnotatedType tree) {
5367 attribAnnotationTypes(tree.annotations, env);
5368 Type underlyingType = attribType(tree.underlyingType, env);
5369 Type annotatedType = underlyingType.preannotatedType();
5370
5371 if (!env.info.isNewClass)
5372 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5373 result = tree.type = annotatedType;
5374 }
5375
5376 public void visitErroneous(JCErroneous tree) {
5377 if (tree.errs != null) {
5378 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup());
5379 errEnv.info.returnResult = unknownExprInfo;
5380 for (JCTree err : tree.errs)
5381 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5382 }
5383 result = tree.type = syms.errType;
5384 }
5385
5386 /** Default visitor method for all other trees.
5387 */
5388 public void visitTree(JCTree tree) {
5389 throw new AssertionError();
5390 }
5391
5392 /**
5393 * Attribute an env for either a top level tree or class or module declaration.
5394 */
5395 public void attrib(Env<AttrContext> env) {
5396 switch (env.tree.getTag()) {
5397 case MODULEDEF:
5398 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5399 break;
5400 case PACKAGEDEF:
5401 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5402 break;
5403 default:
5404 attribClass(env.tree.pos(), env.enclClass.sym);
5405 }
5406 }
5407
5408 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5409 try {
5410 annotate.flush();
5411 attribPackage(p);
5412 } catch (CompletionFailure ex) {
5413 chk.completionError(pos, ex);
5414 }
5415 }
5416
5417 void attribPackage(PackageSymbol p) {
5418 attribWithLint(p,
5419 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5420 }
5421
5422 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5423 try {
5424 annotate.flush();
5425 attribModule(m);
5426 } catch (CompletionFailure ex) {
5427 chk.completionError(pos, ex);
5428 }
5429 }
5430
5431 void attribModule(ModuleSymbol m) {
5432 attribWithLint(m, env -> attribStat(env.tree, env));
5433 }
5434
5435 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5436 Env<AttrContext> env = typeEnvs.get(sym);
5437
5438 Env<AttrContext> lintEnv = env;
5439 while (lintEnv.info.lint == null)
5440 lintEnv = lintEnv.next;
5441
5442 Lint lint = lintEnv.info.lint.augment(sym);
5443
5444 Lint prevLint = chk.setLint(lint);
5445 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5446
5447 try {
5448 deferredLintHandler.flush(env.tree.pos());
5449 attrib.accept(env);
5450 } finally {
5451 log.useSource(prev);
5452 chk.setLint(prevLint);
5453 }
5454 }
5455
5456 /** Main method: attribute class definition associated with given class symbol.
5457 * reporting completion failures at the given position.
5458 * @param pos The source position at which completion errors are to be
5459 * reported.
5460 * @param c The class symbol whose definition will be attributed.
5461 */
5462 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5463 try {
5464 annotate.flush();
5465 attribClass(c);
5466 if (allowPrimitiveClasses && c.type.isPrimitiveClass()) {
5467 final Env<AttrContext> env = typeEnvs.get(c);
5468 if (env != null && env.tree != null && env.tree.hasTag(CLASSDEF))
5469 chk.checkNonCyclicMembership((JCClassDecl)env.tree);
5470 }
5471 } catch (CompletionFailure ex) {
5472 chk.completionError(pos, ex);
5473 }
5474 }
5475
5476 /** Attribute class definition associated with given class symbol.
5477 * @param c The class symbol whose definition will be attributed.
5478 */
5479 void attribClass(ClassSymbol c) throws CompletionFailure {
5480 if (c.type.hasTag(ERROR)) return;
5481
5482 // Check for cycles in the inheritance graph, which can arise from
5483 // ill-formed class files.
5484 chk.checkNonCyclic(null, c.type);
5485
5486 Type st = types.supertype(c.type);
5487 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5488 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5489 // First, attribute superclass.
5490 if (st.hasTag(CLASS))
5491 attribClass((ClassSymbol)st.tsym);
5492
5493 // Next attribute owner, if it is a class.
5494 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5495 attribClass((ClassSymbol)c.owner);
5496
5497 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5498 }
5499
5500 // The previous operations might have attributed the current class
5501 // if there was a cycle. So we test first whether the class is still
5502 // UNATTRIBUTED.
5503 if ((c.flags_field & UNATTRIBUTED) != 0) {
5504 c.flags_field &= ~UNATTRIBUTED;
5505
5506 // Get environment current at the point of class definition.
5507 Env<AttrContext> env = typeEnvs.get(c);
5508
5509 if (c.isSealed() &&
5510 !c.isEnum() &&
5511 !c.isPermittedExplicit &&
5512 c.permitted.isEmpty()) {
5513 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5514 }
5515
5516 if (c.isSealed()) {
5517 Set<Symbol> permittedTypes = new HashSet<>();
5518 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5519 for (Symbol subTypeSym : c.permitted) {
5520 boolean isTypeVar = false;
5521 if (subTypeSym.type.getTag() == TYPEVAR) {
5522 isTypeVar = true; //error recovery
5523 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5524 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5525 }
5526 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5527 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5528 }
5529 if (permittedTypes.contains(subTypeSym)) {
5530 DiagnosticPosition pos =
5531 env.enclClass.permitting.stream()
5532 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5533 .limit(2).collect(List.collector()).get(1);
5534 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5535 } else {
5536 permittedTypes.add(subTypeSym);
5537 }
5538 if (sealedInUnnamed) {
5539 if (subTypeSym.packge() != c.packge()) {
5540 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5541 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5542 );
5543 }
5544 } else if (subTypeSym.packge().modle != c.packge().modle) {
5545 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5546 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5547 );
5548 }
5549 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5550 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5551 Errors.InvalidPermitsClause(
5552 subTypeSym == c.type.tsym ?
5553 Fragments.MustNotBeSameClass :
5554 Fragments.MustNotBeSupertype(subTypeSym.type)
5555 )
5556 );
5557 } else if (!isTypeVar) {
5558 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5559 .stream()
5560 .anyMatch(d -> d.tsym == c);
5561 if (!thisIsASuper) {
5562 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5563 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5564 }
5565 }
5566 }
5567 }
5568
5569 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5570 .stream()
5571 .filter(s -> s.tsym.isSealed())
5572 .map(s -> (ClassSymbol) s.tsym)
5573 .collect(List.collector());
5574
5575 if (sealedSupers.isEmpty()) {
5576 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5577 boolean hasErrorSuper = false;
5578
5579 hasErrorSuper |= types.directSupertypes(c.type)
5580 .stream()
5581 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5582
5583 ClassType ct = (ClassType) c.type;
5584
5585 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5586
5587 if (!hasErrorSuper) {
5588 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5589 }
5590 }
5591 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5592 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5593 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5594 }
5595
5596 if (!c.type.isCompound()) {
5597 for (ClassSymbol supertypeSym : sealedSupers) {
5598 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5599 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5600 }
5601 }
5602 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5603 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5604 c.isInterface() ?
5605 Errors.NonSealedOrSealedExpected :
5606 Errors.NonSealedSealedOrFinalExpected);
5607 }
5608 }
5609 }
5610
5611 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5612 // because the annotations were not available at the time the env was created. Therefore,
5613 // we look up the environment chain for the first enclosing environment for which the
5614 // lint value is set. Typically, this is the parent env, but might be further if there
5615 // are any envs created as a result of TypeParameter nodes.
5616 Env<AttrContext> lintEnv = env;
5617 while (lintEnv.info.lint == null)
5618 lintEnv = lintEnv.next;
5619
5620 // Having found the enclosing lint value, we can initialize the lint value for this class
5621 env.info.lint = lintEnv.info.lint.augment(c);
5622
5623 Lint prevLint = chk.setLint(env.info.lint);
5624 JavaFileObject prev = log.useSource(c.sourcefile);
5625 ResultInfo prevReturnRes = env.info.returnResult;
5626
5627 try {
5628 deferredLintHandler.flush(env.tree);
5629 env.info.returnResult = null;
5630 // java.lang.Enum may not be subclassed by a non-enum
5631 if (st.tsym == syms.enumSym &&
5632 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5633 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5634
5635 // Enums may not be extended by source-level classes
5636 if (st.tsym != null &&
5637 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5638 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5639 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5640 }
5641
5642 if (rs.isSerializable(c.type)) {
5643 env.info.isSerializable = true;
5644 }
5645
5646 if (c.isValueClass()) {
5647 Assert.check(env.tree.hasTag(CLASSDEF));
5648 chk.checkConstraintsOfValueClass(env.tree.pos(), c);
5649 }
5650
5651 attribClassBody(env, c);
5652
5653 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5654 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5655 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5656 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5657
5658 if ((c.flags_field & Flags.UNNAMED_CLASS) != 0) {
5659 chk.checkHasMain(env.tree.pos(), c);
5660 }
5661 } finally {
5662 env.info.returnResult = prevReturnRes;
5663 log.useSource(prev);
5664 chk.setLint(prevLint);
5665 }
5666
5667 }
5668 }
5669
5670 public void visitImport(JCImport tree) {
5671 // nothing to do
5672 }
5673
5674 public void visitModuleDef(JCModuleDecl tree) {
5675 tree.sym.completeUsesProvides();
5676 ModuleSymbol msym = tree.sym;
5677 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5678 Lint prevLint = chk.setLint(lint);
5679 chk.checkModuleName(tree);
5680 chk.checkDeprecatedAnnotation(tree, msym);
5681
5682 try {
5683 deferredLintHandler.flush(tree.pos());
5684 } finally {
5685 chk.setLint(prevLint);
5686 }
5687 }
5688
5689 /** Finish the attribution of a class. */
5690 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5691 JCClassDecl tree = (JCClassDecl)env.tree;
5692 Assert.check(c == tree.sym);
5693
5694 // Validate type parameters, supertype and interfaces.
5695 attribStats(tree.typarams, env);
5696 if (!c.isAnonymous()) {
5697 //already checked if anonymous
5698 chk.validate(tree.typarams, env);
5699 chk.validate(tree.extending, env);
5700 chk.validate(tree.implementing, env);
5701 }
5702
5703 c.markAbstractIfNeeded(types);
5704
5705 // If this is a non-abstract class, check that it has no abstract
5706 // methods or unimplemented methods of an implemented interface.
5707 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5708 chk.checkAllDefined(tree.pos(), c);
5709 }
5710
5711 if ((c.flags() & ANNOTATION) != 0) {
5712 if (tree.implementing.nonEmpty())
5713 log.error(tree.implementing.head.pos(),
5714 Errors.CantExtendIntfAnnotation);
5715 if (tree.typarams.nonEmpty()) {
5716 log.error(tree.typarams.head.pos(),
5717 Errors.IntfAnnotationCantHaveTypeParams(c));
5718 }
5719
5720 // If this annotation type has a @Repeatable, validate
5721 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5722 // If this annotation type has a @Repeatable, validate
5723 if (repeatable != null) {
5724 // get diagnostic position for error reporting
5725 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5726 Assert.checkNonNull(cbPos);
5727
5728 chk.validateRepeatable(c, repeatable, cbPos);
5729 }
5730 } else {
5731 // Check that all extended classes and interfaces
5732 // are compatible (i.e. no two define methods with same arguments
5733 // yet different return types). (JLS 8.4.8.3)
5734 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5735 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5736 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5737 }
5738
5739 // Check that class does not import the same parameterized interface
5740 // with two different argument lists.
5741 chk.checkClassBounds(tree.pos(), c.type);
5742
5743 tree.type = c.type;
5744
5745 for (List<JCTypeParameter> l = tree.typarams;
5746 l.nonEmpty(); l = l.tail) {
5747 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5748 }
5749
5750 // Check that a generic class doesn't extend Throwable
5751 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5752 log.error(tree.extending.pos(), Errors.GenericThrowable);
5753
5754 // Check that all methods which implement some
5755 // method conform to the method they implement.
5756 chk.checkImplementations(tree);
5757
5758 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5759 checkAutoCloseable(tree.pos(), env, c.type);
5760
5761 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5762 // Attribute declaration
5763 attribStat(l.head, env);
5764 // Check that declarations in inner classes are not static (JLS 8.1.2)
5765 // Make an exception for static constants.
5766 if (!allowRecords &&
5767 c.owner.kind != PCK &&
5768 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5769 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5770 VarSymbol sym = null;
5771 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5772 if (sym == null ||
5773 sym.kind != VAR ||
5774 sym.getConstValue() == null)
5775 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5776 }
5777 }
5778
5779 // Check for cycles among non-initial constructors.
5780 chk.checkCyclicConstructors(tree);
5781
5782 // Check for cycles among annotation elements.
5783 chk.checkNonCyclicElements(tree);
5784
5785 // Check for proper use of serialVersionUID and other
5786 // serialization-related fields and methods
5787 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5788 && rs.isSerializable(c.type)
5789 && !c.isAnonymous()) {
5790 chk.checkSerialStructure(tree, c);
5791 }
5792 // Correctly organize the positions of the type annotations
5793 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5794
5795 // Check type annotations applicability rules
5796 validateTypeAnnotations(tree, false);
5797 }
5798 // where
5799 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5800 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5801 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5802 if (types.isSameType(al.head.annotationType.type, t))
5803 return al.head.pos();
5804 }
5805
5806 return null;
5807 }
5808
5809 private Type capture(Type type) {
5810 return types.capture(type);
5811 }
5812
5813 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5814 if (type.isErroneous()) {
5815 tree.vartype = make.at(Position.NOPOS).Erroneous();
5816 } else {
5817 tree.vartype = make.at(Position.NOPOS).Type(type);
5818 }
5819 }
5820
5821 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5822 tree.accept(new TypeAnnotationsValidator(sigOnly));
5823 }
5824 //where
5825 private final class TypeAnnotationsValidator extends TreeScanner {
5826
5827 private final boolean sigOnly;
5828 public TypeAnnotationsValidator(boolean sigOnly) {
5829 this.sigOnly = sigOnly;
5830 }
5831
5832 public void visitAnnotation(JCAnnotation tree) {
5833 chk.validateTypeAnnotation(tree, null, false);
5834 super.visitAnnotation(tree);
5835 }
5836 public void visitAnnotatedType(JCAnnotatedType tree) {
5837 if (!tree.underlyingType.type.isErroneous()) {
5838 super.visitAnnotatedType(tree);
5839 }
5840 }
5841 public void visitTypeParameter(JCTypeParameter tree) {
5842 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5843 scan(tree.bounds);
5844 // Don't call super.
5845 // This is needed because above we call validateTypeAnnotation with
5846 // false, which would forbid annotations on type parameters.
5847 // super.visitTypeParameter(tree);
5848 }
5849 public void visitMethodDef(JCMethodDecl tree) {
5850 if (tree.recvparam != null &&
5851 !tree.recvparam.vartype.type.isErroneous()) {
5852 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5853 }
5854 if (tree.restype != null && tree.restype.type != null) {
5855 validateAnnotatedType(tree.restype, tree.restype.type);
5856 }
5857 if (sigOnly) {
5858 scan(tree.mods);
5859 scan(tree.restype);
5860 scan(tree.typarams);
5861 scan(tree.recvparam);
5862 scan(tree.params);
5863 scan(tree.thrown);
5864 } else {
5865 scan(tree.defaultValue);
5866 scan(tree.body);
5867 }
5868 }
5869 public void visitVarDef(final JCVariableDecl tree) {
5870 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5871 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5872 validateAnnotatedType(tree.vartype, tree.sym.type);
5873 scan(tree.mods);
5874 scan(tree.vartype);
5875 if (!sigOnly) {
5876 scan(tree.init);
5877 }
5878 }
5879 public void visitTypeCast(JCTypeCast tree) {
5880 if (tree.clazz != null && tree.clazz.type != null)
5881 validateAnnotatedType(tree.clazz, tree.clazz.type);
5882 super.visitTypeCast(tree);
5883 }
5884 public void visitTypeTest(JCInstanceOf tree) {
5885 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5886 validateAnnotatedType(tree.pattern, tree.pattern.type);
5887 super.visitTypeTest(tree);
5888 }
5889 public void visitNewClass(JCNewClass tree) {
5890 if (tree.clazz != null && tree.clazz.type != null) {
5891 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5892 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5893 tree.clazz.type.tsym);
5894 }
5895 if (tree.def != null) {
5896 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5897 }
5898
5899 validateAnnotatedType(tree.clazz, tree.clazz.type);
5900 }
5901 super.visitNewClass(tree);
5902 }
5903 public void visitNewArray(JCNewArray tree) {
5904 if (tree.elemtype != null && tree.elemtype.type != null) {
5905 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5906 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5907 tree.elemtype.type.tsym);
5908 }
5909 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5910 }
5911 super.visitNewArray(tree);
5912 }
5913 public void visitClassDef(JCClassDecl tree) {
5914 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5915 if (sigOnly) {
5916 scan(tree.mods);
5917 scan(tree.typarams);
5918 scan(tree.extending);
5919 scan(tree.implementing);
5920 }
5921 for (JCTree member : tree.defs) {
5922 if (member.hasTag(Tag.CLASSDEF)) {
5923 continue;
5924 }
5925 scan(member);
5926 }
5927 }
5928 public void visitBlock(JCBlock tree) {
5929 if (!sigOnly) {
5930 scan(tree.stats);
5931 }
5932 }
5933
5934 /* I would want to model this after
5935 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5936 * and override visitSelect and visitTypeApply.
5937 * However, we only set the annotated type in the top-level type
5938 * of the symbol.
5939 * Therefore, we need to override each individual location where a type
5940 * can occur.
5941 */
5942 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5943 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5944
5945 if (type.isPrimitiveOrVoid()) {
5946 return;
5947 }
5948
5949 JCTree enclTr = errtree;
5950 Type enclTy = type;
5951
5952 boolean repeat = true;
5953 while (repeat) {
5954 if (enclTr.hasTag(TYPEAPPLY)) {
5955 List<Type> tyargs = enclTy.getTypeArguments();
5956 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5957 if (trargs.length() > 0) {
5958 // Nothing to do for diamonds
5959 if (tyargs.length() == trargs.length()) {
5960 for (int i = 0; i < tyargs.length(); ++i) {
5961 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5962 }
5963 }
5964 // If the lengths don't match, it's either a diamond
5965 // or some nested type that redundantly provides
5966 // type arguments in the tree.
5967 }
5968
5969 // Look at the clazz part of a generic type
5970 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5971 }
5972
5973 if (enclTr.hasTag(SELECT)) {
5974 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5975 if (enclTy != null &&
5976 !enclTy.hasTag(NONE)) {
5977 enclTy = enclTy.getEnclosingType();
5978 }
5979 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5980 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5981 if (enclTy == null || enclTy.hasTag(NONE)) {
5982 if (at.getAnnotations().size() == 1) {
5983 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5984 } else {
5985 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5986 for (JCAnnotation an : at.getAnnotations()) {
5987 comps.add(an.attribute);
5988 }
5989 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5990 }
5991 repeat = false;
5992 }
5993 enclTr = at.underlyingType;
5994 // enclTy doesn't need to be changed
5995 } else if (enclTr.hasTag(IDENT)) {
5996 repeat = false;
5997 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5998 JCWildcard wc = (JCWildcard) enclTr;
5999 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6000 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6001 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6002 } else {
6003 // Nothing to do for UNBOUND
6004 }
6005 repeat = false;
6006 } else if (enclTr.hasTag(TYPEARRAY)) {
6007 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6008 validateAnnotatedType(art.getType(), art.elemtype.type);
6009 repeat = false;
6010 } else if (enclTr.hasTag(TYPEUNION)) {
6011 JCTypeUnion ut = (JCTypeUnion) enclTr;
6012 for (JCTree t : ut.getTypeAlternatives()) {
6013 validateAnnotatedType(t, t.type);
6014 }
6015 repeat = false;
6016 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6017 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6018 for (JCTree t : it.getBounds()) {
6019 validateAnnotatedType(t, t.type);
6020 }
6021 repeat = false;
6022 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6023 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6024 repeat = false;
6025 } else {
6026 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6027 " within: "+ errtree + " with kind: " + errtree.getKind());
6028 }
6029 }
6030 }
6031
6032 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6033 Symbol sym) {
6034 // Ensure that no declaration annotations are present.
6035 // Note that a tree type might be an AnnotatedType with
6036 // empty annotations, if only declaration annotations were given.
6037 // This method will raise an error for such a type.
6038 for (JCAnnotation ai : annotations) {
6039 if (!ai.type.isErroneous() &&
6040 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6041 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6042 }
6043 }
6044 }
6045 }
6046
6047 // <editor-fold desc="post-attribution visitor">
6048
6049 /**
6050 * Handle missing types/symbols in an AST. This routine is useful when
6051 * the compiler has encountered some errors (which might have ended up
6052 * terminating attribution abruptly); if the compiler is used in fail-over
6053 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6054 * prevents NPE to be propagated during subsequent compilation steps.
6055 */
6056 public void postAttr(JCTree tree) {
6057 new PostAttrAnalyzer().scan(tree);
6058 }
6059
6060 class PostAttrAnalyzer extends TreeScanner {
6061
6062 private void initTypeIfNeeded(JCTree that) {
6063 if (that.type == null) {
6064 if (that.hasTag(METHODDEF)) {
6065 that.type = dummyMethodType((JCMethodDecl)that);
6066 } else {
6067 that.type = syms.unknownType;
6068 }
6069 }
6070 }
6071
6072 /* Construct a dummy method type. If we have a method declaration,
6073 * and the declared return type is void, then use that return type
6074 * instead of UNKNOWN to avoid spurious error messages in lambda
6075 * bodies (see:JDK-8041704).
6076 */
6077 private Type dummyMethodType(JCMethodDecl md) {
6078 Type restype = syms.unknownType;
6079 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6080 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6081 if (prim.typetag == VOID)
6082 restype = syms.voidType;
6083 }
6084 return new MethodType(List.nil(), restype,
6085 List.nil(), syms.methodClass);
6086 }
6087 private Type dummyMethodType() {
6088 return dummyMethodType(null);
6089 }
6090
6091 @Override
6092 public void scan(JCTree tree) {
6093 if (tree == null) return;
6094 if (tree instanceof JCExpression) {
6095 initTypeIfNeeded(tree);
6096 }
6097 super.scan(tree);
6098 }
6099
6100 @Override
6101 public void visitIdent(JCIdent that) {
6102 if (that.sym == null) {
6103 that.sym = syms.unknownSymbol;
6104 }
6105 }
6106
6107 @Override
6108 public void visitSelect(JCFieldAccess that) {
6109 if (that.sym == null) {
6110 that.sym = syms.unknownSymbol;
6111 }
6112 super.visitSelect(that);
6113 }
6114
6115 @Override
6116 public void visitClassDef(JCClassDecl that) {
6117 initTypeIfNeeded(that);
6118 if (that.sym == null) {
6119 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6120 }
6121 super.visitClassDef(that);
6122 }
6123
6124 @Override
6125 public void visitMethodDef(JCMethodDecl that) {
6126 initTypeIfNeeded(that);
6127 if (that.sym == null) {
6128 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6129 }
6130 super.visitMethodDef(that);
6131 }
6132
6133 @Override
6134 public void visitVarDef(JCVariableDecl that) {
6135 initTypeIfNeeded(that);
6136 if (that.sym == null) {
6137 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6138 that.sym.adr = 0;
6139 }
6140 if (that.vartype == null) {
6141 that.vartype = make.at(Position.NOPOS).Erroneous();
6142 }
6143 super.visitVarDef(that);
6144 }
6145
6146 @Override
6147 public void visitBindingPattern(JCBindingPattern that) {
6148 initTypeIfNeeded(that);
6149 initTypeIfNeeded(that.var);
6150 if (that.var.sym == null) {
6151 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6152 that.var.sym.adr = 0;
6153 }
6154 super.visitBindingPattern(that);
6155 }
6156
6157 @Override
6158 public void visitNewClass(JCNewClass that) {
6159 if (that.constructor == null) {
6160 that.constructor = new MethodSymbol(0, names.init,
6161 dummyMethodType(), syms.noSymbol);
6162 }
6163 if (that.constructorType == null) {
6164 that.constructorType = syms.unknownType;
6165 }
6166 super.visitNewClass(that);
6167 }
6168
6169 @Override
6170 public void visitAssignop(JCAssignOp that) {
6171 if (that.operator == null) {
6172 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6173 -1, syms.noSymbol);
6174 }
6175 super.visitAssignop(that);
6176 }
6177
6178 @Override
6179 public void visitBinary(JCBinary that) {
6180 if (that.operator == null) {
6181 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6182 -1, syms.noSymbol);
6183 }
6184 super.visitBinary(that);
6185 }
6186
6187 @Override
6188 public void visitUnary(JCUnary that) {
6189 if (that.operator == null) {
6190 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6191 -1, syms.noSymbol);
6192 }
6193 super.visitUnary(that);
6194 }
6195
6196 @Override
6197 public void visitReference(JCMemberReference that) {
6198 super.visitReference(that);
6199 if (that.sym == null) {
6200 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6201 syms.noSymbol);
6202 }
6203 }
6204 }
6205 // </editor-fold>
6206
6207 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6208 new TreeScanner() {
6209 Symbol packge = pkg;
6210 @Override
6211 public void visitIdent(JCIdent that) {
6212 that.sym = packge;
6213 }
6214
6215 @Override
6216 public void visitSelect(JCFieldAccess that) {
6217 that.sym = packge;
6218 packge = packge.owner;
6219 super.visitSelect(that);
6220 }
6221 }.scan(pid);
6222 }
6223
6224 }