1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31
32 import javax.lang.model.element.ElementKind;
33 import javax.tools.JavaFileObject;
34
35 import com.sun.source.tree.CaseTree;
36 import com.sun.source.tree.IdentifierTree;
37 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
38 import com.sun.source.tree.MemberSelectTree;
39 import com.sun.source.tree.TreeVisitor;
40 import com.sun.source.util.SimpleTreeVisitor;
41 import com.sun.tools.javac.code.*;
42 import com.sun.tools.javac.code.Lint.LintCategory;
43 import com.sun.tools.javac.code.Scope.WriteableScope;
44 import com.sun.tools.javac.code.Source.Feature;
45 import com.sun.tools.javac.code.Symbol.*;
46 import com.sun.tools.javac.code.Type.*;
47 import com.sun.tools.javac.code.TypeMetadata.Annotations;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
62 import com.sun.tools.javac.tree.*;
63 import com.sun.tools.javac.tree.JCTree.*;
64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
65 import com.sun.tools.javac.util.*;
66 import com.sun.tools.javac.util.DefinedBy.Api;
67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
68 import com.sun.tools.javac.util.JCDiagnostic.Error;
69 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
70 import com.sun.tools.javac.util.JCDiagnostic.Warning;
71 import com.sun.tools.javac.util.List;
72
73 import static com.sun.tools.javac.code.Flags.*;
74 import static com.sun.tools.javac.code.Flags.ANNOTATION;
75 import static com.sun.tools.javac.code.Flags.BLOCK;
76 import static com.sun.tools.javac.code.Kinds.*;
77 import static com.sun.tools.javac.code.Kinds.Kind.*;
78 import static com.sun.tools.javac.code.TypeTag.*;
79 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
80 import static com.sun.tools.javac.tree.JCTree.Tag.*;
81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
82
83 /** This is the main context-dependent analysis phase in GJC. It
84 * encompasses name resolution, type checking and constant folding as
85 * subtasks. Some subtasks involve auxiliary classes.
86 * @see Check
87 * @see Resolve
88 * @see ConstFold
89 * @see Infer
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public class Attr extends JCTree.Visitor {
97 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
98
99 final Names names;
100 final Log log;
101 final Symtab syms;
102 final Resolve rs;
103 final Operators operators;
104 final Infer infer;
105 final Analyzer analyzer;
106 final DeferredAttr deferredAttr;
107 final Check chk;
108 final Flow flow;
109 final MemberEnter memberEnter;
110 final TypeEnter typeEnter;
111 final TreeMaker make;
112 final ConstFold cfolder;
113 final Enter enter;
114 final Target target;
115 final Types types;
116 final Preview preview;
117 final JCDiagnostic.Factory diags;
118 final TypeAnnotations typeAnnotations;
119 final DeferredLintHandler deferredLintHandler;
120 final TypeEnvs typeEnvs;
121 final Dependencies dependencies;
122 final Annotate annotate;
123 final ArgumentAttr argumentAttr;
124 final MatchBindingsComputer matchBindingsComputer;
125 final AttrRecover attrRecover;
126
127 public static Attr instance(Context context) {
128 Attr instance = context.get(attrKey);
129 if (instance == null)
130 instance = new Attr(context);
131 return instance;
132 }
133
134 protected Attr(Context context) {
135 context.put(attrKey, this);
136
137 names = Names.instance(context);
138 log = Log.instance(context);
139 syms = Symtab.instance(context);
140 rs = Resolve.instance(context);
141 operators = Operators.instance(context);
142 chk = Check.instance(context);
143 flow = Flow.instance(context);
144 memberEnter = MemberEnter.instance(context);
145 typeEnter = TypeEnter.instance(context);
146 make = TreeMaker.instance(context);
147 enter = Enter.instance(context);
148 infer = Infer.instance(context);
149 analyzer = Analyzer.instance(context);
150 deferredAttr = DeferredAttr.instance(context);
151 cfolder = ConstFold.instance(context);
152 target = Target.instance(context);
153 types = Types.instance(context);
154 preview = Preview.instance(context);
155 diags = JCDiagnostic.Factory.instance(context);
156 annotate = Annotate.instance(context);
157 typeAnnotations = TypeAnnotations.instance(context);
158 deferredLintHandler = DeferredLintHandler.instance(context);
159 typeEnvs = TypeEnvs.instance(context);
160 dependencies = Dependencies.instance(context);
161 argumentAttr = ArgumentAttr.instance(context);
162 matchBindingsComputer = MatchBindingsComputer.instance(context);
163 attrRecover = AttrRecover.instance(context);
164
165 Options options = Options.instance(context);
166
167 Source source = Source.instance(context);
168 allowPoly = Feature.POLY.allowedInSource(source);
169 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
170 allowLambda = Feature.LAMBDA.allowedInSource(source);
171 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
172 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
173 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
174 allowRecords = Feature.RECORDS.allowedInSource(source);
175 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
176 Feature.PATTERN_SWITCH.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: support target-typing inference
190 */
191 boolean allowPoly;
192
193 /** Switch: support type annotations.
194 */
195 boolean allowTypeAnnos;
196
197 /** Switch: support lambda expressions ?
198 */
199 boolean allowLambda;
200
201 /** Switch: support default methods ?
202 */
203 boolean allowDefaultMethods;
204
205 /** Switch: static interface methods enabled?
206 */
207 boolean allowStaticInterfaceMethods;
208
209 /** Switch: reifiable types in instanceof enabled?
210 */
211 boolean allowReifiableTypesInInstanceof;
212
213 /** Are records allowed
214 */
215 private final boolean allowRecords;
216
217 /** Are patterns in switch allowed
218 */
219 private final boolean allowPatternSwitch;
220
221 /**
222 * Switch: warn about use of variable before declaration?
223 * RFE: 6425594
224 */
225 boolean useBeforeDeclarationWarning;
226
227 /**
228 * Switch: name of source level; used for error reporting.
229 */
230 String sourceName;
231
232 /** Check kind and type of given tree against protokind and prototype.
233 * If check succeeds, store type in tree and return it.
234 * If check fails, store errType in tree and return it.
235 * No checks are performed if the prototype is a method type.
236 * It is not necessary in this case since we know that kind and type
237 * are correct.
238 *
239 * @param tree The tree whose kind and type is checked
240 * @param found The computed type of the tree
241 * @param ownkind The computed kind of the tree
242 * @param resultInfo The expected result of the tree
243 */
244 Type check(final JCTree tree,
245 final Type found,
246 final KindSelector ownkind,
247 final ResultInfo resultInfo) {
248 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
249 Type owntype;
250 boolean shouldCheck = !found.hasTag(ERROR) &&
251 !resultInfo.pt.hasTag(METHOD) &&
252 !resultInfo.pt.hasTag(FORALL);
253 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
254 log.error(tree.pos(),
255 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
256 ownkind.kindNames()));
257 owntype = types.createErrorType(found);
258 } else if (allowPoly && inferenceContext.free(found)) {
259 //delay the check if there are inference variables in the found type
260 //this means we are dealing with a partially inferred poly expression
261 owntype = shouldCheck ? resultInfo.pt : found;
262 if (resultInfo.checkMode.installPostInferenceHook()) {
263 inferenceContext.addFreeTypeListener(List.of(found),
264 instantiatedContext -> {
265 ResultInfo pendingResult =
266 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
267 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
268 });
269 }
270 } else {
271 owntype = shouldCheck ?
272 resultInfo.check(tree, found) :
273 found;
274 }
275 if (resultInfo.checkMode.updateTreeType()) {
276 tree.type = owntype;
277 }
278 return owntype;
279 }
280
281 /** Is given blank final variable assignable, i.e. in a scope where it
282 * may be assigned to even though it is final?
283 * @param v The blank final variable.
284 * @param env The current environment.
285 */
286 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
287 Symbol owner = env.info.scope.owner;
288 // owner refers to the innermost variable, method or
289 // initializer block declaration at this point.
290 boolean isAssignable =
291 v.owner == owner
292 ||
293 ((owner.name == names.init || // i.e. we are in a constructor
294 owner.kind == VAR || // i.e. we are in a variable initializer
295 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
296 &&
297 v.owner == owner.owner
298 &&
299 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
300 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
301 return isAssignable & !insideCompactConstructor;
302 }
303
304 /** Check that variable can be assigned to.
305 * @param pos The current source code position.
306 * @param v The assigned variable
307 * @param base If the variable is referred to in a Select, the part
308 * to the left of the `.', null otherwise.
309 * @param env The current environment.
310 */
311 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
312 if (v.name == names._this) {
313 log.error(pos, Errors.CantAssignValToThis);
314 } else if ((v.flags() & FINAL) != 0 &&
315 ((v.flags() & HASINIT) != 0
316 ||
317 !((base == null ||
318 TreeInfo.isThisQualifier(base)) &&
319 isAssignableAsBlankFinal(v, env)))) {
320 if (v.isResourceVariable()) { //TWR resource
321 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
322 } else {
323 log.error(pos, Errors.CantAssignValToFinalVar(v));
324 }
325 }
326 }
327
328 /** Does tree represent a static reference to an identifier?
329 * It is assumed that tree is either a SELECT or an IDENT.
330 * We have to weed out selects from non-type names here.
331 * @param tree The candidate tree.
332 */
333 boolean isStaticReference(JCTree tree) {
334 if (tree.hasTag(SELECT)) {
335 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
336 if (lsym == null || lsym.kind != TYP) {
337 return false;
338 }
339 }
340 return true;
341 }
342
343 /** Is this symbol a type?
344 */
345 static boolean isType(Symbol sym) {
346 return sym != null && sym.kind == TYP;
347 }
348
349 /** The current `this' symbol.
350 * @param env The current environment.
351 */
352 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
353 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
354 }
355
356 /** Attribute a parsed identifier.
357 * @param tree Parsed identifier name
358 * @param topLevel The toplevel to use
359 */
360 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
361 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
362 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
363 syms.errSymbol.name,
364 null, null, null, null);
365 localEnv.enclClass.sym = syms.errSymbol;
366 return attribIdent(tree, localEnv);
367 }
368
369 /** Attribute a parsed identifier.
370 * @param tree Parsed identifier name
371 * @param env The env to use
372 */
373 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
374 return tree.accept(identAttributer, env);
375 }
376 // where
377 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
378 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
379 @Override @DefinedBy(Api.COMPILER_TREE)
380 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
381 Symbol site = visit(node.getExpression(), env);
382 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
383 return site;
384 Name name = (Name)node.getIdentifier();
385 if (site.kind == PCK) {
386 env.toplevel.packge = (PackageSymbol)site;
387 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
388 KindSelector.TYP_PCK);
389 } else {
390 env.enclClass.sym = (ClassSymbol)site;
391 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
392 }
393 }
394
395 @Override @DefinedBy(Api.COMPILER_TREE)
396 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
397 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
398 }
399 }
400
401 public Type coerce(Type etype, Type ttype) {
402 return cfolder.coerce(etype, ttype);
403 }
404
405 public Type attribType(JCTree node, TypeSymbol sym) {
406 Env<AttrContext> env = typeEnvs.get(sym);
407 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
408 return attribTree(node, localEnv, unknownTypeInfo);
409 }
410
411 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
412 // Attribute qualifying package or class.
413 JCFieldAccess s = (JCFieldAccess)tree.qualid;
414 return attribTree(s.selected, env,
415 new ResultInfo(tree.staticImport ?
416 KindSelector.TYP : KindSelector.TYP_PCK,
417 Type.noType));
418 }
419
420 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
421 return attribToTree(expr, env, tree, unknownExprInfo);
422 }
423
424 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
425 return attribToTree(stmt, env, tree, statInfo);
426 }
427
428 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
429 breakTree = tree;
430 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
431 try {
432 deferredAttr.attribSpeculative(root, env, resultInfo,
433 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
434 argumentAttr.withLocalCacheContext());
435 attrRecover.doRecovery();
436 } catch (BreakAttr b) {
437 return b.env;
438 } catch (AssertionError ae) {
439 if (ae.getCause() instanceof BreakAttr breakAttr) {
440 return breakAttr.env;
441 } else {
442 throw ae;
443 }
444 } finally {
445 breakTree = null;
446 log.useSource(prev);
447 }
448 return env;
449 }
450
451 private JCTree breakTree = null;
452
453 private static class BreakAttr extends RuntimeException {
454 static final long serialVersionUID = -6924771130405446405L;
455 private transient Env<AttrContext> env;
456 private BreakAttr(Env<AttrContext> env) {
457 this.env = env;
458 }
459 }
460
461 /**
462 * Mode controlling behavior of Attr.Check
463 */
464 enum CheckMode {
465
466 NORMAL,
467
468 /**
469 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
470 * that the captured var cache in {@code InferenceContext} will be used in read-only
471 * mode when performing inference checks.
472 */
473 NO_TREE_UPDATE {
474 @Override
475 public boolean updateTreeType() {
476 return false;
477 }
478 },
479 /**
480 * Mode signalling that caller will manage free types in tree decorations.
481 */
482 NO_INFERENCE_HOOK {
483 @Override
484 public boolean installPostInferenceHook() {
485 return false;
486 }
487 };
488
489 public boolean updateTreeType() {
490 return true;
491 }
492 public boolean installPostInferenceHook() {
493 return true;
494 }
495 }
496
497
498 class ResultInfo {
499 final KindSelector pkind;
500 final Type pt;
501 final CheckContext checkContext;
502 final CheckMode checkMode;
503
504 ResultInfo(KindSelector pkind, Type pt) {
505 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
506 }
507
508 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
509 this(pkind, pt, chk.basicHandler, checkMode);
510 }
511
512 protected ResultInfo(KindSelector pkind,
513 Type pt, CheckContext checkContext) {
514 this(pkind, pt, checkContext, CheckMode.NORMAL);
515 }
516
517 protected ResultInfo(KindSelector pkind,
518 Type pt, CheckContext checkContext, CheckMode checkMode) {
519 this.pkind = pkind;
520 this.pt = pt;
521 this.checkContext = checkContext;
522 this.checkMode = checkMode;
523 }
524
525 /**
526 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
527 * @param tree The tree to be type-checked.
528 * @return true if {@ArgumentAttr} should be used.
529 */
530 protected boolean needsArgumentAttr(JCTree tree) { return false; }
531
532 protected Type check(final DiagnosticPosition pos, final Type found) {
533 return chk.checkType(pos, found, pt, checkContext);
534 }
535
536 protected ResultInfo dup(Type newPt) {
537 return new ResultInfo(pkind, newPt, checkContext, checkMode);
538 }
539
540 protected ResultInfo dup(CheckContext newContext) {
541 return new ResultInfo(pkind, pt, newContext, checkMode);
542 }
543
544 protected ResultInfo dup(Type newPt, CheckContext newContext) {
545 return new ResultInfo(pkind, newPt, newContext, checkMode);
546 }
547
548 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
549 return new ResultInfo(pkind, newPt, newContext, newMode);
550 }
551
552 protected ResultInfo dup(CheckMode newMode) {
553 return new ResultInfo(pkind, pt, checkContext, newMode);
554 }
555
556 @Override
557 public String toString() {
558 if (pt != null) {
559 return pt.toString();
560 } else {
561 return "";
562 }
563 }
564 }
565
566 class MethodAttrInfo extends ResultInfo {
567 public MethodAttrInfo() {
568 this(chk.basicHandler);
569 }
570
571 public MethodAttrInfo(CheckContext checkContext) {
572 super(KindSelector.VAL, Infer.anyPoly, checkContext);
573 }
574
575 @Override
576 protected boolean needsArgumentAttr(JCTree tree) {
577 return true;
578 }
579
580 protected ResultInfo dup(Type newPt) {
581 throw new IllegalStateException();
582 }
583
584 protected ResultInfo dup(CheckContext newContext) {
585 return new MethodAttrInfo(newContext);
586 }
587
588 protected ResultInfo dup(Type newPt, CheckContext newContext) {
589 throw new IllegalStateException();
590 }
591
592 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
593 throw new IllegalStateException();
594 }
595
596 protected ResultInfo dup(CheckMode newMode) {
597 throw new IllegalStateException();
598 }
599 }
600
601 class RecoveryInfo extends ResultInfo {
602
603 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
604 this(deferredAttrContext, Type.recoveryType);
605 }
606
607 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
608 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
609 @Override
610 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
611 return deferredAttrContext;
612 }
613 @Override
614 public boolean compatible(Type found, Type req, Warner warn) {
615 return true;
616 }
617 @Override
618 public void report(DiagnosticPosition pos, JCDiagnostic details) {
619 boolean needsReport = pt == Type.recoveryType ||
620 (details.getDiagnosticPosition() != null &&
621 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
622 if (needsReport) {
623 chk.basicHandler.report(pos, details);
624 }
625 }
626 });
627 }
628 }
629
630 final ResultInfo statInfo;
631 final ResultInfo varAssignmentInfo;
632 final ResultInfo methodAttrInfo;
633 final ResultInfo unknownExprInfo;
634 final ResultInfo unknownTypeInfo;
635 final ResultInfo unknownTypeExprInfo;
636 final ResultInfo recoveryInfo;
637
638 Type pt() {
639 return resultInfo.pt;
640 }
641
642 KindSelector pkind() {
643 return resultInfo.pkind;
644 }
645
646 /* ************************************************************************
647 * Visitor methods
648 *************************************************************************/
649
650 /** Visitor argument: the current environment.
651 */
652 Env<AttrContext> env;
653
654 /** Visitor argument: the currently expected attribution result.
655 */
656 ResultInfo resultInfo;
657
658 /** Visitor result: the computed type.
659 */
660 Type result;
661
662 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
663
664 /** Visitor method: attribute a tree, catching any completion failure
665 * exceptions. Return the tree's type.
666 *
667 * @param tree The tree to be visited.
668 * @param env The environment visitor argument.
669 * @param resultInfo The result info visitor argument.
670 */
671 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
672 Env<AttrContext> prevEnv = this.env;
673 ResultInfo prevResult = this.resultInfo;
674 try {
675 this.env = env;
676 this.resultInfo = resultInfo;
677 if (resultInfo.needsArgumentAttr(tree)) {
678 result = argumentAttr.attribArg(tree, env);
679 } else {
680 tree.accept(this);
681 }
682 matchBindings = matchBindingsComputer.finishBindings(tree,
683 matchBindings);
684 if (tree == breakTree &&
685 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
686 breakTreeFound(copyEnv(env));
687 }
688 return result;
689 } catch (CompletionFailure ex) {
690 tree.type = syms.errType;
691 return chk.completionError(tree.pos(), ex);
692 } finally {
693 this.env = prevEnv;
694 this.resultInfo = prevResult;
695 }
696 }
697
698 protected void breakTreeFound(Env<AttrContext> env) {
699 throw new BreakAttr(env);
700 }
701
702 Env<AttrContext> copyEnv(Env<AttrContext> env) {
703 Env<AttrContext> newEnv =
704 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
705 if (newEnv.outer != null) {
706 newEnv.outer = copyEnv(newEnv.outer);
707 }
708 return newEnv;
709 }
710
711 WriteableScope copyScope(WriteableScope sc) {
712 WriteableScope newScope = WriteableScope.create(sc.owner);
713 List<Symbol> elemsList = List.nil();
714 for (Symbol sym : sc.getSymbols()) {
715 elemsList = elemsList.prepend(sym);
716 }
717 for (Symbol s : elemsList) {
718 newScope.enter(s);
719 }
720 return newScope;
721 }
722
723 /** Derived visitor method: attribute an expression tree.
724 */
725 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
726 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
727 }
728
729 /** Derived visitor method: attribute an expression tree with
730 * no constraints on the computed type.
731 */
732 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
733 return attribTree(tree, env, unknownExprInfo);
734 }
735
736 /** Derived visitor method: attribute a type tree.
737 */
738 public Type attribType(JCTree tree, Env<AttrContext> env) {
739 Type result = attribType(tree, env, Type.noType);
740 return result;
741 }
742
743 /** Derived visitor method: attribute a type tree.
744 */
745 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
746 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
747 return result;
748 }
749
750 /** Derived visitor method: attribute a statement or definition tree.
751 */
752 public Type attribStat(JCTree tree, Env<AttrContext> env) {
753 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
754 Type result = attribTree(tree, env, statInfo);
755 analyzer.analyzeIfNeeded(tree, analyzeEnv);
756 attrRecover.doRecovery();
757 return result;
758 }
759
760 /** Attribute a list of expressions, returning a list of types.
761 */
762 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
763 ListBuffer<Type> ts = new ListBuffer<>();
764 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
765 ts.append(attribExpr(l.head, env, pt));
766 return ts.toList();
767 }
768
769 /** Attribute a list of statements, returning nothing.
770 */
771 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
772 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
773 attribStat(l.head, env);
774 }
775
776 /** Attribute the arguments in a method call, returning the method kind.
777 */
778 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
779 KindSelector kind = initialKind;
780 for (JCExpression arg : trees) {
781 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
782 if (argtype.hasTag(DEFERRED)) {
783 kind = KindSelector.of(KindSelector.POLY, kind);
784 }
785 argtypes.append(argtype);
786 }
787 return kind;
788 }
789
790 /** Attribute a type argument list, returning a list of types.
791 * Caller is responsible for calling checkRefTypes.
792 */
793 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
794 ListBuffer<Type> argtypes = new ListBuffer<>();
795 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
796 argtypes.append(attribType(l.head, env));
797 return argtypes.toList();
798 }
799
800 /** Attribute a type argument list, returning a list of types.
801 * Check that all the types are references.
802 */
803 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
804 List<Type> types = attribAnyTypes(trees, env);
805 return chk.checkRefTypes(trees, types);
806 }
807
808 /**
809 * Attribute type variables (of generic classes or methods).
810 * Compound types are attributed later in attribBounds.
811 * @param typarams the type variables to enter
812 * @param env the current environment
813 */
814 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
815 for (JCTypeParameter tvar : typarams) {
816 TypeVar a = (TypeVar)tvar.type;
817 a.tsym.flags_field |= UNATTRIBUTED;
818 a.setUpperBound(Type.noType);
819 if (!tvar.bounds.isEmpty()) {
820 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
821 for (JCExpression bound : tvar.bounds.tail)
822 bounds = bounds.prepend(attribType(bound, env));
823 types.setBounds(a, bounds.reverse());
824 } else {
825 // if no bounds are given, assume a single bound of
826 // java.lang.Object.
827 types.setBounds(a, List.of(syms.objectType));
828 }
829 a.tsym.flags_field &= ~UNATTRIBUTED;
830 }
831 if (checkCyclic) {
832 for (JCTypeParameter tvar : typarams) {
833 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
834 }
835 }
836 }
837
838 /**
839 * Attribute the type references in a list of annotations.
840 */
841 void attribAnnotationTypes(List<JCAnnotation> annotations,
842 Env<AttrContext> env) {
843 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
844 JCAnnotation a = al.head;
845 attribType(a.annotationType, env);
846 }
847 }
848
849 /**
850 * Attribute a "lazy constant value".
851 * @param env The env for the const value
852 * @param variable The initializer for the const value
853 * @param type The expected type, or null
854 * @see VarSymbol#setLazyConstValue
855 */
856 public Object attribLazyConstantValue(Env<AttrContext> env,
857 JCVariableDecl variable,
858 Type type) {
859
860 DiagnosticPosition prevLintPos
861 = deferredLintHandler.setPos(variable.pos());
862
863 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
864 try {
865 Type itype = attribExpr(variable.init, env, type);
866 if (variable.isImplicitlyTyped()) {
867 //fixup local variable type
868 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
869 }
870 if (itype.constValue() != null) {
871 return coerce(itype, type).constValue();
872 } else {
873 return null;
874 }
875 } finally {
876 log.useSource(prevSource);
877 deferredLintHandler.setPos(prevLintPos);
878 }
879 }
880
881 /** Attribute type reference in an `extends' or `implements' clause.
882 * Supertypes of anonymous inner classes are usually already attributed.
883 *
884 * @param tree The tree making up the type reference.
885 * @param env The environment current at the reference.
886 * @param classExpected true if only a class is expected here.
887 * @param interfaceExpected true if only an interface is expected here.
888 */
889 Type attribBase(JCTree tree,
890 Env<AttrContext> env,
891 boolean classExpected,
892 boolean interfaceExpected,
893 boolean checkExtensible) {
894 Type t = tree.type != null ?
895 tree.type :
896 attribType(tree, env);
897 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
898 }
899 Type checkBase(Type t,
900 JCTree tree,
901 Env<AttrContext> env,
902 boolean classExpected,
903 boolean interfaceExpected,
904 boolean checkExtensible) {
905 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
906 (((JCTypeApply) tree).clazz).pos() : tree.pos();
907 if (t.tsym.isAnonymous()) {
908 log.error(pos, Errors.CantInheritFromAnon);
909 return types.createErrorType(t);
910 }
911 if (t.isErroneous())
912 return t;
913 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
914 // check that type variable is already visible
915 if (t.getUpperBound() == null) {
916 log.error(pos, Errors.IllegalForwardRef);
917 return types.createErrorType(t);
918 }
919 } else {
920 t = chk.checkClassType(pos, t, checkExtensible);
921 }
922 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
923 log.error(pos, Errors.IntfExpectedHere);
924 // return errType is necessary since otherwise there might
925 // be undetected cycles which cause attribution to loop
926 return types.createErrorType(t);
927 } else if (checkExtensible &&
928 classExpected &&
929 (t.tsym.flags() & INTERFACE) != 0) {
930 log.error(pos, Errors.NoIntfExpectedHere);
931 return types.createErrorType(t);
932 }
933 if (checkExtensible &&
934 ((t.tsym.flags() & FINAL) != 0)) {
935 log.error(pos,
936 Errors.CantInheritFromFinal(t.tsym));
937 }
938 chk.checkNonCyclic(pos, t);
939 return t;
940 }
941
942 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
943 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
944 id.type = env.info.scope.owner.enclClass().type;
945 id.sym = env.info.scope.owner.enclClass();
946 return id.type;
947 }
948
949 public void visitClassDef(JCClassDecl tree) {
950 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
951 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
952 argumentAttr.withLocalCacheContext() : null);
953 try {
954 // Local and anonymous classes have not been entered yet, so we need to
955 // do it now.
956 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
957 enter.classEnter(tree, env);
958 } else {
959 // If this class declaration is part of a class level annotation,
960 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
961 // order to simplify later steps and allow for sensible error
962 // messages.
963 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
964 enter.classEnter(tree, env);
965 }
966
967 ClassSymbol c = tree.sym;
968 if (c == null) {
969 // exit in case something drastic went wrong during enter.
970 result = null;
971 } else {
972 // make sure class has been completed:
973 c.complete();
974
975 // If this class appears as an anonymous class
976 // in a superclass constructor call
977 // disable implicit outer instance from being passed.
978 // (This would be an illegal access to "this before super").
979 if (env.info.isSelfCall &&
980 env.tree.hasTag(NEWCLASS)) {
981 c.flags_field |= NOOUTERTHIS;
982 }
983 attribClass(tree.pos(), c);
984 result = tree.type = c.type;
985 }
986 } finally {
987 localCacheContext.ifPresent(LocalCacheContext::leave);
988 }
989 }
990
991 public void visitMethodDef(JCMethodDecl tree) {
992 MethodSymbol m = tree.sym;
993 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
994
995 Lint lint = env.info.lint.augment(m);
996 Lint prevLint = chk.setLint(lint);
997 MethodSymbol prevMethod = chk.setMethod(m);
998 try {
999 deferredLintHandler.flush(tree.pos());
1000 chk.checkDeprecatedAnnotation(tree.pos(), m);
1001
1002
1003 // Create a new environment with local scope
1004 // for attributing the method.
1005 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1006 localEnv.info.lint = lint;
1007
1008 attribStats(tree.typarams, localEnv);
1009
1010 // If we override any other methods, check that we do so properly.
1011 // JLS ???
1012 if (m.isStatic()) {
1013 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1014 } else {
1015 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1016 }
1017 chk.checkOverride(env, tree, m);
1018
1019 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1020 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1021 }
1022
1023 // Enter all type parameters into the local method scope.
1024 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1025 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1026
1027 ClassSymbol owner = env.enclClass.sym;
1028 if ((owner.flags() & ANNOTATION) != 0 &&
1029 (tree.params.nonEmpty() ||
1030 tree.recvparam != null))
1031 log.error(tree.params.nonEmpty() ?
1032 tree.params.head.pos() :
1033 tree.recvparam.pos(),
1034 Errors.IntfAnnotationMembersCantHaveParams);
1035
1036 // Attribute all value parameters.
1037 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1038 attribStat(l.head, localEnv);
1039 }
1040
1041 chk.checkVarargsMethodDecl(localEnv, tree);
1042
1043 // Check that type parameters are well-formed.
1044 chk.validate(tree.typarams, localEnv);
1045
1046 // Check that result type is well-formed.
1047 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1048 chk.validate(tree.restype, localEnv);
1049
1050 // Check that receiver type is well-formed.
1051 if (tree.recvparam != null) {
1052 // Use a new environment to check the receiver parameter.
1053 // Otherwise I get "might not have been initialized" errors.
1054 // Is there a better way?
1055 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1056 attribType(tree.recvparam, newEnv);
1057 chk.validate(tree.recvparam, newEnv);
1058 }
1059
1060 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1061 // lets find if this method is an accessor
1062 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1063 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1064 if (recordComponent.isPresent()) {
1065 // the method is a user defined accessor lets check that everything is fine
1066 if (!tree.sym.isPublic()) {
1067 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1068 }
1069 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1070 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1071 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1072 }
1073 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1074 log.error(tree,
1075 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1076 }
1077 if (!tree.typarams.isEmpty()) {
1078 log.error(tree,
1079 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1080 }
1081 if (tree.sym.isStatic()) {
1082 log.error(tree,
1083 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1084 }
1085 }
1086
1087 if (tree.name == names.init) {
1088 // if this a constructor other than the canonical one
1089 if ((tree.sym.flags_field & RECORD) == 0) {
1090 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1091 if (app == null ||
1092 TreeInfo.name(app.meth) != names._this ||
1093 !checkFirstConstructorStat(app, tree, false)) {
1094 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1095 }
1096 } else {
1097 // but if it is the canonical:
1098
1099 /* if user generated, then it shouldn't:
1100 * - have an accessibility stricter than that of the record type
1101 * - explicitly invoke any other constructor
1102 */
1103 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1104 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1105 log.error(tree,
1106 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1107 Errors.InvalidCanonicalConstructorInRecord(
1108 Fragments.Canonical,
1109 env.enclClass.sym.name,
1110 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1111 ) :
1112 Errors.InvalidCanonicalConstructorInRecord(
1113 Fragments.Canonical,
1114 env.enclClass.sym.name,
1115 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1116 )
1117 );
1118 }
1119
1120 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1121 if (app != null &&
1122 (TreeInfo.name(app.meth) == names._this ||
1123 TreeInfo.name(app.meth) == names._super) &&
1124 checkFirstConstructorStat(app, tree, false)) {
1125 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1126 Fragments.Canonical, env.enclClass.sym.name,
1127 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1128 }
1129 }
1130
1131 // also we want to check that no type variables have been defined
1132 if (!tree.typarams.isEmpty()) {
1133 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1134 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1135 }
1136
1137 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1138 * record components
1139 */
1140 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1141 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1142 for (JCVariableDecl param: tree.params) {
1143 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1144 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1145 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1146 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1147 Fragments.Canonical, env.enclClass.sym.name,
1148 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1149 }
1150 recordComponents = recordComponents.tail;
1151 recordFieldTypes = recordFieldTypes.tail;
1152 }
1153 }
1154 }
1155 }
1156
1157 // annotation method checks
1158 if ((owner.flags() & ANNOTATION) != 0) {
1159 // annotation method cannot have throws clause
1160 if (tree.thrown.nonEmpty()) {
1161 log.error(tree.thrown.head.pos(),
1162 Errors.ThrowsNotAllowedInIntfAnnotation);
1163 }
1164 // annotation method cannot declare type-parameters
1165 if (tree.typarams.nonEmpty()) {
1166 log.error(tree.typarams.head.pos(),
1167 Errors.IntfAnnotationMembersCantHaveTypeParams);
1168 }
1169 // validate annotation method's return type (could be an annotation type)
1170 chk.validateAnnotationType(tree.restype);
1171 // ensure that annotation method does not clash with members of Object/Annotation
1172 chk.validateAnnotationMethod(tree.pos(), m);
1173 }
1174
1175 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1176 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1177
1178 if (tree.body == null) {
1179 // Empty bodies are only allowed for
1180 // abstract, native, or interface methods, or for methods
1181 // in a retrofit signature class.
1182 if (tree.defaultValue != null) {
1183 if ((owner.flags() & ANNOTATION) == 0)
1184 log.error(tree.pos(),
1185 Errors.DefaultAllowedInIntfAnnotationMember);
1186 }
1187 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1188 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1189 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1190 if ((owner.flags() & INTERFACE) != 0) {
1191 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1192 } else {
1193 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1194 }
1195 } else if ((tree.mods.flags & NATIVE) != 0) {
1196 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1197 } else {
1198 // Add an implicit super() call unless an explicit call to
1199 // super(...) or this(...) is given
1200 // or we are compiling class java.lang.Object.
1201 if (tree.name == names.init && owner.type != syms.objectType) {
1202 JCBlock body = tree.body;
1203 if (body.stats.isEmpty() ||
1204 TreeInfo.getConstructorInvocationName(body.stats, names) == names.empty) {
1205 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1206 make.Ident(names._super), make.Idents(List.nil())));
1207 body.stats = body.stats.prepend(supCall);
1208 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1209 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1210 TreeInfo.isSuperCall(body.stats.head)) {
1211 // enum constructors are not allowed to call super
1212 // directly, so make sure there aren't any super calls
1213 // in enum constructors, except in the compiler
1214 // generated one.
1215 log.error(tree.body.stats.head.pos(),
1216 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
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 if (tree.init != null) {
1305 if ((v.flags_field & FINAL) == 0 ||
1306 !memberEnter.needsLazyConstValue(tree.init)) {
1307 // Not a compile-time constant
1308 // Attribute initializer in a new environment
1309 // with the declared variable as owner.
1310 // Check that initializer conforms to variable's declared type.
1311 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1312 initEnv.info.lint = lint;
1313 // In order to catch self-references, we set the variable's
1314 // declaration position to maximal possible value, effectively
1315 // marking the variable as undefined.
1316 initEnv.info.enclVar = v;
1317 attribExpr(tree.init, initEnv, v.type);
1318 if (tree.isImplicitlyTyped()) {
1319 //fixup local variable type
1320 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1321 }
1322 }
1323 if (tree.isImplicitlyTyped()) {
1324 setSyntheticVariableType(tree, v.type);
1325 }
1326 }
1327 result = tree.type = v.type;
1328 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1329 if (isNonArgsMethodInObject(v.name)) {
1330 log.error(tree, Errors.IllegalRecordComponentName(v));
1331 }
1332 }
1333 }
1334 finally {
1335 chk.setLint(prevLint);
1336 }
1337 }
1338
1339 private boolean isNonArgsMethodInObject(Name name) {
1340 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1341 if (s.type.getParameterTypes().isEmpty()) {
1342 return true;
1343 }
1344 }
1345 return false;
1346 }
1347
1348 Fragment canInferLocalVarType(JCVariableDecl tree) {
1349 LocalInitScanner lis = new LocalInitScanner();
1350 lis.scan(tree.init);
1351 return lis.badInferenceMsg;
1352 }
1353
1354 static class LocalInitScanner extends TreeScanner {
1355 Fragment badInferenceMsg = null;
1356 boolean needsTarget = true;
1357
1358 @Override
1359 public void visitNewArray(JCNewArray tree) {
1360 if (tree.elemtype == null && needsTarget) {
1361 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1362 }
1363 }
1364
1365 @Override
1366 public void visitLambda(JCLambda tree) {
1367 if (needsTarget) {
1368 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1369 }
1370 }
1371
1372 @Override
1373 public void visitTypeCast(JCTypeCast tree) {
1374 boolean prevNeedsTarget = needsTarget;
1375 try {
1376 needsTarget = false;
1377 super.visitTypeCast(tree);
1378 } finally {
1379 needsTarget = prevNeedsTarget;
1380 }
1381 }
1382
1383 @Override
1384 public void visitReference(JCMemberReference tree) {
1385 if (needsTarget) {
1386 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1387 }
1388 }
1389
1390 @Override
1391 public void visitNewClass(JCNewClass tree) {
1392 boolean prevNeedsTarget = needsTarget;
1393 try {
1394 needsTarget = false;
1395 super.visitNewClass(tree);
1396 } finally {
1397 needsTarget = prevNeedsTarget;
1398 }
1399 }
1400
1401 @Override
1402 public void visitApply(JCMethodInvocation tree) {
1403 boolean prevNeedsTarget = needsTarget;
1404 try {
1405 needsTarget = false;
1406 super.visitApply(tree);
1407 } finally {
1408 needsTarget = prevNeedsTarget;
1409 }
1410 }
1411 }
1412
1413 public void visitSkip(JCSkip tree) {
1414 result = null;
1415 }
1416
1417 public void visitBlock(JCBlock tree) {
1418 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1419 // Block is a static or instance initializer;
1420 // let the owner of the environment be a freshly
1421 // created BLOCK-method.
1422 Symbol fakeOwner =
1423 new MethodSymbol(tree.flags | BLOCK |
1424 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1425 env.info.scope.owner);
1426 final Env<AttrContext> localEnv =
1427 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1428
1429 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1430 // Attribute all type annotations in the block
1431 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1432 annotate.flush();
1433 attribStats(tree.stats, localEnv);
1434
1435 {
1436 // Store init and clinit type annotations with the ClassSymbol
1437 // to allow output in Gen.normalizeDefs.
1438 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1439 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1440 if ((tree.flags & STATIC) != 0) {
1441 cs.appendClassInitTypeAttributes(tas);
1442 } else {
1443 cs.appendInitTypeAttributes(tas);
1444 }
1445 }
1446 } else {
1447 // Create a new local environment with a local scope.
1448 Env<AttrContext> localEnv =
1449 env.dup(tree, env.info.dup(env.info.scope.dup()));
1450 try {
1451 attribStats(tree.stats, localEnv);
1452 } finally {
1453 localEnv.info.scope.leave();
1454 }
1455 }
1456 result = null;
1457 }
1458
1459 public void visitDoLoop(JCDoWhileLoop tree) {
1460 attribStat(tree.body, env.dup(tree));
1461 attribExpr(tree.cond, env, syms.booleanType);
1462 if (!breaksOutOf(tree, tree.body)) {
1463 //include condition's body when false after the while, if cannot get out of the loop
1464 MatchBindings condBindings = matchBindings;
1465 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1466 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1467 }
1468 result = null;
1469 }
1470
1471 public void visitWhileLoop(JCWhileLoop tree) {
1472 attribExpr(tree.cond, env, syms.booleanType);
1473 MatchBindings condBindings = matchBindings;
1474 // include condition's bindings when true in the body:
1475 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1476 try {
1477 attribStat(tree.body, whileEnv.dup(tree));
1478 } finally {
1479 whileEnv.info.scope.leave();
1480 }
1481 if (!breaksOutOf(tree, tree.body)) {
1482 //include condition's bindings when false after the while, if cannot get out of the loop
1483 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1484 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1485 }
1486 result = null;
1487 }
1488
1489 private boolean breaksOutOf(JCTree loop, JCTree body) {
1490 preFlow(body);
1491 return flow.breaksOutOf(env, loop, body, make);
1492 }
1493
1494 public void visitForLoop(JCForLoop tree) {
1495 Env<AttrContext> loopEnv =
1496 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1497 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1498 try {
1499 attribStats(tree.init, loopEnv);
1500 if (tree.cond != null) {
1501 attribExpr(tree.cond, loopEnv, syms.booleanType);
1502 // include condition's bindings when true in the body and step:
1503 condBindings = matchBindings;
1504 }
1505 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1506 try {
1507 bodyEnv.tree = tree; // before, we were not in loop!
1508 attribStats(tree.step, bodyEnv);
1509 attribStat(tree.body, bodyEnv);
1510 } finally {
1511 bodyEnv.info.scope.leave();
1512 }
1513 result = null;
1514 }
1515 finally {
1516 loopEnv.info.scope.leave();
1517 }
1518 if (!breaksOutOf(tree, tree.body)) {
1519 //include condition's body when false after the while, if cannot get out of the loop
1520 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1521 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1522 }
1523 }
1524
1525 public void visitForeachLoop(JCEnhancedForLoop tree) {
1526 Env<AttrContext> loopEnv =
1527 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1528 try {
1529 //the Formal Parameter of a for-each loop is not in the scope when
1530 //attributing the for-each expression; we mimic this by attributing
1531 //the for-each expression first (against original scope).
1532 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1533 chk.checkNonVoid(tree.pos(), exprType);
1534 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1535 if (elemtype == null) {
1536 // or perhaps expr implements Iterable<T>?
1537 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1538 if (base == null) {
1539 log.error(tree.expr.pos(),
1540 Errors.ForeachNotApplicableToType(exprType,
1541 Fragments.TypeReqArrayOrIterable));
1542 elemtype = types.createErrorType(exprType);
1543 } else {
1544 List<Type> iterableParams = base.allparams();
1545 elemtype = iterableParams.isEmpty()
1546 ? syms.objectType
1547 : types.wildUpperBound(iterableParams.head);
1548
1549 // Check the return type of the method iterator().
1550 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1551 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1552 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1553 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1554 log.error(tree.pos(),
1555 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1556 }
1557 }
1558 }
1559 if (tree.var.isImplicitlyTyped()) {
1560 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1561 setSyntheticVariableType(tree.var, inferredType);
1562 }
1563 attribStat(tree.var, loopEnv);
1564 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1565 loopEnv.tree = tree; // before, we were not in loop!
1566 attribStat(tree.body, loopEnv);
1567 result = null;
1568 }
1569 finally {
1570 loopEnv.info.scope.leave();
1571 }
1572 }
1573
1574 public void visitLabelled(JCLabeledStatement tree) {
1575 // Check that label is not used in an enclosing statement
1576 Env<AttrContext> env1 = env;
1577 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1578 if (env1.tree.hasTag(LABELLED) &&
1579 ((JCLabeledStatement) env1.tree).label == tree.label) {
1580 log.error(tree.pos(),
1581 Errors.LabelAlreadyInUse(tree.label));
1582 break;
1583 }
1584 env1 = env1.next;
1585 }
1586
1587 attribStat(tree.body, env.dup(tree));
1588 result = null;
1589 }
1590
1591 public void visitSwitch(JCSwitch tree) {
1592 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1593 attribStats(c.stats, caseEnv);
1594 });
1595 result = null;
1596 }
1597
1598 public void visitSwitchExpression(JCSwitchExpression tree) {
1599 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1600 PolyKind.STANDALONE : PolyKind.POLY;
1601
1602 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1603 //this means we are returning a poly conditional from void-compatible lambda expression
1604 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1605 result = tree.type = types.createErrorType(resultInfo.pt);
1606 return;
1607 }
1608
1609 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1610 unknownExprInfo :
1611 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1612
1613 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1614 ListBuffer<Type> caseTypes = new ListBuffer<>();
1615
1616 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1617 caseEnv.info.yieldResult = condInfo;
1618 attribStats(c.stats, caseEnv);
1619 new TreeScanner() {
1620 @Override
1621 public void visitYield(JCYield brk) {
1622 if (brk.target == tree) {
1623 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1624 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1625 }
1626 super.visitYield(brk);
1627 }
1628
1629 @Override public void visitClassDef(JCClassDecl tree) {}
1630 @Override public void visitLambda(JCLambda tree) {}
1631 }.scan(c.stats);
1632 });
1633
1634 if (tree.cases.isEmpty()) {
1635 log.error(tree.pos(),
1636 Errors.SwitchExpressionEmpty);
1637 } else if (caseTypes.isEmpty()) {
1638 log.error(tree.pos(),
1639 Errors.SwitchExpressionNoResultExpressions);
1640 }
1641
1642 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1643
1644 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1645 }
1646 //where:
1647 CheckContext switchExpressionContext(CheckContext checkContext) {
1648 return new Check.NestedCheckContext(checkContext) {
1649 //this will use enclosing check context to check compatibility of
1650 //subexpression against target type; if we are in a method check context,
1651 //depending on whether boxing is allowed, we could have incompatibilities
1652 @Override
1653 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1654 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1655 }
1656 };
1657 }
1658
1659 private void handleSwitch(JCTree switchTree,
1660 JCExpression selector,
1661 List<JCCase> cases,
1662 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1663 Type seltype = attribExpr(selector, env);
1664
1665 Env<AttrContext> switchEnv =
1666 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1667
1668 try {
1669 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1670 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1671 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1672 boolean patternSwitch;
1673 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1674 !types.isAssignable(seltype, syms.intType)) {
1675 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1676 patternSwitch = true;
1677 } else {
1678 patternSwitch = cases.stream()
1679 .flatMap(c -> c.labels.stream())
1680 .anyMatch(l -> l.isPattern());
1681 }
1682
1683 // Attribute all cases and
1684 // check that there are no duplicate case labels or default clauses.
1685 Set<Object> labels = new HashSet<>(); // The set of case labels.
1686 List<Type> coveredTypesForPatterns = List.nil();
1687 List<Type> coveredTypesForConstants = List.nil();
1688 boolean hasDefault = false; // Is there a default label?
1689 boolean hasTotalPattern = false; // Is there a total pattern?
1690 boolean hasNullPattern = false; // Is there a null pattern?
1691 CaseTree.CaseKind caseKind = null;
1692 boolean wasError = false;
1693 MatchBindings prevBindings = null;
1694 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1695 JCCase c = l.head;
1696 if (caseKind == null) {
1697 caseKind = c.caseKind;
1698 } else if (caseKind != c.caseKind && !wasError) {
1699 log.error(c.pos(),
1700 Errors.SwitchMixingCaseTypes);
1701 wasError = true;
1702 }
1703 MatchBindings currentBindings = prevBindings;
1704 boolean wasTotalPattern = hasTotalPattern;
1705 for (JCCaseLabel pat : c.labels) {
1706 if (pat.isExpression()) {
1707 JCExpression expr = (JCExpression) pat;
1708 if (TreeInfo.isNull(expr)) {
1709 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1710 if (hasNullPattern) {
1711 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1712 } else if (wasTotalPattern) {
1713 log.error(pat.pos(), Errors.PatternDominated);
1714 }
1715 hasNullPattern = true;
1716 attribExpr(expr, switchEnv, seltype);
1717 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1718 } else if (enumSwitch) {
1719 Symbol sym = enumConstant(expr, seltype);
1720 if (sym == null) {
1721 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1722 } else if (!labels.add(sym)) {
1723 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1724 } else {
1725 checkCaseLabelDominated(pat.pos(), coveredTypesForConstants, sym.type);
1726 }
1727 } else if (errorEnumSwitch) {
1728 //error recovery: the selector is erroneous, and all the case labels
1729 //are identifiers. This could be an enum switch - don't report resolve
1730 //error for the case label:
1731 var prevResolveHelper = rs.basicLogResolveHelper;
1732 try {
1733 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1734 attribExpr(pat, switchEnv, seltype);
1735 } finally {
1736 rs.basicLogResolveHelper = prevResolveHelper;
1737 }
1738 } else {
1739 ResultInfo valTypInfo = new ResultInfo(KindSelector.VAL_TYP,
1740 !seltype.hasTag(ERROR) ? seltype
1741 : Type.noType);
1742 Type pattype = attribTree(expr, switchEnv, valTypInfo);
1743 if (!pattype.hasTag(ERROR)) {
1744 if (pattype.constValue() == null) {
1745 Symbol s = TreeInfo.symbol(expr);
1746 if (s != null && s.kind == TYP && allowPatternSwitch) {
1747 log.error(expr.pos(),
1748 Errors.PatternExpected);
1749 } else {
1750 log.error(expr.pos(),
1751 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1752 }
1753 } else if (!stringSwitch && !types.isAssignable(seltype, syms.intType)) {
1754 log.error(pat.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1755 } else if (!labels.add(pattype.constValue())) {
1756 log.error(c.pos(), Errors.DuplicateCaseLabel);
1757 } else {
1758 checkCaseLabelDominated(pat.pos(), coveredTypesForConstants, types.boxedTypeOrType(pattype));
1759 }
1760 }
1761 }
1762 } else if (pat.hasTag(DEFAULTCASELABEL)) {
1763 if (hasDefault) {
1764 log.error(pat.pos(), Errors.DuplicateDefaultLabel);
1765 } else if (hasTotalPattern) {
1766 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1767 }
1768 hasDefault = true;
1769 matchBindings = MatchBindingsComputer.EMPTY;
1770 } else {
1771 //binding pattern
1772 attribExpr(pat, switchEnv);
1773 var primary = TreeInfo.primaryPatternType((JCPattern) pat);
1774 Type primaryType = primary.type();
1775 if (!primaryType.hasTag(TYPEVAR)) {
1776 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1777 }
1778 checkCastablePattern(pat.pos(), seltype, primaryType);
1779 Type patternType = types.erasure(primaryType);
1780 boolean isTotal = primary.unconditional() &&
1781 !patternType.isErroneous() &&
1782 types.isSubtype(types.erasure(seltype), patternType);
1783 if (isTotal) {
1784 if (hasTotalPattern) {
1785 log.error(pat.pos(), Errors.DuplicateTotalPattern);
1786 } else if (hasDefault) {
1787 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1788 }
1789 hasTotalPattern = true;
1790 }
1791 checkCaseLabelDominated(pat.pos(), coveredTypesForPatterns, patternType);
1792 if (!patternType.isErroneous()) {
1793 coveredTypesForConstants = coveredTypesForConstants.prepend(patternType);
1794 if (primary.unconditional()) {
1795 coveredTypesForPatterns = coveredTypesForPatterns.prepend(patternType);
1796 }
1797 }
1798 }
1799 currentBindings = matchBindingsComputer.switchCase(pat, currentBindings, matchBindings);
1800 }
1801 Env<AttrContext> caseEnv =
1802 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1803 try {
1804 attribCase.accept(c, caseEnv);
1805 } finally {
1806 caseEnv.info.scope.leave();
1807 }
1808 addVars(c.stats, switchEnv.info.scope);
1809
1810 preFlow(c);
1811 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1812
1813 prevBindings = c.caseKind == CaseTree.CaseKind.STATEMENT && c.completesNormally ? currentBindings
1814 : null;
1815 }
1816 if (patternSwitch) {
1817 chk.checkSwitchCaseStructure(cases);
1818 }
1819 if (switchTree.hasTag(SWITCH)) {
1820 ((JCSwitch) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1821 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1822 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1823 ((JCSwitchExpression) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1824 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1825 } else {
1826 Assert.error(switchTree.getTag().name());
1827 }
1828 } finally {
1829 switchEnv.info.scope.leave();
1830 }
1831 }
1832 // where
1833 /** Add any variables defined in stats to the switch scope. */
1834 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1835 for (;stats.nonEmpty(); stats = stats.tail) {
1836 JCTree stat = stats.head;
1837 if (stat.hasTag(VARDEF))
1838 switchScope.enter(((JCVariableDecl) stat).sym);
1839 }
1840 }
1841 private void checkCaseLabelDominated(DiagnosticPosition pos,
1842 List<Type> coveredTypes, Type patternType) {
1843 for (Type existing : coveredTypes) {
1844 if (types.isSubtype(patternType, existing)) {
1845 log.error(pos, Errors.PatternDominated);
1846 }
1847 }
1848 }
1849 // where
1850 /** Return the selected enumeration constant symbol, or null. */
1851 private Symbol enumConstant(JCTree tree, Type enumType) {
1852 if (tree.hasTag(IDENT)) {
1853 JCIdent ident = (JCIdent)tree;
1854 Name name = ident.name;
1855 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1856 if (sym.kind == VAR) {
1857 Symbol s = ident.sym = sym;
1858 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1859 ident.type = s.type;
1860 return ((s.flags_field & Flags.ENUM) == 0)
1861 ? null : s;
1862 }
1863 }
1864 }
1865 return null;
1866 }
1867
1868 public void visitSynchronized(JCSynchronized tree) {
1869 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1870 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1871 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1872 }
1873 attribStat(tree.body, env);
1874 result = null;
1875 }
1876 // where
1877 private boolean isValueBased(Type t) {
1878 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1879 }
1880
1881
1882 public void visitTry(JCTry tree) {
1883 // Create a new local environment with a local
1884 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1885 try {
1886 boolean isTryWithResource = tree.resources.nonEmpty();
1887 // Create a nested environment for attributing the try block if needed
1888 Env<AttrContext> tryEnv = isTryWithResource ?
1889 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1890 localEnv;
1891 try {
1892 // Attribute resource declarations
1893 for (JCTree resource : tree.resources) {
1894 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1895 @Override
1896 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1897 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1898 }
1899 };
1900 ResultInfo twrResult =
1901 new ResultInfo(KindSelector.VAR,
1902 syms.autoCloseableType,
1903 twrContext);
1904 if (resource.hasTag(VARDEF)) {
1905 attribStat(resource, tryEnv);
1906 twrResult.check(resource, resource.type);
1907
1908 //check that resource type cannot throw InterruptedException
1909 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1910
1911 VarSymbol var = ((JCVariableDecl) resource).sym;
1912 var.setData(ElementKind.RESOURCE_VARIABLE);
1913 } else {
1914 attribTree(resource, tryEnv, twrResult);
1915 }
1916 }
1917 // Attribute body
1918 attribStat(tree.body, tryEnv);
1919 } finally {
1920 if (isTryWithResource)
1921 tryEnv.info.scope.leave();
1922 }
1923
1924 // Attribute catch clauses
1925 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1926 JCCatch c = l.head;
1927 Env<AttrContext> catchEnv =
1928 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1929 try {
1930 Type ctype = attribStat(c.param, catchEnv);
1931 if (TreeInfo.isMultiCatch(c)) {
1932 //multi-catch parameter is implicitly marked as final
1933 c.param.sym.flags_field |= FINAL | UNION;
1934 }
1935 if (c.param.sym.kind == VAR) {
1936 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1937 }
1938 chk.checkType(c.param.vartype.pos(),
1939 chk.checkClassType(c.param.vartype.pos(), ctype),
1940 syms.throwableType);
1941 attribStat(c.body, catchEnv);
1942 } finally {
1943 catchEnv.info.scope.leave();
1944 }
1945 }
1946
1947 // Attribute finalizer
1948 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1949 result = null;
1950 }
1951 finally {
1952 localEnv.info.scope.leave();
1953 }
1954 }
1955
1956 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1957 if (!resource.isErroneous() &&
1958 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1959 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1960 Symbol close = syms.noSymbol;
1961 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1962 try {
1963 close = rs.resolveQualifiedMethod(pos,
1964 env,
1965 types.skipTypeVars(resource, false),
1966 names.close,
1967 List.nil(),
1968 List.nil());
1969 }
1970 finally {
1971 log.popDiagnosticHandler(discardHandler);
1972 }
1973 if (close.kind == MTH &&
1974 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1975 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1976 env.info.lint.isEnabled(LintCategory.TRY)) {
1977 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1978 }
1979 }
1980 }
1981
1982 public void visitConditional(JCConditional tree) {
1983 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1984 MatchBindings condBindings = matchBindings;
1985
1986 tree.polyKind = (!allowPoly ||
1987 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
1988 isBooleanOrNumeric(env, tree)) ?
1989 PolyKind.STANDALONE : PolyKind.POLY;
1990
1991 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1992 //this means we are returning a poly conditional from void-compatible lambda expression
1993 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
1994 result = tree.type = types.createErrorType(resultInfo.pt);
1995 return;
1996 }
1997
1998 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1999 unknownExprInfo :
2000 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2001
2002
2003 // x ? y : z
2004 // include x's bindings when true in y
2005 // include x's bindings when false in z
2006
2007 Type truetype;
2008 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2009 try {
2010 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2011 } finally {
2012 trueEnv.info.scope.leave();
2013 }
2014
2015 MatchBindings trueBindings = matchBindings;
2016
2017 Type falsetype;
2018 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2019 try {
2020 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2021 } finally {
2022 falseEnv.info.scope.leave();
2023 }
2024
2025 MatchBindings falseBindings = matchBindings;
2026
2027 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2028 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2029 List.of(truetype, falsetype)) : pt();
2030 if (condtype.constValue() != null &&
2031 truetype.constValue() != null &&
2032 falsetype.constValue() != null &&
2033 !owntype.hasTag(NONE)) {
2034 //constant folding
2035 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2036 }
2037 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2038 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2039 }
2040 //where
2041 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2042 switch (tree.getTag()) {
2043 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2044 ((JCLiteral)tree).typetag == BOOLEAN ||
2045 ((JCLiteral)tree).typetag == BOT;
2046 case LAMBDA: case REFERENCE: return false;
2047 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2048 case CONDEXPR:
2049 JCConditional condTree = (JCConditional)tree;
2050 return isBooleanOrNumeric(env, condTree.truepart) &&
2051 isBooleanOrNumeric(env, condTree.falsepart);
2052 case APPLY:
2053 JCMethodInvocation speculativeMethodTree =
2054 (JCMethodInvocation)deferredAttr.attribSpeculative(
2055 tree, env, unknownExprInfo,
2056 argumentAttr.withLocalCacheContext());
2057 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2058 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2059 env.enclClass.type :
2060 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2061 Type owntype = types.memberType(receiverType, msym).getReturnType();
2062 return primitiveOrBoxed(owntype);
2063 case NEWCLASS:
2064 JCExpression className =
2065 removeClassParams.translate(((JCNewClass)tree).clazz);
2066 JCExpression speculativeNewClassTree =
2067 (JCExpression)deferredAttr.attribSpeculative(
2068 className, env, unknownTypeInfo,
2069 argumentAttr.withLocalCacheContext());
2070 return primitiveOrBoxed(speculativeNewClassTree.type);
2071 default:
2072 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2073 argumentAttr.withLocalCacheContext()).type;
2074 return primitiveOrBoxed(speculativeType);
2075 }
2076 }
2077 //where
2078 boolean primitiveOrBoxed(Type t) {
2079 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2080 }
2081
2082 TreeTranslator removeClassParams = new TreeTranslator() {
2083 @Override
2084 public void visitTypeApply(JCTypeApply tree) {
2085 result = translate(tree.clazz);
2086 }
2087 };
2088
2089 CheckContext conditionalContext(CheckContext checkContext) {
2090 return new Check.NestedCheckContext(checkContext) {
2091 //this will use enclosing check context to check compatibility of
2092 //subexpression against target type; if we are in a method check context,
2093 //depending on whether boxing is allowed, we could have incompatibilities
2094 @Override
2095 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2096 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2097 }
2098 };
2099 }
2100
2101 /** Compute the type of a conditional expression, after
2102 * checking that it exists. See JLS 15.25. Does not take into
2103 * account the special case where condition and both arms
2104 * are constants.
2105 *
2106 * @param pos The source position to be used for error
2107 * diagnostics.
2108 * @param thentype The type of the expression's then-part.
2109 * @param elsetype The type of the expression's else-part.
2110 */
2111 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2112 if (condTypes.isEmpty()) {
2113 return syms.objectType; //TODO: how to handle?
2114 }
2115 Type first = condTypes.head;
2116 // If same type, that is the result
2117 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2118 return first.baseType();
2119
2120 List<Type> unboxedTypes = condTypes.stream()
2121 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2122 .collect(List.collector());
2123
2124 // Otherwise, if both arms can be converted to a numeric
2125 // type, return the least numeric type that fits both arms
2126 // (i.e. return larger of the two, or return int if one
2127 // arm is short, the other is char).
2128 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2129 // If one arm has an integer subrange type (i.e., byte,
2130 // short, or char), and the other is an integer constant
2131 // that fits into the subrange, return the subrange type.
2132 for (Type type : unboxedTypes) {
2133 if (!type.getTag().isStrictSubRangeOf(INT)) {
2134 continue;
2135 }
2136 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2137 return type.baseType();
2138 }
2139
2140 for (TypeTag tag : primitiveTags) {
2141 Type candidate = syms.typeOfTag[tag.ordinal()];
2142 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2143 return candidate;
2144 }
2145 }
2146 }
2147
2148 // Those were all the cases that could result in a primitive
2149 condTypes = condTypes.stream()
2150 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2151 .collect(List.collector());
2152
2153 for (Type type : condTypes) {
2154 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2155 return type.baseType();
2156 }
2157
2158 Iterator<DiagnosticPosition> posIt = positions.iterator();
2159
2160 condTypes = condTypes.stream()
2161 .map(t -> chk.checkNonVoid(posIt.next(), t))
2162 .collect(List.collector());
2163
2164 // both are known to be reference types. The result is
2165 // lub(thentype,elsetype). This cannot fail, as it will
2166 // always be possible to infer "Object" if nothing better.
2167 return types.lub(condTypes.stream()
2168 .map(t -> t.baseType())
2169 .filter(t -> !t.hasTag(BOT))
2170 .collect(List.collector()));
2171 }
2172
2173 static final TypeTag[] primitiveTags = new TypeTag[]{
2174 BYTE,
2175 CHAR,
2176 SHORT,
2177 INT,
2178 LONG,
2179 FLOAT,
2180 DOUBLE,
2181 BOOLEAN,
2182 };
2183
2184 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2185 return bindingEnv(env, env.tree, bindings);
2186 }
2187
2188 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2189 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2190 bindings.forEach(env1.info.scope::enter);
2191 return env1;
2192 }
2193
2194 public void visitIf(JCIf tree) {
2195 attribExpr(tree.cond, env, syms.booleanType);
2196
2197 // if (x) { y } [ else z ]
2198 // include x's bindings when true in y
2199 // include x's bindings when false in z
2200
2201 MatchBindings condBindings = matchBindings;
2202 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2203
2204 try {
2205 attribStat(tree.thenpart, thenEnv);
2206 } finally {
2207 thenEnv.info.scope.leave();
2208 }
2209
2210 preFlow(tree.thenpart);
2211 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2212 boolean aliveAfterElse;
2213
2214 if (tree.elsepart != null) {
2215 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2216 try {
2217 attribStat(tree.elsepart, elseEnv);
2218 } finally {
2219 elseEnv.info.scope.leave();
2220 }
2221 preFlow(tree.elsepart);
2222 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2223 } else {
2224 aliveAfterElse = true;
2225 }
2226
2227 chk.checkEmptyIf(tree);
2228
2229 List<BindingSymbol> afterIfBindings = List.nil();
2230
2231 if (aliveAfterThen && !aliveAfterElse) {
2232 afterIfBindings = condBindings.bindingsWhenTrue;
2233 } else if (aliveAfterElse && !aliveAfterThen) {
2234 afterIfBindings = condBindings.bindingsWhenFalse;
2235 }
2236
2237 afterIfBindings.forEach(env.info.scope::enter);
2238 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2239
2240 result = null;
2241 }
2242
2243 void preFlow(JCTree tree) {
2244 attrRecover.doRecovery();
2245 new PostAttrAnalyzer() {
2246 @Override
2247 public void scan(JCTree tree) {
2248 if (tree == null ||
2249 (tree.type != null &&
2250 tree.type == Type.stuckType)) {
2251 //don't touch stuck expressions!
2252 return;
2253 }
2254 super.scan(tree);
2255 }
2256
2257 @Override
2258 public void visitClassDef(JCClassDecl that) {
2259 if (that.sym != null) {
2260 // Method preFlow shouldn't visit class definitions
2261 // that have not been entered and attributed.
2262 // See JDK-8254557 and JDK-8203277 for more details.
2263 super.visitClassDef(that);
2264 }
2265 }
2266
2267 @Override
2268 public void visitLambda(JCLambda that) {
2269 if (that.type != null) {
2270 // Method preFlow shouldn't visit lambda expressions
2271 // that have not been entered and attributed.
2272 // See JDK-8254557 and JDK-8203277 for more details.
2273 super.visitLambda(that);
2274 }
2275 }
2276 }.scan(tree);
2277 }
2278
2279 public void visitExec(JCExpressionStatement tree) {
2280 //a fresh environment is required for 292 inference to work properly ---
2281 //see Infer.instantiatePolymorphicSignatureInstance()
2282 Env<AttrContext> localEnv = env.dup(tree);
2283 attribExpr(tree.expr, localEnv);
2284 result = null;
2285 }
2286
2287 public void visitBreak(JCBreak tree) {
2288 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2289 result = null;
2290 }
2291
2292 public void visitYield(JCYield tree) {
2293 if (env.info.yieldResult != null) {
2294 attribTree(tree.value, env, env.info.yieldResult);
2295 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2296 } else {
2297 log.error(tree.pos(), tree.value.hasTag(PARENS)
2298 ? Errors.NoSwitchExpressionQualify
2299 : Errors.NoSwitchExpression);
2300 attribTree(tree.value, env, unknownExprInfo);
2301 }
2302 result = null;
2303 }
2304
2305 public void visitContinue(JCContinue tree) {
2306 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2307 result = null;
2308 }
2309 //where
2310 /** Return the target of a break, continue or yield statement,
2311 * if it exists, report an error if not.
2312 * Note: The target of a labelled break or continue is the
2313 * (non-labelled) statement tree referred to by the label,
2314 * not the tree representing the labelled statement itself.
2315 *
2316 * @param pos The position to be used for error diagnostics
2317 * @param tag The tag of the jump statement. This is either
2318 * Tree.BREAK or Tree.CONTINUE.
2319 * @param label The label of the jump statement, or null if no
2320 * label is given.
2321 * @param env The environment current at the jump statement.
2322 */
2323 private JCTree findJumpTarget(DiagnosticPosition pos,
2324 JCTree.Tag tag,
2325 Name label,
2326 Env<AttrContext> env) {
2327 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2328
2329 if (jumpTarget.snd != null) {
2330 log.error(pos, jumpTarget.snd);
2331 }
2332
2333 return jumpTarget.fst;
2334 }
2335 /** Return the target of a break or continue statement, if it exists,
2336 * report an error if not.
2337 * Note: The target of a labelled break or continue is the
2338 * (non-labelled) statement tree referred to by the label,
2339 * not the tree representing the labelled statement itself.
2340 *
2341 * @param tag The tag of the jump statement. This is either
2342 * Tree.BREAK or Tree.CONTINUE.
2343 * @param label The label of the jump statement, or null if no
2344 * label is given.
2345 * @param env The environment current at the jump statement.
2346 */
2347 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2348 Name label,
2349 Env<AttrContext> env) {
2350 // Search environments outwards from the point of jump.
2351 Env<AttrContext> env1 = env;
2352 JCDiagnostic.Error pendingError = null;
2353 LOOP:
2354 while (env1 != null) {
2355 switch (env1.tree.getTag()) {
2356 case LABELLED:
2357 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2358 if (label == labelled.label) {
2359 // If jump is a continue, check that target is a loop.
2360 if (tag == CONTINUE) {
2361 if (!labelled.body.hasTag(DOLOOP) &&
2362 !labelled.body.hasTag(WHILELOOP) &&
2363 !labelled.body.hasTag(FORLOOP) &&
2364 !labelled.body.hasTag(FOREACHLOOP)) {
2365 pendingError = Errors.NotLoopLabel(label);
2366 }
2367 // Found labelled statement target, now go inwards
2368 // to next non-labelled tree.
2369 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2370 } else {
2371 return Pair.of(labelled, pendingError);
2372 }
2373 }
2374 break;
2375 case DOLOOP:
2376 case WHILELOOP:
2377 case FORLOOP:
2378 case FOREACHLOOP:
2379 if (label == null) return Pair.of(env1.tree, pendingError);
2380 break;
2381 case SWITCH:
2382 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2383 break;
2384 case SWITCH_EXPRESSION:
2385 if (tag == YIELD) {
2386 return Pair.of(env1.tree, null);
2387 } else if (tag == BREAK) {
2388 pendingError = Errors.BreakOutsideSwitchExpression;
2389 } else {
2390 pendingError = Errors.ContinueOutsideSwitchExpression;
2391 }
2392 break;
2393 case LAMBDA:
2394 case METHODDEF:
2395 case CLASSDEF:
2396 break LOOP;
2397 default:
2398 }
2399 env1 = env1.next;
2400 }
2401 if (label != null)
2402 return Pair.of(null, Errors.UndefLabel(label));
2403 else if (pendingError != null)
2404 return Pair.of(null, pendingError);
2405 else if (tag == CONTINUE)
2406 return Pair.of(null, Errors.ContOutsideLoop);
2407 else
2408 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2409 }
2410
2411 public void visitReturn(JCReturn tree) {
2412 // Check that there is an enclosing method which is
2413 // nested within than the enclosing class.
2414 if (env.info.returnResult == null) {
2415 log.error(tree.pos(), Errors.RetOutsideMeth);
2416 } else if (env.info.yieldResult != null) {
2417 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2418 } else if (!env.info.isLambda &&
2419 !env.info.isNewClass &&
2420 env.enclMethod != null &&
2421 TreeInfo.isCompactConstructor(env.enclMethod)) {
2422 log.error(env.enclMethod,
2423 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2424 } else {
2425 // Attribute return expression, if it exists, and check that
2426 // it conforms to result type of enclosing method.
2427 if (tree.expr != null) {
2428 if (env.info.returnResult.pt.hasTag(VOID)) {
2429 env.info.returnResult.checkContext.report(tree.expr.pos(),
2430 diags.fragment(Fragments.UnexpectedRetVal));
2431 }
2432 attribTree(tree.expr, env, env.info.returnResult);
2433 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2434 !env.info.returnResult.pt.hasTag(NONE)) {
2435 env.info.returnResult.checkContext.report(tree.pos(),
2436 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2437 }
2438 }
2439 result = null;
2440 }
2441
2442 public void visitThrow(JCThrow tree) {
2443 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
2444 if (allowPoly) {
2445 chk.checkType(tree, owntype, syms.throwableType);
2446 }
2447 result = null;
2448 }
2449
2450 public void visitAssert(JCAssert tree) {
2451 attribExpr(tree.cond, env, syms.booleanType);
2452 if (tree.detail != null) {
2453 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2454 }
2455 result = null;
2456 }
2457
2458 /** Visitor method for method invocations.
2459 * NOTE: The method part of an application will have in its type field
2460 * the return type of the method, not the method's type itself!
2461 */
2462 public void visitApply(JCMethodInvocation tree) {
2463 // The local environment of a method application is
2464 // a new environment nested in the current one.
2465 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2466
2467 // The types of the actual method arguments.
2468 List<Type> argtypes;
2469
2470 // The types of the actual method type arguments.
2471 List<Type> typeargtypes = null;
2472
2473 Name methName = TreeInfo.name(tree.meth);
2474
2475 boolean isConstructorCall =
2476 methName == names._this || methName == names._super;
2477
2478 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2479 if (isConstructorCall) {
2480 // We are seeing a ...this(...) or ...super(...) call.
2481 // Check that this is the first statement in a constructor.
2482 checkFirstConstructorStat(tree, env.enclMethod, true);
2483
2484 // Record the fact
2485 // that this is a constructor call (using isSelfCall).
2486 localEnv.info.isSelfCall = true;
2487
2488 // Attribute arguments, yielding list of argument types.
2489 localEnv.info.constructorArgs = true;
2490 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2491 localEnv.info.constructorArgs = false;
2492 argtypes = argtypesBuf.toList();
2493 typeargtypes = attribTypes(tree.typeargs, localEnv);
2494
2495 // Variable `site' points to the class in which the called
2496 // constructor is defined.
2497 Type site = env.enclClass.sym.type;
2498 if (methName == names._super) {
2499 if (site == syms.objectType) {
2500 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2501 site = types.createErrorType(syms.objectType);
2502 } else {
2503 site = types.supertype(site);
2504 }
2505 }
2506
2507 if (site.hasTag(CLASS)) {
2508 Type encl = site.getEnclosingType();
2509 while (encl != null && encl.hasTag(TYPEVAR))
2510 encl = encl.getUpperBound();
2511 if (encl.hasTag(CLASS)) {
2512 // we are calling a nested class
2513
2514 if (tree.meth.hasTag(SELECT)) {
2515 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2516
2517 // We are seeing a prefixed call, of the form
2518 // <expr>.super(...).
2519 // Check that the prefix expression conforms
2520 // to the outer instance type of the class.
2521 chk.checkRefType(qualifier.pos(),
2522 attribExpr(qualifier, localEnv,
2523 encl));
2524 } else if (methName == names._super) {
2525 // qualifier omitted; check for existence
2526 // of an appropriate implicit qualifier.
2527 rs.resolveImplicitThis(tree.meth.pos(),
2528 localEnv, site, true);
2529 }
2530 } else if (tree.meth.hasTag(SELECT)) {
2531 log.error(tree.meth.pos(),
2532 Errors.IllegalQualNotIcls(site.tsym));
2533 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2534 }
2535
2536 // if we're calling a java.lang.Enum constructor,
2537 // prefix the implicit String and int parameters
2538 if (site.tsym == syms.enumSym)
2539 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2540
2541 // Resolve the called constructor under the assumption
2542 // that we are referring to a superclass instance of the
2543 // current instance (JLS ???).
2544 boolean selectSuperPrev = localEnv.info.selectSuper;
2545 localEnv.info.selectSuper = true;
2546 localEnv.info.pendingResolutionPhase = null;
2547 Symbol sym = rs.resolveConstructor(
2548 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2549 localEnv.info.selectSuper = selectSuperPrev;
2550
2551 // Set method symbol to resolved constructor...
2552 TreeInfo.setSymbol(tree.meth, sym);
2553
2554 // ...and check that it is legal in the current context.
2555 // (this will also set the tree's type)
2556 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2557 checkId(tree.meth, site, sym, localEnv,
2558 new ResultInfo(kind, mpt));
2559 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2560 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2561 }
2562 // Otherwise, `site' is an error type and we do nothing
2563 result = tree.type = syms.voidType;
2564 } else {
2565 // Otherwise, we are seeing a regular method call.
2566 // Attribute the arguments, yielding list of argument types, ...
2567 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2568 argtypes = argtypesBuf.toList();
2569 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2570
2571 // ... and attribute the method using as a prototype a methodtype
2572 // whose formal argument types is exactly the list of actual
2573 // arguments (this will also set the method symbol).
2574 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2575 localEnv.info.pendingResolutionPhase = null;
2576 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2577
2578 // Compute the result type.
2579 Type restype = mtype.getReturnType();
2580 if (restype.hasTag(WILDCARD))
2581 throw new AssertionError(mtype);
2582
2583 Type qualifier = (tree.meth.hasTag(SELECT))
2584 ? ((JCFieldAccess) tree.meth).selected.type
2585 : env.enclClass.sym.type;
2586 Symbol msym = TreeInfo.symbol(tree.meth);
2587 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2588
2589 chk.checkRefTypes(tree.typeargs, typeargtypes);
2590
2591 // Check that value of resulting type is admissible in the
2592 // current context. Also, capture the return type
2593 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2594 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2595 }
2596 chk.validate(tree.typeargs, localEnv);
2597 }
2598 //where
2599 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2600 if (msym != null &&
2601 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2602 methodName == names.getClass &&
2603 argtypes.isEmpty()) {
2604 // as a special case, x.getClass() has type Class<? extends |X|>
2605 return new ClassType(restype.getEnclosingType(),
2606 List.of(new WildcardType(types.erasure(qualifierType),
2607 BoundKind.EXTENDS,
2608 syms.boundClass)),
2609 restype.tsym,
2610 restype.getMetadata());
2611 } else if (msym != null &&
2612 msym.owner == syms.arrayClass &&
2613 methodName == names.clone &&
2614 types.isArray(qualifierType)) {
2615 // as a special case, array.clone() has a result that is
2616 // the same as static type of the array being cloned
2617 return qualifierType;
2618 } else {
2619 return restype;
2620 }
2621 }
2622
2623 /** Check that given application node appears as first statement
2624 * in a constructor call.
2625 * @param tree The application node
2626 * @param enclMethod The enclosing method of the application.
2627 * @param error Should an error be issued?
2628 */
2629 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2630 if (enclMethod != null && enclMethod.name == names.init) {
2631 JCBlock body = enclMethod.body;
2632 if (body.stats.head.hasTag(EXEC) &&
2633 ((JCExpressionStatement) body.stats.head).expr == tree)
2634 return true;
2635 }
2636 if (error) {
2637 log.error(tree.pos(),
2638 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2639 }
2640 return false;
2641 }
2642
2643 /** Obtain a method type with given argument types.
2644 */
2645 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2646 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2647 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2648 }
2649
2650 public void visitNewClass(final JCNewClass tree) {
2651 Type owntype = types.createErrorType(tree.type);
2652
2653 // The local environment of a class creation is
2654 // a new environment nested in the current one.
2655 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2656
2657 // The anonymous inner class definition of the new expression,
2658 // if one is defined by it.
2659 JCClassDecl cdef = tree.def;
2660
2661 // If enclosing class is given, attribute it, and
2662 // complete class name to be fully qualified
2663 JCExpression clazz = tree.clazz; // Class field following new
2664 JCExpression clazzid; // Identifier in class field
2665 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2666 annoclazzid = null;
2667
2668 if (clazz.hasTag(TYPEAPPLY)) {
2669 clazzid = ((JCTypeApply) clazz).clazz;
2670 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2671 annoclazzid = (JCAnnotatedType) clazzid;
2672 clazzid = annoclazzid.underlyingType;
2673 }
2674 } else {
2675 if (clazz.hasTag(ANNOTATED_TYPE)) {
2676 annoclazzid = (JCAnnotatedType) clazz;
2677 clazzid = annoclazzid.underlyingType;
2678 } else {
2679 clazzid = clazz;
2680 }
2681 }
2682
2683 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2684
2685 if (tree.encl != null) {
2686 // We are seeing a qualified new, of the form
2687 // <expr>.new C <...> (...) ...
2688 // In this case, we let clazz stand for the name of the
2689 // allocated class C prefixed with the type of the qualifier
2690 // expression, so that we can
2691 // resolve it with standard techniques later. I.e., if
2692 // <expr> has type T, then <expr>.new C <...> (...)
2693 // yields a clazz T.C.
2694 Type encltype = chk.checkRefType(tree.encl.pos(),
2695 attribExpr(tree.encl, env));
2696 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2697 // from expr to the combined type, or not? Yes, do this.
2698 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2699 ((JCIdent) clazzid).name);
2700
2701 EndPosTable endPosTable = this.env.toplevel.endPositions;
2702 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2703 if (clazz.hasTag(ANNOTATED_TYPE)) {
2704 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2705 List<JCAnnotation> annos = annoType.annotations;
2706
2707 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2708 clazzid1 = make.at(tree.pos).
2709 TypeApply(clazzid1,
2710 ((JCTypeApply) clazz).arguments);
2711 }
2712
2713 clazzid1 = make.at(tree.pos).
2714 AnnotatedType(annos, clazzid1);
2715 } else if (clazz.hasTag(TYPEAPPLY)) {
2716 clazzid1 = make.at(tree.pos).
2717 TypeApply(clazzid1,
2718 ((JCTypeApply) clazz).arguments);
2719 }
2720
2721 clazz = clazzid1;
2722 }
2723
2724 // Attribute clazz expression and store
2725 // symbol + type back into the attributed tree.
2726 Type clazztype;
2727
2728 try {
2729 env.info.isNewClass = true;
2730 clazztype = TreeInfo.isEnumInit(env.tree) ?
2731 attribIdentAsEnumType(env, (JCIdent)clazz) :
2732 attribType(clazz, env);
2733 } finally {
2734 env.info.isNewClass = false;
2735 }
2736
2737 clazztype = chk.checkDiamond(tree, clazztype);
2738 chk.validate(clazz, localEnv);
2739 if (tree.encl != null) {
2740 // We have to work in this case to store
2741 // symbol + type back into the attributed tree.
2742 tree.clazz.type = clazztype;
2743 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2744 clazzid.type = ((JCIdent) clazzid).sym.type;
2745 if (annoclazzid != null) {
2746 annoclazzid.type = clazzid.type;
2747 }
2748 if (!clazztype.isErroneous()) {
2749 if (cdef != null && clazztype.tsym.isInterface()) {
2750 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2751 } else if (clazztype.tsym.isStatic()) {
2752 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2753 }
2754 }
2755 } else if (!clazztype.tsym.isInterface() &&
2756 clazztype.getEnclosingType().hasTag(CLASS)) {
2757 // Check for the existence of an apropos outer instance
2758 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2759 }
2760
2761 // Attribute constructor arguments.
2762 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2763 final KindSelector pkind =
2764 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2765 List<Type> argtypes = argtypesBuf.toList();
2766 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2767
2768 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2769 // Enums may not be instantiated except implicitly
2770 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2771 (!env.tree.hasTag(VARDEF) ||
2772 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2773 ((JCVariableDecl) env.tree).init != tree))
2774 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2775
2776 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2777 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2778 boolean skipNonDiamondPath = false;
2779 // Check that class is not abstract
2780 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2781 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2782 log.error(tree.pos(),
2783 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2784 skipNonDiamondPath = true;
2785 } else if (cdef != null && clazztype.tsym.isInterface()) {
2786 // Check that no constructor arguments are given to
2787 // anonymous classes implementing an interface
2788 if (!argtypes.isEmpty())
2789 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2790
2791 if (!typeargtypes.isEmpty())
2792 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2793
2794 // Error recovery: pretend no arguments were supplied.
2795 argtypes = List.nil();
2796 typeargtypes = List.nil();
2797 skipNonDiamondPath = true;
2798 }
2799 if (TreeInfo.isDiamond(tree)) {
2800 ClassType site = new ClassType(clazztype.getEnclosingType(),
2801 clazztype.tsym.type.getTypeArguments(),
2802 clazztype.tsym,
2803 clazztype.getMetadata());
2804
2805 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2806 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2807 diamondEnv.info.pendingResolutionPhase = null;
2808
2809 //if the type of the instance creation expression is a class type
2810 //apply method resolution inference (JLS 15.12.2.7). The return type
2811 //of the resolved constructor will be a partially instantiated type
2812 Symbol constructor = rs.resolveDiamond(tree.pos(),
2813 diamondEnv,
2814 site,
2815 argtypes,
2816 typeargtypes);
2817 tree.constructor = constructor.baseSymbol();
2818
2819 final TypeSymbol csym = clazztype.tsym;
2820 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2821 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2822 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2823 constructorType = checkId(tree, site,
2824 constructor,
2825 diamondEnv,
2826 diamondResult);
2827
2828 tree.clazz.type = types.createErrorType(clazztype);
2829 if (!constructorType.isErroneous()) {
2830 tree.clazz.type = clazz.type = constructorType.getReturnType();
2831 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2832 }
2833 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2834 }
2835
2836 // Resolve the called constructor under the assumption
2837 // that we are referring to a superclass instance of the
2838 // current instance (JLS ???).
2839 else if (!skipNonDiamondPath) {
2840 //the following code alters some of the fields in the current
2841 //AttrContext - hence, the current context must be dup'ed in
2842 //order to avoid downstream failures
2843 Env<AttrContext> rsEnv = localEnv.dup(tree);
2844 rsEnv.info.selectSuper = cdef != null;
2845 rsEnv.info.pendingResolutionPhase = null;
2846 tree.constructor = rs.resolveConstructor(
2847 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2848 if (cdef == null) { //do not check twice!
2849 tree.constructorType = checkId(tree,
2850 clazztype,
2851 tree.constructor,
2852 rsEnv,
2853 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2854 if (rsEnv.info.lastResolveVarargs())
2855 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2856 }
2857 }
2858
2859 if (cdef != null) {
2860 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2861 return;
2862 }
2863
2864 if (tree.constructor != null && tree.constructor.kind == MTH)
2865 owntype = clazztype;
2866 }
2867 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2868 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2869 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2870 //we need to wait for inference to finish and then replace inference vars in the constructor type
2871 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2872 instantiatedContext -> {
2873 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2874 });
2875 }
2876 chk.validate(tree.typeargs, localEnv);
2877 }
2878
2879 // where
2880 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2881 JCClassDecl cdef, Env<AttrContext> localEnv,
2882 List<Type> argtypes, List<Type> typeargtypes,
2883 KindSelector pkind) {
2884 // We are seeing an anonymous class instance creation.
2885 // In this case, the class instance creation
2886 // expression
2887 //
2888 // E.new <typeargs1>C<typargs2>(args) { ... }
2889 //
2890 // is represented internally as
2891 //
2892 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2893 //
2894 // This expression is then *transformed* as follows:
2895 //
2896 // (1) add an extends or implements clause
2897 // (2) add a constructor.
2898 //
2899 // For instance, if C is a class, and ET is the type of E,
2900 // the expression
2901 //
2902 // E.new <typeargs1>C<typargs2>(args) { ... }
2903 //
2904 // is translated to (where X is a fresh name and typarams is the
2905 // parameter list of the super constructor):
2906 //
2907 // new <typeargs1>X(<*nullchk*>E, args) where
2908 // X extends C<typargs2> {
2909 // <typarams> X(ET e, args) {
2910 // e.<typeargs1>super(args)
2911 // }
2912 // ...
2913 // }
2914 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2915 Type enclType = clazztype.getEnclosingType();
2916 if (enclType != null &&
2917 enclType.hasTag(CLASS) &&
2918 !chk.checkDenotable((ClassType)enclType)) {
2919 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2920 }
2921 final boolean isDiamond = TreeInfo.isDiamond(tree);
2922 if (isDiamond
2923 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2924 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2925 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2926 Env<AttrContext> dupLocalEnv = localEnv.dup(localEnv.tree, localEnv.info.dup(localEnv.info.scope.dupUnshared()));
2927 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2928 instantiatedContext -> {
2929 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2930 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2931 ResultInfo prevResult = this.resultInfo;
2932 try {
2933 this.resultInfo = resultInfoForClassDefinition;
2934 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2935 dupLocalEnv, argtypes, typeargtypes, pkind);
2936 } finally {
2937 this.resultInfo = prevResult;
2938 }
2939 });
2940 } else {
2941 if (isDiamond && clazztype.hasTag(CLASS)) {
2942 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2943 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2944 // One or more types inferred in the previous steps is non-denotable.
2945 Fragment fragment = Diamond(clazztype.tsym);
2946 log.error(tree.clazz.pos(),
2947 Errors.CantApplyDiamond1(
2948 fragment,
2949 invalidDiamondArgs.size() > 1 ?
2950 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2951 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2952 }
2953 // For <>(){}, inferred types must also be accessible.
2954 for (Type t : clazztype.getTypeArguments()) {
2955 rs.checkAccessibleType(env, t);
2956 }
2957 }
2958
2959 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2960 // false for isInterface call even when the original type is an interface.
2961 boolean implementing = clazztype.tsym.isInterface() ||
2962 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2963 clazztype.getOriginalType().tsym.isInterface();
2964
2965 if (implementing) {
2966 cdef.implementing = List.of(clazz);
2967 } else {
2968 cdef.extending = clazz;
2969 }
2970
2971 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2972 rs.isSerializable(clazztype)) {
2973 localEnv.info.isSerializable = true;
2974 }
2975
2976 attribStat(cdef, localEnv);
2977
2978 List<Type> finalargtypes;
2979 // If an outer instance is given,
2980 // prefix it to the constructor arguments
2981 // and delete it from the new expression
2982 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2983 finalargtypes = argtypes.prepend(tree.encl.type);
2984 } else {
2985 finalargtypes = argtypes;
2986 }
2987
2988 // Reassign clazztype and recompute constructor. As this necessarily involves
2989 // another attribution pass for deferred types in the case of <>, replicate
2990 // them. Original arguments have right decorations already.
2991 if (isDiamond && pkind.contains(KindSelector.POLY)) {
2992 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
2993 }
2994
2995 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
2996 : cdef.sym.type;
2997 Symbol sym = tree.constructor = rs.resolveConstructor(
2998 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
2999 Assert.check(!sym.kind.isResolutionError());
3000 tree.constructor = sym;
3001 tree.constructorType = checkId(tree,
3002 clazztype,
3003 tree.constructor,
3004 localEnv,
3005 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3006 }
3007 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3008 clazztype : types.createErrorType(tree.type);
3009 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3010 chk.validate(tree.typeargs, localEnv);
3011 }
3012
3013 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3014 return new Check.NestedCheckContext(checkContext) {
3015 @Override
3016 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3017 enclosingContext.report(clazz.clazz,
3018 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3019 }
3020 };
3021 }
3022
3023 /** Make an attributed null check tree.
3024 */
3025 public JCExpression makeNullCheck(JCExpression arg) {
3026 // optimization: new Outer() can never be null; skip null check
3027 if (arg.getTag() == NEWCLASS)
3028 return arg;
3029 // optimization: X.this is never null; skip null check
3030 Name name = TreeInfo.name(arg);
3031 if (name == names._this || name == names._super) return arg;
3032
3033 JCTree.Tag optag = NULLCHK;
3034 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3035 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3036 tree.type = arg.type;
3037 return tree;
3038 }
3039
3040 public void visitNewArray(JCNewArray tree) {
3041 Type owntype = types.createErrorType(tree.type);
3042 Env<AttrContext> localEnv = env.dup(tree);
3043 Type elemtype;
3044 if (tree.elemtype != null) {
3045 elemtype = attribType(tree.elemtype, localEnv);
3046 chk.validate(tree.elemtype, localEnv);
3047 owntype = elemtype;
3048 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3049 attribExpr(l.head, localEnv, syms.intType);
3050 owntype = new ArrayType(owntype, syms.arrayClass);
3051 }
3052 } else {
3053 // we are seeing an untyped aggregate { ... }
3054 // this is allowed only if the prototype is an array
3055 if (pt().hasTag(ARRAY)) {
3056 elemtype = types.elemtype(pt());
3057 } else {
3058 if (!pt().hasTag(ERROR) &&
3059 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3060 log.error(tree.pos(),
3061 Errors.IllegalInitializerForType(pt()));
3062 }
3063 elemtype = types.createErrorType(pt());
3064 }
3065 }
3066 if (tree.elems != null) {
3067 attribExprs(tree.elems, localEnv, elemtype);
3068 owntype = new ArrayType(elemtype, syms.arrayClass);
3069 }
3070 if (!types.isReifiable(elemtype))
3071 log.error(tree.pos(), Errors.GenericArrayCreation);
3072 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3073 }
3074
3075 /*
3076 * A lambda expression can only be attributed when a target-type is available.
3077 * In addition, if the target-type is that of a functional interface whose
3078 * descriptor contains inference variables in argument position the lambda expression
3079 * is 'stuck' (see DeferredAttr).
3080 */
3081 @Override
3082 public void visitLambda(final JCLambda that) {
3083 boolean wrongContext = false;
3084 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3085 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3086 //lambda only allowed in assignment or method invocation/cast context
3087 log.error(that.pos(), Errors.UnexpectedLambda);
3088 }
3089 resultInfo = recoveryInfo;
3090 wrongContext = true;
3091 }
3092 //create an environment for attribution of the lambda expression
3093 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3094 boolean needsRecovery =
3095 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3096 try {
3097 if (needsRecovery && rs.isSerializable(pt())) {
3098 localEnv.info.isSerializable = true;
3099 localEnv.info.isSerializableLambda = true;
3100 }
3101 List<Type> explicitParamTypes = null;
3102 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3103 //attribute lambda parameters
3104 attribStats(that.params, localEnv);
3105 explicitParamTypes = TreeInfo.types(that.params);
3106 }
3107
3108 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3109 Type currentTarget = targetInfo.target;
3110 Type lambdaType = targetInfo.descriptor;
3111
3112 if (currentTarget.isErroneous()) {
3113 result = that.type = currentTarget;
3114 return;
3115 }
3116
3117 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3118
3119 if (lambdaType.hasTag(FORALL)) {
3120 //lambda expression target desc cannot be a generic method
3121 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3122 kindName(currentTarget.tsym),
3123 currentTarget.tsym);
3124 resultInfo.checkContext.report(that, diags.fragment(msg));
3125 result = that.type = types.createErrorType(pt());
3126 return;
3127 }
3128
3129 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3130 //add param type info in the AST
3131 List<Type> actuals = lambdaType.getParameterTypes();
3132 List<JCVariableDecl> params = that.params;
3133
3134 boolean arityMismatch = false;
3135
3136 while (params.nonEmpty()) {
3137 if (actuals.isEmpty()) {
3138 //not enough actuals to perform lambda parameter inference
3139 arityMismatch = true;
3140 }
3141 //reset previously set info
3142 Type argType = arityMismatch ?
3143 syms.errType :
3144 actuals.head;
3145 if (params.head.isImplicitlyTyped()) {
3146 setSyntheticVariableType(params.head, argType);
3147 }
3148 params.head.sym = null;
3149 actuals = actuals.isEmpty() ?
3150 actuals :
3151 actuals.tail;
3152 params = params.tail;
3153 }
3154
3155 //attribute lambda parameters
3156 attribStats(that.params, localEnv);
3157
3158 if (arityMismatch) {
3159 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3160 result = that.type = types.createErrorType(currentTarget);
3161 return;
3162 }
3163 }
3164
3165 //from this point on, no recovery is needed; if we are in assignment context
3166 //we will be able to attribute the whole lambda body, regardless of errors;
3167 //if we are in a 'check' method context, and the lambda is not compatible
3168 //with the target-type, it will be recovered anyway in Attr.checkId
3169 needsRecovery = false;
3170
3171 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3172 lambdaBodyResult(that, lambdaType, resultInfo);
3173
3174 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3175 attribTree(that.getBody(), localEnv, bodyResultInfo);
3176 } else {
3177 JCBlock body = (JCBlock)that.body;
3178 if (body == breakTree &&
3179 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3180 breakTreeFound(copyEnv(localEnv));
3181 }
3182 attribStats(body.stats, localEnv);
3183 }
3184
3185 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3186
3187 boolean isSpeculativeRound =
3188 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3189
3190 preFlow(that);
3191 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3192
3193 that.type = currentTarget; //avoids recovery at this stage
3194 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3195
3196 if (!isSpeculativeRound) {
3197 //add thrown types as bounds to the thrown types free variables if needed:
3198 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3199 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3200 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3201 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3202 }
3203 }
3204
3205 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3206 }
3207 result = wrongContext ? that.type = types.createErrorType(pt())
3208 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3209 } catch (Types.FunctionDescriptorLookupError ex) {
3210 JCDiagnostic cause = ex.getDiagnostic();
3211 resultInfo.checkContext.report(that, cause);
3212 result = that.type = types.createErrorType(pt());
3213 return;
3214 } catch (CompletionFailure cf) {
3215 chk.completionError(that.pos(), cf);
3216 } catch (Throwable t) {
3217 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3218 //as that would likely cause the same exception again.
3219 needsRecovery = false;
3220 throw t;
3221 } finally {
3222 localEnv.info.scope.leave();
3223 if (needsRecovery) {
3224 Type prevResult = result;
3225 try {
3226 attribTree(that, env, recoveryInfo);
3227 } finally {
3228 if (result == Type.recoveryType) {
3229 result = prevResult;
3230 }
3231 }
3232 }
3233 }
3234 }
3235 //where
3236 class TargetInfo {
3237 Type target;
3238 Type descriptor;
3239
3240 public TargetInfo(Type target, Type descriptor) {
3241 this.target = target;
3242 this.descriptor = descriptor;
3243 }
3244 }
3245
3246 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3247 Type lambdaType;
3248 Type currentTarget = resultInfo.pt;
3249 if (resultInfo.pt != Type.recoveryType) {
3250 /* We need to adjust the target. If the target is an
3251 * intersection type, for example: SAM & I1 & I2 ...
3252 * the target will be updated to SAM
3253 */
3254 currentTarget = targetChecker.visit(currentTarget, that);
3255 if (!currentTarget.isIntersection()) {
3256 if (explicitParamTypes != null) {
3257 currentTarget = infer.instantiateFunctionalInterface(that,
3258 currentTarget, explicitParamTypes, resultInfo.checkContext);
3259 }
3260 currentTarget = types.removeWildcards(currentTarget);
3261 lambdaType = types.findDescriptorType(currentTarget);
3262 } else {
3263 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3264 ListBuffer<Type> components = new ListBuffer<>();
3265 for (Type bound : ict.getExplicitComponents()) {
3266 if (explicitParamTypes != null) {
3267 try {
3268 bound = infer.instantiateFunctionalInterface(that,
3269 bound, explicitParamTypes, resultInfo.checkContext);
3270 } catch (FunctionDescriptorLookupError t) {
3271 // do nothing
3272 }
3273 }
3274 bound = types.removeWildcards(bound);
3275 components.add(bound);
3276 }
3277 currentTarget = types.makeIntersectionType(components.toList());
3278 currentTarget.tsym.flags_field |= INTERFACE;
3279 lambdaType = types.findDescriptorType(currentTarget);
3280 }
3281
3282 } else {
3283 currentTarget = Type.recoveryType;
3284 lambdaType = fallbackDescriptorType(that);
3285 }
3286 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3287 //lambda expression target desc cannot be a generic method
3288 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3289 kindName(currentTarget.tsym),
3290 currentTarget.tsym);
3291 resultInfo.checkContext.report(that, diags.fragment(msg));
3292 currentTarget = types.createErrorType(pt());
3293 }
3294 return new TargetInfo(currentTarget, lambdaType);
3295 }
3296
3297 void preFlow(JCLambda tree) {
3298 attrRecover.doRecovery();
3299 new PostAttrAnalyzer() {
3300 @Override
3301 public void scan(JCTree tree) {
3302 if (tree == null ||
3303 (tree.type != null &&
3304 tree.type == Type.stuckType)) {
3305 //don't touch stuck expressions!
3306 return;
3307 }
3308 super.scan(tree);
3309 }
3310
3311 @Override
3312 public void visitClassDef(JCClassDecl that) {
3313 // or class declaration trees!
3314 }
3315
3316 public void visitLambda(JCLambda that) {
3317 // or lambda expressions!
3318 }
3319 }.scan(tree.body);
3320 }
3321
3322 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3323
3324 @Override
3325 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3326 return t.isIntersection() ?
3327 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3328 }
3329
3330 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3331 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3332 return ict;
3333 }
3334
3335 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3336 ListBuffer<Type> targs = new ListBuffer<>();
3337 ListBuffer<Type> supertypes = new ListBuffer<>();
3338 for (Type i : ict.interfaces_field) {
3339 if (i.isParameterized()) {
3340 targs.appendList(i.tsym.type.allparams());
3341 }
3342 supertypes.append(i.tsym.type);
3343 }
3344 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3345 notionalIntf.allparams_field = targs.toList();
3346 notionalIntf.tsym.flags_field |= INTERFACE;
3347 return notionalIntf.tsym;
3348 }
3349 };
3350
3351 private Type fallbackDescriptorType(JCExpression tree) {
3352 switch (tree.getTag()) {
3353 case LAMBDA:
3354 JCLambda lambda = (JCLambda)tree;
3355 List<Type> argtypes = List.nil();
3356 for (JCVariableDecl param : lambda.params) {
3357 argtypes = param.vartype != null && param.vartype.type != null ?
3358 argtypes.append(param.vartype.type) :
3359 argtypes.append(syms.errType);
3360 }
3361 return new MethodType(argtypes, Type.recoveryType,
3362 List.of(syms.throwableType), syms.methodClass);
3363 case REFERENCE:
3364 return new MethodType(List.nil(), Type.recoveryType,
3365 List.of(syms.throwableType), syms.methodClass);
3366 default:
3367 Assert.error("Cannot get here!");
3368 }
3369 return null;
3370 }
3371
3372 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3373 final InferenceContext inferenceContext, final Type... ts) {
3374 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3375 }
3376
3377 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3378 final InferenceContext inferenceContext, final List<Type> ts) {
3379 if (inferenceContext.free(ts)) {
3380 inferenceContext.addFreeTypeListener(ts,
3381 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3382 } else {
3383 for (Type t : ts) {
3384 rs.checkAccessibleType(env, t);
3385 }
3386 }
3387 }
3388
3389 /**
3390 * Lambda/method reference have a special check context that ensures
3391 * that i.e. a lambda return type is compatible with the expected
3392 * type according to both the inherited context and the assignment
3393 * context.
3394 */
3395 class FunctionalReturnContext extends Check.NestedCheckContext {
3396
3397 FunctionalReturnContext(CheckContext enclosingContext) {
3398 super(enclosingContext);
3399 }
3400
3401 @Override
3402 public boolean compatible(Type found, Type req, Warner warn) {
3403 //return type must be compatible in both current context and assignment context
3404 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3405 }
3406
3407 @Override
3408 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3409 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3410 }
3411 }
3412
3413 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3414
3415 JCExpression expr;
3416 boolean expStmtExpected;
3417
3418 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3419 super(enclosingContext);
3420 this.expr = expr;
3421 }
3422
3423 @Override
3424 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3425 if (expStmtExpected) {
3426 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3427 } else {
3428 super.report(pos, details);
3429 }
3430 }
3431
3432 @Override
3433 public boolean compatible(Type found, Type req, Warner warn) {
3434 //a void return is compatible with an expression statement lambda
3435 if (req.hasTag(VOID)) {
3436 expStmtExpected = true;
3437 return TreeInfo.isExpressionStatement(expr);
3438 } else {
3439 return super.compatible(found, req, warn);
3440 }
3441 }
3442 }
3443
3444 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3445 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3446 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3447 new FunctionalReturnContext(resultInfo.checkContext);
3448
3449 return descriptor.getReturnType() == Type.recoveryType ?
3450 recoveryInfo :
3451 new ResultInfo(KindSelector.VAL,
3452 descriptor.getReturnType(), funcContext);
3453 }
3454
3455 /**
3456 * Lambda compatibility. Check that given return types, thrown types, parameter types
3457 * are compatible with the expected functional interface descriptor. This means that:
3458 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3459 * types must be compatible with the return type of the expected descriptor.
3460 */
3461 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3462 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3463
3464 //return values have already been checked - but if lambda has no return
3465 //values, we must ensure that void/value compatibility is correct;
3466 //this amounts at checking that, if a lambda body can complete normally,
3467 //the descriptor's return type must be void
3468 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3469 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3470 Fragment msg =
3471 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3472 checkContext.report(tree,
3473 diags.fragment(msg));
3474 }
3475
3476 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3477 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3478 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3479 }
3480 }
3481
3482 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3483 * static field and that lambda has type annotations, these annotations will
3484 * also be stored at these fake clinit methods.
3485 *
3486 * LambdaToMethod also use fake clinit methods so they can be reused.
3487 * Also as LTM is a phase subsequent to attribution, the methods from
3488 * clinits can be safely removed by LTM to save memory.
3489 */
3490 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3491
3492 public MethodSymbol removeClinit(ClassSymbol sym) {
3493 return clinits.remove(sym);
3494 }
3495
3496 /* This method returns an environment to be used to attribute a lambda
3497 * expression.
3498 *
3499 * The owner of this environment is a method symbol. If the current owner
3500 * is not a method, for example if the lambda is used to initialize
3501 * a field, then if the field is:
3502 *
3503 * - an instance field, we use the first constructor.
3504 * - a static field, we create a fake clinit method.
3505 */
3506 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3507 Env<AttrContext> lambdaEnv;
3508 Symbol owner = env.info.scope.owner;
3509 if (owner.kind == VAR && owner.owner.kind == TYP) {
3510 //field initializer
3511 ClassSymbol enclClass = owner.enclClass();
3512 Symbol newScopeOwner = env.info.scope.owner;
3513 /* if the field isn't static, then we can get the first constructor
3514 * and use it as the owner of the environment. This is what
3515 * LTM code is doing to look for type annotations so we are fine.
3516 */
3517 if ((owner.flags() & STATIC) == 0) {
3518 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3519 newScopeOwner = s;
3520 break;
3521 }
3522 } else {
3523 /* if the field is static then we need to create a fake clinit
3524 * method, this method can later be reused by LTM.
3525 */
3526 MethodSymbol clinit = clinits.get(enclClass);
3527 if (clinit == null) {
3528 Type clinitType = new MethodType(List.nil(),
3529 syms.voidType, List.nil(), syms.methodClass);
3530 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3531 names.clinit, clinitType, enclClass);
3532 clinit.params = List.nil();
3533 clinits.put(enclClass, clinit);
3534 }
3535 newScopeOwner = clinit;
3536 }
3537 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3538 } else {
3539 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3540 }
3541 lambdaEnv.info.yieldResult = null;
3542 lambdaEnv.info.isLambda = true;
3543 return lambdaEnv;
3544 }
3545
3546 @Override
3547 public void visitReference(final JCMemberReference that) {
3548 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3549 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3550 //method reference only allowed in assignment or method invocation/cast context
3551 log.error(that.pos(), Errors.UnexpectedMref);
3552 }
3553 result = that.type = types.createErrorType(pt());
3554 return;
3555 }
3556 final Env<AttrContext> localEnv = env.dup(that);
3557 try {
3558 //attribute member reference qualifier - if this is a constructor
3559 //reference, the expected kind must be a type
3560 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3561
3562 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3563 exprType = chk.checkConstructorRefType(that.expr, exprType);
3564 if (!exprType.isErroneous() &&
3565 exprType.isRaw() &&
3566 that.typeargs != null) {
3567 log.error(that.expr.pos(),
3568 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3569 Fragments.MrefInferAndExplicitParams));
3570 exprType = types.createErrorType(exprType);
3571 }
3572 }
3573
3574 if (exprType.isErroneous()) {
3575 //if the qualifier expression contains problems,
3576 //give up attribution of method reference
3577 result = that.type = exprType;
3578 return;
3579 }
3580
3581 if (TreeInfo.isStaticSelector(that.expr, names)) {
3582 //if the qualifier is a type, validate it; raw warning check is
3583 //omitted as we don't know at this stage as to whether this is a
3584 //raw selector (because of inference)
3585 chk.validate(that.expr, env, false);
3586 } else {
3587 Symbol lhsSym = TreeInfo.symbol(that.expr);
3588 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3589 }
3590 //attrib type-arguments
3591 List<Type> typeargtypes = List.nil();
3592 if (that.typeargs != null) {
3593 typeargtypes = attribTypes(that.typeargs, localEnv);
3594 }
3595
3596 boolean isTargetSerializable =
3597 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3598 rs.isSerializable(pt());
3599 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3600 Type currentTarget = targetInfo.target;
3601 Type desc = targetInfo.descriptor;
3602
3603 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3604 List<Type> argtypes = desc.getParameterTypes();
3605 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3606
3607 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3608 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3609 }
3610
3611 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3612 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3613 try {
3614 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3615 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3616 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3617 } finally {
3618 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3619 }
3620
3621 Symbol refSym = refResult.fst;
3622 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3623
3624 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3625 * JDK-8075541
3626 */
3627 if (refSym.kind != MTH) {
3628 boolean targetError;
3629 switch (refSym.kind) {
3630 case ABSENT_MTH:
3631 case MISSING_ENCL:
3632 targetError = false;
3633 break;
3634 case WRONG_MTH:
3635 case WRONG_MTHS:
3636 case AMBIGUOUS:
3637 case HIDDEN:
3638 case STATICERR:
3639 targetError = true;
3640 break;
3641 default:
3642 Assert.error("unexpected result kind " + refSym.kind);
3643 targetError = false;
3644 }
3645
3646 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3647 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3648 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3649
3650 JCDiagnostic diag = diags.create(log.currentSource(), that,
3651 targetError ?
3652 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3653 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3654
3655 if (targetError && currentTarget == Type.recoveryType) {
3656 //a target error doesn't make sense during recovery stage
3657 //as we don't know what actual parameter types are
3658 result = that.type = currentTarget;
3659 return;
3660 } else {
3661 if (targetError) {
3662 resultInfo.checkContext.report(that, diag);
3663 } else {
3664 log.report(diag);
3665 }
3666 result = that.type = types.createErrorType(currentTarget);
3667 return;
3668 }
3669 }
3670
3671 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3672 that.kind = lookupHelper.referenceKind(that.sym);
3673 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3674
3675 if (desc.getReturnType() == Type.recoveryType) {
3676 // stop here
3677 result = that.type = currentTarget;
3678 return;
3679 }
3680
3681 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3682 Type enclosingType = exprType.getEnclosingType();
3683 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3684 // Check for the existence of an appropriate outer instance
3685 rs.resolveImplicitThis(that.pos(), env, exprType);
3686 }
3687 }
3688
3689 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3690
3691 if (that.getMode() == ReferenceMode.INVOKE &&
3692 TreeInfo.isStaticSelector(that.expr, names) &&
3693 that.kind.isUnbound() &&
3694 lookupHelper.site.isRaw()) {
3695 chk.checkRaw(that.expr, localEnv);
3696 }
3697
3698 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3699 exprType.getTypeArguments().nonEmpty()) {
3700 //static ref with class type-args
3701 log.error(that.expr.pos(),
3702 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3703 Fragments.StaticMrefWithTargs));
3704 result = that.type = types.createErrorType(currentTarget);
3705 return;
3706 }
3707
3708 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3709 // Check that super-qualified symbols are not abstract (JLS)
3710 rs.checkNonAbstract(that.pos(), that.sym);
3711 }
3712
3713 if (isTargetSerializable) {
3714 chk.checkAccessFromSerializableElement(that, true);
3715 }
3716 }
3717
3718 ResultInfo checkInfo =
3719 resultInfo.dup(newMethodTemplate(
3720 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3721 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3722 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3723
3724 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3725
3726 if (that.kind.isUnbound() &&
3727 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3728 //re-generate inference constraints for unbound receiver
3729 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3730 //cannot happen as this has already been checked - we just need
3731 //to regenerate the inference constraints, as that has been lost
3732 //as a result of the call to inferenceContext.save()
3733 Assert.error("Can't get here");
3734 }
3735 }
3736
3737 if (!refType.isErroneous()) {
3738 refType = types.createMethodTypeWithReturn(refType,
3739 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3740 }
3741
3742 //go ahead with standard method reference compatibility check - note that param check
3743 //is a no-op (as this has been taken care during method applicability)
3744 boolean isSpeculativeRound =
3745 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3746
3747 that.type = currentTarget; //avoids recovery at this stage
3748 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3749 if (!isSpeculativeRound) {
3750 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3751 }
3752 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3753 } catch (Types.FunctionDescriptorLookupError ex) {
3754 JCDiagnostic cause = ex.getDiagnostic();
3755 resultInfo.checkContext.report(that, cause);
3756 result = that.type = types.createErrorType(pt());
3757 return;
3758 }
3759 }
3760 //where
3761 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3762 //if this is a constructor reference, the expected kind must be a type
3763 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3764 KindSelector.VAL_TYP : KindSelector.TYP,
3765 Type.noType);
3766 }
3767
3768
3769 @SuppressWarnings("fallthrough")
3770 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3771 InferenceContext inferenceContext = checkContext.inferenceContext();
3772 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3773
3774 Type resType;
3775 switch (tree.getMode()) {
3776 case NEW:
3777 if (!tree.expr.type.isRaw()) {
3778 resType = tree.expr.type;
3779 break;
3780 }
3781 default:
3782 resType = refType.getReturnType();
3783 }
3784
3785 Type incompatibleReturnType = resType;
3786
3787 if (returnType.hasTag(VOID)) {
3788 incompatibleReturnType = null;
3789 }
3790
3791 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3792 if (resType.isErroneous() ||
3793 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3794 checkContext.checkWarner(tree, resType, returnType))) {
3795 incompatibleReturnType = null;
3796 }
3797 }
3798
3799 if (incompatibleReturnType != null) {
3800 Fragment msg =
3801 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3802 checkContext.report(tree, diags.fragment(msg));
3803 } else {
3804 if (inferenceContext.free(refType)) {
3805 // we need to wait for inference to finish and then replace inference vars in the referent type
3806 inferenceContext.addFreeTypeListener(List.of(refType),
3807 instantiatedContext -> {
3808 tree.referentType = instantiatedContext.asInstType(refType);
3809 });
3810 } else {
3811 tree.referentType = refType;
3812 }
3813 }
3814
3815 if (!speculativeAttr) {
3816 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3817 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3818 }
3819 }
3820 }
3821
3822 boolean checkExConstraints(
3823 List<Type> thrownByFuncExpr,
3824 List<Type> thrownAtFuncType,
3825 InferenceContext inferenceContext) {
3826 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3827 * are not proper types
3828 */
3829 List<Type> nonProperList = thrownAtFuncType.stream()
3830 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3831 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3832
3833 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3834 * in the throws clause of the invocation type of the method reference's compile-time
3835 * declaration
3836 */
3837 List<Type> checkedList = thrownByFuncExpr.stream()
3838 .filter(e -> chk.isChecked(e)).collect(List.collector());
3839
3840 /** If n = 0 (the function type's throws clause consists only of proper types), then
3841 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3842 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3843 * reduces to true
3844 */
3845 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3846 for (Type checked : checkedList) {
3847 boolean isSubtype = false;
3848 for (Type proper : properList) {
3849 if (types.isSubtype(checked, proper)) {
3850 isSubtype = true;
3851 break;
3852 }
3853 }
3854 if (!isSubtype) {
3855 uncaughtByProperTypes.add(checked);
3856 }
3857 }
3858
3859 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3860 return false;
3861 }
3862
3863 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3864 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3865 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3866 */
3867 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3868 uncaughtByProperTypes.forEach(checkedEx -> {
3869 nonProperAsUndet.forEach(nonProper -> {
3870 types.isSubtype(checkedEx, nonProper);
3871 });
3872 });
3873
3874 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3875 */
3876 nonProperAsUndet.stream()
3877 .filter(t -> t.hasTag(UNDETVAR))
3878 .forEach(t -> ((UndetVar)t).setThrow());
3879 return true;
3880 }
3881
3882 /**
3883 * Set functional type info on the underlying AST. Note: as the target descriptor
3884 * might contain inference variables, we might need to register an hook in the
3885 * current inference context.
3886 */
3887 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3888 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3889 if (checkContext.inferenceContext().free(descriptorType)) {
3890 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3891 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3892 inferenceContext.asInstType(primaryTarget), checkContext));
3893 } else {
3894 if (pt.hasTag(CLASS)) {
3895 fExpr.target = primaryTarget;
3896 }
3897 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3898 pt != Type.recoveryType) {
3899 //check that functional interface class is well-formed
3900 try {
3901 /* Types.makeFunctionalInterfaceClass() may throw an exception
3902 * when it's executed post-inference. See the listener code
3903 * above.
3904 */
3905 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3906 names.empty, fExpr.target, ABSTRACT);
3907 if (csym != null) {
3908 chk.checkImplementations(env.tree, csym, csym);
3909 try {
3910 //perform an additional functional interface check on the synthetic class,
3911 //as there may be spurious errors for raw targets - because of existing issues
3912 //with membership and inheritance (see JDK-8074570).
3913 csym.flags_field |= INTERFACE;
3914 types.findDescriptorType(csym.type);
3915 } catch (FunctionDescriptorLookupError err) {
3916 resultInfo.checkContext.report(fExpr,
3917 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3918 }
3919 }
3920 } catch (Types.FunctionDescriptorLookupError ex) {
3921 JCDiagnostic cause = ex.getDiagnostic();
3922 resultInfo.checkContext.report(env.tree, cause);
3923 }
3924 }
3925 }
3926 }
3927
3928 public void visitParens(JCParens tree) {
3929 Type owntype = attribTree(tree.expr, env, resultInfo);
3930 result = check(tree, owntype, pkind(), resultInfo);
3931 Symbol sym = TreeInfo.symbol(tree);
3932 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3933 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3934 }
3935
3936 public void visitAssign(JCAssign tree) {
3937 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3938 Type capturedType = capture(owntype);
3939 attribExpr(tree.rhs, env, owntype);
3940 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3941 }
3942
3943 public void visitAssignop(JCAssignOp tree) {
3944 // Attribute arguments.
3945 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3946 Type operand = attribExpr(tree.rhs, env);
3947 // Find operator.
3948 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3949 if (operator != operators.noOpSymbol &&
3950 !owntype.isErroneous() &&
3951 !operand.isErroneous()) {
3952 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3953 chk.checkCastable(tree.rhs.pos(),
3954 operator.type.getReturnType(),
3955 owntype);
3956 }
3957 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3958 }
3959
3960 public void visitUnary(JCUnary tree) {
3961 // Attribute arguments.
3962 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3963 ? attribTree(tree.arg, env, varAssignmentInfo)
3964 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3965
3966 // Find operator.
3967 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3968 Type owntype = types.createErrorType(tree.type);
3969 if (operator != operators.noOpSymbol &&
3970 !argtype.isErroneous()) {
3971 owntype = (tree.getTag().isIncOrDecUnaryOp())
3972 ? tree.arg.type
3973 : operator.type.getReturnType();
3974 int opc = operator.opcode;
3975
3976 // If the argument is constant, fold it.
3977 if (argtype.constValue() != null) {
3978 Type ctype = cfolder.fold1(opc, argtype);
3979 if (ctype != null) {
3980 owntype = cfolder.coerce(ctype, owntype);
3981 }
3982 }
3983 }
3984 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3985 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
3986 }
3987
3988 public void visitBinary(JCBinary tree) {
3989 // Attribute arguments.
3990 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3991 // x && y
3992 // include x's bindings when true in y
3993
3994 // x || y
3995 // include x's bindings when false in y
3996
3997 MatchBindings lhsBindings = matchBindings;
3998 List<BindingSymbol> propagatedBindings;
3999 switch (tree.getTag()) {
4000 case AND:
4001 propagatedBindings = lhsBindings.bindingsWhenTrue;
4002 break;
4003 case OR:
4004 propagatedBindings = lhsBindings.bindingsWhenFalse;
4005 break;
4006 default:
4007 propagatedBindings = List.nil();
4008 break;
4009 }
4010 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4011 Type right;
4012 try {
4013 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4014 } finally {
4015 rhsEnv.info.scope.leave();
4016 }
4017
4018 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4019
4020 // Find operator.
4021 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4022 Type owntype = types.createErrorType(tree.type);
4023 if (operator != operators.noOpSymbol &&
4024 !left.isErroneous() &&
4025 !right.isErroneous()) {
4026 owntype = operator.type.getReturnType();
4027 int opc = operator.opcode;
4028 // If both arguments are constants, fold them.
4029 if (left.constValue() != null && right.constValue() != null) {
4030 Type ctype = cfolder.fold2(opc, left, right);
4031 if (ctype != null) {
4032 owntype = cfolder.coerce(ctype, owntype);
4033 }
4034 }
4035
4036 // Check that argument types of a reference ==, != are
4037 // castable to each other, (JLS 15.21). Note: unboxing
4038 // comparisons will not have an acmp* opc at this point.
4039 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4040 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4041 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4042 }
4043 }
4044
4045 chk.checkDivZero(tree.rhs.pos(), operator, right);
4046 }
4047 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4048 }
4049
4050 public void visitTypeCast(final JCTypeCast tree) {
4051 Type clazztype = attribType(tree.clazz, env);
4052 chk.validate(tree.clazz, env, false);
4053 //a fresh environment is required for 292 inference to work properly ---
4054 //see Infer.instantiatePolymorphicSignatureInstance()
4055 Env<AttrContext> localEnv = env.dup(tree);
4056 //should we propagate the target type?
4057 final ResultInfo castInfo;
4058 JCExpression expr = TreeInfo.skipParens(tree.expr);
4059 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4060 if (isPoly) {
4061 //expression is a poly - we need to propagate target type info
4062 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4063 new Check.NestedCheckContext(resultInfo.checkContext) {
4064 @Override
4065 public boolean compatible(Type found, Type req, Warner warn) {
4066 return types.isCastable(found, req, warn);
4067 }
4068 });
4069 } else {
4070 //standalone cast - target-type info is not propagated
4071 castInfo = unknownExprInfo;
4072 }
4073 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4074 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4075 if (exprtype.constValue() != null)
4076 owntype = cfolder.coerce(exprtype, owntype);
4077 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4078 if (!isPoly)
4079 chk.checkRedundantCast(localEnv, tree);
4080 }
4081
4082 public void visitTypeTest(JCInstanceOf tree) {
4083 Type exprtype = chk.checkNullOrRefType(
4084 tree.expr.pos(), attribExpr(tree.expr, env));
4085 Type clazztype;
4086 JCTree typeTree;
4087 if (tree.pattern.getTag() == BINDINGPATTERN ||
4088 tree.pattern.getTag() == PARENTHESIZEDPATTERN) {
4089 attribTree(tree.pattern, env, unknownExprInfo);
4090 clazztype = tree.pattern.type;
4091 if (types.isSubtype(exprtype, clazztype) &&
4092 !exprtype.isErroneous() && !clazztype.isErroneous()) {
4093 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4094 }
4095 typeTree = TreeInfo.primaryPatternTree((JCPattern) tree.pattern).var.vartype;
4096 } else {
4097 clazztype = attribType(tree.pattern, env);
4098 typeTree = tree.pattern;
4099 chk.validate(typeTree, env, false);
4100 }
4101 if (!clazztype.hasTag(TYPEVAR)) {
4102 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4103 }
4104 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4105 boolean valid = false;
4106 if (allowReifiableTypesInInstanceof) {
4107 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4108 } else {
4109 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4110 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4111 allowReifiableTypesInInstanceof = true;
4112 }
4113 if (!valid) {
4114 clazztype = types.createErrorType(clazztype);
4115 }
4116 }
4117 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4118 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4119 }
4120
4121 private boolean checkCastablePattern(DiagnosticPosition pos,
4122 Type exprType,
4123 Type pattType) {
4124 Warner warner = new Warner();
4125 if (!types.isCastable(exprType, pattType, warner)) {
4126 chk.basicHandler.report(pos,
4127 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4128 return false;
4129 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4130 log.error(pos,
4131 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4132 return false;
4133 } else {
4134 return true;
4135 }
4136 }
4137
4138 public void visitBindingPattern(JCBindingPattern tree) {
4139 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
4140 tree.type = tree.var.type = attribTree(tree.var.vartype, env, varInfo);
4141 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, tree.var.vartype.type, env.info.scope.owner);
4142 v.pos = tree.pos;
4143 tree.var.sym = v;
4144 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4145 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4146 }
4147 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4148 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4149 annotate.flush();
4150 chk.validate(tree.var.vartype, env, true);
4151 result = tree.type;
4152 matchBindings = new MatchBindings(List.of(v), List.nil());
4153 }
4154
4155 @Override
4156 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4157 attribExpr(tree.pattern, env);
4158 result = tree.type = tree.pattern.type;
4159 }
4160
4161 @Override
4162 public void visitGuardPattern(JCGuardPattern tree) {
4163 attribExpr(tree.patt, env);
4164 MatchBindings afterPattern = matchBindings;
4165 Env<AttrContext> bodyEnv = bindingEnv(env, matchBindings.bindingsWhenTrue);
4166 try {
4167 attribExpr(tree.expr, bodyEnv, syms.booleanType);
4168 } finally {
4169 bodyEnv.info.scope.leave();
4170 }
4171 result = tree.type = tree.patt.type;
4172 matchBindings = matchBindingsComputer.guardedPattern(tree, afterPattern, matchBindings);
4173 }
4174
4175 public void visitIndexed(JCArrayAccess tree) {
4176 Type owntype = types.createErrorType(tree.type);
4177 Type atype = attribExpr(tree.indexed, env);
4178 attribExpr(tree.index, env, syms.intType);
4179 if (types.isArray(atype))
4180 owntype = types.elemtype(atype);
4181 else if (!atype.hasTag(ERROR))
4182 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4183 if (!pkind().contains(KindSelector.VAL))
4184 owntype = capture(owntype);
4185 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4186 }
4187
4188 public void visitIdent(JCIdent tree) {
4189 Symbol sym;
4190
4191 // Find symbol
4192 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4193 // If we are looking for a method, the prototype `pt' will be a
4194 // method type with the type of the call's arguments as parameters.
4195 env.info.pendingResolutionPhase = null;
4196 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4197 } else if (tree.sym != null && tree.sym.kind != VAR) {
4198 sym = tree.sym;
4199 } else {
4200 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4201 }
4202 tree.sym = sym;
4203
4204 // Also find the environment current for the class where
4205 // sym is defined (`symEnv').
4206 Env<AttrContext> symEnv = env;
4207 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4208 sym.kind.matches(KindSelector.VAL_MTH) &&
4209 sym.owner.kind == TYP &&
4210 tree.name != names._this && tree.name != names._super) {
4211
4212 // Find environment in which identifier is defined.
4213 while (symEnv.outer != null &&
4214 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4215 symEnv = symEnv.outer;
4216 }
4217 }
4218
4219 // If symbol is a variable, ...
4220 if (sym.kind == VAR) {
4221 VarSymbol v = (VarSymbol)sym;
4222
4223 // ..., evaluate its initializer, if it has one, and check for
4224 // illegal forward reference.
4225 checkInit(tree, env, v, false);
4226
4227 // If we are expecting a variable (as opposed to a value), check
4228 // that the variable is assignable in the current environment.
4229 if (KindSelector.ASG.subset(pkind()))
4230 checkAssignable(tree.pos(), v, null, env);
4231 }
4232
4233 // In a constructor body,
4234 // if symbol is a field or instance method, check that it is
4235 // not accessed before the supertype constructor is called.
4236 if (symEnv.info.isSelfCall &&
4237 sym.kind.matches(KindSelector.VAL_MTH) &&
4238 sym.owner.kind == TYP &&
4239 (sym.flags() & STATIC) == 0) {
4240 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4241 sym : thisSym(tree.pos(), env));
4242 }
4243 Env<AttrContext> env1 = env;
4244 if (sym.kind != ERR && sym.kind != TYP &&
4245 sym.owner != null && sym.owner != env1.enclClass.sym) {
4246 // If the found symbol is inaccessible, then it is
4247 // accessed through an enclosing instance. Locate this
4248 // enclosing instance:
4249 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4250 env1 = env1.outer;
4251 }
4252
4253 if (env.info.isSerializable) {
4254 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4255 }
4256
4257 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4258 }
4259
4260 public void visitSelect(JCFieldAccess tree) {
4261 // Determine the expected kind of the qualifier expression.
4262 KindSelector skind = KindSelector.NIL;
4263 if (tree.name == names._this || tree.name == names._super ||
4264 tree.name == names._class)
4265 {
4266 skind = KindSelector.TYP;
4267 } else {
4268 if (pkind().contains(KindSelector.PCK))
4269 skind = KindSelector.of(skind, KindSelector.PCK);
4270 if (pkind().contains(KindSelector.TYP))
4271 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4272 if (pkind().contains(KindSelector.VAL_MTH))
4273 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4274 }
4275
4276 // Attribute the qualifier expression, and determine its symbol (if any).
4277 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4278 if (!pkind().contains(KindSelector.TYP_PCK))
4279 site = capture(site); // Capture field access
4280
4281 // don't allow T.class T[].class, etc
4282 if (skind == KindSelector.TYP) {
4283 Type elt = site;
4284 while (elt.hasTag(ARRAY))
4285 elt = ((ArrayType)elt).elemtype;
4286 if (elt.hasTag(TYPEVAR)) {
4287 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4288 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4289 tree.sym = tree.type.tsym;
4290 return ;
4291 }
4292 }
4293
4294 // If qualifier symbol is a type or `super', assert `selectSuper'
4295 // for the selection. This is relevant for determining whether
4296 // protected symbols are accessible.
4297 Symbol sitesym = TreeInfo.symbol(tree.selected);
4298 boolean selectSuperPrev = env.info.selectSuper;
4299 env.info.selectSuper =
4300 sitesym != null &&
4301 sitesym.name == names._super;
4302
4303 // Determine the symbol represented by the selection.
4304 env.info.pendingResolutionPhase = null;
4305 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4306 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4307 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4308 sym = syms.errSymbol;
4309 }
4310 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4311 site = capture(site);
4312 sym = selectSym(tree, sitesym, site, env, resultInfo);
4313 }
4314 boolean varArgs = env.info.lastResolveVarargs();
4315 tree.sym = sym;
4316
4317 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4318 site = types.skipTypeVars(site, true);
4319 }
4320
4321 // If that symbol is a variable, ...
4322 if (sym.kind == VAR) {
4323 VarSymbol v = (VarSymbol)sym;
4324
4325 // ..., evaluate its initializer, if it has one, and check for
4326 // illegal forward reference.
4327 checkInit(tree, env, v, true);
4328
4329 // If we are expecting a variable (as opposed to a value), check
4330 // that the variable is assignable in the current environment.
4331 if (KindSelector.ASG.subset(pkind()))
4332 checkAssignable(tree.pos(), v, tree.selected, env);
4333 }
4334
4335 if (sitesym != null &&
4336 sitesym.kind == VAR &&
4337 ((VarSymbol)sitesym).isResourceVariable() &&
4338 sym.kind == MTH &&
4339 sym.name.equals(names.close) &&
4340 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4341 env.info.lint.isEnabled(LintCategory.TRY)) {
4342 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4343 }
4344
4345 // Disallow selecting a type from an expression
4346 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4347 tree.type = check(tree.selected, pt(),
4348 sitesym == null ?
4349 KindSelector.VAL : sitesym.kind.toSelector(),
4350 new ResultInfo(KindSelector.TYP_PCK, pt()));
4351 }
4352
4353 if (isType(sitesym)) {
4354 if (sym.name == names._this || sym.name == names._super) {
4355 // If `C' is the currently compiled class, check that
4356 // `C.this' does not appear in an explicit call to a constructor
4357 // also make sure that `super` is not used in constructor invocations
4358 if (env.info.isSelfCall &&
4359 ((sym.name == names._this &&
4360 site.tsym == env.enclClass.sym) ||
4361 sym.name == names._super && env.info.constructorArgs &&
4362 (sitesym.isInterface() || site.tsym == env.enclClass.sym))) {
4363 chk.earlyRefError(tree.pos(), sym);
4364 }
4365 } else {
4366 // Check if type-qualified fields or methods are static (JLS)
4367 if ((sym.flags() & STATIC) == 0 &&
4368 sym.name != names._super &&
4369 (sym.kind == VAR || sym.kind == MTH)) {
4370 rs.accessBase(rs.new StaticError(sym),
4371 tree.pos(), site, sym.name, true);
4372 }
4373 }
4374 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
4375 sym.isStatic() && sym.kind == MTH) {
4376 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
4377 }
4378 } else if (sym.kind != ERR &&
4379 (sym.flags() & STATIC) != 0 &&
4380 sym.name != names._class) {
4381 // If the qualified item is not a type and the selected item is static, report
4382 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4383 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4384 }
4385
4386 // If we are selecting an instance member via a `super', ...
4387 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4388
4389 // Check that super-qualified symbols are not abstract (JLS)
4390 rs.checkNonAbstract(tree.pos(), sym);
4391
4392 if (site.isRaw()) {
4393 // Determine argument types for site.
4394 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4395 if (site1 != null) site = site1;
4396 }
4397 }
4398
4399 if (env.info.isSerializable) {
4400 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4401 }
4402
4403 env.info.selectSuper = selectSuperPrev;
4404 result = checkId(tree, site, sym, env, resultInfo);
4405 }
4406 //where
4407 /** Determine symbol referenced by a Select expression,
4408 *
4409 * @param tree The select tree.
4410 * @param site The type of the selected expression,
4411 * @param env The current environment.
4412 * @param resultInfo The current result.
4413 */
4414 private Symbol selectSym(JCFieldAccess tree,
4415 Symbol location,
4416 Type site,
4417 Env<AttrContext> env,
4418 ResultInfo resultInfo) {
4419 DiagnosticPosition pos = tree.pos();
4420 Name name = tree.name;
4421 switch (site.getTag()) {
4422 case PACKAGE:
4423 return rs.accessBase(
4424 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4425 pos, location, site, name, true);
4426 case ARRAY:
4427 case CLASS:
4428 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4429 return rs.resolveQualifiedMethod(
4430 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4431 } else if (name == names._this || name == names._super) {
4432 return rs.resolveSelf(pos, env, site.tsym, name);
4433 } else if (name == names._class) {
4434 // In this case, we have already made sure in
4435 // visitSelect that qualifier expression is a type.
4436 return syms.getClassField(site, types);
4437 } else {
4438 // We are seeing a plain identifier as selector.
4439 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4440 sym = rs.accessBase(sym, pos, location, site, name, true);
4441 return sym;
4442 }
4443 case WILDCARD:
4444 throw new AssertionError(tree);
4445 case TYPEVAR:
4446 // Normally, site.getUpperBound() shouldn't be null.
4447 // It should only happen during memberEnter/attribBase
4448 // when determining the super type which *must* be
4449 // done before attributing the type variables. In
4450 // other words, we are seeing this illegal program:
4451 // class B<T> extends A<T.foo> {}
4452 Symbol sym = (site.getUpperBound() != null)
4453 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4454 : null;
4455 if (sym == null) {
4456 log.error(pos, Errors.TypeVarCantBeDeref);
4457 return syms.errSymbol;
4458 } else {
4459 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4460 rs.new AccessError(env, site, sym) :
4461 sym;
4462 rs.accessBase(sym2, pos, location, site, name, true);
4463 return sym;
4464 }
4465 case ERROR:
4466 // preserve identifier names through errors
4467 return types.createErrorType(name, site.tsym, site).tsym;
4468 default:
4469 // The qualifier expression is of a primitive type -- only
4470 // .class is allowed for these.
4471 if (name == names._class) {
4472 // In this case, we have already made sure in Select that
4473 // qualifier expression is a type.
4474 return syms.getClassField(site, types);
4475 } else {
4476 log.error(pos, Errors.CantDeref(site));
4477 return syms.errSymbol;
4478 }
4479 }
4480 }
4481
4482 /** Determine type of identifier or select expression and check that
4483 * (1) the referenced symbol is not deprecated
4484 * (2) the symbol's type is safe (@see checkSafe)
4485 * (3) if symbol is a variable, check that its type and kind are
4486 * compatible with the prototype and protokind.
4487 * (4) if symbol is an instance field of a raw type,
4488 * which is being assigned to, issue an unchecked warning if its
4489 * type changes under erasure.
4490 * (5) if symbol is an instance method of a raw type, issue an
4491 * unchecked warning if its argument types change under erasure.
4492 * If checks succeed:
4493 * If symbol is a constant, return its constant type
4494 * else if symbol is a method, return its result type
4495 * otherwise return its type.
4496 * Otherwise return errType.
4497 *
4498 * @param tree The syntax tree representing the identifier
4499 * @param site If this is a select, the type of the selected
4500 * expression, otherwise the type of the current class.
4501 * @param sym The symbol representing the identifier.
4502 * @param env The current environment.
4503 * @param resultInfo The expected result
4504 */
4505 Type checkId(JCTree tree,
4506 Type site,
4507 Symbol sym,
4508 Env<AttrContext> env,
4509 ResultInfo resultInfo) {
4510 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4511 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4512 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4513 }
4514
4515 Type checkMethodIdInternal(JCTree tree,
4516 Type site,
4517 Symbol sym,
4518 Env<AttrContext> env,
4519 ResultInfo resultInfo) {
4520 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4521 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4522 } else {
4523 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4524 }
4525 }
4526
4527 Type checkIdInternal(JCTree tree,
4528 Type site,
4529 Symbol sym,
4530 Type pt,
4531 Env<AttrContext> env,
4532 ResultInfo resultInfo) {
4533 if (pt.isErroneous()) {
4534 return types.createErrorType(site);
4535 }
4536 Type owntype; // The computed type of this identifier occurrence.
4537 switch (sym.kind) {
4538 case TYP:
4539 // For types, the computed type equals the symbol's type,
4540 // except for two situations:
4541 owntype = sym.type;
4542 if (owntype.hasTag(CLASS)) {
4543 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4544 Type ownOuter = owntype.getEnclosingType();
4545
4546 // (a) If the symbol's type is parameterized, erase it
4547 // because no type parameters were given.
4548 // We recover generic outer type later in visitTypeApply.
4549 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4550 owntype = types.erasure(owntype);
4551 }
4552
4553 // (b) If the symbol's type is an inner class, then
4554 // we have to interpret its outer type as a superclass
4555 // of the site type. Example:
4556 //
4557 // class Tree<A> { class Visitor { ... } }
4558 // class PointTree extends Tree<Point> { ... }
4559 // ...PointTree.Visitor...
4560 //
4561 // Then the type of the last expression above is
4562 // Tree<Point>.Visitor.
4563 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4564 Type normOuter = site;
4565 if (normOuter.hasTag(CLASS)) {
4566 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4567 }
4568 if (normOuter == null) // perhaps from an import
4569 normOuter = types.erasure(ownOuter);
4570 if (normOuter != ownOuter)
4571 owntype = new ClassType(
4572 normOuter, List.nil(), owntype.tsym,
4573 owntype.getMetadata());
4574 }
4575 }
4576 break;
4577 case VAR:
4578 VarSymbol v = (VarSymbol)sym;
4579
4580 if (env.info.enclVar != null
4581 && v.type.hasTag(NONE)) {
4582 //self reference to implicitly typed variable declaration
4583 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4584 return v.type = types.createErrorType(v.type);
4585 }
4586
4587 // Test (4): if symbol is an instance field of a raw type,
4588 // which is being assigned to, issue an unchecked warning if
4589 // its type changes under erasure.
4590 if (KindSelector.ASG.subset(pkind()) &&
4591 v.owner.kind == TYP &&
4592 (v.flags() & STATIC) == 0 &&
4593 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4594 Type s = types.asOuterSuper(site, v.owner);
4595 if (s != null &&
4596 s.isRaw() &&
4597 !types.isSameType(v.type, v.erasure(types))) {
4598 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4599 }
4600 }
4601 // The computed type of a variable is the type of the
4602 // variable symbol, taken as a member of the site type.
4603 owntype = (sym.owner.kind == TYP &&
4604 sym.name != names._this && sym.name != names._super)
4605 ? types.memberType(site, sym)
4606 : sym.type;
4607
4608 // If the variable is a constant, record constant value in
4609 // computed type.
4610 if (v.getConstValue() != null && isStaticReference(tree))
4611 owntype = owntype.constType(v.getConstValue());
4612
4613 if (resultInfo.pkind == KindSelector.VAL) {
4614 owntype = capture(owntype); // capture "names as expressions"
4615 }
4616 break;
4617 case MTH: {
4618 owntype = checkMethod(site, sym,
4619 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4620 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4621 resultInfo.pt.getTypeArguments());
4622 break;
4623 }
4624 case PCK: case ERR:
4625 owntype = sym.type;
4626 break;
4627 default:
4628 throw new AssertionError("unexpected kind: " + sym.kind +
4629 " in tree " + tree);
4630 }
4631
4632 // Emit a `deprecation' warning if symbol is deprecated.
4633 // (for constructors (but not for constructor references), the error
4634 // was given when the constructor was resolved)
4635
4636 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4637 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4638 chk.checkSunAPI(tree.pos(), sym);
4639 chk.checkProfile(tree.pos(), sym);
4640 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4641 }
4642
4643 // If symbol is a variable, check that its type and
4644 // kind are compatible with the prototype and protokind.
4645 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4646 }
4647
4648 /** Check that variable is initialized and evaluate the variable's
4649 * initializer, if not yet done. Also check that variable is not
4650 * referenced before it is defined.
4651 * @param tree The tree making up the variable reference.
4652 * @param env The current environment.
4653 * @param v The variable's symbol.
4654 */
4655 private void checkInit(JCTree tree,
4656 Env<AttrContext> env,
4657 VarSymbol v,
4658 boolean onlyWarning) {
4659 // A forward reference is diagnosed if the declaration position
4660 // of the variable is greater than the current tree position
4661 // and the tree and variable definition occur in the same class
4662 // definition. Note that writes don't count as references.
4663 // This check applies only to class and instance
4664 // variables. Local variables follow different scope rules,
4665 // and are subject to definite assignment checking.
4666 Env<AttrContext> initEnv = enclosingInitEnv(env);
4667 if (initEnv != null &&
4668 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4669 v.owner.kind == TYP &&
4670 v.owner == env.info.scope.owner.enclClass() &&
4671 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4672 (!env.tree.hasTag(ASSIGN) ||
4673 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4674 if (!onlyWarning || isStaticEnumField(v)) {
4675 Error errkey = (initEnv.info.enclVar == v) ?
4676 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4677 log.error(tree.pos(), errkey);
4678 } else if (useBeforeDeclarationWarning) {
4679 Warning warnkey = (initEnv.info.enclVar == v) ?
4680 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4681 log.warning(tree.pos(), warnkey);
4682 }
4683 }
4684
4685 v.getConstValue(); // ensure initializer is evaluated
4686
4687 checkEnumInitializer(tree, env, v);
4688 }
4689
4690 /**
4691 * Returns the enclosing init environment associated with this env (if any). An init env
4692 * can be either a field declaration env or a static/instance initializer env.
4693 */
4694 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4695 while (true) {
4696 switch (env.tree.getTag()) {
4697 case VARDEF:
4698 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4699 if (vdecl.sym.owner.kind == TYP) {
4700 //field
4701 return env;
4702 }
4703 break;
4704 case BLOCK:
4705 if (env.next.tree.hasTag(CLASSDEF)) {
4706 //instance/static initializer
4707 return env;
4708 }
4709 break;
4710 case METHODDEF:
4711 case CLASSDEF:
4712 case TOPLEVEL:
4713 return null;
4714 }
4715 Assert.checkNonNull(env.next);
4716 env = env.next;
4717 }
4718 }
4719
4720 /**
4721 * Check for illegal references to static members of enum. In
4722 * an enum type, constructors and initializers may not
4723 * reference its static members unless they are constant.
4724 *
4725 * @param tree The tree making up the variable reference.
4726 * @param env The current environment.
4727 * @param v The variable's symbol.
4728 * @jls 8.9 Enum Types
4729 */
4730 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4731 // JLS:
4732 //
4733 // "It is a compile-time error to reference a static field
4734 // of an enum type that is not a compile-time constant
4735 // (15.28) from constructors, instance initializer blocks,
4736 // or instance variable initializer expressions of that
4737 // type. It is a compile-time error for the constructors,
4738 // instance initializer blocks, or instance variable
4739 // initializer expressions of an enum constant e to refer
4740 // to itself or to an enum constant of the same type that
4741 // is declared to the right of e."
4742 if (isStaticEnumField(v)) {
4743 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4744
4745 if (enclClass == null || enclClass.owner == null)
4746 return;
4747
4748 // See if the enclosing class is the enum (or a
4749 // subclass thereof) declaring v. If not, this
4750 // reference is OK.
4751 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4752 return;
4753
4754 // If the reference isn't from an initializer, then
4755 // the reference is OK.
4756 if (!Resolve.isInitializer(env))
4757 return;
4758
4759 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4760 }
4761 }
4762
4763 /** Is the given symbol a static, non-constant field of an Enum?
4764 * Note: enum literals should not be regarded as such
4765 */
4766 private boolean isStaticEnumField(VarSymbol v) {
4767 return Flags.isEnum(v.owner) &&
4768 Flags.isStatic(v) &&
4769 !Flags.isConstant(v) &&
4770 v.name != names._class;
4771 }
4772
4773 /**
4774 * Check that method arguments conform to its instantiation.
4775 **/
4776 public Type checkMethod(Type site,
4777 final Symbol sym,
4778 ResultInfo resultInfo,
4779 Env<AttrContext> env,
4780 final List<JCExpression> argtrees,
4781 List<Type> argtypes,
4782 List<Type> typeargtypes) {
4783 // Test (5): if symbol is an instance method of a raw type, issue
4784 // an unchecked warning if its argument types change under erasure.
4785 if ((sym.flags() & STATIC) == 0 &&
4786 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4787 Type s = types.asOuterSuper(site, sym.owner);
4788 if (s != null && s.isRaw() &&
4789 !types.isSameTypes(sym.type.getParameterTypes(),
4790 sym.erasure(types).getParameterTypes())) {
4791 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4792 }
4793 }
4794
4795 if (env.info.defaultSuperCallSite != null) {
4796 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4797 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4798 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4799 List<MethodSymbol> icand_sup =
4800 types.interfaceCandidates(sup, (MethodSymbol)sym);
4801 if (icand_sup.nonEmpty() &&
4802 icand_sup.head != sym &&
4803 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4804 log.error(env.tree.pos(),
4805 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4806 break;
4807 }
4808 }
4809 env.info.defaultSuperCallSite = null;
4810 }
4811
4812 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4813 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4814 if (app.meth.hasTag(SELECT) &&
4815 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4816 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4817 }
4818 }
4819
4820 // Compute the identifier's instantiated type.
4821 // For methods, we need to compute the instance type by
4822 // Resolve.instantiate from the symbol's type as well as
4823 // any type arguments and value arguments.
4824 Warner noteWarner = new Warner();
4825 try {
4826 Type owntype = rs.checkMethod(
4827 env,
4828 site,
4829 sym,
4830 resultInfo,
4831 argtypes,
4832 typeargtypes,
4833 noteWarner);
4834
4835 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4836 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4837
4838 argtypes = argtypes.map(checkDeferredMap);
4839
4840 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4841 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4842 sym.name,
4843 rs.methodArguments(sym.type.getParameterTypes()),
4844 rs.methodArguments(argtypes.map(checkDeferredMap)),
4845 kindName(sym.location()),
4846 sym.location()));
4847 if (resultInfo.pt != Infer.anyPoly ||
4848 !owntype.hasTag(METHOD) ||
4849 !owntype.isPartial()) {
4850 //if this is not a partially inferred method type, erase return type. Otherwise,
4851 //erasure is carried out in PartiallyInferredMethodType.check().
4852 owntype = new MethodType(owntype.getParameterTypes(),
4853 types.erasure(owntype.getReturnType()),
4854 types.erasure(owntype.getThrownTypes()),
4855 syms.methodClass);
4856 }
4857 }
4858
4859 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4860 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4861 PolyKind.POLY : PolyKind.STANDALONE;
4862 TreeInfo.setPolyKind(env.tree, pkind);
4863
4864 return (resultInfo.pt == Infer.anyPoly) ?
4865 owntype :
4866 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4867 resultInfo.checkContext.inferenceContext());
4868 } catch (Infer.InferenceException ex) {
4869 //invalid target type - propagate exception outwards or report error
4870 //depending on the current check context
4871 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4872 return types.createErrorType(site);
4873 } catch (Resolve.InapplicableMethodException ex) {
4874 final JCDiagnostic diag = ex.getDiagnostic();
4875 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4876 @Override
4877 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4878 return new Pair<>(sym, diag);
4879 }
4880 };
4881 List<Type> argtypes2 = argtypes.map(
4882 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4883 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4884 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4885 log.report(errDiag);
4886 return types.createErrorType(site);
4887 }
4888 }
4889
4890 public void visitLiteral(JCLiteral tree) {
4891 result = check(tree, litType(tree.typetag).constType(tree.value),
4892 KindSelector.VAL, resultInfo);
4893 }
4894 //where
4895 /** Return the type of a literal with given type tag.
4896 */
4897 Type litType(TypeTag tag) {
4898 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4899 }
4900
4901 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
4902 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
4903 }
4904
4905 public void visitTypeArray(JCArrayTypeTree tree) {
4906 Type etype = attribType(tree.elemtype, env);
4907 Type type = new ArrayType(etype, syms.arrayClass);
4908 result = check(tree, type, KindSelector.TYP, resultInfo);
4909 }
4910
4911 /** Visitor method for parameterized types.
4912 * Bound checking is left until later, since types are attributed
4913 * before supertype structure is completely known
4914 */
4915 public void visitTypeApply(JCTypeApply tree) {
4916 Type owntype = types.createErrorType(tree.type);
4917
4918 // Attribute functor part of application and make sure it's a class.
4919 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
4920
4921 // Attribute type parameters
4922 List<Type> actuals = attribTypes(tree.arguments, env);
4923
4924 if (clazztype.hasTag(CLASS)) {
4925 List<Type> formals = clazztype.tsym.type.getTypeArguments();
4926 if (actuals.isEmpty()) //diamond
4927 actuals = formals;
4928
4929 if (actuals.length() == formals.length()) {
4930 List<Type> a = actuals;
4931 List<Type> f = formals;
4932 while (a.nonEmpty()) {
4933 a.head = a.head.withTypeVar(f.head);
4934 a = a.tail;
4935 f = f.tail;
4936 }
4937 // Compute the proper generic outer
4938 Type clazzOuter = clazztype.getEnclosingType();
4939 if (clazzOuter.hasTag(CLASS)) {
4940 Type site;
4941 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
4942 if (clazz.hasTag(IDENT)) {
4943 site = env.enclClass.sym.type;
4944 } else if (clazz.hasTag(SELECT)) {
4945 site = ((JCFieldAccess) clazz).selected.type;
4946 } else throw new AssertionError(""+tree);
4947 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
4948 if (site.hasTag(CLASS))
4949 site = types.asOuterSuper(site, clazzOuter.tsym);
4950 if (site == null)
4951 site = types.erasure(clazzOuter);
4952 clazzOuter = site;
4953 }
4954 }
4955 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
4956 clazztype.getMetadata());
4957 } else {
4958 if (formals.length() != 0) {
4959 log.error(tree.pos(),
4960 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
4961 } else {
4962 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
4963 }
4964 owntype = types.createErrorType(tree.type);
4965 }
4966 }
4967 result = check(tree, owntype, KindSelector.TYP, resultInfo);
4968 }
4969
4970 public void visitTypeUnion(JCTypeUnion tree) {
4971 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
4972 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
4973 for (JCExpression typeTree : tree.alternatives) {
4974 Type ctype = attribType(typeTree, env);
4975 ctype = chk.checkType(typeTree.pos(),
4976 chk.checkClassType(typeTree.pos(), ctype),
4977 syms.throwableType);
4978 if (!ctype.isErroneous()) {
4979 //check that alternatives of a union type are pairwise
4980 //unrelated w.r.t. subtyping
4981 if (chk.intersects(ctype, multicatchTypes.toList())) {
4982 for (Type t : multicatchTypes) {
4983 boolean sub = types.isSubtype(ctype, t);
4984 boolean sup = types.isSubtype(t, ctype);
4985 if (sub || sup) {
4986 //assume 'a' <: 'b'
4987 Type a = sub ? ctype : t;
4988 Type b = sub ? t : ctype;
4989 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
4990 }
4991 }
4992 }
4993 multicatchTypes.append(ctype);
4994 if (all_multicatchTypes != null)
4995 all_multicatchTypes.append(ctype);
4996 } else {
4997 if (all_multicatchTypes == null) {
4998 all_multicatchTypes = new ListBuffer<>();
4999 all_multicatchTypes.appendList(multicatchTypes);
5000 }
5001 all_multicatchTypes.append(ctype);
5002 }
5003 }
5004 Type t = check(tree, types.lub(multicatchTypes.toList()),
5005 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5006 if (t.hasTag(CLASS)) {
5007 List<Type> alternatives =
5008 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5009 t = new UnionClassType((ClassType) t, alternatives);
5010 }
5011 tree.type = result = t;
5012 }
5013
5014 public void visitTypeIntersection(JCTypeIntersection tree) {
5015 attribTypes(tree.bounds, env);
5016 tree.type = result = checkIntersection(tree, tree.bounds);
5017 }
5018
5019 public void visitTypeParameter(JCTypeParameter tree) {
5020 TypeVar typeVar = (TypeVar) tree.type;
5021
5022 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5023 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5024 }
5025
5026 if (!typeVar.getUpperBound().isErroneous()) {
5027 //fixup type-parameter bound computed in 'attribTypeVariables'
5028 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5029 }
5030 }
5031
5032 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5033 Set<Type> boundSet = new HashSet<>();
5034 if (bounds.nonEmpty()) {
5035 // accept class or interface or typevar as first bound.
5036 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5037 boundSet.add(types.erasure(bounds.head.type));
5038 if (bounds.head.type.isErroneous()) {
5039 return bounds.head.type;
5040 }
5041 else if (bounds.head.type.hasTag(TYPEVAR)) {
5042 // if first bound was a typevar, do not accept further bounds.
5043 if (bounds.tail.nonEmpty()) {
5044 log.error(bounds.tail.head.pos(),
5045 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5046 return bounds.head.type;
5047 }
5048 } else {
5049 // if first bound was a class or interface, accept only interfaces
5050 // as further bounds.
5051 for (JCExpression bound : bounds.tail) {
5052 bound.type = checkBase(bound.type, bound, env, false, true, false);
5053 if (bound.type.isErroneous()) {
5054 bounds = List.of(bound);
5055 }
5056 else if (bound.type.hasTag(CLASS)) {
5057 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5058 }
5059 }
5060 }
5061 }
5062
5063 if (bounds.length() == 0) {
5064 return syms.objectType;
5065 } else if (bounds.length() == 1) {
5066 return bounds.head.type;
5067 } else {
5068 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5069 // ... the variable's bound is a class type flagged COMPOUND
5070 // (see comment for TypeVar.bound).
5071 // In this case, generate a class tree that represents the
5072 // bound class, ...
5073 JCExpression extending;
5074 List<JCExpression> implementing;
5075 if (!bounds.head.type.isInterface()) {
5076 extending = bounds.head;
5077 implementing = bounds.tail;
5078 } else {
5079 extending = null;
5080 implementing = bounds;
5081 }
5082 JCClassDecl cd = make.at(tree).ClassDef(
5083 make.Modifiers(PUBLIC | ABSTRACT),
5084 names.empty, List.nil(),
5085 extending, implementing, List.nil());
5086
5087 ClassSymbol c = (ClassSymbol)owntype.tsym;
5088 Assert.check((c.flags() & COMPOUND) != 0);
5089 cd.sym = c;
5090 c.sourcefile = env.toplevel.sourcefile;
5091
5092 // ... and attribute the bound class
5093 c.flags_field |= UNATTRIBUTED;
5094 Env<AttrContext> cenv = enter.classEnv(cd, env);
5095 typeEnvs.put(c, cenv);
5096 attribClass(c);
5097 return owntype;
5098 }
5099 }
5100
5101 public void visitWildcard(JCWildcard tree) {
5102 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5103 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5104 ? syms.objectType
5105 : attribType(tree.inner, env);
5106 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5107 tree.kind.kind,
5108 syms.boundClass),
5109 KindSelector.TYP, resultInfo);
5110 }
5111
5112 public void visitAnnotation(JCAnnotation tree) {
5113 Assert.error("should be handled in annotate");
5114 }
5115
5116 @Override
5117 public void visitModifiers(JCModifiers tree) {
5118 //error recovery only:
5119 Assert.check(resultInfo.pkind == KindSelector.ERR);
5120
5121 attribAnnotationTypes(tree.annotations, env);
5122 }
5123
5124 public void visitAnnotatedType(JCAnnotatedType tree) {
5125 attribAnnotationTypes(tree.annotations, env);
5126 Type underlyingType = attribType(tree.underlyingType, env);
5127 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5128
5129 if (!env.info.isNewClass)
5130 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5131 result = tree.type = annotatedType;
5132 }
5133
5134 public void visitErroneous(JCErroneous tree) {
5135 if (tree.errs != null) {
5136 Env<AttrContext> errEnv = env.dup(env.tree);
5137 errEnv.info.returnResult = unknownExprInfo;
5138 for (JCTree err : tree.errs)
5139 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5140 }
5141 result = tree.type = syms.errType;
5142 }
5143
5144 /** Default visitor method for all other trees.
5145 */
5146 public void visitTree(JCTree tree) {
5147 throw new AssertionError();
5148 }
5149
5150 /**
5151 * Attribute an env for either a top level tree or class or module declaration.
5152 */
5153 public void attrib(Env<AttrContext> env) {
5154 switch (env.tree.getTag()) {
5155 case MODULEDEF:
5156 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5157 break;
5158 case TOPLEVEL:
5159 attribTopLevel(env);
5160 break;
5161 case PACKAGEDEF:
5162 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5163 break;
5164 default:
5165 attribClass(env.tree.pos(), env.enclClass.sym);
5166 }
5167 }
5168
5169 /**
5170 * Attribute a top level tree. These trees are encountered when the
5171 * package declaration has annotations.
5172 */
5173 public void attribTopLevel(Env<AttrContext> env) {
5174 JCCompilationUnit toplevel = env.toplevel;
5175 try {
5176 annotate.flush();
5177 } catch (CompletionFailure ex) {
5178 chk.completionError(toplevel.pos(), ex);
5179 }
5180 }
5181
5182 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5183 try {
5184 annotate.flush();
5185 attribPackage(p);
5186 } catch (CompletionFailure ex) {
5187 chk.completionError(pos, ex);
5188 }
5189 }
5190
5191 void attribPackage(PackageSymbol p) {
5192 attribWithLint(p,
5193 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5194 }
5195
5196 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5197 try {
5198 annotate.flush();
5199 attribModule(m);
5200 } catch (CompletionFailure ex) {
5201 chk.completionError(pos, ex);
5202 }
5203 }
5204
5205 void attribModule(ModuleSymbol m) {
5206 attribWithLint(m, env -> attribStat(env.tree, env));
5207 }
5208
5209 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5210 Env<AttrContext> env = typeEnvs.get(sym);
5211
5212 Env<AttrContext> lintEnv = env;
5213 while (lintEnv.info.lint == null)
5214 lintEnv = lintEnv.next;
5215
5216 Lint lint = lintEnv.info.lint.augment(sym);
5217
5218 Lint prevLint = chk.setLint(lint);
5219 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5220
5221 try {
5222 deferredLintHandler.flush(env.tree.pos());
5223 attrib.accept(env);
5224 } finally {
5225 log.useSource(prev);
5226 chk.setLint(prevLint);
5227 }
5228 }
5229
5230 /** Main method: attribute class definition associated with given class symbol.
5231 * reporting completion failures at the given position.
5232 * @param pos The source position at which completion errors are to be
5233 * reported.
5234 * @param c The class symbol whose definition will be attributed.
5235 */
5236 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5237 try {
5238 annotate.flush();
5239 attribClass(c);
5240 } catch (CompletionFailure ex) {
5241 chk.completionError(pos, ex);
5242 }
5243 }
5244
5245 /** Attribute class definition associated with given class symbol.
5246 * @param c The class symbol whose definition will be attributed.
5247 */
5248 void attribClass(ClassSymbol c) throws CompletionFailure {
5249 if (c.type.hasTag(ERROR)) return;
5250
5251 // Check for cycles in the inheritance graph, which can arise from
5252 // ill-formed class files.
5253 chk.checkNonCyclic(null, c.type);
5254
5255 Type st = types.supertype(c.type);
5256 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5257 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5258 // First, attribute superclass.
5259 if (st.hasTag(CLASS))
5260 attribClass((ClassSymbol)st.tsym);
5261
5262 // Next attribute owner, if it is a class.
5263 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5264 attribClass((ClassSymbol)c.owner);
5265
5266 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5267 }
5268
5269 // The previous operations might have attributed the current class
5270 // if there was a cycle. So we test first whether the class is still
5271 // UNATTRIBUTED.
5272 if ((c.flags_field & UNATTRIBUTED) != 0) {
5273 c.flags_field &= ~UNATTRIBUTED;
5274
5275 // Get environment current at the point of class definition.
5276 Env<AttrContext> env = typeEnvs.get(c);
5277
5278 if (c.isSealed() &&
5279 !c.isEnum() &&
5280 !c.isPermittedExplicit &&
5281 c.permitted.isEmpty()) {
5282 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5283 }
5284
5285 if (c.isSealed()) {
5286 Set<Symbol> permittedTypes = new HashSet<>();
5287 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5288 for (Symbol subTypeSym : c.permitted) {
5289 boolean isTypeVar = false;
5290 if (subTypeSym.type.getTag() == TYPEVAR) {
5291 isTypeVar = true; //error recovery
5292 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5293 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5294 }
5295 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5296 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5297 }
5298 if (permittedTypes.contains(subTypeSym)) {
5299 DiagnosticPosition pos =
5300 env.enclClass.permitting.stream()
5301 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5302 .limit(2).collect(List.collector()).get(1);
5303 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5304 } else {
5305 permittedTypes.add(subTypeSym);
5306 }
5307 if (sealedInUnnamed) {
5308 if (subTypeSym.packge() != c.packge()) {
5309 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5310 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5311 );
5312 }
5313 } else if (subTypeSym.packge().modle != c.packge().modle) {
5314 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5315 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5316 );
5317 }
5318 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5319 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5320 Errors.InvalidPermitsClause(
5321 subTypeSym == c.type.tsym ?
5322 Fragments.MustNotBeSameClass :
5323 Fragments.MustNotBeSupertype(subTypeSym.type)
5324 )
5325 );
5326 } else if (!isTypeVar) {
5327 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5328 .stream()
5329 .anyMatch(d -> d.tsym == c);
5330 if (!thisIsASuper) {
5331 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5332 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5333 }
5334 }
5335 }
5336 }
5337
5338 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5339 .stream()
5340 .filter(s -> s.tsym.isSealed())
5341 .map(s -> (ClassSymbol) s.tsym)
5342 .collect(List.collector());
5343
5344 if (sealedSupers.isEmpty()) {
5345 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5346 boolean hasErrorSuper = false;
5347
5348 hasErrorSuper |= types.directSupertypes(c.type)
5349 .stream()
5350 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5351
5352 ClassType ct = (ClassType) c.type;
5353
5354 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5355
5356 if (!hasErrorSuper) {
5357 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5358 }
5359 }
5360 } else {
5361 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5362 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5363 }
5364
5365 if (!c.type.isCompound()) {
5366 for (ClassSymbol supertypeSym : sealedSupers) {
5367 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5368 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5369 }
5370 }
5371 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5372 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5373 c.isInterface() ?
5374 Errors.NonSealedOrSealedExpected :
5375 Errors.NonSealedSealedOrFinalExpected);
5376 }
5377 }
5378 }
5379
5380 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5381 // because the annotations were not available at the time the env was created. Therefore,
5382 // we look up the environment chain for the first enclosing environment for which the
5383 // lint value is set. Typically, this is the parent env, but might be further if there
5384 // are any envs created as a result of TypeParameter nodes.
5385 Env<AttrContext> lintEnv = env;
5386 while (lintEnv.info.lint == null)
5387 lintEnv = lintEnv.next;
5388
5389 // Having found the enclosing lint value, we can initialize the lint value for this class
5390 env.info.lint = lintEnv.info.lint.augment(c);
5391
5392 Lint prevLint = chk.setLint(env.info.lint);
5393 JavaFileObject prev = log.useSource(c.sourcefile);
5394 ResultInfo prevReturnRes = env.info.returnResult;
5395
5396 try {
5397 deferredLintHandler.flush(env.tree);
5398 env.info.returnResult = null;
5399 // java.lang.Enum may not be subclassed by a non-enum
5400 if (st.tsym == syms.enumSym &&
5401 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5402 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5403
5404 // Enums may not be extended by source-level classes
5405 if (st.tsym != null &&
5406 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5407 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5408 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5409 }
5410
5411 if (rs.isSerializable(c.type)) {
5412 env.info.isSerializable = true;
5413 }
5414
5415 attribClassBody(env, c);
5416
5417 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5418 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5419 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5420 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5421 } finally {
5422 env.info.returnResult = prevReturnRes;
5423 log.useSource(prev);
5424 chk.setLint(prevLint);
5425 }
5426
5427 }
5428 }
5429
5430 public void visitImport(JCImport tree) {
5431 // nothing to do
5432 }
5433
5434 public void visitModuleDef(JCModuleDecl tree) {
5435 tree.sym.completeUsesProvides();
5436 ModuleSymbol msym = tree.sym;
5437 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5438 Lint prevLint = chk.setLint(lint);
5439 chk.checkModuleName(tree);
5440 chk.checkDeprecatedAnnotation(tree, msym);
5441
5442 try {
5443 deferredLintHandler.flush(tree.pos());
5444 } finally {
5445 chk.setLint(prevLint);
5446 }
5447 }
5448
5449 /** Finish the attribution of a class. */
5450 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5451 JCClassDecl tree = (JCClassDecl)env.tree;
5452 Assert.check(c == tree.sym);
5453
5454 // Validate type parameters, supertype and interfaces.
5455 attribStats(tree.typarams, env);
5456 if (!c.isAnonymous()) {
5457 //already checked if anonymous
5458 chk.validate(tree.typarams, env);
5459 chk.validate(tree.extending, env);
5460 chk.validate(tree.implementing, env);
5461 }
5462
5463 c.markAbstractIfNeeded(types);
5464
5465 // If this is a non-abstract class, check that it has no abstract
5466 // methods or unimplemented methods of an implemented interface.
5467 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5468 chk.checkAllDefined(tree.pos(), c);
5469 }
5470
5471 if ((c.flags() & ANNOTATION) != 0) {
5472 if (tree.implementing.nonEmpty())
5473 log.error(tree.implementing.head.pos(),
5474 Errors.CantExtendIntfAnnotation);
5475 if (tree.typarams.nonEmpty()) {
5476 log.error(tree.typarams.head.pos(),
5477 Errors.IntfAnnotationCantHaveTypeParams(c));
5478 }
5479
5480 // If this annotation type has a @Repeatable, validate
5481 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5482 // If this annotation type has a @Repeatable, validate
5483 if (repeatable != null) {
5484 // get diagnostic position for error reporting
5485 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5486 Assert.checkNonNull(cbPos);
5487
5488 chk.validateRepeatable(c, repeatable, cbPos);
5489 }
5490 } else {
5491 // Check that all extended classes and interfaces
5492 // are compatible (i.e. no two define methods with same arguments
5493 // yet different return types). (JLS 8.4.8.3)
5494 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5495 if (allowDefaultMethods) {
5496 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5497 }
5498 }
5499
5500 // Check that class does not import the same parameterized interface
5501 // with two different argument lists.
5502 chk.checkClassBounds(tree.pos(), c.type);
5503
5504 tree.type = c.type;
5505
5506 for (List<JCTypeParameter> l = tree.typarams;
5507 l.nonEmpty(); l = l.tail) {
5508 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5509 }
5510
5511 // Check that a generic class doesn't extend Throwable
5512 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5513 log.error(tree.extending.pos(), Errors.GenericThrowable);
5514
5515 // Check that all methods which implement some
5516 // method conform to the method they implement.
5517 chk.checkImplementations(tree);
5518
5519 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5520 checkAutoCloseable(tree.pos(), env, c.type);
5521
5522 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5523 // Attribute declaration
5524 attribStat(l.head, env);
5525 // Check that declarations in inner classes are not static (JLS 8.1.2)
5526 // Make an exception for static constants.
5527 if (!allowRecords &&
5528 c.owner.kind != PCK &&
5529 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5530 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5531 VarSymbol sym = null;
5532 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5533 if (sym == null ||
5534 sym.kind != VAR ||
5535 sym.getConstValue() == null)
5536 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5537 }
5538 }
5539
5540 // Check for cycles among non-initial constructors.
5541 chk.checkCyclicConstructors(tree);
5542
5543 // Check for cycles among annotation elements.
5544 chk.checkNonCyclicElements(tree);
5545
5546 // Check for proper use of serialVersionUID and other
5547 // serialization-related fields and methods
5548 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5549 && rs.isSerializable(c.type)
5550 && !c.isAnonymous()) {
5551 chk.checkSerialStructure(tree, c);
5552 }
5553 if (allowTypeAnnos) {
5554 // Correctly organize the positions of the type annotations
5555 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5556
5557 // Check type annotations applicability rules
5558 validateTypeAnnotations(tree, false);
5559 }
5560 }
5561 // where
5562 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5563 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5564 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5565 if (types.isSameType(al.head.annotationType.type, t))
5566 return al.head.pos();
5567 }
5568
5569 return null;
5570 }
5571
5572 private Type capture(Type type) {
5573 return types.capture(type);
5574 }
5575
5576 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5577 if (type.isErroneous()) {
5578 tree.vartype = make.at(Position.NOPOS).Erroneous();
5579 } else {
5580 tree.vartype = make.at(Position.NOPOS).Type(type);
5581 }
5582 }
5583
5584 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5585 tree.accept(new TypeAnnotationsValidator(sigOnly));
5586 }
5587 //where
5588 private final class TypeAnnotationsValidator extends TreeScanner {
5589
5590 private final boolean sigOnly;
5591 public TypeAnnotationsValidator(boolean sigOnly) {
5592 this.sigOnly = sigOnly;
5593 }
5594
5595 public void visitAnnotation(JCAnnotation tree) {
5596 chk.validateTypeAnnotation(tree, false);
5597 super.visitAnnotation(tree);
5598 }
5599 public void visitAnnotatedType(JCAnnotatedType tree) {
5600 if (!tree.underlyingType.type.isErroneous()) {
5601 super.visitAnnotatedType(tree);
5602 }
5603 }
5604 public void visitTypeParameter(JCTypeParameter tree) {
5605 chk.validateTypeAnnotations(tree.annotations, true);
5606 scan(tree.bounds);
5607 // Don't call super.
5608 // This is needed because above we call validateTypeAnnotation with
5609 // false, which would forbid annotations on type parameters.
5610 // super.visitTypeParameter(tree);
5611 }
5612 public void visitMethodDef(JCMethodDecl tree) {
5613 if (tree.recvparam != null &&
5614 !tree.recvparam.vartype.type.isErroneous()) {
5615 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5616 }
5617 if (tree.restype != null && tree.restype.type != null) {
5618 validateAnnotatedType(tree.restype, tree.restype.type);
5619 }
5620 if (sigOnly) {
5621 scan(tree.mods);
5622 scan(tree.restype);
5623 scan(tree.typarams);
5624 scan(tree.recvparam);
5625 scan(tree.params);
5626 scan(tree.thrown);
5627 } else {
5628 scan(tree.defaultValue);
5629 scan(tree.body);
5630 }
5631 }
5632 public void visitVarDef(final JCVariableDecl tree) {
5633 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5634 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5635 validateAnnotatedType(tree.vartype, tree.sym.type);
5636 scan(tree.mods);
5637 scan(tree.vartype);
5638 if (!sigOnly) {
5639 scan(tree.init);
5640 }
5641 }
5642 public void visitTypeCast(JCTypeCast tree) {
5643 if (tree.clazz != null && tree.clazz.type != null)
5644 validateAnnotatedType(tree.clazz, tree.clazz.type);
5645 super.visitTypeCast(tree);
5646 }
5647 public void visitTypeTest(JCInstanceOf tree) {
5648 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5649 validateAnnotatedType(tree.pattern, tree.pattern.type);
5650 super.visitTypeTest(tree);
5651 }
5652 public void visitNewClass(JCNewClass tree) {
5653 if (tree.clazz != null && tree.clazz.type != null) {
5654 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5655 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5656 tree.clazz.type.tsym);
5657 }
5658 if (tree.def != null) {
5659 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5660 }
5661
5662 validateAnnotatedType(tree.clazz, tree.clazz.type);
5663 }
5664 super.visitNewClass(tree);
5665 }
5666 public void visitNewArray(JCNewArray tree) {
5667 if (tree.elemtype != null && tree.elemtype.type != null) {
5668 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5669 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5670 tree.elemtype.type.tsym);
5671 }
5672 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5673 }
5674 super.visitNewArray(tree);
5675 }
5676 public void visitClassDef(JCClassDecl tree) {
5677 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5678 if (sigOnly) {
5679 scan(tree.mods);
5680 scan(tree.typarams);
5681 scan(tree.extending);
5682 scan(tree.implementing);
5683 }
5684 for (JCTree member : tree.defs) {
5685 if (member.hasTag(Tag.CLASSDEF)) {
5686 continue;
5687 }
5688 scan(member);
5689 }
5690 }
5691 public void visitBlock(JCBlock tree) {
5692 if (!sigOnly) {
5693 scan(tree.stats);
5694 }
5695 }
5696
5697 /* I would want to model this after
5698 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5699 * and override visitSelect and visitTypeApply.
5700 * However, we only set the annotated type in the top-level type
5701 * of the symbol.
5702 * Therefore, we need to override each individual location where a type
5703 * can occur.
5704 */
5705 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5706 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5707
5708 if (type.isPrimitiveOrVoid()) {
5709 return;
5710 }
5711
5712 JCTree enclTr = errtree;
5713 Type enclTy = type;
5714
5715 boolean repeat = true;
5716 while (repeat) {
5717 if (enclTr.hasTag(TYPEAPPLY)) {
5718 List<Type> tyargs = enclTy.getTypeArguments();
5719 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5720 if (trargs.length() > 0) {
5721 // Nothing to do for diamonds
5722 if (tyargs.length() == trargs.length()) {
5723 for (int i = 0; i < tyargs.length(); ++i) {
5724 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5725 }
5726 }
5727 // If the lengths don't match, it's either a diamond
5728 // or some nested type that redundantly provides
5729 // type arguments in the tree.
5730 }
5731
5732 // Look at the clazz part of a generic type
5733 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5734 }
5735
5736 if (enclTr.hasTag(SELECT)) {
5737 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5738 if (enclTy != null &&
5739 !enclTy.hasTag(NONE)) {
5740 enclTy = enclTy.getEnclosingType();
5741 }
5742 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5743 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5744 if (enclTy == null || enclTy.hasTag(NONE)) {
5745 if (at.getAnnotations().size() == 1) {
5746 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5747 } else {
5748 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5749 for (JCAnnotation an : at.getAnnotations()) {
5750 comps.add(an.attribute);
5751 }
5752 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5753 }
5754 repeat = false;
5755 }
5756 enclTr = at.underlyingType;
5757 // enclTy doesn't need to be changed
5758 } else if (enclTr.hasTag(IDENT)) {
5759 repeat = false;
5760 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5761 JCWildcard wc = (JCWildcard) enclTr;
5762 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5763 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5764 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5765 } else {
5766 // Nothing to do for UNBOUND
5767 }
5768 repeat = false;
5769 } else if (enclTr.hasTag(TYPEARRAY)) {
5770 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5771 validateAnnotatedType(art.getType(), art.elemtype.type);
5772 repeat = false;
5773 } else if (enclTr.hasTag(TYPEUNION)) {
5774 JCTypeUnion ut = (JCTypeUnion) enclTr;
5775 for (JCTree t : ut.getTypeAlternatives()) {
5776 validateAnnotatedType(t, t.type);
5777 }
5778 repeat = false;
5779 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5780 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5781 for (JCTree t : it.getBounds()) {
5782 validateAnnotatedType(t, t.type);
5783 }
5784 repeat = false;
5785 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5786 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5787 repeat = false;
5788 } else {
5789 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5790 " within: "+ errtree + " with kind: " + errtree.getKind());
5791 }
5792 }
5793 }
5794
5795 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5796 Symbol sym) {
5797 // Ensure that no declaration annotations are present.
5798 // Note that a tree type might be an AnnotatedType with
5799 // empty annotations, if only declaration annotations were given.
5800 // This method will raise an error for such a type.
5801 for (JCAnnotation ai : annotations) {
5802 if (!ai.type.isErroneous() &&
5803 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5804 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5805 }
5806 }
5807 }
5808 }
5809
5810 // <editor-fold desc="post-attribution visitor">
5811
5812 /**
5813 * Handle missing types/symbols in an AST. This routine is useful when
5814 * the compiler has encountered some errors (which might have ended up
5815 * terminating attribution abruptly); if the compiler is used in fail-over
5816 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5817 * prevents NPE to be propagated during subsequent compilation steps.
5818 */
5819 public void postAttr(JCTree tree) {
5820 new PostAttrAnalyzer().scan(tree);
5821 }
5822
5823 class PostAttrAnalyzer extends TreeScanner {
5824
5825 private void initTypeIfNeeded(JCTree that) {
5826 if (that.type == null) {
5827 if (that.hasTag(METHODDEF)) {
5828 that.type = dummyMethodType((JCMethodDecl)that);
5829 } else {
5830 that.type = syms.unknownType;
5831 }
5832 }
5833 }
5834
5835 /* Construct a dummy method type. If we have a method declaration,
5836 * and the declared return type is void, then use that return type
5837 * instead of UNKNOWN to avoid spurious error messages in lambda
5838 * bodies (see:JDK-8041704).
5839 */
5840 private Type dummyMethodType(JCMethodDecl md) {
5841 Type restype = syms.unknownType;
5842 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5843 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5844 if (prim.typetag == VOID)
5845 restype = syms.voidType;
5846 }
5847 return new MethodType(List.nil(), restype,
5848 List.nil(), syms.methodClass);
5849 }
5850 private Type dummyMethodType() {
5851 return dummyMethodType(null);
5852 }
5853
5854 @Override
5855 public void scan(JCTree tree) {
5856 if (tree == null) return;
5857 if (tree instanceof JCExpression) {
5858 initTypeIfNeeded(tree);
5859 }
5860 super.scan(tree);
5861 }
5862
5863 @Override
5864 public void visitIdent(JCIdent that) {
5865 if (that.sym == null) {
5866 that.sym = syms.unknownSymbol;
5867 }
5868 }
5869
5870 @Override
5871 public void visitSelect(JCFieldAccess that) {
5872 if (that.sym == null) {
5873 that.sym = syms.unknownSymbol;
5874 }
5875 super.visitSelect(that);
5876 }
5877
5878 @Override
5879 public void visitClassDef(JCClassDecl that) {
5880 initTypeIfNeeded(that);
5881 if (that.sym == null) {
5882 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
5883 }
5884 super.visitClassDef(that);
5885 }
5886
5887 @Override
5888 public void visitMethodDef(JCMethodDecl that) {
5889 initTypeIfNeeded(that);
5890 if (that.sym == null) {
5891 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
5892 }
5893 super.visitMethodDef(that);
5894 }
5895
5896 @Override
5897 public void visitVarDef(JCVariableDecl that) {
5898 initTypeIfNeeded(that);
5899 if (that.sym == null) {
5900 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
5901 that.sym.adr = 0;
5902 }
5903 if (that.vartype == null) {
5904 that.vartype = make.at(Position.NOPOS).Erroneous();
5905 }
5906 super.visitVarDef(that);
5907 }
5908
5909 @Override
5910 public void visitBindingPattern(JCBindingPattern that) {
5911 initTypeIfNeeded(that);
5912 initTypeIfNeeded(that.var);
5913 if (that.var.sym == null) {
5914 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
5915 that.var.sym.adr = 0;
5916 }
5917 super.visitBindingPattern(that);
5918 }
5919
5920 @Override
5921 public void visitNewClass(JCNewClass that) {
5922 if (that.constructor == null) {
5923 that.constructor = new MethodSymbol(0, names.init,
5924 dummyMethodType(), syms.noSymbol);
5925 }
5926 if (that.constructorType == null) {
5927 that.constructorType = syms.unknownType;
5928 }
5929 super.visitNewClass(that);
5930 }
5931
5932 @Override
5933 public void visitAssignop(JCAssignOp that) {
5934 if (that.operator == null) {
5935 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5936 -1, syms.noSymbol);
5937 }
5938 super.visitAssignop(that);
5939 }
5940
5941 @Override
5942 public void visitBinary(JCBinary that) {
5943 if (that.operator == null) {
5944 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5945 -1, syms.noSymbol);
5946 }
5947 super.visitBinary(that);
5948 }
5949
5950 @Override
5951 public void visitUnary(JCUnary that) {
5952 if (that.operator == null) {
5953 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5954 -1, syms.noSymbol);
5955 }
5956 super.visitUnary(that);
5957 }
5958
5959 @Override
5960 public void visitReference(JCMemberReference that) {
5961 super.visitReference(that);
5962 if (that.sym == null) {
5963 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
5964 syms.noSymbol);
5965 }
5966 }
5967 }
5968 // </editor-fold>
5969
5970 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
5971 new TreeScanner() {
5972 Symbol packge = pkg;
5973 @Override
5974 public void visitIdent(JCIdent that) {
5975 that.sym = packge;
5976 }
5977
5978 @Override
5979 public void visitSelect(JCFieldAccess that) {
5980 that.sym = packge;
5981 packge = packge.owner;
5982 super.visitSelect(that);
5983 }
5984 }.scan(pid);
5985 }
5986
5987 }