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.Type.ClassType.Flavor;
48 import com.sun.tools.javac.code.TypeMetadata.Annotations;
49 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
50 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
51 import com.sun.tools.javac.comp.Check.CheckContext;
52 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
53 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
54 import com.sun.tools.javac.jvm.*;
55
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
59
60 import com.sun.tools.javac.resources.CompilerProperties.Errors;
61 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
62 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
63 import com.sun.tools.javac.tree.*;
64 import com.sun.tools.javac.tree.JCTree.*;
65 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
66 import com.sun.tools.javac.util.*;
67 import com.sun.tools.javac.util.DefinedBy.Api;
68 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
69 import com.sun.tools.javac.util.JCDiagnostic.Error;
70 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
71 import com.sun.tools.javac.util.JCDiagnostic.Warning;
72 import com.sun.tools.javac.util.List;
73
74 import static com.sun.tools.javac.code.Flags.*;
75 import static com.sun.tools.javac.code.Flags.ANNOTATION;
76 import static com.sun.tools.javac.code.Flags.BLOCK;
77 import static com.sun.tools.javac.code.Kinds.*;
78 import static com.sun.tools.javac.code.Kinds.Kind.*;
79 import static com.sun.tools.javac.code.TypeTag.*;
80 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
81 import static com.sun.tools.javac.tree.JCTree.Tag.*;
82 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final Symtab syms;
103 final Resolve rs;
104 final Operators operators;
105 final Infer infer;
106 final Analyzer analyzer;
107 final DeferredAttr deferredAttr;
108 final Check chk;
109 final Flow flow;
110 final MemberEnter memberEnter;
111 final TypeEnter typeEnter;
112 final TreeMaker make;
113 final ConstFold cfolder;
114 final Enter enter;
115 final Target target;
116 final Types types;
117 final Preview preview;
118 final JCDiagnostic.Factory diags;
119 final TypeAnnotations typeAnnotations;
120 final DeferredLintHandler deferredLintHandler;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127
128 public static Attr instance(Context context) {
129 Attr instance = context.get(attrKey);
130 if (instance == null)
131 instance = new Attr(context);
132 return instance;
133 }
134
135 protected Attr(Context context) {
136 context.put(attrKey, this);
137
138 names = Names.instance(context);
139 log = Log.instance(context);
140 syms = Symtab.instance(context);
141 rs = Resolve.instance(context);
142 operators = Operators.instance(context);
143 chk = Check.instance(context);
144 flow = Flow.instance(context);
145 memberEnter = MemberEnter.instance(context);
146 typeEnter = TypeEnter.instance(context);
147 make = TreeMaker.instance(context);
148 enter = Enter.instance(context);
149 infer = Infer.instance(context);
150 analyzer = Analyzer.instance(context);
151 deferredAttr = DeferredAttr.instance(context);
152 cfolder = ConstFold.instance(context);
153 target = Target.instance(context);
154 types = Types.instance(context);
155 preview = Preview.instance(context);
156 diags = JCDiagnostic.Factory.instance(context);
157 annotate = Annotate.instance(context);
158 typeAnnotations = TypeAnnotations.instance(context);
159 deferredLintHandler = DeferredLintHandler.instance(context);
160 typeEnvs = TypeEnvs.instance(context);
161 dependencies = Dependencies.instance(context);
162 argumentAttr = ArgumentAttr.instance(context);
163 matchBindingsComputer = MatchBindingsComputer.instance(context);
164 attrRecover = AttrRecover.instance(context);
165
166 Options options = Options.instance(context);
167
168 Source source = Source.instance(context);
169 allowPoly = Feature.POLY.allowedInSource(source);
170 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
171 allowLambda = Feature.LAMBDA.allowedInSource(source);
172 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
173 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
174 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source);
175 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
176 allowRecords = Feature.RECORDS.allowedInSource(source);
177 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
178 Feature.PATTERN_SWITCH.allowedInSource(source);
179 sourceName = source.name;
180 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
181
182 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
183 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
184 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
185 methodAttrInfo = new MethodAttrInfo();
186 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
187 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
188 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
189 }
190
191 /** Switch: support target-typing inference
192 */
193 boolean allowPoly;
194
195 /** Switch: support type annotations.
196 */
197 boolean allowTypeAnnos;
198
199 /** Switch: support lambda expressions ?
200 */
201 boolean allowLambda;
202
203 /** Switch: support default methods ?
204 */
205 boolean allowDefaultMethods;
206
207 /** Switch: allow primitive classes ?
208 */
209 boolean allowPrimitiveClasses;
210
211 /** Switch: static interface methods enabled?
212 */
213 boolean allowStaticInterfaceMethods;
214
215 /** Switch: reifiable types in instanceof enabled?
216 */
217 boolean allowReifiableTypesInInstanceof;
218
219 /** Are records allowed
220 */
221 private final boolean allowRecords;
222
223 /** Are patterns in switch allowed
224 */
225 private final boolean allowPatternSwitch;
226
227 /**
228 * Switch: warn about use of variable before declaration?
229 * RFE: 6425594
230 */
231 boolean useBeforeDeclarationWarning;
232
233 /**
234 * Switch: name of source level; used for error reporting.
235 */
236 String sourceName;
237
238 /** Check kind and type of given tree against protokind and prototype.
239 * If check succeeds, store type in tree and return it.
240 * If check fails, store errType in tree and return it.
241 * No checks are performed if the prototype is a method type.
242 * It is not necessary in this case since we know that kind and type
243 * are correct.
244 *
245 * @param tree The tree whose kind and type is checked
246 * @param found The computed type of the tree
247 * @param ownkind The computed kind of the tree
248 * @param resultInfo The expected result of the tree
249 */
250 Type check(final JCTree tree,
251 final Type found,
252 final KindSelector ownkind,
253 final ResultInfo resultInfo) {
254 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
255 Type owntype;
256 boolean shouldCheck = !found.hasTag(ERROR) &&
257 !resultInfo.pt.hasTag(METHOD) &&
258 !resultInfo.pt.hasTag(FORALL);
259 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
260 log.error(tree.pos(),
261 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
262 ownkind.kindNames()));
263 owntype = types.createErrorType(found);
264 } else if (allowPoly && inferenceContext.free(found)) {
265 //delay the check if there are inference variables in the found type
266 //this means we are dealing with a partially inferred poly expression
267 owntype = shouldCheck ? resultInfo.pt : found;
268 if (resultInfo.checkMode.installPostInferenceHook()) {
269 inferenceContext.addFreeTypeListener(List.of(found),
270 instantiatedContext -> {
271 ResultInfo pendingResult =
272 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
273 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
274 });
275 }
276 } else {
277 owntype = shouldCheck ?
278 resultInfo.check(tree, found) :
279 found;
280 }
281 if (resultInfo.checkMode.updateTreeType()) {
282 tree.type = owntype;
283 }
284 return owntype;
285 }
286
287 /** Is given blank final variable assignable, i.e. in a scope where it
288 * may be assigned to even though it is final?
289 * @param v The blank final variable.
290 * @param env The current environment.
291 */
292 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
293 Symbol owner = env.info.scope.owner;
294 // owner refers to the innermost variable, method or
295 // initializer block declaration at this point.
296 boolean isAssignable =
297 v.owner == owner
298 ||
299 ((owner.name == names.init || // i.e. we are in a constructor
300 owner.kind == VAR || // i.e. we are in a variable initializer
301 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
302 &&
303 v.owner == owner.owner
304 &&
305 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
306 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
307 return isAssignable & !insideCompactConstructor;
308 }
309
310 /** Check that variable can be assigned to.
311 * @param pos The current source code position.
312 * @param v The assigned variable
313 * @param base If the variable is referred to in a Select, the part
314 * to the left of the `.', null otherwise.
315 * @param env The current environment.
316 */
317 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
318 if (v.name == names._this) {
319 log.error(pos, Errors.CantAssignValToThis);
320 } else if ((v.flags() & FINAL) != 0 &&
321 ((v.flags() & HASINIT) != 0
322 ||
323 !((base == null ||
324 TreeInfo.isThisQualifier(base)) &&
325 isAssignableAsBlankFinal(v, env)))) {
326 if (v.isResourceVariable()) { //TWR resource
327 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
328 } else {
329 log.error(pos, Errors.CantAssignValToFinalVar(v));
330 }
331 }
332 }
333
334 /** Does tree represent a static reference to an identifier?
335 * It is assumed that tree is either a SELECT or an IDENT.
336 * We have to weed out selects from non-type names here.
337 * @param tree The candidate tree.
338 */
339 boolean isStaticReference(JCTree tree) {
340 if (tree.hasTag(SELECT)) {
341 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
342 if (lsym == null || lsym.kind != TYP) {
343 return false;
344 }
345 }
346 return true;
347 }
348
349 /** Is this symbol a type?
350 */
351 static boolean isType(Symbol sym) {
352 return sym != null && sym.kind == TYP;
353 }
354
355 /** The current `this' symbol.
356 * @param env The current environment.
357 */
358 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
359 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
360 }
361
362 /** Attribute a parsed identifier.
363 * @param tree Parsed identifier name
364 * @param topLevel The toplevel to use
365 */
366 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
367 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
368 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
369 syms.errSymbol.name,
370 null, null, null, null);
371 localEnv.enclClass.sym = syms.errSymbol;
372 return attribIdent(tree, localEnv);
373 }
374
375 /** Attribute a parsed identifier.
376 * @param tree Parsed identifier name
377 * @param env The env to use
378 */
379 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
380 return tree.accept(identAttributer, env);
381 }
382 // where
383 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
384 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
385 @Override @DefinedBy(Api.COMPILER_TREE)
386 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
387 Symbol site = visit(node.getExpression(), env);
388 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
389 return site;
390 Name name = (Name)node.getIdentifier();
391 if (site.kind == PCK) {
392 env.toplevel.packge = (PackageSymbol)site;
393 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
394 KindSelector.TYP_PCK);
395 } else {
396 env.enclClass.sym = (ClassSymbol)site;
397 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
398 }
399 }
400
401 @Override @DefinedBy(Api.COMPILER_TREE)
402 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
403 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
404 }
405 }
406
407 public Type coerce(Type etype, Type ttype) {
408 return cfolder.coerce(etype, ttype);
409 }
410
411 public Type attribType(JCTree node, TypeSymbol sym) {
412 Env<AttrContext> env = typeEnvs.get(sym);
413 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
414 return attribTree(node, localEnv, unknownTypeInfo);
415 }
416
417 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
418 // Attribute qualifying package or class.
419 JCFieldAccess s = (JCFieldAccess)tree.qualid;
420 return attribTree(s.selected, env,
421 new ResultInfo(tree.staticImport ?
422 KindSelector.TYP : KindSelector.TYP_PCK,
423 Type.noType));
424 }
425
426 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
427 return attribToTree(expr, env, tree, unknownExprInfo);
428 }
429
430 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
431 return attribToTree(stmt, env, tree, statInfo);
432 }
433
434 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
435 breakTree = tree;
436 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
437 try {
438 deferredAttr.attribSpeculative(root, env, resultInfo,
439 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
440 argumentAttr.withLocalCacheContext());
441 attrRecover.doRecovery();
442 } catch (BreakAttr b) {
443 return b.env;
444 } catch (AssertionError ae) {
445 if (ae.getCause() instanceof BreakAttr breakAttr) {
446 return breakAttr.env;
447 } else {
448 throw ae;
449 }
450 } finally {
451 breakTree = null;
452 log.useSource(prev);
453 }
454 return env;
455 }
456
457 private JCTree breakTree = null;
458
459 private static class BreakAttr extends RuntimeException {
460 static final long serialVersionUID = -6924771130405446405L;
461 private transient Env<AttrContext> env;
462 private BreakAttr(Env<AttrContext> env) {
463 this.env = env;
464 }
465 }
466
467 /**
468 * Mode controlling behavior of Attr.Check
469 */
470 enum CheckMode {
471
472 NORMAL,
473
474 /**
475 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
476 * that the captured var cache in {@code InferenceContext} will be used in read-only
477 * mode when performing inference checks.
478 */
479 NO_TREE_UPDATE {
480 @Override
481 public boolean updateTreeType() {
482 return false;
483 }
484 },
485 /**
486 * Mode signalling that caller will manage free types in tree decorations.
487 */
488 NO_INFERENCE_HOOK {
489 @Override
490 public boolean installPostInferenceHook() {
491 return false;
492 }
493 };
494
495 public boolean updateTreeType() {
496 return true;
497 }
498 public boolean installPostInferenceHook() {
499 return true;
500 }
501 }
502
503
504 class ResultInfo {
505 final KindSelector pkind;
506 final Type pt;
507 final CheckContext checkContext;
508 final CheckMode checkMode;
509
510 ResultInfo(KindSelector pkind, Type pt) {
511 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
512 }
513
514 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
515 this(pkind, pt, chk.basicHandler, checkMode);
516 }
517
518 protected ResultInfo(KindSelector pkind,
519 Type pt, CheckContext checkContext) {
520 this(pkind, pt, checkContext, CheckMode.NORMAL);
521 }
522
523 protected ResultInfo(KindSelector pkind,
524 Type pt, CheckContext checkContext, CheckMode checkMode) {
525 this.pkind = pkind;
526 this.pt = pt;
527 this.checkContext = checkContext;
528 this.checkMode = checkMode;
529 }
530
531 /**
532 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
533 * @param tree The tree to be type-checked.
534 * @return true if {@ArgumentAttr} should be used.
535 */
536 protected boolean needsArgumentAttr(JCTree tree) { return false; }
537
538 protected Type check(final DiagnosticPosition pos, final Type found) {
539 return chk.checkType(pos, found, pt, checkContext);
540 }
541
542 protected ResultInfo dup(Type newPt) {
543 return new ResultInfo(pkind, newPt, checkContext, checkMode);
544 }
545
546 protected ResultInfo dup(CheckContext newContext) {
547 return new ResultInfo(pkind, pt, newContext, checkMode);
548 }
549
550 protected ResultInfo dup(Type newPt, CheckContext newContext) {
551 return new ResultInfo(pkind, newPt, newContext, checkMode);
552 }
553
554 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
555 return new ResultInfo(pkind, newPt, newContext, newMode);
556 }
557
558 protected ResultInfo dup(CheckMode newMode) {
559 return new ResultInfo(pkind, pt, checkContext, newMode);
560 }
561
562 @Override
563 public String toString() {
564 if (pt != null) {
565 return pt.toString();
566 } else {
567 return "";
568 }
569 }
570 }
571
572 class MethodAttrInfo extends ResultInfo {
573 public MethodAttrInfo() {
574 this(chk.basicHandler);
575 }
576
577 public MethodAttrInfo(CheckContext checkContext) {
578 super(KindSelector.VAL, Infer.anyPoly, checkContext);
579 }
580
581 @Override
582 protected boolean needsArgumentAttr(JCTree tree) {
583 return true;
584 }
585
586 protected ResultInfo dup(Type newPt) {
587 throw new IllegalStateException();
588 }
589
590 protected ResultInfo dup(CheckContext newContext) {
591 return new MethodAttrInfo(newContext);
592 }
593
594 protected ResultInfo dup(Type newPt, CheckContext newContext) {
595 throw new IllegalStateException();
596 }
597
598 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
599 throw new IllegalStateException();
600 }
601
602 protected ResultInfo dup(CheckMode newMode) {
603 throw new IllegalStateException();
604 }
605 }
606
607 class RecoveryInfo extends ResultInfo {
608
609 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
610 this(deferredAttrContext, Type.recoveryType);
611 }
612
613 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
614 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
615 @Override
616 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
617 return deferredAttrContext;
618 }
619 @Override
620 public boolean compatible(Type found, Type req, Warner warn) {
621 return true;
622 }
623 @Override
624 public void report(DiagnosticPosition pos, JCDiagnostic details) {
625 boolean needsReport = pt == Type.recoveryType ||
626 (details.getDiagnosticPosition() != null &&
627 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
628 if (needsReport) {
629 chk.basicHandler.report(pos, details);
630 }
631 }
632 });
633 }
634 }
635
636 final ResultInfo statInfo;
637 final ResultInfo varAssignmentInfo;
638 final ResultInfo methodAttrInfo;
639 final ResultInfo unknownExprInfo;
640 final ResultInfo unknownTypeInfo;
641 final ResultInfo unknownTypeExprInfo;
642 final ResultInfo recoveryInfo;
643
644 Type pt() {
645 return resultInfo.pt;
646 }
647
648 KindSelector pkind() {
649 return resultInfo.pkind;
650 }
651
652 /* ************************************************************************
653 * Visitor methods
654 *************************************************************************/
655
656 /** Visitor argument: the current environment.
657 */
658 Env<AttrContext> env;
659
660 /** Visitor argument: the currently expected attribution result.
661 */
662 ResultInfo resultInfo;
663
664 /** Visitor result: the computed type.
665 */
666 Type result;
667
668 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
669
670 /** Visitor method: attribute a tree, catching any completion failure
671 * exceptions. Return the tree's type.
672 *
673 * @param tree The tree to be visited.
674 * @param env The environment visitor argument.
675 * @param resultInfo The result info visitor argument.
676 */
677 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
678 Env<AttrContext> prevEnv = this.env;
679 ResultInfo prevResult = this.resultInfo;
680 try {
681 this.env = env;
682 this.resultInfo = resultInfo;
683 if (resultInfo.needsArgumentAttr(tree)) {
684 result = argumentAttr.attribArg(tree, env);
685 } else {
686 tree.accept(this);
687 }
688 matchBindings = matchBindingsComputer.finishBindings(tree,
689 matchBindings);
690 if (tree == breakTree &&
691 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
692 breakTreeFound(copyEnv(env));
693 }
694 return result;
695 } catch (CompletionFailure ex) {
696 tree.type = syms.errType;
697 return chk.completionError(tree.pos(), ex);
698 } finally {
699 this.env = prevEnv;
700 this.resultInfo = prevResult;
701 }
702 }
703
704 protected void breakTreeFound(Env<AttrContext> env) {
705 throw new BreakAttr(env);
706 }
707
708 Env<AttrContext> copyEnv(Env<AttrContext> env) {
709 Env<AttrContext> newEnv =
710 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
711 if (newEnv.outer != null) {
712 newEnv.outer = copyEnv(newEnv.outer);
713 }
714 return newEnv;
715 }
716
717 WriteableScope copyScope(WriteableScope sc) {
718 WriteableScope newScope = WriteableScope.create(sc.owner);
719 List<Symbol> elemsList = List.nil();
720 for (Symbol sym : sc.getSymbols()) {
721 elemsList = elemsList.prepend(sym);
722 }
723 for (Symbol s : elemsList) {
724 newScope.enter(s);
725 }
726 return newScope;
727 }
728
729 /** Derived visitor method: attribute an expression tree.
730 */
731 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
732 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
733 }
734
735 /** Derived visitor method: attribute an expression tree with
736 * no constraints on the computed type.
737 */
738 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
739 return attribTree(tree, env, unknownExprInfo);
740 }
741
742 /** Derived visitor method: attribute a type tree.
743 */
744 public Type attribType(JCTree tree, Env<AttrContext> env) {
745 Type result = attribType(tree, env, Type.noType);
746 return result;
747 }
748
749 /** Derived visitor method: attribute a type tree.
750 */
751 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
752 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
753 return result;
754 }
755
756 /** Derived visitor method: attribute a statement or definition tree.
757 */
758 public Type attribStat(JCTree tree, Env<AttrContext> env) {
759 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
760 Type result = attribTree(tree, env, statInfo);
761 analyzer.analyzeIfNeeded(tree, analyzeEnv);
762 attrRecover.doRecovery();
763 return result;
764 }
765
766 /** Attribute a list of expressions, returning a list of types.
767 */
768 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
769 ListBuffer<Type> ts = new ListBuffer<>();
770 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
771 ts.append(attribExpr(l.head, env, pt));
772 return ts.toList();
773 }
774
775 /** Attribute a list of statements, returning nothing.
776 */
777 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
778 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
779 attribStat(l.head, env);
780 }
781
782 /** Attribute the arguments in a method call, returning the method kind.
783 */
784 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
785 KindSelector kind = initialKind;
786 for (JCExpression arg : trees) {
787 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
788 if (argtype.hasTag(DEFERRED)) {
789 kind = KindSelector.of(KindSelector.POLY, kind);
790 }
791 argtypes.append(argtype);
792 }
793 return kind;
794 }
795
796 /** Attribute a type argument list, returning a list of types.
797 * Caller is responsible for calling checkRefTypes.
798 */
799 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
800 ListBuffer<Type> argtypes = new ListBuffer<>();
801 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
802 argtypes.append(attribType(l.head, env));
803 return argtypes.toList();
804 }
805
806 /** Attribute a type argument list, returning a list of types.
807 * Check that all the types are references.
808 */
809 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
810 List<Type> types = attribAnyTypes(trees, env);
811 return chk.checkRefTypes(trees, types);
812 }
813
814 /**
815 * Attribute type variables (of generic classes or methods).
816 * Compound types are attributed later in attribBounds.
817 * @param typarams the type variables to enter
818 * @param env the current environment
819 */
820 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
821 for (JCTypeParameter tvar : typarams) {
822 TypeVar a = (TypeVar)tvar.type;
823 a.tsym.flags_field |= UNATTRIBUTED;
824 a.setUpperBound(Type.noType);
825 if (!tvar.bounds.isEmpty()) {
826 List<Type> bounds = List.of(chk.checkRefType(tvar.bounds.head, attribType(tvar.bounds.head, env), false));
827 for (JCExpression bound : tvar.bounds.tail)
828 bounds = bounds.prepend(chk.checkRefType(bound, attribType(bound, env), false));
829 types.setBounds(a, bounds.reverse());
830 } else {
831 // if no bounds are given, assume a single bound of
832 // java.lang.Object.
833 types.setBounds(a, List.of(syms.objectType));
834 }
835 a.tsym.flags_field &= ~UNATTRIBUTED;
836 }
837 if (checkCyclic) {
838 for (JCTypeParameter tvar : typarams) {
839 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
840 }
841 }
842 }
843
844 /**
845 * Attribute the type references in a list of annotations.
846 */
847 void attribAnnotationTypes(List<JCAnnotation> annotations,
848 Env<AttrContext> env) {
849 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
850 JCAnnotation a = al.head;
851 attribType(a.annotationType, env);
852 }
853 }
854
855 /**
856 * Attribute a "lazy constant value".
857 * @param env The env for the const value
858 * @param variable The initializer for the const value
859 * @param type The expected type, or null
860 * @see VarSymbol#setLazyConstValue
861 */
862 public Object attribLazyConstantValue(Env<AttrContext> env,
863 JCVariableDecl variable,
864 Type type) {
865
866 DiagnosticPosition prevLintPos
867 = deferredLintHandler.setPos(variable.pos());
868
869 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
870 try {
871 Type itype = attribExpr(variable.init, env, type);
872 if (variable.isImplicitlyTyped()) {
873 //fixup local variable type
874 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
875 }
876 if (itype.constValue() != null) {
877 return coerce(itype, type).constValue();
878 } else {
879 return null;
880 }
881 } finally {
882 log.useSource(prevSource);
883 deferredLintHandler.setPos(prevLintPos);
884 }
885 }
886
887 /** Attribute type reference in an `extends' or `implements' clause.
888 * Supertypes of anonymous inner classes are usually already attributed.
889 *
890 * @param tree The tree making up the type reference.
891 * @param env The environment current at the reference.
892 * @param classExpected true if only a class is expected here.
893 * @param interfaceExpected true if only an interface is expected here.
894 */
895 Type attribBase(JCTree tree,
896 Env<AttrContext> env,
897 boolean classExpected,
898 boolean interfaceExpected,
899 boolean checkExtensible) {
900 Type t = tree.type != null ?
901 tree.type :
902 attribType(tree, env);
903 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
904 }
905 Type checkBase(Type t,
906 JCTree tree,
907 Env<AttrContext> env,
908 boolean classExpected,
909 boolean interfaceExpected,
910 boolean checkExtensible) {
911 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
912 (((JCTypeApply) tree).clazz).pos() : tree.pos();
913 if (t.tsym.isAnonymous()) {
914 log.error(pos, Errors.CantInheritFromAnon);
915 return types.createErrorType(t);
916 }
917 if (t.isErroneous())
918 return t;
919 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
920 // check that type variable is already visible
921 if (t.getUpperBound() == null) {
922 log.error(pos, Errors.IllegalForwardRef);
923 return types.createErrorType(t);
924 }
925 } else {
926 t = chk.checkClassType(pos, t, checkExtensible);
927 }
928 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
929 log.error(pos, Errors.IntfExpectedHere);
930 // return errType is necessary since otherwise there might
931 // be undetected cycles which cause attribution to loop
932 return types.createErrorType(t);
933 } else if (checkExtensible &&
934 classExpected &&
935 (t.tsym.flags() & INTERFACE) != 0) {
936 log.error(pos, Errors.NoIntfExpectedHere);
937 return types.createErrorType(t);
938 }
939 if (checkExtensible &&
940 ((t.tsym.flags() & FINAL) != 0)) {
941 log.error(pos,
942 Errors.CantInheritFromFinal(t.tsym));
943 }
944 chk.checkNonCyclic(pos, t);
945 return t;
946 }
947
948 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
949 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
950 id.type = env.info.scope.owner.enclClass().type;
951 id.sym = env.info.scope.owner.enclClass();
952 return id.type;
953 }
954
955 public void visitClassDef(JCClassDecl tree) {
956 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
957 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
958 argumentAttr.withLocalCacheContext() : null);
959 try {
960 // Local and anonymous classes have not been entered yet, so we need to
961 // do it now.
962 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
963 enter.classEnter(tree, env);
964 } else {
965 // If this class declaration is part of a class level annotation,
966 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
967 // order to simplify later steps and allow for sensible error
968 // messages.
969 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
970 enter.classEnter(tree, env);
971 }
972
973 ClassSymbol c = tree.sym;
974 if (c == null) {
975 // exit in case something drastic went wrong during enter.
976 result = null;
977 } else {
978 // make sure class has been completed:
979 c.complete();
980
981 // If this class appears as an anonymous class
982 // in a superclass constructor call
983 // disable implicit outer instance from being passed.
984 // (This would be an illegal access to "this before super").
985 if (env.info.isSelfCall &&
986 env.tree.hasTag(NEWCLASS)) {
987 c.flags_field |= NOOUTERTHIS;
988 }
989 attribClass(tree.pos(), c);
990 result = tree.type = c.type;
991 }
992 } finally {
993 localCacheContext.ifPresent(LocalCacheContext::leave);
994 }
995 }
996
997 public void visitMethodDef(JCMethodDecl tree) {
998 MethodSymbol m = tree.sym;
999 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1000
1001 Lint lint = env.info.lint.augment(m);
1002 Lint prevLint = chk.setLint(lint);
1003 MethodSymbol prevMethod = chk.setMethod(m);
1004 try {
1005 deferredLintHandler.flush(tree.pos());
1006 chk.checkDeprecatedAnnotation(tree.pos(), m);
1007
1008
1009 // Create a new environment with local scope
1010 // for attributing the method.
1011 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1012 localEnv.info.lint = lint;
1013
1014 attribStats(tree.typarams, localEnv);
1015
1016 // If we override any other methods, check that we do so properly.
1017 // JLS ???
1018 if (m.isStatic()) {
1019 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1020 } else {
1021 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1022 }
1023 chk.checkOverride(env, tree, m);
1024
1025 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1026 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1027 }
1028
1029 // Enter all type parameters into the local method scope.
1030 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1031 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1032
1033 ClassSymbol owner = env.enclClass.sym;
1034 if ((owner.flags() & ANNOTATION) != 0 &&
1035 (tree.params.nonEmpty() ||
1036 tree.recvparam != null))
1037 log.error(tree.params.nonEmpty() ?
1038 tree.params.head.pos() :
1039 tree.recvparam.pos(),
1040 Errors.IntfAnnotationMembersCantHaveParams);
1041
1042 // Attribute all value parameters.
1043 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1044 attribStat(l.head, localEnv);
1045 }
1046
1047 chk.checkVarargsMethodDecl(localEnv, tree);
1048
1049 // Check that type parameters are well-formed.
1050 chk.validate(tree.typarams, localEnv);
1051
1052 // Check that result type is well-formed.
1053 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1054 chk.validate(tree.restype, localEnv);
1055
1056 // Check that receiver type is well-formed.
1057 if (tree.recvparam != null) {
1058 // Use a new environment to check the receiver parameter.
1059 // Otherwise I get "might not have been initialized" errors.
1060 // Is there a better way?
1061 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1062 attribType(tree.recvparam, newEnv);
1063 chk.validate(tree.recvparam, newEnv);
1064 }
1065
1066 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1067 // lets find if this method is an accessor
1068 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1069 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1070 if (recordComponent.isPresent()) {
1071 // the method is a user defined accessor lets check that everything is fine
1072 if (!tree.sym.isPublic()) {
1073 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1074 }
1075 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1076 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1077 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1078 }
1079 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1080 log.error(tree,
1081 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1082 }
1083 if (!tree.typarams.isEmpty()) {
1084 log.error(tree,
1085 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1086 }
1087 if (tree.sym.isStatic()) {
1088 log.error(tree,
1089 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1090 }
1091 }
1092
1093 if (tree.name == names.init) {
1094 // if this a constructor other than the canonical one
1095 if ((tree.sym.flags_field & RECORD) == 0) {
1096 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1097 if (app == null ||
1098 TreeInfo.name(app.meth) != names._this ||
1099 !checkFirstConstructorStat(app, tree, false)) {
1100 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1101 }
1102 } else {
1103 // but if it is the canonical:
1104
1105 /* if user generated, then it shouldn't:
1106 * - have an accessibility stricter than that of the record type
1107 * - explicitly invoke any other constructor
1108 */
1109 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1110 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1111 log.error(tree,
1112 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1113 Errors.InvalidCanonicalConstructorInRecord(
1114 Fragments.Canonical,
1115 env.enclClass.sym.name,
1116 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1117 ) :
1118 Errors.InvalidCanonicalConstructorInRecord(
1119 Fragments.Canonical,
1120 env.enclClass.sym.name,
1121 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1122 )
1123 );
1124 }
1125
1126 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1127 if (app != null &&
1128 (TreeInfo.name(app.meth) == names._this ||
1129 TreeInfo.name(app.meth) == names._super) &&
1130 checkFirstConstructorStat(app, tree, false)) {
1131 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1132 Fragments.Canonical, env.enclClass.sym.name,
1133 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1134 }
1135 }
1136
1137 // also we want to check that no type variables have been defined
1138 if (!tree.typarams.isEmpty()) {
1139 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1140 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1141 }
1142
1143 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1144 * record components
1145 */
1146 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1147 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1148 for (JCVariableDecl param: tree.params) {
1149 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1150 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1151 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1152 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1153 Fragments.Canonical, env.enclClass.sym.name,
1154 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1155 }
1156 recordComponents = recordComponents.tail;
1157 recordFieldTypes = recordFieldTypes.tail;
1158 }
1159 }
1160 }
1161 }
1162
1163 // annotation method checks
1164 if ((owner.flags() & ANNOTATION) != 0) {
1165 // annotation method cannot have throws clause
1166 if (tree.thrown.nonEmpty()) {
1167 log.error(tree.thrown.head.pos(),
1168 Errors.ThrowsNotAllowedInIntfAnnotation);
1169 }
1170 // annotation method cannot declare type-parameters
1171 if (tree.typarams.nonEmpty()) {
1172 log.error(tree.typarams.head.pos(),
1173 Errors.IntfAnnotationMembersCantHaveTypeParams);
1174 }
1175 // validate annotation method's return type (could be an annotation type)
1176 chk.validateAnnotationType(tree.restype);
1177 // ensure that annotation method does not clash with members of Object/Annotation
1178 chk.validateAnnotationMethod(tree.pos(), m);
1179 }
1180
1181 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1182 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1183
1184 if (tree.body == null) {
1185 // Empty bodies are only allowed for
1186 // abstract, native, or interface methods, or for methods
1187 // in a retrofit signature class.
1188 if (tree.defaultValue != null) {
1189 if ((owner.flags() & ANNOTATION) == 0)
1190 log.error(tree.pos(),
1191 Errors.DefaultAllowedInIntfAnnotationMember);
1192 }
1193 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1194 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1195 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1196 if ((owner.flags() & INTERFACE) != 0) {
1197 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1198 } else {
1199 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1200 }
1201 } else if ((tree.mods.flags & NATIVE) != 0) {
1202 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1203 } else {
1204 // Add an implicit super() call unless an explicit call to
1205 // super(...) or this(...) is given
1206 // or we are compiling class java.lang.Object.
1207 if (tree.name == names.init && owner.type != syms.objectType) {
1208 JCBlock body = tree.body;
1209 if (body.stats.isEmpty() ||
1210 TreeInfo.getConstructorInvocationName(body.stats, names, true) == names.empty) {
1211 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1212 make.Ident(names._super), make.Idents(List.nil())));
1213 body.stats = body.stats.prepend(supCall);
1214 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1215 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1216 TreeInfo.isSuperCall(body.stats.head)) {
1217 // enum constructors are not allowed to call super
1218 // directly, so make sure there aren't any super calls
1219 // in enum constructors, except in the compiler
1220 // generated one.
1221 log.error(tree.body.stats.head.pos(),
1222 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1223 } else if ((env.enclClass.sym.flags() & VALUE_CLASS) != 0 &&
1224 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1225 TreeInfo.isSuperCall(body.stats.head)) {
1226 // value constructors are not allowed to call super directly,
1227 // but tolerate compiler generated ones, these are ignored during code generation
1228 log.error(tree.body.stats.head.pos(), Errors.CallToSuperNotAllowedInValueCtor);
1229 }
1230 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1231 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1232 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1233 if (!initParamNames.equals(recordComponentNames)) {
1234 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1235 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1236 }
1237 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1238 log.error(tree,
1239 Errors.InvalidCanonicalConstructorInRecord(
1240 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1241 env.enclClass.sym.name,
1242 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1243 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1244 }
1245 }
1246 }
1247
1248 // Attribute all type annotations in the body
1249 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1250 annotate.flush();
1251
1252 // Attribute method body.
1253 attribStat(tree.body, localEnv);
1254 }
1255
1256 localEnv.info.scope.leave();
1257 result = tree.type = m.type;
1258 } finally {
1259 chk.setLint(prevLint);
1260 chk.setMethod(prevMethod);
1261 }
1262 }
1263
1264 public void visitVarDef(JCVariableDecl tree) {
1265 // Local variables have not been entered yet, so we need to do it now:
1266 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1267 if (tree.sym != null) {
1268 // parameters have already been entered
1269 env.info.scope.enter(tree.sym);
1270 } else {
1271 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1272 if (tree.init == null) {
1273 //cannot use 'var' without initializer
1274 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1275 tree.vartype = make.Erroneous();
1276 } else {
1277 Fragment msg = canInferLocalVarType(tree);
1278 if (msg != null) {
1279 //cannot use 'var' with initializer which require an explicit target
1280 //(e.g. lambda, method reference, array initializer).
1281 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1282 tree.vartype = make.Erroneous();
1283 }
1284 }
1285 }
1286 try {
1287 annotate.blockAnnotations();
1288 memberEnter.memberEnter(tree, env);
1289 } finally {
1290 annotate.unblockAnnotations();
1291 }
1292 }
1293 } else {
1294 if (tree.init != null) {
1295 // Field initializer expression need to be entered.
1296 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1297 annotate.flush();
1298 }
1299 }
1300
1301 VarSymbol v = tree.sym;
1302 Lint lint = env.info.lint.augment(v);
1303 Lint prevLint = chk.setLint(lint);
1304
1305 // Check that the variable's declared type is well-formed.
1306 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1307 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1308 (tree.sym.flags() & PARAMETER) != 0;
1309 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1310
1311 try {
1312 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1313 deferredLintHandler.flush(tree.pos());
1314 chk.checkDeprecatedAnnotation(tree.pos(), v);
1315
1316 /* Don't want constant propagation/folding for instance fields of primitive classes,
1317 as these can undergo updates via copy on write.
1318 */
1319 if (tree.init != null) {
1320 if ((v.flags_field & FINAL) == 0 || ((v.flags_field & STATIC) == 0 && v.owner.isValueClass()) ||
1321 !memberEnter.needsLazyConstValue(tree.init)) {
1322 // Not a compile-time constant
1323 // Attribute initializer in a new environment
1324 // with the declared variable as owner.
1325 // Check that initializer conforms to variable's declared type.
1326 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1327 initEnv.info.lint = lint;
1328 // In order to catch self-references, we set the variable's
1329 // declaration position to maximal possible value, effectively
1330 // marking the variable as undefined.
1331 initEnv.info.enclVar = v;
1332 attribExpr(tree.init, initEnv, v.type);
1333 if (tree.isImplicitlyTyped()) {
1334 //fixup local variable type
1335 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1336 }
1337 }
1338 if (tree.isImplicitlyTyped()) {
1339 setSyntheticVariableType(tree, v.type);
1340 }
1341 }
1342 result = tree.type = v.type;
1343 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1344 if (isNonArgsMethodInObject(v.name)) {
1345 log.error(tree, Errors.IllegalRecordComponentName(v));
1346 }
1347 }
1348 }
1349 finally {
1350 chk.setLint(prevLint);
1351 }
1352 }
1353
1354 private boolean isNonArgsMethodInObject(Name name) {
1355 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1356 if (s.type.getParameterTypes().isEmpty()) {
1357 return true;
1358 }
1359 }
1360 return false;
1361 }
1362
1363 Fragment canInferLocalVarType(JCVariableDecl tree) {
1364 LocalInitScanner lis = new LocalInitScanner();
1365 lis.scan(tree.init);
1366 return lis.badInferenceMsg;
1367 }
1368
1369 static class LocalInitScanner extends TreeScanner {
1370 Fragment badInferenceMsg = null;
1371 boolean needsTarget = true;
1372
1373 @Override
1374 public void visitNewArray(JCNewArray tree) {
1375 if (tree.elemtype == null && needsTarget) {
1376 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1377 }
1378 }
1379
1380 @Override
1381 public void visitLambda(JCLambda tree) {
1382 if (needsTarget) {
1383 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1384 }
1385 }
1386
1387 @Override
1388 public void visitTypeCast(JCTypeCast tree) {
1389 boolean prevNeedsTarget = needsTarget;
1390 try {
1391 needsTarget = false;
1392 super.visitTypeCast(tree);
1393 } finally {
1394 needsTarget = prevNeedsTarget;
1395 }
1396 }
1397
1398 @Override
1399 public void visitReference(JCMemberReference tree) {
1400 if (needsTarget) {
1401 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1402 }
1403 }
1404
1405 @Override
1406 public void visitNewClass(JCNewClass tree) {
1407 boolean prevNeedsTarget = needsTarget;
1408 try {
1409 needsTarget = false;
1410 super.visitNewClass(tree);
1411 } finally {
1412 needsTarget = prevNeedsTarget;
1413 }
1414 }
1415
1416 @Override
1417 public void visitApply(JCMethodInvocation tree) {
1418 boolean prevNeedsTarget = needsTarget;
1419 try {
1420 needsTarget = false;
1421 super.visitApply(tree);
1422 } finally {
1423 needsTarget = prevNeedsTarget;
1424 }
1425 }
1426 }
1427
1428 public void visitSkip(JCSkip tree) {
1429 result = null;
1430 }
1431
1432 public void visitBlock(JCBlock tree) {
1433 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1434 // Block is a static or instance initializer;
1435 // let the owner of the environment be a freshly
1436 // created BLOCK-method.
1437 Symbol fakeOwner =
1438 new MethodSymbol(tree.flags | BLOCK |
1439 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1440 env.info.scope.owner);
1441 final Env<AttrContext> localEnv =
1442 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1443
1444 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1445 // Attribute all type annotations in the block
1446 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1447 annotate.flush();
1448 attribStats(tree.stats, localEnv);
1449
1450 {
1451 // Store init and clinit type annotations with the ClassSymbol
1452 // to allow output in Gen.normalizeDefs.
1453 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1454 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1455 if ((tree.flags & STATIC) != 0) {
1456 cs.appendClassInitTypeAttributes(tas);
1457 } else {
1458 cs.appendInitTypeAttributes(tas);
1459 }
1460 }
1461 } else {
1462 // Create a new local environment with a local scope.
1463 Env<AttrContext> localEnv =
1464 env.dup(tree, env.info.dup(env.info.scope.dup()));
1465 try {
1466 attribStats(tree.stats, localEnv);
1467 } finally {
1468 localEnv.info.scope.leave();
1469 }
1470 }
1471 result = null;
1472 }
1473
1474 public void visitDoLoop(JCDoWhileLoop tree) {
1475 attribStat(tree.body, env.dup(tree));
1476 attribExpr(tree.cond, env, syms.booleanType);
1477 if (!breaksOutOf(tree, tree.body)) {
1478 //include condition's body when false after the while, if cannot get out of the loop
1479 MatchBindings condBindings = matchBindings;
1480 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1481 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1482 }
1483 result = null;
1484 }
1485
1486 public void visitWhileLoop(JCWhileLoop tree) {
1487 attribExpr(tree.cond, env, syms.booleanType);
1488 MatchBindings condBindings = matchBindings;
1489 // include condition's bindings when true in the body:
1490 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1491 try {
1492 attribStat(tree.body, whileEnv.dup(tree));
1493 } finally {
1494 whileEnv.info.scope.leave();
1495 }
1496 if (!breaksOutOf(tree, tree.body)) {
1497 //include condition's bindings when false after the while, if cannot get out of the loop
1498 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1499 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1500 }
1501 result = null;
1502 }
1503
1504 private boolean breaksOutOf(JCTree loop, JCTree body) {
1505 preFlow(body);
1506 return flow.breaksOutOf(env, loop, body, make);
1507 }
1508
1509 public void visitForLoop(JCForLoop tree) {
1510 Env<AttrContext> loopEnv =
1511 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1512 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1513 try {
1514 attribStats(tree.init, loopEnv);
1515 if (tree.cond != null) {
1516 attribExpr(tree.cond, loopEnv, syms.booleanType);
1517 // include condition's bindings when true in the body and step:
1518 condBindings = matchBindings;
1519 }
1520 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1521 try {
1522 bodyEnv.tree = tree; // before, we were not in loop!
1523 attribStats(tree.step, bodyEnv);
1524 attribStat(tree.body, bodyEnv);
1525 } finally {
1526 bodyEnv.info.scope.leave();
1527 }
1528 result = null;
1529 }
1530 finally {
1531 loopEnv.info.scope.leave();
1532 }
1533 if (!breaksOutOf(tree, tree.body)) {
1534 //include condition's body when false after the while, if cannot get out of the loop
1535 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1536 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1537 }
1538 }
1539
1540 public void visitForeachLoop(JCEnhancedForLoop tree) {
1541 Env<AttrContext> loopEnv =
1542 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1543 try {
1544 //the Formal Parameter of a for-each loop is not in the scope when
1545 //attributing the for-each expression; we mimic this by attributing
1546 //the for-each expression first (against original scope).
1547 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1548 chk.checkNonVoid(tree.pos(), exprType);
1549 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1550 if (elemtype == null) {
1551 // or perhaps expr implements Iterable<T>?
1552 Type base = types.asSuper(exprType.referenceProjectionOrSelf(), syms.iterableType.tsym);
1553 if (base == null) {
1554 log.error(tree.expr.pos(),
1555 Errors.ForeachNotApplicableToType(exprType,
1556 Fragments.TypeReqArrayOrIterable));
1557 elemtype = types.createErrorType(exprType);
1558 } else {
1559 List<Type> iterableParams = base.allparams();
1560 elemtype = iterableParams.isEmpty()
1561 ? syms.objectType
1562 : types.wildUpperBound(iterableParams.head);
1563
1564 // Check the return type of the method iterator().
1565 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1566 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1567 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1568 if (types.asSuper(iterSymbol.type.getReturnType().referenceProjectionOrSelf(), syms.iteratorType.tsym) == null) {
1569 log.error(tree.pos(),
1570 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1571 }
1572 }
1573 }
1574 if (tree.var.isImplicitlyTyped()) {
1575 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1576 setSyntheticVariableType(tree.var, inferredType);
1577 }
1578 attribStat(tree.var, loopEnv);
1579 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1580 loopEnv.tree = tree; // before, we were not in loop!
1581 attribStat(tree.body, loopEnv);
1582 result = null;
1583 }
1584 finally {
1585 loopEnv.info.scope.leave();
1586 }
1587 }
1588
1589 public void visitLabelled(JCLabeledStatement tree) {
1590 // Check that label is not used in an enclosing statement
1591 Env<AttrContext> env1 = env;
1592 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1593 if (env1.tree.hasTag(LABELLED) &&
1594 ((JCLabeledStatement) env1.tree).label == tree.label) {
1595 log.error(tree.pos(),
1596 Errors.LabelAlreadyInUse(tree.label));
1597 break;
1598 }
1599 env1 = env1.next;
1600 }
1601
1602 attribStat(tree.body, env.dup(tree));
1603 result = null;
1604 }
1605
1606 public void visitSwitch(JCSwitch tree) {
1607 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1608 attribStats(c.stats, caseEnv);
1609 });
1610 result = null;
1611 }
1612
1613 public void visitSwitchExpression(JCSwitchExpression tree) {
1614 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1615 PolyKind.STANDALONE : PolyKind.POLY;
1616
1617 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1618 //this means we are returning a poly conditional from void-compatible lambda expression
1619 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1620 result = tree.type = types.createErrorType(resultInfo.pt);
1621 return;
1622 }
1623
1624 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1625 unknownExprInfo :
1626 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1627
1628 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1629 ListBuffer<Type> caseTypes = new ListBuffer<>();
1630
1631 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1632 caseEnv.info.yieldResult = condInfo;
1633 attribStats(c.stats, caseEnv);
1634 new TreeScanner() {
1635 @Override
1636 public void visitYield(JCYield brk) {
1637 if (brk.target == tree) {
1638 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1639 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1640 }
1641 super.visitYield(brk);
1642 }
1643
1644 @Override public void visitClassDef(JCClassDecl tree) {}
1645 @Override public void visitLambda(JCLambda tree) {}
1646 }.scan(c.stats);
1647 });
1648
1649 if (tree.cases.isEmpty()) {
1650 log.error(tree.pos(),
1651 Errors.SwitchExpressionEmpty);
1652 } else if (caseTypes.isEmpty()) {
1653 log.error(tree.pos(),
1654 Errors.SwitchExpressionNoResultExpressions);
1655 }
1656
1657 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1658
1659 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1660 }
1661 //where:
1662 CheckContext switchExpressionContext(CheckContext checkContext) {
1663 return new Check.NestedCheckContext(checkContext) {
1664 //this will use enclosing check context to check compatibility of
1665 //subexpression against target type; if we are in a method check context,
1666 //depending on whether boxing is allowed, we could have incompatibilities
1667 @Override
1668 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1669 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1670 }
1671 };
1672 }
1673
1674 private void handleSwitch(JCTree switchTree,
1675 JCExpression selector,
1676 List<JCCase> cases,
1677 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1678 Type seltype = attribExpr(selector, env);
1679
1680 Env<AttrContext> switchEnv =
1681 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1682
1683 try {
1684 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1685 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1686 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1687 boolean patternSwitch;
1688 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1689 !types.isAssignable(seltype, syms.intType)) {
1690 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1691 patternSwitch = true;
1692 } else {
1693 patternSwitch = cases.stream()
1694 .flatMap(c -> c.labels.stream())
1695 .anyMatch(l -> l.isPattern());
1696 }
1697
1698 // Attribute all cases and
1699 // check that there are no duplicate case labels or default clauses.
1700 Set<Object> labels = new HashSet<>(); // The set of case labels.
1701 List<Type> coveredTypesForPatterns = List.nil();
1702 List<Type> coveredTypesForConstants = List.nil();
1703 boolean hasDefault = false; // Is there a default label?
1704 boolean hasTotalPattern = false; // Is there a total pattern?
1705 boolean hasNullPattern = false; // Is there a null pattern?
1706 CaseTree.CaseKind caseKind = null;
1707 boolean wasError = false;
1708 MatchBindings prevBindings = null;
1709 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1710 JCCase c = l.head;
1711 if (caseKind == null) {
1712 caseKind = c.caseKind;
1713 } else if (caseKind != c.caseKind && !wasError) {
1714 log.error(c.pos(),
1715 Errors.SwitchMixingCaseTypes);
1716 wasError = true;
1717 }
1718 MatchBindings currentBindings = prevBindings;
1719 boolean wasTotalPattern = hasTotalPattern;
1720 for (JCCaseLabel pat : c.labels) {
1721 if (pat.isExpression()) {
1722 JCExpression expr = (JCExpression) pat;
1723 if (TreeInfo.isNull(expr)) {
1724 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1725 if (hasNullPattern) {
1726 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1727 } else if (wasTotalPattern) {
1728 log.error(pat.pos(), Errors.PatternDominated);
1729 }
1730 hasNullPattern = true;
1731 attribExpr(expr, switchEnv, seltype);
1732 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1733 } else if (enumSwitch) {
1734 Symbol sym = enumConstant(expr, seltype);
1735 if (sym == null) {
1736 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1737 } else if (!labels.add(sym)) {
1738 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1739 } else {
1740 checkCaseLabelDominated(pat.pos(), coveredTypesForConstants, sym.type);
1741 }
1742 } else if (errorEnumSwitch) {
1743 //error recovery: the selector is erroneous, and all the case labels
1744 //are identifiers. This could be an enum switch - don't report resolve
1745 //error for the case label:
1746 var prevResolveHelper = rs.basicLogResolveHelper;
1747 try {
1748 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1749 attribExpr(pat, switchEnv, seltype);
1750 } finally {
1751 rs.basicLogResolveHelper = prevResolveHelper;
1752 }
1753 } else {
1754 ResultInfo valTypInfo = new ResultInfo(KindSelector.VAL_TYP,
1755 !seltype.hasTag(ERROR) ? seltype
1756 : Type.noType);
1757 Type pattype = attribTree(expr, switchEnv, valTypInfo);
1758 if (!pattype.hasTag(ERROR)) {
1759 if (pattype.constValue() == null) {
1760 Symbol s = TreeInfo.symbol(expr);
1761 if (s != null && s.kind == TYP && allowPatternSwitch) {
1762 log.error(expr.pos(),
1763 Errors.PatternExpected);
1764 } else {
1765 log.error(expr.pos(),
1766 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1767 }
1768 } else if (!stringSwitch && !types.isAssignable(seltype, syms.intType)) {
1769 log.error(pat.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1770 } else if (!labels.add(pattype.constValue())) {
1771 log.error(c.pos(), Errors.DuplicateCaseLabel);
1772 } else {
1773 checkCaseLabelDominated(pat.pos(), coveredTypesForConstants, types.boxedTypeOrType(pattype));
1774 }
1775 }
1776 }
1777 } else if (pat.hasTag(DEFAULTCASELABEL)) {
1778 if (hasDefault) {
1779 log.error(pat.pos(), Errors.DuplicateDefaultLabel);
1780 } else if (hasTotalPattern) {
1781 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1782 }
1783 hasDefault = true;
1784 matchBindings = MatchBindingsComputer.EMPTY;
1785 } else {
1786 //binding pattern
1787 attribExpr(pat, switchEnv);
1788 var primary = TreeInfo.primaryPatternType((JCPattern) pat);
1789 Type primaryType = primary.type();
1790 if (!primaryType.hasTag(TYPEVAR)) {
1791 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1792 }
1793 checkCastablePattern(pat.pos(), seltype, primaryType);
1794 Type patternType = types.erasure(primaryType);
1795 boolean isTotal = primary.unconditional() &&
1796 !patternType.isErroneous() &&
1797 types.isSubtype(types.erasure(seltype), patternType);
1798 if (isTotal) {
1799 if (hasTotalPattern) {
1800 log.error(pat.pos(), Errors.DuplicateTotalPattern);
1801 } else if (hasDefault) {
1802 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1803 }
1804 hasTotalPattern = true;
1805 }
1806 checkCaseLabelDominated(pat.pos(), coveredTypesForPatterns, patternType);
1807 if (!patternType.isErroneous()) {
1808 coveredTypesForConstants = coveredTypesForConstants.prepend(patternType);
1809 if (primary.unconditional()) {
1810 coveredTypesForPatterns = coveredTypesForPatterns.prepend(patternType);
1811 }
1812 }
1813 }
1814 currentBindings = matchBindingsComputer.switchCase(pat, currentBindings, matchBindings);
1815 }
1816 Env<AttrContext> caseEnv =
1817 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1818 try {
1819 attribCase.accept(c, caseEnv);
1820 } finally {
1821 caseEnv.info.scope.leave();
1822 }
1823 addVars(c.stats, switchEnv.info.scope);
1824
1825 preFlow(c);
1826 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1827
1828 prevBindings = c.caseKind == CaseTree.CaseKind.STATEMENT && c.completesNormally ? currentBindings
1829 : null;
1830 }
1831 if (patternSwitch) {
1832 chk.checkSwitchCaseStructure(cases);
1833 }
1834 if (switchTree.hasTag(SWITCH)) {
1835 ((JCSwitch) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1836 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1837 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1838 ((JCSwitchExpression) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1839 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1840 } else {
1841 Assert.error(switchTree.getTag().name());
1842 }
1843 } finally {
1844 switchEnv.info.scope.leave();
1845 }
1846 }
1847 // where
1848 /** Add any variables defined in stats to the switch scope. */
1849 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1850 for (;stats.nonEmpty(); stats = stats.tail) {
1851 JCTree stat = stats.head;
1852 if (stat.hasTag(VARDEF))
1853 switchScope.enter(((JCVariableDecl) stat).sym);
1854 }
1855 }
1856 private void checkCaseLabelDominated(DiagnosticPosition pos,
1857 List<Type> coveredTypes, Type patternType) {
1858 for (Type existing : coveredTypes) {
1859 if (types.isSubtype(patternType, existing)) {
1860 log.error(pos, Errors.PatternDominated);
1861 }
1862 }
1863 }
1864 // where
1865 /** Return the selected enumeration constant symbol, or null. */
1866 private Symbol enumConstant(JCTree tree, Type enumType) {
1867 if (tree.hasTag(IDENT)) {
1868 JCIdent ident = (JCIdent)tree;
1869 Name name = ident.name;
1870 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1871 if (sym.kind == VAR) {
1872 Symbol s = ident.sym = sym;
1873 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1874 ident.type = s.type;
1875 return ((s.flags_field & Flags.ENUM) == 0)
1876 ? null : s;
1877 }
1878 }
1879 }
1880 return null;
1881 }
1882
1883 public void visitSynchronized(JCSynchronized tree) {
1884 chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1885 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1886 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1887 }
1888 attribStat(tree.body, env);
1889 result = null;
1890 }
1891 // where
1892 private boolean isValueBased(Type t) {
1893 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1894 }
1895
1896
1897 public void visitTry(JCTry tree) {
1898 // Create a new local environment with a local
1899 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1900 try {
1901 boolean isTryWithResource = tree.resources.nonEmpty();
1902 // Create a nested environment for attributing the try block if needed
1903 Env<AttrContext> tryEnv = isTryWithResource ?
1904 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1905 localEnv;
1906 try {
1907 // Attribute resource declarations
1908 for (JCTree resource : tree.resources) {
1909 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1910 @Override
1911 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1912 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1913 }
1914 };
1915 ResultInfo twrResult =
1916 new ResultInfo(KindSelector.VAR,
1917 syms.autoCloseableType,
1918 twrContext);
1919 if (resource.hasTag(VARDEF)) {
1920 attribStat(resource, tryEnv);
1921 twrResult.check(resource, resource.type);
1922
1923 //check that resource type cannot throw InterruptedException
1924 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1925
1926 VarSymbol var = ((JCVariableDecl) resource).sym;
1927 var.setData(ElementKind.RESOURCE_VARIABLE);
1928 } else {
1929 attribTree(resource, tryEnv, twrResult);
1930 }
1931 }
1932 // Attribute body
1933 attribStat(tree.body, tryEnv);
1934 } finally {
1935 if (isTryWithResource)
1936 tryEnv.info.scope.leave();
1937 }
1938
1939 // Attribute catch clauses
1940 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1941 JCCatch c = l.head;
1942 Env<AttrContext> catchEnv =
1943 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1944 try {
1945 Type ctype = attribStat(c.param, catchEnv);
1946 if (TreeInfo.isMultiCatch(c)) {
1947 //multi-catch parameter is implicitly marked as final
1948 c.param.sym.flags_field |= FINAL | UNION;
1949 }
1950 if (c.param.sym.kind == VAR) {
1951 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1952 }
1953 chk.checkType(c.param.vartype.pos(),
1954 chk.checkClassType(c.param.vartype.pos(), ctype),
1955 syms.throwableType);
1956 attribStat(c.body, catchEnv);
1957 } finally {
1958 catchEnv.info.scope.leave();
1959 }
1960 }
1961
1962 // Attribute finalizer
1963 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1964 result = null;
1965 }
1966 finally {
1967 localEnv.info.scope.leave();
1968 }
1969 }
1970
1971 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1972 if (!resource.isErroneous() &&
1973 types.asSuper(resource.referenceProjectionOrSelf(), syms.autoCloseableType.tsym) != null &&
1974 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1975 Symbol close = syms.noSymbol;
1976 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1977 try {
1978 close = rs.resolveQualifiedMethod(pos,
1979 env,
1980 types.skipTypeVars(resource, false),
1981 names.close,
1982 List.nil(),
1983 List.nil());
1984 }
1985 finally {
1986 log.popDiagnosticHandler(discardHandler);
1987 }
1988 if (close.kind == MTH &&
1989 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1990 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1991 env.info.lint.isEnabled(LintCategory.TRY)) {
1992 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1993 }
1994 }
1995 }
1996
1997 public void visitConditional(JCConditional tree) {
1998 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1999 MatchBindings condBindings = matchBindings;
2000
2001 tree.polyKind = (!allowPoly ||
2002 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2003 isBooleanOrNumeric(env, tree)) ?
2004 PolyKind.STANDALONE : PolyKind.POLY;
2005
2006 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2007 //this means we are returning a poly conditional from void-compatible lambda expression
2008 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2009 result = tree.type = types.createErrorType(resultInfo.pt);
2010 return;
2011 }
2012
2013 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2014 unknownExprInfo :
2015 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2016
2017
2018 // x ? y : z
2019 // include x's bindings when true in y
2020 // include x's bindings when false in z
2021
2022 Type truetype;
2023 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2024 try {
2025 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2026 } finally {
2027 trueEnv.info.scope.leave();
2028 }
2029
2030 MatchBindings trueBindings = matchBindings;
2031
2032 Type falsetype;
2033 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2034 try {
2035 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2036 } finally {
2037 falseEnv.info.scope.leave();
2038 }
2039
2040 MatchBindings falseBindings = matchBindings;
2041
2042 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2043 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2044 List.of(truetype, falsetype)) : pt();
2045 if (condtype.constValue() != null &&
2046 truetype.constValue() != null &&
2047 falsetype.constValue() != null &&
2048 !owntype.hasTag(NONE)) {
2049 //constant folding
2050 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2051 }
2052 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2053 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2054 }
2055 //where
2056 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2057 switch (tree.getTag()) {
2058 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2059 ((JCLiteral)tree).typetag == BOOLEAN ||
2060 ((JCLiteral)tree).typetag == BOT;
2061 case LAMBDA: case REFERENCE: return false;
2062 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2063 case CONDEXPR:
2064 JCConditional condTree = (JCConditional)tree;
2065 return isBooleanOrNumeric(env, condTree.truepart) &&
2066 isBooleanOrNumeric(env, condTree.falsepart);
2067 case APPLY:
2068 JCMethodInvocation speculativeMethodTree =
2069 (JCMethodInvocation)deferredAttr.attribSpeculative(
2070 tree, env, unknownExprInfo,
2071 argumentAttr.withLocalCacheContext());
2072 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2073 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2074 env.enclClass.type :
2075 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2076 Type owntype = types.memberType(receiverType, msym).getReturnType();
2077 return primitiveOrBoxed(owntype);
2078 case NEWCLASS:
2079 JCExpression className =
2080 removeClassParams.translate(((JCNewClass)tree).clazz);
2081 JCExpression speculativeNewClassTree =
2082 (JCExpression)deferredAttr.attribSpeculative(
2083 className, env, unknownTypeInfo,
2084 argumentAttr.withLocalCacheContext());
2085 return primitiveOrBoxed(speculativeNewClassTree.type);
2086 default:
2087 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2088 argumentAttr.withLocalCacheContext()).type;
2089 return primitiveOrBoxed(speculativeType);
2090 }
2091 }
2092 //where
2093 boolean primitiveOrBoxed(Type t) {
2094 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2095 }
2096
2097 TreeTranslator removeClassParams = new TreeTranslator() {
2098 @Override
2099 public void visitTypeApply(JCTypeApply tree) {
2100 result = translate(tree.clazz);
2101 }
2102 };
2103
2104 CheckContext conditionalContext(CheckContext checkContext) {
2105 return new Check.NestedCheckContext(checkContext) {
2106 //this will use enclosing check context to check compatibility of
2107 //subexpression against target type; if we are in a method check context,
2108 //depending on whether boxing is allowed, we could have incompatibilities
2109 @Override
2110 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2111 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2112 }
2113 };
2114 }
2115
2116 /** Compute the type of a conditional expression, after
2117 * checking that it exists. See JLS 15.25. Does not take into
2118 * account the special case where condition and both arms
2119 * are constants.
2120 *
2121 * @param pos The source position to be used for error
2122 * diagnostics.
2123 * @param thentype The type of the expression's then-part.
2124 * @param elsetype The type of the expression's else-part.
2125 */
2126 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2127 if (condTypes.isEmpty()) {
2128 return syms.objectType; //TODO: how to handle?
2129 }
2130 Type first = condTypes.head;
2131 // If same type, that is the result
2132 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2133 return first.baseType();
2134
2135 List<Type> unboxedTypes = condTypes.stream()
2136 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2137 .collect(List.collector());
2138
2139 // Otherwise, if both arms can be converted to a numeric
2140 // type, return the least numeric type that fits both arms
2141 // (i.e. return larger of the two, or return int if one
2142 // arm is short, the other is char).
2143 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2144 // If one arm has an integer subrange type (i.e., byte,
2145 // short, or char), and the other is an integer constant
2146 // that fits into the subrange, return the subrange type.
2147 for (Type type : unboxedTypes) {
2148 if (!type.getTag().isStrictSubRangeOf(INT)) {
2149 continue;
2150 }
2151 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2152 return type.baseType();
2153 }
2154
2155 for (TypeTag tag : primitiveTags) {
2156 Type candidate = syms.typeOfTag[tag.ordinal()];
2157 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2158 return candidate;
2159 }
2160 }
2161 }
2162
2163 // Those were all the cases that could result in a primitive. See if primitive boxing and primitive
2164 // value conversions bring about a convergence.
2165 condTypes = condTypes.stream()
2166 .map(t -> t.isPrimitive() ? types.boxedClass(t).type
2167 : t.isReferenceProjection() ? t.valueProjection() : t)
2168 .collect(List.collector());
2169
2170 for (Type type : condTypes) {
2171 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2172 return type.baseType();
2173 }
2174
2175 Iterator<DiagnosticPosition> posIt = positions.iterator();
2176
2177 condTypes = condTypes.stream()
2178 .map(t -> chk.checkNonVoid(posIt.next(), t.isPrimitiveClass() ? t.referenceProjection() : t))
2179 .collect(List.collector());
2180
2181 // both are known to be reference types (or projections). The result is
2182 // lub(thentype,elsetype). This cannot fail, as it will
2183 // always be possible to infer "Object" if nothing better.
2184 return types.lub(condTypes.stream()
2185 .map(t -> t.baseType())
2186 .filter(t -> !t.hasTag(BOT))
2187 .collect(List.collector()));
2188 }
2189
2190 static final TypeTag[] primitiveTags = new TypeTag[]{
2191 BYTE,
2192 CHAR,
2193 SHORT,
2194 INT,
2195 LONG,
2196 FLOAT,
2197 DOUBLE,
2198 BOOLEAN,
2199 };
2200
2201 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2202 return bindingEnv(env, env.tree, bindings);
2203 }
2204
2205 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2206 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2207 bindings.forEach(env1.info.scope::enter);
2208 return env1;
2209 }
2210
2211 public void visitIf(JCIf tree) {
2212 attribExpr(tree.cond, env, syms.booleanType);
2213
2214 // if (x) { y } [ else z ]
2215 // include x's bindings when true in y
2216 // include x's bindings when false in z
2217
2218 MatchBindings condBindings = matchBindings;
2219 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2220
2221 try {
2222 attribStat(tree.thenpart, thenEnv);
2223 } finally {
2224 thenEnv.info.scope.leave();
2225 }
2226
2227 preFlow(tree.thenpart);
2228 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2229 boolean aliveAfterElse;
2230
2231 if (tree.elsepart != null) {
2232 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2233 try {
2234 attribStat(tree.elsepart, elseEnv);
2235 } finally {
2236 elseEnv.info.scope.leave();
2237 }
2238 preFlow(tree.elsepart);
2239 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2240 } else {
2241 aliveAfterElse = true;
2242 }
2243
2244 chk.checkEmptyIf(tree);
2245
2246 List<BindingSymbol> afterIfBindings = List.nil();
2247
2248 if (aliveAfterThen && !aliveAfterElse) {
2249 afterIfBindings = condBindings.bindingsWhenTrue;
2250 } else if (aliveAfterElse && !aliveAfterThen) {
2251 afterIfBindings = condBindings.bindingsWhenFalse;
2252 }
2253
2254 afterIfBindings.forEach(env.info.scope::enter);
2255 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2256
2257 result = null;
2258 }
2259
2260 void preFlow(JCTree tree) {
2261 attrRecover.doRecovery();
2262 new PostAttrAnalyzer() {
2263 @Override
2264 public void scan(JCTree tree) {
2265 if (tree == null ||
2266 (tree.type != null &&
2267 tree.type == Type.stuckType)) {
2268 //don't touch stuck expressions!
2269 return;
2270 }
2271 super.scan(tree);
2272 }
2273
2274 @Override
2275 public void visitClassDef(JCClassDecl that) {
2276 if (that.sym != null) {
2277 // Method preFlow shouldn't visit class definitions
2278 // that have not been entered and attributed.
2279 // See JDK-8254557 and JDK-8203277 for more details.
2280 super.visitClassDef(that);
2281 }
2282 }
2283
2284 @Override
2285 public void visitLambda(JCLambda that) {
2286 if (that.type != null) {
2287 // Method preFlow shouldn't visit lambda expressions
2288 // that have not been entered and attributed.
2289 // See JDK-8254557 and JDK-8203277 for more details.
2290 super.visitLambda(that);
2291 }
2292 }
2293 }.scan(tree);
2294 }
2295
2296 public void visitExec(JCExpressionStatement tree) {
2297 //a fresh environment is required for 292 inference to work properly ---
2298 //see Infer.instantiatePolymorphicSignatureInstance()
2299 Env<AttrContext> localEnv = env.dup(tree);
2300 attribExpr(tree.expr, localEnv);
2301 result = null;
2302 }
2303
2304 public void visitBreak(JCBreak tree) {
2305 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2306 result = null;
2307 }
2308
2309 public void visitYield(JCYield tree) {
2310 if (env.info.yieldResult != null) {
2311 attribTree(tree.value, env, env.info.yieldResult);
2312 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2313 } else {
2314 log.error(tree.pos(), tree.value.hasTag(PARENS)
2315 ? Errors.NoSwitchExpressionQualify
2316 : Errors.NoSwitchExpression);
2317 attribTree(tree.value, env, unknownExprInfo);
2318 }
2319 result = null;
2320 }
2321
2322 public void visitContinue(JCContinue tree) {
2323 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2324 result = null;
2325 }
2326 //where
2327 /** Return the target of a break, continue or yield statement,
2328 * if it exists, report an error if not.
2329 * Note: The target of a labelled break or continue is the
2330 * (non-labelled) statement tree referred to by the label,
2331 * not the tree representing the labelled statement itself.
2332 *
2333 * @param pos The position to be used for error diagnostics
2334 * @param tag The tag of the jump statement. This is either
2335 * Tree.BREAK or Tree.CONTINUE.
2336 * @param label The label of the jump statement, or null if no
2337 * label is given.
2338 * @param env The environment current at the jump statement.
2339 */
2340 private JCTree findJumpTarget(DiagnosticPosition pos,
2341 JCTree.Tag tag,
2342 Name label,
2343 Env<AttrContext> env) {
2344 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2345
2346 if (jumpTarget.snd != null) {
2347 log.error(pos, jumpTarget.snd);
2348 }
2349
2350 return jumpTarget.fst;
2351 }
2352 /** Return the target of a break or continue statement, if it exists,
2353 * report an error if not.
2354 * Note: The target of a labelled break or continue is the
2355 * (non-labelled) statement tree referred to by the label,
2356 * not the tree representing the labelled statement itself.
2357 *
2358 * @param tag The tag of the jump statement. This is either
2359 * Tree.BREAK or Tree.CONTINUE.
2360 * @param label The label of the jump statement, or null if no
2361 * label is given.
2362 * @param env The environment current at the jump statement.
2363 */
2364 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2365 Name label,
2366 Env<AttrContext> env) {
2367 // Search environments outwards from the point of jump.
2368 Env<AttrContext> env1 = env;
2369 JCDiagnostic.Error pendingError = null;
2370 LOOP:
2371 while (env1 != null) {
2372 switch (env1.tree.getTag()) {
2373 case LABELLED:
2374 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2375 if (label == labelled.label) {
2376 // If jump is a continue, check that target is a loop.
2377 if (tag == CONTINUE) {
2378 if (!labelled.body.hasTag(DOLOOP) &&
2379 !labelled.body.hasTag(WHILELOOP) &&
2380 !labelled.body.hasTag(FORLOOP) &&
2381 !labelled.body.hasTag(FOREACHLOOP)) {
2382 pendingError = Errors.NotLoopLabel(label);
2383 }
2384 // Found labelled statement target, now go inwards
2385 // to next non-labelled tree.
2386 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2387 } else {
2388 return Pair.of(labelled, pendingError);
2389 }
2390 }
2391 break;
2392 case DOLOOP:
2393 case WHILELOOP:
2394 case FORLOOP:
2395 case FOREACHLOOP:
2396 if (label == null) return Pair.of(env1.tree, pendingError);
2397 break;
2398 case SWITCH:
2399 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2400 break;
2401 case SWITCH_EXPRESSION:
2402 if (tag == YIELD) {
2403 return Pair.of(env1.tree, null);
2404 } else if (tag == BREAK) {
2405 pendingError = Errors.BreakOutsideSwitchExpression;
2406 } else {
2407 pendingError = Errors.ContinueOutsideSwitchExpression;
2408 }
2409 break;
2410 case LAMBDA:
2411 case METHODDEF:
2412 case CLASSDEF:
2413 break LOOP;
2414 default:
2415 }
2416 env1 = env1.next;
2417 }
2418 if (label != null)
2419 return Pair.of(null, Errors.UndefLabel(label));
2420 else if (pendingError != null)
2421 return Pair.of(null, pendingError);
2422 else if (tag == CONTINUE)
2423 return Pair.of(null, Errors.ContOutsideLoop);
2424 else
2425 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2426 }
2427
2428 public void visitReturn(JCReturn tree) {
2429 // Check that there is an enclosing method which is
2430 // nested within than the enclosing class.
2431 if (env.info.returnResult == null) {
2432 log.error(tree.pos(), Errors.RetOutsideMeth);
2433 } else if (env.info.yieldResult != null) {
2434 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2435 } else if (!env.info.isLambda &&
2436 !env.info.isNewClass &&
2437 env.enclMethod != null &&
2438 TreeInfo.isCompactConstructor(env.enclMethod)) {
2439 log.error(env.enclMethod,
2440 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2441 } else {
2442 // Attribute return expression, if it exists, and check that
2443 // it conforms to result type of enclosing method.
2444 if (tree.expr != null) {
2445 if (env.info.returnResult.pt.hasTag(VOID)) {
2446 env.info.returnResult.checkContext.report(tree.expr.pos(),
2447 diags.fragment(Fragments.UnexpectedRetVal));
2448 }
2449 attribTree(tree.expr, env, env.info.returnResult);
2450 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2451 !env.info.returnResult.pt.hasTag(NONE)) {
2452 env.info.returnResult.checkContext.report(tree.pos(),
2453 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2454 }
2455 }
2456 result = null;
2457 }
2458
2459 public void visitThrow(JCThrow tree) {
2460 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
2461 if (allowPoly) {
2462 chk.checkType(tree, owntype, syms.throwableType);
2463 }
2464 result = null;
2465 }
2466
2467 public void visitAssert(JCAssert tree) {
2468 attribExpr(tree.cond, env, syms.booleanType);
2469 if (tree.detail != null) {
2470 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2471 }
2472 result = null;
2473 }
2474
2475 /** Visitor method for method invocations.
2476 * NOTE: The method part of an application will have in its type field
2477 * the return type of the method, not the method's type itself!
2478 */
2479 public void visitApply(JCMethodInvocation tree) {
2480 // The local environment of a method application is
2481 // a new environment nested in the current one.
2482 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2483
2484 // The types of the actual method arguments.
2485 List<Type> argtypes;
2486
2487 // The types of the actual method type arguments.
2488 List<Type> typeargtypes = null;
2489
2490 Name methName = TreeInfo.name(tree.meth);
2491
2492 boolean isConstructorCall =
2493 methName == names._this || methName == names._super;
2494
2495 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2496 if (isConstructorCall) {
2497 // We are seeing a ...this(...) or ...super(...) call.
2498 // Check that this is the first statement in a constructor.
2499 checkFirstConstructorStat(tree, env.enclMethod, true);
2500
2501 // Record the fact
2502 // that this is a constructor call (using isSelfCall).
2503 localEnv.info.isSelfCall = true;
2504
2505 // Attribute arguments, yielding list of argument types.
2506 localEnv.info.constructorArgs = true;
2507 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2508 localEnv.info.constructorArgs = false;
2509 argtypes = argtypesBuf.toList();
2510 typeargtypes = attribTypes(tree.typeargs, localEnv);
2511
2512 // Variable `site' points to the class in which the called
2513 // constructor is defined.
2514 Type site = env.enclClass.sym.type;
2515 if (methName == names._super) {
2516 if (site == syms.objectType) {
2517 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2518 site = types.createErrorType(syms.objectType);
2519 } else {
2520 site = types.supertype(site);
2521 }
2522 }
2523
2524 if (site.hasTag(CLASS)) {
2525 Type encl = site.getEnclosingType();
2526 while (encl != null && encl.hasTag(TYPEVAR))
2527 encl = encl.getUpperBound();
2528 if (encl.hasTag(CLASS)) {
2529 // we are calling a nested class
2530
2531 if (tree.meth.hasTag(SELECT)) {
2532 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2533
2534 // We are seeing a prefixed call, of the form
2535 // <expr>.super(...).
2536 // Check that the prefix expression conforms
2537 // to the outer instance type of the class.
2538 chk.checkRefType(qualifier.pos(),
2539 attribExpr(qualifier, localEnv,
2540 encl));
2541 } else if (methName == names._super) {
2542 // qualifier omitted; check for existence
2543 // of an appropriate implicit qualifier.
2544 rs.resolveImplicitThis(tree.meth.pos(),
2545 localEnv, site, true);
2546 }
2547 } else if (tree.meth.hasTag(SELECT)) {
2548 log.error(tree.meth.pos(),
2549 Errors.IllegalQualNotIcls(site.tsym));
2550 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2551 }
2552
2553 // if we're calling a java.lang.Enum constructor,
2554 // prefix the implicit String and int parameters
2555 if (site.tsym == syms.enumSym)
2556 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2557
2558 // Resolve the called constructor under the assumption
2559 // that we are referring to a superclass instance of the
2560 // current instance (JLS ???).
2561 boolean selectSuperPrev = localEnv.info.selectSuper;
2562 localEnv.info.selectSuper = true;
2563 localEnv.info.pendingResolutionPhase = null;
2564 Symbol sym = rs.resolveConstructor(
2565 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2566 localEnv.info.selectSuper = selectSuperPrev;
2567
2568 // Set method symbol to resolved constructor...
2569 TreeInfo.setSymbol(tree.meth, sym);
2570
2571 // ...and check that it is legal in the current context.
2572 // (this will also set the tree's type)
2573 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2574 checkId(tree.meth, site, sym, localEnv,
2575 new ResultInfo(kind, mpt));
2576 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2577 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2578 }
2579 // Otherwise, `site' is an error type and we do nothing
2580 result = tree.type = syms.voidType;
2581 } else {
2582 // Otherwise, we are seeing a regular method call.
2583 // Attribute the arguments, yielding list of argument types, ...
2584 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2585 argtypes = argtypesBuf.toList();
2586 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2587
2588 // ... and attribute the method using as a prototype a methodtype
2589 // whose formal argument types is exactly the list of actual
2590 // arguments (this will also set the method symbol).
2591 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2592 localEnv.info.pendingResolutionPhase = null;
2593 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2594
2595 // Compute the result type.
2596 Type restype = mtype.getReturnType();
2597 if (restype.hasTag(WILDCARD))
2598 throw new AssertionError(mtype);
2599
2600 Type qualifier = (tree.meth.hasTag(SELECT))
2601 ? ((JCFieldAccess) tree.meth).selected.type
2602 : env.enclClass.sym.type;
2603 Symbol msym = TreeInfo.symbol(tree.meth);
2604 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2605
2606 chk.checkRefTypes(tree.typeargs, typeargtypes);
2607
2608 final Symbol symbol = TreeInfo.symbol(tree.meth);
2609 if (symbol != null) {
2610 /* Is this an ill-conceived attempt to invoke jlO methods not available on value class types ??
2611 */
2612 boolean superCallOnValueReceiver = env.enclClass.sym.type.isValueClass()
2613 && (tree.meth.hasTag(SELECT))
2614 && ((JCFieldAccess)tree.meth).selected.hasTag(IDENT)
2615 && TreeInfo.name(((JCFieldAccess)tree.meth).selected) == names._super;
2616 if (qualifier.isValueClass() || superCallOnValueReceiver) {
2617 int argSize = argtypes.size();
2618 Name name = symbol.name;
2619 switch (name.toString()) {
2620 case "wait":
2621 if (argSize == 0
2622 || (types.isConvertible(argtypes.head, syms.longType) &&
2623 (argSize == 1 || (argSize == 2 && types.isConvertible(argtypes.tail.head, syms.intType))))) {
2624 log.error(tree.pos(), Errors.ValueClassDoesNotSupport(name));
2625 }
2626 break;
2627 case "notify":
2628 case "notifyAll":
2629 case "finalize":
2630 if (argSize == 0)
2631 log.error(tree.pos(), Errors.ValueClassDoesNotSupport(name));
2632 break;
2633 }
2634 }
2635 }
2636
2637 // Check that value of resulting type is admissible in the
2638 // current context. Also, capture the return type
2639 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2640 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2641 }
2642 chk.validate(tree.typeargs, localEnv);
2643 }
2644 //where
2645 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2646 if (msym != null &&
2647 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2648 methodName == names.getClass &&
2649 argtypes.isEmpty()) {
2650 // as a special case, x.getClass() has type Class<? extends |X|>
2651 // Special treatment for primitive classes: Given an expression v of type V where
2652 // V is a primitive class, v.getClass() is typed to be Class<? extends |V.ref|>
2653 Type wcb = types.erasure(qualifierType.isPrimitiveClass() ?
2654 qualifierType.referenceProjection() : qualifierType);
2655 return new ClassType(restype.getEnclosingType(),
2656 List.of(new WildcardType(wcb,
2657 BoundKind.EXTENDS,
2658 syms.boundClass)),
2659 restype.tsym,
2660 restype.getMetadata(),
2661 restype.getFlavor());
2662 } else if (msym != null &&
2663 msym.owner == syms.arrayClass &&
2664 methodName == names.clone &&
2665 types.isArray(qualifierType)) {
2666 // as a special case, array.clone() has a result that is
2667 // the same as static type of the array being cloned
2668 return qualifierType;
2669 } else {
2670 return restype;
2671 }
2672 }
2673
2674 /** Check that given application node appears as first statement
2675 * in a constructor call.
2676 * @param tree The application node
2677 * @param enclMethod The enclosing method of the application.
2678 * @param error Should an error be issued?
2679 */
2680 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2681 if (enclMethod != null && enclMethod.name == names.init) {
2682 JCBlock body = enclMethod.body;
2683 if (body.stats.head.hasTag(EXEC) &&
2684 ((JCExpressionStatement) body.stats.head).expr == tree)
2685 return true;
2686 }
2687 if (error) {
2688 log.error(tree.pos(),
2689 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2690 }
2691 return false;
2692 }
2693
2694 /** Obtain a method type with given argument types.
2695 */
2696 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2697 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2698 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2699 }
2700
2701 public void visitNewClass(final JCNewClass tree) {
2702 Type owntype = types.createErrorType(tree.type);
2703
2704 // The local environment of a class creation is
2705 // a new environment nested in the current one.
2706 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2707
2708 // The anonymous inner class definition of the new expression,
2709 // if one is defined by it.
2710 JCClassDecl cdef = tree.def;
2711
2712 // If enclosing class is given, attribute it, and
2713 // complete class name to be fully qualified
2714 JCExpression clazz = tree.clazz; // Class field following new
2715 JCExpression clazzid; // Identifier in class field
2716 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2717 annoclazzid = null;
2718
2719 if (clazz.hasTag(TYPEAPPLY)) {
2720 clazzid = ((JCTypeApply) clazz).clazz;
2721 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2722 annoclazzid = (JCAnnotatedType) clazzid;
2723 clazzid = annoclazzid.underlyingType;
2724 }
2725 } else {
2726 if (clazz.hasTag(ANNOTATED_TYPE)) {
2727 annoclazzid = (JCAnnotatedType) clazz;
2728 clazzid = annoclazzid.underlyingType;
2729 } else {
2730 clazzid = clazz;
2731 }
2732 }
2733
2734 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2735
2736 if (tree.encl != null) {
2737 // We are seeing a qualified new, of the form
2738 // <expr>.new C <...> (...) ...
2739 // In this case, we let clazz stand for the name of the
2740 // allocated class C prefixed with the type of the qualifier
2741 // expression, so that we can
2742 // resolve it with standard techniques later. I.e., if
2743 // <expr> has type T, then <expr>.new C <...> (...)
2744 // yields a clazz T.C.
2745 Type encltype = chk.checkRefType(tree.encl.pos(),
2746 attribExpr(tree.encl, env));
2747 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2748 // from expr to the combined type, or not? Yes, do this.
2749 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2750 ((JCIdent) clazzid).name);
2751
2752 EndPosTable endPosTable = this.env.toplevel.endPositions;
2753 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2754 if (clazz.hasTag(ANNOTATED_TYPE)) {
2755 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2756 List<JCAnnotation> annos = annoType.annotations;
2757
2758 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2759 clazzid1 = make.at(tree.pos).
2760 TypeApply(clazzid1,
2761 ((JCTypeApply) clazz).arguments);
2762 }
2763
2764 clazzid1 = make.at(tree.pos).
2765 AnnotatedType(annos, clazzid1);
2766 } else if (clazz.hasTag(TYPEAPPLY)) {
2767 clazzid1 = make.at(tree.pos).
2768 TypeApply(clazzid1,
2769 ((JCTypeApply) clazz).arguments);
2770 }
2771
2772 clazz = clazzid1;
2773 }
2774
2775 // Attribute clazz expression and store
2776 // symbol + type back into the attributed tree.
2777 Type clazztype;
2778
2779 try {
2780 env.info.isNewClass = true;
2781 clazztype = TreeInfo.isEnumInit(env.tree) ?
2782 attribIdentAsEnumType(env, (JCIdent)clazz) :
2783 attribType(clazz, env);
2784 } finally {
2785 env.info.isNewClass = false;
2786 }
2787
2788 clazztype = chk.checkDiamond(tree, clazztype);
2789 chk.validate(clazz, localEnv);
2790 if (tree.encl != null) {
2791 // We have to work in this case to store
2792 // symbol + type back into the attributed tree.
2793 tree.clazz.type = clazztype;
2794 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2795 clazzid.type = ((JCIdent) clazzid).sym.type;
2796 if (annoclazzid != null) {
2797 annoclazzid.type = clazzid.type;
2798 }
2799 if (!clazztype.isErroneous()) {
2800 if (cdef != null && clazztype.tsym.isInterface()) {
2801 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2802 } else if (clazztype.tsym.isStatic()) {
2803 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2804 }
2805 }
2806 } else if (!clazztype.tsym.isInterface() &&
2807 clazztype.getEnclosingType().hasTag(CLASS)) {
2808 // Check for the existence of an apropos outer instance
2809 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2810 }
2811
2812 // Attribute constructor arguments.
2813 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2814 final KindSelector pkind =
2815 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2816 List<Type> argtypes = argtypesBuf.toList();
2817 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2818
2819 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2820 // Enums may not be instantiated except implicitly
2821 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2822 (!env.tree.hasTag(VARDEF) ||
2823 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2824 ((JCVariableDecl) env.tree).init != tree))
2825 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2826
2827 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2828 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2829 boolean skipNonDiamondPath = false;
2830 // Check that it is an instantiation of a class and not a projection type
2831 if (clazz.hasTag(SELECT)) {
2832 JCFieldAccess fieldAccess = (JCFieldAccess) clazz;
2833 if (fieldAccess.selected.type.isPrimitiveClass() &&
2834 (fieldAccess.name == names.ref || fieldAccess.name == names.val)) {
2835 log.error(tree.pos(), Errors.ProjectionCantBeInstantiated);
2836 }
2837 }
2838 // Check that class is not abstract
2839 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2840 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2841 log.error(tree.pos(),
2842 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2843 skipNonDiamondPath = true;
2844 } else if (cdef != null && clazztype.tsym.isInterface()) {
2845 // Check that no constructor arguments are given to
2846 // anonymous classes implementing an interface
2847 if (!argtypes.isEmpty())
2848 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2849
2850 if (!typeargtypes.isEmpty())
2851 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2852
2853 // Error recovery: pretend no arguments were supplied.
2854 argtypes = List.nil();
2855 typeargtypes = List.nil();
2856 skipNonDiamondPath = true;
2857 }
2858 if (TreeInfo.isDiamond(tree)) {
2859 ClassType site = new ClassType(clazztype.getEnclosingType(),
2860 clazztype.tsym.type.getTypeArguments(),
2861 clazztype.tsym,
2862 clazztype.getMetadata(),
2863 clazztype.getFlavor());
2864
2865 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2866 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2867 diamondEnv.info.pendingResolutionPhase = null;
2868
2869 //if the type of the instance creation expression is a class type
2870 //apply method resolution inference (JLS 15.12.2.7). The return type
2871 //of the resolved constructor will be a partially instantiated type
2872 Symbol constructor = rs.resolveDiamond(tree.pos(),
2873 diamondEnv,
2874 site,
2875 argtypes,
2876 typeargtypes);
2877 tree.constructor = constructor.baseSymbol();
2878
2879 final TypeSymbol csym = clazztype.tsym;
2880 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2881 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2882 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2883 constructorType = checkId(tree, site,
2884 constructor,
2885 diamondEnv,
2886 diamondResult);
2887
2888 tree.clazz.type = types.createErrorType(clazztype);
2889 if (!constructorType.isErroneous()) {
2890 tree.clazz.type = clazz.type = constructorType.getReturnType();
2891 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2892 }
2893 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2894 }
2895
2896 // Resolve the called constructor under the assumption
2897 // that we are referring to a superclass instance of the
2898 // current instance (JLS ???).
2899 else if (!skipNonDiamondPath) {
2900 //the following code alters some of the fields in the current
2901 //AttrContext - hence, the current context must be dup'ed in
2902 //order to avoid downstream failures
2903 Env<AttrContext> rsEnv = localEnv.dup(tree);
2904 rsEnv.info.selectSuper = cdef != null;
2905 rsEnv.info.pendingResolutionPhase = null;
2906 tree.constructor = rs.resolveConstructor(
2907 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2908 if (cdef == null) { //do not check twice!
2909 tree.constructorType = checkId(tree,
2910 clazztype,
2911 tree.constructor,
2912 rsEnv,
2913 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2914 if (rsEnv.info.lastResolveVarargs())
2915 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2916 }
2917 }
2918
2919 if (cdef != null) {
2920 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2921 return;
2922 }
2923
2924 if (tree.constructor != null && tree.constructor.kind == MTH)
2925 owntype = clazztype;
2926 }
2927 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2928 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2929 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2930 //we need to wait for inference to finish and then replace inference vars in the constructor type
2931 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2932 instantiatedContext -> {
2933 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2934 });
2935 }
2936 chk.validate(tree.typeargs, localEnv);
2937 }
2938
2939 // where
2940 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2941 JCClassDecl cdef, Env<AttrContext> localEnv,
2942 List<Type> argtypes, List<Type> typeargtypes,
2943 KindSelector pkind) {
2944 // We are seeing an anonymous class instance creation.
2945 // In this case, the class instance creation
2946 // expression
2947 //
2948 // E.new <typeargs1>C<typargs2>(args) { ... }
2949 //
2950 // is represented internally as
2951 //
2952 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2953 //
2954 // This expression is then *transformed* as follows:
2955 //
2956 // (1) add an extends or implements clause
2957 // (2) add a constructor.
2958 //
2959 // For instance, if C is a class, and ET is the type of E,
2960 // the expression
2961 //
2962 // E.new <typeargs1>C<typargs2>(args) { ... }
2963 //
2964 // is translated to (where X is a fresh name and typarams is the
2965 // parameter list of the super constructor):
2966 //
2967 // new <typeargs1>X(<*nullchk*>E, args) where
2968 // X extends C<typargs2> {
2969 // <typarams> X(ET e, args) {
2970 // e.<typeargs1>super(args)
2971 // }
2972 // ...
2973 // }
2974 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2975 Type enclType = clazztype.getEnclosingType();
2976 if (enclType != null &&
2977 enclType.hasTag(CLASS) &&
2978 !chk.checkDenotable((ClassType)enclType)) {
2979 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2980 }
2981 final boolean isDiamond = TreeInfo.isDiamond(tree);
2982 if (isDiamond
2983 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2984 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2985 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2986 Env<AttrContext> dupLocalEnv = localEnv.dup(localEnv.tree, localEnv.info.dup(localEnv.info.scope.dupUnshared()));
2987 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2988 instantiatedContext -> {
2989 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2990 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2991 ResultInfo prevResult = this.resultInfo;
2992 try {
2993 this.resultInfo = resultInfoForClassDefinition;
2994 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2995 dupLocalEnv, argtypes, typeargtypes, pkind);
2996 } finally {
2997 this.resultInfo = prevResult;
2998 }
2999 });
3000 } else {
3001 if (isDiamond && clazztype.hasTag(CLASS)) {
3002 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3003 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3004 // One or more types inferred in the previous steps is non-denotable.
3005 Fragment fragment = Diamond(clazztype.tsym);
3006 log.error(tree.clazz.pos(),
3007 Errors.CantApplyDiamond1(
3008 fragment,
3009 invalidDiamondArgs.size() > 1 ?
3010 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3011 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3012 }
3013 // For <>(){}, inferred types must also be accessible.
3014 for (Type t : clazztype.getTypeArguments()) {
3015 rs.checkAccessibleType(env, t);
3016 }
3017 chk.checkParameterizationByPrimitiveClass(tree, clazztype);
3018 }
3019
3020 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3021 // false for isInterface call even when the original type is an interface.
3022 boolean implementing = clazztype.tsym.isInterface() ||
3023 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3024 clazztype.getOriginalType().tsym.isInterface();
3025
3026 if (implementing) {
3027 cdef.implementing = List.of(clazz);
3028 } else {
3029 cdef.extending = clazz;
3030 }
3031
3032 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3033 rs.isSerializable(clazztype)) {
3034 localEnv.info.isSerializable = true;
3035 }
3036
3037 attribStat(cdef, localEnv);
3038
3039 List<Type> finalargtypes;
3040 // If an outer instance is given,
3041 // prefix it to the constructor arguments
3042 // and delete it from the new expression
3043 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3044 finalargtypes = argtypes.prepend(tree.encl.type);
3045 } else {
3046 finalargtypes = argtypes;
3047 }
3048
3049 // Reassign clazztype and recompute constructor. As this necessarily involves
3050 // another attribution pass for deferred types in the case of <>, replicate
3051 // them. Original arguments have right decorations already.
3052 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3053 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3054 }
3055
3056 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3057 : cdef.sym.type;
3058 Symbol sym = tree.constructor = rs.resolveConstructor(
3059 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3060 Assert.check(!sym.kind.isResolutionError());
3061 tree.constructor = sym;
3062 tree.constructorType = checkId(tree,
3063 clazztype,
3064 tree.constructor,
3065 localEnv,
3066 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3067 }
3068 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3069 clazztype : types.createErrorType(tree.type);
3070 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3071 chk.validate(tree.typeargs, localEnv);
3072 }
3073
3074 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3075 return new Check.NestedCheckContext(checkContext) {
3076 @Override
3077 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3078 enclosingContext.report(clazz.clazz,
3079 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3080 }
3081 };
3082 }
3083
3084 /** Make an attributed null check tree.
3085 */
3086 public JCExpression makeNullCheck(JCExpression arg) {
3087 // optimization: new Outer() can never be null; skip null check
3088 if (arg.getTag() == NEWCLASS)
3089 return arg;
3090 // Likewise arg can't be null if it is a primitive class instance.
3091 if (arg.type.isPrimitiveClass())
3092 return arg;
3093 // optimization: X.this is never null; skip null check
3094 Name name = TreeInfo.name(arg);
3095 if (name == names._this || name == names._super) return arg;
3096
3097 JCTree.Tag optag = NULLCHK;
3098 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3099 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3100 tree.type = arg.type;
3101 return tree;
3102 }
3103
3104 public void visitNewArray(JCNewArray tree) {
3105 Type owntype = types.createErrorType(tree.type);
3106 Env<AttrContext> localEnv = env.dup(tree);
3107 Type elemtype;
3108 if (tree.elemtype != null) {
3109 elemtype = attribType(tree.elemtype, localEnv);
3110 chk.validate(tree.elemtype, localEnv);
3111 owntype = elemtype;
3112 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3113 attribExpr(l.head, localEnv, syms.intType);
3114 owntype = new ArrayType(owntype, syms.arrayClass);
3115 }
3116 } else {
3117 // we are seeing an untyped aggregate { ... }
3118 // this is allowed only if the prototype is an array
3119 if (pt().hasTag(ARRAY)) {
3120 elemtype = types.elemtype(pt());
3121 } else {
3122 if (!pt().hasTag(ERROR) &&
3123 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3124 log.error(tree.pos(),
3125 Errors.IllegalInitializerForType(pt()));
3126 }
3127 elemtype = types.createErrorType(pt());
3128 }
3129 }
3130 if (tree.elems != null) {
3131 attribExprs(tree.elems, localEnv, elemtype);
3132 owntype = new ArrayType(elemtype, syms.arrayClass);
3133 }
3134 if (!types.isReifiable(elemtype))
3135 log.error(tree.pos(), Errors.GenericArrayCreation);
3136 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3137 }
3138
3139 /*
3140 * A lambda expression can only be attributed when a target-type is available.
3141 * In addition, if the target-type is that of a functional interface whose
3142 * descriptor contains inference variables in argument position the lambda expression
3143 * is 'stuck' (see DeferredAttr).
3144 */
3145 @Override
3146 public void visitLambda(final JCLambda that) {
3147 boolean wrongContext = false;
3148 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3149 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3150 //lambda only allowed in assignment or method invocation/cast context
3151 log.error(that.pos(), Errors.UnexpectedLambda);
3152 }
3153 resultInfo = recoveryInfo;
3154 wrongContext = true;
3155 }
3156 //create an environment for attribution of the lambda expression
3157 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3158 boolean needsRecovery =
3159 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3160 try {
3161 if (needsRecovery && rs.isSerializable(pt())) {
3162 localEnv.info.isSerializable = true;
3163 localEnv.info.isSerializableLambda = true;
3164 }
3165 List<Type> explicitParamTypes = null;
3166 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3167 //attribute lambda parameters
3168 attribStats(that.params, localEnv);
3169 explicitParamTypes = TreeInfo.types(that.params);
3170 }
3171
3172 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3173 Type currentTarget = targetInfo.target;
3174 Type lambdaType = targetInfo.descriptor;
3175
3176 if (currentTarget.isErroneous()) {
3177 result = that.type = currentTarget;
3178 return;
3179 }
3180
3181 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3182
3183 if (lambdaType.hasTag(FORALL)) {
3184 //lambda expression target desc cannot be a generic method
3185 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3186 kindName(currentTarget.tsym),
3187 currentTarget.tsym);
3188 resultInfo.checkContext.report(that, diags.fragment(msg));
3189 result = that.type = types.createErrorType(pt());
3190 return;
3191 }
3192
3193 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3194 //add param type info in the AST
3195 List<Type> actuals = lambdaType.getParameterTypes();
3196 List<JCVariableDecl> params = that.params;
3197
3198 boolean arityMismatch = false;
3199
3200 while (params.nonEmpty()) {
3201 if (actuals.isEmpty()) {
3202 //not enough actuals to perform lambda parameter inference
3203 arityMismatch = true;
3204 }
3205 //reset previously set info
3206 Type argType = arityMismatch ?
3207 syms.errType :
3208 actuals.head;
3209 if (params.head.isImplicitlyTyped()) {
3210 setSyntheticVariableType(params.head, argType);
3211 }
3212 params.head.sym = null;
3213 actuals = actuals.isEmpty() ?
3214 actuals :
3215 actuals.tail;
3216 params = params.tail;
3217 }
3218
3219 //attribute lambda parameters
3220 attribStats(that.params, localEnv);
3221
3222 if (arityMismatch) {
3223 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3224 result = that.type = types.createErrorType(currentTarget);
3225 return;
3226 }
3227 }
3228
3229 //from this point on, no recovery is needed; if we are in assignment context
3230 //we will be able to attribute the whole lambda body, regardless of errors;
3231 //if we are in a 'check' method context, and the lambda is not compatible
3232 //with the target-type, it will be recovered anyway in Attr.checkId
3233 needsRecovery = false;
3234
3235 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3236 lambdaBodyResult(that, lambdaType, resultInfo);
3237
3238 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3239 attribTree(that.getBody(), localEnv, bodyResultInfo);
3240 } else {
3241 JCBlock body = (JCBlock)that.body;
3242 if (body == breakTree &&
3243 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3244 breakTreeFound(copyEnv(localEnv));
3245 }
3246 attribStats(body.stats, localEnv);
3247 }
3248
3249 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3250
3251 boolean isSpeculativeRound =
3252 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3253
3254 preFlow(that);
3255 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3256
3257 that.type = currentTarget; //avoids recovery at this stage
3258 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3259
3260 if (!isSpeculativeRound) {
3261 //add thrown types as bounds to the thrown types free variables if needed:
3262 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3263 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3264 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3265 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3266 }
3267 }
3268
3269 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3270 }
3271 result = wrongContext ? that.type = types.createErrorType(pt())
3272 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3273 } catch (Types.FunctionDescriptorLookupError ex) {
3274 JCDiagnostic cause = ex.getDiagnostic();
3275 resultInfo.checkContext.report(that, cause);
3276 result = that.type = types.createErrorType(pt());
3277 return;
3278 } catch (CompletionFailure cf) {
3279 chk.completionError(that.pos(), cf);
3280 } catch (Throwable t) {
3281 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3282 //as that would likely cause the same exception again.
3283 needsRecovery = false;
3284 throw t;
3285 } finally {
3286 localEnv.info.scope.leave();
3287 if (needsRecovery) {
3288 Type prevResult = result;
3289 try {
3290 attribTree(that, env, recoveryInfo);
3291 } finally {
3292 if (result == Type.recoveryType) {
3293 result = prevResult;
3294 }
3295 }
3296 }
3297 }
3298 }
3299 //where
3300 class TargetInfo {
3301 Type target;
3302 Type descriptor;
3303
3304 public TargetInfo(Type target, Type descriptor) {
3305 this.target = target;
3306 this.descriptor = descriptor;
3307 }
3308 }
3309
3310 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3311 Type lambdaType;
3312 Type currentTarget = resultInfo.pt;
3313 if (resultInfo.pt != Type.recoveryType) {
3314 /* We need to adjust the target. If the target is an
3315 * intersection type, for example: SAM & I1 & I2 ...
3316 * the target will be updated to SAM
3317 */
3318 currentTarget = targetChecker.visit(currentTarget, that);
3319 if (!currentTarget.isIntersection()) {
3320 if (explicitParamTypes != null) {
3321 currentTarget = infer.instantiateFunctionalInterface(that,
3322 currentTarget, explicitParamTypes, resultInfo.checkContext);
3323 }
3324 currentTarget = types.removeWildcards(currentTarget);
3325 lambdaType = types.findDescriptorType(currentTarget);
3326 } else {
3327 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3328 ListBuffer<Type> components = new ListBuffer<>();
3329 for (Type bound : ict.getExplicitComponents()) {
3330 if (explicitParamTypes != null) {
3331 try {
3332 bound = infer.instantiateFunctionalInterface(that,
3333 bound, explicitParamTypes, resultInfo.checkContext);
3334 } catch (FunctionDescriptorLookupError t) {
3335 // do nothing
3336 }
3337 }
3338 bound = types.removeWildcards(bound);
3339 components.add(bound);
3340 }
3341 currentTarget = types.makeIntersectionType(components.toList());
3342 currentTarget.tsym.flags_field |= INTERFACE;
3343 lambdaType = types.findDescriptorType(currentTarget);
3344 }
3345
3346 } else {
3347 currentTarget = Type.recoveryType;
3348 lambdaType = fallbackDescriptorType(that);
3349 }
3350 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3351 //lambda expression target desc cannot be a generic method
3352 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3353 kindName(currentTarget.tsym),
3354 currentTarget.tsym);
3355 resultInfo.checkContext.report(that, diags.fragment(msg));
3356 currentTarget = types.createErrorType(pt());
3357 }
3358 return new TargetInfo(currentTarget, lambdaType);
3359 }
3360
3361 void preFlow(JCLambda tree) {
3362 attrRecover.doRecovery();
3363 new PostAttrAnalyzer() {
3364 @Override
3365 public void scan(JCTree tree) {
3366 if (tree == null ||
3367 (tree.type != null &&
3368 tree.type == Type.stuckType)) {
3369 //don't touch stuck expressions!
3370 return;
3371 }
3372 super.scan(tree);
3373 }
3374
3375 @Override
3376 public void visitClassDef(JCClassDecl that) {
3377 // or class declaration trees!
3378 }
3379
3380 public void visitLambda(JCLambda that) {
3381 // or lambda expressions!
3382 }
3383 }.scan(tree.body);
3384 }
3385
3386 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3387
3388 @Override
3389 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3390 return t.isIntersection() ?
3391 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3392 }
3393
3394 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3395 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3396 return ict;
3397 }
3398
3399 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3400 ListBuffer<Type> targs = new ListBuffer<>();
3401 ListBuffer<Type> supertypes = new ListBuffer<>();
3402 for (Type i : ict.interfaces_field) {
3403 if (i.isParameterized()) {
3404 targs.appendList(i.tsym.type.allparams());
3405 }
3406 supertypes.append(i.tsym.type);
3407 }
3408 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3409 notionalIntf.allparams_field = targs.toList();
3410 notionalIntf.tsym.flags_field |= INTERFACE;
3411 return notionalIntf.tsym;
3412 }
3413 };
3414
3415 private Type fallbackDescriptorType(JCExpression tree) {
3416 switch (tree.getTag()) {
3417 case LAMBDA:
3418 JCLambda lambda = (JCLambda)tree;
3419 List<Type> argtypes = List.nil();
3420 for (JCVariableDecl param : lambda.params) {
3421 argtypes = param.vartype != null && param.vartype.type != null ?
3422 argtypes.append(param.vartype.type) :
3423 argtypes.append(syms.errType);
3424 }
3425 return new MethodType(argtypes, Type.recoveryType,
3426 List.of(syms.throwableType), syms.methodClass);
3427 case REFERENCE:
3428 return new MethodType(List.nil(), Type.recoveryType,
3429 List.of(syms.throwableType), syms.methodClass);
3430 default:
3431 Assert.error("Cannot get here!");
3432 }
3433 return null;
3434 }
3435
3436 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3437 final InferenceContext inferenceContext, final Type... ts) {
3438 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3439 }
3440
3441 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3442 final InferenceContext inferenceContext, final List<Type> ts) {
3443 if (inferenceContext.free(ts)) {
3444 inferenceContext.addFreeTypeListener(ts,
3445 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3446 } else {
3447 for (Type t : ts) {
3448 rs.checkAccessibleType(env, t);
3449 }
3450 }
3451 }
3452
3453 /**
3454 * Lambda/method reference have a special check context that ensures
3455 * that i.e. a lambda return type is compatible with the expected
3456 * type according to both the inherited context and the assignment
3457 * context.
3458 */
3459 class FunctionalReturnContext extends Check.NestedCheckContext {
3460
3461 FunctionalReturnContext(CheckContext enclosingContext) {
3462 super(enclosingContext);
3463 }
3464
3465 @Override
3466 public boolean compatible(Type found, Type req, Warner warn) {
3467 //return type must be compatible in both current context and assignment context
3468 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3469 }
3470
3471 @Override
3472 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3473 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3474 }
3475 }
3476
3477 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3478
3479 JCExpression expr;
3480 boolean expStmtExpected;
3481
3482 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3483 super(enclosingContext);
3484 this.expr = expr;
3485 }
3486
3487 @Override
3488 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3489 if (expStmtExpected) {
3490 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3491 } else {
3492 super.report(pos, details);
3493 }
3494 }
3495
3496 @Override
3497 public boolean compatible(Type found, Type req, Warner warn) {
3498 //a void return is compatible with an expression statement lambda
3499 if (req.hasTag(VOID)) {
3500 expStmtExpected = true;
3501 return TreeInfo.isExpressionStatement(expr);
3502 } else {
3503 return super.compatible(found, req, warn);
3504 }
3505 }
3506 }
3507
3508 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3509 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3510 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3511 new FunctionalReturnContext(resultInfo.checkContext);
3512
3513 return descriptor.getReturnType() == Type.recoveryType ?
3514 recoveryInfo :
3515 new ResultInfo(KindSelector.VAL,
3516 descriptor.getReturnType(), funcContext);
3517 }
3518
3519 /**
3520 * Lambda compatibility. Check that given return types, thrown types, parameter types
3521 * are compatible with the expected functional interface descriptor. This means that:
3522 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3523 * types must be compatible with the return type of the expected descriptor.
3524 */
3525 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3526 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3527
3528 //return values have already been checked - but if lambda has no return
3529 //values, we must ensure that void/value compatibility is correct;
3530 //this amounts at checking that, if a lambda body can complete normally,
3531 //the descriptor's return type must be void
3532 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3533 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3534 Fragment msg =
3535 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3536 checkContext.report(tree,
3537 diags.fragment(msg));
3538 }
3539
3540 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3541 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3542 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3543 }
3544 }
3545
3546 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3547 * static field and that lambda has type annotations, these annotations will
3548 * also be stored at these fake clinit methods.
3549 *
3550 * LambdaToMethod also use fake clinit methods so they can be reused.
3551 * Also as LTM is a phase subsequent to attribution, the methods from
3552 * clinits can be safely removed by LTM to save memory.
3553 */
3554 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3555
3556 public MethodSymbol removeClinit(ClassSymbol sym) {
3557 return clinits.remove(sym);
3558 }
3559
3560 /* This method returns an environment to be used to attribute a lambda
3561 * expression.
3562 *
3563 * The owner of this environment is a method symbol. If the current owner
3564 * is not a method, for example if the lambda is used to initialize
3565 * a field, then if the field is:
3566 *
3567 * - an instance field, we use the first constructor.
3568 * - a static field, we create a fake clinit method.
3569 */
3570 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3571 Env<AttrContext> lambdaEnv;
3572 Symbol owner = env.info.scope.owner;
3573 if (owner.kind == VAR && owner.owner.kind == TYP) {
3574 //field initializer
3575 ClassSymbol enclClass = owner.enclClass();
3576 Symbol newScopeOwner = env.info.scope.owner;
3577 /* if the field isn't static, then we can get the first constructor
3578 * and use it as the owner of the environment. This is what
3579 * LTM code is doing to look for type annotations so we are fine.
3580 */
3581 if ((owner.flags() & STATIC) == 0) {
3582 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3583 newScopeOwner = s;
3584 break;
3585 }
3586 } else {
3587 /* if the field is static then we need to create a fake clinit
3588 * method, this method can later be reused by LTM.
3589 */
3590 MethodSymbol clinit = clinits.get(enclClass);
3591 if (clinit == null) {
3592 Type clinitType = new MethodType(List.nil(),
3593 syms.voidType, List.nil(), syms.methodClass);
3594 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3595 names.clinit, clinitType, enclClass);
3596 clinit.params = List.nil();
3597 clinits.put(enclClass, clinit);
3598 }
3599 newScopeOwner = clinit;
3600 }
3601 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3602 } else {
3603 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3604 }
3605 lambdaEnv.info.yieldResult = null;
3606 lambdaEnv.info.isLambda = true;
3607 return lambdaEnv;
3608 }
3609
3610 @Override
3611 public void visitReference(final JCMemberReference that) {
3612 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3613 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3614 //method reference only allowed in assignment or method invocation/cast context
3615 log.error(that.pos(), Errors.UnexpectedMref);
3616 }
3617 result = that.type = types.createErrorType(pt());
3618 return;
3619 }
3620 final Env<AttrContext> localEnv = env.dup(that);
3621 try {
3622 //attribute member reference qualifier - if this is a constructor
3623 //reference, the expected kind must be a type
3624 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3625
3626 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3627 exprType = chk.checkConstructorRefType(that.expr, exprType);
3628 if (!exprType.isErroneous() &&
3629 exprType.isRaw() &&
3630 that.typeargs != null) {
3631 log.error(that.expr.pos(),
3632 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3633 Fragments.MrefInferAndExplicitParams));
3634 exprType = types.createErrorType(exprType);
3635 }
3636 }
3637
3638 if (exprType.isErroneous()) {
3639 //if the qualifier expression contains problems,
3640 //give up attribution of method reference
3641 result = that.type = exprType;
3642 return;
3643 }
3644
3645 if (TreeInfo.isStaticSelector(that.expr, names)) {
3646 //if the qualifier is a type, validate it; raw warning check is
3647 //omitted as we don't know at this stage as to whether this is a
3648 //raw selector (because of inference)
3649 chk.validate(that.expr, env, false);
3650 } else {
3651 Symbol lhsSym = TreeInfo.symbol(that.expr);
3652 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3653 }
3654 //attrib type-arguments
3655 List<Type> typeargtypes = List.nil();
3656 if (that.typeargs != null) {
3657 typeargtypes = attribTypes(that.typeargs, localEnv);
3658 }
3659
3660 boolean isTargetSerializable =
3661 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3662 rs.isSerializable(pt());
3663 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3664 Type currentTarget = targetInfo.target;
3665 Type desc = targetInfo.descriptor;
3666
3667 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3668 List<Type> argtypes = desc.getParameterTypes();
3669 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3670
3671 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3672 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3673 }
3674
3675 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3676 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3677 try {
3678 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3679 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3680 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3681 } finally {
3682 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3683 }
3684
3685 Symbol refSym = refResult.fst;
3686 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3687
3688 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3689 * JDK-8075541
3690 */
3691 if (refSym.kind != MTH) {
3692 boolean targetError;
3693 switch (refSym.kind) {
3694 case ABSENT_MTH:
3695 case MISSING_ENCL:
3696 targetError = false;
3697 break;
3698 case WRONG_MTH:
3699 case WRONG_MTHS:
3700 case AMBIGUOUS:
3701 case HIDDEN:
3702 case STATICERR:
3703 targetError = true;
3704 break;
3705 default:
3706 Assert.error("unexpected result kind " + refSym.kind);
3707 targetError = false;
3708 }
3709
3710 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3711 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3712 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3713
3714 JCDiagnostic diag = diags.create(log.currentSource(), that,
3715 targetError ?
3716 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3717 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3718
3719 if (targetError && currentTarget == Type.recoveryType) {
3720 //a target error doesn't make sense during recovery stage
3721 //as we don't know what actual parameter types are
3722 result = that.type = currentTarget;
3723 return;
3724 } else {
3725 if (targetError) {
3726 resultInfo.checkContext.report(that, diag);
3727 } else {
3728 log.report(diag);
3729 }
3730 result = that.type = types.createErrorType(currentTarget);
3731 return;
3732 }
3733 }
3734
3735 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3736 that.kind = lookupHelper.referenceKind(that.sym);
3737 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3738
3739 if (desc.getReturnType() == Type.recoveryType) {
3740 // stop here
3741 result = that.type = currentTarget;
3742 return;
3743 }
3744
3745 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3746 Type enclosingType = exprType.getEnclosingType();
3747 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3748 // Check for the existence of an appropriate outer instance
3749 rs.resolveImplicitThis(that.pos(), env, exprType);
3750 }
3751 }
3752
3753 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3754
3755 if (that.getMode() == ReferenceMode.INVOKE &&
3756 TreeInfo.isStaticSelector(that.expr, names) &&
3757 that.kind.isUnbound() &&
3758 lookupHelper.site.isRaw()) {
3759 chk.checkRaw(that.expr, localEnv);
3760 }
3761
3762 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3763 exprType.getTypeArguments().nonEmpty()) {
3764 //static ref with class type-args
3765 log.error(that.expr.pos(),
3766 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3767 Fragments.StaticMrefWithTargs));
3768 result = that.type = types.createErrorType(currentTarget);
3769 return;
3770 }
3771
3772 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3773 // Check that super-qualified symbols are not abstract (JLS)
3774 rs.checkNonAbstract(that.pos(), that.sym);
3775 }
3776
3777 if (isTargetSerializable) {
3778 chk.checkAccessFromSerializableElement(that, true);
3779 }
3780 }
3781
3782 ResultInfo checkInfo =
3783 resultInfo.dup(newMethodTemplate(
3784 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3785 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3786 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3787
3788 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3789
3790 if (that.kind.isUnbound() &&
3791 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3792 //re-generate inference constraints for unbound receiver
3793 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3794 //cannot happen as this has already been checked - we just need
3795 //to regenerate the inference constraints, as that has been lost
3796 //as a result of the call to inferenceContext.save()
3797 Assert.error("Can't get here");
3798 }
3799 }
3800
3801 if (!refType.isErroneous()) {
3802 refType = types.createMethodTypeWithReturn(refType,
3803 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3804 }
3805
3806 //go ahead with standard method reference compatibility check - note that param check
3807 //is a no-op (as this has been taken care during method applicability)
3808 boolean isSpeculativeRound =
3809 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3810
3811 that.type = currentTarget; //avoids recovery at this stage
3812 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3813 if (!isSpeculativeRound) {
3814 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3815 }
3816 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3817 } catch (Types.FunctionDescriptorLookupError ex) {
3818 JCDiagnostic cause = ex.getDiagnostic();
3819 resultInfo.checkContext.report(that, cause);
3820 result = that.type = types.createErrorType(pt());
3821 return;
3822 }
3823 }
3824 //where
3825 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3826 //if this is a constructor reference, the expected kind must be a type
3827 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3828 KindSelector.VAL_TYP : KindSelector.TYP,
3829 Type.noType);
3830 }
3831
3832
3833 @SuppressWarnings("fallthrough")
3834 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3835 InferenceContext inferenceContext = checkContext.inferenceContext();
3836 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3837
3838 Type resType;
3839 switch (tree.getMode()) {
3840 case NEW:
3841 if (!tree.expr.type.isRaw()) {
3842 resType = tree.expr.type;
3843 break;
3844 }
3845 default:
3846 resType = refType.getReturnType();
3847 }
3848
3849 Type incompatibleReturnType = resType;
3850
3851 if (returnType.hasTag(VOID)) {
3852 incompatibleReturnType = null;
3853 }
3854
3855 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3856 if (resType.isErroneous() ||
3857 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3858 checkContext.checkWarner(tree, resType, returnType))) {
3859 incompatibleReturnType = null;
3860 }
3861 }
3862
3863 if (incompatibleReturnType != null) {
3864 Fragment msg =
3865 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3866 checkContext.report(tree, diags.fragment(msg));
3867 } else {
3868 if (inferenceContext.free(refType)) {
3869 // we need to wait for inference to finish and then replace inference vars in the referent type
3870 inferenceContext.addFreeTypeListener(List.of(refType),
3871 instantiatedContext -> {
3872 tree.referentType = instantiatedContext.asInstType(refType);
3873 });
3874 } else {
3875 tree.referentType = refType;
3876 }
3877 }
3878
3879 if (!speculativeAttr) {
3880 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3881 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3882 }
3883 }
3884 }
3885
3886 boolean checkExConstraints(
3887 List<Type> thrownByFuncExpr,
3888 List<Type> thrownAtFuncType,
3889 InferenceContext inferenceContext) {
3890 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3891 * are not proper types
3892 */
3893 List<Type> nonProperList = thrownAtFuncType.stream()
3894 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3895 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3896
3897 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3898 * in the throws clause of the invocation type of the method reference's compile-time
3899 * declaration
3900 */
3901 List<Type> checkedList = thrownByFuncExpr.stream()
3902 .filter(e -> chk.isChecked(e)).collect(List.collector());
3903
3904 /** If n = 0 (the function type's throws clause consists only of proper types), then
3905 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3906 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3907 * reduces to true
3908 */
3909 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3910 for (Type checked : checkedList) {
3911 boolean isSubtype = false;
3912 for (Type proper : properList) {
3913 if (types.isSubtype(checked, proper)) {
3914 isSubtype = true;
3915 break;
3916 }
3917 }
3918 if (!isSubtype) {
3919 uncaughtByProperTypes.add(checked);
3920 }
3921 }
3922
3923 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3924 return false;
3925 }
3926
3927 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3928 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3929 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3930 */
3931 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3932 uncaughtByProperTypes.forEach(checkedEx -> {
3933 nonProperAsUndet.forEach(nonProper -> {
3934 types.isSubtype(checkedEx, nonProper);
3935 });
3936 });
3937
3938 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3939 */
3940 nonProperAsUndet.stream()
3941 .filter(t -> t.hasTag(UNDETVAR))
3942 .forEach(t -> ((UndetVar)t).setThrow());
3943 return true;
3944 }
3945
3946 /**
3947 * Set functional type info on the underlying AST. Note: as the target descriptor
3948 * might contain inference variables, we might need to register an hook in the
3949 * current inference context.
3950 */
3951 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3952 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3953 if (checkContext.inferenceContext().free(descriptorType)) {
3954 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3955 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3956 inferenceContext.asInstType(primaryTarget), checkContext));
3957 } else {
3958 if (pt.hasTag(CLASS)) {
3959 fExpr.target = primaryTarget;
3960 }
3961 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3962 pt != Type.recoveryType) {
3963 //check that functional interface class is well-formed
3964 try {
3965 /* Types.makeFunctionalInterfaceClass() may throw an exception
3966 * when it's executed post-inference. See the listener code
3967 * above.
3968 */
3969 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3970 names.empty, fExpr.target, ABSTRACT);
3971 if (csym != null) {
3972 chk.checkImplementations(env.tree, csym, csym);
3973 try {
3974 //perform an additional functional interface check on the synthetic class,
3975 //as there may be spurious errors for raw targets - because of existing issues
3976 //with membership and inheritance (see JDK-8074570).
3977 csym.flags_field |= INTERFACE;
3978 types.findDescriptorType(csym.type);
3979 } catch (FunctionDescriptorLookupError err) {
3980 resultInfo.checkContext.report(fExpr,
3981 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3982 }
3983 }
3984 } catch (Types.FunctionDescriptorLookupError ex) {
3985 JCDiagnostic cause = ex.getDiagnostic();
3986 resultInfo.checkContext.report(env.tree, cause);
3987 }
3988 }
3989 }
3990 }
3991
3992 public void visitParens(JCParens tree) {
3993 Type owntype = attribTree(tree.expr, env, resultInfo);
3994 result = check(tree, owntype, pkind(), resultInfo);
3995 Symbol sym = TreeInfo.symbol(tree);
3996 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3997 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3998 }
3999
4000 public void visitAssign(JCAssign tree) {
4001 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4002 Type capturedType = capture(owntype);
4003 attribExpr(tree.rhs, env, owntype);
4004 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4005 }
4006
4007 public void visitAssignop(JCAssignOp tree) {
4008 // Attribute arguments.
4009 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4010 Type operand = attribExpr(tree.rhs, env);
4011 // Find operator.
4012 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4013 if (operator != operators.noOpSymbol &&
4014 !owntype.isErroneous() &&
4015 !operand.isErroneous()) {
4016 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4017 chk.checkCastable(tree.rhs.pos(),
4018 operator.type.getReturnType(),
4019 owntype);
4020 }
4021 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4022 }
4023
4024 public void visitUnary(JCUnary tree) {
4025 // Attribute arguments.
4026 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4027 ? attribTree(tree.arg, env, varAssignmentInfo)
4028 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4029
4030 // Find operator.
4031 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4032 Type owntype = types.createErrorType(tree.type);
4033 if (operator != operators.noOpSymbol &&
4034 !argtype.isErroneous()) {
4035 owntype = (tree.getTag().isIncOrDecUnaryOp())
4036 ? tree.arg.type
4037 : operator.type.getReturnType();
4038 int opc = operator.opcode;
4039
4040 // If the argument is constant, fold it.
4041 if (argtype.constValue() != null) {
4042 Type ctype = cfolder.fold1(opc, argtype);
4043 if (ctype != null) {
4044 owntype = cfolder.coerce(ctype, owntype);
4045 }
4046 }
4047 }
4048 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4049 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4050 }
4051
4052 public void visitBinary(JCBinary tree) {
4053 // Attribute arguments.
4054 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4055 // x && y
4056 // include x's bindings when true in y
4057
4058 // x || y
4059 // include x's bindings when false in y
4060
4061 MatchBindings lhsBindings = matchBindings;
4062 List<BindingSymbol> propagatedBindings;
4063 switch (tree.getTag()) {
4064 case AND:
4065 propagatedBindings = lhsBindings.bindingsWhenTrue;
4066 break;
4067 case OR:
4068 propagatedBindings = lhsBindings.bindingsWhenFalse;
4069 break;
4070 default:
4071 propagatedBindings = List.nil();
4072 break;
4073 }
4074 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4075 Type right;
4076 try {
4077 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4078 } finally {
4079 rhsEnv.info.scope.leave();
4080 }
4081
4082 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4083
4084 // Find operator.
4085 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4086 Type owntype = types.createErrorType(tree.type);
4087 if (operator != operators.noOpSymbol &&
4088 !left.isErroneous() &&
4089 !right.isErroneous()) {
4090 owntype = operator.type.getReturnType();
4091 int opc = operator.opcode;
4092 // If both arguments are constants, fold them.
4093 if (left.constValue() != null && right.constValue() != null) {
4094 Type ctype = cfolder.fold2(opc, left, right);
4095 if (ctype != null) {
4096 owntype = cfolder.coerce(ctype, owntype);
4097 }
4098 }
4099
4100 // Check that argument types of a reference ==, != are
4101 // castable to each other, (JLS 15.21). Note: unboxing
4102 // comparisons will not have an acmp* opc at this point.
4103 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4104 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4105 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4106 }
4107 chk.checkForSuspectClassLiteralComparison(tree, left, right);
4108 }
4109
4110 chk.checkDivZero(tree.rhs.pos(), operator, right);
4111 }
4112 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4113 }
4114
4115 public void visitTypeCast(final JCTypeCast tree) {
4116 Type clazztype = attribType(tree.clazz, env);
4117 chk.validate(tree.clazz, env, false);
4118 //a fresh environment is required for 292 inference to work properly ---
4119 //see Infer.instantiatePolymorphicSignatureInstance()
4120 Env<AttrContext> localEnv = env.dup(tree);
4121 //should we propagate the target type?
4122 final ResultInfo castInfo;
4123 JCExpression expr = TreeInfo.skipParens(tree.expr);
4124 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4125 if (isPoly) {
4126 //expression is a poly - we need to propagate target type info
4127 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4128 new Check.NestedCheckContext(resultInfo.checkContext) {
4129 @Override
4130 public boolean compatible(Type found, Type req, Warner warn) {
4131 return types.isCastable(found, req, warn);
4132 }
4133 });
4134 } else {
4135 //standalone cast - target-type info is not propagated
4136 castInfo = unknownExprInfo;
4137 }
4138 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4139 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4140 if (exprtype.constValue() != null)
4141 owntype = cfolder.coerce(exprtype, owntype);
4142 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4143 if (!isPoly)
4144 chk.checkRedundantCast(localEnv, tree);
4145 }
4146
4147 public void visitTypeTest(JCInstanceOf tree) {
4148 Type exprtype = chk.checkNullOrRefType(
4149 tree.expr.pos(), attribExpr(tree.expr, env));
4150 Type clazztype;
4151 JCTree typeTree;
4152 if (tree.pattern.getTag() == BINDINGPATTERN ||
4153 tree.pattern.getTag() == PARENTHESIZEDPATTERN) {
4154 attribTree(tree.pattern, env, unknownExprInfo);
4155 clazztype = tree.pattern.type;
4156 if (types.isSubtype(exprtype, clazztype) &&
4157 !exprtype.isErroneous() && !clazztype.isErroneous()) {
4158 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4159 }
4160 typeTree = TreeInfo.primaryPatternTree((JCPattern) tree.pattern).var.vartype;
4161 } else {
4162 clazztype = attribType(tree.pattern, env);
4163 typeTree = tree.pattern;
4164 chk.validate(typeTree, env, false);
4165 }
4166 if (!clazztype.hasTag(TYPEVAR)) {
4167 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4168 }
4169 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4170 boolean valid = false;
4171 if (allowReifiableTypesInInstanceof) {
4172 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4173 } else {
4174 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4175 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4176 allowReifiableTypesInInstanceof = true;
4177 }
4178 if (!valid) {
4179 clazztype = types.createErrorType(clazztype);
4180 }
4181 }
4182 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4183 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4184 }
4185
4186 private boolean checkCastablePattern(DiagnosticPosition pos,
4187 Type exprType,
4188 Type pattType) {
4189 Warner warner = new Warner();
4190 if (!types.isCastable(exprType, pattType, warner)) {
4191 chk.basicHandler.report(pos,
4192 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4193 return false;
4194 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4195 log.error(pos,
4196 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4197 return false;
4198 } else {
4199 return true;
4200 }
4201 }
4202
4203 public void visitBindingPattern(JCBindingPattern tree) {
4204 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
4205 tree.type = tree.var.type = attribTree(tree.var.vartype, env, varInfo);
4206 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, tree.var.vartype.type, env.info.scope.owner);
4207 v.pos = tree.pos;
4208 tree.var.sym = v;
4209 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4210 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4211 }
4212 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4213 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4214 annotate.flush();
4215 chk.validate(tree.var.vartype, env, true);
4216 result = tree.type;
4217 matchBindings = new MatchBindings(List.of(v), List.nil());
4218 }
4219
4220 @Override
4221 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4222 attribExpr(tree.pattern, env);
4223 result = tree.type = tree.pattern.type;
4224 }
4225
4226 @Override
4227 public void visitGuardPattern(JCGuardPattern tree) {
4228 attribExpr(tree.patt, env);
4229 MatchBindings afterPattern = matchBindings;
4230 Env<AttrContext> bodyEnv = bindingEnv(env, matchBindings.bindingsWhenTrue);
4231 try {
4232 attribExpr(tree.expr, bodyEnv, syms.booleanType);
4233 } finally {
4234 bodyEnv.info.scope.leave();
4235 }
4236 result = tree.type = tree.patt.type;
4237 matchBindings = matchBindingsComputer.guardedPattern(tree, afterPattern, matchBindings);
4238 }
4239
4240 public void visitIndexed(JCArrayAccess tree) {
4241 Type owntype = types.createErrorType(tree.type);
4242 Type atype = attribExpr(tree.indexed, env);
4243 attribExpr(tree.index, env, syms.intType);
4244 if (types.isArray(atype))
4245 owntype = types.elemtype(atype);
4246 else if (!atype.hasTag(ERROR))
4247 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4248 if (!pkind().contains(KindSelector.VAL))
4249 owntype = capture(owntype);
4250 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4251 }
4252
4253 public void visitIdent(JCIdent tree) {
4254 Symbol sym;
4255
4256 // Find symbol
4257 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4258 // If we are looking for a method, the prototype `pt' will be a
4259 // method type with the type of the call's arguments as parameters.
4260 env.info.pendingResolutionPhase = null;
4261 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4262 } else if (tree.sym != null && tree.sym.kind != VAR) {
4263 sym = tree.sym;
4264 } else {
4265 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4266 }
4267 tree.sym = sym;
4268
4269 // Also find the environment current for the class where
4270 // sym is defined (`symEnv').
4271 Env<AttrContext> symEnv = env;
4272 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4273 sym.kind.matches(KindSelector.VAL_MTH) &&
4274 sym.owner.kind == TYP &&
4275 tree.name != names._this && tree.name != names._super) {
4276
4277 // Find environment in which identifier is defined.
4278 while (symEnv.outer != null &&
4279 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4280 symEnv = symEnv.outer;
4281 }
4282 }
4283
4284 // If symbol is a variable, ...
4285 if (sym.kind == VAR) {
4286 VarSymbol v = (VarSymbol)sym;
4287
4288 // ..., evaluate its initializer, if it has one, and check for
4289 // illegal forward reference.
4290 checkInit(tree, env, v, false);
4291
4292 // If we are expecting a variable (as opposed to a value), check
4293 // that the variable is assignable in the current environment.
4294 if (KindSelector.ASG.subset(pkind()))
4295 checkAssignable(tree.pos(), v, null, env);
4296 }
4297
4298 // In a constructor body,
4299 // if symbol is a field or instance method, check that it is
4300 // not accessed before the supertype constructor is called.
4301 if (symEnv.info.isSelfCall &&
4302 sym.kind.matches(KindSelector.VAL_MTH) &&
4303 sym.owner.kind == TYP &&
4304 (sym.flags() & STATIC) == 0) {
4305 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4306 sym : thisSym(tree.pos(), env));
4307 }
4308 Env<AttrContext> env1 = env;
4309 if (sym.kind != ERR && sym.kind != TYP &&
4310 sym.owner != null && sym.owner != env1.enclClass.sym) {
4311 // If the found symbol is inaccessible, then it is
4312 // accessed through an enclosing instance. Locate this
4313 // enclosing instance:
4314 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4315 env1 = env1.outer;
4316 }
4317
4318 if (env.info.isSerializable) {
4319 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4320 }
4321
4322 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4323 }
4324
4325 public void visitSelect(JCFieldAccess tree) {
4326 // Determine the expected kind of the qualifier expression.
4327 KindSelector skind = KindSelector.NIL;
4328 if (tree.name == names._this || tree.name == names._super ||
4329 tree.name == names._class)
4330 {
4331 skind = KindSelector.TYP;
4332 } else {
4333 if (pkind().contains(KindSelector.PCK))
4334 skind = KindSelector.of(skind, KindSelector.PCK);
4335 if (pkind().contains(KindSelector.TYP))
4336 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4337 if (pkind().contains(KindSelector.VAL_MTH))
4338 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4339 }
4340
4341 // Attribute the qualifier expression, and determine its symbol (if any).
4342 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4343 Assert.check(site == tree.selected.type);
4344 if (tree.name == names._class && site.isPrimitiveClass()) {
4345 /* JDK-8269956: Where a reflective (class) literal is needed, the unqualified Point.class is
4346 * always the "primary" mirror - representing the primitive reference runtime type - thereby
4347 * always matching the behavior of Object::getClass
4348 */
4349 if (!tree.selected.hasTag(SELECT) || ((JCFieldAccess) tree.selected).name != names.val) {
4350 tree.selected.setType(site = site.referenceProjection());
4351 }
4352 }
4353 if (!pkind().contains(KindSelector.TYP_PCK))
4354 site = capture(site); // Capture field access
4355
4356 // don't allow T.class T[].class, etc
4357 if (skind == KindSelector.TYP) {
4358 Type elt = site;
4359 while (elt.hasTag(ARRAY))
4360 elt = ((ArrayType)elt).elemtype;
4361 if (elt.hasTag(TYPEVAR)) {
4362 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4363 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4364 tree.sym = tree.type.tsym;
4365 return;
4366 }
4367 }
4368
4369 // If qualifier symbol is a type or `super', assert `selectSuper'
4370 // for the selection. This is relevant for determining whether
4371 // protected symbols are accessible.
4372 Symbol sitesym = TreeInfo.symbol(tree.selected);
4373
4374 boolean selectSuperPrev = env.info.selectSuper;
4375 env.info.selectSuper =
4376 sitesym != null &&
4377 sitesym.name == names._super;
4378
4379 // Determine the symbol represented by the selection.
4380 env.info.pendingResolutionPhase = null;
4381 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4382 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4383 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4384 sym = syms.errSymbol;
4385 }
4386 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4387 site = capture(site);
4388 sym = selectSym(tree, sitesym, site, env, resultInfo);
4389 }
4390 boolean varArgs = env.info.lastResolveVarargs();
4391 tree.sym = sym;
4392
4393 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4394 site = types.skipTypeVars(site, true);
4395 }
4396
4397 // If that symbol is a variable, ...
4398 if (sym.kind == VAR) {
4399 VarSymbol v = (VarSymbol)sym;
4400
4401 // ..., evaluate its initializer, if it has one, and check for
4402 // illegal forward reference.
4403 checkInit(tree, env, v, true);
4404
4405 // If we are expecting a variable (as opposed to a value), check
4406 // that the variable is assignable in the current environment.
4407 if (KindSelector.ASG.subset(pkind()))
4408 checkAssignable(tree.pos(), v, tree.selected, env);
4409 }
4410
4411 if (sitesym != null &&
4412 sitesym.kind == VAR &&
4413 ((VarSymbol)sitesym).isResourceVariable() &&
4414 sym.kind == MTH &&
4415 sym.name.equals(names.close) &&
4416 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4417 env.info.lint.isEnabled(LintCategory.TRY)) {
4418 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4419 }
4420
4421 // Disallow selecting a type from an expression
4422 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4423 tree.type = check(tree.selected, pt(),
4424 sitesym == null ?
4425 KindSelector.VAL : sitesym.kind.toSelector(),
4426 new ResultInfo(KindSelector.TYP_PCK, pt()));
4427 }
4428
4429 if (isType(sitesym)) {
4430 if (sym.name == names._this || sym.name == names._super) {
4431 // If `C' is the currently compiled class, check that
4432 // `C.this' does not appear in an explicit call to a constructor
4433 // also make sure that `super` is not used in constructor invocations
4434 if (env.info.isSelfCall &&
4435 ((sym.name == names._this &&
4436 site.tsym == env.enclClass.sym) ||
4437 sym.name == names._super && env.info.constructorArgs &&
4438 (sitesym.isInterface() || site.tsym == env.enclClass.sym))) {
4439 chk.earlyRefError(tree.pos(), sym);
4440 }
4441 } else {
4442 // Check if type-qualified fields or methods are static (JLS)
4443 if ((sym.flags() & STATIC) == 0 &&
4444 sym.name != names._super &&
4445 (sym.kind == VAR || sym.kind == MTH)) {
4446 rs.accessBase(rs.new StaticError(sym),
4447 tree.pos(), site, sym.name, true);
4448 }
4449 }
4450 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
4451 sym.isStatic() && sym.kind == MTH) {
4452 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
4453 }
4454 } else if (sym.kind != ERR &&
4455 (sym.flags() & STATIC) != 0 &&
4456 sym.name != names._class) {
4457 // If the qualified item is not a type and the selected item is static, report
4458 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4459 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4460 }
4461
4462 // If we are selecting an instance member via a `super', ...
4463 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4464
4465 // Check that super-qualified symbols are not abstract (JLS)
4466 rs.checkNonAbstract(tree.pos(), sym);
4467
4468 if (site.isRaw()) {
4469 // Determine argument types for site.
4470 Type site1 = types.asSuper(env.enclClass.sym.type.referenceProjectionOrSelf(), site.tsym);
4471 if (site1 != null) site = site1;
4472 }
4473 }
4474
4475 if (env.info.isSerializable) {
4476 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4477 }
4478
4479 env.info.selectSuper = selectSuperPrev;
4480 result = checkId(tree, site, sym, env, resultInfo);
4481 }
4482 //where
4483 /** Determine symbol referenced by a Select expression,
4484 *
4485 * @param tree The select tree.
4486 * @param site The type of the selected expression,
4487 * @param env The current environment.
4488 * @param resultInfo The current result.
4489 */
4490 private Symbol selectSym(JCFieldAccess tree,
4491 Symbol location,
4492 Type site,
4493 Env<AttrContext> env,
4494 ResultInfo resultInfo) {
4495 DiagnosticPosition pos = tree.pos();
4496 Name name = tree.name;
4497 switch (site.getTag()) {
4498 case PACKAGE:
4499 return rs.accessBase(
4500 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4501 pos, location, site, name, true);
4502 case ARRAY:
4503 case CLASS:
4504 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4505 return rs.resolveQualifiedMethod(
4506 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4507 } else if (name == names._this || name == names._super) {
4508 return rs.resolveSelf(pos, env, site.tsym, name);
4509 } else if (name == names._class) {
4510 // In this case, we have already made sure in
4511 // visitSelect that qualifier expression is a type.
4512 return syms.getClassField(site, types);
4513 } else if (site.isPrimitiveClass() && isType(location) && resultInfo.pkind.contains(KindSelector.TYP) && (name == names.ref || name == names.val)) {
4514 return site.tsym;
4515 } else {
4516 // We are seeing a plain identifier as selector.
4517 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4518 sym = rs.accessBase(sym, pos, location, site, name, true);
4519 return sym;
4520 }
4521 case WILDCARD:
4522 throw new AssertionError(tree);
4523 case TYPEVAR:
4524 // Normally, site.getUpperBound() shouldn't be null.
4525 // It should only happen during memberEnter/attribBase
4526 // when determining the super type which *must* be
4527 // done before attributing the type variables. In
4528 // other words, we are seeing this illegal program:
4529 // class B<T> extends A<T.foo> {}
4530 Symbol sym = (site.getUpperBound() != null)
4531 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4532 : null;
4533 if (sym == null) {
4534 log.error(pos, Errors.TypeVarCantBeDeref);
4535 return syms.errSymbol;
4536 } else {
4537 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4538 rs.new AccessError(env, site, sym) :
4539 sym;
4540 rs.accessBase(sym2, pos, location, site, name, true);
4541 return sym;
4542 }
4543 case ERROR:
4544 // preserve identifier names through errors
4545 return types.createErrorType(name, site.tsym, site).tsym;
4546 default:
4547 // The qualifier expression is of a primitive type -- only
4548 // .class is allowed for these.
4549 if (name == names._class) {
4550 // In this case, we have already made sure in Select that
4551 // qualifier expression is a type.
4552 return syms.getClassField(site, types);
4553 } else {
4554 log.error(pos, Errors.CantDeref(site));
4555 return syms.errSymbol;
4556 }
4557 }
4558 }
4559
4560 /** Determine type of identifier or select expression and check that
4561 * (1) the referenced symbol is not deprecated
4562 * (2) the symbol's type is safe (@see checkSafe)
4563 * (3) if symbol is a variable, check that its type and kind are
4564 * compatible with the prototype and protokind.
4565 * (4) if symbol is an instance field of a raw type,
4566 * which is being assigned to, issue an unchecked warning if its
4567 * type changes under erasure.
4568 * (5) if symbol is an instance method of a raw type, issue an
4569 * unchecked warning if its argument types change under erasure.
4570 * If checks succeed:
4571 * If symbol is a constant, return its constant type
4572 * else if symbol is a method, return its result type
4573 * otherwise return its type.
4574 * Otherwise return errType.
4575 *
4576 * @param tree The syntax tree representing the identifier
4577 * @param site If this is a select, the type of the selected
4578 * expression, otherwise the type of the current class.
4579 * @param sym The symbol representing the identifier.
4580 * @param env The current environment.
4581 * @param resultInfo The expected result
4582 */
4583 Type checkId(JCTree tree,
4584 Type site,
4585 Symbol sym,
4586 Env<AttrContext> env,
4587 ResultInfo resultInfo) {
4588 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4589 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4590 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4591 }
4592
4593 Type checkMethodIdInternal(JCTree tree,
4594 Type site,
4595 Symbol sym,
4596 Env<AttrContext> env,
4597 ResultInfo resultInfo) {
4598 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4599 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4600 } else {
4601 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4602 }
4603 }
4604
4605 Type checkIdInternal(JCTree tree,
4606 Type site,
4607 Symbol sym,
4608 Type pt,
4609 Env<AttrContext> env,
4610 ResultInfo resultInfo) {
4611 if (pt.isErroneous()) {
4612 return types.createErrorType(site);
4613 }
4614 Type owntype; // The computed type of this identifier occurrence.
4615 switch (sym.kind) {
4616 case TYP:
4617 // For types, the computed type equals the symbol's type,
4618 // except for three situations:
4619 owntype = sym.type;
4620 if (owntype.hasTag(CLASS)) {
4621 Assert.check(owntype.getFlavor() != Flavor.X_Typeof_X);
4622 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4623 Type ownOuter = owntype.getEnclosingType();
4624
4625 // (a) If symbol is a primitive class and its reference projection
4626 // is requested via the .ref notation, then adjust the computed type to
4627 // reflect this.
4628 if (owntype.isPrimitiveClass() && tree.hasTag(SELECT) && ((JCFieldAccess) tree).name == names.ref) {
4629 owntype = new ClassType(owntype.getEnclosingType(), owntype.getTypeArguments(), (TypeSymbol)sym, owntype.getMetadata(), Flavor.L_TypeOf_Q);
4630 }
4631
4632 // (b) If the symbol's type is parameterized, erase it
4633 // because no type parameters were given.
4634 // We recover generic outer type later in visitTypeApply.
4635 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4636 owntype = types.erasure(owntype);
4637 }
4638
4639 // (c) If the symbol's type is an inner class, then
4640 // we have to interpret its outer type as a superclass
4641 // of the site type. Example:
4642 //
4643 // class Tree<A> { class Visitor { ... } }
4644 // class PointTree extends Tree<Point> { ... }
4645 // ...PointTree.Visitor...
4646 //
4647 // Then the type of the last expression above is
4648 // Tree<Point>.Visitor.
4649 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4650 Type normOuter = site;
4651 if (normOuter.hasTag(CLASS)) {
4652 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4653 }
4654 if (normOuter == null) // perhaps from an import
4655 normOuter = types.erasure(ownOuter);
4656 if (normOuter != ownOuter)
4657 owntype = new ClassType(
4658 normOuter, List.nil(), owntype.tsym,
4659 owntype.getMetadata(), owntype.getFlavor());
4660 }
4661 }
4662 break;
4663 case VAR:
4664 VarSymbol v = (VarSymbol)sym;
4665
4666 if (env.info.enclVar != null
4667 && v.type.hasTag(NONE)) {
4668 //self reference to implicitly typed variable declaration
4669 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4670 return v.type = types.createErrorType(v.type);
4671 }
4672
4673 // Test (4): if symbol is an instance field of a raw type,
4674 // which is being assigned to, issue an unchecked warning if
4675 // its type changes under erasure.
4676 if (KindSelector.ASG.subset(pkind()) &&
4677 v.owner.kind == TYP &&
4678 (v.flags() & STATIC) == 0 &&
4679 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4680 Type s = types.asOuterSuper(site, v.owner);
4681 if (s != null &&
4682 s.isRaw() &&
4683 !types.isSameType(v.type, v.erasure(types))) {
4684 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4685 }
4686 }
4687 // The computed type of a variable is the type of the
4688 // variable symbol, taken as a member of the site type.
4689 owntype = (sym.owner.kind == TYP &&
4690 sym.name != names._this && sym.name != names._super)
4691 ? types.memberType(site, sym)
4692 : sym.type;
4693
4694 // If the variable is a constant, record constant value in
4695 // computed type.
4696 if (v.getConstValue() != null && isStaticReference(tree))
4697 owntype = owntype.constType(v.getConstValue());
4698
4699 if (resultInfo.pkind == KindSelector.VAL) {
4700 owntype = capture(owntype); // capture "names as expressions"
4701 }
4702 break;
4703 case MTH: {
4704 owntype = checkMethod(site, sym,
4705 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4706 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4707 resultInfo.pt.getTypeArguments());
4708 break;
4709 }
4710 case PCK: case ERR:
4711 owntype = sym.type;
4712 break;
4713 default:
4714 throw new AssertionError("unexpected kind: " + sym.kind +
4715 " in tree " + tree);
4716 }
4717
4718 // Emit a `deprecation' warning if symbol is deprecated.
4719 // (for constructors (but not for constructor references), the error
4720 // was given when the constructor was resolved)
4721
4722 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4723 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4724 chk.checkSunAPI(tree.pos(), sym);
4725 chk.checkProfile(tree.pos(), sym);
4726 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4727 }
4728
4729 // If symbol is a variable, check that its type and
4730 // kind are compatible with the prototype and protokind.
4731 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4732 }
4733
4734 /** Check that variable is initialized and evaluate the variable's
4735 * initializer, if not yet done. Also check that variable is not
4736 * referenced before it is defined.
4737 * @param tree The tree making up the variable reference.
4738 * @param env The current environment.
4739 * @param v The variable's symbol.
4740 */
4741 private void checkInit(JCTree tree,
4742 Env<AttrContext> env,
4743 VarSymbol v,
4744 boolean onlyWarning) {
4745 // A forward reference is diagnosed if the declaration position
4746 // of the variable is greater than the current tree position
4747 // and the tree and variable definition occur in the same class
4748 // definition. Note that writes don't count as references.
4749 // This check applies only to class and instance
4750 // variables. Local variables follow different scope rules,
4751 // and are subject to definite assignment checking.
4752 Env<AttrContext> initEnv = enclosingInitEnv(env);
4753 if (initEnv != null &&
4754 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4755 v.owner.kind == TYP &&
4756 v.owner == env.info.scope.owner.enclClass() &&
4757 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4758 (!env.tree.hasTag(ASSIGN) ||
4759 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4760 if (!onlyWarning || isStaticEnumField(v)) {
4761 Error errkey = (initEnv.info.enclVar == v) ?
4762 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4763 log.error(tree.pos(), errkey);
4764 } else if (useBeforeDeclarationWarning) {
4765 Warning warnkey = (initEnv.info.enclVar == v) ?
4766 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4767 log.warning(tree.pos(), warnkey);
4768 }
4769 }
4770
4771 v.getConstValue(); // ensure initializer is evaluated
4772
4773 checkEnumInitializer(tree, env, v);
4774 }
4775
4776 /**
4777 * Returns the enclosing init environment associated with this env (if any). An init env
4778 * can be either a field declaration env or a static/instance initializer env.
4779 */
4780 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4781 while (true) {
4782 switch (env.tree.getTag()) {
4783 case VARDEF:
4784 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4785 if (vdecl.sym.owner.kind == TYP) {
4786 //field
4787 return env;
4788 }
4789 break;
4790 case BLOCK:
4791 if (env.next.tree.hasTag(CLASSDEF)) {
4792 //instance/static initializer
4793 return env;
4794 }
4795 break;
4796 case METHODDEF:
4797 case CLASSDEF:
4798 case TOPLEVEL:
4799 return null;
4800 }
4801 Assert.checkNonNull(env.next);
4802 env = env.next;
4803 }
4804 }
4805
4806 /**
4807 * Check for illegal references to static members of enum. In
4808 * an enum type, constructors and initializers may not
4809 * reference its static members unless they are constant.
4810 *
4811 * @param tree The tree making up the variable reference.
4812 * @param env The current environment.
4813 * @param v The variable's symbol.
4814 * @jls 8.9 Enum Types
4815 */
4816 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4817 // JLS:
4818 //
4819 // "It is a compile-time error to reference a static field
4820 // of an enum type that is not a compile-time constant
4821 // (15.28) from constructors, instance initializer blocks,
4822 // or instance variable initializer expressions of that
4823 // type. It is a compile-time error for the constructors,
4824 // instance initializer blocks, or instance variable
4825 // initializer expressions of an enum constant e to refer
4826 // to itself or to an enum constant of the same type that
4827 // is declared to the right of e."
4828 if (isStaticEnumField(v)) {
4829 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4830
4831 if (enclClass == null || enclClass.owner == null)
4832 return;
4833
4834 // See if the enclosing class is the enum (or a
4835 // subclass thereof) declaring v. If not, this
4836 // reference is OK.
4837 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4838 return;
4839
4840 // If the reference isn't from an initializer, then
4841 // the reference is OK.
4842 if (!Resolve.isInitializer(env))
4843 return;
4844
4845 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4846 }
4847 }
4848
4849 /** Is the given symbol a static, non-constant field of an Enum?
4850 * Note: enum literals should not be regarded as such
4851 */
4852 private boolean isStaticEnumField(VarSymbol v) {
4853 return Flags.isEnum(v.owner) &&
4854 Flags.isStatic(v) &&
4855 !Flags.isConstant(v) &&
4856 v.name != names._class;
4857 }
4858
4859 /**
4860 * Check that method arguments conform to its instantiation.
4861 **/
4862 public Type checkMethod(Type site,
4863 final Symbol sym,
4864 ResultInfo resultInfo,
4865 Env<AttrContext> env,
4866 final List<JCExpression> argtrees,
4867 List<Type> argtypes,
4868 List<Type> typeargtypes) {
4869 // Test (5): if symbol is an instance method of a raw type, issue
4870 // an unchecked warning if its argument types change under erasure.
4871 if ((sym.flags() & STATIC) == 0 &&
4872 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4873 Type s = types.asOuterSuper(site, sym.owner);
4874 if (s != null && s.isRaw() &&
4875 !types.isSameTypes(sym.type.getParameterTypes(),
4876 sym.erasure(types).getParameterTypes())) {
4877 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4878 }
4879 }
4880
4881 if (env.info.defaultSuperCallSite != null) {
4882 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4883 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4884 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4885 List<MethodSymbol> icand_sup =
4886 types.interfaceCandidates(sup, (MethodSymbol)sym);
4887 if (icand_sup.nonEmpty() &&
4888 icand_sup.head != sym &&
4889 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4890 log.error(env.tree.pos(),
4891 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4892 break;
4893 }
4894 }
4895 env.info.defaultSuperCallSite = null;
4896 }
4897
4898 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4899 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4900 if (app.meth.hasTag(SELECT) &&
4901 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4902 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4903 }
4904 }
4905
4906 // Compute the identifier's instantiated type.
4907 // For methods, we need to compute the instance type by
4908 // Resolve.instantiate from the symbol's type as well as
4909 // any type arguments and value arguments.
4910 Warner noteWarner = new Warner();
4911 try {
4912 Type owntype = rs.checkMethod(
4913 env,
4914 site,
4915 sym,
4916 resultInfo,
4917 argtypes,
4918 typeargtypes,
4919 noteWarner);
4920
4921 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4922 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4923
4924 argtypes = argtypes.map(checkDeferredMap);
4925
4926 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4927 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4928 sym.name,
4929 rs.methodArguments(sym.type.getParameterTypes()),
4930 rs.methodArguments(argtypes.map(checkDeferredMap)),
4931 kindName(sym.location()),
4932 sym.location()));
4933 if (resultInfo.pt != Infer.anyPoly ||
4934 !owntype.hasTag(METHOD) ||
4935 !owntype.isPartial()) {
4936 //if this is not a partially inferred method type, erase return type. Otherwise,
4937 //erasure is carried out in PartiallyInferredMethodType.check().
4938 owntype = new MethodType(owntype.getParameterTypes(),
4939 types.erasure(owntype.getReturnType()),
4940 types.erasure(owntype.getThrownTypes()),
4941 syms.methodClass);
4942 }
4943 }
4944
4945 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4946 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4947 PolyKind.POLY : PolyKind.STANDALONE;
4948 TreeInfo.setPolyKind(env.tree, pkind);
4949
4950 return (resultInfo.pt == Infer.anyPoly) ?
4951 owntype :
4952 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4953 resultInfo.checkContext.inferenceContext());
4954 } catch (Infer.InferenceException ex) {
4955 //invalid target type - propagate exception outwards or report error
4956 //depending on the current check context
4957 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4958 return types.createErrorType(site);
4959 } catch (Resolve.InapplicableMethodException ex) {
4960 final JCDiagnostic diag = ex.getDiagnostic();
4961 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4962 @Override
4963 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4964 return new Pair<>(sym, diag);
4965 }
4966 };
4967 List<Type> argtypes2 = argtypes.map(
4968 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4969 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4970 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4971 log.report(errDiag);
4972 return types.createErrorType(site);
4973 }
4974 }
4975
4976 public void visitDefaultValue(JCDefaultValue tree) {
4977 if (!allowPrimitiveClasses) {
4978 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4979 Feature.PRIMITIVE_CLASSES.error(sourceName));
4980 }
4981
4982 // Attribute the qualifier expression, and determine its symbol (if any).
4983 Type site = attribTree(tree.clazz, env, new ResultInfo(KindSelector.TYP_PCK, Type.noType));
4984 if (!pkind().contains(KindSelector.TYP_PCK))
4985 site = capture(site); // Capture field access
4986
4987 Symbol sym = switch (site.getTag()) {
4988 case WILDCARD -> throw new AssertionError(tree);
4989 case PACKAGE -> {
4990 log.error(tree.pos, Errors.CantResolveLocation(Kinds.KindName.CLASS, site.tsym.getQualifiedName(), null, null,
4991 Fragments.Location(Kinds.typeKindName(env.enclClass.type), env.enclClass.type, null)));
4992 yield syms.errSymbol;
4993 }
4994 case ERROR -> types.createErrorType(names._default, site.tsym, site).tsym;
4995 default -> new VarSymbol(STATIC, names._default, site, site.tsym);
4996 };
4997
4998 if (site.hasTag(TYPEVAR) && sym.kind != ERR) {
4999 site = types.skipTypeVars(site, true);
5000 }
5001 result = checkId(tree, site, sym, env, resultInfo);
5002 }
5003
5004 public void visitLiteral(JCLiteral tree) {
5005 result = check(tree, litType(tree.typetag).constType(tree.value),
5006 KindSelector.VAL, resultInfo);
5007 }
5008 //where
5009 /** Return the type of a literal with given type tag.
5010 */
5011 Type litType(TypeTag tag) {
5012 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5013 }
5014
5015 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5016 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5017 }
5018
5019 public void visitTypeArray(JCArrayTypeTree tree) {
5020 Type etype = attribType(tree.elemtype, env);
5021 Type type = new ArrayType(etype, syms.arrayClass);
5022 result = check(tree, type, KindSelector.TYP, resultInfo);
5023 }
5024
5025 /** Visitor method for parameterized types.
5026 * Bound checking is left until later, since types are attributed
5027 * before supertype structure is completely known
5028 */
5029 public void visitTypeApply(JCTypeApply tree) {
5030 Type owntype = types.createErrorType(tree.type);
5031
5032 // Attribute functor part of application and make sure it's a class.
5033 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5034
5035 // Attribute type parameters
5036 List<Type> actuals = attribTypes(tree.arguments, env);
5037
5038 if (clazztype.hasTag(CLASS)) {
5039 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5040 if (actuals.isEmpty()) //diamond
5041 actuals = formals;
5042
5043 if (actuals.length() == formals.length()) {
5044 List<Type> a = actuals;
5045 List<Type> f = formals;
5046 while (a.nonEmpty()) {
5047 a.head = a.head.withTypeVar(f.head);
5048 a = a.tail;
5049 f = f.tail;
5050 }
5051 // Compute the proper generic outer
5052 Type clazzOuter = clazztype.getEnclosingType();
5053 if (clazzOuter.hasTag(CLASS)) {
5054 Type site;
5055 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5056 if (clazz.hasTag(IDENT)) {
5057 site = env.enclClass.sym.type;
5058 } else if (clazz.hasTag(SELECT)) {
5059 site = ((JCFieldAccess) clazz).selected.type;
5060 } else throw new AssertionError(""+tree);
5061 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5062 if (site.hasTag(CLASS))
5063 site = types.asOuterSuper(site, clazzOuter.tsym);
5064 if (site == null)
5065 site = types.erasure(clazzOuter);
5066 clazzOuter = site;
5067 }
5068 }
5069 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5070 clazztype.getMetadata(), clazztype.getFlavor());
5071 } else {
5072 if (formals.length() != 0) {
5073 log.error(tree.pos(),
5074 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5075 } else {
5076 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5077 }
5078 owntype = types.createErrorType(tree.type);
5079 }
5080 }
5081 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5082 }
5083
5084 public void visitTypeUnion(JCTypeUnion tree) {
5085 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5086 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5087 for (JCExpression typeTree : tree.alternatives) {
5088 Type ctype = attribType(typeTree, env);
5089 ctype = chk.checkType(typeTree.pos(),
5090 chk.checkClassType(typeTree.pos(), ctype),
5091 syms.throwableType);
5092 if (!ctype.isErroneous()) {
5093 //check that alternatives of a union type are pairwise
5094 //unrelated w.r.t. subtyping
5095 if (chk.intersects(ctype, multicatchTypes.toList())) {
5096 for (Type t : multicatchTypes) {
5097 boolean sub = types.isSubtype(ctype, t);
5098 boolean sup = types.isSubtype(t, ctype);
5099 if (sub || sup) {
5100 //assume 'a' <: 'b'
5101 Type a = sub ? ctype : t;
5102 Type b = sub ? t : ctype;
5103 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5104 }
5105 }
5106 }
5107 multicatchTypes.append(ctype);
5108 if (all_multicatchTypes != null)
5109 all_multicatchTypes.append(ctype);
5110 } else {
5111 if (all_multicatchTypes == null) {
5112 all_multicatchTypes = new ListBuffer<>();
5113 all_multicatchTypes.appendList(multicatchTypes);
5114 }
5115 all_multicatchTypes.append(ctype);
5116 }
5117 }
5118 Type t = check(tree, types.lub(multicatchTypes.toList()),
5119 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5120 if (t.hasTag(CLASS)) {
5121 List<Type> alternatives =
5122 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5123 t = new UnionClassType((ClassType) t, alternatives);
5124 }
5125 tree.type = result = t;
5126 }
5127
5128 public void visitTypeIntersection(JCTypeIntersection tree) {
5129 attribTypes(tree.bounds, env);
5130 tree.type = result = checkIntersection(tree, tree.bounds);
5131 }
5132
5133 public void visitTypeParameter(JCTypeParameter tree) {
5134 TypeVar typeVar = (TypeVar) tree.type;
5135
5136 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5137 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5138 }
5139
5140 if (!typeVar.getUpperBound().isErroneous()) {
5141 //fixup type-parameter bound computed in 'attribTypeVariables'
5142 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5143 }
5144 }
5145
5146 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5147 Set<Type> boundSet = new HashSet<>();
5148 if (bounds.nonEmpty()) {
5149 // accept class or interface or typevar as first bound.
5150 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5151 boundSet.add(types.erasure(bounds.head.type));
5152 if (bounds.head.type.isErroneous()) {
5153 return bounds.head.type;
5154 }
5155 else if (bounds.head.type.hasTag(TYPEVAR)) {
5156 // if first bound was a typevar, do not accept further bounds.
5157 if (bounds.tail.nonEmpty()) {
5158 log.error(bounds.tail.head.pos(),
5159 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5160 return bounds.head.type;
5161 }
5162 } else {
5163 // if first bound was a class or interface, accept only interfaces
5164 // as further bounds.
5165 for (JCExpression bound : bounds.tail) {
5166 bound.type = checkBase(bound.type, bound, env, false, true, false);
5167 if (bound.type.isErroneous()) {
5168 bounds = List.of(bound);
5169 }
5170 else if (bound.type.hasTag(CLASS)) {
5171 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5172 }
5173 }
5174 }
5175 }
5176
5177 if (bounds.length() == 0) {
5178 return syms.objectType;
5179 } else if (bounds.length() == 1) {
5180 return bounds.head.type;
5181 } else {
5182 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5183 // ... the variable's bound is a class type flagged COMPOUND
5184 // (see comment for TypeVar.bound).
5185 // In this case, generate a class tree that represents the
5186 // bound class, ...
5187 JCExpression extending;
5188 List<JCExpression> implementing;
5189 if (!bounds.head.type.isInterface()) {
5190 extending = bounds.head;
5191 implementing = bounds.tail;
5192 } else {
5193 extending = null;
5194 implementing = bounds;
5195 }
5196 JCClassDecl cd = make.at(tree).ClassDef(
5197 make.Modifiers(PUBLIC | ABSTRACT | (extending != null && TreeInfo.symbol(extending).isPrimitiveClass() ? PRIMITIVE_CLASS : 0)),
5198 names.empty, List.nil(),
5199 extending, implementing, List.nil());
5200
5201 ClassSymbol c = (ClassSymbol)owntype.tsym;
5202 Assert.check((c.flags() & COMPOUND) != 0);
5203 cd.sym = c;
5204 c.sourcefile = env.toplevel.sourcefile;
5205
5206 // ... and attribute the bound class
5207 c.flags_field |= UNATTRIBUTED;
5208 Env<AttrContext> cenv = enter.classEnv(cd, env);
5209 typeEnvs.put(c, cenv);
5210 attribClass(c);
5211 return owntype;
5212 }
5213 }
5214
5215 public void visitWildcard(JCWildcard tree) {
5216 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5217 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5218 ? syms.objectType
5219 : attribType(tree.inner, env);
5220 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type, false),
5221 tree.kind.kind,
5222 syms.boundClass),
5223 KindSelector.TYP, resultInfo);
5224 }
5225
5226 public void visitAnnotation(JCAnnotation tree) {
5227 Assert.error("should be handled in annotate");
5228 }
5229
5230 @Override
5231 public void visitModifiers(JCModifiers tree) {
5232 //error recovery only:
5233 Assert.check(resultInfo.pkind == KindSelector.ERR);
5234
5235 attribAnnotationTypes(tree.annotations, env);
5236 }
5237
5238 public void visitAnnotatedType(JCAnnotatedType tree) {
5239 attribAnnotationTypes(tree.annotations, env);
5240 Type underlyingType = attribType(tree.underlyingType, env);
5241 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5242
5243 if (!env.info.isNewClass)
5244 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5245 result = tree.type = annotatedType;
5246 }
5247
5248 public void visitErroneous(JCErroneous tree) {
5249 if (tree.errs != null) {
5250 Env<AttrContext> errEnv = env.dup(env.tree);
5251 errEnv.info.returnResult = unknownExprInfo;
5252 for (JCTree err : tree.errs)
5253 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5254 }
5255 result = tree.type = syms.errType;
5256 }
5257
5258 /** Default visitor method for all other trees.
5259 */
5260 public void visitTree(JCTree tree) {
5261 throw new AssertionError();
5262 }
5263
5264 /**
5265 * Attribute an env for either a top level tree or class or module declaration.
5266 */
5267 public void attrib(Env<AttrContext> env) {
5268 switch (env.tree.getTag()) {
5269 case MODULEDEF:
5270 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5271 break;
5272 case TOPLEVEL:
5273 attribTopLevel(env);
5274 break;
5275 case PACKAGEDEF:
5276 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5277 break;
5278 default:
5279 attribClass(env.tree.pos(), env.enclClass.sym);
5280 }
5281 }
5282
5283 /**
5284 * Attribute a top level tree. These trees are encountered when the
5285 * package declaration has annotations.
5286 */
5287 public void attribTopLevel(Env<AttrContext> env) {
5288 JCCompilationUnit toplevel = env.toplevel;
5289 try {
5290 annotate.flush();
5291 } catch (CompletionFailure ex) {
5292 chk.completionError(toplevel.pos(), ex);
5293 }
5294 }
5295
5296 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5297 try {
5298 annotate.flush();
5299 attribPackage(p);
5300 } catch (CompletionFailure ex) {
5301 chk.completionError(pos, ex);
5302 }
5303 }
5304
5305 void attribPackage(PackageSymbol p) {
5306 attribWithLint(p,
5307 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5308 }
5309
5310 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5311 try {
5312 annotate.flush();
5313 attribModule(m);
5314 } catch (CompletionFailure ex) {
5315 chk.completionError(pos, ex);
5316 }
5317 }
5318
5319 void attribModule(ModuleSymbol m) {
5320 attribWithLint(m, env -> attribStat(env.tree, env));
5321 }
5322
5323 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5324 Env<AttrContext> env = typeEnvs.get(sym);
5325
5326 Env<AttrContext> lintEnv = env;
5327 while (lintEnv.info.lint == null)
5328 lintEnv = lintEnv.next;
5329
5330 Lint lint = lintEnv.info.lint.augment(sym);
5331
5332 Lint prevLint = chk.setLint(lint);
5333 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5334
5335 try {
5336 deferredLintHandler.flush(env.tree.pos());
5337 attrib.accept(env);
5338 } finally {
5339 log.useSource(prev);
5340 chk.setLint(prevLint);
5341 }
5342 }
5343
5344 /** Main method: attribute class definition associated with given class symbol.
5345 * reporting completion failures at the given position.
5346 * @param pos The source position at which completion errors are to be
5347 * reported.
5348 * @param c The class symbol whose definition will be attributed.
5349 */
5350 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5351 try {
5352 annotate.flush();
5353 attribClass(c);
5354 if (c.type.isPrimitiveClass()) {
5355 final Env<AttrContext> env = typeEnvs.get(c);
5356 if (env != null && env.tree != null && env.tree.hasTag(CLASSDEF))
5357 chk.checkNonCyclicMembership((JCClassDecl)env.tree);
5358 }
5359 } catch (CompletionFailure ex) {
5360 chk.completionError(pos, ex);
5361 }
5362 }
5363
5364 /** Attribute class definition associated with given class symbol.
5365 * @param c The class symbol whose definition will be attributed.
5366 */
5367 void attribClass(ClassSymbol c) throws CompletionFailure {
5368 if (c.type.hasTag(ERROR)) return;
5369
5370 // Check for cycles in the inheritance graph, which can arise from
5371 // ill-formed class files.
5372 chk.checkNonCyclic(null, c.type);
5373
5374 Type st = types.supertype(c.type);
5375 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5376 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5377 // First, attribute superclass.
5378 if (st.hasTag(CLASS))
5379 attribClass((ClassSymbol)st.tsym);
5380
5381 // Next attribute owner, if it is a class.
5382 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5383 attribClass((ClassSymbol)c.owner);
5384
5385 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5386 }
5387
5388 // The previous operations might have attributed the current class
5389 // if there was a cycle. So we test first whether the class is still
5390 // UNATTRIBUTED.
5391 if ((c.flags_field & UNATTRIBUTED) != 0) {
5392 c.flags_field &= ~UNATTRIBUTED;
5393
5394 // Get environment current at the point of class definition.
5395 Env<AttrContext> env = typeEnvs.get(c);
5396
5397 if (c.isSealed() &&
5398 !c.isEnum() &&
5399 !c.isPermittedExplicit &&
5400 c.permitted.isEmpty()) {
5401 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5402 }
5403
5404 if (c.isSealed()) {
5405 Set<Symbol> permittedTypes = new HashSet<>();
5406 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5407 for (Symbol subTypeSym : c.permitted) {
5408 boolean isTypeVar = false;
5409 if (subTypeSym.type.getTag() == TYPEVAR) {
5410 isTypeVar = true; //error recovery
5411 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5412 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5413 }
5414 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5415 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5416 }
5417 if (permittedTypes.contains(subTypeSym)) {
5418 DiagnosticPosition pos =
5419 env.enclClass.permitting.stream()
5420 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5421 .limit(2).collect(List.collector()).get(1);
5422 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5423 } else {
5424 permittedTypes.add(subTypeSym);
5425 }
5426 if (sealedInUnnamed) {
5427 if (subTypeSym.packge() != c.packge()) {
5428 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5429 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5430 );
5431 }
5432 } else if (subTypeSym.packge().modle != c.packge().modle) {
5433 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5434 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5435 );
5436 }
5437 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5438 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5439 Errors.InvalidPermitsClause(
5440 subTypeSym == c.type.tsym ?
5441 Fragments.MustNotBeSameClass :
5442 Fragments.MustNotBeSupertype(subTypeSym.type)
5443 )
5444 );
5445 } else if (!isTypeVar) {
5446 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5447 .stream()
5448 .anyMatch(d -> d.tsym == c);
5449 if (!thisIsASuper) {
5450 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5451 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5452 }
5453 }
5454 }
5455 }
5456
5457 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5458 .stream()
5459 .filter(s -> s.tsym.isSealed())
5460 .map(s -> (ClassSymbol) s.tsym)
5461 .collect(List.collector());
5462
5463 if (sealedSupers.isEmpty()) {
5464 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5465 boolean hasErrorSuper = false;
5466
5467 hasErrorSuper |= types.directSupertypes(c.type)
5468 .stream()
5469 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5470
5471 ClassType ct = (ClassType) c.type;
5472
5473 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5474
5475 if (!hasErrorSuper) {
5476 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5477 }
5478 }
5479 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5480 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5481 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5482 }
5483
5484 if (!c.type.isCompound()) {
5485 for (ClassSymbol supertypeSym : sealedSupers) {
5486 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5487 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5488 }
5489 }
5490 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5491 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5492 c.isInterface() ?
5493 Errors.NonSealedOrSealedExpected :
5494 Errors.NonSealedSealedOrFinalExpected);
5495 }
5496 }
5497 }
5498
5499 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5500 // because the annotations were not available at the time the env was created. Therefore,
5501 // we look up the environment chain for the first enclosing environment for which the
5502 // lint value is set. Typically, this is the parent env, but might be further if there
5503 // are any envs created as a result of TypeParameter nodes.
5504 Env<AttrContext> lintEnv = env;
5505 while (lintEnv.info.lint == null)
5506 lintEnv = lintEnv.next;
5507
5508 // Having found the enclosing lint value, we can initialize the lint value for this class
5509 env.info.lint = lintEnv.info.lint.augment(c);
5510
5511 Lint prevLint = chk.setLint(env.info.lint);
5512 JavaFileObject prev = log.useSource(c.sourcefile);
5513 ResultInfo prevReturnRes = env.info.returnResult;
5514
5515 try {
5516 deferredLintHandler.flush(env.tree);
5517 env.info.returnResult = null;
5518 // java.lang.Enum may not be subclassed by a non-enum
5519 if (st.tsym == syms.enumSym &&
5520 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5521 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5522
5523 // Enums may not be extended by source-level classes
5524 if (st.tsym != null &&
5525 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5526 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5527 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5528 }
5529
5530 if (rs.isSerializable(c.type)) {
5531 env.info.isSerializable = true;
5532 }
5533
5534 if ((c.flags() & (VALUE_CLASS | ABSTRACT)) == VALUE_CLASS) { // for non-intersection, concrete primitive/value classes.
5535 Assert.check(env.tree.hasTag(CLASSDEF));
5536 JCClassDecl classDecl = (JCClassDecl) env.tree;
5537 if (classDecl.extending != null) {
5538 chk.checkSuperConstraintsOfValueClass(env.tree.pos(), c);
5539 }
5540 }
5541
5542 attribClassBody(env, c);
5543
5544 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5545 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5546 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5547 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5548 } finally {
5549 env.info.returnResult = prevReturnRes;
5550 log.useSource(prev);
5551 chk.setLint(prevLint);
5552 }
5553
5554 }
5555 }
5556
5557 public void visitImport(JCImport tree) {
5558 // nothing to do
5559 }
5560
5561 public void visitModuleDef(JCModuleDecl tree) {
5562 tree.sym.completeUsesProvides();
5563 ModuleSymbol msym = tree.sym;
5564 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5565 Lint prevLint = chk.setLint(lint);
5566 chk.checkModuleName(tree);
5567 chk.checkDeprecatedAnnotation(tree, msym);
5568
5569 try {
5570 deferredLintHandler.flush(tree.pos());
5571 } finally {
5572 chk.setLint(prevLint);
5573 }
5574 }
5575
5576 /** Finish the attribution of a class. */
5577 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5578 JCClassDecl tree = (JCClassDecl)env.tree;
5579 Assert.check(c == tree.sym);
5580
5581 // Validate type parameters, supertype and interfaces.
5582 attribStats(tree.typarams, env);
5583 if (!c.isAnonymous()) {
5584 //already checked if anonymous
5585 chk.validate(tree.typarams, env);
5586 chk.validate(tree.extending, env);
5587 chk.validate(tree.implementing, env);
5588 }
5589
5590 c.markAbstractIfNeeded(types);
5591
5592 // If this is a non-abstract class, check that it has no abstract
5593 // methods or unimplemented methods of an implemented interface.
5594 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5595 chk.checkAllDefined(tree.pos(), c);
5596 }
5597
5598 if ((c.flags() & ANNOTATION) != 0) {
5599 if (tree.implementing.nonEmpty())
5600 log.error(tree.implementing.head.pos(),
5601 Errors.CantExtendIntfAnnotation);
5602 if (tree.typarams.nonEmpty()) {
5603 log.error(tree.typarams.head.pos(),
5604 Errors.IntfAnnotationCantHaveTypeParams(c));
5605 }
5606
5607 // If this annotation type has a @Repeatable, validate
5608 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5609 // If this annotation type has a @Repeatable, validate
5610 if (repeatable != null) {
5611 // get diagnostic position for error reporting
5612 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5613 Assert.checkNonNull(cbPos);
5614
5615 chk.validateRepeatable(c, repeatable, cbPos);
5616 }
5617 } else {
5618 // Check that all extended classes and interfaces
5619 // are compatible (i.e. no two define methods with same arguments
5620 // yet different return types). (JLS 8.4.8.3)
5621 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5622 if (allowDefaultMethods) {
5623 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5624 }
5625 }
5626
5627 // Check that class does not import the same parameterized interface
5628 // with two different argument lists.
5629 chk.checkClassBounds(tree.pos(), c.type);
5630
5631 tree.type = c.type;
5632
5633 for (List<JCTypeParameter> l = tree.typarams;
5634 l.nonEmpty(); l = l.tail) {
5635 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5636 }
5637
5638 // Check that a generic class doesn't extend Throwable
5639 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5640 log.error(tree.extending.pos(), Errors.GenericThrowable);
5641
5642 // Check that all methods which implement some
5643 // method conform to the method they implement.
5644 chk.checkImplementations(tree);
5645
5646 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5647 checkAutoCloseable(tree.pos(), env, c.type);
5648
5649 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5650 // Attribute declaration
5651 attribStat(l.head, env);
5652 // Check that declarations in inner classes are not static (JLS 8.1.2)
5653 // Make an exception for static constants.
5654 if (!allowRecords &&
5655 c.owner.kind != PCK &&
5656 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5657 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5658 VarSymbol sym = null;
5659 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5660 if (sym == null ||
5661 sym.kind != VAR ||
5662 sym.getConstValue() == null)
5663 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5664 }
5665 }
5666
5667 // Check for cycles among non-initial constructors.
5668 chk.checkCyclicConstructors(tree);
5669
5670 // Check for cycles among annotation elements.
5671 chk.checkNonCyclicElements(tree);
5672
5673 // Check for proper use of serialVersionUID and other
5674 // serialization-related fields and methods
5675 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5676 && rs.isSerializable(c.type)
5677 && !c.isAnonymous()) {
5678 chk.checkSerialStructure(tree, c);
5679 }
5680 if (allowTypeAnnos) {
5681 // Correctly organize the positions of the type annotations
5682 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5683
5684 // Check type annotations applicability rules
5685 validateTypeAnnotations(tree, false);
5686 }
5687 }
5688 // where
5689 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5690 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5691 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5692 if (types.isSameType(al.head.annotationType.type, t))
5693 return al.head.pos();
5694 }
5695
5696 return null;
5697 }
5698
5699 private Type capture(Type type) {
5700 return types.capture(type);
5701 }
5702
5703 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5704 if (type.isErroneous()) {
5705 tree.vartype = make.at(Position.NOPOS).Erroneous();
5706 } else {
5707 tree.vartype = make.at(Position.NOPOS).Type(type);
5708 }
5709 }
5710
5711 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5712 tree.accept(new TypeAnnotationsValidator(sigOnly));
5713 }
5714 //where
5715 private final class TypeAnnotationsValidator extends TreeScanner {
5716
5717 private final boolean sigOnly;
5718 public TypeAnnotationsValidator(boolean sigOnly) {
5719 this.sigOnly = sigOnly;
5720 }
5721
5722 public void visitAnnotation(JCAnnotation tree) {
5723 chk.validateTypeAnnotation(tree, false);
5724 super.visitAnnotation(tree);
5725 }
5726 public void visitAnnotatedType(JCAnnotatedType tree) {
5727 if (!tree.underlyingType.type.isErroneous()) {
5728 super.visitAnnotatedType(tree);
5729 }
5730 }
5731 public void visitTypeParameter(JCTypeParameter tree) {
5732 chk.validateTypeAnnotations(tree.annotations, true);
5733 scan(tree.bounds);
5734 // Don't call super.
5735 // This is needed because above we call validateTypeAnnotation with
5736 // false, which would forbid annotations on type parameters.
5737 // super.visitTypeParameter(tree);
5738 }
5739 public void visitMethodDef(JCMethodDecl tree) {
5740 if (tree.recvparam != null &&
5741 !tree.recvparam.vartype.type.isErroneous()) {
5742 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5743 }
5744 if (tree.restype != null && tree.restype.type != null) {
5745 validateAnnotatedType(tree.restype, tree.restype.type);
5746 }
5747 if (sigOnly) {
5748 scan(tree.mods);
5749 scan(tree.restype);
5750 scan(tree.typarams);
5751 scan(tree.recvparam);
5752 scan(tree.params);
5753 scan(tree.thrown);
5754 } else {
5755 scan(tree.defaultValue);
5756 scan(tree.body);
5757 }
5758 }
5759 public void visitVarDef(final JCVariableDecl tree) {
5760 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5761 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5762 validateAnnotatedType(tree.vartype, tree.sym.type);
5763 scan(tree.mods);
5764 scan(tree.vartype);
5765 if (!sigOnly) {
5766 scan(tree.init);
5767 }
5768 }
5769 public void visitTypeCast(JCTypeCast tree) {
5770 if (tree.clazz != null && tree.clazz.type != null)
5771 validateAnnotatedType(tree.clazz, tree.clazz.type);
5772 super.visitTypeCast(tree);
5773 }
5774 public void visitTypeTest(JCInstanceOf tree) {
5775 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5776 validateAnnotatedType(tree.pattern, tree.pattern.type);
5777 super.visitTypeTest(tree);
5778 }
5779 public void visitNewClass(JCNewClass tree) {
5780 if (tree.clazz != null && tree.clazz.type != null) {
5781 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5782 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5783 tree.clazz.type.tsym);
5784 }
5785 if (tree.def != null) {
5786 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5787 }
5788
5789 validateAnnotatedType(tree.clazz, tree.clazz.type);
5790 }
5791 super.visitNewClass(tree);
5792 }
5793 public void visitNewArray(JCNewArray tree) {
5794 if (tree.elemtype != null && tree.elemtype.type != null) {
5795 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5796 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5797 tree.elemtype.type.tsym);
5798 }
5799 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5800 }
5801 super.visitNewArray(tree);
5802 }
5803 public void visitClassDef(JCClassDecl tree) {
5804 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5805 if (sigOnly) {
5806 scan(tree.mods);
5807 scan(tree.typarams);
5808 scan(tree.extending);
5809 scan(tree.implementing);
5810 }
5811 for (JCTree member : tree.defs) {
5812 if (member.hasTag(Tag.CLASSDEF)) {
5813 continue;
5814 }
5815 scan(member);
5816 }
5817 }
5818 public void visitBlock(JCBlock tree) {
5819 if (!sigOnly) {
5820 scan(tree.stats);
5821 }
5822 }
5823
5824 /* I would want to model this after
5825 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5826 * and override visitSelect and visitTypeApply.
5827 * However, we only set the annotated type in the top-level type
5828 * of the symbol.
5829 * Therefore, we need to override each individual location where a type
5830 * can occur.
5831 */
5832 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5833 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5834
5835 if (type.isPrimitiveOrVoid()) {
5836 return;
5837 }
5838
5839 JCTree enclTr = errtree;
5840 Type enclTy = type;
5841
5842 boolean repeat = true;
5843 while (repeat) {
5844 if (enclTr.hasTag(TYPEAPPLY)) {
5845 List<Type> tyargs = enclTy.getTypeArguments();
5846 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5847 if (trargs.length() > 0) {
5848 // Nothing to do for diamonds
5849 if (tyargs.length() == trargs.length()) {
5850 for (int i = 0; i < tyargs.length(); ++i) {
5851 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5852 }
5853 }
5854 // If the lengths don't match, it's either a diamond
5855 // or some nested type that redundantly provides
5856 // type arguments in the tree.
5857 }
5858
5859 // Look at the clazz part of a generic type
5860 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5861 }
5862
5863 if (enclTr.hasTag(SELECT)) {
5864 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5865 if (enclTy != null &&
5866 !enclTy.hasTag(NONE)) {
5867 enclTy = enclTy.getEnclosingType();
5868 }
5869 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5870 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5871 if (enclTy == null || enclTy.hasTag(NONE)) {
5872 if (at.getAnnotations().size() == 1) {
5873 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5874 } else {
5875 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5876 for (JCAnnotation an : at.getAnnotations()) {
5877 comps.add(an.attribute);
5878 }
5879 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5880 }
5881 repeat = false;
5882 }
5883 enclTr = at.underlyingType;
5884 // enclTy doesn't need to be changed
5885 } else if (enclTr.hasTag(IDENT)) {
5886 repeat = false;
5887 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5888 JCWildcard wc = (JCWildcard) enclTr;
5889 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5890 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5891 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5892 } else {
5893 // Nothing to do for UNBOUND
5894 }
5895 repeat = false;
5896 } else if (enclTr.hasTag(TYPEARRAY)) {
5897 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5898 validateAnnotatedType(art.getType(), art.elemtype.type);
5899 repeat = false;
5900 } else if (enclTr.hasTag(TYPEUNION)) {
5901 JCTypeUnion ut = (JCTypeUnion) enclTr;
5902 for (JCTree t : ut.getTypeAlternatives()) {
5903 validateAnnotatedType(t, t.type);
5904 }
5905 repeat = false;
5906 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5907 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5908 for (JCTree t : it.getBounds()) {
5909 validateAnnotatedType(t, t.type);
5910 }
5911 repeat = false;
5912 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5913 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5914 repeat = false;
5915 } else {
5916 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5917 " within: "+ errtree + " with kind: " + errtree.getKind());
5918 }
5919 }
5920 }
5921
5922 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5923 Symbol sym) {
5924 // Ensure that no declaration annotations are present.
5925 // Note that a tree type might be an AnnotatedType with
5926 // empty annotations, if only declaration annotations were given.
5927 // This method will raise an error for such a type.
5928 for (JCAnnotation ai : annotations) {
5929 if (!ai.type.isErroneous() &&
5930 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5931 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5932 }
5933 }
5934 }
5935 }
5936
5937 // <editor-fold desc="post-attribution visitor">
5938
5939 /**
5940 * Handle missing types/symbols in an AST. This routine is useful when
5941 * the compiler has encountered some errors (which might have ended up
5942 * terminating attribution abruptly); if the compiler is used in fail-over
5943 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5944 * prevents NPE to be propagated during subsequent compilation steps.
5945 */
5946 public void postAttr(JCTree tree) {
5947 new PostAttrAnalyzer().scan(tree);
5948 }
5949
5950 class PostAttrAnalyzer extends TreeScanner {
5951
5952 private void initTypeIfNeeded(JCTree that) {
5953 if (that.type == null) {
5954 if (that.hasTag(METHODDEF)) {
5955 that.type = dummyMethodType((JCMethodDecl)that);
5956 } else {
5957 that.type = syms.unknownType;
5958 }
5959 }
5960 }
5961
5962 /* Construct a dummy method type. If we have a method declaration,
5963 * and the declared return type is void, then use that return type
5964 * instead of UNKNOWN to avoid spurious error messages in lambda
5965 * bodies (see:JDK-8041704).
5966 */
5967 private Type dummyMethodType(JCMethodDecl md) {
5968 Type restype = syms.unknownType;
5969 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5970 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5971 if (prim.typetag == VOID)
5972 restype = syms.voidType;
5973 }
5974 return new MethodType(List.nil(), restype,
5975 List.nil(), syms.methodClass);
5976 }
5977 private Type dummyMethodType() {
5978 return dummyMethodType(null);
5979 }
5980
5981 @Override
5982 public void scan(JCTree tree) {
5983 if (tree == null) return;
5984 if (tree instanceof JCExpression) {
5985 initTypeIfNeeded(tree);
5986 }
5987 super.scan(tree);
5988 }
5989
5990 @Override
5991 public void visitIdent(JCIdent that) {
5992 if (that.sym == null) {
5993 that.sym = syms.unknownSymbol;
5994 }
5995 }
5996
5997 @Override
5998 public void visitSelect(JCFieldAccess that) {
5999 if (that.sym == null) {
6000 that.sym = syms.unknownSymbol;
6001 }
6002 super.visitSelect(that);
6003 }
6004
6005 @Override
6006 public void visitClassDef(JCClassDecl that) {
6007 initTypeIfNeeded(that);
6008 if (that.sym == null) {
6009 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6010 }
6011 super.visitClassDef(that);
6012 }
6013
6014 @Override
6015 public void visitMethodDef(JCMethodDecl that) {
6016 initTypeIfNeeded(that);
6017 if (that.sym == null) {
6018 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6019 }
6020 super.visitMethodDef(that);
6021 }
6022
6023 @Override
6024 public void visitVarDef(JCVariableDecl that) {
6025 initTypeIfNeeded(that);
6026 if (that.sym == null) {
6027 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6028 that.sym.adr = 0;
6029 }
6030 if (that.vartype == null) {
6031 that.vartype = make.at(Position.NOPOS).Erroneous();
6032 }
6033 super.visitVarDef(that);
6034 }
6035
6036 @Override
6037 public void visitBindingPattern(JCBindingPattern that) {
6038 initTypeIfNeeded(that);
6039 initTypeIfNeeded(that.var);
6040 if (that.var.sym == null) {
6041 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6042 that.var.sym.adr = 0;
6043 }
6044 super.visitBindingPattern(that);
6045 }
6046
6047 @Override
6048 public void visitNewClass(JCNewClass that) {
6049 if (that.constructor == null) {
6050 that.constructor = new MethodSymbol(0, names.init,
6051 dummyMethodType(), syms.noSymbol);
6052 }
6053 if (that.constructorType == null) {
6054 that.constructorType = syms.unknownType;
6055 }
6056 super.visitNewClass(that);
6057 }
6058
6059 @Override
6060 public void visitAssignop(JCAssignOp that) {
6061 if (that.operator == null) {
6062 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6063 -1, syms.noSymbol);
6064 }
6065 super.visitAssignop(that);
6066 }
6067
6068 @Override
6069 public void visitBinary(JCBinary that) {
6070 if (that.operator == null) {
6071 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6072 -1, syms.noSymbol);
6073 }
6074 super.visitBinary(that);
6075 }
6076
6077 @Override
6078 public void visitUnary(JCUnary that) {
6079 if (that.operator == null) {
6080 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6081 -1, syms.noSymbol);
6082 }
6083 super.visitUnary(that);
6084 }
6085
6086 @Override
6087 public void visitReference(JCMemberReference that) {
6088 super.visitReference(that);
6089 if (that.sym == null) {
6090 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6091 syms.noSymbol);
6092 }
6093 }
6094 }
6095 // </editor-fold>
6096
6097 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6098 new TreeScanner() {
6099 Symbol packge = pkg;
6100 @Override
6101 public void visitIdent(JCIdent that) {
6102 that.sym = packge;
6103 }
6104
6105 @Override
6106 public void visitSelect(JCFieldAccess that) {
6107 that.sym = packge;
6108 packge = packge.owner;
6109 super.visitSelect(that);
6110 }
6111 }.scan(pid);
6112 }
6113
6114 }