1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
62 import com.sun.tools.javac.tree.*;
63 import com.sun.tools.javac.tree.JCTree.*;
64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
65 import com.sun.tools.javac.util.*;
66 import com.sun.tools.javac.util.DefinedBy.Api;
67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
68 import com.sun.tools.javac.util.JCDiagnostic.Error;
69 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
70 import com.sun.tools.javac.util.JCDiagnostic.Warning;
71 import com.sun.tools.javac.util.List;
72
73 import static com.sun.tools.javac.code.Flags.*;
74 import static com.sun.tools.javac.code.Flags.ANNOTATION;
75 import static com.sun.tools.javac.code.Flags.BLOCK;
76 import static com.sun.tools.javac.code.Kinds.*;
77 import static com.sun.tools.javac.code.Kinds.Kind.*;
78 import static com.sun.tools.javac.code.TypeTag.*;
79 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
80 import static com.sun.tools.javac.tree.JCTree.Tag.*;
81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
82
83 /** This is the main context-dependent analysis phase in GJC. It
84 * encompasses name resolution, type checking and constant folding as
85 * subtasks. Some subtasks involve auxiliary classes.
86 * @see Check
87 * @see Resolve
88 * @see ConstFold
89 * @see Infer
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public class Attr extends JCTree.Visitor {
97 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
98
99 final Names names;
100 final Log log;
101 final Symtab syms;
102 final Resolve rs;
103 final Operators operators;
104 final Infer infer;
105 final Analyzer analyzer;
106 final DeferredAttr deferredAttr;
107 final Check chk;
108 final Flow flow;
109 final MemberEnter memberEnter;
110 final TypeEnter typeEnter;
111 final TreeMaker make;
112 final ConstFold cfolder;
113 final Enter enter;
114 final Target target;
115 final Types types;
116 final Preview preview;
117 final JCDiagnostic.Factory diags;
118 final TypeAnnotations typeAnnotations;
119 final DeferredLintHandler deferredLintHandler;
120 final TypeEnvs typeEnvs;
121 final Dependencies dependencies;
122 final Annotate annotate;
123 final ArgumentAttr argumentAttr;
124 final MatchBindingsComputer matchBindingsComputer;
125 final AttrRecover attrRecover;
126
127 public static Attr instance(Context context) {
128 Attr instance = context.get(attrKey);
129 if (instance == null)
130 instance = new Attr(context);
131 return instance;
132 }
133
134 @SuppressWarnings("this-escape")
135 protected Attr(Context context) {
136 context.put(attrKey, this);
137
138 names = Names.instance(context);
139 log = Log.instance(context);
140 syms = Symtab.instance(context);
141 rs = Resolve.instance(context);
142 operators = Operators.instance(context);
143 chk = Check.instance(context);
144 flow = Flow.instance(context);
145 memberEnter = MemberEnter.instance(context);
146 typeEnter = TypeEnter.instance(context);
147 make = TreeMaker.instance(context);
148 enter = Enter.instance(context);
149 infer = Infer.instance(context);
150 analyzer = Analyzer.instance(context);
151 deferredAttr = DeferredAttr.instance(context);
152 cfolder = ConstFold.instance(context);
153 target = Target.instance(context);
154 types = Types.instance(context);
155 preview = Preview.instance(context);
156 diags = JCDiagnostic.Factory.instance(context);
157 annotate = Annotate.instance(context);
158 typeAnnotations = TypeAnnotations.instance(context);
159 deferredLintHandler = DeferredLintHandler.instance(context);
160 typeEnvs = TypeEnvs.instance(context);
161 dependencies = Dependencies.instance(context);
162 argumentAttr = ArgumentAttr.instance(context);
163 matchBindingsComputer = MatchBindingsComputer.instance(context);
164 attrRecover = AttrRecover.instance(context);
165
166 Options options = Options.instance(context);
167
168 Source source = Source.instance(context);
169 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
170 allowRecords = Feature.RECORDS.allowedInSource(source);
171 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
172 Feature.PATTERN_SWITCH.allowedInSource(source);
173 allowUnconditionalPatternsInstanceOf =
174 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
175 sourceName = source.name;
176 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
177
178 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
179 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
180 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
181 methodAttrInfo = new MethodAttrInfo();
182 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
183 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
184 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
185 }
186
187 /** Switch: reifiable types in instanceof enabled?
188 */
189 boolean allowReifiableTypesInInstanceof;
190
191 /** Are records allowed
192 */
193 private final boolean allowRecords;
194
195 /** Are patterns in switch allowed
196 */
197 private final boolean allowPatternSwitch;
198
199 /** Are unconditional patterns in instanceof allowed
200 */
201 private final boolean allowUnconditionalPatternsInstanceOf;
202
203 /**
204 * Switch: warn about use of variable before declaration?
205 * RFE: 6425594
206 */
207 boolean useBeforeDeclarationWarning;
208
209 /**
210 * Switch: name of source level; used for error reporting.
211 */
212 String sourceName;
213
214 /** Check kind and type of given tree against protokind and prototype.
215 * If check succeeds, store type in tree and return it.
216 * If check fails, store errType in tree and return it.
217 * No checks are performed if the prototype is a method type.
218 * It is not necessary in this case since we know that kind and type
219 * are correct.
220 *
221 * @param tree The tree whose kind and type is checked
222 * @param found The computed type of the tree
223 * @param ownkind The computed kind of the tree
224 * @param resultInfo The expected result of the tree
225 */
226 Type check(final JCTree tree,
227 final Type found,
228 final KindSelector ownkind,
229 final ResultInfo resultInfo) {
230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
231 Type owntype;
232 boolean shouldCheck = !found.hasTag(ERROR) &&
233 !resultInfo.pt.hasTag(METHOD) &&
234 !resultInfo.pt.hasTag(FORALL);
235 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
236 log.error(tree.pos(),
237 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
238 ownkind.kindNames()));
239 owntype = types.createErrorType(found);
240 } else if (inferenceContext.free(found)) {
241 //delay the check if there are inference variables in the found type
242 //this means we are dealing with a partially inferred poly expression
243 owntype = shouldCheck ? resultInfo.pt : found;
244 if (resultInfo.checkMode.installPostInferenceHook()) {
245 inferenceContext.addFreeTypeListener(List.of(found),
246 instantiatedContext -> {
247 ResultInfo pendingResult =
248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
250 });
251 }
252 } else {
253 owntype = shouldCheck ?
254 resultInfo.check(tree, found) :
255 found;
256 }
257 if (resultInfo.checkMode.updateTreeType()) {
258 tree.type = owntype;
259 }
260 return owntype;
261 }
262
263 /** Is given blank final variable assignable, i.e. in a scope where it
264 * may be assigned to even though it is final?
265 * @param v The blank final variable.
266 * @param env The current environment.
267 */
268 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
269 Symbol owner = env.info.scope.owner;
270 // owner refers to the innermost variable, method or
271 // initializer block declaration at this point.
272 boolean isAssignable =
273 v.owner == owner
274 ||
275 ((owner.name == names.init || // i.e. we are in a constructor
276 owner.kind == VAR || // i.e. we are in a variable initializer
277 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
278 &&
279 v.owner == owner.owner
280 &&
281 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
282 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
283 return isAssignable & !insideCompactConstructor;
284 }
285
286 /** Check that variable can be assigned to.
287 * @param pos The current source code position.
288 * @param v The assigned variable
289 * @param base If the variable is referred to in a Select, the part
290 * to the left of the `.', null otherwise.
291 * @param env The current environment.
292 */
293 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
294 if (v.name == names._this) {
295 log.error(pos, Errors.CantAssignValToThis);
296 } else if ((v.flags() & FINAL) != 0 &&
297 ((v.flags() & HASINIT) != 0
298 ||
299 !((base == null ||
300 TreeInfo.isThisQualifier(base)) &&
301 isAssignableAsBlankFinal(v, env)))) {
302 if (v.isResourceVariable()) { //TWR resource
303 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
304 } else {
305 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
306 }
307 }
308
309 if (!env.info.ctorPrologue &&
310 v.owner.isValueClass() &&
311 !env.info.instanceInitializerBlock && // it is OK instance initializer blocks will go after super() anyways
312 v.owner.kind == TYP &&
313 v.owner == env.enclClass.sym &&
314 (v.flags() & STATIC) == 0 &&
315 (base == null ||
316 TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, base))) {
317 log.error(pos, Errors.CantRefAfterCtorCalled(v));
318 }
319 }
320
321 /** Does tree represent a static reference to an identifier?
322 * It is assumed that tree is either a SELECT or an IDENT.
323 * We have to weed out selects from non-type names here.
324 * @param tree The candidate tree.
325 */
326 boolean isStaticReference(JCTree tree) {
327 if (tree.hasTag(SELECT)) {
328 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
329 if (lsym == null || lsym.kind != TYP) {
330 return false;
331 }
332 }
333 return true;
334 }
335
336 /** Is this symbol a type?
337 */
338 static boolean isType(Symbol sym) {
339 return sym != null && sym.kind == TYP;
340 }
341
342 /** The current `this' symbol.
343 * @param env The current environment.
344 */
345 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
346 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
347 }
348
349 /** Attribute a parsed identifier.
350 * @param tree Parsed identifier name
351 * @param topLevel The toplevel to use
352 */
353 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
354 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
355 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
356 syms.errSymbol.name,
357 null, null, null, null);
358 localEnv.enclClass.sym = syms.errSymbol;
359 return attribIdent(tree, localEnv);
360 }
361
362 /** Attribute a parsed identifier.
363 * @param tree Parsed identifier name
364 * @param env The env to use
365 */
366 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
367 return tree.accept(identAttributer, env);
368 }
369 // where
370 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
371 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
372 @Override @DefinedBy(Api.COMPILER_TREE)
373 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
374 Symbol site = visit(node.getExpression(), env);
375 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
376 return site;
377 Name name = (Name)node.getIdentifier();
378 if (site.kind == PCK) {
379 env.toplevel.packge = (PackageSymbol)site;
380 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
381 KindSelector.TYP_PCK);
382 } else {
383 env.enclClass.sym = (ClassSymbol)site;
384 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
385 }
386 }
387
388 @Override @DefinedBy(Api.COMPILER_TREE)
389 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
390 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
391 }
392 }
393
394 public Type coerce(Type etype, Type ttype) {
395 return cfolder.coerce(etype, ttype);
396 }
397
398 public Type attribType(JCTree node, TypeSymbol sym) {
399 Env<AttrContext> env = typeEnvs.get(sym);
400 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
401 return attribTree(node, localEnv, unknownTypeInfo);
402 }
403
404 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
405 // Attribute qualifying package or class.
406 JCFieldAccess s = tree.qualid;
407 return attribTree(s.selected, env,
408 new ResultInfo(tree.staticImport ?
409 KindSelector.TYP : KindSelector.TYP_PCK,
410 Type.noType));
411 }
412
413 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
414 return attribToTree(expr, env, tree, unknownExprInfo);
415 }
416
417 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
418 return attribToTree(stmt, env, tree, statInfo);
419 }
420
421 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
422 breakTree = tree;
423 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
424 try {
425 deferredAttr.attribSpeculative(root, env, resultInfo,
426 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
427 argumentAttr.withLocalCacheContext());
428 attrRecover.doRecovery();
429 } catch (BreakAttr b) {
430 return b.env;
431 } catch (AssertionError ae) {
432 if (ae.getCause() instanceof BreakAttr breakAttr) {
433 return breakAttr.env;
434 } else {
435 throw ae;
436 }
437 } finally {
438 breakTree = null;
439 log.useSource(prev);
440 }
441 return env;
442 }
443
444 private JCTree breakTree = null;
445
446 private static class BreakAttr extends RuntimeException {
447 static final long serialVersionUID = -6924771130405446405L;
448 private transient Env<AttrContext> env;
449 private BreakAttr(Env<AttrContext> env) {
450 this.env = env;
451 }
452 }
453
454 /**
455 * Mode controlling behavior of Attr.Check
456 */
457 enum CheckMode {
458
459 NORMAL,
460
461 /**
462 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
463 * that the captured var cache in {@code InferenceContext} will be used in read-only
464 * mode when performing inference checks.
465 */
466 NO_TREE_UPDATE {
467 @Override
468 public boolean updateTreeType() {
469 return false;
470 }
471 },
472 /**
473 * Mode signalling that caller will manage free types in tree decorations.
474 */
475 NO_INFERENCE_HOOK {
476 @Override
477 public boolean installPostInferenceHook() {
478 return false;
479 }
480 };
481
482 public boolean updateTreeType() {
483 return true;
484 }
485 public boolean installPostInferenceHook() {
486 return true;
487 }
488 }
489
490
491 class ResultInfo {
492 final KindSelector pkind;
493 final Type pt;
494 final CheckContext checkContext;
495 final CheckMode checkMode;
496
497 ResultInfo(KindSelector pkind, Type pt) {
498 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
499 }
500
501 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
502 this(pkind, pt, chk.basicHandler, checkMode);
503 }
504
505 protected ResultInfo(KindSelector pkind,
506 Type pt, CheckContext checkContext) {
507 this(pkind, pt, checkContext, CheckMode.NORMAL);
508 }
509
510 protected ResultInfo(KindSelector pkind,
511 Type pt, CheckContext checkContext, CheckMode checkMode) {
512 this.pkind = pkind;
513 this.pt = pt;
514 this.checkContext = checkContext;
515 this.checkMode = checkMode;
516 }
517
518 /**
519 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
520 * @param tree The tree to be type-checked.
521 * @return true if {@code ArgumentAttr} should be used.
522 */
523 protected boolean needsArgumentAttr(JCTree tree) { return false; }
524
525 protected Type check(final DiagnosticPosition pos, final Type found) {
526 return chk.checkType(pos, found, pt, checkContext);
527 }
528
529 protected ResultInfo dup(Type newPt) {
530 return new ResultInfo(pkind, newPt, checkContext, checkMode);
531 }
532
533 protected ResultInfo dup(CheckContext newContext) {
534 return new ResultInfo(pkind, pt, newContext, checkMode);
535 }
536
537 protected ResultInfo dup(Type newPt, CheckContext newContext) {
538 return new ResultInfo(pkind, newPt, newContext, checkMode);
539 }
540
541 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
542 return new ResultInfo(pkind, newPt, newContext, newMode);
543 }
544
545 protected ResultInfo dup(CheckMode newMode) {
546 return new ResultInfo(pkind, pt, checkContext, newMode);
547 }
548
549 @Override
550 public String toString() {
551 if (pt != null) {
552 return pt.toString();
553 } else {
554 return "";
555 }
556 }
557 }
558
559 class MethodAttrInfo extends ResultInfo {
560 public MethodAttrInfo() {
561 this(chk.basicHandler);
562 }
563
564 public MethodAttrInfo(CheckContext checkContext) {
565 super(KindSelector.VAL, Infer.anyPoly, checkContext);
566 }
567
568 @Override
569 protected boolean needsArgumentAttr(JCTree tree) {
570 return true;
571 }
572
573 protected ResultInfo dup(Type newPt) {
574 throw new IllegalStateException();
575 }
576
577 protected ResultInfo dup(CheckContext newContext) {
578 return new MethodAttrInfo(newContext);
579 }
580
581 protected ResultInfo dup(Type newPt, CheckContext newContext) {
582 throw new IllegalStateException();
583 }
584
585 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
586 throw new IllegalStateException();
587 }
588
589 protected ResultInfo dup(CheckMode newMode) {
590 throw new IllegalStateException();
591 }
592 }
593
594 class RecoveryInfo extends ResultInfo {
595
596 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
597 this(deferredAttrContext, Type.recoveryType);
598 }
599
600 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
601 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
602 @Override
603 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
604 return deferredAttrContext;
605 }
606 @Override
607 public boolean compatible(Type found, Type req, Warner warn) {
608 return true;
609 }
610 @Override
611 public void report(DiagnosticPosition pos, JCDiagnostic details) {
612 boolean needsReport = pt == Type.recoveryType ||
613 (details.getDiagnosticPosition() != null &&
614 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
615 if (needsReport) {
616 chk.basicHandler.report(pos, details);
617 }
618 }
619 });
620 }
621 }
622
623 final ResultInfo statInfo;
624 final ResultInfo varAssignmentInfo;
625 final ResultInfo methodAttrInfo;
626 final ResultInfo unknownExprInfo;
627 final ResultInfo unknownTypeInfo;
628 final ResultInfo unknownTypeExprInfo;
629 final ResultInfo recoveryInfo;
630
631 Type pt() {
632 return resultInfo.pt;
633 }
634
635 KindSelector pkind() {
636 return resultInfo.pkind;
637 }
638
639 /* ************************************************************************
640 * Visitor methods
641 *************************************************************************/
642
643 /** Visitor argument: the current environment.
644 */
645 Env<AttrContext> env;
646
647 /** Visitor argument: the currently expected attribution result.
648 */
649 ResultInfo resultInfo;
650
651 /** Visitor result: the computed type.
652 */
653 Type result;
654
655 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
656
657 /** Visitor method: attribute a tree, catching any completion failure
658 * exceptions. Return the tree's type.
659 *
660 * @param tree The tree to be visited.
661 * @param env The environment visitor argument.
662 * @param resultInfo The result info visitor argument.
663 */
664 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
665 Env<AttrContext> prevEnv = this.env;
666 ResultInfo prevResult = this.resultInfo;
667 try {
668 this.env = env;
669 this.resultInfo = resultInfo;
670 if (resultInfo.needsArgumentAttr(tree)) {
671 result = argumentAttr.attribArg(tree, env);
672 } else {
673 tree.accept(this);
674 }
675 matchBindings = matchBindingsComputer.finishBindings(tree,
676 matchBindings);
677 if (tree == breakTree &&
678 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
679 breakTreeFound(copyEnv(env));
680 }
681 return result;
682 } catch (CompletionFailure ex) {
683 tree.type = syms.errType;
684 return chk.completionError(tree.pos(), ex);
685 } finally {
686 this.env = prevEnv;
687 this.resultInfo = prevResult;
688 }
689 }
690
691 protected void breakTreeFound(Env<AttrContext> env) {
692 throw new BreakAttr(env);
693 }
694
695 Env<AttrContext> copyEnv(Env<AttrContext> env) {
696 Env<AttrContext> newEnv =
697 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
698 if (newEnv.outer != null) {
699 newEnv.outer = copyEnv(newEnv.outer);
700 }
701 return newEnv;
702 }
703
704 WriteableScope copyScope(WriteableScope sc) {
705 WriteableScope newScope = WriteableScope.create(sc.owner);
706 List<Symbol> elemsList = List.nil();
707 for (Symbol sym : sc.getSymbols()) {
708 elemsList = elemsList.prepend(sym);
709 }
710 for (Symbol s : elemsList) {
711 newScope.enter(s);
712 }
713 return newScope;
714 }
715
716 /** Derived visitor method: attribute an expression tree.
717 */
718 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
719 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
720 }
721
722 /** Derived visitor method: attribute an expression tree with
723 * no constraints on the computed type.
724 */
725 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
726 return attribTree(tree, env, unknownExprInfo);
727 }
728
729 /** Derived visitor method: attribute a type tree.
730 */
731 public Type attribType(JCTree tree, Env<AttrContext> env) {
732 Type result = attribType(tree, env, Type.noType);
733 return result;
734 }
735
736 /** Derived visitor method: attribute a type tree.
737 */
738 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
739 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
740 return result;
741 }
742
743 /** Derived visitor method: attribute a statement or definition tree.
744 */
745 public Type attribStat(JCTree tree, Env<AttrContext> env) {
746 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
747 Type result = attribTree(tree, env, statInfo);
748 analyzer.analyzeIfNeeded(tree, analyzeEnv);
749 attrRecover.doRecovery();
750 return result;
751 }
752
753 /** Attribute a list of expressions, returning a list of types.
754 */
755 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
756 ListBuffer<Type> ts = new ListBuffer<>();
757 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
758 ts.append(attribExpr(l.head, env, pt));
759 return ts.toList();
760 }
761
762 /** Attribute a list of statements, returning nothing.
763 */
764 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
765 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
766 attribStat(l.head, env);
767 }
768
769 /** Attribute the arguments in a method call, returning the method kind.
770 */
771 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
772 KindSelector kind = initialKind;
773 for (JCExpression arg : trees) {
774 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
775 if (argtype.hasTag(DEFERRED)) {
776 kind = KindSelector.of(KindSelector.POLY, kind);
777 }
778 argtypes.append(argtype);
779 }
780 return kind;
781 }
782
783 /** Attribute a type argument list, returning a list of types.
784 * Caller is responsible for calling checkRefTypes.
785 */
786 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
787 ListBuffer<Type> argtypes = new ListBuffer<>();
788 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
789 argtypes.append(attribType(l.head, env));
790 return argtypes.toList();
791 }
792
793 /** Attribute a type argument list, returning a list of types.
794 * Check that all the types are references.
795 */
796 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
797 List<Type> types = attribAnyTypes(trees, env);
798 return chk.checkRefTypes(trees, types);
799 }
800
801 /**
802 * Attribute type variables (of generic classes or methods).
803 * Compound types are attributed later in attribBounds.
804 * @param typarams the type variables to enter
805 * @param env the current environment
806 */
807 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
808 for (JCTypeParameter tvar : typarams) {
809 TypeVar a = (TypeVar)tvar.type;
810 a.tsym.flags_field |= UNATTRIBUTED;
811 a.setUpperBound(Type.noType);
812 if (!tvar.bounds.isEmpty()) {
813 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
814 for (JCExpression bound : tvar.bounds.tail)
815 bounds = bounds.prepend(attribType(bound, env));
816 types.setBounds(a, bounds.reverse());
817 } else {
818 // if no bounds are given, assume a single bound of
819 // java.lang.Object.
820 types.setBounds(a, List.of(syms.objectType));
821 }
822 a.tsym.flags_field &= ~UNATTRIBUTED;
823 }
824 if (checkCyclic) {
825 for (JCTypeParameter tvar : typarams) {
826 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
827 }
828 }
829 }
830
831 /**
832 * Attribute the type references in a list of annotations.
833 */
834 void attribAnnotationTypes(List<JCAnnotation> annotations,
835 Env<AttrContext> env) {
836 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
837 JCAnnotation a = al.head;
838 attribType(a.annotationType, env);
839 }
840 }
841
842 /**
843 * Attribute a "lazy constant value".
844 * @param env The env for the const value
845 * @param variable The initializer for the const value
846 * @param type The expected type, or null
847 * @see VarSymbol#setLazyConstValue
848 */
849 public Object attribLazyConstantValue(Env<AttrContext> env,
850 JCVariableDecl variable,
851 Type type) {
852
853 DiagnosticPosition prevLintPos
854 = deferredLintHandler.setPos(variable.pos());
855
856 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
857 try {
858 Type itype = attribExpr(variable.init, env, type);
859 if (variable.isImplicitlyTyped()) {
860 //fixup local variable type
861 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
862 }
863 if (itype.constValue() != null) {
864 return coerce(itype, type).constValue();
865 } else {
866 return null;
867 }
868 } finally {
869 log.useSource(prevSource);
870 deferredLintHandler.setPos(prevLintPos);
871 }
872 }
873
874 /** Attribute type reference in an `extends' or `implements' clause.
875 * Supertypes of anonymous inner classes are usually already attributed.
876 *
877 * @param tree The tree making up the type reference.
878 * @param env The environment current at the reference.
879 * @param classExpected true if only a class is expected here.
880 * @param interfaceExpected true if only an interface is expected here.
881 */
882 Type attribBase(JCTree tree,
883 Env<AttrContext> env,
884 boolean classExpected,
885 boolean interfaceExpected,
886 boolean checkExtensible) {
887 Type t = tree.type != null ?
888 tree.type :
889 attribType(tree, env);
890 try {
891 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
892 } catch (CompletionFailure ex) {
893 chk.completionError(tree.pos(), ex);
894 return t;
895 }
896 }
897 Type checkBase(Type t,
898 JCTree tree,
899 Env<AttrContext> env,
900 boolean classExpected,
901 boolean interfaceExpected,
902 boolean checkExtensible) {
903 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
904 (((JCTypeApply) tree).clazz).pos() : tree.pos();
905 if (t.tsym.isAnonymous()) {
906 log.error(pos, Errors.CantInheritFromAnon);
907 return types.createErrorType(t);
908 }
909 if (t.isErroneous())
910 return t;
911 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
912 // check that type variable is already visible
913 if (t.getUpperBound() == null) {
914 log.error(pos, Errors.IllegalForwardRef);
915 return types.createErrorType(t);
916 }
917 } else {
918 t = chk.checkClassType(pos, t, checkExtensible);
919 }
920 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
921 log.error(pos, Errors.IntfExpectedHere);
922 // return errType is necessary since otherwise there might
923 // be undetected cycles which cause attribution to loop
924 return types.createErrorType(t);
925 } else if (checkExtensible &&
926 classExpected &&
927 (t.tsym.flags() & INTERFACE) != 0) {
928 log.error(pos, Errors.NoIntfExpectedHere);
929 return types.createErrorType(t);
930 }
931 if (checkExtensible &&
932 ((t.tsym.flags() & FINAL) != 0)) {
933 log.error(pos,
934 Errors.CantInheritFromFinal(t.tsym));
935 }
936 chk.checkNonCyclic(pos, t);
937 return t;
938 }
939
940 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
941 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
942 id.type = env.info.scope.owner.enclClass().type;
943 id.sym = env.info.scope.owner.enclClass();
944 return id.type;
945 }
946
947 public void visitClassDef(JCClassDecl tree) {
948 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
949 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
950 argumentAttr.withLocalCacheContext() : null);
951 boolean ctorProloguePrev = env.info.ctorPrologue;
952 env.info.ctorPrologue = false;
953 try {
954 // Local and anonymous classes have not been entered yet, so we need to
955 // do it now.
956 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
957 enter.classEnter(tree, env);
958 } else {
959 // If this class declaration is part of a class level annotation,
960 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
961 // order to simplify later steps and allow for sensible error
962 // messages.
963 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
964 enter.classEnter(tree, env);
965 }
966
967 ClassSymbol c = tree.sym;
968 if (c == null) {
969 // exit in case something drastic went wrong during enter.
970 result = null;
971 } else {
972 // make sure class has been completed:
973 c.complete();
974
975 // If this class appears as an anonymous class in a constructor
976 // prologue, disable implicit outer instance from being passed.
977 // (This would be an illegal access to "this before super").
978 if (ctorProloguePrev && env.tree.hasTag(NEWCLASS)) {
979 c.flags_field |= NOOUTERTHIS;
980 }
981 attribClass(tree.pos(), c);
982 result = tree.type = c.type;
983 }
984 } finally {
985 localCacheContext.ifPresent(LocalCacheContext::leave);
986 env.info.ctorPrologue = ctorProloguePrev;
987 }
988 }
989
990 public void visitMethodDef(JCMethodDecl tree) {
991 MethodSymbol m = tree.sym;
992 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
993
994 Lint lint = env.info.lint.augment(m);
995 Lint prevLint = chk.setLint(lint);
996 boolean ctorProloguePrev = env.info.ctorPrologue;
997 env.info.ctorPrologue = false;
998 MethodSymbol prevMethod = chk.setMethod(m);
999 try {
1000 deferredLintHandler.flush(tree.pos());
1001 chk.checkDeprecatedAnnotation(tree.pos(), m);
1002
1003
1004 // Create a new environment with local scope
1005 // for attributing the method.
1006 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1007 localEnv.info.lint = lint;
1008
1009 attribStats(tree.typarams, localEnv);
1010
1011 // If we override any other methods, check that we do so properly.
1012 // JLS ???
1013 if (m.isStatic()) {
1014 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1015 } else {
1016 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1017 }
1018 chk.checkOverride(env, tree, m);
1019
1020 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1021 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1022 }
1023
1024 // Enter all type parameters into the local method scope.
1025 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1026 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1027
1028 ClassSymbol owner = env.enclClass.sym;
1029 if ((owner.flags() & ANNOTATION) != 0 &&
1030 (tree.params.nonEmpty() ||
1031 tree.recvparam != null))
1032 log.error(tree.params.nonEmpty() ?
1033 tree.params.head.pos() :
1034 tree.recvparam.pos(),
1035 Errors.IntfAnnotationMembersCantHaveParams);
1036
1037 // Attribute all value parameters.
1038 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1039 attribStat(l.head, localEnv);
1040 }
1041
1042 chk.checkVarargsMethodDecl(localEnv, tree);
1043
1044 // Check that type parameters are well-formed.
1045 chk.validate(tree.typarams, localEnv);
1046
1047 // Check that result type is well-formed.
1048 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1049 chk.validate(tree.restype, localEnv);
1050
1051 // Check that receiver type is well-formed.
1052 if (tree.recvparam != null) {
1053 // Use a new environment to check the receiver parameter.
1054 // Otherwise I get "might not have been initialized" errors.
1055 // Is there a better way?
1056 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1057 attribType(tree.recvparam, newEnv);
1058 chk.validate(tree.recvparam, newEnv);
1059 }
1060
1061 // Is this method a constructor?
1062 boolean isConstructor = TreeInfo.isConstructor(tree);
1063
1064 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1065 // lets find if this method is an accessor
1066 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1067 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1068 if (recordComponent.isPresent()) {
1069 // the method is a user defined accessor lets check that everything is fine
1070 if (!tree.sym.isPublic()) {
1071 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1072 }
1073 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1074 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1075 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1076 }
1077 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1078 log.error(tree,
1079 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1080 }
1081 if (!tree.typarams.isEmpty()) {
1082 log.error(tree,
1083 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1084 }
1085 if (tree.sym.isStatic()) {
1086 log.error(tree,
1087 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1088 }
1089 }
1090
1091 if (isConstructor) {
1092 // if this a constructor other than the canonical one
1093 if ((tree.sym.flags_field & RECORD) == 0) {
1094 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1095 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1096 }
1097 } else {
1098 // but if it is the canonical:
1099
1100 /* if user generated, then it shouldn't:
1101 * - have an accessibility stricter than that of the record type
1102 * - explicitly invoke any other constructor
1103 */
1104 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1105 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1106 log.error(tree,
1107 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1108 Errors.InvalidCanonicalConstructorInRecord(
1109 Fragments.Canonical,
1110 env.enclClass.sym.name,
1111 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1112 ) :
1113 Errors.InvalidCanonicalConstructorInRecord(
1114 Fragments.Canonical,
1115 env.enclClass.sym.name,
1116 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1117 )
1118 );
1119 }
1120
1121 if (TreeInfo.hasAnyConstructorCall(tree)) {
1122 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1123 Fragments.Canonical, env.enclClass.sym.name,
1124 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1125 }
1126 }
1127
1128 // also we want to check that no type variables have been defined
1129 if (!tree.typarams.isEmpty()) {
1130 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1131 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1132 }
1133
1134 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1135 * record components
1136 */
1137 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1138 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1139 for (JCVariableDecl param: tree.params) {
1140 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1141 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1142 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1143 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1144 Fragments.Canonical, env.enclClass.sym.name,
1145 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1146 }
1147 recordComponents = recordComponents.tail;
1148 recordFieldTypes = recordFieldTypes.tail;
1149 }
1150 }
1151 }
1152 }
1153
1154 // annotation method checks
1155 if ((owner.flags() & ANNOTATION) != 0) {
1156 // annotation method cannot have throws clause
1157 if (tree.thrown.nonEmpty()) {
1158 log.error(tree.thrown.head.pos(),
1159 Errors.ThrowsNotAllowedInIntfAnnotation);
1160 }
1161 // annotation method cannot declare type-parameters
1162 if (tree.typarams.nonEmpty()) {
1163 log.error(tree.typarams.head.pos(),
1164 Errors.IntfAnnotationMembersCantHaveTypeParams);
1165 }
1166 // validate annotation method's return type (could be an annotation type)
1167 chk.validateAnnotationType(tree.restype);
1168 // ensure that annotation method does not clash with members of Object/Annotation
1169 chk.validateAnnotationMethod(tree.pos(), m);
1170 }
1171
1172 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1173 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1174
1175 if (tree.body == null) {
1176 // Empty bodies are only allowed for
1177 // abstract, native, or interface methods, or for methods
1178 // in a retrofit signature class.
1179 if (tree.defaultValue != null) {
1180 if ((owner.flags() & ANNOTATION) == 0)
1181 log.error(tree.pos(),
1182 Errors.DefaultAllowedInIntfAnnotationMember);
1183 }
1184 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1185 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1186 } else {
1187 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1188 if ((owner.flags() & INTERFACE) != 0) {
1189 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1190 } else {
1191 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1192 }
1193 } else if ((tree.mods.flags & NATIVE) != 0) {
1194 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1195 }
1196 // Add an implicit super() call unless an explicit call to
1197 // super(...) or this(...) is given
1198 // or we are compiling class java.lang.Object.
1199 if (isConstructor && owner.type != syms.objectType) {
1200 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1201 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1202 make.Ident(names._super), make.Idents(List.nil())));
1203 if (owner.isValueClass()) {
1204 tree.body.stats = tree.body.stats.append(supCall);
1205 } else {
1206 tree.body.stats = tree.body.stats.prepend(supCall);
1207 }
1208 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1209 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1210 TreeInfo.hasConstructorCall(tree, names._super)) {
1211 // enum constructors are not allowed to call super
1212 // directly, so make sure there aren't any super calls
1213 // in enum constructors, except in the compiler
1214 // generated one.
1215 log.error(tree.body.stats.head.pos(),
1216 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1217 }
1218 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1219 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1220 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1221 if (!initParamNames.equals(recordComponentNames)) {
1222 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1223 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1224 }
1225 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1226 log.error(tree,
1227 Errors.InvalidCanonicalConstructorInRecord(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1229 env.enclClass.sym.name,
1230 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1231 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1232 }
1233 }
1234 }
1235
1236 // Attribute all type annotations in the body
1237 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1238 annotate.flush();
1239
1240 // Start of constructor prologue
1241 localEnv.info.ctorPrologue = isConstructor;
1242
1243 // Attribute method body.
1244 attribStat(tree.body, localEnv);
1245 }
1246
1247 localEnv.info.scope.leave();
1248 result = tree.type = m.type;
1249 } finally {
1250 chk.setLint(prevLint);
1251 chk.setMethod(prevMethod);
1252 env.info.ctorPrologue = ctorProloguePrev;
1253 }
1254 }
1255
1256 public void visitVarDef(JCVariableDecl tree) {
1257 // Local variables have not been entered yet, so we need to do it now:
1258 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1259 if (tree.sym != null) {
1260 // parameters have already been entered
1261 env.info.scope.enter(tree.sym);
1262 } else {
1263 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1264 if (tree.init == null) {
1265 //cannot use 'var' without initializer
1266 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1267 tree.vartype = make.Erroneous();
1268 } else {
1269 Fragment msg = canInferLocalVarType(tree);
1270 if (msg != null) {
1271 //cannot use 'var' with initializer which require an explicit target
1272 //(e.g. lambda, method reference, array initializer).
1273 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1274 tree.vartype = make.Erroneous();
1275 }
1276 }
1277 }
1278 try {
1279 annotate.blockAnnotations();
1280 memberEnter.memberEnter(tree, env);
1281 } finally {
1282 annotate.unblockAnnotations();
1283 }
1284 }
1285 } else {
1286 if (tree.init != null) {
1287 // Field initializer expression need to be entered.
1288 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1289 annotate.flush();
1290 }
1291 }
1292
1293 VarSymbol v = tree.sym;
1294 Lint lint = env.info.lint.augment(v);
1295 Lint prevLint = chk.setLint(lint);
1296
1297 // Check that the variable's declared type is well-formed.
1298 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1299 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1300 (tree.sym.flags() & PARAMETER) != 0;
1301 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1302
1303 try {
1304 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1305 deferredLintHandler.flush(tree.pos());
1306 chk.checkDeprecatedAnnotation(tree.pos(), v);
1307
1308 if (tree.init != null) {
1309 if ((v.flags_field & FINAL) == 0 ||
1310 !memberEnter.needsLazyConstValue(tree.init)) {
1311 // Not a compile-time constant
1312 // Attribute initializer in a new environment
1313 // with the declared variable as owner.
1314 // Check that initializer conforms to variable's declared type.
1315 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1316 initEnv.info.lint = lint;
1317 // In order to catch self-references, we set the variable's
1318 // declaration position to maximal possible value, effectively
1319 // marking the variable as undefined.
1320 initEnv.info.enclVar = v;
1321 attribExpr(tree.init, initEnv, v.type);
1322 if (tree.isImplicitlyTyped()) {
1323 //fixup local variable type
1324 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1325 }
1326 }
1327 if (tree.isImplicitlyTyped()) {
1328 setSyntheticVariableType(tree, v.type);
1329 }
1330 }
1331 result = tree.type = v.type;
1332 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1333 if (isNonArgsMethodInObject(v.name)) {
1334 log.error(tree, Errors.IllegalRecordComponentName(v));
1335 }
1336 }
1337 }
1338 finally {
1339 chk.setLint(prevLint);
1340 }
1341 }
1342
1343 private boolean isNonArgsMethodInObject(Name name) {
1344 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1345 if (s.type.getParameterTypes().isEmpty()) {
1346 return true;
1347 }
1348 }
1349 // isValueObject is not included in Object yet so we need a work around
1350 return name == names.isValueObject;
1351 }
1352
1353 Fragment canInferLocalVarType(JCVariableDecl tree) {
1354 LocalInitScanner lis = new LocalInitScanner();
1355 lis.scan(tree.init);
1356 return lis.badInferenceMsg;
1357 }
1358
1359 static class LocalInitScanner extends TreeScanner {
1360 Fragment badInferenceMsg = null;
1361 boolean needsTarget = true;
1362
1363 @Override
1364 public void visitNewArray(JCNewArray tree) {
1365 if (tree.elemtype == null && needsTarget) {
1366 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1367 }
1368 }
1369
1370 @Override
1371 public void visitLambda(JCLambda tree) {
1372 if (needsTarget) {
1373 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1374 }
1375 }
1376
1377 @Override
1378 public void visitTypeCast(JCTypeCast tree) {
1379 boolean prevNeedsTarget = needsTarget;
1380 try {
1381 needsTarget = false;
1382 super.visitTypeCast(tree);
1383 } finally {
1384 needsTarget = prevNeedsTarget;
1385 }
1386 }
1387
1388 @Override
1389 public void visitReference(JCMemberReference tree) {
1390 if (needsTarget) {
1391 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1392 }
1393 }
1394
1395 @Override
1396 public void visitNewClass(JCNewClass tree) {
1397 boolean prevNeedsTarget = needsTarget;
1398 try {
1399 needsTarget = false;
1400 super.visitNewClass(tree);
1401 } finally {
1402 needsTarget = prevNeedsTarget;
1403 }
1404 }
1405
1406 @Override
1407 public void visitApply(JCMethodInvocation tree) {
1408 boolean prevNeedsTarget = needsTarget;
1409 try {
1410 needsTarget = false;
1411 super.visitApply(tree);
1412 } finally {
1413 needsTarget = prevNeedsTarget;
1414 }
1415 }
1416 }
1417
1418 public void visitSkip(JCSkip tree) {
1419 result = null;
1420 }
1421
1422 public void visitBlock(JCBlock tree) {
1423 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1424 // Block is a static or instance initializer;
1425 // let the owner of the environment be a freshly
1426 // created BLOCK-method.
1427 Symbol fakeOwner =
1428 new MethodSymbol(tree.flags | BLOCK |
1429 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1430 env.info.scope.owner);
1431 final Env<AttrContext> localEnv =
1432 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1433
1434 if ((tree.flags & STATIC) != 0) {
1435 localEnv.info.staticLevel++;
1436 } else {
1437 localEnv.info.instanceInitializerBlock = true;
1438 }
1439 // Attribute all type annotations in the block
1440 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1441 annotate.flush();
1442 attribStats(tree.stats, localEnv);
1443
1444 {
1445 // Store init and clinit type annotations with the ClassSymbol
1446 // to allow output in Gen.normalizeDefs.
1447 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1448 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1449 if ((tree.flags & STATIC) != 0) {
1450 cs.appendClassInitTypeAttributes(tas);
1451 } else {
1452 cs.appendInitTypeAttributes(tas);
1453 }
1454 }
1455 } else {
1456 // Create a new local environment with a local scope.
1457 Env<AttrContext> localEnv =
1458 env.dup(tree, env.info.dup(env.info.scope.dup()));
1459 try {
1460 attribStats(tree.stats, localEnv);
1461 } finally {
1462 localEnv.info.scope.leave();
1463 }
1464 }
1465 result = null;
1466 }
1467
1468 public void visitDoLoop(JCDoWhileLoop tree) {
1469 attribStat(tree.body, env.dup(tree));
1470 attribExpr(tree.cond, env, syms.booleanType);
1471 handleLoopConditionBindings(matchBindings, tree, tree.body);
1472 result = null;
1473 }
1474
1475 public void visitWhileLoop(JCWhileLoop tree) {
1476 attribExpr(tree.cond, env, syms.booleanType);
1477 MatchBindings condBindings = matchBindings;
1478 // include condition's bindings when true in the body:
1479 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1480 try {
1481 attribStat(tree.body, whileEnv.dup(tree));
1482 } finally {
1483 whileEnv.info.scope.leave();
1484 }
1485 handleLoopConditionBindings(condBindings, tree, tree.body);
1486 result = null;
1487 }
1488
1489 public void visitForLoop(JCForLoop tree) {
1490 Env<AttrContext> loopEnv =
1491 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1492 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1493 try {
1494 attribStats(tree.init, loopEnv);
1495 if (tree.cond != null) {
1496 attribExpr(tree.cond, loopEnv, syms.booleanType);
1497 // include condition's bindings when true in the body and step:
1498 condBindings = matchBindings;
1499 }
1500 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1501 try {
1502 bodyEnv.tree = tree; // before, we were not in loop!
1503 attribStats(tree.step, bodyEnv);
1504 attribStat(tree.body, bodyEnv);
1505 } finally {
1506 bodyEnv.info.scope.leave();
1507 }
1508 result = null;
1509 }
1510 finally {
1511 loopEnv.info.scope.leave();
1512 }
1513 handleLoopConditionBindings(condBindings, tree, tree.body);
1514 }
1515
1516 /**
1517 * Include condition's bindings when false after the loop, if cannot get out of the loop
1518 */
1519 private void handleLoopConditionBindings(MatchBindings condBindings,
1520 JCStatement loop,
1521 JCStatement loopBody) {
1522 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1523 !breaksTo(env, loop, loopBody)) {
1524 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1525 }
1526 }
1527
1528 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1529 preFlow(body);
1530 return flow.breaksToTree(env, loop, body, make);
1531 }
1532
1533 /**
1534 * Add given bindings to the current scope, unless there's a break to
1535 * an immediately enclosing labeled statement.
1536 */
1537 private void addBindings2Scope(JCStatement introducingStatement,
1538 List<BindingSymbol> bindings) {
1539 if (bindings.isEmpty()) {
1540 return ;
1541 }
1542
1543 var searchEnv = env;
1544 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1545 labeled.body == introducingStatement) {
1546 if (breaksTo(env, labeled, labeled.body)) {
1547 //breaking to an immediately enclosing labeled statement
1548 return ;
1549 }
1550 searchEnv = searchEnv.next;
1551 introducingStatement = labeled;
1552 }
1553
1554 //include condition's body when false after the while, if cannot get out of the loop
1555 bindings.forEach(env.info.scope::enter);
1556 bindings.forEach(BindingSymbol::preserveBinding);
1557 }
1558
1559 public void visitForeachLoop(JCEnhancedForLoop tree) {
1560 Env<AttrContext> loopEnv =
1561 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1562 try {
1563 //the Formal Parameter of a for-each loop is not in the scope when
1564 //attributing the for-each expression; we mimic this by attributing
1565 //the for-each expression first (against original scope).
1566 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1567 chk.checkNonVoid(tree.pos(), exprType);
1568 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1569 if (elemtype == null) {
1570 // or perhaps expr implements Iterable<T>?
1571 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1572 if (base == null) {
1573 log.error(tree.expr.pos(),
1574 Errors.ForeachNotApplicableToType(exprType,
1575 Fragments.TypeReqArrayOrIterable));
1576 elemtype = types.createErrorType(exprType);
1577 } else {
1578 List<Type> iterableParams = base.allparams();
1579 elemtype = iterableParams.isEmpty()
1580 ? syms.objectType
1581 : types.wildUpperBound(iterableParams.head);
1582
1583 // Check the return type of the method iterator().
1584 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1585 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1586 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1587 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1588 log.error(tree.pos(),
1589 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1590 }
1591 }
1592 }
1593 if (tree.var.isImplicitlyTyped()) {
1594 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1595 setSyntheticVariableType(tree.var, inferredType);
1596 }
1597 attribStat(tree.var, loopEnv);
1598 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1599 loopEnv.tree = tree; // before, we were not in loop!
1600 attribStat(tree.body, loopEnv);
1601 result = null;
1602 }
1603 finally {
1604 loopEnv.info.scope.leave();
1605 }
1606 }
1607
1608 public void visitLabelled(JCLabeledStatement tree) {
1609 // Check that label is not used in an enclosing statement
1610 Env<AttrContext> env1 = env;
1611 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1612 if (env1.tree.hasTag(LABELLED) &&
1613 ((JCLabeledStatement) env1.tree).label == tree.label) {
1614 log.error(tree.pos(),
1615 Errors.LabelAlreadyInUse(tree.label));
1616 break;
1617 }
1618 env1 = env1.next;
1619 }
1620
1621 attribStat(tree.body, env.dup(tree));
1622 result = null;
1623 }
1624
1625 public void visitSwitch(JCSwitch tree) {
1626 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1627 attribStats(c.stats, caseEnv);
1628 });
1629 result = null;
1630 }
1631
1632 public void visitSwitchExpression(JCSwitchExpression tree) {
1633 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1634 PolyKind.STANDALONE : PolyKind.POLY;
1635
1636 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1637 //this means we are returning a poly conditional from void-compatible lambda expression
1638 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1639 result = tree.type = types.createErrorType(resultInfo.pt);
1640 return;
1641 }
1642
1643 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1644 unknownExprInfo :
1645 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1646
1647 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1648 ListBuffer<Type> caseTypes = new ListBuffer<>();
1649
1650 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1651 caseEnv.info.yieldResult = condInfo;
1652 attribStats(c.stats, caseEnv);
1653 new TreeScanner() {
1654 @Override
1655 public void visitYield(JCYield brk) {
1656 if (brk.target == tree) {
1657 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1658 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1659 }
1660 super.visitYield(brk);
1661 }
1662
1663 @Override public void visitClassDef(JCClassDecl tree) {}
1664 @Override public void visitLambda(JCLambda tree) {}
1665 }.scan(c.stats);
1666 });
1667
1668 if (tree.cases.isEmpty()) {
1669 log.error(tree.pos(),
1670 Errors.SwitchExpressionEmpty);
1671 } else if (caseTypes.isEmpty()) {
1672 log.error(tree.pos(),
1673 Errors.SwitchExpressionNoResultExpressions);
1674 }
1675
1676 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1677
1678 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1679 }
1680 //where:
1681 CheckContext switchExpressionContext(CheckContext checkContext) {
1682 return new Check.NestedCheckContext(checkContext) {
1683 //this will use enclosing check context to check compatibility of
1684 //subexpression against target type; if we are in a method check context,
1685 //depending on whether boxing is allowed, we could have incompatibilities
1686 @Override
1687 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1688 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1689 }
1690 };
1691 }
1692
1693 private void handleSwitch(JCTree switchTree,
1694 JCExpression selector,
1695 List<JCCase> cases,
1696 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1697 Type seltype = attribExpr(selector, env);
1698
1699 Env<AttrContext> switchEnv =
1700 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1701
1702 try {
1703 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1704 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1705 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1706 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1707 boolean errorPrimitiveSwitch = seltype.isPrimitive() && !intSwitch;
1708 boolean patternSwitch;
1709 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1710 !intSwitch && !errorPrimitiveSwitch) {
1711 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1712 patternSwitch = true;
1713 } else {
1714 if (errorPrimitiveSwitch) {
1715 log.error(selector.pos(), Errors.SelectorTypeNotAllowed(seltype));
1716 }
1717 patternSwitch = cases.stream()
1718 .flatMap(c -> c.labels.stream())
1719 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1720 TreeInfo.isNullCaseLabel(l));
1721 }
1722
1723 // Attribute all cases and
1724 // check that there are no duplicate case labels or default clauses.
1725 Set<Object> constants = new HashSet<>(); // The set of case constants.
1726 boolean hasDefault = false; // Is there a default label?
1727 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1728 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1729 boolean hasNullPattern = false; // Is there a null pattern?
1730 CaseTree.CaseKind caseKind = null;
1731 boolean wasError = false;
1732 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1733 JCCase c = l.head;
1734 if (caseKind == null) {
1735 caseKind = c.caseKind;
1736 } else if (caseKind != c.caseKind && !wasError) {
1737 log.error(c.pos(),
1738 Errors.SwitchMixingCaseTypes);
1739 wasError = true;
1740 }
1741 MatchBindings currentBindings = null;
1742 MatchBindings guardBindings = null;
1743 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1744 JCCaseLabel label = labels.head;
1745 if (label instanceof JCConstantCaseLabel constLabel) {
1746 JCExpression expr = constLabel.expr;
1747 if (TreeInfo.isNull(expr)) {
1748 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1749 if (hasNullPattern) {
1750 log.error(label.pos(), Errors.DuplicateCaseLabel);
1751 }
1752 hasNullPattern = true;
1753 attribExpr(expr, switchEnv, seltype);
1754 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1755 } else if (enumSwitch) {
1756 Symbol sym = enumConstant(expr, seltype);
1757 if (sym == null) {
1758 if (allowPatternSwitch) {
1759 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1760 Symbol enumSym = TreeInfo.symbol(expr);
1761 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1762 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1763 } else if (!constants.add(enumSym)) {
1764 log.error(label.pos(), Errors.DuplicateCaseLabel);
1765 }
1766 } else {
1767 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1768 }
1769 } else if (!constants.add(sym)) {
1770 log.error(label.pos(), Errors.DuplicateCaseLabel);
1771 }
1772 } else if (errorEnumSwitch) {
1773 //error recovery: the selector is erroneous, and all the case labels
1774 //are identifiers. This could be an enum switch - don't report resolve
1775 //error for the case label:
1776 var prevResolveHelper = rs.basicLogResolveHelper;
1777 try {
1778 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1779 attribExpr(expr, switchEnv, seltype);
1780 } finally {
1781 rs.basicLogResolveHelper = prevResolveHelper;
1782 }
1783 } else {
1784 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1785 if (!pattype.hasTag(ERROR)) {
1786 if (pattype.constValue() == null) {
1787 Symbol s = TreeInfo.symbol(expr);
1788 if (s != null && s.kind == TYP) {
1789 log.error(expr.pos(),
1790 Errors.PatternExpected);
1791 } else if (s == null || !s.isEnum()) {
1792 log.error(expr.pos(),
1793 (stringSwitch ? Errors.StringConstReq
1794 : intSwitch ? Errors.ConstExprReq
1795 : Errors.PatternOrEnumReq));
1796 } else if (!constants.add(s)) {
1797 log.error(label.pos(), Errors.DuplicateCaseLabel);
1798 }
1799 } else if (!stringSwitch && !intSwitch && !errorPrimitiveSwitch) {
1800 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1801 } else if (!constants.add(pattype.constValue())) {
1802 log.error(c.pos(), Errors.DuplicateCaseLabel);
1803 }
1804 }
1805 }
1806 } else if (label instanceof JCDefaultCaseLabel def) {
1807 if (hasDefault) {
1808 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1809 } else if (hasUnconditionalPattern) {
1810 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1811 }
1812 hasDefault = true;
1813 matchBindings = MatchBindingsComputer.EMPTY;
1814 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1815 //pattern
1816 JCPattern pat = patternlabel.pat;
1817 attribExpr(pat, switchEnv, seltype);
1818 Type primaryType = TreeInfo.primaryPatternType(pat);
1819 if (!primaryType.hasTag(TYPEVAR)) {
1820 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1821 }
1822 if (!errorPrimitiveSwitch) {
1823 checkCastablePattern(pat.pos(), seltype, primaryType);
1824 }
1825 Type patternType = types.erasure(primaryType);
1826 JCExpression guard = c.guard;
1827 if (guardBindings == null && guard != null) {
1828 MatchBindings afterPattern = matchBindings;
1829 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1830 try {
1831 attribExpr(guard, bodyEnv, syms.booleanType);
1832 } finally {
1833 bodyEnv.info.scope.leave();
1834 }
1835
1836 guardBindings = matchBindings;
1837 matchBindings = afterPattern;
1838
1839 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1840 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1841 }
1842 }
1843 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1844 boolean unconditional =
1845 unguarded &&
1846 !patternType.isErroneous() &&
1847 types.isSubtype(types.boxedTypeOrType(types.erasure(seltype)),
1848 patternType);
1849 if (unconditional) {
1850 if (hasUnconditionalPattern) {
1851 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1852 } else if (hasDefault) {
1853 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1854 }
1855 hasUnconditionalPattern = true;
1856 }
1857 lastPatternErroneous = patternType.isErroneous();
1858 } else {
1859 Assert.error();
1860 }
1861 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1862 }
1863
1864 if (guardBindings != null) {
1865 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1866 }
1867
1868 Env<AttrContext> caseEnv =
1869 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1870 try {
1871 attribCase.accept(c, caseEnv);
1872 } finally {
1873 caseEnv.info.scope.leave();
1874 }
1875 addVars(c.stats, switchEnv.info.scope);
1876
1877 preFlow(c);
1878 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1879 }
1880 if (patternSwitch) {
1881 chk.checkSwitchCaseStructure(cases);
1882 chk.checkSwitchCaseLabelDominated(cases);
1883 }
1884 if (switchTree.hasTag(SWITCH)) {
1885 ((JCSwitch) switchTree).hasUnconditionalPattern =
1886 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1887 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1888 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1889 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1890 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1891 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1892 } else {
1893 Assert.error(switchTree.getTag().name());
1894 }
1895 } finally {
1896 switchEnv.info.scope.leave();
1897 }
1898 }
1899 // where
1900 private ResultInfo caseLabelResultInfo(Type seltype) {
1901 return new ResultInfo(KindSelector.VAL_TYP,
1902 !seltype.hasTag(ERROR) ? seltype
1903 : Type.noType);
1904 }
1905 /** Add any variables defined in stats to the switch scope. */
1906 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1907 for (;stats.nonEmpty(); stats = stats.tail) {
1908 JCTree stat = stats.head;
1909 if (stat.hasTag(VARDEF))
1910 switchScope.enter(((JCVariableDecl) stat).sym);
1911 }
1912 }
1913 // where
1914 /** Return the selected enumeration constant symbol, or null. */
1915 private Symbol enumConstant(JCTree tree, Type enumType) {
1916 if (tree.hasTag(IDENT)) {
1917 JCIdent ident = (JCIdent)tree;
1918 Name name = ident.name;
1919 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1920 if (sym.kind == VAR) {
1921 Symbol s = ident.sym = sym;
1922 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1923 ident.type = s.type;
1924 return ((s.flags_field & Flags.ENUM) == 0)
1925 ? null : s;
1926 }
1927 }
1928 }
1929 return null;
1930 }
1931
1932 public void visitSynchronized(JCSynchronized tree) {
1933 chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1934 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1935 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1936 }
1937 attribStat(tree.body, env);
1938 result = null;
1939 }
1940 // where
1941 private boolean isValueBased(Type t) {
1942 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1943 }
1944
1945
1946 public void visitTry(JCTry tree) {
1947 // Create a new local environment with a local
1948 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1949 try {
1950 boolean isTryWithResource = tree.resources.nonEmpty();
1951 // Create a nested environment for attributing the try block if needed
1952 Env<AttrContext> tryEnv = isTryWithResource ?
1953 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1954 localEnv;
1955 try {
1956 // Attribute resource declarations
1957 for (JCTree resource : tree.resources) {
1958 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1959 @Override
1960 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1961 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1962 }
1963 };
1964 ResultInfo twrResult =
1965 new ResultInfo(KindSelector.VAR,
1966 syms.autoCloseableType,
1967 twrContext);
1968 if (resource.hasTag(VARDEF)) {
1969 attribStat(resource, tryEnv);
1970 twrResult.check(resource, resource.type);
1971
1972 //check that resource type cannot throw InterruptedException
1973 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1974
1975 VarSymbol var = ((JCVariableDecl) resource).sym;
1976
1977 var.flags_field |= Flags.FINAL;
1978 var.setData(ElementKind.RESOURCE_VARIABLE);
1979 } else {
1980 attribTree(resource, tryEnv, twrResult);
1981 }
1982 }
1983 // Attribute body
1984 attribStat(tree.body, tryEnv);
1985 } finally {
1986 if (isTryWithResource)
1987 tryEnv.info.scope.leave();
1988 }
1989
1990 // Attribute catch clauses
1991 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1992 JCCatch c = l.head;
1993 Env<AttrContext> catchEnv =
1994 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1995 try {
1996 Type ctype = attribStat(c.param, catchEnv);
1997 if (TreeInfo.isMultiCatch(c)) {
1998 //multi-catch parameter is implicitly marked as final
1999 c.param.sym.flags_field |= FINAL | UNION;
2000 }
2001 if (c.param.sym.kind == VAR) {
2002 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2003 }
2004 chk.checkType(c.param.vartype.pos(),
2005 chk.checkClassType(c.param.vartype.pos(), ctype),
2006 syms.throwableType);
2007 attribStat(c.body, catchEnv);
2008 } finally {
2009 catchEnv.info.scope.leave();
2010 }
2011 }
2012
2013 // Attribute finalizer
2014 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2015 result = null;
2016 }
2017 finally {
2018 localEnv.info.scope.leave();
2019 }
2020 }
2021
2022 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2023 if (!resource.isErroneous() &&
2024 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2025 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2026 Symbol close = syms.noSymbol;
2027 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2028 try {
2029 close = rs.resolveQualifiedMethod(pos,
2030 env,
2031 types.skipTypeVars(resource, false),
2032 names.close,
2033 List.nil(),
2034 List.nil());
2035 }
2036 finally {
2037 log.popDiagnosticHandler(discardHandler);
2038 }
2039 if (close.kind == MTH &&
2040 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2041 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2042 env.info.lint.isEnabled(LintCategory.TRY)) {
2043 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2044 }
2045 }
2046 }
2047
2048 public void visitConditional(JCConditional tree) {
2049 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2050 MatchBindings condBindings = matchBindings;
2051
2052 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2053 isBooleanOrNumeric(env, tree)) ?
2054 PolyKind.STANDALONE : PolyKind.POLY;
2055
2056 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2057 //this means we are returning a poly conditional from void-compatible lambda expression
2058 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2059 result = tree.type = types.createErrorType(resultInfo.pt);
2060 return;
2061 }
2062
2063 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2064 unknownExprInfo :
2065 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2066
2067
2068 // x ? y : z
2069 // include x's bindings when true in y
2070 // include x's bindings when false in z
2071
2072 Type truetype;
2073 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2074 try {
2075 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2076 } finally {
2077 trueEnv.info.scope.leave();
2078 }
2079
2080 MatchBindings trueBindings = matchBindings;
2081
2082 Type falsetype;
2083 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2084 try {
2085 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2086 } finally {
2087 falseEnv.info.scope.leave();
2088 }
2089
2090 MatchBindings falseBindings = matchBindings;
2091
2092 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2093 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2094 List.of(truetype, falsetype)) : pt();
2095 if (condtype.constValue() != null &&
2096 truetype.constValue() != null &&
2097 falsetype.constValue() != null &&
2098 !owntype.hasTag(NONE)) {
2099 //constant folding
2100 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2101 }
2102 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2103 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2104 }
2105 //where
2106 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2107 switch (tree.getTag()) {
2108 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2109 ((JCLiteral)tree).typetag == BOOLEAN ||
2110 ((JCLiteral)tree).typetag == BOT;
2111 case LAMBDA: case REFERENCE: return false;
2112 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2113 case CONDEXPR:
2114 JCConditional condTree = (JCConditional)tree;
2115 return isBooleanOrNumeric(env, condTree.truepart) &&
2116 isBooleanOrNumeric(env, condTree.falsepart);
2117 case APPLY:
2118 JCMethodInvocation speculativeMethodTree =
2119 (JCMethodInvocation)deferredAttr.attribSpeculative(
2120 tree, env, unknownExprInfo,
2121 argumentAttr.withLocalCacheContext());
2122 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2123 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2124 env.enclClass.type :
2125 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2126 Type owntype = types.memberType(receiverType, msym).getReturnType();
2127 return primitiveOrBoxed(owntype);
2128 case NEWCLASS:
2129 JCExpression className =
2130 removeClassParams.translate(((JCNewClass)tree).clazz);
2131 JCExpression speculativeNewClassTree =
2132 (JCExpression)deferredAttr.attribSpeculative(
2133 className, env, unknownTypeInfo,
2134 argumentAttr.withLocalCacheContext());
2135 return primitiveOrBoxed(speculativeNewClassTree.type);
2136 default:
2137 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2138 argumentAttr.withLocalCacheContext()).type;
2139 return primitiveOrBoxed(speculativeType);
2140 }
2141 }
2142 //where
2143 boolean primitiveOrBoxed(Type t) {
2144 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2145 }
2146
2147 TreeTranslator removeClassParams = new TreeTranslator() {
2148 @Override
2149 public void visitTypeApply(JCTypeApply tree) {
2150 result = translate(tree.clazz);
2151 }
2152 };
2153
2154 CheckContext conditionalContext(CheckContext checkContext) {
2155 return new Check.NestedCheckContext(checkContext) {
2156 //this will use enclosing check context to check compatibility of
2157 //subexpression against target type; if we are in a method check context,
2158 //depending on whether boxing is allowed, we could have incompatibilities
2159 @Override
2160 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2161 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2162 }
2163 };
2164 }
2165
2166 /** Compute the type of a conditional expression, after
2167 * checking that it exists. See JLS 15.25. Does not take into
2168 * account the special case where condition and both arms
2169 * are constants.
2170 *
2171 * @param pos The source position to be used for error
2172 * diagnostics.
2173 * @param thentype The type of the expression's then-part.
2174 * @param elsetype The type of the expression's else-part.
2175 */
2176 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2177 if (condTypes.isEmpty()) {
2178 return syms.objectType; //TODO: how to handle?
2179 }
2180 Type first = condTypes.head;
2181 // If same type, that is the result
2182 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2183 return first.baseType();
2184
2185 List<Type> unboxedTypes = condTypes.stream()
2186 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2187 .collect(List.collector());
2188
2189 // Otherwise, if both arms can be converted to a numeric
2190 // type, return the least numeric type that fits both arms
2191 // (i.e. return larger of the two, or return int if one
2192 // arm is short, the other is char).
2193 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2194 // If one arm has an integer subrange type (i.e., byte,
2195 // short, or char), and the other is an integer constant
2196 // that fits into the subrange, return the subrange type.
2197 for (Type type : unboxedTypes) {
2198 if (!type.getTag().isStrictSubRangeOf(INT)) {
2199 continue;
2200 }
2201 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2202 return type.baseType();
2203 }
2204
2205 for (TypeTag tag : primitiveTags) {
2206 Type candidate = syms.typeOfTag[tag.ordinal()];
2207 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2208 return candidate;
2209 }
2210 }
2211 }
2212
2213 // Those were all the cases that could result in a primitive
2214 condTypes = condTypes.stream()
2215 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2216 .collect(List.collector());
2217
2218 for (Type type : condTypes) {
2219 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2220 return type.baseType();
2221 }
2222
2223 Iterator<DiagnosticPosition> posIt = positions.iterator();
2224
2225 condTypes = condTypes.stream()
2226 .map(t -> chk.checkNonVoid(posIt.next(), t))
2227 .collect(List.collector());
2228
2229 // both are known to be reference types. The result is
2230 // lub(thentype,elsetype). This cannot fail, as it will
2231 // always be possible to infer "Object" if nothing better.
2232 return types.lub(condTypes.stream()
2233 .map(t -> t.baseType())
2234 .filter(t -> !t.hasTag(BOT))
2235 .collect(List.collector()));
2236 }
2237
2238 static final TypeTag[] primitiveTags = new TypeTag[]{
2239 BYTE,
2240 CHAR,
2241 SHORT,
2242 INT,
2243 LONG,
2244 FLOAT,
2245 DOUBLE,
2246 BOOLEAN,
2247 };
2248
2249 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2250 return bindingEnv(env, env.tree, bindings);
2251 }
2252
2253 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2254 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2255 bindings.forEach(env1.info.scope::enter);
2256 return env1;
2257 }
2258
2259 public void visitIf(JCIf tree) {
2260 attribExpr(tree.cond, env, syms.booleanType);
2261
2262 // if (x) { y } [ else z ]
2263 // include x's bindings when true in y
2264 // include x's bindings when false in z
2265
2266 MatchBindings condBindings = matchBindings;
2267 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2268
2269 try {
2270 attribStat(tree.thenpart, thenEnv);
2271 } finally {
2272 thenEnv.info.scope.leave();
2273 }
2274
2275 preFlow(tree.thenpart);
2276 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2277 boolean aliveAfterElse;
2278
2279 if (tree.elsepart != null) {
2280 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2281 try {
2282 attribStat(tree.elsepart, elseEnv);
2283 } finally {
2284 elseEnv.info.scope.leave();
2285 }
2286 preFlow(tree.elsepart);
2287 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2288 } else {
2289 aliveAfterElse = true;
2290 }
2291
2292 chk.checkEmptyIf(tree);
2293
2294 List<BindingSymbol> afterIfBindings = List.nil();
2295
2296 if (aliveAfterThen && !aliveAfterElse) {
2297 afterIfBindings = condBindings.bindingsWhenTrue;
2298 } else if (aliveAfterElse && !aliveAfterThen) {
2299 afterIfBindings = condBindings.bindingsWhenFalse;
2300 }
2301
2302 addBindings2Scope(tree, afterIfBindings);
2303
2304 result = null;
2305 }
2306
2307 void preFlow(JCTree tree) {
2308 attrRecover.doRecovery();
2309 new PostAttrAnalyzer() {
2310 @Override
2311 public void scan(JCTree tree) {
2312 if (tree == null ||
2313 (tree.type != null &&
2314 tree.type == Type.stuckType)) {
2315 //don't touch stuck expressions!
2316 return;
2317 }
2318 super.scan(tree);
2319 }
2320
2321 @Override
2322 public void visitClassDef(JCClassDecl that) {
2323 if (that.sym != null) {
2324 // Method preFlow shouldn't visit class definitions
2325 // that have not been entered and attributed.
2326 // See JDK-8254557 and JDK-8203277 for more details.
2327 super.visitClassDef(that);
2328 }
2329 }
2330
2331 @Override
2332 public void visitLambda(JCLambda that) {
2333 if (that.type != null) {
2334 // Method preFlow shouldn't visit lambda expressions
2335 // that have not been entered and attributed.
2336 // See JDK-8254557 and JDK-8203277 for more details.
2337 super.visitLambda(that);
2338 }
2339 }
2340 }.scan(tree);
2341 }
2342
2343 public void visitExec(JCExpressionStatement tree) {
2344 //a fresh environment is required for 292 inference to work properly ---
2345 //see Infer.instantiatePolymorphicSignatureInstance()
2346 Env<AttrContext> localEnv = env.dup(tree);
2347 attribExpr(tree.expr, localEnv);
2348 result = null;
2349 }
2350
2351 public void visitBreak(JCBreak tree) {
2352 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2353 result = null;
2354 }
2355
2356 public void visitYield(JCYield tree) {
2357 if (env.info.yieldResult != null) {
2358 attribTree(tree.value, env, env.info.yieldResult);
2359 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2360 } else {
2361 log.error(tree.pos(), tree.value.hasTag(PARENS)
2362 ? Errors.NoSwitchExpressionQualify
2363 : Errors.NoSwitchExpression);
2364 attribTree(tree.value, env, unknownExprInfo);
2365 }
2366 result = null;
2367 }
2368
2369 public void visitContinue(JCContinue tree) {
2370 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2371 result = null;
2372 }
2373 //where
2374 /** Return the target of a break, continue or yield statement,
2375 * if it exists, report an error if not.
2376 * Note: The target of a labelled break or continue is the
2377 * (non-labelled) statement tree referred to by the label,
2378 * not the tree representing the labelled statement itself.
2379 *
2380 * @param pos The position to be used for error diagnostics
2381 * @param tag The tag of the jump statement. This is either
2382 * Tree.BREAK or Tree.CONTINUE.
2383 * @param label The label of the jump statement, or null if no
2384 * label is given.
2385 * @param env The environment current at the jump statement.
2386 */
2387 private JCTree findJumpTarget(DiagnosticPosition pos,
2388 JCTree.Tag tag,
2389 Name label,
2390 Env<AttrContext> env) {
2391 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2392
2393 if (jumpTarget.snd != null) {
2394 log.error(pos, jumpTarget.snd);
2395 }
2396
2397 return jumpTarget.fst;
2398 }
2399 /** Return the target of a break or continue statement, if it exists,
2400 * report an error if not.
2401 * Note: The target of a labelled break or continue is the
2402 * (non-labelled) statement tree referred to by the label,
2403 * not the tree representing the labelled statement itself.
2404 *
2405 * @param tag The tag of the jump statement. This is either
2406 * Tree.BREAK or Tree.CONTINUE.
2407 * @param label The label of the jump statement, or null if no
2408 * label is given.
2409 * @param env The environment current at the jump statement.
2410 */
2411 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2412 Name label,
2413 Env<AttrContext> env) {
2414 // Search environments outwards from the point of jump.
2415 Env<AttrContext> env1 = env;
2416 JCDiagnostic.Error pendingError = null;
2417 LOOP:
2418 while (env1 != null) {
2419 switch (env1.tree.getTag()) {
2420 case LABELLED:
2421 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2422 if (label == labelled.label) {
2423 // If jump is a continue, check that target is a loop.
2424 if (tag == CONTINUE) {
2425 if (!labelled.body.hasTag(DOLOOP) &&
2426 !labelled.body.hasTag(WHILELOOP) &&
2427 !labelled.body.hasTag(FORLOOP) &&
2428 !labelled.body.hasTag(FOREACHLOOP)) {
2429 pendingError = Errors.NotLoopLabel(label);
2430 }
2431 // Found labelled statement target, now go inwards
2432 // to next non-labelled tree.
2433 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2434 } else {
2435 return Pair.of(labelled, pendingError);
2436 }
2437 }
2438 break;
2439 case DOLOOP:
2440 case WHILELOOP:
2441 case FORLOOP:
2442 case FOREACHLOOP:
2443 if (label == null) return Pair.of(env1.tree, pendingError);
2444 break;
2445 case SWITCH:
2446 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2447 break;
2448 case SWITCH_EXPRESSION:
2449 if (tag == YIELD) {
2450 return Pair.of(env1.tree, null);
2451 } else if (tag == BREAK) {
2452 pendingError = Errors.BreakOutsideSwitchExpression;
2453 } else {
2454 pendingError = Errors.ContinueOutsideSwitchExpression;
2455 }
2456 break;
2457 case LAMBDA:
2458 case METHODDEF:
2459 case CLASSDEF:
2460 break LOOP;
2461 default:
2462 }
2463 env1 = env1.next;
2464 }
2465 if (label != null)
2466 return Pair.of(null, Errors.UndefLabel(label));
2467 else if (pendingError != null)
2468 return Pair.of(null, pendingError);
2469 else if (tag == CONTINUE)
2470 return Pair.of(null, Errors.ContOutsideLoop);
2471 else
2472 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2473 }
2474
2475 public void visitReturn(JCReturn tree) {
2476 // Check that there is an enclosing method which is
2477 // nested within than the enclosing class.
2478 if (env.info.returnResult == null) {
2479 log.error(tree.pos(), Errors.RetOutsideMeth);
2480 } else if (env.info.yieldResult != null) {
2481 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2482 } else if (!env.info.isLambda &&
2483 !env.info.isNewClass &&
2484 env.enclMethod != null &&
2485 TreeInfo.isCompactConstructor(env.enclMethod)) {
2486 log.error(env.enclMethod,
2487 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2488 } else {
2489 // Attribute return expression, if it exists, and check that
2490 // it conforms to result type of enclosing method.
2491 if (tree.expr != null) {
2492 if (env.info.returnResult.pt.hasTag(VOID)) {
2493 env.info.returnResult.checkContext.report(tree.expr.pos(),
2494 diags.fragment(Fragments.UnexpectedRetVal));
2495 }
2496 attribTree(tree.expr, env, env.info.returnResult);
2497 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2498 !env.info.returnResult.pt.hasTag(NONE)) {
2499 env.info.returnResult.checkContext.report(tree.pos(),
2500 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2501 }
2502 }
2503 result = null;
2504 }
2505
2506 public void visitThrow(JCThrow tree) {
2507 Type owntype = attribExpr(tree.expr, env, Type.noType);
2508 chk.checkType(tree, owntype, syms.throwableType);
2509 result = null;
2510 }
2511
2512 public void visitAssert(JCAssert tree) {
2513 attribExpr(tree.cond, env, syms.booleanType);
2514 if (tree.detail != null) {
2515 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2516 }
2517 result = null;
2518 }
2519
2520 /** Visitor method for method invocations.
2521 * NOTE: The method part of an application will have in its type field
2522 * the return type of the method, not the method's type itself!
2523 */
2524 public void visitApply(JCMethodInvocation tree) {
2525 // The local environment of a method application is
2526 // a new environment nested in the current one.
2527 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2528
2529 // The types of the actual method arguments.
2530 List<Type> argtypes;
2531
2532 // The types of the actual method type arguments.
2533 List<Type> typeargtypes = null;
2534
2535 Name methName = TreeInfo.name(tree.meth);
2536
2537 boolean isConstructorCall =
2538 methName == names._this || methName == names._super;
2539
2540 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2541 if (isConstructorCall) {
2542
2543 // Attribute arguments, yielding list of argument types.
2544 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2545 argtypes = argtypesBuf.toList();
2546 typeargtypes = attribTypes(tree.typeargs, localEnv);
2547
2548 // Done with this()/super() parameters. End of constructor prologue.
2549 env.info.ctorPrologue = false;
2550
2551 // Variable `site' points to the class in which the called
2552 // constructor is defined.
2553 Type site = env.enclClass.sym.type;
2554 if (methName == names._super) {
2555 if (site == syms.objectType) {
2556 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2557 site = types.createErrorType(syms.objectType);
2558 } else {
2559 site = types.supertype(site);
2560 }
2561 }
2562
2563 if (site.hasTag(CLASS)) {
2564 Type encl = site.getEnclosingType();
2565 while (encl != null && encl.hasTag(TYPEVAR))
2566 encl = encl.getUpperBound();
2567 if (encl.hasTag(CLASS)) {
2568 // we are calling a nested class
2569
2570 if (tree.meth.hasTag(SELECT)) {
2571 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2572
2573 // We are seeing a prefixed call, of the form
2574 // <expr>.super(...).
2575 // Check that the prefix expression conforms
2576 // to the outer instance type of the class.
2577 chk.checkRefType(qualifier.pos(),
2578 attribExpr(qualifier, localEnv,
2579 encl));
2580 } else if (methName == names._super) {
2581 // qualifier omitted; check for existence
2582 // of an appropriate implicit qualifier.
2583 rs.resolveImplicitThis(tree.meth.pos(),
2584 localEnv, site, true);
2585 }
2586 } else if (tree.meth.hasTag(SELECT)) {
2587 log.error(tree.meth.pos(),
2588 Errors.IllegalQualNotIcls(site.tsym));
2589 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2590 }
2591
2592 // if we're calling a java.lang.Enum constructor,
2593 // prefix the implicit String and int parameters
2594 if (site.tsym == syms.enumSym)
2595 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2596
2597 // Resolve the called constructor under the assumption
2598 // that we are referring to a superclass instance of the
2599 // current instance (JLS ???).
2600 boolean selectSuperPrev = localEnv.info.selectSuper;
2601 localEnv.info.selectSuper = true;
2602 localEnv.info.pendingResolutionPhase = null;
2603 Symbol sym = rs.resolveConstructor(
2604 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2605 localEnv.info.selectSuper = selectSuperPrev;
2606
2607 // Set method symbol to resolved constructor...
2608 TreeInfo.setSymbol(tree.meth, sym);
2609
2610 // ...and check that it is legal in the current context.
2611 // (this will also set the tree's type)
2612 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2613 checkId(tree.meth, site, sym, localEnv,
2614 new ResultInfo(kind, mpt));
2615 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2616 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2617 }
2618 // Otherwise, `site' is an error type and we do nothing
2619 result = tree.type = syms.voidType;
2620 } else {
2621 // Otherwise, we are seeing a regular method call.
2622 // Attribute the arguments, yielding list of argument types, ...
2623 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2624 argtypes = argtypesBuf.toList();
2625 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2626
2627 // ... and attribute the method using as a prototype a methodtype
2628 // whose formal argument types is exactly the list of actual
2629 // arguments (this will also set the method symbol).
2630 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2631 localEnv.info.pendingResolutionPhase = null;
2632 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2633
2634 // Compute the result type.
2635 Type restype = mtype.getReturnType();
2636 if (restype.hasTag(WILDCARD))
2637 throw new AssertionError(mtype);
2638
2639 Type qualifier = (tree.meth.hasTag(SELECT))
2640 ? ((JCFieldAccess) tree.meth).selected.type
2641 : env.enclClass.sym.type;
2642 Symbol msym = TreeInfo.symbol(tree.meth);
2643 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2644
2645 chk.checkRefTypes(tree.typeargs, typeargtypes);
2646
2647 // Check that value of resulting type is admissible in the
2648 // current context. Also, capture the return type
2649 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2650 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2651 }
2652 chk.validate(tree.typeargs, localEnv);
2653 }
2654 //where
2655 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2656 if (msym != null &&
2657 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2658 methodName == names.getClass &&
2659 argtypes.isEmpty()) {
2660 // as a special case, x.getClass() has type Class<? extends |X|>
2661 return new ClassType(restype.getEnclosingType(),
2662 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2663 BoundKind.EXTENDS,
2664 syms.boundClass)),
2665 restype.tsym,
2666 restype.getMetadata());
2667 } else if (msym != null &&
2668 msym.owner == syms.arrayClass &&
2669 methodName == names.clone &&
2670 types.isArray(qualifierType)) {
2671 // as a special case, array.clone() has a result that is
2672 // the same as static type of the array being cloned
2673 return qualifierType;
2674 } else {
2675 return restype;
2676 }
2677 }
2678
2679 /** Obtain a method type with given argument types.
2680 */
2681 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2682 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2683 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2684 }
2685
2686 public void visitNewClass(final JCNewClass tree) {
2687 Type owntype = types.createErrorType(tree.type);
2688
2689 // The local environment of a class creation is
2690 // a new environment nested in the current one.
2691 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2692
2693 // The anonymous inner class definition of the new expression,
2694 // if one is defined by it.
2695 JCClassDecl cdef = tree.def;
2696
2697 // If enclosing class is given, attribute it, and
2698 // complete class name to be fully qualified
2699 JCExpression clazz = tree.clazz; // Class field following new
2700 JCExpression clazzid; // Identifier in class field
2701 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2702 annoclazzid = null;
2703
2704 if (clazz.hasTag(TYPEAPPLY)) {
2705 clazzid = ((JCTypeApply) clazz).clazz;
2706 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2707 annoclazzid = (JCAnnotatedType) clazzid;
2708 clazzid = annoclazzid.underlyingType;
2709 }
2710 } else {
2711 if (clazz.hasTag(ANNOTATED_TYPE)) {
2712 annoclazzid = (JCAnnotatedType) clazz;
2713 clazzid = annoclazzid.underlyingType;
2714 } else {
2715 clazzid = clazz;
2716 }
2717 }
2718
2719 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2720
2721 if (tree.encl != null) {
2722 // We are seeing a qualified new, of the form
2723 // <expr>.new C <...> (...) ...
2724 // In this case, we let clazz stand for the name of the
2725 // allocated class C prefixed with the type of the qualifier
2726 // expression, so that we can
2727 // resolve it with standard techniques later. I.e., if
2728 // <expr> has type T, then <expr>.new C <...> (...)
2729 // yields a clazz T.C.
2730 Type encltype = chk.checkRefType(tree.encl.pos(),
2731 attribExpr(tree.encl, env));
2732 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2733 // from expr to the combined type, or not? Yes, do this.
2734 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2735 ((JCIdent) clazzid).name);
2736
2737 EndPosTable endPosTable = this.env.toplevel.endPositions;
2738 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2739 if (clazz.hasTag(ANNOTATED_TYPE)) {
2740 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2741 List<JCAnnotation> annos = annoType.annotations;
2742
2743 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2744 clazzid1 = make.at(tree.pos).
2745 TypeApply(clazzid1,
2746 ((JCTypeApply) clazz).arguments);
2747 }
2748
2749 clazzid1 = make.at(tree.pos).
2750 AnnotatedType(annos, clazzid1);
2751 } else if (clazz.hasTag(TYPEAPPLY)) {
2752 clazzid1 = make.at(tree.pos).
2753 TypeApply(clazzid1,
2754 ((JCTypeApply) clazz).arguments);
2755 }
2756
2757 clazz = clazzid1;
2758 }
2759
2760 // Attribute clazz expression and store
2761 // symbol + type back into the attributed tree.
2762 Type clazztype;
2763
2764 try {
2765 env.info.isNewClass = true;
2766 clazztype = TreeInfo.isEnumInit(env.tree) ?
2767 attribIdentAsEnumType(env, (JCIdent)clazz) :
2768 attribType(clazz, env);
2769 } finally {
2770 env.info.isNewClass = false;
2771 }
2772
2773 clazztype = chk.checkDiamond(tree, clazztype);
2774 chk.validate(clazz, localEnv);
2775 if (tree.encl != null) {
2776 // We have to work in this case to store
2777 // symbol + type back into the attributed tree.
2778 tree.clazz.type = clazztype;
2779 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2780 clazzid.type = ((JCIdent) clazzid).sym.type;
2781 if (annoclazzid != null) {
2782 annoclazzid.type = clazzid.type;
2783 }
2784 if (!clazztype.isErroneous()) {
2785 if (cdef != null && clazztype.tsym.isInterface()) {
2786 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2787 } else if (clazztype.tsym.isStatic()) {
2788 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2789 }
2790 }
2791 } else if (!clazztype.tsym.isInterface() &&
2792 clazztype.getEnclosingType().hasTag(CLASS)) {
2793 // Check for the existence of an apropos outer instance
2794 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2795 }
2796
2797 // Attribute constructor arguments.
2798 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2799 final KindSelector pkind =
2800 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2801 List<Type> argtypes = argtypesBuf.toList();
2802 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2803
2804 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2805 // Enums may not be instantiated except implicitly
2806 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2807 (!env.tree.hasTag(VARDEF) ||
2808 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2809 ((JCVariableDecl) env.tree).init != tree))
2810 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2811
2812 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2813 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2814 boolean skipNonDiamondPath = false;
2815 // Check that class is not abstract
2816 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2817 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2818 log.error(tree.pos(),
2819 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2820 skipNonDiamondPath = true;
2821 } else if (cdef != null && clazztype.tsym.isInterface()) {
2822 // Check that no constructor arguments are given to
2823 // anonymous classes implementing an interface
2824 if (!argtypes.isEmpty())
2825 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2826
2827 if (!typeargtypes.isEmpty())
2828 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2829
2830 // Error recovery: pretend no arguments were supplied.
2831 argtypes = List.nil();
2832 typeargtypes = List.nil();
2833 skipNonDiamondPath = true;
2834 }
2835 if (TreeInfo.isDiamond(tree)) {
2836 ClassType site = new ClassType(clazztype.getEnclosingType(),
2837 clazztype.tsym.type.getTypeArguments(),
2838 clazztype.tsym,
2839 clazztype.getMetadata());
2840
2841 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2842 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2843 diamondEnv.info.pendingResolutionPhase = null;
2844
2845 //if the type of the instance creation expression is a class type
2846 //apply method resolution inference (JLS 15.12.2.7). The return type
2847 //of the resolved constructor will be a partially instantiated type
2848 Symbol constructor = rs.resolveDiamond(tree.pos(),
2849 diamondEnv,
2850 site,
2851 argtypes,
2852 typeargtypes);
2853 tree.constructor = constructor.baseSymbol();
2854
2855 final TypeSymbol csym = clazztype.tsym;
2856 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2857 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2858 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2859 constructorType = checkId(tree, site,
2860 constructor,
2861 diamondEnv,
2862 diamondResult);
2863
2864 tree.clazz.type = types.createErrorType(clazztype);
2865 if (!constructorType.isErroneous()) {
2866 tree.clazz.type = clazz.type = constructorType.getReturnType();
2867 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2868 }
2869 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2870 }
2871
2872 // Resolve the called constructor under the assumption
2873 // that we are referring to a superclass instance of the
2874 // current instance (JLS ???).
2875 else if (!skipNonDiamondPath) {
2876 //the following code alters some of the fields in the current
2877 //AttrContext - hence, the current context must be dup'ed in
2878 //order to avoid downstream failures
2879 Env<AttrContext> rsEnv = localEnv.dup(tree);
2880 rsEnv.info.selectSuper = cdef != null;
2881 rsEnv.info.pendingResolutionPhase = null;
2882 tree.constructor = rs.resolveConstructor(
2883 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2884 if (cdef == null) { //do not check twice!
2885 tree.constructorType = checkId(tree,
2886 clazztype,
2887 tree.constructor,
2888 rsEnv,
2889 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2890 if (rsEnv.info.lastResolveVarargs())
2891 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2892 }
2893 }
2894
2895 if (cdef != null) {
2896 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2897 return;
2898 }
2899
2900 if (tree.constructor != null && tree.constructor.kind == MTH)
2901 owntype = clazztype;
2902 }
2903 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2904 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2905 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2906 //we need to wait for inference to finish and then replace inference vars in the constructor type
2907 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2908 instantiatedContext -> {
2909 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2910 });
2911 }
2912 chk.validate(tree.typeargs, localEnv);
2913 }
2914
2915 // where
2916 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2917 JCClassDecl cdef, Env<AttrContext> localEnv,
2918 List<Type> argtypes, List<Type> typeargtypes,
2919 KindSelector pkind) {
2920 // We are seeing an anonymous class instance creation.
2921 // In this case, the class instance creation
2922 // expression
2923 //
2924 // E.new <typeargs1>C<typargs2>(args) { ... }
2925 //
2926 // is represented internally as
2927 //
2928 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2929 //
2930 // This expression is then *transformed* as follows:
2931 //
2932 // (1) add an extends or implements clause
2933 // (2) add a constructor.
2934 //
2935 // For instance, if C is a class, and ET is the type of E,
2936 // the expression
2937 //
2938 // E.new <typeargs1>C<typargs2>(args) { ... }
2939 //
2940 // is translated to (where X is a fresh name and typarams is the
2941 // parameter list of the super constructor):
2942 //
2943 // new <typeargs1>X(<*nullchk*>E, args) where
2944 // X extends C<typargs2> {
2945 // <typarams> X(ET e, args) {
2946 // e.<typeargs1>super(args)
2947 // }
2948 // ...
2949 // }
2950 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2951 Type enclType = clazztype.getEnclosingType();
2952 if (enclType != null &&
2953 enclType.hasTag(CLASS) &&
2954 !chk.checkDenotable((ClassType)enclType)) {
2955 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2956 }
2957 final boolean isDiamond = TreeInfo.isDiamond(tree);
2958 if (isDiamond
2959 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2960 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2961 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2962 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2963 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2964 instantiatedContext -> {
2965 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2966 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2967 ResultInfo prevResult = this.resultInfo;
2968 try {
2969 this.resultInfo = resultInfoForClassDefinition;
2970 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2971 dupLocalEnv, argtypes, typeargtypes, pkind);
2972 } finally {
2973 this.resultInfo = prevResult;
2974 }
2975 });
2976 } else {
2977 if (isDiamond && clazztype.hasTag(CLASS)) {
2978 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2979 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2980 // One or more types inferred in the previous steps is non-denotable.
2981 Fragment fragment = Diamond(clazztype.tsym);
2982 log.error(tree.clazz.pos(),
2983 Errors.CantApplyDiamond1(
2984 fragment,
2985 invalidDiamondArgs.size() > 1 ?
2986 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2987 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2988 }
2989 // For <>(){}, inferred types must also be accessible.
2990 for (Type t : clazztype.getTypeArguments()) {
2991 rs.checkAccessibleType(env, t);
2992 }
2993 }
2994
2995 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2996 // false for isInterface call even when the original type is an interface.
2997 boolean implementing = clazztype.tsym.isInterface() ||
2998 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2999 clazztype.getOriginalType().tsym.isInterface();
3000
3001 if (implementing) {
3002 cdef.implementing = List.of(clazz);
3003 } else {
3004 cdef.extending = clazz;
3005 }
3006
3007 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3008 rs.isSerializable(clazztype)) {
3009 localEnv.info.isSerializable = true;
3010 }
3011
3012 attribStat(cdef, localEnv);
3013
3014 List<Type> finalargtypes;
3015 // If an outer instance is given,
3016 // prefix it to the constructor arguments
3017 // and delete it from the new expression
3018 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3019 finalargtypes = argtypes.prepend(tree.encl.type);
3020 } else {
3021 finalargtypes = argtypes;
3022 }
3023
3024 // Reassign clazztype and recompute constructor. As this necessarily involves
3025 // another attribution pass for deferred types in the case of <>, replicate
3026 // them. Original arguments have right decorations already.
3027 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3028 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3029 }
3030
3031 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3032 : cdef.sym.type;
3033 Symbol sym = tree.constructor = rs.resolveConstructor(
3034 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3035 Assert.check(!sym.kind.isResolutionError());
3036 tree.constructor = sym;
3037 tree.constructorType = checkId(tree,
3038 clazztype,
3039 tree.constructor,
3040 localEnv,
3041 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3042 }
3043 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3044 clazztype : types.createErrorType(tree.type);
3045 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3046 chk.validate(tree.typeargs, localEnv);
3047 }
3048
3049 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3050 return new Check.NestedCheckContext(checkContext) {
3051 @Override
3052 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3053 enclosingContext.report(clazz.clazz,
3054 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3055 }
3056 };
3057 }
3058
3059 /** Make an attributed null check tree.
3060 */
3061 public JCExpression makeNullCheck(JCExpression arg) {
3062 // optimization: new Outer() can never be null; skip null check
3063 if (arg.getTag() == NEWCLASS)
3064 return arg;
3065 // optimization: X.this is never null; skip null check
3066 Name name = TreeInfo.name(arg);
3067 if (name == names._this || name == names._super) return arg;
3068
3069 JCTree.Tag optag = NULLCHK;
3070 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3071 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3072 tree.type = arg.type;
3073 return tree;
3074 }
3075
3076 public void visitNewArray(JCNewArray tree) {
3077 Type owntype = types.createErrorType(tree.type);
3078 Env<AttrContext> localEnv = env.dup(tree);
3079 Type elemtype;
3080 if (tree.elemtype != null) {
3081 elemtype = attribType(tree.elemtype, localEnv);
3082 chk.validate(tree.elemtype, localEnv);
3083 owntype = elemtype;
3084 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3085 attribExpr(l.head, localEnv, syms.intType);
3086 owntype = new ArrayType(owntype, syms.arrayClass);
3087 }
3088 } else {
3089 // we are seeing an untyped aggregate { ... }
3090 // this is allowed only if the prototype is an array
3091 if (pt().hasTag(ARRAY)) {
3092 elemtype = types.elemtype(pt());
3093 } else {
3094 if (!pt().hasTag(ERROR) &&
3095 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3096 log.error(tree.pos(),
3097 Errors.IllegalInitializerForType(pt()));
3098 }
3099 elemtype = types.createErrorType(pt());
3100 }
3101 }
3102 if (tree.elems != null) {
3103 attribExprs(tree.elems, localEnv, elemtype);
3104 owntype = new ArrayType(elemtype, syms.arrayClass);
3105 }
3106 if (!types.isReifiable(elemtype))
3107 log.error(tree.pos(), Errors.GenericArrayCreation);
3108 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3109 }
3110
3111 /*
3112 * A lambda expression can only be attributed when a target-type is available.
3113 * In addition, if the target-type is that of a functional interface whose
3114 * descriptor contains inference variables in argument position the lambda expression
3115 * is 'stuck' (see DeferredAttr).
3116 */
3117 @Override
3118 public void visitLambda(final JCLambda that) {
3119 boolean wrongContext = false;
3120 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3121 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3122 //lambda only allowed in assignment or method invocation/cast context
3123 log.error(that.pos(), Errors.UnexpectedLambda);
3124 }
3125 resultInfo = recoveryInfo;
3126 wrongContext = true;
3127 }
3128 //create an environment for attribution of the lambda expression
3129 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3130 boolean needsRecovery =
3131 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3132 try {
3133 if (needsRecovery && rs.isSerializable(pt())) {
3134 localEnv.info.isSerializable = true;
3135 localEnv.info.isSerializableLambda = true;
3136 }
3137 List<Type> explicitParamTypes = null;
3138 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3139 //attribute lambda parameters
3140 attribStats(that.params, localEnv);
3141 explicitParamTypes = TreeInfo.types(that.params);
3142 }
3143
3144 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3145 Type currentTarget = targetInfo.target;
3146 Type lambdaType = targetInfo.descriptor;
3147
3148 if (currentTarget.isErroneous()) {
3149 result = that.type = currentTarget;
3150 return;
3151 }
3152
3153 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3154
3155 if (lambdaType.hasTag(FORALL)) {
3156 //lambda expression target desc cannot be a generic method
3157 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3158 kindName(currentTarget.tsym),
3159 currentTarget.tsym);
3160 resultInfo.checkContext.report(that, diags.fragment(msg));
3161 result = that.type = types.createErrorType(pt());
3162 return;
3163 }
3164
3165 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3166 //add param type info in the AST
3167 List<Type> actuals = lambdaType.getParameterTypes();
3168 List<JCVariableDecl> params = that.params;
3169
3170 boolean arityMismatch = false;
3171
3172 while (params.nonEmpty()) {
3173 if (actuals.isEmpty()) {
3174 //not enough actuals to perform lambda parameter inference
3175 arityMismatch = true;
3176 }
3177 //reset previously set info
3178 Type argType = arityMismatch ?
3179 syms.errType :
3180 actuals.head;
3181 if (params.head.isImplicitlyTyped()) {
3182 setSyntheticVariableType(params.head, argType);
3183 }
3184 params.head.sym = null;
3185 actuals = actuals.isEmpty() ?
3186 actuals :
3187 actuals.tail;
3188 params = params.tail;
3189 }
3190
3191 //attribute lambda parameters
3192 attribStats(that.params, localEnv);
3193
3194 if (arityMismatch) {
3195 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3196 result = that.type = types.createErrorType(currentTarget);
3197 return;
3198 }
3199 }
3200
3201 //from this point on, no recovery is needed; if we are in assignment context
3202 //we will be able to attribute the whole lambda body, regardless of errors;
3203 //if we are in a 'check' method context, and the lambda is not compatible
3204 //with the target-type, it will be recovered anyway in Attr.checkId
3205 needsRecovery = false;
3206
3207 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3208 lambdaBodyResult(that, lambdaType, resultInfo);
3209
3210 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3211 attribTree(that.getBody(), localEnv, bodyResultInfo);
3212 } else {
3213 JCBlock body = (JCBlock)that.body;
3214 if (body == breakTree &&
3215 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3216 breakTreeFound(copyEnv(localEnv));
3217 }
3218 attribStats(body.stats, localEnv);
3219 }
3220
3221 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3222
3223 boolean isSpeculativeRound =
3224 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3225
3226 preFlow(that);
3227 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3228
3229 that.type = currentTarget; //avoids recovery at this stage
3230 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3231
3232 if (!isSpeculativeRound) {
3233 //add thrown types as bounds to the thrown types free variables if needed:
3234 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3235 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3236 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3237 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3238 }
3239 }
3240
3241 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3242 }
3243 result = wrongContext ? that.type = types.createErrorType(pt())
3244 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3245 } catch (Types.FunctionDescriptorLookupError ex) {
3246 JCDiagnostic cause = ex.getDiagnostic();
3247 resultInfo.checkContext.report(that, cause);
3248 result = that.type = types.createErrorType(pt());
3249 return;
3250 } catch (CompletionFailure cf) {
3251 chk.completionError(that.pos(), cf);
3252 } catch (Throwable t) {
3253 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3254 //as that would likely cause the same exception again.
3255 needsRecovery = false;
3256 throw t;
3257 } finally {
3258 localEnv.info.scope.leave();
3259 if (needsRecovery) {
3260 Type prevResult = result;
3261 try {
3262 attribTree(that, env, recoveryInfo);
3263 } finally {
3264 if (result == Type.recoveryType) {
3265 result = prevResult;
3266 }
3267 }
3268 }
3269 }
3270 }
3271 //where
3272 class TargetInfo {
3273 Type target;
3274 Type descriptor;
3275
3276 public TargetInfo(Type target, Type descriptor) {
3277 this.target = target;
3278 this.descriptor = descriptor;
3279 }
3280 }
3281
3282 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3283 Type lambdaType;
3284 Type currentTarget = resultInfo.pt;
3285 if (resultInfo.pt != Type.recoveryType) {
3286 /* We need to adjust the target. If the target is an
3287 * intersection type, for example: SAM & I1 & I2 ...
3288 * the target will be updated to SAM
3289 */
3290 currentTarget = targetChecker.visit(currentTarget, that);
3291 if (!currentTarget.isIntersection()) {
3292 if (explicitParamTypes != null) {
3293 currentTarget = infer.instantiateFunctionalInterface(that,
3294 currentTarget, explicitParamTypes, resultInfo.checkContext);
3295 }
3296 currentTarget = types.removeWildcards(currentTarget);
3297 lambdaType = types.findDescriptorType(currentTarget);
3298 } else {
3299 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3300 ListBuffer<Type> components = new ListBuffer<>();
3301 for (Type bound : ict.getExplicitComponents()) {
3302 if (explicitParamTypes != null) {
3303 try {
3304 bound = infer.instantiateFunctionalInterface(that,
3305 bound, explicitParamTypes, resultInfo.checkContext);
3306 } catch (FunctionDescriptorLookupError t) {
3307 // do nothing
3308 }
3309 }
3310 bound = types.removeWildcards(bound);
3311 components.add(bound);
3312 }
3313 currentTarget = types.makeIntersectionType(components.toList());
3314 currentTarget.tsym.flags_field |= INTERFACE;
3315 lambdaType = types.findDescriptorType(currentTarget);
3316 }
3317
3318 } else {
3319 currentTarget = Type.recoveryType;
3320 lambdaType = fallbackDescriptorType(that);
3321 }
3322 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3323 //lambda expression target desc cannot be a generic method
3324 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3325 kindName(currentTarget.tsym),
3326 currentTarget.tsym);
3327 resultInfo.checkContext.report(that, diags.fragment(msg));
3328 currentTarget = types.createErrorType(pt());
3329 }
3330 return new TargetInfo(currentTarget, lambdaType);
3331 }
3332
3333 void preFlow(JCLambda tree) {
3334 attrRecover.doRecovery();
3335 new PostAttrAnalyzer() {
3336 @Override
3337 public void scan(JCTree tree) {
3338 if (tree == null ||
3339 (tree.type != null &&
3340 tree.type == Type.stuckType)) {
3341 //don't touch stuck expressions!
3342 return;
3343 }
3344 super.scan(tree);
3345 }
3346
3347 @Override
3348 public void visitClassDef(JCClassDecl that) {
3349 // or class declaration trees!
3350 }
3351
3352 public void visitLambda(JCLambda that) {
3353 // or lambda expressions!
3354 }
3355 }.scan(tree.body);
3356 }
3357
3358 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3359
3360 @Override
3361 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3362 return t.isIntersection() ?
3363 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3364 }
3365
3366 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3367 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3368 return ict;
3369 }
3370
3371 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3372 ListBuffer<Type> targs = new ListBuffer<>();
3373 ListBuffer<Type> supertypes = new ListBuffer<>();
3374 for (Type i : ict.interfaces_field) {
3375 if (i.isParameterized()) {
3376 targs.appendList(i.tsym.type.allparams());
3377 }
3378 supertypes.append(i.tsym.type);
3379 }
3380 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3381 notionalIntf.allparams_field = targs.toList();
3382 notionalIntf.tsym.flags_field |= INTERFACE;
3383 return notionalIntf.tsym;
3384 }
3385 };
3386
3387 private Type fallbackDescriptorType(JCExpression tree) {
3388 switch (tree.getTag()) {
3389 case LAMBDA:
3390 JCLambda lambda = (JCLambda)tree;
3391 List<Type> argtypes = List.nil();
3392 for (JCVariableDecl param : lambda.params) {
3393 argtypes = param.vartype != null && param.vartype.type != null ?
3394 argtypes.append(param.vartype.type) :
3395 argtypes.append(syms.errType);
3396 }
3397 return new MethodType(argtypes, Type.recoveryType,
3398 List.of(syms.throwableType), syms.methodClass);
3399 case REFERENCE:
3400 return new MethodType(List.nil(), Type.recoveryType,
3401 List.of(syms.throwableType), syms.methodClass);
3402 default:
3403 Assert.error("Cannot get here!");
3404 }
3405 return null;
3406 }
3407
3408 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3409 final InferenceContext inferenceContext, final Type... ts) {
3410 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3411 }
3412
3413 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3414 final InferenceContext inferenceContext, final List<Type> ts) {
3415 if (inferenceContext.free(ts)) {
3416 inferenceContext.addFreeTypeListener(ts,
3417 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3418 } else {
3419 for (Type t : ts) {
3420 rs.checkAccessibleType(env, t);
3421 }
3422 }
3423 }
3424
3425 /**
3426 * Lambda/method reference have a special check context that ensures
3427 * that i.e. a lambda return type is compatible with the expected
3428 * type according to both the inherited context and the assignment
3429 * context.
3430 */
3431 class FunctionalReturnContext extends Check.NestedCheckContext {
3432
3433 FunctionalReturnContext(CheckContext enclosingContext) {
3434 super(enclosingContext);
3435 }
3436
3437 @Override
3438 public boolean compatible(Type found, Type req, Warner warn) {
3439 //return type must be compatible in both current context and assignment context
3440 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3441 }
3442
3443 @Override
3444 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3445 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3446 }
3447 }
3448
3449 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3450
3451 JCExpression expr;
3452 boolean expStmtExpected;
3453
3454 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3455 super(enclosingContext);
3456 this.expr = expr;
3457 }
3458
3459 @Override
3460 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3461 if (expStmtExpected) {
3462 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3463 } else {
3464 super.report(pos, details);
3465 }
3466 }
3467
3468 @Override
3469 public boolean compatible(Type found, Type req, Warner warn) {
3470 //a void return is compatible with an expression statement lambda
3471 if (req.hasTag(VOID)) {
3472 expStmtExpected = true;
3473 return TreeInfo.isExpressionStatement(expr);
3474 } else {
3475 return super.compatible(found, req, warn);
3476 }
3477 }
3478 }
3479
3480 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3481 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3482 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3483 new FunctionalReturnContext(resultInfo.checkContext);
3484
3485 return descriptor.getReturnType() == Type.recoveryType ?
3486 recoveryInfo :
3487 new ResultInfo(KindSelector.VAL,
3488 descriptor.getReturnType(), funcContext);
3489 }
3490
3491 /**
3492 * Lambda compatibility. Check that given return types, thrown types, parameter types
3493 * are compatible with the expected functional interface descriptor. This means that:
3494 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3495 * types must be compatible with the return type of the expected descriptor.
3496 */
3497 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3498 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3499
3500 //return values have already been checked - but if lambda has no return
3501 //values, we must ensure that void/value compatibility is correct;
3502 //this amounts at checking that, if a lambda body can complete normally,
3503 //the descriptor's return type must be void
3504 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3505 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3506 Fragment msg =
3507 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3508 checkContext.report(tree,
3509 diags.fragment(msg));
3510 }
3511
3512 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3513 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3514 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3515 }
3516 }
3517
3518 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3519 * static field and that lambda has type annotations, these annotations will
3520 * also be stored at these fake clinit methods.
3521 *
3522 * LambdaToMethod also use fake clinit methods so they can be reused.
3523 * Also as LTM is a phase subsequent to attribution, the methods from
3524 * clinits can be safely removed by LTM to save memory.
3525 */
3526 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3527
3528 public MethodSymbol removeClinit(ClassSymbol sym) {
3529 return clinits.remove(sym);
3530 }
3531
3532 /* This method returns an environment to be used to attribute a lambda
3533 * expression.
3534 *
3535 * The owner of this environment is a method symbol. If the current owner
3536 * is not a method, for example if the lambda is used to initialize
3537 * a field, then if the field is:
3538 *
3539 * - an instance field, we use the first constructor.
3540 * - a static field, we create a fake clinit method.
3541 */
3542 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3543 Env<AttrContext> lambdaEnv;
3544 Symbol owner = env.info.scope.owner;
3545 if (owner.kind == VAR && owner.owner.kind == TYP) {
3546 //field initializer
3547 ClassSymbol enclClass = owner.enclClass();
3548 Symbol newScopeOwner = env.info.scope.owner;
3549 /* if the field isn't static, then we can get the first constructor
3550 * and use it as the owner of the environment. This is what
3551 * LTM code is doing to look for type annotations so we are fine.
3552 */
3553 if ((owner.flags() & STATIC) == 0) {
3554 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3555 newScopeOwner = s;
3556 break;
3557 }
3558 } else {
3559 /* if the field is static then we need to create a fake clinit
3560 * method, this method can later be reused by LTM.
3561 */
3562 MethodSymbol clinit = clinits.get(enclClass);
3563 if (clinit == null) {
3564 Type clinitType = new MethodType(List.nil(),
3565 syms.voidType, List.nil(), syms.methodClass);
3566 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3567 names.clinit, clinitType, enclClass);
3568 clinit.params = List.nil();
3569 clinits.put(enclClass, clinit);
3570 }
3571 newScopeOwner = clinit;
3572 }
3573 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3574 } else {
3575 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3576 }
3577 lambdaEnv.info.yieldResult = null;
3578 lambdaEnv.info.isLambda = true;
3579 return lambdaEnv;
3580 }
3581
3582 @Override
3583 public void visitReference(final JCMemberReference that) {
3584 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3585 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3586 //method reference only allowed in assignment or method invocation/cast context
3587 log.error(that.pos(), Errors.UnexpectedMref);
3588 }
3589 result = that.type = types.createErrorType(pt());
3590 return;
3591 }
3592 final Env<AttrContext> localEnv = env.dup(that);
3593 try {
3594 //attribute member reference qualifier - if this is a constructor
3595 //reference, the expected kind must be a type
3596 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3597
3598 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3599 exprType = chk.checkConstructorRefType(that.expr, exprType);
3600 if (!exprType.isErroneous() &&
3601 exprType.isRaw() &&
3602 that.typeargs != null) {
3603 log.error(that.expr.pos(),
3604 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3605 Fragments.MrefInferAndExplicitParams));
3606 exprType = types.createErrorType(exprType);
3607 }
3608 }
3609
3610 if (exprType.isErroneous()) {
3611 //if the qualifier expression contains problems,
3612 //give up attribution of method reference
3613 result = that.type = exprType;
3614 return;
3615 }
3616
3617 if (TreeInfo.isStaticSelector(that.expr, names)) {
3618 //if the qualifier is a type, validate it; raw warning check is
3619 //omitted as we don't know at this stage as to whether this is a
3620 //raw selector (because of inference)
3621 chk.validate(that.expr, env, false);
3622 } else {
3623 Symbol lhsSym = TreeInfo.symbol(that.expr);
3624 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3625 }
3626 //attrib type-arguments
3627 List<Type> typeargtypes = List.nil();
3628 if (that.typeargs != null) {
3629 typeargtypes = attribTypes(that.typeargs, localEnv);
3630 }
3631
3632 boolean isTargetSerializable =
3633 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3634 rs.isSerializable(pt());
3635 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3636 Type currentTarget = targetInfo.target;
3637 Type desc = targetInfo.descriptor;
3638
3639 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3640 List<Type> argtypes = desc.getParameterTypes();
3641 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3642
3643 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3644 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3645 }
3646
3647 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3648 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3649 try {
3650 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3651 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3652 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3653 } finally {
3654 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3655 }
3656
3657 Symbol refSym = refResult.fst;
3658 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3659
3660 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3661 * JDK-8075541
3662 */
3663 if (refSym.kind != MTH) {
3664 boolean targetError;
3665 switch (refSym.kind) {
3666 case ABSENT_MTH:
3667 case MISSING_ENCL:
3668 targetError = false;
3669 break;
3670 case WRONG_MTH:
3671 case WRONG_MTHS:
3672 case AMBIGUOUS:
3673 case HIDDEN:
3674 case STATICERR:
3675 targetError = true;
3676 break;
3677 default:
3678 Assert.error("unexpected result kind " + refSym.kind);
3679 targetError = false;
3680 }
3681
3682 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3683 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3684 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3685
3686 JCDiagnostic diag = diags.create(log.currentSource(), that,
3687 targetError ?
3688 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3689 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3690
3691 if (targetError && currentTarget == Type.recoveryType) {
3692 //a target error doesn't make sense during recovery stage
3693 //as we don't know what actual parameter types are
3694 result = that.type = currentTarget;
3695 return;
3696 } else {
3697 if (targetError) {
3698 resultInfo.checkContext.report(that, diag);
3699 } else {
3700 log.report(diag);
3701 }
3702 result = that.type = types.createErrorType(currentTarget);
3703 return;
3704 }
3705 }
3706
3707 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3708 that.kind = lookupHelper.referenceKind(that.sym);
3709 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3710
3711 if (desc.getReturnType() == Type.recoveryType) {
3712 // stop here
3713 result = that.type = currentTarget;
3714 return;
3715 }
3716
3717 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3718 Type enclosingType = exprType.getEnclosingType();
3719 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3720 // Check for the existence of an appropriate outer instance
3721 rs.resolveImplicitThis(that.pos(), env, exprType);
3722 }
3723 }
3724
3725 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3726
3727 if (that.getMode() == ReferenceMode.INVOKE &&
3728 TreeInfo.isStaticSelector(that.expr, names) &&
3729 that.kind.isUnbound() &&
3730 lookupHelper.site.isRaw()) {
3731 chk.checkRaw(that.expr, localEnv);
3732 }
3733
3734 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3735 exprType.getTypeArguments().nonEmpty()) {
3736 //static ref with class type-args
3737 log.error(that.expr.pos(),
3738 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3739 Fragments.StaticMrefWithTargs));
3740 result = that.type = types.createErrorType(currentTarget);
3741 return;
3742 }
3743
3744 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3745 // Check that super-qualified symbols are not abstract (JLS)
3746 rs.checkNonAbstract(that.pos(), that.sym);
3747 }
3748
3749 if (isTargetSerializable) {
3750 chk.checkAccessFromSerializableElement(that, true);
3751 }
3752 }
3753
3754 ResultInfo checkInfo =
3755 resultInfo.dup(newMethodTemplate(
3756 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3757 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3758 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3759
3760 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3761
3762 if (that.kind.isUnbound() &&
3763 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3764 //re-generate inference constraints for unbound receiver
3765 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3766 //cannot happen as this has already been checked - we just need
3767 //to regenerate the inference constraints, as that has been lost
3768 //as a result of the call to inferenceContext.save()
3769 Assert.error("Can't get here");
3770 }
3771 }
3772
3773 if (!refType.isErroneous()) {
3774 refType = types.createMethodTypeWithReturn(refType,
3775 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3776 }
3777
3778 //go ahead with standard method reference compatibility check - note that param check
3779 //is a no-op (as this has been taken care during method applicability)
3780 boolean isSpeculativeRound =
3781 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3782
3783 that.type = currentTarget; //avoids recovery at this stage
3784 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3785 if (!isSpeculativeRound) {
3786 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3787 }
3788 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3789 } catch (Types.FunctionDescriptorLookupError ex) {
3790 JCDiagnostic cause = ex.getDiagnostic();
3791 resultInfo.checkContext.report(that, cause);
3792 result = that.type = types.createErrorType(pt());
3793 return;
3794 }
3795 }
3796 //where
3797 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3798 //if this is a constructor reference, the expected kind must be a type
3799 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3800 KindSelector.VAL_TYP : KindSelector.TYP,
3801 Type.noType);
3802 }
3803
3804
3805 @SuppressWarnings("fallthrough")
3806 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3807 InferenceContext inferenceContext = checkContext.inferenceContext();
3808 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3809
3810 Type resType;
3811 switch (tree.getMode()) {
3812 case NEW:
3813 if (!tree.expr.type.isRaw()) {
3814 resType = tree.expr.type;
3815 break;
3816 }
3817 default:
3818 resType = refType.getReturnType();
3819 }
3820
3821 Type incompatibleReturnType = resType;
3822
3823 if (returnType.hasTag(VOID)) {
3824 incompatibleReturnType = null;
3825 }
3826
3827 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3828 if (resType.isErroneous() ||
3829 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3830 checkContext.checkWarner(tree, resType, returnType))) {
3831 incompatibleReturnType = null;
3832 }
3833 }
3834
3835 if (incompatibleReturnType != null) {
3836 Fragment msg =
3837 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3838 checkContext.report(tree, diags.fragment(msg));
3839 } else {
3840 if (inferenceContext.free(refType)) {
3841 // we need to wait for inference to finish and then replace inference vars in the referent type
3842 inferenceContext.addFreeTypeListener(List.of(refType),
3843 instantiatedContext -> {
3844 tree.referentType = instantiatedContext.asInstType(refType);
3845 });
3846 } else {
3847 tree.referentType = refType;
3848 }
3849 }
3850
3851 if (!speculativeAttr) {
3852 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3853 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3854 }
3855 }
3856 }
3857
3858 boolean checkExConstraints(
3859 List<Type> thrownByFuncExpr,
3860 List<Type> thrownAtFuncType,
3861 InferenceContext inferenceContext) {
3862 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3863 * are not proper types
3864 */
3865 List<Type> nonProperList = thrownAtFuncType.stream()
3866 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3867 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3868
3869 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3870 * in the throws clause of the invocation type of the method reference's compile-time
3871 * declaration
3872 */
3873 List<Type> checkedList = thrownByFuncExpr.stream()
3874 .filter(e -> chk.isChecked(e)).collect(List.collector());
3875
3876 /** If n = 0 (the function type's throws clause consists only of proper types), then
3877 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3878 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3879 * reduces to true
3880 */
3881 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3882 for (Type checked : checkedList) {
3883 boolean isSubtype = false;
3884 for (Type proper : properList) {
3885 if (types.isSubtype(checked, proper)) {
3886 isSubtype = true;
3887 break;
3888 }
3889 }
3890 if (!isSubtype) {
3891 uncaughtByProperTypes.add(checked);
3892 }
3893 }
3894
3895 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3896 return false;
3897 }
3898
3899 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3900 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3901 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3902 */
3903 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3904 uncaughtByProperTypes.forEach(checkedEx -> {
3905 nonProperAsUndet.forEach(nonProper -> {
3906 types.isSubtype(checkedEx, nonProper);
3907 });
3908 });
3909
3910 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3911 */
3912 nonProperAsUndet.stream()
3913 .filter(t -> t.hasTag(UNDETVAR))
3914 .forEach(t -> ((UndetVar)t).setThrow());
3915 return true;
3916 }
3917
3918 /**
3919 * Set functional type info on the underlying AST. Note: as the target descriptor
3920 * might contain inference variables, we might need to register an hook in the
3921 * current inference context.
3922 */
3923 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3924 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3925 if (checkContext.inferenceContext().free(descriptorType)) {
3926 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3927 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3928 inferenceContext.asInstType(primaryTarget), checkContext));
3929 } else {
3930 if (pt.hasTag(CLASS)) {
3931 fExpr.target = primaryTarget;
3932 }
3933 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3934 pt != Type.recoveryType) {
3935 //check that functional interface class is well-formed
3936 try {
3937 /* Types.makeFunctionalInterfaceClass() may throw an exception
3938 * when it's executed post-inference. See the listener code
3939 * above.
3940 */
3941 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3942 names.empty, fExpr.target, ABSTRACT);
3943 if (csym != null) {
3944 chk.checkImplementations(env.tree, csym, csym);
3945 try {
3946 //perform an additional functional interface check on the synthetic class,
3947 //as there may be spurious errors for raw targets - because of existing issues
3948 //with membership and inheritance (see JDK-8074570).
3949 csym.flags_field |= INTERFACE;
3950 types.findDescriptorType(csym.type);
3951 } catch (FunctionDescriptorLookupError err) {
3952 resultInfo.checkContext.report(fExpr,
3953 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3954 }
3955 }
3956 } catch (Types.FunctionDescriptorLookupError ex) {
3957 JCDiagnostic cause = ex.getDiagnostic();
3958 resultInfo.checkContext.report(env.tree, cause);
3959 }
3960 }
3961 }
3962 }
3963
3964 public void visitParens(JCParens tree) {
3965 Type owntype = attribTree(tree.expr, env, resultInfo);
3966 result = check(tree, owntype, pkind(), resultInfo);
3967 Symbol sym = TreeInfo.symbol(tree);
3968 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3969 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3970 }
3971
3972 public void visitAssign(JCAssign tree) {
3973 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3974 Type capturedType = capture(owntype);
3975 attribExpr(tree.rhs, env, owntype);
3976 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3977 }
3978
3979 public void visitAssignop(JCAssignOp tree) {
3980 // Attribute arguments.
3981 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3982 Type operand = attribExpr(tree.rhs, env);
3983 // Find operator.
3984 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3985 if (operator != operators.noOpSymbol &&
3986 !owntype.isErroneous() &&
3987 !operand.isErroneous()) {
3988 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3989 chk.checkCastable(tree.rhs.pos(),
3990 operator.type.getReturnType(),
3991 owntype);
3992 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
3993 }
3994 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3995 }
3996
3997 public void visitUnary(JCUnary tree) {
3998 // Attribute arguments.
3999 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4000 ? attribTree(tree.arg, env, varAssignmentInfo)
4001 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4002
4003 // Find operator.
4004 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4005 Type owntype = types.createErrorType(tree.type);
4006 if (operator != operators.noOpSymbol &&
4007 !argtype.isErroneous()) {
4008 owntype = (tree.getTag().isIncOrDecUnaryOp())
4009 ? tree.arg.type
4010 : operator.type.getReturnType();
4011 int opc = operator.opcode;
4012
4013 // If the argument is constant, fold it.
4014 if (argtype.constValue() != null) {
4015 Type ctype = cfolder.fold1(opc, argtype);
4016 if (ctype != null) {
4017 owntype = cfolder.coerce(ctype, owntype);
4018 }
4019 }
4020 }
4021 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4022 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4023 }
4024
4025 public void visitBinary(JCBinary tree) {
4026 // Attribute arguments.
4027 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4028 // x && y
4029 // include x's bindings when true in y
4030
4031 // x || y
4032 // include x's bindings when false in y
4033
4034 MatchBindings lhsBindings = matchBindings;
4035 List<BindingSymbol> propagatedBindings;
4036 switch (tree.getTag()) {
4037 case AND:
4038 propagatedBindings = lhsBindings.bindingsWhenTrue;
4039 break;
4040 case OR:
4041 propagatedBindings = lhsBindings.bindingsWhenFalse;
4042 break;
4043 default:
4044 propagatedBindings = List.nil();
4045 break;
4046 }
4047 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4048 Type right;
4049 try {
4050 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4051 } finally {
4052 rhsEnv.info.scope.leave();
4053 }
4054
4055 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4056
4057 // Find operator.
4058 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4059 Type owntype = types.createErrorType(tree.type);
4060 if (operator != operators.noOpSymbol &&
4061 !left.isErroneous() &&
4062 !right.isErroneous()) {
4063 owntype = operator.type.getReturnType();
4064 int opc = operator.opcode;
4065 // If both arguments are constants, fold them.
4066 if (left.constValue() != null && right.constValue() != null) {
4067 Type ctype = cfolder.fold2(opc, left, right);
4068 if (ctype != null) {
4069 owntype = cfolder.coerce(ctype, owntype);
4070 }
4071 }
4072
4073 // Check that argument types of a reference ==, != are
4074 // castable to each other, (JLS 15.21). Note: unboxing
4075 // comparisons will not have an acmp* opc at this point.
4076 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4077 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4078 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4079 }
4080 }
4081
4082 chk.checkDivZero(tree.rhs.pos(), operator, right);
4083 }
4084 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4085 }
4086
4087 public void visitTypeCast(final JCTypeCast tree) {
4088 Type clazztype = attribType(tree.clazz, env);
4089 chk.validate(tree.clazz, env, false);
4090 //a fresh environment is required for 292 inference to work properly ---
4091 //see Infer.instantiatePolymorphicSignatureInstance()
4092 Env<AttrContext> localEnv = env.dup(tree);
4093 //should we propagate the target type?
4094 final ResultInfo castInfo;
4095 JCExpression expr = TreeInfo.skipParens(tree.expr);
4096 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4097 if (isPoly) {
4098 //expression is a poly - we need to propagate target type info
4099 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4100 new Check.NestedCheckContext(resultInfo.checkContext) {
4101 @Override
4102 public boolean compatible(Type found, Type req, Warner warn) {
4103 return types.isCastable(found, req, warn);
4104 }
4105 });
4106 } else {
4107 //standalone cast - target-type info is not propagated
4108 castInfo = unknownExprInfo;
4109 }
4110 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4111 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4112 if (exprtype.constValue() != null)
4113 owntype = cfolder.coerce(exprtype, owntype);
4114 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4115 if (!isPoly)
4116 chk.checkRedundantCast(localEnv, tree);
4117 }
4118
4119 public void visitTypeTest(JCInstanceOf tree) {
4120 Type exprtype = chk.checkNullOrRefType(
4121 tree.expr.pos(), attribExpr(tree.expr, env));
4122 Type clazztype;
4123 JCTree typeTree;
4124 if (tree.pattern.getTag() == BINDINGPATTERN ||
4125 tree.pattern.getTag() == RECORDPATTERN) {
4126 attribExpr(tree.pattern, env, exprtype);
4127 clazztype = tree.pattern.type;
4128 if (types.isSubtype(exprtype, clazztype) &&
4129 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4130 tree.pattern.getTag() != RECORDPATTERN) {
4131 if (!allowUnconditionalPatternsInstanceOf) {
4132 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4133 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4134 }
4135 }
4136 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4137 } else {
4138 clazztype = attribType(tree.pattern, env);
4139 typeTree = tree.pattern;
4140 chk.validate(typeTree, env, false);
4141 }
4142 if (!clazztype.hasTag(TYPEVAR)) {
4143 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4144 }
4145 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4146 boolean valid = false;
4147 if (allowReifiableTypesInInstanceof) {
4148 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4149 } else {
4150 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4151 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4152 allowReifiableTypesInInstanceof = true;
4153 }
4154 if (!valid) {
4155 clazztype = types.createErrorType(clazztype);
4156 }
4157 }
4158 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4159 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4160 }
4161
4162 private boolean checkCastablePattern(DiagnosticPosition pos,
4163 Type exprType,
4164 Type pattType) {
4165 Warner warner = new Warner();
4166 // if any type is erroneous, the problem is reported elsewhere
4167 if (exprType.isErroneous() || pattType.isErroneous()) {
4168 return false;
4169 }
4170 if (!types.isCastable(exprType, pattType, warner)) {
4171 chk.basicHandler.report(pos,
4172 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4173 return false;
4174 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4175 (!exprType.isPrimitive() ||
4176 !pattType.isPrimitive() ||
4177 !types.isSameType(exprType, pattType))) {
4178 chk.basicHandler.report(pos,
4179 diags.fragment(Fragments.NotApplicableTypes(exprType, pattType)));
4180 return false;
4181 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4182 log.error(pos,
4183 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4184 return false;
4185 } else {
4186 return true;
4187 }
4188 }
4189
4190 @Override
4191 public void visitAnyPattern(JCAnyPattern tree) {
4192 result = tree.type = resultInfo.pt;
4193 }
4194
4195 public void visitBindingPattern(JCBindingPattern tree) {
4196 Type type;
4197 if (tree.var.vartype != null) {
4198 type = attribType(tree.var.vartype, env);
4199 } else {
4200 type = resultInfo.pt;
4201 }
4202 tree.type = tree.var.type = type;
4203 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4204 v.pos = tree.pos;
4205 tree.var.sym = v;
4206 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4207 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4208 }
4209 if (tree.var.vartype != null) {
4210 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4211 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4212 annotate.flush();
4213 }
4214 chk.validate(tree.var.vartype, env, true);
4215 result = tree.type;
4216 if (v.isUnnamedVariable()) {
4217 matchBindings = MatchBindingsComputer.EMPTY;
4218 } else {
4219 matchBindings = new MatchBindings(List.of(v), List.nil());
4220 }
4221 }
4222
4223 @Override
4224 public void visitRecordPattern(JCRecordPattern tree) {
4225 Type site;
4226
4227 if (tree.deconstructor == null) {
4228 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4229 tree.record = syms.errSymbol;
4230 site = tree.type = types.createErrorType(tree.record.type);
4231 } else {
4232 Type type = attribType(tree.deconstructor, env);
4233 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4234 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4235 if (inferred == null) {
4236 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4237 } else {
4238 type = inferred;
4239 }
4240 }
4241 tree.type = tree.deconstructor.type = type;
4242 site = types.capture(tree.type);
4243 }
4244
4245 List<Type> expectedRecordTypes;
4246 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4247 ClassSymbol record = (ClassSymbol) site.tsym;
4248 expectedRecordTypes = record.getRecordComponents()
4249 .stream()
4250 .map(rc -> types.memberType(site, rc))
4251 .map(t -> types.upward(t, types.captures(t)).baseType())
4252 .collect(List.collector());
4253 tree.record = record;
4254 } else {
4255 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4256 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4257 .limit(tree.nested.size())
4258 .collect(List.collector());
4259 tree.record = syms.errSymbol;
4260 }
4261 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4262 List<Type> recordTypes = expectedRecordTypes;
4263 List<JCPattern> nestedPatterns = tree.nested;
4264 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4265 try {
4266 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4267 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4268 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4269 outBindings.addAll(matchBindings.bindingsWhenTrue);
4270 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4271 nestedPatterns = nestedPatterns.tail;
4272 recordTypes = recordTypes.tail;
4273 }
4274 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4275 while (nestedPatterns.nonEmpty()) {
4276 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4277 nestedPatterns = nestedPatterns.tail;
4278 }
4279 List<Type> nestedTypes =
4280 tree.nested.stream().map(p -> p.type).collect(List.collector());
4281 log.error(tree.pos(),
4282 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4283 nestedTypes));
4284 }
4285 } finally {
4286 localEnv.info.scope.leave();
4287 }
4288 chk.validate(tree.deconstructor, env, true);
4289 result = tree.type;
4290 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4291 }
4292
4293 public void visitIndexed(JCArrayAccess tree) {
4294 Type owntype = types.createErrorType(tree.type);
4295 Type atype = attribExpr(tree.indexed, env);
4296 attribExpr(tree.index, env, syms.intType);
4297 if (types.isArray(atype))
4298 owntype = types.elemtype(atype);
4299 else if (!atype.hasTag(ERROR))
4300 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4301 if (!pkind().contains(KindSelector.VAL))
4302 owntype = capture(owntype);
4303 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4304 }
4305
4306 public void visitIdent(JCIdent tree) {
4307 Symbol sym;
4308
4309 // Find symbol
4310 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4311 // If we are looking for a method, the prototype `pt' will be a
4312 // method type with the type of the call's arguments as parameters.
4313 env.info.pendingResolutionPhase = null;
4314 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4315 } else if (tree.sym != null && tree.sym.kind != VAR) {
4316 sym = tree.sym;
4317 } else {
4318 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4319 }
4320 tree.sym = sym;
4321
4322 // Also find the environment current for the class where
4323 // sym is defined (`symEnv').
4324 Env<AttrContext> symEnv = env;
4325 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4326 sym.kind.matches(KindSelector.VAL_MTH) &&
4327 sym.owner.kind == TYP &&
4328 tree.name != names._this && tree.name != names._super) {
4329
4330 // Find environment in which identifier is defined.
4331 while (symEnv.outer != null &&
4332 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4333 symEnv = symEnv.outer;
4334 }
4335 }
4336
4337 // If symbol is a variable, ...
4338 if (sym.kind == VAR) {
4339 VarSymbol v = (VarSymbol)sym;
4340
4341 // ..., evaluate its initializer, if it has one, and check for
4342 // illegal forward reference.
4343 checkInit(tree, env, v, false);
4344
4345 // If we are expecting a variable (as opposed to a value), check
4346 // that the variable is assignable in the current environment.
4347 if (KindSelector.ASG.subset(pkind()))
4348 checkAssignable(tree.pos(), v, null, env);
4349 }
4350
4351 Env<AttrContext> env1 = env;
4352 if (sym.kind != ERR && sym.kind != TYP &&
4353 sym.owner != null && sym.owner != env1.enclClass.sym) {
4354 // If the found symbol is inaccessible, then it is
4355 // accessed through an enclosing instance. Locate this
4356 // enclosing instance:
4357 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4358 env1 = env1.outer;
4359 }
4360
4361 if (env.info.isSerializable) {
4362 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4363 }
4364
4365 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4366 }
4367
4368 public void visitSelect(JCFieldAccess tree) {
4369 // Determine the expected kind of the qualifier expression.
4370 KindSelector skind = KindSelector.NIL;
4371 if (tree.name == names._this || tree.name == names._super ||
4372 tree.name == names._class)
4373 {
4374 skind = KindSelector.TYP;
4375 } else {
4376 if (pkind().contains(KindSelector.PCK))
4377 skind = KindSelector.of(skind, KindSelector.PCK);
4378 if (pkind().contains(KindSelector.TYP))
4379 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4380 if (pkind().contains(KindSelector.VAL_MTH))
4381 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4382 }
4383
4384 // Attribute the qualifier expression, and determine its symbol (if any).
4385 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4386 Assert.check(site == tree.selected.type);
4387 if (!pkind().contains(KindSelector.TYP_PCK))
4388 site = capture(site); // Capture field access
4389
4390 // don't allow T.class T[].class, etc
4391 if (skind == KindSelector.TYP) {
4392 Type elt = site;
4393 while (elt.hasTag(ARRAY))
4394 elt = ((ArrayType)elt).elemtype;
4395 if (elt.hasTag(TYPEVAR)) {
4396 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4397 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4398 tree.sym = tree.type.tsym;
4399 return ;
4400 }
4401 }
4402
4403 // If qualifier symbol is a type or `super', assert `selectSuper'
4404 // for the selection. This is relevant for determining whether
4405 // protected symbols are accessible.
4406 Symbol sitesym = TreeInfo.symbol(tree.selected);
4407 boolean selectSuperPrev = env.info.selectSuper;
4408 env.info.selectSuper =
4409 sitesym != null &&
4410 sitesym.name == names._super;
4411
4412 // Determine the symbol represented by the selection.
4413 env.info.pendingResolutionPhase = null;
4414 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4415 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4416 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4417 sym = syms.errSymbol;
4418 }
4419 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4420 site = capture(site);
4421 sym = selectSym(tree, sitesym, site, env, resultInfo);
4422 }
4423 boolean varArgs = env.info.lastResolveVarargs();
4424 tree.sym = sym;
4425
4426 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4427 site = types.skipTypeVars(site, true);
4428 }
4429
4430 // If that symbol is a variable, ...
4431 if (sym.kind == VAR) {
4432 VarSymbol v = (VarSymbol)sym;
4433
4434 // ..., evaluate its initializer, if it has one, and check for
4435 // illegal forward reference.
4436 checkInit(tree, env, v, true);
4437
4438 // If we are expecting a variable (as opposed to a value), check
4439 // that the variable is assignable in the current environment.
4440 if (KindSelector.ASG.subset(pkind()))
4441 checkAssignable(tree.pos(), v, tree.selected, env);
4442 }
4443
4444 if (sitesym != null &&
4445 sitesym.kind == VAR &&
4446 ((VarSymbol)sitesym).isResourceVariable() &&
4447 sym.kind == MTH &&
4448 sym.name.equals(names.close) &&
4449 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4450 env.info.lint.isEnabled(LintCategory.TRY)) {
4451 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4452 }
4453
4454 // Disallow selecting a type from an expression
4455 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4456 tree.type = check(tree.selected, pt(),
4457 sitesym == null ?
4458 KindSelector.VAL : sitesym.kind.toSelector(),
4459 new ResultInfo(KindSelector.TYP_PCK, pt()));
4460 }
4461
4462 if (isType(sitesym)) {
4463 if (sym.name != names._this && sym.name != names._super) {
4464 // Check if type-qualified fields or methods are static (JLS)
4465 if ((sym.flags() & STATIC) == 0 &&
4466 sym.name != names._super &&
4467 (sym.kind == VAR || sym.kind == MTH)) {
4468 rs.accessBase(rs.new StaticError(sym),
4469 tree.pos(), site, sym.name, true);
4470 }
4471 }
4472 } else if (sym.kind != ERR &&
4473 (sym.flags() & STATIC) != 0 &&
4474 sym.name != names._class) {
4475 // If the qualified item is not a type and the selected item is static, report
4476 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4477 if (!sym.owner.isAnonymous()) {
4478 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4479 } else {
4480 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4481 }
4482 }
4483
4484 // If we are selecting an instance member via a `super', ...
4485 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4486
4487 // Check that super-qualified symbols are not abstract (JLS)
4488 rs.checkNonAbstract(tree.pos(), sym);
4489
4490 if (site.isRaw()) {
4491 // Determine argument types for site.
4492 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4493 if (site1 != null) site = site1;
4494 }
4495 }
4496
4497 if (env.info.isSerializable) {
4498 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4499 }
4500
4501 env.info.selectSuper = selectSuperPrev;
4502 result = checkId(tree, site, sym, env, resultInfo);
4503 }
4504 //where
4505 /** Determine symbol referenced by a Select expression,
4506 *
4507 * @param tree The select tree.
4508 * @param site The type of the selected expression,
4509 * @param env The current environment.
4510 * @param resultInfo The current result.
4511 */
4512 private Symbol selectSym(JCFieldAccess tree,
4513 Symbol location,
4514 Type site,
4515 Env<AttrContext> env,
4516 ResultInfo resultInfo) {
4517 DiagnosticPosition pos = tree.pos();
4518 Name name = tree.name;
4519 switch (site.getTag()) {
4520 case PACKAGE:
4521 return rs.accessBase(
4522 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4523 pos, location, site, name, true);
4524 case ARRAY:
4525 case CLASS:
4526 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4527 return rs.resolveQualifiedMethod(
4528 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4529 } else if (name == names._this || name == names._super) {
4530 return rs.resolveSelf(pos, env, site.tsym, name);
4531 } else if (name == names._class) {
4532 // In this case, we have already made sure in
4533 // visitSelect that qualifier expression is a type.
4534 return syms.getClassField(site, types);
4535 } else {
4536 // We are seeing a plain identifier as selector.
4537 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4538 sym = rs.accessBase(sym, pos, location, site, name, true);
4539 return sym;
4540 }
4541 case WILDCARD:
4542 throw new AssertionError(tree);
4543 case TYPEVAR:
4544 // Normally, site.getUpperBound() shouldn't be null.
4545 // It should only happen during memberEnter/attribBase
4546 // when determining the supertype which *must* be
4547 // done before attributing the type variables. In
4548 // other words, we are seeing this illegal program:
4549 // class B<T> extends A<T.foo> {}
4550 Symbol sym = (site.getUpperBound() != null)
4551 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4552 : null;
4553 if (sym == null) {
4554 log.error(pos, Errors.TypeVarCantBeDeref);
4555 return syms.errSymbol;
4556 } else {
4557 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4558 rs.new AccessError(env, site, sym) :
4559 sym;
4560 rs.accessBase(sym2, pos, location, site, name, true);
4561 return sym;
4562 }
4563 case ERROR:
4564 // preserve identifier names through errors
4565 return types.createErrorType(name, site.tsym, site).tsym;
4566 default:
4567 // The qualifier expression is of a primitive type -- only
4568 // .class is allowed for these.
4569 if (name == names._class) {
4570 // In this case, we have already made sure in Select that
4571 // qualifier expression is a type.
4572 return syms.getClassField(site, types);
4573 } else {
4574 log.error(pos, Errors.CantDeref(site));
4575 return syms.errSymbol;
4576 }
4577 }
4578 }
4579
4580 /** Determine type of identifier or select expression and check that
4581 * (1) the referenced symbol is not deprecated
4582 * (2) the symbol's type is safe (@see checkSafe)
4583 * (3) if symbol is a variable, check that its type and kind are
4584 * compatible with the prototype and protokind.
4585 * (4) if symbol is an instance field of a raw type,
4586 * which is being assigned to, issue an unchecked warning if its
4587 * type changes under erasure.
4588 * (5) if symbol is an instance method of a raw type, issue an
4589 * unchecked warning if its argument types change under erasure.
4590 * If checks succeed:
4591 * If symbol is a constant, return its constant type
4592 * else if symbol is a method, return its result type
4593 * otherwise return its type.
4594 * Otherwise return errType.
4595 *
4596 * @param tree The syntax tree representing the identifier
4597 * @param site If this is a select, the type of the selected
4598 * expression, otherwise the type of the current class.
4599 * @param sym The symbol representing the identifier.
4600 * @param env The current environment.
4601 * @param resultInfo The expected result
4602 */
4603 Type checkId(JCTree tree,
4604 Type site,
4605 Symbol sym,
4606 Env<AttrContext> env,
4607 ResultInfo resultInfo) {
4608 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4609 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4610 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4611 }
4612
4613 Type checkMethodIdInternal(JCTree tree,
4614 Type site,
4615 Symbol sym,
4616 Env<AttrContext> env,
4617 ResultInfo resultInfo) {
4618 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4619 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4620 } else {
4621 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4622 }
4623 }
4624
4625 Type checkIdInternal(JCTree tree,
4626 Type site,
4627 Symbol sym,
4628 Type pt,
4629 Env<AttrContext> env,
4630 ResultInfo resultInfo) {
4631 if (pt.isErroneous()) {
4632 return types.createErrorType(site);
4633 }
4634 Type owntype; // The computed type of this identifier occurrence.
4635 switch (sym.kind) {
4636 case TYP:
4637 // For types, the computed type equals the symbol's type,
4638 // except for two situations:
4639 owntype = sym.type;
4640 if (owntype.hasTag(CLASS)) {
4641 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4642 Type ownOuter = owntype.getEnclosingType();
4643
4644 // (a) If the symbol's type is parameterized, erase it
4645 // because no type parameters were given.
4646 // We recover generic outer type later in visitTypeApply.
4647 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4648 owntype = types.erasure(owntype);
4649 }
4650
4651 // (b) If the symbol's type is an inner class, then
4652 // we have to interpret its outer type as a superclass
4653 // of the site type. Example:
4654 //
4655 // class Tree<A> { class Visitor { ... } }
4656 // class PointTree extends Tree<Point> { ... }
4657 // ...PointTree.Visitor...
4658 //
4659 // Then the type of the last expression above is
4660 // Tree<Point>.Visitor.
4661 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4662 Type normOuter = site;
4663 if (normOuter.hasTag(CLASS)) {
4664 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4665 }
4666 if (normOuter == null) // perhaps from an import
4667 normOuter = types.erasure(ownOuter);
4668 if (normOuter != ownOuter)
4669 owntype = new ClassType(
4670 normOuter, List.nil(), owntype.tsym,
4671 owntype.getMetadata());
4672 }
4673 }
4674 break;
4675 case VAR:
4676 VarSymbol v = (VarSymbol)sym;
4677
4678 if (env.info.enclVar != null
4679 && v.type.hasTag(NONE)) {
4680 //self reference to implicitly typed variable declaration
4681 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4682 return tree.type = v.type = types.createErrorType(v.type);
4683 }
4684
4685 // Test (4): if symbol is an instance field of a raw type,
4686 // which is being assigned to, issue an unchecked warning if
4687 // its type changes under erasure.
4688 if (KindSelector.ASG.subset(pkind()) &&
4689 v.owner.kind == TYP &&
4690 (v.flags() & STATIC) == 0 &&
4691 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4692 Type s = types.asOuterSuper(site, v.owner);
4693 if (s != null &&
4694 s.isRaw() &&
4695 !types.isSameType(v.type, v.erasure(types))) {
4696 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4697 }
4698 }
4699 // The computed type of a variable is the type of the
4700 // variable symbol, taken as a member of the site type.
4701 owntype = (sym.owner.kind == TYP &&
4702 sym.name != names._this && sym.name != names._super)
4703 ? types.memberType(site, sym)
4704 : sym.type;
4705
4706 // If the variable is a constant, record constant value in
4707 // computed type.
4708 if (v.getConstValue() != null && isStaticReference(tree))
4709 owntype = owntype.constType(v.getConstValue());
4710
4711 if (resultInfo.pkind == KindSelector.VAL) {
4712 owntype = capture(owntype); // capture "names as expressions"
4713 }
4714 break;
4715 case MTH: {
4716 owntype = checkMethod(site, sym,
4717 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4718 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4719 resultInfo.pt.getTypeArguments());
4720 chk.checkRestricted(tree.pos(), sym);
4721 break;
4722 }
4723 case PCK: case ERR:
4724 owntype = sym.type;
4725 break;
4726 default:
4727 throw new AssertionError("unexpected kind: " + sym.kind +
4728 " in tree " + tree);
4729 }
4730
4731 // Emit a `deprecation' warning if symbol is deprecated.
4732 // (for constructors (but not for constructor references), the error
4733 // was given when the constructor was resolved)
4734
4735 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4736 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4737 chk.checkSunAPI(tree.pos(), sym);
4738 chk.checkProfile(tree.pos(), sym);
4739 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4740 }
4741
4742 // If symbol is a variable, check that its type and
4743 // kind are compatible with the prototype and protokind.
4744 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4745 }
4746
4747 /** Check that variable is initialized and evaluate the variable's
4748 * initializer, if not yet done. Also check that variable is not
4749 * referenced before it is defined.
4750 * @param tree The tree making up the variable reference.
4751 * @param env The current environment.
4752 * @param v The variable's symbol.
4753 */
4754 private void checkInit(JCTree tree,
4755 Env<AttrContext> env,
4756 VarSymbol v,
4757 boolean onlyWarning) {
4758 // A forward reference is diagnosed if the declaration position
4759 // of the variable is greater than the current tree position
4760 // and the tree and variable definition occur in the same class
4761 // definition. Note that writes don't count as references.
4762 // This check applies only to class and instance
4763 // variables. Local variables follow different scope rules,
4764 // and are subject to definite assignment checking.
4765 Env<AttrContext> initEnv = enclosingInitEnv(env);
4766 if (initEnv != null &&
4767 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4768 v.owner.kind == TYP &&
4769 v.owner == env.info.scope.owner.enclClass() &&
4770 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4771 (!env.tree.hasTag(ASSIGN) ||
4772 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4773 if (!onlyWarning || isStaticEnumField(v)) {
4774 Error errkey = (initEnv.info.enclVar == v) ?
4775 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4776 log.error(tree.pos(), errkey);
4777 } else if (useBeforeDeclarationWarning) {
4778 Warning warnkey = (initEnv.info.enclVar == v) ?
4779 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4780 log.warning(tree.pos(), warnkey);
4781 }
4782 }
4783
4784 v.getConstValue(); // ensure initializer is evaluated
4785
4786 checkEnumInitializer(tree, env, v);
4787 }
4788
4789 /**
4790 * Returns the enclosing init environment associated with this env (if any). An init env
4791 * can be either a field declaration env or a static/instance initializer env.
4792 */
4793 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4794 while (true) {
4795 switch (env.tree.getTag()) {
4796 case VARDEF:
4797 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4798 if (vdecl.sym.owner.kind == TYP) {
4799 //field
4800 return env;
4801 }
4802 break;
4803 case BLOCK:
4804 if (env.next.tree.hasTag(CLASSDEF)) {
4805 //instance/static initializer
4806 return env;
4807 }
4808 break;
4809 case METHODDEF:
4810 case CLASSDEF:
4811 case TOPLEVEL:
4812 return null;
4813 }
4814 Assert.checkNonNull(env.next);
4815 env = env.next;
4816 }
4817 }
4818
4819 /**
4820 * Check for illegal references to static members of enum. In
4821 * an enum type, constructors and initializers may not
4822 * reference its static members unless they are constant.
4823 *
4824 * @param tree The tree making up the variable reference.
4825 * @param env The current environment.
4826 * @param v The variable's symbol.
4827 * @jls 8.9 Enum Types
4828 */
4829 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4830 // JLS:
4831 //
4832 // "It is a compile-time error to reference a static field
4833 // of an enum type that is not a compile-time constant
4834 // (15.28) from constructors, instance initializer blocks,
4835 // or instance variable initializer expressions of that
4836 // type. It is a compile-time error for the constructors,
4837 // instance initializer blocks, or instance variable
4838 // initializer expressions of an enum constant e to refer
4839 // to itself or to an enum constant of the same type that
4840 // is declared to the right of e."
4841 if (isStaticEnumField(v)) {
4842 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4843
4844 if (enclClass == null || enclClass.owner == null)
4845 return;
4846
4847 // See if the enclosing class is the enum (or a
4848 // subclass thereof) declaring v. If not, this
4849 // reference is OK.
4850 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4851 return;
4852
4853 // If the reference isn't from an initializer, then
4854 // the reference is OK.
4855 if (!Resolve.isInitializer(env))
4856 return;
4857
4858 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4859 }
4860 }
4861
4862 /** Is the given symbol a static, non-constant field of an Enum?
4863 * Note: enum literals should not be regarded as such
4864 */
4865 private boolean isStaticEnumField(VarSymbol v) {
4866 return Flags.isEnum(v.owner) &&
4867 Flags.isStatic(v) &&
4868 !Flags.isConstant(v) &&
4869 v.name != names._class;
4870 }
4871
4872 /**
4873 * Check that method arguments conform to its instantiation.
4874 **/
4875 public Type checkMethod(Type site,
4876 final Symbol sym,
4877 ResultInfo resultInfo,
4878 Env<AttrContext> env,
4879 final List<JCExpression> argtrees,
4880 List<Type> argtypes,
4881 List<Type> typeargtypes) {
4882 // Test (5): if symbol is an instance method of a raw type, issue
4883 // an unchecked warning if its argument types change under erasure.
4884 if ((sym.flags() & STATIC) == 0 &&
4885 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4886 Type s = types.asOuterSuper(site, sym.owner);
4887 if (s != null && s.isRaw() &&
4888 !types.isSameTypes(sym.type.getParameterTypes(),
4889 sym.erasure(types).getParameterTypes())) {
4890 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4891 }
4892 }
4893
4894 if (env.info.defaultSuperCallSite != null) {
4895 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4896 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4897 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4898 List<MethodSymbol> icand_sup =
4899 types.interfaceCandidates(sup, (MethodSymbol)sym);
4900 if (icand_sup.nonEmpty() &&
4901 icand_sup.head != sym &&
4902 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4903 log.error(env.tree.pos(),
4904 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4905 break;
4906 }
4907 }
4908 env.info.defaultSuperCallSite = null;
4909 }
4910
4911 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4912 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4913 if (app.meth.hasTag(SELECT) &&
4914 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4915 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4916 }
4917 }
4918
4919 // Compute the identifier's instantiated type.
4920 // For methods, we need to compute the instance type by
4921 // Resolve.instantiate from the symbol's type as well as
4922 // any type arguments and value arguments.
4923 Warner noteWarner = new Warner();
4924 try {
4925 Type owntype = rs.checkMethod(
4926 env,
4927 site,
4928 sym,
4929 resultInfo,
4930 argtypes,
4931 typeargtypes,
4932 noteWarner);
4933
4934 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4935 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4936
4937 argtypes = argtypes.map(checkDeferredMap);
4938
4939 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4940 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4941 sym.name,
4942 rs.methodArguments(sym.type.getParameterTypes()),
4943 rs.methodArguments(argtypes.map(checkDeferredMap)),
4944 kindName(sym.location()),
4945 sym.location()));
4946 if (resultInfo.pt != Infer.anyPoly ||
4947 !owntype.hasTag(METHOD) ||
4948 !owntype.isPartial()) {
4949 //if this is not a partially inferred method type, erase return type. Otherwise,
4950 //erasure is carried out in PartiallyInferredMethodType.check().
4951 owntype = new MethodType(owntype.getParameterTypes(),
4952 types.erasure(owntype.getReturnType()),
4953 types.erasure(owntype.getThrownTypes()),
4954 syms.methodClass);
4955 }
4956 }
4957
4958 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4959 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4960 PolyKind.POLY : PolyKind.STANDALONE;
4961 TreeInfo.setPolyKind(env.tree, pkind);
4962
4963 return (resultInfo.pt == Infer.anyPoly) ?
4964 owntype :
4965 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4966 resultInfo.checkContext.inferenceContext());
4967 } catch (Infer.InferenceException ex) {
4968 //invalid target type - propagate exception outwards or report error
4969 //depending on the current check context
4970 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4971 return types.createErrorType(site);
4972 } catch (Resolve.InapplicableMethodException ex) {
4973 final JCDiagnostic diag = ex.getDiagnostic();
4974 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4975 @Override
4976 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4977 return new Pair<>(sym, diag);
4978 }
4979 };
4980 List<Type> argtypes2 = argtypes.map(
4981 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4982 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4983 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4984 log.report(errDiag);
4985 return types.createErrorType(site);
4986 }
4987 }
4988
4989 public void visitLiteral(JCLiteral tree) {
4990 result = check(tree, litType(tree.typetag).constType(tree.value),
4991 KindSelector.VAL, resultInfo);
4992 }
4993 //where
4994 /** Return the type of a literal with given type tag.
4995 */
4996 Type litType(TypeTag tag) {
4997 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4998 }
4999
5000 public void visitStringTemplate(JCStringTemplate tree) {
5001 JCExpression processor = tree.processor;
5002 Type processorType = attribTree(processor, env, new ResultInfo(KindSelector.VAL, Type.noType));
5003 chk.checkProcessorType(processor, processorType, env);
5004 Type processMethodType = getProcessMethodType(tree, processorType);
5005 tree.processMethodType = processMethodType;
5006 Type resultType = processMethodType.getReturnType();
5007
5008 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
5009
5010 for (JCExpression arg : tree.expressions) {
5011 chk.checkNonVoid(arg.pos(), attribExpr(arg, localEnv));
5012 }
5013
5014 tree.type = resultType;
5015 result = resultType;
5016 check(tree, resultType, KindSelector.VAL, resultInfo);
5017 }
5018
5019 private Type getProcessMethodType(JCStringTemplate tree, Type processorType) {
5020 MethodSymbol processSymbol = rs.resolveInternalMethod(tree.pos(),
5021 env, types.skipTypeVars(processorType, false),
5022 names.process, List.of(syms.stringTemplateType), List.nil());
5023 return types.memberType(processorType, processSymbol);
5024 }
5025
5026 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5027 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5028 }
5029
5030 public void visitTypeArray(JCArrayTypeTree tree) {
5031 Type etype = attribType(tree.elemtype, env);
5032 Type type = new ArrayType(etype, syms.arrayClass);
5033 result = check(tree, type, KindSelector.TYP, resultInfo);
5034 }
5035
5036 /** Visitor method for parameterized types.
5037 * Bound checking is left until later, since types are attributed
5038 * before supertype structure is completely known
5039 */
5040 public void visitTypeApply(JCTypeApply tree) {
5041 Type owntype = types.createErrorType(tree.type);
5042
5043 // Attribute functor part of application and make sure it's a class.
5044 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5045
5046 // Attribute type parameters
5047 List<Type> actuals = attribTypes(tree.arguments, env);
5048
5049 if (clazztype.hasTag(CLASS)) {
5050 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5051 if (actuals.isEmpty()) //diamond
5052 actuals = formals;
5053
5054 if (actuals.length() == formals.length()) {
5055 List<Type> a = actuals;
5056 List<Type> f = formals;
5057 while (a.nonEmpty()) {
5058 a.head = a.head.withTypeVar(f.head);
5059 a = a.tail;
5060 f = f.tail;
5061 }
5062 // Compute the proper generic outer
5063 Type clazzOuter = clazztype.getEnclosingType();
5064 if (clazzOuter.hasTag(CLASS)) {
5065 Type site;
5066 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5067 if (clazz.hasTag(IDENT)) {
5068 site = env.enclClass.sym.type;
5069 } else if (clazz.hasTag(SELECT)) {
5070 site = ((JCFieldAccess) clazz).selected.type;
5071 } else throw new AssertionError(""+tree);
5072 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5073 if (site.hasTag(CLASS))
5074 site = types.asOuterSuper(site, clazzOuter.tsym);
5075 if (site == null)
5076 site = types.erasure(clazzOuter);
5077 clazzOuter = site;
5078 }
5079 }
5080 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5081 clazztype.getMetadata());
5082 } else {
5083 if (formals.length() != 0) {
5084 log.error(tree.pos(),
5085 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5086 } else {
5087 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5088 }
5089 owntype = types.createErrorType(tree.type);
5090 }
5091 }
5092 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5093 }
5094
5095 public void visitTypeUnion(JCTypeUnion tree) {
5096 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5097 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5098 for (JCExpression typeTree : tree.alternatives) {
5099 Type ctype = attribType(typeTree, env);
5100 ctype = chk.checkType(typeTree.pos(),
5101 chk.checkClassType(typeTree.pos(), ctype),
5102 syms.throwableType);
5103 if (!ctype.isErroneous()) {
5104 //check that alternatives of a union type are pairwise
5105 //unrelated w.r.t. subtyping
5106 if (chk.intersects(ctype, multicatchTypes.toList())) {
5107 for (Type t : multicatchTypes) {
5108 boolean sub = types.isSubtype(ctype, t);
5109 boolean sup = types.isSubtype(t, ctype);
5110 if (sub || sup) {
5111 //assume 'a' <: 'b'
5112 Type a = sub ? ctype : t;
5113 Type b = sub ? t : ctype;
5114 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5115 }
5116 }
5117 }
5118 multicatchTypes.append(ctype);
5119 if (all_multicatchTypes != null)
5120 all_multicatchTypes.append(ctype);
5121 } else {
5122 if (all_multicatchTypes == null) {
5123 all_multicatchTypes = new ListBuffer<>();
5124 all_multicatchTypes.appendList(multicatchTypes);
5125 }
5126 all_multicatchTypes.append(ctype);
5127 }
5128 }
5129 Type t = check(tree, types.lub(multicatchTypes.toList()),
5130 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5131 if (t.hasTag(CLASS)) {
5132 List<Type> alternatives =
5133 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5134 t = new UnionClassType((ClassType) t, alternatives);
5135 }
5136 tree.type = result = t;
5137 }
5138
5139 public void visitTypeIntersection(JCTypeIntersection tree) {
5140 attribTypes(tree.bounds, env);
5141 tree.type = result = checkIntersection(tree, tree.bounds);
5142 }
5143
5144 public void visitTypeParameter(JCTypeParameter tree) {
5145 TypeVar typeVar = (TypeVar) tree.type;
5146
5147 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5148 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5149 }
5150
5151 if (!typeVar.getUpperBound().isErroneous()) {
5152 //fixup type-parameter bound computed in 'attribTypeVariables'
5153 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5154 }
5155 }
5156
5157 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5158 Set<Symbol> boundSet = new HashSet<>();
5159 if (bounds.nonEmpty()) {
5160 // accept class or interface or typevar as first bound.
5161 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5162 boundSet.add(types.erasure(bounds.head.type).tsym);
5163 if (bounds.head.type.isErroneous()) {
5164 return bounds.head.type;
5165 }
5166 else if (bounds.head.type.hasTag(TYPEVAR)) {
5167 // if first bound was a typevar, do not accept further bounds.
5168 if (bounds.tail.nonEmpty()) {
5169 log.error(bounds.tail.head.pos(),
5170 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5171 return bounds.head.type;
5172 }
5173 } else {
5174 // if first bound was a class or interface, accept only interfaces
5175 // as further bounds.
5176 for (JCExpression bound : bounds.tail) {
5177 bound.type = checkBase(bound.type, bound, env, false, true, false);
5178 if (bound.type.isErroneous()) {
5179 bounds = List.of(bound);
5180 }
5181 else if (bound.type.hasTag(CLASS)) {
5182 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5183 }
5184 }
5185 }
5186 }
5187
5188 if (bounds.length() == 0) {
5189 return syms.objectType;
5190 } else if (bounds.length() == 1) {
5191 return bounds.head.type;
5192 } else {
5193 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5194 // ... the variable's bound is a class type flagged COMPOUND
5195 // (see comment for TypeVar.bound).
5196 // In this case, generate a class tree that represents the
5197 // bound class, ...
5198 JCExpression extending;
5199 List<JCExpression> implementing;
5200 if (!bounds.head.type.isInterface()) {
5201 extending = bounds.head;
5202 implementing = bounds.tail;
5203 } else {
5204 extending = null;
5205 implementing = bounds;
5206 }
5207 JCClassDecl cd = make.at(tree).ClassDef(
5208 make.Modifiers(PUBLIC | ABSTRACT),
5209 names.empty, List.nil(),
5210 extending, implementing, List.nil());
5211
5212 ClassSymbol c = (ClassSymbol)owntype.tsym;
5213 Assert.check((c.flags() & COMPOUND) != 0);
5214 cd.sym = c;
5215 c.sourcefile = env.toplevel.sourcefile;
5216
5217 // ... and attribute the bound class
5218 c.flags_field |= UNATTRIBUTED;
5219 Env<AttrContext> cenv = enter.classEnv(cd, env);
5220 typeEnvs.put(c, cenv);
5221 attribClass(c);
5222 return owntype;
5223 }
5224 }
5225
5226 public void visitWildcard(JCWildcard tree) {
5227 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5228 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5229 ? syms.objectType
5230 : attribType(tree.inner, env);
5231 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5232 tree.kind.kind,
5233 syms.boundClass),
5234 KindSelector.TYP, resultInfo);
5235 }
5236
5237 public void visitAnnotation(JCAnnotation tree) {
5238 Assert.error("should be handled in annotate");
5239 }
5240
5241 @Override
5242 public void visitModifiers(JCModifiers tree) {
5243 //error recovery only:
5244 Assert.check(resultInfo.pkind == KindSelector.ERR);
5245
5246 attribAnnotationTypes(tree.annotations, env);
5247 }
5248
5249 public void visitAnnotatedType(JCAnnotatedType tree) {
5250 attribAnnotationTypes(tree.annotations, env);
5251 Type underlyingType = attribType(tree.underlyingType, env);
5252 Type annotatedType = underlyingType.preannotatedType();
5253
5254 if (!env.info.isNewClass)
5255 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5256 result = tree.type = annotatedType;
5257 }
5258
5259 public void visitErroneous(JCErroneous tree) {
5260 if (tree.errs != null) {
5261 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup());
5262 errEnv.info.returnResult = unknownExprInfo;
5263 for (JCTree err : tree.errs)
5264 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5265 }
5266 result = tree.type = syms.errType;
5267 }
5268
5269 /** Default visitor method for all other trees.
5270 */
5271 public void visitTree(JCTree tree) {
5272 throw new AssertionError();
5273 }
5274
5275 /**
5276 * Attribute an env for either a top level tree or class or module declaration.
5277 */
5278 public void attrib(Env<AttrContext> env) {
5279 switch (env.tree.getTag()) {
5280 case MODULEDEF:
5281 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5282 break;
5283 case PACKAGEDEF:
5284 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5285 break;
5286 default:
5287 attribClass(env.tree.pos(), env.enclClass.sym);
5288 }
5289 }
5290
5291 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5292 try {
5293 annotate.flush();
5294 attribPackage(p);
5295 } catch (CompletionFailure ex) {
5296 chk.completionError(pos, ex);
5297 }
5298 }
5299
5300 void attribPackage(PackageSymbol p) {
5301 attribWithLint(p,
5302 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5303 }
5304
5305 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5306 try {
5307 annotate.flush();
5308 attribModule(m);
5309 } catch (CompletionFailure ex) {
5310 chk.completionError(pos, ex);
5311 }
5312 }
5313
5314 void attribModule(ModuleSymbol m) {
5315 attribWithLint(m, env -> attribStat(env.tree, env));
5316 }
5317
5318 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5319 Env<AttrContext> env = typeEnvs.get(sym);
5320
5321 Env<AttrContext> lintEnv = env;
5322 while (lintEnv.info.lint == null)
5323 lintEnv = lintEnv.next;
5324
5325 Lint lint = lintEnv.info.lint.augment(sym);
5326
5327 Lint prevLint = chk.setLint(lint);
5328 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5329
5330 try {
5331 deferredLintHandler.flush(env.tree.pos());
5332 attrib.accept(env);
5333 } finally {
5334 log.useSource(prev);
5335 chk.setLint(prevLint);
5336 }
5337 }
5338
5339 /** Main method: attribute class definition associated with given class symbol.
5340 * reporting completion failures at the given position.
5341 * @param pos The source position at which completion errors are to be
5342 * reported.
5343 * @param c The class symbol whose definition will be attributed.
5344 */
5345 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5346 try {
5347 annotate.flush();
5348 attribClass(c);
5349 } catch (CompletionFailure ex) {
5350 chk.completionError(pos, ex);
5351 }
5352 }
5353
5354 /** Attribute class definition associated with given class symbol.
5355 * @param c The class symbol whose definition will be attributed.
5356 */
5357 void attribClass(ClassSymbol c) throws CompletionFailure {
5358 if (c.type.hasTag(ERROR)) return;
5359
5360 // Check for cycles in the inheritance graph, which can arise from
5361 // ill-formed class files.
5362 chk.checkNonCyclic(null, c.type);
5363
5364 Type st = types.supertype(c.type);
5365 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5366 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5367 // First, attribute superclass.
5368 if (st.hasTag(CLASS))
5369 attribClass((ClassSymbol)st.tsym);
5370
5371 // Next attribute owner, if it is a class.
5372 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5373 attribClass((ClassSymbol)c.owner);
5374
5375 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5376 }
5377
5378 // The previous operations might have attributed the current class
5379 // if there was a cycle. So we test first whether the class is still
5380 // UNATTRIBUTED.
5381 if ((c.flags_field & UNATTRIBUTED) != 0) {
5382 c.flags_field &= ~UNATTRIBUTED;
5383
5384 // Get environment current at the point of class definition.
5385 Env<AttrContext> env = typeEnvs.get(c);
5386
5387 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5388 // because the annotations were not available at the time the env was created. Therefore,
5389 // we look up the environment chain for the first enclosing environment for which the
5390 // lint value is set. Typically, this is the parent env, but might be further if there
5391 // are any envs created as a result of TypeParameter nodes.
5392 Env<AttrContext> lintEnv = env;
5393 while (lintEnv.info.lint == null)
5394 lintEnv = lintEnv.next;
5395
5396 // Having found the enclosing lint value, we can initialize the lint value for this class
5397 env.info.lint = lintEnv.info.lint.augment(c);
5398
5399 Lint prevLint = chk.setLint(env.info.lint);
5400 JavaFileObject prev = log.useSource(c.sourcefile);
5401 ResultInfo prevReturnRes = env.info.returnResult;
5402
5403 try {
5404 if (c.isSealed() &&
5405 !c.isEnum() &&
5406 !c.isPermittedExplicit &&
5407 c.permitted.isEmpty()) {
5408 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5409 }
5410
5411 if (c.isSealed()) {
5412 Set<Symbol> permittedTypes = new HashSet<>();
5413 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5414 for (Symbol subTypeSym : c.permitted) {
5415 boolean isTypeVar = false;
5416 if (subTypeSym.type.getTag() == TYPEVAR) {
5417 isTypeVar = true; //error recovery
5418 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5419 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5420 }
5421 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5422 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5423 }
5424 if (permittedTypes.contains(subTypeSym)) {
5425 DiagnosticPosition pos =
5426 env.enclClass.permitting.stream()
5427 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5428 .limit(2).collect(List.collector()).get(1);
5429 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5430 } else {
5431 permittedTypes.add(subTypeSym);
5432 }
5433 if (sealedInUnnamed) {
5434 if (subTypeSym.packge() != c.packge()) {
5435 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5436 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5437 );
5438 }
5439 } else if (subTypeSym.packge().modle != c.packge().modle) {
5440 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5441 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5442 );
5443 }
5444 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5445 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5446 Errors.InvalidPermitsClause(
5447 subTypeSym == c.type.tsym ?
5448 Fragments.MustNotBeSameClass :
5449 Fragments.MustNotBeSupertype(subTypeSym.type)
5450 )
5451 );
5452 } else if (!isTypeVar) {
5453 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5454 .stream()
5455 .anyMatch(d -> d.tsym == c);
5456 if (!thisIsASuper) {
5457 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5458 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5459 }
5460 }
5461 }
5462 }
5463
5464 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5465 .stream()
5466 .filter(s -> s.tsym.isSealed())
5467 .map(s -> (ClassSymbol) s.tsym)
5468 .collect(List.collector());
5469
5470 if (sealedSupers.isEmpty()) {
5471 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5472 boolean hasErrorSuper = false;
5473
5474 hasErrorSuper |= types.directSupertypes(c.type)
5475 .stream()
5476 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5477
5478 ClassType ct = (ClassType) c.type;
5479
5480 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5481
5482 if (!hasErrorSuper) {
5483 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5484 }
5485 }
5486 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5487 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5488 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5489 }
5490
5491 if (!c.type.isCompound()) {
5492 for (ClassSymbol supertypeSym : sealedSupers) {
5493 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5494 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5495 }
5496 }
5497 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5498 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5499 c.isInterface() ?
5500 Errors.NonSealedOrSealedExpected :
5501 Errors.NonSealedSealedOrFinalExpected);
5502 }
5503 }
5504 }
5505
5506 deferredLintHandler.flush(env.tree);
5507 env.info.returnResult = null;
5508 // java.lang.Enum may not be subclassed by a non-enum
5509 if (st.tsym == syms.enumSym &&
5510 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5511 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5512
5513 // Enums may not be extended by source-level classes
5514 if (st.tsym != null &&
5515 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5516 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5517 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5518 }
5519
5520 if (rs.isSerializable(c.type)) {
5521 env.info.isSerializable = true;
5522 }
5523
5524 if (c.isValueClass()) {
5525 Assert.check(env.tree.hasTag(CLASSDEF));
5526 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5527 }
5528
5529 attribClassBody(env, c);
5530
5531 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5532 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5533 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5534 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5535
5536 if ((c.flags_field & Flags.UNNAMED_CLASS) != 0) {
5537 chk.checkHasMain(env.tree.pos(), c);
5538 }
5539 } finally {
5540 env.info.returnResult = prevReturnRes;
5541 log.useSource(prev);
5542 chk.setLint(prevLint);
5543 }
5544
5545 }
5546 }
5547
5548 public void visitImport(JCImport tree) {
5549 // nothing to do
5550 }
5551
5552 public void visitModuleDef(JCModuleDecl tree) {
5553 tree.sym.completeUsesProvides();
5554 ModuleSymbol msym = tree.sym;
5555 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5556 Lint prevLint = chk.setLint(lint);
5557 chk.checkModuleName(tree);
5558 chk.checkDeprecatedAnnotation(tree, msym);
5559
5560 try {
5561 deferredLintHandler.flush(tree.pos());
5562 } finally {
5563 chk.setLint(prevLint);
5564 }
5565 }
5566
5567 /** Finish the attribution of a class. */
5568 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5569 JCClassDecl tree = (JCClassDecl)env.tree;
5570 Assert.check(c == tree.sym);
5571
5572 // Validate type parameters, supertype and interfaces.
5573 attribStats(tree.typarams, env);
5574 if (!c.isAnonymous()) {
5575 //already checked if anonymous
5576 chk.validate(tree.typarams, env);
5577 chk.validate(tree.extending, env);
5578 chk.validate(tree.implementing, env);
5579 }
5580
5581 c.markAbstractIfNeeded(types);
5582
5583 // If this is a non-abstract class, check that it has no abstract
5584 // methods or unimplemented methods of an implemented interface.
5585 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5586 chk.checkAllDefined(tree.pos(), c);
5587 }
5588
5589 if ((c.flags() & ANNOTATION) != 0) {
5590 if (tree.implementing.nonEmpty())
5591 log.error(tree.implementing.head.pos(),
5592 Errors.CantExtendIntfAnnotation);
5593 if (tree.typarams.nonEmpty()) {
5594 log.error(tree.typarams.head.pos(),
5595 Errors.IntfAnnotationCantHaveTypeParams(c));
5596 }
5597
5598 // If this annotation type has a @Repeatable, validate
5599 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5600 // If this annotation type has a @Repeatable, validate
5601 if (repeatable != null) {
5602 // get diagnostic position for error reporting
5603 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5604 Assert.checkNonNull(cbPos);
5605
5606 chk.validateRepeatable(c, repeatable, cbPos);
5607 }
5608 } else {
5609 // Check that all extended classes and interfaces
5610 // are compatible (i.e. no two define methods with same arguments
5611 // yet different return types). (JLS 8.4.8.3)
5612 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5613 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5614 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5615 }
5616
5617 // Check that class does not import the same parameterized interface
5618 // with two different argument lists.
5619 chk.checkClassBounds(tree.pos(), c.type);
5620
5621 tree.type = c.type;
5622
5623 for (List<JCTypeParameter> l = tree.typarams;
5624 l.nonEmpty(); l = l.tail) {
5625 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5626 }
5627
5628 // Check that a generic class doesn't extend Throwable
5629 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5630 log.error(tree.extending.pos(), Errors.GenericThrowable);
5631
5632 // Check that all methods which implement some
5633 // method conform to the method they implement.
5634 chk.checkImplementations(tree);
5635
5636 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5637 checkAutoCloseable(tree.pos(), env, c.type);
5638
5639 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5640 // Attribute declaration
5641 attribStat(l.head, env);
5642 // Check that declarations in inner classes are not static (JLS 8.1.2)
5643 // Make an exception for static constants.
5644 if (!allowRecords &&
5645 c.owner.kind != PCK &&
5646 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5647 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5648 VarSymbol sym = null;
5649 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5650 if (sym == null ||
5651 sym.kind != VAR ||
5652 sym.getConstValue() == null)
5653 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5654 }
5655 }
5656
5657 // Check for proper placement of super()/this() calls.
5658 chk.checkSuperInitCalls(tree);
5659
5660 // Check for cycles among non-initial constructors.
5661 chk.checkCyclicConstructors(tree);
5662
5663 // Check for cycles among annotation elements.
5664 chk.checkNonCyclicElements(tree);
5665
5666 // Check for proper use of serialVersionUID and other
5667 // serialization-related fields and methods
5668 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5669 && rs.isSerializable(c.type)
5670 && !c.isAnonymous()) {
5671 chk.checkSerialStructure(tree, c);
5672 }
5673 // Correctly organize the positions of the type annotations
5674 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5675
5676 // Check type annotations applicability rules
5677 validateTypeAnnotations(tree, false);
5678 }
5679 // where
5680 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5681 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5682 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5683 if (types.isSameType(al.head.annotationType.type, t))
5684 return al.head.pos();
5685 }
5686
5687 return null;
5688 }
5689
5690 private Type capture(Type type) {
5691 return types.capture(type);
5692 }
5693
5694 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5695 if (type.isErroneous()) {
5696 tree.vartype = make.at(Position.NOPOS).Erroneous();
5697 } else {
5698 tree.vartype = make.at(Position.NOPOS).Type(type);
5699 }
5700 }
5701
5702 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5703 tree.accept(new TypeAnnotationsValidator(sigOnly));
5704 }
5705 //where
5706 private final class TypeAnnotationsValidator extends TreeScanner {
5707
5708 private final boolean sigOnly;
5709 public TypeAnnotationsValidator(boolean sigOnly) {
5710 this.sigOnly = sigOnly;
5711 }
5712
5713 public void visitAnnotation(JCAnnotation tree) {
5714 chk.validateTypeAnnotation(tree, null, false);
5715 super.visitAnnotation(tree);
5716 }
5717 public void visitAnnotatedType(JCAnnotatedType tree) {
5718 if (!tree.underlyingType.type.isErroneous()) {
5719 super.visitAnnotatedType(tree);
5720 }
5721 }
5722 public void visitTypeParameter(JCTypeParameter tree) {
5723 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5724 scan(tree.bounds);
5725 // Don't call super.
5726 // This is needed because above we call validateTypeAnnotation with
5727 // false, which would forbid annotations on type parameters.
5728 // super.visitTypeParameter(tree);
5729 }
5730 public void visitMethodDef(JCMethodDecl tree) {
5731 if (tree.recvparam != null &&
5732 !tree.recvparam.vartype.type.isErroneous()) {
5733 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5734 }
5735 if (tree.restype != null && tree.restype.type != null) {
5736 validateAnnotatedType(tree.restype, tree.restype.type);
5737 }
5738 if (sigOnly) {
5739 scan(tree.mods);
5740 scan(tree.restype);
5741 scan(tree.typarams);
5742 scan(tree.recvparam);
5743 scan(tree.params);
5744 scan(tree.thrown);
5745 } else {
5746 scan(tree.defaultValue);
5747 scan(tree.body);
5748 }
5749 }
5750 public void visitVarDef(final JCVariableDecl tree) {
5751 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5752 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5753 validateAnnotatedType(tree.vartype, tree.sym.type);
5754 scan(tree.mods);
5755 scan(tree.vartype);
5756 if (!sigOnly) {
5757 scan(tree.init);
5758 }
5759 }
5760 public void visitTypeCast(JCTypeCast tree) {
5761 if (tree.clazz != null && tree.clazz.type != null)
5762 validateAnnotatedType(tree.clazz, tree.clazz.type);
5763 super.visitTypeCast(tree);
5764 }
5765 public void visitTypeTest(JCInstanceOf tree) {
5766 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5767 validateAnnotatedType(tree.pattern, tree.pattern.type);
5768 super.visitTypeTest(tree);
5769 }
5770 public void visitNewClass(JCNewClass tree) {
5771 if (tree.clazz != null && tree.clazz.type != null) {
5772 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5773 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5774 tree.clazz.type.tsym);
5775 }
5776 if (tree.def != null) {
5777 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5778 }
5779
5780 validateAnnotatedType(tree.clazz, tree.clazz.type);
5781 }
5782 super.visitNewClass(tree);
5783 }
5784 public void visitNewArray(JCNewArray tree) {
5785 if (tree.elemtype != null && tree.elemtype.type != null) {
5786 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5787 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5788 tree.elemtype.type.tsym);
5789 }
5790 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5791 }
5792 super.visitNewArray(tree);
5793 }
5794 public void visitClassDef(JCClassDecl tree) {
5795 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5796 if (sigOnly) {
5797 scan(tree.mods);
5798 scan(tree.typarams);
5799 scan(tree.extending);
5800 scan(tree.implementing);
5801 }
5802 for (JCTree member : tree.defs) {
5803 if (member.hasTag(Tag.CLASSDEF)) {
5804 continue;
5805 }
5806 scan(member);
5807 }
5808 }
5809 public void visitBlock(JCBlock tree) {
5810 if (!sigOnly) {
5811 scan(tree.stats);
5812 }
5813 }
5814
5815 /* I would want to model this after
5816 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5817 * and override visitSelect and visitTypeApply.
5818 * However, we only set the annotated type in the top-level type
5819 * of the symbol.
5820 * Therefore, we need to override each individual location where a type
5821 * can occur.
5822 */
5823 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5824 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5825
5826 if (type.isPrimitiveOrVoid()) {
5827 return;
5828 }
5829
5830 JCTree enclTr = errtree;
5831 Type enclTy = type;
5832
5833 boolean repeat = true;
5834 while (repeat) {
5835 if (enclTr.hasTag(TYPEAPPLY)) {
5836 List<Type> tyargs = enclTy.getTypeArguments();
5837 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5838 if (trargs.length() > 0) {
5839 // Nothing to do for diamonds
5840 if (tyargs.length() == trargs.length()) {
5841 for (int i = 0; i < tyargs.length(); ++i) {
5842 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5843 }
5844 }
5845 // If the lengths don't match, it's either a diamond
5846 // or some nested type that redundantly provides
5847 // type arguments in the tree.
5848 }
5849
5850 // Look at the clazz part of a generic type
5851 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5852 }
5853
5854 if (enclTr.hasTag(SELECT)) {
5855 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5856 if (enclTy != null &&
5857 !enclTy.hasTag(NONE)) {
5858 enclTy = enclTy.getEnclosingType();
5859 }
5860 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5861 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5862 if (enclTy == null || enclTy.hasTag(NONE)) {
5863 if (at.getAnnotations().size() == 1) {
5864 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5865 } else {
5866 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5867 for (JCAnnotation an : at.getAnnotations()) {
5868 comps.add(an.attribute);
5869 }
5870 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5871 }
5872 repeat = false;
5873 }
5874 enclTr = at.underlyingType;
5875 // enclTy doesn't need to be changed
5876 } else if (enclTr.hasTag(IDENT)) {
5877 repeat = false;
5878 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5879 JCWildcard wc = (JCWildcard) enclTr;
5880 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5881 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5882 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5883 } else {
5884 // Nothing to do for UNBOUND
5885 }
5886 repeat = false;
5887 } else if (enclTr.hasTag(TYPEARRAY)) {
5888 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5889 validateAnnotatedType(art.getType(), art.elemtype.type);
5890 repeat = false;
5891 } else if (enclTr.hasTag(TYPEUNION)) {
5892 JCTypeUnion ut = (JCTypeUnion) enclTr;
5893 for (JCTree t : ut.getTypeAlternatives()) {
5894 validateAnnotatedType(t, t.type);
5895 }
5896 repeat = false;
5897 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5898 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5899 for (JCTree t : it.getBounds()) {
5900 validateAnnotatedType(t, t.type);
5901 }
5902 repeat = false;
5903 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5904 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5905 repeat = false;
5906 } else {
5907 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5908 " within: "+ errtree + " with kind: " + errtree.getKind());
5909 }
5910 }
5911 }
5912
5913 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5914 Symbol sym) {
5915 // Ensure that no declaration annotations are present.
5916 // Note that a tree type might be an AnnotatedType with
5917 // empty annotations, if only declaration annotations were given.
5918 // This method will raise an error for such a type.
5919 for (JCAnnotation ai : annotations) {
5920 if (!ai.type.isErroneous() &&
5921 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5922 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5923 }
5924 }
5925 }
5926 }
5927
5928 // <editor-fold desc="post-attribution visitor">
5929
5930 /**
5931 * Handle missing types/symbols in an AST. This routine is useful when
5932 * the compiler has encountered some errors (which might have ended up
5933 * terminating attribution abruptly); if the compiler is used in fail-over
5934 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5935 * prevents NPE to be propagated during subsequent compilation steps.
5936 */
5937 public void postAttr(JCTree tree) {
5938 new PostAttrAnalyzer().scan(tree);
5939 }
5940
5941 class PostAttrAnalyzer extends TreeScanner {
5942
5943 private void initTypeIfNeeded(JCTree that) {
5944 if (that.type == null) {
5945 if (that.hasTag(METHODDEF)) {
5946 that.type = dummyMethodType((JCMethodDecl)that);
5947 } else {
5948 that.type = syms.unknownType;
5949 }
5950 }
5951 }
5952
5953 /* Construct a dummy method type. If we have a method declaration,
5954 * and the declared return type is void, then use that return type
5955 * instead of UNKNOWN to avoid spurious error messages in lambda
5956 * bodies (see:JDK-8041704).
5957 */
5958 private Type dummyMethodType(JCMethodDecl md) {
5959 Type restype = syms.unknownType;
5960 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5961 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5962 if (prim.typetag == VOID)
5963 restype = syms.voidType;
5964 }
5965 return new MethodType(List.nil(), restype,
5966 List.nil(), syms.methodClass);
5967 }
5968 private Type dummyMethodType() {
5969 return dummyMethodType(null);
5970 }
5971
5972 @Override
5973 public void scan(JCTree tree) {
5974 if (tree == null) return;
5975 if (tree instanceof JCExpression) {
5976 initTypeIfNeeded(tree);
5977 }
5978 super.scan(tree);
5979 }
5980
5981 @Override
5982 public void visitIdent(JCIdent that) {
5983 if (that.sym == null) {
5984 that.sym = syms.unknownSymbol;
5985 }
5986 }
5987
5988 @Override
5989 public void visitSelect(JCFieldAccess that) {
5990 if (that.sym == null) {
5991 that.sym = syms.unknownSymbol;
5992 }
5993 super.visitSelect(that);
5994 }
5995
5996 @Override
5997 public void visitClassDef(JCClassDecl that) {
5998 initTypeIfNeeded(that);
5999 if (that.sym == null) {
6000 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6001 }
6002 super.visitClassDef(that);
6003 }
6004
6005 @Override
6006 public void visitMethodDef(JCMethodDecl that) {
6007 initTypeIfNeeded(that);
6008 if (that.sym == null) {
6009 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6010 }
6011 super.visitMethodDef(that);
6012 }
6013
6014 @Override
6015 public void visitVarDef(JCVariableDecl that) {
6016 initTypeIfNeeded(that);
6017 if (that.sym == null) {
6018 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6019 that.sym.adr = 0;
6020 }
6021 if (that.vartype == null) {
6022 that.vartype = make.at(Position.NOPOS).Erroneous();
6023 }
6024 super.visitVarDef(that);
6025 }
6026
6027 @Override
6028 public void visitBindingPattern(JCBindingPattern that) {
6029 initTypeIfNeeded(that);
6030 initTypeIfNeeded(that.var);
6031 if (that.var.sym == null) {
6032 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6033 that.var.sym.adr = 0;
6034 }
6035 super.visitBindingPattern(that);
6036 }
6037
6038 @Override
6039 public void visitNewClass(JCNewClass that) {
6040 if (that.constructor == null) {
6041 that.constructor = new MethodSymbol(0, names.init,
6042 dummyMethodType(), syms.noSymbol);
6043 }
6044 if (that.constructorType == null) {
6045 that.constructorType = syms.unknownType;
6046 }
6047 super.visitNewClass(that);
6048 }
6049
6050 @Override
6051 public void visitAssignop(JCAssignOp that) {
6052 if (that.operator == null) {
6053 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6054 -1, syms.noSymbol);
6055 }
6056 super.visitAssignop(that);
6057 }
6058
6059 @Override
6060 public void visitBinary(JCBinary that) {
6061 if (that.operator == null) {
6062 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6063 -1, syms.noSymbol);
6064 }
6065 super.visitBinary(that);
6066 }
6067
6068 @Override
6069 public void visitUnary(JCUnary that) {
6070 if (that.operator == null) {
6071 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6072 -1, syms.noSymbol);
6073 }
6074 super.visitUnary(that);
6075 }
6076
6077 @Override
6078 public void visitReference(JCMemberReference that) {
6079 super.visitReference(that);
6080 if (that.sym == null) {
6081 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6082 syms.noSymbol);
6083 }
6084 }
6085 }
6086 // </editor-fold>
6087
6088 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6089 new TreeScanner() {
6090 Symbol packge = pkg;
6091 @Override
6092 public void visitIdent(JCIdent that) {
6093 that.sym = packge;
6094 }
6095
6096 @Override
6097 public void visitSelect(JCFieldAccess that) {
6098 that.sym = packge;
6099 packge = packge.owner;
6100 super.visitSelect(that);
6101 }
6102 }.scan(pid);
6103 }
6104
6105 }