1 /*
2 * Copyright (c) 1999, 2025, 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.LintMapper;
45 import com.sun.tools.javac.code.Scope.WriteableScope;
46 import com.sun.tools.javac.code.Source.Feature;
47 import com.sun.tools.javac.code.Symbol.*;
48 import com.sun.tools.javac.code.Type.*;
49 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
50 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
51 import com.sun.tools.javac.comp.Check.CheckContext;
52 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
53 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
54 import com.sun.tools.javac.jvm.*;
55
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
59
60 import com.sun.tools.javac.resources.CompilerProperties.Errors;
61 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
62 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
63 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
64 import com.sun.tools.javac.tree.*;
65 import com.sun.tools.javac.tree.JCTree.*;
66 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
67 import com.sun.tools.javac.util.*;
68 import com.sun.tools.javac.util.DefinedBy.Api;
69 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
70 import com.sun.tools.javac.util.JCDiagnostic.Error;
71 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
72 import com.sun.tools.javac.util.JCDiagnostic.Warning;
73 import com.sun.tools.javac.util.List;
74
75 import static com.sun.tools.javac.code.Flags.*;
76 import static com.sun.tools.javac.code.Flags.ANNOTATION;
77 import static com.sun.tools.javac.code.Flags.BLOCK;
78 import static com.sun.tools.javac.code.Kinds.*;
79 import static com.sun.tools.javac.code.Kinds.Kind.*;
80 import static com.sun.tools.javac.code.TypeTag.*;
81 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
82 import static com.sun.tools.javac.tree.JCTree.Tag.*;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final LintMapper lintMapper;
103 final Symtab syms;
104 final Resolve rs;
105 final Operators operators;
106 final Infer infer;
107 final Analyzer analyzer;
108 final DeferredAttr deferredAttr;
109 final Check chk;
110 final Flow flow;
111 final MemberEnter memberEnter;
112 final TypeEnter typeEnter;
113 final TreeMaker make;
114 final ConstFold cfolder;
115 final Enter enter;
116 final Target target;
117 final Types types;
118 final Preview preview;
119 final JCDiagnostic.Factory diags;
120 final TypeAnnotations typeAnnotations;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127 final LocalProxyVarsGen localProxyVarsGen;
128
129 public static Attr instance(Context context) {
130 Attr instance = context.get(attrKey);
131 if (instance == null)
132 instance = new Attr(context);
133 return instance;
134 }
135
136 @SuppressWarnings("this-escape")
137 protected Attr(Context context) {
138 context.put(attrKey, this);
139
140 names = Names.instance(context);
141 log = Log.instance(context);
142 lintMapper = LintMapper.instance(context);
143 syms = Symtab.instance(context);
144 rs = Resolve.instance(context);
145 operators = Operators.instance(context);
146 chk = Check.instance(context);
147 flow = Flow.instance(context);
148 memberEnter = MemberEnter.instance(context);
149 typeEnter = TypeEnter.instance(context);
150 make = TreeMaker.instance(context);
151 enter = Enter.instance(context);
152 infer = Infer.instance(context);
153 analyzer = Analyzer.instance(context);
154 deferredAttr = DeferredAttr.instance(context);
155 cfolder = ConstFold.instance(context);
156 target = Target.instance(context);
157 types = Types.instance(context);
158 preview = Preview.instance(context);
159 diags = JCDiagnostic.Factory.instance(context);
160 annotate = Annotate.instance(context);
161 typeAnnotations = TypeAnnotations.instance(context);
162 typeEnvs = TypeEnvs.instance(context);
163 dependencies = Dependencies.instance(context);
164 argumentAttr = ArgumentAttr.instance(context);
165 matchBindingsComputer = MatchBindingsComputer.instance(context);
166 attrRecover = AttrRecover.instance(context);
167 localProxyVarsGen = LocalProxyVarsGen.instance(context);
168
169 Options options = Options.instance(context);
170
171 Source source = Source.instance(context);
172 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
173 allowRecords = Feature.RECORDS.allowedInSource(source);
174 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
175 Feature.PATTERN_SWITCH.allowedInSource(source);
176 allowUnconditionalPatternsInstanceOf =
177 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
178 sourceName = source.name;
179 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
180
181 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
182 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
183 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
184 methodAttrInfo = new MethodAttrInfo();
185 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
186 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
187 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
188 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
189 allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
190 Feature.VALUE_CLASSES.allowedInSource(source);
191 }
192
193 /** Switch: reifiable types in instanceof enabled?
194 */
195 boolean allowReifiableTypesInInstanceof;
196
197 /** Are records allowed
198 */
199 private final boolean allowRecords;
200
201 /** Are patterns in switch allowed
202 */
203 private final boolean allowPatternSwitch;
204
205 /** Are unconditional patterns in instanceof allowed
206 */
207 private final boolean allowUnconditionalPatternsInstanceOf;
208
209 /** Are value classes allowed
210 */
211 private final boolean allowValueClasses;
212
213 /**
214 * Switch: warn about use of variable before declaration?
215 * RFE: 6425594
216 */
217 boolean useBeforeDeclarationWarning;
218
219 /**
220 * Switch: name of source level; used for error reporting.
221 */
222 String sourceName;
223
224 /** Check kind and type of given tree against protokind and prototype.
225 * If check succeeds, store type in tree and return it.
226 * If check fails, store errType in tree and return it.
227 * No checks are performed if the prototype is a method type.
228 * It is not necessary in this case since we know that kind and type
229 * are correct.
230 *
231 * @param tree The tree whose kind and type is checked
232 * @param found The computed type of the tree
233 * @param ownkind The computed kind of the tree
234 * @param resultInfo The expected result of the tree
235 */
236 Type check(final JCTree tree,
237 final Type found,
238 final KindSelector ownkind,
239 final ResultInfo resultInfo) {
240 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
241 Type owntype;
242 boolean shouldCheck = !found.hasTag(ERROR) &&
243 !resultInfo.pt.hasTag(METHOD) &&
244 !resultInfo.pt.hasTag(FORALL);
245 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
246 log.error(tree.pos(),
247 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
248 ownkind.kindNames()));
249 owntype = types.createErrorType(found);
250 } else if (inferenceContext.free(found)) {
251 //delay the check if there are inference variables in the found type
252 //this means we are dealing with a partially inferred poly expression
253 owntype = shouldCheck ? resultInfo.pt : found;
254 if (resultInfo.checkMode.installPostInferenceHook()) {
255 inferenceContext.addFreeTypeListener(List.of(found),
256 instantiatedContext -> {
257 ResultInfo pendingResult =
258 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
259 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
260 });
261 }
262 } else {
263 owntype = shouldCheck ?
264 resultInfo.check(tree, found) :
265 found;
266 }
267 if (resultInfo.checkMode.updateTreeType()) {
268 tree.type = owntype;
269 }
270 return owntype;
271 }
272
273 /** Is given blank final variable assignable, i.e. in a scope where it
274 * may be assigned to even though it is final?
275 * @param v The blank final variable.
276 * @param env The current environment.
277 */
278 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
279 Symbol owner = env.info.scope.owner;
280 // owner refers to the innermost variable, method or
281 // initializer block declaration at this point.
282 boolean isAssignable =
283 v.owner == owner
284 ||
285 ((owner.name == names.init || // i.e. we are in a constructor
286 owner.kind == VAR || // i.e. we are in a variable initializer
287 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
288 &&
289 v.owner == owner.owner
290 &&
291 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
292 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
293 return isAssignable & !insideCompactConstructor;
294 }
295
296 /** Check that variable can be assigned to.
297 * @param pos The current source code position.
298 * @param v The assigned variable
299 * @param base If the variable is referred to in a Select, the part
300 * to the left of the `.', null otherwise.
301 * @param env The current environment.
302 */
303 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
304 if (v.name == names._this) {
305 log.error(pos, Errors.CantAssignValToThis);
306 } else if ((v.flags() & FINAL) != 0 &&
307 ((v.flags() & HASINIT) != 0
308 ||
309 !((base == null ||
310 TreeInfo.isThisQualifier(base)) &&
311 isAssignableAsBlankFinal(v, env)))) {
312 if (v.isResourceVariable()) { //TWR resource
313 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
314 } else {
315 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
316 }
317 }
318 }
319
320 /** Does tree represent a static reference to an identifier?
321 * It is assumed that tree is either a SELECT or an IDENT.
322 * We have to weed out selects from non-type names here.
323 * @param tree The candidate tree.
324 */
325 boolean isStaticReference(JCTree tree) {
326 if (tree.hasTag(SELECT)) {
327 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
328 if (lsym == null || lsym.kind != TYP) {
329 return false;
330 }
331 }
332 return true;
333 }
334
335 /** Is this symbol a type?
336 */
337 static boolean isType(Symbol sym) {
338 return sym != null && sym.kind == TYP;
339 }
340
341 /** Attribute a parsed identifier.
342 * @param tree Parsed identifier name
343 * @param topLevel The toplevel to use
344 */
345 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
346 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
347 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
348 syms.errSymbol.name,
349 null, null, null, null);
350 localEnv.enclClass.sym = syms.errSymbol;
351 return attribIdent(tree, localEnv);
352 }
353
354 /** Attribute a parsed identifier.
355 * @param tree Parsed identifier name
356 * @param env The env to use
357 */
358 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
359 return tree.accept(identAttributer, env);
360 }
361 // where
362 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
363 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
364 @Override @DefinedBy(Api.COMPILER_TREE)
365 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
366 Symbol site = visit(node.getExpression(), env);
367 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
368 return site;
369 Name name = (Name)node.getIdentifier();
370 if (site.kind == PCK) {
371 env.toplevel.packge = (PackageSymbol)site;
372 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
373 KindSelector.TYP_PCK);
374 } else {
375 env.enclClass.sym = (ClassSymbol)site;
376 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
377 }
378 }
379
380 @Override @DefinedBy(Api.COMPILER_TREE)
381 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
382 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
383 }
384 }
385
386 public Type coerce(Type etype, Type ttype) {
387 return cfolder.coerce(etype, ttype);
388 }
389
390 public Type attribType(JCTree node, TypeSymbol sym) {
391 Env<AttrContext> env = typeEnvs.get(sym);
392 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
393 return attribTree(node, localEnv, unknownTypeInfo);
394 }
395
396 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
397 // Attribute qualifying package or class.
398 JCFieldAccess s = tree.qualid;
399 return attribTree(s.selected, env,
400 new ResultInfo(tree.staticImport ?
401 KindSelector.TYP : KindSelector.TYP_PCK,
402 Type.noType));
403 }
404
405 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
406 return attribToTree(expr, env, tree, unknownExprInfo);
407 }
408
409 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
410 return attribToTree(stmt, env, tree, statInfo);
411 }
412
413 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
414 breakTree = tree;
415 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
416 try {
417 deferredAttr.attribSpeculative(root, env, resultInfo,
418 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
419 argumentAttr.withLocalCacheContext());
420 attrRecover.doRecovery();
421 } catch (BreakAttr b) {
422 return b.env;
423 } catch (AssertionError ae) {
424 if (ae.getCause() instanceof BreakAttr breakAttr) {
425 return breakAttr.env;
426 } else {
427 throw ae;
428 }
429 } finally {
430 breakTree = null;
431 log.useSource(prev);
432 }
433 return env;
434 }
435
436 private JCTree breakTree = null;
437
438 private static class BreakAttr extends RuntimeException {
439 static final long serialVersionUID = -6924771130405446405L;
440 private transient Env<AttrContext> env;
441 private BreakAttr(Env<AttrContext> env) {
442 this.env = env;
443 }
444 }
445
446 /**
447 * Mode controlling behavior of Attr.Check
448 */
449 enum CheckMode {
450
451 NORMAL,
452
453 /**
454 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
455 * that the captured var cache in {@code InferenceContext} will be used in read-only
456 * mode when performing inference checks.
457 */
458 NO_TREE_UPDATE {
459 @Override
460 public boolean updateTreeType() {
461 return false;
462 }
463 },
464 /**
465 * Mode signalling that caller will manage free types in tree decorations.
466 */
467 NO_INFERENCE_HOOK {
468 @Override
469 public boolean installPostInferenceHook() {
470 return false;
471 }
472 };
473
474 public boolean updateTreeType() {
475 return true;
476 }
477 public boolean installPostInferenceHook() {
478 return true;
479 }
480 }
481
482
483 class ResultInfo {
484 final KindSelector pkind;
485 final Type pt;
486 final CheckContext checkContext;
487 final CheckMode checkMode;
488
489 ResultInfo(KindSelector pkind, Type pt) {
490 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
491 }
492
493 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
494 this(pkind, pt, chk.basicHandler, checkMode);
495 }
496
497 protected ResultInfo(KindSelector pkind,
498 Type pt, CheckContext checkContext) {
499 this(pkind, pt, checkContext, CheckMode.NORMAL);
500 }
501
502 protected ResultInfo(KindSelector pkind,
503 Type pt, CheckContext checkContext, CheckMode checkMode) {
504 this.pkind = pkind;
505 this.pt = pt;
506 this.checkContext = checkContext;
507 this.checkMode = checkMode;
508 }
509
510 /**
511 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
512 * @param tree The tree to be type-checked.
513 * @return true if {@code ArgumentAttr} should be used.
514 */
515 protected boolean needsArgumentAttr(JCTree tree) { return false; }
516
517 protected Type check(final DiagnosticPosition pos, final Type found) {
518 return chk.checkType(pos, found, pt, checkContext);
519 }
520
521 protected ResultInfo dup(Type newPt) {
522 return new ResultInfo(pkind, newPt, checkContext, checkMode);
523 }
524
525 protected ResultInfo dup(CheckContext newContext) {
526 return new ResultInfo(pkind, pt, newContext, checkMode);
527 }
528
529 protected ResultInfo dup(Type newPt, CheckContext newContext) {
530 return new ResultInfo(pkind, newPt, newContext, checkMode);
531 }
532
533 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
534 return new ResultInfo(pkind, newPt, newContext, newMode);
535 }
536
537 protected ResultInfo dup(CheckMode newMode) {
538 return new ResultInfo(pkind, pt, checkContext, newMode);
539 }
540
541 @Override
542 public String toString() {
543 if (pt != null) {
544 return pt.toString();
545 } else {
546 return "";
547 }
548 }
549 }
550
551 class MethodAttrInfo extends ResultInfo {
552 public MethodAttrInfo() {
553 this(chk.basicHandler);
554 }
555
556 public MethodAttrInfo(CheckContext checkContext) {
557 super(KindSelector.VAL, Infer.anyPoly, checkContext);
558 }
559
560 @Override
561 protected boolean needsArgumentAttr(JCTree tree) {
562 return true;
563 }
564
565 protected ResultInfo dup(Type newPt) {
566 throw new IllegalStateException();
567 }
568
569 protected ResultInfo dup(CheckContext newContext) {
570 return new MethodAttrInfo(newContext);
571 }
572
573 protected ResultInfo dup(Type newPt, CheckContext newContext) {
574 throw new IllegalStateException();
575 }
576
577 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
578 throw new IllegalStateException();
579 }
580
581 protected ResultInfo dup(CheckMode newMode) {
582 throw new IllegalStateException();
583 }
584 }
585
586 class RecoveryInfo extends ResultInfo {
587
588 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
589 this(deferredAttrContext, Type.recoveryType);
590 }
591
592 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
593 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
594 @Override
595 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
596 return deferredAttrContext;
597 }
598 @Override
599 public boolean compatible(Type found, Type req, Warner warn) {
600 return true;
601 }
602 @Override
603 public void report(DiagnosticPosition pos, JCDiagnostic details) {
604 boolean needsReport = pt == Type.recoveryType ||
605 (details.getDiagnosticPosition() != null &&
606 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
607 if (needsReport) {
608 chk.basicHandler.report(pos, details);
609 }
610 }
611 });
612 }
613 }
614
615 final ResultInfo statInfo;
616 final ResultInfo varAssignmentInfo;
617 final ResultInfo methodAttrInfo;
618 final ResultInfo unknownExprInfo;
619 final ResultInfo unknownTypeInfo;
620 final ResultInfo unknownTypeExprInfo;
621 final ResultInfo recoveryInfo;
622 final MethodType initBlockType;
623
624 Type pt() {
625 return resultInfo.pt;
626 }
627
628 KindSelector pkind() {
629 return resultInfo.pkind;
630 }
631
632 /* ************************************************************************
633 * Visitor methods
634 *************************************************************************/
635
636 /** Visitor argument: the current environment.
637 */
638 Env<AttrContext> env;
639
640 /** Visitor argument: the currently expected attribution result.
641 */
642 ResultInfo resultInfo;
643
644 /** Visitor result: the computed type.
645 */
646 Type result;
647
648 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
649
650 /** Visitor method: attribute a tree, catching any completion failure
651 * exceptions. Return the tree's type.
652 *
653 * @param tree The tree to be visited.
654 * @param env The environment visitor argument.
655 * @param resultInfo The result info visitor argument.
656 */
657 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
658 Env<AttrContext> prevEnv = this.env;
659 ResultInfo prevResult = this.resultInfo;
660 try {
661 this.env = env;
662 this.resultInfo = resultInfo;
663 if (resultInfo.needsArgumentAttr(tree)) {
664 result = argumentAttr.attribArg(tree, env);
665 } else {
666 tree.accept(this);
667 }
668 matchBindings = matchBindingsComputer.finishBindings(tree,
669 matchBindings);
670 if (tree == breakTree &&
671 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
672 breakTreeFound(copyEnv(env));
673 }
674 return result;
675 } catch (CompletionFailure ex) {
676 tree.type = syms.errType;
677 return chk.completionError(tree.pos(), ex);
678 } finally {
679 this.env = prevEnv;
680 this.resultInfo = prevResult;
681 }
682 }
683
684 protected void breakTreeFound(Env<AttrContext> env) {
685 throw new BreakAttr(env);
686 }
687
688 Env<AttrContext> copyEnv(Env<AttrContext> env) {
689 Env<AttrContext> newEnv =
690 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
691 if (newEnv.outer != null) {
692 newEnv.outer = copyEnv(newEnv.outer);
693 }
694 return newEnv;
695 }
696
697 WriteableScope copyScope(WriteableScope sc) {
698 WriteableScope newScope = WriteableScope.create(sc.owner);
699 List<Symbol> elemsList = List.nil();
700 for (Symbol sym : sc.getSymbols()) {
701 elemsList = elemsList.prepend(sym);
702 }
703 for (Symbol s : elemsList) {
704 newScope.enter(s);
705 }
706 return newScope;
707 }
708
709 /** Derived visitor method: attribute an expression tree.
710 */
711 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
712 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
713 }
714
715 /** Derived visitor method: attribute an expression tree with
716 * no constraints on the computed type.
717 */
718 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
719 return attribTree(tree, env, unknownExprInfo);
720 }
721
722 /** Derived visitor method: attribute a type tree.
723 */
724 public Type attribType(JCTree tree, Env<AttrContext> env) {
725 Type result = attribType(tree, env, Type.noType);
726 return result;
727 }
728
729 /** Derived visitor method: attribute a type tree.
730 */
731 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
732 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
733 return result;
734 }
735
736 /** Derived visitor method: attribute a statement or definition tree.
737 */
738 public Type attribStat(JCTree tree, Env<AttrContext> env) {
739 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
740 Type result = attribTree(tree, env, statInfo);
741 analyzer.analyzeIfNeeded(tree, analyzeEnv);
742 attrRecover.doRecovery();
743 return result;
744 }
745
746 /** Attribute a list of expressions, returning a list of types.
747 */
748 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
749 ListBuffer<Type> ts = new ListBuffer<>();
750 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
751 ts.append(attribExpr(l.head, env, pt));
752 return ts.toList();
753 }
754
755 /** Attribute a list of statements, returning nothing.
756 */
757 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
758 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
759 attribStat(l.head, env);
760 }
761
762 /** Attribute the arguments in a method call, returning the method kind.
763 */
764 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
765 KindSelector kind = initialKind;
766 for (JCExpression arg : trees) {
767 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
768 if (argtype.hasTag(DEFERRED)) {
769 kind = KindSelector.of(KindSelector.POLY, kind);
770 }
771 argtypes.append(argtype);
772 }
773 return kind;
774 }
775
776 /** Attribute a type argument list, returning a list of types.
777 * Caller is responsible for calling checkRefTypes.
778 */
779 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
780 ListBuffer<Type> argtypes = new ListBuffer<>();
781 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
782 argtypes.append(attribType(l.head, env));
783 return argtypes.toList();
784 }
785
786 /** Attribute a type argument list, returning a list of types.
787 * Check that all the types are references.
788 */
789 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
790 List<Type> types = attribAnyTypes(trees, env);
791 return chk.checkRefTypes(trees, types);
792 }
793
794 /**
795 * Attribute type variables (of generic classes or methods).
796 * Compound types are attributed later in attribBounds.
797 * @param typarams the type variables to enter
798 * @param env the current environment
799 */
800 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
801 for (JCTypeParameter tvar : typarams) {
802 TypeVar a = (TypeVar)tvar.type;
803 a.tsym.flags_field |= UNATTRIBUTED;
804 a.setUpperBound(Type.noType);
805 if (!tvar.bounds.isEmpty()) {
806 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
807 for (JCExpression bound : tvar.bounds.tail)
808 bounds = bounds.prepend(attribType(bound, env));
809 types.setBounds(a, bounds.reverse());
810 } else {
811 // if no bounds are given, assume a single bound of
812 // java.lang.Object.
813 types.setBounds(a, List.of(syms.objectType));
814 }
815 a.tsym.flags_field &= ~UNATTRIBUTED;
816 }
817 if (checkCyclic) {
818 for (JCTypeParameter tvar : typarams) {
819 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
820 }
821 }
822 }
823
824 /**
825 * Attribute the type references in a list of annotations.
826 */
827 void attribAnnotationTypes(List<JCAnnotation> annotations,
828 Env<AttrContext> env) {
829 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
830 JCAnnotation a = al.head;
831 attribType(a.annotationType, env);
832 }
833 }
834
835 /**
836 * Attribute a "lazy constant value".
837 * @param env The env for the const value
838 * @param variable The initializer for the const value
839 * @param type The expected type, or null
840 * @see VarSymbol#setLazyConstValue
841 */
842 public Object attribLazyConstantValue(Env<AttrContext> env,
843 Env<AttrContext> enclosingEnv,
844 JCVariableDecl variable,
845 Type type) {
846 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
847 try {
848 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
849 Type itype = attribExpr(variable.init, env, type);
850 if (variable.isImplicitlyTyped()) {
851 //fixup local variable type
852 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
853 }
854 if (itype.constValue() != null) {
855 return coerce(itype, type).constValue();
856 } else {
857 return null;
858 }
859 } finally {
860 log.useSource(prevSource);
861 }
862 }
863
864 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
865 * Supertypes of anonymous inner classes are usually already attributed.
866 *
867 * @param tree The tree making up the type reference.
868 * @param env The environment current at the reference.
869 * @param classExpected true if only a class is expected here.
870 * @param interfaceExpected true if only an interface is expected here.
871 */
872 Type attribBase(JCTree tree,
873 Env<AttrContext> env,
874 boolean classExpected,
875 boolean interfaceExpected,
876 boolean checkExtensible) {
877 Type t = tree.type != null ?
878 tree.type :
879 attribType(tree, env);
880 try {
881 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
882 } catch (CompletionFailure ex) {
883 chk.completionError(tree.pos(), ex);
884 return t;
885 }
886 }
887 Type checkBase(Type t,
888 JCTree tree,
889 Env<AttrContext> env,
890 boolean classExpected,
891 boolean interfaceExpected,
892 boolean checkExtensible) {
893 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
894 (((JCTypeApply) tree).clazz).pos() : tree.pos();
895 if (t.tsym.isAnonymous()) {
896 log.error(pos, Errors.CantInheritFromAnon);
897 return types.createErrorType(t);
898 }
899 if (t.isErroneous())
900 return t;
901 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
902 // check that type variable is already visible
903 if (t.getUpperBound() == null) {
904 log.error(pos, Errors.IllegalForwardRef);
905 return types.createErrorType(t);
906 }
907 } else {
908 t = chk.checkClassType(pos, t, checkExtensible);
909 }
910 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
911 log.error(pos, Errors.IntfExpectedHere);
912 // return errType is necessary since otherwise there might
913 // be undetected cycles which cause attribution to loop
914 return types.createErrorType(t);
915 } else if (checkExtensible &&
916 classExpected &&
917 (t.tsym.flags() & INTERFACE) != 0) {
918 log.error(pos, Errors.NoIntfExpectedHere);
919 return types.createErrorType(t);
920 }
921 if (checkExtensible &&
922 ((t.tsym.flags() & FINAL) != 0)) {
923 log.error(pos,
924 Errors.CantInheritFromFinal(t.tsym));
925 }
926 chk.checkNonCyclic(pos, t);
927 return t;
928 }
929
930 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
931 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
932 id.type = env.info.scope.owner.enclClass().type;
933 id.sym = env.info.scope.owner.enclClass();
934 return id.type;
935 }
936
937 public void visitClassDef(JCClassDecl tree) {
938 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
939 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
940 argumentAttr.withLocalCacheContext() : null);
941 boolean ctorProloguePrev = env.info.ctorPrologue;
942 try {
943 // Local and anonymous classes have not been entered yet, so we need to
944 // do it now.
945 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
946 enter.classEnter(tree, env);
947 } else {
948 // If this class declaration is part of a class level annotation,
949 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
950 // order to simplify later steps and allow for sensible error
951 // messages.
952 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
953 enter.classEnter(tree, env);
954 }
955
956 ClassSymbol c = tree.sym;
957 if (c == null) {
958 // exit in case something drastic went wrong during enter.
959 result = null;
960 } else {
961 // make sure class has been completed:
962 c.complete();
963
964 // If a class declaration appears in a constructor prologue,
965 // that means it's either a local class or an anonymous class.
966 // Either way, there is no immediately enclosing instance.
967 if (ctorProloguePrev) {
968 c.flags_field |= NOOUTERTHIS;
969 }
970 attribClass(tree.pos(), c);
971 result = tree.type = c.type;
972 }
973 } finally {
974 localCacheContext.ifPresent(LocalCacheContext::leave);
975 env.info.ctorPrologue = ctorProloguePrev;
976 }
977 }
978
979 public void visitMethodDef(JCMethodDecl tree) {
980 MethodSymbol m = tree.sym;
981 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
982
983 Lint lint = env.info.lint.augment(m);
984 Lint prevLint = chk.setLint(lint);
985 boolean ctorProloguePrev = env.info.ctorPrologue;
986 Assert.check(!env.info.ctorPrologue);
987 MethodSymbol prevMethod = chk.setMethod(m);
988 try {
989 chk.checkDeprecatedAnnotation(tree.pos(), m);
990
991
992 // Create a new environment with local scope
993 // for attributing the method.
994 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
995 localEnv.info.lint = lint;
996
997 attribStats(tree.typarams, localEnv);
998
999 // If we override any other methods, check that we do so properly.
1000 // JLS ???
1001 if (m.isStatic()) {
1002 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1003 } else {
1004 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1005 }
1006 chk.checkOverride(env, tree, m);
1007
1008 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1009 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1010 }
1011
1012 // Enter all type parameters into the local method scope.
1013 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1014 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1015
1016 ClassSymbol owner = env.enclClass.sym;
1017 if ((owner.flags() & ANNOTATION) != 0 &&
1018 (tree.params.nonEmpty() ||
1019 tree.recvparam != null))
1020 log.error(tree.params.nonEmpty() ?
1021 tree.params.head.pos() :
1022 tree.recvparam.pos(),
1023 Errors.IntfAnnotationMembersCantHaveParams);
1024
1025 // Attribute all value parameters.
1026 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1027 attribStat(l.head, localEnv);
1028 }
1029
1030 chk.checkVarargsMethodDecl(localEnv, tree);
1031
1032 // Check that type parameters are well-formed.
1033 chk.validate(tree.typarams, localEnv);
1034
1035 // Check that result type is well-formed.
1036 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) {
1037 chk.validate(tree.restype, localEnv);
1038 }
1039 chk.checkRequiresIdentity(tree, env.info.lint);
1040
1041 // Check that receiver type is well-formed.
1042 if (tree.recvparam != null) {
1043 // Use a new environment to check the receiver parameter.
1044 // Otherwise I get "might not have been initialized" errors.
1045 // Is there a better way?
1046 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1047 attribType(tree.recvparam, newEnv);
1048 chk.validate(tree.recvparam, newEnv);
1049 }
1050
1051 // Is this method a constructor?
1052 boolean isConstructor = TreeInfo.isConstructor(tree);
1053
1054 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1055 // lets find if this method is an accessor
1056 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1057 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1058 if (recordComponent.isPresent()) {
1059 // the method is a user defined accessor lets check that everything is fine
1060 if (!tree.sym.isPublic()) {
1061 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1062 }
1063 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1064 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1065 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1066 }
1067 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1068 log.error(tree,
1069 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1070 }
1071 if (!tree.typarams.isEmpty()) {
1072 log.error(tree,
1073 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1074 }
1075 if (tree.sym.isStatic()) {
1076 log.error(tree,
1077 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1078 }
1079 }
1080
1081 if (isConstructor) {
1082 // if this a constructor other than the canonical one
1083 if ((tree.sym.flags_field & RECORD) == 0) {
1084 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1085 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1086 }
1087 } else {
1088 // but if it is the canonical:
1089
1090 /* if user generated, then it shouldn't:
1091 * - have an accessibility stricter than that of the record type
1092 * - explicitly invoke any other constructor
1093 */
1094 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1095 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1096 log.error(tree,
1097 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1098 Errors.InvalidCanonicalConstructorInRecord(
1099 Fragments.Canonical,
1100 env.enclClass.sym.name,
1101 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1102 ) :
1103 Errors.InvalidCanonicalConstructorInRecord(
1104 Fragments.Canonical,
1105 env.enclClass.sym.name,
1106 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1107 )
1108 );
1109 }
1110
1111 if (!allowValueClasses && TreeInfo.hasAnyConstructorCall(tree)) {
1112 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1113 Fragments.Canonical, env.enclClass.sym.name,
1114 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1115 }
1116 }
1117
1118 // also we want to check that no type variables have been defined
1119 if (!tree.typarams.isEmpty()) {
1120 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1121 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1122 }
1123
1124 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1125 * record components
1126 */
1127 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1128 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1129 for (JCVariableDecl param: tree.params) {
1130 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1131 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1132 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1133 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1134 Fragments.Canonical, env.enclClass.sym.name,
1135 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1136 }
1137 recordComponents = recordComponents.tail;
1138 recordFieldTypes = recordFieldTypes.tail;
1139 }
1140 }
1141 }
1142 }
1143
1144 // annotation method checks
1145 if ((owner.flags() & ANNOTATION) != 0) {
1146 // annotation method cannot have throws clause
1147 if (tree.thrown.nonEmpty()) {
1148 log.error(tree.thrown.head.pos(),
1149 Errors.ThrowsNotAllowedInIntfAnnotation);
1150 }
1151 // annotation method cannot declare type-parameters
1152 if (tree.typarams.nonEmpty()) {
1153 log.error(tree.typarams.head.pos(),
1154 Errors.IntfAnnotationMembersCantHaveTypeParams);
1155 }
1156 // validate annotation method's return type (could be an annotation type)
1157 chk.validateAnnotationType(tree.restype);
1158 // ensure that annotation method does not clash with members of Object/Annotation
1159 chk.validateAnnotationMethod(tree.pos(), m);
1160 }
1161
1162 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1163 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1164
1165 if (tree.body == null) {
1166 // Empty bodies are only allowed for
1167 // abstract, native, or interface methods, or for methods
1168 // in a retrofit signature class.
1169 if (tree.defaultValue != null) {
1170 if ((owner.flags() & ANNOTATION) == 0)
1171 log.error(tree.pos(),
1172 Errors.DefaultAllowedInIntfAnnotationMember);
1173 }
1174 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1175 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract(tree.sym, owner));
1176 } else {
1177 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1178 if ((owner.flags() & INTERFACE) != 0) {
1179 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1180 } else {
1181 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1182 }
1183 } else if ((tree.mods.flags & NATIVE) != 0) {
1184 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1185 }
1186 // Add an implicit super() call unless an explicit call to
1187 // super(...) or this(...) is given
1188 // or we are compiling class java.lang.Object.
1189 boolean addedSuperInIdentityClass = false;
1190 if (isConstructor && owner.type != syms.objectType) {
1191 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1192 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1193 make.Ident(names._super), make.Idents(List.nil())));
1194 if (allowValueClasses && (owner.isValueClass() || owner.hasStrict() || ((owner.flags_field & RECORD) != 0))) {
1195 tree.body.stats = tree.body.stats.append(supCall);
1196 } else {
1197 tree.body.stats = tree.body.stats.prepend(supCall);
1198 addedSuperInIdentityClass = true;
1199 }
1200 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1201 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1202 TreeInfo.hasConstructorCall(tree, names._super)) {
1203 // enum constructors are not allowed to call super
1204 // directly, so make sure there aren't any super calls
1205 // in enum constructors, except in the compiler
1206 // generated one.
1207 log.error(tree.body.stats.head.pos(),
1208 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1209 }
1210 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1211 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1212 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1213 if (!initParamNames.equals(recordComponentNames)) {
1214 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1215 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1216 }
1217 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1218 log.error(tree,
1219 Errors.InvalidCanonicalConstructorInRecord(
1220 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1221 env.enclClass.sym.name,
1222 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1223 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1224 }
1225 }
1226 }
1227
1228 // Attribute all type annotations in the body
1229 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1230 annotate.flush();
1231
1232 // Start of constructor prologue (if not in java.lang.Object constructor)
1233 localEnv.info.ctorPrologue = isConstructor && owner.type != syms.objectType;
1234
1235 // Attribute method body.
1236 attribStat(tree.body, localEnv);
1237 if (localEnv.info.ctorPrologue) {
1238 boolean thisInvocation = false;
1239 ListBuffer<JCTree> prologueCode = new ListBuffer<>();
1240 for (JCTree stat : tree.body.stats) {
1241 prologueCode.add(stat);
1242 /* gather all the stats in the body until a `super` or `this` constructor invocation is found,
1243 * including the constructor invocation, that way we don't need to worry in the visitor below if
1244 * if we are dealing or not with prologue code
1245 */
1246 if (stat instanceof JCExpressionStatement expStmt &&
1247 expStmt.expr instanceof JCMethodInvocation mi &&
1248 TreeInfo.isConstructorCall(mi)) {
1249 thisInvocation = TreeInfo.name(mi.meth) == names._this;
1250 if (!addedSuperInIdentityClass || !allowValueClasses) {
1251 break;
1252 }
1253 }
1254 }
1255 if (!prologueCode.isEmpty()) {
1256 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(localEnv,
1257 addedSuperInIdentityClass && allowValueClasses ?
1258 PrologueVisitorMode.WARNINGS_ONLY :
1259 thisInvocation ?
1260 PrologueVisitorMode.THIS_CONSTRUCTOR :
1261 PrologueVisitorMode.SUPER_CONSTRUCTOR,
1262 false);
1263 ctorPrologueVisitor.scan(prologueCode.toList());
1264 }
1265 }
1266 }
1267
1268 localEnv.info.scope.leave();
1269 result = tree.type = m.type;
1270 } finally {
1271 chk.setLint(prevLint);
1272 chk.setMethod(prevMethod);
1273 env.info.ctorPrologue = ctorProloguePrev;
1274 }
1275 }
1276
1277 enum PrologueVisitorMode {
1278 WARNINGS_ONLY,
1279 SUPER_CONSTRUCTOR,
1280 THIS_CONSTRUCTOR
1281 }
1282
1283 class CtorPrologueVisitor extends TreeScanner {
1284 Env<AttrContext> localEnv;
1285 PrologueVisitorMode mode;
1286 boolean isInitializer;
1287
1288 CtorPrologueVisitor(Env<AttrContext> localEnv, PrologueVisitorMode mode, boolean isInitializer) {
1289 this.localEnv = localEnv;
1290 currentClassSym = localEnv.enclClass.sym;
1291 this.mode = mode;
1292 this.isInitializer = isInitializer;
1293 }
1294
1295 boolean insideLambdaOrClassDef = false;
1296
1297 @Override
1298 public void visitLambda(JCLambda lambda) {
1299 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1300 try {
1301 insideLambdaOrClassDef = true;
1302 super.visitLambda(lambda);
1303 } finally {
1304 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1305 }
1306 }
1307
1308 ClassSymbol currentClassSym;
1309
1310 @Override
1311 public void visitClassDef(JCClassDecl classDecl) {
1312 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1313 ClassSymbol previousClassSym = currentClassSym;
1314 try {
1315 insideLambdaOrClassDef = true;
1316 currentClassSym = classDecl.sym;
1317 super.visitClassDef(classDecl);
1318 } finally {
1319 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1320 currentClassSym = previousClassSym;
1321 }
1322 }
1323
1324 private void reportPrologueError(JCTree tree, Symbol sym) {
1325 reportPrologueError(tree, sym, false);
1326 }
1327
1328 private void reportPrologueError(JCTree tree, Symbol sym, boolean hasInit) {
1329 preview.checkSourceLevel(tree, Feature.FLEXIBLE_CONSTRUCTORS);
1330 if (mode != PrologueVisitorMode.WARNINGS_ONLY) {
1331 if (hasInit) {
1332 log.error(tree, Errors.CantAssignInitializedBeforeCtorCalled(sym));
1333 } else {
1334 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1335 }
1336 } else if (allowValueClasses) {
1337 // issue lint warning
1338 log.warning(tree, LintWarnings.WouldNotBeAllowedInPrologue(sym));
1339 }
1340 }
1341
1342 @Override
1343 public void visitApply(JCMethodInvocation tree) {
1344 super.visitApply(tree);
1345 Name name = TreeInfo.name(tree.meth);
1346 boolean isConstructorCall = name == names._this || name == names._super;
1347 Symbol msym = TreeInfo.symbolFor(tree.meth);
1348 // is this an instance method call or an illegal constructor invocation like: `this.super()`?
1349 if (msym != null && // for erroneous invocations msym can be null, ignore those
1350 (!isConstructorCall ||
1351 isConstructorCall && tree.meth.hasTag(SELECT))) {
1352 if (isEarlyReference(localEnv, tree.meth, msym))
1353 reportPrologueError(tree.meth, msym);
1354 }
1355 }
1356
1357 @Override
1358 public void visitIdent(JCIdent tree) {
1359 analyzeSymbol(tree);
1360 }
1361
1362 boolean isIndexed = false;
1363
1364 @Override
1365 public void visitIndexed(JCArrayAccess tree) {
1366 boolean previousIsIndexed = isIndexed;
1367 try {
1368 isIndexed = true;
1369 scan(tree.indexed);
1370 } finally {
1371 isIndexed = previousIsIndexed;
1372 }
1373 scan(tree.index);
1374 if (mode == PrologueVisitorMode.SUPER_CONSTRUCTOR && isInstanceField(tree.indexed)) {
1375 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, TreeInfo.symbolFor(tree.indexed));
1376 }
1377 }
1378
1379 @Override
1380 public void visitSelect(JCFieldAccess tree) {
1381 SelectScanner ss = new SelectScanner();
1382 ss.scan(tree);
1383 if (ss.scanLater == null) {
1384 Symbol sym = TreeInfo.symbolFor(tree);
1385 // if this is a field access
1386 if (sym.kind == VAR && sym.owner.kind == TYP) {
1387 // Type.super.field or super.field expressions are forbidden in early construction contexts
1388 for (JCTree subtree : ss.selectorTrees) {
1389 if (TreeInfo.isSuperOrSelectorDotSuper(subtree)) {
1390 reportPrologueError(tree, sym);
1391 return;
1392 }
1393 }
1394 }
1395 analyzeSymbol(tree);
1396 } else {
1397 boolean prevLhs = isInLHS;
1398 try {
1399 isInLHS = false;
1400 scan(ss.scanLater);
1401 } finally {
1402 isInLHS = prevLhs;
1403 }
1404 }
1405 if (mode == PrologueVisitorMode.SUPER_CONSTRUCTOR) {
1406 for (JCTree subtree : ss.selectorTrees) {
1407 if (isInstanceField(subtree)) {
1408 // we need to add a proxy for this one
1409 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, TreeInfo.symbolFor(subtree));
1410 }
1411 }
1412 }
1413 }
1414
1415 boolean isInstanceField(JCTree tree) {
1416 Symbol sym = TreeInfo.symbolFor(tree);
1417 return (sym != null &&
1418 !sym.isStatic() &&
1419 sym.kind == VAR &&
1420 sym.owner.kind == TYP &&
1421 sym.name != names._this &&
1422 sym.name != names._super &&
1423 isEarlyReference(localEnv, tree, sym));
1424 }
1425
1426 @Override
1427 public void visitNewClass(JCNewClass tree) {
1428 super.visitNewClass(tree);
1429 checkNewClassAndMethRefs(tree, tree.type);
1430 }
1431
1432 @Override
1433 public void visitReference(JCMemberReference tree) {
1434 super.visitReference(tree);
1435 if (tree.getMode() == JCMemberReference.ReferenceMode.NEW) {
1436 checkNewClassAndMethRefs(tree, tree.expr.type);
1437 }
1438 }
1439
1440 void checkNewClassAndMethRefs(JCTree tree, Type t) {
1441 if (t.tsym.isEnclosedBy(localEnv.enclClass.sym) &&
1442 !t.tsym.isStatic() &&
1443 !t.tsym.isDirectlyOrIndirectlyLocal()) {
1444 reportPrologueError(tree, t.getEnclosingType().tsym);
1445 }
1446 }
1447
1448 /* if a symbol is in the LHS of an assignment expression we won't consider it as a candidate
1449 * for a proxy local variable later on
1450 */
1451 boolean isInLHS = false;
1452
1453 @Override
1454 public void visitAssign(JCAssign tree) {
1455 boolean previousIsInLHS = isInLHS;
1456 try {
1457 isInLHS = true;
1458 scan(tree.lhs);
1459 } finally {
1460 isInLHS = previousIsInLHS;
1461 }
1462 scan(tree.rhs);
1463 }
1464
1465 @Override
1466 public void visitMethodDef(JCMethodDecl tree) {
1467 // ignore any declarative part, mainly to avoid scanning receiver parameters
1468 scan(tree.body);
1469 }
1470
1471 void analyzeSymbol(JCTree tree) {
1472 Symbol sym = TreeInfo.symbolFor(tree);
1473 // make sure that there is a symbol and it is not static
1474 if (sym == null || sym.isStatic()) {
1475 return;
1476 }
1477 if (isInLHS && !insideLambdaOrClassDef) {
1478 // Check instance field assignments that appear in constructor prologues
1479 if (isEarlyReference(localEnv, tree, sym)) {
1480 // Field may not be inherited from a superclass
1481 if (sym.owner != localEnv.enclClass.sym) {
1482 reportPrologueError(tree, sym);
1483 return;
1484 }
1485 // Field may not have an initializer
1486 if ((sym.flags() & HASINIT) != 0) {
1487 if (!localEnv.enclClass.sym.isValueClass() || !sym.type.hasTag(ARRAY) || !isIndexed) {
1488 reportPrologueError(tree, sym, true);
1489 }
1490 return;
1491 }
1492 // cant reference an instance field before a this constructor
1493 if (allowValueClasses && mode == PrologueVisitorMode.THIS_CONSTRUCTOR) {
1494 reportPrologueError(tree, sym);
1495 return;
1496 }
1497 }
1498 return;
1499 }
1500 tree = TreeInfo.skipParens(tree);
1501 if (sym.kind == VAR && sym.owner.kind == TYP) {
1502 if (sym.name == names._this || sym.name == names._super) {
1503 // are we seeing something like `this` or `CurrentClass.this` or `SuperClass.super::foo`?
1504 if (TreeInfo.isExplicitThisReference(
1505 types,
1506 (ClassType)localEnv.enclClass.sym.type,
1507 tree)) {
1508 reportPrologueError(tree, sym);
1509 }
1510 } else if (sym.kind == VAR && sym.owner.kind == TYP) { // now fields only
1511 if (sym.owner != localEnv.enclClass.sym) {
1512 if (localEnv.enclClass.sym.isSubClass(sym.owner, types) &&
1513 sym.isInheritedIn(localEnv.enclClass.sym, types)) {
1514 /* if we are dealing with a field that doesn't belong to the current class, but the
1515 * field is inherited, this is an error. Unless, the super class is also an outer
1516 * class and the field's qualifier refers to the outer class
1517 */
1518 if (tree.hasTag(IDENT) ||
1519 TreeInfo.isExplicitThisReference(
1520 types,
1521 (ClassType)localEnv.enclClass.sym.type,
1522 ((JCFieldAccess)tree).selected)) {
1523 reportPrologueError(tree, sym);
1524 }
1525 }
1526 } else if (isEarlyReference(localEnv, tree, sym)) {
1527 /* now this is a `proper` instance field of the current class
1528 * references to fields of identity classes which happen to have initializers are
1529 * not allowed in the prologue.
1530 * But it is OK for a field with initializer to refer to another field with initializer,
1531 * so no warning or error if we are analyzing a field initializer.
1532 */
1533 if (insideLambdaOrClassDef ||
1534 (!localEnv.enclClass.sym.isValueClass() &&
1535 (sym.flags_field & HASINIT) != 0 &&
1536 !isInitializer))
1537 reportPrologueError(tree, sym);
1538 // we will need to generate a proxy for this field later on
1539 if (!isInLHS) {
1540 if (!allowValueClasses) {
1541 reportPrologueError(tree, sym);
1542 } else {
1543 if (mode == PrologueVisitorMode.THIS_CONSTRUCTOR) {
1544 reportPrologueError(tree, sym);
1545 } else if (mode == PrologueVisitorMode.SUPER_CONSTRUCTOR) {
1546 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, sym);
1547 }
1548 /* we do nothing in warnings only mode, as in that mode we are simulating what
1549 * the compiler would do in case the constructor code would be in the prologue
1550 * phase
1551 */
1552 }
1553 }
1554 }
1555 }
1556 }
1557 }
1558
1559 /**
1560 * Determine if the symbol appearance constitutes an early reference to the current class.
1561 *
1562 * <p>
1563 * This means the symbol is an instance field, or method, of the current class and it appears
1564 * in an early initialization context of it (i.e., one of its constructor prologues).
1565 *
1566 * @param env The current environment
1567 * @param tree the AST referencing the variable
1568 * @param sym The symbol
1569 */
1570 private boolean isEarlyReference(Env<AttrContext> env, JCTree tree, Symbol sym) {
1571 if ((sym.flags() & STATIC) == 0 &&
1572 (sym.kind == VAR || sym.kind == MTH) &&
1573 sym.isMemberOf(env.enclClass.sym, types)) {
1574 // Allow "Foo.this.x" when "Foo" is (also) an outer class, as this refers to the outer instance
1575 if (tree instanceof JCFieldAccess fa) {
1576 return TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, fa.selected);
1577 } else if (currentClassSym != env.enclClass.sym) {
1578 /* so we are inside a class, CI, in the prologue of an outer class, CO, and the symbol being
1579 * analyzed has no qualifier. So if the symbol is a member of CI the reference is allowed,
1580 * otherwise it is not.
1581 * It could be that the reference to CI's member happens inside CI's own prologue, but that
1582 * will be checked separately, when CI's prologue is analyzed.
1583 */
1584 return !sym.isMemberOf(currentClassSym, types);
1585 }
1586 return true;
1587 }
1588 return false;
1589 }
1590
1591 /* scanner for a select expression, anything that is not a select or identifier
1592 * will be stored for further analysis
1593 */
1594 class SelectScanner extends DeferredAttr.FilterScanner {
1595 JCTree scanLater;
1596 java.util.List<JCTree> selectorTrees = new ArrayList<>();
1597
1598 SelectScanner() {
1599 super(Set.of(IDENT, SELECT, PARENS));
1600 }
1601
1602 @Override
1603 public void visitSelect(JCFieldAccess tree) {
1604 super.visitSelect(tree);
1605 selectorTrees.add(tree.selected);
1606 }
1607
1608 @Override
1609 void skip(JCTree tree) {
1610 scanLater = tree;
1611 }
1612 }
1613 }
1614
1615 public void visitVarDef(JCVariableDecl tree) {
1616 // Local variables have not been entered yet, so we need to do it now:
1617 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1618 if (tree.sym != null) {
1619 // parameters have already been entered
1620 env.info.scope.enter(tree.sym);
1621 } else {
1622 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1623 if (tree.init == null) {
1624 //cannot use 'var' without initializer
1625 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1626 tree.vartype = make.at(tree.pos()).Erroneous();
1627 } else {
1628 Fragment msg = canInferLocalVarType(tree);
1629 if (msg != null) {
1630 //cannot use 'var' with initializer which require an explicit target
1631 //(e.g. lambda, method reference, array initializer).
1632 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1633 tree.vartype = make.at(tree.pos()).Erroneous();
1634 }
1635 }
1636 }
1637 try {
1638 annotate.blockAnnotations();
1639 memberEnter.memberEnter(tree, env);
1640 } finally {
1641 annotate.unblockAnnotations();
1642 }
1643 }
1644 } else {
1645 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1646 }
1647
1648 VarSymbol v = tree.sym;
1649 Lint lint = env.info.lint.augment(v);
1650 Lint prevLint = chk.setLint(lint);
1651
1652 // Check that the variable's declared type is well-formed.
1653 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1654 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1655 (tree.sym.flags() & PARAMETER) != 0;
1656 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1657
1658 try {
1659 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1660 chk.checkDeprecatedAnnotation(tree.pos(), v);
1661
1662 if (tree.init != null) {
1663 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1664 if ((v.flags_field & FINAL) == 0 ||
1665 !memberEnter.needsLazyConstValue(tree.init)) {
1666 // Not a compile-time constant
1667 // Attribute initializer in a new environment
1668 // with the declared variable as owner.
1669 // Check that initializer conforms to variable's declared type.
1670 initEnv.info.lint = lint;
1671 // In order to catch self-references, we set the variable's
1672 // declaration position to maximal possible value, effectively
1673 // marking the variable as undefined.
1674 initEnv.info.enclVar = v;
1675 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1676 try {
1677 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1678 // strict instance initializer in a value class
1679 initEnv.info.ctorPrologue = true;
1680 }
1681 attribExpr(tree.init, initEnv, v.type);
1682 if (tree.isImplicitlyTyped()) {
1683 //fixup local variable type
1684 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1685 }
1686 } finally {
1687 initEnv.info.ctorPrologue = previousCtorPrologue;
1688 }
1689 }
1690 if (allowValueClasses && v.owner.kind == TYP && !v.isStatic()) {
1691 // strict field initializers are inlined in constructor's prologues
1692 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(initEnv,
1693 !v.isStrict() ? PrologueVisitorMode.WARNINGS_ONLY : PrologueVisitorMode.SUPER_CONSTRUCTOR,
1694 true);
1695 ctorPrologueVisitor.scan(tree.init);
1696 }
1697 if (tree.isImplicitlyTyped()) {
1698 setSyntheticVariableType(tree, v.type);
1699 }
1700 }
1701 result = tree.type = v.type;
1702 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1703 if (isNonArgsMethodInObject(v.name)) {
1704 log.error(tree, Errors.IllegalRecordComponentName(v));
1705 }
1706 }
1707 chk.checkRequiresIdentity(tree, env.info.lint);
1708 }
1709 finally {
1710 chk.setLint(prevLint);
1711 }
1712 }
1713
1714 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1715 if (tree.init != null &&
1716 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1717 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1718 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1719 // Field initializer expression need to be entered.
1720 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym);
1721 annotate.flush();
1722 }
1723 }
1724
1725 private boolean isNonArgsMethodInObject(Name name) {
1726 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1727 if (s.type.getParameterTypes().isEmpty()) {
1728 return true;
1729 }
1730 }
1731 return false;
1732 }
1733
1734 Fragment canInferLocalVarType(JCVariableDecl tree) {
1735 LocalInitScanner lis = new LocalInitScanner();
1736 lis.scan(tree.init);
1737 return lis.badInferenceMsg;
1738 }
1739
1740 static class LocalInitScanner extends TreeScanner {
1741 Fragment badInferenceMsg = null;
1742 boolean needsTarget = true;
1743
1744 @Override
1745 public void visitNewArray(JCNewArray tree) {
1746 if (tree.elemtype == null && needsTarget) {
1747 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1748 }
1749 }
1750
1751 @Override
1752 public void visitLambda(JCLambda tree) {
1753 if (needsTarget) {
1754 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1755 }
1756 }
1757
1758 @Override
1759 public void visitTypeCast(JCTypeCast tree) {
1760 boolean prevNeedsTarget = needsTarget;
1761 try {
1762 needsTarget = false;
1763 super.visitTypeCast(tree);
1764 } finally {
1765 needsTarget = prevNeedsTarget;
1766 }
1767 }
1768
1769 @Override
1770 public void visitReference(JCMemberReference tree) {
1771 if (needsTarget) {
1772 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1773 }
1774 }
1775
1776 @Override
1777 public void visitNewClass(JCNewClass tree) {
1778 boolean prevNeedsTarget = needsTarget;
1779 try {
1780 needsTarget = false;
1781 super.visitNewClass(tree);
1782 } finally {
1783 needsTarget = prevNeedsTarget;
1784 }
1785 }
1786
1787 @Override
1788 public void visitApply(JCMethodInvocation tree) {
1789 boolean prevNeedsTarget = needsTarget;
1790 try {
1791 needsTarget = false;
1792 super.visitApply(tree);
1793 } finally {
1794 needsTarget = prevNeedsTarget;
1795 }
1796 }
1797 }
1798
1799 public void visitSkip(JCSkip tree) {
1800 result = null;
1801 }
1802
1803 public void visitBlock(JCBlock tree) {
1804 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1805 // Block is a static or instance initializer;
1806 // let the owner of the environment be a freshly
1807 // created BLOCK-method.
1808 Symbol fakeOwner =
1809 new MethodSymbol(tree.flags | BLOCK |
1810 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1811 env.info.scope.owner);
1812 final Env<AttrContext> localEnv =
1813 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1814
1815 if ((tree.flags & STATIC) != 0) {
1816 localEnv.info.staticLevel++;
1817 } else {
1818 localEnv.info.instanceInitializerBlock = true;
1819 }
1820 // Attribute all type annotations in the block
1821 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1822 annotate.flush();
1823 attribStats(tree.stats, localEnv);
1824
1825 {
1826 // Store init and clinit type annotations with the ClassSymbol
1827 // to allow output in Gen.normalizeDefs.
1828 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1829 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1830 if ((tree.flags & STATIC) != 0) {
1831 cs.appendClassInitTypeAttributes(tas);
1832 } else {
1833 cs.appendInitTypeAttributes(tas);
1834 }
1835 }
1836 } else {
1837 // Create a new local environment with a local scope.
1838 Env<AttrContext> localEnv =
1839 env.dup(tree, env.info.dup(env.info.scope.dup()));
1840 try {
1841 attribStats(tree.stats, localEnv);
1842 } finally {
1843 localEnv.info.scope.leave();
1844 }
1845 }
1846 result = null;
1847 }
1848
1849 public void visitDoLoop(JCDoWhileLoop tree) {
1850 attribStat(tree.body, env.dup(tree));
1851 attribExpr(tree.cond, env, syms.booleanType);
1852 handleLoopConditionBindings(matchBindings, tree, tree.body);
1853 result = null;
1854 }
1855
1856 public void visitWhileLoop(JCWhileLoop tree) {
1857 attribExpr(tree.cond, env, syms.booleanType);
1858 MatchBindings condBindings = matchBindings;
1859 // include condition's bindings when true in the body:
1860 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1861 try {
1862 attribStat(tree.body, whileEnv.dup(tree));
1863 } finally {
1864 whileEnv.info.scope.leave();
1865 }
1866 handleLoopConditionBindings(condBindings, tree, tree.body);
1867 result = null;
1868 }
1869
1870 public void visitForLoop(JCForLoop tree) {
1871 Env<AttrContext> loopEnv =
1872 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1873 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1874 try {
1875 attribStats(tree.init, loopEnv);
1876 if (tree.cond != null) {
1877 attribExpr(tree.cond, loopEnv, syms.booleanType);
1878 // include condition's bindings when true in the body and step:
1879 condBindings = matchBindings;
1880 }
1881 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1882 try {
1883 bodyEnv.tree = tree; // before, we were not in loop!
1884 attribStats(tree.step, bodyEnv);
1885 attribStat(tree.body, bodyEnv);
1886 } finally {
1887 bodyEnv.info.scope.leave();
1888 }
1889 result = null;
1890 }
1891 finally {
1892 loopEnv.info.scope.leave();
1893 }
1894 handleLoopConditionBindings(condBindings, tree, tree.body);
1895 }
1896
1897 /**
1898 * Include condition's bindings when false after the loop, if cannot get out of the loop
1899 */
1900 private void handleLoopConditionBindings(MatchBindings condBindings,
1901 JCStatement loop,
1902 JCStatement loopBody) {
1903 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1904 !breaksTo(env, loop, loopBody)) {
1905 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1906 }
1907 }
1908
1909 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1910 preFlow(body);
1911 return flow.breaksToTree(env, loop, body, make);
1912 }
1913
1914 /**
1915 * Add given bindings to the current scope, unless there's a break to
1916 * an immediately enclosing labeled statement.
1917 */
1918 private void addBindings2Scope(JCStatement introducingStatement,
1919 List<BindingSymbol> bindings) {
1920 if (bindings.isEmpty()) {
1921 return ;
1922 }
1923
1924 var searchEnv = env;
1925 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1926 labeled.body == introducingStatement) {
1927 if (breaksTo(env, labeled, labeled.body)) {
1928 //breaking to an immediately enclosing labeled statement
1929 return ;
1930 }
1931 searchEnv = searchEnv.next;
1932 introducingStatement = labeled;
1933 }
1934
1935 //include condition's body when false after the while, if cannot get out of the loop
1936 bindings.forEach(env.info.scope::enter);
1937 bindings.forEach(BindingSymbol::preserveBinding);
1938 }
1939
1940 public void visitForeachLoop(JCEnhancedForLoop tree) {
1941 Env<AttrContext> loopEnv =
1942 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1943 try {
1944 //the Formal Parameter of a for-each loop is not in the scope when
1945 //attributing the for-each expression; we mimic this by attributing
1946 //the for-each expression first (against original scope).
1947 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1948 chk.checkNonVoid(tree.pos(), exprType);
1949 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1950 if (elemtype == null) {
1951 // or perhaps expr implements Iterable<T>?
1952 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1953 if (base == null) {
1954 log.error(tree.expr.pos(),
1955 Errors.ForeachNotApplicableToType(exprType,
1956 Fragments.TypeReqArrayOrIterable));
1957 elemtype = types.createErrorType(exprType);
1958 } else {
1959 List<Type> iterableParams = base.allparams();
1960 elemtype = iterableParams.isEmpty()
1961 ? syms.objectType
1962 : types.wildUpperBound(iterableParams.head);
1963
1964 // Check the return type of the method iterator().
1965 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1966 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1967 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1968 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1969 log.error(tree.pos(),
1970 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1971 }
1972 }
1973 }
1974 if (tree.var.isImplicitlyTyped()) {
1975 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1976 setSyntheticVariableType(tree.var, inferredType);
1977 }
1978 attribStat(tree.var, loopEnv);
1979 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1980 loopEnv.tree = tree; // before, we were not in loop!
1981 attribStat(tree.body, loopEnv);
1982 result = null;
1983 }
1984 finally {
1985 loopEnv.info.scope.leave();
1986 }
1987 }
1988
1989 public void visitLabelled(JCLabeledStatement tree) {
1990 // Check that label is not used in an enclosing statement
1991 Env<AttrContext> env1 = env;
1992 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1993 if (env1.tree.hasTag(LABELLED) &&
1994 ((JCLabeledStatement) env1.tree).label == tree.label) {
1995 log.error(tree.pos(),
1996 Errors.LabelAlreadyInUse(tree.label));
1997 break;
1998 }
1999 env1 = env1.next;
2000 }
2001
2002 attribStat(tree.body, env.dup(tree));
2003 result = null;
2004 }
2005
2006 public void visitSwitch(JCSwitch tree) {
2007 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
2008 attribStats(c.stats, caseEnv);
2009 });
2010 result = null;
2011 }
2012
2013 public void visitSwitchExpression(JCSwitchExpression tree) {
2014 boolean wrongContext = false;
2015
2016 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
2017 PolyKind.STANDALONE : PolyKind.POLY;
2018
2019 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2020 //this means we are returning a poly conditional from void-compatible lambda expression
2021 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
2022 resultInfo = recoveryInfo;
2023 wrongContext = true;
2024 }
2025
2026 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2027 unknownExprInfo :
2028 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
2029
2030 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
2031 ListBuffer<Type> caseTypes = new ListBuffer<>();
2032
2033 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
2034 caseEnv.info.yieldResult = condInfo;
2035 attribStats(c.stats, caseEnv);
2036 new TreeScanner() {
2037 @Override
2038 public void visitYield(JCYield brk) {
2039 if (brk.target == tree) {
2040 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
2041 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
2042 }
2043 super.visitYield(brk);
2044 }
2045
2046 @Override public void visitClassDef(JCClassDecl tree) {}
2047 @Override public void visitLambda(JCLambda tree) {}
2048 }.scan(c.stats);
2049 });
2050
2051 if (tree.cases.isEmpty()) {
2052 log.error(tree.pos(),
2053 Errors.SwitchExpressionEmpty);
2054 } else if (caseTypes.isEmpty()) {
2055 log.error(tree.pos(),
2056 Errors.SwitchExpressionNoResultExpressions);
2057 }
2058
2059 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
2060
2061 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
2062 }
2063 //where:
2064 CheckContext switchExpressionContext(CheckContext checkContext) {
2065 return new Check.NestedCheckContext(checkContext) {
2066 //this will use enclosing check context to check compatibility of
2067 //subexpression against target type; if we are in a method check context,
2068 //depending on whether boxing is allowed, we could have incompatibilities
2069 @Override
2070 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2071 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
2072 }
2073 };
2074 }
2075
2076 private void handleSwitch(JCTree switchTree,
2077 JCExpression selector,
2078 List<JCCase> cases,
2079 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
2080 Type seltype = attribExpr(selector, env);
2081 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
2082
2083 Env<AttrContext> switchEnv =
2084 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
2085
2086 try {
2087 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
2088 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
2089 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
2090 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
2091 boolean intSwitch = types.isAssignable(seltype, syms.intType);
2092 boolean patternSwitch;
2093 if (seltype.isPrimitive() && !intSwitch) {
2094 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
2095 patternSwitch = true;
2096 }
2097 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
2098 !intSwitch) {
2099 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
2100 patternSwitch = true;
2101 } else {
2102 patternSwitch = cases.stream()
2103 .flatMap(c -> c.labels.stream())
2104 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
2105 TreeInfo.isNullCaseLabel(l));
2106 }
2107
2108 // Attribute all cases and
2109 // check that there are no duplicate case labels or default clauses.
2110 Set<Object> constants = new HashSet<>(); // The set of case constants.
2111 boolean hasDefault = false; // Is there a default label?
2112 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
2113 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
2114 boolean hasNullPattern = false; // Is there a null pattern?
2115 CaseTree.CaseKind caseKind = null;
2116 boolean wasError = false;
2117 JCCaseLabel unconditionalCaseLabel = null;
2118 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
2119 JCCase c = l.head;
2120 if (caseKind == null) {
2121 caseKind = c.caseKind;
2122 } else if (caseKind != c.caseKind && !wasError) {
2123 log.error(c.pos(),
2124 Errors.SwitchMixingCaseTypes);
2125 wasError = true;
2126 }
2127 MatchBindings currentBindings = null;
2128 MatchBindings guardBindings = null;
2129 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
2130 JCCaseLabel label = labels.head;
2131 if (label instanceof JCConstantCaseLabel constLabel) {
2132 JCExpression expr = constLabel.expr;
2133 if (TreeInfo.isNull(expr)) {
2134 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
2135 if (hasNullPattern) {
2136 log.error(label.pos(), Errors.DuplicateCaseLabel);
2137 }
2138 hasNullPattern = true;
2139 attribExpr(expr, switchEnv, seltype);
2140 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
2141 } else if (enumSwitch) {
2142 Symbol sym = enumConstant(expr, seltype);
2143 if (sym == null) {
2144 if (allowPatternSwitch) {
2145 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2146 Symbol enumSym = TreeInfo.symbol(expr);
2147 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
2148 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
2149 } else if (!constants.add(enumSym)) {
2150 log.error(label.pos(), Errors.DuplicateCaseLabel);
2151 }
2152 } else {
2153 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
2154 }
2155 } else if (!constants.add(sym)) {
2156 log.error(label.pos(), Errors.DuplicateCaseLabel);
2157 }
2158 } else if (errorEnumSwitch) {
2159 //error recovery: the selector is erroneous, and all the case labels
2160 //are identifiers. This could be an enum switch - don't report resolve
2161 //error for the case label:
2162 var prevResolveHelper = rs.basicLogResolveHelper;
2163 try {
2164 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
2165 attribExpr(expr, switchEnv, seltype);
2166 } finally {
2167 rs.basicLogResolveHelper = prevResolveHelper;
2168 }
2169 } else {
2170 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
2171 if (!pattype.hasTag(ERROR)) {
2172 if (pattype.constValue() == null) {
2173 Symbol s = TreeInfo.symbol(expr);
2174 if (s != null && s.kind == TYP) {
2175 log.error(expr.pos(),
2176 Errors.PatternExpected);
2177 } else if (s == null || !s.isEnum()) {
2178 log.error(expr.pos(),
2179 (stringSwitch ? Errors.StringConstReq
2180 : intSwitch ? Errors.ConstExprReq
2181 : Errors.PatternOrEnumReq));
2182 } else if (!constants.add(s)) {
2183 log.error(label.pos(), Errors.DuplicateCaseLabel);
2184 }
2185 }
2186 else {
2187 boolean isLongFloatDoubleOrBooleanConstant =
2188 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
2189 if (isLongFloatDoubleOrBooleanConstant) {
2190 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
2191 }
2192 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
2193 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
2194 } else if (!constants.add(pattype.constValue())) {
2195 log.error(c.pos(), Errors.DuplicateCaseLabel);
2196 }
2197 }
2198 }
2199 }
2200 } else if (label instanceof JCDefaultCaseLabel def) {
2201 if (hasDefault) {
2202 log.error(label.pos(), Errors.DuplicateDefaultLabel);
2203 } else if (hasUnconditionalPattern) {
2204 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
2205 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2206 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
2207 }
2208 hasDefault = true;
2209 matchBindings = MatchBindingsComputer.EMPTY;
2210 } else if (label instanceof JCPatternCaseLabel patternlabel) {
2211 //pattern
2212 JCPattern pat = patternlabel.pat;
2213 attribExpr(pat, switchEnv, seltype);
2214 Type primaryType = TreeInfo.primaryPatternType(pat);
2215
2216 if (primaryType.isPrimitive()) {
2217 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
2218 } else if (!primaryType.hasTag(TYPEVAR)) {
2219 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
2220 }
2221 checkCastablePattern(pat.pos(), seltype, primaryType);
2222 Type patternType = types.erasure(primaryType);
2223 JCExpression guard = c.guard;
2224 if (guardBindings == null && guard != null) {
2225 MatchBindings afterPattern = matchBindings;
2226 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
2227 try {
2228 attribExpr(guard, bodyEnv, syms.booleanType);
2229 } finally {
2230 bodyEnv.info.scope.leave();
2231 }
2232
2233 guardBindings = matchBindings;
2234 matchBindings = afterPattern;
2235
2236 if (TreeInfo.isBooleanWithValue(guard, 0)) {
2237 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
2238 }
2239 }
2240 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
2241 boolean unconditional =
2242 unguarded &&
2243 !patternType.isErroneous() &&
2244 types.isUnconditionallyExact(seltype, patternType);
2245 if (unconditional) {
2246 if (hasUnconditionalPattern) {
2247 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
2248 } else if (hasDefault) {
2249 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
2250 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
2251 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
2252 }
2253 hasUnconditionalPattern = true;
2254 unconditionalCaseLabel = label;
2255 }
2256 lastPatternErroneous = patternType.isErroneous();
2257 } else {
2258 Assert.error();
2259 }
2260 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
2261 }
2262
2263 if (guardBindings != null) {
2264 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
2265 }
2266
2267 Env<AttrContext> caseEnv =
2268 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
2269 try {
2270 attribCase.accept(c, caseEnv);
2271 } finally {
2272 caseEnv.info.scope.leave();
2273 }
2274 addVars(c.stats, switchEnv.info.scope);
2275
2276 preFlow(c);
2277 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
2278 }
2279 if (patternSwitch) {
2280 chk.checkSwitchCaseStructure(cases);
2281 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
2282 }
2283 if (switchTree.hasTag(SWITCH)) {
2284 ((JCSwitch) switchTree).hasUnconditionalPattern =
2285 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2286 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
2287 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
2288 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
2289 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
2290 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
2291 } else {
2292 Assert.error(switchTree.getTag().name());
2293 }
2294 } finally {
2295 switchEnv.info.scope.leave();
2296 }
2297 }
2298 // where
2299 private ResultInfo caseLabelResultInfo(Type seltype) {
2300 return new ResultInfo(KindSelector.VAL_TYP,
2301 !seltype.hasTag(ERROR) ? seltype
2302 : Type.noType);
2303 }
2304 /** Add any variables defined in stats to the switch scope. */
2305 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
2306 for (;stats.nonEmpty(); stats = stats.tail) {
2307 JCTree stat = stats.head;
2308 if (stat.hasTag(VARDEF))
2309 switchScope.enter(((JCVariableDecl) stat).sym);
2310 }
2311 }
2312 // where
2313 /** Return the selected enumeration constant symbol, or null. */
2314 private Symbol enumConstant(JCTree tree, Type enumType) {
2315 if (tree.hasTag(IDENT)) {
2316 JCIdent ident = (JCIdent)tree;
2317 Name name = ident.name;
2318 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
2319 if (sym.kind == VAR) {
2320 Symbol s = ident.sym = sym;
2321 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
2322 ident.type = s.type;
2323 return ((s.flags_field & Flags.ENUM) == 0)
2324 ? null : s;
2325 }
2326 }
2327 }
2328 return null;
2329 }
2330
2331 public void visitSynchronized(JCSynchronized tree) {
2332 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
2333 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
2334 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
2335 }
2336 attribStat(tree.body, env);
2337 result = null;
2338 }
2339
2340 public void visitTry(JCTry tree) {
2341 // Create a new local environment with a local
2342 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
2343 try {
2344 boolean isTryWithResource = tree.resources.nonEmpty();
2345 // Create a nested environment for attributing the try block if needed
2346 Env<AttrContext> tryEnv = isTryWithResource ?
2347 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2348 localEnv;
2349 try {
2350 // Attribute resource declarations
2351 for (JCTree resource : tree.resources) {
2352 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
2353 @Override
2354 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2355 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
2356 }
2357 };
2358 ResultInfo twrResult =
2359 new ResultInfo(KindSelector.VAR,
2360 syms.autoCloseableType,
2361 twrContext);
2362 if (resource.hasTag(VARDEF)) {
2363 attribStat(resource, tryEnv);
2364 twrResult.check(resource, resource.type);
2365
2366 //check that resource type cannot throw InterruptedException
2367 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2368
2369 VarSymbol var = ((JCVariableDecl) resource).sym;
2370
2371 var.flags_field |= Flags.FINAL;
2372 var.setData(ElementKind.RESOURCE_VARIABLE);
2373 } else {
2374 attribTree(resource, tryEnv, twrResult);
2375 }
2376 }
2377 // Attribute body
2378 attribStat(tree.body, tryEnv);
2379 } finally {
2380 if (isTryWithResource)
2381 tryEnv.info.scope.leave();
2382 }
2383
2384 // Attribute catch clauses
2385 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2386 JCCatch c = l.head;
2387 Env<AttrContext> catchEnv =
2388 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2389 try {
2390 Type ctype = attribStat(c.param, catchEnv);
2391 if (TreeInfo.isMultiCatch(c)) {
2392 //multi-catch parameter is implicitly marked as final
2393 c.param.sym.flags_field |= FINAL | UNION;
2394 }
2395 if (c.param.sym.kind == VAR) {
2396 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2397 }
2398 chk.checkType(c.param.vartype.pos(),
2399 chk.checkClassType(c.param.vartype.pos(), ctype),
2400 syms.throwableType);
2401 attribStat(c.body, catchEnv);
2402 } finally {
2403 catchEnv.info.scope.leave();
2404 }
2405 }
2406
2407 // Attribute finalizer
2408 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2409 result = null;
2410 }
2411 finally {
2412 localEnv.info.scope.leave();
2413 }
2414 }
2415
2416 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2417 if (!resource.isErroneous() &&
2418 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2419 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2420 Symbol close = syms.noSymbol;
2421 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2422 try {
2423 close = rs.resolveQualifiedMethod(pos,
2424 env,
2425 types.skipTypeVars(resource, false),
2426 names.close,
2427 List.nil(),
2428 List.nil());
2429 }
2430 finally {
2431 log.popDiagnosticHandler(discardHandler);
2432 }
2433 if (close.kind == MTH &&
2434 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2435 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2436 log.warning(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2437 }
2438 }
2439 }
2440
2441 public void visitConditional(JCConditional tree) {
2442 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2443 MatchBindings condBindings = matchBindings;
2444
2445 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2446 isBooleanOrNumeric(env, tree)) ?
2447 PolyKind.STANDALONE : PolyKind.POLY;
2448
2449 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2450 //this means we are returning a poly conditional from void-compatible lambda expression
2451 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2452 result = tree.type = types.createErrorType(resultInfo.pt);
2453 return;
2454 }
2455
2456 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2457 unknownExprInfo :
2458 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2459
2460
2461 // x ? y : z
2462 // include x's bindings when true in y
2463 // include x's bindings when false in z
2464
2465 Type truetype;
2466 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2467 try {
2468 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2469 } finally {
2470 trueEnv.info.scope.leave();
2471 }
2472
2473 MatchBindings trueBindings = matchBindings;
2474
2475 Type falsetype;
2476 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2477 try {
2478 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2479 } finally {
2480 falseEnv.info.scope.leave();
2481 }
2482
2483 MatchBindings falseBindings = matchBindings;
2484
2485 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2486 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2487 List.of(truetype, falsetype)) : pt();
2488 if (condtype.constValue() != null &&
2489 truetype.constValue() != null &&
2490 falsetype.constValue() != null &&
2491 !owntype.hasTag(NONE)) {
2492 //constant folding
2493 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2494 }
2495 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2496 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2497 }
2498 //where
2499 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2500 switch (tree.getTag()) {
2501 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2502 ((JCLiteral)tree).typetag == BOOLEAN ||
2503 ((JCLiteral)tree).typetag == BOT;
2504 case LAMBDA: case REFERENCE: return false;
2505 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2506 case CONDEXPR:
2507 JCConditional condTree = (JCConditional)tree;
2508 return isBooleanOrNumeric(env, condTree.truepart) &&
2509 isBooleanOrNumeric(env, condTree.falsepart);
2510 case APPLY:
2511 JCMethodInvocation speculativeMethodTree =
2512 (JCMethodInvocation)deferredAttr.attribSpeculative(
2513 tree, env, unknownExprInfo,
2514 argumentAttr.withLocalCacheContext());
2515 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2516 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2517 env.enclClass.type :
2518 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2519 Type owntype = types.memberType(receiverType, msym).getReturnType();
2520 return primitiveOrBoxed(owntype);
2521 case NEWCLASS:
2522 JCExpression className =
2523 removeClassParams.translate(((JCNewClass)tree).clazz);
2524 JCExpression speculativeNewClassTree =
2525 (JCExpression)deferredAttr.attribSpeculative(
2526 className, env, unknownTypeInfo,
2527 argumentAttr.withLocalCacheContext());
2528 return primitiveOrBoxed(speculativeNewClassTree.type);
2529 default:
2530 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2531 argumentAttr.withLocalCacheContext()).type;
2532 return primitiveOrBoxed(speculativeType);
2533 }
2534 }
2535 //where
2536 boolean primitiveOrBoxed(Type t) {
2537 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2538 }
2539
2540 TreeTranslator removeClassParams = new TreeTranslator() {
2541 @Override
2542 public void visitTypeApply(JCTypeApply tree) {
2543 result = translate(tree.clazz);
2544 }
2545 };
2546
2547 CheckContext conditionalContext(CheckContext checkContext) {
2548 return new Check.NestedCheckContext(checkContext) {
2549 //this will use enclosing check context to check compatibility of
2550 //subexpression against target type; if we are in a method check context,
2551 //depending on whether boxing is allowed, we could have incompatibilities
2552 @Override
2553 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2554 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2555 }
2556 };
2557 }
2558
2559 /** Compute the type of a conditional expression, after
2560 * checking that it exists. See JLS 15.25. Does not take into
2561 * account the special case where condition and both arms
2562 * are constants.
2563 *
2564 * @param pos The source position to be used for error
2565 * diagnostics.
2566 * @param thentype The type of the expression's then-part.
2567 * @param elsetype The type of the expression's else-part.
2568 */
2569 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2570 if (condTypes.isEmpty()) {
2571 return syms.objectType; //TODO: how to handle?
2572 }
2573 Type first = condTypes.head;
2574 // If same type, that is the result
2575 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2576 return first.baseType();
2577
2578 List<Type> unboxedTypes = condTypes.stream()
2579 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2580 .collect(List.collector());
2581
2582 // Otherwise, if both arms can be converted to a numeric
2583 // type, return the least numeric type that fits both arms
2584 // (i.e. return larger of the two, or return int if one
2585 // arm is short, the other is char).
2586 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2587 // If one arm has an integer subrange type (i.e., byte,
2588 // short, or char), and the other is an integer constant
2589 // that fits into the subrange, return the subrange type.
2590 for (Type type : unboxedTypes) {
2591 if (!type.getTag().isStrictSubRangeOf(INT)) {
2592 continue;
2593 }
2594 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2595 return type.baseType();
2596 }
2597
2598 for (TypeTag tag : primitiveTags) {
2599 Type candidate = syms.typeOfTag[tag.ordinal()];
2600 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2601 return candidate;
2602 }
2603 }
2604 }
2605
2606 // Those were all the cases that could result in a primitive
2607 condTypes = condTypes.stream()
2608 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2609 .collect(List.collector());
2610
2611 for (Type type : condTypes) {
2612 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2613 return type.baseType();
2614 }
2615
2616 Iterator<DiagnosticPosition> posIt = positions.iterator();
2617
2618 condTypes = condTypes.stream()
2619 .map(t -> chk.checkNonVoid(posIt.next(), t))
2620 .collect(List.collector());
2621
2622 // both are known to be reference types. The result is
2623 // lub(thentype,elsetype). This cannot fail, as it will
2624 // always be possible to infer "Object" if nothing better.
2625 return types.lub(condTypes.stream()
2626 .map(t -> t.baseType())
2627 .filter(t -> !t.hasTag(BOT))
2628 .collect(List.collector()));
2629 }
2630
2631 static final TypeTag[] primitiveTags = new TypeTag[]{
2632 BYTE,
2633 CHAR,
2634 SHORT,
2635 INT,
2636 LONG,
2637 FLOAT,
2638 DOUBLE,
2639 BOOLEAN,
2640 };
2641
2642 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2643 return bindingEnv(env, env.tree, bindings);
2644 }
2645
2646 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2647 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2648 bindings.forEach(env1.info.scope::enter);
2649 return env1;
2650 }
2651
2652 public void visitIf(JCIf tree) {
2653 attribExpr(tree.cond, env, syms.booleanType);
2654
2655 // if (x) { y } [ else z ]
2656 // include x's bindings when true in y
2657 // include x's bindings when false in z
2658
2659 MatchBindings condBindings = matchBindings;
2660 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2661
2662 try {
2663 attribStat(tree.thenpart, thenEnv);
2664 } finally {
2665 thenEnv.info.scope.leave();
2666 }
2667
2668 preFlow(tree.thenpart);
2669 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2670 boolean aliveAfterElse;
2671
2672 if (tree.elsepart != null) {
2673 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2674 try {
2675 attribStat(tree.elsepart, elseEnv);
2676 } finally {
2677 elseEnv.info.scope.leave();
2678 }
2679 preFlow(tree.elsepart);
2680 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2681 } else {
2682 aliveAfterElse = true;
2683 }
2684
2685 chk.checkEmptyIf(tree);
2686
2687 List<BindingSymbol> afterIfBindings = List.nil();
2688
2689 if (aliveAfterThen && !aliveAfterElse) {
2690 afterIfBindings = condBindings.bindingsWhenTrue;
2691 } else if (aliveAfterElse && !aliveAfterThen) {
2692 afterIfBindings = condBindings.bindingsWhenFalse;
2693 }
2694
2695 addBindings2Scope(tree, afterIfBindings);
2696
2697 result = null;
2698 }
2699
2700 void preFlow(JCTree tree) {
2701 attrRecover.doRecovery();
2702 new PostAttrAnalyzer() {
2703 @Override
2704 public void scan(JCTree tree) {
2705 if (tree == null ||
2706 (tree.type != null &&
2707 tree.type == Type.stuckType)) {
2708 //don't touch stuck expressions!
2709 return;
2710 }
2711 super.scan(tree);
2712 }
2713
2714 @Override
2715 public void visitClassDef(JCClassDecl that) {
2716 if (that.sym != null) {
2717 // Method preFlow shouldn't visit class definitions
2718 // that have not been entered and attributed.
2719 // See JDK-8254557 and JDK-8203277 for more details.
2720 super.visitClassDef(that);
2721 }
2722 }
2723
2724 @Override
2725 public void visitLambda(JCLambda that) {
2726 if (that.type != null) {
2727 // Method preFlow shouldn't visit lambda expressions
2728 // that have not been entered and attributed.
2729 // See JDK-8254557 and JDK-8203277 for more details.
2730 super.visitLambda(that);
2731 }
2732 }
2733 }.scan(tree);
2734 }
2735
2736 public void visitExec(JCExpressionStatement tree) {
2737 //a fresh environment is required for 292 inference to work properly ---
2738 //see Infer.instantiatePolymorphicSignatureInstance()
2739 Env<AttrContext> localEnv = env.dup(tree);
2740 attribExpr(tree.expr, localEnv);
2741 result = null;
2742 }
2743
2744 public void visitBreak(JCBreak tree) {
2745 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2746 result = null;
2747 }
2748
2749 public void visitYield(JCYield tree) {
2750 if (env.info.yieldResult != null) {
2751 attribTree(tree.value, env, env.info.yieldResult);
2752 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2753 } else {
2754 log.error(tree.pos(), tree.value.hasTag(PARENS)
2755 ? Errors.NoSwitchExpressionQualify
2756 : Errors.NoSwitchExpression);
2757 attribTree(tree.value, env, unknownExprInfo);
2758 }
2759 result = null;
2760 }
2761
2762 public void visitContinue(JCContinue tree) {
2763 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2764 result = null;
2765 }
2766 //where
2767 /** Return the target of a break, continue or yield statement,
2768 * if it exists, report an error if not.
2769 * Note: The target of a labelled break or continue is the
2770 * (non-labelled) statement tree referred to by the label,
2771 * not the tree representing the labelled statement itself.
2772 *
2773 * @param pos The position to be used for error diagnostics
2774 * @param tag The tag of the jump statement. This is either
2775 * Tree.BREAK or Tree.CONTINUE.
2776 * @param label The label of the jump statement, or null if no
2777 * label is given.
2778 * @param env The environment current at the jump statement.
2779 */
2780 private JCTree findJumpTarget(DiagnosticPosition pos,
2781 JCTree.Tag tag,
2782 Name label,
2783 Env<AttrContext> env) {
2784 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2785
2786 if (jumpTarget.snd != null) {
2787 log.error(pos, jumpTarget.snd);
2788 }
2789
2790 return jumpTarget.fst;
2791 }
2792 /** Return the target of a break or continue statement, if it exists,
2793 * report an error if not.
2794 * Note: The target of a labelled break or continue is the
2795 * (non-labelled) statement tree referred to by the label,
2796 * not the tree representing the labelled statement itself.
2797 *
2798 * @param tag The tag of the jump statement. This is either
2799 * Tree.BREAK or Tree.CONTINUE.
2800 * @param label The label of the jump statement, or null if no
2801 * label is given.
2802 * @param env The environment current at the jump statement.
2803 */
2804 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2805 Name label,
2806 Env<AttrContext> env) {
2807 // Search environments outwards from the point of jump.
2808 Env<AttrContext> env1 = env;
2809 JCDiagnostic.Error pendingError = null;
2810 LOOP:
2811 while (env1 != null) {
2812 switch (env1.tree.getTag()) {
2813 case LABELLED:
2814 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2815 if (label == labelled.label) {
2816 // If jump is a continue, check that target is a loop.
2817 if (tag == CONTINUE) {
2818 if (!labelled.body.hasTag(DOLOOP) &&
2819 !labelled.body.hasTag(WHILELOOP) &&
2820 !labelled.body.hasTag(FORLOOP) &&
2821 !labelled.body.hasTag(FOREACHLOOP)) {
2822 pendingError = Errors.NotLoopLabel(label);
2823 }
2824 // Found labelled statement target, now go inwards
2825 // to next non-labelled tree.
2826 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2827 } else {
2828 return Pair.of(labelled, pendingError);
2829 }
2830 }
2831 break;
2832 case DOLOOP:
2833 case WHILELOOP:
2834 case FORLOOP:
2835 case FOREACHLOOP:
2836 if (label == null) return Pair.of(env1.tree, pendingError);
2837 break;
2838 case SWITCH:
2839 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2840 break;
2841 case SWITCH_EXPRESSION:
2842 if (tag == YIELD) {
2843 return Pair.of(env1.tree, null);
2844 } else if (tag == BREAK) {
2845 pendingError = Errors.BreakOutsideSwitchExpression;
2846 } else {
2847 pendingError = Errors.ContinueOutsideSwitchExpression;
2848 }
2849 break;
2850 case LAMBDA:
2851 case METHODDEF:
2852 case CLASSDEF:
2853 break LOOP;
2854 default:
2855 }
2856 env1 = env1.next;
2857 }
2858 if (label != null)
2859 return Pair.of(null, Errors.UndefLabel(label));
2860 else if (pendingError != null)
2861 return Pair.of(null, pendingError);
2862 else if (tag == CONTINUE)
2863 return Pair.of(null, Errors.ContOutsideLoop);
2864 else
2865 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2866 }
2867
2868 public void visitReturn(JCReturn tree) {
2869 // Check that there is an enclosing method which is
2870 // nested within than the enclosing class.
2871 if (env.info.returnResult == null) {
2872 log.error(tree.pos(), Errors.RetOutsideMeth);
2873 } else if (env.info.yieldResult != null) {
2874 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2875 if (tree.expr != null) {
2876 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2877 }
2878 } else if (!env.info.isLambda &&
2879 env.enclMethod != null &&
2880 TreeInfo.isCompactConstructor(env.enclMethod)) {
2881 log.error(env.enclMethod,
2882 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2883 } else {
2884 // Attribute return expression, if it exists, and check that
2885 // it conforms to result type of enclosing method.
2886 if (tree.expr != null) {
2887 if (env.info.returnResult.pt.hasTag(VOID)) {
2888 env.info.returnResult.checkContext.report(tree.expr.pos(),
2889 diags.fragment(Fragments.UnexpectedRetVal));
2890 }
2891 attribTree(tree.expr, env, env.info.returnResult);
2892 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2893 !env.info.returnResult.pt.hasTag(NONE)) {
2894 env.info.returnResult.checkContext.report(tree.pos(),
2895 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2896 }
2897 }
2898 result = null;
2899 }
2900
2901 public void visitThrow(JCThrow tree) {
2902 Type owntype = attribExpr(tree.expr, env, Type.noType);
2903 chk.checkType(tree, owntype, syms.throwableType);
2904 result = null;
2905 }
2906
2907 public void visitAssert(JCAssert tree) {
2908 attribExpr(tree.cond, env, syms.booleanType);
2909 if (tree.detail != null) {
2910 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2911 }
2912 result = null;
2913 }
2914
2915 /** Visitor method for method invocations.
2916 * NOTE: The method part of an application will have in its type field
2917 * the return type of the method, not the method's type itself!
2918 */
2919 public void visitApply(JCMethodInvocation tree) {
2920 // The local environment of a method application is
2921 // a new environment nested in the current one.
2922 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2923
2924 // The types of the actual method arguments.
2925 List<Type> argtypes;
2926
2927 // The types of the actual method type arguments.
2928 List<Type> typeargtypes = null;
2929
2930 Name methName = TreeInfo.name(tree.meth);
2931
2932 boolean isConstructorCall =
2933 methName == names._this || methName == names._super;
2934
2935 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2936 if (isConstructorCall) {
2937
2938 // Attribute arguments, yielding list of argument types.
2939 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2940 argtypes = argtypesBuf.toList();
2941 typeargtypes = attribTypes(tree.typeargs, localEnv);
2942
2943 // Done with this()/super() parameters. End of constructor prologue.
2944 env.info.ctorPrologue = false;
2945
2946 // Variable `site' points to the class in which the called
2947 // constructor is defined.
2948 Type site = env.enclClass.sym.type;
2949 if (methName == names._super) {
2950 if (site == syms.objectType) {
2951 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2952 site = types.createErrorType(syms.objectType);
2953 } else {
2954 site = types.supertype(site);
2955 }
2956 }
2957
2958 if (site.hasTag(CLASS)) {
2959 Type encl = site.getEnclosingType();
2960 while (encl != null && encl.hasTag(TYPEVAR))
2961 encl = encl.getUpperBound();
2962 if (encl.hasTag(CLASS)) {
2963 // we are calling a nested class
2964
2965 if (tree.meth.hasTag(SELECT)) {
2966 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2967
2968 // We are seeing a prefixed call, of the form
2969 // <expr>.super(...).
2970 // Check that the prefix expression conforms
2971 // to the outer instance type of the class.
2972 chk.checkRefType(qualifier.pos(),
2973 attribExpr(qualifier, localEnv,
2974 encl));
2975 }
2976 } else if (tree.meth.hasTag(SELECT)) {
2977 log.error(tree.meth.pos(),
2978 Errors.IllegalQualNotIcls(site.tsym));
2979 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2980 }
2981
2982 if (tree.meth.hasTag(IDENT)) {
2983 // non-qualified super(...) call; check whether explicit constructor
2984 // invocation is well-formed. If the super class is an inner class,
2985 // make sure that an appropriate implicit qualifier exists. If the super
2986 // class is a local class, make sure that the current class is defined
2987 // in the same context as the local class.
2988 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2989 }
2990
2991 // if we're calling a java.lang.Enum constructor,
2992 // prefix the implicit String and int parameters
2993 if (site.tsym == syms.enumSym)
2994 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2995
2996 // Resolve the called constructor under the assumption
2997 // that we are referring to a superclass instance of the
2998 // current instance (JLS ???).
2999 boolean selectSuperPrev = localEnv.info.selectSuper;
3000 localEnv.info.selectSuper = true;
3001 localEnv.info.pendingResolutionPhase = null;
3002 Symbol sym = rs.resolveConstructor(
3003 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
3004 localEnv.info.selectSuper = selectSuperPrev;
3005
3006 // Set method symbol to resolved constructor...
3007 TreeInfo.setSymbol(tree.meth, sym);
3008
3009 // ...and check that it is legal in the current context.
3010 // (this will also set the tree's type)
3011 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
3012 checkId(tree.meth, site, sym, localEnv,
3013 new ResultInfo(kind, mpt));
3014 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
3015 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
3016 }
3017 // Otherwise, `site' is an error type and we do nothing
3018 result = tree.type = syms.voidType;
3019 } else {
3020 // Otherwise, we are seeing a regular method call.
3021 // Attribute the arguments, yielding list of argument types, ...
3022 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
3023 argtypes = argtypesBuf.toList();
3024 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
3025
3026 // ... and attribute the method using as a prototype a methodtype
3027 // whose formal argument types is exactly the list of actual
3028 // arguments (this will also set the method symbol).
3029 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
3030 localEnv.info.pendingResolutionPhase = null;
3031 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
3032
3033 // Compute the result type.
3034 Type restype = mtype.getReturnType();
3035 if (restype.hasTag(WILDCARD))
3036 throw new AssertionError(mtype);
3037
3038 Type qualifier = (tree.meth.hasTag(SELECT))
3039 ? ((JCFieldAccess) tree.meth).selected.type
3040 : env.enclClass.sym.type;
3041 Symbol msym = TreeInfo.symbol(tree.meth);
3042 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
3043
3044 chk.checkRefTypes(tree.typeargs, typeargtypes);
3045
3046 // Check that value of resulting type is admissible in the
3047 // current context. Also, capture the return type
3048 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
3049 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
3050 }
3051 chk.checkRequiresIdentity(tree, env.info.lint);
3052 chk.validate(tree.typeargs, localEnv);
3053 }
3054 //where
3055 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
3056 if (msym != null &&
3057 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
3058 methodName == names.getClass &&
3059 argtypes.isEmpty()) {
3060 // as a special case, x.getClass() has type Class<? extends |X|>
3061 return new ClassType(restype.getEnclosingType(),
3062 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
3063 BoundKind.EXTENDS,
3064 syms.boundClass)),
3065 restype.tsym,
3066 restype.getMetadata());
3067 } else if (msym != null &&
3068 msym.owner == syms.arrayClass &&
3069 methodName == names.clone &&
3070 types.isArray(qualifierType)) {
3071 // as a special case, array.clone() has a result that is
3072 // the same as static type of the array being cloned
3073 return qualifierType;
3074 } else {
3075 return restype;
3076 }
3077 }
3078
3079 /** Obtain a method type with given argument types.
3080 */
3081 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
3082 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
3083 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
3084 }
3085
3086 public void visitNewClass(final JCNewClass tree) {
3087 Type owntype = types.createErrorType(tree.type);
3088
3089 // The local environment of a class creation is
3090 // a new environment nested in the current one.
3091 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
3092
3093 // The anonymous inner class definition of the new expression,
3094 // if one is defined by it.
3095 JCClassDecl cdef = tree.def;
3096
3097 // If enclosing class is given, attribute it, and
3098 // complete class name to be fully qualified
3099 JCExpression clazz = tree.clazz; // Class field following new
3100 JCExpression clazzid; // Identifier in class field
3101 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
3102 annoclazzid = null;
3103
3104 if (clazz.hasTag(TYPEAPPLY)) {
3105 clazzid = ((JCTypeApply) clazz).clazz;
3106 if (clazzid.hasTag(ANNOTATED_TYPE)) {
3107 annoclazzid = (JCAnnotatedType) clazzid;
3108 clazzid = annoclazzid.underlyingType;
3109 }
3110 } else {
3111 if (clazz.hasTag(ANNOTATED_TYPE)) {
3112 annoclazzid = (JCAnnotatedType) clazz;
3113 clazzid = annoclazzid.underlyingType;
3114 } else {
3115 clazzid = clazz;
3116 }
3117 }
3118
3119 JCExpression clazzid1 = clazzid; // The same in fully qualified form
3120
3121 if (tree.encl != null) {
3122 // We are seeing a qualified new, of the form
3123 // <expr>.new C <...> (...) ...
3124 // In this case, we let clazz stand for the name of the
3125 // allocated class C prefixed with the type of the qualifier
3126 // expression, so that we can
3127 // resolve it with standard techniques later. I.e., if
3128 // <expr> has type T, then <expr>.new C <...> (...)
3129 // yields a clazz T.C.
3130 Type encltype = chk.checkRefType(tree.encl.pos(),
3131 attribExpr(tree.encl, env));
3132 // TODO 308: in <expr>.new C, do we also want to add the type annotations
3133 // from expr to the combined type, or not? Yes, do this.
3134 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
3135 ((JCIdent) clazzid).name);
3136
3137 EndPosTable endPosTable = this.env.toplevel.endPositions;
3138 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
3139 if (clazz.hasTag(ANNOTATED_TYPE)) {
3140 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
3141 List<JCAnnotation> annos = annoType.annotations;
3142
3143 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
3144 clazzid1 = make.at(tree.pos).
3145 TypeApply(clazzid1,
3146 ((JCTypeApply) clazz).arguments);
3147 }
3148
3149 clazzid1 = make.at(tree.pos).
3150 AnnotatedType(annos, clazzid1);
3151 } else if (clazz.hasTag(TYPEAPPLY)) {
3152 clazzid1 = make.at(tree.pos).
3153 TypeApply(clazzid1,
3154 ((JCTypeApply) clazz).arguments);
3155 }
3156
3157 clazz = clazzid1;
3158 }
3159
3160 // Attribute clazz expression and store
3161 // symbol + type back into the attributed tree.
3162 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
3163 attribIdentAsEnumType(env, (JCIdent)clazz) :
3164 attribType(clazz, env);
3165
3166 clazztype = chk.checkDiamond(tree, clazztype);
3167 chk.validate(clazz, localEnv);
3168 if (tree.encl != null) {
3169 // We have to work in this case to store
3170 // symbol + type back into the attributed tree.
3171 tree.clazz.type = clazztype;
3172 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
3173 clazzid.type = ((JCIdent) clazzid).sym.type;
3174 if (annoclazzid != null) {
3175 annoclazzid.type = clazzid.type;
3176 }
3177 if (!clazztype.isErroneous()) {
3178 if (cdef != null && clazztype.tsym.isInterface()) {
3179 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
3180 } else if (clazztype.tsym.isStatic()) {
3181 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
3182 }
3183 }
3184 } else {
3185 // Check for the existence of an apropos outer instance
3186 checkNewInnerClass(tree.pos(), env, clazztype, false);
3187 }
3188
3189 // Attribute constructor arguments.
3190 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
3191 final KindSelector pkind =
3192 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
3193 List<Type> argtypes = argtypesBuf.toList();
3194 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
3195
3196 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
3197 // Enums may not be instantiated except implicitly
3198 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
3199 (!env.tree.hasTag(VARDEF) ||
3200 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
3201 ((JCVariableDecl) env.tree).init != tree))
3202 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
3203
3204 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
3205 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3206 boolean skipNonDiamondPath = false;
3207 // Check that class is not abstract
3208 if (cdef == null && !tree.classDeclRemoved() && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
3209 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
3210 log.error(tree.pos(),
3211 Errors.AbstractCantBeInstantiated(clazztype.tsym));
3212 skipNonDiamondPath = true;
3213 } else if (cdef != null && clazztype.tsym.isInterface()) {
3214 // Check that no constructor arguments are given to
3215 // anonymous classes implementing an interface
3216 if (!argtypes.isEmpty())
3217 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
3218
3219 if (!typeargtypes.isEmpty())
3220 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
3221
3222 // Error recovery: pretend no arguments were supplied.
3223 argtypes = List.nil();
3224 typeargtypes = List.nil();
3225 skipNonDiamondPath = true;
3226 }
3227 if (TreeInfo.isDiamond(tree)) {
3228 ClassType site = new ClassType(clazztype.getEnclosingType(),
3229 clazztype.tsym.type.getTypeArguments(),
3230 clazztype.tsym,
3231 clazztype.getMetadata());
3232
3233 Env<AttrContext> diamondEnv = localEnv.dup(tree);
3234 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
3235 diamondEnv.info.pendingResolutionPhase = null;
3236
3237 //if the type of the instance creation expression is a class type
3238 //apply method resolution inference (JLS 15.12.2.7). The return type
3239 //of the resolved constructor will be a partially instantiated type
3240 Symbol constructor = rs.resolveDiamond(tree.pos(),
3241 diamondEnv,
3242 site,
3243 argtypes,
3244 typeargtypes);
3245 tree.constructor = constructor.baseSymbol();
3246
3247 final TypeSymbol csym = clazztype.tsym;
3248 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
3249 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3250 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
3251 constructorType = checkId(tree, site,
3252 constructor,
3253 diamondEnv,
3254 diamondResult);
3255
3256 tree.clazz.type = types.createErrorType(clazztype);
3257 if (!constructorType.isErroneous()) {
3258 tree.clazz.type = clazz.type = constructorType.getReturnType();
3259 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
3260 }
3261 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
3262 }
3263
3264 // Resolve the called constructor under the assumption
3265 // that we are referring to a superclass instance of the
3266 // current instance (JLS ???).
3267 else if (!skipNonDiamondPath) {
3268 //the following code alters some of the fields in the current
3269 //AttrContext - hence, the current context must be dup'ed in
3270 //order to avoid downstream failures
3271 Env<AttrContext> rsEnv = localEnv.dup(tree);
3272 rsEnv.info.selectSuper = cdef != null;
3273 rsEnv.info.pendingResolutionPhase = null;
3274 tree.constructor = rs.resolveConstructor(
3275 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
3276 if (cdef == null) { //do not check twice!
3277 tree.constructorType = checkId(tree,
3278 clazztype,
3279 tree.constructor,
3280 rsEnv,
3281 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3282 if (rsEnv.info.lastResolveVarargs())
3283 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
3284 }
3285 }
3286
3287 chk.checkRequiresIdentity(tree, env.info.lint);
3288
3289 if (cdef != null) {
3290 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
3291 return;
3292 }
3293
3294 if (tree.constructor != null && tree.constructor.kind == MTH)
3295 owntype = clazztype;
3296 }
3297 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3298 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3299 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
3300 //we need to wait for inference to finish and then replace inference vars in the constructor type
3301 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
3302 instantiatedContext -> {
3303 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3304 });
3305 }
3306 chk.validate(tree.typeargs, localEnv);
3307 }
3308
3309 // where
3310 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
3311 JCClassDecl cdef, Env<AttrContext> localEnv,
3312 List<Type> argtypes, List<Type> typeargtypes,
3313 KindSelector pkind) {
3314 // We are seeing an anonymous class instance creation.
3315 // In this case, the class instance creation
3316 // expression
3317 //
3318 // E.new <typeargs1>C<typargs2>(args) { ... }
3319 //
3320 // is represented internally as
3321 //
3322 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
3323 //
3324 // This expression is then *transformed* as follows:
3325 //
3326 // (1) add an extends or implements clause
3327 // (2) add a constructor.
3328 //
3329 // For instance, if C is a class, and ET is the type of E,
3330 // the expression
3331 //
3332 // E.new <typeargs1>C<typargs2>(args) { ... }
3333 //
3334 // is translated to (where X is a fresh name and typarams is the
3335 // parameter list of the super constructor):
3336 //
3337 // new <typeargs1>X(<*nullchk*>E, args) where
3338 // X extends C<typargs2> {
3339 // <typarams> X(ET e, args) {
3340 // e.<typeargs1>super(args)
3341 // }
3342 // ...
3343 // }
3344 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3345 Type enclType = clazztype.getEnclosingType();
3346 if (enclType != null &&
3347 enclType.hasTag(CLASS) &&
3348 !chk.checkDenotable((ClassType)enclType)) {
3349 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
3350 }
3351 final boolean isDiamond = TreeInfo.isDiamond(tree);
3352 if (isDiamond
3353 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3354 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3355 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3356 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3357 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3358 instantiatedContext -> {
3359 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3360 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3361 ResultInfo prevResult = this.resultInfo;
3362 try {
3363 this.resultInfo = resultInfoForClassDefinition;
3364 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3365 dupLocalEnv, argtypes, typeargtypes, pkind);
3366 } finally {
3367 this.resultInfo = prevResult;
3368 }
3369 });
3370 } else {
3371 if (isDiamond && clazztype.hasTag(CLASS)) {
3372 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3373 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3374 // One or more types inferred in the previous steps is non-denotable.
3375 Fragment fragment = Diamond(clazztype.tsym);
3376 log.error(tree.clazz.pos(),
3377 Errors.CantApplyDiamond1(
3378 fragment,
3379 invalidDiamondArgs.size() > 1 ?
3380 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3381 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3382 }
3383 // For <>(){}, inferred types must also be accessible.
3384 for (Type t : clazztype.getTypeArguments()) {
3385 rs.checkAccessibleType(env, t);
3386 }
3387 }
3388
3389 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3390 // false for isInterface call even when the original type is an interface.
3391 boolean implementing = clazztype.tsym.isInterface() ||
3392 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3393 clazztype.getOriginalType().tsym.isInterface();
3394
3395 if (implementing) {
3396 cdef.implementing = List.of(clazz);
3397 } else {
3398 cdef.extending = clazz;
3399 }
3400
3401 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3402 rs.isSerializable(clazztype)) {
3403 localEnv.info.isSerializable = true;
3404 }
3405
3406 attribStat(cdef, localEnv);
3407
3408 List<Type> finalargtypes;
3409 // If an outer instance is given,
3410 // prefix it to the constructor arguments
3411 // and delete it from the new expression
3412 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3413 finalargtypes = argtypes.prepend(tree.encl.type);
3414 } else {
3415 finalargtypes = argtypes;
3416 }
3417
3418 // Reassign clazztype and recompute constructor. As this necessarily involves
3419 // another attribution pass for deferred types in the case of <>, replicate
3420 // them. Original arguments have right decorations already.
3421 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3422 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3423 }
3424
3425 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3426 : cdef.sym.type;
3427 Symbol sym = tree.constructor = rs.resolveConstructor(
3428 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3429 Assert.check(!sym.kind.isResolutionError());
3430 tree.constructor = sym;
3431 tree.constructorType = checkId(tree,
3432 clazztype,
3433 tree.constructor,
3434 localEnv,
3435 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3436 }
3437 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3438 clazztype : types.createErrorType(tree.type);
3439 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3440 chk.validate(tree.typeargs, localEnv);
3441 }
3442
3443 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3444 return new Check.NestedCheckContext(checkContext) {
3445 @Override
3446 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3447 enclosingContext.report(clazz.clazz,
3448 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3449 }
3450 };
3451 }
3452
3453 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3454 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3455 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3456 (!isLocal && !type.tsym.isInner()) ||
3457 (isSuper && env.enclClass.sym.isAnonymous())) {
3458 // nothing to check
3459 return;
3460 }
3461 Symbol res = isLocal ?
3462 rs.findLocalClassOwner(env, type.tsym) :
3463 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3464 if (res.exists()) {
3465 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3466 } else {
3467 log.error(pos, Errors.EnclClassRequired(type.tsym));
3468 }
3469 }
3470
3471 /** Make an attributed null check tree.
3472 */
3473 public JCExpression makeNullCheck(JCExpression arg) {
3474 // optimization: new Outer() can never be null; skip null check
3475 if (arg.getTag() == NEWCLASS)
3476 return arg;
3477 // optimization: X.this is never null; skip null check
3478 Name name = TreeInfo.name(arg);
3479 if (name == names._this || name == names._super) return arg;
3480
3481 JCTree.Tag optag = NULLCHK;
3482 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3483 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3484 tree.type = arg.type;
3485 return tree;
3486 }
3487
3488 public void visitNewArray(JCNewArray tree) {
3489 Type owntype = types.createErrorType(tree.type);
3490 Env<AttrContext> localEnv = env.dup(tree);
3491 Type elemtype;
3492 if (tree.elemtype != null) {
3493 elemtype = attribType(tree.elemtype, localEnv);
3494 chk.validate(tree.elemtype, localEnv);
3495 owntype = elemtype;
3496 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3497 attribExpr(l.head, localEnv, syms.intType);
3498 owntype = new ArrayType(owntype, syms.arrayClass);
3499 }
3500 } else {
3501 // we are seeing an untyped aggregate { ... }
3502 // this is allowed only if the prototype is an array
3503 if (pt().hasTag(ARRAY)) {
3504 elemtype = types.elemtype(pt());
3505 } else {
3506 if (!pt().hasTag(ERROR) &&
3507 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3508 log.error(tree.pos(),
3509 Errors.IllegalInitializerForType(pt()));
3510 }
3511 elemtype = types.createErrorType(pt());
3512 }
3513 }
3514 if (tree.elems != null) {
3515 attribExprs(tree.elems, localEnv, elemtype);
3516 owntype = new ArrayType(elemtype, syms.arrayClass);
3517 }
3518 if (!types.isReifiable(elemtype))
3519 log.error(tree.pos(), Errors.GenericArrayCreation);
3520 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3521 }
3522
3523 /*
3524 * A lambda expression can only be attributed when a target-type is available.
3525 * In addition, if the target-type is that of a functional interface whose
3526 * descriptor contains inference variables in argument position the lambda expression
3527 * is 'stuck' (see DeferredAttr).
3528 */
3529 @Override
3530 public void visitLambda(final JCLambda that) {
3531 boolean wrongContext = false;
3532 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3533 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3534 //lambda only allowed in assignment or method invocation/cast context
3535 log.error(that.pos(), Errors.UnexpectedLambda);
3536 }
3537 resultInfo = recoveryInfo;
3538 wrongContext = true;
3539 }
3540 //create an environment for attribution of the lambda expression
3541 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3542 boolean needsRecovery =
3543 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3544 try {
3545 if (needsRecovery && rs.isSerializable(pt())) {
3546 localEnv.info.isSerializable = true;
3547 localEnv.info.isSerializableLambda = true;
3548 }
3549 List<Type> explicitParamTypes = null;
3550 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3551 //attribute lambda parameters
3552 attribStats(that.params, localEnv);
3553 explicitParamTypes = TreeInfo.types(that.params);
3554 }
3555
3556 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3557 Type currentTarget = targetInfo.target;
3558 Type lambdaType = targetInfo.descriptor;
3559
3560 if (currentTarget.isErroneous()) {
3561 result = that.type = currentTarget;
3562 return;
3563 }
3564
3565 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3566
3567 if (lambdaType.hasTag(FORALL)) {
3568 //lambda expression target desc cannot be a generic method
3569 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3570 kindName(currentTarget.tsym),
3571 currentTarget.tsym);
3572 resultInfo.checkContext.report(that, diags.fragment(msg));
3573 result = that.type = types.createErrorType(pt());
3574 return;
3575 }
3576
3577 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3578 //add param type info in the AST
3579 List<Type> actuals = lambdaType.getParameterTypes();
3580 List<JCVariableDecl> params = that.params;
3581
3582 boolean arityMismatch = false;
3583
3584 while (params.nonEmpty()) {
3585 if (actuals.isEmpty()) {
3586 //not enough actuals to perform lambda parameter inference
3587 arityMismatch = true;
3588 }
3589 //reset previously set info
3590 Type argType = arityMismatch ?
3591 syms.errType :
3592 actuals.head;
3593 if (params.head.isImplicitlyTyped()) {
3594 setSyntheticVariableType(params.head, argType);
3595 }
3596 params.head.sym = null;
3597 actuals = actuals.isEmpty() ?
3598 actuals :
3599 actuals.tail;
3600 params = params.tail;
3601 }
3602
3603 //attribute lambda parameters
3604 attribStats(that.params, localEnv);
3605
3606 if (arityMismatch) {
3607 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3608 result = that.type = types.createErrorType(currentTarget);
3609 return;
3610 }
3611 }
3612
3613 //from this point on, no recovery is needed; if we are in assignment context
3614 //we will be able to attribute the whole lambda body, regardless of errors;
3615 //if we are in a 'check' method context, and the lambda is not compatible
3616 //with the target-type, it will be recovered anyway in Attr.checkId
3617 needsRecovery = false;
3618
3619 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3620 lambdaBodyResult(that, lambdaType, resultInfo);
3621
3622 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3623 attribTree(that.getBody(), localEnv, bodyResultInfo);
3624 } else {
3625 JCBlock body = (JCBlock)that.body;
3626 if (body == breakTree &&
3627 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3628 breakTreeFound(copyEnv(localEnv));
3629 }
3630 attribStats(body.stats, localEnv);
3631 }
3632
3633 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3634
3635 boolean isSpeculativeRound =
3636 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3637
3638 preFlow(that);
3639 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3640
3641 that.type = currentTarget; //avoids recovery at this stage
3642 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3643
3644 if (!isSpeculativeRound) {
3645 //add thrown types as bounds to the thrown types free variables if needed:
3646 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3647 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3648 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3649 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3650 }
3651 }
3652
3653 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3654 }
3655 result = wrongContext ? that.type = types.createErrorType(pt())
3656 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3657 } catch (Types.FunctionDescriptorLookupError ex) {
3658 JCDiagnostic cause = ex.getDiagnostic();
3659 resultInfo.checkContext.report(that, cause);
3660 result = that.type = types.createErrorType(pt());
3661 return;
3662 } catch (CompletionFailure cf) {
3663 chk.completionError(that.pos(), cf);
3664 } catch (Throwable t) {
3665 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3666 //as that would likely cause the same exception again.
3667 needsRecovery = false;
3668 throw t;
3669 } finally {
3670 localEnv.info.scope.leave();
3671 if (needsRecovery) {
3672 Type prevResult = result;
3673 try {
3674 attribTree(that, env, recoveryInfo);
3675 } finally {
3676 if (result == Type.recoveryType) {
3677 result = prevResult;
3678 }
3679 }
3680 }
3681 }
3682 }
3683 //where
3684 class TargetInfo {
3685 Type target;
3686 Type descriptor;
3687
3688 public TargetInfo(Type target, Type descriptor) {
3689 this.target = target;
3690 this.descriptor = descriptor;
3691 }
3692 }
3693
3694 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3695 Type lambdaType;
3696 Type currentTarget = resultInfo.pt;
3697 if (resultInfo.pt != Type.recoveryType) {
3698 /* We need to adjust the target. If the target is an
3699 * intersection type, for example: SAM & I1 & I2 ...
3700 * the target will be updated to SAM
3701 */
3702 currentTarget = targetChecker.visit(currentTarget, that);
3703 if (!currentTarget.isIntersection()) {
3704 if (explicitParamTypes != null) {
3705 currentTarget = infer.instantiateFunctionalInterface(that,
3706 currentTarget, explicitParamTypes, resultInfo.checkContext);
3707 }
3708 currentTarget = types.removeWildcards(currentTarget);
3709 lambdaType = types.findDescriptorType(currentTarget);
3710 } else {
3711 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3712 ListBuffer<Type> components = new ListBuffer<>();
3713 for (Type bound : ict.getExplicitComponents()) {
3714 if (explicitParamTypes != null) {
3715 try {
3716 bound = infer.instantiateFunctionalInterface(that,
3717 bound, explicitParamTypes, resultInfo.checkContext);
3718 } catch (FunctionDescriptorLookupError t) {
3719 // do nothing
3720 }
3721 }
3722 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3723 // bound must be j.l.Object or an interface, but not an annotation
3724 reportIntersectionError(that, "not.an.intf.component", bound);
3725 }
3726 bound = types.removeWildcards(bound);
3727 components.add(bound);
3728 }
3729 currentTarget = types.makeIntersectionType(components.toList());
3730 currentTarget.tsym.flags_field |= INTERFACE;
3731 lambdaType = types.findDescriptorType(currentTarget);
3732 }
3733
3734 } else {
3735 currentTarget = Type.recoveryType;
3736 lambdaType = fallbackDescriptorType(that);
3737 }
3738 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3739 //lambda expression target desc cannot be a generic method
3740 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3741 kindName(currentTarget.tsym),
3742 currentTarget.tsym);
3743 resultInfo.checkContext.report(that, diags.fragment(msg));
3744 currentTarget = types.createErrorType(pt());
3745 }
3746 return new TargetInfo(currentTarget, lambdaType);
3747 }
3748
3749 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3750 resultInfo.checkContext.report(pos,
3751 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3752 }
3753
3754 void preFlow(JCLambda tree) {
3755 attrRecover.doRecovery();
3756 new PostAttrAnalyzer() {
3757 @Override
3758 public void scan(JCTree tree) {
3759 if (tree == null ||
3760 (tree.type != null &&
3761 tree.type == Type.stuckType)) {
3762 //don't touch stuck expressions!
3763 return;
3764 }
3765 super.scan(tree);
3766 }
3767
3768 @Override
3769 public void visitClassDef(JCClassDecl that) {
3770 // or class declaration trees!
3771 }
3772
3773 public void visitLambda(JCLambda that) {
3774 // or lambda expressions!
3775 }
3776 }.scan(tree.body);
3777 }
3778
3779 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3780
3781 @Override
3782 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3783 return t.isIntersection() ?
3784 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3785 }
3786
3787 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3788 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3789 return ict;
3790 }
3791
3792 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3793 ListBuffer<Type> targs = new ListBuffer<>();
3794 ListBuffer<Type> supertypes = new ListBuffer<>();
3795 for (Type i : ict.interfaces_field) {
3796 if (i.isParameterized()) {
3797 targs.appendList(i.tsym.type.allparams());
3798 }
3799 supertypes.append(i.tsym.type);
3800 }
3801 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3802 notionalIntf.allparams_field = targs.toList();
3803 notionalIntf.tsym.flags_field |= INTERFACE;
3804 return notionalIntf.tsym;
3805 }
3806 };
3807
3808 private Type fallbackDescriptorType(JCExpression tree) {
3809 switch (tree.getTag()) {
3810 case LAMBDA:
3811 JCLambda lambda = (JCLambda)tree;
3812 List<Type> argtypes = List.nil();
3813 for (JCVariableDecl param : lambda.params) {
3814 argtypes = param.vartype != null && param.vartype.type != null ?
3815 argtypes.append(param.vartype.type) :
3816 argtypes.append(syms.errType);
3817 }
3818 return new MethodType(argtypes, Type.recoveryType,
3819 List.of(syms.throwableType), syms.methodClass);
3820 case REFERENCE:
3821 return new MethodType(List.nil(), Type.recoveryType,
3822 List.of(syms.throwableType), syms.methodClass);
3823 default:
3824 Assert.error("Cannot get here!");
3825 }
3826 return null;
3827 }
3828
3829 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3830 final InferenceContext inferenceContext, final Type... ts) {
3831 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3832 }
3833
3834 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3835 final InferenceContext inferenceContext, final List<Type> ts) {
3836 if (inferenceContext.free(ts)) {
3837 inferenceContext.addFreeTypeListener(ts,
3838 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3839 } else {
3840 for (Type t : ts) {
3841 rs.checkAccessibleType(env, t);
3842 }
3843 }
3844 }
3845
3846 /**
3847 * Lambda/method reference have a special check context that ensures
3848 * that i.e. a lambda return type is compatible with the expected
3849 * type according to both the inherited context and the assignment
3850 * context.
3851 */
3852 class FunctionalReturnContext extends Check.NestedCheckContext {
3853
3854 FunctionalReturnContext(CheckContext enclosingContext) {
3855 super(enclosingContext);
3856 }
3857
3858 @Override
3859 public boolean compatible(Type found, Type req, Warner warn) {
3860 //return type must be compatible in both current context and assignment context
3861 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3862 }
3863
3864 @Override
3865 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3866 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3867 }
3868 }
3869
3870 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3871
3872 JCExpression expr;
3873 boolean expStmtExpected;
3874
3875 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3876 super(enclosingContext);
3877 this.expr = expr;
3878 }
3879
3880 @Override
3881 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3882 if (expStmtExpected) {
3883 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3884 } else {
3885 super.report(pos, details);
3886 }
3887 }
3888
3889 @Override
3890 public boolean compatible(Type found, Type req, Warner warn) {
3891 //a void return is compatible with an expression statement lambda
3892 if (req.hasTag(VOID)) {
3893 expStmtExpected = true;
3894 return TreeInfo.isExpressionStatement(expr);
3895 } else {
3896 return super.compatible(found, req, warn);
3897 }
3898 }
3899 }
3900
3901 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3902 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3903 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3904 new FunctionalReturnContext(resultInfo.checkContext);
3905
3906 return descriptor.getReturnType() == Type.recoveryType ?
3907 recoveryInfo :
3908 new ResultInfo(KindSelector.VAL,
3909 descriptor.getReturnType(), funcContext);
3910 }
3911
3912 /**
3913 * Lambda compatibility. Check that given return types, thrown types, parameter types
3914 * are compatible with the expected functional interface descriptor. This means that:
3915 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3916 * types must be compatible with the return type of the expected descriptor.
3917 */
3918 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3919 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3920
3921 //return values have already been checked - but if lambda has no return
3922 //values, we must ensure that void/value compatibility is correct;
3923 //this amounts at checking that, if a lambda body can complete normally,
3924 //the descriptor's return type must be void
3925 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3926 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3927 Fragment msg =
3928 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3929 checkContext.report(tree,
3930 diags.fragment(msg));
3931 }
3932
3933 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3934 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3935 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3936 }
3937 }
3938
3939 /* This method returns an environment to be used to attribute a lambda
3940 * expression.
3941 *
3942 * The owner of this environment is a method symbol. If the current owner
3943 * is not a method (e.g. if the lambda occurs in a field initializer), then
3944 * a synthetic method symbol owner is created.
3945 */
3946 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3947 Env<AttrContext> lambdaEnv;
3948 Symbol owner = env.info.scope.owner;
3949 if (owner.kind == VAR && owner.owner.kind == TYP) {
3950 // If the lambda is nested in a field initializer, we need to create a fake init method.
3951 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3952 // init symbol's owner).
3953 ClassSymbol enclClass = owner.enclClass();
3954 Name initName = owner.isStatic() ? names.clinit : names.init;
3955 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3956 initName, initBlockType, enclClass);
3957 initSym.params = List.nil();
3958 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3959 } else {
3960 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3961 }
3962 lambdaEnv.info.yieldResult = null;
3963 lambdaEnv.info.isLambda = true;
3964 return lambdaEnv;
3965 }
3966
3967 @Override
3968 public void visitReference(final JCMemberReference that) {
3969 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3970 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3971 //method reference only allowed in assignment or method invocation/cast context
3972 log.error(that.pos(), Errors.UnexpectedMref);
3973 }
3974 result = that.type = types.createErrorType(pt());
3975 return;
3976 }
3977 final Env<AttrContext> localEnv = env.dup(that);
3978 try {
3979 //attribute member reference qualifier - if this is a constructor
3980 //reference, the expected kind must be a type
3981 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3982
3983 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3984 exprType = chk.checkConstructorRefType(that.expr, exprType);
3985 if (!exprType.isErroneous() &&
3986 exprType.isRaw() &&
3987 that.typeargs != null) {
3988 log.error(that.expr.pos(),
3989 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3990 Fragments.MrefInferAndExplicitParams));
3991 exprType = types.createErrorType(exprType);
3992 }
3993 }
3994
3995 if (exprType.isErroneous()) {
3996 //if the qualifier expression contains problems,
3997 //give up attribution of method reference
3998 result = that.type = exprType;
3999 return;
4000 }
4001
4002 if (TreeInfo.isStaticSelector(that.expr, names)) {
4003 //if the qualifier is a type, validate it; raw warning check is
4004 //omitted as we don't know at this stage as to whether this is a
4005 //raw selector (because of inference)
4006 chk.validate(that.expr, env, false);
4007 } else {
4008 Symbol lhsSym = TreeInfo.symbol(that.expr);
4009 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
4010 }
4011 //attrib type-arguments
4012 List<Type> typeargtypes = List.nil();
4013 if (that.typeargs != null) {
4014 typeargtypes = attribTypes(that.typeargs, localEnv);
4015 }
4016
4017 boolean isTargetSerializable =
4018 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4019 rs.isSerializable(pt());
4020 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
4021 Type currentTarget = targetInfo.target;
4022 Type desc = targetInfo.descriptor;
4023
4024 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
4025 List<Type> argtypes = desc.getParameterTypes();
4026 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
4027
4028 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
4029 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
4030 }
4031
4032 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
4033 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
4034 try {
4035 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
4036 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
4037 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
4038 } finally {
4039 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
4040 }
4041
4042 Symbol refSym = refResult.fst;
4043 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
4044
4045 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
4046 * JDK-8075541
4047 */
4048 if (refSym.kind != MTH) {
4049 boolean targetError;
4050 switch (refSym.kind) {
4051 case ABSENT_MTH:
4052 targetError = false;
4053 break;
4054 case WRONG_MTH:
4055 case WRONG_MTHS:
4056 case AMBIGUOUS:
4057 case HIDDEN:
4058 case STATICERR:
4059 targetError = true;
4060 break;
4061 default:
4062 Assert.error("unexpected result kind " + refSym.kind);
4063 targetError = false;
4064 }
4065
4066 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
4067 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
4068 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
4069
4070 JCDiagnostic diag = diags.create(log.currentSource(), that,
4071 targetError ?
4072 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
4073 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
4074
4075 if (targetError && currentTarget == Type.recoveryType) {
4076 //a target error doesn't make sense during recovery stage
4077 //as we don't know what actual parameter types are
4078 result = that.type = currentTarget;
4079 return;
4080 } else {
4081 if (targetError) {
4082 resultInfo.checkContext.report(that, diag);
4083 } else {
4084 log.report(diag);
4085 }
4086 result = that.type = types.createErrorType(currentTarget);
4087 return;
4088 }
4089 }
4090
4091 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
4092 that.kind = lookupHelper.referenceKind(that.sym);
4093 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
4094
4095 if (desc.getReturnType() == Type.recoveryType) {
4096 // stop here
4097 result = that.type = currentTarget;
4098 return;
4099 }
4100
4101 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
4102 checkNewInnerClass(that.pos(), env, exprType, false);
4103 }
4104
4105 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
4106
4107 if (that.getMode() == ReferenceMode.INVOKE &&
4108 TreeInfo.isStaticSelector(that.expr, names) &&
4109 that.kind.isUnbound() &&
4110 lookupHelper.site.isRaw()) {
4111 chk.checkRaw(that.expr, localEnv);
4112 }
4113
4114 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
4115 exprType.getTypeArguments().nonEmpty()) {
4116 //static ref with class type-args
4117 log.error(that.expr.pos(),
4118 Errors.InvalidMref(Kinds.kindName(that.getMode()),
4119 Fragments.StaticMrefWithTargs));
4120 result = that.type = types.createErrorType(currentTarget);
4121 return;
4122 }
4123
4124 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
4125 // Check that super-qualified symbols are not abstract (JLS)
4126 rs.checkNonAbstract(that.pos(), that.sym);
4127 }
4128
4129 if (isTargetSerializable) {
4130 chk.checkAccessFromSerializableElement(that, true);
4131 }
4132 }
4133
4134 ResultInfo checkInfo =
4135 resultInfo.dup(newMethodTemplate(
4136 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
4137 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
4138 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
4139
4140 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
4141
4142 if (that.kind.isUnbound() &&
4143 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
4144 //re-generate inference constraints for unbound receiver
4145 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
4146 //cannot happen as this has already been checked - we just need
4147 //to regenerate the inference constraints, as that has been lost
4148 //as a result of the call to inferenceContext.save()
4149 Assert.error("Can't get here");
4150 }
4151 }
4152
4153 if (!refType.isErroneous()) {
4154 refType = types.createMethodTypeWithReturn(refType,
4155 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
4156 }
4157
4158 //go ahead with standard method reference compatibility check - note that param check
4159 //is a no-op (as this has been taken care during method applicability)
4160 boolean isSpeculativeRound =
4161 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
4162
4163 that.type = currentTarget; //avoids recovery at this stage
4164 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
4165 if (!isSpeculativeRound) {
4166 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
4167 }
4168 chk.checkRequiresIdentity(that, localEnv.info.lint);
4169 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
4170 } catch (Types.FunctionDescriptorLookupError ex) {
4171 JCDiagnostic cause = ex.getDiagnostic();
4172 resultInfo.checkContext.report(that, cause);
4173 result = that.type = types.createErrorType(pt());
4174 return;
4175 }
4176 }
4177 //where
4178 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
4179 //if this is a constructor reference, the expected kind must be a type
4180 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
4181 KindSelector.VAL_TYP : KindSelector.TYP,
4182 Type.noType);
4183 }
4184
4185
4186 @SuppressWarnings("fallthrough")
4187 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
4188 InferenceContext inferenceContext = checkContext.inferenceContext();
4189 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
4190
4191 Type resType;
4192 switch (tree.getMode()) {
4193 case NEW:
4194 if (!tree.expr.type.isRaw()) {
4195 resType = tree.expr.type;
4196 break;
4197 }
4198 default:
4199 resType = refType.getReturnType();
4200 }
4201
4202 Type incompatibleReturnType = resType;
4203
4204 if (returnType.hasTag(VOID)) {
4205 incompatibleReturnType = null;
4206 }
4207
4208 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
4209 if (resType.isErroneous() ||
4210 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
4211 checkContext.checkWarner(tree, resType, returnType))) {
4212 incompatibleReturnType = null;
4213 }
4214 }
4215
4216 if (incompatibleReturnType != null) {
4217 Fragment msg =
4218 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
4219 checkContext.report(tree, diags.fragment(msg));
4220 } else {
4221 if (inferenceContext.free(refType)) {
4222 // we need to wait for inference to finish and then replace inference vars in the referent type
4223 inferenceContext.addFreeTypeListener(List.of(refType),
4224 instantiatedContext -> {
4225 tree.referentType = instantiatedContext.asInstType(refType);
4226 });
4227 } else {
4228 tree.referentType = refType;
4229 }
4230 }
4231
4232 if (!speculativeAttr) {
4233 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
4234 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
4235 }
4236 }
4237 }
4238
4239 boolean checkExConstraints(
4240 List<Type> thrownByFuncExpr,
4241 List<Type> thrownAtFuncType,
4242 InferenceContext inferenceContext) {
4243 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
4244 * are not proper types
4245 */
4246 List<Type> nonProperList = thrownAtFuncType.stream()
4247 .filter(e -> inferenceContext.free(e)).collect(List.collector());
4248 List<Type> properList = thrownAtFuncType.diff(nonProperList);
4249
4250 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
4251 * in the throws clause of the invocation type of the method reference's compile-time
4252 * declaration
4253 */
4254 List<Type> checkedList = thrownByFuncExpr.stream()
4255 .filter(e -> chk.isChecked(e)).collect(List.collector());
4256
4257 /** If n = 0 (the function type's throws clause consists only of proper types), then
4258 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
4259 * in the throws clause, the constraint reduces to false; otherwise, the constraint
4260 * reduces to true
4261 */
4262 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
4263 for (Type checked : checkedList) {
4264 boolean isSubtype = false;
4265 for (Type proper : properList) {
4266 if (types.isSubtype(checked, proper)) {
4267 isSubtype = true;
4268 break;
4269 }
4270 }
4271 if (!isSubtype) {
4272 uncaughtByProperTypes.add(checked);
4273 }
4274 }
4275
4276 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
4277 return false;
4278 }
4279
4280 /** If n > 0, the constraint reduces to a set of subtyping constraints:
4281 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
4282 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
4283 */
4284 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
4285 uncaughtByProperTypes.forEach(checkedEx -> {
4286 nonProperAsUndet.forEach(nonProper -> {
4287 types.isSubtype(checkedEx, nonProper);
4288 });
4289 });
4290
4291 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
4292 */
4293 nonProperAsUndet.stream()
4294 .filter(t -> t.hasTag(UNDETVAR))
4295 .forEach(t -> ((UndetVar)t).setThrow());
4296 return true;
4297 }
4298
4299 /**
4300 * Set functional type info on the underlying AST. Note: as the target descriptor
4301 * might contain inference variables, we might need to register an hook in the
4302 * current inference context.
4303 */
4304 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4305 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4306 if (checkContext.inferenceContext().free(descriptorType)) {
4307 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4308 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4309 inferenceContext.asInstType(primaryTarget), checkContext));
4310 } else {
4311 fExpr.owner = env.info.scope.owner;
4312 if (pt.hasTag(CLASS)) {
4313 fExpr.target = primaryTarget;
4314 }
4315 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4316 pt != Type.recoveryType) {
4317 //check that functional interface class is well-formed
4318 try {
4319 /* Types.makeFunctionalInterfaceClass() may throw an exception
4320 * when it's executed post-inference. See the listener code
4321 * above.
4322 */
4323 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4324 names.empty, fExpr.target, ABSTRACT);
4325 if (csym != null) {
4326 chk.checkImplementations(env.tree, csym, csym);
4327 try {
4328 //perform an additional functional interface check on the synthetic class,
4329 //as there may be spurious errors for raw targets - because of existing issues
4330 //with membership and inheritance (see JDK-8074570).
4331 csym.flags_field |= INTERFACE;
4332 types.findDescriptorType(csym.type);
4333 } catch (FunctionDescriptorLookupError err) {
4334 resultInfo.checkContext.report(fExpr,
4335 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4336 }
4337 }
4338 } catch (Types.FunctionDescriptorLookupError ex) {
4339 JCDiagnostic cause = ex.getDiagnostic();
4340 resultInfo.checkContext.report(env.tree, cause);
4341 }
4342 }
4343 }
4344 }
4345
4346 public void visitParens(JCParens tree) {
4347 Type owntype = attribTree(tree.expr, env, resultInfo);
4348 result = check(tree, owntype, pkind(), resultInfo);
4349 Symbol sym = TreeInfo.symbol(tree);
4350 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4351 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4352 }
4353
4354 public void visitAssign(JCAssign tree) {
4355 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4356 Type capturedType = capture(owntype);
4357 attribExpr(tree.rhs, env, owntype);
4358 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4359 }
4360
4361 public void visitAssignop(JCAssignOp tree) {
4362 // Attribute arguments.
4363 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4364 Type operand = attribExpr(tree.rhs, env);
4365 // Find operator.
4366 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4367 if (operator != operators.noOpSymbol &&
4368 !owntype.isErroneous() &&
4369 !operand.isErroneous()) {
4370 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4371 chk.checkCastable(tree.rhs.pos(),
4372 operator.type.getReturnType(),
4373 owntype);
4374 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4375 }
4376 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4377 }
4378
4379 public void visitUnary(JCUnary tree) {
4380 // Attribute arguments.
4381 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4382 ? attribTree(tree.arg, env, varAssignmentInfo)
4383 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4384
4385 // Find operator.
4386 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4387 Type owntype = types.createErrorType(tree.type);
4388 if (operator != operators.noOpSymbol &&
4389 !argtype.isErroneous()) {
4390 owntype = (tree.getTag().isIncOrDecUnaryOp())
4391 ? tree.arg.type
4392 : operator.type.getReturnType();
4393 int opc = operator.opcode;
4394
4395 // If the argument is constant, fold it.
4396 if (argtype.constValue() != null) {
4397 Type ctype = cfolder.fold1(opc, argtype);
4398 if (ctype != null) {
4399 owntype = cfolder.coerce(ctype, owntype);
4400 }
4401 }
4402 }
4403 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4404 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4405 }
4406
4407 public void visitBinary(JCBinary tree) {
4408 // Attribute arguments.
4409 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4410 // x && y
4411 // include x's bindings when true in y
4412
4413 // x || y
4414 // include x's bindings when false in y
4415
4416 MatchBindings lhsBindings = matchBindings;
4417 List<BindingSymbol> propagatedBindings;
4418 switch (tree.getTag()) {
4419 case AND:
4420 propagatedBindings = lhsBindings.bindingsWhenTrue;
4421 break;
4422 case OR:
4423 propagatedBindings = lhsBindings.bindingsWhenFalse;
4424 break;
4425 default:
4426 propagatedBindings = List.nil();
4427 break;
4428 }
4429 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4430 Type right;
4431 try {
4432 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4433 } finally {
4434 rhsEnv.info.scope.leave();
4435 }
4436
4437 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4438
4439 // Find operator.
4440 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4441 Type owntype = types.createErrorType(tree.type);
4442 if (operator != operators.noOpSymbol &&
4443 !left.isErroneous() &&
4444 !right.isErroneous()) {
4445 owntype = operator.type.getReturnType();
4446 int opc = operator.opcode;
4447 // If both arguments are constants, fold them.
4448 if (left.constValue() != null && right.constValue() != null) {
4449 Type ctype = cfolder.fold2(opc, left, right);
4450 if (ctype != null) {
4451 owntype = cfolder.coerce(ctype, owntype);
4452 }
4453 }
4454
4455 // Check that argument types of a reference ==, != are
4456 // castable to each other, (JLS 15.21). Note: unboxing
4457 // comparisons will not have an acmp* opc at this point.
4458 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4459 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4460 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4461 }
4462 }
4463
4464 chk.checkDivZero(tree.rhs.pos(), operator, right);
4465 }
4466 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4467 }
4468
4469 public void visitTypeCast(final JCTypeCast tree) {
4470 Type clazztype = attribType(tree.clazz, env);
4471 chk.validate(tree.clazz, env, false);
4472 chk.checkRequiresIdentity(tree, env.info.lint);
4473 //a fresh environment is required for 292 inference to work properly ---
4474 //see Infer.instantiatePolymorphicSignatureInstance()
4475 Env<AttrContext> localEnv = env.dup(tree);
4476 //should we propagate the target type?
4477 final ResultInfo castInfo;
4478 JCExpression expr = TreeInfo.skipParens(tree.expr);
4479 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4480 if (isPoly) {
4481 //expression is a poly - we need to propagate target type info
4482 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4483 new Check.NestedCheckContext(resultInfo.checkContext) {
4484 @Override
4485 public boolean compatible(Type found, Type req, Warner warn) {
4486 return types.isCastable(found, req, warn);
4487 }
4488 });
4489 } else {
4490 //standalone cast - target-type info is not propagated
4491 castInfo = unknownExprInfo;
4492 }
4493 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4494 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4495 if (exprtype.constValue() != null)
4496 owntype = cfolder.coerce(exprtype, owntype);
4497 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4498 if (!isPoly)
4499 chk.checkRedundantCast(localEnv, tree);
4500 }
4501
4502 public void visitTypeTest(JCInstanceOf tree) {
4503 Type exprtype = attribExpr(tree.expr, env);
4504 if (exprtype.isPrimitive()) {
4505 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4506 } else {
4507 exprtype = chk.checkNullOrRefType(
4508 tree.expr.pos(), exprtype);
4509 }
4510 Type clazztype;
4511 JCTree typeTree;
4512 if (tree.pattern.getTag() == BINDINGPATTERN ||
4513 tree.pattern.getTag() == RECORDPATTERN) {
4514 attribExpr(tree.pattern, env, exprtype);
4515 clazztype = tree.pattern.type;
4516 if (types.isSubtype(exprtype, clazztype) &&
4517 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4518 tree.pattern.getTag() != RECORDPATTERN) {
4519 if (!allowUnconditionalPatternsInstanceOf) {
4520 log.error(tree.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4521 }
4522 }
4523 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4524 } else {
4525 clazztype = attribType(tree.pattern, env);
4526 typeTree = tree.pattern;
4527 chk.validate(typeTree, env, false);
4528 }
4529 if (clazztype.isPrimitive()) {
4530 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4531 } else {
4532 if (!clazztype.hasTag(TYPEVAR)) {
4533 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4534 }
4535 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4536 boolean valid = false;
4537 if (allowReifiableTypesInInstanceof) {
4538 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4539 } else {
4540 log.error(tree.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4541 allowReifiableTypesInInstanceof = true;
4542 }
4543 if (!valid) {
4544 clazztype = types.createErrorType(clazztype);
4545 }
4546 }
4547 }
4548 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4549 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4550 }
4551
4552 private boolean checkCastablePattern(DiagnosticPosition pos,
4553 Type exprType,
4554 Type pattType) {
4555 Warner warner = new Warner();
4556 // if any type is erroneous, the problem is reported elsewhere
4557 if (exprType.isErroneous() || pattType.isErroneous()) {
4558 return false;
4559 }
4560 if (!types.isCastable(exprType, pattType, warner)) {
4561 chk.basicHandler.report(pos,
4562 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4563 return false;
4564 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4565 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4566 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4567 return true;
4568 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4569 log.error(pos,
4570 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4571 return false;
4572 } else {
4573 return true;
4574 }
4575 }
4576
4577 @Override
4578 public void visitAnyPattern(JCAnyPattern tree) {
4579 result = tree.type = resultInfo.pt;
4580 }
4581
4582 public void visitBindingPattern(JCBindingPattern tree) {
4583 Type type;
4584 if (tree.var.vartype != null) {
4585 type = attribType(tree.var.vartype, env);
4586 } else {
4587 type = resultInfo.pt;
4588 }
4589 tree.type = tree.var.type = type;
4590 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4591 v.pos = tree.pos;
4592 tree.var.sym = v;
4593 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4594 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4595 }
4596 chk.validate(tree.var.vartype, env, true);
4597 if (tree.var.isImplicitlyTyped()) {
4598 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4599 : type);
4600 }
4601 annotate.annotateLater(tree.var.mods.annotations, env, v);
4602 if (!tree.var.isImplicitlyTyped()) {
4603 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v);
4604 }
4605 annotate.flush();
4606 result = tree.type;
4607 if (v.isUnnamedVariable()) {
4608 matchBindings = MatchBindingsComputer.EMPTY;
4609 } else {
4610 matchBindings = new MatchBindings(List.of(v), List.nil());
4611 }
4612 chk.checkRequiresIdentity(tree, env.info.lint);
4613 }
4614
4615 @Override
4616 public void visitRecordPattern(JCRecordPattern tree) {
4617 Type site;
4618
4619 if (tree.deconstructor == null) {
4620 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4621 tree.record = syms.errSymbol;
4622 site = tree.type = types.createErrorType(tree.record.type);
4623 } else {
4624 Type type = attribType(tree.deconstructor, env);
4625 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4626 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4627 if (inferred == null) {
4628 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4629 } else {
4630 type = inferred;
4631 }
4632 }
4633 tree.type = tree.deconstructor.type = type;
4634 site = types.capture(tree.type);
4635 }
4636
4637 List<Type> expectedRecordTypes;
4638 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4639 ClassSymbol record = (ClassSymbol) site.tsym;
4640 expectedRecordTypes = record.getRecordComponents()
4641 .stream()
4642 .map(rc -> types.memberType(site, rc))
4643 .map(t -> types.upward(t, types.captures(t)).baseType())
4644 .collect(List.collector());
4645 tree.record = record;
4646 } else {
4647 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4648 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4649 .limit(tree.nested.size())
4650 .collect(List.collector());
4651 tree.record = syms.errSymbol;
4652 }
4653 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4654 List<Type> recordTypes = expectedRecordTypes;
4655 List<JCPattern> nestedPatterns = tree.nested;
4656 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4657 try {
4658 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4659 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4660 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4661 outBindings.addAll(matchBindings.bindingsWhenTrue);
4662 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4663 nestedPatterns = nestedPatterns.tail;
4664 recordTypes = recordTypes.tail;
4665 }
4666 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4667 while (nestedPatterns.nonEmpty()) {
4668 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4669 nestedPatterns = nestedPatterns.tail;
4670 }
4671 List<Type> nestedTypes =
4672 tree.nested.stream().map(p -> p.type).collect(List.collector());
4673 log.error(tree.pos(),
4674 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4675 nestedTypes));
4676 }
4677 } finally {
4678 localEnv.info.scope.leave();
4679 }
4680 chk.validate(tree.deconstructor, env, true);
4681 result = tree.type;
4682 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4683 }
4684
4685 public void visitIndexed(JCArrayAccess tree) {
4686 Type owntype = types.createErrorType(tree.type);
4687 Type atype = attribExpr(tree.indexed, env);
4688 attribExpr(tree.index, env, syms.intType);
4689 if (types.isArray(atype))
4690 owntype = types.elemtype(atype);
4691 else if (!atype.hasTag(ERROR))
4692 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4693 if (!pkind().contains(KindSelector.VAL))
4694 owntype = capture(owntype);
4695 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4696 }
4697
4698 public void visitIdent(JCIdent tree) {
4699 Symbol sym;
4700
4701 // Find symbol
4702 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4703 // If we are looking for a method, the prototype `pt' will be a
4704 // method type with the type of the call's arguments as parameters.
4705 env.info.pendingResolutionPhase = null;
4706 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4707 } else if (tree.sym != null && tree.sym.kind != VAR) {
4708 sym = tree.sym;
4709 } else {
4710 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4711 }
4712 tree.sym = sym;
4713
4714 // Also find the environment current for the class where
4715 // sym is defined (`symEnv').
4716 Env<AttrContext> symEnv = env;
4717 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4718 sym.kind.matches(KindSelector.VAL_MTH) &&
4719 sym.owner.kind == TYP &&
4720 tree.name != names._this && tree.name != names._super) {
4721
4722 // Find environment in which identifier is defined.
4723 while (symEnv.outer != null &&
4724 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4725 symEnv = symEnv.outer;
4726 }
4727 }
4728
4729 // If symbol is a variable, ...
4730 if (sym.kind == VAR) {
4731 VarSymbol v = (VarSymbol)sym;
4732
4733 // ..., evaluate its initializer, if it has one, and check for
4734 // illegal forward reference.
4735 checkInit(tree, env, v, false);
4736
4737 // If we are expecting a variable (as opposed to a value), check
4738 // that the variable is assignable in the current environment.
4739 if (KindSelector.ASG.subset(pkind()))
4740 checkAssignable(tree.pos(), v, null, env);
4741 }
4742
4743 Env<AttrContext> env1 = env;
4744 if (sym.kind != ERR && sym.kind != TYP &&
4745 sym.owner != null && sym.owner != env1.enclClass.sym) {
4746 // If the found symbol is inaccessible, then it is
4747 // accessed through an enclosing instance. Locate this
4748 // enclosing instance:
4749 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4750 env1 = env1.outer;
4751 }
4752
4753 if (env.info.isSerializable) {
4754 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4755 }
4756
4757 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4758 }
4759
4760 public void visitSelect(JCFieldAccess tree) {
4761 // Determine the expected kind of the qualifier expression.
4762 KindSelector skind = KindSelector.NIL;
4763 if (tree.name == names._this || tree.name == names._super ||
4764 tree.name == names._class)
4765 {
4766 skind = KindSelector.TYP;
4767 } else {
4768 if (pkind().contains(KindSelector.PCK))
4769 skind = KindSelector.of(skind, KindSelector.PCK);
4770 if (pkind().contains(KindSelector.TYP))
4771 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4772 if (pkind().contains(KindSelector.VAL_MTH))
4773 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4774 }
4775
4776 // Attribute the qualifier expression, and determine its symbol (if any).
4777 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4778 Assert.check(site == tree.selected.type);
4779 if (!pkind().contains(KindSelector.TYP_PCK))
4780 site = capture(site); // Capture field access
4781
4782 // don't allow T.class T[].class, etc
4783 if (skind == KindSelector.TYP) {
4784 Type elt = site;
4785 while (elt.hasTag(ARRAY))
4786 elt = ((ArrayType)elt).elemtype;
4787 if (elt.hasTag(TYPEVAR)) {
4788 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4789 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4790 tree.sym = tree.type.tsym;
4791 return ;
4792 }
4793 }
4794
4795 // If qualifier symbol is a type or `super', assert `selectSuper'
4796 // for the selection. This is relevant for determining whether
4797 // protected symbols are accessible.
4798 Symbol sitesym = TreeInfo.symbol(tree.selected);
4799 boolean selectSuperPrev = env.info.selectSuper;
4800 env.info.selectSuper =
4801 sitesym != null &&
4802 sitesym.name == names._super;
4803
4804 // Determine the symbol represented by the selection.
4805 env.info.pendingResolutionPhase = null;
4806 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4807 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4808 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4809 sym = syms.errSymbol;
4810 }
4811 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4812 site = capture(site);
4813 sym = selectSym(tree, sitesym, site, env, resultInfo);
4814 }
4815 boolean varArgs = env.info.lastResolveVarargs();
4816 tree.sym = sym;
4817
4818 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4819 site = types.skipTypeVars(site, true);
4820 }
4821
4822 // If that symbol is a variable, ...
4823 if (sym.kind == VAR) {
4824 VarSymbol v = (VarSymbol)sym;
4825
4826 // ..., evaluate its initializer, if it has one, and check for
4827 // illegal forward reference.
4828 checkInit(tree, env, v, true);
4829
4830 // If we are expecting a variable (as opposed to a value), check
4831 // that the variable is assignable in the current environment.
4832 if (KindSelector.ASG.subset(pkind()))
4833 checkAssignable(tree.pos(), v, tree.selected, env);
4834 }
4835
4836 if (sitesym != null &&
4837 sitesym.kind == VAR &&
4838 ((VarSymbol)sitesym).isResourceVariable() &&
4839 sym.kind == MTH &&
4840 sym.name.equals(names.close) &&
4841 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4842 log.warning(tree, LintWarnings.TryExplicitCloseCall);
4843 }
4844
4845 // Disallow selecting a type from an expression
4846 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4847 tree.type = check(tree.selected, pt(),
4848 sitesym == null ?
4849 KindSelector.VAL : sitesym.kind.toSelector(),
4850 new ResultInfo(KindSelector.TYP_PCK, pt()));
4851 }
4852
4853 if (isType(sitesym)) {
4854 if (sym.name != names._this && sym.name != names._super) {
4855 // Check if type-qualified fields or methods are static (JLS)
4856 if ((sym.flags() & STATIC) == 0 &&
4857 sym.name != names._super &&
4858 (sym.kind == VAR || sym.kind == MTH)) {
4859 rs.accessBase(rs.new StaticError(sym),
4860 tree.pos(), site, sym.name, true);
4861 }
4862 }
4863 } else if (sym.kind != ERR &&
4864 (sym.flags() & STATIC) != 0 &&
4865 sym.name != names._class) {
4866 // If the qualified item is not a type and the selected item is static, report
4867 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4868 if (!sym.owner.isAnonymous()) {
4869 log.warning(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4870 } else {
4871 log.warning(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4872 }
4873 }
4874
4875 // If we are selecting an instance member via a `super', ...
4876 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4877
4878 // Check that super-qualified symbols are not abstract (JLS)
4879 rs.checkNonAbstract(tree.pos(), sym);
4880
4881 if (site.isRaw()) {
4882 // Determine argument types for site.
4883 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4884 if (site1 != null) site = site1;
4885 }
4886 }
4887
4888 if (env.info.isSerializable) {
4889 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4890 }
4891
4892 env.info.selectSuper = selectSuperPrev;
4893 result = checkId(tree, site, sym, env, resultInfo);
4894 }
4895 //where
4896 /** Determine symbol referenced by a Select expression,
4897 *
4898 * @param tree The select tree.
4899 * @param site The type of the selected expression,
4900 * @param env The current environment.
4901 * @param resultInfo The current result.
4902 */
4903 private Symbol selectSym(JCFieldAccess tree,
4904 Symbol location,
4905 Type site,
4906 Env<AttrContext> env,
4907 ResultInfo resultInfo) {
4908 DiagnosticPosition pos = tree.pos();
4909 Name name = tree.name;
4910 switch (site.getTag()) {
4911 case PACKAGE:
4912 return rs.accessBase(
4913 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4914 pos, location, site, name, true);
4915 case ARRAY:
4916 case CLASS:
4917 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4918 return rs.resolveQualifiedMethod(
4919 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4920 } else if (name == names._this || name == names._super) {
4921 return rs.resolveSelf(pos, env, site.tsym, tree);
4922 } else if (name == names._class) {
4923 // In this case, we have already made sure in
4924 // visitSelect that qualifier expression is a type.
4925 return syms.getClassField(site, types);
4926 } else {
4927 // We are seeing a plain identifier as selector.
4928 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4929 sym = rs.accessBase(sym, pos, location, site, name, true);
4930 return sym;
4931 }
4932 case WILDCARD:
4933 throw new AssertionError(tree);
4934 case TYPEVAR:
4935 // Normally, site.getUpperBound() shouldn't be null.
4936 // It should only happen during memberEnter/attribBase
4937 // when determining the supertype which *must* be
4938 // done before attributing the type variables. In
4939 // other words, we are seeing this illegal program:
4940 // class B<T> extends A<T.foo> {}
4941 Symbol sym = (site.getUpperBound() != null)
4942 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4943 : null;
4944 if (sym == null) {
4945 log.error(pos, Errors.TypeVarCantBeDeref);
4946 return syms.errSymbol;
4947 } else {
4948 // JLS 4.9 specifies the members are derived by inheritance.
4949 // We skip inducing a whole class by filtering members that
4950 // can never be inherited:
4951 Symbol sym2;
4952 if (sym.isPrivate()) {
4953 // Private members
4954 sym2 = rs.new AccessError(env, site, sym);
4955 } else if (sym.owner.isInterface() && sym.kind == MTH && (sym.flags() & STATIC) != 0) {
4956 // Interface static methods
4957 sym2 = rs.new SymbolNotFoundError(ABSENT_MTH);
4958 } else {
4959 sym2 = sym;
4960 }
4961 rs.accessBase(sym2, pos, location, site, name, true);
4962 return sym;
4963 }
4964 case ERROR:
4965 // preserve identifier names through errors
4966 return types.createErrorType(name, site.tsym, site).tsym;
4967 default:
4968 // The qualifier expression is of a primitive type -- only
4969 // .class is allowed for these.
4970 if (name == names._class) {
4971 // In this case, we have already made sure in Select that
4972 // qualifier expression is a type.
4973 return syms.getClassField(site, types);
4974 } else {
4975 log.error(pos, Errors.CantDeref(site));
4976 return syms.errSymbol;
4977 }
4978 }
4979 }
4980
4981 /** Determine type of identifier or select expression and check that
4982 * (1) the referenced symbol is not deprecated
4983 * (2) the symbol's type is safe (@see checkSafe)
4984 * (3) if symbol is a variable, check that its type and kind are
4985 * compatible with the prototype and protokind.
4986 * (4) if symbol is an instance field of a raw type,
4987 * which is being assigned to, issue an unchecked warning if its
4988 * type changes under erasure.
4989 * (5) if symbol is an instance method of a raw type, issue an
4990 * unchecked warning if its argument types change under erasure.
4991 * If checks succeed:
4992 * If symbol is a constant, return its constant type
4993 * else if symbol is a method, return its result type
4994 * otherwise return its type.
4995 * Otherwise return errType.
4996 *
4997 * @param tree The syntax tree representing the identifier
4998 * @param site If this is a select, the type of the selected
4999 * expression, otherwise the type of the current class.
5000 * @param sym The symbol representing the identifier.
5001 * @param env The current environment.
5002 * @param resultInfo The expected result
5003 */
5004 Type checkId(JCTree tree,
5005 Type site,
5006 Symbol sym,
5007 Env<AttrContext> env,
5008 ResultInfo resultInfo) {
5009 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
5010 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
5011 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
5012 }
5013
5014 Type checkMethodIdInternal(JCTree tree,
5015 Type site,
5016 Symbol sym,
5017 Env<AttrContext> env,
5018 ResultInfo resultInfo) {
5019 if (resultInfo.pkind.contains(KindSelector.POLY)) {
5020 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
5021 } else {
5022 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
5023 }
5024 }
5025
5026 Type checkIdInternal(JCTree tree,
5027 Type site,
5028 Symbol sym,
5029 Type pt,
5030 Env<AttrContext> env,
5031 ResultInfo resultInfo) {
5032 Type owntype; // The computed type of this identifier occurrence.
5033 switch (sym.kind) {
5034 case TYP:
5035 // For types, the computed type equals the symbol's type,
5036 // except for two situations:
5037 owntype = sym.type;
5038 if (owntype.hasTag(CLASS)) {
5039 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
5040 Type ownOuter = owntype.getEnclosingType();
5041
5042 // (a) If the symbol's type is parameterized, erase it
5043 // because no type parameters were given.
5044 // We recover generic outer type later in visitTypeApply.
5045 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
5046 owntype = types.erasure(owntype);
5047 }
5048
5049 // (b) If the symbol's type is an inner class, then
5050 // we have to interpret its outer type as a superclass
5051 // of the site type. Example:
5052 //
5053 // class Tree<A> { class Visitor { ... } }
5054 // class PointTree extends Tree<Point> { ... }
5055 // ...PointTree.Visitor...
5056 //
5057 // Then the type of the last expression above is
5058 // Tree<Point>.Visitor.
5059 else if ((ownOuter.hasTag(CLASS) || ownOuter.hasTag(TYPEVAR)) && site != ownOuter) {
5060 Type normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
5061 if (normOuter == null) // perhaps from an import
5062 normOuter = types.erasure(ownOuter);
5063 if (normOuter != ownOuter)
5064 owntype = new ClassType(
5065 normOuter, List.nil(), owntype.tsym,
5066 owntype.getMetadata());
5067 }
5068 }
5069 break;
5070 case VAR:
5071 VarSymbol v = (VarSymbol)sym;
5072
5073 if (env.info.enclVar != null
5074 && v.type.hasTag(NONE)) {
5075 //self reference to implicitly typed variable declaration
5076 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
5077 return tree.type = v.type = types.createErrorType(v.type);
5078 }
5079
5080 // Test (4): if symbol is an instance field of a raw type,
5081 // which is being assigned to, issue an unchecked warning if
5082 // its type changes under erasure.
5083 if (KindSelector.ASG.subset(pkind()) &&
5084 v.owner.kind == TYP &&
5085 (v.flags() & STATIC) == 0 &&
5086 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5087 Type s = types.asOuterSuper(site, v.owner);
5088 if (s != null &&
5089 s.isRaw() &&
5090 !types.isSameType(v.type, v.erasure(types))) {
5091 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
5092 }
5093 }
5094 // The computed type of a variable is the type of the
5095 // variable symbol, taken as a member of the site type.
5096 owntype = (sym.owner.kind == TYP &&
5097 sym.name != names._this && sym.name != names._super)
5098 ? types.memberType(site, sym)
5099 : sym.type;
5100
5101 // If the variable is a constant, record constant value in
5102 // computed type.
5103 if (v.getConstValue() != null && isStaticReference(tree))
5104 owntype = owntype.constType(v.getConstValue());
5105
5106 if (resultInfo.pkind == KindSelector.VAL) {
5107 owntype = capture(owntype); // capture "names as expressions"
5108 }
5109 break;
5110 case MTH: {
5111 owntype = checkMethod(site, sym,
5112 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
5113 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
5114 resultInfo.pt.getTypeArguments());
5115 chk.checkRestricted(tree.pos(), sym);
5116 break;
5117 }
5118 case PCK: case ERR:
5119 owntype = sym.type;
5120 break;
5121 default:
5122 throw new AssertionError("unexpected kind: " + sym.kind +
5123 " in tree " + tree);
5124 }
5125
5126 // Emit a `deprecation' warning if symbol is deprecated.
5127 // (for constructors (but not for constructor references), the error
5128 // was given when the constructor was resolved)
5129
5130 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
5131 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
5132 chk.checkSunAPI(tree.pos(), sym);
5133 chk.checkProfile(tree.pos(), sym);
5134 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
5135 }
5136
5137 if (pt.isErroneous()) {
5138 owntype = types.createErrorType(owntype);
5139 }
5140
5141 // If symbol is a variable, check that its type and
5142 // kind are compatible with the prototype and protokind.
5143 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
5144 }
5145
5146 /** Check that variable is initialized and evaluate the variable's
5147 * initializer, if not yet done. Also check that variable is not
5148 * referenced before it is defined.
5149 * @param tree The tree making up the variable reference.
5150 * @param env The current environment.
5151 * @param v The variable's symbol.
5152 */
5153 private void checkInit(JCTree tree,
5154 Env<AttrContext> env,
5155 VarSymbol v,
5156 boolean onlyWarning) {
5157 // A forward reference is diagnosed if the declaration position
5158 // of the variable is greater than the current tree position
5159 // and the tree and variable definition occur in the same class
5160 // definition. Note that writes don't count as references.
5161 // This check applies only to class and instance
5162 // variables. Local variables follow different scope rules,
5163 // and are subject to definite assignment checking.
5164 Env<AttrContext> initEnv = enclosingInitEnv(env);
5165 if (initEnv != null &&
5166 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
5167 v.owner.kind == TYP &&
5168 v.owner == env.info.scope.owner.enclClass() &&
5169 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
5170 (!env.tree.hasTag(ASSIGN) ||
5171 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
5172 if (!onlyWarning || isStaticEnumField(v)) {
5173 Error errkey = (initEnv.info.enclVar == v) ?
5174 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
5175 log.error(tree.pos(), errkey);
5176 } else if (useBeforeDeclarationWarning) {
5177 Warning warnkey = (initEnv.info.enclVar == v) ?
5178 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
5179 log.warning(tree.pos(), warnkey);
5180 }
5181 }
5182
5183 v.getConstValue(); // ensure initializer is evaluated
5184
5185 checkEnumInitializer(tree, env, v);
5186 }
5187
5188 /**
5189 * Returns the enclosing init environment associated with this env (if any). An init env
5190 * can be either a field declaration env or a static/instance initializer env.
5191 */
5192 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
5193 while (true) {
5194 switch (env.tree.getTag()) {
5195 case VARDEF:
5196 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
5197 if (vdecl.sym.owner.kind == TYP) {
5198 //field
5199 return env;
5200 }
5201 break;
5202 case BLOCK:
5203 if (env.next.tree.hasTag(CLASSDEF)) {
5204 //instance/static initializer
5205 return env;
5206 }
5207 break;
5208 case METHODDEF:
5209 case CLASSDEF:
5210 case TOPLEVEL:
5211 return null;
5212 }
5213 Assert.checkNonNull(env.next);
5214 env = env.next;
5215 }
5216 }
5217
5218 /**
5219 * Check for illegal references to static members of enum. In
5220 * an enum type, constructors and initializers may not
5221 * reference its static members unless they are constant.
5222 *
5223 * @param tree The tree making up the variable reference.
5224 * @param env The current environment.
5225 * @param v The variable's symbol.
5226 * @jls 8.9 Enum Types
5227 */
5228 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
5229 // JLS:
5230 //
5231 // "It is a compile-time error to reference a static field
5232 // of an enum type that is not a compile-time constant
5233 // (15.28) from constructors, instance initializer blocks,
5234 // or instance variable initializer expressions of that
5235 // type. It is a compile-time error for the constructors,
5236 // instance initializer blocks, or instance variable
5237 // initializer expressions of an enum constant e to refer
5238 // to itself or to an enum constant of the same type that
5239 // is declared to the right of e."
5240 if (isStaticEnumField(v)) {
5241 ClassSymbol enclClass = env.info.scope.owner.enclClass();
5242
5243 if (enclClass == null || enclClass.owner == null)
5244 return;
5245
5246 // See if the enclosing class is the enum (or a
5247 // subclass thereof) declaring v. If not, this
5248 // reference is OK.
5249 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
5250 return;
5251
5252 // If the reference isn't from an initializer, then
5253 // the reference is OK.
5254 if (!Resolve.isInitializer(env))
5255 return;
5256
5257 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
5258 }
5259 }
5260
5261 /** Is the given symbol a static, non-constant field of an Enum?
5262 * Note: enum literals should not be regarded as such
5263 */
5264 private boolean isStaticEnumField(VarSymbol v) {
5265 return Flags.isEnum(v.owner) &&
5266 Flags.isStatic(v) &&
5267 !Flags.isConstant(v) &&
5268 v.name != names._class;
5269 }
5270
5271 /**
5272 * Check that method arguments conform to its instantiation.
5273 **/
5274 public Type checkMethod(Type site,
5275 final Symbol sym,
5276 ResultInfo resultInfo,
5277 Env<AttrContext> env,
5278 final List<JCExpression> argtrees,
5279 List<Type> argtypes,
5280 List<Type> typeargtypes) {
5281 // Test (5): if symbol is an instance method of a raw type, issue
5282 // an unchecked warning if its argument types change under erasure.
5283 if ((sym.flags() & STATIC) == 0 &&
5284 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5285 Type s = types.asOuterSuper(site, sym.owner);
5286 if (s != null && s.isRaw() &&
5287 !types.isSameTypes(sym.type.getParameterTypes(),
5288 sym.erasure(types).getParameterTypes())) {
5289 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
5290 }
5291 }
5292
5293 if (env.info.defaultSuperCallSite != null) {
5294 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5295 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5296 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5297 List<MethodSymbol> icand_sup =
5298 types.interfaceCandidates(sup, (MethodSymbol)sym);
5299 if (icand_sup.nonEmpty() &&
5300 icand_sup.head != sym &&
5301 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5302 log.error(env.tree.pos(),
5303 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5304 break;
5305 }
5306 }
5307 env.info.defaultSuperCallSite = null;
5308 }
5309
5310 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5311 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5312 if (app.meth.hasTag(SELECT) &&
5313 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5314 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5315 }
5316 }
5317
5318 // Compute the identifier's instantiated type.
5319 // For methods, we need to compute the instance type by
5320 // Resolve.instantiate from the symbol's type as well as
5321 // any type arguments and value arguments.
5322 Warner noteWarner = new Warner();
5323 try {
5324 Type owntype = rs.checkMethod(
5325 env,
5326 site,
5327 sym,
5328 resultInfo,
5329 argtypes,
5330 typeargtypes,
5331 noteWarner);
5332
5333 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5334 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5335
5336 argtypes = argtypes.map(checkDeferredMap);
5337
5338 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5339 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5340 sym.name,
5341 rs.methodArguments(sym.type.getParameterTypes()),
5342 rs.methodArguments(argtypes.map(checkDeferredMap)),
5343 kindName(sym.location()),
5344 sym.location()));
5345 if (resultInfo.pt != Infer.anyPoly ||
5346 !owntype.hasTag(METHOD) ||
5347 !owntype.isPartial()) {
5348 //if this is not a partially inferred method type, erase return type. Otherwise,
5349 //erasure is carried out in PartiallyInferredMethodType.check().
5350 owntype = new MethodType(owntype.getParameterTypes(),
5351 types.erasure(owntype.getReturnType()),
5352 types.erasure(owntype.getThrownTypes()),
5353 syms.methodClass);
5354 }
5355 }
5356
5357 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5358 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5359 PolyKind.POLY : PolyKind.STANDALONE;
5360 TreeInfo.setPolyKind(env.tree, pkind);
5361
5362 return (resultInfo.pt == Infer.anyPoly) ?
5363 owntype :
5364 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5365 resultInfo.checkContext.inferenceContext());
5366 } catch (Infer.InferenceException ex) {
5367 //invalid target type - propagate exception outwards or report error
5368 //depending on the current check context
5369 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5370 return types.createErrorType(site);
5371 } catch (Resolve.InapplicableMethodException ex) {
5372 final JCDiagnostic diag = ex.getDiagnostic();
5373 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5374 @Override
5375 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5376 return new Pair<>(sym, diag);
5377 }
5378 };
5379 List<Type> argtypes2 = argtypes.map(
5380 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5381 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5382 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5383 log.report(errDiag);
5384 return types.createErrorType(site);
5385 }
5386 }
5387
5388 public void visitLiteral(JCLiteral tree) {
5389 result = check(tree, litType(tree.typetag).constType(tree.value),
5390 KindSelector.VAL, resultInfo);
5391 }
5392 //where
5393 /** Return the type of a literal with given type tag.
5394 */
5395 Type litType(TypeTag tag) {
5396 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5397 }
5398
5399 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5400 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5401 }
5402
5403 public void visitTypeArray(JCArrayTypeTree tree) {
5404 Type etype = attribType(tree.elemtype, env);
5405 Type type = new ArrayType(etype, syms.arrayClass);
5406 result = check(tree, type, KindSelector.TYP, resultInfo);
5407 }
5408
5409 /** Visitor method for parameterized types.
5410 * Bound checking is left until later, since types are attributed
5411 * before supertype structure is completely known
5412 */
5413 public void visitTypeApply(JCTypeApply tree) {
5414 Type owntype = types.createErrorType(tree.type);
5415
5416 // Attribute functor part of application and make sure it's a class.
5417 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5418
5419 // Attribute type parameters
5420 List<Type> actuals = attribTypes(tree.arguments, env);
5421
5422 if (clazztype.hasTag(CLASS)) {
5423 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5424 if (actuals.isEmpty()) //diamond
5425 actuals = formals;
5426
5427 if (actuals.length() == formals.length()) {
5428 List<Type> a = actuals;
5429 List<Type> f = formals;
5430 while (a.nonEmpty()) {
5431 a.head = a.head.withTypeVar(f.head);
5432 a = a.tail;
5433 f = f.tail;
5434 }
5435 // Compute the proper generic outer
5436 Type clazzOuter = clazztype.getEnclosingType();
5437 if (clazzOuter.hasTag(CLASS)) {
5438 Type site;
5439 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5440 if (clazz.hasTag(IDENT)) {
5441 site = env.enclClass.sym.type;
5442 } else if (clazz.hasTag(SELECT)) {
5443 site = ((JCFieldAccess) clazz).selected.type;
5444 } else throw new AssertionError(""+tree);
5445 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5446 if (site.hasTag(CLASS) || site.hasTag(TYPEVAR))
5447 site = types.asEnclosingSuper(site, clazzOuter.tsym);
5448 if (site == null)
5449 site = types.erasure(clazzOuter);
5450 clazzOuter = site;
5451 }
5452 }
5453 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5454 clazztype.getMetadata());
5455 } else {
5456 if (formals.length() != 0) {
5457 log.error(tree.pos(),
5458 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5459 } else {
5460 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5461 }
5462 owntype = types.createErrorType(tree.type);
5463 }
5464 } else if (clazztype.hasTag(ERROR)) {
5465 ErrorType parameterizedErroneous =
5466 new ErrorType(clazztype.getOriginalType(),
5467 clazztype.tsym,
5468 clazztype.getMetadata());
5469
5470 parameterizedErroneous.typarams_field = actuals;
5471 owntype = parameterizedErroneous;
5472 }
5473 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5474 }
5475
5476 public void visitTypeUnion(JCTypeUnion tree) {
5477 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5478 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5479 for (JCExpression typeTree : tree.alternatives) {
5480 Type ctype = attribType(typeTree, env);
5481 ctype = chk.checkType(typeTree.pos(),
5482 chk.checkClassType(typeTree.pos(), ctype),
5483 syms.throwableType);
5484 if (!ctype.isErroneous()) {
5485 //check that alternatives of a union type are pairwise
5486 //unrelated w.r.t. subtyping
5487 if (chk.intersects(ctype, multicatchTypes.toList())) {
5488 for (Type t : multicatchTypes) {
5489 boolean sub = types.isSubtype(ctype, t);
5490 boolean sup = types.isSubtype(t, ctype);
5491 if (sub || sup) {
5492 //assume 'a' <: 'b'
5493 Type a = sub ? ctype : t;
5494 Type b = sub ? t : ctype;
5495 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5496 }
5497 }
5498 }
5499 multicatchTypes.append(ctype);
5500 if (all_multicatchTypes != null)
5501 all_multicatchTypes.append(ctype);
5502 } else {
5503 if (all_multicatchTypes == null) {
5504 all_multicatchTypes = new ListBuffer<>();
5505 all_multicatchTypes.appendList(multicatchTypes);
5506 }
5507 all_multicatchTypes.append(ctype);
5508 }
5509 }
5510 Type t = check(tree, types.lub(multicatchTypes.toList()),
5511 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5512 if (t.hasTag(CLASS)) {
5513 List<Type> alternatives =
5514 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5515 t = new UnionClassType((ClassType) t, alternatives);
5516 }
5517 tree.type = result = t;
5518 }
5519
5520 public void visitTypeIntersection(JCTypeIntersection tree) {
5521 attribTypes(tree.bounds, env);
5522 tree.type = result = checkIntersection(tree, tree.bounds);
5523 }
5524
5525 public void visitTypeParameter(JCTypeParameter tree) {
5526 TypeVar typeVar = (TypeVar) tree.type;
5527
5528 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5529 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5530 }
5531
5532 if (!typeVar.getUpperBound().isErroneous()) {
5533 //fixup type-parameter bound computed in 'attribTypeVariables'
5534 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5535 }
5536 }
5537
5538 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5539 Set<Symbol> boundSet = new HashSet<>();
5540 if (bounds.nonEmpty()) {
5541 // accept class or interface or typevar as first bound.
5542 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5543 boundSet.add(types.erasure(bounds.head.type).tsym);
5544 if (bounds.head.type.isErroneous()) {
5545 return bounds.head.type;
5546 }
5547 else if (bounds.head.type.hasTag(TYPEVAR)) {
5548 // if first bound was a typevar, do not accept further bounds.
5549 if (bounds.tail.nonEmpty()) {
5550 log.error(bounds.tail.head.pos(),
5551 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5552 return bounds.head.type;
5553 }
5554 } else {
5555 // if first bound was a class or interface, accept only interfaces
5556 // as further bounds.
5557 for (JCExpression bound : bounds.tail) {
5558 bound.type = checkBase(bound.type, bound, env, false, true, false);
5559 if (bound.type.isErroneous()) {
5560 bounds = List.of(bound);
5561 }
5562 else if (bound.type.hasTag(CLASS)) {
5563 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5564 }
5565 }
5566 }
5567 }
5568
5569 if (bounds.length() == 0) {
5570 return syms.objectType;
5571 } else if (bounds.length() == 1) {
5572 return bounds.head.type;
5573 } else {
5574 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5575 // ... the variable's bound is a class type flagged COMPOUND
5576 // (see comment for TypeVar.bound).
5577 // In this case, generate a class tree that represents the
5578 // bound class, ...
5579 JCExpression extending;
5580 List<JCExpression> implementing;
5581 if (!bounds.head.type.isInterface()) {
5582 extending = bounds.head;
5583 implementing = bounds.tail;
5584 } else {
5585 extending = null;
5586 implementing = bounds;
5587 }
5588 JCClassDecl cd = make.at(tree).ClassDef(
5589 make.Modifiers(PUBLIC | ABSTRACT),
5590 names.empty, List.nil(),
5591 extending, implementing, List.nil());
5592
5593 ClassSymbol c = (ClassSymbol)owntype.tsym;
5594 Assert.check((c.flags() & COMPOUND) != 0);
5595 cd.sym = c;
5596 c.sourcefile = env.toplevel.sourcefile;
5597
5598 // ... and attribute the bound class
5599 c.flags_field |= UNATTRIBUTED;
5600 Env<AttrContext> cenv = enter.classEnv(cd, env);
5601 typeEnvs.put(c, cenv);
5602 attribClass(c);
5603 return owntype;
5604 }
5605 }
5606
5607 public void visitWildcard(JCWildcard tree) {
5608 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5609 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5610 ? syms.objectType
5611 : attribType(tree.inner, env);
5612 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5613 tree.kind.kind,
5614 syms.boundClass),
5615 KindSelector.TYP, resultInfo);
5616 }
5617
5618 public void visitAnnotation(JCAnnotation tree) {
5619 Assert.error("should be handled in annotate");
5620 }
5621
5622 @Override
5623 public void visitModifiers(JCModifiers tree) {
5624 //error recovery only:
5625 Assert.check(resultInfo.pkind == KindSelector.ERR);
5626
5627 attribAnnotationTypes(tree.annotations, env);
5628 }
5629
5630 public void visitAnnotatedType(JCAnnotatedType tree) {
5631 attribAnnotationTypes(tree.annotations, env);
5632 Type underlyingType = attribType(tree.underlyingType, env);
5633 Type annotatedType = underlyingType.preannotatedType();
5634
5635 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5636 result = tree.type = annotatedType;
5637 }
5638
5639 public void visitErroneous(JCErroneous tree) {
5640 if (tree.errs != null) {
5641 WriteableScope newScope = env.info.scope;
5642
5643 if (env.tree instanceof JCClassDecl) {
5644 Symbol fakeOwner =
5645 new MethodSymbol(BLOCK, names.empty, null,
5646 env.info.scope.owner);
5647 newScope = newScope.dupUnshared(fakeOwner);
5648 }
5649
5650 Env<AttrContext> errEnv =
5651 env.dup(env.tree,
5652 env.info.dup(newScope));
5653 errEnv.info.returnResult = unknownExprInfo;
5654 for (JCTree err : tree.errs)
5655 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5656 }
5657 result = tree.type = syms.errType;
5658 }
5659
5660 /** Default visitor method for all other trees.
5661 */
5662 public void visitTree(JCTree tree) {
5663 throw new AssertionError();
5664 }
5665
5666 /**
5667 * Attribute an env for either a top level tree or class or module declaration.
5668 */
5669 public void attrib(Env<AttrContext> env) {
5670 switch (env.tree.getTag()) {
5671 case MODULEDEF:
5672 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5673 break;
5674 case PACKAGEDEF:
5675 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5676 break;
5677 default:
5678 attribClass(env.tree.pos(), env.enclClass.sym);
5679 }
5680
5681 annotate.flush();
5682
5683 // Now that this tree is attributed, we can calculate the Lint configuration everywhere within it
5684 lintMapper.calculateLints(env.toplevel.sourcefile, env.tree, env.toplevel.endPositions);
5685 }
5686
5687 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5688 try {
5689 annotate.flush();
5690 attribPackage(p);
5691 } catch (CompletionFailure ex) {
5692 chk.completionError(pos, ex);
5693 }
5694 }
5695
5696 void attribPackage(PackageSymbol p) {
5697 attribWithLint(p,
5698 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5699 }
5700
5701 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5702 try {
5703 annotate.flush();
5704 attribModule(m);
5705 } catch (CompletionFailure ex) {
5706 chk.completionError(pos, ex);
5707 }
5708 }
5709
5710 void attribModule(ModuleSymbol m) {
5711 attribWithLint(m, env -> attribStat(env.tree, env));
5712 }
5713
5714 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5715 Env<AttrContext> env = typeEnvs.get(sym);
5716
5717 Env<AttrContext> lintEnv = env;
5718 while (lintEnv.info.lint == null)
5719 lintEnv = lintEnv.next;
5720
5721 Lint lint = lintEnv.info.lint.augment(sym);
5722
5723 Lint prevLint = chk.setLint(lint);
5724 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5725
5726 try {
5727 attrib.accept(env);
5728 } finally {
5729 log.useSource(prev);
5730 chk.setLint(prevLint);
5731 }
5732 }
5733
5734 /** Main method: attribute class definition associated with given class symbol.
5735 * reporting completion failures at the given position.
5736 * @param pos The source position at which completion errors are to be
5737 * reported.
5738 * @param c The class symbol whose definition will be attributed.
5739 */
5740 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5741 try {
5742 annotate.flush();
5743 attribClass(c);
5744 } catch (CompletionFailure ex) {
5745 chk.completionError(pos, ex);
5746 }
5747 }
5748
5749 /** Attribute class definition associated with given class symbol.
5750 * @param c The class symbol whose definition will be attributed.
5751 */
5752 void attribClass(ClassSymbol c) throws CompletionFailure {
5753 if (c.type.hasTag(ERROR)) return;
5754
5755 // Check for cycles in the inheritance graph, which can arise from
5756 // ill-formed class files.
5757 chk.checkNonCyclic(null, c.type);
5758
5759 Type st = types.supertype(c.type);
5760 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5761 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5762 // First, attribute superclass.
5763 if (st.hasTag(CLASS))
5764 attribClass((ClassSymbol)st.tsym);
5765
5766 // Next attribute owner, if it is a class.
5767 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5768 attribClass((ClassSymbol)c.owner);
5769
5770 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5771 }
5772
5773 // The previous operations might have attributed the current class
5774 // if there was a cycle. So we test first whether the class is still
5775 // UNATTRIBUTED.
5776 if ((c.flags_field & UNATTRIBUTED) != 0) {
5777 c.flags_field &= ~UNATTRIBUTED;
5778
5779 // Get environment current at the point of class definition.
5780 Env<AttrContext> env = typeEnvs.get(c);
5781
5782 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5783 // because the annotations were not available at the time the env was created. Therefore,
5784 // we look up the environment chain for the first enclosing environment for which the
5785 // lint value is set. Typically, this is the parent env, but might be further if there
5786 // are any envs created as a result of TypeParameter nodes.
5787 Env<AttrContext> lintEnv = env;
5788 while (lintEnv.info.lint == null)
5789 lintEnv = lintEnv.next;
5790
5791 // Having found the enclosing lint value, we can initialize the lint value for this class
5792 env.info.lint = lintEnv.info.lint.augment(c);
5793
5794 Lint prevLint = chk.setLint(env.info.lint);
5795 JavaFileObject prev = log.useSource(c.sourcefile);
5796 ResultInfo prevReturnRes = env.info.returnResult;
5797
5798 try {
5799 if (c.isSealed() &&
5800 !c.isEnum() &&
5801 !c.isPermittedExplicit &&
5802 c.getPermittedSubclasses().isEmpty()) {
5803 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5804 }
5805
5806 if (c.isSealed()) {
5807 Set<Symbol> permittedTypes = new HashSet<>();
5808 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5809 for (Type subType : c.getPermittedSubclasses()) {
5810 if (subType.isErroneous()) {
5811 // the type already caused errors, don't produce more potentially misleading errors
5812 continue;
5813 }
5814 boolean isTypeVar = false;
5815 if (subType.getTag() == TYPEVAR) {
5816 isTypeVar = true; //error recovery
5817 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5818 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5819 }
5820 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5821 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5822 }
5823 if (permittedTypes.contains(subType.tsym)) {
5824 DiagnosticPosition pos =
5825 env.enclClass.permitting.stream()
5826 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5827 .limit(2).collect(List.collector()).get(1);
5828 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5829 } else {
5830 permittedTypes.add(subType.tsym);
5831 }
5832 if (sealedInUnnamed) {
5833 if (subType.tsym.packge() != c.packge()) {
5834 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5835 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5836 );
5837 }
5838 } else if (subType.tsym.packge().modle != c.packge().modle) {
5839 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5840 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5841 );
5842 }
5843 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5844 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5845 Errors.InvalidPermitsClause(
5846 subType.tsym == c.type.tsym ?
5847 Fragments.MustNotBeSameClass :
5848 Fragments.MustNotBeSupertype(subType)
5849 )
5850 );
5851 } else if (!isTypeVar) {
5852 boolean thisIsASuper = types.directSupertypes(subType)
5853 .stream()
5854 .anyMatch(d -> d.tsym == c);
5855 if (!thisIsASuper) {
5856 if(c.isInterface()) {
5857 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5858 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5859 } else {
5860 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5861 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5862 }
5863 }
5864 }
5865 }
5866 }
5867
5868 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5869 .stream()
5870 .filter(s -> s.tsym.isSealed())
5871 .map(s -> (ClassSymbol) s.tsym)
5872 .collect(List.collector());
5873
5874 if (sealedSupers.isEmpty()) {
5875 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5876 boolean hasErrorSuper = false;
5877
5878 hasErrorSuper |= types.directSupertypes(c.type)
5879 .stream()
5880 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5881
5882 ClassType ct = (ClassType) c.type;
5883
5884 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5885
5886 if (!hasErrorSuper) {
5887 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5888 }
5889 }
5890 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5891 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5892 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5893 }
5894
5895 if (!c.type.isCompound()) {
5896 for (ClassSymbol supertypeSym : sealedSupers) {
5897 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5898 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5899 }
5900 }
5901 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5902 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5903 c.isInterface() ?
5904 Errors.NonSealedOrSealedExpected :
5905 Errors.NonSealedSealedOrFinalExpected);
5906 }
5907 }
5908 }
5909
5910 env.info.returnResult = null;
5911 // java.lang.Enum may not be subclassed by a non-enum
5912 if (st.tsym == syms.enumSym &&
5913 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5914 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5915
5916 // Enums may not be extended by source-level classes
5917 if (st.tsym != null &&
5918 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5919 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5920 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5921 }
5922
5923 if (rs.isSerializable(c.type)) {
5924 env.info.isSerializable = true;
5925 }
5926
5927 if (c.isValueClass()) {
5928 Assert.check(env.tree.hasTag(CLASSDEF));
5929 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5930 }
5931
5932 attribClassBody(env, c);
5933
5934 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5935 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5936 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5937 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5938
5939 if (c.isImplicit()) {
5940 chk.checkHasMain(env.tree.pos(), c);
5941 }
5942 } finally {
5943 env.info.returnResult = prevReturnRes;
5944 log.useSource(prev);
5945 chk.setLint(prevLint);
5946 }
5947
5948 }
5949 }
5950
5951 public void visitImport(JCImport tree) {
5952 // nothing to do
5953 }
5954
5955 public void visitModuleDef(JCModuleDecl tree) {
5956 tree.sym.completeUsesProvides();
5957 ModuleSymbol msym = tree.sym;
5958 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5959 Lint prevLint = chk.setLint(lint);
5960 try {
5961 chk.checkModuleName(tree);
5962 chk.checkDeprecatedAnnotation(tree, msym);
5963 } finally {
5964 chk.setLint(prevLint);
5965 }
5966 }
5967
5968 /** Finish the attribution of a class. */
5969 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5970 JCClassDecl tree = (JCClassDecl)env.tree;
5971 Assert.check(c == tree.sym);
5972
5973 // Validate type parameters, supertype and interfaces.
5974 attribStats(tree.typarams, env);
5975 if (!c.isAnonymous()) {
5976 //already checked if anonymous
5977 chk.validate(tree.typarams, env);
5978 chk.validate(tree.extending, env);
5979 chk.validate(tree.implementing, env);
5980 }
5981
5982 chk.checkRequiresIdentity(tree, env.info.lint);
5983
5984 c.markAbstractIfNeeded(types);
5985
5986 // If this is a non-abstract class, check that it has no abstract
5987 // methods or unimplemented methods of an implemented interface.
5988 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5989 chk.checkAllDefined(tree.pos(), c);
5990 }
5991
5992 if ((c.flags() & ANNOTATION) != 0) {
5993 if (tree.implementing.nonEmpty())
5994 log.error(tree.implementing.head.pos(),
5995 Errors.CantExtendIntfAnnotation);
5996 if (tree.typarams.nonEmpty()) {
5997 log.error(tree.typarams.head.pos(),
5998 Errors.IntfAnnotationCantHaveTypeParams(c));
5999 }
6000
6001 // If this annotation type has a @Repeatable, validate
6002 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
6003 // If this annotation type has a @Repeatable, validate
6004 if (repeatable != null) {
6005 // get diagnostic position for error reporting
6006 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
6007 Assert.checkNonNull(cbPos);
6008
6009 chk.validateRepeatable(c, repeatable, cbPos);
6010 }
6011 } else {
6012 // Check that all extended classes and interfaces
6013 // are compatible (i.e. no two define methods with same arguments
6014 // yet different return types). (JLS 8.4.8.3)
6015 chk.checkCompatibleSupertypes(tree.pos(), c.type);
6016 chk.checkDefaultMethodClashes(tree.pos(), c.type);
6017 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
6018 }
6019
6020 // Check that class does not import the same parameterized interface
6021 // with two different argument lists.
6022 chk.checkClassBounds(tree.pos(), c.type);
6023
6024 tree.type = c.type;
6025
6026 for (List<JCTypeParameter> l = tree.typarams;
6027 l.nonEmpty(); l = l.tail) {
6028 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
6029 }
6030
6031 // Check that a generic class doesn't extend Throwable
6032 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
6033 log.error(tree.extending.pos(), Errors.GenericThrowable);
6034
6035 // Check that all methods which implement some
6036 // method conform to the method they implement.
6037 chk.checkImplementations(tree);
6038
6039 //check that a resource implementing AutoCloseable cannot throw InterruptedException
6040 checkAutoCloseable(tree.pos(), env, c.type);
6041
6042 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
6043 // Attribute declaration
6044 attribStat(l.head, env);
6045 // Check that declarations in inner classes are not static (JLS 8.1.2)
6046 // Make an exception for static constants.
6047 if (!allowRecords &&
6048 c.owner.kind != PCK &&
6049 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
6050 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
6051 VarSymbol sym = null;
6052 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
6053 if (sym == null ||
6054 sym.kind != VAR ||
6055 sym.getConstValue() == null)
6056 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
6057 }
6058 }
6059
6060 // Check for proper placement of super()/this() calls.
6061 chk.checkSuperInitCalls(tree);
6062
6063 // Check for cycles among non-initial constructors.
6064 chk.checkCyclicConstructors(tree);
6065
6066 // Check for cycles among annotation elements.
6067 chk.checkNonCyclicElements(tree);
6068
6069 // Check for proper use of serialVersionUID and other
6070 // serialization-related fields and methods
6071 if (env.info.lint.isEnabled(LintCategory.SERIAL)
6072 && rs.isSerializable(c.type)
6073 && !c.isAnonymous()) {
6074 chk.checkSerialStructure(env, tree, c);
6075 }
6076 // Correctly organize the positions of the type annotations
6077 typeAnnotations.organizeTypeAnnotationsBodies(tree);
6078
6079 // Check type annotations applicability rules
6080 validateTypeAnnotations(tree, false);
6081 }
6082 // where
6083 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
6084 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
6085 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
6086 if (types.isSameType(al.head.annotationType.type, t))
6087 return al.head.pos();
6088 }
6089
6090 return null;
6091 }
6092
6093 private Type capture(Type type) {
6094 return types.capture(type);
6095 }
6096
6097 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
6098 if (type.isErroneous()) {
6099 tree.vartype = make.at(tree.pos()).Erroneous();
6100 } else if (tree.declaredUsingVar()) {
6101 Assert.check(tree.typePos != Position.NOPOS);
6102 tree.vartype = make.at(tree.typePos).Type(type);
6103 } else {
6104 tree.vartype = make.at(tree.pos()).Type(type);
6105 }
6106 }
6107
6108 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
6109 tree.accept(new TypeAnnotationsValidator(sigOnly));
6110 }
6111 //where
6112 private final class TypeAnnotationsValidator extends TreeScanner {
6113
6114 private final boolean sigOnly;
6115 public TypeAnnotationsValidator(boolean sigOnly) {
6116 this.sigOnly = sigOnly;
6117 }
6118
6119 public void visitAnnotation(JCAnnotation tree) {
6120 chk.validateTypeAnnotation(tree, null, false);
6121 super.visitAnnotation(tree);
6122 }
6123 public void visitAnnotatedType(JCAnnotatedType tree) {
6124 if (!tree.underlyingType.type.isErroneous()) {
6125 super.visitAnnotatedType(tree);
6126 }
6127 }
6128 public void visitTypeParameter(JCTypeParameter tree) {
6129 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
6130 scan(tree.bounds);
6131 // Don't call super.
6132 // This is needed because above we call validateTypeAnnotation with
6133 // false, which would forbid annotations on type parameters.
6134 // super.visitTypeParameter(tree);
6135 }
6136 public void visitMethodDef(JCMethodDecl tree) {
6137 if (tree.recvparam != null &&
6138 !tree.recvparam.vartype.type.isErroneous()) {
6139 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
6140 }
6141 if (tree.restype != null && tree.restype.type != null) {
6142 validateAnnotatedType(tree.restype, tree.restype.type);
6143 }
6144 if (sigOnly) {
6145 scan(tree.mods);
6146 scan(tree.restype);
6147 scan(tree.typarams);
6148 scan(tree.recvparam);
6149 scan(tree.params);
6150 scan(tree.thrown);
6151 } else {
6152 scan(tree.defaultValue);
6153 scan(tree.body);
6154 }
6155 }
6156 public void visitVarDef(final JCVariableDecl tree) {
6157 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
6158 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
6159 validateAnnotatedType(tree.vartype, tree.sym.type);
6160 scan(tree.mods);
6161 scan(tree.vartype);
6162 if (!sigOnly) {
6163 scan(tree.init);
6164 }
6165 }
6166 public void visitTypeCast(JCTypeCast tree) {
6167 if (tree.clazz != null && tree.clazz.type != null)
6168 validateAnnotatedType(tree.clazz, tree.clazz.type);
6169 super.visitTypeCast(tree);
6170 }
6171 public void visitTypeTest(JCInstanceOf tree) {
6172 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
6173 validateAnnotatedType(tree.pattern, tree.pattern.type);
6174 super.visitTypeTest(tree);
6175 }
6176 public void visitNewClass(JCNewClass tree) {
6177 if (tree.clazz != null && tree.clazz.type != null) {
6178 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
6179 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
6180 tree.clazz.type.tsym);
6181 }
6182 if (tree.def != null) {
6183 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
6184 }
6185
6186 validateAnnotatedType(tree.clazz, tree.clazz.type);
6187 }
6188 super.visitNewClass(tree);
6189 }
6190 public void visitNewArray(JCNewArray tree) {
6191 if (tree.elemtype != null && tree.elemtype.type != null) {
6192 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
6193 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
6194 tree.elemtype.type.tsym);
6195 }
6196 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
6197 }
6198 super.visitNewArray(tree);
6199 }
6200 public void visitClassDef(JCClassDecl tree) {
6201 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
6202 if (sigOnly) {
6203 scan(tree.mods);
6204 scan(tree.typarams);
6205 scan(tree.extending);
6206 scan(tree.implementing);
6207 }
6208 for (JCTree member : tree.defs) {
6209 if (member.hasTag(Tag.CLASSDEF)) {
6210 continue;
6211 }
6212 scan(member);
6213 }
6214 }
6215 public void visitBlock(JCBlock tree) {
6216 if (!sigOnly) {
6217 scan(tree.stats);
6218 }
6219 }
6220
6221 /* I would want to model this after
6222 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
6223 * and override visitSelect and visitTypeApply.
6224 * However, we only set the annotated type in the top-level type
6225 * of the symbol.
6226 * Therefore, we need to override each individual location where a type
6227 * can occur.
6228 */
6229 private void validateAnnotatedType(final JCTree errtree, final Type type) {
6230 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
6231
6232 if (type.isPrimitiveOrVoid()) {
6233 return;
6234 }
6235
6236 JCTree enclTr = errtree;
6237 Type enclTy = type;
6238
6239 boolean repeat = true;
6240 while (repeat) {
6241 if (enclTr.hasTag(TYPEAPPLY)) {
6242 List<Type> tyargs = enclTy.getTypeArguments();
6243 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
6244 if (trargs.length() > 0) {
6245 // Nothing to do for diamonds
6246 if (tyargs.length() == trargs.length()) {
6247 for (int i = 0; i < tyargs.length(); ++i) {
6248 validateAnnotatedType(trargs.get(i), tyargs.get(i));
6249 }
6250 }
6251 // If the lengths don't match, it's either a diamond
6252 // or some nested type that redundantly provides
6253 // type arguments in the tree.
6254 }
6255
6256 // Look at the clazz part of a generic type
6257 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
6258 }
6259
6260 if (enclTr.hasTag(SELECT)) {
6261 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
6262 if (enclTy != null &&
6263 !enclTy.hasTag(NONE)) {
6264 enclTy = enclTy.getEnclosingType();
6265 }
6266 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
6267 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
6268 if (enclTy == null || enclTy.hasTag(NONE)) {
6269 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
6270 for (JCAnnotation an : at.getAnnotations()) {
6271 if (chk.isTypeAnnotation(an, false)) {
6272 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
6273 }
6274 }
6275 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
6276 if (!onlyTypeAnnotations.isEmpty()) {
6277 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
6278 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
6279 Fragments.TypeAnnotation(onlyTypeAnnotations);
6280 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
6281 type.stripMetadata().annotatedType(onlyTypeAnnotations));
6282 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
6283 type.tsym.owner, annotatedType));
6284 }
6285 repeat = false;
6286 }
6287 enclTr = at.underlyingType;
6288 // enclTy doesn't need to be changed
6289 } else if (enclTr.hasTag(IDENT)) {
6290 repeat = false;
6291 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6292 JCWildcard wc = (JCWildcard) enclTr;
6293 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6294 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6295 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6296 } else {
6297 // Nothing to do for UNBOUND
6298 }
6299 repeat = false;
6300 } else if (enclTr.hasTag(TYPEARRAY)) {
6301 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6302 validateAnnotatedType(art.getType(), art.elemtype.type);
6303 repeat = false;
6304 } else if (enclTr.hasTag(TYPEUNION)) {
6305 JCTypeUnion ut = (JCTypeUnion) enclTr;
6306 for (JCTree t : ut.getTypeAlternatives()) {
6307 validateAnnotatedType(t, t.type);
6308 }
6309 repeat = false;
6310 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6311 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6312 for (JCTree t : it.getBounds()) {
6313 validateAnnotatedType(t, t.type);
6314 }
6315 repeat = false;
6316 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6317 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6318 repeat = false;
6319 } else {
6320 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6321 " within: "+ errtree + " with kind: " + errtree.getKind());
6322 }
6323 }
6324 }
6325
6326 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6327 Symbol sym) {
6328 // Ensure that no declaration annotations are present.
6329 // Note that a tree type might be an AnnotatedType with
6330 // empty annotations, if only declaration annotations were given.
6331 // This method will raise an error for such a type.
6332 for (JCAnnotation ai : annotations) {
6333 if (!ai.type.isErroneous() &&
6334 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6335 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6336 }
6337 }
6338 }
6339 }
6340
6341 // <editor-fold desc="post-attribution visitor">
6342
6343 /**
6344 * Handle missing types/symbols in an AST. This routine is useful when
6345 * the compiler has encountered some errors (which might have ended up
6346 * terminating attribution abruptly); if the compiler is used in fail-over
6347 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6348 * prevents NPE to be propagated during subsequent compilation steps.
6349 */
6350 public void postAttr(JCTree tree) {
6351 new PostAttrAnalyzer().scan(tree);
6352 }
6353
6354 class PostAttrAnalyzer extends TreeScanner {
6355
6356 private void initTypeIfNeeded(JCTree that) {
6357 if (that.type == null) {
6358 if (that.hasTag(METHODDEF)) {
6359 that.type = dummyMethodType((JCMethodDecl)that);
6360 } else {
6361 that.type = syms.unknownType;
6362 }
6363 }
6364 }
6365
6366 /* Construct a dummy method type. If we have a method declaration,
6367 * and the declared return type is void, then use that return type
6368 * instead of UNKNOWN to avoid spurious error messages in lambda
6369 * bodies (see:JDK-8041704).
6370 */
6371 private Type dummyMethodType(JCMethodDecl md) {
6372 Type restype = syms.unknownType;
6373 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6374 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6375 if (prim.typetag == VOID)
6376 restype = syms.voidType;
6377 }
6378 return new MethodType(List.nil(), restype,
6379 List.nil(), syms.methodClass);
6380 }
6381 private Type dummyMethodType() {
6382 return dummyMethodType(null);
6383 }
6384
6385 @Override
6386 public void scan(JCTree tree) {
6387 if (tree == null) return;
6388 if (tree instanceof JCExpression) {
6389 initTypeIfNeeded(tree);
6390 }
6391 super.scan(tree);
6392 }
6393
6394 @Override
6395 public void visitIdent(JCIdent that) {
6396 if (that.sym == null) {
6397 that.sym = syms.unknownSymbol;
6398 }
6399 }
6400
6401 @Override
6402 public void visitSelect(JCFieldAccess that) {
6403 if (that.sym == null) {
6404 that.sym = syms.unknownSymbol;
6405 }
6406 super.visitSelect(that);
6407 }
6408
6409 @Override
6410 public void visitClassDef(JCClassDecl that) {
6411 initTypeIfNeeded(that);
6412 if (that.sym == null) {
6413 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6414 }
6415 super.visitClassDef(that);
6416 }
6417
6418 @Override
6419 public void visitMethodDef(JCMethodDecl that) {
6420 initTypeIfNeeded(that);
6421 if (that.sym == null) {
6422 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6423 }
6424 super.visitMethodDef(that);
6425 }
6426
6427 @Override
6428 public void visitVarDef(JCVariableDecl that) {
6429 initTypeIfNeeded(that);
6430 if (that.sym == null) {
6431 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6432 that.sym.adr = 0;
6433 }
6434 if (that.vartype == null) {
6435 that.vartype = make.at(Position.NOPOS).Erroneous();
6436 }
6437 super.visitVarDef(that);
6438 }
6439
6440 @Override
6441 public void visitBindingPattern(JCBindingPattern that) {
6442 initTypeIfNeeded(that);
6443 initTypeIfNeeded(that.var);
6444 if (that.var.sym == null) {
6445 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6446 that.var.sym.adr = 0;
6447 }
6448 super.visitBindingPattern(that);
6449 }
6450
6451 @Override
6452 public void visitRecordPattern(JCRecordPattern that) {
6453 initTypeIfNeeded(that);
6454 if (that.record == null) {
6455 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6456 that.type, syms.noSymbol);
6457 }
6458 if (that.fullComponentTypes == null) {
6459 that.fullComponentTypes = List.nil();
6460 }
6461 super.visitRecordPattern(that);
6462 }
6463
6464 @Override
6465 public void visitNewClass(JCNewClass that) {
6466 if (that.constructor == null) {
6467 that.constructor = new MethodSymbol(0, names.init,
6468 dummyMethodType(), syms.noSymbol);
6469 }
6470 if (that.constructorType == null) {
6471 that.constructorType = syms.unknownType;
6472 }
6473 super.visitNewClass(that);
6474 }
6475
6476 @Override
6477 public void visitAssignop(JCAssignOp that) {
6478 if (that.operator == null) {
6479 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6480 -1, syms.noSymbol);
6481 }
6482 super.visitAssignop(that);
6483 }
6484
6485 @Override
6486 public void visitBinary(JCBinary that) {
6487 if (that.operator == null) {
6488 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6489 -1, syms.noSymbol);
6490 }
6491 super.visitBinary(that);
6492 }
6493
6494 @Override
6495 public void visitUnary(JCUnary that) {
6496 if (that.operator == null) {
6497 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6498 -1, syms.noSymbol);
6499 }
6500 super.visitUnary(that);
6501 }
6502
6503 @Override
6504 public void visitReference(JCMemberReference that) {
6505 super.visitReference(that);
6506 if (that.sym == null) {
6507 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6508 syms.noSymbol);
6509 }
6510 }
6511 }
6512 // </editor-fold>
6513
6514 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6515 new TreeScanner() {
6516 Symbol packge = pkg;
6517 @Override
6518 public void visitIdent(JCIdent that) {
6519 that.sym = packge;
6520 }
6521
6522 @Override
6523 public void visitSelect(JCFieldAccess that) {
6524 that.sym = packge;
6525 packge = packge.owner;
6526 super.visitSelect(that);
6527 }
6528 }.scan(pid);
6529 }
6530
6531 }
--- EOF ---