1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
62 import com.sun.tools.javac.tree.*;
63 import com.sun.tools.javac.tree.JCTree.*;
64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
65 import com.sun.tools.javac.util.*;
66 import com.sun.tools.javac.util.DefinedBy.Api;
67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
68 import com.sun.tools.javac.util.JCDiagnostic.Error;
69 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
70 import com.sun.tools.javac.util.JCDiagnostic.Warning;
71 import com.sun.tools.javac.util.List;
72
73 import static com.sun.tools.javac.code.Flags.*;
74 import static com.sun.tools.javac.code.Flags.ANNOTATION;
75 import static com.sun.tools.javac.code.Flags.BLOCK;
76 import static com.sun.tools.javac.code.Kinds.*;
77 import static com.sun.tools.javac.code.Kinds.Kind.*;
78 import static com.sun.tools.javac.code.TypeTag.*;
79 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
80 import static com.sun.tools.javac.tree.JCTree.Tag.*;
81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
82
83 /** This is the main context-dependent analysis phase in GJC. It
84 * encompasses name resolution, type checking and constant folding as
85 * subtasks. Some subtasks involve auxiliary classes.
86 * @see Check
87 * @see Resolve
88 * @see ConstFold
89 * @see Infer
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public class Attr extends JCTree.Visitor {
97 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
98
99 final Names names;
100 final Log log;
101 final Symtab syms;
102 final Resolve rs;
103 final Operators operators;
104 final Infer infer;
105 final Analyzer analyzer;
106 final DeferredAttr deferredAttr;
107 final Check chk;
108 final Flow flow;
109 final MemberEnter memberEnter;
110 final TypeEnter typeEnter;
111 final TreeMaker make;
112 final ConstFold cfolder;
113 final Enter enter;
114 final Target target;
115 final Types types;
116 final Preview preview;
117 final JCDiagnostic.Factory diags;
118 final TypeAnnotations typeAnnotations;
119 final DeferredLintHandler deferredLintHandler;
120 final TypeEnvs typeEnvs;
121 final Dependencies dependencies;
122 final Annotate annotate;
123 final ArgumentAttr argumentAttr;
124 final MatchBindingsComputer matchBindingsComputer;
125 final AttrRecover attrRecover;
126
127 public static Attr instance(Context context) {
128 Attr instance = context.get(attrKey);
129 if (instance == null)
130 instance = new Attr(context);
131 return instance;
132 }
133
134 @SuppressWarnings("this-escape")
135 protected Attr(Context context) {
136 context.put(attrKey, this);
137
138 names = Names.instance(context);
139 log = Log.instance(context);
140 syms = Symtab.instance(context);
141 rs = Resolve.instance(context);
142 operators = Operators.instance(context);
143 chk = Check.instance(context);
144 flow = Flow.instance(context);
145 memberEnter = MemberEnter.instance(context);
146 typeEnter = TypeEnter.instance(context);
147 make = TreeMaker.instance(context);
148 enter = Enter.instance(context);
149 infer = Infer.instance(context);
150 analyzer = Analyzer.instance(context);
151 deferredAttr = DeferredAttr.instance(context);
152 cfolder = ConstFold.instance(context);
153 target = Target.instance(context);
154 types = Types.instance(context);
155 preview = Preview.instance(context);
156 diags = JCDiagnostic.Factory.instance(context);
157 annotate = Annotate.instance(context);
158 typeAnnotations = TypeAnnotations.instance(context);
159 deferredLintHandler = DeferredLintHandler.instance(context);
160 typeEnvs = TypeEnvs.instance(context);
161 dependencies = Dependencies.instance(context);
162 argumentAttr = ArgumentAttr.instance(context);
163 matchBindingsComputer = MatchBindingsComputer.instance(context);
164 attrRecover = AttrRecover.instance(context);
165
166 Options options = Options.instance(context);
167
168 Source source = Source.instance(context);
169 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
170 allowRecords = Feature.RECORDS.allowedInSource(source);
171 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
172 Feature.PATTERN_SWITCH.allowedInSource(source);
173 allowUnconditionalPatternsInstanceOf =
174 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
175 sourceName = source.name;
176 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
177
178 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
179 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
180 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
181 methodAttrInfo = new MethodAttrInfo();
182 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
183 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
184 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
185 }
186
187 /** Switch: reifiable types in instanceof enabled?
188 */
189 boolean allowReifiableTypesInInstanceof;
190
191 /** Are records allowed
192 */
193 private final boolean allowRecords;
194
195 /** Are patterns in switch allowed
196 */
197 private final boolean allowPatternSwitch;
198
199 /** Are unconditional patterns in instanceof allowed
200 */
201 private final boolean allowUnconditionalPatternsInstanceOf;
202
203 /**
204 * Switch: warn about use of variable before declaration?
205 * RFE: 6425594
206 */
207 boolean useBeforeDeclarationWarning;
208
209 /**
210 * Switch: name of source level; used for error reporting.
211 */
212 String sourceName;
213
214 /** Check kind and type of given tree against protokind and prototype.
215 * If check succeeds, store type in tree and return it.
216 * If check fails, store errType in tree and return it.
217 * No checks are performed if the prototype is a method type.
218 * It is not necessary in this case since we know that kind and type
219 * are correct.
220 *
221 * @param tree The tree whose kind and type is checked
222 * @param found The computed type of the tree
223 * @param ownkind The computed kind of the tree
224 * @param resultInfo The expected result of the tree
225 */
226 Type check(final JCTree tree,
227 final Type found,
228 final KindSelector ownkind,
229 final ResultInfo resultInfo) {
230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
231 Type owntype;
232 boolean shouldCheck = !found.hasTag(ERROR) &&
233 !resultInfo.pt.hasTag(METHOD) &&
234 !resultInfo.pt.hasTag(FORALL);
235 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
236 log.error(tree.pos(),
237 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
238 ownkind.kindNames()));
239 owntype = types.createErrorType(found);
240 } else if (inferenceContext.free(found)) {
241 //delay the check if there are inference variables in the found type
242 //this means we are dealing with a partially inferred poly expression
243 owntype = shouldCheck ? resultInfo.pt : found;
244 if (resultInfo.checkMode.installPostInferenceHook()) {
245 inferenceContext.addFreeTypeListener(List.of(found),
246 instantiatedContext -> {
247 ResultInfo pendingResult =
248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
250 });
251 }
252 } else {
253 owntype = shouldCheck ?
254 resultInfo.check(tree, found) :
255 found;
256 }
257 if (resultInfo.checkMode.updateTreeType()) {
258 tree.type = owntype;
259 }
260 return owntype;
261 }
262
263 /** Is given blank final variable assignable, i.e. in a scope where it
264 * may be assigned to even though it is final?
265 * @param v The blank final variable.
266 * @param env The current environment.
267 */
268 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
269 Symbol owner = env.info.scope.owner;
270 // owner refers to the innermost variable, method or
271 // initializer block declaration at this point.
272 boolean isAssignable =
273 v.owner == owner
274 ||
275 ((owner.name == names.init || // i.e. we are in a constructor
276 owner.kind == VAR || // i.e. we are in a variable initializer
277 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
278 &&
279 v.owner == owner.owner
280 &&
281 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
282 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
283 return isAssignable & !insideCompactConstructor;
284 }
285
286 /** Check that variable can be assigned to.
287 * @param pos The current source code position.
288 * @param v The assigned variable
289 * @param base If the variable is referred to in a Select, the part
290 * to the left of the `.', null otherwise.
291 * @param env The current environment.
292 */
293 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
294 if (v.name == names._this) {
295 log.error(pos, Errors.CantAssignValToThis);
296 } else if ((v.flags() & FINAL) != 0 &&
297 ((v.flags() & HASINIT) != 0
298 ||
299 !((base == null ||
300 TreeInfo.isThisQualifier(base)) &&
301 isAssignableAsBlankFinal(v, env)))) {
302 if (v.isResourceVariable()) { //TWR resource
303 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
304 } else {
305 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
306 }
307 }
308
309 if (!env.info.ctorPrologue &&
310 v.owner.isValueClass() &&
311 !env.info.instanceInitializerBlock && // it is OK instance initializer blocks will go after super() anyways
312 v.owner.kind == TYP &&
313 v.owner == env.enclClass.sym &&
314 (v.flags() & STATIC) == 0 &&
315 (base == null ||
316 TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, base))) {
317 log.error(pos, Errors.CantRefAfterCtorCalled(v));
318 }
319 }
320
321 /** Does tree represent a static reference to an identifier?
322 * It is assumed that tree is either a SELECT or an IDENT.
323 * We have to weed out selects from non-type names here.
324 * @param tree The candidate tree.
325 */
326 boolean isStaticReference(JCTree tree) {
327 if (tree.hasTag(SELECT)) {
328 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
329 if (lsym == null || lsym.kind != TYP) {
330 return false;
331 }
332 }
333 return true;
334 }
335
336 /** Is this symbol a type?
337 */
338 static boolean isType(Symbol sym) {
339 return sym != null && sym.kind == TYP;
340 }
341
342 /** The current `this' symbol.
343 * @param env The current environment.
344 */
345 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
346 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
347 }
348
349 /** Attribute a parsed identifier.
350 * @param tree Parsed identifier name
351 * @param topLevel The toplevel to use
352 */
353 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
354 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
355 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
356 syms.errSymbol.name,
357 null, null, null, null);
358 localEnv.enclClass.sym = syms.errSymbol;
359 return attribIdent(tree, localEnv);
360 }
361
362 /** Attribute a parsed identifier.
363 * @param tree Parsed identifier name
364 * @param env The env to use
365 */
366 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
367 return tree.accept(identAttributer, env);
368 }
369 // where
370 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
371 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
372 @Override @DefinedBy(Api.COMPILER_TREE)
373 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
374 Symbol site = visit(node.getExpression(), env);
375 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
376 return site;
377 Name name = (Name)node.getIdentifier();
378 if (site.kind == PCK) {
379 env.toplevel.packge = (PackageSymbol)site;
380 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
381 KindSelector.TYP_PCK);
382 } else {
383 env.enclClass.sym = (ClassSymbol)site;
384 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
385 }
386 }
387
388 @Override @DefinedBy(Api.COMPILER_TREE)
389 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
390 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
391 }
392 }
393
394 public Type coerce(Type etype, Type ttype) {
395 return cfolder.coerce(etype, ttype);
396 }
397
398 public Type attribType(JCTree node, TypeSymbol sym) {
399 Env<AttrContext> env = typeEnvs.get(sym);
400 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
401 return attribTree(node, localEnv, unknownTypeInfo);
402 }
403
404 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
405 // Attribute qualifying package or class.
406 JCFieldAccess s = tree.qualid;
407 return attribTree(s.selected, env,
408 new ResultInfo(tree.staticImport ?
409 KindSelector.TYP : KindSelector.TYP_PCK,
410 Type.noType));
411 }
412
413 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
414 return attribToTree(expr, env, tree, unknownExprInfo);
415 }
416
417 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
418 return attribToTree(stmt, env, tree, statInfo);
419 }
420
421 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
422 breakTree = tree;
423 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
424 try {
425 deferredAttr.attribSpeculative(root, env, resultInfo,
426 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
427 argumentAttr.withLocalCacheContext());
428 attrRecover.doRecovery();
429 } catch (BreakAttr b) {
430 return b.env;
431 } catch (AssertionError ae) {
432 if (ae.getCause() instanceof BreakAttr breakAttr) {
433 return breakAttr.env;
434 } else {
435 throw ae;
436 }
437 } finally {
438 breakTree = null;
439 log.useSource(prev);
440 }
441 return env;
442 }
443
444 private JCTree breakTree = null;
445
446 private static class BreakAttr extends RuntimeException {
447 static final long serialVersionUID = -6924771130405446405L;
448 private transient Env<AttrContext> env;
449 private BreakAttr(Env<AttrContext> env) {
450 this.env = env;
451 }
452 }
453
454 /**
455 * Mode controlling behavior of Attr.Check
456 */
457 enum CheckMode {
458
459 NORMAL,
460
461 /**
462 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
463 * that the captured var cache in {@code InferenceContext} will be used in read-only
464 * mode when performing inference checks.
465 */
466 NO_TREE_UPDATE {
467 @Override
468 public boolean updateTreeType() {
469 return false;
470 }
471 },
472 /**
473 * Mode signalling that caller will manage free types in tree decorations.
474 */
475 NO_INFERENCE_HOOK {
476 @Override
477 public boolean installPostInferenceHook() {
478 return false;
479 }
480 };
481
482 public boolean updateTreeType() {
483 return true;
484 }
485 public boolean installPostInferenceHook() {
486 return true;
487 }
488 }
489
490
491 class ResultInfo {
492 final KindSelector pkind;
493 final Type pt;
494 final CheckContext checkContext;
495 final CheckMode checkMode;
496
497 ResultInfo(KindSelector pkind, Type pt) {
498 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
499 }
500
501 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
502 this(pkind, pt, chk.basicHandler, checkMode);
503 }
504
505 protected ResultInfo(KindSelector pkind,
506 Type pt, CheckContext checkContext) {
507 this(pkind, pt, checkContext, CheckMode.NORMAL);
508 }
509
510 protected ResultInfo(KindSelector pkind,
511 Type pt, CheckContext checkContext, CheckMode checkMode) {
512 this.pkind = pkind;
513 this.pt = pt;
514 this.checkContext = checkContext;
515 this.checkMode = checkMode;
516 }
517
518 /**
519 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
520 * @param tree The tree to be type-checked.
521 * @return true if {@code ArgumentAttr} should be used.
522 */
523 protected boolean needsArgumentAttr(JCTree tree) { return false; }
524
525 protected Type check(final DiagnosticPosition pos, final Type found) {
526 return chk.checkType(pos, found, pt, checkContext);
527 }
528
529 protected ResultInfo dup(Type newPt) {
530 return new ResultInfo(pkind, newPt, checkContext, checkMode);
531 }
532
533 protected ResultInfo dup(CheckContext newContext) {
534 return new ResultInfo(pkind, pt, newContext, checkMode);
535 }
536
537 protected ResultInfo dup(Type newPt, CheckContext newContext) {
538 return new ResultInfo(pkind, newPt, newContext, checkMode);
539 }
540
541 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
542 return new ResultInfo(pkind, newPt, newContext, newMode);
543 }
544
545 protected ResultInfo dup(CheckMode newMode) {
546 return new ResultInfo(pkind, pt, checkContext, newMode);
547 }
548
549 @Override
550 public String toString() {
551 if (pt != null) {
552 return pt.toString();
553 } else {
554 return "";
555 }
556 }
557 }
558
559 class MethodAttrInfo extends ResultInfo {
560 public MethodAttrInfo() {
561 this(chk.basicHandler);
562 }
563
564 public MethodAttrInfo(CheckContext checkContext) {
565 super(KindSelector.VAL, Infer.anyPoly, checkContext);
566 }
567
568 @Override
569 protected boolean needsArgumentAttr(JCTree tree) {
570 return true;
571 }
572
573 protected ResultInfo dup(Type newPt) {
574 throw new IllegalStateException();
575 }
576
577 protected ResultInfo dup(CheckContext newContext) {
578 return new MethodAttrInfo(newContext);
579 }
580
581 protected ResultInfo dup(Type newPt, CheckContext newContext) {
582 throw new IllegalStateException();
583 }
584
585 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
586 throw new IllegalStateException();
587 }
588
589 protected ResultInfo dup(CheckMode newMode) {
590 throw new IllegalStateException();
591 }
592 }
593
594 class RecoveryInfo extends ResultInfo {
595
596 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
597 this(deferredAttrContext, Type.recoveryType);
598 }
599
600 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
601 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
602 @Override
603 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
604 return deferredAttrContext;
605 }
606 @Override
607 public boolean compatible(Type found, Type req, Warner warn) {
608 return true;
609 }
610 @Override
611 public void report(DiagnosticPosition pos, JCDiagnostic details) {
612 boolean needsReport = pt == Type.recoveryType ||
613 (details.getDiagnosticPosition() != null &&
614 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
615 if (needsReport) {
616 chk.basicHandler.report(pos, details);
617 }
618 }
619 });
620 }
621 }
622
623 final ResultInfo statInfo;
624 final ResultInfo varAssignmentInfo;
625 final ResultInfo methodAttrInfo;
626 final ResultInfo unknownExprInfo;
627 final ResultInfo unknownTypeInfo;
628 final ResultInfo unknownTypeExprInfo;
629 final ResultInfo recoveryInfo;
630
631 Type pt() {
632 return resultInfo.pt;
633 }
634
635 KindSelector pkind() {
636 return resultInfo.pkind;
637 }
638
639 /* ************************************************************************
640 * Visitor methods
641 *************************************************************************/
642
643 /** Visitor argument: the current environment.
644 */
645 Env<AttrContext> env;
646
647 /** Visitor argument: the currently expected attribution result.
648 */
649 ResultInfo resultInfo;
650
651 /** Visitor result: the computed type.
652 */
653 Type result;
654
655 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
656
657 /** Visitor method: attribute a tree, catching any completion failure
658 * exceptions. Return the tree's type.
659 *
660 * @param tree The tree to be visited.
661 * @param env The environment visitor argument.
662 * @param resultInfo The result info visitor argument.
663 */
664 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
665 Env<AttrContext> prevEnv = this.env;
666 ResultInfo prevResult = this.resultInfo;
667 try {
668 this.env = env;
669 this.resultInfo = resultInfo;
670 if (resultInfo.needsArgumentAttr(tree)) {
671 result = argumentAttr.attribArg(tree, env);
672 } else {
673 tree.accept(this);
674 }
675 matchBindings = matchBindingsComputer.finishBindings(tree,
676 matchBindings);
677 if (tree == breakTree &&
678 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
679 breakTreeFound(copyEnv(env));
680 }
681 return result;
682 } catch (CompletionFailure ex) {
683 tree.type = syms.errType;
684 return chk.completionError(tree.pos(), ex);
685 } finally {
686 this.env = prevEnv;
687 this.resultInfo = prevResult;
688 }
689 }
690
691 protected void breakTreeFound(Env<AttrContext> env) {
692 throw new BreakAttr(env);
693 }
694
695 Env<AttrContext> copyEnv(Env<AttrContext> env) {
696 Env<AttrContext> newEnv =
697 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
698 if (newEnv.outer != null) {
699 newEnv.outer = copyEnv(newEnv.outer);
700 }
701 return newEnv;
702 }
703
704 WriteableScope copyScope(WriteableScope sc) {
705 WriteableScope newScope = WriteableScope.create(sc.owner);
706 List<Symbol> elemsList = List.nil();
707 for (Symbol sym : sc.getSymbols()) {
708 elemsList = elemsList.prepend(sym);
709 }
710 for (Symbol s : elemsList) {
711 newScope.enter(s);
712 }
713 return newScope;
714 }
715
716 /** Derived visitor method: attribute an expression tree.
717 */
718 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
719 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
720 }
721
722 /** Derived visitor method: attribute an expression tree with
723 * no constraints on the computed type.
724 */
725 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
726 return attribTree(tree, env, unknownExprInfo);
727 }
728
729 /** Derived visitor method: attribute a type tree.
730 */
731 public Type attribType(JCTree tree, Env<AttrContext> env) {
732 Type result = attribType(tree, env, Type.noType);
733 return result;
734 }
735
736 /** Derived visitor method: attribute a type tree.
737 */
738 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
739 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
740 return result;
741 }
742
743 /** Derived visitor method: attribute a statement or definition tree.
744 */
745 public Type attribStat(JCTree tree, Env<AttrContext> env) {
746 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
747 Type result = attribTree(tree, env, statInfo);
748 analyzer.analyzeIfNeeded(tree, analyzeEnv);
749 attrRecover.doRecovery();
750 return result;
751 }
752
753 /** Attribute a list of expressions, returning a list of types.
754 */
755 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
756 ListBuffer<Type> ts = new ListBuffer<>();
757 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
758 ts.append(attribExpr(l.head, env, pt));
759 return ts.toList();
760 }
761
762 /** Attribute a list of statements, returning nothing.
763 */
764 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
765 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
766 attribStat(l.head, env);
767 }
768
769 /** Attribute the arguments in a method call, returning the method kind.
770 */
771 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
772 KindSelector kind = initialKind;
773 for (JCExpression arg : trees) {
774 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
775 if (argtype.hasTag(DEFERRED)) {
776 kind = KindSelector.of(KindSelector.POLY, kind);
777 }
778 argtypes.append(argtype);
779 }
780 return kind;
781 }
782
783 /** Attribute a type argument list, returning a list of types.
784 * Caller is responsible for calling checkRefTypes.
785 */
786 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
787 ListBuffer<Type> argtypes = new ListBuffer<>();
788 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
789 argtypes.append(attribType(l.head, env));
790 return argtypes.toList();
791 }
792
793 /** Attribute a type argument list, returning a list of types.
794 * Check that all the types are references.
795 */
796 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
797 List<Type> types = attribAnyTypes(trees, env);
798 return chk.checkRefTypes(trees, types);
799 }
800
801 /**
802 * Attribute type variables (of generic classes or methods).
803 * Compound types are attributed later in attribBounds.
804 * @param typarams the type variables to enter
805 * @param env the current environment
806 */
807 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
808 for (JCTypeParameter tvar : typarams) {
809 TypeVar a = (TypeVar)tvar.type;
810 a.tsym.flags_field |= UNATTRIBUTED;
811 a.setUpperBound(Type.noType);
812 if (!tvar.bounds.isEmpty()) {
813 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
814 for (JCExpression bound : tvar.bounds.tail)
815 bounds = bounds.prepend(attribType(bound, env));
816 types.setBounds(a, bounds.reverse());
817 } else {
818 // if no bounds are given, assume a single bound of
819 // java.lang.Object.
820 types.setBounds(a, List.of(syms.objectType));
821 }
822 a.tsym.flags_field &= ~UNATTRIBUTED;
823 }
824 if (checkCyclic) {
825 for (JCTypeParameter tvar : typarams) {
826 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
827 }
828 }
829 }
830
831 /**
832 * Attribute the type references in a list of annotations.
833 */
834 void attribAnnotationTypes(List<JCAnnotation> annotations,
835 Env<AttrContext> env) {
836 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
837 JCAnnotation a = al.head;
838 attribType(a.annotationType, env);
839 }
840 }
841
842 /**
843 * Attribute a "lazy constant value".
844 * @param env The env for the const value
845 * @param variable The initializer for the const value
846 * @param type The expected type, or null
847 * @see VarSymbol#setLazyConstValue
848 */
849 public Object attribLazyConstantValue(Env<AttrContext> env,
850 JCVariableDecl variable,
851 Type type) {
852
853 DiagnosticPosition prevLintPos
854 = deferredLintHandler.setPos(variable.pos());
855
856 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
857 try {
858 Type itype = attribExpr(variable.init, env, type);
859 if (variable.isImplicitlyTyped()) {
860 //fixup local variable type
861 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
862 }
863 if (itype.constValue() != null) {
864 return coerce(itype, type).constValue();
865 } else {
866 return null;
867 }
868 } finally {
869 log.useSource(prevSource);
870 deferredLintHandler.setPos(prevLintPos);
871 }
872 }
873
874 /** Attribute type reference in an `extends' or `implements' clause.
875 * Supertypes of anonymous inner classes are usually already attributed.
876 *
877 * @param tree The tree making up the type reference.
878 * @param env The environment current at the reference.
879 * @param classExpected true if only a class is expected here.
880 * @param interfaceExpected true if only an interface is expected here.
881 */
882 Type attribBase(JCTree tree,
883 Env<AttrContext> env,
884 boolean classExpected,
885 boolean interfaceExpected,
886 boolean checkExtensible) {
887 Type t = tree.type != null ?
888 tree.type :
889 attribType(tree, env);
890 try {
891 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
892 } catch (CompletionFailure ex) {
893 chk.completionError(tree.pos(), ex);
894 return t;
895 }
896 }
897 Type checkBase(Type t,
898 JCTree tree,
899 Env<AttrContext> env,
900 boolean classExpected,
901 boolean interfaceExpected,
902 boolean checkExtensible) {
903 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
904 (((JCTypeApply) tree).clazz).pos() : tree.pos();
905 if (t.tsym.isAnonymous()) {
906 log.error(pos, Errors.CantInheritFromAnon);
907 return types.createErrorType(t);
908 }
909 if (t.isErroneous())
910 return t;
911 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
912 // check that type variable is already visible
913 if (t.getUpperBound() == null) {
914 log.error(pos, Errors.IllegalForwardRef);
915 return types.createErrorType(t);
916 }
917 } else {
918 t = chk.checkClassType(pos, t, checkExtensible);
919 }
920 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
921 log.error(pos, Errors.IntfExpectedHere);
922 // return errType is necessary since otherwise there might
923 // be undetected cycles which cause attribution to loop
924 return types.createErrorType(t);
925 } else if (checkExtensible &&
926 classExpected &&
927 (t.tsym.flags() & INTERFACE) != 0) {
928 log.error(pos, Errors.NoIntfExpectedHere);
929 return types.createErrorType(t);
930 }
931 if (checkExtensible &&
932 ((t.tsym.flags() & FINAL) != 0)) {
933 log.error(pos,
934 Errors.CantInheritFromFinal(t.tsym));
935 }
936 chk.checkNonCyclic(pos, t);
937 return t;
938 }
939
940 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
941 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
942 id.type = env.info.scope.owner.enclClass().type;
943 id.sym = env.info.scope.owner.enclClass();
944 return id.type;
945 }
946
947 public void visitClassDef(JCClassDecl tree) {
948 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
949 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
950 argumentAttr.withLocalCacheContext() : null);
951 boolean ctorProloguePrev = env.info.ctorPrologue;
952 env.info.ctorPrologue = false;
953 try {
954 // Local and anonymous classes have not been entered yet, so we need to
955 // do it now.
956 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
957 enter.classEnter(tree, env);
958 } else {
959 // If this class declaration is part of a class level annotation,
960 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
961 // order to simplify later steps and allow for sensible error
962 // messages.
963 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
964 enter.classEnter(tree, env);
965 }
966
967 ClassSymbol c = tree.sym;
968 if (c == null) {
969 // exit in case something drastic went wrong during enter.
970 result = null;
971 } else {
972 // make sure class has been completed:
973 c.complete();
974
975 // If this class appears as an anonymous class in a constructor
976 // prologue, disable implicit outer instance from being passed.
977 // (This would be an illegal access to "this before super").
978 if (ctorProloguePrev && env.tree.hasTag(NEWCLASS)) {
979 c.flags_field |= NOOUTERTHIS;
980 }
981 attribClass(tree.pos(), c);
982 result = tree.type = c.type;
983 }
984 } finally {
985 localCacheContext.ifPresent(LocalCacheContext::leave);
986 env.info.ctorPrologue = ctorProloguePrev;
987 }
988 }
989
990 public void visitMethodDef(JCMethodDecl tree) {
991 MethodSymbol m = tree.sym;
992 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
993
994 Lint lint = env.info.lint.augment(m);
995 Lint prevLint = chk.setLint(lint);
996 boolean ctorProloguePrev = env.info.ctorPrologue;
997 env.info.ctorPrologue = false;
998 MethodSymbol prevMethod = chk.setMethod(m);
999 try {
1000 deferredLintHandler.flush(tree.pos());
1001 chk.checkDeprecatedAnnotation(tree.pos(), m);
1002
1003
1004 // Create a new environment with local scope
1005 // for attributing the method.
1006 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1007 localEnv.info.lint = lint;
1008
1009 attribStats(tree.typarams, localEnv);
1010
1011 // If we override any other methods, check that we do so properly.
1012 // JLS ???
1013 if (m.isStatic()) {
1014 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1015 } else {
1016 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1017 }
1018 chk.checkOverride(env, tree, m);
1019
1020 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1021 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1022 }
1023
1024 // Enter all type parameters into the local method scope.
1025 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1026 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1027
1028 ClassSymbol owner = env.enclClass.sym;
1029 if ((owner.flags() & ANNOTATION) != 0 &&
1030 (tree.params.nonEmpty() ||
1031 tree.recvparam != null))
1032 log.error(tree.params.nonEmpty() ?
1033 tree.params.head.pos() :
1034 tree.recvparam.pos(),
1035 Errors.IntfAnnotationMembersCantHaveParams);
1036
1037 // Attribute all value parameters.
1038 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1039 attribStat(l.head, localEnv);
1040 }
1041
1042 chk.checkVarargsMethodDecl(localEnv, tree);
1043
1044 // Check that type parameters are well-formed.
1045 chk.validate(tree.typarams, localEnv);
1046
1047 // Check that result type is well-formed.
1048 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1049 chk.validate(tree.restype, localEnv);
1050
1051 // Check that receiver type is well-formed.
1052 if (tree.recvparam != null) {
1053 // Use a new environment to check the receiver parameter.
1054 // Otherwise I get "might not have been initialized" errors.
1055 // Is there a better way?
1056 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1057 attribType(tree.recvparam, newEnv);
1058 chk.validate(tree.recvparam, newEnv);
1059 }
1060
1061 // Is this method a constructor?
1062 boolean isConstructor = TreeInfo.isConstructor(tree);
1063
1064 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1065 // lets find if this method is an accessor
1066 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1067 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1068 if (recordComponent.isPresent()) {
1069 // the method is a user defined accessor lets check that everything is fine
1070 if (!tree.sym.isPublic()) {
1071 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1072 }
1073 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1074 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1075 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1076 }
1077 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1078 log.error(tree,
1079 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1080 }
1081 if (!tree.typarams.isEmpty()) {
1082 log.error(tree,
1083 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1084 }
1085 if (tree.sym.isStatic()) {
1086 log.error(tree,
1087 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1088 }
1089 }
1090
1091 if (isConstructor) {
1092 // if this a constructor other than the canonical one
1093 if ((tree.sym.flags_field & RECORD) == 0) {
1094 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1095 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1096 }
1097 } else {
1098 // but if it is the canonical:
1099
1100 /* if user generated, then it shouldn't:
1101 * - have an accessibility stricter than that of the record type
1102 * - explicitly invoke any other constructor
1103 */
1104 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1105 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1106 log.error(tree,
1107 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1108 Errors.InvalidCanonicalConstructorInRecord(
1109 Fragments.Canonical,
1110 env.enclClass.sym.name,
1111 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1112 ) :
1113 Errors.InvalidCanonicalConstructorInRecord(
1114 Fragments.Canonical,
1115 env.enclClass.sym.name,
1116 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1117 )
1118 );
1119 }
1120
1121 if (TreeInfo.hasAnyConstructorCall(tree)) {
1122 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1123 Fragments.Canonical, env.enclClass.sym.name,
1124 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1125 }
1126 }
1127
1128 // also we want to check that no type variables have been defined
1129 if (!tree.typarams.isEmpty()) {
1130 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1131 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1132 }
1133
1134 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1135 * record components
1136 */
1137 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1138 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1139 for (JCVariableDecl param: tree.params) {
1140 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1141 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1142 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1143 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1144 Fragments.Canonical, env.enclClass.sym.name,
1145 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1146 }
1147 recordComponents = recordComponents.tail;
1148 recordFieldTypes = recordFieldTypes.tail;
1149 }
1150 }
1151 }
1152 }
1153
1154 // annotation method checks
1155 if ((owner.flags() & ANNOTATION) != 0) {
1156 // annotation method cannot have throws clause
1157 if (tree.thrown.nonEmpty()) {
1158 log.error(tree.thrown.head.pos(),
1159 Errors.ThrowsNotAllowedInIntfAnnotation);
1160 }
1161 // annotation method cannot declare type-parameters
1162 if (tree.typarams.nonEmpty()) {
1163 log.error(tree.typarams.head.pos(),
1164 Errors.IntfAnnotationMembersCantHaveTypeParams);
1165 }
1166 // validate annotation method's return type (could be an annotation type)
1167 chk.validateAnnotationType(tree.restype);
1168 // ensure that annotation method does not clash with members of Object/Annotation
1169 chk.validateAnnotationMethod(tree.pos(), m);
1170 }
1171
1172 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1173 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1174
1175 if (tree.body == null) {
1176 // Empty bodies are only allowed for
1177 // abstract, native, or interface methods, or for methods
1178 // in a retrofit signature class.
1179 if (tree.defaultValue != null) {
1180 if ((owner.flags() & ANNOTATION) == 0)
1181 log.error(tree.pos(),
1182 Errors.DefaultAllowedInIntfAnnotationMember);
1183 }
1184 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1185 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1186 } else {
1187 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1188 if ((owner.flags() & INTERFACE) != 0) {
1189 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1190 } else {
1191 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1192 }
1193 } else if ((tree.mods.flags & NATIVE) != 0) {
1194 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1195 }
1196 // Add an implicit super() call unless an explicit call to
1197 // super(...) or this(...) is given
1198 // or we are compiling class java.lang.Object.
1199 if (isConstructor && owner.type != syms.objectType) {
1200 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1201 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1202 make.Ident(names._super), make.Idents(List.nil())));
1203 if (owner.isValueClass()) {
1204 tree.body.stats = tree.body.stats.append(supCall);
1205 } else {
1206 tree.body.stats = tree.body.stats.prepend(supCall);
1207 }
1208 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1209 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1210 TreeInfo.hasConstructorCall(tree, names._super)) {
1211 // enum constructors are not allowed to call super
1212 // directly, so make sure there aren't any super calls
1213 // in enum constructors, except in the compiler
1214 // generated one.
1215 log.error(tree.body.stats.head.pos(),
1216 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1217 }
1218 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1219 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1220 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1221 if (!initParamNames.equals(recordComponentNames)) {
1222 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1223 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1224 }
1225 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1226 log.error(tree,
1227 Errors.InvalidCanonicalConstructorInRecord(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1229 env.enclClass.sym.name,
1230 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1231 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1232 }
1233 }
1234 }
1235
1236 // Attribute all type annotations in the body
1237 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1238 annotate.flush();
1239
1240 // Start of constructor prologue
1241 localEnv.info.ctorPrologue = isConstructor;
1242
1243 // Attribute method body.
1244 attribStat(tree.body, localEnv);
1245 }
1246
1247 localEnv.info.scope.leave();
1248 result = tree.type = m.type;
1249 } finally {
1250 chk.setLint(prevLint);
1251 chk.setMethod(prevMethod);
1252 env.info.ctorPrologue = ctorProloguePrev;
1253 }
1254 }
1255
1256 public void visitVarDef(JCVariableDecl tree) {
1257 // Local variables have not been entered yet, so we need to do it now:
1258 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1259 if (tree.sym != null) {
1260 // parameters have already been entered
1261 env.info.scope.enter(tree.sym);
1262 } else {
1263 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1264 if (tree.init == null) {
1265 //cannot use 'var' without initializer
1266 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1267 tree.vartype = make.Erroneous();
1268 } else {
1269 Fragment msg = canInferLocalVarType(tree);
1270 if (msg != null) {
1271 //cannot use 'var' with initializer which require an explicit target
1272 //(e.g. lambda, method reference, array initializer).
1273 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1274 tree.vartype = make.Erroneous();
1275 }
1276 }
1277 }
1278 try {
1279 annotate.blockAnnotations();
1280 memberEnter.memberEnter(tree, env);
1281 } finally {
1282 annotate.unblockAnnotations();
1283 }
1284 }
1285 } else {
1286 if (tree.init != null) {
1287 // Field initializer expression need to be entered.
1288 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1289 annotate.flush();
1290 }
1291 }
1292
1293 VarSymbol v = tree.sym;
1294 Lint lint = env.info.lint.augment(v);
1295 Lint prevLint = chk.setLint(lint);
1296
1297 // Check that the variable's declared type is well-formed.
1298 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1299 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1300 (tree.sym.flags() & PARAMETER) != 0;
1301 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1302
1303 try {
1304 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1305 deferredLintHandler.flush(tree.pos());
1306 chk.checkDeprecatedAnnotation(tree.pos(), v);
1307
1308 if (tree.init != null) {
1309 if ((v.flags_field & FINAL) == 0 ||
1310 !memberEnter.needsLazyConstValue(tree.init)) {
1311 // Not a compile-time constant
1312 // Attribute initializer in a new environment
1313 // with the declared variable as owner.
1314 // Check that initializer conforms to variable's declared type.
1315 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1316 initEnv.info.lint = lint;
1317 // In order to catch self-references, we set the variable's
1318 // declaration position to maximal possible value, effectively
1319 // marking the variable as undefined.
1320 initEnv.info.enclVar = v;
1321 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1322 try {
1323 if (v.owner.kind == TYP && v.owner.isValueClass() && !v.isStatic()) {
1324 // strict instance initializer in a value class
1325 initEnv.info.ctorPrologue = true;
1326 }
1327 attribExpr(tree.init, initEnv, v.type);
1328 if (tree.isImplicitlyTyped()) {
1329 //fixup local variable type
1330 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1331 }
1332 } finally {
1333 initEnv.info.ctorPrologue = previousCtorPrologue;
1334 }
1335 }
1336 if (tree.isImplicitlyTyped()) {
1337 setSyntheticVariableType(tree, v.type);
1338 }
1339 }
1340 result = tree.type = v.type;
1341 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1342 if (isNonArgsMethodInObject(v.name)) {
1343 log.error(tree, Errors.IllegalRecordComponentName(v));
1344 }
1345 }
1346 }
1347 finally {
1348 chk.setLint(prevLint);
1349 }
1350 }
1351
1352 private boolean isNonArgsMethodInObject(Name name) {
1353 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1354 if (s.type.getParameterTypes().isEmpty()) {
1355 return true;
1356 }
1357 }
1358 return false;
1359 }
1360
1361 Fragment canInferLocalVarType(JCVariableDecl tree) {
1362 LocalInitScanner lis = new LocalInitScanner();
1363 lis.scan(tree.init);
1364 return lis.badInferenceMsg;
1365 }
1366
1367 static class LocalInitScanner extends TreeScanner {
1368 Fragment badInferenceMsg = null;
1369 boolean needsTarget = true;
1370
1371 @Override
1372 public void visitNewArray(JCNewArray tree) {
1373 if (tree.elemtype == null && needsTarget) {
1374 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1375 }
1376 }
1377
1378 @Override
1379 public void visitLambda(JCLambda tree) {
1380 if (needsTarget) {
1381 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1382 }
1383 }
1384
1385 @Override
1386 public void visitTypeCast(JCTypeCast tree) {
1387 boolean prevNeedsTarget = needsTarget;
1388 try {
1389 needsTarget = false;
1390 super.visitTypeCast(tree);
1391 } finally {
1392 needsTarget = prevNeedsTarget;
1393 }
1394 }
1395
1396 @Override
1397 public void visitReference(JCMemberReference tree) {
1398 if (needsTarget) {
1399 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1400 }
1401 }
1402
1403 @Override
1404 public void visitNewClass(JCNewClass tree) {
1405 boolean prevNeedsTarget = needsTarget;
1406 try {
1407 needsTarget = false;
1408 super.visitNewClass(tree);
1409 } finally {
1410 needsTarget = prevNeedsTarget;
1411 }
1412 }
1413
1414 @Override
1415 public void visitApply(JCMethodInvocation tree) {
1416 boolean prevNeedsTarget = needsTarget;
1417 try {
1418 needsTarget = false;
1419 super.visitApply(tree);
1420 } finally {
1421 needsTarget = prevNeedsTarget;
1422 }
1423 }
1424 }
1425
1426 public void visitSkip(JCSkip tree) {
1427 result = null;
1428 }
1429
1430 public void visitBlock(JCBlock tree) {
1431 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1432 // Block is a static or instance initializer;
1433 // let the owner of the environment be a freshly
1434 // created BLOCK-method.
1435 Symbol fakeOwner =
1436 new MethodSymbol(tree.flags | BLOCK |
1437 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1438 env.info.scope.owner);
1439 final Env<AttrContext> localEnv =
1440 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1441
1442 if ((tree.flags & STATIC) != 0) {
1443 localEnv.info.staticLevel++;
1444 } else {
1445 localEnv.info.instanceInitializerBlock = true;
1446 }
1447 // Attribute all type annotations in the block
1448 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1449 annotate.flush();
1450 attribStats(tree.stats, localEnv);
1451
1452 {
1453 // Store init and clinit type annotations with the ClassSymbol
1454 // to allow output in Gen.normalizeDefs.
1455 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1456 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1457 if ((tree.flags & STATIC) != 0) {
1458 cs.appendClassInitTypeAttributes(tas);
1459 } else {
1460 cs.appendInitTypeAttributes(tas);
1461 }
1462 }
1463 } else {
1464 // Create a new local environment with a local scope.
1465 Env<AttrContext> localEnv =
1466 env.dup(tree, env.info.dup(env.info.scope.dup()));
1467 try {
1468 attribStats(tree.stats, localEnv);
1469 } finally {
1470 localEnv.info.scope.leave();
1471 }
1472 }
1473 result = null;
1474 }
1475
1476 public void visitDoLoop(JCDoWhileLoop tree) {
1477 attribStat(tree.body, env.dup(tree));
1478 attribExpr(tree.cond, env, syms.booleanType);
1479 handleLoopConditionBindings(matchBindings, tree, tree.body);
1480 result = null;
1481 }
1482
1483 public void visitWhileLoop(JCWhileLoop tree) {
1484 attribExpr(tree.cond, env, syms.booleanType);
1485 MatchBindings condBindings = matchBindings;
1486 // include condition's bindings when true in the body:
1487 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1488 try {
1489 attribStat(tree.body, whileEnv.dup(tree));
1490 } finally {
1491 whileEnv.info.scope.leave();
1492 }
1493 handleLoopConditionBindings(condBindings, tree, tree.body);
1494 result = null;
1495 }
1496
1497 public void visitForLoop(JCForLoop tree) {
1498 Env<AttrContext> loopEnv =
1499 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1500 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1501 try {
1502 attribStats(tree.init, loopEnv);
1503 if (tree.cond != null) {
1504 attribExpr(tree.cond, loopEnv, syms.booleanType);
1505 // include condition's bindings when true in the body and step:
1506 condBindings = matchBindings;
1507 }
1508 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1509 try {
1510 bodyEnv.tree = tree; // before, we were not in loop!
1511 attribStats(tree.step, bodyEnv);
1512 attribStat(tree.body, bodyEnv);
1513 } finally {
1514 bodyEnv.info.scope.leave();
1515 }
1516 result = null;
1517 }
1518 finally {
1519 loopEnv.info.scope.leave();
1520 }
1521 handleLoopConditionBindings(condBindings, tree, tree.body);
1522 }
1523
1524 /**
1525 * Include condition's bindings when false after the loop, if cannot get out of the loop
1526 */
1527 private void handleLoopConditionBindings(MatchBindings condBindings,
1528 JCStatement loop,
1529 JCStatement loopBody) {
1530 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1531 !breaksTo(env, loop, loopBody)) {
1532 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1533 }
1534 }
1535
1536 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1537 preFlow(body);
1538 return flow.breaksToTree(env, loop, body, make);
1539 }
1540
1541 /**
1542 * Add given bindings to the current scope, unless there's a break to
1543 * an immediately enclosing labeled statement.
1544 */
1545 private void addBindings2Scope(JCStatement introducingStatement,
1546 List<BindingSymbol> bindings) {
1547 if (bindings.isEmpty()) {
1548 return ;
1549 }
1550
1551 var searchEnv = env;
1552 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1553 labeled.body == introducingStatement) {
1554 if (breaksTo(env, labeled, labeled.body)) {
1555 //breaking to an immediately enclosing labeled statement
1556 return ;
1557 }
1558 searchEnv = searchEnv.next;
1559 introducingStatement = labeled;
1560 }
1561
1562 //include condition's body when false after the while, if cannot get out of the loop
1563 bindings.forEach(env.info.scope::enter);
1564 bindings.forEach(BindingSymbol::preserveBinding);
1565 }
1566
1567 public void visitForeachLoop(JCEnhancedForLoop tree) {
1568 Env<AttrContext> loopEnv =
1569 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1570 try {
1571 //the Formal Parameter of a for-each loop is not in the scope when
1572 //attributing the for-each expression; we mimic this by attributing
1573 //the for-each expression first (against original scope).
1574 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1575 chk.checkNonVoid(tree.pos(), exprType);
1576 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1577 if (elemtype == null) {
1578 // or perhaps expr implements Iterable<T>?
1579 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1580 if (base == null) {
1581 log.error(tree.expr.pos(),
1582 Errors.ForeachNotApplicableToType(exprType,
1583 Fragments.TypeReqArrayOrIterable));
1584 elemtype = types.createErrorType(exprType);
1585 } else {
1586 List<Type> iterableParams = base.allparams();
1587 elemtype = iterableParams.isEmpty()
1588 ? syms.objectType
1589 : types.wildUpperBound(iterableParams.head);
1590
1591 // Check the return type of the method iterator().
1592 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1593 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1594 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1595 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1596 log.error(tree.pos(),
1597 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1598 }
1599 }
1600 }
1601 if (tree.var.isImplicitlyTyped()) {
1602 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1603 setSyntheticVariableType(tree.var, inferredType);
1604 }
1605 attribStat(tree.var, loopEnv);
1606 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1607 loopEnv.tree = tree; // before, we were not in loop!
1608 attribStat(tree.body, loopEnv);
1609 result = null;
1610 }
1611 finally {
1612 loopEnv.info.scope.leave();
1613 }
1614 }
1615
1616 public void visitLabelled(JCLabeledStatement tree) {
1617 // Check that label is not used in an enclosing statement
1618 Env<AttrContext> env1 = env;
1619 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1620 if (env1.tree.hasTag(LABELLED) &&
1621 ((JCLabeledStatement) env1.tree).label == tree.label) {
1622 log.error(tree.pos(),
1623 Errors.LabelAlreadyInUse(tree.label));
1624 break;
1625 }
1626 env1 = env1.next;
1627 }
1628
1629 attribStat(tree.body, env.dup(tree));
1630 result = null;
1631 }
1632
1633 public void visitSwitch(JCSwitch tree) {
1634 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1635 attribStats(c.stats, caseEnv);
1636 });
1637 result = null;
1638 }
1639
1640 public void visitSwitchExpression(JCSwitchExpression tree) {
1641 boolean wrongContext = false;
1642
1643 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1644 PolyKind.STANDALONE : PolyKind.POLY;
1645
1646 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1647 //this means we are returning a poly conditional from void-compatible lambda expression
1648 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1649 resultInfo = recoveryInfo;
1650 wrongContext = true;
1651 }
1652
1653 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1654 unknownExprInfo :
1655 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1656
1657 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1658 ListBuffer<Type> caseTypes = new ListBuffer<>();
1659
1660 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1661 caseEnv.info.yieldResult = condInfo;
1662 attribStats(c.stats, caseEnv);
1663 new TreeScanner() {
1664 @Override
1665 public void visitYield(JCYield brk) {
1666 if (brk.target == tree) {
1667 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1668 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1669 }
1670 super.visitYield(brk);
1671 }
1672
1673 @Override public void visitClassDef(JCClassDecl tree) {}
1674 @Override public void visitLambda(JCLambda tree) {}
1675 }.scan(c.stats);
1676 });
1677
1678 if (tree.cases.isEmpty()) {
1679 log.error(tree.pos(),
1680 Errors.SwitchExpressionEmpty);
1681 } else if (caseTypes.isEmpty()) {
1682 log.error(tree.pos(),
1683 Errors.SwitchExpressionNoResultExpressions);
1684 }
1685
1686 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1687
1688 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1689 }
1690 //where:
1691 CheckContext switchExpressionContext(CheckContext checkContext) {
1692 return new Check.NestedCheckContext(checkContext) {
1693 //this will use enclosing check context to check compatibility of
1694 //subexpression against target type; if we are in a method check context,
1695 //depending on whether boxing is allowed, we could have incompatibilities
1696 @Override
1697 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1698 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1699 }
1700 };
1701 }
1702
1703 private void handleSwitch(JCTree switchTree,
1704 JCExpression selector,
1705 List<JCCase> cases,
1706 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1707 Type seltype = attribExpr(selector, env);
1708
1709 Env<AttrContext> switchEnv =
1710 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1711
1712 try {
1713 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1714 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1715 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1716 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1717 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1718 boolean patternSwitch;
1719 if (seltype.isPrimitive() && !intSwitch) {
1720 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1721 patternSwitch = true;
1722 }
1723 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1724 !intSwitch) {
1725 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1726 patternSwitch = true;
1727 } else {
1728 patternSwitch = cases.stream()
1729 .flatMap(c -> c.labels.stream())
1730 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1731 TreeInfo.isNullCaseLabel(l));
1732 }
1733
1734 // Attribute all cases and
1735 // check that there are no duplicate case labels or default clauses.
1736 Set<Object> constants = new HashSet<>(); // The set of case constants.
1737 boolean hasDefault = false; // Is there a default label?
1738 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1739 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1740 boolean hasNullPattern = false; // Is there a null pattern?
1741 CaseTree.CaseKind caseKind = null;
1742 boolean wasError = false;
1743 JCCaseLabel unconditionalCaseLabel = null;
1744 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1745 JCCase c = l.head;
1746 if (caseKind == null) {
1747 caseKind = c.caseKind;
1748 } else if (caseKind != c.caseKind && !wasError) {
1749 log.error(c.pos(),
1750 Errors.SwitchMixingCaseTypes);
1751 wasError = true;
1752 }
1753 MatchBindings currentBindings = null;
1754 MatchBindings guardBindings = null;
1755 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1756 JCCaseLabel label = labels.head;
1757 if (label instanceof JCConstantCaseLabel constLabel) {
1758 JCExpression expr = constLabel.expr;
1759 if (TreeInfo.isNull(expr)) {
1760 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1761 if (hasNullPattern) {
1762 log.error(label.pos(), Errors.DuplicateCaseLabel);
1763 }
1764 hasNullPattern = true;
1765 attribExpr(expr, switchEnv, seltype);
1766 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1767 } else if (enumSwitch) {
1768 Symbol sym = enumConstant(expr, seltype);
1769 if (sym == null) {
1770 if (allowPatternSwitch) {
1771 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1772 Symbol enumSym = TreeInfo.symbol(expr);
1773 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1774 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1775 } else if (!constants.add(enumSym)) {
1776 log.error(label.pos(), Errors.DuplicateCaseLabel);
1777 }
1778 } else {
1779 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1780 }
1781 } else if (!constants.add(sym)) {
1782 log.error(label.pos(), Errors.DuplicateCaseLabel);
1783 }
1784 } else if (errorEnumSwitch) {
1785 //error recovery: the selector is erroneous, and all the case labels
1786 //are identifiers. This could be an enum switch - don't report resolve
1787 //error for the case label:
1788 var prevResolveHelper = rs.basicLogResolveHelper;
1789 try {
1790 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1791 attribExpr(expr, switchEnv, seltype);
1792 } finally {
1793 rs.basicLogResolveHelper = prevResolveHelper;
1794 }
1795 } else {
1796 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1797 if (!pattype.hasTag(ERROR)) {
1798 if (pattype.constValue() == null) {
1799 Symbol s = TreeInfo.symbol(expr);
1800 if (s != null && s.kind == TYP) {
1801 log.error(expr.pos(),
1802 Errors.PatternExpected);
1803 } else if (s == null || !s.isEnum()) {
1804 log.error(expr.pos(),
1805 (stringSwitch ? Errors.StringConstReq
1806 : intSwitch ? Errors.ConstExprReq
1807 : Errors.PatternOrEnumReq));
1808 } else if (!constants.add(s)) {
1809 log.error(label.pos(), Errors.DuplicateCaseLabel);
1810 }
1811 }
1812 else {
1813 if (!stringSwitch && !intSwitch &&
1814 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1815 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1816 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1817 } else if (!constants.add(pattype.constValue())) {
1818 log.error(c.pos(), Errors.DuplicateCaseLabel);
1819 }
1820 }
1821 }
1822 }
1823 } else if (label instanceof JCDefaultCaseLabel def) {
1824 if (hasDefault) {
1825 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1826 } else if (hasUnconditionalPattern) {
1827 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1828 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1829 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1830 }
1831 hasDefault = true;
1832 matchBindings = MatchBindingsComputer.EMPTY;
1833 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1834 //pattern
1835 JCPattern pat = patternlabel.pat;
1836 attribExpr(pat, switchEnv, seltype);
1837 Type primaryType = TreeInfo.primaryPatternType(pat);
1838
1839 if (primaryType.isPrimitive()) {
1840 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1841 } else if (!primaryType.hasTag(TYPEVAR)) {
1842 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1843 }
1844 checkCastablePattern(pat.pos(), seltype, primaryType);
1845 Type patternType = types.erasure(primaryType);
1846 JCExpression guard = c.guard;
1847 if (guardBindings == null && guard != null) {
1848 MatchBindings afterPattern = matchBindings;
1849 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1850 try {
1851 attribExpr(guard, bodyEnv, syms.booleanType);
1852 } finally {
1853 bodyEnv.info.scope.leave();
1854 }
1855
1856 guardBindings = matchBindings;
1857 matchBindings = afterPattern;
1858
1859 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1860 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1861 }
1862 }
1863 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1864 boolean unconditional =
1865 unguarded &&
1866 !patternType.isErroneous() &&
1867 types.isUnconditionallyExact(seltype, patternType);
1868 if (unconditional) {
1869 if (hasUnconditionalPattern) {
1870 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1871 } else if (hasDefault) {
1872 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1873 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1874 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1875 }
1876 hasUnconditionalPattern = true;
1877 unconditionalCaseLabel = label;
1878 }
1879 lastPatternErroneous = patternType.isErroneous();
1880 } else {
1881 Assert.error();
1882 }
1883 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1884 }
1885
1886 if (guardBindings != null) {
1887 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1888 }
1889
1890 Env<AttrContext> caseEnv =
1891 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1892 try {
1893 attribCase.accept(c, caseEnv);
1894 } finally {
1895 caseEnv.info.scope.leave();
1896 }
1897 addVars(c.stats, switchEnv.info.scope);
1898
1899 preFlow(c);
1900 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1901 }
1902 if (patternSwitch) {
1903 chk.checkSwitchCaseStructure(cases);
1904 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1905 }
1906 if (switchTree.hasTag(SWITCH)) {
1907 ((JCSwitch) switchTree).hasUnconditionalPattern =
1908 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1909 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1910 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1911 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1912 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1913 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1914 } else {
1915 Assert.error(switchTree.getTag().name());
1916 }
1917 } finally {
1918 switchEnv.info.scope.leave();
1919 }
1920 }
1921 // where
1922 private ResultInfo caseLabelResultInfo(Type seltype) {
1923 return new ResultInfo(KindSelector.VAL_TYP,
1924 !seltype.hasTag(ERROR) ? seltype
1925 : Type.noType);
1926 }
1927 /** Add any variables defined in stats to the switch scope. */
1928 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1929 for (;stats.nonEmpty(); stats = stats.tail) {
1930 JCTree stat = stats.head;
1931 if (stat.hasTag(VARDEF))
1932 switchScope.enter(((JCVariableDecl) stat).sym);
1933 }
1934 }
1935 // where
1936 /** Return the selected enumeration constant symbol, or null. */
1937 private Symbol enumConstant(JCTree tree, Type enumType) {
1938 if (tree.hasTag(IDENT)) {
1939 JCIdent ident = (JCIdent)tree;
1940 Name name = ident.name;
1941 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1942 if (sym.kind == VAR) {
1943 Symbol s = ident.sym = sym;
1944 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1945 ident.type = s.type;
1946 return ((s.flags_field & Flags.ENUM) == 0)
1947 ? null : s;
1948 }
1949 }
1950 }
1951 return null;
1952 }
1953
1954 public void visitSynchronized(JCSynchronized tree) {
1955 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1956 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) &&
1957 identityType &&
1958 isValueBased(tree.lock.type)) {
1959 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1960 }
1961 attribStat(tree.body, env);
1962 result = null;
1963 }
1964 // where
1965 private boolean isValueBased(Type t) {
1966 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1967 }
1968
1969 public void visitTry(JCTry tree) {
1970 // Create a new local environment with a local
1971 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1972 try {
1973 boolean isTryWithResource = tree.resources.nonEmpty();
1974 // Create a nested environment for attributing the try block if needed
1975 Env<AttrContext> tryEnv = isTryWithResource ?
1976 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1977 localEnv;
1978 try {
1979 // Attribute resource declarations
1980 for (JCTree resource : tree.resources) {
1981 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1982 @Override
1983 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1984 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1985 }
1986 };
1987 ResultInfo twrResult =
1988 new ResultInfo(KindSelector.VAR,
1989 syms.autoCloseableType,
1990 twrContext);
1991 if (resource.hasTag(VARDEF)) {
1992 attribStat(resource, tryEnv);
1993 twrResult.check(resource, resource.type);
1994
1995 //check that resource type cannot throw InterruptedException
1996 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1997
1998 VarSymbol var = ((JCVariableDecl) resource).sym;
1999
2000 var.flags_field |= Flags.FINAL;
2001 var.setData(ElementKind.RESOURCE_VARIABLE);
2002 } else {
2003 attribTree(resource, tryEnv, twrResult);
2004 }
2005 }
2006 // Attribute body
2007 attribStat(tree.body, tryEnv);
2008 } finally {
2009 if (isTryWithResource)
2010 tryEnv.info.scope.leave();
2011 }
2012
2013 // Attribute catch clauses
2014 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2015 JCCatch c = l.head;
2016 Env<AttrContext> catchEnv =
2017 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2018 try {
2019 Type ctype = attribStat(c.param, catchEnv);
2020 if (TreeInfo.isMultiCatch(c)) {
2021 //multi-catch parameter is implicitly marked as final
2022 c.param.sym.flags_field |= FINAL | UNION;
2023 }
2024 if (c.param.sym.kind == VAR) {
2025 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2026 }
2027 chk.checkType(c.param.vartype.pos(),
2028 chk.checkClassType(c.param.vartype.pos(), ctype),
2029 syms.throwableType);
2030 attribStat(c.body, catchEnv);
2031 } finally {
2032 catchEnv.info.scope.leave();
2033 }
2034 }
2035
2036 // Attribute finalizer
2037 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2038 result = null;
2039 }
2040 finally {
2041 localEnv.info.scope.leave();
2042 }
2043 }
2044
2045 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2046 if (!resource.isErroneous() &&
2047 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2048 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2049 Symbol close = syms.noSymbol;
2050 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2051 try {
2052 close = rs.resolveQualifiedMethod(pos,
2053 env,
2054 types.skipTypeVars(resource, false),
2055 names.close,
2056 List.nil(),
2057 List.nil());
2058 }
2059 finally {
2060 log.popDiagnosticHandler(discardHandler);
2061 }
2062 if (close.kind == MTH &&
2063 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2064 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2065 env.info.lint.isEnabled(LintCategory.TRY)) {
2066 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2067 }
2068 }
2069 }
2070
2071 public void visitConditional(JCConditional tree) {
2072 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2073 MatchBindings condBindings = matchBindings;
2074
2075 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2076 isBooleanOrNumeric(env, tree)) ?
2077 PolyKind.STANDALONE : PolyKind.POLY;
2078
2079 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2080 //this means we are returning a poly conditional from void-compatible lambda expression
2081 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2082 result = tree.type = types.createErrorType(resultInfo.pt);
2083 return;
2084 }
2085
2086 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2087 unknownExprInfo :
2088 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2089
2090
2091 // x ? y : z
2092 // include x's bindings when true in y
2093 // include x's bindings when false in z
2094
2095 Type truetype;
2096 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2097 try {
2098 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2099 } finally {
2100 trueEnv.info.scope.leave();
2101 }
2102
2103 MatchBindings trueBindings = matchBindings;
2104
2105 Type falsetype;
2106 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2107 try {
2108 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2109 } finally {
2110 falseEnv.info.scope.leave();
2111 }
2112
2113 MatchBindings falseBindings = matchBindings;
2114
2115 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2116 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2117 List.of(truetype, falsetype)) : pt();
2118 if (condtype.constValue() != null &&
2119 truetype.constValue() != null &&
2120 falsetype.constValue() != null &&
2121 !owntype.hasTag(NONE)) {
2122 //constant folding
2123 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2124 }
2125 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2126 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2127 }
2128 //where
2129 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2130 switch (tree.getTag()) {
2131 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2132 ((JCLiteral)tree).typetag == BOOLEAN ||
2133 ((JCLiteral)tree).typetag == BOT;
2134 case LAMBDA: case REFERENCE: return false;
2135 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2136 case CONDEXPR:
2137 JCConditional condTree = (JCConditional)tree;
2138 return isBooleanOrNumeric(env, condTree.truepart) &&
2139 isBooleanOrNumeric(env, condTree.falsepart);
2140 case APPLY:
2141 JCMethodInvocation speculativeMethodTree =
2142 (JCMethodInvocation)deferredAttr.attribSpeculative(
2143 tree, env, unknownExprInfo,
2144 argumentAttr.withLocalCacheContext());
2145 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2146 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2147 env.enclClass.type :
2148 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2149 Type owntype = types.memberType(receiverType, msym).getReturnType();
2150 return primitiveOrBoxed(owntype);
2151 case NEWCLASS:
2152 JCExpression className =
2153 removeClassParams.translate(((JCNewClass)tree).clazz);
2154 JCExpression speculativeNewClassTree =
2155 (JCExpression)deferredAttr.attribSpeculative(
2156 className, env, unknownTypeInfo,
2157 argumentAttr.withLocalCacheContext());
2158 return primitiveOrBoxed(speculativeNewClassTree.type);
2159 default:
2160 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2161 argumentAttr.withLocalCacheContext()).type;
2162 return primitiveOrBoxed(speculativeType);
2163 }
2164 }
2165 //where
2166 boolean primitiveOrBoxed(Type t) {
2167 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2168 }
2169
2170 TreeTranslator removeClassParams = new TreeTranslator() {
2171 @Override
2172 public void visitTypeApply(JCTypeApply tree) {
2173 result = translate(tree.clazz);
2174 }
2175 };
2176
2177 CheckContext conditionalContext(CheckContext checkContext) {
2178 return new Check.NestedCheckContext(checkContext) {
2179 //this will use enclosing check context to check compatibility of
2180 //subexpression against target type; if we are in a method check context,
2181 //depending on whether boxing is allowed, we could have incompatibilities
2182 @Override
2183 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2184 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2185 }
2186 };
2187 }
2188
2189 /** Compute the type of a conditional expression, after
2190 * checking that it exists. See JLS 15.25. Does not take into
2191 * account the special case where condition and both arms
2192 * are constants.
2193 *
2194 * @param pos The source position to be used for error
2195 * diagnostics.
2196 * @param thentype The type of the expression's then-part.
2197 * @param elsetype The type of the expression's else-part.
2198 */
2199 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2200 if (condTypes.isEmpty()) {
2201 return syms.objectType; //TODO: how to handle?
2202 }
2203 Type first = condTypes.head;
2204 // If same type, that is the result
2205 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2206 return first.baseType();
2207
2208 List<Type> unboxedTypes = condTypes.stream()
2209 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2210 .collect(List.collector());
2211
2212 // Otherwise, if both arms can be converted to a numeric
2213 // type, return the least numeric type that fits both arms
2214 // (i.e. return larger of the two, or return int if one
2215 // arm is short, the other is char).
2216 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2217 // If one arm has an integer subrange type (i.e., byte,
2218 // short, or char), and the other is an integer constant
2219 // that fits into the subrange, return the subrange type.
2220 for (Type type : unboxedTypes) {
2221 if (!type.getTag().isStrictSubRangeOf(INT)) {
2222 continue;
2223 }
2224 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2225 return type.baseType();
2226 }
2227
2228 for (TypeTag tag : primitiveTags) {
2229 Type candidate = syms.typeOfTag[tag.ordinal()];
2230 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2231 return candidate;
2232 }
2233 }
2234 }
2235
2236 // Those were all the cases that could result in a primitive
2237 condTypes = condTypes.stream()
2238 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2239 .collect(List.collector());
2240
2241 for (Type type : condTypes) {
2242 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2243 return type.baseType();
2244 }
2245
2246 Iterator<DiagnosticPosition> posIt = positions.iterator();
2247
2248 condTypes = condTypes.stream()
2249 .map(t -> chk.checkNonVoid(posIt.next(), t))
2250 .collect(List.collector());
2251
2252 // both are known to be reference types. The result is
2253 // lub(thentype,elsetype). This cannot fail, as it will
2254 // always be possible to infer "Object" if nothing better.
2255 return types.lub(condTypes.stream()
2256 .map(t -> t.baseType())
2257 .filter(t -> !t.hasTag(BOT))
2258 .collect(List.collector()));
2259 }
2260
2261 static final TypeTag[] primitiveTags = new TypeTag[]{
2262 BYTE,
2263 CHAR,
2264 SHORT,
2265 INT,
2266 LONG,
2267 FLOAT,
2268 DOUBLE,
2269 BOOLEAN,
2270 };
2271
2272 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2273 return bindingEnv(env, env.tree, bindings);
2274 }
2275
2276 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2277 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2278 bindings.forEach(env1.info.scope::enter);
2279 return env1;
2280 }
2281
2282 public void visitIf(JCIf tree) {
2283 attribExpr(tree.cond, env, syms.booleanType);
2284
2285 // if (x) { y } [ else z ]
2286 // include x's bindings when true in y
2287 // include x's bindings when false in z
2288
2289 MatchBindings condBindings = matchBindings;
2290 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2291
2292 try {
2293 attribStat(tree.thenpart, thenEnv);
2294 } finally {
2295 thenEnv.info.scope.leave();
2296 }
2297
2298 preFlow(tree.thenpart);
2299 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2300 boolean aliveAfterElse;
2301
2302 if (tree.elsepart != null) {
2303 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2304 try {
2305 attribStat(tree.elsepart, elseEnv);
2306 } finally {
2307 elseEnv.info.scope.leave();
2308 }
2309 preFlow(tree.elsepart);
2310 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2311 } else {
2312 aliveAfterElse = true;
2313 }
2314
2315 chk.checkEmptyIf(tree);
2316
2317 List<BindingSymbol> afterIfBindings = List.nil();
2318
2319 if (aliveAfterThen && !aliveAfterElse) {
2320 afterIfBindings = condBindings.bindingsWhenTrue;
2321 } else if (aliveAfterElse && !aliveAfterThen) {
2322 afterIfBindings = condBindings.bindingsWhenFalse;
2323 }
2324
2325 addBindings2Scope(tree, afterIfBindings);
2326
2327 result = null;
2328 }
2329
2330 void preFlow(JCTree tree) {
2331 attrRecover.doRecovery();
2332 new PostAttrAnalyzer() {
2333 @Override
2334 public void scan(JCTree tree) {
2335 if (tree == null ||
2336 (tree.type != null &&
2337 tree.type == Type.stuckType)) {
2338 //don't touch stuck expressions!
2339 return;
2340 }
2341 super.scan(tree);
2342 }
2343
2344 @Override
2345 public void visitClassDef(JCClassDecl that) {
2346 if (that.sym != null) {
2347 // Method preFlow shouldn't visit class definitions
2348 // that have not been entered and attributed.
2349 // See JDK-8254557 and JDK-8203277 for more details.
2350 super.visitClassDef(that);
2351 }
2352 }
2353
2354 @Override
2355 public void visitLambda(JCLambda that) {
2356 if (that.type != null) {
2357 // Method preFlow shouldn't visit lambda expressions
2358 // that have not been entered and attributed.
2359 // See JDK-8254557 and JDK-8203277 for more details.
2360 super.visitLambda(that);
2361 }
2362 }
2363 }.scan(tree);
2364 }
2365
2366 public void visitExec(JCExpressionStatement tree) {
2367 //a fresh environment is required for 292 inference to work properly ---
2368 //see Infer.instantiatePolymorphicSignatureInstance()
2369 Env<AttrContext> localEnv = env.dup(tree);
2370 attribExpr(tree.expr, localEnv);
2371 result = null;
2372 }
2373
2374 public void visitBreak(JCBreak tree) {
2375 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2376 result = null;
2377 }
2378
2379 public void visitYield(JCYield tree) {
2380 if (env.info.yieldResult != null) {
2381 attribTree(tree.value, env, env.info.yieldResult);
2382 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2383 } else {
2384 log.error(tree.pos(), tree.value.hasTag(PARENS)
2385 ? Errors.NoSwitchExpressionQualify
2386 : Errors.NoSwitchExpression);
2387 attribTree(tree.value, env, unknownExprInfo);
2388 }
2389 result = null;
2390 }
2391
2392 public void visitContinue(JCContinue tree) {
2393 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2394 result = null;
2395 }
2396 //where
2397 /** Return the target of a break, continue or yield statement,
2398 * if it exists, report an error if not.
2399 * Note: The target of a labelled break or continue is the
2400 * (non-labelled) statement tree referred to by the label,
2401 * not the tree representing the labelled statement itself.
2402 *
2403 * @param pos The position to be used for error diagnostics
2404 * @param tag The tag of the jump statement. This is either
2405 * Tree.BREAK or Tree.CONTINUE.
2406 * @param label The label of the jump statement, or null if no
2407 * label is given.
2408 * @param env The environment current at the jump statement.
2409 */
2410 private JCTree findJumpTarget(DiagnosticPosition pos,
2411 JCTree.Tag tag,
2412 Name label,
2413 Env<AttrContext> env) {
2414 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2415
2416 if (jumpTarget.snd != null) {
2417 log.error(pos, jumpTarget.snd);
2418 }
2419
2420 return jumpTarget.fst;
2421 }
2422 /** Return the target of a break or continue statement, if it exists,
2423 * report an error if not.
2424 * Note: The target of a labelled break or continue is the
2425 * (non-labelled) statement tree referred to by the label,
2426 * not the tree representing the labelled statement itself.
2427 *
2428 * @param tag The tag of the jump statement. This is either
2429 * Tree.BREAK or Tree.CONTINUE.
2430 * @param label The label of the jump statement, or null if no
2431 * label is given.
2432 * @param env The environment current at the jump statement.
2433 */
2434 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2435 Name label,
2436 Env<AttrContext> env) {
2437 // Search environments outwards from the point of jump.
2438 Env<AttrContext> env1 = env;
2439 JCDiagnostic.Error pendingError = null;
2440 LOOP:
2441 while (env1 != null) {
2442 switch (env1.tree.getTag()) {
2443 case LABELLED:
2444 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2445 if (label == labelled.label) {
2446 // If jump is a continue, check that target is a loop.
2447 if (tag == CONTINUE) {
2448 if (!labelled.body.hasTag(DOLOOP) &&
2449 !labelled.body.hasTag(WHILELOOP) &&
2450 !labelled.body.hasTag(FORLOOP) &&
2451 !labelled.body.hasTag(FOREACHLOOP)) {
2452 pendingError = Errors.NotLoopLabel(label);
2453 }
2454 // Found labelled statement target, now go inwards
2455 // to next non-labelled tree.
2456 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2457 } else {
2458 return Pair.of(labelled, pendingError);
2459 }
2460 }
2461 break;
2462 case DOLOOP:
2463 case WHILELOOP:
2464 case FORLOOP:
2465 case FOREACHLOOP:
2466 if (label == null) return Pair.of(env1.tree, pendingError);
2467 break;
2468 case SWITCH:
2469 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2470 break;
2471 case SWITCH_EXPRESSION:
2472 if (tag == YIELD) {
2473 return Pair.of(env1.tree, null);
2474 } else if (tag == BREAK) {
2475 pendingError = Errors.BreakOutsideSwitchExpression;
2476 } else {
2477 pendingError = Errors.ContinueOutsideSwitchExpression;
2478 }
2479 break;
2480 case LAMBDA:
2481 case METHODDEF:
2482 case CLASSDEF:
2483 break LOOP;
2484 default:
2485 }
2486 env1 = env1.next;
2487 }
2488 if (label != null)
2489 return Pair.of(null, Errors.UndefLabel(label));
2490 else if (pendingError != null)
2491 return Pair.of(null, pendingError);
2492 else if (tag == CONTINUE)
2493 return Pair.of(null, Errors.ContOutsideLoop);
2494 else
2495 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2496 }
2497
2498 public void visitReturn(JCReturn tree) {
2499 // Check that there is an enclosing method which is
2500 // nested within than the enclosing class.
2501 if (env.info.returnResult == null) {
2502 log.error(tree.pos(), Errors.RetOutsideMeth);
2503 } else if (env.info.yieldResult != null) {
2504 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2505 } else if (!env.info.isLambda &&
2506 !env.info.isNewClass &&
2507 env.enclMethod != null &&
2508 TreeInfo.isCompactConstructor(env.enclMethod)) {
2509 log.error(env.enclMethod,
2510 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2511 } else {
2512 // Attribute return expression, if it exists, and check that
2513 // it conforms to result type of enclosing method.
2514 if (tree.expr != null) {
2515 if (env.info.returnResult.pt.hasTag(VOID)) {
2516 env.info.returnResult.checkContext.report(tree.expr.pos(),
2517 diags.fragment(Fragments.UnexpectedRetVal));
2518 }
2519 attribTree(tree.expr, env, env.info.returnResult);
2520 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2521 !env.info.returnResult.pt.hasTag(NONE)) {
2522 env.info.returnResult.checkContext.report(tree.pos(),
2523 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2524 }
2525 }
2526 result = null;
2527 }
2528
2529 public void visitThrow(JCThrow tree) {
2530 Type owntype = attribExpr(tree.expr, env, Type.noType);
2531 chk.checkType(tree, owntype, syms.throwableType);
2532 result = null;
2533 }
2534
2535 public void visitAssert(JCAssert tree) {
2536 attribExpr(tree.cond, env, syms.booleanType);
2537 if (tree.detail != null) {
2538 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2539 }
2540 result = null;
2541 }
2542
2543 /** Visitor method for method invocations.
2544 * NOTE: The method part of an application will have in its type field
2545 * the return type of the method, not the method's type itself!
2546 */
2547 public void visitApply(JCMethodInvocation tree) {
2548 // The local environment of a method application is
2549 // a new environment nested in the current one.
2550 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2551
2552 // The types of the actual method arguments.
2553 List<Type> argtypes;
2554
2555 // The types of the actual method type arguments.
2556 List<Type> typeargtypes = null;
2557
2558 Name methName = TreeInfo.name(tree.meth);
2559
2560 boolean isConstructorCall =
2561 methName == names._this || methName == names._super;
2562
2563 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2564 if (isConstructorCall) {
2565
2566 // Attribute arguments, yielding list of argument types.
2567 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2568 argtypes = argtypesBuf.toList();
2569 typeargtypes = attribTypes(tree.typeargs, localEnv);
2570
2571 // Done with this()/super() parameters. End of constructor prologue.
2572 env.info.ctorPrologue = false;
2573
2574 // Variable `site' points to the class in which the called
2575 // constructor is defined.
2576 Type site = env.enclClass.sym.type;
2577 if (methName == names._super) {
2578 if (site == syms.objectType) {
2579 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2580 site = types.createErrorType(syms.objectType);
2581 } else {
2582 site = types.supertype(site);
2583 }
2584 }
2585
2586 if (site.hasTag(CLASS)) {
2587 Type encl = site.getEnclosingType();
2588 while (encl != null && encl.hasTag(TYPEVAR))
2589 encl = encl.getUpperBound();
2590 if (encl.hasTag(CLASS)) {
2591 // we are calling a nested class
2592
2593 if (tree.meth.hasTag(SELECT)) {
2594 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2595
2596 // We are seeing a prefixed call, of the form
2597 // <expr>.super(...).
2598 // Check that the prefix expression conforms
2599 // to the outer instance type of the class.
2600 chk.checkRefType(qualifier.pos(),
2601 attribExpr(qualifier, localEnv,
2602 encl));
2603 } else if (methName == names._super) {
2604 // qualifier omitted; check for existence
2605 // of an appropriate implicit qualifier.
2606 rs.resolveImplicitThis(tree.meth.pos(),
2607 localEnv, site, true);
2608 }
2609 } else if (tree.meth.hasTag(SELECT)) {
2610 log.error(tree.meth.pos(),
2611 Errors.IllegalQualNotIcls(site.tsym));
2612 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2613 }
2614
2615 // if we're calling a java.lang.Enum constructor,
2616 // prefix the implicit String and int parameters
2617 if (site.tsym == syms.enumSym)
2618 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2619
2620 // Resolve the called constructor under the assumption
2621 // that we are referring to a superclass instance of the
2622 // current instance (JLS ???).
2623 boolean selectSuperPrev = localEnv.info.selectSuper;
2624 localEnv.info.selectSuper = true;
2625 localEnv.info.pendingResolutionPhase = null;
2626 Symbol sym = rs.resolveConstructor(
2627 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2628 localEnv.info.selectSuper = selectSuperPrev;
2629
2630 // Set method symbol to resolved constructor...
2631 TreeInfo.setSymbol(tree.meth, sym);
2632
2633 // ...and check that it is legal in the current context.
2634 // (this will also set the tree's type)
2635 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2636 checkId(tree.meth, site, sym, localEnv,
2637 new ResultInfo(kind, mpt));
2638 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2639 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2640 }
2641 // Otherwise, `site' is an error type and we do nothing
2642 result = tree.type = syms.voidType;
2643 } else {
2644 // Otherwise, we are seeing a regular method call.
2645 // Attribute the arguments, yielding list of argument types, ...
2646 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2647 argtypes = argtypesBuf.toList();
2648 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2649
2650 // ... and attribute the method using as a prototype a methodtype
2651 // whose formal argument types is exactly the list of actual
2652 // arguments (this will also set the method symbol).
2653 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2654 localEnv.info.pendingResolutionPhase = null;
2655 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2656
2657 // Compute the result type.
2658 Type restype = mtype.getReturnType();
2659 if (restype.hasTag(WILDCARD))
2660 throw new AssertionError(mtype);
2661
2662 Type qualifier = (tree.meth.hasTag(SELECT))
2663 ? ((JCFieldAccess) tree.meth).selected.type
2664 : env.enclClass.sym.type;
2665 Symbol msym = TreeInfo.symbol(tree.meth);
2666 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2667
2668 chk.checkRefTypes(tree.typeargs, typeargtypes);
2669
2670 // Check that value of resulting type is admissible in the
2671 // current context. Also, capture the return type
2672 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2673 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2674 }
2675 chk.validate(tree.typeargs, localEnv);
2676 }
2677 //where
2678 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2679 if (msym != null &&
2680 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2681 methodName == names.getClass &&
2682 argtypes.isEmpty()) {
2683 // as a special case, x.getClass() has type Class<? extends |X|>
2684 return new ClassType(restype.getEnclosingType(),
2685 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2686 BoundKind.EXTENDS,
2687 syms.boundClass)),
2688 restype.tsym,
2689 restype.getMetadata());
2690 } else if (msym != null &&
2691 msym.owner == syms.arrayClass &&
2692 methodName == names.clone &&
2693 types.isArray(qualifierType)) {
2694 // as a special case, array.clone() has a result that is
2695 // the same as static type of the array being cloned
2696 return qualifierType;
2697 } else {
2698 return restype;
2699 }
2700 }
2701
2702 /** Obtain a method type with given argument types.
2703 */
2704 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2705 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2706 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2707 }
2708
2709 public void visitNewClass(final JCNewClass tree) {
2710 Type owntype = types.createErrorType(tree.type);
2711
2712 // The local environment of a class creation is
2713 // a new environment nested in the current one.
2714 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2715
2716 // The anonymous inner class definition of the new expression,
2717 // if one is defined by it.
2718 JCClassDecl cdef = tree.def;
2719
2720 // If enclosing class is given, attribute it, and
2721 // complete class name to be fully qualified
2722 JCExpression clazz = tree.clazz; // Class field following new
2723 JCExpression clazzid; // Identifier in class field
2724 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2725 annoclazzid = null;
2726
2727 if (clazz.hasTag(TYPEAPPLY)) {
2728 clazzid = ((JCTypeApply) clazz).clazz;
2729 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2730 annoclazzid = (JCAnnotatedType) clazzid;
2731 clazzid = annoclazzid.underlyingType;
2732 }
2733 } else {
2734 if (clazz.hasTag(ANNOTATED_TYPE)) {
2735 annoclazzid = (JCAnnotatedType) clazz;
2736 clazzid = annoclazzid.underlyingType;
2737 } else {
2738 clazzid = clazz;
2739 }
2740 }
2741
2742 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2743
2744 if (tree.encl != null) {
2745 // We are seeing a qualified new, of the form
2746 // <expr>.new C <...> (...) ...
2747 // In this case, we let clazz stand for the name of the
2748 // allocated class C prefixed with the type of the qualifier
2749 // expression, so that we can
2750 // resolve it with standard techniques later. I.e., if
2751 // <expr> has type T, then <expr>.new C <...> (...)
2752 // yields a clazz T.C.
2753 Type encltype = chk.checkRefType(tree.encl.pos(),
2754 attribExpr(tree.encl, env));
2755 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2756 // from expr to the combined type, or not? Yes, do this.
2757 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2758 ((JCIdent) clazzid).name);
2759
2760 EndPosTable endPosTable = this.env.toplevel.endPositions;
2761 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2762 if (clazz.hasTag(ANNOTATED_TYPE)) {
2763 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2764 List<JCAnnotation> annos = annoType.annotations;
2765
2766 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2767 clazzid1 = make.at(tree.pos).
2768 TypeApply(clazzid1,
2769 ((JCTypeApply) clazz).arguments);
2770 }
2771
2772 clazzid1 = make.at(tree.pos).
2773 AnnotatedType(annos, clazzid1);
2774 } else if (clazz.hasTag(TYPEAPPLY)) {
2775 clazzid1 = make.at(tree.pos).
2776 TypeApply(clazzid1,
2777 ((JCTypeApply) clazz).arguments);
2778 }
2779
2780 clazz = clazzid1;
2781 }
2782
2783 // Attribute clazz expression and store
2784 // symbol + type back into the attributed tree.
2785 Type clazztype;
2786
2787 try {
2788 env.info.isNewClass = true;
2789 clazztype = TreeInfo.isEnumInit(env.tree) ?
2790 attribIdentAsEnumType(env, (JCIdent)clazz) :
2791 attribType(clazz, env);
2792 } finally {
2793 env.info.isNewClass = false;
2794 }
2795
2796 clazztype = chk.checkDiamond(tree, clazztype);
2797 chk.validate(clazz, localEnv);
2798 if (tree.encl != null) {
2799 // We have to work in this case to store
2800 // symbol + type back into the attributed tree.
2801 tree.clazz.type = clazztype;
2802 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2803 clazzid.type = ((JCIdent) clazzid).sym.type;
2804 if (annoclazzid != null) {
2805 annoclazzid.type = clazzid.type;
2806 }
2807 if (!clazztype.isErroneous()) {
2808 if (cdef != null && clazztype.tsym.isInterface()) {
2809 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2810 } else if (clazztype.tsym.isStatic()) {
2811 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2812 }
2813 }
2814 } else if (!clazztype.tsym.isInterface() &&
2815 clazztype.getEnclosingType().hasTag(CLASS)) {
2816 // Check for the existence of an apropos outer instance
2817 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2818 }
2819
2820 // Attribute constructor arguments.
2821 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2822 final KindSelector pkind =
2823 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2824 List<Type> argtypes = argtypesBuf.toList();
2825 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2826
2827 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2828 // Enums may not be instantiated except implicitly
2829 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2830 (!env.tree.hasTag(VARDEF) ||
2831 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2832 ((JCVariableDecl) env.tree).init != tree))
2833 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2834
2835 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2836 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2837 boolean skipNonDiamondPath = false;
2838 // Check that class is not abstract
2839 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2840 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2841 log.error(tree.pos(),
2842 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2843 skipNonDiamondPath = true;
2844 } else if (cdef != null && clazztype.tsym.isInterface()) {
2845 // Check that no constructor arguments are given to
2846 // anonymous classes implementing an interface
2847 if (!argtypes.isEmpty())
2848 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2849
2850 if (!typeargtypes.isEmpty())
2851 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2852
2853 // Error recovery: pretend no arguments were supplied.
2854 argtypes = List.nil();
2855 typeargtypes = List.nil();
2856 skipNonDiamondPath = true;
2857 }
2858 if (TreeInfo.isDiamond(tree)) {
2859 ClassType site = new ClassType(clazztype.getEnclosingType(),
2860 clazztype.tsym.type.getTypeArguments(),
2861 clazztype.tsym,
2862 clazztype.getMetadata());
2863
2864 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2865 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2866 diamondEnv.info.pendingResolutionPhase = null;
2867
2868 //if the type of the instance creation expression is a class type
2869 //apply method resolution inference (JLS 15.12.2.7). The return type
2870 //of the resolved constructor will be a partially instantiated type
2871 Symbol constructor = rs.resolveDiamond(tree.pos(),
2872 diamondEnv,
2873 site,
2874 argtypes,
2875 typeargtypes);
2876 tree.constructor = constructor.baseSymbol();
2877
2878 final TypeSymbol csym = clazztype.tsym;
2879 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2880 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2881 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2882 constructorType = checkId(tree, site,
2883 constructor,
2884 diamondEnv,
2885 diamondResult);
2886
2887 tree.clazz.type = types.createErrorType(clazztype);
2888 if (!constructorType.isErroneous()) {
2889 tree.clazz.type = clazz.type = constructorType.getReturnType();
2890 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2891 }
2892 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2893 }
2894
2895 // Resolve the called constructor under the assumption
2896 // that we are referring to a superclass instance of the
2897 // current instance (JLS ???).
2898 else if (!skipNonDiamondPath) {
2899 //the following code alters some of the fields in the current
2900 //AttrContext - hence, the current context must be dup'ed in
2901 //order to avoid downstream failures
2902 Env<AttrContext> rsEnv = localEnv.dup(tree);
2903 rsEnv.info.selectSuper = cdef != null;
2904 rsEnv.info.pendingResolutionPhase = null;
2905 tree.constructor = rs.resolveConstructor(
2906 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2907 if (cdef == null) { //do not check twice!
2908 tree.constructorType = checkId(tree,
2909 clazztype,
2910 tree.constructor,
2911 rsEnv,
2912 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2913 if (rsEnv.info.lastResolveVarargs())
2914 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2915 }
2916 }
2917
2918 if (cdef != null) {
2919 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2920 return;
2921 }
2922
2923 if (tree.constructor != null && tree.constructor.kind == MTH)
2924 owntype = clazztype;
2925 }
2926 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2927 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2928 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2929 //we need to wait for inference to finish and then replace inference vars in the constructor type
2930 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2931 instantiatedContext -> {
2932 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2933 });
2934 }
2935 chk.validate(tree.typeargs, localEnv);
2936 }
2937
2938 // where
2939 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2940 JCClassDecl cdef, Env<AttrContext> localEnv,
2941 List<Type> argtypes, List<Type> typeargtypes,
2942 KindSelector pkind) {
2943 // We are seeing an anonymous class instance creation.
2944 // In this case, the class instance creation
2945 // expression
2946 //
2947 // E.new <typeargs1>C<typargs2>(args) { ... }
2948 //
2949 // is represented internally as
2950 //
2951 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2952 //
2953 // This expression is then *transformed* as follows:
2954 //
2955 // (1) add an extends or implements clause
2956 // (2) add a constructor.
2957 //
2958 // For instance, if C is a class, and ET is the type of E,
2959 // the expression
2960 //
2961 // E.new <typeargs1>C<typargs2>(args) { ... }
2962 //
2963 // is translated to (where X is a fresh name and typarams is the
2964 // parameter list of the super constructor):
2965 //
2966 // new <typeargs1>X(<*nullchk*>E, args) where
2967 // X extends C<typargs2> {
2968 // <typarams> X(ET e, args) {
2969 // e.<typeargs1>super(args)
2970 // }
2971 // ...
2972 // }
2973 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2974 Type enclType = clazztype.getEnclosingType();
2975 if (enclType != null &&
2976 enclType.hasTag(CLASS) &&
2977 !chk.checkDenotable((ClassType)enclType)) {
2978 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2979 }
2980 final boolean isDiamond = TreeInfo.isDiamond(tree);
2981 if (isDiamond
2982 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2983 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2984 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2985 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2986 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2987 instantiatedContext -> {
2988 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2989 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2990 ResultInfo prevResult = this.resultInfo;
2991 try {
2992 this.resultInfo = resultInfoForClassDefinition;
2993 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2994 dupLocalEnv, argtypes, typeargtypes, pkind);
2995 } finally {
2996 this.resultInfo = prevResult;
2997 }
2998 });
2999 } else {
3000 if (isDiamond && clazztype.hasTag(CLASS)) {
3001 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3002 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3003 // One or more types inferred in the previous steps is non-denotable.
3004 Fragment fragment = Diamond(clazztype.tsym);
3005 log.error(tree.clazz.pos(),
3006 Errors.CantApplyDiamond1(
3007 fragment,
3008 invalidDiamondArgs.size() > 1 ?
3009 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3010 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3011 }
3012 // For <>(){}, inferred types must also be accessible.
3013 for (Type t : clazztype.getTypeArguments()) {
3014 rs.checkAccessibleType(env, t);
3015 }
3016 }
3017
3018 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3019 // false for isInterface call even when the original type is an interface.
3020 boolean implementing = clazztype.tsym.isInterface() ||
3021 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3022 clazztype.getOriginalType().tsym.isInterface();
3023
3024 if (implementing) {
3025 cdef.implementing = List.of(clazz);
3026 } else {
3027 cdef.extending = clazz;
3028 }
3029
3030 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3031 rs.isSerializable(clazztype)) {
3032 localEnv.info.isSerializable = true;
3033 }
3034
3035 attribStat(cdef, localEnv);
3036
3037 List<Type> finalargtypes;
3038 // If an outer instance is given,
3039 // prefix it to the constructor arguments
3040 // and delete it from the new expression
3041 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3042 finalargtypes = argtypes.prepend(tree.encl.type);
3043 } else {
3044 finalargtypes = argtypes;
3045 }
3046
3047 // Reassign clazztype and recompute constructor. As this necessarily involves
3048 // another attribution pass for deferred types in the case of <>, replicate
3049 // them. Original arguments have right decorations already.
3050 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3051 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3052 }
3053
3054 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3055 : cdef.sym.type;
3056 Symbol sym = tree.constructor = rs.resolveConstructor(
3057 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3058 Assert.check(!sym.kind.isResolutionError());
3059 tree.constructor = sym;
3060 tree.constructorType = checkId(tree,
3061 clazztype,
3062 tree.constructor,
3063 localEnv,
3064 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3065 }
3066 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3067 clazztype : types.createErrorType(tree.type);
3068 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3069 chk.validate(tree.typeargs, localEnv);
3070 }
3071
3072 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3073 return new Check.NestedCheckContext(checkContext) {
3074 @Override
3075 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3076 enclosingContext.report(clazz.clazz,
3077 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3078 }
3079 };
3080 }
3081
3082 /** Make an attributed null check tree.
3083 */
3084 public JCExpression makeNullCheck(JCExpression arg) {
3085 // optimization: new Outer() can never be null; skip null check
3086 if (arg.getTag() == NEWCLASS)
3087 return arg;
3088 // optimization: X.this is never null; skip null check
3089 Name name = TreeInfo.name(arg);
3090 if (name == names._this || name == names._super) return arg;
3091
3092 JCTree.Tag optag = NULLCHK;
3093 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3094 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3095 tree.type = arg.type;
3096 return tree;
3097 }
3098
3099 public void visitNewArray(JCNewArray tree) {
3100 Type owntype = types.createErrorType(tree.type);
3101 Env<AttrContext> localEnv = env.dup(tree);
3102 Type elemtype;
3103 if (tree.elemtype != null) {
3104 elemtype = attribType(tree.elemtype, localEnv);
3105 chk.validate(tree.elemtype, localEnv);
3106 owntype = elemtype;
3107 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3108 attribExpr(l.head, localEnv, syms.intType);
3109 owntype = new ArrayType(owntype, syms.arrayClass);
3110 }
3111 } else {
3112 // we are seeing an untyped aggregate { ... }
3113 // this is allowed only if the prototype is an array
3114 if (pt().hasTag(ARRAY)) {
3115 elemtype = types.elemtype(pt());
3116 } else {
3117 if (!pt().hasTag(ERROR) &&
3118 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3119 log.error(tree.pos(),
3120 Errors.IllegalInitializerForType(pt()));
3121 }
3122 elemtype = types.createErrorType(pt());
3123 }
3124 }
3125 if (tree.elems != null) {
3126 attribExprs(tree.elems, localEnv, elemtype);
3127 owntype = new ArrayType(elemtype, syms.arrayClass);
3128 }
3129 if (!types.isReifiable(elemtype))
3130 log.error(tree.pos(), Errors.GenericArrayCreation);
3131 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3132 }
3133
3134 /*
3135 * A lambda expression can only be attributed when a target-type is available.
3136 * In addition, if the target-type is that of a functional interface whose
3137 * descriptor contains inference variables in argument position the lambda expression
3138 * is 'stuck' (see DeferredAttr).
3139 */
3140 @Override
3141 public void visitLambda(final JCLambda that) {
3142 boolean wrongContext = false;
3143 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3144 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3145 //lambda only allowed in assignment or method invocation/cast context
3146 log.error(that.pos(), Errors.UnexpectedLambda);
3147 }
3148 resultInfo = recoveryInfo;
3149 wrongContext = true;
3150 }
3151 //create an environment for attribution of the lambda expression
3152 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3153 boolean needsRecovery =
3154 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3155 try {
3156 if (needsRecovery && rs.isSerializable(pt())) {
3157 localEnv.info.isSerializable = true;
3158 localEnv.info.isSerializableLambda = true;
3159 }
3160 List<Type> explicitParamTypes = null;
3161 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3162 //attribute lambda parameters
3163 attribStats(that.params, localEnv);
3164 explicitParamTypes = TreeInfo.types(that.params);
3165 }
3166
3167 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3168 Type currentTarget = targetInfo.target;
3169 Type lambdaType = targetInfo.descriptor;
3170
3171 if (currentTarget.isErroneous()) {
3172 result = that.type = currentTarget;
3173 return;
3174 }
3175
3176 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3177
3178 if (lambdaType.hasTag(FORALL)) {
3179 //lambda expression target desc cannot be a generic method
3180 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3181 kindName(currentTarget.tsym),
3182 currentTarget.tsym);
3183 resultInfo.checkContext.report(that, diags.fragment(msg));
3184 result = that.type = types.createErrorType(pt());
3185 return;
3186 }
3187
3188 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3189 //add param type info in the AST
3190 List<Type> actuals = lambdaType.getParameterTypes();
3191 List<JCVariableDecl> params = that.params;
3192
3193 boolean arityMismatch = false;
3194
3195 while (params.nonEmpty()) {
3196 if (actuals.isEmpty()) {
3197 //not enough actuals to perform lambda parameter inference
3198 arityMismatch = true;
3199 }
3200 //reset previously set info
3201 Type argType = arityMismatch ?
3202 syms.errType :
3203 actuals.head;
3204 if (params.head.isImplicitlyTyped()) {
3205 setSyntheticVariableType(params.head, argType);
3206 }
3207 params.head.sym = null;
3208 actuals = actuals.isEmpty() ?
3209 actuals :
3210 actuals.tail;
3211 params = params.tail;
3212 }
3213
3214 //attribute lambda parameters
3215 attribStats(that.params, localEnv);
3216
3217 if (arityMismatch) {
3218 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3219 result = that.type = types.createErrorType(currentTarget);
3220 return;
3221 }
3222 }
3223
3224 //from this point on, no recovery is needed; if we are in assignment context
3225 //we will be able to attribute the whole lambda body, regardless of errors;
3226 //if we are in a 'check' method context, and the lambda is not compatible
3227 //with the target-type, it will be recovered anyway in Attr.checkId
3228 needsRecovery = false;
3229
3230 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3231 lambdaBodyResult(that, lambdaType, resultInfo);
3232
3233 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3234 attribTree(that.getBody(), localEnv, bodyResultInfo);
3235 } else {
3236 JCBlock body = (JCBlock)that.body;
3237 if (body == breakTree &&
3238 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3239 breakTreeFound(copyEnv(localEnv));
3240 }
3241 attribStats(body.stats, localEnv);
3242 }
3243
3244 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3245
3246 boolean isSpeculativeRound =
3247 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3248
3249 preFlow(that);
3250 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3251
3252 that.type = currentTarget; //avoids recovery at this stage
3253 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3254
3255 if (!isSpeculativeRound) {
3256 //add thrown types as bounds to the thrown types free variables if needed:
3257 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3258 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3259 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3260 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3261 }
3262 }
3263
3264 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3265 }
3266 result = wrongContext ? that.type = types.createErrorType(pt())
3267 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3268 } catch (Types.FunctionDescriptorLookupError ex) {
3269 JCDiagnostic cause = ex.getDiagnostic();
3270 resultInfo.checkContext.report(that, cause);
3271 result = that.type = types.createErrorType(pt());
3272 return;
3273 } catch (CompletionFailure cf) {
3274 chk.completionError(that.pos(), cf);
3275 } catch (Throwable t) {
3276 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3277 //as that would likely cause the same exception again.
3278 needsRecovery = false;
3279 throw t;
3280 } finally {
3281 localEnv.info.scope.leave();
3282 if (needsRecovery) {
3283 Type prevResult = result;
3284 try {
3285 attribTree(that, env, recoveryInfo);
3286 } finally {
3287 if (result == Type.recoveryType) {
3288 result = prevResult;
3289 }
3290 }
3291 }
3292 }
3293 }
3294 //where
3295 class TargetInfo {
3296 Type target;
3297 Type descriptor;
3298
3299 public TargetInfo(Type target, Type descriptor) {
3300 this.target = target;
3301 this.descriptor = descriptor;
3302 }
3303 }
3304
3305 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3306 Type lambdaType;
3307 Type currentTarget = resultInfo.pt;
3308 if (resultInfo.pt != Type.recoveryType) {
3309 /* We need to adjust the target. If the target is an
3310 * intersection type, for example: SAM & I1 & I2 ...
3311 * the target will be updated to SAM
3312 */
3313 currentTarget = targetChecker.visit(currentTarget, that);
3314 if (!currentTarget.isIntersection()) {
3315 if (explicitParamTypes != null) {
3316 currentTarget = infer.instantiateFunctionalInterface(that,
3317 currentTarget, explicitParamTypes, resultInfo.checkContext);
3318 }
3319 currentTarget = types.removeWildcards(currentTarget);
3320 lambdaType = types.findDescriptorType(currentTarget);
3321 } else {
3322 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3323 ListBuffer<Type> components = new ListBuffer<>();
3324 for (Type bound : ict.getExplicitComponents()) {
3325 if (explicitParamTypes != null) {
3326 try {
3327 bound = infer.instantiateFunctionalInterface(that,
3328 bound, explicitParamTypes, resultInfo.checkContext);
3329 } catch (FunctionDescriptorLookupError t) {
3330 // do nothing
3331 }
3332 }
3333 bound = types.removeWildcards(bound);
3334 components.add(bound);
3335 }
3336 currentTarget = types.makeIntersectionType(components.toList());
3337 currentTarget.tsym.flags_field |= INTERFACE;
3338 lambdaType = types.findDescriptorType(currentTarget);
3339 }
3340
3341 } else {
3342 currentTarget = Type.recoveryType;
3343 lambdaType = fallbackDescriptorType(that);
3344 }
3345 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3346 //lambda expression target desc cannot be a generic method
3347 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3348 kindName(currentTarget.tsym),
3349 currentTarget.tsym);
3350 resultInfo.checkContext.report(that, diags.fragment(msg));
3351 currentTarget = types.createErrorType(pt());
3352 }
3353 return new TargetInfo(currentTarget, lambdaType);
3354 }
3355
3356 void preFlow(JCLambda tree) {
3357 attrRecover.doRecovery();
3358 new PostAttrAnalyzer() {
3359 @Override
3360 public void scan(JCTree tree) {
3361 if (tree == null ||
3362 (tree.type != null &&
3363 tree.type == Type.stuckType)) {
3364 //don't touch stuck expressions!
3365 return;
3366 }
3367 super.scan(tree);
3368 }
3369
3370 @Override
3371 public void visitClassDef(JCClassDecl that) {
3372 // or class declaration trees!
3373 }
3374
3375 public void visitLambda(JCLambda that) {
3376 // or lambda expressions!
3377 }
3378 }.scan(tree.body);
3379 }
3380
3381 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3382
3383 @Override
3384 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3385 return t.isIntersection() ?
3386 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3387 }
3388
3389 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3390 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3391 return ict;
3392 }
3393
3394 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3395 ListBuffer<Type> targs = new ListBuffer<>();
3396 ListBuffer<Type> supertypes = new ListBuffer<>();
3397 for (Type i : ict.interfaces_field) {
3398 if (i.isParameterized()) {
3399 targs.appendList(i.tsym.type.allparams());
3400 }
3401 supertypes.append(i.tsym.type);
3402 }
3403 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3404 notionalIntf.allparams_field = targs.toList();
3405 notionalIntf.tsym.flags_field |= INTERFACE;
3406 return notionalIntf.tsym;
3407 }
3408 };
3409
3410 private Type fallbackDescriptorType(JCExpression tree) {
3411 switch (tree.getTag()) {
3412 case LAMBDA:
3413 JCLambda lambda = (JCLambda)tree;
3414 List<Type> argtypes = List.nil();
3415 for (JCVariableDecl param : lambda.params) {
3416 argtypes = param.vartype != null && param.vartype.type != null ?
3417 argtypes.append(param.vartype.type) :
3418 argtypes.append(syms.errType);
3419 }
3420 return new MethodType(argtypes, Type.recoveryType,
3421 List.of(syms.throwableType), syms.methodClass);
3422 case REFERENCE:
3423 return new MethodType(List.nil(), Type.recoveryType,
3424 List.of(syms.throwableType), syms.methodClass);
3425 default:
3426 Assert.error("Cannot get here!");
3427 }
3428 return null;
3429 }
3430
3431 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3432 final InferenceContext inferenceContext, final Type... ts) {
3433 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3434 }
3435
3436 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3437 final InferenceContext inferenceContext, final List<Type> ts) {
3438 if (inferenceContext.free(ts)) {
3439 inferenceContext.addFreeTypeListener(ts,
3440 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3441 } else {
3442 for (Type t : ts) {
3443 rs.checkAccessibleType(env, t);
3444 }
3445 }
3446 }
3447
3448 /**
3449 * Lambda/method reference have a special check context that ensures
3450 * that i.e. a lambda return type is compatible with the expected
3451 * type according to both the inherited context and the assignment
3452 * context.
3453 */
3454 class FunctionalReturnContext extends Check.NestedCheckContext {
3455
3456 FunctionalReturnContext(CheckContext enclosingContext) {
3457 super(enclosingContext);
3458 }
3459
3460 @Override
3461 public boolean compatible(Type found, Type req, Warner warn) {
3462 //return type must be compatible in both current context and assignment context
3463 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3464 }
3465
3466 @Override
3467 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3468 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3469 }
3470 }
3471
3472 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3473
3474 JCExpression expr;
3475 boolean expStmtExpected;
3476
3477 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3478 super(enclosingContext);
3479 this.expr = expr;
3480 }
3481
3482 @Override
3483 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3484 if (expStmtExpected) {
3485 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3486 } else {
3487 super.report(pos, details);
3488 }
3489 }
3490
3491 @Override
3492 public boolean compatible(Type found, Type req, Warner warn) {
3493 //a void return is compatible with an expression statement lambda
3494 if (req.hasTag(VOID)) {
3495 expStmtExpected = true;
3496 return TreeInfo.isExpressionStatement(expr);
3497 } else {
3498 return super.compatible(found, req, warn);
3499 }
3500 }
3501 }
3502
3503 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3504 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3505 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3506 new FunctionalReturnContext(resultInfo.checkContext);
3507
3508 return descriptor.getReturnType() == Type.recoveryType ?
3509 recoveryInfo :
3510 new ResultInfo(KindSelector.VAL,
3511 descriptor.getReturnType(), funcContext);
3512 }
3513
3514 /**
3515 * Lambda compatibility. Check that given return types, thrown types, parameter types
3516 * are compatible with the expected functional interface descriptor. This means that:
3517 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3518 * types must be compatible with the return type of the expected descriptor.
3519 */
3520 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3521 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3522
3523 //return values have already been checked - but if lambda has no return
3524 //values, we must ensure that void/value compatibility is correct;
3525 //this amounts at checking that, if a lambda body can complete normally,
3526 //the descriptor's return type must be void
3527 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3528 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3529 Fragment msg =
3530 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3531 checkContext.report(tree,
3532 diags.fragment(msg));
3533 }
3534
3535 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3536 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3537 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3538 }
3539 }
3540
3541 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3542 * static field and that lambda has type annotations, these annotations will
3543 * also be stored at these fake clinit methods.
3544 *
3545 * LambdaToMethod also use fake clinit methods so they can be reused.
3546 * Also as LTM is a phase subsequent to attribution, the methods from
3547 * clinits can be safely removed by LTM to save memory.
3548 */
3549 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3550
3551 public MethodSymbol removeClinit(ClassSymbol sym) {
3552 return clinits.remove(sym);
3553 }
3554
3555 /* This method returns an environment to be used to attribute a lambda
3556 * expression.
3557 *
3558 * The owner of this environment is a method symbol. If the current owner
3559 * is not a method, for example if the lambda is used to initialize
3560 * a field, then if the field is:
3561 *
3562 * - an instance field, we use the first constructor.
3563 * - a static field, we create a fake clinit method.
3564 */
3565 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3566 Env<AttrContext> lambdaEnv;
3567 Symbol owner = env.info.scope.owner;
3568 if (owner.kind == VAR && owner.owner.kind == TYP) {
3569 //field initializer
3570 ClassSymbol enclClass = owner.enclClass();
3571 Symbol newScopeOwner = env.info.scope.owner;
3572 /* if the field isn't static, then we can get the first constructor
3573 * and use it as the owner of the environment. This is what
3574 * LTM code is doing to look for type annotations so we are fine.
3575 */
3576 if ((owner.flags() & STATIC) == 0) {
3577 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3578 newScopeOwner = s;
3579 break;
3580 }
3581 } else {
3582 /* if the field is static then we need to create a fake clinit
3583 * method, this method can later be reused by LTM.
3584 */
3585 MethodSymbol clinit = clinits.get(enclClass);
3586 if (clinit == null) {
3587 Type clinitType = new MethodType(List.nil(),
3588 syms.voidType, List.nil(), syms.methodClass);
3589 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3590 names.clinit, clinitType, enclClass);
3591 clinit.params = List.nil();
3592 clinits.put(enclClass, clinit);
3593 }
3594 newScopeOwner = clinit;
3595 }
3596 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3597 } else {
3598 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3599 }
3600 lambdaEnv.info.yieldResult = null;
3601 lambdaEnv.info.isLambda = true;
3602 return lambdaEnv;
3603 }
3604
3605 @Override
3606 public void visitReference(final JCMemberReference that) {
3607 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3608 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3609 //method reference only allowed in assignment or method invocation/cast context
3610 log.error(that.pos(), Errors.UnexpectedMref);
3611 }
3612 result = that.type = types.createErrorType(pt());
3613 return;
3614 }
3615 final Env<AttrContext> localEnv = env.dup(that);
3616 try {
3617 //attribute member reference qualifier - if this is a constructor
3618 //reference, the expected kind must be a type
3619 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3620
3621 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3622 exprType = chk.checkConstructorRefType(that.expr, exprType);
3623 if (!exprType.isErroneous() &&
3624 exprType.isRaw() &&
3625 that.typeargs != null) {
3626 log.error(that.expr.pos(),
3627 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3628 Fragments.MrefInferAndExplicitParams));
3629 exprType = types.createErrorType(exprType);
3630 }
3631 }
3632
3633 if (exprType.isErroneous()) {
3634 //if the qualifier expression contains problems,
3635 //give up attribution of method reference
3636 result = that.type = exprType;
3637 return;
3638 }
3639
3640 if (TreeInfo.isStaticSelector(that.expr, names)) {
3641 //if the qualifier is a type, validate it; raw warning check is
3642 //omitted as we don't know at this stage as to whether this is a
3643 //raw selector (because of inference)
3644 chk.validate(that.expr, env, false);
3645 } else {
3646 Symbol lhsSym = TreeInfo.symbol(that.expr);
3647 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3648 }
3649 //attrib type-arguments
3650 List<Type> typeargtypes = List.nil();
3651 if (that.typeargs != null) {
3652 typeargtypes = attribTypes(that.typeargs, localEnv);
3653 }
3654
3655 boolean isTargetSerializable =
3656 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3657 rs.isSerializable(pt());
3658 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3659 Type currentTarget = targetInfo.target;
3660 Type desc = targetInfo.descriptor;
3661
3662 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3663 List<Type> argtypes = desc.getParameterTypes();
3664 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3665
3666 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3667 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3668 }
3669
3670 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3671 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3672 try {
3673 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3674 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3675 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3676 } finally {
3677 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3678 }
3679
3680 Symbol refSym = refResult.fst;
3681 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3682
3683 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3684 * JDK-8075541
3685 */
3686 if (refSym.kind != MTH) {
3687 boolean targetError;
3688 switch (refSym.kind) {
3689 case ABSENT_MTH:
3690 case MISSING_ENCL:
3691 targetError = false;
3692 break;
3693 case WRONG_MTH:
3694 case WRONG_MTHS:
3695 case AMBIGUOUS:
3696 case HIDDEN:
3697 case STATICERR:
3698 targetError = true;
3699 break;
3700 default:
3701 Assert.error("unexpected result kind " + refSym.kind);
3702 targetError = false;
3703 }
3704
3705 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3706 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3707 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3708
3709 JCDiagnostic diag = diags.create(log.currentSource(), that,
3710 targetError ?
3711 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3712 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3713
3714 if (targetError && currentTarget == Type.recoveryType) {
3715 //a target error doesn't make sense during recovery stage
3716 //as we don't know what actual parameter types are
3717 result = that.type = currentTarget;
3718 return;
3719 } else {
3720 if (targetError) {
3721 resultInfo.checkContext.report(that, diag);
3722 } else {
3723 log.report(diag);
3724 }
3725 result = that.type = types.createErrorType(currentTarget);
3726 return;
3727 }
3728 }
3729
3730 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3731 that.kind = lookupHelper.referenceKind(that.sym);
3732 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3733
3734 if (desc.getReturnType() == Type.recoveryType) {
3735 // stop here
3736 result = that.type = currentTarget;
3737 return;
3738 }
3739
3740 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3741 Type enclosingType = exprType.getEnclosingType();
3742 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3743 // Check for the existence of an appropriate outer instance
3744 rs.resolveImplicitThis(that.pos(), env, exprType);
3745 }
3746 }
3747
3748 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3749
3750 if (that.getMode() == ReferenceMode.INVOKE &&
3751 TreeInfo.isStaticSelector(that.expr, names) &&
3752 that.kind.isUnbound() &&
3753 lookupHelper.site.isRaw()) {
3754 chk.checkRaw(that.expr, localEnv);
3755 }
3756
3757 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3758 exprType.getTypeArguments().nonEmpty()) {
3759 //static ref with class type-args
3760 log.error(that.expr.pos(),
3761 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3762 Fragments.StaticMrefWithTargs));
3763 result = that.type = types.createErrorType(currentTarget);
3764 return;
3765 }
3766
3767 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3768 // Check that super-qualified symbols are not abstract (JLS)
3769 rs.checkNonAbstract(that.pos(), that.sym);
3770 }
3771
3772 if (isTargetSerializable) {
3773 chk.checkAccessFromSerializableElement(that, true);
3774 }
3775 }
3776
3777 ResultInfo checkInfo =
3778 resultInfo.dup(newMethodTemplate(
3779 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3780 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3781 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3782
3783 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3784
3785 if (that.kind.isUnbound() &&
3786 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3787 //re-generate inference constraints for unbound receiver
3788 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3789 //cannot happen as this has already been checked - we just need
3790 //to regenerate the inference constraints, as that has been lost
3791 //as a result of the call to inferenceContext.save()
3792 Assert.error("Can't get here");
3793 }
3794 }
3795
3796 if (!refType.isErroneous()) {
3797 refType = types.createMethodTypeWithReturn(refType,
3798 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3799 }
3800
3801 //go ahead with standard method reference compatibility check - note that param check
3802 //is a no-op (as this has been taken care during method applicability)
3803 boolean isSpeculativeRound =
3804 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3805
3806 that.type = currentTarget; //avoids recovery at this stage
3807 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3808 if (!isSpeculativeRound) {
3809 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3810 }
3811 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3812 } catch (Types.FunctionDescriptorLookupError ex) {
3813 JCDiagnostic cause = ex.getDiagnostic();
3814 resultInfo.checkContext.report(that, cause);
3815 result = that.type = types.createErrorType(pt());
3816 return;
3817 }
3818 }
3819 //where
3820 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3821 //if this is a constructor reference, the expected kind must be a type
3822 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3823 KindSelector.VAL_TYP : KindSelector.TYP,
3824 Type.noType);
3825 }
3826
3827
3828 @SuppressWarnings("fallthrough")
3829 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3830 InferenceContext inferenceContext = checkContext.inferenceContext();
3831 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3832
3833 Type resType;
3834 switch (tree.getMode()) {
3835 case NEW:
3836 if (!tree.expr.type.isRaw()) {
3837 resType = tree.expr.type;
3838 break;
3839 }
3840 default:
3841 resType = refType.getReturnType();
3842 }
3843
3844 Type incompatibleReturnType = resType;
3845
3846 if (returnType.hasTag(VOID)) {
3847 incompatibleReturnType = null;
3848 }
3849
3850 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3851 if (resType.isErroneous() ||
3852 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3853 checkContext.checkWarner(tree, resType, returnType))) {
3854 incompatibleReturnType = null;
3855 }
3856 }
3857
3858 if (incompatibleReturnType != null) {
3859 Fragment msg =
3860 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3861 checkContext.report(tree, diags.fragment(msg));
3862 } else {
3863 if (inferenceContext.free(refType)) {
3864 // we need to wait for inference to finish and then replace inference vars in the referent type
3865 inferenceContext.addFreeTypeListener(List.of(refType),
3866 instantiatedContext -> {
3867 tree.referentType = instantiatedContext.asInstType(refType);
3868 });
3869 } else {
3870 tree.referentType = refType;
3871 }
3872 }
3873
3874 if (!speculativeAttr) {
3875 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3876 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3877 }
3878 }
3879 }
3880
3881 boolean checkExConstraints(
3882 List<Type> thrownByFuncExpr,
3883 List<Type> thrownAtFuncType,
3884 InferenceContext inferenceContext) {
3885 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3886 * are not proper types
3887 */
3888 List<Type> nonProperList = thrownAtFuncType.stream()
3889 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3890 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3891
3892 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3893 * in the throws clause of the invocation type of the method reference's compile-time
3894 * declaration
3895 */
3896 List<Type> checkedList = thrownByFuncExpr.stream()
3897 .filter(e -> chk.isChecked(e)).collect(List.collector());
3898
3899 /** If n = 0 (the function type's throws clause consists only of proper types), then
3900 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3901 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3902 * reduces to true
3903 */
3904 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3905 for (Type checked : checkedList) {
3906 boolean isSubtype = false;
3907 for (Type proper : properList) {
3908 if (types.isSubtype(checked, proper)) {
3909 isSubtype = true;
3910 break;
3911 }
3912 }
3913 if (!isSubtype) {
3914 uncaughtByProperTypes.add(checked);
3915 }
3916 }
3917
3918 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3919 return false;
3920 }
3921
3922 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3923 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3924 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3925 */
3926 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3927 uncaughtByProperTypes.forEach(checkedEx -> {
3928 nonProperAsUndet.forEach(nonProper -> {
3929 types.isSubtype(checkedEx, nonProper);
3930 });
3931 });
3932
3933 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3934 */
3935 nonProperAsUndet.stream()
3936 .filter(t -> t.hasTag(UNDETVAR))
3937 .forEach(t -> ((UndetVar)t).setThrow());
3938 return true;
3939 }
3940
3941 /**
3942 * Set functional type info on the underlying AST. Note: as the target descriptor
3943 * might contain inference variables, we might need to register an hook in the
3944 * current inference context.
3945 */
3946 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3947 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3948 if (checkContext.inferenceContext().free(descriptorType)) {
3949 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3950 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3951 inferenceContext.asInstType(primaryTarget), checkContext));
3952 } else {
3953 if (pt.hasTag(CLASS)) {
3954 fExpr.target = primaryTarget;
3955 }
3956 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3957 pt != Type.recoveryType) {
3958 //check that functional interface class is well-formed
3959 try {
3960 /* Types.makeFunctionalInterfaceClass() may throw an exception
3961 * when it's executed post-inference. See the listener code
3962 * above.
3963 */
3964 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3965 names.empty, fExpr.target, ABSTRACT);
3966 if (csym != null) {
3967 chk.checkImplementations(env.tree, csym, csym);
3968 try {
3969 //perform an additional functional interface check on the synthetic class,
3970 //as there may be spurious errors for raw targets - because of existing issues
3971 //with membership and inheritance (see JDK-8074570).
3972 csym.flags_field |= INTERFACE;
3973 types.findDescriptorType(csym.type);
3974 } catch (FunctionDescriptorLookupError err) {
3975 resultInfo.checkContext.report(fExpr,
3976 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3977 }
3978 }
3979 } catch (Types.FunctionDescriptorLookupError ex) {
3980 JCDiagnostic cause = ex.getDiagnostic();
3981 resultInfo.checkContext.report(env.tree, cause);
3982 }
3983 }
3984 }
3985 }
3986
3987 public void visitParens(JCParens tree) {
3988 Type owntype = attribTree(tree.expr, env, resultInfo);
3989 result = check(tree, owntype, pkind(), resultInfo);
3990 Symbol sym = TreeInfo.symbol(tree);
3991 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3992 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3993 }
3994
3995 public void visitAssign(JCAssign tree) {
3996 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3997 Type capturedType = capture(owntype);
3998 attribExpr(tree.rhs, env, owntype);
3999 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4000 }
4001
4002 public void visitAssignop(JCAssignOp tree) {
4003 // Attribute arguments.
4004 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4005 Type operand = attribExpr(tree.rhs, env);
4006 // Find operator.
4007 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4008 if (operator != operators.noOpSymbol &&
4009 !owntype.isErroneous() &&
4010 !operand.isErroneous()) {
4011 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4012 chk.checkCastable(tree.rhs.pos(),
4013 operator.type.getReturnType(),
4014 owntype);
4015 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4016 }
4017 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4018 }
4019
4020 public void visitUnary(JCUnary tree) {
4021 // Attribute arguments.
4022 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4023 ? attribTree(tree.arg, env, varAssignmentInfo)
4024 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4025
4026 // Find operator.
4027 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4028 Type owntype = types.createErrorType(tree.type);
4029 if (operator != operators.noOpSymbol &&
4030 !argtype.isErroneous()) {
4031 owntype = (tree.getTag().isIncOrDecUnaryOp())
4032 ? tree.arg.type
4033 : operator.type.getReturnType();
4034 int opc = operator.opcode;
4035
4036 // If the argument is constant, fold it.
4037 if (argtype.constValue() != null) {
4038 Type ctype = cfolder.fold1(opc, argtype);
4039 if (ctype != null) {
4040 owntype = cfolder.coerce(ctype, owntype);
4041 }
4042 }
4043 }
4044 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4045 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4046 }
4047
4048 public void visitBinary(JCBinary tree) {
4049 // Attribute arguments.
4050 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4051 // x && y
4052 // include x's bindings when true in y
4053
4054 // x || y
4055 // include x's bindings when false in y
4056
4057 MatchBindings lhsBindings = matchBindings;
4058 List<BindingSymbol> propagatedBindings;
4059 switch (tree.getTag()) {
4060 case AND:
4061 propagatedBindings = lhsBindings.bindingsWhenTrue;
4062 break;
4063 case OR:
4064 propagatedBindings = lhsBindings.bindingsWhenFalse;
4065 break;
4066 default:
4067 propagatedBindings = List.nil();
4068 break;
4069 }
4070 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4071 Type right;
4072 try {
4073 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4074 } finally {
4075 rhsEnv.info.scope.leave();
4076 }
4077
4078 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4079
4080 // Find operator.
4081 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4082 Type owntype = types.createErrorType(tree.type);
4083 if (operator != operators.noOpSymbol &&
4084 !left.isErroneous() &&
4085 !right.isErroneous()) {
4086 owntype = operator.type.getReturnType();
4087 int opc = operator.opcode;
4088 // If both arguments are constants, fold them.
4089 if (left.constValue() != null && right.constValue() != null) {
4090 Type ctype = cfolder.fold2(opc, left, right);
4091 if (ctype != null) {
4092 owntype = cfolder.coerce(ctype, owntype);
4093 }
4094 }
4095
4096 // Check that argument types of a reference ==, != are
4097 // castable to each other, (JLS 15.21). Note: unboxing
4098 // comparisons will not have an acmp* opc at this point.
4099 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4100 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4101 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4102 }
4103 }
4104
4105 chk.checkDivZero(tree.rhs.pos(), operator, right);
4106 }
4107 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4108 }
4109
4110 public void visitTypeCast(final JCTypeCast tree) {
4111 Type clazztype = attribType(tree.clazz, env);
4112 chk.validate(tree.clazz, env, false);
4113 //a fresh environment is required for 292 inference to work properly ---
4114 //see Infer.instantiatePolymorphicSignatureInstance()
4115 Env<AttrContext> localEnv = env.dup(tree);
4116 //should we propagate the target type?
4117 final ResultInfo castInfo;
4118 JCExpression expr = TreeInfo.skipParens(tree.expr);
4119 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4120 if (isPoly) {
4121 //expression is a poly - we need to propagate target type info
4122 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4123 new Check.NestedCheckContext(resultInfo.checkContext) {
4124 @Override
4125 public boolean compatible(Type found, Type req, Warner warn) {
4126 return types.isCastable(found, req, warn);
4127 }
4128 });
4129 } else {
4130 //standalone cast - target-type info is not propagated
4131 castInfo = unknownExprInfo;
4132 }
4133 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4134 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4135 if (exprtype.constValue() != null)
4136 owntype = cfolder.coerce(exprtype, owntype);
4137 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4138 if (!isPoly)
4139 chk.checkRedundantCast(localEnv, tree);
4140 }
4141
4142 public void visitTypeTest(JCInstanceOf tree) {
4143 Type exprtype = attribExpr(tree.expr, env);
4144 if (exprtype.isPrimitive()) {
4145 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4146 } else {
4147 exprtype = chk.checkNullOrRefType(
4148 tree.expr.pos(), exprtype);
4149 }
4150 Type clazztype;
4151 JCTree typeTree;
4152 if (tree.pattern.getTag() == BINDINGPATTERN ||
4153 tree.pattern.getTag() == RECORDPATTERN) {
4154 attribExpr(tree.pattern, env, exprtype);
4155 clazztype = tree.pattern.type;
4156 if (types.isSubtype(exprtype, clazztype) &&
4157 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4158 tree.pattern.getTag() != RECORDPATTERN) {
4159 if (!allowUnconditionalPatternsInstanceOf) {
4160 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4161 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4162 }
4163 }
4164 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4165 } else {
4166 clazztype = attribType(tree.pattern, env);
4167 typeTree = tree.pattern;
4168 chk.validate(typeTree, env, false);
4169 }
4170 if (clazztype.isPrimitive()) {
4171 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4172 } else {
4173 if (!clazztype.hasTag(TYPEVAR)) {
4174 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4175 }
4176 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4177 boolean valid = false;
4178 if (allowReifiableTypesInInstanceof) {
4179 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4180 } else {
4181 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4182 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4183 allowReifiableTypesInInstanceof = true;
4184 }
4185 if (!valid) {
4186 clazztype = types.createErrorType(clazztype);
4187 }
4188 }
4189 }
4190 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4191 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4192 }
4193
4194 private boolean checkCastablePattern(DiagnosticPosition pos,
4195 Type exprType,
4196 Type pattType) {
4197 Warner warner = new Warner();
4198 // if any type is erroneous, the problem is reported elsewhere
4199 if (exprType.isErroneous() || pattType.isErroneous()) {
4200 return false;
4201 }
4202 if (!types.isCastable(exprType, pattType, warner)) {
4203 chk.basicHandler.report(pos,
4204 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4205 return false;
4206 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4207 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4208 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4209 return true;
4210 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4211 log.error(pos,
4212 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4213 return false;
4214 } else {
4215 return true;
4216 }
4217 }
4218
4219 @Override
4220 public void visitAnyPattern(JCAnyPattern tree) {
4221 result = tree.type = resultInfo.pt;
4222 }
4223
4224 public void visitBindingPattern(JCBindingPattern tree) {
4225 Type type;
4226 if (tree.var.vartype != null) {
4227 type = attribType(tree.var.vartype, env);
4228 } else {
4229 type = resultInfo.pt;
4230 }
4231 tree.type = tree.var.type = type;
4232 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4233 v.pos = tree.pos;
4234 tree.var.sym = v;
4235 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4236 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4237 }
4238 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4239 if (!tree.var.isImplicitlyTyped()) {
4240 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4241 }
4242 annotate.flush();
4243 chk.validate(tree.var.vartype, env, true);
4244 result = tree.type;
4245 if (v.isUnnamedVariable()) {
4246 matchBindings = MatchBindingsComputer.EMPTY;
4247 } else {
4248 matchBindings = new MatchBindings(List.of(v), List.nil());
4249 }
4250 }
4251
4252 @Override
4253 public void visitRecordPattern(JCRecordPattern tree) {
4254 Type site;
4255
4256 if (tree.deconstructor == null) {
4257 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4258 tree.record = syms.errSymbol;
4259 site = tree.type = types.createErrorType(tree.record.type);
4260 } else {
4261 Type type = attribType(tree.deconstructor, env);
4262 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4263 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4264 if (inferred == null) {
4265 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4266 } else {
4267 type = inferred;
4268 }
4269 }
4270 tree.type = tree.deconstructor.type = type;
4271 site = types.capture(tree.type);
4272 }
4273
4274 List<Type> expectedRecordTypes;
4275 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4276 ClassSymbol record = (ClassSymbol) site.tsym;
4277 expectedRecordTypes = record.getRecordComponents()
4278 .stream()
4279 .map(rc -> types.memberType(site, rc))
4280 .map(t -> types.upward(t, types.captures(t)).baseType())
4281 .collect(List.collector());
4282 tree.record = record;
4283 } else {
4284 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4285 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4286 .limit(tree.nested.size())
4287 .collect(List.collector());
4288 tree.record = syms.errSymbol;
4289 }
4290 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4291 List<Type> recordTypes = expectedRecordTypes;
4292 List<JCPattern> nestedPatterns = tree.nested;
4293 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4294 try {
4295 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4296 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4297 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4298 outBindings.addAll(matchBindings.bindingsWhenTrue);
4299 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4300 nestedPatterns = nestedPatterns.tail;
4301 recordTypes = recordTypes.tail;
4302 }
4303 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4304 while (nestedPatterns.nonEmpty()) {
4305 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4306 nestedPatterns = nestedPatterns.tail;
4307 }
4308 List<Type> nestedTypes =
4309 tree.nested.stream().map(p -> p.type).collect(List.collector());
4310 log.error(tree.pos(),
4311 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4312 nestedTypes));
4313 }
4314 } finally {
4315 localEnv.info.scope.leave();
4316 }
4317 chk.validate(tree.deconstructor, env, true);
4318 result = tree.type;
4319 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4320 }
4321
4322 public void visitIndexed(JCArrayAccess tree) {
4323 Type owntype = types.createErrorType(tree.type);
4324 Type atype = attribExpr(tree.indexed, env);
4325 attribExpr(tree.index, env, syms.intType);
4326 if (types.isArray(atype))
4327 owntype = types.elemtype(atype);
4328 else if (!atype.hasTag(ERROR))
4329 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4330 if (!pkind().contains(KindSelector.VAL))
4331 owntype = capture(owntype);
4332 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4333 }
4334
4335 public void visitIdent(JCIdent tree) {
4336 Symbol sym;
4337
4338 // Find symbol
4339 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4340 // If we are looking for a method, the prototype `pt' will be a
4341 // method type with the type of the call's arguments as parameters.
4342 env.info.pendingResolutionPhase = null;
4343 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4344 } else if (tree.sym != null && tree.sym.kind != VAR) {
4345 sym = tree.sym;
4346 } else {
4347 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4348 }
4349 tree.sym = sym;
4350
4351 // Also find the environment current for the class where
4352 // sym is defined (`symEnv').
4353 Env<AttrContext> symEnv = env;
4354 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4355 sym.kind.matches(KindSelector.VAL_MTH) &&
4356 sym.owner.kind == TYP &&
4357 tree.name != names._this && tree.name != names._super) {
4358
4359 // Find environment in which identifier is defined.
4360 while (symEnv.outer != null &&
4361 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4362 symEnv = symEnv.outer;
4363 }
4364 }
4365
4366 // If symbol is a variable, ...
4367 if (sym.kind == VAR) {
4368 VarSymbol v = (VarSymbol)sym;
4369
4370 // ..., evaluate its initializer, if it has one, and check for
4371 // illegal forward reference.
4372 checkInit(tree, env, v, false);
4373
4374 // If we are expecting a variable (as opposed to a value), check
4375 // that the variable is assignable in the current environment.
4376 if (KindSelector.ASG.subset(pkind()))
4377 checkAssignable(tree.pos(), v, null, env);
4378 }
4379
4380 Env<AttrContext> env1 = env;
4381 if (sym.kind != ERR && sym.kind != TYP &&
4382 sym.owner != null && sym.owner != env1.enclClass.sym) {
4383 // If the found symbol is inaccessible, then it is
4384 // accessed through an enclosing instance. Locate this
4385 // enclosing instance:
4386 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4387 env1 = env1.outer;
4388 }
4389
4390 if (env.info.isSerializable) {
4391 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4392 }
4393
4394 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4395 }
4396
4397 public void visitSelect(JCFieldAccess tree) {
4398 // Determine the expected kind of the qualifier expression.
4399 KindSelector skind = KindSelector.NIL;
4400 if (tree.name == names._this || tree.name == names._super ||
4401 tree.name == names._class)
4402 {
4403 skind = KindSelector.TYP;
4404 } else {
4405 if (pkind().contains(KindSelector.PCK))
4406 skind = KindSelector.of(skind, KindSelector.PCK);
4407 if (pkind().contains(KindSelector.TYP))
4408 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4409 if (pkind().contains(KindSelector.VAL_MTH))
4410 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4411 }
4412
4413 // Attribute the qualifier expression, and determine its symbol (if any).
4414 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4415 Assert.check(site == tree.selected.type);
4416 if (!pkind().contains(KindSelector.TYP_PCK))
4417 site = capture(site); // Capture field access
4418
4419 // don't allow T.class T[].class, etc
4420 if (skind == KindSelector.TYP) {
4421 Type elt = site;
4422 while (elt.hasTag(ARRAY))
4423 elt = ((ArrayType)elt).elemtype;
4424 if (elt.hasTag(TYPEVAR)) {
4425 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4426 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4427 tree.sym = tree.type.tsym;
4428 return ;
4429 }
4430 }
4431
4432 // If qualifier symbol is a type or `super', assert `selectSuper'
4433 // for the selection. This is relevant for determining whether
4434 // protected symbols are accessible.
4435 Symbol sitesym = TreeInfo.symbol(tree.selected);
4436 boolean selectSuperPrev = env.info.selectSuper;
4437 env.info.selectSuper =
4438 sitesym != null &&
4439 sitesym.name == names._super;
4440
4441 // Determine the symbol represented by the selection.
4442 env.info.pendingResolutionPhase = null;
4443 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4444 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4445 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4446 sym = syms.errSymbol;
4447 }
4448 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4449 site = capture(site);
4450 sym = selectSym(tree, sitesym, site, env, resultInfo);
4451 }
4452 boolean varArgs = env.info.lastResolveVarargs();
4453 tree.sym = sym;
4454
4455 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4456 site = types.skipTypeVars(site, true);
4457 }
4458
4459 // If that symbol is a variable, ...
4460 if (sym.kind == VAR) {
4461 VarSymbol v = (VarSymbol)sym;
4462
4463 // ..., evaluate its initializer, if it has one, and check for
4464 // illegal forward reference.
4465 checkInit(tree, env, v, true);
4466
4467 // If we are expecting a variable (as opposed to a value), check
4468 // that the variable is assignable in the current environment.
4469 if (KindSelector.ASG.subset(pkind()))
4470 checkAssignable(tree.pos(), v, tree.selected, env);
4471 }
4472
4473 if (sitesym != null &&
4474 sitesym.kind == VAR &&
4475 ((VarSymbol)sitesym).isResourceVariable() &&
4476 sym.kind == MTH &&
4477 sym.name.equals(names.close) &&
4478 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4479 env.info.lint.isEnabled(LintCategory.TRY)) {
4480 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4481 }
4482
4483 // Disallow selecting a type from an expression
4484 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4485 tree.type = check(tree.selected, pt(),
4486 sitesym == null ?
4487 KindSelector.VAL : sitesym.kind.toSelector(),
4488 new ResultInfo(KindSelector.TYP_PCK, pt()));
4489 }
4490
4491 if (isType(sitesym)) {
4492 if (sym.name != names._this && sym.name != names._super) {
4493 // Check if type-qualified fields or methods are static (JLS)
4494 if ((sym.flags() & STATIC) == 0 &&
4495 sym.name != names._super &&
4496 (sym.kind == VAR || sym.kind == MTH)) {
4497 rs.accessBase(rs.new StaticError(sym),
4498 tree.pos(), site, sym.name, true);
4499 }
4500 }
4501 } else if (sym.kind != ERR &&
4502 (sym.flags() & STATIC) != 0 &&
4503 sym.name != names._class) {
4504 // If the qualified item is not a type and the selected item is static, report
4505 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4506 if (!sym.owner.isAnonymous()) {
4507 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4508 } else {
4509 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4510 }
4511 }
4512
4513 // If we are selecting an instance member via a `super', ...
4514 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4515
4516 // Check that super-qualified symbols are not abstract (JLS)
4517 rs.checkNonAbstract(tree.pos(), sym);
4518
4519 if (site.isRaw()) {
4520 // Determine argument types for site.
4521 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4522 if (site1 != null) site = site1;
4523 }
4524 }
4525
4526 if (env.info.isSerializable) {
4527 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4528 }
4529
4530 env.info.selectSuper = selectSuperPrev;
4531 result = checkId(tree, site, sym, env, resultInfo);
4532 }
4533 //where
4534 /** Determine symbol referenced by a Select expression,
4535 *
4536 * @param tree The select tree.
4537 * @param site The type of the selected expression,
4538 * @param env The current environment.
4539 * @param resultInfo The current result.
4540 */
4541 private Symbol selectSym(JCFieldAccess tree,
4542 Symbol location,
4543 Type site,
4544 Env<AttrContext> env,
4545 ResultInfo resultInfo) {
4546 DiagnosticPosition pos = tree.pos();
4547 Name name = tree.name;
4548 switch (site.getTag()) {
4549 case PACKAGE:
4550 return rs.accessBase(
4551 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4552 pos, location, site, name, true);
4553 case ARRAY:
4554 case CLASS:
4555 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4556 return rs.resolveQualifiedMethod(
4557 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4558 } else if (name == names._this || name == names._super) {
4559 return rs.resolveSelf(pos, env, site.tsym, name);
4560 } else if (name == names._class) {
4561 // In this case, we have already made sure in
4562 // visitSelect that qualifier expression is a type.
4563 return syms.getClassField(site, types);
4564 } else {
4565 // We are seeing a plain identifier as selector.
4566 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4567 sym = rs.accessBase(sym, pos, location, site, name, true);
4568 return sym;
4569 }
4570 case WILDCARD:
4571 throw new AssertionError(tree);
4572 case TYPEVAR:
4573 // Normally, site.getUpperBound() shouldn't be null.
4574 // It should only happen during memberEnter/attribBase
4575 // when determining the supertype which *must* be
4576 // done before attributing the type variables. In
4577 // other words, we are seeing this illegal program:
4578 // class B<T> extends A<T.foo> {}
4579 Symbol sym = (site.getUpperBound() != null)
4580 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4581 : null;
4582 if (sym == null) {
4583 log.error(pos, Errors.TypeVarCantBeDeref);
4584 return syms.errSymbol;
4585 } else {
4586 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4587 rs.new AccessError(env, site, sym) :
4588 sym;
4589 rs.accessBase(sym2, pos, location, site, name, true);
4590 return sym;
4591 }
4592 case ERROR:
4593 // preserve identifier names through errors
4594 return types.createErrorType(name, site.tsym, site).tsym;
4595 default:
4596 // The qualifier expression is of a primitive type -- only
4597 // .class is allowed for these.
4598 if (name == names._class) {
4599 // In this case, we have already made sure in Select that
4600 // qualifier expression is a type.
4601 return syms.getClassField(site, types);
4602 } else {
4603 log.error(pos, Errors.CantDeref(site));
4604 return syms.errSymbol;
4605 }
4606 }
4607 }
4608
4609 /** Determine type of identifier or select expression and check that
4610 * (1) the referenced symbol is not deprecated
4611 * (2) the symbol's type is safe (@see checkSafe)
4612 * (3) if symbol is a variable, check that its type and kind are
4613 * compatible with the prototype and protokind.
4614 * (4) if symbol is an instance field of a raw type,
4615 * which is being assigned to, issue an unchecked warning if its
4616 * type changes under erasure.
4617 * (5) if symbol is an instance method of a raw type, issue an
4618 * unchecked warning if its argument types change under erasure.
4619 * If checks succeed:
4620 * If symbol is a constant, return its constant type
4621 * else if symbol is a method, return its result type
4622 * otherwise return its type.
4623 * Otherwise return errType.
4624 *
4625 * @param tree The syntax tree representing the identifier
4626 * @param site If this is a select, the type of the selected
4627 * expression, otherwise the type of the current class.
4628 * @param sym The symbol representing the identifier.
4629 * @param env The current environment.
4630 * @param resultInfo The expected result
4631 */
4632 Type checkId(JCTree tree,
4633 Type site,
4634 Symbol sym,
4635 Env<AttrContext> env,
4636 ResultInfo resultInfo) {
4637 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4638 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4639 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4640 }
4641
4642 Type checkMethodIdInternal(JCTree tree,
4643 Type site,
4644 Symbol sym,
4645 Env<AttrContext> env,
4646 ResultInfo resultInfo) {
4647 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4648 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4649 } else {
4650 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4651 }
4652 }
4653
4654 Type checkIdInternal(JCTree tree,
4655 Type site,
4656 Symbol sym,
4657 Type pt,
4658 Env<AttrContext> env,
4659 ResultInfo resultInfo) {
4660 if (pt.isErroneous()) {
4661 return types.createErrorType(site);
4662 }
4663 Type owntype; // The computed type of this identifier occurrence.
4664 switch (sym.kind) {
4665 case TYP:
4666 // For types, the computed type equals the symbol's type,
4667 // except for two situations:
4668 owntype = sym.type;
4669 if (owntype.hasTag(CLASS)) {
4670 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4671 Type ownOuter = owntype.getEnclosingType();
4672
4673 // (a) If the symbol's type is parameterized, erase it
4674 // because no type parameters were given.
4675 // We recover generic outer type later in visitTypeApply.
4676 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4677 owntype = types.erasure(owntype);
4678 }
4679
4680 // (b) If the symbol's type is an inner class, then
4681 // we have to interpret its outer type as a superclass
4682 // of the site type. Example:
4683 //
4684 // class Tree<A> { class Visitor { ... } }
4685 // class PointTree extends Tree<Point> { ... }
4686 // ...PointTree.Visitor...
4687 //
4688 // Then the type of the last expression above is
4689 // Tree<Point>.Visitor.
4690 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4691 Type normOuter = site;
4692 if (normOuter.hasTag(CLASS)) {
4693 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4694 }
4695 if (normOuter == null) // perhaps from an import
4696 normOuter = types.erasure(ownOuter);
4697 if (normOuter != ownOuter)
4698 owntype = new ClassType(
4699 normOuter, List.nil(), owntype.tsym,
4700 owntype.getMetadata());
4701 }
4702 }
4703 break;
4704 case VAR:
4705 VarSymbol v = (VarSymbol)sym;
4706
4707 if (env.info.enclVar != null
4708 && v.type.hasTag(NONE)) {
4709 //self reference to implicitly typed variable declaration
4710 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4711 return tree.type = v.type = types.createErrorType(v.type);
4712 }
4713
4714 // Test (4): if symbol is an instance field of a raw type,
4715 // which is being assigned to, issue an unchecked warning if
4716 // its type changes under erasure.
4717 if (KindSelector.ASG.subset(pkind()) &&
4718 v.owner.kind == TYP &&
4719 (v.flags() & STATIC) == 0 &&
4720 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4721 Type s = types.asOuterSuper(site, v.owner);
4722 if (s != null &&
4723 s.isRaw() &&
4724 !types.isSameType(v.type, v.erasure(types))) {
4725 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4726 }
4727 }
4728 // The computed type of a variable is the type of the
4729 // variable symbol, taken as a member of the site type.
4730 owntype = (sym.owner.kind == TYP &&
4731 sym.name != names._this && sym.name != names._super)
4732 ? types.memberType(site, sym)
4733 : sym.type;
4734
4735 // If the variable is a constant, record constant value in
4736 // computed type.
4737 if (v.getConstValue() != null && isStaticReference(tree))
4738 owntype = owntype.constType(v.getConstValue());
4739
4740 if (resultInfo.pkind == KindSelector.VAL) {
4741 owntype = capture(owntype); // capture "names as expressions"
4742 }
4743 break;
4744 case MTH: {
4745 owntype = checkMethod(site, sym,
4746 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4747 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4748 resultInfo.pt.getTypeArguments());
4749 chk.checkRestricted(tree.pos(), sym);
4750 break;
4751 }
4752 case PCK: case ERR:
4753 owntype = sym.type;
4754 break;
4755 default:
4756 throw new AssertionError("unexpected kind: " + sym.kind +
4757 " in tree " + tree);
4758 }
4759
4760 // Emit a `deprecation' warning if symbol is deprecated.
4761 // (for constructors (but not for constructor references), the error
4762 // was given when the constructor was resolved)
4763
4764 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4765 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4766 chk.checkSunAPI(tree.pos(), sym);
4767 chk.checkProfile(tree.pos(), sym);
4768 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4769 }
4770
4771 // If symbol is a variable, check that its type and
4772 // kind are compatible with the prototype and protokind.
4773 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4774 }
4775
4776 /** Check that variable is initialized and evaluate the variable's
4777 * initializer, if not yet done. Also check that variable is not
4778 * referenced before it is defined.
4779 * @param tree The tree making up the variable reference.
4780 * @param env The current environment.
4781 * @param v The variable's symbol.
4782 */
4783 private void checkInit(JCTree tree,
4784 Env<AttrContext> env,
4785 VarSymbol v,
4786 boolean onlyWarning) {
4787 // A forward reference is diagnosed if the declaration position
4788 // of the variable is greater than the current tree position
4789 // and the tree and variable definition occur in the same class
4790 // definition. Note that writes don't count as references.
4791 // This check applies only to class and instance
4792 // variables. Local variables follow different scope rules,
4793 // and are subject to definite assignment checking.
4794 Env<AttrContext> initEnv = enclosingInitEnv(env);
4795 if (initEnv != null &&
4796 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4797 v.owner.kind == TYP &&
4798 v.owner == env.info.scope.owner.enclClass() &&
4799 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4800 (!env.tree.hasTag(ASSIGN) ||
4801 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4802 if (!onlyWarning || isStaticEnumField(v)) {
4803 Error errkey = (initEnv.info.enclVar == v) ?
4804 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4805 log.error(tree.pos(), errkey);
4806 } else if (useBeforeDeclarationWarning) {
4807 Warning warnkey = (initEnv.info.enclVar == v) ?
4808 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4809 log.warning(tree.pos(), warnkey);
4810 }
4811 }
4812
4813 v.getConstValue(); // ensure initializer is evaluated
4814
4815 checkEnumInitializer(tree, env, v);
4816 }
4817
4818 /**
4819 * Returns the enclosing init environment associated with this env (if any). An init env
4820 * can be either a field declaration env or a static/instance initializer env.
4821 */
4822 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4823 while (true) {
4824 switch (env.tree.getTag()) {
4825 case VARDEF:
4826 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4827 if (vdecl.sym.owner.kind == TYP) {
4828 //field
4829 return env;
4830 }
4831 break;
4832 case BLOCK:
4833 if (env.next.tree.hasTag(CLASSDEF)) {
4834 //instance/static initializer
4835 return env;
4836 }
4837 break;
4838 case METHODDEF:
4839 case CLASSDEF:
4840 case TOPLEVEL:
4841 return null;
4842 }
4843 Assert.checkNonNull(env.next);
4844 env = env.next;
4845 }
4846 }
4847
4848 /**
4849 * Check for illegal references to static members of enum. In
4850 * an enum type, constructors and initializers may not
4851 * reference its static members unless they are constant.
4852 *
4853 * @param tree The tree making up the variable reference.
4854 * @param env The current environment.
4855 * @param v The variable's symbol.
4856 * @jls 8.9 Enum Types
4857 */
4858 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4859 // JLS:
4860 //
4861 // "It is a compile-time error to reference a static field
4862 // of an enum type that is not a compile-time constant
4863 // (15.28) from constructors, instance initializer blocks,
4864 // or instance variable initializer expressions of that
4865 // type. It is a compile-time error for the constructors,
4866 // instance initializer blocks, or instance variable
4867 // initializer expressions of an enum constant e to refer
4868 // to itself or to an enum constant of the same type that
4869 // is declared to the right of e."
4870 if (isStaticEnumField(v)) {
4871 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4872
4873 if (enclClass == null || enclClass.owner == null)
4874 return;
4875
4876 // See if the enclosing class is the enum (or a
4877 // subclass thereof) declaring v. If not, this
4878 // reference is OK.
4879 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4880 return;
4881
4882 // If the reference isn't from an initializer, then
4883 // the reference is OK.
4884 if (!Resolve.isInitializer(env))
4885 return;
4886
4887 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4888 }
4889 }
4890
4891 /** Is the given symbol a static, non-constant field of an Enum?
4892 * Note: enum literals should not be regarded as such
4893 */
4894 private boolean isStaticEnumField(VarSymbol v) {
4895 return Flags.isEnum(v.owner) &&
4896 Flags.isStatic(v) &&
4897 !Flags.isConstant(v) &&
4898 v.name != names._class;
4899 }
4900
4901 /**
4902 * Check that method arguments conform to its instantiation.
4903 **/
4904 public Type checkMethod(Type site,
4905 final Symbol sym,
4906 ResultInfo resultInfo,
4907 Env<AttrContext> env,
4908 final List<JCExpression> argtrees,
4909 List<Type> argtypes,
4910 List<Type> typeargtypes) {
4911 // Test (5): if symbol is an instance method of a raw type, issue
4912 // an unchecked warning if its argument types change under erasure.
4913 if ((sym.flags() & STATIC) == 0 &&
4914 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4915 Type s = types.asOuterSuper(site, sym.owner);
4916 if (s != null && s.isRaw() &&
4917 !types.isSameTypes(sym.type.getParameterTypes(),
4918 sym.erasure(types).getParameterTypes())) {
4919 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4920 }
4921 }
4922
4923 if (env.info.defaultSuperCallSite != null) {
4924 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4925 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4926 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4927 List<MethodSymbol> icand_sup =
4928 types.interfaceCandidates(sup, (MethodSymbol)sym);
4929 if (icand_sup.nonEmpty() &&
4930 icand_sup.head != sym &&
4931 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4932 log.error(env.tree.pos(),
4933 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4934 break;
4935 }
4936 }
4937 env.info.defaultSuperCallSite = null;
4938 }
4939
4940 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4941 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4942 if (app.meth.hasTag(SELECT) &&
4943 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4944 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4945 }
4946 }
4947
4948 // Compute the identifier's instantiated type.
4949 // For methods, we need to compute the instance type by
4950 // Resolve.instantiate from the symbol's type as well as
4951 // any type arguments and value arguments.
4952 Warner noteWarner = new Warner();
4953 try {
4954 Type owntype = rs.checkMethod(
4955 env,
4956 site,
4957 sym,
4958 resultInfo,
4959 argtypes,
4960 typeargtypes,
4961 noteWarner);
4962
4963 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4964 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4965
4966 argtypes = argtypes.map(checkDeferredMap);
4967
4968 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4969 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4970 sym.name,
4971 rs.methodArguments(sym.type.getParameterTypes()),
4972 rs.methodArguments(argtypes.map(checkDeferredMap)),
4973 kindName(sym.location()),
4974 sym.location()));
4975 if (resultInfo.pt != Infer.anyPoly ||
4976 !owntype.hasTag(METHOD) ||
4977 !owntype.isPartial()) {
4978 //if this is not a partially inferred method type, erase return type. Otherwise,
4979 //erasure is carried out in PartiallyInferredMethodType.check().
4980 owntype = new MethodType(owntype.getParameterTypes(),
4981 types.erasure(owntype.getReturnType()),
4982 types.erasure(owntype.getThrownTypes()),
4983 syms.methodClass);
4984 }
4985 }
4986
4987 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4988 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4989 PolyKind.POLY : PolyKind.STANDALONE;
4990 TreeInfo.setPolyKind(env.tree, pkind);
4991
4992 return (resultInfo.pt == Infer.anyPoly) ?
4993 owntype :
4994 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4995 resultInfo.checkContext.inferenceContext());
4996 } catch (Infer.InferenceException ex) {
4997 //invalid target type - propagate exception outwards or report error
4998 //depending on the current check context
4999 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5000 return types.createErrorType(site);
5001 } catch (Resolve.InapplicableMethodException ex) {
5002 final JCDiagnostic diag = ex.getDiagnostic();
5003 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5004 @Override
5005 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5006 return new Pair<>(sym, diag);
5007 }
5008 };
5009 List<Type> argtypes2 = argtypes.map(
5010 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5011 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5012 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5013 log.report(errDiag);
5014 return types.createErrorType(site);
5015 }
5016 }
5017
5018 public void visitLiteral(JCLiteral tree) {
5019 result = check(tree, litType(tree.typetag).constType(tree.value),
5020 KindSelector.VAL, resultInfo);
5021 }
5022 //where
5023 /** Return the type of a literal with given type tag.
5024 */
5025 Type litType(TypeTag tag) {
5026 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5027 }
5028
5029 public void visitStringTemplate(JCStringTemplate tree) {
5030 JCExpression processor = tree.processor;
5031 Type processorType = attribTree(processor, env, new ResultInfo(KindSelector.VAL, Type.noType));
5032 chk.checkProcessorType(processor, processorType, env);
5033 Type processMethodType = getProcessMethodType(tree, processorType);
5034 tree.processMethodType = processMethodType;
5035 Type resultType = processMethodType.getReturnType();
5036
5037 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
5038
5039 for (JCExpression arg : tree.expressions) {
5040 chk.checkNonVoid(arg.pos(), attribExpr(arg, localEnv));
5041 }
5042
5043 tree.type = resultType;
5044 result = resultType;
5045 check(tree, resultType, KindSelector.VAL, resultInfo);
5046 }
5047
5048 private Type getProcessMethodType(JCStringTemplate tree, Type processorType) {
5049 MethodSymbol processSymbol = rs.resolveInternalMethod(tree.pos(),
5050 env, types.skipTypeVars(processorType, false),
5051 names.process, List.of(syms.stringTemplateType), List.nil());
5052 return types.memberType(processorType, processSymbol);
5053 }
5054
5055 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5056 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5057 }
5058
5059 public void visitTypeArray(JCArrayTypeTree tree) {
5060 Type etype = attribType(tree.elemtype, env);
5061 Type type = new ArrayType(etype, syms.arrayClass);
5062 result = check(tree, type, KindSelector.TYP, resultInfo);
5063 }
5064
5065 /** Visitor method for parameterized types.
5066 * Bound checking is left until later, since types are attributed
5067 * before supertype structure is completely known
5068 */
5069 public void visitTypeApply(JCTypeApply tree) {
5070 Type owntype = types.createErrorType(tree.type);
5071
5072 // Attribute functor part of application and make sure it's a class.
5073 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5074
5075 // Attribute type parameters
5076 List<Type> actuals = attribTypes(tree.arguments, env);
5077
5078 if (clazztype.hasTag(CLASS)) {
5079 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5080 if (actuals.isEmpty()) //diamond
5081 actuals = formals;
5082
5083 if (actuals.length() == formals.length()) {
5084 List<Type> a = actuals;
5085 List<Type> f = formals;
5086 while (a.nonEmpty()) {
5087 a.head = a.head.withTypeVar(f.head);
5088 a = a.tail;
5089 f = f.tail;
5090 }
5091 // Compute the proper generic outer
5092 Type clazzOuter = clazztype.getEnclosingType();
5093 if (clazzOuter.hasTag(CLASS)) {
5094 Type site;
5095 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5096 if (clazz.hasTag(IDENT)) {
5097 site = env.enclClass.sym.type;
5098 } else if (clazz.hasTag(SELECT)) {
5099 site = ((JCFieldAccess) clazz).selected.type;
5100 } else throw new AssertionError(""+tree);
5101 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5102 if (site.hasTag(CLASS))
5103 site = types.asOuterSuper(site, clazzOuter.tsym);
5104 if (site == null)
5105 site = types.erasure(clazzOuter);
5106 clazzOuter = site;
5107 }
5108 }
5109 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5110 clazztype.getMetadata());
5111 } else {
5112 if (formals.length() != 0) {
5113 log.error(tree.pos(),
5114 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5115 } else {
5116 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5117 }
5118 owntype = types.createErrorType(tree.type);
5119 }
5120 }
5121 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5122 }
5123
5124 public void visitTypeUnion(JCTypeUnion tree) {
5125 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5126 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5127 for (JCExpression typeTree : tree.alternatives) {
5128 Type ctype = attribType(typeTree, env);
5129 ctype = chk.checkType(typeTree.pos(),
5130 chk.checkClassType(typeTree.pos(), ctype),
5131 syms.throwableType);
5132 if (!ctype.isErroneous()) {
5133 //check that alternatives of a union type are pairwise
5134 //unrelated w.r.t. subtyping
5135 if (chk.intersects(ctype, multicatchTypes.toList())) {
5136 for (Type t : multicatchTypes) {
5137 boolean sub = types.isSubtype(ctype, t);
5138 boolean sup = types.isSubtype(t, ctype);
5139 if (sub || sup) {
5140 //assume 'a' <: 'b'
5141 Type a = sub ? ctype : t;
5142 Type b = sub ? t : ctype;
5143 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5144 }
5145 }
5146 }
5147 multicatchTypes.append(ctype);
5148 if (all_multicatchTypes != null)
5149 all_multicatchTypes.append(ctype);
5150 } else {
5151 if (all_multicatchTypes == null) {
5152 all_multicatchTypes = new ListBuffer<>();
5153 all_multicatchTypes.appendList(multicatchTypes);
5154 }
5155 all_multicatchTypes.append(ctype);
5156 }
5157 }
5158 Type t = check(tree, types.lub(multicatchTypes.toList()),
5159 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5160 if (t.hasTag(CLASS)) {
5161 List<Type> alternatives =
5162 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5163 t = new UnionClassType((ClassType) t, alternatives);
5164 }
5165 tree.type = result = t;
5166 }
5167
5168 public void visitTypeIntersection(JCTypeIntersection tree) {
5169 attribTypes(tree.bounds, env);
5170 tree.type = result = checkIntersection(tree, tree.bounds);
5171 }
5172
5173 public void visitTypeParameter(JCTypeParameter tree) {
5174 TypeVar typeVar = (TypeVar) tree.type;
5175
5176 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5177 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5178 }
5179
5180 if (!typeVar.getUpperBound().isErroneous()) {
5181 //fixup type-parameter bound computed in 'attribTypeVariables'
5182 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5183 }
5184 }
5185
5186 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5187 Set<Symbol> boundSet = new HashSet<>();
5188 if (bounds.nonEmpty()) {
5189 // accept class or interface or typevar as first bound.
5190 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5191 boundSet.add(types.erasure(bounds.head.type).tsym);
5192 if (bounds.head.type.isErroneous()) {
5193 return bounds.head.type;
5194 }
5195 else if (bounds.head.type.hasTag(TYPEVAR)) {
5196 // if first bound was a typevar, do not accept further bounds.
5197 if (bounds.tail.nonEmpty()) {
5198 log.error(bounds.tail.head.pos(),
5199 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5200 return bounds.head.type;
5201 }
5202 } else {
5203 // if first bound was a class or interface, accept only interfaces
5204 // as further bounds.
5205 for (JCExpression bound : bounds.tail) {
5206 bound.type = checkBase(bound.type, bound, env, false, true, false);
5207 if (bound.type.isErroneous()) {
5208 bounds = List.of(bound);
5209 }
5210 else if (bound.type.hasTag(CLASS)) {
5211 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5212 }
5213 }
5214 }
5215 }
5216
5217 if (bounds.length() == 0) {
5218 return syms.objectType;
5219 } else if (bounds.length() == 1) {
5220 return bounds.head.type;
5221 } else {
5222 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5223 // ... the variable's bound is a class type flagged COMPOUND
5224 // (see comment for TypeVar.bound).
5225 // In this case, generate a class tree that represents the
5226 // bound class, ...
5227 JCExpression extending;
5228 List<JCExpression> implementing;
5229 if (!bounds.head.type.isInterface()) {
5230 extending = bounds.head;
5231 implementing = bounds.tail;
5232 } else {
5233 extending = null;
5234 implementing = bounds;
5235 }
5236 JCClassDecl cd = make.at(tree).ClassDef(
5237 make.Modifiers(PUBLIC | ABSTRACT),
5238 names.empty, List.nil(),
5239 extending, implementing, List.nil());
5240
5241 ClassSymbol c = (ClassSymbol)owntype.tsym;
5242 Assert.check((c.flags() & COMPOUND) != 0);
5243 cd.sym = c;
5244 c.sourcefile = env.toplevel.sourcefile;
5245
5246 // ... and attribute the bound class
5247 c.flags_field |= UNATTRIBUTED;
5248 Env<AttrContext> cenv = enter.classEnv(cd, env);
5249 typeEnvs.put(c, cenv);
5250 attribClass(c);
5251 return owntype;
5252 }
5253 }
5254
5255 public void visitWildcard(JCWildcard tree) {
5256 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5257 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5258 ? syms.objectType
5259 : attribType(tree.inner, env);
5260 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5261 tree.kind.kind,
5262 syms.boundClass),
5263 KindSelector.TYP, resultInfo);
5264 }
5265
5266 public void visitAnnotation(JCAnnotation tree) {
5267 Assert.error("should be handled in annotate");
5268 }
5269
5270 @Override
5271 public void visitModifiers(JCModifiers tree) {
5272 //error recovery only:
5273 Assert.check(resultInfo.pkind == KindSelector.ERR);
5274
5275 attribAnnotationTypes(tree.annotations, env);
5276 }
5277
5278 public void visitAnnotatedType(JCAnnotatedType tree) {
5279 attribAnnotationTypes(tree.annotations, env);
5280 Type underlyingType = attribType(tree.underlyingType, env);
5281 Type annotatedType = underlyingType.preannotatedType();
5282
5283 if (!env.info.isNewClass)
5284 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5285 result = tree.type = annotatedType;
5286 }
5287
5288 public void visitErroneous(JCErroneous tree) {
5289 if (tree.errs != null) {
5290 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup());
5291 errEnv.info.returnResult = unknownExprInfo;
5292 for (JCTree err : tree.errs)
5293 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5294 }
5295 result = tree.type = syms.errType;
5296 }
5297
5298 /** Default visitor method for all other trees.
5299 */
5300 public void visitTree(JCTree tree) {
5301 throw new AssertionError();
5302 }
5303
5304 /**
5305 * Attribute an env for either a top level tree or class or module declaration.
5306 */
5307 public void attrib(Env<AttrContext> env) {
5308 switch (env.tree.getTag()) {
5309 case MODULEDEF:
5310 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5311 break;
5312 case PACKAGEDEF:
5313 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5314 break;
5315 default:
5316 attribClass(env.tree.pos(), env.enclClass.sym);
5317 }
5318 }
5319
5320 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5321 try {
5322 annotate.flush();
5323 attribPackage(p);
5324 } catch (CompletionFailure ex) {
5325 chk.completionError(pos, ex);
5326 }
5327 }
5328
5329 void attribPackage(PackageSymbol p) {
5330 attribWithLint(p,
5331 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5332 }
5333
5334 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5335 try {
5336 annotate.flush();
5337 attribModule(m);
5338 } catch (CompletionFailure ex) {
5339 chk.completionError(pos, ex);
5340 }
5341 }
5342
5343 void attribModule(ModuleSymbol m) {
5344 attribWithLint(m, env -> attribStat(env.tree, env));
5345 }
5346
5347 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5348 Env<AttrContext> env = typeEnvs.get(sym);
5349
5350 Env<AttrContext> lintEnv = env;
5351 while (lintEnv.info.lint == null)
5352 lintEnv = lintEnv.next;
5353
5354 Lint lint = lintEnv.info.lint.augment(sym);
5355
5356 Lint prevLint = chk.setLint(lint);
5357 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5358
5359 try {
5360 deferredLintHandler.flush(env.tree.pos());
5361 attrib.accept(env);
5362 } finally {
5363 log.useSource(prev);
5364 chk.setLint(prevLint);
5365 }
5366 }
5367
5368 /** Main method: attribute class definition associated with given class symbol.
5369 * reporting completion failures at the given position.
5370 * @param pos The source position at which completion errors are to be
5371 * reported.
5372 * @param c The class symbol whose definition will be attributed.
5373 */
5374 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5375 try {
5376 annotate.flush();
5377 attribClass(c);
5378 } catch (CompletionFailure ex) {
5379 chk.completionError(pos, ex);
5380 }
5381 }
5382
5383 /** Attribute class definition associated with given class symbol.
5384 * @param c The class symbol whose definition will be attributed.
5385 */
5386 void attribClass(ClassSymbol c) throws CompletionFailure {
5387 if (c.type.hasTag(ERROR)) return;
5388
5389 // Check for cycles in the inheritance graph, which can arise from
5390 // ill-formed class files.
5391 chk.checkNonCyclic(null, c.type);
5392
5393 Type st = types.supertype(c.type);
5394 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5395 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5396 // First, attribute superclass.
5397 if (st.hasTag(CLASS))
5398 attribClass((ClassSymbol)st.tsym);
5399
5400 // Next attribute owner, if it is a class.
5401 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5402 attribClass((ClassSymbol)c.owner);
5403
5404 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5405 }
5406
5407 // The previous operations might have attributed the current class
5408 // if there was a cycle. So we test first whether the class is still
5409 // UNATTRIBUTED.
5410 if ((c.flags_field & UNATTRIBUTED) != 0) {
5411 c.flags_field &= ~UNATTRIBUTED;
5412
5413 // Get environment current at the point of class definition.
5414 Env<AttrContext> env = typeEnvs.get(c);
5415
5416 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5417 // because the annotations were not available at the time the env was created. Therefore,
5418 // we look up the environment chain for the first enclosing environment for which the
5419 // lint value is set. Typically, this is the parent env, but might be further if there
5420 // are any envs created as a result of TypeParameter nodes.
5421 Env<AttrContext> lintEnv = env;
5422 while (lintEnv.info.lint == null)
5423 lintEnv = lintEnv.next;
5424
5425 // Having found the enclosing lint value, we can initialize the lint value for this class
5426 env.info.lint = lintEnv.info.lint.augment(c);
5427
5428 Lint prevLint = chk.setLint(env.info.lint);
5429 JavaFileObject prev = log.useSource(c.sourcefile);
5430 ResultInfo prevReturnRes = env.info.returnResult;
5431
5432 try {
5433 if (c.isSealed() &&
5434 !c.isEnum() &&
5435 !c.isPermittedExplicit &&
5436 c.getPermittedSubclasses().isEmpty()) {
5437 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5438 }
5439
5440 if (c.isSealed()) {
5441 Set<Symbol> permittedTypes = new HashSet<>();
5442 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5443 for (Type subType : c.getPermittedSubclasses()) {
5444 boolean isTypeVar = false;
5445 if (subType.getTag() == TYPEVAR) {
5446 isTypeVar = true; //error recovery
5447 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5448 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5449 }
5450 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5451 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5452 }
5453 if (permittedTypes.contains(subType.tsym)) {
5454 DiagnosticPosition pos =
5455 env.enclClass.permitting.stream()
5456 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5457 .limit(2).collect(List.collector()).get(1);
5458 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5459 } else {
5460 permittedTypes.add(subType.tsym);
5461 }
5462 if (sealedInUnnamed) {
5463 if (subType.tsym.packge() != c.packge()) {
5464 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5465 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5466 );
5467 }
5468 } else if (subType.tsym.packge().modle != c.packge().modle) {
5469 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5470 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5471 );
5472 }
5473 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5474 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5475 Errors.InvalidPermitsClause(
5476 subType.tsym == c.type.tsym ?
5477 Fragments.MustNotBeSameClass :
5478 Fragments.MustNotBeSupertype(subType)
5479 )
5480 );
5481 } else if (!isTypeVar) {
5482 boolean thisIsASuper = types.directSupertypes(subType)
5483 .stream()
5484 .anyMatch(d -> d.tsym == c);
5485 if (!thisIsASuper) {
5486 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5487 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5488 }
5489 }
5490 }
5491 }
5492
5493 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5494 .stream()
5495 .filter(s -> s.tsym.isSealed())
5496 .map(s -> (ClassSymbol) s.tsym)
5497 .collect(List.collector());
5498
5499 if (sealedSupers.isEmpty()) {
5500 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5501 boolean hasErrorSuper = false;
5502
5503 hasErrorSuper |= types.directSupertypes(c.type)
5504 .stream()
5505 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5506
5507 ClassType ct = (ClassType) c.type;
5508
5509 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5510
5511 if (!hasErrorSuper) {
5512 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5513 }
5514 }
5515 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5516 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5517 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5518 }
5519
5520 if (!c.type.isCompound()) {
5521 for (ClassSymbol supertypeSym : sealedSupers) {
5522 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5523 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5524 }
5525 }
5526 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5527 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5528 c.isInterface() ?
5529 Errors.NonSealedOrSealedExpected :
5530 Errors.NonSealedSealedOrFinalExpected);
5531 }
5532 }
5533 }
5534
5535 deferredLintHandler.flush(env.tree);
5536 env.info.returnResult = null;
5537 // java.lang.Enum may not be subclassed by a non-enum
5538 if (st.tsym == syms.enumSym &&
5539 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5540 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5541
5542 // Enums may not be extended by source-level classes
5543 if (st.tsym != null &&
5544 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5545 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5546 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5547 }
5548
5549 if (rs.isSerializable(c.type)) {
5550 env.info.isSerializable = true;
5551 }
5552
5553 if (c.isValueClass()) {
5554 Assert.check(env.tree.hasTag(CLASSDEF));
5555 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5556 }
5557
5558 attribClassBody(env, c);
5559
5560 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5561 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5562 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5563 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5564
5565 if (c.isImplicit()) {
5566 chk.checkHasMain(env.tree.pos(), c);
5567 }
5568 } finally {
5569 env.info.returnResult = prevReturnRes;
5570 log.useSource(prev);
5571 chk.setLint(prevLint);
5572 }
5573
5574 }
5575 }
5576
5577 public void visitImport(JCImport tree) {
5578 // nothing to do
5579 }
5580
5581 public void visitModuleDef(JCModuleDecl tree) {
5582 tree.sym.completeUsesProvides();
5583 ModuleSymbol msym = tree.sym;
5584 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5585 Lint prevLint = chk.setLint(lint);
5586 chk.checkModuleName(tree);
5587 chk.checkDeprecatedAnnotation(tree, msym);
5588
5589 try {
5590 deferredLintHandler.flush(tree.pos());
5591 } finally {
5592 chk.setLint(prevLint);
5593 }
5594 }
5595
5596 /** Finish the attribution of a class. */
5597 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5598 JCClassDecl tree = (JCClassDecl)env.tree;
5599 Assert.check(c == tree.sym);
5600
5601 // Validate type parameters, supertype and interfaces.
5602 attribStats(tree.typarams, env);
5603 if (!c.isAnonymous()) {
5604 //already checked if anonymous
5605 chk.validate(tree.typarams, env);
5606 chk.validate(tree.extending, env);
5607 chk.validate(tree.implementing, env);
5608 }
5609
5610 c.markAbstractIfNeeded(types);
5611
5612 // If this is a non-abstract class, check that it has no abstract
5613 // methods or unimplemented methods of an implemented interface.
5614 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5615 chk.checkAllDefined(tree.pos(), c);
5616 }
5617
5618 if ((c.flags() & ANNOTATION) != 0) {
5619 if (tree.implementing.nonEmpty())
5620 log.error(tree.implementing.head.pos(),
5621 Errors.CantExtendIntfAnnotation);
5622 if (tree.typarams.nonEmpty()) {
5623 log.error(tree.typarams.head.pos(),
5624 Errors.IntfAnnotationCantHaveTypeParams(c));
5625 }
5626
5627 // If this annotation type has a @Repeatable, validate
5628 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5629 // If this annotation type has a @Repeatable, validate
5630 if (repeatable != null) {
5631 // get diagnostic position for error reporting
5632 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5633 Assert.checkNonNull(cbPos);
5634
5635 chk.validateRepeatable(c, repeatable, cbPos);
5636 }
5637 } else {
5638 // Check that all extended classes and interfaces
5639 // are compatible (i.e. no two define methods with same arguments
5640 // yet different return types). (JLS 8.4.8.3)
5641 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5642 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5643 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5644 }
5645
5646 // Check that class does not import the same parameterized interface
5647 // with two different argument lists.
5648 chk.checkClassBounds(tree.pos(), c.type);
5649
5650 tree.type = c.type;
5651
5652 for (List<JCTypeParameter> l = tree.typarams;
5653 l.nonEmpty(); l = l.tail) {
5654 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5655 }
5656
5657 // Check that a generic class doesn't extend Throwable
5658 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5659 log.error(tree.extending.pos(), Errors.GenericThrowable);
5660
5661 // Check that all methods which implement some
5662 // method conform to the method they implement.
5663 chk.checkImplementations(tree);
5664
5665 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5666 checkAutoCloseable(tree.pos(), env, c.type);
5667
5668 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5669 // Attribute declaration
5670 attribStat(l.head, env);
5671 // Check that declarations in inner classes are not static (JLS 8.1.2)
5672 // Make an exception for static constants.
5673 if (!allowRecords &&
5674 c.owner.kind != PCK &&
5675 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5676 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5677 VarSymbol sym = null;
5678 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5679 if (sym == null ||
5680 sym.kind != VAR ||
5681 sym.getConstValue() == null)
5682 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5683 }
5684 }
5685
5686 // Check for proper placement of super()/this() calls.
5687 chk.checkSuperInitCalls(tree);
5688
5689 // Check for cycles among non-initial constructors.
5690 chk.checkCyclicConstructors(tree);
5691
5692 // Check for cycles among annotation elements.
5693 chk.checkNonCyclicElements(tree);
5694
5695 // Check for proper use of serialVersionUID and other
5696 // serialization-related fields and methods
5697 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5698 && rs.isSerializable(c.type)
5699 && !c.isAnonymous()) {
5700 chk.checkSerialStructure(env, tree, c);
5701 }
5702 // Correctly organize the positions of the type annotations
5703 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5704
5705 // Check type annotations applicability rules
5706 validateTypeAnnotations(tree, false);
5707 }
5708 // where
5709 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5710 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5711 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5712 if (types.isSameType(al.head.annotationType.type, t))
5713 return al.head.pos();
5714 }
5715
5716 return null;
5717 }
5718
5719 private Type capture(Type type) {
5720 return types.capture(type);
5721 }
5722
5723 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5724 if (type.isErroneous()) {
5725 tree.vartype = make.at(Position.NOPOS).Erroneous();
5726 } else {
5727 tree.vartype = make.at(Position.NOPOS).Type(type);
5728 }
5729 }
5730
5731 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5732 tree.accept(new TypeAnnotationsValidator(sigOnly));
5733 }
5734 //where
5735 private final class TypeAnnotationsValidator extends TreeScanner {
5736
5737 private final boolean sigOnly;
5738 public TypeAnnotationsValidator(boolean sigOnly) {
5739 this.sigOnly = sigOnly;
5740 }
5741
5742 public void visitAnnotation(JCAnnotation tree) {
5743 chk.validateTypeAnnotation(tree, null, false);
5744 super.visitAnnotation(tree);
5745 }
5746 public void visitAnnotatedType(JCAnnotatedType tree) {
5747 if (!tree.underlyingType.type.isErroneous()) {
5748 super.visitAnnotatedType(tree);
5749 }
5750 }
5751 public void visitTypeParameter(JCTypeParameter tree) {
5752 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5753 scan(tree.bounds);
5754 // Don't call super.
5755 // This is needed because above we call validateTypeAnnotation with
5756 // false, which would forbid annotations on type parameters.
5757 // super.visitTypeParameter(tree);
5758 }
5759 public void visitMethodDef(JCMethodDecl tree) {
5760 if (tree.recvparam != null &&
5761 !tree.recvparam.vartype.type.isErroneous()) {
5762 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5763 }
5764 if (tree.restype != null && tree.restype.type != null) {
5765 validateAnnotatedType(tree.restype, tree.restype.type);
5766 }
5767 if (sigOnly) {
5768 scan(tree.mods);
5769 scan(tree.restype);
5770 scan(tree.typarams);
5771 scan(tree.recvparam);
5772 scan(tree.params);
5773 scan(tree.thrown);
5774 } else {
5775 scan(tree.defaultValue);
5776 scan(tree.body);
5777 }
5778 }
5779 public void visitVarDef(final JCVariableDecl tree) {
5780 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5781 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5782 validateAnnotatedType(tree.vartype, tree.sym.type);
5783 scan(tree.mods);
5784 scan(tree.vartype);
5785 if (!sigOnly) {
5786 scan(tree.init);
5787 }
5788 }
5789 public void visitTypeCast(JCTypeCast tree) {
5790 if (tree.clazz != null && tree.clazz.type != null)
5791 validateAnnotatedType(tree.clazz, tree.clazz.type);
5792 super.visitTypeCast(tree);
5793 }
5794 public void visitTypeTest(JCInstanceOf tree) {
5795 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5796 validateAnnotatedType(tree.pattern, tree.pattern.type);
5797 super.visitTypeTest(tree);
5798 }
5799 public void visitNewClass(JCNewClass tree) {
5800 if (tree.clazz != null && tree.clazz.type != null) {
5801 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5802 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5803 tree.clazz.type.tsym);
5804 }
5805 if (tree.def != null) {
5806 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5807 }
5808
5809 validateAnnotatedType(tree.clazz, tree.clazz.type);
5810 }
5811 super.visitNewClass(tree);
5812 }
5813 public void visitNewArray(JCNewArray tree) {
5814 if (tree.elemtype != null && tree.elemtype.type != null) {
5815 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5816 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5817 tree.elemtype.type.tsym);
5818 }
5819 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5820 }
5821 super.visitNewArray(tree);
5822 }
5823 public void visitClassDef(JCClassDecl tree) {
5824 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5825 if (sigOnly) {
5826 scan(tree.mods);
5827 scan(tree.typarams);
5828 scan(tree.extending);
5829 scan(tree.implementing);
5830 }
5831 for (JCTree member : tree.defs) {
5832 if (member.hasTag(Tag.CLASSDEF)) {
5833 continue;
5834 }
5835 scan(member);
5836 }
5837 }
5838 public void visitBlock(JCBlock tree) {
5839 if (!sigOnly) {
5840 scan(tree.stats);
5841 }
5842 }
5843
5844 /* I would want to model this after
5845 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5846 * and override visitSelect and visitTypeApply.
5847 * However, we only set the annotated type in the top-level type
5848 * of the symbol.
5849 * Therefore, we need to override each individual location where a type
5850 * can occur.
5851 */
5852 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5853 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5854
5855 if (type.isPrimitiveOrVoid()) {
5856 return;
5857 }
5858
5859 JCTree enclTr = errtree;
5860 Type enclTy = type;
5861
5862 boolean repeat = true;
5863 while (repeat) {
5864 if (enclTr.hasTag(TYPEAPPLY)) {
5865 List<Type> tyargs = enclTy.getTypeArguments();
5866 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5867 if (trargs.length() > 0) {
5868 // Nothing to do for diamonds
5869 if (tyargs.length() == trargs.length()) {
5870 for (int i = 0; i < tyargs.length(); ++i) {
5871 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5872 }
5873 }
5874 // If the lengths don't match, it's either a diamond
5875 // or some nested type that redundantly provides
5876 // type arguments in the tree.
5877 }
5878
5879 // Look at the clazz part of a generic type
5880 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5881 }
5882
5883 if (enclTr.hasTag(SELECT)) {
5884 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5885 if (enclTy != null &&
5886 !enclTy.hasTag(NONE)) {
5887 enclTy = enclTy.getEnclosingType();
5888 }
5889 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5890 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5891 if (enclTy == null || enclTy.hasTag(NONE)) {
5892 if (at.getAnnotations().size() == 1) {
5893 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5894 } else {
5895 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5896 for (JCAnnotation an : at.getAnnotations()) {
5897 comps.add(an.attribute);
5898 }
5899 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5900 }
5901 repeat = false;
5902 }
5903 enclTr = at.underlyingType;
5904 // enclTy doesn't need to be changed
5905 } else if (enclTr.hasTag(IDENT)) {
5906 repeat = false;
5907 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5908 JCWildcard wc = (JCWildcard) enclTr;
5909 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5910 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5911 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5912 } else {
5913 // Nothing to do for UNBOUND
5914 }
5915 repeat = false;
5916 } else if (enclTr.hasTag(TYPEARRAY)) {
5917 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5918 validateAnnotatedType(art.getType(), art.elemtype.type);
5919 repeat = false;
5920 } else if (enclTr.hasTag(TYPEUNION)) {
5921 JCTypeUnion ut = (JCTypeUnion) enclTr;
5922 for (JCTree t : ut.getTypeAlternatives()) {
5923 validateAnnotatedType(t, t.type);
5924 }
5925 repeat = false;
5926 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5927 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5928 for (JCTree t : it.getBounds()) {
5929 validateAnnotatedType(t, t.type);
5930 }
5931 repeat = false;
5932 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5933 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5934 repeat = false;
5935 } else {
5936 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5937 " within: "+ errtree + " with kind: " + errtree.getKind());
5938 }
5939 }
5940 }
5941
5942 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5943 Symbol sym) {
5944 // Ensure that no declaration annotations are present.
5945 // Note that a tree type might be an AnnotatedType with
5946 // empty annotations, if only declaration annotations were given.
5947 // This method will raise an error for such a type.
5948 for (JCAnnotation ai : annotations) {
5949 if (!ai.type.isErroneous() &&
5950 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5951 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5952 }
5953 }
5954 }
5955 }
5956
5957 // <editor-fold desc="post-attribution visitor">
5958
5959 /**
5960 * Handle missing types/symbols in an AST. This routine is useful when
5961 * the compiler has encountered some errors (which might have ended up
5962 * terminating attribution abruptly); if the compiler is used in fail-over
5963 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5964 * prevents NPE to be propagated during subsequent compilation steps.
5965 */
5966 public void postAttr(JCTree tree) {
5967 new PostAttrAnalyzer().scan(tree);
5968 }
5969
5970 class PostAttrAnalyzer extends TreeScanner {
5971
5972 private void initTypeIfNeeded(JCTree that) {
5973 if (that.type == null) {
5974 if (that.hasTag(METHODDEF)) {
5975 that.type = dummyMethodType((JCMethodDecl)that);
5976 } else {
5977 that.type = syms.unknownType;
5978 }
5979 }
5980 }
5981
5982 /* Construct a dummy method type. If we have a method declaration,
5983 * and the declared return type is void, then use that return type
5984 * instead of UNKNOWN to avoid spurious error messages in lambda
5985 * bodies (see:JDK-8041704).
5986 */
5987 private Type dummyMethodType(JCMethodDecl md) {
5988 Type restype = syms.unknownType;
5989 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5990 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5991 if (prim.typetag == VOID)
5992 restype = syms.voidType;
5993 }
5994 return new MethodType(List.nil(), restype,
5995 List.nil(), syms.methodClass);
5996 }
5997 private Type dummyMethodType() {
5998 return dummyMethodType(null);
5999 }
6000
6001 @Override
6002 public void scan(JCTree tree) {
6003 if (tree == null) return;
6004 if (tree instanceof JCExpression) {
6005 initTypeIfNeeded(tree);
6006 }
6007 super.scan(tree);
6008 }
6009
6010 @Override
6011 public void visitIdent(JCIdent that) {
6012 if (that.sym == null) {
6013 that.sym = syms.unknownSymbol;
6014 }
6015 }
6016
6017 @Override
6018 public void visitSelect(JCFieldAccess that) {
6019 if (that.sym == null) {
6020 that.sym = syms.unknownSymbol;
6021 }
6022 super.visitSelect(that);
6023 }
6024
6025 @Override
6026 public void visitClassDef(JCClassDecl that) {
6027 initTypeIfNeeded(that);
6028 if (that.sym == null) {
6029 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6030 }
6031 super.visitClassDef(that);
6032 }
6033
6034 @Override
6035 public void visitMethodDef(JCMethodDecl that) {
6036 initTypeIfNeeded(that);
6037 if (that.sym == null) {
6038 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6039 }
6040 super.visitMethodDef(that);
6041 }
6042
6043 @Override
6044 public void visitVarDef(JCVariableDecl that) {
6045 initTypeIfNeeded(that);
6046 if (that.sym == null) {
6047 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6048 that.sym.adr = 0;
6049 }
6050 if (that.vartype == null) {
6051 that.vartype = make.at(Position.NOPOS).Erroneous();
6052 }
6053 super.visitVarDef(that);
6054 }
6055
6056 @Override
6057 public void visitBindingPattern(JCBindingPattern that) {
6058 initTypeIfNeeded(that);
6059 initTypeIfNeeded(that.var);
6060 if (that.var.sym == null) {
6061 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6062 that.var.sym.adr = 0;
6063 }
6064 super.visitBindingPattern(that);
6065 }
6066
6067 @Override
6068 public void visitNewClass(JCNewClass that) {
6069 if (that.constructor == null) {
6070 that.constructor = new MethodSymbol(0, names.init,
6071 dummyMethodType(), syms.noSymbol);
6072 }
6073 if (that.constructorType == null) {
6074 that.constructorType = syms.unknownType;
6075 }
6076 super.visitNewClass(that);
6077 }
6078
6079 @Override
6080 public void visitAssignop(JCAssignOp that) {
6081 if (that.operator == null) {
6082 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6083 -1, syms.noSymbol);
6084 }
6085 super.visitAssignop(that);
6086 }
6087
6088 @Override
6089 public void visitBinary(JCBinary that) {
6090 if (that.operator == null) {
6091 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6092 -1, syms.noSymbol);
6093 }
6094 super.visitBinary(that);
6095 }
6096
6097 @Override
6098 public void visitUnary(JCUnary that) {
6099 if (that.operator == null) {
6100 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6101 -1, syms.noSymbol);
6102 }
6103 super.visitUnary(that);
6104 }
6105
6106 @Override
6107 public void visitReference(JCMemberReference that) {
6108 super.visitReference(that);
6109 if (that.sym == null) {
6110 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6111 syms.noSymbol);
6112 }
6113 }
6114 }
6115 // </editor-fold>
6116
6117 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6118 new TreeScanner() {
6119 Symbol packge = pkg;
6120 @Override
6121 public void visitIdent(JCIdent that) {
6122 that.sym = packge;
6123 }
6124
6125 @Override
6126 public void visitSelect(JCFieldAccess that) {
6127 that.sym = packge;
6128 packge = packge.owner;
6129 super.visitSelect(that);
6130 }
6131 }.scan(pid);
6132 }
6133
6134 }