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