1 /*
2 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.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.LintWarnings;
62 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
63 import com.sun.tools.javac.tree.*;
64 import com.sun.tools.javac.tree.JCTree.*;
65 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
66 import com.sun.tools.javac.util.*;
67 import com.sun.tools.javac.util.DefinedBy.Api;
68 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
69 import com.sun.tools.javac.util.JCDiagnostic.Error;
70 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
71 import com.sun.tools.javac.util.JCDiagnostic.Warning;
72 import com.sun.tools.javac.util.List;
73
74 import static com.sun.tools.javac.code.Flags.*;
75 import static com.sun.tools.javac.code.Flags.ANNOTATION;
76 import static com.sun.tools.javac.code.Flags.BLOCK;
77 import static com.sun.tools.javac.code.Kinds.*;
78 import static com.sun.tools.javac.code.Kinds.Kind.*;
79 import static com.sun.tools.javac.code.TypeTag.*;
80 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
81 import static com.sun.tools.javac.tree.JCTree.Tag.*;
82 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
83
84 /** This is the main context-dependent analysis phase in GJC. It
85 * encompasses name resolution, type checking and constant folding as
86 * subtasks. Some subtasks involve auxiliary classes.
87 * @see Check
88 * @see Resolve
89 * @see ConstFold
90 * @see Infer
91 *
92 * <p><b>This is NOT part of any supported API.
93 * If you write code that depends on this, you do so at your own risk.
94 * This code and its internal interfaces are subject to change or
95 * deletion without notice.</b>
96 */
97 public class Attr extends JCTree.Visitor {
98 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
99
100 final Names names;
101 final Log log;
102 final Symtab syms;
103 final Resolve rs;
104 final Operators operators;
105 final Infer infer;
106 final Analyzer analyzer;
107 final DeferredAttr deferredAttr;
108 final Check chk;
109 final Flow flow;
110 final MemberEnter memberEnter;
111 final TypeEnter typeEnter;
112 final TreeMaker make;
113 final ConstFold cfolder;
114 final Enter enter;
115 final Target target;
116 final Types types;
117 final Preview preview;
118 final JCDiagnostic.Factory diags;
119 final TypeAnnotations typeAnnotations;
120 final DeferredLintHandler deferredLintHandler;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127
128 public static Attr instance(Context context) {
129 Attr instance = context.get(attrKey);
130 if (instance == null)
131 instance = new Attr(context);
132 return instance;
133 }
134
135 @SuppressWarnings("this-escape")
136 protected Attr(Context context) {
137 context.put(attrKey, this);
138
139 names = Names.instance(context);
140 log = Log.instance(context);
141 syms = Symtab.instance(context);
142 rs = Resolve.instance(context);
143 operators = Operators.instance(context);
144 chk = Check.instance(context);
145 flow = Flow.instance(context);
146 memberEnter = MemberEnter.instance(context);
147 typeEnter = TypeEnter.instance(context);
148 make = TreeMaker.instance(context);
149 enter = Enter.instance(context);
150 infer = Infer.instance(context);
151 analyzer = Analyzer.instance(context);
152 deferredAttr = DeferredAttr.instance(context);
153 cfolder = ConstFold.instance(context);
154 target = Target.instance(context);
155 types = Types.instance(context);
156 preview = Preview.instance(context);
157 diags = JCDiagnostic.Factory.instance(context);
158 annotate = Annotate.instance(context);
159 typeAnnotations = TypeAnnotations.instance(context);
160 deferredLintHandler = DeferredLintHandler.instance(context);
161 typeEnvs = TypeEnvs.instance(context);
162 dependencies = Dependencies.instance(context);
163 argumentAttr = ArgumentAttr.instance(context);
164 matchBindingsComputer = MatchBindingsComputer.instance(context);
165 attrRecover = AttrRecover.instance(context);
166
167 Options options = Options.instance(context);
168
169 Source source = Source.instance(context);
170 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
171 allowRecords = Feature.RECORDS.allowedInSource(source);
172 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
173 Feature.PATTERN_SWITCH.allowedInSource(source);
174 allowUnconditionalPatternsInstanceOf =
175 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
176 sourceName = source.name;
177 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
178
179 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
180 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
181 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
182 methodAttrInfo = new MethodAttrInfo();
183 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
184 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
185 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
186 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
187 }
188
189 /** Switch: reifiable types in instanceof enabled?
190 */
191 boolean allowReifiableTypesInInstanceof;
192
193 /** Are records allowed
194 */
195 private final boolean allowRecords;
196
197 /** Are patterns in switch allowed
198 */
199 private final boolean allowPatternSwitch;
200
201 /** Are unconditional patterns in instanceof allowed
202 */
203 private final boolean allowUnconditionalPatternsInstanceOf;
204
205 /**
206 * Switch: warn about use of variable before declaration?
207 * RFE: 6425594
208 */
209 boolean useBeforeDeclarationWarning;
210
211 /**
212 * Switch: name of source level; used for error reporting.
213 */
214 String sourceName;
215
216 /** Check kind and type of given tree against protokind and prototype.
217 * If check succeeds, store type in tree and return it.
218 * If check fails, store errType in tree and return it.
219 * No checks are performed if the prototype is a method type.
220 * It is not necessary in this case since we know that kind and type
221 * are correct.
222 *
223 * @param tree The tree whose kind and type is checked
224 * @param found The computed type of the tree
225 * @param ownkind The computed kind of the tree
226 * @param resultInfo The expected result of the tree
227 */
228 Type check(final JCTree tree,
229 final Type found,
230 final KindSelector ownkind,
231 final ResultInfo resultInfo) {
232 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
233 Type owntype;
234 boolean shouldCheck = !found.hasTag(ERROR) &&
235 !resultInfo.pt.hasTag(METHOD) &&
236 !resultInfo.pt.hasTag(FORALL);
237 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
238 log.error(tree.pos(),
239 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
240 ownkind.kindNames()));
241 owntype = types.createErrorType(found);
242 } else if (inferenceContext.free(found)) {
243 //delay the check if there are inference variables in the found type
244 //this means we are dealing with a partially inferred poly expression
245 owntype = shouldCheck ? resultInfo.pt : found;
246 if (resultInfo.checkMode.installPostInferenceHook()) {
247 inferenceContext.addFreeTypeListener(List.of(found),
248 instantiatedContext -> {
249 ResultInfo pendingResult =
250 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
251 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
252 });
253 }
254 } else {
255 owntype = shouldCheck ?
256 resultInfo.check(tree, found) :
257 found;
258 }
259 if (resultInfo.checkMode.updateTreeType()) {
260 tree.type = owntype;
261 }
262 return owntype;
263 }
264
265 /** Is given blank final variable assignable, i.e. in a scope where it
266 * may be assigned to even though it is final?
267 * @param v The blank final variable.
268 * @param env The current environment.
269 */
270 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
271 Symbol owner = env.info.scope.owner;
272 // owner refers to the innermost variable, method or
273 // initializer block declaration at this point.
274 boolean isAssignable =
275 v.owner == owner
276 ||
277 ((owner.name == names.init || // i.e. we are in a constructor
278 owner.kind == VAR || // i.e. we are in a variable initializer
279 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
280 &&
281 v.owner == owner.owner
282 &&
283 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
284 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
285 return isAssignable & !insideCompactConstructor;
286 }
287
288 /** Check that variable can be assigned to.
289 * @param pos The current source code position.
290 * @param v The assigned variable
291 * @param base If the variable is referred to in a Select, the part
292 * to the left of the `.', null otherwise.
293 * @param env The current environment.
294 */
295 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
296 if (v.name == names._this) {
297 log.error(pos, Errors.CantAssignValToThis);
298 return;
299 }
300 if ((v.flags() & FINAL) != 0 &&
301 ((v.flags() & HASINIT) != 0
302 ||
303 !((base == null ||
304 TreeInfo.isThisQualifier(base)) &&
305 isAssignableAsBlankFinal(v, env)))) {
306 if (v.isResourceVariable()) { //TWR resource
307 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
308 } else {
309 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
310 }
311 return;
312 }
313
314 // Check instance field assignments that appear in constructor prologues
315 if (rs.isEarlyReference(env, base, v)) {
316
317 // Field may not be inherited from a superclass
318 if (v.owner != env.enclClass.sym) {
319 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
320 return;
321 }
322
323 // Field may not have an initializer
324 if ((v.flags() & HASINIT) != 0) {
325 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
326 return;
327 }
328 }
329 }
330
331 /** Does tree represent a static reference to an identifier?
332 * It is assumed that tree is either a SELECT or an IDENT.
333 * We have to weed out selects from non-type names here.
334 * @param tree The candidate tree.
335 */
336 boolean isStaticReference(JCTree tree) {
337 if (tree.hasTag(SELECT)) {
338 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
339 if (lsym == null || lsym.kind != TYP) {
340 return false;
341 }
342 }
343 return true;
344 }
345
346 /** Is this symbol a type?
347 */
348 static boolean isType(Symbol sym) {
349 return sym != null && sym.kind == TYP;
350 }
351
352 /** Attribute a parsed identifier.
353 * @param tree Parsed identifier name
354 * @param topLevel The toplevel to use
355 */
356 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
357 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
358 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
359 syms.errSymbol.name,
360 null, null, null, null);
361 localEnv.enclClass.sym = syms.errSymbol;
362 return attribIdent(tree, localEnv);
363 }
364
365 /** Attribute a parsed identifier.
366 * @param tree Parsed identifier name
367 * @param env The env to use
368 */
369 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
370 return tree.accept(identAttributer, env);
371 }
372 // where
373 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
374 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
375 @Override @DefinedBy(Api.COMPILER_TREE)
376 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
377 Symbol site = visit(node.getExpression(), env);
378 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
379 return site;
380 Name name = (Name)node.getIdentifier();
381 if (site.kind == PCK) {
382 env.toplevel.packge = (PackageSymbol)site;
383 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
384 KindSelector.TYP_PCK);
385 } else {
386 env.enclClass.sym = (ClassSymbol)site;
387 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
388 }
389 }
390
391 @Override @DefinedBy(Api.COMPILER_TREE)
392 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
393 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
394 }
395 }
396
397 public Type coerce(Type etype, Type ttype) {
398 return cfolder.coerce(etype, ttype);
399 }
400
401 public Type attribType(JCTree node, TypeSymbol sym) {
402 Env<AttrContext> env = typeEnvs.get(sym);
403 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
404 return attribTree(node, localEnv, unknownTypeInfo);
405 }
406
407 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
408 // Attribute qualifying package or class.
409 JCFieldAccess s = tree.qualid;
410 return attribTree(s.selected, env,
411 new ResultInfo(tree.staticImport ?
412 KindSelector.TYP : KindSelector.TYP_PCK,
413 Type.noType));
414 }
415
416 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
417 return attribToTree(expr, env, tree, unknownExprInfo);
418 }
419
420 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
421 return attribToTree(stmt, env, tree, statInfo);
422 }
423
424 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
425 breakTree = tree;
426 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
427 try {
428 deferredAttr.attribSpeculative(root, env, resultInfo,
429 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
430 argumentAttr.withLocalCacheContext());
431 attrRecover.doRecovery();
432 } catch (BreakAttr b) {
433 return b.env;
434 } catch (AssertionError ae) {
435 if (ae.getCause() instanceof BreakAttr breakAttr) {
436 return breakAttr.env;
437 } else {
438 throw ae;
439 }
440 } finally {
441 breakTree = null;
442 log.useSource(prev);
443 }
444 return env;
445 }
446
447 private JCTree breakTree = null;
448
449 private static class BreakAttr extends RuntimeException {
450 static final long serialVersionUID = -6924771130405446405L;
451 private transient Env<AttrContext> env;
452 private BreakAttr(Env<AttrContext> env) {
453 this.env = env;
454 }
455 }
456
457 /**
458 * Mode controlling behavior of Attr.Check
459 */
460 enum CheckMode {
461
462 NORMAL,
463
464 /**
465 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
466 * that the captured var cache in {@code InferenceContext} will be used in read-only
467 * mode when performing inference checks.
468 */
469 NO_TREE_UPDATE {
470 @Override
471 public boolean updateTreeType() {
472 return false;
473 }
474 },
475 /**
476 * Mode signalling that caller will manage free types in tree decorations.
477 */
478 NO_INFERENCE_HOOK {
479 @Override
480 public boolean installPostInferenceHook() {
481 return false;
482 }
483 };
484
485 public boolean updateTreeType() {
486 return true;
487 }
488 public boolean installPostInferenceHook() {
489 return true;
490 }
491 }
492
493
494 class ResultInfo {
495 final KindSelector pkind;
496 final Type pt;
497 final CheckContext checkContext;
498 final CheckMode checkMode;
499
500 ResultInfo(KindSelector pkind, Type pt) {
501 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
502 }
503
504 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
505 this(pkind, pt, chk.basicHandler, checkMode);
506 }
507
508 protected ResultInfo(KindSelector pkind,
509 Type pt, CheckContext checkContext) {
510 this(pkind, pt, checkContext, CheckMode.NORMAL);
511 }
512
513 protected ResultInfo(KindSelector pkind,
514 Type pt, CheckContext checkContext, CheckMode checkMode) {
515 this.pkind = pkind;
516 this.pt = pt;
517 this.checkContext = checkContext;
518 this.checkMode = checkMode;
519 }
520
521 /**
522 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
523 * @param tree The tree to be type-checked.
524 * @return true if {@code ArgumentAttr} should be used.
525 */
526 protected boolean needsArgumentAttr(JCTree tree) { return false; }
527
528 protected Type check(final DiagnosticPosition pos, final Type found) {
529 return chk.checkType(pos, found, pt, checkContext);
530 }
531
532 protected ResultInfo dup(Type newPt) {
533 return new ResultInfo(pkind, newPt, checkContext, checkMode);
534 }
535
536 protected ResultInfo dup(CheckContext newContext) {
537 return new ResultInfo(pkind, pt, newContext, checkMode);
538 }
539
540 protected ResultInfo dup(Type newPt, CheckContext newContext) {
541 return new ResultInfo(pkind, newPt, newContext, checkMode);
542 }
543
544 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
545 return new ResultInfo(pkind, newPt, newContext, newMode);
546 }
547
548 protected ResultInfo dup(CheckMode newMode) {
549 return new ResultInfo(pkind, pt, checkContext, newMode);
550 }
551
552 @Override
553 public String toString() {
554 if (pt != null) {
555 return pt.toString();
556 } else {
557 return "";
558 }
559 }
560 }
561
562 class MethodAttrInfo extends ResultInfo {
563 public MethodAttrInfo() {
564 this(chk.basicHandler);
565 }
566
567 public MethodAttrInfo(CheckContext checkContext) {
568 super(KindSelector.VAL, Infer.anyPoly, checkContext);
569 }
570
571 @Override
572 protected boolean needsArgumentAttr(JCTree tree) {
573 return true;
574 }
575
576 protected ResultInfo dup(Type newPt) {
577 throw new IllegalStateException();
578 }
579
580 protected ResultInfo dup(CheckContext newContext) {
581 return new MethodAttrInfo(newContext);
582 }
583
584 protected ResultInfo dup(Type newPt, CheckContext newContext) {
585 throw new IllegalStateException();
586 }
587
588 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
589 throw new IllegalStateException();
590 }
591
592 protected ResultInfo dup(CheckMode newMode) {
593 throw new IllegalStateException();
594 }
595 }
596
597 class RecoveryInfo extends ResultInfo {
598
599 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
600 this(deferredAttrContext, Type.recoveryType);
601 }
602
603 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
604 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
605 @Override
606 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
607 return deferredAttrContext;
608 }
609 @Override
610 public boolean compatible(Type found, Type req, Warner warn) {
611 return true;
612 }
613 @Override
614 public void report(DiagnosticPosition pos, JCDiagnostic details) {
615 boolean needsReport = pt == Type.recoveryType ||
616 (details.getDiagnosticPosition() != null &&
617 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
618 if (needsReport) {
619 chk.basicHandler.report(pos, details);
620 }
621 }
622 });
623 }
624 }
625
626 final ResultInfo statInfo;
627 final ResultInfo varAssignmentInfo;
628 final ResultInfo methodAttrInfo;
629 final ResultInfo unknownExprInfo;
630 final ResultInfo unknownTypeInfo;
631 final ResultInfo unknownTypeExprInfo;
632 final ResultInfo recoveryInfo;
633 final MethodType initBlockType;
634
635 Type pt() {
636 return resultInfo.pt;
637 }
638
639 KindSelector pkind() {
640 return resultInfo.pkind;
641 }
642
643 /* ************************************************************************
644 * Visitor methods
645 *************************************************************************/
646
647 /** Visitor argument: the current environment.
648 */
649 Env<AttrContext> env;
650
651 /** Visitor argument: the currently expected attribution result.
652 */
653 ResultInfo resultInfo;
654
655 /** Visitor result: the computed type.
656 */
657 Type result;
658
659 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
660
661 /** Visitor method: attribute a tree, catching any completion failure
662 * exceptions. Return the tree's type.
663 *
664 * @param tree The tree to be visited.
665 * @param env The environment visitor argument.
666 * @param resultInfo The result info visitor argument.
667 */
668 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
669 Env<AttrContext> prevEnv = this.env;
670 ResultInfo prevResult = this.resultInfo;
671 try {
672 this.env = env;
673 this.resultInfo = resultInfo;
674 if (resultInfo.needsArgumentAttr(tree)) {
675 result = argumentAttr.attribArg(tree, env);
676 } else {
677 tree.accept(this);
678 }
679 matchBindings = matchBindingsComputer.finishBindings(tree,
680 matchBindings);
681 if (tree == breakTree &&
682 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
683 breakTreeFound(copyEnv(env));
684 }
685 return result;
686 } catch (CompletionFailure ex) {
687 tree.type = syms.errType;
688 return chk.completionError(tree.pos(), ex);
689 } finally {
690 this.env = prevEnv;
691 this.resultInfo = prevResult;
692 }
693 }
694
695 protected void breakTreeFound(Env<AttrContext> env) {
696 throw new BreakAttr(env);
697 }
698
699 Env<AttrContext> copyEnv(Env<AttrContext> env) {
700 Env<AttrContext> newEnv =
701 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
702 if (newEnv.outer != null) {
703 newEnv.outer = copyEnv(newEnv.outer);
704 }
705 return newEnv;
706 }
707
708 WriteableScope copyScope(WriteableScope sc) {
709 WriteableScope newScope = WriteableScope.create(sc.owner);
710 List<Symbol> elemsList = List.nil();
711 for (Symbol sym : sc.getSymbols()) {
712 elemsList = elemsList.prepend(sym);
713 }
714 for (Symbol s : elemsList) {
715 newScope.enter(s);
716 }
717 return newScope;
718 }
719
720 /** Derived visitor method: attribute an expression tree.
721 */
722 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
723 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
724 }
725
726 /** Derived visitor method: attribute an expression tree with
727 * no constraints on the computed type.
728 */
729 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
730 return attribTree(tree, env, unknownExprInfo);
731 }
732
733 /** Derived visitor method: attribute a type tree.
734 */
735 public Type attribType(JCTree tree, Env<AttrContext> env) {
736 Type result = attribType(tree, env, Type.noType);
737 return result;
738 }
739
740 /** Derived visitor method: attribute a type tree.
741 */
742 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
743 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
744 return result;
745 }
746
747 /** Derived visitor method: attribute a statement or definition tree.
748 */
749 public Type attribStat(JCTree tree, Env<AttrContext> env) {
750 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
751 Type result = attribTree(tree, env, statInfo);
752 analyzer.analyzeIfNeeded(tree, analyzeEnv);
753 attrRecover.doRecovery();
754 return result;
755 }
756
757 /** Attribute a list of expressions, returning a list of types.
758 */
759 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
760 ListBuffer<Type> ts = new ListBuffer<>();
761 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
762 ts.append(attribExpr(l.head, env, pt));
763 return ts.toList();
764 }
765
766 /** Attribute a list of statements, returning nothing.
767 */
768 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
769 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
770 attribStat(l.head, env);
771 }
772
773 /** Attribute the arguments in a method call, returning the method kind.
774 */
775 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
776 KindSelector kind = initialKind;
777 for (JCExpression arg : trees) {
778 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
779 if (argtype.hasTag(DEFERRED)) {
780 kind = KindSelector.of(KindSelector.POLY, kind);
781 }
782 argtypes.append(argtype);
783 }
784 return kind;
785 }
786
787 /** Attribute a type argument list, returning a list of types.
788 * Caller is responsible for calling checkRefTypes.
789 */
790 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
791 ListBuffer<Type> argtypes = new ListBuffer<>();
792 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
793 argtypes.append(attribType(l.head, env));
794 return argtypes.toList();
795 }
796
797 /** Attribute a type argument list, returning a list of types.
798 * Check that all the types are references.
799 */
800 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
801 List<Type> types = attribAnyTypes(trees, env);
802 return chk.checkRefTypes(trees, types);
803 }
804
805 /**
806 * Attribute type variables (of generic classes or methods).
807 * Compound types are attributed later in attribBounds.
808 * @param typarams the type variables to enter
809 * @param env the current environment
810 */
811 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
812 for (JCTypeParameter tvar : typarams) {
813 TypeVar a = (TypeVar)tvar.type;
814 a.tsym.flags_field |= UNATTRIBUTED;
815 a.setUpperBound(Type.noType);
816 if (!tvar.bounds.isEmpty()) {
817 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
818 for (JCExpression bound : tvar.bounds.tail)
819 bounds = bounds.prepend(attribType(bound, env));
820 types.setBounds(a, bounds.reverse());
821 } else {
822 // if no bounds are given, assume a single bound of
823 // java.lang.Object.
824 types.setBounds(a, List.of(syms.objectType));
825 }
826 a.tsym.flags_field &= ~UNATTRIBUTED;
827 }
828 if (checkCyclic) {
829 for (JCTypeParameter tvar : typarams) {
830 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
831 }
832 }
833 }
834
835 /**
836 * Attribute the type references in a list of annotations.
837 */
838 void attribAnnotationTypes(List<JCAnnotation> annotations,
839 Env<AttrContext> env) {
840 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
841 JCAnnotation a = al.head;
842 attribType(a.annotationType, env);
843 }
844 }
845
846 /**
847 * Attribute a "lazy constant value".
848 * @param env The env for the const value
849 * @param variable The initializer for the const value
850 * @param type The expected type, or null
851 * @see VarSymbol#setLazyConstValue
852 */
853 public Object attribLazyConstantValue(Env<AttrContext> env,
854 Env<AttrContext> enclosingEnv,
855 JCVariableDecl variable,
856 Type type) {
857 deferredLintHandler.push(variable);
858 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
859 try {
860 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
861 Type itype = attribExpr(variable.init, env, type);
862 if (variable.isImplicitlyTyped()) {
863 //fixup local variable type
864 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
865 }
866 if (itype.constValue() != null) {
867 return coerce(itype, type).constValue();
868 } else {
869 return null;
870 }
871 } finally {
872 log.useSource(prevSource);
873 deferredLintHandler.pop();
874 }
875 }
876
877 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
878 * Supertypes of anonymous inner classes are usually already attributed.
879 *
880 * @param tree The tree making up the type reference.
881 * @param env The environment current at the reference.
882 * @param classExpected true if only a class is expected here.
883 * @param interfaceExpected true if only an interface is expected here.
884 */
885 Type attribBase(JCTree tree,
886 Env<AttrContext> env,
887 boolean classExpected,
888 boolean interfaceExpected,
889 boolean checkExtensible) {
890 Type t = tree.type != null ?
891 tree.type :
892 attribType(tree, env);
893 try {
894 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
895 } catch (CompletionFailure ex) {
896 chk.completionError(tree.pos(), ex);
897 return t;
898 }
899 }
900 Type checkBase(Type t,
901 JCTree tree,
902 Env<AttrContext> env,
903 boolean classExpected,
904 boolean interfaceExpected,
905 boolean checkExtensible) {
906 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
907 (((JCTypeApply) tree).clazz).pos() : tree.pos();
908 if (t.tsym.isAnonymous()) {
909 log.error(pos, Errors.CantInheritFromAnon);
910 return types.createErrorType(t);
911 }
912 if (t.isErroneous())
913 return t;
914 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
915 // check that type variable is already visible
916 if (t.getUpperBound() == null) {
917 log.error(pos, Errors.IllegalForwardRef);
918 return types.createErrorType(t);
919 }
920 } else {
921 t = chk.checkClassType(pos, t, checkExtensible);
922 }
923 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
924 log.error(pos, Errors.IntfExpectedHere);
925 // return errType is necessary since otherwise there might
926 // be undetected cycles which cause attribution to loop
927 return types.createErrorType(t);
928 } else if (checkExtensible &&
929 classExpected &&
930 (t.tsym.flags() & INTERFACE) != 0) {
931 log.error(pos, Errors.NoIntfExpectedHere);
932 return types.createErrorType(t);
933 }
934 if (checkExtensible &&
935 ((t.tsym.flags() & FINAL) != 0)) {
936 log.error(pos,
937 Errors.CantInheritFromFinal(t.tsym));
938 }
939 chk.checkNonCyclic(pos, t);
940 return t;
941 }
942
943 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
944 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
945 id.type = env.info.scope.owner.enclClass().type;
946 id.sym = env.info.scope.owner.enclClass();
947 return id.type;
948 }
949
950 public void visitClassDef(JCClassDecl tree) {
951 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
952 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
953 argumentAttr.withLocalCacheContext() : null);
954 boolean ctorProloguePrev = env.info.ctorPrologue;
955 try {
956 // Local and anonymous classes have not been entered yet, so we need to
957 // do it now.
958 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
959 enter.classEnter(tree, env);
960 } else {
961 // If this class declaration is part of a class level annotation,
962 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
963 // order to simplify later steps and allow for sensible error
964 // messages.
965 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
966 enter.classEnter(tree, env);
967 }
968
969 ClassSymbol c = tree.sym;
970 if (c == null) {
971 // exit in case something drastic went wrong during enter.
972 result = null;
973 } else {
974 // make sure class has been completed:
975 c.complete();
976
977 // If a class declaration appears in a constructor prologue,
978 // that means it's either a local class or an anonymous class.
979 // Either way, there is no immediately enclosing instance.
980 if (ctorProloguePrev) {
981 c.flags_field |= NOOUTERTHIS;
982 }
983 attribClass(tree.pos(), c);
984 result = tree.type = c.type;
985 }
986 } finally {
987 localCacheContext.ifPresent(LocalCacheContext::leave);
988 env.info.ctorPrologue = ctorProloguePrev;
989 }
990 }
991
992 public void visitMethodDef(JCMethodDecl tree) {
993 MethodSymbol m = tree.sym;
994 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
995
996 Lint lint = env.info.lint.augment(m);
997 Lint prevLint = chk.setLint(lint);
998 boolean ctorProloguePrev = env.info.ctorPrologue;
999 Assert.check(!env.info.ctorPrologue);
1000 MethodSymbol prevMethod = chk.setMethod(m);
1001 try {
1002 deferredLintHandler.flush(tree, lint);
1003 chk.checkDeprecatedAnnotation(tree.pos(), m);
1004
1005
1006 // Create a new environment with local scope
1007 // for attributing the method.
1008 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1009 localEnv.info.lint = lint;
1010
1011 attribStats(tree.typarams, localEnv);
1012
1013 // If we override any other methods, check that we do so properly.
1014 // JLS ???
1015 if (m.isStatic()) {
1016 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1017 } else {
1018 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1019 }
1020 chk.checkOverride(env, tree, m);
1021
1022 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1023 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1024 }
1025
1026 // Enter all type parameters into the local method scope.
1027 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1028 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1029
1030 ClassSymbol owner = env.enclClass.sym;
1031 if ((owner.flags() & ANNOTATION) != 0 &&
1032 (tree.params.nonEmpty() ||
1033 tree.recvparam != null))
1034 log.error(tree.params.nonEmpty() ?
1035 tree.params.head.pos() :
1036 tree.recvparam.pos(),
1037 Errors.IntfAnnotationMembersCantHaveParams);
1038
1039 // Attribute all value parameters.
1040 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1041 attribStat(l.head, localEnv);
1042 }
1043
1044 chk.checkVarargsMethodDecl(localEnv, tree);
1045
1046 // Check that type parameters are well-formed.
1047 chk.validate(tree.typarams, localEnv);
1048
1049 // Check that result type is well-formed.
1050 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1051 chk.validate(tree.restype, localEnv);
1052
1053 // Check that receiver type is well-formed.
1054 if (tree.recvparam != null) {
1055 // Use a new environment to check the receiver parameter.
1056 // Otherwise I get "might not have been initialized" errors.
1057 // Is there a better way?
1058 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1059 attribType(tree.recvparam, newEnv);
1060 chk.validate(tree.recvparam, newEnv);
1061 }
1062
1063 // Is this method a constructor?
1064 boolean isConstructor = TreeInfo.isConstructor(tree);
1065
1066 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1067 // lets find if this method is an accessor
1068 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1069 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1070 if (recordComponent.isPresent()) {
1071 // the method is a user defined accessor lets check that everything is fine
1072 if (!tree.sym.isPublic()) {
1073 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1074 }
1075 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1076 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1077 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1078 }
1079 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1080 log.error(tree,
1081 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1082 }
1083 if (!tree.typarams.isEmpty()) {
1084 log.error(tree,
1085 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1086 }
1087 if (tree.sym.isStatic()) {
1088 log.error(tree,
1089 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1090 }
1091 }
1092
1093 if (isConstructor) {
1094 // if this a constructor other than the canonical one
1095 if ((tree.sym.flags_field & RECORD) == 0) {
1096 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1097 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1098 }
1099 } else {
1100 // but if it is the canonical:
1101
1102 /* if user generated, then it shouldn't:
1103 * - have an accessibility stricter than that of the record type
1104 * - explicitly invoke any other constructor
1105 */
1106 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1107 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1108 log.error(tree,
1109 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1110 Errors.InvalidCanonicalConstructorInRecord(
1111 Fragments.Canonical,
1112 env.enclClass.sym.name,
1113 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1114 ) :
1115 Errors.InvalidCanonicalConstructorInRecord(
1116 Fragments.Canonical,
1117 env.enclClass.sym.name,
1118 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1119 )
1120 );
1121 }
1122
1123 if (TreeInfo.hasAnyConstructorCall(tree)) {
1124 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1125 Fragments.Canonical, env.enclClass.sym.name,
1126 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1127 }
1128 }
1129
1130 // also we want to check that no type variables have been defined
1131 if (!tree.typarams.isEmpty()) {
1132 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1133 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1134 }
1135
1136 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1137 * record components
1138 */
1139 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1140 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1141 for (JCVariableDecl param: tree.params) {
1142 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1143 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1144 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1145 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1146 Fragments.Canonical, env.enclClass.sym.name,
1147 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1148 }
1149 recordComponents = recordComponents.tail;
1150 recordFieldTypes = recordFieldTypes.tail;
1151 }
1152 }
1153 }
1154 }
1155
1156 // annotation method checks
1157 if ((owner.flags() & ANNOTATION) != 0) {
1158 // annotation method cannot have throws clause
1159 if (tree.thrown.nonEmpty()) {
1160 log.error(tree.thrown.head.pos(),
1161 Errors.ThrowsNotAllowedInIntfAnnotation);
1162 }
1163 // annotation method cannot declare type-parameters
1164 if (tree.typarams.nonEmpty()) {
1165 log.error(tree.typarams.head.pos(),
1166 Errors.IntfAnnotationMembersCantHaveTypeParams);
1167 }
1168 // validate annotation method's return type (could be an annotation type)
1169 chk.validateAnnotationType(tree.restype);
1170 // ensure that annotation method does not clash with members of Object/Annotation
1171 chk.validateAnnotationMethod(tree.pos(), m);
1172 }
1173
1174 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1175 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1176
1177 if (tree.body == null) {
1178 // Empty bodies are only allowed for
1179 // abstract, native, or interface methods, or for methods
1180 // in a retrofit signature class.
1181 if (tree.defaultValue != null) {
1182 if ((owner.flags() & ANNOTATION) == 0)
1183 log.error(tree.pos(),
1184 Errors.DefaultAllowedInIntfAnnotationMember);
1185 }
1186 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1187 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1188 } else {
1189 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1190 if ((owner.flags() & INTERFACE) != 0) {
1191 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1192 } else {
1193 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1194 }
1195 } else if ((tree.mods.flags & NATIVE) != 0) {
1196 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1197 }
1198 // Add an implicit super() call unless an explicit call to
1199 // super(...) or this(...) is given
1200 // or we are compiling class java.lang.Object.
1201 if (isConstructor && owner.type != syms.objectType) {
1202 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1203 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1204 make.Ident(names._super), make.Idents(List.nil())));
1205 if (owner.isValueClass() || owner.hasStrict()) {
1206 tree.body.stats = tree.body.stats.append(supCall);
1207 } else {
1208 tree.body.stats = tree.body.stats.prepend(supCall);
1209 }
1210 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1211 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1212 TreeInfo.hasConstructorCall(tree, names._super)) {
1213 // enum constructors are not allowed to call super
1214 // directly, so make sure there aren't any super calls
1215 // in enum constructors, except in the compiler
1216 // generated one.
1217 log.error(tree.body.stats.head.pos(),
1218 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1219 }
1220 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1221 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1222 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1223 if (!initParamNames.equals(recordComponentNames)) {
1224 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1225 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1226 }
1227 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1228 log.error(tree,
1229 Errors.InvalidCanonicalConstructorInRecord(
1230 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1231 env.enclClass.sym.name,
1232 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1233 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1234 }
1235 }
1236 }
1237
1238 // Attribute all type annotations in the body
1239 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1240 annotate.flush();
1241
1242 // Start of constructor prologue
1243 localEnv.info.ctorPrologue = isConstructor;
1244
1245 // Attribute method body.
1246 attribStat(tree.body, localEnv);
1247 }
1248
1249 localEnv.info.scope.leave();
1250 result = tree.type = m.type;
1251 } finally {
1252 chk.setLint(prevLint);
1253 chk.setMethod(prevMethod);
1254 env.info.ctorPrologue = ctorProloguePrev;
1255 }
1256 }
1257
1258 public void visitVarDef(JCVariableDecl tree) {
1259 // Local variables have not been entered yet, so we need to do it now:
1260 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1261 if (tree.sym != null) {
1262 // parameters have already been entered
1263 env.info.scope.enter(tree.sym);
1264 } else {
1265 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1266 if (tree.init == null) {
1267 //cannot use 'var' without initializer
1268 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1269 tree.vartype = make.Erroneous();
1270 } else {
1271 Fragment msg = canInferLocalVarType(tree);
1272 if (msg != null) {
1273 //cannot use 'var' with initializer which require an explicit target
1274 //(e.g. lambda, method reference, array initializer).
1275 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1276 tree.vartype = make.Erroneous();
1277 }
1278 }
1279 }
1280 try {
1281 annotate.blockAnnotations();
1282 memberEnter.memberEnter(tree, env);
1283 } finally {
1284 annotate.unblockAnnotations();
1285 }
1286 }
1287 } else {
1288 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1289 }
1290
1291 VarSymbol v = tree.sym;
1292 Lint lint = env.info.lint.augment(v);
1293 Lint prevLint = chk.setLint(lint);
1294
1295 // Check that the variable's declared type is well-formed.
1296 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1297 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1298 (tree.sym.flags() & PARAMETER) != 0;
1299 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1300
1301 try {
1302 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1303 deferredLintHandler.flush(tree, lint);
1304 chk.checkDeprecatedAnnotation(tree.pos(), v);
1305
1306 if (tree.init != null) {
1307 if ((v.flags_field & FINAL) == 0 ||
1308 !memberEnter.needsLazyConstValue(tree.init)) {
1309 // Not a compile-time constant
1310 // Attribute initializer in a new environment
1311 // with the declared variable as owner.
1312 // Check that initializer conforms to variable's declared type.
1313 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1314 initEnv.info.lint = lint;
1315 // In order to catch self-references, we set the variable's
1316 // declaration position to maximal possible value, effectively
1317 // marking the variable as undefined.
1318 initEnv.info.enclVar = v;
1319 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1320 try {
1321 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1322 // strict instance initializer in a value class
1323 initEnv.info.ctorPrologue = true;
1324 }
1325 attribExpr(tree.init, initEnv, v.type);
1326 if (tree.isImplicitlyTyped()) {
1327 //fixup local variable type
1328 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1329 }
1330 } finally {
1331 initEnv.info.ctorPrologue = previousCtorPrologue;
1332 }
1333 }
1334 if (tree.isImplicitlyTyped()) {
1335 setSyntheticVariableType(tree, v.type);
1336 }
1337 }
1338 result = tree.type = v.type;
1339 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1340 if (isNonArgsMethodInObject(v.name)) {
1341 log.error(tree, Errors.IllegalRecordComponentName(v));
1342 }
1343 }
1344 }
1345 finally {
1346 chk.setLint(prevLint);
1347 }
1348 }
1349
1350 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1351 if (tree.init != null &&
1352 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1353 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1354 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1355 // Field initializer expression need to be entered.
1356 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree);
1357 annotate.flush();
1358 }
1359 }
1360
1361 private boolean isNonArgsMethodInObject(Name name) {
1362 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1363 if (s.type.getParameterTypes().isEmpty()) {
1364 return true;
1365 }
1366 }
1367 return false;
1368 }
1369
1370 Fragment canInferLocalVarType(JCVariableDecl tree) {
1371 LocalInitScanner lis = new LocalInitScanner();
1372 lis.scan(tree.init);
1373 return lis.badInferenceMsg;
1374 }
1375
1376 static class LocalInitScanner extends TreeScanner {
1377 Fragment badInferenceMsg = null;
1378 boolean needsTarget = true;
1379
1380 @Override
1381 public void visitNewArray(JCNewArray tree) {
1382 if (tree.elemtype == null && needsTarget) {
1383 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1384 }
1385 }
1386
1387 @Override
1388 public void visitLambda(JCLambda tree) {
1389 if (needsTarget) {
1390 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1391 }
1392 }
1393
1394 @Override
1395 public void visitTypeCast(JCTypeCast tree) {
1396 boolean prevNeedsTarget = needsTarget;
1397 try {
1398 needsTarget = false;
1399 super.visitTypeCast(tree);
1400 } finally {
1401 needsTarget = prevNeedsTarget;
1402 }
1403 }
1404
1405 @Override
1406 public void visitReference(JCMemberReference tree) {
1407 if (needsTarget) {
1408 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1409 }
1410 }
1411
1412 @Override
1413 public void visitNewClass(JCNewClass tree) {
1414 boolean prevNeedsTarget = needsTarget;
1415 try {
1416 needsTarget = false;
1417 super.visitNewClass(tree);
1418 } finally {
1419 needsTarget = prevNeedsTarget;
1420 }
1421 }
1422
1423 @Override
1424 public void visitApply(JCMethodInvocation tree) {
1425 boolean prevNeedsTarget = needsTarget;
1426 try {
1427 needsTarget = false;
1428 super.visitApply(tree);
1429 } finally {
1430 needsTarget = prevNeedsTarget;
1431 }
1432 }
1433 }
1434
1435 public void visitSkip(JCSkip tree) {
1436 result = null;
1437 }
1438
1439 public void visitBlock(JCBlock tree) {
1440 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1441 // Block is a static or instance initializer;
1442 // let the owner of the environment be a freshly
1443 // created BLOCK-method.
1444 Symbol fakeOwner =
1445 new MethodSymbol(tree.flags | BLOCK |
1446 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1447 env.info.scope.owner);
1448 final Env<AttrContext> localEnv =
1449 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1450
1451 if ((tree.flags & STATIC) != 0) {
1452 localEnv.info.staticLevel++;
1453 } else {
1454 localEnv.info.instanceInitializerBlock = true;
1455 }
1456 // Attribute all type annotations in the block
1457 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1458 annotate.flush();
1459 attribStats(tree.stats, localEnv);
1460
1461 {
1462 // Store init and clinit type annotations with the ClassSymbol
1463 // to allow output in Gen.normalizeDefs.
1464 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1465 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1466 if ((tree.flags & STATIC) != 0) {
1467 cs.appendClassInitTypeAttributes(tas);
1468 } else {
1469 cs.appendInitTypeAttributes(tas);
1470 }
1471 }
1472 } else {
1473 // Create a new local environment with a local scope.
1474 Env<AttrContext> localEnv =
1475 env.dup(tree, env.info.dup(env.info.scope.dup()));
1476 try {
1477 attribStats(tree.stats, localEnv);
1478 } finally {
1479 localEnv.info.scope.leave();
1480 }
1481 }
1482 result = null;
1483 }
1484
1485 public void visitDoLoop(JCDoWhileLoop tree) {
1486 attribStat(tree.body, env.dup(tree));
1487 attribExpr(tree.cond, env, syms.booleanType);
1488 handleLoopConditionBindings(matchBindings, tree, tree.body);
1489 result = null;
1490 }
1491
1492 public void visitWhileLoop(JCWhileLoop tree) {
1493 attribExpr(tree.cond, env, syms.booleanType);
1494 MatchBindings condBindings = matchBindings;
1495 // include condition's bindings when true in the body:
1496 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1497 try {
1498 attribStat(tree.body, whileEnv.dup(tree));
1499 } finally {
1500 whileEnv.info.scope.leave();
1501 }
1502 handleLoopConditionBindings(condBindings, tree, tree.body);
1503 result = null;
1504 }
1505
1506 public void visitForLoop(JCForLoop tree) {
1507 Env<AttrContext> loopEnv =
1508 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1509 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1510 try {
1511 attribStats(tree.init, loopEnv);
1512 if (tree.cond != null) {
1513 attribExpr(tree.cond, loopEnv, syms.booleanType);
1514 // include condition's bindings when true in the body and step:
1515 condBindings = matchBindings;
1516 }
1517 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1518 try {
1519 bodyEnv.tree = tree; // before, we were not in loop!
1520 attribStats(tree.step, bodyEnv);
1521 attribStat(tree.body, bodyEnv);
1522 } finally {
1523 bodyEnv.info.scope.leave();
1524 }
1525 result = null;
1526 }
1527 finally {
1528 loopEnv.info.scope.leave();
1529 }
1530 handleLoopConditionBindings(condBindings, tree, tree.body);
1531 }
1532
1533 /**
1534 * Include condition's bindings when false after the loop, if cannot get out of the loop
1535 */
1536 private void handleLoopConditionBindings(MatchBindings condBindings,
1537 JCStatement loop,
1538 JCStatement loopBody) {
1539 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1540 !breaksTo(env, loop, loopBody)) {
1541 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1542 }
1543 }
1544
1545 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1546 preFlow(body);
1547 return flow.breaksToTree(env, loop, body, make);
1548 }
1549
1550 /**
1551 * Add given bindings to the current scope, unless there's a break to
1552 * an immediately enclosing labeled statement.
1553 */
1554 private void addBindings2Scope(JCStatement introducingStatement,
1555 List<BindingSymbol> bindings) {
1556 if (bindings.isEmpty()) {
1557 return ;
1558 }
1559
1560 var searchEnv = env;
1561 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1562 labeled.body == introducingStatement) {
1563 if (breaksTo(env, labeled, labeled.body)) {
1564 //breaking to an immediately enclosing labeled statement
1565 return ;
1566 }
1567 searchEnv = searchEnv.next;
1568 introducingStatement = labeled;
1569 }
1570
1571 //include condition's body when false after the while, if cannot get out of the loop
1572 bindings.forEach(env.info.scope::enter);
1573 bindings.forEach(BindingSymbol::preserveBinding);
1574 }
1575
1576 public void visitForeachLoop(JCEnhancedForLoop tree) {
1577 Env<AttrContext> loopEnv =
1578 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1579 try {
1580 //the Formal Parameter of a for-each loop is not in the scope when
1581 //attributing the for-each expression; we mimic this by attributing
1582 //the for-each expression first (against original scope).
1583 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1584 chk.checkNonVoid(tree.pos(), exprType);
1585 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1586 if (elemtype == null) {
1587 // or perhaps expr implements Iterable<T>?
1588 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1589 if (base == null) {
1590 log.error(tree.expr.pos(),
1591 Errors.ForeachNotApplicableToType(exprType,
1592 Fragments.TypeReqArrayOrIterable));
1593 elemtype = types.createErrorType(exprType);
1594 } else {
1595 List<Type> iterableParams = base.allparams();
1596 elemtype = iterableParams.isEmpty()
1597 ? syms.objectType
1598 : types.wildUpperBound(iterableParams.head);
1599
1600 // Check the return type of the method iterator().
1601 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1602 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1603 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1604 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1605 log.error(tree.pos(),
1606 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1607 }
1608 }
1609 }
1610 if (tree.var.isImplicitlyTyped()) {
1611 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1612 setSyntheticVariableType(tree.var, inferredType);
1613 }
1614 attribStat(tree.var, loopEnv);
1615 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1616 loopEnv.tree = tree; // before, we were not in loop!
1617 attribStat(tree.body, loopEnv);
1618 result = null;
1619 }
1620 finally {
1621 loopEnv.info.scope.leave();
1622 }
1623 }
1624
1625 public void visitLabelled(JCLabeledStatement tree) {
1626 // Check that label is not used in an enclosing statement
1627 Env<AttrContext> env1 = env;
1628 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1629 if (env1.tree.hasTag(LABELLED) &&
1630 ((JCLabeledStatement) env1.tree).label == tree.label) {
1631 log.error(tree.pos(),
1632 Errors.LabelAlreadyInUse(tree.label));
1633 break;
1634 }
1635 env1 = env1.next;
1636 }
1637
1638 attribStat(tree.body, env.dup(tree));
1639 result = null;
1640 }
1641
1642 public void visitSwitch(JCSwitch tree) {
1643 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1644 attribStats(c.stats, caseEnv);
1645 });
1646 result = null;
1647 }
1648
1649 public void visitSwitchExpression(JCSwitchExpression tree) {
1650 boolean wrongContext = false;
1651
1652 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1653 PolyKind.STANDALONE : PolyKind.POLY;
1654
1655 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1656 //this means we are returning a poly conditional from void-compatible lambda expression
1657 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1658 resultInfo = recoveryInfo;
1659 wrongContext = true;
1660 }
1661
1662 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1663 unknownExprInfo :
1664 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1665
1666 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1667 ListBuffer<Type> caseTypes = new ListBuffer<>();
1668
1669 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1670 caseEnv.info.yieldResult = condInfo;
1671 attribStats(c.stats, caseEnv);
1672 new TreeScanner() {
1673 @Override
1674 public void visitYield(JCYield brk) {
1675 if (brk.target == tree) {
1676 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1677 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1678 }
1679 super.visitYield(brk);
1680 }
1681
1682 @Override public void visitClassDef(JCClassDecl tree) {}
1683 @Override public void visitLambda(JCLambda tree) {}
1684 }.scan(c.stats);
1685 });
1686
1687 if (tree.cases.isEmpty()) {
1688 log.error(tree.pos(),
1689 Errors.SwitchExpressionEmpty);
1690 } else if (caseTypes.isEmpty()) {
1691 log.error(tree.pos(),
1692 Errors.SwitchExpressionNoResultExpressions);
1693 }
1694
1695 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1696
1697 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1698 }
1699 //where:
1700 CheckContext switchExpressionContext(CheckContext checkContext) {
1701 return new Check.NestedCheckContext(checkContext) {
1702 //this will use enclosing check context to check compatibility of
1703 //subexpression against target type; if we are in a method check context,
1704 //depending on whether boxing is allowed, we could have incompatibilities
1705 @Override
1706 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1707 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1708 }
1709 };
1710 }
1711
1712 private void handleSwitch(JCTree switchTree,
1713 JCExpression selector,
1714 List<JCCase> cases,
1715 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1716 Type seltype = attribExpr(selector, env);
1717
1718 Env<AttrContext> switchEnv =
1719 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1720
1721 try {
1722 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1723 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1724 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1725 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1726 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1727 boolean patternSwitch;
1728 if (seltype.isPrimitive() && !intSwitch) {
1729 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1730 patternSwitch = true;
1731 }
1732 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1733 !intSwitch) {
1734 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1735 patternSwitch = true;
1736 } else {
1737 patternSwitch = cases.stream()
1738 .flatMap(c -> c.labels.stream())
1739 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1740 TreeInfo.isNullCaseLabel(l));
1741 }
1742
1743 // Attribute all cases and
1744 // check that there are no duplicate case labels or default clauses.
1745 Set<Object> constants = new HashSet<>(); // The set of case constants.
1746 boolean hasDefault = false; // Is there a default label?
1747 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1748 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1749 boolean hasNullPattern = false; // Is there a null pattern?
1750 CaseTree.CaseKind caseKind = null;
1751 boolean wasError = false;
1752 JCCaseLabel unconditionalCaseLabel = null;
1753 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1754 JCCase c = l.head;
1755 if (caseKind == null) {
1756 caseKind = c.caseKind;
1757 } else if (caseKind != c.caseKind && !wasError) {
1758 log.error(c.pos(),
1759 Errors.SwitchMixingCaseTypes);
1760 wasError = true;
1761 }
1762 MatchBindings currentBindings = null;
1763 MatchBindings guardBindings = null;
1764 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1765 JCCaseLabel label = labels.head;
1766 if (label instanceof JCConstantCaseLabel constLabel) {
1767 JCExpression expr = constLabel.expr;
1768 if (TreeInfo.isNull(expr)) {
1769 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1770 if (hasNullPattern) {
1771 log.error(label.pos(), Errors.DuplicateCaseLabel);
1772 }
1773 hasNullPattern = true;
1774 attribExpr(expr, switchEnv, seltype);
1775 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1776 } else if (enumSwitch) {
1777 Symbol sym = enumConstant(expr, seltype);
1778 if (sym == null) {
1779 if (allowPatternSwitch) {
1780 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1781 Symbol enumSym = TreeInfo.symbol(expr);
1782 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1783 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1784 } else if (!constants.add(enumSym)) {
1785 log.error(label.pos(), Errors.DuplicateCaseLabel);
1786 }
1787 } else {
1788 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1789 }
1790 } else if (!constants.add(sym)) {
1791 log.error(label.pos(), Errors.DuplicateCaseLabel);
1792 }
1793 } else if (errorEnumSwitch) {
1794 //error recovery: the selector is erroneous, and all the case labels
1795 //are identifiers. This could be an enum switch - don't report resolve
1796 //error for the case label:
1797 var prevResolveHelper = rs.basicLogResolveHelper;
1798 try {
1799 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1800 attribExpr(expr, switchEnv, seltype);
1801 } finally {
1802 rs.basicLogResolveHelper = prevResolveHelper;
1803 }
1804 } else {
1805 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1806 if (!pattype.hasTag(ERROR)) {
1807 if (pattype.constValue() == null) {
1808 Symbol s = TreeInfo.symbol(expr);
1809 if (s != null && s.kind == TYP) {
1810 log.error(expr.pos(),
1811 Errors.PatternExpected);
1812 } else if (s == null || !s.isEnum()) {
1813 log.error(expr.pos(),
1814 (stringSwitch ? Errors.StringConstReq
1815 : intSwitch ? Errors.ConstExprReq
1816 : Errors.PatternOrEnumReq));
1817 } else if (!constants.add(s)) {
1818 log.error(label.pos(), Errors.DuplicateCaseLabel);
1819 }
1820 }
1821 else {
1822 if (!stringSwitch && !intSwitch &&
1823 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1824 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1825 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1826 } else if (!constants.add(pattype.constValue())) {
1827 log.error(c.pos(), Errors.DuplicateCaseLabel);
1828 }
1829 }
1830 }
1831 }
1832 } else if (label instanceof JCDefaultCaseLabel def) {
1833 if (hasDefault) {
1834 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1835 } else if (hasUnconditionalPattern) {
1836 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1837 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1838 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1839 }
1840 hasDefault = true;
1841 matchBindings = MatchBindingsComputer.EMPTY;
1842 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1843 //pattern
1844 JCPattern pat = patternlabel.pat;
1845 attribExpr(pat, switchEnv, seltype);
1846 Type primaryType = TreeInfo.primaryPatternType(pat);
1847
1848 if (primaryType.isPrimitive()) {
1849 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1850 } else if (!primaryType.hasTag(TYPEVAR)) {
1851 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1852 }
1853 checkCastablePattern(pat.pos(), seltype, primaryType);
1854 Type patternType = types.erasure(primaryType);
1855 JCExpression guard = c.guard;
1856 if (guardBindings == null && guard != null) {
1857 MatchBindings afterPattern = matchBindings;
1858 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1859 try {
1860 attribExpr(guard, bodyEnv, syms.booleanType);
1861 } finally {
1862 bodyEnv.info.scope.leave();
1863 }
1864
1865 guardBindings = matchBindings;
1866 matchBindings = afterPattern;
1867
1868 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1869 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1870 }
1871 }
1872 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1873 boolean unconditional =
1874 unguarded &&
1875 !patternType.isErroneous() &&
1876 types.isUnconditionallyExact(seltype, patternType);
1877 if (unconditional) {
1878 if (hasUnconditionalPattern) {
1879 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1880 } else if (hasDefault) {
1881 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1882 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1883 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1884 }
1885 hasUnconditionalPattern = true;
1886 unconditionalCaseLabel = label;
1887 }
1888 lastPatternErroneous = patternType.isErroneous();
1889 } else {
1890 Assert.error();
1891 }
1892 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1893 }
1894
1895 if (guardBindings != null) {
1896 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1897 }
1898
1899 Env<AttrContext> caseEnv =
1900 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1901 try {
1902 attribCase.accept(c, caseEnv);
1903 } finally {
1904 caseEnv.info.scope.leave();
1905 }
1906 addVars(c.stats, switchEnv.info.scope);
1907
1908 preFlow(c);
1909 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1910 }
1911 if (patternSwitch) {
1912 chk.checkSwitchCaseStructure(cases);
1913 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1914 }
1915 if (switchTree.hasTag(SWITCH)) {
1916 ((JCSwitch) switchTree).hasUnconditionalPattern =
1917 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1918 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1919 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1920 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1921 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1922 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1923 } else {
1924 Assert.error(switchTree.getTag().name());
1925 }
1926 } finally {
1927 switchEnv.info.scope.leave();
1928 }
1929 }
1930 // where
1931 private ResultInfo caseLabelResultInfo(Type seltype) {
1932 return new ResultInfo(KindSelector.VAL_TYP,
1933 !seltype.hasTag(ERROR) ? seltype
1934 : Type.noType);
1935 }
1936 /** Add any variables defined in stats to the switch scope. */
1937 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1938 for (;stats.nonEmpty(); stats = stats.tail) {
1939 JCTree stat = stats.head;
1940 if (stat.hasTag(VARDEF))
1941 switchScope.enter(((JCVariableDecl) stat).sym);
1942 }
1943 }
1944 // where
1945 /** Return the selected enumeration constant symbol, or null. */
1946 private Symbol enumConstant(JCTree tree, Type enumType) {
1947 if (tree.hasTag(IDENT)) {
1948 JCIdent ident = (JCIdent)tree;
1949 Name name = ident.name;
1950 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1951 if (sym.kind == VAR) {
1952 Symbol s = ident.sym = sym;
1953 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1954 ident.type = s.type;
1955 return ((s.flags_field & Flags.ENUM) == 0)
1956 ? null : s;
1957 }
1958 }
1959 }
1960 return null;
1961 }
1962
1963 public void visitSynchronized(JCSynchronized tree) {
1964 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1965 if (identityType && isValueBased(tree.lock.type)) {
1966 env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1967 }
1968 attribStat(tree.body, env);
1969 result = null;
1970 }
1971 // where
1972 private boolean isValueBased(Type t) {
1973 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1974 }
1975
1976 public void visitTry(JCTry tree) {
1977 // Create a new local environment with a local
1978 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1979 try {
1980 boolean isTryWithResource = tree.resources.nonEmpty();
1981 // Create a nested environment for attributing the try block if needed
1982 Env<AttrContext> tryEnv = isTryWithResource ?
1983 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1984 localEnv;
1985 try {
1986 // Attribute resource declarations
1987 for (JCTree resource : tree.resources) {
1988 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1989 @Override
1990 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1991 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1992 }
1993 };
1994 ResultInfo twrResult =
1995 new ResultInfo(KindSelector.VAR,
1996 syms.autoCloseableType,
1997 twrContext);
1998 if (resource.hasTag(VARDEF)) {
1999 attribStat(resource, tryEnv);
2000 twrResult.check(resource, resource.type);
2001
2002 //check that resource type cannot throw InterruptedException
2003 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2004
2005 VarSymbol var = ((JCVariableDecl) resource).sym;
2006
2007 var.flags_field |= Flags.FINAL;
2008 var.setData(ElementKind.RESOURCE_VARIABLE);
2009 } else {
2010 attribTree(resource, tryEnv, twrResult);
2011 }
2012 }
2013 // Attribute body
2014 attribStat(tree.body, tryEnv);
2015 } finally {
2016 if (isTryWithResource)
2017 tryEnv.info.scope.leave();
2018 }
2019
2020 // Attribute catch clauses
2021 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2022 JCCatch c = l.head;
2023 Env<AttrContext> catchEnv =
2024 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2025 try {
2026 Type ctype = attribStat(c.param, catchEnv);
2027 if (TreeInfo.isMultiCatch(c)) {
2028 //multi-catch parameter is implicitly marked as final
2029 c.param.sym.flags_field |= FINAL | UNION;
2030 }
2031 if (c.param.sym.kind == VAR) {
2032 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2033 }
2034 chk.checkType(c.param.vartype.pos(),
2035 chk.checkClassType(c.param.vartype.pos(), ctype),
2036 syms.throwableType);
2037 attribStat(c.body, catchEnv);
2038 } finally {
2039 catchEnv.info.scope.leave();
2040 }
2041 }
2042
2043 // Attribute finalizer
2044 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2045 result = null;
2046 }
2047 finally {
2048 localEnv.info.scope.leave();
2049 }
2050 }
2051
2052 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2053 if (!resource.isErroneous() &&
2054 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2055 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2056 Symbol close = syms.noSymbol;
2057 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2058 try {
2059 close = rs.resolveQualifiedMethod(pos,
2060 env,
2061 types.skipTypeVars(resource, false),
2062 names.close,
2063 List.nil(),
2064 List.nil());
2065 }
2066 finally {
2067 log.popDiagnosticHandler(discardHandler);
2068 }
2069 if (close.kind == MTH &&
2070 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2071 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2072 env.info.lint.logIfEnabled(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2073 }
2074 }
2075 }
2076
2077 public void visitConditional(JCConditional tree) {
2078 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2079 MatchBindings condBindings = matchBindings;
2080
2081 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2082 isBooleanOrNumeric(env, tree)) ?
2083 PolyKind.STANDALONE : PolyKind.POLY;
2084
2085 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2086 //this means we are returning a poly conditional from void-compatible lambda expression
2087 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2088 result = tree.type = types.createErrorType(resultInfo.pt);
2089 return;
2090 }
2091
2092 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2093 unknownExprInfo :
2094 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2095
2096
2097 // x ? y : z
2098 // include x's bindings when true in y
2099 // include x's bindings when false in z
2100
2101 Type truetype;
2102 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2103 try {
2104 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2105 } finally {
2106 trueEnv.info.scope.leave();
2107 }
2108
2109 MatchBindings trueBindings = matchBindings;
2110
2111 Type falsetype;
2112 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2113 try {
2114 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2115 } finally {
2116 falseEnv.info.scope.leave();
2117 }
2118
2119 MatchBindings falseBindings = matchBindings;
2120
2121 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2122 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2123 List.of(truetype, falsetype)) : pt();
2124 if (condtype.constValue() != null &&
2125 truetype.constValue() != null &&
2126 falsetype.constValue() != null &&
2127 !owntype.hasTag(NONE)) {
2128 //constant folding
2129 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2130 }
2131 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2132 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2133 }
2134 //where
2135 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2136 switch (tree.getTag()) {
2137 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2138 ((JCLiteral)tree).typetag == BOOLEAN ||
2139 ((JCLiteral)tree).typetag == BOT;
2140 case LAMBDA: case REFERENCE: return false;
2141 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2142 case CONDEXPR:
2143 JCConditional condTree = (JCConditional)tree;
2144 return isBooleanOrNumeric(env, condTree.truepart) &&
2145 isBooleanOrNumeric(env, condTree.falsepart);
2146 case APPLY:
2147 JCMethodInvocation speculativeMethodTree =
2148 (JCMethodInvocation)deferredAttr.attribSpeculative(
2149 tree, env, unknownExprInfo,
2150 argumentAttr.withLocalCacheContext());
2151 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2152 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2153 env.enclClass.type :
2154 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2155 Type owntype = types.memberType(receiverType, msym).getReturnType();
2156 return primitiveOrBoxed(owntype);
2157 case NEWCLASS:
2158 JCExpression className =
2159 removeClassParams.translate(((JCNewClass)tree).clazz);
2160 JCExpression speculativeNewClassTree =
2161 (JCExpression)deferredAttr.attribSpeculative(
2162 className, env, unknownTypeInfo,
2163 argumentAttr.withLocalCacheContext());
2164 return primitiveOrBoxed(speculativeNewClassTree.type);
2165 default:
2166 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2167 argumentAttr.withLocalCacheContext()).type;
2168 return primitiveOrBoxed(speculativeType);
2169 }
2170 }
2171 //where
2172 boolean primitiveOrBoxed(Type t) {
2173 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2174 }
2175
2176 TreeTranslator removeClassParams = new TreeTranslator() {
2177 @Override
2178 public void visitTypeApply(JCTypeApply tree) {
2179 result = translate(tree.clazz);
2180 }
2181 };
2182
2183 CheckContext conditionalContext(CheckContext checkContext) {
2184 return new Check.NestedCheckContext(checkContext) {
2185 //this will use enclosing check context to check compatibility of
2186 //subexpression against target type; if we are in a method check context,
2187 //depending on whether boxing is allowed, we could have incompatibilities
2188 @Override
2189 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2190 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2191 }
2192 };
2193 }
2194
2195 /** Compute the type of a conditional expression, after
2196 * checking that it exists. See JLS 15.25. Does not take into
2197 * account the special case where condition and both arms
2198 * are constants.
2199 *
2200 * @param pos The source position to be used for error
2201 * diagnostics.
2202 * @param thentype The type of the expression's then-part.
2203 * @param elsetype The type of the expression's else-part.
2204 */
2205 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2206 if (condTypes.isEmpty()) {
2207 return syms.objectType; //TODO: how to handle?
2208 }
2209 Type first = condTypes.head;
2210 // If same type, that is the result
2211 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2212 return first.baseType();
2213
2214 List<Type> unboxedTypes = condTypes.stream()
2215 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2216 .collect(List.collector());
2217
2218 // Otherwise, if both arms can be converted to a numeric
2219 // type, return the least numeric type that fits both arms
2220 // (i.e. return larger of the two, or return int if one
2221 // arm is short, the other is char).
2222 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2223 // If one arm has an integer subrange type (i.e., byte,
2224 // short, or char), and the other is an integer constant
2225 // that fits into the subrange, return the subrange type.
2226 for (Type type : unboxedTypes) {
2227 if (!type.getTag().isStrictSubRangeOf(INT)) {
2228 continue;
2229 }
2230 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2231 return type.baseType();
2232 }
2233
2234 for (TypeTag tag : primitiveTags) {
2235 Type candidate = syms.typeOfTag[tag.ordinal()];
2236 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2237 return candidate;
2238 }
2239 }
2240 }
2241
2242 // Those were all the cases that could result in a primitive
2243 condTypes = condTypes.stream()
2244 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2245 .collect(List.collector());
2246
2247 for (Type type : condTypes) {
2248 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2249 return type.baseType();
2250 }
2251
2252 Iterator<DiagnosticPosition> posIt = positions.iterator();
2253
2254 condTypes = condTypes.stream()
2255 .map(t -> chk.checkNonVoid(posIt.next(), t))
2256 .collect(List.collector());
2257
2258 // both are known to be reference types. The result is
2259 // lub(thentype,elsetype). This cannot fail, as it will
2260 // always be possible to infer "Object" if nothing better.
2261 return types.lub(condTypes.stream()
2262 .map(t -> t.baseType())
2263 .filter(t -> !t.hasTag(BOT))
2264 .collect(List.collector()));
2265 }
2266
2267 static final TypeTag[] primitiveTags = new TypeTag[]{
2268 BYTE,
2269 CHAR,
2270 SHORT,
2271 INT,
2272 LONG,
2273 FLOAT,
2274 DOUBLE,
2275 BOOLEAN,
2276 };
2277
2278 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2279 return bindingEnv(env, env.tree, bindings);
2280 }
2281
2282 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2283 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2284 bindings.forEach(env1.info.scope::enter);
2285 return env1;
2286 }
2287
2288 public void visitIf(JCIf tree) {
2289 attribExpr(tree.cond, env, syms.booleanType);
2290
2291 // if (x) { y } [ else z ]
2292 // include x's bindings when true in y
2293 // include x's bindings when false in z
2294
2295 MatchBindings condBindings = matchBindings;
2296 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2297
2298 try {
2299 attribStat(tree.thenpart, thenEnv);
2300 } finally {
2301 thenEnv.info.scope.leave();
2302 }
2303
2304 preFlow(tree.thenpart);
2305 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2306 boolean aliveAfterElse;
2307
2308 if (tree.elsepart != null) {
2309 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2310 try {
2311 attribStat(tree.elsepart, elseEnv);
2312 } finally {
2313 elseEnv.info.scope.leave();
2314 }
2315 preFlow(tree.elsepart);
2316 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2317 } else {
2318 aliveAfterElse = true;
2319 }
2320
2321 chk.checkEmptyIf(tree);
2322
2323 List<BindingSymbol> afterIfBindings = List.nil();
2324
2325 if (aliveAfterThen && !aliveAfterElse) {
2326 afterIfBindings = condBindings.bindingsWhenTrue;
2327 } else if (aliveAfterElse && !aliveAfterThen) {
2328 afterIfBindings = condBindings.bindingsWhenFalse;
2329 }
2330
2331 addBindings2Scope(tree, afterIfBindings);
2332
2333 result = null;
2334 }
2335
2336 void preFlow(JCTree tree) {
2337 attrRecover.doRecovery();
2338 new PostAttrAnalyzer() {
2339 @Override
2340 public void scan(JCTree tree) {
2341 if (tree == null ||
2342 (tree.type != null &&
2343 tree.type == Type.stuckType)) {
2344 //don't touch stuck expressions!
2345 return;
2346 }
2347 super.scan(tree);
2348 }
2349
2350 @Override
2351 public void visitClassDef(JCClassDecl that) {
2352 if (that.sym != null) {
2353 // Method preFlow shouldn't visit class definitions
2354 // that have not been entered and attributed.
2355 // See JDK-8254557 and JDK-8203277 for more details.
2356 super.visitClassDef(that);
2357 }
2358 }
2359
2360 @Override
2361 public void visitLambda(JCLambda that) {
2362 if (that.type != null) {
2363 // Method preFlow shouldn't visit lambda expressions
2364 // that have not been entered and attributed.
2365 // See JDK-8254557 and JDK-8203277 for more details.
2366 super.visitLambda(that);
2367 }
2368 }
2369 }.scan(tree);
2370 }
2371
2372 public void visitExec(JCExpressionStatement tree) {
2373 //a fresh environment is required for 292 inference to work properly ---
2374 //see Infer.instantiatePolymorphicSignatureInstance()
2375 Env<AttrContext> localEnv = env.dup(tree);
2376 attribExpr(tree.expr, localEnv);
2377 result = null;
2378 }
2379
2380 public void visitBreak(JCBreak tree) {
2381 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2382 result = null;
2383 }
2384
2385 public void visitYield(JCYield tree) {
2386 if (env.info.yieldResult != null) {
2387 attribTree(tree.value, env, env.info.yieldResult);
2388 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2389 } else {
2390 log.error(tree.pos(), tree.value.hasTag(PARENS)
2391 ? Errors.NoSwitchExpressionQualify
2392 : Errors.NoSwitchExpression);
2393 attribTree(tree.value, env, unknownExprInfo);
2394 }
2395 result = null;
2396 }
2397
2398 public void visitContinue(JCContinue tree) {
2399 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2400 result = null;
2401 }
2402 //where
2403 /** Return the target of a break, continue or yield statement,
2404 * if it exists, report an error if not.
2405 * Note: The target of a labelled break or continue is the
2406 * (non-labelled) statement tree referred to by the label,
2407 * not the tree representing the labelled statement itself.
2408 *
2409 * @param pos The position to be used for error diagnostics
2410 * @param tag The tag of the jump statement. This is either
2411 * Tree.BREAK or Tree.CONTINUE.
2412 * @param label The label of the jump statement, or null if no
2413 * label is given.
2414 * @param env The environment current at the jump statement.
2415 */
2416 private JCTree findJumpTarget(DiagnosticPosition pos,
2417 JCTree.Tag tag,
2418 Name label,
2419 Env<AttrContext> env) {
2420 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2421
2422 if (jumpTarget.snd != null) {
2423 log.error(pos, jumpTarget.snd);
2424 }
2425
2426 return jumpTarget.fst;
2427 }
2428 /** Return the target of a break or continue statement, if it exists,
2429 * report an error if not.
2430 * Note: The target of a labelled break or continue is the
2431 * (non-labelled) statement tree referred to by the label,
2432 * not the tree representing the labelled statement itself.
2433 *
2434 * @param tag The tag of the jump statement. This is either
2435 * Tree.BREAK or Tree.CONTINUE.
2436 * @param label The label of the jump statement, or null if no
2437 * label is given.
2438 * @param env The environment current at the jump statement.
2439 */
2440 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2441 Name label,
2442 Env<AttrContext> env) {
2443 // Search environments outwards from the point of jump.
2444 Env<AttrContext> env1 = env;
2445 JCDiagnostic.Error pendingError = null;
2446 LOOP:
2447 while (env1 != null) {
2448 switch (env1.tree.getTag()) {
2449 case LABELLED:
2450 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2451 if (label == labelled.label) {
2452 // If jump is a continue, check that target is a loop.
2453 if (tag == CONTINUE) {
2454 if (!labelled.body.hasTag(DOLOOP) &&
2455 !labelled.body.hasTag(WHILELOOP) &&
2456 !labelled.body.hasTag(FORLOOP) &&
2457 !labelled.body.hasTag(FOREACHLOOP)) {
2458 pendingError = Errors.NotLoopLabel(label);
2459 }
2460 // Found labelled statement target, now go inwards
2461 // to next non-labelled tree.
2462 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2463 } else {
2464 return Pair.of(labelled, pendingError);
2465 }
2466 }
2467 break;
2468 case DOLOOP:
2469 case WHILELOOP:
2470 case FORLOOP:
2471 case FOREACHLOOP:
2472 if (label == null) return Pair.of(env1.tree, pendingError);
2473 break;
2474 case SWITCH:
2475 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2476 break;
2477 case SWITCH_EXPRESSION:
2478 if (tag == YIELD) {
2479 return Pair.of(env1.tree, null);
2480 } else if (tag == BREAK) {
2481 pendingError = Errors.BreakOutsideSwitchExpression;
2482 } else {
2483 pendingError = Errors.ContinueOutsideSwitchExpression;
2484 }
2485 break;
2486 case LAMBDA:
2487 case METHODDEF:
2488 case CLASSDEF:
2489 break LOOP;
2490 default:
2491 }
2492 env1 = env1.next;
2493 }
2494 if (label != null)
2495 return Pair.of(null, Errors.UndefLabel(label));
2496 else if (pendingError != null)
2497 return Pair.of(null, pendingError);
2498 else if (tag == CONTINUE)
2499 return Pair.of(null, Errors.ContOutsideLoop);
2500 else
2501 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2502 }
2503
2504 public void visitReturn(JCReturn tree) {
2505 // Check that there is an enclosing method which is
2506 // nested within than the enclosing class.
2507 if (env.info.returnResult == null) {
2508 log.error(tree.pos(), Errors.RetOutsideMeth);
2509 } else if (env.info.yieldResult != null) {
2510 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2511 if (tree.expr != null) {
2512 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2513 }
2514 } else if (!env.info.isLambda &&
2515 !env.info.isNewClass &&
2516 env.enclMethod != null &&
2517 TreeInfo.isCompactConstructor(env.enclMethod)) {
2518 log.error(env.enclMethod,
2519 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2520 } else {
2521 // Attribute return expression, if it exists, and check that
2522 // it conforms to result type of enclosing method.
2523 if (tree.expr != null) {
2524 if (env.info.returnResult.pt.hasTag(VOID)) {
2525 env.info.returnResult.checkContext.report(tree.expr.pos(),
2526 diags.fragment(Fragments.UnexpectedRetVal));
2527 }
2528 attribTree(tree.expr, env, env.info.returnResult);
2529 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2530 !env.info.returnResult.pt.hasTag(NONE)) {
2531 env.info.returnResult.checkContext.report(tree.pos(),
2532 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2533 }
2534 }
2535 result = null;
2536 }
2537
2538 public void visitThrow(JCThrow tree) {
2539 Type owntype = attribExpr(tree.expr, env, Type.noType);
2540 chk.checkType(tree, owntype, syms.throwableType);
2541 result = null;
2542 }
2543
2544 public void visitAssert(JCAssert tree) {
2545 attribExpr(tree.cond, env, syms.booleanType);
2546 if (tree.detail != null) {
2547 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2548 }
2549 result = null;
2550 }
2551
2552 /** Visitor method for method invocations.
2553 * NOTE: The method part of an application will have in its type field
2554 * the return type of the method, not the method's type itself!
2555 */
2556 public void visitApply(JCMethodInvocation tree) {
2557 // The local environment of a method application is
2558 // a new environment nested in the current one.
2559 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2560
2561 // The types of the actual method arguments.
2562 List<Type> argtypes;
2563
2564 // The types of the actual method type arguments.
2565 List<Type> typeargtypes = null;
2566
2567 Name methName = TreeInfo.name(tree.meth);
2568
2569 boolean isConstructorCall =
2570 methName == names._this || methName == names._super;
2571
2572 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2573 if (isConstructorCall) {
2574
2575 // Attribute arguments, yielding list of argument types.
2576 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2577 argtypes = argtypesBuf.toList();
2578 typeargtypes = attribTypes(tree.typeargs, localEnv);
2579
2580 // Done with this()/super() parameters. End of constructor prologue.
2581 env.info.ctorPrologue = false;
2582
2583 // Variable `site' points to the class in which the called
2584 // constructor is defined.
2585 Type site = env.enclClass.sym.type;
2586 if (methName == names._super) {
2587 if (site == syms.objectType) {
2588 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2589 site = types.createErrorType(syms.objectType);
2590 } else {
2591 site = types.supertype(site);
2592 }
2593 }
2594
2595 if (site.hasTag(CLASS)) {
2596 Type encl = site.getEnclosingType();
2597 while (encl != null && encl.hasTag(TYPEVAR))
2598 encl = encl.getUpperBound();
2599 if (encl.hasTag(CLASS)) {
2600 // we are calling a nested class
2601
2602 if (tree.meth.hasTag(SELECT)) {
2603 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2604
2605 // We are seeing a prefixed call, of the form
2606 // <expr>.super(...).
2607 // Check that the prefix expression conforms
2608 // to the outer instance type of the class.
2609 chk.checkRefType(qualifier.pos(),
2610 attribExpr(qualifier, localEnv,
2611 encl));
2612 }
2613 } else if (tree.meth.hasTag(SELECT)) {
2614 log.error(tree.meth.pos(),
2615 Errors.IllegalQualNotIcls(site.tsym));
2616 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2617 }
2618
2619 if (tree.meth.hasTag(IDENT)) {
2620 // non-qualified super(...) call; check whether explicit constructor
2621 // invocation is well-formed. If the super class is an inner class,
2622 // make sure that an appropriate implicit qualifier exists. If the super
2623 // class is a local class, make sure that the current class is defined
2624 // in the same context as the local class.
2625 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2626 }
2627
2628 // if we're calling a java.lang.Enum constructor,
2629 // prefix the implicit String and int parameters
2630 if (site.tsym == syms.enumSym)
2631 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2632
2633 // Resolve the called constructor under the assumption
2634 // that we are referring to a superclass instance of the
2635 // current instance (JLS ???).
2636 boolean selectSuperPrev = localEnv.info.selectSuper;
2637 localEnv.info.selectSuper = true;
2638 localEnv.info.pendingResolutionPhase = null;
2639 Symbol sym = rs.resolveConstructor(
2640 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2641 localEnv.info.selectSuper = selectSuperPrev;
2642
2643 // Set method symbol to resolved constructor...
2644 TreeInfo.setSymbol(tree.meth, sym);
2645
2646 // ...and check that it is legal in the current context.
2647 // (this will also set the tree's type)
2648 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2649 checkId(tree.meth, site, sym, localEnv,
2650 new ResultInfo(kind, mpt));
2651 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2652 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2653 }
2654 // Otherwise, `site' is an error type and we do nothing
2655 result = tree.type = syms.voidType;
2656 } else {
2657 // Otherwise, we are seeing a regular method call.
2658 // Attribute the arguments, yielding list of argument types, ...
2659 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2660 argtypes = argtypesBuf.toList();
2661 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2662
2663 // ... and attribute the method using as a prototype a methodtype
2664 // whose formal argument types is exactly the list of actual
2665 // arguments (this will also set the method symbol).
2666 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2667 localEnv.info.pendingResolutionPhase = null;
2668 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2669
2670 // Compute the result type.
2671 Type restype = mtype.getReturnType();
2672 if (restype.hasTag(WILDCARD))
2673 throw new AssertionError(mtype);
2674
2675 Type qualifier = (tree.meth.hasTag(SELECT))
2676 ? ((JCFieldAccess) tree.meth).selected.type
2677 : env.enclClass.sym.type;
2678 Symbol msym = TreeInfo.symbol(tree.meth);
2679 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2680
2681 chk.checkRefTypes(tree.typeargs, typeargtypes);
2682
2683 // Check that value of resulting type is admissible in the
2684 // current context. Also, capture the return type
2685 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2686 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2687 }
2688 chk.validate(tree.typeargs, localEnv);
2689 }
2690 //where
2691 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2692 if (msym != null &&
2693 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2694 methodName == names.getClass &&
2695 argtypes.isEmpty()) {
2696 // as a special case, x.getClass() has type Class<? extends |X|>
2697 return new ClassType(restype.getEnclosingType(),
2698 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2699 BoundKind.EXTENDS,
2700 syms.boundClass)),
2701 restype.tsym,
2702 restype.getMetadata());
2703 } else if (msym != null &&
2704 msym.owner == syms.arrayClass &&
2705 methodName == names.clone &&
2706 types.isArray(qualifierType)) {
2707 // as a special case, array.clone() has a result that is
2708 // the same as static type of the array being cloned
2709 return qualifierType;
2710 } else {
2711 return restype;
2712 }
2713 }
2714
2715 /** Obtain a method type with given argument types.
2716 */
2717 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2718 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2719 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2720 }
2721
2722 public void visitNewClass(final JCNewClass tree) {
2723 Type owntype = types.createErrorType(tree.type);
2724
2725 // The local environment of a class creation is
2726 // a new environment nested in the current one.
2727 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2728
2729 // The anonymous inner class definition of the new expression,
2730 // if one is defined by it.
2731 JCClassDecl cdef = tree.def;
2732
2733 // If enclosing class is given, attribute it, and
2734 // complete class name to be fully qualified
2735 JCExpression clazz = tree.clazz; // Class field following new
2736 JCExpression clazzid; // Identifier in class field
2737 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2738 annoclazzid = null;
2739
2740 if (clazz.hasTag(TYPEAPPLY)) {
2741 clazzid = ((JCTypeApply) clazz).clazz;
2742 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2743 annoclazzid = (JCAnnotatedType) clazzid;
2744 clazzid = annoclazzid.underlyingType;
2745 }
2746 } else {
2747 if (clazz.hasTag(ANNOTATED_TYPE)) {
2748 annoclazzid = (JCAnnotatedType) clazz;
2749 clazzid = annoclazzid.underlyingType;
2750 } else {
2751 clazzid = clazz;
2752 }
2753 }
2754
2755 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2756
2757 if (tree.encl != null) {
2758 // We are seeing a qualified new, of the form
2759 // <expr>.new C <...> (...) ...
2760 // In this case, we let clazz stand for the name of the
2761 // allocated class C prefixed with the type of the qualifier
2762 // expression, so that we can
2763 // resolve it with standard techniques later. I.e., if
2764 // <expr> has type T, then <expr>.new C <...> (...)
2765 // yields a clazz T.C.
2766 Type encltype = chk.checkRefType(tree.encl.pos(),
2767 attribExpr(tree.encl, env));
2768 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2769 // from expr to the combined type, or not? Yes, do this.
2770 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2771 ((JCIdent) clazzid).name);
2772
2773 EndPosTable endPosTable = this.env.toplevel.endPositions;
2774 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2775 if (clazz.hasTag(ANNOTATED_TYPE)) {
2776 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2777 List<JCAnnotation> annos = annoType.annotations;
2778
2779 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2780 clazzid1 = make.at(tree.pos).
2781 TypeApply(clazzid1,
2782 ((JCTypeApply) clazz).arguments);
2783 }
2784
2785 clazzid1 = make.at(tree.pos).
2786 AnnotatedType(annos, clazzid1);
2787 } else if (clazz.hasTag(TYPEAPPLY)) {
2788 clazzid1 = make.at(tree.pos).
2789 TypeApply(clazzid1,
2790 ((JCTypeApply) clazz).arguments);
2791 }
2792
2793 clazz = clazzid1;
2794 }
2795
2796 // Attribute clazz expression and store
2797 // symbol + type back into the attributed tree.
2798 Type clazztype;
2799
2800 try {
2801 env.info.isNewClass = true;
2802 clazztype = TreeInfo.isEnumInit(env.tree) ?
2803 attribIdentAsEnumType(env, (JCIdent)clazz) :
2804 attribType(clazz, env);
2805 } finally {
2806 env.info.isNewClass = false;
2807 }
2808
2809 clazztype = chk.checkDiamond(tree, clazztype);
2810 chk.validate(clazz, localEnv);
2811 if (tree.encl != null) {
2812 // We have to work in this case to store
2813 // symbol + type back into the attributed tree.
2814 tree.clazz.type = clazztype;
2815 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2816 clazzid.type = ((JCIdent) clazzid).sym.type;
2817 if (annoclazzid != null) {
2818 annoclazzid.type = clazzid.type;
2819 }
2820 if (!clazztype.isErroneous()) {
2821 if (cdef != null && clazztype.tsym.isInterface()) {
2822 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2823 } else if (clazztype.tsym.isStatic()) {
2824 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2825 }
2826 }
2827 } else {
2828 // Check for the existence of an apropos outer instance
2829 checkNewInnerClass(tree.pos(), env, clazztype, false);
2830 }
2831
2832 // Attribute constructor arguments.
2833 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2834 final KindSelector pkind =
2835 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2836 List<Type> argtypes = argtypesBuf.toList();
2837 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2838
2839 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2840 // Enums may not be instantiated except implicitly
2841 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2842 (!env.tree.hasTag(VARDEF) ||
2843 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2844 ((JCVariableDecl) env.tree).init != tree))
2845 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2846
2847 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2848 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2849 boolean skipNonDiamondPath = false;
2850 // Check that class is not abstract
2851 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2852 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2853 log.error(tree.pos(),
2854 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2855 skipNonDiamondPath = true;
2856 } else if (cdef != null && clazztype.tsym.isInterface()) {
2857 // Check that no constructor arguments are given to
2858 // anonymous classes implementing an interface
2859 if (!argtypes.isEmpty())
2860 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2861
2862 if (!typeargtypes.isEmpty())
2863 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2864
2865 // Error recovery: pretend no arguments were supplied.
2866 argtypes = List.nil();
2867 typeargtypes = List.nil();
2868 skipNonDiamondPath = true;
2869 }
2870 if (TreeInfo.isDiamond(tree)) {
2871 ClassType site = new ClassType(clazztype.getEnclosingType(),
2872 clazztype.tsym.type.getTypeArguments(),
2873 clazztype.tsym,
2874 clazztype.getMetadata());
2875
2876 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2877 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2878 diamondEnv.info.pendingResolutionPhase = null;
2879
2880 //if the type of the instance creation expression is a class type
2881 //apply method resolution inference (JLS 15.12.2.7). The return type
2882 //of the resolved constructor will be a partially instantiated type
2883 Symbol constructor = rs.resolveDiamond(tree.pos(),
2884 diamondEnv,
2885 site,
2886 argtypes,
2887 typeargtypes);
2888 tree.constructor = constructor.baseSymbol();
2889
2890 final TypeSymbol csym = clazztype.tsym;
2891 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2892 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2893 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2894 constructorType = checkId(tree, site,
2895 constructor,
2896 diamondEnv,
2897 diamondResult);
2898
2899 tree.clazz.type = types.createErrorType(clazztype);
2900 if (!constructorType.isErroneous()) {
2901 tree.clazz.type = clazz.type = constructorType.getReturnType();
2902 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2903 }
2904 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2905 }
2906
2907 // Resolve the called constructor under the assumption
2908 // that we are referring to a superclass instance of the
2909 // current instance (JLS ???).
2910 else if (!skipNonDiamondPath) {
2911 //the following code alters some of the fields in the current
2912 //AttrContext - hence, the current context must be dup'ed in
2913 //order to avoid downstream failures
2914 Env<AttrContext> rsEnv = localEnv.dup(tree);
2915 rsEnv.info.selectSuper = cdef != null;
2916 rsEnv.info.pendingResolutionPhase = null;
2917 tree.constructor = rs.resolveConstructor(
2918 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2919 if (cdef == null) { //do not check twice!
2920 tree.constructorType = checkId(tree,
2921 clazztype,
2922 tree.constructor,
2923 rsEnv,
2924 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2925 if (rsEnv.info.lastResolveVarargs())
2926 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2927 }
2928 }
2929
2930 if (cdef != null) {
2931 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2932 return;
2933 }
2934
2935 if (tree.constructor != null && tree.constructor.kind == MTH)
2936 owntype = clazztype;
2937 }
2938 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2939 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2940 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2941 //we need to wait for inference to finish and then replace inference vars in the constructor type
2942 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2943 instantiatedContext -> {
2944 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2945 });
2946 }
2947 chk.validate(tree.typeargs, localEnv);
2948 }
2949
2950 // where
2951 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2952 JCClassDecl cdef, Env<AttrContext> localEnv,
2953 List<Type> argtypes, List<Type> typeargtypes,
2954 KindSelector pkind) {
2955 // We are seeing an anonymous class instance creation.
2956 // In this case, the class instance creation
2957 // expression
2958 //
2959 // E.new <typeargs1>C<typargs2>(args) { ... }
2960 //
2961 // is represented internally as
2962 //
2963 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2964 //
2965 // This expression is then *transformed* as follows:
2966 //
2967 // (1) add an extends or implements clause
2968 // (2) add a constructor.
2969 //
2970 // For instance, if C is a class, and ET is the type of E,
2971 // the expression
2972 //
2973 // E.new <typeargs1>C<typargs2>(args) { ... }
2974 //
2975 // is translated to (where X is a fresh name and typarams is the
2976 // parameter list of the super constructor):
2977 //
2978 // new <typeargs1>X(<*nullchk*>E, args) where
2979 // X extends C<typargs2> {
2980 // <typarams> X(ET e, args) {
2981 // e.<typeargs1>super(args)
2982 // }
2983 // ...
2984 // }
2985 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2986 Type enclType = clazztype.getEnclosingType();
2987 if (enclType != null &&
2988 enclType.hasTag(CLASS) &&
2989 !chk.checkDenotable((ClassType)enclType)) {
2990 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2991 }
2992 final boolean isDiamond = TreeInfo.isDiamond(tree);
2993 if (isDiamond
2994 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2995 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2996 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2997 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2998 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2999 instantiatedContext -> {
3000 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3001 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3002 ResultInfo prevResult = this.resultInfo;
3003 try {
3004 this.resultInfo = resultInfoForClassDefinition;
3005 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3006 dupLocalEnv, argtypes, typeargtypes, pkind);
3007 } finally {
3008 this.resultInfo = prevResult;
3009 }
3010 });
3011 } else {
3012 if (isDiamond && clazztype.hasTag(CLASS)) {
3013 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3014 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3015 // One or more types inferred in the previous steps is non-denotable.
3016 Fragment fragment = Diamond(clazztype.tsym);
3017 log.error(tree.clazz.pos(),
3018 Errors.CantApplyDiamond1(
3019 fragment,
3020 invalidDiamondArgs.size() > 1 ?
3021 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3022 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3023 }
3024 // For <>(){}, inferred types must also be accessible.
3025 for (Type t : clazztype.getTypeArguments()) {
3026 rs.checkAccessibleType(env, t);
3027 }
3028 }
3029
3030 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3031 // false for isInterface call even when the original type is an interface.
3032 boolean implementing = clazztype.tsym.isInterface() ||
3033 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3034 clazztype.getOriginalType().tsym.isInterface();
3035
3036 if (implementing) {
3037 cdef.implementing = List.of(clazz);
3038 } else {
3039 cdef.extending = clazz;
3040 }
3041
3042 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3043 rs.isSerializable(clazztype)) {
3044 localEnv.info.isSerializable = true;
3045 }
3046
3047 attribStat(cdef, localEnv);
3048
3049 List<Type> finalargtypes;
3050 // If an outer instance is given,
3051 // prefix it to the constructor arguments
3052 // and delete it from the new expression
3053 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3054 finalargtypes = argtypes.prepend(tree.encl.type);
3055 } else {
3056 finalargtypes = argtypes;
3057 }
3058
3059 // Reassign clazztype and recompute constructor. As this necessarily involves
3060 // another attribution pass for deferred types in the case of <>, replicate
3061 // them. Original arguments have right decorations already.
3062 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3063 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3064 }
3065
3066 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3067 : cdef.sym.type;
3068 Symbol sym = tree.constructor = rs.resolveConstructor(
3069 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3070 Assert.check(!sym.kind.isResolutionError());
3071 tree.constructor = sym;
3072 tree.constructorType = checkId(tree,
3073 clazztype,
3074 tree.constructor,
3075 localEnv,
3076 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3077 }
3078 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3079 clazztype : types.createErrorType(tree.type);
3080 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3081 chk.validate(tree.typeargs, localEnv);
3082 }
3083
3084 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3085 return new Check.NestedCheckContext(checkContext) {
3086 @Override
3087 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3088 enclosingContext.report(clazz.clazz,
3089 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3090 }
3091 };
3092 }
3093
3094 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3095 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3096 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3097 (!isLocal && !type.tsym.isInner()) ||
3098 (isSuper && env.enclClass.sym.isAnonymous())) {
3099 // nothing to check
3100 return;
3101 }
3102 Symbol res = isLocal ?
3103 rs.findLocalClassOwner(env, type.tsym) :
3104 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3105 if (res.exists()) {
3106 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3107 } else {
3108 log.error(pos, Errors.EnclClassRequired(type.tsym));
3109 }
3110 }
3111
3112 /** Make an attributed null check tree.
3113 */
3114 public JCExpression makeNullCheck(JCExpression arg) {
3115 // optimization: new Outer() can never be null; skip null check
3116 if (arg.getTag() == NEWCLASS)
3117 return arg;
3118 // optimization: X.this is never null; skip null check
3119 Name name = TreeInfo.name(arg);
3120 if (name == names._this || name == names._super) return arg;
3121
3122 JCTree.Tag optag = NULLCHK;
3123 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3124 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3125 tree.type = arg.type;
3126 return tree;
3127 }
3128
3129 public void visitNewArray(JCNewArray tree) {
3130 Type owntype = types.createErrorType(tree.type);
3131 Env<AttrContext> localEnv = env.dup(tree);
3132 Type elemtype;
3133 if (tree.elemtype != null) {
3134 elemtype = attribType(tree.elemtype, localEnv);
3135 chk.validate(tree.elemtype, localEnv);
3136 owntype = elemtype;
3137 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3138 attribExpr(l.head, localEnv, syms.intType);
3139 owntype = new ArrayType(owntype, syms.arrayClass);
3140 }
3141 } else {
3142 // we are seeing an untyped aggregate { ... }
3143 // this is allowed only if the prototype is an array
3144 if (pt().hasTag(ARRAY)) {
3145 elemtype = types.elemtype(pt());
3146 } else {
3147 if (!pt().hasTag(ERROR) &&
3148 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3149 log.error(tree.pos(),
3150 Errors.IllegalInitializerForType(pt()));
3151 }
3152 elemtype = types.createErrorType(pt());
3153 }
3154 }
3155 if (tree.elems != null) {
3156 attribExprs(tree.elems, localEnv, elemtype);
3157 owntype = new ArrayType(elemtype, syms.arrayClass);
3158 }
3159 if (!types.isReifiable(elemtype))
3160 log.error(tree.pos(), Errors.GenericArrayCreation);
3161 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3162 }
3163
3164 /*
3165 * A lambda expression can only be attributed when a target-type is available.
3166 * In addition, if the target-type is that of a functional interface whose
3167 * descriptor contains inference variables in argument position the lambda expression
3168 * is 'stuck' (see DeferredAttr).
3169 */
3170 @Override
3171 public void visitLambda(final JCLambda that) {
3172 boolean wrongContext = false;
3173 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3174 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3175 //lambda only allowed in assignment or method invocation/cast context
3176 log.error(that.pos(), Errors.UnexpectedLambda);
3177 }
3178 resultInfo = recoveryInfo;
3179 wrongContext = true;
3180 }
3181 //create an environment for attribution of the lambda expression
3182 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3183 boolean needsRecovery =
3184 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3185 try {
3186 if (needsRecovery && rs.isSerializable(pt())) {
3187 localEnv.info.isSerializable = true;
3188 localEnv.info.isSerializableLambda = true;
3189 }
3190 List<Type> explicitParamTypes = null;
3191 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3192 //attribute lambda parameters
3193 attribStats(that.params, localEnv);
3194 explicitParamTypes = TreeInfo.types(that.params);
3195 }
3196
3197 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3198 Type currentTarget = targetInfo.target;
3199 Type lambdaType = targetInfo.descriptor;
3200
3201 if (currentTarget.isErroneous()) {
3202 result = that.type = currentTarget;
3203 return;
3204 }
3205
3206 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3207
3208 if (lambdaType.hasTag(FORALL)) {
3209 //lambda expression target desc cannot be a generic method
3210 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3211 kindName(currentTarget.tsym),
3212 currentTarget.tsym);
3213 resultInfo.checkContext.report(that, diags.fragment(msg));
3214 result = that.type = types.createErrorType(pt());
3215 return;
3216 }
3217
3218 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3219 //add param type info in the AST
3220 List<Type> actuals = lambdaType.getParameterTypes();
3221 List<JCVariableDecl> params = that.params;
3222
3223 boolean arityMismatch = false;
3224
3225 while (params.nonEmpty()) {
3226 if (actuals.isEmpty()) {
3227 //not enough actuals to perform lambda parameter inference
3228 arityMismatch = true;
3229 }
3230 //reset previously set info
3231 Type argType = arityMismatch ?
3232 syms.errType :
3233 actuals.head;
3234 if (params.head.isImplicitlyTyped()) {
3235 setSyntheticVariableType(params.head, argType);
3236 }
3237 params.head.sym = null;
3238 actuals = actuals.isEmpty() ?
3239 actuals :
3240 actuals.tail;
3241 params = params.tail;
3242 }
3243
3244 //attribute lambda parameters
3245 attribStats(that.params, localEnv);
3246
3247 if (arityMismatch) {
3248 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3249 result = that.type = types.createErrorType(currentTarget);
3250 return;
3251 }
3252 }
3253
3254 //from this point on, no recovery is needed; if we are in assignment context
3255 //we will be able to attribute the whole lambda body, regardless of errors;
3256 //if we are in a 'check' method context, and the lambda is not compatible
3257 //with the target-type, it will be recovered anyway in Attr.checkId
3258 needsRecovery = false;
3259
3260 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3261 lambdaBodyResult(that, lambdaType, resultInfo);
3262
3263 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3264 attribTree(that.getBody(), localEnv, bodyResultInfo);
3265 } else {
3266 JCBlock body = (JCBlock)that.body;
3267 if (body == breakTree &&
3268 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3269 breakTreeFound(copyEnv(localEnv));
3270 }
3271 attribStats(body.stats, localEnv);
3272 }
3273
3274 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3275
3276 boolean isSpeculativeRound =
3277 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3278
3279 preFlow(that);
3280 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3281
3282 that.type = currentTarget; //avoids recovery at this stage
3283 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3284
3285 if (!isSpeculativeRound) {
3286 //add thrown types as bounds to the thrown types free variables if needed:
3287 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3288 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3289 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3290 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3291 }
3292 }
3293
3294 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3295 }
3296 result = wrongContext ? that.type = types.createErrorType(pt())
3297 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3298 } catch (Types.FunctionDescriptorLookupError ex) {
3299 JCDiagnostic cause = ex.getDiagnostic();
3300 resultInfo.checkContext.report(that, cause);
3301 result = that.type = types.createErrorType(pt());
3302 return;
3303 } catch (CompletionFailure cf) {
3304 chk.completionError(that.pos(), cf);
3305 } catch (Throwable t) {
3306 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3307 //as that would likely cause the same exception again.
3308 needsRecovery = false;
3309 throw t;
3310 } finally {
3311 localEnv.info.scope.leave();
3312 if (needsRecovery) {
3313 Type prevResult = result;
3314 try {
3315 attribTree(that, env, recoveryInfo);
3316 } finally {
3317 if (result == Type.recoveryType) {
3318 result = prevResult;
3319 }
3320 }
3321 }
3322 }
3323 }
3324 //where
3325 class TargetInfo {
3326 Type target;
3327 Type descriptor;
3328
3329 public TargetInfo(Type target, Type descriptor) {
3330 this.target = target;
3331 this.descriptor = descriptor;
3332 }
3333 }
3334
3335 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3336 Type lambdaType;
3337 Type currentTarget = resultInfo.pt;
3338 if (resultInfo.pt != Type.recoveryType) {
3339 /* We need to adjust the target. If the target is an
3340 * intersection type, for example: SAM & I1 & I2 ...
3341 * the target will be updated to SAM
3342 */
3343 currentTarget = targetChecker.visit(currentTarget, that);
3344 if (!currentTarget.isIntersection()) {
3345 if (explicitParamTypes != null) {
3346 currentTarget = infer.instantiateFunctionalInterface(that,
3347 currentTarget, explicitParamTypes, resultInfo.checkContext);
3348 }
3349 currentTarget = types.removeWildcards(currentTarget);
3350 lambdaType = types.findDescriptorType(currentTarget);
3351 } else {
3352 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3353 ListBuffer<Type> components = new ListBuffer<>();
3354 for (Type bound : ict.getExplicitComponents()) {
3355 if (explicitParamTypes != null) {
3356 try {
3357 bound = infer.instantiateFunctionalInterface(that,
3358 bound, explicitParamTypes, resultInfo.checkContext);
3359 } catch (FunctionDescriptorLookupError t) {
3360 // do nothing
3361 }
3362 }
3363 bound = types.removeWildcards(bound);
3364 components.add(bound);
3365 }
3366 currentTarget = types.makeIntersectionType(components.toList());
3367 currentTarget.tsym.flags_field |= INTERFACE;
3368 lambdaType = types.findDescriptorType(currentTarget);
3369 }
3370
3371 } else {
3372 currentTarget = Type.recoveryType;
3373 lambdaType = fallbackDescriptorType(that);
3374 }
3375 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3376 //lambda expression target desc cannot be a generic method
3377 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3378 kindName(currentTarget.tsym),
3379 currentTarget.tsym);
3380 resultInfo.checkContext.report(that, diags.fragment(msg));
3381 currentTarget = types.createErrorType(pt());
3382 }
3383 return new TargetInfo(currentTarget, lambdaType);
3384 }
3385
3386 void preFlow(JCLambda tree) {
3387 attrRecover.doRecovery();
3388 new PostAttrAnalyzer() {
3389 @Override
3390 public void scan(JCTree tree) {
3391 if (tree == null ||
3392 (tree.type != null &&
3393 tree.type == Type.stuckType)) {
3394 //don't touch stuck expressions!
3395 return;
3396 }
3397 super.scan(tree);
3398 }
3399
3400 @Override
3401 public void visitClassDef(JCClassDecl that) {
3402 // or class declaration trees!
3403 }
3404
3405 public void visitLambda(JCLambda that) {
3406 // or lambda expressions!
3407 }
3408 }.scan(tree.body);
3409 }
3410
3411 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3412
3413 @Override
3414 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3415 return t.isIntersection() ?
3416 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3417 }
3418
3419 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3420 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3421 return ict;
3422 }
3423
3424 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3425 ListBuffer<Type> targs = new ListBuffer<>();
3426 ListBuffer<Type> supertypes = new ListBuffer<>();
3427 for (Type i : ict.interfaces_field) {
3428 if (i.isParameterized()) {
3429 targs.appendList(i.tsym.type.allparams());
3430 }
3431 supertypes.append(i.tsym.type);
3432 }
3433 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3434 notionalIntf.allparams_field = targs.toList();
3435 notionalIntf.tsym.flags_field |= INTERFACE;
3436 return notionalIntf.tsym;
3437 }
3438 };
3439
3440 private Type fallbackDescriptorType(JCExpression tree) {
3441 switch (tree.getTag()) {
3442 case LAMBDA:
3443 JCLambda lambda = (JCLambda)tree;
3444 List<Type> argtypes = List.nil();
3445 for (JCVariableDecl param : lambda.params) {
3446 argtypes = param.vartype != null && param.vartype.type != null ?
3447 argtypes.append(param.vartype.type) :
3448 argtypes.append(syms.errType);
3449 }
3450 return new MethodType(argtypes, Type.recoveryType,
3451 List.of(syms.throwableType), syms.methodClass);
3452 case REFERENCE:
3453 return new MethodType(List.nil(), Type.recoveryType,
3454 List.of(syms.throwableType), syms.methodClass);
3455 default:
3456 Assert.error("Cannot get here!");
3457 }
3458 return null;
3459 }
3460
3461 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3462 final InferenceContext inferenceContext, final Type... ts) {
3463 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3464 }
3465
3466 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3467 final InferenceContext inferenceContext, final List<Type> ts) {
3468 if (inferenceContext.free(ts)) {
3469 inferenceContext.addFreeTypeListener(ts,
3470 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3471 } else {
3472 for (Type t : ts) {
3473 rs.checkAccessibleType(env, t);
3474 }
3475 }
3476 }
3477
3478 /**
3479 * Lambda/method reference have a special check context that ensures
3480 * that i.e. a lambda return type is compatible with the expected
3481 * type according to both the inherited context and the assignment
3482 * context.
3483 */
3484 class FunctionalReturnContext extends Check.NestedCheckContext {
3485
3486 FunctionalReturnContext(CheckContext enclosingContext) {
3487 super(enclosingContext);
3488 }
3489
3490 @Override
3491 public boolean compatible(Type found, Type req, Warner warn) {
3492 //return type must be compatible in both current context and assignment context
3493 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3494 }
3495
3496 @Override
3497 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3498 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3499 }
3500 }
3501
3502 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3503
3504 JCExpression expr;
3505 boolean expStmtExpected;
3506
3507 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3508 super(enclosingContext);
3509 this.expr = expr;
3510 }
3511
3512 @Override
3513 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3514 if (expStmtExpected) {
3515 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3516 } else {
3517 super.report(pos, details);
3518 }
3519 }
3520
3521 @Override
3522 public boolean compatible(Type found, Type req, Warner warn) {
3523 //a void return is compatible with an expression statement lambda
3524 if (req.hasTag(VOID)) {
3525 expStmtExpected = true;
3526 return TreeInfo.isExpressionStatement(expr);
3527 } else {
3528 return super.compatible(found, req, warn);
3529 }
3530 }
3531 }
3532
3533 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3534 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3535 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3536 new FunctionalReturnContext(resultInfo.checkContext);
3537
3538 return descriptor.getReturnType() == Type.recoveryType ?
3539 recoveryInfo :
3540 new ResultInfo(KindSelector.VAL,
3541 descriptor.getReturnType(), funcContext);
3542 }
3543
3544 /**
3545 * Lambda compatibility. Check that given return types, thrown types, parameter types
3546 * are compatible with the expected functional interface descriptor. This means that:
3547 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3548 * types must be compatible with the return type of the expected descriptor.
3549 */
3550 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3551 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3552
3553 //return values have already been checked - but if lambda has no return
3554 //values, we must ensure that void/value compatibility is correct;
3555 //this amounts at checking that, if a lambda body can complete normally,
3556 //the descriptor's return type must be void
3557 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3558 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3559 Fragment msg =
3560 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3561 checkContext.report(tree,
3562 diags.fragment(msg));
3563 }
3564
3565 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3566 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3567 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3568 }
3569 }
3570
3571 /* This method returns an environment to be used to attribute a lambda
3572 * expression.
3573 *
3574 * The owner of this environment is a method symbol. If the current owner
3575 * is not a method (e.g. if the lambda occurs in a field initializer), then
3576 * a synthetic method symbol owner is created.
3577 */
3578 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3579 Env<AttrContext> lambdaEnv;
3580 Symbol owner = env.info.scope.owner;
3581 if (owner.kind == VAR && owner.owner.kind == TYP) {
3582 // If the lambda is nested in a field initializer, we need to create a fake init method.
3583 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3584 // init symbol's owner).
3585 ClassSymbol enclClass = owner.enclClass();
3586 Name initName = owner.isStatic() ? names.clinit : names.init;
3587 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3588 initName, initBlockType, enclClass);
3589 initSym.params = List.nil();
3590 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3591 } else {
3592 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3593 }
3594 lambdaEnv.info.yieldResult = null;
3595 lambdaEnv.info.isLambda = true;
3596 return lambdaEnv;
3597 }
3598
3599 @Override
3600 public void visitReference(final JCMemberReference that) {
3601 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3602 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3603 //method reference only allowed in assignment or method invocation/cast context
3604 log.error(that.pos(), Errors.UnexpectedMref);
3605 }
3606 result = that.type = types.createErrorType(pt());
3607 return;
3608 }
3609 final Env<AttrContext> localEnv = env.dup(that);
3610 try {
3611 //attribute member reference qualifier - if this is a constructor
3612 //reference, the expected kind must be a type
3613 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3614
3615 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3616 exprType = chk.checkConstructorRefType(that.expr, exprType);
3617 if (!exprType.isErroneous() &&
3618 exprType.isRaw() &&
3619 that.typeargs != null) {
3620 log.error(that.expr.pos(),
3621 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3622 Fragments.MrefInferAndExplicitParams));
3623 exprType = types.createErrorType(exprType);
3624 }
3625 }
3626
3627 if (exprType.isErroneous()) {
3628 //if the qualifier expression contains problems,
3629 //give up attribution of method reference
3630 result = that.type = exprType;
3631 return;
3632 }
3633
3634 if (TreeInfo.isStaticSelector(that.expr, names)) {
3635 //if the qualifier is a type, validate it; raw warning check is
3636 //omitted as we don't know at this stage as to whether this is a
3637 //raw selector (because of inference)
3638 chk.validate(that.expr, env, false);
3639 } else {
3640 Symbol lhsSym = TreeInfo.symbol(that.expr);
3641 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3642 }
3643 //attrib type-arguments
3644 List<Type> typeargtypes = List.nil();
3645 if (that.typeargs != null) {
3646 typeargtypes = attribTypes(that.typeargs, localEnv);
3647 }
3648
3649 boolean isTargetSerializable =
3650 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3651 rs.isSerializable(pt());
3652 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3653 Type currentTarget = targetInfo.target;
3654 Type desc = targetInfo.descriptor;
3655
3656 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3657 List<Type> argtypes = desc.getParameterTypes();
3658 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3659
3660 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3661 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3662 }
3663
3664 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3665 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3666 try {
3667 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3668 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3669 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3670 } finally {
3671 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3672 }
3673
3674 Symbol refSym = refResult.fst;
3675 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3676
3677 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3678 * JDK-8075541
3679 */
3680 if (refSym.kind != MTH) {
3681 boolean targetError;
3682 switch (refSym.kind) {
3683 case ABSENT_MTH:
3684 targetError = false;
3685 break;
3686 case WRONG_MTH:
3687 case WRONG_MTHS:
3688 case AMBIGUOUS:
3689 case HIDDEN:
3690 case STATICERR:
3691 targetError = true;
3692 break;
3693 default:
3694 Assert.error("unexpected result kind " + refSym.kind);
3695 targetError = false;
3696 }
3697
3698 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3699 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3700 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3701
3702 JCDiagnostic diag = diags.create(log.currentSource(), that,
3703 targetError ?
3704 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3705 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3706
3707 if (targetError && currentTarget == Type.recoveryType) {
3708 //a target error doesn't make sense during recovery stage
3709 //as we don't know what actual parameter types are
3710 result = that.type = currentTarget;
3711 return;
3712 } else {
3713 if (targetError) {
3714 resultInfo.checkContext.report(that, diag);
3715 } else {
3716 log.report(diag);
3717 }
3718 result = that.type = types.createErrorType(currentTarget);
3719 return;
3720 }
3721 }
3722
3723 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3724 that.kind = lookupHelper.referenceKind(that.sym);
3725 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3726
3727 if (desc.getReturnType() == Type.recoveryType) {
3728 // stop here
3729 result = that.type = currentTarget;
3730 return;
3731 }
3732
3733 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3734 checkNewInnerClass(that.pos(), env, exprType, false);
3735 }
3736
3737 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3738
3739 if (that.getMode() == ReferenceMode.INVOKE &&
3740 TreeInfo.isStaticSelector(that.expr, names) &&
3741 that.kind.isUnbound() &&
3742 lookupHelper.site.isRaw()) {
3743 chk.checkRaw(that.expr, localEnv);
3744 }
3745
3746 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3747 exprType.getTypeArguments().nonEmpty()) {
3748 //static ref with class type-args
3749 log.error(that.expr.pos(),
3750 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3751 Fragments.StaticMrefWithTargs));
3752 result = that.type = types.createErrorType(currentTarget);
3753 return;
3754 }
3755
3756 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3757 // Check that super-qualified symbols are not abstract (JLS)
3758 rs.checkNonAbstract(that.pos(), that.sym);
3759 }
3760
3761 if (isTargetSerializable) {
3762 chk.checkAccessFromSerializableElement(that, true);
3763 }
3764 }
3765
3766 ResultInfo checkInfo =
3767 resultInfo.dup(newMethodTemplate(
3768 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3769 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3770 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3771
3772 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3773
3774 if (that.kind.isUnbound() &&
3775 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3776 //re-generate inference constraints for unbound receiver
3777 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3778 //cannot happen as this has already been checked - we just need
3779 //to regenerate the inference constraints, as that has been lost
3780 //as a result of the call to inferenceContext.save()
3781 Assert.error("Can't get here");
3782 }
3783 }
3784
3785 if (!refType.isErroneous()) {
3786 refType = types.createMethodTypeWithReturn(refType,
3787 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3788 }
3789
3790 //go ahead with standard method reference compatibility check - note that param check
3791 //is a no-op (as this has been taken care during method applicability)
3792 boolean isSpeculativeRound =
3793 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3794
3795 that.type = currentTarget; //avoids recovery at this stage
3796 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3797 if (!isSpeculativeRound) {
3798 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3799 }
3800 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3801 } catch (Types.FunctionDescriptorLookupError ex) {
3802 JCDiagnostic cause = ex.getDiagnostic();
3803 resultInfo.checkContext.report(that, cause);
3804 result = that.type = types.createErrorType(pt());
3805 return;
3806 }
3807 }
3808 //where
3809 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3810 //if this is a constructor reference, the expected kind must be a type
3811 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3812 KindSelector.VAL_TYP : KindSelector.TYP,
3813 Type.noType);
3814 }
3815
3816
3817 @SuppressWarnings("fallthrough")
3818 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3819 InferenceContext inferenceContext = checkContext.inferenceContext();
3820 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3821
3822 Type resType;
3823 switch (tree.getMode()) {
3824 case NEW:
3825 if (!tree.expr.type.isRaw()) {
3826 resType = tree.expr.type;
3827 break;
3828 }
3829 default:
3830 resType = refType.getReturnType();
3831 }
3832
3833 Type incompatibleReturnType = resType;
3834
3835 if (returnType.hasTag(VOID)) {
3836 incompatibleReturnType = null;
3837 }
3838
3839 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3840 if (resType.isErroneous() ||
3841 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3842 checkContext.checkWarner(tree, resType, returnType))) {
3843 incompatibleReturnType = null;
3844 }
3845 }
3846
3847 if (incompatibleReturnType != null) {
3848 Fragment msg =
3849 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3850 checkContext.report(tree, diags.fragment(msg));
3851 } else {
3852 if (inferenceContext.free(refType)) {
3853 // we need to wait for inference to finish and then replace inference vars in the referent type
3854 inferenceContext.addFreeTypeListener(List.of(refType),
3855 instantiatedContext -> {
3856 tree.referentType = instantiatedContext.asInstType(refType);
3857 });
3858 } else {
3859 tree.referentType = refType;
3860 }
3861 }
3862
3863 if (!speculativeAttr) {
3864 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3865 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3866 }
3867 }
3868 }
3869
3870 boolean checkExConstraints(
3871 List<Type> thrownByFuncExpr,
3872 List<Type> thrownAtFuncType,
3873 InferenceContext inferenceContext) {
3874 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3875 * are not proper types
3876 */
3877 List<Type> nonProperList = thrownAtFuncType.stream()
3878 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3879 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3880
3881 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3882 * in the throws clause of the invocation type of the method reference's compile-time
3883 * declaration
3884 */
3885 List<Type> checkedList = thrownByFuncExpr.stream()
3886 .filter(e -> chk.isChecked(e)).collect(List.collector());
3887
3888 /** If n = 0 (the function type's throws clause consists only of proper types), then
3889 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3890 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3891 * reduces to true
3892 */
3893 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3894 for (Type checked : checkedList) {
3895 boolean isSubtype = false;
3896 for (Type proper : properList) {
3897 if (types.isSubtype(checked, proper)) {
3898 isSubtype = true;
3899 break;
3900 }
3901 }
3902 if (!isSubtype) {
3903 uncaughtByProperTypes.add(checked);
3904 }
3905 }
3906
3907 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3908 return false;
3909 }
3910
3911 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3912 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3913 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3914 */
3915 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3916 uncaughtByProperTypes.forEach(checkedEx -> {
3917 nonProperAsUndet.forEach(nonProper -> {
3918 types.isSubtype(checkedEx, nonProper);
3919 });
3920 });
3921
3922 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3923 */
3924 nonProperAsUndet.stream()
3925 .filter(t -> t.hasTag(UNDETVAR))
3926 .forEach(t -> ((UndetVar)t).setThrow());
3927 return true;
3928 }
3929
3930 /**
3931 * Set functional type info on the underlying AST. Note: as the target descriptor
3932 * might contain inference variables, we might need to register an hook in the
3933 * current inference context.
3934 */
3935 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3936 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3937 if (checkContext.inferenceContext().free(descriptorType)) {
3938 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3939 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3940 inferenceContext.asInstType(primaryTarget), checkContext));
3941 } else {
3942 fExpr.owner = env.info.scope.owner;
3943 if (pt.hasTag(CLASS)) {
3944 fExpr.target = primaryTarget;
3945 }
3946 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3947 pt != Type.recoveryType) {
3948 //check that functional interface class is well-formed
3949 try {
3950 /* Types.makeFunctionalInterfaceClass() may throw an exception
3951 * when it's executed post-inference. See the listener code
3952 * above.
3953 */
3954 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3955 names.empty, fExpr.target, ABSTRACT);
3956 if (csym != null) {
3957 chk.checkImplementations(env.tree, csym, csym);
3958 try {
3959 //perform an additional functional interface check on the synthetic class,
3960 //as there may be spurious errors for raw targets - because of existing issues
3961 //with membership and inheritance (see JDK-8074570).
3962 csym.flags_field |= INTERFACE;
3963 types.findDescriptorType(csym.type);
3964 } catch (FunctionDescriptorLookupError err) {
3965 resultInfo.checkContext.report(fExpr,
3966 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3967 }
3968 }
3969 } catch (Types.FunctionDescriptorLookupError ex) {
3970 JCDiagnostic cause = ex.getDiagnostic();
3971 resultInfo.checkContext.report(env.tree, cause);
3972 }
3973 }
3974 }
3975 }
3976
3977 public void visitParens(JCParens tree) {
3978 Type owntype = attribTree(tree.expr, env, resultInfo);
3979 result = check(tree, owntype, pkind(), resultInfo);
3980 Symbol sym = TreeInfo.symbol(tree);
3981 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3982 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3983 }
3984
3985 public void visitAssign(JCAssign tree) {
3986 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3987 Type capturedType = capture(owntype);
3988 attribExpr(tree.rhs, env, owntype);
3989 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3990 }
3991
3992 public void visitAssignop(JCAssignOp tree) {
3993 // Attribute arguments.
3994 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3995 Type operand = attribExpr(tree.rhs, env);
3996 // Find operator.
3997 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3998 if (operator != operators.noOpSymbol &&
3999 !owntype.isErroneous() &&
4000 !operand.isErroneous()) {
4001 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4002 chk.checkCastable(tree.rhs.pos(),
4003 operator.type.getReturnType(),
4004 owntype);
4005 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4006 }
4007 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4008 }
4009
4010 public void visitUnary(JCUnary tree) {
4011 // Attribute arguments.
4012 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4013 ? attribTree(tree.arg, env, varAssignmentInfo)
4014 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4015
4016 // Find operator.
4017 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4018 Type owntype = types.createErrorType(tree.type);
4019 if (operator != operators.noOpSymbol &&
4020 !argtype.isErroneous()) {
4021 owntype = (tree.getTag().isIncOrDecUnaryOp())
4022 ? tree.arg.type
4023 : operator.type.getReturnType();
4024 int opc = operator.opcode;
4025
4026 // If the argument is constant, fold it.
4027 if (argtype.constValue() != null) {
4028 Type ctype = cfolder.fold1(opc, argtype);
4029 if (ctype != null) {
4030 owntype = cfolder.coerce(ctype, owntype);
4031 }
4032 }
4033 }
4034 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4035 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4036 }
4037
4038 public void visitBinary(JCBinary tree) {
4039 // Attribute arguments.
4040 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4041 // x && y
4042 // include x's bindings when true in y
4043
4044 // x || y
4045 // include x's bindings when false in y
4046
4047 MatchBindings lhsBindings = matchBindings;
4048 List<BindingSymbol> propagatedBindings;
4049 switch (tree.getTag()) {
4050 case AND:
4051 propagatedBindings = lhsBindings.bindingsWhenTrue;
4052 break;
4053 case OR:
4054 propagatedBindings = lhsBindings.bindingsWhenFalse;
4055 break;
4056 default:
4057 propagatedBindings = List.nil();
4058 break;
4059 }
4060 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4061 Type right;
4062 try {
4063 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4064 } finally {
4065 rhsEnv.info.scope.leave();
4066 }
4067
4068 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4069
4070 // Find operator.
4071 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4072 Type owntype = types.createErrorType(tree.type);
4073 if (operator != operators.noOpSymbol &&
4074 !left.isErroneous() &&
4075 !right.isErroneous()) {
4076 owntype = operator.type.getReturnType();
4077 int opc = operator.opcode;
4078 // If both arguments are constants, fold them.
4079 if (left.constValue() != null && right.constValue() != null) {
4080 Type ctype = cfolder.fold2(opc, left, right);
4081 if (ctype != null) {
4082 owntype = cfolder.coerce(ctype, owntype);
4083 }
4084 }
4085
4086 // Check that argument types of a reference ==, != are
4087 // castable to each other, (JLS 15.21). Note: unboxing
4088 // comparisons will not have an acmp* opc at this point.
4089 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4090 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4091 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4092 }
4093 }
4094
4095 chk.checkDivZero(tree.rhs.pos(), operator, right);
4096 }
4097 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4098 }
4099
4100 public void visitTypeCast(final JCTypeCast tree) {
4101 Type clazztype = attribType(tree.clazz, env);
4102 chk.validate(tree.clazz, env, false);
4103 //a fresh environment is required for 292 inference to work properly ---
4104 //see Infer.instantiatePolymorphicSignatureInstance()
4105 Env<AttrContext> localEnv = env.dup(tree);
4106 //should we propagate the target type?
4107 final ResultInfo castInfo;
4108 JCExpression expr = TreeInfo.skipParens(tree.expr);
4109 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4110 if (isPoly) {
4111 //expression is a poly - we need to propagate target type info
4112 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4113 new Check.NestedCheckContext(resultInfo.checkContext) {
4114 @Override
4115 public boolean compatible(Type found, Type req, Warner warn) {
4116 return types.isCastable(found, req, warn);
4117 }
4118 });
4119 } else {
4120 //standalone cast - target-type info is not propagated
4121 castInfo = unknownExprInfo;
4122 }
4123 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4124 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4125 if (exprtype.constValue() != null)
4126 owntype = cfolder.coerce(exprtype, owntype);
4127 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4128 if (!isPoly)
4129 chk.checkRedundantCast(localEnv, tree);
4130 }
4131
4132 public void visitTypeTest(JCInstanceOf tree) {
4133 Type exprtype = attribExpr(tree.expr, env);
4134 if (exprtype.isPrimitive()) {
4135 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4136 } else {
4137 exprtype = chk.checkNullOrRefType(
4138 tree.expr.pos(), exprtype);
4139 }
4140 Type clazztype;
4141 JCTree typeTree;
4142 if (tree.pattern.getTag() == BINDINGPATTERN ||
4143 tree.pattern.getTag() == RECORDPATTERN) {
4144 attribExpr(tree.pattern, env, exprtype);
4145 clazztype = tree.pattern.type;
4146 if (types.isSubtype(exprtype, clazztype) &&
4147 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4148 tree.pattern.getTag() != RECORDPATTERN) {
4149 if (!allowUnconditionalPatternsInstanceOf) {
4150 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4151 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4152 }
4153 }
4154 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4155 } else {
4156 clazztype = attribType(tree.pattern, env);
4157 typeTree = tree.pattern;
4158 chk.validate(typeTree, env, false);
4159 }
4160 if (clazztype.isPrimitive()) {
4161 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4162 } else {
4163 if (!clazztype.hasTag(TYPEVAR)) {
4164 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4165 }
4166 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4167 boolean valid = false;
4168 if (allowReifiableTypesInInstanceof) {
4169 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4170 } else {
4171 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4172 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4173 allowReifiableTypesInInstanceof = true;
4174 }
4175 if (!valid) {
4176 clazztype = types.createErrorType(clazztype);
4177 }
4178 }
4179 }
4180 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4181 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4182 }
4183
4184 private boolean checkCastablePattern(DiagnosticPosition pos,
4185 Type exprType,
4186 Type pattType) {
4187 Warner warner = new Warner();
4188 // if any type is erroneous, the problem is reported elsewhere
4189 if (exprType.isErroneous() || pattType.isErroneous()) {
4190 return false;
4191 }
4192 if (!types.isCastable(exprType, pattType, warner)) {
4193 chk.basicHandler.report(pos,
4194 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4195 return false;
4196 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4197 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4198 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4199 return true;
4200 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4201 log.error(pos,
4202 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4203 return false;
4204 } else {
4205 return true;
4206 }
4207 }
4208
4209 @Override
4210 public void visitAnyPattern(JCAnyPattern tree) {
4211 result = tree.type = resultInfo.pt;
4212 }
4213
4214 public void visitBindingPattern(JCBindingPattern tree) {
4215 Type type;
4216 if (tree.var.vartype != null) {
4217 type = attribType(tree.var.vartype, env);
4218 } else {
4219 type = resultInfo.pt;
4220 }
4221 tree.type = tree.var.type = type;
4222 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4223 v.pos = tree.pos;
4224 tree.var.sym = v;
4225 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4226 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4227 }
4228 chk.validate(tree.var.vartype, env, true);
4229 if (tree.var.isImplicitlyTyped()) {
4230 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4231 : type);
4232 }
4233 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.var);
4234 if (!tree.var.isImplicitlyTyped()) {
4235 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var);
4236 }
4237 annotate.flush();
4238 result = tree.type;
4239 if (v.isUnnamedVariable()) {
4240 matchBindings = MatchBindingsComputer.EMPTY;
4241 } else {
4242 matchBindings = new MatchBindings(List.of(v), List.nil());
4243 }
4244 }
4245
4246 @Override
4247 public void visitRecordPattern(JCRecordPattern tree) {
4248 Type site;
4249
4250 if (tree.deconstructor == null) {
4251 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4252 tree.record = syms.errSymbol;
4253 site = tree.type = types.createErrorType(tree.record.type);
4254 } else {
4255 Type type = attribType(tree.deconstructor, env);
4256 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4257 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4258 if (inferred == null) {
4259 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4260 } else {
4261 type = inferred;
4262 }
4263 }
4264 tree.type = tree.deconstructor.type = type;
4265 site = types.capture(tree.type);
4266 }
4267
4268 List<Type> expectedRecordTypes;
4269 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4270 ClassSymbol record = (ClassSymbol) site.tsym;
4271 expectedRecordTypes = record.getRecordComponents()
4272 .stream()
4273 .map(rc -> types.memberType(site, rc))
4274 .map(t -> types.upward(t, types.captures(t)).baseType())
4275 .collect(List.collector());
4276 tree.record = record;
4277 } else {
4278 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4279 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4280 .limit(tree.nested.size())
4281 .collect(List.collector());
4282 tree.record = syms.errSymbol;
4283 }
4284 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4285 List<Type> recordTypes = expectedRecordTypes;
4286 List<JCPattern> nestedPatterns = tree.nested;
4287 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4288 try {
4289 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4290 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4291 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4292 outBindings.addAll(matchBindings.bindingsWhenTrue);
4293 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4294 nestedPatterns = nestedPatterns.tail;
4295 recordTypes = recordTypes.tail;
4296 }
4297 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4298 while (nestedPatterns.nonEmpty()) {
4299 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4300 nestedPatterns = nestedPatterns.tail;
4301 }
4302 List<Type> nestedTypes =
4303 tree.nested.stream().map(p -> p.type).collect(List.collector());
4304 log.error(tree.pos(),
4305 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4306 nestedTypes));
4307 }
4308 } finally {
4309 localEnv.info.scope.leave();
4310 }
4311 chk.validate(tree.deconstructor, env, true);
4312 result = tree.type;
4313 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4314 }
4315
4316 public void visitIndexed(JCArrayAccess tree) {
4317 Type owntype = types.createErrorType(tree.type);
4318 Type atype = attribExpr(tree.indexed, env);
4319 attribExpr(tree.index, env, syms.intType);
4320 if (types.isArray(atype))
4321 owntype = types.elemtype(atype);
4322 else if (!atype.hasTag(ERROR))
4323 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4324 if (!pkind().contains(KindSelector.VAL))
4325 owntype = capture(owntype);
4326 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4327 }
4328
4329 public void visitIdent(JCIdent tree) {
4330 Symbol sym;
4331
4332 // Find symbol
4333 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4334 // If we are looking for a method, the prototype `pt' will be a
4335 // method type with the type of the call's arguments as parameters.
4336 env.info.pendingResolutionPhase = null;
4337 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4338 } else if (tree.sym != null && tree.sym.kind != VAR) {
4339 sym = tree.sym;
4340 } else {
4341 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4342 }
4343 tree.sym = sym;
4344
4345 // Also find the environment current for the class where
4346 // sym is defined (`symEnv').
4347 Env<AttrContext> symEnv = env;
4348 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4349 sym.kind.matches(KindSelector.VAL_MTH) &&
4350 sym.owner.kind == TYP &&
4351 tree.name != names._this && tree.name != names._super) {
4352
4353 // Find environment in which identifier is defined.
4354 while (symEnv.outer != null &&
4355 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4356 symEnv = symEnv.outer;
4357 }
4358 }
4359
4360 // If symbol is a variable, ...
4361 if (sym.kind == VAR) {
4362 VarSymbol v = (VarSymbol)sym;
4363
4364 // ..., evaluate its initializer, if it has one, and check for
4365 // illegal forward reference.
4366 checkInit(tree, env, v, false);
4367
4368 // If we are expecting a variable (as opposed to a value), check
4369 // that the variable is assignable in the current environment.
4370 if (KindSelector.ASG.subset(pkind()))
4371 checkAssignable(tree.pos(), v, null, env);
4372 }
4373
4374 Env<AttrContext> env1 = env;
4375 if (sym.kind != ERR && sym.kind != TYP &&
4376 sym.owner != null && sym.owner != env1.enclClass.sym) {
4377 // If the found symbol is inaccessible, then it is
4378 // accessed through an enclosing instance. Locate this
4379 // enclosing instance:
4380 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4381 env1 = env1.outer;
4382 }
4383
4384 if (env.info.isSerializable) {
4385 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4386 }
4387
4388 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4389 }
4390
4391 public void visitSelect(JCFieldAccess tree) {
4392 // Determine the expected kind of the qualifier expression.
4393 KindSelector skind = KindSelector.NIL;
4394 if (tree.name == names._this || tree.name == names._super ||
4395 tree.name == names._class)
4396 {
4397 skind = KindSelector.TYP;
4398 } else {
4399 if (pkind().contains(KindSelector.PCK))
4400 skind = KindSelector.of(skind, KindSelector.PCK);
4401 if (pkind().contains(KindSelector.TYP))
4402 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4403 if (pkind().contains(KindSelector.VAL_MTH))
4404 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4405 }
4406
4407 // Attribute the qualifier expression, and determine its symbol (if any).
4408 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4409 Assert.check(site == tree.selected.type);
4410 if (!pkind().contains(KindSelector.TYP_PCK))
4411 site = capture(site); // Capture field access
4412
4413 // don't allow T.class T[].class, etc
4414 if (skind == KindSelector.TYP) {
4415 Type elt = site;
4416 while (elt.hasTag(ARRAY))
4417 elt = ((ArrayType)elt).elemtype;
4418 if (elt.hasTag(TYPEVAR)) {
4419 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4420 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4421 tree.sym = tree.type.tsym;
4422 return ;
4423 }
4424 }
4425
4426 // If qualifier symbol is a type or `super', assert `selectSuper'
4427 // for the selection. This is relevant for determining whether
4428 // protected symbols are accessible.
4429 Symbol sitesym = TreeInfo.symbol(tree.selected);
4430 boolean selectSuperPrev = env.info.selectSuper;
4431 env.info.selectSuper =
4432 sitesym != null &&
4433 sitesym.name == names._super;
4434
4435 // Determine the symbol represented by the selection.
4436 env.info.pendingResolutionPhase = null;
4437 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4438 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4439 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4440 sym = syms.errSymbol;
4441 }
4442 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4443 site = capture(site);
4444 sym = selectSym(tree, sitesym, site, env, resultInfo);
4445 }
4446 boolean varArgs = env.info.lastResolveVarargs();
4447 tree.sym = sym;
4448
4449 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4450 site = types.skipTypeVars(site, true);
4451 }
4452
4453 // If that symbol is a variable, ...
4454 if (sym.kind == VAR) {
4455 VarSymbol v = (VarSymbol)sym;
4456
4457 // ..., evaluate its initializer, if it has one, and check for
4458 // illegal forward reference.
4459 checkInit(tree, env, v, true);
4460
4461 // If we are expecting a variable (as opposed to a value), check
4462 // that the variable is assignable in the current environment.
4463 if (KindSelector.ASG.subset(pkind()))
4464 checkAssignable(tree.pos(), v, tree.selected, env);
4465 }
4466
4467 if (sitesym != null &&
4468 sitesym.kind == VAR &&
4469 ((VarSymbol)sitesym).isResourceVariable() &&
4470 sym.kind == MTH &&
4471 sym.name.equals(names.close) &&
4472 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4473 env.info.lint.logIfEnabled(tree, LintWarnings.TryExplicitCloseCall);
4474 }
4475
4476 // Disallow selecting a type from an expression
4477 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4478 tree.type = check(tree.selected, pt(),
4479 sitesym == null ?
4480 KindSelector.VAL : sitesym.kind.toSelector(),
4481 new ResultInfo(KindSelector.TYP_PCK, pt()));
4482 }
4483
4484 if (isType(sitesym)) {
4485 if (sym.name != names._this && sym.name != names._super) {
4486 // Check if type-qualified fields or methods are static (JLS)
4487 if ((sym.flags() & STATIC) == 0 &&
4488 sym.name != names._super &&
4489 (sym.kind == VAR || sym.kind == MTH)) {
4490 rs.accessBase(rs.new StaticError(sym),
4491 tree.pos(), site, sym.name, true);
4492 }
4493 }
4494 } else if (sym.kind != ERR &&
4495 (sym.flags() & STATIC) != 0 &&
4496 sym.name != names._class) {
4497 // If the qualified item is not a type and the selected item is static, report
4498 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4499 if (!sym.owner.isAnonymous()) {
4500 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4501 } else {
4502 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4503 }
4504 }
4505
4506 // If we are selecting an instance member via a `super', ...
4507 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4508
4509 // Check that super-qualified symbols are not abstract (JLS)
4510 rs.checkNonAbstract(tree.pos(), sym);
4511
4512 if (site.isRaw()) {
4513 // Determine argument types for site.
4514 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4515 if (site1 != null) site = site1;
4516 }
4517 }
4518
4519 if (env.info.isSerializable) {
4520 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4521 }
4522
4523 env.info.selectSuper = selectSuperPrev;
4524 result = checkId(tree, site, sym, env, resultInfo);
4525 }
4526 //where
4527 /** Determine symbol referenced by a Select expression,
4528 *
4529 * @param tree The select tree.
4530 * @param site The type of the selected expression,
4531 * @param env The current environment.
4532 * @param resultInfo The current result.
4533 */
4534 private Symbol selectSym(JCFieldAccess tree,
4535 Symbol location,
4536 Type site,
4537 Env<AttrContext> env,
4538 ResultInfo resultInfo) {
4539 DiagnosticPosition pos = tree.pos();
4540 Name name = tree.name;
4541 switch (site.getTag()) {
4542 case PACKAGE:
4543 return rs.accessBase(
4544 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4545 pos, location, site, name, true);
4546 case ARRAY:
4547 case CLASS:
4548 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4549 return rs.resolveQualifiedMethod(
4550 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4551 } else if (name == names._this || name == names._super) {
4552 return rs.resolveSelf(pos, env, site.tsym, name);
4553 } else if (name == names._class) {
4554 // In this case, we have already made sure in
4555 // visitSelect that qualifier expression is a type.
4556 return syms.getClassField(site, types);
4557 } else {
4558 // We are seeing a plain identifier as selector.
4559 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4560 sym = rs.accessBase(sym, pos, location, site, name, true);
4561 return sym;
4562 }
4563 case WILDCARD:
4564 throw new AssertionError(tree);
4565 case TYPEVAR:
4566 // Normally, site.getUpperBound() shouldn't be null.
4567 // It should only happen during memberEnter/attribBase
4568 // when determining the supertype which *must* be
4569 // done before attributing the type variables. In
4570 // other words, we are seeing this illegal program:
4571 // class B<T> extends A<T.foo> {}
4572 Symbol sym = (site.getUpperBound() != null)
4573 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4574 : null;
4575 if (sym == null) {
4576 log.error(pos, Errors.TypeVarCantBeDeref);
4577 return syms.errSymbol;
4578 } else {
4579 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4580 rs.new AccessError(env, site, sym) :
4581 sym;
4582 rs.accessBase(sym2, pos, location, site, name, true);
4583 return sym;
4584 }
4585 case ERROR:
4586 // preserve identifier names through errors
4587 return types.createErrorType(name, site.tsym, site).tsym;
4588 default:
4589 // The qualifier expression is of a primitive type -- only
4590 // .class is allowed for these.
4591 if (name == names._class) {
4592 // In this case, we have already made sure in Select that
4593 // qualifier expression is a type.
4594 return syms.getClassField(site, types);
4595 } else {
4596 log.error(pos, Errors.CantDeref(site));
4597 return syms.errSymbol;
4598 }
4599 }
4600 }
4601
4602 /** Determine type of identifier or select expression and check that
4603 * (1) the referenced symbol is not deprecated
4604 * (2) the symbol's type is safe (@see checkSafe)
4605 * (3) if symbol is a variable, check that its type and kind are
4606 * compatible with the prototype and protokind.
4607 * (4) if symbol is an instance field of a raw type,
4608 * which is being assigned to, issue an unchecked warning if its
4609 * type changes under erasure.
4610 * (5) if symbol is an instance method of a raw type, issue an
4611 * unchecked warning if its argument types change under erasure.
4612 * If checks succeed:
4613 * If symbol is a constant, return its constant type
4614 * else if symbol is a method, return its result type
4615 * otherwise return its type.
4616 * Otherwise return errType.
4617 *
4618 * @param tree The syntax tree representing the identifier
4619 * @param site If this is a select, the type of the selected
4620 * expression, otherwise the type of the current class.
4621 * @param sym The symbol representing the identifier.
4622 * @param env The current environment.
4623 * @param resultInfo The expected result
4624 */
4625 Type checkId(JCTree tree,
4626 Type site,
4627 Symbol sym,
4628 Env<AttrContext> env,
4629 ResultInfo resultInfo) {
4630 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4631 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4632 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4633 }
4634
4635 Type checkMethodIdInternal(JCTree tree,
4636 Type site,
4637 Symbol sym,
4638 Env<AttrContext> env,
4639 ResultInfo resultInfo) {
4640 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4641 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4642 } else {
4643 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4644 }
4645 }
4646
4647 Type checkIdInternal(JCTree tree,
4648 Type site,
4649 Symbol sym,
4650 Type pt,
4651 Env<AttrContext> env,
4652 ResultInfo resultInfo) {
4653 Type owntype; // The computed type of this identifier occurrence.
4654 switch (sym.kind) {
4655 case TYP:
4656 // For types, the computed type equals the symbol's type,
4657 // except for two situations:
4658 owntype = sym.type;
4659 if (owntype.hasTag(CLASS)) {
4660 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4661 Type ownOuter = owntype.getEnclosingType();
4662
4663 // (a) If the symbol's type is parameterized, erase it
4664 // because no type parameters were given.
4665 // We recover generic outer type later in visitTypeApply.
4666 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4667 owntype = types.erasure(owntype);
4668 }
4669
4670 // (b) If the symbol's type is an inner class, then
4671 // we have to interpret its outer type as a superclass
4672 // of the site type. Example:
4673 //
4674 // class Tree<A> { class Visitor { ... } }
4675 // class PointTree extends Tree<Point> { ... }
4676 // ...PointTree.Visitor...
4677 //
4678 // Then the type of the last expression above is
4679 // Tree<Point>.Visitor.
4680 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4681 Type normOuter = site;
4682 if (normOuter.hasTag(CLASS)) {
4683 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4684 }
4685 if (normOuter == null) // perhaps from an import
4686 normOuter = types.erasure(ownOuter);
4687 if (normOuter != ownOuter)
4688 owntype = new ClassType(
4689 normOuter, List.nil(), owntype.tsym,
4690 owntype.getMetadata());
4691 }
4692 }
4693 break;
4694 case VAR:
4695 VarSymbol v = (VarSymbol)sym;
4696
4697 if (env.info.enclVar != null
4698 && v.type.hasTag(NONE)) {
4699 //self reference to implicitly typed variable declaration
4700 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4701 return tree.type = v.type = types.createErrorType(v.type);
4702 }
4703
4704 // Test (4): if symbol is an instance field of a raw type,
4705 // which is being assigned to, issue an unchecked warning if
4706 // its type changes under erasure.
4707 if (KindSelector.ASG.subset(pkind()) &&
4708 v.owner.kind == TYP &&
4709 (v.flags() & STATIC) == 0 &&
4710 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4711 Type s = types.asOuterSuper(site, v.owner);
4712 if (s != null &&
4713 s.isRaw() &&
4714 !types.isSameType(v.type, v.erasure(types))) {
4715 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4716 }
4717 }
4718 // The computed type of a variable is the type of the
4719 // variable symbol, taken as a member of the site type.
4720 owntype = (sym.owner.kind == TYP &&
4721 sym.name != names._this && sym.name != names._super)
4722 ? types.memberType(site, sym)
4723 : sym.type;
4724
4725 // If the variable is a constant, record constant value in
4726 // computed type.
4727 if (v.getConstValue() != null && isStaticReference(tree))
4728 owntype = owntype.constType(v.getConstValue());
4729
4730 if (resultInfo.pkind == KindSelector.VAL) {
4731 owntype = capture(owntype); // capture "names as expressions"
4732 }
4733 break;
4734 case MTH: {
4735 owntype = checkMethod(site, sym,
4736 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4737 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4738 resultInfo.pt.getTypeArguments());
4739 chk.checkRestricted(tree.pos(), sym);
4740 break;
4741 }
4742 case PCK: case ERR:
4743 owntype = sym.type;
4744 break;
4745 default:
4746 throw new AssertionError("unexpected kind: " + sym.kind +
4747 " in tree " + tree);
4748 }
4749
4750 // Emit a `deprecation' warning if symbol is deprecated.
4751 // (for constructors (but not for constructor references), the error
4752 // was given when the constructor was resolved)
4753
4754 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4755 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4756 chk.checkSunAPI(tree.pos(), sym);
4757 chk.checkProfile(tree.pos(), sym);
4758 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4759 }
4760
4761 if (pt.isErroneous()) {
4762 owntype = types.createErrorType(owntype);
4763 }
4764
4765 // If symbol is a variable, check that its type and
4766 // kind are compatible with the prototype and protokind.
4767 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4768 }
4769
4770 /** Check that variable is initialized and evaluate the variable's
4771 * initializer, if not yet done. Also check that variable is not
4772 * referenced before it is defined.
4773 * @param tree The tree making up the variable reference.
4774 * @param env The current environment.
4775 * @param v The variable's symbol.
4776 */
4777 private void checkInit(JCTree tree,
4778 Env<AttrContext> env,
4779 VarSymbol v,
4780 boolean onlyWarning) {
4781 // A forward reference is diagnosed if the declaration position
4782 // of the variable is greater than the current tree position
4783 // and the tree and variable definition occur in the same class
4784 // definition. Note that writes don't count as references.
4785 // This check applies only to class and instance
4786 // variables. Local variables follow different scope rules,
4787 // and are subject to definite assignment checking.
4788 Env<AttrContext> initEnv = enclosingInitEnv(env);
4789 if (initEnv != null &&
4790 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4791 v.owner.kind == TYP &&
4792 v.owner == env.info.scope.owner.enclClass() &&
4793 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4794 (!env.tree.hasTag(ASSIGN) ||
4795 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4796 if (!onlyWarning || isStaticEnumField(v)) {
4797 Error errkey = (initEnv.info.enclVar == v) ?
4798 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4799 log.error(tree.pos(), errkey);
4800 } else if (useBeforeDeclarationWarning) {
4801 Warning warnkey = (initEnv.info.enclVar == v) ?
4802 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4803 log.warning(tree.pos(), warnkey);
4804 }
4805 }
4806
4807 v.getConstValue(); // ensure initializer is evaluated
4808
4809 checkEnumInitializer(tree, env, v);
4810 }
4811
4812 /**
4813 * Returns the enclosing init environment associated with this env (if any). An init env
4814 * can be either a field declaration env or a static/instance initializer env.
4815 */
4816 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4817 while (true) {
4818 switch (env.tree.getTag()) {
4819 case VARDEF:
4820 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4821 if (vdecl.sym.owner.kind == TYP) {
4822 //field
4823 return env;
4824 }
4825 break;
4826 case BLOCK:
4827 if (env.next.tree.hasTag(CLASSDEF)) {
4828 //instance/static initializer
4829 return env;
4830 }
4831 break;
4832 case METHODDEF:
4833 case CLASSDEF:
4834 case TOPLEVEL:
4835 return null;
4836 }
4837 Assert.checkNonNull(env.next);
4838 env = env.next;
4839 }
4840 }
4841
4842 /**
4843 * Check for illegal references to static members of enum. In
4844 * an enum type, constructors and initializers may not
4845 * reference its static members unless they are constant.
4846 *
4847 * @param tree The tree making up the variable reference.
4848 * @param env The current environment.
4849 * @param v The variable's symbol.
4850 * @jls 8.9 Enum Types
4851 */
4852 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4853 // JLS:
4854 //
4855 // "It is a compile-time error to reference a static field
4856 // of an enum type that is not a compile-time constant
4857 // (15.28) from constructors, instance initializer blocks,
4858 // or instance variable initializer expressions of that
4859 // type. It is a compile-time error for the constructors,
4860 // instance initializer blocks, or instance variable
4861 // initializer expressions of an enum constant e to refer
4862 // to itself or to an enum constant of the same type that
4863 // is declared to the right of e."
4864 if (isStaticEnumField(v)) {
4865 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4866
4867 if (enclClass == null || enclClass.owner == null)
4868 return;
4869
4870 // See if the enclosing class is the enum (or a
4871 // subclass thereof) declaring v. If not, this
4872 // reference is OK.
4873 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4874 return;
4875
4876 // If the reference isn't from an initializer, then
4877 // the reference is OK.
4878 if (!Resolve.isInitializer(env))
4879 return;
4880
4881 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4882 }
4883 }
4884
4885 /** Is the given symbol a static, non-constant field of an Enum?
4886 * Note: enum literals should not be regarded as such
4887 */
4888 private boolean isStaticEnumField(VarSymbol v) {
4889 return Flags.isEnum(v.owner) &&
4890 Flags.isStatic(v) &&
4891 !Flags.isConstant(v) &&
4892 v.name != names._class;
4893 }
4894
4895 /**
4896 * Check that method arguments conform to its instantiation.
4897 **/
4898 public Type checkMethod(Type site,
4899 final Symbol sym,
4900 ResultInfo resultInfo,
4901 Env<AttrContext> env,
4902 final List<JCExpression> argtrees,
4903 List<Type> argtypes,
4904 List<Type> typeargtypes) {
4905 // Test (5): if symbol is an instance method of a raw type, issue
4906 // an unchecked warning if its argument types change under erasure.
4907 if ((sym.flags() & STATIC) == 0 &&
4908 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4909 Type s = types.asOuterSuper(site, sym.owner);
4910 if (s != null && s.isRaw() &&
4911 !types.isSameTypes(sym.type.getParameterTypes(),
4912 sym.erasure(types).getParameterTypes())) {
4913 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
4914 }
4915 }
4916
4917 if (env.info.defaultSuperCallSite != null) {
4918 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4919 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4920 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4921 List<MethodSymbol> icand_sup =
4922 types.interfaceCandidates(sup, (MethodSymbol)sym);
4923 if (icand_sup.nonEmpty() &&
4924 icand_sup.head != sym &&
4925 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4926 log.error(env.tree.pos(),
4927 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4928 break;
4929 }
4930 }
4931 env.info.defaultSuperCallSite = null;
4932 }
4933
4934 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4935 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4936 if (app.meth.hasTag(SELECT) &&
4937 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4938 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4939 }
4940 }
4941
4942 // Compute the identifier's instantiated type.
4943 // For methods, we need to compute the instance type by
4944 // Resolve.instantiate from the symbol's type as well as
4945 // any type arguments and value arguments.
4946 Warner noteWarner = new Warner();
4947 try {
4948 Type owntype = rs.checkMethod(
4949 env,
4950 site,
4951 sym,
4952 resultInfo,
4953 argtypes,
4954 typeargtypes,
4955 noteWarner);
4956
4957 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4958 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4959
4960 argtypes = argtypes.map(checkDeferredMap);
4961
4962 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4963 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
4964 sym.name,
4965 rs.methodArguments(sym.type.getParameterTypes()),
4966 rs.methodArguments(argtypes.map(checkDeferredMap)),
4967 kindName(sym.location()),
4968 sym.location()));
4969 if (resultInfo.pt != Infer.anyPoly ||
4970 !owntype.hasTag(METHOD) ||
4971 !owntype.isPartial()) {
4972 //if this is not a partially inferred method type, erase return type. Otherwise,
4973 //erasure is carried out in PartiallyInferredMethodType.check().
4974 owntype = new MethodType(owntype.getParameterTypes(),
4975 types.erasure(owntype.getReturnType()),
4976 types.erasure(owntype.getThrownTypes()),
4977 syms.methodClass);
4978 }
4979 }
4980
4981 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4982 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4983 PolyKind.POLY : PolyKind.STANDALONE;
4984 TreeInfo.setPolyKind(env.tree, pkind);
4985
4986 return (resultInfo.pt == Infer.anyPoly) ?
4987 owntype :
4988 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4989 resultInfo.checkContext.inferenceContext());
4990 } catch (Infer.InferenceException ex) {
4991 //invalid target type - propagate exception outwards or report error
4992 //depending on the current check context
4993 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4994 return types.createErrorType(site);
4995 } catch (Resolve.InapplicableMethodException ex) {
4996 final JCDiagnostic diag = ex.getDiagnostic();
4997 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4998 @Override
4999 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5000 return new Pair<>(sym, diag);
5001 }
5002 };
5003 List<Type> argtypes2 = argtypes.map(
5004 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5005 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5006 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5007 log.report(errDiag);
5008 return types.createErrorType(site);
5009 }
5010 }
5011
5012 public void visitLiteral(JCLiteral tree) {
5013 result = check(tree, litType(tree.typetag).constType(tree.value),
5014 KindSelector.VAL, resultInfo);
5015 }
5016 //where
5017 /** Return the type of a literal with given type tag.
5018 */
5019 Type litType(TypeTag tag) {
5020 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5021 }
5022
5023 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5024 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5025 }
5026
5027 public void visitTypeArray(JCArrayTypeTree tree) {
5028 Type etype = attribType(tree.elemtype, env);
5029 Type type = new ArrayType(etype, syms.arrayClass);
5030 result = check(tree, type, KindSelector.TYP, resultInfo);
5031 }
5032
5033 /** Visitor method for parameterized types.
5034 * Bound checking is left until later, since types are attributed
5035 * before supertype structure is completely known
5036 */
5037 public void visitTypeApply(JCTypeApply tree) {
5038 Type owntype = types.createErrorType(tree.type);
5039
5040 // Attribute functor part of application and make sure it's a class.
5041 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5042
5043 // Attribute type parameters
5044 List<Type> actuals = attribTypes(tree.arguments, env);
5045
5046 if (clazztype.hasTag(CLASS)) {
5047 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5048 if (actuals.isEmpty()) //diamond
5049 actuals = formals;
5050
5051 if (actuals.length() == formals.length()) {
5052 List<Type> a = actuals;
5053 List<Type> f = formals;
5054 while (a.nonEmpty()) {
5055 a.head = a.head.withTypeVar(f.head);
5056 a = a.tail;
5057 f = f.tail;
5058 }
5059 // Compute the proper generic outer
5060 Type clazzOuter = clazztype.getEnclosingType();
5061 if (clazzOuter.hasTag(CLASS)) {
5062 Type site;
5063 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5064 if (clazz.hasTag(IDENT)) {
5065 site = env.enclClass.sym.type;
5066 } else if (clazz.hasTag(SELECT)) {
5067 site = ((JCFieldAccess) clazz).selected.type;
5068 } else throw new AssertionError(""+tree);
5069 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5070 if (site.hasTag(CLASS))
5071 site = types.asOuterSuper(site, clazzOuter.tsym);
5072 if (site == null)
5073 site = types.erasure(clazzOuter);
5074 clazzOuter = site;
5075 }
5076 }
5077 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5078 clazztype.getMetadata());
5079 } else {
5080 if (formals.length() != 0) {
5081 log.error(tree.pos(),
5082 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5083 } else {
5084 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5085 }
5086 owntype = types.createErrorType(tree.type);
5087 }
5088 } else if (clazztype.hasTag(ERROR)) {
5089 ErrorType parameterizedErroneous =
5090 new ErrorType(clazztype.getOriginalType(),
5091 clazztype.tsym,
5092 clazztype.getMetadata());
5093
5094 parameterizedErroneous.typarams_field = actuals;
5095 owntype = parameterizedErroneous;
5096 }
5097 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5098 }
5099
5100 public void visitTypeUnion(JCTypeUnion tree) {
5101 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5102 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5103 for (JCExpression typeTree : tree.alternatives) {
5104 Type ctype = attribType(typeTree, env);
5105 ctype = chk.checkType(typeTree.pos(),
5106 chk.checkClassType(typeTree.pos(), ctype),
5107 syms.throwableType);
5108 if (!ctype.isErroneous()) {
5109 //check that alternatives of a union type are pairwise
5110 //unrelated w.r.t. subtyping
5111 if (chk.intersects(ctype, multicatchTypes.toList())) {
5112 for (Type t : multicatchTypes) {
5113 boolean sub = types.isSubtype(ctype, t);
5114 boolean sup = types.isSubtype(t, ctype);
5115 if (sub || sup) {
5116 //assume 'a' <: 'b'
5117 Type a = sub ? ctype : t;
5118 Type b = sub ? t : ctype;
5119 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5120 }
5121 }
5122 }
5123 multicatchTypes.append(ctype);
5124 if (all_multicatchTypes != null)
5125 all_multicatchTypes.append(ctype);
5126 } else {
5127 if (all_multicatchTypes == null) {
5128 all_multicatchTypes = new ListBuffer<>();
5129 all_multicatchTypes.appendList(multicatchTypes);
5130 }
5131 all_multicatchTypes.append(ctype);
5132 }
5133 }
5134 Type t = check(tree, types.lub(multicatchTypes.toList()),
5135 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5136 if (t.hasTag(CLASS)) {
5137 List<Type> alternatives =
5138 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5139 t = new UnionClassType((ClassType) t, alternatives);
5140 }
5141 tree.type = result = t;
5142 }
5143
5144 public void visitTypeIntersection(JCTypeIntersection tree) {
5145 attribTypes(tree.bounds, env);
5146 tree.type = result = checkIntersection(tree, tree.bounds);
5147 }
5148
5149 public void visitTypeParameter(JCTypeParameter tree) {
5150 TypeVar typeVar = (TypeVar) tree.type;
5151
5152 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5153 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5154 }
5155
5156 if (!typeVar.getUpperBound().isErroneous()) {
5157 //fixup type-parameter bound computed in 'attribTypeVariables'
5158 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5159 }
5160 }
5161
5162 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5163 Set<Symbol> boundSet = new HashSet<>();
5164 if (bounds.nonEmpty()) {
5165 // accept class or interface or typevar as first bound.
5166 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5167 boundSet.add(types.erasure(bounds.head.type).tsym);
5168 if (bounds.head.type.isErroneous()) {
5169 return bounds.head.type;
5170 }
5171 else if (bounds.head.type.hasTag(TYPEVAR)) {
5172 // if first bound was a typevar, do not accept further bounds.
5173 if (bounds.tail.nonEmpty()) {
5174 log.error(bounds.tail.head.pos(),
5175 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5176 return bounds.head.type;
5177 }
5178 } else {
5179 // if first bound was a class or interface, accept only interfaces
5180 // as further bounds.
5181 for (JCExpression bound : bounds.tail) {
5182 bound.type = checkBase(bound.type, bound, env, false, true, false);
5183 if (bound.type.isErroneous()) {
5184 bounds = List.of(bound);
5185 }
5186 else if (bound.type.hasTag(CLASS)) {
5187 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5188 }
5189 }
5190 }
5191 }
5192
5193 if (bounds.length() == 0) {
5194 return syms.objectType;
5195 } else if (bounds.length() == 1) {
5196 return bounds.head.type;
5197 } else {
5198 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5199 // ... the variable's bound is a class type flagged COMPOUND
5200 // (see comment for TypeVar.bound).
5201 // In this case, generate a class tree that represents the
5202 // bound class, ...
5203 JCExpression extending;
5204 List<JCExpression> implementing;
5205 if (!bounds.head.type.isInterface()) {
5206 extending = bounds.head;
5207 implementing = bounds.tail;
5208 } else {
5209 extending = null;
5210 implementing = bounds;
5211 }
5212 JCClassDecl cd = make.at(tree).ClassDef(
5213 make.Modifiers(PUBLIC | ABSTRACT),
5214 names.empty, List.nil(),
5215 extending, implementing, List.nil());
5216
5217 ClassSymbol c = (ClassSymbol)owntype.tsym;
5218 Assert.check((c.flags() & COMPOUND) != 0);
5219 cd.sym = c;
5220 c.sourcefile = env.toplevel.sourcefile;
5221
5222 // ... and attribute the bound class
5223 c.flags_field |= UNATTRIBUTED;
5224 Env<AttrContext> cenv = enter.classEnv(cd, env);
5225 typeEnvs.put(c, cenv);
5226 attribClass(c);
5227 return owntype;
5228 }
5229 }
5230
5231 public void visitWildcard(JCWildcard tree) {
5232 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5233 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5234 ? syms.objectType
5235 : attribType(tree.inner, env);
5236 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5237 tree.kind.kind,
5238 syms.boundClass),
5239 KindSelector.TYP, resultInfo);
5240 }
5241
5242 public void visitAnnotation(JCAnnotation tree) {
5243 Assert.error("should be handled in annotate");
5244 }
5245
5246 @Override
5247 public void visitModifiers(JCModifiers tree) {
5248 //error recovery only:
5249 Assert.check(resultInfo.pkind == KindSelector.ERR);
5250
5251 attribAnnotationTypes(tree.annotations, env);
5252 }
5253
5254 public void visitAnnotatedType(JCAnnotatedType tree) {
5255 attribAnnotationTypes(tree.annotations, env);
5256 Type underlyingType = attribType(tree.underlyingType, env);
5257 Type annotatedType = underlyingType.preannotatedType();
5258
5259 if (!env.info.isNewClass)
5260 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5261 result = tree.type = annotatedType;
5262 }
5263
5264 public void visitErroneous(JCErroneous tree) {
5265 if (tree.errs != null) {
5266 WriteableScope newScope = env.info.scope;
5267
5268 if (env.tree instanceof JCClassDecl) {
5269 Symbol fakeOwner =
5270 new MethodSymbol(BLOCK, names.empty, null,
5271 env.info.scope.owner);
5272 newScope = newScope.dupUnshared(fakeOwner);
5273 }
5274
5275 Env<AttrContext> errEnv =
5276 env.dup(env.tree,
5277 env.info.dup(newScope));
5278 errEnv.info.returnResult = unknownExprInfo;
5279 for (JCTree err : tree.errs)
5280 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5281 }
5282 result = tree.type = syms.errType;
5283 }
5284
5285 /** Default visitor method for all other trees.
5286 */
5287 public void visitTree(JCTree tree) {
5288 throw new AssertionError();
5289 }
5290
5291 /**
5292 * Attribute an env for either a top level tree or class or module declaration.
5293 */
5294 public void attrib(Env<AttrContext> env) {
5295 switch (env.tree.getTag()) {
5296 case MODULEDEF:
5297 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5298 break;
5299 case PACKAGEDEF:
5300 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5301 break;
5302 default:
5303 attribClass(env.tree.pos(), env.enclClass.sym);
5304 }
5305
5306 annotate.flush();
5307 }
5308
5309 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5310 try {
5311 annotate.flush();
5312 attribPackage(p);
5313 } catch (CompletionFailure ex) {
5314 chk.completionError(pos, ex);
5315 }
5316 }
5317
5318 void attribPackage(PackageSymbol p) {
5319 attribWithLint(p,
5320 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5321 }
5322
5323 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5324 try {
5325 annotate.flush();
5326 attribModule(m);
5327 } catch (CompletionFailure ex) {
5328 chk.completionError(pos, ex);
5329 }
5330 }
5331
5332 void attribModule(ModuleSymbol m) {
5333 attribWithLint(m, env -> attribStat(env.tree, env));
5334 }
5335
5336 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5337 Env<AttrContext> env = typeEnvs.get(sym);
5338
5339 Env<AttrContext> lintEnv = env;
5340 while (lintEnv.info.lint == null)
5341 lintEnv = lintEnv.next;
5342
5343 Lint lint = lintEnv.info.lint.augment(sym);
5344
5345 Lint prevLint = chk.setLint(lint);
5346 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5347
5348 try {
5349 deferredLintHandler.flush(env.tree, lint);
5350 attrib.accept(env);
5351 } finally {
5352 log.useSource(prev);
5353 chk.setLint(prevLint);
5354 }
5355 }
5356
5357 /** Main method: attribute class definition associated with given class symbol.
5358 * reporting completion failures at the given position.
5359 * @param pos The source position at which completion errors are to be
5360 * reported.
5361 * @param c The class symbol whose definition will be attributed.
5362 */
5363 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5364 try {
5365 annotate.flush();
5366 attribClass(c);
5367 } catch (CompletionFailure ex) {
5368 chk.completionError(pos, ex);
5369 }
5370 }
5371
5372 /** Attribute class definition associated with given class symbol.
5373 * @param c The class symbol whose definition will be attributed.
5374 */
5375 void attribClass(ClassSymbol c) throws CompletionFailure {
5376 if (c.type.hasTag(ERROR)) return;
5377
5378 // Check for cycles in the inheritance graph, which can arise from
5379 // ill-formed class files.
5380 chk.checkNonCyclic(null, c.type);
5381
5382 Type st = types.supertype(c.type);
5383 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5384 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5385 // First, attribute superclass.
5386 if (st.hasTag(CLASS))
5387 attribClass((ClassSymbol)st.tsym);
5388
5389 // Next attribute owner, if it is a class.
5390 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5391 attribClass((ClassSymbol)c.owner);
5392
5393 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5394 }
5395
5396 // The previous operations might have attributed the current class
5397 // if there was a cycle. So we test first whether the class is still
5398 // UNATTRIBUTED.
5399 if ((c.flags_field & UNATTRIBUTED) != 0) {
5400 c.flags_field &= ~UNATTRIBUTED;
5401
5402 // Get environment current at the point of class definition.
5403 Env<AttrContext> env = typeEnvs.get(c);
5404
5405 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5406 // because the annotations were not available at the time the env was created. Therefore,
5407 // we look up the environment chain for the first enclosing environment for which the
5408 // lint value is set. Typically, this is the parent env, but might be further if there
5409 // are any envs created as a result of TypeParameter nodes.
5410 Env<AttrContext> lintEnv = env;
5411 while (lintEnv.info.lint == null)
5412 lintEnv = lintEnv.next;
5413
5414 // Having found the enclosing lint value, we can initialize the lint value for this class
5415 env.info.lint = lintEnv.info.lint.augment(c);
5416
5417 Lint prevLint = chk.setLint(env.info.lint);
5418 JavaFileObject prev = log.useSource(c.sourcefile);
5419 ResultInfo prevReturnRes = env.info.returnResult;
5420
5421 try {
5422 if (c.isSealed() &&
5423 !c.isEnum() &&
5424 !c.isPermittedExplicit &&
5425 c.getPermittedSubclasses().isEmpty()) {
5426 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5427 }
5428
5429 if (c.isSealed()) {
5430 Set<Symbol> permittedTypes = new HashSet<>();
5431 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5432 for (Type subType : c.getPermittedSubclasses()) {
5433 if (subType.isErroneous()) {
5434 // the type already caused errors, don't produce more potentially misleading errors
5435 continue;
5436 }
5437 boolean isTypeVar = false;
5438 if (subType.getTag() == TYPEVAR) {
5439 isTypeVar = true; //error recovery
5440 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5441 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5442 }
5443 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5444 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5445 }
5446 if (permittedTypes.contains(subType.tsym)) {
5447 DiagnosticPosition pos =
5448 env.enclClass.permitting.stream()
5449 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5450 .limit(2).collect(List.collector()).get(1);
5451 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5452 } else {
5453 permittedTypes.add(subType.tsym);
5454 }
5455 if (sealedInUnnamed) {
5456 if (subType.tsym.packge() != c.packge()) {
5457 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5458 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5459 );
5460 }
5461 } else if (subType.tsym.packge().modle != c.packge().modle) {
5462 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5463 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5464 );
5465 }
5466 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5467 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5468 Errors.InvalidPermitsClause(
5469 subType.tsym == c.type.tsym ?
5470 Fragments.MustNotBeSameClass :
5471 Fragments.MustNotBeSupertype(subType)
5472 )
5473 );
5474 } else if (!isTypeVar) {
5475 boolean thisIsASuper = types.directSupertypes(subType)
5476 .stream()
5477 .anyMatch(d -> d.tsym == c);
5478 if (!thisIsASuper) {
5479 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5480 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5481 }
5482 }
5483 }
5484 }
5485
5486 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5487 .stream()
5488 .filter(s -> s.tsym.isSealed())
5489 .map(s -> (ClassSymbol) s.tsym)
5490 .collect(List.collector());
5491
5492 if (sealedSupers.isEmpty()) {
5493 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5494 boolean hasErrorSuper = false;
5495
5496 hasErrorSuper |= types.directSupertypes(c.type)
5497 .stream()
5498 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5499
5500 ClassType ct = (ClassType) c.type;
5501
5502 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5503
5504 if (!hasErrorSuper) {
5505 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5506 }
5507 }
5508 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5509 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5510 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5511 }
5512
5513 if (!c.type.isCompound()) {
5514 for (ClassSymbol supertypeSym : sealedSupers) {
5515 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5516 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5517 }
5518 }
5519 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5520 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5521 c.isInterface() ?
5522 Errors.NonSealedOrSealedExpected :
5523 Errors.NonSealedSealedOrFinalExpected);
5524 }
5525 }
5526 }
5527
5528 deferredLintHandler.flush(env.tree, env.info.lint);
5529 env.info.returnResult = null;
5530 // java.lang.Enum may not be subclassed by a non-enum
5531 if (st.tsym == syms.enumSym &&
5532 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5533 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5534
5535 // Enums may not be extended by source-level classes
5536 if (st.tsym != null &&
5537 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5538 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5539 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5540 }
5541
5542 if (rs.isSerializable(c.type)) {
5543 env.info.isSerializable = true;
5544 }
5545
5546 if (c.isValueClass()) {
5547 Assert.check(env.tree.hasTag(CLASSDEF));
5548 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5549 }
5550
5551 attribClassBody(env, c);
5552
5553 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5554 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5555 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5556 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5557
5558 if (c.isImplicit()) {
5559 chk.checkHasMain(env.tree.pos(), c);
5560 }
5561 } finally {
5562 env.info.returnResult = prevReturnRes;
5563 log.useSource(prev);
5564 chk.setLint(prevLint);
5565 }
5566
5567 }
5568 }
5569
5570 public void visitImport(JCImport tree) {
5571 // nothing to do
5572 }
5573
5574 public void visitModuleDef(JCModuleDecl tree) {
5575 tree.sym.completeUsesProvides();
5576 ModuleSymbol msym = tree.sym;
5577 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5578 Lint prevLint = chk.setLint(lint);
5579 chk.checkModuleName(tree);
5580 chk.checkDeprecatedAnnotation(tree, msym);
5581
5582 try {
5583 deferredLintHandler.flush(tree, lint);
5584 } finally {
5585 chk.setLint(prevLint);
5586 }
5587 }
5588
5589 /** Finish the attribution of a class. */
5590 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5591 JCClassDecl tree = (JCClassDecl)env.tree;
5592 Assert.check(c == tree.sym);
5593
5594 // Validate type parameters, supertype and interfaces.
5595 attribStats(tree.typarams, env);
5596 if (!c.isAnonymous()) {
5597 //already checked if anonymous
5598 chk.validate(tree.typarams, env);
5599 chk.validate(tree.extending, env);
5600 chk.validate(tree.implementing, env);
5601 }
5602
5603 c.markAbstractIfNeeded(types);
5604
5605 // If this is a non-abstract class, check that it has no abstract
5606 // methods or unimplemented methods of an implemented interface.
5607 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5608 chk.checkAllDefined(tree.pos(), c);
5609 }
5610
5611 if ((c.flags() & ANNOTATION) != 0) {
5612 if (tree.implementing.nonEmpty())
5613 log.error(tree.implementing.head.pos(),
5614 Errors.CantExtendIntfAnnotation);
5615 if (tree.typarams.nonEmpty()) {
5616 log.error(tree.typarams.head.pos(),
5617 Errors.IntfAnnotationCantHaveTypeParams(c));
5618 }
5619
5620 // If this annotation type has a @Repeatable, validate
5621 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5622 // If this annotation type has a @Repeatable, validate
5623 if (repeatable != null) {
5624 // get diagnostic position for error reporting
5625 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5626 Assert.checkNonNull(cbPos);
5627
5628 chk.validateRepeatable(c, repeatable, cbPos);
5629 }
5630 } else {
5631 // Check that all extended classes and interfaces
5632 // are compatible (i.e. no two define methods with same arguments
5633 // yet different return types). (JLS 8.4.8.3)
5634 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5635 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5636 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5637 }
5638
5639 // Check that class does not import the same parameterized interface
5640 // with two different argument lists.
5641 chk.checkClassBounds(tree.pos(), c.type);
5642
5643 tree.type = c.type;
5644
5645 for (List<JCTypeParameter> l = tree.typarams;
5646 l.nonEmpty(); l = l.tail) {
5647 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5648 }
5649
5650 // Check that a generic class doesn't extend Throwable
5651 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5652 log.error(tree.extending.pos(), Errors.GenericThrowable);
5653
5654 // Check that all methods which implement some
5655 // method conform to the method they implement.
5656 chk.checkImplementations(tree);
5657
5658 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5659 checkAutoCloseable(tree.pos(), env, c.type);
5660
5661 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5662 // Attribute declaration
5663 attribStat(l.head, env);
5664 // Check that declarations in inner classes are not static (JLS 8.1.2)
5665 // Make an exception for static constants.
5666 if (!allowRecords &&
5667 c.owner.kind != PCK &&
5668 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5669 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5670 VarSymbol sym = null;
5671 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5672 if (sym == null ||
5673 sym.kind != VAR ||
5674 sym.getConstValue() == null)
5675 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5676 }
5677 }
5678
5679 // Check for proper placement of super()/this() calls.
5680 chk.checkSuperInitCalls(tree);
5681
5682 // Check for cycles among non-initial constructors.
5683 chk.checkCyclicConstructors(tree);
5684
5685 // Check for cycles among annotation elements.
5686 chk.checkNonCyclicElements(tree);
5687
5688 // Check for proper use of serialVersionUID and other
5689 // serialization-related fields and methods
5690 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5691 && rs.isSerializable(c.type)
5692 && !c.isAnonymous()) {
5693 chk.checkSerialStructure(env, tree, c);
5694 }
5695 // Correctly organize the positions of the type annotations
5696 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5697
5698 // Check type annotations applicability rules
5699 validateTypeAnnotations(tree, false);
5700 }
5701 // where
5702 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5703 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5704 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5705 if (types.isSameType(al.head.annotationType.type, t))
5706 return al.head.pos();
5707 }
5708
5709 return null;
5710 }
5711
5712 private Type capture(Type type) {
5713 return types.capture(type);
5714 }
5715
5716 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5717 if (type.isErroneous()) {
5718 tree.vartype = make.at(Position.NOPOS).Erroneous();
5719 } else {
5720 tree.vartype = make.at(Position.NOPOS).Type(type);
5721 }
5722 }
5723
5724 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5725 tree.accept(new TypeAnnotationsValidator(sigOnly));
5726 }
5727 //where
5728 private final class TypeAnnotationsValidator extends TreeScanner {
5729
5730 private final boolean sigOnly;
5731 public TypeAnnotationsValidator(boolean sigOnly) {
5732 this.sigOnly = sigOnly;
5733 }
5734
5735 public void visitAnnotation(JCAnnotation tree) {
5736 chk.validateTypeAnnotation(tree, null, false);
5737 super.visitAnnotation(tree);
5738 }
5739 public void visitAnnotatedType(JCAnnotatedType tree) {
5740 if (!tree.underlyingType.type.isErroneous()) {
5741 super.visitAnnotatedType(tree);
5742 }
5743 }
5744 public void visitTypeParameter(JCTypeParameter tree) {
5745 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5746 scan(tree.bounds);
5747 // Don't call super.
5748 // This is needed because above we call validateTypeAnnotation with
5749 // false, which would forbid annotations on type parameters.
5750 // super.visitTypeParameter(tree);
5751 }
5752 public void visitMethodDef(JCMethodDecl tree) {
5753 if (tree.recvparam != null &&
5754 !tree.recvparam.vartype.type.isErroneous()) {
5755 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5756 }
5757 if (tree.restype != null && tree.restype.type != null) {
5758 validateAnnotatedType(tree.restype, tree.restype.type);
5759 }
5760 if (sigOnly) {
5761 scan(tree.mods);
5762 scan(tree.restype);
5763 scan(tree.typarams);
5764 scan(tree.recvparam);
5765 scan(tree.params);
5766 scan(tree.thrown);
5767 } else {
5768 scan(tree.defaultValue);
5769 scan(tree.body);
5770 }
5771 }
5772 public void visitVarDef(final JCVariableDecl tree) {
5773 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5774 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5775 validateAnnotatedType(tree.vartype, tree.sym.type);
5776 scan(tree.mods);
5777 scan(tree.vartype);
5778 if (!sigOnly) {
5779 scan(tree.init);
5780 }
5781 }
5782 public void visitTypeCast(JCTypeCast tree) {
5783 if (tree.clazz != null && tree.clazz.type != null)
5784 validateAnnotatedType(tree.clazz, tree.clazz.type);
5785 super.visitTypeCast(tree);
5786 }
5787 public void visitTypeTest(JCInstanceOf tree) {
5788 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5789 validateAnnotatedType(tree.pattern, tree.pattern.type);
5790 super.visitTypeTest(tree);
5791 }
5792 public void visitNewClass(JCNewClass tree) {
5793 if (tree.clazz != null && tree.clazz.type != null) {
5794 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5795 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5796 tree.clazz.type.tsym);
5797 }
5798 if (tree.def != null) {
5799 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5800 }
5801
5802 validateAnnotatedType(tree.clazz, tree.clazz.type);
5803 }
5804 super.visitNewClass(tree);
5805 }
5806 public void visitNewArray(JCNewArray tree) {
5807 if (tree.elemtype != null && tree.elemtype.type != null) {
5808 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5809 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5810 tree.elemtype.type.tsym);
5811 }
5812 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5813 }
5814 super.visitNewArray(tree);
5815 }
5816 public void visitClassDef(JCClassDecl tree) {
5817 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5818 if (sigOnly) {
5819 scan(tree.mods);
5820 scan(tree.typarams);
5821 scan(tree.extending);
5822 scan(tree.implementing);
5823 }
5824 for (JCTree member : tree.defs) {
5825 if (member.hasTag(Tag.CLASSDEF)) {
5826 continue;
5827 }
5828 scan(member);
5829 }
5830 }
5831 public void visitBlock(JCBlock tree) {
5832 if (!sigOnly) {
5833 scan(tree.stats);
5834 }
5835 }
5836
5837 /* I would want to model this after
5838 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5839 * and override visitSelect and visitTypeApply.
5840 * However, we only set the annotated type in the top-level type
5841 * of the symbol.
5842 * Therefore, we need to override each individual location where a type
5843 * can occur.
5844 */
5845 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5846 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5847
5848 if (type.isPrimitiveOrVoid()) {
5849 return;
5850 }
5851
5852 JCTree enclTr = errtree;
5853 Type enclTy = type;
5854
5855 boolean repeat = true;
5856 while (repeat) {
5857 if (enclTr.hasTag(TYPEAPPLY)) {
5858 List<Type> tyargs = enclTy.getTypeArguments();
5859 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5860 if (trargs.length() > 0) {
5861 // Nothing to do for diamonds
5862 if (tyargs.length() == trargs.length()) {
5863 for (int i = 0; i < tyargs.length(); ++i) {
5864 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5865 }
5866 }
5867 // If the lengths don't match, it's either a diamond
5868 // or some nested type that redundantly provides
5869 // type arguments in the tree.
5870 }
5871
5872 // Look at the clazz part of a generic type
5873 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5874 }
5875
5876 if (enclTr.hasTag(SELECT)) {
5877 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5878 if (enclTy != null &&
5879 !enclTy.hasTag(NONE)) {
5880 enclTy = enclTy.getEnclosingType();
5881 }
5882 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5883 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5884 if (enclTy == null || enclTy.hasTag(NONE)) {
5885 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5886 for (JCAnnotation an : at.getAnnotations()) {
5887 if (chk.isTypeAnnotation(an, false)) {
5888 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5889 }
5890 }
5891 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5892 if (!onlyTypeAnnotations.isEmpty()) {
5893 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5894 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5895 Fragments.TypeAnnotation(onlyTypeAnnotations);
5896 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5897 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5898 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5899 type.tsym.owner, annotatedType));
5900 }
5901 repeat = false;
5902 }
5903 enclTr = at.underlyingType;
5904 // enclTy doesn't need to be changed
5905 } else if (enclTr.hasTag(IDENT)) {
5906 repeat = false;
5907 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5908 JCWildcard wc = (JCWildcard) enclTr;
5909 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5910 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5911 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5912 } else {
5913 // Nothing to do for UNBOUND
5914 }
5915 repeat = false;
5916 } else if (enclTr.hasTag(TYPEARRAY)) {
5917 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5918 validateAnnotatedType(art.getType(), art.elemtype.type);
5919 repeat = false;
5920 } else if (enclTr.hasTag(TYPEUNION)) {
5921 JCTypeUnion ut = (JCTypeUnion) enclTr;
5922 for (JCTree t : ut.getTypeAlternatives()) {
5923 validateAnnotatedType(t, t.type);
5924 }
5925 repeat = false;
5926 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5927 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5928 for (JCTree t : it.getBounds()) {
5929 validateAnnotatedType(t, t.type);
5930 }
5931 repeat = false;
5932 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5933 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5934 repeat = false;
5935 } else {
5936 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5937 " within: "+ errtree + " with kind: " + errtree.getKind());
5938 }
5939 }
5940 }
5941
5942 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5943 Symbol sym) {
5944 // Ensure that no declaration annotations are present.
5945 // Note that a tree type might be an AnnotatedType with
5946 // empty annotations, if only declaration annotations were given.
5947 // This method will raise an error for such a type.
5948 for (JCAnnotation ai : annotations) {
5949 if (!ai.type.isErroneous() &&
5950 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5951 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5952 }
5953 }
5954 }
5955 }
5956
5957 // <editor-fold desc="post-attribution visitor">
5958
5959 /**
5960 * Handle missing types/symbols in an AST. This routine is useful when
5961 * the compiler has encountered some errors (which might have ended up
5962 * terminating attribution abruptly); if the compiler is used in fail-over
5963 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5964 * prevents NPE to be propagated during subsequent compilation steps.
5965 */
5966 public void postAttr(JCTree tree) {
5967 new PostAttrAnalyzer().scan(tree);
5968 }
5969
5970 class PostAttrAnalyzer extends TreeScanner {
5971
5972 private void initTypeIfNeeded(JCTree that) {
5973 if (that.type == null) {
5974 if (that.hasTag(METHODDEF)) {
5975 that.type = dummyMethodType((JCMethodDecl)that);
5976 } else {
5977 that.type = syms.unknownType;
5978 }
5979 }
5980 }
5981
5982 /* Construct a dummy method type. If we have a method declaration,
5983 * and the declared return type is void, then use that return type
5984 * instead of UNKNOWN to avoid spurious error messages in lambda
5985 * bodies (see:JDK-8041704).
5986 */
5987 private Type dummyMethodType(JCMethodDecl md) {
5988 Type restype = syms.unknownType;
5989 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5990 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5991 if (prim.typetag == VOID)
5992 restype = syms.voidType;
5993 }
5994 return new MethodType(List.nil(), restype,
5995 List.nil(), syms.methodClass);
5996 }
5997 private Type dummyMethodType() {
5998 return dummyMethodType(null);
5999 }
6000
6001 @Override
6002 public void scan(JCTree tree) {
6003 if (tree == null) return;
6004 if (tree instanceof JCExpression) {
6005 initTypeIfNeeded(tree);
6006 }
6007 super.scan(tree);
6008 }
6009
6010 @Override
6011 public void visitIdent(JCIdent that) {
6012 if (that.sym == null) {
6013 that.sym = syms.unknownSymbol;
6014 }
6015 }
6016
6017 @Override
6018 public void visitSelect(JCFieldAccess that) {
6019 if (that.sym == null) {
6020 that.sym = syms.unknownSymbol;
6021 }
6022 super.visitSelect(that);
6023 }
6024
6025 @Override
6026 public void visitClassDef(JCClassDecl that) {
6027 initTypeIfNeeded(that);
6028 if (that.sym == null) {
6029 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6030 }
6031 super.visitClassDef(that);
6032 }
6033
6034 @Override
6035 public void visitMethodDef(JCMethodDecl that) {
6036 initTypeIfNeeded(that);
6037 if (that.sym == null) {
6038 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6039 }
6040 super.visitMethodDef(that);
6041 }
6042
6043 @Override
6044 public void visitVarDef(JCVariableDecl that) {
6045 initTypeIfNeeded(that);
6046 if (that.sym == null) {
6047 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6048 that.sym.adr = 0;
6049 }
6050 if (that.vartype == null) {
6051 that.vartype = make.at(Position.NOPOS).Erroneous();
6052 }
6053 super.visitVarDef(that);
6054 }
6055
6056 @Override
6057 public void visitBindingPattern(JCBindingPattern that) {
6058 initTypeIfNeeded(that);
6059 initTypeIfNeeded(that.var);
6060 if (that.var.sym == null) {
6061 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6062 that.var.sym.adr = 0;
6063 }
6064 super.visitBindingPattern(that);
6065 }
6066
6067 @Override
6068 public void visitRecordPattern(JCRecordPattern that) {
6069 initTypeIfNeeded(that);
6070 if (that.record == null) {
6071 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6072 that.type, syms.noSymbol);
6073 }
6074 if (that.fullComponentTypes == null) {
6075 that.fullComponentTypes = List.nil();
6076 }
6077 super.visitRecordPattern(that);
6078 }
6079
6080 @Override
6081 public void visitNewClass(JCNewClass that) {
6082 if (that.constructor == null) {
6083 that.constructor = new MethodSymbol(0, names.init,
6084 dummyMethodType(), syms.noSymbol);
6085 }
6086 if (that.constructorType == null) {
6087 that.constructorType = syms.unknownType;
6088 }
6089 super.visitNewClass(that);
6090 }
6091
6092 @Override
6093 public void visitAssignop(JCAssignOp that) {
6094 if (that.operator == null) {
6095 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6096 -1, syms.noSymbol);
6097 }
6098 super.visitAssignop(that);
6099 }
6100
6101 @Override
6102 public void visitBinary(JCBinary that) {
6103 if (that.operator == null) {
6104 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6105 -1, syms.noSymbol);
6106 }
6107 super.visitBinary(that);
6108 }
6109
6110 @Override
6111 public void visitUnary(JCUnary that) {
6112 if (that.operator == null) {
6113 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6114 -1, syms.noSymbol);
6115 }
6116 super.visitUnary(that);
6117 }
6118
6119 @Override
6120 public void visitReference(JCMemberReference that) {
6121 super.visitReference(that);
6122 if (that.sym == null) {
6123 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6124 syms.noSymbol);
6125 }
6126 }
6127 }
6128 // </editor-fold>
6129
6130 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6131 new TreeScanner() {
6132 Symbol packge = pkg;
6133 @Override
6134 public void visitIdent(JCIdent that) {
6135 that.sym = packge;
6136 }
6137
6138 @Override
6139 public void visitSelect(JCFieldAccess that) {
6140 that.sym = packge;
6141 packge = packge.owner;
6142 super.visitSelect(that);
6143 }
6144 }.scan(pid);
6145 }
6146
6147 }