1 /*
2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
50 import com.sun.tools.javac.comp.Check.CheckContext;
51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
52 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
53 import com.sun.tools.javac.jvm.*;
54
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
58
59 import com.sun.tools.javac.resources.CompilerProperties.Errors;
60 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
61 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
62 import com.sun.tools.javac.tree.*;
63 import com.sun.tools.javac.tree.JCTree.*;
64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
65 import com.sun.tools.javac.util.*;
66 import com.sun.tools.javac.util.DefinedBy.Api;
67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
68 import com.sun.tools.javac.util.JCDiagnostic.Error;
69 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
70 import com.sun.tools.javac.util.JCDiagnostic.Warning;
71 import com.sun.tools.javac.util.List;
72
73 import static com.sun.tools.javac.code.Flags.*;
74 import static com.sun.tools.javac.code.Flags.ANNOTATION;
75 import static com.sun.tools.javac.code.Flags.BLOCK;
76 import static com.sun.tools.javac.code.Kinds.*;
77 import static com.sun.tools.javac.code.Kinds.Kind.*;
78 import static com.sun.tools.javac.code.TypeTag.*;
79 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
80 import static com.sun.tools.javac.tree.JCTree.Tag.*;
81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
82
83 /** This is the main context-dependent analysis phase in GJC. It
84 * encompasses name resolution, type checking and constant folding as
85 * subtasks. Some subtasks involve auxiliary classes.
86 * @see Check
87 * @see Resolve
88 * @see ConstFold
89 * @see Infer
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public class Attr extends JCTree.Visitor {
97 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
98
99 final Names names;
100 final Log log;
101 final Symtab syms;
102 final Resolve rs;
103 final Operators operators;
104 final Infer infer;
105 final Analyzer analyzer;
106 final DeferredAttr deferredAttr;
107 final Check chk;
108 final Flow flow;
109 final MemberEnter memberEnter;
110 final TypeEnter typeEnter;
111 final TreeMaker make;
112 final ConstFold cfolder;
113 final Enter enter;
114 final Target target;
115 final Types types;
116 final Preview preview;
117 final JCDiagnostic.Factory diags;
118 final TypeAnnotations typeAnnotations;
119 final DeferredLintHandler deferredLintHandler;
120 final TypeEnvs typeEnvs;
121 final Dependencies dependencies;
122 final Annotate annotate;
123 final ArgumentAttr argumentAttr;
124 final MatchBindingsComputer matchBindingsComputer;
125 final AttrRecover attrRecover;
126
127 public static Attr instance(Context context) {
128 Attr instance = context.get(attrKey);
129 if (instance == null)
130 instance = new Attr(context);
131 return instance;
132 }
133
134 @SuppressWarnings("this-escape")
135 protected Attr(Context context) {
136 context.put(attrKey, this);
137
138 names = Names.instance(context);
139 log = Log.instance(context);
140 syms = Symtab.instance(context);
141 rs = Resolve.instance(context);
142 operators = Operators.instance(context);
143 chk = Check.instance(context);
144 flow = Flow.instance(context);
145 memberEnter = MemberEnter.instance(context);
146 typeEnter = TypeEnter.instance(context);
147 make = TreeMaker.instance(context);
148 enter = Enter.instance(context);
149 infer = Infer.instance(context);
150 analyzer = Analyzer.instance(context);
151 deferredAttr = DeferredAttr.instance(context);
152 cfolder = ConstFold.instance(context);
153 target = Target.instance(context);
154 types = Types.instance(context);
155 preview = Preview.instance(context);
156 diags = JCDiagnostic.Factory.instance(context);
157 annotate = Annotate.instance(context);
158 typeAnnotations = TypeAnnotations.instance(context);
159 deferredLintHandler = DeferredLintHandler.instance(context);
160 typeEnvs = TypeEnvs.instance(context);
161 dependencies = Dependencies.instance(context);
162 argumentAttr = ArgumentAttr.instance(context);
163 matchBindingsComputer = MatchBindingsComputer.instance(context);
164 attrRecover = AttrRecover.instance(context);
165
166 Options options = Options.instance(context);
167
168 Source source = Source.instance(context);
169 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
170 allowRecords = Feature.RECORDS.allowedInSource(source);
171 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
172 Feature.PATTERN_SWITCH.allowedInSource(source);
173 allowUnconditionalPatternsInstanceOf =
174 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
175 sourceName = source.name;
176 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
177
178 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
179 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
180 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
181 methodAttrInfo = new MethodAttrInfo();
182 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
183 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
184 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
185 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
186 }
187
188 /** Switch: reifiable types in instanceof enabled?
189 */
190 boolean allowReifiableTypesInInstanceof;
191
192 /** Are records allowed
193 */
194 private final boolean allowRecords;
195
196 /** Are patterns in switch allowed
197 */
198 private final boolean allowPatternSwitch;
199
200 /** Are unconditional patterns in instanceof allowed
201 */
202 private final boolean allowUnconditionalPatternsInstanceOf;
203
204 /**
205 * Switch: warn about use of variable before declaration?
206 * RFE: 6425594
207 */
208 boolean useBeforeDeclarationWarning;
209
210 /**
211 * Switch: name of source level; used for error reporting.
212 */
213 String sourceName;
214
215 /** Check kind and type of given tree against protokind and prototype.
216 * If check succeeds, store type in tree and return it.
217 * If check fails, store errType in tree and return it.
218 * No checks are performed if the prototype is a method type.
219 * It is not necessary in this case since we know that kind and type
220 * are correct.
221 *
222 * @param tree The tree whose kind and type is checked
223 * @param found The computed type of the tree
224 * @param ownkind The computed kind of the tree
225 * @param resultInfo The expected result of the tree
226 */
227 Type check(final JCTree tree,
228 final Type found,
229 final KindSelector ownkind,
230 final ResultInfo resultInfo) {
231 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
232 Type owntype;
233 boolean shouldCheck = !found.hasTag(ERROR) &&
234 !resultInfo.pt.hasTag(METHOD) &&
235 !resultInfo.pt.hasTag(FORALL);
236 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
237 log.error(tree.pos(),
238 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
239 ownkind.kindNames()));
240 owntype = types.createErrorType(found);
241 } else if (inferenceContext.free(found)) {
242 //delay the check if there are inference variables in the found type
243 //this means we are dealing with a partially inferred poly expression
244 owntype = shouldCheck ? resultInfo.pt : found;
245 if (resultInfo.checkMode.installPostInferenceHook()) {
246 inferenceContext.addFreeTypeListener(List.of(found),
247 instantiatedContext -> {
248 ResultInfo pendingResult =
249 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
250 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
251 });
252 }
253 } else {
254 owntype = shouldCheck ?
255 resultInfo.check(tree, found) :
256 found;
257 }
258 if (resultInfo.checkMode.updateTreeType()) {
259 tree.type = owntype;
260 }
261 return owntype;
262 }
263
264 /** Is given blank final variable assignable, i.e. in a scope where it
265 * may be assigned to even though it is final?
266 * @param v The blank final variable.
267 * @param env The current environment.
268 */
269 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
270 Symbol owner = env.info.scope.owner;
271 // owner refers to the innermost variable, method or
272 // initializer block declaration at this point.
273 boolean isAssignable =
274 v.owner == owner
275 ||
276 ((owner.name == names.init || // i.e. we are in a constructor
277 owner.kind == VAR || // i.e. we are in a variable initializer
278 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
279 &&
280 v.owner == owner.owner
281 &&
282 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
283 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
284 return isAssignable & !insideCompactConstructor;
285 }
286
287 /** Check that variable can be assigned to.
288 * @param pos The current source code position.
289 * @param v The assigned variable
290 * @param base If the variable is referred to in a Select, the part
291 * to the left of the `.', null otherwise.
292 * @param env The current environment.
293 */
294 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
295 if (v.name == names._this) {
296 log.error(pos, Errors.CantAssignValToThis);
297 return;
298 }
299 if ((v.flags() & FINAL) != 0 &&
300 ((v.flags() & HASINIT) != 0
301 ||
302 !((base == null ||
303 TreeInfo.isThisQualifier(base)) &&
304 isAssignableAsBlankFinal(v, env)))) {
305 if (v.isResourceVariable()) { //TWR resource
306 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
307 } else {
308 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
309 }
310 return;
311 }
312
313 // Check instance field assignments that appear in constructor prologues
314 if (rs.isEarlyReference(env, base, v)) {
315
316 // Field may not be inherited from a superclass
317 if (v.owner != env.enclClass.sym) {
318 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
319 return;
320 }
321
322 // Field may not have an initializer
323 if ((v.flags() & HASINIT) != 0) {
324 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
325 return;
326 }
327 }
328
329 if (!env.info.ctorPrologue &&
330 v.owner.isValueClass() &&
331 v.owner.kind == TYP &&
332 v.owner == env.enclClass.sym &&
333 (v.flags() & STATIC) == 0 &&
334 (base == null ||
335 TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, base))) {
336 log.error(pos, Errors.CantRefAfterCtorCalled(v));
337 }
338 }
339
340 /** Does tree represent a static reference to an identifier?
341 * It is assumed that tree is either a SELECT or an IDENT.
342 * We have to weed out selects from non-type names here.
343 * @param tree The candidate tree.
344 */
345 boolean isStaticReference(JCTree tree) {
346 if (tree.hasTag(SELECT)) {
347 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
348 if (lsym == null || lsym.kind != TYP) {
349 return false;
350 }
351 }
352 return true;
353 }
354
355 /** Is this symbol a type?
356 */
357 static boolean isType(Symbol sym) {
358 return sym != null && sym.kind == TYP;
359 }
360
361 /** Attribute a parsed identifier.
362 * @param tree Parsed identifier name
363 * @param topLevel The toplevel to use
364 */
365 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
366 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
367 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
368 syms.errSymbol.name,
369 null, null, null, null);
370 localEnv.enclClass.sym = syms.errSymbol;
371 return attribIdent(tree, localEnv);
372 }
373
374 /** Attribute a parsed identifier.
375 * @param tree Parsed identifier name
376 * @param env The env to use
377 */
378 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
379 return tree.accept(identAttributer, env);
380 }
381 // where
382 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
383 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
384 @Override @DefinedBy(Api.COMPILER_TREE)
385 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
386 Symbol site = visit(node.getExpression(), env);
387 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
388 return site;
389 Name name = (Name)node.getIdentifier();
390 if (site.kind == PCK) {
391 env.toplevel.packge = (PackageSymbol)site;
392 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
393 KindSelector.TYP_PCK);
394 } else {
395 env.enclClass.sym = (ClassSymbol)site;
396 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
397 }
398 }
399
400 @Override @DefinedBy(Api.COMPILER_TREE)
401 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
402 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
403 }
404 }
405
406 public Type coerce(Type etype, Type ttype) {
407 return cfolder.coerce(etype, ttype);
408 }
409
410 public Type attribType(JCTree node, TypeSymbol sym) {
411 Env<AttrContext> env = typeEnvs.get(sym);
412 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
413 return attribTree(node, localEnv, unknownTypeInfo);
414 }
415
416 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
417 // Attribute qualifying package or class.
418 JCFieldAccess s = tree.qualid;
419 return attribTree(s.selected, env,
420 new ResultInfo(tree.staticImport ?
421 KindSelector.TYP : KindSelector.TYP_PCK,
422 Type.noType));
423 }
424
425 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
426 return attribToTree(expr, env, tree, unknownExprInfo);
427 }
428
429 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
430 return attribToTree(stmt, env, tree, statInfo);
431 }
432
433 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
434 breakTree = tree;
435 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
436 try {
437 deferredAttr.attribSpeculative(root, env, resultInfo,
438 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
439 argumentAttr.withLocalCacheContext());
440 attrRecover.doRecovery();
441 } catch (BreakAttr b) {
442 return b.env;
443 } catch (AssertionError ae) {
444 if (ae.getCause() instanceof BreakAttr breakAttr) {
445 return breakAttr.env;
446 } else {
447 throw ae;
448 }
449 } finally {
450 breakTree = null;
451 log.useSource(prev);
452 }
453 return env;
454 }
455
456 private JCTree breakTree = null;
457
458 private static class BreakAttr extends RuntimeException {
459 static final long serialVersionUID = -6924771130405446405L;
460 private transient Env<AttrContext> env;
461 private BreakAttr(Env<AttrContext> env) {
462 this.env = env;
463 }
464 }
465
466 /**
467 * Mode controlling behavior of Attr.Check
468 */
469 enum CheckMode {
470
471 NORMAL,
472
473 /**
474 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
475 * that the captured var cache in {@code InferenceContext} will be used in read-only
476 * mode when performing inference checks.
477 */
478 NO_TREE_UPDATE {
479 @Override
480 public boolean updateTreeType() {
481 return false;
482 }
483 },
484 /**
485 * Mode signalling that caller will manage free types in tree decorations.
486 */
487 NO_INFERENCE_HOOK {
488 @Override
489 public boolean installPostInferenceHook() {
490 return false;
491 }
492 };
493
494 public boolean updateTreeType() {
495 return true;
496 }
497 public boolean installPostInferenceHook() {
498 return true;
499 }
500 }
501
502
503 class ResultInfo {
504 final KindSelector pkind;
505 final Type pt;
506 final CheckContext checkContext;
507 final CheckMode checkMode;
508
509 ResultInfo(KindSelector pkind, Type pt) {
510 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
511 }
512
513 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
514 this(pkind, pt, chk.basicHandler, checkMode);
515 }
516
517 protected ResultInfo(KindSelector pkind,
518 Type pt, CheckContext checkContext) {
519 this(pkind, pt, checkContext, CheckMode.NORMAL);
520 }
521
522 protected ResultInfo(KindSelector pkind,
523 Type pt, CheckContext checkContext, CheckMode checkMode) {
524 this.pkind = pkind;
525 this.pt = pt;
526 this.checkContext = checkContext;
527 this.checkMode = checkMode;
528 }
529
530 /**
531 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
532 * @param tree The tree to be type-checked.
533 * @return true if {@code ArgumentAttr} should be used.
534 */
535 protected boolean needsArgumentAttr(JCTree tree) { return false; }
536
537 protected Type check(final DiagnosticPosition pos, final Type found) {
538 return chk.checkType(pos, found, pt, checkContext);
539 }
540
541 protected ResultInfo dup(Type newPt) {
542 return new ResultInfo(pkind, newPt, checkContext, checkMode);
543 }
544
545 protected ResultInfo dup(CheckContext newContext) {
546 return new ResultInfo(pkind, pt, newContext, checkMode);
547 }
548
549 protected ResultInfo dup(Type newPt, CheckContext newContext) {
550 return new ResultInfo(pkind, newPt, newContext, checkMode);
551 }
552
553 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
554 return new ResultInfo(pkind, newPt, newContext, newMode);
555 }
556
557 protected ResultInfo dup(CheckMode newMode) {
558 return new ResultInfo(pkind, pt, checkContext, newMode);
559 }
560
561 @Override
562 public String toString() {
563 if (pt != null) {
564 return pt.toString();
565 } else {
566 return "";
567 }
568 }
569 }
570
571 class MethodAttrInfo extends ResultInfo {
572 public MethodAttrInfo() {
573 this(chk.basicHandler);
574 }
575
576 public MethodAttrInfo(CheckContext checkContext) {
577 super(KindSelector.VAL, Infer.anyPoly, checkContext);
578 }
579
580 @Override
581 protected boolean needsArgumentAttr(JCTree tree) {
582 return true;
583 }
584
585 protected ResultInfo dup(Type newPt) {
586 throw new IllegalStateException();
587 }
588
589 protected ResultInfo dup(CheckContext newContext) {
590 return new MethodAttrInfo(newContext);
591 }
592
593 protected ResultInfo dup(Type newPt, CheckContext newContext) {
594 throw new IllegalStateException();
595 }
596
597 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
598 throw new IllegalStateException();
599 }
600
601 protected ResultInfo dup(CheckMode newMode) {
602 throw new IllegalStateException();
603 }
604 }
605
606 class RecoveryInfo extends ResultInfo {
607
608 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
609 this(deferredAttrContext, Type.recoveryType);
610 }
611
612 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
613 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
614 @Override
615 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
616 return deferredAttrContext;
617 }
618 @Override
619 public boolean compatible(Type found, Type req, Warner warn) {
620 return true;
621 }
622 @Override
623 public void report(DiagnosticPosition pos, JCDiagnostic details) {
624 boolean needsReport = pt == Type.recoveryType ||
625 (details.getDiagnosticPosition() != null &&
626 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
627 if (needsReport) {
628 chk.basicHandler.report(pos, details);
629 }
630 }
631 });
632 }
633 }
634
635 final ResultInfo statInfo;
636 final ResultInfo varAssignmentInfo;
637 final ResultInfo methodAttrInfo;
638 final ResultInfo unknownExprInfo;
639 final ResultInfo unknownTypeInfo;
640 final ResultInfo unknownTypeExprInfo;
641 final ResultInfo recoveryInfo;
642 final MethodType initBlockType;
643
644 Type pt() {
645 return resultInfo.pt;
646 }
647
648 KindSelector pkind() {
649 return resultInfo.pkind;
650 }
651
652 /* ************************************************************************
653 * Visitor methods
654 *************************************************************************/
655
656 /** Visitor argument: the current environment.
657 */
658 Env<AttrContext> env;
659
660 /** Visitor argument: the currently expected attribution result.
661 */
662 ResultInfo resultInfo;
663
664 /** Visitor result: the computed type.
665 */
666 Type result;
667
668 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
669
670 /** Visitor method: attribute a tree, catching any completion failure
671 * exceptions. Return the tree's type.
672 *
673 * @param tree The tree to be visited.
674 * @param env The environment visitor argument.
675 * @param resultInfo The result info visitor argument.
676 */
677 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
678 Env<AttrContext> prevEnv = this.env;
679 ResultInfo prevResult = this.resultInfo;
680 try {
681 this.env = env;
682 this.resultInfo = resultInfo;
683 if (resultInfo.needsArgumentAttr(tree)) {
684 result = argumentAttr.attribArg(tree, env);
685 } else {
686 tree.accept(this);
687 }
688 matchBindings = matchBindingsComputer.finishBindings(tree,
689 matchBindings);
690 if (tree == breakTree &&
691 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
692 breakTreeFound(copyEnv(env));
693 }
694 return result;
695 } catch (CompletionFailure ex) {
696 tree.type = syms.errType;
697 return chk.completionError(tree.pos(), ex);
698 } finally {
699 this.env = prevEnv;
700 this.resultInfo = prevResult;
701 }
702 }
703
704 protected void breakTreeFound(Env<AttrContext> env) {
705 throw new BreakAttr(env);
706 }
707
708 Env<AttrContext> copyEnv(Env<AttrContext> env) {
709 Env<AttrContext> newEnv =
710 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
711 if (newEnv.outer != null) {
712 newEnv.outer = copyEnv(newEnv.outer);
713 }
714 return newEnv;
715 }
716
717 WriteableScope copyScope(WriteableScope sc) {
718 WriteableScope newScope = WriteableScope.create(sc.owner);
719 List<Symbol> elemsList = List.nil();
720 for (Symbol sym : sc.getSymbols()) {
721 elemsList = elemsList.prepend(sym);
722 }
723 for (Symbol s : elemsList) {
724 newScope.enter(s);
725 }
726 return newScope;
727 }
728
729 /** Derived visitor method: attribute an expression tree.
730 */
731 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
732 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
733 }
734
735 /** Derived visitor method: attribute an expression tree with
736 * no constraints on the computed type.
737 */
738 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
739 return attribTree(tree, env, unknownExprInfo);
740 }
741
742 /** Derived visitor method: attribute a type tree.
743 */
744 public Type attribType(JCTree tree, Env<AttrContext> env) {
745 Type result = attribType(tree, env, Type.noType);
746 return result;
747 }
748
749 /** Derived visitor method: attribute a type tree.
750 */
751 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
752 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
753 return result;
754 }
755
756 /** Derived visitor method: attribute a statement or definition tree.
757 */
758 public Type attribStat(JCTree tree, Env<AttrContext> env) {
759 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
760 Type result = attribTree(tree, env, statInfo);
761 analyzer.analyzeIfNeeded(tree, analyzeEnv);
762 attrRecover.doRecovery();
763 return result;
764 }
765
766 /** Attribute a list of expressions, returning a list of types.
767 */
768 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
769 ListBuffer<Type> ts = new ListBuffer<>();
770 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
771 ts.append(attribExpr(l.head, env, pt));
772 return ts.toList();
773 }
774
775 /** Attribute a list of statements, returning nothing.
776 */
777 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
778 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
779 attribStat(l.head, env);
780 }
781
782 /** Attribute the arguments in a method call, returning the method kind.
783 */
784 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
785 KindSelector kind = initialKind;
786 for (JCExpression arg : trees) {
787 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
788 if (argtype.hasTag(DEFERRED)) {
789 kind = KindSelector.of(KindSelector.POLY, kind);
790 }
791 argtypes.append(argtype);
792 }
793 return kind;
794 }
795
796 /** Attribute a type argument list, returning a list of types.
797 * Caller is responsible for calling checkRefTypes.
798 */
799 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
800 ListBuffer<Type> argtypes = new ListBuffer<>();
801 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
802 argtypes.append(attribType(l.head, env));
803 return argtypes.toList();
804 }
805
806 /** Attribute a type argument list, returning a list of types.
807 * Check that all the types are references.
808 */
809 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
810 List<Type> types = attribAnyTypes(trees, env);
811 return chk.checkRefTypes(trees, types);
812 }
813
814 /**
815 * Attribute type variables (of generic classes or methods).
816 * Compound types are attributed later in attribBounds.
817 * @param typarams the type variables to enter
818 * @param env the current environment
819 */
820 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
821 for (JCTypeParameter tvar : typarams) {
822 TypeVar a = (TypeVar)tvar.type;
823 a.tsym.flags_field |= UNATTRIBUTED;
824 a.setUpperBound(Type.noType);
825 if (!tvar.bounds.isEmpty()) {
826 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
827 for (JCExpression bound : tvar.bounds.tail)
828 bounds = bounds.prepend(attribType(bound, env));
829 types.setBounds(a, bounds.reverse());
830 } else {
831 // if no bounds are given, assume a single bound of
832 // java.lang.Object.
833 types.setBounds(a, List.of(syms.objectType));
834 }
835 a.tsym.flags_field &= ~UNATTRIBUTED;
836 }
837 if (checkCyclic) {
838 for (JCTypeParameter tvar : typarams) {
839 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
840 }
841 }
842 }
843
844 /**
845 * Attribute the type references in a list of annotations.
846 */
847 void attribAnnotationTypes(List<JCAnnotation> annotations,
848 Env<AttrContext> env) {
849 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
850 JCAnnotation a = al.head;
851 attribType(a.annotationType, env);
852 }
853 }
854
855 /**
856 * Attribute a "lazy constant value".
857 * @param env The env for the const value
858 * @param variable The initializer for the const value
859 * @param type The expected type, or null
860 * @see VarSymbol#setLazyConstValue
861 */
862 public Object attribLazyConstantValue(Env<AttrContext> env,
863 JCVariableDecl variable,
864 Type type) {
865
866 DiagnosticPosition prevLintPos
867 = deferredLintHandler.setPos(variable.pos());
868
869 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
870 try {
871 Type itype = attribExpr(variable.init, env, type);
872 if (variable.isImplicitlyTyped()) {
873 //fixup local variable type
874 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
875 }
876 if (itype.constValue() != null) {
877 return coerce(itype, type).constValue();
878 } else {
879 return null;
880 }
881 } finally {
882 log.useSource(prevSource);
883 deferredLintHandler.setPos(prevLintPos);
884 }
885 }
886
887 /** Attribute type reference in an `extends' or `implements' clause.
888 * Supertypes of anonymous inner classes are usually already attributed.
889 *
890 * @param tree The tree making up the type reference.
891 * @param env The environment current at the reference.
892 * @param classExpected true if only a class is expected here.
893 * @param interfaceExpected true if only an interface is expected here.
894 */
895 Type attribBase(JCTree tree,
896 Env<AttrContext> env,
897 boolean classExpected,
898 boolean interfaceExpected,
899 boolean checkExtensible) {
900 Type t = tree.type != null ?
901 tree.type :
902 attribType(tree, env);
903 try {
904 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
905 } catch (CompletionFailure ex) {
906 chk.completionError(tree.pos(), ex);
907 return t;
908 }
909 }
910 Type checkBase(Type t,
911 JCTree tree,
912 Env<AttrContext> env,
913 boolean classExpected,
914 boolean interfaceExpected,
915 boolean checkExtensible) {
916 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
917 (((JCTypeApply) tree).clazz).pos() : tree.pos();
918 if (t.tsym.isAnonymous()) {
919 log.error(pos, Errors.CantInheritFromAnon);
920 return types.createErrorType(t);
921 }
922 if (t.isErroneous())
923 return t;
924 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
925 // check that type variable is already visible
926 if (t.getUpperBound() == null) {
927 log.error(pos, Errors.IllegalForwardRef);
928 return types.createErrorType(t);
929 }
930 } else {
931 t = chk.checkClassType(pos, t, checkExtensible);
932 }
933 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
934 log.error(pos, Errors.IntfExpectedHere);
935 // return errType is necessary since otherwise there might
936 // be undetected cycles which cause attribution to loop
937 return types.createErrorType(t);
938 } else if (checkExtensible &&
939 classExpected &&
940 (t.tsym.flags() & INTERFACE) != 0) {
941 log.error(pos, Errors.NoIntfExpectedHere);
942 return types.createErrorType(t);
943 }
944 if (checkExtensible &&
945 ((t.tsym.flags() & FINAL) != 0)) {
946 log.error(pos,
947 Errors.CantInheritFromFinal(t.tsym));
948 }
949 chk.checkNonCyclic(pos, t);
950 return t;
951 }
952
953 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
954 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
955 id.type = env.info.scope.owner.enclClass().type;
956 id.sym = env.info.scope.owner.enclClass();
957 return id.type;
958 }
959
960 public void visitClassDef(JCClassDecl tree) {
961 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
962 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
963 argumentAttr.withLocalCacheContext() : null);
964 boolean ctorProloguePrev = env.info.ctorPrologue;
965 try {
966 // Local and anonymous classes have not been entered yet, so we need to
967 // do it now.
968 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
969 enter.classEnter(tree, env);
970 } else {
971 // If this class declaration is part of a class level annotation,
972 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
973 // order to simplify later steps and allow for sensible error
974 // messages.
975 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
976 enter.classEnter(tree, env);
977 }
978
979 ClassSymbol c = tree.sym;
980 if (c == null) {
981 // exit in case something drastic went wrong during enter.
982 result = null;
983 } else {
984 // make sure class has been completed:
985 c.complete();
986
987 // If a class declaration appears in a constructor prologue,
988 // that means it's either a local class or an anonymous class.
989 // Either way, there is no immediately enclosing instance.
990 if (ctorProloguePrev) {
991 c.flags_field |= NOOUTERTHIS;
992 }
993 attribClass(tree.pos(), c);
994 result = tree.type = c.type;
995 }
996 } finally {
997 localCacheContext.ifPresent(LocalCacheContext::leave);
998 env.info.ctorPrologue = ctorProloguePrev;
999 }
1000 }
1001
1002 public void visitMethodDef(JCMethodDecl tree) {
1003 MethodSymbol m = tree.sym;
1004 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1005
1006 Lint lint = env.info.lint.augment(m);
1007 Lint prevLint = chk.setLint(lint);
1008 boolean ctorProloguePrev = env.info.ctorPrologue;
1009 Assert.check(!env.info.ctorPrologue);
1010 MethodSymbol prevMethod = chk.setMethod(m);
1011 try {
1012 deferredLintHandler.flush(tree.pos(), lint);
1013 chk.checkDeprecatedAnnotation(tree.pos(), m);
1014
1015
1016 // Create a new environment with local scope
1017 // for attributing the method.
1018 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1019 localEnv.info.lint = lint;
1020
1021 attribStats(tree.typarams, localEnv);
1022
1023 // If we override any other methods, check that we do so properly.
1024 // JLS ???
1025 if (m.isStatic()) {
1026 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1027 } else {
1028 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1029 }
1030 chk.checkOverride(env, tree, m);
1031
1032 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1033 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1034 }
1035
1036 // Enter all type parameters into the local method scope.
1037 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1038 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1039
1040 ClassSymbol owner = env.enclClass.sym;
1041 if ((owner.flags() & ANNOTATION) != 0 &&
1042 (tree.params.nonEmpty() ||
1043 tree.recvparam != null))
1044 log.error(tree.params.nonEmpty() ?
1045 tree.params.head.pos() :
1046 tree.recvparam.pos(),
1047 Errors.IntfAnnotationMembersCantHaveParams);
1048
1049 // Attribute all value parameters.
1050 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1051 attribStat(l.head, localEnv);
1052 }
1053
1054 chk.checkVarargsMethodDecl(localEnv, tree);
1055
1056 // Check that type parameters are well-formed.
1057 chk.validate(tree.typarams, localEnv);
1058
1059 // Check that result type is well-formed.
1060 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1061 chk.validate(tree.restype, localEnv);
1062
1063 // Check that receiver type is well-formed.
1064 if (tree.recvparam != null) {
1065 // Use a new environment to check the receiver parameter.
1066 // Otherwise I get "might not have been initialized" errors.
1067 // Is there a better way?
1068 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1069 attribType(tree.recvparam, newEnv);
1070 chk.validate(tree.recvparam, newEnv);
1071 }
1072
1073 // Is this method a constructor?
1074 boolean isConstructor = TreeInfo.isConstructor(tree);
1075
1076 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1077 // lets find if this method is an accessor
1078 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1079 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1080 if (recordComponent.isPresent()) {
1081 // the method is a user defined accessor lets check that everything is fine
1082 if (!tree.sym.isPublic()) {
1083 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1084 }
1085 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1086 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1087 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1088 }
1089 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1090 log.error(tree,
1091 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1092 }
1093 if (!tree.typarams.isEmpty()) {
1094 log.error(tree,
1095 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1096 }
1097 if (tree.sym.isStatic()) {
1098 log.error(tree,
1099 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1100 }
1101 }
1102
1103 if (isConstructor) {
1104 // if this a constructor other than the canonical one
1105 if ((tree.sym.flags_field & RECORD) == 0) {
1106 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1107 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1108 }
1109 } else {
1110 // but if it is the canonical:
1111
1112 /* if user generated, then it shouldn't:
1113 * - have an accessibility stricter than that of the record type
1114 * - explicitly invoke any other constructor
1115 */
1116 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1117 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1118 log.error(tree,
1119 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1120 Errors.InvalidCanonicalConstructorInRecord(
1121 Fragments.Canonical,
1122 env.enclClass.sym.name,
1123 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1124 ) :
1125 Errors.InvalidCanonicalConstructorInRecord(
1126 Fragments.Canonical,
1127 env.enclClass.sym.name,
1128 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1129 )
1130 );
1131 }
1132
1133 if (TreeInfo.hasAnyConstructorCall(tree)) {
1134 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1135 Fragments.Canonical, env.enclClass.sym.name,
1136 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1137 }
1138 }
1139
1140 // also we want to check that no type variables have been defined
1141 if (!tree.typarams.isEmpty()) {
1142 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1143 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1144 }
1145
1146 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1147 * record components
1148 */
1149 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1150 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1151 for (JCVariableDecl param: tree.params) {
1152 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1153 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1154 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1155 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1156 Fragments.Canonical, env.enclClass.sym.name,
1157 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1158 }
1159 recordComponents = recordComponents.tail;
1160 recordFieldTypes = recordFieldTypes.tail;
1161 }
1162 }
1163 }
1164 }
1165
1166 // annotation method checks
1167 if ((owner.flags() & ANNOTATION) != 0) {
1168 // annotation method cannot have throws clause
1169 if (tree.thrown.nonEmpty()) {
1170 log.error(tree.thrown.head.pos(),
1171 Errors.ThrowsNotAllowedInIntfAnnotation);
1172 }
1173 // annotation method cannot declare type-parameters
1174 if (tree.typarams.nonEmpty()) {
1175 log.error(tree.typarams.head.pos(),
1176 Errors.IntfAnnotationMembersCantHaveTypeParams);
1177 }
1178 // validate annotation method's return type (could be an annotation type)
1179 chk.validateAnnotationType(tree.restype);
1180 // ensure that annotation method does not clash with members of Object/Annotation
1181 chk.validateAnnotationMethod(tree.pos(), m);
1182 }
1183
1184 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1185 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1186
1187 if (tree.body == null) {
1188 // Empty bodies are only allowed for
1189 // abstract, native, or interface methods, or for methods
1190 // in a retrofit signature class.
1191 if (tree.defaultValue != null) {
1192 if ((owner.flags() & ANNOTATION) == 0)
1193 log.error(tree.pos(),
1194 Errors.DefaultAllowedInIntfAnnotationMember);
1195 }
1196 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1197 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1198 } else {
1199 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1200 if ((owner.flags() & INTERFACE) != 0) {
1201 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1202 } else {
1203 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1204 }
1205 } else if ((tree.mods.flags & NATIVE) != 0) {
1206 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1207 }
1208 // Add an implicit super() call unless an explicit call to
1209 // super(...) or this(...) is given
1210 // or we are compiling class java.lang.Object.
1211 if (isConstructor && owner.type != syms.objectType) {
1212 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1213 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1214 make.Ident(names._super), make.Idents(List.nil())));
1215 if (owner.isValueClass()) {
1216 tree.body.stats = tree.body.stats.append(supCall);
1217 } else {
1218 tree.body.stats = tree.body.stats.prepend(supCall);
1219 }
1220 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1221 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1222 TreeInfo.hasConstructorCall(tree, names._super)) {
1223 // enum constructors are not allowed to call super
1224 // directly, so make sure there aren't any super calls
1225 // in enum constructors, except in the compiler
1226 // generated one.
1227 log.error(tree.body.stats.head.pos(),
1228 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1229 }
1230 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1231 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1232 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1233 if (!initParamNames.equals(recordComponentNames)) {
1234 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1235 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1236 }
1237 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1238 log.error(tree,
1239 Errors.InvalidCanonicalConstructorInRecord(
1240 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1241 env.enclClass.sym.name,
1242 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1243 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1244 }
1245 }
1246 }
1247
1248 // Attribute all type annotations in the body
1249 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1250 annotate.flush();
1251
1252 // Start of constructor prologue
1253 localEnv.info.ctorPrologue = isConstructor;
1254
1255 // Attribute method body.
1256 attribStat(tree.body, localEnv);
1257 }
1258
1259 localEnv.info.scope.leave();
1260 result = tree.type = m.type;
1261 } finally {
1262 chk.setLint(prevLint);
1263 chk.setMethod(prevMethod);
1264 env.info.ctorPrologue = ctorProloguePrev;
1265 }
1266 }
1267
1268 public void visitVarDef(JCVariableDecl tree) {
1269 // Local variables have not been entered yet, so we need to do it now:
1270 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1271 if (tree.sym != null) {
1272 // parameters have already been entered
1273 env.info.scope.enter(tree.sym);
1274 } else {
1275 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1276 if (tree.init == null) {
1277 //cannot use 'var' without initializer
1278 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1279 tree.vartype = make.Erroneous();
1280 } else {
1281 Fragment msg = canInferLocalVarType(tree);
1282 if (msg != null) {
1283 //cannot use 'var' with initializer which require an explicit target
1284 //(e.g. lambda, method reference, array initializer).
1285 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1286 tree.vartype = make.Erroneous();
1287 }
1288 }
1289 }
1290 try {
1291 annotate.blockAnnotations();
1292 memberEnter.memberEnter(tree, env);
1293 } finally {
1294 annotate.unblockAnnotations();
1295 }
1296 }
1297 } else {
1298 if (tree.init != null) {
1299 // Field initializer expression need to be entered.
1300 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1301 annotate.flush();
1302 }
1303 }
1304
1305 VarSymbol v = tree.sym;
1306 Lint lint = env.info.lint.augment(v);
1307 Lint prevLint = chk.setLint(lint);
1308
1309 // Check that the variable's declared type is well-formed.
1310 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1311 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1312 (tree.sym.flags() & PARAMETER) != 0;
1313 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1314
1315 try {
1316 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1317 deferredLintHandler.flush(tree.pos(), lint);
1318 chk.checkDeprecatedAnnotation(tree.pos(), v);
1319
1320 if (tree.init != null) {
1321 if ((v.flags_field & FINAL) == 0 ||
1322 !memberEnter.needsLazyConstValue(tree.init)) {
1323 // Not a compile-time constant
1324 // Attribute initializer in a new environment
1325 // with the declared variable as owner.
1326 // Check that initializer conforms to variable's declared type.
1327 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1328 initEnv.info.lint = lint;
1329 // In order to catch self-references, we set the variable's
1330 // declaration position to maximal possible value, effectively
1331 // marking the variable as undefined.
1332 initEnv.info.enclVar = v;
1333 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1334 try {
1335 if (v.owner.kind == TYP && v.owner.isValueClass() && !v.isStatic()) {
1336 // strict instance initializer in a value class
1337 initEnv.info.ctorPrologue = true;
1338 }
1339 attribExpr(tree.init, initEnv, v.type);
1340 if (tree.isImplicitlyTyped()) {
1341 //fixup local variable type
1342 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1343 }
1344 } finally {
1345 initEnv.info.ctorPrologue = previousCtorPrologue;
1346 }
1347 }
1348 if (tree.isImplicitlyTyped()) {
1349 setSyntheticVariableType(tree, v.type);
1350 }
1351 }
1352 result = tree.type = v.type;
1353 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1354 if (isNonArgsMethodInObject(v.name)) {
1355 log.error(tree, Errors.IllegalRecordComponentName(v));
1356 }
1357 }
1358 }
1359 finally {
1360 chk.setLint(prevLint);
1361 }
1362 }
1363
1364 private boolean isNonArgsMethodInObject(Name name) {
1365 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1366 if (s.type.getParameterTypes().isEmpty()) {
1367 return true;
1368 }
1369 }
1370 return false;
1371 }
1372
1373 Fragment canInferLocalVarType(JCVariableDecl tree) {
1374 LocalInitScanner lis = new LocalInitScanner();
1375 lis.scan(tree.init);
1376 return lis.badInferenceMsg;
1377 }
1378
1379 static class LocalInitScanner extends TreeScanner {
1380 Fragment badInferenceMsg = null;
1381 boolean needsTarget = true;
1382
1383 @Override
1384 public void visitNewArray(JCNewArray tree) {
1385 if (tree.elemtype == null && needsTarget) {
1386 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1387 }
1388 }
1389
1390 @Override
1391 public void visitLambda(JCLambda tree) {
1392 if (needsTarget) {
1393 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1394 }
1395 }
1396
1397 @Override
1398 public void visitTypeCast(JCTypeCast tree) {
1399 boolean prevNeedsTarget = needsTarget;
1400 try {
1401 needsTarget = false;
1402 super.visitTypeCast(tree);
1403 } finally {
1404 needsTarget = prevNeedsTarget;
1405 }
1406 }
1407
1408 @Override
1409 public void visitReference(JCMemberReference tree) {
1410 if (needsTarget) {
1411 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1412 }
1413 }
1414
1415 @Override
1416 public void visitNewClass(JCNewClass tree) {
1417 boolean prevNeedsTarget = needsTarget;
1418 try {
1419 needsTarget = false;
1420 super.visitNewClass(tree);
1421 } finally {
1422 needsTarget = prevNeedsTarget;
1423 }
1424 }
1425
1426 @Override
1427 public void visitApply(JCMethodInvocation tree) {
1428 boolean prevNeedsTarget = needsTarget;
1429 try {
1430 needsTarget = false;
1431 super.visitApply(tree);
1432 } finally {
1433 needsTarget = prevNeedsTarget;
1434 }
1435 }
1436 }
1437
1438 public void visitSkip(JCSkip tree) {
1439 result = null;
1440 }
1441
1442 public void visitBlock(JCBlock tree) {
1443 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1444 // Block is a static or instance initializer;
1445 // let the owner of the environment be a freshly
1446 // created BLOCK-method.
1447 Symbol fakeOwner =
1448 new MethodSymbol(tree.flags | BLOCK |
1449 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1450 env.info.scope.owner);
1451 final Env<AttrContext> localEnv =
1452 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1453
1454 if ((tree.flags & STATIC) != 0) {
1455 localEnv.info.staticLevel++;
1456 } else {
1457 localEnv.info.instanceInitializerBlock = true;
1458 }
1459 // Attribute all type annotations in the block
1460 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1461 annotate.flush();
1462 attribStats(tree.stats, localEnv);
1463
1464 {
1465 // Store init and clinit type annotations with the ClassSymbol
1466 // to allow output in Gen.normalizeDefs.
1467 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1468 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1469 if ((tree.flags & STATIC) != 0) {
1470 cs.appendClassInitTypeAttributes(tas);
1471 } else {
1472 cs.appendInitTypeAttributes(tas);
1473 }
1474 }
1475 } else {
1476 // Create a new local environment with a local scope.
1477 Env<AttrContext> localEnv =
1478 env.dup(tree, env.info.dup(env.info.scope.dup()));
1479 try {
1480 attribStats(tree.stats, localEnv);
1481 } finally {
1482 localEnv.info.scope.leave();
1483 }
1484 }
1485 result = null;
1486 }
1487
1488 public void visitDoLoop(JCDoWhileLoop tree) {
1489 attribStat(tree.body, env.dup(tree));
1490 attribExpr(tree.cond, env, syms.booleanType);
1491 handleLoopConditionBindings(matchBindings, tree, tree.body);
1492 result = null;
1493 }
1494
1495 public void visitWhileLoop(JCWhileLoop tree) {
1496 attribExpr(tree.cond, env, syms.booleanType);
1497 MatchBindings condBindings = matchBindings;
1498 // include condition's bindings when true in the body:
1499 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1500 try {
1501 attribStat(tree.body, whileEnv.dup(tree));
1502 } finally {
1503 whileEnv.info.scope.leave();
1504 }
1505 handleLoopConditionBindings(condBindings, tree, tree.body);
1506 result = null;
1507 }
1508
1509 public void visitForLoop(JCForLoop tree) {
1510 Env<AttrContext> loopEnv =
1511 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1512 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1513 try {
1514 attribStats(tree.init, loopEnv);
1515 if (tree.cond != null) {
1516 attribExpr(tree.cond, loopEnv, syms.booleanType);
1517 // include condition's bindings when true in the body and step:
1518 condBindings = matchBindings;
1519 }
1520 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1521 try {
1522 bodyEnv.tree = tree; // before, we were not in loop!
1523 attribStats(tree.step, bodyEnv);
1524 attribStat(tree.body, bodyEnv);
1525 } finally {
1526 bodyEnv.info.scope.leave();
1527 }
1528 result = null;
1529 }
1530 finally {
1531 loopEnv.info.scope.leave();
1532 }
1533 handleLoopConditionBindings(condBindings, tree, tree.body);
1534 }
1535
1536 /**
1537 * Include condition's bindings when false after the loop, if cannot get out of the loop
1538 */
1539 private void handleLoopConditionBindings(MatchBindings condBindings,
1540 JCStatement loop,
1541 JCStatement loopBody) {
1542 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1543 !breaksTo(env, loop, loopBody)) {
1544 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1545 }
1546 }
1547
1548 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1549 preFlow(body);
1550 return flow.breaksToTree(env, loop, body, make);
1551 }
1552
1553 /**
1554 * Add given bindings to the current scope, unless there's a break to
1555 * an immediately enclosing labeled statement.
1556 */
1557 private void addBindings2Scope(JCStatement introducingStatement,
1558 List<BindingSymbol> bindings) {
1559 if (bindings.isEmpty()) {
1560 return ;
1561 }
1562
1563 var searchEnv = env;
1564 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1565 labeled.body == introducingStatement) {
1566 if (breaksTo(env, labeled, labeled.body)) {
1567 //breaking to an immediately enclosing labeled statement
1568 return ;
1569 }
1570 searchEnv = searchEnv.next;
1571 introducingStatement = labeled;
1572 }
1573
1574 //include condition's body when false after the while, if cannot get out of the loop
1575 bindings.forEach(env.info.scope::enter);
1576 bindings.forEach(BindingSymbol::preserveBinding);
1577 }
1578
1579 public void visitForeachLoop(JCEnhancedForLoop tree) {
1580 Env<AttrContext> loopEnv =
1581 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1582 try {
1583 //the Formal Parameter of a for-each loop is not in the scope when
1584 //attributing the for-each expression; we mimic this by attributing
1585 //the for-each expression first (against original scope).
1586 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1587 chk.checkNonVoid(tree.pos(), exprType);
1588 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1589 if (elemtype == null) {
1590 // or perhaps expr implements Iterable<T>?
1591 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1592 if (base == null) {
1593 log.error(tree.expr.pos(),
1594 Errors.ForeachNotApplicableToType(exprType,
1595 Fragments.TypeReqArrayOrIterable));
1596 elemtype = types.createErrorType(exprType);
1597 } else {
1598 List<Type> iterableParams = base.allparams();
1599 elemtype = iterableParams.isEmpty()
1600 ? syms.objectType
1601 : types.wildUpperBound(iterableParams.head);
1602
1603 // Check the return type of the method iterator().
1604 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1605 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1606 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1607 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1608 log.error(tree.pos(),
1609 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1610 }
1611 }
1612 }
1613 if (tree.var.isImplicitlyTyped()) {
1614 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1615 setSyntheticVariableType(tree.var, inferredType);
1616 }
1617 attribStat(tree.var, loopEnv);
1618 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1619 loopEnv.tree = tree; // before, we were not in loop!
1620 attribStat(tree.body, loopEnv);
1621 result = null;
1622 }
1623 finally {
1624 loopEnv.info.scope.leave();
1625 }
1626 }
1627
1628 public void visitLabelled(JCLabeledStatement tree) {
1629 // Check that label is not used in an enclosing statement
1630 Env<AttrContext> env1 = env;
1631 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1632 if (env1.tree.hasTag(LABELLED) &&
1633 ((JCLabeledStatement) env1.tree).label == tree.label) {
1634 log.error(tree.pos(),
1635 Errors.LabelAlreadyInUse(tree.label));
1636 break;
1637 }
1638 env1 = env1.next;
1639 }
1640
1641 attribStat(tree.body, env.dup(tree));
1642 result = null;
1643 }
1644
1645 public void visitSwitch(JCSwitch tree) {
1646 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1647 attribStats(c.stats, caseEnv);
1648 });
1649 result = null;
1650 }
1651
1652 public void visitSwitchExpression(JCSwitchExpression tree) {
1653 boolean wrongContext = false;
1654
1655 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1656 PolyKind.STANDALONE : PolyKind.POLY;
1657
1658 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1659 //this means we are returning a poly conditional from void-compatible lambda expression
1660 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1661 resultInfo = recoveryInfo;
1662 wrongContext = true;
1663 }
1664
1665 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1666 unknownExprInfo :
1667 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1668
1669 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1670 ListBuffer<Type> caseTypes = new ListBuffer<>();
1671
1672 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1673 caseEnv.info.yieldResult = condInfo;
1674 attribStats(c.stats, caseEnv);
1675 new TreeScanner() {
1676 @Override
1677 public void visitYield(JCYield brk) {
1678 if (brk.target == tree) {
1679 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1680 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1681 }
1682 super.visitYield(brk);
1683 }
1684
1685 @Override public void visitClassDef(JCClassDecl tree) {}
1686 @Override public void visitLambda(JCLambda tree) {}
1687 }.scan(c.stats);
1688 });
1689
1690 if (tree.cases.isEmpty()) {
1691 log.error(tree.pos(),
1692 Errors.SwitchExpressionEmpty);
1693 } else if (caseTypes.isEmpty()) {
1694 log.error(tree.pos(),
1695 Errors.SwitchExpressionNoResultExpressions);
1696 }
1697
1698 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1699
1700 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1701 }
1702 //where:
1703 CheckContext switchExpressionContext(CheckContext checkContext) {
1704 return new Check.NestedCheckContext(checkContext) {
1705 //this will use enclosing check context to check compatibility of
1706 //subexpression against target type; if we are in a method check context,
1707 //depending on whether boxing is allowed, we could have incompatibilities
1708 @Override
1709 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1710 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1711 }
1712 };
1713 }
1714
1715 private void handleSwitch(JCTree switchTree,
1716 JCExpression selector,
1717 List<JCCase> cases,
1718 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1719 Type seltype = attribExpr(selector, env);
1720
1721 Env<AttrContext> switchEnv =
1722 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1723
1724 try {
1725 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1726 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1727 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1728 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1729 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1730 boolean patternSwitch;
1731 if (seltype.isPrimitive() && !intSwitch) {
1732 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1733 patternSwitch = true;
1734 }
1735 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1736 !intSwitch) {
1737 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1738 patternSwitch = true;
1739 } else {
1740 patternSwitch = cases.stream()
1741 .flatMap(c -> c.labels.stream())
1742 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1743 TreeInfo.isNullCaseLabel(l));
1744 }
1745
1746 // Attribute all cases and
1747 // check that there are no duplicate case labels or default clauses.
1748 Set<Object> constants = new HashSet<>(); // The set of case constants.
1749 boolean hasDefault = false; // Is there a default label?
1750 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1751 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1752 boolean hasNullPattern = false; // Is there a null pattern?
1753 CaseTree.CaseKind caseKind = null;
1754 boolean wasError = false;
1755 JCCaseLabel unconditionalCaseLabel = null;
1756 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1757 JCCase c = l.head;
1758 if (caseKind == null) {
1759 caseKind = c.caseKind;
1760 } else if (caseKind != c.caseKind && !wasError) {
1761 log.error(c.pos(),
1762 Errors.SwitchMixingCaseTypes);
1763 wasError = true;
1764 }
1765 MatchBindings currentBindings = null;
1766 MatchBindings guardBindings = null;
1767 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1768 JCCaseLabel label = labels.head;
1769 if (label instanceof JCConstantCaseLabel constLabel) {
1770 JCExpression expr = constLabel.expr;
1771 if (TreeInfo.isNull(expr)) {
1772 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1773 if (hasNullPattern) {
1774 log.error(label.pos(), Errors.DuplicateCaseLabel);
1775 }
1776 hasNullPattern = true;
1777 attribExpr(expr, switchEnv, seltype);
1778 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1779 } else if (enumSwitch) {
1780 Symbol sym = enumConstant(expr, seltype);
1781 if (sym == null) {
1782 if (allowPatternSwitch) {
1783 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1784 Symbol enumSym = TreeInfo.symbol(expr);
1785 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1786 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1787 } else if (!constants.add(enumSym)) {
1788 log.error(label.pos(), Errors.DuplicateCaseLabel);
1789 }
1790 } else {
1791 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1792 }
1793 } else if (!constants.add(sym)) {
1794 log.error(label.pos(), Errors.DuplicateCaseLabel);
1795 }
1796 } else if (errorEnumSwitch) {
1797 //error recovery: the selector is erroneous, and all the case labels
1798 //are identifiers. This could be an enum switch - don't report resolve
1799 //error for the case label:
1800 var prevResolveHelper = rs.basicLogResolveHelper;
1801 try {
1802 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1803 attribExpr(expr, switchEnv, seltype);
1804 } finally {
1805 rs.basicLogResolveHelper = prevResolveHelper;
1806 }
1807 } else {
1808 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1809 if (!pattype.hasTag(ERROR)) {
1810 if (pattype.constValue() == null) {
1811 Symbol s = TreeInfo.symbol(expr);
1812 if (s != null && s.kind == TYP) {
1813 log.error(expr.pos(),
1814 Errors.PatternExpected);
1815 } else if (s == null || !s.isEnum()) {
1816 log.error(expr.pos(),
1817 (stringSwitch ? Errors.StringConstReq
1818 : intSwitch ? Errors.ConstExprReq
1819 : Errors.PatternOrEnumReq));
1820 } else if (!constants.add(s)) {
1821 log.error(label.pos(), Errors.DuplicateCaseLabel);
1822 }
1823 }
1824 else {
1825 if (!stringSwitch && !intSwitch &&
1826 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1827 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1828 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1829 } else if (!constants.add(pattype.constValue())) {
1830 log.error(c.pos(), Errors.DuplicateCaseLabel);
1831 }
1832 }
1833 }
1834 }
1835 } else if (label instanceof JCDefaultCaseLabel def) {
1836 if (hasDefault) {
1837 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1838 } else if (hasUnconditionalPattern) {
1839 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1840 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1841 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1842 }
1843 hasDefault = true;
1844 matchBindings = MatchBindingsComputer.EMPTY;
1845 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1846 //pattern
1847 JCPattern pat = patternlabel.pat;
1848 attribExpr(pat, switchEnv, seltype);
1849 Type primaryType = TreeInfo.primaryPatternType(pat);
1850
1851 if (primaryType.isPrimitive()) {
1852 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1853 } else if (!primaryType.hasTag(TYPEVAR)) {
1854 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1855 }
1856 checkCastablePattern(pat.pos(), seltype, primaryType);
1857 Type patternType = types.erasure(primaryType);
1858 JCExpression guard = c.guard;
1859 if (guardBindings == null && guard != null) {
1860 MatchBindings afterPattern = matchBindings;
1861 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1862 try {
1863 attribExpr(guard, bodyEnv, syms.booleanType);
1864 } finally {
1865 bodyEnv.info.scope.leave();
1866 }
1867
1868 guardBindings = matchBindings;
1869 matchBindings = afterPattern;
1870
1871 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1872 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1873 }
1874 }
1875 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1876 boolean unconditional =
1877 unguarded &&
1878 !patternType.isErroneous() &&
1879 types.isUnconditionallyExact(seltype, patternType);
1880 if (unconditional) {
1881 if (hasUnconditionalPattern) {
1882 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1883 } else if (hasDefault) {
1884 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1885 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1886 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1887 }
1888 hasUnconditionalPattern = true;
1889 unconditionalCaseLabel = label;
1890 }
1891 lastPatternErroneous = patternType.isErroneous();
1892 } else {
1893 Assert.error();
1894 }
1895 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1896 }
1897
1898 if (guardBindings != null) {
1899 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1900 }
1901
1902 Env<AttrContext> caseEnv =
1903 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1904 try {
1905 attribCase.accept(c, caseEnv);
1906 } finally {
1907 caseEnv.info.scope.leave();
1908 }
1909 addVars(c.stats, switchEnv.info.scope);
1910
1911 preFlow(c);
1912 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1913 }
1914 if (patternSwitch) {
1915 chk.checkSwitchCaseStructure(cases);
1916 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1917 }
1918 if (switchTree.hasTag(SWITCH)) {
1919 ((JCSwitch) switchTree).hasUnconditionalPattern =
1920 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1921 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1922 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1923 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1924 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1925 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1926 } else {
1927 Assert.error(switchTree.getTag().name());
1928 }
1929 } finally {
1930 switchEnv.info.scope.leave();
1931 }
1932 }
1933 // where
1934 private ResultInfo caseLabelResultInfo(Type seltype) {
1935 return new ResultInfo(KindSelector.VAL_TYP,
1936 !seltype.hasTag(ERROR) ? seltype
1937 : Type.noType);
1938 }
1939 /** Add any variables defined in stats to the switch scope. */
1940 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1941 for (;stats.nonEmpty(); stats = stats.tail) {
1942 JCTree stat = stats.head;
1943 if (stat.hasTag(VARDEF))
1944 switchScope.enter(((JCVariableDecl) stat).sym);
1945 }
1946 }
1947 // where
1948 /** Return the selected enumeration constant symbol, or null. */
1949 private Symbol enumConstant(JCTree tree, Type enumType) {
1950 if (tree.hasTag(IDENT)) {
1951 JCIdent ident = (JCIdent)tree;
1952 Name name = ident.name;
1953 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1954 if (sym.kind == VAR) {
1955 Symbol s = ident.sym = sym;
1956 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1957 ident.type = s.type;
1958 return ((s.flags_field & Flags.ENUM) == 0)
1959 ? null : s;
1960 }
1961 }
1962 }
1963 return null;
1964 }
1965
1966 public void visitSynchronized(JCSynchronized tree) {
1967 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1968 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) &&
1969 identityType &&
1970 isValueBased(tree.lock.type)) {
1971 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1972 }
1973 attribStat(tree.body, env);
1974 result = null;
1975 }
1976 // where
1977 private boolean isValueBased(Type t) {
1978 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1979 }
1980
1981 public void visitTry(JCTry tree) {
1982 // Create a new local environment with a local
1983 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1984 try {
1985 boolean isTryWithResource = tree.resources.nonEmpty();
1986 // Create a nested environment for attributing the try block if needed
1987 Env<AttrContext> tryEnv = isTryWithResource ?
1988 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1989 localEnv;
1990 try {
1991 // Attribute resource declarations
1992 for (JCTree resource : tree.resources) {
1993 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1994 @Override
1995 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1996 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1997 }
1998 };
1999 ResultInfo twrResult =
2000 new ResultInfo(KindSelector.VAR,
2001 syms.autoCloseableType,
2002 twrContext);
2003 if (resource.hasTag(VARDEF)) {
2004 attribStat(resource, tryEnv);
2005 twrResult.check(resource, resource.type);
2006
2007 //check that resource type cannot throw InterruptedException
2008 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2009
2010 VarSymbol var = ((JCVariableDecl) resource).sym;
2011
2012 var.flags_field |= Flags.FINAL;
2013 var.setData(ElementKind.RESOURCE_VARIABLE);
2014 } else {
2015 attribTree(resource, tryEnv, twrResult);
2016 }
2017 }
2018 // Attribute body
2019 attribStat(tree.body, tryEnv);
2020 } finally {
2021 if (isTryWithResource)
2022 tryEnv.info.scope.leave();
2023 }
2024
2025 // Attribute catch clauses
2026 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2027 JCCatch c = l.head;
2028 Env<AttrContext> catchEnv =
2029 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2030 try {
2031 Type ctype = attribStat(c.param, catchEnv);
2032 if (TreeInfo.isMultiCatch(c)) {
2033 //multi-catch parameter is implicitly marked as final
2034 c.param.sym.flags_field |= FINAL | UNION;
2035 }
2036 if (c.param.sym.kind == VAR) {
2037 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2038 }
2039 chk.checkType(c.param.vartype.pos(),
2040 chk.checkClassType(c.param.vartype.pos(), ctype),
2041 syms.throwableType);
2042 attribStat(c.body, catchEnv);
2043 } finally {
2044 catchEnv.info.scope.leave();
2045 }
2046 }
2047
2048 // Attribute finalizer
2049 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2050 result = null;
2051 }
2052 finally {
2053 localEnv.info.scope.leave();
2054 }
2055 }
2056
2057 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2058 if (!resource.isErroneous() &&
2059 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2060 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2061 Symbol close = syms.noSymbol;
2062 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2063 try {
2064 close = rs.resolveQualifiedMethod(pos,
2065 env,
2066 types.skipTypeVars(resource, false),
2067 names.close,
2068 List.nil(),
2069 List.nil());
2070 }
2071 finally {
2072 log.popDiagnosticHandler(discardHandler);
2073 }
2074 if (close.kind == MTH &&
2075 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2076 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2077 env.info.lint.isEnabled(LintCategory.TRY)) {
2078 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2079 }
2080 }
2081 }
2082
2083 public void visitConditional(JCConditional tree) {
2084 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2085 MatchBindings condBindings = matchBindings;
2086
2087 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2088 isBooleanOrNumeric(env, tree)) ?
2089 PolyKind.STANDALONE : PolyKind.POLY;
2090
2091 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2092 //this means we are returning a poly conditional from void-compatible lambda expression
2093 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2094 result = tree.type = types.createErrorType(resultInfo.pt);
2095 return;
2096 }
2097
2098 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2099 unknownExprInfo :
2100 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2101
2102
2103 // x ? y : z
2104 // include x's bindings when true in y
2105 // include x's bindings when false in z
2106
2107 Type truetype;
2108 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2109 try {
2110 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2111 } finally {
2112 trueEnv.info.scope.leave();
2113 }
2114
2115 MatchBindings trueBindings = matchBindings;
2116
2117 Type falsetype;
2118 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2119 try {
2120 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2121 } finally {
2122 falseEnv.info.scope.leave();
2123 }
2124
2125 MatchBindings falseBindings = matchBindings;
2126
2127 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2128 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2129 List.of(truetype, falsetype)) : pt();
2130 if (condtype.constValue() != null &&
2131 truetype.constValue() != null &&
2132 falsetype.constValue() != null &&
2133 !owntype.hasTag(NONE)) {
2134 //constant folding
2135 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2136 }
2137 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2138 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2139 }
2140 //where
2141 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2142 switch (tree.getTag()) {
2143 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2144 ((JCLiteral)tree).typetag == BOOLEAN ||
2145 ((JCLiteral)tree).typetag == BOT;
2146 case LAMBDA: case REFERENCE: return false;
2147 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2148 case CONDEXPR:
2149 JCConditional condTree = (JCConditional)tree;
2150 return isBooleanOrNumeric(env, condTree.truepart) &&
2151 isBooleanOrNumeric(env, condTree.falsepart);
2152 case APPLY:
2153 JCMethodInvocation speculativeMethodTree =
2154 (JCMethodInvocation)deferredAttr.attribSpeculative(
2155 tree, env, unknownExprInfo,
2156 argumentAttr.withLocalCacheContext());
2157 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2158 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2159 env.enclClass.type :
2160 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2161 Type owntype = types.memberType(receiverType, msym).getReturnType();
2162 return primitiveOrBoxed(owntype);
2163 case NEWCLASS:
2164 JCExpression className =
2165 removeClassParams.translate(((JCNewClass)tree).clazz);
2166 JCExpression speculativeNewClassTree =
2167 (JCExpression)deferredAttr.attribSpeculative(
2168 className, env, unknownTypeInfo,
2169 argumentAttr.withLocalCacheContext());
2170 return primitiveOrBoxed(speculativeNewClassTree.type);
2171 default:
2172 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2173 argumentAttr.withLocalCacheContext()).type;
2174 return primitiveOrBoxed(speculativeType);
2175 }
2176 }
2177 //where
2178 boolean primitiveOrBoxed(Type t) {
2179 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2180 }
2181
2182 TreeTranslator removeClassParams = new TreeTranslator() {
2183 @Override
2184 public void visitTypeApply(JCTypeApply tree) {
2185 result = translate(tree.clazz);
2186 }
2187 };
2188
2189 CheckContext conditionalContext(CheckContext checkContext) {
2190 return new Check.NestedCheckContext(checkContext) {
2191 //this will use enclosing check context to check compatibility of
2192 //subexpression against target type; if we are in a method check context,
2193 //depending on whether boxing is allowed, we could have incompatibilities
2194 @Override
2195 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2196 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2197 }
2198 };
2199 }
2200
2201 /** Compute the type of a conditional expression, after
2202 * checking that it exists. See JLS 15.25. Does not take into
2203 * account the special case where condition and both arms
2204 * are constants.
2205 *
2206 * @param pos The source position to be used for error
2207 * diagnostics.
2208 * @param thentype The type of the expression's then-part.
2209 * @param elsetype The type of the expression's else-part.
2210 */
2211 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2212 if (condTypes.isEmpty()) {
2213 return syms.objectType; //TODO: how to handle?
2214 }
2215 Type first = condTypes.head;
2216 // If same type, that is the result
2217 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2218 return first.baseType();
2219
2220 List<Type> unboxedTypes = condTypes.stream()
2221 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2222 .collect(List.collector());
2223
2224 // Otherwise, if both arms can be converted to a numeric
2225 // type, return the least numeric type that fits both arms
2226 // (i.e. return larger of the two, or return int if one
2227 // arm is short, the other is char).
2228 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2229 // If one arm has an integer subrange type (i.e., byte,
2230 // short, or char), and the other is an integer constant
2231 // that fits into the subrange, return the subrange type.
2232 for (Type type : unboxedTypes) {
2233 if (!type.getTag().isStrictSubRangeOf(INT)) {
2234 continue;
2235 }
2236 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2237 return type.baseType();
2238 }
2239
2240 for (TypeTag tag : primitiveTags) {
2241 Type candidate = syms.typeOfTag[tag.ordinal()];
2242 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2243 return candidate;
2244 }
2245 }
2246 }
2247
2248 // Those were all the cases that could result in a primitive
2249 condTypes = condTypes.stream()
2250 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2251 .collect(List.collector());
2252
2253 for (Type type : condTypes) {
2254 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2255 return type.baseType();
2256 }
2257
2258 Iterator<DiagnosticPosition> posIt = positions.iterator();
2259
2260 condTypes = condTypes.stream()
2261 .map(t -> chk.checkNonVoid(posIt.next(), t))
2262 .collect(List.collector());
2263
2264 // both are known to be reference types. The result is
2265 // lub(thentype,elsetype). This cannot fail, as it will
2266 // always be possible to infer "Object" if nothing better.
2267 return types.lub(condTypes.stream()
2268 .map(t -> t.baseType())
2269 .filter(t -> !t.hasTag(BOT))
2270 .collect(List.collector()));
2271 }
2272
2273 static final TypeTag[] primitiveTags = new TypeTag[]{
2274 BYTE,
2275 CHAR,
2276 SHORT,
2277 INT,
2278 LONG,
2279 FLOAT,
2280 DOUBLE,
2281 BOOLEAN,
2282 };
2283
2284 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2285 return bindingEnv(env, env.tree, bindings);
2286 }
2287
2288 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2289 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2290 bindings.forEach(env1.info.scope::enter);
2291 return env1;
2292 }
2293
2294 public void visitIf(JCIf tree) {
2295 attribExpr(tree.cond, env, syms.booleanType);
2296
2297 // if (x) { y } [ else z ]
2298 // include x's bindings when true in y
2299 // include x's bindings when false in z
2300
2301 MatchBindings condBindings = matchBindings;
2302 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2303
2304 try {
2305 attribStat(tree.thenpart, thenEnv);
2306 } finally {
2307 thenEnv.info.scope.leave();
2308 }
2309
2310 preFlow(tree.thenpart);
2311 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2312 boolean aliveAfterElse;
2313
2314 if (tree.elsepart != null) {
2315 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2316 try {
2317 attribStat(tree.elsepart, elseEnv);
2318 } finally {
2319 elseEnv.info.scope.leave();
2320 }
2321 preFlow(tree.elsepart);
2322 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2323 } else {
2324 aliveAfterElse = true;
2325 }
2326
2327 chk.checkEmptyIf(tree);
2328
2329 List<BindingSymbol> afterIfBindings = List.nil();
2330
2331 if (aliveAfterThen && !aliveAfterElse) {
2332 afterIfBindings = condBindings.bindingsWhenTrue;
2333 } else if (aliveAfterElse && !aliveAfterThen) {
2334 afterIfBindings = condBindings.bindingsWhenFalse;
2335 }
2336
2337 addBindings2Scope(tree, afterIfBindings);
2338
2339 result = null;
2340 }
2341
2342 void preFlow(JCTree tree) {
2343 attrRecover.doRecovery();
2344 new PostAttrAnalyzer() {
2345 @Override
2346 public void scan(JCTree tree) {
2347 if (tree == null ||
2348 (tree.type != null &&
2349 tree.type == Type.stuckType)) {
2350 //don't touch stuck expressions!
2351 return;
2352 }
2353 super.scan(tree);
2354 }
2355
2356 @Override
2357 public void visitClassDef(JCClassDecl that) {
2358 if (that.sym != null) {
2359 // Method preFlow shouldn't visit class definitions
2360 // that have not been entered and attributed.
2361 // See JDK-8254557 and JDK-8203277 for more details.
2362 super.visitClassDef(that);
2363 }
2364 }
2365
2366 @Override
2367 public void visitLambda(JCLambda that) {
2368 if (that.type != null) {
2369 // Method preFlow shouldn't visit lambda expressions
2370 // that have not been entered and attributed.
2371 // See JDK-8254557 and JDK-8203277 for more details.
2372 super.visitLambda(that);
2373 }
2374 }
2375 }.scan(tree);
2376 }
2377
2378 public void visitExec(JCExpressionStatement tree) {
2379 //a fresh environment is required for 292 inference to work properly ---
2380 //see Infer.instantiatePolymorphicSignatureInstance()
2381 Env<AttrContext> localEnv = env.dup(tree);
2382 attribExpr(tree.expr, localEnv);
2383 result = null;
2384 }
2385
2386 public void visitBreak(JCBreak tree) {
2387 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2388 result = null;
2389 }
2390
2391 public void visitYield(JCYield tree) {
2392 if (env.info.yieldResult != null) {
2393 attribTree(tree.value, env, env.info.yieldResult);
2394 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2395 } else {
2396 log.error(tree.pos(), tree.value.hasTag(PARENS)
2397 ? Errors.NoSwitchExpressionQualify
2398 : Errors.NoSwitchExpression);
2399 attribTree(tree.value, env, unknownExprInfo);
2400 }
2401 result = null;
2402 }
2403
2404 public void visitContinue(JCContinue tree) {
2405 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2406 result = null;
2407 }
2408 //where
2409 /** Return the target of a break, continue or yield statement,
2410 * if it exists, report an error if not.
2411 * Note: The target of a labelled break or continue is the
2412 * (non-labelled) statement tree referred to by the label,
2413 * not the tree representing the labelled statement itself.
2414 *
2415 * @param pos The position to be used for error diagnostics
2416 * @param tag The tag of the jump statement. This is either
2417 * Tree.BREAK or Tree.CONTINUE.
2418 * @param label The label of the jump statement, or null if no
2419 * label is given.
2420 * @param env The environment current at the jump statement.
2421 */
2422 private JCTree findJumpTarget(DiagnosticPosition pos,
2423 JCTree.Tag tag,
2424 Name label,
2425 Env<AttrContext> env) {
2426 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2427
2428 if (jumpTarget.snd != null) {
2429 log.error(pos, jumpTarget.snd);
2430 }
2431
2432 return jumpTarget.fst;
2433 }
2434 /** Return the target of a break or continue statement, if it exists,
2435 * report an error if not.
2436 * Note: The target of a labelled break or continue is the
2437 * (non-labelled) statement tree referred to by the label,
2438 * not the tree representing the labelled statement itself.
2439 *
2440 * @param tag The tag of the jump statement. This is either
2441 * Tree.BREAK or Tree.CONTINUE.
2442 * @param label The label of the jump statement, or null if no
2443 * label is given.
2444 * @param env The environment current at the jump statement.
2445 */
2446 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2447 Name label,
2448 Env<AttrContext> env) {
2449 // Search environments outwards from the point of jump.
2450 Env<AttrContext> env1 = env;
2451 JCDiagnostic.Error pendingError = null;
2452 LOOP:
2453 while (env1 != null) {
2454 switch (env1.tree.getTag()) {
2455 case LABELLED:
2456 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2457 if (label == labelled.label) {
2458 // If jump is a continue, check that target is a loop.
2459 if (tag == CONTINUE) {
2460 if (!labelled.body.hasTag(DOLOOP) &&
2461 !labelled.body.hasTag(WHILELOOP) &&
2462 !labelled.body.hasTag(FORLOOP) &&
2463 !labelled.body.hasTag(FOREACHLOOP)) {
2464 pendingError = Errors.NotLoopLabel(label);
2465 }
2466 // Found labelled statement target, now go inwards
2467 // to next non-labelled tree.
2468 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2469 } else {
2470 return Pair.of(labelled, pendingError);
2471 }
2472 }
2473 break;
2474 case DOLOOP:
2475 case WHILELOOP:
2476 case FORLOOP:
2477 case FOREACHLOOP:
2478 if (label == null) return Pair.of(env1.tree, pendingError);
2479 break;
2480 case SWITCH:
2481 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2482 break;
2483 case SWITCH_EXPRESSION:
2484 if (tag == YIELD) {
2485 return Pair.of(env1.tree, null);
2486 } else if (tag == BREAK) {
2487 pendingError = Errors.BreakOutsideSwitchExpression;
2488 } else {
2489 pendingError = Errors.ContinueOutsideSwitchExpression;
2490 }
2491 break;
2492 case LAMBDA:
2493 case METHODDEF:
2494 case CLASSDEF:
2495 break LOOP;
2496 default:
2497 }
2498 env1 = env1.next;
2499 }
2500 if (label != null)
2501 return Pair.of(null, Errors.UndefLabel(label));
2502 else if (pendingError != null)
2503 return Pair.of(null, pendingError);
2504 else if (tag == CONTINUE)
2505 return Pair.of(null, Errors.ContOutsideLoop);
2506 else
2507 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2508 }
2509
2510 public void visitReturn(JCReturn tree) {
2511 // Check that there is an enclosing method which is
2512 // nested within than the enclosing class.
2513 if (env.info.returnResult == null) {
2514 log.error(tree.pos(), Errors.RetOutsideMeth);
2515 } else if (env.info.yieldResult != null) {
2516 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2517 if (tree.expr != null) {
2518 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2519 }
2520 } else if (!env.info.isLambda &&
2521 !env.info.isNewClass &&
2522 env.enclMethod != null &&
2523 TreeInfo.isCompactConstructor(env.enclMethod)) {
2524 log.error(env.enclMethod,
2525 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2526 } else {
2527 // Attribute return expression, if it exists, and check that
2528 // it conforms to result type of enclosing method.
2529 if (tree.expr != null) {
2530 if (env.info.returnResult.pt.hasTag(VOID)) {
2531 env.info.returnResult.checkContext.report(tree.expr.pos(),
2532 diags.fragment(Fragments.UnexpectedRetVal));
2533 }
2534 attribTree(tree.expr, env, env.info.returnResult);
2535 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2536 !env.info.returnResult.pt.hasTag(NONE)) {
2537 env.info.returnResult.checkContext.report(tree.pos(),
2538 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2539 }
2540 }
2541 result = null;
2542 }
2543
2544 public void visitThrow(JCThrow tree) {
2545 Type owntype = attribExpr(tree.expr, env, Type.noType);
2546 chk.checkType(tree, owntype, syms.throwableType);
2547 result = null;
2548 }
2549
2550 public void visitAssert(JCAssert tree) {
2551 attribExpr(tree.cond, env, syms.booleanType);
2552 if (tree.detail != null) {
2553 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2554 }
2555 result = null;
2556 }
2557
2558 /** Visitor method for method invocations.
2559 * NOTE: The method part of an application will have in its type field
2560 * the return type of the method, not the method's type itself!
2561 */
2562 public void visitApply(JCMethodInvocation tree) {
2563 // The local environment of a method application is
2564 // a new environment nested in the current one.
2565 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2566
2567 // The types of the actual method arguments.
2568 List<Type> argtypes;
2569
2570 // The types of the actual method type arguments.
2571 List<Type> typeargtypes = null;
2572
2573 Name methName = TreeInfo.name(tree.meth);
2574
2575 boolean isConstructorCall =
2576 methName == names._this || methName == names._super;
2577
2578 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2579 if (isConstructorCall) {
2580
2581 // Attribute arguments, yielding list of argument types.
2582 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2583 argtypes = argtypesBuf.toList();
2584 typeargtypes = attribTypes(tree.typeargs, localEnv);
2585
2586 // Done with this()/super() parameters. End of constructor prologue.
2587 env.info.ctorPrologue = false;
2588
2589 // Variable `site' points to the class in which the called
2590 // constructor is defined.
2591 Type site = env.enclClass.sym.type;
2592 if (methName == names._super) {
2593 if (site == syms.objectType) {
2594 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2595 site = types.createErrorType(syms.objectType);
2596 } else {
2597 site = types.supertype(site);
2598 }
2599 }
2600
2601 if (site.hasTag(CLASS)) {
2602 Type encl = site.getEnclosingType();
2603 while (encl != null && encl.hasTag(TYPEVAR))
2604 encl = encl.getUpperBound();
2605 if (encl.hasTag(CLASS)) {
2606 // we are calling a nested class
2607
2608 if (tree.meth.hasTag(SELECT)) {
2609 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2610
2611 // We are seeing a prefixed call, of the form
2612 // <expr>.super(...).
2613 // Check that the prefix expression conforms
2614 // to the outer instance type of the class.
2615 chk.checkRefType(qualifier.pos(),
2616 attribExpr(qualifier, localEnv,
2617 encl));
2618 } else if (methName == names._super) {
2619 // qualifier omitted; check for existence
2620 // of an appropriate implicit qualifier.
2621 rs.resolveImplicitThis(tree.meth.pos(),
2622 localEnv, site, true);
2623 }
2624 } else if (tree.meth.hasTag(SELECT)) {
2625 log.error(tree.meth.pos(),
2626 Errors.IllegalQualNotIcls(site.tsym));
2627 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2628 }
2629
2630 // if we're calling a java.lang.Enum constructor,
2631 // prefix the implicit String and int parameters
2632 if (site.tsym == syms.enumSym)
2633 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2634
2635 // Resolve the called constructor under the assumption
2636 // that we are referring to a superclass instance of the
2637 // current instance (JLS ???).
2638 boolean selectSuperPrev = localEnv.info.selectSuper;
2639 localEnv.info.selectSuper = true;
2640 localEnv.info.pendingResolutionPhase = null;
2641 Symbol sym = rs.resolveConstructor(
2642 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2643 localEnv.info.selectSuper = selectSuperPrev;
2644
2645 // Set method symbol to resolved constructor...
2646 TreeInfo.setSymbol(tree.meth, sym);
2647
2648 // ...and check that it is legal in the current context.
2649 // (this will also set the tree's type)
2650 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2651 checkId(tree.meth, site, sym, localEnv,
2652 new ResultInfo(kind, mpt));
2653 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2654 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2655 }
2656 // Otherwise, `site' is an error type and we do nothing
2657 result = tree.type = syms.voidType;
2658 } else {
2659 // Otherwise, we are seeing a regular method call.
2660 // Attribute the arguments, yielding list of argument types, ...
2661 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2662 argtypes = argtypesBuf.toList();
2663 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2664
2665 // ... and attribute the method using as a prototype a methodtype
2666 // whose formal argument types is exactly the list of actual
2667 // arguments (this will also set the method symbol).
2668 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2669 localEnv.info.pendingResolutionPhase = null;
2670 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2671
2672 // Compute the result type.
2673 Type restype = mtype.getReturnType();
2674 if (restype.hasTag(WILDCARD))
2675 throw new AssertionError(mtype);
2676
2677 Type qualifier = (tree.meth.hasTag(SELECT))
2678 ? ((JCFieldAccess) tree.meth).selected.type
2679 : env.enclClass.sym.type;
2680 Symbol msym = TreeInfo.symbol(tree.meth);
2681 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2682
2683 chk.checkRefTypes(tree.typeargs, typeargtypes);
2684
2685 // Check that value of resulting type is admissible in the
2686 // current context. Also, capture the return type
2687 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2688 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2689 }
2690 chk.validate(tree.typeargs, localEnv);
2691 }
2692 //where
2693 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2694 if (msym != null &&
2695 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2696 methodName == names.getClass &&
2697 argtypes.isEmpty()) {
2698 // as a special case, x.getClass() has type Class<? extends |X|>
2699 return new ClassType(restype.getEnclosingType(),
2700 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2701 BoundKind.EXTENDS,
2702 syms.boundClass)),
2703 restype.tsym,
2704 restype.getMetadata());
2705 } else if (msym != null &&
2706 msym.owner == syms.arrayClass &&
2707 methodName == names.clone &&
2708 types.isArray(qualifierType)) {
2709 // as a special case, array.clone() has a result that is
2710 // the same as static type of the array being cloned
2711 return qualifierType;
2712 } else {
2713 return restype;
2714 }
2715 }
2716
2717 /** Obtain a method type with given argument types.
2718 */
2719 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2720 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2721 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2722 }
2723
2724 public void visitNewClass(final JCNewClass tree) {
2725 Type owntype = types.createErrorType(tree.type);
2726
2727 // The local environment of a class creation is
2728 // a new environment nested in the current one.
2729 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2730
2731 // The anonymous inner class definition of the new expression,
2732 // if one is defined by it.
2733 JCClassDecl cdef = tree.def;
2734
2735 // If enclosing class is given, attribute it, and
2736 // complete class name to be fully qualified
2737 JCExpression clazz = tree.clazz; // Class field following new
2738 JCExpression clazzid; // Identifier in class field
2739 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2740 annoclazzid = null;
2741
2742 if (clazz.hasTag(TYPEAPPLY)) {
2743 clazzid = ((JCTypeApply) clazz).clazz;
2744 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2745 annoclazzid = (JCAnnotatedType) clazzid;
2746 clazzid = annoclazzid.underlyingType;
2747 }
2748 } else {
2749 if (clazz.hasTag(ANNOTATED_TYPE)) {
2750 annoclazzid = (JCAnnotatedType) clazz;
2751 clazzid = annoclazzid.underlyingType;
2752 } else {
2753 clazzid = clazz;
2754 }
2755 }
2756
2757 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2758
2759 if (tree.encl != null) {
2760 // We are seeing a qualified new, of the form
2761 // <expr>.new C <...> (...) ...
2762 // In this case, we let clazz stand for the name of the
2763 // allocated class C prefixed with the type of the qualifier
2764 // expression, so that we can
2765 // resolve it with standard techniques later. I.e., if
2766 // <expr> has type T, then <expr>.new C <...> (...)
2767 // yields a clazz T.C.
2768 Type encltype = chk.checkRefType(tree.encl.pos(),
2769 attribExpr(tree.encl, env));
2770 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2771 // from expr to the combined type, or not? Yes, do this.
2772 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2773 ((JCIdent) clazzid).name);
2774
2775 EndPosTable endPosTable = this.env.toplevel.endPositions;
2776 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2777 if (clazz.hasTag(ANNOTATED_TYPE)) {
2778 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2779 List<JCAnnotation> annos = annoType.annotations;
2780
2781 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2782 clazzid1 = make.at(tree.pos).
2783 TypeApply(clazzid1,
2784 ((JCTypeApply) clazz).arguments);
2785 }
2786
2787 clazzid1 = make.at(tree.pos).
2788 AnnotatedType(annos, clazzid1);
2789 } else if (clazz.hasTag(TYPEAPPLY)) {
2790 clazzid1 = make.at(tree.pos).
2791 TypeApply(clazzid1,
2792 ((JCTypeApply) clazz).arguments);
2793 }
2794
2795 clazz = clazzid1;
2796 }
2797
2798 // Attribute clazz expression and store
2799 // symbol + type back into the attributed tree.
2800 Type clazztype;
2801
2802 try {
2803 env.info.isNewClass = true;
2804 clazztype = TreeInfo.isEnumInit(env.tree) ?
2805 attribIdentAsEnumType(env, (JCIdent)clazz) :
2806 attribType(clazz, env);
2807 } finally {
2808 env.info.isNewClass = false;
2809 }
2810
2811 clazztype = chk.checkDiamond(tree, clazztype);
2812 chk.validate(clazz, localEnv);
2813 if (tree.encl != null) {
2814 // We have to work in this case to store
2815 // symbol + type back into the attributed tree.
2816 tree.clazz.type = clazztype;
2817 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2818 clazzid.type = ((JCIdent) clazzid).sym.type;
2819 if (annoclazzid != null) {
2820 annoclazzid.type = clazzid.type;
2821 }
2822 if (!clazztype.isErroneous()) {
2823 if (cdef != null && clazztype.tsym.isInterface()) {
2824 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2825 } else if (clazztype.tsym.isStatic()) {
2826 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2827 }
2828 }
2829 } else if (!clazztype.tsym.isInterface() &&
2830 (clazztype.tsym.flags_field & NOOUTERTHIS) == 0 &&
2831 clazztype.getEnclosingType().hasTag(CLASS)) {
2832 // Check for the existence of an apropos outer instance
2833 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2834 }
2835
2836 // Attribute constructor arguments.
2837 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2838 final KindSelector pkind =
2839 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2840 List<Type> argtypes = argtypesBuf.toList();
2841 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2842
2843 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2844 // Enums may not be instantiated except implicitly
2845 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2846 (!env.tree.hasTag(VARDEF) ||
2847 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2848 ((JCVariableDecl) env.tree).init != tree))
2849 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2850
2851 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2852 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2853 boolean skipNonDiamondPath = false;
2854 // Check that class is not abstract
2855 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2856 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2857 log.error(tree.pos(),
2858 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2859 skipNonDiamondPath = true;
2860 } else if (cdef != null && clazztype.tsym.isInterface()) {
2861 // Check that no constructor arguments are given to
2862 // anonymous classes implementing an interface
2863 if (!argtypes.isEmpty())
2864 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2865
2866 if (!typeargtypes.isEmpty())
2867 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2868
2869 // Error recovery: pretend no arguments were supplied.
2870 argtypes = List.nil();
2871 typeargtypes = List.nil();
2872 skipNonDiamondPath = true;
2873 }
2874 if (TreeInfo.isDiamond(tree)) {
2875 ClassType site = new ClassType(clazztype.getEnclosingType(),
2876 clazztype.tsym.type.getTypeArguments(),
2877 clazztype.tsym,
2878 clazztype.getMetadata());
2879
2880 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2881 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2882 diamondEnv.info.pendingResolutionPhase = null;
2883
2884 //if the type of the instance creation expression is a class type
2885 //apply method resolution inference (JLS 15.12.2.7). The return type
2886 //of the resolved constructor will be a partially instantiated type
2887 Symbol constructor = rs.resolveDiamond(tree.pos(),
2888 diamondEnv,
2889 site,
2890 argtypes,
2891 typeargtypes);
2892 tree.constructor = constructor.baseSymbol();
2893
2894 final TypeSymbol csym = clazztype.tsym;
2895 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2896 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2897 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2898 constructorType = checkId(tree, site,
2899 constructor,
2900 diamondEnv,
2901 diamondResult);
2902
2903 tree.clazz.type = types.createErrorType(clazztype);
2904 if (!constructorType.isErroneous()) {
2905 tree.clazz.type = clazz.type = constructorType.getReturnType();
2906 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2907 }
2908 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2909 }
2910
2911 // Resolve the called constructor under the assumption
2912 // that we are referring to a superclass instance of the
2913 // current instance (JLS ???).
2914 else if (!skipNonDiamondPath) {
2915 //the following code alters some of the fields in the current
2916 //AttrContext - hence, the current context must be dup'ed in
2917 //order to avoid downstream failures
2918 Env<AttrContext> rsEnv = localEnv.dup(tree);
2919 rsEnv.info.selectSuper = cdef != null;
2920 rsEnv.info.pendingResolutionPhase = null;
2921 tree.constructor = rs.resolveConstructor(
2922 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2923 if (cdef == null) { //do not check twice!
2924 tree.constructorType = checkId(tree,
2925 clazztype,
2926 tree.constructor,
2927 rsEnv,
2928 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2929 if (rsEnv.info.lastResolveVarargs())
2930 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2931 }
2932 }
2933
2934 if (cdef != null) {
2935 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2936 return;
2937 }
2938
2939 if (tree.constructor != null && tree.constructor.kind == MTH)
2940 owntype = clazztype;
2941 }
2942 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2943 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2944 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2945 //we need to wait for inference to finish and then replace inference vars in the constructor type
2946 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2947 instantiatedContext -> {
2948 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2949 });
2950 }
2951 chk.validate(tree.typeargs, localEnv);
2952 }
2953
2954 // where
2955 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2956 JCClassDecl cdef, Env<AttrContext> localEnv,
2957 List<Type> argtypes, List<Type> typeargtypes,
2958 KindSelector pkind) {
2959 // We are seeing an anonymous class instance creation.
2960 // In this case, the class instance creation
2961 // expression
2962 //
2963 // E.new <typeargs1>C<typargs2>(args) { ... }
2964 //
2965 // is represented internally as
2966 //
2967 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2968 //
2969 // This expression is then *transformed* as follows:
2970 //
2971 // (1) add an extends or implements clause
2972 // (2) add a constructor.
2973 //
2974 // For instance, if C is a class, and ET is the type of E,
2975 // the expression
2976 //
2977 // E.new <typeargs1>C<typargs2>(args) { ... }
2978 //
2979 // is translated to (where X is a fresh name and typarams is the
2980 // parameter list of the super constructor):
2981 //
2982 // new <typeargs1>X(<*nullchk*>E, args) where
2983 // X extends C<typargs2> {
2984 // <typarams> X(ET e, args) {
2985 // e.<typeargs1>super(args)
2986 // }
2987 // ...
2988 // }
2989 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2990 Type enclType = clazztype.getEnclosingType();
2991 if (enclType != null &&
2992 enclType.hasTag(CLASS) &&
2993 !chk.checkDenotable((ClassType)enclType)) {
2994 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2995 }
2996 final boolean isDiamond = TreeInfo.isDiamond(tree);
2997 if (isDiamond
2998 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2999 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3000 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3001 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3002 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3003 instantiatedContext -> {
3004 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3005 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3006 ResultInfo prevResult = this.resultInfo;
3007 try {
3008 this.resultInfo = resultInfoForClassDefinition;
3009 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3010 dupLocalEnv, argtypes, typeargtypes, pkind);
3011 } finally {
3012 this.resultInfo = prevResult;
3013 }
3014 });
3015 } else {
3016 if (isDiamond && clazztype.hasTag(CLASS)) {
3017 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3018 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3019 // One or more types inferred in the previous steps is non-denotable.
3020 Fragment fragment = Diamond(clazztype.tsym);
3021 log.error(tree.clazz.pos(),
3022 Errors.CantApplyDiamond1(
3023 fragment,
3024 invalidDiamondArgs.size() > 1 ?
3025 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3026 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3027 }
3028 // For <>(){}, inferred types must also be accessible.
3029 for (Type t : clazztype.getTypeArguments()) {
3030 rs.checkAccessibleType(env, t);
3031 }
3032 }
3033
3034 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3035 // false for isInterface call even when the original type is an interface.
3036 boolean implementing = clazztype.tsym.isInterface() ||
3037 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3038 clazztype.getOriginalType().tsym.isInterface();
3039
3040 if (implementing) {
3041 cdef.implementing = List.of(clazz);
3042 } else {
3043 cdef.extending = clazz;
3044 }
3045
3046 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3047 rs.isSerializable(clazztype)) {
3048 localEnv.info.isSerializable = true;
3049 }
3050
3051 attribStat(cdef, localEnv);
3052
3053 List<Type> finalargtypes;
3054 // If an outer instance is given,
3055 // prefix it to the constructor arguments
3056 // and delete it from the new expression
3057 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3058 finalargtypes = argtypes.prepend(tree.encl.type);
3059 } else {
3060 finalargtypes = argtypes;
3061 }
3062
3063 // Reassign clazztype and recompute constructor. As this necessarily involves
3064 // another attribution pass for deferred types in the case of <>, replicate
3065 // them. Original arguments have right decorations already.
3066 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3067 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3068 }
3069
3070 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3071 : cdef.sym.type;
3072 Symbol sym = tree.constructor = rs.resolveConstructor(
3073 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3074 Assert.check(!sym.kind.isResolutionError());
3075 tree.constructor = sym;
3076 tree.constructorType = checkId(tree,
3077 clazztype,
3078 tree.constructor,
3079 localEnv,
3080 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3081 }
3082 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3083 clazztype : types.createErrorType(tree.type);
3084 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3085 chk.validate(tree.typeargs, localEnv);
3086 }
3087
3088 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3089 return new Check.NestedCheckContext(checkContext) {
3090 @Override
3091 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3092 enclosingContext.report(clazz.clazz,
3093 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3094 }
3095 };
3096 }
3097
3098 /** Make an attributed null check tree.
3099 */
3100 public JCExpression makeNullCheck(JCExpression arg) {
3101 // optimization: new Outer() can never be null; skip null check
3102 if (arg.getTag() == NEWCLASS)
3103 return arg;
3104 // optimization: X.this is never null; skip null check
3105 Name name = TreeInfo.name(arg);
3106 if (name == names._this || name == names._super) return arg;
3107
3108 JCTree.Tag optag = NULLCHK;
3109 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3110 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3111 tree.type = arg.type;
3112 return tree;
3113 }
3114
3115 public void visitNewArray(JCNewArray tree) {
3116 Type owntype = types.createErrorType(tree.type);
3117 Env<AttrContext> localEnv = env.dup(tree);
3118 Type elemtype;
3119 if (tree.elemtype != null) {
3120 elemtype = attribType(tree.elemtype, localEnv);
3121 chk.validate(tree.elemtype, localEnv);
3122 owntype = elemtype;
3123 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3124 attribExpr(l.head, localEnv, syms.intType);
3125 owntype = new ArrayType(owntype, syms.arrayClass);
3126 }
3127 } else {
3128 // we are seeing an untyped aggregate { ... }
3129 // this is allowed only if the prototype is an array
3130 if (pt().hasTag(ARRAY)) {
3131 elemtype = types.elemtype(pt());
3132 } else {
3133 if (!pt().hasTag(ERROR) &&
3134 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3135 log.error(tree.pos(),
3136 Errors.IllegalInitializerForType(pt()));
3137 }
3138 elemtype = types.createErrorType(pt());
3139 }
3140 }
3141 if (tree.elems != null) {
3142 attribExprs(tree.elems, localEnv, elemtype);
3143 owntype = new ArrayType(elemtype, syms.arrayClass);
3144 }
3145 if (!types.isReifiable(elemtype))
3146 log.error(tree.pos(), Errors.GenericArrayCreation);
3147 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3148 }
3149
3150 /*
3151 * A lambda expression can only be attributed when a target-type is available.
3152 * In addition, if the target-type is that of a functional interface whose
3153 * descriptor contains inference variables in argument position the lambda expression
3154 * is 'stuck' (see DeferredAttr).
3155 */
3156 @Override
3157 public void visitLambda(final JCLambda that) {
3158 boolean wrongContext = false;
3159 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3160 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3161 //lambda only allowed in assignment or method invocation/cast context
3162 log.error(that.pos(), Errors.UnexpectedLambda);
3163 }
3164 resultInfo = recoveryInfo;
3165 wrongContext = true;
3166 }
3167 //create an environment for attribution of the lambda expression
3168 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3169 boolean needsRecovery =
3170 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3171 try {
3172 if (needsRecovery && rs.isSerializable(pt())) {
3173 localEnv.info.isSerializable = true;
3174 localEnv.info.isSerializableLambda = true;
3175 }
3176 List<Type> explicitParamTypes = null;
3177 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3178 //attribute lambda parameters
3179 attribStats(that.params, localEnv);
3180 explicitParamTypes = TreeInfo.types(that.params);
3181 }
3182
3183 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3184 Type currentTarget = targetInfo.target;
3185 Type lambdaType = targetInfo.descriptor;
3186
3187 if (currentTarget.isErroneous()) {
3188 result = that.type = currentTarget;
3189 return;
3190 }
3191
3192 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3193
3194 if (lambdaType.hasTag(FORALL)) {
3195 //lambda expression target desc cannot be a generic method
3196 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3197 kindName(currentTarget.tsym),
3198 currentTarget.tsym);
3199 resultInfo.checkContext.report(that, diags.fragment(msg));
3200 result = that.type = types.createErrorType(pt());
3201 return;
3202 }
3203
3204 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3205 //add param type info in the AST
3206 List<Type> actuals = lambdaType.getParameterTypes();
3207 List<JCVariableDecl> params = that.params;
3208
3209 boolean arityMismatch = false;
3210
3211 while (params.nonEmpty()) {
3212 if (actuals.isEmpty()) {
3213 //not enough actuals to perform lambda parameter inference
3214 arityMismatch = true;
3215 }
3216 //reset previously set info
3217 Type argType = arityMismatch ?
3218 syms.errType :
3219 actuals.head;
3220 if (params.head.isImplicitlyTyped()) {
3221 setSyntheticVariableType(params.head, argType);
3222 }
3223 params.head.sym = null;
3224 actuals = actuals.isEmpty() ?
3225 actuals :
3226 actuals.tail;
3227 params = params.tail;
3228 }
3229
3230 //attribute lambda parameters
3231 attribStats(that.params, localEnv);
3232
3233 if (arityMismatch) {
3234 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3235 result = that.type = types.createErrorType(currentTarget);
3236 return;
3237 }
3238 }
3239
3240 //from this point on, no recovery is needed; if we are in assignment context
3241 //we will be able to attribute the whole lambda body, regardless of errors;
3242 //if we are in a 'check' method context, and the lambda is not compatible
3243 //with the target-type, it will be recovered anyway in Attr.checkId
3244 needsRecovery = false;
3245
3246 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3247 lambdaBodyResult(that, lambdaType, resultInfo);
3248
3249 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3250 attribTree(that.getBody(), localEnv, bodyResultInfo);
3251 } else {
3252 JCBlock body = (JCBlock)that.body;
3253 if (body == breakTree &&
3254 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3255 breakTreeFound(copyEnv(localEnv));
3256 }
3257 attribStats(body.stats, localEnv);
3258 }
3259
3260 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3261
3262 boolean isSpeculativeRound =
3263 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3264
3265 preFlow(that);
3266 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3267
3268 that.type = currentTarget; //avoids recovery at this stage
3269 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3270
3271 if (!isSpeculativeRound) {
3272 //add thrown types as bounds to the thrown types free variables if needed:
3273 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3274 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3275 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3276 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3277 }
3278 }
3279
3280 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3281 }
3282 result = wrongContext ? that.type = types.createErrorType(pt())
3283 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3284 } catch (Types.FunctionDescriptorLookupError ex) {
3285 JCDiagnostic cause = ex.getDiagnostic();
3286 resultInfo.checkContext.report(that, cause);
3287 result = that.type = types.createErrorType(pt());
3288 return;
3289 } catch (CompletionFailure cf) {
3290 chk.completionError(that.pos(), cf);
3291 } catch (Throwable t) {
3292 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3293 //as that would likely cause the same exception again.
3294 needsRecovery = false;
3295 throw t;
3296 } finally {
3297 localEnv.info.scope.leave();
3298 if (needsRecovery) {
3299 Type prevResult = result;
3300 try {
3301 attribTree(that, env, recoveryInfo);
3302 } finally {
3303 if (result == Type.recoveryType) {
3304 result = prevResult;
3305 }
3306 }
3307 }
3308 }
3309 }
3310 //where
3311 class TargetInfo {
3312 Type target;
3313 Type descriptor;
3314
3315 public TargetInfo(Type target, Type descriptor) {
3316 this.target = target;
3317 this.descriptor = descriptor;
3318 }
3319 }
3320
3321 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3322 Type lambdaType;
3323 Type currentTarget = resultInfo.pt;
3324 if (resultInfo.pt != Type.recoveryType) {
3325 /* We need to adjust the target. If the target is an
3326 * intersection type, for example: SAM & I1 & I2 ...
3327 * the target will be updated to SAM
3328 */
3329 currentTarget = targetChecker.visit(currentTarget, that);
3330 if (!currentTarget.isIntersection()) {
3331 if (explicitParamTypes != null) {
3332 currentTarget = infer.instantiateFunctionalInterface(that,
3333 currentTarget, explicitParamTypes, resultInfo.checkContext);
3334 }
3335 currentTarget = types.removeWildcards(currentTarget);
3336 lambdaType = types.findDescriptorType(currentTarget);
3337 } else {
3338 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3339 ListBuffer<Type> components = new ListBuffer<>();
3340 for (Type bound : ict.getExplicitComponents()) {
3341 if (explicitParamTypes != null) {
3342 try {
3343 bound = infer.instantiateFunctionalInterface(that,
3344 bound, explicitParamTypes, resultInfo.checkContext);
3345 } catch (FunctionDescriptorLookupError t) {
3346 // do nothing
3347 }
3348 }
3349 bound = types.removeWildcards(bound);
3350 components.add(bound);
3351 }
3352 currentTarget = types.makeIntersectionType(components.toList());
3353 currentTarget.tsym.flags_field |= INTERFACE;
3354 lambdaType = types.findDescriptorType(currentTarget);
3355 }
3356
3357 } else {
3358 currentTarget = Type.recoveryType;
3359 lambdaType = fallbackDescriptorType(that);
3360 }
3361 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3362 //lambda expression target desc cannot be a generic method
3363 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3364 kindName(currentTarget.tsym),
3365 currentTarget.tsym);
3366 resultInfo.checkContext.report(that, diags.fragment(msg));
3367 currentTarget = types.createErrorType(pt());
3368 }
3369 return new TargetInfo(currentTarget, lambdaType);
3370 }
3371
3372 void preFlow(JCLambda tree) {
3373 attrRecover.doRecovery();
3374 new PostAttrAnalyzer() {
3375 @Override
3376 public void scan(JCTree tree) {
3377 if (tree == null ||
3378 (tree.type != null &&
3379 tree.type == Type.stuckType)) {
3380 //don't touch stuck expressions!
3381 return;
3382 }
3383 super.scan(tree);
3384 }
3385
3386 @Override
3387 public void visitClassDef(JCClassDecl that) {
3388 // or class declaration trees!
3389 }
3390
3391 public void visitLambda(JCLambda that) {
3392 // or lambda expressions!
3393 }
3394 }.scan(tree.body);
3395 }
3396
3397 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3398
3399 @Override
3400 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3401 return t.isIntersection() ?
3402 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3403 }
3404
3405 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3406 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3407 return ict;
3408 }
3409
3410 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3411 ListBuffer<Type> targs = new ListBuffer<>();
3412 ListBuffer<Type> supertypes = new ListBuffer<>();
3413 for (Type i : ict.interfaces_field) {
3414 if (i.isParameterized()) {
3415 targs.appendList(i.tsym.type.allparams());
3416 }
3417 supertypes.append(i.tsym.type);
3418 }
3419 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3420 notionalIntf.allparams_field = targs.toList();
3421 notionalIntf.tsym.flags_field |= INTERFACE;
3422 return notionalIntf.tsym;
3423 }
3424 };
3425
3426 private Type fallbackDescriptorType(JCExpression tree) {
3427 switch (tree.getTag()) {
3428 case LAMBDA:
3429 JCLambda lambda = (JCLambda)tree;
3430 List<Type> argtypes = List.nil();
3431 for (JCVariableDecl param : lambda.params) {
3432 argtypes = param.vartype != null && param.vartype.type != null ?
3433 argtypes.append(param.vartype.type) :
3434 argtypes.append(syms.errType);
3435 }
3436 return new MethodType(argtypes, Type.recoveryType,
3437 List.of(syms.throwableType), syms.methodClass);
3438 case REFERENCE:
3439 return new MethodType(List.nil(), Type.recoveryType,
3440 List.of(syms.throwableType), syms.methodClass);
3441 default:
3442 Assert.error("Cannot get here!");
3443 }
3444 return null;
3445 }
3446
3447 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3448 final InferenceContext inferenceContext, final Type... ts) {
3449 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3450 }
3451
3452 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3453 final InferenceContext inferenceContext, final List<Type> ts) {
3454 if (inferenceContext.free(ts)) {
3455 inferenceContext.addFreeTypeListener(ts,
3456 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3457 } else {
3458 for (Type t : ts) {
3459 rs.checkAccessibleType(env, t);
3460 }
3461 }
3462 }
3463
3464 /**
3465 * Lambda/method reference have a special check context that ensures
3466 * that i.e. a lambda return type is compatible with the expected
3467 * type according to both the inherited context and the assignment
3468 * context.
3469 */
3470 class FunctionalReturnContext extends Check.NestedCheckContext {
3471
3472 FunctionalReturnContext(CheckContext enclosingContext) {
3473 super(enclosingContext);
3474 }
3475
3476 @Override
3477 public boolean compatible(Type found, Type req, Warner warn) {
3478 //return type must be compatible in both current context and assignment context
3479 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3480 }
3481
3482 @Override
3483 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3484 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3485 }
3486 }
3487
3488 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3489
3490 JCExpression expr;
3491 boolean expStmtExpected;
3492
3493 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3494 super(enclosingContext);
3495 this.expr = expr;
3496 }
3497
3498 @Override
3499 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3500 if (expStmtExpected) {
3501 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3502 } else {
3503 super.report(pos, details);
3504 }
3505 }
3506
3507 @Override
3508 public boolean compatible(Type found, Type req, Warner warn) {
3509 //a void return is compatible with an expression statement lambda
3510 if (req.hasTag(VOID)) {
3511 expStmtExpected = true;
3512 return TreeInfo.isExpressionStatement(expr);
3513 } else {
3514 return super.compatible(found, req, warn);
3515 }
3516 }
3517 }
3518
3519 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3520 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3521 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3522 new FunctionalReturnContext(resultInfo.checkContext);
3523
3524 return descriptor.getReturnType() == Type.recoveryType ?
3525 recoveryInfo :
3526 new ResultInfo(KindSelector.VAL,
3527 descriptor.getReturnType(), funcContext);
3528 }
3529
3530 /**
3531 * Lambda compatibility. Check that given return types, thrown types, parameter types
3532 * are compatible with the expected functional interface descriptor. This means that:
3533 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3534 * types must be compatible with the return type of the expected descriptor.
3535 */
3536 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3537 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3538
3539 //return values have already been checked - but if lambda has no return
3540 //values, we must ensure that void/value compatibility is correct;
3541 //this amounts at checking that, if a lambda body can complete normally,
3542 //the descriptor's return type must be void
3543 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3544 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3545 Fragment msg =
3546 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3547 checkContext.report(tree,
3548 diags.fragment(msg));
3549 }
3550
3551 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3552 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3553 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3554 }
3555 }
3556
3557 /* This method returns an environment to be used to attribute a lambda
3558 * expression.
3559 *
3560 * The owner of this environment is a method symbol. If the current owner
3561 * is not a method (e.g. if the lambda occurs in a field initializer), then
3562 * a synthetic method symbol owner is created.
3563 */
3564 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3565 Env<AttrContext> lambdaEnv;
3566 Symbol owner = env.info.scope.owner;
3567 if (owner.kind == VAR && owner.owner.kind == TYP) {
3568 // If the lambda is nested in a field initializer, we need to create a fake init method.
3569 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3570 // init symbol's owner).
3571 ClassSymbol enclClass = owner.enclClass();
3572 Name initName = owner.isStatic() ? names.clinit : names.init;
3573 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3574 initName, initBlockType, enclClass);
3575 initSym.params = List.nil();
3576 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3577 } else {
3578 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3579 }
3580 lambdaEnv.info.yieldResult = null;
3581 lambdaEnv.info.isLambda = true;
3582 return lambdaEnv;
3583 }
3584
3585 @Override
3586 public void visitReference(final JCMemberReference that) {
3587 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3588 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3589 //method reference only allowed in assignment or method invocation/cast context
3590 log.error(that.pos(), Errors.UnexpectedMref);
3591 }
3592 result = that.type = types.createErrorType(pt());
3593 return;
3594 }
3595 final Env<AttrContext> localEnv = env.dup(that);
3596 try {
3597 //attribute member reference qualifier - if this is a constructor
3598 //reference, the expected kind must be a type
3599 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3600
3601 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3602 exprType = chk.checkConstructorRefType(that.expr, exprType);
3603 if (!exprType.isErroneous() &&
3604 exprType.isRaw() &&
3605 that.typeargs != null) {
3606 log.error(that.expr.pos(),
3607 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3608 Fragments.MrefInferAndExplicitParams));
3609 exprType = types.createErrorType(exprType);
3610 }
3611 }
3612
3613 if (exprType.isErroneous()) {
3614 //if the qualifier expression contains problems,
3615 //give up attribution of method reference
3616 result = that.type = exprType;
3617 return;
3618 }
3619
3620 if (TreeInfo.isStaticSelector(that.expr, names)) {
3621 //if the qualifier is a type, validate it; raw warning check is
3622 //omitted as we don't know at this stage as to whether this is a
3623 //raw selector (because of inference)
3624 chk.validate(that.expr, env, false);
3625 } else {
3626 Symbol lhsSym = TreeInfo.symbol(that.expr);
3627 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3628 }
3629 //attrib type-arguments
3630 List<Type> typeargtypes = List.nil();
3631 if (that.typeargs != null) {
3632 typeargtypes = attribTypes(that.typeargs, localEnv);
3633 }
3634
3635 boolean isTargetSerializable =
3636 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3637 rs.isSerializable(pt());
3638 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3639 Type currentTarget = targetInfo.target;
3640 Type desc = targetInfo.descriptor;
3641
3642 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3643 List<Type> argtypes = desc.getParameterTypes();
3644 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3645
3646 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3647 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3648 }
3649
3650 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3651 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3652 try {
3653 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3654 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3655 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3656 } finally {
3657 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3658 }
3659
3660 Symbol refSym = refResult.fst;
3661 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3662
3663 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3664 * JDK-8075541
3665 */
3666 if (refSym.kind != MTH) {
3667 boolean targetError;
3668 switch (refSym.kind) {
3669 case ABSENT_MTH:
3670 case MISSING_ENCL:
3671 targetError = false;
3672 break;
3673 case WRONG_MTH:
3674 case WRONG_MTHS:
3675 case AMBIGUOUS:
3676 case HIDDEN:
3677 case STATICERR:
3678 targetError = true;
3679 break;
3680 default:
3681 Assert.error("unexpected result kind " + refSym.kind);
3682 targetError = false;
3683 }
3684
3685 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3686 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3687 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3688
3689 JCDiagnostic diag = diags.create(log.currentSource(), that,
3690 targetError ?
3691 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3692 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3693
3694 if (targetError && currentTarget == Type.recoveryType) {
3695 //a target error doesn't make sense during recovery stage
3696 //as we don't know what actual parameter types are
3697 result = that.type = currentTarget;
3698 return;
3699 } else {
3700 if (targetError) {
3701 resultInfo.checkContext.report(that, diag);
3702 } else {
3703 log.report(diag);
3704 }
3705 result = that.type = types.createErrorType(currentTarget);
3706 return;
3707 }
3708 }
3709
3710 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3711 that.kind = lookupHelper.referenceKind(that.sym);
3712 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3713
3714 if (desc.getReturnType() == Type.recoveryType) {
3715 // stop here
3716 result = that.type = currentTarget;
3717 return;
3718 }
3719
3720 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3721 Type enclosingType = exprType.getEnclosingType();
3722 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3723 // Check for the existence of an appropriate outer instance
3724 rs.resolveImplicitThis(that.pos(), env, exprType);
3725 }
3726 }
3727
3728 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3729
3730 if (that.getMode() == ReferenceMode.INVOKE &&
3731 TreeInfo.isStaticSelector(that.expr, names) &&
3732 that.kind.isUnbound() &&
3733 lookupHelper.site.isRaw()) {
3734 chk.checkRaw(that.expr, localEnv);
3735 }
3736
3737 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3738 exprType.getTypeArguments().nonEmpty()) {
3739 //static ref with class type-args
3740 log.error(that.expr.pos(),
3741 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3742 Fragments.StaticMrefWithTargs));
3743 result = that.type = types.createErrorType(currentTarget);
3744 return;
3745 }
3746
3747 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3748 // Check that super-qualified symbols are not abstract (JLS)
3749 rs.checkNonAbstract(that.pos(), that.sym);
3750 }
3751
3752 if (isTargetSerializable) {
3753 chk.checkAccessFromSerializableElement(that, true);
3754 }
3755 }
3756
3757 ResultInfo checkInfo =
3758 resultInfo.dup(newMethodTemplate(
3759 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3760 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3761 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3762
3763 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3764
3765 if (that.kind.isUnbound() &&
3766 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3767 //re-generate inference constraints for unbound receiver
3768 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3769 //cannot happen as this has already been checked - we just need
3770 //to regenerate the inference constraints, as that has been lost
3771 //as a result of the call to inferenceContext.save()
3772 Assert.error("Can't get here");
3773 }
3774 }
3775
3776 if (!refType.isErroneous()) {
3777 refType = types.createMethodTypeWithReturn(refType,
3778 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3779 }
3780
3781 //go ahead with standard method reference compatibility check - note that param check
3782 //is a no-op (as this has been taken care during method applicability)
3783 boolean isSpeculativeRound =
3784 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3785
3786 that.type = currentTarget; //avoids recovery at this stage
3787 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3788 if (!isSpeculativeRound) {
3789 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3790 }
3791 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3792 } catch (Types.FunctionDescriptorLookupError ex) {
3793 JCDiagnostic cause = ex.getDiagnostic();
3794 resultInfo.checkContext.report(that, cause);
3795 result = that.type = types.createErrorType(pt());
3796 return;
3797 }
3798 }
3799 //where
3800 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3801 //if this is a constructor reference, the expected kind must be a type
3802 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3803 KindSelector.VAL_TYP : KindSelector.TYP,
3804 Type.noType);
3805 }
3806
3807
3808 @SuppressWarnings("fallthrough")
3809 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3810 InferenceContext inferenceContext = checkContext.inferenceContext();
3811 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3812
3813 Type resType;
3814 switch (tree.getMode()) {
3815 case NEW:
3816 if (!tree.expr.type.isRaw()) {
3817 resType = tree.expr.type;
3818 break;
3819 }
3820 default:
3821 resType = refType.getReturnType();
3822 }
3823
3824 Type incompatibleReturnType = resType;
3825
3826 if (returnType.hasTag(VOID)) {
3827 incompatibleReturnType = null;
3828 }
3829
3830 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3831 if (resType.isErroneous() ||
3832 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3833 checkContext.checkWarner(tree, resType, returnType))) {
3834 incompatibleReturnType = null;
3835 }
3836 }
3837
3838 if (incompatibleReturnType != null) {
3839 Fragment msg =
3840 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3841 checkContext.report(tree, diags.fragment(msg));
3842 } else {
3843 if (inferenceContext.free(refType)) {
3844 // we need to wait for inference to finish and then replace inference vars in the referent type
3845 inferenceContext.addFreeTypeListener(List.of(refType),
3846 instantiatedContext -> {
3847 tree.referentType = instantiatedContext.asInstType(refType);
3848 });
3849 } else {
3850 tree.referentType = refType;
3851 }
3852 }
3853
3854 if (!speculativeAttr) {
3855 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3856 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3857 }
3858 }
3859 }
3860
3861 boolean checkExConstraints(
3862 List<Type> thrownByFuncExpr,
3863 List<Type> thrownAtFuncType,
3864 InferenceContext inferenceContext) {
3865 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3866 * are not proper types
3867 */
3868 List<Type> nonProperList = thrownAtFuncType.stream()
3869 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3870 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3871
3872 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3873 * in the throws clause of the invocation type of the method reference's compile-time
3874 * declaration
3875 */
3876 List<Type> checkedList = thrownByFuncExpr.stream()
3877 .filter(e -> chk.isChecked(e)).collect(List.collector());
3878
3879 /** If n = 0 (the function type's throws clause consists only of proper types), then
3880 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3881 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3882 * reduces to true
3883 */
3884 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3885 for (Type checked : checkedList) {
3886 boolean isSubtype = false;
3887 for (Type proper : properList) {
3888 if (types.isSubtype(checked, proper)) {
3889 isSubtype = true;
3890 break;
3891 }
3892 }
3893 if (!isSubtype) {
3894 uncaughtByProperTypes.add(checked);
3895 }
3896 }
3897
3898 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3899 return false;
3900 }
3901
3902 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3903 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3904 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3905 */
3906 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3907 uncaughtByProperTypes.forEach(checkedEx -> {
3908 nonProperAsUndet.forEach(nonProper -> {
3909 types.isSubtype(checkedEx, nonProper);
3910 });
3911 });
3912
3913 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3914 */
3915 nonProperAsUndet.stream()
3916 .filter(t -> t.hasTag(UNDETVAR))
3917 .forEach(t -> ((UndetVar)t).setThrow());
3918 return true;
3919 }
3920
3921 /**
3922 * Set functional type info on the underlying AST. Note: as the target descriptor
3923 * might contain inference variables, we might need to register an hook in the
3924 * current inference context.
3925 */
3926 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3927 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3928 if (checkContext.inferenceContext().free(descriptorType)) {
3929 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3930 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3931 inferenceContext.asInstType(primaryTarget), checkContext));
3932 } else {
3933 fExpr.owner = env.info.scope.owner;
3934 if (pt.hasTag(CLASS)) {
3935 fExpr.target = primaryTarget;
3936 }
3937 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3938 pt != Type.recoveryType) {
3939 //check that functional interface class is well-formed
3940 try {
3941 /* Types.makeFunctionalInterfaceClass() may throw an exception
3942 * when it's executed post-inference. See the listener code
3943 * above.
3944 */
3945 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3946 names.empty, fExpr.target, ABSTRACT);
3947 if (csym != null) {
3948 chk.checkImplementations(env.tree, csym, csym);
3949 try {
3950 //perform an additional functional interface check on the synthetic class,
3951 //as there may be spurious errors for raw targets - because of existing issues
3952 //with membership and inheritance (see JDK-8074570).
3953 csym.flags_field |= INTERFACE;
3954 types.findDescriptorType(csym.type);
3955 } catch (FunctionDescriptorLookupError err) {
3956 resultInfo.checkContext.report(fExpr,
3957 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3958 }
3959 }
3960 } catch (Types.FunctionDescriptorLookupError ex) {
3961 JCDiagnostic cause = ex.getDiagnostic();
3962 resultInfo.checkContext.report(env.tree, cause);
3963 }
3964 }
3965 }
3966 }
3967
3968 public void visitParens(JCParens tree) {
3969 Type owntype = attribTree(tree.expr, env, resultInfo);
3970 result = check(tree, owntype, pkind(), resultInfo);
3971 Symbol sym = TreeInfo.symbol(tree);
3972 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3973 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3974 }
3975
3976 public void visitAssign(JCAssign tree) {
3977 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3978 Type capturedType = capture(owntype);
3979 attribExpr(tree.rhs, env, owntype);
3980 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3981 }
3982
3983 public void visitAssignop(JCAssignOp tree) {
3984 // Attribute arguments.
3985 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3986 Type operand = attribExpr(tree.rhs, env);
3987 // Find operator.
3988 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3989 if (operator != operators.noOpSymbol &&
3990 !owntype.isErroneous() &&
3991 !operand.isErroneous()) {
3992 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3993 chk.checkCastable(tree.rhs.pos(),
3994 operator.type.getReturnType(),
3995 owntype);
3996 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
3997 }
3998 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3999 }
4000
4001 public void visitUnary(JCUnary tree) {
4002 // Attribute arguments.
4003 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4004 ? attribTree(tree.arg, env, varAssignmentInfo)
4005 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4006
4007 // Find operator.
4008 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4009 Type owntype = types.createErrorType(tree.type);
4010 if (operator != operators.noOpSymbol &&
4011 !argtype.isErroneous()) {
4012 owntype = (tree.getTag().isIncOrDecUnaryOp())
4013 ? tree.arg.type
4014 : operator.type.getReturnType();
4015 int opc = operator.opcode;
4016
4017 // If the argument is constant, fold it.
4018 if (argtype.constValue() != null) {
4019 Type ctype = cfolder.fold1(opc, argtype);
4020 if (ctype != null) {
4021 owntype = cfolder.coerce(ctype, owntype);
4022 }
4023 }
4024 }
4025 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4026 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4027 }
4028
4029 public void visitBinary(JCBinary tree) {
4030 // Attribute arguments.
4031 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4032 // x && y
4033 // include x's bindings when true in y
4034
4035 // x || y
4036 // include x's bindings when false in y
4037
4038 MatchBindings lhsBindings = matchBindings;
4039 List<BindingSymbol> propagatedBindings;
4040 switch (tree.getTag()) {
4041 case AND:
4042 propagatedBindings = lhsBindings.bindingsWhenTrue;
4043 break;
4044 case OR:
4045 propagatedBindings = lhsBindings.bindingsWhenFalse;
4046 break;
4047 default:
4048 propagatedBindings = List.nil();
4049 break;
4050 }
4051 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4052 Type right;
4053 try {
4054 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4055 } finally {
4056 rhsEnv.info.scope.leave();
4057 }
4058
4059 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4060
4061 // Find operator.
4062 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4063 Type owntype = types.createErrorType(tree.type);
4064 if (operator != operators.noOpSymbol &&
4065 !left.isErroneous() &&
4066 !right.isErroneous()) {
4067 owntype = operator.type.getReturnType();
4068 int opc = operator.opcode;
4069 // If both arguments are constants, fold them.
4070 if (left.constValue() != null && right.constValue() != null) {
4071 Type ctype = cfolder.fold2(opc, left, right);
4072 if (ctype != null) {
4073 owntype = cfolder.coerce(ctype, owntype);
4074 }
4075 }
4076
4077 // Check that argument types of a reference ==, != are
4078 // castable to each other, (JLS 15.21). Note: unboxing
4079 // comparisons will not have an acmp* opc at this point.
4080 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4081 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4082 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4083 }
4084 }
4085
4086 chk.checkDivZero(tree.rhs.pos(), operator, right);
4087 }
4088 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4089 }
4090
4091 public void visitTypeCast(final JCTypeCast tree) {
4092 Type clazztype = attribType(tree.clazz, env);
4093 chk.validate(tree.clazz, env, false);
4094 //a fresh environment is required for 292 inference to work properly ---
4095 //see Infer.instantiatePolymorphicSignatureInstance()
4096 Env<AttrContext> localEnv = env.dup(tree);
4097 //should we propagate the target type?
4098 final ResultInfo castInfo;
4099 JCExpression expr = TreeInfo.skipParens(tree.expr);
4100 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4101 if (isPoly) {
4102 //expression is a poly - we need to propagate target type info
4103 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4104 new Check.NestedCheckContext(resultInfo.checkContext) {
4105 @Override
4106 public boolean compatible(Type found, Type req, Warner warn) {
4107 return types.isCastable(found, req, warn);
4108 }
4109 });
4110 } else {
4111 //standalone cast - target-type info is not propagated
4112 castInfo = unknownExprInfo;
4113 }
4114 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4115 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4116 if (exprtype.constValue() != null)
4117 owntype = cfolder.coerce(exprtype, owntype);
4118 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4119 if (!isPoly)
4120 chk.checkRedundantCast(localEnv, tree);
4121 }
4122
4123 public void visitTypeTest(JCInstanceOf tree) {
4124 Type exprtype = attribExpr(tree.expr, env);
4125 if (exprtype.isPrimitive()) {
4126 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4127 } else {
4128 exprtype = chk.checkNullOrRefType(
4129 tree.expr.pos(), exprtype);
4130 }
4131 Type clazztype;
4132 JCTree typeTree;
4133 if (tree.pattern.getTag() == BINDINGPATTERN ||
4134 tree.pattern.getTag() == RECORDPATTERN) {
4135 attribExpr(tree.pattern, env, exprtype);
4136 clazztype = tree.pattern.type;
4137 if (types.isSubtype(exprtype, clazztype) &&
4138 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4139 tree.pattern.getTag() != RECORDPATTERN) {
4140 if (!allowUnconditionalPatternsInstanceOf) {
4141 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4142 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4143 }
4144 }
4145 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4146 } else {
4147 clazztype = attribType(tree.pattern, env);
4148 typeTree = tree.pattern;
4149 chk.validate(typeTree, env, false);
4150 }
4151 if (clazztype.isPrimitive()) {
4152 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4153 } else {
4154 if (!clazztype.hasTag(TYPEVAR)) {
4155 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4156 }
4157 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4158 boolean valid = false;
4159 if (allowReifiableTypesInInstanceof) {
4160 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4161 } else {
4162 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4163 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4164 allowReifiableTypesInInstanceof = true;
4165 }
4166 if (!valid) {
4167 clazztype = types.createErrorType(clazztype);
4168 }
4169 }
4170 }
4171 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4172 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4173 }
4174
4175 private boolean checkCastablePattern(DiagnosticPosition pos,
4176 Type exprType,
4177 Type pattType) {
4178 Warner warner = new Warner();
4179 // if any type is erroneous, the problem is reported elsewhere
4180 if (exprType.isErroneous() || pattType.isErroneous()) {
4181 return false;
4182 }
4183 if (!types.isCastable(exprType, pattType, warner)) {
4184 chk.basicHandler.report(pos,
4185 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4186 return false;
4187 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4188 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4189 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4190 return true;
4191 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4192 log.error(pos,
4193 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4194 return false;
4195 } else {
4196 return true;
4197 }
4198 }
4199
4200 @Override
4201 public void visitAnyPattern(JCAnyPattern tree) {
4202 result = tree.type = resultInfo.pt;
4203 }
4204
4205 public void visitBindingPattern(JCBindingPattern tree) {
4206 Type type;
4207 if (tree.var.vartype != null) {
4208 type = attribType(tree.var.vartype, env);
4209 } else {
4210 type = resultInfo.pt;
4211 }
4212 tree.type = tree.var.type = type;
4213 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4214 v.pos = tree.pos;
4215 tree.var.sym = v;
4216 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4217 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4218 }
4219 if (tree.var.isImplicitlyTyped()) {
4220 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4221 : type);
4222 }
4223 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4224 if (!tree.var.isImplicitlyTyped()) {
4225 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4226 }
4227 annotate.flush();
4228 chk.validate(tree.var.vartype, env, true);
4229 result = tree.type;
4230 if (v.isUnnamedVariable()) {
4231 matchBindings = MatchBindingsComputer.EMPTY;
4232 } else {
4233 matchBindings = new MatchBindings(List.of(v), List.nil());
4234 }
4235 }
4236
4237 @Override
4238 public void visitRecordPattern(JCRecordPattern tree) {
4239 Type site;
4240
4241 if (tree.deconstructor == null) {
4242 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4243 tree.record = syms.errSymbol;
4244 site = tree.type = types.createErrorType(tree.record.type);
4245 } else {
4246 Type type = attribType(tree.deconstructor, env);
4247 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4248 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4249 if (inferred == null) {
4250 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4251 } else {
4252 type = inferred;
4253 }
4254 }
4255 tree.type = tree.deconstructor.type = type;
4256 site = types.capture(tree.type);
4257 }
4258
4259 List<Type> expectedRecordTypes;
4260 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4261 ClassSymbol record = (ClassSymbol) site.tsym;
4262 expectedRecordTypes = record.getRecordComponents()
4263 .stream()
4264 .map(rc -> types.memberType(site, rc))
4265 .map(t -> types.upward(t, types.captures(t)).baseType())
4266 .collect(List.collector());
4267 tree.record = record;
4268 } else {
4269 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4270 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4271 .limit(tree.nested.size())
4272 .collect(List.collector());
4273 tree.record = syms.errSymbol;
4274 }
4275 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4276 List<Type> recordTypes = expectedRecordTypes;
4277 List<JCPattern> nestedPatterns = tree.nested;
4278 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4279 try {
4280 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4281 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4282 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4283 outBindings.addAll(matchBindings.bindingsWhenTrue);
4284 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4285 nestedPatterns = nestedPatterns.tail;
4286 recordTypes = recordTypes.tail;
4287 }
4288 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4289 while (nestedPatterns.nonEmpty()) {
4290 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4291 nestedPatterns = nestedPatterns.tail;
4292 }
4293 List<Type> nestedTypes =
4294 tree.nested.stream().map(p -> p.type).collect(List.collector());
4295 log.error(tree.pos(),
4296 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4297 nestedTypes));
4298 }
4299 } finally {
4300 localEnv.info.scope.leave();
4301 }
4302 chk.validate(tree.deconstructor, env, true);
4303 result = tree.type;
4304 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4305 }
4306
4307 public void visitIndexed(JCArrayAccess tree) {
4308 Type owntype = types.createErrorType(tree.type);
4309 Type atype = attribExpr(tree.indexed, env);
4310 attribExpr(tree.index, env, syms.intType);
4311 if (types.isArray(atype))
4312 owntype = types.elemtype(atype);
4313 else if (!atype.hasTag(ERROR))
4314 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4315 if (!pkind().contains(KindSelector.VAL))
4316 owntype = capture(owntype);
4317 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4318 }
4319
4320 public void visitIdent(JCIdent tree) {
4321 Symbol sym;
4322
4323 // Find symbol
4324 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4325 // If we are looking for a method, the prototype `pt' will be a
4326 // method type with the type of the call's arguments as parameters.
4327 env.info.pendingResolutionPhase = null;
4328 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4329 } else if (tree.sym != null && tree.sym.kind != VAR) {
4330 sym = tree.sym;
4331 } else {
4332 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4333 }
4334 tree.sym = sym;
4335
4336 // Also find the environment current for the class where
4337 // sym is defined (`symEnv').
4338 Env<AttrContext> symEnv = env;
4339 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4340 sym.kind.matches(KindSelector.VAL_MTH) &&
4341 sym.owner.kind == TYP &&
4342 tree.name != names._this && tree.name != names._super) {
4343
4344 // Find environment in which identifier is defined.
4345 while (symEnv.outer != null &&
4346 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4347 symEnv = symEnv.outer;
4348 }
4349 }
4350
4351 // If symbol is a variable, ...
4352 if (sym.kind == VAR) {
4353 VarSymbol v = (VarSymbol)sym;
4354
4355 // ..., evaluate its initializer, if it has one, and check for
4356 // illegal forward reference.
4357 checkInit(tree, env, v, false);
4358
4359 // If we are expecting a variable (as opposed to a value), check
4360 // that the variable is assignable in the current environment.
4361 if (KindSelector.ASG.subset(pkind()))
4362 checkAssignable(tree.pos(), v, null, env);
4363 }
4364
4365 Env<AttrContext> env1 = env;
4366 if (sym.kind != ERR && sym.kind != TYP &&
4367 sym.owner != null && sym.owner != env1.enclClass.sym) {
4368 // If the found symbol is inaccessible, then it is
4369 // accessed through an enclosing instance. Locate this
4370 // enclosing instance:
4371 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4372 env1 = env1.outer;
4373 }
4374
4375 if (env.info.isSerializable) {
4376 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4377 }
4378
4379 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4380 }
4381
4382 public void visitSelect(JCFieldAccess tree) {
4383 // Determine the expected kind of the qualifier expression.
4384 KindSelector skind = KindSelector.NIL;
4385 if (tree.name == names._this || tree.name == names._super ||
4386 tree.name == names._class)
4387 {
4388 skind = KindSelector.TYP;
4389 } else {
4390 if (pkind().contains(KindSelector.PCK))
4391 skind = KindSelector.of(skind, KindSelector.PCK);
4392 if (pkind().contains(KindSelector.TYP))
4393 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4394 if (pkind().contains(KindSelector.VAL_MTH))
4395 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4396 }
4397
4398 // Attribute the qualifier expression, and determine its symbol (if any).
4399 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4400 Assert.check(site == tree.selected.type);
4401 if (!pkind().contains(KindSelector.TYP_PCK))
4402 site = capture(site); // Capture field access
4403
4404 // don't allow T.class T[].class, etc
4405 if (skind == KindSelector.TYP) {
4406 Type elt = site;
4407 while (elt.hasTag(ARRAY))
4408 elt = ((ArrayType)elt).elemtype;
4409 if (elt.hasTag(TYPEVAR)) {
4410 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4411 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4412 tree.sym = tree.type.tsym;
4413 return ;
4414 }
4415 }
4416
4417 // If qualifier symbol is a type or `super', assert `selectSuper'
4418 // for the selection. This is relevant for determining whether
4419 // protected symbols are accessible.
4420 Symbol sitesym = TreeInfo.symbol(tree.selected);
4421 boolean selectSuperPrev = env.info.selectSuper;
4422 env.info.selectSuper =
4423 sitesym != null &&
4424 sitesym.name == names._super;
4425
4426 // Determine the symbol represented by the selection.
4427 env.info.pendingResolutionPhase = null;
4428 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4429 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4430 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4431 sym = syms.errSymbol;
4432 }
4433 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4434 site = capture(site);
4435 sym = selectSym(tree, sitesym, site, env, resultInfo);
4436 }
4437 boolean varArgs = env.info.lastResolveVarargs();
4438 tree.sym = sym;
4439
4440 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4441 site = types.skipTypeVars(site, true);
4442 }
4443
4444 // If that symbol is a variable, ...
4445 if (sym.kind == VAR) {
4446 VarSymbol v = (VarSymbol)sym;
4447
4448 // ..., evaluate its initializer, if it has one, and check for
4449 // illegal forward reference.
4450 checkInit(tree, env, v, true);
4451
4452 // If we are expecting a variable (as opposed to a value), check
4453 // that the variable is assignable in the current environment.
4454 if (KindSelector.ASG.subset(pkind()))
4455 checkAssignable(tree.pos(), v, tree.selected, env);
4456 }
4457
4458 if (sitesym != null &&
4459 sitesym.kind == VAR &&
4460 ((VarSymbol)sitesym).isResourceVariable() &&
4461 sym.kind == MTH &&
4462 sym.name.equals(names.close) &&
4463 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4464 env.info.lint.isEnabled(LintCategory.TRY)) {
4465 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4466 }
4467
4468 // Disallow selecting a type from an expression
4469 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4470 tree.type = check(tree.selected, pt(),
4471 sitesym == null ?
4472 KindSelector.VAL : sitesym.kind.toSelector(),
4473 new ResultInfo(KindSelector.TYP_PCK, pt()));
4474 }
4475
4476 if (isType(sitesym)) {
4477 if (sym.name != names._this && sym.name != names._super) {
4478 // Check if type-qualified fields or methods are static (JLS)
4479 if ((sym.flags() & STATIC) == 0 &&
4480 sym.name != names._super &&
4481 (sym.kind == VAR || sym.kind == MTH)) {
4482 rs.accessBase(rs.new StaticError(sym),
4483 tree.pos(), site, sym.name, true);
4484 }
4485 }
4486 } else if (sym.kind != ERR &&
4487 (sym.flags() & STATIC) != 0 &&
4488 sym.name != names._class) {
4489 // If the qualified item is not a type and the selected item is static, report
4490 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4491 if (!sym.owner.isAnonymous()) {
4492 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4493 } else {
4494 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4495 }
4496 }
4497
4498 // If we are selecting an instance member via a `super', ...
4499 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4500
4501 // Check that super-qualified symbols are not abstract (JLS)
4502 rs.checkNonAbstract(tree.pos(), sym);
4503
4504 if (site.isRaw()) {
4505 // Determine argument types for site.
4506 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4507 if (site1 != null) site = site1;
4508 }
4509 }
4510
4511 if (env.info.isSerializable) {
4512 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4513 }
4514
4515 env.info.selectSuper = selectSuperPrev;
4516 result = checkId(tree, site, sym, env, resultInfo);
4517 }
4518 //where
4519 /** Determine symbol referenced by a Select expression,
4520 *
4521 * @param tree The select tree.
4522 * @param site The type of the selected expression,
4523 * @param env The current environment.
4524 * @param resultInfo The current result.
4525 */
4526 private Symbol selectSym(JCFieldAccess tree,
4527 Symbol location,
4528 Type site,
4529 Env<AttrContext> env,
4530 ResultInfo resultInfo) {
4531 DiagnosticPosition pos = tree.pos();
4532 Name name = tree.name;
4533 switch (site.getTag()) {
4534 case PACKAGE:
4535 return rs.accessBase(
4536 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4537 pos, location, site, name, true);
4538 case ARRAY:
4539 case CLASS:
4540 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4541 return rs.resolveQualifiedMethod(
4542 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4543 } else if (name == names._this || name == names._super) {
4544 return rs.resolveSelf(pos, env, site.tsym, name);
4545 } else if (name == names._class) {
4546 // In this case, we have already made sure in
4547 // visitSelect that qualifier expression is a type.
4548 return syms.getClassField(site, types);
4549 } else {
4550 // We are seeing a plain identifier as selector.
4551 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4552 sym = rs.accessBase(sym, pos, location, site, name, true);
4553 return sym;
4554 }
4555 case WILDCARD:
4556 throw new AssertionError(tree);
4557 case TYPEVAR:
4558 // Normally, site.getUpperBound() shouldn't be null.
4559 // It should only happen during memberEnter/attribBase
4560 // when determining the supertype which *must* be
4561 // done before attributing the type variables. In
4562 // other words, we are seeing this illegal program:
4563 // class B<T> extends A<T.foo> {}
4564 Symbol sym = (site.getUpperBound() != null)
4565 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4566 : null;
4567 if (sym == null) {
4568 log.error(pos, Errors.TypeVarCantBeDeref);
4569 return syms.errSymbol;
4570 } else {
4571 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4572 rs.new AccessError(env, site, sym) :
4573 sym;
4574 rs.accessBase(sym2, pos, location, site, name, true);
4575 return sym;
4576 }
4577 case ERROR:
4578 // preserve identifier names through errors
4579 return types.createErrorType(name, site.tsym, site).tsym;
4580 default:
4581 // The qualifier expression is of a primitive type -- only
4582 // .class is allowed for these.
4583 if (name == names._class) {
4584 // In this case, we have already made sure in Select that
4585 // qualifier expression is a type.
4586 return syms.getClassField(site, types);
4587 } else {
4588 log.error(pos, Errors.CantDeref(site));
4589 return syms.errSymbol;
4590 }
4591 }
4592 }
4593
4594 /** Determine type of identifier or select expression and check that
4595 * (1) the referenced symbol is not deprecated
4596 * (2) the symbol's type is safe (@see checkSafe)
4597 * (3) if symbol is a variable, check that its type and kind are
4598 * compatible with the prototype and protokind.
4599 * (4) if symbol is an instance field of a raw type,
4600 * which is being assigned to, issue an unchecked warning if its
4601 * type changes under erasure.
4602 * (5) if symbol is an instance method of a raw type, issue an
4603 * unchecked warning if its argument types change under erasure.
4604 * If checks succeed:
4605 * If symbol is a constant, return its constant type
4606 * else if symbol is a method, return its result type
4607 * otherwise return its type.
4608 * Otherwise return errType.
4609 *
4610 * @param tree The syntax tree representing the identifier
4611 * @param site If this is a select, the type of the selected
4612 * expression, otherwise the type of the current class.
4613 * @param sym The symbol representing the identifier.
4614 * @param env The current environment.
4615 * @param resultInfo The expected result
4616 */
4617 Type checkId(JCTree tree,
4618 Type site,
4619 Symbol sym,
4620 Env<AttrContext> env,
4621 ResultInfo resultInfo) {
4622 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4623 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4624 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4625 }
4626
4627 Type checkMethodIdInternal(JCTree tree,
4628 Type site,
4629 Symbol sym,
4630 Env<AttrContext> env,
4631 ResultInfo resultInfo) {
4632 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4633 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4634 } else {
4635 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4636 }
4637 }
4638
4639 Type checkIdInternal(JCTree tree,
4640 Type site,
4641 Symbol sym,
4642 Type pt,
4643 Env<AttrContext> env,
4644 ResultInfo resultInfo) {
4645 Type owntype; // The computed type of this identifier occurrence.
4646 switch (sym.kind) {
4647 case TYP:
4648 // For types, the computed type equals the symbol's type,
4649 // except for two situations:
4650 owntype = sym.type;
4651 if (owntype.hasTag(CLASS)) {
4652 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4653 Type ownOuter = owntype.getEnclosingType();
4654
4655 // (a) If the symbol's type is parameterized, erase it
4656 // because no type parameters were given.
4657 // We recover generic outer type later in visitTypeApply.
4658 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4659 owntype = types.erasure(owntype);
4660 }
4661
4662 // (b) If the symbol's type is an inner class, then
4663 // we have to interpret its outer type as a superclass
4664 // of the site type. Example:
4665 //
4666 // class Tree<A> { class Visitor { ... } }
4667 // class PointTree extends Tree<Point> { ... }
4668 // ...PointTree.Visitor...
4669 //
4670 // Then the type of the last expression above is
4671 // Tree<Point>.Visitor.
4672 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4673 Type normOuter = site;
4674 if (normOuter.hasTag(CLASS)) {
4675 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4676 }
4677 if (normOuter == null) // perhaps from an import
4678 normOuter = types.erasure(ownOuter);
4679 if (normOuter != ownOuter)
4680 owntype = new ClassType(
4681 normOuter, List.nil(), owntype.tsym,
4682 owntype.getMetadata());
4683 }
4684 }
4685 break;
4686 case VAR:
4687 VarSymbol v = (VarSymbol)sym;
4688
4689 if (env.info.enclVar != null
4690 && v.type.hasTag(NONE)) {
4691 //self reference to implicitly typed variable declaration
4692 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4693 return tree.type = v.type = types.createErrorType(v.type);
4694 }
4695
4696 // Test (4): if symbol is an instance field of a raw type,
4697 // which is being assigned to, issue an unchecked warning if
4698 // its type changes under erasure.
4699 if (KindSelector.ASG.subset(pkind()) &&
4700 v.owner.kind == TYP &&
4701 (v.flags() & STATIC) == 0 &&
4702 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4703 Type s = types.asOuterSuper(site, v.owner);
4704 if (s != null &&
4705 s.isRaw() &&
4706 !types.isSameType(v.type, v.erasure(types))) {
4707 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4708 }
4709 }
4710 // The computed type of a variable is the type of the
4711 // variable symbol, taken as a member of the site type.
4712 owntype = (sym.owner.kind == TYP &&
4713 sym.name != names._this && sym.name != names._super)
4714 ? types.memberType(site, sym)
4715 : sym.type;
4716
4717 // If the variable is a constant, record constant value in
4718 // computed type.
4719 if (v.getConstValue() != null && isStaticReference(tree))
4720 owntype = owntype.constType(v.getConstValue());
4721
4722 if (resultInfo.pkind == KindSelector.VAL) {
4723 owntype = capture(owntype); // capture "names as expressions"
4724 }
4725 break;
4726 case MTH: {
4727 owntype = checkMethod(site, sym,
4728 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4729 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4730 resultInfo.pt.getTypeArguments());
4731 chk.checkRestricted(tree.pos(), sym);
4732 break;
4733 }
4734 case PCK: case ERR:
4735 owntype = sym.type;
4736 break;
4737 default:
4738 throw new AssertionError("unexpected kind: " + sym.kind +
4739 " in tree " + tree);
4740 }
4741
4742 // Emit a `deprecation' warning if symbol is deprecated.
4743 // (for constructors (but not for constructor references), the error
4744 // was given when the constructor was resolved)
4745
4746 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4747 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4748 chk.checkSunAPI(tree.pos(), sym);
4749 chk.checkProfile(tree.pos(), sym);
4750 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4751 }
4752
4753 if (pt.isErroneous()) {
4754 owntype = types.createErrorType(owntype);
4755 }
4756
4757 // If symbol is a variable, check that its type and
4758 // kind are compatible with the prototype and protokind.
4759 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4760 }
4761
4762 /** Check that variable is initialized and evaluate the variable's
4763 * initializer, if not yet done. Also check that variable is not
4764 * referenced before it is defined.
4765 * @param tree The tree making up the variable reference.
4766 * @param env The current environment.
4767 * @param v The variable's symbol.
4768 */
4769 private void checkInit(JCTree tree,
4770 Env<AttrContext> env,
4771 VarSymbol v,
4772 boolean onlyWarning) {
4773 // A forward reference is diagnosed if the declaration position
4774 // of the variable is greater than the current tree position
4775 // and the tree and variable definition occur in the same class
4776 // definition. Note that writes don't count as references.
4777 // This check applies only to class and instance
4778 // variables. Local variables follow different scope rules,
4779 // and are subject to definite assignment checking.
4780 Env<AttrContext> initEnv = enclosingInitEnv(env);
4781 if (initEnv != null &&
4782 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4783 v.owner.kind == TYP &&
4784 v.owner == env.info.scope.owner.enclClass() &&
4785 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4786 (!env.tree.hasTag(ASSIGN) ||
4787 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4788 if (!onlyWarning || isStaticEnumField(v)) {
4789 Error errkey = (initEnv.info.enclVar == v) ?
4790 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4791 log.error(tree.pos(), errkey);
4792 } else if (useBeforeDeclarationWarning) {
4793 Warning warnkey = (initEnv.info.enclVar == v) ?
4794 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4795 log.warning(tree.pos(), warnkey);
4796 }
4797 }
4798
4799 v.getConstValue(); // ensure initializer is evaluated
4800
4801 checkEnumInitializer(tree, env, v);
4802 }
4803
4804 /**
4805 * Returns the enclosing init environment associated with this env (if any). An init env
4806 * can be either a field declaration env or a static/instance initializer env.
4807 */
4808 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4809 while (true) {
4810 switch (env.tree.getTag()) {
4811 case VARDEF:
4812 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4813 if (vdecl.sym.owner.kind == TYP) {
4814 //field
4815 return env;
4816 }
4817 break;
4818 case BLOCK:
4819 if (env.next.tree.hasTag(CLASSDEF)) {
4820 //instance/static initializer
4821 return env;
4822 }
4823 break;
4824 case METHODDEF:
4825 case CLASSDEF:
4826 case TOPLEVEL:
4827 return null;
4828 }
4829 Assert.checkNonNull(env.next);
4830 env = env.next;
4831 }
4832 }
4833
4834 /**
4835 * Check for illegal references to static members of enum. In
4836 * an enum type, constructors and initializers may not
4837 * reference its static members unless they are constant.
4838 *
4839 * @param tree The tree making up the variable reference.
4840 * @param env The current environment.
4841 * @param v The variable's symbol.
4842 * @jls 8.9 Enum Types
4843 */
4844 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4845 // JLS:
4846 //
4847 // "It is a compile-time error to reference a static field
4848 // of an enum type that is not a compile-time constant
4849 // (15.28) from constructors, instance initializer blocks,
4850 // or instance variable initializer expressions of that
4851 // type. It is a compile-time error for the constructors,
4852 // instance initializer blocks, or instance variable
4853 // initializer expressions of an enum constant e to refer
4854 // to itself or to an enum constant of the same type that
4855 // is declared to the right of e."
4856 if (isStaticEnumField(v)) {
4857 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4858
4859 if (enclClass == null || enclClass.owner == null)
4860 return;
4861
4862 // See if the enclosing class is the enum (or a
4863 // subclass thereof) declaring v. If not, this
4864 // reference is OK.
4865 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4866 return;
4867
4868 // If the reference isn't from an initializer, then
4869 // the reference is OK.
4870 if (!Resolve.isInitializer(env))
4871 return;
4872
4873 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4874 }
4875 }
4876
4877 /** Is the given symbol a static, non-constant field of an Enum?
4878 * Note: enum literals should not be regarded as such
4879 */
4880 private boolean isStaticEnumField(VarSymbol v) {
4881 return Flags.isEnum(v.owner) &&
4882 Flags.isStatic(v) &&
4883 !Flags.isConstant(v) &&
4884 v.name != names._class;
4885 }
4886
4887 /**
4888 * Check that method arguments conform to its instantiation.
4889 **/
4890 public Type checkMethod(Type site,
4891 final Symbol sym,
4892 ResultInfo resultInfo,
4893 Env<AttrContext> env,
4894 final List<JCExpression> argtrees,
4895 List<Type> argtypes,
4896 List<Type> typeargtypes) {
4897 // Test (5): if symbol is an instance method of a raw type, issue
4898 // an unchecked warning if its argument types change under erasure.
4899 if ((sym.flags() & STATIC) == 0 &&
4900 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4901 Type s = types.asOuterSuper(site, sym.owner);
4902 if (s != null && s.isRaw() &&
4903 !types.isSameTypes(sym.type.getParameterTypes(),
4904 sym.erasure(types).getParameterTypes())) {
4905 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4906 }
4907 }
4908
4909 if (env.info.defaultSuperCallSite != null) {
4910 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4911 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4912 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4913 List<MethodSymbol> icand_sup =
4914 types.interfaceCandidates(sup, (MethodSymbol)sym);
4915 if (icand_sup.nonEmpty() &&
4916 icand_sup.head != sym &&
4917 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4918 log.error(env.tree.pos(),
4919 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4920 break;
4921 }
4922 }
4923 env.info.defaultSuperCallSite = null;
4924 }
4925
4926 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4927 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4928 if (app.meth.hasTag(SELECT) &&
4929 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4930 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4931 }
4932 }
4933
4934 // Compute the identifier's instantiated type.
4935 // For methods, we need to compute the instance type by
4936 // Resolve.instantiate from the symbol's type as well as
4937 // any type arguments and value arguments.
4938 Warner noteWarner = new Warner();
4939 try {
4940 Type owntype = rs.checkMethod(
4941 env,
4942 site,
4943 sym,
4944 resultInfo,
4945 argtypes,
4946 typeargtypes,
4947 noteWarner);
4948
4949 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4950 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4951
4952 argtypes = argtypes.map(checkDeferredMap);
4953
4954 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4955 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4956 sym.name,
4957 rs.methodArguments(sym.type.getParameterTypes()),
4958 rs.methodArguments(argtypes.map(checkDeferredMap)),
4959 kindName(sym.location()),
4960 sym.location()));
4961 if (resultInfo.pt != Infer.anyPoly ||
4962 !owntype.hasTag(METHOD) ||
4963 !owntype.isPartial()) {
4964 //if this is not a partially inferred method type, erase return type. Otherwise,
4965 //erasure is carried out in PartiallyInferredMethodType.check().
4966 owntype = new MethodType(owntype.getParameterTypes(),
4967 types.erasure(owntype.getReturnType()),
4968 types.erasure(owntype.getThrownTypes()),
4969 syms.methodClass);
4970 }
4971 }
4972
4973 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4974 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4975 PolyKind.POLY : PolyKind.STANDALONE;
4976 TreeInfo.setPolyKind(env.tree, pkind);
4977
4978 return (resultInfo.pt == Infer.anyPoly) ?
4979 owntype :
4980 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4981 resultInfo.checkContext.inferenceContext());
4982 } catch (Infer.InferenceException ex) {
4983 //invalid target type - propagate exception outwards or report error
4984 //depending on the current check context
4985 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4986 return types.createErrorType(site);
4987 } catch (Resolve.InapplicableMethodException ex) {
4988 final JCDiagnostic diag = ex.getDiagnostic();
4989 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4990 @Override
4991 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4992 return new Pair<>(sym, diag);
4993 }
4994 };
4995 List<Type> argtypes2 = argtypes.map(
4996 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4997 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4998 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4999 log.report(errDiag);
5000 return types.createErrorType(site);
5001 }
5002 }
5003
5004 public void visitLiteral(JCLiteral tree) {
5005 result = check(tree, litType(tree.typetag).constType(tree.value),
5006 KindSelector.VAL, resultInfo);
5007 }
5008 //where
5009 /** Return the type of a literal with given type tag.
5010 */
5011 Type litType(TypeTag tag) {
5012 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5013 }
5014
5015 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5016 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5017 }
5018
5019 public void visitTypeArray(JCArrayTypeTree tree) {
5020 Type etype = attribType(tree.elemtype, env);
5021 Type type = new ArrayType(etype, syms.arrayClass);
5022 result = check(tree, type, KindSelector.TYP, resultInfo);
5023 }
5024
5025 /** Visitor method for parameterized types.
5026 * Bound checking is left until later, since types are attributed
5027 * before supertype structure is completely known
5028 */
5029 public void visitTypeApply(JCTypeApply tree) {
5030 Type owntype = types.createErrorType(tree.type);
5031
5032 // Attribute functor part of application and make sure it's a class.
5033 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5034
5035 // Attribute type parameters
5036 List<Type> actuals = attribTypes(tree.arguments, env);
5037
5038 if (clazztype.hasTag(CLASS)) {
5039 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5040 if (actuals.isEmpty()) //diamond
5041 actuals = formals;
5042
5043 if (actuals.length() == formals.length()) {
5044 List<Type> a = actuals;
5045 List<Type> f = formals;
5046 while (a.nonEmpty()) {
5047 a.head = a.head.withTypeVar(f.head);
5048 a = a.tail;
5049 f = f.tail;
5050 }
5051 // Compute the proper generic outer
5052 Type clazzOuter = clazztype.getEnclosingType();
5053 if (clazzOuter.hasTag(CLASS)) {
5054 Type site;
5055 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5056 if (clazz.hasTag(IDENT)) {
5057 site = env.enclClass.sym.type;
5058 } else if (clazz.hasTag(SELECT)) {
5059 site = ((JCFieldAccess) clazz).selected.type;
5060 } else throw new AssertionError(""+tree);
5061 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5062 if (site.hasTag(CLASS))
5063 site = types.asOuterSuper(site, clazzOuter.tsym);
5064 if (site == null)
5065 site = types.erasure(clazzOuter);
5066 clazzOuter = site;
5067 }
5068 }
5069 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5070 clazztype.getMetadata());
5071 } else {
5072 if (formals.length() != 0) {
5073 log.error(tree.pos(),
5074 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5075 } else {
5076 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5077 }
5078 owntype = types.createErrorType(tree.type);
5079 }
5080 } else if (clazztype.hasTag(ERROR)) {
5081 ErrorType parameterizedErroneous =
5082 new ErrorType(clazztype.getOriginalType(),
5083 clazztype.tsym,
5084 clazztype.getMetadata());
5085
5086 parameterizedErroneous.typarams_field = actuals;
5087 owntype = parameterizedErroneous;
5088 }
5089 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5090 }
5091
5092 public void visitTypeUnion(JCTypeUnion tree) {
5093 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5094 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5095 for (JCExpression typeTree : tree.alternatives) {
5096 Type ctype = attribType(typeTree, env);
5097 ctype = chk.checkType(typeTree.pos(),
5098 chk.checkClassType(typeTree.pos(), ctype),
5099 syms.throwableType);
5100 if (!ctype.isErroneous()) {
5101 //check that alternatives of a union type are pairwise
5102 //unrelated w.r.t. subtyping
5103 if (chk.intersects(ctype, multicatchTypes.toList())) {
5104 for (Type t : multicatchTypes) {
5105 boolean sub = types.isSubtype(ctype, t);
5106 boolean sup = types.isSubtype(t, ctype);
5107 if (sub || sup) {
5108 //assume 'a' <: 'b'
5109 Type a = sub ? ctype : t;
5110 Type b = sub ? t : ctype;
5111 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5112 }
5113 }
5114 }
5115 multicatchTypes.append(ctype);
5116 if (all_multicatchTypes != null)
5117 all_multicatchTypes.append(ctype);
5118 } else {
5119 if (all_multicatchTypes == null) {
5120 all_multicatchTypes = new ListBuffer<>();
5121 all_multicatchTypes.appendList(multicatchTypes);
5122 }
5123 all_multicatchTypes.append(ctype);
5124 }
5125 }
5126 Type t = check(tree, types.lub(multicatchTypes.toList()),
5127 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5128 if (t.hasTag(CLASS)) {
5129 List<Type> alternatives =
5130 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5131 t = new UnionClassType((ClassType) t, alternatives);
5132 }
5133 tree.type = result = t;
5134 }
5135
5136 public void visitTypeIntersection(JCTypeIntersection tree) {
5137 attribTypes(tree.bounds, env);
5138 tree.type = result = checkIntersection(tree, tree.bounds);
5139 }
5140
5141 public void visitTypeParameter(JCTypeParameter tree) {
5142 TypeVar typeVar = (TypeVar) tree.type;
5143
5144 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5145 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5146 }
5147
5148 if (!typeVar.getUpperBound().isErroneous()) {
5149 //fixup type-parameter bound computed in 'attribTypeVariables'
5150 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5151 }
5152 }
5153
5154 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5155 Set<Symbol> boundSet = new HashSet<>();
5156 if (bounds.nonEmpty()) {
5157 // accept class or interface or typevar as first bound.
5158 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5159 boundSet.add(types.erasure(bounds.head.type).tsym);
5160 if (bounds.head.type.isErroneous()) {
5161 return bounds.head.type;
5162 }
5163 else if (bounds.head.type.hasTag(TYPEVAR)) {
5164 // if first bound was a typevar, do not accept further bounds.
5165 if (bounds.tail.nonEmpty()) {
5166 log.error(bounds.tail.head.pos(),
5167 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5168 return bounds.head.type;
5169 }
5170 } else {
5171 // if first bound was a class or interface, accept only interfaces
5172 // as further bounds.
5173 for (JCExpression bound : bounds.tail) {
5174 bound.type = checkBase(bound.type, bound, env, false, true, false);
5175 if (bound.type.isErroneous()) {
5176 bounds = List.of(bound);
5177 }
5178 else if (bound.type.hasTag(CLASS)) {
5179 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5180 }
5181 }
5182 }
5183 }
5184
5185 if (bounds.length() == 0) {
5186 return syms.objectType;
5187 } else if (bounds.length() == 1) {
5188 return bounds.head.type;
5189 } else {
5190 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5191 // ... the variable's bound is a class type flagged COMPOUND
5192 // (see comment for TypeVar.bound).
5193 // In this case, generate a class tree that represents the
5194 // bound class, ...
5195 JCExpression extending;
5196 List<JCExpression> implementing;
5197 if (!bounds.head.type.isInterface()) {
5198 extending = bounds.head;
5199 implementing = bounds.tail;
5200 } else {
5201 extending = null;
5202 implementing = bounds;
5203 }
5204 JCClassDecl cd = make.at(tree).ClassDef(
5205 make.Modifiers(PUBLIC | ABSTRACT),
5206 names.empty, List.nil(),
5207 extending, implementing, List.nil());
5208
5209 ClassSymbol c = (ClassSymbol)owntype.tsym;
5210 Assert.check((c.flags() & COMPOUND) != 0);
5211 cd.sym = c;
5212 c.sourcefile = env.toplevel.sourcefile;
5213
5214 // ... and attribute the bound class
5215 c.flags_field |= UNATTRIBUTED;
5216 Env<AttrContext> cenv = enter.classEnv(cd, env);
5217 typeEnvs.put(c, cenv);
5218 attribClass(c);
5219 return owntype;
5220 }
5221 }
5222
5223 public void visitWildcard(JCWildcard tree) {
5224 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5225 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5226 ? syms.objectType
5227 : attribType(tree.inner, env);
5228 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5229 tree.kind.kind,
5230 syms.boundClass),
5231 KindSelector.TYP, resultInfo);
5232 }
5233
5234 public void visitAnnotation(JCAnnotation tree) {
5235 Assert.error("should be handled in annotate");
5236 }
5237
5238 @Override
5239 public void visitModifiers(JCModifiers tree) {
5240 //error recovery only:
5241 Assert.check(resultInfo.pkind == KindSelector.ERR);
5242
5243 attribAnnotationTypes(tree.annotations, env);
5244 }
5245
5246 public void visitAnnotatedType(JCAnnotatedType tree) {
5247 attribAnnotationTypes(tree.annotations, env);
5248 Type underlyingType = attribType(tree.underlyingType, env);
5249 Type annotatedType = underlyingType.preannotatedType();
5250
5251 if (!env.info.isNewClass)
5252 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5253 result = tree.type = annotatedType;
5254 }
5255
5256 public void visitErroneous(JCErroneous tree) {
5257 if (tree.errs != null) {
5258 WriteableScope newScope = env.info.scope;
5259
5260 if (env.tree instanceof JCClassDecl) {
5261 Symbol fakeOwner =
5262 new MethodSymbol(BLOCK, names.empty, null,
5263 env.info.scope.owner);
5264 newScope = newScope.dupUnshared(fakeOwner);
5265 }
5266
5267 Env<AttrContext> errEnv =
5268 env.dup(env.tree,
5269 env.info.dup(newScope));
5270 errEnv.info.returnResult = unknownExprInfo;
5271 for (JCTree err : tree.errs)
5272 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5273 }
5274 result = tree.type = syms.errType;
5275 }
5276
5277 /** Default visitor method for all other trees.
5278 */
5279 public void visitTree(JCTree tree) {
5280 throw new AssertionError();
5281 }
5282
5283 /**
5284 * Attribute an env for either a top level tree or class or module declaration.
5285 */
5286 public void attrib(Env<AttrContext> env) {
5287 switch (env.tree.getTag()) {
5288 case MODULEDEF:
5289 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5290 break;
5291 case PACKAGEDEF:
5292 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5293 break;
5294 default:
5295 attribClass(env.tree.pos(), env.enclClass.sym);
5296 }
5297
5298 annotate.flush();
5299 }
5300
5301 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5302 try {
5303 annotate.flush();
5304 attribPackage(p);
5305 } catch (CompletionFailure ex) {
5306 chk.completionError(pos, ex);
5307 }
5308 }
5309
5310 void attribPackage(PackageSymbol p) {
5311 attribWithLint(p,
5312 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5313 }
5314
5315 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5316 try {
5317 annotate.flush();
5318 attribModule(m);
5319 } catch (CompletionFailure ex) {
5320 chk.completionError(pos, ex);
5321 }
5322 }
5323
5324 void attribModule(ModuleSymbol m) {
5325 attribWithLint(m, env -> attribStat(env.tree, env));
5326 }
5327
5328 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5329 Env<AttrContext> env = typeEnvs.get(sym);
5330
5331 Env<AttrContext> lintEnv = env;
5332 while (lintEnv.info.lint == null)
5333 lintEnv = lintEnv.next;
5334
5335 Lint lint = lintEnv.info.lint.augment(sym);
5336
5337 Lint prevLint = chk.setLint(lint);
5338 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5339
5340 try {
5341 deferredLintHandler.flush(env.tree.pos(), lint);
5342 attrib.accept(env);
5343 } finally {
5344 log.useSource(prev);
5345 chk.setLint(prevLint);
5346 }
5347 }
5348
5349 /** Main method: attribute class definition associated with given class symbol.
5350 * reporting completion failures at the given position.
5351 * @param pos The source position at which completion errors are to be
5352 * reported.
5353 * @param c The class symbol whose definition will be attributed.
5354 */
5355 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5356 try {
5357 annotate.flush();
5358 attribClass(c);
5359 } catch (CompletionFailure ex) {
5360 chk.completionError(pos, ex);
5361 }
5362 }
5363
5364 /** Attribute class definition associated with given class symbol.
5365 * @param c The class symbol whose definition will be attributed.
5366 */
5367 void attribClass(ClassSymbol c) throws CompletionFailure {
5368 if (c.type.hasTag(ERROR)) return;
5369
5370 // Check for cycles in the inheritance graph, which can arise from
5371 // ill-formed class files.
5372 chk.checkNonCyclic(null, c.type);
5373
5374 Type st = types.supertype(c.type);
5375 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5376 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5377 // First, attribute superclass.
5378 if (st.hasTag(CLASS))
5379 attribClass((ClassSymbol)st.tsym);
5380
5381 // Next attribute owner, if it is a class.
5382 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5383 attribClass((ClassSymbol)c.owner);
5384
5385 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5386 }
5387
5388 // The previous operations might have attributed the current class
5389 // if there was a cycle. So we test first whether the class is still
5390 // UNATTRIBUTED.
5391 if ((c.flags_field & UNATTRIBUTED) != 0) {
5392 c.flags_field &= ~UNATTRIBUTED;
5393
5394 // Get environment current at the point of class definition.
5395 Env<AttrContext> env = typeEnvs.get(c);
5396
5397 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5398 // because the annotations were not available at the time the env was created. Therefore,
5399 // we look up the environment chain for the first enclosing environment for which the
5400 // lint value is set. Typically, this is the parent env, but might be further if there
5401 // are any envs created as a result of TypeParameter nodes.
5402 Env<AttrContext> lintEnv = env;
5403 while (lintEnv.info.lint == null)
5404 lintEnv = lintEnv.next;
5405
5406 // Having found the enclosing lint value, we can initialize the lint value for this class
5407 env.info.lint = lintEnv.info.lint.augment(c);
5408
5409 Lint prevLint = chk.setLint(env.info.lint);
5410 JavaFileObject prev = log.useSource(c.sourcefile);
5411 ResultInfo prevReturnRes = env.info.returnResult;
5412
5413 try {
5414 if (c.isSealed() &&
5415 !c.isEnum() &&
5416 !c.isPermittedExplicit &&
5417 c.getPermittedSubclasses().isEmpty()) {
5418 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5419 }
5420
5421 if (c.isSealed()) {
5422 Set<Symbol> permittedTypes = new HashSet<>();
5423 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5424 for (Type subType : c.getPermittedSubclasses()) {
5425 boolean isTypeVar = false;
5426 if (subType.getTag() == TYPEVAR) {
5427 isTypeVar = true; //error recovery
5428 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5429 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5430 }
5431 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5432 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5433 }
5434 if (permittedTypes.contains(subType.tsym)) {
5435 DiagnosticPosition pos =
5436 env.enclClass.permitting.stream()
5437 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5438 .limit(2).collect(List.collector()).get(1);
5439 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5440 } else {
5441 permittedTypes.add(subType.tsym);
5442 }
5443 if (sealedInUnnamed) {
5444 if (subType.tsym.packge() != c.packge()) {
5445 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5446 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5447 );
5448 }
5449 } else if (subType.tsym.packge().modle != c.packge().modle) {
5450 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5451 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5452 );
5453 }
5454 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5455 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5456 Errors.InvalidPermitsClause(
5457 subType.tsym == c.type.tsym ?
5458 Fragments.MustNotBeSameClass :
5459 Fragments.MustNotBeSupertype(subType)
5460 )
5461 );
5462 } else if (!isTypeVar) {
5463 boolean thisIsASuper = types.directSupertypes(subType)
5464 .stream()
5465 .anyMatch(d -> d.tsym == c);
5466 if (!thisIsASuper) {
5467 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5468 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5469 }
5470 }
5471 }
5472 }
5473
5474 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5475 .stream()
5476 .filter(s -> s.tsym.isSealed())
5477 .map(s -> (ClassSymbol) s.tsym)
5478 .collect(List.collector());
5479
5480 if (sealedSupers.isEmpty()) {
5481 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5482 boolean hasErrorSuper = false;
5483
5484 hasErrorSuper |= types.directSupertypes(c.type)
5485 .stream()
5486 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5487
5488 ClassType ct = (ClassType) c.type;
5489
5490 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5491
5492 if (!hasErrorSuper) {
5493 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5494 }
5495 }
5496 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5497 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5498 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5499 }
5500
5501 if (!c.type.isCompound()) {
5502 for (ClassSymbol supertypeSym : sealedSupers) {
5503 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5504 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5505 }
5506 }
5507 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5508 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5509 c.isInterface() ?
5510 Errors.NonSealedOrSealedExpected :
5511 Errors.NonSealedSealedOrFinalExpected);
5512 }
5513 }
5514 }
5515
5516 deferredLintHandler.flush(env.tree, env.info.lint);
5517 env.info.returnResult = null;
5518 // java.lang.Enum may not be subclassed by a non-enum
5519 if (st.tsym == syms.enumSym &&
5520 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5521 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5522
5523 // Enums may not be extended by source-level classes
5524 if (st.tsym != null &&
5525 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5526 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5527 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5528 }
5529
5530 if (rs.isSerializable(c.type)) {
5531 env.info.isSerializable = true;
5532 }
5533
5534 if (c.isValueClass()) {
5535 Assert.check(env.tree.hasTag(CLASSDEF));
5536 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5537 }
5538
5539 attribClassBody(env, c);
5540
5541 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5542 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5543 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5544 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5545
5546 if (c.isImplicit()) {
5547 chk.checkHasMain(env.tree.pos(), c);
5548 }
5549 } finally {
5550 env.info.returnResult = prevReturnRes;
5551 log.useSource(prev);
5552 chk.setLint(prevLint);
5553 }
5554
5555 }
5556 }
5557
5558 public void visitImport(JCImport tree) {
5559 // nothing to do
5560 }
5561
5562 public void visitModuleDef(JCModuleDecl tree) {
5563 tree.sym.completeUsesProvides();
5564 ModuleSymbol msym = tree.sym;
5565 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5566 Lint prevLint = chk.setLint(lint);
5567 chk.checkModuleName(tree);
5568 chk.checkDeprecatedAnnotation(tree, msym);
5569
5570 try {
5571 deferredLintHandler.flush(tree.pos(), lint);
5572 } finally {
5573 chk.setLint(prevLint);
5574 }
5575 }
5576
5577 /** Finish the attribution of a class. */
5578 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5579 JCClassDecl tree = (JCClassDecl)env.tree;
5580 Assert.check(c == tree.sym);
5581
5582 // Validate type parameters, supertype and interfaces.
5583 attribStats(tree.typarams, env);
5584 if (!c.isAnonymous()) {
5585 //already checked if anonymous
5586 chk.validate(tree.typarams, env);
5587 chk.validate(tree.extending, env);
5588 chk.validate(tree.implementing, env);
5589 }
5590
5591 c.markAbstractIfNeeded(types);
5592
5593 // If this is a non-abstract class, check that it has no abstract
5594 // methods or unimplemented methods of an implemented interface.
5595 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5596 chk.checkAllDefined(tree.pos(), c);
5597 }
5598
5599 if ((c.flags() & ANNOTATION) != 0) {
5600 if (tree.implementing.nonEmpty())
5601 log.error(tree.implementing.head.pos(),
5602 Errors.CantExtendIntfAnnotation);
5603 if (tree.typarams.nonEmpty()) {
5604 log.error(tree.typarams.head.pos(),
5605 Errors.IntfAnnotationCantHaveTypeParams(c));
5606 }
5607
5608 // If this annotation type has a @Repeatable, validate
5609 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5610 // If this annotation type has a @Repeatable, validate
5611 if (repeatable != null) {
5612 // get diagnostic position for error reporting
5613 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5614 Assert.checkNonNull(cbPos);
5615
5616 chk.validateRepeatable(c, repeatable, cbPos);
5617 }
5618 } else {
5619 // Check that all extended classes and interfaces
5620 // are compatible (i.e. no two define methods with same arguments
5621 // yet different return types). (JLS 8.4.8.3)
5622 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5623 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5624 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5625 }
5626
5627 // Check that class does not import the same parameterized interface
5628 // with two different argument lists.
5629 chk.checkClassBounds(tree.pos(), c.type);
5630
5631 tree.type = c.type;
5632
5633 for (List<JCTypeParameter> l = tree.typarams;
5634 l.nonEmpty(); l = l.tail) {
5635 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5636 }
5637
5638 // Check that a generic class doesn't extend Throwable
5639 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5640 log.error(tree.extending.pos(), Errors.GenericThrowable);
5641
5642 // Check that all methods which implement some
5643 // method conform to the method they implement.
5644 chk.checkImplementations(tree);
5645
5646 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5647 checkAutoCloseable(tree.pos(), env, c.type);
5648
5649 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5650 // Attribute declaration
5651 attribStat(l.head, env);
5652 // Check that declarations in inner classes are not static (JLS 8.1.2)
5653 // Make an exception for static constants.
5654 if (!allowRecords &&
5655 c.owner.kind != PCK &&
5656 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5657 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5658 VarSymbol sym = null;
5659 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5660 if (sym == null ||
5661 sym.kind != VAR ||
5662 sym.getConstValue() == null)
5663 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5664 }
5665 }
5666
5667 // Check for proper placement of super()/this() calls.
5668 chk.checkSuperInitCalls(tree);
5669
5670 // Check for cycles among non-initial constructors.
5671 chk.checkCyclicConstructors(tree);
5672
5673 // Check for cycles among annotation elements.
5674 chk.checkNonCyclicElements(tree);
5675
5676 // Check for proper use of serialVersionUID and other
5677 // serialization-related fields and methods
5678 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5679 && rs.isSerializable(c.type)
5680 && !c.isAnonymous()) {
5681 chk.checkSerialStructure(env, tree, c);
5682 }
5683 // Correctly organize the positions of the type annotations
5684 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5685
5686 // Check type annotations applicability rules
5687 validateTypeAnnotations(tree, false);
5688 }
5689 // where
5690 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5691 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5692 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5693 if (types.isSameType(al.head.annotationType.type, t))
5694 return al.head.pos();
5695 }
5696
5697 return null;
5698 }
5699
5700 private Type capture(Type type) {
5701 return types.capture(type);
5702 }
5703
5704 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5705 if (type.isErroneous()) {
5706 tree.vartype = make.at(Position.NOPOS).Erroneous();
5707 } else {
5708 tree.vartype = make.at(Position.NOPOS).Type(type);
5709 }
5710 }
5711
5712 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5713 tree.accept(new TypeAnnotationsValidator(sigOnly));
5714 }
5715 //where
5716 private final class TypeAnnotationsValidator extends TreeScanner {
5717
5718 private final boolean sigOnly;
5719 public TypeAnnotationsValidator(boolean sigOnly) {
5720 this.sigOnly = sigOnly;
5721 }
5722
5723 public void visitAnnotation(JCAnnotation tree) {
5724 chk.validateTypeAnnotation(tree, null, false);
5725 super.visitAnnotation(tree);
5726 }
5727 public void visitAnnotatedType(JCAnnotatedType tree) {
5728 if (!tree.underlyingType.type.isErroneous()) {
5729 super.visitAnnotatedType(tree);
5730 }
5731 }
5732 public void visitTypeParameter(JCTypeParameter tree) {
5733 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5734 scan(tree.bounds);
5735 // Don't call super.
5736 // This is needed because above we call validateTypeAnnotation with
5737 // false, which would forbid annotations on type parameters.
5738 // super.visitTypeParameter(tree);
5739 }
5740 public void visitMethodDef(JCMethodDecl tree) {
5741 if (tree.recvparam != null &&
5742 !tree.recvparam.vartype.type.isErroneous()) {
5743 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5744 }
5745 if (tree.restype != null && tree.restype.type != null) {
5746 validateAnnotatedType(tree.restype, tree.restype.type);
5747 }
5748 if (sigOnly) {
5749 scan(tree.mods);
5750 scan(tree.restype);
5751 scan(tree.typarams);
5752 scan(tree.recvparam);
5753 scan(tree.params);
5754 scan(tree.thrown);
5755 } else {
5756 scan(tree.defaultValue);
5757 scan(tree.body);
5758 }
5759 }
5760 public void visitVarDef(final JCVariableDecl tree) {
5761 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5762 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5763 validateAnnotatedType(tree.vartype, tree.sym.type);
5764 scan(tree.mods);
5765 scan(tree.vartype);
5766 if (!sigOnly) {
5767 scan(tree.init);
5768 }
5769 }
5770 public void visitTypeCast(JCTypeCast tree) {
5771 if (tree.clazz != null && tree.clazz.type != null)
5772 validateAnnotatedType(tree.clazz, tree.clazz.type);
5773 super.visitTypeCast(tree);
5774 }
5775 public void visitTypeTest(JCInstanceOf tree) {
5776 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5777 validateAnnotatedType(tree.pattern, tree.pattern.type);
5778 super.visitTypeTest(tree);
5779 }
5780 public void visitNewClass(JCNewClass tree) {
5781 if (tree.clazz != null && tree.clazz.type != null) {
5782 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5783 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5784 tree.clazz.type.tsym);
5785 }
5786 if (tree.def != null) {
5787 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5788 }
5789
5790 validateAnnotatedType(tree.clazz, tree.clazz.type);
5791 }
5792 super.visitNewClass(tree);
5793 }
5794 public void visitNewArray(JCNewArray tree) {
5795 if (tree.elemtype != null && tree.elemtype.type != null) {
5796 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5797 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5798 tree.elemtype.type.tsym);
5799 }
5800 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5801 }
5802 super.visitNewArray(tree);
5803 }
5804 public void visitClassDef(JCClassDecl tree) {
5805 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5806 if (sigOnly) {
5807 scan(tree.mods);
5808 scan(tree.typarams);
5809 scan(tree.extending);
5810 scan(tree.implementing);
5811 }
5812 for (JCTree member : tree.defs) {
5813 if (member.hasTag(Tag.CLASSDEF)) {
5814 continue;
5815 }
5816 scan(member);
5817 }
5818 }
5819 public void visitBlock(JCBlock tree) {
5820 if (!sigOnly) {
5821 scan(tree.stats);
5822 }
5823 }
5824
5825 /* I would want to model this after
5826 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5827 * and override visitSelect and visitTypeApply.
5828 * However, we only set the annotated type in the top-level type
5829 * of the symbol.
5830 * Therefore, we need to override each individual location where a type
5831 * can occur.
5832 */
5833 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5834 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5835
5836 if (type.isPrimitiveOrVoid()) {
5837 return;
5838 }
5839
5840 JCTree enclTr = errtree;
5841 Type enclTy = type;
5842
5843 boolean repeat = true;
5844 while (repeat) {
5845 if (enclTr.hasTag(TYPEAPPLY)) {
5846 List<Type> tyargs = enclTy.getTypeArguments();
5847 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5848 if (trargs.length() > 0) {
5849 // Nothing to do for diamonds
5850 if (tyargs.length() == trargs.length()) {
5851 for (int i = 0; i < tyargs.length(); ++i) {
5852 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5853 }
5854 }
5855 // If the lengths don't match, it's either a diamond
5856 // or some nested type that redundantly provides
5857 // type arguments in the tree.
5858 }
5859
5860 // Look at the clazz part of a generic type
5861 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5862 }
5863
5864 if (enclTr.hasTag(SELECT)) {
5865 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5866 if (enclTy != null &&
5867 !enclTy.hasTag(NONE)) {
5868 enclTy = enclTy.getEnclosingType();
5869 }
5870 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5871 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5872 if (enclTy == null || enclTy.hasTag(NONE)) {
5873 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5874 for (JCAnnotation an : at.getAnnotations()) {
5875 if (chk.isTypeAnnotation(an, false)) {
5876 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5877 }
5878 }
5879 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5880 if (!onlyTypeAnnotations.isEmpty()) {
5881 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5882 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5883 Fragments.TypeAnnotation(onlyTypeAnnotations);
5884 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5885 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5886 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5887 type.tsym.owner, annotatedType));
5888 }
5889 repeat = false;
5890 }
5891 enclTr = at.underlyingType;
5892 // enclTy doesn't need to be changed
5893 } else if (enclTr.hasTag(IDENT)) {
5894 repeat = false;
5895 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5896 JCWildcard wc = (JCWildcard) enclTr;
5897 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5898 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5899 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5900 } else {
5901 // Nothing to do for UNBOUND
5902 }
5903 repeat = false;
5904 } else if (enclTr.hasTag(TYPEARRAY)) {
5905 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5906 validateAnnotatedType(art.getType(), art.elemtype.type);
5907 repeat = false;
5908 } else if (enclTr.hasTag(TYPEUNION)) {
5909 JCTypeUnion ut = (JCTypeUnion) enclTr;
5910 for (JCTree t : ut.getTypeAlternatives()) {
5911 validateAnnotatedType(t, t.type);
5912 }
5913 repeat = false;
5914 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5915 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5916 for (JCTree t : it.getBounds()) {
5917 validateAnnotatedType(t, t.type);
5918 }
5919 repeat = false;
5920 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5921 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5922 repeat = false;
5923 } else {
5924 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5925 " within: "+ errtree + " with kind: " + errtree.getKind());
5926 }
5927 }
5928 }
5929
5930 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5931 Symbol sym) {
5932 // Ensure that no declaration annotations are present.
5933 // Note that a tree type might be an AnnotatedType with
5934 // empty annotations, if only declaration annotations were given.
5935 // This method will raise an error for such a type.
5936 for (JCAnnotation ai : annotations) {
5937 if (!ai.type.isErroneous() &&
5938 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5939 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5940 }
5941 }
5942 }
5943 }
5944
5945 // <editor-fold desc="post-attribution visitor">
5946
5947 /**
5948 * Handle missing types/symbols in an AST. This routine is useful when
5949 * the compiler has encountered some errors (which might have ended up
5950 * terminating attribution abruptly); if the compiler is used in fail-over
5951 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5952 * prevents NPE to be propagated during subsequent compilation steps.
5953 */
5954 public void postAttr(JCTree tree) {
5955 new PostAttrAnalyzer().scan(tree);
5956 }
5957
5958 class PostAttrAnalyzer extends TreeScanner {
5959
5960 private void initTypeIfNeeded(JCTree that) {
5961 if (that.type == null) {
5962 if (that.hasTag(METHODDEF)) {
5963 that.type = dummyMethodType((JCMethodDecl)that);
5964 } else {
5965 that.type = syms.unknownType;
5966 }
5967 }
5968 }
5969
5970 /* Construct a dummy method type. If we have a method declaration,
5971 * and the declared return type is void, then use that return type
5972 * instead of UNKNOWN to avoid spurious error messages in lambda
5973 * bodies (see:JDK-8041704).
5974 */
5975 private Type dummyMethodType(JCMethodDecl md) {
5976 Type restype = syms.unknownType;
5977 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5978 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5979 if (prim.typetag == VOID)
5980 restype = syms.voidType;
5981 }
5982 return new MethodType(List.nil(), restype,
5983 List.nil(), syms.methodClass);
5984 }
5985 private Type dummyMethodType() {
5986 return dummyMethodType(null);
5987 }
5988
5989 @Override
5990 public void scan(JCTree tree) {
5991 if (tree == null) return;
5992 if (tree instanceof JCExpression) {
5993 initTypeIfNeeded(tree);
5994 }
5995 super.scan(tree);
5996 }
5997
5998 @Override
5999 public void visitIdent(JCIdent that) {
6000 if (that.sym == null) {
6001 that.sym = syms.unknownSymbol;
6002 }
6003 }
6004
6005 @Override
6006 public void visitSelect(JCFieldAccess that) {
6007 if (that.sym == null) {
6008 that.sym = syms.unknownSymbol;
6009 }
6010 super.visitSelect(that);
6011 }
6012
6013 @Override
6014 public void visitClassDef(JCClassDecl that) {
6015 initTypeIfNeeded(that);
6016 if (that.sym == null) {
6017 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6018 }
6019 super.visitClassDef(that);
6020 }
6021
6022 @Override
6023 public void visitMethodDef(JCMethodDecl that) {
6024 initTypeIfNeeded(that);
6025 if (that.sym == null) {
6026 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6027 }
6028 super.visitMethodDef(that);
6029 }
6030
6031 @Override
6032 public void visitVarDef(JCVariableDecl that) {
6033 initTypeIfNeeded(that);
6034 if (that.sym == null) {
6035 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6036 that.sym.adr = 0;
6037 }
6038 if (that.vartype == null) {
6039 that.vartype = make.at(Position.NOPOS).Erroneous();
6040 }
6041 super.visitVarDef(that);
6042 }
6043
6044 @Override
6045 public void visitBindingPattern(JCBindingPattern that) {
6046 initTypeIfNeeded(that);
6047 initTypeIfNeeded(that.var);
6048 if (that.var.sym == null) {
6049 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6050 that.var.sym.adr = 0;
6051 }
6052 super.visitBindingPattern(that);
6053 }
6054
6055 @Override
6056 public void visitRecordPattern(JCRecordPattern that) {
6057 initTypeIfNeeded(that);
6058 if (that.record == null) {
6059 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6060 that.type, syms.noSymbol);
6061 }
6062 if (that.fullComponentTypes == null) {
6063 that.fullComponentTypes = List.nil();
6064 }
6065 super.visitRecordPattern(that);
6066 }
6067
6068 @Override
6069 public void visitNewClass(JCNewClass that) {
6070 if (that.constructor == null) {
6071 that.constructor = new MethodSymbol(0, names.init,
6072 dummyMethodType(), syms.noSymbol);
6073 }
6074 if (that.constructorType == null) {
6075 that.constructorType = syms.unknownType;
6076 }
6077 super.visitNewClass(that);
6078 }
6079
6080 @Override
6081 public void visitAssignop(JCAssignOp that) {
6082 if (that.operator == null) {
6083 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6084 -1, syms.noSymbol);
6085 }
6086 super.visitAssignop(that);
6087 }
6088
6089 @Override
6090 public void visitBinary(JCBinary that) {
6091 if (that.operator == null) {
6092 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6093 -1, syms.noSymbol);
6094 }
6095 super.visitBinary(that);
6096 }
6097
6098 @Override
6099 public void visitUnary(JCUnary that) {
6100 if (that.operator == null) {
6101 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6102 -1, syms.noSymbol);
6103 }
6104 super.visitUnary(that);
6105 }
6106
6107 @Override
6108 public void visitReference(JCMemberReference that) {
6109 super.visitReference(that);
6110 if (that.sym == null) {
6111 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6112 syms.noSymbol);
6113 }
6114 }
6115 }
6116 // </editor-fold>
6117
6118 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6119 new TreeScanner() {
6120 Symbol packge = pkg;
6121 @Override
6122 public void visitIdent(JCIdent that) {
6123 that.sym = packge;
6124 }
6125
6126 @Override
6127 public void visitSelect(JCFieldAccess that) {
6128 that.sym = packge;
6129 packge = packge.owner;
6130 super.visitSelect(that);
6131 }
6132 }.scan(pid);
6133 }
6134
6135 }