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