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