1 /*
2 * Copyright (c) 1999, 2021, 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
31 import javax.lang.model.element.ElementKind;
32 import javax.tools.JavaFileObject;
33
34 import com.sun.source.tree.CaseTree;
35 import com.sun.source.tree.IdentifierTree;
36 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
37 import com.sun.source.tree.MemberSelectTree;
38 import com.sun.source.tree.TreeVisitor;
39 import com.sun.source.util.SimpleTreeVisitor;
40 import com.sun.tools.javac.code.*;
41 import com.sun.tools.javac.code.Lint.LintCategory;
42 import com.sun.tools.javac.code.Scope.WriteableScope;
43 import com.sun.tools.javac.code.Source.Feature;
44 import com.sun.tools.javac.code.Symbol.*;
45 import com.sun.tools.javac.code.Type.*;
46 import com.sun.tools.javac.code.Type.ClassType.Flavor;
47 import com.sun.tools.javac.code.TypeMetadata.Annotations;
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 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
57 import com.sun.tools.javac.resources.CompilerProperties.Errors;
58 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
59 import com.sun.tools.javac.resources.CompilerProperties.Notes;
60 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
61 import com.sun.tools.javac.tree.*;
62 import com.sun.tools.javac.tree.JCTree.*;
63 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
64 import com.sun.tools.javac.util.*;
65 import com.sun.tools.javac.util.DefinedBy.Api;
66 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
67 import com.sun.tools.javac.util.JCDiagnostic.Error;
68 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
69 import com.sun.tools.javac.util.JCDiagnostic.Warning;
70 import com.sun.tools.javac.util.List;
71
72 import static com.sun.tools.javac.code.Flags.*;
73 import static com.sun.tools.javac.code.Flags.ANNOTATION;
74 import static com.sun.tools.javac.code.Flags.BLOCK;
75 import static com.sun.tools.javac.code.Kinds.*;
76 import static com.sun.tools.javac.code.Kinds.Kind.*;
77 import static com.sun.tools.javac.code.TypeTag.*;
78 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
79 import static com.sun.tools.javac.tree.JCTree.Tag.*;
80 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
81
82 /** This is the main context-dependent analysis phase in GJC. It
83 * encompasses name resolution, type checking and constant folding as
84 * subtasks. Some subtasks involve auxiliary classes.
85 * @see Check
86 * @see Resolve
87 * @see ConstFold
88 * @see Infer
89 *
90 * <p><b>This is NOT part of any supported API.
91 * If you write code that depends on this, you do so at your own risk.
92 * This code and its internal interfaces are subject to change or
93 * deletion without notice.</b>
94 */
95 public class Attr extends JCTree.Visitor {
96 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
97
98 final Names names;
99 final Log log;
100 final Symtab syms;
101 final Resolve rs;
102 final Operators operators;
103 final Infer infer;
104 final Analyzer analyzer;
105 final DeferredAttr deferredAttr;
106 final Check chk;
107 final Flow flow;
108 final MemberEnter memberEnter;
109 final TypeEnter typeEnter;
110 final TreeMaker make;
111 final ConstFold cfolder;
112 final Enter enter;
113 final Target target;
114 final Types types;
115 final Preview preview;
116 final JCDiagnostic.Factory diags;
117 final TypeAnnotations typeAnnotations;
118 final DeferredLintHandler deferredLintHandler;
119 final TypeEnvs typeEnvs;
120 final Dependencies dependencies;
121 final Annotate annotate;
122 final ArgumentAttr argumentAttr;
123 final MatchBindingsComputer matchBindingsComputer;
124 final AttrRecover attrRecover;
125
126 public static Attr instance(Context context) {
127 Attr instance = context.get(attrKey);
128 if (instance == null)
129 instance = new Attr(context);
130 return instance;
131 }
132
133 protected Attr(Context context) {
134 context.put(attrKey, this);
135
136 names = Names.instance(context);
137 log = Log.instance(context);
138 syms = Symtab.instance(context);
139 rs = Resolve.instance(context);
140 operators = Operators.instance(context);
141 chk = Check.instance(context);
142 flow = Flow.instance(context);
143 memberEnter = MemberEnter.instance(context);
144 typeEnter = TypeEnter.instance(context);
145 make = TreeMaker.instance(context);
146 enter = Enter.instance(context);
147 infer = Infer.instance(context);
148 analyzer = Analyzer.instance(context);
149 deferredAttr = DeferredAttr.instance(context);
150 cfolder = ConstFold.instance(context);
151 target = Target.instance(context);
152 types = Types.instance(context);
153 preview = Preview.instance(context);
154 diags = JCDiagnostic.Factory.instance(context);
155 annotate = Annotate.instance(context);
156 typeAnnotations = TypeAnnotations.instance(context);
157 deferredLintHandler = DeferredLintHandler.instance(context);
158 typeEnvs = TypeEnvs.instance(context);
159 dependencies = Dependencies.instance(context);
160 argumentAttr = ArgumentAttr.instance(context);
161 matchBindingsComputer = MatchBindingsComputer.instance(context);
162 attrRecover = AttrRecover.instance(context);
163
164 Options options = Options.instance(context);
165
166 Source source = Source.instance(context);
167 allowPoly = Feature.POLY.allowedInSource(source);
168 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
169 allowLambda = Feature.LAMBDA.allowedInSource(source);
170 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
171 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
172 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source);
173 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
174 allowRecords = Feature.RECORDS.allowedInSource(source);
175 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
176 Feature.PATTERN_SWITCH.allowedInSource(source);
177 sourceName = source.name;
178 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
179
180 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
181 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
182 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
183 methodAttrInfo = new MethodAttrInfo();
184 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
185 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
186 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
187 }
188
189 /** Switch: support target-typing inference
190 */
191 boolean allowPoly;
192
193 /** Switch: support type annotations.
194 */
195 boolean allowTypeAnnos;
196
197 /** Switch: support lambda expressions ?
198 */
199 boolean allowLambda;
200
201 /** Switch: support default methods ?
202 */
203 boolean allowDefaultMethods;
204
205 /** Switch: allow primitive classes ?
206 */
207 boolean allowPrimitiveClasses;
208
209 /** Switch: static interface methods enabled?
210 */
211 boolean allowStaticInterfaceMethods;
212
213 /** Switch: reifiable types in instanceof enabled?
214 */
215 boolean allowReifiableTypesInInstanceof;
216
217 /** Are records allowed
218 */
219 private final boolean allowRecords;
220
221 /** Are patterns in switch allowed
222 */
223 private final boolean allowPatternSwitch;
224
225 /**
226 * Switch: warn about use of variable before declaration?
227 * RFE: 6425594
228 */
229 boolean useBeforeDeclarationWarning;
230
231 /**
232 * Switch: name of source level; used for error reporting.
233 */
234 String sourceName;
235
236 /** Check kind and type of given tree against protokind and prototype.
237 * If check succeeds, store type in tree and return it.
238 * If check fails, store errType in tree and return it.
239 * No checks are performed if the prototype is a method type.
240 * It is not necessary in this case since we know that kind and type
241 * are correct.
242 *
243 * @param tree The tree whose kind and type is checked
244 * @param found The computed type of the tree
245 * @param ownkind The computed kind of the tree
246 * @param resultInfo The expected result of the tree
247 */
248 Type check(final JCTree tree,
249 final Type found,
250 final KindSelector ownkind,
251 final ResultInfo resultInfo) {
252 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
253 Type owntype;
254 boolean shouldCheck = !found.hasTag(ERROR) &&
255 !resultInfo.pt.hasTag(METHOD) &&
256 !resultInfo.pt.hasTag(FORALL);
257 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
258 log.error(tree.pos(),
259 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
260 ownkind.kindNames()));
261 owntype = types.createErrorType(found);
262 } else if (allowPoly && inferenceContext.free(found)) {
263 //delay the check if there are inference variables in the found type
264 //this means we are dealing with a partially inferred poly expression
265 owntype = shouldCheck ? resultInfo.pt : found;
266 if (resultInfo.checkMode.installPostInferenceHook()) {
267 inferenceContext.addFreeTypeListener(List.of(found),
268 instantiatedContext -> {
269 ResultInfo pendingResult =
270 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
271 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
272 });
273 }
274 } else {
275 owntype = shouldCheck ?
276 resultInfo.check(tree, found) :
277 found;
278 }
279 if (resultInfo.checkMode.updateTreeType()) {
280 tree.type = owntype;
281 }
282 return owntype;
283 }
284
285 /** Is given blank final variable assignable, i.e. in a scope where it
286 * may be assigned to even though it is final?
287 * @param v The blank final variable.
288 * @param env The current environment.
289 */
290 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
291 Symbol owner = env.info.scope.owner;
292 // owner refers to the innermost variable, method or
293 // initializer block declaration at this point.
294 boolean isAssignable =
295 v.owner == owner
296 ||
297 ((owner.name == names.init || // i.e. we are in a constructor
298 owner.kind == VAR || // i.e. we are in a variable initializer
299 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
300 &&
301 v.owner == owner.owner
302 &&
303 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
304 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
305 return isAssignable & !insideCompactConstructor;
306 }
307
308 /** Check that variable can be assigned to.
309 * @param pos The current source code position.
310 * @param v The assigned variable
311 * @param base If the variable is referred to in a Select, the part
312 * to the left of the `.', null otherwise.
313 * @param env The current environment.
314 */
315 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
316 if (v.name == names._this) {
317 log.error(pos, Errors.CantAssignValToThis);
318 } else if ((v.flags() & FINAL) != 0 &&
319 ((v.flags() & HASINIT) != 0
320 ||
321 !((base == null ||
322 TreeInfo.isThisQualifier(base)) &&
323 isAssignableAsBlankFinal(v, env)))) {
324 if (v.isResourceVariable()) { //TWR resource
325 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
326 } else {
327 boolean complain = true;
328 /* Allow updates to instance fields of primitive classes by any method in the same nest via the
329 withfield operator -This does not result in mutation of final fields; the code generator
330 would implement `copy on write' semantics via the opcode `withfield'.
331 */
332 if (env.info.inWithField && v.getKind() == ElementKind.FIELD && (v.flags() & STATIC) == 0 && v.owner.isPrimitiveClass()) {
333 if (env.enclClass.sym.outermostClass() == v.owner.outermostClass())
334 complain = false;
335 }
336 if (complain)
337 log.error(pos, Errors.CantAssignValToFinalVar(v));
338 }
339 }
340 }
341
342 /** Does tree represent a static reference to an identifier?
343 * It is assumed that tree is either a SELECT or an IDENT.
344 * We have to weed out selects from non-type names here.
345 * @param tree The candidate tree.
346 */
347 boolean isStaticReference(JCTree tree) {
348 if (tree.hasTag(SELECT)) {
349 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
350 if (lsym == null || lsym.kind != TYP) {
351 return false;
352 }
353 }
354 return true;
355 }
356
357 /** Is this symbol a type?
358 */
359 static boolean isType(Symbol sym) {
360 return sym != null && sym.kind == TYP;
361 }
362
363 /** The current `this' symbol.
364 * @param env The current environment.
365 */
366 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
367 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
368 }
369
370 /** Attribute a parsed identifier.
371 * @param tree Parsed identifier name
372 * @param topLevel The toplevel to use
373 */
374 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
375 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
376 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
377 syms.errSymbol.name,
378 null, null, null, null);
379 localEnv.enclClass.sym = syms.errSymbol;
380 return attribIdent(tree, localEnv);
381 }
382
383 /** Attribute a parsed identifier.
384 * @param tree Parsed identifier name
385 * @param env The env to use
386 */
387 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
388 return tree.accept(identAttributer, env);
389 }
390 // where
391 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
392 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
393 @Override @DefinedBy(Api.COMPILER_TREE)
394 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
395 Symbol site = visit(node.getExpression(), env);
396 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
397 return site;
398 Name name = (Name)node.getIdentifier();
399 if (site.kind == PCK) {
400 env.toplevel.packge = (PackageSymbol)site;
401 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
402 KindSelector.TYP_PCK);
403 } else {
404 env.enclClass.sym = (ClassSymbol)site;
405 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
406 }
407 }
408
409 @Override @DefinedBy(Api.COMPILER_TREE)
410 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
411 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
412 }
413 }
414
415 public Type coerce(Type etype, Type ttype) {
416 return cfolder.coerce(etype, ttype);
417 }
418
419 public Type attribType(JCTree node, TypeSymbol sym) {
420 Env<AttrContext> env = typeEnvs.get(sym);
421 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
422 return attribTree(node, localEnv, unknownTypeInfo);
423 }
424
425 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
426 // Attribute qualifying package or class.
427 JCFieldAccess s = (JCFieldAccess)tree.qualid;
428 return attribTree(s.selected, env,
429 new ResultInfo(tree.staticImport ?
430 KindSelector.TYP : KindSelector.TYP_PCK,
431 Type.noType));
432 }
433
434 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
435 return attribToTree(expr, env, tree, unknownExprInfo);
436 }
437
438 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
439 return attribToTree(stmt, env, tree, statInfo);
440 }
441
442 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
443 breakTree = tree;
444 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
445 try {
446 deferredAttr.attribSpeculative(root, env, resultInfo,
447 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
448 argumentAttr.withLocalCacheContext());
449 attrRecover.doRecovery();
450 } catch (BreakAttr b) {
451 return b.env;
452 } catch (AssertionError ae) {
453 if (ae.getCause() instanceof BreakAttr breakAttr) {
454 return breakAttr.env;
455 } else {
456 throw ae;
457 }
458 } finally {
459 breakTree = null;
460 log.useSource(prev);
461 }
462 return env;
463 }
464
465 private JCTree breakTree = null;
466
467 private static class BreakAttr extends RuntimeException {
468 static final long serialVersionUID = -6924771130405446405L;
469 private transient Env<AttrContext> env;
470 private BreakAttr(Env<AttrContext> env) {
471 this.env = env;
472 }
473 }
474
475 /**
476 * Mode controlling behavior of Attr.Check
477 */
478 enum CheckMode {
479
480 NORMAL,
481
482 /**
483 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
484 * that the captured var cache in {@code InferenceContext} will be used in read-only
485 * mode when performing inference checks.
486 */
487 NO_TREE_UPDATE {
488 @Override
489 public boolean updateTreeType() {
490 return false;
491 }
492 },
493 /**
494 * Mode signalling that caller will manage free types in tree decorations.
495 */
496 NO_INFERENCE_HOOK {
497 @Override
498 public boolean installPostInferenceHook() {
499 return false;
500 }
501 };
502
503 public boolean updateTreeType() {
504 return true;
505 }
506 public boolean installPostInferenceHook() {
507 return true;
508 }
509 }
510
511
512 class ResultInfo {
513 final KindSelector pkind;
514 final Type pt;
515 final CheckContext checkContext;
516 final CheckMode checkMode;
517
518 ResultInfo(KindSelector pkind, Type pt) {
519 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
520 }
521
522 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
523 this(pkind, pt, chk.basicHandler, checkMode);
524 }
525
526 protected ResultInfo(KindSelector pkind,
527 Type pt, CheckContext checkContext) {
528 this(pkind, pt, checkContext, CheckMode.NORMAL);
529 }
530
531 protected ResultInfo(KindSelector pkind,
532 Type pt, CheckContext checkContext, CheckMode checkMode) {
533 this.pkind = pkind;
534 this.pt = pt;
535 this.checkContext = checkContext;
536 this.checkMode = checkMode;
537 }
538
539 /**
540 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
541 * @param tree The tree to be type-checked.
542 * @return true if {@ArgumentAttr} should be used.
543 */
544 protected boolean needsArgumentAttr(JCTree tree) { return false; }
545
546 protected Type check(final DiagnosticPosition pos, final Type found) {
547 return chk.checkType(pos, found, pt, checkContext);
548 }
549
550 protected ResultInfo dup(Type newPt) {
551 return new ResultInfo(pkind, newPt, checkContext, checkMode);
552 }
553
554 protected ResultInfo dup(CheckContext newContext) {
555 return new ResultInfo(pkind, pt, newContext, checkMode);
556 }
557
558 protected ResultInfo dup(Type newPt, CheckContext newContext) {
559 return new ResultInfo(pkind, newPt, newContext, checkMode);
560 }
561
562 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
563 return new ResultInfo(pkind, newPt, newContext, newMode);
564 }
565
566 protected ResultInfo dup(CheckMode newMode) {
567 return new ResultInfo(pkind, pt, checkContext, newMode);
568 }
569
570 @Override
571 public String toString() {
572 if (pt != null) {
573 return pt.toString();
574 } else {
575 return "";
576 }
577 }
578 }
579
580 class MethodAttrInfo extends ResultInfo {
581 public MethodAttrInfo() {
582 this(chk.basicHandler);
583 }
584
585 public MethodAttrInfo(CheckContext checkContext) {
586 super(KindSelector.VAL, Infer.anyPoly, checkContext);
587 }
588
589 @Override
590 protected boolean needsArgumentAttr(JCTree tree) {
591 return true;
592 }
593
594 protected ResultInfo dup(Type newPt) {
595 throw new IllegalStateException();
596 }
597
598 protected ResultInfo dup(CheckContext newContext) {
599 return new MethodAttrInfo(newContext);
600 }
601
602 protected ResultInfo dup(Type newPt, CheckContext newContext) {
603 throw new IllegalStateException();
604 }
605
606 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
607 throw new IllegalStateException();
608 }
609
610 protected ResultInfo dup(CheckMode newMode) {
611 throw new IllegalStateException();
612 }
613 }
614
615 class RecoveryInfo extends ResultInfo {
616
617 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
618 this(deferredAttrContext, Type.recoveryType);
619 }
620
621 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
622 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
623 @Override
624 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
625 return deferredAttrContext;
626 }
627 @Override
628 public boolean compatible(Type found, Type req, Warner warn) {
629 return true;
630 }
631 @Override
632 public void report(DiagnosticPosition pos, JCDiagnostic details) {
633 boolean needsReport = pt == Type.recoveryType ||
634 (details.getDiagnosticPosition() != null &&
635 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
636 if (needsReport) {
637 chk.basicHandler.report(pos, details);
638 }
639 }
640 });
641 }
642 }
643
644 final ResultInfo statInfo;
645 final ResultInfo varAssignmentInfo;
646 final ResultInfo methodAttrInfo;
647 final ResultInfo unknownExprInfo;
648 final ResultInfo unknownTypeInfo;
649 final ResultInfo unknownTypeExprInfo;
650 final ResultInfo recoveryInfo;
651
652 Type pt() {
653 return resultInfo.pt;
654 }
655
656 KindSelector pkind() {
657 return resultInfo.pkind;
658 }
659
660 /* ************************************************************************
661 * Visitor methods
662 *************************************************************************/
663
664 /** Visitor argument: the current environment.
665 */
666 Env<AttrContext> env;
667
668 /** Visitor argument: the currently expected attribution result.
669 */
670 ResultInfo resultInfo;
671
672 /** Visitor result: the computed type.
673 */
674 Type result;
675
676 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
677
678 /** Visitor method: attribute a tree, catching any completion failure
679 * exceptions. Return the tree's type.
680 *
681 * @param tree The tree to be visited.
682 * @param env The environment visitor argument.
683 * @param resultInfo The result info visitor argument.
684 */
685 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
686 Env<AttrContext> prevEnv = this.env;
687 ResultInfo prevResult = this.resultInfo;
688 try {
689 this.env = env;
690 this.resultInfo = resultInfo;
691 if (resultInfo.needsArgumentAttr(tree)) {
692 result = argumentAttr.attribArg(tree, env);
693 } else {
694 tree.accept(this);
695 }
696 matchBindings = matchBindingsComputer.finishBindings(tree,
697 matchBindings);
698 if (tree == breakTree &&
699 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
700 breakTreeFound(copyEnv(env));
701 }
702 return result;
703 } catch (CompletionFailure ex) {
704 tree.type = syms.errType;
705 return chk.completionError(tree.pos(), ex);
706 } finally {
707 this.env = prevEnv;
708 this.resultInfo = prevResult;
709 }
710 }
711
712 protected void breakTreeFound(Env<AttrContext> env) {
713 throw new BreakAttr(env);
714 }
715
716 Env<AttrContext> copyEnv(Env<AttrContext> env) {
717 Env<AttrContext> newEnv =
718 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
719 if (newEnv.outer != null) {
720 newEnv.outer = copyEnv(newEnv.outer);
721 }
722 return newEnv;
723 }
724
725 WriteableScope copyScope(WriteableScope sc) {
726 WriteableScope newScope = WriteableScope.create(sc.owner);
727 List<Symbol> elemsList = List.nil();
728 for (Symbol sym : sc.getSymbols()) {
729 elemsList = elemsList.prepend(sym);
730 }
731 for (Symbol s : elemsList) {
732 newScope.enter(s);
733 }
734 return newScope;
735 }
736
737 /** Derived visitor method: attribute an expression tree.
738 */
739 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
740 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
741 }
742
743 /** Derived visitor method: attribute an expression tree with
744 * no constraints on the computed type.
745 */
746 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
747 return attribTree(tree, env, unknownExprInfo);
748 }
749
750 /** Derived visitor method: attribute a type tree.
751 */
752 public Type attribType(JCTree tree, Env<AttrContext> env) {
753 Type result = attribType(tree, env, Type.noType);
754 return result;
755 }
756
757 /** Derived visitor method: attribute a type tree.
758 */
759 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
760 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
761 return result;
762 }
763
764 /** Derived visitor method: attribute a statement or definition tree.
765 */
766 public Type attribStat(JCTree tree, Env<AttrContext> env) {
767 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
768 Type result = attribTree(tree, env, statInfo);
769 analyzer.analyzeIfNeeded(tree, analyzeEnv);
770 attrRecover.doRecovery();
771 return result;
772 }
773
774 /** Attribute a list of expressions, returning a list of types.
775 */
776 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
777 ListBuffer<Type> ts = new ListBuffer<>();
778 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
779 ts.append(attribExpr(l.head, env, pt));
780 return ts.toList();
781 }
782
783 /** Attribute a list of statements, returning nothing.
784 */
785 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
786 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
787 attribStat(l.head, env);
788 }
789
790 /** Attribute the arguments in a method call, returning the method kind.
791 */
792 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
793 KindSelector kind = initialKind;
794 for (JCExpression arg : trees) {
795 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
796 if (argtype.hasTag(DEFERRED)) {
797 kind = KindSelector.of(KindSelector.POLY, kind);
798 }
799 argtypes.append(argtype);
800 }
801 return kind;
802 }
803
804 /** Attribute a type argument list, returning a list of types.
805 * Caller is responsible for calling checkRefTypes.
806 */
807 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
808 ListBuffer<Type> argtypes = new ListBuffer<>();
809 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
810 argtypes.append(attribType(l.head, env));
811 return argtypes.toList();
812 }
813
814 /** Attribute a type argument list, returning a list of types.
815 * Check that all the types are references.
816 */
817 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
818 List<Type> types = attribAnyTypes(trees, env);
819 return chk.checkRefTypes(trees, types);
820 }
821
822 /**
823 * Attribute type variables (of generic classes or methods).
824 * Compound types are attributed later in attribBounds.
825 * @param typarams the type variables to enter
826 * @param env the current environment
827 */
828 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
829 for (JCTypeParameter tvar : typarams) {
830 TypeVar a = (TypeVar)tvar.type;
831 a.tsym.flags_field |= UNATTRIBUTED;
832 a.setUpperBound(Type.noType);
833 if (!tvar.bounds.isEmpty()) {
834 List<Type> bounds = List.of(chk.checkRefType(tvar.bounds.head, attribType(tvar.bounds.head, env), false));
835 for (JCExpression bound : tvar.bounds.tail)
836 bounds = bounds.prepend(chk.checkRefType(bound, attribType(bound, env), false));
837 types.setBounds(a, bounds.reverse());
838 } else {
839 // if no bounds are given, assume a single bound of
840 // java.lang.Object.
841 types.setBounds(a, List.of(syms.objectType));
842 }
843 a.tsym.flags_field &= ~UNATTRIBUTED;
844 }
845 if (checkCyclic) {
846 for (JCTypeParameter tvar : typarams) {
847 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
848 }
849 }
850 }
851
852 /**
853 * Attribute the type references in a list of annotations.
854 */
855 void attribAnnotationTypes(List<JCAnnotation> annotations,
856 Env<AttrContext> env) {
857 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
858 JCAnnotation a = al.head;
859 attribType(a.annotationType, env);
860 }
861 }
862
863 /**
864 * Attribute a "lazy constant value".
865 * @param env The env for the const value
866 * @param variable The initializer for the const value
867 * @param type The expected type, or null
868 * @see VarSymbol#setLazyConstValue
869 */
870 public Object attribLazyConstantValue(Env<AttrContext> env,
871 JCVariableDecl variable,
872 Type type) {
873
874 DiagnosticPosition prevLintPos
875 = deferredLintHandler.setPos(variable.pos());
876
877 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
878 try {
879 Type itype = attribExpr(variable.init, env, type);
880 if (variable.isImplicitlyTyped()) {
881 //fixup local variable type
882 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
883 }
884 if (itype.constValue() != null) {
885 return coerce(itype, type).constValue();
886 } else {
887 return null;
888 }
889 } finally {
890 log.useSource(prevSource);
891 deferredLintHandler.setPos(prevLintPos);
892 }
893 }
894
895 /** Attribute type reference in an `extends' or `implements' clause.
896 * Supertypes of anonymous inner classes are usually already attributed.
897 *
898 * @param tree The tree making up the type reference.
899 * @param env The environment current at the reference.
900 * @param classExpected true if only a class is expected here.
901 * @param interfaceExpected true if only an interface is expected here.
902 */
903 Type attribBase(JCTree tree,
904 Env<AttrContext> env,
905 boolean classExpected,
906 boolean interfaceExpected,
907 boolean checkExtensible) {
908 Type t = tree.type != null ?
909 tree.type :
910 attribType(tree, env);
911 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
912 }
913 Type checkBase(Type t,
914 JCTree tree,
915 Env<AttrContext> env,
916 boolean classExpected,
917 boolean interfaceExpected,
918 boolean checkExtensible) {
919 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
920 (((JCTypeApply) tree).clazz).pos() : tree.pos();
921 if (t.tsym.isAnonymous()) {
922 log.error(pos, Errors.CantInheritFromAnon);
923 return types.createErrorType(t);
924 }
925 if (t.isErroneous())
926 return t;
927 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
928 // check that type variable is already visible
929 if (t.getUpperBound() == null) {
930 log.error(pos, Errors.IllegalForwardRef);
931 return types.createErrorType(t);
932 }
933 } else {
934 t = chk.checkClassType(pos, t, checkExtensible);
935 }
936 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
937 log.error(pos, Errors.IntfExpectedHere);
938 // return errType is necessary since otherwise there might
939 // be undetected cycles which cause attribution to loop
940 return types.createErrorType(t);
941 } else if (checkExtensible &&
942 classExpected &&
943 (t.tsym.flags() & INTERFACE) != 0) {
944 log.error(pos, Errors.NoIntfExpectedHere);
945 return types.createErrorType(t);
946 }
947 if (checkExtensible &&
948 ((t.tsym.flags() & FINAL) != 0)) {
949 log.error(pos,
950 Errors.CantInheritFromFinal(t.tsym));
951 }
952 chk.checkNonCyclic(pos, t);
953 return t;
954 }
955
956 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
957 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
958 id.type = env.info.scope.owner.enclClass().type;
959 id.sym = env.info.scope.owner.enclClass();
960 return id.type;
961 }
962
963 public void visitClassDef(JCClassDecl tree) {
964 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
965 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
966 argumentAttr.withLocalCacheContext() : null);
967 try {
968 // Local and anonymous classes have not been entered yet, so we need to
969 // do it now.
970 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
971 enter.classEnter(tree, env);
972 } else {
973 // If this class declaration is part of a class level annotation,
974 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
975 // order to simplify later steps and allow for sensible error
976 // messages.
977 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
978 enter.classEnter(tree, env);
979 }
980
981 ClassSymbol c = tree.sym;
982 if (c == null) {
983 // exit in case something drastic went wrong during enter.
984 result = null;
985 } else {
986 // make sure class has been completed:
987 c.complete();
988
989 // If this class appears as an anonymous class
990 // in a superclass constructor call
991 // disable implicit outer instance from being passed.
992 // (This would be an illegal access to "this before super").
993 if (env.info.isSelfCall &&
994 env.tree.hasTag(NEWCLASS)) {
995 c.flags_field |= NOOUTERTHIS;
996 }
997 attribClass(tree.pos(), c);
998 result = tree.type = c.type;
999 }
1000 } finally {
1001 localCacheContext.ifPresent(LocalCacheContext::leave);
1002 }
1003 }
1004
1005 public void visitMethodDef(JCMethodDecl tree) {
1006 MethodSymbol m = tree.sym;
1007 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1008
1009 Lint lint = env.info.lint.augment(m);
1010 Lint prevLint = chk.setLint(lint);
1011 MethodSymbol prevMethod = chk.setMethod(m);
1012 try {
1013 deferredLintHandler.flush(tree.pos());
1014 chk.checkDeprecatedAnnotation(tree.pos(), m);
1015
1016
1017 // Create a new environment with local scope
1018 // for attributing the method.
1019 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1020 localEnv.info.lint = lint;
1021
1022 attribStats(tree.typarams, localEnv);
1023
1024 // If we override any other methods, check that we do so properly.
1025 // JLS ???
1026 if (m.isStatic()) {
1027 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1028 } else {
1029 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1030 }
1031 chk.checkOverride(env, tree, m);
1032
1033 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1034 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1035 }
1036
1037 // Enter all type parameters into the local method scope.
1038 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1039 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1040
1041 ClassSymbol owner = env.enclClass.sym;
1042 if ((owner.flags() & ANNOTATION) != 0 &&
1043 (tree.params.nonEmpty() ||
1044 tree.recvparam != null))
1045 log.error(tree.params.nonEmpty() ?
1046 tree.params.head.pos() :
1047 tree.recvparam.pos(),
1048 Errors.IntfAnnotationMembersCantHaveParams);
1049
1050 // Attribute all value parameters.
1051 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1052 attribStat(l.head, localEnv);
1053 }
1054
1055 chk.checkVarargsMethodDecl(localEnv, tree);
1056
1057 // Check that type parameters are well-formed.
1058 chk.validate(tree.typarams, localEnv);
1059
1060 // Check that result type is well-formed.
1061 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1062 chk.validate(tree.restype, localEnv);
1063
1064 // Check that receiver type is well-formed.
1065 if (tree.recvparam != null) {
1066 // Use a new environment to check the receiver parameter.
1067 // Otherwise I get "might not have been initialized" errors.
1068 // Is there a better way?
1069 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1070 attribType(tree.recvparam, newEnv);
1071 chk.validate(tree.recvparam, newEnv);
1072 }
1073
1074 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1075 // lets find if this method is an accessor
1076 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1077 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1078 if (recordComponent.isPresent()) {
1079 // the method is a user defined accessor lets check that everything is fine
1080 if (!tree.sym.isPublic()) {
1081 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1082 }
1083 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1084 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1085 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1086 }
1087 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1088 log.error(tree,
1089 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1090 }
1091 if (!tree.typarams.isEmpty()) {
1092 log.error(tree,
1093 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1094 }
1095 if (tree.sym.isStatic()) {
1096 log.error(tree,
1097 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1098 }
1099 }
1100
1101 if (tree.name == names.init) {
1102 // if this a constructor other than the canonical one
1103 if ((tree.sym.flags_field & RECORD) == 0) {
1104 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1105 if (app == null ||
1106 TreeInfo.name(app.meth) != names._this ||
1107 !checkFirstConstructorStat(app, tree, false)) {
1108 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1109 }
1110 } else {
1111 // but if it is the canonical:
1112
1113 /* if user generated, then it shouldn't:
1114 * - have an accessibility stricter than that of the record type
1115 * - explicitly invoke any other constructor
1116 */
1117 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1118 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1119 log.error(tree,
1120 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1121 Errors.InvalidCanonicalConstructorInRecord(
1122 Fragments.Canonical,
1123 env.enclClass.sym.name,
1124 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1125 ) :
1126 Errors.InvalidCanonicalConstructorInRecord(
1127 Fragments.Canonical,
1128 env.enclClass.sym.name,
1129 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1130 )
1131 );
1132 }
1133
1134 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1135 if (app != null &&
1136 (TreeInfo.name(app.meth) == names._this ||
1137 TreeInfo.name(app.meth) == names._super) &&
1138 checkFirstConstructorStat(app, tree, false)) {
1139 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1140 Fragments.Canonical, env.enclClass.sym.name,
1141 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1142 }
1143 }
1144
1145 // also we want to check that no type variables have been defined
1146 if (!tree.typarams.isEmpty()) {
1147 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1148 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1149 }
1150
1151 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1152 * record components
1153 */
1154 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1155 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1156 for (JCVariableDecl param: tree.params) {
1157 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1158 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1159 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1160 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1161 Fragments.Canonical, env.enclClass.sym.name,
1162 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1163 }
1164 recordComponents = recordComponents.tail;
1165 recordFieldTypes = recordFieldTypes.tail;
1166 }
1167 }
1168 }
1169 }
1170
1171 // annotation method checks
1172 if ((owner.flags() & ANNOTATION) != 0) {
1173 // annotation method cannot have throws clause
1174 if (tree.thrown.nonEmpty()) {
1175 log.error(tree.thrown.head.pos(),
1176 Errors.ThrowsNotAllowedInIntfAnnotation);
1177 }
1178 // annotation method cannot declare type-parameters
1179 if (tree.typarams.nonEmpty()) {
1180 log.error(tree.typarams.head.pos(),
1181 Errors.IntfAnnotationMembersCantHaveTypeParams);
1182 }
1183 // validate annotation method's return type (could be an annotation type)
1184 chk.validateAnnotationType(tree.restype);
1185 // ensure that annotation method does not clash with members of Object/Annotation
1186 chk.validateAnnotationMethod(tree.pos(), m);
1187 }
1188
1189 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1190 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1191
1192 if (tree.body == null) {
1193 // Empty bodies are only allowed for
1194 // abstract, native, or interface methods, or for methods
1195 // in a retrofit signature class.
1196 if (tree.defaultValue != null) {
1197 if ((owner.flags() & ANNOTATION) == 0)
1198 log.error(tree.pos(),
1199 Errors.DefaultAllowedInIntfAnnotationMember);
1200 }
1201 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1202 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1203 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1204 if ((owner.flags() & INTERFACE) != 0) {
1205 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1206 } else {
1207 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1208 }
1209 } else if ((tree.mods.flags & NATIVE) != 0) {
1210 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1211 } else {
1212 // Add an implicit super() call unless an explicit call to
1213 // super(...) or this(...) is given
1214 // or we are compiling class java.lang.Object.
1215 if (tree.name == names.init && owner.type != syms.objectType) {
1216 JCBlock body = tree.body;
1217 if (body.stats.isEmpty() ||
1218 TreeInfo.getConstructorInvocationName(body.stats, names, true) == names.empty) {
1219 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1220 make.Ident(names._super), make.Idents(List.nil())));
1221 body.stats = body.stats.prepend(supCall);
1222 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1223 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1224 TreeInfo.isSuperCall(body.stats.head)) {
1225 // enum constructors are not allowed to call super
1226 // directly, so make sure there aren't any super calls
1227 // in enum constructors, except in the compiler
1228 // generated one.
1229 log.error(tree.body.stats.head.pos(),
1230 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1231 } else if ((env.enclClass.sym.flags() & PRIMITIVE_CLASS) != 0 &&
1232 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1233 TreeInfo.isSuperCall(body.stats.head)) {
1234 // primitive constructors are not allowed to call super directly,
1235 // but tolerate compiler generated ones
1236 log.error(tree.body.stats.head.pos(), Errors.CallToSuperNotAllowedInPrimitiveCtor);
1237 }
1238 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1239 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1240 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1241 if (!initParamNames.equals(recordComponentNames)) {
1242 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1243 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1244 }
1245 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1246 log.error(tree,
1247 Errors.InvalidCanonicalConstructorInRecord(
1248 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1249 env.enclClass.sym.name,
1250 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1251 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1252 }
1253 }
1254 }
1255 if (m.isConstructor() && m.type.getParameterTypes().size() == 0) {
1256 if ((owner.type == syms.objectType) ||
1257 (tree.body.stats.size() == 1 && TreeInfo.getConstructorInvocationName(tree.body.stats, names, false) == names._super)) {
1258 m.flags_field |= EMPTYNOARGCONSTR;
1259 }
1260 }
1261
1262 // Attribute all type annotations in the body
1263 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1264 annotate.flush();
1265
1266 // Attribute method body.
1267 attribStat(tree.body, localEnv);
1268 }
1269
1270 localEnv.info.scope.leave();
1271 result = tree.type = m.type;
1272 } finally {
1273 chk.setLint(prevLint);
1274 chk.setMethod(prevMethod);
1275 }
1276 }
1277
1278 public void visitVarDef(JCVariableDecl tree) {
1279 // Local variables have not been entered yet, so we need to do it now:
1280 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1281 if (tree.sym != null) {
1282 // parameters have already been entered
1283 env.info.scope.enter(tree.sym);
1284 } else {
1285 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1286 if (tree.init == null) {
1287 //cannot use 'var' without initializer
1288 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1289 tree.vartype = make.Erroneous();
1290 } else {
1291 Fragment msg = canInferLocalVarType(tree);
1292 if (msg != null) {
1293 //cannot use 'var' with initializer which require an explicit target
1294 //(e.g. lambda, method reference, array initializer).
1295 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1296 tree.vartype = make.Erroneous();
1297 }
1298 }
1299 }
1300 try {
1301 annotate.blockAnnotations();
1302 memberEnter.memberEnter(tree, env);
1303 } finally {
1304 annotate.unblockAnnotations();
1305 }
1306 }
1307 } else {
1308 if (tree.init != null) {
1309 // Field initializer expression need to be entered.
1310 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1311 annotate.flush();
1312 }
1313 }
1314
1315 VarSymbol v = tree.sym;
1316 Lint lint = env.info.lint.augment(v);
1317 Lint prevLint = chk.setLint(lint);
1318
1319 // Check that the variable's declared type is well-formed.
1320 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1321 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1322 (tree.sym.flags() & PARAMETER) != 0;
1323 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1324
1325 try {
1326 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1327 deferredLintHandler.flush(tree.pos());
1328 chk.checkDeprecatedAnnotation(tree.pos(), v);
1329
1330 /* Don't want constant propagation/folding for instance fields of primitive classes,
1331 as these can undergo updates via copy on write.
1332 */
1333 if (tree.init != null) {
1334 if ((v.flags_field & FINAL) == 0 || ((v.flags_field & STATIC) == 0 && v.owner.isPrimitiveClass()) ||
1335 !memberEnter.needsLazyConstValue(tree.init)) {
1336 // Not a compile-time constant
1337 // Attribute initializer in a new environment
1338 // with the declared variable as owner.
1339 // Check that initializer conforms to variable's declared type.
1340 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1341 initEnv.info.lint = lint;
1342 // In order to catch self-references, we set the variable's
1343 // declaration position to maximal possible value, effectively
1344 // marking the variable as undefined.
1345 initEnv.info.enclVar = v;
1346 attribExpr(tree.init, initEnv, v.type);
1347 if (tree.isImplicitlyTyped()) {
1348 //fixup local variable type
1349 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1350 }
1351 }
1352 if (tree.isImplicitlyTyped()) {
1353 setSyntheticVariableType(tree, v.type);
1354 }
1355 }
1356 result = tree.type = v.type;
1357 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1358 if (isNonArgsMethodInObject(v.name)) {
1359 log.error(tree, Errors.IllegalRecordComponentName(v));
1360 }
1361 }
1362 }
1363 finally {
1364 chk.setLint(prevLint);
1365 }
1366 }
1367
1368 private boolean isNonArgsMethodInObject(Name name) {
1369 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1370 if (s.type.getParameterTypes().isEmpty()) {
1371 return true;
1372 }
1373 }
1374 return false;
1375 }
1376
1377 Fragment canInferLocalVarType(JCVariableDecl tree) {
1378 LocalInitScanner lis = new LocalInitScanner();
1379 lis.scan(tree.init);
1380 return lis.badInferenceMsg;
1381 }
1382
1383 static class LocalInitScanner extends TreeScanner {
1384 Fragment badInferenceMsg = null;
1385 boolean needsTarget = true;
1386
1387 @Override
1388 public void visitNewArray(JCNewArray tree) {
1389 if (tree.elemtype == null && needsTarget) {
1390 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1391 }
1392 }
1393
1394 @Override
1395 public void visitLambda(JCLambda tree) {
1396 if (needsTarget) {
1397 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1398 }
1399 }
1400
1401 @Override
1402 public void visitTypeCast(JCTypeCast tree) {
1403 boolean prevNeedsTarget = needsTarget;
1404 try {
1405 needsTarget = false;
1406 super.visitTypeCast(tree);
1407 } finally {
1408 needsTarget = prevNeedsTarget;
1409 }
1410 }
1411
1412 @Override
1413 public void visitReference(JCMemberReference tree) {
1414 if (needsTarget) {
1415 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1416 }
1417 }
1418
1419 @Override
1420 public void visitNewClass(JCNewClass tree) {
1421 boolean prevNeedsTarget = needsTarget;
1422 try {
1423 needsTarget = false;
1424 super.visitNewClass(tree);
1425 } finally {
1426 needsTarget = prevNeedsTarget;
1427 }
1428 }
1429
1430 @Override
1431 public void visitApply(JCMethodInvocation tree) {
1432 boolean prevNeedsTarget = needsTarget;
1433 try {
1434 needsTarget = false;
1435 super.visitApply(tree);
1436 } finally {
1437 needsTarget = prevNeedsTarget;
1438 }
1439 }
1440 }
1441
1442 public void visitSkip(JCSkip tree) {
1443 result = null;
1444 }
1445
1446 public void visitBlock(JCBlock tree) {
1447 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1448 // Block is a static or instance initializer;
1449 // let the owner of the environment be a freshly
1450 // created BLOCK-method.
1451 Symbol fakeOwner =
1452 new MethodSymbol(tree.flags | BLOCK |
1453 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1454 env.info.scope.owner);
1455 final Env<AttrContext> localEnv =
1456 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1457
1458 if ((tree.flags & STATIC) != 0)
1459 localEnv.info.staticLevel++;
1460 else if (tree.stats.size() > 0)
1461 env.info.scope.owner.flags_field |= HASINITBLOCK;
1462
1463 // Attribute all type annotations in the block
1464 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1465 annotate.flush();
1466 attribStats(tree.stats, localEnv);
1467
1468 {
1469 // Store init and clinit type annotations with the ClassSymbol
1470 // to allow output in Gen.normalizeDefs.
1471 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1472 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1473 if ((tree.flags & STATIC) != 0) {
1474 cs.appendClassInitTypeAttributes(tas);
1475 } else {
1476 cs.appendInitTypeAttributes(tas);
1477 }
1478 }
1479 } else {
1480 // Create a new local environment with a local scope.
1481 Env<AttrContext> localEnv =
1482 env.dup(tree, env.info.dup(env.info.scope.dup()));
1483 try {
1484 attribStats(tree.stats, localEnv);
1485 } finally {
1486 localEnv.info.scope.leave();
1487 }
1488 }
1489 result = null;
1490 }
1491
1492 public void visitDoLoop(JCDoWhileLoop tree) {
1493 attribStat(tree.body, env.dup(tree));
1494 attribExpr(tree.cond, env, syms.booleanType);
1495 if (!breaksOutOf(tree, tree.body)) {
1496 //include condition's body when false after the while, if cannot get out of the loop
1497 MatchBindings condBindings = matchBindings;
1498 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1499 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1500 }
1501 result = null;
1502 }
1503
1504 public void visitWhileLoop(JCWhileLoop tree) {
1505 attribExpr(tree.cond, env, syms.booleanType);
1506 MatchBindings condBindings = matchBindings;
1507 // include condition's bindings when true in the body:
1508 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1509 try {
1510 attribStat(tree.body, whileEnv.dup(tree));
1511 } finally {
1512 whileEnv.info.scope.leave();
1513 }
1514 if (!breaksOutOf(tree, tree.body)) {
1515 //include condition's bindings when false after the while, if cannot get out of the loop
1516 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1517 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1518 }
1519 result = null;
1520 }
1521
1522 private boolean breaksOutOf(JCTree loop, JCTree body) {
1523 preFlow(body);
1524 return flow.breaksOutOf(env, loop, body, make);
1525 }
1526
1527 public void visitWithField(JCWithField tree) {
1528 boolean inWithField = env.info.inWithField;
1529 try {
1530 env.info.inWithField = true;
1531 Type fieldtype = attribTree(tree.field, env.dup(tree), varAssignmentInfo);
1532 attribExpr(tree.value, env, fieldtype);
1533 Type capturedType = syms.errType;
1534 if (tree.field.type != null && !tree.field.type.isErroneous()) {
1535 final Symbol sym = TreeInfo.symbol(tree.field);
1536 if (sym == null || sym.kind != VAR || sym.owner.kind != TYP ||
1537 (sym.flags() & STATIC) != 0 || !sym.owner.isPrimitiveClass()) {
1538 log.error(tree.field.pos(), Errors.PrimitiveClassInstanceFieldExpectedHere);
1539 } else {
1540 Type ownType = sym.owner.type;
1541 switch(tree.field.getTag()) {
1542 case IDENT:
1543 JCIdent ident = (JCIdent) tree.field;
1544 ownType = ident.sym.owner.type;
1545 break;
1546 case SELECT:
1547 JCFieldAccess fieldAccess = (JCFieldAccess) tree.field;
1548 ownType = fieldAccess.selected.type;
1549 break;
1550 }
1551 // withfield always evaluates to the primitive value type.
1552 capturedType = capture(ownType.asValueType());
1553 }
1554 }
1555 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
1556 } finally {
1557 env.info.inWithField = inWithField;
1558 }
1559 }
1560
1561 public void visitForLoop(JCForLoop tree) {
1562 Env<AttrContext> loopEnv =
1563 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1564 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1565 try {
1566 attribStats(tree.init, loopEnv);
1567 if (tree.cond != null) {
1568 attribExpr(tree.cond, loopEnv, syms.booleanType);
1569 // include condition's bindings when true in the body and step:
1570 condBindings = matchBindings;
1571 }
1572 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1573 try {
1574 bodyEnv.tree = tree; // before, we were not in loop!
1575 attribStats(tree.step, bodyEnv);
1576 attribStat(tree.body, bodyEnv);
1577 } finally {
1578 bodyEnv.info.scope.leave();
1579 }
1580 result = null;
1581 }
1582 finally {
1583 loopEnv.info.scope.leave();
1584 }
1585 if (!breaksOutOf(tree, tree.body)) {
1586 //include condition's body when false after the while, if cannot get out of the loop
1587 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1588 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1589 }
1590 }
1591
1592 public void visitForeachLoop(JCEnhancedForLoop tree) {
1593 Env<AttrContext> loopEnv =
1594 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1595 try {
1596 //the Formal Parameter of a for-each loop is not in the scope when
1597 //attributing the for-each expression; we mimic this by attributing
1598 //the for-each expression first (against original scope).
1599 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1600 chk.checkNonVoid(tree.pos(), exprType);
1601 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1602 if (elemtype == null) {
1603 // or perhaps expr implements Iterable<T>?
1604 Type base = types.asSuper(exprType.referenceProjectionOrSelf(), syms.iterableType.tsym);
1605 if (base == null) {
1606 log.error(tree.expr.pos(),
1607 Errors.ForeachNotApplicableToType(exprType,
1608 Fragments.TypeReqArrayOrIterable));
1609 elemtype = types.createErrorType(exprType);
1610 } else {
1611 List<Type> iterableParams = base.allparams();
1612 elemtype = iterableParams.isEmpty()
1613 ? syms.objectType
1614 : types.wildUpperBound(iterableParams.head);
1615
1616 // Check the return type of the method iterator().
1617 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1618 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1619 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1620 if (types.asSuper(iterSymbol.type.getReturnType().referenceProjectionOrSelf(), syms.iteratorType.tsym) == null) {
1621 log.error(tree.pos(),
1622 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1623 }
1624 }
1625 }
1626 if (tree.var.isImplicitlyTyped()) {
1627 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1628 setSyntheticVariableType(tree.var, inferredType);
1629 }
1630 attribStat(tree.var, loopEnv);
1631 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1632 loopEnv.tree = tree; // before, we were not in loop!
1633 attribStat(tree.body, loopEnv);
1634 result = null;
1635 }
1636 finally {
1637 loopEnv.info.scope.leave();
1638 }
1639 }
1640
1641 public void visitLabelled(JCLabeledStatement tree) {
1642 // Check that label is not used in an enclosing statement
1643 Env<AttrContext> env1 = env;
1644 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1645 if (env1.tree.hasTag(LABELLED) &&
1646 ((JCLabeledStatement) env1.tree).label == tree.label) {
1647 log.error(tree.pos(),
1648 Errors.LabelAlreadyInUse(tree.label));
1649 break;
1650 }
1651 env1 = env1.next;
1652 }
1653
1654 attribStat(tree.body, env.dup(tree));
1655 result = null;
1656 }
1657
1658 public void visitSwitch(JCSwitch tree) {
1659 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1660 attribStats(c.stats, caseEnv);
1661 });
1662 result = null;
1663 }
1664
1665 public void visitSwitchExpression(JCSwitchExpression tree) {
1666 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1667 PolyKind.STANDALONE : PolyKind.POLY;
1668
1669 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1670 //this means we are returning a poly conditional from void-compatible lambda expression
1671 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1672 result = tree.type = types.createErrorType(resultInfo.pt);
1673 return;
1674 }
1675
1676 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1677 unknownExprInfo :
1678 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1679
1680 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1681 ListBuffer<Type> caseTypes = new ListBuffer<>();
1682
1683 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1684 caseEnv.info.yieldResult = condInfo;
1685 attribStats(c.stats, caseEnv);
1686 new TreeScanner() {
1687 @Override
1688 public void visitYield(JCYield brk) {
1689 if (brk.target == tree) {
1690 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1691 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1692 }
1693 super.visitYield(brk);
1694 }
1695
1696 @Override public void visitClassDef(JCClassDecl tree) {}
1697 @Override public void visitLambda(JCLambda tree) {}
1698 }.scan(c.stats);
1699 });
1700
1701 if (tree.cases.isEmpty()) {
1702 log.error(tree.pos(),
1703 Errors.SwitchExpressionEmpty);
1704 } else if (caseTypes.isEmpty()) {
1705 log.error(tree.pos(),
1706 Errors.SwitchExpressionNoResultExpressions);
1707 }
1708
1709 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1710
1711 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1712 }
1713 //where:
1714 CheckContext switchExpressionContext(CheckContext checkContext) {
1715 return new Check.NestedCheckContext(checkContext) {
1716 //this will use enclosing check context to check compatibility of
1717 //subexpression against target type; if we are in a method check context,
1718 //depending on whether boxing is allowed, we could have incompatibilities
1719 @Override
1720 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1721 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1722 }
1723 };
1724 }
1725
1726 private void handleSwitch(JCTree switchTree,
1727 JCExpression selector,
1728 List<JCCase> cases,
1729 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1730 Type seltype = attribExpr(selector, env);
1731
1732 Env<AttrContext> switchEnv =
1733 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1734
1735 try {
1736 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1737 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1738 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1739 boolean patternSwitch;
1740 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1741 !types.isAssignable(seltype, syms.intType)) {
1742 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1743 patternSwitch = true;
1744 } else {
1745 patternSwitch = cases.stream()
1746 .flatMap(c -> c.labels.stream())
1747 .anyMatch(l -> l.isPattern());
1748 }
1749
1750 // Attribute all cases and
1751 // check that there are no duplicate case labels or default clauses.
1752 Set<Object> labels = new HashSet<>(); // The set of case labels.
1753 List<Type> coveredTypes = List.nil();
1754 boolean hasDefault = false; // Is there a default label?
1755 boolean hasTotalPattern = false; // Is there a total pattern?
1756 boolean hasNullPattern = false; // Is there a null pattern?
1757 CaseTree.CaseKind caseKind = null;
1758 boolean wasError = false;
1759 MatchBindings prevBindings = null;
1760 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1761 JCCase c = l.head;
1762 if (caseKind == null) {
1763 caseKind = c.caseKind;
1764 } else if (caseKind != c.caseKind && !wasError) {
1765 log.error(c.pos(),
1766 Errors.SwitchMixingCaseTypes);
1767 wasError = true;
1768 }
1769 MatchBindings currentBindings = prevBindings;
1770 boolean wasTotalPattern = hasTotalPattern;
1771 for (JCCaseLabel pat : c.labels) {
1772 if (pat.isExpression()) {
1773 JCExpression expr = (JCExpression) pat;
1774 if (TreeInfo.isNull(expr)) {
1775 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1776 if (hasNullPattern) {
1777 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1778 } else if (wasTotalPattern) {
1779 log.error(pat.pos(), Errors.PatternDominated);
1780 }
1781 hasNullPattern = true;
1782 attribExpr(expr, switchEnv, seltype);
1783 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1784 } else if (enumSwitch) {
1785 Symbol sym = enumConstant(expr, seltype);
1786 if (sym == null) {
1787 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1788 } else if (!labels.add(sym)) {
1789 log.error(pat.pos(), Errors.DuplicateCaseLabel);
1790 } else {
1791 checkCaseLabelDominated(pat.pos(), coveredTypes, sym.type);
1792 }
1793 } else if (errorEnumSwitch) {
1794 //error recovery: the selector is erroneous, and all the case labels
1795 //are identifiers. This could be an enum switch - don't report resolve
1796 //error for the case label:
1797 var prevResolveHelper = rs.basicLogResolveHelper;
1798 try {
1799 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1800 attribExpr(pat, switchEnv, seltype);
1801 } finally {
1802 rs.basicLogResolveHelper = prevResolveHelper;
1803 }
1804 } else {
1805 ResultInfo valTypInfo = new ResultInfo(KindSelector.VAL_TYP,
1806 !seltype.hasTag(ERROR) ? seltype
1807 : Type.noType);
1808 Type pattype = attribTree(expr, switchEnv, valTypInfo);
1809 if (!pattype.hasTag(ERROR)) {
1810 if (pattype.constValue() == null) {
1811 Symbol s = TreeInfo.symbol(expr);
1812 if (s != null && s.kind == TYP && allowPatternSwitch) {
1813 log.error(expr.pos(),
1814 Errors.PatternExpected);
1815 } else {
1816 log.error(expr.pos(),
1817 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1818 }
1819 } else if (!stringSwitch && !types.isAssignable(seltype, syms.intType)) {
1820 log.error(pat.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1821 } else if (!labels.add(pattype.constValue())) {
1822 log.error(c.pos(), Errors.DuplicateCaseLabel);
1823 } else {
1824 checkCaseLabelDominated(pat.pos(), coveredTypes, types.boxedTypeOrType(pattype));
1825 }
1826 }
1827 }
1828 } else if (pat.hasTag(DEFAULTCASELABEL)) {
1829 if (hasDefault) {
1830 log.error(pat.pos(), Errors.DuplicateDefaultLabel);
1831 } else if (hasTotalPattern) {
1832 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1833 }
1834 hasDefault = true;
1835 matchBindings = MatchBindingsComputer.EMPTY;
1836 } else {
1837 //binding pattern
1838 attribExpr(pat, switchEnv);
1839 var primary = TreeInfo.primaryPatternType((JCPattern) pat);
1840 Type primaryType = primary.type();
1841 if (!primaryType.hasTag(TYPEVAR)) {
1842 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1843 }
1844 checkCastablePattern(pat.pos(), seltype, primaryType);
1845 Type patternType = types.erasure(primaryType);
1846 boolean isTotal = primary.unconditional() &&
1847 !patternType.isErroneous() &&
1848 types.isSubtype(types.erasure(seltype), patternType);
1849 if (isTotal) {
1850 if (hasTotalPattern) {
1851 log.error(pat.pos(), Errors.DuplicateTotalPattern);
1852 } else if (hasDefault) {
1853 log.error(pat.pos(), Errors.TotalPatternAndDefault);
1854 }
1855 hasTotalPattern = true;
1856 }
1857 checkCaseLabelDominated(pat.pos(), coveredTypes, patternType);
1858 if (primary.unconditional() && !patternType.isErroneous()) {
1859 coveredTypes = coveredTypes.prepend(patternType);
1860 }
1861 }
1862 currentBindings = matchBindingsComputer.switchCase(pat, currentBindings, matchBindings);
1863 }
1864 Env<AttrContext> caseEnv =
1865 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1866 try {
1867 attribCase.accept(c, caseEnv);
1868 } finally {
1869 caseEnv.info.scope.leave();
1870 }
1871 addVars(c.stats, switchEnv.info.scope);
1872
1873 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1874
1875 prevBindings = c.caseKind == CaseTree.CaseKind.STATEMENT && c.completesNormally ? currentBindings
1876 : null;
1877 }
1878 if (patternSwitch) {
1879 chk.checkSwitchCaseStructure(cases);
1880 }
1881 if (switchTree.hasTag(SWITCH)) {
1882 ((JCSwitch) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1883 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1884 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1885 ((JCSwitchExpression) switchTree).hasTotalPattern = hasDefault || hasTotalPattern;
1886 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1887 } else {
1888 Assert.error(switchTree.getTag().name());
1889 }
1890 } finally {
1891 switchEnv.info.scope.leave();
1892 }
1893 }
1894 // where
1895 /** Add any variables defined in stats to the switch scope. */
1896 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1897 for (;stats.nonEmpty(); stats = stats.tail) {
1898 JCTree stat = stats.head;
1899 if (stat.hasTag(VARDEF))
1900 switchScope.enter(((JCVariableDecl) stat).sym);
1901 }
1902 }
1903 private void checkCaseLabelDominated(DiagnosticPosition pos,
1904 List<Type> coveredTypes, Type patternType) {
1905 for (Type existing : coveredTypes) {
1906 if (types.isSubtype(patternType, existing)) {
1907 log.error(pos, Errors.PatternDominated);
1908 }
1909 }
1910 }
1911 // where
1912 /** Return the selected enumeration constant symbol, or null. */
1913 private Symbol enumConstant(JCTree tree, Type enumType) {
1914 if (tree.hasTag(IDENT)) {
1915 JCIdent ident = (JCIdent)tree;
1916 Name name = ident.name;
1917 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1918 if (sym.kind == VAR) {
1919 Symbol s = ident.sym = sym;
1920 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1921 ident.type = s.type;
1922 return ((s.flags_field & Flags.ENUM) == 0)
1923 ? null : s;
1924 }
1925 }
1926 }
1927 return null;
1928 }
1929
1930 public void visitSynchronized(JCSynchronized tree) {
1931 chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1932 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1933 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1934 }
1935 attribStat(tree.body, env);
1936 result = null;
1937 }
1938 // where
1939 private boolean isValueBased(Type t) {
1940 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1941 }
1942
1943
1944 public void visitTry(JCTry tree) {
1945 // Create a new local environment with a local
1946 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1947 try {
1948 boolean isTryWithResource = tree.resources.nonEmpty();
1949 // Create a nested environment for attributing the try block if needed
1950 Env<AttrContext> tryEnv = isTryWithResource ?
1951 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1952 localEnv;
1953 try {
1954 // Attribute resource declarations
1955 for (JCTree resource : tree.resources) {
1956 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1957 @Override
1958 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1959 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1960 }
1961 };
1962 ResultInfo twrResult =
1963 new ResultInfo(KindSelector.VAR,
1964 syms.autoCloseableType,
1965 twrContext);
1966 if (resource.hasTag(VARDEF)) {
1967 attribStat(resource, tryEnv);
1968 twrResult.check(resource, resource.type);
1969
1970 //check that resource type cannot throw InterruptedException
1971 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1972
1973 VarSymbol var = ((JCVariableDecl) resource).sym;
1974 var.setData(ElementKind.RESOURCE_VARIABLE);
1975 } else {
1976 attribTree(resource, tryEnv, twrResult);
1977 }
1978 }
1979 // Attribute body
1980 attribStat(tree.body, tryEnv);
1981 } finally {
1982 if (isTryWithResource)
1983 tryEnv.info.scope.leave();
1984 }
1985
1986 // Attribute catch clauses
1987 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1988 JCCatch c = l.head;
1989 Env<AttrContext> catchEnv =
1990 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1991 try {
1992 Type ctype = attribStat(c.param, catchEnv);
1993 if (TreeInfo.isMultiCatch(c)) {
1994 //multi-catch parameter is implicitly marked as final
1995 c.param.sym.flags_field |= FINAL | UNION;
1996 }
1997 if (c.param.sym.kind == VAR) {
1998 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1999 }
2000 chk.checkType(c.param.vartype.pos(),
2001 chk.checkClassType(c.param.vartype.pos(), ctype),
2002 syms.throwableType);
2003 attribStat(c.body, catchEnv);
2004 } finally {
2005 catchEnv.info.scope.leave();
2006 }
2007 }
2008
2009 // Attribute finalizer
2010 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2011 result = null;
2012 }
2013 finally {
2014 localEnv.info.scope.leave();
2015 }
2016 }
2017
2018 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2019 if (!resource.isErroneous() &&
2020 types.asSuper(resource.referenceProjectionOrSelf(), syms.autoCloseableType.tsym) != null &&
2021 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2022 Symbol close = syms.noSymbol;
2023 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2024 try {
2025 close = rs.resolveQualifiedMethod(pos,
2026 env,
2027 types.skipTypeVars(resource, false),
2028 names.close,
2029 List.nil(),
2030 List.nil());
2031 }
2032 finally {
2033 log.popDiagnosticHandler(discardHandler);
2034 }
2035 if (close.kind == MTH &&
2036 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2037 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2038 env.info.lint.isEnabled(LintCategory.TRY)) {
2039 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2040 }
2041 }
2042 }
2043
2044 public void visitConditional(JCConditional tree) {
2045 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2046 MatchBindings condBindings = matchBindings;
2047
2048 tree.polyKind = (!allowPoly ||
2049 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2050 isBooleanOrNumeric(env, tree)) ?
2051 PolyKind.STANDALONE : PolyKind.POLY;
2052
2053 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2054 //this means we are returning a poly conditional from void-compatible lambda expression
2055 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2056 result = tree.type = types.createErrorType(resultInfo.pt);
2057 return;
2058 }
2059
2060 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2061 unknownExprInfo :
2062 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2063
2064
2065 // x ? y : z
2066 // include x's bindings when true in y
2067 // include x's bindings when false in z
2068
2069 Type truetype;
2070 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2071 try {
2072 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2073 } finally {
2074 trueEnv.info.scope.leave();
2075 }
2076
2077 MatchBindings trueBindings = matchBindings;
2078
2079 Type falsetype;
2080 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2081 try {
2082 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2083 } finally {
2084 falseEnv.info.scope.leave();
2085 }
2086
2087 MatchBindings falseBindings = matchBindings;
2088
2089 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2090 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2091 List.of(truetype, falsetype)) : pt();
2092 if (condtype.constValue() != null &&
2093 truetype.constValue() != null &&
2094 falsetype.constValue() != null &&
2095 !owntype.hasTag(NONE)) {
2096 //constant folding
2097 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2098 }
2099 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2100 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2101 }
2102 //where
2103 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2104 switch (tree.getTag()) {
2105 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2106 ((JCLiteral)tree).typetag == BOOLEAN ||
2107 ((JCLiteral)tree).typetag == BOT;
2108 case LAMBDA: case REFERENCE: return false;
2109 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2110 case CONDEXPR:
2111 JCConditional condTree = (JCConditional)tree;
2112 return isBooleanOrNumeric(env, condTree.truepart) &&
2113 isBooleanOrNumeric(env, condTree.falsepart);
2114 case APPLY:
2115 JCMethodInvocation speculativeMethodTree =
2116 (JCMethodInvocation)deferredAttr.attribSpeculative(
2117 tree, env, unknownExprInfo,
2118 argumentAttr.withLocalCacheContext());
2119 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2120 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2121 env.enclClass.type :
2122 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2123 Type owntype = types.memberType(receiverType, msym).getReturnType();
2124 return primitiveOrBoxed(owntype);
2125 case NEWCLASS:
2126 JCExpression className =
2127 removeClassParams.translate(((JCNewClass)tree).clazz);
2128 JCExpression speculativeNewClassTree =
2129 (JCExpression)deferredAttr.attribSpeculative(
2130 className, env, unknownTypeInfo,
2131 argumentAttr.withLocalCacheContext());
2132 return primitiveOrBoxed(speculativeNewClassTree.type);
2133 default:
2134 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2135 argumentAttr.withLocalCacheContext()).type;
2136 return primitiveOrBoxed(speculativeType);
2137 }
2138 }
2139 //where
2140 boolean primitiveOrBoxed(Type t) {
2141 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2142 }
2143
2144 TreeTranslator removeClassParams = new TreeTranslator() {
2145 @Override
2146 public void visitTypeApply(JCTypeApply tree) {
2147 result = translate(tree.clazz);
2148 }
2149 };
2150
2151 CheckContext conditionalContext(CheckContext checkContext) {
2152 return new Check.NestedCheckContext(checkContext) {
2153 //this will use enclosing check context to check compatibility of
2154 //subexpression against target type; if we are in a method check context,
2155 //depending on whether boxing is allowed, we could have incompatibilities
2156 @Override
2157 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2158 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2159 }
2160 };
2161 }
2162
2163 /** Compute the type of a conditional expression, after
2164 * checking that it exists. See JLS 15.25. Does not take into
2165 * account the special case where condition and both arms
2166 * are constants.
2167 *
2168 * @param pos The source position to be used for error
2169 * diagnostics.
2170 * @param thentype The type of the expression's then-part.
2171 * @param elsetype The type of the expression's else-part.
2172 */
2173 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2174 if (condTypes.isEmpty()) {
2175 return syms.objectType; //TODO: how to handle?
2176 }
2177 Type first = condTypes.head;
2178 // If same type, that is the result
2179 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2180 return first.baseType();
2181
2182 List<Type> unboxedTypes = condTypes.stream()
2183 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2184 .collect(List.collector());
2185
2186 // Otherwise, if both arms can be converted to a numeric
2187 // type, return the least numeric type that fits both arms
2188 // (i.e. return larger of the two, or return int if one
2189 // arm is short, the other is char).
2190 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2191 // If one arm has an integer subrange type (i.e., byte,
2192 // short, or char), and the other is an integer constant
2193 // that fits into the subrange, return the subrange type.
2194 for (Type type : unboxedTypes) {
2195 if (!type.getTag().isStrictSubRangeOf(INT)) {
2196 continue;
2197 }
2198 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2199 return type.baseType();
2200 }
2201
2202 for (TypeTag tag : primitiveTags) {
2203 Type candidate = syms.typeOfTag[tag.ordinal()];
2204 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2205 return candidate;
2206 }
2207 }
2208 }
2209
2210 // Those were all the cases that could result in a primitive. See if primitive boxing and primitive
2211 // value conversions bring about a convergence.
2212 condTypes = condTypes.stream()
2213 .map(t -> t.isPrimitive() ? types.boxedClass(t).type
2214 : t.isPrimitiveReferenceType() ? t.asValueType() : t)
2215 .collect(List.collector());
2216
2217 for (Type type : condTypes) {
2218 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2219 return type.baseType();
2220 }
2221
2222 Iterator<DiagnosticPosition> posIt = positions.iterator();
2223
2224 condTypes = condTypes.stream()
2225 .map(t -> chk.checkNonVoid(posIt.next(), t.isPrimitiveClass() ? t.referenceProjection() : t))
2226 .collect(List.collector());
2227
2228 // both are known to be reference types (or projections). The result is
2229 // lub(thentype,elsetype). This cannot fail, as it will
2230 // always be possible to infer "Object" if nothing better.
2231 return types.lub(condTypes.stream()
2232 .map(t -> t.baseType())
2233 .filter(t -> !t.hasTag(BOT))
2234 .collect(List.collector()));
2235 }
2236
2237 static final TypeTag[] primitiveTags = new TypeTag[]{
2238 BYTE,
2239 CHAR,
2240 SHORT,
2241 INT,
2242 LONG,
2243 FLOAT,
2244 DOUBLE,
2245 BOOLEAN,
2246 };
2247
2248 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2249 return bindingEnv(env, env.tree, bindings);
2250 }
2251
2252 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2253 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2254 bindings.forEach(env1.info.scope::enter);
2255 return env1;
2256 }
2257
2258 public void visitIf(JCIf tree) {
2259 attribExpr(tree.cond, env, syms.booleanType);
2260
2261 // if (x) { y } [ else z ]
2262 // include x's bindings when true in y
2263 // include x's bindings when false in z
2264
2265 MatchBindings condBindings = matchBindings;
2266 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2267
2268 try {
2269 attribStat(tree.thenpart, thenEnv);
2270 } finally {
2271 thenEnv.info.scope.leave();
2272 }
2273
2274 preFlow(tree.thenpart);
2275 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2276 boolean aliveAfterElse;
2277
2278 if (tree.elsepart != null) {
2279 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2280 try {
2281 attribStat(tree.elsepart, elseEnv);
2282 } finally {
2283 elseEnv.info.scope.leave();
2284 }
2285 preFlow(tree.elsepart);
2286 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2287 } else {
2288 aliveAfterElse = true;
2289 }
2290
2291 chk.checkEmptyIf(tree);
2292
2293 List<BindingSymbol> afterIfBindings = List.nil();
2294
2295 if (aliveAfterThen && !aliveAfterElse) {
2296 afterIfBindings = condBindings.bindingsWhenTrue;
2297 } else if (aliveAfterElse && !aliveAfterThen) {
2298 afterIfBindings = condBindings.bindingsWhenFalse;
2299 }
2300
2301 afterIfBindings.forEach(env.info.scope::enter);
2302 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2303
2304 result = null;
2305 }
2306
2307 void preFlow(JCTree tree) {
2308 attrRecover.doRecovery();
2309 new PostAttrAnalyzer() {
2310 @Override
2311 public void scan(JCTree tree) {
2312 if (tree == null ||
2313 (tree.type != null &&
2314 tree.type == Type.stuckType)) {
2315 //don't touch stuck expressions!
2316 return;
2317 }
2318 super.scan(tree);
2319 }
2320
2321 @Override
2322 public void visitClassDef(JCClassDecl that) {
2323 if (that.sym != null) {
2324 // Method preFlow shouldn't visit class definitions
2325 // that have not been entered and attributed.
2326 // See JDK-8254557 and JDK-8203277 for more details.
2327 super.visitClassDef(that);
2328 }
2329 }
2330
2331 @Override
2332 public void visitLambda(JCLambda that) {
2333 if (that.type != null) {
2334 // Method preFlow shouldn't visit lambda expressions
2335 // that have not been entered and attributed.
2336 // See JDK-8254557 and JDK-8203277 for more details.
2337 super.visitLambda(that);
2338 }
2339 }
2340 }.scan(tree);
2341 }
2342
2343 public void visitExec(JCExpressionStatement tree) {
2344 //a fresh environment is required for 292 inference to work properly ---
2345 //see Infer.instantiatePolymorphicSignatureInstance()
2346 Env<AttrContext> localEnv = env.dup(tree);
2347 attribExpr(tree.expr, localEnv);
2348 result = null;
2349 }
2350
2351 public void visitBreak(JCBreak tree) {
2352 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2353 result = null;
2354 }
2355
2356 public void visitYield(JCYield tree) {
2357 if (env.info.yieldResult != null) {
2358 attribTree(tree.value, env, env.info.yieldResult);
2359 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2360 } else {
2361 log.error(tree.pos(), tree.value.hasTag(PARENS)
2362 ? Errors.NoSwitchExpressionQualify
2363 : Errors.NoSwitchExpression);
2364 attribTree(tree.value, env, unknownExprInfo);
2365 }
2366 result = null;
2367 }
2368
2369 public void visitContinue(JCContinue tree) {
2370 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2371 result = null;
2372 }
2373 //where
2374 /** Return the target of a break, continue or yield statement,
2375 * if it exists, report an error if not.
2376 * Note: The target of a labelled break or continue is the
2377 * (non-labelled) statement tree referred to by the label,
2378 * not the tree representing the labelled statement itself.
2379 *
2380 * @param pos The position to be used for error diagnostics
2381 * @param tag The tag of the jump statement. This is either
2382 * Tree.BREAK or Tree.CONTINUE.
2383 * @param label The label of the jump statement, or null if no
2384 * label is given.
2385 * @param env The environment current at the jump statement.
2386 */
2387 private JCTree findJumpTarget(DiagnosticPosition pos,
2388 JCTree.Tag tag,
2389 Name label,
2390 Env<AttrContext> env) {
2391 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2392
2393 if (jumpTarget.snd != null) {
2394 log.error(pos, jumpTarget.snd);
2395 }
2396
2397 return jumpTarget.fst;
2398 }
2399 /** Return the target of a break or continue statement, if it exists,
2400 * report an error if not.
2401 * Note: The target of a labelled break or continue is the
2402 * (non-labelled) statement tree referred to by the label,
2403 * not the tree representing the labelled statement itself.
2404 *
2405 * @param tag The tag of the jump statement. This is either
2406 * Tree.BREAK or Tree.CONTINUE.
2407 * @param label The label of the jump statement, or null if no
2408 * label is given.
2409 * @param env The environment current at the jump statement.
2410 */
2411 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2412 Name label,
2413 Env<AttrContext> env) {
2414 // Search environments outwards from the point of jump.
2415 Env<AttrContext> env1 = env;
2416 JCDiagnostic.Error pendingError = null;
2417 LOOP:
2418 while (env1 != null) {
2419 switch (env1.tree.getTag()) {
2420 case LABELLED:
2421 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2422 if (label == labelled.label) {
2423 // If jump is a continue, check that target is a loop.
2424 if (tag == CONTINUE) {
2425 if (!labelled.body.hasTag(DOLOOP) &&
2426 !labelled.body.hasTag(WHILELOOP) &&
2427 !labelled.body.hasTag(FORLOOP) &&
2428 !labelled.body.hasTag(FOREACHLOOP)) {
2429 pendingError = Errors.NotLoopLabel(label);
2430 }
2431 // Found labelled statement target, now go inwards
2432 // to next non-labelled tree.
2433 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2434 } else {
2435 return Pair.of(labelled, pendingError);
2436 }
2437 }
2438 break;
2439 case DOLOOP:
2440 case WHILELOOP:
2441 case FORLOOP:
2442 case FOREACHLOOP:
2443 if (label == null) return Pair.of(env1.tree, pendingError);
2444 break;
2445 case SWITCH:
2446 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2447 break;
2448 case SWITCH_EXPRESSION:
2449 if (tag == YIELD) {
2450 return Pair.of(env1.tree, null);
2451 } else if (tag == BREAK) {
2452 pendingError = Errors.BreakOutsideSwitchExpression;
2453 } else {
2454 pendingError = Errors.ContinueOutsideSwitchExpression;
2455 }
2456 break;
2457 case LAMBDA:
2458 case METHODDEF:
2459 case CLASSDEF:
2460 break LOOP;
2461 default:
2462 }
2463 env1 = env1.next;
2464 }
2465 if (label != null)
2466 return Pair.of(null, Errors.UndefLabel(label));
2467 else if (pendingError != null)
2468 return Pair.of(null, pendingError);
2469 else if (tag == CONTINUE)
2470 return Pair.of(null, Errors.ContOutsideLoop);
2471 else
2472 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2473 }
2474
2475 public void visitReturn(JCReturn tree) {
2476 // Check that there is an enclosing method which is
2477 // nested within than the enclosing class.
2478 if (env.info.returnResult == null) {
2479 log.error(tree.pos(), Errors.RetOutsideMeth);
2480 } else if (env.info.yieldResult != null) {
2481 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2482 } else if (!env.info.isLambda &&
2483 !env.info.isNewClass &&
2484 env.enclMethod != null &&
2485 TreeInfo.isCompactConstructor(env.enclMethod)) {
2486 log.error(env.enclMethod,
2487 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2488 } else {
2489 // Attribute return expression, if it exists, and check that
2490 // it conforms to result type of enclosing method.
2491 if (tree.expr != null) {
2492 if (env.info.returnResult.pt.hasTag(VOID)) {
2493 env.info.returnResult.checkContext.report(tree.expr.pos(),
2494 diags.fragment(Fragments.UnexpectedRetVal));
2495 }
2496 attribTree(tree.expr, env, env.info.returnResult);
2497 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2498 !env.info.returnResult.pt.hasTag(NONE)) {
2499 env.info.returnResult.checkContext.report(tree.pos(),
2500 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2501 }
2502 }
2503 result = null;
2504 }
2505
2506 public void visitThrow(JCThrow tree) {
2507 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
2508 if (allowPoly) {
2509 chk.checkType(tree, owntype, syms.throwableType);
2510 }
2511 result = null;
2512 }
2513
2514 public void visitAssert(JCAssert tree) {
2515 attribExpr(tree.cond, env, syms.booleanType);
2516 if (tree.detail != null) {
2517 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2518 }
2519 result = null;
2520 }
2521
2522 /** Visitor method for method invocations.
2523 * NOTE: The method part of an application will have in its type field
2524 * the return type of the method, not the method's type itself!
2525 */
2526 public void visitApply(JCMethodInvocation tree) {
2527 // The local environment of a method application is
2528 // a new environment nested in the current one.
2529 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2530
2531 // The types of the actual method arguments.
2532 List<Type> argtypes;
2533
2534 // The types of the actual method type arguments.
2535 List<Type> typeargtypes = null;
2536
2537 Name methName = TreeInfo.name(tree.meth);
2538
2539 boolean isConstructorCall =
2540 methName == names._this || methName == names._super;
2541
2542 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2543 if (isConstructorCall) {
2544 // We are seeing a ...this(...) or ...super(...) call.
2545 // Check that this is the first statement in a constructor.
2546 checkFirstConstructorStat(tree, env.enclMethod, true);
2547
2548 // Record the fact
2549 // that this is a constructor call (using isSelfCall).
2550 localEnv.info.isSelfCall = true;
2551
2552 // Attribute arguments, yielding list of argument types.
2553 localEnv.info.constructorArgs = true;
2554 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2555 localEnv.info.constructorArgs = false;
2556 argtypes = argtypesBuf.toList();
2557 typeargtypes = attribTypes(tree.typeargs, localEnv);
2558
2559 // Variable `site' points to the class in which the called
2560 // constructor is defined.
2561 Type site = env.enclClass.sym.type;
2562 if (methName == names._super) {
2563 if (site == syms.objectType) {
2564 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2565 site = types.createErrorType(syms.objectType);
2566 } else {
2567 site = types.supertype(site);
2568 }
2569 }
2570
2571 if (site.hasTag(CLASS)) {
2572 Type encl = site.getEnclosingType();
2573 while (encl != null && encl.hasTag(TYPEVAR))
2574 encl = encl.getUpperBound();
2575 if (encl.hasTag(CLASS)) {
2576 // we are calling a nested class
2577
2578 if (tree.meth.hasTag(SELECT)) {
2579 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2580
2581 // We are seeing a prefixed call, of the form
2582 // <expr>.super(...).
2583 // Check that the prefix expression conforms
2584 // to the outer instance type of the class.
2585 chk.checkRefType(qualifier.pos(),
2586 attribExpr(qualifier, localEnv,
2587 encl));
2588 } else if (methName == names._super) {
2589 // qualifier omitted; check for existence
2590 // of an appropriate implicit qualifier.
2591 rs.resolveImplicitThis(tree.meth.pos(),
2592 localEnv, site, true);
2593 }
2594 } else if (tree.meth.hasTag(SELECT)) {
2595 log.error(tree.meth.pos(),
2596 Errors.IllegalQualNotIcls(site.tsym));
2597 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2598 }
2599
2600 // if we're calling a java.lang.Enum constructor,
2601 // prefix the implicit String and int parameters
2602 if (site.tsym == syms.enumSym)
2603 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2604
2605 // Resolve the called constructor under the assumption
2606 // that we are referring to a superclass instance of the
2607 // current instance (JLS ???).
2608 boolean selectSuperPrev = localEnv.info.selectSuper;
2609 localEnv.info.selectSuper = true;
2610 localEnv.info.pendingResolutionPhase = null;
2611 Symbol sym = rs.resolveConstructor(
2612 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2613 localEnv.info.selectSuper = selectSuperPrev;
2614
2615 // Set method symbol to resolved constructor...
2616 TreeInfo.setSymbol(tree.meth, sym);
2617
2618 // ...and check that it is legal in the current context.
2619 // (this will also set the tree's type)
2620 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2621 checkId(tree.meth, site, sym, localEnv,
2622 new ResultInfo(kind, mpt));
2623 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2624 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2625 }
2626 // Otherwise, `site' is an error type and we do nothing
2627 result = tree.type = syms.voidType;
2628 } else {
2629 // Otherwise, we are seeing a regular method call.
2630 // Attribute the arguments, yielding list of argument types, ...
2631 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2632 argtypes = argtypesBuf.toList();
2633 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2634
2635 // ... and attribute the method using as a prototype a methodtype
2636 // whose formal argument types is exactly the list of actual
2637 // arguments (this will also set the method symbol).
2638 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2639 localEnv.info.pendingResolutionPhase = null;
2640 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2641
2642 // Compute the result type.
2643 Type restype = mtype.getReturnType();
2644 if (restype.hasTag(WILDCARD))
2645 throw new AssertionError(mtype);
2646
2647 Type qualifier = (tree.meth.hasTag(SELECT))
2648 ? ((JCFieldAccess) tree.meth).selected.type
2649 : env.enclClass.sym.type;
2650 Symbol msym = TreeInfo.symbol(tree.meth);
2651 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2652
2653 chk.checkRefTypes(tree.typeargs, typeargtypes);
2654
2655 final Symbol symbol = TreeInfo.symbol(tree.meth);
2656 if (symbol != null) {
2657 /* Is this an ill conceived attempt to invoke jlO methods not available on primitive class types ??
2658 */
2659 boolean superCallOnPrimitiveReceiver = env.enclClass.sym.isPrimitiveClass()
2660 && (tree.meth.hasTag(SELECT))
2661 && ((JCFieldAccess)tree.meth).selected.hasTag(IDENT)
2662 && TreeInfo.name(((JCFieldAccess)tree.meth).selected) == names._super;
2663 if (qualifier.tsym.isPrimitiveClass() || superCallOnPrimitiveReceiver) {
2664 int argSize = argtypes.size();
2665 Name name = symbol.name;
2666 switch (name.toString()) {
2667 case "wait":
2668 if (argSize == 0
2669 || (types.isConvertible(argtypes.head, syms.longType) &&
2670 (argSize == 1 || (argSize == 2 && types.isConvertible(argtypes.tail.head, syms.intType))))) {
2671 log.error(tree.pos(), Errors.PrimitiveClassDoesNotSupport(name));
2672 }
2673 break;
2674 case "notify":
2675 case "notifyAll":
2676 case "clone":
2677 case "finalize":
2678 if (argSize == 0)
2679 log.error(tree.pos(), Errors.PrimitiveClassDoesNotSupport(name));
2680 break;
2681 }
2682 }
2683 }
2684
2685 // Check that value of resulting type is admissible in the
2686 // current context. Also, capture the return type
2687 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2688 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2689 }
2690 chk.validate(tree.typeargs, localEnv);
2691 }
2692 //where
2693 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2694 if (msym != null &&
2695 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2696 methodName == names.getClass &&
2697 argtypes.isEmpty()) {
2698 // as a special case, x.getClass() has type Class<? extends |X|>
2699 // Special treatment for primitive classes: Given an expression v of type V where
2700 // V is a primitive class, v.getClass() is typed to be Class<? extends |V.ref|>
2701 Type wcb = types.erasure(qualifierType.isPrimitiveClass() ?
2702 qualifierType.referenceProjection() : qualifierType);
2703 return new ClassType(restype.getEnclosingType(),
2704 List.of(new WildcardType(wcb,
2705 BoundKind.EXTENDS,
2706 syms.boundClass)),
2707 restype.tsym,
2708 restype.getMetadata(),
2709 restype.getFlavor());
2710 } else if (msym != null &&
2711 msym.owner == syms.arrayClass &&
2712 methodName == names.clone &&
2713 types.isArray(qualifierType)) {
2714 // as a special case, array.clone() has a result that is
2715 // the same as static type of the array being cloned
2716 return qualifierType;
2717 } else {
2718 return restype;
2719 }
2720 }
2721
2722 /** Check that given application node appears as first statement
2723 * in a constructor call.
2724 * @param tree The application node
2725 * @param enclMethod The enclosing method of the application.
2726 * @param error Should an error be issued?
2727 */
2728 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2729 if (enclMethod != null && enclMethod.name == names.init) {
2730 JCBlock body = enclMethod.body;
2731 if (body.stats.head.hasTag(EXEC) &&
2732 ((JCExpressionStatement) body.stats.head).expr == tree)
2733 return true;
2734 }
2735 if (error) {
2736 log.error(tree.pos(),
2737 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2738 }
2739 return false;
2740 }
2741
2742 /** Obtain a method type with given argument types.
2743 */
2744 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2745 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2746 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2747 }
2748
2749 public void visitNewClass(final JCNewClass tree) {
2750 Type owntype = types.createErrorType(tree.type);
2751
2752 // The local environment of a class creation is
2753 // a new environment nested in the current one.
2754 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2755
2756 // The anonymous inner class definition of the new expression,
2757 // if one is defined by it.
2758 JCClassDecl cdef = tree.def;
2759
2760 // If enclosing class is given, attribute it, and
2761 // complete class name to be fully qualified
2762 JCExpression clazz = tree.clazz; // Class field following new
2763 JCExpression clazzid; // Identifier in class field
2764 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2765 annoclazzid = null;
2766
2767 if (clazz.hasTag(TYPEAPPLY)) {
2768 clazzid = ((JCTypeApply) clazz).clazz;
2769 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2770 annoclazzid = (JCAnnotatedType) clazzid;
2771 clazzid = annoclazzid.underlyingType;
2772 }
2773 } else {
2774 if (clazz.hasTag(ANNOTATED_TYPE)) {
2775 annoclazzid = (JCAnnotatedType) clazz;
2776 clazzid = annoclazzid.underlyingType;
2777 } else {
2778 clazzid = clazz;
2779 }
2780 }
2781
2782 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2783
2784 if (tree.encl != null) {
2785 // We are seeing a qualified new, of the form
2786 // <expr>.new C <...> (...) ...
2787 // In this case, we let clazz stand for the name of the
2788 // allocated class C prefixed with the type of the qualifier
2789 // expression, so that we can
2790 // resolve it with standard techniques later. I.e., if
2791 // <expr> has type T, then <expr>.new C <...> (...)
2792 // yields a clazz T.C.
2793 Type encltype = chk.checkRefType(tree.encl.pos(),
2794 attribExpr(tree.encl, env));
2795 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2796 // from expr to the combined type, or not? Yes, do this.
2797 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2798 ((JCIdent) clazzid).name);
2799
2800 EndPosTable endPosTable = this.env.toplevel.endPositions;
2801 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2802 if (clazz.hasTag(ANNOTATED_TYPE)) {
2803 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2804 List<JCAnnotation> annos = annoType.annotations;
2805
2806 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2807 clazzid1 = make.at(tree.pos).
2808 TypeApply(clazzid1,
2809 ((JCTypeApply) clazz).arguments);
2810 }
2811
2812 clazzid1 = make.at(tree.pos).
2813 AnnotatedType(annos, clazzid1);
2814 } else if (clazz.hasTag(TYPEAPPLY)) {
2815 clazzid1 = make.at(tree.pos).
2816 TypeApply(clazzid1,
2817 ((JCTypeApply) clazz).arguments);
2818 }
2819
2820 clazz = clazzid1;
2821 }
2822
2823 // Attribute clazz expression and store
2824 // symbol + type back into the attributed tree.
2825 Type clazztype;
2826
2827 try {
2828 env.info.isNewClass = true;
2829 clazztype = TreeInfo.isEnumInit(env.tree) ?
2830 attribIdentAsEnumType(env, (JCIdent)clazz) :
2831 attribType(clazz, env);
2832 if (clazztype.tsym == syms.objectType.tsym && cdef == null && !tree.classDeclRemoved()) {
2833 log.note(tree.pos(), Notes.CantInstantiateObjectDirectly);
2834 }
2835 } finally {
2836 env.info.isNewClass = false;
2837 }
2838
2839 clazztype = chk.checkDiamond(tree, clazztype);
2840 chk.validate(clazz, localEnv);
2841 if (tree.encl != null) {
2842 // We have to work in this case to store
2843 // symbol + type back into the attributed tree.
2844 tree.clazz.type = clazztype;
2845 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2846 clazzid.type = ((JCIdent) clazzid).sym.type;
2847 if (annoclazzid != null) {
2848 annoclazzid.type = clazzid.type;
2849 }
2850 if (!clazztype.isErroneous()) {
2851 if (cdef != null && clazztype.tsym.isInterface()) {
2852 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2853 } else if (clazztype.tsym.isStatic()) {
2854 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2855 }
2856 }
2857 } else if (!clazztype.tsym.isInterface() &&
2858 clazztype.getEnclosingType().hasTag(CLASS)) {
2859 // Check for the existence of an apropos outer instance
2860 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2861 }
2862
2863 // Attribute constructor arguments.
2864 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2865 final KindSelector pkind =
2866 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2867 List<Type> argtypes = argtypesBuf.toList();
2868 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2869
2870 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2871 // Enums may not be instantiated except implicitly
2872 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2873 (!env.tree.hasTag(VARDEF) ||
2874 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2875 ((JCVariableDecl) env.tree).init != tree))
2876 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2877
2878 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2879 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2880 boolean skipNonDiamondPath = false;
2881 // Check that it is an instantiation of a class and not a projection type
2882 JCExpression instantiation = clazz;
2883 if (instantiation.hasTag(TYPEAPPLY))
2884 instantiation = ((JCTypeApply) instantiation).clazz;
2885 if (instantiation.hasTag(SELECT)) {
2886 JCFieldAccess fieldAccess = (JCFieldAccess) instantiation;
2887 if (fieldAccess.selected.type.tsym.isPrimitiveClass() &&
2888 (fieldAccess.name == names.ref || fieldAccess.name == names.val)) {
2889 log.error(tree.pos(), Errors.ProjectionCantBeInstantiated);
2890 }
2891 }
2892 // Check that class is not abstract
2893 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2894 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2895 log.error(tree.pos(),
2896 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2897 skipNonDiamondPath = true;
2898 } else if (cdef != null && clazztype.tsym.isInterface()) {
2899 // Check that no constructor arguments are given to
2900 // anonymous classes implementing an interface
2901 if (!argtypes.isEmpty())
2902 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2903
2904 if (!typeargtypes.isEmpty())
2905 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2906
2907 // Error recovery: pretend no arguments were supplied.
2908 argtypes = List.nil();
2909 typeargtypes = List.nil();
2910 skipNonDiamondPath = true;
2911 }
2912 if (TreeInfo.isDiamond(tree)) {
2913 ClassType site = new ClassType(clazztype.getEnclosingType(),
2914 clazztype.tsym.type.getTypeArguments(),
2915 clazztype.tsym,
2916 clazztype.getMetadata(),
2917 clazztype.getFlavor());
2918
2919 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2920 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2921 diamondEnv.info.pendingResolutionPhase = null;
2922
2923 //if the type of the instance creation expression is a class type
2924 //apply method resolution inference (JLS 15.12.2.7). The return type
2925 //of the resolved constructor will be a partially instantiated type
2926 Symbol constructor = rs.resolveDiamond(tree.pos(),
2927 diamondEnv,
2928 site,
2929 argtypes,
2930 typeargtypes);
2931 tree.constructor = constructor.baseSymbol();
2932
2933 final TypeSymbol csym = clazztype.tsym;
2934 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2935 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2936 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2937 constructorType = checkId(tree, site,
2938 constructor,
2939 diamondEnv,
2940 diamondResult);
2941
2942 tree.clazz.type = types.createErrorType(clazztype);
2943 if (!constructorType.isErroneous()) {
2944 tree.clazz.type = clazz.type = constructorType.getReturnType();
2945 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2946 }
2947 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2948 }
2949
2950 // Resolve the called constructor under the assumption
2951 // that we are referring to a superclass instance of the
2952 // current instance (JLS ???).
2953 else if (!skipNonDiamondPath) {
2954 //the following code alters some of the fields in the current
2955 //AttrContext - hence, the current context must be dup'ed in
2956 //order to avoid downstream failures
2957 Env<AttrContext> rsEnv = localEnv.dup(tree);
2958 rsEnv.info.selectSuper = cdef != null;
2959 rsEnv.info.pendingResolutionPhase = null;
2960 tree.constructor = rs.resolveConstructor(
2961 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2962 if (cdef == null) { //do not check twice!
2963 tree.constructorType = checkId(tree,
2964 clazztype,
2965 tree.constructor,
2966 rsEnv,
2967 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2968 if (rsEnv.info.lastResolveVarargs())
2969 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2970 }
2971 }
2972
2973 if (cdef != null) {
2974 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2975 return;
2976 }
2977
2978 if (tree.constructor != null && tree.constructor.kind == MTH)
2979 owntype = clazztype;
2980 }
2981 // For primitive classes construction always returns the value type.
2982 if (owntype.tsym.isPrimitiveClass()) {
2983 owntype = owntype.asValueType();
2984 }
2985 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2986 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2987 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2988 //we need to wait for inference to finish and then replace inference vars in the constructor type
2989 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2990 instantiatedContext -> {
2991 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2992 });
2993 }
2994 chk.validate(tree.typeargs, localEnv);
2995 }
2996
2997 // where
2998 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2999 JCClassDecl cdef, Env<AttrContext> localEnv,
3000 List<Type> argtypes, List<Type> typeargtypes,
3001 KindSelector pkind) {
3002 // We are seeing an anonymous class instance creation.
3003 // In this case, the class instance creation
3004 // expression
3005 //
3006 // E.new <typeargs1>C<typargs2>(args) { ... }
3007 //
3008 // is represented internally as
3009 //
3010 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
3011 //
3012 // This expression is then *transformed* as follows:
3013 //
3014 // (1) add an extends or implements clause
3015 // (2) add a constructor.
3016 //
3017 // For instance, if C is a class, and ET is the type of E,
3018 // the expression
3019 //
3020 // E.new <typeargs1>C<typargs2>(args) { ... }
3021 //
3022 // is translated to (where X is a fresh name and typarams is the
3023 // parameter list of the super constructor):
3024 //
3025 // new <typeargs1>X(<*nullchk*>E, args) where
3026 // X extends C<typargs2> {
3027 // <typarams> X(ET e, args) {
3028 // e.<typeargs1>super(args)
3029 // }
3030 // ...
3031 // }
3032 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3033 final boolean isDiamond = TreeInfo.isDiamond(tree);
3034 if (isDiamond
3035 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3036 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3037 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3038 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3039 instantiatedContext -> {
3040 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3041 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3042 ResultInfo prevResult = this.resultInfo;
3043 try {
3044 this.resultInfo = resultInfoForClassDefinition;
3045 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3046 localEnv, argtypes, typeargtypes, pkind);
3047 } finally {
3048 this.resultInfo = prevResult;
3049 }
3050 });
3051 } else {
3052 if (isDiamond && clazztype.hasTag(CLASS)) {
3053 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3054 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3055 // One or more types inferred in the previous steps is non-denotable.
3056 Fragment fragment = Diamond(clazztype.tsym);
3057 log.error(tree.clazz.pos(),
3058 Errors.CantApplyDiamond1(
3059 fragment,
3060 invalidDiamondArgs.size() > 1 ?
3061 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3062 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3063 }
3064 // For <>(){}, inferred types must also be accessible.
3065 for (Type t : clazztype.getTypeArguments()) {
3066 rs.checkAccessibleType(env, t);
3067 }
3068 chk.checkParameterizationByPrimitiveClass(tree, clazztype);
3069 }
3070
3071 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3072 // false for isInterface call even when the original type is an interface.
3073 boolean implementing = clazztype.tsym.isInterface() ||
3074 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3075 clazztype.getOriginalType().tsym.isInterface();
3076
3077 if (implementing) {
3078 cdef.implementing = List.of(clazz);
3079 } else {
3080 cdef.extending = clazz;
3081 }
3082
3083 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3084 isSerializable(clazztype)) {
3085 localEnv.info.isSerializable = true;
3086 }
3087
3088 attribStat(cdef, localEnv);
3089
3090 List<Type> finalargtypes;
3091 // If an outer instance is given,
3092 // prefix it to the constructor arguments
3093 // and delete it from the new expression
3094 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3095 finalargtypes = argtypes.prepend(tree.encl.type);
3096 } else {
3097 finalargtypes = argtypes;
3098 }
3099
3100 // Reassign clazztype and recompute constructor. As this necessarily involves
3101 // another attribution pass for deferred types in the case of <>, replicate
3102 // them. Original arguments have right decorations already.
3103 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3104 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3105 }
3106
3107 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3108 : cdef.sym.type;
3109 Symbol sym = tree.constructor = rs.resolveConstructor(
3110 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3111 Assert.check(!sym.kind.isResolutionError());
3112 tree.constructor = sym;
3113 tree.constructorType = checkId(tree,
3114 clazztype,
3115 tree.constructor,
3116 localEnv,
3117 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3118 }
3119 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3120 clazztype : types.createErrorType(tree.type);
3121 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3122 chk.validate(tree.typeargs, localEnv);
3123 }
3124
3125 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3126 return new Check.NestedCheckContext(checkContext) {
3127 @Override
3128 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3129 enclosingContext.report(clazz.clazz,
3130 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3131 }
3132 };
3133 }
3134
3135 /** Make an attributed null check tree.
3136 */
3137 public JCExpression makeNullCheck(JCExpression arg) {
3138 // optimization: new Outer() can never be null; skip null check
3139 if (arg.getTag() == NEWCLASS)
3140 return arg;
3141 // Likewise arg can't be null if it is a primitive class instance.
3142 if (types.isPrimitiveClass(arg.type))
3143 return arg;
3144 // optimization: X.this is never null; skip null check
3145 Name name = TreeInfo.name(arg);
3146 if (name == names._this || name == names._super) return arg;
3147
3148 JCTree.Tag optag = NULLCHK;
3149 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3150 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3151 tree.type = arg.type;
3152 return tree;
3153 }
3154
3155 public void visitNewArray(JCNewArray tree) {
3156 Type owntype = types.createErrorType(tree.type);
3157 Env<AttrContext> localEnv = env.dup(tree);
3158 Type elemtype;
3159 if (tree.elemtype != null) {
3160 elemtype = attribType(tree.elemtype, localEnv);
3161 chk.validate(tree.elemtype, localEnv);
3162 owntype = elemtype;
3163 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3164 attribExpr(l.head, localEnv, syms.intType);
3165 owntype = new ArrayType(owntype, syms.arrayClass);
3166 }
3167 } else {
3168 // we are seeing an untyped aggregate { ... }
3169 // this is allowed only if the prototype is an array
3170 if (pt().hasTag(ARRAY)) {
3171 elemtype = types.elemtype(pt());
3172 } else {
3173 if (!pt().hasTag(ERROR) &&
3174 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3175 log.error(tree.pos(),
3176 Errors.IllegalInitializerForType(pt()));
3177 }
3178 elemtype = types.createErrorType(pt());
3179 }
3180 }
3181 if (tree.elems != null) {
3182 attribExprs(tree.elems, localEnv, elemtype);
3183 owntype = new ArrayType(elemtype, syms.arrayClass);
3184 }
3185 if (!types.isReifiable(elemtype))
3186 log.error(tree.pos(), Errors.GenericArrayCreation);
3187 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3188 }
3189
3190 /*
3191 * A lambda expression can only be attributed when a target-type is available.
3192 * In addition, if the target-type is that of a functional interface whose
3193 * descriptor contains inference variables in argument position the lambda expression
3194 * is 'stuck' (see DeferredAttr).
3195 */
3196 @Override
3197 public void visitLambda(final JCLambda that) {
3198 boolean wrongContext = false;
3199 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3200 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3201 //lambda only allowed in assignment or method invocation/cast context
3202 log.error(that.pos(), Errors.UnexpectedLambda);
3203 }
3204 resultInfo = recoveryInfo;
3205 wrongContext = true;
3206 }
3207 //create an environment for attribution of the lambda expression
3208 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3209 boolean needsRecovery =
3210 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3211 try {
3212 if (needsRecovery && isSerializable(pt())) {
3213 localEnv.info.isSerializable = true;
3214 localEnv.info.isSerializableLambda = true;
3215 }
3216 List<Type> explicitParamTypes = null;
3217 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3218 //attribute lambda parameters
3219 attribStats(that.params, localEnv);
3220 explicitParamTypes = TreeInfo.types(that.params);
3221 }
3222
3223 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3224 Type currentTarget = targetInfo.target;
3225 Type lambdaType = targetInfo.descriptor;
3226
3227 if (currentTarget.isErroneous()) {
3228 result = that.type = currentTarget;
3229 return;
3230 }
3231
3232 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3233
3234 if (lambdaType.hasTag(FORALL)) {
3235 //lambda expression target desc cannot be a generic method
3236 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3237 kindName(currentTarget.tsym),
3238 currentTarget.tsym);
3239 resultInfo.checkContext.report(that, diags.fragment(msg));
3240 result = that.type = types.createErrorType(pt());
3241 return;
3242 }
3243
3244 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3245 //add param type info in the AST
3246 List<Type> actuals = lambdaType.getParameterTypes();
3247 List<JCVariableDecl> params = that.params;
3248
3249 boolean arityMismatch = false;
3250
3251 while (params.nonEmpty()) {
3252 if (actuals.isEmpty()) {
3253 //not enough actuals to perform lambda parameter inference
3254 arityMismatch = true;
3255 }
3256 //reset previously set info
3257 Type argType = arityMismatch ?
3258 syms.errType :
3259 actuals.head;
3260 if (params.head.isImplicitlyTyped()) {
3261 setSyntheticVariableType(params.head, argType);
3262 }
3263 params.head.sym = null;
3264 actuals = actuals.isEmpty() ?
3265 actuals :
3266 actuals.tail;
3267 params = params.tail;
3268 }
3269
3270 //attribute lambda parameters
3271 attribStats(that.params, localEnv);
3272
3273 if (arityMismatch) {
3274 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3275 result = that.type = types.createErrorType(currentTarget);
3276 return;
3277 }
3278 }
3279
3280 //from this point on, no recovery is needed; if we are in assignment context
3281 //we will be able to attribute the whole lambda body, regardless of errors;
3282 //if we are in a 'check' method context, and the lambda is not compatible
3283 //with the target-type, it will be recovered anyway in Attr.checkId
3284 needsRecovery = false;
3285
3286 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3287 lambdaBodyResult(that, lambdaType, resultInfo);
3288
3289 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3290 attribTree(that.getBody(), localEnv, bodyResultInfo);
3291 } else {
3292 JCBlock body = (JCBlock)that.body;
3293 if (body == breakTree &&
3294 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3295 breakTreeFound(copyEnv(localEnv));
3296 }
3297 attribStats(body.stats, localEnv);
3298 }
3299
3300 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3301
3302 boolean isSpeculativeRound =
3303 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3304
3305 preFlow(that);
3306 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3307
3308 that.type = currentTarget; //avoids recovery at this stage
3309 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3310
3311 if (!isSpeculativeRound) {
3312 //add thrown types as bounds to the thrown types free variables if needed:
3313 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3314 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3315 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3316 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3317 }
3318 }
3319
3320 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3321 }
3322 result = wrongContext ? that.type = types.createErrorType(pt())
3323 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3324 } catch (Types.FunctionDescriptorLookupError ex) {
3325 JCDiagnostic cause = ex.getDiagnostic();
3326 resultInfo.checkContext.report(that, cause);
3327 result = that.type = types.createErrorType(pt());
3328 return;
3329 } catch (CompletionFailure cf) {
3330 chk.completionError(that.pos(), cf);
3331 } catch (Throwable t) {
3332 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3333 //as that would likely cause the same exception again.
3334 needsRecovery = false;
3335 throw t;
3336 } finally {
3337 localEnv.info.scope.leave();
3338 if (needsRecovery) {
3339 Type prevResult = result;
3340 try {
3341 attribTree(that, env, recoveryInfo);
3342 } finally {
3343 if (result == Type.recoveryType) {
3344 result = prevResult;
3345 }
3346 }
3347 }
3348 }
3349 }
3350 //where
3351 class TargetInfo {
3352 Type target;
3353 Type descriptor;
3354
3355 public TargetInfo(Type target, Type descriptor) {
3356 this.target = target;
3357 this.descriptor = descriptor;
3358 }
3359 }
3360
3361 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3362 Type lambdaType;
3363 Type currentTarget = resultInfo.pt;
3364 if (resultInfo.pt != Type.recoveryType) {
3365 /* We need to adjust the target. If the target is an
3366 * intersection type, for example: SAM & I1 & I2 ...
3367 * the target will be updated to SAM
3368 */
3369 currentTarget = targetChecker.visit(currentTarget, that);
3370 if (!currentTarget.isIntersection()) {
3371 if (explicitParamTypes != null) {
3372 currentTarget = infer.instantiateFunctionalInterface(that,
3373 currentTarget, explicitParamTypes, resultInfo.checkContext);
3374 }
3375 currentTarget = types.removeWildcards(currentTarget);
3376 lambdaType = types.findDescriptorType(currentTarget);
3377 } else {
3378 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3379 ListBuffer<Type> components = new ListBuffer<>();
3380 for (Type bound : ict.getExplicitComponents()) {
3381 if (explicitParamTypes != null) {
3382 try {
3383 bound = infer.instantiateFunctionalInterface(that,
3384 bound, explicitParamTypes, resultInfo.checkContext);
3385 } catch (FunctionDescriptorLookupError t) {
3386 // do nothing
3387 }
3388 }
3389 bound = types.removeWildcards(bound);
3390 components.add(bound);
3391 }
3392 currentTarget = types.makeIntersectionType(components.toList());
3393 currentTarget.tsym.flags_field |= INTERFACE;
3394 lambdaType = types.findDescriptorType(currentTarget);
3395 }
3396
3397 } else {
3398 currentTarget = Type.recoveryType;
3399 lambdaType = fallbackDescriptorType(that);
3400 }
3401 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3402 //lambda expression target desc cannot be a generic method
3403 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3404 kindName(currentTarget.tsym),
3405 currentTarget.tsym);
3406 resultInfo.checkContext.report(that, diags.fragment(msg));
3407 currentTarget = types.createErrorType(pt());
3408 }
3409 return new TargetInfo(currentTarget, lambdaType);
3410 }
3411
3412 void preFlow(JCLambda tree) {
3413 attrRecover.doRecovery();
3414 new PostAttrAnalyzer() {
3415 @Override
3416 public void scan(JCTree tree) {
3417 if (tree == null ||
3418 (tree.type != null &&
3419 tree.type == Type.stuckType)) {
3420 //don't touch stuck expressions!
3421 return;
3422 }
3423 super.scan(tree);
3424 }
3425
3426 @Override
3427 public void visitClassDef(JCClassDecl that) {
3428 // or class declaration trees!
3429 }
3430
3431 public void visitLambda(JCLambda that) {
3432 // or lambda expressions!
3433 }
3434 }.scan(tree.body);
3435 }
3436
3437 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3438
3439 @Override
3440 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3441 return t.isIntersection() ?
3442 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3443 }
3444
3445 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3446 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3447 return ict;
3448 }
3449
3450 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3451 ListBuffer<Type> targs = new ListBuffer<>();
3452 ListBuffer<Type> supertypes = new ListBuffer<>();
3453 for (Type i : ict.interfaces_field) {
3454 if (i.isParameterized()) {
3455 targs.appendList(i.tsym.type.allparams());
3456 }
3457 supertypes.append(i.tsym.type);
3458 }
3459 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3460 notionalIntf.allparams_field = targs.toList();
3461 notionalIntf.tsym.flags_field |= INTERFACE;
3462 return notionalIntf.tsym;
3463 }
3464 };
3465
3466 private Type fallbackDescriptorType(JCExpression tree) {
3467 switch (tree.getTag()) {
3468 case LAMBDA:
3469 JCLambda lambda = (JCLambda)tree;
3470 List<Type> argtypes = List.nil();
3471 for (JCVariableDecl param : lambda.params) {
3472 argtypes = param.vartype != null && param.vartype.type != null ?
3473 argtypes.append(param.vartype.type) :
3474 argtypes.append(syms.errType);
3475 }
3476 return new MethodType(argtypes, Type.recoveryType,
3477 List.of(syms.throwableType), syms.methodClass);
3478 case REFERENCE:
3479 return new MethodType(List.nil(), Type.recoveryType,
3480 List.of(syms.throwableType), syms.methodClass);
3481 default:
3482 Assert.error("Cannot get here!");
3483 }
3484 return null;
3485 }
3486
3487 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3488 final InferenceContext inferenceContext, final Type... ts) {
3489 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3490 }
3491
3492 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3493 final InferenceContext inferenceContext, final List<Type> ts) {
3494 if (inferenceContext.free(ts)) {
3495 inferenceContext.addFreeTypeListener(ts,
3496 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3497 } else {
3498 for (Type t : ts) {
3499 rs.checkAccessibleType(env, t);
3500 }
3501 }
3502 }
3503
3504 /**
3505 * Lambda/method reference have a special check context that ensures
3506 * that i.e. a lambda return type is compatible with the expected
3507 * type according to both the inherited context and the assignment
3508 * context.
3509 */
3510 class FunctionalReturnContext extends Check.NestedCheckContext {
3511
3512 FunctionalReturnContext(CheckContext enclosingContext) {
3513 super(enclosingContext);
3514 }
3515
3516 @Override
3517 public boolean compatible(Type found, Type req, Warner warn) {
3518 //return type must be compatible in both current context and assignment context
3519 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3520 }
3521
3522 @Override
3523 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3524 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3525 }
3526 }
3527
3528 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3529
3530 JCExpression expr;
3531 boolean expStmtExpected;
3532
3533 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3534 super(enclosingContext);
3535 this.expr = expr;
3536 }
3537
3538 @Override
3539 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3540 if (expStmtExpected) {
3541 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3542 } else {
3543 super.report(pos, details);
3544 }
3545 }
3546
3547 @Override
3548 public boolean compatible(Type found, Type req, Warner warn) {
3549 //a void return is compatible with an expression statement lambda
3550 if (req.hasTag(VOID)) {
3551 expStmtExpected = true;
3552 return TreeInfo.isExpressionStatement(expr);
3553 } else {
3554 return super.compatible(found, req, warn);
3555 }
3556 }
3557 }
3558
3559 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3560 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3561 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3562 new FunctionalReturnContext(resultInfo.checkContext);
3563
3564 return descriptor.getReturnType() == Type.recoveryType ?
3565 recoveryInfo :
3566 new ResultInfo(KindSelector.VAL,
3567 descriptor.getReturnType(), funcContext);
3568 }
3569
3570 /**
3571 * Lambda compatibility. Check that given return types, thrown types, parameter types
3572 * are compatible with the expected functional interface descriptor. This means that:
3573 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3574 * types must be compatible with the return type of the expected descriptor.
3575 */
3576 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3577 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3578
3579 //return values have already been checked - but if lambda has no return
3580 //values, we must ensure that void/value compatibility is correct;
3581 //this amounts at checking that, if a lambda body can complete normally,
3582 //the descriptor's return type must be void
3583 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3584 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3585 Fragment msg =
3586 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3587 checkContext.report(tree,
3588 diags.fragment(msg));
3589 }
3590
3591 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3592 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3593 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3594 }
3595 }
3596
3597 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3598 * static field and that lambda has type annotations, these annotations will
3599 * also be stored at these fake clinit methods.
3600 *
3601 * LambdaToMethod also use fake clinit methods so they can be reused.
3602 * Also as LTM is a phase subsequent to attribution, the methods from
3603 * clinits can be safely removed by LTM to save memory.
3604 */
3605 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3606
3607 public MethodSymbol removeClinit(ClassSymbol sym) {
3608 return clinits.remove(sym);
3609 }
3610
3611 /* This method returns an environment to be used to attribute a lambda
3612 * expression.
3613 *
3614 * The owner of this environment is a method symbol. If the current owner
3615 * is not a method, for example if the lambda is used to initialize
3616 * a field, then if the field is:
3617 *
3618 * - an instance field, we use the first constructor.
3619 * - a static field, we create a fake clinit method.
3620 */
3621 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3622 Env<AttrContext> lambdaEnv;
3623 Symbol owner = env.info.scope.owner;
3624 if (owner.kind == VAR && owner.owner.kind == TYP) {
3625 //field initializer
3626 ClassSymbol enclClass = owner.enclClass();
3627 Symbol newScopeOwner = env.info.scope.owner;
3628 /* if the field isn't static, then we can get the first constructor
3629 * and use it as the owner of the environment. This is what
3630 * LTM code is doing to look for type annotations so we are fine.
3631 */
3632 if ((owner.flags() & STATIC) == 0) {
3633 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3634 newScopeOwner = s;
3635 break;
3636 }
3637 } else {
3638 /* if the field is static then we need to create a fake clinit
3639 * method, this method can later be reused by LTM.
3640 */
3641 MethodSymbol clinit = clinits.get(enclClass);
3642 if (clinit == null) {
3643 Type clinitType = new MethodType(List.nil(),
3644 syms.voidType, List.nil(), syms.methodClass);
3645 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3646 names.clinit, clinitType, enclClass);
3647 clinit.params = List.nil();
3648 clinits.put(enclClass, clinit);
3649 }
3650 newScopeOwner = clinit;
3651 }
3652 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3653 } else {
3654 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3655 }
3656 lambdaEnv.info.yieldResult = null;
3657 lambdaEnv.info.isLambda = true;
3658 return lambdaEnv;
3659 }
3660
3661 @Override
3662 public void visitReference(final JCMemberReference that) {
3663 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3664 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3665 //method reference only allowed in assignment or method invocation/cast context
3666 log.error(that.pos(), Errors.UnexpectedMref);
3667 }
3668 result = that.type = types.createErrorType(pt());
3669 return;
3670 }
3671 final Env<AttrContext> localEnv = env.dup(that);
3672 try {
3673 //attribute member reference qualifier - if this is a constructor
3674 //reference, the expected kind must be a type
3675 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3676
3677 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3678 exprType = chk.checkConstructorRefType(that.expr, exprType);
3679 if (!exprType.isErroneous() &&
3680 exprType.isRaw() &&
3681 that.typeargs != null) {
3682 log.error(that.expr.pos(),
3683 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3684 Fragments.MrefInferAndExplicitParams));
3685 exprType = types.createErrorType(exprType);
3686 }
3687 }
3688
3689 if (exprType.isErroneous()) {
3690 //if the qualifier expression contains problems,
3691 //give up attribution of method reference
3692 result = that.type = exprType;
3693 return;
3694 }
3695
3696 if (TreeInfo.isStaticSelector(that.expr, names)) {
3697 //if the qualifier is a type, validate it; raw warning check is
3698 //omitted as we don't know at this stage as to whether this is a
3699 //raw selector (because of inference)
3700 chk.validate(that.expr, env, false);
3701 } else {
3702 Symbol lhsSym = TreeInfo.symbol(that.expr);
3703 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3704 }
3705 //attrib type-arguments
3706 List<Type> typeargtypes = List.nil();
3707 if (that.typeargs != null) {
3708 typeargtypes = attribTypes(that.typeargs, localEnv);
3709 }
3710
3711 boolean isTargetSerializable =
3712 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3713 isSerializable(pt());
3714 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3715 Type currentTarget = targetInfo.target;
3716 Type desc = targetInfo.descriptor;
3717
3718 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3719 List<Type> argtypes = desc.getParameterTypes();
3720 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3721
3722 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3723 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3724 }
3725
3726 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3727 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3728 try {
3729 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3730 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3731 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3732 } finally {
3733 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3734 }
3735
3736 Symbol refSym = refResult.fst;
3737 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3738
3739 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3740 * JDK-8075541
3741 */
3742 if (refSym.kind != MTH) {
3743 boolean targetError;
3744 switch (refSym.kind) {
3745 case ABSENT_MTH:
3746 case MISSING_ENCL:
3747 targetError = false;
3748 break;
3749 case WRONG_MTH:
3750 case WRONG_MTHS:
3751 case AMBIGUOUS:
3752 case HIDDEN:
3753 case STATICERR:
3754 targetError = true;
3755 break;
3756 default:
3757 Assert.error("unexpected result kind " + refSym.kind);
3758 targetError = false;
3759 }
3760
3761 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3762 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3763 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3764
3765 JCDiagnostic diag = diags.create(log.currentSource(), that,
3766 targetError ?
3767 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3768 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3769
3770 if (targetError && currentTarget == Type.recoveryType) {
3771 //a target error doesn't make sense during recovery stage
3772 //as we don't know what actual parameter types are
3773 result = that.type = currentTarget;
3774 return;
3775 } else {
3776 if (targetError) {
3777 resultInfo.checkContext.report(that, diag);
3778 } else {
3779 log.report(diag);
3780 }
3781 result = that.type = types.createErrorType(currentTarget);
3782 return;
3783 }
3784 }
3785
3786 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3787 that.kind = lookupHelper.referenceKind(that.sym);
3788 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3789
3790 if (desc.getReturnType() == Type.recoveryType) {
3791 // stop here
3792 result = that.type = currentTarget;
3793 return;
3794 }
3795
3796 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3797 Type enclosingType = exprType.getEnclosingType();
3798 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3799 // Check for the existence of an appropriate outer instance
3800 rs.resolveImplicitThis(that.pos(), env, exprType);
3801 }
3802 }
3803
3804 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3805
3806 if (that.getMode() == ReferenceMode.INVOKE &&
3807 TreeInfo.isStaticSelector(that.expr, names) &&
3808 that.kind.isUnbound() &&
3809 lookupHelper.site.isRaw()) {
3810 chk.checkRaw(that.expr, localEnv);
3811 }
3812
3813 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3814 exprType.getTypeArguments().nonEmpty()) {
3815 //static ref with class type-args
3816 log.error(that.expr.pos(),
3817 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3818 Fragments.StaticMrefWithTargs));
3819 result = that.type = types.createErrorType(currentTarget);
3820 return;
3821 }
3822
3823 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3824 // Check that super-qualified symbols are not abstract (JLS)
3825 rs.checkNonAbstract(that.pos(), that.sym);
3826 }
3827
3828 if (isTargetSerializable) {
3829 chk.checkAccessFromSerializableElement(that, true);
3830 }
3831 }
3832
3833 ResultInfo checkInfo =
3834 resultInfo.dup(newMethodTemplate(
3835 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3836 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3837 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3838
3839 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3840
3841 if (that.kind.isUnbound() &&
3842 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3843 //re-generate inference constraints for unbound receiver
3844 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3845 //cannot happen as this has already been checked - we just need
3846 //to regenerate the inference constraints, as that has been lost
3847 //as a result of the call to inferenceContext.save()
3848 Assert.error("Can't get here");
3849 }
3850 }
3851
3852 if (!refType.isErroneous()) {
3853 refType = types.createMethodTypeWithReturn(refType,
3854 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3855 }
3856
3857 //go ahead with standard method reference compatibility check - note that param check
3858 //is a no-op (as this has been taken care during method applicability)
3859 boolean isSpeculativeRound =
3860 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3861
3862 that.type = currentTarget; //avoids recovery at this stage
3863 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3864 if (!isSpeculativeRound) {
3865 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3866 }
3867 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3868 } catch (Types.FunctionDescriptorLookupError ex) {
3869 JCDiagnostic cause = ex.getDiagnostic();
3870 resultInfo.checkContext.report(that, cause);
3871 result = that.type = types.createErrorType(pt());
3872 return;
3873 }
3874 }
3875 //where
3876 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3877 //if this is a constructor reference, the expected kind must be a type
3878 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3879 KindSelector.VAL_TYP : KindSelector.TYP,
3880 Type.noType);
3881 }
3882
3883
3884 @SuppressWarnings("fallthrough")
3885 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3886 InferenceContext inferenceContext = checkContext.inferenceContext();
3887 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3888
3889 Type resType;
3890 switch (tree.getMode()) {
3891 case NEW:
3892 if (!tree.expr.type.isRaw()) {
3893 resType = tree.expr.type;
3894 break;
3895 }
3896 default:
3897 resType = refType.getReturnType();
3898 }
3899
3900 Type incompatibleReturnType = resType;
3901
3902 if (returnType.hasTag(VOID)) {
3903 incompatibleReturnType = null;
3904 }
3905
3906 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3907 if (resType.isErroneous() ||
3908 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3909 checkContext.checkWarner(tree, resType, returnType))) {
3910 incompatibleReturnType = null;
3911 }
3912 }
3913
3914 if (incompatibleReturnType != null) {
3915 Fragment msg =
3916 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3917 checkContext.report(tree, diags.fragment(msg));
3918 } else {
3919 if (inferenceContext.free(refType)) {
3920 // we need to wait for inference to finish and then replace inference vars in the referent type
3921 inferenceContext.addFreeTypeListener(List.of(refType),
3922 instantiatedContext -> {
3923 tree.referentType = instantiatedContext.asInstType(refType);
3924 });
3925 } else {
3926 tree.referentType = refType;
3927 }
3928 }
3929
3930 if (!speculativeAttr) {
3931 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3932 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3933 }
3934 }
3935 }
3936
3937 boolean checkExConstraints(
3938 List<Type> thrownByFuncExpr,
3939 List<Type> thrownAtFuncType,
3940 InferenceContext inferenceContext) {
3941 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3942 * are not proper types
3943 */
3944 List<Type> nonProperList = thrownAtFuncType.stream()
3945 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3946 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3947
3948 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3949 * in the throws clause of the invocation type of the method reference's compile-time
3950 * declaration
3951 */
3952 List<Type> checkedList = thrownByFuncExpr.stream()
3953 .filter(e -> chk.isChecked(e)).collect(List.collector());
3954
3955 /** If n = 0 (the function type's throws clause consists only of proper types), then
3956 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3957 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3958 * reduces to true
3959 */
3960 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3961 for (Type checked : checkedList) {
3962 boolean isSubtype = false;
3963 for (Type proper : properList) {
3964 if (types.isSubtype(checked, proper)) {
3965 isSubtype = true;
3966 break;
3967 }
3968 }
3969 if (!isSubtype) {
3970 uncaughtByProperTypes.add(checked);
3971 }
3972 }
3973
3974 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3975 return false;
3976 }
3977
3978 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3979 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3980 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3981 */
3982 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3983 uncaughtByProperTypes.forEach(checkedEx -> {
3984 nonProperAsUndet.forEach(nonProper -> {
3985 types.isSubtype(checkedEx, nonProper);
3986 });
3987 });
3988
3989 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3990 */
3991 nonProperAsUndet.stream()
3992 .filter(t -> t.hasTag(UNDETVAR))
3993 .forEach(t -> ((UndetVar)t).setThrow());
3994 return true;
3995 }
3996
3997 /**
3998 * Set functional type info on the underlying AST. Note: as the target descriptor
3999 * might contain inference variables, we might need to register an hook in the
4000 * current inference context.
4001 */
4002 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4003 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4004 if (checkContext.inferenceContext().free(descriptorType)) {
4005 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4006 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4007 inferenceContext.asInstType(primaryTarget), checkContext));
4008 } else {
4009 if (pt.hasTag(CLASS)) {
4010 fExpr.target = primaryTarget;
4011 }
4012 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4013 pt != Type.recoveryType) {
4014 //check that functional interface class is well-formed
4015 try {
4016 /* Types.makeFunctionalInterfaceClass() may throw an exception
4017 * when it's executed post-inference. See the listener code
4018 * above.
4019 */
4020 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4021 names.empty, fExpr.target, ABSTRACT);
4022 if (csym != null) {
4023 chk.checkImplementations(env.tree, csym, csym);
4024 try {
4025 //perform an additional functional interface check on the synthetic class,
4026 //as there may be spurious errors for raw targets - because of existing issues
4027 //with membership and inheritance (see JDK-8074570).
4028 csym.flags_field |= INTERFACE;
4029 types.findDescriptorType(csym.type);
4030 } catch (FunctionDescriptorLookupError err) {
4031 resultInfo.checkContext.report(fExpr,
4032 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4033 }
4034 }
4035 } catch (Types.FunctionDescriptorLookupError ex) {
4036 JCDiagnostic cause = ex.getDiagnostic();
4037 resultInfo.checkContext.report(env.tree, cause);
4038 }
4039 }
4040 }
4041 }
4042
4043 public void visitParens(JCParens tree) {
4044 Type owntype = attribTree(tree.expr, env, resultInfo);
4045 result = check(tree, owntype, pkind(), resultInfo);
4046 Symbol sym = TreeInfo.symbol(tree);
4047 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4048 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4049 }
4050
4051 public void visitAssign(JCAssign tree) {
4052 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4053 Type capturedType = capture(owntype);
4054 attribExpr(tree.rhs, env, owntype);
4055 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4056 }
4057
4058 public void visitAssignop(JCAssignOp tree) {
4059 // Attribute arguments.
4060 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4061 Type operand = attribExpr(tree.rhs, env);
4062 // Find operator.
4063 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4064 if (operator != operators.noOpSymbol &&
4065 !owntype.isErroneous() &&
4066 !operand.isErroneous()) {
4067 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4068 chk.checkCastable(tree.rhs.pos(),
4069 operator.type.getReturnType(),
4070 owntype);
4071 }
4072 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4073 }
4074
4075 public void visitUnary(JCUnary tree) {
4076 // Attribute arguments.
4077 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4078 ? attribTree(tree.arg, env, varAssignmentInfo)
4079 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4080
4081 // Find operator.
4082 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4083 Type owntype = types.createErrorType(tree.type);
4084 if (operator != operators.noOpSymbol &&
4085 !argtype.isErroneous()) {
4086 owntype = (tree.getTag().isIncOrDecUnaryOp())
4087 ? tree.arg.type
4088 : operator.type.getReturnType();
4089 int opc = ((OperatorSymbol)operator).opcode;
4090
4091 // If the argument is constant, fold it.
4092 if (argtype.constValue() != null) {
4093 Type ctype = cfolder.fold1(opc, argtype);
4094 if (ctype != null) {
4095 owntype = cfolder.coerce(ctype, owntype);
4096 }
4097 }
4098 }
4099 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4100 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4101 }
4102
4103 public void visitBinary(JCBinary tree) {
4104 // Attribute arguments.
4105 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4106 // x && y
4107 // include x's bindings when true in y
4108
4109 // x || y
4110 // include x's bindings when false in y
4111
4112 MatchBindings lhsBindings = matchBindings;
4113 List<BindingSymbol> propagatedBindings;
4114 switch (tree.getTag()) {
4115 case AND:
4116 propagatedBindings = lhsBindings.bindingsWhenTrue;
4117 break;
4118 case OR:
4119 propagatedBindings = lhsBindings.bindingsWhenFalse;
4120 break;
4121 default:
4122 propagatedBindings = List.nil();
4123 break;
4124 }
4125 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4126 Type right;
4127 try {
4128 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4129 } finally {
4130 rhsEnv.info.scope.leave();
4131 }
4132
4133 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4134
4135 // Find operator.
4136 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4137 Type owntype = types.createErrorType(tree.type);
4138 if (operator != operators.noOpSymbol &&
4139 !left.isErroneous() &&
4140 !right.isErroneous()) {
4141 owntype = operator.type.getReturnType();
4142 int opc = ((OperatorSymbol)operator).opcode;
4143 // If both arguments are constants, fold them.
4144 if (left.constValue() != null && right.constValue() != null) {
4145 Type ctype = cfolder.fold2(opc, left, right);
4146 if (ctype != null) {
4147 owntype = cfolder.coerce(ctype, owntype);
4148 }
4149 }
4150
4151 // Check that argument types of a reference ==, != are
4152 // castable to each other, (JLS 15.21). Note: unboxing
4153 // comparisons will not have an acmp* opc at this point.
4154 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4155 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4156 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4157 }
4158 chk.checkForSuspectClassLiteralComparison(tree, left, right);
4159 }
4160
4161 chk.checkDivZero(tree.rhs.pos(), operator, right);
4162 }
4163 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4164 }
4165
4166 public void visitTypeCast(final JCTypeCast tree) {
4167 Type clazztype = attribType(tree.clazz, env);
4168 chk.validate(tree.clazz, env, false);
4169 //a fresh environment is required for 292 inference to work properly ---
4170 //see Infer.instantiatePolymorphicSignatureInstance()
4171 Env<AttrContext> localEnv = env.dup(tree);
4172 //should we propagate the target type?
4173 final ResultInfo castInfo;
4174 JCExpression expr = TreeInfo.skipParens(tree.expr);
4175 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4176 if (isPoly) {
4177 //expression is a poly - we need to propagate target type info
4178 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4179 new Check.NestedCheckContext(resultInfo.checkContext) {
4180 @Override
4181 public boolean compatible(Type found, Type req, Warner warn) {
4182 return types.isCastable(found, req, warn);
4183 }
4184 });
4185 } else {
4186 //standalone cast - target-type info is not propagated
4187 castInfo = unknownExprInfo;
4188 }
4189 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4190 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4191 if (exprtype.constValue() != null)
4192 owntype = cfolder.coerce(exprtype, owntype);
4193 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4194 if (!isPoly)
4195 chk.checkRedundantCast(localEnv, tree);
4196 }
4197
4198 public void visitTypeTest(JCInstanceOf tree) {
4199 Type exprtype = chk.checkNullOrRefType(
4200 tree.expr.pos(), attribExpr(tree.expr, env));
4201 Type clazztype;
4202 JCTree typeTree;
4203 if (tree.pattern.getTag() == BINDINGPATTERN ||
4204 tree.pattern.getTag() == PARENTHESIZEDPATTERN) {
4205 attribTree(tree.pattern, env, unknownExprInfo);
4206 clazztype = tree.pattern.type;
4207 if (types.isSubtype(exprtype, clazztype) &&
4208 !exprtype.isErroneous() && !clazztype.isErroneous()) {
4209 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4210 }
4211 typeTree = TreeInfo.primaryPatternTree((JCPattern) tree.pattern).var.vartype;
4212 } else {
4213 clazztype = attribType(tree.pattern, env);
4214 typeTree = tree.pattern;
4215 chk.validate(typeTree, env, false);
4216 }
4217 if (!clazztype.hasTag(TYPEVAR)) {
4218 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4219 }
4220 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4221 boolean valid = false;
4222 if (allowReifiableTypesInInstanceof) {
4223 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4224 } else {
4225 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4226 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4227 allowReifiableTypesInInstanceof = true;
4228 }
4229 if (!valid) {
4230 clazztype = types.createErrorType(clazztype);
4231 }
4232 }
4233 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4234 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4235 }
4236
4237 private boolean checkCastablePattern(DiagnosticPosition pos,
4238 Type exprType,
4239 Type pattType) {
4240 Warner warner = new Warner();
4241 if (!types.isCastable(exprType, pattType, warner)) {
4242 chk.basicHandler.report(pos,
4243 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4244 return false;
4245 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4246 log.error(pos,
4247 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4248 return false;
4249 } else {
4250 return true;
4251 }
4252 }
4253
4254 public void visitBindingPattern(JCBindingPattern tree) {
4255 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
4256 tree.type = tree.var.type = attribTree(tree.var.vartype, env, varInfo);
4257 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, tree.var.vartype.type, env.info.scope.owner);
4258 v.pos = tree.pos;
4259 tree.var.sym = v;
4260 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4261 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4262 }
4263 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4264 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4265 annotate.flush();
4266 chk.validate(tree.var.vartype, env, true);
4267 result = tree.type;
4268 matchBindings = new MatchBindings(List.of(v), List.nil());
4269 }
4270
4271 @Override
4272 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4273 attribExpr(tree.pattern, env);
4274 result = tree.type = tree.pattern.type;
4275 }
4276
4277 @Override
4278 public void visitGuardPattern(JCGuardPattern tree) {
4279 attribExpr(tree.patt, env);
4280 MatchBindings afterPattern = matchBindings;
4281 Env<AttrContext> bodyEnv = bindingEnv(env, matchBindings.bindingsWhenTrue);
4282 try {
4283 attribExpr(tree.expr, bodyEnv, syms.booleanType);
4284 } finally {
4285 bodyEnv.info.scope.leave();
4286 }
4287 result = tree.type = tree.patt.type;
4288 matchBindings = matchBindingsComputer.guardedPattern(tree, afterPattern, matchBindings);
4289 }
4290
4291 public void visitIndexed(JCArrayAccess tree) {
4292 Type owntype = types.createErrorType(tree.type);
4293 Type atype = attribExpr(tree.indexed, env);
4294 attribExpr(tree.index, env, syms.intType);
4295 if (types.isArray(atype))
4296 owntype = types.elemtype(atype);
4297 else if (!atype.hasTag(ERROR))
4298 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4299 if (!pkind().contains(KindSelector.VAL))
4300 owntype = capture(owntype);
4301 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4302 }
4303
4304 public void visitIdent(JCIdent tree) {
4305 Symbol sym;
4306
4307 // Find symbol
4308 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4309 // If we are looking for a method, the prototype `pt' will be a
4310 // method type with the type of the call's arguments as parameters.
4311 env.info.pendingResolutionPhase = null;
4312 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4313 } else if (tree.sym != null && tree.sym.kind != VAR) {
4314 sym = tree.sym;
4315 } else {
4316 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4317 }
4318 tree.sym = sym;
4319
4320 // Also find the environment current for the class where
4321 // sym is defined (`symEnv').
4322 Env<AttrContext> symEnv = env;
4323 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4324 sym.kind.matches(KindSelector.VAL_MTH) &&
4325 sym.owner.kind == TYP &&
4326 tree.name != names._this && tree.name != names._super) {
4327
4328 // Find environment in which identifier is defined.
4329 while (symEnv.outer != null &&
4330 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4331 symEnv = symEnv.outer;
4332 }
4333 }
4334
4335 // If symbol is a variable, ...
4336 if (sym.kind == VAR) {
4337 VarSymbol v = (VarSymbol)sym;
4338
4339 // ..., evaluate its initializer, if it has one, and check for
4340 // illegal forward reference.
4341 checkInit(tree, env, v, false);
4342
4343 // If we are expecting a variable (as opposed to a value), check
4344 // that the variable is assignable in the current environment.
4345 if (KindSelector.ASG.subset(pkind()))
4346 checkAssignable(tree.pos(), v, null, env);
4347 }
4348
4349 // In a constructor body,
4350 // if symbol is a field or instance method, check that it is
4351 // not accessed before the supertype constructor is called.
4352 if (symEnv.info.isSelfCall &&
4353 sym.kind.matches(KindSelector.VAL_MTH) &&
4354 sym.owner.kind == TYP &&
4355 (sym.flags() & STATIC) == 0) {
4356 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4357 sym : thisSym(tree.pos(), env));
4358 }
4359 Env<AttrContext> env1 = env;
4360 if (sym.kind != ERR && sym.kind != TYP &&
4361 sym.owner != null && sym.owner != env1.enclClass.sym) {
4362 // If the found symbol is inaccessible, then it is
4363 // accessed through an enclosing instance. Locate this
4364 // enclosing instance:
4365 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4366 env1 = env1.outer;
4367 }
4368
4369 if (env.info.isSerializable) {
4370 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4371 }
4372
4373 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4374 }
4375
4376 public void visitSelect(JCFieldAccess tree) {
4377 // Determine the expected kind of the qualifier expression.
4378 KindSelector skind = KindSelector.NIL;
4379 if (tree.name == names._this || tree.name == names._super ||
4380 tree.name == names._class)
4381 {
4382 skind = KindSelector.TYP;
4383 } else {
4384 if (pkind().contains(KindSelector.PCK))
4385 skind = KindSelector.of(skind, KindSelector.PCK);
4386 if (pkind().contains(KindSelector.TYP))
4387 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4388 if (pkind().contains(KindSelector.VAL_MTH))
4389 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4390 }
4391
4392 // Attribute the qualifier expression, and determine its symbol (if any).
4393 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4394 Assert.check(site == tree.selected.type);
4395 if (tree.name == names._class && site.isPrimitiveClass()) {
4396 /* JDK-8269956: Where a reflective (class) literal is needed, the unqualified Point.class is
4397 * always the "primary" mirror - representing the primitive reference runtime type - thereby
4398 * always matching the behavior of Object::getClass
4399 */
4400 if (!tree.selected.hasTag(SELECT) || ((JCFieldAccess) tree.selected).name != names.val) {
4401 tree.selected.setType(site = site.referenceProjection());
4402 }
4403 }
4404 if (!pkind().contains(KindSelector.TYP_PCK))
4405 site = capture(site); // Capture field access
4406
4407 // don't allow T.class T[].class, etc
4408 if (skind == KindSelector.TYP) {
4409 Type elt = site;
4410 while (elt.hasTag(ARRAY))
4411 elt = ((ArrayType)elt).elemtype;
4412 if (elt.hasTag(TYPEVAR)) {
4413 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4414 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4415 tree.sym = tree.type.tsym;
4416 return;
4417 }
4418 }
4419
4420 // If qualifier symbol is a type or `super', assert `selectSuper'
4421 // for the selection. This is relevant for determining whether
4422 // protected symbols are accessible.
4423 Symbol sitesym = TreeInfo.symbol(tree.selected);
4424
4425 boolean selectSuperPrev = env.info.selectSuper;
4426 env.info.selectSuper =
4427 sitesym != null &&
4428 sitesym.name == names._super;
4429
4430 // Determine the symbol represented by the selection.
4431 env.info.pendingResolutionPhase = null;
4432 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4433 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4434 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4435 sym = syms.errSymbol;
4436 }
4437 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4438 site = capture(site);
4439 sym = selectSym(tree, sitesym, site, env, resultInfo);
4440 }
4441 boolean varArgs = env.info.lastResolveVarargs();
4442 tree.sym = sym;
4443
4444 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4445 site = types.skipTypeVars(site, true);
4446 }
4447
4448 // If that symbol is a variable, ...
4449 if (sym.kind == VAR) {
4450 VarSymbol v = (VarSymbol)sym;
4451
4452 // ..., evaluate its initializer, if it has one, and check for
4453 // illegal forward reference.
4454 checkInit(tree, env, v, true);
4455
4456 // If we are expecting a variable (as opposed to a value), check
4457 // that the variable is assignable in the current environment.
4458 if (KindSelector.ASG.subset(pkind()))
4459 checkAssignable(tree.pos(), v, tree.selected, env);
4460 }
4461
4462 if (sitesym != null &&
4463 sitesym.kind == VAR &&
4464 ((VarSymbol)sitesym).isResourceVariable() &&
4465 sym.kind == MTH &&
4466 sym.name.equals(names.close) &&
4467 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4468 env.info.lint.isEnabled(LintCategory.TRY)) {
4469 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4470 }
4471
4472 // Disallow selecting a type from an expression
4473 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4474 tree.type = check(tree.selected, pt(),
4475 sitesym == null ?
4476 KindSelector.VAL : sitesym.kind.toSelector(),
4477 new ResultInfo(KindSelector.TYP_PCK, pt()));
4478 }
4479
4480 if (isType(sitesym)) {
4481 if (sym.name == names._this || sym.name == names._super) {
4482 // If `C' is the currently compiled class, check that
4483 // `C.this' does not appear in an explicit call to a constructor
4484 // also make sure that `super` is not used in constructor invocations
4485 if (env.info.isSelfCall &&
4486 ((sym.name == names._this &&
4487 site.tsym == env.enclClass.sym) ||
4488 sym.name == names._super && env.info.constructorArgs)) {
4489 chk.earlyRefError(tree.pos(), sym);
4490 }
4491 } else {
4492 // Check if type-qualified fields or methods are static (JLS)
4493 if ((sym.flags() & STATIC) == 0 &&
4494 sym.name != names._super &&
4495 (sym.kind == VAR || sym.kind == MTH)) {
4496 rs.accessBase(rs.new StaticError(sym),
4497 tree.pos(), site, sym.name, true);
4498 }
4499 }
4500 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
4501 sym.isStatic() && sym.kind == MTH) {
4502 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
4503 }
4504 } else if (sym.kind != ERR &&
4505 (sym.flags() & STATIC) != 0 &&
4506 sym.name != names._class) {
4507 // If the qualified item is not a type and the selected item is static, report
4508 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4509 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4510 }
4511
4512 // If we are selecting an instance member via a `super', ...
4513 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4514
4515 // Check that super-qualified symbols are not abstract (JLS)
4516 rs.checkNonAbstract(tree.pos(), sym);
4517
4518 if (site.isRaw()) {
4519 // Determine argument types for site.
4520 Type site1 = types.asSuper(env.enclClass.sym.type.referenceProjectionOrSelf(), site.tsym);
4521 if (site1 != null) site = site1;
4522 }
4523 }
4524
4525 if (env.info.isSerializable) {
4526 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4527 }
4528
4529 env.info.selectSuper = selectSuperPrev;
4530 result = checkId(tree, site, sym, env, resultInfo);
4531 }
4532 //where
4533 /** Determine symbol referenced by a Select expression,
4534 *
4535 * @param tree The select tree.
4536 * @param site The type of the selected expression,
4537 * @param env The current environment.
4538 * @param resultInfo The current result.
4539 */
4540 private Symbol selectSym(JCFieldAccess tree,
4541 Symbol location,
4542 Type site,
4543 Env<AttrContext> env,
4544 ResultInfo resultInfo) {
4545 DiagnosticPosition pos = tree.pos();
4546 Name name = tree.name;
4547 switch (site.getTag()) {
4548 case PACKAGE:
4549 return rs.accessBase(
4550 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4551 pos, location, site, name, true);
4552 case ARRAY:
4553 case CLASS:
4554 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4555 return rs.resolveQualifiedMethod(
4556 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4557 } else if (name == names._this || name == names._super) {
4558 return rs.resolveSelf(pos, env, site.tsym, name);
4559 } else if (name == names._class) {
4560 // In this case, we have already made sure in
4561 // visitSelect that qualifier expression is a type.
4562 return syms.getClassField(site, types);
4563 } else if ((name == names.ref || name == names.val) && site.tsym != null && site.tsym.isPrimitiveClass() && isType(location) && resultInfo.pkind.contains(KindSelector.TYP)) {
4564 return site.tsym; // TODO: JDK-8244229: Need more robust handling of .ref and .val reference in source code
4565 } else {
4566 // We are seeing a plain identifier as selector.
4567 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4568 sym = rs.accessBase(sym, pos, location, site, name, true);
4569 return sym;
4570 }
4571 case WILDCARD:
4572 throw new AssertionError(tree);
4573 case TYPEVAR:
4574 // Normally, site.getUpperBound() shouldn't be null.
4575 // It should only happen during memberEnter/attribBase
4576 // when determining the super type which *must* be
4577 // done before attributing the type variables. In
4578 // other words, we are seeing this illegal program:
4579 // class B<T> extends A<T.foo> {}
4580 Symbol sym = (site.getUpperBound() != null)
4581 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4582 : null;
4583 if (sym == null) {
4584 log.error(pos, Errors.TypeVarCantBeDeref);
4585 return syms.errSymbol;
4586 } else {
4587 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4588 rs.new AccessError(env, site, sym) :
4589 sym;
4590 rs.accessBase(sym2, pos, location, site, name, true);
4591 return sym;
4592 }
4593 case ERROR:
4594 // preserve identifier names through errors
4595 return types.createErrorType(name, site.tsym, site).tsym;
4596 default:
4597 // The qualifier expression is of a primitive type -- only
4598 // .class is allowed for these.
4599 if (name == names._class) {
4600 // In this case, we have already made sure in Select that
4601 // qualifier expression is a type.
4602 return syms.getClassField(site, types);
4603 } else {
4604 log.error(pos, Errors.CantDeref(site));
4605 return syms.errSymbol;
4606 }
4607 }
4608 }
4609
4610 /** Determine type of identifier or select expression and check that
4611 * (1) the referenced symbol is not deprecated
4612 * (2) the symbol's type is safe (@see checkSafe)
4613 * (3) if symbol is a variable, check that its type and kind are
4614 * compatible with the prototype and protokind.
4615 * (4) if symbol is an instance field of a raw type,
4616 * which is being assigned to, issue an unchecked warning if its
4617 * type changes under erasure.
4618 * (5) if symbol is an instance method of a raw type, issue an
4619 * unchecked warning if its argument types change under erasure.
4620 * If checks succeed:
4621 * If symbol is a constant, return its constant type
4622 * else if symbol is a method, return its result type
4623 * otherwise return its type.
4624 * Otherwise return errType.
4625 *
4626 * @param tree The syntax tree representing the identifier
4627 * @param site If this is a select, the type of the selected
4628 * expression, otherwise the type of the current class.
4629 * @param sym The symbol representing the identifier.
4630 * @param env The current environment.
4631 * @param resultInfo The expected result
4632 */
4633 Type checkId(JCTree tree,
4634 Type site,
4635 Symbol sym,
4636 Env<AttrContext> env,
4637 ResultInfo resultInfo) {
4638 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4639 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4640 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4641 }
4642
4643 Type checkMethodIdInternal(JCTree tree,
4644 Type site,
4645 Symbol sym,
4646 Env<AttrContext> env,
4647 ResultInfo resultInfo) {
4648 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4649 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4650 } else {
4651 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4652 }
4653 }
4654
4655 Type checkIdInternal(JCTree tree,
4656 Type site,
4657 Symbol sym,
4658 Type pt,
4659 Env<AttrContext> env,
4660 ResultInfo resultInfo) {
4661 if (pt.isErroneous()) {
4662 return types.createErrorType(site);
4663 }
4664 Type owntype; // The computed type of this identifier occurrence.
4665 switch (sym.kind) {
4666 case TYP:
4667 // For types, the computed type equals the symbol's type,
4668 // except for three situations:
4669 owntype = sym.type;
4670 if (owntype.hasTag(CLASS)) {
4671 Assert.check(owntype.getFlavor() != Flavor.X_Typeof_X);
4672 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4673 Type ownOuter = owntype.getEnclosingType();
4674
4675 // (a) If symbol is a primitive class and its reference/value projection
4676 // is requested via the .ref/.val notation, then adjust the computed type to
4677 // reflect this.
4678 if (sym.isPrimitiveClass()) {
4679 if (sym.isReferenceFavoringPrimitiveClass()) {
4680 Assert.check(owntype.getFlavor() == Flavor.L_TypeOf_Q);
4681 } else {
4682 Assert.check(owntype.getFlavor() == Flavor.Q_TypeOf_Q);
4683 }
4684 if (tree.hasTag(SELECT)) {
4685 Name name = ((JCFieldAccess)tree).name;
4686 if (name == names.ref) {
4687 if (sym.isReferenceFavoringPrimitiveClass()) {
4688 // We should already be good to go with owntype
4689 } else {
4690 owntype = new ClassType(ownOuter, owntype.getTypeArguments(), (TypeSymbol)sym, owntype.getMetadata(), Flavor.L_TypeOf_Q);
4691 }
4692 } else if (name == names.val) {
4693 if (sym.isReferenceFavoringPrimitiveClass()) {
4694 owntype = new ClassType(ownOuter, owntype.getTypeArguments(), (TypeSymbol)sym, owntype.getMetadata(), Flavor.Q_TypeOf_L);
4695 } else {
4696 // We should already be good to go with owntype
4697 }
4698 }
4699 }
4700 }
4701
4702 // (b) If the symbol's type is parameterized, erase it
4703 // because no type parameters were given.
4704 // We recover generic outer type later in visitTypeApply.
4705 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4706 owntype = types.erasure(owntype);
4707 }
4708
4709 // (c) If the symbol's type is an inner class, then
4710 // we have to interpret its outer type as a superclass
4711 // of the site type. Example:
4712 //
4713 // class Tree<A> { class Visitor { ... } }
4714 // class PointTree extends Tree<Point> { ... }
4715 // ...PointTree.Visitor...
4716 //
4717 // Then the type of the last expression above is
4718 // Tree<Point>.Visitor.
4719 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4720 Type normOuter = site;
4721 if (normOuter.hasTag(CLASS)) {
4722 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4723 }
4724 if (normOuter == null) // perhaps from an import
4725 normOuter = types.erasure(ownOuter);
4726 if (normOuter != ownOuter)
4727 owntype = new ClassType(
4728 normOuter, List.nil(), owntype.tsym,
4729 owntype.getMetadata(), owntype.getFlavor());
4730 }
4731 }
4732 break;
4733 case VAR:
4734 VarSymbol v = (VarSymbol)sym;
4735
4736 if (env.info.enclVar != null
4737 && v.type.hasTag(NONE)) {
4738 //self reference to implicitly typed variable declaration
4739 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4740 return v.type = types.createErrorType(v.type);
4741 }
4742
4743 // Test (4): if symbol is an instance field of a raw type,
4744 // which is being assigned to, issue an unchecked warning if
4745 // its type changes under erasure.
4746 if (KindSelector.ASG.subset(pkind()) &&
4747 v.owner.kind == TYP &&
4748 (v.flags() & STATIC) == 0 &&
4749 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4750 Type s = types.asOuterSuper(site, v.owner);
4751 if (s != null &&
4752 s.isRaw() &&
4753 !types.isSameType(v.type, v.erasure(types))) {
4754 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4755 }
4756 }
4757 // The computed type of a variable is the type of the
4758 // variable symbol, taken as a member of the site type.
4759 owntype = (sym.owner.kind == TYP &&
4760 sym.name != names._this && sym.name != names._super)
4761 ? types.memberType(site, sym)
4762 : sym.type;
4763
4764 // If the variable is a constant, record constant value in
4765 // computed type.
4766 if (v.getConstValue() != null && isStaticReference(tree))
4767 owntype = owntype.constType(v.getConstValue());
4768
4769 if (resultInfo.pkind == KindSelector.VAL) {
4770 owntype = capture(owntype); // capture "names as expressions"
4771 }
4772 break;
4773 case MTH: {
4774 owntype = checkMethod(site, sym,
4775 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4776 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4777 resultInfo.pt.getTypeArguments());
4778 break;
4779 }
4780 case PCK: case ERR:
4781 owntype = sym.type;
4782 break;
4783 default:
4784 throw new AssertionError("unexpected kind: " + sym.kind +
4785 " in tree " + tree);
4786 }
4787
4788 // Emit a `deprecation' warning if symbol is deprecated.
4789 // (for constructors (but not for constructor references), the error
4790 // was given when the constructor was resolved)
4791
4792 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4793 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4794 chk.checkSunAPI(tree.pos(), sym);
4795 chk.checkProfile(tree.pos(), sym);
4796 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4797 }
4798
4799 // If symbol is a variable, check that its type and
4800 // kind are compatible with the prototype and protokind.
4801 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4802 }
4803
4804 /** Check that variable is initialized and evaluate the variable's
4805 * initializer, if not yet done. Also check that variable is not
4806 * referenced before it is defined.
4807 * @param tree The tree making up the variable reference.
4808 * @param env The current environment.
4809 * @param v The variable's symbol.
4810 */
4811 private void checkInit(JCTree tree,
4812 Env<AttrContext> env,
4813 VarSymbol v,
4814 boolean onlyWarning) {
4815 // A forward reference is diagnosed if the declaration position
4816 // of the variable is greater than the current tree position
4817 // and the tree and variable definition occur in the same class
4818 // definition. Note that writes don't count as references.
4819 // This check applies only to class and instance
4820 // variables. Local variables follow different scope rules,
4821 // and are subject to definite assignment checking.
4822 Env<AttrContext> initEnv = enclosingInitEnv(env);
4823 if (initEnv != null &&
4824 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4825 v.owner.kind == TYP &&
4826 v.owner == env.info.scope.owner.enclClass() &&
4827 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4828 (!env.tree.hasTag(ASSIGN) ||
4829 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4830 if (!onlyWarning || isStaticEnumField(v)) {
4831 Error errkey = (initEnv.info.enclVar == v) ?
4832 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4833 log.error(tree.pos(), errkey);
4834 } else if (useBeforeDeclarationWarning) {
4835 Warning warnkey = (initEnv.info.enclVar == v) ?
4836 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4837 log.warning(tree.pos(), warnkey);
4838 }
4839 }
4840
4841 v.getConstValue(); // ensure initializer is evaluated
4842
4843 checkEnumInitializer(tree, env, v);
4844 }
4845
4846 /**
4847 * Returns the enclosing init environment associated with this env (if any). An init env
4848 * can be either a field declaration env or a static/instance initializer env.
4849 */
4850 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4851 while (true) {
4852 switch (env.tree.getTag()) {
4853 case VARDEF:
4854 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4855 if (vdecl.sym.owner.kind == TYP) {
4856 //field
4857 return env;
4858 }
4859 break;
4860 case BLOCK:
4861 if (env.next.tree.hasTag(CLASSDEF)) {
4862 //instance/static initializer
4863 return env;
4864 }
4865 break;
4866 case METHODDEF:
4867 case CLASSDEF:
4868 case TOPLEVEL:
4869 return null;
4870 }
4871 Assert.checkNonNull(env.next);
4872 env = env.next;
4873 }
4874 }
4875
4876 /**
4877 * Check for illegal references to static members of enum. In
4878 * an enum type, constructors and initializers may not
4879 * reference its static members unless they are constant.
4880 *
4881 * @param tree The tree making up the variable reference.
4882 * @param env The current environment.
4883 * @param v The variable's symbol.
4884 * @jls 8.9 Enum Types
4885 */
4886 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4887 // JLS:
4888 //
4889 // "It is a compile-time error to reference a static field
4890 // of an enum type that is not a compile-time constant
4891 // (15.28) from constructors, instance initializer blocks,
4892 // or instance variable initializer expressions of that
4893 // type. It is a compile-time error for the constructors,
4894 // instance initializer blocks, or instance variable
4895 // initializer expressions of an enum constant e to refer
4896 // to itself or to an enum constant of the same type that
4897 // is declared to the right of e."
4898 if (isStaticEnumField(v)) {
4899 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4900
4901 if (enclClass == null || enclClass.owner == null)
4902 return;
4903
4904 // See if the enclosing class is the enum (or a
4905 // subclass thereof) declaring v. If not, this
4906 // reference is OK.
4907 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4908 return;
4909
4910 // If the reference isn't from an initializer, then
4911 // the reference is OK.
4912 if (!Resolve.isInitializer(env))
4913 return;
4914
4915 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4916 }
4917 }
4918
4919 /** Is the given symbol a static, non-constant field of an Enum?
4920 * Note: enum literals should not be regarded as such
4921 */
4922 private boolean isStaticEnumField(VarSymbol v) {
4923 return Flags.isEnum(v.owner) &&
4924 Flags.isStatic(v) &&
4925 !Flags.isConstant(v) &&
4926 v.name != names._class;
4927 }
4928
4929 /**
4930 * Check that method arguments conform to its instantiation.
4931 **/
4932 public Type checkMethod(Type site,
4933 final Symbol sym,
4934 ResultInfo resultInfo,
4935 Env<AttrContext> env,
4936 final List<JCExpression> argtrees,
4937 List<Type> argtypes,
4938 List<Type> typeargtypes) {
4939 // Test (5): if symbol is an instance method of a raw type, issue
4940 // an unchecked warning if its argument types change under erasure.
4941 if ((sym.flags() & STATIC) == 0 &&
4942 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4943 Type s = types.asOuterSuper(site, sym.owner);
4944 if (s != null && s.isRaw() &&
4945 !types.isSameTypes(sym.type.getParameterTypes(),
4946 sym.erasure(types).getParameterTypes())) {
4947 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4948 }
4949 }
4950
4951 if (env.info.defaultSuperCallSite != null) {
4952 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4953 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4954 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4955 List<MethodSymbol> icand_sup =
4956 types.interfaceCandidates(sup, (MethodSymbol)sym);
4957 if (icand_sup.nonEmpty() &&
4958 icand_sup.head != sym &&
4959 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4960 log.error(env.tree.pos(),
4961 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4962 break;
4963 }
4964 }
4965 env.info.defaultSuperCallSite = null;
4966 }
4967
4968 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4969 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4970 if (app.meth.hasTag(SELECT) &&
4971 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4972 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4973 }
4974 }
4975
4976 // Compute the identifier's instantiated type.
4977 // For methods, we need to compute the instance type by
4978 // Resolve.instantiate from the symbol's type as well as
4979 // any type arguments and value arguments.
4980 Warner noteWarner = new Warner();
4981 try {
4982 Type owntype = rs.checkMethod(
4983 env,
4984 site,
4985 sym,
4986 resultInfo,
4987 argtypes,
4988 typeargtypes,
4989 noteWarner);
4990
4991 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4992 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4993
4994 argtypes = argtypes.map(checkDeferredMap);
4995
4996 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4997 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4998 sym.name,
4999 rs.methodArguments(sym.type.getParameterTypes()),
5000 rs.methodArguments(argtypes.map(checkDeferredMap)),
5001 kindName(sym.location()),
5002 sym.location()));
5003 if (resultInfo.pt != Infer.anyPoly ||
5004 !owntype.hasTag(METHOD) ||
5005 !owntype.isPartial()) {
5006 //if this is not a partially inferred method type, erase return type. Otherwise,
5007 //erasure is carried out in PartiallyInferredMethodType.check().
5008 owntype = new MethodType(owntype.getParameterTypes(),
5009 types.erasure(owntype.getReturnType()),
5010 types.erasure(owntype.getThrownTypes()),
5011 syms.methodClass);
5012 }
5013 }
5014
5015 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5016 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5017 PolyKind.POLY : PolyKind.STANDALONE;
5018 TreeInfo.setPolyKind(env.tree, pkind);
5019
5020 return (resultInfo.pt == Infer.anyPoly) ?
5021 owntype :
5022 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5023 resultInfo.checkContext.inferenceContext());
5024 } catch (Infer.InferenceException ex) {
5025 //invalid target type - propagate exception outwards or report error
5026 //depending on the current check context
5027 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5028 return types.createErrorType(site);
5029 } catch (Resolve.InapplicableMethodException ex) {
5030 final JCDiagnostic diag = ex.getDiagnostic();
5031 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5032 @Override
5033 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5034 return new Pair<>(sym, diag);
5035 }
5036 };
5037 List<Type> argtypes2 = argtypes.map(
5038 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5039 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5040 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5041 log.report(errDiag);
5042 return types.createErrorType(site);
5043 }
5044 }
5045
5046 public void visitDefaultValue(JCDefaultValue tree) {
5047 if (!allowPrimitiveClasses) {
5048 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
5049 Feature.PRIMITIVE_CLASSES.error(sourceName));
5050 }
5051
5052 // Attribute the qualifier expression, and determine its symbol (if any).
5053 Type site = attribTree(tree.clazz, env, new ResultInfo(KindSelector.TYP_PCK, Type.noType));
5054 if (!pkind().contains(KindSelector.TYP_PCK))
5055 site = capture(site); // Capture field access
5056
5057 Symbol sym = switch (site.getTag()) {
5058 case WILDCARD -> throw new AssertionError(tree);
5059 case PACKAGE -> {
5060 log.error(tree.pos, Errors.CantResolveLocation(Kinds.KindName.CLASS, site.tsym.getQualifiedName(), null, null,
5061 Fragments.Location(Kinds.typeKindName(env.enclClass.type), env.enclClass.type, null)));
5062 yield syms.errSymbol;
5063 }
5064 case ERROR -> types.createErrorType(names._default, site.tsym, site).tsym;
5065 default -> new VarSymbol(STATIC, names._default, site, site.tsym);
5066 };
5067
5068 if (site.hasTag(TYPEVAR) && sym.kind != ERR) {
5069 site = types.skipTypeVars(site, true);
5070 }
5071 result = checkId(tree, site, sym, env, resultInfo);
5072 }
5073
5074 public void visitLiteral(JCLiteral tree) {
5075 result = check(tree, litType(tree.typetag).constType(tree.value),
5076 KindSelector.VAL, resultInfo);
5077 }
5078 //where
5079 /** Return the type of a literal with given type tag.
5080 */
5081 Type litType(TypeTag tag) {
5082 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5083 }
5084
5085 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5086 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5087 }
5088
5089 public void visitTypeArray(JCArrayTypeTree tree) {
5090 Type etype = attribType(tree.elemtype, env);
5091 Type type = new ArrayType(etype, syms.arrayClass);
5092 result = check(tree, type, KindSelector.TYP, resultInfo);
5093 }
5094
5095 /** Visitor method for parameterized types.
5096 * Bound checking is left until later, since types are attributed
5097 * before supertype structure is completely known
5098 */
5099 public void visitTypeApply(JCTypeApply tree) {
5100 Type owntype = types.createErrorType(tree.type);
5101
5102 // Attribute functor part of application and make sure it's a class.
5103 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5104
5105 // Attribute type parameters
5106 List<Type> actuals = attribTypes(tree.arguments, env);
5107
5108 if (clazztype.hasTag(CLASS)) {
5109 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5110 if (actuals.isEmpty()) //diamond
5111 actuals = formals;
5112
5113 if (actuals.length() == formals.length()) {
5114 List<Type> a = actuals;
5115 List<Type> f = formals;
5116 while (a.nonEmpty()) {
5117 a.head = a.head.withTypeVar(f.head);
5118 a = a.tail;
5119 f = f.tail;
5120 }
5121 // Compute the proper generic outer
5122 Type clazzOuter = clazztype.getEnclosingType();
5123 if (clazzOuter.hasTag(CLASS)) {
5124 Type site;
5125 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5126 if (clazz.hasTag(IDENT)) {
5127 site = env.enclClass.sym.type;
5128 } else if (clazz.hasTag(SELECT)) {
5129 site = ((JCFieldAccess) clazz).selected.type;
5130 } else throw new AssertionError(""+tree);
5131 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5132 if (site.hasTag(CLASS))
5133 site = types.asOuterSuper(site, clazzOuter.tsym);
5134 if (site == null)
5135 site = types.erasure(clazzOuter);
5136 clazzOuter = site;
5137 }
5138 }
5139 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5140 clazztype.getMetadata(), clazztype.getFlavor());
5141 } else {
5142 if (formals.length() != 0) {
5143 log.error(tree.pos(),
5144 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5145 } else {
5146 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5147 }
5148 owntype = types.createErrorType(tree.type);
5149 }
5150 }
5151 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5152 }
5153
5154 public void visitTypeUnion(JCTypeUnion tree) {
5155 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5156 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5157 for (JCExpression typeTree : tree.alternatives) {
5158 Type ctype = attribType(typeTree, env);
5159 ctype = chk.checkType(typeTree.pos(),
5160 chk.checkClassType(typeTree.pos(), ctype),
5161 syms.throwableType);
5162 if (!ctype.isErroneous()) {
5163 //check that alternatives of a union type are pairwise
5164 //unrelated w.r.t. subtyping
5165 if (chk.intersects(ctype, multicatchTypes.toList())) {
5166 for (Type t : multicatchTypes) {
5167 boolean sub = types.isSubtype(ctype, t);
5168 boolean sup = types.isSubtype(t, ctype);
5169 if (sub || sup) {
5170 //assume 'a' <: 'b'
5171 Type a = sub ? ctype : t;
5172 Type b = sub ? t : ctype;
5173 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5174 }
5175 }
5176 }
5177 multicatchTypes.append(ctype);
5178 if (all_multicatchTypes != null)
5179 all_multicatchTypes.append(ctype);
5180 } else {
5181 if (all_multicatchTypes == null) {
5182 all_multicatchTypes = new ListBuffer<>();
5183 all_multicatchTypes.appendList(multicatchTypes);
5184 }
5185 all_multicatchTypes.append(ctype);
5186 }
5187 }
5188 Type t = check(tree, types.lub(multicatchTypes.toList()),
5189 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5190 if (t.hasTag(CLASS)) {
5191 List<Type> alternatives =
5192 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5193 t = new UnionClassType((ClassType) t, alternatives);
5194 }
5195 tree.type = result = t;
5196 }
5197
5198 public void visitTypeIntersection(JCTypeIntersection tree) {
5199 attribTypes(tree.bounds, env);
5200 tree.type = result = checkIntersection(tree, tree.bounds);
5201 }
5202
5203 public void visitTypeParameter(JCTypeParameter tree) {
5204 TypeVar typeVar = (TypeVar) tree.type;
5205
5206 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5207 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5208 }
5209
5210 if (!typeVar.getUpperBound().isErroneous()) {
5211 //fixup type-parameter bound computed in 'attribTypeVariables'
5212 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5213 }
5214 }
5215
5216 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5217 Set<Type> boundSet = new HashSet<>();
5218 if (bounds.nonEmpty()) {
5219 // accept class or interface or typevar as first bound.
5220 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5221 boundSet.add(types.erasure(bounds.head.type));
5222 if (bounds.head.type.isErroneous()) {
5223 return bounds.head.type;
5224 }
5225 else if (bounds.head.type.hasTag(TYPEVAR)) {
5226 // if first bound was a typevar, do not accept further bounds.
5227 if (bounds.tail.nonEmpty()) {
5228 log.error(bounds.tail.head.pos(),
5229 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5230 return bounds.head.type;
5231 }
5232 } else {
5233 // if first bound was a class or interface, accept only interfaces
5234 // as further bounds.
5235 for (JCExpression bound : bounds.tail) {
5236 bound.type = checkBase(bound.type, bound, env, false, true, false);
5237 if (bound.type.isErroneous()) {
5238 bounds = List.of(bound);
5239 }
5240 else if (bound.type.hasTag(CLASS)) {
5241 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5242 }
5243 }
5244 }
5245 }
5246
5247 if (bounds.length() == 0) {
5248 return syms.objectType;
5249 } else if (bounds.length() == 1) {
5250 return bounds.head.type;
5251 } else {
5252 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5253 // ... the variable's bound is a class type flagged COMPOUND
5254 // (see comment for TypeVar.bound).
5255 // In this case, generate a class tree that represents the
5256 // bound class, ...
5257 JCExpression extending;
5258 List<JCExpression> implementing;
5259 if (!bounds.head.type.isInterface()) {
5260 extending = bounds.head;
5261 implementing = bounds.tail;
5262 } else {
5263 extending = null;
5264 implementing = bounds;
5265 }
5266 JCClassDecl cd = make.at(tree).ClassDef(
5267 make.Modifiers(PUBLIC | ABSTRACT | (extending != null && TreeInfo.symbol(extending).isPrimitiveClass() ? PRIMITIVE_CLASS : 0)),
5268 names.empty, List.nil(),
5269 extending, implementing, List.nil());
5270
5271 ClassSymbol c = (ClassSymbol)owntype.tsym;
5272 Assert.check((c.flags() & COMPOUND) != 0);
5273 cd.sym = c;
5274 c.sourcefile = env.toplevel.sourcefile;
5275
5276 // ... and attribute the bound class
5277 c.flags_field |= UNATTRIBUTED;
5278 Env<AttrContext> cenv = enter.classEnv(cd, env);
5279 typeEnvs.put(c, cenv);
5280 attribClass(c);
5281 return owntype;
5282 }
5283 }
5284
5285 public void visitWildcard(JCWildcard tree) {
5286 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5287 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5288 ? syms.objectType
5289 : attribType(tree.inner, env);
5290 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type, false),
5291 tree.kind.kind,
5292 syms.boundClass),
5293 KindSelector.TYP, resultInfo);
5294 }
5295
5296 public void visitAnnotation(JCAnnotation tree) {
5297 Assert.error("should be handled in annotate");
5298 }
5299
5300 public void visitAnnotatedType(JCAnnotatedType tree) {
5301 attribAnnotationTypes(tree.annotations, env);
5302 Type underlyingType = attribType(tree.underlyingType, env);
5303 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5304
5305 if (!env.info.isNewClass)
5306 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5307 result = tree.type = annotatedType;
5308 }
5309
5310 public void visitErroneous(JCErroneous tree) {
5311 if (tree.errs != null) {
5312 Env<AttrContext> errEnv = env.dup(env.tree);
5313 errEnv.info.returnResult = unknownExprInfo;
5314 for (JCTree err : tree.errs)
5315 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5316 }
5317 result = tree.type = syms.errType;
5318 }
5319
5320 /** Default visitor method for all other trees.
5321 */
5322 public void visitTree(JCTree tree) {
5323 throw new AssertionError();
5324 }
5325
5326 /**
5327 * Attribute an env for either a top level tree or class or module declaration.
5328 */
5329 public void attrib(Env<AttrContext> env) {
5330 switch (env.tree.getTag()) {
5331 case MODULEDEF:
5332 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5333 break;
5334 case TOPLEVEL:
5335 attribTopLevel(env);
5336 break;
5337 case PACKAGEDEF:
5338 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5339 break;
5340 default:
5341 attribClass(env.tree.pos(), env.enclClass.sym);
5342 }
5343 }
5344
5345 /**
5346 * Attribute a top level tree. These trees are encountered when the
5347 * package declaration has annotations.
5348 */
5349 public void attribTopLevel(Env<AttrContext> env) {
5350 JCCompilationUnit toplevel = env.toplevel;
5351 try {
5352 annotate.flush();
5353 } catch (CompletionFailure ex) {
5354 chk.completionError(toplevel.pos(), ex);
5355 }
5356 }
5357
5358 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5359 try {
5360 annotate.flush();
5361 attribPackage(p);
5362 } catch (CompletionFailure ex) {
5363 chk.completionError(pos, ex);
5364 }
5365 }
5366
5367 void attribPackage(PackageSymbol p) {
5368 Env<AttrContext> env = typeEnvs.get(p);
5369 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
5370 }
5371
5372 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5373 try {
5374 annotate.flush();
5375 attribModule(m);
5376 } catch (CompletionFailure ex) {
5377 chk.completionError(pos, ex);
5378 }
5379 }
5380
5381 void attribModule(ModuleSymbol m) {
5382 // Get environment current at the point of module definition.
5383 Env<AttrContext> env = enter.typeEnvs.get(m);
5384 attribStat(env.tree, env);
5385 }
5386
5387 /** Main method: attribute class definition associated with given class symbol.
5388 * reporting completion failures at the given position.
5389 * @param pos The source position at which completion errors are to be
5390 * reported.
5391 * @param c The class symbol whose definition will be attributed.
5392 */
5393 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5394 try {
5395 annotate.flush();
5396 attribClass(c);
5397 if (c.isPrimitiveClass()) {
5398 final Env<AttrContext> env = typeEnvs.get(c);
5399 if (env != null && env.tree != null && env.tree.hasTag(CLASSDEF))
5400 chk.checkNonCyclicMembership((JCClassDecl)env.tree);
5401 }
5402 } catch (CompletionFailure ex) {
5403 chk.completionError(pos, ex);
5404 }
5405 }
5406
5407 /** Attribute class definition associated with given class symbol.
5408 * @param c The class symbol whose definition will be attributed.
5409 */
5410 void attribClass(ClassSymbol c) throws CompletionFailure {
5411 if (c.type.hasTag(ERROR)) return;
5412
5413 // Check for cycles in the inheritance graph, which can arise from
5414 // ill-formed class files.
5415 chk.checkNonCyclic(null, c.type);
5416
5417 Type st = types.supertype(c.type);
5418 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5419 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5420 // First, attribute superclass.
5421 if (st.hasTag(CLASS))
5422 attribClass((ClassSymbol)st.tsym);
5423
5424 // Next attribute owner, if it is a class.
5425 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5426 attribClass((ClassSymbol)c.owner);
5427
5428 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5429 }
5430
5431 // The previous operations might have attributed the current class
5432 // if there was a cycle. So we test first whether the class is still
5433 // UNATTRIBUTED.
5434 if ((c.flags_field & UNATTRIBUTED) != 0) {
5435 c.flags_field &= ~UNATTRIBUTED;
5436
5437 // Get environment current at the point of class definition.
5438 Env<AttrContext> env = typeEnvs.get(c);
5439
5440 if (c.isSealed() &&
5441 !c.isEnum() &&
5442 !c.isPermittedExplicit &&
5443 c.permitted.isEmpty()) {
5444 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5445 }
5446
5447 if (c.isSealed()) {
5448 Set<Symbol> permittedTypes = new HashSet<>();
5449 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5450 for (Symbol subTypeSym : c.permitted) {
5451 boolean isTypeVar = false;
5452 if (subTypeSym.type.getTag() == TYPEVAR) {
5453 isTypeVar = true; //error recovery
5454 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5455 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5456 }
5457 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5458 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5459 }
5460 if (permittedTypes.contains(subTypeSym)) {
5461 DiagnosticPosition pos =
5462 env.enclClass.permitting.stream()
5463 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5464 .limit(2).collect(List.collector()).get(1);
5465 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5466 } else {
5467 permittedTypes.add(subTypeSym);
5468 }
5469 if (sealedInUnnamed) {
5470 if (subTypeSym.packge() != c.packge()) {
5471 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5472 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5473 );
5474 }
5475 } else if (subTypeSym.packge().modle != c.packge().modle) {
5476 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5477 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5478 );
5479 }
5480 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5481 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5482 Errors.InvalidPermitsClause(
5483 subTypeSym == c.type.tsym ?
5484 Fragments.MustNotBeSameClass :
5485 Fragments.MustNotBeSupertype(subTypeSym.type)
5486 )
5487 );
5488 } else if (!isTypeVar) {
5489 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5490 .stream()
5491 .anyMatch(d -> d.tsym == c);
5492 if (!thisIsASuper) {
5493 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5494 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5495 }
5496 }
5497 }
5498 }
5499
5500 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5501 .stream()
5502 .filter(s -> s.tsym.isSealed())
5503 .map(s -> (ClassSymbol) s.tsym)
5504 .collect(List.collector());
5505
5506 if (sealedSupers.isEmpty()) {
5507 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5508 boolean hasErrorSuper = false;
5509
5510 hasErrorSuper |= types.directSupertypes(c.type)
5511 .stream()
5512 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5513
5514 ClassType ct = (ClassType) c.type;
5515
5516 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5517
5518 if (!hasErrorSuper) {
5519 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5520 }
5521 }
5522 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5523 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5524 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5525 }
5526
5527 if (!c.type.isCompound()) {
5528 for (ClassSymbol supertypeSym : sealedSupers) {
5529 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5530 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5531 }
5532 }
5533 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5534 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5535 c.isInterface() ?
5536 Errors.NonSealedOrSealedExpected :
5537 Errors.NonSealedSealedOrFinalExpected);
5538 }
5539 }
5540 }
5541
5542 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5543 // because the annotations were not available at the time the env was created. Therefore,
5544 // we look up the environment chain for the first enclosing environment for which the
5545 // lint value is set. Typically, this is the parent env, but might be further if there
5546 // are any envs created as a result of TypeParameter nodes.
5547 Env<AttrContext> lintEnv = env;
5548 while (lintEnv.info.lint == null)
5549 lintEnv = lintEnv.next;
5550
5551 // Having found the enclosing lint value, we can initialize the lint value for this class
5552 env.info.lint = lintEnv.info.lint.augment(c);
5553
5554 Lint prevLint = chk.setLint(env.info.lint);
5555 JavaFileObject prev = log.useSource(c.sourcefile);
5556 ResultInfo prevReturnRes = env.info.returnResult;
5557
5558 try {
5559 deferredLintHandler.flush(env.tree);
5560 env.info.returnResult = null;
5561 // java.lang.Enum may not be subclassed by a non-enum
5562 if (st.tsym == syms.enumSym &&
5563 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5564 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5565
5566 // Enums may not be extended by source-level classes
5567 if (st.tsym != null &&
5568 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5569 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5570 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5571 }
5572
5573 if (isSerializable(c.type)) {
5574 env.info.isSerializable = true;
5575 }
5576
5577 if ((c.flags() & (PRIMITIVE_CLASS | ABSTRACT)) == PRIMITIVE_CLASS) { // for non-intersection, concrete primitive classes.
5578 Assert.check(env.tree.hasTag(CLASSDEF));
5579 JCClassDecl classDecl = (JCClassDecl) env.tree;
5580 if (classDecl.extending != null) {
5581 chk.checkSuperConstraintsOfPrimitiveClass(env.tree.pos(), c);
5582 }
5583 }
5584
5585 attribClassBody(env, c);
5586
5587 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5588 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5589 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5590 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5591 } finally {
5592 env.info.returnResult = prevReturnRes;
5593 log.useSource(prev);
5594 chk.setLint(prevLint);
5595 }
5596
5597 }
5598 }
5599
5600 public void visitImport(JCImport tree) {
5601 // nothing to do
5602 }
5603
5604 public void visitModuleDef(JCModuleDecl tree) {
5605 tree.sym.completeUsesProvides();
5606 ModuleSymbol msym = tree.sym;
5607 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5608 Lint prevLint = chk.setLint(lint);
5609 chk.checkModuleName(tree);
5610 chk.checkDeprecatedAnnotation(tree, msym);
5611
5612 try {
5613 deferredLintHandler.flush(tree.pos());
5614 } finally {
5615 chk.setLint(prevLint);
5616 }
5617 }
5618
5619 /** Finish the attribution of a class. */
5620 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5621 JCClassDecl tree = (JCClassDecl)env.tree;
5622 Assert.check(c == tree.sym);
5623
5624 // Validate type parameters, supertype and interfaces.
5625 attribStats(tree.typarams, env);
5626 if (!c.isAnonymous()) {
5627 //already checked if anonymous
5628 chk.validate(tree.typarams, env);
5629 chk.validate(tree.extending, env);
5630 chk.validate(tree.implementing, env);
5631 }
5632
5633 c.markAbstractIfNeeded(types);
5634
5635 // If this is a non-abstract class, check that it has no abstract
5636 // methods or unimplemented methods of an implemented interface.
5637 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5638 chk.checkAllDefined(tree.pos(), c);
5639 }
5640
5641 if ((c.flags() & ANNOTATION) != 0) {
5642 if (tree.implementing.nonEmpty())
5643 log.error(tree.implementing.head.pos(),
5644 Errors.CantExtendIntfAnnotation);
5645 if (tree.typarams.nonEmpty()) {
5646 log.error(tree.typarams.head.pos(),
5647 Errors.IntfAnnotationCantHaveTypeParams(c));
5648 }
5649
5650 // If this annotation type has a @Repeatable, validate
5651 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5652 // If this annotation type has a @Repeatable, validate
5653 if (repeatable != null) {
5654 // get diagnostic position for error reporting
5655 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5656 Assert.checkNonNull(cbPos);
5657
5658 chk.validateRepeatable(c, repeatable, cbPos);
5659 }
5660 } else {
5661 // Check that all extended classes and interfaces
5662 // are compatible (i.e. no two define methods with same arguments
5663 // yet different return types). (JLS 8.4.6.3)
5664 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5665 if (allowDefaultMethods) {
5666 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5667 }
5668 }
5669
5670 // Check that class does not import the same parameterized interface
5671 // with two different argument lists.
5672 chk.checkClassBounds(tree.pos(), c.type);
5673
5674 tree.type = c.type;
5675
5676 for (List<JCTypeParameter> l = tree.typarams;
5677 l.nonEmpty(); l = l.tail) {
5678 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5679 }
5680
5681 // Check that a generic class doesn't extend Throwable
5682 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5683 log.error(tree.extending.pos(), Errors.GenericThrowable);
5684
5685 // Check that all methods which implement some
5686 // method conform to the method they implement.
5687 chk.checkImplementations(tree);
5688
5689 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5690 checkAutoCloseable(tree.pos(), env, c.type);
5691
5692 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5693 // Attribute declaration
5694 attribStat(l.head, env);
5695 // Check that declarations in inner classes are not static (JLS 8.1.2)
5696 // Make an exception for static constants.
5697 if (!allowRecords &&
5698 c.owner.kind != PCK &&
5699 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5700 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5701 Symbol sym = null;
5702 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5703 if (sym == null ||
5704 sym.kind != VAR ||
5705 ((VarSymbol) sym).getConstValue() == null)
5706 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5707 }
5708 }
5709
5710 // Check for cycles among non-initial constructors.
5711 chk.checkCyclicConstructors(tree);
5712
5713 // Check for cycles among annotation elements.
5714 chk.checkNonCyclicElements(tree);
5715
5716 // Check for proper use of serialVersionUID
5717 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5718 && isSerializable(c.type)
5719 && (c.flags() & (Flags.ENUM | Flags.INTERFACE)) == 0
5720 && !c.isAnonymous()) {
5721 checkSerialVersionUID(tree, c, env);
5722 }
5723 if (allowTypeAnnos) {
5724 // Correctly organize the positions of the type annotations
5725 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5726
5727 // Check type annotations applicability rules
5728 validateTypeAnnotations(tree, false);
5729 }
5730 }
5731 // where
5732 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5733 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5734 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5735 if (types.isSameType(al.head.annotationType.type, t))
5736 return al.head.pos();
5737 }
5738
5739 return null;
5740 }
5741
5742 /** check if a type is a subtype of Serializable, if that is available. */
5743 boolean isSerializable(Type t) {
5744 try {
5745 syms.serializableType.complete();
5746 }
5747 catch (CompletionFailure e) {
5748 return false;
5749 }
5750 return types.isSubtype(t, syms.serializableType);
5751 }
5752
5753 /** Check that an appropriate serialVersionUID member is defined. */
5754 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c, Env<AttrContext> env) {
5755
5756 // check for presence of serialVersionUID
5757 VarSymbol svuid = null;
5758 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) {
5759 if (sym.kind == VAR) {
5760 svuid = (VarSymbol)sym;
5761 break;
5762 }
5763 }
5764
5765 if (svuid == null) {
5766 if (!c.isRecord())
5767 log.warning(LintCategory.SERIAL, tree.pos(), Warnings.MissingSVUID(c));
5768 return;
5769 }
5770
5771 // Check if @SuppressWarnings("serial") is an annotation of serialVersionUID.
5772 // See JDK-8231622 for more information.
5773 Lint lint = env.info.lint.augment(svuid);
5774 if (lint.isSuppressed(LintCategory.SERIAL)) {
5775 return;
5776 }
5777
5778 // check that it is static final
5779 if ((svuid.flags() & (STATIC | FINAL)) !=
5780 (STATIC | FINAL))
5781 log.warning(LintCategory.SERIAL,
5782 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c));
5783
5784 // check that it is long
5785 else if (!svuid.type.hasTag(LONG))
5786 log.warning(LintCategory.SERIAL,
5787 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c));
5788
5789 // check constant
5790 else if (svuid.getConstValue() == null)
5791 log.warning(LintCategory.SERIAL,
5792 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c));
5793 }
5794
5795 private Type capture(Type type) {
5796 return types.capture(type);
5797 }
5798
5799 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5800 if (type.isErroneous()) {
5801 tree.vartype = make.at(Position.NOPOS).Erroneous();
5802 } else {
5803 tree.vartype = make.at(Position.NOPOS).Type(type);
5804 }
5805 }
5806
5807 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5808 tree.accept(new TypeAnnotationsValidator(sigOnly));
5809 }
5810 //where
5811 private final class TypeAnnotationsValidator extends TreeScanner {
5812
5813 private final boolean sigOnly;
5814 public TypeAnnotationsValidator(boolean sigOnly) {
5815 this.sigOnly = sigOnly;
5816 }
5817
5818 public void visitAnnotation(JCAnnotation tree) {
5819 chk.validateTypeAnnotation(tree, false);
5820 super.visitAnnotation(tree);
5821 }
5822 public void visitAnnotatedType(JCAnnotatedType tree) {
5823 if (!tree.underlyingType.type.isErroneous()) {
5824 super.visitAnnotatedType(tree);
5825 }
5826 }
5827 public void visitTypeParameter(JCTypeParameter tree) {
5828 chk.validateTypeAnnotations(tree.annotations, true);
5829 scan(tree.bounds);
5830 // Don't call super.
5831 // This is needed because above we call validateTypeAnnotation with
5832 // false, which would forbid annotations on type parameters.
5833 // super.visitTypeParameter(tree);
5834 }
5835 public void visitMethodDef(JCMethodDecl tree) {
5836 if (tree.recvparam != null &&
5837 !tree.recvparam.vartype.type.isErroneous()) {
5838 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5839 }
5840 if (tree.restype != null && tree.restype.type != null) {
5841 validateAnnotatedType(tree.restype, tree.restype.type);
5842 }
5843 if (sigOnly) {
5844 scan(tree.mods);
5845 scan(tree.restype);
5846 scan(tree.typarams);
5847 scan(tree.recvparam);
5848 scan(tree.params);
5849 scan(tree.thrown);
5850 } else {
5851 scan(tree.defaultValue);
5852 scan(tree.body);
5853 }
5854 }
5855 public void visitVarDef(final JCVariableDecl tree) {
5856 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5857 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5858 validateAnnotatedType(tree.vartype, tree.sym.type);
5859 scan(tree.mods);
5860 scan(tree.vartype);
5861 if (!sigOnly) {
5862 scan(tree.init);
5863 }
5864 }
5865 public void visitTypeCast(JCTypeCast tree) {
5866 if (tree.clazz != null && tree.clazz.type != null)
5867 validateAnnotatedType(tree.clazz, tree.clazz.type);
5868 super.visitTypeCast(tree);
5869 }
5870 public void visitTypeTest(JCInstanceOf tree) {
5871 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5872 validateAnnotatedType(tree.pattern, tree.pattern.type);
5873 super.visitTypeTest(tree);
5874 }
5875 public void visitNewClass(JCNewClass tree) {
5876 if (tree.clazz != null && tree.clazz.type != null) {
5877 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5878 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5879 tree.clazz.type.tsym);
5880 }
5881 if (tree.def != null) {
5882 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5883 }
5884
5885 validateAnnotatedType(tree.clazz, tree.clazz.type);
5886 }
5887 super.visitNewClass(tree);
5888 }
5889 public void visitNewArray(JCNewArray tree) {
5890 if (tree.elemtype != null && tree.elemtype.type != null) {
5891 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5892 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5893 tree.elemtype.type.tsym);
5894 }
5895 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5896 }
5897 super.visitNewArray(tree);
5898 }
5899 public void visitClassDef(JCClassDecl tree) {
5900 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5901 if (sigOnly) {
5902 scan(tree.mods);
5903 scan(tree.typarams);
5904 scan(tree.extending);
5905 scan(tree.implementing);
5906 }
5907 for (JCTree member : tree.defs) {
5908 if (member.hasTag(Tag.CLASSDEF)) {
5909 continue;
5910 }
5911 scan(member);
5912 }
5913 }
5914 public void visitBlock(JCBlock tree) {
5915 if (!sigOnly) {
5916 scan(tree.stats);
5917 }
5918 }
5919
5920 /* I would want to model this after
5921 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5922 * and override visitSelect and visitTypeApply.
5923 * However, we only set the annotated type in the top-level type
5924 * of the symbol.
5925 * Therefore, we need to override each individual location where a type
5926 * can occur.
5927 */
5928 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5929 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5930
5931 if (type.isPrimitiveOrVoid()) {
5932 return;
5933 }
5934
5935 JCTree enclTr = errtree;
5936 Type enclTy = type;
5937
5938 boolean repeat = true;
5939 while (repeat) {
5940 if (enclTr.hasTag(TYPEAPPLY)) {
5941 List<Type> tyargs = enclTy.getTypeArguments();
5942 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5943 if (trargs.length() > 0) {
5944 // Nothing to do for diamonds
5945 if (tyargs.length() == trargs.length()) {
5946 for (int i = 0; i < tyargs.length(); ++i) {
5947 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5948 }
5949 }
5950 // If the lengths don't match, it's either a diamond
5951 // or some nested type that redundantly provides
5952 // type arguments in the tree.
5953 }
5954
5955 // Look at the clazz part of a generic type
5956 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5957 }
5958
5959 if (enclTr.hasTag(SELECT)) {
5960 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5961 if (enclTy != null &&
5962 !enclTy.hasTag(NONE)) {
5963 enclTy = enclTy.getEnclosingType();
5964 }
5965 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5966 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5967 if (enclTy == null || enclTy.hasTag(NONE)) {
5968 if (at.getAnnotations().size() == 1) {
5969 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5970 } else {
5971 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5972 for (JCAnnotation an : at.getAnnotations()) {
5973 comps.add(an.attribute);
5974 }
5975 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5976 }
5977 repeat = false;
5978 }
5979 enclTr = at.underlyingType;
5980 // enclTy doesn't need to be changed
5981 } else if (enclTr.hasTag(IDENT)) {
5982 repeat = false;
5983 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5984 JCWildcard wc = (JCWildcard) enclTr;
5985 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5986 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5987 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5988 } else {
5989 // Nothing to do for UNBOUND
5990 }
5991 repeat = false;
5992 } else if (enclTr.hasTag(TYPEARRAY)) {
5993 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5994 validateAnnotatedType(art.getType(), art.elemtype.type);
5995 repeat = false;
5996 } else if (enclTr.hasTag(TYPEUNION)) {
5997 JCTypeUnion ut = (JCTypeUnion) enclTr;
5998 for (JCTree t : ut.getTypeAlternatives()) {
5999 validateAnnotatedType(t, t.type);
6000 }
6001 repeat = false;
6002 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6003 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6004 for (JCTree t : it.getBounds()) {
6005 validateAnnotatedType(t, t.type);
6006 }
6007 repeat = false;
6008 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6009 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6010 repeat = false;
6011 } else {
6012 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6013 " within: "+ errtree + " with kind: " + errtree.getKind());
6014 }
6015 }
6016 }
6017
6018 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6019 Symbol sym) {
6020 // Ensure that no declaration annotations are present.
6021 // Note that a tree type might be an AnnotatedType with
6022 // empty annotations, if only declaration annotations were given.
6023 // This method will raise an error for such a type.
6024 for (JCAnnotation ai : annotations) {
6025 if (!ai.type.isErroneous() &&
6026 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6027 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6028 }
6029 }
6030 }
6031 }
6032
6033 // <editor-fold desc="post-attribution visitor">
6034
6035 /**
6036 * Handle missing types/symbols in an AST. This routine is useful when
6037 * the compiler has encountered some errors (which might have ended up
6038 * terminating attribution abruptly); if the compiler is used in fail-over
6039 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6040 * prevents NPE to be propagated during subsequent compilation steps.
6041 */
6042 public void postAttr(JCTree tree) {
6043 new PostAttrAnalyzer().scan(tree);
6044 }
6045
6046 class PostAttrAnalyzer extends TreeScanner {
6047
6048 private void initTypeIfNeeded(JCTree that) {
6049 if (that.type == null) {
6050 if (that.hasTag(METHODDEF)) {
6051 that.type = dummyMethodType((JCMethodDecl)that);
6052 } else {
6053 that.type = syms.unknownType;
6054 }
6055 }
6056 }
6057
6058 /* Construct a dummy method type. If we have a method declaration,
6059 * and the declared return type is void, then use that return type
6060 * instead of UNKNOWN to avoid spurious error messages in lambda
6061 * bodies (see:JDK-8041704).
6062 */
6063 private Type dummyMethodType(JCMethodDecl md) {
6064 Type restype = syms.unknownType;
6065 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6066 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6067 if (prim.typetag == VOID)
6068 restype = syms.voidType;
6069 }
6070 return new MethodType(List.nil(), restype,
6071 List.nil(), syms.methodClass);
6072 }
6073 private Type dummyMethodType() {
6074 return dummyMethodType(null);
6075 }
6076
6077 @Override
6078 public void scan(JCTree tree) {
6079 if (tree == null) return;
6080 if (tree instanceof JCExpression) {
6081 initTypeIfNeeded(tree);
6082 }
6083 super.scan(tree);
6084 }
6085
6086 @Override
6087 public void visitIdent(JCIdent that) {
6088 if (that.sym == null) {
6089 that.sym = syms.unknownSymbol;
6090 }
6091 }
6092
6093 @Override
6094 public void visitSelect(JCFieldAccess that) {
6095 if (that.sym == null) {
6096 that.sym = syms.unknownSymbol;
6097 }
6098 super.visitSelect(that);
6099 }
6100
6101 @Override
6102 public void visitClassDef(JCClassDecl that) {
6103 initTypeIfNeeded(that);
6104 if (that.sym == null) {
6105 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6106 }
6107 super.visitClassDef(that);
6108 }
6109
6110 @Override
6111 public void visitMethodDef(JCMethodDecl that) {
6112 initTypeIfNeeded(that);
6113 if (that.sym == null) {
6114 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6115 }
6116 super.visitMethodDef(that);
6117 }
6118
6119 @Override
6120 public void visitVarDef(JCVariableDecl that) {
6121 initTypeIfNeeded(that);
6122 if (that.sym == null) {
6123 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6124 that.sym.adr = 0;
6125 }
6126 if (that.vartype == null) {
6127 that.vartype = make.at(Position.NOPOS).Erroneous();
6128 }
6129 super.visitVarDef(that);
6130 }
6131
6132 @Override
6133 public void visitBindingPattern(JCBindingPattern that) {
6134 if (that.var.sym == null) {
6135 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6136 that.var.sym.adr = 0;
6137 }
6138 super.visitBindingPattern(that);
6139 }
6140
6141 @Override
6142 public void visitNewClass(JCNewClass that) {
6143 if (that.constructor == null) {
6144 that.constructor = new MethodSymbol(0, names.init,
6145 dummyMethodType(), syms.noSymbol);
6146 }
6147 if (that.constructorType == null) {
6148 that.constructorType = syms.unknownType;
6149 }
6150 super.visitNewClass(that);
6151 }
6152
6153 @Override
6154 public void visitAssignop(JCAssignOp that) {
6155 if (that.operator == null) {
6156 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6157 -1, syms.noSymbol);
6158 }
6159 super.visitAssignop(that);
6160 }
6161
6162 @Override
6163 public void visitBinary(JCBinary that) {
6164 if (that.operator == null) {
6165 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6166 -1, syms.noSymbol);
6167 }
6168 super.visitBinary(that);
6169 }
6170
6171 @Override
6172 public void visitUnary(JCUnary that) {
6173 if (that.operator == null) {
6174 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6175 -1, syms.noSymbol);
6176 }
6177 super.visitUnary(that);
6178 }
6179
6180 @Override
6181 public void visitReference(JCMemberReference that) {
6182 super.visitReference(that);
6183 if (that.sym == null) {
6184 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6185 syms.noSymbol);
6186 }
6187 }
6188 }
6189 // </editor-fold>
6190
6191 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6192 new TreeScanner() {
6193 Symbol packge = pkg;
6194 @Override
6195 public void visitIdent(JCIdent that) {
6196 that.sym = packge;
6197 }
6198
6199 @Override
6200 public void visitSelect(JCFieldAccess that) {
6201 that.sym = packge;
6202 packge = packge.owner;
6203 super.visitSelect(that);
6204 }
6205 }.scan(pid);
6206 }
6207
6208 }