1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.stream.Collectors;
31
32 import javax.lang.model.element.ElementKind;
33 import javax.tools.JavaFileObject;
34
35 import com.sun.source.tree.CaseTree;
36 import com.sun.source.tree.IdentifierTree;
37 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
38 import com.sun.source.tree.MemberSelectTree;
39 import com.sun.source.tree.TreeVisitor;
40 import com.sun.source.util.SimpleTreeVisitor;
41 import com.sun.tools.javac.code.*;
42 import com.sun.tools.javac.code.Lint.LintCategory;
43 import com.sun.tools.javac.code.Scope.WriteableScope;
44 import com.sun.tools.javac.code.Source.Feature;
45 import com.sun.tools.javac.code.Symbol.*;
46 import com.sun.tools.javac.code.Type.*;
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.BindingSymbol;
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.Warnings;
60 import com.sun.tools.javac.tree.*;
61 import com.sun.tools.javac.tree.JCTree.*;
62 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
63 import com.sun.tools.javac.util.*;
64 import com.sun.tools.javac.util.DefinedBy.Api;
65 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
66 import com.sun.tools.javac.util.JCDiagnostic.Error;
67 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
68 import com.sun.tools.javac.util.JCDiagnostic.Warning;
69 import com.sun.tools.javac.util.List;
70
71 import static com.sun.tools.javac.code.Flags.*;
72 import static com.sun.tools.javac.code.Flags.ANNOTATION;
73 import static com.sun.tools.javac.code.Flags.BLOCK;
74 import static com.sun.tools.javac.code.Kinds.*;
75 import static com.sun.tools.javac.code.Kinds.Kind.*;
76 import static com.sun.tools.javac.code.TypeTag.*;
77 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
78 import static com.sun.tools.javac.tree.JCTree.Tag.*;
79 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
80
81 /** This is the main context-dependent analysis phase in GJC. It
82 * encompasses name resolution, type checking and constant folding as
83 * subtasks. Some subtasks involve auxiliary classes.
84 * @see Check
85 * @see Resolve
86 * @see ConstFold
87 * @see Infer
88 *
89 * <p><b>This is NOT part of any supported API.
90 * If you write code that depends on this, you do so at your own risk.
91 * This code and its internal interfaces are subject to change or
92 * deletion without notice.</b>
93 */
94 public class Attr extends JCTree.Visitor {
95 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
96
97 final Names names;
98 final Log log;
99 final Symtab syms;
100 final Resolve rs;
101 final Operators operators;
102 final Infer infer;
103 final Analyzer analyzer;
104 final DeferredAttr deferredAttr;
105 final Check chk;
106 final Flow flow;
107 final MemberEnter memberEnter;
108 final TypeEnter typeEnter;
109 final TreeMaker make;
110 final ConstFold cfolder;
111 final Enter enter;
112 final Target target;
113 final Types types;
114 final Preview preview;
115 final JCDiagnostic.Factory diags;
116 final TypeAnnotations typeAnnotations;
117 final DeferredLintHandler deferredLintHandler;
118 final TypeEnvs typeEnvs;
119 final Dependencies dependencies;
120 final Annotate annotate;
121 final ArgumentAttr argumentAttr;
122 final MatchBindingsComputer matchBindingsComputer;
123
124 public static Attr instance(Context context) {
125 Attr instance = context.get(attrKey);
126 if (instance == null)
127 instance = new Attr(context);
128 return instance;
129 }
130
131 protected Attr(Context context) {
132 context.put(attrKey, this);
133
134 names = Names.instance(context);
135 log = Log.instance(context);
136 syms = Symtab.instance(context);
137 rs = Resolve.instance(context);
138 operators = Operators.instance(context);
139 chk = Check.instance(context);
140 flow = Flow.instance(context);
141 memberEnter = MemberEnter.instance(context);
142 typeEnter = TypeEnter.instance(context);
143 make = TreeMaker.instance(context);
144 enter = Enter.instance(context);
145 infer = Infer.instance(context);
146 analyzer = Analyzer.instance(context);
147 deferredAttr = DeferredAttr.instance(context);
148 cfolder = ConstFold.instance(context);
149 target = Target.instance(context);
150 types = Types.instance(context);
151 preview = Preview.instance(context);
152 diags = JCDiagnostic.Factory.instance(context);
153 annotate = Annotate.instance(context);
154 typeAnnotations = TypeAnnotations.instance(context);
155 deferredLintHandler = DeferredLintHandler.instance(context);
156 typeEnvs = TypeEnvs.instance(context);
157 dependencies = Dependencies.instance(context);
158 argumentAttr = ArgumentAttr.instance(context);
159 matchBindingsComputer = MatchBindingsComputer.instance(context);
160
161 Options options = Options.instance(context);
162
163 Source source = Source.instance(context);
164 allowPoly = Feature.POLY.allowedInSource(source);
165 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
166 allowLambda = Feature.LAMBDA.allowedInSource(source);
167 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
168 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
169 allowReifiableTypesInInstanceof =
170 Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source) &&
171 (!preview.isPreview(Feature.REIFIABLE_TYPES_INSTANCEOF) || preview.isEnabled());
172 sourceName = source.name;
173 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
174
175 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
176 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
177 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
178 methodAttrInfo = new MethodAttrInfo();
179 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
180 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
181 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
182 }
183
184 /** Switch: support target-typing inference
185 */
186 boolean allowPoly;
187
188 /** Switch: support type annotations.
189 */
190 boolean allowTypeAnnos;
191
192 /** Switch: support lambda expressions ?
193 */
194 boolean allowLambda;
195
196 /** Switch: support default methods ?
197 */
198 boolean allowDefaultMethods;
199
200 /** Switch: static interface methods enabled?
201 */
202 boolean allowStaticInterfaceMethods;
203
204 /** Switch: reifiable types in instanceof enabled?
205 */
206 boolean allowReifiableTypesInInstanceof;
207
208 /**
209 * Switch: warn about use of variable before declaration?
210 * RFE: 6425594
211 */
212 boolean useBeforeDeclarationWarning;
213
214 /**
215 * Switch: name of source level; used for error reporting.
216 */
217 String sourceName;
218
219 /** Check kind and type of given tree against protokind and prototype.
220 * If check succeeds, store type in tree and return it.
221 * If check fails, store errType in tree and return it.
222 * No checks are performed if the prototype is a method type.
223 * It is not necessary in this case since we know that kind and type
224 * are correct.
225 *
226 * @param tree The tree whose kind and type is checked
227 * @param found The computed type of the tree
228 * @param ownkind The computed kind of the tree
229 * @param resultInfo The expected result of the tree
230 */
231 Type check(final JCTree tree,
232 final Type found,
233 final KindSelector ownkind,
234 final ResultInfo resultInfo) {
235 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
236 Type owntype;
237 boolean shouldCheck = !found.hasTag(ERROR) &&
238 !resultInfo.pt.hasTag(METHOD) &&
239 !resultInfo.pt.hasTag(FORALL);
240 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
241 log.error(tree.pos(),
242 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
243 ownkind.kindNames()));
244 owntype = types.createErrorType(found);
245 } else if (allowPoly && inferenceContext.free(found)) {
246 //delay the check if there are inference variables in the found type
247 //this means we are dealing with a partially inferred poly expression
248 owntype = shouldCheck ? resultInfo.pt : found;
249 if (resultInfo.checkMode.installPostInferenceHook()) {
250 inferenceContext.addFreeTypeListener(List.of(found),
251 instantiatedContext -> {
252 ResultInfo pendingResult =
253 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
254 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
255 });
256 }
257 } else {
258 owntype = shouldCheck ?
259 resultInfo.check(tree, found) :
260 found;
261 }
262 if (resultInfo.checkMode.updateTreeType()) {
263 tree.type = owntype;
264 }
265 return owntype;
266 }
267
268 /** Is given blank final variable assignable, i.e. in a scope where it
269 * may be assigned to even though it is final?
270 * @param v The blank final variable.
271 * @param env The current environment.
272 */
273 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
274 Symbol owner = env.info.scope.owner;
275 // owner refers to the innermost variable, method or
276 // initializer block declaration at this point.
277 return
278 v.owner == owner
279 ||
280 ((owner.name == names.init || // i.e. we are in a constructor
281 owner.kind == VAR || // i.e. we are in a variable initializer
282 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
283 &&
284 v.owner == owner.owner
285 &&
286 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
287 }
288
289 /** Check that variable can be assigned to.
290 * @param pos The current source code position.
291 * @param v The assigned variable
292 * @param base If the variable is referred to in a Select, the part
293 * to the left of the `.', null otherwise.
294 * @param env The current environment.
295 */
296 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
297 if (v.name == names._this) {
298 log.error(pos, Errors.CantAssignValToThis);
299 } else if ((v.flags() & FINAL) != 0 &&
300 ((v.flags() & HASINIT) != 0
301 ||
302 !((base == null ||
303 TreeInfo.isThisQualifier(base)) &&
304 isAssignableAsBlankFinal(v, env)))) {
305 if (v.isResourceVariable()) { //TWR resource
306 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
307 } else if ((v.flags() & MATCH_BINDING) != 0) {
308 log.error(pos, Errors.PatternBindingMayNotBeAssigned(v));
309 } else {
310 log.error(pos, Errors.CantAssignValToFinalVar(v));
311 }
312 }
313 }
314
315 /** Does tree represent a static reference to an identifier?
316 * It is assumed that tree is either a SELECT or an IDENT.
317 * We have to weed out selects from non-type names here.
318 * @param tree The candidate tree.
319 */
320 boolean isStaticReference(JCTree tree) {
321 if (tree.hasTag(SELECT)) {
322 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
323 if (lsym == null || lsym.kind != TYP) {
324 return false;
325 }
326 }
327 return true;
328 }
329
330 /** Is this symbol a type?
331 */
332 static boolean isType(Symbol sym) {
333 return sym != null && sym.kind == TYP;
334 }
335
336 /** The current `this' symbol.
337 * @param env The current environment.
338 */
339 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
340 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
341 }
342
343 /** Attribute a parsed identifier.
344 * @param tree Parsed identifier name
345 * @param topLevel The toplevel to use
346 */
347 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
348 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
349 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
350 syms.errSymbol.name,
351 null, null, null, null);
352 localEnv.enclClass.sym = syms.errSymbol;
353 return attribIdent(tree, localEnv);
354 }
355
356 /** Attribute a parsed identifier.
357 * @param tree Parsed identifier name
358 * @param env The env to use
359 */
360 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
361 return tree.accept(identAttributer, env);
362 }
363 // where
364 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
365 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
366 @Override @DefinedBy(Api.COMPILER_TREE)
367 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
368 Symbol site = visit(node.getExpression(), env);
369 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
370 return site;
371 Name name = (Name)node.getIdentifier();
372 if (site.kind == PCK) {
373 env.toplevel.packge = (PackageSymbol)site;
374 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
375 KindSelector.TYP_PCK);
376 } else {
377 env.enclClass.sym = (ClassSymbol)site;
378 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
379 }
380 }
381
382 @Override @DefinedBy(Api.COMPILER_TREE)
383 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
384 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
385 }
386 }
387
388 public Type coerce(Type etype, Type ttype) {
389 return cfolder.coerce(etype, ttype);
390 }
391
392 public Type attribType(JCTree node, TypeSymbol sym) {
393 Env<AttrContext> env = typeEnvs.get(sym);
394 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
395 return attribTree(node, localEnv, unknownTypeInfo);
396 }
397
398 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
399 // Attribute qualifying package or class.
400 JCFieldAccess s = (JCFieldAccess)tree.qualid;
401 return attribTree(s.selected, env,
402 new ResultInfo(tree.staticImport ?
403 KindSelector.TYP : KindSelector.TYP_PCK,
404 Type.noType));
405 }
406
407 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
408 return attribToTree(expr, env, tree, unknownExprInfo);
409 }
410
411 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
412 return attribToTree(stmt, env, tree, statInfo);
413 }
414
415 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
416 breakTree = tree;
417 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
418 try {
419 deferredAttr.attribSpeculative(root, env, resultInfo,
420 null, DeferredAttr.AttributionMode.ANALYZER,
421 argumentAttr.withLocalCacheContext());
422 } catch (BreakAttr b) {
423 return b.env;
424 } catch (AssertionError ae) {
425 if (ae.getCause() instanceof BreakAttr) {
426 return ((BreakAttr)(ae.getCause())).env;
427 } else {
428 throw ae;
429 }
430 } finally {
431 breakTree = null;
432 log.useSource(prev);
433 }
434 return env;
435 }
436
437 private JCTree breakTree = null;
438
439 private static class BreakAttr extends RuntimeException {
440 static final long serialVersionUID = -6924771130405446405L;
441 private transient Env<AttrContext> env;
442 private BreakAttr(Env<AttrContext> env) {
443 this.env = env;
444 }
445 }
446
447 /**
448 * Mode controlling behavior of Attr.Check
449 */
450 enum CheckMode {
451
452 NORMAL,
453
454 /**
455 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
456 * that the captured var cache in {@code InferenceContext} will be used in read-only
457 * mode when performing inference checks.
458 */
459 NO_TREE_UPDATE {
460 @Override
461 public boolean updateTreeType() {
462 return false;
463 }
464 },
465 /**
466 * Mode signalling that caller will manage free types in tree decorations.
467 */
468 NO_INFERENCE_HOOK {
469 @Override
470 public boolean installPostInferenceHook() {
471 return false;
472 }
473 };
474
475 public boolean updateTreeType() {
476 return true;
477 }
478 public boolean installPostInferenceHook() {
479 return true;
480 }
481 }
482
483
484 class ResultInfo {
485 final KindSelector pkind;
486 final Type pt;
487 final CheckContext checkContext;
488 final CheckMode checkMode;
489
490 ResultInfo(KindSelector pkind, Type pt) {
491 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
492 }
493
494 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
495 this(pkind, pt, chk.basicHandler, checkMode);
496 }
497
498 protected ResultInfo(KindSelector pkind,
499 Type pt, CheckContext checkContext) {
500 this(pkind, pt, checkContext, CheckMode.NORMAL);
501 }
502
503 protected ResultInfo(KindSelector pkind,
504 Type pt, CheckContext checkContext, CheckMode checkMode) {
505 this.pkind = pkind;
506 this.pt = pt;
507 this.checkContext = checkContext;
508 this.checkMode = checkMode;
509 }
510
511 /**
512 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
513 * @param tree The tree to be type-checked.
514 * @return true if {@ArgumentAttr} should be used.
515 */
516 protected boolean needsArgumentAttr(JCTree tree) { return false; }
517
518 protected Type check(final DiagnosticPosition pos, final Type found) {
519 return chk.checkType(pos, found, pt, checkContext);
520 }
521
522 protected ResultInfo dup(Type newPt) {
523 return new ResultInfo(pkind, newPt, checkContext, checkMode);
524 }
525
526 protected ResultInfo dup(CheckContext newContext) {
527 return new ResultInfo(pkind, pt, newContext, checkMode);
528 }
529
530 protected ResultInfo dup(Type newPt, CheckContext newContext) {
531 return new ResultInfo(pkind, newPt, newContext, checkMode);
532 }
533
534 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
535 return new ResultInfo(pkind, newPt, newContext, newMode);
536 }
537
538 protected ResultInfo dup(CheckMode newMode) {
539 return new ResultInfo(pkind, pt, checkContext, newMode);
540 }
541
542 @Override
543 public String toString() {
544 if (pt != null) {
545 return pt.toString();
546 } else {
547 return "";
548 }
549 }
550 }
551
552 class MethodAttrInfo extends ResultInfo {
553 public MethodAttrInfo() {
554 this(chk.basicHandler);
555 }
556
557 public MethodAttrInfo(CheckContext checkContext) {
558 super(KindSelector.VAL, Infer.anyPoly, checkContext);
559 }
560
561 @Override
562 protected boolean needsArgumentAttr(JCTree tree) {
563 return true;
564 }
565
566 protected ResultInfo dup(Type newPt) {
567 throw new IllegalStateException();
568 }
569
570 protected ResultInfo dup(CheckContext newContext) {
571 return new MethodAttrInfo(newContext);
572 }
573
574 protected ResultInfo dup(Type newPt, CheckContext newContext) {
575 throw new IllegalStateException();
576 }
577
578 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
579 throw new IllegalStateException();
580 }
581
582 protected ResultInfo dup(CheckMode newMode) {
583 throw new IllegalStateException();
584 }
585 }
586
587 class RecoveryInfo extends ResultInfo {
588
589 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
590 this(deferredAttrContext, Type.recoveryType);
591 }
592
593 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
594 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
595 @Override
596 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
597 return deferredAttrContext;
598 }
599 @Override
600 public boolean compatible(Type found, Type req, Warner warn) {
601 return true;
602 }
603 @Override
604 public void report(DiagnosticPosition pos, JCDiagnostic details) {
605 if (pt == Type.recoveryType) {
606 chk.basicHandler.report(pos, details);
607 }
608 }
609 });
610 }
611 }
612
613 final ResultInfo statInfo;
614 final ResultInfo varAssignmentInfo;
615 final ResultInfo methodAttrInfo;
616 final ResultInfo unknownExprInfo;
617 final ResultInfo unknownTypeInfo;
618 final ResultInfo unknownTypeExprInfo;
619 final ResultInfo recoveryInfo;
620
621 Type pt() {
622 return resultInfo.pt;
623 }
624
625 KindSelector pkind() {
626 return resultInfo.pkind;
627 }
628
629 /* ************************************************************************
630 * Visitor methods
631 *************************************************************************/
632
633 /** Visitor argument: the current environment.
634 */
635 Env<AttrContext> env;
636
637 /** Visitor argument: the currently expected attribution result.
638 */
639 ResultInfo resultInfo;
640
641 /** Visitor result: the computed type.
642 */
643 Type result;
644
645 /** Visitor method: attribute a tree, catching any completion failure
646 * exceptions. Return the tree's type.
647 *
648 * @param tree The tree to be visited.
649 * @param env The environment visitor argument.
650 * @param resultInfo The result info visitor argument.
651 */
652 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
653 Env<AttrContext> prevEnv = this.env;
654 ResultInfo prevResult = this.resultInfo;
655 try {
656 this.env = env;
657 this.resultInfo = resultInfo;
658 if (resultInfo.needsArgumentAttr(tree)) {
659 result = argumentAttr.attribArg(tree, env);
660 } else {
661 tree.accept(this);
662 }
663 if (tree == breakTree &&
664 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
665 breakTreeFound(copyEnv(env));
666 }
667 return result;
668 } catch (CompletionFailure ex) {
669 tree.type = syms.errType;
670 return chk.completionError(tree.pos(), ex);
671 } finally {
672 this.env = prevEnv;
673 this.resultInfo = prevResult;
674 }
675 }
676
677 protected void breakTreeFound(Env<AttrContext> env) {
678 throw new BreakAttr(env);
679 }
680
681 Env<AttrContext> copyEnv(Env<AttrContext> env) {
682 Env<AttrContext> newEnv =
683 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
684 if (newEnv.outer != null) {
685 newEnv.outer = copyEnv(newEnv.outer);
686 }
687 return newEnv;
688 }
689
690 WriteableScope copyScope(WriteableScope sc) {
691 WriteableScope newScope = WriteableScope.create(sc.owner);
692 List<Symbol> elemsList = List.nil();
693 for (Symbol sym : sc.getSymbols()) {
694 elemsList = elemsList.prepend(sym);
695 }
696 for (Symbol s : elemsList) {
697 newScope.enter(s);
698 }
699 return newScope;
700 }
701
702 /** Derived visitor method: attribute an expression tree.
703 */
704 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
705 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
706 }
707
708 /** Derived visitor method: attribute an expression tree with
709 * no constraints on the computed type.
710 */
711 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
712 return attribTree(tree, env, unknownExprInfo);
713 }
714
715 /** Derived visitor method: attribute a type tree.
716 */
717 public Type attribType(JCTree tree, Env<AttrContext> env) {
718 Type result = attribType(tree, env, Type.noType);
719 return result;
720 }
721
722 /** Derived visitor method: attribute a type tree.
723 */
724 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
725 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
726 return result;
727 }
728
729 /** Derived visitor method: attribute a statement or definition tree.
730 */
731 public Type attribStat(JCTree tree, Env<AttrContext> env) {
732 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
733 Type result = attribTree(tree, env, statInfo);
734 analyzer.analyzeIfNeeded(tree, analyzeEnv);
735 return result;
736 }
737
738 /** Attribute a list of expressions, returning a list of types.
739 */
740 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
741 ListBuffer<Type> ts = new ListBuffer<>();
742 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
743 ts.append(attribExpr(l.head, env, pt));
744 return ts.toList();
745 }
746
747 /** Attribute a list of statements, returning nothing.
748 */
749 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
750 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
751 attribStat(l.head, env);
752 }
753
754 /** Attribute the arguments in a method call, returning the method kind.
755 */
756 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
757 KindSelector kind = initialKind;
758 for (JCExpression arg : trees) {
759 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
760 if (argtype.hasTag(DEFERRED)) {
761 kind = KindSelector.of(KindSelector.POLY, kind);
762 }
763 argtypes.append(argtype);
764 }
765 return kind;
766 }
767
768 /** Attribute a type argument list, returning a list of types.
769 * Caller is responsible for calling checkRefTypes.
770 */
771 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
772 ListBuffer<Type> argtypes = new ListBuffer<>();
773 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
774 argtypes.append(attribType(l.head, env));
775 return argtypes.toList();
776 }
777
778 /** Attribute a type argument list, returning a list of types.
779 * Check that all the types are references.
780 */
781 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
782 List<Type> types = attribAnyTypes(trees, env);
783 return chk.checkRefTypes(trees, types);
784 }
785
786 /**
787 * Attribute type variables (of generic classes or methods).
788 * Compound types are attributed later in attribBounds.
789 * @param typarams the type variables to enter
790 * @param env the current environment
791 */
792 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
793 for (JCTypeParameter tvar : typarams) {
794 TypeVar a = (TypeVar)tvar.type;
795 a.tsym.flags_field |= UNATTRIBUTED;
796 a.setUpperBound(Type.noType);
797 if (!tvar.bounds.isEmpty()) {
798 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
799 for (JCExpression bound : tvar.bounds.tail)
800 bounds = bounds.prepend(attribType(bound, env));
801 types.setBounds(a, bounds.reverse());
802 } else {
803 // if no bounds are given, assume a single bound of
804 // java.lang.Object.
805 types.setBounds(a, List.of(syms.objectType));
806 }
807 a.tsym.flags_field &= ~UNATTRIBUTED;
808 }
809 if (checkCyclic) {
810 for (JCTypeParameter tvar : typarams) {
811 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
812 }
813 }
814 }
815
816 /**
817 * Attribute the type references in a list of annotations.
818 */
819 void attribAnnotationTypes(List<JCAnnotation> annotations,
820 Env<AttrContext> env) {
821 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
822 JCAnnotation a = al.head;
823 attribType(a.annotationType, env);
824 }
825 }
826
827 /**
828 * Attribute a "lazy constant value".
829 * @param env The env for the const value
830 * @param variable The initializer for the const value
831 * @param type The expected type, or null
832 * @see VarSymbol#setLazyConstValue
833 */
834 public Object attribLazyConstantValue(Env<AttrContext> env,
835 JCVariableDecl variable,
836 Type type) {
837
838 DiagnosticPosition prevLintPos
839 = deferredLintHandler.setPos(variable.pos());
840
841 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
842 try {
843 Type itype = attribExpr(variable.init, env, type);
844 if (variable.isImplicitlyTyped()) {
845 //fixup local variable type
846 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
847 }
848 if (itype.constValue() != null) {
849 return coerce(itype, type).constValue();
850 } else {
851 return null;
852 }
853 } finally {
854 log.useSource(prevSource);
855 deferredLintHandler.setPos(prevLintPos);
856 }
857 }
858
859 /** Attribute type reference in an `extends' or `implements' clause.
860 * Supertypes of anonymous inner classes are usually already attributed.
861 *
862 * @param tree The tree making up the type reference.
863 * @param env The environment current at the reference.
864 * @param classExpected true if only a class is expected here.
865 * @param interfaceExpected true if only an interface is expected here.
866 */
867 Type attribBase(JCTree tree,
868 Env<AttrContext> env,
869 boolean classExpected,
870 boolean interfaceExpected,
871 boolean checkExtensible) {
872 Type t = tree.type != null ?
873 tree.type :
874 attribType(tree, env);
875 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
876 }
877 Type checkBase(Type t,
878 JCTree tree,
879 Env<AttrContext> env,
880 boolean classExpected,
881 boolean interfaceExpected,
882 boolean checkExtensible) {
883 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
884 (((JCTypeApply) tree).clazz).pos() : tree.pos();
885 if (t.tsym.isAnonymous()) {
886 log.error(pos, Errors.CantInheritFromAnon);
887 return types.createErrorType(t);
888 }
889 if (t.isErroneous())
890 return t;
891 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
892 // check that type variable is already visible
893 if (t.getUpperBound() == null) {
894 log.error(pos, Errors.IllegalForwardRef);
895 return types.createErrorType(t);
896 }
897 } else {
898 t = chk.checkClassType(pos, t, checkExtensible);
899 }
900 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
901 log.error(pos, Errors.IntfExpectedHere);
902 // return errType is necessary since otherwise there might
903 // be undetected cycles which cause attribution to loop
904 return types.createErrorType(t);
905 } else if (checkExtensible &&
906 classExpected &&
907 (t.tsym.flags() & INTERFACE) != 0) {
908 log.error(pos, Errors.NoIntfExpectedHere);
909 return types.createErrorType(t);
910 }
911 if (checkExtensible &&
912 ((t.tsym.flags() & FINAL) != 0)) {
913 log.error(pos,
914 Errors.CantInheritFromFinal(t.tsym));
915 }
916 chk.checkNonCyclic(pos, t);
917 return t;
918 }
919
920 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
921 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
922 id.type = env.info.scope.owner.enclClass().type;
923 id.sym = env.info.scope.owner.enclClass();
924 return id.type;
925 }
926
927 public void visitClassDef(JCClassDecl tree) {
928 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
929 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
930 argumentAttr.withLocalCacheContext() : null);
931 try {
932 // Local and anonymous classes have not been entered yet, so we need to
933 // do it now.
934 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
935 enter.classEnter(tree, env);
936 } else {
937 // If this class declaration is part of a class level annotation,
938 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
939 // order to simplify later steps and allow for sensible error
940 // messages.
941 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
942 enter.classEnter(tree, env);
943 }
944
945 ClassSymbol c = tree.sym;
946 if (c == null) {
947 // exit in case something drastic went wrong during enter.
948 result = null;
949 } else {
950 // make sure class has been completed:
951 c.complete();
952
953 // If this class appears as an anonymous class
954 // in a superclass constructor call
955 // disable implicit outer instance from being passed.
956 // (This would be an illegal access to "this before super").
957 if (env.info.isSelfCall &&
958 env.tree.hasTag(NEWCLASS)) {
959 c.flags_field |= NOOUTERTHIS;
960 }
961 attribClass(tree.pos(), c);
962 result = tree.type = c.type;
963 }
964 } finally {
965 localCacheContext.ifPresent(LocalCacheContext::leave);
966 }
967 }
968
969 public void visitMethodDef(JCMethodDecl tree) {
970 MethodSymbol m = tree.sym;
971 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
972
973 Lint lint = env.info.lint.augment(m);
974 Lint prevLint = chk.setLint(lint);
975 MethodSymbol prevMethod = chk.setMethod(m);
976 try {
977 deferredLintHandler.flush(tree.pos());
978 chk.checkDeprecatedAnnotation(tree.pos(), m);
979
980
981 // Create a new environment with local scope
982 // for attributing the method.
983 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
984 localEnv.info.lint = lint;
985
986 attribStats(tree.typarams, localEnv);
987
988 // If we override any other methods, check that we do so properly.
989 // JLS ???
990 if (m.isStatic()) {
991 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
992 } else {
993 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
994 }
995 chk.checkOverride(env, tree, m);
996
997 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
998 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
999 }
1000
1001 // Enter all type parameters into the local method scope.
1002 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1003 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1004
1005 ClassSymbol owner = env.enclClass.sym;
1006 if ((owner.flags() & ANNOTATION) != 0 &&
1007 (tree.params.nonEmpty() ||
1008 tree.recvparam != null))
1009 log.error(tree.params.nonEmpty() ?
1010 tree.params.head.pos() :
1011 tree.recvparam.pos(),
1012 Errors.IntfAnnotationMembersCantHaveParams);
1013
1014 // Attribute all value parameters.
1015 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1016 attribStat(l.head, localEnv);
1017 }
1018
1019 chk.checkVarargsMethodDecl(localEnv, tree);
1020
1021 // Check that type parameters are well-formed.
1022 chk.validate(tree.typarams, localEnv);
1023
1024 // Check that result type is well-formed.
1025 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1026 chk.validate(tree.restype, localEnv);
1027
1028 // Check that receiver type is well-formed.
1029 if (tree.recvparam != null) {
1030 // Use a new environment to check the receiver parameter.
1031 // Otherwise I get "might not have been initialized" errors.
1032 // Is there a better way?
1033 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1034 attribType(tree.recvparam, newEnv);
1035 chk.validate(tree.recvparam, newEnv);
1036 }
1037
1038 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1039 // lets find if this method is an accessor
1040 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1041 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1042 if (recordComponent.isPresent()) {
1043 // the method is a user defined accessor lets check that everything is fine
1044 if (!tree.sym.isPublic()) {
1045 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1046 }
1047 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1048 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1049 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1050 }
1051 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1052 log.error(tree,
1053 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1054 }
1055 if (!tree.typarams.isEmpty()) {
1056 log.error(tree,
1057 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1058 }
1059 if (tree.sym.isStatic()) {
1060 log.error(tree,
1061 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1062 }
1063 }
1064
1065 if (tree.name == names.init) {
1066 // if this a constructor other than the canonical one
1067 if ((tree.sym.flags_field & RECORD) == 0) {
1068 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1069 if (app == null ||
1070 TreeInfo.name(app.meth) != names._this ||
1071 !checkFirstConstructorStat(app, tree, false)) {
1072 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor);
1073 }
1074 } else {
1075 // but if it is the canonical:
1076
1077 // if user generated, then it shouldn't explicitly invoke any other constructor
1078 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1079 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1080 if (app != null &&
1081 (TreeInfo.name(app.meth) == names._this ||
1082 TreeInfo.name(app.meth) == names._super) &&
1083 checkFirstConstructorStat(app, tree, false)) {
1084 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1085 Fragments.Canonical, tree.sym,
1086 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1087 }
1088 }
1089
1090 // also we want to check that no type variables have been defined
1091 if (!tree.typarams.isEmpty()) {
1092 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1093 Fragments.Canonical, tree.sym, Fragments.CanonicalMustNotDeclareTypeVariables));
1094 }
1095
1096 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1097 * record components
1098 */
1099 List<Type> recordComponentTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1100 for (JCVariableDecl param: tree.params) {
1101 if (!types.isSameType(param.type, recordComponentTypes.head)) {
1102 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1103 Fragments.Canonical, tree.sym, Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1104 }
1105 recordComponentTypes = recordComponentTypes.tail;
1106 }
1107 }
1108 }
1109 }
1110
1111 // annotation method checks
1112 if ((owner.flags() & ANNOTATION) != 0) {
1113 // annotation method cannot have throws clause
1114 if (tree.thrown.nonEmpty()) {
1115 log.error(tree.thrown.head.pos(),
1116 Errors.ThrowsNotAllowedInIntfAnnotation);
1117 }
1118 // annotation method cannot declare type-parameters
1119 if (tree.typarams.nonEmpty()) {
1120 log.error(tree.typarams.head.pos(),
1121 Errors.IntfAnnotationMembersCantHaveTypeParams);
1122 }
1123 // validate annotation method's return type (could be an annotation type)
1124 chk.validateAnnotationType(tree.restype);
1125 // ensure that annotation method does not clash with members of Object/Annotation
1126 chk.validateAnnotationMethod(tree.pos(), m);
1127 }
1128
1129 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1130 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1131
1132 if (tree.body == null) {
1133 // Empty bodies are only allowed for
1134 // abstract, native, or interface methods, or for methods
1135 // in a retrofit signature class.
1136 if (tree.defaultValue != null) {
1137 if ((owner.flags() & ANNOTATION) == 0)
1138 log.error(tree.pos(),
1139 Errors.DefaultAllowedInIntfAnnotationMember);
1140 }
1141 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1142 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1143 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1144 if ((owner.flags() & INTERFACE) != 0) {
1145 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1146 } else {
1147 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1148 }
1149 } else if ((tree.mods.flags & NATIVE) != 0) {
1150 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1151 } else {
1152 // Add an implicit super() call unless an explicit call to
1153 // super(...) or this(...) is given
1154 // or we are compiling class java.lang.Object.
1155 if (tree.name == names.init && owner.type != syms.objectType) {
1156 JCBlock body = tree.body;
1157 if (body.stats.isEmpty() ||
1158 TreeInfo.getConstructorInvocationName(body.stats, names) == names.empty) {
1159 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1160 make.Ident(names._super), make.Idents(List.nil())));
1161 body.stats = body.stats.prepend(supCall);
1162 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1163 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1164 TreeInfo.isSuperCall(body.stats.head)) {
1165 // enum constructors are not allowed to call super
1166 // directly, so make sure there aren't any super calls
1167 // in enum constructors, except in the compiler
1168 // generated one.
1169 log.error(tree.body.stats.head.pos(),
1170 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1171 }
1172 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1173 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1174 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1175 if (!initParamNames.equals(recordComponentNames)) {
1176 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1177 Fragments.Canonical, env.enclClass.sym, Fragments.CanonicalWithNameMismatch));
1178 }
1179 if (!tree.sym.isPublic()) {
1180 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1181 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1182 env.enclClass.sym, Fragments.CanonicalConstructorMustBePublic));
1183 }
1184 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1185 log.error(tree,
1186 Errors.InvalidCanonicalConstructorInRecord(
1187 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1188 env.enclClass.sym, Fragments.ThrowsClauseNotAllowedForCanonicalConstructor));
1189 }
1190 }
1191 }
1192
1193 // Attribute all type annotations in the body
1194 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1195 annotate.flush();
1196
1197 // Attribute method body.
1198 attribStat(tree.body, localEnv);
1199 }
1200
1201 localEnv.info.scope.leave();
1202 result = tree.type = m.type;
1203 } finally {
1204 chk.setLint(prevLint);
1205 chk.setMethod(prevMethod);
1206 }
1207 }
1208
1209 public void visitVarDef(JCVariableDecl tree) {
1210 // Local variables have not been entered yet, so we need to do it now:
1211 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1212 if (tree.sym != null) {
1213 // parameters have already been entered
1214 env.info.scope.enter(tree.sym);
1215 } else {
1216 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1217 if (tree.init == null) {
1218 //cannot use 'var' without initializer
1219 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1220 tree.vartype = make.Erroneous();
1221 } else {
1222 Fragment msg = canInferLocalVarType(tree);
1223 if (msg != null) {
1224 //cannot use 'var' with initializer which require an explicit target
1225 //(e.g. lambda, method reference, array initializer).
1226 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1227 tree.vartype = make.Erroneous();
1228 }
1229 }
1230 }
1231 try {
1232 annotate.blockAnnotations();
1233 memberEnter.memberEnter(tree, env);
1234 } finally {
1235 annotate.unblockAnnotations();
1236 }
1237 }
1238 } else {
1239 if (tree.init != null) {
1240 // Field initializer expression need to be entered.
1241 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1242 annotate.flush();
1243 }
1244 }
1245
1246 VarSymbol v = tree.sym;
1247 Lint lint = env.info.lint.augment(v);
1248 Lint prevLint = chk.setLint(lint);
1249
1250 // Check that the variable's declared type is well-formed.
1251 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1252 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1253 (tree.sym.flags() & PARAMETER) != 0;
1254 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1255
1256 try {
1257 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1258 deferredLintHandler.flush(tree.pos());
1259 chk.checkDeprecatedAnnotation(tree.pos(), v);
1260
1261 if (tree.init != null) {
1262 if ((v.flags_field & FINAL) == 0 ||
1263 !memberEnter.needsLazyConstValue(tree.init)) {
1264 // Not a compile-time constant
1265 // Attribute initializer in a new environment
1266 // with the declared variable as owner.
1267 // Check that initializer conforms to variable's declared type.
1268 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1269 initEnv.info.lint = lint;
1270 // In order to catch self-references, we set the variable's
1271 // declaration position to maximal possible value, effectively
1272 // marking the variable as undefined.
1273 initEnv.info.enclVar = v;
1274 attribExpr(tree.init, initEnv, v.type);
1275 if (tree.isImplicitlyTyped()) {
1276 //fixup local variable type
1277 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1278 }
1279 }
1280 if (tree.isImplicitlyTyped()) {
1281 setSyntheticVariableType(tree, v.type);
1282 }
1283 }
1284 result = tree.type = v.type;
1285 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1286 if (isNonArgsMethodInObject(v.name)) {
1287 log.error(tree, Errors.IllegalRecordComponentName(v));
1288 }
1289 }
1290 }
1291 finally {
1292 chk.setLint(prevLint);
1293 }
1294 }
1295
1296 private boolean isNonArgsMethodInObject(Name name) {
1297 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1298 if (s.type.getParameterTypes().isEmpty()) {
1299 return true;
1300 }
1301 }
1302 return false;
1303 }
1304
1305 Fragment canInferLocalVarType(JCVariableDecl tree) {
1306 LocalInitScanner lis = new LocalInitScanner();
1307 lis.scan(tree.init);
1308 return lis.badInferenceMsg;
1309 }
1310
1311 static class LocalInitScanner extends TreeScanner {
1312 Fragment badInferenceMsg = null;
1313 boolean needsTarget = true;
1314
1315 @Override
1316 public void visitNewArray(JCNewArray tree) {
1317 if (tree.elemtype == null && needsTarget) {
1318 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1319 }
1320 }
1321
1322 @Override
1323 public void visitLambda(JCLambda tree) {
1324 if (needsTarget) {
1325 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1326 }
1327 }
1328
1329 @Override
1330 public void visitTypeCast(JCTypeCast tree) {
1331 boolean prevNeedsTarget = needsTarget;
1332 try {
1333 needsTarget = false;
1334 super.visitTypeCast(tree);
1335 } finally {
1336 needsTarget = prevNeedsTarget;
1337 }
1338 }
1339
1340 @Override
1341 public void visitReference(JCMemberReference tree) {
1342 if (needsTarget) {
1343 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1344 }
1345 }
1346
1347 @Override
1348 public void visitNewClass(JCNewClass tree) {
1349 boolean prevNeedsTarget = needsTarget;
1350 try {
1351 needsTarget = false;
1352 super.visitNewClass(tree);
1353 } finally {
1354 needsTarget = prevNeedsTarget;
1355 }
1356 }
1357
1358 @Override
1359 public void visitApply(JCMethodInvocation tree) {
1360 boolean prevNeedsTarget = needsTarget;
1361 try {
1362 needsTarget = false;
1363 super.visitApply(tree);
1364 } finally {
1365 needsTarget = prevNeedsTarget;
1366 }
1367 }
1368 }
1369
1370 public void visitSkip(JCSkip tree) {
1371 result = null;
1372 }
1373
1374 public void visitBlock(JCBlock tree) {
1375 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1376 // Block is a static or instance initializer;
1377 // let the owner of the environment be a freshly
1378 // created BLOCK-method.
1379 Symbol fakeOwner =
1380 new MethodSymbol(tree.flags | BLOCK |
1381 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1382 env.info.scope.owner);
1383 final Env<AttrContext> localEnv =
1384 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1385
1386 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1387 // Attribute all type annotations in the block
1388 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1389 annotate.flush();
1390 attribStats(tree.stats, localEnv);
1391
1392 {
1393 // Store init and clinit type annotations with the ClassSymbol
1394 // to allow output in Gen.normalizeDefs.
1395 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1396 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1397 if ((tree.flags & STATIC) != 0) {
1398 cs.appendClassInitTypeAttributes(tas);
1399 } else {
1400 cs.appendInitTypeAttributes(tas);
1401 }
1402 }
1403 } else {
1404 // Create a new local environment with a local scope.
1405 Env<AttrContext> localEnv =
1406 env.dup(tree, env.info.dup(env.info.scope.dup()));
1407 try {
1408 attribStats(tree.stats, localEnv);
1409 } finally {
1410 localEnv.info.scope.leave();
1411 }
1412 }
1413 result = null;
1414 }
1415
1416 public void visitDoLoop(JCDoWhileLoop tree) {
1417 attribStat(tree.body, env.dup(tree));
1418 attribExpr(tree.cond, env, syms.booleanType);
1419 if (!breaksOutOf(tree, tree.body)) {
1420 //include condition's body when false after the while, if cannot get out of the loop
1421 List<BindingSymbol> bindings = matchBindingsComputer.getMatchBindings(tree.cond, false);
1422
1423 bindings.forEach(env.info.scope::enter);
1424 bindings.forEach(BindingSymbol::preserveBinding);
1425 }
1426 result = null;
1427 }
1428
1429 public void visitWhileLoop(JCWhileLoop tree) {
1430 attribExpr(tree.cond, env, syms.booleanType);
1431 // include condition's bindings when true in the body:
1432 Env<AttrContext> whileEnv = bindingEnv(env, matchBindingsComputer.getMatchBindings(tree.cond, true));
1433 try {
1434 attribStat(tree.body, whileEnv.dup(tree));
1435 } finally {
1436 whileEnv.info.scope.leave();
1437 }
1438 if (!breaksOutOf(tree, tree.body)) {
1439 //include condition's bindings when false after the while, if cannot get out of the loop
1440 List<BindingSymbol> bindings =
1441 matchBindingsComputer.getMatchBindings(tree.cond, false);
1442
1443 bindings.forEach(env.info.scope::enter);
1444 bindings.forEach(BindingSymbol::preserveBinding);
1445 }
1446 result = null;
1447 }
1448
1449 private boolean breaksOutOf(JCTree loop, JCTree body) {
1450 preFlow(body);
1451 return flow.breaksOutOf(env, loop, body, make);
1452 }
1453
1454 public void visitForLoop(JCForLoop tree) {
1455 Env<AttrContext> loopEnv =
1456 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1457 try {
1458 attribStats(tree.init, loopEnv);
1459 List<BindingSymbol> matchBindings = List.nil();
1460 if (tree.cond != null) {
1461 attribExpr(tree.cond, loopEnv, syms.booleanType);
1462 // include condition's bindings when true in the body and step:
1463 matchBindings = matchBindingsComputer.getMatchBindings(tree.cond, true);
1464 }
1465 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, matchBindings);
1466 try {
1467 bodyEnv.tree = tree; // before, we were not in loop!
1468 attribStats(tree.step, bodyEnv);
1469 attribStat(tree.body, bodyEnv);
1470 } finally {
1471 bodyEnv.info.scope.leave();
1472 }
1473 result = null;
1474 }
1475 finally {
1476 loopEnv.info.scope.leave();
1477 }
1478 if (!breaksOutOf(tree, tree.body)) {
1479 //include condition's body when false after the while, if cannot get out of the loop
1480 List<BindingSymbol> bindings =
1481 matchBindingsComputer.getMatchBindings(tree.cond, false);
1482
1483 bindings.forEach(env.info.scope::enter);
1484 bindings.forEach(BindingSymbol::preserveBinding);
1485 }
1486 }
1487
1488 public void visitForeachLoop(JCEnhancedForLoop tree) {
1489 Env<AttrContext> loopEnv =
1490 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1491 try {
1492 //the Formal Parameter of a for-each loop is not in the scope when
1493 //attributing the for-each expression; we mimick this by attributing
1494 //the for-each expression first (against original scope).
1495 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1496 chk.checkNonVoid(tree.pos(), exprType);
1497 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1498 if (elemtype == null) {
1499 // or perhaps expr implements Iterable<T>?
1500 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1501 if (base == null) {
1502 log.error(tree.expr.pos(),
1503 Errors.ForeachNotApplicableToType(exprType,
1504 Fragments.TypeReqArrayOrIterable));
1505 elemtype = types.createErrorType(exprType);
1506 } else {
1507 List<Type> iterableParams = base.allparams();
1508 elemtype = iterableParams.isEmpty()
1509 ? syms.objectType
1510 : types.wildUpperBound(iterableParams.head);
1511 }
1512 }
1513 if (tree.var.isImplicitlyTyped()) {
1514 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1515 setSyntheticVariableType(tree.var, inferredType);
1516 }
1517 attribStat(tree.var, loopEnv);
1518 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1519 loopEnv.tree = tree; // before, we were not in loop!
1520 attribStat(tree.body, loopEnv);
1521 result = null;
1522 }
1523 finally {
1524 loopEnv.info.scope.leave();
1525 }
1526 }
1527
1528 public void visitLabelled(JCLabeledStatement tree) {
1529 // Check that label is not used in an enclosing statement
1530 Env<AttrContext> env1 = env;
1531 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1532 if (env1.tree.hasTag(LABELLED) &&
1533 ((JCLabeledStatement) env1.tree).label == tree.label) {
1534 log.error(tree.pos(),
1535 Errors.LabelAlreadyInUse(tree.label));
1536 break;
1537 }
1538 env1 = env1.next;
1539 }
1540
1541 attribStat(tree.body, env.dup(tree));
1542 result = null;
1543 }
1544
1545 public void visitSwitch(JCSwitch tree) {
1546 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1547 attribStats(c.stats, caseEnv);
1548 });
1549 result = null;
1550 }
1551
1552 public void visitSwitchExpression(JCSwitchExpression tree) {
1553 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1554 PolyKind.STANDALONE : PolyKind.POLY;
1555
1556 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1557 //this means we are returning a poly conditional from void-compatible lambda expression
1558 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1559 result = tree.type = types.createErrorType(resultInfo.pt);
1560 return;
1561 }
1562
1563 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1564 unknownExprInfo :
1565 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1566
1567 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1568 ListBuffer<Type> caseTypes = new ListBuffer<>();
1569
1570 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1571 caseEnv.info.yieldResult = condInfo;
1572 attribStats(c.stats, caseEnv);
1573 new TreeScanner() {
1574 @Override
1575 public void visitYield(JCYield brk) {
1576 if (brk.target == tree) {
1577 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1578 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1579 }
1580 super.visitYield(brk);
1581 }
1582
1583 @Override public void visitClassDef(JCClassDecl tree) {}
1584 @Override public void visitLambda(JCLambda tree) {}
1585 }.scan(c.stats);
1586 });
1587
1588 if (tree.cases.isEmpty()) {
1589 log.error(tree.pos(),
1590 Errors.SwitchExpressionEmpty);
1591 } else if (caseTypes.isEmpty()) {
1592 log.error(tree.pos(),
1593 Errors.SwitchExpressionNoResultExpressions);
1594 }
1595
1596 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1597
1598 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1599 }
1600 //where:
1601 CheckContext switchExpressionContext(CheckContext checkContext) {
1602 return new Check.NestedCheckContext(checkContext) {
1603 //this will use enclosing check context to check compatibility of
1604 //subexpression against target type; if we are in a method check context,
1605 //depending on whether boxing is allowed, we could have incompatibilities
1606 @Override
1607 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1608 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1609 }
1610 };
1611 }
1612
1613 private void handleSwitch(JCTree switchTree,
1614 JCExpression selector,
1615 List<JCCase> cases,
1616 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1617 Type seltype = attribExpr(selector, env);
1618
1619 Env<AttrContext> switchEnv =
1620 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1621
1622 try {
1623 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1624 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1625 if (!enumSwitch && !stringSwitch)
1626 seltype = chk.checkType(selector.pos(), seltype, syms.intType);
1627
1628 // Attribute all cases and
1629 // check that there are no duplicate case labels or default clauses.
1630 Set<Object> labels = new HashSet<>(); // The set of case labels.
1631 boolean hasDefault = false; // Is there a default label?
1632 CaseTree.CaseKind caseKind = null;
1633 boolean wasError = false;
1634 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1635 JCCase c = l.head;
1636 if (caseKind == null) {
1637 caseKind = c.caseKind;
1638 } else if (caseKind != c.caseKind && !wasError) {
1639 log.error(c.pos(),
1640 Errors.SwitchMixingCaseTypes);
1641 wasError = true;
1642 }
1643 if (c.getExpressions().nonEmpty()) {
1644 for (JCExpression pat : c.getExpressions()) {
1645 if (TreeInfo.isNull(pat)) {
1646 log.error(pat.pos(),
1647 Errors.SwitchNullNotAllowed);
1648 } else if (enumSwitch) {
1649 Symbol sym = enumConstant(pat, seltype);
1650 if (sym == null) {
1651 log.error(pat.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1652 } else if (!labels.add(sym)) {
1653 log.error(c.pos(), Errors.DuplicateCaseLabel);
1654 }
1655 } else {
1656 Type pattype = attribExpr(pat, switchEnv, seltype);
1657 if (!pattype.hasTag(ERROR)) {
1658 if (pattype.constValue() == null) {
1659 log.error(pat.pos(),
1660 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1661 } else if (!labels.add(pattype.constValue())) {
1662 log.error(c.pos(), Errors.DuplicateCaseLabel);
1663 }
1664 }
1665 }
1666 }
1667 } else if (hasDefault) {
1668 log.error(c.pos(), Errors.DuplicateDefaultLabel);
1669 } else {
1670 hasDefault = true;
1671 }
1672 Env<AttrContext> caseEnv =
1673 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1674 try {
1675 attribCase.accept(c, caseEnv);
1676 } finally {
1677 caseEnv.info.scope.leave();
1678 }
1679 addVars(c.stats, switchEnv.info.scope);
1680 }
1681 } finally {
1682 switchEnv.info.scope.leave();
1683 }
1684 }
1685 // where
1686 /** Add any variables defined in stats to the switch scope. */
1687 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1688 for (;stats.nonEmpty(); stats = stats.tail) {
1689 JCTree stat = stats.head;
1690 if (stat.hasTag(VARDEF))
1691 switchScope.enter(((JCVariableDecl) stat).sym);
1692 }
1693 }
1694 // where
1695 /** Return the selected enumeration constant symbol, or null. */
1696 private Symbol enumConstant(JCTree tree, Type enumType) {
1697 if (tree.hasTag(IDENT)) {
1698 JCIdent ident = (JCIdent)tree;
1699 Name name = ident.name;
1700 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1701 if (sym.kind == VAR) {
1702 Symbol s = ident.sym = sym;
1703 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1704 ident.type = s.type;
1705 return ((s.flags_field & Flags.ENUM) == 0)
1706 ? null : s;
1707 }
1708 }
1709 }
1710 return null;
1711 }
1712
1713 public void visitSynchronized(JCSynchronized tree) {
1714 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1715 attribStat(tree.body, env);
1716 result = null;
1717 }
1718
1719 public void visitTry(JCTry tree) {
1720 // Create a new local environment with a local
1721 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1722 try {
1723 boolean isTryWithResource = tree.resources.nonEmpty();
1724 // Create a nested environment for attributing the try block if needed
1725 Env<AttrContext> tryEnv = isTryWithResource ?
1726 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1727 localEnv;
1728 try {
1729 // Attribute resource declarations
1730 for (JCTree resource : tree.resources) {
1731 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1732 @Override
1733 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1734 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1735 }
1736 };
1737 ResultInfo twrResult =
1738 new ResultInfo(KindSelector.VAR,
1739 syms.autoCloseableType,
1740 twrContext);
1741 if (resource.hasTag(VARDEF)) {
1742 attribStat(resource, tryEnv);
1743 twrResult.check(resource, resource.type);
1744
1745 //check that resource type cannot throw InterruptedException
1746 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1747
1748 VarSymbol var = ((JCVariableDecl) resource).sym;
1749 var.setData(ElementKind.RESOURCE_VARIABLE);
1750 } else {
1751 attribTree(resource, tryEnv, twrResult);
1752 }
1753 }
1754 // Attribute body
1755 attribStat(tree.body, tryEnv);
1756 } finally {
1757 if (isTryWithResource)
1758 tryEnv.info.scope.leave();
1759 }
1760
1761 // Attribute catch clauses
1762 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1763 JCCatch c = l.head;
1764 Env<AttrContext> catchEnv =
1765 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1766 try {
1767 Type ctype = attribStat(c.param, catchEnv);
1768 if (TreeInfo.isMultiCatch(c)) {
1769 //multi-catch parameter is implicitly marked as final
1770 c.param.sym.flags_field |= FINAL | UNION;
1771 }
1772 if (c.param.sym.kind == VAR) {
1773 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1774 }
1775 chk.checkType(c.param.vartype.pos(),
1776 chk.checkClassType(c.param.vartype.pos(), ctype),
1777 syms.throwableType);
1778 attribStat(c.body, catchEnv);
1779 } finally {
1780 catchEnv.info.scope.leave();
1781 }
1782 }
1783
1784 // Attribute finalizer
1785 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1786 result = null;
1787 }
1788 finally {
1789 localEnv.info.scope.leave();
1790 }
1791 }
1792
1793 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1794 if (!resource.isErroneous() &&
1795 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1796 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1797 Symbol close = syms.noSymbol;
1798 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1799 try {
1800 close = rs.resolveQualifiedMethod(pos,
1801 env,
1802 types.skipTypeVars(resource, false),
1803 names.close,
1804 List.nil(),
1805 List.nil());
1806 }
1807 finally {
1808 log.popDiagnosticHandler(discardHandler);
1809 }
1810 if (close.kind == MTH &&
1811 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1812 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1813 env.info.lint.isEnabled(LintCategory.TRY)) {
1814 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1815 }
1816 }
1817 }
1818
1819 public void visitConditional(JCConditional tree) {
1820 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1821
1822 tree.polyKind = (!allowPoly ||
1823 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
1824 isBooleanOrNumeric(env, tree)) ?
1825 PolyKind.STANDALONE : PolyKind.POLY;
1826
1827 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1828 //this means we are returning a poly conditional from void-compatible lambda expression
1829 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
1830 result = tree.type = types.createErrorType(resultInfo.pt);
1831 return;
1832 }
1833
1834 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1835 unknownExprInfo :
1836 resultInfo.dup(conditionalContext(resultInfo.checkContext));
1837
1838
1839 // x ? y : z
1840 // include x's bindings when true in y
1841 // include x's bindings when false in z
1842
1843 Type truetype;
1844 Env<AttrContext> trueEnv = bindingEnv(env, matchBindingsComputer.getMatchBindings(tree.cond, true));
1845 try {
1846 truetype = attribTree(tree.truepart, trueEnv, condInfo);
1847 } finally {
1848 trueEnv.info.scope.leave();
1849 }
1850
1851 Type falsetype;
1852 Env<AttrContext> falseEnv = bindingEnv(env, matchBindingsComputer.getMatchBindings(tree.cond, false));
1853 try {
1854 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
1855 } finally {
1856 falseEnv.info.scope.leave();
1857 }
1858
1859 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
1860 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
1861 List.of(truetype, falsetype)) : pt();
1862 if (condtype.constValue() != null &&
1863 truetype.constValue() != null &&
1864 falsetype.constValue() != null &&
1865 !owntype.hasTag(NONE)) {
1866 //constant folding
1867 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1868 }
1869 result = check(tree, owntype, KindSelector.VAL, resultInfo);
1870 }
1871 //where
1872 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1873 switch (tree.getTag()) {
1874 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1875 ((JCLiteral)tree).typetag == BOOLEAN ||
1876 ((JCLiteral)tree).typetag == BOT;
1877 case LAMBDA: case REFERENCE: return false;
1878 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1879 case CONDEXPR:
1880 JCConditional condTree = (JCConditional)tree;
1881 return isBooleanOrNumeric(env, condTree.truepart) &&
1882 isBooleanOrNumeric(env, condTree.falsepart);
1883 case APPLY:
1884 JCMethodInvocation speculativeMethodTree =
1885 (JCMethodInvocation)deferredAttr.attribSpeculative(
1886 tree, env, unknownExprInfo,
1887 argumentAttr.withLocalCacheContext());
1888 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
1889 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
1890 env.enclClass.type :
1891 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
1892 Type owntype = types.memberType(receiverType, msym).getReturnType();
1893 return primitiveOrBoxed(owntype);
1894 case NEWCLASS:
1895 JCExpression className =
1896 removeClassParams.translate(((JCNewClass)tree).clazz);
1897 JCExpression speculativeNewClassTree =
1898 (JCExpression)deferredAttr.attribSpeculative(
1899 className, env, unknownTypeInfo,
1900 argumentAttr.withLocalCacheContext());
1901 return primitiveOrBoxed(speculativeNewClassTree.type);
1902 default:
1903 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
1904 argumentAttr.withLocalCacheContext()).type;
1905 return primitiveOrBoxed(speculativeType);
1906 }
1907 }
1908 //where
1909 boolean primitiveOrBoxed(Type t) {
1910 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive());
1911 }
1912
1913 TreeTranslator removeClassParams = new TreeTranslator() {
1914 @Override
1915 public void visitTypeApply(JCTypeApply tree) {
1916 result = translate(tree.clazz);
1917 }
1918 };
1919
1920 CheckContext conditionalContext(CheckContext checkContext) {
1921 return new Check.NestedCheckContext(checkContext) {
1922 //this will use enclosing check context to check compatibility of
1923 //subexpression against target type; if we are in a method check context,
1924 //depending on whether boxing is allowed, we could have incompatibilities
1925 @Override
1926 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1927 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
1928 }
1929 };
1930 }
1931
1932 /** Compute the type of a conditional expression, after
1933 * checking that it exists. See JLS 15.25. Does not take into
1934 * account the special case where condition and both arms
1935 * are constants.
1936 *
1937 * @param pos The source position to be used for error
1938 * diagnostics.
1939 * @param thentype The type of the expression's then-part.
1940 * @param elsetype The type of the expression's else-part.
1941 */
1942 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
1943 if (condTypes.isEmpty()) {
1944 return syms.objectType; //TODO: how to handle?
1945 }
1946 Type first = condTypes.head;
1947 // If same type, that is the result
1948 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
1949 return first.baseType();
1950
1951 List<Type> unboxedTypes = condTypes.stream()
1952 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
1953 .collect(List.collector());
1954
1955 // Otherwise, if both arms can be converted to a numeric
1956 // type, return the least numeric type that fits both arms
1957 // (i.e. return larger of the two, or return int if one
1958 // arm is short, the other is char).
1959 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
1960 // If one arm has an integer subrange type (i.e., byte,
1961 // short, or char), and the other is an integer constant
1962 // that fits into the subrange, return the subrange type.
1963 for (Type type : unboxedTypes) {
1964 if (!type.getTag().isStrictSubRangeOf(INT)) {
1965 continue;
1966 }
1967 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
1968 return type.baseType();
1969 }
1970
1971 for (TypeTag tag : primitiveTags) {
1972 Type candidate = syms.typeOfTag[tag.ordinal()];
1973 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
1974 return candidate;
1975 }
1976 }
1977 }
1978
1979 // Those were all the cases that could result in a primitive
1980 condTypes = condTypes.stream()
1981 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
1982 .collect(List.collector());
1983
1984 for (Type type : condTypes) {
1985 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
1986 return type.baseType();
1987 }
1988
1989 Iterator<DiagnosticPosition> posIt = positions.iterator();
1990
1991 condTypes = condTypes.stream()
1992 .map(t -> chk.checkNonVoid(posIt.next(), t))
1993 .collect(List.collector());
1994
1995 // both are known to be reference types. The result is
1996 // lub(thentype,elsetype). This cannot fail, as it will
1997 // always be possible to infer "Object" if nothing better.
1998 return types.lub(condTypes.stream().map(t -> t.baseType()).collect(List.collector()));
1999 }
2000
2001 final static TypeTag[] primitiveTags = new TypeTag[]{
2002 BYTE,
2003 CHAR,
2004 SHORT,
2005 INT,
2006 LONG,
2007 FLOAT,
2008 DOUBLE,
2009 BOOLEAN,
2010 };
2011
2012 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2013 Env<AttrContext> env1 = env.dup(env.tree, env.info.dup(env.info.scope.dup()));
2014 bindings.forEach(env1.info.scope::enter);
2015 return env1;
2016 }
2017
2018 public void visitIf(JCIf tree) {
2019 attribExpr(tree.cond, env, syms.booleanType);
2020
2021 // if (x) { y } [ else z ]
2022 // include x's bindings when true in y
2023 // include x's bindings when false in z
2024
2025 List<BindingSymbol> thenBindings = matchBindingsComputer.getMatchBindings(tree.cond, true);
2026 Env<AttrContext> thenEnv = bindingEnv(env, thenBindings);
2027
2028 try {
2029 attribStat(tree.thenpart, thenEnv);
2030 } finally {
2031 thenEnv.info.scope.leave();
2032 }
2033
2034 preFlow(tree.thenpart);
2035 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2036 boolean aliveAfterElse;
2037 List<BindingSymbol> elseBindings = matchBindingsComputer.getMatchBindings(tree.cond, false);
2038
2039 if (tree.elsepart != null) {
2040 Env<AttrContext> elseEnv = bindingEnv(env, elseBindings);
2041 try {
2042 attribStat(tree.elsepart, elseEnv);
2043 } finally {
2044 elseEnv.info.scope.leave();
2045 }
2046 preFlow(tree.elsepart);
2047 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2048 } else {
2049 aliveAfterElse = true;
2050 }
2051
2052 chk.checkEmptyIf(tree);
2053
2054 List<BindingSymbol> afterIfBindings = List.nil();
2055
2056 if (aliveAfterThen && !aliveAfterElse) {
2057 afterIfBindings = thenBindings;
2058 } else if (aliveAfterElse && !aliveAfterThen) {
2059 afterIfBindings = elseBindings;
2060 }
2061
2062 afterIfBindings.forEach(env.info.scope::enter);
2063 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2064
2065 result = null;
2066 }
2067
2068 void preFlow(JCTree tree) {
2069 new PostAttrAnalyzer() {
2070 @Override
2071 public void scan(JCTree tree) {
2072 if (tree == null ||
2073 (tree.type != null &&
2074 tree.type == Type.stuckType)) {
2075 //don't touch stuck expressions!
2076 return;
2077 }
2078 super.scan(tree);
2079 }
2080 }.scan(tree);
2081 }
2082
2083 public void visitExec(JCExpressionStatement tree) {
2084 //a fresh environment is required for 292 inference to work properly ---
2085 //see Infer.instantiatePolymorphicSignatureInstance()
2086 Env<AttrContext> localEnv = env.dup(tree);
2087 attribExpr(tree.expr, localEnv);
2088 result = null;
2089 }
2090
2091 public void visitBreak(JCBreak tree) {
2092 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2093 result = null;
2094 }
2095
2096 public void visitYield(JCYield tree) {
2097 if (env.info.yieldResult != null) {
2098 attribTree(tree.value, env, env.info.yieldResult);
2099 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2100 } else {
2101 log.error(tree.pos(), tree.value.hasTag(PARENS)
2102 ? Errors.NoSwitchExpressionQualify
2103 : Errors.NoSwitchExpression);
2104 attribTree(tree.value, env, unknownExprInfo);
2105 }
2106 result = null;
2107 }
2108
2109 public void visitContinue(JCContinue tree) {
2110 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2111 result = null;
2112 }
2113 //where
2114 /** Return the target of a break, continue or yield statement,
2115 * if it exists, report an error if not.
2116 * Note: The target of a labelled break or continue is the
2117 * (non-labelled) statement tree referred to by the label,
2118 * not the tree representing the labelled statement itself.
2119 *
2120 * @param pos The position to be used for error diagnostics
2121 * @param tag The tag of the jump statement. This is either
2122 * Tree.BREAK or Tree.CONTINUE.
2123 * @param label The label of the jump statement, or null if no
2124 * label is given.
2125 * @param env The environment current at the jump statement.
2126 */
2127 private JCTree findJumpTarget(DiagnosticPosition pos,
2128 JCTree.Tag tag,
2129 Name label,
2130 Env<AttrContext> env) {
2131 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2132
2133 if (jumpTarget.snd != null) {
2134 log.error(pos, jumpTarget.snd);
2135 }
2136
2137 return jumpTarget.fst;
2138 }
2139 /** Return the target of a break or continue statement, if it exists,
2140 * report an error if not.
2141 * Note: The target of a labelled break or continue is the
2142 * (non-labelled) statement tree referred to by the label,
2143 * not the tree representing the labelled statement itself.
2144 *
2145 * @param tag The tag of the jump statement. This is either
2146 * Tree.BREAK or Tree.CONTINUE.
2147 * @param label The label of the jump statement, or null if no
2148 * label is given.
2149 * @param env The environment current at the jump statement.
2150 */
2151 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2152 Name label,
2153 Env<AttrContext> env) {
2154 // Search environments outwards from the point of jump.
2155 Env<AttrContext> env1 = env;
2156 JCDiagnostic.Error pendingError = null;
2157 LOOP:
2158 while (env1 != null) {
2159 switch (env1.tree.getTag()) {
2160 case LABELLED:
2161 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2162 if (label == labelled.label) {
2163 // If jump is a continue, check that target is a loop.
2164 if (tag == CONTINUE) {
2165 if (!labelled.body.hasTag(DOLOOP) &&
2166 !labelled.body.hasTag(WHILELOOP) &&
2167 !labelled.body.hasTag(FORLOOP) &&
2168 !labelled.body.hasTag(FOREACHLOOP)) {
2169 pendingError = Errors.NotLoopLabel(label);
2170 }
2171 // Found labelled statement target, now go inwards
2172 // to next non-labelled tree.
2173 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2174 } else {
2175 return Pair.of(labelled, pendingError);
2176 }
2177 }
2178 break;
2179 case DOLOOP:
2180 case WHILELOOP:
2181 case FORLOOP:
2182 case FOREACHLOOP:
2183 if (label == null) return Pair.of(env1.tree, pendingError);
2184 break;
2185 case SWITCH:
2186 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2187 break;
2188 case SWITCH_EXPRESSION:
2189 if (tag == YIELD) {
2190 return Pair.of(env1.tree, null);
2191 } else if (tag == BREAK) {
2192 pendingError = Errors.BreakOutsideSwitchExpression;
2193 } else {
2194 pendingError = Errors.ContinueOutsideSwitchExpression;
2195 }
2196 break;
2197 case LAMBDA:
2198 case METHODDEF:
2199 case CLASSDEF:
2200 break LOOP;
2201 default:
2202 }
2203 env1 = env1.next;
2204 }
2205 if (label != null)
2206 return Pair.of(null, Errors.UndefLabel(label));
2207 else if (pendingError != null)
2208 return Pair.of(null, pendingError);
2209 else if (tag == CONTINUE)
2210 return Pair.of(null, Errors.ContOutsideLoop);
2211 else
2212 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2213 }
2214
2215 public void visitReturn(JCReturn tree) {
2216 // Check that there is an enclosing method which is
2217 // nested within than the enclosing class.
2218 if (env.info.returnResult == null) {
2219 log.error(tree.pos(), Errors.RetOutsideMeth);
2220 } else if (env.info.yieldResult != null) {
2221 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2222 } else if (!env.info.isLambda &&
2223 !env.info.isNewClass &&
2224 env.enclMethod != null &&
2225 TreeInfo.isCompactConstructor(env.enclMethod)) {
2226 log.error(env.enclMethod,
2227 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym, Fragments.CanonicalCantHaveReturnStatement));
2228 } else {
2229 // Attribute return expression, if it exists, and check that
2230 // it conforms to result type of enclosing method.
2231 if (tree.expr != null) {
2232 if (env.info.returnResult.pt.hasTag(VOID)) {
2233 env.info.returnResult.checkContext.report(tree.expr.pos(),
2234 diags.fragment(Fragments.UnexpectedRetVal));
2235 }
2236 attribTree(tree.expr, env, env.info.returnResult);
2237 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2238 !env.info.returnResult.pt.hasTag(NONE)) {
2239 env.info.returnResult.checkContext.report(tree.pos(),
2240 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2241 }
2242 }
2243 result = null;
2244 }
2245
2246 public void visitThrow(JCThrow tree) {
2247 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
2248 if (allowPoly) {
2249 chk.checkType(tree, owntype, syms.throwableType);
2250 }
2251 result = null;
2252 }
2253
2254 public void visitAssert(JCAssert tree) {
2255 attribExpr(tree.cond, env, syms.booleanType);
2256 if (tree.detail != null) {
2257 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2258 }
2259 result = null;
2260 }
2261
2262 /** Visitor method for method invocations.
2263 * NOTE: The method part of an application will have in its type field
2264 * the return type of the method, not the method's type itself!
2265 */
2266 public void visitApply(JCMethodInvocation tree) {
2267 // The local environment of a method application is
2268 // a new environment nested in the current one.
2269 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2270
2271 // The types of the actual method arguments.
2272 List<Type> argtypes;
2273
2274 // The types of the actual method type arguments.
2275 List<Type> typeargtypes = null;
2276
2277 Name methName = TreeInfo.name(tree.meth);
2278
2279 boolean isConstructorCall =
2280 methName == names._this || methName == names._super;
2281
2282 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2283 if (isConstructorCall) {
2284 // We are seeing a ...this(...) or ...super(...) call.
2285 // Check that this is the first statement in a constructor.
2286 if (checkFirstConstructorStat(tree, env.enclMethod, true)) {
2287
2288 // Record the fact
2289 // that this is a constructor call (using isSelfCall).
2290 localEnv.info.isSelfCall = true;
2291
2292 // Attribute arguments, yielding list of argument types.
2293 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2294 argtypes = argtypesBuf.toList();
2295 typeargtypes = attribTypes(tree.typeargs, localEnv);
2296
2297 // Variable `site' points to the class in which the called
2298 // constructor is defined.
2299 Type site = env.enclClass.sym.type;
2300 if (methName == names._super) {
2301 if (site == syms.objectType) {
2302 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2303 site = types.createErrorType(syms.objectType);
2304 } else {
2305 site = types.supertype(site);
2306 }
2307 }
2308
2309 if (site.hasTag(CLASS)) {
2310 Type encl = site.getEnclosingType();
2311 while (encl != null && encl.hasTag(TYPEVAR))
2312 encl = encl.getUpperBound();
2313 if (encl.hasTag(CLASS)) {
2314 // we are calling a nested class
2315
2316 if (tree.meth.hasTag(SELECT)) {
2317 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2318
2319 // We are seeing a prefixed call, of the form
2320 // <expr>.super(...).
2321 // Check that the prefix expression conforms
2322 // to the outer instance type of the class.
2323 chk.checkRefType(qualifier.pos(),
2324 attribExpr(qualifier, localEnv,
2325 encl));
2326 } else if (methName == names._super) {
2327 // qualifier omitted; check for existence
2328 // of an appropriate implicit qualifier.
2329 rs.resolveImplicitThis(tree.meth.pos(),
2330 localEnv, site, true);
2331 }
2332 } else if (tree.meth.hasTag(SELECT)) {
2333 log.error(tree.meth.pos(),
2334 Errors.IllegalQualNotIcls(site.tsym));
2335 }
2336
2337 // if we're calling a java.lang.Enum constructor,
2338 // prefix the implicit String and int parameters
2339 if (site.tsym == syms.enumSym)
2340 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2341
2342 // Resolve the called constructor under the assumption
2343 // that we are referring to a superclass instance of the
2344 // current instance (JLS ???).
2345 boolean selectSuperPrev = localEnv.info.selectSuper;
2346 localEnv.info.selectSuper = true;
2347 localEnv.info.pendingResolutionPhase = null;
2348 Symbol sym = rs.resolveConstructor(
2349 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2350 localEnv.info.selectSuper = selectSuperPrev;
2351
2352 // Set method symbol to resolved constructor...
2353 TreeInfo.setSymbol(tree.meth, sym);
2354
2355 // ...and check that it is legal in the current context.
2356 // (this will also set the tree's type)
2357 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2358 checkId(tree.meth, site, sym, localEnv,
2359 new ResultInfo(kind, mpt));
2360 }
2361 // Otherwise, `site' is an error type and we do nothing
2362 }
2363 result = tree.type = syms.voidType;
2364 } else {
2365 // Otherwise, we are seeing a regular method call.
2366 // Attribute the arguments, yielding list of argument types, ...
2367 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2368 argtypes = argtypesBuf.toList();
2369 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2370
2371 // ... and attribute the method using as a prototype a methodtype
2372 // whose formal argument types is exactly the list of actual
2373 // arguments (this will also set the method symbol).
2374 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2375 localEnv.info.pendingResolutionPhase = null;
2376 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2377
2378 // Compute the result type.
2379 Type restype = mtype.getReturnType();
2380 if (restype.hasTag(WILDCARD))
2381 throw new AssertionError(mtype);
2382
2383 Type qualifier = (tree.meth.hasTag(SELECT))
2384 ? ((JCFieldAccess) tree.meth).selected.type
2385 : env.enclClass.sym.type;
2386 Symbol msym = TreeInfo.symbol(tree.meth);
2387 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2388
2389 chk.checkRefTypes(tree.typeargs, typeargtypes);
2390
2391 // Check that value of resulting type is admissible in the
2392 // current context. Also, capture the return type
2393 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2394 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2395 }
2396 chk.validate(tree.typeargs, localEnv);
2397 }
2398 //where
2399 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2400 if (msym != null &&
2401 msym.owner == syms.objectType.tsym &&
2402 methodName == names.getClass &&
2403 argtypes.isEmpty()) {
2404 // as a special case, x.getClass() has type Class<? extends |X|>
2405 return new ClassType(restype.getEnclosingType(),
2406 List.of(new WildcardType(types.erasure(qualifierType),
2407 BoundKind.EXTENDS,
2408 syms.boundClass)),
2409 restype.tsym,
2410 restype.getMetadata());
2411 } else if (msym != null &&
2412 msym.owner == syms.arrayClass &&
2413 methodName == names.clone &&
2414 types.isArray(qualifierType)) {
2415 // as a special case, array.clone() has a result that is
2416 // the same as static type of the array being cloned
2417 return qualifierType;
2418 } else {
2419 return restype;
2420 }
2421 }
2422
2423 /** Check that given application node appears as first statement
2424 * in a constructor call.
2425 * @param tree The application node
2426 * @param enclMethod The enclosing method of the application.
2427 * @param error Should an error be issued?
2428 */
2429 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2430 if (enclMethod != null && enclMethod.name == names.init) {
2431 JCBlock body = enclMethod.body;
2432 if (body.stats.head.hasTag(EXEC) &&
2433 ((JCExpressionStatement) body.stats.head).expr == tree)
2434 return true;
2435 }
2436 if (error) {
2437 log.error(tree.pos(),
2438 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2439 }
2440 return false;
2441 }
2442
2443 /** Obtain a method type with given argument types.
2444 */
2445 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2446 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2447 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2448 }
2449
2450 public void visitNewClass(final JCNewClass tree) {
2451 Type owntype = types.createErrorType(tree.type);
2452
2453 // The local environment of a class creation is
2454 // a new environment nested in the current one.
2455 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2456
2457 // The anonymous inner class definition of the new expression,
2458 // if one is defined by it.
2459 JCClassDecl cdef = tree.def;
2460
2461 // If enclosing class is given, attribute it, and
2462 // complete class name to be fully qualified
2463 JCExpression clazz = tree.clazz; // Class field following new
2464 JCExpression clazzid; // Identifier in class field
2465 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2466 annoclazzid = null;
2467
2468 if (clazz.hasTag(TYPEAPPLY)) {
2469 clazzid = ((JCTypeApply) clazz).clazz;
2470 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2471 annoclazzid = (JCAnnotatedType) clazzid;
2472 clazzid = annoclazzid.underlyingType;
2473 }
2474 } else {
2475 if (clazz.hasTag(ANNOTATED_TYPE)) {
2476 annoclazzid = (JCAnnotatedType) clazz;
2477 clazzid = annoclazzid.underlyingType;
2478 } else {
2479 clazzid = clazz;
2480 }
2481 }
2482
2483 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2484
2485 if (tree.encl != null) {
2486 // We are seeing a qualified new, of the form
2487 // <expr>.new C <...> (...) ...
2488 // In this case, we let clazz stand for the name of the
2489 // allocated class C prefixed with the type of the qualifier
2490 // expression, so that we can
2491 // resolve it with standard techniques later. I.e., if
2492 // <expr> has type T, then <expr>.new C <...> (...)
2493 // yields a clazz T.C.
2494 Type encltype = chk.checkRefType(tree.encl.pos(),
2495 attribExpr(tree.encl, env));
2496 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2497 // from expr to the combined type, or not? Yes, do this.
2498 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2499 ((JCIdent) clazzid).name);
2500
2501 EndPosTable endPosTable = this.env.toplevel.endPositions;
2502 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
2503 if (clazz.hasTag(ANNOTATED_TYPE)) {
2504 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2505 List<JCAnnotation> annos = annoType.annotations;
2506
2507 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2508 clazzid1 = make.at(tree.pos).
2509 TypeApply(clazzid1,
2510 ((JCTypeApply) clazz).arguments);
2511 }
2512
2513 clazzid1 = make.at(tree.pos).
2514 AnnotatedType(annos, clazzid1);
2515 } else if (clazz.hasTag(TYPEAPPLY)) {
2516 clazzid1 = make.at(tree.pos).
2517 TypeApply(clazzid1,
2518 ((JCTypeApply) clazz).arguments);
2519 }
2520
2521 clazz = clazzid1;
2522 }
2523
2524 // Attribute clazz expression and store
2525 // symbol + type back into the attributed tree.
2526 Type clazztype;
2527
2528 try {
2529 env.info.isNewClass = true;
2530 clazztype = TreeInfo.isEnumInit(env.tree) ?
2531 attribIdentAsEnumType(env, (JCIdent)clazz) :
2532 attribType(clazz, env);
2533 } finally {
2534 env.info.isNewClass = false;
2535 }
2536
2537 clazztype = chk.checkDiamond(tree, clazztype);
2538 chk.validate(clazz, localEnv);
2539 if (tree.encl != null) {
2540 // We have to work in this case to store
2541 // symbol + type back into the attributed tree.
2542 tree.clazz.type = clazztype;
2543 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2544 clazzid.type = ((JCIdent) clazzid).sym.type;
2545 if (annoclazzid != null) {
2546 annoclazzid.type = clazzid.type;
2547 }
2548 if (!clazztype.isErroneous()) {
2549 if (cdef != null && clazztype.tsym.isInterface()) {
2550 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2551 } else if (clazztype.tsym.isStatic()) {
2552 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2553 }
2554 }
2555 } else if (!clazztype.tsym.isInterface() &&
2556 clazztype.getEnclosingType().hasTag(CLASS)) {
2557 // Check for the existence of an apropos outer instance
2558 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2559 }
2560
2561 // Attribute constructor arguments.
2562 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2563 final KindSelector pkind =
2564 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2565 List<Type> argtypes = argtypesBuf.toList();
2566 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2567
2568 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2569 // Enums may not be instantiated except implicitly
2570 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2571 (!env.tree.hasTag(VARDEF) ||
2572 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2573 ((JCVariableDecl) env.tree).init != tree))
2574 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2575
2576 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2577 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2578 boolean skipNonDiamondPath = false;
2579 // Check that class is not abstract
2580 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2581 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2582 log.error(tree.pos(),
2583 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2584 skipNonDiamondPath = true;
2585 } else if (cdef != null && clazztype.tsym.isInterface()) {
2586 // Check that no constructor arguments are given to
2587 // anonymous classes implementing an interface
2588 if (!argtypes.isEmpty())
2589 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2590
2591 if (!typeargtypes.isEmpty())
2592 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2593
2594 // Error recovery: pretend no arguments were supplied.
2595 argtypes = List.nil();
2596 typeargtypes = List.nil();
2597 skipNonDiamondPath = true;
2598 }
2599 if (TreeInfo.isDiamond(tree)) {
2600 ClassType site = new ClassType(clazztype.getEnclosingType(),
2601 clazztype.tsym.type.getTypeArguments(),
2602 clazztype.tsym,
2603 clazztype.getMetadata());
2604
2605 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2606 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2607 diamondEnv.info.pendingResolutionPhase = null;
2608
2609 //if the type of the instance creation expression is a class type
2610 //apply method resolution inference (JLS 15.12.2.7). The return type
2611 //of the resolved constructor will be a partially instantiated type
2612 Symbol constructor = rs.resolveDiamond(tree.pos(),
2613 diamondEnv,
2614 site,
2615 argtypes,
2616 typeargtypes);
2617 tree.constructor = constructor.baseSymbol();
2618
2619 final TypeSymbol csym = clazztype.tsym;
2620 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2621 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2622 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2623 constructorType = checkId(tree, site,
2624 constructor,
2625 diamondEnv,
2626 diamondResult);
2627
2628 tree.clazz.type = types.createErrorType(clazztype);
2629 if (!constructorType.isErroneous()) {
2630 tree.clazz.type = clazz.type = constructorType.getReturnType();
2631 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2632 }
2633 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2634 }
2635
2636 // Resolve the called constructor under the assumption
2637 // that we are referring to a superclass instance of the
2638 // current instance (JLS ???).
2639 else if (!skipNonDiamondPath) {
2640 //the following code alters some of the fields in the current
2641 //AttrContext - hence, the current context must be dup'ed in
2642 //order to avoid downstream failures
2643 Env<AttrContext> rsEnv = localEnv.dup(tree);
2644 rsEnv.info.selectSuper = cdef != null;
2645 rsEnv.info.pendingResolutionPhase = null;
2646 tree.constructor = rs.resolveConstructor(
2647 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2648 if (cdef == null) { //do not check twice!
2649 tree.constructorType = checkId(tree,
2650 clazztype,
2651 tree.constructor,
2652 rsEnv,
2653 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2654 if (rsEnv.info.lastResolveVarargs())
2655 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2656 }
2657 }
2658
2659 if (cdef != null) {
2660 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2661 return;
2662 }
2663
2664 if (tree.constructor != null && tree.constructor.kind == MTH)
2665 owntype = clazztype;
2666 }
2667 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2668 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2669 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2670 //we need to wait for inference to finish and then replace inference vars in the constructor type
2671 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2672 instantiatedContext -> {
2673 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2674 });
2675 }
2676 chk.validate(tree.typeargs, localEnv);
2677 }
2678
2679 // where
2680 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2681 JCClassDecl cdef, Env<AttrContext> localEnv,
2682 List<Type> argtypes, List<Type> typeargtypes,
2683 KindSelector pkind) {
2684 // We are seeing an anonymous class instance creation.
2685 // In this case, the class instance creation
2686 // expression
2687 //
2688 // E.new <typeargs1>C<typargs2>(args) { ... }
2689 //
2690 // is represented internally as
2691 //
2692 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2693 //
2694 // This expression is then *transformed* as follows:
2695 //
2696 // (1) add an extends or implements clause
2697 // (2) add a constructor.
2698 //
2699 // For instance, if C is a class, and ET is the type of E,
2700 // the expression
2701 //
2702 // E.new <typeargs1>C<typargs2>(args) { ... }
2703 //
2704 // is translated to (where X is a fresh name and typarams is the
2705 // parameter list of the super constructor):
2706 //
2707 // new <typeargs1>X(<*nullchk*>E, args) where
2708 // X extends C<typargs2> {
2709 // <typarams> X(ET e, args) {
2710 // e.<typeargs1>super(args)
2711 // }
2712 // ...
2713 // }
2714 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2715 final boolean isDiamond = TreeInfo.isDiamond(tree);
2716 if (isDiamond
2717 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2718 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2719 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2720 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2721 instantiatedContext -> {
2722 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2723 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2724 ResultInfo prevResult = this.resultInfo;
2725 try {
2726 this.resultInfo = resultInfoForClassDefinition;
2727 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2728 localEnv, argtypes, typeargtypes, pkind);
2729 } finally {
2730 this.resultInfo = prevResult;
2731 }
2732 });
2733 } else {
2734 if (isDiamond && clazztype.hasTag(CLASS)) {
2735 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2736 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2737 // One or more types inferred in the previous steps is non-denotable.
2738 Fragment fragment = Diamond(clazztype.tsym);
2739 log.error(tree.clazz.pos(),
2740 Errors.CantApplyDiamond1(
2741 fragment,
2742 invalidDiamondArgs.size() > 1 ?
2743 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2744 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2745 }
2746 // For <>(){}, inferred types must also be accessible.
2747 for (Type t : clazztype.getTypeArguments()) {
2748 rs.checkAccessibleType(env, t);
2749 }
2750 }
2751
2752 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2753 // false for isInterface call even when the original type is an interface.
2754 boolean implementing = clazztype.tsym.isInterface() ||
2755 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2756 clazztype.getOriginalType().tsym.isInterface();
2757
2758 if (implementing) {
2759 cdef.implementing = List.of(clazz);
2760 } else {
2761 cdef.extending = clazz;
2762 }
2763
2764 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2765 isSerializable(clazztype)) {
2766 localEnv.info.isSerializable = true;
2767 }
2768
2769 attribStat(cdef, localEnv);
2770
2771 List<Type> finalargtypes;
2772 // If an outer instance is given,
2773 // prefix it to the constructor arguments
2774 // and delete it from the new expression
2775 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2776 finalargtypes = argtypes.prepend(tree.encl.type);
2777 } else {
2778 finalargtypes = argtypes;
2779 }
2780
2781 // Reassign clazztype and recompute constructor. As this necessarily involves
2782 // another attribution pass for deferred types in the case of <>, replicate
2783 // them. Original arguments have right decorations already.
2784 if (isDiamond && pkind.contains(KindSelector.POLY)) {
2785 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
2786 }
2787
2788 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
2789 : cdef.sym.type;
2790 Symbol sym = tree.constructor = rs.resolveConstructor(
2791 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
2792 Assert.check(!sym.kind.isResolutionError());
2793 tree.constructor = sym;
2794 tree.constructorType = checkId(tree,
2795 clazztype,
2796 tree.constructor,
2797 localEnv,
2798 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2799 }
2800 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
2801 clazztype : types.createErrorType(tree.type);
2802 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
2803 chk.validate(tree.typeargs, localEnv);
2804 }
2805
2806 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
2807 return new Check.NestedCheckContext(checkContext) {
2808 @Override
2809 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2810 enclosingContext.report(clazz.clazz,
2811 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
2812 }
2813 };
2814 }
2815
2816 /** Make an attributed null check tree.
2817 */
2818 public JCExpression makeNullCheck(JCExpression arg) {
2819 // optimization: new Outer() can never be null; skip null check
2820 if (arg.getTag() == NEWCLASS)
2821 return arg;
2822 // optimization: X.this is never null; skip null check
2823 Name name = TreeInfo.name(arg);
2824 if (name == names._this || name == names._super) return arg;
2825
2826 JCTree.Tag optag = NULLCHK;
2827 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2828 tree.operator = operators.resolveUnary(arg, optag, arg.type);
2829 tree.type = arg.type;
2830 return tree;
2831 }
2832
2833 public void visitNewArray(JCNewArray tree) {
2834 Type owntype = types.createErrorType(tree.type);
2835 Env<AttrContext> localEnv = env.dup(tree);
2836 Type elemtype;
2837 if (tree.elemtype != null) {
2838 elemtype = attribType(tree.elemtype, localEnv);
2839 chk.validate(tree.elemtype, localEnv);
2840 owntype = elemtype;
2841 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2842 attribExpr(l.head, localEnv, syms.intType);
2843 owntype = new ArrayType(owntype, syms.arrayClass);
2844 }
2845 } else {
2846 // we are seeing an untyped aggregate { ... }
2847 // this is allowed only if the prototype is an array
2848 if (pt().hasTag(ARRAY)) {
2849 elemtype = types.elemtype(pt());
2850 } else {
2851 if (!pt().hasTag(ERROR) &&
2852 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
2853 log.error(tree.pos(),
2854 Errors.IllegalInitializerForType(pt()));
2855 }
2856 elemtype = types.createErrorType(pt());
2857 }
2858 }
2859 if (tree.elems != null) {
2860 attribExprs(tree.elems, localEnv, elemtype);
2861 owntype = new ArrayType(elemtype, syms.arrayClass);
2862 }
2863 if (!types.isReifiable(elemtype))
2864 log.error(tree.pos(), Errors.GenericArrayCreation);
2865 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2866 }
2867
2868 /*
2869 * A lambda expression can only be attributed when a target-type is available.
2870 * In addition, if the target-type is that of a functional interface whose
2871 * descriptor contains inference variables in argument position the lambda expression
2872 * is 'stuck' (see DeferredAttr).
2873 */
2874 @Override
2875 public void visitLambda(final JCLambda that) {
2876 boolean wrongContext = false;
2877 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2878 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
2879 //lambda only allowed in assignment or method invocation/cast context
2880 log.error(that.pos(), Errors.UnexpectedLambda);
2881 }
2882 resultInfo = recoveryInfo;
2883 wrongContext = true;
2884 }
2885 //create an environment for attribution of the lambda expression
2886 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2887 boolean needsRecovery =
2888 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2889 try {
2890 if (needsRecovery && isSerializable(pt())) {
2891 localEnv.info.isSerializable = true;
2892 localEnv.info.isSerializableLambda = true;
2893 }
2894 localEnv.info.isLambda = true;
2895 List<Type> explicitParamTypes = null;
2896 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2897 //attribute lambda parameters
2898 attribStats(that.params, localEnv);
2899 explicitParamTypes = TreeInfo.types(that.params);
2900 }
2901
2902 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
2903 Type currentTarget = targetInfo.target;
2904 Type lambdaType = targetInfo.descriptor;
2905
2906 if (currentTarget.isErroneous()) {
2907 result = that.type = currentTarget;
2908 return;
2909 }
2910
2911 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2912
2913 if (lambdaType.hasTag(FORALL)) {
2914 //lambda expression target desc cannot be a generic method
2915 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
2916 kindName(currentTarget.tsym),
2917 currentTarget.tsym);
2918 resultInfo.checkContext.report(that, diags.fragment(msg));
2919 result = that.type = types.createErrorType(pt());
2920 return;
2921 }
2922
2923 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2924 //add param type info in the AST
2925 List<Type> actuals = lambdaType.getParameterTypes();
2926 List<JCVariableDecl> params = that.params;
2927
2928 boolean arityMismatch = false;
2929
2930 while (params.nonEmpty()) {
2931 if (actuals.isEmpty()) {
2932 //not enough actuals to perform lambda parameter inference
2933 arityMismatch = true;
2934 }
2935 //reset previously set info
2936 Type argType = arityMismatch ?
2937 syms.errType :
2938 actuals.head;
2939 if (params.head.isImplicitlyTyped()) {
2940 setSyntheticVariableType(params.head, argType);
2941 }
2942 params.head.sym = null;
2943 actuals = actuals.isEmpty() ?
2944 actuals :
2945 actuals.tail;
2946 params = params.tail;
2947 }
2948
2949 //attribute lambda parameters
2950 attribStats(that.params, localEnv);
2951
2952 if (arityMismatch) {
2953 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
2954 result = that.type = types.createErrorType(currentTarget);
2955 return;
2956 }
2957 }
2958
2959 //from this point on, no recovery is needed; if we are in assignment context
2960 //we will be able to attribute the whole lambda body, regardless of errors;
2961 //if we are in a 'check' method context, and the lambda is not compatible
2962 //with the target-type, it will be recovered anyway in Attr.checkId
2963 needsRecovery = false;
2964
2965 ResultInfo bodyResultInfo = localEnv.info.returnResult =
2966 lambdaBodyResult(that, lambdaType, resultInfo);
2967
2968 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2969 attribTree(that.getBody(), localEnv, bodyResultInfo);
2970 } else {
2971 JCBlock body = (JCBlock)that.body;
2972 if (body == breakTree &&
2973 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2974 breakTreeFound(copyEnv(localEnv));
2975 }
2976 attribStats(body.stats, localEnv);
2977 }
2978
2979 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
2980
2981 boolean isSpeculativeRound =
2982 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2983
2984 preFlow(that);
2985 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2986
2987 that.type = currentTarget; //avoids recovery at this stage
2988 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2989
2990 if (!isSpeculativeRound) {
2991 //add thrown types as bounds to the thrown types free variables if needed:
2992 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2993 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2994 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
2995 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
2996 }
2997 }
2998
2999 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3000 }
3001 result = wrongContext ? that.type = types.createErrorType(pt())
3002 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3003 } catch (Types.FunctionDescriptorLookupError ex) {
3004 JCDiagnostic cause = ex.getDiagnostic();
3005 resultInfo.checkContext.report(that, cause);
3006 result = that.type = types.createErrorType(pt());
3007 return;
3008 } catch (CompletionFailure cf) {
3009 chk.completionError(that.pos(), cf);
3010 } catch (Throwable t) {
3011 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3012 //as that would likely cause the same exception again.
3013 needsRecovery = false;
3014 throw t;
3015 } finally {
3016 localEnv.info.scope.leave();
3017 if (needsRecovery) {
3018 attribTree(that, env, recoveryInfo);
3019 }
3020 }
3021 }
3022 //where
3023 class TargetInfo {
3024 Type target;
3025 Type descriptor;
3026
3027 public TargetInfo(Type target, Type descriptor) {
3028 this.target = target;
3029 this.descriptor = descriptor;
3030 }
3031 }
3032
3033 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3034 Type lambdaType;
3035 Type currentTarget = resultInfo.pt;
3036 if (resultInfo.pt != Type.recoveryType) {
3037 /* We need to adjust the target. If the target is an
3038 * intersection type, for example: SAM & I1 & I2 ...
3039 * the target will be updated to SAM
3040 */
3041 currentTarget = targetChecker.visit(currentTarget, that);
3042 if (!currentTarget.isIntersection()) {
3043 if (explicitParamTypes != null) {
3044 currentTarget = infer.instantiateFunctionalInterface(that,
3045 currentTarget, explicitParamTypes, resultInfo.checkContext);
3046 }
3047 currentTarget = types.removeWildcards(currentTarget);
3048 lambdaType = types.findDescriptorType(currentTarget);
3049 } else {
3050 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3051 ListBuffer<Type> components = new ListBuffer<>();
3052 for (Type bound : ict.getExplicitComponents()) {
3053 if (explicitParamTypes != null) {
3054 try {
3055 bound = infer.instantiateFunctionalInterface(that,
3056 bound, explicitParamTypes, resultInfo.checkContext);
3057 } catch (FunctionDescriptorLookupError t) {
3058 // do nothing
3059 }
3060 }
3061 bound = types.removeWildcards(bound);
3062 components.add(bound);
3063 }
3064 currentTarget = types.makeIntersectionType(components.toList());
3065 currentTarget.tsym.flags_field |= INTERFACE;
3066 lambdaType = types.findDescriptorType(currentTarget);
3067 }
3068
3069 } else {
3070 currentTarget = Type.recoveryType;
3071 lambdaType = fallbackDescriptorType(that);
3072 }
3073 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3074 //lambda expression target desc cannot be a generic method
3075 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3076 kindName(currentTarget.tsym),
3077 currentTarget.tsym);
3078 resultInfo.checkContext.report(that, diags.fragment(msg));
3079 currentTarget = types.createErrorType(pt());
3080 }
3081 return new TargetInfo(currentTarget, lambdaType);
3082 }
3083
3084 void preFlow(JCLambda tree) {
3085 new PostAttrAnalyzer() {
3086 @Override
3087 public void scan(JCTree tree) {
3088 if (tree == null ||
3089 (tree.type != null &&
3090 tree.type == Type.stuckType)) {
3091 //don't touch stuck expressions!
3092 return;
3093 }
3094 super.scan(tree);
3095 }
3096
3097 @Override
3098 public void visitClassDef(JCClassDecl that) {
3099 // or class declaration trees!
3100 }
3101
3102 public void visitLambda(JCLambda that) {
3103 // or lambda expressions!
3104 }
3105 }.scan(tree.body);
3106 }
3107
3108 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3109
3110 @Override
3111 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3112 return t.isIntersection() ?
3113 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3114 }
3115
3116 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3117 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3118 return ict;
3119 }
3120
3121 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3122 ListBuffer<Type> targs = new ListBuffer<>();
3123 ListBuffer<Type> supertypes = new ListBuffer<>();
3124 for (Type i : ict.interfaces_field) {
3125 if (i.isParameterized()) {
3126 targs.appendList(i.tsym.type.allparams());
3127 }
3128 supertypes.append(i.tsym.type);
3129 }
3130 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3131 notionalIntf.allparams_field = targs.toList();
3132 notionalIntf.tsym.flags_field |= INTERFACE;
3133 return notionalIntf.tsym;
3134 }
3135 };
3136
3137 private Type fallbackDescriptorType(JCExpression tree) {
3138 switch (tree.getTag()) {
3139 case LAMBDA:
3140 JCLambda lambda = (JCLambda)tree;
3141 List<Type> argtypes = List.nil();
3142 for (JCVariableDecl param : lambda.params) {
3143 argtypes = param.vartype != null && param.vartype.type != null ?
3144 argtypes.append(param.vartype.type) :
3145 argtypes.append(syms.errType);
3146 }
3147 return new MethodType(argtypes, Type.recoveryType,
3148 List.of(syms.throwableType), syms.methodClass);
3149 case REFERENCE:
3150 return new MethodType(List.nil(), Type.recoveryType,
3151 List.of(syms.throwableType), syms.methodClass);
3152 default:
3153 Assert.error("Cannot get here!");
3154 }
3155 return null;
3156 }
3157
3158 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3159 final InferenceContext inferenceContext, final Type... ts) {
3160 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3161 }
3162
3163 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3164 final InferenceContext inferenceContext, final List<Type> ts) {
3165 if (inferenceContext.free(ts)) {
3166 inferenceContext.addFreeTypeListener(ts,
3167 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3168 } else {
3169 for (Type t : ts) {
3170 rs.checkAccessibleType(env, t);
3171 }
3172 }
3173 }
3174
3175 /**
3176 * Lambda/method reference have a special check context that ensures
3177 * that i.e. a lambda return type is compatible with the expected
3178 * type according to both the inherited context and the assignment
3179 * context.
3180 */
3181 class FunctionalReturnContext extends Check.NestedCheckContext {
3182
3183 FunctionalReturnContext(CheckContext enclosingContext) {
3184 super(enclosingContext);
3185 }
3186
3187 @Override
3188 public boolean compatible(Type found, Type req, Warner warn) {
3189 //return type must be compatible in both current context and assignment context
3190 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3191 }
3192
3193 @Override
3194 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3195 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3196 }
3197 }
3198
3199 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3200
3201 JCExpression expr;
3202 boolean expStmtExpected;
3203
3204 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3205 super(enclosingContext);
3206 this.expr = expr;
3207 }
3208
3209 @Override
3210 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3211 if (expStmtExpected) {
3212 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3213 } else {
3214 super.report(pos, details);
3215 }
3216 }
3217
3218 @Override
3219 public boolean compatible(Type found, Type req, Warner warn) {
3220 //a void return is compatible with an expression statement lambda
3221 if (req.hasTag(VOID)) {
3222 expStmtExpected = true;
3223 return TreeInfo.isExpressionStatement(expr);
3224 } else {
3225 return super.compatible(found, req, warn);
3226 }
3227 }
3228 }
3229
3230 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3231 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3232 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3233 new FunctionalReturnContext(resultInfo.checkContext);
3234
3235 return descriptor.getReturnType() == Type.recoveryType ?
3236 recoveryInfo :
3237 new ResultInfo(KindSelector.VAL,
3238 descriptor.getReturnType(), funcContext);
3239 }
3240
3241 /**
3242 * Lambda compatibility. Check that given return types, thrown types, parameter types
3243 * are compatible with the expected functional interface descriptor. This means that:
3244 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3245 * types must be compatible with the return type of the expected descriptor.
3246 */
3247 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3248 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3249
3250 //return values have already been checked - but if lambda has no return
3251 //values, we must ensure that void/value compatibility is correct;
3252 //this amounts at checking that, if a lambda body can complete normally,
3253 //the descriptor's return type must be void
3254 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3255 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3256 Fragment msg =
3257 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3258 checkContext.report(tree,
3259 diags.fragment(msg));
3260 }
3261
3262 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3263 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3264 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3265 }
3266 }
3267
3268 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3269 * static field and that lambda has type annotations, these annotations will
3270 * also be stored at these fake clinit methods.
3271 *
3272 * LambdaToMethod also use fake clinit methods so they can be reused.
3273 * Also as LTM is a phase subsequent to attribution, the methods from
3274 * clinits can be safely removed by LTM to save memory.
3275 */
3276 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3277
3278 public MethodSymbol removeClinit(ClassSymbol sym) {
3279 return clinits.remove(sym);
3280 }
3281
3282 /* This method returns an environment to be used to attribute a lambda
3283 * expression.
3284 *
3285 * The owner of this environment is a method symbol. If the current owner
3286 * is not a method, for example if the lambda is used to initialize
3287 * a field, then if the field is:
3288 *
3289 * - an instance field, we use the first constructor.
3290 * - a static field, we create a fake clinit method.
3291 */
3292 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3293 Env<AttrContext> lambdaEnv;
3294 Symbol owner = env.info.scope.owner;
3295 if (owner.kind == VAR && owner.owner.kind == TYP) {
3296 //field initializer
3297 ClassSymbol enclClass = owner.enclClass();
3298 Symbol newScopeOwner = env.info.scope.owner;
3299 /* if the field isn't static, then we can get the first constructor
3300 * and use it as the owner of the environment. This is what
3301 * LTM code is doing to look for type annotations so we are fine.
3302 */
3303 if ((owner.flags() & STATIC) == 0) {
3304 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3305 newScopeOwner = s;
3306 break;
3307 }
3308 } else {
3309 /* if the field is static then we need to create a fake clinit
3310 * method, this method can later be reused by LTM.
3311 */
3312 MethodSymbol clinit = clinits.get(enclClass);
3313 if (clinit == null) {
3314 Type clinitType = new MethodType(List.nil(),
3315 syms.voidType, List.nil(), syms.methodClass);
3316 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3317 names.clinit, clinitType, enclClass);
3318 clinit.params = List.nil();
3319 clinits.put(enclClass, clinit);
3320 }
3321 newScopeOwner = clinit;
3322 }
3323 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3324 } else {
3325 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3326 }
3327 lambdaEnv.info.yieldResult = null;
3328 return lambdaEnv;
3329 }
3330
3331 @Override
3332 public void visitReference(final JCMemberReference that) {
3333 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3334 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3335 //method reference only allowed in assignment or method invocation/cast context
3336 log.error(that.pos(), Errors.UnexpectedMref);
3337 }
3338 result = that.type = types.createErrorType(pt());
3339 return;
3340 }
3341 final Env<AttrContext> localEnv = env.dup(that);
3342 try {
3343 //attribute member reference qualifier - if this is a constructor
3344 //reference, the expected kind must be a type
3345 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3346
3347 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3348 exprType = chk.checkConstructorRefType(that.expr, exprType);
3349 if (!exprType.isErroneous() &&
3350 exprType.isRaw() &&
3351 that.typeargs != null) {
3352 log.error(that.expr.pos(),
3353 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3354 Fragments.MrefInferAndExplicitParams));
3355 exprType = types.createErrorType(exprType);
3356 }
3357 }
3358
3359 if (exprType.isErroneous()) {
3360 //if the qualifier expression contains problems,
3361 //give up attribution of method reference
3362 result = that.type = exprType;
3363 return;
3364 }
3365
3366 if (TreeInfo.isStaticSelector(that.expr, names)) {
3367 //if the qualifier is a type, validate it; raw warning check is
3368 //omitted as we don't know at this stage as to whether this is a
3369 //raw selector (because of inference)
3370 chk.validate(that.expr, env, false);
3371 } else {
3372 Symbol lhsSym = TreeInfo.symbol(that.expr);
3373 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3374 }
3375 //attrib type-arguments
3376 List<Type> typeargtypes = List.nil();
3377 if (that.typeargs != null) {
3378 typeargtypes = attribTypes(that.typeargs, localEnv);
3379 }
3380
3381 boolean isTargetSerializable =
3382 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3383 isSerializable(pt());
3384 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3385 Type currentTarget = targetInfo.target;
3386 Type desc = targetInfo.descriptor;
3387
3388 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3389 List<Type> argtypes = desc.getParameterTypes();
3390 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3391
3392 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3393 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3394 }
3395
3396 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3397 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3398 try {
3399 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3400 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3401 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3402 } finally {
3403 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3404 }
3405
3406 Symbol refSym = refResult.fst;
3407 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3408
3409 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3410 * JDK-8075541
3411 */
3412 if (refSym.kind != MTH) {
3413 boolean targetError;
3414 switch (refSym.kind) {
3415 case ABSENT_MTH:
3416 case MISSING_ENCL:
3417 targetError = false;
3418 break;
3419 case WRONG_MTH:
3420 case WRONG_MTHS:
3421 case AMBIGUOUS:
3422 case HIDDEN:
3423 case STATICERR:
3424 targetError = true;
3425 break;
3426 default:
3427 Assert.error("unexpected result kind " + refSym.kind);
3428 targetError = false;
3429 }
3430
3431 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3432 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3433 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3434
3435 JCDiagnostic diag = diags.create(log.currentSource(), that,
3436 targetError ?
3437 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3438 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3439
3440 if (targetError && currentTarget == Type.recoveryType) {
3441 //a target error doesn't make sense during recovery stage
3442 //as we don't know what actual parameter types are
3443 result = that.type = currentTarget;
3444 return;
3445 } else {
3446 if (targetError) {
3447 resultInfo.checkContext.report(that, diag);
3448 } else {
3449 log.report(diag);
3450 }
3451 result = that.type = types.createErrorType(currentTarget);
3452 return;
3453 }
3454 }
3455
3456 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3457 that.kind = lookupHelper.referenceKind(that.sym);
3458 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3459
3460 if (desc.getReturnType() == Type.recoveryType) {
3461 // stop here
3462 result = that.type = currentTarget;
3463 return;
3464 }
3465
3466 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3467 Type enclosingType = exprType.getEnclosingType();
3468 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3469 // Check for the existence of an apropriate outer instance
3470 rs.resolveImplicitThis(that.pos(), env, exprType);
3471 }
3472 }
3473
3474 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3475
3476 if (that.getMode() == ReferenceMode.INVOKE &&
3477 TreeInfo.isStaticSelector(that.expr, names) &&
3478 that.kind.isUnbound() &&
3479 lookupHelper.site.isRaw()) {
3480 chk.checkRaw(that.expr, localEnv);
3481 }
3482
3483 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3484 exprType.getTypeArguments().nonEmpty()) {
3485 //static ref with class type-args
3486 log.error(that.expr.pos(),
3487 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3488 Fragments.StaticMrefWithTargs));
3489 result = that.type = types.createErrorType(currentTarget);
3490 return;
3491 }
3492
3493 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3494 // Check that super-qualified symbols are not abstract (JLS)
3495 rs.checkNonAbstract(that.pos(), that.sym);
3496 }
3497
3498 if (isTargetSerializable) {
3499 chk.checkAccessFromSerializableElement(that, true);
3500 }
3501 }
3502
3503 ResultInfo checkInfo =
3504 resultInfo.dup(newMethodTemplate(
3505 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3506 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3507 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3508
3509 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3510
3511 if (that.kind.isUnbound() &&
3512 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3513 //re-generate inference constraints for unbound receiver
3514 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3515 //cannot happen as this has already been checked - we just need
3516 //to regenerate the inference constraints, as that has been lost
3517 //as a result of the call to inferenceContext.save()
3518 Assert.error("Can't get here");
3519 }
3520 }
3521
3522 if (!refType.isErroneous()) {
3523 refType = types.createMethodTypeWithReturn(refType,
3524 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3525 }
3526
3527 //go ahead with standard method reference compatibility check - note that param check
3528 //is a no-op (as this has been taken care during method applicability)
3529 boolean isSpeculativeRound =
3530 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3531
3532 that.type = currentTarget; //avoids recovery at this stage
3533 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3534 if (!isSpeculativeRound) {
3535 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3536 }
3537 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3538 } catch (Types.FunctionDescriptorLookupError ex) {
3539 JCDiagnostic cause = ex.getDiagnostic();
3540 resultInfo.checkContext.report(that, cause);
3541 result = that.type = types.createErrorType(pt());
3542 return;
3543 }
3544 }
3545 //where
3546 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3547 //if this is a constructor reference, the expected kind must be a type
3548 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3549 KindSelector.VAL_TYP : KindSelector.TYP,
3550 Type.noType);
3551 }
3552
3553
3554 @SuppressWarnings("fallthrough")
3555 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3556 InferenceContext inferenceContext = checkContext.inferenceContext();
3557 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3558
3559 Type resType;
3560 switch (tree.getMode()) {
3561 case NEW:
3562 if (!tree.expr.type.isRaw()) {
3563 resType = tree.expr.type;
3564 break;
3565 }
3566 default:
3567 resType = refType.getReturnType();
3568 }
3569
3570 Type incompatibleReturnType = resType;
3571
3572 if (returnType.hasTag(VOID)) {
3573 incompatibleReturnType = null;
3574 }
3575
3576 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3577 if (resType.isErroneous() ||
3578 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3579 checkContext.checkWarner(tree, resType, returnType))) {
3580 incompatibleReturnType = null;
3581 }
3582 }
3583
3584 if (incompatibleReturnType != null) {
3585 Fragment msg =
3586 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3587 checkContext.report(tree, diags.fragment(msg));
3588 } else {
3589 if (inferenceContext.free(refType)) {
3590 // we need to wait for inference to finish and then replace inference vars in the referent type
3591 inferenceContext.addFreeTypeListener(List.of(refType),
3592 instantiatedContext -> {
3593 tree.referentType = instantiatedContext.asInstType(refType);
3594 });
3595 } else {
3596 tree.referentType = refType;
3597 }
3598 }
3599
3600 if (!speculativeAttr) {
3601 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3602 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3603 }
3604 }
3605 }
3606
3607 boolean checkExConstraints(
3608 List<Type> thrownByFuncExpr,
3609 List<Type> thrownAtFuncType,
3610 InferenceContext inferenceContext) {
3611 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3612 * are not proper types
3613 */
3614 List<Type> nonProperList = thrownAtFuncType.stream()
3615 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3616 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3617
3618 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3619 * in the throws clause of the invocation type of the method reference's compile-time
3620 * declaration
3621 */
3622 List<Type> checkedList = thrownByFuncExpr.stream()
3623 .filter(e -> chk.isChecked(e)).collect(List.collector());
3624
3625 /** If n = 0 (the function type's throws clause consists only of proper types), then
3626 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3627 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3628 * reduces to true
3629 */
3630 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3631 for (Type checked : checkedList) {
3632 boolean isSubtype = false;
3633 for (Type proper : properList) {
3634 if (types.isSubtype(checked, proper)) {
3635 isSubtype = true;
3636 break;
3637 }
3638 }
3639 if (!isSubtype) {
3640 uncaughtByProperTypes.add(checked);
3641 }
3642 }
3643
3644 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3645 return false;
3646 }
3647
3648 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3649 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3650 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3651 */
3652 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3653 uncaughtByProperTypes.forEach(checkedEx -> {
3654 nonProperAsUndet.forEach(nonProper -> {
3655 types.isSubtype(checkedEx, nonProper);
3656 });
3657 });
3658
3659 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3660 */
3661 nonProperAsUndet.stream()
3662 .filter(t -> t.hasTag(UNDETVAR))
3663 .forEach(t -> ((UndetVar)t).setThrow());
3664 return true;
3665 }
3666
3667 /**
3668 * Set functional type info on the underlying AST. Note: as the target descriptor
3669 * might contain inference variables, we might need to register an hook in the
3670 * current inference context.
3671 */
3672 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3673 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3674 if (checkContext.inferenceContext().free(descriptorType)) {
3675 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3676 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3677 inferenceContext.asInstType(primaryTarget), checkContext));
3678 } else {
3679 if (pt.hasTag(CLASS)) {
3680 fExpr.target = primaryTarget;
3681 }
3682 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3683 pt != Type.recoveryType) {
3684 //check that functional interface class is well-formed
3685 try {
3686 /* Types.makeFunctionalInterfaceClass() may throw an exception
3687 * when it's executed post-inference. See the listener code
3688 * above.
3689 */
3690 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3691 names.empty, fExpr.target, ABSTRACT);
3692 if (csym != null) {
3693 chk.checkImplementations(env.tree, csym, csym);
3694 try {
3695 //perform an additional functional interface check on the synthetic class,
3696 //as there may be spurious errors for raw targets - because of existing issues
3697 //with membership and inheritance (see JDK-8074570).
3698 csym.flags_field |= INTERFACE;
3699 types.findDescriptorType(csym.type);
3700 } catch (FunctionDescriptorLookupError err) {
3701 resultInfo.checkContext.report(fExpr,
3702 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3703 }
3704 }
3705 } catch (Types.FunctionDescriptorLookupError ex) {
3706 JCDiagnostic cause = ex.getDiagnostic();
3707 resultInfo.checkContext.report(env.tree, cause);
3708 }
3709 }
3710 }
3711 }
3712
3713 public void visitParens(JCParens tree) {
3714 Type owntype = attribTree(tree.expr, env, resultInfo);
3715 result = check(tree, owntype, pkind(), resultInfo);
3716 Symbol sym = TreeInfo.symbol(tree);
3717 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK))
3718 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3719 }
3720
3721 public void visitAssign(JCAssign tree) {
3722 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3723 Type capturedType = capture(owntype);
3724 attribExpr(tree.rhs, env, owntype);
3725 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3726 }
3727
3728 public void visitAssignop(JCAssignOp tree) {
3729 // Attribute arguments.
3730 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3731 Type operand = attribExpr(tree.rhs, env);
3732 // Find operator.
3733 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3734 if (operator != operators.noOpSymbol &&
3735 !owntype.isErroneous() &&
3736 !operand.isErroneous()) {
3737 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3738 chk.checkCastable(tree.rhs.pos(),
3739 operator.type.getReturnType(),
3740 owntype);
3741 }
3742 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3743 }
3744
3745 public void visitUnary(JCUnary tree) {
3746 // Attribute arguments.
3747 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3748 ? attribTree(tree.arg, env, varAssignmentInfo)
3749 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3750
3751 // Find operator.
3752 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3753 Type owntype = types.createErrorType(tree.type);
3754 if (operator != operators.noOpSymbol &&
3755 !argtype.isErroneous()) {
3756 owntype = (tree.getTag().isIncOrDecUnaryOp())
3757 ? tree.arg.type
3758 : operator.type.getReturnType();
3759 int opc = ((OperatorSymbol)operator).opcode;
3760
3761 // If the argument is constant, fold it.
3762 if (argtype.constValue() != null) {
3763 Type ctype = cfolder.fold1(opc, argtype);
3764 if (ctype != null) {
3765 owntype = cfolder.coerce(ctype, owntype);
3766 }
3767 }
3768 }
3769 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3770 }
3771
3772 public void visitBinary(JCBinary tree) {
3773 // Attribute arguments.
3774 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3775 // x && y
3776 // include x's bindings when true in y
3777
3778 // x || y
3779 // include x's bindings when false in y
3780
3781 List<BindingSymbol> matchBindings;
3782 switch (tree.getTag()) {
3783 case AND:
3784 matchBindings = matchBindingsComputer.getMatchBindings(tree.lhs, true);
3785 break;
3786 case OR:
3787 matchBindings = matchBindingsComputer.getMatchBindings(tree.lhs, false);
3788 break;
3789 default:
3790 matchBindings = List.nil();
3791 break;
3792 }
3793 Env<AttrContext> rhsEnv = bindingEnv(env, matchBindings);
3794 Type right;
3795 try {
3796 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
3797 } finally {
3798 rhsEnv.info.scope.leave();
3799 }
3800
3801 // Find operator.
3802 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
3803 Type owntype = types.createErrorType(tree.type);
3804 if (operator != operators.noOpSymbol &&
3805 !left.isErroneous() &&
3806 !right.isErroneous()) {
3807 owntype = operator.type.getReturnType();
3808 int opc = ((OperatorSymbol)operator).opcode;
3809 // If both arguments are constants, fold them.
3810 if (left.constValue() != null && right.constValue() != null) {
3811 Type ctype = cfolder.fold2(opc, left, right);
3812 if (ctype != null) {
3813 owntype = cfolder.coerce(ctype, owntype);
3814 }
3815 }
3816
3817 // Check that argument types of a reference ==, != are
3818 // castable to each other, (JLS 15.21). Note: unboxing
3819 // comparisons will not have an acmp* opc at this point.
3820 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3821 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
3822 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
3823 }
3824 }
3825
3826 chk.checkDivZero(tree.rhs.pos(), operator, right);
3827 }
3828 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3829 }
3830
3831 public void visitTypeCast(final JCTypeCast tree) {
3832 Type clazztype = attribType(tree.clazz, env);
3833 chk.validate(tree.clazz, env, false);
3834 //a fresh environment is required for 292 inference to work properly ---
3835 //see Infer.instantiatePolymorphicSignatureInstance()
3836 Env<AttrContext> localEnv = env.dup(tree);
3837 //should we propagate the target type?
3838 final ResultInfo castInfo;
3839 JCExpression expr = TreeInfo.skipParens(tree.expr);
3840 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3841 if (isPoly) {
3842 //expression is a poly - we need to propagate target type info
3843 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
3844 new Check.NestedCheckContext(resultInfo.checkContext) {
3845 @Override
3846 public boolean compatible(Type found, Type req, Warner warn) {
3847 return types.isCastable(found, req, warn);
3848 }
3849 });
3850 } else {
3851 //standalone cast - target-type info is not propagated
3852 castInfo = unknownExprInfo;
3853 }
3854 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3855 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3856 if (exprtype.constValue() != null)
3857 owntype = cfolder.coerce(exprtype, owntype);
3858 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
3859 if (!isPoly)
3860 chk.checkRedundantCast(localEnv, tree);
3861 }
3862
3863 public void visitTypeTest(JCInstanceOf tree) {
3864 Type exprtype = chk.checkNullOrRefType(
3865 tree.expr.pos(), attribExpr(tree.expr, env));
3866 Type clazztype;
3867 JCTree typeTree;
3868 if (tree.pattern.getTag() == BINDINGPATTERN) {
3869 attribTree(tree.pattern, env, unknownExprInfo);
3870 clazztype = tree.pattern.type;
3871 JCBindingPattern pattern = (JCBindingPattern) tree.pattern;
3872 typeTree = pattern.vartype;
3873 if (!clazztype.hasTag(TYPEVAR)) {
3874 clazztype = chk.checkClassOrArrayType(pattern.vartype.pos(), clazztype);
3875 }
3876 } else {
3877 clazztype = attribType(tree.pattern, env);
3878 typeTree = tree.pattern;
3879 }
3880 if (!clazztype.hasTag(TYPEVAR)) {
3881 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
3882 }
3883 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3884 boolean valid = false;
3885 if (allowReifiableTypesInInstanceof) {
3886 if (preview.isPreview(Feature.REIFIABLE_TYPES_INSTANCEOF)) {
3887 preview.warnPreview(tree.expr.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF);
3888 }
3889 Warner warner = new Warner();
3890 if (!types.isCastable(exprtype, clazztype, warner)) {
3891 chk.basicHandler.report(tree.expr.pos(),
3892 diags.fragment(Fragments.InconvertibleTypes(exprtype, clazztype)));
3893 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
3894 log.error(tree.expr.pos(),
3895 Errors.InstanceofReifiableNotSafe(exprtype, clazztype));
3896 } else {
3897 valid = true;
3898 }
3899 } else {
3900 log.error(typeTree.pos(), Errors.IllegalGenericTypeForInstof);
3901 }
3902 if (!valid) {
3903 clazztype = types.createErrorType(clazztype);
3904 }
3905 }
3906 chk.validate(typeTree, env, false);
3907 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3908 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
3909 }
3910
3911 public void visitBindingPattern(JCBindingPattern tree) {
3912 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
3913 tree.type = attribTree(tree.vartype, env, varInfo);
3914 VarSymbol v = tree.symbol = new BindingSymbol(tree.name, tree.vartype.type, env.info.scope.owner);
3915 if (chk.checkUnique(tree.pos(), v, env.info.scope)) {
3916 chk.checkTransparentVar(tree.pos(), v, env.info.scope);
3917 }
3918 annotate.queueScanTreeAndTypeAnnotate(tree.vartype, env, v, tree.pos());
3919 annotate.flush();
3920 result = tree.type;
3921 }
3922
3923 public void visitIndexed(JCArrayAccess tree) {
3924 Type owntype = types.createErrorType(tree.type);
3925 Type atype = attribExpr(tree.indexed, env);
3926 attribExpr(tree.index, env, syms.intType);
3927 if (types.isArray(atype))
3928 owntype = types.elemtype(atype);
3929 else if (!atype.hasTag(ERROR))
3930 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
3931 if (!pkind().contains(KindSelector.VAL))
3932 owntype = capture(owntype);
3933 result = check(tree, owntype, KindSelector.VAR, resultInfo);
3934 }
3935
3936 public void visitIdent(JCIdent tree) {
3937 Symbol sym;
3938
3939 // Find symbol
3940 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3941 // If we are looking for a method, the prototype `pt' will be a
3942 // method type with the type of the call's arguments as parameters.
3943 env.info.pendingResolutionPhase = null;
3944 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3945 } else if (tree.sym != null && tree.sym.kind != VAR) {
3946 sym = tree.sym;
3947 } else {
3948 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3949 }
3950 tree.sym = sym;
3951
3952 // (1) Also find the environment current for the class where
3953 // sym is defined (`symEnv').
3954 // Only for pre-tiger versions (1.4 and earlier):
3955 // (2) Also determine whether we access symbol out of an anonymous
3956 // class in a this or super call. This is illegal for instance
3957 // members since such classes don't carry a this$n link.
3958 // (`noOuterThisPath').
3959 Env<AttrContext> symEnv = env;
3960 boolean noOuterThisPath = false;
3961 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3962 sym.kind.matches(KindSelector.VAL_MTH) &&
3963 sym.owner.kind == TYP &&
3964 tree.name != names._this && tree.name != names._super) {
3965
3966 // Find environment in which identifier is defined.
3967 while (symEnv.outer != null &&
3968 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3969 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3970 noOuterThisPath = false;
3971 symEnv = symEnv.outer;
3972 }
3973 }
3974
3975 // If symbol is a variable, ...
3976 if (sym.kind == VAR) {
3977 VarSymbol v = (VarSymbol)sym;
3978
3979 // ..., evaluate its initializer, if it has one, and check for
3980 // illegal forward reference.
3981 checkInit(tree, env, v, false);
3982
3983 // If we are expecting a variable (as opposed to a value), check
3984 // that the variable is assignable in the current environment.
3985 if (KindSelector.ASG.subset(pkind()))
3986 checkAssignable(tree.pos(), v, null, env);
3987 }
3988
3989 // In a constructor body,
3990 // if symbol is a field or instance method, check that it is
3991 // not accessed before the supertype constructor is called.
3992 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3993 sym.kind.matches(KindSelector.VAL_MTH) &&
3994 sym.owner.kind == TYP &&
3995 (sym.flags() & STATIC) == 0) {
3996 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
3997 sym : thisSym(tree.pos(), env));
3998 }
3999 Env<AttrContext> env1 = env;
4000 if (sym.kind != ERR && sym.kind != TYP &&
4001 sym.owner != null && sym.owner != env1.enclClass.sym) {
4002 // If the found symbol is inaccessible, then it is
4003 // accessed through an enclosing instance. Locate this
4004 // enclosing instance:
4005 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4006 env1 = env1.outer;
4007 }
4008
4009 if (env.info.isSerializable) {
4010 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4011 }
4012
4013 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4014 }
4015
4016 public void visitSelect(JCFieldAccess tree) {
4017 // Determine the expected kind of the qualifier expression.
4018 KindSelector skind = KindSelector.NIL;
4019 if (tree.name == names._this || tree.name == names._super ||
4020 tree.name == names._class)
4021 {
4022 skind = KindSelector.TYP;
4023 } else {
4024 if (pkind().contains(KindSelector.PCK))
4025 skind = KindSelector.of(skind, KindSelector.PCK);
4026 if (pkind().contains(KindSelector.TYP))
4027 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4028 if (pkind().contains(KindSelector.VAL_MTH))
4029 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4030 }
4031
4032 // Attribute the qualifier expression, and determine its symbol (if any).
4033 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4034 if (!pkind().contains(KindSelector.TYP_PCK))
4035 site = capture(site); // Capture field access
4036
4037 // don't allow T.class T[].class, etc
4038 if (skind == KindSelector.TYP) {
4039 Type elt = site;
4040 while (elt.hasTag(ARRAY))
4041 elt = ((ArrayType)elt).elemtype;
4042 if (elt.hasTag(TYPEVAR)) {
4043 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4044 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4045 tree.sym = tree.type.tsym;
4046 return ;
4047 }
4048 }
4049
4050 // If qualifier symbol is a type or `super', assert `selectSuper'
4051 // for the selection. This is relevant for determining whether
4052 // protected symbols are accessible.
4053 Symbol sitesym = TreeInfo.symbol(tree.selected);
4054 boolean selectSuperPrev = env.info.selectSuper;
4055 env.info.selectSuper =
4056 sitesym != null &&
4057 sitesym.name == names._super;
4058
4059 // Determine the symbol represented by the selection.
4060 env.info.pendingResolutionPhase = null;
4061 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4062 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4063 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4064 sym = syms.errSymbol;
4065 }
4066 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4067 site = capture(site);
4068 sym = selectSym(tree, sitesym, site, env, resultInfo);
4069 }
4070 boolean varArgs = env.info.lastResolveVarargs();
4071 tree.sym = sym;
4072
4073 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4074 site = types.skipTypeVars(site, true);
4075 }
4076
4077 // If that symbol is a variable, ...
4078 if (sym.kind == VAR) {
4079 VarSymbol v = (VarSymbol)sym;
4080
4081 // ..., evaluate its initializer, if it has one, and check for
4082 // illegal forward reference.
4083 checkInit(tree, env, v, true);
4084
4085 // If we are expecting a variable (as opposed to a value), check
4086 // that the variable is assignable in the current environment.
4087 if (KindSelector.ASG.subset(pkind()))
4088 checkAssignable(tree.pos(), v, tree.selected, env);
4089 }
4090
4091 if (sitesym != null &&
4092 sitesym.kind == VAR &&
4093 ((VarSymbol)sitesym).isResourceVariable() &&
4094 sym.kind == MTH &&
4095 sym.name.equals(names.close) &&
4096 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4097 env.info.lint.isEnabled(LintCategory.TRY)) {
4098 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4099 }
4100
4101 // Disallow selecting a type from an expression
4102 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4103 tree.type = check(tree.selected, pt(),
4104 sitesym == null ?
4105 KindSelector.VAL : sitesym.kind.toSelector(),
4106 new ResultInfo(KindSelector.TYP_PCK, pt()));
4107 }
4108
4109 if (isType(sitesym)) {
4110 if (sym.name == names._this) {
4111 // If `C' is the currently compiled class, check that
4112 // C.this' does not appear in a call to a super(...)
4113 if (env.info.isSelfCall &&
4114 site.tsym == env.enclClass.sym) {
4115 chk.earlyRefError(tree.pos(), sym);
4116 }
4117 } else {
4118 // Check if type-qualified fields or methods are static (JLS)
4119 if ((sym.flags() & STATIC) == 0 &&
4120 sym.name != names._super &&
4121 (sym.kind == VAR || sym.kind == MTH)) {
4122 rs.accessBase(rs.new StaticError(sym),
4123 tree.pos(), site, sym.name, true);
4124 }
4125 }
4126 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
4127 sym.isStatic() && sym.kind == MTH) {
4128 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
4129 }
4130 } else if (sym.kind != ERR &&
4131 (sym.flags() & STATIC) != 0 &&
4132 sym.name != names._class) {
4133 // If the qualified item is not a type and the selected item is static, report
4134 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4135 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4136 }
4137
4138 // If we are selecting an instance member via a `super', ...
4139 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4140
4141 // Check that super-qualified symbols are not abstract (JLS)
4142 rs.checkNonAbstract(tree.pos(), sym);
4143
4144 if (site.isRaw()) {
4145 // Determine argument types for site.
4146 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4147 if (site1 != null) site = site1;
4148 }
4149 }
4150
4151 if (env.info.isSerializable) {
4152 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4153 }
4154
4155 env.info.selectSuper = selectSuperPrev;
4156 result = checkId(tree, site, sym, env, resultInfo);
4157 }
4158 //where
4159 /** Determine symbol referenced by a Select expression,
4160 *
4161 * @param tree The select tree.
4162 * @param site The type of the selected expression,
4163 * @param env The current environment.
4164 * @param resultInfo The current result.
4165 */
4166 private Symbol selectSym(JCFieldAccess tree,
4167 Symbol location,
4168 Type site,
4169 Env<AttrContext> env,
4170 ResultInfo resultInfo) {
4171 DiagnosticPosition pos = tree.pos();
4172 Name name = tree.name;
4173 switch (site.getTag()) {
4174 case PACKAGE:
4175 return rs.accessBase(
4176 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4177 pos, location, site, name, true);
4178 case ARRAY:
4179 case CLASS:
4180 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4181 return rs.resolveQualifiedMethod(
4182 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4183 } else if (name == names._this || name == names._super) {
4184 return rs.resolveSelf(pos, env, site.tsym, name);
4185 } else if (name == names._class) {
4186 // In this case, we have already made sure in
4187 // visitSelect that qualifier expression is a type.
4188 return syms.getClassField(site, types);
4189 } else {
4190 // We are seeing a plain identifier as selector.
4191 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4192 sym = rs.accessBase(sym, pos, location, site, name, true);
4193 return sym;
4194 }
4195 case WILDCARD:
4196 throw new AssertionError(tree);
4197 case TYPEVAR:
4198 // Normally, site.getUpperBound() shouldn't be null.
4199 // It should only happen during memberEnter/attribBase
4200 // when determining the super type which *must* beac
4201 // done before attributing the type variables. In
4202 // other words, we are seeing this illegal program:
4203 // class B<T> extends A<T.foo> {}
4204 Symbol sym = (site.getUpperBound() != null)
4205 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4206 : null;
4207 if (sym == null) {
4208 log.error(pos, Errors.TypeVarCantBeDeref);
4209 return syms.errSymbol;
4210 } else {
4211 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4212 rs.new AccessError(env, site, sym) :
4213 sym;
4214 rs.accessBase(sym2, pos, location, site, name, true);
4215 return sym;
4216 }
4217 case ERROR:
4218 // preserve identifier names through errors
4219 return types.createErrorType(name, site.tsym, site).tsym;
4220 default:
4221 // The qualifier expression is of a primitive type -- only
4222 // .class is allowed for these.
4223 if (name == names._class) {
4224 // In this case, we have already made sure in Select that
4225 // qualifier expression is a type.
4226 return syms.getClassField(site, types);
4227 } else {
4228 log.error(pos, Errors.CantDeref(site));
4229 return syms.errSymbol;
4230 }
4231 }
4232 }
4233
4234 /** Determine type of identifier or select expression and check that
4235 * (1) the referenced symbol is not deprecated
4236 * (2) the symbol's type is safe (@see checkSafe)
4237 * (3) if symbol is a variable, check that its type and kind are
4238 * compatible with the prototype and protokind.
4239 * (4) if symbol is an instance field of a raw type,
4240 * which is being assigned to, issue an unchecked warning if its
4241 * type changes under erasure.
4242 * (5) if symbol is an instance method of a raw type, issue an
4243 * unchecked warning if its argument types change under erasure.
4244 * If checks succeed:
4245 * If symbol is a constant, return its constant type
4246 * else if symbol is a method, return its result type
4247 * otherwise return its type.
4248 * Otherwise return errType.
4249 *
4250 * @param tree The syntax tree representing the identifier
4251 * @param site If this is a select, the type of the selected
4252 * expression, otherwise the type of the current class.
4253 * @param sym The symbol representing the identifier.
4254 * @param env The current environment.
4255 * @param resultInfo The expected result
4256 */
4257 Type checkId(JCTree tree,
4258 Type site,
4259 Symbol sym,
4260 Env<AttrContext> env,
4261 ResultInfo resultInfo) {
4262 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4263 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4264 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4265 }
4266
4267 Type checkMethodIdInternal(JCTree tree,
4268 Type site,
4269 Symbol sym,
4270 Env<AttrContext> env,
4271 ResultInfo resultInfo) {
4272 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4273 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
4274 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
4275 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4276 return owntype;
4277 } else {
4278 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4279 }
4280 }
4281
4282 Type checkIdInternal(JCTree tree,
4283 Type site,
4284 Symbol sym,
4285 Type pt,
4286 Env<AttrContext> env,
4287 ResultInfo resultInfo) {
4288 if (pt.isErroneous()) {
4289 return types.createErrorType(site);
4290 }
4291 Type owntype; // The computed type of this identifier occurrence.
4292 switch (sym.kind) {
4293 case TYP:
4294 // For types, the computed type equals the symbol's type,
4295 // except for two situations:
4296 owntype = sym.type;
4297 if (owntype.hasTag(CLASS)) {
4298 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4299 Type ownOuter = owntype.getEnclosingType();
4300
4301 // (a) If the symbol's type is parameterized, erase it
4302 // because no type parameters were given.
4303 // We recover generic outer type later in visitTypeApply.
4304 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4305 owntype = types.erasure(owntype);
4306 }
4307
4308 // (b) If the symbol's type is an inner class, then
4309 // we have to interpret its outer type as a superclass
4310 // of the site type. Example:
4311 //
4312 // class Tree<A> { class Visitor { ... } }
4313 // class PointTree extends Tree<Point> { ... }
4314 // ...PointTree.Visitor...
4315 //
4316 // Then the type of the last expression above is
4317 // Tree<Point>.Visitor.
4318 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4319 Type normOuter = site;
4320 if (normOuter.hasTag(CLASS)) {
4321 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4322 }
4323 if (normOuter == null) // perhaps from an import
4324 normOuter = types.erasure(ownOuter);
4325 if (normOuter != ownOuter)
4326 owntype = new ClassType(
4327 normOuter, List.nil(), owntype.tsym,
4328 owntype.getMetadata());
4329 }
4330 }
4331 break;
4332 case VAR:
4333 VarSymbol v = (VarSymbol)sym;
4334
4335 if (env.info.enclVar != null
4336 && v.type.hasTag(NONE)) {
4337 //self reference to implicitly typed variable declaration
4338 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4339 return v.type = types.createErrorType(v.type);
4340 }
4341
4342 // Test (4): if symbol is an instance field of a raw type,
4343 // which is being assigned to, issue an unchecked warning if
4344 // its type changes under erasure.
4345 if (KindSelector.ASG.subset(pkind()) &&
4346 v.owner.kind == TYP &&
4347 (v.flags() & STATIC) == 0 &&
4348 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4349 Type s = types.asOuterSuper(site, v.owner);
4350 if (s != null &&
4351 s.isRaw() &&
4352 !types.isSameType(v.type, v.erasure(types))) {
4353 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4354 }
4355 }
4356 // The computed type of a variable is the type of the
4357 // variable symbol, taken as a member of the site type.
4358 owntype = (sym.owner.kind == TYP &&
4359 sym.name != names._this && sym.name != names._super)
4360 ? types.memberType(site, sym)
4361 : sym.type;
4362
4363 // If the variable is a constant, record constant value in
4364 // computed type.
4365 if (v.getConstValue() != null && isStaticReference(tree))
4366 owntype = owntype.constType(v.getConstValue());
4367
4368 if (resultInfo.pkind == KindSelector.VAL) {
4369 owntype = capture(owntype); // capture "names as expressions"
4370 }
4371 break;
4372 case MTH: {
4373 owntype = checkMethod(site, sym,
4374 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4375 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4376 resultInfo.pt.getTypeArguments());
4377 break;
4378 }
4379 case PCK: case ERR:
4380 owntype = sym.type;
4381 break;
4382 default:
4383 throw new AssertionError("unexpected kind: " + sym.kind +
4384 " in tree " + tree);
4385 }
4386
4387 // Emit a `deprecation' warning if symbol is deprecated.
4388 // (for constructors (but not for constructor references), the error
4389 // was given when the constructor was resolved)
4390
4391 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4392 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4393 chk.checkSunAPI(tree.pos(), sym);
4394 chk.checkProfile(tree.pos(), sym);
4395 chk.checkPreview(tree.pos(), sym);
4396 }
4397
4398 // If symbol is a variable, check that its type and
4399 // kind are compatible with the prototype and protokind.
4400 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4401 }
4402
4403 /** Check that variable is initialized and evaluate the variable's
4404 * initializer, if not yet done. Also check that variable is not
4405 * referenced before it is defined.
4406 * @param tree The tree making up the variable reference.
4407 * @param env The current environment.
4408 * @param v The variable's symbol.
4409 */
4410 private void checkInit(JCTree tree,
4411 Env<AttrContext> env,
4412 VarSymbol v,
4413 boolean onlyWarning) {
4414 // A forward reference is diagnosed if the declaration position
4415 // of the variable is greater than the current tree position
4416 // and the tree and variable definition occur in the same class
4417 // definition. Note that writes don't count as references.
4418 // This check applies only to class and instance
4419 // variables. Local variables follow different scope rules,
4420 // and are subject to definite assignment checking.
4421 Env<AttrContext> initEnv = enclosingInitEnv(env);
4422 if (initEnv != null &&
4423 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4424 v.owner.kind == TYP &&
4425 v.owner == env.info.scope.owner.enclClass() &&
4426 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4427 (!env.tree.hasTag(ASSIGN) ||
4428 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4429 if (!onlyWarning || isStaticEnumField(v)) {
4430 Error errkey = (initEnv.info.enclVar == v) ?
4431 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4432 log.error(tree.pos(), errkey);
4433 } else if (useBeforeDeclarationWarning) {
4434 Warning warnkey = (initEnv.info.enclVar == v) ?
4435 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4436 log.warning(tree.pos(), warnkey);
4437 }
4438 }
4439
4440 v.getConstValue(); // ensure initializer is evaluated
4441
4442 checkEnumInitializer(tree, env, v);
4443 }
4444
4445 /**
4446 * Returns the enclosing init environment associated with this env (if any). An init env
4447 * can be either a field declaration env or a static/instance initializer env.
4448 */
4449 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4450 while (true) {
4451 switch (env.tree.getTag()) {
4452 case VARDEF:
4453 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4454 if (vdecl.sym.owner.kind == TYP) {
4455 //field
4456 return env;
4457 }
4458 break;
4459 case BLOCK:
4460 if (env.next.tree.hasTag(CLASSDEF)) {
4461 //instance/static initializer
4462 return env;
4463 }
4464 break;
4465 case METHODDEF:
4466 case CLASSDEF:
4467 case TOPLEVEL:
4468 return null;
4469 }
4470 Assert.checkNonNull(env.next);
4471 env = env.next;
4472 }
4473 }
4474
4475 /**
4476 * Check for illegal references to static members of enum. In
4477 * an enum type, constructors and initializers may not
4478 * reference its static members unless they are constant.
4479 *
4480 * @param tree The tree making up the variable reference.
4481 * @param env The current environment.
4482 * @param v The variable's symbol.
4483 * @jls 8.9 Enum Types
4484 */
4485 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4486 // JLS:
4487 //
4488 // "It is a compile-time error to reference a static field
4489 // of an enum type that is not a compile-time constant
4490 // (15.28) from constructors, instance initializer blocks,
4491 // or instance variable initializer expressions of that
4492 // type. It is a compile-time error for the constructors,
4493 // instance initializer blocks, or instance variable
4494 // initializer expressions of an enum constant e to refer
4495 // to itself or to an enum constant of the same type that
4496 // is declared to the right of e."
4497 if (isStaticEnumField(v)) {
4498 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4499
4500 if (enclClass == null || enclClass.owner == null)
4501 return;
4502
4503 // See if the enclosing class is the enum (or a
4504 // subclass thereof) declaring v. If not, this
4505 // reference is OK.
4506 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4507 return;
4508
4509 // If the reference isn't from an initializer, then
4510 // the reference is OK.
4511 if (!Resolve.isInitializer(env))
4512 return;
4513
4514 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4515 }
4516 }
4517
4518 /** Is the given symbol a static, non-constant field of an Enum?
4519 * Note: enum literals should not be regarded as such
4520 */
4521 private boolean isStaticEnumField(VarSymbol v) {
4522 return Flags.isEnum(v.owner) &&
4523 Flags.isStatic(v) &&
4524 !Flags.isConstant(v) &&
4525 v.name != names._class;
4526 }
4527
4528 /**
4529 * Check that method arguments conform to its instantiation.
4530 **/
4531 public Type checkMethod(Type site,
4532 final Symbol sym,
4533 ResultInfo resultInfo,
4534 Env<AttrContext> env,
4535 final List<JCExpression> argtrees,
4536 List<Type> argtypes,
4537 List<Type> typeargtypes) {
4538 // Test (5): if symbol is an instance method of a raw type, issue
4539 // an unchecked warning if its argument types change under erasure.
4540 if ((sym.flags() & STATIC) == 0 &&
4541 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4542 Type s = types.asOuterSuper(site, sym.owner);
4543 if (s != null && s.isRaw() &&
4544 !types.isSameTypes(sym.type.getParameterTypes(),
4545 sym.erasure(types).getParameterTypes())) {
4546 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4547 }
4548 }
4549
4550 if (env.info.defaultSuperCallSite != null) {
4551 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4552 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4553 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4554 List<MethodSymbol> icand_sup =
4555 types.interfaceCandidates(sup, (MethodSymbol)sym);
4556 if (icand_sup.nonEmpty() &&
4557 icand_sup.head != sym &&
4558 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4559 log.error(env.tree.pos(),
4560 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4561 break;
4562 }
4563 }
4564 env.info.defaultSuperCallSite = null;
4565 }
4566
4567 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4568 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4569 if (app.meth.hasTag(SELECT) &&
4570 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4571 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4572 }
4573 }
4574
4575 // Compute the identifier's instantiated type.
4576 // For methods, we need to compute the instance type by
4577 // Resolve.instantiate from the symbol's type as well as
4578 // any type arguments and value arguments.
4579 Warner noteWarner = new Warner();
4580 try {
4581 Type owntype = rs.checkMethod(
4582 env,
4583 site,
4584 sym,
4585 resultInfo,
4586 argtypes,
4587 typeargtypes,
4588 noteWarner);
4589
4590 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4591 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4592
4593 argtypes = argtypes.map(checkDeferredMap);
4594
4595 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4596 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4597 sym.name,
4598 rs.methodArguments(sym.type.getParameterTypes()),
4599 rs.methodArguments(argtypes.map(checkDeferredMap)),
4600 kindName(sym.location()),
4601 sym.location()));
4602 if (resultInfo.pt != Infer.anyPoly ||
4603 !owntype.hasTag(METHOD) ||
4604 !owntype.isPartial()) {
4605 //if this is not a partially inferred method type, erase return type. Otherwise,
4606 //erasure is carried out in PartiallyInferredMethodType.check().
4607 owntype = new MethodType(owntype.getParameterTypes(),
4608 types.erasure(owntype.getReturnType()),
4609 types.erasure(owntype.getThrownTypes()),
4610 syms.methodClass);
4611 }
4612 }
4613
4614 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4615 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4616 PolyKind.POLY : PolyKind.STANDALONE;
4617 TreeInfo.setPolyKind(env.tree, pkind);
4618
4619 return (resultInfo.pt == Infer.anyPoly) ?
4620 owntype :
4621 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4622 resultInfo.checkContext.inferenceContext());
4623 } catch (Infer.InferenceException ex) {
4624 //invalid target type - propagate exception outwards or report error
4625 //depending on the current check context
4626 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4627 return types.createErrorType(site);
4628 } catch (Resolve.InapplicableMethodException ex) {
4629 final JCDiagnostic diag = ex.getDiagnostic();
4630 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4631 @Override
4632 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4633 return new Pair<>(sym, diag);
4634 }
4635 };
4636 List<Type> argtypes2 = argtypes.map(
4637 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4638 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4639 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4640 log.report(errDiag);
4641 return types.createErrorType(site);
4642 }
4643 }
4644
4645 public void visitLiteral(JCLiteral tree) {
4646 result = check(tree, litType(tree.typetag).constType(tree.value),
4647 KindSelector.VAL, resultInfo);
4648 }
4649 //where
4650 /** Return the type of a literal with given type tag.
4651 */
4652 Type litType(TypeTag tag) {
4653 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4654 }
4655
4656 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
4657 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
4658 }
4659
4660 public void visitTypeArray(JCArrayTypeTree tree) {
4661 Type etype = attribType(tree.elemtype, env);
4662 Type type = new ArrayType(etype, syms.arrayClass);
4663 result = check(tree, type, KindSelector.TYP, resultInfo);
4664 }
4665
4666 /** Visitor method for parameterized types.
4667 * Bound checking is left until later, since types are attributed
4668 * before supertype structure is completely known
4669 */
4670 public void visitTypeApply(JCTypeApply tree) {
4671 Type owntype = types.createErrorType(tree.type);
4672
4673 // Attribute functor part of application and make sure it's a class.
4674 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
4675
4676 // Attribute type parameters
4677 List<Type> actuals = attribTypes(tree.arguments, env);
4678
4679 if (clazztype.hasTag(CLASS)) {
4680 List<Type> formals = clazztype.tsym.type.getTypeArguments();
4681 if (actuals.isEmpty()) //diamond
4682 actuals = formals;
4683
4684 if (actuals.length() == formals.length()) {
4685 List<Type> a = actuals;
4686 List<Type> f = formals;
4687 while (a.nonEmpty()) {
4688 a.head = a.head.withTypeVar(f.head);
4689 a = a.tail;
4690 f = f.tail;
4691 }
4692 // Compute the proper generic outer
4693 Type clazzOuter = clazztype.getEnclosingType();
4694 if (clazzOuter.hasTag(CLASS)) {
4695 Type site;
4696 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
4697 if (clazz.hasTag(IDENT)) {
4698 site = env.enclClass.sym.type;
4699 } else if (clazz.hasTag(SELECT)) {
4700 site = ((JCFieldAccess) clazz).selected.type;
4701 } else throw new AssertionError(""+tree);
4702 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
4703 if (site.hasTag(CLASS))
4704 site = types.asOuterSuper(site, clazzOuter.tsym);
4705 if (site == null)
4706 site = types.erasure(clazzOuter);
4707 clazzOuter = site;
4708 }
4709 }
4710 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
4711 clazztype.getMetadata());
4712 } else {
4713 if (formals.length() != 0) {
4714 log.error(tree.pos(),
4715 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
4716 } else {
4717 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
4718 }
4719 owntype = types.createErrorType(tree.type);
4720 }
4721 }
4722 result = check(tree, owntype, KindSelector.TYP, resultInfo);
4723 }
4724
4725 public void visitTypeUnion(JCTypeUnion tree) {
4726 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
4727 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
4728 for (JCExpression typeTree : tree.alternatives) {
4729 Type ctype = attribType(typeTree, env);
4730 ctype = chk.checkType(typeTree.pos(),
4731 chk.checkClassType(typeTree.pos(), ctype),
4732 syms.throwableType);
4733 if (!ctype.isErroneous()) {
4734 //check that alternatives of a union type are pairwise
4735 //unrelated w.r.t. subtyping
4736 if (chk.intersects(ctype, multicatchTypes.toList())) {
4737 for (Type t : multicatchTypes) {
4738 boolean sub = types.isSubtype(ctype, t);
4739 boolean sup = types.isSubtype(t, ctype);
4740 if (sub || sup) {
4741 //assume 'a' <: 'b'
4742 Type a = sub ? ctype : t;
4743 Type b = sub ? t : ctype;
4744 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
4745 }
4746 }
4747 }
4748 multicatchTypes.append(ctype);
4749 if (all_multicatchTypes != null)
4750 all_multicatchTypes.append(ctype);
4751 } else {
4752 if (all_multicatchTypes == null) {
4753 all_multicatchTypes = new ListBuffer<>();
4754 all_multicatchTypes.appendList(multicatchTypes);
4755 }
4756 all_multicatchTypes.append(ctype);
4757 }
4758 }
4759 Type t = check(tree, types.lub(multicatchTypes.toList()),
4760 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
4761 if (t.hasTag(CLASS)) {
4762 List<Type> alternatives =
4763 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
4764 t = new UnionClassType((ClassType) t, alternatives);
4765 }
4766 tree.type = result = t;
4767 }
4768
4769 public void visitTypeIntersection(JCTypeIntersection tree) {
4770 attribTypes(tree.bounds, env);
4771 tree.type = result = checkIntersection(tree, tree.bounds);
4772 }
4773
4774 public void visitTypeParameter(JCTypeParameter tree) {
4775 TypeVar typeVar = (TypeVar) tree.type;
4776
4777 if (tree.annotations != null && tree.annotations.nonEmpty()) {
4778 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
4779 }
4780
4781 if (!typeVar.getUpperBound().isErroneous()) {
4782 //fixup type-parameter bound computed in 'attribTypeVariables'
4783 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
4784 }
4785 }
4786
4787 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
4788 Set<Type> boundSet = new HashSet<>();
4789 if (bounds.nonEmpty()) {
4790 // accept class or interface or typevar as first bound.
4791 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
4792 boundSet.add(types.erasure(bounds.head.type));
4793 if (bounds.head.type.isErroneous()) {
4794 return bounds.head.type;
4795 }
4796 else if (bounds.head.type.hasTag(TYPEVAR)) {
4797 // if first bound was a typevar, do not accept further bounds.
4798 if (bounds.tail.nonEmpty()) {
4799 log.error(bounds.tail.head.pos(),
4800 Errors.TypeVarMayNotBeFollowedByOtherBounds);
4801 return bounds.head.type;
4802 }
4803 } else {
4804 // if first bound was a class or interface, accept only interfaces
4805 // as further bounds.
4806 for (JCExpression bound : bounds.tail) {
4807 bound.type = checkBase(bound.type, bound, env, false, true, false);
4808 if (bound.type.isErroneous()) {
4809 bounds = List.of(bound);
4810 }
4811 else if (bound.type.hasTag(CLASS)) {
4812 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4813 }
4814 }
4815 }
4816 }
4817
4818 if (bounds.length() == 0) {
4819 return syms.objectType;
4820 } else if (bounds.length() == 1) {
4821 return bounds.head.type;
4822 } else {
4823 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
4824 // ... the variable's bound is a class type flagged COMPOUND
4825 // (see comment for TypeVar.bound).
4826 // In this case, generate a class tree that represents the
4827 // bound class, ...
4828 JCExpression extending;
4829 List<JCExpression> implementing;
4830 if (!bounds.head.type.isInterface()) {
4831 extending = bounds.head;
4832 implementing = bounds.tail;
4833 } else {
4834 extending = null;
4835 implementing = bounds;
4836 }
4837 JCClassDecl cd = make.at(tree).ClassDef(
4838 make.Modifiers(PUBLIC | ABSTRACT),
4839 names.empty, List.nil(),
4840 extending, implementing, List.nil());
4841
4842 ClassSymbol c = (ClassSymbol)owntype.tsym;
4843 Assert.check((c.flags() & COMPOUND) != 0);
4844 cd.sym = c;
4845 c.sourcefile = env.toplevel.sourcefile;
4846
4847 // ... and attribute the bound class
4848 c.flags_field |= UNATTRIBUTED;
4849 Env<AttrContext> cenv = enter.classEnv(cd, env);
4850 typeEnvs.put(c, cenv);
4851 attribClass(c);
4852 return owntype;
4853 }
4854 }
4855
4856 public void visitWildcard(JCWildcard tree) {
4857 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4858 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4859 ? syms.objectType
4860 : attribType(tree.inner, env);
4861 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4862 tree.kind.kind,
4863 syms.boundClass),
4864 KindSelector.TYP, resultInfo);
4865 }
4866
4867 public void visitAnnotation(JCAnnotation tree) {
4868 Assert.error("should be handled in annotate");
4869 }
4870
4871 public void visitAnnotatedType(JCAnnotatedType tree) {
4872 attribAnnotationTypes(tree.annotations, env);
4873 Type underlyingType = attribType(tree.underlyingType, env);
4874 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
4875
4876 if (!env.info.isNewClass)
4877 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
4878 result = tree.type = annotatedType;
4879 }
4880
4881 public void visitErroneous(JCErroneous tree) {
4882 if (tree.errs != null)
4883 for (JCTree err : tree.errs)
4884 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt()));
4885 result = tree.type = syms.errType;
4886 }
4887
4888 /** Default visitor method for all other trees.
4889 */
4890 public void visitTree(JCTree tree) {
4891 throw new AssertionError();
4892 }
4893
4894 /**
4895 * Attribute an env for either a top level tree or class or module declaration.
4896 */
4897 public void attrib(Env<AttrContext> env) {
4898 switch (env.tree.getTag()) {
4899 case MODULEDEF:
4900 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
4901 break;
4902 case TOPLEVEL:
4903 attribTopLevel(env);
4904 break;
4905 case PACKAGEDEF:
4906 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
4907 break;
4908 default:
4909 attribClass(env.tree.pos(), env.enclClass.sym);
4910 }
4911 }
4912
4913 /**
4914 * Attribute a top level tree. These trees are encountered when the
4915 * package declaration has annotations.
4916 */
4917 public void attribTopLevel(Env<AttrContext> env) {
4918 JCCompilationUnit toplevel = env.toplevel;
4919 try {
4920 annotate.flush();
4921 } catch (CompletionFailure ex) {
4922 chk.completionError(toplevel.pos(), ex);
4923 }
4924 }
4925
4926 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
4927 try {
4928 annotate.flush();
4929 attribPackage(p);
4930 } catch (CompletionFailure ex) {
4931 chk.completionError(pos, ex);
4932 }
4933 }
4934
4935 void attribPackage(PackageSymbol p) {
4936 Env<AttrContext> env = typeEnvs.get(p);
4937 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
4938 }
4939
4940 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
4941 try {
4942 annotate.flush();
4943 attribModule(m);
4944 } catch (CompletionFailure ex) {
4945 chk.completionError(pos, ex);
4946 }
4947 }
4948
4949 void attribModule(ModuleSymbol m) {
4950 // Get environment current at the point of module definition.
4951 Env<AttrContext> env = enter.typeEnvs.get(m);
4952 attribStat(env.tree, env);
4953 }
4954
4955 /** Main method: attribute class definition associated with given class symbol.
4956 * reporting completion failures at the given position.
4957 * @param pos The source position at which completion errors are to be
4958 * reported.
4959 * @param c The class symbol whose definition will be attributed.
4960 */
4961 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4962 try {
4963 annotate.flush();
4964 attribClass(c);
4965 } catch (CompletionFailure ex) {
4966 chk.completionError(pos, ex);
4967 }
4968 }
4969
4970 /** Attribute class definition associated with given class symbol.
4971 * @param c The class symbol whose definition will be attributed.
4972 */
4973 void attribClass(ClassSymbol c) throws CompletionFailure {
4974 if (c.type.hasTag(ERROR)) return;
4975
4976 // Check for cycles in the inheritance graph, which can arise from
4977 // ill-formed class files.
4978 chk.checkNonCyclic(null, c.type);
4979
4980 Type st = types.supertype(c.type);
4981 if ((c.flags_field & Flags.COMPOUND) == 0) {
4982 // First, attribute superclass.
4983 if (st.hasTag(CLASS))
4984 attribClass((ClassSymbol)st.tsym);
4985
4986 // Next attribute owner, if it is a class.
4987 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4988 attribClass((ClassSymbol)c.owner);
4989 }
4990
4991 // The previous operations might have attributed the current class
4992 // if there was a cycle. So we test first whether the class is still
4993 // UNATTRIBUTED.
4994 if ((c.flags_field & UNATTRIBUTED) != 0) {
4995 c.flags_field &= ~UNATTRIBUTED;
4996
4997 // Get environment current at the point of class definition.
4998 Env<AttrContext> env = typeEnvs.get(c);
4999
5000 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5001 // because the annotations were not available at the time the env was created. Therefore,
5002 // we look up the environment chain for the first enclosing environment for which the
5003 // lint value is set. Typically, this is the parent env, but might be further if there
5004 // are any envs created as a result of TypeParameter nodes.
5005 Env<AttrContext> lintEnv = env;
5006 while (lintEnv.info.lint == null)
5007 lintEnv = lintEnv.next;
5008
5009 // Having found the enclosing lint value, we can initialize the lint value for this class
5010 env.info.lint = lintEnv.info.lint.augment(c);
5011
5012 Lint prevLint = chk.setLint(env.info.lint);
5013 JavaFileObject prev = log.useSource(c.sourcefile);
5014 ResultInfo prevReturnRes = env.info.returnResult;
5015
5016 try {
5017 deferredLintHandler.flush(env.tree);
5018 env.info.returnResult = null;
5019 // java.lang.Enum may not be subclassed by a non-enum
5020 if (st.tsym == syms.enumSym &&
5021 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5022 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5023
5024 // Enums may not be extended by source-level classes
5025 if (st.tsym != null &&
5026 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5027 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5028 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5029 }
5030
5031 if (isSerializable(c.type)) {
5032 env.info.isSerializable = true;
5033 }
5034
5035 attribClassBody(env, c);
5036
5037 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5038 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5039 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5040 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5041 } finally {
5042 env.info.returnResult = prevReturnRes;
5043 log.useSource(prev);
5044 chk.setLint(prevLint);
5045 }
5046
5047 }
5048 }
5049
5050 public void visitImport(JCImport tree) {
5051 // nothing to do
5052 }
5053
5054 public void visitModuleDef(JCModuleDecl tree) {
5055 tree.sym.completeUsesProvides();
5056 ModuleSymbol msym = tree.sym;
5057 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5058 Lint prevLint = chk.setLint(lint);
5059 chk.checkModuleName(tree);
5060 chk.checkDeprecatedAnnotation(tree, msym);
5061
5062 try {
5063 deferredLintHandler.flush(tree.pos());
5064 } finally {
5065 chk.setLint(prevLint);
5066 }
5067 }
5068
5069 /** Finish the attribution of a class. */
5070 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5071 JCClassDecl tree = (JCClassDecl)env.tree;
5072 Assert.check(c == tree.sym);
5073
5074 // Validate type parameters, supertype and interfaces.
5075 attribStats(tree.typarams, env);
5076 if (!c.isAnonymous()) {
5077 //already checked if anonymous
5078 chk.validate(tree.typarams, env);
5079 chk.validate(tree.extending, env);
5080 chk.validate(tree.implementing, env);
5081 }
5082
5083 c.markAbstractIfNeeded(types);
5084
5085 // If this is a non-abstract class, check that it has no abstract
5086 // methods or unimplemented methods of an implemented interface.
5087 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5088 chk.checkAllDefined(tree.pos(), c);
5089 }
5090
5091 if ((c.flags() & ANNOTATION) != 0) {
5092 if (tree.implementing.nonEmpty())
5093 log.error(tree.implementing.head.pos(),
5094 Errors.CantExtendIntfAnnotation);
5095 if (tree.typarams.nonEmpty()) {
5096 log.error(tree.typarams.head.pos(),
5097 Errors.IntfAnnotationCantHaveTypeParams(c));
5098 }
5099
5100 // If this annotation type has a @Repeatable, validate
5101 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5102 // If this annotation type has a @Repeatable, validate
5103 if (repeatable != null) {
5104 // get diagnostic position for error reporting
5105 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5106 Assert.checkNonNull(cbPos);
5107
5108 chk.validateRepeatable(c, repeatable, cbPos);
5109 }
5110 } else {
5111 // Check that all extended classes and interfaces
5112 // are compatible (i.e. no two define methods with same arguments
5113 // yet different return types). (JLS 8.4.6.3)
5114 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5115 if (allowDefaultMethods) {
5116 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5117 }
5118 }
5119
5120 // Check that class does not import the same parameterized interface
5121 // with two different argument lists.
5122 chk.checkClassBounds(tree.pos(), c.type);
5123
5124 tree.type = c.type;
5125
5126 for (List<JCTypeParameter> l = tree.typarams;
5127 l.nonEmpty(); l = l.tail) {
5128 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5129 }
5130
5131 // Check that a generic class doesn't extend Throwable
5132 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5133 log.error(tree.extending.pos(), Errors.GenericThrowable);
5134
5135 // Check that all methods which implement some
5136 // method conform to the method they implement.
5137 chk.checkImplementations(tree);
5138
5139 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5140 checkAutoCloseable(tree.pos(), env, c.type);
5141
5142 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5143 // Attribute declaration
5144 attribStat(l.head, env);
5145 // Check that declarations in inner classes are not static (JLS 8.1.2)
5146 // Make an exception for static constants.
5147 if (c.owner.kind != PCK &&
5148 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5149 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5150 Symbol sym = null;
5151 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5152 if (sym == null ||
5153 sym.kind != VAR ||
5154 ((VarSymbol) sym).getConstValue() == null)
5155 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5156 }
5157 }
5158
5159 // Check for cycles among non-initial constructors.
5160 chk.checkCyclicConstructors(tree);
5161
5162 // Check for cycles among annotation elements.
5163 chk.checkNonCyclicElements(tree);
5164
5165 // Check for proper use of serialVersionUID
5166 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5167 && isSerializable(c.type)
5168 && (c.flags() & (Flags.ENUM | Flags.INTERFACE)) == 0
5169 && !c.isAnonymous()) {
5170 checkSerialVersionUID(tree, c);
5171 }
5172 if (allowTypeAnnos) {
5173 // Correctly organize the postions of the type annotations
5174 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5175
5176 // Check type annotations applicability rules
5177 validateTypeAnnotations(tree, false);
5178 }
5179 }
5180 // where
5181 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5182 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5183 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5184 if (types.isSameType(al.head.annotationType.type, t))
5185 return al.head.pos();
5186 }
5187
5188 return null;
5189 }
5190
5191 /** check if a type is a subtype of Serializable, if that is available. */
5192 boolean isSerializable(Type t) {
5193 try {
5194 syms.serializableType.complete();
5195 }
5196 catch (CompletionFailure e) {
5197 return false;
5198 }
5199 return types.isSubtype(t, syms.serializableType);
5200 }
5201
5202 /** Check that an appropriate serialVersionUID member is defined. */
5203 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
5204
5205 // check for presence of serialVersionUID
5206 VarSymbol svuid = null;
5207 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) {
5208 if (sym.kind == VAR) {
5209 svuid = (VarSymbol)sym;
5210 break;
5211 }
5212 }
5213
5214 if (svuid == null) {
5215 log.warning(LintCategory.SERIAL,
5216 tree.pos(), Warnings.MissingSVUID(c));
5217 return;
5218 }
5219
5220 // check that it is static final
5221 if ((svuid.flags() & (STATIC | FINAL)) !=
5222 (STATIC | FINAL))
5223 log.warning(LintCategory.SERIAL,
5224 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c));
5225
5226 // check that it is long
5227 else if (!svuid.type.hasTag(LONG))
5228 log.warning(LintCategory.SERIAL,
5229 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c));
5230
5231 // check constant
5232 else if (svuid.getConstValue() == null)
5233 log.warning(LintCategory.SERIAL,
5234 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c));
5235 }
5236
5237 private Type capture(Type type) {
5238 return types.capture(type);
5239 }
5240
5241 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5242 if (type.isErroneous()) {
5243 tree.vartype = make.at(Position.NOPOS).Erroneous();
5244 } else {
5245 tree.vartype = make.at(Position.NOPOS).Type(type);
5246 }
5247 }
5248
5249 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5250 tree.accept(new TypeAnnotationsValidator(sigOnly));
5251 }
5252 //where
5253 private final class TypeAnnotationsValidator extends TreeScanner {
5254
5255 private final boolean sigOnly;
5256 public TypeAnnotationsValidator(boolean sigOnly) {
5257 this.sigOnly = sigOnly;
5258 }
5259
5260 public void visitAnnotation(JCAnnotation tree) {
5261 chk.validateTypeAnnotation(tree, false);
5262 super.visitAnnotation(tree);
5263 }
5264 public void visitAnnotatedType(JCAnnotatedType tree) {
5265 if (!tree.underlyingType.type.isErroneous()) {
5266 super.visitAnnotatedType(tree);
5267 }
5268 }
5269 public void visitTypeParameter(JCTypeParameter tree) {
5270 chk.validateTypeAnnotations(tree.annotations, true);
5271 scan(tree.bounds);
5272 // Don't call super.
5273 // This is needed because above we call validateTypeAnnotation with
5274 // false, which would forbid annotations on type parameters.
5275 // super.visitTypeParameter(tree);
5276 }
5277 public void visitMethodDef(JCMethodDecl tree) {
5278 if (tree.recvparam != null &&
5279 !tree.recvparam.vartype.type.isErroneous()) {
5280 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
5281 tree.recvparam.vartype.type.tsym);
5282 }
5283 if (tree.restype != null && tree.restype.type != null) {
5284 validateAnnotatedType(tree.restype, tree.restype.type);
5285 }
5286 if (sigOnly) {
5287 scan(tree.mods);
5288 scan(tree.restype);
5289 scan(tree.typarams);
5290 scan(tree.recvparam);
5291 scan(tree.params);
5292 scan(tree.thrown);
5293 } else {
5294 scan(tree.defaultValue);
5295 scan(tree.body);
5296 }
5297 }
5298 public void visitVarDef(final JCVariableDecl tree) {
5299 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5300 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5301 validateAnnotatedType(tree.vartype, tree.sym.type);
5302 scan(tree.mods);
5303 scan(tree.vartype);
5304 if (!sigOnly) {
5305 scan(tree.init);
5306 }
5307 }
5308 public void visitTypeCast(JCTypeCast tree) {
5309 if (tree.clazz != null && tree.clazz.type != null)
5310 validateAnnotatedType(tree.clazz, tree.clazz.type);
5311 super.visitTypeCast(tree);
5312 }
5313 public void visitTypeTest(JCInstanceOf tree) {
5314 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5315 validateAnnotatedType(tree.pattern, tree.pattern.type);
5316 super.visitTypeTest(tree);
5317 }
5318 public void visitNewClass(JCNewClass tree) {
5319 if (tree.clazz != null && tree.clazz.type != null) {
5320 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5321 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5322 tree.clazz.type.tsym);
5323 }
5324 if (tree.def != null) {
5325 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5326 }
5327
5328 validateAnnotatedType(tree.clazz, tree.clazz.type);
5329 }
5330 super.visitNewClass(tree);
5331 }
5332 public void visitNewArray(JCNewArray tree) {
5333 if (tree.elemtype != null && tree.elemtype.type != null) {
5334 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5335 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5336 tree.elemtype.type.tsym);
5337 }
5338 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5339 }
5340 super.visitNewArray(tree);
5341 }
5342 public void visitClassDef(JCClassDecl tree) {
5343 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5344 if (sigOnly) {
5345 scan(tree.mods);
5346 scan(tree.typarams);
5347 scan(tree.extending);
5348 scan(tree.implementing);
5349 }
5350 for (JCTree member : tree.defs) {
5351 if (member.hasTag(Tag.CLASSDEF)) {
5352 continue;
5353 }
5354 scan(member);
5355 }
5356 }
5357 public void visitBlock(JCBlock tree) {
5358 if (!sigOnly) {
5359 scan(tree.stats);
5360 }
5361 }
5362
5363 /* I would want to model this after
5364 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5365 * and override visitSelect and visitTypeApply.
5366 * However, we only set the annotated type in the top-level type
5367 * of the symbol.
5368 * Therefore, we need to override each individual location where a type
5369 * can occur.
5370 */
5371 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5372 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5373
5374 if (type.isPrimitiveOrVoid()) {
5375 return;
5376 }
5377
5378 JCTree enclTr = errtree;
5379 Type enclTy = type;
5380
5381 boolean repeat = true;
5382 while (repeat) {
5383 if (enclTr.hasTag(TYPEAPPLY)) {
5384 List<Type> tyargs = enclTy.getTypeArguments();
5385 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5386 if (trargs.length() > 0) {
5387 // Nothing to do for diamonds
5388 if (tyargs.length() == trargs.length()) {
5389 for (int i = 0; i < tyargs.length(); ++i) {
5390 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5391 }
5392 }
5393 // If the lengths don't match, it's either a diamond
5394 // or some nested type that redundantly provides
5395 // type arguments in the tree.
5396 }
5397
5398 // Look at the clazz part of a generic type
5399 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5400 }
5401
5402 if (enclTr.hasTag(SELECT)) {
5403 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5404 if (enclTy != null &&
5405 !enclTy.hasTag(NONE)) {
5406 enclTy = enclTy.getEnclosingType();
5407 }
5408 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5409 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5410 if (enclTy == null || enclTy.hasTag(NONE)) {
5411 if (at.getAnnotations().size() == 1) {
5412 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5413 } else {
5414 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5415 for (JCAnnotation an : at.getAnnotations()) {
5416 comps.add(an.attribute);
5417 }
5418 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5419 }
5420 repeat = false;
5421 }
5422 enclTr = at.underlyingType;
5423 // enclTy doesn't need to be changed
5424 } else if (enclTr.hasTag(IDENT)) {
5425 repeat = false;
5426 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5427 JCWildcard wc = (JCWildcard) enclTr;
5428 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5429 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5430 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5431 } else {
5432 // Nothing to do for UNBOUND
5433 }
5434 repeat = false;
5435 } else if (enclTr.hasTag(TYPEARRAY)) {
5436 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5437 validateAnnotatedType(art.getType(), art.elemtype.type);
5438 repeat = false;
5439 } else if (enclTr.hasTag(TYPEUNION)) {
5440 JCTypeUnion ut = (JCTypeUnion) enclTr;
5441 for (JCTree t : ut.getTypeAlternatives()) {
5442 validateAnnotatedType(t, t.type);
5443 }
5444 repeat = false;
5445 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5446 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5447 for (JCTree t : it.getBounds()) {
5448 validateAnnotatedType(t, t.type);
5449 }
5450 repeat = false;
5451 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5452 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5453 repeat = false;
5454 } else {
5455 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5456 " within: "+ errtree + " with kind: " + errtree.getKind());
5457 }
5458 }
5459 }
5460
5461 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5462 Symbol sym) {
5463 // Ensure that no declaration annotations are present.
5464 // Note that a tree type might be an AnnotatedType with
5465 // empty annotations, if only declaration annotations were given.
5466 // This method will raise an error for such a type.
5467 for (JCAnnotation ai : annotations) {
5468 if (!ai.type.isErroneous() &&
5469 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5470 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5471 }
5472 }
5473 }
5474 }
5475
5476 // <editor-fold desc="post-attribution visitor">
5477
5478 /**
5479 * Handle missing types/symbols in an AST. This routine is useful when
5480 * the compiler has encountered some errors (which might have ended up
5481 * terminating attribution abruptly); if the compiler is used in fail-over
5482 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5483 * prevents NPE to be progagated during subsequent compilation steps.
5484 */
5485 public void postAttr(JCTree tree) {
5486 new PostAttrAnalyzer().scan(tree);
5487 }
5488
5489 class PostAttrAnalyzer extends TreeScanner {
5490
5491 private void initTypeIfNeeded(JCTree that) {
5492 if (that.type == null) {
5493 if (that.hasTag(METHODDEF)) {
5494 that.type = dummyMethodType((JCMethodDecl)that);
5495 } else {
5496 that.type = syms.unknownType;
5497 }
5498 }
5499 }
5500
5501 /* Construct a dummy method type. If we have a method declaration,
5502 * and the declared return type is void, then use that return type
5503 * instead of UNKNOWN to avoid spurious error messages in lambda
5504 * bodies (see:JDK-8041704).
5505 */
5506 private Type dummyMethodType(JCMethodDecl md) {
5507 Type restype = syms.unknownType;
5508 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5509 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5510 if (prim.typetag == VOID)
5511 restype = syms.voidType;
5512 }
5513 return new MethodType(List.nil(), restype,
5514 List.nil(), syms.methodClass);
5515 }
5516 private Type dummyMethodType() {
5517 return dummyMethodType(null);
5518 }
5519
5520 @Override
5521 public void scan(JCTree tree) {
5522 if (tree == null) return;
5523 if (tree instanceof JCExpression) {
5524 initTypeIfNeeded(tree);
5525 }
5526 super.scan(tree);
5527 }
5528
5529 @Override
5530 public void visitIdent(JCIdent that) {
5531 if (that.sym == null) {
5532 that.sym = syms.unknownSymbol;
5533 }
5534 }
5535
5536 @Override
5537 public void visitSelect(JCFieldAccess that) {
5538 if (that.sym == null) {
5539 that.sym = syms.unknownSymbol;
5540 }
5541 super.visitSelect(that);
5542 }
5543
5544 @Override
5545 public void visitClassDef(JCClassDecl that) {
5546 initTypeIfNeeded(that);
5547 if (that.sym == null) {
5548 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
5549 }
5550 super.visitClassDef(that);
5551 }
5552
5553 @Override
5554 public void visitMethodDef(JCMethodDecl that) {
5555 initTypeIfNeeded(that);
5556 if (that.sym == null) {
5557 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
5558 }
5559 super.visitMethodDef(that);
5560 }
5561
5562 @Override
5563 public void visitVarDef(JCVariableDecl that) {
5564 initTypeIfNeeded(that);
5565 if (that.sym == null) {
5566 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
5567 that.sym.adr = 0;
5568 }
5569 if (that.vartype == null) {
5570 that.vartype = make.at(Position.NOPOS).Erroneous();
5571 }
5572 super.visitVarDef(that);
5573 }
5574
5575 @Override
5576 public void visitBindingPattern(JCBindingPattern that) {
5577 if (that.symbol == null) {
5578 that.symbol = new BindingSymbol(that.name, that.type, syms.noSymbol);
5579 that.symbol.adr = 0;
5580 }
5581 super.visitBindingPattern(that);
5582 }
5583
5584 @Override
5585 public void visitNewClass(JCNewClass that) {
5586 if (that.constructor == null) {
5587 that.constructor = new MethodSymbol(0, names.init,
5588 dummyMethodType(), syms.noSymbol);
5589 }
5590 if (that.constructorType == null) {
5591 that.constructorType = syms.unknownType;
5592 }
5593 super.visitNewClass(that);
5594 }
5595
5596 @Override
5597 public void visitAssignop(JCAssignOp that) {
5598 if (that.operator == null) {
5599 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5600 -1, syms.noSymbol);
5601 }
5602 super.visitAssignop(that);
5603 }
5604
5605 @Override
5606 public void visitBinary(JCBinary that) {
5607 if (that.operator == null) {
5608 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5609 -1, syms.noSymbol);
5610 }
5611 super.visitBinary(that);
5612 }
5613
5614 @Override
5615 public void visitUnary(JCUnary that) {
5616 if (that.operator == null) {
5617 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5618 -1, syms.noSymbol);
5619 }
5620 super.visitUnary(that);
5621 }
5622
5623 @Override
5624 public void visitReference(JCMemberReference that) {
5625 super.visitReference(that);
5626 if (that.sym == null) {
5627 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
5628 syms.noSymbol);
5629 }
5630 }
5631 }
5632 // </editor-fold>
5633
5634 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
5635 new TreeScanner() {
5636 Symbol packge = pkg;
5637 @Override
5638 public void visitIdent(JCIdent that) {
5639 that.sym = packge;
5640 }
5641
5642 @Override
5643 public void visitSelect(JCFieldAccess that) {
5644 that.sym = packge;
5645 packge = packge.owner;
5646 super.visitSelect(that);
5647 }
5648 }.scan(pid);
5649 }
5650
5651 }