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