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