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