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