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