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