1 /*
2 * Copyright (c) 1999, 2023, 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.Map;
29 import java.util.Optional;
30
31 import javax.tools.JavaFileObject;
32 import javax.tools.JavaFileManager;
33
34 import com.sun.tools.javac.code.*;
35 import com.sun.tools.javac.code.Kinds.KindName;
36 import com.sun.tools.javac.code.Kinds.KindSelector;
37 import com.sun.tools.javac.code.Scope.*;
38 import com.sun.tools.javac.code.Symbol.*;
39 import com.sun.tools.javac.code.Type.*;
40 import com.sun.tools.javac.main.Option.PkgInfo;
41 import com.sun.tools.javac.resources.CompilerProperties.Errors;
42 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
43 import com.sun.tools.javac.tree.*;
44 import com.sun.tools.javac.tree.JCTree.*;
45 import com.sun.tools.javac.util.*;
46 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
47 import com.sun.tools.javac.util.List;
48
49 import static com.sun.tools.javac.code.Flags.*;
50 import static com.sun.tools.javac.code.Kinds.Kind.*;
51
52 /** This class enters symbols for all encountered definitions into
53 * the symbol table. The pass consists of high-level two phases,
54 * organized as follows:
55 *
56 * <p>In the first phase, all class symbols are entered into their
57 * enclosing scope, descending recursively down the tree for classes
58 * which are members of other classes. The class symbols are given a
59 * TypeEnter object as completer.
60 *
61 * <p>In the second phase classes are completed using
62 * TypeEnter.complete(). Completion might occur on demand, but
63 * any classes that are not completed that way will be eventually
64 * completed by processing the `uncompleted' queue. Completion
65 * entails determination of a class's parameters, supertype and
66 * interfaces, as well as entering all symbols defined in the
67 * class into its scope, with the exception of class symbols which
68 * have been entered in phase 1.
69 *
70 * <p>Whereas the first phase is organized as a sweep through all
71 * compiled syntax trees, the second phase is on-demand. Members of a
72 * class are entered when the contents of a class are first
73 * accessed. This is accomplished by installing completer objects in
74 * class symbols for compiled classes which invoke the type-enter
75 * phase for the corresponding class tree.
76 *
77 * <p>Classes migrate from one phase to the next via queues:
78 *
79 * <pre>{@literal
80 * class enter -> (Enter.uncompleted) --> type enter
81 * -> (Todo) --> attribute
82 * (only for toplevel classes)
83 * }</pre>
84 *
85 * <p><b>This is NOT part of any supported API.
86 * If you write code that depends on this, you do so at your own risk.
87 * This code and its internal interfaces are subject to change or
88 * deletion without notice.</b>
89 */
90 public class Enter extends JCTree.Visitor {
91 protected static final Context.Key<Enter> enterKey = new Context.Key<>();
92
93 Annotate annotate;
94 Log log;
95 Symtab syms;
96 Check chk;
97 TreeMaker make;
98 TypeEnter typeEnter;
99 Types types;
100 Lint lint;
101 Names names;
102 JavaFileManager fileManager;
103 PkgInfo pkginfoOpt;
104 TypeEnvs typeEnvs;
105 Modules modules;
106 JCDiagnostic.Factory diags;
107
108 private final Todo todo;
109
110 public static Enter instance(Context context) {
111 Enter instance = context.get(enterKey);
112 if (instance == null)
113 instance = new Enter(context);
114 return instance;
115 }
116
117 @SuppressWarnings("this-escape")
118 protected Enter(Context context) {
119 context.put(enterKey, this);
120
121 log = Log.instance(context);
122 make = TreeMaker.instance(context);
123 syms = Symtab.instance(context);
124 chk = Check.instance(context);
125 typeEnter = TypeEnter.instance(context);
126 types = Types.instance(context);
127 annotate = Annotate.instance(context);
128 lint = Lint.instance(context);
129 names = Names.instance(context);
130 modules = Modules.instance(context);
131 diags = JCDiagnostic.Factory.instance(context);
132
133 predefClassDef = make.ClassDef(
134 make.Modifiers(PUBLIC),
135 syms.predefClass.name,
136 List.nil(),
137 null,
138 List.nil(),
139 List.nil());
140 predefClassDef.sym = syms.predefClass;
141 todo = Todo.instance(context);
142 fileManager = context.get(JavaFileManager.class);
143
144 Options options = Options.instance(context);
145 pkginfoOpt = PkgInfo.get(options);
146 typeEnvs = TypeEnvs.instance(context);
147 }
148
149 /** Accessor for typeEnvs
150 */
151 public Env<AttrContext> getEnv(TypeSymbol sym) {
152 return typeEnvs.get(sym);
153 }
154
155 public Iterable<Env<AttrContext>> getEnvs() {
156 return typeEnvs.values();
157 }
158
159 public Env<AttrContext> getClassEnv(TypeSymbol sym) {
160 Env<AttrContext> localEnv = getEnv(sym);
161 if (localEnv == null) return null;
162 Env<AttrContext> lintEnv = localEnv;
163 while (lintEnv.info.lint == null)
164 lintEnv = lintEnv.next;
165 localEnv.info.lint = lintEnv.info.lint.augment(sym);
166 return localEnv;
167 }
168
169 /** The queue of all classes that might still need to be completed;
170 * saved and initialized by main().
171 */
172 ListBuffer<ClassSymbol> uncompleted;
173
174 /** The queue of modules whose imports still need to be checked. */
175 ListBuffer<JCCompilationUnit> unfinishedModules = new ListBuffer<>();
176
177 /** A dummy class to serve as enclClass for toplevel environments.
178 */
179 private JCClassDecl predefClassDef;
180
181 /* ************************************************************************
182 * environment construction
183 *************************************************************************/
184
185
186 /** Create a fresh environment for class bodies.
187 * This will create a fresh scope for local symbols of a class, referred
188 * to by the environments info.scope field.
189 * This scope will contain
190 * - symbols for this and super
191 * - symbols for any type parameters
192 * In addition, it serves as an anchor for scopes of methods and initializers
193 * which are nested in this scope via Scope.dup().
194 * This scope should not be confused with the members scope of a class.
195 *
196 * @param tree The class definition.
197 * @param env The environment current outside of the class definition.
198 */
199 public Env<AttrContext> classEnv(JCClassDecl tree, Env<AttrContext> env) {
200 Env<AttrContext> localEnv =
201 env.dup(tree, env.info.dup(WriteableScope.create(tree.sym)));
202 localEnv.enclClass = tree;
203 localEnv.outer = env;
204 localEnv.info.isSelfCall = false;
205 localEnv.info.lint = null; // leave this to be filled in by Attr,
206 // when annotations have been processed
207 localEnv.info.isAnonymousDiamond = TreeInfo.isDiamond(env.tree);
208 return localEnv;
209 }
210
211 /** Create a fresh environment for toplevels.
212 * @param tree The toplevel tree.
213 */
214 Env<AttrContext> topLevelEnv(JCCompilationUnit tree) {
215 Env<AttrContext> localEnv = new Env<>(tree, new AttrContext());
216 localEnv.toplevel = tree;
217 localEnv.enclClass = predefClassDef;
218 tree.toplevelScope = WriteableScope.create(tree.packge);
219 tree.namedImportScope = new NamedImportScope(tree.packge);
220 tree.starImportScope = new StarImportScope(tree.packge);
221 localEnv.info.scope = tree.toplevelScope;
222 localEnv.info.lint = lint;
223 return localEnv;
224 }
225
226 public Env<AttrContext> getTopLevelEnv(JCCompilationUnit tree) {
227 Env<AttrContext> localEnv = new Env<>(tree, new AttrContext());
228 localEnv.toplevel = tree;
229 localEnv.enclClass = predefClassDef;
230 localEnv.info.scope = tree.toplevelScope;
231 localEnv.info.lint = lint;
232 return localEnv;
233 }
234
235 /** The scope in which a member definition in environment env is to be entered
236 * This is usually the environment's scope, except for class environments,
237 * where the local scope is for type variables, and the this and super symbol
238 * only, and members go into the class member scope.
239 */
240 WriteableScope enterScope(Env<AttrContext> env) {
241 return (env.tree.hasTag(JCTree.Tag.CLASSDEF))
242 ? ((JCClassDecl) env.tree).sym.members_field
243 : env.info.scope;
244 }
245
246 /** Create a fresh environment for modules.
247 *
248 * @param tree The module definition.
249 * @param env The environment current outside of the module definition.
250 */
251 public Env<AttrContext> moduleEnv(JCModuleDecl tree, Env<AttrContext> env) {
252 Assert.checkNonNull(tree.sym);
253 Env<AttrContext> localEnv =
254 env.dup(tree, env.info.dup(WriteableScope.create(tree.sym)));
255 localEnv.enclClass = predefClassDef;
256 localEnv.outer = env;
257 localEnv.info.isSelfCall = false;
258 localEnv.info.lint = null; // leave this to be filled in by Attr,
259 // when annotations have been processed
260 return localEnv;
261 }
262
263
264 /* ************************************************************************
265 * Visitor methods for phase 1: class enter
266 *************************************************************************/
267
268 /** Visitor argument: the current environment.
269 */
270 protected Env<AttrContext> env;
271
272 /** Visitor result: the computed type.
273 */
274 Type result;
275
276 /** Visitor method: enter all classes in given tree, catching any
277 * completion failure exceptions. Return the tree's type.
278 *
279 * @param tree The tree to be visited.
280 * @param env The environment visitor argument.
281 */
282 Type classEnter(JCTree tree, Env<AttrContext> env) {
283 Env<AttrContext> prevEnv = this.env;
284 try {
285 this.env = env;
286 annotate.blockAnnotations();
287 tree.accept(this);
288 return result;
289 } catch (CompletionFailure ex) {
290 return chk.completionError(tree.pos(), ex);
291 } finally {
292 annotate.unblockAnnotations();
293 this.env = prevEnv;
294 }
295 }
296
297 /** Visitor method: enter classes of a list of trees, returning a list of types.
298 */
299 <T extends JCTree> List<Type> classEnter(List<T> trees, Env<AttrContext> env) {
300 ListBuffer<Type> ts = new ListBuffer<>();
301 for (List<T> l = trees; l.nonEmpty(); l = l.tail) {
302 Type t = classEnter(l.head, env);
303 if (t != null)
304 ts.append(t);
305 }
306 return ts.toList();
307 }
308
309 @Override
310 public void visitTopLevel(JCCompilationUnit tree) {
311 JavaFileObject prev = log.useSource(tree.sourcefile);
312 boolean addEnv = false;
313 boolean isPkgInfo = tree.sourcefile.isNameCompatible("package-info",
314 JavaFileObject.Kind.SOURCE);
315 if (TreeInfo.isModuleInfo(tree)) {
316 JCPackageDecl pd = tree.getPackage();
317 if (pd != null) {
318 log.error(pd.pos(), Errors.NoPkgInModuleInfoJava);
319 }
320 tree.packge = syms.rootPackage;
321 Env<AttrContext> topEnv = topLevelEnv(tree);
322 classEnter(tree.defs, topEnv);
323 tree.modle.usesProvidesCompleter = modules.getUsesProvidesCompleter();
324 } else {
325 JCPackageDecl pd = tree.getPackage();
326 if (pd != null) {
327 tree.packge = pd.packge = syms.enterPackage(tree.modle, TreeInfo.fullName(pd.pid));
328 setPackageSymbols.scan(pd);
329 if ( pd.annotations.nonEmpty()
330 || pkginfoOpt == PkgInfo.ALWAYS
331 || tree.docComments != null) {
332 if (isPkgInfo) {
333 addEnv = true;
334 } else if (pd.annotations.nonEmpty()) {
335 log.error(pd.annotations.head.pos(),
336 Errors.PkgAnnotationsSbInPackageInfoJava);
337 }
338 }
339 } else {
340 tree.packge = tree.modle.unnamedPackage;
341 }
342
343 Map<Name, PackageSymbol> visiblePackages = tree.modle.visiblePackages;
344 Optional<ModuleSymbol> dependencyWithPackage =
345 syms.listPackageModules(tree.packge.fullname)
346 .stream()
347 .filter(m -> m != tree.modle)
348 .filter(cand -> visiblePackages.get(tree.packge.fullname) == syms.getPackage(cand, tree.packge.fullname))
349 .findAny();
350
351 if (dependencyWithPackage.isPresent()) {
352 log.error(pd, Errors.PackageInOtherModule(dependencyWithPackage.get()));
353 }
354
355 tree.packge.complete(); // Find all classes in package.
356
357 Env<AttrContext> topEnv = topLevelEnv(tree);
358 Env<AttrContext> packageEnv = null;
359
360 // Save environment of package-info.java file.
361 if (isPkgInfo) {
362 packageEnv = topEnv.dup(pd != null ? pd : tree);
363
364 Env<AttrContext> env0 = typeEnvs.get(tree.packge);
365 if (env0 != null) {
366 JCCompilationUnit tree0 = env0.toplevel;
367 if (!fileManager.isSameFile(tree.sourcefile, tree0.sourcefile)) {
368 log.warning(pd != null ? pd.pid.pos() : null,
369 Warnings.PkgInfoAlreadySeen(tree.packge));
370 }
371 }
372 typeEnvs.put(tree.packge, packageEnv);
373
374 for (Symbol q = tree.packge; q != null && q.kind == PCK; q = q.owner)
375 q.flags_field |= EXISTS;
376
377 Name name = names.package_info;
378 ClassSymbol c = syms.enterClass(tree.modle, name, tree.packge);
379 c.flatname = names.fromString(tree.packge + "." + name);
380 c.classfile = c.sourcefile = tree.sourcefile;
381 c.completer = Completer.NULL_COMPLETER;
382 c.members_field = WriteableScope.create(c);
383 tree.packge.package_info = c;
384 tree.packge.sourcefile = tree.sourcefile;
385 }
386 classEnter(tree.defs, topEnv);
387 if (addEnv) {
388 todo.append(packageEnv);
389 }
390 }
391 log.useSource(prev);
392 result = null;
393 }
394 //where:
395 //set package Symbols to the package expression:
396 private final TreeScanner setPackageSymbols = new TreeScanner() {
397 Symbol currentPackage;
398
399 @Override
400 public void visitIdent(JCIdent tree) {
401 tree.sym = currentPackage;
402 tree.type = currentPackage.type;
403 }
404
405 @Override
406 public void visitSelect(JCFieldAccess tree) {
407 tree.sym = currentPackage;
408 tree.type = currentPackage.type;
409 currentPackage = currentPackage.owner;
410 super.visitSelect(tree);
411 }
412
413 @Override
414 public void visitPackageDef(JCPackageDecl tree) {
415 currentPackage = tree.packge;
416 scan(tree.pid);
417 }
418 };
419
420 @Override
421 public void visitClassDef(JCClassDecl tree) {
422 Symbol owner = env.info.scope.owner;
423 WriteableScope enclScope = enterScope(env);
424 ClassSymbol c;
425 if (owner.kind == PCK) {
426 // We are seeing a toplevel class.
427 PackageSymbol packge = (PackageSymbol)owner;
428 for (Symbol q = packge; q != null && q.kind == PCK; q = q.owner)
429 q.flags_field |= EXISTS;
430 c = syms.enterClass(env.toplevel.modle, tree.name, packge);
431 packge.members().enterIfAbsent(c);
432 if ((tree.mods.flags & PUBLIC) != 0 && !classNameMatchesFileName(c, env)) {
433 KindName topElement = KindName.CLASS;
434 if ((tree.mods.flags & ENUM) != 0) {
435 topElement = KindName.ENUM;
436 } else if ((tree.mods.flags & INTERFACE) != 0) {
437 topElement = KindName.INTERFACE;
438 }
439 log.error(tree.pos(),
440 Errors.ClassPublicShouldBeInFile(topElement, tree.name));
441 }
442 if ((tree.mods.flags & UNNAMED_CLASS) != 0) {
443 syms.removeClass(env.toplevel.modle, tree.name);
444 }
445 } else {
446 if (!tree.name.isEmpty() &&
447 !chk.checkUniqueClassName(tree.pos(), tree.name, enclScope)) {
448 result = null;
449 return;
450 }
451 if (owner.kind == TYP) {
452 // We are seeing a member class.
453 c = syms.enterClass(env.toplevel.modle, tree.name, (TypeSymbol)owner);
454 if (c.owner != owner) {
455 if (c.name != tree.name) {
456 log.error(tree.pos(), Errors.SameBinaryName(c.name, tree.name));
457 result = types.createErrorType(tree.name, (TypeSymbol)owner, Type.noType);
458 tree.sym = (ClassSymbol)result.tsym;
459 return;
460 }
461 //anonymous class loaded from a classfile may be recreated from source (see below)
462 //if this class is a member of such an anonymous class, fix the owner:
463 Assert.check(owner.owner.kind != TYP, owner::toString);
464 Assert.check(c.owner.kind == TYP, () -> c.owner.toString());
465 ClassSymbol cowner = (ClassSymbol) c.owner;
466 if (cowner.members_field != null) {
467 cowner.members_field.remove(c);
468 }
469 c.owner = owner;
470 }
471 if ((owner.flags_field & INTERFACE) != 0) {
472 tree.mods.flags |= PUBLIC | STATIC;
473 }
474 } else {
475 // We are seeing a local class.
476 c = syms.defineClass(tree.name, owner);
477 c.flatname = chk.localClassName(c);
478 if (!c.name.isEmpty())
479 chk.checkTransparentClass(tree.pos(), c, env.info.scope);
480 }
481 }
482 tree.sym = c;
483
484 // Enter class into `compiled' table and enclosing scope.
485 if (chk.getCompiled(c) != null) {
486 duplicateClass(tree.pos(), c);
487 result = types.createErrorType(tree.name, (TypeSymbol)owner, Type.noType);
488 tree.sym = (ClassSymbol)result.tsym;
489 return;
490 }
491 chk.putCompiled(c);
492 enclScope.enter(c);
493
494 // Set up an environment for class block and store in `typeEnvs'
495 // table, to be retrieved later in memberEnter and attribution.
496 Env<AttrContext> localEnv = classEnv(tree, env);
497 typeEnvs.put(c, localEnv);
498
499 // Fill out class fields.
500 c.completer = Completer.NULL_COMPLETER; // do not allow the initial completer linger on.
501 c.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, c, tree) | FROM_SOURCE;
502 c.classfile = c.sourcefile = env.toplevel.sourcefile;
503 c.members_field = WriteableScope.create(c);
504 c.isPermittedExplicit = tree.permitting.nonEmpty();
505 c.clearAnnotationMetadata();
506
507 ClassType ct = (ClassType)c.type;
508 if (owner.kind != PCK && (c.flags_field & STATIC) == 0) {
509 // We are seeing a local or inner class.
510 // Set outer_field of this class to closest enclosing class
511 // which contains this class in a non-static context
512 // (its "enclosing instance class"), provided such a class exists.
513 Symbol owner1 = owner;
514 while (owner1.kind.matches(KindSelector.VAL_MTH) &&
515 (owner1.flags_field & STATIC) == 0) {
516 owner1 = owner1.owner;
517 }
518 if (owner1.kind == TYP) {
519 ct.setEnclosingType(owner1.type);
520 }
521 }
522
523 // Enter type parameters.
524 ct.typarams_field = classEnter(tree.typarams, localEnv);
525 ct.allparams_field = null;
526
527 // install further completer for this type.
528 c.completer = typeEnter;
529
530 // Add non-local class to uncompleted, to make sure it will be
531 // completed later.
532 if (!c.isDirectlyOrIndirectlyLocal() && uncompleted != null) uncompleted.append(c);
533 // System.err.println("entering " + c.fullname + " in " + c.owner);//DEBUG
534
535 // Recursively enter all member classes.
536 classEnter(tree.defs, localEnv);
537
538 // Assert.checkNonNull(c.modle, c.sourcefile.toString());
539
540 result = c.type;
541 }
542 //where
543 /** Does class have the same name as the file it appears in?
544 */
545 private static boolean classNameMatchesFileName(ClassSymbol c,
546 Env<AttrContext> env) {
547 return env.toplevel.sourcefile.isNameCompatible(c.name.toString(),
548 JavaFileObject.Kind.SOURCE);
549 }
550
551 /** Complain about a duplicate class. */
552 protected void duplicateClass(DiagnosticPosition pos, ClassSymbol c) {
553 log.error(pos, Errors.DuplicateClass(c.fullname));
554 }
555
556 /** Class enter visitor method for type parameters.
557 * Enter a symbol for type parameter in local scope, after checking that it
558 * is unique.
559 */
560 @Override
561 public void visitTypeParameter(JCTypeParameter tree) {
562 TypeVar a = (tree.type != null)
563 ? (TypeVar)tree.type
564 : new TypeVar(tree.name, env.info.scope.owner, syms.botType);
565 tree.type = a;
566 if (chk.checkUnique(tree.pos(), a.tsym, env.info.scope)) {
567 env.info.scope.enter(a.tsym);
568 }
569 result = a;
570 }
571
572 @Override
573 public void visitModuleDef(JCModuleDecl tree) {
574 Env<AttrContext> moduleEnv = moduleEnv(tree, env);
575 typeEnvs.put(tree.sym, moduleEnv);
576 if (modules.isInModuleGraph(tree.sym)) {
577 todo.append(moduleEnv);
578 }
579 }
580
581 /** Default class enter visitor method: do nothing.
582 */
583 @Override
584 public void visitTree(JCTree tree) {
585 result = null;
586 }
587
588 /** Main method: enter all classes in a list of toplevel trees.
589 * @param trees The list of trees to be processed.
590 */
591 public void main(List<JCCompilationUnit> trees) {
592 complete(trees, null);
593 }
594
595 /** Main method: enter classes from the list of toplevel trees, possibly
596 * skipping TypeEnter for all but 'c' by placing them on the uncompleted
597 * list.
598 * @param trees The list of trees to be processed.
599 * @param c The class symbol to be processed or null to process all.
600 */
601 public void complete(List<JCCompilationUnit> trees, ClassSymbol c) {
602 annotate.blockAnnotations();
603 ListBuffer<ClassSymbol> prevUncompleted = uncompleted;
604 if (typeEnter.completionEnabled) uncompleted = new ListBuffer<>();
605
606 try {
607 // enter all classes, and construct uncompleted list
608 classEnter(trees, null);
609
610 // complete all uncompleted classes in memberEnter
611 if (typeEnter.completionEnabled) {
612 while (uncompleted.nonEmpty()) {
613 ClassSymbol clazz = uncompleted.next();
614 if (c == null || c == clazz || prevUncompleted == null)
615 clazz.complete();
616 else
617 // defer
618 prevUncompleted.append(clazz);
619 }
620
621 if (!modules.modulesInitialized()) {
622 for (JCCompilationUnit cut : trees) {
623 if (cut.getModuleDecl() != null) {
624 unfinishedModules.append(cut);
625 } else {
626 typeEnter.ensureImportsChecked(List.of(cut));
627 }
628 }
629 } else {
630 typeEnter.ensureImportsChecked(unfinishedModules.toList());
631 unfinishedModules.clear();
632 typeEnter.ensureImportsChecked(trees);
633 }
634 }
635 } finally {
636 uncompleted = prevUncompleted;
637 annotate.unblockAnnotations();
638 }
639 }
640
641 public void newRound() {
642 typeEnvs.clear();
643 }
644
645 public void unenter(JCCompilationUnit topLevel, JCTree tree) {
646 new UnenterScanner(topLevel.modle).scan(tree);
647 }
648 class UnenterScanner extends TreeScanner {
649 private final ModuleSymbol msym;
650
651 public UnenterScanner(ModuleSymbol msym) {
652 this.msym = msym;
653 }
654
655 @Override
656 public void visitClassDef(JCClassDecl tree) {
657 ClassSymbol csym = tree.sym;
658 //if something went wrong during method applicability check
659 //it is possible that nested expressions inside argument expression
660 //are left unchecked - in such cases there's nothing to clean up.
661 if (csym == null) return;
662 typeEnvs.remove(csym);
663 chk.removeCompiled(csym);
664 chk.clearLocalClassNameIndexes(csym);
665 syms.removeClass(msym, csym.flatname);
666 super.visitClassDef(tree);
667 }
668 }
669 }