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src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java

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1185                 }
1186                 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1187                     log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1188             } else {
1189                 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1190                     if ((owner.flags() & INTERFACE) != 0) {
1191                         log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1192                     } else {
1193                         log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1194                     }
1195                 } else if ((tree.mods.flags & NATIVE) != 0) {
1196                     log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1197                 }
1198                 // Add an implicit super() call unless an explicit call to
1199                 // super(...) or this(...) is given
1200                 // or we are compiling class java.lang.Object.
1201                 if (isConstructor && owner.type != syms.objectType) {
1202                     if (!TreeInfo.hasAnyConstructorCall(tree)) {
1203                         JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1204                                 make.Ident(names._super), make.Idents(List.nil())));
1205                         tree.body.stats = tree.body.stats.prepend(supCall);




1206                     } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1207                             (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1208                             TreeInfo.hasConstructorCall(tree, names._super)) {
1209                         // enum constructors are not allowed to call super
1210                         // directly, so make sure there aren't any super calls
1211                         // in enum constructors, except in the compiler
1212                         // generated one.
1213                         log.error(tree.body.stats.head.pos(),
1214                                   Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1215                     }
1216                     if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1217                         List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1218                         List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1219                         if (!initParamNames.equals(recordComponentNames)) {
1220                             log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1221                                     Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1222                         }
1223                         if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1224                             log.error(tree,
1225                                     Errors.InvalidCanonicalConstructorInRecord(

1295         chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1296 
1297         try {
1298             v.getConstValue(); // ensure compile-time constant initializer is evaluated
1299             deferredLintHandler.flush(tree, lint);
1300             chk.checkDeprecatedAnnotation(tree.pos(), v);
1301 
1302             if (tree.init != null) {
1303                 if ((v.flags_field & FINAL) == 0 ||
1304                     !memberEnter.needsLazyConstValue(tree.init)) {
1305                     // Not a compile-time constant
1306                     // Attribute initializer in a new environment
1307                     // with the declared variable as owner.
1308                     // Check that initializer conforms to variable's declared type.
1309                     Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1310                     initEnv.info.lint = lint;
1311                     // In order to catch self-references, we set the variable's
1312                     // declaration position to maximal possible value, effectively
1313                     // marking the variable as undefined.
1314                     initEnv.info.enclVar = v;
1315                     attribExpr(tree.init, initEnv, v.type);
1316                     if (tree.isImplicitlyTyped()) {
1317                         //fixup local variable type
1318                         v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);









1319                     }
1320                 }
1321                 if (tree.isImplicitlyTyped()) {
1322                     setSyntheticVariableType(tree, v.type);
1323                 }
1324             }
1325             result = tree.type = v.type;
1326             if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1327                 if (isNonArgsMethodInObject(v.name)) {
1328                     log.error(tree, Errors.IllegalRecordComponentName(v));
1329                 }
1330             }
1331         }
1332         finally {
1333             chk.setLint(prevLint);
1334         }
1335     }
1336 
1337     private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1338         if (tree.init != null &&

1418             }
1419         }
1420     }
1421 
1422     public void visitSkip(JCSkip tree) {
1423         result = null;
1424     }
1425 
1426     public void visitBlock(JCBlock tree) {
1427         if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1428             // Block is a static or instance initializer;
1429             // let the owner of the environment be a freshly
1430             // created BLOCK-method.
1431             Symbol fakeOwner =
1432                 new MethodSymbol(tree.flags | BLOCK |
1433                     env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1434                     env.info.scope.owner);
1435             final Env<AttrContext> localEnv =
1436                 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1437 
1438             if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;




1439             // Attribute all type annotations in the block
1440             annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1441             annotate.flush();
1442             attribStats(tree.stats, localEnv);
1443 
1444             {
1445                 // Store init and clinit type annotations with the ClassSymbol
1446                 // to allow output in Gen.normalizeDefs.
1447                 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1448                 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1449                 if ((tree.flags & STATIC) != 0) {
1450                     cs.appendClassInitTypeAttributes(tas);
1451                 } else {
1452                     cs.appendInitTypeAttributes(tas);
1453                 }
1454             }
1455         } else {
1456             // Create a new local environment with a local scope.
1457             Env<AttrContext> localEnv =
1458                 env.dup(tree, env.info.dup(env.info.scope.dup()));

1927     // where
1928     /** Return the selected enumeration constant symbol, or null. */
1929     private Symbol enumConstant(JCTree tree, Type enumType) {
1930         if (tree.hasTag(IDENT)) {
1931             JCIdent ident = (JCIdent)tree;
1932             Name name = ident.name;
1933             for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1934                 if (sym.kind == VAR) {
1935                     Symbol s = ident.sym = sym;
1936                     ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1937                     ident.type = s.type;
1938                     return ((s.flags_field & Flags.ENUM) == 0)
1939                         ? null : s;
1940                 }
1941             }
1942         }
1943         return null;
1944     }
1945 
1946     public void visitSynchronized(JCSynchronized tree) {
1947         chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1948         if (isValueBased(tree.lock.type)) {
1949             env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1950         }
1951         attribStat(tree.body, env);
1952         result = null;
1953     }
1954         // where
1955         private boolean isValueBased(Type t) {
1956             return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1957         }
1958 
1959 
1960     public void visitTry(JCTry tree) {
1961         // Create a new local environment with a local
1962         Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1963         try {
1964             boolean isTryWithResource = tree.resources.nonEmpty();
1965             // Create a nested environment for attributing the try block if needed
1966             Env<AttrContext> tryEnv = isTryWithResource ?
1967                 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1968                 localEnv;
1969             try {
1970                 // Attribute resource declarations
1971                 for (JCTree resource : tree.resources) {
1972                     CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1973                         @Override
1974                         public void report(DiagnosticPosition pos, JCDiagnostic details) {
1975                             chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1976                         }
1977                     };
1978                     ResultInfo twrResult =
1979                         new ResultInfo(KindSelector.VAR,

4372     }
4373 
4374     public void visitSelect(JCFieldAccess tree) {
4375         // Determine the expected kind of the qualifier expression.
4376         KindSelector skind = KindSelector.NIL;
4377         if (tree.name == names._this || tree.name == names._super ||
4378                 tree.name == names._class)
4379         {
4380             skind = KindSelector.TYP;
4381         } else {
4382             if (pkind().contains(KindSelector.PCK))
4383                 skind = KindSelector.of(skind, KindSelector.PCK);
4384             if (pkind().contains(KindSelector.TYP))
4385                 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4386             if (pkind().contains(KindSelector.VAL_MTH))
4387                 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4388         }
4389 
4390         // Attribute the qualifier expression, and determine its symbol (if any).
4391         Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));

4392         if (!pkind().contains(KindSelector.TYP_PCK))
4393             site = capture(site); // Capture field access
4394 
4395         // don't allow T.class T[].class, etc
4396         if (skind == KindSelector.TYP) {
4397             Type elt = site;
4398             while (elt.hasTag(ARRAY))
4399                 elt = ((ArrayType)elt).elemtype;
4400             if (elt.hasTag(TYPEVAR)) {
4401                 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4402                 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4403                 tree.sym = tree.type.tsym;
4404                 return ;
4405             }
4406         }
4407 
4408         // If qualifier symbol is a type or `super', assert `selectSuper'
4409         // for the selection. This is relevant for determining whether
4410         // protected symbols are accessible.
4411         Symbol sitesym = TreeInfo.symbol(tree.selected);

5470                                                       .filter(s -> s.tsym.isSealed())
5471                                                       .map(s -> (ClassSymbol) s.tsym)
5472                                                       .collect(List.collector());
5473 
5474                 if (sealedSupers.isEmpty()) {
5475                     if ((c.flags_field & Flags.NON_SEALED) != 0) {
5476                         boolean hasErrorSuper = false;
5477 
5478                         hasErrorSuper |= types.directSupertypes(c.type)
5479                                               .stream()
5480                                               .anyMatch(s -> s.tsym.kind == Kind.ERR);
5481 
5482                         ClassType ct = (ClassType) c.type;
5483 
5484                         hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5485 
5486                         if (!hasErrorSuper) {
5487                             log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5488                         }
5489                     }
5490                 } else {
5491                     if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5492                         log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5493                     }
5494 
5495                     if (!c.type.isCompound()) {
5496                         for (ClassSymbol supertypeSym : sealedSupers) {
5497                             if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5498                                 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5499                             }
5500                         }
5501                         if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5502                             log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5503                                     c.isInterface() ?
5504                                             Errors.NonSealedOrSealedExpected :
5505                                             Errors.NonSealedSealedOrFinalExpected);
5506                         }
5507                     }
5508                 }
5509 
5510                 deferredLintHandler.flush(env.tree, env.info.lint);
5511                 env.info.returnResult = null;
5512                 // java.lang.Enum may not be subclassed by a non-enum
5513                 if (st.tsym == syms.enumSym &&
5514                     ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5515                     log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5516 
5517                 // Enums may not be extended by source-level classes
5518                 if (st.tsym != null &&
5519                     ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5520                     ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5521                     log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5522                 }
5523 
5524                 if (rs.isSerializable(c.type)) {
5525                     env.info.isSerializable = true;
5526                 }
5527 





5528                 attribClassBody(env, c);
5529 
5530                 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5531                 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5532                 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5533                 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5534 
5535                 if (c.isImplicit()) {
5536                     chk.checkHasMain(env.tree.pos(), c);
5537                 }
5538             } finally {
5539                 env.info.returnResult = prevReturnRes;
5540                 log.useSource(prev);
5541                 chk.setLint(prevLint);
5542             }
5543 
5544         }
5545     }
5546 
5547     public void visitImport(JCImport tree) {

5650                         sym.kind != VAR ||
5651                         sym.getConstValue() == null)
5652                     log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5653             }
5654         }
5655 
5656         // Check for proper placement of super()/this() calls.
5657         chk.checkSuperInitCalls(tree);
5658 
5659         // Check for cycles among non-initial constructors.
5660         chk.checkCyclicConstructors(tree);
5661 
5662         // Check for cycles among annotation elements.
5663         chk.checkNonCyclicElements(tree);
5664 
5665         // Check for proper use of serialVersionUID and other
5666         // serialization-related fields and methods
5667         if (env.info.lint.isEnabled(LintCategory.SERIAL)
5668                 && rs.isSerializable(c.type)
5669                 && !c.isAnonymous()) {
5670             chk.checkSerialStructure(tree, c);
5671         }
5672         // Correctly organize the positions of the type annotations
5673         typeAnnotations.organizeTypeAnnotationsBodies(tree);
5674 
5675         // Check type annotations applicability rules
5676         validateTypeAnnotations(tree, false);
5677     }
5678         // where
5679         /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5680         private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5681             for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5682                 if (types.isSameType(al.head.annotationType.type, t))
5683                     return al.head.pos();
5684             }
5685 
5686             return null;
5687         }
5688 
5689     private Type capture(Type type) {
5690         return types.capture(type);

1185                 }
1186                 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1187                     log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1188             } else {
1189                 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1190                     if ((owner.flags() & INTERFACE) != 0) {
1191                         log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1192                     } else {
1193                         log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1194                     }
1195                 } else if ((tree.mods.flags & NATIVE) != 0) {
1196                     log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1197                 }
1198                 // Add an implicit super() call unless an explicit call to
1199                 // super(...) or this(...) is given
1200                 // or we are compiling class java.lang.Object.
1201                 if (isConstructor && owner.type != syms.objectType) {
1202                     if (!TreeInfo.hasAnyConstructorCall(tree)) {
1203                         JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1204                                 make.Ident(names._super), make.Idents(List.nil())));
1205                         if (owner.isValueClass() || owner.hasStrict()) {
1206                             tree.body.stats = tree.body.stats.append(supCall);
1207                         } else {
1208                             tree.body.stats = tree.body.stats.prepend(supCall);
1209                         }
1210                     } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1211                             (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1212                             TreeInfo.hasConstructorCall(tree, names._super)) {
1213                         // enum constructors are not allowed to call super
1214                         // directly, so make sure there aren't any super calls
1215                         // in enum constructors, except in the compiler
1216                         // generated one.
1217                         log.error(tree.body.stats.head.pos(),
1218                                   Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1219                     }
1220                     if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1221                         List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1222                         List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1223                         if (!initParamNames.equals(recordComponentNames)) {
1224                             log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1225                                     Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1226                         }
1227                         if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1228                             log.error(tree,
1229                                     Errors.InvalidCanonicalConstructorInRecord(

1299         chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1300 
1301         try {
1302             v.getConstValue(); // ensure compile-time constant initializer is evaluated
1303             deferredLintHandler.flush(tree, lint);
1304             chk.checkDeprecatedAnnotation(tree.pos(), v);
1305 
1306             if (tree.init != null) {
1307                 if ((v.flags_field & FINAL) == 0 ||
1308                     !memberEnter.needsLazyConstValue(tree.init)) {
1309                     // Not a compile-time constant
1310                     // Attribute initializer in a new environment
1311                     // with the declared variable as owner.
1312                     // Check that initializer conforms to variable's declared type.
1313                     Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1314                     initEnv.info.lint = lint;
1315                     // In order to catch self-references, we set the variable's
1316                     // declaration position to maximal possible value, effectively
1317                     // marking the variable as undefined.
1318                     initEnv.info.enclVar = v;
1319                     boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1320                     try {
1321                         if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1322                             // strict instance initializer in a value class
1323                             initEnv.info.ctorPrologue = true;
1324                         }
1325                         attribExpr(tree.init, initEnv, v.type);
1326                         if (tree.isImplicitlyTyped()) {
1327                             //fixup local variable type
1328                             v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1329                         }
1330                     } finally {
1331                         initEnv.info.ctorPrologue = previousCtorPrologue;
1332                     }
1333                 }
1334                 if (tree.isImplicitlyTyped()) {
1335                     setSyntheticVariableType(tree, v.type);
1336                 }
1337             }
1338             result = tree.type = v.type;
1339             if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1340                 if (isNonArgsMethodInObject(v.name)) {
1341                     log.error(tree, Errors.IllegalRecordComponentName(v));
1342                 }
1343             }
1344         }
1345         finally {
1346             chk.setLint(prevLint);
1347         }
1348     }
1349 
1350     private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1351         if (tree.init != null &&

1431             }
1432         }
1433     }
1434 
1435     public void visitSkip(JCSkip tree) {
1436         result = null;
1437     }
1438 
1439     public void visitBlock(JCBlock tree) {
1440         if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1441             // Block is a static or instance initializer;
1442             // let the owner of the environment be a freshly
1443             // created BLOCK-method.
1444             Symbol fakeOwner =
1445                 new MethodSymbol(tree.flags | BLOCK |
1446                     env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1447                     env.info.scope.owner);
1448             final Env<AttrContext> localEnv =
1449                 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1450 
1451             if ((tree.flags & STATIC) != 0) {
1452                 localEnv.info.staticLevel++;
1453             } else {
1454                 localEnv.info.instanceInitializerBlock = true;
1455             }
1456             // Attribute all type annotations in the block
1457             annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1458             annotate.flush();
1459             attribStats(tree.stats, localEnv);
1460 
1461             {
1462                 // Store init and clinit type annotations with the ClassSymbol
1463                 // to allow output in Gen.normalizeDefs.
1464                 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1465                 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1466                 if ((tree.flags & STATIC) != 0) {
1467                     cs.appendClassInitTypeAttributes(tas);
1468                 } else {
1469                     cs.appendInitTypeAttributes(tas);
1470                 }
1471             }
1472         } else {
1473             // Create a new local environment with a local scope.
1474             Env<AttrContext> localEnv =
1475                 env.dup(tree, env.info.dup(env.info.scope.dup()));

1944     // where
1945     /** Return the selected enumeration constant symbol, or null. */
1946     private Symbol enumConstant(JCTree tree, Type enumType) {
1947         if (tree.hasTag(IDENT)) {
1948             JCIdent ident = (JCIdent)tree;
1949             Name name = ident.name;
1950             for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1951                 if (sym.kind == VAR) {
1952                     Symbol s = ident.sym = sym;
1953                     ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1954                     ident.type = s.type;
1955                     return ((s.flags_field & Flags.ENUM) == 0)
1956                         ? null : s;
1957                 }
1958             }
1959         }
1960         return null;
1961     }
1962 
1963     public void visitSynchronized(JCSynchronized tree) {
1964         boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1965         if (identityType && isValueBased(tree.lock.type)) {
1966             env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1967         }
1968         attribStat(tree.body, env);
1969         result = null;
1970     }
1971         // where
1972         private boolean isValueBased(Type t) {
1973             return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1974         }
1975 

1976     public void visitTry(JCTry tree) {
1977         // Create a new local environment with a local
1978         Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1979         try {
1980             boolean isTryWithResource = tree.resources.nonEmpty();
1981             // Create a nested environment for attributing the try block if needed
1982             Env<AttrContext> tryEnv = isTryWithResource ?
1983                 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1984                 localEnv;
1985             try {
1986                 // Attribute resource declarations
1987                 for (JCTree resource : tree.resources) {
1988                     CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1989                         @Override
1990                         public void report(DiagnosticPosition pos, JCDiagnostic details) {
1991                             chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1992                         }
1993                     };
1994                     ResultInfo twrResult =
1995                         new ResultInfo(KindSelector.VAR,

4388     }
4389 
4390     public void visitSelect(JCFieldAccess tree) {
4391         // Determine the expected kind of the qualifier expression.
4392         KindSelector skind = KindSelector.NIL;
4393         if (tree.name == names._this || tree.name == names._super ||
4394                 tree.name == names._class)
4395         {
4396             skind = KindSelector.TYP;
4397         } else {
4398             if (pkind().contains(KindSelector.PCK))
4399                 skind = KindSelector.of(skind, KindSelector.PCK);
4400             if (pkind().contains(KindSelector.TYP))
4401                 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4402             if (pkind().contains(KindSelector.VAL_MTH))
4403                 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4404         }
4405 
4406         // Attribute the qualifier expression, and determine its symbol (if any).
4407         Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4408         Assert.check(site == tree.selected.type);
4409         if (!pkind().contains(KindSelector.TYP_PCK))
4410             site = capture(site); // Capture field access
4411 
4412         // don't allow T.class T[].class, etc
4413         if (skind == KindSelector.TYP) {
4414             Type elt = site;
4415             while (elt.hasTag(ARRAY))
4416                 elt = ((ArrayType)elt).elemtype;
4417             if (elt.hasTag(TYPEVAR)) {
4418                 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4419                 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4420                 tree.sym = tree.type.tsym;
4421                 return ;
4422             }
4423         }
4424 
4425         // If qualifier symbol is a type or `super', assert `selectSuper'
4426         // for the selection. This is relevant for determining whether
4427         // protected symbols are accessible.
4428         Symbol sitesym = TreeInfo.symbol(tree.selected);

5487                                                       .filter(s -> s.tsym.isSealed())
5488                                                       .map(s -> (ClassSymbol) s.tsym)
5489                                                       .collect(List.collector());
5490 
5491                 if (sealedSupers.isEmpty()) {
5492                     if ((c.flags_field & Flags.NON_SEALED) != 0) {
5493                         boolean hasErrorSuper = false;
5494 
5495                         hasErrorSuper |= types.directSupertypes(c.type)
5496                                               .stream()
5497                                               .anyMatch(s -> s.tsym.kind == Kind.ERR);
5498 
5499                         ClassType ct = (ClassType) c.type;
5500 
5501                         hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5502 
5503                         if (!hasErrorSuper) {
5504                             log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5505                         }
5506                     }
5507                 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5508                     if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5509                         log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5510                     }
5511 
5512                     if (!c.type.isCompound()) {
5513                         for (ClassSymbol supertypeSym : sealedSupers) {
5514                             if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5515                                 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5516                             }
5517                         }
5518                         if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5519                             log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5520                                     c.isInterface() ?
5521                                             Errors.NonSealedOrSealedExpected :
5522                                             Errors.NonSealedSealedOrFinalExpected);
5523                         }
5524                     }
5525                 }
5526 
5527                 deferredLintHandler.flush(env.tree, env.info.lint);
5528                 env.info.returnResult = null;
5529                 // java.lang.Enum may not be subclassed by a non-enum
5530                 if (st.tsym == syms.enumSym &&
5531                     ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5532                     log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5533 
5534                 // Enums may not be extended by source-level classes
5535                 if (st.tsym != null &&
5536                     ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5537                     ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5538                     log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5539                 }
5540 
5541                 if (rs.isSerializable(c.type)) {
5542                     env.info.isSerializable = true;
5543                 }
5544 
5545                 if (c.isValueClass()) {
5546                     Assert.check(env.tree.hasTag(CLASSDEF));
5547                     chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5548                 }
5549 
5550                 attribClassBody(env, c);
5551 
5552                 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5553                 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5554                 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5555                 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5556 
5557                 if (c.isImplicit()) {
5558                     chk.checkHasMain(env.tree.pos(), c);
5559                 }
5560             } finally {
5561                 env.info.returnResult = prevReturnRes;
5562                 log.useSource(prev);
5563                 chk.setLint(prevLint);
5564             }
5565 
5566         }
5567     }
5568 
5569     public void visitImport(JCImport tree) {

5672                         sym.kind != VAR ||
5673                         sym.getConstValue() == null)
5674                     log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5675             }
5676         }
5677 
5678         // Check for proper placement of super()/this() calls.
5679         chk.checkSuperInitCalls(tree);
5680 
5681         // Check for cycles among non-initial constructors.
5682         chk.checkCyclicConstructors(tree);
5683 
5684         // Check for cycles among annotation elements.
5685         chk.checkNonCyclicElements(tree);
5686 
5687         // Check for proper use of serialVersionUID and other
5688         // serialization-related fields and methods
5689         if (env.info.lint.isEnabled(LintCategory.SERIAL)
5690                 && rs.isSerializable(c.type)
5691                 && !c.isAnonymous()) {
5692             chk.checkSerialStructure(env, tree, c);
5693         }
5694         // Correctly organize the positions of the type annotations
5695         typeAnnotations.organizeTypeAnnotationsBodies(tree);
5696 
5697         // Check type annotations applicability rules
5698         validateTypeAnnotations(tree, false);
5699     }
5700         // where
5701         /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5702         private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5703             for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5704                 if (types.isSameType(al.head.annotationType.type, t))
5705                     return al.head.pos();
5706             }
5707 
5708             return null;
5709         }
5710 
5711     private Type capture(Type type) {
5712         return types.capture(type);
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