107 final Analyzer analyzer;
108 final DeferredAttr deferredAttr;
109 final Check chk;
110 final Flow flow;
111 final MemberEnter memberEnter;
112 final TypeEnter typeEnter;
113 final TreeMaker make;
114 final ConstFold cfolder;
115 final Enter enter;
116 final Target target;
117 final Types types;
118 final Preview preview;
119 final JCDiagnostic.Factory diags;
120 final TypeAnnotations typeAnnotations;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127
128 public static Attr instance(Context context) {
129 Attr instance = context.get(attrKey);
130 if (instance == null)
131 instance = new Attr(context);
132 return instance;
133 }
134
135 @SuppressWarnings("this-escape")
136 protected Attr(Context context) {
137 context.put(attrKey, this);
138
139 names = Names.instance(context);
140 log = Log.instance(context);
141 lintMapper = LintMapper.instance(context);
142 syms = Symtab.instance(context);
143 rs = Resolve.instance(context);
144 operators = Operators.instance(context);
145 chk = Check.instance(context);
146 flow = Flow.instance(context);
147 memberEnter = MemberEnter.instance(context);
148 typeEnter = TypeEnter.instance(context);
149 make = TreeMaker.instance(context);
150 enter = Enter.instance(context);
151 infer = Infer.instance(context);
152 analyzer = Analyzer.instance(context);
153 deferredAttr = DeferredAttr.instance(context);
154 cfolder = ConstFold.instance(context);
155 target = Target.instance(context);
156 types = Types.instance(context);
157 preview = Preview.instance(context);
158 diags = JCDiagnostic.Factory.instance(context);
159 annotate = Annotate.instance(context);
160 typeAnnotations = TypeAnnotations.instance(context);
161 typeEnvs = TypeEnvs.instance(context);
162 dependencies = Dependencies.instance(context);
163 argumentAttr = ArgumentAttr.instance(context);
164 matchBindingsComputer = MatchBindingsComputer.instance(context);
165 attrRecover = AttrRecover.instance(context);
166
167 Options options = Options.instance(context);
168
169 Source source = Source.instance(context);
170 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
171 allowRecords = Feature.RECORDS.allowedInSource(source);
172 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
173 Feature.PATTERN_SWITCH.allowedInSource(source);
174 allowUnconditionalPatternsInstanceOf =
175 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
176 sourceName = source.name;
177 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
178
179 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
180 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
181 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
182 methodAttrInfo = new MethodAttrInfo();
183 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
184 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
185 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
186 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
187 }
188
189 /** Switch: reifiable types in instanceof enabled?
190 */
191 boolean allowReifiableTypesInInstanceof;
192
193 /** Are records allowed
194 */
195 private final boolean allowRecords;
196
197 /** Are patterns in switch allowed
198 */
199 private final boolean allowPatternSwitch;
200
201 /** Are unconditional patterns in instanceof allowed
202 */
203 private final boolean allowUnconditionalPatternsInstanceOf;
204
205 /**
206 * Switch: warn about use of variable before declaration?
207 * RFE: 6425594
208 */
209 boolean useBeforeDeclarationWarning;
210
211 /**
212 * Switch: name of source level; used for error reporting.
213 */
214 String sourceName;
215
216 /** Check kind and type of given tree against protokind and prototype.
217 * If check succeeds, store type in tree and return it.
218 * If check fails, store errType in tree and return it.
219 * No checks are performed if the prototype is a method type.
220 * It is not necessary in this case since we know that kind and type
221 * are correct.
222 *
223 * @param tree The tree whose kind and type is checked
224 * @param found The computed type of the tree
278 owner.kind == VAR || // i.e. we are in a variable initializer
279 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
280 &&
281 v.owner == owner.owner
282 &&
283 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
284 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
285 return isAssignable & !insideCompactConstructor;
286 }
287
288 /** Check that variable can be assigned to.
289 * @param pos The current source code position.
290 * @param v The assigned variable
291 * @param base If the variable is referred to in a Select, the part
292 * to the left of the `.', null otherwise.
293 * @param env The current environment.
294 */
295 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
296 if (v.name == names._this) {
297 log.error(pos, Errors.CantAssignValToThis);
298 return;
299 }
300 if ((v.flags() & FINAL) != 0 &&
301 ((v.flags() & HASINIT) != 0
302 ||
303 !((base == null ||
304 TreeInfo.isThisQualifier(base)) &&
305 isAssignableAsBlankFinal(v, env)))) {
306 if (v.isResourceVariable()) { //TWR resource
307 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
308 } else {
309 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
310 }
311 return;
312 }
313
314 // Check instance field assignments that appear in constructor prologues
315 if (rs.isEarlyReference(env, base, v)) {
316
317 // Field may not be inherited from a superclass
318 if (v.owner != env.enclClass.sym) {
319 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
320 return;
321 }
322
323 // Field may not have an initializer
324 if ((v.flags() & HASINIT) != 0) {
325 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
326 return;
327 }
328 }
329 }
330
331 /** Does tree represent a static reference to an identifier?
332 * It is assumed that tree is either a SELECT or an IDENT.
333 * We have to weed out selects from non-type names here.
334 * @param tree The candidate tree.
335 */
336 boolean isStaticReference(JCTree tree) {
337 if (tree.hasTag(SELECT)) {
338 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
339 if (lsym == null || lsym.kind != TYP) {
340 return false;
341 }
342 }
343 return true;
344 }
345
346 /** Is this symbol a type?
347 */
1102 * - have an accessibility stricter than that of the record type
1103 * - explicitly invoke any other constructor
1104 */
1105 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1106 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1107 log.error(tree,
1108 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1109 Errors.InvalidCanonicalConstructorInRecord(
1110 Fragments.Canonical,
1111 env.enclClass.sym.name,
1112 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1113 ) :
1114 Errors.InvalidCanonicalConstructorInRecord(
1115 Fragments.Canonical,
1116 env.enclClass.sym.name,
1117 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1118 )
1119 );
1120 }
1121
1122 if (TreeInfo.hasAnyConstructorCall(tree)) {
1123 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1124 Fragments.Canonical, env.enclClass.sym.name,
1125 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1126 }
1127 }
1128
1129 // also we want to check that no type variables have been defined
1130 if (!tree.typarams.isEmpty()) {
1131 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1132 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1133 }
1134
1135 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1136 * record components
1137 */
1138 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1139 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1140 for (JCVariableDecl param: tree.params) {
1141 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1142 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1180 if (tree.defaultValue != null) {
1181 if ((owner.flags() & ANNOTATION) == 0)
1182 log.error(tree.pos(),
1183 Errors.DefaultAllowedInIntfAnnotationMember);
1184 }
1185 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1186 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1187 } else {
1188 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1189 if ((owner.flags() & INTERFACE) != 0) {
1190 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1191 } else {
1192 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1193 }
1194 } else if ((tree.mods.flags & NATIVE) != 0) {
1195 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1196 }
1197 // Add an implicit super() call unless an explicit call to
1198 // super(...) or this(...) is given
1199 // or we are compiling class java.lang.Object.
1200 if (isConstructor && owner.type != syms.objectType) {
1201 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1202 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1203 make.Ident(names._super), make.Idents(List.nil())));
1204 tree.body.stats = tree.body.stats.prepend(supCall);
1205 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1206 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1207 TreeInfo.hasConstructorCall(tree, names._super)) {
1208 // enum constructors are not allowed to call super
1209 // directly, so make sure there aren't any super calls
1210 // in enum constructors, except in the compiler
1211 // generated one.
1212 log.error(tree.body.stats.head.pos(),
1213 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1214 }
1215 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1216 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1217 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1218 if (!initParamNames.equals(recordComponentNames)) {
1219 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1220 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1221 }
1222 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1223 log.error(tree,
1224 Errors.InvalidCanonicalConstructorInRecord(
1225 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1226 env.enclClass.sym.name,
1227 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1229 }
1230 }
1231 }
1232
1233 // Attribute all type annotations in the body
1234 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1235 annotate.flush();
1236
1237 // Start of constructor prologue (if not in java.lang.Object constructor)
1238 localEnv.info.ctorPrologue = isConstructor && owner.type != syms.objectType;
1239
1240 // Attribute method body.
1241 attribStat(tree.body, localEnv);
1242 }
1243
1244 localEnv.info.scope.leave();
1245 result = tree.type = m.type;
1246 } finally {
1247 chk.setLint(prevLint);
1248 chk.setMethod(prevMethod);
1249 env.info.ctorPrologue = ctorProloguePrev;
1250 }
1251 }
1252
1253 public void visitVarDef(JCVariableDecl tree) {
1254 // Local variables have not been entered yet, so we need to do it now:
1255 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1256 if (tree.sym != null) {
1257 // parameters have already been entered
1258 env.info.scope.enter(tree.sym);
1259 } else {
1260 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1261 if (tree.init == null) {
1262 //cannot use 'var' without initializer
1263 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1264 tree.vartype = make.Erroneous();
1265 } else {
1266 Fragment msg = canInferLocalVarType(tree);
1267 if (msg != null) {
1268 //cannot use 'var' with initializer which require an explicit target
1269 //(e.g. lambda, method reference, array initializer).
1270 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1271 tree.vartype = make.Erroneous();
1272 }
1293 (tree.sym.flags() & PARAMETER) != 0;
1294 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1295
1296 try {
1297 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1298 chk.checkDeprecatedAnnotation(tree.pos(), v);
1299
1300 if (tree.init != null) {
1301 if ((v.flags_field & FINAL) == 0 ||
1302 !memberEnter.needsLazyConstValue(tree.init)) {
1303 // Not a compile-time constant
1304 // Attribute initializer in a new environment
1305 // with the declared variable as owner.
1306 // Check that initializer conforms to variable's declared type.
1307 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1308 initEnv.info.lint = lint;
1309 // In order to catch self-references, we set the variable's
1310 // declaration position to maximal possible value, effectively
1311 // marking the variable as undefined.
1312 initEnv.info.enclVar = v;
1313 attribExpr(tree.init, initEnv, v.type);
1314 if (tree.isImplicitlyTyped()) {
1315 //fixup local variable type
1316 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1317 }
1318 }
1319 if (tree.isImplicitlyTyped()) {
1320 setSyntheticVariableType(tree, v.type);
1321 }
1322 }
1323 result = tree.type = v.type;
1324 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1325 if (isNonArgsMethodInObject(v.name)) {
1326 log.error(tree, Errors.IllegalRecordComponentName(v));
1327 }
1328 }
1329 chk.checkRequiresIdentity(tree, env.info.lint);
1330 }
1331 finally {
1332 chk.setLint(prevLint);
1333 }
1334 }
1335
1336 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1417 }
1418 }
1419 }
1420
1421 public void visitSkip(JCSkip tree) {
1422 result = null;
1423 }
1424
1425 public void visitBlock(JCBlock tree) {
1426 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1427 // Block is a static or instance initializer;
1428 // let the owner of the environment be a freshly
1429 // created BLOCK-method.
1430 Symbol fakeOwner =
1431 new MethodSymbol(tree.flags | BLOCK |
1432 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1433 env.info.scope.owner);
1434 final Env<AttrContext> localEnv =
1435 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1436
1437 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1438 // Attribute all type annotations in the block
1439 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1440 annotate.flush();
1441 attribStats(tree.stats, localEnv);
1442
1443 {
1444 // Store init and clinit type annotations with the ClassSymbol
1445 // to allow output in Gen.normalizeDefs.
1446 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1447 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1448 if ((tree.flags & STATIC) != 0) {
1449 cs.appendClassInitTypeAttributes(tas);
1450 } else {
1451 cs.appendInitTypeAttributes(tas);
1452 }
1453 }
1454 } else {
1455 // Create a new local environment with a local scope.
1456 Env<AttrContext> localEnv =
1457 env.dup(tree, env.info.dup(env.info.scope.dup()));
1930 // where
1931 /** Return the selected enumeration constant symbol, or null. */
1932 private Symbol enumConstant(JCTree tree, Type enumType) {
1933 if (tree.hasTag(IDENT)) {
1934 JCIdent ident = (JCIdent)tree;
1935 Name name = ident.name;
1936 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1937 if (sym.kind == VAR) {
1938 Symbol s = ident.sym = sym;
1939 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1940 ident.type = s.type;
1941 return ((s.flags_field & Flags.ENUM) == 0)
1942 ? null : s;
1943 }
1944 }
1945 }
1946 return null;
1947 }
1948
1949 public void visitSynchronized(JCSynchronized tree) {
1950 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1951 if (tree.lock.type != null && tree.lock.type.isValueBased()) {
1952 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1953 }
1954 attribStat(tree.body, env);
1955 result = null;
1956 }
1957
1958 public void visitTry(JCTry tree) {
1959 // Create a new local environment with a local
1960 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1961 try {
1962 boolean isTryWithResource = tree.resources.nonEmpty();
1963 // Create a nested environment for attributing the try block if needed
1964 Env<AttrContext> tryEnv = isTryWithResource ?
1965 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1966 localEnv;
1967 try {
1968 // Attribute resource declarations
1969 for (JCTree resource : tree.resources) {
1970 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1971 @Override
4383 }
4384
4385 public void visitSelect(JCFieldAccess tree) {
4386 // Determine the expected kind of the qualifier expression.
4387 KindSelector skind = KindSelector.NIL;
4388 if (tree.name == names._this || tree.name == names._super ||
4389 tree.name == names._class)
4390 {
4391 skind = KindSelector.TYP;
4392 } else {
4393 if (pkind().contains(KindSelector.PCK))
4394 skind = KindSelector.of(skind, KindSelector.PCK);
4395 if (pkind().contains(KindSelector.TYP))
4396 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4397 if (pkind().contains(KindSelector.VAL_MTH))
4398 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4399 }
4400
4401 // Attribute the qualifier expression, and determine its symbol (if any).
4402 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4403 if (!pkind().contains(KindSelector.TYP_PCK))
4404 site = capture(site); // Capture field access
4405
4406 // don't allow T.class T[].class, etc
4407 if (skind == KindSelector.TYP) {
4408 Type elt = site;
4409 while (elt.hasTag(ARRAY))
4410 elt = ((ArrayType)elt).elemtype;
4411 if (elt.hasTag(TYPEVAR)) {
4412 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4413 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4414 tree.sym = tree.type.tsym;
4415 return ;
4416 }
4417 }
4418
4419 // If qualifier symbol is a type or `super', assert `selectSuper'
4420 // for the selection. This is relevant for determining whether
4421 // protected symbols are accessible.
4422 Symbol sitesym = TreeInfo.symbol(tree.selected);
5485 .filter(s -> s.tsym.isSealed())
5486 .map(s -> (ClassSymbol) s.tsym)
5487 .collect(List.collector());
5488
5489 if (sealedSupers.isEmpty()) {
5490 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5491 boolean hasErrorSuper = false;
5492
5493 hasErrorSuper |= types.directSupertypes(c.type)
5494 .stream()
5495 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5496
5497 ClassType ct = (ClassType) c.type;
5498
5499 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5500
5501 if (!hasErrorSuper) {
5502 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5503 }
5504 }
5505 } else {
5506 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5507 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5508 }
5509
5510 if (!c.type.isCompound()) {
5511 for (ClassSymbol supertypeSym : sealedSupers) {
5512 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5513 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5514 }
5515 }
5516 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5517 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5518 c.isInterface() ?
5519 Errors.NonSealedOrSealedExpected :
5520 Errors.NonSealedSealedOrFinalExpected);
5521 }
5522 }
5523 }
5524
5525 env.info.returnResult = null;
5526 // java.lang.Enum may not be subclassed by a non-enum
5527 if (st.tsym == syms.enumSym &&
5528 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5529 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5530
5531 // Enums may not be extended by source-level classes
5532 if (st.tsym != null &&
5533 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5534 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5535 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5536 }
5537
5538 if (rs.isSerializable(c.type)) {
5539 env.info.isSerializable = true;
5540 }
5541
5542 attribClassBody(env, c);
5543
5544 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5545 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5546 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5547 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5548
5549 if (c.isImplicit()) {
5550 chk.checkHasMain(env.tree.pos(), c);
5551 }
5552 } finally {
5553 env.info.returnResult = prevReturnRes;
5554 log.useSource(prev);
5555 chk.setLint(prevLint);
5556 }
5557
5558 }
5559 }
5560
5561 public void visitImport(JCImport tree) {
5664 sym.kind != VAR ||
5665 sym.getConstValue() == null)
5666 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5667 }
5668 }
5669
5670 // Check for proper placement of super()/this() calls.
5671 chk.checkSuperInitCalls(tree);
5672
5673 // Check for cycles among non-initial constructors.
5674 chk.checkCyclicConstructors(tree);
5675
5676 // Check for cycles among annotation elements.
5677 chk.checkNonCyclicElements(tree);
5678
5679 // Check for proper use of serialVersionUID and other
5680 // serialization-related fields and methods
5681 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5682 && rs.isSerializable(c.type)
5683 && !c.isAnonymous()) {
5684 chk.checkSerialStructure(tree, c);
5685 }
5686 // Correctly organize the positions of the type annotations
5687 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5688
5689 // Check type annotations applicability rules
5690 validateTypeAnnotations(tree, false);
5691 }
5692 // where
5693 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5694 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5695 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5696 if (types.isSameType(al.head.annotationType.type, t))
5697 return al.head.pos();
5698 }
5699
5700 return null;
5701 }
5702
5703 private Type capture(Type type) {
5704 return types.capture(type);
|
107 final Analyzer analyzer;
108 final DeferredAttr deferredAttr;
109 final Check chk;
110 final Flow flow;
111 final MemberEnter memberEnter;
112 final TypeEnter typeEnter;
113 final TreeMaker make;
114 final ConstFold cfolder;
115 final Enter enter;
116 final Target target;
117 final Types types;
118 final Preview preview;
119 final JCDiagnostic.Factory diags;
120 final TypeAnnotations typeAnnotations;
121 final TypeEnvs typeEnvs;
122 final Dependencies dependencies;
123 final Annotate annotate;
124 final ArgumentAttr argumentAttr;
125 final MatchBindingsComputer matchBindingsComputer;
126 final AttrRecover attrRecover;
127 final LocalProxyVarsGen localProxyVarsGen;
128
129 public static Attr instance(Context context) {
130 Attr instance = context.get(attrKey);
131 if (instance == null)
132 instance = new Attr(context);
133 return instance;
134 }
135
136 @SuppressWarnings("this-escape")
137 protected Attr(Context context) {
138 context.put(attrKey, this);
139
140 names = Names.instance(context);
141 log = Log.instance(context);
142 lintMapper = LintMapper.instance(context);
143 syms = Symtab.instance(context);
144 rs = Resolve.instance(context);
145 operators = Operators.instance(context);
146 chk = Check.instance(context);
147 flow = Flow.instance(context);
148 memberEnter = MemberEnter.instance(context);
149 typeEnter = TypeEnter.instance(context);
150 make = TreeMaker.instance(context);
151 enter = Enter.instance(context);
152 infer = Infer.instance(context);
153 analyzer = Analyzer.instance(context);
154 deferredAttr = DeferredAttr.instance(context);
155 cfolder = ConstFold.instance(context);
156 target = Target.instance(context);
157 types = Types.instance(context);
158 preview = Preview.instance(context);
159 diags = JCDiagnostic.Factory.instance(context);
160 annotate = Annotate.instance(context);
161 typeAnnotations = TypeAnnotations.instance(context);
162 typeEnvs = TypeEnvs.instance(context);
163 dependencies = Dependencies.instance(context);
164 argumentAttr = ArgumentAttr.instance(context);
165 matchBindingsComputer = MatchBindingsComputer.instance(context);
166 attrRecover = AttrRecover.instance(context);
167 localProxyVarsGen = LocalProxyVarsGen.instance(context);
168
169 Options options = Options.instance(context);
170
171 Source source = Source.instance(context);
172 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
173 allowRecords = Feature.RECORDS.allowedInSource(source);
174 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
175 Feature.PATTERN_SWITCH.allowedInSource(source);
176 allowUnconditionalPatternsInstanceOf =
177 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
178 sourceName = source.name;
179 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
180
181 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
182 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
183 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
184 methodAttrInfo = new MethodAttrInfo();
185 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
186 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
187 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
188 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
189 allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
190 Feature.VALUE_CLASSES.allowedInSource(source);
191 }
192
193 /** Switch: reifiable types in instanceof enabled?
194 */
195 boolean allowReifiableTypesInInstanceof;
196
197 /** Are records allowed
198 */
199 private final boolean allowRecords;
200
201 /** Are patterns in switch allowed
202 */
203 private final boolean allowPatternSwitch;
204
205 /** Are unconditional patterns in instanceof allowed
206 */
207 private final boolean allowUnconditionalPatternsInstanceOf;
208
209 /** Are value classes allowed
210 */
211 private final boolean allowValueClasses;
212
213 /**
214 * Switch: warn about use of variable before declaration?
215 * RFE: 6425594
216 */
217 boolean useBeforeDeclarationWarning;
218
219 /**
220 * Switch: name of source level; used for error reporting.
221 */
222 String sourceName;
223
224 /** Check kind and type of given tree against protokind and prototype.
225 * If check succeeds, store type in tree and return it.
226 * If check fails, store errType in tree and return it.
227 * No checks are performed if the prototype is a method type.
228 * It is not necessary in this case since we know that kind and type
229 * are correct.
230 *
231 * @param tree The tree whose kind and type is checked
232 * @param found The computed type of the tree
286 owner.kind == VAR || // i.e. we are in a variable initializer
287 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
288 &&
289 v.owner == owner.owner
290 &&
291 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
292 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
293 return isAssignable & !insideCompactConstructor;
294 }
295
296 /** Check that variable can be assigned to.
297 * @param pos The current source code position.
298 * @param v The assigned variable
299 * @param base If the variable is referred to in a Select, the part
300 * to the left of the `.', null otherwise.
301 * @param env The current environment.
302 */
303 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
304 if (v.name == names._this) {
305 log.error(pos, Errors.CantAssignValToThis);
306 } else if ((v.flags() & FINAL) != 0 &&
307 ((v.flags() & HASINIT) != 0
308 ||
309 !((base == null ||
310 TreeInfo.isThisQualifier(base)) &&
311 isAssignableAsBlankFinal(v, env)))) {
312 if (v.isResourceVariable()) { //TWR resource
313 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
314 } else {
315 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
316 }
317 }
318 }
319
320 /** Does tree represent a static reference to an identifier?
321 * It is assumed that tree is either a SELECT or an IDENT.
322 * We have to weed out selects from non-type names here.
323 * @param tree The candidate tree.
324 */
325 boolean isStaticReference(JCTree tree) {
326 if (tree.hasTag(SELECT)) {
327 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
328 if (lsym == null || lsym.kind != TYP) {
329 return false;
330 }
331 }
332 return true;
333 }
334
335 /** Is this symbol a type?
336 */
1091 * - have an accessibility stricter than that of the record type
1092 * - explicitly invoke any other constructor
1093 */
1094 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1095 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1096 log.error(tree,
1097 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1098 Errors.InvalidCanonicalConstructorInRecord(
1099 Fragments.Canonical,
1100 env.enclClass.sym.name,
1101 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1102 ) :
1103 Errors.InvalidCanonicalConstructorInRecord(
1104 Fragments.Canonical,
1105 env.enclClass.sym.name,
1106 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1107 )
1108 );
1109 }
1110
1111 if (!allowValueClasses && TreeInfo.hasAnyConstructorCall(tree)) {
1112 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1113 Fragments.Canonical, env.enclClass.sym.name,
1114 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1115 }
1116 }
1117
1118 // also we want to check that no type variables have been defined
1119 if (!tree.typarams.isEmpty()) {
1120 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1121 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1122 }
1123
1124 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1125 * record components
1126 */
1127 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1128 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1129 for (JCVariableDecl param: tree.params) {
1130 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1131 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1169 if (tree.defaultValue != null) {
1170 if ((owner.flags() & ANNOTATION) == 0)
1171 log.error(tree.pos(),
1172 Errors.DefaultAllowedInIntfAnnotationMember);
1173 }
1174 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1175 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1176 } else {
1177 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1178 if ((owner.flags() & INTERFACE) != 0) {
1179 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1180 } else {
1181 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1182 }
1183 } else if ((tree.mods.flags & NATIVE) != 0) {
1184 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1185 }
1186 // Add an implicit super() call unless an explicit call to
1187 // super(...) or this(...) is given
1188 // or we are compiling class java.lang.Object.
1189 boolean addedSuperInIdentityClass = false;
1190 if (isConstructor && owner.type != syms.objectType) {
1191 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1192 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1193 make.Ident(names._super), make.Idents(List.nil())));
1194 if (allowValueClasses && (owner.isValueClass() || owner.hasStrict() || ((owner.flags_field & RECORD) != 0))) {
1195 tree.body.stats = tree.body.stats.append(supCall);
1196 } else {
1197 tree.body.stats = tree.body.stats.prepend(supCall);
1198 addedSuperInIdentityClass = true;
1199 }
1200 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1201 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1202 TreeInfo.hasConstructorCall(tree, names._super)) {
1203 // enum constructors are not allowed to call super
1204 // directly, so make sure there aren't any super calls
1205 // in enum constructors, except in the compiler
1206 // generated one.
1207 log.error(tree.body.stats.head.pos(),
1208 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1209 }
1210 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1211 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1212 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1213 if (!initParamNames.equals(recordComponentNames)) {
1214 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1215 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1216 }
1217 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1218 log.error(tree,
1219 Errors.InvalidCanonicalConstructorInRecord(
1220 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1221 env.enclClass.sym.name,
1222 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1223 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1224 }
1225 }
1226 }
1227
1228 // Attribute all type annotations in the body
1229 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1230 annotate.flush();
1231
1232 // Start of constructor prologue (if not in java.lang.Object constructor)
1233 localEnv.info.ctorPrologue = isConstructor && owner.type != syms.objectType;
1234
1235 // Attribute method body.
1236 attribStat(tree.body, localEnv);
1237 if (localEnv.info.ctorPrologue) {
1238 boolean thisInvocation = false;
1239 ListBuffer<JCTree> prologueCode = new ListBuffer<>();
1240 for (JCTree stat : tree.body.stats) {
1241 prologueCode.add(stat);
1242 /* gather all the stats in the body until a `super` or `this` constructor invocation is found,
1243 * including the constructor invocation, that way we don't need to worry in the visitor below if
1244 * if we are dealing or not with prologue code
1245 */
1246 if (stat instanceof JCExpressionStatement expStmt &&
1247 expStmt.expr instanceof JCMethodInvocation mi &&
1248 TreeInfo.isConstructorCall(mi)) {
1249 thisInvocation = TreeInfo.name(mi.meth) == names._this;
1250 if (!addedSuperInIdentityClass || !allowValueClasses) {
1251 break;
1252 }
1253 }
1254 }
1255 if (!prologueCode.isEmpty()) {
1256 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(localEnv,
1257 addedSuperInIdentityClass && allowValueClasses ?
1258 PrologueVisitorMode.WARNINGS_ONLY :
1259 thisInvocation ?
1260 PrologueVisitorMode.THIS_CONSTRUCTOR :
1261 PrologueVisitorMode.SUPER_CONSTRUCTOR);
1262 ctorPrologueVisitor.scan(prologueCode.toList());
1263 }
1264 }
1265 }
1266
1267 localEnv.info.scope.leave();
1268 result = tree.type = m.type;
1269 } finally {
1270 chk.setLint(prevLint);
1271 chk.setMethod(prevMethod);
1272 env.info.ctorPrologue = ctorProloguePrev;
1273 }
1274 }
1275
1276 enum PrologueVisitorMode {
1277 WARNINGS_ONLY,
1278 SUPER_CONSTRUCTOR,
1279 THIS_CONSTRUCTOR
1280 }
1281
1282 class CtorPrologueVisitor extends TreeScanner {
1283 Env<AttrContext> localEnv;
1284 PrologueVisitorMode mode;
1285
1286 CtorPrologueVisitor(Env<AttrContext> localEnv, PrologueVisitorMode mode) {
1287 this.localEnv = localEnv;
1288 currentClassSym = localEnv.enclClass.sym;
1289 this.mode = mode;
1290 }
1291
1292 boolean insideLambdaOrClassDef = false;
1293
1294 @Override
1295 public void visitLambda(JCLambda lambda) {
1296 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1297 try {
1298 insideLambdaOrClassDef = true;
1299 super.visitLambda(lambda);
1300 } finally {
1301 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1302 }
1303 }
1304
1305 ClassSymbol currentClassSym;
1306
1307 @Override
1308 public void visitClassDef(JCClassDecl classDecl) {
1309 boolean previousInsideLambdaOrClassDef = insideLambdaOrClassDef;
1310 ClassSymbol previousClassSym = currentClassSym;
1311 try {
1312 insideLambdaOrClassDef = true;
1313 currentClassSym = classDecl.sym;
1314 super.visitClassDef(classDecl);
1315 } finally {
1316 insideLambdaOrClassDef = previousInsideLambdaOrClassDef;
1317 currentClassSym = previousClassSym;
1318 }
1319 }
1320
1321 private void reportPrologueError(JCTree tree, Symbol sym) {
1322 reportPrologueError(tree, sym, false);
1323 }
1324
1325 private void reportPrologueError(JCTree tree, Symbol sym, boolean hasInit) {
1326 preview.checkSourceLevel(tree, Feature.FLEXIBLE_CONSTRUCTORS);
1327 if (mode != PrologueVisitorMode.WARNINGS_ONLY) {
1328 if (hasInit) {
1329 log.error(tree, Errors.CantAssignInitializedBeforeCtorCalled(sym));
1330 } else {
1331 log.error(tree, Errors.CantRefBeforeCtorCalled(sym));
1332 }
1333 } else if (allowValueClasses) {
1334 // issue lint warning
1335 log.warning(tree, LintWarnings.WouldNotBeAllowedInPrologue(sym));
1336 }
1337 }
1338
1339 @Override
1340 public void visitApply(JCMethodInvocation tree) {
1341 super.visitApply(tree);
1342 Name name = TreeInfo.name(tree.meth);
1343 boolean isConstructorCall = name == names._this || name == names._super;
1344 Symbol msym = TreeInfo.symbolFor(tree.meth);
1345 // is this an instance method call or an illegal constructor invocation like: `this.super()`?
1346 if (msym != null && // for erroneous invocations msym can be null, ignore those
1347 (!isConstructorCall ||
1348 isConstructorCall && tree.meth.hasTag(SELECT))) {
1349 if (isEarlyReference(localEnv, tree.meth, msym))
1350 reportPrologueError(tree.meth, msym);
1351 }
1352 }
1353
1354 @Override
1355 public void visitIdent(JCIdent tree) {
1356 analyzeSymbol(tree);
1357 }
1358
1359 @Override
1360 public void visitSelect(JCFieldAccess tree) {
1361 SelectScanner ss = new SelectScanner();
1362 ss.scan(tree);
1363 if (ss.scanLater == null) {
1364 analyzeSymbol(tree);
1365 } else {
1366 boolean prevLhs = isInLHS;
1367 try {
1368 isInLHS = false;
1369 scan(ss.scanLater);
1370 } finally {
1371 isInLHS = prevLhs;
1372 }
1373 }
1374 }
1375
1376 @Override
1377 public void visitNewClass(JCNewClass tree) {
1378 super.visitNewClass(tree);
1379 checkNewClassAndMethRefs(tree, tree.type);
1380 }
1381
1382 @Override
1383 public void visitReference(JCMemberReference tree) {
1384 super.visitReference(tree);
1385 if (tree.getMode() == JCMemberReference.ReferenceMode.NEW) {
1386 checkNewClassAndMethRefs(tree, tree.expr.type);
1387 }
1388 }
1389
1390 void checkNewClassAndMethRefs(JCTree tree, Type t) {
1391 if (t.tsym.isEnclosedBy(localEnv.enclClass.sym) &&
1392 !t.tsym.isStatic() &&
1393 !t.tsym.isDirectlyOrIndirectlyLocal()) {
1394 reportPrologueError(tree, t.getEnclosingType().tsym);
1395 }
1396 }
1397
1398 /* if a symbol is in the LHS of an assignment expression we won't consider it as a candidate
1399 * for a proxy local variable later on
1400 */
1401 boolean isInLHS = false;
1402
1403 @Override
1404 public void visitAssign(JCAssign tree) {
1405 boolean previousIsInLHS = isInLHS;
1406 try {
1407 isInLHS = true;
1408 scan(tree.lhs);
1409 } finally {
1410 isInLHS = previousIsInLHS;
1411 }
1412 scan(tree.rhs);
1413 }
1414
1415 @Override
1416 public void visitMethodDef(JCMethodDecl tree) {
1417 // ignore any declarative part, mainly to avoid scanning receiver parameters
1418 scan(tree.body);
1419 }
1420
1421 void analyzeSymbol(JCTree tree) {
1422 Symbol sym = TreeInfo.symbolFor(tree);
1423 // make sure that there is a symbol and it is not static
1424 if (sym == null || sym.isStatic()) {
1425 return;
1426 }
1427 if (isInLHS && !insideLambdaOrClassDef) {
1428 // Check instance field assignments that appear in constructor prologues
1429 if (isEarlyReference(localEnv, tree, sym)) {
1430 // Field may not be inherited from a superclass
1431 if (sym.owner != localEnv.enclClass.sym) {
1432 reportPrologueError(tree, sym);
1433 return;
1434 }
1435 // Field may not have an initializer
1436 if ((sym.flags() & HASINIT) != 0) {
1437 reportPrologueError(tree, sym, true);
1438 return;
1439 }
1440 // cant reference an instance field before a this constructor
1441 if (allowValueClasses && mode == PrologueVisitorMode.THIS_CONSTRUCTOR) {
1442 reportPrologueError(tree, sym);
1443 return;
1444 }
1445 }
1446 return;
1447 }
1448 tree = TreeInfo.skipParens(tree);
1449 if (sym.kind == VAR && sym.owner.kind == TYP) {
1450 if (sym.name == names._this || sym.name == names._super) {
1451 // are we seeing something like `this` or `CurrentClass.this` or `SuperClass.super::foo`?
1452 if (TreeInfo.isExplicitThisReference(
1453 types,
1454 (ClassType)localEnv.enclClass.sym.type,
1455 tree)) {
1456 reportPrologueError(tree, sym);
1457 }
1458 } else if (sym.kind == VAR && sym.owner.kind == TYP) { // now fields only
1459 if (sym.owner != localEnv.enclClass.sym) {
1460 if (localEnv.enclClass.sym.isSubClass(sym.owner, types) &&
1461 sym.isInheritedIn(localEnv.enclClass.sym, types)) {
1462 /* if we are dealing with a field that doesn't belong to the current class, but the
1463 * field is inherited, this is an error. Unless, the super class is also an outer
1464 * class and the field's qualifier refers to the outer class
1465 */
1466 if (tree.hasTag(IDENT) ||
1467 TreeInfo.isExplicitThisReference(
1468 types,
1469 (ClassType)localEnv.enclClass.sym.type,
1470 ((JCFieldAccess)tree).selected)) {
1471 reportPrologueError(tree, sym);
1472 }
1473 }
1474 } else if (isEarlyReference(localEnv, tree, sym)) {
1475 /* now this is a `proper` instance field of the current class
1476 * references to fields of identity classes which happen to have initializers are
1477 * not allowed in the prologue
1478 */
1479 if (insideLambdaOrClassDef ||
1480 (!localEnv.enclClass.sym.isValueClass() && (sym.flags_field & HASINIT) != 0))
1481 reportPrologueError(tree, sym);
1482 // we will need to generate a proxy for this field later on
1483 if (!isInLHS) {
1484 if (!allowValueClasses) {
1485 reportPrologueError(tree, sym);
1486 } else {
1487 if (mode == PrologueVisitorMode.THIS_CONSTRUCTOR) {
1488 reportPrologueError(tree, sym);
1489 } else if (mode == PrologueVisitorMode.SUPER_CONSTRUCTOR) {
1490 localProxyVarsGen.addFieldReadInPrologue(localEnv.enclMethod, sym);
1491 }
1492 /* we do nothing in warnings only mode, as in that mode we are simulating what
1493 * the compiler would do in case the constructor code would be in the prologue
1494 * phase
1495 */
1496 }
1497 }
1498 }
1499 }
1500 }
1501 }
1502
1503 /**
1504 * Determine if the symbol appearance constitutes an early reference to the current class.
1505 *
1506 * <p>
1507 * This means the symbol is an instance field, or method, of the current class and it appears
1508 * in an early initialization context of it (i.e., one of its constructor prologues).
1509 *
1510 * @param env The current environment
1511 * @param tree the AST referencing the variable
1512 * @param sym The symbol
1513 */
1514 private boolean isEarlyReference(Env<AttrContext> env, JCTree tree, Symbol sym) {
1515 if ((sym.flags() & STATIC) == 0 &&
1516 (sym.kind == VAR || sym.kind == MTH) &&
1517 sym.isMemberOf(env.enclClass.sym, types)) {
1518 // Allow "Foo.this.x" when "Foo" is (also) an outer class, as this refers to the outer instance
1519 if (tree instanceof JCFieldAccess fa) {
1520 return TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, fa.selected);
1521 } else if (currentClassSym != env.enclClass.sym) {
1522 /* so we are inside a class, CI, in the prologue of an outer class, CO, and the symbol being
1523 * analyzed has no qualifier. So if the symbol is a member of CI the reference is allowed,
1524 * otherwise it is not.
1525 * It could be that the reference to CI's member happens inside CI's own prologue, but that
1526 * will be checked separately, when CI's prologue is analyzed.
1527 */
1528 return !sym.isMemberOf(currentClassSym, types);
1529 }
1530 return true;
1531 }
1532 return false;
1533 }
1534
1535 /* scanner for a select expression, anything that is not a select or identifier
1536 * will be stored for further analysis
1537 */
1538 class SelectScanner extends DeferredAttr.FilterScanner {
1539 JCTree scanLater;
1540
1541 SelectScanner() {
1542 super(Set.of(IDENT, SELECT, PARENS));
1543 }
1544
1545 @Override
1546 void skip(JCTree tree) {
1547 scanLater = tree;
1548 }
1549 }
1550 }
1551
1552 public void visitVarDef(JCVariableDecl tree) {
1553 // Local variables have not been entered yet, so we need to do it now:
1554 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1555 if (tree.sym != null) {
1556 // parameters have already been entered
1557 env.info.scope.enter(tree.sym);
1558 } else {
1559 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1560 if (tree.init == null) {
1561 //cannot use 'var' without initializer
1562 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1563 tree.vartype = make.Erroneous();
1564 } else {
1565 Fragment msg = canInferLocalVarType(tree);
1566 if (msg != null) {
1567 //cannot use 'var' with initializer which require an explicit target
1568 //(e.g. lambda, method reference, array initializer).
1569 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1570 tree.vartype = make.Erroneous();
1571 }
1592 (tree.sym.flags() & PARAMETER) != 0;
1593 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1594
1595 try {
1596 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1597 chk.checkDeprecatedAnnotation(tree.pos(), v);
1598
1599 if (tree.init != null) {
1600 if ((v.flags_field & FINAL) == 0 ||
1601 !memberEnter.needsLazyConstValue(tree.init)) {
1602 // Not a compile-time constant
1603 // Attribute initializer in a new environment
1604 // with the declared variable as owner.
1605 // Check that initializer conforms to variable's declared type.
1606 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1607 initEnv.info.lint = lint;
1608 // In order to catch self-references, we set the variable's
1609 // declaration position to maximal possible value, effectively
1610 // marking the variable as undefined.
1611 initEnv.info.enclVar = v;
1612 boolean previousCtorPrologue = initEnv.info.ctorPrologue;
1613 try {
1614 if (v.owner.kind == TYP && !v.isStatic() && v.isStrict()) {
1615 // strict instance initializer in a value class
1616 initEnv.info.ctorPrologue = true;
1617 }
1618 attribExpr(tree.init, initEnv, v.type);
1619 if (tree.isImplicitlyTyped()) {
1620 //fixup local variable type
1621 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1622 }
1623 if (allowValueClasses && v.owner.kind == TYP && !v.isStatic()) {
1624 // strict field initializers are inlined in constructor's prologues
1625 CtorPrologueVisitor ctorPrologueVisitor = new CtorPrologueVisitor(initEnv,
1626 !v.isStrict() ? PrologueVisitorMode.WARNINGS_ONLY : PrologueVisitorMode.SUPER_CONSTRUCTOR);
1627 ctorPrologueVisitor.scan(tree.init);
1628 }
1629 } finally {
1630 initEnv.info.ctorPrologue = previousCtorPrologue;
1631 }
1632 }
1633 if (tree.isImplicitlyTyped()) {
1634 setSyntheticVariableType(tree, v.type);
1635 }
1636 }
1637 result = tree.type = v.type;
1638 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1639 if (isNonArgsMethodInObject(v.name)) {
1640 log.error(tree, Errors.IllegalRecordComponentName(v));
1641 }
1642 }
1643 chk.checkRequiresIdentity(tree, env.info.lint);
1644 }
1645 finally {
1646 chk.setLint(prevLint);
1647 }
1648 }
1649
1650 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1731 }
1732 }
1733 }
1734
1735 public void visitSkip(JCSkip tree) {
1736 result = null;
1737 }
1738
1739 public void visitBlock(JCBlock tree) {
1740 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1741 // Block is a static or instance initializer;
1742 // let the owner of the environment be a freshly
1743 // created BLOCK-method.
1744 Symbol fakeOwner =
1745 new MethodSymbol(tree.flags | BLOCK |
1746 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1747 env.info.scope.owner);
1748 final Env<AttrContext> localEnv =
1749 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1750
1751 if ((tree.flags & STATIC) != 0) {
1752 localEnv.info.staticLevel++;
1753 } else {
1754 localEnv.info.instanceInitializerBlock = true;
1755 }
1756 // Attribute all type annotations in the block
1757 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1758 annotate.flush();
1759 attribStats(tree.stats, localEnv);
1760
1761 {
1762 // Store init and clinit type annotations with the ClassSymbol
1763 // to allow output in Gen.normalizeDefs.
1764 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1765 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1766 if ((tree.flags & STATIC) != 0) {
1767 cs.appendClassInitTypeAttributes(tas);
1768 } else {
1769 cs.appendInitTypeAttributes(tas);
1770 }
1771 }
1772 } else {
1773 // Create a new local environment with a local scope.
1774 Env<AttrContext> localEnv =
1775 env.dup(tree, env.info.dup(env.info.scope.dup()));
2248 // where
2249 /** Return the selected enumeration constant symbol, or null. */
2250 private Symbol enumConstant(JCTree tree, Type enumType) {
2251 if (tree.hasTag(IDENT)) {
2252 JCIdent ident = (JCIdent)tree;
2253 Name name = ident.name;
2254 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
2255 if (sym.kind == VAR) {
2256 Symbol s = ident.sym = sym;
2257 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
2258 ident.type = s.type;
2259 return ((s.flags_field & Flags.ENUM) == 0)
2260 ? null : s;
2261 }
2262 }
2263 }
2264 return null;
2265 }
2266
2267 public void visitSynchronized(JCSynchronized tree) {
2268 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
2269 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
2270 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
2271 }
2272 attribStat(tree.body, env);
2273 result = null;
2274 }
2275
2276 public void visitTry(JCTry tree) {
2277 // Create a new local environment with a local
2278 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
2279 try {
2280 boolean isTryWithResource = tree.resources.nonEmpty();
2281 // Create a nested environment for attributing the try block if needed
2282 Env<AttrContext> tryEnv = isTryWithResource ?
2283 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2284 localEnv;
2285 try {
2286 // Attribute resource declarations
2287 for (JCTree resource : tree.resources) {
2288 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
2289 @Override
4701 }
4702
4703 public void visitSelect(JCFieldAccess tree) {
4704 // Determine the expected kind of the qualifier expression.
4705 KindSelector skind = KindSelector.NIL;
4706 if (tree.name == names._this || tree.name == names._super ||
4707 tree.name == names._class)
4708 {
4709 skind = KindSelector.TYP;
4710 } else {
4711 if (pkind().contains(KindSelector.PCK))
4712 skind = KindSelector.of(skind, KindSelector.PCK);
4713 if (pkind().contains(KindSelector.TYP))
4714 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4715 if (pkind().contains(KindSelector.VAL_MTH))
4716 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4717 }
4718
4719 // Attribute the qualifier expression, and determine its symbol (if any).
4720 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4721 Assert.check(site == tree.selected.type);
4722 if (!pkind().contains(KindSelector.TYP_PCK))
4723 site = capture(site); // Capture field access
4724
4725 // don't allow T.class T[].class, etc
4726 if (skind == KindSelector.TYP) {
4727 Type elt = site;
4728 while (elt.hasTag(ARRAY))
4729 elt = ((ArrayType)elt).elemtype;
4730 if (elt.hasTag(TYPEVAR)) {
4731 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4732 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4733 tree.sym = tree.type.tsym;
4734 return ;
4735 }
4736 }
4737
4738 // If qualifier symbol is a type or `super', assert `selectSuper'
4739 // for the selection. This is relevant for determining whether
4740 // protected symbols are accessible.
4741 Symbol sitesym = TreeInfo.symbol(tree.selected);
5804 .filter(s -> s.tsym.isSealed())
5805 .map(s -> (ClassSymbol) s.tsym)
5806 .collect(List.collector());
5807
5808 if (sealedSupers.isEmpty()) {
5809 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5810 boolean hasErrorSuper = false;
5811
5812 hasErrorSuper |= types.directSupertypes(c.type)
5813 .stream()
5814 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5815
5816 ClassType ct = (ClassType) c.type;
5817
5818 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5819
5820 if (!hasErrorSuper) {
5821 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5822 }
5823 }
5824 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5825 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5826 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5827 }
5828
5829 if (!c.type.isCompound()) {
5830 for (ClassSymbol supertypeSym : sealedSupers) {
5831 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5832 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5833 }
5834 }
5835 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5836 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5837 c.isInterface() ?
5838 Errors.NonSealedOrSealedExpected :
5839 Errors.NonSealedSealedOrFinalExpected);
5840 }
5841 }
5842 }
5843
5844 env.info.returnResult = null;
5845 // java.lang.Enum may not be subclassed by a non-enum
5846 if (st.tsym == syms.enumSym &&
5847 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5848 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5849
5850 // Enums may not be extended by source-level classes
5851 if (st.tsym != null &&
5852 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5853 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5854 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5855 }
5856
5857 if (rs.isSerializable(c.type)) {
5858 env.info.isSerializable = true;
5859 }
5860
5861 if (c.isValueClass()) {
5862 Assert.check(env.tree.hasTag(CLASSDEF));
5863 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c);
5864 }
5865
5866 attribClassBody(env, c);
5867
5868 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5869 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5870 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5871 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5872
5873 if (c.isImplicit()) {
5874 chk.checkHasMain(env.tree.pos(), c);
5875 }
5876 } finally {
5877 env.info.returnResult = prevReturnRes;
5878 log.useSource(prev);
5879 chk.setLint(prevLint);
5880 }
5881
5882 }
5883 }
5884
5885 public void visitImport(JCImport tree) {
5988 sym.kind != VAR ||
5989 sym.getConstValue() == null)
5990 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5991 }
5992 }
5993
5994 // Check for proper placement of super()/this() calls.
5995 chk.checkSuperInitCalls(tree);
5996
5997 // Check for cycles among non-initial constructors.
5998 chk.checkCyclicConstructors(tree);
5999
6000 // Check for cycles among annotation elements.
6001 chk.checkNonCyclicElements(tree);
6002
6003 // Check for proper use of serialVersionUID and other
6004 // serialization-related fields and methods
6005 if (env.info.lint.isEnabled(LintCategory.SERIAL)
6006 && rs.isSerializable(c.type)
6007 && !c.isAnonymous()) {
6008 chk.checkSerialStructure(env, tree, c);
6009 }
6010 // Correctly organize the positions of the type annotations
6011 typeAnnotations.organizeTypeAnnotationsBodies(tree);
6012
6013 // Check type annotations applicability rules
6014 validateTypeAnnotations(tree, false);
6015 }
6016 // where
6017 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
6018 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
6019 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
6020 if (types.isSameType(al.head.annotationType.type, t))
6021 return al.head.pos();
6022 }
6023
6024 return null;
6025 }
6026
6027 private Type capture(Type type) {
6028 return types.capture(type);
|