20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.parser;
27
28 import java.util.*;
29 import java.util.function.Function;
30 import java.util.function.Predicate;
31 import java.util.stream.Collectors;
32
33 import javax.lang.model.SourceVersion;
34
35 import com.sun.source.tree.CaseTree;
36 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
37 import com.sun.source.tree.ModuleTree.ModuleKind;
38
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Source.Feature;
41 import com.sun.tools.javac.file.PathFileObject;
42 import com.sun.tools.javac.parser.Tokens.*;
43 import com.sun.tools.javac.resources.CompilerProperties.Errors;
44 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
45 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
46 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
47 import com.sun.tools.javac.tree.*;
48 import com.sun.tools.javac.tree.JCTree.*;
49 import com.sun.tools.javac.util.*;
50 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
51 import com.sun.tools.javac.util.JCDiagnostic.Error;
52 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
53 import com.sun.tools.javac.util.List;
54
55 import static com.sun.tools.javac.parser.Tokens.TokenKind.*;
56 import static com.sun.tools.javac.parser.Tokens.TokenKind.ASSERT;
57 import static com.sun.tools.javac.parser.Tokens.TokenKind.CASE;
58 import static com.sun.tools.javac.parser.Tokens.TokenKind.CATCH;
59 import static com.sun.tools.javac.parser.Tokens.TokenKind.EQ;
60 import static com.sun.tools.javac.parser.Tokens.TokenKind.GT;
61 import static com.sun.tools.javac.parser.Tokens.TokenKind.IMPORT;
62 import static com.sun.tools.javac.parser.Tokens.TokenKind.LT;
63 import com.sun.tools.javac.parser.VirtualParser.VirtualScanner;
64 import static com.sun.tools.javac.tree.JCTree.Tag.*;
65 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.ImplicitAndExplicitNotAllowed;
66 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndExplicitNotAllowed;
67 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndImplicitNotAllowed;
68 import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;
69
70 /**
71 * The parser maps a token sequence into an abstract syntax tree.
72 * The parser is a hand-written recursive-descent parser that
73 * implements the grammar described in the Java Language Specification.
74 * For efficiency reasons, an operator precedence scheme is used
75 * for parsing binary operation expressions.
76 *
77 * <p><b>This is NOT part of any supported API.
78 * If you write code that depends on this, you do so at your own risk.
79 * This code and its internal interfaces are subject to change or
80 * deletion without notice.</b>
81 */
82 public class JavacParser implements Parser {
177 Lexer S,
178 boolean keepDocComments,
179 boolean keepLineMap,
180 boolean parseModuleInfo) {
181 this.S = S;
182 nextToken(); // prime the pump
183 this.F = fac.F;
184 this.log = fac.log;
185 this.names = fac.names;
186 this.source = fac.source;
187 this.preview = fac.preview;
188 this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
189 this.keepDocComments = keepDocComments;
190 this.parseModuleInfo = parseModuleInfo;
191 this.docComments = newDocCommentTable(keepDocComments, fac);
192 this.keepLineMap = keepLineMap;
193 this.errorTree = F.Erroneous();
194 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
195 this.allowRecords = Feature.RECORDS.allowedInSource(source);
196 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
197 updateUnexpectedTopLevelDefinitionStartError(false);
198 }
199
200 /** Construct a parser from an existing parser, with minimal overhead.
201 */
202 @SuppressWarnings("this-escape")
203 protected JavacParser(JavacParser parser,
204 Lexer S) {
205 this.S = S;
206 this.token = parser.token;
207 this.F = parser.F;
208 this.log = parser.log;
209 this.names = parser.names;
210 this.source = parser.source;
211 this.preview = parser.preview;
212 this.allowStringFolding = parser.allowStringFolding;
213 this.keepDocComments = parser.keepDocComments;
214 this.parseModuleInfo = false;
215 this.docComments = parser.docComments;
216 this.errorTree = F.Erroneous();
217 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
218 this.allowRecords = Feature.RECORDS.allowedInSource(source);
219 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
220 updateUnexpectedTopLevelDefinitionStartError(false);
221 }
222
223 protected DocCommentTable newDocCommentTable(boolean keepDocComments, ParserFactory fac) {
224 return keepDocComments ? new LazyDocCommentTable(fac) : null;
225 }
226
227 /** Switch: should we fold strings?
228 */
229 boolean allowStringFolding;
230
231 /** Switch: should we keep docComments?
232 */
233 boolean keepDocComments;
234
235 /** Switch: should we keep line table?
236 */
237 boolean keepLineMap;
238
239 /** Switch: is "this" allowed as an identifier?
240 * This is needed to parse receiver types.
241 */
242 boolean allowThisIdent;
243
244 /** Switch: is yield statement allowed in this source level?
245 */
246 boolean allowYieldStatement;
247
248 /** Switch: are records allowed in this source level?
249 */
250 boolean allowRecords;
251
252 /** Switch: are sealed types allowed in this source level?
253 */
254 boolean allowSealedTypes;
255
256 /** The type of the method receiver, as specified by a first "this" parameter.
257 */
258 JCVariableDecl receiverParam;
259
260 /** When terms are parsed, the mode determines which is expected:
261 * mode = EXPR : an expression
262 * mode = TYPE : a type
263 * mode = NOLAMBDA : lambdas are not allowed
264 */
265 protected static final int EXPR = 1 << 0;
266 protected static final int TYPE = 1 << 1;
267 protected static final int NOLAMBDA = 1 << 2;
268
269 protected void setMode(int mode) {
270 this.mode = mode;
271 }
1645 token.kind == MONKEYS_AT) {
1646 //error recovery, case like:
1647 //int i = expr.<missing-ident>
1648 //@Deprecated
1649 if (typeArgs != null) illegal();
1650 return toP(t);
1651 }
1652 if (tyannos != null && tyannos.nonEmpty()) {
1653 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1654 }
1655 break;
1656 case ELLIPSIS:
1657 if (this.permitTypeAnnotationsPushBack) {
1658 this.typeAnnotationsPushedBack = annos;
1659 } else if (annos.nonEmpty()) {
1660 // Don't return here -- error recovery attempt
1661 illegal(annos.head.pos);
1662 }
1663 break loop;
1664 case LT:
1665 if (!isMode(TYPE) && isUnboundMemberRef()) {
1666 //this is an unbound method reference whose qualifier
1667 //is a generic type i.e. A<S>::m
1668 int pos1 = token.pos;
1669 accept(LT);
1670 ListBuffer<JCExpression> args = new ListBuffer<>();
1671 args.append(typeArgument());
1672 while (token.kind == COMMA) {
1673 nextToken();
1674 args.append(typeArgument());
1675 }
1676 accept(GT);
1677 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1678 while (token.kind == DOT) {
1679 nextToken();
1680 selectTypeMode();
1681 t = toP(F.at(token.pos).Select(t, ident()));
1682 t = typeApplyOpt(t);
1683 }
1684 t = bracketsOpt(t);
1685 if (token.kind != COLCOL) {
1686 //method reference expected here
1891 return illegal(annos.head.pos);
1892 }
1893 break;
1894 }
1895 }
1896 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1897 selectExprMode();
1898 t = to(F.at(token.pos).Unary(
1899 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1900 nextToken();
1901 }
1902 return toP(t);
1903 }
1904
1905 /**
1906 * If we see an identifier followed by a '<' it could be an unbound
1907 * method reference or a binary expression. To disambiguate, look for a
1908 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1909 */
1910 @SuppressWarnings("fallthrough")
1911 boolean isUnboundMemberRef() {
1912 int pos = 0, depth = 0;
1913 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1914 switch (t.kind) {
1915 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1916 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1917 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1918 case DOUBLE: case BOOLEAN: case CHAR:
1919 case MONKEYS_AT:
1920 break;
1921
1922 case LPAREN:
1923 // skip annotation values
1924 int nesting = 0;
1925 for (; ; pos++) {
1926 TokenKind tk2 = S.token(pos).kind;
1927 switch (tk2) {
1928 case EOF:
1929 return false;
1930 case LPAREN:
1931 nesting++;
2986 accept(SEMI);
2987 return List.of(toP(F.at(pos).Yield(t)));
2988 }
2989
2990 //else intentional fall-through
2991 } else {
2992 if (isNonSealedClassStart(true)) {
2993 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
2994 nextToken();
2995 nextToken();
2996 nextToken();
2997 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
2998 } else if (isSealedClassStart(true)) {
2999 checkSourceLevel(Feature.SEALED_CLASSES);
3000 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3001 nextToken();
3002 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3003 }
3004 }
3005 }
3006 dc = token.docComment();
3007 if (isRecordStart() && allowRecords) {
3008 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
3009 } else {
3010 Token prevToken = token;
3011 JCExpression t = term(EXPR | TYPE);
3012 if (token.kind == COLON && t.hasTag(IDENT)) {
3013 nextToken();
3014 JCStatement stat = parseStatementAsBlock();
3015 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
3016 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3017 pos = token.pos;
3018 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
3019 F.at(pos);
3020 return localVariableDeclarations(mods, t, dc);
3021 } else {
3022 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
3023 t = checkExprStat(t);
3024 accept(SEMI);
3025 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
3591 case ABSTRACT : flag = Flags.ABSTRACT; break;
3592 case NATIVE : flag = Flags.NATIVE; break;
3593 case VOLATILE : flag = Flags.VOLATILE; break;
3594 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3595 case STRICTFP : flag = Flags.STRICTFP; break;
3596 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3597 case DEFAULT : flag = Flags.DEFAULT; break;
3598 case ERROR : flag = 0; nextToken(); break;
3599 case IDENTIFIER : {
3600 if (isNonSealedClassStart(false)) {
3601 flag = Flags.NON_SEALED;
3602 nextToken();
3603 nextToken();
3604 break;
3605 }
3606 if (isSealedClassStart(false)) {
3607 checkSourceLevel(Feature.SEALED_CLASSES);
3608 flag = Flags.SEALED;
3609 break;
3610 }
3611 break loop;
3612 }
3613 default: break loop;
3614 }
3615 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3616 lastPos = token.pos;
3617 nextToken();
3618 if (flag == Flags.ANNOTATION) {
3619 if (token.kind != INTERFACE) {
3620 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3621 // if first modifier is an annotation, set pos to annotation's.
3622 if (flags == 0 && annotations.isEmpty())
3623 pos = ann.pos;
3624 annotations.append(ann);
3625 flag = 0;
3626 }
3627 }
3628 flags |= flag;
3629 }
3630 switch (token.kind) {
3858 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3859 return Source.JDK10;
3860 } else if (shouldWarn) {
3861 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK10));
3862 }
3863 }
3864 if (name == names.yield) {
3865 if (allowYieldStatement) {
3866 return Source.JDK14;
3867 } else if (shouldWarn) {
3868 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK14));
3869 }
3870 }
3871 if (name == names.record) {
3872 if (allowRecords) {
3873 return Source.JDK14;
3874 } else if (shouldWarn) {
3875 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK14));
3876 }
3877 }
3878 if (name == names.sealed) {
3879 if (allowSealedTypes) {
3880 return Source.JDK15;
3881 } else if (shouldWarn) {
3882 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3883 }
3884 }
3885 if (name == names.permits) {
3886 if (allowSealedTypes) {
3887 return Source.JDK15;
3888 } else if (shouldWarn) {
3889 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3890 }
3891 }
3892 return null;
3893 }
3894
3895 /** VariableDeclaratorId = Ident BracketsOpt
3896 */
3897 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
4978 Token next = S.token(3);
4979 return allowedAfterSealedOrNonSealed(next, local, true);
4980 }
4981 return false;
4982 }
4983
4984 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
4985 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
4986 Token tokenSub = S.token(lookAheadOffset + 1);
4987 Token tokenSealed = S.token(lookAheadOffset + 2);
4988 if (someToken.endPos == tokenSub.pos &&
4989 tokenSub.endPos == tokenSealed.pos &&
4990 tokenSealed.name() == names.sealed) {
4991 checkSourceLevel(Feature.SEALED_CLASSES);
4992 return true;
4993 }
4994 }
4995 return false;
4996 }
4997
4998 protected boolean isSealedClassStart(boolean local) {
4999 if (token.name() == names.sealed) {
5000 Token next = S.token(1);
5001 if (allowedAfterSealedOrNonSealed(next, local, false)) {
5002 checkSourceLevel(Feature.SEALED_CLASSES);
5003 return true;
5004 }
5005 }
5006 return false;
5007 }
5008
5009 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
5010 return local ?
5011 switch (next.kind) {
5012 case MONKEYS_AT -> {
5013 Token afterNext = S.token(2);
5014 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5015 }
5016 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5017 default -> false;
5018 } :
5019 switch (next.kind) {
5020 case MONKEYS_AT -> {
5021 Token afterNext = S.token(2);
5022 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5023 }
5024 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5025 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) || next.name() == names.sealed;
5026 default -> false;
5027 };
5028 }
5029
5030 /** MethodDeclaratorRest =
5031 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
5032 * VoidMethodDeclaratorRest =
5033 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
5034 * ConstructorDeclaratorRest =
5035 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
5036 */
5037 protected JCTree methodDeclaratorRest(int pos,
5038 JCModifiers mods,
5039 JCExpression type,
5040 Name name,
5041 List<JCTypeParameter> typarams,
5042 boolean isInterface, boolean isVoid,
5043 boolean isRecord,
5044 Comment dc) {
5045 if (isInterface) {
|
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.parser;
27
28 import java.util.*;
29 import java.util.function.Function;
30 import java.util.function.Predicate;
31 import java.util.stream.Collectors;
32
33 import javax.lang.model.SourceVersion;
34
35 import com.sun.source.tree.CaseTree;
36 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
37 import com.sun.source.tree.ModuleTree.ModuleKind;
38
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.FlagsEnum;
41 import com.sun.tools.javac.code.Source.Feature;
42 import com.sun.tools.javac.file.PathFileObject;
43 import com.sun.tools.javac.parser.Tokens.*;
44 import com.sun.tools.javac.parser.Tokens.Comment.CommentStyle;
45 import com.sun.tools.javac.resources.CompilerProperties.Errors;
46 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
47 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
48 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
49 import com.sun.tools.javac.tree.*;
50 import com.sun.tools.javac.tree.JCTree.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
53 import com.sun.tools.javac.util.JCDiagnostic.Error;
54 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
55 import com.sun.tools.javac.util.List;
56
57 import static com.sun.tools.javac.code.Flags.asFlagSet;
58 import static com.sun.tools.javac.parser.Tokens.TokenKind.*;
59 import static com.sun.tools.javac.parser.Tokens.TokenKind.ASSERT;
60 import static com.sun.tools.javac.parser.Tokens.TokenKind.CASE;
61 import static com.sun.tools.javac.parser.Tokens.TokenKind.CATCH;
62 import static com.sun.tools.javac.parser.Tokens.TokenKind.EQ;
63 import static com.sun.tools.javac.parser.Tokens.TokenKind.GT;
64 import static com.sun.tools.javac.parser.Tokens.TokenKind.IMPORT;
65 import static com.sun.tools.javac.parser.Tokens.TokenKind.LT;
66 import static com.sun.tools.javac.parser.Tokens.TokenKind.SYNCHRONIZED;
67 import com.sun.tools.javac.parser.VirtualParser.VirtualScanner;
68 import static com.sun.tools.javac.tree.JCTree.Tag.*;
69 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.ImplicitAndExplicitNotAllowed;
70 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndExplicitNotAllowed;
71 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndImplicitNotAllowed;
72 import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;
73
74 /**
75 * The parser maps a token sequence into an abstract syntax tree.
76 * The parser is a hand-written recursive-descent parser that
77 * implements the grammar described in the Java Language Specification.
78 * For efficiency reasons, an operator precedence scheme is used
79 * for parsing binary operation expressions.
80 *
81 * <p><b>This is NOT part of any supported API.
82 * If you write code that depends on this, you do so at your own risk.
83 * This code and its internal interfaces are subject to change or
84 * deletion without notice.</b>
85 */
86 public class JavacParser implements Parser {
181 Lexer S,
182 boolean keepDocComments,
183 boolean keepLineMap,
184 boolean parseModuleInfo) {
185 this.S = S;
186 nextToken(); // prime the pump
187 this.F = fac.F;
188 this.log = fac.log;
189 this.names = fac.names;
190 this.source = fac.source;
191 this.preview = fac.preview;
192 this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
193 this.keepDocComments = keepDocComments;
194 this.parseModuleInfo = parseModuleInfo;
195 this.docComments = newDocCommentTable(keepDocComments, fac);
196 this.keepLineMap = keepLineMap;
197 this.errorTree = F.Erroneous();
198 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
199 this.allowRecords = Feature.RECORDS.allowedInSource(source);
200 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
201 this.allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
202 Feature.VALUE_CLASSES.allowedInSource(source);
203 updateUnexpectedTopLevelDefinitionStartError(false);
204 }
205
206 /** Construct a parser from an existing parser, with minimal overhead.
207 */
208 @SuppressWarnings("this-escape")
209 protected JavacParser(JavacParser parser,
210 Lexer S) {
211 this.S = S;
212 this.token = parser.token;
213 this.F = parser.F;
214 this.log = parser.log;
215 this.names = parser.names;
216 this.source = parser.source;
217 this.preview = parser.preview;
218 this.allowStringFolding = parser.allowStringFolding;
219 this.keepDocComments = parser.keepDocComments;
220 this.parseModuleInfo = false;
221 this.docComments = parser.docComments;
222 this.errorTree = F.Erroneous();
223 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
224 this.allowRecords = Feature.RECORDS.allowedInSource(source);
225 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
226 this.allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
227 Feature.VALUE_CLASSES.allowedInSource(source);
228 updateUnexpectedTopLevelDefinitionStartError(false);
229 }
230
231 protected DocCommentTable newDocCommentTable(boolean keepDocComments, ParserFactory fac) {
232 return keepDocComments ? new LazyDocCommentTable(fac) : null;
233 }
234
235 /** Switch: should we fold strings?
236 */
237 boolean allowStringFolding;
238
239 /** Switch: should we keep docComments?
240 */
241 boolean keepDocComments;
242
243 /** Switch: should we keep line table?
244 */
245 boolean keepLineMap;
246
247 /** Switch: is "this" allowed as an identifier?
248 * This is needed to parse receiver types.
249 */
250 boolean allowThisIdent;
251
252 /** Switch: is yield statement allowed in this source level?
253 */
254 boolean allowYieldStatement;
255
256 /** Switch: are records allowed in this source level?
257 */
258 boolean allowRecords;
259
260 /** Switch: are value classes allowed in this source level?
261 */
262 boolean allowValueClasses;
263
264 /** Switch: are sealed types allowed in this source level?
265 */
266 boolean allowSealedTypes;
267
268 /** The type of the method receiver, as specified by a first "this" parameter.
269 */
270 JCVariableDecl receiverParam;
271
272 /** When terms are parsed, the mode determines which is expected:
273 * mode = EXPR : an expression
274 * mode = TYPE : a type
275 * mode = NOLAMBDA : lambdas are not allowed
276 */
277 protected static final int EXPR = 1 << 0;
278 protected static final int TYPE = 1 << 1;
279 protected static final int NOLAMBDA = 1 << 2;
280
281 protected void setMode(int mode) {
282 this.mode = mode;
283 }
1657 token.kind == MONKEYS_AT) {
1658 //error recovery, case like:
1659 //int i = expr.<missing-ident>
1660 //@Deprecated
1661 if (typeArgs != null) illegal();
1662 return toP(t);
1663 }
1664 if (tyannos != null && tyannos.nonEmpty()) {
1665 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1666 }
1667 break;
1668 case ELLIPSIS:
1669 if (this.permitTypeAnnotationsPushBack) {
1670 this.typeAnnotationsPushedBack = annos;
1671 } else if (annos.nonEmpty()) {
1672 // Don't return here -- error recovery attempt
1673 illegal(annos.head.pos);
1674 }
1675 break loop;
1676 case LT:
1677 if (!isMode(TYPE) && isParameterizedTypePrefix()) {
1678 //this is either an unbound method reference whose qualifier
1679 //is a generic type i.e. A<S>::m
1680 int pos1 = token.pos;
1681 accept(LT);
1682 ListBuffer<JCExpression> args = new ListBuffer<>();
1683 args.append(typeArgument());
1684 while (token.kind == COMMA) {
1685 nextToken();
1686 args.append(typeArgument());
1687 }
1688 accept(GT);
1689 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1690 while (token.kind == DOT) {
1691 nextToken();
1692 selectTypeMode();
1693 t = toP(F.at(token.pos).Select(t, ident()));
1694 t = typeApplyOpt(t);
1695 }
1696 t = bracketsOpt(t);
1697 if (token.kind != COLCOL) {
1698 //method reference expected here
1903 return illegal(annos.head.pos);
1904 }
1905 break;
1906 }
1907 }
1908 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1909 selectExprMode();
1910 t = to(F.at(token.pos).Unary(
1911 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1912 nextToken();
1913 }
1914 return toP(t);
1915 }
1916
1917 /**
1918 * If we see an identifier followed by a '<' it could be an unbound
1919 * method reference or a binary expression. To disambiguate, look for a
1920 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1921 */
1922 @SuppressWarnings("fallthrough")
1923 boolean isParameterizedTypePrefix() {
1924 int pos = 0, depth = 0;
1925 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1926 switch (t.kind) {
1927 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1928 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1929 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1930 case DOUBLE: case BOOLEAN: case CHAR:
1931 case MONKEYS_AT:
1932 break;
1933
1934 case LPAREN:
1935 // skip annotation values
1936 int nesting = 0;
1937 for (; ; pos++) {
1938 TokenKind tk2 = S.token(pos).kind;
1939 switch (tk2) {
1940 case EOF:
1941 return false;
1942 case LPAREN:
1943 nesting++;
2998 accept(SEMI);
2999 return List.of(toP(F.at(pos).Yield(t)));
3000 }
3001
3002 //else intentional fall-through
3003 } else {
3004 if (isNonSealedClassStart(true)) {
3005 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3006 nextToken();
3007 nextToken();
3008 nextToken();
3009 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3010 } else if (isSealedClassStart(true)) {
3011 checkSourceLevel(Feature.SEALED_CLASSES);
3012 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3013 nextToken();
3014 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3015 }
3016 }
3017 }
3018 if ((isValueModifier()) && allowValueClasses) {
3019 checkSourceLevel(Feature.VALUE_CLASSES);
3020 dc = token.docComment();
3021 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
3022 }
3023 dc = token.docComment();
3024 if (isRecordStart() && allowRecords) {
3025 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
3026 } else {
3027 Token prevToken = token;
3028 JCExpression t = term(EXPR | TYPE);
3029 if (token.kind == COLON && t.hasTag(IDENT)) {
3030 nextToken();
3031 JCStatement stat = parseStatementAsBlock();
3032 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
3033 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3034 pos = token.pos;
3035 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
3036 F.at(pos);
3037 return localVariableDeclarations(mods, t, dc);
3038 } else {
3039 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
3040 t = checkExprStat(t);
3041 accept(SEMI);
3042 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
3608 case ABSTRACT : flag = Flags.ABSTRACT; break;
3609 case NATIVE : flag = Flags.NATIVE; break;
3610 case VOLATILE : flag = Flags.VOLATILE; break;
3611 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3612 case STRICTFP : flag = Flags.STRICTFP; break;
3613 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3614 case DEFAULT : flag = Flags.DEFAULT; break;
3615 case ERROR : flag = 0; nextToken(); break;
3616 case IDENTIFIER : {
3617 if (isNonSealedClassStart(false)) {
3618 flag = Flags.NON_SEALED;
3619 nextToken();
3620 nextToken();
3621 break;
3622 }
3623 if (isSealedClassStart(false)) {
3624 checkSourceLevel(Feature.SEALED_CLASSES);
3625 flag = Flags.SEALED;
3626 break;
3627 }
3628 if (isValueModifier()) {
3629 checkSourceLevel(Feature.VALUE_CLASSES);
3630 flag = Flags.VALUE_CLASS;
3631 break;
3632 }
3633 break loop;
3634 }
3635 default: break loop;
3636 }
3637 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3638 lastPos = token.pos;
3639 nextToken();
3640 if (flag == Flags.ANNOTATION) {
3641 if (token.kind != INTERFACE) {
3642 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3643 // if first modifier is an annotation, set pos to annotation's.
3644 if (flags == 0 && annotations.isEmpty())
3645 pos = ann.pos;
3646 annotations.append(ann);
3647 flag = 0;
3648 }
3649 }
3650 flags |= flag;
3651 }
3652 switch (token.kind) {
3880 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3881 return Source.JDK10;
3882 } else if (shouldWarn) {
3883 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK10));
3884 }
3885 }
3886 if (name == names.yield) {
3887 if (allowYieldStatement) {
3888 return Source.JDK14;
3889 } else if (shouldWarn) {
3890 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK14));
3891 }
3892 }
3893 if (name == names.record) {
3894 if (allowRecords) {
3895 return Source.JDK14;
3896 } else if (shouldWarn) {
3897 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK14));
3898 }
3899 }
3900 if (name == names.value) {
3901 if (allowValueClasses) {
3902 return Source.JDK23;
3903 } else if (shouldWarn) {
3904 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK23));
3905 }
3906 }
3907 if (name == names.sealed) {
3908 if (allowSealedTypes) {
3909 return Source.JDK15;
3910 } else if (shouldWarn) {
3911 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3912 }
3913 }
3914 if (name == names.permits) {
3915 if (allowSealedTypes) {
3916 return Source.JDK15;
3917 } else if (shouldWarn) {
3918 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3919 }
3920 }
3921 return null;
3922 }
3923
3924 /** VariableDeclaratorId = Ident BracketsOpt
3925 */
3926 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
5007 Token next = S.token(3);
5008 return allowedAfterSealedOrNonSealed(next, local, true);
5009 }
5010 return false;
5011 }
5012
5013 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
5014 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
5015 Token tokenSub = S.token(lookAheadOffset + 1);
5016 Token tokenSealed = S.token(lookAheadOffset + 2);
5017 if (someToken.endPos == tokenSub.pos &&
5018 tokenSub.endPos == tokenSealed.pos &&
5019 tokenSealed.name() == names.sealed) {
5020 checkSourceLevel(Feature.SEALED_CLASSES);
5021 return true;
5022 }
5023 }
5024 return false;
5025 }
5026
5027 protected boolean isValueModifier() {
5028 if (token.kind == IDENTIFIER && token.name() == names.value) {
5029 boolean isValueModifier = false;
5030 Token next = S.token(1);
5031 switch (next.kind) {
5032 case PRIVATE: case PROTECTED: case PUBLIC: case STATIC: case TRANSIENT:
5033 case FINAL: case ABSTRACT: case NATIVE: case VOLATILE: case SYNCHRONIZED:
5034 case STRICTFP: case MONKEYS_AT: case DEFAULT: case BYTE: case SHORT:
5035 case CHAR: case INT: case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
5036 case CLASS: case INTERFACE: case ENUM:
5037 isValueModifier = true;
5038 break;
5039 case IDENTIFIER: // value record R || value value || new value Comparable() {} ??
5040 if (next.name() == names.record || next.name() == names.value
5041 || (mode & EXPR) != 0)
5042 isValueModifier = true;
5043 break;
5044 }
5045 if (isValueModifier) {
5046 checkSourceLevel(Feature.VALUE_CLASSES);
5047 return true;
5048 }
5049 }
5050 return false;
5051 }
5052
5053 protected boolean isSealedClassStart(boolean local) {
5054 if (token.name() == names.sealed) {
5055 Token next = S.token(1);
5056 if (allowedAfterSealedOrNonSealed(next, local, false)) {
5057 checkSourceLevel(Feature.SEALED_CLASSES);
5058 return true;
5059 }
5060 }
5061 return false;
5062 }
5063
5064 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
5065 return local ?
5066 switch (next.kind) {
5067 case MONKEYS_AT -> {
5068 Token afterNext = S.token(2);
5069 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5070 }
5071 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5072 default -> false;
5073 } :
5074 switch (next.kind) {
5075 case MONKEYS_AT -> {
5076 Token afterNext = S.token(2);
5077 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5078 }
5079 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5080 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) ||
5081 next.name() == names.sealed ||
5082 allowValueClasses && next.name() == names.value;
5083 default -> false;
5084 };
5085 }
5086
5087 /** MethodDeclaratorRest =
5088 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
5089 * VoidMethodDeclaratorRest =
5090 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
5091 * ConstructorDeclaratorRest =
5092 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
5093 */
5094 protected JCTree methodDeclaratorRest(int pos,
5095 JCModifiers mods,
5096 JCExpression type,
5097 Name name,
5098 List<JCTypeParameter> typarams,
5099 boolean isInterface, boolean isVoid,
5100 boolean isRecord,
5101 Comment dc) {
5102 if (isInterface) {
|