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 {
181 boolean keepLineMap,
182 boolean keepEndPositions,
183 boolean parseModuleInfo) {
184 this.S = S;
185 nextToken(); // prime the pump
186 this.F = fac.F;
187 this.log = fac.log;
188 this.names = fac.names;
189 this.source = fac.source;
190 this.preview = fac.preview;
191 this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
192 this.keepDocComments = keepDocComments;
193 this.parseModuleInfo = parseModuleInfo;
194 this.docComments = newDocCommentTable(keepDocComments, fac);
195 this.keepLineMap = keepLineMap;
196 this.errorTree = F.Erroneous();
197 this.endPosTable = newEndPosTable(keepEndPositions);
198 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
199 this.allowRecords = Feature.RECORDS.allowedInSource(source);
200 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
201 updateUnexpectedTopLevelDefinitionStartError(false);
202 }
203
204 /** Construct a parser from an existing parser, with minimal overhead.
205 */
206 @SuppressWarnings("this-escape")
207 protected JavacParser(JavacParser parser,
208 Lexer S) {
209 this.S = S;
210 this.token = parser.token;
211 this.F = parser.F;
212 this.log = parser.log;
213 this.names = parser.names;
214 this.source = parser.source;
215 this.preview = parser.preview;
216 this.allowStringFolding = parser.allowStringFolding;
217 this.keepDocComments = parser.keepDocComments;
218 this.parseModuleInfo = false;
219 this.docComments = parser.docComments;
220 this.errorTree = F.Erroneous();
221 this.endPosTable = newEndPosTable(false);
222 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
223 this.allowRecords = Feature.RECORDS.allowedInSource(source);
224 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
225 updateUnexpectedTopLevelDefinitionStartError(false);
226 }
227
228 protected AbstractEndPosTable newEndPosTable(boolean keepEndPositions) {
229 return keepEndPositions
230 ? new SimpleEndPosTable()
231 : new MinimalEndPosTable();
232 }
233
234 protected DocCommentTable newDocCommentTable(boolean keepDocComments, ParserFactory fac) {
235 return keepDocComments ? new LazyDocCommentTable(fac) : null;
236 }
237
238 /** Switch: should we fold strings?
239 */
240 boolean allowStringFolding;
241
242 /** Switch: should we keep docComments?
243 */
244 boolean keepDocComments;
245
246 /** Switch: should we keep line table?
247 */
248 boolean keepLineMap;
249
250 /** Switch: is "this" allowed as an identifier?
251 * This is needed to parse receiver types.
252 */
253 boolean allowThisIdent;
254
255 /** Switch: is yield statement allowed in this source level?
256 */
257 boolean allowYieldStatement;
258
259 /** Switch: are records allowed in this source level?
260 */
261 boolean allowRecords;
262
263 /** Switch: are sealed types allowed in this source level?
264 */
265 boolean allowSealedTypes;
266
267 /** The type of the method receiver, as specified by a first "this" parameter.
268 */
269 JCVariableDecl receiverParam;
270
271 /** When terms are parsed, the mode determines which is expected:
272 * mode = EXPR : an expression
273 * mode = TYPE : a type
274 * mode = NOPARAMS : no parameters allowed for type
275 * mode = TYPEARG : type argument
276 * mode |= NOLAMBDA : lambdas are not allowed
277 */
278 protected static final int EXPR = 1 << 0;
279 protected static final int TYPE = 1 << 1;
280 protected static final int NOPARAMS = 1 << 2;
281 protected static final int TYPEARG = 1 << 3;
282 protected static final int DIAMOND = 1 << 4;
1660 token.kind == MONKEYS_AT) {
1661 //error recovery, case like:
1662 //int i = expr.<missing-ident>
1663 //@Deprecated
1664 if (typeArgs != null) illegal();
1665 return toP(t);
1666 }
1667 if (tyannos != null && tyannos.nonEmpty()) {
1668 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1669 }
1670 break;
1671 case ELLIPSIS:
1672 if (this.permitTypeAnnotationsPushBack) {
1673 this.typeAnnotationsPushedBack = annos;
1674 } else if (annos.nonEmpty()) {
1675 // Don't return here -- error recovery attempt
1676 illegal(annos.head.pos);
1677 }
1678 break loop;
1679 case LT:
1680 if (!isMode(TYPE) && isUnboundMemberRef()) {
1681 //this is an unbound method reference whose qualifier
1682 //is a generic type i.e. A<S>::m
1683 int pos1 = token.pos;
1684 accept(LT);
1685 ListBuffer<JCExpression> args = new ListBuffer<>();
1686 args.append(typeArgument());
1687 while (token.kind == COMMA) {
1688 nextToken();
1689 args.append(typeArgument());
1690 }
1691 accept(GT);
1692 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1693 while (token.kind == DOT) {
1694 nextToken();
1695 selectTypeMode();
1696 t = toP(F.at(token.pos).Select(t, ident()));
1697 t = typeArgumentsOpt(t);
1698 }
1699 t = bracketsOpt(t);
1700 if (token.kind != COLCOL) {
1701 //method reference expected here
1906 return illegal(annos.head.pos);
1907 }
1908 break;
1909 }
1910 }
1911 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1912 selectExprMode();
1913 t = to(F.at(token.pos).Unary(
1914 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1915 nextToken();
1916 }
1917 return toP(t);
1918 }
1919
1920 /**
1921 * If we see an identifier followed by a '<' it could be an unbound
1922 * method reference or a binary expression. To disambiguate, look for a
1923 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1924 */
1925 @SuppressWarnings("fallthrough")
1926 boolean isUnboundMemberRef() {
1927 int pos = 0, depth = 0;
1928 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1929 switch (t.kind) {
1930 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1931 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1932 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1933 case DOUBLE: case BOOLEAN: case CHAR:
1934 case MONKEYS_AT:
1935 break;
1936
1937 case LPAREN:
1938 // skip annotation values
1939 int nesting = 0;
1940 for (; ; pos++) {
1941 TokenKind tk2 = S.token(pos).kind;
1942 switch (tk2) {
1943 case EOF:
1944 return false;
1945 case LPAREN:
1946 nesting++;
3002 accept(SEMI);
3003 return List.of(toP(F.at(pos).Yield(t)));
3004 }
3005
3006 //else intentional fall-through
3007 } else {
3008 if (isNonSealedClassStart(true)) {
3009 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3010 nextToken();
3011 nextToken();
3012 nextToken();
3013 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3014 } else if (isSealedClassStart(true)) {
3015 checkSourceLevel(Feature.SEALED_CLASSES);
3016 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3017 nextToken();
3018 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3019 }
3020 }
3021 }
3022 dc = token.docComment();
3023 if (isRecordStart() && allowRecords) {
3024 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
3025 } else {
3026 Token prevToken = token;
3027 JCExpression t = term(EXPR | TYPE);
3028 if (token.kind == COLON && t.hasTag(IDENT)) {
3029 nextToken();
3030 JCStatement stat = parseStatementAsBlock();
3031 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
3032 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3033 pos = token.pos;
3034 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
3035 F.at(pos);
3036 return localVariableDeclarations(mods, t, dc);
3037 } else {
3038 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
3039 t = checkExprStat(t);
3040 accept(SEMI);
3041 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
3607 case ABSTRACT : flag = Flags.ABSTRACT; break;
3608 case NATIVE : flag = Flags.NATIVE; break;
3609 case VOLATILE : flag = Flags.VOLATILE; break;
3610 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3611 case STRICTFP : flag = Flags.STRICTFP; break;
3612 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3613 case DEFAULT : flag = Flags.DEFAULT; break;
3614 case ERROR : flag = 0; nextToken(); break;
3615 case IDENTIFIER : {
3616 if (isNonSealedClassStart(false)) {
3617 flag = Flags.NON_SEALED;
3618 nextToken();
3619 nextToken();
3620 break;
3621 }
3622 if (isSealedClassStart(false)) {
3623 checkSourceLevel(Feature.SEALED_CLASSES);
3624 flag = Flags.SEALED;
3625 break;
3626 }
3627 break loop;
3628 }
3629 default: break loop;
3630 }
3631 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3632 lastPos = token.pos;
3633 nextToken();
3634 if (flag == Flags.ANNOTATION) {
3635 if (token.kind != INTERFACE) {
3636 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3637 // if first modifier is an annotation, set pos to annotation's.
3638 if (flags == 0 && annotations.isEmpty())
3639 pos = ann.pos;
3640 annotations.append(ann);
3641 flag = 0;
3642 }
3643 }
3644 flags |= flag;
3645 }
3646 switch (token.kind) {
3870 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3871 return Source.JDK10;
3872 } else if (shouldWarn) {
3873 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK10));
3874 }
3875 }
3876 if (name == names.yield) {
3877 if (allowYieldStatement) {
3878 return Source.JDK14;
3879 } else if (shouldWarn) {
3880 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK14));
3881 }
3882 }
3883 if (name == names.record) {
3884 if (allowRecords) {
3885 return Source.JDK14;
3886 } else if (shouldWarn) {
3887 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK14));
3888 }
3889 }
3890 if (name == names.sealed) {
3891 if (allowSealedTypes) {
3892 return Source.JDK15;
3893 } else if (shouldWarn) {
3894 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3895 }
3896 }
3897 if (name == names.permits) {
3898 if (allowSealedTypes) {
3899 return Source.JDK15;
3900 } else if (shouldWarn) {
3901 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3902 }
3903 }
3904 return null;
3905 }
3906
3907 /** VariableDeclaratorId = Ident BracketsOpt
3908 */
3909 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
4990 Token next = S.token(3);
4991 return allowedAfterSealedOrNonSealed(next, local, true);
4992 }
4993 return false;
4994 }
4995
4996 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
4997 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
4998 Token tokenSub = S.token(lookAheadOffset + 1);
4999 Token tokenSealed = S.token(lookAheadOffset + 2);
5000 if (someToken.endPos == tokenSub.pos &&
5001 tokenSub.endPos == tokenSealed.pos &&
5002 tokenSealed.name() == names.sealed) {
5003 checkSourceLevel(Feature.SEALED_CLASSES);
5004 return true;
5005 }
5006 }
5007 return false;
5008 }
5009
5010 protected boolean isSealedClassStart(boolean local) {
5011 if (token.name() == names.sealed) {
5012 Token next = S.token(1);
5013 if (allowedAfterSealedOrNonSealed(next, local, false)) {
5014 checkSourceLevel(Feature.SEALED_CLASSES);
5015 return true;
5016 }
5017 }
5018 return false;
5019 }
5020
5021 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
5022 return local ?
5023 switch (next.kind) {
5024 case MONKEYS_AT -> {
5025 Token afterNext = S.token(2);
5026 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5027 }
5028 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5029 default -> false;
5030 } :
5031 switch (next.kind) {
5032 case MONKEYS_AT -> {
5033 Token afterNext = S.token(2);
5034 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5035 }
5036 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5037 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) || next.name() == names.sealed;
5038 default -> false;
5039 };
5040 }
5041
5042 /** MethodDeclaratorRest =
5043 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
5044 * VoidMethodDeclaratorRest =
5045 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
5046 * ConstructorDeclaratorRest =
5047 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
5048 */
5049 protected JCTree methodDeclaratorRest(int pos,
5050 JCModifiers mods,
5051 JCExpression type,
5052 Name name,
5053 List<JCTypeParameter> typarams,
5054 boolean isInterface, boolean isVoid,
5055 boolean isRecord,
5056 Comment dc) {
5057 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 {
185 boolean keepLineMap,
186 boolean keepEndPositions,
187 boolean parseModuleInfo) {
188 this.S = S;
189 nextToken(); // prime the pump
190 this.F = fac.F;
191 this.log = fac.log;
192 this.names = fac.names;
193 this.source = fac.source;
194 this.preview = fac.preview;
195 this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
196 this.keepDocComments = keepDocComments;
197 this.parseModuleInfo = parseModuleInfo;
198 this.docComments = newDocCommentTable(keepDocComments, fac);
199 this.keepLineMap = keepLineMap;
200 this.errorTree = F.Erroneous();
201 this.endPosTable = newEndPosTable(keepEndPositions);
202 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
203 this.allowRecords = Feature.RECORDS.allowedInSource(source);
204 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
205 this.allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
206 Feature.VALUE_CLASSES.allowedInSource(source);
207 updateUnexpectedTopLevelDefinitionStartError(false);
208 }
209
210 /** Construct a parser from an existing parser, with minimal overhead.
211 */
212 @SuppressWarnings("this-escape")
213 protected JavacParser(JavacParser parser,
214 Lexer S) {
215 this.S = S;
216 this.token = parser.token;
217 this.F = parser.F;
218 this.log = parser.log;
219 this.names = parser.names;
220 this.source = parser.source;
221 this.preview = parser.preview;
222 this.allowStringFolding = parser.allowStringFolding;
223 this.keepDocComments = parser.keepDocComments;
224 this.parseModuleInfo = false;
225 this.docComments = parser.docComments;
226 this.errorTree = F.Erroneous();
227 this.endPosTable = newEndPosTable(false);
228 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
229 this.allowRecords = Feature.RECORDS.allowedInSource(source);
230 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
231 this.allowValueClasses = (!preview.isPreview(Feature.VALUE_CLASSES) || preview.isEnabled()) &&
232 Feature.VALUE_CLASSES.allowedInSource(source);
233 updateUnexpectedTopLevelDefinitionStartError(false);
234 }
235
236 protected AbstractEndPosTable newEndPosTable(boolean keepEndPositions) {
237 return keepEndPositions
238 ? new SimpleEndPosTable()
239 : new MinimalEndPosTable();
240 }
241
242 protected DocCommentTable newDocCommentTable(boolean keepDocComments, ParserFactory fac) {
243 return keepDocComments ? new LazyDocCommentTable(fac) : null;
244 }
245
246 /** Switch: should we fold strings?
247 */
248 boolean allowStringFolding;
249
250 /** Switch: should we keep docComments?
251 */
252 boolean keepDocComments;
253
254 /** Switch: should we keep line table?
255 */
256 boolean keepLineMap;
257
258 /** Switch: is "this" allowed as an identifier?
259 * This is needed to parse receiver types.
260 */
261 boolean allowThisIdent;
262
263 /** Switch: is yield statement allowed in this source level?
264 */
265 boolean allowYieldStatement;
266
267 /** Switch: are records allowed in this source level?
268 */
269 boolean allowRecords;
270
271 /** Switch: are value classes allowed in this source level?
272 */
273 boolean allowValueClasses;
274
275 /** Switch: are sealed types allowed in this source level?
276 */
277 boolean allowSealedTypes;
278
279 /** The type of the method receiver, as specified by a first "this" parameter.
280 */
281 JCVariableDecl receiverParam;
282
283 /** When terms are parsed, the mode determines which is expected:
284 * mode = EXPR : an expression
285 * mode = TYPE : a type
286 * mode = NOPARAMS : no parameters allowed for type
287 * mode = TYPEARG : type argument
288 * mode |= NOLAMBDA : lambdas are not allowed
289 */
290 protected static final int EXPR = 1 << 0;
291 protected static final int TYPE = 1 << 1;
292 protected static final int NOPARAMS = 1 << 2;
293 protected static final int TYPEARG = 1 << 3;
294 protected static final int DIAMOND = 1 << 4;
1672 token.kind == MONKEYS_AT) {
1673 //error recovery, case like:
1674 //int i = expr.<missing-ident>
1675 //@Deprecated
1676 if (typeArgs != null) illegal();
1677 return toP(t);
1678 }
1679 if (tyannos != null && tyannos.nonEmpty()) {
1680 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1681 }
1682 break;
1683 case ELLIPSIS:
1684 if (this.permitTypeAnnotationsPushBack) {
1685 this.typeAnnotationsPushedBack = annos;
1686 } else if (annos.nonEmpty()) {
1687 // Don't return here -- error recovery attempt
1688 illegal(annos.head.pos);
1689 }
1690 break loop;
1691 case LT:
1692 if (!isMode(TYPE) && isParameterizedTypePrefix()) {
1693 //this is either an unbound method reference whose qualifier
1694 //is a generic type i.e. A<S>::m
1695 int pos1 = token.pos;
1696 accept(LT);
1697 ListBuffer<JCExpression> args = new ListBuffer<>();
1698 args.append(typeArgument());
1699 while (token.kind == COMMA) {
1700 nextToken();
1701 args.append(typeArgument());
1702 }
1703 accept(GT);
1704 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1705 while (token.kind == DOT) {
1706 nextToken();
1707 selectTypeMode();
1708 t = toP(F.at(token.pos).Select(t, ident()));
1709 t = typeArgumentsOpt(t);
1710 }
1711 t = bracketsOpt(t);
1712 if (token.kind != COLCOL) {
1713 //method reference expected here
1918 return illegal(annos.head.pos);
1919 }
1920 break;
1921 }
1922 }
1923 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1924 selectExprMode();
1925 t = to(F.at(token.pos).Unary(
1926 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1927 nextToken();
1928 }
1929 return toP(t);
1930 }
1931
1932 /**
1933 * If we see an identifier followed by a '<' it could be an unbound
1934 * method reference or a binary expression. To disambiguate, look for a
1935 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1936 */
1937 @SuppressWarnings("fallthrough")
1938 boolean isParameterizedTypePrefix() {
1939 int pos = 0, depth = 0;
1940 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1941 switch (t.kind) {
1942 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1943 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1944 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1945 case DOUBLE: case BOOLEAN: case CHAR:
1946 case MONKEYS_AT:
1947 break;
1948
1949 case LPAREN:
1950 // skip annotation values
1951 int nesting = 0;
1952 for (; ; pos++) {
1953 TokenKind tk2 = S.token(pos).kind;
1954 switch (tk2) {
1955 case EOF:
1956 return false;
1957 case LPAREN:
1958 nesting++;
3014 accept(SEMI);
3015 return List.of(toP(F.at(pos).Yield(t)));
3016 }
3017
3018 //else intentional fall-through
3019 } else {
3020 if (isNonSealedClassStart(true)) {
3021 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3022 nextToken();
3023 nextToken();
3024 nextToken();
3025 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3026 } else if (isSealedClassStart(true)) {
3027 checkSourceLevel(Feature.SEALED_CLASSES);
3028 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3029 nextToken();
3030 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3031 }
3032 }
3033 }
3034 if ((isValueModifier()) && allowValueClasses) {
3035 checkSourceLevel(Feature.VALUE_CLASSES);
3036 dc = token.docComment();
3037 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
3038 }
3039 dc = token.docComment();
3040 if (isRecordStart() && allowRecords) {
3041 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
3042 } else {
3043 Token prevToken = token;
3044 JCExpression t = term(EXPR | TYPE);
3045 if (token.kind == COLON && t.hasTag(IDENT)) {
3046 nextToken();
3047 JCStatement stat = parseStatementAsBlock();
3048 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
3049 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3050 pos = token.pos;
3051 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
3052 F.at(pos);
3053 return localVariableDeclarations(mods, t, dc);
3054 } else {
3055 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
3056 t = checkExprStat(t);
3057 accept(SEMI);
3058 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
3624 case ABSTRACT : flag = Flags.ABSTRACT; break;
3625 case NATIVE : flag = Flags.NATIVE; break;
3626 case VOLATILE : flag = Flags.VOLATILE; break;
3627 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3628 case STRICTFP : flag = Flags.STRICTFP; break;
3629 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3630 case DEFAULT : flag = Flags.DEFAULT; break;
3631 case ERROR : flag = 0; nextToken(); break;
3632 case IDENTIFIER : {
3633 if (isNonSealedClassStart(false)) {
3634 flag = Flags.NON_SEALED;
3635 nextToken();
3636 nextToken();
3637 break;
3638 }
3639 if (isSealedClassStart(false)) {
3640 checkSourceLevel(Feature.SEALED_CLASSES);
3641 flag = Flags.SEALED;
3642 break;
3643 }
3644 if (isValueModifier()) {
3645 checkSourceLevel(Feature.VALUE_CLASSES);
3646 flag = Flags.VALUE_CLASS;
3647 break;
3648 }
3649 break loop;
3650 }
3651 default: break loop;
3652 }
3653 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3654 lastPos = token.pos;
3655 nextToken();
3656 if (flag == Flags.ANNOTATION) {
3657 if (token.kind != INTERFACE) {
3658 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3659 // if first modifier is an annotation, set pos to annotation's.
3660 if (flags == 0 && annotations.isEmpty())
3661 pos = ann.pos;
3662 annotations.append(ann);
3663 flag = 0;
3664 }
3665 }
3666 flags |= flag;
3667 }
3668 switch (token.kind) {
3892 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3893 return Source.JDK10;
3894 } else if (shouldWarn) {
3895 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK10));
3896 }
3897 }
3898 if (name == names.yield) {
3899 if (allowYieldStatement) {
3900 return Source.JDK14;
3901 } else if (shouldWarn) {
3902 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK14));
3903 }
3904 }
3905 if (name == names.record) {
3906 if (allowRecords) {
3907 return Source.JDK14;
3908 } else if (shouldWarn) {
3909 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK14));
3910 }
3911 }
3912 if (name == names.value) {
3913 if (allowValueClasses) {
3914 return Source.JDK23;
3915 } else if (shouldWarn) {
3916 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK23));
3917 }
3918 }
3919 if (name == names.sealed) {
3920 if (allowSealedTypes) {
3921 return Source.JDK15;
3922 } else if (shouldWarn) {
3923 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3924 }
3925 }
3926 if (name == names.permits) {
3927 if (allowSealedTypes) {
3928 return Source.JDK15;
3929 } else if (shouldWarn) {
3930 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3931 }
3932 }
3933 return null;
3934 }
3935
3936 /** VariableDeclaratorId = Ident BracketsOpt
3937 */
3938 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
5019 Token next = S.token(3);
5020 return allowedAfterSealedOrNonSealed(next, local, true);
5021 }
5022 return false;
5023 }
5024
5025 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
5026 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
5027 Token tokenSub = S.token(lookAheadOffset + 1);
5028 Token tokenSealed = S.token(lookAheadOffset + 2);
5029 if (someToken.endPos == tokenSub.pos &&
5030 tokenSub.endPos == tokenSealed.pos &&
5031 tokenSealed.name() == names.sealed) {
5032 checkSourceLevel(Feature.SEALED_CLASSES);
5033 return true;
5034 }
5035 }
5036 return false;
5037 }
5038
5039 protected boolean isValueModifier() {
5040 if (token.kind == IDENTIFIER && token.name() == names.value) {
5041 boolean isValueModifier = false;
5042 Token next = S.token(1);
5043 switch (next.kind) {
5044 case PRIVATE: case PROTECTED: case PUBLIC: case STATIC: case TRANSIENT:
5045 case FINAL: case ABSTRACT: case NATIVE: case VOLATILE: case SYNCHRONIZED:
5046 case STRICTFP: case MONKEYS_AT: case DEFAULT: case BYTE: case SHORT:
5047 case CHAR: case INT: case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
5048 case CLASS: case INTERFACE: case ENUM:
5049 isValueModifier = true;
5050 break;
5051 case IDENTIFIER: // value record R || value value || new value Comparable() {} ??
5052 if (next.name() == names.record || next.name() == names.value
5053 || (mode & EXPR) != 0)
5054 isValueModifier = true;
5055 break;
5056 }
5057 if (isValueModifier) {
5058 checkSourceLevel(Feature.VALUE_CLASSES);
5059 return true;
5060 }
5061 }
5062 return false;
5063 }
5064
5065 protected boolean isSealedClassStart(boolean local) {
5066 if (token.name() == names.sealed) {
5067 Token next = S.token(1);
5068 if (allowedAfterSealedOrNonSealed(next, local, false)) {
5069 checkSourceLevel(Feature.SEALED_CLASSES);
5070 return true;
5071 }
5072 }
5073 return false;
5074 }
5075
5076 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
5077 return local ?
5078 switch (next.kind) {
5079 case MONKEYS_AT -> {
5080 Token afterNext = S.token(2);
5081 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5082 }
5083 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5084 default -> false;
5085 } :
5086 switch (next.kind) {
5087 case MONKEYS_AT -> {
5088 Token afterNext = S.token(2);
5089 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5090 }
5091 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5092 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) ||
5093 next.name() == names.sealed ||
5094 allowValueClasses && next.name() == names.value;
5095 default -> false;
5096 };
5097 }
5098
5099 /** MethodDeclaratorRest =
5100 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
5101 * VoidMethodDeclaratorRest =
5102 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
5103 * ConstructorDeclaratorRest =
5104 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
5105 */
5106 protected JCTree methodDeclaratorRest(int pos,
5107 JCModifiers mods,
5108 JCExpression type,
5109 Name name,
5110 List<JCTypeParameter> typarams,
5111 boolean isInterface, boolean isVoid,
5112 boolean isRecord,
5113 Comment dc) {
5114 if (isInterface) {
|