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;
1670 token.kind == MONKEYS_AT) {
1671 //error recovery, case like:
1672 //int i = expr.<missing-ident>
1673 //@Deprecated
1674 if (typeArgs != null) illegal();
1675 return toP(t);
1676 }
1677 if (tyannos != null && tyannos.nonEmpty()) {
1678 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1679 }
1680 break;
1681 case ELLIPSIS:
1682 if (this.permitTypeAnnotationsPushBack) {
1683 this.typeAnnotationsPushedBack = annos;
1684 } else if (annos.nonEmpty()) {
1685 // Don't return here -- error recovery attempt
1686 illegal(annos.head.pos);
1687 }
1688 break loop;
1689 case LT:
1690 if (!isMode(TYPE) && isUnboundMemberRef()) {
1691 //this is an unbound method reference whose qualifier
1692 //is a generic type i.e. A<S>::m
1693 int pos1 = token.pos;
1694 accept(LT);
1695 ListBuffer<JCExpression> args = new ListBuffer<>();
1696 args.append(typeArgument());
1697 while (token.kind == COMMA) {
1698 nextToken();
1699 args.append(typeArgument());
1700 }
1701 accept(GT);
1702 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1703 while (token.kind == DOT) {
1704 nextToken();
1705 selectTypeMode();
1706 t = toP(F.at(token.pos).Select(t, ident()));
1707 t = typeArgumentsOpt(t);
1708 }
1709 t = bracketsOpt(t);
1710 if (token.kind != COLCOL) {
1711 //method reference expected here
1916 return illegal(annos.head.pos);
1917 }
1918 break;
1919 }
1920 }
1921 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1922 selectExprMode();
1923 t = to(F.at(token.pos).Unary(
1924 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1925 nextToken();
1926 }
1927 return toP(t);
1928 }
1929
1930 /**
1931 * If we see an identifier followed by a '<' it could be an unbound
1932 * method reference or a binary expression. To disambiguate, look for a
1933 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1934 */
1935 @SuppressWarnings("fallthrough")
1936 boolean isUnboundMemberRef() {
1937 int pos = 0, depth = 0;
1938 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1939 switch (t.kind) {
1940 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1941 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1942 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1943 case DOUBLE: case BOOLEAN: case CHAR:
1944 case MONKEYS_AT:
1945 break;
1946
1947 case LPAREN:
1948 // skip annotation values
1949 int nesting = 0;
1950 for (; ; pos++) {
1951 TokenKind tk2 = S.token(pos).kind;
1952 switch (tk2) {
1953 case EOF:
1954 return false;
1955 case LPAREN:
1956 nesting++;
3012 accept(SEMI);
3013 return List.of(toP(F.at(pos).Yield(t)));
3014 }
3015
3016 //else intentional fall-through
3017 } else {
3018 if (isNonSealedClassStart(true)) {
3019 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3020 nextToken();
3021 nextToken();
3022 nextToken();
3023 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3024 } else if (isSealedClassStart(true)) {
3025 checkSourceLevel(Feature.SEALED_CLASSES);
3026 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3027 nextToken();
3028 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3029 }
3030 }
3031 }
3032 dc = token.docComment();
3033 if (isRecordStart() && allowRecords) {
3034 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
3035 } else {
3036 Token prevToken = token;
3037 JCExpression t = term(EXPR | TYPE);
3038 if (token.kind == COLON && t.hasTag(IDENT)) {
3039 nextToken();
3040 JCStatement stat = parseStatementAsBlock();
3041 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
3042 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3043 pos = token.pos;
3044 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
3045 F.at(pos);
3046 return localVariableDeclarations(mods, t, dc);
3047 } else {
3048 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
3049 t = checkExprStat(t);
3050 accept(SEMI);
3051 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
3617 case ABSTRACT : flag = Flags.ABSTRACT; break;
3618 case NATIVE : flag = Flags.NATIVE; break;
3619 case VOLATILE : flag = Flags.VOLATILE; break;
3620 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3621 case STRICTFP : flag = Flags.STRICTFP; break;
3622 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3623 case DEFAULT : flag = Flags.DEFAULT; break;
3624 case ERROR : flag = 0; nextToken(); break;
3625 case IDENTIFIER : {
3626 if (isNonSealedClassStart(false)) {
3627 flag = Flags.NON_SEALED;
3628 nextToken();
3629 nextToken();
3630 break;
3631 }
3632 if (isSealedClassStart(false)) {
3633 checkSourceLevel(Feature.SEALED_CLASSES);
3634 flag = Flags.SEALED;
3635 break;
3636 }
3637 break loop;
3638 }
3639 default: break loop;
3640 }
3641 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3642 lastPos = token.pos;
3643 nextToken();
3644 if (flag == Flags.ANNOTATION) {
3645 if (token.kind != INTERFACE) {
3646 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3647 // if first modifier is an annotation, set pos to annotation's.
3648 if (flags == 0 && annotations.isEmpty())
3649 pos = ann.pos;
3650 annotations.append(ann);
3651 flag = 0;
3652 }
3653 }
3654 flags |= flag;
3655 }
3656 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.sealed) {
3901 if (allowSealedTypes) {
3902 return Source.JDK15;
3903 } else if (shouldWarn) {
3904 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3905 }
3906 }
3907 if (name == names.permits) {
3908 if (allowSealedTypes) {
3909 return Source.JDK15;
3910 } else if (shouldWarn) {
3911 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3912 }
3913 }
3914 return null;
3915 }
3916
3917 /** VariableDeclaratorId = Ident BracketsOpt
3918 */
3919 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
5001 Token next = S.token(3);
5002 return allowedAfterSealedOrNonSealed(next, local, true);
5003 }
5004 return false;
5005 }
5006
5007 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
5008 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
5009 Token tokenSub = S.token(lookAheadOffset + 1);
5010 Token tokenSealed = S.token(lookAheadOffset + 2);
5011 if (someToken.endPos == tokenSub.pos &&
5012 tokenSub.endPos == tokenSealed.pos &&
5013 tokenSealed.name() == names.sealed) {
5014 checkSourceLevel(Feature.SEALED_CLASSES);
5015 return true;
5016 }
5017 }
5018 return false;
5019 }
5020
5021 protected boolean isSealedClassStart(boolean local) {
5022 if (token.name() == names.sealed) {
5023 Token next = S.token(1);
5024 if (allowedAfterSealedOrNonSealed(next, local, false)) {
5025 checkSourceLevel(Feature.SEALED_CLASSES);
5026 return true;
5027 }
5028 }
5029 return false;
5030 }
5031
5032 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
5033 return local ?
5034 switch (next.kind) {
5035 case MONKEYS_AT -> {
5036 Token afterNext = S.token(2);
5037 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5038 }
5039 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5040 default -> false;
5041 } :
5042 switch (next.kind) {
5043 case MONKEYS_AT -> {
5044 Token afterNext = S.token(2);
5045 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5046 }
5047 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5048 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) || next.name() == names.sealed;
5049 default -> false;
5050 };
5051 }
5052
5053 /** MethodDeclaratorRest =
5054 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
5055 * VoidMethodDeclaratorRest =
5056 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
5057 * ConstructorDeclaratorRest =
5058 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
5059 */
5060 protected JCTree methodDeclaratorRest(int pos,
5061 JCModifiers mods,
5062 JCExpression type,
5063 Name name,
5064 List<JCTypeParameter> typarams,
5065 boolean isInterface, boolean isVoid,
5066 boolean isRecord,
5067 Comment dc) {
5068 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;
1682 token.kind == MONKEYS_AT) {
1683 //error recovery, case like:
1684 //int i = expr.<missing-ident>
1685 //@Deprecated
1686 if (typeArgs != null) illegal();
1687 return toP(t);
1688 }
1689 if (tyannos != null && tyannos.nonEmpty()) {
1690 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1691 }
1692 break;
1693 case ELLIPSIS:
1694 if (this.permitTypeAnnotationsPushBack) {
1695 this.typeAnnotationsPushedBack = annos;
1696 } else if (annos.nonEmpty()) {
1697 // Don't return here -- error recovery attempt
1698 illegal(annos.head.pos);
1699 }
1700 break loop;
1701 case LT:
1702 if (!isMode(TYPE) && isParameterizedTypePrefix()) {
1703 //this is either an unbound method reference whose qualifier
1704 //is a generic type i.e. A<S>::m
1705 int pos1 = token.pos;
1706 accept(LT);
1707 ListBuffer<JCExpression> args = new ListBuffer<>();
1708 args.append(typeArgument());
1709 while (token.kind == COMMA) {
1710 nextToken();
1711 args.append(typeArgument());
1712 }
1713 accept(GT);
1714 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1715 while (token.kind == DOT) {
1716 nextToken();
1717 selectTypeMode();
1718 t = toP(F.at(token.pos).Select(t, ident()));
1719 t = typeArgumentsOpt(t);
1720 }
1721 t = bracketsOpt(t);
1722 if (token.kind != COLCOL) {
1723 //method reference expected here
1928 return illegal(annos.head.pos);
1929 }
1930 break;
1931 }
1932 }
1933 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1934 selectExprMode();
1935 t = to(F.at(token.pos).Unary(
1936 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1937 nextToken();
1938 }
1939 return toP(t);
1940 }
1941
1942 /**
1943 * If we see an identifier followed by a '<' it could be an unbound
1944 * method reference or a binary expression. To disambiguate, look for a
1945 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1946 */
1947 @SuppressWarnings("fallthrough")
1948 boolean isParameterizedTypePrefix() {
1949 int pos = 0, depth = 0;
1950 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1951 switch (t.kind) {
1952 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1953 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1954 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1955 case DOUBLE: case BOOLEAN: case CHAR:
1956 case MONKEYS_AT:
1957 break;
1958
1959 case LPAREN:
1960 // skip annotation values
1961 int nesting = 0;
1962 for (; ; pos++) {
1963 TokenKind tk2 = S.token(pos).kind;
1964 switch (tk2) {
1965 case EOF:
1966 return false;
1967 case LPAREN:
1968 nesting++;
3024 accept(SEMI);
3025 return List.of(toP(F.at(pos).Yield(t)));
3026 }
3027
3028 //else intentional fall-through
3029 } else {
3030 if (isNonSealedClassStart(true)) {
3031 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3032 nextToken();
3033 nextToken();
3034 nextToken();
3035 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3036 } else if (isSealedClassStart(true)) {
3037 checkSourceLevel(Feature.SEALED_CLASSES);
3038 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
3039 nextToken();
3040 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
3041 }
3042 }
3043 }
3044 if ((isValueModifier()) && allowValueClasses) {
3045 checkSourceLevel(Feature.VALUE_CLASSES);
3046 dc = token.docComment();
3047 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
3048 }
3049 dc = token.docComment();
3050 if (isRecordStart() && allowRecords) {
3051 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
3052 } else {
3053 Token prevToken = token;
3054 JCExpression t = term(EXPR | TYPE);
3055 if (token.kind == COLON && t.hasTag(IDENT)) {
3056 nextToken();
3057 JCStatement stat = parseStatementAsBlock();
3058 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
3059 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3060 pos = token.pos;
3061 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
3062 F.at(pos);
3063 return localVariableDeclarations(mods, t, dc);
3064 } else {
3065 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
3066 t = checkExprStat(t);
3067 accept(SEMI);
3068 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
3634 case ABSTRACT : flag = Flags.ABSTRACT; break;
3635 case NATIVE : flag = Flags.NATIVE; break;
3636 case VOLATILE : flag = Flags.VOLATILE; break;
3637 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3638 case STRICTFP : flag = Flags.STRICTFP; break;
3639 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3640 case DEFAULT : flag = Flags.DEFAULT; break;
3641 case ERROR : flag = 0; nextToken(); break;
3642 case IDENTIFIER : {
3643 if (isNonSealedClassStart(false)) {
3644 flag = Flags.NON_SEALED;
3645 nextToken();
3646 nextToken();
3647 break;
3648 }
3649 if (isSealedClassStart(false)) {
3650 checkSourceLevel(Feature.SEALED_CLASSES);
3651 flag = Flags.SEALED;
3652 break;
3653 }
3654 if (isValueModifier()) {
3655 checkSourceLevel(Feature.VALUE_CLASSES);
3656 flag = Flags.VALUE_CLASS;
3657 break;
3658 }
3659 break loop;
3660 }
3661 default: break loop;
3662 }
3663 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3664 lastPos = token.pos;
3665 nextToken();
3666 if (flag == Flags.ANNOTATION) {
3667 if (token.kind != INTERFACE) {
3668 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3669 // if first modifier is an annotation, set pos to annotation's.
3670 if (flags == 0 && annotations.isEmpty())
3671 pos = ann.pos;
3672 annotations.append(ann);
3673 flag = 0;
3674 }
3675 }
3676 flags |= flag;
3677 }
3678 switch (token.kind) {
3902 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3903 return Source.JDK10;
3904 } else if (shouldWarn) {
3905 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK10));
3906 }
3907 }
3908 if (name == names.yield) {
3909 if (allowYieldStatement) {
3910 return Source.JDK14;
3911 } else if (shouldWarn) {
3912 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK14));
3913 }
3914 }
3915 if (name == names.record) {
3916 if (allowRecords) {
3917 return Source.JDK14;
3918 } else if (shouldWarn) {
3919 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK14));
3920 }
3921 }
3922 if (name == names.value) {
3923 if (allowValueClasses) {
3924 return Source.JDK23;
3925 } else if (shouldWarn) {
3926 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK23));
3927 }
3928 }
3929 if (name == names.sealed) {
3930 if (allowSealedTypes) {
3931 return Source.JDK15;
3932 } else if (shouldWarn) {
3933 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3934 }
3935 }
3936 if (name == names.permits) {
3937 if (allowSealedTypes) {
3938 return Source.JDK15;
3939 } else if (shouldWarn) {
3940 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3941 }
3942 }
3943 return null;
3944 }
3945
3946 /** VariableDeclaratorId = Ident BracketsOpt
3947 */
3948 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
5030 Token next = S.token(3);
5031 return allowedAfterSealedOrNonSealed(next, local, true);
5032 }
5033 return false;
5034 }
5035
5036 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
5037 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
5038 Token tokenSub = S.token(lookAheadOffset + 1);
5039 Token tokenSealed = S.token(lookAheadOffset + 2);
5040 if (someToken.endPos == tokenSub.pos &&
5041 tokenSub.endPos == tokenSealed.pos &&
5042 tokenSealed.name() == names.sealed) {
5043 checkSourceLevel(Feature.SEALED_CLASSES);
5044 return true;
5045 }
5046 }
5047 return false;
5048 }
5049
5050 protected boolean isValueModifier() {
5051 if (token.kind == IDENTIFIER && token.name() == names.value) {
5052 boolean isValueModifier = false;
5053 Token next = S.token(1);
5054 switch (next.kind) {
5055 case PRIVATE: case PROTECTED: case PUBLIC: case STATIC: case TRANSIENT:
5056 case FINAL: case ABSTRACT: case NATIVE: case VOLATILE: case SYNCHRONIZED:
5057 case STRICTFP: case MONKEYS_AT: case DEFAULT: case BYTE: case SHORT:
5058 case CHAR: case INT: case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
5059 case CLASS: case INTERFACE: case ENUM:
5060 isValueModifier = true;
5061 break;
5062 case IDENTIFIER: // value record R || value value || new value Comparable() {} ??
5063 if (next.name() == names.record || next.name() == names.value
5064 || (mode & EXPR) != 0)
5065 isValueModifier = true;
5066 break;
5067 }
5068 if (isValueModifier) {
5069 checkSourceLevel(Feature.VALUE_CLASSES);
5070 return true;
5071 }
5072 }
5073 return false;
5074 }
5075
5076 protected boolean isSealedClassStart(boolean local) {
5077 if (token.name() == names.sealed) {
5078 Token next = S.token(1);
5079 if (allowedAfterSealedOrNonSealed(next, local, false)) {
5080 checkSourceLevel(Feature.SEALED_CLASSES);
5081 return true;
5082 }
5083 }
5084 return false;
5085 }
5086
5087 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
5088 return local ?
5089 switch (next.kind) {
5090 case MONKEYS_AT -> {
5091 Token afterNext = S.token(2);
5092 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5093 }
5094 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5095 default -> false;
5096 } :
5097 switch (next.kind) {
5098 case MONKEYS_AT -> {
5099 Token afterNext = S.token(2);
5100 yield afterNext.kind != INTERFACE || currentIsNonSealed;
5101 }
5102 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
5103 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) ||
5104 next.name() == names.sealed ||
5105 allowValueClasses && next.name() == names.value;
5106 default -> false;
5107 };
5108 }
5109
5110 /** MethodDeclaratorRest =
5111 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
5112 * VoidMethodDeclaratorRest =
5113 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
5114 * ConstructorDeclaratorRest =
5115 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
5116 */
5117 protected JCTree methodDeclaratorRest(int pos,
5118 JCModifiers mods,
5119 JCExpression type,
5120 Name name,
5121 List<JCTypeParameter> typarams,
5122 boolean isInterface, boolean isVoid,
5123 boolean isRecord,
5124 Comment dc) {
5125 if (isInterface) {
|