1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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.Warnings;
46 import com.sun.tools.javac.tree.*;
47 import com.sun.tools.javac.tree.JCTree.*;
48 import com.sun.tools.javac.util.*;
49 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
50 import com.sun.tools.javac.util.JCDiagnostic.Error;
51 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
52 import com.sun.tools.javac.util.List;
53
54 import static com.sun.tools.javac.parser.Tokens.TokenKind.*;
55 import static com.sun.tools.javac.parser.Tokens.TokenKind.ASSERT;
56 import static com.sun.tools.javac.parser.Tokens.TokenKind.CASE;
57 import static com.sun.tools.javac.parser.Tokens.TokenKind.CATCH;
58 import static com.sun.tools.javac.parser.Tokens.TokenKind.EQ;
59 import static com.sun.tools.javac.parser.Tokens.TokenKind.GT;
60 import static com.sun.tools.javac.parser.Tokens.TokenKind.IMPORT;
61 import static com.sun.tools.javac.parser.Tokens.TokenKind.LT;
62 import static com.sun.tools.javac.tree.JCTree.Tag.*;
63 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.ImplicitAndExplicitNotAllowed;
64 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndExplicitNotAllowed;
65 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndImplicitNotAllowed;
66 import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;
67
68 /**
69 * The parser maps a token sequence into an abstract syntax tree.
70 * The parser is a hand-written recursive-descent parser that
71 * implements the grammar described in the Java Language Specification.
72 * For efficiency reasons, an operator precedence scheme is used
73 * for parsing binary operation expressions.
74 *
75 * <p><b>This is NOT part of any supported API.
76 * If you write code that depends on this, you do so at your own risk.
77 * This code and its internal interfaces are subject to change or
78 * deletion without notice.</b>
79 */
80 public class JavacParser implements Parser {
81
82 /** The number of precedence levels of infix operators.
83 */
84 private static final int infixPrecedenceLevels = 10;
85
86 /** Is the parser instantiated to parse a module-info file ?
87 */
88 private final boolean parseModuleInfo;
89
90 /** The scanner used for lexical analysis.
91 */
92 protected Lexer S;
93
94 /** The factory to be used for abstract syntax tree construction.
95 */
96 protected TreeMaker F;
97
98 /** The log to be used for error diagnostics.
99 */
100 private Log log;
101
102 /** The Source language setting. */
103 private Source source;
104
105 /** The Preview language setting. */
106 private Preview preview;
107
108 /** The name table. */
109 private Names names;
110
111 /** End position mappings container */
112 protected final AbstractEndPosTable endPosTable;
113
114 // Because of javac's limited lookahead, some contexts are ambiguous in
115 // the presence of type annotations even though they are not ambiguous
116 // in the absence of type annotations. Consider this code:
117 // void m(String [] m) { }
118 // void m(String ... m) { }
119 // After parsing "String", javac calls bracketsOpt which immediately
120 // returns if the next character is not '['. Similarly, javac can see
121 // if the next token is ... and in that case parse an ellipsis. But in
122 // the presence of type annotations:
123 // void m(String @A [] m) { }
124 // void m(String @A ... m) { }
125 // no finite lookahead is enough to determine whether to read array
126 // levels or an ellipsis. Furthermore, if you call bracketsOpt, then
127 // bracketsOpt first reads all the leading annotations and only then
128 // discovers that it needs to fail. bracketsOpt needs a way to push
129 // back the extra annotations that it read. (But, bracketsOpt should
130 // not *always* be allowed to push back extra annotations that it finds
131 // -- in most contexts, any such extra annotation is an error.
132 //
133 // The following two variables permit type annotations that have
134 // already been read to be stored for later use. Alternate
135 // implementations are possible but would cause much larger changes to
136 // the parser.
137
138 /** Type annotations that have already been read but have not yet been used. **/
139 private List<JCAnnotation> typeAnnotationsPushedBack = List.nil();
140
141 /**
142 * If the parser notices extra annotations, then it either immediately
143 * issues an error (if this variable is false) or places the extra
144 * annotations in variable typeAnnotationsPushedBack (if this variable
145 * is true).
146 */
147 private boolean permitTypeAnnotationsPushBack = false;
148
149 interface ErrorRecoveryAction {
150 JCTree doRecover(JavacParser parser);
151 }
152
153 enum BasicErrorRecoveryAction implements ErrorRecoveryAction {
154 BLOCK_STMT {public JCTree doRecover(JavacParser parser) { return parser.parseStatementAsBlock(); }},
155 CATCH_CLAUSE {public JCTree doRecover(JavacParser parser) { return parser.catchClause(); }}
156 }
157
158 /** Construct a parser from a given scanner, tree factory and log.
159 */
160 protected JavacParser(ParserFactory fac,
161 Lexer S,
162 boolean keepDocComments,
163 boolean keepLineMap,
164 boolean keepEndPositions) {
165 this(fac, S, keepDocComments, keepLineMap, keepEndPositions, false);
166
167 }
168 /** Construct a parser from a given scanner, tree factory and log.
169 */
170 @SuppressWarnings("this-escape")
171 protected JavacParser(ParserFactory fac,
172 Lexer S,
173 boolean keepDocComments,
174 boolean keepLineMap,
175 boolean keepEndPositions,
176 boolean parseModuleInfo) {
177 this.S = S;
178 nextToken(); // prime the pump
179 this.F = fac.F;
180 this.log = fac.log;
181 this.names = fac.names;
182 this.source = fac.source;
183 this.preview = fac.preview;
184 this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
185 this.keepDocComments = keepDocComments;
186 this.parseModuleInfo = parseModuleInfo;
187 this.docComments = newDocCommentTable(keepDocComments, fac);
188 this.keepLineMap = keepLineMap;
189 this.errorTree = F.Erroneous();
190 this.endPosTable = newEndPosTable(keepEndPositions);
191 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
192 this.allowRecords = Feature.RECORDS.allowedInSource(source);
193 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
194 }
195
196 /** Construct a parser from an existing parser, with minimal overhead.
197 */
198 @SuppressWarnings("this-escape")
199 protected JavacParser(JavacParser parser,
200 Lexer S) {
201 this.S = S;
202 this.token = parser.token;
203 this.F = parser.F;
204 this.log = parser.log;
205 this.names = parser.names;
206 this.source = parser.source;
207 this.preview = parser.preview;
208 this.allowStringFolding = parser.allowStringFolding;
209 this.keepDocComments = false;
210 this.parseModuleInfo = false;
211 this.docComments = null;
212 this.errorTree = F.Erroneous();
213 this.endPosTable = newEndPosTable(false);
214 this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
215 this.allowRecords = Feature.RECORDS.allowedInSource(source);
216 this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
217 }
218
219 protected AbstractEndPosTable newEndPosTable(boolean keepEndPositions) {
220 return keepEndPositions
221 ? new SimpleEndPosTable(this)
222 : new EmptyEndPosTable(this);
223 }
224
225 protected DocCommentTable newDocCommentTable(boolean keepDocComments, ParserFactory fac) {
226 return keepDocComments ? new LazyDocCommentTable(fac) : null;
227 }
228
229 /** Switch: should we fold strings?
230 */
231 boolean allowStringFolding;
232
233 /** Switch: should we keep docComments?
234 */
235 boolean keepDocComments;
236
237 /** Switch: should we keep line table?
238 */
239 boolean keepLineMap;
240
241 /** Switch: is "this" allowed as an identifier?
242 * This is needed to parse receiver types.
243 */
244 boolean allowThisIdent;
245
246 /** Switch: is yield statement allowed in this source level?
247 */
248 boolean allowYieldStatement;
249
250 /** Switch: are records allowed in this source level?
251 */
252 boolean allowRecords;
253
254 /** Switch: are sealed types allowed in this source level?
255 */
256 boolean allowSealedTypes;
257
258 /** The type of the method receiver, as specified by a first "this" parameter.
259 */
260 JCVariableDecl receiverParam;
261
262 /** When terms are parsed, the mode determines which is expected:
263 * mode = EXPR : an expression
264 * mode = TYPE : a type
265 * mode = NOPARAMS : no parameters allowed for type
266 * mode = TYPEARG : type argument
267 * mode |= NOLAMBDA : lambdas are not allowed
268 */
269 protected static final int EXPR = 1 << 0;
270 protected static final int TYPE = 1 << 1;
271 protected static final int NOPARAMS = 1 << 2;
272 protected static final int TYPEARG = 1 << 3;
273 protected static final int DIAMOND = 1 << 4;
274 protected static final int NOLAMBDA = 1 << 5;
275
276 protected void setMode(int mode) {
277 this.mode = mode;
278 }
279
280 protected void setLastMode(int mode) {
281 lastmode = mode;
282 }
283
284 protected boolean isMode(int mode) {
285 return (this.mode & mode) != 0;
286 }
287
288 protected boolean wasTypeMode() {
289 return (lastmode & TYPE) != 0;
290 }
291
292 protected void selectExprMode() {
293 setMode((mode & NOLAMBDA) | EXPR);
294 }
295
296 protected void selectTypeMode() {
297 setMode((mode & NOLAMBDA) | TYPE);
298 }
299
300 /** The current mode.
301 */
302 protected int mode = 0;
303
304 /** The mode of the term that was parsed last.
305 */
306 protected int lastmode = 0;
307
308 /* ---------- token management -------------- */
309
310 protected Token token;
311
312 public Token token() {
313 return token;
314 }
315
316 public void nextToken() {
317 S.nextToken();
318 token = S.token();
319 }
320
321 protected boolean peekToken(Predicate<TokenKind> tk) {
322 return peekToken(0, tk);
323 }
324
325 protected boolean peekToken(int lookahead, Predicate<TokenKind> tk) {
326 return tk.test(S.token(lookahead + 1).kind);
327 }
328
329 protected boolean peekToken(Predicate<TokenKind> tk1, Predicate<TokenKind> tk2) {
330 return peekToken(0, tk1, tk2);
331 }
332
333 protected boolean peekToken(int lookahead, Predicate<TokenKind> tk1, Predicate<TokenKind> tk2) {
334 return tk1.test(S.token(lookahead + 1).kind) &&
335 tk2.test(S.token(lookahead + 2).kind);
336 }
337
338 protected boolean peekToken(Predicate<TokenKind> tk1, Predicate<TokenKind> tk2, Predicate<TokenKind> tk3) {
339 return peekToken(0, tk1, tk2, tk3);
340 }
341
342 protected boolean peekToken(int lookahead, Predicate<TokenKind> tk1, Predicate<TokenKind> tk2, Predicate<TokenKind> tk3) {
343 return tk1.test(S.token(lookahead + 1).kind) &&
344 tk2.test(S.token(lookahead + 2).kind) &&
345 tk3.test(S.token(lookahead + 3).kind);
346 }
347
348 @SuppressWarnings("unchecked")
349 protected boolean peekToken(Predicate<TokenKind>... kinds) {
350 return peekToken(0, kinds);
351 }
352
353 @SuppressWarnings("unchecked")
354 protected boolean peekToken(int lookahead, Predicate<TokenKind>... kinds) {
355 for (Predicate<TokenKind> kind : kinds) {
356 if (!kind.test(S.token(++lookahead).kind)) {
357 return false;
358 }
359 }
360 return true;
361 }
362
363 /* ---------- error recovery -------------- */
364
365 private JCErroneous errorTree;
366
367 /** Skip forward until a suitable stop token is found.
368 */
369 protected void skip(boolean stopAtImport, boolean stopAtMemberDecl, boolean stopAtIdentifier, boolean stopAtStatement) {
370 while (true) {
371 switch (token.kind) {
372 case SEMI:
373 nextToken();
374 return;
375 case PUBLIC:
376 case FINAL:
377 case ABSTRACT:
378 case MONKEYS_AT:
379 case EOF:
380 case CLASS:
381 case INTERFACE:
382 case ENUM:
383 return;
384 case IMPORT:
385 if (stopAtImport)
386 return;
387 break;
388 case LBRACE:
389 case RBRACE:
390 case PRIVATE:
391 case PROTECTED:
392 case STATIC:
393 case TRANSIENT:
394 case NATIVE:
395 case VOLATILE:
396 case SYNCHRONIZED:
397 case STRICTFP:
398 case LT:
399 case BYTE:
400 case SHORT:
401 case CHAR:
402 case INT:
403 case LONG:
404 case FLOAT:
405 case DOUBLE:
406 case BOOLEAN:
407 case VOID:
408 if (stopAtMemberDecl)
409 return;
410 break;
411 case UNDERSCORE:
412 case IDENTIFIER:
413 if (stopAtIdentifier)
414 return;
415 break;
416 case CASE:
417 case DEFAULT:
418 case IF:
419 case FOR:
420 case WHILE:
421 case DO:
422 case TRY:
423 case SWITCH:
424 case RETURN:
425 case THROW:
426 case BREAK:
427 case CONTINUE:
428 case ELSE:
429 case FINALLY:
430 case CATCH:
431 case THIS:
432 case SUPER:
433 case NEW:
434 if (stopAtStatement)
435 return;
436 break;
437 case ASSERT:
438 if (stopAtStatement)
439 return;
440 break;
441 }
442 nextToken();
443 }
444 }
445
446 protected JCErroneous syntaxError(int pos, Error errorKey) {
447 return syntaxError(pos, List.nil(), errorKey);
448 }
449
450 protected JCErroneous syntaxError(int pos, List<JCTree> errs, Error errorKey) {
451 setErrorEndPos(pos);
452 JCErroneous err = F.at(pos).Erroneous(errs);
453 reportSyntaxError(err, errorKey);
454 if (errs != null) {
455 JCTree last = errs.last();
456 if (last != null)
457 storeEnd(last, pos);
458 }
459 return toP(err);
460 }
461
462 private static final int RECOVERY_THRESHOLD = 50;
463 private int errorPos = Position.NOPOS;
464 private int count = 0;
465
466 /**
467 * Report a syntax using the given the position parameter and arguments,
468 * unless one was already reported at the same position.
469 */
470 protected void reportSyntaxError(int pos, Error errorKey) {
471 JCDiagnostic.DiagnosticPosition diag = new JCDiagnostic.SimpleDiagnosticPosition(pos);
472 reportSyntaxError(diag, errorKey);
473 }
474
475 /**
476 * Report a syntax error using the given DiagnosticPosition object and
477 * arguments, unless one was already reported at the same position.
478 */
479 protected void reportSyntaxError(JCDiagnostic.DiagnosticPosition diagPos, Error errorKey) {
480 int pos = diagPos.getPreferredPosition();
481 if (pos > S.errPos() || pos == Position.NOPOS) {
482 if (token.kind == EOF) {
483 log.error(DiagnosticFlag.SYNTAX, diagPos, Errors.PrematureEof);
484 } else {
485 log.error(DiagnosticFlag.SYNTAX, diagPos, errorKey);
486 }
487 }
488 S.errPos(pos);
489 if (token.pos == errorPos && token.kind != EOF) {
490 //check for a possible infinite loop in parsing:
491 Assert.check(count++ < RECOVERY_THRESHOLD);
492 } else {
493 count = 0;
494 errorPos = token.pos;
495 }
496 }
497
498 /** If next input token matches given token, skip it, otherwise report
499 * an error.
500 */
501 public void accept(TokenKind tk) {
502 accept(tk, Errors::Expected);
503 }
504
505 /** If next input token matches given token, skip it, otherwise report
506 * an error.
507 */
508 public void accept(TokenKind tk, Function<TokenKind, Error> errorProvider) {
509 if (token.kind == tk) {
510 nextToken();
511 } else {
512 setErrorEndPos(token.pos);
513 reportSyntaxError(S.prevToken().endPos, errorProvider.apply(tk));
514 }
515 }
516
517 /** Report an illegal start of expression/type error at given position.
518 */
519 JCExpression illegal(int pos) {
520 setErrorEndPos(pos);
521 if (isMode(EXPR))
522 return syntaxError(pos, Errors.IllegalStartOfExpr);
523 else
524 return syntaxError(pos, Errors.IllegalStartOfType);
525
526 }
527
528 /** Report an illegal start of expression/type error at current position.
529 */
530 JCExpression illegal() {
531 return illegal(token.pos);
532 }
533
534 /** Diagnose a modifier flag from the set, if any. */
535 protected void checkNoMods(long mods) {
536 checkNoMods(token.pos, mods);
537 }
538
539 protected void checkNoMods(int pos, long mods) {
540 if (mods != 0) {
541 long lowestMod = mods & -mods;
542 log.error(DiagnosticFlag.SYNTAX, pos, Errors.ModNotAllowedHere(Flags.asFlagSet(lowestMod)));
543 }
544 }
545
546 /* ---------- doc comments --------- */
547
548 /** A table to store all documentation comments
549 * indexed by the tree nodes they refer to.
550 * defined only if option flag keepDocComment is set.
551 */
552 private final DocCommentTable docComments;
553
554 /** Make an entry into docComments hashtable,
555 * provided flag keepDocComments is set and given doc comment is non-null.
556 * @param tree The tree to be used as index in the hashtable
557 * @param dc The doc comment to associate with the tree, or null.
558 */
559 protected void attach(JCTree tree, Comment dc) {
560 if (keepDocComments && dc != null) {
561 // System.out.println("doc comment = ");System.out.println(dc);//DEBUG
562 docComments.putComment(tree, dc);
563 }
564 }
565
566 /* -------- source positions ------- */
567
568 protected void setErrorEndPos(int errPos) {
569 endPosTable.setErrorEndPos(errPos);
570 }
571
572 protected void storeEnd(JCTree tree, int endpos) {
573 endPosTable.storeEnd(tree, endpos);
574 }
575
576 protected <T extends JCTree> T to(T t) {
577 return endPosTable.to(t);
578 }
579
580 protected <T extends JCTree> T toP(T t) {
581 return endPosTable.toP(t);
582 }
583
584 /** Get the start position for a tree node. The start position is
585 * defined to be the position of the first character of the first
586 * token of the node's source text.
587 * @param tree The tree node
588 */
589 public int getStartPos(JCTree tree) {
590 return TreeInfo.getStartPos(tree);
591 }
592
593 /**
594 * Get the end position for a tree node. The end position is
595 * defined to be the position of the last character of the last
596 * token of the node's source text. Returns Position.NOPOS if end
597 * positions are not generated or the position is otherwise not
598 * found.
599 * @param tree The tree node
600 */
601 public int getEndPos(JCTree tree) {
602 return endPosTable.getEndPos(tree);
603 }
604
605
606
607 /* ---------- parsing -------------- */
608
609 /**
610 * Ident = IDENTIFIER
611 */
612 public Name ident() {
613 return ident(false);
614 }
615
616 protected Name ident(boolean allowClass) {
617 return ident(allowClass, false);
618 }
619
620 public Name identOrUnderscore() {
621 return ident(false, true);
622 }
623
624 protected Name ident(boolean allowClass, boolean asVariable) {
625 if (token.kind == IDENTIFIER) {
626 Name name = token.name();
627 nextToken();
628 return name;
629 } else if (token.kind == ASSERT) {
630 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.AssertAsIdentifier);
631 nextToken();
632 return names.error;
633 } else if (token.kind == ENUM) {
634 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.EnumAsIdentifier);
635 nextToken();
636 return names.error;
637 } else if (token.kind == THIS) {
638 if (allowThisIdent) {
639 Name name = token.name();
640 nextToken();
641 return name;
642 } else {
643 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.ThisAsIdentifier);
644 nextToken();
645 return names.error;
646 }
647 } else if (token.kind == UNDERSCORE) {
648 if (Feature.UNDERSCORE_IDENTIFIER.allowedInSource(source)) {
649 log.warning(token.pos, Warnings.UnderscoreAsIdentifier);
650 } else if (asVariable) {
651 checkSourceLevel(Feature.UNNAMED_VARIABLES);
652 if (peekToken(LBRACKET)) {
653 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.UseOfUnderscoreNotAllowedWithBrackets);
654 }
655 } else {
656 if (Feature.UNNAMED_VARIABLES.allowedInSource(source)) {
657 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.UseOfUnderscoreNotAllowedNonVariable);
658 } else {
659 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.UnderscoreAsIdentifier);
660 }
661 }
662 Name name = token.name();
663 nextToken();
664 return name;
665 } else {
666 accept(IDENTIFIER);
667 if (allowClass && token.kind == CLASS) {
668 nextToken();
669 return names._class;
670 }
671 return names.error;
672 }
673 }
674
675 /**
676 * Qualident = Ident { DOT [Annotations] Ident }
677 */
678 public JCExpression qualident(boolean allowAnnos) {
679 JCExpression t = toP(F.at(token.pos).Ident(ident()));
680 while (token.kind == DOT) {
681 int pos = token.pos;
682 nextToken();
683 List<JCAnnotation> tyannos = null;
684 if (allowAnnos) {
685 tyannos = typeAnnotationsOpt();
686 }
687 t = toP(F.at(pos).Select(t, ident()));
688 if (tyannos != null && tyannos.nonEmpty()) {
689 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
690 }
691 }
692 return t;
693 }
694
695 /**
696 * StringTemplate =
697 * [STRINGFRAGMENT] [EmbeddedExpression]
698 * | STRINGLITERAL
699 *
700 * EmbeddedExpression =
701 * LBRACE term RBRACE
702 */
703 JCExpression stringTemplate(JCExpression processor) {
704 checkSourceLevel(Feature.STRING_TEMPLATES);
705 // Disable standalone string templates
706 if (processor == null) {
707 log.error(DiagnosticFlag.SYNTAX, token.pos,
708 Errors.ProcessorMissingFromStringTemplateExpression);
709 }
710 int oldmode = mode;
711 selectExprMode();
712 Token stringToken = token;
713 int pos = stringToken.pos;
714 int endPos = stringToken.endPos;
715 TokenKind kind = stringToken.kind;
716 String string = token.stringVal();
717 List<String> fragments = List.of(string);
718 List<JCExpression> expressions = List.nil();
719 nextToken();
720 if (kind != STRINGLITERAL) {
721 while (token.kind == STRINGFRAGMENT) {
722 stringToken = token;
723 endPos = stringToken.endPos;
724 string = stringToken.stringVal();
725 fragments = fragments.append(string);
726 nextToken();
727 }
728 while (token.pos < endPos && token.kind != DEFAULT && token.kind != ERROR) {
729 accept(LBRACE);
730 JCExpression expression = token.kind == RBRACE ? F.at(pos).Literal(TypeTag.BOT, null)
731 : term(EXPR);
732 expressions = expressions.append(expression);
733 if (token.kind != ERROR) {
734 accept(RBRACE);
735 }
736 }
737 // clean up remaining expression tokens if error
738 while (token.pos < endPos && token.kind != DEFAULT) {
739 nextToken();
740 }
741 S.setPrevToken(stringToken);
742 }
743 JCExpression t = toP(F.at(pos).StringTemplate(processor, fragments, expressions));
744 setMode(oldmode);
745 return t;
746 }
747
748 JCExpression literal(Name prefix) {
749 return literal(prefix, token.pos);
750 }
751
752 /**
753 * Literal =
754 * INTLITERAL
755 * | LONGLITERAL
756 * | FLOATLITERAL
757 * | DOUBLELITERAL
758 * | CHARLITERAL
759 * | STRINGLITERAL
760 * | TRUE
761 * | FALSE
762 * | NULL
763 */
764 JCExpression literal(Name prefix, int pos) {
765 JCExpression t = errorTree;
766 switch (token.kind) {
767 case INTLITERAL:
768 try {
769 t = F.at(pos).Literal(
770 TypeTag.INT,
771 Convert.string2int(strval(prefix), token.radix()));
772 } catch (NumberFormatException ex) {
773 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.IntNumberTooLarge(strval(prefix)));
774 }
775 break;
776 case LONGLITERAL:
777 try {
778 t = F.at(pos).Literal(
779 TypeTag.LONG,
780 Long.valueOf(Convert.string2long(strval(prefix), token.radix())));
781 } catch (NumberFormatException ex) {
782 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.IntNumberTooLarge(strval(prefix)));
783 }
784 break;
785 case FLOATLITERAL: {
786 String proper = token.radix() == 16 ?
787 ("0x"+ token.stringVal()) :
788 token.stringVal();
789 Float n;
790 try {
791 n = Float.valueOf(proper);
792 } catch (NumberFormatException ex) {
793 // error already reported in scanner
794 n = Float.NaN;
795 }
796 if (n.floatValue() == 0.0f && !isZero(proper))
797 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooSmall);
798 else if (n.floatValue() == Float.POSITIVE_INFINITY)
799 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooLarge);
800 else
801 t = F.at(pos).Literal(TypeTag.FLOAT, n);
802 break;
803 }
804 case DOUBLELITERAL: {
805 String proper = token.radix() == 16 ?
806 ("0x"+ token.stringVal()) :
807 token.stringVal();
808 Double n;
809 try {
810 n = Double.valueOf(proper);
811 } catch (NumberFormatException ex) {
812 // error already reported in scanner
813 n = Double.NaN;
814 }
815 if (n.doubleValue() == 0.0d && !isZero(proper))
816 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooSmall);
817 else if (n.doubleValue() == Double.POSITIVE_INFINITY)
818 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooLarge);
819 else
820 t = F.at(pos).Literal(TypeTag.DOUBLE, n);
821 break;
822 }
823 case CHARLITERAL:
824 t = F.at(pos).Literal(
825 TypeTag.CHAR,
826 token.stringVal().charAt(0) + 0);
827 break;
828 case STRINGLITERAL:
829 t = F.at(pos).Literal(
830 TypeTag.CLASS,
831 token.stringVal());
832 break;
833 case TRUE: case FALSE:
834 t = F.at(pos).Literal(
835 TypeTag.BOOLEAN,
836 (token.kind == TRUE ? 1 : 0));
837 break;
838 case NULL:
839 t = F.at(pos).Literal(
840 TypeTag.BOT,
841 null);
842 break;
843 default:
844 Assert.error();
845 }
846 if (t == errorTree)
847 t = F.at(pos).Erroneous();
848 storeEnd(t, token.endPos);
849 nextToken();
850 return t;
851 }
852 //where
853 boolean isZero(String s) {
854 char[] cs = s.toCharArray();
855 int base = ((cs.length > 1 && Character.toLowerCase(cs[1]) == 'x') ? 16 : 10);
856 int i = ((base==16) ? 2 : 0);
857 while (i < cs.length && (cs[i] == '0' || cs[i] == '.')) i++;
858 return !(i < cs.length && (Character.digit(cs[i], base) > 0));
859 }
860
861 String strval(Name prefix) {
862 String s = token.stringVal();
863 return prefix.isEmpty() ? s : prefix + s;
864 }
865
866 /** terms can be either expressions or types.
867 */
868 public JCExpression parseExpression() {
869 return term(EXPR);
870 }
871
872 /** parses patterns.
873 */
874 public JCPattern parsePattern(int pos, JCModifiers mods, JCExpression parsedType,
875 boolean allowVar, boolean checkGuard) {
876 JCPattern pattern;
877 mods = mods != null ? mods : optFinal(0);
878 JCExpression e;
879 if (token.kind == UNDERSCORE && parsedType == null) {
880 nextToken();
881 checkSourceLevel(Feature.UNNAMED_VARIABLES);
882 pattern = toP(F.at(token.pos).AnyPattern());
883 }
884 else {
885 if (parsedType == null) {
886 boolean var = token.kind == IDENTIFIER && token.name() == names.var;
887 e = unannotatedType(allowVar, TYPE | NOLAMBDA);
888 if (var) {
889 e = null;
890 }
891 } else {
892 e = parsedType;
893 }
894 if (token.kind == LPAREN) {
895 //deconstruction pattern:
896 checkSourceLevel(Feature.RECORD_PATTERNS);
897 ListBuffer<JCPattern> nested = new ListBuffer<>();
898 if (!peekToken(RPAREN)) {
899 do {
900 nextToken();
901 JCPattern nestedPattern = parsePattern(token.pos, null, null, true, false);
902 nested.append(nestedPattern);
903 } while (token.kind == COMMA);
904 } else {
905 nextToken();
906 }
907 accept(RPAREN);
908 pattern = toP(F.at(pos).RecordPattern(e, nested.toList()));
909 if (mods.annotations.nonEmpty()) {
910 log.error(mods.annotations.head.pos(), Errors.RecordPatternsAnnotationsNotAllowed);
911 }
912 checkNoMods(pos, mods.flags & Flags.FINAL);
913 new TreeScanner() {
914 @Override
915 public void visitAnnotatedType(JCAnnotatedType tree) {
916 log.error(tree.pos(), Errors.RecordPatternsAnnotationsNotAllowed);
917 }
918 }.scan(e);
919 } else {
920 //type test pattern:
921 int varPos = token.pos;
922 Name name = identOrUnderscore();
923 if (Feature.UNNAMED_VARIABLES.allowedInSource(source) && name == names.underscore) {
924 name = names.empty;
925 }
926 JCVariableDecl var = toP(F.at(varPos).VarDef(mods, name, e, null));
927 if (e == null) {
928 var.startPos = pos;
929 if (var.name == names.underscore && !allowVar) {
930 log.error(DiagnosticFlag.SYNTAX, varPos, Errors.UseOfUnderscoreNotAllowed);
931 }
932 }
933 pattern = toP(F.at(pos).BindingPattern(var));
934 }
935 }
936 return pattern;
937 }
938
939 /**
940 * parses (optional) type annotations followed by a type. If the
941 * annotations are present before the type and are not consumed during array
942 * parsing, this method returns a {@link JCAnnotatedType} consisting of
943 * these annotations and the underlying type. Otherwise, it returns the
944 * underlying type.
945 *
946 * <p>
947 *
948 * Note that this method sets {@code mode} to {@code TYPE} first, before
949 * parsing annotations.
950 */
951 public JCExpression parseType() {
952 return parseType(false);
953 }
954
955 public JCExpression parseType(boolean allowVar) {
956 List<JCAnnotation> annotations = typeAnnotationsOpt();
957 return parseType(allowVar, annotations);
958 }
959
960 public JCExpression parseType(boolean allowVar, List<JCAnnotation> annotations) {
961 JCExpression result = unannotatedType(allowVar);
962
963 if (annotations.nonEmpty()) {
964 result = insertAnnotationsToMostInner(result, annotations, false);
965 }
966
967 return result;
968 }
969
970 public JCExpression unannotatedType(boolean allowVar) {
971 return unannotatedType(allowVar, TYPE);
972 }
973
974 public JCExpression unannotatedType(boolean allowVar, int newmode) {
975 JCExpression result = term(newmode);
976 Name restrictedTypeName = restrictedTypeName(result, !allowVar);
977
978 if (restrictedTypeName != null && (!allowVar || restrictedTypeName != names.var)) {
979 syntaxError(result.pos, Errors.RestrictedTypeNotAllowedHere(restrictedTypeName));
980 }
981
982 return result;
983 }
984
985
986
987 protected JCExpression term(int newmode) {
988 int prevmode = mode;
989 setMode(newmode);
990 JCExpression t = term();
991 setLastMode(mode);
992 setMode(prevmode);
993 return t;
994 }
995
996 /**
997 * {@literal
998 * Expression = Expression1 [ExpressionRest]
999 * ExpressionRest = [AssignmentOperator Expression1]
1000 * AssignmentOperator = "=" | "+=" | "-=" | "*=" | "/=" |
1001 * "&=" | "|=" | "^=" |
1002 * "%=" | "<<=" | ">>=" | ">>>="
1003 * Type = Type1
1004 * TypeNoParams = TypeNoParams1
1005 * StatementExpression = Expression
1006 * ConstantExpression = Expression
1007 * }
1008 */
1009 JCExpression term() {
1010 JCExpression t = term1();
1011 if (isMode(EXPR) &&
1012 (token.kind == EQ || PLUSEQ.compareTo(token.kind) <= 0 && token.kind.compareTo(GTGTGTEQ) <= 0))
1013 return termRest(t);
1014 else
1015 return t;
1016 }
1017
1018 JCExpression termRest(JCExpression t) {
1019 switch (token.kind) {
1020 case EQ: {
1021 int pos = token.pos;
1022 nextToken();
1023 selectExprMode();
1024 JCExpression t1 = term();
1025 return toP(F.at(pos).Assign(t, t1));
1026 }
1027 case PLUSEQ:
1028 case SUBEQ:
1029 case STAREQ:
1030 case SLASHEQ:
1031 case PERCENTEQ:
1032 case AMPEQ:
1033 case BAREQ:
1034 case CARETEQ:
1035 case LTLTEQ:
1036 case GTGTEQ:
1037 case GTGTGTEQ:
1038 int pos = token.pos;
1039 TokenKind tk = token.kind;
1040 nextToken();
1041 selectExprMode();
1042 JCExpression t1 = term();
1043 return F.at(pos).Assignop(optag(tk), t, t1);
1044 default:
1045 return t;
1046 }
1047 }
1048
1049 /** Expression1 = Expression2 [Expression1Rest]
1050 * Type1 = Type2
1051 * TypeNoParams1 = TypeNoParams2
1052 */
1053 JCExpression term1() {
1054 JCExpression t = term2();
1055 if (isMode(EXPR) && token.kind == QUES) {
1056 selectExprMode();
1057 return term1Rest(t);
1058 } else {
1059 return t;
1060 }
1061 }
1062
1063 /** Expression1Rest = ["?" Expression ":" Expression1]
1064 */
1065 JCExpression term1Rest(JCExpression t) {
1066 if (token.kind == QUES) {
1067 int pos = token.pos;
1068 nextToken();
1069 JCExpression t1 = term();
1070 accept(COLON);
1071 JCExpression t2 = term1();
1072 return F.at(pos).Conditional(t, t1, t2);
1073 } else {
1074 return t;
1075 }
1076 }
1077
1078 /** Expression2 = Expression3 [Expression2Rest]
1079 * Type2 = Type3
1080 * TypeNoParams2 = TypeNoParams3
1081 */
1082 JCExpression term2() {
1083 JCExpression t = term3();
1084 if (isMode(EXPR) && prec(token.kind) >= TreeInfo.orPrec) {
1085 selectExprMode();
1086 return term2Rest(t, TreeInfo.orPrec);
1087 } else {
1088 return t;
1089 }
1090 }
1091
1092 /* Expression2Rest = {infixop Expression3}
1093 * | Expression3 instanceof Type
1094 * | Expression3 instanceof Pattern
1095 * infixop = "||"
1096 * | "&&"
1097 * | "|"
1098 * | "^"
1099 * | "&"
1100 * | "==" | "!="
1101 * | "<" | ">" | "<=" | ">="
1102 * | "<<" | ">>" | ">>>"
1103 * | "+" | "-"
1104 * | "*" | "/" | "%"
1105 */
1106 JCExpression term2Rest(JCExpression t, int minprec) {
1107 JCExpression[] odStack = newOdStack();
1108 Token[] opStack = newOpStack();
1109
1110 // optimization, was odStack = new Tree[...]; opStack = new Tree[...];
1111 int top = 0;
1112 odStack[0] = t;
1113 int startPos = token.pos;
1114 Token topOp = Tokens.DUMMY;
1115 while (prec(token.kind) >= minprec) {
1116 opStack[top] = topOp;
1117
1118 if (token.kind == INSTANCEOF) {
1119 int pos = token.pos;
1120 nextToken();
1121 JCTree pattern;
1122 if (token.kind == LPAREN) {
1123 checkSourceLevel(token.pos, Feature.PATTERN_SWITCH);
1124 pattern = parsePattern(token.pos, null, null, false, false);
1125 } else {
1126 int patternPos = token.pos;
1127 JCModifiers mods = optFinal(0);
1128 int typePos = token.pos;
1129 JCExpression type = unannotatedType(false);
1130 if (token.kind == IDENTIFIER) {
1131 checkSourceLevel(token.pos, Feature.PATTERN_MATCHING_IN_INSTANCEOF);
1132 pattern = parsePattern(patternPos, mods, type, false, false);
1133 } else if (token.kind == LPAREN) {
1134 pattern = parsePattern(patternPos, mods, type, false, false);
1135 } else if (token.kind == UNDERSCORE) {
1136 checkSourceLevel(token.pos, Feature.UNNAMED_VARIABLES);
1137 pattern = parsePattern(patternPos, mods, type, false, false);
1138 } else {
1139 checkNoMods(typePos, mods.flags & ~Flags.DEPRECATED);
1140 if (mods.annotations.nonEmpty()) {
1141 List<JCAnnotation> typeAnnos =
1142 mods.annotations
1143 .map(decl -> {
1144 JCAnnotation typeAnno = F.at(decl.pos)
1145 .TypeAnnotation(decl.annotationType,
1146 decl.args);
1147 endPosTable.replaceTree(decl, typeAnno);
1148 return typeAnno;
1149 });
1150 type = insertAnnotationsToMostInner(type, typeAnnos, false);
1151 }
1152 pattern = type;
1153 }
1154 }
1155 odStack[top] = F.at(pos).TypeTest(odStack[top], pattern);
1156 } else {
1157 topOp = token;
1158 nextToken();
1159 top++;
1160 odStack[top] = term3();
1161 }
1162 while (top > 0 && prec(topOp.kind) >= prec(token.kind)) {
1163 odStack[top - 1] = F.at(topOp.pos).Binary(optag(topOp.kind), odStack[top - 1], odStack[top]);
1164 top--;
1165 topOp = opStack[top];
1166 }
1167 }
1168 Assert.check(top == 0);
1169 t = odStack[0];
1170
1171 if (t.hasTag(JCTree.Tag.PLUS)) {
1172 t = foldStrings(t);
1173 }
1174
1175 odStackSupply.add(odStack);
1176 opStackSupply.add(opStack);
1177 return t;
1178 }
1179 //where
1180 /** If tree is a concatenation of string literals, replace it
1181 * by a single literal representing the concatenated string.
1182 */
1183 protected JCExpression foldStrings(JCExpression tree) {
1184 if (!allowStringFolding)
1185 return tree;
1186 ListBuffer<JCExpression> opStack = new ListBuffer<>();
1187 ListBuffer<JCLiteral> litBuf = new ListBuffer<>();
1188 boolean needsFolding = false;
1189 JCExpression curr = tree;
1190 while (true) {
1191 if (curr.hasTag(JCTree.Tag.PLUS)) {
1192 JCBinary op = (JCBinary)curr;
1193 needsFolding |= foldIfNeeded(op.rhs, litBuf, opStack, false);
1194 curr = op.lhs;
1195 } else {
1196 needsFolding |= foldIfNeeded(curr, litBuf, opStack, true);
1197 break; //last one!
1198 }
1199 }
1200 if (needsFolding) {
1201 List<JCExpression> ops = opStack.toList();
1202 JCExpression res = ops.head;
1203 for (JCExpression op : ops.tail) {
1204 res = F.at(op.getStartPosition()).Binary(optag(TokenKind.PLUS), res, op);
1205 storeEnd(res, getEndPos(op));
1206 }
1207 return res;
1208 } else {
1209 return tree;
1210 }
1211 }
1212
1213 private boolean foldIfNeeded(JCExpression tree, ListBuffer<JCLiteral> litBuf,
1214 ListBuffer<JCExpression> opStack, boolean last) {
1215 JCLiteral str = stringLiteral(tree);
1216 if (str != null) {
1217 litBuf.prepend(str);
1218 return last && merge(litBuf, opStack);
1219 } else {
1220 boolean res = merge(litBuf, opStack);
1221 litBuf.clear();
1222 opStack.prepend(tree);
1223 return res;
1224 }
1225 }
1226
1227 boolean merge(ListBuffer<JCLiteral> litBuf, ListBuffer<JCExpression> opStack) {
1228 if (litBuf.isEmpty()) {
1229 return false;
1230 } else if (litBuf.size() == 1) {
1231 opStack.prepend(litBuf.first());
1232 return false;
1233 } else {
1234 JCExpression t = F.at(litBuf.first().getStartPosition()).Literal(TypeTag.CLASS,
1235 litBuf.stream().map(lit -> (String)lit.getValue()).collect(Collectors.joining()));
1236 storeEnd(t, litBuf.last().getEndPosition(endPosTable));
1237 opStack.prepend(t);
1238 return true;
1239 }
1240 }
1241
1242 private JCLiteral stringLiteral(JCTree tree) {
1243 if (tree.hasTag(LITERAL)) {
1244 JCLiteral lit = (JCLiteral)tree;
1245 if (lit.typetag == TypeTag.CLASS) {
1246 return lit;
1247 }
1248 }
1249 return null;
1250 }
1251
1252
1253 /** optimization: To save allocating a new operand/operator stack
1254 * for every binary operation, we use supplys.
1255 */
1256 ArrayList<JCExpression[]> odStackSupply = new ArrayList<>();
1257 ArrayList<Token[]> opStackSupply = new ArrayList<>();
1258
1259 private JCExpression[] newOdStack() {
1260 if (odStackSupply.isEmpty())
1261 return new JCExpression[infixPrecedenceLevels + 1];
1262 return odStackSupply.remove(odStackSupply.size() - 1);
1263 }
1264
1265 private Token[] newOpStack() {
1266 if (opStackSupply.isEmpty())
1267 return new Token[infixPrecedenceLevels + 1];
1268 return opStackSupply.remove(opStackSupply.size() - 1);
1269 }
1270
1271 /**
1272 * Expression3 = PrefixOp Expression3
1273 * | "(" Expr | TypeNoParams ")" Expression3
1274 * | Primary {Selector} {PostfixOp}
1275 *
1276 * {@literal
1277 * Primary = "(" Expression ")"
1278 * | Literal
1279 * | [TypeArguments] THIS [Arguments]
1280 * | [TypeArguments] SUPER SuperSuffix
1281 * | NEW [TypeArguments] Creator
1282 * | "(" Arguments ")" "->" ( Expression | Block )
1283 * | Ident "->" ( Expression | Block )
1284 * | [Annotations] Ident { "." [Annotations] Ident }
1285 * | Expression3 MemberReferenceSuffix
1286 * [ [Annotations] "[" ( "]" BracketsOpt "." CLASS | Expression "]" )
1287 * | Arguments
1288 * | "." ( CLASS | THIS | [TypeArguments] SUPER Arguments | NEW [TypeArguments] InnerCreator )
1289 * ]
1290 * | BasicType BracketsOpt "." CLASS
1291 * }
1292 *
1293 * PrefixOp = "++" | "--" | "!" | "~" | "+" | "-"
1294 * PostfixOp = "++" | "--"
1295 * Type3 = Ident { "." Ident } [TypeArguments] {TypeSelector} BracketsOpt
1296 * | BasicType
1297 * TypeNoParams3 = Ident { "." Ident } BracketsOpt
1298 * Selector = "." [TypeArguments] Ident [Arguments]
1299 * | "." THIS
1300 * | "." [TypeArguments] SUPER SuperSuffix
1301 * | "." NEW [TypeArguments] InnerCreator
1302 * | "[" Expression "]"
1303 * TypeSelector = "." Ident [TypeArguments]
1304 * SuperSuffix = Arguments | "." Ident [Arguments]
1305 */
1306 protected JCExpression term3() {
1307 int pos = token.pos;
1308 JCExpression t;
1309 List<JCExpression> typeArgs = typeArgumentsOpt(EXPR);
1310 switch (token.kind) {
1311 case QUES:
1312 if (isMode(TYPE) && isMode(TYPEARG) && !isMode(NOPARAMS)) {
1313 selectTypeMode();
1314 return typeArgument();
1315 } else
1316 return illegal();
1317 case PLUSPLUS: case SUBSUB: case BANG: case TILDE: case PLUS: case SUB:
1318 if (typeArgs == null && isMode(EXPR)) {
1319 TokenKind tk = token.kind;
1320 nextToken();
1321 selectExprMode();
1322 if (tk == SUB &&
1323 (token.kind == INTLITERAL || token.kind == LONGLITERAL) &&
1324 token.radix() == 10) {
1325 selectExprMode();
1326 t = literal(names.hyphen, pos);
1327 } else {
1328 t = term3();
1329 return F.at(pos).Unary(unoptag(tk), t);
1330 }
1331 } else return illegal();
1332 break;
1333 case LPAREN:
1334 if (typeArgs == null && isMode(EXPR)) {
1335 ParensResult pres = analyzeParens();
1336 switch (pres) {
1337 case CAST:
1338 accept(LPAREN);
1339 selectTypeMode();
1340 int pos1 = pos;
1341 List<JCExpression> targets = List.of(t = parseType());
1342 while (token.kind == AMP) {
1343 accept(AMP);
1344 targets = targets.prepend(parseType());
1345 }
1346 if (targets.length() > 1) {
1347 t = toP(F.at(pos1).TypeIntersection(targets.reverse()));
1348 }
1349 accept(RPAREN);
1350 selectExprMode();
1351 JCExpression t1 = term3();
1352 return F.at(pos).TypeCast(t, t1);
1353 case IMPLICIT_LAMBDA:
1354 case EXPLICIT_LAMBDA:
1355 t = lambdaExpressionOrStatement(true, pres == ParensResult.EXPLICIT_LAMBDA, pos);
1356 break;
1357 default: //PARENS
1358 accept(LPAREN);
1359 selectExprMode();
1360 t = termRest(term1Rest(term2Rest(term3(), TreeInfo.orPrec)));
1361 accept(RPAREN);
1362 t = toP(F.at(pos).Parens(t));
1363 break;
1364 }
1365 } else {
1366 return illegal();
1367 }
1368 break;
1369 case THIS:
1370 if (isMode(EXPR)) {
1371 selectExprMode();
1372 t = to(F.at(pos).Ident(names._this));
1373 nextToken();
1374 if (typeArgs == null)
1375 t = argumentsOpt(null, t);
1376 else
1377 t = arguments(typeArgs, t);
1378 typeArgs = null;
1379 } else return illegal();
1380 break;
1381 case SUPER:
1382 if (isMode(EXPR)) {
1383 selectExprMode();
1384 t = to(F.at(pos).Ident(names._super));
1385 t = superSuffix(typeArgs, t);
1386 typeArgs = null;
1387 } else return illegal();
1388 break;
1389 case INTLITERAL: case LONGLITERAL: case FLOATLITERAL: case DOUBLELITERAL:
1390 case CHARLITERAL: case STRINGLITERAL:
1391 case TRUE: case FALSE: case NULL:
1392 if (typeArgs == null && isMode(EXPR)) {
1393 selectExprMode();
1394 t = literal(names.empty);
1395 } else return illegal();
1396 break;
1397 case STRINGFRAGMENT:
1398 if (typeArgs == null && isMode(EXPR)) {
1399 selectExprMode();
1400 t = stringTemplate(null);
1401 } else {
1402 return illegal();
1403 }
1404 break;
1405 case NEW:
1406 if (typeArgs != null) return illegal();
1407 if (isMode(EXPR)) {
1408 selectExprMode();
1409 nextToken();
1410 if (token.kind == LT) typeArgs = typeArguments(false);
1411 t = creator(pos, typeArgs);
1412 typeArgs = null;
1413 } else return illegal();
1414 break;
1415 case MONKEYS_AT:
1416 // Only annotated cast types and method references are valid
1417 List<JCAnnotation> typeAnnos = typeAnnotationsOpt();
1418 if (typeAnnos.isEmpty()) {
1419 // else there would be no '@'
1420 throw new AssertionError("Expected type annotations, but found none!");
1421 }
1422
1423 JCExpression expr = term3();
1424
1425 if (!isMode(TYPE)) {
1426 // Type annotations on class literals no longer legal
1427 switch (expr.getTag()) {
1428 case REFERENCE: {
1429 JCMemberReference mref = (JCMemberReference) expr;
1430 mref.expr = toP(F.at(pos).AnnotatedType(typeAnnos, mref.expr));
1431 t = mref;
1432 break;
1433 }
1434 case SELECT: {
1435 JCFieldAccess sel = (JCFieldAccess) expr;
1436
1437 if (sel.name != names._class) {
1438 return illegal();
1439 } else {
1440 log.error(token.pos, Errors.NoAnnotationsOnDotClass);
1441 return expr;
1442 }
1443 }
1444 default:
1445 return illegal(typeAnnos.head.pos);
1446 }
1447
1448 } else {
1449 // Type annotations targeting a cast
1450 t = insertAnnotationsToMostInner(expr, typeAnnos, false);
1451 }
1452 break;
1453 case UNDERSCORE: case IDENTIFIER: case ASSERT: case ENUM:
1454 if (typeArgs != null) return illegal();
1455 if (isMode(EXPR) && !isMode(NOLAMBDA) && peekToken(ARROW)) {
1456 t = lambdaExpressionOrStatement(false, false, pos);
1457 } else {
1458 t = toP(F.at(token.pos).Ident(ident()));
1459 loop: while (true) {
1460 pos = token.pos;
1461 final List<JCAnnotation> annos = typeAnnotationsOpt();
1462
1463 // need to report an error later if LBRACKET is for array
1464 // index access rather than array creation level
1465 if (!annos.isEmpty() && token.kind != LBRACKET && token.kind != ELLIPSIS)
1466 return illegal(annos.head.pos);
1467
1468 switch (token.kind) {
1469 case LBRACKET:
1470 nextToken();
1471 if (token.kind == RBRACKET) {
1472 nextToken();
1473 t = bracketsOpt(t);
1474 t = toP(F.at(pos).TypeArray(t));
1475 if (annos.nonEmpty()) {
1476 t = toP(F.at(pos).AnnotatedType(annos, t));
1477 }
1478 t = bracketsSuffix(t);
1479 } else {
1480 if (isMode(EXPR)) {
1481 selectExprMode();
1482 JCExpression t1 = term();
1483 if (!annos.isEmpty()) t = illegal(annos.head.pos);
1484 t = to(F.at(pos).Indexed(t, t1));
1485 }
1486 accept(RBRACKET);
1487 }
1488 break loop;
1489 case LPAREN:
1490 if (isMode(EXPR)) {
1491 selectExprMode();
1492 t = arguments(typeArgs, t);
1493 if (!annos.isEmpty()) t = illegal(annos.head.pos);
1494 typeArgs = null;
1495 }
1496 break loop;
1497 case DOT:
1498 nextToken();
1499 if (token.kind == TokenKind.IDENTIFIER && typeArgs != null) {
1500 return illegal();
1501 }
1502 int prevmode = mode;
1503 setMode(mode & ~NOPARAMS);
1504 typeArgs = typeArgumentsOpt(EXPR);
1505 setMode(prevmode);
1506 if (isMode(EXPR)) {
1507 switch (token.kind) {
1508 case CLASS:
1509 if (typeArgs != null) return illegal();
1510 selectExprMode();
1511 t = to(F.at(pos).Select(t, names._class));
1512 nextToken();
1513 break loop;
1514 case THIS:
1515 if (typeArgs != null) return illegal();
1516 selectExprMode();
1517 t = to(F.at(pos).Select(t, names._this));
1518 nextToken();
1519 break loop;
1520 case SUPER:
1521 selectExprMode();
1522 t = to(F.at(pos).Select(t, names._super));
1523 t = superSuffix(typeArgs, t);
1524 typeArgs = null;
1525 break loop;
1526 case NEW:
1527 if (typeArgs != null) return illegal();
1528 selectExprMode();
1529 int pos1 = token.pos;
1530 nextToken();
1531 if (token.kind == LT) typeArgs = typeArguments(false);
1532 t = innerCreator(pos1, typeArgs, t);
1533 typeArgs = null;
1534 break loop;
1535 case STRINGFRAGMENT:
1536 case STRINGLITERAL:
1537 if (typeArgs != null) return illegal();
1538 t = stringTemplate(t);
1539 typeArgs = null;
1540 break loop;
1541 }
1542 }
1543
1544 List<JCAnnotation> tyannos = null;
1545 if (isMode(TYPE) && token.kind == MONKEYS_AT) {
1546 tyannos = typeAnnotationsOpt();
1547 }
1548 // typeArgs saved for next loop iteration.
1549 t = toP(F.at(pos).Select(t, ident()));
1550 if (token.pos <= endPosTable.errorEndPos &&
1551 token.kind == MONKEYS_AT) {
1552 //error recovery, case like:
1553 //int i = expr.<missing-ident>
1554 //@Deprecated
1555 if (typeArgs != null) illegal();
1556 return toP(t);
1557 }
1558 if (tyannos != null && tyannos.nonEmpty()) {
1559 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1560 }
1561 break;
1562 case ELLIPSIS:
1563 if (this.permitTypeAnnotationsPushBack) {
1564 this.typeAnnotationsPushedBack = annos;
1565 } else if (annos.nonEmpty()) {
1566 // Don't return here -- error recovery attempt
1567 illegal(annos.head.pos);
1568 }
1569 break loop;
1570 case LT:
1571 if (!isMode(TYPE) && isUnboundMemberRef()) {
1572 //this is an unbound method reference whose qualifier
1573 //is a generic type i.e. A<S>::m
1574 int pos1 = token.pos;
1575 accept(LT);
1576 ListBuffer<JCExpression> args = new ListBuffer<>();
1577 args.append(typeArgument());
1578 while (token.kind == COMMA) {
1579 nextToken();
1580 args.append(typeArgument());
1581 }
1582 accept(GT);
1583 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1584 while (token.kind == DOT) {
1585 nextToken();
1586 selectTypeMode();
1587 t = toP(F.at(token.pos).Select(t, ident()));
1588 t = typeArgumentsOpt(t);
1589 }
1590 t = bracketsOpt(t);
1591 if (token.kind != COLCOL) {
1592 //method reference expected here
1593 t = illegal();
1594 }
1595 selectExprMode();
1596 return term3Rest(t, typeArgs);
1597 }
1598 break loop;
1599 default:
1600 break loop;
1601 }
1602 }
1603 }
1604 if (typeArgs != null) illegal();
1605 t = typeArgumentsOpt(t);
1606 break;
1607 case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
1608 case DOUBLE: case BOOLEAN:
1609 if (typeArgs != null) illegal();
1610 t = bracketsSuffix(bracketsOpt(basicType()));
1611 break;
1612 case VOID:
1613 if (typeArgs != null) illegal();
1614 if (isMode(EXPR)) {
1615 nextToken();
1616 if (token.kind == DOT) {
1617 JCPrimitiveTypeTree ti = toP(F.at(pos).TypeIdent(TypeTag.VOID));
1618 t = bracketsSuffix(ti);
1619 } else {
1620 return illegal(pos);
1621 }
1622 } else {
1623 // Support the corner case of myMethodHandle.<void>invoke() by passing
1624 // a void type (like other primitive types) to the next phase.
1625 // The error will be reported in Attr.attribTypes or Attr.visitApply.
1626 JCPrimitiveTypeTree ti = to(F.at(pos).TypeIdent(TypeTag.VOID));
1627 nextToken();
1628 return ti;
1629 //return illegal();
1630 }
1631 break;
1632 case SWITCH:
1633 checkSourceLevel(Feature.SWITCH_EXPRESSION);
1634 allowYieldStatement = true;
1635 int switchPos = token.pos;
1636 nextToken();
1637 JCExpression selector = parExpression();
1638 accept(LBRACE);
1639 ListBuffer<JCCase> cases = new ListBuffer<>();
1640 while (true) {
1641 pos = token.pos;
1642 switch (token.kind) {
1643 case CASE:
1644 case DEFAULT:
1645 cases.appendList(switchExpressionStatementGroup());
1646 break;
1647 case RBRACE: case EOF:
1648 JCSwitchExpression e = to(F.at(switchPos).SwitchExpression(selector,
1649 cases.toList()));
1650 e.endpos = token.pos;
1651 accept(RBRACE);
1652 return e;
1653 default:
1654 nextToken(); // to ensure progress
1655 syntaxError(pos, Errors.Expected3(CASE, DEFAULT, RBRACE));
1656 }
1657 }
1658 // Not reachable.
1659 default:
1660 return illegal();
1661 }
1662 return term3Rest(t, typeArgs);
1663 }
1664
1665 private List<JCCase> switchExpressionStatementGroup() {
1666 ListBuffer<JCCase> caseExprs = new ListBuffer<>();
1667 int casePos = token.pos;
1668 ListBuffer<JCCaseLabel> pats = new ListBuffer<>();
1669
1670 if (token.kind == DEFAULT) {
1671 nextToken();
1672 pats.append(toP(F.at(casePos).DefaultCaseLabel()));
1673 } else {
1674 accept(CASE);
1675 boolean allowDefault = false;
1676 while (true) {
1677 JCCaseLabel label = parseCaseLabel(allowDefault);
1678 pats.append(label);
1679 if (token.kind != COMMA) break;
1680 checkSourceLevel(Feature.SWITCH_MULTIPLE_CASE_LABELS);
1681 nextToken();
1682 allowDefault = TreeInfo.isNullCaseLabel(label);
1683 };
1684 }
1685 JCExpression guard = parseGuard(pats.last());
1686 List<JCStatement> stats = null;
1687 JCTree body = null;
1688 CaseTree.CaseKind kind;
1689 switch (token.kind) {
1690 case ARROW:
1691 checkSourceLevel(Feature.SWITCH_RULE);
1692 nextToken();
1693 if (token.kind == TokenKind.THROW || token.kind == TokenKind.LBRACE) {
1694 stats = List.of(parseStatement());
1695 body = stats.head;
1696 kind = JCCase.RULE;
1697 } else {
1698 JCExpression value = parseExpression();
1699 stats = List.of(to(F.at(value).Yield(value)));
1700 body = value;
1701 kind = JCCase.RULE;
1702 accept(SEMI);
1703 }
1704 break;
1705 default:
1706 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
1707 stats = blockStatements();
1708 kind = JCCase.STATEMENT;
1709 break;
1710 }
1711 caseExprs.append(toP(F.at(casePos).Case(kind, pats.toList(), guard, stats, body)));
1712 return caseExprs.toList();
1713 }
1714
1715 JCExpression term3Rest(JCExpression t, List<JCExpression> typeArgs) {
1716 if (typeArgs != null) illegal();
1717 while (true) {
1718 int pos1 = token.pos;
1719 final List<JCAnnotation> annos = typeAnnotationsOpt();
1720
1721 if (token.kind == LBRACKET) {
1722 nextToken();
1723 if (isMode(TYPE)) {
1724 int prevmode = mode;
1725 selectTypeMode();
1726 if (token.kind == RBRACKET) {
1727 nextToken();
1728 t = bracketsOpt(t);
1729 t = toP(F.at(pos1).TypeArray(t));
1730 if (token.kind == COLCOL) {
1731 selectExprMode();
1732 continue;
1733 }
1734 if (annos.nonEmpty()) {
1735 t = toP(F.at(pos1).AnnotatedType(annos, t));
1736 }
1737 return t;
1738 }
1739 setMode(prevmode);
1740 }
1741 if (isMode(EXPR)) {
1742 selectExprMode();
1743 JCExpression t1 = term();
1744 t = to(F.at(pos1).Indexed(t, t1));
1745 }
1746 accept(RBRACKET);
1747 } else if (token.kind == DOT) {
1748 nextToken();
1749 typeArgs = typeArgumentsOpt(EXPR);
1750 if (token.kind == SUPER && isMode(EXPR)) {
1751 selectExprMode();
1752 t = to(F.at(pos1).Select(t, names._super));
1753 nextToken();
1754 t = arguments(typeArgs, t);
1755 typeArgs = null;
1756 } else if (token.kind == NEW && isMode(EXPR)) {
1757 if (typeArgs != null) return illegal();
1758 selectExprMode();
1759 int pos2 = token.pos;
1760 nextToken();
1761 if (token.kind == LT) typeArgs = typeArguments(false);
1762 t = innerCreator(pos2, typeArgs, t);
1763 typeArgs = null;
1764 } else if (token.kind == TokenKind.STRINGFRAGMENT ||
1765 token.kind == TokenKind.STRINGLITERAL) {
1766 if (typeArgs != null) {
1767 return illegal();
1768 }
1769 t = stringTemplate(t);
1770 } else {
1771 List<JCAnnotation> tyannos = null;
1772 if (isMode(TYPE) && token.kind == MONKEYS_AT) {
1773 // is the mode check needed?
1774 tyannos = typeAnnotationsOpt();
1775 }
1776 t = toP(F.at(pos1).Select(t, ident(true)));
1777 if (token.pos <= endPosTable.errorEndPos &&
1778 token.kind == MONKEYS_AT) {
1779 //error recovery, case like:
1780 //int i = expr.<missing-ident>
1781 //@Deprecated
1782 break;
1783 }
1784 if (tyannos != null && tyannos.nonEmpty()) {
1785 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1786 }
1787 t = argumentsOpt(typeArgs, typeArgumentsOpt(t));
1788 typeArgs = null;
1789 }
1790 } else if (isMode(EXPR) && token.kind == COLCOL) {
1791 selectExprMode();
1792 if (typeArgs != null) return illegal();
1793 accept(COLCOL);
1794 t = memberReferenceSuffix(pos1, t);
1795 } else {
1796 if (!annos.isEmpty()) {
1797 if (permitTypeAnnotationsPushBack)
1798 typeAnnotationsPushedBack = annos;
1799 else
1800 return illegal(annos.head.pos);
1801 }
1802 break;
1803 }
1804 }
1805 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && isMode(EXPR)) {
1806 selectExprMode();
1807 t = to(F.at(token.pos).Unary(
1808 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1809 nextToken();
1810 }
1811 return toP(t);
1812 }
1813
1814 /**
1815 * If we see an identifier followed by a '<' it could be an unbound
1816 * method reference or a binary expression. To disambiguate, look for a
1817 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1818 */
1819 @SuppressWarnings("fallthrough")
1820 boolean isUnboundMemberRef() {
1821 int pos = 0, depth = 0;
1822 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1823 switch (t.kind) {
1824 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1825 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1826 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1827 case DOUBLE: case BOOLEAN: case CHAR:
1828 case MONKEYS_AT:
1829 break;
1830
1831 case LPAREN:
1832 // skip annotation values
1833 int nesting = 0;
1834 for (; ; pos++) {
1835 TokenKind tk2 = S.token(pos).kind;
1836 switch (tk2) {
1837 case EOF:
1838 return false;
1839 case LPAREN:
1840 nesting++;
1841 break;
1842 case RPAREN:
1843 nesting--;
1844 if (nesting == 0) {
1845 continue outer;
1846 }
1847 break;
1848 }
1849 }
1850
1851 case LT:
1852 depth++; break;
1853 case GTGTGT:
1854 depth--;
1855 case GTGT:
1856 depth--;
1857 case GT:
1858 depth--;
1859 if (depth == 0) {
1860 TokenKind nextKind = S.token(pos + 1).kind;
1861 return
1862 nextKind == TokenKind.DOT ||
1863 nextKind == TokenKind.LBRACKET ||
1864 nextKind == TokenKind.COLCOL;
1865 }
1866 break;
1867 default:
1868 return false;
1869 }
1870 }
1871 }
1872
1873 /**
1874 * If we see an identifier followed by a '<' it could be an unbound
1875 * method reference or a binary expression. To disambiguate, look for a
1876 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1877 */
1878 @SuppressWarnings("fallthrough")
1879 ParensResult analyzeParens() {
1880 int depth = 0;
1881 boolean type = false;
1882 ParensResult defaultResult = ParensResult.PARENS;
1883 outer: for (int lookahead = 0; ; lookahead++) {
1884 TokenKind tk = S.token(lookahead).kind;
1885 switch (tk) {
1886 case COMMA:
1887 type = true;
1888 case EXTENDS: case SUPER: case DOT: case AMP:
1889 //skip
1890 break;
1891 case QUES:
1892 if (peekToken(lookahead, EXTENDS) ||
1893 peekToken(lookahead, SUPER)) {
1894 //wildcards
1895 type = true;
1896 }
1897 break;
1898 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1899 case DOUBLE: case BOOLEAN: case CHAR: case VOID:
1900 if (peekToken(lookahead, RPAREN)) {
1901 //Type, ')' -> cast
1902 return ParensResult.CAST;
1903 } else if (peekToken(lookahead, LAX_IDENTIFIER)) {
1904 //Type, Identifier/'_'/'assert'/'enum' -> explicit lambda
1905 return ParensResult.EXPLICIT_LAMBDA;
1906 }
1907 break;
1908 case LPAREN:
1909 if (lookahead != 0) {
1910 // '(' in a non-starting position -> parens
1911 return ParensResult.PARENS;
1912 } else if (peekToken(lookahead, RPAREN)) {
1913 // '(', ')' -> explicit lambda
1914 return ParensResult.EXPLICIT_LAMBDA;
1915 }
1916 break;
1917 case RPAREN:
1918 // if we have seen something that looks like a type,
1919 // then it's a cast expression
1920 if (type) return ParensResult.CAST;
1921 // otherwise, disambiguate cast vs. parenthesized expression
1922 // based on subsequent token.
1923 switch (S.token(lookahead + 1).kind) {
1924 /*case PLUSPLUS: case SUBSUB: */
1925 case BANG: case TILDE:
1926 case LPAREN: case THIS: case SUPER:
1927 case INTLITERAL: case LONGLITERAL: case FLOATLITERAL:
1928 case DOUBLELITERAL: case CHARLITERAL: case STRINGLITERAL:
1929 case STRINGFRAGMENT:
1930 case TRUE: case FALSE: case NULL:
1931 case NEW: case IDENTIFIER: case ASSERT: case ENUM: case UNDERSCORE:
1932 case SWITCH:
1933 case BYTE: case SHORT: case CHAR: case INT:
1934 case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
1935 return ParensResult.CAST;
1936 default:
1937 return defaultResult;
1938 }
1939 case UNDERSCORE:
1940 case ASSERT:
1941 case ENUM:
1942 case IDENTIFIER:
1943 if (peekToken(lookahead, LAX_IDENTIFIER)) {
1944 // Identifier, Identifier/'_'/'assert'/'enum' -> explicit lambda
1945 return ParensResult.EXPLICIT_LAMBDA;
1946 } else if (peekToken(lookahead, RPAREN, ARROW)) {
1947 // Identifier, ')' '->' -> implicit lambda
1948 return !isMode(NOLAMBDA) ? ParensResult.IMPLICIT_LAMBDA
1949 : ParensResult.PARENS;
1950 } else if (depth == 0 && peekToken(lookahead, COMMA)) {
1951 defaultResult = ParensResult.IMPLICIT_LAMBDA;
1952 }
1953 type = false;
1954 break;
1955 case FINAL:
1956 case ELLIPSIS:
1957 //those can only appear in explicit lambdas
1958 return ParensResult.EXPLICIT_LAMBDA;
1959 case MONKEYS_AT:
1960 type = true;
1961 lookahead = skipAnnotation(lookahead);
1962 break;
1963 case LBRACKET:
1964 if (peekToken(lookahead, RBRACKET, LAX_IDENTIFIER)) {
1965 // '[', ']', Identifier/'_'/'assert'/'enum' -> explicit lambda
1966 return ParensResult.EXPLICIT_LAMBDA;
1967 } else if (peekToken(lookahead, RBRACKET, RPAREN) ||
1968 peekToken(lookahead, RBRACKET, AMP)) {
1969 // '[', ']', ')' -> cast
1970 // '[', ']', '&' -> cast (intersection type)
1971 return ParensResult.CAST;
1972 } else if (peekToken(lookahead, RBRACKET)) {
1973 //consume the ']' and skip
1974 type = true;
1975 lookahead++;
1976 break;
1977 } else {
1978 return ParensResult.PARENS;
1979 }
1980 case LT:
1981 depth++; break;
1982 case GTGTGT:
1983 depth--;
1984 case GTGT:
1985 depth--;
1986 case GT:
1987 depth--;
1988 if (depth == 0) {
1989 if (peekToken(lookahead, RPAREN) ||
1990 peekToken(lookahead, AMP)) {
1991 // '>', ')' -> cast
1992 // '>', '&' -> cast
1993 return ParensResult.CAST;
1994 } else if (peekToken(lookahead, LAX_IDENTIFIER, COMMA) ||
1995 peekToken(lookahead, LAX_IDENTIFIER, RPAREN, ARROW) ||
1996 peekToken(lookahead, ELLIPSIS)) {
1997 // '>', Identifier/'_'/'assert'/'enum', ',' -> explicit lambda
1998 // '>', Identifier/'_'/'assert'/'enum', ')', '->' -> explicit lambda
1999 // '>', '...' -> explicit lambda
2000 return ParensResult.EXPLICIT_LAMBDA;
2001 }
2002 //it looks a type, but could still be (i) a cast to generic type,
2003 //(ii) an unbound method reference or (iii) an explicit lambda
2004 type = true;
2005 break;
2006 } else if (depth < 0) {
2007 //unbalanced '<', '>' - not a generic type
2008 return ParensResult.PARENS;
2009 }
2010 break;
2011 default:
2012 //this includes EOF
2013 return defaultResult;
2014 }
2015 }
2016 }
2017
2018 private int skipAnnotation(int lookahead) {
2019 lookahead += 1; //skip '@'
2020 while (peekToken(lookahead, DOT)) {
2021 lookahead += 2;
2022 }
2023 if (peekToken(lookahead, LPAREN)) {
2024 lookahead++;
2025 //skip annotation values
2026 int nesting = 0;
2027 for (; ; lookahead++) {
2028 TokenKind tk2 = S.token(lookahead).kind;
2029 switch (tk2) {
2030 case EOF:
2031 return lookahead;
2032 case LPAREN:
2033 nesting++;
2034 break;
2035 case RPAREN:
2036 nesting--;
2037 if (nesting == 0) {
2038 return lookahead;
2039 }
2040 break;
2041 }
2042 }
2043 }
2044 return lookahead;
2045 }
2046
2047 /** Accepts all identifier-like tokens */
2048 protected Predicate<TokenKind> LAX_IDENTIFIER = t -> t == IDENTIFIER || t == UNDERSCORE || t == ASSERT || t == ENUM;
2049
2050 enum ParensResult {
2051 CAST,
2052 EXPLICIT_LAMBDA,
2053 IMPLICIT_LAMBDA,
2054 PARENS
2055 }
2056
2057 JCExpression lambdaExpressionOrStatement(boolean hasParens, boolean explicitParams, int pos) {
2058 List<JCVariableDecl> params = explicitParams ?
2059 formalParameters(true, false) :
2060 implicitParameters(hasParens);
2061 if (explicitParams) {
2062 LambdaClassifier lambdaClassifier = new LambdaClassifier();
2063 for (JCVariableDecl param: params) {
2064 Name restrictedTypeName;
2065 if (param.vartype != null &&
2066 (restrictedTypeName = restrictedTypeName(param.vartype, false)) != null &&
2067 param.vartype.hasTag(TYPEARRAY)) {
2068 log.error(DiagnosticFlag.SYNTAX, param.pos,
2069 Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS.allowedInSource(source)
2070 ? Errors.RestrictedTypeNotAllowedArray(restrictedTypeName) : Errors.RestrictedTypeNotAllowedHere(restrictedTypeName));
2071 }
2072 lambdaClassifier.addParameter(param);
2073 if (lambdaClassifier.result() == LambdaParameterKind.ERROR) {
2074 break;
2075 }
2076 }
2077 if (lambdaClassifier.diagFragment != null) {
2078 log.error(DiagnosticFlag.SYNTAX, pos, Errors.InvalidLambdaParameterDeclaration(lambdaClassifier.diagFragment));
2079 }
2080 for (JCVariableDecl param: params) {
2081 if (param.vartype != null
2082 && restrictedTypeName(param.vartype, true) != null) {
2083 checkSourceLevel(param.pos, Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS);
2084 param.startPos = TreeInfo.getStartPos(param.vartype);
2085 param.vartype = null;
2086 }
2087 }
2088 }
2089 return lambdaExpressionOrStatementRest(params, pos);
2090 }
2091
2092 enum LambdaParameterKind {
2093 VAR(0),
2094 EXPLICIT(1),
2095 IMPLICIT(2),
2096 ERROR(-1);
2097
2098 private final int index;
2099
2100 LambdaParameterKind(int index) {
2101 this.index = index;
2102 }
2103 }
2104
2105 private static final Fragment[][] decisionTable = new Fragment[][] {
2106 /* VAR EXPLICIT IMPLICIT */
2107 /* VAR */ {null, VarAndExplicitNotAllowed, VarAndImplicitNotAllowed},
2108 /* EXPLICIT */ {VarAndExplicitNotAllowed, null, ImplicitAndExplicitNotAllowed},
2109 /* IMPLICIT */ {VarAndImplicitNotAllowed, ImplicitAndExplicitNotAllowed, null},
2110 };
2111
2112 class LambdaClassifier {
2113 LambdaParameterKind kind;
2114 Fragment diagFragment;
2115
2116 /**
2117 * analyzeParens() has already classified the lambda as EXPLICIT_LAMBDA, due to
2118 * two consecutive identifiers. Because of that {@code (<explicit lambda>)}, the
2119 * parser will always attempt to parse a type, followed by a name. If the lambda
2120 * contains an illegal mix of implicit and explicit parameters, it is possible
2121 * for the parser to see a {@code ,} when expecting a name, in which case the
2122 * variable is created with an erroneous name. The logic below makes sure that
2123 * the lambda parameters are all declared with either an explicit type (e.g.
2124 * {@code String x}), or with an inferred type (using {@code var x}). Any other
2125 * combination is rejected.
2126 * */
2127 void addParameter(JCVariableDecl param) {
2128 Assert.check(param.vartype != null);
2129
2130 if (param.name == names.error) {
2131 reduce(LambdaParameterKind.IMPLICIT);
2132 }
2133 else if (restrictedTypeName(param.vartype, false) != null) {
2134 reduce(LambdaParameterKind.VAR);
2135 } else {
2136 reduce(LambdaParameterKind.EXPLICIT);
2137 }
2138 }
2139
2140 private void reduce(LambdaParameterKind newKind) {
2141 if (kind == null) {
2142 kind = newKind;
2143 } else if (kind != newKind && kind != LambdaParameterKind.ERROR) {
2144 LambdaParameterKind currentKind = kind;
2145 kind = LambdaParameterKind.ERROR;
2146 boolean varIndex = currentKind.index == LambdaParameterKind.VAR.index ||
2147 newKind.index == LambdaParameterKind.VAR.index;
2148 diagFragment = Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS.allowedInSource(source) || !varIndex ?
2149 decisionTable[currentKind.index][newKind.index] : null;
2150 }
2151 }
2152
2153 LambdaParameterKind result() {
2154 return kind;
2155 }
2156 }
2157
2158 JCExpression lambdaExpressionOrStatementRest(List<JCVariableDecl> args, int pos) {
2159 accept(ARROW);
2160
2161 return token.kind == LBRACE ?
2162 lambdaStatement(args, pos, token.pos) :
2163 lambdaExpression(args, pos);
2164 }
2165
2166 JCExpression lambdaStatement(List<JCVariableDecl> args, int pos, int pos2) {
2167 JCBlock block = block(pos2, 0);
2168 return toP(F.at(pos).Lambda(args, block));
2169 }
2170
2171 JCExpression lambdaExpression(List<JCVariableDecl> args, int pos) {
2172 JCTree expr = parseExpression();
2173 return toP(F.at(pos).Lambda(args, expr));
2174 }
2175
2176 /** SuperSuffix = Arguments | "." [TypeArguments] Ident [Arguments]
2177 */
2178 JCExpression superSuffix(List<JCExpression> typeArgs, JCExpression t) {
2179 nextToken();
2180 if (token.kind == LPAREN || typeArgs != null) {
2181 t = arguments(typeArgs, t);
2182 } else if (token.kind == COLCOL) {
2183 if (typeArgs != null) return illegal();
2184 t = memberReferenceSuffix(t);
2185 } else {
2186 int pos = token.pos;
2187 accept(DOT);
2188 typeArgs = (token.kind == LT) ? typeArguments(false) : null;
2189 t = toP(F.at(pos).Select(t, ident()));
2190 t = argumentsOpt(typeArgs, t);
2191 }
2192 return t;
2193 }
2194
2195 /** BasicType = BYTE | SHORT | CHAR | INT | LONG | FLOAT | DOUBLE | BOOLEAN
2196 */
2197 JCPrimitiveTypeTree basicType() {
2198 JCPrimitiveTypeTree t = to(F.at(token.pos).TypeIdent(typetag(token.kind)));
2199 nextToken();
2200 return t;
2201 }
2202
2203 /** ArgumentsOpt = [ Arguments ]
2204 */
2205 JCExpression argumentsOpt(List<JCExpression> typeArgs, JCExpression t) {
2206 if (isMode(EXPR) && token.kind == LPAREN || typeArgs != null) {
2207 selectExprMode();
2208 return arguments(typeArgs, t);
2209 } else {
2210 return t;
2211 }
2212 }
2213
2214 /** Arguments = "(" [Expression { COMMA Expression }] ")"
2215 */
2216 List<JCExpression> arguments() {
2217 ListBuffer<JCExpression> args = new ListBuffer<>();
2218 if (token.kind == LPAREN) {
2219 nextToken();
2220 if (token.kind != RPAREN) {
2221 args.append(parseExpression());
2222 while (token.kind == COMMA) {
2223 nextToken();
2224 args.append(parseExpression());
2225 }
2226 }
2227 accept(RPAREN, tk -> Errors.Expected2(RPAREN, COMMA));
2228 } else {
2229 syntaxError(token.pos, Errors.Expected(LPAREN));
2230 }
2231 return args.toList();
2232 }
2233
2234 JCExpression arguments(List<JCExpression> typeArgs, JCExpression t) {
2235 int pos = token.pos;
2236 List<JCExpression> args = arguments();
2237 JCExpression mi = F.at(pos).Apply(typeArgs, t, args);
2238 if (t.hasTag(IDENT) && isInvalidUnqualifiedMethodIdentifier(((JCIdent) t).pos,
2239 ((JCIdent) t).name)) {
2240 log.error(DiagnosticFlag.SYNTAX, t, Errors.InvalidYield);
2241 mi = F.Erroneous(List.of(mi));
2242 }
2243 return toP(mi);
2244 }
2245
2246 boolean isInvalidUnqualifiedMethodIdentifier(int pos, Name name) {
2247 if (name == names.yield) {
2248 if (allowYieldStatement) {
2249 return true;
2250 } else {
2251 log.warning(pos, Warnings.InvalidYield);
2252 }
2253 }
2254 return false;
2255 }
2256
2257 /** TypeArgumentsOpt = [ TypeArguments ]
2258 */
2259 JCExpression typeArgumentsOpt(JCExpression t) {
2260 if (token.kind == LT &&
2261 isMode(TYPE) &&
2262 !isMode(NOPARAMS)) {
2263 selectTypeMode();
2264 return typeArguments(t, false);
2265 } else {
2266 return t;
2267 }
2268 }
2269 List<JCExpression> typeArgumentsOpt() {
2270 return typeArgumentsOpt(TYPE);
2271 }
2272
2273 List<JCExpression> typeArgumentsOpt(int useMode) {
2274 if (token.kind == LT) {
2275 if (!isMode(useMode) ||
2276 isMode(NOPARAMS)) {
2277 illegal();
2278 }
2279 setMode(useMode);
2280 return typeArguments(false);
2281 }
2282 return null;
2283 }
2284
2285 /**
2286 * {@literal
2287 * TypeArguments = "<" TypeArgument {"," TypeArgument} ">"
2288 * }
2289 */
2290 List<JCExpression> typeArguments(boolean diamondAllowed) {
2291 if (token.kind == LT) {
2292 nextToken();
2293 if (token.kind == GT && diamondAllowed) {
2294 setMode(mode | DIAMOND);
2295 nextToken();
2296 return List.nil();
2297 } else {
2298 ListBuffer<JCExpression> args = new ListBuffer<>();
2299 args.append(!isMode(EXPR) ? typeArgument() : parseType());
2300 while (token.kind == COMMA) {
2301 nextToken();
2302 args.append(!isMode(EXPR) ? typeArgument() : parseType());
2303 }
2304 switch (token.kind) {
2305
2306 case GTGTGTEQ: case GTGTEQ: case GTEQ:
2307 case GTGTGT: case GTGT:
2308 token = S.split();
2309 break;
2310 case GT:
2311 nextToken();
2312 break;
2313 default:
2314 args.append(syntaxError(token.pos, Errors.Expected2(GT, COMMA)));
2315 break;
2316 }
2317 return args.toList();
2318 }
2319 } else {
2320 return List.of(syntaxError(token.pos, Errors.Expected(LT)));
2321 }
2322 }
2323
2324 /**
2325 * {@literal
2326 * TypeArgument = Type
2327 * | [Annotations] "?"
2328 * | [Annotations] "?" EXTENDS Type {"&" Type}
2329 * | [Annotations] "?" SUPER Type
2330 * }
2331 */
2332 JCExpression typeArgument() {
2333 List<JCAnnotation> annotations = typeAnnotationsOpt();
2334 if (token.kind != QUES) return parseType(false, annotations);
2335 int pos = token.pos;
2336 nextToken();
2337 JCExpression result;
2338 if (token.kind == EXTENDS) {
2339 TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.EXTENDS));
2340 nextToken();
2341 JCExpression bound = parseType();
2342 result = F.at(pos).Wildcard(t, bound);
2343 } else if (token.kind == SUPER) {
2344 TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.SUPER));
2345 nextToken();
2346 JCExpression bound = parseType();
2347 result = F.at(pos).Wildcard(t, bound);
2348 } else if (LAX_IDENTIFIER.test(token.kind)) {
2349 //error recovery
2350 TypeBoundKind t = F.at(Position.NOPOS).TypeBoundKind(BoundKind.UNBOUND);
2351 JCExpression wc = toP(F.at(pos).Wildcard(t, null));
2352 JCIdent id = toP(F.at(token.pos).Ident(ident()));
2353 JCErroneous err = F.at(pos).Erroneous(List.<JCTree>of(wc, id));
2354 reportSyntaxError(err, Errors.Expected3(GT, EXTENDS, SUPER));
2355 result = err;
2356 } else {
2357 TypeBoundKind t = toP(F.at(pos).TypeBoundKind(BoundKind.UNBOUND));
2358 result = toP(F.at(pos).Wildcard(t, null));
2359 }
2360 if (!annotations.isEmpty()) {
2361 result = toP(F.at(annotations.head.pos).AnnotatedType(annotations,result));
2362 }
2363 return result;
2364 }
2365
2366 JCTypeApply typeArguments(JCExpression t, boolean diamondAllowed) {
2367 int pos = token.pos;
2368 List<JCExpression> args = typeArguments(diamondAllowed);
2369 return toP(F.at(pos).TypeApply(t, args));
2370 }
2371
2372 /**
2373 * BracketsOpt = { [Annotations] "[" "]" }*
2374 *
2375 * <p>
2376 *
2377 * <code>annotations</code> is the list of annotations targeting
2378 * the expression <code>t</code>.
2379 */
2380 private JCExpression bracketsOpt(JCExpression t,
2381 List<JCAnnotation> annotations) {
2382 List<JCAnnotation> nextLevelAnnotations = typeAnnotationsOpt();
2383
2384 if (token.kind == LBRACKET) {
2385 int pos = token.pos;
2386 nextToken();
2387 t = bracketsOptCont(t, pos, nextLevelAnnotations);
2388 } else if (!nextLevelAnnotations.isEmpty()) {
2389 if (permitTypeAnnotationsPushBack) {
2390 this.typeAnnotationsPushedBack = nextLevelAnnotations;
2391 } else {
2392 return illegal(nextLevelAnnotations.head.pos);
2393 }
2394 }
2395
2396 if (!annotations.isEmpty()) {
2397 t = toP(F.at(token.pos).AnnotatedType(annotations, t));
2398 }
2399 return t;
2400 }
2401
2402 /** BracketsOpt = [ "[" "]" { [Annotations] "[" "]"} ]
2403 */
2404 private JCExpression bracketsOpt(JCExpression t) {
2405 return bracketsOpt(t, List.nil());
2406 }
2407
2408 private JCExpression bracketsOptCont(JCExpression t, int pos,
2409 List<JCAnnotation> annotations) {
2410 accept(RBRACKET);
2411 t = bracketsOpt(t);
2412 t = toP(F.at(pos).TypeArray(t));
2413 if (annotations.nonEmpty()) {
2414 t = toP(F.at(pos).AnnotatedType(annotations, t));
2415 }
2416 return t;
2417 }
2418
2419 /** BracketsSuffixExpr = "." CLASS
2420 * BracketsSuffixType =
2421 */
2422 JCExpression bracketsSuffix(JCExpression t) {
2423 if (isMode(EXPR) && token.kind == DOT) {
2424 selectExprMode();
2425 int pos = token.pos;
2426 nextToken();
2427 accept(CLASS);
2428 if (token.pos == endPosTable.errorEndPos) {
2429 // error recovery
2430 Name name;
2431 if (LAX_IDENTIFIER.test(token.kind)) {
2432 name = token.name();
2433 nextToken();
2434 } else {
2435 name = names.error;
2436 }
2437 t = F.at(pos).Erroneous(List.<JCTree>of(toP(F.at(pos).Select(t, name))));
2438 } else {
2439 Tag tag = t.getTag();
2440 // Type annotations are illegal on class literals. Annotated non array class literals
2441 // are complained about directly in term3(), Here check for type annotations on dimensions
2442 // taking care to handle some interior dimension(s) being annotated.
2443 if ((tag == TYPEARRAY && TreeInfo.containsTypeAnnotation(t)) || tag == ANNOTATED_TYPE)
2444 syntaxError(token.pos, Errors.NoAnnotationsOnDotClass);
2445 t = toP(F.at(pos).Select(t, names._class));
2446 }
2447 } else if (isMode(TYPE)) {
2448 if (token.kind != COLCOL) {
2449 selectTypeMode();
2450 }
2451 } else if (token.kind != COLCOL) {
2452 syntaxError(token.pos, Errors.DotClassExpected);
2453 }
2454 return t;
2455 }
2456
2457 /**
2458 * MemberReferenceSuffix = "::" [TypeArguments] Ident
2459 * | "::" [TypeArguments] "new"
2460 */
2461 JCExpression memberReferenceSuffix(JCExpression t) {
2462 int pos1 = token.pos;
2463 accept(COLCOL);
2464 return memberReferenceSuffix(pos1, t);
2465 }
2466
2467 JCExpression memberReferenceSuffix(int pos1, JCExpression t) {
2468 selectExprMode();
2469 List<JCExpression> typeArgs = null;
2470 if (token.kind == LT) {
2471 typeArgs = typeArguments(false);
2472 }
2473 Name refName;
2474 ReferenceMode refMode;
2475 if (token.kind == NEW) {
2476 refMode = ReferenceMode.NEW;
2477 refName = names.init;
2478 nextToken();
2479 } else {
2480 refMode = ReferenceMode.INVOKE;
2481 refName = ident();
2482 }
2483 return toP(F.at(t.getStartPosition()).Reference(refMode, refName, t, typeArgs));
2484 }
2485
2486 /** Creator = [Annotations] Qualident [TypeArguments] ( ArrayCreatorRest | ClassCreatorRest )
2487 */
2488 JCExpression creator(int newpos, List<JCExpression> typeArgs) {
2489 List<JCAnnotation> newAnnotations = typeAnnotationsOpt();
2490
2491 switch (token.kind) {
2492 case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
2493 case DOUBLE: case BOOLEAN:
2494 if (typeArgs == null) {
2495 if (newAnnotations.isEmpty()) {
2496 return arrayCreatorRest(newpos, basicType());
2497 } else {
2498 return arrayCreatorRest(newpos, toP(F.at(newAnnotations.head.pos).AnnotatedType(newAnnotations, basicType())));
2499 }
2500 }
2501 break;
2502 default:
2503 }
2504 JCExpression t = qualident(true);
2505
2506 int prevmode = mode;
2507 selectTypeMode();
2508 boolean diamondFound = false;
2509 int lastTypeargsPos = -1;
2510 if (token.kind == LT) {
2511 lastTypeargsPos = token.pos;
2512 t = typeArguments(t, true);
2513 diamondFound = isMode(DIAMOND);
2514 }
2515 while (token.kind == DOT) {
2516 if (diamondFound) {
2517 //cannot select after a diamond
2518 illegal();
2519 }
2520 int pos = token.pos;
2521 nextToken();
2522 List<JCAnnotation> tyannos = typeAnnotationsOpt();
2523 t = toP(F.at(pos).Select(t, ident()));
2524
2525 if (tyannos != null && tyannos.nonEmpty()) {
2526 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
2527 }
2528
2529 if (token.kind == LT) {
2530 lastTypeargsPos = token.pos;
2531 t = typeArguments(t, true);
2532 diamondFound = isMode(DIAMOND);
2533 }
2534 }
2535 setMode(prevmode);
2536 if (token.kind == LBRACKET || token.kind == MONKEYS_AT) {
2537 // handle type annotations for non primitive arrays
2538 if (newAnnotations.nonEmpty()) {
2539 t = insertAnnotationsToMostInner(t, newAnnotations, false);
2540 }
2541
2542 JCExpression e = arrayCreatorRest(newpos, t);
2543 if (diamondFound) {
2544 reportSyntaxError(lastTypeargsPos, Errors.CannotCreateArrayWithDiamond);
2545 return toP(F.at(newpos).Erroneous(List.of(e)));
2546 }
2547 else if (typeArgs != null) {
2548 int pos = newpos;
2549 if (!typeArgs.isEmpty() && typeArgs.head.pos != Position.NOPOS) {
2550 // note: this should always happen but we should
2551 // not rely on this as the parser is continuously
2552 // modified to improve error recovery.
2553 pos = typeArgs.head.pos;
2554 }
2555 setErrorEndPos(S.prevToken().endPos);
2556 JCErroneous err = F.at(pos).Erroneous(typeArgs.prepend(e));
2557 reportSyntaxError(err, Errors.CannotCreateArrayWithTypeArguments);
2558 return toP(err);
2559 }
2560 return e;
2561 } else if (token.kind == LPAREN) {
2562 // handle type annotations for instantiations and anonymous classes
2563 if (newAnnotations.nonEmpty()) {
2564 t = insertAnnotationsToMostInner(t, newAnnotations, false);
2565 }
2566 return classCreatorRest(newpos, null, typeArgs, t);
2567 } else {
2568 setErrorEndPos(token.pos);
2569 reportSyntaxError(token.pos, Errors.Expected2(LPAREN, LBRACKET));
2570 t = toP(F.at(newpos).NewClass(null, typeArgs, t, List.nil(), null));
2571 return toP(F.at(newpos).Erroneous(List.<JCTree>of(t)));
2572 }
2573 }
2574
2575 /** InnerCreator = [Annotations] Ident [TypeArguments] ClassCreatorRest
2576 */
2577 JCExpression innerCreator(int newpos, List<JCExpression> typeArgs, JCExpression encl) {
2578 List<JCAnnotation> newAnnotations = typeAnnotationsOpt();
2579
2580 JCExpression t = toP(F.at(token.pos).Ident(ident()));
2581
2582 if (newAnnotations.nonEmpty()) {
2583 t = toP(F.at(newAnnotations.head.pos).AnnotatedType(newAnnotations, t));
2584 }
2585
2586 if (token.kind == LT) {
2587 int prevmode = mode;
2588 t = typeArguments(t, true);
2589 setMode(prevmode);
2590 }
2591 return classCreatorRest(newpos, encl, typeArgs, t);
2592 }
2593
2594 /** ArrayCreatorRest = [Annotations] "[" ( "]" BracketsOpt ArrayInitializer
2595 * | Expression "]" {[Annotations] "[" Expression "]"} BracketsOpt )
2596 */
2597 JCExpression arrayCreatorRest(int newpos, JCExpression elemtype) {
2598 List<JCAnnotation> annos = typeAnnotationsOpt();
2599
2600 accept(LBRACKET);
2601 if (token.kind == RBRACKET) {
2602 accept(RBRACKET);
2603 elemtype = bracketsOpt(elemtype, annos);
2604 if (token.kind == LBRACE) {
2605 JCNewArray na = (JCNewArray)arrayInitializer(newpos, elemtype);
2606 if (annos.nonEmpty()) {
2607 // when an array initializer is present then
2608 // the parsed annotations should target the
2609 // new array tree
2610 // bracketsOpt inserts the annotation in
2611 // elemtype, and it needs to be corrected
2612 //
2613 JCAnnotatedType annotated = (JCAnnotatedType)elemtype;
2614 assert annotated.annotations == annos;
2615 na.annotations = annotated.annotations;
2616 na.elemtype = annotated.underlyingType;
2617 }
2618 return na;
2619 } else {
2620 JCExpression t = toP(F.at(newpos).NewArray(elemtype, List.nil(), null));
2621 return syntaxError(token.pos, List.of(t), Errors.ArrayDimensionMissing);
2622 }
2623 } else {
2624 ListBuffer<JCExpression> dims = new ListBuffer<>();
2625
2626 // maintain array dimension type annotations
2627 ListBuffer<List<JCAnnotation>> dimAnnotations = new ListBuffer<>();
2628 dimAnnotations.append(annos);
2629
2630 dims.append(parseExpression());
2631 accept(RBRACKET);
2632 while (token.kind == LBRACKET
2633 || token.kind == MONKEYS_AT) {
2634 List<JCAnnotation> maybeDimAnnos = typeAnnotationsOpt();
2635 int pos = token.pos;
2636 nextToken();
2637 if (token.kind == RBRACKET) { // no dimension
2638 elemtype = bracketsOptCont(elemtype, pos, maybeDimAnnos);
2639 } else {
2640 dimAnnotations.append(maybeDimAnnos);
2641 dims.append(parseExpression());
2642 accept(RBRACKET);
2643 }
2644 }
2645
2646 List<JCExpression> elems = null;
2647 int errpos = token.pos;
2648
2649 if (token.kind == LBRACE) {
2650 elems = arrayInitializerElements(newpos, elemtype);
2651 }
2652
2653 JCNewArray na = toP(F.at(newpos).NewArray(elemtype, dims.toList(), elems));
2654 na.dimAnnotations = dimAnnotations.toList();
2655
2656 if (elems != null) {
2657 return syntaxError(errpos, List.of(na), Errors.IllegalArrayCreationBothDimensionAndInitialization);
2658 }
2659
2660 return na;
2661 }
2662 }
2663
2664 /** ClassCreatorRest = Arguments [ClassBody]
2665 */
2666 JCNewClass classCreatorRest(int newpos,
2667 JCExpression encl,
2668 List<JCExpression> typeArgs,
2669 JCExpression t)
2670 {
2671 List<JCExpression> args = arguments();
2672 JCClassDecl body = null;
2673 if (token.kind == LBRACE) {
2674 int pos = token.pos;
2675 List<JCTree> defs = classInterfaceOrRecordBody(names.empty, false, false);
2676 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
2677 body = toP(F.at(pos).AnonymousClassDef(mods, defs));
2678 }
2679 return toP(F.at(newpos).NewClass(encl, typeArgs, t, args, body));
2680 }
2681
2682 /** ArrayInitializer = "{" [VariableInitializer {"," VariableInitializer}] [","] "}"
2683 */
2684 JCExpression arrayInitializer(int newpos, JCExpression t) {
2685 List<JCExpression> elems = arrayInitializerElements(newpos, t);
2686 return toP(F.at(newpos).NewArray(t, List.nil(), elems));
2687 }
2688
2689 List<JCExpression> arrayInitializerElements(int newpos, JCExpression t) {
2690 accept(LBRACE);
2691 ListBuffer<JCExpression> elems = new ListBuffer<>();
2692 if (token.kind == COMMA) {
2693 nextToken();
2694 } else if (token.kind != RBRACE) {
2695 elems.append(variableInitializer());
2696 while (token.kind == COMMA) {
2697 nextToken();
2698 if (token.kind == RBRACE) break;
2699 elems.append(variableInitializer());
2700 }
2701 }
2702 accept(RBRACE);
2703 return elems.toList();
2704 }
2705
2706 /** VariableInitializer = ArrayInitializer | Expression
2707 */
2708 public JCExpression variableInitializer() {
2709 return token.kind == LBRACE ? arrayInitializer(token.pos, null) : parseExpression();
2710 }
2711
2712 /** ParExpression = "(" Expression ")"
2713 */
2714 JCExpression parExpression() {
2715 int pos = token.pos;
2716 accept(LPAREN);
2717 JCExpression t = parseExpression();
2718 accept(RPAREN);
2719 return toP(F.at(pos).Parens(t));
2720 }
2721
2722 /** Block = "{" BlockStatements "}"
2723 */
2724 JCBlock block(int pos, long flags) {
2725 accept(LBRACE);
2726 List<JCStatement> stats = blockStatements();
2727 JCBlock t = F.at(pos).Block(flags, stats);
2728 while (token.kind == CASE || token.kind == DEFAULT) {
2729 syntaxError(token.pos, Errors.Orphaned(token.kind));
2730 switchBlockStatementGroups();
2731 }
2732 // the Block node has a field "endpos" for first char of last token, which is
2733 // usually but not necessarily the last char of the last token.
2734 t.endpos = token.pos;
2735 accept(RBRACE);
2736 return toP(t);
2737 }
2738
2739 public JCBlock block() {
2740 return block(token.pos, 0);
2741 }
2742
2743 /** BlockStatements = { BlockStatement }
2744 * BlockStatement = LocalVariableDeclarationStatement
2745 * | ClassOrInterfaceOrEnumDeclaration
2746 * | [Ident ":"] Statement
2747 * LocalVariableDeclarationStatement
2748 * = { FINAL | '@' Annotation } Type VariableDeclarators ";"
2749 */
2750 @SuppressWarnings("fallthrough")
2751 List<JCStatement> blockStatements() {
2752 //todo: skip to anchor on error(?)
2753 int lastErrPos = -1;
2754 ListBuffer<JCStatement> stats = new ListBuffer<>();
2755 while (true) {
2756 List<JCStatement> stat = blockStatement();
2757 if (stat.isEmpty()) {
2758 return stats.toList();
2759 } else {
2760 // error recovery
2761 if (token.pos == lastErrPos)
2762 return stats.toList();
2763 if (token.pos <= endPosTable.errorEndPos) {
2764 skip(false, true, true, true);
2765 lastErrPos = token.pos;
2766 }
2767 stats.addAll(stat);
2768 }
2769 }
2770 }
2771
2772 /*
2773 * Parse a Statement (JLS 14.5). As an enhancement to improve error recovery,
2774 * this method will also recognize variable and class declarations (which are
2775 * not legal for a Statement) by delegating the parsing to BlockStatement (JLS 14.2).
2776 * If any illegal declarations are found, they will be wrapped in an erroneous tree,
2777 * and an error will be produced by this method.
2778 */
2779 JCStatement parseStatementAsBlock() {
2780 int pos = token.pos;
2781 List<JCStatement> stats = blockStatement();
2782 if (stats.isEmpty()) {
2783 JCErroneous e = syntaxError(pos, Errors.IllegalStartOfStmt);
2784 return toP(F.at(pos).Exec(e));
2785 } else {
2786 JCStatement first = stats.head;
2787 Error error = null;
2788 switch (first.getTag()) {
2789 case CLASSDEF:
2790 error = Errors.ClassNotAllowed;
2791 break;
2792 case VARDEF:
2793 error = Errors.VariableNotAllowed;
2794 break;
2795 }
2796 if (error != null) {
2797 log.error(DiagnosticFlag.SYNTAX, first, error);
2798 List<JCBlock> blist = List.of(F.at(first.pos).Block(0, stats));
2799 return toP(F.at(pos).Exec(F.at(first.pos).Erroneous(blist)));
2800 }
2801 return first;
2802 }
2803 }
2804
2805 /**This method parses a statement appearing inside a block.
2806 */
2807 @SuppressWarnings("fallthrough")
2808 List<JCStatement> blockStatement() {
2809 //todo: skip to anchor on error(?)
2810 Comment dc;
2811 int pos = token.pos;
2812 switch (token.kind) {
2813 case RBRACE: case CASE: case DEFAULT: case EOF:
2814 return List.nil();
2815 case LBRACE: case IF: case FOR: case WHILE: case DO: case TRY:
2816 case SWITCH: case SYNCHRONIZED: case RETURN: case THROW: case BREAK:
2817 case CONTINUE: case SEMI: case ELSE: case FINALLY: case CATCH:
2818 case ASSERT:
2819 return List.of(parseSimpleStatement());
2820 case MONKEYS_AT:
2821 case FINAL: {
2822 dc = token.docComment();
2823 JCModifiers mods = modifiersOpt();
2824 if (isDeclaration()) {
2825 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(mods, dc));
2826 } else {
2827 JCExpression t = parseType(true);
2828 return localVariableDeclarations(mods, t);
2829 }
2830 }
2831 case ABSTRACT: case STRICTFP: {
2832 dc = token.docComment();
2833 JCModifiers mods = modifiersOpt();
2834 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(mods, dc));
2835 }
2836 case INTERFACE:
2837 case CLASS:
2838 dc = token.docComment();
2839 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
2840 case ENUM:
2841 if (!allowRecords) {
2842 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.LocalEnum);
2843 }
2844 dc = token.docComment();
2845 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
2846 case IDENTIFIER:
2847 if (token.name() == names.yield && allowYieldStatement) {
2848 Token next = S.token(1);
2849 boolean isYieldStatement;
2850 switch (next.kind) {
2851 case PLUS: case SUB: case STRINGLITERAL: case CHARLITERAL:
2852 case STRINGFRAGMENT:
2853 case INTLITERAL: case LONGLITERAL: case FLOATLITERAL: case DOUBLELITERAL:
2854 case NULL: case IDENTIFIER: case TRUE: case FALSE:
2855 case NEW: case SWITCH: case THIS: case SUPER:
2856 isYieldStatement = true;
2857 break;
2858 case PLUSPLUS: case SUBSUB:
2859 isYieldStatement = S.token(2).kind != SEMI;
2860 break;
2861 case BANG: case TILDE:
2862 isYieldStatement = S.token(1).kind != SEMI;
2863 break;
2864 case LPAREN:
2865 int lookahead = 2;
2866 int balance = 1;
2867 boolean hasComma = false;
2868 Token l;
2869 while ((l = S.token(lookahead)).kind != EOF && balance != 0) {
2870 switch (l.kind) {
2871 case LPAREN: balance++; break;
2872 case RPAREN: balance--; break;
2873 case COMMA: if (balance == 1) hasComma = true; break;
2874 }
2875 lookahead++;
2876 }
2877 isYieldStatement = (!hasComma && lookahead != 3) || l.kind == ARROW;
2878 break;
2879 case SEMI: //error recovery - this is not a valid statement:
2880 isYieldStatement = true;
2881 break;
2882 default:
2883 isYieldStatement = false;
2884 break;
2885 }
2886
2887 if (isYieldStatement) {
2888 nextToken();
2889 JCExpression t = term(EXPR);
2890 accept(SEMI);
2891 return List.of(toP(F.at(pos).Yield(t)));
2892 }
2893
2894 //else intentional fall-through
2895 } else {
2896 if (isNonSealedClassStart(true)) {
2897 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
2898 nextToken();
2899 nextToken();
2900 nextToken();
2901 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
2902 } else if (isSealedClassStart(true)) {
2903 checkSourceLevel(Feature.SEALED_CLASSES);
2904 log.error(token.pos, Errors.SealedOrNonSealedLocalClassesNotAllowed);
2905 nextToken();
2906 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(), token.docComment()));
2907 }
2908 }
2909 }
2910 if (isRecordStart() && allowRecords) {
2911 dc = token.docComment();
2912 return List.of(recordDeclaration(F.at(pos).Modifiers(0), dc));
2913 } else {
2914 Token prevToken = token;
2915 JCExpression t = term(EXPR | TYPE);
2916 if (token.kind == COLON && t.hasTag(IDENT)) {
2917 nextToken();
2918 JCStatement stat = parseStatementAsBlock();
2919 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
2920 } else if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
2921 pos = token.pos;
2922 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
2923 F.at(pos);
2924 return localVariableDeclarations(mods, t);
2925 } else {
2926 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
2927 t = checkExprStat(t);
2928 accept(SEMI);
2929 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
2930 return List.of(expr);
2931 }
2932 }
2933 }
2934 //where
2935 private List<JCStatement> localVariableDeclarations(JCModifiers mods, JCExpression type) {
2936 ListBuffer<JCStatement> stats =
2937 variableDeclarators(mods, type, new ListBuffer<>(), true);
2938 // A "LocalVariableDeclarationStatement" subsumes the terminating semicolon
2939 accept(SEMI);
2940 storeEnd(stats.last(), S.prevToken().endPos);
2941 return stats.toList();
2942 }
2943
2944 /** Statement =
2945 * Block
2946 * | IF ParExpression Statement [ELSE Statement]
2947 * | FOR "(" ForInitOpt ";" [Expression] ";" ForUpdateOpt ")" Statement
2948 * | FOR "(" FormalParameter : Expression ")" Statement
2949 * | WHILE ParExpression Statement
2950 * | DO Statement WHILE ParExpression ";"
2951 * | TRY Block ( Catches | [Catches] FinallyPart )
2952 * | TRY "(" ResourceSpecification ";"opt ")" Block [Catches] [FinallyPart]
2953 * | SWITCH ParExpression "{" SwitchBlockStatementGroups "}"
2954 * | SYNCHRONIZED ParExpression Block
2955 * | RETURN [Expression] ";"
2956 * | THROW Expression ";"
2957 * | BREAK [Ident] ";"
2958 * | CONTINUE [Ident] ";"
2959 * | ASSERT Expression [ ":" Expression ] ";"
2960 * | ";"
2961 */
2962 public JCStatement parseSimpleStatement() {
2963 int pos = token.pos;
2964 switch (token.kind) {
2965 case LBRACE:
2966 return block();
2967 case IF: {
2968 nextToken();
2969 JCExpression cond = parExpression();
2970 JCStatement thenpart = parseStatementAsBlock();
2971 JCStatement elsepart = null;
2972 if (token.kind == ELSE) {
2973 nextToken();
2974 elsepart = parseStatementAsBlock();
2975 }
2976 return F.at(pos).If(cond, thenpart, elsepart);
2977 }
2978 case FOR: {
2979 nextToken();
2980 accept(LPAREN);
2981 List<JCStatement> inits = token.kind == SEMI ? List.nil() : forInit();
2982 if (inits.length() == 1 &&
2983 inits.head.hasTag(VARDEF) &&
2984 ((JCVariableDecl) inits.head).init == null &&
2985 token.kind == COLON) {
2986 JCVariableDecl var = (JCVariableDecl)inits.head;
2987 accept(COLON);
2988 JCExpression expr = parseExpression();
2989 accept(RPAREN);
2990 JCStatement body = parseStatementAsBlock();
2991 return F.at(pos).ForeachLoop(var, expr, body);
2992 } else {
2993 accept(SEMI);
2994 JCExpression cond = token.kind == SEMI ? null : parseExpression();
2995 accept(SEMI);
2996 List<JCExpressionStatement> steps = token.kind == RPAREN ? List.nil() : forUpdate();
2997 accept(RPAREN);
2998 JCStatement body = parseStatementAsBlock();
2999 return F.at(pos).ForLoop(inits, cond, steps, body);
3000 }
3001 }
3002 case WHILE: {
3003 nextToken();
3004 JCExpression cond = parExpression();
3005 JCStatement body = parseStatementAsBlock();
3006 return F.at(pos).WhileLoop(cond, body);
3007 }
3008 case DO: {
3009 nextToken();
3010 JCStatement body = parseStatementAsBlock();
3011 accept(WHILE);
3012 JCExpression cond = parExpression();
3013 accept(SEMI);
3014 JCDoWhileLoop t = toP(F.at(pos).DoLoop(body, cond));
3015 return t;
3016 }
3017 case TRY: {
3018 nextToken();
3019 List<JCTree> resources = List.nil();
3020 if (token.kind == LPAREN) {
3021 nextToken();
3022 resources = resources();
3023 accept(RPAREN);
3024 }
3025 JCBlock body = block();
3026 ListBuffer<JCCatch> catchers = new ListBuffer<>();
3027 JCBlock finalizer = null;
3028 if (token.kind == CATCH || token.kind == FINALLY) {
3029 while (token.kind == CATCH) catchers.append(catchClause());
3030 if (token.kind == FINALLY) {
3031 nextToken();
3032 finalizer = block();
3033 }
3034 } else {
3035 if (resources.isEmpty()) {
3036 log.error(DiagnosticFlag.SYNTAX, pos, Errors.TryWithoutCatchFinallyOrResourceDecls);
3037 }
3038 }
3039 return F.at(pos).Try(resources, body, catchers.toList(), finalizer);
3040 }
3041 case SWITCH: {
3042 nextToken();
3043 JCExpression selector = parExpression();
3044 accept(LBRACE);
3045 List<JCCase> cases = switchBlockStatementGroups();
3046 JCSwitch t = to(F.at(pos).Switch(selector, cases));
3047 t.endpos = token.endPos;
3048 accept(RBRACE);
3049 return t;
3050 }
3051 case SYNCHRONIZED: {
3052 nextToken();
3053 JCExpression lock = parExpression();
3054 JCBlock body = block();
3055 return F.at(pos).Synchronized(lock, body);
3056 }
3057 case RETURN: {
3058 nextToken();
3059 JCExpression result = token.kind == SEMI ? null : parseExpression();
3060 accept(SEMI);
3061 JCReturn t = toP(F.at(pos).Return(result));
3062 return t;
3063 }
3064 case THROW: {
3065 nextToken();
3066 JCExpression exc = parseExpression();
3067 accept(SEMI);
3068 JCThrow t = toP(F.at(pos).Throw(exc));
3069 return t;
3070 }
3071 case BREAK: {
3072 nextToken();
3073 Name label = LAX_IDENTIFIER.test(token.kind) ? ident() : null;
3074 accept(SEMI);
3075 JCBreak t = toP(F.at(pos).Break(label));
3076 return t;
3077 }
3078 case CONTINUE: {
3079 nextToken();
3080 Name label = LAX_IDENTIFIER.test(token.kind) ? ident() : null;
3081 accept(SEMI);
3082 JCContinue t = toP(F.at(pos).Continue(label));
3083 return t;
3084 }
3085 case SEMI:
3086 nextToken();
3087 return toP(F.at(pos).Skip());
3088 case ELSE:
3089 int elsePos = token.pos;
3090 nextToken();
3091 return doRecover(elsePos, BasicErrorRecoveryAction.BLOCK_STMT, Errors.ElseWithoutIf);
3092 case FINALLY:
3093 int finallyPos = token.pos;
3094 nextToken();
3095 return doRecover(finallyPos, BasicErrorRecoveryAction.BLOCK_STMT, Errors.FinallyWithoutTry);
3096 case CATCH:
3097 return doRecover(token.pos, BasicErrorRecoveryAction.CATCH_CLAUSE, Errors.CatchWithoutTry);
3098 case ASSERT: {
3099 nextToken();
3100 JCExpression assertion = parseExpression();
3101 JCExpression message = null;
3102 if (token.kind == COLON) {
3103 nextToken();
3104 message = parseExpression();
3105 }
3106 accept(SEMI);
3107 JCAssert t = toP(F.at(pos).Assert(assertion, message));
3108 return t;
3109 }
3110 default:
3111 Assert.error();
3112 return null;
3113 }
3114 }
3115
3116 @Override
3117 public JCStatement parseStatement() {
3118 return parseStatementAsBlock();
3119 }
3120
3121 private JCStatement doRecover(int startPos, ErrorRecoveryAction action, Error errorKey) {
3122 int errPos = S.errPos();
3123 JCTree stm = action.doRecover(this);
3124 S.errPos(errPos);
3125 return toP(F.Exec(syntaxError(startPos, List.of(stm), errorKey)));
3126 }
3127
3128 /** CatchClause = CATCH "(" FormalParameter ")" Block
3129 * TODO: the "FormalParameter" is not correct, it uses the special "catchTypes" rule below.
3130 */
3131 protected JCCatch catchClause() {
3132 int pos = token.pos;
3133 accept(CATCH);
3134 accept(LPAREN);
3135 JCModifiers mods = optFinal(Flags.PARAMETER);
3136 List<JCExpression> catchTypes = catchTypes();
3137 JCExpression paramType = catchTypes.size() > 1 ?
3138 toP(F.at(catchTypes.head.getStartPosition()).TypeUnion(catchTypes)) :
3139 catchTypes.head;
3140 JCVariableDecl formal = variableDeclaratorId(mods, paramType, true, false, false);
3141 accept(RPAREN);
3142 JCBlock body = block();
3143 return F.at(pos).Catch(formal, body);
3144 }
3145
3146 List<JCExpression> catchTypes() {
3147 ListBuffer<JCExpression> catchTypes = new ListBuffer<>();
3148 catchTypes.add(parseType());
3149 while (token.kind == BAR) {
3150 nextToken();
3151 // Instead of qualident this is now parseType.
3152 // But would that allow too much, e.g. arrays or generics?
3153 catchTypes.add(parseType());
3154 }
3155 return catchTypes.toList();
3156 }
3157
3158 /** SwitchBlockStatementGroups = { SwitchBlockStatementGroup }
3159 * SwitchBlockStatementGroup = SwitchLabel BlockStatements
3160 * SwitchLabel = CASE ConstantExpression ":" | DEFAULT ":"
3161 */
3162 List<JCCase> switchBlockStatementGroups() {
3163 ListBuffer<JCCase> cases = new ListBuffer<>();
3164 while (true) {
3165 int pos = token.pos;
3166 switch (token.kind) {
3167 case CASE:
3168 case DEFAULT:
3169 cases.appendList(switchBlockStatementGroup());
3170 break;
3171 case RBRACE: case EOF:
3172 return cases.toList();
3173 default:
3174 nextToken(); // to ensure progress
3175 syntaxError(pos, Errors.Expected3(CASE, DEFAULT, RBRACE));
3176 }
3177 }
3178 }
3179
3180 protected List<JCCase> switchBlockStatementGroup() {
3181 int pos = token.pos;
3182 List<JCStatement> stats;
3183 JCCase c;
3184 ListBuffer<JCCase> cases = new ListBuffer<JCCase>();
3185 switch (token.kind) {
3186 case CASE: {
3187 nextToken();
3188 ListBuffer<JCCaseLabel> pats = new ListBuffer<>();
3189 boolean allowDefault = false;
3190 while (true) {
3191 JCCaseLabel label = parseCaseLabel(allowDefault);
3192 pats.append(label);
3193 if (token.kind != COMMA) break;
3194 nextToken();
3195 checkSourceLevel(Feature.SWITCH_MULTIPLE_CASE_LABELS);
3196 allowDefault = TreeInfo.isNullCaseLabel(label);
3197 };
3198 JCExpression guard = parseGuard(pats.last());
3199 CaseTree.CaseKind caseKind;
3200 JCTree body = null;
3201 if (token.kind == ARROW) {
3202 checkSourceLevel(Feature.SWITCH_RULE);
3203 accept(ARROW);
3204 caseKind = JCCase.RULE;
3205 JCStatement statement = parseStatementAsBlock();
3206 if (!statement.hasTag(EXEC) && !statement.hasTag(BLOCK) && !statement.hasTag(Tag.THROW)) {
3207 log.error(statement.pos(), Errors.SwitchCaseUnexpectedStatement);
3208 }
3209 stats = List.of(statement);
3210 body = stats.head;
3211 } else {
3212 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
3213 caseKind = JCCase.STATEMENT;
3214 stats = blockStatements();
3215 }
3216 c = F.at(pos).Case(caseKind, pats.toList(), guard, stats, body);
3217 if (stats.isEmpty())
3218 storeEnd(c, S.prevToken().endPos);
3219 return cases.append(c).toList();
3220 }
3221 case DEFAULT: {
3222 nextToken();
3223 JCCaseLabel defaultPattern = toP(F.at(pos).DefaultCaseLabel());
3224 JCExpression guard = parseGuard(defaultPattern);
3225 CaseTree.CaseKind caseKind;
3226 JCTree body = null;
3227 if (token.kind == ARROW) {
3228 checkSourceLevel(Feature.SWITCH_RULE);
3229 accept(ARROW);
3230 caseKind = JCCase.RULE;
3231 JCStatement statement = parseStatementAsBlock();
3232 if (!statement.hasTag(EXEC) && !statement.hasTag(BLOCK) && !statement.hasTag(Tag.THROW)) {
3233 log.error(statement.pos(), Errors.SwitchCaseUnexpectedStatement);
3234 }
3235 stats = List.of(statement);
3236 body = stats.head;
3237 } else {
3238 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
3239 caseKind = JCCase.STATEMENT;
3240 stats = blockStatements();
3241 }
3242 c = F.at(pos).Case(caseKind, List.of(defaultPattern), guard, stats, body);
3243 if (stats.isEmpty())
3244 storeEnd(c, S.prevToken().endPos);
3245 return cases.append(c).toList();
3246 }
3247 }
3248 throw new AssertionError("should not reach here");
3249 }
3250
3251 private JCCaseLabel parseCaseLabel(boolean allowDefault) {
3252 int patternPos = token.pos;
3253 JCCaseLabel label;
3254
3255 if (token.kind == DEFAULT) {
3256 checkSourceLevel(token.pos, Feature.PATTERN_SWITCH);
3257 if (!allowDefault) {
3258 reportSyntaxError(new SimpleDiagnosticPosition(token.pos),
3259 Errors.DefaultLabelNotAllowed);
3260 }
3261 nextToken();
3262 label = toP(F.at(patternPos).DefaultCaseLabel());
3263 } else {
3264 JCModifiers mods = optFinal(0);
3265 boolean pattern = mods.flags != 0 || mods.annotations.nonEmpty() ||
3266 analyzePattern(0) == PatternResult.PATTERN;
3267 if (pattern) {
3268 checkSourceLevel(token.pos, Feature.PATTERN_SWITCH);
3269 JCPattern p = parsePattern(patternPos, mods, null, false, true);
3270 return toP(F.at(patternPos).PatternCaseLabel(p));
3271 } else {
3272 JCExpression expr = term(EXPR | NOLAMBDA);
3273 return toP(F.at(patternPos).ConstantCaseLabel(expr));
3274 }
3275 }
3276
3277 return label;
3278 }
3279
3280 private JCExpression parseGuard(JCCaseLabel label) {
3281 JCExpression guard = null;
3282
3283 if (token.kind == IDENTIFIER && token.name() == names.when) {
3284 int pos = token.pos;
3285
3286 nextToken();
3287 guard = term(EXPR | NOLAMBDA);
3288
3289 if (!(label instanceof JCPatternCaseLabel)) {
3290 guard = syntaxError(pos, List.of(guard), Errors.GuardNotAllowed);
3291 }
3292 }
3293
3294 return guard;
3295 }
3296 @SuppressWarnings("fallthrough")
3297 PatternResult analyzePattern(int lookahead) {
3298 int typeDepth = 0;
3299 int parenDepth = 0;
3300 PatternResult pendingResult = PatternResult.EXPRESSION;
3301 while (true) {
3302 TokenKind token = S.token(lookahead).kind;
3303 switch (token) {
3304 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
3305 case DOUBLE: case BOOLEAN: case CHAR: case VOID:
3306 case ASSERT, ENUM, IDENTIFIER:
3307 if (typeDepth == 0 && peekToken(lookahead, LAX_IDENTIFIER)) {
3308 if (parenDepth == 0) {
3309 return PatternResult.PATTERN;
3310 } else {
3311 pendingResult = PatternResult.PATTERN;
3312 }
3313 } else if (typeDepth == 0 && parenDepth == 0 && (peekToken(lookahead, tk -> tk == ARROW || tk == COMMA))) {
3314 return PatternResult.EXPRESSION;
3315 }
3316 break;
3317 case UNDERSCORE:
3318 // TODO: REFACTOR to remove the code duplication
3319 if (typeDepth == 0 && peekToken(lookahead, tk -> tk == RPAREN || tk == COMMA)) {
3320 return PatternResult.PATTERN;
3321 } else if (typeDepth == 0 && peekToken(lookahead, LAX_IDENTIFIER)) {
3322 if (parenDepth == 0) {
3323 return PatternResult.PATTERN;
3324 } else {
3325 pendingResult = PatternResult.PATTERN;
3326 }
3327 }
3328 break;
3329 case DOT, QUES, EXTENDS, SUPER, COMMA: break;
3330 case LT: typeDepth++; break;
3331 case GTGTGT: typeDepth--;
3332 case GTGT: typeDepth--;
3333 case GT:
3334 typeDepth--;
3335 if (typeDepth == 0) {
3336 return peekToken(lookahead, LAX_IDENTIFIER) ||
3337 peekToken(lookahead, tk -> tk == LPAREN) ? PatternResult.PATTERN
3338 : PatternResult.EXPRESSION;
3339 } else if (typeDepth < 0) return PatternResult.EXPRESSION;
3340 break;
3341 case MONKEYS_AT:
3342 lookahead = skipAnnotation(lookahead);
3343 break;
3344 case LBRACKET:
3345 if (peekToken(lookahead, RBRACKET, LAX_IDENTIFIER)) {
3346 return PatternResult.PATTERN;
3347 } else if (peekToken(lookahead, RBRACKET)) {
3348 lookahead++;
3349 break;
3350 } else {
3351 // This is a potential guard, if we are already in a pattern
3352 return pendingResult;
3353 }
3354 case LPAREN:
3355 if (S.token(lookahead + 1).kind == RPAREN) {
3356 return parenDepth != 0 && S.token(lookahead + 2).kind == ARROW
3357 ? PatternResult.EXPRESSION
3358 : PatternResult.PATTERN;
3359 }
3360 parenDepth++; break;
3361 case RPAREN: parenDepth--; break;
3362 case ARROW: return parenDepth > 0 ? PatternResult.EXPRESSION
3363 : pendingResult;
3364 default: return pendingResult;
3365 }
3366 lookahead++;
3367 }
3368 }
3369
3370 private enum PatternResult {
3371 EXPRESSION,
3372 PATTERN;
3373 }
3374
3375 /** MoreStatementExpressions = { COMMA StatementExpression }
3376 */
3377 <T extends ListBuffer<? super JCExpressionStatement>> T moreStatementExpressions(int pos,
3378 JCExpression first,
3379 T stats) {
3380 // This Exec is a "StatementExpression"; it subsumes no terminating token
3381 stats.append(toP(F.at(pos).Exec(checkExprStat(first))));
3382 while (token.kind == COMMA) {
3383 nextToken();
3384 pos = token.pos;
3385 JCExpression t = parseExpression();
3386 // This Exec is a "StatementExpression"; it subsumes no terminating token
3387 stats.append(toP(F.at(pos).Exec(checkExprStat(t))));
3388 }
3389 return stats;
3390 }
3391
3392 /** ForInit = StatementExpression MoreStatementExpressions
3393 * | { FINAL | '@' Annotation } Type VariableDeclarators
3394 */
3395 List<JCStatement> forInit() {
3396 ListBuffer<JCStatement> stats = new ListBuffer<>();
3397 int pos = token.pos;
3398 if (token.kind == FINAL || token.kind == MONKEYS_AT) {
3399 return variableDeclarators(optFinal(0), parseType(true), stats, true).toList();
3400 } else {
3401 JCExpression t = term(EXPR | TYPE);
3402 if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3403 return variableDeclarators(modifiersOpt(), t, stats, true).toList();
3404 } else if (wasTypeMode() && token.kind == COLON) {
3405 log.error(DiagnosticFlag.SYNTAX, pos, Errors.BadInitializer("for-loop"));
3406 return List.of((JCStatement)F.at(pos).VarDef(modifiersOpt(), names.error, t, null));
3407 } else {
3408 return moreStatementExpressions(pos, t, stats).toList();
3409 }
3410 }
3411 }
3412
3413 /** ForUpdate = StatementExpression MoreStatementExpressions
3414 */
3415 List<JCExpressionStatement> forUpdate() {
3416 return moreStatementExpressions(token.pos,
3417 parseExpression(),
3418 new ListBuffer<JCExpressionStatement>()).toList();
3419 }
3420
3421 /** AnnotationsOpt = { '@' Annotation }
3422 *
3423 * @param kind Whether to parse an ANNOTATION or TYPE_ANNOTATION
3424 */
3425 protected List<JCAnnotation> annotationsOpt(Tag kind) {
3426 if (token.kind != MONKEYS_AT) return List.nil(); // optimization
3427 ListBuffer<JCAnnotation> buf = new ListBuffer<>();
3428 int prevmode = mode;
3429 while (token.kind == MONKEYS_AT) {
3430 int pos = token.pos;
3431 nextToken();
3432 buf.append(annotation(pos, kind));
3433 }
3434 setLastMode(mode);
3435 setMode(prevmode);
3436 List<JCAnnotation> annotations = buf.toList();
3437
3438 return annotations;
3439 }
3440
3441 List<JCAnnotation> typeAnnotationsOpt() {
3442 List<JCAnnotation> annotations = annotationsOpt(Tag.TYPE_ANNOTATION);
3443 return annotations;
3444 }
3445
3446 /** ModifiersOpt = { Modifier }
3447 * Modifier = PUBLIC | PROTECTED | PRIVATE | STATIC | ABSTRACT | FINAL
3448 * | NATIVE | SYNCHRONIZED | TRANSIENT | VOLATILE | "@"
3449 * | "@" Annotation
3450 */
3451 protected JCModifiers modifiersOpt() {
3452 return modifiersOpt(null);
3453 }
3454 protected JCModifiers modifiersOpt(JCModifiers partial) {
3455 long flags;
3456 ListBuffer<JCAnnotation> annotations = new ListBuffer<>();
3457 int pos;
3458 if (partial == null) {
3459 flags = 0;
3460 pos = token.pos;
3461 } else {
3462 flags = partial.flags;
3463 annotations.appendList(partial.annotations);
3464 pos = partial.pos;
3465 }
3466 if (token.deprecatedFlag()) {
3467 flags |= Flags.DEPRECATED;
3468 }
3469 int lastPos;
3470 loop:
3471 while (true) {
3472 long flag;
3473 switch (token.kind) {
3474 case PRIVATE : flag = Flags.PRIVATE; break;
3475 case PROTECTED : flag = Flags.PROTECTED; break;
3476 case PUBLIC : flag = Flags.PUBLIC; break;
3477 case STATIC : flag = Flags.STATIC; break;
3478 case TRANSIENT : flag = Flags.TRANSIENT; break;
3479 case FINAL : flag = Flags.FINAL; break;
3480 case ABSTRACT : flag = Flags.ABSTRACT; break;
3481 case NATIVE : flag = Flags.NATIVE; break;
3482 case VOLATILE : flag = Flags.VOLATILE; break;
3483 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
3484 case STRICTFP : flag = Flags.STRICTFP; break;
3485 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
3486 case DEFAULT : flag = Flags.DEFAULT; break;
3487 case ERROR : flag = 0; nextToken(); break;
3488 case IDENTIFIER : {
3489 if (isNonSealedClassStart(false)) {
3490 flag = Flags.NON_SEALED;
3491 nextToken();
3492 nextToken();
3493 break;
3494 }
3495 if (isSealedClassStart(false)) {
3496 checkSourceLevel(Feature.SEALED_CLASSES);
3497 flag = Flags.SEALED;
3498 break;
3499 }
3500 break loop;
3501 }
3502 default: break loop;
3503 }
3504 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3505 lastPos = token.pos;
3506 nextToken();
3507 if (flag == Flags.ANNOTATION) {
3508 if (token.kind != INTERFACE) {
3509 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
3510 // if first modifier is an annotation, set pos to annotation's.
3511 if (flags == 0 && annotations.isEmpty())
3512 pos = ann.pos;
3513 annotations.append(ann);
3514 flag = 0;
3515 }
3516 }
3517 flags |= flag;
3518 }
3519 switch (token.kind) {
3520 case ENUM: flags |= Flags.ENUM; break;
3521 case INTERFACE: flags |= Flags.INTERFACE; break;
3522 default: break;
3523 }
3524
3525 /* A modifiers tree with no modifier tokens or annotations
3526 * has no text position. */
3527 if ((flags & (Flags.ModifierFlags | Flags.ANNOTATION)) == 0 && annotations.isEmpty())
3528 pos = Position.NOPOS;
3529
3530 JCModifiers mods = F.at(pos).Modifiers(flags, annotations.toList());
3531 if (pos != Position.NOPOS)
3532 storeEnd(mods, S.prevToken().endPos);
3533 return mods;
3534 }
3535
3536 /** Annotation = "@" Qualident [ "(" AnnotationFieldValues ")" ]
3537 *
3538 * @param pos position of "@" token
3539 * @param kind Whether to parse an ANNOTATION or TYPE_ANNOTATION
3540 */
3541 JCAnnotation annotation(int pos, Tag kind) {
3542 // accept(AT); // AT consumed by caller
3543 JCTree ident = qualident(false);
3544 List<JCExpression> fieldValues = annotationFieldValuesOpt();
3545 JCAnnotation ann;
3546 if (kind == Tag.ANNOTATION) {
3547 ann = F.at(pos).Annotation(ident, fieldValues);
3548 } else if (kind == Tag.TYPE_ANNOTATION) {
3549 ann = F.at(pos).TypeAnnotation(ident, fieldValues);
3550 } else {
3551 throw new AssertionError("Unhandled annotation kind: " + kind);
3552 }
3553
3554 storeEnd(ann, S.prevToken().endPos);
3555 return ann;
3556 }
3557
3558 List<JCExpression> annotationFieldValuesOpt() {
3559 return (token.kind == LPAREN) ? annotationFieldValues() : List.nil();
3560 }
3561
3562 /** AnnotationFieldValues = "(" [ AnnotationFieldValue { "," AnnotationFieldValue } ] ")" */
3563 List<JCExpression> annotationFieldValues() {
3564 accept(LPAREN);
3565 ListBuffer<JCExpression> buf = new ListBuffer<>();
3566 if (token.kind != RPAREN) {
3567 buf.append(annotationFieldValue());
3568 while (token.kind == COMMA) {
3569 nextToken();
3570 buf.append(annotationFieldValue());
3571 }
3572 }
3573 accept(RPAREN);
3574 return buf.toList();
3575 }
3576
3577 /** AnnotationFieldValue = AnnotationValue
3578 * | Identifier "=" AnnotationValue
3579 */
3580 JCExpression annotationFieldValue() {
3581 if (LAX_IDENTIFIER.test(token.kind)) {
3582 selectExprMode();
3583 JCExpression t1 = term1();
3584 if (t1.hasTag(IDENT) && token.kind == EQ) {
3585 int pos = token.pos;
3586 accept(EQ);
3587 JCExpression v = annotationValue();
3588 return toP(F.at(pos).Assign(t1, v));
3589 } else {
3590 return t1;
3591 }
3592 }
3593 return annotationValue();
3594 }
3595
3596 /* AnnotationValue = ConditionalExpression
3597 * | Annotation
3598 * | "{" [ AnnotationValue { "," AnnotationValue } ] [","] "}"
3599 */
3600 JCExpression annotationValue() {
3601 int pos;
3602 switch (token.kind) {
3603 case MONKEYS_AT:
3604 pos = token.pos;
3605 nextToken();
3606 return annotation(pos, Tag.ANNOTATION);
3607 case LBRACE:
3608 pos = token.pos;
3609 accept(LBRACE);
3610 ListBuffer<JCExpression> buf = new ListBuffer<>();
3611 if (token.kind == COMMA) {
3612 nextToken();
3613 } else if (token.kind != RBRACE) {
3614 buf.append(annotationValue());
3615 while (token.kind == COMMA) {
3616 nextToken();
3617 if (token.kind == RBRACE) break;
3618 buf.append(annotationValue());
3619 }
3620 }
3621 accept(RBRACE, tk -> Errors.AnnotationMissingElementValue);
3622 return toP(F.at(pos).NewArray(null, List.nil(), buf.toList()));
3623 default:
3624 selectExprMode();
3625 return term1();
3626 }
3627 }
3628
3629 /** VariableDeclarators = VariableDeclarator { "," VariableDeclarator }
3630 */
3631 public <T extends ListBuffer<? super JCVariableDecl>> T variableDeclarators(JCModifiers mods,
3632 JCExpression type,
3633 T vdefs,
3634 boolean localDecl)
3635 {
3636 return variableDeclaratorsRest(token.pos, mods, type, identOrUnderscore(), false, null, vdefs, localDecl);
3637 }
3638
3639 /** VariableDeclaratorsRest = VariableDeclaratorRest { "," VariableDeclarator }
3640 * ConstantDeclaratorsRest = ConstantDeclaratorRest { "," ConstantDeclarator }
3641 *
3642 * @param reqInit Is an initializer always required?
3643 * @param dc The documentation comment for the variable declarations, or null.
3644 */
3645 protected <T extends ListBuffer<? super JCVariableDecl>> T variableDeclaratorsRest(int pos,
3646 JCModifiers mods,
3647 JCExpression type,
3648 Name name,
3649 boolean reqInit,
3650 Comment dc,
3651 T vdefs,
3652 boolean localDecl)
3653 {
3654 JCVariableDecl head = variableDeclaratorRest(pos, mods, type, name, reqInit, dc, localDecl, false);
3655 vdefs.append(head);
3656 while (token.kind == COMMA) {
3657 // All but last of multiple declarators subsume a comma
3658 storeEnd((JCTree)vdefs.last(), token.endPos);
3659 nextToken();
3660 vdefs.append(variableDeclarator(mods, type, reqInit, dc, localDecl));
3661 }
3662 return vdefs;
3663 }
3664
3665 /** VariableDeclarator = Ident VariableDeclaratorRest
3666 * ConstantDeclarator = Ident ConstantDeclaratorRest
3667 */
3668 JCVariableDecl variableDeclarator(JCModifiers mods, JCExpression type, boolean reqInit, Comment dc, boolean localDecl) {
3669 return variableDeclaratorRest(token.pos, mods, type, identOrUnderscore(), reqInit, dc, localDecl, true);
3670 }
3671
3672 /** VariableDeclaratorRest = BracketsOpt ["=" VariableInitializer]
3673 * ConstantDeclaratorRest = BracketsOpt "=" VariableInitializer
3674 *
3675 * @param reqInit Is an initializer always required?
3676 * @param dc The documentation comment for the variable declarations, or null.
3677 */
3678 JCVariableDecl variableDeclaratorRest(int pos, JCModifiers mods, JCExpression type, Name name,
3679 boolean reqInit, Comment dc, boolean localDecl, boolean compound) {
3680 boolean declaredUsingVar = false;
3681 JCExpression init = null;
3682 type = bracketsOpt(type);
3683
3684 if (Feature.UNNAMED_VARIABLES.allowedInSource(source) && name == names.underscore) {
3685 if (!localDecl) {
3686 log.error(DiagnosticFlag.SYNTAX, pos, Errors.UseOfUnderscoreNotAllowed);
3687 }
3688 name = names.empty;
3689 }
3690
3691 if (token.kind == EQ) {
3692 nextToken();
3693 init = variableInitializer();
3694 }
3695 else if (reqInit) syntaxError(token.pos, Errors.Expected(EQ));
3696
3697 if (Feature.UNNAMED_VARIABLES.allowedInSource(source) && name == names.empty
3698 && localDecl
3699 && init == null
3700 && token.kind != COLON) { // if its unnamed local variable, it needs to have an init unless in enhanced-for
3701 syntaxError(token.pos, Errors.Expected(EQ));
3702 }
3703
3704 int startPos = Position.NOPOS;
3705 JCTree elemType = TreeInfo.innermostType(type, true);
3706 if (elemType.hasTag(IDENT)) {
3707 Name typeName = ((JCIdent) elemType).name;
3708 if (restrictedTypeNameStartingAtSource(typeName, pos, !compound && localDecl) != null) {
3709 if (typeName != names.var) {
3710 reportSyntaxError(elemType.pos, Errors.RestrictedTypeNotAllowedHere(typeName));
3711 } else if (type.hasTag(TYPEARRAY) && !compound) {
3712 //error - 'var' and arrays
3713 reportSyntaxError(elemType.pos, Errors.RestrictedTypeNotAllowedArray(typeName));
3714 } else {
3715 declaredUsingVar = true;
3716 if (compound)
3717 //error - 'var' in compound local var decl
3718 reportSyntaxError(elemType.pos, Errors.RestrictedTypeNotAllowedCompound(typeName));
3719 startPos = TreeInfo.getStartPos(mods);
3720 if (startPos == Position.NOPOS)
3721 startPos = TreeInfo.getStartPos(type);
3722 //implicit type
3723 type = null;
3724 }
3725 }
3726 }
3727 JCVariableDecl result = toP(F.at(pos).VarDef(mods, name, type, init, declaredUsingVar));
3728 attach(result, dc);
3729 result.startPos = startPos;
3730 return result;
3731 }
3732
3733 Name restrictedTypeName(JCExpression e, boolean shouldWarn) {
3734 switch (e.getTag()) {
3735 case IDENT:
3736 return restrictedTypeNameStartingAtSource(((JCIdent)e).name, e.pos, shouldWarn) != null ? ((JCIdent)e).name : null;
3737 case TYPEARRAY:
3738 return restrictedTypeName(((JCArrayTypeTree)e).elemtype, shouldWarn);
3739 default:
3740 return null;
3741 }
3742 }
3743
3744 Source restrictedTypeNameStartingAtSource(Name name, int pos, boolean shouldWarn) {
3745 if (name == names.var) {
3746 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3747 return Source.JDK10;
3748 } else if (shouldWarn) {
3749 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK10));
3750 }
3751 }
3752 if (name == names.yield) {
3753 if (allowYieldStatement) {
3754 return Source.JDK14;
3755 } else if (shouldWarn) {
3756 log.warning(pos, Warnings.RestrictedTypeNotAllowed(name, Source.JDK14));
3757 }
3758 }
3759 if (name == names.record) {
3760 if (allowRecords) {
3761 return Source.JDK14;
3762 } else if (shouldWarn) {
3763 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK14));
3764 }
3765 }
3766 if (name == names.sealed) {
3767 if (allowSealedTypes) {
3768 return Source.JDK15;
3769 } else if (shouldWarn) {
3770 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3771 }
3772 }
3773 if (name == names.permits) {
3774 if (allowSealedTypes) {
3775 return Source.JDK15;
3776 } else if (shouldWarn) {
3777 log.warning(pos, Warnings.RestrictedTypeNotAllowedPreview(name, Source.JDK15));
3778 }
3779 }
3780 return null;
3781 }
3782
3783 /** VariableDeclaratorId = Ident BracketsOpt
3784 */
3785 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean catchParameter, boolean lambdaParameter, boolean recordComponent) {
3786 int pos = token.pos;
3787 Name name;
3788 if (allowThisIdent ||
3789 !lambdaParameter ||
3790 LAX_IDENTIFIER.test(token.kind) ||
3791 mods.flags != Flags.PARAMETER ||
3792 mods.annotations.nonEmpty()) {
3793 JCExpression pn;
3794 if (token.kind == UNDERSCORE && (catchParameter || lambdaParameter)) {
3795 pn = toP(F.at(token.pos).Ident(identOrUnderscore()));
3796 } else {
3797 pn = qualident(false);
3798 }
3799 if (pn.hasTag(Tag.IDENT) && ((JCIdent)pn).name != names._this) {
3800 name = ((JCIdent)pn).name;
3801 } else if (lambdaParameter && type == null) {
3802 // we have a lambda parameter that is not an identifier this is a syntax error
3803 type = pn;
3804 name = names.empty;
3805 reportSyntaxError(pos, Errors.Expected(IDENTIFIER));
3806 } else {
3807 if (allowThisIdent) {
3808 if ((mods.flags & Flags.VARARGS) != 0) {
3809 log.error(token.pos, Errors.VarargsAndReceiver);
3810 }
3811 if (token.kind == LBRACKET) {
3812 log.error(token.pos, Errors.ArrayAndReceiver);
3813 }
3814 if (pn.hasTag(Tag.SELECT) && ((JCFieldAccess)pn).name != names._this) {
3815 log.error(token.pos, Errors.WrongReceiver);
3816 }
3817 }
3818 return toP(F.at(pos).ReceiverVarDef(mods, pn, type));
3819 }
3820 } else {
3821 /** if it is a lambda parameter and the token kind is not an identifier,
3822 * and there are no modifiers or annotations, then this means that the compiler
3823 * supposed the lambda to be explicit but it can contain a mix of implicit,
3824 * var or explicit parameters. So we assign the error name to the parameter name
3825 * instead of issuing an error and analyze the lambda parameters as a whole at
3826 * a higher level.
3827 */
3828 name = names.error;
3829 }
3830 if ((mods.flags & Flags.VARARGS) != 0 &&
3831 token.kind == LBRACKET) {
3832 log.error(token.pos, Errors.VarargsAndOldArraySyntax);
3833 }
3834 if (recordComponent && token.kind == LBRACKET) {
3835 log.error(token.pos, Errors.RecordComponentAndOldArraySyntax);
3836 }
3837 type = bracketsOpt(type);
3838
3839 if (Feature.UNNAMED_VARIABLES.allowedInSource(source) && name == names.underscore) {
3840 name = names.empty;
3841 }
3842
3843 return toP(F.at(pos).VarDef(mods, name, type, null,
3844 type != null && type.hasTag(IDENT) && ((JCIdent)type).name == names.var));
3845 }
3846
3847 /** Resources = Resource { ";" Resources }
3848 */
3849 List<JCTree> resources() {
3850 ListBuffer<JCTree> defs = new ListBuffer<>();
3851 defs.append(resource());
3852 while (token.kind == SEMI) {
3853 // All but last of multiple declarators must subsume a semicolon
3854 storeEnd(defs.last(), token.endPos);
3855 int semiColonPos = token.pos;
3856 nextToken();
3857 if (token.kind == RPAREN) { // Optional trailing semicolon
3858 // after last resource
3859 break;
3860 }
3861 defs.append(resource());
3862 }
3863 return defs.toList();
3864 }
3865
3866 /** Resource = VariableModifiersOpt Type VariableDeclaratorId "=" Expression
3867 * | Expression
3868 */
3869 protected JCTree resource() {
3870 if (token.kind == FINAL || token.kind == MONKEYS_AT) {
3871 JCModifiers mods = optFinal(0);
3872 JCExpression t = parseType(true);
3873 return variableDeclaratorRest(token.pos, mods, t, identOrUnderscore(), true, null, true, false);
3874 }
3875 JCExpression t = term(EXPR | TYPE);
3876 if (wasTypeMode() && LAX_IDENTIFIER.test(token.kind)) {
3877 JCModifiers mods = F.Modifiers(0);
3878 return variableDeclaratorRest(token.pos, mods, t, identOrUnderscore(), true, null, true, false);
3879 } else {
3880 checkSourceLevel(Feature.EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES);
3881 if (!t.hasTag(IDENT) && !t.hasTag(SELECT)) {
3882 log.error(t.pos(), Errors.TryWithResourcesExprNeedsVar);
3883 }
3884
3885 return t;
3886 }
3887 }
3888
3889 /** CompilationUnit = [ { "@" Annotation } PACKAGE Qualident ";"] {ImportDeclaration} {TypeDeclaration}
3890 */
3891 public JCTree.JCCompilationUnit parseCompilationUnit() {
3892 Token firstToken = token;
3893 JCModifiers mods = null;
3894 boolean consumedToplevelDoc = false;
3895 boolean seenImport = false;
3896 boolean seenPackage = false;
3897 ListBuffer<JCTree> defs = new ListBuffer<>();
3898 if (token.kind == MONKEYS_AT)
3899 mods = modifiersOpt();
3900
3901 if (token.kind == PACKAGE) {
3902 int packagePos = token.pos;
3903 List<JCAnnotation> annotations = List.nil();
3904 seenPackage = true;
3905 if (mods != null) {
3906 checkNoMods(mods.flags & ~Flags.DEPRECATED);
3907 annotations = mods.annotations;
3908 mods = null;
3909 }
3910 nextToken();
3911 JCExpression pid = qualident(false);
3912 accept(SEMI);
3913 JCPackageDecl pd = toP(F.at(packagePos).PackageDecl(annotations, pid));
3914 attach(pd, firstToken.docComment());
3915 consumedToplevelDoc = true;
3916 defs.append(pd);
3917 }
3918
3919 boolean firstTypeDecl = true; // have we see a class, enum, or interface declaration yet?
3920 boolean isUnnamedClass = false;
3921 OUTER: while (token.kind != EOF) {
3922 if (token.pos <= endPosTable.errorEndPos) {
3923 // error recovery
3924 skip(firstTypeDecl, false, false, false);
3925 if (token.kind == EOF)
3926 break;
3927 }
3928 // JLS 7.3 doesn't allow extra semicolons after package or import declarations,
3929 // but here we try to provide a more helpful error message if we encounter any.
3930 // Do that by slurping in as many semicolons as possible, and then seeing what
3931 // comes after before deciding how best to handle them.
3932 ListBuffer<JCTree> semiList = new ListBuffer<>();
3933 while (firstTypeDecl && mods == null && token.kind == SEMI) {
3934 semiList.append(toP(F.at(token.pos).Skip()));
3935 nextToken();
3936 if (token.kind == EOF)
3937 break OUTER;
3938 }
3939 if (firstTypeDecl && mods == null && token.kind == IMPORT) {
3940 if (!semiList.isEmpty()) {
3941 if (source.compareTo(Source.JDK21) >= 0)
3942 reportSyntaxError(semiList.first().pos, Errors.ExtraneousSemicolon);
3943 else
3944 log.warning(semiList.first().pos, Warnings.ExtraneousSemicolon);
3945 }
3946 seenImport = true;
3947 defs.append(importDeclaration());
3948 } else {
3949 Comment docComment = token.docComment();
3950 if (firstTypeDecl && !seenImport && !seenPackage) {
3951 docComment = firstToken.docComment();
3952 consumedToplevelDoc = true;
3953 }
3954 if (mods != null || token.kind != SEMI)
3955 mods = modifiersOpt(mods);
3956 if (firstTypeDecl && token.kind == IDENTIFIER) {
3957 if (!semiList.isEmpty()) {
3958 if (source.compareTo(Source.JDK21) >= 0)
3959 reportSyntaxError(semiList.first().pos, Errors.ExtraneousSemicolon);
3960 else
3961 log.warning(semiList.first().pos, Warnings.ExtraneousSemicolon);
3962 }
3963 ModuleKind kind = ModuleKind.STRONG;
3964 if (token.name() == names.open) {
3965 kind = ModuleKind.OPEN;
3966 nextToken();
3967 }
3968 if (token.kind == IDENTIFIER && token.name() == names.module) {
3969 if (mods != null) {
3970 checkNoMods(mods.flags & ~Flags.DEPRECATED);
3971 }
3972 defs.append(moduleDecl(mods, kind, docComment));
3973 consumedToplevelDoc = true;
3974 break;
3975 } else if (kind != ModuleKind.STRONG) {
3976 reportSyntaxError(token.pos, Errors.ExpectedModule);
3977 }
3978 }
3979
3980 defs.appendList(semiList.toList());
3981 boolean isTopLevelMethodOrField = false;
3982
3983 // Do to a significant number of existing negative tests
3984 // this code speculatively tests to see if a top level method
3985 // or field can parse. If the method or field can parse then
3986 // it is parsed. Otherwise, parsing continues as though
3987 // unnamed classes did not exist and error reporting
3988 // is the same as in the past.
3989 if (Feature.UNNAMED_CLASSES.allowedInSource(source) && !isDeclaration()) {
3990 final JCModifiers finalMods = mods;
3991 JavacParser speculative = new VirtualParser(this);
3992 List<JCTree> speculativeResult =
3993 speculative.topLevelMethodOrFieldDeclaration(finalMods);
3994 if (speculativeResult.head.hasTag(METHODDEF) ||
3995 speculativeResult.head.hasTag(VARDEF)) {
3996 isTopLevelMethodOrField = true;
3997 }
3998 }
3999
4000 if (isTopLevelMethodOrField) {
4001 checkSourceLevel(token.pos, Feature.UNNAMED_CLASSES);
4002 defs.appendList(topLevelMethodOrFieldDeclaration(mods));
4003 isUnnamedClass = true;
4004 } else {
4005 JCTree def = typeDeclaration(mods, docComment);
4006 if (def instanceof JCExpressionStatement statement)
4007 def = statement.expr;
4008 defs.append(def);
4009 }
4010
4011 mods = null;
4012 firstTypeDecl = false;
4013 }
4014 }
4015 List<JCTree> topLevelDefs = isUnnamedClass ? constructUnnamedClass(defs.toList()) : defs.toList();
4016 JCTree.JCCompilationUnit toplevel = F.at(firstToken.pos).TopLevel(topLevelDefs);
4017 if (!consumedToplevelDoc)
4018 attach(toplevel, firstToken.docComment());
4019 if (defs.isEmpty())
4020 storeEnd(toplevel, S.prevToken().endPos);
4021 if (keepDocComments)
4022 toplevel.docComments = docComments;
4023 if (keepLineMap)
4024 toplevel.lineMap = S.getLineMap();
4025 this.endPosTable.setParser(null); // remove reference to parser
4026 toplevel.endPositions = this.endPosTable;
4027 return toplevel;
4028 }
4029
4030 // Restructure top level to be an unnamed class.
4031 private List<JCTree> constructUnnamedClass(List<JCTree> origDefs) {
4032 ListBuffer<JCTree> topDefs = new ListBuffer<>();
4033 ListBuffer<JCTree> defs = new ListBuffer<>();
4034
4035 for (JCTree def : origDefs) {
4036 if (def.hasTag(Tag.PACKAGEDEF)) {
4037 log.error(def.pos(), Errors.UnnamedClassShouldNotHavePackageDeclaration);
4038 } else if (def.hasTag(Tag.IMPORT)) {
4039 topDefs.append(def);
4040 } else if (!def.hasTag(Tag.SKIP)) {
4041 defs.append(def);
4042 }
4043 }
4044
4045 int primaryPos = getStartPos(defs.first());
4046 String simplename = PathFileObject.getSimpleName(log.currentSourceFile());
4047
4048 if (simplename.endsWith(".java")) {
4049 simplename = simplename.substring(0, simplename.length() - ".java".length());
4050 }
4051 if (!SourceVersion.isIdentifier(simplename) || SourceVersion.isKeyword(simplename)) {
4052 log.error(primaryPos, Errors.BadFileName(simplename));
4053 }
4054
4055 Name name = names.fromString(simplename);
4056 JCModifiers unnamedMods = F.at(Position.NOPOS)
4057 .Modifiers(Flags.FINAL|Flags.SYNTHETIC|Flags.UNNAMED_CLASS, List.nil());
4058 JCClassDecl unnamed = F.at(primaryPos).ClassDef(
4059 unnamedMods, name, List.nil(), null, List.nil(), List.nil(),
4060 defs.toList());
4061 topDefs.append(unnamed);
4062 return topDefs.toList();
4063 }
4064
4065 JCModuleDecl moduleDecl(JCModifiers mods, ModuleKind kind, Comment dc) {
4066 int pos = token.pos;
4067 checkSourceLevel(Feature.MODULES);
4068
4069 nextToken();
4070 JCExpression name = qualident(false);
4071 List<JCDirective> directives = null;
4072
4073 accept(LBRACE);
4074 directives = moduleDirectiveList();
4075 accept(RBRACE);
4076 accept(EOF);
4077
4078 JCModuleDecl result = toP(F.at(pos).ModuleDef(mods, kind, name, directives));
4079 attach(result, dc);
4080 return result;
4081 }
4082
4083 List<JCDirective> moduleDirectiveList() {
4084 ListBuffer<JCDirective> defs = new ListBuffer<>();
4085 while (token.kind == IDENTIFIER) {
4086 int pos = token.pos;
4087 if (token.name() == names.requires) {
4088 nextToken();
4089 boolean isTransitive = false;
4090 boolean isStaticPhase = false;
4091 loop:
4092 while (true) {
4093 switch (token.kind) {
4094 case IDENTIFIER:
4095 if (token.name() == names.transitive && !isTransitive) {
4096 Token t1 = S.token(1);
4097 if (t1.kind == SEMI || t1.kind == DOT) {
4098 break loop;
4099 }
4100 isTransitive = true;
4101 break;
4102 } else {
4103 break loop;
4104 }
4105 case STATIC:
4106 if (isStaticPhase) {
4107 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
4108 }
4109 isStaticPhase = true;
4110 break;
4111 default:
4112 break loop;
4113 }
4114 nextToken();
4115 }
4116 JCExpression moduleName = qualident(false);
4117 accept(SEMI);
4118 defs.append(toP(F.at(pos).Requires(isTransitive, isStaticPhase, moduleName)));
4119 } else if (token.name() == names.exports || token.name() == names.opens) {
4120 boolean exports = token.name() == names.exports;
4121 nextToken();
4122 JCExpression pkgName = qualident(false);
4123 List<JCExpression> moduleNames = null;
4124 if (token.kind == IDENTIFIER && token.name() == names.to) {
4125 nextToken();
4126 moduleNames = qualidentList(false);
4127 }
4128 accept(SEMI);
4129 JCDirective d;
4130 if (exports) {
4131 d = F.at(pos).Exports(pkgName, moduleNames);
4132 } else {
4133 d = F.at(pos).Opens(pkgName, moduleNames);
4134 }
4135 defs.append(toP(d));
4136 } else if (token.name() == names.provides) {
4137 nextToken();
4138 JCExpression serviceName = qualident(false);
4139 List<JCExpression> implNames;
4140 if (token.kind == IDENTIFIER && token.name() == names.with) {
4141 nextToken();
4142 implNames = qualidentList(false);
4143 } else {
4144 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.ExpectedStr("'" + names.with + "'"));
4145 implNames = List.nil();
4146 }
4147 accept(SEMI);
4148 defs.append(toP(F.at(pos).Provides(serviceName, implNames)));
4149 } else if (token.name() == names.uses) {
4150 nextToken();
4151 JCExpression service = qualident(false);
4152 accept(SEMI);
4153 defs.append(toP(F.at(pos).Uses(service)));
4154 } else {
4155 setErrorEndPos(pos);
4156 reportSyntaxError(pos, Errors.InvalidModuleDirective);
4157 break;
4158 }
4159 }
4160 return defs.toList();
4161 }
4162
4163 /** ImportDeclaration = IMPORT [ STATIC ] Ident { "." Ident } [ "." "*" ] ";"
4164 */
4165 protected JCTree importDeclaration() {
4166 int pos = token.pos;
4167 nextToken();
4168 boolean importStatic = false;
4169 if (token.kind == STATIC) {
4170 importStatic = true;
4171 nextToken();
4172 }
4173 JCExpression pid = toP(F.at(token.pos).Ident(ident()));
4174 do {
4175 int pos1 = token.pos;
4176 accept(DOT);
4177 if (token.kind == STAR) {
4178 pid = to(F.at(pos1).Select(pid, names.asterisk));
4179 nextToken();
4180 break;
4181 } else {
4182 pid = toP(F.at(pos1).Select(pid, ident()));
4183 }
4184 } while (token.kind == DOT);
4185 accept(SEMI);
4186 return toP(F.at(pos).Import((JCFieldAccess)pid, importStatic));
4187 }
4188
4189 /** TypeDeclaration = ClassOrInterfaceOrEnumDeclaration
4190 * | ";"
4191 */
4192 JCTree typeDeclaration(JCModifiers mods, Comment docComment) {
4193 int pos = token.pos;
4194 if (mods == null && token.kind == SEMI) {
4195 nextToken();
4196 return toP(F.at(pos).Skip());
4197 } else {
4198 return classOrRecordOrInterfaceOrEnumDeclaration(modifiersOpt(mods), docComment);
4199 }
4200 }
4201
4202 /** ClassOrInterfaceOrEnumDeclaration = ModifiersOpt
4203 * (ClassDeclaration | InterfaceDeclaration | EnumDeclaration)
4204 * @param mods Any modifiers starting the class or interface declaration
4205 * @param dc The documentation comment for the class, or null.
4206 */
4207 protected JCStatement classOrRecordOrInterfaceOrEnumDeclaration(JCModifiers mods, Comment dc) {
4208 if (token.kind == CLASS) {
4209 return classDeclaration(mods, dc);
4210 } if (isRecordStart()) {
4211 return recordDeclaration(mods, dc);
4212 } else if (token.kind == INTERFACE) {
4213 return interfaceDeclaration(mods, dc);
4214 } else if (token.kind == ENUM) {
4215 return enumDeclaration(mods, dc);
4216 } else {
4217 int pos = token.pos;
4218 List<JCTree> errs;
4219 if (LAX_IDENTIFIER.test(token.kind)) {
4220 errs = List.of(mods, toP(F.at(pos).Ident(ident())));
4221 setErrorEndPos(token.pos);
4222 } else {
4223 errs = List.of(mods);
4224 }
4225
4226 JCDiagnostic.Error error;
4227 if (parseModuleInfo) {
4228 error = Errors.ExpectedModuleOrOpen;
4229 } else if (allowRecords) {
4230 error = Errors.Expected4(CLASS, INTERFACE, ENUM, "record");
4231 } else {
4232 error = Errors.Expected3(CLASS, INTERFACE, ENUM);
4233 }
4234 return toP(F.Exec(syntaxError(pos, errs, error)));
4235
4236 }
4237 }
4238
4239 /** ClassDeclaration = CLASS Ident TypeParametersOpt [EXTENDS Type]
4240 * [IMPLEMENTS TypeList] ClassBody
4241 * @param mods The modifiers starting the class declaration
4242 * @param dc The documentation comment for the class, or null.
4243 */
4244 protected JCClassDecl classDeclaration(JCModifiers mods, Comment dc) {
4245 int pos = token.pos;
4246 accept(CLASS);
4247 Name name = typeName();
4248
4249 List<JCTypeParameter> typarams = typeParametersOpt();
4250
4251 JCExpression extending = null;
4252 if (token.kind == EXTENDS) {
4253 nextToken();
4254 extending = parseType();
4255 }
4256 List<JCExpression> implementing = List.nil();
4257 if (token.kind == IMPLEMENTS) {
4258 nextToken();
4259 implementing = typeList();
4260 }
4261 List<JCExpression> permitting = permitsClause(mods, "class");
4262 List<JCTree> defs = classInterfaceOrRecordBody(name, false, false);
4263 JCClassDecl result = toP(F.at(pos).ClassDef(
4264 mods, name, typarams, extending, implementing, permitting, defs));
4265 attach(result, dc);
4266 return result;
4267 }
4268
4269 protected JCClassDecl recordDeclaration(JCModifiers mods, Comment dc) {
4270 int pos = token.pos;
4271 nextToken();
4272 mods.flags |= Flags.RECORD;
4273 Name name = typeName();
4274
4275 List<JCTypeParameter> typarams = typeParametersOpt();
4276
4277 List<JCVariableDecl> headerFields = formalParameters(false, true);
4278
4279 List<JCExpression> implementing = List.nil();
4280 if (token.kind == IMPLEMENTS) {
4281 nextToken();
4282 implementing = typeList();
4283 }
4284 List<JCTree> defs = classInterfaceOrRecordBody(name, false, true);
4285 java.util.List<JCVariableDecl> fields = new ArrayList<>();
4286 for (JCVariableDecl field : headerFields) {
4287 fields.add(field);
4288 }
4289 for (JCTree def : defs) {
4290 if (def.hasTag(METHODDEF)) {
4291 JCMethodDecl methDef = (JCMethodDecl) def;
4292 if (methDef.name == names.init && methDef.params.isEmpty() && (methDef.mods.flags & Flags.COMPACT_RECORD_CONSTRUCTOR) != 0) {
4293 ListBuffer<JCVariableDecl> tmpParams = new ListBuffer<>();
4294 for (JCVariableDecl param : headerFields) {
4295 tmpParams.add(F.at(param)
4296 // we will get flags plus annotations from the record component
4297 .VarDef(F.Modifiers(Flags.PARAMETER | Flags.GENERATED_MEMBER | Flags.MANDATED | param.mods.flags & Flags.VARARGS,
4298 param.mods.annotations),
4299 param.name, param.vartype, null));
4300 }
4301 methDef.params = tmpParams.toList();
4302 }
4303 }
4304 }
4305 for (int i = fields.size() - 1; i >= 0; i--) {
4306 JCVariableDecl field = fields.get(i);
4307 defs = defs.prepend(field);
4308 }
4309 JCClassDecl result = toP(F.at(pos).ClassDef(mods, name, typarams, null, implementing, defs));
4310 attach(result, dc);
4311 return result;
4312 }
4313
4314 Name typeName() {
4315 int pos = token.pos;
4316 Name name = ident();
4317 Source source = restrictedTypeNameStartingAtSource(name, pos, true);
4318 if (source != null) {
4319 reportSyntaxError(pos, Errors.RestrictedTypeNotAllowed(name, source));
4320 }
4321 return name;
4322 }
4323
4324 /** InterfaceDeclaration = INTERFACE Ident TypeParametersOpt
4325 * [EXTENDS TypeList] InterfaceBody
4326 * @param mods The modifiers starting the interface declaration
4327 * @param dc The documentation comment for the interface, or null.
4328 */
4329 protected JCClassDecl interfaceDeclaration(JCModifiers mods, Comment dc) {
4330 int pos = token.pos;
4331 accept(INTERFACE);
4332
4333 Name name = typeName();
4334
4335 List<JCTypeParameter> typarams = typeParametersOpt();
4336
4337 List<JCExpression> extending = List.nil();
4338 if (token.kind == EXTENDS) {
4339 nextToken();
4340 extending = typeList();
4341 }
4342 List<JCExpression> permitting = permitsClause(mods, "interface");
4343 List<JCTree> defs;
4344 defs = classInterfaceOrRecordBody(name, true, false);
4345 JCClassDecl result = toP(F.at(pos).ClassDef(
4346 mods, name, typarams, null, extending, permitting, defs));
4347 attach(result, dc);
4348 return result;
4349 }
4350
4351 List<JCExpression> permitsClause(JCModifiers mods, String classOrInterface) {
4352 if (allowSealedTypes && token.kind == IDENTIFIER && token.name() == names.permits) {
4353 checkSourceLevel(Feature.SEALED_CLASSES);
4354 if ((mods.flags & Flags.SEALED) == 0) {
4355 log.error(token.pos, Errors.InvalidPermitsClause(Fragments.ClassIsNotSealed(classOrInterface)));
4356 }
4357 nextToken();
4358 return qualidentList(false);
4359 }
4360 return List.nil();
4361 }
4362
4363 /** EnumDeclaration = ENUM Ident [IMPLEMENTS TypeList] EnumBody
4364 * @param mods The modifiers starting the enum declaration
4365 * @param dc The documentation comment for the enum, or null.
4366 */
4367 protected JCClassDecl enumDeclaration(JCModifiers mods, Comment dc) {
4368 int pos = token.pos;
4369 accept(ENUM);
4370
4371 Name name = typeName();
4372
4373 int typeNamePos = token.pos;
4374 List<JCTypeParameter> typarams = typeParametersOpt(true);
4375 if (typarams == null || !typarams.isEmpty()) {
4376 int errorPosition = typarams == null
4377 ? typeNamePos
4378 : typarams.head.pos;
4379 log.error(DiagnosticFlag.SYNTAX, errorPosition, Errors.EnumCantBeGeneric);
4380 }
4381
4382 List<JCExpression> implementing = List.nil();
4383 if (token.kind == IMPLEMENTS) {
4384 nextToken();
4385 implementing = typeList();
4386 }
4387
4388 List<JCTree> defs = enumBody(name);
4389 mods.flags |= Flags.ENUM;
4390 JCClassDecl result = toP(F.at(pos).
4391 ClassDef(mods, name, List.nil(),
4392 null, implementing, defs));
4393 attach(result, dc);
4394 return result;
4395 }
4396
4397 /** EnumBody = "{" { EnumeratorDeclarationList } [","]
4398 * [ ";" {ClassBodyDeclaration} ] "}"
4399 */
4400 List<JCTree> enumBody(Name enumName) {
4401 accept(LBRACE);
4402 ListBuffer<JCTree> defs = new ListBuffer<>();
4403 boolean wasSemi = false;
4404 boolean hasStructuralErrors = false;
4405 boolean wasError = false;
4406 if (token.kind == COMMA) {
4407 nextToken();
4408 if (token.kind == SEMI) {
4409 wasSemi = true;
4410 nextToken();
4411 } else if (token.kind != RBRACE) {
4412 reportSyntaxError(S.prevToken().endPos,
4413 Errors.Expected2(RBRACE, SEMI));
4414 wasError = true;
4415 }
4416 }
4417 while (token.kind != RBRACE && token.kind != EOF) {
4418 if (token.kind == SEMI) {
4419 accept(SEMI);
4420 wasSemi = true;
4421 if (token.kind == RBRACE || token.kind == EOF) break;
4422 }
4423 EnumeratorEstimate memberType = estimateEnumeratorOrMember(enumName);
4424 if (memberType == EnumeratorEstimate.UNKNOWN) {
4425 memberType = wasSemi ? EnumeratorEstimate.MEMBER
4426 : EnumeratorEstimate.ENUMERATOR;
4427 }
4428 if (memberType == EnumeratorEstimate.ENUMERATOR) {
4429 wasError = false;
4430 if (wasSemi && !hasStructuralErrors) {
4431 reportSyntaxError(token.pos, Errors.EnumConstantNotExpected);
4432 hasStructuralErrors = true;
4433 }
4434 defs.append(enumeratorDeclaration(enumName));
4435 if (token.pos <= endPosTable.errorEndPos) {
4436 // error recovery
4437 skip(false, true, true, false);
4438 } else {
4439 if (token.kind != RBRACE && token.kind != SEMI && token.kind != EOF) {
4440 if (token.kind == COMMA) {
4441 nextToken();
4442 } else {
4443 setErrorEndPos(token.pos);
4444 reportSyntaxError(S.prevToken().endPos,
4445 Errors.Expected3(COMMA, RBRACE, SEMI));
4446 wasError = true;
4447 }
4448 }
4449 }
4450 } else {
4451 if (!wasSemi && !hasStructuralErrors && !wasError) {
4452 reportSyntaxError(token.pos, Errors.EnumConstantExpected);
4453 hasStructuralErrors = true;
4454 }
4455 wasError = false;
4456 defs.appendList(classOrInterfaceOrRecordBodyDeclaration(null, enumName,
4457 false, false));
4458 if (token.pos <= endPosTable.errorEndPos) {
4459 // error recovery
4460 skip(false, true, true, false);
4461 }
4462 }
4463 }
4464 accept(RBRACE);
4465 return defs.toList();
4466 }
4467
4468 @SuppressWarnings("fallthrough")
4469 private EnumeratorEstimate estimateEnumeratorOrMember(Name enumName) {
4470 // if we are seeing a record declaration inside of an enum we want the same error message as expected for a
4471 // let's say an interface declaration inside an enum
4472 boolean ident = token.kind == TokenKind.IDENTIFIER ||
4473 token.kind == TokenKind.UNDERSCORE;
4474 if (ident && token.name() != enumName &&
4475 (!allowRecords || !isRecordStart())) {
4476 Token next = S.token(1);
4477 switch (next.kind) {
4478 case LPAREN: case LBRACE: case COMMA: case SEMI:
4479 return EnumeratorEstimate.ENUMERATOR;
4480 }
4481 }
4482 switch (token.kind) {
4483 case IDENTIFIER:
4484 if (allowRecords && isRecordStart()) {
4485 return EnumeratorEstimate.MEMBER;
4486 }
4487 case MONKEYS_AT: case LT: case UNDERSCORE:
4488 return EnumeratorEstimate.UNKNOWN;
4489 default:
4490 return EnumeratorEstimate.MEMBER;
4491 }
4492 }
4493
4494 private enum EnumeratorEstimate {
4495 ENUMERATOR,
4496 MEMBER,
4497 UNKNOWN;
4498 }
4499
4500 /** EnumeratorDeclaration = AnnotationsOpt [TypeArguments] IDENTIFIER [ Arguments ] [ "{" ClassBody "}" ]
4501 */
4502 JCTree enumeratorDeclaration(Name enumName) {
4503 Comment dc = token.docComment();
4504 int flags = Flags.PUBLIC|Flags.STATIC|Flags.FINAL|Flags.ENUM;
4505 if (token.deprecatedFlag()) {
4506 flags |= Flags.DEPRECATED;
4507 }
4508 int pos = token.pos;
4509 List<JCAnnotation> annotations = annotationsOpt(Tag.ANNOTATION);
4510 JCModifiers mods = F.at(annotations.isEmpty() ? Position.NOPOS : pos).Modifiers(flags, annotations);
4511 List<JCExpression> typeArgs = typeArgumentsOpt();
4512 int identPos = token.pos;
4513 Name name = ident();
4514 int createPos = token.pos;
4515 List<JCExpression> args = (token.kind == LPAREN)
4516 ? arguments() : List.nil();
4517 JCClassDecl body = null;
4518 if (token.kind == LBRACE) {
4519 JCModifiers mods1 = F.at(Position.NOPOS).Modifiers(Flags.ENUM);
4520 List<JCTree> defs = classInterfaceOrRecordBody(names.empty, false, false);
4521 body = toP(F.at(identPos).AnonymousClassDef(mods1, defs));
4522 }
4523 if (args.isEmpty() && body == null)
4524 createPos = identPos;
4525 JCIdent ident = F.at(identPos).Ident(enumName);
4526 JCNewClass create = F.at(createPos).NewClass(null, typeArgs, ident, args, body);
4527 if (createPos != identPos)
4528 storeEnd(create, S.prevToken().endPos);
4529 ident = F.at(identPos).Ident(enumName);
4530 JCTree result = toP(F.at(pos).VarDef(mods, name, ident, create));
4531 attach(result, dc);
4532 return result;
4533 }
4534
4535 /** TypeList = Type {"," Type}
4536 */
4537 List<JCExpression> typeList() {
4538 ListBuffer<JCExpression> ts = new ListBuffer<>();
4539 ts.append(parseType());
4540 while (token.kind == COMMA) {
4541 nextToken();
4542 ts.append(parseType());
4543 }
4544 return ts.toList();
4545 }
4546
4547 /** ClassBody = "{" {ClassBodyDeclaration} "}"
4548 * InterfaceBody = "{" {InterfaceBodyDeclaration} "}"
4549 */
4550 List<JCTree> classInterfaceOrRecordBody(Name className, boolean isInterface, boolean isRecord) {
4551 accept(LBRACE);
4552 if (token.pos <= endPosTable.errorEndPos) {
4553 // error recovery
4554 skip(false, true, false, false);
4555 if (token.kind == LBRACE)
4556 nextToken();
4557 else
4558 return List.nil();
4559 }
4560 ListBuffer<JCTree> defs = new ListBuffer<>();
4561 while (token.kind != RBRACE && token.kind != EOF) {
4562 defs.appendList(classOrInterfaceOrRecordBodyDeclaration(null, className, isInterface, isRecord));
4563 if (token.pos <= endPosTable.errorEndPos) {
4564 // error recovery
4565 skip(false, true, true, false);
4566 }
4567 }
4568 accept(RBRACE);
4569 return defs.toList();
4570 }
4571
4572 /** ClassBodyDeclaration =
4573 * ";"
4574 * | [STATIC] Block
4575 * | ModifiersOpt
4576 * ( Type Ident
4577 * ( VariableDeclaratorsRest ";" | MethodDeclaratorRest )
4578 * | VOID Ident VoidMethodDeclaratorRest
4579 * | TypeParameters [Annotations]
4580 * ( Type Ident MethodDeclaratorRest
4581 * | VOID Ident VoidMethodDeclaratorRest
4582 * )
4583 * | Ident ConstructorDeclaratorRest
4584 * | TypeParameters Ident ConstructorDeclaratorRest
4585 * | ClassOrInterfaceOrEnumDeclaration
4586 * )
4587 * InterfaceBodyDeclaration =
4588 * ";"
4589 * | ModifiersOpt
4590 * ( Type Ident
4591 * ( ConstantDeclaratorsRest ";" | MethodDeclaratorRest )
4592 * | VOID Ident MethodDeclaratorRest
4593 * | TypeParameters [Annotations]
4594 * ( Type Ident MethodDeclaratorRest
4595 * | VOID Ident VoidMethodDeclaratorRest
4596 * )
4597 * | ClassOrInterfaceOrEnumDeclaration
4598 * )
4599 *
4600 */
4601 protected List<JCTree> classOrInterfaceOrRecordBodyDeclaration(JCModifiers mods, Name className,
4602 boolean isInterface,
4603 boolean isRecord) {
4604 if (token.kind == SEMI) {
4605 nextToken();
4606 return List.nil();
4607 } else {
4608 Comment dc = token.docComment();
4609 int pos = token.pos;
4610 mods = modifiersOpt(mods);
4611 if (isDeclaration()) {
4612 return List.of(classOrRecordOrInterfaceOrEnumDeclaration(mods, dc));
4613 } else if (token.kind == LBRACE &&
4614 (mods.flags & Flags.StandardFlags & ~Flags.STATIC) == 0 &&
4615 mods.annotations.isEmpty()) {
4616 if (isInterface) {
4617 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.InitializerNotAllowed);
4618 } else if (isRecord && (mods.flags & Flags.STATIC) == 0) {
4619 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.InstanceInitializerNotAllowedInRecords);
4620 }
4621 return List.of(block(pos, mods.flags));
4622 } else {
4623 return constructorOrMethodOrFieldDeclaration(mods, className, isInterface, isRecord, dc);
4624 }
4625 }
4626 }
4627
4628 private List<JCTree> constructorOrMethodOrFieldDeclaration(JCModifiers mods, Name className,
4629 boolean isInterface,
4630 boolean isRecord, Comment dc) {
4631 int pos;
4632 pos = token.pos;
4633 List<JCTypeParameter> typarams = typeParametersOpt();
4634 // if there are type parameters but no modifiers, save the start
4635 // position of the method in the modifiers.
4636 if (typarams.nonEmpty() && mods.pos == Position.NOPOS) {
4637 mods.pos = pos;
4638 storeEnd(mods, pos);
4639 }
4640 List<JCAnnotation> annosAfterParams = annotationsOpt(Tag.ANNOTATION);
4641
4642 if (annosAfterParams.nonEmpty()) {
4643 mods.annotations = mods.annotations.appendList(annosAfterParams);
4644 if (mods.pos == Position.NOPOS)
4645 mods.pos = mods.annotations.head.pos;
4646 }
4647
4648 Token tk = token;
4649 pos = token.pos;
4650 JCExpression type;
4651 boolean isVoid = token.kind == VOID;
4652
4653 if (isVoid) {
4654 type = to(F.at(pos).TypeIdent(TypeTag.VOID));
4655 nextToken();
4656 } else {
4657 // method returns types are un-annotated types
4658 type = unannotatedType(false);
4659 }
4660
4661 // Constructor
4662 if ((token.kind == LPAREN && !isInterface ||
4663 isRecord && token.kind == LBRACE) && type.hasTag(IDENT)) {
4664 if (isInterface || tk.name() != className) {
4665 log.error(DiagnosticFlag.SYNTAX, pos, Errors.InvalidMethDeclRetTypeReq);
4666 } else if (annosAfterParams.nonEmpty()) {
4667 illegal(annosAfterParams.head.pos);
4668 }
4669
4670 if (isRecord && token.kind == LBRACE) {
4671 mods.flags |= Flags.COMPACT_RECORD_CONSTRUCTOR;
4672 }
4673
4674 return List.of(methodDeclaratorRest(
4675 pos, mods, null, names.init, typarams,
4676 isInterface, true, isRecord, dc));
4677 }
4678
4679 // Record constructor
4680 if (isRecord && type.hasTag(IDENT) && token.kind == THROWS) {
4681 // trying to define a compact constructor with a throws clause
4682 log.error(DiagnosticFlag.SYNTAX, token.pos,
4683 Errors.InvalidCanonicalConstructorInRecord(
4684 Fragments.Compact,
4685 className,
4686 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(Fragments.Compact)));
4687 skip(false, true, false, false);
4688 return List.of(methodDeclaratorRest(
4689 pos, mods, null, names.init, typarams,
4690 isInterface, true, isRecord, dc));
4691 }
4692
4693 pos = token.pos;
4694 Name name = ident();
4695
4696 // Method
4697 if (token.kind == LPAREN) {
4698 return List.of(methodDeclaratorRest(
4699 pos, mods, type, name, typarams,
4700 isInterface, isVoid, false, dc));
4701 }
4702
4703 // Field
4704 if (!isVoid && typarams.isEmpty()) {
4705 if (!isRecord || (isRecord && (mods.flags & Flags.STATIC) != 0)) {
4706 List<JCTree> defs =
4707 variableDeclaratorsRest(pos, mods, type, name, isInterface, dc,
4708 new ListBuffer<JCTree>(), false).toList();
4709 accept(SEMI);
4710 storeEnd(defs.last(), S.prevToken().endPos);
4711 return defs;
4712 }
4713
4714 int errPos = pos;
4715 variableDeclaratorsRest(pos, mods, type, name, isInterface, dc,
4716 new ListBuffer<JCTree>(), false).toList();
4717 accept(SEMI);
4718 return List.of(syntaxError(errPos, null, Errors.RecordCannotDeclareInstanceFields));
4719 }
4720
4721 pos = token.pos;
4722 List<JCTree> err;
4723
4724 // Error recovery
4725 if (isVoid || typarams.nonEmpty()) {
4726 JCMethodDecl m =
4727 toP(F.at(pos).MethodDef(mods, name, type, typarams,
4728 List.nil(), List.nil(), null, null));
4729 attach(m, dc);
4730 err = List.of(m);
4731 } else {
4732 err = List.nil();
4733 }
4734
4735 return List.of(syntaxError(token.pos, err, Errors.Expected(LPAREN)));
4736 }
4737
4738 private List<JCTree> topLevelMethodOrFieldDeclaration(JCModifiers mods) throws AssertionError {
4739 int topPos = token.pos;
4740 int pos = token.pos;
4741 Comment dc = token.docComment();
4742 List<JCTypeParameter> typarams = typeParametersOpt();
4743
4744 // if there are type parameters but no modifiers, save the start
4745 // position of the method in the modifiers.
4746 if (typarams.nonEmpty() && mods.pos == Position.NOPOS) {
4747 mods.pos = pos;
4748 storeEnd(mods, pos);
4749 }
4750
4751 List<JCAnnotation> annosAfterParams = annotationsOpt(Tag.ANNOTATION);
4752
4753 if (annosAfterParams.nonEmpty()) {
4754 mods.annotations = mods.annotations.appendList(annosAfterParams);
4755 if (mods.pos == Position.NOPOS)
4756 mods.pos = mods.annotations.head.pos;
4757 }
4758
4759 pos = token.pos;
4760 JCExpression type;
4761 boolean isVoid = token.kind == VOID;
4762
4763 if (isVoid) {
4764 type = to(F.at(pos).TypeIdent(TypeTag.VOID));
4765 nextToken();
4766 } else {
4767 type = unannotatedType(false);
4768 }
4769
4770 if (token.kind == IDENTIFIER) {
4771 pos = token.pos;
4772 Name name = ident();
4773
4774 // Method
4775 if (token.kind == LPAREN) {
4776 return List.of(methodDeclaratorRest(pos, mods, type, name, typarams,
4777 false, isVoid, false, dc));
4778 }
4779
4780 // Field
4781 if (!isVoid && typarams.isEmpty() && (token.kind == EQ || token.kind == SEMI)) {
4782 List<JCTree> defs =
4783 variableDeclaratorsRest(pos, mods, type, name, false, dc,
4784 new ListBuffer<JCTree>(), false).toList();
4785 accept(SEMI);
4786 storeEnd(defs.last(), S.prevToken().endPos);
4787
4788 return defs;
4789 }
4790 }
4791
4792 return List.of(F.Erroneous());
4793 }
4794
4795 protected boolean isDeclaration() {
4796 return token.kind == CLASS ||
4797 token.kind == INTERFACE ||
4798 token.kind == ENUM ||
4799 isRecordStart() && allowRecords;
4800 }
4801
4802 protected boolean isRecordStart() {
4803 if (token.kind == IDENTIFIER && token.name() == names.record && peekToken(TokenKind.IDENTIFIER)) {
4804 checkSourceLevel(Feature.RECORDS);
4805 return true;
4806 } else {
4807 return false;
4808 }
4809 }
4810
4811 protected boolean isNonSealedClassStart(boolean local) {
4812 if (isNonSealedIdentifier(token, 0)) {
4813 Token next = S.token(3);
4814 return allowedAfterSealedOrNonSealed(next, local, true);
4815 }
4816 return false;
4817 }
4818
4819 protected boolean isNonSealedIdentifier(Token someToken, int lookAheadOffset) {
4820 if (someToken.name() == names.non && peekToken(lookAheadOffset, TokenKind.SUB, TokenKind.IDENTIFIER)) {
4821 Token tokenSub = S.token(lookAheadOffset + 1);
4822 Token tokenSealed = S.token(lookAheadOffset + 2);
4823 if (someToken.endPos == tokenSub.pos &&
4824 tokenSub.endPos == tokenSealed.pos &&
4825 tokenSealed.name() == names.sealed) {
4826 checkSourceLevel(Feature.SEALED_CLASSES);
4827 return true;
4828 }
4829 }
4830 return false;
4831 }
4832
4833 protected boolean isSealedClassStart(boolean local) {
4834 if (token.name() == names.sealed) {
4835 Token next = S.token(1);
4836 if (allowedAfterSealedOrNonSealed(next, local, false)) {
4837 checkSourceLevel(Feature.SEALED_CLASSES);
4838 return true;
4839 }
4840 }
4841 return false;
4842 }
4843
4844 private boolean allowedAfterSealedOrNonSealed(Token next, boolean local, boolean currentIsNonSealed) {
4845 return local ?
4846 switch (next.kind) {
4847 case MONKEYS_AT -> {
4848 Token afterNext = S.token(2);
4849 yield afterNext.kind != INTERFACE || currentIsNonSealed;
4850 }
4851 case ABSTRACT, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
4852 default -> false;
4853 } :
4854 switch (next.kind) {
4855 case MONKEYS_AT -> {
4856 Token afterNext = S.token(2);
4857 yield afterNext.kind != INTERFACE || currentIsNonSealed;
4858 }
4859 case PUBLIC, PROTECTED, PRIVATE, ABSTRACT, STATIC, FINAL, STRICTFP, CLASS, INTERFACE, ENUM -> true;
4860 case IDENTIFIER -> isNonSealedIdentifier(next, currentIsNonSealed ? 3 : 1) || next.name() == names.sealed;
4861 default -> false;
4862 };
4863 }
4864
4865 /** MethodDeclaratorRest =
4866 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
4867 * VoidMethodDeclaratorRest =
4868 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
4869 * ConstructorDeclaratorRest =
4870 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
4871 */
4872 protected JCTree methodDeclaratorRest(int pos,
4873 JCModifiers mods,
4874 JCExpression type,
4875 Name name,
4876 List<JCTypeParameter> typarams,
4877 boolean isInterface, boolean isVoid,
4878 boolean isRecord,
4879 Comment dc) {
4880 if (isInterface) {
4881 if ((mods.flags & Flags.PRIVATE) != 0) {
4882 checkSourceLevel(Feature.PRIVATE_INTERFACE_METHODS);
4883 }
4884 }
4885 JCVariableDecl prevReceiverParam = this.receiverParam;
4886 try {
4887 this.receiverParam = null;
4888 // Parsing formalParameters sets the receiverParam, if present
4889 List<JCVariableDecl> params = List.nil();
4890 List<JCExpression> thrown = List.nil();
4891 if (!isRecord || name != names.init || token.kind == LPAREN) {
4892 params = formalParameters();
4893 if (!isVoid) type = bracketsOpt(type);
4894 if (token.kind == THROWS) {
4895 nextToken();
4896 thrown = qualidentList(true);
4897 }
4898 }
4899 JCBlock body = null;
4900 JCExpression defaultValue;
4901 if (token.kind == LBRACE) {
4902 body = block();
4903 defaultValue = null;
4904 } else {
4905 if (token.kind == DEFAULT) {
4906 accept(DEFAULT);
4907 defaultValue = annotationValue();
4908 } else {
4909 defaultValue = null;
4910 }
4911 accept(SEMI);
4912 if (token.pos <= endPosTable.errorEndPos) {
4913 // error recovery
4914 skip(false, true, false, false);
4915 if (token.kind == LBRACE) {
4916 body = block();
4917 }
4918 }
4919 }
4920
4921 JCMethodDecl result =
4922 toP(F.at(pos).MethodDef(mods, name, type, typarams,
4923 receiverParam, params, thrown,
4924 body, defaultValue));
4925 attach(result, dc);
4926 return result;
4927 } finally {
4928 this.receiverParam = prevReceiverParam;
4929 }
4930 }
4931
4932 /** QualidentList = [Annotations] Qualident {"," [Annotations] Qualident}
4933 */
4934 List<JCExpression> qualidentList(boolean allowAnnos) {
4935 ListBuffer<JCExpression> ts = new ListBuffer<>();
4936
4937 List<JCAnnotation> typeAnnos = allowAnnos ? typeAnnotationsOpt() : List.nil();
4938 JCExpression qi = qualident(allowAnnos);
4939 if (!typeAnnos.isEmpty()) {
4940 JCExpression at = insertAnnotationsToMostInner(qi, typeAnnos, false);
4941 ts.append(at);
4942 } else {
4943 ts.append(qi);
4944 }
4945 while (token.kind == COMMA) {
4946 nextToken();
4947
4948 typeAnnos = allowAnnos ? typeAnnotationsOpt() : List.nil();
4949 qi = qualident(allowAnnos);
4950 if (!typeAnnos.isEmpty()) {
4951 JCExpression at = insertAnnotationsToMostInner(qi, typeAnnos, false);
4952 ts.append(at);
4953 } else {
4954 ts.append(qi);
4955 }
4956 }
4957 return ts.toList();
4958 }
4959
4960 /**
4961 * {@literal
4962 * TypeParametersOpt = ["<" TypeParameter {"," TypeParameter} ">"]
4963 * }
4964 */
4965 protected List<JCTypeParameter> typeParametersOpt() {
4966 return typeParametersOpt(false);
4967 }
4968 /** Parses a potentially empty type parameter list if needed with `allowEmpty`.
4969 * The caller is free to choose the desirable error message in this (erroneous) case.
4970 */
4971 protected List<JCTypeParameter> typeParametersOpt(boolean parseEmpty) {
4972 if (token.kind == LT) {
4973 ListBuffer<JCTypeParameter> typarams = new ListBuffer<>();
4974 nextToken();
4975
4976 if (parseEmpty && token.kind == GT) {
4977 accept(GT);
4978 return null;
4979 }
4980
4981 typarams.append(typeParameter());
4982 while (token.kind == COMMA) {
4983 nextToken();
4984 typarams.append(typeParameter());
4985 }
4986 accept(GT);
4987 return typarams.toList();
4988 } else {
4989 return List.nil();
4990 }
4991 }
4992
4993 /**
4994 * {@literal
4995 * TypeParameter = [Annotations] TypeVariable [TypeParameterBound]
4996 * TypeParameterBound = EXTENDS Type {"&" Type}
4997 * TypeVariable = Ident
4998 * }
4999 */
5000 JCTypeParameter typeParameter() {
5001 int pos = token.pos;
5002 List<JCAnnotation> annos = typeAnnotationsOpt();
5003 Name name = typeName();
5004 ListBuffer<JCExpression> bounds = new ListBuffer<>();
5005 if (token.kind == EXTENDS) {
5006 nextToken();
5007 bounds.append(parseType());
5008 while (token.kind == AMP) {
5009 nextToken();
5010 bounds.append(parseType());
5011 }
5012 }
5013 return toP(F.at(pos).TypeParameter(name, bounds.toList(), annos));
5014 }
5015
5016 /** FormalParameters = "(" [ FormalParameterList ] ")"
5017 * FormalParameterList = [ FormalParameterListNovarargs , ] LastFormalParameter
5018 * FormalParameterListNovarargs = [ FormalParameterListNovarargs , ] FormalParameter
5019 */
5020 List<JCVariableDecl> formalParameters() {
5021 return formalParameters(false, false);
5022 }
5023 List<JCVariableDecl> formalParameters(boolean lambdaParameters, boolean recordComponents) {
5024 ListBuffer<JCVariableDecl> params = new ListBuffer<>();
5025 JCVariableDecl lastParam;
5026 accept(LPAREN);
5027 if (token.kind != RPAREN) {
5028 this.allowThisIdent = !lambdaParameters && !recordComponents;
5029 lastParam = formalParameter(lambdaParameters, recordComponents);
5030 if (lastParam.nameexpr != null) {
5031 this.receiverParam = lastParam;
5032 } else {
5033 params.append(lastParam);
5034 }
5035 this.allowThisIdent = false;
5036 while (token.kind == COMMA) {
5037 if ((lastParam.mods.flags & Flags.VARARGS) != 0) {
5038 log.error(DiagnosticFlag.SYNTAX, lastParam, Errors.VarargsMustBeLast);
5039 }
5040 nextToken();
5041 params.append(lastParam = formalParameter(lambdaParameters, recordComponents));
5042 }
5043 }
5044 if (token.kind == RPAREN) {
5045 nextToken();
5046 } else {
5047 setErrorEndPos(token.pos);
5048 reportSyntaxError(S.prevToken().endPos, Errors.Expected3(COMMA, RPAREN, LBRACKET));
5049 }
5050 return params.toList();
5051 }
5052
5053 List<JCVariableDecl> implicitParameters(boolean hasParens) {
5054 if (hasParens) {
5055 accept(LPAREN);
5056 }
5057 ListBuffer<JCVariableDecl> params = new ListBuffer<>();
5058 if (token.kind != RPAREN && token.kind != ARROW) {
5059 params.append(implicitParameter());
5060 while (token.kind == COMMA) {
5061 nextToken();
5062 params.append(implicitParameter());
5063 }
5064 }
5065 if (hasParens) {
5066 accept(RPAREN);
5067 }
5068 return params.toList();
5069 }
5070
5071 JCModifiers optFinal(long flags) {
5072 JCModifiers mods = modifiersOpt();
5073 checkNoMods(mods.flags & ~(Flags.FINAL | Flags.DEPRECATED));
5074 mods.flags |= flags;
5075 return mods;
5076 }
5077
5078 /**
5079 * Inserts the annotations (and possibly a new array level)
5080 * to the left-most type in an array or nested type.
5081 *
5082 * When parsing a type like {@code @B Outer.Inner @A []}, the
5083 * {@code @A} annotation should target the array itself, while
5084 * {@code @B} targets the nested type {@code Outer}.
5085 *
5086 * Currently the parser parses the annotation first, then
5087 * the array, and then inserts the annotation to the left-most
5088 * nested type.
5089 *
5090 * When {@code createNewLevel} is true, then a new array
5091 * level is inserted as the most inner type, and have the
5092 * annotations target it. This is useful in the case of
5093 * varargs, e.g. {@code String @A [] @B ...}, as the parser
5094 * first parses the type {@code String @A []} then inserts
5095 * a new array level with {@code @B} annotation.
5096 */
5097 private JCExpression insertAnnotationsToMostInner(
5098 JCExpression type, List<JCAnnotation> annos,
5099 boolean createNewLevel) {
5100 int origEndPos = getEndPos(type);
5101 JCExpression mostInnerType = type;
5102 JCArrayTypeTree mostInnerArrayType = null;
5103 while (TreeInfo.typeIn(mostInnerType).hasTag(TYPEARRAY)) {
5104 mostInnerArrayType = (JCArrayTypeTree) TreeInfo.typeIn(mostInnerType);
5105 mostInnerType = mostInnerArrayType.elemtype;
5106 }
5107
5108 if (createNewLevel) {
5109 mostInnerType = to(F.at(token.pos).TypeArray(mostInnerType));
5110 origEndPos = getEndPos(mostInnerType);
5111 }
5112
5113 JCExpression mostInnerTypeToReturn = mostInnerType;
5114 if (annos.nonEmpty()) {
5115 JCExpression lastToModify = mostInnerType;
5116
5117 while (TreeInfo.typeIn(mostInnerType).hasTag(SELECT) ||
5118 TreeInfo.typeIn(mostInnerType).hasTag(TYPEAPPLY)) {
5119 while (TreeInfo.typeIn(mostInnerType).hasTag(SELECT)) {
5120 lastToModify = mostInnerType;
5121 mostInnerType = ((JCFieldAccess) TreeInfo.typeIn(mostInnerType)).getExpression();
5122 }
5123 while (TreeInfo.typeIn(mostInnerType).hasTag(TYPEAPPLY)) {
5124 lastToModify = mostInnerType;
5125 mostInnerType = ((JCTypeApply) TreeInfo.typeIn(mostInnerType)).clazz;
5126 }
5127 }
5128
5129 mostInnerType = F.at(annos.head.pos).AnnotatedType(annos, mostInnerType);
5130
5131 if (TreeInfo.typeIn(lastToModify).hasTag(TYPEAPPLY)) {
5132 ((JCTypeApply) TreeInfo.typeIn(lastToModify)).clazz = mostInnerType;
5133 } else if (TreeInfo.typeIn(lastToModify).hasTag(SELECT)) {
5134 ((JCFieldAccess) TreeInfo.typeIn(lastToModify)).selected = mostInnerType;
5135 } else {
5136 // We never saw a SELECT or TYPEAPPLY, return the annotated type.
5137 mostInnerTypeToReturn = mostInnerType;
5138 }
5139 }
5140
5141 if (mostInnerArrayType == null) {
5142 return mostInnerTypeToReturn;
5143 } else {
5144 mostInnerArrayType.elemtype = mostInnerTypeToReturn;
5145 storeEnd(type, origEndPos);
5146 return type;
5147 }
5148 }
5149
5150 /** FormalParameter = { FINAL | '@' Annotation } Type VariableDeclaratorId
5151 * LastFormalParameter = { FINAL | '@' Annotation } Type '...' Ident | FormalParameter
5152 */
5153 protected JCVariableDecl formalParameter(boolean lambdaParameter, boolean recordComponent) {
5154 JCModifiers mods = !recordComponent ? optFinal(Flags.PARAMETER) : modifiersOpt();
5155 if (recordComponent && mods.flags != 0) {
5156 log.error(mods.pos, Errors.RecordCantDeclareFieldModifiers);
5157 }
5158 if (recordComponent) {
5159 mods.flags |= Flags.RECORD | Flags.FINAL | Flags.PRIVATE | Flags.GENERATED_MEMBER;
5160 }
5161 // need to distinguish between vararg annos and array annos
5162 // look at typeAnnotationsPushedBack comment
5163 this.permitTypeAnnotationsPushBack = true;
5164 JCExpression type = parseType(lambdaParameter);
5165 this.permitTypeAnnotationsPushBack = false;
5166
5167 if (token.kind == ELLIPSIS) {
5168 List<JCAnnotation> varargsAnnos = typeAnnotationsPushedBack;
5169 typeAnnotationsPushedBack = List.nil();
5170 mods.flags |= Flags.VARARGS;
5171 // insert var arg type annotations
5172 type = insertAnnotationsToMostInner(type, varargsAnnos, true);
5173 nextToken();
5174 } else {
5175 // if not a var arg, then typeAnnotationsPushedBack should be null
5176 if (typeAnnotationsPushedBack.nonEmpty()) {
5177 reportSyntaxError(typeAnnotationsPushedBack.head.pos, Errors.IllegalStartOfType);
5178 }
5179 typeAnnotationsPushedBack = List.nil();
5180 }
5181 return variableDeclaratorId(mods, type, false, lambdaParameter, recordComponent);
5182 }
5183
5184 protected JCVariableDecl implicitParameter() {
5185 JCModifiers mods = F.at(token.pos).Modifiers(Flags.PARAMETER);
5186 return variableDeclaratorId(mods, null, false, true, false);
5187 }
5188
5189 /* ---------- auxiliary methods -------------- */
5190 /** Check that given tree is a legal expression statement.
5191 */
5192 protected JCExpression checkExprStat(JCExpression t) {
5193 if (!TreeInfo.isExpressionStatement(t)) {
5194 JCExpression ret = F.at(t.pos).Erroneous(List.<JCTree>of(t));
5195 log.error(DiagnosticFlag.SYNTAX, ret, Errors.NotStmt);
5196 return ret;
5197 } else {
5198 return t;
5199 }
5200 }
5201
5202 /** Return precedence of operator represented by token,
5203 * -1 if token is not a binary operator. @see TreeInfo.opPrec
5204 */
5205 static int prec(TokenKind token) {
5206 JCTree.Tag oc = optag(token);
5207 return (oc != NO_TAG) ? TreeInfo.opPrec(oc) : -1;
5208 }
5209
5210 /**
5211 * Return the lesser of two positions, making allowance for either one
5212 * being unset.
5213 */
5214 static int earlier(int pos1, int pos2) {
5215 if (pos1 == Position.NOPOS)
5216 return pos2;
5217 if (pos2 == Position.NOPOS)
5218 return pos1;
5219 return (pos1 < pos2 ? pos1 : pos2);
5220 }
5221
5222 /** Return operation tag of binary operator represented by token,
5223 * No_TAG if token is not a binary operator.
5224 */
5225 static JCTree.Tag optag(TokenKind token) {
5226 switch (token) {
5227 case BARBAR:
5228 return OR;
5229 case AMPAMP:
5230 return AND;
5231 case BAR:
5232 return BITOR;
5233 case BAREQ:
5234 return BITOR_ASG;
5235 case CARET:
5236 return BITXOR;
5237 case CARETEQ:
5238 return BITXOR_ASG;
5239 case AMP:
5240 return BITAND;
5241 case AMPEQ:
5242 return BITAND_ASG;
5243 case EQEQ:
5244 return JCTree.Tag.EQ;
5245 case BANGEQ:
5246 return NE;
5247 case LT:
5248 return JCTree.Tag.LT;
5249 case GT:
5250 return JCTree.Tag.GT;
5251 case LTEQ:
5252 return LE;
5253 case GTEQ:
5254 return GE;
5255 case LTLT:
5256 return SL;
5257 case LTLTEQ:
5258 return SL_ASG;
5259 case GTGT:
5260 return SR;
5261 case GTGTEQ:
5262 return SR_ASG;
5263 case GTGTGT:
5264 return USR;
5265 case GTGTGTEQ:
5266 return USR_ASG;
5267 case PLUS:
5268 return JCTree.Tag.PLUS;
5269 case PLUSEQ:
5270 return PLUS_ASG;
5271 case SUB:
5272 return MINUS;
5273 case SUBEQ:
5274 return MINUS_ASG;
5275 case STAR:
5276 return MUL;
5277 case STAREQ:
5278 return MUL_ASG;
5279 case SLASH:
5280 return DIV;
5281 case SLASHEQ:
5282 return DIV_ASG;
5283 case PERCENT:
5284 return MOD;
5285 case PERCENTEQ:
5286 return MOD_ASG;
5287 case INSTANCEOF:
5288 return TYPETEST;
5289 default:
5290 return NO_TAG;
5291 }
5292 }
5293
5294 /** Return operation tag of unary operator represented by token,
5295 * No_TAG if token is not a binary operator.
5296 */
5297 static JCTree.Tag unoptag(TokenKind token) {
5298 switch (token) {
5299 case PLUS:
5300 return POS;
5301 case SUB:
5302 return NEG;
5303 case BANG:
5304 return NOT;
5305 case TILDE:
5306 return COMPL;
5307 case PLUSPLUS:
5308 return PREINC;
5309 case SUBSUB:
5310 return PREDEC;
5311 default:
5312 return NO_TAG;
5313 }
5314 }
5315
5316 /** Return type tag of basic type represented by token,
5317 * NONE if token is not a basic type identifier.
5318 */
5319 static TypeTag typetag(TokenKind token) {
5320 switch (token) {
5321 case BYTE:
5322 return TypeTag.BYTE;
5323 case CHAR:
5324 return TypeTag.CHAR;
5325 case SHORT:
5326 return TypeTag.SHORT;
5327 case INT:
5328 return TypeTag.INT;
5329 case LONG:
5330 return TypeTag.LONG;
5331 case FLOAT:
5332 return TypeTag.FLOAT;
5333 case DOUBLE:
5334 return TypeTag.DOUBLE;
5335 case BOOLEAN:
5336 return TypeTag.BOOLEAN;
5337 default:
5338 return TypeTag.NONE;
5339 }
5340 }
5341
5342 void checkSourceLevel(Feature feature) {
5343 checkSourceLevel(token.pos, feature);
5344 }
5345
5346 protected void checkSourceLevel(int pos, Feature feature) {
5347 if (preview.isPreview(feature) && !preview.isEnabled()) {
5348 //preview feature without --preview flag, error
5349 log.error(DiagnosticFlag.SOURCE_LEVEL, pos, preview.disabledError(feature));
5350 } else if (!feature.allowedInSource(source)) {
5351 //incompatible source level, error
5352 log.error(DiagnosticFlag.SOURCE_LEVEL, pos, feature.error(source.name));
5353 } else if (preview.isPreview(feature)) {
5354 //use of preview feature, warn
5355 preview.warnPreview(pos, feature);
5356 }
5357 }
5358
5359 /*
5360 * a functional source tree and end position mappings
5361 */
5362 protected static class SimpleEndPosTable extends AbstractEndPosTable {
5363
5364 private final IntHashTable endPosMap;
5365
5366 SimpleEndPosTable(JavacParser parser) {
5367 super(parser);
5368 endPosMap = new IntHashTable();
5369 }
5370
5371 public void storeEnd(JCTree tree, int endpos) {
5372 endPosMap.put(tree, errorEndPos > endpos ? errorEndPos : endpos);
5373 }
5374
5375 protected <T extends JCTree> T to(T t) {
5376 storeEnd(t, parser.token.endPos);
5377 return t;
5378 }
5379
5380 protected <T extends JCTree> T toP(T t) {
5381 storeEnd(t, parser.S.prevToken().endPos);
5382 return t;
5383 }
5384
5385 public int getEndPos(JCTree tree) {
5386 int value = endPosMap.get(tree);
5387 // As long as Position.NOPOS==-1, this just returns value.
5388 return (value == -1) ? Position.NOPOS : value;
5389 }
5390
5391 public int replaceTree(JCTree oldTree, JCTree newTree) {
5392 int pos = endPosMap.remove(oldTree);
5393 if (pos != -1) {
5394 storeEnd(newTree, pos);
5395 return pos;
5396 }
5397 return Position.NOPOS;
5398 }
5399 }
5400
5401 /*
5402 * a default skeletal implementation without any mapping overhead.
5403 */
5404 protected static class EmptyEndPosTable extends AbstractEndPosTable {
5405
5406 EmptyEndPosTable(JavacParser parser) {
5407 super(parser);
5408 }
5409
5410 public void storeEnd(JCTree tree, int endpos) { /* empty */ }
5411
5412 protected <T extends JCTree> T to(T t) {
5413 return t;
5414 }
5415
5416 protected <T extends JCTree> T toP(T t) {
5417 return t;
5418 }
5419
5420 public int getEndPos(JCTree tree) {
5421 return Position.NOPOS;
5422 }
5423
5424 public int replaceTree(JCTree oldTree, JCTree newTree) {
5425 return Position.NOPOS;
5426 }
5427
5428 }
5429
5430 protected abstract static class AbstractEndPosTable implements EndPosTable {
5431 /**
5432 * The current parser.
5433 */
5434 protected JavacParser parser;
5435
5436 /**
5437 * Store the last error position.
5438 */
5439 public int errorEndPos = Position.NOPOS;
5440
5441 public AbstractEndPosTable(JavacParser parser) {
5442 this.parser = parser;
5443 }
5444
5445 /**
5446 * Store current token's ending position for a tree, the value of which
5447 * will be the greater of last error position and the ending position of
5448 * the current token.
5449 * @param t The tree.
5450 */
5451 protected abstract <T extends JCTree> T to(T t);
5452
5453 /**
5454 * Store current token's ending position for a tree, the value of which
5455 * will be the greater of last error position and the ending position of
5456 * the previous token.
5457 * @param t The tree.
5458 */
5459 protected abstract <T extends JCTree> T toP(T t);
5460
5461 /**
5462 * Set the error position during the parsing phases, the value of which
5463 * will be set only if it is greater than the last stored error position.
5464 * @param errPos The error position
5465 */
5466 public void setErrorEndPos(int errPos) {
5467 if (errPos > errorEndPos) {
5468 errorEndPos = errPos;
5469 }
5470 }
5471
5472 public void setParser(JavacParser parser) {
5473 this.parser = parser;
5474 }
5475 }
5476 }