1 /*
2 * Copyright (c) 1999, 2018, 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.stream.Collectors;
31
32 import com.sun.source.tree.CaseTree.CaseKind;
33 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
34 import com.sun.source.tree.ModuleTree.ModuleKind;
35
36 import com.sun.tools.javac.code.*;
37 import com.sun.tools.javac.code.Source.Feature;
38 import com.sun.tools.javac.parser.Tokens.*;
39 import com.sun.tools.javac.parser.Tokens.Comment.CommentStyle;
40 import com.sun.tools.javac.resources.CompilerProperties.Errors;
41 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
42 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
43 import com.sun.tools.javac.tree.*;
44 import com.sun.tools.javac.tree.JCTree.*;
45 import com.sun.tools.javac.util.*;
46 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
47 import com.sun.tools.javac.util.JCDiagnostic.Error;
48 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
49 import com.sun.tools.javac.util.List;
50
51 import static com.sun.tools.javac.parser.Tokens.TokenKind.*;
52 import static com.sun.tools.javac.parser.Tokens.TokenKind.ASSERT;
53 import static com.sun.tools.javac.parser.Tokens.TokenKind.CASE;
54 import static com.sun.tools.javac.parser.Tokens.TokenKind.CATCH;
55 import static com.sun.tools.javac.parser.Tokens.TokenKind.EQ;
56 import static com.sun.tools.javac.parser.Tokens.TokenKind.GT;
57 import static com.sun.tools.javac.parser.Tokens.TokenKind.IMPORT;
58 import static com.sun.tools.javac.parser.Tokens.TokenKind.LT;
59 import static com.sun.tools.javac.tree.JCTree.Tag.*;
60 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.ImplicitAndExplicitNotAllowed;
61 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndExplicitNotAllowed;
62 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndImplicitNotAllowed;
63
64 /** The parser maps a token sequence into an abstract syntax
65 * tree. It operates by recursive descent, with code derived
66 * systematically from an LL(1) grammar. For efficiency reasons, an
67 * operator precedence scheme is used for parsing binary operation
68 * expressions.
69 *
70 * <p><b>This is NOT part of any supported API.
71 * If you write code that depends on this, you do so at your own risk.
72 * This code and its internal interfaces are subject to change or
73 * deletion without notice.</b>
74 */
75 public class JavacParser implements Parser {
76
77 /** The number of precedence levels of infix operators.
78 */
79 private static final int infixPrecedenceLevels = 10;
80
81 /** Is the parser instantiated to parse a module-info file ?
82 */
83 private final boolean parseModuleInfo;
84
85 /** The scanner used for lexical analysis.
86 */
87 protected Lexer S;
88
89 /** The factory to be used for abstract syntax tree construction.
90 */
91 protected TreeMaker F;
92
93 /** The log to be used for error diagnostics.
94 */
95 private Log log;
96
97 /** The Source language setting. */
98 private Source source;
99
100 /** The Preview language setting. */
101 private Preview preview;
102
103 /** The name table. */
104 private Names names;
105
106 /** End position mappings container */
107 protected final AbstractEndPosTable endPosTable;
108
109 // Because of javac's limited lookahead, some contexts are ambiguous in
110 // the presence of type annotations even though they are not ambiguous
111 // in the absence of type annotations. Consider this code:
112 // void m(String [] m) { }
113 // void m(String ... m) { }
114 // After parsing "String", javac calls bracketsOpt which immediately
115 // returns if the next character is not '['. Similarly, javac can see
116 // if the next token is ... and in that case parse an ellipsis. But in
117 // the presence of type annotations:
118 // void m(String @A [] m) { }
119 // void m(String @A ... m) { }
120 // no finite lookahead is enough to determine whether to read array
121 // levels or an ellipsis. Furthermore, if you call bracketsOpt, then
122 // bracketsOpt first reads all the leading annotations and only then
123 // discovers that it needs to fail. bracketsOpt needs a way to push
124 // back the extra annotations that it read. (But, bracketsOpt should
125 // not *always* be allowed to push back extra annotations that it finds
126 // -- in most contexts, any such extra annotation is an error.
127 //
128 // The following two variables permit type annotations that have
129 // already been read to be stored for later use. Alternate
130 // implementations are possible but would cause much larger changes to
131 // the parser.
132
133 /** Type annotations that have already been read but have not yet been used. **/
134 private List<JCAnnotation> typeAnnotationsPushedBack = List.nil();
135
136 /**
137 * If the parser notices extra annotations, then it either immediately
138 * issues an error (if this variable is false) or places the extra
139 * annotations in variable typeAnnotationsPushedBack (if this variable
140 * is true).
141 */
142 private boolean permitTypeAnnotationsPushBack = false;
143
144 interface ErrorRecoveryAction {
145 JCTree doRecover(JavacParser parser);
146 }
147
148 enum BasicErrorRecoveryAction implements ErrorRecoveryAction {
149 BLOCK_STMT {public JCTree doRecover(JavacParser parser) { return parser.parseStatementAsBlock(); }},
150 CATCH_CLAUSE {public JCTree doRecover(JavacParser parser) { return parser.catchClause(); }}
151 }
152
153 /** Construct a parser from a given scanner, tree factory and log.
154 */
155 protected JavacParser(ParserFactory fac,
156 Lexer S,
157 boolean keepDocComments,
158 boolean keepLineMap,
159 boolean keepEndPositions) {
160 this(fac, S, keepDocComments, keepLineMap, keepEndPositions, false);
161
162 }
163 /** Construct a parser from a given scanner, tree factory and log.
164 */
165 protected JavacParser(ParserFactory fac,
166 Lexer S,
167 boolean keepDocComments,
168 boolean keepLineMap,
169 boolean keepEndPositions,
170 boolean parseModuleInfo) {
171 this.S = S;
172 nextToken(); // prime the pump
173 this.F = fac.F;
174 this.log = fac.log;
175 this.names = fac.names;
176 this.source = fac.source;
177 this.preview = fac.preview;
178 this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
179 this.keepDocComments = keepDocComments;
180 this.parseModuleInfo = parseModuleInfo;
181 docComments = newDocCommentTable(keepDocComments, fac);
182 this.keepLineMap = keepLineMap;
183 this.errorTree = F.Erroneous();
184 endPosTable = newEndPosTable(keepEndPositions);
185 }
186
187 protected AbstractEndPosTable newEndPosTable(boolean keepEndPositions) {
188 return keepEndPositions
189 ? new SimpleEndPosTable(this)
190 : new EmptyEndPosTable(this);
191 }
192
193 protected DocCommentTable newDocCommentTable(boolean keepDocComments, ParserFactory fac) {
194 return keepDocComments ? new LazyDocCommentTable(fac) : null;
195 }
196
197 /** Switch: should we fold strings?
198 */
199 boolean allowStringFolding;
200
201 /** Switch: should we keep docComments?
202 */
203 boolean keepDocComments;
204
205 /** Switch: should we keep line table?
206 */
207 boolean keepLineMap;
208
209 /** Switch: is "this" allowed as an identifier?
210 * This is needed to parse receiver types.
211 */
212 boolean allowThisIdent;
213
214 /** The type of the method receiver, as specified by a first "this" parameter.
215 */
216 JCVariableDecl receiverParam;
217
218 /** When terms are parsed, the mode determines which is expected:
219 * mode = EXPR : an expression
220 * mode = TYPE : a type
221 * mode = NOPARAMS : no parameters allowed for type
222 * mode = TYPEARG : type argument
223 * mode |= NOLAMBDA : lambdas are not allowed
224 */
225 protected static final int EXPR = 0x1;
226 protected static final int TYPE = 0x2;
227 protected static final int NOPARAMS = 0x4;
228 protected static final int TYPEARG = 0x8;
229 protected static final int DIAMOND = 0x10;
230 protected static final int NOLAMBDA = 0x20;
231
232 protected void selectExprMode() {
233 mode = (mode & NOLAMBDA) | EXPR;
234 }
235
236 protected void selectTypeMode() {
237 mode = (mode & NOLAMBDA) | TYPE;
238 }
239
240 /** The current mode.
241 */
242 protected int mode = 0;
243
244 /** The mode of the term that was parsed last.
245 */
246 protected int lastmode = 0;
247
248 /* ---------- token management -------------- */
249
250 protected Token token;
251
252 public Token token() {
253 return token;
254 }
255
256 public void nextToken() {
257 S.nextToken();
258 token = S.token();
259 }
260
261 protected boolean peekToken(Filter<TokenKind> tk) {
262 return peekToken(0, tk);
263 }
264
265 protected boolean peekToken(int lookahead, Filter<TokenKind> tk) {
266 return tk.accepts(S.token(lookahead + 1).kind);
267 }
268
269 protected boolean peekToken(Filter<TokenKind> tk1, Filter<TokenKind> tk2) {
270 return peekToken(0, tk1, tk2);
271 }
272
273 protected boolean peekToken(int lookahead, Filter<TokenKind> tk1, Filter<TokenKind> tk2) {
274 return tk1.accepts(S.token(lookahead + 1).kind) &&
275 tk2.accepts(S.token(lookahead + 2).kind);
276 }
277
278 protected boolean peekToken(Filter<TokenKind> tk1, Filter<TokenKind> tk2, Filter<TokenKind> tk3) {
279 return peekToken(0, tk1, tk2, tk3);
280 }
281
282 protected boolean peekToken(int lookahead, Filter<TokenKind> tk1, Filter<TokenKind> tk2, Filter<TokenKind> tk3) {
283 return tk1.accepts(S.token(lookahead + 1).kind) &&
284 tk2.accepts(S.token(lookahead + 2).kind) &&
285 tk3.accepts(S.token(lookahead + 3).kind);
286 }
287
288 @SuppressWarnings("unchecked")
289 protected boolean peekToken(Filter<TokenKind>... kinds) {
290 return peekToken(0, kinds);
291 }
292
293 @SuppressWarnings("unchecked")
294 protected boolean peekToken(int lookahead, Filter<TokenKind>... kinds) {
295 for (; lookahead < kinds.length ; lookahead++) {
296 if (!kinds[lookahead].accepts(S.token(lookahead + 1).kind)) {
297 return false;
298 }
299 }
300 return true;
301 }
302
303 /* ---------- error recovery -------------- */
304
305 private JCErroneous errorTree;
306
307 /** Skip forward until a suitable stop token is found.
308 */
309 protected void skip(boolean stopAtImport, boolean stopAtMemberDecl, boolean stopAtIdentifier, boolean stopAtStatement) {
310 while (true) {
311 switch (token.kind) {
312 case SEMI:
313 nextToken();
314 return;
315 case PUBLIC:
316 case FINAL:
317 case ABSTRACT:
318 case MONKEYS_AT:
319 case EOF:
320 case CLASS:
321 case INTERFACE:
322 case ENUM:
323 return;
324 case IMPORT:
325 if (stopAtImport)
326 return;
327 break;
328 case LBRACE:
329 case RBRACE:
330 case PRIVATE:
331 case PROTECTED:
332 case STATIC:
333 case TRANSIENT:
334 case NATIVE:
335 case VOLATILE:
336 case SYNCHRONIZED:
337 case STRICTFP:
338 case LT:
339 case BYTE:
340 case SHORT:
341 case CHAR:
342 case INT:
343 case LONG:
344 case FLOAT:
345 case DOUBLE:
346 case BOOLEAN:
347 case VOID:
348 if (stopAtMemberDecl)
349 return;
350 break;
351 case UNDERSCORE:
352 case IDENTIFIER:
353 if (stopAtIdentifier)
354 return;
355 break;
356 case CASE:
357 case DEFAULT:
358 case IF:
359 case FOR:
360 case WHILE:
361 case DO:
362 case TRY:
363 case SWITCH:
364 case RETURN:
365 case THROW:
366 case BREAK:
367 case CONTINUE:
368 case ELSE:
369 case FINALLY:
370 case CATCH:
371 case THIS:
372 case SUPER:
373 case NEW:
374 if (stopAtStatement)
375 return;
376 break;
377 case ASSERT:
378 if (stopAtStatement)
379 return;
380 break;
381 }
382 nextToken();
383 }
384 }
385
386 protected JCErroneous syntaxError(int pos, Error errorKey) {
387 return syntaxError(pos, List.nil(), errorKey);
388 }
389
390 protected JCErroneous syntaxError(int pos, List<JCTree> errs, Error errorKey) {
391 setErrorEndPos(pos);
392 JCErroneous err = F.at(pos).Erroneous(errs);
393 reportSyntaxError(err, errorKey);
394 if (errs != null) {
395 JCTree last = errs.last();
396 if (last != null)
397 storeEnd(last, pos);
398 }
399 return toP(err);
400 }
401
402 private static final int RECOVERY_THRESHOLD = 50;
403 private int errorPos = Position.NOPOS;
404 private int count = 0;
405
406 /**
407 * Report a syntax using the given the position parameter and arguments,
408 * unless one was already reported at the same position.
409 */
410 protected void reportSyntaxError(int pos, Error errorKey) {
411 JCDiagnostic.DiagnosticPosition diag = new JCDiagnostic.SimpleDiagnosticPosition(pos);
412 reportSyntaxError(diag, errorKey);
413 }
414
415 /**
416 * Report a syntax error using the given DiagnosticPosition object and
417 * arguments, unless one was already reported at the same position.
418 */
419 protected void reportSyntaxError(JCDiagnostic.DiagnosticPosition diagPos, Error errorKey) {
420 int pos = diagPos.getPreferredPosition();
421 if (pos > S.errPos() || pos == Position.NOPOS) {
422 if (token.kind == EOF) {
423 log.error(DiagnosticFlag.SYNTAX, diagPos, Errors.PrematureEof);
424 } else {
425 log.error(DiagnosticFlag.SYNTAX, diagPos, errorKey);
426 }
427 }
428 S.errPos(pos);
429 if (token.pos == errorPos) {
430 //check for a possible infinite loop in parsing:
431 Assert.check(count++ < RECOVERY_THRESHOLD);
432 } else {
433 count = 0;
434 errorPos = token.pos;
435 }
436 }
437
438 /** If next input token matches given token, skip it, otherwise report
439 * an error.
440 */
441 public void accept(TokenKind tk) {
442 accept(tk, Errors::Expected);
443 }
444
445 /** If next input token matches given token, skip it, otherwise report
446 * an error.
447 */
448 public void accept(TokenKind tk, Function<TokenKind, Error> errorProvider) {
449 if (token.kind == tk) {
450 nextToken();
451 } else {
452 setErrorEndPos(token.pos);
453 reportSyntaxError(S.prevToken().endPos, errorProvider.apply(tk));
454 }
455 }
456
457 /** Report an illegal start of expression/type error at given position.
458 */
459 JCExpression illegal(int pos) {
460 setErrorEndPos(pos);
461 if ((mode & EXPR) != 0)
462 return syntaxError(pos, Errors.IllegalStartOfExpr);
463 else
464 return syntaxError(pos, Errors.IllegalStartOfType);
465
466 }
467
468 /** Report an illegal start of expression/type error at current position.
469 */
470 JCExpression illegal() {
471 return illegal(token.pos);
472 }
473
474 /** Diagnose a modifier flag from the set, if any. */
475 protected void checkNoMods(long mods) {
476 if (mods != 0) {
477 long lowestMod = mods & -mods;
478 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.ModNotAllowedHere(Flags.asFlagSet(lowestMod)));
479 }
480 }
481
482 /* ---------- doc comments --------- */
483
484 /** A table to store all documentation comments
485 * indexed by the tree nodes they refer to.
486 * defined only if option flag keepDocComment is set.
487 */
488 private final DocCommentTable docComments;
489
490 /** Make an entry into docComments hashtable,
491 * provided flag keepDocComments is set and given doc comment is non-null.
492 * @param tree The tree to be used as index in the hashtable
493 * @param dc The doc comment to associate with the tree, or null.
494 */
495 protected void attach(JCTree tree, Comment dc) {
496 if (keepDocComments && dc != null) {
497 // System.out.println("doc comment = ");System.out.println(dc);//DEBUG
498 docComments.putComment(tree, dc);
499 }
500 }
501
502 /* -------- source positions ------- */
503
504 protected void setErrorEndPos(int errPos) {
505 endPosTable.setErrorEndPos(errPos);
506 }
507
508 protected void storeEnd(JCTree tree, int endpos) {
509 endPosTable.storeEnd(tree, endpos);
510 }
511
512 protected <T extends JCTree> T to(T t) {
513 return endPosTable.to(t);
514 }
515
516 protected <T extends JCTree> T toP(T t) {
517 return endPosTable.toP(t);
518 }
519
520 /** Get the start position for a tree node. The start position is
521 * defined to be the position of the first character of the first
522 * token of the node's source text.
523 * @param tree The tree node
524 */
525 public int getStartPos(JCTree tree) {
526 return TreeInfo.getStartPos(tree);
527 }
528
529 /**
530 * Get the end position for a tree node. The end position is
531 * defined to be the position of the last character of the last
532 * token of the node's source text. Returns Position.NOPOS if end
533 * positions are not generated or the position is otherwise not
534 * found.
535 * @param tree The tree node
536 */
537 public int getEndPos(JCTree tree) {
538 return endPosTable.getEndPos(tree);
539 }
540
541
542
543 /* ---------- parsing -------------- */
544
545 /**
546 * Ident = IDENTIFIER
547 */
548 public Name ident() {
549 return ident(false);
550 }
551
552 protected Name ident(boolean advanceOnErrors) {
553 if (token.kind == IDENTIFIER) {
554 Name name = token.name();
555 nextToken();
556 return name;
557 } else if (token.kind == ASSERT) {
558 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.AssertAsIdentifier);
559 nextToken();
560 return names.error;
561 } else if (token.kind == ENUM) {
562 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.EnumAsIdentifier);
563 nextToken();
564 return names.error;
565 } else if (token.kind == THIS) {
566 if (allowThisIdent) {
567 // Make sure we're using a supported source version.
568 checkSourceLevel(Feature.TYPE_ANNOTATIONS);
569 Name name = token.name();
570 nextToken();
571 return name;
572 } else {
573 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.ThisAsIdentifier);
574 nextToken();
575 return names.error;
576 }
577 } else if (token.kind == UNDERSCORE) {
578 if (Feature.UNDERSCORE_IDENTIFIER.allowedInSource(source)) {
579 log.warning(token.pos, Warnings.UnderscoreAsIdentifier);
580 } else {
581 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.UnderscoreAsIdentifier);
582 }
583 Name name = token.name();
584 nextToken();
585 return name;
586 } else {
587 accept(IDENTIFIER);
588 if (advanceOnErrors) {
589 nextToken();
590 }
591 return names.error;
592 }
593 }
594
595 /**
596 * Qualident = Ident { DOT [Annotations] Ident }
597 */
598 public JCExpression qualident(boolean allowAnnos) {
599 JCExpression t = toP(F.at(token.pos).Ident(ident()));
600 while (token.kind == DOT) {
601 int pos = token.pos;
602 nextToken();
603 List<JCAnnotation> tyannos = null;
604 if (allowAnnos) {
605 tyannos = typeAnnotationsOpt();
606 }
607 t = toP(F.at(pos).Select(t, ident()));
608 if (tyannos != null && tyannos.nonEmpty()) {
609 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
610 }
611 }
612 return t;
613 }
614
615 JCExpression literal(Name prefix) {
616 return literal(prefix, token.pos);
617 }
618
619 /**
620 * Literal =
621 * INTLITERAL
622 * | LONGLITERAL
623 * | FLOATLITERAL
624 * | DOUBLELITERAL
625 * | CHARLITERAL
626 * | STRINGLITERAL
627 * | TRUE
628 * | FALSE
629 * | NULL
630 */
631 JCExpression literal(Name prefix, int pos) {
632 JCExpression t = errorTree;
633 switch (token.kind) {
634 case INTLITERAL:
635 try {
636 t = F.at(pos).Literal(
637 TypeTag.INT,
638 Convert.string2int(strval(prefix), token.radix()));
639 } catch (NumberFormatException ex) {
640 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.IntNumberTooLarge(strval(prefix)));
641 }
642 break;
643 case LONGLITERAL:
644 try {
645 t = F.at(pos).Literal(
646 TypeTag.LONG,
647 Long.valueOf(Convert.string2long(strval(prefix), token.radix())));
648 } catch (NumberFormatException ex) {
649 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.IntNumberTooLarge(strval(prefix)));
650 }
651 break;
652 case FLOATLITERAL: {
653 String proper = token.radix() == 16 ?
654 ("0x"+ token.stringVal()) :
655 token.stringVal();
656 Float n;
657 try {
658 n = Float.valueOf(proper);
659 } catch (NumberFormatException ex) {
660 // error already reported in scanner
661 n = Float.NaN;
662 }
663 if (n.floatValue() == 0.0f && !isZero(proper))
664 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooSmall);
665 else if (n.floatValue() == Float.POSITIVE_INFINITY)
666 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooLarge);
667 else
668 t = F.at(pos).Literal(TypeTag.FLOAT, n);
669 break;
670 }
671 case DOUBLELITERAL: {
672 String proper = token.radix() == 16 ?
673 ("0x"+ token.stringVal()) :
674 token.stringVal();
675 Double n;
676 try {
677 n = Double.valueOf(proper);
678 } catch (NumberFormatException ex) {
679 // error already reported in scanner
680 n = Double.NaN;
681 }
682 if (n.doubleValue() == 0.0d && !isZero(proper))
683 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooSmall);
684 else if (n.doubleValue() == Double.POSITIVE_INFINITY)
685 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.FpNumberTooLarge);
686 else
687 t = F.at(pos).Literal(TypeTag.DOUBLE, n);
688 break;
689 }
690 case CHARLITERAL:
691 t = F.at(pos).Literal(
692 TypeTag.CHAR,
693 token.stringVal().charAt(0) + 0);
694 break;
695 case STRINGLITERAL:
696 t = F.at(pos).Literal(
697 TypeTag.CLASS,
698 token.stringVal());
699 break;
700 case TRUE: case FALSE:
701 t = F.at(pos).Literal(
702 TypeTag.BOOLEAN,
703 (token.kind == TRUE ? 1 : 0));
704 break;
705 case NULL:
706 t = F.at(pos).Literal(
707 TypeTag.BOT,
708 null);
709 break;
710 default:
711 Assert.error();
712 }
713 if (t == errorTree)
714 t = F.at(pos).Erroneous();
715 storeEnd(t, token.endPos);
716 nextToken();
717 return t;
718 }
719 //where
720 boolean isZero(String s) {
721 char[] cs = s.toCharArray();
722 int base = ((cs.length > 1 && Character.toLowerCase(cs[1]) == 'x') ? 16 : 10);
723 int i = ((base==16) ? 2 : 0);
724 while (i < cs.length && (cs[i] == '0' || cs[i] == '.')) i++;
725 return !(i < cs.length && (Character.digit(cs[i], base) > 0));
726 }
727
728 String strval(Name prefix) {
729 String s = token.stringVal();
730 return prefix.isEmpty() ? s : prefix + s;
731 }
732
733 /** terms can be either expressions or types.
734 */
735 public JCExpression parseExpression() {
736 return term(EXPR);
737 }
738
739 /**
740 * parses (optional) type annotations followed by a type. If the
741 * annotations are present before the type and are not consumed during array
742 * parsing, this method returns a {@link JCAnnotatedType} consisting of
743 * these annotations and the underlying type. Otherwise, it returns the
744 * underlying type.
745 *
746 * <p>
747 *
748 * Note that this method sets {@code mode} to {@code TYPE} first, before
749 * parsing annotations.
750 */
751 public JCExpression parseType() {
752 return parseType(false);
753 }
754
755 public JCExpression parseType(boolean allowVar) {
756 List<JCAnnotation> annotations = typeAnnotationsOpt();
757 return parseType(allowVar, annotations);
758 }
759
760 public JCExpression parseType(boolean allowVar, List<JCAnnotation> annotations) {
761 JCExpression result = unannotatedType(allowVar);
762
763 if (annotations.nonEmpty()) {
764 result = insertAnnotationsToMostInner(result, annotations, false);
765 }
766
767 return result;
768 }
769
770 public JCExpression unannotatedType(boolean allowVar) {
771 JCExpression result = term(TYPE);
772
773 if (!allowVar && isRestrictedLocalVarTypeName(result, true)) {
774 syntaxError(result.pos, Errors.VarNotAllowedHere);
775 }
776
777 return result;
778 }
779
780
781
782 protected JCExpression term(int newmode) {
783 int prevmode = mode;
784 mode = newmode;
785 JCExpression t = term();
786 lastmode = mode;
787 mode = prevmode;
788 return t;
789 }
790
791 /**
792 * {@literal
793 * Expression = Expression1 [ExpressionRest]
794 * ExpressionRest = [AssignmentOperator Expression1]
795 * AssignmentOperator = "=" | "+=" | "-=" | "*=" | "/=" |
796 * "&=" | "|=" | "^=" |
797 * "%=" | "<<=" | ">>=" | ">>>="
798 * Type = Type1
799 * TypeNoParams = TypeNoParams1
800 * StatementExpression = Expression
801 * ConstantExpression = Expression
802 * }
803 */
804 JCExpression term() {
805 JCExpression t = term1();
806 if ((mode & EXPR) != 0 &&
807 token.kind == EQ || PLUSEQ.compareTo(token.kind) <= 0 && token.kind.compareTo(GTGTGTEQ) <= 0)
808 return termRest(t);
809 else
810 return t;
811 }
812
813 JCExpression termRest(JCExpression t) {
814 switch (token.kind) {
815 case EQ: {
816 int pos = token.pos;
817 nextToken();
818 selectExprMode();
819 JCExpression t1 = term();
820 return toP(F.at(pos).Assign(t, t1));
821 }
822 case PLUSEQ:
823 case SUBEQ:
824 case STAREQ:
825 case SLASHEQ:
826 case PERCENTEQ:
827 case AMPEQ:
828 case BAREQ:
829 case CARETEQ:
830 case LTLTEQ:
831 case GTGTEQ:
832 case GTGTGTEQ:
833 int pos = token.pos;
834 TokenKind tk = token.kind;
835 nextToken();
836 selectExprMode();
837 JCExpression t1 = term();
838 return F.at(pos).Assignop(optag(tk), t, t1);
839 default:
840 return t;
841 }
842 }
843
844 /** Expression1 = Expression2 [Expression1Rest]
845 * Type1 = Type2
846 * TypeNoParams1 = TypeNoParams2
847 */
848 JCExpression term1() {
849 JCExpression t = term2();
850 if ((mode & EXPR) != 0 && token.kind == QUES) {
851 selectExprMode();
852 return term1Rest(t);
853 } else {
854 return t;
855 }
856 }
857
858 /** Expression1Rest = ["?" Expression ":" Expression1]
859 */
860 JCExpression term1Rest(JCExpression t) {
861 if (token.kind == QUES) {
862 int pos = token.pos;
863 nextToken();
864 JCExpression t1 = term();
865 accept(COLON);
866 JCExpression t2 = term1();
867 return F.at(pos).Conditional(t, t1, t2);
868 } else {
869 return t;
870 }
871 }
872
873 /** Expression2 = Expression3 [Expression2Rest]
874 * Type2 = Type3
875 * TypeNoParams2 = TypeNoParams3
876 */
877 JCExpression term2() {
878 JCExpression t = term3();
879 if ((mode & EXPR) != 0 && prec(token.kind) >= TreeInfo.orPrec) {
880 selectExprMode();
881 return term2Rest(t, TreeInfo.orPrec);
882 } else {
883 return t;
884 }
885 }
886
887 /* Expression2Rest = {infixop Expression3}
888 * | Expression3 instanceof Type
889 * infixop = "||"
890 * | "&&"
891 * | "|"
892 * | "^"
893 * | "&"
894 * | "==" | "!="
895 * | "<" | ">" | "<=" | ">="
896 * | "<<" | ">>" | ">>>"
897 * | "+" | "-"
898 * | "*" | "/" | "%"
899 */
900 JCExpression term2Rest(JCExpression t, int minprec) {
901 JCExpression[] odStack = newOdStack();
902 Token[] opStack = newOpStack();
903
904 // optimization, was odStack = new Tree[...]; opStack = new Tree[...];
905 int top = 0;
906 odStack[0] = t;
907 int startPos = token.pos;
908 Token topOp = Tokens.DUMMY;
909 while (prec(token.kind) >= minprec) {
910 opStack[top] = topOp;
911 top++;
912 topOp = token;
913 nextToken();
914 odStack[top] = (topOp.kind == INSTANCEOF) ? parseType() : term3();
915 while (top > 0 && prec(topOp.kind) >= prec(token.kind)) {
916 odStack[top-1] = makeOp(topOp.pos, topOp.kind, odStack[top-1],
917 odStack[top]);
918 top--;
919 topOp = opStack[top];
920 }
921 }
922 Assert.check(top == 0);
923 t = odStack[0];
924
925 if (t.hasTag(JCTree.Tag.PLUS)) {
926 t = foldStrings(t);
927 }
928
929 odStackSupply.add(odStack);
930 opStackSupply.add(opStack);
931 return t;
932 }
933 //where
934 /** Construct a binary or type test node.
935 */
936 private JCExpression makeOp(int pos,
937 TokenKind topOp,
938 JCExpression od1,
939 JCExpression od2)
940 {
941 if (topOp == INSTANCEOF) {
942 return F.at(pos).TypeTest(od1, od2);
943 } else {
944 return F.at(pos).Binary(optag(topOp), od1, od2);
945 }
946 }
947 /** If tree is a concatenation of string literals, replace it
948 * by a single literal representing the concatenated string.
949 */
950 protected JCExpression foldStrings(JCExpression tree) {
951 if (!allowStringFolding)
952 return tree;
953 ListBuffer<JCExpression> opStack = new ListBuffer<>();
954 ListBuffer<JCLiteral> litBuf = new ListBuffer<>();
955 boolean needsFolding = false;
956 JCExpression curr = tree;
957 while (true) {
958 if (curr.hasTag(JCTree.Tag.PLUS)) {
959 JCBinary op = (JCBinary)curr;
960 needsFolding |= foldIfNeeded(op.rhs, litBuf, opStack, false);
961 curr = op.lhs;
962 } else {
963 needsFolding |= foldIfNeeded(curr, litBuf, opStack, true);
964 break; //last one!
965 }
966 }
967 if (needsFolding) {
968 List<JCExpression> ops = opStack.toList();
969 JCExpression res = ops.head;
970 for (JCExpression op : ops.tail) {
971 res = F.at(op.getStartPosition()).Binary(optag(TokenKind.PLUS), res, op);
972 storeEnd(res, getEndPos(op));
973 }
974 return res;
975 } else {
976 return tree;
977 }
978 }
979
980 private boolean foldIfNeeded(JCExpression tree, ListBuffer<JCLiteral> litBuf,
981 ListBuffer<JCExpression> opStack, boolean last) {
982 JCLiteral str = stringLiteral(tree);
983 if (str != null) {
984 litBuf.prepend(str);
985 return last && merge(litBuf, opStack);
986 } else {
987 boolean res = merge(litBuf, opStack);
988 litBuf.clear();
989 opStack.prepend(tree);
990 return res;
991 }
992 }
993
994 boolean merge(ListBuffer<JCLiteral> litBuf, ListBuffer<JCExpression> opStack) {
995 if (litBuf.isEmpty()) {
996 return false;
997 } else if (litBuf.size() == 1) {
998 opStack.prepend(litBuf.first());
999 return false;
1000 } else {
1001 JCExpression t = F.at(litBuf.first().getStartPosition()).Literal(TypeTag.CLASS,
1002 litBuf.stream().map(lit -> (String)lit.getValue()).collect(Collectors.joining()));
1003 storeEnd(t, litBuf.last().getEndPosition(endPosTable));
1004 opStack.prepend(t);
1005 return true;
1006 }
1007 }
1008
1009 private JCLiteral stringLiteral(JCTree tree) {
1010 if (tree.hasTag(LITERAL)) {
1011 JCLiteral lit = (JCLiteral)tree;
1012 if (lit.typetag == TypeTag.CLASS) {
1013 return lit;
1014 }
1015 }
1016 return null;
1017 }
1018
1019
1020 /** optimization: To save allocating a new operand/operator stack
1021 * for every binary operation, we use supplys.
1022 */
1023 ArrayList<JCExpression[]> odStackSupply = new ArrayList<>();
1024 ArrayList<Token[]> opStackSupply = new ArrayList<>();
1025
1026 private JCExpression[] newOdStack() {
1027 if (odStackSupply.isEmpty())
1028 return new JCExpression[infixPrecedenceLevels + 1];
1029 return odStackSupply.remove(odStackSupply.size() - 1);
1030 }
1031
1032 private Token[] newOpStack() {
1033 if (opStackSupply.isEmpty())
1034 return new Token[infixPrecedenceLevels + 1];
1035 return opStackSupply.remove(opStackSupply.size() - 1);
1036 }
1037
1038 /**
1039 * Expression3 = PrefixOp Expression3
1040 * | "(" Expr | TypeNoParams ")" Expression3
1041 * | Primary {Selector} {PostfixOp}
1042 *
1043 * {@literal
1044 * Primary = "(" Expression ")"
1045 * | Literal
1046 * | [TypeArguments] THIS [Arguments]
1047 * | [TypeArguments] SUPER SuperSuffix
1048 * | NEW [TypeArguments] Creator
1049 * | "(" Arguments ")" "->" ( Expression | Block )
1050 * | Ident "->" ( Expression | Block )
1051 * | [Annotations] Ident { "." [Annotations] Ident }
1052 * | Expression3 MemberReferenceSuffix
1053 * [ [Annotations] "[" ( "]" BracketsOpt "." CLASS | Expression "]" )
1054 * | Arguments
1055 * | "." ( CLASS | THIS | [TypeArguments] SUPER Arguments | NEW [TypeArguments] InnerCreator )
1056 * ]
1057 * | BasicType BracketsOpt "." CLASS
1058 * }
1059 *
1060 * PrefixOp = "++" | "--" | "!" | "~" | "+" | "-"
1061 * PostfixOp = "++" | "--"
1062 * Type3 = Ident { "." Ident } [TypeArguments] {TypeSelector} BracketsOpt
1063 * | BasicType
1064 * TypeNoParams3 = Ident { "." Ident } BracketsOpt
1065 * Selector = "." [TypeArguments] Ident [Arguments]
1066 * | "." THIS
1067 * | "." [TypeArguments] SUPER SuperSuffix
1068 * | "." NEW [TypeArguments] InnerCreator
1069 * | "[" Expression "]"
1070 * TypeSelector = "." Ident [TypeArguments]
1071 * SuperSuffix = Arguments | "." Ident [Arguments]
1072 */
1073 protected JCExpression term3() {
1074 int pos = token.pos;
1075 JCExpression t;
1076 List<JCExpression> typeArgs = typeArgumentsOpt(EXPR);
1077 switch (token.kind) {
1078 case QUES:
1079 if ((mode & TYPE) != 0 && (mode & (TYPEARG|NOPARAMS)) == TYPEARG) {
1080 selectTypeMode();
1081 return typeArgument();
1082 } else
1083 return illegal();
1084 case PLUSPLUS: case SUBSUB: case BANG: case TILDE: case PLUS: case SUB:
1085 if (typeArgs == null && (mode & EXPR) != 0) {
1086 TokenKind tk = token.kind;
1087 nextToken();
1088 selectExprMode();
1089 if (tk == SUB &&
1090 (token.kind == INTLITERAL || token.kind == LONGLITERAL) &&
1091 token.radix() == 10) {
1092 selectExprMode();
1093 t = literal(names.hyphen, pos);
1094 } else {
1095 t = term3();
1096 return F.at(pos).Unary(unoptag(tk), t);
1097 }
1098 } else return illegal();
1099 break;
1100 case LPAREN:
1101 if (typeArgs == null && (mode & EXPR) != 0) {
1102 ParensResult pres = analyzeParens();
1103 switch (pres) {
1104 case CAST:
1105 accept(LPAREN);
1106 selectTypeMode();
1107 int pos1 = pos;
1108 List<JCExpression> targets = List.of(t = parseType());
1109 while (token.kind == AMP) {
1110 checkSourceLevel(Feature.INTERSECTION_TYPES_IN_CAST);
1111 accept(AMP);
1112 targets = targets.prepend(parseType());
1113 }
1114 if (targets.length() > 1) {
1115 t = toP(F.at(pos1).TypeIntersection(targets.reverse()));
1116 }
1117 accept(RPAREN);
1118 selectExprMode();
1119 JCExpression t1 = term3();
1120 return F.at(pos).TypeCast(t, t1);
1121 case IMPLICIT_LAMBDA:
1122 case EXPLICIT_LAMBDA:
1123 t = lambdaExpressionOrStatement(true, pres == ParensResult.EXPLICIT_LAMBDA, pos);
1124 break;
1125 default: //PARENS
1126 accept(LPAREN);
1127 selectExprMode();
1128 t = termRest(term1Rest(term2Rest(term3(), TreeInfo.orPrec)));
1129 accept(RPAREN);
1130 t = toP(F.at(pos).Parens(t));
1131 break;
1132 }
1133 } else {
1134 return illegal();
1135 }
1136 break;
1137 case THIS:
1138 if ((mode & EXPR) != 0) {
1139 selectExprMode();
1140 t = to(F.at(pos).Ident(names._this));
1141 nextToken();
1142 if (typeArgs == null)
1143 t = argumentsOpt(null, t);
1144 else
1145 t = arguments(typeArgs, t);
1146 typeArgs = null;
1147 } else return illegal();
1148 break;
1149 case SUPER:
1150 if ((mode & EXPR) != 0) {
1151 selectExprMode();
1152 t = to(F.at(pos).Ident(names._super));
1153 t = superSuffix(typeArgs, t);
1154 typeArgs = null;
1155 } else return illegal();
1156 break;
1157 case INTLITERAL: case LONGLITERAL: case FLOATLITERAL: case DOUBLELITERAL:
1158 case CHARLITERAL: case STRINGLITERAL:
1159 case TRUE: case FALSE: case NULL:
1160 if (typeArgs == null && (mode & EXPR) != 0) {
1161 selectExprMode();
1162 t = literal(names.empty);
1163 } else return illegal();
1164 break;
1165 case NEW:
1166 if (typeArgs != null) return illegal();
1167 if ((mode & EXPR) != 0) {
1168 selectExprMode();
1169 nextToken();
1170 if (token.kind == LT) typeArgs = typeArguments(false);
1171 t = creator(pos, typeArgs);
1172 typeArgs = null;
1173 } else return illegal();
1174 break;
1175 case MONKEYS_AT:
1176 // Only annotated cast types and method references are valid
1177 List<JCAnnotation> typeAnnos = typeAnnotationsOpt();
1178 if (typeAnnos.isEmpty()) {
1179 // else there would be no '@'
1180 throw new AssertionError("Expected type annotations, but found none!");
1181 }
1182
1183 JCExpression expr = term3();
1184
1185 if ((mode & TYPE) == 0) {
1186 // Type annotations on class literals no longer legal
1187 switch (expr.getTag()) {
1188 case REFERENCE: {
1189 JCMemberReference mref = (JCMemberReference) expr;
1190 mref.expr = toP(F.at(pos).AnnotatedType(typeAnnos, mref.expr));
1191 t = mref;
1192 break;
1193 }
1194 case SELECT: {
1195 JCFieldAccess sel = (JCFieldAccess) expr;
1196
1197 if (sel.name != names._class) {
1198 return illegal();
1199 } else {
1200 log.error(token.pos, Errors.NoAnnotationsOnDotClass);
1201 return expr;
1202 }
1203 }
1204 default:
1205 return illegal(typeAnnos.head.pos);
1206 }
1207
1208 } else {
1209 // Type annotations targeting a cast
1210 t = insertAnnotationsToMostInner(expr, typeAnnos, false);
1211 }
1212 break;
1213 case UNDERSCORE: case IDENTIFIER: case ASSERT: case ENUM:
1214 if (typeArgs != null) return illegal();
1215 if ((mode & EXPR) != 0 && (mode & NOLAMBDA) == 0 && peekToken(ARROW)) {
1216 t = lambdaExpressionOrStatement(false, false, pos);
1217 } else {
1218 t = toP(F.at(token.pos).Ident(ident()));
1219 loop: while (true) {
1220 pos = token.pos;
1221 final List<JCAnnotation> annos = typeAnnotationsOpt();
1222
1223 // need to report an error later if LBRACKET is for array
1224 // index access rather than array creation level
1225 if (!annos.isEmpty() && token.kind != LBRACKET && token.kind != ELLIPSIS)
1226 return illegal(annos.head.pos);
1227
1228 switch (token.kind) {
1229 case LBRACKET:
1230 nextToken();
1231 if (token.kind == RBRACKET) {
1232 nextToken();
1233 t = bracketsOpt(t);
1234 t = toP(F.at(pos).TypeArray(t));
1235 if (annos.nonEmpty()) {
1236 t = toP(F.at(pos).AnnotatedType(annos, t));
1237 }
1238 t = bracketsSuffix(t);
1239 } else {
1240 if ((mode & EXPR) != 0) {
1241 selectExprMode();
1242 JCExpression t1 = term();
1243 if (!annos.isEmpty()) t = illegal(annos.head.pos);
1244 t = to(F.at(pos).Indexed(t, t1));
1245 }
1246 accept(RBRACKET);
1247 }
1248 break loop;
1249 case LPAREN:
1250 if ((mode & EXPR) != 0) {
1251 selectExprMode();
1252 t = arguments(typeArgs, t);
1253 if (!annos.isEmpty()) t = illegal(annos.head.pos);
1254 typeArgs = null;
1255 }
1256 break loop;
1257 case DOT:
1258 nextToken();
1259 if (token.kind == TokenKind.IDENTIFIER && typeArgs != null) {
1260 return illegal();
1261 }
1262 int oldmode = mode;
1263 mode &= ~NOPARAMS;
1264 typeArgs = typeArgumentsOpt(EXPR);
1265 mode = oldmode;
1266 if ((mode & EXPR) != 0) {
1267 switch (token.kind) {
1268 case CLASS:
1269 if (typeArgs != null) return illegal();
1270 selectExprMode();
1271 t = to(F.at(pos).Select(t, names._class));
1272 nextToken();
1273 break loop;
1274 case THIS:
1275 if (typeArgs != null) return illegal();
1276 selectExprMode();
1277 t = to(F.at(pos).Select(t, names._this));
1278 nextToken();
1279 break loop;
1280 case SUPER:
1281 selectExprMode();
1282 t = to(F.at(pos).Select(t, names._super));
1283 t = superSuffix(typeArgs, t);
1284 typeArgs = null;
1285 break loop;
1286 case NEW:
1287 if (typeArgs != null) return illegal();
1288 selectExprMode();
1289 int pos1 = token.pos;
1290 nextToken();
1291 if (token.kind == LT) typeArgs = typeArguments(false);
1292 t = innerCreator(pos1, typeArgs, t);
1293 typeArgs = null;
1294 break loop;
1295 }
1296 }
1297
1298 List<JCAnnotation> tyannos = null;
1299 if ((mode & TYPE) != 0 && token.kind == MONKEYS_AT) {
1300 tyannos = typeAnnotationsOpt();
1301 }
1302 // typeArgs saved for next loop iteration.
1303 t = toP(F.at(pos).Select(t, ident()));
1304 if (tyannos != null && tyannos.nonEmpty()) {
1305 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1306 }
1307 break;
1308 case ELLIPSIS:
1309 if (this.permitTypeAnnotationsPushBack) {
1310 this.typeAnnotationsPushedBack = annos;
1311 } else if (annos.nonEmpty()) {
1312 // Don't return here -- error recovery attempt
1313 illegal(annos.head.pos);
1314 }
1315 break loop;
1316 case LT:
1317 if ((mode & TYPE) == 0 && isUnboundMemberRef()) {
1318 //this is an unbound method reference whose qualifier
1319 //is a generic type i.e. A<S>::m
1320 int pos1 = token.pos;
1321 accept(LT);
1322 ListBuffer<JCExpression> args = new ListBuffer<>();
1323 args.append(typeArgument());
1324 while (token.kind == COMMA) {
1325 nextToken();
1326 args.append(typeArgument());
1327 }
1328 accept(GT);
1329 t = toP(F.at(pos1).TypeApply(t, args.toList()));
1330 while (token.kind == DOT) {
1331 nextToken();
1332 selectTypeMode();
1333 t = toP(F.at(token.pos).Select(t, ident()));
1334 t = typeArgumentsOpt(t);
1335 }
1336 t = bracketsOpt(t);
1337 if (token.kind != COLCOL) {
1338 //method reference expected here
1339 t = illegal();
1340 }
1341 selectExprMode();
1342 return term3Rest(t, typeArgs);
1343 }
1344 break loop;
1345 default:
1346 break loop;
1347 }
1348 }
1349 }
1350 if (typeArgs != null) illegal();
1351 t = typeArgumentsOpt(t);
1352 break;
1353 case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
1354 case DOUBLE: case BOOLEAN:
1355 if (typeArgs != null) illegal();
1356 t = bracketsSuffix(bracketsOpt(basicType()));
1357 break;
1358 case VOID:
1359 if (typeArgs != null) illegal();
1360 if ((mode & EXPR) != 0) {
1361 nextToken();
1362 if (token.kind == DOT) {
1363 JCPrimitiveTypeTree ti = toP(F.at(pos).TypeIdent(TypeTag.VOID));
1364 t = bracketsSuffix(ti);
1365 } else {
1366 return illegal(pos);
1367 }
1368 } else {
1369 // Support the corner case of myMethodHandle.<void>invoke() by passing
1370 // a void type (like other primitive types) to the next phase.
1371 // The error will be reported in Attr.attribTypes or Attr.visitApply.
1372 JCPrimitiveTypeTree ti = to(F.at(pos).TypeIdent(TypeTag.VOID));
1373 nextToken();
1374 return ti;
1375 //return illegal();
1376 }
1377 break;
1378 case SWITCH:
1379 checkSourceLevel(Feature.SWITCH_EXPRESSION);
1380 int switchPos = token.pos;
1381 nextToken();
1382 JCExpression selector = parExpression();
1383 accept(LBRACE);
1384 ListBuffer<JCCase> cases = new ListBuffer<>();
1385 while (true) {
1386 pos = token.pos;
1387 switch (token.kind) {
1388 case CASE:
1389 case DEFAULT:
1390 cases.appendList(switchExpressionStatementGroup());
1391 break;
1392 case RBRACE: case EOF:
1393 JCSwitchExpression e = to(F.at(switchPos).SwitchExpression(selector,
1394 cases.toList()));
1395 e.endpos = token.pos;
1396 accept(RBRACE);
1397 return e;
1398 default:
1399 nextToken(); // to ensure progress
1400 syntaxError(pos, Errors.Expected3(CASE, DEFAULT, RBRACE));
1401 }
1402 }
1403 default:
1404 return illegal();
1405 }
1406 return term3Rest(t, typeArgs);
1407 }
1408
1409 private List<JCCase> switchExpressionStatementGroup() {
1410 ListBuffer<JCCase> caseExprs = new ListBuffer<>();
1411 int casePos = token.pos;
1412 ListBuffer<JCExpression> pats = new ListBuffer<>();
1413
1414 if (token.kind == DEFAULT) {
1415 nextToken();
1416 } else {
1417 accept(CASE);
1418 while (true) {
1419 pats.append(term(EXPR | NOLAMBDA));
1420 if (token.kind != COMMA) break;
1421 checkSourceLevel(Feature.SWITCH_MULTIPLE_CASE_LABELS);
1422 nextToken();
1423 };
1424 }
1425 List<JCStatement> stats = null;
1426 JCTree body = null;
1427 @SuppressWarnings("removal")
1428 CaseKind kind;
1429 switch (token.kind) {
1430 case ARROW:
1431 checkSourceLevel(Feature.SWITCH_RULE);
1432 nextToken();
1433 if (token.kind == TokenKind.THROW || token.kind == TokenKind.LBRACE) {
1434 stats = List.of(parseStatement());
1435 body = stats.head;
1436 kind = JCCase.RULE;
1437 } else {
1438 JCExpression value = parseExpression();
1439 stats = List.of(to(F.at(value).Break(value)));
1440 body = value;
1441 kind = JCCase.RULE;
1442 accept(SEMI);
1443 }
1444 break;
1445 default:
1446 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
1447 stats = blockStatements();
1448 kind = JCCase.STATEMENT;
1449 break;
1450 }
1451 caseExprs.append(toP(F.at(casePos).Case(kind, pats.toList(), stats, body)));
1452 return caseExprs.toList();
1453 }
1454
1455 JCExpression term3Rest(JCExpression t, List<JCExpression> typeArgs) {
1456 if (typeArgs != null) illegal();
1457 while (true) {
1458 int pos1 = token.pos;
1459 final List<JCAnnotation> annos = typeAnnotationsOpt();
1460
1461 if (token.kind == LBRACKET) {
1462 nextToken();
1463 if ((mode & TYPE) != 0) {
1464 int oldmode = mode;
1465 selectTypeMode();
1466 if (token.kind == RBRACKET) {
1467 nextToken();
1468 t = bracketsOpt(t);
1469 t = toP(F.at(pos1).TypeArray(t));
1470 if (token.kind == COLCOL) {
1471 selectExprMode();
1472 continue;
1473 }
1474 if (annos.nonEmpty()) {
1475 t = toP(F.at(pos1).AnnotatedType(annos, t));
1476 }
1477 return t;
1478 }
1479 mode = oldmode;
1480 }
1481 if ((mode & EXPR) != 0) {
1482 selectExprMode();
1483 JCExpression t1 = term();
1484 t = to(F.at(pos1).Indexed(t, t1));
1485 }
1486 accept(RBRACKET);
1487 } else if (token.kind == DOT) {
1488 nextToken();
1489 typeArgs = typeArgumentsOpt(EXPR);
1490 if (token.kind == SUPER && (mode & EXPR) != 0) {
1491 selectExprMode();
1492 t = to(F.at(pos1).Select(t, names._super));
1493 nextToken();
1494 t = arguments(typeArgs, t);
1495 typeArgs = null;
1496 } else if (token.kind == NEW && (mode & EXPR) != 0) {
1497 if (typeArgs != null) return illegal();
1498 selectExprMode();
1499 int pos2 = token.pos;
1500 nextToken();
1501 if (token.kind == LT) typeArgs = typeArguments(false);
1502 t = innerCreator(pos2, typeArgs, t);
1503 typeArgs = null;
1504 } else {
1505 List<JCAnnotation> tyannos = null;
1506 if ((mode & TYPE) != 0 && token.kind == MONKEYS_AT) {
1507 // is the mode check needed?
1508 tyannos = typeAnnotationsOpt();
1509 }
1510 t = toP(F.at(pos1).Select(t, ident(true)));
1511 if (tyannos != null && tyannos.nonEmpty()) {
1512 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1513 }
1514 t = argumentsOpt(typeArgs, typeArgumentsOpt(t));
1515 typeArgs = null;
1516 }
1517 } else if ((mode & EXPR) != 0 && token.kind == COLCOL) {
1518 selectExprMode();
1519 if (typeArgs != null) return illegal();
1520 accept(COLCOL);
1521 t = memberReferenceSuffix(pos1, t);
1522 } else {
1523 if (!annos.isEmpty()) {
1524 if (permitTypeAnnotationsPushBack)
1525 typeAnnotationsPushedBack = annos;
1526 else
1527 return illegal(annos.head.pos);
1528 }
1529 break;
1530 }
1531 }
1532 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && (mode & EXPR) != 0) {
1533 selectExprMode();
1534 t = to(F.at(token.pos).Unary(
1535 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1536 nextToken();
1537 }
1538 return toP(t);
1539 }
1540
1541 /**
1542 * If we see an identifier followed by a '<' it could be an unbound
1543 * method reference or a binary expression. To disambiguate, look for a
1544 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1545 */
1546 @SuppressWarnings("fallthrough")
1547 boolean isUnboundMemberRef() {
1548 int pos = 0, depth = 0;
1549 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1550 switch (t.kind) {
1551 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1552 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1553 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1554 case DOUBLE: case BOOLEAN: case CHAR:
1555 case MONKEYS_AT:
1556 break;
1557
1558 case LPAREN:
1559 // skip annotation values
1560 int nesting = 0;
1561 for (; ; pos++) {
1562 TokenKind tk2 = S.token(pos).kind;
1563 switch (tk2) {
1564 case EOF:
1565 return false;
1566 case LPAREN:
1567 nesting++;
1568 break;
1569 case RPAREN:
1570 nesting--;
1571 if (nesting == 0) {
1572 continue outer;
1573 }
1574 break;
1575 }
1576 }
1577
1578 case LT:
1579 depth++; break;
1580 case GTGTGT:
1581 depth--;
1582 case GTGT:
1583 depth--;
1584 case GT:
1585 depth--;
1586 if (depth == 0) {
1587 TokenKind nextKind = S.token(pos + 1).kind;
1588 return
1589 nextKind == TokenKind.DOT ||
1590 nextKind == TokenKind.LBRACKET ||
1591 nextKind == TokenKind.COLCOL;
1592 }
1593 break;
1594 default:
1595 return false;
1596 }
1597 }
1598 }
1599
1600 /**
1601 * If we see an identifier followed by a '<' it could be an unbound
1602 * method reference or a binary expression. To disambiguate, look for a
1603 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1604 */
1605 @SuppressWarnings("fallthrough")
1606 ParensResult analyzeParens() {
1607 int depth = 0;
1608 boolean type = false;
1609 ParensResult defaultResult = ParensResult.PARENS;
1610 outer: for (int lookahead = 0 ; ; lookahead++) {
1611 TokenKind tk = S.token(lookahead).kind;
1612 switch (tk) {
1613 case COMMA:
1614 type = true;
1615 case EXTENDS: case SUPER: case DOT: case AMP:
1616 //skip
1617 break;
1618 case QUES:
1619 if (peekToken(lookahead, EXTENDS) ||
1620 peekToken(lookahead, SUPER)) {
1621 //wildcards
1622 type = true;
1623 }
1624 break;
1625 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1626 case DOUBLE: case BOOLEAN: case CHAR: case VOID:
1627 if (peekToken(lookahead, RPAREN)) {
1628 //Type, ')' -> cast
1629 return ParensResult.CAST;
1630 } else if (peekToken(lookahead, LAX_IDENTIFIER)) {
1631 //Type, Identifier/'_'/'assert'/'enum' -> explicit lambda
1632 return ParensResult.EXPLICIT_LAMBDA;
1633 }
1634 break;
1635 case LPAREN:
1636 if (lookahead != 0) {
1637 // '(' in a non-starting position -> parens
1638 return ParensResult.PARENS;
1639 } else if (peekToken(lookahead, RPAREN)) {
1640 // '(', ')' -> explicit lambda
1641 return ParensResult.EXPLICIT_LAMBDA;
1642 }
1643 break;
1644 case RPAREN:
1645 // if we have seen something that looks like a type,
1646 // then it's a cast expression
1647 if (type) return ParensResult.CAST;
1648 // otherwise, disambiguate cast vs. parenthesized expression
1649 // based on subsequent token.
1650 switch (S.token(lookahead + 1).kind) {
1651 /*case PLUSPLUS: case SUBSUB: */
1652 case BANG: case TILDE:
1653 case LPAREN: case THIS: case SUPER:
1654 case INTLITERAL: case LONGLITERAL: case FLOATLITERAL:
1655 case DOUBLELITERAL: case CHARLITERAL: case STRINGLITERAL:
1656 case TRUE: case FALSE: case NULL:
1657 case NEW: case IDENTIFIER: case ASSERT: case ENUM: case UNDERSCORE:
1658 case BYTE: case SHORT: case CHAR: case INT:
1659 case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
1660 return ParensResult.CAST;
1661 default:
1662 return defaultResult;
1663 }
1664 case UNDERSCORE:
1665 case ASSERT:
1666 case ENUM:
1667 case IDENTIFIER:
1668 if (peekToken(lookahead, LAX_IDENTIFIER)) {
1669 // Identifier, Identifier/'_'/'assert'/'enum' -> explicit lambda
1670 return ParensResult.EXPLICIT_LAMBDA;
1671 } else if (peekToken(lookahead, RPAREN, ARROW)) {
1672 // Identifier, ')' '->' -> implicit lambda
1673 return (mode & NOLAMBDA) == 0 ? ParensResult.IMPLICIT_LAMBDA
1674 : ParensResult.PARENS;
1675 } else if (depth == 0 && peekToken(lookahead, COMMA)) {
1676 defaultResult = ParensResult.IMPLICIT_LAMBDA;
1677 }
1678 type = false;
1679 break;
1680 case FINAL:
1681 case ELLIPSIS:
1682 //those can only appear in explicit lambdas
1683 return ParensResult.EXPLICIT_LAMBDA;
1684 case MONKEYS_AT:
1685 type = true;
1686 lookahead += 1; //skip '@'
1687 while (peekToken(lookahead, DOT)) {
1688 lookahead += 2;
1689 }
1690 if (peekToken(lookahead, LPAREN)) {
1691 lookahead++;
1692 //skip annotation values
1693 int nesting = 0;
1694 for (; ; lookahead++) {
1695 TokenKind tk2 = S.token(lookahead).kind;
1696 switch (tk2) {
1697 case EOF:
1698 return ParensResult.PARENS;
1699 case LPAREN:
1700 nesting++;
1701 break;
1702 case RPAREN:
1703 nesting--;
1704 if (nesting == 0) {
1705 continue outer;
1706 }
1707 break;
1708 }
1709 }
1710 }
1711 break;
1712 case LBRACKET:
1713 if (peekToken(lookahead, RBRACKET, LAX_IDENTIFIER)) {
1714 // '[', ']', Identifier/'_'/'assert'/'enum' -> explicit lambda
1715 return ParensResult.EXPLICIT_LAMBDA;
1716 } else if (peekToken(lookahead, RBRACKET, RPAREN) ||
1717 peekToken(lookahead, RBRACKET, AMP)) {
1718 // '[', ']', ')' -> cast
1719 // '[', ']', '&' -> cast (intersection type)
1720 return ParensResult.CAST;
1721 } else if (peekToken(lookahead, RBRACKET)) {
1722 //consume the ']' and skip
1723 type = true;
1724 lookahead++;
1725 break;
1726 } else {
1727 return ParensResult.PARENS;
1728 }
1729 case LT:
1730 depth++; break;
1731 case GTGTGT:
1732 depth--;
1733 case GTGT:
1734 depth--;
1735 case GT:
1736 depth--;
1737 if (depth == 0) {
1738 if (peekToken(lookahead, RPAREN) ||
1739 peekToken(lookahead, AMP)) {
1740 // '>', ')' -> cast
1741 // '>', '&' -> cast
1742 return ParensResult.CAST;
1743 } else if (peekToken(lookahead, LAX_IDENTIFIER, COMMA) ||
1744 peekToken(lookahead, LAX_IDENTIFIER, RPAREN, ARROW) ||
1745 peekToken(lookahead, ELLIPSIS)) {
1746 // '>', Identifier/'_'/'assert'/'enum', ',' -> explicit lambda
1747 // '>', Identifier/'_'/'assert'/'enum', ')', '->' -> explicit lambda
1748 // '>', '...' -> explicit lambda
1749 return ParensResult.EXPLICIT_LAMBDA;
1750 }
1751 //it looks a type, but could still be (i) a cast to generic type,
1752 //(ii) an unbound method reference or (iii) an explicit lambda
1753 type = true;
1754 break;
1755 } else if (depth < 0) {
1756 //unbalanced '<', '>' - not a generic type
1757 return ParensResult.PARENS;
1758 }
1759 break;
1760 default:
1761 //this includes EOF
1762 return defaultResult;
1763 }
1764 }
1765 }
1766
1767 /** Accepts all identifier-like tokens */
1768 protected Filter<TokenKind> LAX_IDENTIFIER = t -> t == IDENTIFIER || t == UNDERSCORE || t == ASSERT || t == ENUM;
1769
1770 enum ParensResult {
1771 CAST,
1772 EXPLICIT_LAMBDA,
1773 IMPLICIT_LAMBDA,
1774 PARENS
1775 }
1776
1777 JCExpression lambdaExpressionOrStatement(boolean hasParens, boolean explicitParams, int pos) {
1778 List<JCVariableDecl> params = explicitParams ?
1779 formalParameters(true) :
1780 implicitParameters(hasParens);
1781 if (explicitParams) {
1782 LambdaClassifier lambdaClassifier = new LambdaClassifier();
1783 for (JCVariableDecl param: params) {
1784 if (param.vartype != null &&
1785 isRestrictedLocalVarTypeName(param.vartype, false) &&
1786 param.vartype.hasTag(TYPEARRAY)) {
1787 log.error(DiagnosticFlag.SYNTAX, param.pos,
1788 Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS.allowedInSource(source)
1789 ? Errors.VarNotAllowedArray : Errors.VarNotAllowedHere);
1790 }
1791 lambdaClassifier.addParameter(param);
1792 if (lambdaClassifier.result() == LambdaParameterKind.ERROR) {
1793 break;
1794 }
1795 }
1796 if (lambdaClassifier.diagFragment != null) {
1797 log.error(DiagnosticFlag.SYNTAX, pos, Errors.InvalidLambdaParameterDeclaration(lambdaClassifier.diagFragment));
1798 }
1799 for (JCVariableDecl param: params) {
1800 if (param.vartype != null
1801 && isRestrictedLocalVarTypeName(param.vartype, true)) {
1802 checkSourceLevel(param.pos, Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS);
1803 param.startPos = TreeInfo.getStartPos(param.vartype);
1804 param.vartype = null;
1805 }
1806 }
1807 }
1808 return lambdaExpressionOrStatementRest(params, pos);
1809 }
1810
1811 enum LambdaParameterKind {
1812 VAR(0),
1813 EXPLICIT(1),
1814 IMPLICIT(2),
1815 ERROR(-1);
1816
1817 private final int index;
1818
1819 LambdaParameterKind(int index) {
1820 this.index = index;
1821 }
1822 }
1823
1824 private final static Fragment[][] decisionTable = new Fragment[][] {
1825 /* VAR EXPLICIT IMPLICIT */
1826 /* VAR */ {null, VarAndExplicitNotAllowed, VarAndImplicitNotAllowed},
1827 /* EXPLICIT */ {VarAndExplicitNotAllowed, null, ImplicitAndExplicitNotAllowed},
1828 /* IMPLICIT */ {VarAndImplicitNotAllowed, ImplicitAndExplicitNotAllowed, null},
1829 };
1830
1831 class LambdaClassifier {
1832
1833 LambdaParameterKind kind;
1834 Fragment diagFragment;
1835 List<JCVariableDecl> params;
1836
1837 void addParameter(JCVariableDecl param) {
1838 if (param.vartype != null && param.name != names.empty) {
1839 if (isRestrictedLocalVarTypeName(param.vartype, false)) {
1840 reduce(LambdaParameterKind.VAR);
1841 } else {
1842 reduce(LambdaParameterKind.EXPLICIT);
1843 }
1844 }
1845 if (param.vartype == null && param.name != names.empty ||
1846 param.vartype != null && param.name == names.empty) {
1847 reduce(LambdaParameterKind.IMPLICIT);
1848 }
1849 }
1850
1851 private void reduce(LambdaParameterKind newKind) {
1852 if (kind == null) {
1853 kind = newKind;
1854 } else if (kind != newKind && kind != LambdaParameterKind.ERROR) {
1855 LambdaParameterKind currentKind = kind;
1856 kind = LambdaParameterKind.ERROR;
1857 boolean varIndex = currentKind.index == LambdaParameterKind.VAR.index ||
1858 newKind.index == LambdaParameterKind.VAR.index;
1859 diagFragment = Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS.allowedInSource(source) || !varIndex ?
1860 decisionTable[currentKind.index][newKind.index] : null;
1861 }
1862 }
1863
1864 LambdaParameterKind result() {
1865 return kind;
1866 }
1867 }
1868
1869 JCExpression lambdaExpressionOrStatementRest(List<JCVariableDecl> args, int pos) {
1870 checkSourceLevel(Feature.LAMBDA);
1871 accept(ARROW);
1872
1873 return token.kind == LBRACE ?
1874 lambdaStatement(args, pos, token.pos) :
1875 lambdaExpression(args, pos);
1876 }
1877
1878 JCExpression lambdaStatement(List<JCVariableDecl> args, int pos, int pos2) {
1879 JCBlock block = block(pos2, 0);
1880 return toP(F.at(pos).Lambda(args, block));
1881 }
1882
1883 JCExpression lambdaExpression(List<JCVariableDecl> args, int pos) {
1884 JCTree expr = parseExpression();
1885 return toP(F.at(pos).Lambda(args, expr));
1886 }
1887
1888 /** SuperSuffix = Arguments | "." [TypeArguments] Ident [Arguments]
1889 */
1890 JCExpression superSuffix(List<JCExpression> typeArgs, JCExpression t) {
1891 nextToken();
1892 if (token.kind == LPAREN || typeArgs != null) {
1893 t = arguments(typeArgs, t);
1894 } else if (token.kind == COLCOL) {
1895 if (typeArgs != null) return illegal();
1896 t = memberReferenceSuffix(t);
1897 } else {
1898 int pos = token.pos;
1899 accept(DOT);
1900 typeArgs = (token.kind == LT) ? typeArguments(false) : null;
1901 t = toP(F.at(pos).Select(t, ident()));
1902 t = argumentsOpt(typeArgs, t);
1903 }
1904 return t;
1905 }
1906
1907 /** BasicType = BYTE | SHORT | CHAR | INT | LONG | FLOAT | DOUBLE | BOOLEAN
1908 */
1909 JCPrimitiveTypeTree basicType() {
1910 JCPrimitiveTypeTree t = to(F.at(token.pos).TypeIdent(typetag(token.kind)));
1911 nextToken();
1912 return t;
1913 }
1914
1915 /** ArgumentsOpt = [ Arguments ]
1916 */
1917 JCExpression argumentsOpt(List<JCExpression> typeArgs, JCExpression t) {
1918 if ((mode & EXPR) != 0 && token.kind == LPAREN || typeArgs != null) {
1919 selectExprMode();
1920 return arguments(typeArgs, t);
1921 } else {
1922 return t;
1923 }
1924 }
1925
1926 /** Arguments = "(" [Expression { COMMA Expression }] ")"
1927 */
1928 List<JCExpression> arguments() {
1929 ListBuffer<JCExpression> args = new ListBuffer<>();
1930 if (token.kind == LPAREN) {
1931 nextToken();
1932 if (token.kind != RPAREN) {
1933 args.append(parseExpression());
1934 while (token.kind == COMMA) {
1935 nextToken();
1936 args.append(parseExpression());
1937 }
1938 }
1939 accept(RPAREN);
1940 } else {
1941 syntaxError(token.pos, Errors.Expected(LPAREN));
1942 }
1943 return args.toList();
1944 }
1945
1946 JCMethodInvocation arguments(List<JCExpression> typeArgs, JCExpression t) {
1947 int pos = token.pos;
1948 List<JCExpression> args = arguments();
1949 return toP(F.at(pos).Apply(typeArgs, t, args));
1950 }
1951
1952 /** TypeArgumentsOpt = [ TypeArguments ]
1953 */
1954 JCExpression typeArgumentsOpt(JCExpression t) {
1955 if (token.kind == LT &&
1956 (mode & TYPE) != 0 &&
1957 (mode & NOPARAMS) == 0) {
1958 selectTypeMode();
1959 return typeArguments(t, false);
1960 } else {
1961 return t;
1962 }
1963 }
1964 List<JCExpression> typeArgumentsOpt() {
1965 return typeArgumentsOpt(TYPE);
1966 }
1967
1968 List<JCExpression> typeArgumentsOpt(int useMode) {
1969 if (token.kind == LT) {
1970 if ((mode & useMode) == 0 ||
1971 (mode & NOPARAMS) != 0) {
1972 illegal();
1973 }
1974 mode = useMode;
1975 return typeArguments(false);
1976 }
1977 return null;
1978 }
1979
1980 /**
1981 * {@literal
1982 * TypeArguments = "<" TypeArgument {"," TypeArgument} ">"
1983 * }
1984 */
1985 List<JCExpression> typeArguments(boolean diamondAllowed) {
1986 if (token.kind == LT) {
1987 nextToken();
1988 if (token.kind == GT && diamondAllowed) {
1989 checkSourceLevel(Feature.DIAMOND);
1990 mode |= DIAMOND;
1991 nextToken();
1992 return List.nil();
1993 } else {
1994 ListBuffer<JCExpression> args = new ListBuffer<>();
1995 args.append(((mode & EXPR) == 0) ? typeArgument() : parseType());
1996 while (token.kind == COMMA) {
1997 nextToken();
1998 args.append(((mode & EXPR) == 0) ? typeArgument() : parseType());
1999 }
2000 switch (token.kind) {
2001
2002 case GTGTGTEQ: case GTGTEQ: case GTEQ:
2003 case GTGTGT: case GTGT:
2004 token = S.split();
2005 break;
2006 case GT:
2007 nextToken();
2008 break;
2009 default:
2010 args.append(syntaxError(token.pos, Errors.Expected(GT)));
2011 break;
2012 }
2013 return args.toList();
2014 }
2015 } else {
2016 return List.of(syntaxError(token.pos, Errors.Expected(LT)));
2017 }
2018 }
2019
2020 /**
2021 * {@literal
2022 * TypeArgument = Type
2023 * | [Annotations] "?"
2024 * | [Annotations] "?" EXTENDS Type {"&" Type}
2025 * | [Annotations] "?" SUPER Type
2026 * }
2027 */
2028 JCExpression typeArgument() {
2029 List<JCAnnotation> annotations = typeAnnotationsOpt();
2030 if (token.kind != QUES) return parseType(false, annotations);
2031 int pos = token.pos;
2032 nextToken();
2033 JCExpression result;
2034 if (token.kind == EXTENDS) {
2035 TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.EXTENDS));
2036 nextToken();
2037 JCExpression bound = parseType();
2038 result = F.at(pos).Wildcard(t, bound);
2039 } else if (token.kind == SUPER) {
2040 TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.SUPER));
2041 nextToken();
2042 JCExpression bound = parseType();
2043 result = F.at(pos).Wildcard(t, bound);
2044 } else if (LAX_IDENTIFIER.accepts(token.kind)) {
2045 //error recovery
2046 TypeBoundKind t = F.at(Position.NOPOS).TypeBoundKind(BoundKind.UNBOUND);
2047 JCExpression wc = toP(F.at(pos).Wildcard(t, null));
2048 JCIdent id = toP(F.at(token.pos).Ident(ident()));
2049 JCErroneous err = F.at(pos).Erroneous(List.<JCTree>of(wc, id));
2050 reportSyntaxError(err, Errors.Expected3(GT, EXTENDS, SUPER));
2051 result = err;
2052 } else {
2053 TypeBoundKind t = toP(F.at(pos).TypeBoundKind(BoundKind.UNBOUND));
2054 result = toP(F.at(pos).Wildcard(t, null));
2055 }
2056 if (!annotations.isEmpty()) {
2057 result = toP(F.at(annotations.head.pos).AnnotatedType(annotations,result));
2058 }
2059 return result;
2060 }
2061
2062 JCTypeApply typeArguments(JCExpression t, boolean diamondAllowed) {
2063 int pos = token.pos;
2064 List<JCExpression> args = typeArguments(diamondAllowed);
2065 return toP(F.at(pos).TypeApply(t, args));
2066 }
2067
2068 /**
2069 * BracketsOpt = { [Annotations] "[" "]" }*
2070 *
2071 * <p>
2072 *
2073 * <code>annotations</code> is the list of annotations targeting
2074 * the expression <code>t</code>.
2075 */
2076 private JCExpression bracketsOpt(JCExpression t,
2077 List<JCAnnotation> annotations) {
2078 List<JCAnnotation> nextLevelAnnotations = typeAnnotationsOpt();
2079
2080 if (token.kind == LBRACKET) {
2081 int pos = token.pos;
2082 nextToken();
2083 t = bracketsOptCont(t, pos, nextLevelAnnotations);
2084 } else if (!nextLevelAnnotations.isEmpty()) {
2085 if (permitTypeAnnotationsPushBack) {
2086 this.typeAnnotationsPushedBack = nextLevelAnnotations;
2087 } else {
2088 return illegal(nextLevelAnnotations.head.pos);
2089 }
2090 }
2091
2092 if (!annotations.isEmpty()) {
2093 t = toP(F.at(token.pos).AnnotatedType(annotations, t));
2094 }
2095 return t;
2096 }
2097
2098 /** BracketsOpt = [ "[" "]" { [Annotations] "[" "]"} ]
2099 */
2100 private JCExpression bracketsOpt(JCExpression t) {
2101 return bracketsOpt(t, List.nil());
2102 }
2103
2104 private JCExpression bracketsOptCont(JCExpression t, int pos,
2105 List<JCAnnotation> annotations) {
2106 accept(RBRACKET);
2107 t = bracketsOpt(t);
2108 t = toP(F.at(pos).TypeArray(t));
2109 if (annotations.nonEmpty()) {
2110 t = toP(F.at(pos).AnnotatedType(annotations, t));
2111 }
2112 return t;
2113 }
2114
2115 /** BracketsSuffixExpr = "." CLASS
2116 * BracketsSuffixType =
2117 */
2118 JCExpression bracketsSuffix(JCExpression t) {
2119 if ((mode & EXPR) != 0 && token.kind == DOT) {
2120 selectExprMode();
2121 int pos = token.pos;
2122 nextToken();
2123 accept(CLASS);
2124 if (token.pos == endPosTable.errorEndPos) {
2125 // error recovery
2126 Name name;
2127 if (LAX_IDENTIFIER.accepts(token.kind)) {
2128 name = token.name();
2129 nextToken();
2130 } else {
2131 name = names.error;
2132 }
2133 t = F.at(pos).Erroneous(List.<JCTree>of(toP(F.at(pos).Select(t, name))));
2134 } else {
2135 Tag tag = t.getTag();
2136 // Type annotations are illegal on class literals. Annotated non array class literals
2137 // are complained about directly in term3(), Here check for type annotations on dimensions
2138 // taking care to handle some interior dimension(s) being annotated.
2139 if ((tag == TYPEARRAY && TreeInfo.containsTypeAnnotation(t)) || tag == ANNOTATED_TYPE)
2140 syntaxError(token.pos, Errors.NoAnnotationsOnDotClass);
2141 t = toP(F.at(pos).Select(t, names._class));
2142 }
2143 } else if ((mode & TYPE) != 0) {
2144 if (token.kind != COLCOL) {
2145 selectTypeMode();
2146 }
2147 } else if (token.kind != COLCOL) {
2148 syntaxError(token.pos, Errors.DotClassExpected);
2149 }
2150 return t;
2151 }
2152
2153 /**
2154 * MemberReferenceSuffix = "::" [TypeArguments] Ident
2155 * | "::" [TypeArguments] "new"
2156 */
2157 JCExpression memberReferenceSuffix(JCExpression t) {
2158 int pos1 = token.pos;
2159 accept(COLCOL);
2160 return memberReferenceSuffix(pos1, t);
2161 }
2162
2163 JCExpression memberReferenceSuffix(int pos1, JCExpression t) {
2164 checkSourceLevel(Feature.METHOD_REFERENCES);
2165 selectExprMode();
2166 List<JCExpression> typeArgs = null;
2167 if (token.kind == LT) {
2168 typeArgs = typeArguments(false);
2169 }
2170 Name refName;
2171 ReferenceMode refMode;
2172 if (token.kind == NEW) {
2173 refMode = ReferenceMode.NEW;
2174 refName = names.init;
2175 nextToken();
2176 } else {
2177 refMode = ReferenceMode.INVOKE;
2178 refName = ident();
2179 }
2180 return toP(F.at(t.getStartPosition()).Reference(refMode, refName, t, typeArgs));
2181 }
2182
2183 /** Creator = [Annotations] Qualident [TypeArguments] ( ArrayCreatorRest | ClassCreatorRest )
2184 */
2185 JCExpression creator(int newpos, List<JCExpression> typeArgs) {
2186 List<JCAnnotation> newAnnotations = typeAnnotationsOpt();
2187
2188 switch (token.kind) {
2189 case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
2190 case DOUBLE: case BOOLEAN:
2191 if (typeArgs == null) {
2192 if (newAnnotations.isEmpty()) {
2193 return arrayCreatorRest(newpos, basicType());
2194 } else {
2195 return arrayCreatorRest(newpos, toP(F.at(newAnnotations.head.pos).AnnotatedType(newAnnotations, basicType())));
2196 }
2197 }
2198 break;
2199 default:
2200 }
2201 JCExpression t = qualident(true);
2202
2203 int oldmode = mode;
2204 selectTypeMode();
2205 boolean diamondFound = false;
2206 int lastTypeargsPos = -1;
2207 if (token.kind == LT) {
2208 lastTypeargsPos = token.pos;
2209 t = typeArguments(t, true);
2210 diamondFound = (mode & DIAMOND) != 0;
2211 }
2212 while (token.kind == DOT) {
2213 if (diamondFound) {
2214 //cannot select after a diamond
2215 illegal();
2216 }
2217 int pos = token.pos;
2218 nextToken();
2219 List<JCAnnotation> tyannos = typeAnnotationsOpt();
2220 t = toP(F.at(pos).Select(t, ident()));
2221
2222 if (tyannos != null && tyannos.nonEmpty()) {
2223 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
2224 }
2225
2226 if (token.kind == LT) {
2227 lastTypeargsPos = token.pos;
2228 t = typeArguments(t, true);
2229 diamondFound = (mode & DIAMOND) != 0;
2230 }
2231 }
2232 mode = oldmode;
2233 if (token.kind == LBRACKET || token.kind == MONKEYS_AT) {
2234 // handle type annotations for non primitive arrays
2235 if (newAnnotations.nonEmpty()) {
2236 t = insertAnnotationsToMostInner(t, newAnnotations, false);
2237 }
2238
2239 JCExpression e = arrayCreatorRest(newpos, t);
2240 if (diamondFound) {
2241 reportSyntaxError(lastTypeargsPos, Errors.CannotCreateArrayWithDiamond);
2242 return toP(F.at(newpos).Erroneous(List.of(e)));
2243 }
2244 else if (typeArgs != null) {
2245 int pos = newpos;
2246 if (!typeArgs.isEmpty() && typeArgs.head.pos != Position.NOPOS) {
2247 // note: this should always happen but we should
2248 // not rely on this as the parser is continuously
2249 // modified to improve error recovery.
2250 pos = typeArgs.head.pos;
2251 }
2252 setErrorEndPos(S.prevToken().endPos);
2253 JCErroneous err = F.at(pos).Erroneous(typeArgs.prepend(e));
2254 reportSyntaxError(err, Errors.CannotCreateArrayWithTypeArguments);
2255 return toP(err);
2256 }
2257 return e;
2258 } else if (token.kind == LPAREN) {
2259 // handle type annotations for instantiations and anonymous classes
2260 if (newAnnotations.nonEmpty()) {
2261 t = insertAnnotationsToMostInner(t, newAnnotations, false);
2262 }
2263 return classCreatorRest(newpos, null, typeArgs, t);
2264 } else {
2265 setErrorEndPos(token.pos);
2266 reportSyntaxError(token.pos, Errors.Expected2(LPAREN, LBRACKET));
2267 t = toP(F.at(newpos).NewClass(null, typeArgs, t, List.nil(), null));
2268 return toP(F.at(newpos).Erroneous(List.<JCTree>of(t)));
2269 }
2270 }
2271
2272 /** InnerCreator = [Annotations] Ident [TypeArguments] ClassCreatorRest
2273 */
2274 JCExpression innerCreator(int newpos, List<JCExpression> typeArgs, JCExpression encl) {
2275 List<JCAnnotation> newAnnotations = typeAnnotationsOpt();
2276
2277 JCExpression t = toP(F.at(token.pos).Ident(ident()));
2278
2279 if (newAnnotations.nonEmpty()) {
2280 t = toP(F.at(newAnnotations.head.pos).AnnotatedType(newAnnotations, t));
2281 }
2282
2283 if (token.kind == LT) {
2284 int oldmode = mode;
2285 t = typeArguments(t, true);
2286 mode = oldmode;
2287 }
2288 return classCreatorRest(newpos, encl, typeArgs, t);
2289 }
2290
2291 /** ArrayCreatorRest = [Annotations] "[" ( "]" BracketsOpt ArrayInitializer
2292 * | Expression "]" {[Annotations] "[" Expression "]"} BracketsOpt )
2293 */
2294 JCExpression arrayCreatorRest(int newpos, JCExpression elemtype) {
2295 List<JCAnnotation> annos = typeAnnotationsOpt();
2296
2297 accept(LBRACKET);
2298 if (token.kind == RBRACKET) {
2299 accept(RBRACKET);
2300 elemtype = bracketsOpt(elemtype, annos);
2301 if (token.kind == LBRACE) {
2302 JCNewArray na = (JCNewArray)arrayInitializer(newpos, elemtype);
2303 if (annos.nonEmpty()) {
2304 // when an array initializer is present then
2305 // the parsed annotations should target the
2306 // new array tree
2307 // bracketsOpt inserts the annotation in
2308 // elemtype, and it needs to be corrected
2309 //
2310 JCAnnotatedType annotated = (JCAnnotatedType)elemtype;
2311 assert annotated.annotations == annos;
2312 na.annotations = annotated.annotations;
2313 na.elemtype = annotated.underlyingType;
2314 }
2315 return na;
2316 } else {
2317 JCExpression t = toP(F.at(newpos).NewArray(elemtype, List.nil(), null));
2318 return syntaxError(token.pos, List.of(t), Errors.ArrayDimensionMissing);
2319 }
2320 } else {
2321 ListBuffer<JCExpression> dims = new ListBuffer<>();
2322
2323 // maintain array dimension type annotations
2324 ListBuffer<List<JCAnnotation>> dimAnnotations = new ListBuffer<>();
2325 dimAnnotations.append(annos);
2326
2327 dims.append(parseExpression());
2328 accept(RBRACKET);
2329 while (token.kind == LBRACKET
2330 || token.kind == MONKEYS_AT) {
2331 List<JCAnnotation> maybeDimAnnos = typeAnnotationsOpt();
2332 int pos = token.pos;
2333 nextToken();
2334 if (token.kind == RBRACKET) {
2335 elemtype = bracketsOptCont(elemtype, pos, maybeDimAnnos);
2336 } else {
2337 if (token.kind == RBRACKET) { // no dimension
2338 elemtype = bracketsOptCont(elemtype, pos, maybeDimAnnos);
2339 } else {
2340 dimAnnotations.append(maybeDimAnnos);
2341 dims.append(parseExpression());
2342 accept(RBRACKET);
2343 }
2344 }
2345 }
2346
2347 List<JCExpression> elems = null;
2348 int errpos = token.pos;
2349
2350 if (token.kind == LBRACE) {
2351 elems = arrayInitializerElements(newpos, elemtype);
2352 }
2353
2354 JCNewArray na = toP(F.at(newpos).NewArray(elemtype, dims.toList(), elems));
2355 na.dimAnnotations = dimAnnotations.toList();
2356
2357 if (elems != null) {
2358 return syntaxError(errpos, List.of(na), Errors.IllegalArrayCreationBothDimensionAndInitialization);
2359 }
2360
2361 return na;
2362 }
2363 }
2364
2365 /** ClassCreatorRest = Arguments [ClassBody]
2366 */
2367 JCNewClass classCreatorRest(int newpos,
2368 JCExpression encl,
2369 List<JCExpression> typeArgs,
2370 JCExpression t)
2371 {
2372 List<JCExpression> args = arguments();
2373 JCClassDecl body = null;
2374 if (token.kind == LBRACE) {
2375 int pos = token.pos;
2376 List<JCTree> defs = classOrInterfaceBody(names.empty, false);
2377 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
2378 body = toP(F.at(pos).AnonymousClassDef(mods, defs));
2379 }
2380 return toP(F.at(newpos).NewClass(encl, typeArgs, t, args, body));
2381 }
2382
2383 /** ArrayInitializer = "{" [VariableInitializer {"," VariableInitializer}] [","] "}"
2384 */
2385 JCExpression arrayInitializer(int newpos, JCExpression t) {
2386 List<JCExpression> elems = arrayInitializerElements(newpos, t);
2387 return toP(F.at(newpos).NewArray(t, List.nil(), elems));
2388 }
2389
2390 List<JCExpression> arrayInitializerElements(int newpos, JCExpression t) {
2391 accept(LBRACE);
2392 ListBuffer<JCExpression> elems = new ListBuffer<>();
2393 if (token.kind == COMMA) {
2394 nextToken();
2395 } else if (token.kind != RBRACE) {
2396 elems.append(variableInitializer());
2397 while (token.kind == COMMA) {
2398 nextToken();
2399 if (token.kind == RBRACE) break;
2400 elems.append(variableInitializer());
2401 }
2402 }
2403 accept(RBRACE);
2404 return elems.toList();
2405 }
2406
2407 /** VariableInitializer = ArrayInitializer | Expression
2408 */
2409 public JCExpression variableInitializer() {
2410 return token.kind == LBRACE ? arrayInitializer(token.pos, null) : parseExpression();
2411 }
2412
2413 /** ParExpression = "(" Expression ")"
2414 */
2415 JCExpression parExpression() {
2416 int pos = token.pos;
2417 accept(LPAREN);
2418 JCExpression t = parseExpression();
2419 accept(RPAREN);
2420 return toP(F.at(pos).Parens(t));
2421 }
2422
2423 /** Block = "{" BlockStatements "}"
2424 */
2425 JCBlock block(int pos, long flags) {
2426 accept(LBRACE);
2427 List<JCStatement> stats = blockStatements();
2428 JCBlock t = F.at(pos).Block(flags, stats);
2429 while (token.kind == CASE || token.kind == DEFAULT) {
2430 syntaxError(token.pos, Errors.Orphaned(token.kind));
2431 switchBlockStatementGroups();
2432 }
2433 // the Block node has a field "endpos" for first char of last token, which is
2434 // usually but not necessarily the last char of the last token.
2435 t.endpos = token.pos;
2436 accept(RBRACE);
2437 return toP(t);
2438 }
2439
2440 public JCBlock block() {
2441 return block(token.pos, 0);
2442 }
2443
2444 /** BlockStatements = { BlockStatement }
2445 * BlockStatement = LocalVariableDeclarationStatement
2446 * | ClassOrInterfaceOrEnumDeclaration
2447 * | [Ident ":"] Statement
2448 * LocalVariableDeclarationStatement
2449 * = { FINAL | '@' Annotation } Type VariableDeclarators ";"
2450 */
2451 @SuppressWarnings("fallthrough")
2452 List<JCStatement> blockStatements() {
2453 //todo: skip to anchor on error(?)
2454 int lastErrPos = -1;
2455 ListBuffer<JCStatement> stats = new ListBuffer<>();
2456 while (true) {
2457 List<JCStatement> stat = blockStatement();
2458 if (stat.isEmpty()) {
2459 return stats.toList();
2460 } else {
2461 // error recovery
2462 if (token.pos == lastErrPos)
2463 return stats.toList();
2464 if (token.pos <= endPosTable.errorEndPos) {
2465 skip(false, true, true, true);
2466 lastErrPos = token.pos;
2467 }
2468 stats.addAll(stat);
2469 }
2470 }
2471 }
2472
2473 /*
2474 * Parse a Statement (JLS 14.5). As an enhancement to improve error recovery,
2475 * this method will also recognize variable and class declarations (which are
2476 * not legal for a Statement) by delegating the parsing to BlockStatement (JLS 14.2).
2477 * If any illegal declarations are found, they will be wrapped in an erroneous tree,
2478 * and an error will be produced by this method.
2479 */
2480 JCStatement parseStatementAsBlock() {
2481 int pos = token.pos;
2482 List<JCStatement> stats = blockStatement();
2483 if (stats.isEmpty()) {
2484 JCErroneous e = syntaxError(pos, Errors.IllegalStartOfStmt);
2485 return toP(F.at(pos).Exec(e));
2486 } else {
2487 JCStatement first = stats.head;
2488 Error error = null;
2489 switch (first.getTag()) {
2490 case CLASSDEF:
2491 error = Errors.ClassNotAllowed;
2492 break;
2493 case VARDEF:
2494 error = Errors.VariableNotAllowed;
2495 break;
2496 }
2497 if (error != null) {
2498 log.error(DiagnosticFlag.SYNTAX, first, error);
2499 List<JCBlock> blist = List.of(F.at(first.pos).Block(0, stats));
2500 return toP(F.at(pos).Exec(F.at(first.pos).Erroneous(blist)));
2501 }
2502 return first;
2503 }
2504 }
2505
2506 /**This method parses a statement appearing inside a block.
2507 */
2508 List<JCStatement> blockStatement() {
2509 //todo: skip to anchor on error(?)
2510 int pos = token.pos;
2511 switch (token.kind) {
2512 case RBRACE: case CASE: case DEFAULT: case EOF:
2513 return List.nil();
2514 case LBRACE: case IF: case FOR: case WHILE: case DO: case TRY:
2515 case SWITCH: case SYNCHRONIZED: case RETURN: case THROW: case BREAK:
2516 case CONTINUE: case SEMI: case ELSE: case FINALLY: case CATCH:
2517 case ASSERT:
2518 return List.of(parseSimpleStatement());
2519 case MONKEYS_AT:
2520 case FINAL: {
2521 Comment dc = token.comment(CommentStyle.JAVADOC);
2522 JCModifiers mods = modifiersOpt();
2523 if (token.kind == INTERFACE ||
2524 token.kind == CLASS ||
2525 token.kind == ENUM) {
2526 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
2527 } else {
2528 JCExpression t = parseType(true);
2529 return localVariableDeclarations(mods, t);
2530 }
2531 }
2532 case ABSTRACT: case STRICTFP: {
2533 Comment dc = token.comment(CommentStyle.JAVADOC);
2534 JCModifiers mods = modifiersOpt();
2535 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
2536 }
2537 case INTERFACE:
2538 case CLASS:
2539 Comment dc = token.comment(CommentStyle.JAVADOC);
2540 return List.of(classOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
2541 case ENUM:
2542 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.LocalEnum);
2543 dc = token.comment(CommentStyle.JAVADOC);
2544 return List.of(classOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
2545 default:
2546 Token prevToken = token;
2547 JCExpression t = term(EXPR | TYPE);
2548 if (token.kind == COLON && t.hasTag(IDENT)) {
2549 nextToken();
2550 JCStatement stat = parseStatementAsBlock();
2551 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
2552 } else if ((lastmode & TYPE) != 0 && LAX_IDENTIFIER.accepts(token.kind)) {
2553 pos = token.pos;
2554 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
2555 F.at(pos);
2556 return localVariableDeclarations(mods, t);
2557 } else {
2558 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
2559 t = checkExprStat(t);
2560 accept(SEMI);
2561 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
2562 return List.of(expr);
2563 }
2564 }
2565 }
2566 //where
2567 private List<JCStatement> localVariableDeclarations(JCModifiers mods, JCExpression type) {
2568 ListBuffer<JCStatement> stats =
2569 variableDeclarators(mods, type, new ListBuffer<>(), true);
2570 // A "LocalVariableDeclarationStatement" subsumes the terminating semicolon
2571 accept(SEMI);
2572 storeEnd(stats.last(), S.prevToken().endPos);
2573 return stats.toList();
2574 }
2575
2576 /** Statement =
2577 * Block
2578 * | IF ParExpression Statement [ELSE Statement]
2579 * | FOR "(" ForInitOpt ";" [Expression] ";" ForUpdateOpt ")" Statement
2580 * | FOR "(" FormalParameter : Expression ")" Statement
2581 * | WHILE ParExpression Statement
2582 * | DO Statement WHILE ParExpression ";"
2583 * | TRY Block ( Catches | [Catches] FinallyPart )
2584 * | TRY "(" ResourceSpecification ";"opt ")" Block [Catches] [FinallyPart]
2585 * | SWITCH ParExpression "{" SwitchBlockStatementGroups "}"
2586 * | SYNCHRONIZED ParExpression Block
2587 * | RETURN [Expression] ";"
2588 * | THROW Expression ";"
2589 * | BREAK [Ident] ";"
2590 * | CONTINUE [Ident] ";"
2591 * | ASSERT Expression [ ":" Expression ] ";"
2592 * | ";"
2593 */
2594 public JCStatement parseSimpleStatement() {
2595 int pos = token.pos;
2596 switch (token.kind) {
2597 case LBRACE:
2598 return block();
2599 case IF: {
2600 nextToken();
2601 JCExpression cond = parExpression();
2602 JCStatement thenpart = parseStatementAsBlock();
2603 JCStatement elsepart = null;
2604 if (token.kind == ELSE) {
2605 nextToken();
2606 elsepart = parseStatementAsBlock();
2607 }
2608 return F.at(pos).If(cond, thenpart, elsepart);
2609 }
2610 case FOR: {
2611 nextToken();
2612 accept(LPAREN);
2613 List<JCStatement> inits = token.kind == SEMI ? List.nil() : forInit();
2614 if (inits.length() == 1 &&
2615 inits.head.hasTag(VARDEF) &&
2616 ((JCVariableDecl) inits.head).init == null &&
2617 token.kind == COLON) {
2618 JCVariableDecl var = (JCVariableDecl)inits.head;
2619 accept(COLON);
2620 JCExpression expr = parseExpression();
2621 accept(RPAREN);
2622 JCStatement body = parseStatementAsBlock();
2623 return F.at(pos).ForeachLoop(var, expr, body);
2624 } else {
2625 accept(SEMI);
2626 JCExpression cond = token.kind == SEMI ? null : parseExpression();
2627 accept(SEMI);
2628 List<JCExpressionStatement> steps = token.kind == RPAREN ? List.nil() : forUpdate();
2629 accept(RPAREN);
2630 JCStatement body = parseStatementAsBlock();
2631 return F.at(pos).ForLoop(inits, cond, steps, body);
2632 }
2633 }
2634 case WHILE: {
2635 nextToken();
2636 JCExpression cond = parExpression();
2637 JCStatement body = parseStatementAsBlock();
2638 return F.at(pos).WhileLoop(cond, body);
2639 }
2640 case DO: {
2641 nextToken();
2642 JCStatement body = parseStatementAsBlock();
2643 accept(WHILE);
2644 JCExpression cond = parExpression();
2645 accept(SEMI);
2646 JCDoWhileLoop t = toP(F.at(pos).DoLoop(body, cond));
2647 return t;
2648 }
2649 case TRY: {
2650 nextToken();
2651 List<JCTree> resources = List.nil();
2652 if (token.kind == LPAREN) {
2653 nextToken();
2654 resources = resources();
2655 accept(RPAREN);
2656 }
2657 JCBlock body = block();
2658 ListBuffer<JCCatch> catchers = new ListBuffer<>();
2659 JCBlock finalizer = null;
2660 if (token.kind == CATCH || token.kind == FINALLY) {
2661 while (token.kind == CATCH) catchers.append(catchClause());
2662 if (token.kind == FINALLY) {
2663 nextToken();
2664 finalizer = block();
2665 }
2666 } else {
2667 if (resources.isEmpty()) {
2668 log.error(DiagnosticFlag.SYNTAX, pos, Errors.TryWithoutCatchFinallyOrResourceDecls);
2669 }
2670 }
2671 return F.at(pos).Try(resources, body, catchers.toList(), finalizer);
2672 }
2673 case SWITCH: {
2674 nextToken();
2675 JCExpression selector = parExpression();
2676 accept(LBRACE);
2677 List<JCCase> cases = switchBlockStatementGroups();
2678 JCSwitch t = to(F.at(pos).Switch(selector, cases));
2679 accept(RBRACE);
2680 return t;
2681 }
2682 case SYNCHRONIZED: {
2683 nextToken();
2684 JCExpression lock = parExpression();
2685 JCBlock body = block();
2686 return F.at(pos).Synchronized(lock, body);
2687 }
2688 case RETURN: {
2689 nextToken();
2690 JCExpression result = token.kind == SEMI ? null : parseExpression();
2691 accept(SEMI);
2692 JCReturn t = toP(F.at(pos).Return(result));
2693 return t;
2694 }
2695 case THROW: {
2696 nextToken();
2697 JCExpression exc = parseExpression();
2698 accept(SEMI);
2699 JCThrow t = toP(F.at(pos).Throw(exc));
2700 return t;
2701 }
2702 case BREAK: {
2703 nextToken();
2704 JCExpression value = token.kind == SEMI ? null : parseExpression();
2705 accept(SEMI);
2706 JCBreak t = toP(F.at(pos).Break(value));
2707 return t;
2708 }
2709 case CONTINUE: {
2710 nextToken();
2711 Name label = LAX_IDENTIFIER.accepts(token.kind) ? ident() : null;
2712 accept(SEMI);
2713 JCContinue t = toP(F.at(pos).Continue(label));
2714 return t;
2715 }
2716 case SEMI:
2717 nextToken();
2718 return toP(F.at(pos).Skip());
2719 case ELSE:
2720 int elsePos = token.pos;
2721 nextToken();
2722 return doRecover(elsePos, BasicErrorRecoveryAction.BLOCK_STMT, Errors.ElseWithoutIf);
2723 case FINALLY:
2724 int finallyPos = token.pos;
2725 nextToken();
2726 return doRecover(finallyPos, BasicErrorRecoveryAction.BLOCK_STMT, Errors.FinallyWithoutTry);
2727 case CATCH:
2728 return doRecover(token.pos, BasicErrorRecoveryAction.CATCH_CLAUSE, Errors.CatchWithoutTry);
2729 case ASSERT: {
2730 nextToken();
2731 JCExpression assertion = parseExpression();
2732 JCExpression message = null;
2733 if (token.kind == COLON) {
2734 nextToken();
2735 message = parseExpression();
2736 }
2737 accept(SEMI);
2738 JCAssert t = toP(F.at(pos).Assert(assertion, message));
2739 return t;
2740 }
2741 default:
2742 Assert.error();
2743 return null;
2744 }
2745 }
2746
2747 @Override
2748 public JCStatement parseStatement() {
2749 return parseStatementAsBlock();
2750 }
2751
2752 private JCStatement doRecover(int startPos, ErrorRecoveryAction action, Error errorKey) {
2753 int errPos = S.errPos();
2754 JCTree stm = action.doRecover(this);
2755 S.errPos(errPos);
2756 return toP(F.Exec(syntaxError(startPos, List.of(stm), errorKey)));
2757 }
2758
2759 /** CatchClause = CATCH "(" FormalParameter ")" Block
2760 * TODO: the "FormalParameter" is not correct, it uses the special "catchTypes" rule below.
2761 */
2762 protected JCCatch catchClause() {
2763 int pos = token.pos;
2764 accept(CATCH);
2765 accept(LPAREN);
2766 JCModifiers mods = optFinal(Flags.PARAMETER);
2767 List<JCExpression> catchTypes = catchTypes();
2768 JCExpression paramType = catchTypes.size() > 1 ?
2769 toP(F.at(catchTypes.head.getStartPosition()).TypeUnion(catchTypes)) :
2770 catchTypes.head;
2771 JCVariableDecl formal = variableDeclaratorId(mods, paramType);
2772 accept(RPAREN);
2773 JCBlock body = block();
2774 return F.at(pos).Catch(formal, body);
2775 }
2776
2777 List<JCExpression> catchTypes() {
2778 ListBuffer<JCExpression> catchTypes = new ListBuffer<>();
2779 catchTypes.add(parseType());
2780 while (token.kind == BAR) {
2781 nextToken();
2782 // Instead of qualident this is now parseType.
2783 // But would that allow too much, e.g. arrays or generics?
2784 catchTypes.add(parseType());
2785 }
2786 return catchTypes.toList();
2787 }
2788
2789 /** SwitchBlockStatementGroups = { SwitchBlockStatementGroup }
2790 * SwitchBlockStatementGroup = SwitchLabel BlockStatements
2791 * SwitchLabel = CASE ConstantExpression ":" | DEFAULT ":"
2792 */
2793 List<JCCase> switchBlockStatementGroups() {
2794 ListBuffer<JCCase> cases = new ListBuffer<>();
2795 while (true) {
2796 int pos = token.pos;
2797 switch (token.kind) {
2798 case CASE:
2799 case DEFAULT:
2800 cases.appendList(switchBlockStatementGroup());
2801 break;
2802 case RBRACE: case EOF:
2803 return cases.toList();
2804 default:
2805 nextToken(); // to ensure progress
2806 syntaxError(pos, Errors.Expected3(CASE, DEFAULT, RBRACE));
2807 }
2808 }
2809 }
2810
2811 protected List<JCCase> switchBlockStatementGroup() {
2812 int pos = token.pos;
2813 List<JCStatement> stats;
2814 JCCase c;
2815 ListBuffer<JCCase> cases = new ListBuffer<JCCase>();
2816 switch (token.kind) {
2817 case CASE: {
2818 nextToken();
2819 ListBuffer<JCExpression> pats = new ListBuffer<>();
2820 while (true) {
2821 pats.append(term(EXPR | NOLAMBDA));
2822 if (token.kind != COMMA) break;
2823 nextToken();
2824 checkSourceLevel(Feature.SWITCH_MULTIPLE_CASE_LABELS);
2825 };
2826 @SuppressWarnings("removal")
2827 CaseKind caseKind;
2828 JCTree body = null;
2829 if (token.kind == ARROW) {
2830 checkSourceLevel(Feature.SWITCH_RULE);
2831 accept(ARROW);
2832 caseKind = JCCase.RULE;
2833 JCStatement statement = parseStatementAsBlock();
2834 if (!statement.hasTag(EXEC) && !statement.hasTag(BLOCK) && !statement.hasTag(Tag.THROW)) {
2835 log.error(statement.pos(), Errors.SwitchCaseUnexpectedStatement);
2836 }
2837 stats = List.of(statement);
2838 body = stats.head;
2839 } else {
2840 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
2841 caseKind = JCCase.STATEMENT;
2842 stats = blockStatements();
2843 }
2844 c = F.at(pos).Case(caseKind, pats.toList(), stats, body);
2845 if (stats.isEmpty())
2846 storeEnd(c, S.prevToken().endPos);
2847 return cases.append(c).toList();
2848 }
2849 case DEFAULT: {
2850 nextToken();
2851 @SuppressWarnings("removal")
2852 CaseKind caseKind;
2853 JCTree body = null;
2854 if (token.kind == ARROW) {
2855 checkSourceLevel(Feature.SWITCH_RULE);
2856 accept(ARROW);
2857 caseKind = JCCase.RULE;
2858 JCStatement statement = parseStatementAsBlock();
2859 if (!statement.hasTag(EXEC) && !statement.hasTag(BLOCK) && !statement.hasTag(Tag.THROW)) {
2860 log.error(statement.pos(), Errors.SwitchCaseUnexpectedStatement);
2861 }
2862 stats = List.of(statement);
2863 body = stats.head;
2864 } else {
2865 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
2866 caseKind = JCCase.STATEMENT;
2867 stats = blockStatements();
2868 }
2869 c = F.at(pos).Case(caseKind, List.nil(), stats, body);
2870 if (stats.isEmpty())
2871 storeEnd(c, S.prevToken().endPos);
2872 return cases.append(c).toList();
2873 }
2874 }
2875 throw new AssertionError("should not reach here");
2876 }
2877
2878 /** MoreStatementExpressions = { COMMA StatementExpression }
2879 */
2880 <T extends ListBuffer<? super JCExpressionStatement>> T moreStatementExpressions(int pos,
2881 JCExpression first,
2882 T stats) {
2883 // This Exec is a "StatementExpression"; it subsumes no terminating token
2884 stats.append(toP(F.at(pos).Exec(checkExprStat(first))));
2885 while (token.kind == COMMA) {
2886 nextToken();
2887 pos = token.pos;
2888 JCExpression t = parseExpression();
2889 // This Exec is a "StatementExpression"; it subsumes no terminating token
2890 stats.append(toP(F.at(pos).Exec(checkExprStat(t))));
2891 }
2892 return stats;
2893 }
2894
2895 /** ForInit = StatementExpression MoreStatementExpressions
2896 * | { FINAL | '@' Annotation } Type VariableDeclarators
2897 */
2898 List<JCStatement> forInit() {
2899 ListBuffer<JCStatement> stats = new ListBuffer<>();
2900 int pos = token.pos;
2901 if (token.kind == FINAL || token.kind == MONKEYS_AT) {
2902 return variableDeclarators(optFinal(0), parseType(true), stats, true).toList();
2903 } else {
2904 JCExpression t = term(EXPR | TYPE);
2905 if ((lastmode & TYPE) != 0 && LAX_IDENTIFIER.accepts(token.kind)) {
2906 return variableDeclarators(modifiersOpt(), t, stats, true).toList();
2907 } else if ((lastmode & TYPE) != 0 && token.kind == COLON) {
2908 log.error(DiagnosticFlag.SYNTAX, pos, Errors.BadInitializer("for-loop"));
2909 return List.of((JCStatement)F.at(pos).VarDef(modifiersOpt(), names.error, t, null));
2910 } else {
2911 return moreStatementExpressions(pos, t, stats).toList();
2912 }
2913 }
2914 }
2915
2916 /** ForUpdate = StatementExpression MoreStatementExpressions
2917 */
2918 List<JCExpressionStatement> forUpdate() {
2919 return moreStatementExpressions(token.pos,
2920 parseExpression(),
2921 new ListBuffer<JCExpressionStatement>()).toList();
2922 }
2923
2924 /** AnnotationsOpt = { '@' Annotation }
2925 *
2926 * @param kind Whether to parse an ANNOTATION or TYPE_ANNOTATION
2927 */
2928 protected List<JCAnnotation> annotationsOpt(Tag kind) {
2929 if (token.kind != MONKEYS_AT) return List.nil(); // optimization
2930 ListBuffer<JCAnnotation> buf = new ListBuffer<>();
2931 int prevmode = mode;
2932 while (token.kind == MONKEYS_AT) {
2933 int pos = token.pos;
2934 nextToken();
2935 buf.append(annotation(pos, kind));
2936 }
2937 lastmode = mode;
2938 mode = prevmode;
2939 List<JCAnnotation> annotations = buf.toList();
2940
2941 return annotations;
2942 }
2943
2944 List<JCAnnotation> typeAnnotationsOpt() {
2945 List<JCAnnotation> annotations = annotationsOpt(Tag.TYPE_ANNOTATION);
2946 return annotations;
2947 }
2948
2949 /** ModifiersOpt = { Modifier }
2950 * Modifier = PUBLIC | PROTECTED | PRIVATE | STATIC | ABSTRACT | FINAL
2951 * | NATIVE | SYNCHRONIZED | TRANSIENT | VOLATILE | "@"
2952 * | "@" Annotation
2953 */
2954 protected JCModifiers modifiersOpt() {
2955 return modifiersOpt(null);
2956 }
2957 protected JCModifiers modifiersOpt(JCModifiers partial) {
2958 long flags;
2959 ListBuffer<JCAnnotation> annotations = new ListBuffer<>();
2960 int pos;
2961 if (partial == null) {
2962 flags = 0;
2963 pos = token.pos;
2964 } else {
2965 flags = partial.flags;
2966 annotations.appendList(partial.annotations);
2967 pos = partial.pos;
2968 }
2969 if (token.deprecatedFlag()) {
2970 flags |= Flags.DEPRECATED;
2971 }
2972 int lastPos;
2973 loop:
2974 while (true) {
2975 long flag;
2976 switch (token.kind) {
2977 case PRIVATE : flag = Flags.PRIVATE; break;
2978 case PROTECTED : flag = Flags.PROTECTED; break;
2979 case PUBLIC : flag = Flags.PUBLIC; break;
2980 case STATIC : flag = Flags.STATIC; break;
2981 case TRANSIENT : flag = Flags.TRANSIENT; break;
2982 case FINAL : flag = Flags.FINAL; break;
2983 case ABSTRACT : flag = Flags.ABSTRACT; break;
2984 case NATIVE : flag = Flags.NATIVE; break;
2985 case VOLATILE : flag = Flags.VOLATILE; break;
2986 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
2987 case STRICTFP : flag = Flags.STRICTFP; break;
2988 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
2989 case DEFAULT : checkSourceLevel(Feature.DEFAULT_METHODS); flag = Flags.DEFAULT; break;
2990 case ERROR : flag = 0; nextToken(); break;
2991 default: break loop;
2992 }
2993 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
2994 lastPos = token.pos;
2995 nextToken();
2996 if (flag == Flags.ANNOTATION) {
2997 if (token.kind != INTERFACE) {
2998 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
2999 // if first modifier is an annotation, set pos to annotation's.
3000 if (flags == 0 && annotations.isEmpty())
3001 pos = ann.pos;
3002 annotations.append(ann);
3003 flag = 0;
3004 }
3005 }
3006 flags |= flag;
3007 }
3008 switch (token.kind) {
3009 case ENUM: flags |= Flags.ENUM; break;
3010 case INTERFACE: flags |= Flags.INTERFACE; break;
3011 default: break;
3012 }
3013
3014 /* A modifiers tree with no modifier tokens or annotations
3015 * has no text position. */
3016 if ((flags & (Flags.ModifierFlags | Flags.ANNOTATION)) == 0 && annotations.isEmpty())
3017 pos = Position.NOPOS;
3018
3019 JCModifiers mods = F.at(pos).Modifiers(flags, annotations.toList());
3020 if (pos != Position.NOPOS)
3021 storeEnd(mods, S.prevToken().endPos);
3022 return mods;
3023 }
3024
3025 /** Annotation = "@" Qualident [ "(" AnnotationFieldValues ")" ]
3026 *
3027 * @param pos position of "@" token
3028 * @param kind Whether to parse an ANNOTATION or TYPE_ANNOTATION
3029 */
3030 JCAnnotation annotation(int pos, Tag kind) {
3031 // accept(AT); // AT consumed by caller
3032 if (kind == Tag.TYPE_ANNOTATION) {
3033 checkSourceLevel(Feature.TYPE_ANNOTATIONS);
3034 }
3035 JCTree ident = qualident(false);
3036 List<JCExpression> fieldValues = annotationFieldValuesOpt();
3037 JCAnnotation ann;
3038 if (kind == Tag.ANNOTATION) {
3039 ann = F.at(pos).Annotation(ident, fieldValues);
3040 } else if (kind == Tag.TYPE_ANNOTATION) {
3041 ann = F.at(pos).TypeAnnotation(ident, fieldValues);
3042 } else {
3043 throw new AssertionError("Unhandled annotation kind: " + kind);
3044 }
3045
3046 storeEnd(ann, S.prevToken().endPos);
3047 return ann;
3048 }
3049
3050 List<JCExpression> annotationFieldValuesOpt() {
3051 return (token.kind == LPAREN) ? annotationFieldValues() : List.nil();
3052 }
3053
3054 /** AnnotationFieldValues = "(" [ AnnotationFieldValue { "," AnnotationFieldValue } ] ")" */
3055 List<JCExpression> annotationFieldValues() {
3056 accept(LPAREN);
3057 ListBuffer<JCExpression> buf = new ListBuffer<>();
3058 if (token.kind != RPAREN) {
3059 buf.append(annotationFieldValue());
3060 while (token.kind == COMMA) {
3061 nextToken();
3062 buf.append(annotationFieldValue());
3063 }
3064 }
3065 accept(RPAREN);
3066 return buf.toList();
3067 }
3068
3069 /** AnnotationFieldValue = AnnotationValue
3070 * | Identifier "=" AnnotationValue
3071 */
3072 JCExpression annotationFieldValue() {
3073 if (LAX_IDENTIFIER.accepts(token.kind)) {
3074 selectExprMode();
3075 JCExpression t1 = term1();
3076 if (t1.hasTag(IDENT) && token.kind == EQ) {
3077 int pos = token.pos;
3078 accept(EQ);
3079 JCExpression v = annotationValue();
3080 return toP(F.at(pos).Assign(t1, v));
3081 } else {
3082 return t1;
3083 }
3084 }
3085 return annotationValue();
3086 }
3087
3088 /* AnnotationValue = ConditionalExpression
3089 * | Annotation
3090 * | "{" [ AnnotationValue { "," AnnotationValue } ] [","] "}"
3091 */
3092 JCExpression annotationValue() {
3093 int pos;
3094 switch (token.kind) {
3095 case MONKEYS_AT:
3096 pos = token.pos;
3097 nextToken();
3098 return annotation(pos, Tag.ANNOTATION);
3099 case LBRACE:
3100 pos = token.pos;
3101 accept(LBRACE);
3102 ListBuffer<JCExpression> buf = new ListBuffer<>();
3103 if (token.kind == COMMA) {
3104 nextToken();
3105 } else if (token.kind != RBRACE) {
3106 buf.append(annotationValue());
3107 while (token.kind == COMMA) {
3108 nextToken();
3109 if (token.kind == RBRACE) break;
3110 buf.append(annotationValue());
3111 }
3112 }
3113 accept(RBRACE);
3114 return toP(F.at(pos).NewArray(null, List.nil(), buf.toList()));
3115 default:
3116 selectExprMode();
3117 return term1();
3118 }
3119 }
3120
3121 /** VariableDeclarators = VariableDeclarator { "," VariableDeclarator }
3122 */
3123 public <T extends ListBuffer<? super JCVariableDecl>> T variableDeclarators(JCModifiers mods,
3124 JCExpression type,
3125 T vdefs,
3126 boolean localDecl)
3127 {
3128 return variableDeclaratorsRest(token.pos, mods, type, ident(), false, null, vdefs, localDecl);
3129 }
3130
3131 /** VariableDeclaratorsRest = VariableDeclaratorRest { "," VariableDeclarator }
3132 * ConstantDeclaratorsRest = ConstantDeclaratorRest { "," ConstantDeclarator }
3133 *
3134 * @param reqInit Is an initializer always required?
3135 * @param dc The documentation comment for the variable declarations, or null.
3136 */
3137 protected <T extends ListBuffer<? super JCVariableDecl>> T variableDeclaratorsRest(int pos,
3138 JCModifiers mods,
3139 JCExpression type,
3140 Name name,
3141 boolean reqInit,
3142 Comment dc,
3143 T vdefs,
3144 boolean localDecl)
3145 {
3146 JCVariableDecl head = variableDeclaratorRest(pos, mods, type, name, reqInit, dc, localDecl, false);
3147 vdefs.append(head);
3148 while (token.kind == COMMA) {
3149 // All but last of multiple declarators subsume a comma
3150 storeEnd((JCTree)vdefs.last(), token.endPos);
3151 nextToken();
3152 vdefs.append(variableDeclarator(mods, type, reqInit, dc, localDecl));
3153 }
3154 return vdefs;
3155 }
3156
3157 /** VariableDeclarator = Ident VariableDeclaratorRest
3158 * ConstantDeclarator = Ident ConstantDeclaratorRest
3159 */
3160 JCVariableDecl variableDeclarator(JCModifiers mods, JCExpression type, boolean reqInit, Comment dc, boolean localDecl) {
3161 return variableDeclaratorRest(token.pos, mods, type, ident(), reqInit, dc, localDecl, true);
3162 }
3163
3164 /** VariableDeclaratorRest = BracketsOpt ["=" VariableInitializer]
3165 * ConstantDeclaratorRest = BracketsOpt "=" VariableInitializer
3166 *
3167 * @param reqInit Is an initializer always required?
3168 * @param dc The documentation comment for the variable declarations, or null.
3169 */
3170 JCVariableDecl variableDeclaratorRest(int pos, JCModifiers mods, JCExpression type, Name name,
3171 boolean reqInit, Comment dc, boolean localDecl, boolean compound) {
3172 type = bracketsOpt(type);
3173 JCExpression init = null;
3174 if (token.kind == EQ) {
3175 nextToken();
3176 init = variableInitializer();
3177 }
3178 else if (reqInit) syntaxError(token.pos, Errors.Expected(EQ));
3179 JCTree elemType = TreeInfo.innermostType(type, true);
3180 int startPos = Position.NOPOS;
3181 if (elemType.hasTag(IDENT)) {
3182 Name typeName = ((JCIdent)elemType).name;
3183 if (isRestrictedLocalVarTypeName(typeName, pos, !compound && localDecl)) {
3184 if (compound) {
3185 //error - 'var' in compound local var decl
3186 reportSyntaxError(pos, Errors.VarNotAllowedCompound);
3187 } else if (type.hasTag(TYPEARRAY)) {
3188 //error - 'var' and arrays
3189 reportSyntaxError(pos, Errors.VarNotAllowedArray);
3190 } else {
3191 startPos = TreeInfo.getStartPos(mods);
3192 if (startPos == Position.NOPOS)
3193 startPos = TreeInfo.getStartPos(type);
3194 //implicit type
3195 type = null;
3196 }
3197 }
3198 }
3199 JCVariableDecl result =
3200 toP(F.at(pos).VarDef(mods, name, type, init));
3201 attach(result, dc);
3202 result.startPos = startPos;
3203 return result;
3204 }
3205
3206 boolean isRestrictedLocalVarTypeName(JCExpression e, boolean shouldWarn) {
3207 switch (e.getTag()) {
3208 case IDENT:
3209 return isRestrictedLocalVarTypeName(((JCIdent)e).name, e.pos, shouldWarn);
3210 case TYPEARRAY:
3211 return isRestrictedLocalVarTypeName(((JCArrayTypeTree)e).elemtype, shouldWarn);
3212 default:
3213 return false;
3214 }
3215 }
3216
3217 boolean isRestrictedLocalVarTypeName(Name name, int pos, boolean shouldWarn) {
3218 if (name == names.var) {
3219 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3220 return true;
3221 } else if (shouldWarn) {
3222 log.warning(pos, Warnings.VarNotAllowed);
3223 }
3224 }
3225 return false;
3226 }
3227
3228 /** VariableDeclaratorId = Ident BracketsOpt
3229 */
3230 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type) {
3231 return variableDeclaratorId(mods, type, false);
3232 }
3233 //where
3234 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean lambdaParameter) {
3235 int pos = token.pos;
3236 Name name;
3237 if (lambdaParameter && token.kind == UNDERSCORE) {
3238 log.error(pos, Errors.UnderscoreAsIdentifierInLambda);
3239 name = token.name();
3240 nextToken();
3241 } else {
3242 if (allowThisIdent ||
3243 !lambdaParameter ||
3244 LAX_IDENTIFIER.accepts(token.kind) ||
3245 mods.flags != Flags.PARAMETER ||
3246 mods.annotations.nonEmpty()) {
3247 JCExpression pn = qualident(false);
3248 if (pn.hasTag(Tag.IDENT) && ((JCIdent)pn).name != names._this) {
3249 name = ((JCIdent)pn).name;
3250 } else {
3251 if (allowThisIdent) {
3252 if ((mods.flags & Flags.VARARGS) != 0) {
3253 log.error(token.pos, Errors.VarargsAndReceiver);
3254 }
3255 if (token.kind == LBRACKET) {
3256 log.error(token.pos, Errors.ArrayAndReceiver);
3257 }
3258 if (pn.hasTag(Tag.SELECT) && ((JCFieldAccess)pn).name != names._this) {
3259 log.error(token.pos, Errors.WrongReceiver);
3260 }
3261 }
3262 return toP(F.at(pos).ReceiverVarDef(mods, pn, type));
3263 }
3264 } else {
3265 /** if it is a lambda parameter and the token kind is not an identifier,
3266 * and there are no modifiers or annotations, then this means that the compiler
3267 * supposed the lambda to be explicit but it can contain a mix of implicit,
3268 * var or explicit parameters. So we assign the error name to the parameter name
3269 * instead of issuing an error and analyze the lambda parameters as a whole at
3270 * a higher level.
3271 */
3272 name = names.empty;
3273 }
3274 }
3275 if ((mods.flags & Flags.VARARGS) != 0 &&
3276 token.kind == LBRACKET) {
3277 log.error(token.pos, Errors.VarargsAndOldArraySyntax);
3278 }
3279 type = bracketsOpt(type);
3280 return toP(F.at(pos).VarDef(mods, name, type, null));
3281 }
3282
3283 /** Resources = Resource { ";" Resources }
3284 */
3285 List<JCTree> resources() {
3286 ListBuffer<JCTree> defs = new ListBuffer<>();
3287 defs.append(resource());
3288 while (token.kind == SEMI) {
3289 // All but last of multiple declarators must subsume a semicolon
3290 storeEnd(defs.last(), token.endPos);
3291 int semiColonPos = token.pos;
3292 nextToken();
3293 if (token.kind == RPAREN) { // Optional trailing semicolon
3294 // after last resource
3295 break;
3296 }
3297 defs.append(resource());
3298 }
3299 return defs.toList();
3300 }
3301
3302 /** Resource = VariableModifiersOpt Type VariableDeclaratorId "=" Expression
3303 * | Expression
3304 */
3305 protected JCTree resource() {
3306 int startPos = token.pos;
3307 if (token.kind == FINAL || token.kind == MONKEYS_AT) {
3308 JCModifiers mods = optFinal(Flags.FINAL);
3309 JCExpression t = parseType(true);
3310 return variableDeclaratorRest(token.pos, mods, t, ident(), true, null, true, false);
3311 }
3312 JCExpression t = term(EXPR | TYPE);
3313 if ((lastmode & TYPE) != 0 && LAX_IDENTIFIER.accepts(token.kind)) {
3314 JCModifiers mods = toP(F.at(startPos).Modifiers(Flags.FINAL));
3315 return variableDeclaratorRest(token.pos, mods, t, ident(), true, null, true, false);
3316 } else {
3317 checkSourceLevel(Feature.EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES);
3318 if (!t.hasTag(IDENT) && !t.hasTag(SELECT)) {
3319 log.error(t.pos(), Errors.TryWithResourcesExprNeedsVar);
3320 }
3321
3322 return t;
3323 }
3324 }
3325
3326 /** CompilationUnit = [ { "@" Annotation } PACKAGE Qualident ";"] {ImportDeclaration} {TypeDeclaration}
3327 */
3328 public JCTree.JCCompilationUnit parseCompilationUnit() {
3329 Token firstToken = token;
3330 JCModifiers mods = null;
3331 boolean consumedToplevelDoc = false;
3332 boolean seenImport = false;
3333 boolean seenPackage = false;
3334 ListBuffer<JCTree> defs = new ListBuffer<>();
3335 if (token.kind == MONKEYS_AT)
3336 mods = modifiersOpt();
3337
3338 if (token.kind == PACKAGE) {
3339 int packagePos = token.pos;
3340 List<JCAnnotation> annotations = List.nil();
3341 seenPackage = true;
3342 if (mods != null) {
3343 checkNoMods(mods.flags);
3344 annotations = mods.annotations;
3345 mods = null;
3346 }
3347 nextToken();
3348 JCExpression pid = qualident(false);
3349 accept(SEMI);
3350 JCPackageDecl pd = toP(F.at(packagePos).PackageDecl(annotations, pid));
3351 attach(pd, firstToken.comment(CommentStyle.JAVADOC));
3352 consumedToplevelDoc = true;
3353 defs.append(pd);
3354 }
3355
3356 boolean checkForImports = true;
3357 boolean firstTypeDecl = true;
3358 while (token.kind != EOF) {
3359 if (token.pos <= endPosTable.errorEndPos) {
3360 // error recovery
3361 skip(checkForImports, false, false, false);
3362 if (token.kind == EOF)
3363 break;
3364 }
3365 if (checkForImports && mods == null && token.kind == IMPORT) {
3366 seenImport = true;
3367 defs.append(importDeclaration());
3368 } else {
3369 Comment docComment = token.comment(CommentStyle.JAVADOC);
3370 if (firstTypeDecl && !seenImport && !seenPackage) {
3371 docComment = firstToken.comment(CommentStyle.JAVADOC);
3372 consumedToplevelDoc = true;
3373 }
3374 if (mods != null || token.kind != SEMI)
3375 mods = modifiersOpt(mods);
3376 if (firstTypeDecl && token.kind == IDENTIFIER) {
3377 ModuleKind kind = ModuleKind.STRONG;
3378 if (token.name() == names.open) {
3379 kind = ModuleKind.OPEN;
3380 nextToken();
3381 }
3382 if (token.kind == IDENTIFIER && token.name() == names.module) {
3383 if (mods != null) {
3384 checkNoMods(mods.flags & ~Flags.DEPRECATED);
3385 }
3386 defs.append(moduleDecl(mods, kind, docComment));
3387 consumedToplevelDoc = true;
3388 break;
3389 } else if (kind != ModuleKind.STRONG) {
3390 reportSyntaxError(token.pos, Errors.ExpectedModule);
3391 }
3392 }
3393 JCTree def = typeDeclaration(mods, docComment);
3394 if (def instanceof JCExpressionStatement)
3395 def = ((JCExpressionStatement)def).expr;
3396 defs.append(def);
3397 if (def instanceof JCClassDecl)
3398 checkForImports = false;
3399 mods = null;
3400 firstTypeDecl = false;
3401 }
3402 }
3403 JCTree.JCCompilationUnit toplevel = F.at(firstToken.pos).TopLevel(defs.toList());
3404 if (!consumedToplevelDoc)
3405 attach(toplevel, firstToken.comment(CommentStyle.JAVADOC));
3406 if (defs.isEmpty())
3407 storeEnd(toplevel, S.prevToken().endPos);
3408 if (keepDocComments)
3409 toplevel.docComments = docComments;
3410 if (keepLineMap)
3411 toplevel.lineMap = S.getLineMap();
3412 this.endPosTable.setParser(null); // remove reference to parser
3413 toplevel.endPositions = this.endPosTable;
3414 return toplevel;
3415 }
3416
3417 JCModuleDecl moduleDecl(JCModifiers mods, ModuleKind kind, Comment dc) {
3418 int pos = token.pos;
3419 checkSourceLevel(Feature.MODULES);
3420
3421 nextToken();
3422 JCExpression name = qualident(false);
3423 List<JCDirective> directives = null;
3424
3425 accept(LBRACE);
3426 directives = moduleDirectiveList();
3427 accept(RBRACE);
3428 accept(EOF);
3429
3430 JCModuleDecl result = toP(F.at(pos).ModuleDef(mods, kind, name, directives));
3431 attach(result, dc);
3432 return result;
3433 }
3434
3435 List<JCDirective> moduleDirectiveList() {
3436 ListBuffer<JCDirective> defs = new ListBuffer<>();
3437 while (token.kind == IDENTIFIER) {
3438 int pos = token.pos;
3439 if (token.name() == names.requires) {
3440 nextToken();
3441 boolean isTransitive = false;
3442 boolean isStaticPhase = false;
3443 loop:
3444 while (true) {
3445 switch (token.kind) {
3446 case IDENTIFIER:
3447 if (token.name() == names.transitive && !isTransitive) {
3448 Token t1 = S.token(1);
3449 if (t1.kind == SEMI || t1.kind == DOT) {
3450 break loop;
3451 }
3452 isTransitive = true;
3453 break;
3454 } else {
3455 break loop;
3456 }
3457 case STATIC:
3458 if (isStaticPhase) {
3459 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3460 }
3461 isStaticPhase = true;
3462 break;
3463 default:
3464 break loop;
3465 }
3466 nextToken();
3467 }
3468 JCExpression moduleName = qualident(false);
3469 accept(SEMI);
3470 defs.append(toP(F.at(pos).Requires(isTransitive, isStaticPhase, moduleName)));
3471 } else if (token.name() == names.exports || token.name() == names.opens) {
3472 boolean exports = token.name() == names.exports;
3473 nextToken();
3474 JCExpression pkgName = qualident(false);
3475 List<JCExpression> moduleNames = null;
3476 if (token.kind == IDENTIFIER && token.name() == names.to) {
3477 nextToken();
3478 moduleNames = qualidentList(false);
3479 }
3480 accept(SEMI);
3481 JCDirective d;
3482 if (exports) {
3483 d = F.at(pos).Exports(pkgName, moduleNames);
3484 } else {
3485 d = F.at(pos).Opens(pkgName, moduleNames);
3486 }
3487 defs.append(toP(d));
3488 } else if (token.name() == names.provides) {
3489 nextToken();
3490 JCExpression serviceName = qualident(false);
3491 if (token.kind == IDENTIFIER && token.name() == names.with) {
3492 nextToken();
3493 List<JCExpression> implNames = qualidentList(false);
3494 accept(SEMI);
3495 defs.append(toP(F.at(pos).Provides(serviceName, implNames)));
3496 } else {
3497 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.ExpectedStr("'" + names.with + "'"));
3498 skip(false, false, false, false);
3499 }
3500 } else if (token.name() == names.uses) {
3501 nextToken();
3502 JCExpression service = qualident(false);
3503 accept(SEMI);
3504 defs.append(toP(F.at(pos).Uses(service)));
3505 } else {
3506 setErrorEndPos(pos);
3507 reportSyntaxError(pos, Errors.InvalidModuleDirective);
3508 break;
3509 }
3510 }
3511 return defs.toList();
3512 }
3513
3514 /** ImportDeclaration = IMPORT [ STATIC ] Ident { "." Ident } [ "." "*" ] ";"
3515 */
3516 protected JCTree importDeclaration() {
3517 int pos = token.pos;
3518 nextToken();
3519 boolean importStatic = false;
3520 if (token.kind == STATIC) {
3521 importStatic = true;
3522 nextToken();
3523 }
3524 JCExpression pid = toP(F.at(token.pos).Ident(ident()));
3525 do {
3526 int pos1 = token.pos;
3527 accept(DOT);
3528 if (token.kind == STAR) {
3529 pid = to(F.at(pos1).Select(pid, names.asterisk));
3530 nextToken();
3531 break;
3532 } else {
3533 pid = toP(F.at(pos1).Select(pid, ident()));
3534 }
3535 } while (token.kind == DOT);
3536 accept(SEMI);
3537 return toP(F.at(pos).Import(pid, importStatic));
3538 }
3539
3540 /** TypeDeclaration = ClassOrInterfaceOrEnumDeclaration
3541 * | ";"
3542 */
3543 JCTree typeDeclaration(JCModifiers mods, Comment docComment) {
3544 int pos = token.pos;
3545 if (mods == null && token.kind == SEMI) {
3546 nextToken();
3547 return toP(F.at(pos).Skip());
3548 } else {
3549 return classOrInterfaceOrEnumDeclaration(modifiersOpt(mods), docComment);
3550 }
3551 }
3552
3553 /** ClassOrInterfaceOrEnumDeclaration = ModifiersOpt
3554 * (ClassDeclaration | InterfaceDeclaration | EnumDeclaration)
3555 * @param mods Any modifiers starting the class or interface declaration
3556 * @param dc The documentation comment for the class, or null.
3557 */
3558 protected JCStatement classOrInterfaceOrEnumDeclaration(JCModifiers mods, Comment dc) {
3559 if (token.kind == CLASS) {
3560 return classDeclaration(mods, dc);
3561 } else if (token.kind == INTERFACE) {
3562 return interfaceDeclaration(mods, dc);
3563 } else if (token.kind == ENUM) {
3564 return enumDeclaration(mods, dc);
3565 } else {
3566 int pos = token.pos;
3567 List<JCTree> errs;
3568 if (LAX_IDENTIFIER.accepts(token.kind)) {
3569 errs = List.of(mods, toP(F.at(pos).Ident(ident())));
3570 setErrorEndPos(token.pos);
3571 } else {
3572 errs = List.of(mods);
3573 }
3574 final JCErroneous erroneousTree;
3575 if (parseModuleInfo) {
3576 erroneousTree = syntaxError(pos, errs, Errors.ExpectedModuleOrOpen);
3577 } else {
3578 erroneousTree = syntaxError(pos, errs, Errors.Expected3(CLASS, INTERFACE, ENUM));
3579 }
3580 return toP(F.Exec(erroneousTree));
3581 }
3582 }
3583
3584 /** ClassDeclaration = CLASS Ident TypeParametersOpt [EXTENDS Type]
3585 * [IMPLEMENTS TypeList] ClassBody
3586 * @param mods The modifiers starting the class declaration
3587 * @param dc The documentation comment for the class, or null.
3588 */
3589 protected JCClassDecl classDeclaration(JCModifiers mods, Comment dc) {
3590 int pos = token.pos;
3591 accept(CLASS);
3592 Name name = typeName();
3593
3594 List<JCTypeParameter> typarams = typeParametersOpt();
3595
3596 JCExpression extending = null;
3597 if (token.kind == EXTENDS) {
3598 nextToken();
3599 extending = parseType();
3600 }
3601 List<JCExpression> implementing = List.nil();
3602 if (token.kind == IMPLEMENTS) {
3603 nextToken();
3604 implementing = typeList();
3605 }
3606 List<JCTree> defs = classOrInterfaceBody(name, false);
3607 JCClassDecl result = toP(F.at(pos).ClassDef(
3608 mods, name, typarams, extending, implementing, defs));
3609 attach(result, dc);
3610 return result;
3611 }
3612
3613 Name typeName() {
3614 int pos = token.pos;
3615 Name name = ident();
3616 if (isRestrictedLocalVarTypeName(name, pos, true)) {
3617 reportSyntaxError(pos, Errors.VarNotAllowed);
3618 }
3619 return name;
3620 }
3621
3622 /** InterfaceDeclaration = INTERFACE Ident TypeParametersOpt
3623 * [EXTENDS TypeList] InterfaceBody
3624 * @param mods The modifiers starting the interface declaration
3625 * @param dc The documentation comment for the interface, or null.
3626 */
3627 protected JCClassDecl interfaceDeclaration(JCModifiers mods, Comment dc) {
3628 int pos = token.pos;
3629 accept(INTERFACE);
3630
3631 Name name = typeName();
3632
3633 List<JCTypeParameter> typarams = typeParametersOpt();
3634
3635 List<JCExpression> extending = List.nil();
3636 if (token.kind == EXTENDS) {
3637 nextToken();
3638 extending = typeList();
3639 }
3640 List<JCTree> defs = classOrInterfaceBody(name, true);
3641 JCClassDecl result = toP(F.at(pos).ClassDef(
3642 mods, name, typarams, null, extending, defs));
3643 attach(result, dc);
3644 return result;
3645 }
3646
3647 /** EnumDeclaration = ENUM Ident [IMPLEMENTS TypeList] EnumBody
3648 * @param mods The modifiers starting the enum declaration
3649 * @param dc The documentation comment for the enum, or null.
3650 */
3651 protected JCClassDecl enumDeclaration(JCModifiers mods, Comment dc) {
3652 int pos = token.pos;
3653 accept(ENUM);
3654
3655 Name name = typeName();
3656
3657 List<JCExpression> implementing = List.nil();
3658 if (token.kind == IMPLEMENTS) {
3659 nextToken();
3660 implementing = typeList();
3661 }
3662
3663 List<JCTree> defs = enumBody(name);
3664 mods.flags |= Flags.ENUM;
3665 JCClassDecl result = toP(F.at(pos).
3666 ClassDef(mods, name, List.nil(),
3667 null, implementing, defs));
3668 attach(result, dc);
3669 return result;
3670 }
3671
3672 /** EnumBody = "{" { EnumeratorDeclarationList } [","]
3673 * [ ";" {ClassBodyDeclaration} ] "}"
3674 */
3675 List<JCTree> enumBody(Name enumName) {
3676 accept(LBRACE);
3677 ListBuffer<JCTree> defs = new ListBuffer<>();
3678 if (token.kind == COMMA) {
3679 nextToken();
3680 } else if (token.kind != RBRACE && token.kind != SEMI) {
3681 defs.append(enumeratorDeclaration(enumName));
3682 while (token.kind == COMMA) {
3683 nextToken();
3684 if (token.kind == RBRACE || token.kind == SEMI) break;
3685 defs.append(enumeratorDeclaration(enumName));
3686 }
3687 if (token.kind != SEMI && token.kind != RBRACE) {
3688 defs.append(syntaxError(token.pos, Errors.Expected3(COMMA, RBRACE, SEMI)));
3689 nextToken();
3690 }
3691 }
3692 if (token.kind == SEMI) {
3693 nextToken();
3694 while (token.kind != RBRACE && token.kind != EOF) {
3695 defs.appendList(classOrInterfaceBodyDeclaration(enumName,
3696 false));
3697 if (token.pos <= endPosTable.errorEndPos) {
3698 // error recovery
3699 skip(false, true, true, false);
3700 }
3701 }
3702 }
3703 accept(RBRACE);
3704 return defs.toList();
3705 }
3706
3707 /** EnumeratorDeclaration = AnnotationsOpt [TypeArguments] IDENTIFIER [ Arguments ] [ "{" ClassBody "}" ]
3708 */
3709 JCTree enumeratorDeclaration(Name enumName) {
3710 Comment dc = token.comment(CommentStyle.JAVADOC);
3711 int flags = Flags.PUBLIC|Flags.STATIC|Flags.FINAL|Flags.ENUM;
3712 if (token.deprecatedFlag()) {
3713 flags |= Flags.DEPRECATED;
3714 }
3715 int pos = token.pos;
3716 List<JCAnnotation> annotations = annotationsOpt(Tag.ANNOTATION);
3717 JCModifiers mods = F.at(annotations.isEmpty() ? Position.NOPOS : pos).Modifiers(flags, annotations);
3718 List<JCExpression> typeArgs = typeArgumentsOpt();
3719 int identPos = token.pos;
3720 Name name = ident();
3721 int createPos = token.pos;
3722 List<JCExpression> args = (token.kind == LPAREN)
3723 ? arguments() : List.nil();
3724 JCClassDecl body = null;
3725 if (token.kind == LBRACE) {
3726 JCModifiers mods1 = F.at(Position.NOPOS).Modifiers(Flags.ENUM);
3727 List<JCTree> defs = classOrInterfaceBody(names.empty, false);
3728 body = toP(F.at(identPos).AnonymousClassDef(mods1, defs));
3729 }
3730 if (args.isEmpty() && body == null)
3731 createPos = identPos;
3732 JCIdent ident = F.at(identPos).Ident(enumName);
3733 JCNewClass create = F.at(createPos).NewClass(null, typeArgs, ident, args, body);
3734 if (createPos != identPos)
3735 storeEnd(create, S.prevToken().endPos);
3736 ident = F.at(identPos).Ident(enumName);
3737 JCTree result = toP(F.at(pos).VarDef(mods, name, ident, create));
3738 attach(result, dc);
3739 return result;
3740 }
3741
3742 /** TypeList = Type {"," Type}
3743 */
3744 List<JCExpression> typeList() {
3745 ListBuffer<JCExpression> ts = new ListBuffer<>();
3746 ts.append(parseType());
3747 while (token.kind == COMMA) {
3748 nextToken();
3749 ts.append(parseType());
3750 }
3751 return ts.toList();
3752 }
3753
3754 /** ClassBody = "{" {ClassBodyDeclaration} "}"
3755 * InterfaceBody = "{" {InterfaceBodyDeclaration} "}"
3756 */
3757 List<JCTree> classOrInterfaceBody(Name className, boolean isInterface) {
3758 accept(LBRACE);
3759 if (token.pos <= endPosTable.errorEndPos) {
3760 // error recovery
3761 skip(false, true, false, false);
3762 if (token.kind == LBRACE)
3763 nextToken();
3764 }
3765 ListBuffer<JCTree> defs = new ListBuffer<>();
3766 while (token.kind != RBRACE && token.kind != EOF) {
3767 defs.appendList(classOrInterfaceBodyDeclaration(className, isInterface));
3768 if (token.pos <= endPosTable.errorEndPos) {
3769 // error recovery
3770 skip(false, true, true, false);
3771 }
3772 }
3773 accept(RBRACE);
3774 return defs.toList();
3775 }
3776
3777 /** ClassBodyDeclaration =
3778 * ";"
3779 * | [STATIC] Block
3780 * | ModifiersOpt
3781 * ( Type Ident
3782 * ( VariableDeclaratorsRest ";" | MethodDeclaratorRest )
3783 * | VOID Ident VoidMethodDeclaratorRest
3784 * | TypeParameters [Annotations]
3785 * ( Type Ident MethodDeclaratorRest
3786 * | VOID Ident VoidMethodDeclaratorRest
3787 * )
3788 * | Ident ConstructorDeclaratorRest
3789 * | TypeParameters Ident ConstructorDeclaratorRest
3790 * | ClassOrInterfaceOrEnumDeclaration
3791 * )
3792 * InterfaceBodyDeclaration =
3793 * ";"
3794 * | ModifiersOpt
3795 * ( Type Ident
3796 * ( ConstantDeclaratorsRest ";" | MethodDeclaratorRest )
3797 * | VOID Ident MethodDeclaratorRest
3798 * | TypeParameters [Annotations]
3799 * ( Type Ident MethodDeclaratorRest
3800 * | VOID Ident VoidMethodDeclaratorRest
3801 * )
3802 * | ClassOrInterfaceOrEnumDeclaration
3803 * )
3804 *
3805 */
3806 protected List<JCTree> classOrInterfaceBodyDeclaration(Name className, boolean isInterface) {
3807 if (token.kind == SEMI) {
3808 nextToken();
3809 return List.nil();
3810 } else {
3811 Comment dc = token.comment(CommentStyle.JAVADOC);
3812 int pos = token.pos;
3813 JCModifiers mods = modifiersOpt();
3814 if (token.kind == CLASS ||
3815 token.kind == INTERFACE ||
3816 token.kind == ENUM) {
3817 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
3818 } else if (token.kind == LBRACE &&
3819 (mods.flags & Flags.StandardFlags & ~Flags.STATIC) == 0 &&
3820 mods.annotations.isEmpty()) {
3821 if (isInterface) {
3822 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.InitializerNotAllowed);
3823 }
3824 return List.of(block(pos, mods.flags));
3825 } else {
3826 pos = token.pos;
3827 List<JCTypeParameter> typarams = typeParametersOpt();
3828 // if there are type parameters but no modifiers, save the start
3829 // position of the method in the modifiers.
3830 if (typarams.nonEmpty() && mods.pos == Position.NOPOS) {
3831 mods.pos = pos;
3832 storeEnd(mods, pos);
3833 }
3834 List<JCAnnotation> annosAfterParams = annotationsOpt(Tag.ANNOTATION);
3835
3836 if (annosAfterParams.nonEmpty()) {
3837 checkSourceLevel(annosAfterParams.head.pos, Feature.ANNOTATIONS_AFTER_TYPE_PARAMS);
3838 mods.annotations = mods.annotations.appendList(annosAfterParams);
3839 if (mods.pos == Position.NOPOS)
3840 mods.pos = mods.annotations.head.pos;
3841 }
3842
3843 Token tk = token;
3844 pos = token.pos;
3845 JCExpression type;
3846 boolean isVoid = token.kind == VOID;
3847 if (isVoid) {
3848 type = to(F.at(pos).TypeIdent(TypeTag.VOID));
3849 nextToken();
3850 } else {
3851 // method returns types are un-annotated types
3852 type = unannotatedType(false);
3853 }
3854 if (token.kind == LPAREN && !isInterface && type.hasTag(IDENT)) {
3855 if (isInterface || tk.name() != className)
3856 log.error(DiagnosticFlag.SYNTAX, pos, Errors.InvalidMethDeclRetTypeReq);
3857 else if (annosAfterParams.nonEmpty())
3858 illegal(annosAfterParams.head.pos);
3859 return List.of(methodDeclaratorRest(
3860 pos, mods, null, names.init, typarams,
3861 isInterface, true, dc));
3862 } else {
3863 pos = token.pos;
3864 Name name = ident();
3865 if (token.kind == LPAREN) {
3866 return List.of(methodDeclaratorRest(
3867 pos, mods, type, name, typarams,
3868 isInterface, isVoid, dc));
3869 } else if (!isVoid && typarams.isEmpty()) {
3870 List<JCTree> defs =
3871 variableDeclaratorsRest(pos, mods, type, name, isInterface, dc,
3872 new ListBuffer<JCTree>(), false).toList();
3873 accept(SEMI);
3874 storeEnd(defs.last(), S.prevToken().endPos);
3875 return defs;
3876 } else {
3877 pos = token.pos;
3878 List<JCTree> err;
3879 if (isVoid || typarams.nonEmpty()) {
3880 JCMethodDecl m =
3881 toP(F.at(pos).MethodDef(mods, name, type, typarams,
3882 List.nil(), List.nil(), null, null));
3883 attach(m, dc);
3884 err = List.of(m);
3885 } else {
3886 err = List.nil();
3887 }
3888 return List.of(syntaxError(token.pos, err, Errors.Expected(LPAREN)));
3889 }
3890 }
3891 }
3892 }
3893 }
3894
3895 /** MethodDeclaratorRest =
3896 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
3897 * VoidMethodDeclaratorRest =
3898 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
3899 * ConstructorDeclaratorRest =
3900 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
3901 */
3902 protected JCTree methodDeclaratorRest(int pos,
3903 JCModifiers mods,
3904 JCExpression type,
3905 Name name,
3906 List<JCTypeParameter> typarams,
3907 boolean isInterface, boolean isVoid,
3908 Comment dc) {
3909 if (isInterface) {
3910 if ((mods.flags & Flags.STATIC) != 0) {
3911 checkSourceLevel(Feature.STATIC_INTERFACE_METHODS);
3912 }
3913 if ((mods.flags & Flags.PRIVATE) != 0) {
3914 checkSourceLevel(Feature.PRIVATE_INTERFACE_METHODS);
3915 }
3916 }
3917 JCVariableDecl prevReceiverParam = this.receiverParam;
3918 try {
3919 this.receiverParam = null;
3920 // Parsing formalParameters sets the receiverParam, if present
3921 List<JCVariableDecl> params = formalParameters();
3922 if (!isVoid) type = bracketsOpt(type);
3923 List<JCExpression> thrown = List.nil();
3924 if (token.kind == THROWS) {
3925 nextToken();
3926 thrown = qualidentList(true);
3927 }
3928 JCBlock body = null;
3929 JCExpression defaultValue;
3930 if (token.kind == LBRACE) {
3931 body = block();
3932 defaultValue = null;
3933 } else {
3934 if (token.kind == DEFAULT) {
3935 accept(DEFAULT);
3936 defaultValue = annotationValue();
3937 } else {
3938 defaultValue = null;
3939 }
3940 accept(SEMI);
3941 if (token.pos <= endPosTable.errorEndPos) {
3942 // error recovery
3943 skip(false, true, false, false);
3944 if (token.kind == LBRACE) {
3945 body = block();
3946 }
3947 }
3948 }
3949
3950 JCMethodDecl result =
3951 toP(F.at(pos).MethodDef(mods, name, type, typarams,
3952 receiverParam, params, thrown,
3953 body, defaultValue));
3954 attach(result, dc);
3955 return result;
3956 } finally {
3957 this.receiverParam = prevReceiverParam;
3958 }
3959 }
3960
3961 /** QualidentList = [Annotations] Qualident {"," [Annotations] Qualident}
3962 */
3963 List<JCExpression> qualidentList(boolean allowAnnos) {
3964 ListBuffer<JCExpression> ts = new ListBuffer<>();
3965
3966 List<JCAnnotation> typeAnnos = allowAnnos ? typeAnnotationsOpt() : List.nil();
3967 JCExpression qi = qualident(allowAnnos);
3968 if (!typeAnnos.isEmpty()) {
3969 JCExpression at = insertAnnotationsToMostInner(qi, typeAnnos, false);
3970 ts.append(at);
3971 } else {
3972 ts.append(qi);
3973 }
3974 while (token.kind == COMMA) {
3975 nextToken();
3976
3977 typeAnnos = allowAnnos ? typeAnnotationsOpt() : List.nil();
3978 qi = qualident(allowAnnos);
3979 if (!typeAnnos.isEmpty()) {
3980 JCExpression at = insertAnnotationsToMostInner(qi, typeAnnos, false);
3981 ts.append(at);
3982 } else {
3983 ts.append(qi);
3984 }
3985 }
3986 return ts.toList();
3987 }
3988
3989 /**
3990 * {@literal
3991 * TypeParametersOpt = ["<" TypeParameter {"," TypeParameter} ">"]
3992 * }
3993 */
3994 protected List<JCTypeParameter> typeParametersOpt() {
3995 if (token.kind == LT) {
3996 ListBuffer<JCTypeParameter> typarams = new ListBuffer<>();
3997 nextToken();
3998 typarams.append(typeParameter());
3999 while (token.kind == COMMA) {
4000 nextToken();
4001 typarams.append(typeParameter());
4002 }
4003 accept(GT);
4004 return typarams.toList();
4005 } else {
4006 return List.nil();
4007 }
4008 }
4009
4010 /**
4011 * {@literal
4012 * TypeParameter = [Annotations] TypeVariable [TypeParameterBound]
4013 * TypeParameterBound = EXTENDS Type {"&" Type}
4014 * TypeVariable = Ident
4015 * }
4016 */
4017 JCTypeParameter typeParameter() {
4018 int pos = token.pos;
4019 List<JCAnnotation> annos = typeAnnotationsOpt();
4020 Name name = typeName();
4021 ListBuffer<JCExpression> bounds = new ListBuffer<>();
4022 if (token.kind == EXTENDS) {
4023 nextToken();
4024 bounds.append(parseType());
4025 while (token.kind == AMP) {
4026 nextToken();
4027 bounds.append(parseType());
4028 }
4029 }
4030 return toP(F.at(pos).TypeParameter(name, bounds.toList(), annos));
4031 }
4032
4033 /** FormalParameters = "(" [ FormalParameterList ] ")"
4034 * FormalParameterList = [ FormalParameterListNovarargs , ] LastFormalParameter
4035 * FormalParameterListNovarargs = [ FormalParameterListNovarargs , ] FormalParameter
4036 */
4037 List<JCVariableDecl> formalParameters() {
4038 return formalParameters(false);
4039 }
4040 List<JCVariableDecl> formalParameters(boolean lambdaParameters) {
4041 ListBuffer<JCVariableDecl> params = new ListBuffer<>();
4042 JCVariableDecl lastParam;
4043 accept(LPAREN);
4044 if (token.kind != RPAREN) {
4045 this.allowThisIdent = !lambdaParameters;
4046 lastParam = formalParameter(lambdaParameters);
4047 if (lastParam.nameexpr != null) {
4048 this.receiverParam = lastParam;
4049 } else {
4050 params.append(lastParam);
4051 }
4052 this.allowThisIdent = false;
4053 while (token.kind == COMMA) {
4054 if ((lastParam.mods.flags & Flags.VARARGS) != 0) {
4055 log.error(DiagnosticFlag.SYNTAX, lastParam, Errors.VarargsMustBeLast);
4056 }
4057 nextToken();
4058 params.append(lastParam = formalParameter(lambdaParameters));
4059 }
4060 }
4061 if (token.kind == RPAREN) {
4062 nextToken();
4063 } else {
4064 setErrorEndPos(token.pos);
4065 reportSyntaxError(S.prevToken().endPos, Errors.Expected3(COMMA, RPAREN, LBRACKET));
4066 }
4067 return params.toList();
4068 }
4069
4070 List<JCVariableDecl> implicitParameters(boolean hasParens) {
4071 if (hasParens) {
4072 accept(LPAREN);
4073 }
4074 ListBuffer<JCVariableDecl> params = new ListBuffer<>();
4075 if (token.kind != RPAREN && token.kind != ARROW) {
4076 params.append(implicitParameter());
4077 while (token.kind == COMMA) {
4078 nextToken();
4079 params.append(implicitParameter());
4080 }
4081 }
4082 if (hasParens) {
4083 accept(RPAREN);
4084 }
4085 return params.toList();
4086 }
4087
4088 JCModifiers optFinal(long flags) {
4089 JCModifiers mods = modifiersOpt();
4090 checkNoMods(mods.flags & ~(Flags.FINAL | Flags.DEPRECATED));
4091 mods.flags |= flags;
4092 return mods;
4093 }
4094
4095 /**
4096 * Inserts the annotations (and possibly a new array level)
4097 * to the left-most type in an array or nested type.
4098 *
4099 * When parsing a type like {@code @B Outer.Inner @A []}, the
4100 * {@code @A} annotation should target the array itself, while
4101 * {@code @B} targets the nested type {@code Outer}.
4102 *
4103 * Currently the parser parses the annotation first, then
4104 * the array, and then inserts the annotation to the left-most
4105 * nested type.
4106 *
4107 * When {@code createNewLevel} is true, then a new array
4108 * level is inserted as the most inner type, and have the
4109 * annotations target it. This is useful in the case of
4110 * varargs, e.g. {@code String @A [] @B ...}, as the parser
4111 * first parses the type {@code String @A []} then inserts
4112 * a new array level with {@code @B} annotation.
4113 */
4114 private JCExpression insertAnnotationsToMostInner(
4115 JCExpression type, List<JCAnnotation> annos,
4116 boolean createNewLevel) {
4117 int origEndPos = getEndPos(type);
4118 JCExpression mostInnerType = type;
4119 JCArrayTypeTree mostInnerArrayType = null;
4120 while (TreeInfo.typeIn(mostInnerType).hasTag(TYPEARRAY)) {
4121 mostInnerArrayType = (JCArrayTypeTree) TreeInfo.typeIn(mostInnerType);
4122 mostInnerType = mostInnerArrayType.elemtype;
4123 }
4124
4125 if (createNewLevel) {
4126 mostInnerType = to(F.at(token.pos).TypeArray(mostInnerType));
4127 }
4128
4129 JCExpression mostInnerTypeToReturn = mostInnerType;
4130 if (annos.nonEmpty()) {
4131 JCExpression lastToModify = mostInnerType;
4132
4133 while (TreeInfo.typeIn(mostInnerType).hasTag(SELECT) ||
4134 TreeInfo.typeIn(mostInnerType).hasTag(TYPEAPPLY)) {
4135 while (TreeInfo.typeIn(mostInnerType).hasTag(SELECT)) {
4136 lastToModify = mostInnerType;
4137 mostInnerType = ((JCFieldAccess) TreeInfo.typeIn(mostInnerType)).getExpression();
4138 }
4139 while (TreeInfo.typeIn(mostInnerType).hasTag(TYPEAPPLY)) {
4140 lastToModify = mostInnerType;
4141 mostInnerType = ((JCTypeApply) TreeInfo.typeIn(mostInnerType)).clazz;
4142 }
4143 }
4144
4145 mostInnerType = F.at(annos.head.pos).AnnotatedType(annos, mostInnerType);
4146
4147 if (TreeInfo.typeIn(lastToModify).hasTag(TYPEAPPLY)) {
4148 ((JCTypeApply) TreeInfo.typeIn(lastToModify)).clazz = mostInnerType;
4149 } else if (TreeInfo.typeIn(lastToModify).hasTag(SELECT)) {
4150 ((JCFieldAccess) TreeInfo.typeIn(lastToModify)).selected = mostInnerType;
4151 } else {
4152 // We never saw a SELECT or TYPEAPPLY, return the annotated type.
4153 mostInnerTypeToReturn = mostInnerType;
4154 }
4155 }
4156
4157 if (mostInnerArrayType == null) {
4158 return mostInnerTypeToReturn;
4159 } else {
4160 mostInnerArrayType.elemtype = mostInnerTypeToReturn;
4161 storeEnd(type, origEndPos);
4162 return type;
4163 }
4164 }
4165
4166 /** FormalParameter = { FINAL | '@' Annotation } Type VariableDeclaratorId
4167 * LastFormalParameter = { FINAL | '@' Annotation } Type '...' Ident | FormalParameter
4168 */
4169 protected JCVariableDecl formalParameter() {
4170 return formalParameter(false);
4171 }
4172 protected JCVariableDecl formalParameter(boolean lambdaParameter) {
4173 JCModifiers mods = optFinal(Flags.PARAMETER);
4174 // need to distinguish between vararg annos and array annos
4175 // look at typeAnnotationsPushedBack comment
4176 this.permitTypeAnnotationsPushBack = true;
4177 JCExpression type = parseType(lambdaParameter);
4178 this.permitTypeAnnotationsPushBack = false;
4179
4180 if (token.kind == ELLIPSIS) {
4181 List<JCAnnotation> varargsAnnos = typeAnnotationsPushedBack;
4182 typeAnnotationsPushedBack = List.nil();
4183 mods.flags |= Flags.VARARGS;
4184 // insert var arg type annotations
4185 type = insertAnnotationsToMostInner(type, varargsAnnos, true);
4186 nextToken();
4187 } else {
4188 // if not a var arg, then typeAnnotationsPushedBack should be null
4189 if (typeAnnotationsPushedBack.nonEmpty()) {
4190 reportSyntaxError(typeAnnotationsPushedBack.head.pos, Errors.IllegalStartOfType);
4191 }
4192 typeAnnotationsPushedBack = List.nil();
4193 }
4194 return variableDeclaratorId(mods, type, lambdaParameter);
4195 }
4196
4197 protected JCVariableDecl implicitParameter() {
4198 JCModifiers mods = F.at(token.pos).Modifiers(Flags.PARAMETER);
4199 return variableDeclaratorId(mods, null, true);
4200 }
4201
4202 /* ---------- auxiliary methods -------------- */
4203 /** Check that given tree is a legal expression statement.
4204 */
4205 protected JCExpression checkExprStat(JCExpression t) {
4206 if (!TreeInfo.isExpressionStatement(t)) {
4207 JCExpression ret = F.at(t.pos).Erroneous(List.<JCTree>of(t));
4208 log.error(DiagnosticFlag.SYNTAX, ret, Errors.NotStmt);
4209 return ret;
4210 } else {
4211 return t;
4212 }
4213 }
4214
4215 /** Return precedence of operator represented by token,
4216 * -1 if token is not a binary operator. @see TreeInfo.opPrec
4217 */
4218 static int prec(TokenKind token) {
4219 JCTree.Tag oc = optag(token);
4220 return (oc != NO_TAG) ? TreeInfo.opPrec(oc) : -1;
4221 }
4222
4223 /**
4224 * Return the lesser of two positions, making allowance for either one
4225 * being unset.
4226 */
4227 static int earlier(int pos1, int pos2) {
4228 if (pos1 == Position.NOPOS)
4229 return pos2;
4230 if (pos2 == Position.NOPOS)
4231 return pos1;
4232 return (pos1 < pos2 ? pos1 : pos2);
4233 }
4234
4235 /** Return operation tag of binary operator represented by token,
4236 * No_TAG if token is not a binary operator.
4237 */
4238 static JCTree.Tag optag(TokenKind token) {
4239 switch (token) {
4240 case BARBAR:
4241 return OR;
4242 case AMPAMP:
4243 return AND;
4244 case BAR:
4245 return BITOR;
4246 case BAREQ:
4247 return BITOR_ASG;
4248 case CARET:
4249 return BITXOR;
4250 case CARETEQ:
4251 return BITXOR_ASG;
4252 case AMP:
4253 return BITAND;
4254 case AMPEQ:
4255 return BITAND_ASG;
4256 case EQEQ:
4257 return JCTree.Tag.EQ;
4258 case BANGEQ:
4259 return NE;
4260 case LT:
4261 return JCTree.Tag.LT;
4262 case GT:
4263 return JCTree.Tag.GT;
4264 case LTEQ:
4265 return LE;
4266 case GTEQ:
4267 return GE;
4268 case LTLT:
4269 return SL;
4270 case LTLTEQ:
4271 return SL_ASG;
4272 case GTGT:
4273 return SR;
4274 case GTGTEQ:
4275 return SR_ASG;
4276 case GTGTGT:
4277 return USR;
4278 case GTGTGTEQ:
4279 return USR_ASG;
4280 case PLUS:
4281 return JCTree.Tag.PLUS;
4282 case PLUSEQ:
4283 return PLUS_ASG;
4284 case SUB:
4285 return MINUS;
4286 case SUBEQ:
4287 return MINUS_ASG;
4288 case STAR:
4289 return MUL;
4290 case STAREQ:
4291 return MUL_ASG;
4292 case SLASH:
4293 return DIV;
4294 case SLASHEQ:
4295 return DIV_ASG;
4296 case PERCENT:
4297 return MOD;
4298 case PERCENTEQ:
4299 return MOD_ASG;
4300 case INSTANCEOF:
4301 return TYPETEST;
4302 default:
4303 return NO_TAG;
4304 }
4305 }
4306
4307 /** Return operation tag of unary operator represented by token,
4308 * No_TAG if token is not a binary operator.
4309 */
4310 static JCTree.Tag unoptag(TokenKind token) {
4311 switch (token) {
4312 case PLUS:
4313 return POS;
4314 case SUB:
4315 return NEG;
4316 case BANG:
4317 return NOT;
4318 case TILDE:
4319 return COMPL;
4320 case PLUSPLUS:
4321 return PREINC;
4322 case SUBSUB:
4323 return PREDEC;
4324 default:
4325 return NO_TAG;
4326 }
4327 }
4328
4329 /** Return type tag of basic type represented by token,
4330 * NONE if token is not a basic type identifier.
4331 */
4332 static TypeTag typetag(TokenKind token) {
4333 switch (token) {
4334 case BYTE:
4335 return TypeTag.BYTE;
4336 case CHAR:
4337 return TypeTag.CHAR;
4338 case SHORT:
4339 return TypeTag.SHORT;
4340 case INT:
4341 return TypeTag.INT;
4342 case LONG:
4343 return TypeTag.LONG;
4344 case FLOAT:
4345 return TypeTag.FLOAT;
4346 case DOUBLE:
4347 return TypeTag.DOUBLE;
4348 case BOOLEAN:
4349 return TypeTag.BOOLEAN;
4350 default:
4351 return TypeTag.NONE;
4352 }
4353 }
4354
4355 void checkSourceLevel(Feature feature) {
4356 checkSourceLevel(token.pos, feature);
4357 }
4358
4359 protected void checkSourceLevel(int pos, Feature feature) {
4360 if (preview.isPreview(feature) && !preview.isEnabled()) {
4361 //preview feature without --preview flag, error
4362 log.error(DiagnosticFlag.SOURCE_LEVEL, pos, preview.disabledError(feature));
4363 } else if (!feature.allowedInSource(source)) {
4364 //incompatible source level, error
4365 log.error(DiagnosticFlag.SOURCE_LEVEL, pos, feature.error(source.name));
4366 } else if (preview.isPreview(feature)) {
4367 //use of preview feature, warn
4368 preview.warnPreview(pos, feature);
4369 }
4370 }
4371
4372 /*
4373 * a functional source tree and end position mappings
4374 */
4375 protected static class SimpleEndPosTable extends AbstractEndPosTable {
4376
4377 private final IntHashTable endPosMap;
4378
4379 SimpleEndPosTable(JavacParser parser) {
4380 super(parser);
4381 endPosMap = new IntHashTable();
4382 }
4383
4384 public void storeEnd(JCTree tree, int endpos) {
4385 endPosMap.putAtIndex(tree, errorEndPos > endpos ? errorEndPos : endpos,
4386 endPosMap.lookup(tree));
4387 }
4388
4389 protected <T extends JCTree> T to(T t) {
4390 storeEnd(t, parser.token.endPos);
4391 return t;
4392 }
4393
4394 protected <T extends JCTree> T toP(T t) {
4395 storeEnd(t, parser.S.prevToken().endPos);
4396 return t;
4397 }
4398
4399 public int getEndPos(JCTree tree) {
4400 int value = endPosMap.getFromIndex(endPosMap.lookup(tree));
4401 // As long as Position.NOPOS==-1, this just returns value.
4402 return (value == -1) ? Position.NOPOS : value;
4403 }
4404
4405 public int replaceTree(JCTree oldTree, JCTree newTree) {
4406 int pos = endPosMap.remove(oldTree);
4407 if (pos != -1) {
4408 storeEnd(newTree, pos);
4409 return pos;
4410 }
4411 return Position.NOPOS;
4412 }
4413 }
4414
4415 /*
4416 * a default skeletal implementation without any mapping overhead.
4417 */
4418 protected static class EmptyEndPosTable extends AbstractEndPosTable {
4419
4420 EmptyEndPosTable(JavacParser parser) {
4421 super(parser);
4422 }
4423
4424 public void storeEnd(JCTree tree, int endpos) { /* empty */ }
4425
4426 protected <T extends JCTree> T to(T t) {
4427 return t;
4428 }
4429
4430 protected <T extends JCTree> T toP(T t) {
4431 return t;
4432 }
4433
4434 public int getEndPos(JCTree tree) {
4435 return Position.NOPOS;
4436 }
4437
4438 public int replaceTree(JCTree oldTree, JCTree newTree) {
4439 return Position.NOPOS;
4440 }
4441
4442 }
4443
4444 protected static abstract class AbstractEndPosTable implements EndPosTable {
4445 /**
4446 * The current parser.
4447 */
4448 protected JavacParser parser;
4449
4450 /**
4451 * Store the last error position.
4452 */
4453 public int errorEndPos = Position.NOPOS;
4454
4455 public AbstractEndPosTable(JavacParser parser) {
4456 this.parser = parser;
4457 }
4458
4459 /**
4460 * Store current token's ending position for a tree, the value of which
4461 * will be the greater of last error position and the ending position of
4462 * the current token.
4463 * @param t The tree.
4464 */
4465 protected abstract <T extends JCTree> T to(T t);
4466
4467 /**
4468 * Store current token's ending position for a tree, the value of which
4469 * will be the greater of last error position and the ending position of
4470 * the previous token.
4471 * @param t The tree.
4472 */
4473 protected abstract <T extends JCTree> T toP(T t);
4474
4475 /**
4476 * Set the error position during the parsing phases, the value of which
4477 * will be set only if it is greater than the last stored error position.
4478 * @param errPos The error position
4479 */
4480 public void setErrorEndPos(int errPos) {
4481 if (errPos > errorEndPos) {
4482 errorEndPos = errPos;
4483 }
4484 }
4485
4486 public void setParser(JavacParser parser) {
4487 this.parser = parser;
4488 }
4489 }
4490 }