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 accept(RBRACE);
1396 return e;
1397 default:
1398 nextToken(); // to ensure progress
1399 syntaxError(pos, Errors.Expected3(CASE, DEFAULT, RBRACE));
1400 }
1401 }
1402 default:
1403 return illegal();
1404 }
1405 return term3Rest(t, typeArgs);
1406 }
1407
1408 private List<JCCase> switchExpressionStatementGroup() {
1409 ListBuffer<JCCase> caseExprs = new ListBuffer<>();
1410 int casePos = token.pos;
1411 ListBuffer<JCExpression> pats = new ListBuffer<>();
1412
1413 if (token.kind == DEFAULT) {
1414 nextToken();
1415 } else {
1416 accept(CASE);
1417 while (true) {
1418 pats.append(term(EXPR | NOLAMBDA));
1419 if (token.kind != COMMA) break;
1420 checkSourceLevel(Feature.SWITCH_MULTIPLE_CASE_LABELS);
1421 nextToken();
1422 };
1423 }
1424 List<JCStatement> stats = null;
1425 JCTree body = null;
1426 @SuppressWarnings("removal")
1427 CaseKind kind;
1428 switch (token.kind) {
1429 case ARROW:
1430 checkSourceLevel(Feature.SWITCH_RULE);
1431 nextToken();
1432 if (token.kind == TokenKind.THROW || token.kind == TokenKind.LBRACE) {
1433 stats = List.of(parseStatement());
1434 body = stats.head;
1435 kind = JCCase.RULE;
1436 } else {
1437 JCExpression value = parseExpression();
1438 stats = List.of(to(F.at(value).Break(value)));
1439 body = value;
1440 kind = JCCase.RULE;
1441 accept(SEMI);
1442 }
1443 break;
1444 default:
1445 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
1446 stats = blockStatements();
1447 kind = JCCase.STATEMENT;
1448 break;
1449 }
1450 caseExprs.append(toP(F.at(casePos).Case(kind, pats.toList(), stats, body)));
1451 return caseExprs.toList();
1452 }
1453
1454 JCExpression term3Rest(JCExpression t, List<JCExpression> typeArgs) {
1455 if (typeArgs != null) illegal();
1456 while (true) {
1457 int pos1 = token.pos;
1458 final List<JCAnnotation> annos = typeAnnotationsOpt();
1459
1460 if (token.kind == LBRACKET) {
1461 nextToken();
1462 if ((mode & TYPE) != 0) {
1463 int oldmode = mode;
1464 selectTypeMode();
1465 if (token.kind == RBRACKET) {
1466 nextToken();
1467 t = bracketsOpt(t);
1468 t = toP(F.at(pos1).TypeArray(t));
1469 if (token.kind == COLCOL) {
1470 selectExprMode();
1471 continue;
1472 }
1473 if (annos.nonEmpty()) {
1474 t = toP(F.at(pos1).AnnotatedType(annos, t));
1475 }
1476 return t;
1477 }
1478 mode = oldmode;
1479 }
1480 if ((mode & EXPR) != 0) {
1481 selectExprMode();
1482 JCExpression t1 = term();
1483 t = to(F.at(pos1).Indexed(t, t1));
1484 }
1485 accept(RBRACKET);
1486 } else if (token.kind == DOT) {
1487 nextToken();
1488 typeArgs = typeArgumentsOpt(EXPR);
1489 if (token.kind == SUPER && (mode & EXPR) != 0) {
1490 selectExprMode();
1491 t = to(F.at(pos1).Select(t, names._super));
1492 nextToken();
1493 t = arguments(typeArgs, t);
1494 typeArgs = null;
1495 } else if (token.kind == NEW && (mode & EXPR) != 0) {
1496 if (typeArgs != null) return illegal();
1497 selectExprMode();
1498 int pos2 = token.pos;
1499 nextToken();
1500 if (token.kind == LT) typeArgs = typeArguments(false);
1501 t = innerCreator(pos2, typeArgs, t);
1502 typeArgs = null;
1503 } else {
1504 List<JCAnnotation> tyannos = null;
1505 if ((mode & TYPE) != 0 && token.kind == MONKEYS_AT) {
1506 // is the mode check needed?
1507 tyannos = typeAnnotationsOpt();
1508 }
1509 t = toP(F.at(pos1).Select(t, ident(true)));
1510 if (tyannos != null && tyannos.nonEmpty()) {
1511 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
1512 }
1513 t = argumentsOpt(typeArgs, typeArgumentsOpt(t));
1514 typeArgs = null;
1515 }
1516 } else if ((mode & EXPR) != 0 && token.kind == COLCOL) {
1517 selectExprMode();
1518 if (typeArgs != null) return illegal();
1519 accept(COLCOL);
1520 t = memberReferenceSuffix(pos1, t);
1521 } else {
1522 if (!annos.isEmpty()) {
1523 if (permitTypeAnnotationsPushBack)
1524 typeAnnotationsPushedBack = annos;
1525 else
1526 return illegal(annos.head.pos);
1527 }
1528 break;
1529 }
1530 }
1531 while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && (mode & EXPR) != 0) {
1532 selectExprMode();
1533 t = to(F.at(token.pos).Unary(
1534 token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
1535 nextToken();
1536 }
1537 return toP(t);
1538 }
1539
1540 /**
1541 * If we see an identifier followed by a '<' it could be an unbound
1542 * method reference or a binary expression. To disambiguate, look for a
1543 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1544 */
1545 @SuppressWarnings("fallthrough")
1546 boolean isUnboundMemberRef() {
1547 int pos = 0, depth = 0;
1548 outer: for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
1549 switch (t.kind) {
1550 case IDENTIFIER: case UNDERSCORE: case QUES: case EXTENDS: case SUPER:
1551 case DOT: case RBRACKET: case LBRACKET: case COMMA:
1552 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1553 case DOUBLE: case BOOLEAN: case CHAR:
1554 case MONKEYS_AT:
1555 break;
1556
1557 case LPAREN:
1558 // skip annotation values
1559 int nesting = 0;
1560 for (; ; pos++) {
1561 TokenKind tk2 = S.token(pos).kind;
1562 switch (tk2) {
1563 case EOF:
1564 return false;
1565 case LPAREN:
1566 nesting++;
1567 break;
1568 case RPAREN:
1569 nesting--;
1570 if (nesting == 0) {
1571 continue outer;
1572 }
1573 break;
1574 }
1575 }
1576
1577 case LT:
1578 depth++; break;
1579 case GTGTGT:
1580 depth--;
1581 case GTGT:
1582 depth--;
1583 case GT:
1584 depth--;
1585 if (depth == 0) {
1586 TokenKind nextKind = S.token(pos + 1).kind;
1587 return
1588 nextKind == TokenKind.DOT ||
1589 nextKind == TokenKind.LBRACKET ||
1590 nextKind == TokenKind.COLCOL;
1591 }
1592 break;
1593 default:
1594 return false;
1595 }
1596 }
1597 }
1598
1599 /**
1600 * If we see an identifier followed by a '<' it could be an unbound
1601 * method reference or a binary expression. To disambiguate, look for a
1602 * matching '>' and see if the subsequent terminal is either '.' or '::'.
1603 */
1604 @SuppressWarnings("fallthrough")
1605 ParensResult analyzeParens() {
1606 int depth = 0;
1607 boolean type = false;
1608 ParensResult defaultResult = ParensResult.PARENS;
1609 outer: for (int lookahead = 0 ; ; lookahead++) {
1610 TokenKind tk = S.token(lookahead).kind;
1611 switch (tk) {
1612 case COMMA:
1613 type = true;
1614 case EXTENDS: case SUPER: case DOT: case AMP:
1615 //skip
1616 break;
1617 case QUES:
1618 if (peekToken(lookahead, EXTENDS) ||
1619 peekToken(lookahead, SUPER)) {
1620 //wildcards
1621 type = true;
1622 }
1623 break;
1624 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
1625 case DOUBLE: case BOOLEAN: case CHAR: case VOID:
1626 if (peekToken(lookahead, RPAREN)) {
1627 //Type, ')' -> cast
1628 return ParensResult.CAST;
1629 } else if (peekToken(lookahead, LAX_IDENTIFIER)) {
1630 //Type, Identifier/'_'/'assert'/'enum' -> explicit lambda
1631 return ParensResult.EXPLICIT_LAMBDA;
1632 }
1633 break;
1634 case LPAREN:
1635 if (lookahead != 0) {
1636 // '(' in a non-starting position -> parens
1637 return ParensResult.PARENS;
1638 } else if (peekToken(lookahead, RPAREN)) {
1639 // '(', ')' -> explicit lambda
1640 return ParensResult.EXPLICIT_LAMBDA;
1641 }
1642 break;
1643 case RPAREN:
1644 // if we have seen something that looks like a type,
1645 // then it's a cast expression
1646 if (type) return ParensResult.CAST;
1647 // otherwise, disambiguate cast vs. parenthesized expression
1648 // based on subsequent token.
1649 switch (S.token(lookahead + 1).kind) {
1650 /*case PLUSPLUS: case SUBSUB: */
1651 case BANG: case TILDE:
1652 case LPAREN: case THIS: case SUPER:
1653 case INTLITERAL: case LONGLITERAL: case FLOATLITERAL:
1654 case DOUBLELITERAL: case CHARLITERAL: case STRINGLITERAL:
1655 case TRUE: case FALSE: case NULL:
1656 case NEW: case IDENTIFIER: case ASSERT: case ENUM: case UNDERSCORE:
1657 case BYTE: case SHORT: case CHAR: case INT:
1658 case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
1659 return ParensResult.CAST;
1660 default:
1661 return defaultResult;
1662 }
1663 case UNDERSCORE:
1664 case ASSERT:
1665 case ENUM:
1666 case IDENTIFIER:
1667 if (peekToken(lookahead, LAX_IDENTIFIER)) {
1668 // Identifier, Identifier/'_'/'assert'/'enum' -> explicit lambda
1669 return ParensResult.EXPLICIT_LAMBDA;
1670 } else if (peekToken(lookahead, RPAREN, ARROW)) {
1671 // Identifier, ')' '->' -> implicit lambda
1672 return (mode & NOLAMBDA) == 0 ? ParensResult.IMPLICIT_LAMBDA
1673 : ParensResult.PARENS;
1674 } else if (depth == 0 && peekToken(lookahead, COMMA)) {
1675 defaultResult = ParensResult.IMPLICIT_LAMBDA;
1676 }
1677 type = false;
1678 break;
1679 case FINAL:
1680 case ELLIPSIS:
1681 //those can only appear in explicit lambdas
1682 return ParensResult.EXPLICIT_LAMBDA;
1683 case MONKEYS_AT:
1684 type = true;
1685 lookahead += 1; //skip '@'
1686 while (peekToken(lookahead, DOT)) {
1687 lookahead += 2;
1688 }
1689 if (peekToken(lookahead, LPAREN)) {
1690 lookahead++;
1691 //skip annotation values
1692 int nesting = 0;
1693 for (; ; lookahead++) {
1694 TokenKind tk2 = S.token(lookahead).kind;
1695 switch (tk2) {
1696 case EOF:
1697 return ParensResult.PARENS;
1698 case LPAREN:
1699 nesting++;
1700 break;
1701 case RPAREN:
1702 nesting--;
1703 if (nesting == 0) {
1704 continue outer;
1705 }
1706 break;
1707 }
1708 }
1709 }
1710 break;
1711 case LBRACKET:
1712 if (peekToken(lookahead, RBRACKET, LAX_IDENTIFIER)) {
1713 // '[', ']', Identifier/'_'/'assert'/'enum' -> explicit lambda
1714 return ParensResult.EXPLICIT_LAMBDA;
1715 } else if (peekToken(lookahead, RBRACKET, RPAREN) ||
1716 peekToken(lookahead, RBRACKET, AMP)) {
1717 // '[', ']', ')' -> cast
1718 // '[', ']', '&' -> cast (intersection type)
1719 return ParensResult.CAST;
1720 } else if (peekToken(lookahead, RBRACKET)) {
1721 //consume the ']' and skip
1722 type = true;
1723 lookahead++;
1724 break;
1725 } else {
1726 return ParensResult.PARENS;
1727 }
1728 case LT:
1729 depth++; break;
1730 case GTGTGT:
1731 depth--;
1732 case GTGT:
1733 depth--;
1734 case GT:
1735 depth--;
1736 if (depth == 0) {
1737 if (peekToken(lookahead, RPAREN) ||
1738 peekToken(lookahead, AMP)) {
1739 // '>', ')' -> cast
1740 // '>', '&' -> cast
1741 return ParensResult.CAST;
1742 } else if (peekToken(lookahead, LAX_IDENTIFIER, COMMA) ||
1743 peekToken(lookahead, LAX_IDENTIFIER, RPAREN, ARROW) ||
1744 peekToken(lookahead, ELLIPSIS)) {
1745 // '>', Identifier/'_'/'assert'/'enum', ',' -> explicit lambda
1746 // '>', Identifier/'_'/'assert'/'enum', ')', '->' -> explicit lambda
1747 // '>', '...' -> explicit lambda
1748 return ParensResult.EXPLICIT_LAMBDA;
1749 }
1750 //it looks a type, but could still be (i) a cast to generic type,
1751 //(ii) an unbound method reference or (iii) an explicit lambda
1752 type = true;
1753 break;
1754 } else if (depth < 0) {
1755 //unbalanced '<', '>' - not a generic type
1756 return ParensResult.PARENS;
1757 }
1758 break;
1759 default:
1760 //this includes EOF
1761 return defaultResult;
1762 }
1763 }
1764 }
1765
1766 /** Accepts all identifier-like tokens */
1767 protected Filter<TokenKind> LAX_IDENTIFIER = t -> t == IDENTIFIER || t == UNDERSCORE || t == ASSERT || t == ENUM;
1768
1769 enum ParensResult {
1770 CAST,
1771 EXPLICIT_LAMBDA,
1772 IMPLICIT_LAMBDA,
1773 PARENS
1774 }
1775
1776 JCExpression lambdaExpressionOrStatement(boolean hasParens, boolean explicitParams, int pos) {
1777 List<JCVariableDecl> params = explicitParams ?
1778 formalParameters(true) :
1779 implicitParameters(hasParens);
1780 if (explicitParams) {
1781 LambdaClassifier lambdaClassifier = new LambdaClassifier();
1782 for (JCVariableDecl param: params) {
1783 if (param.vartype != null &&
1784 isRestrictedLocalVarTypeName(param.vartype, false) &&
1785 param.vartype.hasTag(TYPEARRAY)) {
1786 log.error(DiagnosticFlag.SYNTAX, param.pos,
1787 Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS.allowedInSource(source)
1788 ? Errors.VarNotAllowedArray : Errors.VarNotAllowedHere);
1789 }
1790 lambdaClassifier.addParameter(param);
1791 if (lambdaClassifier.result() == LambdaParameterKind.ERROR) {
1792 break;
1793 }
1794 }
1795 if (lambdaClassifier.diagFragment != null) {
1796 log.error(DiagnosticFlag.SYNTAX, pos, Errors.InvalidLambdaParameterDeclaration(lambdaClassifier.diagFragment));
1797 }
1798 for (JCVariableDecl param: params) {
1799 if (param.vartype != null
1800 && isRestrictedLocalVarTypeName(param.vartype, true)) {
1801 checkSourceLevel(param.pos, Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS);
1802 param.startPos = TreeInfo.getStartPos(param.vartype);
1803 param.vartype = null;
1804 }
1805 }
1806 }
1807 return lambdaExpressionOrStatementRest(params, pos);
1808 }
1809
1810 enum LambdaParameterKind {
1811 VAR(0),
1812 EXPLICIT(1),
1813 IMPLICIT(2),
1814 ERROR(-1);
1815
1816 private final int index;
1817
1818 LambdaParameterKind(int index) {
1819 this.index = index;
1820 }
1821 }
1822
1823 private final static Fragment[][] decisionTable = new Fragment[][] {
1824 /* VAR EXPLICIT IMPLICIT */
1825 /* VAR */ {null, VarAndExplicitNotAllowed, VarAndImplicitNotAllowed},
1826 /* EXPLICIT */ {VarAndExplicitNotAllowed, null, ImplicitAndExplicitNotAllowed},
1827 /* IMPLICIT */ {VarAndImplicitNotAllowed, ImplicitAndExplicitNotAllowed, null},
1828 };
1829
1830 class LambdaClassifier {
1831
1832 LambdaParameterKind kind;
1833 Fragment diagFragment;
1834 List<JCVariableDecl> params;
1835
1836 void addParameter(JCVariableDecl param) {
1837 if (param.vartype != null && param.name != names.empty) {
1838 if (isRestrictedLocalVarTypeName(param.vartype, false)) {
1839 reduce(LambdaParameterKind.VAR);
1840 } else {
1841 reduce(LambdaParameterKind.EXPLICIT);
1842 }
1843 }
1844 if (param.vartype == null && param.name != names.empty ||
1845 param.vartype != null && param.name == names.empty) {
1846 reduce(LambdaParameterKind.IMPLICIT);
1847 }
1848 }
1849
1850 private void reduce(LambdaParameterKind newKind) {
1851 if (kind == null) {
1852 kind = newKind;
1853 } else if (kind != newKind && kind != LambdaParameterKind.ERROR) {
1854 LambdaParameterKind currentKind = kind;
1855 kind = LambdaParameterKind.ERROR;
1856 boolean varIndex = currentKind.index == LambdaParameterKind.VAR.index ||
1857 newKind.index == LambdaParameterKind.VAR.index;
1858 diagFragment = Feature.VAR_SYNTAX_IMPLICIT_LAMBDAS.allowedInSource(source) || !varIndex ?
1859 decisionTable[currentKind.index][newKind.index] : null;
1860 }
1861 }
1862
1863 LambdaParameterKind result() {
1864 return kind;
1865 }
1866 }
1867
1868 JCExpression lambdaExpressionOrStatementRest(List<JCVariableDecl> args, int pos) {
1869 checkSourceLevel(Feature.LAMBDA);
1870 accept(ARROW);
1871
1872 return token.kind == LBRACE ?
1873 lambdaStatement(args, pos, token.pos) :
1874 lambdaExpression(args, pos);
1875 }
1876
1877 JCExpression lambdaStatement(List<JCVariableDecl> args, int pos, int pos2) {
1878 JCBlock block = block(pos2, 0);
1879 return toP(F.at(pos).Lambda(args, block));
1880 }
1881
1882 JCExpression lambdaExpression(List<JCVariableDecl> args, int pos) {
1883 JCTree expr = parseExpression();
1884 return toP(F.at(pos).Lambda(args, expr));
1885 }
1886
1887 /** SuperSuffix = Arguments | "." [TypeArguments] Ident [Arguments]
1888 */
1889 JCExpression superSuffix(List<JCExpression> typeArgs, JCExpression t) {
1890 nextToken();
1891 if (token.kind == LPAREN || typeArgs != null) {
1892 t = arguments(typeArgs, t);
1893 } else if (token.kind == COLCOL) {
1894 if (typeArgs != null) return illegal();
1895 t = memberReferenceSuffix(t);
1896 } else {
1897 int pos = token.pos;
1898 accept(DOT);
1899 typeArgs = (token.kind == LT) ? typeArguments(false) : null;
1900 t = toP(F.at(pos).Select(t, ident()));
1901 t = argumentsOpt(typeArgs, t);
1902 }
1903 return t;
1904 }
1905
1906 /** BasicType = BYTE | SHORT | CHAR | INT | LONG | FLOAT | DOUBLE | BOOLEAN
1907 */
1908 JCPrimitiveTypeTree basicType() {
1909 JCPrimitiveTypeTree t = to(F.at(token.pos).TypeIdent(typetag(token.kind)));
1910 nextToken();
1911 return t;
1912 }
1913
1914 /** ArgumentsOpt = [ Arguments ]
1915 */
1916 JCExpression argumentsOpt(List<JCExpression> typeArgs, JCExpression t) {
1917 if ((mode & EXPR) != 0 && token.kind == LPAREN || typeArgs != null) {
1918 selectExprMode();
1919 return arguments(typeArgs, t);
1920 } else {
1921 return t;
1922 }
1923 }
1924
1925 /** Arguments = "(" [Expression { COMMA Expression }] ")"
1926 */
1927 List<JCExpression> arguments() {
1928 ListBuffer<JCExpression> args = new ListBuffer<>();
1929 if (token.kind == LPAREN) {
1930 nextToken();
1931 if (token.kind != RPAREN) {
1932 args.append(parseExpression());
1933 while (token.kind == COMMA) {
1934 nextToken();
1935 args.append(parseExpression());
1936 }
1937 }
1938 accept(RPAREN);
1939 } else {
1940 syntaxError(token.pos, Errors.Expected(LPAREN));
1941 }
1942 return args.toList();
1943 }
1944
1945 JCMethodInvocation arguments(List<JCExpression> typeArgs, JCExpression t) {
1946 int pos = token.pos;
1947 List<JCExpression> args = arguments();
1948 return toP(F.at(pos).Apply(typeArgs, t, args));
1949 }
1950
1951 /** TypeArgumentsOpt = [ TypeArguments ]
1952 */
1953 JCExpression typeArgumentsOpt(JCExpression t) {
1954 if (token.kind == LT &&
1955 (mode & TYPE) != 0 &&
1956 (mode & NOPARAMS) == 0) {
1957 selectTypeMode();
1958 return typeArguments(t, false);
1959 } else {
1960 return t;
1961 }
1962 }
1963 List<JCExpression> typeArgumentsOpt() {
1964 return typeArgumentsOpt(TYPE);
1965 }
1966
1967 List<JCExpression> typeArgumentsOpt(int useMode) {
1968 if (token.kind == LT) {
1969 if ((mode & useMode) == 0 ||
1970 (mode & NOPARAMS) != 0) {
1971 illegal();
1972 }
1973 mode = useMode;
1974 return typeArguments(false);
1975 }
1976 return null;
1977 }
1978
1979 /**
1980 * {@literal
1981 * TypeArguments = "<" TypeArgument {"," TypeArgument} ">"
1982 * }
1983 */
1984 List<JCExpression> typeArguments(boolean diamondAllowed) {
1985 if (token.kind == LT) {
1986 nextToken();
1987 if (token.kind == GT && diamondAllowed) {
1988 checkSourceLevel(Feature.DIAMOND);
1989 mode |= DIAMOND;
1990 nextToken();
1991 return List.nil();
1992 } else {
1993 ListBuffer<JCExpression> args = new ListBuffer<>();
1994 args.append(((mode & EXPR) == 0) ? typeArgument() : parseType());
1995 while (token.kind == COMMA) {
1996 nextToken();
1997 args.append(((mode & EXPR) == 0) ? typeArgument() : parseType());
1998 }
1999 switch (token.kind) {
2000
2001 case GTGTGTEQ: case GTGTEQ: case GTEQ:
2002 case GTGTGT: case GTGT:
2003 token = S.split();
2004 break;
2005 case GT:
2006 nextToken();
2007 break;
2008 default:
2009 args.append(syntaxError(token.pos, Errors.Expected(GT)));
2010 break;
2011 }
2012 return args.toList();
2013 }
2014 } else {
2015 return List.of(syntaxError(token.pos, Errors.Expected(LT)));
2016 }
2017 }
2018
2019 /**
2020 * {@literal
2021 * TypeArgument = Type
2022 * | [Annotations] "?"
2023 * | [Annotations] "?" EXTENDS Type {"&" Type}
2024 * | [Annotations] "?" SUPER Type
2025 * }
2026 */
2027 JCExpression typeArgument() {
2028 List<JCAnnotation> annotations = typeAnnotationsOpt();
2029 if (token.kind != QUES) return parseType(false, annotations);
2030 int pos = token.pos;
2031 nextToken();
2032 JCExpression result;
2033 if (token.kind == EXTENDS) {
2034 TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.EXTENDS));
2035 nextToken();
2036 JCExpression bound = parseType();
2037 result = F.at(pos).Wildcard(t, bound);
2038 } else if (token.kind == SUPER) {
2039 TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.SUPER));
2040 nextToken();
2041 JCExpression bound = parseType();
2042 result = F.at(pos).Wildcard(t, bound);
2043 } else if (LAX_IDENTIFIER.accepts(token.kind)) {
2044 //error recovery
2045 TypeBoundKind t = F.at(Position.NOPOS).TypeBoundKind(BoundKind.UNBOUND);
2046 JCExpression wc = toP(F.at(pos).Wildcard(t, null));
2047 JCIdent id = toP(F.at(token.pos).Ident(ident()));
2048 JCErroneous err = F.at(pos).Erroneous(List.<JCTree>of(wc, id));
2049 reportSyntaxError(err, Errors.Expected3(GT, EXTENDS, SUPER));
2050 result = err;
2051 } else {
2052 TypeBoundKind t = toP(F.at(pos).TypeBoundKind(BoundKind.UNBOUND));
2053 result = toP(F.at(pos).Wildcard(t, null));
2054 }
2055 if (!annotations.isEmpty()) {
2056 result = toP(F.at(annotations.head.pos).AnnotatedType(annotations,result));
2057 }
2058 return result;
2059 }
2060
2061 JCTypeApply typeArguments(JCExpression t, boolean diamondAllowed) {
2062 int pos = token.pos;
2063 List<JCExpression> args = typeArguments(diamondAllowed);
2064 return toP(F.at(pos).TypeApply(t, args));
2065 }
2066
2067 /**
2068 * BracketsOpt = { [Annotations] "[" "]" }*
2069 *
2070 * <p>
2071 *
2072 * <code>annotations</code> is the list of annotations targeting
2073 * the expression <code>t</code>.
2074 */
2075 private JCExpression bracketsOpt(JCExpression t,
2076 List<JCAnnotation> annotations) {
2077 List<JCAnnotation> nextLevelAnnotations = typeAnnotationsOpt();
2078
2079 if (token.kind == LBRACKET) {
2080 int pos = token.pos;
2081 nextToken();
2082 t = bracketsOptCont(t, pos, nextLevelAnnotations);
2083 } else if (!nextLevelAnnotations.isEmpty()) {
2084 if (permitTypeAnnotationsPushBack) {
2085 this.typeAnnotationsPushedBack = nextLevelAnnotations;
2086 } else {
2087 return illegal(nextLevelAnnotations.head.pos);
2088 }
2089 }
2090
2091 if (!annotations.isEmpty()) {
2092 t = toP(F.at(token.pos).AnnotatedType(annotations, t));
2093 }
2094 return t;
2095 }
2096
2097 /** BracketsOpt = [ "[" "]" { [Annotations] "[" "]"} ]
2098 */
2099 private JCExpression bracketsOpt(JCExpression t) {
2100 return bracketsOpt(t, List.nil());
2101 }
2102
2103 private JCExpression bracketsOptCont(JCExpression t, int pos,
2104 List<JCAnnotation> annotations) {
2105 accept(RBRACKET);
2106 t = bracketsOpt(t);
2107 t = toP(F.at(pos).TypeArray(t));
2108 if (annotations.nonEmpty()) {
2109 t = toP(F.at(pos).AnnotatedType(annotations, t));
2110 }
2111 return t;
2112 }
2113
2114 /** BracketsSuffixExpr = "." CLASS
2115 * BracketsSuffixType =
2116 */
2117 JCExpression bracketsSuffix(JCExpression t) {
2118 if ((mode & EXPR) != 0 && token.kind == DOT) {
2119 selectExprMode();
2120 int pos = token.pos;
2121 nextToken();
2122 accept(CLASS);
2123 if (token.pos == endPosTable.errorEndPos) {
2124 // error recovery
2125 Name name;
2126 if (LAX_IDENTIFIER.accepts(token.kind)) {
2127 name = token.name();
2128 nextToken();
2129 } else {
2130 name = names.error;
2131 }
2132 t = F.at(pos).Erroneous(List.<JCTree>of(toP(F.at(pos).Select(t, name))));
2133 } else {
2134 Tag tag = t.getTag();
2135 // Type annotations are illegal on class literals. Annotated non array class literals
2136 // are complained about directly in term3(), Here check for type annotations on dimensions
2137 // taking care to handle some interior dimension(s) being annotated.
2138 if ((tag == TYPEARRAY && TreeInfo.containsTypeAnnotation(t)) || tag == ANNOTATED_TYPE)
2139 syntaxError(token.pos, Errors.NoAnnotationsOnDotClass);
2140 t = toP(F.at(pos).Select(t, names._class));
2141 }
2142 } else if ((mode & TYPE) != 0) {
2143 if (token.kind != COLCOL) {
2144 selectTypeMode();
2145 }
2146 } else if (token.kind != COLCOL) {
2147 syntaxError(token.pos, Errors.DotClassExpected);
2148 }
2149 return t;
2150 }
2151
2152 /**
2153 * MemberReferenceSuffix = "::" [TypeArguments] Ident
2154 * | "::" [TypeArguments] "new"
2155 */
2156 JCExpression memberReferenceSuffix(JCExpression t) {
2157 int pos1 = token.pos;
2158 accept(COLCOL);
2159 return memberReferenceSuffix(pos1, t);
2160 }
2161
2162 JCExpression memberReferenceSuffix(int pos1, JCExpression t) {
2163 checkSourceLevel(Feature.METHOD_REFERENCES);
2164 selectExprMode();
2165 List<JCExpression> typeArgs = null;
2166 if (token.kind == LT) {
2167 typeArgs = typeArguments(false);
2168 }
2169 Name refName;
2170 ReferenceMode refMode;
2171 if (token.kind == NEW) {
2172 refMode = ReferenceMode.NEW;
2173 refName = names.init;
2174 nextToken();
2175 } else {
2176 refMode = ReferenceMode.INVOKE;
2177 refName = ident();
2178 }
2179 return toP(F.at(t.getStartPosition()).Reference(refMode, refName, t, typeArgs));
2180 }
2181
2182 /** Creator = [Annotations] Qualident [TypeArguments] ( ArrayCreatorRest | ClassCreatorRest )
2183 */
2184 JCExpression creator(int newpos, List<JCExpression> typeArgs) {
2185 List<JCAnnotation> newAnnotations = typeAnnotationsOpt();
2186
2187 switch (token.kind) {
2188 case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
2189 case DOUBLE: case BOOLEAN:
2190 if (typeArgs == null) {
2191 if (newAnnotations.isEmpty()) {
2192 return arrayCreatorRest(newpos, basicType());
2193 } else {
2194 return arrayCreatorRest(newpos, toP(F.at(newAnnotations.head.pos).AnnotatedType(newAnnotations, basicType())));
2195 }
2196 }
2197 break;
2198 default:
2199 }
2200 JCExpression t = qualident(true);
2201
2202 int oldmode = mode;
2203 selectTypeMode();
2204 boolean diamondFound = false;
2205 int lastTypeargsPos = -1;
2206 if (token.kind == LT) {
2207 lastTypeargsPos = token.pos;
2208 t = typeArguments(t, true);
2209 diamondFound = (mode & DIAMOND) != 0;
2210 }
2211 while (token.kind == DOT) {
2212 if (diamondFound) {
2213 //cannot select after a diamond
2214 illegal();
2215 }
2216 int pos = token.pos;
2217 nextToken();
2218 List<JCAnnotation> tyannos = typeAnnotationsOpt();
2219 t = toP(F.at(pos).Select(t, ident()));
2220
2221 if (tyannos != null && tyannos.nonEmpty()) {
2222 t = toP(F.at(tyannos.head.pos).AnnotatedType(tyannos, t));
2223 }
2224
2225 if (token.kind == LT) {
2226 lastTypeargsPos = token.pos;
2227 t = typeArguments(t, true);
2228 diamondFound = (mode & DIAMOND) != 0;
2229 }
2230 }
2231 mode = oldmode;
2232 if (token.kind == LBRACKET || token.kind == MONKEYS_AT) {
2233 // handle type annotations for non primitive arrays
2234 if (newAnnotations.nonEmpty()) {
2235 t = insertAnnotationsToMostInner(t, newAnnotations, false);
2236 }
2237
2238 JCExpression e = arrayCreatorRest(newpos, t);
2239 if (diamondFound) {
2240 reportSyntaxError(lastTypeargsPos, Errors.CannotCreateArrayWithDiamond);
2241 return toP(F.at(newpos).Erroneous(List.of(e)));
2242 }
2243 else if (typeArgs != null) {
2244 int pos = newpos;
2245 if (!typeArgs.isEmpty() && typeArgs.head.pos != Position.NOPOS) {
2246 // note: this should always happen but we should
2247 // not rely on this as the parser is continuously
2248 // modified to improve error recovery.
2249 pos = typeArgs.head.pos;
2250 }
2251 setErrorEndPos(S.prevToken().endPos);
2252 JCErroneous err = F.at(pos).Erroneous(typeArgs.prepend(e));
2253 reportSyntaxError(err, Errors.CannotCreateArrayWithTypeArguments);
2254 return toP(err);
2255 }
2256 return e;
2257 } else if (token.kind == LPAREN) {
2258 // handle type annotations for instantiations and anonymous classes
2259 if (newAnnotations.nonEmpty()) {
2260 t = insertAnnotationsToMostInner(t, newAnnotations, false);
2261 }
2262 return classCreatorRest(newpos, null, typeArgs, t);
2263 } else {
2264 setErrorEndPos(token.pos);
2265 reportSyntaxError(token.pos, Errors.Expected2(LPAREN, LBRACKET));
2266 t = toP(F.at(newpos).NewClass(null, typeArgs, t, List.nil(), null));
2267 return toP(F.at(newpos).Erroneous(List.<JCTree>of(t)));
2268 }
2269 }
2270
2271 /** InnerCreator = [Annotations] Ident [TypeArguments] ClassCreatorRest
2272 */
2273 JCExpression innerCreator(int newpos, List<JCExpression> typeArgs, JCExpression encl) {
2274 List<JCAnnotation> newAnnotations = typeAnnotationsOpt();
2275
2276 JCExpression t = toP(F.at(token.pos).Ident(ident()));
2277
2278 if (newAnnotations.nonEmpty()) {
2279 t = toP(F.at(newAnnotations.head.pos).AnnotatedType(newAnnotations, t));
2280 }
2281
2282 if (token.kind == LT) {
2283 int oldmode = mode;
2284 t = typeArguments(t, true);
2285 mode = oldmode;
2286 }
2287 return classCreatorRest(newpos, encl, typeArgs, t);
2288 }
2289
2290 /** ArrayCreatorRest = [Annotations] "[" ( "]" BracketsOpt ArrayInitializer
2291 * | Expression "]" {[Annotations] "[" Expression "]"} BracketsOpt )
2292 */
2293 JCExpression arrayCreatorRest(int newpos, JCExpression elemtype) {
2294 List<JCAnnotation> annos = typeAnnotationsOpt();
2295
2296 accept(LBRACKET);
2297 if (token.kind == RBRACKET) {
2298 accept(RBRACKET);
2299 elemtype = bracketsOpt(elemtype, annos);
2300 if (token.kind == LBRACE) {
2301 JCNewArray na = (JCNewArray)arrayInitializer(newpos, elemtype);
2302 if (annos.nonEmpty()) {
2303 // when an array initializer is present then
2304 // the parsed annotations should target the
2305 // new array tree
2306 // bracketsOpt inserts the annotation in
2307 // elemtype, and it needs to be corrected
2308 //
2309 JCAnnotatedType annotated = (JCAnnotatedType)elemtype;
2310 assert annotated.annotations == annos;
2311 na.annotations = annotated.annotations;
2312 na.elemtype = annotated.underlyingType;
2313 }
2314 return na;
2315 } else {
2316 JCExpression t = toP(F.at(newpos).NewArray(elemtype, List.nil(), null));
2317 return syntaxError(token.pos, List.of(t), Errors.ArrayDimensionMissing);
2318 }
2319 } else {
2320 ListBuffer<JCExpression> dims = new ListBuffer<>();
2321
2322 // maintain array dimension type annotations
2323 ListBuffer<List<JCAnnotation>> dimAnnotations = new ListBuffer<>();
2324 dimAnnotations.append(annos);
2325
2326 dims.append(parseExpression());
2327 accept(RBRACKET);
2328 while (token.kind == LBRACKET
2329 || token.kind == MONKEYS_AT) {
2330 List<JCAnnotation> maybeDimAnnos = typeAnnotationsOpt();
2331 int pos = token.pos;
2332 nextToken();
2333 if (token.kind == RBRACKET) {
2334 elemtype = bracketsOptCont(elemtype, pos, maybeDimAnnos);
2335 } else {
2336 if (token.kind == RBRACKET) { // no dimension
2337 elemtype = bracketsOptCont(elemtype, pos, maybeDimAnnos);
2338 } else {
2339 dimAnnotations.append(maybeDimAnnos);
2340 dims.append(parseExpression());
2341 accept(RBRACKET);
2342 }
2343 }
2344 }
2345
2346 List<JCExpression> elems = null;
2347 int errpos = token.pos;
2348
2349 if (token.kind == LBRACE) {
2350 elems = arrayInitializerElements(newpos, elemtype);
2351 }
2352
2353 JCNewArray na = toP(F.at(newpos).NewArray(elemtype, dims.toList(), elems));
2354 na.dimAnnotations = dimAnnotations.toList();
2355
2356 if (elems != null) {
2357 return syntaxError(errpos, List.of(na), Errors.IllegalArrayCreationBothDimensionAndInitialization);
2358 }
2359
2360 return na;
2361 }
2362 }
2363
2364 /** ClassCreatorRest = Arguments [ClassBody]
2365 */
2366 JCNewClass classCreatorRest(int newpos,
2367 JCExpression encl,
2368 List<JCExpression> typeArgs,
2369 JCExpression t)
2370 {
2371 List<JCExpression> args = arguments();
2372 JCClassDecl body = null;
2373 if (token.kind == LBRACE) {
2374 int pos = token.pos;
2375 List<JCTree> defs = classOrInterfaceBody(names.empty, false);
2376 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
2377 body = toP(F.at(pos).AnonymousClassDef(mods, defs));
2378 }
2379 return toP(F.at(newpos).NewClass(encl, typeArgs, t, args, body));
2380 }
2381
2382 /** ArrayInitializer = "{" [VariableInitializer {"," VariableInitializer}] [","] "}"
2383 */
2384 JCExpression arrayInitializer(int newpos, JCExpression t) {
2385 List<JCExpression> elems = arrayInitializerElements(newpos, t);
2386 return toP(F.at(newpos).NewArray(t, List.nil(), elems));
2387 }
2388
2389 List<JCExpression> arrayInitializerElements(int newpos, JCExpression t) {
2390 accept(LBRACE);
2391 ListBuffer<JCExpression> elems = new ListBuffer<>();
2392 if (token.kind == COMMA) {
2393 nextToken();
2394 } else if (token.kind != RBRACE) {
2395 elems.append(variableInitializer());
2396 while (token.kind == COMMA) {
2397 nextToken();
2398 if (token.kind == RBRACE) break;
2399 elems.append(variableInitializer());
2400 }
2401 }
2402 accept(RBRACE);
2403 return elems.toList();
2404 }
2405
2406 /** VariableInitializer = ArrayInitializer | Expression
2407 */
2408 public JCExpression variableInitializer() {
2409 return token.kind == LBRACE ? arrayInitializer(token.pos, null) : parseExpression();
2410 }
2411
2412 /** ParExpression = "(" Expression ")"
2413 */
2414 JCExpression parExpression() {
2415 int pos = token.pos;
2416 accept(LPAREN);
2417 JCExpression t = parseExpression();
2418 accept(RPAREN);
2419 return toP(F.at(pos).Parens(t));
2420 }
2421
2422 /** Block = "{" BlockStatements "}"
2423 */
2424 JCBlock block(int pos, long flags) {
2425 accept(LBRACE);
2426 List<JCStatement> stats = blockStatements();
2427 JCBlock t = F.at(pos).Block(flags, stats);
2428 while (token.kind == CASE || token.kind == DEFAULT) {
2429 syntaxError(token.pos, Errors.Orphaned(token.kind));
2430 switchBlockStatementGroups();
2431 }
2432 // the Block node has a field "endpos" for first char of last token, which is
2433 // usually but not necessarily the last char of the last token.
2434 t.endpos = token.pos;
2435 accept(RBRACE);
2436 return toP(t);
2437 }
2438
2439 public JCBlock block() {
2440 return block(token.pos, 0);
2441 }
2442
2443 /** BlockStatements = { BlockStatement }
2444 * BlockStatement = LocalVariableDeclarationStatement
2445 * | ClassOrInterfaceOrEnumDeclaration
2446 * | [Ident ":"] Statement
2447 * LocalVariableDeclarationStatement
2448 * = { FINAL | '@' Annotation } Type VariableDeclarators ";"
2449 */
2450 @SuppressWarnings("fallthrough")
2451 List<JCStatement> blockStatements() {
2452 //todo: skip to anchor on error(?)
2453 int lastErrPos = -1;
2454 ListBuffer<JCStatement> stats = new ListBuffer<>();
2455 while (true) {
2456 List<JCStatement> stat = blockStatement();
2457 if (stat.isEmpty()) {
2458 return stats.toList();
2459 } else {
2460 // error recovery
2461 if (token.pos == lastErrPos)
2462 return stats.toList();
2463 if (token.pos <= endPosTable.errorEndPos) {
2464 skip(false, true, true, true);
2465 lastErrPos = token.pos;
2466 }
2467 stats.addAll(stat);
2468 }
2469 }
2470 }
2471
2472 /*
2473 * Parse a Statement (JLS 14.5). As an enhancement to improve error recovery,
2474 * this method will also recognize variable and class declarations (which are
2475 * not legal for a Statement) by delegating the parsing to BlockStatement (JLS 14.2).
2476 * If any illegal declarations are found, they will be wrapped in an erroneous tree,
2477 * and an error will be produced by this method.
2478 */
2479 JCStatement parseStatementAsBlock() {
2480 int pos = token.pos;
2481 List<JCStatement> stats = blockStatement();
2482 if (stats.isEmpty()) {
2483 JCErroneous e = syntaxError(pos, Errors.IllegalStartOfStmt);
2484 return toP(F.at(pos).Exec(e));
2485 } else {
2486 JCStatement first = stats.head;
2487 Error error = null;
2488 switch (first.getTag()) {
2489 case CLASSDEF:
2490 error = Errors.ClassNotAllowed;
2491 break;
2492 case VARDEF:
2493 error = Errors.VariableNotAllowed;
2494 break;
2495 }
2496 if (error != null) {
2497 log.error(DiagnosticFlag.SYNTAX, first, error);
2498 List<JCBlock> blist = List.of(F.at(first.pos).Block(0, stats));
2499 return toP(F.at(pos).Exec(F.at(first.pos).Erroneous(blist)));
2500 }
2501 return first;
2502 }
2503 }
2504
2505 /**This method parses a statement appearing inside a block.
2506 */
2507 List<JCStatement> blockStatement() {
2508 //todo: skip to anchor on error(?)
2509 int pos = token.pos;
2510 switch (token.kind) {
2511 case RBRACE: case CASE: case DEFAULT: case EOF:
2512 return List.nil();
2513 case LBRACE: case IF: case FOR: case WHILE: case DO: case TRY:
2514 case SWITCH: case SYNCHRONIZED: case RETURN: case THROW: case BREAK:
2515 case CONTINUE: case SEMI: case ELSE: case FINALLY: case CATCH:
2516 case ASSERT:
2517 return List.of(parseSimpleStatement());
2518 case MONKEYS_AT:
2519 case FINAL: {
2520 Comment dc = token.comment(CommentStyle.JAVADOC);
2521 JCModifiers mods = modifiersOpt();
2522 if (token.kind == INTERFACE ||
2523 token.kind == CLASS ||
2524 token.kind == ENUM) {
2525 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
2526 } else {
2527 JCExpression t = parseType(true);
2528 return localVariableDeclarations(mods, t);
2529 }
2530 }
2531 case ABSTRACT: case STRICTFP: {
2532 Comment dc = token.comment(CommentStyle.JAVADOC);
2533 JCModifiers mods = modifiersOpt();
2534 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
2535 }
2536 case INTERFACE:
2537 case CLASS:
2538 Comment dc = token.comment(CommentStyle.JAVADOC);
2539 return List.of(classOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
2540 case ENUM:
2541 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.LocalEnum);
2542 dc = token.comment(CommentStyle.JAVADOC);
2543 return List.of(classOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
2544 default:
2545 Token prevToken = token;
2546 JCExpression t = term(EXPR | TYPE);
2547 if (token.kind == COLON && t.hasTag(IDENT)) {
2548 nextToken();
2549 JCStatement stat = parseStatementAsBlock();
2550 return List.of(F.at(pos).Labelled(prevToken.name(), stat));
2551 } else if ((lastmode & TYPE) != 0 && LAX_IDENTIFIER.accepts(token.kind)) {
2552 pos = token.pos;
2553 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
2554 F.at(pos);
2555 return localVariableDeclarations(mods, t);
2556 } else {
2557 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
2558 t = checkExprStat(t);
2559 accept(SEMI);
2560 JCExpressionStatement expr = toP(F.at(pos).Exec(t));
2561 return List.of(expr);
2562 }
2563 }
2564 }
2565 //where
2566 private List<JCStatement> localVariableDeclarations(JCModifiers mods, JCExpression type) {
2567 ListBuffer<JCStatement> stats =
2568 variableDeclarators(mods, type, new ListBuffer<>(), true);
2569 // A "LocalVariableDeclarationStatement" subsumes the terminating semicolon
2570 accept(SEMI);
2571 storeEnd(stats.last(), S.prevToken().endPos);
2572 return stats.toList();
2573 }
2574
2575 /** Statement =
2576 * Block
2577 * | IF ParExpression Statement [ELSE Statement]
2578 * | FOR "(" ForInitOpt ";" [Expression] ";" ForUpdateOpt ")" Statement
2579 * | FOR "(" FormalParameter : Expression ")" Statement
2580 * | WHILE ParExpression Statement
2581 * | DO Statement WHILE ParExpression ";"
2582 * | TRY Block ( Catches | [Catches] FinallyPart )
2583 * | TRY "(" ResourceSpecification ";"opt ")" Block [Catches] [FinallyPart]
2584 * | SWITCH ParExpression "{" SwitchBlockStatementGroups "}"
2585 * | SYNCHRONIZED ParExpression Block
2586 * | RETURN [Expression] ";"
2587 * | THROW Expression ";"
2588 * | BREAK [Ident] ";"
2589 * | CONTINUE [Ident] ";"
2590 * | ASSERT Expression [ ":" Expression ] ";"
2591 * | ";"
2592 */
2593 public JCStatement parseSimpleStatement() {
2594 int pos = token.pos;
2595 switch (token.kind) {
2596 case LBRACE:
2597 return block();
2598 case IF: {
2599 nextToken();
2600 JCExpression cond = parExpression();
2601 JCStatement thenpart = parseStatementAsBlock();
2602 JCStatement elsepart = null;
2603 if (token.kind == ELSE) {
2604 nextToken();
2605 elsepart = parseStatementAsBlock();
2606 }
2607 return F.at(pos).If(cond, thenpart, elsepart);
2608 }
2609 case FOR: {
2610 nextToken();
2611 accept(LPAREN);
2612 List<JCStatement> inits = token.kind == SEMI ? List.nil() : forInit();
2613 if (inits.length() == 1 &&
2614 inits.head.hasTag(VARDEF) &&
2615 ((JCVariableDecl) inits.head).init == null &&
2616 token.kind == COLON) {
2617 JCVariableDecl var = (JCVariableDecl)inits.head;
2618 accept(COLON);
2619 JCExpression expr = parseExpression();
2620 accept(RPAREN);
2621 JCStatement body = parseStatementAsBlock();
2622 return F.at(pos).ForeachLoop(var, expr, body);
2623 } else {
2624 accept(SEMI);
2625 JCExpression cond = token.kind == SEMI ? null : parseExpression();
2626 accept(SEMI);
2627 List<JCExpressionStatement> steps = token.kind == RPAREN ? List.nil() : forUpdate();
2628 accept(RPAREN);
2629 JCStatement body = parseStatementAsBlock();
2630 return F.at(pos).ForLoop(inits, cond, steps, body);
2631 }
2632 }
2633 case WHILE: {
2634 nextToken();
2635 JCExpression cond = parExpression();
2636 JCStatement body = parseStatementAsBlock();
2637 return F.at(pos).WhileLoop(cond, body);
2638 }
2639 case DO: {
2640 nextToken();
2641 JCStatement body = parseStatementAsBlock();
2642 accept(WHILE);
2643 JCExpression cond = parExpression();
2644 accept(SEMI);
2645 JCDoWhileLoop t = toP(F.at(pos).DoLoop(body, cond));
2646 return t;
2647 }
2648 case TRY: {
2649 nextToken();
2650 List<JCTree> resources = List.nil();
2651 if (token.kind == LPAREN) {
2652 nextToken();
2653 resources = resources();
2654 accept(RPAREN);
2655 }
2656 JCBlock body = block();
2657 ListBuffer<JCCatch> catchers = new ListBuffer<>();
2658 JCBlock finalizer = null;
2659 if (token.kind == CATCH || token.kind == FINALLY) {
2660 while (token.kind == CATCH) catchers.append(catchClause());
2661 if (token.kind == FINALLY) {
2662 nextToken();
2663 finalizer = block();
2664 }
2665 } else {
2666 if (resources.isEmpty()) {
2667 log.error(DiagnosticFlag.SYNTAX, pos, Errors.TryWithoutCatchFinallyOrResourceDecls);
2668 }
2669 }
2670 return F.at(pos).Try(resources, body, catchers.toList(), finalizer);
2671 }
2672 case SWITCH: {
2673 nextToken();
2674 JCExpression selector = parExpression();
2675 accept(LBRACE);
2676 List<JCCase> cases = switchBlockStatementGroups();
2677 JCSwitch t = to(F.at(pos).Switch(selector, cases));
2678 accept(RBRACE);
2679 return t;
2680 }
2681 case SYNCHRONIZED: {
2682 nextToken();
2683 JCExpression lock = parExpression();
2684 JCBlock body = block();
2685 return F.at(pos).Synchronized(lock, body);
2686 }
2687 case RETURN: {
2688 nextToken();
2689 JCExpression result = token.kind == SEMI ? null : parseExpression();
2690 accept(SEMI);
2691 JCReturn t = toP(F.at(pos).Return(result));
2692 return t;
2693 }
2694 case THROW: {
2695 nextToken();
2696 JCExpression exc = parseExpression();
2697 accept(SEMI);
2698 JCThrow t = toP(F.at(pos).Throw(exc));
2699 return t;
2700 }
2701 case BREAK: {
2702 nextToken();
2703 JCExpression value = token.kind == SEMI ? null : parseExpression();
2704 accept(SEMI);
2705 JCBreak t = toP(F.at(pos).Break(value));
2706 return t;
2707 }
2708 case CONTINUE: {
2709 nextToken();
2710 Name label = LAX_IDENTIFIER.accepts(token.kind) ? ident() : null;
2711 accept(SEMI);
2712 JCContinue t = toP(F.at(pos).Continue(label));
2713 return t;
2714 }
2715 case SEMI:
2716 nextToken();
2717 return toP(F.at(pos).Skip());
2718 case ELSE:
2719 int elsePos = token.pos;
2720 nextToken();
2721 return doRecover(elsePos, BasicErrorRecoveryAction.BLOCK_STMT, Errors.ElseWithoutIf);
2722 case FINALLY:
2723 int finallyPos = token.pos;
2724 nextToken();
2725 return doRecover(finallyPos, BasicErrorRecoveryAction.BLOCK_STMT, Errors.FinallyWithoutTry);
2726 case CATCH:
2727 return doRecover(token.pos, BasicErrorRecoveryAction.CATCH_CLAUSE, Errors.CatchWithoutTry);
2728 case ASSERT: {
2729 nextToken();
2730 JCExpression assertion = parseExpression();
2731 JCExpression message = null;
2732 if (token.kind == COLON) {
2733 nextToken();
2734 message = parseExpression();
2735 }
2736 accept(SEMI);
2737 JCAssert t = toP(F.at(pos).Assert(assertion, message));
2738 return t;
2739 }
2740 default:
2741 Assert.error();
2742 return null;
2743 }
2744 }
2745
2746 @Override
2747 public JCStatement parseStatement() {
2748 return parseStatementAsBlock();
2749 }
2750
2751 private JCStatement doRecover(int startPos, ErrorRecoveryAction action, Error errorKey) {
2752 int errPos = S.errPos();
2753 JCTree stm = action.doRecover(this);
2754 S.errPos(errPos);
2755 return toP(F.Exec(syntaxError(startPos, List.of(stm), errorKey)));
2756 }
2757
2758 /** CatchClause = CATCH "(" FormalParameter ")" Block
2759 * TODO: the "FormalParameter" is not correct, it uses the special "catchTypes" rule below.
2760 */
2761 protected JCCatch catchClause() {
2762 int pos = token.pos;
2763 accept(CATCH);
2764 accept(LPAREN);
2765 JCModifiers mods = optFinal(Flags.PARAMETER);
2766 List<JCExpression> catchTypes = catchTypes();
2767 JCExpression paramType = catchTypes.size() > 1 ?
2768 toP(F.at(catchTypes.head.getStartPosition()).TypeUnion(catchTypes)) :
2769 catchTypes.head;
2770 JCVariableDecl formal = variableDeclaratorId(mods, paramType);
2771 accept(RPAREN);
2772 JCBlock body = block();
2773 return F.at(pos).Catch(formal, body);
2774 }
2775
2776 List<JCExpression> catchTypes() {
2777 ListBuffer<JCExpression> catchTypes = new ListBuffer<>();
2778 catchTypes.add(parseType());
2779 while (token.kind == BAR) {
2780 nextToken();
2781 // Instead of qualident this is now parseType.
2782 // But would that allow too much, e.g. arrays or generics?
2783 catchTypes.add(parseType());
2784 }
2785 return catchTypes.toList();
2786 }
2787
2788 /** SwitchBlockStatementGroups = { SwitchBlockStatementGroup }
2789 * SwitchBlockStatementGroup = SwitchLabel BlockStatements
2790 * SwitchLabel = CASE ConstantExpression ":" | DEFAULT ":"
2791 */
2792 List<JCCase> switchBlockStatementGroups() {
2793 ListBuffer<JCCase> cases = new ListBuffer<>();
2794 while (true) {
2795 int pos = token.pos;
2796 switch (token.kind) {
2797 case CASE:
2798 case DEFAULT:
2799 cases.appendList(switchBlockStatementGroup());
2800 break;
2801 case RBRACE: case EOF:
2802 return cases.toList();
2803 default:
2804 nextToken(); // to ensure progress
2805 syntaxError(pos, Errors.Expected3(CASE, DEFAULT, RBRACE));
2806 }
2807 }
2808 }
2809
2810 protected List<JCCase> switchBlockStatementGroup() {
2811 int pos = token.pos;
2812 List<JCStatement> stats;
2813 JCCase c;
2814 ListBuffer<JCCase> cases = new ListBuffer<JCCase>();
2815 switch (token.kind) {
2816 case CASE: {
2817 nextToken();
2818 ListBuffer<JCExpression> pats = new ListBuffer<>();
2819 while (true) {
2820 pats.append(term(EXPR | NOLAMBDA));
2821 if (token.kind != COMMA) break;
2822 nextToken();
2823 checkSourceLevel(Feature.SWITCH_MULTIPLE_CASE_LABELS);
2824 };
2825 @SuppressWarnings("removal")
2826 CaseKind caseKind;
2827 JCTree body = null;
2828 if (token.kind == ARROW) {
2829 checkSourceLevel(Feature.SWITCH_RULE);
2830 accept(ARROW);
2831 caseKind = JCCase.RULE;
2832 JCStatement statement = parseStatementAsBlock();
2833 if (!statement.hasTag(EXEC) && !statement.hasTag(BLOCK) && !statement.hasTag(Tag.THROW)) {
2834 log.error(statement.pos(), Errors.SwitchCaseUnexpectedStatement);
2835 }
2836 stats = List.of(statement);
2837 body = stats.head;
2838 } else {
2839 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
2840 caseKind = JCCase.STATEMENT;
2841 stats = blockStatements();
2842 }
2843 c = F.at(pos).Case(caseKind, pats.toList(), stats, body);
2844 if (stats.isEmpty())
2845 storeEnd(c, S.prevToken().endPos);
2846 return cases.append(c).toList();
2847 }
2848 case DEFAULT: {
2849 nextToken();
2850 @SuppressWarnings("removal")
2851 CaseKind caseKind;
2852 JCTree body = null;
2853 if (token.kind == ARROW) {
2854 checkSourceLevel(Feature.SWITCH_RULE);
2855 accept(ARROW);
2856 caseKind = JCCase.RULE;
2857 JCStatement statement = parseStatementAsBlock();
2858 if (!statement.hasTag(EXEC) && !statement.hasTag(BLOCK) && !statement.hasTag(Tag.THROW)) {
2859 log.error(statement.pos(), Errors.SwitchCaseUnexpectedStatement);
2860 }
2861 stats = List.of(statement);
2862 body = stats.head;
2863 } else {
2864 accept(COLON, tk -> Errors.Expected2(COLON, ARROW));
2865 caseKind = JCCase.STATEMENT;
2866 stats = blockStatements();
2867 }
2868 c = F.at(pos).Case(caseKind, List.nil(), stats, body);
2869 if (stats.isEmpty())
2870 storeEnd(c, S.prevToken().endPos);
2871 return cases.append(c).toList();
2872 }
2873 }
2874 throw new AssertionError("should not reach here");
2875 }
2876
2877 /** MoreStatementExpressions = { COMMA StatementExpression }
2878 */
2879 <T extends ListBuffer<? super JCExpressionStatement>> T moreStatementExpressions(int pos,
2880 JCExpression first,
2881 T stats) {
2882 // This Exec is a "StatementExpression"; it subsumes no terminating token
2883 stats.append(toP(F.at(pos).Exec(checkExprStat(first))));
2884 while (token.kind == COMMA) {
2885 nextToken();
2886 pos = token.pos;
2887 JCExpression t = parseExpression();
2888 // This Exec is a "StatementExpression"; it subsumes no terminating token
2889 stats.append(toP(F.at(pos).Exec(checkExprStat(t))));
2890 }
2891 return stats;
2892 }
2893
2894 /** ForInit = StatementExpression MoreStatementExpressions
2895 * | { FINAL | '@' Annotation } Type VariableDeclarators
2896 */
2897 List<JCStatement> forInit() {
2898 ListBuffer<JCStatement> stats = new ListBuffer<>();
2899 int pos = token.pos;
2900 if (token.kind == FINAL || token.kind == MONKEYS_AT) {
2901 return variableDeclarators(optFinal(0), parseType(true), stats, true).toList();
2902 } else {
2903 JCExpression t = term(EXPR | TYPE);
2904 if ((lastmode & TYPE) != 0 && LAX_IDENTIFIER.accepts(token.kind)) {
2905 return variableDeclarators(modifiersOpt(), t, stats, true).toList();
2906 } else if ((lastmode & TYPE) != 0 && token.kind == COLON) {
2907 log.error(DiagnosticFlag.SYNTAX, pos, Errors.BadInitializer("for-loop"));
2908 return List.of((JCStatement)F.at(pos).VarDef(modifiersOpt(), names.error, t, null));
2909 } else {
2910 return moreStatementExpressions(pos, t, stats).toList();
2911 }
2912 }
2913 }
2914
2915 /** ForUpdate = StatementExpression MoreStatementExpressions
2916 */
2917 List<JCExpressionStatement> forUpdate() {
2918 return moreStatementExpressions(token.pos,
2919 parseExpression(),
2920 new ListBuffer<JCExpressionStatement>()).toList();
2921 }
2922
2923 /** AnnotationsOpt = { '@' Annotation }
2924 *
2925 * @param kind Whether to parse an ANNOTATION or TYPE_ANNOTATION
2926 */
2927 protected List<JCAnnotation> annotationsOpt(Tag kind) {
2928 if (token.kind != MONKEYS_AT) return List.nil(); // optimization
2929 ListBuffer<JCAnnotation> buf = new ListBuffer<>();
2930 int prevmode = mode;
2931 while (token.kind == MONKEYS_AT) {
2932 int pos = token.pos;
2933 nextToken();
2934 buf.append(annotation(pos, kind));
2935 }
2936 lastmode = mode;
2937 mode = prevmode;
2938 List<JCAnnotation> annotations = buf.toList();
2939
2940 return annotations;
2941 }
2942
2943 List<JCAnnotation> typeAnnotationsOpt() {
2944 List<JCAnnotation> annotations = annotationsOpt(Tag.TYPE_ANNOTATION);
2945 return annotations;
2946 }
2947
2948 /** ModifiersOpt = { Modifier }
2949 * Modifier = PUBLIC | PROTECTED | PRIVATE | STATIC | ABSTRACT | FINAL
2950 * | NATIVE | SYNCHRONIZED | TRANSIENT | VOLATILE | "@"
2951 * | "@" Annotation
2952 */
2953 protected JCModifiers modifiersOpt() {
2954 return modifiersOpt(null);
2955 }
2956 protected JCModifiers modifiersOpt(JCModifiers partial) {
2957 long flags;
2958 ListBuffer<JCAnnotation> annotations = new ListBuffer<>();
2959 int pos;
2960 if (partial == null) {
2961 flags = 0;
2962 pos = token.pos;
2963 } else {
2964 flags = partial.flags;
2965 annotations.appendList(partial.annotations);
2966 pos = partial.pos;
2967 }
2968 if (token.deprecatedFlag()) {
2969 flags |= Flags.DEPRECATED;
2970 }
2971 int lastPos;
2972 loop:
2973 while (true) {
2974 long flag;
2975 switch (token.kind) {
2976 case PRIVATE : flag = Flags.PRIVATE; break;
2977 case PROTECTED : flag = Flags.PROTECTED; break;
2978 case PUBLIC : flag = Flags.PUBLIC; break;
2979 case STATIC : flag = Flags.STATIC; break;
2980 case TRANSIENT : flag = Flags.TRANSIENT; break;
2981 case FINAL : flag = Flags.FINAL; break;
2982 case ABSTRACT : flag = Flags.ABSTRACT; break;
2983 case NATIVE : flag = Flags.NATIVE; break;
2984 case VOLATILE : flag = Flags.VOLATILE; break;
2985 case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
2986 case STRICTFP : flag = Flags.STRICTFP; break;
2987 case MONKEYS_AT : flag = Flags.ANNOTATION; break;
2988 case DEFAULT : checkSourceLevel(Feature.DEFAULT_METHODS); flag = Flags.DEFAULT; break;
2989 case ERROR : flag = 0; nextToken(); break;
2990 default: break loop;
2991 }
2992 if ((flags & flag) != 0) log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
2993 lastPos = token.pos;
2994 nextToken();
2995 if (flag == Flags.ANNOTATION) {
2996 if (token.kind != INTERFACE) {
2997 JCAnnotation ann = annotation(lastPos, Tag.ANNOTATION);
2998 // if first modifier is an annotation, set pos to annotation's.
2999 if (flags == 0 && annotations.isEmpty())
3000 pos = ann.pos;
3001 annotations.append(ann);
3002 flag = 0;
3003 }
3004 }
3005 flags |= flag;
3006 }
3007 switch (token.kind) {
3008 case ENUM: flags |= Flags.ENUM; break;
3009 case INTERFACE: flags |= Flags.INTERFACE; break;
3010 default: break;
3011 }
3012
3013 /* A modifiers tree with no modifier tokens or annotations
3014 * has no text position. */
3015 if ((flags & (Flags.ModifierFlags | Flags.ANNOTATION)) == 0 && annotations.isEmpty())
3016 pos = Position.NOPOS;
3017
3018 JCModifiers mods = F.at(pos).Modifiers(flags, annotations.toList());
3019 if (pos != Position.NOPOS)
3020 storeEnd(mods, S.prevToken().endPos);
3021 return mods;
3022 }
3023
3024 /** Annotation = "@" Qualident [ "(" AnnotationFieldValues ")" ]
3025 *
3026 * @param pos position of "@" token
3027 * @param kind Whether to parse an ANNOTATION or TYPE_ANNOTATION
3028 */
3029 JCAnnotation annotation(int pos, Tag kind) {
3030 // accept(AT); // AT consumed by caller
3031 if (kind == Tag.TYPE_ANNOTATION) {
3032 checkSourceLevel(Feature.TYPE_ANNOTATIONS);
3033 }
3034 JCTree ident = qualident(false);
3035 List<JCExpression> fieldValues = annotationFieldValuesOpt();
3036 JCAnnotation ann;
3037 if (kind == Tag.ANNOTATION) {
3038 ann = F.at(pos).Annotation(ident, fieldValues);
3039 } else if (kind == Tag.TYPE_ANNOTATION) {
3040 ann = F.at(pos).TypeAnnotation(ident, fieldValues);
3041 } else {
3042 throw new AssertionError("Unhandled annotation kind: " + kind);
3043 }
3044
3045 storeEnd(ann, S.prevToken().endPos);
3046 return ann;
3047 }
3048
3049 List<JCExpression> annotationFieldValuesOpt() {
3050 return (token.kind == LPAREN) ? annotationFieldValues() : List.nil();
3051 }
3052
3053 /** AnnotationFieldValues = "(" [ AnnotationFieldValue { "," AnnotationFieldValue } ] ")" */
3054 List<JCExpression> annotationFieldValues() {
3055 accept(LPAREN);
3056 ListBuffer<JCExpression> buf = new ListBuffer<>();
3057 if (token.kind != RPAREN) {
3058 buf.append(annotationFieldValue());
3059 while (token.kind == COMMA) {
3060 nextToken();
3061 buf.append(annotationFieldValue());
3062 }
3063 }
3064 accept(RPAREN);
3065 return buf.toList();
3066 }
3067
3068 /** AnnotationFieldValue = AnnotationValue
3069 * | Identifier "=" AnnotationValue
3070 */
3071 JCExpression annotationFieldValue() {
3072 if (LAX_IDENTIFIER.accepts(token.kind)) {
3073 selectExprMode();
3074 JCExpression t1 = term1();
3075 if (t1.hasTag(IDENT) && token.kind == EQ) {
3076 int pos = token.pos;
3077 accept(EQ);
3078 JCExpression v = annotationValue();
3079 return toP(F.at(pos).Assign(t1, v));
3080 } else {
3081 return t1;
3082 }
3083 }
3084 return annotationValue();
3085 }
3086
3087 /* AnnotationValue = ConditionalExpression
3088 * | Annotation
3089 * | "{" [ AnnotationValue { "," AnnotationValue } ] [","] "}"
3090 */
3091 JCExpression annotationValue() {
3092 int pos;
3093 switch (token.kind) {
3094 case MONKEYS_AT:
3095 pos = token.pos;
3096 nextToken();
3097 return annotation(pos, Tag.ANNOTATION);
3098 case LBRACE:
3099 pos = token.pos;
3100 accept(LBRACE);
3101 ListBuffer<JCExpression> buf = new ListBuffer<>();
3102 if (token.kind == COMMA) {
3103 nextToken();
3104 } else if (token.kind != RBRACE) {
3105 buf.append(annotationValue());
3106 while (token.kind == COMMA) {
3107 nextToken();
3108 if (token.kind == RBRACE) break;
3109 buf.append(annotationValue());
3110 }
3111 }
3112 accept(RBRACE);
3113 return toP(F.at(pos).NewArray(null, List.nil(), buf.toList()));
3114 default:
3115 selectExprMode();
3116 return term1();
3117 }
3118 }
3119
3120 /** VariableDeclarators = VariableDeclarator { "," VariableDeclarator }
3121 */
3122 public <T extends ListBuffer<? super JCVariableDecl>> T variableDeclarators(JCModifiers mods,
3123 JCExpression type,
3124 T vdefs,
3125 boolean localDecl)
3126 {
3127 return variableDeclaratorsRest(token.pos, mods, type, ident(), false, null, vdefs, localDecl);
3128 }
3129
3130 /** VariableDeclaratorsRest = VariableDeclaratorRest { "," VariableDeclarator }
3131 * ConstantDeclaratorsRest = ConstantDeclaratorRest { "," ConstantDeclarator }
3132 *
3133 * @param reqInit Is an initializer always required?
3134 * @param dc The documentation comment for the variable declarations, or null.
3135 */
3136 protected <T extends ListBuffer<? super JCVariableDecl>> T variableDeclaratorsRest(int pos,
3137 JCModifiers mods,
3138 JCExpression type,
3139 Name name,
3140 boolean reqInit,
3141 Comment dc,
3142 T vdefs,
3143 boolean localDecl)
3144 {
3145 JCVariableDecl head = variableDeclaratorRest(pos, mods, type, name, reqInit, dc, localDecl, false);
3146 vdefs.append(head);
3147 while (token.kind == COMMA) {
3148 // All but last of multiple declarators subsume a comma
3149 storeEnd((JCTree)vdefs.last(), token.endPos);
3150 nextToken();
3151 vdefs.append(variableDeclarator(mods, type, reqInit, dc, localDecl));
3152 }
3153 return vdefs;
3154 }
3155
3156 /** VariableDeclarator = Ident VariableDeclaratorRest
3157 * ConstantDeclarator = Ident ConstantDeclaratorRest
3158 */
3159 JCVariableDecl variableDeclarator(JCModifiers mods, JCExpression type, boolean reqInit, Comment dc, boolean localDecl) {
3160 return variableDeclaratorRest(token.pos, mods, type, ident(), reqInit, dc, localDecl, true);
3161 }
3162
3163 /** VariableDeclaratorRest = BracketsOpt ["=" VariableInitializer]
3164 * ConstantDeclaratorRest = BracketsOpt "=" VariableInitializer
3165 *
3166 * @param reqInit Is an initializer always required?
3167 * @param dc The documentation comment for the variable declarations, or null.
3168 */
3169 JCVariableDecl variableDeclaratorRest(int pos, JCModifiers mods, JCExpression type, Name name,
3170 boolean reqInit, Comment dc, boolean localDecl, boolean compound) {
3171 type = bracketsOpt(type);
3172 JCExpression init = null;
3173 if (token.kind == EQ) {
3174 nextToken();
3175 init = variableInitializer();
3176 }
3177 else if (reqInit) syntaxError(token.pos, Errors.Expected(EQ));
3178 JCTree elemType = TreeInfo.innermostType(type, true);
3179 int startPos = Position.NOPOS;
3180 if (elemType.hasTag(IDENT)) {
3181 Name typeName = ((JCIdent)elemType).name;
3182 if (isRestrictedLocalVarTypeName(typeName, pos, !compound && localDecl)) {
3183 if (type.hasTag(TYPEARRAY) && !compound) {
3184 //error - 'var' and arrays
3185 reportSyntaxError(pos, Errors.VarNotAllowedArray);
3186 } else {
3187 if(compound)
3188 //error - 'var' in compound local var decl
3189 reportSyntaxError(pos, Errors.VarNotAllowedCompound);
3190 startPos = TreeInfo.getStartPos(mods);
3191 if (startPos == Position.NOPOS)
3192 startPos = TreeInfo.getStartPos(type);
3193 //implicit type
3194 type = null;
3195 }
3196 }
3197 }
3198 JCVariableDecl result =
3199 toP(F.at(pos).VarDef(mods, name, type, init));
3200 attach(result, dc);
3201 result.startPos = startPos;
3202 return result;
3203 }
3204
3205 boolean isRestrictedLocalVarTypeName(JCExpression e, boolean shouldWarn) {
3206 switch (e.getTag()) {
3207 case IDENT:
3208 return isRestrictedLocalVarTypeName(((JCIdent)e).name, e.pos, shouldWarn);
3209 case TYPEARRAY:
3210 return isRestrictedLocalVarTypeName(((JCArrayTypeTree)e).elemtype, shouldWarn);
3211 default:
3212 return false;
3213 }
3214 }
3215
3216 boolean isRestrictedLocalVarTypeName(Name name, int pos, boolean shouldWarn) {
3217 if (name == names.var) {
3218 if (Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source)) {
3219 return true;
3220 } else if (shouldWarn) {
3221 log.warning(pos, Warnings.VarNotAllowed);
3222 }
3223 }
3224 return false;
3225 }
3226
3227 /** VariableDeclaratorId = Ident BracketsOpt
3228 */
3229 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type) {
3230 return variableDeclaratorId(mods, type, false);
3231 }
3232 //where
3233 JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type, boolean lambdaParameter) {
3234 int pos = token.pos;
3235 Name name;
3236 if (lambdaParameter && token.kind == UNDERSCORE) {
3237 log.error(pos, Errors.UnderscoreAsIdentifierInLambda);
3238 name = token.name();
3239 nextToken();
3240 } else {
3241 if (allowThisIdent ||
3242 !lambdaParameter ||
3243 LAX_IDENTIFIER.accepts(token.kind) ||
3244 mods.flags != Flags.PARAMETER ||
3245 mods.annotations.nonEmpty()) {
3246 JCExpression pn = qualident(false);
3247 if (pn.hasTag(Tag.IDENT) && ((JCIdent)pn).name != names._this) {
3248 name = ((JCIdent)pn).name;
3249 } else {
3250 if (allowThisIdent) {
3251 if ((mods.flags & Flags.VARARGS) != 0) {
3252 log.error(token.pos, Errors.VarargsAndReceiver);
3253 }
3254 if (token.kind == LBRACKET) {
3255 log.error(token.pos, Errors.ArrayAndReceiver);
3256 }
3257 if (pn.hasTag(Tag.SELECT) && ((JCFieldAccess)pn).name != names._this) {
3258 log.error(token.pos, Errors.WrongReceiver);
3259 }
3260 }
3261 return toP(F.at(pos).ReceiverVarDef(mods, pn, type));
3262 }
3263 } else {
3264 /** if it is a lambda parameter and the token kind is not an identifier,
3265 * and there are no modifiers or annotations, then this means that the compiler
3266 * supposed the lambda to be explicit but it can contain a mix of implicit,
3267 * var or explicit parameters. So we assign the error name to the parameter name
3268 * instead of issuing an error and analyze the lambda parameters as a whole at
3269 * a higher level.
3270 */
3271 name = names.empty;
3272 }
3273 }
3274 if ((mods.flags & Flags.VARARGS) != 0 &&
3275 token.kind == LBRACKET) {
3276 log.error(token.pos, Errors.VarargsAndOldArraySyntax);
3277 }
3278 type = bracketsOpt(type);
3279 return toP(F.at(pos).VarDef(mods, name, type, null));
3280 }
3281
3282 /** Resources = Resource { ";" Resources }
3283 */
3284 List<JCTree> resources() {
3285 ListBuffer<JCTree> defs = new ListBuffer<>();
3286 defs.append(resource());
3287 while (token.kind == SEMI) {
3288 // All but last of multiple declarators must subsume a semicolon
3289 storeEnd(defs.last(), token.endPos);
3290 int semiColonPos = token.pos;
3291 nextToken();
3292 if (token.kind == RPAREN) { // Optional trailing semicolon
3293 // after last resource
3294 break;
3295 }
3296 defs.append(resource());
3297 }
3298 return defs.toList();
3299 }
3300
3301 /** Resource = VariableModifiersOpt Type VariableDeclaratorId "=" Expression
3302 * | Expression
3303 */
3304 protected JCTree resource() {
3305 int startPos = token.pos;
3306 if (token.kind == FINAL || token.kind == MONKEYS_AT) {
3307 JCModifiers mods = optFinal(Flags.FINAL);
3308 JCExpression t = parseType(true);
3309 return variableDeclaratorRest(token.pos, mods, t, ident(), true, null, true, false);
3310 }
3311 JCExpression t = term(EXPR | TYPE);
3312 if ((lastmode & TYPE) != 0 && LAX_IDENTIFIER.accepts(token.kind)) {
3313 JCModifiers mods = toP(F.at(startPos).Modifiers(Flags.FINAL));
3314 return variableDeclaratorRest(token.pos, mods, t, ident(), true, null, true, false);
3315 } else {
3316 checkSourceLevel(Feature.EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES);
3317 if (!t.hasTag(IDENT) && !t.hasTag(SELECT)) {
3318 log.error(t.pos(), Errors.TryWithResourcesExprNeedsVar);
3319 }
3320
3321 return t;
3322 }
3323 }
3324
3325 /** CompilationUnit = [ { "@" Annotation } PACKAGE Qualident ";"] {ImportDeclaration} {TypeDeclaration}
3326 */
3327 public JCTree.JCCompilationUnit parseCompilationUnit() {
3328 Token firstToken = token;
3329 JCModifiers mods = null;
3330 boolean consumedToplevelDoc = false;
3331 boolean seenImport = false;
3332 boolean seenPackage = false;
3333 ListBuffer<JCTree> defs = new ListBuffer<>();
3334 if (token.kind == MONKEYS_AT)
3335 mods = modifiersOpt();
3336
3337 if (token.kind == PACKAGE) {
3338 int packagePos = token.pos;
3339 List<JCAnnotation> annotations = List.nil();
3340 seenPackage = true;
3341 if (mods != null) {
3342 checkNoMods(mods.flags);
3343 annotations = mods.annotations;
3344 mods = null;
3345 }
3346 nextToken();
3347 JCExpression pid = qualident(false);
3348 accept(SEMI);
3349 JCPackageDecl pd = toP(F.at(packagePos).PackageDecl(annotations, pid));
3350 attach(pd, firstToken.comment(CommentStyle.JAVADOC));
3351 consumedToplevelDoc = true;
3352 defs.append(pd);
3353 }
3354
3355 boolean checkForImports = true;
3356 boolean firstTypeDecl = true;
3357 while (token.kind != EOF) {
3358 if (token.pos <= endPosTable.errorEndPos) {
3359 // error recovery
3360 skip(checkForImports, false, false, false);
3361 if (token.kind == EOF)
3362 break;
3363 }
3364 if (checkForImports && mods == null && token.kind == IMPORT) {
3365 seenImport = true;
3366 defs.append(importDeclaration());
3367 } else {
3368 Comment docComment = token.comment(CommentStyle.JAVADOC);
3369 if (firstTypeDecl && !seenImport && !seenPackage) {
3370 docComment = firstToken.comment(CommentStyle.JAVADOC);
3371 consumedToplevelDoc = true;
3372 }
3373 if (mods != null || token.kind != SEMI)
3374 mods = modifiersOpt(mods);
3375 if (firstTypeDecl && token.kind == IDENTIFIER) {
3376 ModuleKind kind = ModuleKind.STRONG;
3377 if (token.name() == names.open) {
3378 kind = ModuleKind.OPEN;
3379 nextToken();
3380 }
3381 if (token.kind == IDENTIFIER && token.name() == names.module) {
3382 if (mods != null) {
3383 checkNoMods(mods.flags & ~Flags.DEPRECATED);
3384 }
3385 defs.append(moduleDecl(mods, kind, docComment));
3386 consumedToplevelDoc = true;
3387 break;
3388 } else if (kind != ModuleKind.STRONG) {
3389 reportSyntaxError(token.pos, Errors.ExpectedModule);
3390 }
3391 }
3392 JCTree def = typeDeclaration(mods, docComment);
3393 if (def instanceof JCExpressionStatement)
3394 def = ((JCExpressionStatement)def).expr;
3395 defs.append(def);
3396 if (def instanceof JCClassDecl)
3397 checkForImports = false;
3398 mods = null;
3399 firstTypeDecl = false;
3400 }
3401 }
3402 JCTree.JCCompilationUnit toplevel = F.at(firstToken.pos).TopLevel(defs.toList());
3403 if (!consumedToplevelDoc)
3404 attach(toplevel, firstToken.comment(CommentStyle.JAVADOC));
3405 if (defs.isEmpty())
3406 storeEnd(toplevel, S.prevToken().endPos);
3407 if (keepDocComments)
3408 toplevel.docComments = docComments;
3409 if (keepLineMap)
3410 toplevel.lineMap = S.getLineMap();
3411 this.endPosTable.setParser(null); // remove reference to parser
3412 toplevel.endPositions = this.endPosTable;
3413 return toplevel;
3414 }
3415
3416 JCModuleDecl moduleDecl(JCModifiers mods, ModuleKind kind, Comment dc) {
3417 int pos = token.pos;
3418 checkSourceLevel(Feature.MODULES);
3419
3420 nextToken();
3421 JCExpression name = qualident(false);
3422 List<JCDirective> directives = null;
3423
3424 accept(LBRACE);
3425 directives = moduleDirectiveList();
3426 accept(RBRACE);
3427 accept(EOF);
3428
3429 JCModuleDecl result = toP(F.at(pos).ModuleDef(mods, kind, name, directives));
3430 attach(result, dc);
3431 return result;
3432 }
3433
3434 List<JCDirective> moduleDirectiveList() {
3435 ListBuffer<JCDirective> defs = new ListBuffer<>();
3436 while (token.kind == IDENTIFIER) {
3437 int pos = token.pos;
3438 if (token.name() == names.requires) {
3439 nextToken();
3440 boolean isTransitive = false;
3441 boolean isStaticPhase = false;
3442 loop:
3443 while (true) {
3444 switch (token.kind) {
3445 case IDENTIFIER:
3446 if (token.name() == names.transitive && !isTransitive) {
3447 Token t1 = S.token(1);
3448 if (t1.kind == SEMI || t1.kind == DOT) {
3449 break loop;
3450 }
3451 isTransitive = true;
3452 break;
3453 } else {
3454 break loop;
3455 }
3456 case STATIC:
3457 if (isStaticPhase) {
3458 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.RepeatedModifier);
3459 }
3460 isStaticPhase = true;
3461 break;
3462 default:
3463 break loop;
3464 }
3465 nextToken();
3466 }
3467 JCExpression moduleName = qualident(false);
3468 accept(SEMI);
3469 defs.append(toP(F.at(pos).Requires(isTransitive, isStaticPhase, moduleName)));
3470 } else if (token.name() == names.exports || token.name() == names.opens) {
3471 boolean exports = token.name() == names.exports;
3472 nextToken();
3473 JCExpression pkgName = qualident(false);
3474 List<JCExpression> moduleNames = null;
3475 if (token.kind == IDENTIFIER && token.name() == names.to) {
3476 nextToken();
3477 moduleNames = qualidentList(false);
3478 }
3479 accept(SEMI);
3480 JCDirective d;
3481 if (exports) {
3482 d = F.at(pos).Exports(pkgName, moduleNames);
3483 } else {
3484 d = F.at(pos).Opens(pkgName, moduleNames);
3485 }
3486 defs.append(toP(d));
3487 } else if (token.name() == names.provides) {
3488 nextToken();
3489 JCExpression serviceName = qualident(false);
3490 if (token.kind == IDENTIFIER && token.name() == names.with) {
3491 nextToken();
3492 List<JCExpression> implNames = qualidentList(false);
3493 accept(SEMI);
3494 defs.append(toP(F.at(pos).Provides(serviceName, implNames)));
3495 } else {
3496 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.ExpectedStr("'" + names.with + "'"));
3497 skip(false, false, false, false);
3498 }
3499 } else if (token.name() == names.uses) {
3500 nextToken();
3501 JCExpression service = qualident(false);
3502 accept(SEMI);
3503 defs.append(toP(F.at(pos).Uses(service)));
3504 } else {
3505 setErrorEndPos(pos);
3506 reportSyntaxError(pos, Errors.InvalidModuleDirective);
3507 break;
3508 }
3509 }
3510 return defs.toList();
3511 }
3512
3513 /** ImportDeclaration = IMPORT [ STATIC ] Ident { "." Ident } [ "." "*" ] ";"
3514 */
3515 protected JCTree importDeclaration() {
3516 int pos = token.pos;
3517 nextToken();
3518 boolean importStatic = false;
3519 if (token.kind == STATIC) {
3520 importStatic = true;
3521 nextToken();
3522 }
3523 JCExpression pid = toP(F.at(token.pos).Ident(ident()));
3524 do {
3525 int pos1 = token.pos;
3526 accept(DOT);
3527 if (token.kind == STAR) {
3528 pid = to(F.at(pos1).Select(pid, names.asterisk));
3529 nextToken();
3530 break;
3531 } else {
3532 pid = toP(F.at(pos1).Select(pid, ident()));
3533 }
3534 } while (token.kind == DOT);
3535 accept(SEMI);
3536 return toP(F.at(pos).Import(pid, importStatic));
3537 }
3538
3539 /** TypeDeclaration = ClassOrInterfaceOrEnumDeclaration
3540 * | ";"
3541 */
3542 JCTree typeDeclaration(JCModifiers mods, Comment docComment) {
3543 int pos = token.pos;
3544 if (mods == null && token.kind == SEMI) {
3545 nextToken();
3546 return toP(F.at(pos).Skip());
3547 } else {
3548 return classOrInterfaceOrEnumDeclaration(modifiersOpt(mods), docComment);
3549 }
3550 }
3551
3552 /** ClassOrInterfaceOrEnumDeclaration = ModifiersOpt
3553 * (ClassDeclaration | InterfaceDeclaration | EnumDeclaration)
3554 * @param mods Any modifiers starting the class or interface declaration
3555 * @param dc The documentation comment for the class, or null.
3556 */
3557 protected JCStatement classOrInterfaceOrEnumDeclaration(JCModifiers mods, Comment dc) {
3558 if (token.kind == CLASS) {
3559 return classDeclaration(mods, dc);
3560 } else if (token.kind == INTERFACE) {
3561 return interfaceDeclaration(mods, dc);
3562 } else if (token.kind == ENUM) {
3563 return enumDeclaration(mods, dc);
3564 } else {
3565 int pos = token.pos;
3566 List<JCTree> errs;
3567 if (LAX_IDENTIFIER.accepts(token.kind)) {
3568 errs = List.of(mods, toP(F.at(pos).Ident(ident())));
3569 setErrorEndPos(token.pos);
3570 } else {
3571 errs = List.of(mods);
3572 }
3573 final JCErroneous erroneousTree;
3574 if (parseModuleInfo) {
3575 erroneousTree = syntaxError(pos, errs, Errors.ExpectedModuleOrOpen);
3576 } else {
3577 erroneousTree = syntaxError(pos, errs, Errors.Expected3(CLASS, INTERFACE, ENUM));
3578 }
3579 return toP(F.Exec(erroneousTree));
3580 }
3581 }
3582
3583 /** ClassDeclaration = CLASS Ident TypeParametersOpt [EXTENDS Type]
3584 * [IMPLEMENTS TypeList] ClassBody
3585 * @param mods The modifiers starting the class declaration
3586 * @param dc The documentation comment for the class, or null.
3587 */
3588 protected JCClassDecl classDeclaration(JCModifiers mods, Comment dc) {
3589 int pos = token.pos;
3590 accept(CLASS);
3591 Name name = typeName();
3592
3593 List<JCTypeParameter> typarams = typeParametersOpt();
3594
3595 JCExpression extending = null;
3596 if (token.kind == EXTENDS) {
3597 nextToken();
3598 extending = parseType();
3599 }
3600 List<JCExpression> implementing = List.nil();
3601 if (token.kind == IMPLEMENTS) {
3602 nextToken();
3603 implementing = typeList();
3604 }
3605 List<JCTree> defs = classOrInterfaceBody(name, false);
3606 JCClassDecl result = toP(F.at(pos).ClassDef(
3607 mods, name, typarams, extending, implementing, defs));
3608 attach(result, dc);
3609 return result;
3610 }
3611
3612 Name typeName() {
3613 int pos = token.pos;
3614 Name name = ident();
3615 if (isRestrictedLocalVarTypeName(name, pos, true)) {
3616 reportSyntaxError(pos, Errors.VarNotAllowed);
3617 }
3618 return name;
3619 }
3620
3621 /** InterfaceDeclaration = INTERFACE Ident TypeParametersOpt
3622 * [EXTENDS TypeList] InterfaceBody
3623 * @param mods The modifiers starting the interface declaration
3624 * @param dc The documentation comment for the interface, or null.
3625 */
3626 protected JCClassDecl interfaceDeclaration(JCModifiers mods, Comment dc) {
3627 int pos = token.pos;
3628 accept(INTERFACE);
3629
3630 Name name = typeName();
3631
3632 List<JCTypeParameter> typarams = typeParametersOpt();
3633
3634 List<JCExpression> extending = List.nil();
3635 if (token.kind == EXTENDS) {
3636 nextToken();
3637 extending = typeList();
3638 }
3639 List<JCTree> defs = classOrInterfaceBody(name, true);
3640 JCClassDecl result = toP(F.at(pos).ClassDef(
3641 mods, name, typarams, null, extending, defs));
3642 attach(result, dc);
3643 return result;
3644 }
3645
3646 /** EnumDeclaration = ENUM Ident [IMPLEMENTS TypeList] EnumBody
3647 * @param mods The modifiers starting the enum declaration
3648 * @param dc The documentation comment for the enum, or null.
3649 */
3650 protected JCClassDecl enumDeclaration(JCModifiers mods, Comment dc) {
3651 int pos = token.pos;
3652 accept(ENUM);
3653
3654 Name name = typeName();
3655
3656 List<JCExpression> implementing = List.nil();
3657 if (token.kind == IMPLEMENTS) {
3658 nextToken();
3659 implementing = typeList();
3660 }
3661
3662 List<JCTree> defs = enumBody(name);
3663 mods.flags |= Flags.ENUM;
3664 JCClassDecl result = toP(F.at(pos).
3665 ClassDef(mods, name, List.nil(),
3666 null, implementing, defs));
3667 attach(result, dc);
3668 return result;
3669 }
3670
3671 /** EnumBody = "{" { EnumeratorDeclarationList } [","]
3672 * [ ";" {ClassBodyDeclaration} ] "}"
3673 */
3674 List<JCTree> enumBody(Name enumName) {
3675 accept(LBRACE);
3676 ListBuffer<JCTree> defs = new ListBuffer<>();
3677 if (token.kind == COMMA) {
3678 nextToken();
3679 } else if (token.kind != RBRACE && token.kind != SEMI) {
3680 defs.append(enumeratorDeclaration(enumName));
3681 while (token.kind == COMMA) {
3682 nextToken();
3683 if (token.kind == RBRACE || token.kind == SEMI) break;
3684 defs.append(enumeratorDeclaration(enumName));
3685 }
3686 if (token.kind != SEMI && token.kind != RBRACE) {
3687 defs.append(syntaxError(token.pos, Errors.Expected3(COMMA, RBRACE, SEMI)));
3688 nextToken();
3689 }
3690 }
3691 if (token.kind == SEMI) {
3692 nextToken();
3693 while (token.kind != RBRACE && token.kind != EOF) {
3694 defs.appendList(classOrInterfaceBodyDeclaration(enumName,
3695 false));
3696 if (token.pos <= endPosTable.errorEndPos) {
3697 // error recovery
3698 skip(false, true, true, false);
3699 }
3700 }
3701 }
3702 accept(RBRACE);
3703 return defs.toList();
3704 }
3705
3706 /** EnumeratorDeclaration = AnnotationsOpt [TypeArguments] IDENTIFIER [ Arguments ] [ "{" ClassBody "}" ]
3707 */
3708 JCTree enumeratorDeclaration(Name enumName) {
3709 Comment dc = token.comment(CommentStyle.JAVADOC);
3710 int flags = Flags.PUBLIC|Flags.STATIC|Flags.FINAL|Flags.ENUM;
3711 if (token.deprecatedFlag()) {
3712 flags |= Flags.DEPRECATED;
3713 }
3714 int pos = token.pos;
3715 List<JCAnnotation> annotations = annotationsOpt(Tag.ANNOTATION);
3716 JCModifiers mods = F.at(annotations.isEmpty() ? Position.NOPOS : pos).Modifiers(flags, annotations);
3717 List<JCExpression> typeArgs = typeArgumentsOpt();
3718 int identPos = token.pos;
3719 Name name = ident();
3720 int createPos = token.pos;
3721 List<JCExpression> args = (token.kind == LPAREN)
3722 ? arguments() : List.nil();
3723 JCClassDecl body = null;
3724 if (token.kind == LBRACE) {
3725 JCModifiers mods1 = F.at(Position.NOPOS).Modifiers(Flags.ENUM);
3726 List<JCTree> defs = classOrInterfaceBody(names.empty, false);
3727 body = toP(F.at(identPos).AnonymousClassDef(mods1, defs));
3728 }
3729 if (args.isEmpty() && body == null)
3730 createPos = identPos;
3731 JCIdent ident = F.at(identPos).Ident(enumName);
3732 JCNewClass create = F.at(createPos).NewClass(null, typeArgs, ident, args, body);
3733 if (createPos != identPos)
3734 storeEnd(create, S.prevToken().endPos);
3735 ident = F.at(identPos).Ident(enumName);
3736 JCTree result = toP(F.at(pos).VarDef(mods, name, ident, create));
3737 attach(result, dc);
3738 return result;
3739 }
3740
3741 /** TypeList = Type {"," Type}
3742 */
3743 List<JCExpression> typeList() {
3744 ListBuffer<JCExpression> ts = new ListBuffer<>();
3745 ts.append(parseType());
3746 while (token.kind == COMMA) {
3747 nextToken();
3748 ts.append(parseType());
3749 }
3750 return ts.toList();
3751 }
3752
3753 /** ClassBody = "{" {ClassBodyDeclaration} "}"
3754 * InterfaceBody = "{" {InterfaceBodyDeclaration} "}"
3755 */
3756 List<JCTree> classOrInterfaceBody(Name className, boolean isInterface) {
3757 accept(LBRACE);
3758 if (token.pos <= endPosTable.errorEndPos) {
3759 // error recovery
3760 skip(false, true, false, false);
3761 if (token.kind == LBRACE)
3762 nextToken();
3763 }
3764 ListBuffer<JCTree> defs = new ListBuffer<>();
3765 while (token.kind != RBRACE && token.kind != EOF) {
3766 defs.appendList(classOrInterfaceBodyDeclaration(className, isInterface));
3767 if (token.pos <= endPosTable.errorEndPos) {
3768 // error recovery
3769 skip(false, true, true, false);
3770 }
3771 }
3772 accept(RBRACE);
3773 return defs.toList();
3774 }
3775
3776 /** ClassBodyDeclaration =
3777 * ";"
3778 * | [STATIC] Block
3779 * | ModifiersOpt
3780 * ( Type Ident
3781 * ( VariableDeclaratorsRest ";" | MethodDeclaratorRest )
3782 * | VOID Ident VoidMethodDeclaratorRest
3783 * | TypeParameters [Annotations]
3784 * ( Type Ident MethodDeclaratorRest
3785 * | VOID Ident VoidMethodDeclaratorRest
3786 * )
3787 * | Ident ConstructorDeclaratorRest
3788 * | TypeParameters Ident ConstructorDeclaratorRest
3789 * | ClassOrInterfaceOrEnumDeclaration
3790 * )
3791 * InterfaceBodyDeclaration =
3792 * ";"
3793 * | ModifiersOpt
3794 * ( Type Ident
3795 * ( ConstantDeclaratorsRest ";" | MethodDeclaratorRest )
3796 * | VOID Ident MethodDeclaratorRest
3797 * | TypeParameters [Annotations]
3798 * ( Type Ident MethodDeclaratorRest
3799 * | VOID Ident VoidMethodDeclaratorRest
3800 * )
3801 * | ClassOrInterfaceOrEnumDeclaration
3802 * )
3803 *
3804 */
3805 protected List<JCTree> classOrInterfaceBodyDeclaration(Name className, boolean isInterface) {
3806 if (token.kind == SEMI) {
3807 nextToken();
3808 return List.nil();
3809 } else {
3810 Comment dc = token.comment(CommentStyle.JAVADOC);
3811 int pos = token.pos;
3812 JCModifiers mods = modifiersOpt();
3813 if (token.kind == CLASS ||
3814 token.kind == INTERFACE ||
3815 token.kind == ENUM) {
3816 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
3817 } else if (token.kind == LBRACE &&
3818 (mods.flags & Flags.StandardFlags & ~Flags.STATIC) == 0 &&
3819 mods.annotations.isEmpty()) {
3820 if (isInterface) {
3821 log.error(DiagnosticFlag.SYNTAX, token.pos, Errors.InitializerNotAllowed);
3822 }
3823 return List.of(block(pos, mods.flags));
3824 } else {
3825 pos = token.pos;
3826 List<JCTypeParameter> typarams = typeParametersOpt();
3827 // if there are type parameters but no modifiers, save the start
3828 // position of the method in the modifiers.
3829 if (typarams.nonEmpty() && mods.pos == Position.NOPOS) {
3830 mods.pos = pos;
3831 storeEnd(mods, pos);
3832 }
3833 List<JCAnnotation> annosAfterParams = annotationsOpt(Tag.ANNOTATION);
3834
3835 if (annosAfterParams.nonEmpty()) {
3836 checkSourceLevel(annosAfterParams.head.pos, Feature.ANNOTATIONS_AFTER_TYPE_PARAMS);
3837 mods.annotations = mods.annotations.appendList(annosAfterParams);
3838 if (mods.pos == Position.NOPOS)
3839 mods.pos = mods.annotations.head.pos;
3840 }
3841
3842 Token tk = token;
3843 pos = token.pos;
3844 JCExpression type;
3845 boolean isVoid = token.kind == VOID;
3846 if (isVoid) {
3847 type = to(F.at(pos).TypeIdent(TypeTag.VOID));
3848 nextToken();
3849 } else {
3850 // method returns types are un-annotated types
3851 type = unannotatedType(false);
3852 }
3853 if (token.kind == LPAREN && !isInterface && type.hasTag(IDENT)) {
3854 if (isInterface || tk.name() != className)
3855 log.error(DiagnosticFlag.SYNTAX, pos, Errors.InvalidMethDeclRetTypeReq);
3856 else if (annosAfterParams.nonEmpty())
3857 illegal(annosAfterParams.head.pos);
3858 return List.of(methodDeclaratorRest(
3859 pos, mods, null, names.init, typarams,
3860 isInterface, true, dc));
3861 } else {
3862 pos = token.pos;
3863 Name name = ident();
3864 if (token.kind == LPAREN) {
3865 return List.of(methodDeclaratorRest(
3866 pos, mods, type, name, typarams,
3867 isInterface, isVoid, dc));
3868 } else if (!isVoid && typarams.isEmpty()) {
3869 List<JCTree> defs =
3870 variableDeclaratorsRest(pos, mods, type, name, isInterface, dc,
3871 new ListBuffer<JCTree>(), false).toList();
3872 accept(SEMI);
3873 storeEnd(defs.last(), S.prevToken().endPos);
3874 return defs;
3875 } else {
3876 pos = token.pos;
3877 List<JCTree> err;
3878 if (isVoid || typarams.nonEmpty()) {
3879 JCMethodDecl m =
3880 toP(F.at(pos).MethodDef(mods, name, type, typarams,
3881 List.nil(), List.nil(), null, null));
3882 attach(m, dc);
3883 err = List.of(m);
3884 } else {
3885 err = List.nil();
3886 }
3887 return List.of(syntaxError(token.pos, err, Errors.Expected(LPAREN)));
3888 }
3889 }
3890 }
3891 }
3892 }
3893
3894 /** MethodDeclaratorRest =
3895 * FormalParameters BracketsOpt [THROWS TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
3896 * VoidMethodDeclaratorRest =
3897 * FormalParameters [THROWS TypeList] ( MethodBody | ";")
3898 * ConstructorDeclaratorRest =
3899 * "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
3900 */
3901 protected JCTree methodDeclaratorRest(int pos,
3902 JCModifiers mods,
3903 JCExpression type,
3904 Name name,
3905 List<JCTypeParameter> typarams,
3906 boolean isInterface, boolean isVoid,
3907 Comment dc) {
3908 if (isInterface) {
3909 if ((mods.flags & Flags.STATIC) != 0) {
3910 checkSourceLevel(Feature.STATIC_INTERFACE_METHODS);
3911 }
3912 if ((mods.flags & Flags.PRIVATE) != 0) {
3913 checkSourceLevel(Feature.PRIVATE_INTERFACE_METHODS);
3914 }
3915 }
3916 JCVariableDecl prevReceiverParam = this.receiverParam;
3917 try {
3918 this.receiverParam = null;
3919 // Parsing formalParameters sets the receiverParam, if present
3920 List<JCVariableDecl> params = formalParameters();
3921 if (!isVoid) type = bracketsOpt(type);
3922 List<JCExpression> thrown = List.nil();
3923 if (token.kind == THROWS) {
3924 nextToken();
3925 thrown = qualidentList(true);
3926 }
3927 JCBlock body = null;
3928 JCExpression defaultValue;
3929 if (token.kind == LBRACE) {
3930 body = block();
3931 defaultValue = null;
3932 } else {
3933 if (token.kind == DEFAULT) {
3934 accept(DEFAULT);
3935 defaultValue = annotationValue();
3936 } else {
3937 defaultValue = null;
3938 }
3939 accept(SEMI);
3940 if (token.pos <= endPosTable.errorEndPos) {
3941 // error recovery
3942 skip(false, true, false, false);
3943 if (token.kind == LBRACE) {
3944 body = block();
3945 }
3946 }
3947 }
3948
3949 JCMethodDecl result =
3950 toP(F.at(pos).MethodDef(mods, name, type, typarams,
3951 receiverParam, params, thrown,
3952 body, defaultValue));
3953 attach(result, dc);
3954 return result;
3955 } finally {
3956 this.receiverParam = prevReceiverParam;
3957 }
3958 }
3959
3960 /** QualidentList = [Annotations] Qualident {"," [Annotations] Qualident}
3961 */
3962 List<JCExpression> qualidentList(boolean allowAnnos) {
3963 ListBuffer<JCExpression> ts = new ListBuffer<>();
3964
3965 List<JCAnnotation> typeAnnos = allowAnnos ? typeAnnotationsOpt() : List.nil();
3966 JCExpression qi = qualident(allowAnnos);
3967 if (!typeAnnos.isEmpty()) {
3968 JCExpression at = insertAnnotationsToMostInner(qi, typeAnnos, false);
3969 ts.append(at);
3970 } else {
3971 ts.append(qi);
3972 }
3973 while (token.kind == COMMA) {
3974 nextToken();
3975
3976 typeAnnos = allowAnnos ? typeAnnotationsOpt() : List.nil();
3977 qi = qualident(allowAnnos);
3978 if (!typeAnnos.isEmpty()) {
3979 JCExpression at = insertAnnotationsToMostInner(qi, typeAnnos, false);
3980 ts.append(at);
3981 } else {
3982 ts.append(qi);
3983 }
3984 }
3985 return ts.toList();
3986 }
3987
3988 /**
3989 * {@literal
3990 * TypeParametersOpt = ["<" TypeParameter {"," TypeParameter} ">"]
3991 * }
3992 */
3993 protected List<JCTypeParameter> typeParametersOpt() {
3994 if (token.kind == LT) {
3995 ListBuffer<JCTypeParameter> typarams = new ListBuffer<>();
3996 nextToken();
3997 typarams.append(typeParameter());
3998 while (token.kind == COMMA) {
3999 nextToken();
4000 typarams.append(typeParameter());
4001 }
4002 accept(GT);
4003 return typarams.toList();
4004 } else {
4005 return List.nil();
4006 }
4007 }
4008
4009 /**
4010 * {@literal
4011 * TypeParameter = [Annotations] TypeVariable [TypeParameterBound]
4012 * TypeParameterBound = EXTENDS Type {"&" Type}
4013 * TypeVariable = Ident
4014 * }
4015 */
4016 JCTypeParameter typeParameter() {
4017 int pos = token.pos;
4018 List<JCAnnotation> annos = typeAnnotationsOpt();
4019 Name name = typeName();
4020 ListBuffer<JCExpression> bounds = new ListBuffer<>();
4021 if (token.kind == EXTENDS) {
4022 nextToken();
4023 bounds.append(parseType());
4024 while (token.kind == AMP) {
4025 nextToken();
4026 bounds.append(parseType());
4027 }
4028 }
4029 return toP(F.at(pos).TypeParameter(name, bounds.toList(), annos));
4030 }
4031
4032 /** FormalParameters = "(" [ FormalParameterList ] ")"
4033 * FormalParameterList = [ FormalParameterListNovarargs , ] LastFormalParameter
4034 * FormalParameterListNovarargs = [ FormalParameterListNovarargs , ] FormalParameter
4035 */
4036 List<JCVariableDecl> formalParameters() {
4037 return formalParameters(false);
4038 }
4039 List<JCVariableDecl> formalParameters(boolean lambdaParameters) {
4040 ListBuffer<JCVariableDecl> params = new ListBuffer<>();
4041 JCVariableDecl lastParam;
4042 accept(LPAREN);
4043 if (token.kind != RPAREN) {
4044 this.allowThisIdent = !lambdaParameters;
4045 lastParam = formalParameter(lambdaParameters);
4046 if (lastParam.nameexpr != null) {
4047 this.receiverParam = lastParam;
4048 } else {
4049 params.append(lastParam);
4050 }
4051 this.allowThisIdent = false;
4052 while (token.kind == COMMA) {
4053 if ((lastParam.mods.flags & Flags.VARARGS) != 0) {
4054 log.error(DiagnosticFlag.SYNTAX, lastParam, Errors.VarargsMustBeLast);
4055 }
4056 nextToken();
4057 params.append(lastParam = formalParameter(lambdaParameters));
4058 }
4059 }
4060 if (token.kind == RPAREN) {
4061 nextToken();
4062 } else {
4063 setErrorEndPos(token.pos);
4064 reportSyntaxError(S.prevToken().endPos, Errors.Expected3(COMMA, RPAREN, LBRACKET));
4065 }
4066 return params.toList();
4067 }
4068
4069 List<JCVariableDecl> implicitParameters(boolean hasParens) {
4070 if (hasParens) {
4071 accept(LPAREN);
4072 }
4073 ListBuffer<JCVariableDecl> params = new ListBuffer<>();
4074 if (token.kind != RPAREN && token.kind != ARROW) {
4075 params.append(implicitParameter());
4076 while (token.kind == COMMA) {
4077 nextToken();
4078 params.append(implicitParameter());
4079 }
4080 }
4081 if (hasParens) {
4082 accept(RPAREN);
4083 }
4084 return params.toList();
4085 }
4086
4087 JCModifiers optFinal(long flags) {
4088 JCModifiers mods = modifiersOpt();
4089 checkNoMods(mods.flags & ~(Flags.FINAL | Flags.DEPRECATED));
4090 mods.flags |= flags;
4091 return mods;
4092 }
4093
4094 /**
4095 * Inserts the annotations (and possibly a new array level)
4096 * to the left-most type in an array or nested type.
4097 *
4098 * When parsing a type like {@code @B Outer.Inner @A []}, the
4099 * {@code @A} annotation should target the array itself, while
4100 * {@code @B} targets the nested type {@code Outer}.
4101 *
4102 * Currently the parser parses the annotation first, then
4103 * the array, and then inserts the annotation to the left-most
4104 * nested type.
4105 *
4106 * When {@code createNewLevel} is true, then a new array
4107 * level is inserted as the most inner type, and have the
4108 * annotations target it. This is useful in the case of
4109 * varargs, e.g. {@code String @A [] @B ...}, as the parser
4110 * first parses the type {@code String @A []} then inserts
4111 * a new array level with {@code @B} annotation.
4112 */
4113 private JCExpression insertAnnotationsToMostInner(
4114 JCExpression type, List<JCAnnotation> annos,
4115 boolean createNewLevel) {
4116 int origEndPos = getEndPos(type);
4117 JCExpression mostInnerType = type;
4118 JCArrayTypeTree mostInnerArrayType = null;
4119 while (TreeInfo.typeIn(mostInnerType).hasTag(TYPEARRAY)) {
4120 mostInnerArrayType = (JCArrayTypeTree) TreeInfo.typeIn(mostInnerType);
4121 mostInnerType = mostInnerArrayType.elemtype;
4122 }
4123
4124 if (createNewLevel) {
4125 mostInnerType = to(F.at(token.pos).TypeArray(mostInnerType));
4126 }
4127
4128 JCExpression mostInnerTypeToReturn = mostInnerType;
4129 if (annos.nonEmpty()) {
4130 JCExpression lastToModify = mostInnerType;
4131
4132 while (TreeInfo.typeIn(mostInnerType).hasTag(SELECT) ||
4133 TreeInfo.typeIn(mostInnerType).hasTag(TYPEAPPLY)) {
4134 while (TreeInfo.typeIn(mostInnerType).hasTag(SELECT)) {
4135 lastToModify = mostInnerType;
4136 mostInnerType = ((JCFieldAccess) TreeInfo.typeIn(mostInnerType)).getExpression();
4137 }
4138 while (TreeInfo.typeIn(mostInnerType).hasTag(TYPEAPPLY)) {
4139 lastToModify = mostInnerType;
4140 mostInnerType = ((JCTypeApply) TreeInfo.typeIn(mostInnerType)).clazz;
4141 }
4142 }
4143
4144 mostInnerType = F.at(annos.head.pos).AnnotatedType(annos, mostInnerType);
4145
4146 if (TreeInfo.typeIn(lastToModify).hasTag(TYPEAPPLY)) {
4147 ((JCTypeApply) TreeInfo.typeIn(lastToModify)).clazz = mostInnerType;
4148 } else if (TreeInfo.typeIn(lastToModify).hasTag(SELECT)) {
4149 ((JCFieldAccess) TreeInfo.typeIn(lastToModify)).selected = mostInnerType;
4150 } else {
4151 // We never saw a SELECT or TYPEAPPLY, return the annotated type.
4152 mostInnerTypeToReturn = mostInnerType;
4153 }
4154 }
4155
4156 if (mostInnerArrayType == null) {
4157 return mostInnerTypeToReturn;
4158 } else {
4159 mostInnerArrayType.elemtype = mostInnerTypeToReturn;
4160 storeEnd(type, origEndPos);
4161 return type;
4162 }
4163 }
4164
4165 /** FormalParameter = { FINAL | '@' Annotation } Type VariableDeclaratorId
4166 * LastFormalParameter = { FINAL | '@' Annotation } Type '...' Ident | FormalParameter
4167 */
4168 protected JCVariableDecl formalParameter() {
4169 return formalParameter(false);
4170 }
4171 protected JCVariableDecl formalParameter(boolean lambdaParameter) {
4172 JCModifiers mods = optFinal(Flags.PARAMETER);
4173 // need to distinguish between vararg annos and array annos
4174 // look at typeAnnotationsPushedBack comment
4175 this.permitTypeAnnotationsPushBack = true;
4176 JCExpression type = parseType(lambdaParameter);
4177 this.permitTypeAnnotationsPushBack = false;
4178
4179 if (token.kind == ELLIPSIS) {
4180 List<JCAnnotation> varargsAnnos = typeAnnotationsPushedBack;
4181 typeAnnotationsPushedBack = List.nil();
4182 mods.flags |= Flags.VARARGS;
4183 // insert var arg type annotations
4184 type = insertAnnotationsToMostInner(type, varargsAnnos, true);
4185 nextToken();
4186 } else {
4187 // if not a var arg, then typeAnnotationsPushedBack should be null
4188 if (typeAnnotationsPushedBack.nonEmpty()) {
4189 reportSyntaxError(typeAnnotationsPushedBack.head.pos, Errors.IllegalStartOfType);
4190 }
4191 typeAnnotationsPushedBack = List.nil();
4192 }
4193 return variableDeclaratorId(mods, type, lambdaParameter);
4194 }
4195
4196 protected JCVariableDecl implicitParameter() {
4197 JCModifiers mods = F.at(token.pos).Modifiers(Flags.PARAMETER);
4198 return variableDeclaratorId(mods, null, true);
4199 }
4200
4201 /* ---------- auxiliary methods -------------- */
4202 /** Check that given tree is a legal expression statement.
4203 */
4204 protected JCExpression checkExprStat(JCExpression t) {
4205 if (!TreeInfo.isExpressionStatement(t)) {
4206 JCExpression ret = F.at(t.pos).Erroneous(List.<JCTree>of(t));
4207 log.error(DiagnosticFlag.SYNTAX, ret, Errors.NotStmt);
4208 return ret;
4209 } else {
4210 return t;
4211 }
4212 }
4213
4214 /** Return precedence of operator represented by token,
4215 * -1 if token is not a binary operator. @see TreeInfo.opPrec
4216 */
4217 static int prec(TokenKind token) {
4218 JCTree.Tag oc = optag(token);
4219 return (oc != NO_TAG) ? TreeInfo.opPrec(oc) : -1;
4220 }
4221
4222 /**
4223 * Return the lesser of two positions, making allowance for either one
4224 * being unset.
4225 */
4226 static int earlier(int pos1, int pos2) {
4227 if (pos1 == Position.NOPOS)
4228 return pos2;
4229 if (pos2 == Position.NOPOS)
4230 return pos1;
4231 return (pos1 < pos2 ? pos1 : pos2);
4232 }
4233
4234 /** Return operation tag of binary operator represented by token,
4235 * No_TAG if token is not a binary operator.
4236 */
4237 static JCTree.Tag optag(TokenKind token) {
4238 switch (token) {
4239 case BARBAR:
4240 return OR;
4241 case AMPAMP:
4242 return AND;
4243 case BAR:
4244 return BITOR;
4245 case BAREQ:
4246 return BITOR_ASG;
4247 case CARET:
4248 return BITXOR;
4249 case CARETEQ:
4250 return BITXOR_ASG;
4251 case AMP:
4252 return BITAND;
4253 case AMPEQ:
4254 return BITAND_ASG;
4255 case EQEQ:
4256 return JCTree.Tag.EQ;
4257 case BANGEQ:
4258 return NE;
4259 case LT:
4260 return JCTree.Tag.LT;
4261 case GT:
4262 return JCTree.Tag.GT;
4263 case LTEQ:
4264 return LE;
4265 case GTEQ:
4266 return GE;
4267 case LTLT:
4268 return SL;
4269 case LTLTEQ:
4270 return SL_ASG;
4271 case GTGT:
4272 return SR;
4273 case GTGTEQ:
4274 return SR_ASG;
4275 case GTGTGT:
4276 return USR;
4277 case GTGTGTEQ:
4278 return USR_ASG;
4279 case PLUS:
4280 return JCTree.Tag.PLUS;
4281 case PLUSEQ:
4282 return PLUS_ASG;
4283 case SUB:
4284 return MINUS;
4285 case SUBEQ:
4286 return MINUS_ASG;
4287 case STAR:
4288 return MUL;
4289 case STAREQ:
4290 return MUL_ASG;
4291 case SLASH:
4292 return DIV;
4293 case SLASHEQ:
4294 return DIV_ASG;
4295 case PERCENT:
4296 return MOD;
4297 case PERCENTEQ:
4298 return MOD_ASG;
4299 case INSTANCEOF:
4300 return TYPETEST;
4301 default:
4302 return NO_TAG;
4303 }
4304 }
4305
4306 /** Return operation tag of unary operator represented by token,
4307 * No_TAG if token is not a binary operator.
4308 */
4309 static JCTree.Tag unoptag(TokenKind token) {
4310 switch (token) {
4311 case PLUS:
4312 return POS;
4313 case SUB:
4314 return NEG;
4315 case BANG:
4316 return NOT;
4317 case TILDE:
4318 return COMPL;
4319 case PLUSPLUS:
4320 return PREINC;
4321 case SUBSUB:
4322 return PREDEC;
4323 default:
4324 return NO_TAG;
4325 }
4326 }
4327
4328 /** Return type tag of basic type represented by token,
4329 * NONE if token is not a basic type identifier.
4330 */
4331 static TypeTag typetag(TokenKind token) {
4332 switch (token) {
4333 case BYTE:
4334 return TypeTag.BYTE;
4335 case CHAR:
4336 return TypeTag.CHAR;
4337 case SHORT:
4338 return TypeTag.SHORT;
4339 case INT:
4340 return TypeTag.INT;
4341 case LONG:
4342 return TypeTag.LONG;
4343 case FLOAT:
4344 return TypeTag.FLOAT;
4345 case DOUBLE:
4346 return TypeTag.DOUBLE;
4347 case BOOLEAN:
4348 return TypeTag.BOOLEAN;
4349 default:
4350 return TypeTag.NONE;
4351 }
4352 }
4353
4354 void checkSourceLevel(Feature feature) {
4355 checkSourceLevel(token.pos, feature);
4356 }
4357
4358 protected void checkSourceLevel(int pos, Feature feature) {
4359 if (preview.isPreview(feature) && !preview.isEnabled()) {
4360 //preview feature without --preview flag, error
4361 log.error(DiagnosticFlag.SOURCE_LEVEL, pos, preview.disabledError(feature));
4362 } else if (!feature.allowedInSource(source)) {
4363 //incompatible source level, error
4364 log.error(DiagnosticFlag.SOURCE_LEVEL, pos, feature.error(source.name));
4365 } else if (preview.isPreview(feature)) {
4366 //use of preview feature, warn
4367 preview.warnPreview(pos, feature);
4368 }
4369 }
4370
4371 /*
4372 * a functional source tree and end position mappings
4373 */
4374 protected static class SimpleEndPosTable extends AbstractEndPosTable {
4375
4376 private final IntHashTable endPosMap;
4377
4378 SimpleEndPosTable(JavacParser parser) {
4379 super(parser);
4380 endPosMap = new IntHashTable();
4381 }
4382
4383 public void storeEnd(JCTree tree, int endpos) {
4384 endPosMap.putAtIndex(tree, errorEndPos > endpos ? errorEndPos : endpos,
4385 endPosMap.lookup(tree));
4386 }
4387
4388 protected <T extends JCTree> T to(T t) {
4389 storeEnd(t, parser.token.endPos);
4390 return t;
4391 }
4392
4393 protected <T extends JCTree> T toP(T t) {
4394 storeEnd(t, parser.S.prevToken().endPos);
4395 return t;
4396 }
4397
4398 public int getEndPos(JCTree tree) {
4399 int value = endPosMap.getFromIndex(endPosMap.lookup(tree));
4400 // As long as Position.NOPOS==-1, this just returns value.
4401 return (value == -1) ? Position.NOPOS : value;
4402 }
4403
4404 public int replaceTree(JCTree oldTree, JCTree newTree) {
4405 int pos = endPosMap.remove(oldTree);
4406 if (pos != -1) {
4407 storeEnd(newTree, pos);
4408 return pos;
4409 }
4410 return Position.NOPOS;
4411 }
4412 }
4413
4414 /*
4415 * a default skeletal implementation without any mapping overhead.
4416 */
4417 protected static class EmptyEndPosTable extends AbstractEndPosTable {
4418
4419 EmptyEndPosTable(JavacParser parser) {
4420 super(parser);
4421 }
4422
4423 public void storeEnd(JCTree tree, int endpos) { /* empty */ }
4424
4425 protected <T extends JCTree> T to(T t) {
4426 return t;
4427 }
4428
4429 protected <T extends JCTree> T toP(T t) {
4430 return t;
4431 }
4432
4433 public int getEndPos(JCTree tree) {
4434 return Position.NOPOS;
4435 }
4436
4437 public int replaceTree(JCTree oldTree, JCTree newTree) {
4438 return Position.NOPOS;
4439 }
4440
4441 }
4442
4443 protected static abstract class AbstractEndPosTable implements EndPosTable {
4444 /**
4445 * The current parser.
4446 */
4447 protected JavacParser parser;
4448
4449 /**
4450 * Store the last error position.
4451 */
4452 public int errorEndPos = Position.NOPOS;
4453
4454 public AbstractEndPosTable(JavacParser parser) {
4455 this.parser = parser;
4456 }
4457
4458 /**
4459 * Store current token's ending position for a tree, the value of which
4460 * will be the greater of last error position and the ending position of
4461 * the current token.
4462 * @param t The tree.
4463 */
4464 protected abstract <T extends JCTree> T to(T t);
4465
4466 /**
4467 * Store current token's ending position for a tree, the value of which
4468 * will be the greater of last error position and the ending position of
4469 * the previous token.
4470 * @param t The tree.
4471 */
4472 protected abstract <T extends JCTree> T toP(T t);
4473
4474 /**
4475 * Set the error position during the parsing phases, the value of which
4476 * will be set only if it is greater than the last stored error position.
4477 * @param errPos The error position
4478 */
4479 public void setErrorEndPos(int errPos) {
4480 if (errPos > errorEndPos) {
4481 errorEndPos = errPos;
4482 }
4483 }
4484
4485 public void setParser(JavacParser parser) {
4486 this.parser = parser;
4487 }
4488 }
4489 }