J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2004 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.tools.java; |
| 27 | |
| 28 | import sun.tools.tree.*; |
| 29 | import java.io.IOException; |
| 30 | import java.io.InputStream; |
| 31 | import java.util.Enumeration; |
| 32 | import java.util.Vector; |
| 33 | |
| 34 | /** |
| 35 | * This class is used to parse Java statements and expressions. |
| 36 | * The result is a parse tree.<p> |
| 37 | * |
| 38 | * This class implements an operator precedence parser. Errors are |
| 39 | * reported to the Environment object, if the error can't be |
| 40 | * resolved immediately, a SyntaxError exception is thrown.<p> |
| 41 | * |
| 42 | * Error recovery is implemented by catching SyntaxError exceptions |
| 43 | * and discarding input tokens until an input token is reached that |
| 44 | * is possibly a legal continuation.<p> |
| 45 | * |
| 46 | * The parse tree that is constructed represents the input |
| 47 | * exactly (no rewrites to simpler forms). This is important |
| 48 | * if the resulting tree is to be used for code formatting in |
| 49 | * a programming environment. Currently only documentation comments |
| 50 | * are retained.<p> |
| 51 | * |
| 52 | * The parsing algorithm does NOT use any type information. Changes |
| 53 | * in the type system do not affect the structure of the parse tree. |
| 54 | * This restriction does introduce an ambiguity an expression of the |
| 55 | * form: (e1) e2 is assumed to be a cast if e2 does not start with |
| 56 | * an operator. That means that (a) - b is interpreted as subtract |
| 57 | * b from a and not cast negative b to type a. However, if a is a |
| 58 | * simple type (byte, int, ...) then it is assumed to be a cast.<p> |
| 59 | * |
| 60 | * WARNING: The contents of this source file are not part of any |
| 61 | * supported API. Code that depends on them does so at its own risk: |
| 62 | * they are subject to change or removal without notice. |
| 63 | * |
| 64 | * @author Arthur van Hoff |
| 65 | */ |
| 66 | |
| 67 | public |
| 68 | class Parser extends Scanner implements ParserActions, Constants { |
| 69 | /** |
| 70 | * Create a parser |
| 71 | */ |
| 72 | protected Parser(Environment env, InputStream in) throws IOException { |
| 73 | super(env, in); |
| 74 | this.scanner = this; |
| 75 | this.actions = this; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Create a parser, given a scanner. |
| 80 | */ |
| 81 | protected Parser(Scanner scanner) throws IOException { |
| 82 | super(scanner.env); |
| 83 | this.scanner = scanner; |
| 84 | ((Scanner)this).env = scanner.env; |
| 85 | ((Scanner)this).token = scanner.token; |
| 86 | ((Scanner)this).pos = scanner.pos; |
| 87 | this.actions = this; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Create a parser, given a scanner and the semantic callback. |
| 92 | */ |
| 93 | public Parser(Scanner scanner, ParserActions actions) throws IOException { |
| 94 | this(scanner); |
| 95 | this.actions = actions; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Usually <code>this.actions == (ParserActions)this</code>. |
| 100 | * However, a delegate scanner can produce tokens for this parser, |
| 101 | * in which case <code>(Scanner)this</code> is unused, |
| 102 | * except for <code>this.token</code> and <code>this.pos</code> |
| 103 | * instance variables which are filled from the real scanner |
| 104 | * by <code>this.scan()</code> and the constructor. |
| 105 | */ |
| 106 | ParserActions actions; |
| 107 | |
| 108 | // Note: The duplication of methods allows pre-1.1 classes to |
| 109 | // be binary compatible with the new version of the parser, |
| 110 | // which now passes IdentifierTokens to the semantics phase, |
| 111 | // rather than just Identifiers. This change is necessary, |
| 112 | // since the parser is no longer responsible for managing the |
| 113 | // resolution of type names. (That caused the "Vector" bug.) |
| 114 | // |
| 115 | // In a future release, the old "plain-Identifier" methods will |
| 116 | // go away, and the corresponding "IdentifierToken" methods |
| 117 | // may become abstract. |
| 118 | |
| 119 | /** |
| 120 | * package declaration |
| 121 | * @deprecated |
| 122 | */ |
| 123 | @Deprecated |
| 124 | public void packageDeclaration(long off, IdentifierToken nm) { |
| 125 | // By default, call the deprecated version. |
| 126 | // Any application must override one of the packageDeclaration methods. |
| 127 | packageDeclaration(off, nm.id); |
| 128 | } |
| 129 | /** |
| 130 | * @deprecated |
| 131 | */ |
| 132 | @Deprecated |
| 133 | protected void packageDeclaration(long off, Identifier nm) { |
| 134 | throw new RuntimeException("beginClass method is abstract"); |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * import class |
| 139 | * @deprecated |
| 140 | */ |
| 141 | @Deprecated |
| 142 | public void importClass(long off, IdentifierToken nm) { |
| 143 | // By default, call the deprecated version. |
| 144 | // Any application must override one of the packageDeclaration methods. |
| 145 | importClass(off, nm.id); |
| 146 | } |
| 147 | /** |
| 148 | * @deprecated Use the version with the IdentifierToken arguments. |
| 149 | */ |
| 150 | @Deprecated |
| 151 | protected void importClass(long off, Identifier nm) { |
| 152 | throw new RuntimeException("importClass method is abstract"); |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * import package |
| 157 | * @deprecated |
| 158 | */ |
| 159 | @Deprecated |
| 160 | public void importPackage(long off, IdentifierToken nm) { |
| 161 | // By default, call the deprecated version. |
| 162 | // Any application must override one of the importPackage methods. |
| 163 | importPackage(off, nm.id); |
| 164 | } |
| 165 | /** |
| 166 | * @deprecated Use the version with the IdentifierToken arguments. |
| 167 | */ |
| 168 | @Deprecated |
| 169 | protected void importPackage(long off, Identifier nm) { |
| 170 | throw new RuntimeException("importPackage method is abstract"); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Define class |
| 175 | * @deprecated |
| 176 | */ |
| 177 | @Deprecated |
| 178 | public ClassDefinition beginClass(long off, String doc, |
| 179 | int mod, IdentifierToken nm, |
| 180 | IdentifierToken sup, |
| 181 | IdentifierToken impl[]) { |
| 182 | // By default, call the deprecated version. |
| 183 | // Any application must override one of the beginClass methods. |
| 184 | Identifier supId = (sup == null) ? null : sup.id; |
| 185 | Identifier implIds[] = null; |
| 186 | if (impl != null) { |
| 187 | implIds = new Identifier[impl.length]; |
| 188 | for (int i = 0; i < impl.length; i++) { |
| 189 | implIds[i] = impl[i].id; |
| 190 | } |
| 191 | } |
| 192 | beginClass(off, doc, mod, nm.id, supId, implIds); |
| 193 | return getCurrentClass(); |
| 194 | } |
| 195 | /** |
| 196 | * @deprecated Use the version with the IdentifierToken arguments. |
| 197 | */ |
| 198 | @Deprecated |
| 199 | protected void beginClass(long off, String doc, int mod, Identifier nm, |
| 200 | Identifier sup, Identifier impl[]) { |
| 201 | throw new RuntimeException("beginClass method is abstract"); |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Report the current class under construction. |
| 206 | * By default, it's a no-op which returns null. |
| 207 | * It may only be called before the corresponding endClass(). |
| 208 | */ |
| 209 | protected ClassDefinition getCurrentClass() { |
| 210 | return null; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * End class |
| 215 | * @deprecated |
| 216 | */ |
| 217 | @Deprecated |
| 218 | public void endClass(long off, ClassDefinition c) { |
| 219 | // By default, call the deprecated version. |
| 220 | // Any application must override one of the beginClass methods. |
| 221 | endClass(off, c.getName().getFlatName().getName()); |
| 222 | } |
| 223 | /** |
| 224 | * @deprecated Use the version with the IdentifierToken arguments. |
| 225 | */ |
| 226 | @Deprecated |
| 227 | protected void endClass(long off, Identifier nm) { |
| 228 | throw new RuntimeException("endClass method is abstract"); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Define a field |
| 233 | * @deprecated |
| 234 | */ |
| 235 | @Deprecated |
| 236 | public void defineField(long where, ClassDefinition c, |
| 237 | String doc, int mod, Type t, |
| 238 | IdentifierToken nm, IdentifierToken args[], |
| 239 | IdentifierToken exp[], Node val) { |
| 240 | // By default, call the deprecated version. |
| 241 | // Any application must override one of the defineField methods. |
| 242 | Identifier argIds[] = null; |
| 243 | Identifier expIds[] = null; |
| 244 | if (args != null) { |
| 245 | argIds = new Identifier[args.length]; |
| 246 | for (int i = 0; i < args.length; i++) { |
| 247 | argIds[i] = args[i].id; |
| 248 | } |
| 249 | } |
| 250 | if (exp != null) { |
| 251 | expIds = new Identifier[exp.length]; |
| 252 | for (int i = 0; i < exp.length; i++) { |
| 253 | expIds[i] = exp[i].id; |
| 254 | } |
| 255 | } |
| 256 | defineField(where, doc, mod, t, nm.id, argIds, expIds, val); |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * @deprecated Use the version with the IdentifierToken arguments. |
| 261 | */ |
| 262 | @Deprecated |
| 263 | protected void defineField(long where, String doc, int mod, Type t, |
| 264 | Identifier nm, Identifier args[], |
| 265 | Identifier exp[], Node val) { |
| 266 | throw new RuntimeException("defineField method is abstract"); |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * A growable array of nodes. It is used as a growable |
| 271 | * buffer to hold argument lists and expression lists. |
| 272 | * I'm not using Vector to make it more efficient. |
| 273 | */ |
| 274 | private Node args[] = new Node[32]; |
| 275 | protected int argIndex = 0; |
| 276 | |
| 277 | protected final void addArgument(Node n) { |
| 278 | if (argIndex == args.length) { |
| 279 | Node newArgs[] = new Node[args.length * 2]; |
| 280 | System.arraycopy(args, 0, newArgs, 0, args.length); |
| 281 | args = newArgs; |
| 282 | } |
| 283 | args[argIndex++] = n; |
| 284 | } |
| 285 | protected final Expression exprArgs(int index)[] { |
| 286 | Expression e[] = new Expression[argIndex - index]; |
| 287 | System.arraycopy(args, index, e, 0, argIndex - index); |
| 288 | argIndex = index; |
| 289 | return e; |
| 290 | } |
| 291 | protected final Statement statArgs(int index)[] { |
| 292 | Statement s[] = new Statement[argIndex - index]; |
| 293 | System.arraycopy(args, index, s, 0, argIndex - index); |
| 294 | argIndex = index; |
| 295 | return s; |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Expect a token, return its value, scan the next token or |
| 300 | * throw an exception. |
| 301 | */ |
| 302 | protected void expect(int t) throws SyntaxError, IOException { |
| 303 | if (token != t) { |
| 304 | switch (t) { |
| 305 | case IDENT: |
| 306 | env.error(scanner.prevPos, "identifier.expected"); |
| 307 | break; |
| 308 | default: |
| 309 | env.error(scanner.prevPos, "token.expected", opNames[t]); |
| 310 | break; |
| 311 | } |
| 312 | throw new SyntaxError(); |
| 313 | } |
| 314 | scan(); |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * Parse a type expression. Does not parse the []'s. |
| 319 | */ |
| 320 | protected Expression parseTypeExpression() throws SyntaxError, IOException { |
| 321 | switch (token) { |
| 322 | case VOID: |
| 323 | return new TypeExpression(scan(), Type.tVoid); |
| 324 | case BOOLEAN: |
| 325 | return new TypeExpression(scan(), Type.tBoolean); |
| 326 | case BYTE: |
| 327 | return new TypeExpression(scan(), Type.tByte); |
| 328 | case CHAR: |
| 329 | return new TypeExpression(scan(), Type.tChar); |
| 330 | case SHORT: |
| 331 | return new TypeExpression(scan(), Type.tShort); |
| 332 | case INT: |
| 333 | return new TypeExpression(scan(), Type.tInt); |
| 334 | case LONG: |
| 335 | return new TypeExpression(scan(), Type.tLong); |
| 336 | case FLOAT: |
| 337 | return new TypeExpression(scan(), Type.tFloat); |
| 338 | case DOUBLE: |
| 339 | return new TypeExpression(scan(), Type.tDouble); |
| 340 | case IDENT: |
| 341 | Expression e = new IdentifierExpression(pos, scanner.idValue); |
| 342 | scan(); |
| 343 | while (token == FIELD) { |
| 344 | e = new FieldExpression(scan(), e, scanner.idValue); |
| 345 | expect(IDENT); |
| 346 | } |
| 347 | return e; |
| 348 | } |
| 349 | |
| 350 | env.error(pos, "type.expected"); |
| 351 | throw new SyntaxError(); |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * Parse a method invocation. Should be called when the current |
| 356 | * then is the '(' of the argument list. |
| 357 | */ |
| 358 | protected Expression parseMethodExpression(Expression e, Identifier id) throws SyntaxError, IOException { |
| 359 | long p = scan(); |
| 360 | int i = argIndex; |
| 361 | if (token != RPAREN) { |
| 362 | addArgument(parseExpression()); |
| 363 | while (token == COMMA) { |
| 364 | scan(); |
| 365 | addArgument(parseExpression()); |
| 366 | } |
| 367 | } |
| 368 | expect(RPAREN); |
| 369 | return new MethodExpression(p, e, id, exprArgs(i)); |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * Parse a new instance expression. Should be called when the current |
| 374 | * token is the '(' of the argument list. |
| 375 | */ |
| 376 | protected Expression parseNewInstanceExpression(long p, Expression outerArg, Expression type) throws SyntaxError, IOException { |
| 377 | int i = argIndex; |
| 378 | expect(LPAREN); |
| 379 | if (token != RPAREN) { |
| 380 | addArgument(parseExpression()); |
| 381 | while (token == COMMA) { |
| 382 | scan(); |
| 383 | addArgument(parseExpression()); |
| 384 | } |
| 385 | } |
| 386 | expect(RPAREN); |
| 387 | ClassDefinition body = null; |
| 388 | if (token == LBRACE && !(type instanceof TypeExpression)) { |
| 389 | long tp = pos; |
| 390 | // x = new Type(arg) { subclass body ... } |
| 391 | Identifier superName = FieldExpression.toIdentifier(type); |
| 392 | if (superName == null) { |
| 393 | env.error(type.getWhere(), "type.expected"); |
| 394 | } |
| 395 | Vector ext = new Vector(1); |
| 396 | Vector impl = new Vector(0); |
| 397 | ext.addElement(new IdentifierToken(idNull)); |
| 398 | if (token == IMPLEMENTS || token == EXTENDS) { |
| 399 | env.error(pos, "anonymous.extends"); |
| 400 | parseInheritance(ext, impl); // error recovery |
| 401 | } |
| 402 | body = parseClassBody(new IdentifierToken(tp, idNull), |
| 403 | M_ANONYMOUS | M_LOCAL, EXPR, null, |
| 404 | ext, impl, type.getWhere()); |
| 405 | } |
| 406 | if (outerArg == null && body == null) { |
| 407 | return new NewInstanceExpression(p, type, exprArgs(i)); |
| 408 | } |
| 409 | return new NewInstanceExpression(p, type, exprArgs(i), outerArg, body); |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Parse a primary expression. |
| 414 | */ |
| 415 | protected Expression parseTerm() throws SyntaxError, IOException { |
| 416 | switch (token) { |
| 417 | case CHARVAL: { |
| 418 | char v = scanner.charValue; |
| 419 | return new CharExpression(scan(), v); |
| 420 | } |
| 421 | case INTVAL: { |
| 422 | int v = scanner.intValue; |
| 423 | long q = scan(); |
| 424 | if (v < 0 && radix == 10) env.error(q, "overflow.int.dec"); |
| 425 | return new IntExpression(q, v); |
| 426 | } |
| 427 | case LONGVAL: { |
| 428 | long v = scanner.longValue; |
| 429 | long q = scan(); |
| 430 | if (v < 0 && radix == 10) env.error(q, "overflow.long.dec"); |
| 431 | return new LongExpression(q, v); |
| 432 | } |
| 433 | case FLOATVAL: { |
| 434 | float v = scanner.floatValue; |
| 435 | return new FloatExpression(scan(), v); |
| 436 | } |
| 437 | case DOUBLEVAL: { |
| 438 | double v = scanner.doubleValue; |
| 439 | return new DoubleExpression(scan(), v); |
| 440 | } |
| 441 | case STRINGVAL: { |
| 442 | String v = scanner.stringValue; |
| 443 | return new StringExpression(scan(), v); |
| 444 | } |
| 445 | case IDENT: { |
| 446 | Identifier v = scanner.idValue; |
| 447 | long p = scan(); |
| 448 | return (token == LPAREN) ? |
| 449 | parseMethodExpression(null, v) : new IdentifierExpression(p, v); |
| 450 | } |
| 451 | |
| 452 | case TRUE: |
| 453 | return new BooleanExpression(scan(), true); |
| 454 | case FALSE: |
| 455 | return new BooleanExpression(scan(), false); |
| 456 | case NULL: |
| 457 | return new NullExpression(scan()); |
| 458 | |
| 459 | case THIS: { |
| 460 | Expression e = new ThisExpression(scan()); |
| 461 | return (token == LPAREN) ? parseMethodExpression(e, idInit) : e; |
| 462 | } |
| 463 | case SUPER: { |
| 464 | Expression e = new SuperExpression(scan()); |
| 465 | return (token == LPAREN) ? parseMethodExpression(e, idInit) : e; |
| 466 | } |
| 467 | |
| 468 | case VOID: |
| 469 | case BOOLEAN: |
| 470 | case BYTE: |
| 471 | case CHAR: |
| 472 | case SHORT: |
| 473 | case INT: |
| 474 | case LONG: |
| 475 | case FLOAT: |
| 476 | case DOUBLE: |
| 477 | return parseTypeExpression(); |
| 478 | |
| 479 | case ADD: { |
| 480 | long p = scan(); |
| 481 | switch (token) { |
| 482 | case INTVAL: { |
| 483 | int v = scanner.intValue; |
| 484 | long q = scan(); |
| 485 | if (v < 0 && radix == 10) env.error(q, "overflow.int.dec"); |
| 486 | return new IntExpression(q, v); |
| 487 | } |
| 488 | case LONGVAL: { |
| 489 | long v = scanner.longValue; |
| 490 | long q = scan(); |
| 491 | if (v < 0 && radix == 10) env.error(q, "overflow.long.dec"); |
| 492 | return new LongExpression(q, v); |
| 493 | } |
| 494 | case FLOATVAL: { |
| 495 | float v = scanner.floatValue; |
| 496 | return new FloatExpression(scan(), v); |
| 497 | } |
| 498 | case DOUBLEVAL: { |
| 499 | double v = scanner.doubleValue; |
| 500 | return new DoubleExpression(scan(), v); |
| 501 | } |
| 502 | } |
| 503 | return new PositiveExpression(p, parseTerm()); |
| 504 | } |
| 505 | case SUB: { |
| 506 | long p = scan(); |
| 507 | switch (token) { |
| 508 | case INTVAL: { |
| 509 | int v = -scanner.intValue; |
| 510 | return new IntExpression(scan(), v); |
| 511 | } |
| 512 | case LONGVAL: { |
| 513 | long v = -scanner.longValue; |
| 514 | return new LongExpression(scan(), v); |
| 515 | } |
| 516 | case FLOATVAL: { |
| 517 | float v = -scanner.floatValue; |
| 518 | return new FloatExpression(scan(), v); |
| 519 | } |
| 520 | case DOUBLEVAL: { |
| 521 | double v = -scanner.doubleValue; |
| 522 | return new DoubleExpression(scan(), v); |
| 523 | } |
| 524 | } |
| 525 | return new NegativeExpression(p, parseTerm()); |
| 526 | } |
| 527 | case NOT: |
| 528 | return new NotExpression(scan(), parseTerm()); |
| 529 | case BITNOT: |
| 530 | return new BitNotExpression(scan(), parseTerm()); |
| 531 | case INC: |
| 532 | return new PreIncExpression(scan(), parseTerm()); |
| 533 | case DEC: |
| 534 | return new PreDecExpression(scan(), parseTerm()); |
| 535 | |
| 536 | case LPAREN: { |
| 537 | // bracketed-expr: (expr) |
| 538 | long p = scan(); |
| 539 | Expression e = parseExpression(); |
| 540 | expect(RPAREN); |
| 541 | |
| 542 | if (e.getOp() == TYPE) { |
| 543 | // cast-expr: (simple-type) expr |
| 544 | return new CastExpression(p, e, parseTerm()); |
| 545 | } |
| 546 | |
| 547 | switch (token) { |
| 548 | |
| 549 | // We handle INC and DEC specially. |
| 550 | // See the discussion in JLS section 15.14.1. |
| 551 | // (Part of fix for 4044502.) |
| 552 | |
| 553 | case INC: |
| 554 | // We know this must be a postfix increment. |
| 555 | return new PostIncExpression(scan(), e); |
| 556 | |
| 557 | case DEC: |
| 558 | // We know this must be a postfix decrement. |
| 559 | return new PostDecExpression(scan(), e); |
| 560 | |
| 561 | case LPAREN: |
| 562 | case CHARVAL: |
| 563 | case INTVAL: |
| 564 | case LONGVAL: |
| 565 | case FLOATVAL: |
| 566 | case DOUBLEVAL: |
| 567 | case STRINGVAL: |
| 568 | case IDENT: |
| 569 | case TRUE: |
| 570 | case FALSE: |
| 571 | case NOT: |
| 572 | case BITNOT: |
| 573 | case THIS: |
| 574 | case SUPER: |
| 575 | case NULL: |
| 576 | case NEW: |
| 577 | // cast-expr: (expr) expr |
| 578 | return new CastExpression(p, e, parseTerm()); |
| 579 | } |
| 580 | return new ExprExpression(p, e); |
| 581 | } |
| 582 | |
| 583 | case LBRACE: { |
| 584 | // array initializer: {expr1, expr2, ... exprn} |
| 585 | long p = scan(); |
| 586 | int i = argIndex; |
| 587 | if (token != RBRACE) { |
| 588 | addArgument(parseExpression()); |
| 589 | while (token == COMMA) { |
| 590 | scan(); |
| 591 | if (token == RBRACE) { |
| 592 | break; |
| 593 | } |
| 594 | addArgument(parseExpression()); |
| 595 | } |
| 596 | } |
| 597 | expect(RBRACE); |
| 598 | return new ArrayExpression(p, exprArgs(i)); |
| 599 | } |
| 600 | |
| 601 | case NEW: { |
| 602 | long p = scan(); |
| 603 | int i = argIndex; |
| 604 | |
| 605 | if (token == LPAREN) { |
| 606 | scan(); |
| 607 | Expression e = parseExpression(); |
| 608 | expect(RPAREN); |
| 609 | env.error(p, "not.supported", "new(...)"); |
| 610 | return new NullExpression(p); |
| 611 | } |
| 612 | |
| 613 | Expression e = parseTypeExpression(); |
| 614 | |
| 615 | if (token == LSQBRACKET) { |
| 616 | while (token == LSQBRACKET) { |
| 617 | scan(); |
| 618 | addArgument((token != RSQBRACKET) ? parseExpression() : null); |
| 619 | expect(RSQBRACKET); |
| 620 | } |
| 621 | Expression[] dims = exprArgs(i); |
| 622 | if (token == LBRACE) { |
| 623 | return new NewArrayExpression(p, e, dims, parseTerm()); |
| 624 | } |
| 625 | return new NewArrayExpression(p, e, dims); |
| 626 | } else { |
| 627 | return parseNewInstanceExpression(p, null, e); |
| 628 | } |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | // System.err.println("NEAR: " + opNames[token]); |
| 633 | env.error(scanner.prevPos, "missing.term"); |
| 634 | return new IntExpression(pos, 0); |
| 635 | } |
| 636 | |
| 637 | /** |
| 638 | * Parse an expression. |
| 639 | */ |
| 640 | protected Expression parseExpression() throws SyntaxError, IOException { |
| 641 | for (Expression e = parseTerm() ; e != null ; e = e.order()) { |
| 642 | Expression more = parseBinaryExpression(e); |
| 643 | if (more == null) |
| 644 | return e; |
| 645 | e = more; |
| 646 | } |
| 647 | // this return is bogus |
| 648 | return null; |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * Given a left-hand term, parse an operator and right-hand term. |
| 653 | */ |
| 654 | protected Expression parseBinaryExpression(Expression e) throws SyntaxError, IOException { |
| 655 | if (e != null) { |
| 656 | switch (token) { |
| 657 | case LSQBRACKET: { |
| 658 | // index: expr1[expr2] |
| 659 | long p = scan(); |
| 660 | Expression index = (token != RSQBRACKET) ? parseExpression() : null; |
| 661 | expect(RSQBRACKET); |
| 662 | e = new ArrayAccessExpression(p, e, index); |
| 663 | break; |
| 664 | } |
| 665 | |
| 666 | case INC: |
| 667 | e = new PostIncExpression(scan(), e); |
| 668 | break; |
| 669 | case DEC: |
| 670 | e = new PostDecExpression(scan(), e); |
| 671 | break; |
| 672 | case FIELD: { |
| 673 | long p = scan(); |
| 674 | if (token == THIS) { |
| 675 | // class C { class N { ... C.this ... } } |
| 676 | // class C { class N { N(C c){ ... c.this() ... } } } |
| 677 | long q = scan(); |
| 678 | if (token == LPAREN) { |
| 679 | e = new ThisExpression(q, e); |
| 680 | e = parseMethodExpression(e, idInit); |
| 681 | } else { |
| 682 | e = new FieldExpression(p, e, idThis); |
| 683 | } |
| 684 | break; |
| 685 | } |
| 686 | if (token == SUPER) { |
| 687 | // class D extends C.N { D(C.N n) { n.super(); } } |
| 688 | // Also, 'C.super', as in: |
| 689 | // class C extends CS { class N { ... C.super.foo ... } } |
| 690 | // class C extends CS { class N { ... C.super.foo() ... } } |
| 691 | long q = scan(); |
| 692 | if (token == LPAREN) { |
| 693 | e = new SuperExpression(q, e); |
| 694 | e = parseMethodExpression(e, idInit); |
| 695 | } else { |
| 696 | // We must check elsewhere that this expression |
| 697 | // does not stand alone, but qualifies a member name. |
| 698 | e = new FieldExpression(p, e, idSuper); |
| 699 | } |
| 700 | break; |
| 701 | } |
| 702 | if (token == NEW) { |
| 703 | // new C().new N() |
| 704 | scan(); |
| 705 | if (token != IDENT) |
| 706 | expect(IDENT); |
| 707 | e = parseNewInstanceExpression(p, e, parseTypeExpression()); |
| 708 | break; |
| 709 | } |
| 710 | if (token == CLASS) { |
| 711 | // just class literals, really |
| 712 | // Class c = C.class; |
| 713 | scan(); |
| 714 | e = new FieldExpression(p, e, idClass); |
| 715 | break; |
| 716 | } |
| 717 | Identifier id = scanner.idValue; |
| 718 | expect(IDENT); |
| 719 | if (token == LPAREN) { |
| 720 | e = parseMethodExpression(e, id); |
| 721 | } else { |
| 722 | e = new FieldExpression(p, e, id); |
| 723 | } |
| 724 | break; |
| 725 | } |
| 726 | case INSTANCEOF: |
| 727 | e = new InstanceOfExpression(scan(), e, parseTerm()); |
| 728 | break; |
| 729 | case ADD: |
| 730 | e = new AddExpression(scan(), e, parseTerm()); |
| 731 | break; |
| 732 | case SUB: |
| 733 | e = new SubtractExpression(scan(), e, parseTerm()); |
| 734 | break; |
| 735 | case MUL: |
| 736 | e = new MultiplyExpression(scan(), e, parseTerm()); |
| 737 | break; |
| 738 | case DIV: |
| 739 | e = new DivideExpression(scan(), e, parseTerm()); |
| 740 | break; |
| 741 | case REM: |
| 742 | e = new RemainderExpression(scan(), e, parseTerm()); |
| 743 | break; |
| 744 | case LSHIFT: |
| 745 | e = new ShiftLeftExpression(scan(), e, parseTerm()); |
| 746 | break; |
| 747 | case RSHIFT: |
| 748 | e = new ShiftRightExpression(scan(), e, parseTerm()); |
| 749 | break; |
| 750 | case URSHIFT: |
| 751 | e = new UnsignedShiftRightExpression(scan(), e, parseTerm()); |
| 752 | break; |
| 753 | case LT: |
| 754 | e = new LessExpression(scan(), e, parseTerm()); |
| 755 | break; |
| 756 | case LE: |
| 757 | e = new LessOrEqualExpression(scan(), e, parseTerm()); |
| 758 | break; |
| 759 | case GT: |
| 760 | e = new GreaterExpression(scan(), e, parseTerm()); |
| 761 | break; |
| 762 | case GE: |
| 763 | e = new GreaterOrEqualExpression(scan(), e, parseTerm()); |
| 764 | break; |
| 765 | case EQ: |
| 766 | e = new EqualExpression(scan(), e, parseTerm()); |
| 767 | break; |
| 768 | case NE: |
| 769 | e = new NotEqualExpression(scan(), e, parseTerm()); |
| 770 | break; |
| 771 | case BITAND: |
| 772 | e = new BitAndExpression(scan(), e, parseTerm()); |
| 773 | break; |
| 774 | case BITXOR: |
| 775 | e = new BitXorExpression(scan(), e, parseTerm()); |
| 776 | break; |
| 777 | case BITOR: |
| 778 | e = new BitOrExpression(scan(), e, parseTerm()); |
| 779 | break; |
| 780 | case AND: |
| 781 | e = new AndExpression(scan(), e, parseTerm()); |
| 782 | break; |
| 783 | case OR: |
| 784 | e = new OrExpression(scan(), e, parseTerm()); |
| 785 | break; |
| 786 | case ASSIGN: |
| 787 | e = new AssignExpression(scan(), e, parseTerm()); |
| 788 | break; |
| 789 | case ASGMUL: |
| 790 | e = new AssignMultiplyExpression(scan(), e, parseTerm()); |
| 791 | break; |
| 792 | case ASGDIV: |
| 793 | e = new AssignDivideExpression(scan(), e, parseTerm()); |
| 794 | break; |
| 795 | case ASGREM: |
| 796 | e = new AssignRemainderExpression(scan(), e, parseTerm()); |
| 797 | break; |
| 798 | case ASGADD: |
| 799 | e = new AssignAddExpression(scan(), e, parseTerm()); |
| 800 | break; |
| 801 | case ASGSUB: |
| 802 | e = new AssignSubtractExpression(scan(), e, parseTerm()); |
| 803 | break; |
| 804 | case ASGLSHIFT: |
| 805 | e = new AssignShiftLeftExpression(scan(), e, parseTerm()); |
| 806 | break; |
| 807 | case ASGRSHIFT: |
| 808 | e = new AssignShiftRightExpression(scan(), e, parseTerm()); |
| 809 | break; |
| 810 | case ASGURSHIFT: |
| 811 | e = new AssignUnsignedShiftRightExpression(scan(), e, parseTerm()); |
| 812 | break; |
| 813 | case ASGBITAND: |
| 814 | e = new AssignBitAndExpression(scan(), e, parseTerm()); |
| 815 | break; |
| 816 | case ASGBITOR: |
| 817 | e = new AssignBitOrExpression(scan(), e, parseTerm()); |
| 818 | break; |
| 819 | case ASGBITXOR: |
| 820 | e = new AssignBitXorExpression(scan(), e, parseTerm()); |
| 821 | break; |
| 822 | case QUESTIONMARK: { |
| 823 | long p = scan(); |
| 824 | Expression second = parseExpression(); |
| 825 | expect(COLON); |
| 826 | Expression third = parseExpression(); |
| 827 | |
| 828 | // The grammar in the JLS does not allow assignment |
| 829 | // expressions as the third part of a ?: expression. |
| 830 | // Even though javac has no trouble parsing this, |
| 831 | // check for this case and signal an error. |
| 832 | // (fix for bug 4092958) |
| 833 | if (third instanceof AssignExpression |
| 834 | || third instanceof AssignOpExpression) { |
| 835 | env.error(third.getWhere(), "assign.in.conditionalexpr"); |
| 836 | } |
| 837 | |
| 838 | e = new ConditionalExpression(p, e, second, third); |
| 839 | break; |
| 840 | } |
| 841 | |
| 842 | default: |
| 843 | return null; // mark end of binary expressions |
| 844 | } |
| 845 | } |
| 846 | return e; // return more binary expression stuff |
| 847 | } |
| 848 | |
| 849 | /** |
| 850 | * Recover after a syntax error in a statement. This involves |
| 851 | * discarding tokens until EOF or a possible continuation is |
| 852 | * encountered. |
| 853 | */ |
| 854 | protected boolean recoverStatement() throws SyntaxError, IOException { |
| 855 | while (true) { |
| 856 | switch (token) { |
| 857 | case EOF: |
| 858 | case RBRACE: |
| 859 | case LBRACE: |
| 860 | case IF: |
| 861 | case FOR: |
| 862 | case WHILE: |
| 863 | case DO: |
| 864 | case TRY: |
| 865 | case CATCH: |
| 866 | case FINALLY: |
| 867 | case BREAK: |
| 868 | case CONTINUE: |
| 869 | case RETURN: |
| 870 | // begin of a statement, return |
| 871 | return true; |
| 872 | |
| 873 | case VOID: |
| 874 | case STATIC: |
| 875 | case PUBLIC: |
| 876 | case PRIVATE: |
| 877 | case SYNCHRONIZED: |
| 878 | case INTERFACE: |
| 879 | case CLASS: |
| 880 | case TRANSIENT: |
| 881 | // begin of something outside a statement, panic some more |
| 882 | expect(RBRACE); |
| 883 | return false; |
| 884 | |
| 885 | case LPAREN: |
| 886 | match(LPAREN, RPAREN); |
| 887 | scan(); |
| 888 | break; |
| 889 | |
| 890 | case LSQBRACKET: |
| 891 | match(LSQBRACKET, RSQBRACKET); |
| 892 | scan(); |
| 893 | break; |
| 894 | |
| 895 | default: |
| 896 | // don't know what to do, skip |
| 897 | scan(); |
| 898 | break; |
| 899 | } |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | /** |
| 904 | * Parse declaration, called after the type expression |
| 905 | * has been parsed and the current token is IDENT. |
| 906 | */ |
| 907 | protected Statement parseDeclaration(long p, int mod, Expression type) throws SyntaxError, IOException { |
| 908 | int i = argIndex; |
| 909 | if (token == IDENT) { |
| 910 | addArgument(new VarDeclarationStatement(pos, parseExpression())); |
| 911 | while (token == COMMA) { |
| 912 | scan(); |
| 913 | addArgument(new VarDeclarationStatement(pos, parseExpression())); |
| 914 | } |
| 915 | } |
| 916 | return new DeclarationStatement(p, mod, type, statArgs(i)); |
| 917 | } |
| 918 | |
| 919 | /** |
| 920 | * Check if an expression is a legal toplevel expression. |
| 921 | * Only method, inc, dec, and new expression are allowed. |
| 922 | */ |
| 923 | protected void topLevelExpression(Expression e) { |
| 924 | switch (e.getOp()) { |
| 925 | case ASSIGN: |
| 926 | case ASGMUL: |
| 927 | case ASGDIV: |
| 928 | case ASGREM: |
| 929 | case ASGADD: |
| 930 | case ASGSUB: |
| 931 | case ASGLSHIFT: |
| 932 | case ASGRSHIFT: |
| 933 | case ASGURSHIFT: |
| 934 | case ASGBITAND: |
| 935 | case ASGBITOR: |
| 936 | case ASGBITXOR: |
| 937 | case PREINC: |
| 938 | case PREDEC: |
| 939 | case POSTINC: |
| 940 | case POSTDEC: |
| 941 | case METHOD: |
| 942 | case NEWINSTANCE: |
| 943 | return; |
| 944 | } |
| 945 | env.error(e.getWhere(), "invalid.expr"); |
| 946 | } |
| 947 | |
| 948 | /** |
| 949 | * Parse a statement. |
| 950 | */ |
| 951 | protected Statement parseStatement() throws SyntaxError, IOException { |
| 952 | switch (token) { |
| 953 | case SEMICOLON: |
| 954 | return new CompoundStatement(scan(), new Statement[0]); |
| 955 | |
| 956 | case LBRACE: |
| 957 | return parseBlockStatement(); |
| 958 | |
| 959 | case IF: { |
| 960 | // if-statement: if (expr) stat |
| 961 | // if-statement: if (expr) stat else stat |
| 962 | long p = scan(); |
| 963 | |
| 964 | expect(LPAREN); |
| 965 | Expression c = parseExpression(); |
| 966 | expect(RPAREN); |
| 967 | Statement t = parseStatement(); |
| 968 | if (token == ELSE) { |
| 969 | scan(); |
| 970 | return new IfStatement(p, c, t, parseStatement()); |
| 971 | } else { |
| 972 | return new IfStatement(p, c, t, null); |
| 973 | } |
| 974 | } |
| 975 | |
| 976 | case ELSE: { |
| 977 | // else-statement: else stat |
| 978 | env.error(scan(), "else.without.if"); |
| 979 | return parseStatement(); |
| 980 | } |
| 981 | |
| 982 | case FOR: { |
| 983 | // for-statement: for (decl-expr? ; expr? ; expr?) stat |
| 984 | long p = scan(); |
| 985 | Statement init = null; |
| 986 | Expression cond = null, inc = null; |
| 987 | |
| 988 | expect(LPAREN); |
| 989 | if (token != SEMICOLON) { |
| 990 | long p2 = pos; |
| 991 | int mod = parseModifiers(M_FINAL); |
| 992 | Expression e = parseExpression(); |
| 993 | |
| 994 | if (token == IDENT) { |
| 995 | init = parseDeclaration(p2, mod, e); |
| 996 | } else { |
| 997 | if (mod != 0) { |
| 998 | expect(IDENT); // should have been a declaration |
| 999 | } |
| 1000 | topLevelExpression(e); |
| 1001 | while (token == COMMA) { |
| 1002 | long p3 = scan(); |
| 1003 | Expression e2 = parseExpression(); |
| 1004 | topLevelExpression(e2); |
| 1005 | e = new CommaExpression(p3, e, e2); |
| 1006 | } |
| 1007 | init = new ExpressionStatement(p2, e); |
| 1008 | } |
| 1009 | } |
| 1010 | expect(SEMICOLON); |
| 1011 | if (token != SEMICOLON) { |
| 1012 | cond = parseExpression(); |
| 1013 | } |
| 1014 | expect(SEMICOLON); |
| 1015 | if (token != RPAREN) { |
| 1016 | inc = parseExpression(); |
| 1017 | topLevelExpression(inc); |
| 1018 | while (token == COMMA) { |
| 1019 | long p2 = scan(); |
| 1020 | Expression e2 = parseExpression(); |
| 1021 | topLevelExpression(e2); |
| 1022 | inc = new CommaExpression(p2, inc, e2); |
| 1023 | } |
| 1024 | } |
| 1025 | expect(RPAREN); |
| 1026 | return new ForStatement(p, init, cond, inc, parseStatement()); |
| 1027 | } |
| 1028 | |
| 1029 | case WHILE: { |
| 1030 | // while-statement: while (expr) stat |
| 1031 | long p = scan(); |
| 1032 | |
| 1033 | expect(LPAREN); |
| 1034 | Expression cond = parseExpression(); |
| 1035 | expect(RPAREN); |
| 1036 | return new WhileStatement(p, cond, parseStatement()); |
| 1037 | } |
| 1038 | |
| 1039 | case DO: { |
| 1040 | // do-statement: do stat while (expr) |
| 1041 | long p = scan(); |
| 1042 | |
| 1043 | Statement body = parseStatement(); |
| 1044 | expect(WHILE); |
| 1045 | expect(LPAREN); |
| 1046 | Expression cond = parseExpression(); |
| 1047 | expect(RPAREN); |
| 1048 | expect(SEMICOLON); |
| 1049 | return new DoStatement(p, body, cond); |
| 1050 | } |
| 1051 | |
| 1052 | case BREAK: { |
| 1053 | // break-statement: break ; |
| 1054 | long p = scan(); |
| 1055 | Identifier label = null; |
| 1056 | |
| 1057 | if (token == IDENT) { |
| 1058 | label = scanner.idValue; |
| 1059 | scan(); |
| 1060 | } |
| 1061 | expect(SEMICOLON); |
| 1062 | return new BreakStatement(p, label); |
| 1063 | } |
| 1064 | |
| 1065 | case CONTINUE: { |
| 1066 | // continue-statement: continue ; |
| 1067 | long p = scan(); |
| 1068 | Identifier label = null; |
| 1069 | |
| 1070 | if (token == IDENT) { |
| 1071 | label = scanner.idValue; |
| 1072 | scan(); |
| 1073 | } |
| 1074 | expect(SEMICOLON); |
| 1075 | return new ContinueStatement(p, label); |
| 1076 | } |
| 1077 | |
| 1078 | case RETURN: { |
| 1079 | // return-statement: return ; |
| 1080 | // return-statement: return expr ; |
| 1081 | long p = scan(); |
| 1082 | Expression e = null; |
| 1083 | |
| 1084 | if (token != SEMICOLON) { |
| 1085 | e = parseExpression(); |
| 1086 | } |
| 1087 | expect(SEMICOLON); |
| 1088 | return new ReturnStatement(p, e); |
| 1089 | } |
| 1090 | |
| 1091 | case SWITCH: { |
| 1092 | // switch statement: switch ( expr ) stat |
| 1093 | long p = scan(); |
| 1094 | int i = argIndex; |
| 1095 | |
| 1096 | expect(LPAREN); |
| 1097 | Expression e = parseExpression(); |
| 1098 | expect(RPAREN); |
| 1099 | expect(LBRACE); |
| 1100 | |
| 1101 | while ((token != EOF) && (token != RBRACE)) { |
| 1102 | int j = argIndex; |
| 1103 | try { |
| 1104 | switch (token) { |
| 1105 | case CASE: |
| 1106 | // case-statement: case expr: |
| 1107 | addArgument(new CaseStatement(scan(), parseExpression())); |
| 1108 | expect(COLON); |
| 1109 | break; |
| 1110 | |
| 1111 | case DEFAULT: |
| 1112 | // default-statement: default: |
| 1113 | addArgument(new CaseStatement(scan(), null)); |
| 1114 | expect(COLON); |
| 1115 | break; |
| 1116 | |
| 1117 | default: |
| 1118 | addArgument(parseStatement()); |
| 1119 | break; |
| 1120 | } |
| 1121 | } catch (SyntaxError ee) { |
| 1122 | argIndex = j; |
| 1123 | if (!recoverStatement()) { |
| 1124 | throw ee; |
| 1125 | } |
| 1126 | } |
| 1127 | } |
| 1128 | expect(RBRACE); |
| 1129 | return new SwitchStatement(p, e, statArgs(i)); |
| 1130 | } |
| 1131 | |
| 1132 | case CASE: { |
| 1133 | // case-statement: case expr : stat |
| 1134 | env.error(pos, "case.without.switch"); |
| 1135 | while (token == CASE) { |
| 1136 | scan(); |
| 1137 | parseExpression(); |
| 1138 | expect(COLON); |
| 1139 | } |
| 1140 | return parseStatement(); |
| 1141 | } |
| 1142 | |
| 1143 | case DEFAULT: { |
| 1144 | // default-statement: default : stat |
| 1145 | env.error(pos, "default.without.switch"); |
| 1146 | scan(); |
| 1147 | expect(COLON); |
| 1148 | return parseStatement(); |
| 1149 | } |
| 1150 | |
| 1151 | case TRY: { |
| 1152 | // try-statement: try stat catch (type-expr ident) stat finally stat |
| 1153 | long p = scan(); |
| 1154 | Statement init = null; // try-object specification |
| 1155 | int i = argIndex; |
| 1156 | boolean catches = false; |
| 1157 | |
| 1158 | if (false && token == LPAREN) { |
| 1159 | expect(LPAREN); |
| 1160 | long p2 = pos; |
| 1161 | int mod = parseModifiers(M_FINAL); |
| 1162 | Expression e = parseExpression(); |
| 1163 | |
| 1164 | if (token == IDENT) { |
| 1165 | init = parseDeclaration(p2, mod, e); |
| 1166 | // leave check for try (T x, y) for semantic phase |
| 1167 | } else { |
| 1168 | if (mod != 0) { |
| 1169 | expect(IDENT); // should have been a declaration |
| 1170 | } |
| 1171 | init = new ExpressionStatement(p2, e); |
| 1172 | } |
| 1173 | expect(RPAREN); |
| 1174 | } |
| 1175 | |
| 1176 | Statement s = parseBlockStatement(); |
| 1177 | |
| 1178 | if (init != null) { |
| 1179 | // s = new FinallyStatement(p, init, s, 0); |
| 1180 | } |
| 1181 | |
| 1182 | while (token == CATCH) { |
| 1183 | long pp = pos; |
| 1184 | expect(CATCH); |
| 1185 | expect(LPAREN); |
| 1186 | int mod = parseModifiers(M_FINAL); |
| 1187 | Expression t = parseExpression(); |
| 1188 | IdentifierToken id = scanner.getIdToken(); |
| 1189 | expect(IDENT); |
| 1190 | id.modifiers = mod; |
| 1191 | // We only catch Throwable's, so this is no longer required |
| 1192 | // while (token == LSQBRACKET) { |
| 1193 | // t = new ArrayAccessExpression(scan(), t, null); |
| 1194 | // expect(RSQBRACKET); |
| 1195 | // } |
| 1196 | expect(RPAREN); |
| 1197 | addArgument(new CatchStatement(pp, t, id, parseBlockStatement())); |
| 1198 | catches = true; |
| 1199 | } |
| 1200 | |
| 1201 | if (catches) |
| 1202 | s = new TryStatement(p, s, statArgs(i)); |
| 1203 | |
| 1204 | if (token == FINALLY) { |
| 1205 | scan(); |
| 1206 | return new FinallyStatement(p, s, parseBlockStatement()); |
| 1207 | } else if (catches || init != null) { |
| 1208 | return s; |
| 1209 | } else { |
| 1210 | env.error(pos, "try.without.catch.finally"); |
| 1211 | return new TryStatement(p, s, null); |
| 1212 | } |
| 1213 | } |
| 1214 | |
| 1215 | case CATCH: { |
| 1216 | // catch-statement: catch (expr ident) stat finally stat |
| 1217 | env.error(pos, "catch.without.try"); |
| 1218 | |
| 1219 | Statement s; |
| 1220 | do { |
| 1221 | scan(); |
| 1222 | expect(LPAREN); |
| 1223 | parseModifiers(M_FINAL); |
| 1224 | parseExpression(); |
| 1225 | expect(IDENT); |
| 1226 | expect(RPAREN); |
| 1227 | s = parseBlockStatement(); |
| 1228 | } while (token == CATCH); |
| 1229 | |
| 1230 | if (token == FINALLY) { |
| 1231 | scan(); |
| 1232 | s = parseBlockStatement(); |
| 1233 | } |
| 1234 | return s; |
| 1235 | } |
| 1236 | |
| 1237 | case FINALLY: { |
| 1238 | // finally-statement: finally stat |
| 1239 | env.error(pos, "finally.without.try"); |
| 1240 | scan(); |
| 1241 | return parseBlockStatement(); |
| 1242 | } |
| 1243 | |
| 1244 | case THROW: { |
| 1245 | // throw-statement: throw expr; |
| 1246 | long p = scan(); |
| 1247 | Expression e = parseExpression(); |
| 1248 | expect(SEMICOLON); |
| 1249 | return new ThrowStatement(p, e); |
| 1250 | } |
| 1251 | |
| 1252 | case GOTO: { |
| 1253 | long p = scan(); |
| 1254 | expect(IDENT); |
| 1255 | expect(SEMICOLON); |
| 1256 | env.error(p, "not.supported", "goto"); |
| 1257 | return new CompoundStatement(p, new Statement[0]); |
| 1258 | } |
| 1259 | |
| 1260 | case SYNCHRONIZED: { |
| 1261 | // synchronized-statement: synchronized (expr) stat |
| 1262 | long p = scan(); |
| 1263 | expect(LPAREN); |
| 1264 | Expression e = parseExpression(); |
| 1265 | expect(RPAREN); |
| 1266 | return new SynchronizedStatement(p, e, parseBlockStatement()); |
| 1267 | } |
| 1268 | |
| 1269 | case INTERFACE: |
| 1270 | case CLASS: |
| 1271 | // Inner class. |
| 1272 | return parseLocalClass(0); |
| 1273 | |
| 1274 | case CONST: |
| 1275 | case ABSTRACT: |
| 1276 | case FINAL: |
| 1277 | case STRICTFP: { |
| 1278 | // a declaration of some sort |
| 1279 | long p = pos; |
| 1280 | |
| 1281 | // A class which is local to a block is not a member, and so |
| 1282 | // cannot be public, private, protected, or static. It is in |
| 1283 | // effect private to the block, since it cannot be used outside |
| 1284 | // its scope. |
| 1285 | // |
| 1286 | // However, any class (if it has a name) can be declared final, |
| 1287 | // abstract, or strictfp. |
| 1288 | int mod = parseModifiers(M_FINAL | M_ABSTRACT |
| 1289 | | M_STRICTFP ); |
| 1290 | |
| 1291 | switch (token) { |
| 1292 | case INTERFACE: |
| 1293 | case CLASS: |
| 1294 | return parseLocalClass(mod); |
| 1295 | |
| 1296 | case BOOLEAN: |
| 1297 | case BYTE: |
| 1298 | case CHAR: |
| 1299 | case SHORT: |
| 1300 | case INT: |
| 1301 | case LONG: |
| 1302 | case FLOAT: |
| 1303 | case DOUBLE: |
| 1304 | case IDENT: { |
| 1305 | if ((mod & (M_ABSTRACT | M_STRICTFP )) != 0) { |
| 1306 | mod &= ~ (M_ABSTRACT | M_STRICTFP ); |
| 1307 | expect(CLASS); |
| 1308 | } |
| 1309 | Expression e = parseExpression(); |
| 1310 | if (token != IDENT) { |
| 1311 | expect(IDENT); |
| 1312 | } |
| 1313 | // declaration: final expr expr |
| 1314 | Statement s = parseDeclaration(p, mod, e); |
| 1315 | expect(SEMICOLON); |
| 1316 | return s; |
| 1317 | } |
| 1318 | |
| 1319 | default: |
| 1320 | env.error(pos, "type.expected"); |
| 1321 | throw new SyntaxError(); |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | case VOID: |
| 1326 | case STATIC: |
| 1327 | case PUBLIC: |
| 1328 | case PRIVATE: |
| 1329 | case TRANSIENT: |
| 1330 | // This is the start of something outside a statement |
| 1331 | env.error(pos, "statement.expected"); |
| 1332 | throw new SyntaxError(); |
| 1333 | } |
| 1334 | |
| 1335 | long p = pos; |
| 1336 | Expression e = parseExpression(); |
| 1337 | |
| 1338 | if (token == IDENT) { |
| 1339 | // declaration: expr expr |
| 1340 | Statement s = parseDeclaration(p, 0, e); |
| 1341 | expect(SEMICOLON); |
| 1342 | return s; |
| 1343 | } |
| 1344 | if (token == COLON) { |
| 1345 | // label: id: stat |
| 1346 | scan(); |
| 1347 | Statement s = parseStatement(); |
| 1348 | s.setLabel(env, e); |
| 1349 | return s; |
| 1350 | } |
| 1351 | |
| 1352 | // it was just an expression... |
| 1353 | topLevelExpression(e); |
| 1354 | expect(SEMICOLON); |
| 1355 | return new ExpressionStatement(p, e); |
| 1356 | } |
| 1357 | |
| 1358 | protected Statement parseBlockStatement() throws SyntaxError, IOException { |
| 1359 | // compound statement: { stat1 stat2 ... statn } |
| 1360 | if (token != LBRACE) { |
| 1361 | // We're expecting a block statement. But we'll probably do the |
| 1362 | // least damage if we try to parse a normal statement instead. |
| 1363 | env.error(scanner.prevPos, "token.expected", opNames[LBRACE]); |
| 1364 | return parseStatement(); |
| 1365 | } |
| 1366 | long p = scan(); |
| 1367 | int i = argIndex; |
| 1368 | while ((token != EOF) && (token != RBRACE)) { |
| 1369 | int j = argIndex; |
| 1370 | try { |
| 1371 | addArgument(parseStatement()); |
| 1372 | } catch (SyntaxError e) { |
| 1373 | argIndex = j; |
| 1374 | if (!recoverStatement()) { |
| 1375 | throw e; |
| 1376 | } |
| 1377 | } |
| 1378 | } |
| 1379 | |
| 1380 | expect(RBRACE); |
| 1381 | return new CompoundStatement(p, statArgs(i)); |
| 1382 | } |
| 1383 | |
| 1384 | |
| 1385 | /** |
| 1386 | * Parse an identifier. ie: a.b.c returns "a.b.c" |
| 1387 | * If star is true then "a.b.*" is allowed. |
| 1388 | * The return value encodes both the identifier and its location. |
| 1389 | */ |
| 1390 | protected IdentifierToken parseName(boolean star) throws SyntaxError, IOException { |
| 1391 | IdentifierToken res = scanner.getIdToken(); |
| 1392 | expect(IDENT); |
| 1393 | |
| 1394 | if (token != FIELD) { |
| 1395 | return res; |
| 1396 | } |
| 1397 | |
| 1398 | StringBuffer buf = new StringBuffer(res.id.toString()); |
| 1399 | |
| 1400 | while (token == FIELD) { |
| 1401 | scan(); |
| 1402 | if ((token == MUL) && star) { |
| 1403 | scan(); |
| 1404 | buf.append(".*"); |
| 1405 | break; |
| 1406 | } |
| 1407 | |
| 1408 | buf.append('.'); |
| 1409 | if (token == IDENT) { |
| 1410 | buf.append(scanner.idValue); |
| 1411 | } |
| 1412 | expect(IDENT); |
| 1413 | } |
| 1414 | |
| 1415 | res.id = Identifier.lookup(buf.toString()); |
| 1416 | return res; |
| 1417 | } |
| 1418 | /** |
| 1419 | * @deprecated |
| 1420 | * @see #parseName |
| 1421 | */ |
| 1422 | @Deprecated |
| 1423 | protected Identifier parseIdentifier(boolean star) throws SyntaxError, IOException { |
| 1424 | return parseName(star).id; |
| 1425 | } |
| 1426 | |
| 1427 | /** |
| 1428 | * Parse a type expression, this results in a Type. |
| 1429 | * The parse includes trailing array brackets. |
| 1430 | */ |
| 1431 | protected Type parseType() throws SyntaxError, IOException { |
| 1432 | Type t; |
| 1433 | |
| 1434 | switch (token) { |
| 1435 | case IDENT: |
| 1436 | t = Type.tClass(parseName(false).id); |
| 1437 | break; |
| 1438 | case VOID: |
| 1439 | scan(); |
| 1440 | t = Type.tVoid; |
| 1441 | break; |
| 1442 | case BOOLEAN: |
| 1443 | scan(); |
| 1444 | t = Type.tBoolean; |
| 1445 | break; |
| 1446 | case BYTE: |
| 1447 | scan(); |
| 1448 | t = Type.tByte; |
| 1449 | break; |
| 1450 | case CHAR: |
| 1451 | scan(); |
| 1452 | t = Type.tChar; |
| 1453 | break; |
| 1454 | case SHORT: |
| 1455 | scan(); |
| 1456 | t = Type.tShort; |
| 1457 | break; |
| 1458 | case INT: |
| 1459 | scan(); |
| 1460 | t = Type.tInt; |
| 1461 | break; |
| 1462 | case FLOAT: |
| 1463 | scan(); |
| 1464 | t = Type.tFloat; |
| 1465 | break; |
| 1466 | case LONG: |
| 1467 | scan(); |
| 1468 | t = Type.tLong; |
| 1469 | break; |
| 1470 | case DOUBLE: |
| 1471 | scan(); |
| 1472 | t = Type.tDouble; |
| 1473 | break; |
| 1474 | default: |
| 1475 | env.error(pos, "type.expected"); |
| 1476 | throw new SyntaxError(); |
| 1477 | } |
| 1478 | return parseArrayBrackets(t); |
| 1479 | } |
| 1480 | |
| 1481 | /** |
| 1482 | * Parse the tail of a type expression, which might be array brackets. |
| 1483 | * Return the given type, as possibly modified by the suffix. |
| 1484 | */ |
| 1485 | protected Type parseArrayBrackets(Type t) throws SyntaxError, IOException { |
| 1486 | |
| 1487 | // Parse []'s |
| 1488 | while (token == LSQBRACKET) { |
| 1489 | scan(); |
| 1490 | if (token != RSQBRACKET) { |
| 1491 | env.error(pos, "array.dim.in.decl"); |
| 1492 | parseExpression(); |
| 1493 | } |
| 1494 | expect(RSQBRACKET); |
| 1495 | t = Type.tArray(t); |
| 1496 | } |
| 1497 | return t; |
| 1498 | } |
| 1499 | |
| 1500 | /* |
| 1501 | * Dealing with argument lists, I'm not using |
| 1502 | * Vector for efficiency. |
| 1503 | */ |
| 1504 | |
| 1505 | private int aCount = 0; |
| 1506 | private Type aTypes[] = new Type[8]; |
| 1507 | private IdentifierToken aNames[] = new IdentifierToken[aTypes.length]; |
| 1508 | |
| 1509 | private void addArgument(int mod, Type t, IdentifierToken nm) { |
| 1510 | nm.modifiers = mod; |
| 1511 | if (aCount >= aTypes.length) { |
| 1512 | Type newATypes[] = new Type[aCount * 2]; |
| 1513 | System.arraycopy(aTypes, 0, newATypes, 0, aCount); |
| 1514 | aTypes = newATypes; |
| 1515 | IdentifierToken newANames[] = new IdentifierToken[aCount * 2]; |
| 1516 | System.arraycopy(aNames, 0, newANames, 0, aCount); |
| 1517 | aNames = newANames; |
| 1518 | } |
| 1519 | aTypes[aCount] = t; |
| 1520 | aNames[aCount++] = nm; |
| 1521 | } |
| 1522 | |
| 1523 | /** |
| 1524 | * Parse a possibly-empty sequence of modifier keywords. |
| 1525 | * Return the resulting bitmask. |
| 1526 | * Diagnose repeated modifiers, but make no other checks. |
| 1527 | * Only modifiers mentioned in the given bitmask are scanned; |
| 1528 | * an unmatched modifier must be handled by the caller. |
| 1529 | */ |
| 1530 | protected int parseModifiers(int mask) throws IOException { |
| 1531 | int mod = 0; |
| 1532 | while (true) { |
| 1533 | if (token==CONST) { |
| 1534 | // const isn't in java, but handle a common C++ usage gently |
| 1535 | env.error(pos, "not.supported", "const"); |
| 1536 | scan(); |
| 1537 | } |
| 1538 | int nextmod = 0; |
| 1539 | switch (token) { |
| 1540 | case PRIVATE: nextmod = M_PRIVATE; break; |
| 1541 | case PUBLIC: nextmod = M_PUBLIC; break; |
| 1542 | case PROTECTED: nextmod = M_PROTECTED; break; |
| 1543 | case STATIC: nextmod = M_STATIC; break; |
| 1544 | case TRANSIENT: nextmod = M_TRANSIENT; break; |
| 1545 | case FINAL: nextmod = M_FINAL; break; |
| 1546 | case ABSTRACT: nextmod = M_ABSTRACT; break; |
| 1547 | case NATIVE: nextmod = M_NATIVE; break; |
| 1548 | case VOLATILE: nextmod = M_VOLATILE; break; |
| 1549 | case SYNCHRONIZED: nextmod = M_SYNCHRONIZED; break; |
| 1550 | case STRICTFP: nextmod = M_STRICTFP; break; |
| 1551 | } |
| 1552 | if ((nextmod & mask) == 0) { |
| 1553 | break; |
| 1554 | } |
| 1555 | if ((nextmod & mod) != 0) { |
| 1556 | env.error(pos, "repeated.modifier"); |
| 1557 | } |
| 1558 | mod |= nextmod; |
| 1559 | scan(); |
| 1560 | } |
| 1561 | return mod; |
| 1562 | } |
| 1563 | |
| 1564 | private ClassDefinition curClass; |
| 1565 | |
| 1566 | /** |
| 1567 | * Parse a field. |
| 1568 | */ |
| 1569 | protected void parseField() throws SyntaxError, IOException { |
| 1570 | |
| 1571 | // Empty fields are not allowed by the JLS but are accepted by |
| 1572 | // the compiler, and much code has come to rely on this. It has |
| 1573 | // been decided that the language will be extended to legitimize them. |
| 1574 | if (token == SEMICOLON) { |
| 1575 | // empty field |
| 1576 | scan(); |
| 1577 | return; |
| 1578 | } |
| 1579 | |
| 1580 | // Optional doc comment |
| 1581 | String doc = scanner.docComment; |
| 1582 | |
| 1583 | // The start of the field |
| 1584 | long p = pos; |
| 1585 | |
| 1586 | // Parse the modifiers |
| 1587 | int mod = parseModifiers(MM_FIELD | MM_METHOD); |
| 1588 | |
| 1589 | // Check for static initializer |
| 1590 | // ie: static { ... } |
| 1591 | // or an instance initializer (w/o the static). |
| 1592 | if ((mod == (mod & M_STATIC)) && (token == LBRACE)) { |
| 1593 | // static initializer |
| 1594 | actions.defineField(p, curClass, doc, mod, |
| 1595 | Type.tMethod(Type.tVoid), |
| 1596 | new IdentifierToken(idClassInit), null, null, |
| 1597 | parseStatement()); |
| 1598 | return; |
| 1599 | } |
| 1600 | |
| 1601 | // Check for inner class |
| 1602 | if (token == CLASS || token == INTERFACE) { |
| 1603 | parseNamedClass(mod, CLASS, doc); |
| 1604 | return; |
| 1605 | } |
| 1606 | |
| 1607 | // Parse the type |
| 1608 | p = pos; |
| 1609 | Type t = parseType(); |
| 1610 | IdentifierToken id = null; |
| 1611 | |
| 1612 | // Check that the type is followed by an Identifier |
| 1613 | // (the name of the method or the first variable), |
| 1614 | // otherwise it is a constructor. |
| 1615 | switch (token) { |
| 1616 | case IDENT: |
| 1617 | id = scanner.getIdToken(); |
| 1618 | p = scan(); |
| 1619 | break; |
| 1620 | |
| 1621 | case LPAREN: |
| 1622 | // It is a constructor |
| 1623 | id = new IdentifierToken(idInit); |
| 1624 | if ((mod & M_STRICTFP) != 0) |
| 1625 | env.error(pos, "bad.constructor.modifier"); |
| 1626 | break; |
| 1627 | |
| 1628 | default: |
| 1629 | expect(IDENT); |
| 1630 | } |
| 1631 | |
| 1632 | // If the next token is a left-bracket then we |
| 1633 | // are dealing with a method or constructor, otherwise it is |
| 1634 | // a list of variables |
| 1635 | if (token == LPAREN) { |
| 1636 | // It is a method or constructor declaration |
| 1637 | scan(); |
| 1638 | aCount = 0; |
| 1639 | |
| 1640 | if (token != RPAREN) { |
| 1641 | // Parse argument type and identifier |
| 1642 | // (arguments (like locals) are allowed to be final) |
| 1643 | int am = parseModifiers(M_FINAL); |
| 1644 | Type at = parseType(); |
| 1645 | IdentifierToken an = scanner.getIdToken(); |
| 1646 | expect(IDENT); |
| 1647 | |
| 1648 | // Parse optional array specifier, ie: a[][] |
| 1649 | at = parseArrayBrackets(at); |
| 1650 | addArgument(am, at, an); |
| 1651 | |
| 1652 | // If the next token is a comma then there are |
| 1653 | // more arguments |
| 1654 | while (token == COMMA) { |
| 1655 | // Parse argument type and identifier |
| 1656 | scan(); |
| 1657 | am = parseModifiers(M_FINAL); |
| 1658 | at = parseType(); |
| 1659 | an = scanner.getIdToken(); |
| 1660 | expect(IDENT); |
| 1661 | |
| 1662 | // Parse optional array specifier, ie: a[][] |
| 1663 | at = parseArrayBrackets(at); |
| 1664 | addArgument(am, at, an); |
| 1665 | } |
| 1666 | } |
| 1667 | expect(RPAREN); |
| 1668 | |
| 1669 | // Parse optional array sepecifier, ie: foo()[][] |
| 1670 | t = parseArrayBrackets(t); |
| 1671 | |
| 1672 | // copy arguments |
| 1673 | Type atypes[] = new Type[aCount]; |
| 1674 | System.arraycopy(aTypes, 0, atypes, 0, aCount); |
| 1675 | |
| 1676 | IdentifierToken anames[] = new IdentifierToken[aCount]; |
| 1677 | System.arraycopy(aNames, 0, anames, 0, aCount); |
| 1678 | |
| 1679 | // Construct the type signature |
| 1680 | t = Type.tMethod(t, atypes); |
| 1681 | |
| 1682 | // Parse and ignore throws clause |
| 1683 | IdentifierToken exp[] = null; |
| 1684 | if (token == THROWS) { |
| 1685 | Vector v = new Vector(); |
| 1686 | scan(); |
| 1687 | v.addElement(parseName(false)); |
| 1688 | while (token == COMMA) { |
| 1689 | scan(); |
| 1690 | v.addElement(parseName(false)); |
| 1691 | } |
| 1692 | |
| 1693 | exp = new IdentifierToken[v.size()]; |
| 1694 | v.copyInto(exp); |
| 1695 | } |
| 1696 | |
| 1697 | // Check if it is a method definition or a method declaration |
| 1698 | // ie: foo() {...} or foo(); |
| 1699 | switch (token) { |
| 1700 | case LBRACE: // It's a method definition |
| 1701 | |
| 1702 | // Set the state of FP strictness for the body of the method |
| 1703 | int oldFPstate = FPstate; |
| 1704 | if ((mod & M_STRICTFP)!=0) { |
| 1705 | FPstate = M_STRICTFP; |
| 1706 | } else { |
| 1707 | mod |= FPstate & M_STRICTFP; |
| 1708 | } |
| 1709 | |
| 1710 | actions.defineField(p, curClass, doc, mod, t, id, |
| 1711 | anames, exp, parseStatement()); |
| 1712 | |
| 1713 | FPstate = oldFPstate; |
| 1714 | |
| 1715 | break; |
| 1716 | |
| 1717 | case SEMICOLON: |
| 1718 | scan(); |
| 1719 | actions.defineField(p, curClass, doc, mod, t, id, |
| 1720 | anames, exp, null); |
| 1721 | break; |
| 1722 | |
| 1723 | default: |
| 1724 | // really expected a statement body here |
| 1725 | if ((mod & (M_NATIVE | M_ABSTRACT)) == 0) { |
| 1726 | expect(LBRACE); |
| 1727 | } else { |
| 1728 | expect(SEMICOLON); |
| 1729 | } |
| 1730 | } |
| 1731 | return; |
| 1732 | } |
| 1733 | |
| 1734 | // It is a list of instance variables |
| 1735 | while (true) { |
| 1736 | p = pos; // get the current position |
| 1737 | // parse the array brackets (if any) |
| 1738 | // ie: var[][][] |
| 1739 | Type vt = parseArrayBrackets(t); |
| 1740 | |
| 1741 | // Parse the optional initializer |
| 1742 | Node init = null; |
| 1743 | if (token == ASSIGN) { |
| 1744 | scan(); |
| 1745 | init = parseExpression(); |
| 1746 | } |
| 1747 | |
| 1748 | // Define the variable |
| 1749 | actions.defineField(p, curClass, doc, mod, vt, id, |
| 1750 | null, null, init); |
| 1751 | |
| 1752 | // If the next token is a comma, then there is more |
| 1753 | if (token != COMMA) { |
| 1754 | expect(SEMICOLON); |
| 1755 | return; |
| 1756 | } |
| 1757 | scan(); |
| 1758 | |
| 1759 | // The next token must be an identifier |
| 1760 | id = scanner.getIdToken(); |
| 1761 | expect(IDENT); |
| 1762 | } |
| 1763 | } |
| 1764 | |
| 1765 | /** |
| 1766 | * Recover after a syntax error in a field. This involves |
| 1767 | * discarding tokens until an EOF or a possible legal |
| 1768 | * continuation is encountered. |
| 1769 | */ |
| 1770 | protected void recoverField(ClassDefinition newClass) throws SyntaxError, IOException { |
| 1771 | while (true) { |
| 1772 | switch (token) { |
| 1773 | case EOF: |
| 1774 | case STATIC: |
| 1775 | case FINAL: |
| 1776 | case PUBLIC: |
| 1777 | case PRIVATE: |
| 1778 | case SYNCHRONIZED: |
| 1779 | case TRANSIENT: |
| 1780 | |
| 1781 | case VOID: |
| 1782 | case BOOLEAN: |
| 1783 | case BYTE: |
| 1784 | case CHAR: |
| 1785 | case SHORT: |
| 1786 | case INT: |
| 1787 | case FLOAT: |
| 1788 | case LONG: |
| 1789 | case DOUBLE: |
| 1790 | // possible begin of a field, continue |
| 1791 | return; |
| 1792 | |
| 1793 | case LBRACE: |
| 1794 | match(LBRACE, RBRACE); |
| 1795 | scan(); |
| 1796 | break; |
| 1797 | |
| 1798 | case LPAREN: |
| 1799 | match(LPAREN, RPAREN); |
| 1800 | scan(); |
| 1801 | break; |
| 1802 | |
| 1803 | case LSQBRACKET: |
| 1804 | match(LSQBRACKET, RSQBRACKET); |
| 1805 | scan(); |
| 1806 | break; |
| 1807 | |
| 1808 | case RBRACE: |
| 1809 | case INTERFACE: |
| 1810 | case CLASS: |
| 1811 | case IMPORT: |
| 1812 | case PACKAGE: |
| 1813 | // begin of something outside a class, panic more |
| 1814 | actions.endClass(pos, newClass); |
| 1815 | throw new SyntaxError(); |
| 1816 | |
| 1817 | default: |
| 1818 | // don't know what to do, skip |
| 1819 | scan(); |
| 1820 | break; |
| 1821 | } |
| 1822 | } |
| 1823 | } |
| 1824 | |
| 1825 | /** |
| 1826 | * Parse a top-level class or interface declaration. |
| 1827 | */ |
| 1828 | protected void parseClass() throws SyntaxError, IOException { |
| 1829 | String doc = scanner.docComment; |
| 1830 | |
| 1831 | // Parse the modifiers. |
| 1832 | int mod = parseModifiers(MM_CLASS | MM_MEMBER); |
| 1833 | |
| 1834 | parseNamedClass(mod, PACKAGE, doc); |
| 1835 | } |
| 1836 | |
| 1837 | // Current strict/default state of floating point. This is |
| 1838 | // set and reset with a stack discipline around methods and named |
| 1839 | // classes. Only M_STRICTFP may be set in this word. try... |
| 1840 | // finally is not needed to protect setting and resetting because |
| 1841 | // there are no error messages based on FPstate. |
| 1842 | private int FPstate = 0; |
| 1843 | |
| 1844 | /** |
| 1845 | * Parse a block-local class or interface declaration. |
| 1846 | */ |
| 1847 | protected Statement parseLocalClass(int mod) throws SyntaxError, IOException { |
| 1848 | long p = pos; |
| 1849 | ClassDefinition body = parseNamedClass(M_LOCAL | mod, STAT, null); |
| 1850 | Statement ds[] = { |
| 1851 | new VarDeclarationStatement(p, new LocalMember(body), null) |
| 1852 | }; |
| 1853 | Expression type = new TypeExpression(p, body.getType()); |
| 1854 | return new DeclarationStatement(p, 0, type, ds); |
| 1855 | } |
| 1856 | |
| 1857 | /** |
| 1858 | * Parse a named class or interface declaration, |
| 1859 | * starting at "class" or "interface". |
| 1860 | * @arg ctx Syntactic context of the class, one of {PACKAGE CLASS STAT EXPR}. |
| 1861 | */ |
| 1862 | protected ClassDefinition parseNamedClass(int mod, int ctx, String doc) throws SyntaxError, IOException { |
| 1863 | // Parse class/interface |
| 1864 | switch (token) { |
| 1865 | case INTERFACE: |
| 1866 | scan(); |
| 1867 | mod |= M_INTERFACE; |
| 1868 | break; |
| 1869 | |
| 1870 | case CLASS: |
| 1871 | scan(); |
| 1872 | break; |
| 1873 | |
| 1874 | default: |
| 1875 | env.error(pos, "class.expected"); |
| 1876 | break; |
| 1877 | } |
| 1878 | |
| 1879 | int oldFPstate = FPstate; |
| 1880 | if ((mod & M_STRICTFP)!=0) { |
| 1881 | FPstate = M_STRICTFP; |
| 1882 | } else { |
| 1883 | // The & (...) isn't really necessary here because we do maintain |
| 1884 | // the invariant that FPstate has no extra bits set. |
| 1885 | mod |= FPstate & M_STRICTFP; |
| 1886 | } |
| 1887 | |
| 1888 | // Parse the class name |
| 1889 | IdentifierToken nm = scanner.getIdToken(); |
| 1890 | long p = pos; |
| 1891 | expect(IDENT); |
| 1892 | |
| 1893 | Vector ext = new Vector(); |
| 1894 | Vector impl = new Vector(); |
| 1895 | parseInheritance(ext, impl); |
| 1896 | |
| 1897 | ClassDefinition tmp = parseClassBody(nm, mod, ctx, doc, ext, impl, p); |
| 1898 | |
| 1899 | FPstate = oldFPstate; |
| 1900 | |
| 1901 | return tmp; |
| 1902 | } |
| 1903 | |
| 1904 | protected void parseInheritance(Vector ext, Vector impl) throws SyntaxError, IOException { |
| 1905 | // Parse extends clause |
| 1906 | if (token == EXTENDS) { |
| 1907 | scan(); |
| 1908 | ext.addElement(parseName(false)); |
| 1909 | while (token == COMMA) { |
| 1910 | scan(); |
| 1911 | ext.addElement(parseName(false)); |
| 1912 | } |
| 1913 | } |
| 1914 | |
| 1915 | // Parse implements clause |
| 1916 | if (token == IMPLEMENTS) { |
| 1917 | scan(); |
| 1918 | impl.addElement(parseName(false)); |
| 1919 | while (token == COMMA) { |
| 1920 | scan(); |
| 1921 | impl.addElement(parseName(false)); |
| 1922 | } |
| 1923 | } |
| 1924 | } |
| 1925 | |
| 1926 | /** |
| 1927 | * Parse the body of a class or interface declaration, |
| 1928 | * starting at the left brace. |
| 1929 | */ |
| 1930 | protected ClassDefinition parseClassBody(IdentifierToken nm, int mod, |
| 1931 | int ctx, String doc, |
| 1932 | Vector ext, Vector impl, long p |
| 1933 | ) throws SyntaxError, IOException { |
| 1934 | // Decide which is the super class |
| 1935 | IdentifierToken sup = null; |
| 1936 | if ((mod & M_INTERFACE) != 0) { |
| 1937 | if (impl.size() > 0) { |
| 1938 | env.error(((IdentifierToken)impl.elementAt(0)).getWhere(), |
| 1939 | "intf.impl.intf"); |
| 1940 | } |
| 1941 | impl = ext; |
| 1942 | } else { |
| 1943 | if (ext.size() > 0) { |
| 1944 | if (ext.size() > 1) { |
| 1945 | env.error(((IdentifierToken)ext.elementAt(1)).getWhere(), |
| 1946 | "multiple.inherit"); |
| 1947 | } |
| 1948 | sup = (IdentifierToken)ext.elementAt(0); |
| 1949 | } |
| 1950 | } |
| 1951 | |
| 1952 | ClassDefinition oldClass = curClass; |
| 1953 | |
| 1954 | // Begin a new class |
| 1955 | IdentifierToken implids[] = new IdentifierToken[impl.size()]; |
| 1956 | impl.copyInto(implids); |
| 1957 | ClassDefinition newClass = |
| 1958 | actions.beginClass(p, doc, mod, nm, sup, implids); |
| 1959 | |
| 1960 | // Parse fields |
| 1961 | expect(LBRACE); |
| 1962 | while ((token != EOF) && (token != RBRACE)) { |
| 1963 | try { |
| 1964 | curClass = newClass; |
| 1965 | parseField(); |
| 1966 | } catch (SyntaxError e) { |
| 1967 | recoverField(newClass); |
| 1968 | } finally { |
| 1969 | curClass = oldClass; |
| 1970 | } |
| 1971 | } |
| 1972 | expect(RBRACE); |
| 1973 | |
| 1974 | // End the class |
| 1975 | actions.endClass(scanner.prevPos, newClass); |
| 1976 | return newClass; |
| 1977 | } |
| 1978 | |
| 1979 | /** |
| 1980 | * Recover after a syntax error in the file. |
| 1981 | * This involves discarding tokens until an EOF |
| 1982 | * or a possible legal continuation is encountered. |
| 1983 | */ |
| 1984 | protected void recoverFile() throws IOException { |
| 1985 | while (true) { |
| 1986 | switch (token) { |
| 1987 | case CLASS: |
| 1988 | case INTERFACE: |
| 1989 | // Start of a new source file statement, continue |
| 1990 | return; |
| 1991 | |
| 1992 | case LBRACE: |
| 1993 | match(LBRACE, RBRACE); |
| 1994 | scan(); |
| 1995 | break; |
| 1996 | |
| 1997 | case LPAREN: |
| 1998 | match(LPAREN, RPAREN); |
| 1999 | scan(); |
| 2000 | break; |
| 2001 | |
| 2002 | case LSQBRACKET: |
| 2003 | match(LSQBRACKET, RSQBRACKET); |
| 2004 | scan(); |
| 2005 | break; |
| 2006 | |
| 2007 | case EOF: |
| 2008 | return; |
| 2009 | |
| 2010 | default: |
| 2011 | // Don't know what to do, skip |
| 2012 | scan(); |
| 2013 | break; |
| 2014 | } |
| 2015 | } |
| 2016 | } |
| 2017 | |
| 2018 | /** |
| 2019 | * Parse an Java file. |
| 2020 | */ |
| 2021 | public void parseFile() { |
| 2022 | try { |
| 2023 | try { |
| 2024 | if (token == PACKAGE) { |
| 2025 | // Package statement |
| 2026 | long p = scan(); |
| 2027 | IdentifierToken id = parseName(false); |
| 2028 | expect(SEMICOLON); |
| 2029 | actions.packageDeclaration(p, id); |
| 2030 | } |
| 2031 | } catch (SyntaxError e) { |
| 2032 | recoverFile(); |
| 2033 | } |
| 2034 | while (token == IMPORT) { |
| 2035 | try{ |
| 2036 | // Import statement |
| 2037 | long p = scan(); |
| 2038 | IdentifierToken id = parseName(true); |
| 2039 | expect(SEMICOLON); |
| 2040 | if (id.id.getName().equals(idStar)) { |
| 2041 | id.id = id.id.getQualifier(); |
| 2042 | actions.importPackage(p, id); |
| 2043 | } else { |
| 2044 | actions.importClass(p, id); |
| 2045 | } |
| 2046 | } catch (SyntaxError e) { |
| 2047 | recoverFile(); |
| 2048 | } |
| 2049 | } |
| 2050 | |
| 2051 | while (token != EOF) { |
| 2052 | try { |
| 2053 | switch (token) { |
| 2054 | case FINAL: |
| 2055 | case PUBLIC: |
| 2056 | case PRIVATE: |
| 2057 | case ABSTRACT: |
| 2058 | case CLASS: |
| 2059 | case INTERFACE: |
| 2060 | case STRICTFP: |
| 2061 | // Start of a class |
| 2062 | parseClass(); |
| 2063 | break; |
| 2064 | |
| 2065 | case SEMICOLON: |
| 2066 | // Bogus semicolon. |
| 2067 | // According to the JLS (7.6,19.6), a TypeDeclaration |
| 2068 | // may consist of a single semicolon, however, this |
| 2069 | // usage is discouraged (JLS 7.6). In contrast, |
| 2070 | // a FieldDeclaration may not be empty, and is flagged |
| 2071 | // as an error. See parseField above. |
| 2072 | scan(); |
| 2073 | break; |
| 2074 | |
| 2075 | case EOF: |
| 2076 | // The end |
| 2077 | return; |
| 2078 | |
| 2079 | default: |
| 2080 | // Oops |
| 2081 | env.error(pos, "toplevel.expected"); |
| 2082 | throw new SyntaxError(); |
| 2083 | } |
| 2084 | } catch (SyntaxError e) { |
| 2085 | recoverFile(); |
| 2086 | } |
| 2087 | } |
| 2088 | } catch (IOException e) { |
| 2089 | env.error(pos, "io.exception", env.getSource()); |
| 2090 | return; |
| 2091 | } |
| 2092 | } |
| 2093 | |
| 2094 | /** |
| 2095 | * Usually <code>this.scanner == (Scanner)this</code>. |
| 2096 | * However, a delegate scanner can produce tokens for this parser, |
| 2097 | * in which case <code>(Scanner)this</code> is unused, |
| 2098 | * except for <code>this.token</code> and <code>this.pos</code> |
| 2099 | * instance variables which are filled from the real scanner |
| 2100 | * by <code>this.scan()</code> and the constructor. |
| 2101 | */ |
| 2102 | protected Scanner scanner; |
| 2103 | |
| 2104 | // Design Note: We ought to disinherit Parser from Scanner. |
| 2105 | // We also should split out the interface ParserActions from |
| 2106 | // Parser, and make BatchParser implement ParserActions, |
| 2107 | // not extend Parser. This would split scanning, parsing, |
| 2108 | // and class building into distinct responsibility areas. |
| 2109 | // (Perhaps tree building could be virtualized too.) |
| 2110 | |
| 2111 | public long scan() throws IOException { |
| 2112 | if (scanner != this && scanner != null) { |
| 2113 | long result = scanner.scan(); |
| 2114 | ((Scanner)this).token = scanner.token; |
| 2115 | ((Scanner)this).pos = scanner.pos; |
| 2116 | return result; |
| 2117 | } |
| 2118 | return super.scan(); |
| 2119 | } |
| 2120 | |
| 2121 | public void match(int open, int close) throws IOException { |
| 2122 | if (scanner != this) { |
| 2123 | scanner.match(open, close); |
| 2124 | ((Scanner)this).token = scanner.token; |
| 2125 | ((Scanner)this).pos = scanner.pos; |
| 2126 | return; |
| 2127 | } |
| 2128 | super.match(open, close); |
| 2129 | } |
| 2130 | } |