cgram.y revision 1.218
1 %{ 2 /* $NetBSD: cgram.y,v 1.218 2021/04/14 22:08:28 rillig Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. 6 * Copyright (c) 1994, 1995 Jochen Pohl 7 * All Rights Reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Jochen Pohl for 20 * The NetBSD Project. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) && !defined(lint) 38 __RCSID("$NetBSD: cgram.y,v 1.218 2021/04/14 22:08:28 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 int mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void ignore_up_to_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 printf("%s:%d: %s:%zu: clearing flags\n", 79 curr_pos.p_file, curr_pos.p_line, file, line); 80 clear_warn_flags(); 81 olwarn = LWARN_BAD; 82 } 83 84 static void 85 SAVE_WARN_FLAGS(const char *file, size_t line) 86 { 87 lint_assert(olwarn == LWARN_BAD); 88 printf("%s:%d: %s:%zu: saving flags %d\n", 89 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 90 olwarn = lwarn; 91 } 92 93 static void 94 RESTORE_WARN_FLAGS(const char *file, size_t line) 95 { 96 if (olwarn != LWARN_BAD) { 97 lwarn = olwarn; 98 printf("%s:%d: %s:%zu: restoring flags %d\n", 99 curr_pos.p_file, curr_pos.p_line, file, line, lwarn); 100 olwarn = LWARN_BAD; 101 } else 102 CLEAR_WARN_FLAGS(file, line); 103 } 104 #define cgram_debug(fmt, args...) printf("cgram_debug: " fmt "\n", ##args) 105 #else 106 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 107 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 108 #define RESTORE_WARN_FLAGS(f, l) \ 109 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 110 #define cgram_debug(fmt, args...) do { } while (false) 111 #endif 112 113 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 114 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 115 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 116 117 /* unbind the anonymous struct members from the struct */ 118 static void 119 anonymize(sym_t *s) 120 { 121 for ( ; s; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 177 127 128 %union { 129 val_t *y_val; 130 sbuf_t *y_sb; 131 sym_t *y_sym; 132 op_t y_op; 133 scl_t y_scl; 134 tspec_t y_tspec; 135 tqual_t y_tqual; 136 type_t *y_type; 137 tnode_t *y_tnode; 138 range_t y_range; 139 strg_t *y_string; 140 pqinf_t *y_pqinf; 141 int y_seen_statement; 142 }; 143 144 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 145 %token <y_op> T_MEMBACC 146 %token <y_op> T_UNARY 147 %token <y_op> T_INCDEC 148 %token T_SIZEOF 149 %token T_BUILTIN_OFFSETOF 150 %token T_TYPEOF 151 %token T_EXTENSION 152 %token T_ALIGNAS 153 %token T_ALIGNOF 154 %token T_ASTERISK 155 %token <y_op> T_MULTIPLICATIVE 156 %token <y_op> T_ADDITIVE 157 %token <y_op> T_SHIFT 158 %token <y_op> T_RELATIONAL 159 %token <y_op> T_EQUALITY 160 %token T_AMPER 161 %token T_BITXOR 162 %token T_BITOR 163 %token T_LOGAND 164 %token T_LOGOR 165 %token T_QUEST 166 %token T_COLON 167 %token T_ASSIGN 168 %token <y_op> T_OPASSIGN 169 %token T_COMMA 170 %token T_SEMI 171 %token T_ELLIPSIS 172 %token T_REAL 173 %token T_IMAG 174 %token T_GENERIC 175 %token T_NORETURN 176 177 /* storage classes (extern, static, auto, register and typedef) */ 178 %token <y_scl> T_SCLASS 179 180 /* 181 * predefined type keywords (char, int, short, long, unsigned, signed, 182 * float, double, void); see T_TYPENAME 183 */ 184 %token <y_tspec> T_TYPE 185 186 /* qualifiers (const, volatile, restrict, _Thread_local) */ 187 %token <y_tqual> T_QUAL 188 189 /* struct or union */ 190 %token <y_tspec> T_STRUCT_OR_UNION 191 192 /* remaining keywords */ 193 %token T_ASM 194 %token T_BREAK 195 %token T_CASE 196 %token T_CONTINUE 197 %token T_DEFAULT 198 %token T_DO 199 %token T_ELSE 200 %token T_ENUM 201 %token T_FOR 202 %token T_GOTO 203 %token T_IF 204 %token T_PACKED 205 %token T_RETURN 206 %token T_SWITCH 207 %token T_SYMBOLRENAME 208 %token T_WHILE 209 /* Type Attributes */ 210 %token <y_type> T_ATTRIBUTE 211 %token <y_type> T_AT_ALIAS 212 %token <y_type> T_AT_ALIGNED 213 %token <y_type> T_AT_ALLOC_SIZE 214 %token <y_type> T_AT_ALWAYS_INLINE 215 %token <y_type> T_AT_BOUNDED 216 %token <y_type> T_AT_BUFFER 217 %token <y_type> T_AT_COLD 218 %token <y_type> T_AT_CONSTRUCTOR 219 %token <y_type> T_AT_DEPRECATED 220 %token <y_type> T_AT_DESTRUCTOR 221 %token <y_type> T_AT_FALLTHROUGH 222 %token <y_type> T_AT_FORMAT 223 %token <y_type> T_AT_FORMAT_ARG 224 %token <y_type> T_AT_FORMAT_GNU_PRINTF 225 %token <y_type> T_AT_FORMAT_PRINTF 226 %token <y_type> T_AT_FORMAT_SCANF 227 %token <y_type> T_AT_FORMAT_STRFMON 228 %token <y_type> T_AT_FORMAT_STRFTIME 229 %token <y_type> T_AT_FORMAT_SYSLOG 230 %token <y_type> T_AT_GNU_INLINE 231 %token <y_type> T_AT_MALLOC 232 %token <y_type> T_AT_MAY_ALIAS 233 %token <y_type> T_AT_MINBYTES 234 %token <y_type> T_AT_MODE 235 %token <y_type> T_AT_NOINLINE 236 %token <y_type> T_AT_NONNULL 237 %token <y_type> T_AT_NORETURN 238 %token <y_type> T_AT_NOTHROW 239 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 240 %token <y_type> T_AT_OPTIMIZE 241 %token <y_type> T_AT_PACKED 242 %token <y_type> T_AT_PCS 243 %token <y_type> T_AT_PURE 244 %token <y_type> T_AT_RETURNS_TWICE 245 %token <y_type> T_AT_SECTION 246 %token <y_type> T_AT_SENTINEL 247 %token <y_type> T_AT_STRING 248 %token <y_type> T_AT_TLS_MODEL 249 %token <y_type> T_AT_TUNION 250 %token <y_type> T_AT_UNUSED 251 %token <y_type> T_AT_USED 252 %token <y_type> T_AT_VISIBILITY 253 %token <y_type> T_AT_WARN_UNUSED_RESULT 254 %token <y_type> T_AT_WEAK 255 256 %left T_COMMA 257 %right T_ASSIGN T_OPASSIGN 258 %right T_QUEST T_COLON 259 %left T_LOGOR 260 %left T_LOGAND 261 %left T_BITOR 262 %left T_BITXOR 263 %left T_AMPER 264 %left T_EQUALITY 265 %left T_RELATIONAL 266 %left T_SHIFT 267 %left T_ADDITIVE 268 %left T_ASTERISK T_MULTIPLICATIVE 269 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 270 %left T_LPAREN T_LBRACK T_MEMBACC 271 272 %token <y_sb> T_NAME 273 %token <y_sb> T_TYPENAME 274 %token <y_val> T_CON 275 %token <y_string> T_STRING 276 277 %type <y_sym> func_decl 278 %type <y_sym> notype_decl 279 %type <y_sym> type_decl 280 %type <y_type> typespec 281 %type <y_type> clrtyp_typespec 282 %type <y_type> notype_typespec 283 %type <y_type> struct_spec 284 %type <y_type> enum_spec 285 %type <y_type> type_attribute 286 %type <y_sym> struct_tag 287 %type <y_sym> enum_tag 288 %type <y_tspec> struct 289 %type <y_sym> struct_declaration 290 %type <y_sb> identifier 291 %type <y_sym> member_declaration_list_with_rbrace 292 %type <y_sym> member_declaration_list 293 %type <y_sym> member_declaration 294 %type <y_sym> notype_member_decls 295 %type <y_sym> type_member_decls 296 %type <y_sym> notype_member_decl 297 %type <y_sym> type_member_decl 298 %type <y_tnode> constant_expr 299 %type <y_tnode> array_size 300 %type <y_sym> enum_declaration 301 %type <y_sym> enums_with_opt_comma 302 %type <y_sym> enums 303 %type <y_sym> enumerator 304 %type <y_sym> enumeration_constant 305 %type <y_sym> notype_direct_decl 306 %type <y_sym> type_direct_decl 307 %type <y_pqinf> pointer 308 %type <y_pqinf> asterisk 309 %type <y_sym> param_decl 310 %type <y_sym> param_list 311 %type <y_sym> abstract_decl_param_list 312 %type <y_sym> direct_param_decl 313 %type <y_sym> notype_param_decl 314 %type <y_sym> direct_notype_param_decl 315 %type <y_pqinf> type_qualifier_list 316 %type <y_pqinf> type_qualifier 317 %type <y_sym> identifier_list 318 %type <y_sym> abstract_decl 319 %type <y_sym> direct_abstract_decl 320 %type <y_sym> vararg_parameter_type_list 321 %type <y_sym> parameter_type_list 322 %type <y_sym> parameter_declaration 323 %type <y_tnode> expr 324 %type <y_tnode> expr_statement_val 325 %type <y_tnode> expr_statement_list 326 %type <y_tnode> term 327 %type <y_tnode> generic_expr 328 %type <y_tnode> func_arg_list 329 %type <y_op> point_or_arrow 330 %type <y_type> type_name 331 %type <y_sym> abstract_declaration 332 %type <y_tnode> do_while_expr 333 %type <y_tnode> opt_expr 334 %type <y_string> string 335 %type <y_string> string2 336 %type <y_sb> opt_asm_or_symbolrename 337 %type <y_range> range 338 %type <y_seen_statement> block_item_list 339 %type <y_seen_statement> block_item 340 341 342 %% 343 344 program: 345 /* empty */ { 346 if (sflag) { 347 /* empty translation unit */ 348 error(272); 349 } else if (!tflag) { 350 /* empty translation unit */ 351 warning(272); 352 } 353 } 354 | translation_unit 355 ; 356 357 translation_unit: /* C99 6.9 */ 358 external_declaration 359 | translation_unit external_declaration 360 ; 361 362 external_declaration: /* C99 6.9 */ 363 asm_statement 364 | function_definition { 365 global_clean_up_decl(false); 366 clear_warning_flags(); 367 } 368 | top_level_declaration { 369 global_clean_up_decl(false); 370 clear_warning_flags(); 371 } 372 ; 373 374 /* 375 * On the top level, lint allows several forms of declarations that it doesn't 376 * allow in functions. For example, a single ';' is an empty declaration and 377 * is supported by some compilers, but in a function it would be an empty 378 * statement, not a declaration. This makes a difference in C90 mode, where 379 * a statement must not be followed by a declaration. 380 * 381 * See 'declaration' for all other declarations. 382 */ 383 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 384 T_SEMI { 385 if (sflag) { 386 /* empty declaration */ 387 error(0); 388 } else if (!tflag) { 389 /* empty declaration */ 390 warning(0); 391 } 392 } 393 | clrtyp deftyp notype_init_decls T_SEMI { 394 if (sflag) { 395 /* old style declaration; add 'int' */ 396 error(1); 397 } else if (!tflag) { 398 /* old style declaration; add 'int' */ 399 warning(1); 400 } 401 } 402 | declmods deftyp T_SEMI { 403 if (dcs->d_scl == TYPEDEF) { 404 /* typedef declares no type name */ 405 warning(72); 406 } else { 407 /* empty declaration */ 408 warning(2); 409 } 410 } 411 | declmods deftyp notype_init_decls T_SEMI 412 | declaration_specifiers deftyp T_SEMI { 413 if (dcs->d_scl == TYPEDEF) { 414 /* typedef declares no type name */ 415 warning(72); 416 } else if (!dcs->d_nonempty_decl) { 417 /* empty declaration */ 418 warning(2); 419 } 420 } 421 | declaration_specifiers deftyp type_init_decls T_SEMI 422 | error T_SEMI { 423 global_clean_up(); 424 } 425 | error T_RBRACE { 426 global_clean_up(); 427 } 428 ; 429 430 function_definition: /* C99 6.9.1 */ 431 func_decl { 432 if ($1->s_type->t_tspec != FUNC) { 433 /* syntax error '%s' */ 434 error(249, yytext); 435 YYERROR; 436 } 437 if ($1->s_type->t_typedef) { 438 /* ()-less function definition */ 439 error(64); 440 YYERROR; 441 } 442 funcdef($1); 443 block_level++; 444 begin_declaration_level(ARG); 445 if (lwarn == LWARN_NONE) 446 $1->s_used = true; 447 } arg_declaration_list_opt { 448 end_declaration_level(); 449 block_level--; 450 check_func_lint_directives(); 451 check_func_old_style_arguments(); 452 begin_control_statement(CS_FUNCTION_BODY); 453 } compound_statement { 454 funcend(); 455 end_control_statement(CS_FUNCTION_BODY); 456 } 457 ; 458 459 func_decl: 460 clrtyp deftyp notype_decl { 461 $$ = $3; 462 } 463 | declmods deftyp notype_decl { 464 $$ = $3; 465 } 466 | declaration_specifiers deftyp type_decl { 467 $$ = $3; 468 } 469 ; 470 471 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 472 /* empty */ 473 | arg_declaration_list 474 ; 475 476 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 477 arg_declaration 478 | arg_declaration_list arg_declaration 479 /* XXX or better "arg_declaration error" ? */ 480 | error 481 ; 482 483 /* 484 * "arg_declaration" is separated from "declaration" because it 485 * needs other error handling. 486 */ 487 arg_declaration: 488 declmods deftyp T_SEMI { 489 /* empty declaration */ 490 warning(2); 491 } 492 | declmods deftyp notype_init_decls T_SEMI 493 | declaration_specifiers deftyp T_SEMI { 494 if (!dcs->d_nonempty_decl) { 495 /* empty declaration */ 496 warning(2); 497 } else { 498 /* '%s' declared in argument declaration list */ 499 warning(3, type_name(dcs->d_type)); 500 } 501 } 502 | declaration_specifiers deftyp type_init_decls T_SEMI { 503 if (dcs->d_nonempty_decl) { 504 /* '%s' declared in argument declaration list */ 505 warning(3, type_name(dcs->d_type)); 506 } 507 } 508 | declmods error 509 | declaration_specifiers error 510 ; 511 512 declaration: /* C99 6.7 */ 513 declmods deftyp T_SEMI { 514 if (dcs->d_scl == TYPEDEF) { 515 /* typedef declares no type name */ 516 warning(72); 517 } else { 518 /* empty declaration */ 519 warning(2); 520 } 521 } 522 | declmods deftyp notype_init_decls T_SEMI 523 | declaration_specifiers deftyp T_SEMI { 524 if (dcs->d_scl == TYPEDEF) { 525 /* typedef declares no type name */ 526 warning(72); 527 } else if (!dcs->d_nonempty_decl) { 528 /* empty declaration */ 529 warning(2); 530 } 531 } 532 | declaration_specifiers deftyp type_init_decls T_SEMI 533 | error T_SEMI 534 ; 535 536 type_attribute_format_type: 537 T_AT_FORMAT_GNU_PRINTF 538 | T_AT_FORMAT_PRINTF 539 | T_AT_FORMAT_SCANF 540 | T_AT_FORMAT_STRFMON 541 | T_AT_FORMAT_STRFTIME 542 | T_AT_FORMAT_SYSLOG 543 ; 544 545 type_attribute_bounded_type: 546 T_AT_MINBYTES 547 | T_AT_STRING 548 | T_AT_BUFFER 549 ; 550 551 552 type_attribute_spec: 553 /* empty */ 554 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 555 | T_AT_DEPRECATED 556 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 557 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 558 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 559 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 560 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 561 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 562 | T_AT_SENTINEL 563 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 564 | T_AT_NONNULL T_LPAREN constant_expr T_RPAREN 565 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 566 | T_AT_ALIAS T_LPAREN string T_RPAREN 567 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 568 | T_AT_PCS T_LPAREN string T_RPAREN 569 | T_AT_SECTION T_LPAREN string T_RPAREN 570 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 571 | T_AT_ALIGNED 572 | T_AT_CONSTRUCTOR 573 | T_AT_DESTRUCTOR 574 | T_AT_MALLOC 575 | T_AT_MAY_ALIAS 576 | T_AT_NO_INSTRUMENT_FUNCTION 577 | T_AT_NOINLINE 578 | T_AT_NORETURN 579 | T_AT_NOTHROW 580 | T_AT_COLD 581 | T_AT_RETURNS_TWICE 582 | T_AT_PACKED { 583 addpacked(); 584 } 585 | T_AT_PURE 586 | T_AT_TUNION 587 | T_AT_GNU_INLINE 588 | T_AT_ALWAYS_INLINE 589 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 590 constant_expr T_COMMA constant_expr T_RPAREN 591 | T_AT_USED { 592 add_attr_used(); 593 } 594 | T_AT_UNUSED { 595 add_attr_used(); 596 } 597 | T_AT_WARN_UNUSED_RESULT 598 | T_AT_WEAK 599 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 600 | T_AT_FALLTHROUGH { 601 fallthru(1); 602 } 603 | T_QUAL { 604 if ($1 != CONST) 605 yyerror("Bad attribute"); 606 } 607 ; 608 609 type_attribute_spec_list: 610 type_attribute_spec 611 | type_attribute_spec_list T_COMMA type_attribute_spec 612 ; 613 614 align_as: 615 typespec 616 | constant_expr 617 ; 618 619 type_attribute: 620 T_ATTRIBUTE T_LPAREN T_LPAREN { 621 attron = true; 622 } type_attribute_spec_list { 623 attron = false; 624 } T_RPAREN T_RPAREN 625 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 626 } 627 | T_PACKED { 628 addpacked(); 629 } 630 | T_NORETURN { 631 } 632 ; 633 634 type_attribute_list: 635 type_attribute 636 | type_attribute_list type_attribute 637 ; 638 639 clrtyp: 640 /* empty */ { 641 clrtyp(); 642 } 643 ; 644 645 deftyp: 646 /* empty */ { 647 deftyp(); 648 } 649 ; 650 651 declaration_specifiers: /* C99 6.7 */ 652 clrtyp_typespec { 653 add_type($1); 654 } 655 | declmods typespec { 656 add_type($2); 657 } 658 | type_attribute declaration_specifiers 659 | declaration_specifiers declmod 660 | declaration_specifiers notype_typespec { 661 add_type($2); 662 } 663 ; 664 665 declmods: 666 clrtyp T_QUAL { 667 add_qualifier($2); 668 } 669 | clrtyp T_SCLASS { 670 add_storage_class($2); 671 } 672 | declmods declmod 673 ; 674 675 declmod: 676 T_QUAL { 677 add_qualifier($1); 678 } 679 | T_SCLASS { 680 add_storage_class($1); 681 } 682 | type_attribute_list 683 ; 684 685 clrtyp_typespec: 686 clrtyp notype_typespec { 687 $$ = $2; 688 } 689 | T_TYPENAME clrtyp { 690 $$ = getsym($1)->s_type; 691 } 692 ; 693 694 typespec: 695 notype_typespec { 696 $$ = $1; 697 } 698 | T_TYPENAME { 699 $$ = getsym($1)->s_type; 700 } 701 ; 702 703 notype_typespec: 704 T_TYPE { 705 $$ = gettyp($1); 706 } 707 | T_TYPEOF term { 708 $$ = $2->tn_type; 709 } 710 | struct_spec { 711 end_declaration_level(); 712 $$ = $1; 713 } 714 | enum_spec { 715 end_declaration_level(); 716 $$ = $1; 717 } 718 ; 719 720 struct_spec: 721 struct struct_tag { 722 /* 723 * STDC requires that "struct a;" always introduces 724 * a new tag if "a" is not declared at current level 725 * 726 * yychar is valid because otherwise the parser would not 727 * have been able to decide if it must shift or reduce 728 */ 729 $$ = mktag($2, $1, false, yychar == T_SEMI); 730 } 731 | struct struct_tag { 732 dcs->d_tagtyp = mktag($2, $1, true, false); 733 } struct_declaration { 734 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 735 } 736 | struct { 737 dcs->d_tagtyp = mktag(NULL, $1, true, false); 738 } struct_declaration { 739 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 740 } 741 | struct error { 742 symtyp = FVFT; 743 $$ = gettyp(INT); 744 } 745 ; 746 747 struct: 748 struct type_attribute 749 | T_STRUCT_OR_UNION { 750 symtyp = FTAG; 751 begin_declaration_level($1 == STRUCT ? MOS : MOU); 752 dcs->d_offset = 0; 753 dcs->d_stralign = CHAR_SIZE; 754 $$ = $1; 755 } 756 ; 757 758 struct_tag: 759 identifier { 760 $$ = getsym($1); 761 } 762 ; 763 764 struct_declaration: 765 struct_decl_lbrace member_declaration_list_with_rbrace { 766 $$ = $2; 767 } 768 ; 769 770 struct_decl_lbrace: 771 T_LBRACE { 772 symtyp = FVFT; 773 } 774 ; 775 776 member_declaration_list_with_rbrace: 777 member_declaration_list T_SEMI T_RBRACE { 778 $$ = $1; 779 } 780 | member_declaration_list T_RBRACE { 781 if (sflag) { 782 /* syntax req. ';' after last struct/union member */ 783 error(66); 784 } else { 785 /* syntax req. ';' after last struct/union member */ 786 warning(66); 787 } 788 $$ = $1; 789 } 790 | T_RBRACE { 791 $$ = NULL; 792 } 793 ; 794 795 opt_type_attribute: 796 /* empty */ 797 | type_attribute 798 ; 799 800 member_declaration_list: 801 member_declaration { 802 $$ = $1; 803 } 804 | member_declaration_list T_SEMI member_declaration { 805 $$ = lnklst($1, $3); 806 } 807 ; 808 809 member_declaration: 810 noclass_declmods deftyp { 811 /* too late, i know, but getsym() compensates it */ 812 symtyp = FMEMBER; 813 } notype_member_decls opt_type_attribute { 814 symtyp = FVFT; 815 $$ = $4; 816 } 817 | noclass_declspecs deftyp { 818 symtyp = FMEMBER; 819 } type_member_decls opt_type_attribute { 820 symtyp = FVFT; 821 $$ = $4; 822 } 823 | noclass_declmods deftyp opt_type_attribute { 824 symtyp = FVFT; 825 /* struct or union member must be named */ 826 if (!Sflag) 827 /* anonymous struct/union members is a C9X feature */ 828 warning(49); 829 /* add all the members of the anonymous struct/union */ 830 $$ = dcs->d_type->t_str->sou_first_member; 831 anonymize($$); 832 } 833 | noclass_declspecs deftyp opt_type_attribute { 834 symtyp = FVFT; 835 /* struct or union member must be named */ 836 if (!Sflag) 837 /* anonymous struct/union members is a C9X feature */ 838 warning(49); 839 $$ = dcs->d_type->t_str->sou_first_member; 840 /* add all the members of the anonymous struct/union */ 841 anonymize($$); 842 } 843 | error { 844 symtyp = FVFT; 845 $$ = NULL; 846 } 847 ; 848 849 noclass_declspecs: 850 clrtyp_typespec { 851 add_type($1); 852 } 853 | type_attribute noclass_declspecs 854 | noclass_declmods typespec { 855 add_type($2); 856 } 857 | noclass_declspecs T_QUAL { 858 add_qualifier($2); 859 } 860 | noclass_declspecs notype_typespec { 861 add_type($2); 862 } 863 | noclass_declspecs type_attribute 864 ; 865 866 noclass_declmods: 867 clrtyp T_QUAL { 868 add_qualifier($2); 869 } 870 | noclass_declmods T_QUAL { 871 add_qualifier($2); 872 } 873 ; 874 875 notype_member_decls: 876 notype_member_decl { 877 $$ = declarator_1_struct_union($1); 878 } 879 | notype_member_decls { 880 symtyp = FMEMBER; 881 } T_COMMA type_member_decl { 882 $$ = lnklst($1, declarator_1_struct_union($4)); 883 } 884 ; 885 886 type_member_decls: 887 type_member_decl { 888 $$ = declarator_1_struct_union($1); 889 } 890 | type_member_decls { 891 symtyp = FMEMBER; 892 } T_COMMA type_member_decl { 893 $$ = lnklst($1, declarator_1_struct_union($4)); 894 } 895 ; 896 897 notype_member_decl: 898 notype_decl { 899 $$ = $1; 900 } 901 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 902 $$ = bitfield($1, to_int_constant($3, true)); 903 } 904 | { 905 symtyp = FVFT; 906 } T_COLON constant_expr { /* C99 6.7.2.1 */ 907 $$ = bitfield(NULL, to_int_constant($3, true)); 908 } 909 ; 910 911 type_member_decl: 912 type_decl { 913 $$ = $1; 914 } 915 | type_decl T_COLON constant_expr { 916 $$ = bitfield($1, to_int_constant($3, true)); 917 } 918 | { 919 symtyp = FVFT; 920 } T_COLON constant_expr { 921 $$ = bitfield(NULL, to_int_constant($3, true)); 922 } 923 ; 924 925 enum_spec: 926 enum enum_tag { 927 $$ = mktag($2, ENUM, false, false); 928 } 929 | enum enum_tag { 930 dcs->d_tagtyp = mktag($2, ENUM, true, false); 931 } enum_declaration { 932 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 933 } 934 | enum { 935 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 936 } enum_declaration { 937 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 938 } 939 | enum error { 940 symtyp = FVFT; 941 $$ = gettyp(INT); 942 } 943 ; 944 945 enum: 946 T_ENUM { 947 symtyp = FTAG; 948 begin_declaration_level(CTCONST); 949 } 950 ; 951 952 enum_tag: 953 identifier { 954 $$ = getsym($1); 955 } 956 ; 957 958 enum_declaration: 959 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 960 $$ = $2; 961 } 962 ; 963 964 enum_decl_lbrace: 965 T_LBRACE { 966 symtyp = FVFT; 967 enumval = 0; 968 } 969 ; 970 971 enums_with_opt_comma: 972 enums { 973 $$ = $1; 974 } 975 | enums T_COMMA { 976 if (sflag) { 977 /* trailing ',' prohibited in enum declaration */ 978 error(54); 979 } else { 980 /* trailing ',' prohibited in enum declaration */ 981 c99ism(54); 982 } 983 $$ = $1; 984 } 985 ; 986 987 enums: 988 enumerator { 989 $$ = $1; 990 } 991 | enums T_COMMA enumerator { 992 $$ = lnklst($1, $3); 993 } 994 | error { 995 $$ = NULL; 996 } 997 ; 998 999 enumerator: 1000 enumeration_constant { 1001 $$ = enumeration_constant($1, enumval, true); 1002 } 1003 | enumeration_constant T_ASSIGN constant_expr { 1004 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1005 } 1006 ; 1007 1008 enumeration_constant: /* C99 6.4.4.3 */ 1009 identifier { 1010 $$ = getsym($1); 1011 } 1012 ; 1013 1014 1015 notype_init_decls: 1016 notype_init_decl 1017 | notype_init_decls T_COMMA type_init_decl 1018 ; 1019 1020 type_init_decls: 1021 type_init_decl 1022 | type_init_decls T_COMMA type_init_decl 1023 ; 1024 1025 notype_init_decl: 1026 notype_decl opt_asm_or_symbolrename { 1027 cgram_declare($1, false, $2); 1028 check_size($1); 1029 } 1030 | notype_decl opt_asm_or_symbolrename { 1031 begin_initialization($1); 1032 cgram_declare($1, true, $2); 1033 } T_ASSIGN initializer { 1034 check_size($1); 1035 end_initialization(); 1036 } 1037 ; 1038 1039 type_init_decl: 1040 type_decl opt_asm_or_symbolrename { 1041 cgram_declare($1, false, $2); 1042 check_size($1); 1043 } 1044 | type_decl opt_asm_or_symbolrename { 1045 begin_initialization($1); 1046 cgram_declare($1, true, $2); 1047 } T_ASSIGN initializer { 1048 check_size($1); 1049 end_initialization(); 1050 } 1051 ; 1052 1053 notype_decl: 1054 notype_direct_decl { 1055 $$ = $1; 1056 } 1057 | pointer notype_direct_decl { 1058 $$ = add_pointer($2, $1); 1059 } 1060 ; 1061 1062 notype_direct_decl: 1063 T_NAME { 1064 $$ = declarator_name(getsym($1)); 1065 } 1066 | T_LPAREN type_decl T_RPAREN { 1067 $$ = $2; 1068 } 1069 | type_attribute notype_direct_decl { 1070 $$ = $2; 1071 } 1072 | notype_direct_decl T_LBRACK T_RBRACK { 1073 $$ = add_array($1, false, 0); 1074 } 1075 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1076 $$ = add_array($1, true, to_int_constant($3, false)); 1077 } 1078 | notype_direct_decl param_list opt_asm_or_symbolrename { 1079 $$ = add_function(symbolrename($1, $3), $2); 1080 end_declaration_level(); 1081 block_level--; 1082 } 1083 | notype_direct_decl type_attribute_list 1084 ; 1085 1086 type_decl: 1087 type_direct_decl { 1088 $$ = $1; 1089 } 1090 | pointer type_direct_decl { 1091 $$ = add_pointer($2, $1); 1092 } 1093 ; 1094 1095 type_direct_decl: 1096 identifier { 1097 $$ = declarator_name(getsym($1)); 1098 } 1099 | T_LPAREN type_decl T_RPAREN { 1100 $$ = $2; 1101 } 1102 | type_attribute type_direct_decl { 1103 $$ = $2; 1104 } 1105 | type_direct_decl T_LBRACK T_RBRACK { 1106 $$ = add_array($1, false, 0); 1107 } 1108 | type_direct_decl T_LBRACK array_size T_RBRACK { 1109 $$ = add_array($1, true, to_int_constant($3, false)); 1110 } 1111 | type_direct_decl param_list opt_asm_or_symbolrename { 1112 $$ = add_function(symbolrename($1, $3), $2); 1113 end_declaration_level(); 1114 block_level--; 1115 } 1116 | type_direct_decl type_attribute_list 1117 ; 1118 1119 /* 1120 * param_decl and notype_param_decl exist to avoid a conflict in 1121 * argument lists. A typename enclosed in parens should always be 1122 * treated as a typename, not an argument. 1123 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1124 * not "typedef int a; f(int a);" 1125 */ 1126 param_decl: 1127 direct_param_decl { 1128 $$ = $1; 1129 } 1130 | pointer direct_param_decl { 1131 $$ = add_pointer($2, $1); 1132 } 1133 ; 1134 1135 opt_type_qualifier_list: 1136 /* empty */ 1137 | type_qualifier_list 1138 ; 1139 1140 array_size: 1141 opt_type_qualifier_list T_SCLASS constant_expr { 1142 /* C11 6.7.6.3p7 */ 1143 if ($2 != STATIC) 1144 yyerror("Bad attribute"); 1145 /* static array size is a C11 extension */ 1146 c11ism(343); 1147 $$ = $3; 1148 } 1149 | constant_expr { 1150 $$ = $1; 1151 } 1152 ; 1153 1154 direct_param_decl: 1155 identifier type_attribute_list { 1156 $$ = declarator_name(getsym($1)); 1157 } 1158 | identifier { 1159 $$ = declarator_name(getsym($1)); 1160 } 1161 | T_LPAREN notype_param_decl T_RPAREN { 1162 $$ = $2; 1163 } 1164 | direct_param_decl T_LBRACK T_RBRACK { 1165 $$ = add_array($1, false, 0); 1166 } 1167 | direct_param_decl T_LBRACK array_size T_RBRACK { 1168 $$ = add_array($1, true, to_int_constant($3, false)); 1169 } 1170 | direct_param_decl param_list opt_asm_or_symbolrename { 1171 $$ = add_function(symbolrename($1, $3), $2); 1172 end_declaration_level(); 1173 block_level--; 1174 } 1175 ; 1176 1177 notype_param_decl: 1178 direct_notype_param_decl { 1179 $$ = $1; 1180 } 1181 | pointer direct_notype_param_decl { 1182 $$ = add_pointer($2, $1); 1183 } 1184 ; 1185 1186 direct_notype_param_decl: 1187 identifier { 1188 $$ = declarator_name(getsym($1)); 1189 } 1190 | T_LPAREN notype_param_decl T_RPAREN { 1191 $$ = $2; 1192 } 1193 | direct_notype_param_decl T_LBRACK T_RBRACK { 1194 $$ = add_array($1, false, 0); 1195 } 1196 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1197 $$ = add_array($1, true, to_int_constant($3, false)); 1198 } 1199 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1200 $$ = add_function(symbolrename($1, $3), $2); 1201 end_declaration_level(); 1202 block_level--; 1203 } 1204 ; 1205 1206 pointer: 1207 asterisk { 1208 $$ = $1; 1209 } 1210 | asterisk type_qualifier_list { 1211 $$ = merge_pointers_and_qualifiers($1, $2); 1212 } 1213 | asterisk pointer { 1214 $$ = merge_pointers_and_qualifiers($1, $2); 1215 } 1216 | asterisk type_qualifier_list pointer { 1217 $$ = merge_pointers_and_qualifiers($1, $2); 1218 $$ = merge_pointers_and_qualifiers($$, $3); 1219 } 1220 ; 1221 1222 asterisk: 1223 T_ASTERISK { 1224 $$ = xcalloc(1, sizeof(*$$)); 1225 $$->p_pcnt = 1; 1226 } 1227 ; 1228 1229 type_qualifier_list: 1230 type_qualifier { 1231 $$ = $1; 1232 } 1233 | type_qualifier_list type_qualifier { 1234 $$ = merge_pointers_and_qualifiers($1, $2); 1235 } 1236 ; 1237 1238 type_qualifier: 1239 T_QUAL { 1240 $$ = xcalloc(1, sizeof(*$$)); 1241 if ($1 == CONST) { 1242 $$->p_const = true; 1243 } else if ($1 == VOLATILE) { 1244 $$->p_volatile = true; 1245 } else { 1246 lint_assert($1 == RESTRICT || $1 == THREAD); 1247 } 1248 } 1249 ; 1250 1251 param_list: 1252 id_list_lparen identifier_list T_RPAREN { 1253 $$ = $2; 1254 } 1255 | abstract_decl_param_list { 1256 $$ = $1; 1257 } 1258 ; 1259 1260 id_list_lparen: 1261 T_LPAREN { 1262 block_level++; 1263 begin_declaration_level(PROTO_ARG); 1264 } 1265 ; 1266 1267 identifier_list: 1268 T_NAME { 1269 $$ = old_style_function_name(getsym($1)); 1270 } 1271 | identifier_list T_COMMA T_NAME { 1272 $$ = lnklst($1, old_style_function_name(getsym($3))); 1273 } 1274 | identifier_list error { 1275 $$ = $1; 1276 } 1277 ; 1278 1279 abstract_decl_param_list: 1280 abstract_decl_lparen T_RPAREN opt_type_attribute { 1281 $$ = NULL; 1282 } 1283 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1284 dcs->d_proto = true; 1285 $$ = $2; 1286 } 1287 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1288 $$ = NULL; 1289 } 1290 ; 1291 1292 abstract_decl_lparen: 1293 T_LPAREN { 1294 block_level++; 1295 begin_declaration_level(PROTO_ARG); 1296 } 1297 ; 1298 1299 vararg_parameter_type_list: 1300 parameter_type_list { 1301 $$ = $1; 1302 } 1303 | parameter_type_list T_COMMA T_ELLIPSIS { 1304 dcs->d_vararg = true; 1305 $$ = $1; 1306 } 1307 | T_ELLIPSIS { 1308 if (sflag) { 1309 /* ANSI C requires formal parameter before '...' */ 1310 error(84); 1311 } else if (!tflag) { 1312 /* ANSI C requires formal parameter before '...' */ 1313 warning(84); 1314 } 1315 dcs->d_vararg = true; 1316 $$ = NULL; 1317 } 1318 ; 1319 1320 parameter_type_list: 1321 parameter_declaration { 1322 $$ = $1; 1323 } 1324 | parameter_type_list T_COMMA parameter_declaration { 1325 $$ = lnklst($1, $3); 1326 } 1327 ; 1328 1329 parameter_declaration: 1330 declmods deftyp { 1331 $$ = declare_argument(abstract_name(), false); 1332 } 1333 | declaration_specifiers deftyp { 1334 $$ = declare_argument(abstract_name(), false); 1335 } 1336 | declmods deftyp notype_param_decl { 1337 $$ = declare_argument($3, false); 1338 } 1339 /* 1340 * param_decl is needed because of following conflict: 1341 * "typedef int a; f(int (a));" could be parsed as 1342 * "function with argument a of type int", or 1343 * "function with an abstract argument of type function". 1344 * This grammar realizes the second case. 1345 */ 1346 | declaration_specifiers deftyp param_decl { 1347 $$ = declare_argument($3, false); 1348 } 1349 | declmods deftyp abstract_decl { 1350 $$ = declare_argument($3, false); 1351 } 1352 | declaration_specifiers deftyp abstract_decl { 1353 $$ = declare_argument($3, false); 1354 } 1355 ; 1356 1357 opt_asm_or_symbolrename: /* expect only one */ 1358 /* empty */ { 1359 $$ = NULL; 1360 } 1361 | T_ASM T_LPAREN T_STRING T_RPAREN { 1362 freeyyv(&$3, T_STRING); 1363 $$ = NULL; 1364 } 1365 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1366 $$ = $3; 1367 } 1368 ; 1369 1370 initializer: /* C99 6.7.8 "Initialization" */ 1371 expr %prec T_COMMA { 1372 init_expr($1); 1373 } 1374 | init_lbrace init_rbrace { 1375 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1376 } 1377 | init_lbrace initializer_list comma_opt init_rbrace 1378 | error 1379 ; 1380 1381 initializer_list: /* C99 6.7.8 "Initialization" */ 1382 initializer_list_item 1383 | initializer_list T_COMMA initializer_list_item 1384 ; 1385 1386 initializer_list_item: 1387 designation initializer 1388 | initializer 1389 ; 1390 1391 range: 1392 constant_expr { 1393 $$.lo = to_int_constant($1, true); 1394 $$.hi = $$.lo; 1395 } 1396 | constant_expr T_ELLIPSIS constant_expr { 1397 $$.lo = to_int_constant($1, true); 1398 $$.hi = to_int_constant($3, true); 1399 /* initialization with '[a...b]' is a GNU extension */ 1400 gnuism(340); 1401 } 1402 ; 1403 1404 designator: /* C99 6.7.8 "Initialization" */ 1405 T_LBRACK range T_RBRACK { 1406 add_designator_subscript($2); 1407 if (!Sflag) 1408 /* array initializer with des.s is a C9X feature */ 1409 warning(321); 1410 } 1411 | point identifier { 1412 if (!Sflag) 1413 /* struct or union member name in initializer is ... */ 1414 warning(313); 1415 add_designator_member($2); 1416 } 1417 ; 1418 1419 designator_list: /* C99 6.7.8 "Initialization" */ 1420 designator 1421 | designator_list designator 1422 ; 1423 1424 designation: /* C99 6.7.8 "Initialization" */ 1425 designator_list T_ASSIGN 1426 | identifier T_COLON { 1427 /* GCC style struct or union member name in initializer */ 1428 gnuism(315); 1429 add_designator_member($1); 1430 } 1431 ; 1432 1433 init_lbrace: 1434 T_LBRACE { 1435 init_lbrace(); 1436 } 1437 ; 1438 1439 init_rbrace: 1440 T_RBRACE { 1441 init_rbrace(); 1442 } 1443 ; 1444 1445 type_name: 1446 { 1447 begin_declaration_level(ABSTRACT); 1448 } abstract_declaration { 1449 end_declaration_level(); 1450 $$ = $2->s_type; 1451 } 1452 ; 1453 1454 abstract_declaration: 1455 noclass_declmods deftyp { 1456 $$ = declare_1_abstract(abstract_name()); 1457 } 1458 | noclass_declspecs deftyp { 1459 $$ = declare_1_abstract(abstract_name()); 1460 } 1461 | noclass_declmods deftyp abstract_decl { 1462 $$ = declare_1_abstract($3); 1463 } 1464 | noclass_declspecs deftyp abstract_decl { 1465 $$ = declare_1_abstract($3); 1466 } 1467 ; 1468 1469 abstract_decl: 1470 pointer { 1471 $$ = add_pointer(abstract_name(), $1); 1472 } 1473 | direct_abstract_decl { 1474 $$ = $1; 1475 } 1476 | pointer direct_abstract_decl { 1477 $$ = add_pointer($2, $1); 1478 } 1479 | T_TYPEOF term { 1480 $$ = mktempsym($2->tn_type); 1481 } 1482 ; 1483 1484 direct_abstract_decl: 1485 T_LPAREN abstract_decl T_RPAREN { 1486 $$ = $2; 1487 } 1488 | T_LBRACK T_RBRACK { 1489 $$ = add_array(abstract_name(), false, 0); 1490 } 1491 | T_LBRACK array_size T_RBRACK { 1492 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1493 } 1494 | type_attribute direct_abstract_decl { 1495 $$ = $2; 1496 } 1497 | direct_abstract_decl T_LBRACK T_RBRACK { 1498 $$ = add_array($1, false, 0); 1499 } 1500 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1501 $$ = add_array($1, true, to_int_constant($3, false)); 1502 } 1503 | abstract_decl_param_list opt_asm_or_symbolrename { 1504 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1505 end_declaration_level(); 1506 block_level--; 1507 } 1508 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1509 $$ = add_function(symbolrename($1, $3), $2); 1510 end_declaration_level(); 1511 block_level--; 1512 } 1513 | direct_abstract_decl type_attribute_list 1514 ; 1515 1516 non_expr_statement: 1517 type_attribute T_SEMI 1518 | labeled_statement 1519 | compound_statement 1520 | selection_statement 1521 | iteration_statement 1522 | jump_statement { 1523 seen_fallthrough = false; 1524 } 1525 | asm_statement 1526 ; 1527 1528 statement: /* C99 6.8 */ 1529 expr_statement 1530 | non_expr_statement 1531 ; 1532 1533 labeled_statement: /* C99 6.8.1 */ 1534 label statement 1535 ; 1536 1537 label: 1538 T_NAME T_COLON { 1539 symtyp = FLABEL; 1540 named_label(getsym($1)); 1541 } 1542 | T_CASE constant_expr T_COLON { 1543 case_label($2); 1544 seen_fallthrough = true; 1545 } 1546 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1547 /* XXX: We don't fill all cases */ 1548 case_label($2); 1549 seen_fallthrough = true; 1550 } 1551 | T_DEFAULT T_COLON { 1552 default_label(); 1553 seen_fallthrough = true; 1554 } 1555 ; 1556 1557 compound_statement: /* C99 6.8.2 */ 1558 compound_statement_lbrace compound_statement_rbrace 1559 | compound_statement_lbrace block_item_list compound_statement_rbrace 1560 ; 1561 1562 compound_statement_lbrace: 1563 T_LBRACE { 1564 block_level++; 1565 mem_block_level++; 1566 begin_declaration_level(AUTO); 1567 } 1568 ; 1569 1570 compound_statement_rbrace: 1571 T_RBRACE { 1572 end_declaration_level(); 1573 freeblk(); 1574 mem_block_level--; 1575 block_level--; 1576 seen_fallthrough = false; 1577 } 1578 ; 1579 1580 block_item_list: 1581 block_item 1582 | block_item_list block_item { 1583 if (!Sflag && $1 && !$2) 1584 /* declarations after statements is a C99 feature */ 1585 c99ism(327); 1586 } 1587 ; 1588 1589 block_item: 1590 statement { 1591 $$ = true; 1592 restore_warning_flags(); 1593 } 1594 | declaration { 1595 $$ = false; 1596 restore_warning_flags(); 1597 } 1598 ; 1599 1600 expr_statement: 1601 expr T_SEMI { 1602 expr($1, false, false, false, false); 1603 seen_fallthrough = false; 1604 } 1605 | T_SEMI { 1606 seen_fallthrough = false; 1607 } 1608 ; 1609 1610 /* 1611 * The following two productions are used to implement 1612 * ({ [[decl-list] stmt-list] }). 1613 * XXX: This is not well tested. 1614 */ 1615 expr_statement_val: 1616 expr T_SEMI { 1617 /* XXX: We should really do that only on the last name */ 1618 if ($1->tn_op == NAME) 1619 $1->tn_sym->s_used = true; 1620 $$ = $1; 1621 expr($1, false, false, false, false); 1622 seen_fallthrough = false; 1623 } 1624 | non_expr_statement { 1625 $$ = expr_zalloc_tnode(); 1626 $$->tn_type = gettyp(VOID); 1627 } 1628 ; 1629 1630 expr_statement_list: 1631 expr_statement_val 1632 | expr_statement_list expr_statement_val { 1633 $$ = $2; 1634 } 1635 ; 1636 1637 selection_statement: /* C99 6.8.4 */ 1638 if_without_else { 1639 save_warning_flags(); 1640 if2(); 1641 if3(false); 1642 } 1643 | if_without_else T_ELSE { 1644 save_warning_flags(); 1645 if2(); 1646 } statement { 1647 clear_warning_flags(); 1648 if3(true); 1649 } 1650 | if_without_else T_ELSE error { 1651 clear_warning_flags(); 1652 if3(false); 1653 } 1654 | switch_expr statement { 1655 clear_warning_flags(); 1656 switch2(); 1657 } 1658 | switch_expr error { 1659 clear_warning_flags(); 1660 switch2(); 1661 } 1662 ; 1663 1664 if_without_else: 1665 if_expr statement 1666 | if_expr error 1667 ; 1668 1669 if_expr: 1670 T_IF T_LPAREN expr T_RPAREN { 1671 if1($3); 1672 clear_warning_flags(); 1673 } 1674 ; 1675 1676 switch_expr: 1677 T_SWITCH T_LPAREN expr T_RPAREN { 1678 switch1($3); 1679 clear_warning_flags(); 1680 } 1681 ; 1682 1683 association: 1684 type_name T_COLON expr 1685 | T_DEFAULT T_COLON expr 1686 ; 1687 1688 association_list: 1689 association 1690 | association_list T_COMMA association 1691 ; 1692 1693 generic_expr: 1694 T_GENERIC T_LPAREN expr T_COMMA association_list T_RPAREN { 1695 $$ = $3; 1696 } 1697 ; 1698 1699 do_statement: 1700 do statement { 1701 clear_warning_flags(); 1702 } 1703 ; 1704 1705 iteration_statement: /* C99 6.8.5 */ 1706 while_expr statement { 1707 clear_warning_flags(); 1708 while2(); 1709 } 1710 | while_expr error { 1711 clear_warning_flags(); 1712 while2(); 1713 } 1714 | do_statement do_while_expr { 1715 do2($2); 1716 seen_fallthrough = false; 1717 } 1718 | do error { 1719 clear_warning_flags(); 1720 do2(NULL); 1721 } 1722 | for_exprs statement { 1723 clear_warning_flags(); 1724 for2(); 1725 end_declaration_level(); 1726 block_level--; 1727 } 1728 | for_exprs error { 1729 clear_warning_flags(); 1730 for2(); 1731 end_declaration_level(); 1732 block_level--; 1733 } 1734 ; 1735 1736 while_expr: 1737 T_WHILE T_LPAREN expr T_RPAREN { 1738 while1($3); 1739 clear_warning_flags(); 1740 } 1741 ; 1742 1743 do: 1744 T_DO { 1745 do1(); 1746 } 1747 ; 1748 1749 do_while_expr: 1750 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1751 $$ = $3; 1752 } 1753 ; 1754 1755 for_start: 1756 T_FOR T_LPAREN { 1757 begin_declaration_level(AUTO); 1758 block_level++; 1759 } 1760 ; 1761 for_exprs: 1762 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1763 opt_expr T_SEMI opt_expr T_RPAREN { 1764 /* variable declaration in for loop */ 1765 c99ism(325); 1766 for1(NULL, $6, $8); 1767 clear_warning_flags(); 1768 } 1769 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1770 for1($2, $4, $6); 1771 clear_warning_flags(); 1772 } 1773 ; 1774 1775 opt_expr: 1776 /* empty */ { 1777 $$ = NULL; 1778 } 1779 | expr { 1780 $$ = $1; 1781 } 1782 ; 1783 1784 jump_statement: /* C99 6.8.6 */ 1785 goto identifier T_SEMI { 1786 do_goto(getsym($2)); 1787 } 1788 | goto error T_SEMI { 1789 symtyp = FVFT; 1790 } 1791 | T_CONTINUE T_SEMI { 1792 do_continue(); 1793 } 1794 | T_BREAK T_SEMI { 1795 do_break(); 1796 } 1797 | T_RETURN T_SEMI { 1798 do_return(NULL); 1799 } 1800 | T_RETURN expr T_SEMI { 1801 do_return($2); 1802 } 1803 ; 1804 1805 goto: 1806 T_GOTO { 1807 symtyp = FLABEL; 1808 } 1809 ; 1810 1811 asm_statement: 1812 T_ASM T_LPAREN read_until_rparen T_SEMI { 1813 setasm(); 1814 } 1815 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1816 setasm(); 1817 } 1818 | T_ASM error 1819 ; 1820 1821 read_until_rparen: 1822 /* empty */ { 1823 ignore_up_to_rparen(); 1824 } 1825 ; 1826 1827 declaration_list: 1828 declaration { 1829 clear_warning_flags(); 1830 } 1831 | declaration_list declaration { 1832 clear_warning_flags(); 1833 } 1834 ; 1835 1836 constant_expr: /* C99 6.6 */ 1837 expr %prec T_ASSIGN { 1838 $$ = $1; 1839 } 1840 ; 1841 1842 expr: 1843 expr T_ASTERISK expr { 1844 $$ = build(MULT, $1, $3); 1845 } 1846 | expr T_MULTIPLICATIVE expr { 1847 $$ = build($2, $1, $3); 1848 } 1849 | expr T_ADDITIVE expr { 1850 $$ = build($2, $1, $3); 1851 } 1852 | expr T_SHIFT expr { 1853 $$ = build($2, $1, $3); 1854 } 1855 | expr T_RELATIONAL expr { 1856 $$ = build($2, $1, $3); 1857 } 1858 | expr T_EQUALITY expr { 1859 $$ = build($2, $1, $3); 1860 } 1861 | expr T_AMPER expr { 1862 $$ = build(BITAND, $1, $3); 1863 } 1864 | expr T_BITXOR expr { 1865 $$ = build(BITXOR, $1, $3); 1866 } 1867 | expr T_BITOR expr { 1868 $$ = build(BITOR, $1, $3); 1869 } 1870 | expr T_LOGAND expr { 1871 $$ = build(LOGAND, $1, $3); 1872 } 1873 | expr T_LOGOR expr { 1874 $$ = build(LOGOR, $1, $3); 1875 } 1876 | expr T_QUEST expr T_COLON expr { 1877 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1878 } 1879 | expr T_ASSIGN expr { 1880 $$ = build(ASSIGN, $1, $3); 1881 } 1882 | expr T_OPASSIGN expr { 1883 $$ = build($2, $1, $3); 1884 } 1885 | expr T_COMMA expr { 1886 $$ = build(COMMA, $1, $3); 1887 } 1888 | term { 1889 $$ = $1; 1890 } 1891 | generic_expr { 1892 $$ = $1; 1893 } 1894 ; 1895 1896 term: 1897 T_NAME { 1898 /* XXX really necessary? */ 1899 if (yychar < 0) 1900 yychar = yylex(); 1901 $$ = new_name_node(getsym($1), yychar); 1902 } 1903 | string { 1904 $$ = new_string_node($1); 1905 } 1906 | T_CON { 1907 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1908 } 1909 | T_LPAREN expr T_RPAREN { 1910 if ($2 != NULL) 1911 $2->tn_parenthesized = true; 1912 $$ = $2; 1913 } 1914 | T_LPAREN compound_statement_lbrace declaration_list 1915 expr_statement_list { 1916 block_level--; 1917 mem_block_level--; 1918 begin_initialization(mktempsym(dup_type($4->tn_type))); 1919 mem_block_level++; 1920 block_level++; 1921 /* ({ }) is a GCC extension */ 1922 gnuism(320); 1923 } compound_statement_rbrace T_RPAREN { 1924 $$ = new_name_node(*current_initsym(), 0); 1925 end_initialization(); 1926 } 1927 | T_LPAREN compound_statement_lbrace expr_statement_list { 1928 block_level--; 1929 mem_block_level--; 1930 begin_initialization(mktempsym($3->tn_type)); 1931 mem_block_level++; 1932 block_level++; 1933 /* ({ }) is a GCC extension */ 1934 gnuism(320); 1935 } compound_statement_rbrace T_RPAREN { 1936 $$ = new_name_node(*current_initsym(), 0); 1937 end_initialization(); 1938 } 1939 | term T_INCDEC { 1940 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1941 } 1942 | T_INCDEC term { 1943 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1944 } 1945 | T_ASTERISK term { 1946 $$ = build(INDIR, $2, NULL); 1947 } 1948 | T_AMPER term { 1949 $$ = build(ADDR, $2, NULL); 1950 } 1951 | T_UNARY term { 1952 $$ = build($1, $2, NULL); 1953 } 1954 | T_ADDITIVE term { 1955 if (tflag && $1 == PLUS) { 1956 /* unary + is illegal in traditional C */ 1957 warning(100); 1958 } 1959 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1960 } 1961 | term T_LBRACK expr T_RBRACK { 1962 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1963 } 1964 | term T_LPAREN T_RPAREN { 1965 $$ = new_function_call_node($1, NULL); 1966 } 1967 | term T_LPAREN func_arg_list T_RPAREN { 1968 $$ = new_function_call_node($1, $3); 1969 } 1970 | term point_or_arrow T_NAME { 1971 if ($1 != NULL) { 1972 sym_t *msym; 1973 /* 1974 * XXX struct_or_union_member should be integrated 1975 * in build() 1976 */ 1977 if ($2 == ARROW) { 1978 /* 1979 * must do this before struct_or_union_member 1980 * is called 1981 */ 1982 $1 = cconv($1); 1983 } 1984 msym = struct_or_union_member($1, $2, getsym($3)); 1985 $$ = build($2, $1, new_name_node(msym, 0)); 1986 } else { 1987 $$ = NULL; 1988 } 1989 } 1990 | T_REAL term { 1991 $$ = build(REAL, $2, NULL); 1992 } 1993 | T_IMAG term { 1994 $$ = build(IMAG, $2, NULL); 1995 } 1996 | T_EXTENSION term { 1997 $$ = $2; 1998 } 1999 | T_REAL T_LPAREN term T_RPAREN { 2000 $$ = build(REAL, $3, NULL); 2001 } 2002 | T_IMAG T_LPAREN term T_RPAREN { 2003 $$ = build(IMAG, $3, NULL); 2004 } 2005 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 2006 symtyp = FMEMBER; 2007 $$ = build_offsetof($3, getsym($5)); 2008 } 2009 | T_SIZEOF term { 2010 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 2011 if ($$ != NULL) 2012 check_expr_misc($2, false, false, false, false, false, true); 2013 } 2014 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 2015 $$ = build_sizeof($3); 2016 } 2017 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 2018 $$ = build_alignof($3); 2019 } 2020 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 2021 $$ = cast($4, $2); 2022 } 2023 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 2024 sym_t *tmp = mktempsym($2); 2025 begin_initialization(tmp); 2026 cgram_declare(tmp, true, NULL); 2027 } init_lbrace initializer_list comma_opt init_rbrace { 2028 if (!Sflag) 2029 /* compound literals are a C9X/GCC extension */ 2030 gnuism(319); 2031 $$ = new_name_node(*current_initsym(), 0); 2032 end_initialization(); 2033 } 2034 ; 2035 2036 string: 2037 T_STRING { 2038 $$ = $1; 2039 } 2040 | T_STRING string2 { 2041 $$ = cat_strings($1, $2); 2042 } 2043 ; 2044 2045 string2: 2046 T_STRING { 2047 if (tflag) { 2048 /* concatenated strings are illegal in traditional C */ 2049 warning(219); 2050 } 2051 $$ = $1; 2052 } 2053 | string2 T_STRING { 2054 $$ = cat_strings($1, $2); 2055 } 2056 ; 2057 2058 func_arg_list: 2059 expr %prec T_COMMA { 2060 $$ = new_function_argument_node(NULL, $1); 2061 } 2062 | func_arg_list T_COMMA expr { 2063 $$ = new_function_argument_node($1, $3); 2064 } 2065 ; 2066 2067 point_or_arrow: 2068 T_MEMBACC { 2069 symtyp = FMEMBER; 2070 $$ = $1; 2071 } 2072 ; 2073 2074 point: 2075 T_MEMBACC { 2076 if ($1 != POINT) { 2077 /* syntax error '%s' */ 2078 error(249, yytext); 2079 } 2080 } 2081 ; 2082 2083 identifier: /* C99 6.4.2.1 */ 2084 T_NAME { 2085 $$ = $1; 2086 cgram_debug("name '%s'", $$->sb_name); 2087 } 2088 | T_TYPENAME { 2089 $$ = $1; 2090 cgram_debug("typename '%s'", $$->sb_name); 2091 } 2092 ; 2093 2094 comma_opt: 2095 T_COMMA 2096 | /* empty */ 2097 ; 2098 %% 2099 2100 /* ARGSUSED */ 2101 int 2102 yyerror(const char *msg) 2103 { 2104 /* syntax error '%s' */ 2105 error(249, yytext); 2106 if (++sytxerr >= 5) 2107 norecover(); 2108 return 0; 2109 } 2110 2111 static void 2112 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2113 { 2114 declare(decl, initflg, renaming); 2115 if (renaming != NULL) 2116 freeyyv(&renaming, T_NAME); 2117 } 2118 2119 /* 2120 * Discard all input tokens up to and including the next 2121 * unmatched right paren 2122 */ 2123 static void 2124 ignore_up_to_rparen(void) 2125 { 2126 int level; 2127 2128 if (yychar < 0) 2129 yychar = yylex(); 2130 freeyyv(&yylval, yychar); 2131 2132 level = 1; 2133 while (yychar != T_RPAREN || --level > 0) { 2134 if (yychar == T_LPAREN) { 2135 level++; 2136 } else if (yychar <= 0) { 2137 break; 2138 } 2139 freeyyv(&yylval, yychar = yylex()); 2140 } 2141 2142 yyclearin; 2143 } 2144 2145 static sym_t * 2146 symbolrename(sym_t *s, sbuf_t *sb) 2147 { 2148 if (sb) 2149 s->s_rename = sb->sb_name; 2150 return s; 2151 } 2152
Indexes created Thu Oct 02 14:10:14 GMT 2025