cgram.y revision 1.231
1 %{ 2 /* $NetBSD: cgram.y,v 1.231 2021/06/27 08:20:50 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 1.231 2021/06/27 08:20:50 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 != NULL; s = s->s_next) 122 s->s_styp = NULL; 123 } 124 %} 125 126 %expect 182 127 128 %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 bool y_seen_statement; 142 }; 143 144 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 145 %token T_POINT T_ARROW 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_COMMON 219 %token <y_type> T_AT_CONSTRUCTOR 220 %token <y_type> T_AT_DEPRECATED 221 %token <y_type> T_AT_DESTRUCTOR 222 %token <y_type> T_AT_FALLTHROUGH 223 %token <y_type> T_AT_FORMAT 224 %token <y_type> T_AT_FORMAT_ARG 225 %token <y_type> T_AT_FORMAT_GNU_PRINTF 226 %token <y_type> T_AT_FORMAT_PRINTF 227 %token <y_type> T_AT_FORMAT_SCANF 228 %token <y_type> T_AT_FORMAT_STRFMON 229 %token <y_type> T_AT_FORMAT_STRFTIME 230 %token <y_type> T_AT_FORMAT_SYSLOG 231 %token <y_type> T_AT_GNU_INLINE 232 %token <y_type> T_AT_MALLOC 233 %token <y_type> T_AT_MAY_ALIAS 234 %token <y_type> T_AT_MINBYTES 235 %token <y_type> T_AT_MODE 236 %token <y_type> T_AT_NOINLINE 237 %token <y_type> T_AT_NONNULL 238 %token <y_type> T_AT_NONSTRING 239 %token <y_type> T_AT_NORETURN 240 %token <y_type> T_AT_NOTHROW 241 %token <y_type> T_AT_NO_INSTRUMENT_FUNCTION 242 %token <y_type> T_AT_OPTIMIZE 243 %token <y_type> T_AT_PACKED 244 %token <y_type> T_AT_PCS 245 %token <y_type> T_AT_PURE 246 %token <y_type> T_AT_RETURNS_TWICE 247 %token <y_type> T_AT_SECTION 248 %token <y_type> T_AT_SENTINEL 249 %token <y_type> T_AT_STRING 250 %token <y_type> T_AT_TLS_MODEL 251 %token <y_type> T_AT_TUNION 252 %token <y_type> T_AT_UNUSED 253 %token <y_type> T_AT_USED 254 %token <y_type> T_AT_VISIBILITY 255 %token <y_type> T_AT_WARN_UNUSED_RESULT 256 %token <y_type> T_AT_WEAK 257 258 %left T_COMMA 259 %right T_ASSIGN T_OPASSIGN 260 %right T_QUEST T_COLON 261 %left T_LOGOR 262 %left T_LOGAND 263 %left T_BITOR 264 %left T_BITXOR 265 %left T_AMPER 266 %left T_EQUALITY 267 %left T_RELATIONAL 268 %left T_SHIFT 269 %left T_ADDITIVE 270 %left T_ASTERISK T_MULTIPLICATIVE 271 %right T_UNARY T_INCDEC T_SIZEOF T_REAL T_IMAG 272 %left T_LPAREN T_LBRACK T_POINT T_ARROW 273 274 %token <y_sb> T_NAME 275 %token <y_sb> T_TYPENAME 276 %token <y_val> T_CON 277 %token <y_string> T_STRING 278 279 %type <y_sym> func_decl 280 %type <y_sym> notype_decl 281 %type <y_sym> type_decl 282 %type <y_type> typespec 283 %type <y_type> clrtyp_typespec 284 %type <y_type> notype_typespec 285 %type <y_type> struct_spec 286 %type <y_type> enum_spec 287 %type <y_type> type_attribute 288 %type <y_sym> struct_tag 289 %type <y_sym> enum_tag 290 %type <y_tspec> struct 291 %type <y_sym> struct_declaration 292 %type <y_sb> identifier 293 %type <y_sym> member_declaration_list_with_rbrace 294 %type <y_sym> member_declaration_list 295 %type <y_sym> member_declaration 296 %type <y_sym> notype_member_decls 297 %type <y_sym> type_member_decls 298 %type <y_sym> notype_member_decl 299 %type <y_sym> type_member_decl 300 %type <y_tnode> constant_expr 301 %type <y_tnode> array_size 302 %type <y_sym> enum_declaration 303 %type <y_sym> enums_with_opt_comma 304 %type <y_sym> enums 305 %type <y_sym> enumerator 306 %type <y_sym> enumeration_constant 307 %type <y_sym> notype_direct_decl 308 %type <y_sym> type_direct_decl 309 %type <y_pqinf> pointer 310 %type <y_pqinf> asterisk 311 %type <y_sym> param_decl 312 %type <y_sym> param_list 313 %type <y_sym> abstract_decl_param_list 314 %type <y_sym> direct_param_decl 315 %type <y_sym> notype_param_decl 316 %type <y_sym> direct_notype_param_decl 317 %type <y_pqinf> type_qualifier_list 318 %type <y_pqinf> type_qualifier 319 %type <y_sym> identifier_list 320 %type <y_sym> abstract_decl 321 %type <y_sym> direct_abstract_decl 322 %type <y_sym> vararg_parameter_type_list 323 %type <y_sym> parameter_type_list 324 %type <y_sym> parameter_declaration 325 %type <y_tnode> expr 326 %type <y_tnode> gcc_statement_expr_list 327 %type <y_tnode> gcc_statement_expr_item 328 %type <y_tnode> term 329 %type <y_tnode> generic_expr 330 %type <y_tnode> func_arg_list 331 %type <y_op> point_or_arrow 332 %type <y_type> type_name 333 %type <y_sym> abstract_declaration 334 %type <y_tnode> do_while_expr 335 %type <y_tnode> opt_expr 336 %type <y_string> string 337 %type <y_string> string2 338 %type <y_sb> opt_asm_or_symbolrename 339 %type <y_range> range 340 %type <y_seen_statement> block_item_list 341 %type <y_seen_statement> block_item 342 343 344 %% 345 346 program: 347 /* empty */ { 348 if (sflag) { 349 /* empty translation unit */ 350 error(272); 351 } else if (!tflag) { 352 /* empty translation unit */ 353 warning(272); 354 } 355 } 356 | translation_unit 357 ; 358 359 translation_unit: /* C99 6.9 */ 360 external_declaration 361 | translation_unit external_declaration 362 ; 363 364 external_declaration: /* C99 6.9 */ 365 asm_statement 366 | function_definition { 367 global_clean_up_decl(false); 368 clear_warning_flags(); 369 } 370 | top_level_declaration { 371 global_clean_up_decl(false); 372 clear_warning_flags(); 373 } 374 ; 375 376 /* 377 * On the top level, lint allows several forms of declarations that it doesn't 378 * allow in functions. For example, a single ';' is an empty declaration and 379 * is supported by some compilers, but in a function it would be an empty 380 * statement, not a declaration. This makes a difference in C90 mode, where 381 * a statement must not be followed by a declaration. 382 * 383 * See 'declaration' for all other declarations. 384 */ 385 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 386 T_SEMI { 387 if (sflag) { 388 /* empty declaration */ 389 error(0); 390 } else if (!tflag) { 391 /* empty declaration */ 392 warning(0); 393 } 394 } 395 | clrtyp deftyp notype_init_decls T_SEMI { 396 if (sflag) { 397 /* old style declaration; add 'int' */ 398 error(1); 399 } else if (!tflag) { 400 /* old style declaration; add 'int' */ 401 warning(1); 402 } 403 } 404 | declmods deftyp T_SEMI { 405 if (dcs->d_scl == TYPEDEF) { 406 /* typedef declares no type name */ 407 warning(72); 408 } else { 409 /* empty declaration */ 410 warning(2); 411 } 412 } 413 | declmods deftyp notype_init_decls T_SEMI 414 | declaration_specifiers deftyp T_SEMI { 415 if (dcs->d_scl == TYPEDEF) { 416 /* typedef declares no type name */ 417 warning(72); 418 } else if (!dcs->d_nonempty_decl) { 419 /* empty declaration */ 420 warning(2); 421 } 422 } 423 | declaration_specifiers deftyp type_init_decls T_SEMI 424 | error T_SEMI { 425 global_clean_up(); 426 } 427 | error T_RBRACE { 428 global_clean_up(); 429 } 430 ; 431 432 function_definition: /* C99 6.9.1 */ 433 func_decl { 434 if ($1->s_type->t_tspec != FUNC) { 435 /* syntax error '%s' */ 436 error(249, yytext); 437 YYERROR; 438 } 439 if ($1->s_type->t_typedef) { 440 /* ()-less function definition */ 441 error(64); 442 YYERROR; 443 } 444 funcdef($1); 445 block_level++; 446 begin_declaration_level(ARG); 447 if (lwarn == LWARN_NONE) 448 $1->s_used = true; 449 } arg_declaration_list_opt { 450 end_declaration_level(); 451 block_level--; 452 check_func_lint_directives(); 453 check_func_old_style_arguments(); 454 begin_control_statement(CS_FUNCTION_BODY); 455 } compound_statement { 456 funcend(); 457 end_control_statement(CS_FUNCTION_BODY); 458 } 459 ; 460 461 func_decl: 462 clrtyp deftyp notype_decl { 463 $$ = $3; 464 } 465 | declmods deftyp notype_decl { 466 $$ = $3; 467 } 468 | declaration_specifiers deftyp type_decl { 469 $$ = $3; 470 } 471 ; 472 473 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 474 /* empty */ 475 | arg_declaration_list 476 ; 477 478 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 479 arg_declaration 480 | arg_declaration_list arg_declaration 481 /* XXX or better "arg_declaration error" ? */ 482 | error 483 ; 484 485 /* 486 * "arg_declaration" is separated from "declaration" because it 487 * needs other error handling. 488 */ 489 arg_declaration: 490 declmods deftyp T_SEMI { 491 /* empty declaration */ 492 warning(2); 493 } 494 | declmods deftyp notype_init_decls T_SEMI 495 | declaration_specifiers deftyp T_SEMI { 496 if (!dcs->d_nonempty_decl) { 497 /* empty declaration */ 498 warning(2); 499 } else { 500 /* '%s' declared in argument declaration list */ 501 warning(3, type_name(dcs->d_type)); 502 } 503 } 504 | declaration_specifiers deftyp type_init_decls T_SEMI { 505 if (dcs->d_nonempty_decl) { 506 /* '%s' declared in argument declaration list */ 507 warning(3, type_name(dcs->d_type)); 508 } 509 } 510 | declmods error 511 | declaration_specifiers error 512 ; 513 514 declaration: /* C99 6.7 */ 515 declmods deftyp T_SEMI { 516 if (dcs->d_scl == TYPEDEF) { 517 /* typedef declares no type name */ 518 warning(72); 519 } else { 520 /* empty declaration */ 521 warning(2); 522 } 523 } 524 | declmods deftyp notype_init_decls T_SEMI 525 | declaration_specifiers deftyp T_SEMI { 526 if (dcs->d_scl == TYPEDEF) { 527 /* typedef declares no type name */ 528 warning(72); 529 } else if (!dcs->d_nonempty_decl) { 530 /* empty declaration */ 531 warning(2); 532 } 533 } 534 | declaration_specifiers deftyp type_init_decls T_SEMI 535 | error T_SEMI 536 ; 537 538 type_attribute_format_type: 539 T_AT_FORMAT_GNU_PRINTF 540 | T_AT_FORMAT_PRINTF 541 | T_AT_FORMAT_SCANF 542 | T_AT_FORMAT_STRFMON 543 | T_AT_FORMAT_STRFTIME 544 | T_AT_FORMAT_SYSLOG 545 ; 546 547 type_attribute_bounded_type: 548 T_AT_MINBYTES 549 | T_AT_STRING 550 | T_AT_BUFFER 551 ; 552 553 554 type_attribute_spec: 555 /* empty */ 556 | T_AT_ALWAYS_INLINE 557 | T_AT_ALIAS T_LPAREN string T_RPAREN 558 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 559 | T_AT_ALIGNED 560 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 561 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 562 | T_AT_BOUNDED T_LPAREN type_attribute_bounded_type 563 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 564 | T_AT_COLD 565 | T_AT_COMMON 566 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 567 | T_AT_CONSTRUCTOR 568 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 569 | T_AT_DEPRECATED 570 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 571 | T_AT_DESTRUCTOR 572 | T_AT_FALLTHROUGH { 573 fallthru(1); 574 } 575 | T_AT_FORMAT T_LPAREN type_attribute_format_type T_COMMA 576 constant_expr T_COMMA constant_expr T_RPAREN 577 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 578 | T_AT_GNU_INLINE 579 | T_AT_MALLOC 580 | T_AT_MAY_ALIAS 581 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 582 | T_AT_NOINLINE 583 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 584 | T_AT_NONNULL 585 | T_AT_NONSTRING 586 | T_AT_NORETURN 587 | T_AT_NOTHROW 588 | T_AT_NO_INSTRUMENT_FUNCTION 589 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 590 | T_AT_PACKED { 591 addpacked(); 592 } 593 | T_AT_PCS T_LPAREN string T_RPAREN 594 | T_AT_PURE 595 | T_AT_RETURNS_TWICE 596 | T_AT_SECTION T_LPAREN string T_RPAREN 597 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 598 | T_AT_SENTINEL 599 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 600 | T_AT_TUNION 601 | T_AT_UNUSED { 602 add_attr_used(); 603 } 604 | T_AT_USED { 605 add_attr_used(); 606 } 607 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 608 | T_AT_WARN_UNUSED_RESULT 609 | T_AT_WEAK 610 | T_QUAL { 611 if ($1 != CONST) 612 yyerror("Bad attribute"); 613 } 614 ; 615 616 type_attribute_spec_list: 617 type_attribute_spec 618 | type_attribute_spec_list T_COMMA type_attribute_spec 619 ; 620 621 align_as: 622 typespec 623 | constant_expr 624 ; 625 626 type_attribute: 627 T_ATTRIBUTE T_LPAREN T_LPAREN { 628 attron = true; 629 } type_attribute_spec_list { 630 attron = false; 631 } T_RPAREN T_RPAREN 632 | T_ALIGNAS T_LPAREN align_as T_RPAREN { 633 } 634 | T_PACKED { 635 addpacked(); 636 } 637 | T_NORETURN { 638 } 639 ; 640 641 type_attribute_list: 642 type_attribute 643 | type_attribute_list type_attribute 644 ; 645 646 clrtyp: 647 /* empty */ { 648 clrtyp(); 649 } 650 ; 651 652 deftyp: 653 /* empty */ { 654 deftyp(); 655 } 656 ; 657 658 declaration_specifiers: /* C99 6.7 */ 659 clrtyp_typespec { 660 add_type($1); 661 } 662 | declmods typespec { 663 add_type($2); 664 } 665 | type_attribute declaration_specifiers 666 | declaration_specifiers declmod 667 | declaration_specifiers notype_typespec { 668 add_type($2); 669 } 670 ; 671 672 declmods: 673 clrtyp T_QUAL { 674 add_qualifier($2); 675 } 676 | clrtyp T_SCLASS { 677 add_storage_class($2); 678 } 679 | declmods declmod 680 ; 681 682 declmod: 683 T_QUAL { 684 add_qualifier($1); 685 } 686 | T_SCLASS { 687 add_storage_class($1); 688 } 689 | type_attribute_list 690 ; 691 692 clrtyp_typespec: 693 clrtyp notype_typespec { 694 $$ = $2; 695 } 696 | T_TYPENAME clrtyp { 697 $$ = getsym($1)->s_type; 698 } 699 ; 700 701 typespec: 702 notype_typespec { 703 $$ = $1; 704 } 705 | T_TYPENAME { 706 $$ = getsym($1)->s_type; 707 } 708 ; 709 710 notype_typespec: 711 T_TYPE { 712 $$ = gettyp($1); 713 } 714 | T_TYPEOF term { 715 $$ = $2->tn_type; 716 } 717 | struct_spec { 718 end_declaration_level(); 719 $$ = $1; 720 } 721 | enum_spec { 722 end_declaration_level(); 723 $$ = $1; 724 } 725 ; 726 727 struct_spec: 728 struct struct_tag { 729 /* 730 * STDC requires that "struct a;" always introduces 731 * a new tag if "a" is not declared at current level 732 * 733 * yychar is valid because otherwise the parser would not 734 * have been able to decide if it must shift or reduce 735 */ 736 $$ = mktag($2, $1, false, yychar == T_SEMI); 737 } 738 | struct struct_tag { 739 dcs->d_tagtyp = mktag($2, $1, true, false); 740 } struct_declaration { 741 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 742 } 743 | struct { 744 dcs->d_tagtyp = mktag(NULL, $1, true, false); 745 } struct_declaration { 746 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 747 } 748 | struct error { 749 symtyp = FVFT; 750 $$ = gettyp(INT); 751 } 752 ; 753 754 struct: 755 struct type_attribute 756 | T_STRUCT_OR_UNION { 757 symtyp = FTAG; 758 begin_declaration_level($1 == STRUCT ? MOS : MOU); 759 dcs->d_offset = 0; 760 dcs->d_stralign = CHAR_SIZE; 761 $$ = $1; 762 } 763 ; 764 765 struct_tag: 766 identifier { 767 $$ = getsym($1); 768 } 769 ; 770 771 struct_declaration: 772 struct_decl_lbrace member_declaration_list_with_rbrace { 773 $$ = $2; 774 } 775 ; 776 777 struct_decl_lbrace: 778 T_LBRACE { 779 symtyp = FVFT; 780 } 781 ; 782 783 member_declaration_list_with_rbrace: 784 member_declaration_list T_SEMI T_RBRACE { 785 $$ = $1; 786 } 787 | member_declaration_list T_RBRACE { 788 if (sflag) { 789 /* syntax req. ';' after last struct/union member */ 790 error(66); 791 } else { 792 /* syntax req. ';' after last struct/union member */ 793 warning(66); 794 } 795 $$ = $1; 796 } 797 | T_RBRACE { 798 $$ = NULL; 799 } 800 ; 801 802 opt_type_attribute: 803 /* empty */ 804 | type_attribute 805 ; 806 807 member_declaration_list: 808 member_declaration { 809 $$ = $1; 810 } 811 | member_declaration_list T_SEMI member_declaration { 812 $$ = lnklst($1, $3); 813 } 814 ; 815 816 member_declaration: 817 noclass_declmods deftyp { 818 /* too late, i know, but getsym() compensates it */ 819 symtyp = FMEMBER; 820 } notype_member_decls opt_type_attribute { 821 symtyp = FVFT; 822 $$ = $4; 823 } 824 | noclass_declspecs deftyp { 825 symtyp = FMEMBER; 826 } type_member_decls opt_type_attribute { 827 symtyp = FVFT; 828 $$ = $4; 829 } 830 | noclass_declmods deftyp opt_type_attribute { 831 symtyp = FVFT; 832 /* struct or union member must be named */ 833 if (!Sflag) 834 /* anonymous struct/union members is a C9X feature */ 835 warning(49); 836 /* add all the members of the anonymous struct/union */ 837 $$ = dcs->d_type->t_str->sou_first_member; 838 anonymize($$); 839 } 840 | noclass_declspecs deftyp opt_type_attribute { 841 symtyp = FVFT; 842 /* struct or union member must be named */ 843 if (!Sflag) 844 /* anonymous struct/union members is a C9X feature */ 845 warning(49); 846 if (is_struct_or_union(dcs->d_type->t_tspec)) { 847 $$ = dcs->d_type->t_str->sou_first_member; 848 /* add all the members of the anonymous struct/union */ 849 anonymize($$); 850 } else { 851 /* syntax error '%s' */ 852 error(249, "unnamed member"); 853 } 854 } 855 | error { 856 symtyp = FVFT; 857 $$ = NULL; 858 } 859 ; 860 861 noclass_declspecs: 862 clrtyp_typespec { 863 add_type($1); 864 } 865 | type_attribute noclass_declspecs 866 | noclass_declmods typespec { 867 add_type($2); 868 } 869 | noclass_declspecs T_QUAL { 870 add_qualifier($2); 871 } 872 | noclass_declspecs notype_typespec { 873 add_type($2); 874 } 875 | noclass_declspecs type_attribute 876 ; 877 878 noclass_declmods: 879 clrtyp T_QUAL { 880 add_qualifier($2); 881 } 882 | noclass_declmods T_QUAL { 883 add_qualifier($2); 884 } 885 ; 886 887 notype_member_decls: 888 notype_member_decl { 889 $$ = declarator_1_struct_union($1); 890 } 891 | notype_member_decls { 892 symtyp = FMEMBER; 893 } T_COMMA type_member_decl { 894 $$ = lnklst($1, declarator_1_struct_union($4)); 895 } 896 ; 897 898 type_member_decls: 899 type_member_decl { 900 $$ = declarator_1_struct_union($1); 901 } 902 | type_member_decls { 903 symtyp = FMEMBER; 904 } T_COMMA type_member_decl { 905 $$ = lnklst($1, declarator_1_struct_union($4)); 906 } 907 ; 908 909 notype_member_decl: 910 notype_decl { 911 $$ = $1; 912 } 913 | notype_decl T_COLON constant_expr { /* C99 6.7.2.1 */ 914 $$ = bitfield($1, to_int_constant($3, true)); 915 } 916 | { 917 symtyp = FVFT; 918 } T_COLON constant_expr { /* C99 6.7.2.1 */ 919 $$ = bitfield(NULL, to_int_constant($3, true)); 920 } 921 ; 922 923 type_member_decl: 924 type_decl { 925 $$ = $1; 926 } 927 | type_decl T_COLON constant_expr { 928 $$ = bitfield($1, to_int_constant($3, true)); 929 } 930 | { 931 symtyp = FVFT; 932 } T_COLON constant_expr { 933 $$ = bitfield(NULL, to_int_constant($3, true)); 934 } 935 ; 936 937 enum_spec: 938 enum enum_tag { 939 $$ = mktag($2, ENUM, false, false); 940 } 941 | enum enum_tag { 942 dcs->d_tagtyp = mktag($2, ENUM, true, false); 943 } enum_declaration { 944 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 945 } 946 | enum { 947 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 948 } enum_declaration { 949 $$ = complete_tag_enum(dcs->d_tagtyp, $3); 950 } 951 | enum error { 952 symtyp = FVFT; 953 $$ = gettyp(INT); 954 } 955 ; 956 957 enum: 958 T_ENUM { 959 symtyp = FTAG; 960 begin_declaration_level(CTCONST); 961 } 962 ; 963 964 enum_tag: 965 identifier { 966 $$ = getsym($1); 967 } 968 ; 969 970 enum_declaration: 971 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 972 $$ = $2; 973 } 974 ; 975 976 enum_decl_lbrace: 977 T_LBRACE { 978 symtyp = FVFT; 979 enumval = 0; 980 } 981 ; 982 983 enums_with_opt_comma: 984 enums { 985 $$ = $1; 986 } 987 | enums T_COMMA { 988 if (sflag) { 989 /* trailing ',' prohibited in enum declaration */ 990 error(54); 991 } else { 992 /* trailing ',' prohibited in enum declaration */ 993 c99ism(54); 994 } 995 $$ = $1; 996 } 997 ; 998 999 enums: 1000 enumerator { 1001 $$ = $1; 1002 } 1003 | enums T_COMMA enumerator { 1004 $$ = lnklst($1, $3); 1005 } 1006 | error { 1007 $$ = NULL; 1008 } 1009 ; 1010 1011 enumerator: 1012 enumeration_constant { 1013 $$ = enumeration_constant($1, enumval, true); 1014 } 1015 | enumeration_constant T_ASSIGN constant_expr { 1016 $$ = enumeration_constant($1, to_int_constant($3, true), false); 1017 } 1018 ; 1019 1020 enumeration_constant: /* C99 6.4.4.3 */ 1021 identifier { 1022 $$ = getsym($1); 1023 } 1024 ; 1025 1026 1027 notype_init_decls: 1028 notype_init_decl 1029 | notype_init_decls T_COMMA type_init_decl 1030 ; 1031 1032 type_init_decls: 1033 type_init_decl 1034 | type_init_decls T_COMMA type_init_decl 1035 ; 1036 1037 notype_init_decl: 1038 notype_decl opt_asm_or_symbolrename { 1039 cgram_declare($1, false, $2); 1040 check_size($1); 1041 } 1042 | notype_decl opt_asm_or_symbolrename { 1043 begin_initialization($1); 1044 cgram_declare($1, true, $2); 1045 } T_ASSIGN initializer { 1046 check_size($1); 1047 end_initialization(); 1048 } 1049 ; 1050 1051 type_init_decl: 1052 type_decl opt_asm_or_symbolrename { 1053 cgram_declare($1, false, $2); 1054 check_size($1); 1055 } 1056 | type_decl opt_asm_or_symbolrename { 1057 begin_initialization($1); 1058 cgram_declare($1, true, $2); 1059 } T_ASSIGN initializer { 1060 check_size($1); 1061 end_initialization(); 1062 } 1063 ; 1064 1065 notype_decl: 1066 notype_direct_decl { 1067 $$ = $1; 1068 } 1069 | pointer notype_direct_decl { 1070 $$ = add_pointer($2, $1); 1071 } 1072 ; 1073 1074 notype_direct_decl: 1075 T_NAME { 1076 $$ = declarator_name(getsym($1)); 1077 } 1078 | T_LPAREN type_decl T_RPAREN { 1079 $$ = $2; 1080 } 1081 | type_attribute notype_direct_decl { 1082 $$ = $2; 1083 } 1084 | notype_direct_decl T_LBRACK T_RBRACK { 1085 $$ = add_array($1, false, 0); 1086 } 1087 | notype_direct_decl T_LBRACK array_size T_RBRACK { 1088 $$ = add_array($1, true, to_int_constant($3, false)); 1089 } 1090 | notype_direct_decl param_list opt_asm_or_symbolrename { 1091 $$ = add_function(symbolrename($1, $3), $2); 1092 end_declaration_level(); 1093 block_level--; 1094 } 1095 | notype_direct_decl type_attribute_list 1096 ; 1097 1098 type_decl: 1099 type_direct_decl { 1100 $$ = $1; 1101 } 1102 | pointer type_direct_decl { 1103 $$ = add_pointer($2, $1); 1104 } 1105 ; 1106 1107 type_direct_decl: 1108 identifier { 1109 $$ = declarator_name(getsym($1)); 1110 } 1111 | T_LPAREN type_decl T_RPAREN { 1112 $$ = $2; 1113 } 1114 | type_attribute type_direct_decl { 1115 $$ = $2; 1116 } 1117 | type_direct_decl T_LBRACK T_RBRACK { 1118 $$ = add_array($1, false, 0); 1119 } 1120 | type_direct_decl T_LBRACK array_size T_RBRACK { 1121 $$ = add_array($1, true, to_int_constant($3, false)); 1122 } 1123 | type_direct_decl param_list opt_asm_or_symbolrename { 1124 $$ = add_function(symbolrename($1, $3), $2); 1125 end_declaration_level(); 1126 block_level--; 1127 } 1128 | type_direct_decl type_attribute_list 1129 ; 1130 1131 /* 1132 * param_decl and notype_param_decl exist to avoid a conflict in 1133 * argument lists. A typename enclosed in parens should always be 1134 * treated as a typename, not an argument. 1135 * "typedef int a; f(int (a));" is "typedef int a; f(int foo(a));" 1136 * not "typedef int a; f(int a);" 1137 */ 1138 param_decl: 1139 direct_param_decl { 1140 $$ = $1; 1141 } 1142 | pointer direct_param_decl { 1143 $$ = add_pointer($2, $1); 1144 } 1145 ; 1146 1147 opt_type_qualifier_list: 1148 /* empty */ 1149 | type_qualifier_list 1150 ; 1151 1152 array_size: 1153 opt_type_qualifier_list T_SCLASS constant_expr { 1154 /* C11 6.7.6.3p7 */ 1155 if ($2 != STATIC) 1156 yyerror("Bad attribute"); 1157 /* static array size is a C11 extension */ 1158 c11ism(343); 1159 $$ = $3; 1160 } 1161 | constant_expr { 1162 $$ = $1; 1163 } 1164 ; 1165 1166 direct_param_decl: 1167 identifier type_attribute_list { 1168 $$ = declarator_name(getsym($1)); 1169 } 1170 | identifier { 1171 $$ = declarator_name(getsym($1)); 1172 } 1173 | T_LPAREN notype_param_decl T_RPAREN { 1174 $$ = $2; 1175 } 1176 | direct_param_decl T_LBRACK T_RBRACK { 1177 $$ = add_array($1, false, 0); 1178 } 1179 | direct_param_decl T_LBRACK array_size T_RBRACK { 1180 $$ = add_array($1, true, to_int_constant($3, false)); 1181 } 1182 | direct_param_decl param_list opt_asm_or_symbolrename { 1183 $$ = add_function(symbolrename($1, $3), $2); 1184 end_declaration_level(); 1185 block_level--; 1186 } 1187 ; 1188 1189 notype_param_decl: 1190 direct_notype_param_decl { 1191 $$ = $1; 1192 } 1193 | pointer direct_notype_param_decl { 1194 $$ = add_pointer($2, $1); 1195 } 1196 ; 1197 1198 direct_notype_param_decl: 1199 identifier { 1200 $$ = declarator_name(getsym($1)); 1201 } 1202 | T_LPAREN notype_param_decl T_RPAREN { 1203 $$ = $2; 1204 } 1205 | direct_notype_param_decl T_LBRACK T_RBRACK { 1206 $$ = add_array($1, false, 0); 1207 } 1208 | direct_notype_param_decl T_LBRACK array_size T_RBRACK { 1209 $$ = add_array($1, true, to_int_constant($3, false)); 1210 } 1211 | direct_notype_param_decl param_list opt_asm_or_symbolrename { 1212 $$ = add_function(symbolrename($1, $3), $2); 1213 end_declaration_level(); 1214 block_level--; 1215 } 1216 ; 1217 1218 pointer: 1219 asterisk { 1220 $$ = $1; 1221 } 1222 | asterisk type_qualifier_list { 1223 $$ = merge_pointers_and_qualifiers($1, $2); 1224 } 1225 | asterisk pointer { 1226 $$ = merge_pointers_and_qualifiers($1, $2); 1227 } 1228 | asterisk type_qualifier_list pointer { 1229 $$ = merge_pointers_and_qualifiers($1, $2); 1230 $$ = merge_pointers_and_qualifiers($$, $3); 1231 } 1232 ; 1233 1234 asterisk: 1235 T_ASTERISK { 1236 $$ = xcalloc(1, sizeof(*$$)); 1237 $$->p_pointer = true; 1238 } 1239 ; 1240 1241 type_qualifier_list: 1242 type_qualifier { 1243 $$ = $1; 1244 } 1245 | type_qualifier_list type_qualifier { 1246 $$ = merge_pointers_and_qualifiers($1, $2); 1247 } 1248 ; 1249 1250 type_qualifier: 1251 T_QUAL { 1252 $$ = xcalloc(1, sizeof(*$$)); 1253 if ($1 == CONST) { 1254 $$->p_const = true; 1255 } else if ($1 == VOLATILE) { 1256 $$->p_volatile = true; 1257 } else { 1258 lint_assert($1 == RESTRICT || $1 == THREAD); 1259 } 1260 } 1261 ; 1262 1263 param_list: 1264 id_list_lparen identifier_list T_RPAREN { 1265 $$ = $2; 1266 } 1267 | abstract_decl_param_list { 1268 $$ = $1; 1269 } 1270 ; 1271 1272 id_list_lparen: 1273 T_LPAREN { 1274 block_level++; 1275 begin_declaration_level(PROTO_ARG); 1276 } 1277 ; 1278 1279 identifier_list: 1280 T_NAME { 1281 $$ = old_style_function_name(getsym($1)); 1282 } 1283 | identifier_list T_COMMA T_NAME { 1284 $$ = lnklst($1, old_style_function_name(getsym($3))); 1285 } 1286 | identifier_list error { 1287 $$ = $1; 1288 } 1289 ; 1290 1291 abstract_decl_param_list: 1292 abstract_decl_lparen T_RPAREN opt_type_attribute { 1293 $$ = NULL; 1294 } 1295 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN opt_type_attribute { 1296 dcs->d_proto = true; 1297 $$ = $2; 1298 } 1299 | abstract_decl_lparen error T_RPAREN opt_type_attribute { 1300 $$ = NULL; 1301 } 1302 ; 1303 1304 abstract_decl_lparen: 1305 T_LPAREN { 1306 block_level++; 1307 begin_declaration_level(PROTO_ARG); 1308 } 1309 ; 1310 1311 vararg_parameter_type_list: 1312 parameter_type_list { 1313 $$ = $1; 1314 } 1315 | parameter_type_list T_COMMA T_ELLIPSIS { 1316 dcs->d_vararg = true; 1317 $$ = $1; 1318 } 1319 | T_ELLIPSIS { 1320 if (sflag) { 1321 /* ANSI C requires formal parameter before '...' */ 1322 error(84); 1323 } else if (!tflag) { 1324 /* ANSI C requires formal parameter before '...' */ 1325 warning(84); 1326 } 1327 dcs->d_vararg = true; 1328 $$ = NULL; 1329 } 1330 ; 1331 1332 parameter_type_list: 1333 parameter_declaration { 1334 $$ = $1; 1335 } 1336 | parameter_type_list T_COMMA parameter_declaration { 1337 $$ = lnklst($1, $3); 1338 } 1339 ; 1340 1341 parameter_declaration: 1342 declmods deftyp { 1343 $$ = declare_argument(abstract_name(), false); 1344 } 1345 | declaration_specifiers deftyp { 1346 $$ = declare_argument(abstract_name(), false); 1347 } 1348 | declmods deftyp notype_param_decl { 1349 $$ = declare_argument($3, false); 1350 } 1351 /* 1352 * param_decl is needed because of following conflict: 1353 * "typedef int a; f(int (a));" could be parsed as 1354 * "function with argument a of type int", or 1355 * "function with an abstract argument of type function". 1356 * This grammar realizes the second case. 1357 */ 1358 | declaration_specifiers deftyp param_decl { 1359 $$ = declare_argument($3, false); 1360 } 1361 | declmods deftyp abstract_decl { 1362 $$ = declare_argument($3, false); 1363 } 1364 | declaration_specifiers deftyp abstract_decl { 1365 $$ = declare_argument($3, false); 1366 } 1367 ; 1368 1369 opt_asm_or_symbolrename: /* expect only one */ 1370 /* empty */ { 1371 $$ = NULL; 1372 } 1373 | T_ASM T_LPAREN T_STRING T_RPAREN { 1374 freeyyv(&$3, T_STRING); 1375 $$ = NULL; 1376 } 1377 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN { 1378 $$ = $3; 1379 } 1380 ; 1381 1382 initializer: /* C99 6.7.8 "Initialization" */ 1383 expr %prec T_COMMA { 1384 init_expr($1); 1385 } 1386 | init_lbrace init_rbrace { 1387 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1388 } 1389 | init_lbrace initializer_list comma_opt init_rbrace 1390 | error 1391 ; 1392 1393 initializer_list: /* C99 6.7.8 "Initialization" */ 1394 initializer_list_item 1395 | initializer_list T_COMMA initializer_list_item 1396 ; 1397 1398 initializer_list_item: 1399 designation initializer 1400 | initializer 1401 ; 1402 1403 range: 1404 constant_expr { 1405 $$.lo = to_int_constant($1, true); 1406 $$.hi = $$.lo; 1407 } 1408 | constant_expr T_ELLIPSIS constant_expr { 1409 $$.lo = to_int_constant($1, true); 1410 $$.hi = to_int_constant($3, true); 1411 /* initialization with '[a...b]' is a GNU extension */ 1412 gnuism(340); 1413 } 1414 ; 1415 1416 designator: /* C99 6.7.8 "Initialization" */ 1417 T_LBRACK range T_RBRACK { 1418 add_designator_subscript($2); 1419 if (!Sflag) 1420 /* array initializer with des.s is a C9X feature */ 1421 warning(321); 1422 } 1423 | T_POINT identifier { 1424 if (!Sflag) 1425 /* struct or union member name in initializer is ... */ 1426 warning(313); 1427 add_designator_member($2); 1428 } 1429 ; 1430 1431 designator_list: /* C99 6.7.8 "Initialization" */ 1432 designator 1433 | designator_list designator 1434 ; 1435 1436 designation: /* C99 6.7.8 "Initialization" */ 1437 designator_list T_ASSIGN 1438 | identifier T_COLON { 1439 /* GCC style struct or union member name in initializer */ 1440 gnuism(315); 1441 add_designator_member($1); 1442 } 1443 ; 1444 1445 init_lbrace: 1446 T_LBRACE { 1447 init_lbrace(); 1448 } 1449 ; 1450 1451 init_rbrace: 1452 T_RBRACE { 1453 init_rbrace(); 1454 } 1455 ; 1456 1457 type_name: 1458 { 1459 begin_declaration_level(ABSTRACT); 1460 } abstract_declaration { 1461 end_declaration_level(); 1462 $$ = $2->s_type; 1463 } 1464 ; 1465 1466 abstract_declaration: 1467 noclass_declmods deftyp { 1468 $$ = declare_1_abstract(abstract_name()); 1469 } 1470 | noclass_declspecs deftyp { 1471 $$ = declare_1_abstract(abstract_name()); 1472 } 1473 | noclass_declmods deftyp abstract_decl { 1474 $$ = declare_1_abstract($3); 1475 } 1476 | noclass_declspecs deftyp abstract_decl { 1477 $$ = declare_1_abstract($3); 1478 } 1479 ; 1480 1481 abstract_decl: 1482 pointer { 1483 $$ = add_pointer(abstract_name(), $1); 1484 } 1485 | direct_abstract_decl { 1486 $$ = $1; 1487 } 1488 | pointer direct_abstract_decl { 1489 $$ = add_pointer($2, $1); 1490 } 1491 | T_TYPEOF term { 1492 $$ = mktempsym($2->tn_type); 1493 } 1494 ; 1495 1496 direct_abstract_decl: 1497 T_LPAREN abstract_decl T_RPAREN { 1498 $$ = $2; 1499 } 1500 | T_LBRACK T_RBRACK { 1501 $$ = add_array(abstract_name(), false, 0); 1502 } 1503 | T_LBRACK array_size T_RBRACK { 1504 $$ = add_array(abstract_name(), true, to_int_constant($2, false)); 1505 } 1506 | type_attribute direct_abstract_decl { 1507 $$ = $2; 1508 } 1509 | direct_abstract_decl T_LBRACK T_RBRACK { 1510 $$ = add_array($1, false, 0); 1511 } 1512 | direct_abstract_decl T_LBRACK array_size T_RBRACK { 1513 $$ = add_array($1, true, to_int_constant($3, false)); 1514 } 1515 | abstract_decl_param_list opt_asm_or_symbolrename { 1516 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1517 end_declaration_level(); 1518 block_level--; 1519 } 1520 | direct_abstract_decl abstract_decl_param_list opt_asm_or_symbolrename { 1521 $$ = add_function(symbolrename($1, $3), $2); 1522 end_declaration_level(); 1523 block_level--; 1524 } 1525 | direct_abstract_decl type_attribute_list 1526 ; 1527 1528 non_expr_statement: 1529 type_attribute T_SEMI 1530 | labeled_statement 1531 | compound_statement 1532 | selection_statement 1533 | iteration_statement 1534 | jump_statement { 1535 seen_fallthrough = false; 1536 } 1537 | asm_statement 1538 ; 1539 1540 statement: /* C99 6.8 */ 1541 expr_statement 1542 | non_expr_statement 1543 ; 1544 1545 labeled_statement: /* C99 6.8.1 */ 1546 label opt_type_attribute statement 1547 ; 1548 1549 label: 1550 T_NAME T_COLON { 1551 symtyp = FLABEL; 1552 named_label(getsym($1)); 1553 } 1554 | T_CASE constant_expr T_COLON { 1555 case_label($2); 1556 seen_fallthrough = true; 1557 } 1558 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1559 /* XXX: We don't fill all cases */ 1560 case_label($2); 1561 seen_fallthrough = true; 1562 } 1563 | T_DEFAULT T_COLON { 1564 default_label(); 1565 seen_fallthrough = true; 1566 } 1567 ; 1568 1569 compound_statement: /* C99 6.8.2 */ 1570 compound_statement_lbrace compound_statement_rbrace 1571 | compound_statement_lbrace block_item_list compound_statement_rbrace 1572 ; 1573 1574 compound_statement_lbrace: 1575 T_LBRACE { 1576 block_level++; 1577 mem_block_level++; 1578 begin_declaration_level(AUTO); 1579 } 1580 ; 1581 1582 compound_statement_rbrace: 1583 T_RBRACE { 1584 end_declaration_level(); 1585 freeblk(); 1586 mem_block_level--; 1587 block_level--; 1588 seen_fallthrough = false; 1589 } 1590 ; 1591 1592 block_item_list: 1593 block_item 1594 | block_item_list block_item { 1595 if (!Sflag && $1 && !$2) 1596 /* declarations after statements is a C99 feature */ 1597 c99ism(327); 1598 } 1599 ; 1600 1601 block_item: 1602 statement { 1603 $$ = true; 1604 restore_warning_flags(); 1605 } 1606 | declaration { 1607 $$ = false; 1608 restore_warning_flags(); 1609 } 1610 ; 1611 1612 expr_statement: 1613 expr T_SEMI { 1614 expr($1, false, false, false, false); 1615 seen_fallthrough = false; 1616 } 1617 | T_SEMI { 1618 seen_fallthrough = false; 1619 } 1620 ; 1621 1622 selection_statement: /* C99 6.8.4 */ 1623 if_without_else { 1624 save_warning_flags(); 1625 if2(); 1626 if3(false); 1627 } 1628 | if_without_else T_ELSE { 1629 save_warning_flags(); 1630 if2(); 1631 } statement { 1632 clear_warning_flags(); 1633 if3(true); 1634 } 1635 | if_without_else T_ELSE error { 1636 clear_warning_flags(); 1637 if3(false); 1638 } 1639 | switch_expr statement { 1640 clear_warning_flags(); 1641 switch2(); 1642 } 1643 | switch_expr error { 1644 clear_warning_flags(); 1645 switch2(); 1646 } 1647 ; 1648 1649 if_without_else: 1650 if_expr statement 1651 | if_expr error 1652 ; 1653 1654 if_expr: 1655 T_IF T_LPAREN expr T_RPAREN { 1656 if1($3); 1657 clear_warning_flags(); 1658 } 1659 ; 1660 1661 switch_expr: 1662 T_SWITCH T_LPAREN expr T_RPAREN { 1663 switch1($3); 1664 clear_warning_flags(); 1665 } 1666 ; 1667 1668 association: 1669 type_name T_COLON expr 1670 | T_DEFAULT T_COLON expr 1671 ; 1672 1673 association_list: 1674 association 1675 | association_list T_COMMA association 1676 ; 1677 1678 generic_expr: 1679 T_GENERIC T_LPAREN expr T_COMMA association_list T_RPAREN { 1680 $$ = $3; 1681 } 1682 ; 1683 1684 do_statement: 1685 do statement { 1686 clear_warning_flags(); 1687 } 1688 ; 1689 1690 iteration_statement: /* C99 6.8.5 */ 1691 while_expr statement { 1692 clear_warning_flags(); 1693 while2(); 1694 } 1695 | while_expr error { 1696 clear_warning_flags(); 1697 while2(); 1698 } 1699 | do_statement do_while_expr { 1700 do2($2); 1701 seen_fallthrough = false; 1702 } 1703 | do error { 1704 clear_warning_flags(); 1705 do2(NULL); 1706 } 1707 | for_exprs statement { 1708 clear_warning_flags(); 1709 for2(); 1710 end_declaration_level(); 1711 block_level--; 1712 } 1713 | for_exprs error { 1714 clear_warning_flags(); 1715 for2(); 1716 end_declaration_level(); 1717 block_level--; 1718 } 1719 ; 1720 1721 while_expr: 1722 T_WHILE T_LPAREN expr T_RPAREN { 1723 while1($3); 1724 clear_warning_flags(); 1725 } 1726 ; 1727 1728 do: 1729 T_DO { 1730 do1(); 1731 } 1732 ; 1733 1734 do_while_expr: 1735 T_WHILE T_LPAREN expr T_RPAREN T_SEMI { 1736 $$ = $3; 1737 } 1738 ; 1739 1740 for_start: 1741 T_FOR T_LPAREN { 1742 begin_declaration_level(AUTO); 1743 block_level++; 1744 } 1745 ; 1746 for_exprs: 1747 for_start declaration_specifiers deftyp notype_init_decls T_SEMI 1748 opt_expr T_SEMI opt_expr T_RPAREN { 1749 /* variable declaration in for loop */ 1750 c99ism(325); 1751 for1(NULL, $6, $8); 1752 clear_warning_flags(); 1753 } 1754 | for_start opt_expr T_SEMI opt_expr T_SEMI opt_expr T_RPAREN { 1755 for1($2, $4, $6); 1756 clear_warning_flags(); 1757 } 1758 ; 1759 1760 opt_expr: 1761 /* empty */ { 1762 $$ = NULL; 1763 } 1764 | expr { 1765 $$ = $1; 1766 } 1767 ; 1768 1769 jump_statement: /* C99 6.8.6 */ 1770 goto identifier T_SEMI { 1771 do_goto(getsym($2)); 1772 } 1773 | goto error T_SEMI { 1774 symtyp = FVFT; 1775 } 1776 | T_CONTINUE T_SEMI { 1777 do_continue(); 1778 } 1779 | T_BREAK T_SEMI { 1780 do_break(); 1781 } 1782 | T_RETURN T_SEMI { 1783 do_return(NULL); 1784 } 1785 | T_RETURN expr T_SEMI { 1786 do_return($2); 1787 } 1788 ; 1789 1790 goto: 1791 T_GOTO { 1792 symtyp = FLABEL; 1793 } 1794 ; 1795 1796 asm_statement: 1797 T_ASM T_LPAREN read_until_rparen T_SEMI { 1798 setasm(); 1799 } 1800 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1801 setasm(); 1802 } 1803 | T_ASM error 1804 ; 1805 1806 read_until_rparen: 1807 /* empty */ { 1808 ignore_up_to_rparen(); 1809 } 1810 ; 1811 1812 constant_expr_list_opt: 1813 /* empty */ 1814 | constant_expr_list 1815 ; 1816 1817 constant_expr_list: 1818 constant_expr 1819 | constant_expr_list T_COMMA constant_expr 1820 ; 1821 1822 constant_expr: /* C99 6.6 */ 1823 expr %prec T_ASSIGN { 1824 $$ = $1; 1825 } 1826 ; 1827 1828 expr: 1829 expr T_ASTERISK expr { 1830 $$ = build(MULT, $1, $3); 1831 } 1832 | expr T_MULTIPLICATIVE expr { 1833 $$ = build($2, $1, $3); 1834 } 1835 | expr T_ADDITIVE expr { 1836 $$ = build($2, $1, $3); 1837 } 1838 | expr T_SHIFT expr { 1839 $$ = build($2, $1, $3); 1840 } 1841 | expr T_RELATIONAL expr { 1842 $$ = build($2, $1, $3); 1843 } 1844 | expr T_EQUALITY expr { 1845 $$ = build($2, $1, $3); 1846 } 1847 | expr T_AMPER expr { 1848 $$ = build(BITAND, $1, $3); 1849 } 1850 | expr T_BITXOR expr { 1851 $$ = build(BITXOR, $1, $3); 1852 } 1853 | expr T_BITOR expr { 1854 $$ = build(BITOR, $1, $3); 1855 } 1856 | expr T_LOGAND expr { 1857 $$ = build(LOGAND, $1, $3); 1858 } 1859 | expr T_LOGOR expr { 1860 $$ = build(LOGOR, $1, $3); 1861 } 1862 | expr T_QUEST expr T_COLON expr { 1863 $$ = build(QUEST, $1, build(COLON, $3, $5)); 1864 } 1865 | expr T_ASSIGN expr { 1866 $$ = build(ASSIGN, $1, $3); 1867 } 1868 | expr T_OPASSIGN expr { 1869 $$ = build($2, $1, $3); 1870 } 1871 | expr T_COMMA expr { 1872 $$ = build(COMMA, $1, $3); 1873 } 1874 | term { 1875 $$ = $1; 1876 } 1877 | generic_expr { 1878 $$ = $1; 1879 } 1880 ; 1881 1882 term: 1883 T_NAME { 1884 /* XXX really necessary? */ 1885 if (yychar < 0) 1886 yychar = yylex(); 1887 $$ = new_name_node(getsym($1), yychar); 1888 } 1889 | string { 1890 $$ = new_string_node($1); 1891 } 1892 | T_CON { 1893 $$ = expr_new_constant(gettyp($1->v_tspec), $1); 1894 } 1895 | T_LPAREN expr T_RPAREN { 1896 if ($2 != NULL) 1897 $2->tn_parenthesized = true; 1898 $$ = $2; 1899 } 1900 | T_LPAREN compound_statement_lbrace gcc_statement_expr_list { 1901 block_level--; 1902 mem_block_level--; 1903 begin_initialization(mktempsym(dup_type($3->tn_type))); 1904 mem_block_level++; 1905 block_level++; 1906 /* ({ }) is a GCC extension */ 1907 gnuism(320); 1908 } compound_statement_rbrace T_RPAREN { 1909 $$ = new_name_node(*current_initsym(), 0); 1910 end_initialization(); 1911 } 1912 | term T_INCDEC { 1913 $$ = build($2 == INC ? INCAFT : DECAFT, $1, NULL); 1914 } 1915 | T_INCDEC term { 1916 $$ = build($1 == INC ? INCBEF : DECBEF, $2, NULL); 1917 } 1918 | T_ASTERISK term { 1919 $$ = build(INDIR, $2, NULL); 1920 } 1921 | T_AMPER term { 1922 $$ = build(ADDR, $2, NULL); 1923 } 1924 | T_UNARY term { 1925 $$ = build($1, $2, NULL); 1926 } 1927 | T_ADDITIVE term { 1928 if (tflag && $1 == PLUS) { 1929 /* unary + is illegal in traditional C */ 1930 warning(100); 1931 } 1932 $$ = build($1 == PLUS ? UPLUS : UMINUS, $2, NULL); 1933 } 1934 | term T_LBRACK expr T_RBRACK { 1935 $$ = build(INDIR, build(PLUS, $1, $3), NULL); 1936 } 1937 | term T_LPAREN T_RPAREN { 1938 $$ = new_function_call_node($1, NULL); 1939 } 1940 | term T_LPAREN func_arg_list T_RPAREN { 1941 $$ = new_function_call_node($1, $3); 1942 } 1943 | term point_or_arrow T_NAME { 1944 if ($1 != NULL) { 1945 sym_t *msym; 1946 /* 1947 * XXX struct_or_union_member should be integrated 1948 * in build() 1949 */ 1950 if ($2 == ARROW) { 1951 /* 1952 * must do this before struct_or_union_member 1953 * is called 1954 */ 1955 $1 = cconv($1); 1956 } 1957 msym = struct_or_union_member($1, $2, getsym($3)); 1958 $$ = build($2, $1, new_name_node(msym, 0)); 1959 } else { 1960 $$ = NULL; 1961 } 1962 } 1963 | T_REAL term { 1964 $$ = build(REAL, $2, NULL); 1965 } 1966 | T_IMAG term { 1967 $$ = build(IMAG, $2, NULL); 1968 } 1969 | T_EXTENSION term { 1970 $$ = $2; 1971 } 1972 | T_REAL T_LPAREN term T_RPAREN { 1973 $$ = build(REAL, $3, NULL); 1974 } 1975 | T_IMAG T_LPAREN term T_RPAREN { 1976 $$ = build(IMAG, $3, NULL); 1977 } 1978 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 1979 symtyp = FMEMBER; 1980 $$ = build_offsetof($3, getsym($5)); 1981 } 1982 | T_SIZEOF term { 1983 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 1984 if ($$ != NULL) 1985 check_expr_misc($2, false, false, false, false, false, true); 1986 } 1987 | T_SIZEOF T_LPAREN type_name T_RPAREN %prec T_SIZEOF { 1988 $$ = build_sizeof($3); 1989 } 1990 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 1991 $$ = build_alignof($3); 1992 } 1993 | T_LPAREN type_name T_RPAREN term %prec T_UNARY { 1994 $$ = cast($4, $2); 1995 } 1996 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 1997 sym_t *tmp = mktempsym($2); 1998 begin_initialization(tmp); 1999 cgram_declare(tmp, true, NULL); 2000 } init_lbrace initializer_list comma_opt init_rbrace { 2001 if (!Sflag) 2002 /* compound literals are a C9X/GCC extension */ 2003 gnuism(319); 2004 $$ = new_name_node(*current_initsym(), 0); 2005 end_initialization(); 2006 } 2007 ; 2008 2009 /* 2010 * The inner part of a GCC statement-expression of the form ({ ... }). 2011 * 2012 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 2013 */ 2014 gcc_statement_expr_list: 2015 gcc_statement_expr_item 2016 | gcc_statement_expr_list gcc_statement_expr_item { 2017 $$ = $2; 2018 } 2019 ; 2020 2021 gcc_statement_expr_item: 2022 declaration { 2023 clear_warning_flags(); 2024 $$ = NULL; 2025 } 2026 | non_expr_statement { 2027 $$ = expr_zalloc_tnode(); 2028 $$->tn_type = gettyp(VOID); 2029 } 2030 | expr T_SEMI { 2031 if ($1 == NULL) { /* in case of syntax errors */ 2032 $$ = expr_zalloc_tnode(); 2033 $$->tn_type = gettyp(VOID); 2034 } else { 2035 /* XXX: do that only on the last name */ 2036 if ($1->tn_op == NAME) 2037 $1->tn_sym->s_used = true; 2038 $$ = $1; 2039 expr($1, false, false, false, false); 2040 seen_fallthrough = false; 2041 } 2042 } 2043 ; 2044 2045 string: 2046 T_STRING { 2047 $$ = $1; 2048 } 2049 | T_STRING string2 { 2050 $$ = cat_strings($1, $2); 2051 } 2052 ; 2053 2054 string2: 2055 T_STRING { 2056 if (tflag) { 2057 /* concatenated strings are illegal in traditional C */ 2058 warning(219); 2059 } 2060 $$ = $1; 2061 } 2062 | string2 T_STRING { 2063 $$ = cat_strings($1, $2); 2064 } 2065 ; 2066 2067 func_arg_list: 2068 expr %prec T_COMMA { 2069 $$ = new_function_argument_node(NULL, $1); 2070 } 2071 | func_arg_list T_COMMA expr { 2072 $$ = new_function_argument_node($1, $3); 2073 } 2074 ; 2075 2076 point_or_arrow: 2077 T_POINT { 2078 symtyp = FMEMBER; 2079 $$ = POINT; 2080 } 2081 | T_ARROW { 2082 symtyp = FMEMBER; 2083 $$ = ARROW; 2084 } 2085 ; 2086 2087 identifier: /* C99 6.4.2.1 */ 2088 T_NAME { 2089 $$ = $1; 2090 cgram_debug("name '%s'", $$->sb_name); 2091 } 2092 | T_TYPENAME { 2093 $$ = $1; 2094 cgram_debug("typename '%s'", $$->sb_name); 2095 } 2096 ; 2097 2098 comma_opt: 2099 T_COMMA 2100 | /* empty */ 2101 ; 2102 %% 2103 2104 /* ARGSUSED */ 2105 int 2106 yyerror(const char *msg) 2107 { 2108 /* syntax error '%s' */ 2109 error(249, yytext); 2110 if (++sytxerr >= 5) 2111 norecover(); 2112 return 0; 2113 } 2114 2115 static void 2116 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2117 { 2118 declare(decl, initflg, renaming); 2119 if (renaming != NULL) 2120 freeyyv(&renaming, T_NAME); 2121 } 2122 2123 /* 2124 * Discard all input tokens up to and including the next 2125 * unmatched right paren 2126 */ 2127 static void 2128 ignore_up_to_rparen(void) 2129 { 2130 int level; 2131 2132 if (yychar < 0) 2133 yychar = yylex(); 2134 freeyyv(&yylval, yychar); 2135 2136 level = 1; 2137 while (yychar != T_RPAREN || --level > 0) { 2138 if (yychar == T_LPAREN) { 2139 level++; 2140 } else if (yychar <= 0) { 2141 break; 2142 } 2143 freeyyv(&yylval, yychar = yylex()); 2144 } 2145 2146 yyclearin; 2147 } 2148 2149 static sym_t * 2150 symbolrename(sym_t *s, sbuf_t *sb) 2151 { 2152 if (sb != NULL) 2153 s->s_rename = sb->sb_name; 2154 return s; 2155 } 2156
Indexes created Thu Oct 02 01:09:59 GMT 2025