cgram.y revision 1.417
1 %{ 2 /* $NetBSD: cgram.y,v 1.417 2022/05/26 12:27:25 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) 38 __RCSID("$NetBSD: cgram.y,v 1.417 2022/05/26 12:27:25 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 size_t 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 read_until_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 debug_step("%s:%zu: clearing flags", file, line); 79 clear_warn_flags(); 80 olwarn = LWARN_BAD; 81 } 82 83 static void 84 SAVE_WARN_FLAGS(const char *file, size_t line) 85 { 86 /* 87 * There used to be an assertion for 'olwarn == LWARN_BAD' here, 88 * but that triggered for the following code: 89 * 90 * void function(int x) { if (x > 0) if (x > 1) return; } 91 */ 92 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 93 olwarn = lwarn; 94 } 95 96 static void 97 RESTORE_WARN_FLAGS(const char *file, size_t line) 98 { 99 if (olwarn != LWARN_BAD) { 100 lwarn = olwarn; 101 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 102 olwarn = LWARN_BAD; 103 } else 104 CLEAR_WARN_FLAGS(file, line); 105 } 106 #else 107 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 108 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 109 #define RESTORE_WARN_FLAGS(f, l) \ 110 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 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->u.s_member.sm_sou_type = NULL; 123 } 124 125 #if YYDEBUG && (YYBYACC || YYBISON) 126 #define YYSTYPE_TOSTRING cgram_to_string 127 #endif 128 #if YYDEBUG && YYBISON 129 #define YYPRINT cgram_print 130 #endif 131 132 %} 133 134 %expect 129 135 136 %union { 137 val_t *y_val; 138 sbuf_t *y_name; 139 sym_t *y_sym; 140 op_t y_op; 141 scl_t y_scl; 142 tspec_t y_tspec; 143 tqual_t y_tqual; 144 type_t *y_type; 145 tnode_t *y_tnode; 146 range_t y_range; 147 strg_t *y_string; 148 qual_ptr *y_qual_ptr; 149 bool y_seen_statement; 150 struct generic_association *y_generic; 151 struct array_size y_array_size; 152 bool y_in_system_header; 153 }; 154 155 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 156 %token T_POINT T_ARROW 157 %token T_COMPLEMENT T_LOGNOT 158 %token <y_op> T_INCDEC 159 %token T_SIZEOF 160 %token T_BUILTIN_OFFSETOF 161 %token T_TYPEOF 162 %token T_EXTENSION 163 %token T_ALIGNAS 164 %token T_ALIGNOF 165 %token T_ASTERISK 166 %token <y_op> T_MULTIPLICATIVE 167 %token <y_op> T_ADDITIVE 168 %token <y_op> T_SHIFT 169 %token <y_op> T_RELATIONAL 170 %token <y_op> T_EQUALITY 171 %token T_AMPER 172 %token T_BITXOR 173 %token T_BITOR 174 %token T_LOGAND 175 %token T_LOGOR 176 %token T_QUEST 177 %token T_COLON 178 %token T_ASSIGN 179 %token <y_op> T_OPASSIGN 180 %token T_COMMA 181 %token T_SEMI 182 %token T_ELLIPSIS 183 %token T_REAL 184 %token T_IMAG 185 %token T_GENERIC 186 %token T_NORETURN 187 188 /* storage classes (extern, static, auto, register and typedef) */ 189 %token <y_scl> T_SCLASS 190 191 /* 192 * predefined type keywords (char, int, short, long, unsigned, signed, 193 * float, double, void); see T_TYPENAME for types from typedef 194 */ 195 %token <y_tspec> T_TYPE 196 197 /* qualifiers (const, volatile, restrict, _Thread_local) */ 198 %token <y_tqual> T_QUAL 199 200 /* struct or union */ 201 %token <y_tspec> T_STRUCT_OR_UNION 202 203 /* remaining keywords */ 204 %token T_ASM 205 %token T_BREAK 206 %token T_CASE 207 %token T_CONTINUE 208 %token T_DEFAULT 209 %token T_DO 210 %token T_ELSE 211 %token T_ENUM 212 %token T_FOR 213 %token T_GOTO 214 %token T_IF 215 %token T_PACKED 216 %token T_RETURN 217 %token T_SWITCH 218 %token T_SYMBOLRENAME 219 %token T_WHILE 220 %token T_STATIC_ASSERT 221 222 %token T_ATTRIBUTE 223 %token T_AT_ALIAS 224 %token T_AT_ALIGNED 225 %token T_AT_ALLOC_SIZE 226 %token T_AT_ALWAYS_INLINE 227 %token T_AT_BOUNDED 228 %token T_AT_BUFFER 229 %token T_AT_COLD 230 %token T_AT_COMMON 231 %token T_AT_CONSTRUCTOR 232 %token T_AT_DEPRECATED 233 %token T_AT_DESTRUCTOR 234 %token T_AT_DISABLE_SANITIZER_INSTRUMENTATION 235 %token T_AT_FALLTHROUGH 236 %token T_AT_FORMAT 237 %token T_AT_FORMAT_ARG 238 %token T_AT_FORMAT_GNU_PRINTF 239 %token T_AT_FORMAT_PRINTF 240 %token T_AT_FORMAT_SCANF 241 %token T_AT_FORMAT_STRFMON 242 %token T_AT_FORMAT_STRFTIME 243 %token T_AT_FORMAT_SYSLOG 244 %token T_AT_GNU_INLINE 245 %token T_AT_HOT 246 %token T_AT_MALLOC 247 %token T_AT_MAY_ALIAS 248 %token T_AT_MINBYTES 249 %token T_AT_MODE 250 %token T_AT_NO_SANITIZE 251 %token T_AT_NO_SANITIZE_THREAD 252 %token T_AT_NOINLINE 253 %token T_AT_NONNULL 254 %token T_AT_NONSTRING 255 %token T_AT_NORETURN 256 %token T_AT_NOTHROW 257 %token T_AT_NO_INSTRUMENT_FUNCTION 258 %token T_AT_OPTIMIZE 259 %token T_AT_OPTNONE 260 %token T_AT_PACKED 261 %token T_AT_PCS 262 %token T_AT_PURE 263 %token T_AT_REGPARM 264 %token T_AT_RETURNS_NONNULL 265 %token T_AT_RETURNS_TWICE 266 %token T_AT_SECTION 267 %token T_AT_SENTINEL 268 %token T_AT_STRING 269 %token T_AT_TARGET 270 %token T_AT_TLS_MODEL 271 %token T_AT_TUNION 272 %token T_AT_UNUSED 273 %token T_AT_USED 274 %token T_AT_VISIBILITY 275 %token T_AT_WARN_UNUSED_RESULT 276 %token T_AT_WEAK 277 278 %left T_THEN 279 %left T_ELSE 280 %right T_QUEST T_COLON 281 %left T_LOGOR 282 %left T_LOGAND 283 %left T_BITOR 284 %left T_BITXOR 285 %left T_AMPER 286 %left T_EQUALITY 287 %left T_RELATIONAL 288 %left T_SHIFT 289 %left T_ADDITIVE 290 %left T_ASTERISK T_MULTIPLICATIVE 291 292 %token <y_name> T_NAME 293 %token <y_name> T_TYPENAME 294 %token <y_val> T_CON 295 %token <y_string> T_STRING 296 297 %type <y_sym> identifier_sym 298 %type <y_name> identifier 299 %type <y_string> string 300 301 %type <y_tnode> primary_expression 302 %type <y_tnode> generic_selection 303 %type <y_generic> generic_assoc_list 304 %type <y_generic> generic_association 305 %type <y_tnode> postfix_expression 306 %type <y_tnode> gcc_statement_expr_list 307 %type <y_tnode> gcc_statement_expr_item 308 %type <y_op> point_or_arrow 309 %type <y_tnode> argument_expression_list 310 %type <y_tnode> unary_expression 311 %type <y_tnode> cast_expression 312 %type <y_tnode> conditional_expression 313 %type <y_tnode> assignment_expression 314 %type <y_tnode> expression_opt 315 %type <y_tnode> expression 316 %type <y_tnode> constant_expr 317 318 %type <y_type> begin_type_typespec 319 %type <y_type> type_specifier 320 %type <y_type> notype_type_specifier 321 %type <y_type> struct_or_union_specifier 322 %type <y_tspec> struct_or_union 323 %type <y_sym> braced_struct_declaration_list 324 %type <y_sym> struct_declaration_list_with_rbrace 325 %type <y_sym> struct_declaration_list 326 %type <y_sym> struct_declaration 327 %type <y_sym> notype_struct_declarators 328 %type <y_sym> type_struct_declarators 329 %type <y_sym> notype_struct_declarator 330 %type <y_sym> type_struct_declarator 331 %type <y_type> enum_specifier 332 %type <y_sym> enum_declaration 333 %type <y_sym> enums_with_opt_comma 334 %type <y_sym> enumerator_list 335 %type <y_sym> enumerator 336 %type <y_qual_ptr> type_qualifier 337 %type <y_qual_ptr> pointer 338 %type <y_qual_ptr> asterisk 339 %type <y_qual_ptr> type_qualifier_list_opt 340 %type <y_qual_ptr> type_qualifier_list 341 %type <y_sym> notype_declarator 342 %type <y_sym> type_declarator 343 %type <y_sym> notype_direct_declarator 344 %type <y_sym> type_direct_declarator 345 %type <y_sym> type_param_declarator 346 %type <y_sym> notype_param_declarator 347 %type <y_sym> direct_param_declarator 348 %type <y_sym> direct_notype_param_declarator 349 %type <y_sym> param_list 350 %type <y_array_size> array_size_opt 351 %type <y_tnode> array_size 352 %type <y_sym> identifier_list 353 %type <y_type> type_name 354 %type <y_sym> abstract_declaration 355 %type <y_sym> abstract_declarator 356 %type <y_sym> direct_abstract_declarator 357 %type <y_sym> abstract_decl_param_list 358 %type <y_sym> vararg_parameter_type_list 359 %type <y_sym> parameter_type_list 360 %type <y_sym> parameter_declaration 361 %type <y_range> range 362 %type <y_name> asm_or_symbolrename_opt 363 364 %type <y_seen_statement> block_item_list 365 %type <y_seen_statement> block_item 366 %type <y_tnode> do_while_expr 367 %type <y_sym> func_declarator 368 %type <y_in_system_header> sys 369 370 %{ 371 #if YYDEBUG && YYBISON 372 static inline void cgram_print(FILE *, int, YYSTYPE); 373 #endif 374 %} 375 376 %% 377 378 program: 379 /* empty */ { 380 /* TODO: Make this an error in C99 mode as well. */ 381 if (!allow_trad && !allow_c99) { 382 /* empty translation unit */ 383 error(272); 384 } else if (allow_c90) { 385 /* empty translation unit */ 386 warning(272); 387 } 388 } 389 | translation_unit 390 ; 391 392 identifier_sym: /* helper for struct/union/enum */ 393 identifier { 394 $$ = getsym($1); 395 } 396 ; 397 398 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 399 identifier: 400 T_NAME { 401 debug_step("cgram: name '%s'", $1->sb_name); 402 $$ = $1; 403 } 404 | T_TYPENAME { 405 debug_step("cgram: typename '%s'", $1->sb_name); 406 $$ = $1; 407 } 408 ; 409 410 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 411 string: 412 T_STRING 413 | string T_STRING { 414 if (!allow_c90) { 415 /* concatenated strings are illegal in traditional C */ 416 warning(219); 417 } 418 $$ = cat_strings($1, $2); 419 } 420 ; 421 422 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 423 primary_expression: 424 T_NAME { 425 bool sys_name, sys_next; 426 sys_name = in_system_header; 427 if (yychar < 0) 428 yychar = yylex(); 429 sys_next = in_system_header; 430 in_system_header = sys_name; 431 $$ = build_name(getsym($1), yychar == T_LPAREN); 432 in_system_header = sys_next; 433 } 434 | T_CON { 435 $$ = build_constant(gettyp($1->v_tspec), $1); 436 } 437 | string { 438 $$ = build_string($1); 439 } 440 | T_LPAREN expression T_RPAREN { 441 if ($2 != NULL) 442 $2->tn_parenthesized = true; 443 $$ = $2; 444 } 445 | generic_selection 446 /* GCC primary-expression, see c_parser_postfix_expression */ 447 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 448 symtyp = FMEMBER; 449 $$ = build_offsetof($3, getsym($5)); 450 } 451 ; 452 453 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 454 generic_selection: 455 T_GENERIC T_LPAREN assignment_expression T_COMMA 456 generic_assoc_list T_RPAREN { 457 /* generic selection requires C11 or later */ 458 c11ism(345); 459 $$ = build_generic_selection($3, $5); 460 } 461 ; 462 463 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 464 generic_assoc_list: 465 generic_association 466 | generic_assoc_list T_COMMA generic_association { 467 $3->ga_prev = $1; 468 $$ = $3; 469 } 470 ; 471 472 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 473 generic_association: 474 type_name T_COLON assignment_expression { 475 $$ = block_zero_alloc(sizeof(*$$)); 476 $$->ga_arg = $1; 477 $$->ga_result = $3; 478 } 479 | T_DEFAULT T_COLON assignment_expression { 480 $$ = block_zero_alloc(sizeof(*$$)); 481 $$->ga_arg = NULL; 482 $$->ga_result = $3; 483 } 484 ; 485 486 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 487 postfix_expression: 488 primary_expression 489 | postfix_expression T_LBRACK sys expression T_RBRACK { 490 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 491 } 492 | postfix_expression T_LPAREN sys T_RPAREN { 493 $$ = build_function_call($1, $3, NULL); 494 } 495 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 496 $$ = build_function_call($1, $3, $4); 497 } 498 | postfix_expression point_or_arrow sys T_NAME { 499 $$ = build_member_access($1, $2, $3, $4); 500 } 501 | postfix_expression T_INCDEC sys { 502 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 503 } 504 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 505 sym_t *tmp = mktempsym($2); 506 begin_initialization(tmp); 507 cgram_declare(tmp, true, NULL); 508 } init_lbrace initializer_list comma_opt init_rbrace { 509 if (!allow_c99) 510 /* compound literals are a C99/GCC extension */ 511 gnuism(319); 512 $$ = build_name(*current_initsym(), false); 513 end_initialization(); 514 } 515 | T_LPAREN compound_statement_lbrace { 516 begin_statement_expr(); 517 } gcc_statement_expr_list { 518 do_statement_expr($4); 519 } compound_statement_rbrace T_RPAREN { 520 $$ = end_statement_expr(); 521 } 522 ; 523 524 comma_opt: /* helper for 'postfix_expression' */ 525 /* empty */ 526 | T_COMMA 527 ; 528 529 /* 530 * The inner part of a GCC statement-expression of the form ({ ... }). 531 * 532 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 533 */ 534 gcc_statement_expr_list: 535 gcc_statement_expr_item 536 | gcc_statement_expr_list gcc_statement_expr_item { 537 $$ = $2; 538 } 539 ; 540 541 gcc_statement_expr_item: 542 declaration_or_error { 543 clear_warning_flags(); 544 $$ = NULL; 545 } 546 | non_expr_statement { 547 $$ = expr_alloc_tnode(); 548 $$->tn_type = gettyp(VOID); 549 } 550 | expression T_SEMI { 551 if ($1 == NULL) { /* in case of syntax errors */ 552 $$ = expr_alloc_tnode(); 553 $$->tn_type = gettyp(VOID); 554 } else { 555 /* XXX: do that only on the last name */ 556 if ($1->tn_op == NAME) 557 $1->tn_sym->s_used = true; 558 expr($1, false, false, false, false); 559 seen_fallthrough = false; 560 $$ = $1; 561 } 562 } 563 ; 564 565 point_or_arrow: /* helper for 'postfix_expression' */ 566 T_POINT { 567 symtyp = FMEMBER; 568 $$ = POINT; 569 } 570 | T_ARROW { 571 symtyp = FMEMBER; 572 $$ = ARROW; 573 } 574 ; 575 576 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 577 argument_expression_list: 578 assignment_expression { 579 $$ = build_function_argument(NULL, $1); 580 } 581 | argument_expression_list T_COMMA assignment_expression { 582 $$ = build_function_argument($1, $3); 583 } 584 ; 585 586 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 587 unary_expression: 588 postfix_expression 589 | T_INCDEC sys unary_expression { 590 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 591 } 592 | T_AMPER sys cast_expression { 593 $$ = build_unary(ADDR, $2, $3); 594 } 595 | T_ASTERISK sys cast_expression { 596 $$ = build_unary(INDIR, $2, $3); 597 } 598 | T_ADDITIVE sys cast_expression { 599 if (!allow_c90 && $1 == PLUS) { 600 /* unary + is illegal in traditional C */ 601 warning(100); 602 } 603 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 604 } 605 | T_COMPLEMENT sys cast_expression { 606 $$ = build_unary(COMPL, $2, $3); 607 } 608 | T_LOGNOT sys cast_expression { 609 $$ = build_unary(NOT, $2, $3); 610 } 611 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 612 $$ = build_unary(REAL, $2, $3); 613 } 614 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 615 $$ = build_unary(IMAG, $2, $3); 616 } 617 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 618 $$ = $2; 619 } 620 | T_SIZEOF unary_expression { 621 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 622 if ($$ != NULL) 623 check_expr_misc($2, 624 false, false, false, false, false, true); 625 } 626 | T_SIZEOF T_LPAREN type_name T_RPAREN { 627 $$ = build_sizeof($3); 628 } 629 | T_ALIGNOF unary_expression { 630 /* non type argument to alignof is a GCC extension */ 631 gnuism(349); 632 lint_assert($2 != NULL); 633 $$ = build_alignof($2->tn_type); 634 } 635 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 636 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 637 /* TODO: c11ism */ 638 $$ = build_alignof($3); 639 } 640 ; 641 642 /* The rule 'unary_operator' is inlined into unary_expression. */ 643 644 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 645 cast_expression: 646 unary_expression 647 | T_LPAREN type_name T_RPAREN cast_expression { 648 $$ = cast($4, $2); 649 } 650 ; 651 652 expression_opt: 653 /* empty */ { 654 $$ = NULL; 655 } 656 | expression 657 ; 658 659 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 660 /* 'conditional_expression' also implements 'additive_expression'. */ 661 /* 'conditional_expression' also implements 'shift_expression'. */ 662 /* 'conditional_expression' also implements 'relational_expression'. */ 663 /* 'conditional_expression' also implements 'equality_expression'. */ 664 /* 'conditional_expression' also implements 'AND_expression'. */ 665 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 666 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 667 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 668 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 669 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 670 conditional_expression: 671 cast_expression 672 | conditional_expression T_ASTERISK sys conditional_expression { 673 $$ = build_binary($1, MULT, $3, $4); 674 } 675 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 676 $$ = build_binary($1, $2, $3, $4); 677 } 678 | conditional_expression T_ADDITIVE sys conditional_expression { 679 $$ = build_binary($1, $2, $3, $4); 680 } 681 | conditional_expression T_SHIFT sys conditional_expression { 682 $$ = build_binary($1, $2, $3, $4); 683 } 684 | conditional_expression T_RELATIONAL sys conditional_expression { 685 $$ = build_binary($1, $2, $3, $4); 686 } 687 | conditional_expression T_EQUALITY sys conditional_expression { 688 $$ = build_binary($1, $2, $3, $4); 689 } 690 | conditional_expression T_AMPER sys conditional_expression { 691 $$ = build_binary($1, BITAND, $3, $4); 692 } 693 | conditional_expression T_BITXOR sys conditional_expression { 694 $$ = build_binary($1, BITXOR, $3, $4); 695 } 696 | conditional_expression T_BITOR sys conditional_expression { 697 $$ = build_binary($1, BITOR, $3, $4); 698 } 699 | conditional_expression T_LOGAND sys conditional_expression { 700 $$ = build_binary($1, LOGAND, $3, $4); 701 } 702 | conditional_expression T_LOGOR sys conditional_expression { 703 $$ = build_binary($1, LOGOR, $3, $4); 704 } 705 | conditional_expression T_QUEST sys 706 expression T_COLON sys conditional_expression { 707 $$ = build_binary($1, QUEST, $3, 708 build_binary($4, COLON, $6, $7)); 709 } 710 ; 711 712 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 713 assignment_expression: 714 conditional_expression 715 | unary_expression T_ASSIGN sys assignment_expression { 716 $$ = build_binary($1, ASSIGN, $3, $4); 717 } 718 | unary_expression T_OPASSIGN sys assignment_expression { 719 $$ = build_binary($1, $2, $3, $4); 720 } 721 ; 722 723 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 724 expression: 725 assignment_expression 726 | expression T_COMMA sys assignment_expression { 727 $$ = build_binary($1, COMMA, $3, $4); 728 } 729 ; 730 731 constant_expr_list_opt: /* helper for gcc_attribute */ 732 /* empty */ 733 | constant_expr_list 734 ; 735 736 constant_expr_list: /* helper for gcc_attribute */ 737 constant_expr 738 | constant_expr_list T_COMMA constant_expr 739 ; 740 741 constant_expr: /* C99 6.6 */ 742 conditional_expression 743 ; 744 745 declaration_or_error: 746 declaration 747 | error T_SEMI 748 ; 749 750 declaration: /* C99 6.7 */ 751 begin_type_declmods end_type T_SEMI { 752 if (dcs->d_scl == TYPEDEF) { 753 /* typedef declares no type name */ 754 warning(72); 755 } else { 756 /* empty declaration */ 757 warning(2); 758 } 759 } 760 | begin_type_declmods end_type notype_init_declarators T_SEMI { 761 if (dcs->d_scl == TYPEDEF) { 762 /* syntax error '%s' */ 763 error(249, "missing base type for typedef"); 764 } else { 765 /* old style declaration; add 'int' */ 766 error(1); 767 } 768 } 769 | begin_type_declaration_specifiers end_type T_SEMI { 770 if (dcs->d_scl == TYPEDEF) { 771 /* typedef declares no type name */ 772 warning(72); 773 } else if (!dcs->d_nonempty_decl) { 774 /* empty declaration */ 775 warning(2); 776 } 777 } 778 | begin_type_declaration_specifiers end_type 779 type_init_declarators T_SEMI 780 | static_assert_declaration 781 ; 782 783 begin_type_declaration_specifiers: /* see C99 6.7 */ 784 begin_type_typespec { 785 add_type($1); 786 } 787 | begin_type_declmods type_specifier { 788 add_type($2); 789 } 790 | type_attribute begin_type_declaration_specifiers 791 | begin_type_declaration_specifiers declmod 792 | begin_type_declaration_specifiers notype_type_specifier { 793 add_type($2); 794 } 795 ; 796 797 begin_type_declmods: /* see C99 6.7 */ 798 begin_type T_QUAL { 799 add_qualifier($2); 800 } 801 | begin_type T_SCLASS { 802 add_storage_class($2); 803 } 804 | begin_type_declmods declmod 805 ; 806 807 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 808 begin_type_specifier_qualifier_list_postfix 809 | type_attribute_list begin_type_specifier_qualifier_list_postfix 810 ; 811 812 begin_type_specifier_qualifier_list_postfix: 813 begin_type_typespec { 814 add_type($1); 815 } 816 | begin_type_qualifier_list type_specifier { 817 add_type($2); 818 } 819 | begin_type_specifier_qualifier_list_postfix T_QUAL { 820 add_qualifier($2); 821 } 822 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 823 add_type($2); 824 } 825 | begin_type_specifier_qualifier_list_postfix type_attribute 826 ; 827 828 begin_type_typespec: 829 begin_type notype_type_specifier { 830 $$ = $2; 831 } 832 | begin_type T_TYPENAME { 833 $$ = getsym($2)->s_type; 834 } 835 ; 836 837 begin_type_qualifier_list: 838 begin_type T_QUAL { 839 add_qualifier($2); 840 } 841 | begin_type_qualifier_list T_QUAL { 842 add_qualifier($2); 843 } 844 ; 845 846 declmod: 847 T_QUAL { 848 add_qualifier($1); 849 } 850 | T_SCLASS { 851 add_storage_class($1); 852 } 853 | type_attribute_list 854 ; 855 856 type_attribute_list_opt: 857 /* empty */ 858 | type_attribute_list 859 ; 860 861 type_attribute_list: 862 type_attribute 863 | type_attribute_list type_attribute 864 ; 865 866 type_attribute_opt: 867 /* empty */ 868 | type_attribute 869 ; 870 871 type_attribute: /* See C11 6.7 declaration-specifiers */ 872 gcc_attribute 873 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 874 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 875 | T_PACKED { 876 addpacked(); 877 } 878 | T_NORETURN 879 ; 880 881 begin_type: 882 /* empty */ { 883 begin_type(); 884 } 885 ; 886 887 end_type: 888 /* empty */ { 889 end_type(); 890 } 891 ; 892 893 type_specifier: /* C99 6.7.2 */ 894 notype_type_specifier 895 | T_TYPENAME { 896 $$ = getsym($1)->s_type; 897 } 898 ; 899 900 notype_type_specifier: /* see C99 6.7.2 */ 901 T_TYPE { 902 $$ = gettyp($1); 903 } 904 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 905 $$ = block_dup_type($3->tn_type); 906 $$->t_typeof = true; 907 } 908 | struct_or_union_specifier { 909 end_declaration_level(); 910 $$ = $1; 911 } 912 | enum_specifier { 913 end_declaration_level(); 914 $$ = $1; 915 } 916 ; 917 918 struct_or_union_specifier: /* C99 6.7.2.1 */ 919 struct_or_union identifier_sym { 920 /* 921 * STDC requires that "struct a;" always introduces 922 * a new tag if "a" is not declared at current level 923 * 924 * yychar is valid because otherwise the parser would not 925 * have been able to decide if it must shift or reduce 926 */ 927 $$ = mktag($2, $1, false, yychar == T_SEMI); 928 } 929 | struct_or_union identifier_sym { 930 dcs->d_tagtyp = mktag($2, $1, true, false); 931 } braced_struct_declaration_list { 932 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 933 } 934 | struct_or_union { 935 dcs->d_tagtyp = mktag(NULL, $1, true, false); 936 } braced_struct_declaration_list { 937 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 938 } 939 | struct_or_union error { 940 symtyp = FVFT; 941 $$ = gettyp(INT); 942 } 943 ; 944 945 struct_or_union: /* C99 6.7.2.1 */ 946 T_STRUCT_OR_UNION { 947 symtyp = FTAG; 948 begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); 949 dcs->d_offset_in_bits = 0; 950 dcs->d_sou_align_in_bits = CHAR_SIZE; 951 $$ = $1; 952 } 953 | struct_or_union type_attribute 954 ; 955 956 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 957 struct_declaration_lbrace struct_declaration_list_with_rbrace { 958 $$ = $2; 959 } 960 ; 961 962 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 963 T_LBRACE { 964 symtyp = FVFT; 965 } 966 ; 967 968 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 969 struct_declaration_list T_RBRACE 970 | T_RBRACE { 971 /* XXX: This is not allowed by any C standard. */ 972 $$ = NULL; 973 } 974 ; 975 976 struct_declaration_list: /* C99 6.7.2.1 */ 977 struct_declaration 978 | struct_declaration_list struct_declaration { 979 $$ = lnklst($1, $2); 980 } 981 ; 982 983 struct_declaration: /* C99 6.7.2.1 */ 984 begin_type_qualifier_list end_type { 985 /* ^^ There is no check for the missing type-specifier. */ 986 /* too late, i know, but getsym() compensates it */ 987 symtyp = FMEMBER; 988 } notype_struct_declarators type_attribute_opt T_SEMI { 989 symtyp = FVFT; 990 $$ = $4; 991 } 992 | begin_type_specifier_qualifier_list end_type { 993 symtyp = FMEMBER; 994 } type_struct_declarators type_attribute_opt T_SEMI { 995 symtyp = FVFT; 996 $$ = $4; 997 } 998 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 999 /* syntax error '%s' */ 1000 error(249, "member without type"); 1001 $$ = NULL; 1002 } 1003 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1004 T_SEMI { 1005 symtyp = FVFT; 1006 if (!allow_c11 && !allow_gcc) 1007 /* anonymous struct/union members is a C11 feature */ 1008 warning(49); 1009 if (is_struct_or_union(dcs->d_type->t_tspec)) { 1010 $$ = dcs->d_type->t_str->sou_first_member; 1011 /* add all the members of the anonymous struct/union */ 1012 anonymize($$); 1013 } else { 1014 /* syntax error '%s' */ 1015 error(249, "unnamed member"); 1016 $$ = NULL; 1017 } 1018 } 1019 | static_assert_declaration { 1020 $$ = NULL; 1021 } 1022 | error T_SEMI { 1023 symtyp = FVFT; 1024 $$ = NULL; 1025 } 1026 ; 1027 1028 notype_struct_declarators: 1029 notype_struct_declarator { 1030 $$ = declarator_1_struct_union($1); 1031 } 1032 | notype_struct_declarators { 1033 symtyp = FMEMBER; 1034 } T_COMMA type_struct_declarator { 1035 $$ = lnklst($1, declarator_1_struct_union($4)); 1036 } 1037 ; 1038 1039 type_struct_declarators: 1040 type_struct_declarator { 1041 $$ = declarator_1_struct_union($1); 1042 } 1043 | type_struct_declarators { 1044 symtyp = FMEMBER; 1045 } T_COMMA type_struct_declarator { 1046 $$ = lnklst($1, declarator_1_struct_union($4)); 1047 } 1048 ; 1049 1050 notype_struct_declarator: 1051 notype_declarator 1052 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1053 $$ = bitfield($1, to_int_constant($3, true)); 1054 } 1055 | { 1056 symtyp = FVFT; 1057 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1058 $$ = bitfield(NULL, to_int_constant($3, true)); 1059 } 1060 ; 1061 1062 type_struct_declarator: 1063 type_declarator 1064 | type_declarator T_COLON constant_expr { 1065 $$ = bitfield($1, to_int_constant($3, true)); 1066 } 1067 | { 1068 symtyp = FVFT; 1069 } T_COLON constant_expr { 1070 $$ = bitfield(NULL, to_int_constant($3, true)); 1071 } 1072 ; 1073 1074 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1075 enum_specifier: /* C99 6.7.2.2 */ 1076 enum gcc_attribute_list_opt identifier_sym { 1077 $$ = mktag($3, ENUM, false, false); 1078 } 1079 | enum gcc_attribute_list_opt identifier_sym { 1080 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1081 } enum_declaration /*gcc_attribute_list_opt*/ { 1082 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1083 } 1084 | enum gcc_attribute_list_opt { 1085 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1086 } enum_declaration /*gcc_attribute_list_opt*/ { 1087 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1088 } 1089 | enum error { 1090 symtyp = FVFT; 1091 $$ = gettyp(INT); 1092 } 1093 ; 1094 1095 enum: /* helper for C99 6.7.2.2 */ 1096 T_ENUM { 1097 symtyp = FTAG; 1098 begin_declaration_level(DK_ENUM_CONST); 1099 } 1100 ; 1101 1102 enum_declaration: /* helper for C99 6.7.2.2 */ 1103 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1104 $$ = $2; 1105 } 1106 ; 1107 1108 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1109 T_LBRACE { 1110 symtyp = FVFT; 1111 enumval = 0; 1112 } 1113 ; 1114 1115 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1116 enumerator_list 1117 | enumerator_list T_COMMA { 1118 if (!allow_c99 && !allow_trad) { 1119 /* trailing ',' prohibited in enum declaration */ 1120 error(54); 1121 } else { 1122 /* trailing ',' prohibited in enum declaration */ 1123 c99ism(54); 1124 } 1125 $$ = $1; 1126 } 1127 ; 1128 1129 enumerator_list: /* C99 6.7.2.2 */ 1130 enumerator 1131 | enumerator_list T_COMMA enumerator { 1132 $$ = lnklst($1, $3); 1133 } 1134 | error { 1135 $$ = NULL; 1136 } 1137 ; 1138 1139 enumerator: /* C99 6.7.2.2 */ 1140 identifier_sym gcc_attribute_list_opt { 1141 $$ = enumeration_constant($1, enumval, true); 1142 } 1143 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1144 $$ = enumeration_constant($1, to_int_constant($4, true), 1145 false); 1146 } 1147 ; 1148 1149 type_qualifier: /* C99 6.7.3 */ 1150 T_QUAL { 1151 $$ = xcalloc(1, sizeof(*$$)); 1152 if ($1 == CONST) 1153 $$->p_const = true; 1154 if ($1 == VOLATILE) 1155 $$->p_volatile = true; 1156 } 1157 ; 1158 1159 pointer: /* C99 6.7.5 */ 1160 asterisk type_qualifier_list_opt { 1161 $$ = merge_qualified_pointer($1, $2); 1162 } 1163 | asterisk type_qualifier_list_opt pointer { 1164 $$ = merge_qualified_pointer($1, $2); 1165 $$ = merge_qualified_pointer($$, $3); 1166 } 1167 ; 1168 1169 asterisk: /* helper for 'pointer' */ 1170 T_ASTERISK { 1171 $$ = xcalloc(1, sizeof(*$$)); 1172 $$->p_pointer = true; 1173 } 1174 ; 1175 1176 type_qualifier_list_opt: /* see C99 6.7.5 */ 1177 /* empty */ { 1178 $$ = NULL; 1179 } 1180 | type_qualifier_list 1181 ; 1182 1183 type_qualifier_list: /* C99 6.7.5 */ 1184 type_qualifier 1185 | type_qualifier_list type_qualifier { 1186 $$ = merge_qualified_pointer($1, $2); 1187 } 1188 ; 1189 1190 /* 1191 * For an explanation of 'notype' in the following rules, see 1192 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1193 */ 1194 1195 notype_init_declarators: 1196 notype_init_declarator 1197 | notype_init_declarators T_COMMA type_init_declarator 1198 ; 1199 1200 type_init_declarators: 1201 type_init_declarator 1202 | type_init_declarators T_COMMA type_init_declarator 1203 ; 1204 1205 notype_init_declarator: 1206 notype_declarator asm_or_symbolrename_opt { 1207 cgram_declare($1, false, $2); 1208 check_size($1); 1209 } 1210 | notype_declarator asm_or_symbolrename_opt { 1211 begin_initialization($1); 1212 cgram_declare($1, true, $2); 1213 } T_ASSIGN initializer { 1214 check_size($1); 1215 end_initialization(); 1216 } 1217 ; 1218 1219 type_init_declarator: 1220 type_declarator asm_or_symbolrename_opt { 1221 cgram_declare($1, false, $2); 1222 check_size($1); 1223 } 1224 | type_declarator asm_or_symbolrename_opt { 1225 begin_initialization($1); 1226 cgram_declare($1, true, $2); 1227 } T_ASSIGN initializer { 1228 check_size($1); 1229 end_initialization(); 1230 } 1231 ; 1232 1233 notype_declarator: 1234 notype_direct_declarator 1235 | pointer notype_direct_declarator { 1236 $$ = add_pointer($2, $1); 1237 } 1238 ; 1239 1240 type_declarator: 1241 type_direct_declarator 1242 | pointer type_direct_declarator { 1243 $$ = add_pointer($2, $1); 1244 } 1245 ; 1246 1247 notype_direct_declarator: 1248 type_attribute_list_opt T_NAME { 1249 $$ = declarator_name(getsym($2)); 1250 } 1251 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1252 $$ = $3; 1253 } 1254 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1255 $$ = add_array($1, $3.has_dim, $3.dim); 1256 } 1257 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1258 $$ = add_function(symbolrename($1, $3), $2); 1259 end_declaration_level(); 1260 block_level--; 1261 } 1262 | notype_direct_declarator type_attribute 1263 ; 1264 1265 type_direct_declarator: 1266 type_attribute_list_opt identifier { 1267 $$ = declarator_name(getsym($2)); 1268 } 1269 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1270 $$ = $3; 1271 } 1272 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1273 $$ = add_array($1, $3.has_dim, $3.dim); 1274 } 1275 | type_direct_declarator param_list asm_or_symbolrename_opt { 1276 $$ = add_function(symbolrename($1, $3), $2); 1277 end_declaration_level(); 1278 block_level--; 1279 } 1280 | type_direct_declarator type_attribute 1281 ; 1282 1283 /* 1284 * The two distinct rules type_param_declarator and notype_param_declarator 1285 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1286 * always treated as a typename, not an argument name. For example, after 1287 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1288 * "f(int (double));", not "f(int a);". 1289 */ 1290 type_param_declarator: 1291 direct_param_declarator 1292 | pointer direct_param_declarator { 1293 $$ = add_pointer($2, $1); 1294 } 1295 ; 1296 1297 notype_param_declarator: 1298 direct_notype_param_declarator 1299 | pointer direct_notype_param_declarator { 1300 $$ = add_pointer($2, $1); 1301 } 1302 ; 1303 1304 direct_param_declarator: 1305 identifier type_attribute_list { 1306 $$ = declarator_name(getsym($1)); 1307 } 1308 | identifier { 1309 $$ = declarator_name(getsym($1)); 1310 } 1311 | T_LPAREN notype_param_declarator T_RPAREN { 1312 $$ = $2; 1313 } 1314 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1315 gcc_attribute_list_opt { 1316 $$ = add_array($1, $3.has_dim, $3.dim); 1317 } 1318 | direct_param_declarator param_list asm_or_symbolrename_opt { 1319 $$ = add_function(symbolrename($1, $3), $2); 1320 end_declaration_level(); 1321 block_level--; 1322 } 1323 ; 1324 1325 direct_notype_param_declarator: 1326 identifier { 1327 $$ = declarator_name(getsym($1)); 1328 } 1329 | T_LPAREN notype_param_declarator T_RPAREN { 1330 $$ = $2; 1331 } 1332 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1333 $$ = add_array($1, $3.has_dim, $3.dim); 1334 } 1335 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1336 $$ = add_function(symbolrename($1, $3), $2); 1337 end_declaration_level(); 1338 block_level--; 1339 } 1340 ; 1341 1342 param_list: 1343 id_list_lparen identifier_list T_RPAREN { 1344 $$ = $2; 1345 } 1346 | abstract_decl_param_list 1347 ; 1348 1349 id_list_lparen: 1350 T_LPAREN { 1351 block_level++; 1352 begin_declaration_level(DK_PROTO_ARG); 1353 } 1354 ; 1355 1356 array_size_opt: 1357 /* empty */ { 1358 $$.has_dim = false; 1359 $$.dim = 0; 1360 } 1361 | T_ASTERISK { 1362 /* since C99; variable length array of unspecified size */ 1363 $$.has_dim = false; /* TODO: maybe change to true */ 1364 $$.dim = 0; /* just as a placeholder */ 1365 } 1366 | array_size { 1367 $$.has_dim = true; 1368 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1369 } 1370 ; 1371 1372 array_size: 1373 type_qualifier_list_opt T_SCLASS constant_expr { 1374 /* C11 6.7.6.3p7 */ 1375 if ($2 != STATIC) 1376 yyerror("Bad attribute"); 1377 /* static array size is a C11 extension */ 1378 c11ism(343); 1379 $$ = $3; 1380 } 1381 | T_QUAL { 1382 /* C11 6.7.6.2 */ 1383 if ($1 != RESTRICT) 1384 yyerror("Bad attribute"); 1385 $$ = NULL; 1386 } 1387 | constant_expr 1388 ; 1389 1390 identifier_list: /* C99 6.7.5 */ 1391 T_NAME { 1392 $$ = old_style_function_name(getsym($1)); 1393 } 1394 | identifier_list T_COMMA T_NAME { 1395 $$ = lnklst($1, old_style_function_name(getsym($3))); 1396 } 1397 | identifier_list error 1398 ; 1399 1400 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1401 type_name: /* C99 6.7.6 */ 1402 { 1403 begin_declaration_level(DK_ABSTRACT); 1404 } abstract_declaration { 1405 end_declaration_level(); 1406 $$ = $2->s_type; 1407 } 1408 ; 1409 1410 abstract_declaration: /* specific to lint */ 1411 begin_type_qualifier_list end_type { 1412 $$ = declare_1_abstract(abstract_name()); 1413 } 1414 | begin_type_specifier_qualifier_list end_type { 1415 $$ = declare_1_abstract(abstract_name()); 1416 } 1417 | begin_type_qualifier_list end_type abstract_declarator { 1418 $$ = declare_1_abstract($3); 1419 } 1420 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1421 $$ = declare_1_abstract($3); 1422 } 1423 ; 1424 1425 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1426 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1427 abstract_declarator: 1428 pointer { 1429 $$ = add_pointer(abstract_name(), $1); 1430 } 1431 | direct_abstract_declarator 1432 | pointer direct_abstract_declarator { 1433 $$ = add_pointer($2, $1); 1434 } 1435 | type_attribute_list direct_abstract_declarator { 1436 $$ = $2; 1437 } 1438 | pointer type_attribute_list direct_abstract_declarator { 1439 $$ = add_pointer($3, $1); 1440 } 1441 ; 1442 1443 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1444 direct_abstract_declarator: 1445 /* TODO: sort rules according to C99 */ 1446 T_LPAREN abstract_declarator T_RPAREN { 1447 $$ = $2; 1448 } 1449 | T_LBRACK array_size_opt T_RBRACK { 1450 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1451 } 1452 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1453 $$ = add_array($1, $3.has_dim, $3.dim); 1454 } 1455 | abstract_decl_param_list asm_or_symbolrename_opt { 1456 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1457 end_declaration_level(); 1458 block_level--; 1459 } 1460 | direct_abstract_declarator abstract_decl_param_list 1461 asm_or_symbolrename_opt { 1462 $$ = add_function(symbolrename($1, $3), $2); 1463 end_declaration_level(); 1464 block_level--; 1465 } 1466 | direct_abstract_declarator type_attribute_list 1467 ; 1468 1469 abstract_decl_param_list: /* specific to lint */ 1470 abstract_decl_lparen T_RPAREN type_attribute_opt { 1471 $$ = NULL; 1472 } 1473 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1474 type_attribute_opt { 1475 dcs->d_proto = true; 1476 $$ = $2; 1477 } 1478 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1479 $$ = NULL; 1480 } 1481 ; 1482 1483 abstract_decl_lparen: /* specific to lint */ 1484 T_LPAREN { 1485 block_level++; 1486 begin_declaration_level(DK_PROTO_ARG); 1487 } 1488 ; 1489 1490 vararg_parameter_type_list: /* specific to lint */ 1491 parameter_type_list 1492 | parameter_type_list T_COMMA T_ELLIPSIS { 1493 dcs->d_vararg = true; 1494 $$ = $1; 1495 } 1496 | T_ELLIPSIS { 1497 /* TODO: C99 6.7.5 makes this an error as well. */ 1498 if (!allow_trad && !allow_c99) { 1499 /* ANSI C requires formal parameter before '...' */ 1500 error(84); 1501 } else if (allow_c90) { 1502 /* ANSI C requires formal parameter before '...' */ 1503 warning(84); 1504 } 1505 dcs->d_vararg = true; 1506 $$ = NULL; 1507 } 1508 ; 1509 1510 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1511 parameter_type_list: 1512 parameter_declaration 1513 | parameter_type_list T_COMMA parameter_declaration { 1514 $$ = lnklst($1, $3); 1515 } 1516 ; 1517 1518 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1519 parameter_declaration: 1520 begin_type_declmods end_type { 1521 /* ^^ There is no check for the missing type-specifier. */ 1522 $$ = declare_argument(abstract_name(), false); 1523 } 1524 | begin_type_declaration_specifiers end_type { 1525 $$ = declare_argument(abstract_name(), false); 1526 } 1527 | begin_type_declmods end_type notype_param_declarator { 1528 /* ^^ There is no check for the missing type-specifier. */ 1529 $$ = declare_argument($3, false); 1530 } 1531 /* 1532 * type_param_declarator is needed because of following conflict: 1533 * "typedef int a; f(int (a));" could be parsed as 1534 * "function with argument a of type int", or 1535 * "function with an abstract argument of type function". 1536 * This grammar realizes the second case. 1537 */ 1538 | begin_type_declaration_specifiers end_type type_param_declarator { 1539 $$ = declare_argument($3, false); 1540 } 1541 | begin_type_declmods end_type abstract_declarator { 1542 /* ^^ There is no check for the missing type-specifier. */ 1543 $$ = declare_argument($3, false); 1544 } 1545 | begin_type_declaration_specifiers end_type abstract_declarator { 1546 $$ = declare_argument($3, false); 1547 } 1548 ; 1549 1550 initializer: /* C99 6.7.8 "Initialization" */ 1551 assignment_expression { 1552 init_expr($1); 1553 } 1554 | init_lbrace init_rbrace { 1555 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1556 } 1557 | init_lbrace initializer_list comma_opt init_rbrace 1558 /* XXX: What is this error handling for? */ 1559 | error 1560 ; 1561 1562 initializer_list: /* C99 6.7.8 "Initialization" */ 1563 initializer_list_item 1564 | initializer_list T_COMMA initializer_list_item 1565 ; 1566 1567 initializer_list_item: /* helper */ 1568 designation initializer 1569 | initializer 1570 ; 1571 1572 designation: /* C99 6.7.8 "Initialization" */ 1573 begin_designation designator_list T_ASSIGN 1574 | identifier T_COLON { 1575 /* GCC style struct or union member name in initializer */ 1576 gnuism(315); 1577 begin_designation(); 1578 add_designator_member($1); 1579 } 1580 ; 1581 1582 begin_designation: /* lint-specific helper */ 1583 /* empty */ { 1584 begin_designation(); 1585 } 1586 ; 1587 1588 designator_list: /* C99 6.7.8 "Initialization" */ 1589 designator 1590 | designator_list designator 1591 ; 1592 1593 designator: /* C99 6.7.8 "Initialization" */ 1594 T_LBRACK range T_RBRACK { 1595 if (!allow_c99) 1596 /* array initializer with designators is a C99 ... */ 1597 warning(321); 1598 add_designator_subscript($2); 1599 } 1600 | T_POINT identifier { 1601 if (!allow_c99) 1602 /* struct or union member name in initializer is ... */ 1603 warning(313); 1604 add_designator_member($2); 1605 } 1606 ; 1607 1608 static_assert_declaration: 1609 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1610 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1611 ; 1612 1613 range: 1614 constant_expr { 1615 $$.lo = to_int_constant($1, true); 1616 $$.hi = $$.lo; 1617 } 1618 | constant_expr T_ELLIPSIS constant_expr { 1619 $$.lo = to_int_constant($1, true); 1620 $$.hi = to_int_constant($3, true); 1621 /* initialization with '[a...b]' is a GCC extension */ 1622 gnuism(340); 1623 } 1624 ; 1625 1626 init_lbrace: /* helper */ 1627 T_LBRACE { 1628 init_lbrace(); 1629 } 1630 ; 1631 1632 init_rbrace: /* helper */ 1633 T_RBRACE { 1634 init_rbrace(); 1635 } 1636 ; 1637 1638 asm_or_symbolrename_opt: /* GCC extensions */ 1639 /* empty */ { 1640 $$ = NULL; 1641 } 1642 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1643 freeyyv(&$3, T_STRING); 1644 $$ = NULL; 1645 } 1646 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1647 $$ = $3; 1648 } 1649 ; 1650 1651 statement: /* C99 6.8 */ 1652 expression_statement 1653 | non_expr_statement 1654 ; 1655 1656 non_expr_statement: /* helper for C99 6.8 */ 1657 gcc_attribute /* ((__fallthrough__)) */ T_SEMI 1658 | labeled_statement 1659 | compound_statement 1660 | selection_statement 1661 | iteration_statement 1662 | jump_statement { 1663 seen_fallthrough = false; 1664 } 1665 | asm_statement 1666 ; 1667 1668 labeled_statement: /* C99 6.8.1 */ 1669 label gcc_attribute_list_opt statement 1670 ; 1671 1672 label: 1673 T_NAME T_COLON { 1674 symtyp = FLABEL; 1675 named_label(getsym($1)); 1676 } 1677 | T_CASE constant_expr T_COLON { 1678 case_label($2); 1679 seen_fallthrough = true; 1680 } 1681 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1682 /* XXX: We don't fill all cases */ 1683 case_label($2); 1684 seen_fallthrough = true; 1685 } 1686 | T_DEFAULT T_COLON { 1687 default_label(); 1688 seen_fallthrough = true; 1689 } 1690 ; 1691 1692 compound_statement: /* C99 6.8.2 */ 1693 compound_statement_lbrace compound_statement_rbrace 1694 | compound_statement_lbrace block_item_list compound_statement_rbrace 1695 ; 1696 1697 compound_statement_lbrace: 1698 T_LBRACE { 1699 block_level++; 1700 mem_block_level++; 1701 begin_declaration_level(DK_AUTO); 1702 } 1703 ; 1704 1705 compound_statement_rbrace: 1706 T_RBRACE { 1707 end_declaration_level(); 1708 level_free_all(mem_block_level); 1709 mem_block_level--; 1710 block_level--; 1711 seen_fallthrough = false; 1712 } 1713 ; 1714 1715 block_item_list: /* C99 6.8.2 */ 1716 block_item 1717 | block_item_list block_item { 1718 if ($1 && !$2) 1719 /* declarations after statements is a C99 feature */ 1720 c99ism(327); 1721 $$ = $1 || $2; 1722 } 1723 ; 1724 1725 block_item: /* C99 6.8.2 */ 1726 declaration_or_error { 1727 $$ = false; 1728 restore_warning_flags(); 1729 } 1730 | statement { 1731 $$ = true; 1732 restore_warning_flags(); 1733 } 1734 ; 1735 1736 expression_statement: /* C99 6.8.3 */ 1737 expression T_SEMI { 1738 expr($1, false, false, false, false); 1739 seen_fallthrough = false; 1740 } 1741 | T_SEMI { 1742 check_statement_reachable(); 1743 seen_fallthrough = false; 1744 } 1745 ; 1746 1747 selection_statement: /* C99 6.8.4 */ 1748 if_without_else %prec T_THEN { 1749 save_warning_flags(); 1750 if2(); 1751 if3(false); 1752 } 1753 | if_without_else T_ELSE { 1754 save_warning_flags(); 1755 if2(); 1756 } statement { 1757 clear_warning_flags(); 1758 if3(true); 1759 } 1760 | if_without_else T_ELSE error { 1761 clear_warning_flags(); 1762 if3(false); 1763 } 1764 | switch_expr statement { 1765 clear_warning_flags(); 1766 switch2(); 1767 } 1768 | switch_expr error { 1769 clear_warning_flags(); 1770 switch2(); 1771 } 1772 ; 1773 1774 if_without_else: /* see C99 6.8.4 */ 1775 if_expr statement 1776 | if_expr error 1777 ; 1778 1779 if_expr: /* see C99 6.8.4 */ 1780 T_IF T_LPAREN expression T_RPAREN { 1781 if1($3); 1782 clear_warning_flags(); 1783 } 1784 ; 1785 1786 switch_expr: /* see C99 6.8.4 */ 1787 T_SWITCH T_LPAREN expression T_RPAREN { 1788 switch1($3); 1789 clear_warning_flags(); 1790 } 1791 ; 1792 1793 iteration_statement: /* C99 6.8.5 */ 1794 while_expr statement { 1795 clear_warning_flags(); 1796 while2(); 1797 } 1798 | while_expr error { 1799 clear_warning_flags(); 1800 while2(); 1801 } 1802 | do_statement do_while_expr { 1803 do2($2); 1804 seen_fallthrough = false; 1805 } 1806 | do error { 1807 clear_warning_flags(); 1808 do2(NULL); 1809 } 1810 | for_exprs statement { 1811 clear_warning_flags(); 1812 for2(); 1813 end_declaration_level(); 1814 block_level--; 1815 } 1816 | for_exprs error { 1817 clear_warning_flags(); 1818 for2(); 1819 end_declaration_level(); 1820 block_level--; 1821 } 1822 ; 1823 1824 while_expr: /* see C99 6.8.5 */ 1825 T_WHILE T_LPAREN expression T_RPAREN { 1826 while1($3); 1827 clear_warning_flags(); 1828 } 1829 ; 1830 1831 do_statement: /* see C99 6.8.5 */ 1832 do statement { 1833 clear_warning_flags(); 1834 } 1835 ; 1836 1837 do: /* see C99 6.8.5 */ 1838 T_DO { 1839 do1(); 1840 } 1841 ; 1842 1843 do_while_expr: /* see C99 6.8.5 */ 1844 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1845 $$ = $3; 1846 } 1847 ; 1848 1849 for_start: /* see C99 6.8.5 */ 1850 T_FOR T_LPAREN { 1851 begin_declaration_level(DK_AUTO); 1852 block_level++; 1853 } 1854 ; 1855 1856 for_exprs: /* see C99 6.8.5 */ 1857 for_start 1858 begin_type_declaration_specifiers end_type 1859 notype_init_declarators T_SEMI 1860 expression_opt T_SEMI 1861 expression_opt T_RPAREN { 1862 /* variable declaration in for loop */ 1863 c99ism(325); 1864 for1(NULL, $6, $8); 1865 clear_warning_flags(); 1866 } 1867 | for_start 1868 expression_opt T_SEMI 1869 expression_opt T_SEMI 1870 expression_opt T_RPAREN { 1871 for1($2, $4, $6); 1872 clear_warning_flags(); 1873 } 1874 ; 1875 1876 jump_statement: /* C99 6.8.6 */ 1877 goto identifier T_SEMI { 1878 do_goto(getsym($2)); 1879 } 1880 | goto error T_SEMI { 1881 symtyp = FVFT; 1882 } 1883 | T_CONTINUE T_SEMI { 1884 do_continue(); 1885 } 1886 | T_BREAK T_SEMI { 1887 do_break(); 1888 } 1889 | T_RETURN sys T_SEMI { 1890 do_return($2, NULL); 1891 } 1892 | T_RETURN sys expression T_SEMI { 1893 do_return($2, $3); 1894 } 1895 ; 1896 1897 goto: /* see C99 6.8.6 */ 1898 T_GOTO { 1899 symtyp = FLABEL; 1900 } 1901 ; 1902 1903 asm_statement: /* GCC extension */ 1904 T_ASM T_LPAREN read_until_rparen T_SEMI { 1905 setasm(); 1906 } 1907 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1908 setasm(); 1909 } 1910 | T_ASM error 1911 ; 1912 1913 read_until_rparen: /* helper for 'asm_statement' */ 1914 /* empty */ { 1915 read_until_rparen(); 1916 } 1917 ; 1918 1919 translation_unit: /* C99 6.9 */ 1920 external_declaration 1921 | translation_unit external_declaration 1922 ; 1923 1924 external_declaration: /* C99 6.9 */ 1925 function_definition { 1926 global_clean_up_decl(false); 1927 clear_warning_flags(); 1928 } 1929 | top_level_declaration { 1930 global_clean_up_decl(false); 1931 clear_warning_flags(); 1932 } 1933 | asm_statement /* GCC extension */ 1934 | T_SEMI { /* GCC extension */ 1935 /* 1936 * TODO: Only allow this in GCC mode, not in plain C99. 1937 * This is one of the top 10 warnings in the NetBSD build. 1938 */ 1939 if (!allow_trad && !allow_c99) { 1940 /* empty declaration */ 1941 error(0); 1942 } else if (allow_c90) { 1943 /* empty declaration */ 1944 warning(0); 1945 } 1946 } 1947 ; 1948 1949 /* 1950 * On the top level, lint allows several forms of declarations that it doesn't 1951 * allow in functions. For example, a single ';' is an empty declaration and 1952 * is supported by some compilers, but in a function it would be an empty 1953 * statement, not a declaration. This makes a difference in C90 mode, where 1954 * a statement must not be followed by a declaration. 1955 * 1956 * See 'declaration' for all other declarations. 1957 */ 1958 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1959 begin_type end_type notype_init_declarators T_SEMI { 1960 /* TODO: Make this an error in C99 mode as well. */ 1961 if (!allow_trad && !allow_c99) { 1962 /* old style declaration; add 'int' */ 1963 error(1); 1964 } else if (allow_c90) { 1965 /* old style declaration; add 'int' */ 1966 warning(1); 1967 } 1968 } 1969 | declaration 1970 | error T_SEMI { 1971 global_clean_up(); 1972 } 1973 | error T_RBRACE { 1974 global_clean_up(); 1975 } 1976 ; 1977 1978 function_definition: /* C99 6.9.1 */ 1979 func_declarator { 1980 if ($1->s_type->t_tspec != FUNC) { 1981 /* syntax error '%s' */ 1982 error(249, yytext); 1983 YYERROR; 1984 } 1985 if ($1->s_type->t_typedef) { 1986 /* ()-less function definition */ 1987 error(64); 1988 YYERROR; 1989 } 1990 funcdef($1); 1991 block_level++; 1992 begin_declaration_level(DK_OLD_STYLE_ARG); 1993 if (lwarn == LWARN_NONE) 1994 $1->s_used = true; 1995 } arg_declaration_list_opt { 1996 end_declaration_level(); 1997 block_level--; 1998 check_func_lint_directives(); 1999 check_func_old_style_arguments(); 2000 begin_control_statement(CS_FUNCTION_BODY); 2001 } compound_statement { 2002 funcend(); 2003 end_control_statement(CS_FUNCTION_BODY); 2004 } 2005 ; 2006 2007 func_declarator: 2008 begin_type end_type notype_declarator { 2009 if (!allow_trad) { 2010 /* old style declaration; add 'int' */ 2011 error(1); 2012 } 2013 $$ = $3; 2014 } 2015 | begin_type_declmods end_type notype_declarator { 2016 if (!allow_trad) { 2017 /* old style declaration; add 'int' */ 2018 error(1); 2019 } 2020 $$ = $3; 2021 } 2022 | begin_type_declaration_specifiers end_type type_declarator { 2023 $$ = $3; 2024 } 2025 ; 2026 2027 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2028 /* empty */ 2029 | arg_declaration_list 2030 ; 2031 2032 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2033 arg_declaration 2034 | arg_declaration_list arg_declaration 2035 /* XXX or better "arg_declaration error" ? */ 2036 | error 2037 ; 2038 2039 /* 2040 * "arg_declaration" is separated from "declaration" because it 2041 * needs other error handling. 2042 */ 2043 arg_declaration: 2044 begin_type_declmods end_type T_SEMI { 2045 /* empty declaration */ 2046 warning(2); 2047 } 2048 | begin_type_declmods end_type notype_init_declarators T_SEMI 2049 | begin_type_declaration_specifiers end_type T_SEMI { 2050 if (!dcs->d_nonempty_decl) { 2051 /* empty declaration */ 2052 warning(2); 2053 } else { 2054 /* '%s' declared in argument declaration list */ 2055 warning(3, type_name(dcs->d_type)); 2056 } 2057 } 2058 | begin_type_declaration_specifiers end_type 2059 type_init_declarators T_SEMI { 2060 if (dcs->d_nonempty_decl) { 2061 /* '%s' declared in argument declaration list */ 2062 warning(3, type_name(dcs->d_type)); 2063 } 2064 } 2065 | begin_type_declmods error 2066 | begin_type_declaration_specifiers error 2067 ; 2068 2069 gcc_attribute_list_opt: 2070 /* empty */ 2071 | gcc_attribute_list 2072 ; 2073 2074 gcc_attribute_list: 2075 gcc_attribute 2076 | gcc_attribute_list gcc_attribute 2077 ; 2078 2079 gcc_attribute: 2080 T_ATTRIBUTE T_LPAREN T_LPAREN { 2081 in_gcc_attribute = true; 2082 } gcc_attribute_spec_list { 2083 in_gcc_attribute = false; 2084 } T_RPAREN T_RPAREN 2085 ; 2086 2087 gcc_attribute_spec_list: 2088 gcc_attribute_spec 2089 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2090 ; 2091 2092 gcc_attribute_spec: 2093 /* empty */ 2094 | T_AT_ALWAYS_INLINE 2095 | T_AT_ALIAS T_LPAREN string T_RPAREN 2096 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2097 | T_AT_ALIGNED 2098 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2099 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2100 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2101 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2102 | T_AT_COLD 2103 | T_AT_COMMON 2104 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2105 | T_AT_CONSTRUCTOR 2106 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2107 | T_AT_DEPRECATED 2108 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2109 | T_AT_DESTRUCTOR 2110 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2111 | T_AT_FALLTHROUGH { 2112 fallthru(1); 2113 } 2114 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2115 constant_expr T_COMMA constant_expr T_RPAREN 2116 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2117 | T_AT_GNU_INLINE 2118 | T_AT_HOT 2119 | T_AT_MALLOC 2120 | T_AT_MAY_ALIAS 2121 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2122 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2123 | T_AT_NO_SANITIZE_THREAD 2124 | T_AT_NOINLINE 2125 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2126 | T_AT_NONNULL 2127 | T_AT_NONSTRING 2128 | T_AT_NORETURN 2129 | T_AT_NOTHROW 2130 | T_AT_NO_INSTRUMENT_FUNCTION 2131 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2132 | T_AT_OPTNONE 2133 | T_AT_PACKED { 2134 addpacked(); 2135 } 2136 | T_AT_PCS T_LPAREN string T_RPAREN 2137 | T_AT_PURE 2138 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2139 | T_AT_RETURNS_NONNULL 2140 | T_AT_RETURNS_TWICE 2141 | T_AT_SECTION T_LPAREN string T_RPAREN 2142 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2143 | T_AT_SENTINEL 2144 | T_AT_TARGET T_LPAREN string T_RPAREN 2145 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2146 | T_AT_TUNION 2147 | T_AT_UNUSED { 2148 add_attr_used(); 2149 } 2150 | T_AT_USED { 2151 add_attr_used(); 2152 } 2153 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2154 | T_AT_WARN_UNUSED_RESULT 2155 | T_AT_WEAK 2156 | T_QUAL { 2157 if ($1 != CONST) 2158 yyerror("Bad attribute"); 2159 } 2160 ; 2161 2162 gcc_attribute_bounded: 2163 T_AT_MINBYTES 2164 | T_AT_STRING 2165 | T_AT_BUFFER 2166 ; 2167 2168 gcc_attribute_format: 2169 T_AT_FORMAT_GNU_PRINTF 2170 | T_AT_FORMAT_PRINTF 2171 | T_AT_FORMAT_SCANF 2172 | T_AT_FORMAT_STRFMON 2173 | T_AT_FORMAT_STRFTIME 2174 | T_AT_FORMAT_SYSLOG 2175 ; 2176 2177 sys: 2178 /* empty */ { 2179 $$ = in_system_header; 2180 } 2181 ; 2182 2183 %% 2184 2185 /* ARGSUSED */ 2186 int 2187 yyerror(const char *msg) 2188 { 2189 /* syntax error '%s' */ 2190 error(249, yytext); 2191 if (++sytxerr >= 5) 2192 norecover(); 2193 return 0; 2194 } 2195 2196 #if YYDEBUG && (YYBYACC || YYBISON) 2197 static const char * 2198 cgram_to_string(int token, YYSTYPE val) 2199 { 2200 2201 switch (token) { 2202 case T_INCDEC: 2203 case T_MULTIPLICATIVE: 2204 case T_ADDITIVE: 2205 case T_SHIFT: 2206 case T_RELATIONAL: 2207 case T_EQUALITY: 2208 case T_OPASSIGN: 2209 return modtab[val.y_op].m_name; 2210 case T_SCLASS: 2211 return scl_name(val.y_scl); 2212 case T_TYPE: 2213 case T_STRUCT_OR_UNION: 2214 return tspec_name(val.y_tspec); 2215 case T_QUAL: 2216 return tqual_name(val.y_tqual); 2217 case T_NAME: 2218 return val.y_name->sb_name; 2219 default: 2220 return "<none>"; 2221 } 2222 } 2223 #endif 2224 2225 #if YYDEBUG && YYBISON 2226 static inline void 2227 cgram_print(FILE *output, int token, YYSTYPE val) 2228 { 2229 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2230 } 2231 #endif 2232 2233 static void 2234 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2235 { 2236 declare(decl, initflg, renaming); 2237 if (renaming != NULL) 2238 freeyyv(&renaming, T_NAME); 2239 } 2240 2241 /* 2242 * Discard all input tokens up to and including the next 2243 * unmatched right paren 2244 */ 2245 static void 2246 read_until_rparen(void) 2247 { 2248 int level; 2249 2250 if (yychar < 0) 2251 yychar = yylex(); 2252 freeyyv(&yylval, yychar); 2253 2254 level = 1; 2255 while (yychar != T_RPAREN || --level > 0) { 2256 if (yychar == T_LPAREN) { 2257 level++; 2258 } else if (yychar <= 0) { 2259 break; 2260 } 2261 freeyyv(&yylval, yychar = yylex()); 2262 } 2263 2264 yyclearin; 2265 } 2266 2267 static sym_t * 2268 symbolrename(sym_t *s, sbuf_t *sb) 2269 { 2270 if (sb != NULL) 2271 s->s_rename = sb->sb_name; 2272 return s; 2273 } 2274
Indexes created Thu Oct 02 14:10:14 GMT 2025