cgram.y revision 1.415
1 %{ 2 /* $NetBSD: cgram.y,v 1.415 2022/05/12 20:57:49 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 1.415 2022/05/12 20:57:49 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 lint_assert(olwarn == LWARN_BAD); 87 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 88 olwarn = lwarn; 89 } 90 91 static void 92 RESTORE_WARN_FLAGS(const char *file, size_t line) 93 { 94 if (olwarn != LWARN_BAD) { 95 lwarn = olwarn; 96 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 97 olwarn = LWARN_BAD; 98 } else 99 CLEAR_WARN_FLAGS(file, line); 100 } 101 #else 102 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 103 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 104 #define RESTORE_WARN_FLAGS(f, l) \ 105 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 106 #endif 107 108 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 109 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 110 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 111 112 /* unbind the anonymous struct members from the struct */ 113 static void 114 anonymize(sym_t *s) 115 { 116 for ( ; s != NULL; s = s->s_next) 117 s->u.s_member.sm_sou_type = NULL; 118 } 119 120 #if YYDEBUG && (YYBYACC || YYBISON) 121 #define YYSTYPE_TOSTRING cgram_to_string 122 #endif 123 #if YYDEBUG && YYBISON 124 #define YYPRINT cgram_print 125 #endif 126 127 %} 128 129 %expect 129 130 131 %union { 132 val_t *y_val; 133 sbuf_t *y_name; 134 sym_t *y_sym; 135 op_t y_op; 136 scl_t y_scl; 137 tspec_t y_tspec; 138 tqual_t y_tqual; 139 type_t *y_type; 140 tnode_t *y_tnode; 141 range_t y_range; 142 strg_t *y_string; 143 qual_ptr *y_qual_ptr; 144 bool y_seen_statement; 145 struct generic_association *y_generic; 146 struct array_size y_array_size; 147 bool y_in_system_header; 148 }; 149 150 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 151 %token T_POINT T_ARROW 152 %token T_COMPLEMENT T_LOGNOT 153 %token <y_op> T_INCDEC 154 %token T_SIZEOF 155 %token T_BUILTIN_OFFSETOF 156 %token T_TYPEOF 157 %token T_EXTENSION 158 %token T_ALIGNAS 159 %token T_ALIGNOF 160 %token T_ASTERISK 161 %token <y_op> T_MULTIPLICATIVE 162 %token <y_op> T_ADDITIVE 163 %token <y_op> T_SHIFT 164 %token <y_op> T_RELATIONAL 165 %token <y_op> T_EQUALITY 166 %token T_AMPER 167 %token T_BITXOR 168 %token T_BITOR 169 %token T_LOGAND 170 %token T_LOGOR 171 %token T_QUEST 172 %token T_COLON 173 %token T_ASSIGN 174 %token <y_op> T_OPASSIGN 175 %token T_COMMA 176 %token T_SEMI 177 %token T_ELLIPSIS 178 %token T_REAL 179 %token T_IMAG 180 %token T_GENERIC 181 %token T_NORETURN 182 183 /* storage classes (extern, static, auto, register and typedef) */ 184 %token <y_scl> T_SCLASS 185 186 /* 187 * predefined type keywords (char, int, short, long, unsigned, signed, 188 * float, double, void); see T_TYPENAME for types from typedef 189 */ 190 %token <y_tspec> T_TYPE 191 192 /* qualifiers (const, volatile, restrict, _Thread_local) */ 193 %token <y_tqual> T_QUAL 194 195 /* struct or union */ 196 %token <y_tspec> T_STRUCT_OR_UNION 197 198 /* remaining keywords */ 199 %token T_ASM 200 %token T_BREAK 201 %token T_CASE 202 %token T_CONTINUE 203 %token T_DEFAULT 204 %token T_DO 205 %token T_ELSE 206 %token T_ENUM 207 %token T_FOR 208 %token T_GOTO 209 %token T_IF 210 %token T_PACKED 211 %token T_RETURN 212 %token T_SWITCH 213 %token T_SYMBOLRENAME 214 %token T_WHILE 215 %token T_STATIC_ASSERT 216 217 %token T_ATTRIBUTE 218 %token T_AT_ALIAS 219 %token T_AT_ALIGNED 220 %token T_AT_ALLOC_SIZE 221 %token T_AT_ALWAYS_INLINE 222 %token T_AT_BOUNDED 223 %token T_AT_BUFFER 224 %token T_AT_COLD 225 %token T_AT_COMMON 226 %token T_AT_CONSTRUCTOR 227 %token T_AT_DEPRECATED 228 %token T_AT_DESTRUCTOR 229 %token T_AT_DISABLE_SANITIZER_INSTRUMENTATION 230 %token T_AT_FALLTHROUGH 231 %token T_AT_FORMAT 232 %token T_AT_FORMAT_ARG 233 %token T_AT_FORMAT_GNU_PRINTF 234 %token T_AT_FORMAT_PRINTF 235 %token T_AT_FORMAT_SCANF 236 %token T_AT_FORMAT_STRFMON 237 %token T_AT_FORMAT_STRFTIME 238 %token T_AT_FORMAT_SYSLOG 239 %token T_AT_GNU_INLINE 240 %token T_AT_HOT 241 %token T_AT_MALLOC 242 %token T_AT_MAY_ALIAS 243 %token T_AT_MINBYTES 244 %token T_AT_MODE 245 %token T_AT_NO_SANITIZE 246 %token T_AT_NO_SANITIZE_THREAD 247 %token T_AT_NOINLINE 248 %token T_AT_NONNULL 249 %token T_AT_NONSTRING 250 %token T_AT_NORETURN 251 %token T_AT_NOTHROW 252 %token T_AT_NO_INSTRUMENT_FUNCTION 253 %token T_AT_OPTIMIZE 254 %token T_AT_OPTNONE 255 %token T_AT_PACKED 256 %token T_AT_PCS 257 %token T_AT_PURE 258 %token T_AT_REGPARM 259 %token T_AT_RETURNS_NONNULL 260 %token T_AT_RETURNS_TWICE 261 %token T_AT_SECTION 262 %token T_AT_SENTINEL 263 %token T_AT_STRING 264 %token T_AT_TARGET 265 %token T_AT_TLS_MODEL 266 %token T_AT_TUNION 267 %token T_AT_UNUSED 268 %token T_AT_USED 269 %token T_AT_VISIBILITY 270 %token T_AT_WARN_UNUSED_RESULT 271 %token T_AT_WEAK 272 273 %left T_THEN 274 %left T_ELSE 275 %right T_QUEST T_COLON 276 %left T_LOGOR 277 %left T_LOGAND 278 %left T_BITOR 279 %left T_BITXOR 280 %left T_AMPER 281 %left T_EQUALITY 282 %left T_RELATIONAL 283 %left T_SHIFT 284 %left T_ADDITIVE 285 %left T_ASTERISK T_MULTIPLICATIVE 286 287 %token <y_name> T_NAME 288 %token <y_name> T_TYPENAME 289 %token <y_val> T_CON 290 %token <y_string> T_STRING 291 292 %type <y_sym> identifier_sym 293 %type <y_name> identifier 294 %type <y_string> string 295 296 %type <y_tnode> primary_expression 297 %type <y_tnode> generic_selection 298 %type <y_generic> generic_assoc_list 299 %type <y_generic> generic_association 300 %type <y_tnode> postfix_expression 301 %type <y_tnode> gcc_statement_expr_list 302 %type <y_tnode> gcc_statement_expr_item 303 %type <y_op> point_or_arrow 304 %type <y_tnode> argument_expression_list 305 %type <y_tnode> unary_expression 306 %type <y_tnode> cast_expression 307 %type <y_tnode> conditional_expression 308 %type <y_tnode> assignment_expression 309 %type <y_tnode> expression_opt 310 %type <y_tnode> expression 311 %type <y_tnode> constant_expr 312 313 %type <y_type> begin_type_typespec 314 %type <y_type> type_specifier 315 %type <y_type> notype_type_specifier 316 %type <y_type> struct_or_union_specifier 317 %type <y_tspec> struct_or_union 318 %type <y_sym> braced_struct_declaration_list 319 %type <y_sym> struct_declaration_list_with_rbrace 320 %type <y_sym> struct_declaration_list 321 %type <y_sym> struct_declaration 322 %type <y_sym> notype_struct_declarators 323 %type <y_sym> type_struct_declarators 324 %type <y_sym> notype_struct_declarator 325 %type <y_sym> type_struct_declarator 326 %type <y_type> enum_specifier 327 %type <y_sym> enum_declaration 328 %type <y_sym> enums_with_opt_comma 329 %type <y_sym> enumerator_list 330 %type <y_sym> enumerator 331 %type <y_qual_ptr> type_qualifier 332 %type <y_qual_ptr> pointer 333 %type <y_qual_ptr> asterisk 334 %type <y_qual_ptr> type_qualifier_list_opt 335 %type <y_qual_ptr> type_qualifier_list 336 %type <y_sym> notype_declarator 337 %type <y_sym> type_declarator 338 %type <y_sym> notype_direct_declarator 339 %type <y_sym> type_direct_declarator 340 %type <y_sym> type_param_declarator 341 %type <y_sym> notype_param_declarator 342 %type <y_sym> direct_param_declarator 343 %type <y_sym> direct_notype_param_declarator 344 %type <y_sym> param_list 345 %type <y_array_size> array_size_opt 346 %type <y_tnode> array_size 347 %type <y_sym> identifier_list 348 %type <y_type> type_name 349 %type <y_sym> abstract_declaration 350 %type <y_sym> abstract_declarator 351 %type <y_sym> direct_abstract_declarator 352 %type <y_sym> abstract_decl_param_list 353 %type <y_sym> vararg_parameter_type_list 354 %type <y_sym> parameter_type_list 355 %type <y_sym> parameter_declaration 356 %type <y_range> range 357 %type <y_name> asm_or_symbolrename_opt 358 359 %type <y_seen_statement> block_item_list 360 %type <y_seen_statement> block_item 361 %type <y_tnode> do_while_expr 362 %type <y_sym> func_declarator 363 %type <y_in_system_header> sys 364 365 %{ 366 #if YYDEBUG && YYBISON 367 static inline void cgram_print(FILE *, int, YYSTYPE); 368 #endif 369 %} 370 371 %% 372 373 program: 374 /* empty */ { 375 /* TODO: Make this an error in C99 mode as well. */ 376 if (!allow_trad && !allow_c99) { 377 /* empty translation unit */ 378 error(272); 379 } else if (allow_c90) { 380 /* empty translation unit */ 381 warning(272); 382 } 383 } 384 | translation_unit 385 ; 386 387 identifier_sym: /* helper for struct/union/enum */ 388 identifier { 389 $$ = getsym($1); 390 } 391 ; 392 393 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 394 identifier: 395 T_NAME { 396 debug_step("cgram: name '%s'", $1->sb_name); 397 $$ = $1; 398 } 399 | T_TYPENAME { 400 debug_step("cgram: typename '%s'", $1->sb_name); 401 $$ = $1; 402 } 403 ; 404 405 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 406 string: 407 T_STRING 408 | string T_STRING { 409 if (!allow_c90) { 410 /* concatenated strings are illegal in traditional C */ 411 warning(219); 412 } 413 $$ = cat_strings($1, $2); 414 } 415 ; 416 417 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 418 primary_expression: 419 T_NAME { 420 bool sys_name, sys_next; 421 sys_name = in_system_header; 422 if (yychar < 0) 423 yychar = yylex(); 424 sys_next = in_system_header; 425 in_system_header = sys_name; 426 $$ = build_name(getsym($1), yychar == T_LPAREN); 427 in_system_header = sys_next; 428 } 429 | T_CON { 430 $$ = build_constant(gettyp($1->v_tspec), $1); 431 } 432 | string { 433 $$ = build_string($1); 434 } 435 | T_LPAREN expression T_RPAREN { 436 if ($2 != NULL) 437 $2->tn_parenthesized = true; 438 $$ = $2; 439 } 440 | generic_selection 441 /* GCC primary-expression, see c_parser_postfix_expression */ 442 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 443 symtyp = FMEMBER; 444 $$ = build_offsetof($3, getsym($5)); 445 } 446 ; 447 448 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 449 generic_selection: 450 T_GENERIC T_LPAREN assignment_expression T_COMMA 451 generic_assoc_list T_RPAREN { 452 /* generic selection requires C11 or later */ 453 c11ism(345); 454 $$ = build_generic_selection($3, $5); 455 } 456 ; 457 458 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 459 generic_assoc_list: 460 generic_association 461 | generic_assoc_list T_COMMA generic_association { 462 $3->ga_prev = $1; 463 $$ = $3; 464 } 465 ; 466 467 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 468 generic_association: 469 type_name T_COLON assignment_expression { 470 $$ = block_zero_alloc(sizeof(*$$)); 471 $$->ga_arg = $1; 472 $$->ga_result = $3; 473 } 474 | T_DEFAULT T_COLON assignment_expression { 475 $$ = block_zero_alloc(sizeof(*$$)); 476 $$->ga_arg = NULL; 477 $$->ga_result = $3; 478 } 479 ; 480 481 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 482 postfix_expression: 483 primary_expression 484 | postfix_expression T_LBRACK sys expression T_RBRACK { 485 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 486 } 487 | postfix_expression T_LPAREN sys T_RPAREN { 488 $$ = build_function_call($1, $3, NULL); 489 } 490 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 491 $$ = build_function_call($1, $3, $4); 492 } 493 | postfix_expression point_or_arrow sys T_NAME { 494 $$ = build_member_access($1, $2, $3, $4); 495 } 496 | postfix_expression T_INCDEC sys { 497 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 498 } 499 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 500 sym_t *tmp = mktempsym($2); 501 begin_initialization(tmp); 502 cgram_declare(tmp, true, NULL); 503 } init_lbrace initializer_list comma_opt init_rbrace { 504 if (!allow_c99) 505 /* compound literals are a C99/GCC extension */ 506 gnuism(319); 507 $$ = build_name(*current_initsym(), false); 508 end_initialization(); 509 } 510 | T_LPAREN compound_statement_lbrace { 511 begin_statement_expr(); 512 } gcc_statement_expr_list { 513 do_statement_expr($4); 514 } compound_statement_rbrace T_RPAREN { 515 $$ = end_statement_expr(); 516 } 517 ; 518 519 comma_opt: /* helper for 'postfix_expression' */ 520 /* empty */ 521 | T_COMMA 522 ; 523 524 /* 525 * The inner part of a GCC statement-expression of the form ({ ... }). 526 * 527 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 528 */ 529 gcc_statement_expr_list: 530 gcc_statement_expr_item 531 | gcc_statement_expr_list gcc_statement_expr_item { 532 $$ = $2; 533 } 534 ; 535 536 gcc_statement_expr_item: 537 declaration_or_error { 538 clear_warning_flags(); 539 $$ = NULL; 540 } 541 | non_expr_statement { 542 $$ = expr_alloc_tnode(); 543 $$->tn_type = gettyp(VOID); 544 } 545 | expression T_SEMI { 546 if ($1 == NULL) { /* in case of syntax errors */ 547 $$ = expr_alloc_tnode(); 548 $$->tn_type = gettyp(VOID); 549 } else { 550 /* XXX: do that only on the last name */ 551 if ($1->tn_op == NAME) 552 $1->tn_sym->s_used = true; 553 expr($1, false, false, false, false); 554 seen_fallthrough = false; 555 $$ = $1; 556 } 557 } 558 ; 559 560 point_or_arrow: /* helper for 'postfix_expression' */ 561 T_POINT { 562 symtyp = FMEMBER; 563 $$ = POINT; 564 } 565 | T_ARROW { 566 symtyp = FMEMBER; 567 $$ = ARROW; 568 } 569 ; 570 571 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 572 argument_expression_list: 573 assignment_expression { 574 $$ = build_function_argument(NULL, $1); 575 } 576 | argument_expression_list T_COMMA assignment_expression { 577 $$ = build_function_argument($1, $3); 578 } 579 ; 580 581 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 582 unary_expression: 583 postfix_expression 584 | T_INCDEC sys unary_expression { 585 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 586 } 587 | T_AMPER sys cast_expression { 588 $$ = build_unary(ADDR, $2, $3); 589 } 590 | T_ASTERISK sys cast_expression { 591 $$ = build_unary(INDIR, $2, $3); 592 } 593 | T_ADDITIVE sys cast_expression { 594 if (!allow_c90 && $1 == PLUS) { 595 /* unary + is illegal in traditional C */ 596 warning(100); 597 } 598 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 599 } 600 | T_COMPLEMENT sys cast_expression { 601 $$ = build_unary(COMPL, $2, $3); 602 } 603 | T_LOGNOT sys cast_expression { 604 $$ = build_unary(NOT, $2, $3); 605 } 606 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 607 $$ = build_unary(REAL, $2, $3); 608 } 609 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 610 $$ = build_unary(IMAG, $2, $3); 611 } 612 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 613 $$ = $2; 614 } 615 | T_SIZEOF unary_expression { 616 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 617 if ($$ != NULL) 618 check_expr_misc($2, 619 false, false, false, false, false, true); 620 } 621 | T_SIZEOF T_LPAREN type_name T_RPAREN { 622 $$ = build_sizeof($3); 623 } 624 | T_ALIGNOF unary_expression { 625 /* non type argument to alignof is a GCC extension */ 626 gnuism(349); 627 lint_assert($2 != NULL); 628 $$ = build_alignof($2->tn_type); 629 } 630 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 631 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 632 /* TODO: c11ism */ 633 $$ = build_alignof($3); 634 } 635 ; 636 637 /* The rule 'unary_operator' is inlined into unary_expression. */ 638 639 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 640 cast_expression: 641 unary_expression 642 | T_LPAREN type_name T_RPAREN cast_expression { 643 $$ = cast($4, $2); 644 } 645 ; 646 647 expression_opt: 648 /* empty */ { 649 $$ = NULL; 650 } 651 | expression 652 ; 653 654 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 655 /* 'conditional_expression' also implements 'additive_expression'. */ 656 /* 'conditional_expression' also implements 'shift_expression'. */ 657 /* 'conditional_expression' also implements 'relational_expression'. */ 658 /* 'conditional_expression' also implements 'equality_expression'. */ 659 /* 'conditional_expression' also implements 'AND_expression'. */ 660 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 661 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 662 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 663 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 664 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 665 conditional_expression: 666 cast_expression 667 | conditional_expression T_ASTERISK sys conditional_expression { 668 $$ = build_binary($1, MULT, $3, $4); 669 } 670 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 671 $$ = build_binary($1, $2, $3, $4); 672 } 673 | conditional_expression T_ADDITIVE sys conditional_expression { 674 $$ = build_binary($1, $2, $3, $4); 675 } 676 | conditional_expression T_SHIFT sys conditional_expression { 677 $$ = build_binary($1, $2, $3, $4); 678 } 679 | conditional_expression T_RELATIONAL sys conditional_expression { 680 $$ = build_binary($1, $2, $3, $4); 681 } 682 | conditional_expression T_EQUALITY sys conditional_expression { 683 $$ = build_binary($1, $2, $3, $4); 684 } 685 | conditional_expression T_AMPER sys conditional_expression { 686 $$ = build_binary($1, BITAND, $3, $4); 687 } 688 | conditional_expression T_BITXOR sys conditional_expression { 689 $$ = build_binary($1, BITXOR, $3, $4); 690 } 691 | conditional_expression T_BITOR sys conditional_expression { 692 $$ = build_binary($1, BITOR, $3, $4); 693 } 694 | conditional_expression T_LOGAND sys conditional_expression { 695 $$ = build_binary($1, LOGAND, $3, $4); 696 } 697 | conditional_expression T_LOGOR sys conditional_expression { 698 $$ = build_binary($1, LOGOR, $3, $4); 699 } 700 | conditional_expression T_QUEST sys 701 expression T_COLON sys conditional_expression { 702 $$ = build_binary($1, QUEST, $3, 703 build_binary($4, COLON, $6, $7)); 704 } 705 ; 706 707 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 708 assignment_expression: 709 conditional_expression 710 | unary_expression T_ASSIGN sys assignment_expression { 711 $$ = build_binary($1, ASSIGN, $3, $4); 712 } 713 | unary_expression T_OPASSIGN sys assignment_expression { 714 $$ = build_binary($1, $2, $3, $4); 715 } 716 ; 717 718 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 719 expression: 720 assignment_expression 721 | expression T_COMMA sys assignment_expression { 722 $$ = build_binary($1, COMMA, $3, $4); 723 } 724 ; 725 726 constant_expr_list_opt: /* helper for gcc_attribute */ 727 /* empty */ 728 | constant_expr_list 729 ; 730 731 constant_expr_list: /* helper for gcc_attribute */ 732 constant_expr 733 | constant_expr_list T_COMMA constant_expr 734 ; 735 736 constant_expr: /* C99 6.6 */ 737 conditional_expression 738 ; 739 740 declaration_or_error: 741 declaration 742 | error T_SEMI 743 ; 744 745 declaration: /* C99 6.7 */ 746 begin_type_declmods end_type T_SEMI { 747 if (dcs->d_scl == TYPEDEF) { 748 /* typedef declares no type name */ 749 warning(72); 750 } else { 751 /* empty declaration */ 752 warning(2); 753 } 754 } 755 | begin_type_declmods end_type notype_init_declarators T_SEMI { 756 if (dcs->d_scl == TYPEDEF) { 757 /* syntax error '%s' */ 758 error(249, "missing base type for typedef"); 759 } else { 760 /* old style declaration; add 'int' */ 761 error(1); 762 } 763 } 764 | begin_type_declaration_specifiers end_type T_SEMI { 765 if (dcs->d_scl == TYPEDEF) { 766 /* typedef declares no type name */ 767 warning(72); 768 } else if (!dcs->d_nonempty_decl) { 769 /* empty declaration */ 770 warning(2); 771 } 772 } 773 | begin_type_declaration_specifiers end_type 774 type_init_declarators T_SEMI 775 | static_assert_declaration 776 ; 777 778 begin_type_declaration_specifiers: /* see C99 6.7 */ 779 begin_type_typespec { 780 add_type($1); 781 } 782 | begin_type_declmods type_specifier { 783 add_type($2); 784 } 785 | type_attribute begin_type_declaration_specifiers 786 | begin_type_declaration_specifiers declmod 787 | begin_type_declaration_specifiers notype_type_specifier { 788 add_type($2); 789 } 790 ; 791 792 begin_type_declmods: /* see C99 6.7 */ 793 begin_type T_QUAL { 794 add_qualifier($2); 795 } 796 | begin_type T_SCLASS { 797 add_storage_class($2); 798 } 799 | begin_type_declmods declmod 800 ; 801 802 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 803 begin_type_specifier_qualifier_list_postfix 804 | type_attribute_list begin_type_specifier_qualifier_list_postfix 805 ; 806 807 begin_type_specifier_qualifier_list_postfix: 808 begin_type_typespec { 809 add_type($1); 810 } 811 | begin_type_qualifier_list type_specifier { 812 add_type($2); 813 } 814 | begin_type_specifier_qualifier_list_postfix T_QUAL { 815 add_qualifier($2); 816 } 817 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 818 add_type($2); 819 } 820 | begin_type_specifier_qualifier_list_postfix type_attribute 821 ; 822 823 begin_type_typespec: 824 begin_type notype_type_specifier { 825 $$ = $2; 826 } 827 | begin_type T_TYPENAME { 828 $$ = getsym($2)->s_type; 829 } 830 ; 831 832 begin_type_qualifier_list: 833 begin_type T_QUAL { 834 add_qualifier($2); 835 } 836 | begin_type_qualifier_list T_QUAL { 837 add_qualifier($2); 838 } 839 ; 840 841 declmod: 842 T_QUAL { 843 add_qualifier($1); 844 } 845 | T_SCLASS { 846 add_storage_class($1); 847 } 848 | type_attribute_list 849 ; 850 851 type_attribute_list_opt: 852 /* empty */ 853 | type_attribute_list 854 ; 855 856 type_attribute_list: 857 type_attribute 858 | type_attribute_list type_attribute 859 ; 860 861 type_attribute_opt: 862 /* empty */ 863 | type_attribute 864 ; 865 866 type_attribute: /* See C11 6.7 declaration-specifiers */ 867 gcc_attribute 868 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 869 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 870 | T_PACKED { 871 addpacked(); 872 } 873 | T_NORETURN 874 ; 875 876 begin_type: 877 /* empty */ { 878 begin_type(); 879 } 880 ; 881 882 end_type: 883 /* empty */ { 884 end_type(); 885 } 886 ; 887 888 type_specifier: /* C99 6.7.2 */ 889 notype_type_specifier 890 | T_TYPENAME { 891 $$ = getsym($1)->s_type; 892 } 893 ; 894 895 notype_type_specifier: /* see C99 6.7.2 */ 896 T_TYPE { 897 $$ = gettyp($1); 898 } 899 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 900 $$ = block_dup_type($3->tn_type); 901 $$->t_typeof = true; 902 } 903 | struct_or_union_specifier { 904 end_declaration_level(); 905 $$ = $1; 906 } 907 | enum_specifier { 908 end_declaration_level(); 909 $$ = $1; 910 } 911 ; 912 913 struct_or_union_specifier: /* C99 6.7.2.1 */ 914 struct_or_union identifier_sym { 915 /* 916 * STDC requires that "struct a;" always introduces 917 * a new tag if "a" is not declared at current level 918 * 919 * yychar is valid because otherwise the parser would not 920 * have been able to decide if it must shift or reduce 921 */ 922 $$ = mktag($2, $1, false, yychar == T_SEMI); 923 } 924 | struct_or_union identifier_sym { 925 dcs->d_tagtyp = mktag($2, $1, true, false); 926 } braced_struct_declaration_list { 927 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 928 } 929 | struct_or_union { 930 dcs->d_tagtyp = mktag(NULL, $1, true, false); 931 } braced_struct_declaration_list { 932 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 933 } 934 | struct_or_union error { 935 symtyp = FVFT; 936 $$ = gettyp(INT); 937 } 938 ; 939 940 struct_or_union: /* C99 6.7.2.1 */ 941 T_STRUCT_OR_UNION { 942 symtyp = FTAG; 943 begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); 944 dcs->d_offset_in_bits = 0; 945 dcs->d_sou_align_in_bits = CHAR_SIZE; 946 $$ = $1; 947 } 948 | struct_or_union type_attribute 949 ; 950 951 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 952 struct_declaration_lbrace struct_declaration_list_with_rbrace { 953 $$ = $2; 954 } 955 ; 956 957 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 958 T_LBRACE { 959 symtyp = FVFT; 960 } 961 ; 962 963 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 964 struct_declaration_list T_RBRACE 965 | T_RBRACE { 966 /* XXX: This is not allowed by any C standard. */ 967 $$ = NULL; 968 } 969 ; 970 971 struct_declaration_list: /* C99 6.7.2.1 */ 972 struct_declaration 973 | struct_declaration_list struct_declaration { 974 $$ = lnklst($1, $2); 975 } 976 ; 977 978 struct_declaration: /* C99 6.7.2.1 */ 979 begin_type_qualifier_list end_type { 980 /* ^^ There is no check for the missing type-specifier. */ 981 /* too late, i know, but getsym() compensates it */ 982 symtyp = FMEMBER; 983 } notype_struct_declarators type_attribute_opt T_SEMI { 984 symtyp = FVFT; 985 $$ = $4; 986 } 987 | begin_type_specifier_qualifier_list end_type { 988 symtyp = FMEMBER; 989 } type_struct_declarators type_attribute_opt T_SEMI { 990 symtyp = FVFT; 991 $$ = $4; 992 } 993 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 994 /* syntax error '%s' */ 995 error(249, "member without type"); 996 $$ = NULL; 997 } 998 | begin_type_specifier_qualifier_list end_type type_attribute_opt 999 T_SEMI { 1000 symtyp = FVFT; 1001 if (!allow_c11 && !allow_gcc) 1002 /* anonymous struct/union members is a C11 feature */ 1003 warning(49); 1004 if (is_struct_or_union(dcs->d_type->t_tspec)) { 1005 $$ = dcs->d_type->t_str->sou_first_member; 1006 /* add all the members of the anonymous struct/union */ 1007 anonymize($$); 1008 } else { 1009 /* syntax error '%s' */ 1010 error(249, "unnamed member"); 1011 $$ = NULL; 1012 } 1013 } 1014 | static_assert_declaration { 1015 $$ = NULL; 1016 } 1017 | error T_SEMI { 1018 symtyp = FVFT; 1019 $$ = NULL; 1020 } 1021 ; 1022 1023 notype_struct_declarators: 1024 notype_struct_declarator { 1025 $$ = declarator_1_struct_union($1); 1026 } 1027 | notype_struct_declarators { 1028 symtyp = FMEMBER; 1029 } T_COMMA type_struct_declarator { 1030 $$ = lnklst($1, declarator_1_struct_union($4)); 1031 } 1032 ; 1033 1034 type_struct_declarators: 1035 type_struct_declarator { 1036 $$ = declarator_1_struct_union($1); 1037 } 1038 | type_struct_declarators { 1039 symtyp = FMEMBER; 1040 } T_COMMA type_struct_declarator { 1041 $$ = lnklst($1, declarator_1_struct_union($4)); 1042 } 1043 ; 1044 1045 notype_struct_declarator: 1046 notype_declarator 1047 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1048 $$ = bitfield($1, to_int_constant($3, true)); 1049 } 1050 | { 1051 symtyp = FVFT; 1052 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1053 $$ = bitfield(NULL, to_int_constant($3, true)); 1054 } 1055 ; 1056 1057 type_struct_declarator: 1058 type_declarator 1059 | type_declarator T_COLON constant_expr { 1060 $$ = bitfield($1, to_int_constant($3, true)); 1061 } 1062 | { 1063 symtyp = FVFT; 1064 } T_COLON constant_expr { 1065 $$ = bitfield(NULL, to_int_constant($3, true)); 1066 } 1067 ; 1068 1069 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1070 enum_specifier: /* C99 6.7.2.2 */ 1071 enum gcc_attribute_list_opt identifier_sym { 1072 $$ = mktag($3, ENUM, false, false); 1073 } 1074 | enum gcc_attribute_list_opt identifier_sym { 1075 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1076 } enum_declaration /*gcc_attribute_list_opt*/ { 1077 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1078 } 1079 | enum gcc_attribute_list_opt { 1080 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1081 } enum_declaration /*gcc_attribute_list_opt*/ { 1082 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1083 } 1084 | enum error { 1085 symtyp = FVFT; 1086 $$ = gettyp(INT); 1087 } 1088 ; 1089 1090 enum: /* helper for C99 6.7.2.2 */ 1091 T_ENUM { 1092 symtyp = FTAG; 1093 begin_declaration_level(DK_ENUM_CONST); 1094 } 1095 ; 1096 1097 enum_declaration: /* helper for C99 6.7.2.2 */ 1098 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1099 $$ = $2; 1100 } 1101 ; 1102 1103 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1104 T_LBRACE { 1105 symtyp = FVFT; 1106 enumval = 0; 1107 } 1108 ; 1109 1110 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1111 enumerator_list 1112 | enumerator_list T_COMMA { 1113 if (!allow_c99 && !allow_trad) { 1114 /* trailing ',' prohibited in enum declaration */ 1115 error(54); 1116 } else { 1117 /* trailing ',' prohibited in enum declaration */ 1118 c99ism(54); 1119 } 1120 $$ = $1; 1121 } 1122 ; 1123 1124 enumerator_list: /* C99 6.7.2.2 */ 1125 enumerator 1126 | enumerator_list T_COMMA enumerator { 1127 $$ = lnklst($1, $3); 1128 } 1129 | error { 1130 $$ = NULL; 1131 } 1132 ; 1133 1134 enumerator: /* C99 6.7.2.2 */ 1135 identifier_sym gcc_attribute_list_opt { 1136 $$ = enumeration_constant($1, enumval, true); 1137 } 1138 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1139 $$ = enumeration_constant($1, to_int_constant($4, true), 1140 false); 1141 } 1142 ; 1143 1144 type_qualifier: /* C99 6.7.3 */ 1145 T_QUAL { 1146 $$ = xcalloc(1, sizeof(*$$)); 1147 if ($1 == CONST) 1148 $$->p_const = true; 1149 if ($1 == VOLATILE) 1150 $$->p_volatile = true; 1151 } 1152 ; 1153 1154 pointer: /* C99 6.7.5 */ 1155 asterisk type_qualifier_list_opt { 1156 $$ = merge_qualified_pointer($1, $2); 1157 } 1158 | asterisk type_qualifier_list_opt pointer { 1159 $$ = merge_qualified_pointer($1, $2); 1160 $$ = merge_qualified_pointer($$, $3); 1161 } 1162 ; 1163 1164 asterisk: /* helper for 'pointer' */ 1165 T_ASTERISK { 1166 $$ = xcalloc(1, sizeof(*$$)); 1167 $$->p_pointer = true; 1168 } 1169 ; 1170 1171 type_qualifier_list_opt: /* see C99 6.7.5 */ 1172 /* empty */ { 1173 $$ = NULL; 1174 } 1175 | type_qualifier_list 1176 ; 1177 1178 type_qualifier_list: /* C99 6.7.5 */ 1179 type_qualifier 1180 | type_qualifier_list type_qualifier { 1181 $$ = merge_qualified_pointer($1, $2); 1182 } 1183 ; 1184 1185 /* 1186 * For an explanation of 'notype' in the following rules, see 1187 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1188 */ 1189 1190 notype_init_declarators: 1191 notype_init_declarator 1192 | notype_init_declarators T_COMMA type_init_declarator 1193 ; 1194 1195 type_init_declarators: 1196 type_init_declarator 1197 | type_init_declarators T_COMMA type_init_declarator 1198 ; 1199 1200 notype_init_declarator: 1201 notype_declarator asm_or_symbolrename_opt { 1202 cgram_declare($1, false, $2); 1203 check_size($1); 1204 } 1205 | notype_declarator asm_or_symbolrename_opt { 1206 begin_initialization($1); 1207 cgram_declare($1, true, $2); 1208 } T_ASSIGN initializer { 1209 check_size($1); 1210 end_initialization(); 1211 } 1212 ; 1213 1214 type_init_declarator: 1215 type_declarator asm_or_symbolrename_opt { 1216 cgram_declare($1, false, $2); 1217 check_size($1); 1218 } 1219 | type_declarator asm_or_symbolrename_opt { 1220 begin_initialization($1); 1221 cgram_declare($1, true, $2); 1222 } T_ASSIGN initializer { 1223 check_size($1); 1224 end_initialization(); 1225 } 1226 ; 1227 1228 notype_declarator: 1229 notype_direct_declarator 1230 | pointer notype_direct_declarator { 1231 $$ = add_pointer($2, $1); 1232 } 1233 ; 1234 1235 type_declarator: 1236 type_direct_declarator 1237 | pointer type_direct_declarator { 1238 $$ = add_pointer($2, $1); 1239 } 1240 ; 1241 1242 notype_direct_declarator: 1243 type_attribute_list_opt T_NAME { 1244 $$ = declarator_name(getsym($2)); 1245 } 1246 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1247 $$ = $3; 1248 } 1249 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1250 $$ = add_array($1, $3.has_dim, $3.dim); 1251 } 1252 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1253 $$ = add_function(symbolrename($1, $3), $2); 1254 end_declaration_level(); 1255 block_level--; 1256 } 1257 | notype_direct_declarator type_attribute 1258 ; 1259 1260 type_direct_declarator: 1261 type_attribute_list_opt identifier { 1262 $$ = declarator_name(getsym($2)); 1263 } 1264 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1265 $$ = $3; 1266 } 1267 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1268 $$ = add_array($1, $3.has_dim, $3.dim); 1269 } 1270 | type_direct_declarator param_list asm_or_symbolrename_opt { 1271 $$ = add_function(symbolrename($1, $3), $2); 1272 end_declaration_level(); 1273 block_level--; 1274 } 1275 | type_direct_declarator type_attribute 1276 ; 1277 1278 /* 1279 * The two distinct rules type_param_declarator and notype_param_declarator 1280 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1281 * always treated as a typename, not an argument name. For example, after 1282 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1283 * "f(int (double));", not "f(int a);". 1284 */ 1285 type_param_declarator: 1286 direct_param_declarator 1287 | pointer direct_param_declarator { 1288 $$ = add_pointer($2, $1); 1289 } 1290 ; 1291 1292 notype_param_declarator: 1293 direct_notype_param_declarator 1294 | pointer direct_notype_param_declarator { 1295 $$ = add_pointer($2, $1); 1296 } 1297 ; 1298 1299 direct_param_declarator: 1300 identifier type_attribute_list { 1301 $$ = declarator_name(getsym($1)); 1302 } 1303 | identifier { 1304 $$ = declarator_name(getsym($1)); 1305 } 1306 | T_LPAREN notype_param_declarator T_RPAREN { 1307 $$ = $2; 1308 } 1309 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1310 gcc_attribute_list_opt { 1311 $$ = add_array($1, $3.has_dim, $3.dim); 1312 } 1313 | direct_param_declarator param_list asm_or_symbolrename_opt { 1314 $$ = add_function(symbolrename($1, $3), $2); 1315 end_declaration_level(); 1316 block_level--; 1317 } 1318 ; 1319 1320 direct_notype_param_declarator: 1321 identifier { 1322 $$ = declarator_name(getsym($1)); 1323 } 1324 | T_LPAREN notype_param_declarator T_RPAREN { 1325 $$ = $2; 1326 } 1327 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1328 $$ = add_array($1, $3.has_dim, $3.dim); 1329 } 1330 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1331 $$ = add_function(symbolrename($1, $3), $2); 1332 end_declaration_level(); 1333 block_level--; 1334 } 1335 ; 1336 1337 param_list: 1338 id_list_lparen identifier_list T_RPAREN { 1339 $$ = $2; 1340 } 1341 | abstract_decl_param_list 1342 ; 1343 1344 id_list_lparen: 1345 T_LPAREN { 1346 block_level++; 1347 begin_declaration_level(DK_PROTO_ARG); 1348 } 1349 ; 1350 1351 array_size_opt: 1352 /* empty */ { 1353 $$.has_dim = false; 1354 $$.dim = 0; 1355 } 1356 | T_ASTERISK { 1357 /* since C99; variable length array of unspecified size */ 1358 $$.has_dim = false; /* TODO: maybe change to true */ 1359 $$.dim = 0; /* just as a placeholder */ 1360 } 1361 | array_size { 1362 $$.has_dim = true; 1363 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1364 } 1365 ; 1366 1367 array_size: 1368 type_qualifier_list_opt T_SCLASS constant_expr { 1369 /* C11 6.7.6.3p7 */ 1370 if ($2 != STATIC) 1371 yyerror("Bad attribute"); 1372 /* static array size is a C11 extension */ 1373 c11ism(343); 1374 $$ = $3; 1375 } 1376 | T_QUAL { 1377 /* C11 6.7.6.2 */ 1378 if ($1 != RESTRICT) 1379 yyerror("Bad attribute"); 1380 $$ = NULL; 1381 } 1382 | constant_expr 1383 ; 1384 1385 identifier_list: /* C99 6.7.5 */ 1386 T_NAME { 1387 $$ = old_style_function_name(getsym($1)); 1388 } 1389 | identifier_list T_COMMA T_NAME { 1390 $$ = lnklst($1, old_style_function_name(getsym($3))); 1391 } 1392 | identifier_list error 1393 ; 1394 1395 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1396 type_name: /* C99 6.7.6 */ 1397 { 1398 begin_declaration_level(DK_ABSTRACT); 1399 } abstract_declaration { 1400 end_declaration_level(); 1401 $$ = $2->s_type; 1402 } 1403 ; 1404 1405 abstract_declaration: /* specific to lint */ 1406 begin_type_qualifier_list end_type { 1407 $$ = declare_1_abstract(abstract_name()); 1408 } 1409 | begin_type_specifier_qualifier_list end_type { 1410 $$ = declare_1_abstract(abstract_name()); 1411 } 1412 | begin_type_qualifier_list end_type abstract_declarator { 1413 $$ = declare_1_abstract($3); 1414 } 1415 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1416 $$ = declare_1_abstract($3); 1417 } 1418 ; 1419 1420 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1421 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1422 abstract_declarator: 1423 pointer { 1424 $$ = add_pointer(abstract_name(), $1); 1425 } 1426 | direct_abstract_declarator 1427 | pointer direct_abstract_declarator { 1428 $$ = add_pointer($2, $1); 1429 } 1430 | type_attribute_list direct_abstract_declarator { 1431 $$ = $2; 1432 } 1433 | pointer type_attribute_list direct_abstract_declarator { 1434 $$ = add_pointer($3, $1); 1435 } 1436 ; 1437 1438 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1439 direct_abstract_declarator: 1440 /* TODO: sort rules according to C99 */ 1441 T_LPAREN abstract_declarator T_RPAREN { 1442 $$ = $2; 1443 } 1444 | T_LBRACK array_size_opt T_RBRACK { 1445 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1446 } 1447 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1448 $$ = add_array($1, $3.has_dim, $3.dim); 1449 } 1450 | abstract_decl_param_list asm_or_symbolrename_opt { 1451 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1452 end_declaration_level(); 1453 block_level--; 1454 } 1455 | direct_abstract_declarator abstract_decl_param_list 1456 asm_or_symbolrename_opt { 1457 $$ = add_function(symbolrename($1, $3), $2); 1458 end_declaration_level(); 1459 block_level--; 1460 } 1461 | direct_abstract_declarator type_attribute_list 1462 ; 1463 1464 abstract_decl_param_list: /* specific to lint */ 1465 abstract_decl_lparen T_RPAREN type_attribute_opt { 1466 $$ = NULL; 1467 } 1468 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1469 type_attribute_opt { 1470 dcs->d_proto = true; 1471 $$ = $2; 1472 } 1473 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1474 $$ = NULL; 1475 } 1476 ; 1477 1478 abstract_decl_lparen: /* specific to lint */ 1479 T_LPAREN { 1480 block_level++; 1481 begin_declaration_level(DK_PROTO_ARG); 1482 } 1483 ; 1484 1485 vararg_parameter_type_list: /* specific to lint */ 1486 parameter_type_list 1487 | parameter_type_list T_COMMA T_ELLIPSIS { 1488 dcs->d_vararg = true; 1489 $$ = $1; 1490 } 1491 | T_ELLIPSIS { 1492 /* TODO: C99 6.7.5 makes this an error as well. */ 1493 if (!allow_trad && !allow_c99) { 1494 /* ANSI C requires formal parameter before '...' */ 1495 error(84); 1496 } else if (allow_c90) { 1497 /* ANSI C requires formal parameter before '...' */ 1498 warning(84); 1499 } 1500 dcs->d_vararg = true; 1501 $$ = NULL; 1502 } 1503 ; 1504 1505 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1506 parameter_type_list: 1507 parameter_declaration 1508 | parameter_type_list T_COMMA parameter_declaration { 1509 $$ = lnklst($1, $3); 1510 } 1511 ; 1512 1513 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1514 parameter_declaration: 1515 begin_type_declmods end_type { 1516 /* ^^ There is no check for the missing type-specifier. */ 1517 $$ = declare_argument(abstract_name(), false); 1518 } 1519 | begin_type_declaration_specifiers end_type { 1520 $$ = declare_argument(abstract_name(), false); 1521 } 1522 | begin_type_declmods end_type notype_param_declarator { 1523 /* ^^ There is no check for the missing type-specifier. */ 1524 $$ = declare_argument($3, false); 1525 } 1526 /* 1527 * type_param_declarator is needed because of following conflict: 1528 * "typedef int a; f(int (a));" could be parsed as 1529 * "function with argument a of type int", or 1530 * "function with an abstract argument of type function". 1531 * This grammar realizes the second case. 1532 */ 1533 | begin_type_declaration_specifiers end_type type_param_declarator { 1534 $$ = declare_argument($3, false); 1535 } 1536 | begin_type_declmods end_type abstract_declarator { 1537 /* ^^ There is no check for the missing type-specifier. */ 1538 $$ = declare_argument($3, false); 1539 } 1540 | begin_type_declaration_specifiers end_type abstract_declarator { 1541 $$ = declare_argument($3, false); 1542 } 1543 ; 1544 1545 initializer: /* C99 6.7.8 "Initialization" */ 1546 assignment_expression { 1547 init_expr($1); 1548 } 1549 | init_lbrace init_rbrace { 1550 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1551 } 1552 | init_lbrace initializer_list comma_opt init_rbrace 1553 /* XXX: What is this error handling for? */ 1554 | error 1555 ; 1556 1557 initializer_list: /* C99 6.7.8 "Initialization" */ 1558 initializer_list_item 1559 | initializer_list T_COMMA initializer_list_item 1560 ; 1561 1562 initializer_list_item: /* helper */ 1563 designation initializer 1564 | initializer 1565 ; 1566 1567 designation: /* C99 6.7.8 "Initialization" */ 1568 begin_designation designator_list T_ASSIGN 1569 | identifier T_COLON { 1570 /* GCC style struct or union member name in initializer */ 1571 gnuism(315); 1572 begin_designation(); 1573 add_designator_member($1); 1574 } 1575 ; 1576 1577 begin_designation: /* lint-specific helper */ 1578 /* empty */ { 1579 begin_designation(); 1580 } 1581 ; 1582 1583 designator_list: /* C99 6.7.8 "Initialization" */ 1584 designator 1585 | designator_list designator 1586 ; 1587 1588 designator: /* C99 6.7.8 "Initialization" */ 1589 T_LBRACK range T_RBRACK { 1590 if (!allow_c99) 1591 /* array initializer with designators is a C99 ... */ 1592 warning(321); 1593 add_designator_subscript($2); 1594 } 1595 | T_POINT identifier { 1596 if (!allow_c99) 1597 /* struct or union member name in initializer is ... */ 1598 warning(313); 1599 add_designator_member($2); 1600 } 1601 ; 1602 1603 static_assert_declaration: 1604 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1605 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1606 ; 1607 1608 range: 1609 constant_expr { 1610 $$.lo = to_int_constant($1, true); 1611 $$.hi = $$.lo; 1612 } 1613 | constant_expr T_ELLIPSIS constant_expr { 1614 $$.lo = to_int_constant($1, true); 1615 $$.hi = to_int_constant($3, true); 1616 /* initialization with '[a...b]' is a GCC extension */ 1617 gnuism(340); 1618 } 1619 ; 1620 1621 init_lbrace: /* helper */ 1622 T_LBRACE { 1623 init_lbrace(); 1624 } 1625 ; 1626 1627 init_rbrace: /* helper */ 1628 T_RBRACE { 1629 init_rbrace(); 1630 } 1631 ; 1632 1633 asm_or_symbolrename_opt: /* GCC extensions */ 1634 /* empty */ { 1635 $$ = NULL; 1636 } 1637 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1638 freeyyv(&$3, T_STRING); 1639 $$ = NULL; 1640 } 1641 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1642 $$ = $3; 1643 } 1644 ; 1645 1646 statement: /* C99 6.8 */ 1647 expression_statement 1648 | non_expr_statement 1649 ; 1650 1651 non_expr_statement: /* helper for C99 6.8 */ 1652 gcc_attribute /* ((__fallthrough__)) */ T_SEMI 1653 | labeled_statement 1654 | compound_statement 1655 | selection_statement 1656 | iteration_statement 1657 | jump_statement { 1658 seen_fallthrough = false; 1659 } 1660 | asm_statement 1661 ; 1662 1663 labeled_statement: /* C99 6.8.1 */ 1664 label gcc_attribute_list_opt statement 1665 ; 1666 1667 label: 1668 T_NAME T_COLON { 1669 symtyp = FLABEL; 1670 named_label(getsym($1)); 1671 } 1672 | T_CASE constant_expr T_COLON { 1673 case_label($2); 1674 seen_fallthrough = true; 1675 } 1676 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1677 /* XXX: We don't fill all cases */ 1678 case_label($2); 1679 seen_fallthrough = true; 1680 } 1681 | T_DEFAULT T_COLON { 1682 default_label(); 1683 seen_fallthrough = true; 1684 } 1685 ; 1686 1687 compound_statement: /* C99 6.8.2 */ 1688 compound_statement_lbrace compound_statement_rbrace 1689 | compound_statement_lbrace block_item_list compound_statement_rbrace 1690 ; 1691 1692 compound_statement_lbrace: 1693 T_LBRACE { 1694 block_level++; 1695 mem_block_level++; 1696 begin_declaration_level(DK_AUTO); 1697 } 1698 ; 1699 1700 compound_statement_rbrace: 1701 T_RBRACE { 1702 end_declaration_level(); 1703 level_free_all(mem_block_level); 1704 mem_block_level--; 1705 block_level--; 1706 seen_fallthrough = false; 1707 } 1708 ; 1709 1710 block_item_list: /* C99 6.8.2 */ 1711 block_item 1712 | block_item_list block_item { 1713 if ($1 && !$2) 1714 /* declarations after statements is a C99 feature */ 1715 c99ism(327); 1716 $$ = $1 || $2; 1717 } 1718 ; 1719 1720 block_item: /* C99 6.8.2 */ 1721 declaration_or_error { 1722 $$ = false; 1723 restore_warning_flags(); 1724 } 1725 | statement { 1726 $$ = true; 1727 restore_warning_flags(); 1728 } 1729 ; 1730 1731 expression_statement: /* C99 6.8.3 */ 1732 expression T_SEMI { 1733 expr($1, false, false, false, false); 1734 seen_fallthrough = false; 1735 } 1736 | T_SEMI { 1737 check_statement_reachable(); 1738 seen_fallthrough = false; 1739 } 1740 ; 1741 1742 selection_statement: /* C99 6.8.4 */ 1743 if_without_else %prec T_THEN { 1744 save_warning_flags(); 1745 if2(); 1746 if3(false); 1747 } 1748 | if_without_else T_ELSE { 1749 save_warning_flags(); 1750 if2(); 1751 } statement { 1752 clear_warning_flags(); 1753 if3(true); 1754 } 1755 | if_without_else T_ELSE error { 1756 clear_warning_flags(); 1757 if3(false); 1758 } 1759 | switch_expr statement { 1760 clear_warning_flags(); 1761 switch2(); 1762 } 1763 | switch_expr error { 1764 clear_warning_flags(); 1765 switch2(); 1766 } 1767 ; 1768 1769 if_without_else: /* see C99 6.8.4 */ 1770 if_expr statement 1771 | if_expr error 1772 ; 1773 1774 if_expr: /* see C99 6.8.4 */ 1775 T_IF T_LPAREN expression T_RPAREN { 1776 if1($3); 1777 clear_warning_flags(); 1778 } 1779 ; 1780 1781 switch_expr: /* see C99 6.8.4 */ 1782 T_SWITCH T_LPAREN expression T_RPAREN { 1783 switch1($3); 1784 clear_warning_flags(); 1785 } 1786 ; 1787 1788 iteration_statement: /* C99 6.8.5 */ 1789 while_expr statement { 1790 clear_warning_flags(); 1791 while2(); 1792 } 1793 | while_expr error { 1794 clear_warning_flags(); 1795 while2(); 1796 } 1797 | do_statement do_while_expr { 1798 do2($2); 1799 seen_fallthrough = false; 1800 } 1801 | do error { 1802 clear_warning_flags(); 1803 do2(NULL); 1804 } 1805 | for_exprs statement { 1806 clear_warning_flags(); 1807 for2(); 1808 end_declaration_level(); 1809 block_level--; 1810 } 1811 | for_exprs error { 1812 clear_warning_flags(); 1813 for2(); 1814 end_declaration_level(); 1815 block_level--; 1816 } 1817 ; 1818 1819 while_expr: /* see C99 6.8.5 */ 1820 T_WHILE T_LPAREN expression T_RPAREN { 1821 while1($3); 1822 clear_warning_flags(); 1823 } 1824 ; 1825 1826 do_statement: /* see C99 6.8.5 */ 1827 do statement { 1828 clear_warning_flags(); 1829 } 1830 ; 1831 1832 do: /* see C99 6.8.5 */ 1833 T_DO { 1834 do1(); 1835 } 1836 ; 1837 1838 do_while_expr: /* see C99 6.8.5 */ 1839 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1840 $$ = $3; 1841 } 1842 ; 1843 1844 for_start: /* see C99 6.8.5 */ 1845 T_FOR T_LPAREN { 1846 begin_declaration_level(DK_AUTO); 1847 block_level++; 1848 } 1849 ; 1850 1851 for_exprs: /* see C99 6.8.5 */ 1852 for_start 1853 begin_type_declaration_specifiers end_type 1854 notype_init_declarators T_SEMI 1855 expression_opt T_SEMI 1856 expression_opt T_RPAREN { 1857 /* variable declaration in for loop */ 1858 c99ism(325); 1859 for1(NULL, $6, $8); 1860 clear_warning_flags(); 1861 } 1862 | for_start 1863 expression_opt T_SEMI 1864 expression_opt T_SEMI 1865 expression_opt T_RPAREN { 1866 for1($2, $4, $6); 1867 clear_warning_flags(); 1868 } 1869 ; 1870 1871 jump_statement: /* C99 6.8.6 */ 1872 goto identifier T_SEMI { 1873 do_goto(getsym($2)); 1874 } 1875 | goto error T_SEMI { 1876 symtyp = FVFT; 1877 } 1878 | T_CONTINUE T_SEMI { 1879 do_continue(); 1880 } 1881 | T_BREAK T_SEMI { 1882 do_break(); 1883 } 1884 | T_RETURN sys T_SEMI { 1885 do_return($2, NULL); 1886 } 1887 | T_RETURN sys expression T_SEMI { 1888 do_return($2, $3); 1889 } 1890 ; 1891 1892 goto: /* see C99 6.8.6 */ 1893 T_GOTO { 1894 symtyp = FLABEL; 1895 } 1896 ; 1897 1898 asm_statement: /* GCC extension */ 1899 T_ASM T_LPAREN read_until_rparen T_SEMI { 1900 setasm(); 1901 } 1902 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1903 setasm(); 1904 } 1905 | T_ASM error 1906 ; 1907 1908 read_until_rparen: /* helper for 'asm_statement' */ 1909 /* empty */ { 1910 read_until_rparen(); 1911 } 1912 ; 1913 1914 translation_unit: /* C99 6.9 */ 1915 external_declaration 1916 | translation_unit external_declaration 1917 ; 1918 1919 external_declaration: /* C99 6.9 */ 1920 function_definition { 1921 global_clean_up_decl(false); 1922 clear_warning_flags(); 1923 } 1924 | top_level_declaration { 1925 global_clean_up_decl(false); 1926 clear_warning_flags(); 1927 } 1928 | asm_statement /* GCC extension */ 1929 | T_SEMI { /* GCC extension */ 1930 /* 1931 * TODO: Only allow this in GCC mode, not in plain C99. 1932 * This is one of the top 10 warnings in the NetBSD build. 1933 */ 1934 if (!allow_trad && !allow_c99) { 1935 /* empty declaration */ 1936 error(0); 1937 } else if (allow_c90) { 1938 /* empty declaration */ 1939 warning(0); 1940 } 1941 } 1942 ; 1943 1944 /* 1945 * On the top level, lint allows several forms of declarations that it doesn't 1946 * allow in functions. For example, a single ';' is an empty declaration and 1947 * is supported by some compilers, but in a function it would be an empty 1948 * statement, not a declaration. This makes a difference in C90 mode, where 1949 * a statement must not be followed by a declaration. 1950 * 1951 * See 'declaration' for all other declarations. 1952 */ 1953 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1954 begin_type end_type notype_init_declarators T_SEMI { 1955 /* TODO: Make this an error in C99 mode as well. */ 1956 if (!allow_trad && !allow_c99) { 1957 /* old style declaration; add 'int' */ 1958 error(1); 1959 } else if (allow_c90) { 1960 /* old style declaration; add 'int' */ 1961 warning(1); 1962 } 1963 } 1964 | declaration 1965 | error T_SEMI { 1966 global_clean_up(); 1967 } 1968 | error T_RBRACE { 1969 global_clean_up(); 1970 } 1971 ; 1972 1973 function_definition: /* C99 6.9.1 */ 1974 func_declarator { 1975 if ($1->s_type->t_tspec != FUNC) { 1976 /* syntax error '%s' */ 1977 error(249, yytext); 1978 YYERROR; 1979 } 1980 if ($1->s_type->t_typedef) { 1981 /* ()-less function definition */ 1982 error(64); 1983 YYERROR; 1984 } 1985 funcdef($1); 1986 block_level++; 1987 begin_declaration_level(DK_OLD_STYLE_ARG); 1988 if (lwarn == LWARN_NONE) 1989 $1->s_used = true; 1990 } arg_declaration_list_opt { 1991 end_declaration_level(); 1992 block_level--; 1993 check_func_lint_directives(); 1994 check_func_old_style_arguments(); 1995 begin_control_statement(CS_FUNCTION_BODY); 1996 } compound_statement { 1997 funcend(); 1998 end_control_statement(CS_FUNCTION_BODY); 1999 } 2000 ; 2001 2002 func_declarator: 2003 begin_type end_type notype_declarator { 2004 if (!allow_trad) { 2005 /* old style declaration; add 'int' */ 2006 error(1); 2007 } 2008 $$ = $3; 2009 } 2010 | begin_type_declmods end_type notype_declarator { 2011 if (!allow_trad) { 2012 /* old style declaration; add 'int' */ 2013 error(1); 2014 } 2015 $$ = $3; 2016 } 2017 | begin_type_declaration_specifiers end_type type_declarator { 2018 $$ = $3; 2019 } 2020 ; 2021 2022 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2023 /* empty */ 2024 | arg_declaration_list 2025 ; 2026 2027 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2028 arg_declaration 2029 | arg_declaration_list arg_declaration 2030 /* XXX or better "arg_declaration error" ? */ 2031 | error 2032 ; 2033 2034 /* 2035 * "arg_declaration" is separated from "declaration" because it 2036 * needs other error handling. 2037 */ 2038 arg_declaration: 2039 begin_type_declmods end_type T_SEMI { 2040 /* empty declaration */ 2041 warning(2); 2042 } 2043 | begin_type_declmods end_type notype_init_declarators T_SEMI 2044 | begin_type_declaration_specifiers end_type T_SEMI { 2045 if (!dcs->d_nonempty_decl) { 2046 /* empty declaration */ 2047 warning(2); 2048 } else { 2049 /* '%s' declared in argument declaration list */ 2050 warning(3, type_name(dcs->d_type)); 2051 } 2052 } 2053 | begin_type_declaration_specifiers end_type 2054 type_init_declarators T_SEMI { 2055 if (dcs->d_nonempty_decl) { 2056 /* '%s' declared in argument declaration list */ 2057 warning(3, type_name(dcs->d_type)); 2058 } 2059 } 2060 | begin_type_declmods error 2061 | begin_type_declaration_specifiers error 2062 ; 2063 2064 gcc_attribute_list_opt: 2065 /* empty */ 2066 | gcc_attribute_list 2067 ; 2068 2069 gcc_attribute_list: 2070 gcc_attribute 2071 | gcc_attribute_list gcc_attribute 2072 ; 2073 2074 gcc_attribute: 2075 T_ATTRIBUTE T_LPAREN T_LPAREN { 2076 in_gcc_attribute = true; 2077 } gcc_attribute_spec_list { 2078 in_gcc_attribute = false; 2079 } T_RPAREN T_RPAREN 2080 ; 2081 2082 gcc_attribute_spec_list: 2083 gcc_attribute_spec 2084 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2085 ; 2086 2087 gcc_attribute_spec: 2088 /* empty */ 2089 | T_AT_ALWAYS_INLINE 2090 | T_AT_ALIAS T_LPAREN string T_RPAREN 2091 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2092 | T_AT_ALIGNED 2093 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2094 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2095 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2096 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2097 | T_AT_COLD 2098 | T_AT_COMMON 2099 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2100 | T_AT_CONSTRUCTOR 2101 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2102 | T_AT_DEPRECATED 2103 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2104 | T_AT_DESTRUCTOR 2105 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2106 | T_AT_FALLTHROUGH { 2107 fallthru(1); 2108 } 2109 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2110 constant_expr T_COMMA constant_expr T_RPAREN 2111 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2112 | T_AT_GNU_INLINE 2113 | T_AT_HOT 2114 | T_AT_MALLOC 2115 | T_AT_MAY_ALIAS 2116 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2117 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2118 | T_AT_NO_SANITIZE_THREAD 2119 | T_AT_NOINLINE 2120 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2121 | T_AT_NONNULL 2122 | T_AT_NONSTRING 2123 | T_AT_NORETURN 2124 | T_AT_NOTHROW 2125 | T_AT_NO_INSTRUMENT_FUNCTION 2126 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2127 | T_AT_OPTNONE 2128 | T_AT_PACKED { 2129 addpacked(); 2130 } 2131 | T_AT_PCS T_LPAREN string T_RPAREN 2132 | T_AT_PURE 2133 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2134 | T_AT_RETURNS_NONNULL 2135 | T_AT_RETURNS_TWICE 2136 | T_AT_SECTION T_LPAREN string T_RPAREN 2137 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2138 | T_AT_SENTINEL 2139 | T_AT_TARGET T_LPAREN string T_RPAREN 2140 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2141 | T_AT_TUNION 2142 | T_AT_UNUSED { 2143 add_attr_used(); 2144 } 2145 | T_AT_USED { 2146 add_attr_used(); 2147 } 2148 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2149 | T_AT_WARN_UNUSED_RESULT 2150 | T_AT_WEAK 2151 | T_QUAL { 2152 if ($1 != CONST) 2153 yyerror("Bad attribute"); 2154 } 2155 ; 2156 2157 gcc_attribute_bounded: 2158 T_AT_MINBYTES 2159 | T_AT_STRING 2160 | T_AT_BUFFER 2161 ; 2162 2163 gcc_attribute_format: 2164 T_AT_FORMAT_GNU_PRINTF 2165 | T_AT_FORMAT_PRINTF 2166 | T_AT_FORMAT_SCANF 2167 | T_AT_FORMAT_STRFMON 2168 | T_AT_FORMAT_STRFTIME 2169 | T_AT_FORMAT_SYSLOG 2170 ; 2171 2172 sys: 2173 /* empty */ { 2174 $$ = in_system_header; 2175 } 2176 ; 2177 2178 %% 2179 2180 /* ARGSUSED */ 2181 int 2182 yyerror(const char *msg) 2183 { 2184 /* syntax error '%s' */ 2185 error(249, yytext); 2186 if (++sytxerr >= 5) 2187 norecover(); 2188 return 0; 2189 } 2190 2191 #if YYDEBUG && (YYBYACC || YYBISON) 2192 static const char * 2193 cgram_to_string(int token, YYSTYPE val) 2194 { 2195 2196 switch (token) { 2197 case T_INCDEC: 2198 case T_MULTIPLICATIVE: 2199 case T_ADDITIVE: 2200 case T_SHIFT: 2201 case T_RELATIONAL: 2202 case T_EQUALITY: 2203 case T_OPASSIGN: 2204 return modtab[val.y_op].m_name; 2205 case T_SCLASS: 2206 return scl_name(val.y_scl); 2207 case T_TYPE: 2208 case T_STRUCT_OR_UNION: 2209 return tspec_name(val.y_tspec); 2210 case T_QUAL: 2211 return tqual_name(val.y_tqual); 2212 case T_NAME: 2213 return val.y_name->sb_name; 2214 default: 2215 return "<none>"; 2216 } 2217 } 2218 #endif 2219 2220 #if YYDEBUG && YYBISON 2221 static inline void 2222 cgram_print(FILE *output, int token, YYSTYPE val) 2223 { 2224 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2225 } 2226 #endif 2227 2228 static void 2229 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2230 { 2231 declare(decl, initflg, renaming); 2232 if (renaming != NULL) 2233 freeyyv(&renaming, T_NAME); 2234 } 2235 2236 /* 2237 * Discard all input tokens up to and including the next 2238 * unmatched right paren 2239 */ 2240 static void 2241 read_until_rparen(void) 2242 { 2243 int level; 2244 2245 if (yychar < 0) 2246 yychar = yylex(); 2247 freeyyv(&yylval, yychar); 2248 2249 level = 1; 2250 while (yychar != T_RPAREN || --level > 0) { 2251 if (yychar == T_LPAREN) { 2252 level++; 2253 } else if (yychar <= 0) { 2254 break; 2255 } 2256 freeyyv(&yylval, yychar = yylex()); 2257 } 2258 2259 yyclearin; 2260 } 2261 2262 static sym_t * 2263 symbolrename(sym_t *s, sbuf_t *sb) 2264 { 2265 if (sb != NULL) 2266 s->s_rename = sb->sb_name; 2267 return s; 2268 } 2269
Indexes created Fri Oct 03 02:09:57 GMT 2025