cgram.y revision 1.418
1 %{ 2 /* $NetBSD: cgram.y,v 1.418 2022/05/26 12:47:20 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 1.418 2022/05/26 12:47:20 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 /* ARGSUSED */ 75 static void 76 clear_warning_flags_loc(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 /* ARGSUSED */ 84 static void 85 save_warning_flags_loc(const char *file, size_t line) 86 { 87 /* 88 * There used to be an assertion for 'olwarn == LWARN_BAD' here, 89 * but that triggered for the following code: 90 * 91 * void function(int x) { if (x > 0) if (x > 1) return; } 92 * 93 * It didn't trigger if the inner 'if' was enclosed in braces though. 94 * 95 * TODO: If actually needed, add support for nested suppression of 96 * warnings. 97 */ 98 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 99 olwarn = lwarn; 100 } 101 102 /* ARGSUSED */ 103 static void 104 restore_warning_flags_loc(const char *file, size_t line) 105 { 106 if (olwarn != LWARN_BAD) { 107 lwarn = olwarn; 108 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 109 /* 110 * Do not set 'olwarn = LWARN_BAD' here, to avoid triggering 111 * the assertion in save_warning_flags_loc. 112 */ 113 } else 114 clear_warning_flags_loc(file, line); 115 } 116 117 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 118 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 119 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 120 121 /* unbind the anonymous struct members from the struct */ 122 static void 123 anonymize(sym_t *s) 124 { 125 for ( ; s != NULL; s = s->s_next) 126 s->u.s_member.sm_sou_type = NULL; 127 } 128 129 #if YYDEBUG && (YYBYACC || YYBISON) 130 #define YYSTYPE_TOSTRING cgram_to_string 131 #endif 132 #if YYDEBUG && YYBISON 133 #define YYPRINT cgram_print 134 #endif 135 136 %} 137 138 %expect 129 139 140 %union { 141 val_t *y_val; 142 sbuf_t *y_name; 143 sym_t *y_sym; 144 op_t y_op; 145 scl_t y_scl; 146 tspec_t y_tspec; 147 tqual_t y_tqual; 148 type_t *y_type; 149 tnode_t *y_tnode; 150 range_t y_range; 151 strg_t *y_string; 152 qual_ptr *y_qual_ptr; 153 bool y_seen_statement; 154 struct generic_association *y_generic; 155 struct array_size y_array_size; 156 bool y_in_system_header; 157 }; 158 159 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 160 %token T_POINT T_ARROW 161 %token T_COMPLEMENT T_LOGNOT 162 %token <y_op> T_INCDEC 163 %token T_SIZEOF 164 %token T_BUILTIN_OFFSETOF 165 %token T_TYPEOF 166 %token T_EXTENSION 167 %token T_ALIGNAS 168 %token T_ALIGNOF 169 %token T_ASTERISK 170 %token <y_op> T_MULTIPLICATIVE 171 %token <y_op> T_ADDITIVE 172 %token <y_op> T_SHIFT 173 %token <y_op> T_RELATIONAL 174 %token <y_op> T_EQUALITY 175 %token T_AMPER 176 %token T_BITXOR 177 %token T_BITOR 178 %token T_LOGAND 179 %token T_LOGOR 180 %token T_QUEST 181 %token T_COLON 182 %token T_ASSIGN 183 %token <y_op> T_OPASSIGN 184 %token T_COMMA 185 %token T_SEMI 186 %token T_ELLIPSIS 187 %token T_REAL 188 %token T_IMAG 189 %token T_GENERIC 190 %token T_NORETURN 191 192 /* storage classes (extern, static, auto, register and typedef) */ 193 %token <y_scl> T_SCLASS 194 195 /* 196 * predefined type keywords (char, int, short, long, unsigned, signed, 197 * float, double, void); see T_TYPENAME for types from typedef 198 */ 199 %token <y_tspec> T_TYPE 200 201 /* qualifiers (const, volatile, restrict, _Thread_local) */ 202 %token <y_tqual> T_QUAL 203 204 /* struct or union */ 205 %token <y_tspec> T_STRUCT_OR_UNION 206 207 /* remaining keywords */ 208 %token T_ASM 209 %token T_BREAK 210 %token T_CASE 211 %token T_CONTINUE 212 %token T_DEFAULT 213 %token T_DO 214 %token T_ELSE 215 %token T_ENUM 216 %token T_FOR 217 %token T_GOTO 218 %token T_IF 219 %token T_PACKED 220 %token T_RETURN 221 %token T_SWITCH 222 %token T_SYMBOLRENAME 223 %token T_WHILE 224 %token T_STATIC_ASSERT 225 226 %token T_ATTRIBUTE 227 %token T_AT_ALIAS 228 %token T_AT_ALIGNED 229 %token T_AT_ALLOC_SIZE 230 %token T_AT_ALWAYS_INLINE 231 %token T_AT_BOUNDED 232 %token T_AT_BUFFER 233 %token T_AT_COLD 234 %token T_AT_COMMON 235 %token T_AT_CONSTRUCTOR 236 %token T_AT_DEPRECATED 237 %token T_AT_DESTRUCTOR 238 %token T_AT_DISABLE_SANITIZER_INSTRUMENTATION 239 %token T_AT_FALLTHROUGH 240 %token T_AT_FORMAT 241 %token T_AT_FORMAT_ARG 242 %token T_AT_FORMAT_GNU_PRINTF 243 %token T_AT_FORMAT_PRINTF 244 %token T_AT_FORMAT_SCANF 245 %token T_AT_FORMAT_STRFMON 246 %token T_AT_FORMAT_STRFTIME 247 %token T_AT_FORMAT_SYSLOG 248 %token T_AT_GNU_INLINE 249 %token T_AT_HOT 250 %token T_AT_MALLOC 251 %token T_AT_MAY_ALIAS 252 %token T_AT_MINBYTES 253 %token T_AT_MODE 254 %token T_AT_NO_SANITIZE 255 %token T_AT_NO_SANITIZE_THREAD 256 %token T_AT_NOINLINE 257 %token T_AT_NONNULL 258 %token T_AT_NONSTRING 259 %token T_AT_NORETURN 260 %token T_AT_NOTHROW 261 %token T_AT_NO_INSTRUMENT_FUNCTION 262 %token T_AT_OPTIMIZE 263 %token T_AT_OPTNONE 264 %token T_AT_PACKED 265 %token T_AT_PCS 266 %token T_AT_PURE 267 %token T_AT_REGPARM 268 %token T_AT_RETURNS_NONNULL 269 %token T_AT_RETURNS_TWICE 270 %token T_AT_SECTION 271 %token T_AT_SENTINEL 272 %token T_AT_STRING 273 %token T_AT_TARGET 274 %token T_AT_TLS_MODEL 275 %token T_AT_TUNION 276 %token T_AT_UNUSED 277 %token T_AT_USED 278 %token T_AT_VISIBILITY 279 %token T_AT_WARN_UNUSED_RESULT 280 %token T_AT_WEAK 281 282 %left T_THEN 283 %left T_ELSE 284 %right T_QUEST T_COLON 285 %left T_LOGOR 286 %left T_LOGAND 287 %left T_BITOR 288 %left T_BITXOR 289 %left T_AMPER 290 %left T_EQUALITY 291 %left T_RELATIONAL 292 %left T_SHIFT 293 %left T_ADDITIVE 294 %left T_ASTERISK T_MULTIPLICATIVE 295 296 %token <y_name> T_NAME 297 %token <y_name> T_TYPENAME 298 %token <y_val> T_CON 299 %token <y_string> T_STRING 300 301 %type <y_sym> identifier_sym 302 %type <y_name> identifier 303 %type <y_string> string 304 305 %type <y_tnode> primary_expression 306 %type <y_tnode> generic_selection 307 %type <y_generic> generic_assoc_list 308 %type <y_generic> generic_association 309 %type <y_tnode> postfix_expression 310 %type <y_tnode> gcc_statement_expr_list 311 %type <y_tnode> gcc_statement_expr_item 312 %type <y_op> point_or_arrow 313 %type <y_tnode> argument_expression_list 314 %type <y_tnode> unary_expression 315 %type <y_tnode> cast_expression 316 %type <y_tnode> conditional_expression 317 %type <y_tnode> assignment_expression 318 %type <y_tnode> expression_opt 319 %type <y_tnode> expression 320 %type <y_tnode> constant_expr 321 322 %type <y_type> begin_type_typespec 323 %type <y_type> type_specifier 324 %type <y_type> notype_type_specifier 325 %type <y_type> struct_or_union_specifier 326 %type <y_tspec> struct_or_union 327 %type <y_sym> braced_struct_declaration_list 328 %type <y_sym> struct_declaration_list_with_rbrace 329 %type <y_sym> struct_declaration_list 330 %type <y_sym> struct_declaration 331 %type <y_sym> notype_struct_declarators 332 %type <y_sym> type_struct_declarators 333 %type <y_sym> notype_struct_declarator 334 %type <y_sym> type_struct_declarator 335 %type <y_type> enum_specifier 336 %type <y_sym> enum_declaration 337 %type <y_sym> enums_with_opt_comma 338 %type <y_sym> enumerator_list 339 %type <y_sym> enumerator 340 %type <y_qual_ptr> type_qualifier 341 %type <y_qual_ptr> pointer 342 %type <y_qual_ptr> asterisk 343 %type <y_qual_ptr> type_qualifier_list_opt 344 %type <y_qual_ptr> type_qualifier_list 345 %type <y_sym> notype_declarator 346 %type <y_sym> type_declarator 347 %type <y_sym> notype_direct_declarator 348 %type <y_sym> type_direct_declarator 349 %type <y_sym> type_param_declarator 350 %type <y_sym> notype_param_declarator 351 %type <y_sym> direct_param_declarator 352 %type <y_sym> direct_notype_param_declarator 353 %type <y_sym> param_list 354 %type <y_array_size> array_size_opt 355 %type <y_tnode> array_size 356 %type <y_sym> identifier_list 357 %type <y_type> type_name 358 %type <y_sym> abstract_declaration 359 %type <y_sym> abstract_declarator 360 %type <y_sym> direct_abstract_declarator 361 %type <y_sym> abstract_decl_param_list 362 %type <y_sym> vararg_parameter_type_list 363 %type <y_sym> parameter_type_list 364 %type <y_sym> parameter_declaration 365 %type <y_range> range 366 %type <y_name> asm_or_symbolrename_opt 367 368 %type <y_seen_statement> block_item_list 369 %type <y_seen_statement> block_item 370 %type <y_tnode> do_while_expr 371 %type <y_sym> func_declarator 372 %type <y_in_system_header> sys 373 374 %{ 375 #if YYDEBUG && YYBISON 376 static inline void cgram_print(FILE *, int, YYSTYPE); 377 #endif 378 %} 379 380 %% 381 382 program: 383 /* empty */ { 384 /* TODO: Make this an error in C99 mode as well. */ 385 if (!allow_trad && !allow_c99) { 386 /* empty translation unit */ 387 error(272); 388 } else if (allow_c90) { 389 /* empty translation unit */ 390 warning(272); 391 } 392 } 393 | translation_unit 394 ; 395 396 identifier_sym: /* helper for struct/union/enum */ 397 identifier { 398 $$ = getsym($1); 399 } 400 ; 401 402 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 403 identifier: 404 T_NAME { 405 debug_step("cgram: name '%s'", $1->sb_name); 406 $$ = $1; 407 } 408 | T_TYPENAME { 409 debug_step("cgram: typename '%s'", $1->sb_name); 410 $$ = $1; 411 } 412 ; 413 414 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 415 string: 416 T_STRING 417 | string T_STRING { 418 if (!allow_c90) { 419 /* concatenated strings are illegal in traditional C */ 420 warning(219); 421 } 422 $$ = cat_strings($1, $2); 423 } 424 ; 425 426 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 427 primary_expression: 428 T_NAME { 429 bool sys_name, sys_next; 430 sys_name = in_system_header; 431 if (yychar < 0) 432 yychar = yylex(); 433 sys_next = in_system_header; 434 in_system_header = sys_name; 435 $$ = build_name(getsym($1), yychar == T_LPAREN); 436 in_system_header = sys_next; 437 } 438 | T_CON { 439 $$ = build_constant(gettyp($1->v_tspec), $1); 440 } 441 | string { 442 $$ = build_string($1); 443 } 444 | T_LPAREN expression T_RPAREN { 445 if ($2 != NULL) 446 $2->tn_parenthesized = true; 447 $$ = $2; 448 } 449 | generic_selection 450 /* GCC primary-expression, see c_parser_postfix_expression */ 451 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 452 symtyp = FMEMBER; 453 $$ = build_offsetof($3, getsym($5)); 454 } 455 ; 456 457 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 458 generic_selection: 459 T_GENERIC T_LPAREN assignment_expression T_COMMA 460 generic_assoc_list T_RPAREN { 461 /* generic selection requires C11 or later */ 462 c11ism(345); 463 $$ = build_generic_selection($3, $5); 464 } 465 ; 466 467 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 468 generic_assoc_list: 469 generic_association 470 | generic_assoc_list T_COMMA generic_association { 471 $3->ga_prev = $1; 472 $$ = $3; 473 } 474 ; 475 476 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 477 generic_association: 478 type_name T_COLON assignment_expression { 479 $$ = block_zero_alloc(sizeof(*$$)); 480 $$->ga_arg = $1; 481 $$->ga_result = $3; 482 } 483 | T_DEFAULT T_COLON assignment_expression { 484 $$ = block_zero_alloc(sizeof(*$$)); 485 $$->ga_arg = NULL; 486 $$->ga_result = $3; 487 } 488 ; 489 490 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 491 postfix_expression: 492 primary_expression 493 | postfix_expression T_LBRACK sys expression T_RBRACK { 494 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 495 } 496 | postfix_expression T_LPAREN sys T_RPAREN { 497 $$ = build_function_call($1, $3, NULL); 498 } 499 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 500 $$ = build_function_call($1, $3, $4); 501 } 502 | postfix_expression point_or_arrow sys T_NAME { 503 $$ = build_member_access($1, $2, $3, $4); 504 } 505 | postfix_expression T_INCDEC sys { 506 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 507 } 508 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 509 sym_t *tmp = mktempsym($2); 510 begin_initialization(tmp); 511 cgram_declare(tmp, true, NULL); 512 } init_lbrace initializer_list comma_opt init_rbrace { 513 if (!allow_c99) 514 /* compound literals are a C99/GCC extension */ 515 gnuism(319); 516 $$ = build_name(*current_initsym(), false); 517 end_initialization(); 518 } 519 | T_LPAREN compound_statement_lbrace { 520 begin_statement_expr(); 521 } gcc_statement_expr_list { 522 do_statement_expr($4); 523 } compound_statement_rbrace T_RPAREN { 524 $$ = end_statement_expr(); 525 } 526 ; 527 528 comma_opt: /* helper for 'postfix_expression' */ 529 /* empty */ 530 | T_COMMA 531 ; 532 533 /* 534 * The inner part of a GCC statement-expression of the form ({ ... }). 535 * 536 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 537 */ 538 gcc_statement_expr_list: 539 gcc_statement_expr_item 540 | gcc_statement_expr_list gcc_statement_expr_item { 541 $$ = $2; 542 } 543 ; 544 545 gcc_statement_expr_item: 546 declaration_or_error { 547 clear_warning_flags(); 548 $$ = NULL; 549 } 550 | non_expr_statement { 551 $$ = expr_alloc_tnode(); 552 $$->tn_type = gettyp(VOID); 553 } 554 | expression T_SEMI { 555 if ($1 == NULL) { /* in case of syntax errors */ 556 $$ = expr_alloc_tnode(); 557 $$->tn_type = gettyp(VOID); 558 } else { 559 /* XXX: do that only on the last name */ 560 if ($1->tn_op == NAME) 561 $1->tn_sym->s_used = true; 562 expr($1, false, false, false, false); 563 seen_fallthrough = false; 564 $$ = $1; 565 } 566 } 567 ; 568 569 point_or_arrow: /* helper for 'postfix_expression' */ 570 T_POINT { 571 symtyp = FMEMBER; 572 $$ = POINT; 573 } 574 | T_ARROW { 575 symtyp = FMEMBER; 576 $$ = ARROW; 577 } 578 ; 579 580 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 581 argument_expression_list: 582 assignment_expression { 583 $$ = build_function_argument(NULL, $1); 584 } 585 | argument_expression_list T_COMMA assignment_expression { 586 $$ = build_function_argument($1, $3); 587 } 588 ; 589 590 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 591 unary_expression: 592 postfix_expression 593 | T_INCDEC sys unary_expression { 594 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 595 } 596 | T_AMPER sys cast_expression { 597 $$ = build_unary(ADDR, $2, $3); 598 } 599 | T_ASTERISK sys cast_expression { 600 $$ = build_unary(INDIR, $2, $3); 601 } 602 | T_ADDITIVE sys cast_expression { 603 if (!allow_c90 && $1 == PLUS) { 604 /* unary + is illegal in traditional C */ 605 warning(100); 606 } 607 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 608 } 609 | T_COMPLEMENT sys cast_expression { 610 $$ = build_unary(COMPL, $2, $3); 611 } 612 | T_LOGNOT sys cast_expression { 613 $$ = build_unary(NOT, $2, $3); 614 } 615 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 616 $$ = build_unary(REAL, $2, $3); 617 } 618 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 619 $$ = build_unary(IMAG, $2, $3); 620 } 621 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 622 $$ = $2; 623 } 624 | T_SIZEOF unary_expression { 625 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 626 if ($$ != NULL) 627 check_expr_misc($2, 628 false, false, false, false, false, true); 629 } 630 | T_SIZEOF T_LPAREN type_name T_RPAREN { 631 $$ = build_sizeof($3); 632 } 633 | T_ALIGNOF unary_expression { 634 /* non type argument to alignof is a GCC extension */ 635 gnuism(349); 636 lint_assert($2 != NULL); 637 $$ = build_alignof($2->tn_type); 638 } 639 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 640 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 641 /* TODO: c11ism */ 642 $$ = build_alignof($3); 643 } 644 ; 645 646 /* The rule 'unary_operator' is inlined into unary_expression. */ 647 648 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 649 cast_expression: 650 unary_expression 651 | T_LPAREN type_name T_RPAREN cast_expression { 652 $$ = cast($4, $2); 653 } 654 ; 655 656 expression_opt: 657 /* empty */ { 658 $$ = NULL; 659 } 660 | expression 661 ; 662 663 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 664 /* 'conditional_expression' also implements 'additive_expression'. */ 665 /* 'conditional_expression' also implements 'shift_expression'. */ 666 /* 'conditional_expression' also implements 'relational_expression'. */ 667 /* 'conditional_expression' also implements 'equality_expression'. */ 668 /* 'conditional_expression' also implements 'AND_expression'. */ 669 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 670 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 671 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 672 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 673 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 674 conditional_expression: 675 cast_expression 676 | conditional_expression T_ASTERISK sys conditional_expression { 677 $$ = build_binary($1, MULT, $3, $4); 678 } 679 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 680 $$ = build_binary($1, $2, $3, $4); 681 } 682 | conditional_expression T_ADDITIVE sys conditional_expression { 683 $$ = build_binary($1, $2, $3, $4); 684 } 685 | conditional_expression T_SHIFT sys conditional_expression { 686 $$ = build_binary($1, $2, $3, $4); 687 } 688 | conditional_expression T_RELATIONAL sys conditional_expression { 689 $$ = build_binary($1, $2, $3, $4); 690 } 691 | conditional_expression T_EQUALITY sys conditional_expression { 692 $$ = build_binary($1, $2, $3, $4); 693 } 694 | conditional_expression T_AMPER sys conditional_expression { 695 $$ = build_binary($1, BITAND, $3, $4); 696 } 697 | conditional_expression T_BITXOR sys conditional_expression { 698 $$ = build_binary($1, BITXOR, $3, $4); 699 } 700 | conditional_expression T_BITOR sys conditional_expression { 701 $$ = build_binary($1, BITOR, $3, $4); 702 } 703 | conditional_expression T_LOGAND sys conditional_expression { 704 $$ = build_binary($1, LOGAND, $3, $4); 705 } 706 | conditional_expression T_LOGOR sys conditional_expression { 707 $$ = build_binary($1, LOGOR, $3, $4); 708 } 709 | conditional_expression T_QUEST sys 710 expression T_COLON sys conditional_expression { 711 $$ = build_binary($1, QUEST, $3, 712 build_binary($4, COLON, $6, $7)); 713 } 714 ; 715 716 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 717 assignment_expression: 718 conditional_expression 719 | unary_expression T_ASSIGN sys assignment_expression { 720 $$ = build_binary($1, ASSIGN, $3, $4); 721 } 722 | unary_expression T_OPASSIGN sys assignment_expression { 723 $$ = build_binary($1, $2, $3, $4); 724 } 725 ; 726 727 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 728 expression: 729 assignment_expression 730 | expression T_COMMA sys assignment_expression { 731 $$ = build_binary($1, COMMA, $3, $4); 732 } 733 ; 734 735 constant_expr_list_opt: /* helper for gcc_attribute */ 736 /* empty */ 737 | constant_expr_list 738 ; 739 740 constant_expr_list: /* helper for gcc_attribute */ 741 constant_expr 742 | constant_expr_list T_COMMA constant_expr 743 ; 744 745 constant_expr: /* C99 6.6 */ 746 conditional_expression 747 ; 748 749 declaration_or_error: 750 declaration 751 | error T_SEMI 752 ; 753 754 declaration: /* C99 6.7 */ 755 begin_type_declmods end_type T_SEMI { 756 if (dcs->d_scl == TYPEDEF) { 757 /* typedef declares no type name */ 758 warning(72); 759 } else { 760 /* empty declaration */ 761 warning(2); 762 } 763 } 764 | begin_type_declmods end_type notype_init_declarators T_SEMI { 765 if (dcs->d_scl == TYPEDEF) { 766 /* syntax error '%s' */ 767 error(249, "missing base type for typedef"); 768 } else { 769 /* old style declaration; add 'int' */ 770 error(1); 771 } 772 } 773 | begin_type_declaration_specifiers end_type T_SEMI { 774 if (dcs->d_scl == TYPEDEF) { 775 /* typedef declares no type name */ 776 warning(72); 777 } else if (!dcs->d_nonempty_decl) { 778 /* empty declaration */ 779 warning(2); 780 } 781 } 782 | begin_type_declaration_specifiers end_type 783 type_init_declarators T_SEMI 784 | static_assert_declaration 785 ; 786 787 begin_type_declaration_specifiers: /* see C99 6.7 */ 788 begin_type_typespec { 789 add_type($1); 790 } 791 | begin_type_declmods type_specifier { 792 add_type($2); 793 } 794 | type_attribute begin_type_declaration_specifiers 795 | begin_type_declaration_specifiers declmod 796 | begin_type_declaration_specifiers notype_type_specifier { 797 add_type($2); 798 } 799 ; 800 801 begin_type_declmods: /* see C99 6.7 */ 802 begin_type T_QUAL { 803 add_qualifier($2); 804 } 805 | begin_type T_SCLASS { 806 add_storage_class($2); 807 } 808 | begin_type_declmods declmod 809 ; 810 811 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 812 begin_type_specifier_qualifier_list_postfix 813 | type_attribute_list begin_type_specifier_qualifier_list_postfix 814 ; 815 816 begin_type_specifier_qualifier_list_postfix: 817 begin_type_typespec { 818 add_type($1); 819 } 820 | begin_type_qualifier_list type_specifier { 821 add_type($2); 822 } 823 | begin_type_specifier_qualifier_list_postfix T_QUAL { 824 add_qualifier($2); 825 } 826 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 827 add_type($2); 828 } 829 | begin_type_specifier_qualifier_list_postfix type_attribute 830 ; 831 832 begin_type_typespec: 833 begin_type notype_type_specifier { 834 $$ = $2; 835 } 836 | begin_type T_TYPENAME { 837 $$ = getsym($2)->s_type; 838 } 839 ; 840 841 begin_type_qualifier_list: 842 begin_type T_QUAL { 843 add_qualifier($2); 844 } 845 | begin_type_qualifier_list T_QUAL { 846 add_qualifier($2); 847 } 848 ; 849 850 declmod: 851 T_QUAL { 852 add_qualifier($1); 853 } 854 | T_SCLASS { 855 add_storage_class($1); 856 } 857 | type_attribute_list 858 ; 859 860 type_attribute_list_opt: 861 /* empty */ 862 | type_attribute_list 863 ; 864 865 type_attribute_list: 866 type_attribute 867 | type_attribute_list type_attribute 868 ; 869 870 type_attribute_opt: 871 /* empty */ 872 | type_attribute 873 ; 874 875 type_attribute: /* See C11 6.7 declaration-specifiers */ 876 gcc_attribute 877 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 878 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 879 | T_PACKED { 880 addpacked(); 881 } 882 | T_NORETURN 883 ; 884 885 begin_type: 886 /* empty */ { 887 begin_type(); 888 } 889 ; 890 891 end_type: 892 /* empty */ { 893 end_type(); 894 } 895 ; 896 897 type_specifier: /* C99 6.7.2 */ 898 notype_type_specifier 899 | T_TYPENAME { 900 $$ = getsym($1)->s_type; 901 } 902 ; 903 904 notype_type_specifier: /* see C99 6.7.2 */ 905 T_TYPE { 906 $$ = gettyp($1); 907 } 908 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 909 $$ = block_dup_type($3->tn_type); 910 $$->t_typeof = true; 911 } 912 | struct_or_union_specifier { 913 end_declaration_level(); 914 $$ = $1; 915 } 916 | enum_specifier { 917 end_declaration_level(); 918 $$ = $1; 919 } 920 ; 921 922 struct_or_union_specifier: /* C99 6.7.2.1 */ 923 struct_or_union identifier_sym { 924 /* 925 * STDC requires that "struct a;" always introduces 926 * a new tag if "a" is not declared at current level 927 * 928 * yychar is valid because otherwise the parser would not 929 * have been able to decide if it must shift or reduce 930 */ 931 $$ = mktag($2, $1, false, yychar == T_SEMI); 932 } 933 | struct_or_union identifier_sym { 934 dcs->d_tagtyp = mktag($2, $1, true, false); 935 } braced_struct_declaration_list { 936 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 937 } 938 | struct_or_union { 939 dcs->d_tagtyp = mktag(NULL, $1, true, false); 940 } braced_struct_declaration_list { 941 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 942 } 943 | struct_or_union error { 944 symtyp = FVFT; 945 $$ = gettyp(INT); 946 } 947 ; 948 949 struct_or_union: /* C99 6.7.2.1 */ 950 T_STRUCT_OR_UNION { 951 symtyp = FTAG; 952 begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); 953 dcs->d_offset_in_bits = 0; 954 dcs->d_sou_align_in_bits = CHAR_SIZE; 955 $$ = $1; 956 } 957 | struct_or_union type_attribute 958 ; 959 960 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 961 struct_declaration_lbrace struct_declaration_list_with_rbrace { 962 $$ = $2; 963 } 964 ; 965 966 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 967 T_LBRACE { 968 symtyp = FVFT; 969 } 970 ; 971 972 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 973 struct_declaration_list T_RBRACE 974 | T_RBRACE { 975 /* XXX: This is not allowed by any C standard. */ 976 $$ = NULL; 977 } 978 ; 979 980 struct_declaration_list: /* C99 6.7.2.1 */ 981 struct_declaration 982 | struct_declaration_list struct_declaration { 983 $$ = lnklst($1, $2); 984 } 985 ; 986 987 struct_declaration: /* C99 6.7.2.1 */ 988 begin_type_qualifier_list end_type { 989 /* ^^ There is no check for the missing type-specifier. */ 990 /* too late, i know, but getsym() compensates it */ 991 symtyp = FMEMBER; 992 } notype_struct_declarators type_attribute_opt T_SEMI { 993 symtyp = FVFT; 994 $$ = $4; 995 } 996 | begin_type_specifier_qualifier_list end_type { 997 symtyp = FMEMBER; 998 } type_struct_declarators type_attribute_opt T_SEMI { 999 symtyp = FVFT; 1000 $$ = $4; 1001 } 1002 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1003 /* syntax error '%s' */ 1004 error(249, "member without type"); 1005 $$ = NULL; 1006 } 1007 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1008 T_SEMI { 1009 symtyp = FVFT; 1010 if (!allow_c11 && !allow_gcc) 1011 /* anonymous struct/union members is a C11 feature */ 1012 warning(49); 1013 if (is_struct_or_union(dcs->d_type->t_tspec)) { 1014 $$ = dcs->d_type->t_str->sou_first_member; 1015 /* add all the members of the anonymous struct/union */ 1016 anonymize($$); 1017 } else { 1018 /* syntax error '%s' */ 1019 error(249, "unnamed member"); 1020 $$ = NULL; 1021 } 1022 } 1023 | static_assert_declaration { 1024 $$ = NULL; 1025 } 1026 | error T_SEMI { 1027 symtyp = FVFT; 1028 $$ = NULL; 1029 } 1030 ; 1031 1032 notype_struct_declarators: 1033 notype_struct_declarator { 1034 $$ = declarator_1_struct_union($1); 1035 } 1036 | notype_struct_declarators { 1037 symtyp = FMEMBER; 1038 } T_COMMA type_struct_declarator { 1039 $$ = lnklst($1, declarator_1_struct_union($4)); 1040 } 1041 ; 1042 1043 type_struct_declarators: 1044 type_struct_declarator { 1045 $$ = declarator_1_struct_union($1); 1046 } 1047 | type_struct_declarators { 1048 symtyp = FMEMBER; 1049 } T_COMMA type_struct_declarator { 1050 $$ = lnklst($1, declarator_1_struct_union($4)); 1051 } 1052 ; 1053 1054 notype_struct_declarator: 1055 notype_declarator 1056 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1057 $$ = bitfield($1, to_int_constant($3, true)); 1058 } 1059 | { 1060 symtyp = FVFT; 1061 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1062 $$ = bitfield(NULL, to_int_constant($3, true)); 1063 } 1064 ; 1065 1066 type_struct_declarator: 1067 type_declarator 1068 | type_declarator T_COLON constant_expr { 1069 $$ = bitfield($1, to_int_constant($3, true)); 1070 } 1071 | { 1072 symtyp = FVFT; 1073 } T_COLON constant_expr { 1074 $$ = bitfield(NULL, to_int_constant($3, true)); 1075 } 1076 ; 1077 1078 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1079 enum_specifier: /* C99 6.7.2.2 */ 1080 enum gcc_attribute_list_opt identifier_sym { 1081 $$ = mktag($3, ENUM, false, false); 1082 } 1083 | enum gcc_attribute_list_opt identifier_sym { 1084 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1085 } enum_declaration /*gcc_attribute_list_opt*/ { 1086 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1087 } 1088 | enum gcc_attribute_list_opt { 1089 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1090 } enum_declaration /*gcc_attribute_list_opt*/ { 1091 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1092 } 1093 | enum error { 1094 symtyp = FVFT; 1095 $$ = gettyp(INT); 1096 } 1097 ; 1098 1099 enum: /* helper for C99 6.7.2.2 */ 1100 T_ENUM { 1101 symtyp = FTAG; 1102 begin_declaration_level(DK_ENUM_CONST); 1103 } 1104 ; 1105 1106 enum_declaration: /* helper for C99 6.7.2.2 */ 1107 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1108 $$ = $2; 1109 } 1110 ; 1111 1112 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1113 T_LBRACE { 1114 symtyp = FVFT; 1115 enumval = 0; 1116 } 1117 ; 1118 1119 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1120 enumerator_list 1121 | enumerator_list T_COMMA { 1122 if (!allow_c99 && !allow_trad) { 1123 /* trailing ',' prohibited in enum declaration */ 1124 error(54); 1125 } else { 1126 /* trailing ',' prohibited in enum declaration */ 1127 c99ism(54); 1128 } 1129 $$ = $1; 1130 } 1131 ; 1132 1133 enumerator_list: /* C99 6.7.2.2 */ 1134 enumerator 1135 | enumerator_list T_COMMA enumerator { 1136 $$ = lnklst($1, $3); 1137 } 1138 | error { 1139 $$ = NULL; 1140 } 1141 ; 1142 1143 enumerator: /* C99 6.7.2.2 */ 1144 identifier_sym gcc_attribute_list_opt { 1145 $$ = enumeration_constant($1, enumval, true); 1146 } 1147 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1148 $$ = enumeration_constant($1, to_int_constant($4, true), 1149 false); 1150 } 1151 ; 1152 1153 type_qualifier: /* C99 6.7.3 */ 1154 T_QUAL { 1155 $$ = xcalloc(1, sizeof(*$$)); 1156 if ($1 == CONST) 1157 $$->p_const = true; 1158 if ($1 == VOLATILE) 1159 $$->p_volatile = true; 1160 } 1161 ; 1162 1163 pointer: /* C99 6.7.5 */ 1164 asterisk type_qualifier_list_opt { 1165 $$ = merge_qualified_pointer($1, $2); 1166 } 1167 | asterisk type_qualifier_list_opt pointer { 1168 $$ = merge_qualified_pointer($1, $2); 1169 $$ = merge_qualified_pointer($$, $3); 1170 } 1171 ; 1172 1173 asterisk: /* helper for 'pointer' */ 1174 T_ASTERISK { 1175 $$ = xcalloc(1, sizeof(*$$)); 1176 $$->p_pointer = true; 1177 } 1178 ; 1179 1180 type_qualifier_list_opt: /* see C99 6.7.5 */ 1181 /* empty */ { 1182 $$ = NULL; 1183 } 1184 | type_qualifier_list 1185 ; 1186 1187 type_qualifier_list: /* C99 6.7.5 */ 1188 type_qualifier 1189 | type_qualifier_list type_qualifier { 1190 $$ = merge_qualified_pointer($1, $2); 1191 } 1192 ; 1193 1194 /* 1195 * For an explanation of 'notype' in the following rules, see 1196 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1197 */ 1198 1199 notype_init_declarators: 1200 notype_init_declarator 1201 | notype_init_declarators T_COMMA type_init_declarator 1202 ; 1203 1204 type_init_declarators: 1205 type_init_declarator 1206 | type_init_declarators T_COMMA type_init_declarator 1207 ; 1208 1209 notype_init_declarator: 1210 notype_declarator asm_or_symbolrename_opt { 1211 cgram_declare($1, false, $2); 1212 check_size($1); 1213 } 1214 | notype_declarator asm_or_symbolrename_opt { 1215 begin_initialization($1); 1216 cgram_declare($1, true, $2); 1217 } T_ASSIGN initializer { 1218 check_size($1); 1219 end_initialization(); 1220 } 1221 ; 1222 1223 type_init_declarator: 1224 type_declarator asm_or_symbolrename_opt { 1225 cgram_declare($1, false, $2); 1226 check_size($1); 1227 } 1228 | type_declarator asm_or_symbolrename_opt { 1229 begin_initialization($1); 1230 cgram_declare($1, true, $2); 1231 } T_ASSIGN initializer { 1232 check_size($1); 1233 end_initialization(); 1234 } 1235 ; 1236 1237 notype_declarator: 1238 notype_direct_declarator 1239 | pointer notype_direct_declarator { 1240 $$ = add_pointer($2, $1); 1241 } 1242 ; 1243 1244 type_declarator: 1245 type_direct_declarator 1246 | pointer type_direct_declarator { 1247 $$ = add_pointer($2, $1); 1248 } 1249 ; 1250 1251 notype_direct_declarator: 1252 type_attribute_list_opt T_NAME { 1253 $$ = declarator_name(getsym($2)); 1254 } 1255 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1256 $$ = $3; 1257 } 1258 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1259 $$ = add_array($1, $3.has_dim, $3.dim); 1260 } 1261 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1262 $$ = add_function(symbolrename($1, $3), $2); 1263 end_declaration_level(); 1264 block_level--; 1265 } 1266 | notype_direct_declarator type_attribute 1267 ; 1268 1269 type_direct_declarator: 1270 type_attribute_list_opt identifier { 1271 $$ = declarator_name(getsym($2)); 1272 } 1273 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1274 $$ = $3; 1275 } 1276 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1277 $$ = add_array($1, $3.has_dim, $3.dim); 1278 } 1279 | type_direct_declarator param_list asm_or_symbolrename_opt { 1280 $$ = add_function(symbolrename($1, $3), $2); 1281 end_declaration_level(); 1282 block_level--; 1283 } 1284 | type_direct_declarator type_attribute 1285 ; 1286 1287 /* 1288 * The two distinct rules type_param_declarator and notype_param_declarator 1289 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1290 * always treated as a typename, not an argument name. For example, after 1291 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1292 * "f(int (double));", not "f(int a);". 1293 */ 1294 type_param_declarator: 1295 direct_param_declarator 1296 | pointer direct_param_declarator { 1297 $$ = add_pointer($2, $1); 1298 } 1299 ; 1300 1301 notype_param_declarator: 1302 direct_notype_param_declarator 1303 | pointer direct_notype_param_declarator { 1304 $$ = add_pointer($2, $1); 1305 } 1306 ; 1307 1308 direct_param_declarator: 1309 identifier type_attribute_list { 1310 $$ = declarator_name(getsym($1)); 1311 } 1312 | identifier { 1313 $$ = declarator_name(getsym($1)); 1314 } 1315 | T_LPAREN notype_param_declarator T_RPAREN { 1316 $$ = $2; 1317 } 1318 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1319 gcc_attribute_list_opt { 1320 $$ = add_array($1, $3.has_dim, $3.dim); 1321 } 1322 | direct_param_declarator param_list asm_or_symbolrename_opt { 1323 $$ = add_function(symbolrename($1, $3), $2); 1324 end_declaration_level(); 1325 block_level--; 1326 } 1327 ; 1328 1329 direct_notype_param_declarator: 1330 identifier { 1331 $$ = declarator_name(getsym($1)); 1332 } 1333 | T_LPAREN notype_param_declarator T_RPAREN { 1334 $$ = $2; 1335 } 1336 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1337 $$ = add_array($1, $3.has_dim, $3.dim); 1338 } 1339 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1340 $$ = add_function(symbolrename($1, $3), $2); 1341 end_declaration_level(); 1342 block_level--; 1343 } 1344 ; 1345 1346 param_list: 1347 id_list_lparen identifier_list T_RPAREN { 1348 $$ = $2; 1349 } 1350 | abstract_decl_param_list 1351 ; 1352 1353 id_list_lparen: 1354 T_LPAREN { 1355 block_level++; 1356 begin_declaration_level(DK_PROTO_ARG); 1357 } 1358 ; 1359 1360 array_size_opt: 1361 /* empty */ { 1362 $$.has_dim = false; 1363 $$.dim = 0; 1364 } 1365 | T_ASTERISK { 1366 /* since C99; variable length array of unspecified size */ 1367 $$.has_dim = false; /* TODO: maybe change to true */ 1368 $$.dim = 0; /* just as a placeholder */ 1369 } 1370 | array_size { 1371 $$.has_dim = true; 1372 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1373 } 1374 ; 1375 1376 array_size: 1377 type_qualifier_list_opt T_SCLASS constant_expr { 1378 /* C11 6.7.6.3p7 */ 1379 if ($2 != STATIC) 1380 yyerror("Bad attribute"); 1381 /* static array size is a C11 extension */ 1382 c11ism(343); 1383 $$ = $3; 1384 } 1385 | T_QUAL { 1386 /* C11 6.7.6.2 */ 1387 if ($1 != RESTRICT) 1388 yyerror("Bad attribute"); 1389 $$ = NULL; 1390 } 1391 | constant_expr 1392 ; 1393 1394 identifier_list: /* C99 6.7.5 */ 1395 T_NAME { 1396 $$ = old_style_function_name(getsym($1)); 1397 } 1398 | identifier_list T_COMMA T_NAME { 1399 $$ = lnklst($1, old_style_function_name(getsym($3))); 1400 } 1401 | identifier_list error 1402 ; 1403 1404 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1405 type_name: /* C99 6.7.6 */ 1406 { 1407 begin_declaration_level(DK_ABSTRACT); 1408 } abstract_declaration { 1409 end_declaration_level(); 1410 $$ = $2->s_type; 1411 } 1412 ; 1413 1414 abstract_declaration: /* specific to lint */ 1415 begin_type_qualifier_list end_type { 1416 $$ = declare_1_abstract(abstract_name()); 1417 } 1418 | begin_type_specifier_qualifier_list end_type { 1419 $$ = declare_1_abstract(abstract_name()); 1420 } 1421 | begin_type_qualifier_list end_type abstract_declarator { 1422 $$ = declare_1_abstract($3); 1423 } 1424 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1425 $$ = declare_1_abstract($3); 1426 } 1427 ; 1428 1429 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1430 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1431 abstract_declarator: 1432 pointer { 1433 $$ = add_pointer(abstract_name(), $1); 1434 } 1435 | direct_abstract_declarator 1436 | pointer direct_abstract_declarator { 1437 $$ = add_pointer($2, $1); 1438 } 1439 | type_attribute_list direct_abstract_declarator { 1440 $$ = $2; 1441 } 1442 | pointer type_attribute_list direct_abstract_declarator { 1443 $$ = add_pointer($3, $1); 1444 } 1445 ; 1446 1447 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1448 direct_abstract_declarator: 1449 /* TODO: sort rules according to C99 */ 1450 T_LPAREN abstract_declarator T_RPAREN { 1451 $$ = $2; 1452 } 1453 | T_LBRACK array_size_opt T_RBRACK { 1454 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1455 } 1456 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1457 $$ = add_array($1, $3.has_dim, $3.dim); 1458 } 1459 | abstract_decl_param_list asm_or_symbolrename_opt { 1460 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1461 end_declaration_level(); 1462 block_level--; 1463 } 1464 | direct_abstract_declarator abstract_decl_param_list 1465 asm_or_symbolrename_opt { 1466 $$ = add_function(symbolrename($1, $3), $2); 1467 end_declaration_level(); 1468 block_level--; 1469 } 1470 | direct_abstract_declarator type_attribute_list 1471 ; 1472 1473 abstract_decl_param_list: /* specific to lint */ 1474 abstract_decl_lparen T_RPAREN type_attribute_opt { 1475 $$ = NULL; 1476 } 1477 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1478 type_attribute_opt { 1479 dcs->d_proto = true; 1480 $$ = $2; 1481 } 1482 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1483 $$ = NULL; 1484 } 1485 ; 1486 1487 abstract_decl_lparen: /* specific to lint */ 1488 T_LPAREN { 1489 block_level++; 1490 begin_declaration_level(DK_PROTO_ARG); 1491 } 1492 ; 1493 1494 vararg_parameter_type_list: /* specific to lint */ 1495 parameter_type_list 1496 | parameter_type_list T_COMMA T_ELLIPSIS { 1497 dcs->d_vararg = true; 1498 $$ = $1; 1499 } 1500 | T_ELLIPSIS { 1501 /* TODO: C99 6.7.5 makes this an error as well. */ 1502 if (!allow_trad && !allow_c99) { 1503 /* ANSI C requires formal parameter before '...' */ 1504 error(84); 1505 } else if (allow_c90) { 1506 /* ANSI C requires formal parameter before '...' */ 1507 warning(84); 1508 } 1509 dcs->d_vararg = true; 1510 $$ = NULL; 1511 } 1512 ; 1513 1514 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1515 parameter_type_list: 1516 parameter_declaration 1517 | parameter_type_list T_COMMA parameter_declaration { 1518 $$ = lnklst($1, $3); 1519 } 1520 ; 1521 1522 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1523 parameter_declaration: 1524 begin_type_declmods end_type { 1525 /* ^^ There is no check for the missing type-specifier. */ 1526 $$ = declare_argument(abstract_name(), false); 1527 } 1528 | begin_type_declaration_specifiers end_type { 1529 $$ = declare_argument(abstract_name(), false); 1530 } 1531 | begin_type_declmods end_type notype_param_declarator { 1532 /* ^^ There is no check for the missing type-specifier. */ 1533 $$ = declare_argument($3, false); 1534 } 1535 /* 1536 * type_param_declarator is needed because of following conflict: 1537 * "typedef int a; f(int (a));" could be parsed as 1538 * "function with argument a of type int", or 1539 * "function with an abstract argument of type function". 1540 * This grammar realizes the second case. 1541 */ 1542 | begin_type_declaration_specifiers end_type type_param_declarator { 1543 $$ = declare_argument($3, false); 1544 } 1545 | begin_type_declmods end_type abstract_declarator { 1546 /* ^^ There is no check for the missing type-specifier. */ 1547 $$ = declare_argument($3, false); 1548 } 1549 | begin_type_declaration_specifiers end_type abstract_declarator { 1550 $$ = declare_argument($3, false); 1551 } 1552 ; 1553 1554 initializer: /* C99 6.7.8 "Initialization" */ 1555 assignment_expression { 1556 init_expr($1); 1557 } 1558 | init_lbrace init_rbrace { 1559 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1560 } 1561 | init_lbrace initializer_list comma_opt init_rbrace 1562 /* XXX: What is this error handling for? */ 1563 | error 1564 ; 1565 1566 initializer_list: /* C99 6.7.8 "Initialization" */ 1567 initializer_list_item 1568 | initializer_list T_COMMA initializer_list_item 1569 ; 1570 1571 initializer_list_item: /* helper */ 1572 designation initializer 1573 | initializer 1574 ; 1575 1576 designation: /* C99 6.7.8 "Initialization" */ 1577 begin_designation designator_list T_ASSIGN 1578 | identifier T_COLON { 1579 /* GCC style struct or union member name in initializer */ 1580 gnuism(315); 1581 begin_designation(); 1582 add_designator_member($1); 1583 } 1584 ; 1585 1586 begin_designation: /* lint-specific helper */ 1587 /* empty */ { 1588 begin_designation(); 1589 } 1590 ; 1591 1592 designator_list: /* C99 6.7.8 "Initialization" */ 1593 designator 1594 | designator_list designator 1595 ; 1596 1597 designator: /* C99 6.7.8 "Initialization" */ 1598 T_LBRACK range T_RBRACK { 1599 if (!allow_c99) 1600 /* array initializer with designators is a C99 ... */ 1601 warning(321); 1602 add_designator_subscript($2); 1603 } 1604 | T_POINT identifier { 1605 if (!allow_c99) 1606 /* struct or union member name in initializer is ... */ 1607 warning(313); 1608 add_designator_member($2); 1609 } 1610 ; 1611 1612 static_assert_declaration: 1613 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1614 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1615 ; 1616 1617 range: 1618 constant_expr { 1619 $$.lo = to_int_constant($1, true); 1620 $$.hi = $$.lo; 1621 } 1622 | constant_expr T_ELLIPSIS constant_expr { 1623 $$.lo = to_int_constant($1, true); 1624 $$.hi = to_int_constant($3, true); 1625 /* initialization with '[a...b]' is a GCC extension */ 1626 gnuism(340); 1627 } 1628 ; 1629 1630 init_lbrace: /* helper */ 1631 T_LBRACE { 1632 init_lbrace(); 1633 } 1634 ; 1635 1636 init_rbrace: /* helper */ 1637 T_RBRACE { 1638 init_rbrace(); 1639 } 1640 ; 1641 1642 asm_or_symbolrename_opt: /* GCC extensions */ 1643 /* empty */ { 1644 $$ = NULL; 1645 } 1646 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1647 freeyyv(&$3, T_STRING); 1648 $$ = NULL; 1649 } 1650 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1651 $$ = $3; 1652 } 1653 ; 1654 1655 statement: /* C99 6.8 */ 1656 expression_statement 1657 | non_expr_statement 1658 ; 1659 1660 non_expr_statement: /* helper for C99 6.8 */ 1661 gcc_attribute /* ((__fallthrough__)) */ T_SEMI 1662 | labeled_statement 1663 | compound_statement 1664 | selection_statement 1665 | iteration_statement 1666 | jump_statement { 1667 seen_fallthrough = false; 1668 } 1669 | asm_statement 1670 ; 1671 1672 labeled_statement: /* C99 6.8.1 */ 1673 label gcc_attribute_list_opt statement 1674 ; 1675 1676 label: 1677 T_NAME T_COLON { 1678 symtyp = FLABEL; 1679 named_label(getsym($1)); 1680 } 1681 | T_CASE constant_expr T_COLON { 1682 case_label($2); 1683 seen_fallthrough = true; 1684 } 1685 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1686 /* XXX: We don't fill all cases */ 1687 case_label($2); 1688 seen_fallthrough = true; 1689 } 1690 | T_DEFAULT T_COLON { 1691 default_label(); 1692 seen_fallthrough = true; 1693 } 1694 ; 1695 1696 compound_statement: /* C99 6.8.2 */ 1697 compound_statement_lbrace compound_statement_rbrace 1698 | compound_statement_lbrace block_item_list compound_statement_rbrace 1699 ; 1700 1701 compound_statement_lbrace: 1702 T_LBRACE { 1703 block_level++; 1704 mem_block_level++; 1705 begin_declaration_level(DK_AUTO); 1706 } 1707 ; 1708 1709 compound_statement_rbrace: 1710 T_RBRACE { 1711 end_declaration_level(); 1712 level_free_all(mem_block_level); 1713 mem_block_level--; 1714 block_level--; 1715 seen_fallthrough = false; 1716 } 1717 ; 1718 1719 block_item_list: /* C99 6.8.2 */ 1720 block_item 1721 | block_item_list block_item { 1722 if ($1 && !$2) 1723 /* declarations after statements is a C99 feature */ 1724 c99ism(327); 1725 $$ = $1 || $2; 1726 } 1727 ; 1728 1729 block_item: /* C99 6.8.2 */ 1730 declaration_or_error { 1731 $$ = false; 1732 restore_warning_flags(); 1733 } 1734 | statement { 1735 $$ = true; 1736 restore_warning_flags(); 1737 } 1738 ; 1739 1740 expression_statement: /* C99 6.8.3 */ 1741 expression T_SEMI { 1742 expr($1, false, false, false, false); 1743 seen_fallthrough = false; 1744 } 1745 | T_SEMI { 1746 check_statement_reachable(); 1747 seen_fallthrough = false; 1748 } 1749 ; 1750 1751 selection_statement: /* C99 6.8.4 */ 1752 if_without_else %prec T_THEN { 1753 save_warning_flags(); 1754 if2(); 1755 if3(false); 1756 } 1757 | if_without_else T_ELSE { 1758 save_warning_flags(); 1759 if2(); 1760 } statement { 1761 clear_warning_flags(); 1762 if3(true); 1763 } 1764 | if_without_else T_ELSE error { 1765 clear_warning_flags(); 1766 if3(false); 1767 } 1768 | switch_expr statement { 1769 clear_warning_flags(); 1770 switch2(); 1771 } 1772 | switch_expr error { 1773 clear_warning_flags(); 1774 switch2(); 1775 } 1776 ; 1777 1778 if_without_else: /* see C99 6.8.4 */ 1779 if_expr statement 1780 | if_expr error 1781 ; 1782 1783 if_expr: /* see C99 6.8.4 */ 1784 T_IF T_LPAREN expression T_RPAREN { 1785 if1($3); 1786 clear_warning_flags(); 1787 } 1788 ; 1789 1790 switch_expr: /* see C99 6.8.4 */ 1791 T_SWITCH T_LPAREN expression T_RPAREN { 1792 switch1($3); 1793 clear_warning_flags(); 1794 } 1795 ; 1796 1797 iteration_statement: /* C99 6.8.5 */ 1798 while_expr statement { 1799 clear_warning_flags(); 1800 while2(); 1801 } 1802 | while_expr error { 1803 clear_warning_flags(); 1804 while2(); 1805 } 1806 | do_statement do_while_expr { 1807 do2($2); 1808 seen_fallthrough = false; 1809 } 1810 | do error { 1811 clear_warning_flags(); 1812 do2(NULL); 1813 } 1814 | for_exprs statement { 1815 clear_warning_flags(); 1816 for2(); 1817 end_declaration_level(); 1818 block_level--; 1819 } 1820 | for_exprs error { 1821 clear_warning_flags(); 1822 for2(); 1823 end_declaration_level(); 1824 block_level--; 1825 } 1826 ; 1827 1828 while_expr: /* see C99 6.8.5 */ 1829 T_WHILE T_LPAREN expression T_RPAREN { 1830 while1($3); 1831 clear_warning_flags(); 1832 } 1833 ; 1834 1835 do_statement: /* see C99 6.8.5 */ 1836 do statement { 1837 clear_warning_flags(); 1838 } 1839 ; 1840 1841 do: /* see C99 6.8.5 */ 1842 T_DO { 1843 do1(); 1844 } 1845 ; 1846 1847 do_while_expr: /* see C99 6.8.5 */ 1848 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1849 $$ = $3; 1850 } 1851 ; 1852 1853 for_start: /* see C99 6.8.5 */ 1854 T_FOR T_LPAREN { 1855 begin_declaration_level(DK_AUTO); 1856 block_level++; 1857 } 1858 ; 1859 1860 for_exprs: /* see C99 6.8.5 */ 1861 for_start 1862 begin_type_declaration_specifiers end_type 1863 notype_init_declarators T_SEMI 1864 expression_opt T_SEMI 1865 expression_opt T_RPAREN { 1866 /* variable declaration in for loop */ 1867 c99ism(325); 1868 for1(NULL, $6, $8); 1869 clear_warning_flags(); 1870 } 1871 | for_start 1872 expression_opt T_SEMI 1873 expression_opt T_SEMI 1874 expression_opt T_RPAREN { 1875 for1($2, $4, $6); 1876 clear_warning_flags(); 1877 } 1878 ; 1879 1880 jump_statement: /* C99 6.8.6 */ 1881 goto identifier T_SEMI { 1882 do_goto(getsym($2)); 1883 } 1884 | goto error T_SEMI { 1885 symtyp = FVFT; 1886 } 1887 | T_CONTINUE T_SEMI { 1888 do_continue(); 1889 } 1890 | T_BREAK T_SEMI { 1891 do_break(); 1892 } 1893 | T_RETURN sys T_SEMI { 1894 do_return($2, NULL); 1895 } 1896 | T_RETURN sys expression T_SEMI { 1897 do_return($2, $3); 1898 } 1899 ; 1900 1901 goto: /* see C99 6.8.6 */ 1902 T_GOTO { 1903 symtyp = FLABEL; 1904 } 1905 ; 1906 1907 asm_statement: /* GCC extension */ 1908 T_ASM T_LPAREN read_until_rparen T_SEMI { 1909 setasm(); 1910 } 1911 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1912 setasm(); 1913 } 1914 | T_ASM error 1915 ; 1916 1917 read_until_rparen: /* helper for 'asm_statement' */ 1918 /* empty */ { 1919 read_until_rparen(); 1920 } 1921 ; 1922 1923 translation_unit: /* C99 6.9 */ 1924 external_declaration 1925 | translation_unit external_declaration 1926 ; 1927 1928 external_declaration: /* C99 6.9 */ 1929 function_definition { 1930 global_clean_up_decl(false); 1931 clear_warning_flags(); 1932 } 1933 | top_level_declaration { 1934 global_clean_up_decl(false); 1935 clear_warning_flags(); 1936 } 1937 | asm_statement /* GCC extension */ 1938 | T_SEMI { /* GCC extension */ 1939 /* 1940 * TODO: Only allow this in GCC mode, not in plain C99. 1941 * This is one of the top 10 warnings in the NetBSD build. 1942 */ 1943 if (!allow_trad && !allow_c99) { 1944 /* empty declaration */ 1945 error(0); 1946 } else if (allow_c90) { 1947 /* empty declaration */ 1948 warning(0); 1949 } 1950 } 1951 ; 1952 1953 /* 1954 * On the top level, lint allows several forms of declarations that it doesn't 1955 * allow in functions. For example, a single ';' is an empty declaration and 1956 * is supported by some compilers, but in a function it would be an empty 1957 * statement, not a declaration. This makes a difference in C90 mode, where 1958 * a statement must not be followed by a declaration. 1959 * 1960 * See 'declaration' for all other declarations. 1961 */ 1962 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1963 begin_type end_type notype_init_declarators T_SEMI { 1964 /* TODO: Make this an error in C99 mode as well. */ 1965 if (!allow_trad && !allow_c99) { 1966 /* old style declaration; add 'int' */ 1967 error(1); 1968 } else if (allow_c90) { 1969 /* old style declaration; add 'int' */ 1970 warning(1); 1971 } 1972 } 1973 | declaration 1974 | error T_SEMI { 1975 global_clean_up(); 1976 } 1977 | error T_RBRACE { 1978 global_clean_up(); 1979 } 1980 ; 1981 1982 function_definition: /* C99 6.9.1 */ 1983 func_declarator { 1984 if ($1->s_type->t_tspec != FUNC) { 1985 /* syntax error '%s' */ 1986 error(249, yytext); 1987 YYERROR; 1988 } 1989 if ($1->s_type->t_typedef) { 1990 /* ()-less function definition */ 1991 error(64); 1992 YYERROR; 1993 } 1994 funcdef($1); 1995 block_level++; 1996 begin_declaration_level(DK_OLD_STYLE_ARG); 1997 if (lwarn == LWARN_NONE) 1998 $1->s_used = true; 1999 } arg_declaration_list_opt { 2000 end_declaration_level(); 2001 block_level--; 2002 check_func_lint_directives(); 2003 check_func_old_style_arguments(); 2004 begin_control_statement(CS_FUNCTION_BODY); 2005 } compound_statement { 2006 funcend(); 2007 end_control_statement(CS_FUNCTION_BODY); 2008 } 2009 ; 2010 2011 func_declarator: 2012 begin_type end_type notype_declarator { 2013 if (!allow_trad) { 2014 /* old style declaration; add 'int' */ 2015 error(1); 2016 } 2017 $$ = $3; 2018 } 2019 | begin_type_declmods end_type notype_declarator { 2020 if (!allow_trad) { 2021 /* old style declaration; add 'int' */ 2022 error(1); 2023 } 2024 $$ = $3; 2025 } 2026 | begin_type_declaration_specifiers end_type type_declarator { 2027 $$ = $3; 2028 } 2029 ; 2030 2031 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2032 /* empty */ 2033 | arg_declaration_list 2034 ; 2035 2036 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2037 arg_declaration 2038 | arg_declaration_list arg_declaration 2039 /* XXX or better "arg_declaration error" ? */ 2040 | error 2041 ; 2042 2043 /* 2044 * "arg_declaration" is separated from "declaration" because it 2045 * needs other error handling. 2046 */ 2047 arg_declaration: 2048 begin_type_declmods end_type T_SEMI { 2049 /* empty declaration */ 2050 warning(2); 2051 } 2052 | begin_type_declmods end_type notype_init_declarators T_SEMI 2053 | begin_type_declaration_specifiers end_type T_SEMI { 2054 if (!dcs->d_nonempty_decl) { 2055 /* empty declaration */ 2056 warning(2); 2057 } else { 2058 /* '%s' declared in argument declaration list */ 2059 warning(3, type_name(dcs->d_type)); 2060 } 2061 } 2062 | begin_type_declaration_specifiers end_type 2063 type_init_declarators T_SEMI { 2064 if (dcs->d_nonempty_decl) { 2065 /* '%s' declared in argument declaration list */ 2066 warning(3, type_name(dcs->d_type)); 2067 } 2068 } 2069 | begin_type_declmods error 2070 | begin_type_declaration_specifiers error 2071 ; 2072 2073 gcc_attribute_list_opt: 2074 /* empty */ 2075 | gcc_attribute_list 2076 ; 2077 2078 gcc_attribute_list: 2079 gcc_attribute 2080 | gcc_attribute_list gcc_attribute 2081 ; 2082 2083 gcc_attribute: 2084 T_ATTRIBUTE T_LPAREN T_LPAREN { 2085 in_gcc_attribute = true; 2086 } gcc_attribute_spec_list { 2087 in_gcc_attribute = false; 2088 } T_RPAREN T_RPAREN 2089 ; 2090 2091 gcc_attribute_spec_list: 2092 gcc_attribute_spec 2093 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2094 ; 2095 2096 gcc_attribute_spec: 2097 /* empty */ 2098 | T_AT_ALWAYS_INLINE 2099 | T_AT_ALIAS T_LPAREN string T_RPAREN 2100 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2101 | T_AT_ALIGNED 2102 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2103 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2104 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2105 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2106 | T_AT_COLD 2107 | T_AT_COMMON 2108 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2109 | T_AT_CONSTRUCTOR 2110 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2111 | T_AT_DEPRECATED 2112 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2113 | T_AT_DESTRUCTOR 2114 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2115 | T_AT_FALLTHROUGH { 2116 fallthru(1); 2117 } 2118 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2119 constant_expr T_COMMA constant_expr T_RPAREN 2120 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2121 | T_AT_GNU_INLINE 2122 | T_AT_HOT 2123 | T_AT_MALLOC 2124 | T_AT_MAY_ALIAS 2125 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2126 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2127 | T_AT_NO_SANITIZE_THREAD 2128 | T_AT_NOINLINE 2129 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2130 | T_AT_NONNULL 2131 | T_AT_NONSTRING 2132 | T_AT_NORETURN 2133 | T_AT_NOTHROW 2134 | T_AT_NO_INSTRUMENT_FUNCTION 2135 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2136 | T_AT_OPTNONE 2137 | T_AT_PACKED { 2138 addpacked(); 2139 } 2140 | T_AT_PCS T_LPAREN string T_RPAREN 2141 | T_AT_PURE 2142 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2143 | T_AT_RETURNS_NONNULL 2144 | T_AT_RETURNS_TWICE 2145 | T_AT_SECTION T_LPAREN string T_RPAREN 2146 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2147 | T_AT_SENTINEL 2148 | T_AT_TARGET T_LPAREN string T_RPAREN 2149 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2150 | T_AT_TUNION 2151 | T_AT_UNUSED { 2152 add_attr_used(); 2153 } 2154 | T_AT_USED { 2155 add_attr_used(); 2156 } 2157 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2158 | T_AT_WARN_UNUSED_RESULT 2159 | T_AT_WEAK 2160 | T_QUAL { 2161 if ($1 != CONST) 2162 yyerror("Bad attribute"); 2163 } 2164 ; 2165 2166 gcc_attribute_bounded: 2167 T_AT_MINBYTES 2168 | T_AT_STRING 2169 | T_AT_BUFFER 2170 ; 2171 2172 gcc_attribute_format: 2173 T_AT_FORMAT_GNU_PRINTF 2174 | T_AT_FORMAT_PRINTF 2175 | T_AT_FORMAT_SCANF 2176 | T_AT_FORMAT_STRFMON 2177 | T_AT_FORMAT_STRFTIME 2178 | T_AT_FORMAT_SYSLOG 2179 ; 2180 2181 sys: 2182 /* empty */ { 2183 $$ = in_system_header; 2184 } 2185 ; 2186 2187 %% 2188 2189 /* ARGSUSED */ 2190 int 2191 yyerror(const char *msg) 2192 { 2193 /* syntax error '%s' */ 2194 error(249, yytext); 2195 if (++sytxerr >= 5) 2196 norecover(); 2197 return 0; 2198 } 2199 2200 #if YYDEBUG && (YYBYACC || YYBISON) 2201 static const char * 2202 cgram_to_string(int token, YYSTYPE val) 2203 { 2204 2205 switch (token) { 2206 case T_INCDEC: 2207 case T_MULTIPLICATIVE: 2208 case T_ADDITIVE: 2209 case T_SHIFT: 2210 case T_RELATIONAL: 2211 case T_EQUALITY: 2212 case T_OPASSIGN: 2213 return modtab[val.y_op].m_name; 2214 case T_SCLASS: 2215 return scl_name(val.y_scl); 2216 case T_TYPE: 2217 case T_STRUCT_OR_UNION: 2218 return tspec_name(val.y_tspec); 2219 case T_QUAL: 2220 return tqual_name(val.y_tqual); 2221 case T_NAME: 2222 return val.y_name->sb_name; 2223 default: 2224 return "<none>"; 2225 } 2226 } 2227 #endif 2228 2229 #if YYDEBUG && YYBISON 2230 static inline void 2231 cgram_print(FILE *output, int token, YYSTYPE val) 2232 { 2233 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2234 } 2235 #endif 2236 2237 static void 2238 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2239 { 2240 declare(decl, initflg, renaming); 2241 if (renaming != NULL) 2242 freeyyv(&renaming, T_NAME); 2243 } 2244 2245 /* 2246 * Discard all input tokens up to and including the next 2247 * unmatched right paren 2248 */ 2249 static void 2250 read_until_rparen(void) 2251 { 2252 int level; 2253 2254 if (yychar < 0) 2255 yychar = yylex(); 2256 freeyyv(&yylval, yychar); 2257 2258 level = 1; 2259 while (yychar != T_RPAREN || --level > 0) { 2260 if (yychar == T_LPAREN) { 2261 level++; 2262 } else if (yychar <= 0) { 2263 break; 2264 } 2265 freeyyv(&yylval, yychar = yylex()); 2266 } 2267 2268 yyclearin; 2269 } 2270 2271 static sym_t * 2272 symbolrename(sym_t *s, sbuf_t *sb) 2273 { 2274 if (sb != NULL) 2275 s->s_rename = sb->sb_name; 2276 return s; 2277 } 2278
Indexes created Fri Oct 03 02:09:57 GMT 2025