cgram.y revision 1.420
1 %{ 2 /* $NetBSD: cgram.y,v 1.420 2022/06/20 21:13:35 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 1.420 2022/06/20 21:13:35 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 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 /* 89 * There used to be an assertion that saved_lwarn is 90 * LWARN_NOTHING_SAVED here, but that triggered for the following 91 * code: 92 * 93 * void function(int x) { if (x > 0) if (x > 1) return; } 94 * 95 * It didn't trigger if the inner 'if' was enclosed in braces though. 96 * 97 * TODO: If actually needed, add support for nested suppression of 98 * warnings. 99 */ 100 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 101 saved_lwarn = lwarn; 102 } 103 104 /* ARGSUSED */ 105 static void 106 restore_warning_flags_loc(const char *file, size_t line) 107 { 108 if (saved_lwarn != LWARN_NOTHING_SAVED) { 109 lwarn = saved_lwarn; 110 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 111 /* 112 * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to 113 * avoid triggering the assertion in save_warning_flags_loc. 114 */ 115 } else 116 clear_warning_flags_loc(file, line); 117 } 118 119 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 120 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 121 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 122 123 /* unbind the anonymous struct members from the struct */ 124 static void 125 anonymize(sym_t *s) 126 { 127 for ( ; s != NULL; s = s->s_next) 128 s->u.s_member.sm_sou_type = NULL; 129 } 130 131 #if YYDEBUG && (YYBYACC || YYBISON) 132 #define YYSTYPE_TOSTRING cgram_to_string 133 #endif 134 #if YYDEBUG && YYBISON 135 #define YYPRINT cgram_print 136 #endif 137 138 %} 139 140 %expect 129 141 142 %union { 143 val_t *y_val; 144 sbuf_t *y_name; 145 sym_t *y_sym; 146 op_t y_op; 147 scl_t y_scl; 148 tspec_t y_tspec; 149 tqual_t y_tqual; 150 type_t *y_type; 151 tnode_t *y_tnode; 152 range_t y_range; 153 strg_t *y_string; 154 qual_ptr *y_qual_ptr; 155 bool y_seen_statement; 156 struct generic_association *y_generic; 157 struct array_size y_array_size; 158 bool y_in_system_header; 159 }; 160 161 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 162 %token T_POINT T_ARROW 163 %token T_COMPLEMENT T_LOGNOT 164 %token <y_op> T_INCDEC 165 %token T_SIZEOF 166 %token T_BUILTIN_OFFSETOF 167 %token T_TYPEOF 168 %token T_EXTENSION 169 %token T_ALIGNAS 170 %token T_ALIGNOF 171 %token T_ASTERISK 172 %token <y_op> T_MULTIPLICATIVE 173 %token <y_op> T_ADDITIVE 174 %token <y_op> T_SHIFT 175 %token <y_op> T_RELATIONAL 176 %token <y_op> T_EQUALITY 177 %token T_AMPER 178 %token T_BITXOR 179 %token T_BITOR 180 %token T_LOGAND 181 %token T_LOGOR 182 %token T_QUEST 183 %token T_COLON 184 %token T_ASSIGN 185 %token <y_op> T_OPASSIGN 186 %token T_COMMA 187 %token T_SEMI 188 %token T_ELLIPSIS 189 %token T_REAL 190 %token T_IMAG 191 %token T_GENERIC 192 %token T_NORETURN 193 194 /* storage classes (extern, static, auto, register and typedef) */ 195 %token <y_scl> T_SCLASS 196 197 /* 198 * predefined type keywords (char, int, short, long, unsigned, signed, 199 * float, double, void); see T_TYPENAME for types from typedef 200 */ 201 %token <y_tspec> T_TYPE 202 203 /* qualifiers (const, volatile, restrict, _Thread_local) */ 204 %token <y_tqual> T_QUAL 205 206 /* struct or union */ 207 %token <y_tspec> T_STRUCT_OR_UNION 208 209 /* remaining keywords */ 210 %token T_ASM 211 %token T_BREAK 212 %token T_CASE 213 %token T_CONTINUE 214 %token T_DEFAULT 215 %token T_DO 216 %token T_ELSE 217 %token T_ENUM 218 %token T_FOR 219 %token T_GOTO 220 %token T_IF 221 %token T_PACKED 222 %token T_RETURN 223 %token T_SWITCH 224 %token T_SYMBOLRENAME 225 %token T_WHILE 226 %token T_STATIC_ASSERT 227 228 %token T_ATTRIBUTE 229 %token T_AT_ALIAS 230 %token T_AT_ALIGNED 231 %token T_AT_ALLOC_SIZE 232 %token T_AT_ALWAYS_INLINE 233 %token T_AT_BOUNDED 234 %token T_AT_BUFFER 235 %token T_AT_COLD 236 %token T_AT_COMMON 237 %token T_AT_CONSTRUCTOR 238 %token T_AT_DEPRECATED 239 %token T_AT_DESTRUCTOR 240 %token T_AT_DISABLE_SANITIZER_INSTRUMENTATION 241 %token T_AT_FALLTHROUGH 242 %token T_AT_FORMAT 243 %token T_AT_FORMAT_ARG 244 %token T_AT_FORMAT_GNU_PRINTF 245 %token T_AT_FORMAT_PRINTF 246 %token T_AT_FORMAT_SCANF 247 %token T_AT_FORMAT_STRFMON 248 %token T_AT_FORMAT_STRFTIME 249 %token T_AT_FORMAT_SYSLOG 250 %token T_AT_GNU_INLINE 251 %token T_AT_HOT 252 %token T_AT_MALLOC 253 %token T_AT_MAY_ALIAS 254 %token T_AT_MINBYTES 255 %token T_AT_MODE 256 %token T_AT_NO_SANITIZE 257 %token T_AT_NO_SANITIZE_THREAD 258 %token T_AT_NOINLINE 259 %token T_AT_NONNULL 260 %token T_AT_NONSTRING 261 %token T_AT_NORETURN 262 %token T_AT_NOTHROW 263 %token T_AT_NO_INSTRUMENT_FUNCTION 264 %token T_AT_OPTIMIZE 265 %token T_AT_OPTNONE 266 %token T_AT_PACKED 267 %token T_AT_PCS 268 %token T_AT_PURE 269 %token T_AT_REGPARM 270 %token T_AT_RETURNS_NONNULL 271 %token T_AT_RETURNS_TWICE 272 %token T_AT_SECTION 273 %token T_AT_SENTINEL 274 %token T_AT_STRING 275 %token T_AT_TARGET 276 %token T_AT_TLS_MODEL 277 %token T_AT_TUNION 278 %token T_AT_UNUSED 279 %token T_AT_USED 280 %token T_AT_VISIBILITY 281 %token T_AT_WARN_UNUSED_RESULT 282 %token T_AT_WEAK 283 284 %left T_THEN 285 %left T_ELSE 286 %right T_QUEST T_COLON 287 %left T_LOGOR 288 %left T_LOGAND 289 %left T_BITOR 290 %left T_BITXOR 291 %left T_AMPER 292 %left T_EQUALITY 293 %left T_RELATIONAL 294 %left T_SHIFT 295 %left T_ADDITIVE 296 %left T_ASTERISK T_MULTIPLICATIVE 297 298 %token <y_name> T_NAME 299 %token <y_name> T_TYPENAME 300 %token <y_val> T_CON 301 %token <y_string> T_STRING 302 303 %type <y_sym> identifier_sym 304 %type <y_name> identifier 305 %type <y_string> string 306 307 %type <y_tnode> primary_expression 308 %type <y_tnode> generic_selection 309 %type <y_generic> generic_assoc_list 310 %type <y_generic> generic_association 311 %type <y_tnode> postfix_expression 312 %type <y_tnode> gcc_statement_expr_list 313 %type <y_tnode> gcc_statement_expr_item 314 %type <y_op> point_or_arrow 315 %type <y_tnode> argument_expression_list 316 %type <y_tnode> unary_expression 317 %type <y_tnode> cast_expression 318 %type <y_tnode> conditional_expression 319 %type <y_tnode> assignment_expression 320 %type <y_tnode> expression_opt 321 %type <y_tnode> expression 322 %type <y_tnode> constant_expr 323 324 %type <y_type> begin_type_typespec 325 %type <y_type> type_specifier 326 %type <y_type> notype_type_specifier 327 %type <y_type> struct_or_union_specifier 328 %type <y_tspec> struct_or_union 329 %type <y_sym> braced_struct_declaration_list 330 %type <y_sym> struct_declaration_list_with_rbrace 331 %type <y_sym> struct_declaration_list 332 %type <y_sym> struct_declaration 333 %type <y_sym> notype_struct_declarators 334 %type <y_sym> type_struct_declarators 335 %type <y_sym> notype_struct_declarator 336 %type <y_sym> type_struct_declarator 337 %type <y_type> enum_specifier 338 %type <y_sym> enum_declaration 339 %type <y_sym> enums_with_opt_comma 340 %type <y_sym> enumerator_list 341 %type <y_sym> enumerator 342 %type <y_qual_ptr> type_qualifier 343 %type <y_qual_ptr> pointer 344 %type <y_qual_ptr> asterisk 345 %type <y_qual_ptr> type_qualifier_list_opt 346 %type <y_qual_ptr> type_qualifier_list 347 %type <y_sym> notype_declarator 348 %type <y_sym> type_declarator 349 %type <y_sym> notype_direct_declarator 350 %type <y_sym> type_direct_declarator 351 %type <y_sym> type_param_declarator 352 %type <y_sym> notype_param_declarator 353 %type <y_sym> direct_param_declarator 354 %type <y_sym> direct_notype_param_declarator 355 %type <y_sym> param_list 356 %type <y_array_size> array_size_opt 357 %type <y_tnode> array_size 358 %type <y_sym> identifier_list 359 %type <y_type> type_name 360 %type <y_sym> abstract_declaration 361 %type <y_sym> abstract_declarator 362 %type <y_sym> direct_abstract_declarator 363 %type <y_sym> abstract_decl_param_list 364 %type <y_sym> vararg_parameter_type_list 365 %type <y_sym> parameter_type_list 366 %type <y_sym> parameter_declaration 367 %type <y_range> range 368 %type <y_name> asm_or_symbolrename_opt 369 370 %type <y_seen_statement> block_item_list 371 %type <y_seen_statement> block_item 372 %type <y_tnode> do_while_expr 373 %type <y_sym> func_declarator 374 %type <y_in_system_header> sys 375 376 %{ 377 #if YYDEBUG && YYBISON 378 static inline void cgram_print(FILE *, int, YYSTYPE); 379 #endif 380 %} 381 382 %% 383 384 program: 385 /* empty */ { 386 /* TODO: Make this an error in C99 mode as well. */ 387 if (!allow_trad && !allow_c99) { 388 /* empty translation unit */ 389 error(272); 390 } else if (allow_c90) { 391 /* empty translation unit */ 392 warning(272); 393 } 394 } 395 | translation_unit 396 ; 397 398 identifier_sym: /* helper for struct/union/enum */ 399 identifier { 400 $$ = getsym($1); 401 } 402 ; 403 404 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 405 identifier: 406 T_NAME { 407 debug_step("cgram: name '%s'", $1->sb_name); 408 $$ = $1; 409 } 410 | T_TYPENAME { 411 debug_step("cgram: typename '%s'", $1->sb_name); 412 $$ = $1; 413 } 414 ; 415 416 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 417 string: 418 T_STRING 419 | string T_STRING { 420 if (!allow_c90) { 421 /* concatenated strings are illegal in traditional C */ 422 warning(219); 423 } 424 $$ = cat_strings($1, $2); 425 } 426 ; 427 428 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 429 primary_expression: 430 T_NAME { 431 bool sys_name, sys_next; 432 sys_name = in_system_header; 433 if (yychar < 0) 434 yychar = yylex(); 435 sys_next = in_system_header; 436 in_system_header = sys_name; 437 $$ = build_name(getsym($1), yychar == T_LPAREN); 438 in_system_header = sys_next; 439 } 440 | T_CON { 441 $$ = build_constant(gettyp($1->v_tspec), $1); 442 } 443 | string { 444 $$ = build_string($1); 445 } 446 | T_LPAREN expression T_RPAREN { 447 if ($2 != NULL) 448 $2->tn_parenthesized = true; 449 $$ = $2; 450 } 451 | generic_selection 452 /* GCC primary-expression, see c_parser_postfix_expression */ 453 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 454 symtyp = FMEMBER; 455 $$ = build_offsetof($3, getsym($5)); 456 } 457 ; 458 459 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 460 generic_selection: 461 T_GENERIC T_LPAREN assignment_expression T_COMMA 462 generic_assoc_list T_RPAREN { 463 /* generic selection requires C11 or later */ 464 c11ism(345); 465 $$ = build_generic_selection($3, $5); 466 } 467 ; 468 469 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 470 generic_assoc_list: 471 generic_association 472 | generic_assoc_list T_COMMA generic_association { 473 $3->ga_prev = $1; 474 $$ = $3; 475 } 476 ; 477 478 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 479 generic_association: 480 type_name T_COLON assignment_expression { 481 $$ = block_zero_alloc(sizeof(*$$)); 482 $$->ga_arg = $1; 483 $$->ga_result = $3; 484 } 485 | T_DEFAULT T_COLON assignment_expression { 486 $$ = block_zero_alloc(sizeof(*$$)); 487 $$->ga_arg = NULL; 488 $$->ga_result = $3; 489 } 490 ; 491 492 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 493 postfix_expression: 494 primary_expression 495 | postfix_expression T_LBRACK sys expression T_RBRACK { 496 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 497 } 498 | postfix_expression T_LPAREN sys T_RPAREN { 499 $$ = build_function_call($1, $3, NULL); 500 } 501 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 502 $$ = build_function_call($1, $3, $4); 503 } 504 | postfix_expression point_or_arrow sys T_NAME { 505 $$ = build_member_access($1, $2, $3, $4); 506 } 507 | postfix_expression T_INCDEC sys { 508 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 509 } 510 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 511 sym_t *tmp = mktempsym($2); 512 begin_initialization(tmp); 513 cgram_declare(tmp, true, NULL); 514 } init_lbrace initializer_list comma_opt init_rbrace { 515 if (!allow_c99) 516 /* compound literals are a C99/GCC extension */ 517 gnuism(319); 518 $$ = build_name(*current_initsym(), false); 519 end_initialization(); 520 } 521 | T_LPAREN compound_statement_lbrace { 522 begin_statement_expr(); 523 } gcc_statement_expr_list { 524 do_statement_expr($4); 525 } compound_statement_rbrace T_RPAREN { 526 $$ = end_statement_expr(); 527 } 528 ; 529 530 comma_opt: /* helper for 'postfix_expression' */ 531 /* empty */ 532 | T_COMMA 533 ; 534 535 /* 536 * The inner part of a GCC statement-expression of the form ({ ... }). 537 * 538 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 539 */ 540 gcc_statement_expr_list: 541 gcc_statement_expr_item 542 | gcc_statement_expr_list gcc_statement_expr_item { 543 $$ = $2; 544 } 545 ; 546 547 gcc_statement_expr_item: 548 declaration_or_error { 549 clear_warning_flags(); 550 $$ = NULL; 551 } 552 | non_expr_statement { 553 $$ = expr_alloc_tnode(); 554 $$->tn_type = gettyp(VOID); 555 } 556 | expression T_SEMI { 557 if ($1 == NULL) { /* in case of syntax errors */ 558 $$ = expr_alloc_tnode(); 559 $$->tn_type = gettyp(VOID); 560 } else { 561 /* XXX: do that only on the last name */ 562 if ($1->tn_op == NAME) 563 $1->tn_sym->s_used = true; 564 expr($1, false, false, false, false); 565 seen_fallthrough = false; 566 $$ = $1; 567 } 568 } 569 ; 570 571 point_or_arrow: /* helper for 'postfix_expression' */ 572 T_POINT { 573 symtyp = FMEMBER; 574 $$ = POINT; 575 } 576 | T_ARROW { 577 symtyp = FMEMBER; 578 $$ = ARROW; 579 } 580 ; 581 582 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 583 argument_expression_list: 584 assignment_expression { 585 $$ = build_function_argument(NULL, $1); 586 } 587 | argument_expression_list T_COMMA assignment_expression { 588 $$ = build_function_argument($1, $3); 589 } 590 ; 591 592 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 593 unary_expression: 594 postfix_expression 595 | T_INCDEC sys unary_expression { 596 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 597 } 598 | T_AMPER sys cast_expression { 599 $$ = build_unary(ADDR, $2, $3); 600 } 601 | T_ASTERISK sys cast_expression { 602 $$ = build_unary(INDIR, $2, $3); 603 } 604 | T_ADDITIVE sys cast_expression { 605 if (!allow_c90 && $1 == PLUS) { 606 /* unary '+' is illegal in traditional C */ 607 warning(100); 608 } 609 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 610 } 611 | T_COMPLEMENT sys cast_expression { 612 $$ = build_unary(COMPL, $2, $3); 613 } 614 | T_LOGNOT sys cast_expression { 615 $$ = build_unary(NOT, $2, $3); 616 } 617 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 618 $$ = build_unary(REAL, $2, $3); 619 } 620 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 621 $$ = build_unary(IMAG, $2, $3); 622 } 623 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 624 $$ = $2; 625 } 626 | T_SIZEOF unary_expression { 627 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 628 if ($$ != NULL) 629 check_expr_misc($2, 630 false, false, false, false, false, true); 631 } 632 | T_SIZEOF T_LPAREN type_name T_RPAREN { 633 $$ = build_sizeof($3); 634 } 635 | T_ALIGNOF unary_expression { 636 /* non type argument to alignof is a GCC extension */ 637 gnuism(349); 638 lint_assert($2 != NULL); 639 $$ = build_alignof($2->tn_type); 640 } 641 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 642 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 643 /* TODO: c11ism */ 644 $$ = build_alignof($3); 645 } 646 ; 647 648 /* The rule 'unary_operator' is inlined into unary_expression. */ 649 650 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 651 cast_expression: 652 unary_expression 653 | T_LPAREN type_name T_RPAREN cast_expression { 654 $$ = cast($4, $2); 655 } 656 ; 657 658 expression_opt: 659 /* empty */ { 660 $$ = NULL; 661 } 662 | expression 663 ; 664 665 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 666 /* 'conditional_expression' also implements 'additive_expression'. */ 667 /* 'conditional_expression' also implements 'shift_expression'. */ 668 /* 'conditional_expression' also implements 'relational_expression'. */ 669 /* 'conditional_expression' also implements 'equality_expression'. */ 670 /* 'conditional_expression' also implements 'AND_expression'. */ 671 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 672 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 673 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 674 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 675 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 676 conditional_expression: 677 cast_expression 678 | conditional_expression T_ASTERISK sys conditional_expression { 679 $$ = build_binary($1, MULT, $3, $4); 680 } 681 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 682 $$ = build_binary($1, $2, $3, $4); 683 } 684 | conditional_expression T_ADDITIVE sys conditional_expression { 685 $$ = build_binary($1, $2, $3, $4); 686 } 687 | conditional_expression T_SHIFT sys conditional_expression { 688 $$ = build_binary($1, $2, $3, $4); 689 } 690 | conditional_expression T_RELATIONAL sys conditional_expression { 691 $$ = build_binary($1, $2, $3, $4); 692 } 693 | conditional_expression T_EQUALITY sys conditional_expression { 694 $$ = build_binary($1, $2, $3, $4); 695 } 696 | conditional_expression T_AMPER sys conditional_expression { 697 $$ = build_binary($1, BITAND, $3, $4); 698 } 699 | conditional_expression T_BITXOR sys conditional_expression { 700 $$ = build_binary($1, BITXOR, $3, $4); 701 } 702 | conditional_expression T_BITOR sys conditional_expression { 703 $$ = build_binary($1, BITOR, $3, $4); 704 } 705 | conditional_expression T_LOGAND sys conditional_expression { 706 $$ = build_binary($1, LOGAND, $3, $4); 707 } 708 | conditional_expression T_LOGOR sys conditional_expression { 709 $$ = build_binary($1, LOGOR, $3, $4); 710 } 711 | conditional_expression T_QUEST sys 712 expression T_COLON sys conditional_expression { 713 $$ = build_binary($1, QUEST, $3, 714 build_binary($4, COLON, $6, $7)); 715 } 716 ; 717 718 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 719 assignment_expression: 720 conditional_expression 721 | unary_expression T_ASSIGN sys assignment_expression { 722 $$ = build_binary($1, ASSIGN, $3, $4); 723 } 724 | unary_expression T_OPASSIGN sys assignment_expression { 725 $$ = build_binary($1, $2, $3, $4); 726 } 727 ; 728 729 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 730 expression: 731 assignment_expression 732 | expression T_COMMA sys assignment_expression { 733 $$ = build_binary($1, COMMA, $3, $4); 734 } 735 ; 736 737 constant_expr_list_opt: /* helper for gcc_attribute */ 738 /* empty */ 739 | constant_expr_list 740 ; 741 742 constant_expr_list: /* helper for gcc_attribute */ 743 constant_expr 744 | constant_expr_list T_COMMA constant_expr 745 ; 746 747 constant_expr: /* C99 6.6 */ 748 conditional_expression 749 ; 750 751 declaration_or_error: 752 declaration 753 | error T_SEMI 754 ; 755 756 declaration: /* C99 6.7 */ 757 begin_type_declmods end_type T_SEMI { 758 if (dcs->d_scl == TYPEDEF) { 759 /* typedef declares no type name */ 760 warning(72); 761 } else { 762 /* empty declaration */ 763 warning(2); 764 } 765 } 766 | begin_type_declmods end_type notype_init_declarators T_SEMI { 767 if (dcs->d_scl == TYPEDEF) { 768 /* syntax error '%s' */ 769 error(249, "missing base type for typedef"); 770 } else { 771 /* old style declaration; add 'int' */ 772 error(1); 773 } 774 } 775 | begin_type_declaration_specifiers end_type T_SEMI { 776 if (dcs->d_scl == TYPEDEF) { 777 /* typedef declares no type name */ 778 warning(72); 779 } else if (!dcs->d_nonempty_decl) { 780 /* empty declaration */ 781 warning(2); 782 } 783 } 784 | begin_type_declaration_specifiers end_type 785 type_init_declarators T_SEMI 786 | static_assert_declaration 787 ; 788 789 begin_type_declaration_specifiers: /* see C99 6.7 */ 790 begin_type_typespec { 791 add_type($1); 792 } 793 | begin_type_declmods type_specifier { 794 add_type($2); 795 } 796 | type_attribute begin_type_declaration_specifiers 797 | begin_type_declaration_specifiers declmod 798 | begin_type_declaration_specifiers notype_type_specifier { 799 add_type($2); 800 } 801 ; 802 803 begin_type_declmods: /* see C99 6.7 */ 804 begin_type T_QUAL { 805 add_qualifier($2); 806 } 807 | begin_type T_SCLASS { 808 add_storage_class($2); 809 } 810 | begin_type_declmods declmod 811 ; 812 813 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 814 begin_type_specifier_qualifier_list_postfix 815 | type_attribute_list begin_type_specifier_qualifier_list_postfix 816 ; 817 818 begin_type_specifier_qualifier_list_postfix: 819 begin_type_typespec { 820 add_type($1); 821 } 822 | begin_type_qualifier_list type_specifier { 823 add_type($2); 824 } 825 | begin_type_specifier_qualifier_list_postfix T_QUAL { 826 add_qualifier($2); 827 } 828 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 829 add_type($2); 830 } 831 | begin_type_specifier_qualifier_list_postfix type_attribute 832 ; 833 834 begin_type_typespec: 835 begin_type notype_type_specifier { 836 $$ = $2; 837 } 838 | begin_type T_TYPENAME { 839 $$ = getsym($2)->s_type; 840 } 841 ; 842 843 begin_type_qualifier_list: 844 begin_type T_QUAL { 845 add_qualifier($2); 846 } 847 | begin_type_qualifier_list T_QUAL { 848 add_qualifier($2); 849 } 850 ; 851 852 declmod: 853 T_QUAL { 854 add_qualifier($1); 855 } 856 | T_SCLASS { 857 add_storage_class($1); 858 } 859 | type_attribute_list 860 ; 861 862 type_attribute_list_opt: 863 /* empty */ 864 | type_attribute_list 865 ; 866 867 type_attribute_list: 868 type_attribute 869 | type_attribute_list type_attribute 870 ; 871 872 type_attribute_opt: 873 /* empty */ 874 | type_attribute 875 ; 876 877 type_attribute: /* See C11 6.7 declaration-specifiers */ 878 gcc_attribute 879 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 880 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 881 | T_PACKED { 882 addpacked(); 883 } 884 | T_NORETURN 885 ; 886 887 begin_type: 888 /* empty */ { 889 begin_type(); 890 } 891 ; 892 893 end_type: 894 /* empty */ { 895 end_type(); 896 } 897 ; 898 899 type_specifier: /* C99 6.7.2 */ 900 notype_type_specifier 901 | T_TYPENAME { 902 $$ = getsym($1)->s_type; 903 } 904 ; 905 906 notype_type_specifier: /* see C99 6.7.2 */ 907 T_TYPE { 908 $$ = gettyp($1); 909 } 910 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 911 $$ = block_dup_type($3->tn_type); 912 $$->t_typeof = true; 913 } 914 | struct_or_union_specifier { 915 end_declaration_level(); 916 $$ = $1; 917 } 918 | enum_specifier { 919 end_declaration_level(); 920 $$ = $1; 921 } 922 ; 923 924 struct_or_union_specifier: /* C99 6.7.2.1 */ 925 struct_or_union identifier_sym { 926 /* 927 * STDC requires that "struct a;" always introduces 928 * a new tag if "a" is not declared at current level 929 * 930 * yychar is valid because otherwise the parser would not 931 * have been able to decide if it must shift or reduce 932 */ 933 $$ = mktag($2, $1, false, yychar == T_SEMI); 934 } 935 | struct_or_union identifier_sym { 936 dcs->d_tagtyp = mktag($2, $1, true, false); 937 } braced_struct_declaration_list { 938 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 939 } 940 | struct_or_union { 941 dcs->d_tagtyp = mktag(NULL, $1, true, false); 942 } braced_struct_declaration_list { 943 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 944 } 945 | struct_or_union error { 946 symtyp = FVFT; 947 $$ = gettyp(INT); 948 } 949 ; 950 951 struct_or_union: /* C99 6.7.2.1 */ 952 T_STRUCT_OR_UNION { 953 symtyp = FTAG; 954 begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); 955 dcs->d_offset_in_bits = 0; 956 dcs->d_sou_align_in_bits = CHAR_SIZE; 957 $$ = $1; 958 } 959 | struct_or_union type_attribute 960 ; 961 962 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 963 struct_declaration_lbrace struct_declaration_list_with_rbrace { 964 $$ = $2; 965 } 966 ; 967 968 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 969 T_LBRACE { 970 symtyp = FVFT; 971 } 972 ; 973 974 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 975 struct_declaration_list T_RBRACE 976 | T_RBRACE { 977 /* XXX: This is not allowed by any C standard. */ 978 $$ = NULL; 979 } 980 ; 981 982 struct_declaration_list: /* C99 6.7.2.1 */ 983 struct_declaration 984 | struct_declaration_list struct_declaration { 985 $$ = lnklst($1, $2); 986 } 987 ; 988 989 struct_declaration: /* C99 6.7.2.1 */ 990 begin_type_qualifier_list end_type { 991 /* ^^ There is no check for the missing type-specifier. */ 992 /* too late, i know, but getsym() compensates it */ 993 symtyp = FMEMBER; 994 } notype_struct_declarators type_attribute_opt T_SEMI { 995 symtyp = FVFT; 996 $$ = $4; 997 } 998 | begin_type_specifier_qualifier_list end_type { 999 symtyp = FMEMBER; 1000 } type_struct_declarators type_attribute_opt T_SEMI { 1001 symtyp = FVFT; 1002 $$ = $4; 1003 } 1004 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1005 /* syntax error '%s' */ 1006 error(249, "member without type"); 1007 $$ = NULL; 1008 } 1009 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1010 T_SEMI { 1011 symtyp = FVFT; 1012 if (!allow_c11 && !allow_gcc) 1013 /* anonymous struct/union members is a C11 feature */ 1014 warning(49); 1015 if (is_struct_or_union(dcs->d_type->t_tspec)) { 1016 $$ = dcs->d_type->t_str->sou_first_member; 1017 /* add all the members of the anonymous struct/union */ 1018 anonymize($$); 1019 } else { 1020 /* syntax error '%s' */ 1021 error(249, "unnamed member"); 1022 $$ = NULL; 1023 } 1024 } 1025 | static_assert_declaration { 1026 $$ = NULL; 1027 } 1028 | error T_SEMI { 1029 symtyp = FVFT; 1030 $$ = NULL; 1031 } 1032 ; 1033 1034 notype_struct_declarators: 1035 notype_struct_declarator { 1036 $$ = declarator_1_struct_union($1); 1037 } 1038 | notype_struct_declarators { 1039 symtyp = FMEMBER; 1040 } T_COMMA type_struct_declarator { 1041 $$ = lnklst($1, declarator_1_struct_union($4)); 1042 } 1043 ; 1044 1045 type_struct_declarators: 1046 type_struct_declarator { 1047 $$ = declarator_1_struct_union($1); 1048 } 1049 | type_struct_declarators { 1050 symtyp = FMEMBER; 1051 } T_COMMA type_struct_declarator { 1052 $$ = lnklst($1, declarator_1_struct_union($4)); 1053 } 1054 ; 1055 1056 notype_struct_declarator: 1057 notype_declarator 1058 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1059 $$ = bitfield($1, to_int_constant($3, true)); 1060 } 1061 | { 1062 symtyp = FVFT; 1063 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1064 $$ = bitfield(NULL, to_int_constant($3, true)); 1065 } 1066 ; 1067 1068 type_struct_declarator: 1069 type_declarator 1070 | type_declarator T_COLON constant_expr { 1071 $$ = bitfield($1, to_int_constant($3, true)); 1072 } 1073 | { 1074 symtyp = FVFT; 1075 } T_COLON constant_expr { 1076 $$ = bitfield(NULL, to_int_constant($3, true)); 1077 } 1078 ; 1079 1080 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1081 enum_specifier: /* C99 6.7.2.2 */ 1082 enum gcc_attribute_list_opt identifier_sym { 1083 $$ = mktag($3, ENUM, false, false); 1084 } 1085 | enum gcc_attribute_list_opt identifier_sym { 1086 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1087 } enum_declaration /*gcc_attribute_list_opt*/ { 1088 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1089 } 1090 | enum gcc_attribute_list_opt { 1091 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1092 } enum_declaration /*gcc_attribute_list_opt*/ { 1093 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1094 } 1095 | enum error { 1096 symtyp = FVFT; 1097 $$ = gettyp(INT); 1098 } 1099 ; 1100 1101 enum: /* helper for C99 6.7.2.2 */ 1102 T_ENUM { 1103 symtyp = FTAG; 1104 begin_declaration_level(DK_ENUM_CONST); 1105 } 1106 ; 1107 1108 enum_declaration: /* helper for C99 6.7.2.2 */ 1109 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1110 $$ = $2; 1111 } 1112 ; 1113 1114 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1115 T_LBRACE { 1116 symtyp = FVFT; 1117 enumval = 0; 1118 } 1119 ; 1120 1121 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1122 enumerator_list 1123 | enumerator_list T_COMMA { 1124 if (!allow_c99 && !allow_trad) { 1125 /* trailing ',' prohibited in enum declaration */ 1126 error(54); 1127 } else { 1128 /* trailing ',' prohibited in enum declaration */ 1129 c99ism(54); 1130 } 1131 $$ = $1; 1132 } 1133 ; 1134 1135 enumerator_list: /* C99 6.7.2.2 */ 1136 enumerator 1137 | enumerator_list T_COMMA enumerator { 1138 $$ = lnklst($1, $3); 1139 } 1140 | error { 1141 $$ = NULL; 1142 } 1143 ; 1144 1145 enumerator: /* C99 6.7.2.2 */ 1146 identifier_sym gcc_attribute_list_opt { 1147 $$ = enumeration_constant($1, enumval, true); 1148 } 1149 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1150 $$ = enumeration_constant($1, to_int_constant($4, true), 1151 false); 1152 } 1153 ; 1154 1155 type_qualifier: /* C99 6.7.3 */ 1156 T_QUAL { 1157 $$ = xcalloc(1, sizeof(*$$)); 1158 if ($1 == CONST) 1159 $$->p_const = true; 1160 if ($1 == VOLATILE) 1161 $$->p_volatile = true; 1162 } 1163 ; 1164 1165 pointer: /* C99 6.7.5 */ 1166 asterisk type_qualifier_list_opt { 1167 $$ = merge_qualified_pointer($1, $2); 1168 } 1169 | asterisk type_qualifier_list_opt pointer { 1170 $$ = merge_qualified_pointer($1, $2); 1171 $$ = merge_qualified_pointer($$, $3); 1172 } 1173 ; 1174 1175 asterisk: /* helper for 'pointer' */ 1176 T_ASTERISK { 1177 $$ = xcalloc(1, sizeof(*$$)); 1178 $$->p_pointer = true; 1179 } 1180 ; 1181 1182 type_qualifier_list_opt: /* see C99 6.7.5 */ 1183 /* empty */ { 1184 $$ = NULL; 1185 } 1186 | type_qualifier_list 1187 ; 1188 1189 type_qualifier_list: /* C99 6.7.5 */ 1190 type_qualifier 1191 | type_qualifier_list type_qualifier { 1192 $$ = merge_qualified_pointer($1, $2); 1193 } 1194 ; 1195 1196 /* 1197 * For an explanation of 'notype' in the following rules, see 1198 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1199 */ 1200 1201 notype_init_declarators: 1202 notype_init_declarator 1203 | notype_init_declarators T_COMMA type_init_declarator 1204 ; 1205 1206 type_init_declarators: 1207 type_init_declarator 1208 | type_init_declarators T_COMMA type_init_declarator 1209 ; 1210 1211 notype_init_declarator: 1212 notype_declarator asm_or_symbolrename_opt { 1213 cgram_declare($1, false, $2); 1214 check_size($1); 1215 } 1216 | notype_declarator asm_or_symbolrename_opt { 1217 begin_initialization($1); 1218 cgram_declare($1, true, $2); 1219 } T_ASSIGN initializer { 1220 check_size($1); 1221 end_initialization(); 1222 } 1223 ; 1224 1225 type_init_declarator: 1226 type_declarator asm_or_symbolrename_opt { 1227 cgram_declare($1, false, $2); 1228 check_size($1); 1229 } 1230 | type_declarator asm_or_symbolrename_opt { 1231 begin_initialization($1); 1232 cgram_declare($1, true, $2); 1233 } T_ASSIGN initializer { 1234 check_size($1); 1235 end_initialization(); 1236 } 1237 ; 1238 1239 notype_declarator: 1240 notype_direct_declarator 1241 | pointer notype_direct_declarator { 1242 $$ = add_pointer($2, $1); 1243 } 1244 ; 1245 1246 type_declarator: 1247 type_direct_declarator 1248 | pointer type_direct_declarator { 1249 $$ = add_pointer($2, $1); 1250 } 1251 ; 1252 1253 notype_direct_declarator: 1254 type_attribute_list_opt T_NAME { 1255 $$ = declarator_name(getsym($2)); 1256 } 1257 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1258 $$ = $3; 1259 } 1260 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1261 $$ = add_array($1, $3.has_dim, $3.dim); 1262 } 1263 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1264 $$ = add_function(symbolrename($1, $3), $2); 1265 end_declaration_level(); 1266 block_level--; 1267 } 1268 | notype_direct_declarator type_attribute 1269 ; 1270 1271 type_direct_declarator: 1272 type_attribute_list_opt identifier { 1273 $$ = declarator_name(getsym($2)); 1274 } 1275 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1276 $$ = $3; 1277 } 1278 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1279 $$ = add_array($1, $3.has_dim, $3.dim); 1280 } 1281 | type_direct_declarator param_list asm_or_symbolrename_opt { 1282 $$ = add_function(symbolrename($1, $3), $2); 1283 end_declaration_level(); 1284 block_level--; 1285 } 1286 | type_direct_declarator type_attribute 1287 ; 1288 1289 /* 1290 * The two distinct rules type_param_declarator and notype_param_declarator 1291 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1292 * always treated as a typename, not an argument name. For example, after 1293 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1294 * "f(int (double));", not "f(int a);". 1295 */ 1296 type_param_declarator: 1297 direct_param_declarator 1298 | pointer direct_param_declarator { 1299 $$ = add_pointer($2, $1); 1300 } 1301 ; 1302 1303 notype_param_declarator: 1304 direct_notype_param_declarator 1305 | pointer direct_notype_param_declarator { 1306 $$ = add_pointer($2, $1); 1307 } 1308 ; 1309 1310 direct_param_declarator: 1311 identifier type_attribute_list { 1312 $$ = declarator_name(getsym($1)); 1313 } 1314 | identifier { 1315 $$ = declarator_name(getsym($1)); 1316 } 1317 | T_LPAREN notype_param_declarator T_RPAREN { 1318 $$ = $2; 1319 } 1320 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1321 gcc_attribute_list_opt { 1322 $$ = add_array($1, $3.has_dim, $3.dim); 1323 } 1324 | direct_param_declarator param_list asm_or_symbolrename_opt { 1325 $$ = add_function(symbolrename($1, $3), $2); 1326 end_declaration_level(); 1327 block_level--; 1328 } 1329 ; 1330 1331 direct_notype_param_declarator: 1332 identifier { 1333 $$ = declarator_name(getsym($1)); 1334 } 1335 | T_LPAREN notype_param_declarator T_RPAREN { 1336 $$ = $2; 1337 } 1338 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1339 $$ = add_array($1, $3.has_dim, $3.dim); 1340 } 1341 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1342 $$ = add_function(symbolrename($1, $3), $2); 1343 end_declaration_level(); 1344 block_level--; 1345 } 1346 ; 1347 1348 param_list: 1349 id_list_lparen identifier_list T_RPAREN { 1350 $$ = $2; 1351 } 1352 | abstract_decl_param_list 1353 ; 1354 1355 id_list_lparen: 1356 T_LPAREN { 1357 block_level++; 1358 begin_declaration_level(DK_PROTO_ARG); 1359 } 1360 ; 1361 1362 array_size_opt: 1363 /* empty */ { 1364 $$.has_dim = false; 1365 $$.dim = 0; 1366 } 1367 | T_ASTERISK { 1368 /* since C99; variable length array of unspecified size */ 1369 $$.has_dim = false; /* TODO: maybe change to true */ 1370 $$.dim = 0; /* just as a placeholder */ 1371 } 1372 | array_size { 1373 $$.has_dim = true; 1374 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1375 } 1376 ; 1377 1378 array_size: 1379 type_qualifier_list_opt T_SCLASS constant_expr { 1380 /* C11 6.7.6.3p7 */ 1381 if ($2 != STATIC) 1382 yyerror("Bad attribute"); 1383 /* static array size is a C11 extension */ 1384 c11ism(343); 1385 $$ = $3; 1386 } 1387 | T_QUAL { 1388 /* C11 6.7.6.2 */ 1389 if ($1 != RESTRICT) 1390 yyerror("Bad attribute"); 1391 $$ = NULL; 1392 } 1393 | constant_expr 1394 ; 1395 1396 identifier_list: /* C99 6.7.5 */ 1397 T_NAME { 1398 $$ = old_style_function_name(getsym($1)); 1399 } 1400 | identifier_list T_COMMA T_NAME { 1401 $$ = lnklst($1, old_style_function_name(getsym($3))); 1402 } 1403 | identifier_list error 1404 ; 1405 1406 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1407 type_name: /* C99 6.7.6 */ 1408 { 1409 begin_declaration_level(DK_ABSTRACT); 1410 } abstract_declaration { 1411 end_declaration_level(); 1412 $$ = $2->s_type; 1413 } 1414 ; 1415 1416 abstract_declaration: /* specific to lint */ 1417 begin_type_qualifier_list end_type { 1418 $$ = declare_1_abstract(abstract_name()); 1419 } 1420 | begin_type_specifier_qualifier_list end_type { 1421 $$ = declare_1_abstract(abstract_name()); 1422 } 1423 | begin_type_qualifier_list end_type abstract_declarator { 1424 $$ = declare_1_abstract($3); 1425 } 1426 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1427 $$ = declare_1_abstract($3); 1428 } 1429 ; 1430 1431 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1432 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1433 abstract_declarator: 1434 pointer { 1435 $$ = add_pointer(abstract_name(), $1); 1436 } 1437 | direct_abstract_declarator 1438 | pointer direct_abstract_declarator { 1439 $$ = add_pointer($2, $1); 1440 } 1441 | type_attribute_list direct_abstract_declarator { 1442 $$ = $2; 1443 } 1444 | pointer type_attribute_list direct_abstract_declarator { 1445 $$ = add_pointer($3, $1); 1446 } 1447 ; 1448 1449 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1450 direct_abstract_declarator: 1451 /* TODO: sort rules according to C99 */ 1452 T_LPAREN abstract_declarator T_RPAREN { 1453 $$ = $2; 1454 } 1455 | T_LBRACK array_size_opt T_RBRACK { 1456 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1457 } 1458 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1459 $$ = add_array($1, $3.has_dim, $3.dim); 1460 } 1461 | abstract_decl_param_list asm_or_symbolrename_opt { 1462 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1463 end_declaration_level(); 1464 block_level--; 1465 } 1466 | direct_abstract_declarator abstract_decl_param_list 1467 asm_or_symbolrename_opt { 1468 $$ = add_function(symbolrename($1, $3), $2); 1469 end_declaration_level(); 1470 block_level--; 1471 } 1472 | direct_abstract_declarator type_attribute_list 1473 ; 1474 1475 abstract_decl_param_list: /* specific to lint */ 1476 abstract_decl_lparen T_RPAREN type_attribute_opt { 1477 $$ = NULL; 1478 } 1479 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1480 type_attribute_opt { 1481 dcs->d_proto = true; 1482 $$ = $2; 1483 } 1484 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1485 $$ = NULL; 1486 } 1487 ; 1488 1489 abstract_decl_lparen: /* specific to lint */ 1490 T_LPAREN { 1491 block_level++; 1492 begin_declaration_level(DK_PROTO_ARG); 1493 } 1494 ; 1495 1496 vararg_parameter_type_list: /* specific to lint */ 1497 parameter_type_list 1498 | parameter_type_list T_COMMA T_ELLIPSIS { 1499 dcs->d_vararg = true; 1500 $$ = $1; 1501 } 1502 | T_ELLIPSIS { 1503 /* TODO: C99 6.7.5 makes this an error as well. */ 1504 if (!allow_trad && !allow_c99) { 1505 /* ANSI C requires formal parameter before '...' */ 1506 error(84); 1507 } else if (allow_c90) { 1508 /* ANSI C requires formal parameter before '...' */ 1509 warning(84); 1510 } 1511 dcs->d_vararg = true; 1512 $$ = NULL; 1513 } 1514 ; 1515 1516 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1517 parameter_type_list: 1518 parameter_declaration 1519 | parameter_type_list T_COMMA parameter_declaration { 1520 $$ = lnklst($1, $3); 1521 } 1522 ; 1523 1524 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1525 parameter_declaration: 1526 begin_type_declmods end_type { 1527 /* ^^ There is no check for the missing type-specifier. */ 1528 $$ = declare_argument(abstract_name(), false); 1529 } 1530 | begin_type_declaration_specifiers end_type { 1531 $$ = declare_argument(abstract_name(), false); 1532 } 1533 | begin_type_declmods end_type notype_param_declarator { 1534 /* ^^ There is no check for the missing type-specifier. */ 1535 $$ = declare_argument($3, false); 1536 } 1537 /* 1538 * type_param_declarator is needed because of following conflict: 1539 * "typedef int a; f(int (a));" could be parsed as 1540 * "function with argument a of type int", or 1541 * "function with an abstract argument of type function". 1542 * This grammar realizes the second case. 1543 */ 1544 | begin_type_declaration_specifiers end_type type_param_declarator { 1545 $$ = declare_argument($3, false); 1546 } 1547 | begin_type_declmods end_type abstract_declarator { 1548 /* ^^ There is no check for the missing type-specifier. */ 1549 $$ = declare_argument($3, false); 1550 } 1551 | begin_type_declaration_specifiers end_type abstract_declarator { 1552 $$ = declare_argument($3, false); 1553 } 1554 ; 1555 1556 initializer: /* C99 6.7.8 "Initialization" */ 1557 assignment_expression { 1558 init_expr($1); 1559 } 1560 | init_lbrace init_rbrace { 1561 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1562 } 1563 | init_lbrace initializer_list comma_opt init_rbrace 1564 /* XXX: What is this error handling for? */ 1565 | error 1566 ; 1567 1568 initializer_list: /* C99 6.7.8 "Initialization" */ 1569 initializer_list_item 1570 | initializer_list T_COMMA initializer_list_item 1571 ; 1572 1573 initializer_list_item: /* helper */ 1574 designation initializer 1575 | initializer 1576 ; 1577 1578 designation: /* C99 6.7.8 "Initialization" */ 1579 begin_designation designator_list T_ASSIGN 1580 | identifier T_COLON { 1581 /* GCC style struct or union member name in initializer */ 1582 gnuism(315); 1583 begin_designation(); 1584 add_designator_member($1); 1585 } 1586 ; 1587 1588 begin_designation: /* lint-specific helper */ 1589 /* empty */ { 1590 begin_designation(); 1591 } 1592 ; 1593 1594 designator_list: /* C99 6.7.8 "Initialization" */ 1595 designator 1596 | designator_list designator 1597 ; 1598 1599 designator: /* C99 6.7.8 "Initialization" */ 1600 T_LBRACK range T_RBRACK { 1601 if (!allow_c99) 1602 /* array initializer with designators is a C99 ... */ 1603 warning(321); 1604 add_designator_subscript($2); 1605 } 1606 | T_POINT identifier { 1607 if (!allow_c99) 1608 /* struct or union member name in initializer is ... */ 1609 warning(313); 1610 add_designator_member($2); 1611 } 1612 ; 1613 1614 static_assert_declaration: 1615 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1616 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1617 ; 1618 1619 range: 1620 constant_expr { 1621 $$.lo = to_int_constant($1, true); 1622 $$.hi = $$.lo; 1623 } 1624 | constant_expr T_ELLIPSIS constant_expr { 1625 $$.lo = to_int_constant($1, true); 1626 $$.hi = to_int_constant($3, true); 1627 /* initialization with '[a...b]' is a GCC extension */ 1628 gnuism(340); 1629 } 1630 ; 1631 1632 init_lbrace: /* helper */ 1633 T_LBRACE { 1634 init_lbrace(); 1635 } 1636 ; 1637 1638 init_rbrace: /* helper */ 1639 T_RBRACE { 1640 init_rbrace(); 1641 } 1642 ; 1643 1644 asm_or_symbolrename_opt: /* GCC extensions */ 1645 /* empty */ { 1646 $$ = NULL; 1647 } 1648 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1649 freeyyv(&$3, T_STRING); 1650 $$ = NULL; 1651 } 1652 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1653 $$ = $3; 1654 } 1655 ; 1656 1657 statement: /* C99 6.8 */ 1658 expression_statement 1659 | non_expr_statement 1660 ; 1661 1662 non_expr_statement: /* helper for C99 6.8 */ 1663 gcc_attribute /* ((__fallthrough__)) */ T_SEMI 1664 | labeled_statement 1665 | compound_statement 1666 | selection_statement 1667 | iteration_statement 1668 | jump_statement { 1669 seen_fallthrough = false; 1670 } 1671 | asm_statement 1672 ; 1673 1674 labeled_statement: /* C99 6.8.1 */ 1675 label gcc_attribute_list_opt statement 1676 ; 1677 1678 label: 1679 T_NAME T_COLON { 1680 symtyp = FLABEL; 1681 named_label(getsym($1)); 1682 } 1683 | T_CASE constant_expr T_COLON { 1684 case_label($2); 1685 seen_fallthrough = true; 1686 } 1687 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1688 /* XXX: We don't fill all cases */ 1689 case_label($2); 1690 seen_fallthrough = true; 1691 } 1692 | T_DEFAULT T_COLON { 1693 default_label(); 1694 seen_fallthrough = true; 1695 } 1696 ; 1697 1698 compound_statement: /* C99 6.8.2 */ 1699 compound_statement_lbrace compound_statement_rbrace 1700 | compound_statement_lbrace block_item_list compound_statement_rbrace 1701 ; 1702 1703 compound_statement_lbrace: 1704 T_LBRACE { 1705 block_level++; 1706 mem_block_level++; 1707 begin_declaration_level(DK_AUTO); 1708 } 1709 ; 1710 1711 compound_statement_rbrace: 1712 T_RBRACE { 1713 end_declaration_level(); 1714 level_free_all(mem_block_level); 1715 mem_block_level--; 1716 block_level--; 1717 seen_fallthrough = false; 1718 } 1719 ; 1720 1721 block_item_list: /* C99 6.8.2 */ 1722 block_item 1723 | block_item_list block_item { 1724 if ($1 && !$2) 1725 /* declarations after statements is a C99 feature */ 1726 c99ism(327); 1727 $$ = $1 || $2; 1728 } 1729 ; 1730 1731 block_item: /* C99 6.8.2 */ 1732 declaration_or_error { 1733 $$ = false; 1734 restore_warning_flags(); 1735 } 1736 | statement { 1737 $$ = true; 1738 restore_warning_flags(); 1739 } 1740 ; 1741 1742 expression_statement: /* C99 6.8.3 */ 1743 expression T_SEMI { 1744 expr($1, false, false, false, false); 1745 seen_fallthrough = false; 1746 } 1747 | T_SEMI { 1748 check_statement_reachable(); 1749 seen_fallthrough = false; 1750 } 1751 ; 1752 1753 selection_statement: /* C99 6.8.4 */ 1754 if_without_else %prec T_THEN { 1755 save_warning_flags(); 1756 if2(); 1757 if3(false); 1758 } 1759 | if_without_else T_ELSE { 1760 save_warning_flags(); 1761 if2(); 1762 } statement { 1763 clear_warning_flags(); 1764 if3(true); 1765 } 1766 | if_without_else T_ELSE error { 1767 clear_warning_flags(); 1768 if3(false); 1769 } 1770 | switch_expr statement { 1771 clear_warning_flags(); 1772 switch2(); 1773 } 1774 | switch_expr error { 1775 clear_warning_flags(); 1776 switch2(); 1777 } 1778 ; 1779 1780 if_without_else: /* see C99 6.8.4 */ 1781 if_expr statement 1782 | if_expr error 1783 ; 1784 1785 if_expr: /* see C99 6.8.4 */ 1786 T_IF T_LPAREN expression T_RPAREN { 1787 if1($3); 1788 clear_warning_flags(); 1789 } 1790 ; 1791 1792 switch_expr: /* see C99 6.8.4 */ 1793 T_SWITCH T_LPAREN expression T_RPAREN { 1794 switch1($3); 1795 clear_warning_flags(); 1796 } 1797 ; 1798 1799 iteration_statement: /* C99 6.8.5 */ 1800 while_expr statement { 1801 clear_warning_flags(); 1802 while2(); 1803 } 1804 | while_expr error { 1805 clear_warning_flags(); 1806 while2(); 1807 } 1808 | do_statement do_while_expr { 1809 do2($2); 1810 seen_fallthrough = false; 1811 } 1812 | do error { 1813 clear_warning_flags(); 1814 do2(NULL); 1815 } 1816 | for_exprs statement { 1817 clear_warning_flags(); 1818 for2(); 1819 end_declaration_level(); 1820 block_level--; 1821 } 1822 | for_exprs error { 1823 clear_warning_flags(); 1824 for2(); 1825 end_declaration_level(); 1826 block_level--; 1827 } 1828 ; 1829 1830 while_expr: /* see C99 6.8.5 */ 1831 T_WHILE T_LPAREN expression T_RPAREN { 1832 while1($3); 1833 clear_warning_flags(); 1834 } 1835 ; 1836 1837 do_statement: /* see C99 6.8.5 */ 1838 do statement { 1839 clear_warning_flags(); 1840 } 1841 ; 1842 1843 do: /* see C99 6.8.5 */ 1844 T_DO { 1845 do1(); 1846 } 1847 ; 1848 1849 do_while_expr: /* see C99 6.8.5 */ 1850 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1851 $$ = $3; 1852 } 1853 ; 1854 1855 for_start: /* see C99 6.8.5 */ 1856 T_FOR T_LPAREN { 1857 begin_declaration_level(DK_AUTO); 1858 block_level++; 1859 } 1860 ; 1861 1862 for_exprs: /* see C99 6.8.5 */ 1863 for_start 1864 begin_type_declaration_specifiers end_type 1865 notype_init_declarators T_SEMI 1866 expression_opt T_SEMI 1867 expression_opt T_RPAREN { 1868 /* variable declaration in for loop */ 1869 c99ism(325); 1870 for1(NULL, $6, $8); 1871 clear_warning_flags(); 1872 } 1873 | for_start 1874 expression_opt T_SEMI 1875 expression_opt T_SEMI 1876 expression_opt T_RPAREN { 1877 for1($2, $4, $6); 1878 clear_warning_flags(); 1879 } 1880 ; 1881 1882 jump_statement: /* C99 6.8.6 */ 1883 goto identifier T_SEMI { 1884 do_goto(getsym($2)); 1885 } 1886 | goto error T_SEMI { 1887 symtyp = FVFT; 1888 } 1889 | T_CONTINUE T_SEMI { 1890 do_continue(); 1891 } 1892 | T_BREAK T_SEMI { 1893 do_break(); 1894 } 1895 | T_RETURN sys T_SEMI { 1896 do_return($2, NULL); 1897 } 1898 | T_RETURN sys expression T_SEMI { 1899 do_return($2, $3); 1900 } 1901 ; 1902 1903 goto: /* see C99 6.8.6 */ 1904 T_GOTO { 1905 symtyp = FLABEL; 1906 } 1907 ; 1908 1909 asm_statement: /* GCC extension */ 1910 T_ASM T_LPAREN read_until_rparen T_SEMI { 1911 setasm(); 1912 } 1913 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1914 setasm(); 1915 } 1916 | T_ASM error 1917 ; 1918 1919 read_until_rparen: /* helper for 'asm_statement' */ 1920 /* empty */ { 1921 read_until_rparen(); 1922 } 1923 ; 1924 1925 translation_unit: /* C99 6.9 */ 1926 external_declaration 1927 | translation_unit external_declaration 1928 ; 1929 1930 external_declaration: /* C99 6.9 */ 1931 function_definition { 1932 global_clean_up_decl(false); 1933 clear_warning_flags(); 1934 } 1935 | top_level_declaration { 1936 global_clean_up_decl(false); 1937 clear_warning_flags(); 1938 } 1939 | asm_statement /* GCC extension */ 1940 | T_SEMI { /* GCC extension */ 1941 /* 1942 * TODO: Only allow this in GCC mode, not in plain C99. 1943 * This is one of the top 10 warnings in the NetBSD build. 1944 */ 1945 if (!allow_trad && !allow_c99) { 1946 /* empty declaration */ 1947 error(0); 1948 } else if (allow_c90) { 1949 /* empty declaration */ 1950 warning(0); 1951 } 1952 } 1953 ; 1954 1955 /* 1956 * On the top level, lint allows several forms of declarations that it doesn't 1957 * allow in functions. For example, a single ';' is an empty declaration and 1958 * is supported by some compilers, but in a function it would be an empty 1959 * statement, not a declaration. This makes a difference in C90 mode, where 1960 * a statement must not be followed by a declaration. 1961 * 1962 * See 'declaration' for all other declarations. 1963 */ 1964 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1965 begin_type end_type notype_init_declarators T_SEMI { 1966 /* TODO: Make this an error in C99 mode as well. */ 1967 if (!allow_trad && !allow_c99) { 1968 /* old style declaration; add 'int' */ 1969 error(1); 1970 } else if (allow_c90) { 1971 /* old style declaration; add 'int' */ 1972 warning(1); 1973 } 1974 } 1975 | declaration 1976 | error T_SEMI { 1977 global_clean_up(); 1978 } 1979 | error T_RBRACE { 1980 global_clean_up(); 1981 } 1982 ; 1983 1984 function_definition: /* C99 6.9.1 */ 1985 func_declarator { 1986 if ($1->s_type->t_tspec != FUNC) { 1987 /* syntax error '%s' */ 1988 error(249, yytext); 1989 YYERROR; 1990 } 1991 if ($1->s_type->t_typedef) { 1992 /* ()-less function definition */ 1993 error(64); 1994 YYERROR; 1995 } 1996 funcdef($1); 1997 block_level++; 1998 begin_declaration_level(DK_OLD_STYLE_ARG); 1999 if (lwarn == LWARN_NONE) 2000 $1->s_used = true; 2001 } arg_declaration_list_opt { 2002 end_declaration_level(); 2003 block_level--; 2004 check_func_lint_directives(); 2005 check_func_old_style_arguments(); 2006 begin_control_statement(CS_FUNCTION_BODY); 2007 } compound_statement { 2008 funcend(); 2009 end_control_statement(CS_FUNCTION_BODY); 2010 } 2011 ; 2012 2013 func_declarator: 2014 begin_type end_type notype_declarator { 2015 if (!allow_trad) { 2016 /* old style declaration; add 'int' */ 2017 error(1); 2018 } 2019 $$ = $3; 2020 } 2021 | begin_type_declmods end_type notype_declarator { 2022 if (!allow_trad) { 2023 /* old style declaration; add 'int' */ 2024 error(1); 2025 } 2026 $$ = $3; 2027 } 2028 | begin_type_declaration_specifiers end_type type_declarator { 2029 $$ = $3; 2030 } 2031 ; 2032 2033 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2034 /* empty */ 2035 | arg_declaration_list 2036 ; 2037 2038 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2039 arg_declaration 2040 | arg_declaration_list arg_declaration 2041 /* XXX or better "arg_declaration error" ? */ 2042 | error 2043 ; 2044 2045 /* 2046 * "arg_declaration" is separated from "declaration" because it 2047 * needs other error handling. 2048 */ 2049 arg_declaration: 2050 begin_type_declmods end_type T_SEMI { 2051 /* empty declaration */ 2052 warning(2); 2053 } 2054 | begin_type_declmods end_type notype_init_declarators T_SEMI 2055 | begin_type_declaration_specifiers end_type T_SEMI { 2056 if (!dcs->d_nonempty_decl) { 2057 /* empty declaration */ 2058 warning(2); 2059 } else { 2060 /* '%s' declared in argument declaration list */ 2061 warning(3, type_name(dcs->d_type)); 2062 } 2063 } 2064 | begin_type_declaration_specifiers end_type 2065 type_init_declarators T_SEMI { 2066 if (dcs->d_nonempty_decl) { 2067 /* '%s' declared in argument declaration list */ 2068 warning(3, type_name(dcs->d_type)); 2069 } 2070 } 2071 | begin_type_declmods error 2072 | begin_type_declaration_specifiers error 2073 ; 2074 2075 gcc_attribute_list_opt: 2076 /* empty */ 2077 | gcc_attribute_list 2078 ; 2079 2080 gcc_attribute_list: 2081 gcc_attribute 2082 | gcc_attribute_list gcc_attribute 2083 ; 2084 2085 gcc_attribute: 2086 T_ATTRIBUTE T_LPAREN T_LPAREN { 2087 in_gcc_attribute = true; 2088 } gcc_attribute_spec_list { 2089 in_gcc_attribute = false; 2090 } T_RPAREN T_RPAREN 2091 ; 2092 2093 gcc_attribute_spec_list: 2094 gcc_attribute_spec 2095 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2096 ; 2097 2098 gcc_attribute_spec: 2099 /* empty */ 2100 | T_AT_ALWAYS_INLINE 2101 | T_AT_ALIAS T_LPAREN string T_RPAREN 2102 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2103 | T_AT_ALIGNED 2104 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2105 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2106 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2107 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2108 | T_AT_COLD 2109 | T_AT_COMMON 2110 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2111 | T_AT_CONSTRUCTOR 2112 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2113 | T_AT_DEPRECATED 2114 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2115 | T_AT_DESTRUCTOR 2116 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2117 | T_AT_FALLTHROUGH { 2118 fallthru(1); 2119 } 2120 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2121 constant_expr T_COMMA constant_expr T_RPAREN 2122 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2123 | T_AT_GNU_INLINE 2124 | T_AT_HOT 2125 | T_AT_MALLOC 2126 | T_AT_MAY_ALIAS 2127 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2128 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2129 | T_AT_NO_SANITIZE_THREAD 2130 | T_AT_NOINLINE 2131 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2132 | T_AT_NONNULL 2133 | T_AT_NONSTRING 2134 | T_AT_NORETURN 2135 | T_AT_NOTHROW 2136 | T_AT_NO_INSTRUMENT_FUNCTION 2137 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2138 | T_AT_OPTNONE 2139 | T_AT_PACKED { 2140 addpacked(); 2141 } 2142 | T_AT_PCS T_LPAREN string T_RPAREN 2143 | T_AT_PURE 2144 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2145 | T_AT_RETURNS_NONNULL 2146 | T_AT_RETURNS_TWICE 2147 | T_AT_SECTION T_LPAREN string T_RPAREN 2148 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2149 | T_AT_SENTINEL 2150 | T_AT_TARGET T_LPAREN string T_RPAREN 2151 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2152 | T_AT_TUNION 2153 | T_AT_UNUSED { 2154 add_attr_used(); 2155 } 2156 | T_AT_USED { 2157 add_attr_used(); 2158 } 2159 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2160 | T_AT_WARN_UNUSED_RESULT 2161 | T_AT_WEAK 2162 | T_QUAL { 2163 if ($1 != CONST) 2164 yyerror("Bad attribute"); 2165 } 2166 ; 2167 2168 gcc_attribute_bounded: 2169 T_AT_MINBYTES 2170 | T_AT_STRING 2171 | T_AT_BUFFER 2172 ; 2173 2174 gcc_attribute_format: 2175 T_AT_FORMAT_GNU_PRINTF 2176 | T_AT_FORMAT_PRINTF 2177 | T_AT_FORMAT_SCANF 2178 | T_AT_FORMAT_STRFMON 2179 | T_AT_FORMAT_STRFTIME 2180 | T_AT_FORMAT_SYSLOG 2181 ; 2182 2183 sys: 2184 /* empty */ { 2185 $$ = in_system_header; 2186 } 2187 ; 2188 2189 %% 2190 2191 /* ARGSUSED */ 2192 int 2193 yyerror(const char *msg) 2194 { 2195 /* syntax error '%s' */ 2196 error(249, yytext); 2197 if (++sytxerr >= 5) 2198 norecover(); 2199 return 0; 2200 } 2201 2202 #if YYDEBUG && (YYBYACC || YYBISON) 2203 static const char * 2204 cgram_to_string(int token, YYSTYPE val) 2205 { 2206 2207 switch (token) { 2208 case T_INCDEC: 2209 case T_MULTIPLICATIVE: 2210 case T_ADDITIVE: 2211 case T_SHIFT: 2212 case T_RELATIONAL: 2213 case T_EQUALITY: 2214 case T_OPASSIGN: 2215 return modtab[val.y_op].m_name; 2216 case T_SCLASS: 2217 return scl_name(val.y_scl); 2218 case T_TYPE: 2219 case T_STRUCT_OR_UNION: 2220 return tspec_name(val.y_tspec); 2221 case T_QUAL: 2222 return tqual_name(val.y_tqual); 2223 case T_NAME: 2224 return val.y_name->sb_name; 2225 default: 2226 return "<none>"; 2227 } 2228 } 2229 #endif 2230 2231 #if YYDEBUG && YYBISON 2232 static inline void 2233 cgram_print(FILE *output, int token, YYSTYPE val) 2234 { 2235 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2236 } 2237 #endif 2238 2239 static void 2240 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2241 { 2242 declare(decl, initflg, renaming); 2243 if (renaming != NULL) 2244 freeyyv(&renaming, T_NAME); 2245 } 2246 2247 /* 2248 * Discard all input tokens up to and including the next 2249 * unmatched right paren 2250 */ 2251 static void 2252 read_until_rparen(void) 2253 { 2254 int level; 2255 2256 if (yychar < 0) 2257 yychar = yylex(); 2258 freeyyv(&yylval, yychar); 2259 2260 level = 1; 2261 while (yychar != T_RPAREN || --level > 0) { 2262 if (yychar == T_LPAREN) { 2263 level++; 2264 } else if (yychar <= 0) { 2265 break; 2266 } 2267 freeyyv(&yylval, yychar = yylex()); 2268 } 2269 2270 yyclearin; 2271 } 2272 2273 static sym_t * 2274 symbolrename(sym_t *s, sbuf_t *sb) 2275 { 2276 if (sb != NULL) 2277 s->s_rename = sb->sb_name; 2278 return s; 2279 } 2280
Indexes created Fri Oct 03 02:09:57 GMT 2025