cgram.y revision 1.411
1 %{ 2 /* $NetBSD: cgram.y,v 1.411 2022/05/12 00:28:01 rillig Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. 6 * Copyright (c) 1994, 1995 Jochen Pohl 7 * All Rights Reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Jochen Pohl for 20 * The NetBSD Project. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) && !defined(lint) 38 __RCSID("$NetBSD: cgram.y,v 1.411 2022/05/12 00:28:01 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 static int olwarn = LWARN_BAD; 68 69 static void cgram_declare(sym_t *, bool, sbuf_t *); 70 static void read_until_rparen(void); 71 static sym_t *symbolrename(sym_t *, sbuf_t *); 72 73 74 #ifdef DEBUG 75 static void 76 CLEAR_WARN_FLAGS(const char *file, size_t line) 77 { 78 debug_step("%s:%zu: clearing flags", file, line); 79 clear_warn_flags(); 80 olwarn = LWARN_BAD; 81 } 82 83 static void 84 SAVE_WARN_FLAGS(const char *file, size_t line) 85 { 86 lint_assert(olwarn == LWARN_BAD); 87 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 88 olwarn = lwarn; 89 } 90 91 static void 92 RESTORE_WARN_FLAGS(const char *file, size_t line) 93 { 94 if (olwarn != LWARN_BAD) { 95 lwarn = olwarn; 96 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 97 olwarn = LWARN_BAD; 98 } else 99 CLEAR_WARN_FLAGS(file, line); 100 } 101 #else 102 #define CLEAR_WARN_FLAGS(f, l) clear_warn_flags(), olwarn = LWARN_BAD 103 #define SAVE_WARN_FLAGS(f, l) olwarn = lwarn 104 #define RESTORE_WARN_FLAGS(f, l) \ 105 (void)(olwarn == LWARN_BAD ? (clear_warn_flags(), 0) : (lwarn = olwarn)) 106 #endif 107 108 #define clear_warning_flags() CLEAR_WARN_FLAGS(__FILE__, __LINE__) 109 #define save_warning_flags() SAVE_WARN_FLAGS(__FILE__, __LINE__) 110 #define restore_warning_flags() RESTORE_WARN_FLAGS(__FILE__, __LINE__) 111 112 /* unbind the anonymous struct members from the struct */ 113 static void 114 anonymize(sym_t *s) 115 { 116 for ( ; s != NULL; s = s->s_next) 117 s->u.s_member.sm_sou_type = NULL; 118 } 119 120 #if YYDEBUG && (YYBYACC || YYBISON) 121 #define YYSTYPE_TOSTRING cgram_to_string 122 #endif 123 #if YYDEBUG && YYBISON 124 #define YYPRINT cgram_print 125 #endif 126 127 %} 128 129 %expect 129 130 131 %union { 132 val_t *y_val; 133 sbuf_t *y_name; 134 sym_t *y_sym; 135 op_t y_op; 136 scl_t y_scl; 137 tspec_t y_tspec; 138 tqual_t y_tqual; 139 type_t *y_type; 140 tnode_t *y_tnode; 141 range_t y_range; 142 strg_t *y_string; 143 qual_ptr *y_qual_ptr; 144 bool y_seen_statement; 145 struct generic_association *y_generic; 146 struct array_size y_array_size; 147 bool y_in_system_header; 148 }; 149 150 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 151 %token T_POINT T_ARROW 152 %token T_COMPLEMENT T_LOGNOT 153 %token <y_op> T_INCDEC 154 %token T_SIZEOF 155 %token T_BUILTIN_OFFSETOF 156 %token T_TYPEOF 157 %token T_EXTENSION 158 %token T_ALIGNAS 159 %token T_ALIGNOF 160 %token T_ASTERISK 161 %token <y_op> T_MULTIPLICATIVE 162 %token <y_op> T_ADDITIVE 163 %token <y_op> T_SHIFT 164 %token <y_op> T_RELATIONAL 165 %token <y_op> T_EQUALITY 166 %token T_AMPER 167 %token T_BITXOR 168 %token T_BITOR 169 %token T_LOGAND 170 %token T_LOGOR 171 %token T_QUEST 172 %token T_COLON 173 %token T_ASSIGN 174 %token <y_op> T_OPASSIGN 175 %token T_COMMA 176 %token T_SEMI 177 %token T_ELLIPSIS 178 %token T_REAL 179 %token T_IMAG 180 %token T_GENERIC 181 %token T_NORETURN 182 183 /* storage classes (extern, static, auto, register and typedef) */ 184 %token <y_scl> T_SCLASS 185 186 /* 187 * predefined type keywords (char, int, short, long, unsigned, signed, 188 * float, double, void); see T_TYPENAME for types from typedef 189 */ 190 %token <y_tspec> T_TYPE 191 192 /* qualifiers (const, volatile, restrict, _Thread_local) */ 193 %token <y_tqual> T_QUAL 194 195 /* struct or union */ 196 %token <y_tspec> T_STRUCT_OR_UNION 197 198 /* remaining keywords */ 199 %token T_ASM 200 %token T_BREAK 201 %token T_CASE 202 %token T_CONTINUE 203 %token T_DEFAULT 204 %token T_DO 205 %token T_ELSE 206 %token T_ENUM 207 %token T_FOR 208 %token T_GOTO 209 %token T_IF 210 %token T_PACKED 211 %token T_RETURN 212 %token T_SWITCH 213 %token T_SYMBOLRENAME 214 %token T_WHILE 215 %token T_STATIC_ASSERT 216 217 %token T_ATTRIBUTE 218 %token T_AT_ALIAS 219 %token T_AT_ALIGNED 220 %token T_AT_ALLOC_SIZE 221 %token T_AT_ALWAYS_INLINE 222 %token T_AT_BOUNDED 223 %token T_AT_BUFFER 224 %token T_AT_COLD 225 %token T_AT_COMMON 226 %token T_AT_CONSTRUCTOR 227 %token T_AT_DEPRECATED 228 %token T_AT_DESTRUCTOR 229 %token T_AT_DISABLE_SANITIZER_INSTRUMENTATION 230 %token T_AT_FALLTHROUGH 231 %token T_AT_FORMAT 232 %token T_AT_FORMAT_ARG 233 %token T_AT_FORMAT_GNU_PRINTF 234 %token T_AT_FORMAT_PRINTF 235 %token T_AT_FORMAT_SCANF 236 %token T_AT_FORMAT_STRFMON 237 %token T_AT_FORMAT_STRFTIME 238 %token T_AT_FORMAT_SYSLOG 239 %token T_AT_GNU_INLINE 240 %token T_AT_HOT 241 %token T_AT_MALLOC 242 %token T_AT_MAY_ALIAS 243 %token T_AT_MINBYTES 244 %token T_AT_MODE 245 %token T_AT_NO_SANITIZE 246 %token T_AT_NO_SANITIZE_THREAD 247 %token T_AT_NOINLINE 248 %token T_AT_NONNULL 249 %token T_AT_NONSTRING 250 %token T_AT_NORETURN 251 %token T_AT_NOTHROW 252 %token T_AT_NO_INSTRUMENT_FUNCTION 253 %token T_AT_OPTIMIZE 254 %token T_AT_OPTNONE 255 %token T_AT_PACKED 256 %token T_AT_PCS 257 %token T_AT_PURE 258 %token T_AT_REGPARM 259 %token T_AT_RETURNS_NONNULL 260 %token T_AT_RETURNS_TWICE 261 %token T_AT_SECTION 262 %token T_AT_SENTINEL 263 %token T_AT_STRING 264 %token T_AT_TARGET 265 %token T_AT_TLS_MODEL 266 %token T_AT_TUNION 267 %token T_AT_UNUSED 268 %token T_AT_USED 269 %token T_AT_VISIBILITY 270 %token T_AT_WARN_UNUSED_RESULT 271 %token T_AT_WEAK 272 273 %left T_THEN 274 %left T_ELSE 275 %right T_QUEST T_COLON 276 %left T_LOGOR 277 %left T_LOGAND 278 %left T_BITOR 279 %left T_BITXOR 280 %left T_AMPER 281 %left T_EQUALITY 282 %left T_RELATIONAL 283 %left T_SHIFT 284 %left T_ADDITIVE 285 %left T_ASTERISK T_MULTIPLICATIVE 286 287 %token <y_name> T_NAME 288 %token <y_name> T_TYPENAME 289 %token <y_val> T_CON 290 %token <y_string> T_STRING 291 292 %type <y_sym> identifier_sym 293 %type <y_name> identifier 294 %type <y_string> string 295 296 %type <y_tnode> primary_expression 297 %type <y_tnode> generic_selection 298 %type <y_generic> generic_assoc_list 299 %type <y_generic> generic_association 300 %type <y_tnode> postfix_expression 301 %type <y_tnode> gcc_statement_expr_list 302 %type <y_tnode> gcc_statement_expr_item 303 %type <y_op> point_or_arrow 304 %type <y_tnode> argument_expression_list 305 %type <y_tnode> unary_expression 306 %type <y_tnode> cast_expression 307 %type <y_tnode> conditional_expression 308 %type <y_tnode> assignment_expression 309 %type <y_tnode> expression_opt 310 %type <y_tnode> expression 311 %type <y_tnode> constant_expr 312 313 %type <y_type> begin_type_typespec 314 %type <y_type> type_specifier 315 %type <y_type> notype_type_specifier 316 %type <y_type> struct_or_union_specifier 317 %type <y_tspec> struct_or_union 318 %type <y_sym> braced_struct_declaration_list 319 %type <y_sym> struct_declaration_list_with_rbrace 320 %type <y_sym> struct_declaration_list 321 %type <y_sym> struct_declaration 322 %type <y_sym> notype_struct_declarators 323 %type <y_sym> type_struct_declarators 324 %type <y_sym> notype_struct_declarator 325 %type <y_sym> type_struct_declarator 326 %type <y_type> enum_specifier 327 %type <y_sym> enum_declaration 328 %type <y_sym> enums_with_opt_comma 329 %type <y_sym> enumerator_list 330 %type <y_sym> enumerator 331 %type <y_qual_ptr> type_qualifier 332 %type <y_qual_ptr> pointer 333 %type <y_qual_ptr> asterisk 334 %type <y_qual_ptr> type_qualifier_list_opt 335 %type <y_qual_ptr> type_qualifier_list 336 %type <y_sym> notype_declarator 337 %type <y_sym> type_declarator 338 %type <y_sym> notype_direct_declarator 339 %type <y_sym> type_direct_declarator 340 %type <y_sym> type_param_declarator 341 %type <y_sym> notype_param_declarator 342 %type <y_sym> direct_param_declarator 343 %type <y_sym> direct_notype_param_declarator 344 %type <y_sym> param_list 345 %type <y_array_size> array_size_opt 346 %type <y_tnode> array_size 347 %type <y_sym> identifier_list 348 %type <y_type> type_name 349 %type <y_sym> abstract_declaration 350 %type <y_sym> abstract_declarator 351 %type <y_sym> direct_abstract_declarator 352 %type <y_sym> abstract_decl_param_list 353 %type <y_sym> vararg_parameter_type_list 354 %type <y_sym> parameter_type_list 355 %type <y_sym> parameter_declaration 356 %type <y_range> range 357 %type <y_name> asm_or_symbolrename_opt 358 359 %type <y_seen_statement> block_item_list 360 %type <y_seen_statement> block_item 361 %type <y_tnode> do_while_expr 362 %type <y_sym> func_declarator 363 %type <y_in_system_header> sys 364 365 %{ 366 #if YYDEBUG && YYBISON 367 static inline void cgram_print(FILE *, int, YYSTYPE); 368 #endif 369 %} 370 371 %% 372 373 program: 374 /* empty */ { 375 /* TODO: Make this an error in C99 mode as well. */ 376 if (!allow_trad && !allow_c99) { 377 /* empty translation unit */ 378 error(272); 379 } else if (allow_c90) { 380 /* empty translation unit */ 381 warning(272); 382 } 383 } 384 | translation_unit 385 ; 386 387 identifier_sym: /* helper for struct/union/enum */ 388 identifier { 389 $$ = getsym($1); 390 } 391 ; 392 393 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 394 identifier: 395 T_NAME { 396 debug_step("cgram: name '%s'", $1->sb_name); 397 $$ = $1; 398 } 399 | T_TYPENAME { 400 debug_step("cgram: typename '%s'", $1->sb_name); 401 $$ = $1; 402 } 403 ; 404 405 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 406 string: 407 T_STRING 408 | string T_STRING { 409 if (!allow_c90) { 410 /* concatenated strings are illegal in traditional C */ 411 warning(219); 412 } 413 $$ = cat_strings($1, $2); 414 } 415 ; 416 417 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 418 primary_expression: 419 T_NAME { 420 bool sys_name, sys_next; 421 sys_name = in_system_header; 422 if (yychar < 0) 423 yychar = yylex(); 424 sys_next = in_system_header; 425 in_system_header = sys_name; 426 $$ = build_name(getsym($1), yychar == T_LPAREN); 427 in_system_header = sys_next; 428 } 429 | T_CON { 430 $$ = build_constant(gettyp($1->v_tspec), $1); 431 } 432 | string { 433 $$ = build_string($1); 434 } 435 | T_LPAREN expression T_RPAREN { 436 if ($2 != NULL) 437 $2->tn_parenthesized = true; 438 $$ = $2; 439 } 440 | generic_selection 441 /* GCC primary-expression, see c_parser_postfix_expression */ 442 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 443 symtyp = FMEMBER; 444 $$ = build_offsetof($3, getsym($5)); 445 } 446 ; 447 448 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 449 generic_selection: 450 T_GENERIC T_LPAREN assignment_expression T_COMMA 451 generic_assoc_list T_RPAREN { 452 /* generic selection requires C11 or later */ 453 c11ism(345); 454 $$ = build_generic_selection($3, $5); 455 } 456 ; 457 458 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 459 generic_assoc_list: 460 generic_association 461 | generic_assoc_list T_COMMA generic_association { 462 $3->ga_prev = $1; 463 $$ = $3; 464 } 465 ; 466 467 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 468 generic_association: 469 type_name T_COLON assignment_expression { 470 $$ = block_zero_alloc(sizeof(*$$)); 471 $$->ga_arg = $1; 472 $$->ga_result = $3; 473 } 474 | T_DEFAULT T_COLON assignment_expression { 475 $$ = block_zero_alloc(sizeof(*$$)); 476 $$->ga_arg = NULL; 477 $$->ga_result = $3; 478 } 479 ; 480 481 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 482 postfix_expression: 483 primary_expression 484 | postfix_expression T_LBRACK sys expression T_RBRACK { 485 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 486 } 487 | postfix_expression T_LPAREN sys T_RPAREN { 488 $$ = build_function_call($1, $3, NULL); 489 } 490 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 491 $$ = build_function_call($1, $3, $4); 492 } 493 | postfix_expression point_or_arrow sys T_NAME { 494 $$ = build_member_access($1, $2, $3, $4); 495 } 496 | postfix_expression T_INCDEC sys { 497 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 498 } 499 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 500 sym_t *tmp = mktempsym($2); 501 begin_initialization(tmp); 502 cgram_declare(tmp, true, NULL); 503 } init_lbrace initializer_list comma_opt init_rbrace { 504 if (!allow_c99) 505 /* compound literals are a C99/GCC extension */ 506 gnuism(319); 507 $$ = build_name(*current_initsym(), false); 508 end_initialization(); 509 } 510 | T_LPAREN compound_statement_lbrace { 511 begin_statement_expr(); 512 } gcc_statement_expr_list { 513 do_statement_expr($4); 514 } compound_statement_rbrace T_RPAREN { 515 $$ = end_statement_expr(); 516 } 517 ; 518 519 comma_opt: /* helper for 'postfix_expression' */ 520 /* empty */ 521 | T_COMMA 522 ; 523 524 /* 525 * The inner part of a GCC statement-expression of the form ({ ... }). 526 * 527 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 528 */ 529 gcc_statement_expr_list: 530 gcc_statement_expr_item 531 | gcc_statement_expr_list gcc_statement_expr_item { 532 $$ = $2; 533 } 534 ; 535 536 gcc_statement_expr_item: 537 declaration_or_error { 538 clear_warning_flags(); 539 $$ = NULL; 540 } 541 | non_expr_statement { 542 $$ = expr_alloc_tnode(); 543 $$->tn_type = gettyp(VOID); 544 } 545 | expression T_SEMI { 546 if ($1 == NULL) { /* in case of syntax errors */ 547 $$ = expr_alloc_tnode(); 548 $$->tn_type = gettyp(VOID); 549 } else { 550 /* XXX: do that only on the last name */ 551 if ($1->tn_op == NAME) 552 $1->tn_sym->s_used = true; 553 expr($1, false, false, false, false); 554 seen_fallthrough = false; 555 $$ = $1; 556 } 557 } 558 ; 559 560 point_or_arrow: /* helper for 'postfix_expression' */ 561 T_POINT { 562 symtyp = FMEMBER; 563 $$ = POINT; 564 } 565 | T_ARROW { 566 symtyp = FMEMBER; 567 $$ = ARROW; 568 } 569 ; 570 571 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 572 argument_expression_list: 573 assignment_expression { 574 $$ = build_function_argument(NULL, $1); 575 } 576 | argument_expression_list T_COMMA assignment_expression { 577 $$ = build_function_argument($1, $3); 578 } 579 ; 580 581 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 582 unary_expression: 583 postfix_expression 584 | T_INCDEC sys unary_expression { 585 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 586 } 587 | T_AMPER sys cast_expression { 588 $$ = build_unary(ADDR, $2, $3); 589 } 590 | T_ASTERISK sys cast_expression { 591 $$ = build_unary(INDIR, $2, $3); 592 } 593 | T_ADDITIVE sys cast_expression { 594 if (!allow_c90 && $1 == PLUS) { 595 /* unary + is illegal in traditional C */ 596 warning(100); 597 } 598 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 599 } 600 | T_COMPLEMENT sys cast_expression { 601 $$ = build_unary(COMPL, $2, $3); 602 } 603 | T_LOGNOT sys cast_expression { 604 $$ = build_unary(NOT, $2, $3); 605 } 606 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 607 $$ = build_unary(REAL, $2, $3); 608 } 609 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 610 $$ = build_unary(IMAG, $2, $3); 611 } 612 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 613 $$ = $2; 614 } 615 | T_SIZEOF unary_expression { 616 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 617 if ($$ != NULL) 618 check_expr_misc($2, 619 false, false, false, false, false, true); 620 } 621 | T_SIZEOF T_LPAREN type_name T_RPAREN { 622 $$ = build_sizeof($3); 623 } 624 /* GCC extension */ 625 | T_ALIGNOF unary_expression { 626 lint_assert($2 != NULL); 627 $$ = build_alignof($2->tn_type); 628 } 629 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 630 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 631 /* TODO: c11ism */ 632 $$ = build_alignof($3); 633 } 634 ; 635 636 /* The rule 'unary_operator' is inlined into unary_expression. */ 637 638 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 639 cast_expression: 640 unary_expression 641 | T_LPAREN type_name T_RPAREN cast_expression { 642 $$ = cast($4, $2); 643 } 644 ; 645 646 expression_opt: 647 /* empty */ { 648 $$ = NULL; 649 } 650 | expression 651 ; 652 653 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 654 /* 'conditional_expression' also implements 'additive_expression'. */ 655 /* 'conditional_expression' also implements 'shift_expression'. */ 656 /* 'conditional_expression' also implements 'relational_expression'. */ 657 /* 'conditional_expression' also implements 'equality_expression'. */ 658 /* 'conditional_expression' also implements 'AND_expression'. */ 659 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 660 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 661 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 662 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 663 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 664 conditional_expression: 665 cast_expression 666 | conditional_expression T_ASTERISK sys conditional_expression { 667 $$ = build_binary($1, MULT, $3, $4); 668 } 669 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 670 $$ = build_binary($1, $2, $3, $4); 671 } 672 | conditional_expression T_ADDITIVE sys conditional_expression { 673 $$ = build_binary($1, $2, $3, $4); 674 } 675 | conditional_expression T_SHIFT sys conditional_expression { 676 $$ = build_binary($1, $2, $3, $4); 677 } 678 | conditional_expression T_RELATIONAL sys conditional_expression { 679 $$ = build_binary($1, $2, $3, $4); 680 } 681 | conditional_expression T_EQUALITY sys conditional_expression { 682 $$ = build_binary($1, $2, $3, $4); 683 } 684 | conditional_expression T_AMPER sys conditional_expression { 685 $$ = build_binary($1, BITAND, $3, $4); 686 } 687 | conditional_expression T_BITXOR sys conditional_expression { 688 $$ = build_binary($1, BITXOR, $3, $4); 689 } 690 | conditional_expression T_BITOR sys conditional_expression { 691 $$ = build_binary($1, BITOR, $3, $4); 692 } 693 | conditional_expression T_LOGAND sys conditional_expression { 694 $$ = build_binary($1, LOGAND, $3, $4); 695 } 696 | conditional_expression T_LOGOR sys conditional_expression { 697 $$ = build_binary($1, LOGOR, $3, $4); 698 } 699 | conditional_expression T_QUEST sys 700 expression T_COLON sys conditional_expression { 701 $$ = build_binary($1, QUEST, $3, 702 build_binary($4, COLON, $6, $7)); 703 } 704 ; 705 706 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 707 assignment_expression: 708 conditional_expression 709 | unary_expression T_ASSIGN sys assignment_expression { 710 $$ = build_binary($1, ASSIGN, $3, $4); 711 } 712 | unary_expression T_OPASSIGN sys assignment_expression { 713 $$ = build_binary($1, $2, $3, $4); 714 } 715 ; 716 717 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 718 expression: 719 assignment_expression 720 | expression T_COMMA sys assignment_expression { 721 $$ = build_binary($1, COMMA, $3, $4); 722 } 723 ; 724 725 constant_expr_list_opt: /* helper for gcc_attribute */ 726 /* empty */ 727 | constant_expr_list 728 ; 729 730 constant_expr_list: /* helper for gcc_attribute */ 731 constant_expr 732 | constant_expr_list T_COMMA constant_expr 733 ; 734 735 constant_expr: /* C99 6.6 */ 736 conditional_expression 737 ; 738 739 declaration_or_error: 740 declaration 741 | error T_SEMI 742 ; 743 744 declaration: /* C99 6.7 */ 745 begin_type_declmods end_type T_SEMI { 746 if (dcs->d_scl == TYPEDEF) { 747 /* typedef declares no type name */ 748 warning(72); 749 } else { 750 /* empty declaration */ 751 warning(2); 752 } 753 } 754 | begin_type_declmods end_type notype_init_declarators T_SEMI { 755 if (dcs->d_scl == TYPEDEF) { 756 /* syntax error '%s' */ 757 error(249, "missing base type for typedef"); 758 } else { 759 /* old style declaration; add 'int' */ 760 error(1); 761 } 762 } 763 | begin_type_declaration_specifiers end_type T_SEMI { 764 if (dcs->d_scl == TYPEDEF) { 765 /* typedef declares no type name */ 766 warning(72); 767 } else if (!dcs->d_nonempty_decl) { 768 /* empty declaration */ 769 warning(2); 770 } 771 } 772 | begin_type_declaration_specifiers end_type 773 type_init_declarators T_SEMI 774 | static_assert_declaration 775 ; 776 777 begin_type_declaration_specifiers: /* see C99 6.7 */ 778 begin_type_typespec { 779 add_type($1); 780 } 781 | begin_type_declmods type_specifier { 782 add_type($2); 783 } 784 | type_attribute begin_type_declaration_specifiers 785 | begin_type_declaration_specifiers declmod 786 | begin_type_declaration_specifiers notype_type_specifier { 787 add_type($2); 788 } 789 ; 790 791 begin_type_declmods: /* see C99 6.7 */ 792 begin_type T_QUAL { 793 add_qualifier($2); 794 } 795 | begin_type T_SCLASS { 796 add_storage_class($2); 797 } 798 | begin_type_declmods declmod 799 ; 800 801 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 802 begin_type_specifier_qualifier_list_postfix 803 | type_attribute_list begin_type_specifier_qualifier_list_postfix 804 ; 805 806 begin_type_specifier_qualifier_list_postfix: 807 begin_type_typespec { 808 add_type($1); 809 } 810 | begin_type_qualifier_list type_specifier { 811 add_type($2); 812 } 813 | begin_type_specifier_qualifier_list_postfix T_QUAL { 814 add_qualifier($2); 815 } 816 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 817 add_type($2); 818 } 819 | begin_type_specifier_qualifier_list_postfix type_attribute 820 ; 821 822 begin_type_typespec: 823 begin_type notype_type_specifier { 824 $$ = $2; 825 } 826 | begin_type T_TYPENAME { 827 $$ = getsym($2)->s_type; 828 } 829 ; 830 831 begin_type_qualifier_list: 832 begin_type T_QUAL { 833 add_qualifier($2); 834 } 835 | begin_type_qualifier_list T_QUAL { 836 add_qualifier($2); 837 } 838 ; 839 840 declmod: 841 T_QUAL { 842 add_qualifier($1); 843 } 844 | T_SCLASS { 845 add_storage_class($1); 846 } 847 | type_attribute_list 848 ; 849 850 type_attribute_list_opt: 851 /* empty */ 852 | type_attribute_list 853 ; 854 855 type_attribute_list: 856 type_attribute 857 | type_attribute_list type_attribute 858 ; 859 860 type_attribute_opt: 861 /* empty */ 862 | type_attribute 863 ; 864 865 type_attribute: /* See C11 6.7 declaration-specifiers */ 866 gcc_attribute 867 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 868 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 869 | T_PACKED { 870 addpacked(); 871 } 872 | T_NORETURN 873 ; 874 875 begin_type: 876 /* empty */ { 877 begin_type(); 878 } 879 ; 880 881 end_type: 882 /* empty */ { 883 end_type(); 884 } 885 ; 886 887 type_specifier: /* C99 6.7.2 */ 888 notype_type_specifier 889 | T_TYPENAME { 890 $$ = getsym($1)->s_type; 891 } 892 ; 893 894 notype_type_specifier: /* see C99 6.7.2 */ 895 T_TYPE { 896 $$ = gettyp($1); 897 } 898 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 899 $$ = block_dup_type($3->tn_type); 900 $$->t_typeof = true; 901 } 902 | struct_or_union_specifier { 903 end_declaration_level(); 904 $$ = $1; 905 } 906 | enum_specifier { 907 end_declaration_level(); 908 $$ = $1; 909 } 910 ; 911 912 struct_or_union_specifier: /* C99 6.7.2.1 */ 913 struct_or_union identifier_sym { 914 /* 915 * STDC requires that "struct a;" always introduces 916 * a new tag if "a" is not declared at current level 917 * 918 * yychar is valid because otherwise the parser would not 919 * have been able to decide if it must shift or reduce 920 */ 921 $$ = mktag($2, $1, false, yychar == T_SEMI); 922 } 923 | struct_or_union identifier_sym { 924 dcs->d_tagtyp = mktag($2, $1, true, false); 925 } braced_struct_declaration_list { 926 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 927 } 928 | struct_or_union { 929 dcs->d_tagtyp = mktag(NULL, $1, true, false); 930 } braced_struct_declaration_list { 931 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 932 } 933 | struct_or_union error { 934 symtyp = FVFT; 935 $$ = gettyp(INT); 936 } 937 ; 938 939 struct_or_union: /* C99 6.7.2.1 */ 940 T_STRUCT_OR_UNION { 941 symtyp = FTAG; 942 begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); 943 dcs->d_offset_in_bits = 0; 944 dcs->d_sou_align_in_bits = CHAR_SIZE; 945 $$ = $1; 946 } 947 | struct_or_union type_attribute 948 ; 949 950 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 951 struct_declaration_lbrace struct_declaration_list_with_rbrace { 952 $$ = $2; 953 } 954 ; 955 956 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 957 T_LBRACE { 958 symtyp = FVFT; 959 } 960 ; 961 962 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 963 struct_declaration_list T_RBRACE 964 | T_RBRACE { 965 /* XXX: This is not allowed by any C standard. */ 966 $$ = NULL; 967 } 968 ; 969 970 struct_declaration_list: /* C99 6.7.2.1 */ 971 struct_declaration 972 | struct_declaration_list struct_declaration { 973 $$ = lnklst($1, $2); 974 } 975 ; 976 977 struct_declaration: /* C99 6.7.2.1 */ 978 begin_type_qualifier_list end_type { 979 /* ^^ There is no check for the missing type-specifier. */ 980 /* too late, i know, but getsym() compensates it */ 981 symtyp = FMEMBER; 982 } notype_struct_declarators type_attribute_opt T_SEMI { 983 symtyp = FVFT; 984 $$ = $4; 985 } 986 | begin_type_specifier_qualifier_list end_type { 987 symtyp = FMEMBER; 988 } type_struct_declarators type_attribute_opt T_SEMI { 989 symtyp = FVFT; 990 $$ = $4; 991 } 992 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 993 /* syntax error '%s' */ 994 error(249, "member without type"); 995 $$ = NULL; 996 } 997 | begin_type_specifier_qualifier_list end_type type_attribute_opt 998 T_SEMI { 999 symtyp = FVFT; 1000 if (!allow_c11 && !allow_gcc) 1001 /* anonymous struct/union members is a C11 feature */ 1002 warning(49); 1003 if (is_struct_or_union(dcs->d_type->t_tspec)) { 1004 $$ = dcs->d_type->t_str->sou_first_member; 1005 /* add all the members of the anonymous struct/union */ 1006 anonymize($$); 1007 } else { 1008 /* syntax error '%s' */ 1009 error(249, "unnamed member"); 1010 $$ = NULL; 1011 } 1012 } 1013 | static_assert_declaration { 1014 $$ = NULL; 1015 } 1016 | error T_SEMI { 1017 symtyp = FVFT; 1018 $$ = NULL; 1019 } 1020 ; 1021 1022 notype_struct_declarators: 1023 notype_struct_declarator { 1024 $$ = declarator_1_struct_union($1); 1025 } 1026 | notype_struct_declarators { 1027 symtyp = FMEMBER; 1028 } T_COMMA type_struct_declarator { 1029 $$ = lnklst($1, declarator_1_struct_union($4)); 1030 } 1031 ; 1032 1033 type_struct_declarators: 1034 type_struct_declarator { 1035 $$ = declarator_1_struct_union($1); 1036 } 1037 | type_struct_declarators { 1038 symtyp = FMEMBER; 1039 } T_COMMA type_struct_declarator { 1040 $$ = lnklst($1, declarator_1_struct_union($4)); 1041 } 1042 ; 1043 1044 notype_struct_declarator: 1045 notype_declarator 1046 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1047 $$ = bitfield($1, to_int_constant($3, true)); 1048 } 1049 | { 1050 symtyp = FVFT; 1051 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1052 $$ = bitfield(NULL, to_int_constant($3, true)); 1053 } 1054 ; 1055 1056 type_struct_declarator: 1057 type_declarator 1058 | type_declarator T_COLON constant_expr { 1059 $$ = bitfield($1, to_int_constant($3, true)); 1060 } 1061 | { 1062 symtyp = FVFT; 1063 } T_COLON constant_expr { 1064 $$ = bitfield(NULL, to_int_constant($3, true)); 1065 } 1066 ; 1067 1068 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1069 enum_specifier: /* C99 6.7.2.2 */ 1070 enum gcc_attribute_list_opt identifier_sym { 1071 $$ = mktag($3, ENUM, false, false); 1072 } 1073 | enum gcc_attribute_list_opt identifier_sym { 1074 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1075 } enum_declaration /*gcc_attribute_list_opt*/ { 1076 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1077 } 1078 | enum gcc_attribute_list_opt { 1079 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1080 } enum_declaration /*gcc_attribute_list_opt*/ { 1081 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1082 } 1083 | enum error { 1084 symtyp = FVFT; 1085 $$ = gettyp(INT); 1086 } 1087 ; 1088 1089 enum: /* helper for C99 6.7.2.2 */ 1090 T_ENUM { 1091 symtyp = FTAG; 1092 begin_declaration_level(DK_ENUM_CONST); 1093 } 1094 ; 1095 1096 enum_declaration: /* helper for C99 6.7.2.2 */ 1097 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1098 $$ = $2; 1099 } 1100 ; 1101 1102 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1103 T_LBRACE { 1104 symtyp = FVFT; 1105 enumval = 0; 1106 } 1107 ; 1108 1109 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1110 enumerator_list 1111 | enumerator_list T_COMMA { 1112 if (!allow_c99 && !allow_trad) { 1113 /* trailing ',' prohibited in enum declaration */ 1114 error(54); 1115 } else { 1116 /* trailing ',' prohibited in enum declaration */ 1117 c99ism(54); 1118 } 1119 $$ = $1; 1120 } 1121 ; 1122 1123 enumerator_list: /* C99 6.7.2.2 */ 1124 enumerator 1125 | enumerator_list T_COMMA enumerator { 1126 $$ = lnklst($1, $3); 1127 } 1128 | error { 1129 $$ = NULL; 1130 } 1131 ; 1132 1133 enumerator: /* C99 6.7.2.2 */ 1134 identifier_sym gcc_attribute_list_opt { 1135 $$ = enumeration_constant($1, enumval, true); 1136 } 1137 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1138 $$ = enumeration_constant($1, to_int_constant($4, true), 1139 false); 1140 } 1141 ; 1142 1143 type_qualifier: /* C99 6.7.3 */ 1144 T_QUAL { 1145 $$ = xcalloc(1, sizeof(*$$)); 1146 if ($1 == CONST) 1147 $$->p_const = true; 1148 if ($1 == VOLATILE) 1149 $$->p_volatile = true; 1150 } 1151 ; 1152 1153 pointer: /* C99 6.7.5 */ 1154 asterisk type_qualifier_list_opt { 1155 $$ = merge_qualified_pointer($1, $2); 1156 } 1157 | asterisk type_qualifier_list_opt pointer { 1158 $$ = merge_qualified_pointer($1, $2); 1159 $$ = merge_qualified_pointer($$, $3); 1160 } 1161 ; 1162 1163 asterisk: /* helper for 'pointer' */ 1164 T_ASTERISK { 1165 $$ = xcalloc(1, sizeof(*$$)); 1166 $$->p_pointer = true; 1167 } 1168 ; 1169 1170 type_qualifier_list_opt: /* see C99 6.7.5 */ 1171 /* empty */ { 1172 $$ = NULL; 1173 } 1174 | type_qualifier_list 1175 ; 1176 1177 type_qualifier_list: /* C99 6.7.5 */ 1178 type_qualifier 1179 | type_qualifier_list type_qualifier { 1180 $$ = merge_qualified_pointer($1, $2); 1181 } 1182 ; 1183 1184 /* 1185 * For an explanation of 'notype' in the following rules, see 1186 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1187 */ 1188 1189 notype_init_declarators: 1190 notype_init_declarator 1191 | notype_init_declarators T_COMMA type_init_declarator 1192 ; 1193 1194 type_init_declarators: 1195 type_init_declarator 1196 | type_init_declarators T_COMMA type_init_declarator 1197 ; 1198 1199 notype_init_declarator: 1200 notype_declarator asm_or_symbolrename_opt { 1201 cgram_declare($1, false, $2); 1202 check_size($1); 1203 } 1204 | notype_declarator asm_or_symbolrename_opt { 1205 begin_initialization($1); 1206 cgram_declare($1, true, $2); 1207 } T_ASSIGN initializer { 1208 check_size($1); 1209 end_initialization(); 1210 } 1211 ; 1212 1213 type_init_declarator: 1214 type_declarator asm_or_symbolrename_opt { 1215 cgram_declare($1, false, $2); 1216 check_size($1); 1217 } 1218 | type_declarator asm_or_symbolrename_opt { 1219 begin_initialization($1); 1220 cgram_declare($1, true, $2); 1221 } T_ASSIGN initializer { 1222 check_size($1); 1223 end_initialization(); 1224 } 1225 ; 1226 1227 notype_declarator: 1228 notype_direct_declarator 1229 | pointer notype_direct_declarator { 1230 $$ = add_pointer($2, $1); 1231 } 1232 ; 1233 1234 type_declarator: 1235 type_direct_declarator 1236 | pointer type_direct_declarator { 1237 $$ = add_pointer($2, $1); 1238 } 1239 ; 1240 1241 notype_direct_declarator: 1242 type_attribute_list_opt T_NAME { 1243 $$ = declarator_name(getsym($2)); 1244 } 1245 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1246 $$ = $3; 1247 } 1248 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1249 $$ = add_array($1, $3.has_dim, $3.dim); 1250 } 1251 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1252 $$ = add_function(symbolrename($1, $3), $2); 1253 end_declaration_level(); 1254 block_level--; 1255 } 1256 | notype_direct_declarator type_attribute 1257 ; 1258 1259 type_direct_declarator: 1260 type_attribute_list_opt identifier { 1261 $$ = declarator_name(getsym($2)); 1262 } 1263 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1264 $$ = $3; 1265 } 1266 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1267 $$ = add_array($1, $3.has_dim, $3.dim); 1268 } 1269 | type_direct_declarator param_list asm_or_symbolrename_opt { 1270 $$ = add_function(symbolrename($1, $3), $2); 1271 end_declaration_level(); 1272 block_level--; 1273 } 1274 | type_direct_declarator type_attribute 1275 ; 1276 1277 /* 1278 * The two distinct rules type_param_declarator and notype_param_declarator 1279 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1280 * always treated as a typename, not an argument name. For example, after 1281 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1282 * "f(int (double));", not "f(int a);". 1283 */ 1284 type_param_declarator: 1285 direct_param_declarator 1286 | pointer direct_param_declarator { 1287 $$ = add_pointer($2, $1); 1288 } 1289 ; 1290 1291 notype_param_declarator: 1292 direct_notype_param_declarator 1293 | pointer direct_notype_param_declarator { 1294 $$ = add_pointer($2, $1); 1295 } 1296 ; 1297 1298 direct_param_declarator: 1299 identifier type_attribute_list { 1300 $$ = declarator_name(getsym($1)); 1301 } 1302 | identifier { 1303 $$ = declarator_name(getsym($1)); 1304 } 1305 | T_LPAREN notype_param_declarator T_RPAREN { 1306 $$ = $2; 1307 } 1308 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1309 gcc_attribute_list_opt { 1310 $$ = add_array($1, $3.has_dim, $3.dim); 1311 } 1312 | direct_param_declarator param_list asm_or_symbolrename_opt { 1313 $$ = add_function(symbolrename($1, $3), $2); 1314 end_declaration_level(); 1315 block_level--; 1316 } 1317 ; 1318 1319 direct_notype_param_declarator: 1320 identifier { 1321 $$ = declarator_name(getsym($1)); 1322 } 1323 | T_LPAREN notype_param_declarator T_RPAREN { 1324 $$ = $2; 1325 } 1326 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1327 $$ = add_array($1, $3.has_dim, $3.dim); 1328 } 1329 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1330 $$ = add_function(symbolrename($1, $3), $2); 1331 end_declaration_level(); 1332 block_level--; 1333 } 1334 ; 1335 1336 param_list: 1337 id_list_lparen identifier_list T_RPAREN { 1338 $$ = $2; 1339 } 1340 | abstract_decl_param_list 1341 ; 1342 1343 id_list_lparen: 1344 T_LPAREN { 1345 block_level++; 1346 begin_declaration_level(DK_PROTO_ARG); 1347 } 1348 ; 1349 1350 array_size_opt: 1351 /* empty */ { 1352 $$.has_dim = false; 1353 $$.dim = 0; 1354 } 1355 | T_ASTERISK { 1356 /* since C99; variable length array of unspecified size */ 1357 $$.has_dim = false; /* TODO: maybe change to true */ 1358 $$.dim = 0; /* just as a placeholder */ 1359 } 1360 | array_size { 1361 $$.has_dim = true; 1362 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1363 } 1364 ; 1365 1366 array_size: 1367 type_qualifier_list_opt T_SCLASS constant_expr { 1368 /* C11 6.7.6.3p7 */ 1369 if ($2 != STATIC) 1370 yyerror("Bad attribute"); 1371 /* static array size is a C11 extension */ 1372 c11ism(343); 1373 $$ = $3; 1374 } 1375 | T_QUAL { 1376 /* C11 6.7.6.2 */ 1377 if ($1 != RESTRICT) 1378 yyerror("Bad attribute"); 1379 $$ = NULL; 1380 } 1381 | constant_expr 1382 ; 1383 1384 identifier_list: /* C99 6.7.5 */ 1385 T_NAME { 1386 $$ = old_style_function_name(getsym($1)); 1387 } 1388 | identifier_list T_COMMA T_NAME { 1389 $$ = lnklst($1, old_style_function_name(getsym($3))); 1390 } 1391 | identifier_list error 1392 ; 1393 1394 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1395 type_name: /* C99 6.7.6 */ 1396 { 1397 begin_declaration_level(DK_ABSTRACT); 1398 } abstract_declaration { 1399 end_declaration_level(); 1400 $$ = $2->s_type; 1401 } 1402 ; 1403 1404 abstract_declaration: /* specific to lint */ 1405 begin_type_qualifier_list end_type { 1406 $$ = declare_1_abstract(abstract_name()); 1407 } 1408 | begin_type_specifier_qualifier_list end_type { 1409 $$ = declare_1_abstract(abstract_name()); 1410 } 1411 | begin_type_qualifier_list end_type abstract_declarator { 1412 $$ = declare_1_abstract($3); 1413 } 1414 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1415 $$ = declare_1_abstract($3); 1416 } 1417 ; 1418 1419 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1420 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1421 abstract_declarator: 1422 pointer { 1423 $$ = add_pointer(abstract_name(), $1); 1424 } 1425 | direct_abstract_declarator 1426 | pointer direct_abstract_declarator { 1427 $$ = add_pointer($2, $1); 1428 } 1429 | type_attribute_list direct_abstract_declarator { 1430 $$ = $2; 1431 } 1432 | pointer type_attribute_list direct_abstract_declarator { 1433 $$ = add_pointer($3, $1); 1434 } 1435 ; 1436 1437 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1438 direct_abstract_declarator: 1439 /* TODO: sort rules according to C99 */ 1440 T_LPAREN abstract_declarator T_RPAREN { 1441 $$ = $2; 1442 } 1443 | T_LBRACK array_size_opt T_RBRACK { 1444 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1445 } 1446 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1447 $$ = add_array($1, $3.has_dim, $3.dim); 1448 } 1449 | abstract_decl_param_list asm_or_symbolrename_opt { 1450 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1451 end_declaration_level(); 1452 block_level--; 1453 } 1454 | direct_abstract_declarator abstract_decl_param_list 1455 asm_or_symbolrename_opt { 1456 $$ = add_function(symbolrename($1, $3), $2); 1457 end_declaration_level(); 1458 block_level--; 1459 } 1460 | direct_abstract_declarator type_attribute_list 1461 ; 1462 1463 abstract_decl_param_list: /* specific to lint */ 1464 abstract_decl_lparen T_RPAREN type_attribute_opt { 1465 $$ = NULL; 1466 } 1467 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1468 type_attribute_opt { 1469 dcs->d_proto = true; 1470 $$ = $2; 1471 } 1472 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1473 $$ = NULL; 1474 } 1475 ; 1476 1477 abstract_decl_lparen: /* specific to lint */ 1478 T_LPAREN { 1479 block_level++; 1480 begin_declaration_level(DK_PROTO_ARG); 1481 } 1482 ; 1483 1484 vararg_parameter_type_list: /* specific to lint */ 1485 parameter_type_list 1486 | parameter_type_list T_COMMA T_ELLIPSIS { 1487 dcs->d_vararg = true; 1488 $$ = $1; 1489 } 1490 | T_ELLIPSIS { 1491 /* TODO: C99 6.7.5 makes this an error as well. */ 1492 if (!allow_trad && !allow_c99) { 1493 /* ANSI C requires formal parameter before '...' */ 1494 error(84); 1495 } else if (allow_c90) { 1496 /* ANSI C requires formal parameter before '...' */ 1497 warning(84); 1498 } 1499 dcs->d_vararg = true; 1500 $$ = NULL; 1501 } 1502 ; 1503 1504 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1505 parameter_type_list: 1506 parameter_declaration 1507 | parameter_type_list T_COMMA parameter_declaration { 1508 $$ = lnklst($1, $3); 1509 } 1510 ; 1511 1512 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1513 parameter_declaration: 1514 begin_type_declmods end_type { 1515 /* ^^ There is no check for the missing type-specifier. */ 1516 $$ = declare_argument(abstract_name(), false); 1517 } 1518 | begin_type_declaration_specifiers end_type { 1519 $$ = declare_argument(abstract_name(), false); 1520 } 1521 | begin_type_declmods end_type notype_param_declarator { 1522 /* ^^ There is no check for the missing type-specifier. */ 1523 $$ = declare_argument($3, false); 1524 } 1525 /* 1526 * type_param_declarator is needed because of following conflict: 1527 * "typedef int a; f(int (a));" could be parsed as 1528 * "function with argument a of type int", or 1529 * "function with an abstract argument of type function". 1530 * This grammar realizes the second case. 1531 */ 1532 | begin_type_declaration_specifiers end_type type_param_declarator { 1533 $$ = declare_argument($3, false); 1534 } 1535 | begin_type_declmods end_type abstract_declarator { 1536 /* ^^ There is no check for the missing type-specifier. */ 1537 $$ = declare_argument($3, false); 1538 } 1539 | begin_type_declaration_specifiers end_type abstract_declarator { 1540 $$ = declare_argument($3, false); 1541 } 1542 ; 1543 1544 initializer: /* C99 6.7.8 "Initialization" */ 1545 assignment_expression { 1546 init_expr($1); 1547 } 1548 | init_lbrace init_rbrace { 1549 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1550 } 1551 | init_lbrace initializer_list comma_opt init_rbrace 1552 /* XXX: What is this error handling for? */ 1553 | error 1554 ; 1555 1556 initializer_list: /* C99 6.7.8 "Initialization" */ 1557 initializer_list_item 1558 | initializer_list T_COMMA initializer_list_item 1559 ; 1560 1561 initializer_list_item: /* helper */ 1562 designation initializer 1563 | initializer 1564 ; 1565 1566 designation: /* C99 6.7.8 "Initialization" */ 1567 begin_designation designator_list T_ASSIGN 1568 | identifier T_COLON { 1569 /* GCC style struct or union member name in initializer */ 1570 gnuism(315); 1571 begin_designation(); 1572 add_designator_member($1); 1573 } 1574 ; 1575 1576 begin_designation: /* lint-specific helper */ 1577 /* empty */ { 1578 begin_designation(); 1579 } 1580 ; 1581 1582 designator_list: /* C99 6.7.8 "Initialization" */ 1583 designator 1584 | designator_list designator 1585 ; 1586 1587 designator: /* C99 6.7.8 "Initialization" */ 1588 T_LBRACK range T_RBRACK { 1589 if (!allow_c99) 1590 /* array initializer with designators is a C99 ... */ 1591 warning(321); 1592 add_designator_subscript($2); 1593 } 1594 | T_POINT identifier { 1595 if (!allow_c99) 1596 /* struct or union member name in initializer is ... */ 1597 warning(313); 1598 add_designator_member($2); 1599 } 1600 ; 1601 1602 static_assert_declaration: 1603 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1604 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1605 ; 1606 1607 range: 1608 constant_expr { 1609 $$.lo = to_int_constant($1, true); 1610 $$.hi = $$.lo; 1611 } 1612 | constant_expr T_ELLIPSIS constant_expr { 1613 $$.lo = to_int_constant($1, true); 1614 $$.hi = to_int_constant($3, true); 1615 /* initialization with '[a...b]' is a GCC extension */ 1616 gnuism(340); 1617 } 1618 ; 1619 1620 init_lbrace: /* helper */ 1621 T_LBRACE { 1622 init_lbrace(); 1623 } 1624 ; 1625 1626 init_rbrace: /* helper */ 1627 T_RBRACE { 1628 init_rbrace(); 1629 } 1630 ; 1631 1632 asm_or_symbolrename_opt: /* GCC extensions */ 1633 /* empty */ { 1634 $$ = NULL; 1635 } 1636 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1637 freeyyv(&$3, T_STRING); 1638 $$ = NULL; 1639 } 1640 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1641 $$ = $3; 1642 } 1643 ; 1644 1645 statement: /* C99 6.8 */ 1646 expression_statement 1647 | non_expr_statement 1648 ; 1649 1650 non_expr_statement: /* helper for C99 6.8 */ 1651 gcc_attribute /* ((__fallthrough__)) */ T_SEMI 1652 | labeled_statement 1653 | compound_statement 1654 | selection_statement 1655 | iteration_statement 1656 | jump_statement { 1657 seen_fallthrough = false; 1658 } 1659 | asm_statement 1660 ; 1661 1662 labeled_statement: /* C99 6.8.1 */ 1663 label gcc_attribute_list_opt statement 1664 ; 1665 1666 label: 1667 T_NAME T_COLON { 1668 symtyp = FLABEL; 1669 named_label(getsym($1)); 1670 } 1671 | T_CASE constant_expr T_COLON { 1672 case_label($2); 1673 seen_fallthrough = true; 1674 } 1675 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1676 /* XXX: We don't fill all cases */ 1677 case_label($2); 1678 seen_fallthrough = true; 1679 } 1680 | T_DEFAULT T_COLON { 1681 default_label(); 1682 seen_fallthrough = true; 1683 } 1684 ; 1685 1686 compound_statement: /* C99 6.8.2 */ 1687 compound_statement_lbrace compound_statement_rbrace 1688 | compound_statement_lbrace block_item_list compound_statement_rbrace 1689 ; 1690 1691 compound_statement_lbrace: 1692 T_LBRACE { 1693 block_level++; 1694 mem_block_level++; 1695 begin_declaration_level(DK_AUTO); 1696 } 1697 ; 1698 1699 compound_statement_rbrace: 1700 T_RBRACE { 1701 end_declaration_level(); 1702 level_free_all(mem_block_level); 1703 mem_block_level--; 1704 block_level--; 1705 seen_fallthrough = false; 1706 } 1707 ; 1708 1709 block_item_list: /* C99 6.8.2 */ 1710 block_item 1711 | block_item_list block_item { 1712 if ($1 && !$2) 1713 /* declarations after statements is a C99 feature */ 1714 c99ism(327); 1715 $$ = $1 || $2; 1716 } 1717 ; 1718 1719 block_item: /* C99 6.8.2 */ 1720 declaration_or_error { 1721 $$ = false; 1722 restore_warning_flags(); 1723 } 1724 | statement { 1725 $$ = true; 1726 restore_warning_flags(); 1727 } 1728 ; 1729 1730 expression_statement: /* C99 6.8.3 */ 1731 expression T_SEMI { 1732 expr($1, false, false, false, false); 1733 seen_fallthrough = false; 1734 } 1735 | T_SEMI { 1736 check_statement_reachable(); 1737 seen_fallthrough = false; 1738 } 1739 ; 1740 1741 selection_statement: /* C99 6.8.4 */ 1742 if_without_else %prec T_THEN { 1743 save_warning_flags(); 1744 if2(); 1745 if3(false); 1746 } 1747 | if_without_else T_ELSE { 1748 save_warning_flags(); 1749 if2(); 1750 } statement { 1751 clear_warning_flags(); 1752 if3(true); 1753 } 1754 | if_without_else T_ELSE error { 1755 clear_warning_flags(); 1756 if3(false); 1757 } 1758 | switch_expr statement { 1759 clear_warning_flags(); 1760 switch2(); 1761 } 1762 | switch_expr error { 1763 clear_warning_flags(); 1764 switch2(); 1765 } 1766 ; 1767 1768 if_without_else: /* see C99 6.8.4 */ 1769 if_expr statement 1770 | if_expr error 1771 ; 1772 1773 if_expr: /* see C99 6.8.4 */ 1774 T_IF T_LPAREN expression T_RPAREN { 1775 if1($3); 1776 clear_warning_flags(); 1777 } 1778 ; 1779 1780 switch_expr: /* see C99 6.8.4 */ 1781 T_SWITCH T_LPAREN expression T_RPAREN { 1782 switch1($3); 1783 clear_warning_flags(); 1784 } 1785 ; 1786 1787 iteration_statement: /* C99 6.8.5 */ 1788 while_expr statement { 1789 clear_warning_flags(); 1790 while2(); 1791 } 1792 | while_expr error { 1793 clear_warning_flags(); 1794 while2(); 1795 } 1796 | do_statement do_while_expr { 1797 do2($2); 1798 seen_fallthrough = false; 1799 } 1800 | do error { 1801 clear_warning_flags(); 1802 do2(NULL); 1803 } 1804 | for_exprs statement { 1805 clear_warning_flags(); 1806 for2(); 1807 end_declaration_level(); 1808 block_level--; 1809 } 1810 | for_exprs error { 1811 clear_warning_flags(); 1812 for2(); 1813 end_declaration_level(); 1814 block_level--; 1815 } 1816 ; 1817 1818 while_expr: /* see C99 6.8.5 */ 1819 T_WHILE T_LPAREN expression T_RPAREN { 1820 while1($3); 1821 clear_warning_flags(); 1822 } 1823 ; 1824 1825 do_statement: /* see C99 6.8.5 */ 1826 do statement { 1827 clear_warning_flags(); 1828 } 1829 ; 1830 1831 do: /* see C99 6.8.5 */ 1832 T_DO { 1833 do1(); 1834 } 1835 ; 1836 1837 do_while_expr: /* see C99 6.8.5 */ 1838 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1839 $$ = $3; 1840 } 1841 ; 1842 1843 for_start: /* see C99 6.8.5 */ 1844 T_FOR T_LPAREN { 1845 begin_declaration_level(DK_AUTO); 1846 block_level++; 1847 } 1848 ; 1849 1850 for_exprs: /* see C99 6.8.5 */ 1851 for_start 1852 begin_type_declaration_specifiers end_type 1853 notype_init_declarators T_SEMI 1854 expression_opt T_SEMI 1855 expression_opt T_RPAREN { 1856 /* variable declaration in for loop */ 1857 c99ism(325); 1858 for1(NULL, $6, $8); 1859 clear_warning_flags(); 1860 } 1861 | for_start 1862 expression_opt T_SEMI 1863 expression_opt T_SEMI 1864 expression_opt T_RPAREN { 1865 for1($2, $4, $6); 1866 clear_warning_flags(); 1867 } 1868 ; 1869 1870 jump_statement: /* C99 6.8.6 */ 1871 goto identifier T_SEMI { 1872 do_goto(getsym($2)); 1873 } 1874 | goto error T_SEMI { 1875 symtyp = FVFT; 1876 } 1877 | T_CONTINUE T_SEMI { 1878 do_continue(); 1879 } 1880 | T_BREAK T_SEMI { 1881 do_break(); 1882 } 1883 | T_RETURN sys T_SEMI { 1884 do_return($2, NULL); 1885 } 1886 | T_RETURN sys expression T_SEMI { 1887 do_return($2, $3); 1888 } 1889 ; 1890 1891 goto: /* see C99 6.8.6 */ 1892 T_GOTO { 1893 symtyp = FLABEL; 1894 } 1895 ; 1896 1897 asm_statement: /* GCC extension */ 1898 T_ASM T_LPAREN read_until_rparen T_SEMI { 1899 setasm(); 1900 } 1901 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1902 setasm(); 1903 } 1904 | T_ASM error 1905 ; 1906 1907 read_until_rparen: /* helper for 'asm_statement' */ 1908 /* empty */ { 1909 read_until_rparen(); 1910 } 1911 ; 1912 1913 translation_unit: /* C99 6.9 */ 1914 external_declaration 1915 | translation_unit external_declaration 1916 ; 1917 1918 external_declaration: /* C99 6.9 */ 1919 function_definition { 1920 global_clean_up_decl(false); 1921 clear_warning_flags(); 1922 } 1923 | top_level_declaration { 1924 global_clean_up_decl(false); 1925 clear_warning_flags(); 1926 } 1927 | asm_statement /* GCC extension */ 1928 | T_SEMI { /* GCC extension */ 1929 /* 1930 * TODO: Only allow this in GCC mode, not in plain C99. 1931 * This is one of the top 10 warnings in the NetBSD build. 1932 */ 1933 if (!allow_trad && !allow_c99) { 1934 /* empty declaration */ 1935 error(0); 1936 } else if (allow_c90) { 1937 /* empty declaration */ 1938 warning(0); 1939 } 1940 } 1941 ; 1942 1943 /* 1944 * On the top level, lint allows several forms of declarations that it doesn't 1945 * allow in functions. For example, a single ';' is an empty declaration and 1946 * is supported by some compilers, but in a function it would be an empty 1947 * statement, not a declaration. This makes a difference in C90 mode, where 1948 * a statement must not be followed by a declaration. 1949 * 1950 * See 'declaration' for all other declarations. 1951 */ 1952 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1953 begin_type end_type notype_init_declarators T_SEMI { 1954 /* TODO: Make this an error in C99 mode as well. */ 1955 if (!allow_trad && !allow_c99) { 1956 /* old style declaration; add 'int' */ 1957 error(1); 1958 } else if (allow_c90) { 1959 /* old style declaration; add 'int' */ 1960 warning(1); 1961 } 1962 } 1963 | declaration 1964 | error T_SEMI { 1965 global_clean_up(); 1966 } 1967 | error T_RBRACE { 1968 global_clean_up(); 1969 } 1970 ; 1971 1972 function_definition: /* C99 6.9.1 */ 1973 func_declarator { 1974 if ($1->s_type->t_tspec != FUNC) { 1975 /* syntax error '%s' */ 1976 error(249, yytext); 1977 YYERROR; 1978 } 1979 if ($1->s_type->t_typedef) { 1980 /* ()-less function definition */ 1981 error(64); 1982 YYERROR; 1983 } 1984 funcdef($1); 1985 block_level++; 1986 begin_declaration_level(DK_OLD_STYLE_ARG); 1987 if (lwarn == LWARN_NONE) 1988 $1->s_used = true; 1989 } arg_declaration_list_opt { 1990 end_declaration_level(); 1991 block_level--; 1992 check_func_lint_directives(); 1993 check_func_old_style_arguments(); 1994 begin_control_statement(CS_FUNCTION_BODY); 1995 } compound_statement { 1996 funcend(); 1997 end_control_statement(CS_FUNCTION_BODY); 1998 } 1999 ; 2000 2001 func_declarator: 2002 begin_type end_type notype_declarator { 2003 if (!allow_trad) { 2004 /* old style declaration; add 'int' */ 2005 error(1); 2006 } 2007 $$ = $3; 2008 } 2009 | begin_type_declmods end_type notype_declarator { 2010 if (!allow_trad) { 2011 /* old style declaration; add 'int' */ 2012 error(1); 2013 } 2014 $$ = $3; 2015 } 2016 | begin_type_declaration_specifiers end_type type_declarator { 2017 $$ = $3; 2018 } 2019 ; 2020 2021 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2022 /* empty */ 2023 | arg_declaration_list 2024 ; 2025 2026 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2027 arg_declaration 2028 | arg_declaration_list arg_declaration 2029 /* XXX or better "arg_declaration error" ? */ 2030 | error 2031 ; 2032 2033 /* 2034 * "arg_declaration" is separated from "declaration" because it 2035 * needs other error handling. 2036 */ 2037 arg_declaration: 2038 begin_type_declmods end_type T_SEMI { 2039 /* empty declaration */ 2040 warning(2); 2041 } 2042 | begin_type_declmods end_type notype_init_declarators T_SEMI 2043 | begin_type_declaration_specifiers end_type T_SEMI { 2044 if (!dcs->d_nonempty_decl) { 2045 /* empty declaration */ 2046 warning(2); 2047 } else { 2048 /* '%s' declared in argument declaration list */ 2049 warning(3, type_name(dcs->d_type)); 2050 } 2051 } 2052 | begin_type_declaration_specifiers end_type 2053 type_init_declarators T_SEMI { 2054 if (dcs->d_nonempty_decl) { 2055 /* '%s' declared in argument declaration list */ 2056 warning(3, type_name(dcs->d_type)); 2057 } 2058 } 2059 | begin_type_declmods error 2060 | begin_type_declaration_specifiers error 2061 ; 2062 2063 gcc_attribute_list_opt: 2064 /* empty */ 2065 | gcc_attribute_list 2066 ; 2067 2068 gcc_attribute_list: 2069 gcc_attribute 2070 | gcc_attribute_list gcc_attribute 2071 ; 2072 2073 gcc_attribute: 2074 T_ATTRIBUTE T_LPAREN T_LPAREN { 2075 in_gcc_attribute = true; 2076 } gcc_attribute_spec_list { 2077 in_gcc_attribute = false; 2078 } T_RPAREN T_RPAREN 2079 ; 2080 2081 gcc_attribute_spec_list: 2082 gcc_attribute_spec 2083 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2084 ; 2085 2086 gcc_attribute_spec: 2087 /* empty */ 2088 | T_AT_ALWAYS_INLINE 2089 | T_AT_ALIAS T_LPAREN string T_RPAREN 2090 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2091 | T_AT_ALIGNED 2092 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2093 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2094 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2095 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2096 | T_AT_COLD 2097 | T_AT_COMMON 2098 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2099 | T_AT_CONSTRUCTOR 2100 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2101 | T_AT_DEPRECATED 2102 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2103 | T_AT_DESTRUCTOR 2104 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2105 | T_AT_FALLTHROUGH { 2106 fallthru(1); 2107 } 2108 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2109 constant_expr T_COMMA constant_expr T_RPAREN 2110 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2111 | T_AT_GNU_INLINE 2112 | T_AT_HOT 2113 | T_AT_MALLOC 2114 | T_AT_MAY_ALIAS 2115 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2116 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2117 | T_AT_NO_SANITIZE_THREAD 2118 | T_AT_NOINLINE 2119 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2120 | T_AT_NONNULL 2121 | T_AT_NONSTRING 2122 | T_AT_NORETURN 2123 | T_AT_NOTHROW 2124 | T_AT_NO_INSTRUMENT_FUNCTION 2125 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2126 | T_AT_OPTNONE 2127 | T_AT_PACKED { 2128 addpacked(); 2129 } 2130 | T_AT_PCS T_LPAREN string T_RPAREN 2131 | T_AT_PURE 2132 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2133 | T_AT_RETURNS_NONNULL 2134 | T_AT_RETURNS_TWICE 2135 | T_AT_SECTION T_LPAREN string T_RPAREN 2136 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2137 | T_AT_SENTINEL 2138 | T_AT_TARGET T_LPAREN string T_RPAREN 2139 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2140 | T_AT_TUNION 2141 | T_AT_UNUSED { 2142 add_attr_used(); 2143 } 2144 | T_AT_USED { 2145 add_attr_used(); 2146 } 2147 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2148 | T_AT_WARN_UNUSED_RESULT 2149 | T_AT_WEAK 2150 | T_QUAL { 2151 if ($1 != CONST) 2152 yyerror("Bad attribute"); 2153 } 2154 ; 2155 2156 gcc_attribute_bounded: 2157 T_AT_MINBYTES 2158 | T_AT_STRING 2159 | T_AT_BUFFER 2160 ; 2161 2162 gcc_attribute_format: 2163 T_AT_FORMAT_GNU_PRINTF 2164 | T_AT_FORMAT_PRINTF 2165 | T_AT_FORMAT_SCANF 2166 | T_AT_FORMAT_STRFMON 2167 | T_AT_FORMAT_STRFTIME 2168 | T_AT_FORMAT_SYSLOG 2169 ; 2170 2171 sys: 2172 /* empty */ { 2173 $$ = in_system_header; 2174 } 2175 ; 2176 2177 %% 2178 2179 /* ARGSUSED */ 2180 int 2181 yyerror(const char *msg) 2182 { 2183 /* syntax error '%s' */ 2184 error(249, yytext); 2185 if (++sytxerr >= 5) 2186 norecover(); 2187 return 0; 2188 } 2189 2190 #if YYDEBUG && (YYBYACC || YYBISON) 2191 static const char * 2192 cgram_to_string(int token, YYSTYPE val) 2193 { 2194 2195 switch (token) { 2196 case T_INCDEC: 2197 case T_MULTIPLICATIVE: 2198 case T_ADDITIVE: 2199 case T_SHIFT: 2200 case T_RELATIONAL: 2201 case T_EQUALITY: 2202 case T_OPASSIGN: 2203 return modtab[val.y_op].m_name; 2204 case T_SCLASS: 2205 return scl_name(val.y_scl); 2206 case T_TYPE: 2207 case T_STRUCT_OR_UNION: 2208 return tspec_name(val.y_tspec); 2209 case T_QUAL: 2210 return tqual_name(val.y_tqual); 2211 case T_NAME: 2212 return val.y_name->sb_name; 2213 default: 2214 return "<none>"; 2215 } 2216 } 2217 #endif 2218 2219 #if YYDEBUG && YYBISON 2220 static inline void 2221 cgram_print(FILE *output, int token, YYSTYPE val) 2222 { 2223 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2224 } 2225 #endif 2226 2227 static void 2228 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2229 { 2230 declare(decl, initflg, renaming); 2231 if (renaming != NULL) 2232 freeyyv(&renaming, T_NAME); 2233 } 2234 2235 /* 2236 * Discard all input tokens up to and including the next 2237 * unmatched right paren 2238 */ 2239 static void 2240 read_until_rparen(void) 2241 { 2242 int level; 2243 2244 if (yychar < 0) 2245 yychar = yylex(); 2246 freeyyv(&yylval, yychar); 2247 2248 level = 1; 2249 while (yychar != T_RPAREN || --level > 0) { 2250 if (yychar == T_LPAREN) { 2251 level++; 2252 } else if (yychar <= 0) { 2253 break; 2254 } 2255 freeyyv(&yylval, yychar = yylex()); 2256 } 2257 2258 yyclearin; 2259 } 2260 2261 static sym_t * 2262 symbolrename(sym_t *s, sbuf_t *sb) 2263 { 2264 if (sb != NULL) 2265 s->s_rename = sb->sb_name; 2266 return s; 2267 } 2268
Indexes created Sat Oct 11 19:10:01 GMT 2025