cgram.y revision 1.398
1 %{ 2 /* $NetBSD: cgram.y,v 1.398 2022/04/24 16:50:06 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 1.398 2022/04/24 16:50:06 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 defined(YYDEBUG) && (defined(YYBYACC) || defined(YYBISON)) 121 #define YYSTYPE_TOSTRING cgram_to_string 122 #endif 123 #if defined(YYDEBUG) && defined(YYBISON) 124 #define YYPRINT cgram_print 125 #endif 126 127 %} 128 129 %expect 138 130 131 %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 defined(YYDEBUG) && defined(YYBISON) 367 static inline void cgram_print(FILE *, int, YYSTYPE); 368 #endif 369 %} 370 371 %% 372 373 program: 374 /* empty */ { 375 if (sflag) { 376 /* empty translation unit */ 377 error(272); 378 } else if (!tflag) { 379 /* empty translation unit */ 380 warning(272); 381 } 382 } 383 | translation_unit 384 ; 385 386 identifier_sym: /* helper for struct/union/enum */ 387 identifier { 388 $$ = getsym($1); 389 } 390 ; 391 392 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 393 identifier: 394 T_NAME { 395 debug_step("cgram: name '%s'", $1->sb_name); 396 $$ = $1; 397 } 398 | T_TYPENAME { 399 debug_step("cgram: typename '%s'", $1->sb_name); 400 $$ = $1; 401 } 402 ; 403 404 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 405 string: 406 T_STRING 407 | string T_STRING { 408 if (tflag) { 409 /* concatenated strings are illegal in traditional C */ 410 warning(219); 411 } 412 $$ = cat_strings($1, $2); 413 } 414 ; 415 416 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 417 primary_expression: 418 T_NAME { 419 bool sys_name, sys_next; 420 sys_name = in_system_header; 421 if (yychar < 0) 422 yychar = yylex(); 423 sys_next = in_system_header; 424 in_system_header = sys_name; 425 $$ = build_name(getsym($1), yychar == T_LPAREN); 426 in_system_header = sys_next; 427 } 428 | T_CON { 429 $$ = build_constant(gettyp($1->v_tspec), $1); 430 } 431 | string { 432 $$ = build_string($1); 433 } 434 | T_LPAREN expression T_RPAREN { 435 if ($2 != NULL) 436 $2->tn_parenthesized = true; 437 $$ = $2; 438 } 439 | generic_selection 440 /* GCC primary-expression, see c_parser_postfix_expression */ 441 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 442 symtyp = FMEMBER; 443 $$ = build_offsetof($3, getsym($5)); 444 } 445 ; 446 447 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 448 generic_selection: 449 T_GENERIC T_LPAREN assignment_expression T_COMMA 450 generic_assoc_list T_RPAREN { 451 /* generic selection requires C11 or later */ 452 c11ism(345); 453 $$ = build_generic_selection($3, $5); 454 } 455 ; 456 457 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 458 generic_assoc_list: 459 generic_association 460 | generic_assoc_list T_COMMA generic_association { 461 $3->ga_prev = $1; 462 $$ = $3; 463 } 464 ; 465 466 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 467 generic_association: 468 type_name T_COLON assignment_expression { 469 $$ = block_zero_alloc(sizeof(*$$)); 470 $$->ga_arg = $1; 471 $$->ga_result = $3; 472 } 473 | T_DEFAULT T_COLON assignment_expression { 474 $$ = block_zero_alloc(sizeof(*$$)); 475 $$->ga_arg = NULL; 476 $$->ga_result = $3; 477 } 478 ; 479 480 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 481 postfix_expression: 482 primary_expression 483 | postfix_expression T_LBRACK sys expression T_RBRACK { 484 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 485 } 486 | postfix_expression T_LPAREN sys T_RPAREN { 487 $$ = build_function_call($1, $3, NULL); 488 } 489 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 490 $$ = build_function_call($1, $3, $4); 491 } 492 | postfix_expression point_or_arrow sys T_NAME { 493 $$ = build_member_access($1, $2, $3, $4); 494 } 495 | postfix_expression T_INCDEC sys { 496 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 497 } 498 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 499 sym_t *tmp = mktempsym($2); 500 begin_initialization(tmp); 501 cgram_declare(tmp, true, NULL); 502 } init_lbrace initializer_list comma_opt init_rbrace { 503 if (!Sflag) 504 /* compound literals are a C99/GCC extension */ 505 gnuism(319); 506 $$ = build_name(*current_initsym(), false); 507 end_initialization(); 508 } 509 | T_LPAREN compound_statement_lbrace { 510 begin_statement_expr(); 511 } gcc_statement_expr_list { 512 do_statement_expr($4); 513 } compound_statement_rbrace T_RPAREN { 514 $$ = end_statement_expr(); 515 } 516 ; 517 518 comma_opt: /* helper for 'postfix_expression' */ 519 /* empty */ 520 | T_COMMA 521 ; 522 523 /* 524 * The inner part of a GCC statement-expression of the form ({ ... }). 525 * 526 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 527 */ 528 gcc_statement_expr_list: 529 gcc_statement_expr_item 530 | gcc_statement_expr_list gcc_statement_expr_item { 531 $$ = $2; 532 } 533 ; 534 535 gcc_statement_expr_item: 536 declaration_or_error { 537 clear_warning_flags(); 538 $$ = NULL; 539 } 540 | non_expr_statement { 541 $$ = expr_alloc_tnode(); 542 $$->tn_type = gettyp(VOID); 543 } 544 | expression T_SEMI { 545 if ($1 == NULL) { /* in case of syntax errors */ 546 $$ = expr_alloc_tnode(); 547 $$->tn_type = gettyp(VOID); 548 } else { 549 /* XXX: do that only on the last name */ 550 if ($1->tn_op == NAME) 551 $1->tn_sym->s_used = true; 552 expr($1, false, false, false, false); 553 seen_fallthrough = false; 554 $$ = $1; 555 } 556 } 557 ; 558 559 point_or_arrow: /* helper for 'postfix_expression' */ 560 T_POINT { 561 symtyp = FMEMBER; 562 $$ = POINT; 563 } 564 | T_ARROW { 565 symtyp = FMEMBER; 566 $$ = ARROW; 567 } 568 ; 569 570 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 571 argument_expression_list: 572 assignment_expression { 573 $$ = build_function_argument(NULL, $1); 574 } 575 | argument_expression_list T_COMMA assignment_expression { 576 $$ = build_function_argument($1, $3); 577 } 578 ; 579 580 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 581 unary_expression: 582 postfix_expression 583 | T_INCDEC sys unary_expression { 584 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 585 } 586 | T_AMPER sys cast_expression { 587 $$ = build_unary(ADDR, $2, $3); 588 } 589 | T_ASTERISK sys cast_expression { 590 $$ = build_unary(INDIR, $2, $3); 591 } 592 | T_ADDITIVE sys cast_expression { 593 if (tflag && $1 == PLUS) { 594 /* unary + is illegal in traditional C */ 595 warning(100); 596 } 597 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 598 } 599 | T_COMPLEMENT sys cast_expression { 600 $$ = build_unary(COMPL, $2, $3); 601 } 602 | T_LOGNOT sys cast_expression { 603 $$ = build_unary(NOT, $2, $3); 604 } 605 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 606 $$ = build_unary(REAL, $2, $3); 607 } 608 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 609 $$ = build_unary(IMAG, $2, $3); 610 } 611 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 612 $$ = $2; 613 } 614 | T_SIZEOF unary_expression { 615 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 616 if ($$ != NULL) 617 check_expr_misc($2, 618 false, false, false, false, false, true); 619 } 620 | T_SIZEOF T_LPAREN type_name T_RPAREN { 621 $$ = build_sizeof($3); 622 } 623 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 624 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 625 /* TODO: c11ism */ 626 $$ = build_alignof($3); 627 } 628 ; 629 630 /* The rule 'unary_operator' is inlined into unary_expression. */ 631 632 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 633 cast_expression: 634 unary_expression 635 | T_LPAREN type_name T_RPAREN cast_expression { 636 $$ = cast($4, $2); 637 } 638 ; 639 640 expression_opt: 641 /* empty */ { 642 $$ = NULL; 643 } 644 | expression 645 ; 646 647 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 648 /* 'conditional_expression' also implements 'additive_expression'. */ 649 /* 'conditional_expression' also implements 'shift_expression'. */ 650 /* 'conditional_expression' also implements 'relational_expression'. */ 651 /* 'conditional_expression' also implements 'equality_expression'. */ 652 /* 'conditional_expression' also implements 'AND_expression'. */ 653 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 654 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 655 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 656 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 657 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 658 conditional_expression: 659 cast_expression 660 | conditional_expression T_ASTERISK sys conditional_expression { 661 $$ = build_binary($1, MULT, $3, $4); 662 } 663 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 664 $$ = build_binary($1, $2, $3, $4); 665 } 666 | conditional_expression T_ADDITIVE sys conditional_expression { 667 $$ = build_binary($1, $2, $3, $4); 668 } 669 | conditional_expression T_SHIFT sys conditional_expression { 670 $$ = build_binary($1, $2, $3, $4); 671 } 672 | conditional_expression T_RELATIONAL sys conditional_expression { 673 $$ = build_binary($1, $2, $3, $4); 674 } 675 | conditional_expression T_EQUALITY sys conditional_expression { 676 $$ = build_binary($1, $2, $3, $4); 677 } 678 | conditional_expression T_AMPER sys conditional_expression { 679 $$ = build_binary($1, BITAND, $3, $4); 680 } 681 | conditional_expression T_BITXOR sys conditional_expression { 682 $$ = build_binary($1, BITXOR, $3, $4); 683 } 684 | conditional_expression T_BITOR sys conditional_expression { 685 $$ = build_binary($1, BITOR, $3, $4); 686 } 687 | conditional_expression T_LOGAND sys conditional_expression { 688 $$ = build_binary($1, LOGAND, $3, $4); 689 } 690 | conditional_expression T_LOGOR sys conditional_expression { 691 $$ = build_binary($1, LOGOR, $3, $4); 692 } 693 | conditional_expression T_QUEST sys 694 expression T_COLON sys conditional_expression { 695 $$ = build_binary($1, QUEST, $3, 696 build_binary($4, COLON, $6, $7)); 697 } 698 ; 699 700 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 701 assignment_expression: 702 conditional_expression 703 | unary_expression T_ASSIGN sys assignment_expression { 704 $$ = build_binary($1, ASSIGN, $3, $4); 705 } 706 | unary_expression T_OPASSIGN sys assignment_expression { 707 $$ = build_binary($1, $2, $3, $4); 708 } 709 ; 710 711 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 712 expression: 713 assignment_expression 714 | expression T_COMMA sys assignment_expression { 715 $$ = build_binary($1, COMMA, $3, $4); 716 } 717 ; 718 719 constant_expr_list_opt: /* helper for gcc_attribute */ 720 /* empty */ 721 | constant_expr_list 722 ; 723 724 constant_expr_list: /* helper for gcc_attribute */ 725 constant_expr 726 | constant_expr_list T_COMMA constant_expr 727 ; 728 729 constant_expr: /* C99 6.6 */ 730 conditional_expression 731 ; 732 733 declaration_or_error: 734 declaration 735 | error T_SEMI 736 ; 737 738 declaration: /* C99 6.7 */ 739 begin_type_declmods end_type T_SEMI { 740 if (dcs->d_scl == TYPEDEF) { 741 /* typedef declares no type name */ 742 warning(72); 743 } else { 744 /* empty declaration */ 745 warning(2); 746 } 747 } 748 | begin_type_declmods end_type notype_init_declarators T_SEMI 749 /* ^^ There is no check for the missing type-specifier. */ 750 | begin_type_declaration_specifiers end_type T_SEMI { 751 if (dcs->d_scl == TYPEDEF) { 752 /* typedef declares no type name */ 753 warning(72); 754 } else if (!dcs->d_nonempty_decl) { 755 /* empty declaration */ 756 warning(2); 757 } 758 } 759 | begin_type_declaration_specifiers end_type 760 type_init_declarators T_SEMI 761 | static_assert_declaration 762 ; 763 764 begin_type_declaration_specifiers: /* see C99 6.7 */ 765 begin_type_typespec { 766 add_type($1); 767 } 768 | begin_type_declmods type_specifier { 769 add_type($2); 770 } 771 | type_attribute begin_type_declaration_specifiers 772 | begin_type_declaration_specifiers declmod 773 | begin_type_declaration_specifiers notype_type_specifier { 774 add_type($2); 775 } 776 ; 777 778 begin_type_declmods: /* see C99 6.7 */ 779 begin_type T_QUAL { 780 add_qualifier($2); 781 } 782 | begin_type T_SCLASS { 783 add_storage_class($2); 784 } 785 | begin_type_declmods declmod 786 ; 787 788 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 789 begin_type_specifier_qualifier_list_postfix 790 | type_attribute_list begin_type_specifier_qualifier_list_postfix 791 ; 792 793 begin_type_specifier_qualifier_list_postfix: 794 begin_type_typespec { 795 add_type($1); 796 } 797 | begin_type_qualifier_list type_specifier { 798 add_type($2); 799 } 800 | begin_type_specifier_qualifier_list_postfix T_QUAL { 801 add_qualifier($2); 802 } 803 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 804 add_type($2); 805 } 806 | begin_type_specifier_qualifier_list_postfix type_attribute 807 ; 808 809 begin_type_typespec: 810 begin_type notype_type_specifier { 811 $$ = $2; 812 } 813 | T_TYPENAME begin_type { 814 $$ = getsym($1)->s_type; 815 } 816 ; 817 818 begin_type_qualifier_list: 819 begin_type T_QUAL { 820 add_qualifier($2); 821 } 822 | begin_type_qualifier_list T_QUAL { 823 add_qualifier($2); 824 } 825 ; 826 827 declmod: 828 T_QUAL { 829 add_qualifier($1); 830 } 831 | T_SCLASS { 832 add_storage_class($1); 833 } 834 | type_attribute_list 835 ; 836 837 type_attribute_list_opt: 838 /* empty */ 839 | type_attribute_list 840 ; 841 842 type_attribute_list: 843 type_attribute 844 | type_attribute_list type_attribute 845 ; 846 847 type_attribute_opt: 848 /* empty */ 849 | type_attribute 850 ; 851 852 type_attribute: /* See C11 6.7 declaration-specifiers */ 853 gcc_attribute 854 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 855 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 856 | T_PACKED { 857 addpacked(); 858 } 859 | T_NORETURN 860 ; 861 862 begin_type: 863 /* empty */ { 864 begin_type(); 865 } 866 ; 867 868 end_type: 869 /* empty */ { 870 end_type(); 871 } 872 ; 873 874 type_specifier: /* C99 6.7.2 */ 875 notype_type_specifier 876 | T_TYPENAME { 877 $$ = getsym($1)->s_type; 878 } 879 ; 880 881 notype_type_specifier: /* see C99 6.7.2 */ 882 T_TYPE { 883 $$ = gettyp($1); 884 } 885 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 886 $$ = block_dup_type($3->tn_type); 887 $$->t_typeof = true; 888 } 889 | struct_or_union_specifier { 890 end_declaration_level(); 891 $$ = $1; 892 } 893 | enum_specifier { 894 end_declaration_level(); 895 $$ = $1; 896 } 897 ; 898 899 struct_or_union_specifier: /* C99 6.7.2.1 */ 900 struct_or_union identifier_sym { 901 /* 902 * STDC requires that "struct a;" always introduces 903 * a new tag if "a" is not declared at current level 904 * 905 * yychar is valid because otherwise the parser would not 906 * have been able to decide if it must shift or reduce 907 */ 908 $$ = mktag($2, $1, false, yychar == T_SEMI); 909 } 910 | struct_or_union identifier_sym { 911 dcs->d_tagtyp = mktag($2, $1, true, false); 912 } braced_struct_declaration_list { 913 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 914 } 915 | struct_or_union { 916 dcs->d_tagtyp = mktag(NULL, $1, true, false); 917 } braced_struct_declaration_list { 918 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 919 } 920 | struct_or_union error { 921 symtyp = FVFT; 922 $$ = gettyp(INT); 923 } 924 ; 925 926 struct_or_union: /* C99 6.7.2.1 */ 927 T_STRUCT_OR_UNION { 928 symtyp = FTAG; 929 begin_declaration_level($1 == STRUCT ? DK_MOS : DK_MOU); 930 dcs->d_offset_in_bits = 0; 931 dcs->d_sou_align_in_bits = CHAR_SIZE; 932 $$ = $1; 933 } 934 | struct_or_union type_attribute 935 ; 936 937 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 938 struct_declaration_lbrace struct_declaration_list_with_rbrace { 939 $$ = $2; 940 } 941 ; 942 943 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 944 T_LBRACE { 945 symtyp = FVFT; 946 } 947 ; 948 949 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 950 struct_declaration_list T_RBRACE 951 | T_RBRACE { 952 /* XXX: This is not allowed by any C standard. */ 953 $$ = NULL; 954 } 955 ; 956 957 struct_declaration_list: /* C99 6.7.2.1 */ 958 struct_declaration 959 | struct_declaration_list struct_declaration { 960 $$ = lnklst($1, $2); 961 } 962 ; 963 964 struct_declaration: /* C99 6.7.2.1 */ 965 begin_type_qualifier_list end_type { 966 /* ^^ There is no check for the missing type-specifier. */ 967 /* too late, i know, but getsym() compensates it */ 968 symtyp = FMEMBER; 969 } notype_struct_declarators type_attribute_opt T_SEMI { 970 symtyp = FVFT; 971 $$ = $4; 972 } 973 | begin_type_specifier_qualifier_list end_type { 974 symtyp = FMEMBER; 975 } type_struct_declarators type_attribute_opt T_SEMI { 976 symtyp = FVFT; 977 $$ = $4; 978 } 979 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 980 /* syntax error '%s' */ 981 error(249, "member without type"); 982 $$ = NULL; 983 } 984 | begin_type_specifier_qualifier_list end_type type_attribute_opt 985 T_SEMI { 986 symtyp = FVFT; 987 if (!allow_c11 && !allow_gcc) 988 /* anonymous struct/union members is a C11 feature */ 989 warning(49); 990 if (is_struct_or_union(dcs->d_type->t_tspec)) { 991 $$ = dcs->d_type->t_str->sou_first_member; 992 /* add all the members of the anonymous struct/union */ 993 anonymize($$); 994 } else { 995 /* syntax error '%s' */ 996 error(249, "unnamed member"); 997 $$ = NULL; 998 } 999 } 1000 | static_assert_declaration { 1001 $$ = NULL; 1002 } 1003 | error T_SEMI { 1004 symtyp = FVFT; 1005 $$ = NULL; 1006 } 1007 ; 1008 1009 notype_struct_declarators: 1010 notype_struct_declarator { 1011 $$ = declarator_1_struct_union($1); 1012 } 1013 | notype_struct_declarators { 1014 symtyp = FMEMBER; 1015 } T_COMMA type_struct_declarator { 1016 $$ = lnklst($1, declarator_1_struct_union($4)); 1017 } 1018 ; 1019 1020 type_struct_declarators: 1021 type_struct_declarator { 1022 $$ = declarator_1_struct_union($1); 1023 } 1024 | type_struct_declarators { 1025 symtyp = FMEMBER; 1026 } T_COMMA type_struct_declarator { 1027 $$ = lnklst($1, declarator_1_struct_union($4)); 1028 } 1029 ; 1030 1031 notype_struct_declarator: 1032 notype_declarator 1033 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1034 $$ = bitfield($1, to_int_constant($3, true)); 1035 } 1036 | { 1037 symtyp = FVFT; 1038 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1039 $$ = bitfield(NULL, to_int_constant($3, true)); 1040 } 1041 ; 1042 1043 type_struct_declarator: 1044 type_declarator 1045 | type_declarator T_COLON constant_expr { 1046 $$ = bitfield($1, to_int_constant($3, true)); 1047 } 1048 | { 1049 symtyp = FVFT; 1050 } T_COLON constant_expr { 1051 $$ = bitfield(NULL, to_int_constant($3, true)); 1052 } 1053 ; 1054 1055 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1056 enum_specifier: /* C99 6.7.2.2 */ 1057 enum gcc_attribute_list_opt identifier_sym { 1058 $$ = mktag($3, ENUM, false, false); 1059 } 1060 | enum gcc_attribute_list_opt identifier_sym { 1061 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1062 } enum_declaration /*gcc_attribute_list_opt*/ { 1063 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1064 } 1065 | enum gcc_attribute_list_opt { 1066 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1067 } enum_declaration /*gcc_attribute_list_opt*/ { 1068 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1069 } 1070 | enum error { 1071 symtyp = FVFT; 1072 $$ = gettyp(INT); 1073 } 1074 ; 1075 1076 enum: /* helper for C99 6.7.2.2 */ 1077 T_ENUM { 1078 symtyp = FTAG; 1079 begin_declaration_level(DK_ENUM_CONST); 1080 } 1081 ; 1082 1083 enum_declaration: /* helper for C99 6.7.2.2 */ 1084 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1085 $$ = $2; 1086 } 1087 ; 1088 1089 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1090 T_LBRACE { 1091 symtyp = FVFT; 1092 enumval = 0; 1093 } 1094 ; 1095 1096 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1097 enumerator_list 1098 | enumerator_list T_COMMA { 1099 if (Sflag) { 1100 /* C99 6.7.2.2p1 allows trailing ',' */ 1101 } else if (sflag) { 1102 /* trailing ',' prohibited in enum declaration */ 1103 error(54); 1104 } else { 1105 /* trailing ',' prohibited in enum declaration */ 1106 c99ism(54); 1107 } 1108 $$ = $1; 1109 } 1110 ; 1111 1112 enumerator_list: /* C99 6.7.2.2 */ 1113 enumerator 1114 | enumerator_list T_COMMA enumerator { 1115 $$ = lnklst($1, $3); 1116 } 1117 | error { 1118 $$ = NULL; 1119 } 1120 ; 1121 1122 enumerator: /* C99 6.7.2.2 */ 1123 identifier_sym gcc_attribute_list_opt { 1124 $$ = enumeration_constant($1, enumval, true); 1125 } 1126 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1127 $$ = enumeration_constant($1, to_int_constant($4, true), 1128 false); 1129 } 1130 ; 1131 1132 type_qualifier: /* C99 6.7.3 */ 1133 T_QUAL { 1134 $$ = xcalloc(1, sizeof(*$$)); 1135 if ($1 == CONST) 1136 $$->p_const = true; 1137 if ($1 == VOLATILE) 1138 $$->p_volatile = true; 1139 } 1140 ; 1141 1142 pointer: /* C99 6.7.5 */ 1143 asterisk type_qualifier_list_opt { 1144 $$ = merge_qualified_pointer($1, $2); 1145 } 1146 | asterisk type_qualifier_list_opt pointer { 1147 $$ = merge_qualified_pointer($1, $2); 1148 $$ = merge_qualified_pointer($$, $3); 1149 } 1150 ; 1151 1152 asterisk: /* helper for 'pointer' */ 1153 T_ASTERISK { 1154 $$ = xcalloc(1, sizeof(*$$)); 1155 $$->p_pointer = true; 1156 } 1157 ; 1158 1159 type_qualifier_list_opt: /* see C99 6.7.5 */ 1160 /* empty */ { 1161 $$ = NULL; 1162 } 1163 | type_qualifier_list 1164 ; 1165 1166 type_qualifier_list: /* C99 6.7.5 */ 1167 type_qualifier 1168 | type_qualifier_list type_qualifier { 1169 $$ = merge_qualified_pointer($1, $2); 1170 } 1171 ; 1172 1173 /* 1174 * For an explanation of 'notype' in the following rules, see 1175 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1176 */ 1177 1178 notype_init_declarators: 1179 notype_init_declarator 1180 | notype_init_declarators T_COMMA type_init_declarator 1181 ; 1182 1183 type_init_declarators: 1184 type_init_declarator 1185 | type_init_declarators T_COMMA type_init_declarator 1186 ; 1187 1188 notype_init_declarator: 1189 notype_declarator asm_or_symbolrename_opt { 1190 cgram_declare($1, false, $2); 1191 check_size($1); 1192 } 1193 | notype_declarator asm_or_symbolrename_opt { 1194 begin_initialization($1); 1195 cgram_declare($1, true, $2); 1196 } T_ASSIGN initializer { 1197 check_size($1); 1198 end_initialization(); 1199 } 1200 ; 1201 1202 type_init_declarator: 1203 type_declarator asm_or_symbolrename_opt { 1204 cgram_declare($1, false, $2); 1205 check_size($1); 1206 } 1207 | type_declarator asm_or_symbolrename_opt { 1208 begin_initialization($1); 1209 cgram_declare($1, true, $2); 1210 } T_ASSIGN initializer { 1211 check_size($1); 1212 end_initialization(); 1213 } 1214 ; 1215 1216 notype_declarator: 1217 notype_direct_declarator 1218 | pointer notype_direct_declarator { 1219 $$ = add_pointer($2, $1); 1220 } 1221 ; 1222 1223 type_declarator: 1224 type_direct_declarator 1225 | pointer type_direct_declarator { 1226 $$ = add_pointer($2, $1); 1227 } 1228 ; 1229 1230 notype_direct_declarator: 1231 type_attribute_list_opt T_NAME { 1232 $$ = declarator_name(getsym($2)); 1233 } 1234 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1235 $$ = $3; 1236 } 1237 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1238 $$ = add_array($1, $3.has_dim, $3.dim); 1239 } 1240 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1241 $$ = add_function(symbolrename($1, $3), $2); 1242 end_declaration_level(); 1243 block_level--; 1244 } 1245 | notype_direct_declarator type_attribute 1246 ; 1247 1248 type_direct_declarator: 1249 identifier { 1250 $$ = declarator_name(getsym($1)); 1251 } 1252 | T_LPAREN type_declarator T_RPAREN { 1253 $$ = $2; 1254 } 1255 | type_attribute type_direct_declarator { 1256 $$ = $2; 1257 } 1258 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1259 $$ = add_array($1, $3.has_dim, $3.dim); 1260 } 1261 | type_direct_declarator param_list asm_or_symbolrename_opt { 1262 $$ = add_function(symbolrename($1, $3), $2); 1263 end_declaration_level(); 1264 block_level--; 1265 } 1266 | type_direct_declarator type_attribute 1267 ; 1268 1269 /* 1270 * The two distinct rules type_param_declarator and notype_param_declarator 1271 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1272 * always treated as a typename, not an argument name. For example, after 1273 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1274 * "f(int (double));", not "f(int a);". 1275 */ 1276 type_param_declarator: 1277 direct_param_declarator 1278 | pointer direct_param_declarator { 1279 $$ = add_pointer($2, $1); 1280 } 1281 ; 1282 1283 notype_param_declarator: 1284 direct_notype_param_declarator 1285 | pointer direct_notype_param_declarator { 1286 $$ = add_pointer($2, $1); 1287 } 1288 ; 1289 1290 direct_param_declarator: 1291 identifier type_attribute_list { 1292 $$ = declarator_name(getsym($1)); 1293 } 1294 | identifier { 1295 $$ = declarator_name(getsym($1)); 1296 } 1297 | T_LPAREN notype_param_declarator T_RPAREN { 1298 $$ = $2; 1299 } 1300 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1301 gcc_attribute_list_opt { 1302 $$ = add_array($1, $3.has_dim, $3.dim); 1303 } 1304 | direct_param_declarator param_list asm_or_symbolrename_opt { 1305 $$ = add_function(symbolrename($1, $3), $2); 1306 end_declaration_level(); 1307 block_level--; 1308 } 1309 ; 1310 1311 direct_notype_param_declarator: 1312 identifier { 1313 $$ = declarator_name(getsym($1)); 1314 } 1315 | T_LPAREN notype_param_declarator T_RPAREN { 1316 $$ = $2; 1317 } 1318 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1319 $$ = add_array($1, $3.has_dim, $3.dim); 1320 } 1321 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1322 $$ = add_function(symbolrename($1, $3), $2); 1323 end_declaration_level(); 1324 block_level--; 1325 } 1326 ; 1327 1328 param_list: 1329 id_list_lparen identifier_list T_RPAREN { 1330 $$ = $2; 1331 } 1332 | abstract_decl_param_list 1333 ; 1334 1335 id_list_lparen: 1336 T_LPAREN { 1337 block_level++; 1338 begin_declaration_level(DK_PROTO_ARG); 1339 } 1340 ; 1341 1342 array_size_opt: 1343 /* empty */ { 1344 $$.has_dim = false; 1345 $$.dim = 0; 1346 } 1347 | T_ASTERISK { 1348 /* since C99; variable length array of unspecified size */ 1349 $$.has_dim = false; /* TODO: maybe change to true */ 1350 $$.dim = 0; /* just as a placeholder */ 1351 } 1352 | array_size { 1353 $$.has_dim = true; 1354 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1355 } 1356 ; 1357 1358 array_size: 1359 type_qualifier_list_opt T_SCLASS constant_expr { 1360 /* C11 6.7.6.3p7 */ 1361 if ($2 != STATIC) 1362 yyerror("Bad attribute"); 1363 /* static array size is a C11 extension */ 1364 c11ism(343); 1365 $$ = $3; 1366 } 1367 | T_QUAL { 1368 /* C11 6.7.6.2 */ 1369 if ($1 != RESTRICT) 1370 yyerror("Bad attribute"); 1371 $$ = NULL; 1372 } 1373 | constant_expr 1374 ; 1375 1376 identifier_list: /* C99 6.7.5 */ 1377 T_NAME { 1378 $$ = old_style_function_name(getsym($1)); 1379 } 1380 | identifier_list T_COMMA T_NAME { 1381 $$ = lnklst($1, old_style_function_name(getsym($3))); 1382 } 1383 | identifier_list error 1384 ; 1385 1386 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1387 type_name: /* C99 6.7.6 */ 1388 { 1389 begin_declaration_level(DK_ABSTRACT); 1390 } abstract_declaration { 1391 end_declaration_level(); 1392 $$ = $2->s_type; 1393 } 1394 ; 1395 1396 abstract_declaration: /* specific to lint */ 1397 begin_type_qualifier_list end_type { 1398 $$ = declare_1_abstract(abstract_name()); 1399 } 1400 | begin_type_specifier_qualifier_list end_type { 1401 $$ = declare_1_abstract(abstract_name()); 1402 } 1403 | begin_type_qualifier_list end_type abstract_declarator { 1404 $$ = declare_1_abstract($3); 1405 } 1406 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1407 $$ = declare_1_abstract($3); 1408 } 1409 ; 1410 1411 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1412 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1413 abstract_declarator: 1414 pointer { 1415 $$ = add_pointer(abstract_name(), $1); 1416 } 1417 | direct_abstract_declarator 1418 | pointer direct_abstract_declarator { 1419 $$ = add_pointer($2, $1); 1420 } 1421 | type_attribute_list direct_abstract_declarator { 1422 $$ = $2; 1423 } 1424 | pointer type_attribute_list direct_abstract_declarator { 1425 $$ = add_pointer($3, $1); 1426 } 1427 ; 1428 1429 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1430 direct_abstract_declarator: 1431 /* TODO: sort rules according to C99 */ 1432 T_LPAREN abstract_declarator T_RPAREN { 1433 $$ = $2; 1434 } 1435 | T_LBRACK array_size_opt T_RBRACK { 1436 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1437 } 1438 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1439 $$ = add_array($1, $3.has_dim, $3.dim); 1440 } 1441 | abstract_decl_param_list asm_or_symbolrename_opt { 1442 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1443 end_declaration_level(); 1444 block_level--; 1445 } 1446 | direct_abstract_declarator abstract_decl_param_list 1447 asm_or_symbolrename_opt { 1448 $$ = add_function(symbolrename($1, $3), $2); 1449 end_declaration_level(); 1450 block_level--; 1451 } 1452 | direct_abstract_declarator type_attribute_list 1453 ; 1454 1455 abstract_decl_param_list: /* specific to lint */ 1456 abstract_decl_lparen T_RPAREN type_attribute_opt { 1457 $$ = NULL; 1458 } 1459 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1460 type_attribute_opt { 1461 dcs->d_proto = true; 1462 $$ = $2; 1463 } 1464 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1465 $$ = NULL; 1466 } 1467 ; 1468 1469 abstract_decl_lparen: /* specific to lint */ 1470 T_LPAREN { 1471 block_level++; 1472 begin_declaration_level(DK_PROTO_ARG); 1473 } 1474 ; 1475 1476 vararg_parameter_type_list: /* specific to lint */ 1477 parameter_type_list 1478 | parameter_type_list T_COMMA T_ELLIPSIS { 1479 dcs->d_vararg = true; 1480 $$ = $1; 1481 } 1482 | T_ELLIPSIS { 1483 if (sflag) { 1484 /* ANSI C requires formal parameter before '...' */ 1485 error(84); 1486 } else if (!tflag) { 1487 /* ANSI C requires formal parameter before '...' */ 1488 warning(84); 1489 } 1490 dcs->d_vararg = true; 1491 $$ = NULL; 1492 } 1493 ; 1494 1495 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1496 parameter_type_list: 1497 parameter_declaration 1498 | parameter_type_list T_COMMA parameter_declaration { 1499 $$ = lnklst($1, $3); 1500 } 1501 ; 1502 1503 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1504 parameter_declaration: 1505 begin_type_declmods end_type { 1506 /* ^^ There is no check for the missing type-specifier. */ 1507 $$ = declare_argument(abstract_name(), false); 1508 } 1509 | begin_type_declaration_specifiers end_type { 1510 $$ = declare_argument(abstract_name(), false); 1511 } 1512 | begin_type_declmods end_type notype_param_declarator { 1513 /* ^^ There is no check for the missing type-specifier. */ 1514 $$ = declare_argument($3, false); 1515 } 1516 /* 1517 * type_param_declarator is needed because of following conflict: 1518 * "typedef int a; f(int (a));" could be parsed as 1519 * "function with argument a of type int", or 1520 * "function with an abstract argument of type function". 1521 * This grammar realizes the second case. 1522 */ 1523 | begin_type_declaration_specifiers end_type type_param_declarator { 1524 $$ = declare_argument($3, false); 1525 } 1526 | begin_type_declmods end_type abstract_declarator { 1527 /* ^^ There is no check for the missing type-specifier. */ 1528 $$ = declare_argument($3, false); 1529 } 1530 | begin_type_declaration_specifiers end_type abstract_declarator { 1531 $$ = declare_argument($3, false); 1532 } 1533 ; 1534 1535 initializer: /* C99 6.7.8 "Initialization" */ 1536 assignment_expression { 1537 init_expr($1); 1538 } 1539 | init_lbrace init_rbrace { 1540 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1541 } 1542 | init_lbrace initializer_list comma_opt init_rbrace 1543 /* XXX: What is this error handling for? */ 1544 | error 1545 ; 1546 1547 initializer_list: /* C99 6.7.8 "Initialization" */ 1548 initializer_list_item 1549 | initializer_list T_COMMA initializer_list_item 1550 ; 1551 1552 initializer_list_item: /* helper */ 1553 designation initializer 1554 | initializer 1555 ; 1556 1557 designation: /* C99 6.7.8 "Initialization" */ 1558 begin_designation designator_list T_ASSIGN 1559 | identifier T_COLON { 1560 /* GCC style struct or union member name in initializer */ 1561 gnuism(315); 1562 begin_designation(); 1563 add_designator_member($1); 1564 } 1565 ; 1566 1567 begin_designation: /* lint-specific helper */ 1568 /* empty */ { 1569 begin_designation(); 1570 } 1571 ; 1572 1573 designator_list: /* C99 6.7.8 "Initialization" */ 1574 designator 1575 | designator_list designator 1576 ; 1577 1578 designator: /* C99 6.7.8 "Initialization" */ 1579 T_LBRACK range T_RBRACK { 1580 add_designator_subscript($2); 1581 if (!Sflag) 1582 /* array initializer with designators is a C99 ... */ 1583 warning(321); 1584 } 1585 | T_POINT identifier { 1586 if (!Sflag) 1587 /* struct or union member name in initializer is ... */ 1588 warning(313); 1589 add_designator_member($2); 1590 } 1591 ; 1592 1593 static_assert_declaration: 1594 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1595 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1596 ; 1597 1598 range: 1599 constant_expr { 1600 $$.lo = to_int_constant($1, true); 1601 $$.hi = $$.lo; 1602 } 1603 | constant_expr T_ELLIPSIS constant_expr { 1604 $$.lo = to_int_constant($1, true); 1605 $$.hi = to_int_constant($3, true); 1606 /* initialization with '[a...b]' is a GCC extension */ 1607 gnuism(340); 1608 } 1609 ; 1610 1611 init_lbrace: /* helper */ 1612 T_LBRACE { 1613 init_lbrace(); 1614 } 1615 ; 1616 1617 init_rbrace: /* helper */ 1618 T_RBRACE { 1619 init_rbrace(); 1620 } 1621 ; 1622 1623 asm_or_symbolrename_opt: /* GCC extensions */ 1624 /* empty */ { 1625 $$ = NULL; 1626 } 1627 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1628 freeyyv(&$3, T_STRING); 1629 $$ = NULL; 1630 } 1631 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1632 $$ = $3; 1633 } 1634 ; 1635 1636 statement: /* C99 6.8 */ 1637 expression_statement 1638 | non_expr_statement 1639 ; 1640 1641 non_expr_statement: /* helper for C99 6.8 */ 1642 type_attribute T_SEMI 1643 | labeled_statement 1644 | compound_statement 1645 | selection_statement 1646 | iteration_statement 1647 | jump_statement { 1648 seen_fallthrough = false; 1649 } 1650 | asm_statement 1651 ; 1652 1653 labeled_statement: /* C99 6.8.1 */ 1654 label type_attribute_opt statement 1655 ; 1656 1657 label: 1658 T_NAME T_COLON { 1659 symtyp = FLABEL; 1660 named_label(getsym($1)); 1661 } 1662 | T_CASE constant_expr T_COLON { 1663 case_label($2); 1664 seen_fallthrough = true; 1665 } 1666 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1667 /* XXX: We don't fill all cases */ 1668 case_label($2); 1669 seen_fallthrough = true; 1670 } 1671 | T_DEFAULT T_COLON { 1672 default_label(); 1673 seen_fallthrough = true; 1674 } 1675 ; 1676 1677 compound_statement: /* C99 6.8.2 */ 1678 compound_statement_lbrace compound_statement_rbrace 1679 | compound_statement_lbrace block_item_list compound_statement_rbrace 1680 ; 1681 1682 compound_statement_lbrace: 1683 T_LBRACE { 1684 block_level++; 1685 mem_block_level++; 1686 begin_declaration_level(DK_AUTO); 1687 } 1688 ; 1689 1690 compound_statement_rbrace: 1691 T_RBRACE { 1692 end_declaration_level(); 1693 level_free_all(mem_block_level); 1694 mem_block_level--; 1695 block_level--; 1696 seen_fallthrough = false; 1697 } 1698 ; 1699 1700 block_item_list: /* C99 6.8.2 */ 1701 block_item 1702 | block_item_list block_item { 1703 if (!Sflag && $1 && !$2) 1704 /* declarations after statements is a C99 feature */ 1705 c99ism(327); 1706 $$ = $1 || $2; 1707 } 1708 ; 1709 1710 block_item: /* C99 6.8.2 */ 1711 declaration_or_error { 1712 $$ = false; 1713 restore_warning_flags(); 1714 } 1715 | statement { 1716 $$ = true; 1717 restore_warning_flags(); 1718 } 1719 ; 1720 1721 expression_statement: /* C99 6.8.3 */ 1722 expression T_SEMI { 1723 expr($1, false, false, false, false); 1724 seen_fallthrough = false; 1725 } 1726 | T_SEMI { 1727 check_statement_reachable(); 1728 seen_fallthrough = false; 1729 } 1730 ; 1731 1732 selection_statement: /* C99 6.8.4 */ 1733 if_without_else %prec T_THEN { 1734 save_warning_flags(); 1735 if2(); 1736 if3(false); 1737 } 1738 | if_without_else T_ELSE { 1739 save_warning_flags(); 1740 if2(); 1741 } statement { 1742 clear_warning_flags(); 1743 if3(true); 1744 } 1745 | if_without_else T_ELSE error { 1746 clear_warning_flags(); 1747 if3(false); 1748 } 1749 | switch_expr statement { 1750 clear_warning_flags(); 1751 switch2(); 1752 } 1753 | switch_expr error { 1754 clear_warning_flags(); 1755 switch2(); 1756 } 1757 ; 1758 1759 if_without_else: /* see C99 6.8.4 */ 1760 if_expr statement 1761 | if_expr error 1762 ; 1763 1764 if_expr: /* see C99 6.8.4 */ 1765 T_IF T_LPAREN expression T_RPAREN { 1766 if1($3); 1767 clear_warning_flags(); 1768 } 1769 ; 1770 1771 switch_expr: /* see C99 6.8.4 */ 1772 T_SWITCH T_LPAREN expression T_RPAREN { 1773 switch1($3); 1774 clear_warning_flags(); 1775 } 1776 ; 1777 1778 iteration_statement: /* C99 6.8.5 */ 1779 while_expr statement { 1780 clear_warning_flags(); 1781 while2(); 1782 } 1783 | while_expr error { 1784 clear_warning_flags(); 1785 while2(); 1786 } 1787 | do_statement do_while_expr { 1788 do2($2); 1789 seen_fallthrough = false; 1790 } 1791 | do error { 1792 clear_warning_flags(); 1793 do2(NULL); 1794 } 1795 | for_exprs statement { 1796 clear_warning_flags(); 1797 for2(); 1798 end_declaration_level(); 1799 block_level--; 1800 } 1801 | for_exprs error { 1802 clear_warning_flags(); 1803 for2(); 1804 end_declaration_level(); 1805 block_level--; 1806 } 1807 ; 1808 1809 while_expr: /* see C99 6.8.5 */ 1810 T_WHILE T_LPAREN expression T_RPAREN { 1811 while1($3); 1812 clear_warning_flags(); 1813 } 1814 ; 1815 1816 do_statement: /* see C99 6.8.5 */ 1817 do statement { 1818 clear_warning_flags(); 1819 } 1820 ; 1821 1822 do: /* see C99 6.8.5 */ 1823 T_DO { 1824 do1(); 1825 } 1826 ; 1827 1828 do_while_expr: /* see C99 6.8.5 */ 1829 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1830 $$ = $3; 1831 } 1832 ; 1833 1834 for_start: /* see C99 6.8.5 */ 1835 T_FOR T_LPAREN { 1836 begin_declaration_level(DK_AUTO); 1837 block_level++; 1838 } 1839 ; 1840 1841 for_exprs: /* see C99 6.8.5 */ 1842 for_start 1843 begin_type_declaration_specifiers end_type 1844 notype_init_declarators T_SEMI 1845 expression_opt T_SEMI 1846 expression_opt T_RPAREN { 1847 /* variable declaration in for loop */ 1848 c99ism(325); 1849 for1(NULL, $6, $8); 1850 clear_warning_flags(); 1851 } 1852 | for_start 1853 expression_opt T_SEMI 1854 expression_opt T_SEMI 1855 expression_opt T_RPAREN { 1856 for1($2, $4, $6); 1857 clear_warning_flags(); 1858 } 1859 ; 1860 1861 jump_statement: /* C99 6.8.6 */ 1862 goto identifier T_SEMI { 1863 do_goto(getsym($2)); 1864 } 1865 | goto error T_SEMI { 1866 symtyp = FVFT; 1867 } 1868 | T_CONTINUE T_SEMI { 1869 do_continue(); 1870 } 1871 | T_BREAK T_SEMI { 1872 do_break(); 1873 } 1874 | T_RETURN sys T_SEMI { 1875 do_return($2, NULL); 1876 } 1877 | T_RETURN sys expression T_SEMI { 1878 do_return($2, $3); 1879 } 1880 ; 1881 1882 goto: /* see C99 6.8.6 */ 1883 T_GOTO { 1884 symtyp = FLABEL; 1885 } 1886 ; 1887 1888 asm_statement: /* GCC extension */ 1889 T_ASM T_LPAREN read_until_rparen T_SEMI { 1890 setasm(); 1891 } 1892 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1893 setasm(); 1894 } 1895 | T_ASM error 1896 ; 1897 1898 read_until_rparen: /* helper for 'asm_statement' */ 1899 /* empty */ { 1900 read_until_rparen(); 1901 } 1902 ; 1903 1904 translation_unit: /* C99 6.9 */ 1905 external_declaration 1906 | translation_unit external_declaration 1907 ; 1908 1909 external_declaration: /* C99 6.9 */ 1910 function_definition { 1911 global_clean_up_decl(false); 1912 clear_warning_flags(); 1913 } 1914 | top_level_declaration { 1915 global_clean_up_decl(false); 1916 clear_warning_flags(); 1917 } 1918 | asm_statement /* GCC extension */ 1919 | T_SEMI { /* GCC extension */ 1920 if (sflag) { 1921 /* empty declaration */ 1922 error(0); 1923 } else if (!tflag) { 1924 /* empty declaration */ 1925 warning(0); 1926 } 1927 } 1928 ; 1929 1930 /* 1931 * On the top level, lint allows several forms of declarations that it doesn't 1932 * allow in functions. For example, a single ';' is an empty declaration and 1933 * is supported by some compilers, but in a function it would be an empty 1934 * statement, not a declaration. This makes a difference in C90 mode, where 1935 * a statement must not be followed by a declaration. 1936 * 1937 * See 'declaration' for all other declarations. 1938 */ 1939 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1940 begin_type end_type notype_init_declarators T_SEMI { 1941 if (sflag) { 1942 /* old style declaration; add 'int' */ 1943 error(1); 1944 } else if (!tflag) { 1945 /* old style declaration; add 'int' */ 1946 warning(1); 1947 } 1948 } 1949 | declaration 1950 | error T_SEMI { 1951 global_clean_up(); 1952 } 1953 | error T_RBRACE { 1954 global_clean_up(); 1955 } 1956 ; 1957 1958 function_definition: /* C99 6.9.1 */ 1959 func_declarator { 1960 if ($1->s_type->t_tspec != FUNC) { 1961 /* syntax error '%s' */ 1962 error(249, yytext); 1963 YYERROR; 1964 } 1965 if ($1->s_type->t_typedef) { 1966 /* ()-less function definition */ 1967 error(64); 1968 YYERROR; 1969 } 1970 funcdef($1); 1971 block_level++; 1972 begin_declaration_level(DK_OLD_STYLE_ARG); 1973 if (lwarn == LWARN_NONE) 1974 $1->s_used = true; 1975 } arg_declaration_list_opt { 1976 end_declaration_level(); 1977 block_level--; 1978 check_func_lint_directives(); 1979 check_func_old_style_arguments(); 1980 begin_control_statement(CS_FUNCTION_BODY); 1981 } compound_statement { 1982 funcend(); 1983 end_control_statement(CS_FUNCTION_BODY); 1984 } 1985 ; 1986 1987 func_declarator: 1988 begin_type end_type notype_declarator { 1989 /* ^^ There is no check for the missing type-specifier. */ 1990 $$ = $3; 1991 } 1992 | begin_type_declmods end_type notype_declarator { 1993 /* ^^ There is no check for the missing type-specifier. */ 1994 $$ = $3; 1995 } 1996 | begin_type_declaration_specifiers end_type type_declarator { 1997 $$ = $3; 1998 } 1999 ; 2000 2001 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2002 /* empty */ 2003 | arg_declaration_list 2004 ; 2005 2006 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2007 arg_declaration 2008 | arg_declaration_list arg_declaration 2009 /* XXX or better "arg_declaration error" ? */ 2010 | error 2011 ; 2012 2013 /* 2014 * "arg_declaration" is separated from "declaration" because it 2015 * needs other error handling. 2016 */ 2017 arg_declaration: 2018 begin_type_declmods end_type T_SEMI { 2019 /* empty declaration */ 2020 warning(2); 2021 } 2022 | begin_type_declmods end_type notype_init_declarators T_SEMI 2023 | begin_type_declaration_specifiers end_type T_SEMI { 2024 if (!dcs->d_nonempty_decl) { 2025 /* empty declaration */ 2026 warning(2); 2027 } else { 2028 /* '%s' declared in argument declaration list */ 2029 warning(3, type_name(dcs->d_type)); 2030 } 2031 } 2032 | begin_type_declaration_specifiers end_type 2033 type_init_declarators T_SEMI { 2034 if (dcs->d_nonempty_decl) { 2035 /* '%s' declared in argument declaration list */ 2036 warning(3, type_name(dcs->d_type)); 2037 } 2038 } 2039 | begin_type_declmods error 2040 | begin_type_declaration_specifiers error 2041 ; 2042 2043 gcc_attribute_list_opt: 2044 /* empty */ 2045 | gcc_attribute_list 2046 ; 2047 2048 gcc_attribute_list: 2049 gcc_attribute 2050 | gcc_attribute_list gcc_attribute 2051 ; 2052 2053 gcc_attribute: 2054 T_ATTRIBUTE T_LPAREN T_LPAREN { 2055 in_gcc_attribute = true; 2056 } gcc_attribute_spec_list { 2057 in_gcc_attribute = false; 2058 } T_RPAREN T_RPAREN 2059 ; 2060 2061 gcc_attribute_spec_list: 2062 gcc_attribute_spec 2063 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2064 ; 2065 2066 gcc_attribute_spec: 2067 /* empty */ 2068 | T_AT_ALWAYS_INLINE 2069 | T_AT_ALIAS T_LPAREN string T_RPAREN 2070 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2071 | T_AT_ALIGNED 2072 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2073 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2074 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2075 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2076 | T_AT_COLD 2077 | T_AT_COMMON 2078 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2079 | T_AT_CONSTRUCTOR 2080 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2081 | T_AT_DEPRECATED 2082 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2083 | T_AT_DESTRUCTOR 2084 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2085 | T_AT_FALLTHROUGH { 2086 fallthru(1); 2087 } 2088 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2089 constant_expr T_COMMA constant_expr T_RPAREN 2090 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2091 | T_AT_GNU_INLINE 2092 | T_AT_HOT 2093 | T_AT_MALLOC 2094 | T_AT_MAY_ALIAS 2095 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2096 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2097 | T_AT_NO_SANITIZE_THREAD 2098 | T_AT_NOINLINE 2099 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2100 | T_AT_NONNULL 2101 | T_AT_NONSTRING 2102 | T_AT_NORETURN 2103 | T_AT_NOTHROW 2104 | T_AT_NO_INSTRUMENT_FUNCTION 2105 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2106 | T_AT_OPTNONE 2107 | T_AT_PACKED { 2108 addpacked(); 2109 } 2110 | T_AT_PCS T_LPAREN string T_RPAREN 2111 | T_AT_PURE 2112 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2113 | T_AT_RETURNS_NONNULL 2114 | T_AT_RETURNS_TWICE 2115 | T_AT_SECTION T_LPAREN string T_RPAREN 2116 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2117 | T_AT_SENTINEL 2118 | T_AT_TARGET T_LPAREN string T_RPAREN 2119 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2120 | T_AT_TUNION 2121 | T_AT_UNUSED { 2122 add_attr_used(); 2123 } 2124 | T_AT_USED { 2125 add_attr_used(); 2126 } 2127 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2128 | T_AT_WARN_UNUSED_RESULT 2129 | T_AT_WEAK 2130 | T_QUAL { 2131 if ($1 != CONST) 2132 yyerror("Bad attribute"); 2133 } 2134 ; 2135 2136 gcc_attribute_bounded: 2137 T_AT_MINBYTES 2138 | T_AT_STRING 2139 | T_AT_BUFFER 2140 ; 2141 2142 gcc_attribute_format: 2143 T_AT_FORMAT_GNU_PRINTF 2144 | T_AT_FORMAT_PRINTF 2145 | T_AT_FORMAT_SCANF 2146 | T_AT_FORMAT_STRFMON 2147 | T_AT_FORMAT_STRFTIME 2148 | T_AT_FORMAT_SYSLOG 2149 ; 2150 2151 sys: 2152 /* empty */ { 2153 $$ = in_system_header; 2154 } 2155 ; 2156 2157 %% 2158 2159 /* ARGSUSED */ 2160 int 2161 yyerror(const char *msg) 2162 { 2163 /* syntax error '%s' */ 2164 error(249, yytext); 2165 if (++sytxerr >= 5) 2166 norecover(); 2167 return 0; 2168 } 2169 2170 #if (defined(YYDEBUG) && YYDEBUG > 0 && defined(YYBYACC)) \ 2171 || (defined(YYDEBUG) && defined(YYBISON)) 2172 static const char * 2173 cgram_to_string(int token, YYSTYPE val) 2174 { 2175 2176 switch (token) { 2177 case T_INCDEC: 2178 case T_MULTIPLICATIVE: 2179 case T_ADDITIVE: 2180 case T_SHIFT: 2181 case T_RELATIONAL: 2182 case T_EQUALITY: 2183 case T_OPASSIGN: 2184 return modtab[val.y_op].m_name; 2185 case T_SCLASS: 2186 return scl_name(val.y_scl); 2187 case T_TYPE: 2188 case T_STRUCT_OR_UNION: 2189 return tspec_name(val.y_tspec); 2190 case T_QUAL: 2191 return tqual_name(val.y_tqual); 2192 case T_NAME: 2193 return val.y_name->sb_name; 2194 default: 2195 return "<none>"; 2196 } 2197 } 2198 #endif 2199 2200 #if defined(YYDEBUG) && defined(YYBISON) 2201 static inline void 2202 cgram_print(FILE *output, int token, YYSTYPE val) 2203 { 2204 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2205 } 2206 #endif 2207 2208 static void 2209 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2210 { 2211 declare(decl, initflg, renaming); 2212 if (renaming != NULL) 2213 freeyyv(&renaming, T_NAME); 2214 } 2215 2216 /* 2217 * Discard all input tokens up to and including the next 2218 * unmatched right paren 2219 */ 2220 static void 2221 read_until_rparen(void) 2222 { 2223 int level; 2224 2225 if (yychar < 0) 2226 yychar = yylex(); 2227 freeyyv(&yylval, yychar); 2228 2229 level = 1; 2230 while (yychar != T_RPAREN || --level > 0) { 2231 if (yychar == T_LPAREN) { 2232 level++; 2233 } else if (yychar <= 0) { 2234 break; 2235 } 2236 freeyyv(&yylval, yychar = yylex()); 2237 } 2238 2239 yyclearin; 2240 } 2241 2242 static sym_t * 2243 symbolrename(sym_t *s, sbuf_t *sb) 2244 { 2245 if (sb != NULL) 2246 s->s_rename = sb->sb_name; 2247 return s; 2248 } 2249
Indexes created Sun Oct 12 20:09:57 GMT 2025