cgram.y revision 1.385
1 %{ 2 /* $NetBSD: cgram.y,v 1.385 2022/02/27 11:40:29 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 1.385 2022/02/27 11:40:29 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->s_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 150 130 131 %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 %type <y_string> string2 296 297 %type <y_tnode> primary_expression 298 %type <y_tnode> generic_selection 299 %type <y_generic> generic_assoc_list 300 %type <y_generic> generic_association 301 %type <y_tnode> postfix_expression 302 %type <y_tnode> gcc_statement_expr_list 303 %type <y_tnode> gcc_statement_expr_item 304 %type <y_op> point_or_arrow 305 %type <y_tnode> argument_expression_list 306 %type <y_tnode> unary_expression 307 %type <y_tnode> cast_expression 308 %type <y_tnode> conditional_expression 309 %type <y_tnode> assignment_expression 310 %type <y_tnode> expression_opt 311 %type <y_tnode> expression 312 %type <y_tnode> constant_expr 313 314 %type <y_type> begin_type_typespec 315 %type <y_type> type_specifier 316 %type <y_type> notype_type_specifier 317 %type <y_type> struct_or_union_specifier 318 %type <y_tspec> struct_or_union 319 %type <y_sym> braced_struct_declaration_list 320 %type <y_sym> struct_declaration_list_with_rbrace 321 %type <y_sym> struct_declaration_list 322 %type <y_sym> struct_declaration 323 %type <y_sym> notype_struct_declarators 324 %type <y_sym> type_struct_declarators 325 %type <y_sym> notype_struct_declarator 326 %type <y_sym> type_struct_declarator 327 %type <y_type> enum_specifier 328 %type <y_sym> enum_declaration 329 %type <y_sym> enums_with_opt_comma 330 %type <y_sym> enumerator_list 331 %type <y_sym> enumerator 332 %type <y_qual_ptr> type_qualifier 333 %type <y_qual_ptr> pointer 334 %type <y_qual_ptr> asterisk 335 %type <y_qual_ptr> type_qualifier_list_opt 336 %type <y_qual_ptr> type_qualifier_list 337 %type <y_sym> notype_declarator 338 %type <y_sym> type_declarator 339 %type <y_sym> notype_direct_declarator 340 %type <y_sym> type_direct_declarator 341 %type <y_sym> type_param_declarator 342 %type <y_sym> notype_param_declarator 343 %type <y_sym> direct_param_declarator 344 %type <y_sym> direct_notype_param_declarator 345 %type <y_sym> param_list 346 %type <y_array_size> array_size_opt 347 %type <y_tnode> array_size 348 %type <y_sym> identifier_list 349 %type <y_type> type_name 350 %type <y_sym> abstract_declaration 351 %type <y_sym> abstract_declarator 352 %type <y_sym> direct_abstract_declarator 353 %type <y_sym> abstract_decl_param_list 354 %type <y_sym> vararg_parameter_type_list 355 %type <y_sym> parameter_type_list 356 %type <y_sym> parameter_declaration 357 %type <y_range> range 358 %type <y_name> asm_or_symbolrename_opt 359 360 %type <y_seen_statement> block_item_list 361 %type <y_seen_statement> block_item 362 %type <y_tnode> do_while_expr 363 %type <y_sym> func_declarator 364 %type <y_in_system_header> sys 365 366 %{ 367 #if defined(YYDEBUG) && defined(YYBISON) 368 static inline void cgram_print(FILE *, int, YYSTYPE); 369 #endif 370 %} 371 372 %% 373 374 program: 375 /* empty */ { 376 if (sflag) { 377 /* empty translation unit */ 378 error(272); 379 } else if (!tflag) { 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 $$ = $1; 402 } 403 ; 404 405 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 406 string: 407 T_STRING 408 | T_STRING string2 { 409 $$ = cat_strings($1, $2); 410 } 411 ; 412 413 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 414 string2: 415 T_STRING { 416 if (tflag) { 417 /* concatenated strings are illegal in traditional C */ 418 warning(219); 419 } 420 $$ = $1; 421 } 422 | string2 T_STRING { 423 $$ = cat_strings($1, $2); 424 } 425 ; 426 427 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 428 primary_expression: 429 T_NAME { 430 bool sys_name, sys_next; 431 sys_name = in_system_header; 432 if (yychar < 0) 433 yychar = yylex(); 434 sys_next = in_system_header; 435 in_system_header = sys_name; 436 $$ = build_name(getsym($1), yychar == T_LPAREN); 437 in_system_header = sys_next; 438 } 439 | T_CON { 440 $$ = build_constant(gettyp($1->v_tspec), $1); 441 } 442 | string { 443 $$ = build_string($1); 444 } 445 | T_LPAREN expression T_RPAREN { 446 if ($2 != NULL) 447 $2->tn_parenthesized = true; 448 $$ = $2; 449 } 450 | generic_selection 451 /* GCC primary-expression, see c_parser_postfix_expression */ 452 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 453 symtyp = FMEMBER; 454 $$ = build_offsetof($3, getsym($5)); 455 } 456 ; 457 458 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 459 generic_selection: 460 T_GENERIC T_LPAREN assignment_expression T_COMMA 461 generic_assoc_list T_RPAREN { 462 /* generic selection requires C11 or later */ 463 c11ism(345); 464 $$ = build_generic_selection($3, $5); 465 } 466 ; 467 468 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 469 generic_assoc_list: 470 generic_association 471 | generic_assoc_list T_COMMA generic_association { 472 $3->ga_prev = $1; 473 $$ = $3; 474 } 475 ; 476 477 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 478 generic_association: 479 type_name T_COLON assignment_expression { 480 $$ = block_zero_alloc(sizeof(*$$)); 481 $$->ga_arg = $1; 482 $$->ga_result = $3; 483 } 484 | T_DEFAULT T_COLON assignment_expression { 485 $$ = block_zero_alloc(sizeof(*$$)); 486 $$->ga_arg = NULL; 487 $$->ga_result = $3; 488 } 489 ; 490 491 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 492 postfix_expression: 493 primary_expression 494 | postfix_expression T_LBRACK sys expression T_RBRACK { 495 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 496 } 497 | postfix_expression T_LPAREN sys T_RPAREN { 498 $$ = build_function_call($1, $3, NULL); 499 } 500 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 501 $$ = build_function_call($1, $3, $4); 502 } 503 | postfix_expression point_or_arrow sys T_NAME { 504 $$ = build_member_access($1, $2, $3, $4); 505 } 506 | postfix_expression T_INCDEC sys { 507 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 508 } 509 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 510 sym_t *tmp = mktempsym($2); 511 begin_initialization(tmp); 512 cgram_declare(tmp, true, NULL); 513 } init_lbrace initializer_list comma_opt init_rbrace { 514 if (!Sflag) 515 /* compound literals are a C99/GCC extension */ 516 gnuism(319); 517 $$ = build_name(*current_initsym(), false); 518 end_initialization(); 519 } 520 | T_LPAREN compound_statement_lbrace { 521 begin_statement_expr(); 522 } gcc_statement_expr_list { 523 do_statement_expr($4); 524 } compound_statement_rbrace T_RPAREN { 525 $$ = end_statement_expr(); 526 } 527 ; 528 529 comma_opt: /* helper for 'postfix_expression' */ 530 /* empty */ 531 | T_COMMA 532 ; 533 534 /* 535 * The inner part of a GCC statement-expression of the form ({ ... }). 536 * 537 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 538 */ 539 gcc_statement_expr_list: 540 gcc_statement_expr_item 541 | gcc_statement_expr_list gcc_statement_expr_item { 542 $$ = $2; 543 } 544 ; 545 546 gcc_statement_expr_item: 547 declaration_or_error { 548 clear_warning_flags(); 549 $$ = NULL; 550 } 551 | non_expr_statement { 552 $$ = expr_alloc_tnode(); 553 $$->tn_type = gettyp(VOID); 554 } 555 | expression T_SEMI { 556 if ($1 == NULL) { /* in case of syntax errors */ 557 $$ = expr_alloc_tnode(); 558 $$->tn_type = gettyp(VOID); 559 } else { 560 /* XXX: do that only on the last name */ 561 if ($1->tn_op == NAME) 562 $1->tn_sym->s_used = true; 563 expr($1, false, false, false, false); 564 seen_fallthrough = false; 565 $$ = $1; 566 } 567 } 568 ; 569 570 point_or_arrow: /* helper for 'postfix_expression' */ 571 T_POINT { 572 symtyp = FMEMBER; 573 $$ = POINT; 574 } 575 | T_ARROW { 576 symtyp = FMEMBER; 577 $$ = ARROW; 578 } 579 ; 580 581 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 582 argument_expression_list: 583 assignment_expression { 584 $$ = build_function_argument(NULL, $1); 585 } 586 | argument_expression_list T_COMMA assignment_expression { 587 $$ = build_function_argument($1, $3); 588 } 589 ; 590 591 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 592 unary_expression: 593 postfix_expression 594 | T_INCDEC sys unary_expression { 595 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 596 } 597 | T_AMPER sys cast_expression { 598 $$ = build_unary(ADDR, $2, $3); 599 } 600 | T_ASTERISK sys cast_expression { 601 $$ = build_unary(INDIR, $2, $3); 602 } 603 | T_ADDITIVE sys cast_expression { 604 if (tflag && $1 == PLUS) { 605 /* unary + is illegal in traditional C */ 606 warning(100); 607 } 608 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 609 } 610 | T_COMPLEMENT sys cast_expression { 611 $$ = build_unary(COMPL, $2, $3); 612 } 613 | T_LOGNOT sys cast_expression { 614 $$ = build_unary(NOT, $2, $3); 615 } 616 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 617 $$ = build_unary(REAL, $2, $3); 618 } 619 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 620 $$ = build_unary(IMAG, $2, $3); 621 } 622 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 623 $$ = $2; 624 } 625 | T_SIZEOF unary_expression { 626 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 627 if ($$ != NULL) 628 check_expr_misc($2, 629 false, false, false, false, false, true); 630 } 631 | T_SIZEOF T_LPAREN type_name T_RPAREN { 632 $$ = build_sizeof($3); 633 } 634 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 635 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 636 /* TODO: c11ism */ 637 $$ = build_alignof($3); 638 } 639 ; 640 641 /* The rule 'unary_operator' is inlined into unary_expression. */ 642 643 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 644 cast_expression: 645 unary_expression 646 | T_LPAREN type_name T_RPAREN cast_expression { 647 $$ = cast($4, $2); 648 } 649 ; 650 651 expression_opt: 652 /* empty */ { 653 $$ = NULL; 654 } 655 | expression 656 ; 657 658 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 659 /* 'conditional_expression' also implements 'additive_expression'. */ 660 /* 'conditional_expression' also implements 'shift_expression'. */ 661 /* 'conditional_expression' also implements 'relational_expression'. */ 662 /* 'conditional_expression' also implements 'equality_expression'. */ 663 /* 'conditional_expression' also implements 'AND_expression'. */ 664 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 665 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 666 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 667 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 668 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 669 conditional_expression: 670 cast_expression 671 | conditional_expression T_ASTERISK sys conditional_expression { 672 $$ = build_binary($1, MULT, $3, $4); 673 } 674 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 675 $$ = build_binary($1, $2, $3, $4); 676 } 677 | conditional_expression T_ADDITIVE sys conditional_expression { 678 $$ = build_binary($1, $2, $3, $4); 679 } 680 | conditional_expression T_SHIFT sys conditional_expression { 681 $$ = build_binary($1, $2, $3, $4); 682 } 683 | conditional_expression T_RELATIONAL sys conditional_expression { 684 $$ = build_binary($1, $2, $3, $4); 685 } 686 | conditional_expression T_EQUALITY sys conditional_expression { 687 $$ = build_binary($1, $2, $3, $4); 688 } 689 | conditional_expression T_AMPER sys conditional_expression { 690 $$ = build_binary($1, BITAND, $3, $4); 691 } 692 | conditional_expression T_BITXOR sys conditional_expression { 693 $$ = build_binary($1, BITXOR, $3, $4); 694 } 695 | conditional_expression T_BITOR sys conditional_expression { 696 $$ = build_binary($1, BITOR, $3, $4); 697 } 698 | conditional_expression T_LOGAND sys conditional_expression { 699 $$ = build_binary($1, LOGAND, $3, $4); 700 } 701 | conditional_expression T_LOGOR sys conditional_expression { 702 $$ = build_binary($1, LOGOR, $3, $4); 703 } 704 | conditional_expression T_QUEST sys 705 expression T_COLON sys conditional_expression { 706 $$ = build_binary($1, QUEST, $3, 707 build_binary($4, COLON, $6, $7)); 708 } 709 ; 710 711 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 712 assignment_expression: 713 conditional_expression 714 | unary_expression T_ASSIGN sys assignment_expression { 715 $$ = build_binary($1, ASSIGN, $3, $4); 716 } 717 | unary_expression T_OPASSIGN sys assignment_expression { 718 $$ = build_binary($1, $2, $3, $4); 719 } 720 ; 721 722 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 723 expression: 724 assignment_expression 725 | expression T_COMMA sys assignment_expression { 726 $$ = build_binary($1, COMMA, $3, $4); 727 } 728 ; 729 730 constant_expr_list_opt: /* helper for gcc_attribute */ 731 /* empty */ 732 | constant_expr_list 733 ; 734 735 constant_expr_list: /* helper for gcc_attribute */ 736 constant_expr 737 | constant_expr_list T_COMMA constant_expr 738 ; 739 740 constant_expr: /* C99 6.6 */ 741 conditional_expression 742 ; 743 744 declaration_or_error: 745 declaration 746 | error T_SEMI 747 ; 748 749 declaration: /* C99 6.7 */ 750 begin_type_declmods end_type T_SEMI { 751 if (dcs->d_scl == TYPEDEF) { 752 /* typedef declares no type name */ 753 warning(72); 754 } else { 755 /* empty declaration */ 756 warning(2); 757 } 758 } 759 | begin_type_declmods end_type notype_init_declarators T_SEMI 760 /* ^^ There is no check for the missing type-specifier. */ 761 | begin_type_declaration_specifiers end_type T_SEMI { 762 if (dcs->d_scl == TYPEDEF) { 763 /* typedef declares no type name */ 764 warning(72); 765 } else if (!dcs->d_nonempty_decl) { 766 /* empty declaration */ 767 warning(2); 768 } 769 } 770 | begin_type_declaration_specifiers end_type 771 type_init_declarators T_SEMI 772 | static_assert_declaration 773 ; 774 775 begin_type_declaration_specifiers: /* see C99 6.7 */ 776 begin_type_typespec { 777 add_type($1); 778 } 779 | begin_type_declmods type_specifier { 780 add_type($2); 781 } 782 | type_attribute begin_type_declaration_specifiers 783 | begin_type_declaration_specifiers declmod 784 | begin_type_declaration_specifiers notype_type_specifier { 785 add_type($2); 786 } 787 ; 788 789 begin_type_declmods: /* see C99 6.7 */ 790 begin_type T_QUAL { 791 add_qualifier($2); 792 } 793 | begin_type T_SCLASS { 794 add_storage_class($2); 795 } 796 | begin_type_declmods declmod 797 ; 798 799 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 800 begin_type_specifier_qualifier_list_postfix 801 | type_attribute_list begin_type_specifier_qualifier_list_postfix 802 ; 803 804 begin_type_specifier_qualifier_list_postfix: 805 begin_type_typespec { 806 add_type($1); 807 } 808 | begin_type_qualifier_list type_specifier { 809 add_type($2); 810 } 811 | begin_type_specifier_qualifier_list_postfix T_QUAL { 812 add_qualifier($2); 813 } 814 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 815 add_type($2); 816 } 817 | begin_type_specifier_qualifier_list_postfix type_attribute 818 ; 819 820 begin_type_typespec: 821 begin_type notype_type_specifier { 822 $$ = $2; 823 } 824 | T_TYPENAME begin_type { 825 $$ = getsym($1)->s_type; 826 } 827 ; 828 829 begin_type_qualifier_list: 830 begin_type T_QUAL { 831 add_qualifier($2); 832 } 833 | begin_type_qualifier_list T_QUAL { 834 add_qualifier($2); 835 } 836 ; 837 838 declmod: 839 T_QUAL { 840 add_qualifier($1); 841 } 842 | T_SCLASS { 843 add_storage_class($1); 844 } 845 | type_attribute_list 846 ; 847 848 type_attribute_list: 849 type_attribute 850 | type_attribute_list type_attribute 851 ; 852 853 type_attribute_opt: 854 /* empty */ 855 | type_attribute 856 ; 857 858 type_attribute: /* See C11 6.7 declaration-specifiers */ 859 gcc_attribute 860 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 861 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 862 | T_PACKED { 863 addpacked(); 864 } 865 | T_NORETURN 866 ; 867 868 begin_type: 869 /* empty */ { 870 begin_type(); 871 } 872 ; 873 874 end_type: 875 /* empty */ { 876 end_type(); 877 } 878 ; 879 880 type_specifier: /* C99 6.7.2 */ 881 notype_type_specifier 882 | T_TYPENAME { 883 $$ = getsym($1)->s_type; 884 } 885 ; 886 887 notype_type_specifier: /* see C99 6.7.2 */ 888 T_TYPE { 889 $$ = gettyp($1); 890 } 891 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 892 $$ = $3->tn_type; 893 } 894 | struct_or_union_specifier { 895 end_declaration_level(); 896 $$ = $1; 897 } 898 | enum_specifier { 899 end_declaration_level(); 900 $$ = $1; 901 } 902 ; 903 904 struct_or_union_specifier: /* C99 6.7.2.1 */ 905 struct_or_union identifier_sym { 906 /* 907 * STDC requires that "struct a;" always introduces 908 * a new tag if "a" is not declared at current level 909 * 910 * yychar is valid because otherwise the parser would not 911 * have been able to decide if it must shift or reduce 912 */ 913 $$ = mktag($2, $1, false, yychar == T_SEMI); 914 } 915 | struct_or_union identifier_sym { 916 dcs->d_tagtyp = mktag($2, $1, true, false); 917 } braced_struct_declaration_list { 918 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 919 } 920 | struct_or_union { 921 dcs->d_tagtyp = mktag(NULL, $1, true, false); 922 } braced_struct_declaration_list { 923 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 924 } 925 | struct_or_union error { 926 symtyp = FVFT; 927 $$ = gettyp(INT); 928 } 929 ; 930 931 struct_or_union: /* C99 6.7.2.1 */ 932 T_STRUCT_OR_UNION { 933 symtyp = FTAG; 934 begin_declaration_level($1 == STRUCT ? MOS : MOU); 935 dcs->d_offset = 0; 936 dcs->d_sou_align_in_bits = CHAR_SIZE; 937 $$ = $1; 938 } 939 | struct_or_union type_attribute 940 ; 941 942 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 943 struct_declaration_lbrace struct_declaration_list_with_rbrace { 944 $$ = $2; 945 } 946 ; 947 948 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 949 T_LBRACE { 950 symtyp = FVFT; 951 } 952 ; 953 954 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 955 struct_declaration_list T_RBRACE 956 | T_RBRACE { 957 /* XXX: This is not allowed by any C standard. */ 958 $$ = NULL; 959 } 960 ; 961 962 struct_declaration_list: /* C99 6.7.2.1 */ 963 struct_declaration 964 | struct_declaration_list struct_declaration { 965 $$ = lnklst($1, $2); 966 } 967 ; 968 969 struct_declaration: /* C99 6.7.2.1 */ 970 begin_type_qualifier_list end_type { 971 /* ^^ There is no check for the missing type-specifier. */ 972 /* too late, i know, but getsym() compensates it */ 973 symtyp = FMEMBER; 974 } notype_struct_declarators type_attribute_opt T_SEMI { 975 symtyp = FVFT; 976 $$ = $4; 977 } 978 | begin_type_specifier_qualifier_list end_type { 979 symtyp = FMEMBER; 980 } type_struct_declarators type_attribute_opt T_SEMI { 981 symtyp = FVFT; 982 $$ = $4; 983 } 984 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 985 /* syntax error '%s' */ 986 error(249, "member without type"); 987 $$ = NULL; 988 } 989 | begin_type_specifier_qualifier_list end_type type_attribute_opt 990 T_SEMI { 991 symtyp = FVFT; 992 if (!Sflag) 993 /* anonymous struct/union members is a C11 feature */ 994 warning(49); 995 if (is_struct_or_union(dcs->d_type->t_tspec)) { 996 $$ = dcs->d_type->t_str->sou_first_member; 997 /* add all the members of the anonymous struct/union */ 998 anonymize($$); 999 } else { 1000 /* syntax error '%s' */ 1001 error(249, "unnamed member"); 1002 $$ = NULL; 1003 } 1004 } 1005 | static_assert_declaration { 1006 $$ = NULL; 1007 } 1008 | error T_SEMI { 1009 symtyp = FVFT; 1010 $$ = NULL; 1011 } 1012 ; 1013 1014 notype_struct_declarators: 1015 notype_struct_declarator { 1016 $$ = declarator_1_struct_union($1); 1017 } 1018 | notype_struct_declarators { 1019 symtyp = FMEMBER; 1020 } T_COMMA type_struct_declarator { 1021 $$ = lnklst($1, declarator_1_struct_union($4)); 1022 } 1023 ; 1024 1025 type_struct_declarators: 1026 type_struct_declarator { 1027 $$ = declarator_1_struct_union($1); 1028 } 1029 | type_struct_declarators { 1030 symtyp = FMEMBER; 1031 } T_COMMA type_struct_declarator { 1032 $$ = lnklst($1, declarator_1_struct_union($4)); 1033 } 1034 ; 1035 1036 notype_struct_declarator: 1037 notype_declarator 1038 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1039 $$ = bitfield($1, to_int_constant($3, true)); 1040 } 1041 | { 1042 symtyp = FVFT; 1043 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1044 $$ = bitfield(NULL, to_int_constant($3, true)); 1045 } 1046 ; 1047 1048 type_struct_declarator: 1049 type_declarator 1050 | type_declarator T_COLON constant_expr { 1051 $$ = bitfield($1, to_int_constant($3, true)); 1052 } 1053 | { 1054 symtyp = FVFT; 1055 } T_COLON constant_expr { 1056 $$ = bitfield(NULL, to_int_constant($3, true)); 1057 } 1058 ; 1059 1060 enum_specifier: /* C99 6.7.2.2 */ 1061 enum gcc_attribute_list_opt identifier_sym { 1062 $$ = mktag($3, ENUM, false, false); 1063 } 1064 | enum gcc_attribute_list_opt identifier_sym { 1065 dcs->d_tagtyp = mktag($3, ENUM, true, false); 1066 } enum_declaration /*gcc_attribute_list_opt*/ { 1067 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1068 } 1069 | enum gcc_attribute_list_opt { 1070 dcs->d_tagtyp = mktag(NULL, ENUM, true, false); 1071 } enum_declaration /*gcc_attribute_list_opt*/ { 1072 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1073 } 1074 | enum error { 1075 symtyp = FVFT; 1076 $$ = gettyp(INT); 1077 } 1078 ; 1079 1080 enum: /* helper for C99 6.7.2.2 */ 1081 T_ENUM { 1082 symtyp = FTAG; 1083 begin_declaration_level(CTCONST); 1084 } 1085 ; 1086 1087 enum_declaration: /* helper for C99 6.7.2.2 */ 1088 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1089 $$ = $2; 1090 } 1091 ; 1092 1093 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1094 T_LBRACE { 1095 symtyp = FVFT; 1096 enumval = 0; 1097 } 1098 ; 1099 1100 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1101 enumerator_list 1102 | enumerator_list T_COMMA { 1103 if (sflag) { 1104 /* trailing ',' prohibited in enum declaration */ 1105 error(54); 1106 } else { 1107 /* trailing ',' prohibited in enum declaration */ 1108 c99ism(54); 1109 } 1110 $$ = $1; 1111 } 1112 ; 1113 1114 enumerator_list: /* C99 6.7.2.2 */ 1115 enumerator 1116 | enumerator_list T_COMMA enumerator { 1117 $$ = lnklst($1, $3); 1118 } 1119 | error { 1120 $$ = NULL; 1121 } 1122 ; 1123 1124 enumerator: /* C99 6.7.2.2 */ 1125 identifier_sym gcc_attribute_list_opt { 1126 $$ = enumeration_constant($1, enumval, true); 1127 } 1128 | identifier_sym gcc_attribute_list_opt T_ASSIGN constant_expr { 1129 $$ = enumeration_constant($1, to_int_constant($4, true), 1130 false); 1131 } 1132 ; 1133 1134 type_qualifier: /* C99 6.7.3 */ 1135 T_QUAL { 1136 $$ = xcalloc(1, sizeof(*$$)); 1137 if ($1 == CONST) 1138 $$->p_const = true; 1139 if ($1 == VOLATILE) 1140 $$->p_volatile = true; 1141 } 1142 ; 1143 1144 pointer: /* C99 6.7.5 */ 1145 asterisk type_qualifier_list_opt { 1146 $$ = merge_qualified_pointer($1, $2); 1147 } 1148 | asterisk type_qualifier_list_opt pointer { 1149 $$ = merge_qualified_pointer($1, $2); 1150 $$ = merge_qualified_pointer($$, $3); 1151 } 1152 ; 1153 1154 asterisk: /* helper for 'pointer' */ 1155 T_ASTERISK { 1156 $$ = xcalloc(1, sizeof(*$$)); 1157 $$->p_pointer = true; 1158 } 1159 ; 1160 1161 type_qualifier_list_opt: /* see C99 6.7.5 */ 1162 /* empty */ { 1163 $$ = NULL; 1164 } 1165 | type_qualifier_list 1166 ; 1167 1168 type_qualifier_list: /* C99 6.7.5 */ 1169 type_qualifier 1170 | type_qualifier_list type_qualifier { 1171 $$ = merge_qualified_pointer($1, $2); 1172 } 1173 ; 1174 1175 /* 1176 * For an explanation of 'notype' in the following rules, see 1177 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1178 */ 1179 1180 notype_init_declarators: 1181 notype_init_declarator 1182 | notype_init_declarators T_COMMA type_init_declarator 1183 ; 1184 1185 type_init_declarators: 1186 type_init_declarator 1187 | type_init_declarators T_COMMA type_init_declarator 1188 ; 1189 1190 notype_init_declarator: 1191 notype_declarator asm_or_symbolrename_opt { 1192 cgram_declare($1, false, $2); 1193 check_size($1); 1194 } 1195 | notype_declarator asm_or_symbolrename_opt { 1196 begin_initialization($1); 1197 cgram_declare($1, true, $2); 1198 } T_ASSIGN initializer { 1199 check_size($1); 1200 end_initialization(); 1201 } 1202 ; 1203 1204 type_init_declarator: 1205 type_declarator asm_or_symbolrename_opt { 1206 cgram_declare($1, false, $2); 1207 check_size($1); 1208 } 1209 | type_declarator asm_or_symbolrename_opt { 1210 begin_initialization($1); 1211 cgram_declare($1, true, $2); 1212 } T_ASSIGN initializer { 1213 check_size($1); 1214 end_initialization(); 1215 } 1216 ; 1217 1218 notype_declarator: 1219 notype_direct_declarator 1220 | pointer notype_direct_declarator { 1221 $$ = add_pointer($2, $1); 1222 } 1223 ; 1224 1225 type_declarator: 1226 type_direct_declarator 1227 | pointer type_direct_declarator { 1228 $$ = add_pointer($2, $1); 1229 } 1230 ; 1231 1232 notype_direct_declarator: 1233 T_NAME { 1234 $$ = declarator_name(getsym($1)); 1235 } 1236 | T_LPAREN type_declarator T_RPAREN { 1237 $$ = $2; 1238 } 1239 | type_attribute notype_direct_declarator { 1240 $$ = $2; 1241 } 1242 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1243 $$ = add_array($1, $3.has_dim, $3.dim); 1244 } 1245 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1246 $$ = add_function(symbolrename($1, $3), $2); 1247 end_declaration_level(); 1248 block_level--; 1249 } 1250 | notype_direct_declarator type_attribute 1251 ; 1252 1253 type_direct_declarator: 1254 identifier { 1255 $$ = declarator_name(getsym($1)); 1256 } 1257 | T_LPAREN type_declarator T_RPAREN { 1258 $$ = $2; 1259 } 1260 | type_attribute type_direct_declarator { 1261 $$ = $2; 1262 } 1263 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1264 $$ = add_array($1, $3.has_dim, $3.dim); 1265 } 1266 | type_direct_declarator param_list asm_or_symbolrename_opt { 1267 $$ = add_function(symbolrename($1, $3), $2); 1268 end_declaration_level(); 1269 block_level--; 1270 } 1271 | type_direct_declarator type_attribute 1272 ; 1273 1274 /* 1275 * The two distinct rules type_param_declarator and notype_param_declarator 1276 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1277 * always treated as a typename, not an argument name. For example, after 1278 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1279 * "f(int (double));", not "f(int a);". 1280 */ 1281 type_param_declarator: 1282 direct_param_declarator 1283 | pointer direct_param_declarator { 1284 $$ = add_pointer($2, $1); 1285 } 1286 ; 1287 1288 notype_param_declarator: 1289 direct_notype_param_declarator 1290 | pointer direct_notype_param_declarator { 1291 $$ = add_pointer($2, $1); 1292 } 1293 ; 1294 1295 direct_param_declarator: 1296 identifier type_attribute_list { 1297 $$ = declarator_name(getsym($1)); 1298 } 1299 | identifier { 1300 $$ = declarator_name(getsym($1)); 1301 } 1302 | T_LPAREN notype_param_declarator T_RPAREN { 1303 $$ = $2; 1304 } 1305 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1306 gcc_attribute_list_opt { 1307 $$ = add_array($1, $3.has_dim, $3.dim); 1308 } 1309 | direct_param_declarator param_list asm_or_symbolrename_opt { 1310 $$ = add_function(symbolrename($1, $3), $2); 1311 end_declaration_level(); 1312 block_level--; 1313 } 1314 ; 1315 1316 direct_notype_param_declarator: 1317 identifier { 1318 $$ = declarator_name(getsym($1)); 1319 } 1320 | T_LPAREN notype_param_declarator T_RPAREN { 1321 $$ = $2; 1322 } 1323 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1324 $$ = add_array($1, $3.has_dim, $3.dim); 1325 } 1326 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1327 $$ = add_function(symbolrename($1, $3), $2); 1328 end_declaration_level(); 1329 block_level--; 1330 } 1331 ; 1332 1333 param_list: 1334 id_list_lparen identifier_list T_RPAREN { 1335 $$ = $2; 1336 } 1337 | abstract_decl_param_list 1338 ; 1339 1340 id_list_lparen: 1341 T_LPAREN { 1342 block_level++; 1343 begin_declaration_level(PROTO_ARG); 1344 } 1345 ; 1346 1347 array_size_opt: 1348 /* empty */ { 1349 $$.has_dim = false; 1350 $$.dim = 0; 1351 } 1352 | T_ASTERISK { 1353 /* since C99; variable length array of unspecified size */ 1354 $$.has_dim = false; /* TODO: maybe change to true */ 1355 $$.dim = 0; /* just as a placeholder */ 1356 } 1357 | array_size { 1358 $$.has_dim = true; 1359 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1360 } 1361 ; 1362 1363 array_size: 1364 type_qualifier_list_opt T_SCLASS constant_expr { 1365 /* C11 6.7.6.3p7 */ 1366 if ($2 != STATIC) 1367 yyerror("Bad attribute"); 1368 /* static array size is a C11 extension */ 1369 c11ism(343); 1370 $$ = $3; 1371 } 1372 | T_QUAL { 1373 /* C11 6.7.6.2 */ 1374 if ($1 != RESTRICT) 1375 yyerror("Bad attribute"); 1376 $$ = NULL; 1377 } 1378 | constant_expr 1379 ; 1380 1381 identifier_list: /* C99 6.7.5 */ 1382 T_NAME { 1383 $$ = old_style_function_name(getsym($1)); 1384 } 1385 | identifier_list T_COMMA T_NAME { 1386 $$ = lnklst($1, old_style_function_name(getsym($3))); 1387 } 1388 | identifier_list error 1389 ; 1390 1391 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1392 type_name: /* C99 6.7.6 */ 1393 { 1394 begin_declaration_level(ABSTRACT); 1395 } abstract_declaration { 1396 end_declaration_level(); 1397 $$ = $2->s_type; 1398 } 1399 ; 1400 1401 abstract_declaration: /* specific to lint */ 1402 begin_type_qualifier_list end_type { 1403 $$ = declare_1_abstract(abstract_name()); 1404 } 1405 | begin_type_specifier_qualifier_list end_type { 1406 $$ = declare_1_abstract(abstract_name()); 1407 } 1408 | begin_type_qualifier_list end_type abstract_declarator { 1409 $$ = declare_1_abstract($3); 1410 } 1411 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1412 $$ = declare_1_abstract($3); 1413 } 1414 ; 1415 1416 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1417 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1418 abstract_declarator: 1419 pointer { 1420 $$ = add_pointer(abstract_name(), $1); 1421 } 1422 | direct_abstract_declarator 1423 | pointer direct_abstract_declarator { 1424 $$ = add_pointer($2, $1); 1425 } 1426 ; 1427 1428 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1429 direct_abstract_declarator: 1430 /* TODO: sort rules according to C99 */ 1431 T_LPAREN abstract_declarator T_RPAREN { 1432 $$ = $2; 1433 } 1434 | T_LBRACK array_size_opt T_RBRACK { 1435 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1436 } 1437 | type_attribute direct_abstract_declarator { 1438 $$ = $2; 1439 } 1440 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1441 $$ = add_array($1, $3.has_dim, $3.dim); 1442 } 1443 | abstract_decl_param_list asm_or_symbolrename_opt { 1444 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1445 end_declaration_level(); 1446 block_level--; 1447 } 1448 | direct_abstract_declarator abstract_decl_param_list 1449 asm_or_symbolrename_opt { 1450 $$ = add_function(symbolrename($1, $3), $2); 1451 end_declaration_level(); 1452 block_level--; 1453 } 1454 | direct_abstract_declarator type_attribute_list 1455 ; 1456 1457 abstract_decl_param_list: /* specific to lint */ 1458 abstract_decl_lparen T_RPAREN type_attribute_opt { 1459 $$ = NULL; 1460 } 1461 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1462 type_attribute_opt { 1463 dcs->d_proto = true; 1464 $$ = $2; 1465 } 1466 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1467 $$ = NULL; 1468 } 1469 ; 1470 1471 abstract_decl_lparen: /* specific to lint */ 1472 T_LPAREN { 1473 block_level++; 1474 begin_declaration_level(PROTO_ARG); 1475 } 1476 ; 1477 1478 vararg_parameter_type_list: /* specific to lint */ 1479 parameter_type_list 1480 | parameter_type_list T_COMMA T_ELLIPSIS { 1481 dcs->d_vararg = true; 1482 $$ = $1; 1483 } 1484 | T_ELLIPSIS { 1485 if (sflag) { 1486 /* ANSI C requires formal parameter before '...' */ 1487 error(84); 1488 } else if (!tflag) { 1489 /* ANSI C requires formal parameter before '...' */ 1490 warning(84); 1491 } 1492 dcs->d_vararg = true; 1493 $$ = NULL; 1494 } 1495 ; 1496 1497 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1498 parameter_type_list: 1499 parameter_declaration 1500 | parameter_type_list T_COMMA parameter_declaration { 1501 $$ = lnklst($1, $3); 1502 } 1503 ; 1504 1505 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1506 parameter_declaration: 1507 begin_type_declmods end_type { 1508 /* ^^ There is no check for the missing type-specifier. */ 1509 $$ = declare_argument(abstract_name(), false); 1510 } 1511 | begin_type_declaration_specifiers end_type { 1512 $$ = declare_argument(abstract_name(), false); 1513 } 1514 | begin_type_declmods end_type notype_param_declarator { 1515 /* ^^ There is no check for the missing type-specifier. */ 1516 $$ = declare_argument($3, false); 1517 } 1518 /* 1519 * type_param_declarator is needed because of following conflict: 1520 * "typedef int a; f(int (a));" could be parsed as 1521 * "function with argument a of type int", or 1522 * "function with an abstract argument of type function". 1523 * This grammar realizes the second case. 1524 */ 1525 | begin_type_declaration_specifiers end_type type_param_declarator { 1526 $$ = declare_argument($3, false); 1527 } 1528 | begin_type_declmods end_type abstract_declarator { 1529 /* ^^ There is no check for the missing type-specifier. */ 1530 $$ = declare_argument($3, false); 1531 } 1532 | begin_type_declaration_specifiers end_type abstract_declarator { 1533 $$ = declare_argument($3, false); 1534 } 1535 ; 1536 1537 initializer: /* C99 6.7.8 "Initialization" */ 1538 assignment_expression { 1539 init_expr($1); 1540 } 1541 | init_lbrace init_rbrace { 1542 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1543 } 1544 | init_lbrace initializer_list comma_opt init_rbrace 1545 /* XXX: What is this error handling for? */ 1546 | error 1547 ; 1548 1549 initializer_list: /* C99 6.7.8 "Initialization" */ 1550 initializer_list_item 1551 | initializer_list T_COMMA initializer_list_item 1552 ; 1553 1554 initializer_list_item: /* helper */ 1555 designation initializer 1556 | initializer 1557 ; 1558 1559 designation: /* C99 6.7.8 "Initialization" */ 1560 begin_designation designator_list T_ASSIGN 1561 | identifier T_COLON { 1562 /* GCC style struct or union member name in initializer */ 1563 gnuism(315); 1564 begin_designation(); 1565 add_designator_member($1); 1566 } 1567 ; 1568 1569 begin_designation: /* lint-specific helper */ 1570 /* empty */ { 1571 begin_designation(); 1572 } 1573 ; 1574 1575 designator_list: /* C99 6.7.8 "Initialization" */ 1576 designator 1577 | designator_list designator 1578 ; 1579 1580 designator: /* C99 6.7.8 "Initialization" */ 1581 T_LBRACK range T_RBRACK { 1582 add_designator_subscript($2); 1583 if (!Sflag) 1584 /* array initializer with designators is a C99 ... */ 1585 warning(321); 1586 } 1587 | T_POINT identifier { 1588 if (!Sflag) 1589 /* struct or union member name in initializer is ... */ 1590 warning(313); 1591 add_designator_member($2); 1592 } 1593 ; 1594 1595 static_assert_declaration: 1596 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1597 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1598 ; 1599 1600 range: 1601 constant_expr { 1602 $$.lo = to_int_constant($1, true); 1603 $$.hi = $$.lo; 1604 } 1605 | constant_expr T_ELLIPSIS constant_expr { 1606 $$.lo = to_int_constant($1, true); 1607 $$.hi = to_int_constant($3, true); 1608 /* initialization with '[a...b]' is a GCC extension */ 1609 gnuism(340); 1610 } 1611 ; 1612 1613 init_lbrace: /* helper */ 1614 T_LBRACE { 1615 init_lbrace(); 1616 } 1617 ; 1618 1619 init_rbrace: /* helper */ 1620 T_RBRACE { 1621 init_rbrace(); 1622 } 1623 ; 1624 1625 asm_or_symbolrename_opt: /* GCC extensions */ 1626 /* empty */ { 1627 $$ = NULL; 1628 } 1629 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_list_opt { 1630 freeyyv(&$3, T_STRING); 1631 $$ = NULL; 1632 } 1633 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN gcc_attribute_list_opt { 1634 $$ = $3; 1635 } 1636 ; 1637 1638 statement: /* C99 6.8 */ 1639 expression_statement 1640 | non_expr_statement 1641 ; 1642 1643 non_expr_statement: /* helper for C99 6.8 */ 1644 type_attribute T_SEMI 1645 | labeled_statement 1646 | compound_statement 1647 | selection_statement 1648 | iteration_statement 1649 | jump_statement { 1650 seen_fallthrough = false; 1651 } 1652 | asm_statement 1653 ; 1654 1655 labeled_statement: /* C99 6.8.1 */ 1656 label type_attribute_opt statement 1657 ; 1658 1659 label: 1660 T_NAME T_COLON { 1661 symtyp = FLABEL; 1662 named_label(getsym($1)); 1663 } 1664 | T_CASE constant_expr T_COLON { 1665 case_label($2); 1666 seen_fallthrough = true; 1667 } 1668 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1669 /* XXX: We don't fill all cases */ 1670 case_label($2); 1671 seen_fallthrough = true; 1672 } 1673 | T_DEFAULT T_COLON { 1674 default_label(); 1675 seen_fallthrough = true; 1676 } 1677 ; 1678 1679 compound_statement: /* C99 6.8.2 */ 1680 compound_statement_lbrace compound_statement_rbrace 1681 | compound_statement_lbrace block_item_list compound_statement_rbrace 1682 ; 1683 1684 compound_statement_lbrace: 1685 T_LBRACE { 1686 block_level++; 1687 mem_block_level++; 1688 begin_declaration_level(AUTO); 1689 } 1690 ; 1691 1692 compound_statement_rbrace: 1693 T_RBRACE { 1694 end_declaration_level(); 1695 level_free_all(mem_block_level); 1696 mem_block_level--; 1697 block_level--; 1698 seen_fallthrough = false; 1699 } 1700 ; 1701 1702 block_item_list: /* C99 6.8.2 */ 1703 block_item 1704 | block_item_list block_item { 1705 if (!Sflag && $1 && !$2) 1706 /* declarations after statements is a C99 feature */ 1707 c99ism(327); 1708 $$ = $1 || $2; 1709 } 1710 ; 1711 1712 block_item: /* C99 6.8.2 */ 1713 declaration_or_error { 1714 $$ = false; 1715 restore_warning_flags(); 1716 } 1717 | statement { 1718 $$ = true; 1719 restore_warning_flags(); 1720 } 1721 ; 1722 1723 expression_statement: /* C99 6.8.3 */ 1724 expression T_SEMI { 1725 expr($1, false, false, false, false); 1726 seen_fallthrough = false; 1727 } 1728 | T_SEMI { 1729 check_statement_reachable(); 1730 seen_fallthrough = false; 1731 } 1732 ; 1733 1734 selection_statement: /* C99 6.8.4 */ 1735 if_without_else %prec T_THEN { 1736 save_warning_flags(); 1737 if2(); 1738 if3(false); 1739 } 1740 | if_without_else T_ELSE { 1741 save_warning_flags(); 1742 if2(); 1743 } statement { 1744 clear_warning_flags(); 1745 if3(true); 1746 } 1747 | if_without_else T_ELSE error { 1748 clear_warning_flags(); 1749 if3(false); 1750 } 1751 | switch_expr statement { 1752 clear_warning_flags(); 1753 switch2(); 1754 } 1755 | switch_expr error { 1756 clear_warning_flags(); 1757 switch2(); 1758 } 1759 ; 1760 1761 if_without_else: /* see C99 6.8.4 */ 1762 if_expr statement 1763 | if_expr error 1764 ; 1765 1766 if_expr: /* see C99 6.8.4 */ 1767 T_IF T_LPAREN expression T_RPAREN { 1768 if1($3); 1769 clear_warning_flags(); 1770 } 1771 ; 1772 1773 switch_expr: /* see C99 6.8.4 */ 1774 T_SWITCH T_LPAREN expression T_RPAREN { 1775 switch1($3); 1776 clear_warning_flags(); 1777 } 1778 ; 1779 1780 iteration_statement: /* C99 6.8.5 */ 1781 while_expr statement { 1782 clear_warning_flags(); 1783 while2(); 1784 } 1785 | while_expr error { 1786 clear_warning_flags(); 1787 while2(); 1788 } 1789 | do_statement do_while_expr { 1790 do2($2); 1791 seen_fallthrough = false; 1792 } 1793 | do error { 1794 clear_warning_flags(); 1795 do2(NULL); 1796 } 1797 | for_exprs statement { 1798 clear_warning_flags(); 1799 for2(); 1800 end_declaration_level(); 1801 block_level--; 1802 } 1803 | for_exprs error { 1804 clear_warning_flags(); 1805 for2(); 1806 end_declaration_level(); 1807 block_level--; 1808 } 1809 ; 1810 1811 while_expr: /* see C99 6.8.5 */ 1812 T_WHILE T_LPAREN expression T_RPAREN { 1813 while1($3); 1814 clear_warning_flags(); 1815 } 1816 ; 1817 1818 do_statement: /* see C99 6.8.5 */ 1819 do statement { 1820 clear_warning_flags(); 1821 } 1822 ; 1823 1824 do: /* see C99 6.8.5 */ 1825 T_DO { 1826 do1(); 1827 } 1828 ; 1829 1830 do_while_expr: /* see C99 6.8.5 */ 1831 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1832 $$ = $3; 1833 } 1834 ; 1835 1836 for_start: /* see C99 6.8.5 */ 1837 T_FOR T_LPAREN { 1838 begin_declaration_level(AUTO); 1839 block_level++; 1840 } 1841 ; 1842 1843 for_exprs: /* see C99 6.8.5 */ 1844 for_start 1845 begin_type_declaration_specifiers end_type 1846 notype_init_declarators T_SEMI 1847 expression_opt T_SEMI expression_opt T_RPAREN { 1848 /* variable declaration in for loop */ 1849 c99ism(325); 1850 for1(NULL, $6, $8); 1851 clear_warning_flags(); 1852 } 1853 | for_start 1854 expression_opt T_SEMI 1855 expression_opt T_SEMI 1856 expression_opt T_RPAREN { 1857 for1($2, $4, $6); 1858 clear_warning_flags(); 1859 } 1860 ; 1861 1862 jump_statement: /* C99 6.8.6 */ 1863 goto identifier T_SEMI { 1864 do_goto(getsym($2)); 1865 } 1866 | goto error T_SEMI { 1867 symtyp = FVFT; 1868 } 1869 | T_CONTINUE T_SEMI { 1870 do_continue(); 1871 } 1872 | T_BREAK T_SEMI { 1873 do_break(); 1874 } 1875 | T_RETURN sys T_SEMI { 1876 do_return($2, NULL); 1877 } 1878 | T_RETURN sys expression T_SEMI { 1879 do_return($2, $3); 1880 } 1881 ; 1882 1883 goto: /* see C99 6.8.6 */ 1884 T_GOTO { 1885 symtyp = FLABEL; 1886 } 1887 ; 1888 1889 asm_statement: /* GCC extension */ 1890 T_ASM T_LPAREN read_until_rparen T_SEMI { 1891 setasm(); 1892 } 1893 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1894 setasm(); 1895 } 1896 | T_ASM error 1897 ; 1898 1899 read_until_rparen: /* helper for 'asm_statement' */ 1900 /* empty */ { 1901 read_until_rparen(); 1902 } 1903 ; 1904 1905 translation_unit: /* C99 6.9 */ 1906 external_declaration 1907 | translation_unit external_declaration 1908 ; 1909 1910 external_declaration: /* C99 6.9 */ 1911 function_definition { 1912 global_clean_up_decl(false); 1913 clear_warning_flags(); 1914 } 1915 | top_level_declaration { 1916 global_clean_up_decl(false); 1917 clear_warning_flags(); 1918 } 1919 | asm_statement /* GCC extension */ 1920 | T_SEMI { /* GCC extension */ 1921 if (sflag) { 1922 /* empty declaration */ 1923 error(0); 1924 } else if (!tflag) { 1925 /* empty declaration */ 1926 warning(0); 1927 } 1928 } 1929 ; 1930 1931 /* 1932 * On the top level, lint allows several forms of declarations that it doesn't 1933 * allow in functions. For example, a single ';' is an empty declaration and 1934 * is supported by some compilers, but in a function it would be an empty 1935 * statement, not a declaration. This makes a difference in C90 mode, where 1936 * a statement must not be followed by a declaration. 1937 * 1938 * See 'declaration' for all other declarations. 1939 */ 1940 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1941 begin_type end_type notype_init_declarators T_SEMI { 1942 if (sflag) { 1943 /* old style declaration; add 'int' */ 1944 error(1); 1945 } else if (!tflag) { 1946 /* old style declaration; add 'int' */ 1947 warning(1); 1948 } 1949 } 1950 | declaration 1951 | error T_SEMI { 1952 global_clean_up(); 1953 } 1954 | error T_RBRACE { 1955 global_clean_up(); 1956 } 1957 ; 1958 1959 function_definition: /* C99 6.9.1 */ 1960 func_declarator { 1961 if ($1->s_type->t_tspec != FUNC) { 1962 /* syntax error '%s' */ 1963 error(249, yytext); 1964 YYERROR; 1965 } 1966 if ($1->s_type->t_typedef) { 1967 /* ()-less function definition */ 1968 error(64); 1969 YYERROR; 1970 } 1971 funcdef($1); 1972 block_level++; 1973 begin_declaration_level(OLD_STYLE_ARG); 1974 if (lwarn == LWARN_NONE) 1975 $1->s_used = true; 1976 } arg_declaration_list_opt { 1977 end_declaration_level(); 1978 block_level--; 1979 check_func_lint_directives(); 1980 check_func_old_style_arguments(); 1981 begin_control_statement(CS_FUNCTION_BODY); 1982 } compound_statement { 1983 funcend(); 1984 end_control_statement(CS_FUNCTION_BODY); 1985 } 1986 ; 1987 1988 func_declarator: 1989 begin_type end_type notype_declarator { 1990 /* ^^ There is no check for the missing type-specifier. */ 1991 $$ = $3; 1992 } 1993 | begin_type_declmods end_type notype_declarator { 1994 /* ^^ There is no check for the missing type-specifier. */ 1995 $$ = $3; 1996 } 1997 | begin_type_declaration_specifiers end_type type_declarator { 1998 $$ = $3; 1999 } 2000 ; 2001 2002 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2003 /* empty */ 2004 | arg_declaration_list 2005 ; 2006 2007 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2008 arg_declaration 2009 | arg_declaration_list arg_declaration 2010 /* XXX or better "arg_declaration error" ? */ 2011 | error 2012 ; 2013 2014 /* 2015 * "arg_declaration" is separated from "declaration" because it 2016 * needs other error handling. 2017 */ 2018 arg_declaration: 2019 begin_type_declmods end_type T_SEMI { 2020 /* empty declaration */ 2021 warning(2); 2022 } 2023 | begin_type_declmods end_type notype_init_declarators T_SEMI 2024 | begin_type_declaration_specifiers end_type T_SEMI { 2025 if (!dcs->d_nonempty_decl) { 2026 /* empty declaration */ 2027 warning(2); 2028 } else { 2029 /* '%s' declared in argument declaration list */ 2030 warning(3, type_name(dcs->d_type)); 2031 } 2032 } 2033 | begin_type_declaration_specifiers end_type 2034 type_init_declarators T_SEMI { 2035 if (dcs->d_nonempty_decl) { 2036 /* '%s' declared in argument declaration list */ 2037 warning(3, type_name(dcs->d_type)); 2038 } 2039 } 2040 | begin_type_declmods error 2041 | begin_type_declaration_specifiers error 2042 ; 2043 2044 gcc_attribute_list_opt: 2045 /* empty */ 2046 | gcc_attribute_list 2047 ; 2048 2049 gcc_attribute_list: 2050 gcc_attribute 2051 | gcc_attribute_list gcc_attribute 2052 ; 2053 2054 gcc_attribute: 2055 T_ATTRIBUTE T_LPAREN T_LPAREN { 2056 in_gcc_attribute = true; 2057 } gcc_attribute_spec_list { 2058 in_gcc_attribute = false; 2059 } T_RPAREN T_RPAREN 2060 ; 2061 2062 gcc_attribute_spec_list: 2063 gcc_attribute_spec 2064 | gcc_attribute_spec_list T_COMMA gcc_attribute_spec 2065 ; 2066 2067 gcc_attribute_spec: 2068 /* empty */ 2069 | T_AT_ALWAYS_INLINE 2070 | T_AT_ALIAS T_LPAREN string T_RPAREN 2071 | T_AT_ALIGNED T_LPAREN constant_expr T_RPAREN 2072 | T_AT_ALIGNED 2073 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_COMMA constant_expr T_RPAREN 2074 | T_AT_ALLOC_SIZE T_LPAREN constant_expr T_RPAREN 2075 | T_AT_BOUNDED T_LPAREN gcc_attribute_bounded 2076 T_COMMA constant_expr T_COMMA constant_expr T_RPAREN 2077 | T_AT_COLD 2078 | T_AT_COMMON 2079 | T_AT_CONSTRUCTOR T_LPAREN constant_expr T_RPAREN 2080 | T_AT_CONSTRUCTOR 2081 | T_AT_DEPRECATED T_LPAREN string T_RPAREN 2082 | T_AT_DEPRECATED 2083 | T_AT_DESTRUCTOR T_LPAREN constant_expr T_RPAREN 2084 | T_AT_DESTRUCTOR 2085 | T_AT_DISABLE_SANITIZER_INSTRUMENTATION 2086 | T_AT_FALLTHROUGH { 2087 fallthru(1); 2088 } 2089 | T_AT_FORMAT T_LPAREN gcc_attribute_format T_COMMA 2090 constant_expr T_COMMA constant_expr T_RPAREN 2091 | T_AT_FORMAT_ARG T_LPAREN constant_expr T_RPAREN 2092 | T_AT_GNU_INLINE 2093 | T_AT_HOT 2094 | T_AT_MALLOC 2095 | T_AT_MAY_ALIAS 2096 | T_AT_MODE T_LPAREN T_NAME T_RPAREN 2097 | T_AT_NO_SANITIZE T_LPAREN T_NAME T_RPAREN 2098 | T_AT_NO_SANITIZE_THREAD 2099 | T_AT_NOINLINE 2100 | T_AT_NONNULL T_LPAREN constant_expr_list_opt T_RPAREN 2101 | T_AT_NONNULL 2102 | T_AT_NONSTRING 2103 | T_AT_NORETURN 2104 | T_AT_NOTHROW 2105 | T_AT_NO_INSTRUMENT_FUNCTION 2106 | T_AT_OPTIMIZE T_LPAREN string T_RPAREN 2107 | T_AT_OPTNONE 2108 | T_AT_PACKED { 2109 addpacked(); 2110 } 2111 | T_AT_PCS T_LPAREN string T_RPAREN 2112 | T_AT_PURE 2113 | T_AT_REGPARM T_LPAREN constant_expr T_RPAREN 2114 | T_AT_RETURNS_NONNULL 2115 | T_AT_RETURNS_TWICE 2116 | T_AT_SECTION T_LPAREN string T_RPAREN 2117 | T_AT_SENTINEL T_LPAREN constant_expr T_RPAREN 2118 | T_AT_SENTINEL 2119 | T_AT_TARGET T_LPAREN string T_RPAREN 2120 | T_AT_TLS_MODEL T_LPAREN string T_RPAREN 2121 | T_AT_TUNION 2122 | T_AT_UNUSED { 2123 add_attr_used(); 2124 } 2125 | T_AT_USED { 2126 add_attr_used(); 2127 } 2128 | T_AT_VISIBILITY T_LPAREN constant_expr T_RPAREN 2129 | T_AT_WARN_UNUSED_RESULT 2130 | T_AT_WEAK 2131 | T_QUAL { 2132 if ($1 != CONST) 2133 yyerror("Bad attribute"); 2134 } 2135 ; 2136 2137 gcc_attribute_bounded: 2138 T_AT_MINBYTES 2139 | T_AT_STRING 2140 | T_AT_BUFFER 2141 ; 2142 2143 gcc_attribute_format: 2144 T_AT_FORMAT_GNU_PRINTF 2145 | T_AT_FORMAT_PRINTF 2146 | T_AT_FORMAT_SCANF 2147 | T_AT_FORMAT_STRFMON 2148 | T_AT_FORMAT_STRFTIME 2149 | T_AT_FORMAT_SYSLOG 2150 ; 2151 2152 sys: 2153 /* empty */ { 2154 $$ = in_system_header; 2155 } 2156 ; 2157 2158 %% 2159 2160 /* ARGSUSED */ 2161 int 2162 yyerror(const char *msg) 2163 { 2164 /* syntax error '%s' */ 2165 error(249, yytext); 2166 if (++sytxerr >= 5) 2167 norecover(); 2168 return 0; 2169 } 2170 2171 #if (defined(YYDEBUG) && YYDEBUG > 0 && defined(YYBYACC)) \ 2172 || (defined(YYDEBUG) && defined(YYBISON)) 2173 static const char * 2174 cgram_to_string(int token, YYSTYPE val) 2175 { 2176 static const char *tqual_name[] = { 2177 "const", "volatile", "restrict", "_Thread_local" 2178 }; 2179 2180 switch (token) { 2181 case T_INCDEC: 2182 case T_MULTIPLICATIVE: 2183 case T_ADDITIVE: 2184 case T_SHIFT: 2185 case T_RELATIONAL: 2186 case T_EQUALITY: 2187 case T_OPASSIGN: 2188 return modtab[val.y_op].m_name; 2189 case T_SCLASS: 2190 return scl_name(val.y_scl); 2191 case T_TYPE: 2192 case T_STRUCT_OR_UNION: 2193 return tspec_name(val.y_tspec); 2194 case T_QUAL: 2195 return tqual_name[val.y_tqual]; 2196 case T_NAME: 2197 return val.y_name->sb_name; 2198 default: 2199 return "<none>"; 2200 } 2201 } 2202 #endif 2203 2204 #if defined(YYDEBUG) && defined(YYBISON) 2205 static inline void 2206 cgram_print(FILE *output, int token, YYSTYPE val) 2207 { 2208 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2209 } 2210 #endif 2211 2212 static void 2213 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2214 { 2215 declare(decl, initflg, renaming); 2216 if (renaming != NULL) 2217 freeyyv(&renaming, T_NAME); 2218 } 2219 2220 /* 2221 * Discard all input tokens up to and including the next 2222 * unmatched right paren 2223 */ 2224 static void 2225 read_until_rparen(void) 2226 { 2227 int level; 2228 2229 if (yychar < 0) 2230 yychar = yylex(); 2231 freeyyv(&yylval, yychar); 2232 2233 level = 1; 2234 while (yychar != T_RPAREN || --level > 0) { 2235 if (yychar == T_LPAREN) { 2236 level++; 2237 } else if (yychar <= 0) { 2238 break; 2239 } 2240 freeyyv(&yylval, yychar = yylex()); 2241 } 2242 2243 yyclearin; 2244 } 2245 2246 static sym_t * 2247 symbolrename(sym_t *s, sbuf_t *sb) 2248 { 2249 if (sb != NULL) 2250 s->s_rename = sb->sb_name; 2251 return s; 2252 } 2253
Indexes created Thu Oct 02 14:10:14 GMT 2025