cgram.y revision 1.445
1 %{ 2 /* $NetBSD: cgram.y,v 1.445 2023/07/02 22:56:13 rillig Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. 6 * Copyright (c) 1994, 1995 Jochen Pohl 7 * All Rights Reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Jochen Pohl for 20 * The NetBSD Project. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) 38 __RCSID("$NetBSD: cgram.y,v 1.445 2023/07/02 22:56:13 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 /* 89 * There used to be an assertion that saved_lwarn is 90 * LWARN_NOTHING_SAVED here, but that triggered for the following 91 * code: 92 * 93 * void function(int x) { if (x > 0) if (x > 1) return; } 94 * 95 * It didn't trigger if the inner 'if' was enclosed in braces though. 96 * 97 * TODO: If actually needed, add support for nested suppression of 98 * warnings. 99 */ 100 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 101 saved_lwarn = lwarn; 102 } 103 104 /* ARGSUSED */ 105 static void 106 restore_warning_flags_loc(const char *file, size_t line) 107 { 108 if (saved_lwarn != LWARN_NOTHING_SAVED) { 109 lwarn = saved_lwarn; 110 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 111 /* 112 * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to 113 * avoid triggering the assertion in save_warning_flags_loc. 114 */ 115 } else 116 clear_warning_flags_loc(file, line); 117 } 118 119 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 120 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 121 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 122 123 static bool 124 is_either(const char *s, const char *a, const char *b) 125 { 126 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 127 } 128 129 #if YYDEBUG && (YYBYACC || YYBISON) 130 #define YYSTYPE_TOSTRING cgram_to_string 131 #endif 132 #if YYDEBUG && YYBISON 133 #define YYPRINT cgram_print 134 #endif 135 136 %} 137 138 %expect 131 139 140 %union { 141 val_t *y_val; 142 sbuf_t *y_name; 143 sym_t *y_sym; 144 op_t y_op; 145 scl_t y_scl; 146 tspec_t y_tspec; 147 tqual_t y_tqual; 148 type_t *y_type; 149 tnode_t *y_tnode; 150 range_t y_range; 151 strg_t *y_string; 152 qual_ptr *y_qual_ptr; 153 bool y_seen_statement; 154 struct generic_association *y_generic; 155 struct array_size y_array_size; 156 bool y_in_system_header; 157 }; 158 159 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 160 %token T_POINT T_ARROW 161 %token T_COMPLEMENT T_LOGNOT 162 %token <y_op> T_INCDEC 163 %token T_SIZEOF 164 %token T_BUILTIN_OFFSETOF 165 %token T_TYPEOF 166 %token T_EXTENSION 167 %token T_ALIGNAS 168 %token T_ALIGNOF 169 %token T_ASTERISK 170 %token <y_op> T_MULTIPLICATIVE 171 %token <y_op> T_ADDITIVE 172 %token <y_op> T_SHIFT 173 %token <y_op> T_RELATIONAL 174 %token <y_op> T_EQUALITY 175 %token T_AMPER 176 %token T_BITXOR 177 %token T_BITOR 178 %token T_LOGAND 179 %token T_LOGOR 180 %token T_QUEST 181 %token T_COLON 182 %token T_ASSIGN 183 %token <y_op> T_OPASSIGN 184 %token T_COMMA 185 %token T_SEMI 186 %token T_ELLIPSIS 187 %token T_REAL 188 %token T_IMAG 189 %token T_GENERIC 190 %token T_NORETURN 191 192 /* storage classes (extern, static, auto, register and typedef) */ 193 %token <y_scl> T_SCLASS 194 195 /* 196 * predefined type keywords (char, int, short, long, unsigned, signed, 197 * float, double, void); see T_TYPENAME for types from typedef 198 */ 199 %token <y_tspec> T_TYPE 200 201 /* qualifiers (const, volatile, restrict, _Thread_local) */ 202 %token <y_tqual> T_QUAL 203 %token <y_tqual> T_ATOMIC 204 205 /* struct or union */ 206 %token <y_tspec> T_STRUCT_OR_UNION 207 208 /* remaining keywords */ 209 %token T_ASM 210 %token T_BREAK 211 %token T_CASE 212 %token T_CONTINUE 213 %token T_DEFAULT 214 %token T_DO 215 %token T_ELSE 216 %token T_ENUM 217 %token T_FOR 218 %token T_GOTO 219 %token T_IF 220 %token T_PACKED 221 %token T_RETURN 222 %token T_SWITCH 223 %token T_SYMBOLRENAME 224 %token T_WHILE 225 %token T_STATIC_ASSERT 226 227 %token T_ATTRIBUTE 228 229 %left T_THEN 230 %left T_ELSE 231 %right T_QUEST T_COLON 232 %left T_LOGOR 233 %left T_LOGAND 234 %left T_BITOR 235 %left T_BITXOR 236 %left T_AMPER 237 %left T_EQUALITY 238 %left T_RELATIONAL 239 %left T_SHIFT 240 %left T_ADDITIVE 241 %left T_ASTERISK T_MULTIPLICATIVE 242 243 %token <y_name> T_NAME 244 %token <y_name> T_TYPENAME 245 %token <y_val> T_CON 246 %token <y_string> T_STRING 247 248 %type <y_sym> identifier_sym 249 %type <y_name> identifier 250 %type <y_string> string 251 252 %type <y_tnode> primary_expression 253 %type <y_tnode> generic_selection 254 %type <y_generic> generic_assoc_list 255 %type <y_generic> generic_association 256 %type <y_tnode> postfix_expression 257 %type <y_tnode> gcc_statement_expr_list 258 %type <y_tnode> gcc_statement_expr_item 259 %type <y_op> point_or_arrow 260 %type <y_tnode> argument_expression_list 261 %type <y_tnode> unary_expression 262 %type <y_tnode> cast_expression 263 %type <y_tnode> conditional_expression 264 %type <y_tnode> assignment_expression 265 %type <y_tnode> expression_opt 266 %type <y_tnode> expression 267 %type <y_tnode> constant_expr 268 269 %type <y_type> begin_type_typespec 270 %type <y_type> type_specifier 271 %type <y_type> notype_type_specifier 272 %type <y_type> atomic_type_specifier 273 %type <y_type> struct_or_union_specifier 274 %type <y_tspec> struct_or_union 275 %type <y_sym> braced_struct_declaration_list 276 %type <y_sym> struct_declaration_list_with_rbrace 277 %type <y_sym> struct_declaration_list 278 %type <y_sym> struct_declaration 279 %type <y_sym> notype_struct_declarators 280 %type <y_sym> type_struct_declarators 281 %type <y_sym> notype_struct_declarator 282 %type <y_sym> type_struct_declarator 283 %type <y_type> enum_specifier 284 %type <y_sym> enum_declaration 285 %type <y_sym> enums_with_opt_comma 286 %type <y_sym> enumerator_list 287 %type <y_sym> enumerator 288 %type <y_tqual> type_qualifier 289 %type <y_qual_ptr> pointer 290 %type <y_qual_ptr> asterisk 291 %type <y_qual_ptr> type_qualifier_list_opt 292 %type <y_qual_ptr> type_qualifier_list 293 %type <y_qual_ptr> type_qualifier_list_elem 294 %type <y_sym> notype_declarator 295 %type <y_sym> type_declarator 296 %type <y_sym> notype_direct_declarator 297 %type <y_sym> type_direct_declarator 298 %type <y_sym> type_param_declarator 299 %type <y_sym> notype_param_declarator 300 %type <y_sym> direct_param_declarator 301 %type <y_sym> direct_notype_param_declarator 302 %type <y_sym> param_list 303 %type <y_array_size> array_size_opt 304 %type <y_tnode> array_size 305 %type <y_sym> identifier_list 306 %type <y_type> type_name 307 %type <y_sym> abstract_declaration 308 %type <y_sym> abstract_declarator 309 %type <y_sym> direct_abstract_declarator 310 %type <y_sym> abstract_decl_param_list 311 %type <y_sym> vararg_parameter_type_list 312 %type <y_sym> parameter_type_list 313 %type <y_sym> parameter_declaration 314 %type <y_range> range 315 %type <y_name> asm_or_symbolrename_opt 316 317 %type <y_seen_statement> block_item_list 318 %type <y_seen_statement> block_item 319 %type <y_tnode> do_while_expr 320 %type <y_sym> func_declarator 321 %type <y_in_system_header> sys 322 323 %{ 324 #if YYDEBUG && YYBISON 325 static inline void cgram_print(FILE *, int, YYSTYPE); 326 #endif 327 %} 328 329 %% 330 331 program: 332 /* empty */ { 333 /* TODO: Make this an error in C99 mode as well. */ 334 if (!allow_trad && !allow_c99) { 335 /* empty translation unit */ 336 error(272); 337 } else if (allow_c90) { 338 /* empty translation unit */ 339 warning(272); 340 } 341 } 342 | translation_unit 343 ; 344 345 identifier_sym: /* helper for struct/union/enum */ 346 identifier { 347 $$ = getsym($1); 348 } 349 ; 350 351 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 352 identifier: 353 T_NAME { 354 debug_step("cgram: name '%s'", $1->sb_name); 355 $$ = $1; 356 } 357 | T_TYPENAME { 358 debug_step("cgram: typename '%s'", $1->sb_name); 359 $$ = $1; 360 } 361 ; 362 363 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 364 string: 365 T_STRING 366 | string T_STRING { 367 if (!allow_c90) { 368 /* concatenated strings are illegal in traditional C */ 369 warning(219); 370 } 371 $$ = cat_strings($1, $2); 372 } 373 ; 374 375 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 376 primary_expression: 377 T_NAME { 378 bool sys_name, sys_next; 379 sys_name = in_system_header; 380 if (yychar < 0) 381 yychar = yylex(); 382 sys_next = in_system_header; 383 in_system_header = sys_name; 384 $$ = build_name(getsym($1), yychar == T_LPAREN); 385 in_system_header = sys_next; 386 } 387 | T_CON { 388 $$ = build_constant(gettyp($1->v_tspec), $1); 389 } 390 | string { 391 $$ = build_string($1); 392 } 393 | T_LPAREN expression T_RPAREN { 394 if ($2 != NULL) 395 $2->tn_parenthesized = true; 396 $$ = $2; 397 } 398 | generic_selection 399 /* GCC primary-expression, see c_parser_postfix_expression */ 400 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 401 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 402 symtyp = FMEMBER; 403 $$ = build_offsetof($3, getsym($5)); 404 } 405 ; 406 407 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 408 generic_selection: 409 T_GENERIC T_LPAREN assignment_expression T_COMMA 410 generic_assoc_list T_RPAREN { 411 /* generic selection requires C11 or later */ 412 c11ism(345); 413 $$ = build_generic_selection($3, $5); 414 } 415 ; 416 417 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 418 generic_assoc_list: 419 generic_association 420 | generic_assoc_list T_COMMA generic_association { 421 $3->ga_prev = $1; 422 $$ = $3; 423 } 424 ; 425 426 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 427 generic_association: 428 type_name T_COLON assignment_expression { 429 $$ = block_zero_alloc(sizeof(*$$)); 430 $$->ga_arg = $1; 431 $$->ga_result = $3; 432 } 433 | T_DEFAULT T_COLON assignment_expression { 434 $$ = block_zero_alloc(sizeof(*$$)); 435 $$->ga_arg = NULL; 436 $$->ga_result = $3; 437 } 438 ; 439 440 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 441 postfix_expression: 442 primary_expression 443 | postfix_expression T_LBRACK sys expression T_RBRACK { 444 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 445 } 446 | postfix_expression T_LPAREN sys T_RPAREN { 447 $$ = build_function_call($1, $3, NULL); 448 } 449 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 450 $$ = build_function_call($1, $3, $4); 451 } 452 | postfix_expression point_or_arrow sys T_NAME { 453 $$ = build_member_access($1, $2, $3, $4); 454 } 455 | postfix_expression T_INCDEC sys { 456 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 457 } 458 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 459 sym_t *tmp = mktempsym($2); 460 begin_initialization(tmp); 461 cgram_declare(tmp, true, NULL); 462 } init_lbrace initializer_list comma_opt init_rbrace { 463 if (!allow_c99) 464 /* compound literals are a C99/GCC extension */ 465 gnuism(319); 466 $$ = build_name(current_initsym(), false); 467 end_initialization(); 468 } 469 | T_LPAREN compound_statement_lbrace { 470 begin_statement_expr(); 471 } gcc_statement_expr_list { 472 do_statement_expr($4); 473 } compound_statement_rbrace T_RPAREN { 474 $$ = end_statement_expr(); 475 } 476 ; 477 478 comma_opt: /* helper for 'postfix_expression' */ 479 /* empty */ 480 | T_COMMA 481 ; 482 483 /* 484 * The inner part of a GCC statement-expression of the form ({ ... }). 485 * 486 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 487 */ 488 gcc_statement_expr_list: 489 gcc_statement_expr_item 490 | gcc_statement_expr_list gcc_statement_expr_item { 491 $$ = $2; 492 } 493 ; 494 495 gcc_statement_expr_item: 496 declaration_or_error { 497 clear_warning_flags(); 498 $$ = NULL; 499 } 500 | non_expr_statement { 501 $$ = expr_alloc_tnode(); 502 $$->tn_type = gettyp(VOID); 503 } 504 | T_SEMI { 505 $$ = expr_alloc_tnode(); 506 $$->tn_type = gettyp(VOID); 507 } 508 | expression T_SEMI { 509 if ($1 == NULL) { /* in case of syntax errors */ 510 $$ = expr_alloc_tnode(); 511 $$->tn_type = gettyp(VOID); 512 } else { 513 /* XXX: do that only on the last name */ 514 if ($1->tn_op == NAME) 515 $1->tn_sym->s_used = true; 516 expr($1, false, false, false, false); 517 seen_fallthrough = false; 518 $$ = $1; 519 } 520 } 521 ; 522 523 point_or_arrow: /* helper for 'postfix_expression' */ 524 T_POINT { 525 symtyp = FMEMBER; 526 $$ = POINT; 527 } 528 | T_ARROW { 529 symtyp = FMEMBER; 530 $$ = ARROW; 531 } 532 ; 533 534 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 535 argument_expression_list: 536 assignment_expression { 537 $$ = build_function_argument(NULL, $1); 538 } 539 | argument_expression_list T_COMMA assignment_expression { 540 $$ = build_function_argument($1, $3); 541 } 542 ; 543 544 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 545 unary_expression: 546 postfix_expression 547 | T_INCDEC sys unary_expression { 548 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 549 } 550 | T_AMPER sys cast_expression { 551 $$ = build_unary(ADDR, $2, $3); 552 } 553 | T_ASTERISK sys cast_expression { 554 $$ = build_unary(INDIR, $2, $3); 555 } 556 | T_ADDITIVE sys cast_expression { 557 if (!allow_c90 && $1 == PLUS) { 558 /* unary '+' is illegal in traditional C */ 559 warning(100); 560 } 561 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 562 } 563 | T_COMPLEMENT sys cast_expression { 564 $$ = build_unary(COMPL, $2, $3); 565 } 566 | T_LOGNOT sys cast_expression { 567 $$ = build_unary(NOT, $2, $3); 568 } 569 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 570 $$ = build_unary(REAL, $2, $3); 571 } 572 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 573 $$ = build_unary(IMAG, $2, $3); 574 } 575 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 576 $$ = $2; 577 } 578 | T_SIZEOF unary_expression { 579 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 580 if ($$ != NULL) 581 check_expr_misc($2, 582 false, false, false, false, false, true); 583 } 584 | T_SIZEOF T_LPAREN type_name T_RPAREN { 585 $$ = build_sizeof($3); 586 } 587 | T_ALIGNOF unary_expression { 588 /* non type argument to alignof is a GCC extension */ 589 gnuism(349); 590 lint_assert($2 != NULL); 591 $$ = build_alignof($2->tn_type); 592 } 593 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 594 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 595 /* TODO: c11ism */ 596 $$ = build_alignof($3); 597 } 598 ; 599 600 /* The rule 'unary_operator' is inlined into unary_expression. */ 601 602 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 603 cast_expression: 604 unary_expression 605 | T_LPAREN type_name T_RPAREN cast_expression { 606 $$ = cast($4, $2); 607 } 608 ; 609 610 expression_opt: 611 /* empty */ { 612 $$ = NULL; 613 } 614 | expression 615 ; 616 617 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 618 /* 'conditional_expression' also implements 'additive_expression'. */ 619 /* 'conditional_expression' also implements 'shift_expression'. */ 620 /* 'conditional_expression' also implements 'relational_expression'. */ 621 /* 'conditional_expression' also implements 'equality_expression'. */ 622 /* 'conditional_expression' also implements 'AND_expression'. */ 623 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 624 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 625 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 626 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 627 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 628 conditional_expression: 629 cast_expression 630 | conditional_expression T_ASTERISK sys conditional_expression { 631 $$ = build_binary($1, MULT, $3, $4); 632 } 633 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 634 $$ = build_binary($1, $2, $3, $4); 635 } 636 | conditional_expression T_ADDITIVE sys conditional_expression { 637 $$ = build_binary($1, $2, $3, $4); 638 } 639 | conditional_expression T_SHIFT sys conditional_expression { 640 $$ = build_binary($1, $2, $3, $4); 641 } 642 | conditional_expression T_RELATIONAL sys conditional_expression { 643 $$ = build_binary($1, $2, $3, $4); 644 } 645 | conditional_expression T_EQUALITY sys conditional_expression { 646 $$ = build_binary($1, $2, $3, $4); 647 } 648 | conditional_expression T_AMPER sys conditional_expression { 649 $$ = build_binary($1, BITAND, $3, $4); 650 } 651 | conditional_expression T_BITXOR sys conditional_expression { 652 $$ = build_binary($1, BITXOR, $3, $4); 653 } 654 | conditional_expression T_BITOR sys conditional_expression { 655 $$ = build_binary($1, BITOR, $3, $4); 656 } 657 | conditional_expression T_LOGAND sys conditional_expression { 658 $$ = build_binary($1, LOGAND, $3, $4); 659 } 660 | conditional_expression T_LOGOR sys conditional_expression { 661 $$ = build_binary($1, LOGOR, $3, $4); 662 } 663 | conditional_expression T_QUEST sys 664 expression T_COLON sys conditional_expression { 665 $$ = build_binary($1, QUEST, $3, 666 build_binary($4, COLON, $6, $7)); 667 } 668 ; 669 670 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 671 assignment_expression: 672 conditional_expression 673 | unary_expression T_ASSIGN sys assignment_expression { 674 $$ = build_binary($1, ASSIGN, $3, $4); 675 } 676 | unary_expression T_OPASSIGN sys assignment_expression { 677 $$ = build_binary($1, $2, $3, $4); 678 } 679 ; 680 681 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 682 expression: 683 assignment_expression 684 | expression T_COMMA sys assignment_expression { 685 $$ = build_binary($1, COMMA, $3, $4); 686 } 687 ; 688 689 constant_expr: /* C99 6.6 */ 690 conditional_expression 691 ; 692 693 declaration_or_error: 694 declaration 695 | error T_SEMI 696 ; 697 698 declaration: /* C99 6.7 */ 699 begin_type_declmods end_type T_SEMI { 700 if (dcs->d_scl == TYPEDEF) { 701 /* typedef declares no type name */ 702 warning(72); 703 } else { 704 /* empty declaration */ 705 warning(2); 706 } 707 } 708 | begin_type_declmods end_type notype_init_declarators T_SEMI { 709 if (dcs->d_scl == TYPEDEF) { 710 /* syntax error '%s' */ 711 error(249, "missing base type for typedef"); 712 } else { 713 /* old-style declaration; add 'int' */ 714 error(1); 715 } 716 } 717 | begin_type_declaration_specifiers end_type T_SEMI { 718 if (dcs->d_scl == TYPEDEF) { 719 /* typedef declares no type name */ 720 warning(72); 721 } else if (!dcs->d_nonempty_decl) { 722 /* empty declaration */ 723 warning(2); 724 } 725 } 726 | begin_type_declaration_specifiers end_type 727 type_init_declarators T_SEMI 728 | static_assert_declaration 729 ; 730 731 begin_type_declaration_specifiers: /* see C99 6.7 */ 732 begin_type_typespec { 733 dcs_add_type($1); 734 } 735 | begin_type_declmods type_specifier { 736 dcs_add_type($2); 737 } 738 | type_attribute begin_type_declaration_specifiers 739 | begin_type_declaration_specifiers declmod 740 | begin_type_declaration_specifiers notype_type_specifier { 741 dcs_add_type($2); 742 } 743 ; 744 745 begin_type_declmods: /* see C99 6.7 */ 746 begin_type type_qualifier { 747 dcs_add_qualifier($2); 748 } 749 | begin_type T_SCLASS { 750 dcs_add_storage_class($2); 751 } 752 | begin_type_declmods declmod 753 ; 754 755 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 756 begin_type_specifier_qualifier_list_postfix 757 | type_attribute_list begin_type_specifier_qualifier_list_postfix 758 ; 759 760 begin_type_specifier_qualifier_list_postfix: 761 begin_type_typespec { 762 dcs_add_type($1); 763 } 764 | begin_type_qualifier_list type_specifier { 765 dcs_add_type($2); 766 } 767 | begin_type_specifier_qualifier_list_postfix type_qualifier { 768 dcs_add_qualifier($2); 769 } 770 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 771 dcs_add_type($2); 772 } 773 | begin_type_specifier_qualifier_list_postfix type_attribute 774 ; 775 776 begin_type_typespec: 777 begin_type notype_type_specifier { 778 $$ = $2; 779 } 780 | begin_type T_TYPENAME { 781 $$ = getsym($2)->s_type; 782 } 783 ; 784 785 begin_type_qualifier_list: 786 begin_type type_qualifier { 787 dcs_add_qualifier($2); 788 } 789 | begin_type_qualifier_list type_qualifier { 790 dcs_add_qualifier($2); 791 } 792 ; 793 794 declmod: 795 type_qualifier { 796 dcs_add_qualifier($1); 797 } 798 | T_SCLASS { 799 dcs_add_storage_class($1); 800 } 801 | type_attribute_list 802 ; 803 804 type_attribute_list_opt: 805 /* empty */ 806 | type_attribute_list 807 ; 808 809 type_attribute_list: 810 type_attribute 811 | type_attribute_list type_attribute 812 ; 813 814 type_attribute_opt: 815 /* empty */ 816 | type_attribute 817 ; 818 819 type_attribute: /* See C11 6.7 declaration-specifiers */ 820 gcc_attribute_specifier 821 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 822 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 823 | T_PACKED { 824 dcs_add_packed(); 825 } 826 | T_NORETURN 827 ; 828 829 begin_type: 830 /* empty */ { 831 dcs_begin_type(); 832 } 833 ; 834 835 end_type: 836 /* empty */ { 837 dcs_end_type(); 838 } 839 ; 840 841 type_specifier: /* C99 6.7.2 */ 842 notype_type_specifier 843 | T_TYPENAME { 844 $$ = getsym($1)->s_type; 845 } 846 ; 847 848 notype_type_specifier: /* see C99 6.7.2 */ 849 T_TYPE { 850 $$ = gettyp($1); 851 } 852 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 853 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 854 $$->t_typeof = true; 855 } 856 | atomic_type_specifier 857 | struct_or_union_specifier { 858 end_declaration_level(); 859 $$ = $1; 860 } 861 | enum_specifier { 862 end_declaration_level(); 863 $$ = $1; 864 } 865 ; 866 867 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 868 atomic_type_specifier: 869 atomic T_LPAREN type_name T_RPAREN { 870 $$ = $3; 871 } 872 ; 873 874 struct_or_union_specifier: /* C99 6.7.2.1 */ 875 struct_or_union identifier_sym { 876 /* 877 * STDC requires that "struct a;" always introduces 878 * a new tag if "a" is not declared at current level 879 * 880 * yychar is valid because otherwise the parser would not 881 * have been able to decide if it must shift or reduce 882 */ 883 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 884 } 885 | struct_or_union identifier_sym { 886 dcs->d_tag_type = make_tag_type($2, $1, true, false); 887 } braced_struct_declaration_list { 888 $$ = complete_struct_or_union($4); 889 } 890 | struct_or_union { 891 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 892 } braced_struct_declaration_list { 893 $$ = complete_struct_or_union($3); 894 } 895 | struct_or_union error { 896 symtyp = FVFT; 897 $$ = gettyp(INT); 898 } 899 ; 900 901 struct_or_union: /* C99 6.7.2.1 */ 902 T_STRUCT_OR_UNION { 903 symtyp = FTAG; 904 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 905 dcs->d_sou_size_in_bits = 0; 906 dcs->d_sou_align_in_bits = CHAR_SIZE; 907 $$ = $1; 908 } 909 | struct_or_union type_attribute 910 ; 911 912 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 913 struct_declaration_lbrace struct_declaration_list_with_rbrace { 914 $$ = $2; 915 } 916 ; 917 918 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 919 T_LBRACE { 920 symtyp = FVFT; 921 } 922 ; 923 924 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 925 struct_declaration_list T_RBRACE 926 | T_RBRACE { 927 /* XXX: This is not allowed by any C standard. */ 928 $$ = NULL; 929 } 930 ; 931 932 struct_declaration_list: /* C99 6.7.2.1 */ 933 struct_declaration 934 | struct_declaration_list struct_declaration { 935 $$ = concat_symbols($1, $2); 936 } 937 ; 938 939 struct_declaration: /* C99 6.7.2.1 */ 940 begin_type_qualifier_list end_type { 941 /* ^^ There is no check for the missing type-specifier. */ 942 /* too late, i know, but getsym() compensates it */ 943 symtyp = FMEMBER; 944 } notype_struct_declarators type_attribute_opt T_SEMI { 945 symtyp = FVFT; 946 $$ = $4; 947 } 948 | begin_type_specifier_qualifier_list end_type { 949 symtyp = FMEMBER; 950 } type_struct_declarators type_attribute_opt T_SEMI { 951 symtyp = FVFT; 952 $$ = $4; 953 } 954 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 955 /* syntax error '%s' */ 956 error(249, "member without type"); 957 $$ = NULL; 958 } 959 | begin_type_specifier_qualifier_list end_type type_attribute_opt 960 T_SEMI { 961 symtyp = FVFT; 962 if (!allow_c11 && !allow_gcc) 963 /* anonymous struct/union members is a C11 feature */ 964 warning(49); 965 if (is_struct_or_union(dcs->d_type->t_tspec)) 966 $$ = declare_unnamed_member(); 967 else { 968 /* syntax error '%s' */ 969 error(249, "unnamed member"); 970 $$ = NULL; 971 } 972 } 973 | static_assert_declaration { 974 $$ = NULL; 975 } 976 | error T_SEMI { 977 symtyp = FVFT; 978 $$ = NULL; 979 } 980 ; 981 982 notype_struct_declarators: 983 notype_struct_declarator { 984 $$ = declare_member($1); 985 } 986 | notype_struct_declarators { 987 symtyp = FMEMBER; 988 } T_COMMA type_struct_declarator { 989 $$ = concat_symbols($1, declare_member($4)); 990 } 991 ; 992 993 type_struct_declarators: 994 type_struct_declarator { 995 $$ = declare_member($1); 996 } 997 | type_struct_declarators { 998 symtyp = FMEMBER; 999 } T_COMMA type_struct_declarator { 1000 $$ = concat_symbols($1, declare_member($4)); 1001 } 1002 ; 1003 1004 notype_struct_declarator: 1005 notype_declarator 1006 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1007 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1008 } 1009 | { 1010 symtyp = FVFT; 1011 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1012 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1013 } 1014 ; 1015 1016 type_struct_declarator: 1017 type_declarator 1018 | type_declarator T_COLON constant_expr { 1019 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1020 } 1021 | { 1022 symtyp = FVFT; 1023 } T_COLON constant_expr { 1024 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1025 } 1026 ; 1027 1028 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1029 enum_specifier: /* C99 6.7.2.2 */ 1030 enum gcc_attribute_specifier_list_opt identifier_sym { 1031 $$ = make_tag_type($3, ENUM, false, false); 1032 } 1033 | enum gcc_attribute_specifier_list_opt identifier_sym { 1034 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1035 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1036 $$ = complete_enum($5); 1037 } 1038 | enum gcc_attribute_specifier_list_opt { 1039 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1040 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1041 $$ = complete_enum($4); 1042 } 1043 | enum error { 1044 symtyp = FVFT; 1045 $$ = gettyp(INT); 1046 } 1047 ; 1048 1049 enum: /* helper for C99 6.7.2.2 */ 1050 T_ENUM { 1051 symtyp = FTAG; 1052 begin_declaration_level(DLK_ENUM); 1053 } 1054 ; 1055 1056 enum_declaration: /* helper for C99 6.7.2.2 */ 1057 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1058 $$ = $2; 1059 } 1060 ; 1061 1062 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1063 T_LBRACE { 1064 symtyp = FVFT; 1065 enumval = 0; 1066 } 1067 ; 1068 1069 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1070 enumerator_list 1071 | enumerator_list T_COMMA { 1072 if (!allow_c99 && !allow_trad) { 1073 /* trailing ',' prohibited in enum declaration */ 1074 error(54); 1075 } else { 1076 /* trailing ',' prohibited in enum declaration */ 1077 c99ism(54); 1078 } 1079 $$ = $1; 1080 } 1081 ; 1082 1083 enumerator_list: /* C99 6.7.2.2 */ 1084 enumerator 1085 | enumerator_list T_COMMA enumerator { 1086 $$ = concat_symbols($1, $3); 1087 } 1088 | error { 1089 $$ = NULL; 1090 } 1091 ; 1092 1093 enumerator: /* C99 6.7.2.2 */ 1094 identifier_sym gcc_attribute_specifier_list_opt { 1095 $$ = enumeration_constant($1, enumval, true); 1096 } 1097 | identifier_sym gcc_attribute_specifier_list_opt 1098 T_ASSIGN constant_expr { 1099 $$ = enumeration_constant($1, to_int_constant($4, true), 1100 false); 1101 } 1102 ; 1103 1104 type_qualifier: /* C99 6.7.3 */ 1105 T_QUAL 1106 | atomic { 1107 $$ = ATOMIC; 1108 } 1109 ; 1110 1111 atomic: /* helper */ 1112 T_ATOMIC { 1113 /* TODO: First fix c11ism, then use it here. */ 1114 if (!allow_c11) 1115 /* '_Atomic' requires C11 or later */ 1116 error(350); 1117 } 1118 ; 1119 1120 pointer: /* C99 6.7.5 */ 1121 asterisk type_qualifier_list_opt { 1122 $$ = merge_qualified_pointer($1, $2); 1123 } 1124 | asterisk type_qualifier_list_opt pointer { 1125 $$ = merge_qualified_pointer($1, $2); 1126 $$ = merge_qualified_pointer($$, $3); 1127 } 1128 ; 1129 1130 asterisk: /* helper for 'pointer' */ 1131 T_ASTERISK { 1132 $$ = xcalloc(1, sizeof(*$$)); 1133 $$->p_pointer = true; 1134 } 1135 ; 1136 1137 type_qualifier_list_opt: /* see C99 6.7.5 */ 1138 /* empty */ { 1139 $$ = NULL; 1140 } 1141 | type_qualifier_list 1142 ; 1143 1144 type_qualifier_list: /* C99 6.7.5 */ 1145 type_qualifier_list_elem 1146 | type_qualifier_list type_qualifier_list_elem { 1147 $$ = merge_qualified_pointer($1, $2); 1148 } 1149 ; 1150 1151 type_qualifier_list_elem: /* helper for 'pointer' */ 1152 type_qualifier { 1153 $$ = xcalloc(1, sizeof(*$$)); 1154 if ($1 == CONST) 1155 $$->p_const = true; 1156 if ($1 == VOLATILE) 1157 $$->p_volatile = true; 1158 } 1159 ; 1160 1161 /* 1162 * For an explanation of 'notype' in the following rules, see 1163 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1164 */ 1165 1166 notype_init_declarators: 1167 notype_init_declarator 1168 | notype_init_declarators T_COMMA type_init_declarator 1169 ; 1170 1171 type_init_declarators: 1172 type_init_declarator 1173 | type_init_declarators T_COMMA type_init_declarator 1174 ; 1175 1176 notype_init_declarator: 1177 notype_declarator asm_or_symbolrename_opt { 1178 cgram_declare($1, false, $2); 1179 check_size($1); 1180 } 1181 | notype_declarator asm_or_symbolrename_opt { 1182 begin_initialization($1); 1183 cgram_declare($1, true, $2); 1184 } T_ASSIGN initializer { 1185 check_size($1); 1186 end_initialization(); 1187 } 1188 ; 1189 1190 type_init_declarator: 1191 type_declarator asm_or_symbolrename_opt { 1192 cgram_declare($1, false, $2); 1193 check_size($1); 1194 } 1195 | type_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 notype_declarator: 1205 notype_direct_declarator 1206 | pointer notype_direct_declarator { 1207 $$ = add_pointer($2, $1); 1208 } 1209 ; 1210 1211 type_declarator: 1212 type_direct_declarator 1213 | pointer type_direct_declarator { 1214 $$ = add_pointer($2, $1); 1215 } 1216 ; 1217 1218 notype_direct_declarator: 1219 type_attribute_list_opt T_NAME { 1220 $$ = declarator_name(getsym($2)); 1221 } 1222 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1223 $$ = $3; 1224 } 1225 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1226 $$ = add_array($1, $3.has_dim, $3.dim); 1227 } 1228 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1229 $$ = add_function(symbolrename($1, $3), $2); 1230 end_declaration_level(); 1231 block_level--; 1232 } 1233 | notype_direct_declarator type_attribute 1234 ; 1235 1236 type_direct_declarator: 1237 type_attribute_list_opt identifier { 1238 $$ = declarator_name(getsym($2)); 1239 } 1240 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1241 $$ = $3; 1242 } 1243 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1244 $$ = add_array($1, $3.has_dim, $3.dim); 1245 } 1246 | type_direct_declarator param_list asm_or_symbolrename_opt { 1247 $$ = add_function(symbolrename($1, $3), $2); 1248 end_declaration_level(); 1249 block_level--; 1250 } 1251 | type_direct_declarator type_attribute 1252 ; 1253 1254 /* 1255 * The two distinct rules type_param_declarator and notype_param_declarator 1256 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1257 * always treated as a typename, not an argument name. For example, after 1258 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1259 * "f(int (double));", not "f(int a);". 1260 */ 1261 type_param_declarator: 1262 direct_param_declarator 1263 | pointer direct_param_declarator { 1264 $$ = add_pointer($2, $1); 1265 } 1266 ; 1267 1268 notype_param_declarator: 1269 direct_notype_param_declarator 1270 | pointer direct_notype_param_declarator { 1271 $$ = add_pointer($2, $1); 1272 } 1273 ; 1274 1275 direct_param_declarator: 1276 identifier type_attribute_list { 1277 $$ = declarator_name(getsym($1)); 1278 } 1279 | identifier { 1280 $$ = declarator_name(getsym($1)); 1281 } 1282 | T_LPAREN notype_param_declarator T_RPAREN { 1283 $$ = $2; 1284 } 1285 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1286 gcc_attribute_specifier_list_opt { 1287 $$ = add_array($1, $3.has_dim, $3.dim); 1288 } 1289 | direct_param_declarator param_list asm_or_symbolrename_opt { 1290 $$ = add_function(symbolrename($1, $3), $2); 1291 end_declaration_level(); 1292 block_level--; 1293 } 1294 ; 1295 1296 direct_notype_param_declarator: 1297 identifier { 1298 $$ = declarator_name(getsym($1)); 1299 } 1300 | T_LPAREN notype_param_declarator T_RPAREN { 1301 $$ = $2; 1302 } 1303 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1304 $$ = add_array($1, $3.has_dim, $3.dim); 1305 } 1306 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1307 $$ = add_function(symbolrename($1, $3), $2); 1308 end_declaration_level(); 1309 block_level--; 1310 } 1311 ; 1312 1313 param_list: 1314 id_list_lparen identifier_list T_RPAREN { 1315 $$ = $2; 1316 } 1317 | abstract_decl_param_list 1318 ; 1319 1320 id_list_lparen: 1321 T_LPAREN { 1322 block_level++; 1323 begin_declaration_level(DLK_PROTO_PARAMS); 1324 } 1325 ; 1326 1327 array_size_opt: 1328 /* empty */ { 1329 $$.has_dim = false; 1330 $$.dim = 0; 1331 } 1332 | T_ASTERISK { 1333 /* since C99; variable length array of unspecified size */ 1334 $$.has_dim = false; /* TODO: maybe change to true */ 1335 $$.dim = 0; /* just as a placeholder */ 1336 } 1337 | array_size { 1338 $$.has_dim = true; 1339 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1340 } 1341 ; 1342 1343 array_size: 1344 type_qualifier_list_opt T_SCLASS constant_expr { 1345 /* C11 6.7.6.3p7 */ 1346 if ($2 != STATIC) 1347 yyerror("Bad attribute"); 1348 /* static array size is a C11 extension */ 1349 c11ism(343); 1350 $$ = $3; 1351 } 1352 | type_qualifier { 1353 /* C11 6.7.6.2 */ 1354 if ($1 != RESTRICT) 1355 yyerror("Bad attribute"); 1356 $$ = NULL; 1357 } 1358 | constant_expr 1359 ; 1360 1361 identifier_list: /* C99 6.7.5 */ 1362 T_NAME { 1363 $$ = old_style_function_parameter_name(getsym($1)); 1364 } 1365 | identifier_list T_COMMA T_NAME { 1366 $$ = concat_symbols($1, 1367 old_style_function_parameter_name(getsym($3))); 1368 } 1369 | identifier_list error 1370 ; 1371 1372 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1373 type_name: /* C99 6.7.6 */ 1374 { 1375 begin_declaration_level(DLK_ABSTRACT); 1376 } abstract_declaration { 1377 end_declaration_level(); 1378 $$ = $2->s_type; 1379 } 1380 ; 1381 1382 abstract_declaration: /* specific to lint */ 1383 begin_type_qualifier_list end_type { 1384 $$ = declare_abstract_type(abstract_name()); 1385 } 1386 | begin_type_specifier_qualifier_list end_type { 1387 $$ = declare_abstract_type(abstract_name()); 1388 } 1389 | begin_type_qualifier_list end_type abstract_declarator { 1390 $$ = declare_abstract_type($3); 1391 } 1392 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1393 $$ = declare_abstract_type($3); 1394 } 1395 ; 1396 1397 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1398 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1399 abstract_declarator: 1400 pointer { 1401 $$ = add_pointer(abstract_name(), $1); 1402 } 1403 | direct_abstract_declarator 1404 | pointer direct_abstract_declarator { 1405 $$ = add_pointer($2, $1); 1406 } 1407 | type_attribute_list direct_abstract_declarator { 1408 $$ = $2; 1409 } 1410 | pointer type_attribute_list direct_abstract_declarator { 1411 $$ = add_pointer($3, $1); 1412 } 1413 ; 1414 1415 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1416 direct_abstract_declarator: 1417 /* TODO: sort rules according to C99 */ 1418 T_LPAREN abstract_declarator T_RPAREN { 1419 $$ = $2; 1420 } 1421 | T_LBRACK array_size_opt T_RBRACK { 1422 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1423 } 1424 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1425 $$ = add_array($1, $3.has_dim, $3.dim); 1426 } 1427 | abstract_decl_param_list asm_or_symbolrename_opt { 1428 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1429 end_declaration_level(); 1430 block_level--; 1431 } 1432 | direct_abstract_declarator abstract_decl_param_list 1433 asm_or_symbolrename_opt { 1434 $$ = add_function(symbolrename($1, $3), $2); 1435 end_declaration_level(); 1436 block_level--; 1437 } 1438 | direct_abstract_declarator type_attribute_list 1439 ; 1440 1441 abstract_decl_param_list: /* specific to lint */ 1442 abstract_decl_lparen T_RPAREN type_attribute_opt { 1443 $$ = NULL; 1444 } 1445 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1446 type_attribute_opt { 1447 dcs->d_prototype = true; 1448 $$ = $2; 1449 } 1450 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1451 $$ = NULL; 1452 } 1453 ; 1454 1455 abstract_decl_lparen: /* specific to lint */ 1456 T_LPAREN { 1457 block_level++; 1458 begin_declaration_level(DLK_PROTO_PARAMS); 1459 } 1460 ; 1461 1462 vararg_parameter_type_list: /* specific to lint */ 1463 parameter_type_list 1464 | parameter_type_list T_COMMA T_ELLIPSIS { 1465 dcs->d_vararg = true; 1466 $$ = $1; 1467 } 1468 | T_ELLIPSIS { 1469 /* TODO: C99 6.7.5 makes this an error as well. */ 1470 if (!allow_trad && !allow_c99) { 1471 /* ANSI C requires formal parameter before '...' */ 1472 error(84); 1473 } else if (allow_c90) { 1474 /* ANSI C requires formal parameter before '...' */ 1475 warning(84); 1476 } 1477 dcs->d_vararg = true; 1478 $$ = NULL; 1479 } 1480 ; 1481 1482 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1483 parameter_type_list: 1484 parameter_declaration 1485 | parameter_type_list T_COMMA parameter_declaration { 1486 $$ = concat_symbols($1, $3); 1487 } 1488 ; 1489 1490 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1491 parameter_declaration: 1492 begin_type_declmods end_type { 1493 /* ^^ There is no check for the missing type-specifier. */ 1494 $$ = declare_argument(abstract_name(), false); 1495 } 1496 | begin_type_declaration_specifiers end_type { 1497 $$ = declare_argument(abstract_name(), false); 1498 } 1499 | begin_type_declmods end_type notype_param_declarator { 1500 /* ^^ There is no check for the missing type-specifier. */ 1501 $$ = declare_argument($3, false); 1502 } 1503 /* 1504 * type_param_declarator is needed because of following conflict: 1505 * "typedef int a; f(int (a));" could be parsed as 1506 * "function with argument a of type int", or 1507 * "function with an abstract argument of type function". 1508 * This grammar realizes the second case. 1509 */ 1510 | begin_type_declaration_specifiers end_type type_param_declarator { 1511 $$ = declare_argument($3, false); 1512 } 1513 | begin_type_declmods end_type abstract_declarator { 1514 /* ^^ There is no check for the missing type-specifier. */ 1515 $$ = declare_argument($3, false); 1516 } 1517 | begin_type_declaration_specifiers end_type abstract_declarator { 1518 $$ = declare_argument($3, false); 1519 } 1520 ; 1521 1522 initializer: /* C99 6.7.8 "Initialization" */ 1523 assignment_expression { 1524 init_expr($1); 1525 } 1526 | init_lbrace init_rbrace { 1527 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1528 } 1529 | init_lbrace initializer_list comma_opt init_rbrace 1530 /* XXX: What is this error handling for? */ 1531 | error 1532 ; 1533 1534 initializer_list: /* C99 6.7.8 "Initialization" */ 1535 initializer_list_item 1536 | initializer_list T_COMMA initializer_list_item 1537 ; 1538 1539 initializer_list_item: /* helper */ 1540 designation initializer 1541 | initializer 1542 ; 1543 1544 designation: /* C99 6.7.8 "Initialization" */ 1545 begin_designation designator_list T_ASSIGN 1546 | identifier T_COLON { 1547 /* GCC style struct or union member name in initializer */ 1548 gnuism(315); 1549 begin_designation(); 1550 add_designator_member($1); 1551 } 1552 ; 1553 1554 begin_designation: /* lint-specific helper */ 1555 /* empty */ { 1556 begin_designation(); 1557 } 1558 ; 1559 1560 designator_list: /* C99 6.7.8 "Initialization" */ 1561 designator 1562 | designator_list designator 1563 ; 1564 1565 designator: /* C99 6.7.8 "Initialization" */ 1566 T_LBRACK range T_RBRACK { 1567 if (!allow_c99) 1568 /* array initializer with designators is a C99 ... */ 1569 warning(321); 1570 add_designator_subscript($2); 1571 } 1572 | T_POINT identifier { 1573 if (!allow_c99) 1574 /* struct or union member name in initializer is ... */ 1575 warning(313); 1576 add_designator_member($2); 1577 } 1578 ; 1579 1580 static_assert_declaration: 1581 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1582 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1583 ; 1584 1585 range: 1586 constant_expr { 1587 $$.lo = to_int_constant($1, true); 1588 $$.hi = $$.lo; 1589 } 1590 | constant_expr T_ELLIPSIS constant_expr { 1591 $$.lo = to_int_constant($1, true); 1592 $$.hi = to_int_constant($3, true); 1593 /* initialization with '[a...b]' is a GCC extension */ 1594 gnuism(340); 1595 } 1596 ; 1597 1598 init_lbrace: /* helper */ 1599 T_LBRACE { 1600 init_lbrace(); 1601 } 1602 ; 1603 1604 init_rbrace: /* helper */ 1605 T_RBRACE { 1606 init_rbrace(); 1607 } 1608 ; 1609 1610 asm_or_symbolrename_opt: /* GCC extensions */ 1611 /* empty */ { 1612 $$ = NULL; 1613 } 1614 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1615 freeyyv(&$3, T_STRING); 1616 $$ = NULL; 1617 } 1618 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1619 gcc_attribute_specifier_list_opt { 1620 $$ = $3; 1621 } 1622 ; 1623 1624 statement: /* C99 6.8 */ 1625 expression_statement 1626 | non_expr_statement 1627 ; 1628 1629 non_expr_statement: /* helper for C99 6.8 */ 1630 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1631 | labeled_statement 1632 | compound_statement 1633 | selection_statement 1634 | iteration_statement 1635 | jump_statement { 1636 seen_fallthrough = false; 1637 } 1638 | asm_statement 1639 ; 1640 1641 labeled_statement: /* C99 6.8.1 */ 1642 label gcc_attribute_specifier_list_opt statement 1643 ; 1644 1645 label: 1646 T_NAME T_COLON { 1647 symtyp = FLABEL; 1648 named_label(getsym($1)); 1649 } 1650 | T_CASE constant_expr T_COLON { 1651 case_label($2); 1652 seen_fallthrough = true; 1653 } 1654 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1655 /* XXX: We don't fill all cases */ 1656 case_label($2); 1657 seen_fallthrough = true; 1658 } 1659 | T_DEFAULT T_COLON { 1660 default_label(); 1661 seen_fallthrough = true; 1662 } 1663 ; 1664 1665 compound_statement: /* C99 6.8.2 */ 1666 compound_statement_lbrace compound_statement_rbrace 1667 | compound_statement_lbrace block_item_list compound_statement_rbrace 1668 ; 1669 1670 compound_statement_lbrace: 1671 T_LBRACE { 1672 block_level++; 1673 mem_block_level++; 1674 begin_declaration_level(DLK_AUTO); 1675 } 1676 ; 1677 1678 compound_statement_rbrace: 1679 T_RBRACE { 1680 end_declaration_level(); 1681 level_free_all(mem_block_level); 1682 mem_block_level--; 1683 block_level--; 1684 seen_fallthrough = false; 1685 } 1686 ; 1687 1688 block_item_list: /* C99 6.8.2 */ 1689 block_item 1690 | block_item_list block_item { 1691 if ($1 && !$2) 1692 /* declarations after statements is a C99 feature */ 1693 c99ism(327); 1694 $$ = $1 || $2; 1695 } 1696 ; 1697 1698 block_item: /* C99 6.8.2 */ 1699 declaration_or_error { 1700 $$ = false; 1701 restore_warning_flags(); 1702 } 1703 | statement { 1704 $$ = true; 1705 restore_warning_flags(); 1706 } 1707 ; 1708 1709 expression_statement: /* C99 6.8.3 */ 1710 expression T_SEMI { 1711 expr($1, false, false, false, false); 1712 seen_fallthrough = false; 1713 } 1714 | T_SEMI { 1715 check_statement_reachable(); 1716 seen_fallthrough = false; 1717 } 1718 ; 1719 1720 selection_statement: /* C99 6.8.4 */ 1721 if_without_else %prec T_THEN { 1722 save_warning_flags(); 1723 stmt_if_then_stmt(); 1724 stmt_if_else_stmt(false); 1725 } 1726 | if_without_else T_ELSE { 1727 save_warning_flags(); 1728 stmt_if_then_stmt(); 1729 } statement { 1730 clear_warning_flags(); 1731 stmt_if_else_stmt(true); 1732 } 1733 | if_without_else T_ELSE error { 1734 clear_warning_flags(); 1735 stmt_if_else_stmt(false); 1736 } 1737 | switch_expr statement { 1738 clear_warning_flags(); 1739 stmt_switch_expr_stmt(); 1740 } 1741 | switch_expr error { 1742 clear_warning_flags(); 1743 stmt_switch_expr_stmt(); 1744 } 1745 ; 1746 1747 if_without_else: /* see C99 6.8.4 */ 1748 if_expr statement 1749 | if_expr error 1750 ; 1751 1752 if_expr: /* see C99 6.8.4 */ 1753 T_IF T_LPAREN expression T_RPAREN { 1754 stmt_if_expr($3); 1755 clear_warning_flags(); 1756 } 1757 ; 1758 1759 switch_expr: /* see C99 6.8.4 */ 1760 T_SWITCH T_LPAREN expression T_RPAREN { 1761 stmt_switch_expr($3); 1762 clear_warning_flags(); 1763 } 1764 ; 1765 1766 iteration_statement: /* C99 6.8.5 */ 1767 while_expr statement { 1768 clear_warning_flags(); 1769 stmt_while_expr_stmt(); 1770 } 1771 | while_expr error { 1772 clear_warning_flags(); 1773 stmt_while_expr_stmt(); 1774 } 1775 | do_statement do_while_expr { 1776 stmt_do_while_expr($2); 1777 seen_fallthrough = false; 1778 } 1779 | do error { 1780 clear_warning_flags(); 1781 stmt_do_while_expr(NULL); 1782 } 1783 | for_exprs statement { 1784 clear_warning_flags(); 1785 stmt_for_exprs_stmt(); 1786 end_declaration_level(); 1787 block_level--; 1788 } 1789 | for_exprs error { 1790 clear_warning_flags(); 1791 stmt_for_exprs_stmt(); 1792 end_declaration_level(); 1793 block_level--; 1794 } 1795 ; 1796 1797 while_expr: /* see C99 6.8.5 */ 1798 T_WHILE T_LPAREN expression T_RPAREN { 1799 stmt_while_expr($3); 1800 clear_warning_flags(); 1801 } 1802 ; 1803 1804 do_statement: /* see C99 6.8.5 */ 1805 do statement { 1806 clear_warning_flags(); 1807 } 1808 ; 1809 1810 do: /* see C99 6.8.5 */ 1811 T_DO { 1812 stmt_do(); 1813 } 1814 ; 1815 1816 do_while_expr: /* see C99 6.8.5 */ 1817 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1818 $$ = $3; 1819 } 1820 ; 1821 1822 for_start: /* see C99 6.8.5 */ 1823 T_FOR T_LPAREN { 1824 begin_declaration_level(DLK_AUTO); 1825 block_level++; 1826 } 1827 ; 1828 1829 for_exprs: /* see C99 6.8.5 */ 1830 for_start 1831 begin_type_declaration_specifiers end_type 1832 notype_init_declarators T_SEMI 1833 expression_opt T_SEMI 1834 expression_opt T_RPAREN { 1835 /* variable declaration in for loop */ 1836 c99ism(325); 1837 stmt_for_exprs(NULL, $6, $8); 1838 clear_warning_flags(); 1839 } 1840 | for_start 1841 expression_opt T_SEMI 1842 expression_opt T_SEMI 1843 expression_opt T_RPAREN { 1844 stmt_for_exprs($2, $4, $6); 1845 clear_warning_flags(); 1846 } 1847 ; 1848 1849 jump_statement: /* C99 6.8.6 */ 1850 goto identifier T_SEMI { 1851 stmt_goto(getsym($2)); 1852 } 1853 | goto error T_SEMI { 1854 symtyp = FVFT; 1855 } 1856 | T_CONTINUE T_SEMI { 1857 stmt_continue(); 1858 } 1859 | T_BREAK T_SEMI { 1860 stmt_break(); 1861 } 1862 | T_RETURN sys T_SEMI { 1863 stmt_return($2, NULL); 1864 } 1865 | T_RETURN sys expression T_SEMI { 1866 stmt_return($2, $3); 1867 } 1868 ; 1869 1870 goto: /* see C99 6.8.6 */ 1871 T_GOTO { 1872 symtyp = FLABEL; 1873 } 1874 ; 1875 1876 asm_statement: /* GCC extension */ 1877 T_ASM T_LPAREN read_until_rparen T_SEMI { 1878 dcs_set_asm(); 1879 } 1880 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 1881 dcs_set_asm(); 1882 } 1883 | T_ASM error 1884 ; 1885 1886 read_until_rparen: /* helper for 'asm_statement' */ 1887 /* empty */ { 1888 read_until_rparen(); 1889 } 1890 ; 1891 1892 translation_unit: /* C99 6.9 */ 1893 external_declaration 1894 | translation_unit external_declaration 1895 ; 1896 1897 external_declaration: /* C99 6.9 */ 1898 function_definition { 1899 global_clean_up_decl(false); 1900 clear_warning_flags(); 1901 } 1902 | top_level_declaration { 1903 global_clean_up_decl(false); 1904 clear_warning_flags(); 1905 } 1906 | asm_statement /* GCC extension */ 1907 | T_SEMI { /* GCC extension */ 1908 /* 1909 * TODO: Only allow this in GCC mode, not in plain C99. 1910 * This is one of the top 10 warnings in the NetBSD build. 1911 */ 1912 if (!allow_trad && !allow_c99) { 1913 /* empty declaration */ 1914 error(0); 1915 } else if (allow_c90) { 1916 /* empty declaration */ 1917 warning(0); 1918 } 1919 } 1920 ; 1921 1922 /* 1923 * On the top level, lint allows several forms of declarations that it doesn't 1924 * allow in functions. For example, a single ';' is an empty declaration and 1925 * is supported by some compilers, but in a function it would be an empty 1926 * statement, not a declaration. This makes a difference in C90 mode, where 1927 * a statement must not be followed by a declaration. 1928 * 1929 * See 'declaration' for all other declarations. 1930 */ 1931 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1932 begin_type end_type notype_init_declarators T_SEMI { 1933 /* TODO: Make this an error in C99 mode as well. */ 1934 if (!allow_trad && !allow_c99) { 1935 /* old-style declaration; add 'int' */ 1936 error(1); 1937 } else if (allow_c90) { 1938 /* old-style declaration; add 'int' */ 1939 warning(1); 1940 } 1941 } 1942 | declaration 1943 | error T_SEMI { 1944 global_clean_up(); 1945 } 1946 | error T_RBRACE { 1947 global_clean_up(); 1948 } 1949 ; 1950 1951 function_definition: /* C99 6.9.1 */ 1952 func_declarator { 1953 if ($1->s_type->t_tspec != FUNC) { 1954 /* syntax error '%s' */ 1955 error(249, yytext); 1956 YYERROR; 1957 } 1958 if ($1->s_type->t_typedef) { 1959 /* ()-less function definition */ 1960 error(64); 1961 YYERROR; 1962 } 1963 begin_function($1); 1964 block_level++; 1965 begin_declaration_level(DLK_OLD_STYLE_ARGS); 1966 if (lwarn == LWARN_NONE) 1967 $1->s_used = true; 1968 } arg_declaration_list_opt { 1969 end_declaration_level(); 1970 block_level--; 1971 check_func_lint_directives(); 1972 check_func_old_style_arguments(); 1973 begin_control_statement(CS_FUNCTION_BODY); 1974 } compound_statement { 1975 end_function(); 1976 end_control_statement(CS_FUNCTION_BODY); 1977 } 1978 ; 1979 1980 func_declarator: 1981 begin_type end_type notype_declarator { 1982 if (!allow_trad) { 1983 /* old-style declaration; add 'int' */ 1984 error(1); 1985 } 1986 $$ = $3; 1987 } 1988 | begin_type_declmods end_type notype_declarator { 1989 if (!allow_trad) { 1990 /* old-style declaration; add 'int' */ 1991 error(1); 1992 } 1993 $$ = $3; 1994 } 1995 | begin_type_declaration_specifiers end_type type_declarator { 1996 $$ = $3; 1997 } 1998 ; 1999 2000 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2001 /* empty */ 2002 | arg_declaration_list 2003 ; 2004 2005 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2006 arg_declaration 2007 | arg_declaration_list arg_declaration 2008 /* XXX or better "arg_declaration error" ? */ 2009 | error 2010 ; 2011 2012 /* 2013 * "arg_declaration" is separated from "declaration" because it 2014 * needs other error handling. 2015 */ 2016 arg_declaration: 2017 begin_type_declmods end_type T_SEMI { 2018 /* empty declaration */ 2019 warning(2); 2020 } 2021 | begin_type_declmods end_type notype_init_declarators T_SEMI 2022 | begin_type_declaration_specifiers end_type T_SEMI { 2023 if (!dcs->d_nonempty_decl) { 2024 /* empty declaration */ 2025 warning(2); 2026 } else { 2027 /* '%s' declared in argument declaration list */ 2028 warning(3, type_name(dcs->d_type)); 2029 } 2030 } 2031 | begin_type_declaration_specifiers end_type 2032 type_init_declarators T_SEMI { 2033 if (dcs->d_nonempty_decl) { 2034 /* '%s' declared in argument declaration list */ 2035 warning(3, type_name(dcs->d_type)); 2036 } 2037 } 2038 | begin_type_declmods error 2039 | begin_type_declaration_specifiers error 2040 ; 2041 2042 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2043 gcc_attribute_specifier_list_opt: 2044 /* empty */ 2045 | gcc_attribute_specifier_list 2046 ; 2047 2048 gcc_attribute_specifier_list: 2049 gcc_attribute_specifier 2050 | gcc_attribute_specifier_list gcc_attribute_specifier 2051 ; 2052 2053 gcc_attribute_specifier: 2054 T_ATTRIBUTE T_LPAREN T_LPAREN { 2055 in_gcc_attribute = true; 2056 } gcc_attribute_list { 2057 in_gcc_attribute = false; 2058 } T_RPAREN T_RPAREN 2059 ; 2060 2061 gcc_attribute_list: 2062 gcc_attribute 2063 | gcc_attribute_list T_COMMA gcc_attribute 2064 ; 2065 2066 gcc_attribute: 2067 /* empty */ 2068 | T_NAME { 2069 const char *name = $1->sb_name; 2070 if (is_either(name, "packed", "__packed__")) 2071 dcs_add_packed(); 2072 else if (is_either(name, "used", "__used__") || 2073 is_either(name, "unused", "__unused__")) 2074 dcs_set_used(); 2075 else if (is_either(name, "fallthrough", "__fallthrough__")) 2076 fallthru(1); 2077 } 2078 | T_NAME T_LPAREN T_RPAREN 2079 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2080 | type_qualifier { 2081 if ($1 != CONST) 2082 yyerror("Bad attribute"); 2083 } 2084 ; 2085 2086 gcc_attribute_parameters: 2087 constant_expr 2088 | gcc_attribute_parameters T_COMMA constant_expr 2089 ; 2090 2091 sys: 2092 /* empty */ { 2093 $$ = in_system_header; 2094 } 2095 ; 2096 2097 %% 2098 2099 /* ARGSUSED */ 2100 int 2101 yyerror(const char *msg) 2102 { 2103 /* syntax error '%s' */ 2104 error(249, yytext); 2105 if (++sytxerr >= 5) 2106 norecover(); 2107 return 0; 2108 } 2109 2110 #if YYDEBUG && (YYBYACC || YYBISON) 2111 static const char * 2112 cgram_to_string(int token, YYSTYPE val) 2113 { 2114 2115 switch (token) { 2116 case T_INCDEC: 2117 case T_MULTIPLICATIVE: 2118 case T_ADDITIVE: 2119 case T_SHIFT: 2120 case T_RELATIONAL: 2121 case T_EQUALITY: 2122 case T_OPASSIGN: 2123 return modtab[val.y_op].m_name; 2124 case T_SCLASS: 2125 return scl_name(val.y_scl); 2126 case T_TYPE: 2127 case T_STRUCT_OR_UNION: 2128 return tspec_name(val.y_tspec); 2129 case T_QUAL: 2130 return tqual_name(val.y_tqual); 2131 case T_NAME: 2132 return val.y_name->sb_name; 2133 default: 2134 return "<none>"; 2135 } 2136 } 2137 #endif 2138 2139 #if YYDEBUG && YYBISON 2140 static inline void 2141 cgram_print(FILE *output, int token, YYSTYPE val) 2142 { 2143 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2144 } 2145 #endif 2146 2147 static void 2148 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2149 { 2150 declare(decl, has_initializer, renaming); 2151 if (renaming != NULL) 2152 freeyyv(&renaming, T_NAME); 2153 } 2154 2155 /* 2156 * Discard all input tokens up to and including the next 2157 * unmatched right paren 2158 */ 2159 static void 2160 read_until_rparen(void) 2161 { 2162 int level; 2163 2164 if (yychar < 0) 2165 yychar = yylex(); 2166 freeyyv(&yylval, yychar); 2167 2168 level = 1; 2169 while (yychar > 0) { 2170 if (yychar == T_LPAREN) 2171 level++; 2172 if (yychar == T_RPAREN && --level == 0) 2173 break; 2174 freeyyv(&yylval, yychar = yylex()); 2175 } 2176 2177 yyclearin; 2178 } 2179 2180 static sym_t * 2181 symbolrename(sym_t *s, sbuf_t *sb) 2182 { 2183 if (sb != NULL) 2184 s->s_rename = sb->sb_name; 2185 return s; 2186 } 2187
Indexes created Fri Oct 03 02:09:57 GMT 2025