cgram.y revision 1.440
1 %{ 2 /* $NetBSD: cgram.y,v 1.440 2023/06/30 08:03:01 rillig Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved. 6 * Copyright (c) 1994, 1995 Jochen Pohl 7 * All Rights Reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Jochen Pohl for 20 * The NetBSD Project. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) 38 __RCSID("$NetBSD: cgram.y,v 1.440 2023/06/30 08:03:01 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 /* 89 * There used to be an assertion that saved_lwarn is 90 * LWARN_NOTHING_SAVED here, but that triggered for the following 91 * code: 92 * 93 * void function(int x) { if (x > 0) if (x > 1) return; } 94 * 95 * It didn't trigger if the inner 'if' was enclosed in braces though. 96 * 97 * TODO: If actually needed, add support for nested suppression of 98 * warnings. 99 */ 100 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 101 saved_lwarn = lwarn; 102 } 103 104 /* ARGSUSED */ 105 static void 106 restore_warning_flags_loc(const char *file, size_t line) 107 { 108 if (saved_lwarn != LWARN_NOTHING_SAVED) { 109 lwarn = saved_lwarn; 110 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 111 /* 112 * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to 113 * avoid triggering the assertion in save_warning_flags_loc. 114 */ 115 } else 116 clear_warning_flags_loc(file, line); 117 } 118 119 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 120 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 121 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 122 123 /* unbind the anonymous struct members from the struct */ 124 static void 125 anonymize(sym_t *s) 126 { 127 for ( ; s != NULL; s = s->s_next) 128 s->u.s_member.sm_sou_type = NULL; 129 } 130 131 static bool 132 is_either(const char *s, const char *a, const char *b) 133 { 134 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 135 } 136 137 #if YYDEBUG && (YYBYACC || YYBISON) 138 #define YYSTYPE_TOSTRING cgram_to_string 139 #endif 140 #if YYDEBUG && YYBISON 141 #define YYPRINT cgram_print 142 #endif 143 144 %} 145 146 %expect 131 147 148 %union { 149 val_t *y_val; 150 sbuf_t *y_name; 151 sym_t *y_sym; 152 op_t y_op; 153 scl_t y_scl; 154 tspec_t y_tspec; 155 tqual_t y_tqual; 156 type_t *y_type; 157 tnode_t *y_tnode; 158 range_t y_range; 159 strg_t *y_string; 160 qual_ptr *y_qual_ptr; 161 bool y_seen_statement; 162 struct generic_association *y_generic; 163 struct array_size y_array_size; 164 bool y_in_system_header; 165 }; 166 167 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 168 %token T_POINT T_ARROW 169 %token T_COMPLEMENT T_LOGNOT 170 %token <y_op> T_INCDEC 171 %token T_SIZEOF 172 %token T_BUILTIN_OFFSETOF 173 %token T_TYPEOF 174 %token T_EXTENSION 175 %token T_ALIGNAS 176 %token T_ALIGNOF 177 %token T_ASTERISK 178 %token <y_op> T_MULTIPLICATIVE 179 %token <y_op> T_ADDITIVE 180 %token <y_op> T_SHIFT 181 %token <y_op> T_RELATIONAL 182 %token <y_op> T_EQUALITY 183 %token T_AMPER 184 %token T_BITXOR 185 %token T_BITOR 186 %token T_LOGAND 187 %token T_LOGOR 188 %token T_QUEST 189 %token T_COLON 190 %token T_ASSIGN 191 %token <y_op> T_OPASSIGN 192 %token T_COMMA 193 %token T_SEMI 194 %token T_ELLIPSIS 195 %token T_REAL 196 %token T_IMAG 197 %token T_GENERIC 198 %token T_NORETURN 199 200 /* storage classes (extern, static, auto, register and typedef) */ 201 %token <y_scl> T_SCLASS 202 203 /* 204 * predefined type keywords (char, int, short, long, unsigned, signed, 205 * float, double, void); see T_TYPENAME for types from typedef 206 */ 207 %token <y_tspec> T_TYPE 208 209 /* qualifiers (const, volatile, restrict, _Thread_local) */ 210 %token <y_tqual> T_QUAL 211 %token <y_tqual> T_ATOMIC 212 213 /* struct or union */ 214 %token <y_tspec> T_STRUCT_OR_UNION 215 216 /* remaining keywords */ 217 %token T_ASM 218 %token T_BREAK 219 %token T_CASE 220 %token T_CONTINUE 221 %token T_DEFAULT 222 %token T_DO 223 %token T_ELSE 224 %token T_ENUM 225 %token T_FOR 226 %token T_GOTO 227 %token T_IF 228 %token T_PACKED 229 %token T_RETURN 230 %token T_SWITCH 231 %token T_SYMBOLRENAME 232 %token T_WHILE 233 %token T_STATIC_ASSERT 234 235 %token T_ATTRIBUTE 236 237 %left T_THEN 238 %left T_ELSE 239 %right T_QUEST T_COLON 240 %left T_LOGOR 241 %left T_LOGAND 242 %left T_BITOR 243 %left T_BITXOR 244 %left T_AMPER 245 %left T_EQUALITY 246 %left T_RELATIONAL 247 %left T_SHIFT 248 %left T_ADDITIVE 249 %left T_ASTERISK T_MULTIPLICATIVE 250 251 %token <y_name> T_NAME 252 %token <y_name> T_TYPENAME 253 %token <y_val> T_CON 254 %token <y_string> T_STRING 255 256 %type <y_sym> identifier_sym 257 %type <y_name> identifier 258 %type <y_string> string 259 260 %type <y_tnode> primary_expression 261 %type <y_tnode> generic_selection 262 %type <y_generic> generic_assoc_list 263 %type <y_generic> generic_association 264 %type <y_tnode> postfix_expression 265 %type <y_tnode> gcc_statement_expr_list 266 %type <y_tnode> gcc_statement_expr_item 267 %type <y_op> point_or_arrow 268 %type <y_tnode> argument_expression_list 269 %type <y_tnode> unary_expression 270 %type <y_tnode> cast_expression 271 %type <y_tnode> conditional_expression 272 %type <y_tnode> assignment_expression 273 %type <y_tnode> expression_opt 274 %type <y_tnode> expression 275 %type <y_tnode> constant_expr 276 277 %type <y_type> begin_type_typespec 278 %type <y_type> type_specifier 279 %type <y_type> notype_type_specifier 280 %type <y_type> atomic_type_specifier 281 %type <y_type> struct_or_union_specifier 282 %type <y_tspec> struct_or_union 283 %type <y_sym> braced_struct_declaration_list 284 %type <y_sym> struct_declaration_list_with_rbrace 285 %type <y_sym> struct_declaration_list 286 %type <y_sym> struct_declaration 287 %type <y_sym> notype_struct_declarators 288 %type <y_sym> type_struct_declarators 289 %type <y_sym> notype_struct_declarator 290 %type <y_sym> type_struct_declarator 291 %type <y_type> enum_specifier 292 %type <y_sym> enum_declaration 293 %type <y_sym> enums_with_opt_comma 294 %type <y_sym> enumerator_list 295 %type <y_sym> enumerator 296 %type <y_tqual> type_qualifier 297 %type <y_qual_ptr> pointer 298 %type <y_qual_ptr> asterisk 299 %type <y_qual_ptr> type_qualifier_list_opt 300 %type <y_qual_ptr> type_qualifier_list 301 %type <y_qual_ptr> type_qualifier_list_elem 302 %type <y_sym> notype_declarator 303 %type <y_sym> type_declarator 304 %type <y_sym> notype_direct_declarator 305 %type <y_sym> type_direct_declarator 306 %type <y_sym> type_param_declarator 307 %type <y_sym> notype_param_declarator 308 %type <y_sym> direct_param_declarator 309 %type <y_sym> direct_notype_param_declarator 310 %type <y_sym> param_list 311 %type <y_array_size> array_size_opt 312 %type <y_tnode> array_size 313 %type <y_sym> identifier_list 314 %type <y_type> type_name 315 %type <y_sym> abstract_declaration 316 %type <y_sym> abstract_declarator 317 %type <y_sym> direct_abstract_declarator 318 %type <y_sym> abstract_decl_param_list 319 %type <y_sym> vararg_parameter_type_list 320 %type <y_sym> parameter_type_list 321 %type <y_sym> parameter_declaration 322 %type <y_range> range 323 %type <y_name> asm_or_symbolrename_opt 324 325 %type <y_seen_statement> block_item_list 326 %type <y_seen_statement> block_item 327 %type <y_tnode> do_while_expr 328 %type <y_sym> func_declarator 329 %type <y_in_system_header> sys 330 331 %{ 332 #if YYDEBUG && YYBISON 333 static inline void cgram_print(FILE *, int, YYSTYPE); 334 #endif 335 %} 336 337 %% 338 339 program: 340 /* empty */ { 341 /* TODO: Make this an error in C99 mode as well. */ 342 if (!allow_trad && !allow_c99) { 343 /* empty translation unit */ 344 error(272); 345 } else if (allow_c90) { 346 /* empty translation unit */ 347 warning(272); 348 } 349 } 350 | translation_unit 351 ; 352 353 identifier_sym: /* helper for struct/union/enum */ 354 identifier { 355 $$ = getsym($1); 356 } 357 ; 358 359 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 360 identifier: 361 T_NAME { 362 debug_step("cgram: name '%s'", $1->sb_name); 363 $$ = $1; 364 } 365 | T_TYPENAME { 366 debug_step("cgram: typename '%s'", $1->sb_name); 367 $$ = $1; 368 } 369 ; 370 371 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 372 string: 373 T_STRING 374 | string T_STRING { 375 if (!allow_c90) { 376 /* concatenated strings are illegal in traditional C */ 377 warning(219); 378 } 379 $$ = cat_strings($1, $2); 380 } 381 ; 382 383 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 384 primary_expression: 385 T_NAME { 386 bool sys_name, sys_next; 387 sys_name = in_system_header; 388 if (yychar < 0) 389 yychar = yylex(); 390 sys_next = in_system_header; 391 in_system_header = sys_name; 392 $$ = build_name(getsym($1), yychar == T_LPAREN); 393 in_system_header = sys_next; 394 } 395 | T_CON { 396 $$ = build_constant(gettyp($1->v_tspec), $1); 397 } 398 | string { 399 $$ = build_string($1); 400 } 401 | T_LPAREN expression T_RPAREN { 402 if ($2 != NULL) 403 $2->tn_parenthesized = true; 404 $$ = $2; 405 } 406 | generic_selection 407 /* GCC primary-expression, see c_parser_postfix_expression */ 408 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 409 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 410 symtyp = FMEMBER; 411 $$ = build_offsetof($3, getsym($5)); 412 } 413 ; 414 415 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 416 generic_selection: 417 T_GENERIC T_LPAREN assignment_expression T_COMMA 418 generic_assoc_list T_RPAREN { 419 /* generic selection requires C11 or later */ 420 c11ism(345); 421 $$ = build_generic_selection($3, $5); 422 } 423 ; 424 425 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 426 generic_assoc_list: 427 generic_association 428 | generic_assoc_list T_COMMA generic_association { 429 $3->ga_prev = $1; 430 $$ = $3; 431 } 432 ; 433 434 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 435 generic_association: 436 type_name T_COLON assignment_expression { 437 $$ = block_zero_alloc(sizeof(*$$)); 438 $$->ga_arg = $1; 439 $$->ga_result = $3; 440 } 441 | T_DEFAULT T_COLON assignment_expression { 442 $$ = block_zero_alloc(sizeof(*$$)); 443 $$->ga_arg = NULL; 444 $$->ga_result = $3; 445 } 446 ; 447 448 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 449 postfix_expression: 450 primary_expression 451 | postfix_expression T_LBRACK sys expression T_RBRACK { 452 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 453 } 454 | postfix_expression T_LPAREN sys T_RPAREN { 455 $$ = build_function_call($1, $3, NULL); 456 } 457 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 458 $$ = build_function_call($1, $3, $4); 459 } 460 | postfix_expression point_or_arrow sys T_NAME { 461 $$ = build_member_access($1, $2, $3, $4); 462 } 463 | postfix_expression T_INCDEC sys { 464 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 465 } 466 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 467 sym_t *tmp = mktempsym($2); 468 begin_initialization(tmp); 469 cgram_declare(tmp, true, NULL); 470 } init_lbrace initializer_list comma_opt init_rbrace { 471 if (!allow_c99) 472 /* compound literals are a C99/GCC extension */ 473 gnuism(319); 474 $$ = build_name(current_initsym(), false); 475 end_initialization(); 476 } 477 | T_LPAREN compound_statement_lbrace { 478 begin_statement_expr(); 479 } gcc_statement_expr_list { 480 do_statement_expr($4); 481 } compound_statement_rbrace T_RPAREN { 482 $$ = end_statement_expr(); 483 } 484 ; 485 486 comma_opt: /* helper for 'postfix_expression' */ 487 /* empty */ 488 | T_COMMA 489 ; 490 491 /* 492 * The inner part of a GCC statement-expression of the form ({ ... }). 493 * 494 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 495 */ 496 gcc_statement_expr_list: 497 gcc_statement_expr_item 498 | gcc_statement_expr_list gcc_statement_expr_item { 499 $$ = $2; 500 } 501 ; 502 503 gcc_statement_expr_item: 504 declaration_or_error { 505 clear_warning_flags(); 506 $$ = NULL; 507 } 508 | non_expr_statement { 509 $$ = expr_alloc_tnode(); 510 $$->tn_type = gettyp(VOID); 511 } 512 | expression T_SEMI { 513 if ($1 == NULL) { /* in case of syntax errors */ 514 $$ = expr_alloc_tnode(); 515 $$->tn_type = gettyp(VOID); 516 } else { 517 /* XXX: do that only on the last name */ 518 if ($1->tn_op == NAME) 519 $1->tn_sym->s_used = true; 520 expr($1, false, false, false, false); 521 seen_fallthrough = false; 522 $$ = $1; 523 } 524 } 525 ; 526 527 point_or_arrow: /* helper for 'postfix_expression' */ 528 T_POINT { 529 symtyp = FMEMBER; 530 $$ = POINT; 531 } 532 | T_ARROW { 533 symtyp = FMEMBER; 534 $$ = ARROW; 535 } 536 ; 537 538 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 539 argument_expression_list: 540 assignment_expression { 541 $$ = build_function_argument(NULL, $1); 542 } 543 | argument_expression_list T_COMMA assignment_expression { 544 $$ = build_function_argument($1, $3); 545 } 546 ; 547 548 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 549 unary_expression: 550 postfix_expression 551 | T_INCDEC sys unary_expression { 552 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 553 } 554 | T_AMPER sys cast_expression { 555 $$ = build_unary(ADDR, $2, $3); 556 } 557 | T_ASTERISK sys cast_expression { 558 $$ = build_unary(INDIR, $2, $3); 559 } 560 | T_ADDITIVE sys cast_expression { 561 if (!allow_c90 && $1 == PLUS) { 562 /* unary '+' is illegal in traditional C */ 563 warning(100); 564 } 565 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 566 } 567 | T_COMPLEMENT sys cast_expression { 568 $$ = build_unary(COMPL, $2, $3); 569 } 570 | T_LOGNOT sys cast_expression { 571 $$ = build_unary(NOT, $2, $3); 572 } 573 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 574 $$ = build_unary(REAL, $2, $3); 575 } 576 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 577 $$ = build_unary(IMAG, $2, $3); 578 } 579 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 580 $$ = $2; 581 } 582 | T_SIZEOF unary_expression { 583 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 584 if ($$ != NULL) 585 check_expr_misc($2, 586 false, false, false, false, false, true); 587 } 588 | T_SIZEOF T_LPAREN type_name T_RPAREN { 589 $$ = build_sizeof($3); 590 } 591 | T_ALIGNOF unary_expression { 592 /* non type argument to alignof is a GCC extension */ 593 gnuism(349); 594 lint_assert($2 != NULL); 595 $$ = build_alignof($2->tn_type); 596 } 597 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 598 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 599 /* TODO: c11ism */ 600 $$ = build_alignof($3); 601 } 602 ; 603 604 /* The rule 'unary_operator' is inlined into unary_expression. */ 605 606 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 607 cast_expression: 608 unary_expression 609 | T_LPAREN type_name T_RPAREN cast_expression { 610 $$ = cast($4, $2); 611 } 612 ; 613 614 expression_opt: 615 /* empty */ { 616 $$ = NULL; 617 } 618 | expression 619 ; 620 621 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 622 /* 'conditional_expression' also implements 'additive_expression'. */ 623 /* 'conditional_expression' also implements 'shift_expression'. */ 624 /* 'conditional_expression' also implements 'relational_expression'. */ 625 /* 'conditional_expression' also implements 'equality_expression'. */ 626 /* 'conditional_expression' also implements 'AND_expression'. */ 627 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 628 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 629 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 630 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 631 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 632 conditional_expression: 633 cast_expression 634 | conditional_expression T_ASTERISK sys conditional_expression { 635 $$ = build_binary($1, MULT, $3, $4); 636 } 637 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 638 $$ = build_binary($1, $2, $3, $4); 639 } 640 | conditional_expression T_ADDITIVE sys conditional_expression { 641 $$ = build_binary($1, $2, $3, $4); 642 } 643 | conditional_expression T_SHIFT sys conditional_expression { 644 $$ = build_binary($1, $2, $3, $4); 645 } 646 | conditional_expression T_RELATIONAL sys conditional_expression { 647 $$ = build_binary($1, $2, $3, $4); 648 } 649 | conditional_expression T_EQUALITY sys conditional_expression { 650 $$ = build_binary($1, $2, $3, $4); 651 } 652 | conditional_expression T_AMPER sys conditional_expression { 653 $$ = build_binary($1, BITAND, $3, $4); 654 } 655 | conditional_expression T_BITXOR sys conditional_expression { 656 $$ = build_binary($1, BITXOR, $3, $4); 657 } 658 | conditional_expression T_BITOR sys conditional_expression { 659 $$ = build_binary($1, BITOR, $3, $4); 660 } 661 | conditional_expression T_LOGAND sys conditional_expression { 662 $$ = build_binary($1, LOGAND, $3, $4); 663 } 664 | conditional_expression T_LOGOR sys conditional_expression { 665 $$ = build_binary($1, LOGOR, $3, $4); 666 } 667 | conditional_expression T_QUEST sys 668 expression T_COLON sys conditional_expression { 669 $$ = build_binary($1, QUEST, $3, 670 build_binary($4, COLON, $6, $7)); 671 } 672 ; 673 674 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 675 assignment_expression: 676 conditional_expression 677 | unary_expression T_ASSIGN sys assignment_expression { 678 $$ = build_binary($1, ASSIGN, $3, $4); 679 } 680 | unary_expression T_OPASSIGN sys assignment_expression { 681 $$ = build_binary($1, $2, $3, $4); 682 } 683 ; 684 685 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 686 expression: 687 assignment_expression 688 | expression T_COMMA sys assignment_expression { 689 $$ = build_binary($1, COMMA, $3, $4); 690 } 691 ; 692 693 constant_expr: /* C99 6.6 */ 694 conditional_expression 695 ; 696 697 declaration_or_error: 698 declaration 699 | error T_SEMI 700 ; 701 702 declaration: /* C99 6.7 */ 703 begin_type_declmods end_type T_SEMI { 704 if (dcs->d_scl == TYPEDEF) { 705 /* typedef declares no type name */ 706 warning(72); 707 } else { 708 /* empty declaration */ 709 warning(2); 710 } 711 } 712 | begin_type_declmods end_type notype_init_declarators T_SEMI { 713 if (dcs->d_scl == TYPEDEF) { 714 /* syntax error '%s' */ 715 error(249, "missing base type for typedef"); 716 } else { 717 /* old-style declaration; add 'int' */ 718 error(1); 719 } 720 } 721 | begin_type_declaration_specifiers end_type T_SEMI { 722 if (dcs->d_scl == TYPEDEF) { 723 /* typedef declares no type name */ 724 warning(72); 725 } else if (!dcs->d_nonempty_decl) { 726 /* empty declaration */ 727 warning(2); 728 } 729 } 730 | begin_type_declaration_specifiers end_type 731 type_init_declarators T_SEMI 732 | static_assert_declaration 733 ; 734 735 begin_type_declaration_specifiers: /* see C99 6.7 */ 736 begin_type_typespec { 737 dcs_add_type($1); 738 } 739 | begin_type_declmods type_specifier { 740 dcs_add_type($2); 741 } 742 | type_attribute begin_type_declaration_specifiers 743 | begin_type_declaration_specifiers declmod 744 | begin_type_declaration_specifiers notype_type_specifier { 745 dcs_add_type($2); 746 } 747 ; 748 749 begin_type_declmods: /* see C99 6.7 */ 750 begin_type type_qualifier { 751 dcs_add_qualifier($2); 752 } 753 | begin_type T_SCLASS { 754 dcs_add_storage_class($2); 755 } 756 | begin_type_declmods declmod 757 ; 758 759 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 760 begin_type_specifier_qualifier_list_postfix 761 | type_attribute_list begin_type_specifier_qualifier_list_postfix 762 ; 763 764 begin_type_specifier_qualifier_list_postfix: 765 begin_type_typespec { 766 dcs_add_type($1); 767 } 768 | begin_type_qualifier_list type_specifier { 769 dcs_add_type($2); 770 } 771 | begin_type_specifier_qualifier_list_postfix type_qualifier { 772 dcs_add_qualifier($2); 773 } 774 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 775 dcs_add_type($2); 776 } 777 | begin_type_specifier_qualifier_list_postfix type_attribute 778 ; 779 780 begin_type_typespec: 781 begin_type notype_type_specifier { 782 $$ = $2; 783 } 784 | begin_type T_TYPENAME { 785 $$ = getsym($2)->s_type; 786 } 787 ; 788 789 begin_type_qualifier_list: 790 begin_type type_qualifier { 791 dcs_add_qualifier($2); 792 } 793 | begin_type_qualifier_list type_qualifier { 794 dcs_add_qualifier($2); 795 } 796 ; 797 798 declmod: 799 type_qualifier { 800 dcs_add_qualifier($1); 801 } 802 | T_SCLASS { 803 dcs_add_storage_class($1); 804 } 805 | type_attribute_list 806 ; 807 808 type_attribute_list_opt: 809 /* empty */ 810 | type_attribute_list 811 ; 812 813 type_attribute_list: 814 type_attribute 815 | type_attribute_list type_attribute 816 ; 817 818 type_attribute_opt: 819 /* empty */ 820 | type_attribute 821 ; 822 823 type_attribute: /* See C11 6.7 declaration-specifiers */ 824 gcc_attribute_specifier 825 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 826 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 827 | T_PACKED { 828 dcs_add_packed(); 829 } 830 | T_NORETURN 831 ; 832 833 begin_type: 834 /* empty */ { 835 dcs_begin_type(); 836 } 837 ; 838 839 end_type: 840 /* empty */ { 841 dcs_end_type(); 842 } 843 ; 844 845 type_specifier: /* C99 6.7.2 */ 846 notype_type_specifier 847 | T_TYPENAME { 848 $$ = getsym($1)->s_type; 849 } 850 ; 851 852 notype_type_specifier: /* see C99 6.7.2 */ 853 T_TYPE { 854 $$ = gettyp($1); 855 } 856 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 857 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 858 $$->t_typeof = true; 859 } 860 | atomic_type_specifier 861 | struct_or_union_specifier { 862 end_declaration_level(); 863 $$ = $1; 864 } 865 | enum_specifier { 866 end_declaration_level(); 867 $$ = $1; 868 } 869 ; 870 871 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 872 atomic_type_specifier: 873 atomic T_LPAREN type_name T_RPAREN { 874 $$ = $3; 875 } 876 ; 877 878 struct_or_union_specifier: /* C99 6.7.2.1 */ 879 struct_or_union identifier_sym { 880 /* 881 * STDC requires that "struct a;" always introduces 882 * a new tag if "a" is not declared at current level 883 * 884 * yychar is valid because otherwise the parser would not 885 * have been able to decide if it must shift or reduce 886 */ 887 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 888 } 889 | struct_or_union identifier_sym { 890 dcs->d_tag_type = make_tag_type($2, $1, true, false); 891 } braced_struct_declaration_list { 892 $$ = complete_struct_or_union($4); 893 } 894 | struct_or_union { 895 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 896 } braced_struct_declaration_list { 897 $$ = complete_struct_or_union($3); 898 } 899 | struct_or_union error { 900 symtyp = FVFT; 901 $$ = gettyp(INT); 902 } 903 ; 904 905 struct_or_union: /* C99 6.7.2.1 */ 906 T_STRUCT_OR_UNION { 907 symtyp = FTAG; 908 begin_declaration_level($1 == STRUCT 909 ? DK_STRUCT_MEMBER 910 : DK_UNION_MEMBER); 911 dcs->d_offset_in_bits = 0; 912 dcs->d_sou_align_in_bits = CHAR_SIZE; 913 $$ = $1; 914 } 915 | struct_or_union type_attribute 916 ; 917 918 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 919 struct_declaration_lbrace struct_declaration_list_with_rbrace { 920 $$ = $2; 921 } 922 ; 923 924 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 925 T_LBRACE { 926 symtyp = FVFT; 927 } 928 ; 929 930 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 931 struct_declaration_list T_RBRACE 932 | T_RBRACE { 933 /* XXX: This is not allowed by any C standard. */ 934 $$ = NULL; 935 } 936 ; 937 938 struct_declaration_list: /* C99 6.7.2.1 */ 939 struct_declaration 940 | struct_declaration_list struct_declaration { 941 $$ = concat_lists($1, $2); 942 } 943 ; 944 945 struct_declaration: /* C99 6.7.2.1 */ 946 begin_type_qualifier_list end_type { 947 /* ^^ There is no check for the missing type-specifier. */ 948 /* too late, i know, but getsym() compensates it */ 949 symtyp = FMEMBER; 950 } notype_struct_declarators type_attribute_opt T_SEMI { 951 symtyp = FVFT; 952 $$ = $4; 953 } 954 | begin_type_specifier_qualifier_list end_type { 955 symtyp = FMEMBER; 956 } type_struct_declarators type_attribute_opt T_SEMI { 957 symtyp = FVFT; 958 $$ = $4; 959 } 960 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 961 /* syntax error '%s' */ 962 error(249, "member without type"); 963 $$ = NULL; 964 } 965 | begin_type_specifier_qualifier_list end_type type_attribute_opt 966 T_SEMI { 967 symtyp = FVFT; 968 if (!allow_c11 && !allow_gcc) 969 /* anonymous struct/union members is a C11 feature */ 970 warning(49); 971 if (is_struct_or_union(dcs->d_type->t_tspec)) { 972 $$ = dcs->d_type->t_sou->sou_first_member; 973 /* add all the members of the anonymous struct/union */ 974 anonymize($$); 975 } else { 976 /* syntax error '%s' */ 977 error(249, "unnamed member"); 978 $$ = NULL; 979 } 980 } 981 | static_assert_declaration { 982 $$ = NULL; 983 } 984 | error T_SEMI { 985 symtyp = FVFT; 986 $$ = NULL; 987 } 988 ; 989 990 notype_struct_declarators: 991 notype_struct_declarator { 992 $$ = declare_member($1); 993 } 994 | notype_struct_declarators { 995 symtyp = FMEMBER; 996 } T_COMMA type_struct_declarator { 997 $$ = concat_lists($1, declare_member($4)); 998 } 999 ; 1000 1001 type_struct_declarators: 1002 type_struct_declarator { 1003 $$ = declare_member($1); 1004 } 1005 | type_struct_declarators { 1006 symtyp = FMEMBER; 1007 } T_COMMA type_struct_declarator { 1008 $$ = concat_lists($1, declare_member($4)); 1009 } 1010 ; 1011 1012 notype_struct_declarator: 1013 notype_declarator 1014 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1015 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1016 } 1017 | { 1018 symtyp = FVFT; 1019 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1020 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1021 } 1022 ; 1023 1024 type_struct_declarator: 1025 type_declarator 1026 | type_declarator T_COLON constant_expr { 1027 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1028 } 1029 | { 1030 symtyp = FVFT; 1031 } T_COLON constant_expr { 1032 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1033 } 1034 ; 1035 1036 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1037 enum_specifier: /* C99 6.7.2.2 */ 1038 enum gcc_attribute_specifier_list_opt identifier_sym { 1039 $$ = make_tag_type($3, ENUM, false, false); 1040 } 1041 | enum gcc_attribute_specifier_list_opt identifier_sym { 1042 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1043 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1044 $$ = complete_enum($5); 1045 } 1046 | enum gcc_attribute_specifier_list_opt { 1047 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1048 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1049 $$ = complete_enum($4); 1050 } 1051 | enum error { 1052 symtyp = FVFT; 1053 $$ = gettyp(INT); 1054 } 1055 ; 1056 1057 enum: /* helper for C99 6.7.2.2 */ 1058 T_ENUM { 1059 symtyp = FTAG; 1060 begin_declaration_level(DK_ENUM_CONSTANT); 1061 } 1062 ; 1063 1064 enum_declaration: /* helper for C99 6.7.2.2 */ 1065 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1066 $$ = $2; 1067 } 1068 ; 1069 1070 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1071 T_LBRACE { 1072 symtyp = FVFT; 1073 enumval = 0; 1074 } 1075 ; 1076 1077 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1078 enumerator_list 1079 | enumerator_list T_COMMA { 1080 if (!allow_c99 && !allow_trad) { 1081 /* trailing ',' prohibited in enum declaration */ 1082 error(54); 1083 } else { 1084 /* trailing ',' prohibited in enum declaration */ 1085 c99ism(54); 1086 } 1087 $$ = $1; 1088 } 1089 ; 1090 1091 enumerator_list: /* C99 6.7.2.2 */ 1092 enumerator 1093 | enumerator_list T_COMMA enumerator { 1094 $$ = concat_lists($1, $3); 1095 } 1096 | error { 1097 $$ = NULL; 1098 } 1099 ; 1100 1101 enumerator: /* C99 6.7.2.2 */ 1102 identifier_sym gcc_attribute_specifier_list_opt { 1103 $$ = enumeration_constant($1, enumval, true); 1104 } 1105 | identifier_sym gcc_attribute_specifier_list_opt 1106 T_ASSIGN constant_expr { 1107 $$ = enumeration_constant($1, to_int_constant($4, true), 1108 false); 1109 } 1110 ; 1111 1112 type_qualifier: /* C99 6.7.3 */ 1113 T_QUAL 1114 | atomic { 1115 $$ = ATOMIC; 1116 } 1117 ; 1118 1119 atomic: /* helper */ 1120 T_ATOMIC { 1121 /* TODO: First fix c11ism, then use it here. */ 1122 if (!allow_c11) 1123 /* '_Atomic' requires C11 or later */ 1124 error(350); 1125 } 1126 ; 1127 1128 pointer: /* C99 6.7.5 */ 1129 asterisk type_qualifier_list_opt { 1130 $$ = merge_qualified_pointer($1, $2); 1131 } 1132 | asterisk type_qualifier_list_opt pointer { 1133 $$ = merge_qualified_pointer($1, $2); 1134 $$ = merge_qualified_pointer($$, $3); 1135 } 1136 ; 1137 1138 asterisk: /* helper for 'pointer' */ 1139 T_ASTERISK { 1140 $$ = xcalloc(1, sizeof(*$$)); 1141 $$->p_pointer = true; 1142 } 1143 ; 1144 1145 type_qualifier_list_opt: /* see C99 6.7.5 */ 1146 /* empty */ { 1147 $$ = NULL; 1148 } 1149 | type_qualifier_list 1150 ; 1151 1152 type_qualifier_list: /* C99 6.7.5 */ 1153 type_qualifier_list_elem 1154 | type_qualifier_list type_qualifier_list_elem { 1155 $$ = merge_qualified_pointer($1, $2); 1156 } 1157 ; 1158 1159 type_qualifier_list_elem: /* helper for 'pointer' */ 1160 type_qualifier { 1161 $$ = xcalloc(1, sizeof(*$$)); 1162 if ($1 == CONST) 1163 $$->p_const = true; 1164 if ($1 == VOLATILE) 1165 $$->p_volatile = true; 1166 } 1167 ; 1168 1169 /* 1170 * For an explanation of 'notype' in the following rules, see 1171 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1172 */ 1173 1174 notype_init_declarators: 1175 notype_init_declarator 1176 | notype_init_declarators T_COMMA type_init_declarator 1177 ; 1178 1179 type_init_declarators: 1180 type_init_declarator 1181 | type_init_declarators T_COMMA type_init_declarator 1182 ; 1183 1184 notype_init_declarator: 1185 notype_declarator asm_or_symbolrename_opt { 1186 cgram_declare($1, false, $2); 1187 check_size($1); 1188 } 1189 | notype_declarator asm_or_symbolrename_opt { 1190 begin_initialization($1); 1191 cgram_declare($1, true, $2); 1192 } T_ASSIGN initializer { 1193 check_size($1); 1194 end_initialization(); 1195 } 1196 ; 1197 1198 type_init_declarator: 1199 type_declarator asm_or_symbolrename_opt { 1200 cgram_declare($1, false, $2); 1201 check_size($1); 1202 } 1203 | type_declarator asm_or_symbolrename_opt { 1204 begin_initialization($1); 1205 cgram_declare($1, true, $2); 1206 } T_ASSIGN initializer { 1207 check_size($1); 1208 end_initialization(); 1209 } 1210 ; 1211 1212 notype_declarator: 1213 notype_direct_declarator 1214 | pointer notype_direct_declarator { 1215 $$ = add_pointer($2, $1); 1216 } 1217 ; 1218 1219 type_declarator: 1220 type_direct_declarator 1221 | pointer type_direct_declarator { 1222 $$ = add_pointer($2, $1); 1223 } 1224 ; 1225 1226 notype_direct_declarator: 1227 type_attribute_list_opt T_NAME { 1228 $$ = declarator_name(getsym($2)); 1229 } 1230 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1231 $$ = $3; 1232 } 1233 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1234 $$ = add_array($1, $3.has_dim, $3.dim); 1235 } 1236 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1237 $$ = add_function(symbolrename($1, $3), $2); 1238 end_declaration_level(); 1239 block_level--; 1240 } 1241 | notype_direct_declarator type_attribute 1242 ; 1243 1244 type_direct_declarator: 1245 type_attribute_list_opt identifier { 1246 $$ = declarator_name(getsym($2)); 1247 } 1248 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1249 $$ = $3; 1250 } 1251 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1252 $$ = add_array($1, $3.has_dim, $3.dim); 1253 } 1254 | type_direct_declarator param_list asm_or_symbolrename_opt { 1255 $$ = add_function(symbolrename($1, $3), $2); 1256 end_declaration_level(); 1257 block_level--; 1258 } 1259 | type_direct_declarator type_attribute 1260 ; 1261 1262 /* 1263 * The two distinct rules type_param_declarator and notype_param_declarator 1264 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1265 * always treated as a typename, not an argument name. For example, after 1266 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1267 * "f(int (double));", not "f(int a);". 1268 */ 1269 type_param_declarator: 1270 direct_param_declarator 1271 | pointer direct_param_declarator { 1272 $$ = add_pointer($2, $1); 1273 } 1274 ; 1275 1276 notype_param_declarator: 1277 direct_notype_param_declarator 1278 | pointer direct_notype_param_declarator { 1279 $$ = add_pointer($2, $1); 1280 } 1281 ; 1282 1283 direct_param_declarator: 1284 identifier type_attribute_list { 1285 $$ = declarator_name(getsym($1)); 1286 } 1287 | identifier { 1288 $$ = declarator_name(getsym($1)); 1289 } 1290 | T_LPAREN notype_param_declarator T_RPAREN { 1291 $$ = $2; 1292 } 1293 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1294 gcc_attribute_specifier_list_opt { 1295 $$ = add_array($1, $3.has_dim, $3.dim); 1296 } 1297 | direct_param_declarator param_list asm_or_symbolrename_opt { 1298 $$ = add_function(symbolrename($1, $3), $2); 1299 end_declaration_level(); 1300 block_level--; 1301 } 1302 ; 1303 1304 direct_notype_param_declarator: 1305 identifier { 1306 $$ = declarator_name(getsym($1)); 1307 } 1308 | T_LPAREN notype_param_declarator T_RPAREN { 1309 $$ = $2; 1310 } 1311 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1312 $$ = add_array($1, $3.has_dim, $3.dim); 1313 } 1314 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1315 $$ = add_function(symbolrename($1, $3), $2); 1316 end_declaration_level(); 1317 block_level--; 1318 } 1319 ; 1320 1321 param_list: 1322 id_list_lparen identifier_list T_RPAREN { 1323 $$ = $2; 1324 } 1325 | abstract_decl_param_list 1326 ; 1327 1328 id_list_lparen: 1329 T_LPAREN { 1330 block_level++; 1331 begin_declaration_level(DK_PROTO_ARG); 1332 } 1333 ; 1334 1335 array_size_opt: 1336 /* empty */ { 1337 $$.has_dim = false; 1338 $$.dim = 0; 1339 } 1340 | T_ASTERISK { 1341 /* since C99; variable length array of unspecified size */ 1342 $$.has_dim = false; /* TODO: maybe change to true */ 1343 $$.dim = 0; /* just as a placeholder */ 1344 } 1345 | array_size { 1346 $$.has_dim = true; 1347 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1348 } 1349 ; 1350 1351 array_size: 1352 type_qualifier_list_opt T_SCLASS constant_expr { 1353 /* C11 6.7.6.3p7 */ 1354 if ($2 != STATIC) 1355 yyerror("Bad attribute"); 1356 /* static array size is a C11 extension */ 1357 c11ism(343); 1358 $$ = $3; 1359 } 1360 | type_qualifier { 1361 /* C11 6.7.6.2 */ 1362 if ($1 != RESTRICT) 1363 yyerror("Bad attribute"); 1364 $$ = NULL; 1365 } 1366 | constant_expr 1367 ; 1368 1369 identifier_list: /* C99 6.7.5 */ 1370 T_NAME { 1371 $$ = old_style_function_name(getsym($1)); 1372 } 1373 | identifier_list T_COMMA T_NAME { 1374 $$ = concat_lists($1, old_style_function_name(getsym($3))); 1375 } 1376 | identifier_list error 1377 ; 1378 1379 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1380 type_name: /* C99 6.7.6 */ 1381 { 1382 begin_declaration_level(DK_ABSTRACT); 1383 } abstract_declaration { 1384 end_declaration_level(); 1385 $$ = $2->s_type; 1386 } 1387 ; 1388 1389 abstract_declaration: /* specific to lint */ 1390 begin_type_qualifier_list end_type { 1391 $$ = declare_abstract_type(abstract_name()); 1392 } 1393 | begin_type_specifier_qualifier_list end_type { 1394 $$ = declare_abstract_type(abstract_name()); 1395 } 1396 | begin_type_qualifier_list end_type abstract_declarator { 1397 $$ = declare_abstract_type($3); 1398 } 1399 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1400 $$ = declare_abstract_type($3); 1401 } 1402 ; 1403 1404 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1405 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1406 abstract_declarator: 1407 pointer { 1408 $$ = add_pointer(abstract_name(), $1); 1409 } 1410 | direct_abstract_declarator 1411 | pointer direct_abstract_declarator { 1412 $$ = add_pointer($2, $1); 1413 } 1414 | type_attribute_list direct_abstract_declarator { 1415 $$ = $2; 1416 } 1417 | pointer type_attribute_list direct_abstract_declarator { 1418 $$ = add_pointer($3, $1); 1419 } 1420 ; 1421 1422 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1423 direct_abstract_declarator: 1424 /* TODO: sort rules according to C99 */ 1425 T_LPAREN abstract_declarator T_RPAREN { 1426 $$ = $2; 1427 } 1428 | T_LBRACK array_size_opt T_RBRACK { 1429 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1430 } 1431 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1432 $$ = add_array($1, $3.has_dim, $3.dim); 1433 } 1434 | abstract_decl_param_list asm_or_symbolrename_opt { 1435 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1436 end_declaration_level(); 1437 block_level--; 1438 } 1439 | direct_abstract_declarator abstract_decl_param_list 1440 asm_or_symbolrename_opt { 1441 $$ = add_function(symbolrename($1, $3), $2); 1442 end_declaration_level(); 1443 block_level--; 1444 } 1445 | direct_abstract_declarator type_attribute_list 1446 ; 1447 1448 abstract_decl_param_list: /* specific to lint */ 1449 abstract_decl_lparen T_RPAREN type_attribute_opt { 1450 $$ = NULL; 1451 } 1452 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1453 type_attribute_opt { 1454 dcs->d_prototype = true; 1455 $$ = $2; 1456 } 1457 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1458 $$ = NULL; 1459 } 1460 ; 1461 1462 abstract_decl_lparen: /* specific to lint */ 1463 T_LPAREN { 1464 block_level++; 1465 begin_declaration_level(DK_PROTO_ARG); 1466 } 1467 ; 1468 1469 vararg_parameter_type_list: /* specific to lint */ 1470 parameter_type_list 1471 | parameter_type_list T_COMMA T_ELLIPSIS { 1472 dcs->d_vararg = true; 1473 $$ = $1; 1474 } 1475 | T_ELLIPSIS { 1476 /* TODO: C99 6.7.5 makes this an error as well. */ 1477 if (!allow_trad && !allow_c99) { 1478 /* ANSI C requires formal parameter before '...' */ 1479 error(84); 1480 } else if (allow_c90) { 1481 /* ANSI C requires formal parameter before '...' */ 1482 warning(84); 1483 } 1484 dcs->d_vararg = true; 1485 $$ = NULL; 1486 } 1487 ; 1488 1489 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1490 parameter_type_list: 1491 parameter_declaration 1492 | parameter_type_list T_COMMA parameter_declaration { 1493 $$ = concat_lists($1, $3); 1494 } 1495 ; 1496 1497 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1498 parameter_declaration: 1499 begin_type_declmods end_type { 1500 /* ^^ There is no check for the missing type-specifier. */ 1501 $$ = declare_argument(abstract_name(), false); 1502 } 1503 | begin_type_declaration_specifiers end_type { 1504 $$ = declare_argument(abstract_name(), false); 1505 } 1506 | begin_type_declmods end_type notype_param_declarator { 1507 /* ^^ There is no check for the missing type-specifier. */ 1508 $$ = declare_argument($3, false); 1509 } 1510 /* 1511 * type_param_declarator is needed because of following conflict: 1512 * "typedef int a; f(int (a));" could be parsed as 1513 * "function with argument a of type int", or 1514 * "function with an abstract argument of type function". 1515 * This grammar realizes the second case. 1516 */ 1517 | begin_type_declaration_specifiers end_type type_param_declarator { 1518 $$ = declare_argument($3, false); 1519 } 1520 | begin_type_declmods end_type abstract_declarator { 1521 /* ^^ There is no check for the missing type-specifier. */ 1522 $$ = declare_argument($3, false); 1523 } 1524 | begin_type_declaration_specifiers end_type abstract_declarator { 1525 $$ = declare_argument($3, false); 1526 } 1527 ; 1528 1529 initializer: /* C99 6.7.8 "Initialization" */ 1530 assignment_expression { 1531 init_expr($1); 1532 } 1533 | init_lbrace init_rbrace { 1534 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1535 } 1536 | init_lbrace initializer_list comma_opt init_rbrace 1537 /* XXX: What is this error handling for? */ 1538 | error 1539 ; 1540 1541 initializer_list: /* C99 6.7.8 "Initialization" */ 1542 initializer_list_item 1543 | initializer_list T_COMMA initializer_list_item 1544 ; 1545 1546 initializer_list_item: /* helper */ 1547 designation initializer 1548 | initializer 1549 ; 1550 1551 designation: /* C99 6.7.8 "Initialization" */ 1552 begin_designation designator_list T_ASSIGN 1553 | identifier T_COLON { 1554 /* GCC style struct or union member name in initializer */ 1555 gnuism(315); 1556 begin_designation(); 1557 add_designator_member($1); 1558 } 1559 ; 1560 1561 begin_designation: /* lint-specific helper */ 1562 /* empty */ { 1563 begin_designation(); 1564 } 1565 ; 1566 1567 designator_list: /* C99 6.7.8 "Initialization" */ 1568 designator 1569 | designator_list designator 1570 ; 1571 1572 designator: /* C99 6.7.8 "Initialization" */ 1573 T_LBRACK range T_RBRACK { 1574 if (!allow_c99) 1575 /* array initializer with designators is a C99 ... */ 1576 warning(321); 1577 add_designator_subscript($2); 1578 } 1579 | T_POINT identifier { 1580 if (!allow_c99) 1581 /* struct or union member name in initializer is ... */ 1582 warning(313); 1583 add_designator_member($2); 1584 } 1585 ; 1586 1587 static_assert_declaration: 1588 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1589 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1590 ; 1591 1592 range: 1593 constant_expr { 1594 $$.lo = to_int_constant($1, true); 1595 $$.hi = $$.lo; 1596 } 1597 | constant_expr T_ELLIPSIS constant_expr { 1598 $$.lo = to_int_constant($1, true); 1599 $$.hi = to_int_constant($3, true); 1600 /* initialization with '[a...b]' is a GCC extension */ 1601 gnuism(340); 1602 } 1603 ; 1604 1605 init_lbrace: /* helper */ 1606 T_LBRACE { 1607 init_lbrace(); 1608 } 1609 ; 1610 1611 init_rbrace: /* helper */ 1612 T_RBRACE { 1613 init_rbrace(); 1614 } 1615 ; 1616 1617 asm_or_symbolrename_opt: /* GCC extensions */ 1618 /* empty */ { 1619 $$ = NULL; 1620 } 1621 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1622 freeyyv(&$3, T_STRING); 1623 $$ = NULL; 1624 } 1625 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1626 gcc_attribute_specifier_list_opt { 1627 $$ = $3; 1628 } 1629 ; 1630 1631 statement: /* C99 6.8 */ 1632 expression_statement 1633 | non_expr_statement 1634 ; 1635 1636 non_expr_statement: /* helper for C99 6.8 */ 1637 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1638 | labeled_statement 1639 | compound_statement 1640 | selection_statement 1641 | iteration_statement 1642 | jump_statement { 1643 seen_fallthrough = false; 1644 } 1645 | asm_statement 1646 ; 1647 1648 labeled_statement: /* C99 6.8.1 */ 1649 label gcc_attribute_specifier_list_opt statement 1650 ; 1651 1652 label: 1653 T_NAME T_COLON { 1654 symtyp = FLABEL; 1655 named_label(getsym($1)); 1656 } 1657 | T_CASE constant_expr T_COLON { 1658 case_label($2); 1659 seen_fallthrough = true; 1660 } 1661 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1662 /* XXX: We don't fill all cases */ 1663 case_label($2); 1664 seen_fallthrough = true; 1665 } 1666 | T_DEFAULT T_COLON { 1667 default_label(); 1668 seen_fallthrough = true; 1669 } 1670 ; 1671 1672 compound_statement: /* C99 6.8.2 */ 1673 compound_statement_lbrace compound_statement_rbrace 1674 | compound_statement_lbrace block_item_list compound_statement_rbrace 1675 ; 1676 1677 compound_statement_lbrace: 1678 T_LBRACE { 1679 block_level++; 1680 mem_block_level++; 1681 begin_declaration_level(DK_AUTO); 1682 } 1683 ; 1684 1685 compound_statement_rbrace: 1686 T_RBRACE { 1687 end_declaration_level(); 1688 level_free_all(mem_block_level); 1689 mem_block_level--; 1690 block_level--; 1691 seen_fallthrough = false; 1692 } 1693 ; 1694 1695 block_item_list: /* C99 6.8.2 */ 1696 block_item 1697 | block_item_list block_item { 1698 if ($1 && !$2) 1699 /* declarations after statements is a C99 feature */ 1700 c99ism(327); 1701 $$ = $1 || $2; 1702 } 1703 ; 1704 1705 block_item: /* C99 6.8.2 */ 1706 declaration_or_error { 1707 $$ = false; 1708 restore_warning_flags(); 1709 } 1710 | statement { 1711 $$ = true; 1712 restore_warning_flags(); 1713 } 1714 ; 1715 1716 expression_statement: /* C99 6.8.3 */ 1717 expression T_SEMI { 1718 expr($1, false, false, false, false); 1719 seen_fallthrough = false; 1720 } 1721 | T_SEMI { 1722 check_statement_reachable(); 1723 seen_fallthrough = false; 1724 } 1725 ; 1726 1727 selection_statement: /* C99 6.8.4 */ 1728 if_without_else %prec T_THEN { 1729 save_warning_flags(); 1730 stmt_if_then_stmt(); 1731 stmt_if_else_stmt(false); 1732 } 1733 | if_without_else T_ELSE { 1734 save_warning_flags(); 1735 stmt_if_then_stmt(); 1736 } statement { 1737 clear_warning_flags(); 1738 stmt_if_else_stmt(true); 1739 } 1740 | if_without_else T_ELSE error { 1741 clear_warning_flags(); 1742 stmt_if_else_stmt(false); 1743 } 1744 | switch_expr statement { 1745 clear_warning_flags(); 1746 stmt_switch_expr_stmt(); 1747 } 1748 | switch_expr error { 1749 clear_warning_flags(); 1750 stmt_switch_expr_stmt(); 1751 } 1752 ; 1753 1754 if_without_else: /* see C99 6.8.4 */ 1755 if_expr statement 1756 | if_expr error 1757 ; 1758 1759 if_expr: /* see C99 6.8.4 */ 1760 T_IF T_LPAREN expression T_RPAREN { 1761 stmt_if_expr($3); 1762 clear_warning_flags(); 1763 } 1764 ; 1765 1766 switch_expr: /* see C99 6.8.4 */ 1767 T_SWITCH T_LPAREN expression T_RPAREN { 1768 stmt_switch_expr($3); 1769 clear_warning_flags(); 1770 } 1771 ; 1772 1773 iteration_statement: /* C99 6.8.5 */ 1774 while_expr statement { 1775 clear_warning_flags(); 1776 stmt_while_expr_stmt(); 1777 } 1778 | while_expr error { 1779 clear_warning_flags(); 1780 stmt_while_expr_stmt(); 1781 } 1782 | do_statement do_while_expr { 1783 stmt_do_while_expr($2); 1784 seen_fallthrough = false; 1785 } 1786 | do error { 1787 clear_warning_flags(); 1788 stmt_do_while_expr(NULL); 1789 } 1790 | for_exprs statement { 1791 clear_warning_flags(); 1792 stmt_for_exprs_stmt(); 1793 end_declaration_level(); 1794 block_level--; 1795 } 1796 | for_exprs error { 1797 clear_warning_flags(); 1798 stmt_for_exprs_stmt(); 1799 end_declaration_level(); 1800 block_level--; 1801 } 1802 ; 1803 1804 while_expr: /* see C99 6.8.5 */ 1805 T_WHILE T_LPAREN expression T_RPAREN { 1806 stmt_while_expr($3); 1807 clear_warning_flags(); 1808 } 1809 ; 1810 1811 do_statement: /* see C99 6.8.5 */ 1812 do statement { 1813 clear_warning_flags(); 1814 } 1815 ; 1816 1817 do: /* see C99 6.8.5 */ 1818 T_DO { 1819 stmt_do(); 1820 } 1821 ; 1822 1823 do_while_expr: /* see C99 6.8.5 */ 1824 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1825 $$ = $3; 1826 } 1827 ; 1828 1829 for_start: /* see C99 6.8.5 */ 1830 T_FOR T_LPAREN { 1831 begin_declaration_level(DK_AUTO); 1832 block_level++; 1833 } 1834 ; 1835 1836 for_exprs: /* see C99 6.8.5 */ 1837 for_start 1838 begin_type_declaration_specifiers end_type 1839 notype_init_declarators T_SEMI 1840 expression_opt T_SEMI 1841 expression_opt T_RPAREN { 1842 /* variable declaration in for loop */ 1843 c99ism(325); 1844 stmt_for_exprs(NULL, $6, $8); 1845 clear_warning_flags(); 1846 } 1847 | for_start 1848 expression_opt T_SEMI 1849 expression_opt T_SEMI 1850 expression_opt T_RPAREN { 1851 stmt_for_exprs($2, $4, $6); 1852 clear_warning_flags(); 1853 } 1854 ; 1855 1856 jump_statement: /* C99 6.8.6 */ 1857 goto identifier T_SEMI { 1858 stmt_goto(getsym($2)); 1859 } 1860 | goto error T_SEMI { 1861 symtyp = FVFT; 1862 } 1863 | T_CONTINUE T_SEMI { 1864 stmt_continue(); 1865 } 1866 | T_BREAK T_SEMI { 1867 stmt_break(); 1868 } 1869 | T_RETURN sys T_SEMI { 1870 stmt_return($2, NULL); 1871 } 1872 | T_RETURN sys expression T_SEMI { 1873 stmt_return($2, $3); 1874 } 1875 ; 1876 1877 goto: /* see C99 6.8.6 */ 1878 T_GOTO { 1879 symtyp = FLABEL; 1880 } 1881 ; 1882 1883 asm_statement: /* GCC extension */ 1884 T_ASM T_LPAREN read_until_rparen T_SEMI { 1885 dcs_set_asm(); 1886 } 1887 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 1888 dcs_set_asm(); 1889 } 1890 | T_ASM error 1891 ; 1892 1893 read_until_rparen: /* helper for 'asm_statement' */ 1894 /* empty */ { 1895 read_until_rparen(); 1896 } 1897 ; 1898 1899 translation_unit: /* C99 6.9 */ 1900 external_declaration 1901 | translation_unit external_declaration 1902 ; 1903 1904 external_declaration: /* C99 6.9 */ 1905 function_definition { 1906 global_clean_up_decl(false); 1907 clear_warning_flags(); 1908 } 1909 | top_level_declaration { 1910 global_clean_up_decl(false); 1911 clear_warning_flags(); 1912 } 1913 | asm_statement /* GCC extension */ 1914 | T_SEMI { /* GCC extension */ 1915 /* 1916 * TODO: Only allow this in GCC mode, not in plain C99. 1917 * This is one of the top 10 warnings in the NetBSD build. 1918 */ 1919 if (!allow_trad && !allow_c99) { 1920 /* empty declaration */ 1921 error(0); 1922 } else if (allow_c90) { 1923 /* empty declaration */ 1924 warning(0); 1925 } 1926 } 1927 ; 1928 1929 /* 1930 * On the top level, lint allows several forms of declarations that it doesn't 1931 * allow in functions. For example, a single ';' is an empty declaration and 1932 * is supported by some compilers, but in a function it would be an empty 1933 * statement, not a declaration. This makes a difference in C90 mode, where 1934 * a statement must not be followed by a declaration. 1935 * 1936 * See 'declaration' for all other declarations. 1937 */ 1938 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1939 begin_type end_type notype_init_declarators T_SEMI { 1940 /* TODO: Make this an error in C99 mode as well. */ 1941 if (!allow_trad && !allow_c99) { 1942 /* old-style declaration; add 'int' */ 1943 error(1); 1944 } else if (allow_c90) { 1945 /* old-style declaration; add 'int' */ 1946 warning(1); 1947 } 1948 } 1949 | declaration 1950 | error T_SEMI { 1951 global_clean_up(); 1952 } 1953 | error T_RBRACE { 1954 global_clean_up(); 1955 } 1956 ; 1957 1958 function_definition: /* C99 6.9.1 */ 1959 func_declarator { 1960 if ($1->s_type->t_tspec != FUNC) { 1961 /* syntax error '%s' */ 1962 error(249, yytext); 1963 YYERROR; 1964 } 1965 if ($1->s_type->t_typedef) { 1966 /* ()-less function definition */ 1967 error(64); 1968 YYERROR; 1969 } 1970 begin_function($1); 1971 block_level++; 1972 begin_declaration_level(DK_OLD_STYLE_ARG); 1973 if (lwarn == LWARN_NONE) 1974 $1->s_used = true; 1975 } arg_declaration_list_opt { 1976 end_declaration_level(); 1977 block_level--; 1978 check_func_lint_directives(); 1979 check_func_old_style_arguments(); 1980 begin_control_statement(CS_FUNCTION_BODY); 1981 } compound_statement { 1982 end_function(); 1983 end_control_statement(CS_FUNCTION_BODY); 1984 } 1985 ; 1986 1987 func_declarator: 1988 begin_type end_type notype_declarator { 1989 if (!allow_trad) { 1990 /* old-style declaration; add 'int' */ 1991 error(1); 1992 } 1993 $$ = $3; 1994 } 1995 | begin_type_declmods end_type notype_declarator { 1996 if (!allow_trad) { 1997 /* old-style declaration; add 'int' */ 1998 error(1); 1999 } 2000 $$ = $3; 2001 } 2002 | begin_type_declaration_specifiers end_type type_declarator { 2003 $$ = $3; 2004 } 2005 ; 2006 2007 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2008 /* empty */ 2009 | arg_declaration_list 2010 ; 2011 2012 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2013 arg_declaration 2014 | arg_declaration_list arg_declaration 2015 /* XXX or better "arg_declaration error" ? */ 2016 | error 2017 ; 2018 2019 /* 2020 * "arg_declaration" is separated from "declaration" because it 2021 * needs other error handling. 2022 */ 2023 arg_declaration: 2024 begin_type_declmods end_type T_SEMI { 2025 /* empty declaration */ 2026 warning(2); 2027 } 2028 | begin_type_declmods end_type notype_init_declarators T_SEMI 2029 | begin_type_declaration_specifiers end_type T_SEMI { 2030 if (!dcs->d_nonempty_decl) { 2031 /* empty declaration */ 2032 warning(2); 2033 } else { 2034 /* '%s' declared in argument declaration list */ 2035 warning(3, type_name(dcs->d_type)); 2036 } 2037 } 2038 | begin_type_declaration_specifiers end_type 2039 type_init_declarators T_SEMI { 2040 if (dcs->d_nonempty_decl) { 2041 /* '%s' declared in argument declaration list */ 2042 warning(3, type_name(dcs->d_type)); 2043 } 2044 } 2045 | begin_type_declmods error 2046 | begin_type_declaration_specifiers error 2047 ; 2048 2049 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2050 gcc_attribute_specifier_list_opt: 2051 /* empty */ 2052 | gcc_attribute_specifier_list 2053 ; 2054 2055 gcc_attribute_specifier_list: 2056 gcc_attribute_specifier 2057 | gcc_attribute_specifier_list gcc_attribute_specifier 2058 ; 2059 2060 gcc_attribute_specifier: 2061 T_ATTRIBUTE T_LPAREN T_LPAREN { 2062 in_gcc_attribute = true; 2063 } gcc_attribute_list { 2064 in_gcc_attribute = false; 2065 } T_RPAREN T_RPAREN 2066 ; 2067 2068 gcc_attribute_list: 2069 gcc_attribute 2070 | gcc_attribute_list T_COMMA gcc_attribute 2071 ; 2072 2073 gcc_attribute: 2074 /* empty */ 2075 | T_NAME { 2076 const char *name = $1->sb_name; 2077 if (is_either(name, "packed", "__packed__")) 2078 dcs_add_packed(); 2079 else if (is_either(name, "used", "__used__") || 2080 is_either(name, "unused", "__unused__")) 2081 dcs_set_used(); 2082 else if (is_either(name, "fallthrough", "__fallthrough__")) 2083 fallthru(1); 2084 } 2085 | T_NAME T_LPAREN T_RPAREN 2086 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2087 | type_qualifier { 2088 if ($1 != CONST) 2089 yyerror("Bad attribute"); 2090 } 2091 ; 2092 2093 gcc_attribute_parameters: 2094 constant_expr 2095 | gcc_attribute_parameters T_COMMA constant_expr 2096 ; 2097 2098 sys: 2099 /* empty */ { 2100 $$ = in_system_header; 2101 } 2102 ; 2103 2104 %% 2105 2106 /* ARGSUSED */ 2107 int 2108 yyerror(const char *msg) 2109 { 2110 /* syntax error '%s' */ 2111 error(249, yytext); 2112 if (++sytxerr >= 5) 2113 norecover(); 2114 return 0; 2115 } 2116 2117 #if YYDEBUG && (YYBYACC || YYBISON) 2118 static const char * 2119 cgram_to_string(int token, YYSTYPE val) 2120 { 2121 2122 switch (token) { 2123 case T_INCDEC: 2124 case T_MULTIPLICATIVE: 2125 case T_ADDITIVE: 2126 case T_SHIFT: 2127 case T_RELATIONAL: 2128 case T_EQUALITY: 2129 case T_OPASSIGN: 2130 return modtab[val.y_op].m_name; 2131 case T_SCLASS: 2132 return scl_name(val.y_scl); 2133 case T_TYPE: 2134 case T_STRUCT_OR_UNION: 2135 return tspec_name(val.y_tspec); 2136 case T_QUAL: 2137 return tqual_name(val.y_tqual); 2138 case T_NAME: 2139 return val.y_name->sb_name; 2140 default: 2141 return "<none>"; 2142 } 2143 } 2144 #endif 2145 2146 #if YYDEBUG && YYBISON 2147 static inline void 2148 cgram_print(FILE *output, int token, YYSTYPE val) 2149 { 2150 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2151 } 2152 #endif 2153 2154 static void 2155 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2156 { 2157 declare(decl, has_initializer, renaming); 2158 if (renaming != NULL) 2159 freeyyv(&renaming, T_NAME); 2160 } 2161 2162 /* 2163 * Discard all input tokens up to and including the next 2164 * unmatched right paren 2165 */ 2166 static void 2167 read_until_rparen(void) 2168 { 2169 int level; 2170 2171 if (yychar < 0) 2172 yychar = yylex(); 2173 freeyyv(&yylval, yychar); 2174 2175 level = 1; 2176 while (yychar > 0) { 2177 if (yychar == T_LPAREN) 2178 level++; 2179 if (yychar == T_RPAREN && --level == 0) 2180 break; 2181 freeyyv(&yylval, yychar = yylex()); 2182 } 2183 2184 yyclearin; 2185 } 2186 2187 static sym_t * 2188 symbolrename(sym_t *s, sbuf_t *sb) 2189 { 2190 if (sb != NULL) 2191 s->s_rename = sb->sb_name; 2192 return s; 2193 } 2194
Indexes created Tue Oct 07 21:09:53 GMT 2025