cgram.y revision 1.452
1 %{ 2 /* $NetBSD: cgram.y,v 1.452 2023/07/10 19:58:47 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 1.452 2023/07/10 19:58:47 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 130 #define YYSTYPE_TOSTRING cgram_to_string 131 #endif 132 133 %} 134 135 %expect 131 136 137 %union { 138 val_t *y_val; 139 sbuf_t *y_name; 140 sym_t *y_sym; 141 op_t y_op; 142 scl_t y_scl; 143 tspec_t y_tspec; 144 tqual_t y_tqual; 145 type_t *y_type; 146 tnode_t *y_tnode; 147 range_t y_range; 148 strg_t *y_string; 149 qual_ptr *y_qual_ptr; 150 bool y_seen_statement; 151 struct generic_association *y_generic; 152 struct array_size y_array_size; 153 bool y_in_system_header; 154 }; 155 156 /* for Bison: 157 %printer { 158 if (is_integer($$->v_tspec)) 159 fprintf(yyo, "%lld", (unsigned long long)$$->u.integer); 160 else 161 fprintf(yyo, "%Lg", $$->u.floating); 162 } <y_val> 163 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 164 %printer { debug_sym("", $$, ""); } <y_sym> 165 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 166 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 167 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 168 %printer { fprintf(yyo, "%s", tqual_name($$)); } <y_tqual> 169 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 170 %printer { 171 if ($$ == NULL) 172 fprintf(yyo, "<null>"); 173 else 174 fprintf(yyo, "%s '%s'", 175 op_name($$->tn_op), type_name($$->tn_type)); 176 } <y_tnode> 177 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 178 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 179 %printer { 180 fprintf(yyo, "%s%s%s", 181 $$->p_const ? "const " : "", 182 $$->p_volatile ? "volatile " : "", 183 $$->p_pointer ? "*" : ""); 184 } <y_qual_ptr> 185 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 186 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 187 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 188 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 189 */ 190 191 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 192 %token T_POINT T_ARROW 193 %token T_COMPLEMENT T_LOGNOT 194 %token <y_op> T_INCDEC 195 %token T_SIZEOF 196 %token T_BUILTIN_OFFSETOF 197 %token T_TYPEOF 198 %token T_EXTENSION 199 %token T_ALIGNAS 200 %token T_ALIGNOF 201 %token T_ASTERISK 202 %token <y_op> T_MULTIPLICATIVE 203 %token <y_op> T_ADDITIVE 204 %token <y_op> T_SHIFT 205 %token <y_op> T_RELATIONAL 206 %token <y_op> T_EQUALITY 207 %token T_AMPER 208 %token T_BITXOR 209 %token T_BITOR 210 %token T_LOGAND 211 %token T_LOGOR 212 %token T_QUEST 213 %token T_COLON 214 %token T_ASSIGN 215 %token <y_op> T_OPASSIGN 216 %token T_COMMA 217 %token T_SEMI 218 %token T_ELLIPSIS 219 %token T_REAL 220 %token T_IMAG 221 %token T_GENERIC 222 %token T_NORETURN 223 224 /* storage classes (extern, static, auto, register and typedef) */ 225 %token <y_scl> T_SCLASS 226 227 /* 228 * predefined type keywords (char, int, short, long, unsigned, signed, 229 * float, double, void); see T_TYPENAME for types from typedef 230 */ 231 %token <y_tspec> T_TYPE 232 233 /* qualifiers (const, volatile, restrict, _Thread_local) */ 234 %token <y_tqual> T_QUAL 235 %token <y_tqual> T_ATOMIC 236 237 /* struct or union */ 238 %token <y_tspec> T_STRUCT_OR_UNION 239 240 /* remaining keywords */ 241 %token T_ASM 242 %token T_BREAK 243 %token T_CASE 244 %token T_CONTINUE 245 %token T_DEFAULT 246 %token T_DO 247 %token T_ELSE 248 %token T_ENUM 249 %token T_FOR 250 %token T_GOTO 251 %token T_IF 252 %token T_PACKED 253 %token T_RETURN 254 %token T_SWITCH 255 %token T_SYMBOLRENAME 256 %token T_WHILE 257 %token T_STATIC_ASSERT 258 259 %token T_ATTRIBUTE 260 261 %left T_THEN 262 %left T_ELSE 263 %right T_QUEST T_COLON 264 %left T_LOGOR 265 %left T_LOGAND 266 %left T_BITOR 267 %left T_BITXOR 268 %left T_AMPER 269 %left T_EQUALITY 270 %left T_RELATIONAL 271 %left T_SHIFT 272 %left T_ADDITIVE 273 %left T_ASTERISK T_MULTIPLICATIVE 274 275 %token <y_name> T_NAME 276 %token <y_name> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 /* No type for program. */ 281 %type <y_sym> identifier_sym 282 %type <y_name> identifier 283 %type <y_string> string 284 %type <y_tnode> primary_expression 285 %type <y_tnode> generic_selection 286 %type <y_generic> generic_assoc_list 287 %type <y_generic> generic_association 288 %type <y_tnode> postfix_expression 289 /* No type for comma_opt. */ 290 %type <y_tnode> gcc_statement_expr_list 291 %type <y_tnode> gcc_statement_expr_item 292 %type <y_op> point_or_arrow 293 %type <y_tnode> argument_expression_list 294 %type <y_tnode> unary_expression 295 %type <y_tnode> cast_expression 296 %type <y_tnode> expression_opt 297 %type <y_tnode> conditional_expression 298 %type <y_tnode> assignment_expression 299 %type <y_tnode> expression 300 %type <y_tnode> constant_expr 301 /* No type for declaration_or_error. */ 302 /* No type for declaration. */ 303 /* No type for begin_type_declaration_specifiers. */ 304 /* No type for begin_type_declmods. */ 305 /* No type for begin_type_specifier_qualifier_list. */ 306 /* No type for begin_type_specifier_qualifier_list_postfix. */ 307 %type <y_type> begin_type_typespec 308 /* No type for begin_type_qualifier_list. */ 309 /* No type for declmod. */ 310 /* No type for type_attribute_list_opt. */ 311 /* No type for type_attribute_list. */ 312 /* No type for type_attribute_opt. */ 313 /* No type for type_attribute. */ 314 /* No type for begin_type. */ 315 /* No type for end_type. */ 316 %type <y_type> type_specifier 317 %type <y_type> notype_type_specifier 318 %type <y_type> atomic_type_specifier 319 %type <y_type> struct_or_union_specifier 320 %type <y_tspec> struct_or_union 321 %type <y_sym> braced_struct_declaration_list 322 /* No type for struct_declaration_lbrace. */ 323 %type <y_sym> struct_declaration_list_with_rbrace 324 %type <y_sym> struct_declaration_list 325 %type <y_sym> struct_declaration 326 %type <y_sym> notype_struct_declarators 327 %type <y_sym> type_struct_declarators 328 %type <y_sym> notype_struct_declarator 329 %type <y_sym> type_struct_declarator 330 %type <y_type> enum_specifier 331 /* No type for enum. */ 332 %type <y_sym> enum_declaration 333 /* No type for enum_decl_lbrace. */ 334 %type <y_sym> enums_with_opt_comma 335 %type <y_sym> enumerator_list 336 %type <y_sym> enumerator 337 %type <y_tqual> type_qualifier 338 /* No type for atomic. */ 339 %type <y_qual_ptr> pointer 340 %type <y_qual_ptr> asterisk 341 %type <y_qual_ptr> type_qualifier_list_opt 342 %type <y_qual_ptr> type_qualifier_list 343 %type <y_qual_ptr> type_qualifier_list_elem 344 /* No type for notype_init_declarators. */ 345 /* No type for type_init_declarators. */ 346 /* No type for notype_init_declarator. */ 347 /* No type for type_init_declarator. */ 348 %type <y_sym> notype_declarator 349 %type <y_sym> type_declarator 350 %type <y_sym> notype_direct_declarator 351 %type <y_sym> type_direct_declarator 352 %type <y_sym> type_param_declarator 353 %type <y_sym> notype_param_declarator 354 %type <y_sym> direct_param_declarator 355 %type <y_sym> direct_notype_param_declarator 356 %type <y_sym> param_list 357 /* No type for id_list_lparen. */ 358 /* No type for abstract_decl_lparen. */ 359 %type <y_array_size> array_size_opt 360 %type <y_tnode> array_size 361 %type <y_sym> identifier_list 362 %type <y_type> type_name 363 %type <y_sym> abstract_declaration 364 %type <y_sym> abstract_declarator 365 %type <y_sym> direct_abstract_declarator 366 %type <y_sym> abstract_decl_param_list 367 /* No type for abstract_decl_lparen. */ 368 %type <y_sym> vararg_parameter_type_list 369 %type <y_sym> parameter_type_list 370 %type <y_sym> parameter_declaration 371 /* No type for braced_initializer. */ 372 /* No type for initializer. */ 373 /* No type for initializer_list. */ 374 /* No type for initializer_list_item. */ 375 /* No type for designation. */ 376 /* No type for begin_designation. */ 377 /* No type for designator_list. */ 378 /* No type for designator. */ 379 /* No type for static_assert_declaration. */ 380 %type <y_range> range 381 /* No type for init_lbrace. */ 382 /* No type for init_rbrace. */ 383 %type <y_name> asm_or_symbolrename_opt 384 /* No type for statement. */ 385 /* No type for non_expr_statement. */ 386 /* No type for labeled_statement. */ 387 /* No type for label. */ 388 /* No type for compound_statement. */ 389 /* No type for compound_statement_lbrace. */ 390 /* No type for compound_statement_rbrace. */ 391 %type <y_seen_statement> block_item_list 392 %type <y_seen_statement> block_item 393 /* No type for expression_statement. */ 394 /* No type for selection_statement. */ 395 /* No type for if_without_else. */ 396 /* No type for if_expr. */ 397 /* No type for switch_expr. */ 398 /* No type for iteration_statement. */ 399 /* No type for while_expr. */ 400 /* No type for do_statement. */ 401 /* No type for do. */ 402 %type <y_tnode> do_while_expr 403 /* No type for for_start. */ 404 /* No type for for_exprs. */ 405 /* No type for jump_statement. */ 406 /* No type for goto. */ 407 /* No type for asm_statement. */ 408 /* No type for read_until_rparen. */ 409 /* No type for translation_unit. */ 410 /* No type for external_declaration. */ 411 /* No type for top_level_declaration. */ 412 /* No type for function_definition. */ 413 %type <y_sym> func_declarator 414 /* No type for arg_declaration_list_opt. */ 415 /* No type for arg_declaration_list. */ 416 /* No type for arg_declaration. */ 417 /* No type for gcc_attribute_specifier_list_opt. */ 418 /* No type for gcc_attribute_specifier_list. */ 419 /* No type for gcc_attribute_specifier. */ 420 /* No type for gcc_attribute_list. */ 421 /* No type for gcc_attribute. */ 422 /* No type for gcc_attribute_parameters. */ 423 %type <y_in_system_header> sys 424 425 %% 426 427 program: 428 /* empty */ { 429 /* TODO: Make this an error in C99 mode as well. */ 430 if (!allow_trad && !allow_c99) { 431 /* empty translation unit */ 432 error(272); 433 } else if (allow_c90) { 434 /* empty translation unit */ 435 warning(272); 436 } 437 } 438 | translation_unit 439 ; 440 441 identifier_sym: /* helper for struct/union/enum */ 442 identifier { 443 $$ = getsym($1); 444 } 445 ; 446 447 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 448 identifier: 449 T_NAME { 450 debug_step("cgram: name '%s'", $1->sb_name); 451 $$ = $1; 452 } 453 | T_TYPENAME { 454 debug_step("cgram: typename '%s'", $1->sb_name); 455 $$ = $1; 456 } 457 ; 458 459 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 460 string: 461 T_STRING 462 | string T_STRING { 463 if (!allow_c90) { 464 /* concatenated strings are illegal in traditional C */ 465 warning(219); 466 } 467 $$ = cat_strings($1, $2); 468 } 469 ; 470 471 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 472 primary_expression: 473 T_NAME { 474 bool sys_name, sys_next; 475 sys_name = in_system_header; 476 if (yychar < 0) 477 yychar = yylex(); 478 sys_next = in_system_header; 479 in_system_header = sys_name; 480 $$ = build_name(getsym($1), yychar == T_LPAREN); 481 in_system_header = sys_next; 482 } 483 | T_CON { 484 $$ = build_constant(gettyp($1->v_tspec), $1); 485 } 486 | string { 487 $$ = build_string($1); 488 } 489 | T_LPAREN expression T_RPAREN { 490 if ($2 != NULL) 491 $2->tn_parenthesized = true; 492 $$ = $2; 493 } 494 | generic_selection 495 /* GCC primary-expression, see c_parser_postfix_expression */ 496 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 497 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 498 set_symtyp(FMEMBER); 499 $$ = build_offsetof($3, getsym($5)); 500 } 501 ; 502 503 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 504 generic_selection: 505 T_GENERIC T_LPAREN assignment_expression T_COMMA 506 generic_assoc_list T_RPAREN { 507 /* generic selection requires C11 or later */ 508 c11ism(345); 509 $$ = build_generic_selection($3, $5); 510 } 511 ; 512 513 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 514 generic_assoc_list: 515 generic_association 516 | generic_assoc_list T_COMMA generic_association { 517 $3->ga_prev = $1; 518 $$ = $3; 519 } 520 ; 521 522 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 523 generic_association: 524 type_name T_COLON assignment_expression { 525 $$ = block_zero_alloc(sizeof(*$$)); 526 $$->ga_arg = $1; 527 $$->ga_result = $3; 528 } 529 | T_DEFAULT T_COLON assignment_expression { 530 $$ = block_zero_alloc(sizeof(*$$)); 531 $$->ga_arg = NULL; 532 $$->ga_result = $3; 533 } 534 ; 535 536 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 537 postfix_expression: 538 primary_expression 539 | postfix_expression T_LBRACK sys expression T_RBRACK { 540 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 541 } 542 | postfix_expression T_LPAREN sys T_RPAREN { 543 $$ = build_function_call($1, $3, NULL); 544 } 545 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 546 $$ = build_function_call($1, $3, $4); 547 } 548 | postfix_expression point_or_arrow sys T_NAME { 549 $$ = build_member_access($1, $2, $3, $4); 550 } 551 | postfix_expression T_INCDEC sys { 552 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 553 } 554 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 555 sym_t *tmp = mktempsym($2); 556 begin_initialization(tmp); 557 cgram_declare(tmp, true, NULL); 558 } braced_initializer { 559 if (!allow_c99) 560 /* compound literals are a C99/GCC extension */ 561 gnuism(319); 562 $$ = build_name(current_initsym(), false); 563 end_initialization(); 564 } 565 | T_LPAREN compound_statement_lbrace { 566 begin_statement_expr(); 567 } gcc_statement_expr_list { 568 do_statement_expr($4); 569 } compound_statement_rbrace T_RPAREN { 570 $$ = end_statement_expr(); 571 } 572 ; 573 574 comma_opt: /* helper for 'postfix_expression' */ 575 /* empty */ 576 | T_COMMA 577 ; 578 579 /* 580 * The inner part of a GCC statement-expression of the form ({ ... }). 581 * 582 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 583 */ 584 gcc_statement_expr_list: 585 gcc_statement_expr_item 586 | gcc_statement_expr_list gcc_statement_expr_item { 587 $$ = $2; 588 } 589 ; 590 591 gcc_statement_expr_item: 592 declaration_or_error { 593 clear_warning_flags(); 594 $$ = NULL; 595 } 596 | non_expr_statement { 597 $$ = expr_alloc_tnode(); 598 $$->tn_type = gettyp(VOID); 599 } 600 | T_SEMI { 601 $$ = expr_alloc_tnode(); 602 $$->tn_type = gettyp(VOID); 603 } 604 | expression T_SEMI { 605 if ($1 == NULL) { /* in case of syntax errors */ 606 $$ = expr_alloc_tnode(); 607 $$->tn_type = gettyp(VOID); 608 } else { 609 /* XXX: do that only on the last name */ 610 if ($1->tn_op == NAME) 611 $1->tn_sym->s_used = true; 612 expr($1, false, false, false, false); 613 seen_fallthrough = false; 614 $$ = $1; 615 } 616 } 617 ; 618 619 point_or_arrow: /* helper for 'postfix_expression' */ 620 T_POINT { 621 set_symtyp(FMEMBER); 622 $$ = POINT; 623 } 624 | T_ARROW { 625 set_symtyp(FMEMBER); 626 $$ = ARROW; 627 } 628 ; 629 630 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 631 argument_expression_list: 632 assignment_expression { 633 $$ = build_function_argument(NULL, $1); 634 } 635 | argument_expression_list T_COMMA assignment_expression { 636 $$ = build_function_argument($1, $3); 637 } 638 ; 639 640 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 641 unary_expression: 642 postfix_expression 643 | T_INCDEC sys unary_expression { 644 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 645 } 646 | T_AMPER sys cast_expression { 647 $$ = build_unary(ADDR, $2, $3); 648 } 649 | T_ASTERISK sys cast_expression { 650 $$ = build_unary(INDIR, $2, $3); 651 } 652 | T_ADDITIVE sys cast_expression { 653 if (!allow_c90 && $1 == PLUS) { 654 /* unary '+' is illegal in traditional C */ 655 warning(100); 656 } 657 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 658 } 659 | T_COMPLEMENT sys cast_expression { 660 $$ = build_unary(COMPL, $2, $3); 661 } 662 | T_LOGNOT sys cast_expression { 663 $$ = build_unary(NOT, $2, $3); 664 } 665 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 666 $$ = build_unary(REAL, $2, $3); 667 } 668 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 669 $$ = build_unary(IMAG, $2, $3); 670 } 671 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 672 $$ = $2; 673 } 674 | T_SIZEOF unary_expression { 675 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 676 if ($$ != NULL) 677 check_expr_misc($2, 678 false, false, false, false, false, true); 679 } 680 | T_SIZEOF T_LPAREN type_name T_RPAREN { 681 $$ = build_sizeof($3); 682 } 683 | T_ALIGNOF unary_expression { 684 /* non type argument to alignof is a GCC extension */ 685 gnuism(349); 686 lint_assert($2 != NULL); 687 $$ = build_alignof($2->tn_type); 688 } 689 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 690 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 691 /* TODO: c11ism */ 692 $$ = build_alignof($3); 693 } 694 ; 695 696 /* The rule 'unary_operator' is inlined into unary_expression. */ 697 698 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 699 cast_expression: 700 unary_expression 701 | T_LPAREN type_name T_RPAREN cast_expression { 702 $$ = cast($4, $2); 703 } 704 ; 705 706 expression_opt: 707 /* empty */ { 708 $$ = NULL; 709 } 710 | expression 711 ; 712 713 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 714 /* 'conditional_expression' also implements 'additive_expression'. */ 715 /* 'conditional_expression' also implements 'shift_expression'. */ 716 /* 'conditional_expression' also implements 'relational_expression'. */ 717 /* 'conditional_expression' also implements 'equality_expression'. */ 718 /* 'conditional_expression' also implements 'AND_expression'. */ 719 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 720 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 721 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 722 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 723 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 724 conditional_expression: 725 cast_expression 726 | conditional_expression T_ASTERISK sys conditional_expression { 727 $$ = build_binary($1, MULT, $3, $4); 728 } 729 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 730 $$ = build_binary($1, $2, $3, $4); 731 } 732 | conditional_expression T_ADDITIVE sys conditional_expression { 733 $$ = build_binary($1, $2, $3, $4); 734 } 735 | conditional_expression T_SHIFT sys conditional_expression { 736 $$ = build_binary($1, $2, $3, $4); 737 } 738 | conditional_expression T_RELATIONAL sys conditional_expression { 739 $$ = build_binary($1, $2, $3, $4); 740 } 741 | conditional_expression T_EQUALITY sys conditional_expression { 742 $$ = build_binary($1, $2, $3, $4); 743 } 744 | conditional_expression T_AMPER sys conditional_expression { 745 $$ = build_binary($1, BITAND, $3, $4); 746 } 747 | conditional_expression T_BITXOR sys conditional_expression { 748 $$ = build_binary($1, BITXOR, $3, $4); 749 } 750 | conditional_expression T_BITOR sys conditional_expression { 751 $$ = build_binary($1, BITOR, $3, $4); 752 } 753 | conditional_expression T_LOGAND sys conditional_expression { 754 $$ = build_binary($1, LOGAND, $3, $4); 755 } 756 | conditional_expression T_LOGOR sys conditional_expression { 757 $$ = build_binary($1, LOGOR, $3, $4); 758 } 759 | conditional_expression T_QUEST sys 760 expression T_COLON sys conditional_expression { 761 $$ = build_binary($1, QUEST, $3, 762 build_binary($4, COLON, $6, $7)); 763 } 764 ; 765 766 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 767 assignment_expression: 768 conditional_expression 769 | unary_expression T_ASSIGN sys assignment_expression { 770 $$ = build_binary($1, ASSIGN, $3, $4); 771 } 772 | unary_expression T_OPASSIGN sys assignment_expression { 773 $$ = build_binary($1, $2, $3, $4); 774 } 775 ; 776 777 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 778 expression: 779 assignment_expression 780 | expression T_COMMA sys assignment_expression { 781 $$ = build_binary($1, COMMA, $3, $4); 782 } 783 ; 784 785 constant_expr: /* C99 6.6 */ 786 conditional_expression 787 ; 788 789 declaration_or_error: 790 declaration 791 | error T_SEMI 792 ; 793 794 declaration: /* C99 6.7 */ 795 begin_type_declmods end_type T_SEMI { 796 if (dcs->d_scl == TYPEDEF) { 797 /* typedef declares no type name */ 798 warning(72); 799 } else { 800 /* empty declaration */ 801 warning(2); 802 } 803 } 804 | begin_type_declmods end_type notype_init_declarators T_SEMI { 805 if (dcs->d_scl == TYPEDEF) { 806 /* syntax error '%s' */ 807 error(249, "missing base type for typedef"); 808 } else { 809 /* old-style declaration; add 'int' */ 810 error(1); 811 } 812 } 813 | begin_type_declaration_specifiers end_type T_SEMI { 814 if (dcs->d_scl == TYPEDEF) { 815 /* typedef declares no type name */ 816 warning(72); 817 } else if (!dcs->d_nonempty_decl) { 818 /* empty declaration */ 819 warning(2); 820 } 821 } 822 | begin_type_declaration_specifiers end_type 823 type_init_declarators T_SEMI 824 | static_assert_declaration 825 ; 826 827 begin_type_declaration_specifiers: /* see C99 6.7 */ 828 begin_type_typespec { 829 dcs_add_type($1); 830 } 831 | begin_type_declmods type_specifier { 832 dcs_add_type($2); 833 } 834 | type_attribute begin_type_declaration_specifiers 835 | begin_type_declaration_specifiers declmod 836 | begin_type_declaration_specifiers notype_type_specifier { 837 dcs_add_type($2); 838 } 839 ; 840 841 begin_type_declmods: /* see C99 6.7 */ 842 begin_type type_qualifier { 843 dcs_add_qualifier($2); 844 } 845 | begin_type T_SCLASS { 846 dcs_add_storage_class($2); 847 } 848 | begin_type_declmods declmod 849 ; 850 851 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 852 begin_type_specifier_qualifier_list_postfix 853 | type_attribute_list begin_type_specifier_qualifier_list_postfix 854 ; 855 856 begin_type_specifier_qualifier_list_postfix: 857 begin_type_typespec { 858 dcs_add_type($1); 859 } 860 | begin_type_qualifier_list type_specifier { 861 dcs_add_type($2); 862 } 863 | begin_type_specifier_qualifier_list_postfix type_qualifier { 864 dcs_add_qualifier($2); 865 } 866 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 867 dcs_add_type($2); 868 } 869 | begin_type_specifier_qualifier_list_postfix type_attribute 870 ; 871 872 begin_type_typespec: 873 begin_type notype_type_specifier { 874 $$ = $2; 875 } 876 | begin_type T_TYPENAME { 877 $$ = getsym($2)->s_type; 878 } 879 ; 880 881 begin_type_qualifier_list: 882 begin_type type_qualifier { 883 dcs_add_qualifier($2); 884 } 885 | begin_type_qualifier_list type_qualifier { 886 dcs_add_qualifier($2); 887 } 888 ; 889 890 declmod: 891 type_qualifier { 892 dcs_add_qualifier($1); 893 } 894 | T_SCLASS { 895 dcs_add_storage_class($1); 896 } 897 | type_attribute_list 898 ; 899 900 type_attribute_list_opt: 901 /* empty */ 902 | type_attribute_list 903 ; 904 905 type_attribute_list: 906 type_attribute 907 | type_attribute_list type_attribute 908 ; 909 910 type_attribute_opt: 911 /* empty */ 912 | type_attribute 913 ; 914 915 type_attribute: /* See C11 6.7 declaration-specifiers */ 916 gcc_attribute_specifier 917 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 918 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 919 | T_PACKED { 920 dcs_add_packed(); 921 } 922 | T_NORETURN 923 ; 924 925 begin_type: 926 /* empty */ { 927 dcs_begin_type(); 928 } 929 ; 930 931 end_type: 932 /* empty */ { 933 dcs_end_type(); 934 } 935 ; 936 937 type_specifier: /* C99 6.7.2 */ 938 notype_type_specifier 939 | T_TYPENAME { 940 $$ = getsym($1)->s_type; 941 } 942 ; 943 944 notype_type_specifier: /* see C99 6.7.2 */ 945 T_TYPE { 946 $$ = gettyp($1); 947 } 948 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 949 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 950 $$->t_typeof = true; 951 } 952 | atomic_type_specifier 953 | struct_or_union_specifier { 954 end_declaration_level(); 955 $$ = $1; 956 } 957 | enum_specifier { 958 end_declaration_level(); 959 $$ = $1; 960 } 961 ; 962 963 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 964 atomic_type_specifier: 965 atomic T_LPAREN type_name T_RPAREN { 966 $$ = $3; 967 } 968 ; 969 970 struct_or_union_specifier: /* C99 6.7.2.1 */ 971 struct_or_union identifier_sym { 972 /* 973 * STDC requires that "struct a;" always introduces 974 * a new tag if "a" is not declared at current level 975 * 976 * yychar is valid because otherwise the parser would not 977 * have been able to decide if it must shift or reduce 978 */ 979 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 980 } 981 | struct_or_union identifier_sym { 982 dcs->d_tag_type = make_tag_type($2, $1, true, false); 983 } braced_struct_declaration_list { 984 $$ = complete_struct_or_union($4); 985 } 986 | struct_or_union { 987 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 988 } braced_struct_declaration_list { 989 $$ = complete_struct_or_union($3); 990 } 991 | struct_or_union error { 992 set_symtyp(FVFT); 993 $$ = gettyp(INT); 994 } 995 ; 996 997 struct_or_union: /* C99 6.7.2.1 */ 998 T_STRUCT_OR_UNION { 999 set_symtyp(FTAG); 1000 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1001 dcs->d_sou_size_in_bits = 0; 1002 dcs->d_sou_align_in_bits = CHAR_SIZE; 1003 $$ = $1; 1004 } 1005 | struct_or_union type_attribute 1006 ; 1007 1008 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 1009 struct_declaration_lbrace struct_declaration_list_with_rbrace { 1010 $$ = $2; 1011 } 1012 ; 1013 1014 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 1015 T_LBRACE { 1016 set_symtyp(FVFT); 1017 } 1018 ; 1019 1020 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1021 struct_declaration_list T_RBRACE 1022 | T_RBRACE { 1023 /* XXX: This is not allowed by any C standard. */ 1024 $$ = NULL; 1025 } 1026 ; 1027 1028 struct_declaration_list: /* C99 6.7.2.1 */ 1029 struct_declaration 1030 | struct_declaration_list struct_declaration { 1031 $$ = concat_symbols($1, $2); 1032 } 1033 ; 1034 1035 struct_declaration: /* C99 6.7.2.1 */ 1036 begin_type_qualifier_list end_type { 1037 /* ^^ There is no check for the missing type-specifier. */ 1038 /* too late, i know, but getsym() compensates it */ 1039 set_symtyp(FMEMBER); 1040 } notype_struct_declarators type_attribute_opt T_SEMI { 1041 set_symtyp(FVFT); 1042 $$ = $4; 1043 } 1044 | begin_type_specifier_qualifier_list end_type { 1045 set_symtyp(FMEMBER); 1046 } type_struct_declarators type_attribute_opt T_SEMI { 1047 set_symtyp(FVFT); 1048 $$ = $4; 1049 } 1050 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1051 /* syntax error '%s' */ 1052 error(249, "member without type"); 1053 $$ = NULL; 1054 } 1055 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1056 T_SEMI { 1057 set_symtyp(FVFT); 1058 if (!allow_c11 && !allow_gcc) 1059 /* anonymous struct/union members is a C11 feature */ 1060 warning(49); 1061 if (is_struct_or_union(dcs->d_type->t_tspec)) 1062 $$ = declare_unnamed_member(); 1063 else { 1064 /* syntax error '%s' */ 1065 error(249, "unnamed member"); 1066 $$ = NULL; 1067 } 1068 } 1069 | static_assert_declaration { 1070 $$ = NULL; 1071 } 1072 | error T_SEMI { 1073 set_symtyp(FVFT); 1074 $$ = NULL; 1075 } 1076 ; 1077 1078 notype_struct_declarators: 1079 notype_struct_declarator { 1080 $$ = declare_member($1); 1081 } 1082 | notype_struct_declarators { 1083 set_symtyp(FMEMBER); 1084 } T_COMMA type_struct_declarator { 1085 $$ = concat_symbols($1, declare_member($4)); 1086 } 1087 ; 1088 1089 type_struct_declarators: 1090 type_struct_declarator { 1091 $$ = declare_member($1); 1092 } 1093 | type_struct_declarators { 1094 set_symtyp(FMEMBER); 1095 } T_COMMA type_struct_declarator { 1096 $$ = concat_symbols($1, declare_member($4)); 1097 } 1098 ; 1099 1100 notype_struct_declarator: 1101 notype_declarator 1102 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1103 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1104 } 1105 | { 1106 set_symtyp(FVFT); 1107 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1108 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1109 } 1110 ; 1111 1112 type_struct_declarator: 1113 type_declarator 1114 | type_declarator T_COLON constant_expr { 1115 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1116 } 1117 | { 1118 set_symtyp(FVFT); 1119 } T_COLON constant_expr { 1120 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1121 } 1122 ; 1123 1124 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1125 enum_specifier: /* C99 6.7.2.2 */ 1126 enum gcc_attribute_specifier_list_opt identifier_sym { 1127 $$ = make_tag_type($3, ENUM, false, false); 1128 } 1129 | enum gcc_attribute_specifier_list_opt identifier_sym { 1130 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1131 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1132 $$ = complete_enum($5); 1133 } 1134 | enum gcc_attribute_specifier_list_opt { 1135 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1136 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1137 $$ = complete_enum($4); 1138 } 1139 | enum error { 1140 set_symtyp(FVFT); 1141 $$ = gettyp(INT); 1142 } 1143 ; 1144 1145 enum: /* helper for C99 6.7.2.2 */ 1146 T_ENUM { 1147 set_symtyp(FTAG); 1148 begin_declaration_level(DLK_ENUM); 1149 } 1150 ; 1151 1152 enum_declaration: /* helper for C99 6.7.2.2 */ 1153 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1154 $$ = $2; 1155 } 1156 ; 1157 1158 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1159 T_LBRACE { 1160 set_symtyp(FVFT); 1161 enumval = 0; 1162 } 1163 ; 1164 1165 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1166 enumerator_list 1167 | enumerator_list T_COMMA { 1168 if (!allow_c99 && !allow_trad) { 1169 /* trailing ',' prohibited in enum declaration */ 1170 error(54); 1171 } else { 1172 /* trailing ',' prohibited in enum declaration */ 1173 c99ism(54); 1174 } 1175 $$ = $1; 1176 } 1177 ; 1178 1179 enumerator_list: /* C99 6.7.2.2 */ 1180 enumerator 1181 | enumerator_list T_COMMA enumerator { 1182 $$ = concat_symbols($1, $3); 1183 } 1184 | error { 1185 $$ = NULL; 1186 } 1187 ; 1188 1189 enumerator: /* C99 6.7.2.2 */ 1190 identifier_sym gcc_attribute_specifier_list_opt { 1191 $$ = enumeration_constant($1, enumval, true); 1192 } 1193 | identifier_sym gcc_attribute_specifier_list_opt 1194 T_ASSIGN constant_expr { 1195 $$ = enumeration_constant($1, to_int_constant($4, true), 1196 false); 1197 } 1198 ; 1199 1200 type_qualifier: /* C99 6.7.3 */ 1201 T_QUAL 1202 | atomic { 1203 $$ = ATOMIC; 1204 } 1205 ; 1206 1207 atomic: /* helper */ 1208 T_ATOMIC { 1209 /* TODO: First fix c11ism, then use it here. */ 1210 if (!allow_c11) 1211 /* '_Atomic' requires C11 or later */ 1212 error(350); 1213 } 1214 ; 1215 1216 pointer: /* C99 6.7.5 */ 1217 asterisk type_qualifier_list_opt { 1218 $$ = merge_qualified_pointer($1, $2); 1219 } 1220 | asterisk type_qualifier_list_opt pointer { 1221 $$ = merge_qualified_pointer($1, $2); 1222 $$ = merge_qualified_pointer($$, $3); 1223 } 1224 ; 1225 1226 asterisk: /* helper for 'pointer' */ 1227 T_ASTERISK { 1228 $$ = xcalloc(1, sizeof(*$$)); 1229 $$->p_pointer = true; 1230 } 1231 ; 1232 1233 type_qualifier_list_opt: /* see C99 6.7.5 */ 1234 /* empty */ { 1235 $$ = NULL; 1236 } 1237 | type_qualifier_list 1238 ; 1239 1240 type_qualifier_list: /* C99 6.7.5 */ 1241 type_qualifier_list_elem 1242 | type_qualifier_list type_qualifier_list_elem { 1243 $$ = merge_qualified_pointer($1, $2); 1244 } 1245 ; 1246 1247 type_qualifier_list_elem: /* helper for 'pointer' */ 1248 type_qualifier { 1249 $$ = xcalloc(1, sizeof(*$$)); 1250 if ($1 == CONST) 1251 $$->p_const = true; 1252 if ($1 == VOLATILE) 1253 $$->p_volatile = true; 1254 } 1255 ; 1256 1257 /* 1258 * For an explanation of 'notype' in the following rules, see 1259 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1260 */ 1261 1262 notype_init_declarators: 1263 notype_init_declarator 1264 | notype_init_declarators T_COMMA type_init_declarator 1265 ; 1266 1267 type_init_declarators: 1268 type_init_declarator 1269 | type_init_declarators T_COMMA type_init_declarator 1270 ; 1271 1272 notype_init_declarator: 1273 notype_declarator asm_or_symbolrename_opt { 1274 cgram_declare($1, false, $2); 1275 check_size($1); 1276 } 1277 | notype_declarator asm_or_symbolrename_opt { 1278 begin_initialization($1); 1279 cgram_declare($1, true, $2); 1280 } T_ASSIGN initializer { 1281 check_size($1); 1282 end_initialization(); 1283 } 1284 ; 1285 1286 type_init_declarator: 1287 type_declarator asm_or_symbolrename_opt { 1288 cgram_declare($1, false, $2); 1289 check_size($1); 1290 } 1291 | type_declarator asm_or_symbolrename_opt { 1292 begin_initialization($1); 1293 cgram_declare($1, true, $2); 1294 } T_ASSIGN initializer { 1295 check_size($1); 1296 end_initialization(); 1297 } 1298 ; 1299 1300 notype_declarator: 1301 notype_direct_declarator 1302 | pointer notype_direct_declarator { 1303 $$ = add_pointer($2, $1); 1304 } 1305 ; 1306 1307 type_declarator: 1308 type_direct_declarator 1309 | pointer type_direct_declarator { 1310 $$ = add_pointer($2, $1); 1311 } 1312 ; 1313 1314 notype_direct_declarator: 1315 type_attribute_list_opt T_NAME { 1316 $$ = declarator_name(getsym($2)); 1317 } 1318 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1319 $$ = $3; 1320 } 1321 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1322 $$ = add_array($1, $3.has_dim, $3.dim); 1323 } 1324 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1325 $$ = add_function(symbolrename($1, $3), $2); 1326 end_declaration_level(); 1327 block_level--; 1328 } 1329 | notype_direct_declarator type_attribute 1330 ; 1331 1332 type_direct_declarator: 1333 type_attribute_list_opt identifier { 1334 $$ = declarator_name(getsym($2)); 1335 } 1336 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1337 $$ = $3; 1338 } 1339 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1340 $$ = add_array($1, $3.has_dim, $3.dim); 1341 } 1342 | type_direct_declarator param_list asm_or_symbolrename_opt { 1343 $$ = add_function(symbolrename($1, $3), $2); 1344 end_declaration_level(); 1345 block_level--; 1346 } 1347 | type_direct_declarator type_attribute 1348 ; 1349 1350 /* 1351 * The two distinct rules type_param_declarator and notype_param_declarator 1352 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1353 * always treated as a typename, not an argument name. For example, after 1354 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1355 * "f(int (double));", not "f(int a);". 1356 */ 1357 type_param_declarator: 1358 direct_param_declarator 1359 | pointer direct_param_declarator { 1360 $$ = add_pointer($2, $1); 1361 } 1362 ; 1363 1364 notype_param_declarator: 1365 direct_notype_param_declarator 1366 | pointer direct_notype_param_declarator { 1367 $$ = add_pointer($2, $1); 1368 } 1369 ; 1370 1371 direct_param_declarator: 1372 identifier type_attribute_list { 1373 $$ = declarator_name(getsym($1)); 1374 } 1375 | identifier { 1376 $$ = declarator_name(getsym($1)); 1377 } 1378 | T_LPAREN notype_param_declarator T_RPAREN { 1379 $$ = $2; 1380 } 1381 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1382 gcc_attribute_specifier_list_opt { 1383 $$ = add_array($1, $3.has_dim, $3.dim); 1384 } 1385 | direct_param_declarator param_list asm_or_symbolrename_opt { 1386 $$ = add_function(symbolrename($1, $3), $2); 1387 end_declaration_level(); 1388 block_level--; 1389 } 1390 ; 1391 1392 direct_notype_param_declarator: 1393 identifier { 1394 $$ = declarator_name(getsym($1)); 1395 } 1396 | T_LPAREN notype_param_declarator T_RPAREN { 1397 $$ = $2; 1398 } 1399 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1400 $$ = add_array($1, $3.has_dim, $3.dim); 1401 } 1402 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1403 $$ = add_function(symbolrename($1, $3), $2); 1404 end_declaration_level(); 1405 block_level--; 1406 } 1407 ; 1408 1409 param_list: 1410 id_list_lparen identifier_list T_RPAREN { 1411 $$ = $2; 1412 } 1413 | abstract_decl_param_list 1414 ; 1415 1416 id_list_lparen: 1417 T_LPAREN { 1418 block_level++; 1419 begin_declaration_level(DLK_PROTO_PARAMS); 1420 } 1421 ; 1422 1423 array_size_opt: 1424 /* empty */ { 1425 $$.has_dim = false; 1426 $$.dim = 0; 1427 } 1428 | T_ASTERISK { 1429 /* since C99; variable length array of unspecified size */ 1430 $$.has_dim = false; /* TODO: maybe change to true */ 1431 $$.dim = 0; /* just as a placeholder */ 1432 } 1433 | array_size { 1434 $$.has_dim = true; 1435 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1436 } 1437 ; 1438 1439 array_size: 1440 type_qualifier_list_opt T_SCLASS constant_expr { 1441 /* C11 6.7.6.3p7 */ 1442 if ($2 != STATIC) 1443 yyerror("Bad attribute"); 1444 /* static array size is a C11 extension */ 1445 c11ism(343); 1446 $$ = $3; 1447 } 1448 | type_qualifier { 1449 /* C11 6.7.6.2 */ 1450 if ($1 != RESTRICT) 1451 yyerror("Bad attribute"); 1452 $$ = NULL; 1453 } 1454 | constant_expr 1455 ; 1456 1457 identifier_list: /* C99 6.7.5 */ 1458 T_NAME { 1459 $$ = old_style_function_parameter_name(getsym($1)); 1460 } 1461 | identifier_list T_COMMA T_NAME { 1462 $$ = concat_symbols($1, 1463 old_style_function_parameter_name(getsym($3))); 1464 } 1465 | identifier_list error 1466 ; 1467 1468 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1469 type_name: /* C99 6.7.6 */ 1470 { 1471 begin_declaration_level(DLK_ABSTRACT); 1472 } abstract_declaration { 1473 end_declaration_level(); 1474 $$ = $2->s_type; 1475 } 1476 ; 1477 1478 abstract_declaration: /* specific to lint */ 1479 begin_type_qualifier_list end_type { 1480 $$ = declare_abstract_type(abstract_name()); 1481 } 1482 | begin_type_specifier_qualifier_list end_type { 1483 $$ = declare_abstract_type(abstract_name()); 1484 } 1485 | begin_type_qualifier_list end_type abstract_declarator { 1486 $$ = declare_abstract_type($3); 1487 } 1488 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1489 $$ = declare_abstract_type($3); 1490 } 1491 ; 1492 1493 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1494 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1495 abstract_declarator: 1496 pointer { 1497 $$ = add_pointer(abstract_name(), $1); 1498 } 1499 | direct_abstract_declarator 1500 | pointer direct_abstract_declarator { 1501 $$ = add_pointer($2, $1); 1502 } 1503 | type_attribute_list direct_abstract_declarator { 1504 $$ = $2; 1505 } 1506 | pointer type_attribute_list direct_abstract_declarator { 1507 $$ = add_pointer($3, $1); 1508 } 1509 ; 1510 1511 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1512 direct_abstract_declarator: 1513 /* TODO: sort rules according to C99 */ 1514 T_LPAREN abstract_declarator T_RPAREN { 1515 $$ = $2; 1516 } 1517 | T_LBRACK array_size_opt T_RBRACK { 1518 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1519 } 1520 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1521 $$ = add_array($1, $3.has_dim, $3.dim); 1522 } 1523 | abstract_decl_param_list asm_or_symbolrename_opt { 1524 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1525 end_declaration_level(); 1526 block_level--; 1527 } 1528 | direct_abstract_declarator abstract_decl_param_list 1529 asm_or_symbolrename_opt { 1530 $$ = add_function(symbolrename($1, $3), $2); 1531 end_declaration_level(); 1532 block_level--; 1533 } 1534 | direct_abstract_declarator type_attribute_list 1535 ; 1536 1537 abstract_decl_param_list: /* specific to lint */ 1538 abstract_decl_lparen T_RPAREN type_attribute_opt { 1539 $$ = NULL; 1540 } 1541 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1542 type_attribute_opt { 1543 dcs->d_prototype = true; 1544 $$ = $2; 1545 } 1546 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1547 $$ = NULL; 1548 } 1549 ; 1550 1551 abstract_decl_lparen: /* specific to lint */ 1552 T_LPAREN { 1553 block_level++; 1554 begin_declaration_level(DLK_PROTO_PARAMS); 1555 } 1556 ; 1557 1558 vararg_parameter_type_list: /* specific to lint */ 1559 parameter_type_list 1560 | parameter_type_list T_COMMA T_ELLIPSIS { 1561 dcs->d_vararg = true; 1562 $$ = $1; 1563 } 1564 | T_ELLIPSIS { 1565 /* TODO: C99 6.7.5 makes this an error as well. */ 1566 if (!allow_trad && !allow_c99) { 1567 /* ANSI C requires formal parameter before '...' */ 1568 error(84); 1569 } else if (allow_c90) { 1570 /* ANSI C requires formal parameter before '...' */ 1571 warning(84); 1572 } 1573 dcs->d_vararg = true; 1574 $$ = NULL; 1575 } 1576 ; 1577 1578 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1579 parameter_type_list: 1580 parameter_declaration 1581 | parameter_type_list T_COMMA parameter_declaration { 1582 $$ = concat_symbols($1, $3); 1583 } 1584 ; 1585 1586 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1587 parameter_declaration: 1588 begin_type_declmods end_type { 1589 /* ^^ There is no check for the missing type-specifier. */ 1590 $$ = declare_argument(abstract_name(), false); 1591 } 1592 | begin_type_declaration_specifiers end_type { 1593 $$ = declare_argument(abstract_name(), false); 1594 } 1595 | begin_type_declmods end_type notype_param_declarator { 1596 /* ^^ There is no check for the missing type-specifier. */ 1597 $$ = declare_argument($3, false); 1598 } 1599 /* 1600 * type_param_declarator is needed because of following conflict: 1601 * "typedef int a; f(int (a));" could be parsed as 1602 * "function with argument a of type int", or 1603 * "function with an abstract argument of type function". 1604 * This grammar realizes the second case. 1605 */ 1606 | begin_type_declaration_specifiers end_type type_param_declarator { 1607 $$ = declare_argument($3, false); 1608 } 1609 | begin_type_declmods end_type abstract_declarator { 1610 /* ^^ There is no check for the missing type-specifier. */ 1611 $$ = declare_argument($3, false); 1612 } 1613 | begin_type_declaration_specifiers end_type abstract_declarator { 1614 $$ = declare_argument($3, false); 1615 } 1616 ; 1617 1618 braced_initializer: 1619 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1620 init_lbrace init_rbrace { 1621 /* empty initializer braces require C23 or later */ 1622 c23ism(353); 1623 } 1624 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1625 | init_lbrace initializer_list comma_opt init_rbrace 1626 ; 1627 1628 initializer: /* C99 6.7.8 "Initialization" */ 1629 assignment_expression { 1630 init_expr($1); 1631 } 1632 | init_lbrace init_rbrace { 1633 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1634 } 1635 | init_lbrace initializer_list comma_opt init_rbrace 1636 /* XXX: What is this error handling for? */ 1637 | error 1638 ; 1639 1640 initializer_list: /* C99 6.7.8 "Initialization" */ 1641 initializer_list_item 1642 | initializer_list T_COMMA initializer_list_item 1643 ; 1644 1645 initializer_list_item: /* helper */ 1646 designation initializer 1647 | initializer 1648 ; 1649 1650 designation: /* C99 6.7.8 "Initialization" */ 1651 begin_designation designator_list T_ASSIGN 1652 | identifier T_COLON { 1653 /* GCC style struct or union member name in initializer */ 1654 gnuism(315); 1655 begin_designation(); 1656 add_designator_member($1); 1657 } 1658 ; 1659 1660 begin_designation: /* lint-specific helper */ 1661 /* empty */ { 1662 begin_designation(); 1663 } 1664 ; 1665 1666 designator_list: /* C99 6.7.8 "Initialization" */ 1667 designator 1668 | designator_list designator 1669 ; 1670 1671 designator: /* C99 6.7.8 "Initialization" */ 1672 T_LBRACK range T_RBRACK { 1673 if (!allow_c99) 1674 /* array initializer with designators is a C99 ... */ 1675 warning(321); 1676 add_designator_subscript($2); 1677 } 1678 | T_POINT identifier { 1679 if (!allow_c99) 1680 /* struct or union member name in initializer is ... */ 1681 warning(313); 1682 add_designator_member($2); 1683 } 1684 ; 1685 1686 static_assert_declaration: 1687 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1688 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1689 ; 1690 1691 range: 1692 constant_expr { 1693 $$.lo = to_int_constant($1, true); 1694 $$.hi = $$.lo; 1695 } 1696 | constant_expr T_ELLIPSIS constant_expr { 1697 $$.lo = to_int_constant($1, true); 1698 $$.hi = to_int_constant($3, true); 1699 /* initialization with '[a...b]' is a GCC extension */ 1700 gnuism(340); 1701 } 1702 ; 1703 1704 init_lbrace: /* helper */ 1705 T_LBRACE { 1706 init_lbrace(); 1707 } 1708 ; 1709 1710 init_rbrace: /* helper */ 1711 T_RBRACE { 1712 init_rbrace(); 1713 } 1714 ; 1715 1716 asm_or_symbolrename_opt: /* GCC extensions */ 1717 /* empty */ { 1718 $$ = NULL; 1719 } 1720 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1721 freeyyv(&$3, T_STRING); 1722 $$ = NULL; 1723 } 1724 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1725 gcc_attribute_specifier_list_opt { 1726 $$ = $3; 1727 } 1728 ; 1729 1730 statement: /* C99 6.8 */ 1731 expression_statement 1732 | non_expr_statement 1733 ; 1734 1735 non_expr_statement: /* helper for C99 6.8 */ 1736 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1737 | labeled_statement 1738 | compound_statement 1739 | selection_statement 1740 | iteration_statement 1741 | jump_statement { 1742 seen_fallthrough = false; 1743 } 1744 | asm_statement 1745 ; 1746 1747 labeled_statement: /* C99 6.8.1 */ 1748 label gcc_attribute_specifier_list_opt statement 1749 ; 1750 1751 label: 1752 T_NAME T_COLON { 1753 set_symtyp(FLABEL); 1754 named_label(getsym($1)); 1755 } 1756 | T_CASE constant_expr T_COLON { 1757 case_label($2); 1758 seen_fallthrough = true; 1759 } 1760 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1761 /* XXX: We don't fill all cases */ 1762 case_label($2); 1763 seen_fallthrough = true; 1764 } 1765 | T_DEFAULT T_COLON { 1766 default_label(); 1767 seen_fallthrough = true; 1768 } 1769 ; 1770 1771 compound_statement: /* C99 6.8.2 */ 1772 compound_statement_lbrace compound_statement_rbrace 1773 | compound_statement_lbrace block_item_list compound_statement_rbrace 1774 ; 1775 1776 compound_statement_lbrace: 1777 T_LBRACE { 1778 block_level++; 1779 mem_block_level++; 1780 begin_declaration_level(DLK_AUTO); 1781 } 1782 ; 1783 1784 compound_statement_rbrace: 1785 T_RBRACE { 1786 end_declaration_level(); 1787 level_free_all(mem_block_level); 1788 mem_block_level--; 1789 block_level--; 1790 seen_fallthrough = false; 1791 } 1792 ; 1793 1794 block_item_list: /* C99 6.8.2 */ 1795 block_item 1796 | block_item_list block_item { 1797 if ($1 && !$2) 1798 /* declarations after statements is a C99 feature */ 1799 c99ism(327); 1800 $$ = $1 || $2; 1801 } 1802 ; 1803 1804 block_item: /* C99 6.8.2 */ 1805 declaration_or_error { 1806 $$ = false; 1807 restore_warning_flags(); 1808 } 1809 | statement { 1810 $$ = true; 1811 restore_warning_flags(); 1812 } 1813 ; 1814 1815 expression_statement: /* C99 6.8.3 */ 1816 expression T_SEMI { 1817 expr($1, false, false, false, false); 1818 seen_fallthrough = false; 1819 } 1820 | T_SEMI { 1821 check_statement_reachable(); 1822 seen_fallthrough = false; 1823 } 1824 ; 1825 1826 selection_statement: /* C99 6.8.4 */ 1827 if_without_else %prec T_THEN { 1828 save_warning_flags(); 1829 stmt_if_then_stmt(); 1830 stmt_if_else_stmt(false); 1831 } 1832 | if_without_else T_ELSE { 1833 save_warning_flags(); 1834 stmt_if_then_stmt(); 1835 } statement { 1836 clear_warning_flags(); 1837 stmt_if_else_stmt(true); 1838 } 1839 | if_without_else T_ELSE error { 1840 clear_warning_flags(); 1841 stmt_if_else_stmt(false); 1842 } 1843 | switch_expr statement { 1844 clear_warning_flags(); 1845 stmt_switch_expr_stmt(); 1846 } 1847 | switch_expr error { 1848 clear_warning_flags(); 1849 stmt_switch_expr_stmt(); 1850 } 1851 ; 1852 1853 if_without_else: /* see C99 6.8.4 */ 1854 if_expr statement 1855 | if_expr error 1856 ; 1857 1858 if_expr: /* see C99 6.8.4 */ 1859 T_IF T_LPAREN expression T_RPAREN { 1860 stmt_if_expr($3); 1861 clear_warning_flags(); 1862 } 1863 ; 1864 1865 switch_expr: /* see C99 6.8.4 */ 1866 T_SWITCH T_LPAREN expression T_RPAREN { 1867 stmt_switch_expr($3); 1868 clear_warning_flags(); 1869 } 1870 ; 1871 1872 iteration_statement: /* C99 6.8.5 */ 1873 while_expr statement { 1874 clear_warning_flags(); 1875 stmt_while_expr_stmt(); 1876 } 1877 | while_expr error { 1878 clear_warning_flags(); 1879 stmt_while_expr_stmt(); 1880 } 1881 | do_statement do_while_expr { 1882 stmt_do_while_expr($2); 1883 seen_fallthrough = false; 1884 } 1885 | do error { 1886 clear_warning_flags(); 1887 stmt_do_while_expr(NULL); 1888 } 1889 | for_exprs statement { 1890 clear_warning_flags(); 1891 stmt_for_exprs_stmt(); 1892 end_declaration_level(); 1893 block_level--; 1894 } 1895 | for_exprs error { 1896 clear_warning_flags(); 1897 stmt_for_exprs_stmt(); 1898 end_declaration_level(); 1899 block_level--; 1900 } 1901 ; 1902 1903 while_expr: /* see C99 6.8.5 */ 1904 T_WHILE T_LPAREN expression T_RPAREN { 1905 stmt_while_expr($3); 1906 clear_warning_flags(); 1907 } 1908 ; 1909 1910 do_statement: /* see C99 6.8.5 */ 1911 do statement { 1912 clear_warning_flags(); 1913 } 1914 ; 1915 1916 do: /* see C99 6.8.5 */ 1917 T_DO { 1918 stmt_do(); 1919 } 1920 ; 1921 1922 do_while_expr: /* see C99 6.8.5 */ 1923 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1924 $$ = $3; 1925 } 1926 ; 1927 1928 for_start: /* see C99 6.8.5 */ 1929 T_FOR T_LPAREN { 1930 begin_declaration_level(DLK_AUTO); 1931 block_level++; 1932 } 1933 ; 1934 1935 for_exprs: /* see C99 6.8.5 */ 1936 for_start 1937 begin_type_declaration_specifiers end_type 1938 notype_init_declarators T_SEMI 1939 expression_opt T_SEMI 1940 expression_opt T_RPAREN { 1941 /* variable declaration in for loop */ 1942 c99ism(325); 1943 stmt_for_exprs(NULL, $6, $8); 1944 clear_warning_flags(); 1945 } 1946 | for_start 1947 expression_opt T_SEMI 1948 expression_opt T_SEMI 1949 expression_opt T_RPAREN { 1950 stmt_for_exprs($2, $4, $6); 1951 clear_warning_flags(); 1952 } 1953 ; 1954 1955 jump_statement: /* C99 6.8.6 */ 1956 goto identifier T_SEMI { 1957 stmt_goto(getsym($2)); 1958 } 1959 | goto error T_SEMI { 1960 set_symtyp(FVFT); 1961 } 1962 | T_CONTINUE T_SEMI { 1963 stmt_continue(); 1964 } 1965 | T_BREAK T_SEMI { 1966 stmt_break(); 1967 } 1968 | T_RETURN sys T_SEMI { 1969 stmt_return($2, NULL); 1970 } 1971 | T_RETURN sys expression T_SEMI { 1972 stmt_return($2, $3); 1973 } 1974 ; 1975 1976 goto: /* see C99 6.8.6 */ 1977 T_GOTO { 1978 set_symtyp(FLABEL); 1979 } 1980 ; 1981 1982 asm_statement: /* GCC extension */ 1983 T_ASM T_LPAREN read_until_rparen T_SEMI { 1984 dcs_set_asm(); 1985 } 1986 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 1987 dcs_set_asm(); 1988 } 1989 | T_ASM error 1990 ; 1991 1992 read_until_rparen: /* helper for 'asm_statement' */ 1993 /* empty */ { 1994 read_until_rparen(); 1995 } 1996 ; 1997 1998 translation_unit: /* C99 6.9 */ 1999 external_declaration 2000 | translation_unit external_declaration 2001 ; 2002 2003 external_declaration: /* C99 6.9 */ 2004 function_definition { 2005 global_clean_up_decl(false); 2006 clear_warning_flags(); 2007 } 2008 | top_level_declaration { 2009 global_clean_up_decl(false); 2010 clear_warning_flags(); 2011 } 2012 | asm_statement /* GCC extension */ 2013 | T_SEMI { /* GCC extension */ 2014 /* 2015 * TODO: Only allow this in GCC mode, not in plain C99. 2016 * This is one of the top 10 warnings in the NetBSD build. 2017 */ 2018 if (!allow_trad && !allow_c99) { 2019 /* empty declaration */ 2020 error(0); 2021 } else if (allow_c90) { 2022 /* empty declaration */ 2023 warning(0); 2024 } 2025 } 2026 ; 2027 2028 /* 2029 * On the top level, lint allows several forms of declarations that it doesn't 2030 * allow in functions. For example, a single ';' is an empty declaration and 2031 * is supported by some compilers, but in a function it would be an empty 2032 * statement, not a declaration. This makes a difference in C90 mode, where 2033 * a statement must not be followed by a declaration. 2034 * 2035 * See 'declaration' for all other declarations. 2036 */ 2037 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2038 begin_type end_type notype_init_declarators T_SEMI { 2039 /* TODO: Make this an error in C99 mode as well. */ 2040 if (!allow_trad && !allow_c99) { 2041 /* old-style declaration; add 'int' */ 2042 error(1); 2043 } else if (allow_c90) { 2044 /* old-style declaration; add 'int' */ 2045 warning(1); 2046 } 2047 } 2048 | declaration 2049 | error T_SEMI { 2050 global_clean_up(); 2051 } 2052 | error T_RBRACE { 2053 global_clean_up(); 2054 } 2055 ; 2056 2057 function_definition: /* C99 6.9.1 */ 2058 func_declarator { 2059 if ($1->s_type->t_tspec != FUNC) { 2060 /* syntax error '%s' */ 2061 error(249, yytext); 2062 YYERROR; 2063 } 2064 if ($1->s_type->t_typedef) { 2065 /* ()-less function definition */ 2066 error(64); 2067 YYERROR; 2068 } 2069 check_extern_declaration($1); 2070 begin_function($1); 2071 block_level++; 2072 begin_declaration_level(DLK_OLD_STYLE_ARGS); 2073 if (lwarn == LWARN_NONE) 2074 $1->s_used = true; 2075 } arg_declaration_list_opt { 2076 end_declaration_level(); 2077 block_level--; 2078 check_func_lint_directives(); 2079 check_func_old_style_arguments(); 2080 begin_control_statement(CS_FUNCTION_BODY); 2081 } compound_statement { 2082 end_function(); 2083 end_control_statement(CS_FUNCTION_BODY); 2084 } 2085 ; 2086 2087 func_declarator: 2088 begin_type end_type notype_declarator { 2089 if (!allow_trad) { 2090 /* old-style declaration; add 'int' */ 2091 error(1); 2092 } 2093 $$ = $3; 2094 } 2095 | begin_type_declmods end_type notype_declarator { 2096 if (!allow_trad) { 2097 /* old-style declaration; add 'int' */ 2098 error(1); 2099 } 2100 $$ = $3; 2101 } 2102 | begin_type_declaration_specifiers end_type type_declarator { 2103 $$ = $3; 2104 } 2105 ; 2106 2107 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2108 /* empty */ 2109 | arg_declaration_list 2110 ; 2111 2112 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2113 arg_declaration 2114 | arg_declaration_list arg_declaration 2115 /* XXX or better "arg_declaration error" ? */ 2116 | error 2117 ; 2118 2119 /* 2120 * "arg_declaration" is separated from "declaration" because it 2121 * needs other error handling. 2122 */ 2123 arg_declaration: 2124 begin_type_declmods end_type T_SEMI { 2125 /* empty declaration */ 2126 warning(2); 2127 } 2128 | begin_type_declmods end_type notype_init_declarators T_SEMI 2129 | begin_type_declaration_specifiers end_type T_SEMI { 2130 if (!dcs->d_nonempty_decl) { 2131 /* empty declaration */ 2132 warning(2); 2133 } else { 2134 /* '%s' declared in argument declaration list */ 2135 warning(3, type_name(dcs->d_type)); 2136 } 2137 } 2138 | begin_type_declaration_specifiers end_type 2139 type_init_declarators T_SEMI { 2140 if (dcs->d_nonempty_decl) { 2141 /* '%s' declared in argument declaration list */ 2142 warning(3, type_name(dcs->d_type)); 2143 } 2144 } 2145 | begin_type_declmods error 2146 | begin_type_declaration_specifiers error 2147 ; 2148 2149 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2150 gcc_attribute_specifier_list_opt: 2151 /* empty */ 2152 | gcc_attribute_specifier_list 2153 ; 2154 2155 gcc_attribute_specifier_list: 2156 gcc_attribute_specifier 2157 | gcc_attribute_specifier_list gcc_attribute_specifier 2158 ; 2159 2160 gcc_attribute_specifier: 2161 T_ATTRIBUTE T_LPAREN T_LPAREN { 2162 in_gcc_attribute = true; 2163 } gcc_attribute_list { 2164 in_gcc_attribute = false; 2165 } T_RPAREN T_RPAREN 2166 ; 2167 2168 gcc_attribute_list: 2169 gcc_attribute 2170 | gcc_attribute_list T_COMMA gcc_attribute 2171 ; 2172 2173 gcc_attribute: 2174 /* empty */ 2175 | T_NAME { 2176 const char *name = $1->sb_name; 2177 if (is_either(name, "packed", "__packed__")) 2178 dcs_add_packed(); 2179 else if (is_either(name, "used", "__used__") || 2180 is_either(name, "unused", "__unused__")) 2181 dcs_set_used(); 2182 else if (is_either(name, "fallthrough", "__fallthrough__")) 2183 fallthru(1); 2184 } 2185 | T_NAME T_LPAREN T_RPAREN 2186 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2187 | type_qualifier { 2188 if ($1 != CONST) 2189 yyerror("Bad attribute"); 2190 } 2191 ; 2192 2193 gcc_attribute_parameters: 2194 constant_expr 2195 | gcc_attribute_parameters T_COMMA constant_expr 2196 ; 2197 2198 sys: 2199 /* empty */ { 2200 $$ = in_system_header; 2201 } 2202 ; 2203 2204 %% 2205 2206 /* ARGSUSED */ 2207 int 2208 yyerror(const char *msg) 2209 { 2210 /* syntax error '%s' */ 2211 error(249, yytext); 2212 if (++sytxerr >= 5) 2213 norecover(); 2214 return 0; 2215 } 2216 2217 #if YYDEBUG && YYBYACC 2218 static const char * 2219 cgram_to_string(int token, YYSTYPE val) 2220 { 2221 2222 switch (token) { 2223 case T_INCDEC: 2224 case T_MULTIPLICATIVE: 2225 case T_ADDITIVE: 2226 case T_SHIFT: 2227 case T_RELATIONAL: 2228 case T_EQUALITY: 2229 case T_OPASSIGN: 2230 return op_name(val.y_op); 2231 case T_SCLASS: 2232 return scl_name(val.y_scl); 2233 case T_TYPE: 2234 case T_STRUCT_OR_UNION: 2235 return tspec_name(val.y_tspec); 2236 case T_QUAL: 2237 return tqual_name(val.y_tqual); 2238 case T_NAME: 2239 return val.y_name->sb_name; 2240 default: 2241 return "<none>"; 2242 } 2243 } 2244 #endif 2245 2246 static void 2247 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2248 { 2249 declare(decl, has_initializer, renaming); 2250 if (renaming != NULL) 2251 freeyyv(&renaming, T_NAME); 2252 } 2253 2254 /* 2255 * Discard all input tokens up to and including the next 2256 * unmatched right paren 2257 */ 2258 static void 2259 read_until_rparen(void) 2260 { 2261 int level; 2262 2263 if (yychar < 0) 2264 yychar = yylex(); 2265 freeyyv(&yylval, yychar); 2266 2267 level = 1; 2268 while (yychar > 0) { 2269 if (yychar == T_LPAREN) 2270 level++; 2271 if (yychar == T_RPAREN && --level == 0) 2272 break; 2273 freeyyv(&yylval, yychar = yylex()); 2274 } 2275 2276 yyclearin; 2277 } 2278 2279 static sym_t * 2280 symbolrename(sym_t *s, sbuf_t *sb) 2281 { 2282 if (sb != NULL) 2283 s->s_rename = sb->sb_name; 2284 return s; 2285 } 2286
Indexes created Thu Oct 02 14:10:14 GMT 2025