cgram.y revision 1.461
1 %{ 2 /* $NetBSD: cgram.y,v 1.461 2023/07/13 23:11:11 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 1.461 2023/07/13 23:11:11 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 104 136 137 %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 type_qualifiers y_type_qualifiers; 145 function_specifier y_function_specifier; 146 type_t *y_type; 147 tnode_t *y_tnode; 148 range_t y_range; 149 strg_t *y_string; 150 qual_ptr *y_qual_ptr; 151 bool y_seen_statement; 152 struct generic_association *y_generic; 153 struct array_size y_array_size; 154 bool y_in_system_header; 155 }; 156 157 /* for Bison: 158 %printer { 159 if (is_integer($$->v_tspec)) 160 fprintf(yyo, "%lld", (unsigned long long)$$->u.integer); 161 else 162 fprintf(yyo, "%Lg", $$->u.floating); 163 } <y_val> 164 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 165 %printer { debug_sym("", $$, ""); } <y_sym> 166 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 167 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 168 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 169 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 170 %printer { 171 fprintf(yyo, "%s", function_specifier_name($$)); 172 } <y_function_specifier> 173 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 174 %printer { 175 if ($$ == NULL) 176 fprintf(yyo, "<null>"); 177 else 178 fprintf(yyo, "%s '%s'", 179 op_name($$->tn_op), type_name($$->tn_type)); 180 } <y_tnode> 181 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 182 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 183 %printer { 184 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 185 } <y_qual_ptr> 186 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 187 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 188 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 189 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 190 */ 191 192 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 193 %token T_POINT T_ARROW 194 %token T_COMPLEMENT T_LOGNOT 195 %token <y_op> T_INCDEC 196 %token T_SIZEOF 197 %token T_BUILTIN_OFFSETOF 198 %token T_TYPEOF 199 %token T_EXTENSION 200 %token T_ALIGNAS 201 %token T_ALIGNOF 202 %token T_ASTERISK 203 %token <y_op> T_MULTIPLICATIVE 204 %token <y_op> T_ADDITIVE 205 %token <y_op> T_SHIFT 206 %token <y_op> T_RELATIONAL 207 %token <y_op> T_EQUALITY 208 %token T_AMPER 209 %token T_BITXOR 210 %token T_BITOR 211 %token T_LOGAND 212 %token T_LOGOR 213 %token T_QUEST 214 %token T_COLON 215 %token T_ASSIGN 216 %token <y_op> T_OPASSIGN 217 %token T_COMMA 218 %token T_SEMI 219 %token T_ELLIPSIS 220 %token T_REAL 221 %token T_IMAG 222 %token T_GENERIC 223 224 /* storage classes (extern, static, auto, register and typedef) */ 225 %token <y_scl> T_SCLASS 226 %token <y_function_specifier> T_FUNCTION_SPECIFIER 227 228 /* 229 * predefined type keywords (char, int, short, long, unsigned, signed, 230 * float, double, void); see T_TYPENAME for types from typedef 231 */ 232 %token <y_tspec> T_TYPE 233 234 %token <y_type_qualifiers> T_QUAL 235 %token <y_type_qualifiers> 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_expression 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_member_declaration_list 322 /* No type for member_declaration_lbrace. */ 323 %type <y_sym> member_declaration_list_with_rbrace 324 %type <y_sym> member_declaration_list 325 %type <y_sym> member_declaration 326 %type <y_sym> notype_member_declarators 327 %type <y_sym> type_member_declarators 328 %type <y_sym> notype_member_declarator 329 %type <y_sym> type_member_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_type_qualifiers> type_qualifier 338 /* No type for atomic. */ 339 %type <y_qual_ptr> pointer 340 %type <y_type_qualifiers> type_qualifier_list_opt 341 %type <y_type_qualifiers> type_qualifier_list 342 /* No type for notype_init_declarators. */ 343 /* No type for type_init_declarators. */ 344 /* No type for notype_init_declarator. */ 345 /* No type for type_init_declarator. */ 346 %type <y_sym> notype_declarator 347 %type <y_sym> type_declarator 348 %type <y_sym> notype_direct_declarator 349 %type <y_sym> type_direct_declarator 350 %type <y_sym> type_param_declarator 351 %type <y_sym> notype_param_declarator 352 %type <y_sym> direct_param_declarator 353 %type <y_sym> direct_notype_param_declarator 354 %type <y_sym> param_list 355 /* No type for id_list_lparen. */ 356 /* No type for abstract_decl_lparen. */ 357 %type <y_array_size> array_size_opt 358 %type <y_tnode> array_size 359 %type <y_sym> identifier_list 360 %type <y_type> type_name 361 %type <y_sym> abstract_declaration 362 %type <y_sym> abstract_declarator 363 %type <y_sym> direct_abstract_declarator 364 %type <y_sym> abstract_decl_param_list 365 /* No type for abstract_decl_lparen. */ 366 %type <y_sym> vararg_parameter_type_list 367 %type <y_sym> parameter_type_list 368 %type <y_sym> parameter_declaration 369 /* No type for braced_initializer. */ 370 /* No type for initializer. */ 371 /* No type for initializer_list. */ 372 /* No type for initializer_list_item. */ 373 /* No type for designation. */ 374 /* No type for begin_designation. */ 375 /* No type for designator_list. */ 376 /* No type for designator. */ 377 /* No type for static_assert_declaration. */ 378 %type <y_range> range 379 /* No type for init_lbrace. */ 380 /* No type for init_rbrace. */ 381 %type <y_name> asm_or_symbolrename_opt 382 /* No type for statement. */ 383 /* No type for non_expr_statement. */ 384 /* No type for labeled_statement. */ 385 /* No type for label. */ 386 /* No type for compound_statement. */ 387 /* No type for compound_statement_lbrace. */ 388 /* No type for compound_statement_rbrace. */ 389 %type <y_seen_statement> block_item_list 390 %type <y_seen_statement> block_item 391 /* No type for expression_statement. */ 392 /* No type for selection_statement. */ 393 /* No type for if_without_else. */ 394 /* No type for if_expr. */ 395 /* No type for switch_expr. */ 396 /* No type for iteration_statement. */ 397 /* No type for while_expr. */ 398 /* No type for do_statement. */ 399 /* No type for do. */ 400 %type <y_tnode> do_while_expr 401 /* No type for for_start. */ 402 /* No type for for_exprs. */ 403 /* No type for jump_statement. */ 404 /* No type for goto. */ 405 /* No type for asm_statement. */ 406 /* No type for read_until_rparen. */ 407 /* No type for translation_unit. */ 408 /* No type for external_declaration. */ 409 /* No type for top_level_declaration. */ 410 /* No type for function_definition. */ 411 %type <y_sym> func_declarator 412 /* No type for arg_declaration_list_opt. */ 413 /* No type for arg_declaration_list. */ 414 /* No type for arg_declaration. */ 415 /* No type for gcc_attribute_specifier_list_opt. */ 416 /* No type for gcc_attribute_specifier_list. */ 417 /* No type for gcc_attribute_specifier. */ 418 /* No type for gcc_attribute_list. */ 419 /* No type for gcc_attribute. */ 420 /* No type for gcc_attribute_parameters. */ 421 %type <y_in_system_header> sys 422 423 %% 424 425 program: 426 /* empty */ { 427 /* TODO: Make this an error in C99 mode as well. */ 428 if (!allow_trad && !allow_c99) { 429 /* empty translation unit */ 430 error(272); 431 } else if (allow_c90) { 432 /* empty translation unit */ 433 warning(272); 434 } 435 } 436 | translation_unit 437 ; 438 439 identifier_sym: /* helper for struct/union/enum */ 440 identifier { 441 $$ = getsym($1); 442 } 443 ; 444 445 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 446 identifier: 447 T_NAME { 448 debug_step("cgram: name '%s'", $1->sb_name); 449 $$ = $1; 450 } 451 | T_TYPENAME { 452 debug_step("cgram: typename '%s'", $1->sb_name); 453 $$ = $1; 454 } 455 ; 456 457 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 458 string: 459 T_STRING 460 | string T_STRING { 461 if (!allow_c90) { 462 /* concatenated strings are illegal in traditional C */ 463 warning(219); 464 } 465 $$ = cat_strings($1, $2); 466 } 467 ; 468 469 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 470 primary_expression: 471 T_NAME { 472 bool sys_name, sys_next; 473 sys_name = in_system_header; 474 if (yychar < 0) 475 yychar = yylex(); 476 sys_next = in_system_header; 477 in_system_header = sys_name; 478 $$ = build_name(getsym($1), yychar == T_LPAREN); 479 in_system_header = sys_next; 480 } 481 | T_CON { 482 $$ = build_constant(gettyp($1->v_tspec), $1); 483 } 484 | string { 485 $$ = build_string($1); 486 } 487 | T_LPAREN expression T_RPAREN { 488 if ($2 != NULL) 489 $2->tn_parenthesized = true; 490 $$ = $2; 491 } 492 | generic_selection 493 /* GCC primary-expression, see c_parser_postfix_expression */ 494 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 495 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 496 set_symtyp(FMEMBER); 497 $$ = build_offsetof($3, getsym($5)); 498 } 499 ; 500 501 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 502 generic_selection: 503 T_GENERIC T_LPAREN assignment_expression T_COMMA 504 generic_assoc_list T_RPAREN { 505 /* generic selection requires C11 or later */ 506 c11ism(345); 507 $$ = build_generic_selection($3, $5); 508 } 509 ; 510 511 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 512 generic_assoc_list: 513 generic_association 514 | generic_assoc_list T_COMMA generic_association { 515 $3->ga_prev = $1; 516 $$ = $3; 517 } 518 ; 519 520 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 521 generic_association: 522 type_name T_COLON assignment_expression { 523 $$ = block_zero_alloc(sizeof(*$$)); 524 $$->ga_arg = $1; 525 $$->ga_result = $3; 526 } 527 | T_DEFAULT T_COLON assignment_expression { 528 $$ = block_zero_alloc(sizeof(*$$)); 529 $$->ga_arg = NULL; 530 $$->ga_result = $3; 531 } 532 ; 533 534 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 535 postfix_expression: 536 primary_expression 537 | postfix_expression T_LBRACK sys expression T_RBRACK { 538 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 539 } 540 | postfix_expression T_LPAREN sys T_RPAREN { 541 $$ = build_function_call($1, $3, NULL); 542 } 543 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 544 $$ = build_function_call($1, $3, $4); 545 } 546 | postfix_expression point_or_arrow sys T_NAME { 547 $$ = build_member_access($1, $2, $3, $4); 548 } 549 | postfix_expression T_INCDEC sys { 550 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 551 } 552 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 553 sym_t *tmp = mktempsym($2); 554 begin_initialization(tmp); 555 cgram_declare(tmp, true, NULL); 556 } braced_initializer { 557 if (!allow_c99) 558 /* compound literals are a C99/GCC extension */ 559 gnuism(319); 560 $$ = build_name(current_initsym(), false); 561 end_initialization(); 562 } 563 | T_LPAREN compound_statement_lbrace { 564 begin_statement_expr(); 565 } gcc_statement_expr_list { 566 do_statement_expr($4); 567 } compound_statement_rbrace T_RPAREN { 568 $$ = end_statement_expr(); 569 } 570 ; 571 572 comma_opt: /* helper for 'postfix_expression' */ 573 /* empty */ 574 | T_COMMA 575 ; 576 577 /* 578 * The inner part of a GCC statement-expression of the form ({ ... }). 579 * 580 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 581 */ 582 gcc_statement_expr_list: 583 gcc_statement_expr_item 584 | gcc_statement_expr_list gcc_statement_expr_item { 585 $$ = $2; 586 } 587 ; 588 589 gcc_statement_expr_item: 590 declaration_or_error { 591 clear_warning_flags(); 592 $$ = NULL; 593 } 594 | non_expr_statement { 595 $$ = expr_alloc_tnode(); 596 $$->tn_type = gettyp(VOID); 597 } 598 | T_SEMI { 599 $$ = expr_alloc_tnode(); 600 $$->tn_type = gettyp(VOID); 601 } 602 | expression T_SEMI { 603 if ($1 == NULL) { /* in case of syntax errors */ 604 $$ = expr_alloc_tnode(); 605 $$->tn_type = gettyp(VOID); 606 } else { 607 /* XXX: do that only on the last name */ 608 if ($1->tn_op == NAME) 609 $1->tn_sym->s_used = true; 610 expr($1, false, false, false, false); 611 suppress_fallthrough = false; 612 $$ = $1; 613 } 614 } 615 ; 616 617 point_or_arrow: /* helper for 'postfix_expression' */ 618 T_POINT { 619 set_symtyp(FMEMBER); 620 $$ = POINT; 621 } 622 | T_ARROW { 623 set_symtyp(FMEMBER); 624 $$ = ARROW; 625 } 626 ; 627 628 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 629 argument_expression_list: 630 assignment_expression { 631 $$ = build_function_argument(NULL, $1); 632 } 633 | argument_expression_list T_COMMA assignment_expression { 634 $$ = build_function_argument($1, $3); 635 } 636 ; 637 638 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 639 unary_expression: 640 postfix_expression 641 | T_INCDEC sys unary_expression { 642 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 643 } 644 | T_AMPER sys cast_expression { 645 $$ = build_unary(ADDR, $2, $3); 646 } 647 | T_ASTERISK sys cast_expression { 648 $$ = build_unary(INDIR, $2, $3); 649 } 650 | T_ADDITIVE sys cast_expression { 651 if (!allow_c90 && $1 == PLUS) { 652 /* unary '+' is illegal in traditional C */ 653 warning(100); 654 } 655 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 656 } 657 | T_COMPLEMENT sys cast_expression { 658 $$ = build_unary(COMPL, $2, $3); 659 } 660 | T_LOGNOT sys cast_expression { 661 $$ = build_unary(NOT, $2, $3); 662 } 663 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 664 $$ = build_unary(REAL, $2, $3); 665 } 666 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 667 $$ = build_unary(IMAG, $2, $3); 668 } 669 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 670 $$ = $2; 671 } 672 | T_SIZEOF unary_expression { 673 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 674 if ($$ != NULL) 675 check_expr_misc($2, 676 false, false, false, false, false, true); 677 } 678 | T_SIZEOF T_LPAREN type_name T_RPAREN { 679 $$ = build_sizeof($3); 680 } 681 | T_ALIGNOF unary_expression { 682 /* non type argument to alignof is a GCC extension */ 683 gnuism(349); 684 lint_assert($2 != NULL); 685 $$ = build_alignof($2->tn_type); 686 } 687 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 688 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 689 /* TODO: c11ism */ 690 $$ = build_alignof($3); 691 } 692 ; 693 694 /* The rule 'unary_operator' is inlined into unary_expression. */ 695 696 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 697 cast_expression: 698 unary_expression 699 | T_LPAREN type_name T_RPAREN cast_expression { 700 $$ = cast($4, $2); 701 } 702 ; 703 704 expression_opt: 705 /* empty */ { 706 $$ = NULL; 707 } 708 | expression 709 ; 710 711 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 712 /* 'conditional_expression' also implements 'additive_expression'. */ 713 /* 'conditional_expression' also implements 'shift_expression'. */ 714 /* 'conditional_expression' also implements 'relational_expression'. */ 715 /* 'conditional_expression' also implements 'equality_expression'. */ 716 /* 'conditional_expression' also implements 'AND_expression'. */ 717 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 718 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 719 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 720 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 721 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 722 conditional_expression: 723 cast_expression 724 | conditional_expression T_ASTERISK sys conditional_expression { 725 $$ = build_binary($1, MULT, $3, $4); 726 } 727 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 728 $$ = build_binary($1, $2, $3, $4); 729 } 730 | conditional_expression T_ADDITIVE sys conditional_expression { 731 $$ = build_binary($1, $2, $3, $4); 732 } 733 | conditional_expression T_SHIFT sys conditional_expression { 734 $$ = build_binary($1, $2, $3, $4); 735 } 736 | conditional_expression T_RELATIONAL sys conditional_expression { 737 $$ = build_binary($1, $2, $3, $4); 738 } 739 | conditional_expression T_EQUALITY sys conditional_expression { 740 $$ = build_binary($1, $2, $3, $4); 741 } 742 | conditional_expression T_AMPER sys conditional_expression { 743 $$ = build_binary($1, BITAND, $3, $4); 744 } 745 | conditional_expression T_BITXOR sys conditional_expression { 746 $$ = build_binary($1, BITXOR, $3, $4); 747 } 748 | conditional_expression T_BITOR sys conditional_expression { 749 $$ = build_binary($1, BITOR, $3, $4); 750 } 751 | conditional_expression T_LOGAND sys conditional_expression { 752 $$ = build_binary($1, LOGAND, $3, $4); 753 } 754 | conditional_expression T_LOGOR sys conditional_expression { 755 $$ = build_binary($1, LOGOR, $3, $4); 756 } 757 | conditional_expression T_QUEST sys 758 expression T_COLON sys conditional_expression { 759 $$ = build_binary($1, QUEST, $3, 760 build_binary($4, COLON, $6, $7)); 761 } 762 ; 763 764 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 765 assignment_expression: 766 conditional_expression 767 | unary_expression T_ASSIGN sys assignment_expression { 768 $$ = build_binary($1, ASSIGN, $3, $4); 769 } 770 | unary_expression T_OPASSIGN sys assignment_expression { 771 $$ = build_binary($1, $2, $3, $4); 772 } 773 ; 774 775 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 776 expression: 777 assignment_expression 778 | expression T_COMMA sys assignment_expression { 779 $$ = build_binary($1, COMMA, $3, $4); 780 } 781 ; 782 783 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 784 constant_expression: 785 conditional_expression 786 ; 787 788 declaration_or_error: 789 declaration 790 | error T_SEMI 791 ; 792 793 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 794 declaration: 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_qualifiers($2); 844 } 845 | begin_type T_SCLASS { 846 dcs_add_storage_class($2); 847 } 848 | begin_type T_FUNCTION_SPECIFIER { 849 dcs_add_function_specifier($2); 850 } 851 | begin_type_declmods declmod 852 ; 853 854 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 855 begin_type_specifier_qualifier_list_postfix 856 | type_attribute_list begin_type_specifier_qualifier_list_postfix 857 ; 858 859 begin_type_specifier_qualifier_list_postfix: 860 begin_type_typespec { 861 dcs_add_type($1); 862 } 863 | begin_type_qualifier_list type_specifier { 864 dcs_add_type($2); 865 } 866 | begin_type_specifier_qualifier_list_postfix type_qualifier { 867 dcs_add_qualifiers($2); 868 } 869 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 870 dcs_add_type($2); 871 } 872 | begin_type_specifier_qualifier_list_postfix type_attribute 873 ; 874 875 begin_type_typespec: 876 begin_type notype_type_specifier { 877 $$ = $2; 878 } 879 | begin_type T_TYPENAME { 880 $$ = getsym($2)->s_type; 881 } 882 ; 883 884 begin_type_qualifier_list: 885 begin_type type_qualifier { 886 dcs_add_qualifiers($2); 887 } 888 | begin_type_qualifier_list type_qualifier { 889 dcs_add_qualifiers($2); 890 } 891 ; 892 893 declmod: 894 type_qualifier { 895 dcs_add_qualifiers($1); 896 } 897 | T_SCLASS { 898 dcs_add_storage_class($1); 899 } 900 | T_FUNCTION_SPECIFIER { 901 dcs_add_function_specifier($1); 902 } 903 | type_attribute_list 904 ; 905 906 type_attribute_list_opt: 907 /* empty */ 908 | type_attribute_list 909 ; 910 911 type_attribute_list: 912 type_attribute 913 | type_attribute_list type_attribute 914 ; 915 916 type_attribute_opt: 917 /* empty */ 918 | type_attribute 919 ; 920 921 type_attribute: /* See C11 6.7 declaration-specifiers */ 922 gcc_attribute_specifier 923 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 924 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 925 | T_PACKED { 926 dcs_add_packed(); 927 } 928 ; 929 930 begin_type: 931 /* empty */ { 932 dcs_begin_type(); 933 } 934 ; 935 936 end_type: 937 /* empty */ { 938 dcs_end_type(); 939 } 940 ; 941 942 type_specifier: /* C99 6.7.2 */ 943 notype_type_specifier 944 | T_TYPENAME { 945 $$ = getsym($1)->s_type; 946 } 947 ; 948 949 notype_type_specifier: /* see C99 6.7.2 */ 950 T_TYPE { 951 $$ = gettyp($1); 952 } 953 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 954 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 955 $$->t_typeof = true; 956 } 957 | atomic_type_specifier 958 | struct_or_union_specifier { 959 end_declaration_level(); 960 $$ = $1; 961 } 962 | enum_specifier { 963 end_declaration_level(); 964 $$ = $1; 965 } 966 ; 967 968 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 969 atomic_type_specifier: 970 atomic T_LPAREN type_name T_RPAREN { 971 $$ = $3; 972 } 973 ; 974 975 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 976 struct_or_union_specifier: 977 struct_or_union identifier_sym { 978 /* 979 * STDC requires that "struct a;" always introduces 980 * a new tag if "a" is not declared at current level 981 * 982 * yychar is valid because otherwise the parser would not 983 * have been able to decide if it must shift or reduce 984 */ 985 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 986 } 987 | struct_or_union identifier_sym { 988 dcs->d_tag_type = make_tag_type($2, $1, true, false); 989 } braced_member_declaration_list { 990 $$ = complete_struct_or_union($4); 991 } 992 | struct_or_union { 993 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 994 } braced_member_declaration_list { 995 $$ = complete_struct_or_union($3); 996 } 997 | struct_or_union error { 998 set_symtyp(FVFT); 999 $$ = gettyp(INT); 1000 } 1001 ; 1002 1003 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1004 struct_or_union: 1005 T_STRUCT_OR_UNION { 1006 set_symtyp(FTAG); 1007 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1008 dcs->d_sou_size_in_bits = 0; 1009 dcs->d_sou_align_in_bits = CHAR_SIZE; 1010 $$ = $1; 1011 } 1012 | struct_or_union type_attribute 1013 ; 1014 1015 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1016 member_declaration_lbrace member_declaration_list_with_rbrace { 1017 $$ = $2; 1018 } 1019 ; 1020 1021 member_declaration_lbrace: /* see C99 6.7.2.1 */ 1022 T_LBRACE { 1023 set_symtyp(FVFT); 1024 } 1025 ; 1026 1027 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1028 member_declaration_list T_RBRACE 1029 | T_RBRACE { 1030 /* XXX: This is not allowed by any C standard. */ 1031 $$ = NULL; 1032 } 1033 ; 1034 1035 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1036 /* Was named struct_declaration_list until C11. */ 1037 member_declaration_list: 1038 member_declaration 1039 | member_declaration_list member_declaration { 1040 $$ = concat_symbols($1, $2); 1041 } 1042 ; 1043 1044 /* Was named struct_declaration until C11. */ 1045 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1046 member_declaration: 1047 begin_type_qualifier_list end_type { 1048 /* ^^ There is no check for the missing type-specifier. */ 1049 /* too late, i know, but getsym() compensates it */ 1050 set_symtyp(FMEMBER); 1051 } notype_member_declarators type_attribute_opt T_SEMI { 1052 set_symtyp(FVFT); 1053 $$ = $4; 1054 } 1055 | begin_type_specifier_qualifier_list end_type { 1056 set_symtyp(FMEMBER); 1057 } type_member_declarators type_attribute_opt T_SEMI { 1058 set_symtyp(FVFT); 1059 $$ = $4; 1060 } 1061 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1062 /* syntax error '%s' */ 1063 error(249, "member without type"); 1064 $$ = NULL; 1065 } 1066 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1067 T_SEMI { 1068 set_symtyp(FVFT); 1069 if (!allow_c11 && !allow_gcc) 1070 /* anonymous struct/union members is a C11 feature */ 1071 warning(49); 1072 if (is_struct_or_union(dcs->d_type->t_tspec)) 1073 $$ = declare_unnamed_member(); 1074 else { 1075 /* syntax error '%s' */ 1076 error(249, "unnamed member"); 1077 $$ = NULL; 1078 } 1079 } 1080 | static_assert_declaration { 1081 $$ = NULL; 1082 } 1083 | error T_SEMI { 1084 set_symtyp(FVFT); 1085 $$ = NULL; 1086 } 1087 ; 1088 1089 /* Was named struct_declarators until C11. */ 1090 notype_member_declarators: 1091 notype_member_declarator { 1092 $$ = declare_member($1); 1093 } 1094 | notype_member_declarators { 1095 set_symtyp(FMEMBER); 1096 } T_COMMA type_member_declarator { 1097 $$ = concat_symbols($1, declare_member($4)); 1098 } 1099 ; 1100 1101 /* Was named struct_declarators until C11. */ 1102 type_member_declarators: 1103 type_member_declarator { 1104 $$ = declare_member($1); 1105 } 1106 | type_member_declarators { 1107 set_symtyp(FMEMBER); 1108 } T_COMMA type_member_declarator { 1109 $$ = concat_symbols($1, declare_member($4)); 1110 } 1111 ; 1112 1113 /* Was named struct_declarator until C11. */ 1114 notype_member_declarator: 1115 notype_declarator 1116 /* C99 6.7.2.1 */ 1117 | notype_declarator T_COLON constant_expression { 1118 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1119 } 1120 /* C99 6.7.2.1 */ 1121 | { 1122 set_symtyp(FVFT); 1123 } T_COLON constant_expression { 1124 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1125 } 1126 ; 1127 1128 /* Was named struct_declarator until C11. */ 1129 type_member_declarator: 1130 type_declarator 1131 | type_declarator T_COLON constant_expression { 1132 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1133 } 1134 | { 1135 set_symtyp(FVFT); 1136 } T_COLON constant_expression { 1137 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1138 } 1139 ; 1140 1141 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1142 enum_specifier: 1143 enum gcc_attribute_specifier_list_opt identifier_sym { 1144 $$ = make_tag_type($3, ENUM, false, false); 1145 } 1146 | enum gcc_attribute_specifier_list_opt identifier_sym { 1147 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1148 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1149 $$ = complete_enum($5); 1150 } 1151 | enum gcc_attribute_specifier_list_opt { 1152 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1153 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1154 $$ = complete_enum($4); 1155 } 1156 | enum error { 1157 set_symtyp(FVFT); 1158 $$ = gettyp(INT); 1159 } 1160 ; 1161 1162 enum: /* helper for C99 6.7.2.2 */ 1163 T_ENUM { 1164 set_symtyp(FTAG); 1165 begin_declaration_level(DLK_ENUM); 1166 } 1167 ; 1168 1169 enum_declaration: /* helper for C99 6.7.2.2 */ 1170 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1171 $$ = $2; 1172 } 1173 ; 1174 1175 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1176 T_LBRACE { 1177 set_symtyp(FVFT); 1178 enumval = 0; 1179 } 1180 ; 1181 1182 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1183 enumerator_list 1184 | enumerator_list T_COMMA { 1185 if (!allow_c99 && !allow_trad) { 1186 /* trailing ',' in enum declaration requires C99 ... */ 1187 error(54); 1188 } else { 1189 /* trailing ',' in enum declaration requires C99 ... */ 1190 c99ism(54); 1191 } 1192 $$ = $1; 1193 } 1194 ; 1195 1196 enumerator_list: /* C99 6.7.2.2 */ 1197 enumerator 1198 | enumerator_list T_COMMA enumerator { 1199 $$ = concat_symbols($1, $3); 1200 } 1201 | error { 1202 $$ = NULL; 1203 } 1204 ; 1205 1206 enumerator: /* C99 6.7.2.2 */ 1207 identifier_sym gcc_attribute_specifier_list_opt { 1208 $$ = enumeration_constant($1, enumval, true); 1209 } 1210 | identifier_sym gcc_attribute_specifier_list_opt 1211 T_ASSIGN constant_expression { 1212 $$ = enumeration_constant($1, to_int_constant($4, true), 1213 false); 1214 } 1215 ; 1216 1217 type_qualifier: /* C99 6.7.3 */ 1218 T_QUAL 1219 | atomic { 1220 $$ = (type_qualifiers){ .tq_atomic = true }; 1221 } 1222 ; 1223 1224 atomic: /* helper */ 1225 T_ATOMIC { 1226 /* TODO: First fix c11ism, then use it here. */ 1227 if (!allow_c11) 1228 /* '_Atomic' requires C11 or later */ 1229 error(350); 1230 } 1231 ; 1232 1233 pointer: /* C99 6.7.5 */ 1234 T_ASTERISK type_qualifier_list_opt { 1235 $$ = xcalloc(1, sizeof(*$$)); 1236 add_type_qualifiers(&$$->qualifiers, $2); 1237 } 1238 | T_ASTERISK type_qualifier_list_opt pointer { 1239 $$ = xcalloc(1, sizeof(*$$)); 1240 add_type_qualifiers(&$$->qualifiers, $2); 1241 $$ = append_qualified_pointer($$, $3); 1242 } 1243 ; 1244 1245 type_qualifier_list_opt: /* see C99 6.7.5 */ 1246 /* empty */ { 1247 $$ = (type_qualifiers){ .tq_const = false }; 1248 } 1249 | type_qualifier_list 1250 ; 1251 1252 type_qualifier_list: /* C99 6.7.5 */ 1253 type_qualifier 1254 | type_qualifier_list type_qualifier { 1255 $$ = $1; 1256 add_type_qualifiers(&$$, $2); 1257 } 1258 ; 1259 1260 /* 1261 * For an explanation of 'notype' in the following rules, see 1262 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1263 */ 1264 1265 notype_init_declarators: 1266 notype_init_declarator 1267 | notype_init_declarators T_COMMA type_init_declarator 1268 ; 1269 1270 type_init_declarators: 1271 type_init_declarator 1272 | type_init_declarators T_COMMA type_init_declarator 1273 ; 1274 1275 notype_init_declarator: 1276 notype_declarator asm_or_symbolrename_opt { 1277 cgram_declare($1, false, $2); 1278 check_size($1); 1279 } 1280 | notype_declarator asm_or_symbolrename_opt { 1281 begin_initialization($1); 1282 cgram_declare($1, true, $2); 1283 } T_ASSIGN initializer { 1284 check_size($1); 1285 end_initialization(); 1286 } 1287 ; 1288 1289 type_init_declarator: 1290 type_declarator asm_or_symbolrename_opt { 1291 cgram_declare($1, false, $2); 1292 check_size($1); 1293 } 1294 | type_declarator asm_or_symbolrename_opt { 1295 begin_initialization($1); 1296 cgram_declare($1, true, $2); 1297 } T_ASSIGN initializer { 1298 check_size($1); 1299 end_initialization(); 1300 } 1301 ; 1302 1303 notype_declarator: 1304 notype_direct_declarator 1305 | pointer notype_direct_declarator { 1306 $$ = add_pointer($2, $1); 1307 } 1308 ; 1309 1310 type_declarator: 1311 type_direct_declarator 1312 | pointer type_direct_declarator { 1313 $$ = add_pointer($2, $1); 1314 } 1315 ; 1316 1317 notype_direct_declarator: 1318 type_attribute_list_opt T_NAME { 1319 $$ = declarator_name(getsym($2)); 1320 } 1321 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1322 $$ = $3; 1323 } 1324 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1325 $$ = add_array($1, $3.has_dim, $3.dim); 1326 } 1327 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1328 $$ = add_function(symbolrename($1, $3), $2); 1329 end_declaration_level(); 1330 block_level--; 1331 } 1332 | notype_direct_declarator type_attribute 1333 ; 1334 1335 type_direct_declarator: 1336 type_attribute_list_opt identifier { 1337 $$ = declarator_name(getsym($2)); 1338 } 1339 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1340 $$ = $3; 1341 } 1342 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1343 $$ = add_array($1, $3.has_dim, $3.dim); 1344 } 1345 | type_direct_declarator param_list asm_or_symbolrename_opt { 1346 $$ = add_function(symbolrename($1, $3), $2); 1347 end_declaration_level(); 1348 block_level--; 1349 } 1350 | type_direct_declarator type_attribute 1351 ; 1352 1353 /* 1354 * The two distinct rules type_param_declarator and notype_param_declarator 1355 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1356 * always treated as a typename, not an argument name. For example, after 1357 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1358 * "f(int (double));", not "f(int a);". 1359 */ 1360 type_param_declarator: 1361 direct_param_declarator 1362 | pointer direct_param_declarator { 1363 $$ = add_pointer($2, $1); 1364 } 1365 ; 1366 1367 notype_param_declarator: 1368 direct_notype_param_declarator 1369 | pointer direct_notype_param_declarator { 1370 $$ = add_pointer($2, $1); 1371 } 1372 ; 1373 1374 direct_param_declarator: 1375 identifier type_attribute_list { 1376 $$ = declarator_name(getsym($1)); 1377 } 1378 | identifier { 1379 $$ = declarator_name(getsym($1)); 1380 } 1381 | T_LPAREN notype_param_declarator T_RPAREN { 1382 $$ = $2; 1383 } 1384 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1385 gcc_attribute_specifier_list_opt { 1386 $$ = add_array($1, $3.has_dim, $3.dim); 1387 } 1388 | direct_param_declarator param_list asm_or_symbolrename_opt { 1389 $$ = add_function(symbolrename($1, $3), $2); 1390 end_declaration_level(); 1391 block_level--; 1392 } 1393 ; 1394 1395 direct_notype_param_declarator: 1396 identifier { 1397 $$ = declarator_name(getsym($1)); 1398 } 1399 | T_LPAREN notype_param_declarator T_RPAREN { 1400 $$ = $2; 1401 } 1402 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1403 $$ = add_array($1, $3.has_dim, $3.dim); 1404 } 1405 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1406 $$ = add_function(symbolrename($1, $3), $2); 1407 end_declaration_level(); 1408 block_level--; 1409 } 1410 ; 1411 1412 param_list: 1413 id_list_lparen identifier_list T_RPAREN { 1414 $$ = $2; 1415 } 1416 | abstract_decl_param_list 1417 ; 1418 1419 id_list_lparen: 1420 T_LPAREN { 1421 block_level++; 1422 begin_declaration_level(DLK_PROTO_PARAMS); 1423 } 1424 ; 1425 1426 array_size_opt: 1427 /* empty */ { 1428 $$.has_dim = false; 1429 $$.dim = 0; 1430 } 1431 | T_ASTERISK { 1432 /* since C99; variable length array of unspecified size */ 1433 $$.has_dim = false; /* TODO: maybe change to true */ 1434 $$.dim = 0; /* just as a placeholder */ 1435 } 1436 | array_size { 1437 $$.has_dim = true; 1438 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1439 } 1440 ; 1441 1442 array_size: 1443 type_qualifier_list_opt T_SCLASS constant_expression { 1444 /* C11 6.7.6.3p7 */ 1445 if ($2 != STATIC) 1446 yyerror("Bad attribute"); 1447 /* static array size is a C11 extension */ 1448 c11ism(343); 1449 $$ = $3; 1450 } 1451 | type_qualifier { 1452 /* C11 6.7.6.2 */ 1453 if (!$1.tq_restrict) 1454 yyerror("Bad attribute"); 1455 $$ = NULL; 1456 } 1457 | constant_expression 1458 ; 1459 1460 identifier_list: /* C99 6.7.5 */ 1461 T_NAME { 1462 $$ = old_style_function_parameter_name(getsym($1)); 1463 } 1464 | identifier_list T_COMMA T_NAME { 1465 $$ = concat_symbols($1, 1466 old_style_function_parameter_name(getsym($3))); 1467 } 1468 | identifier_list error 1469 ; 1470 1471 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1472 type_name: /* C99 6.7.6 */ 1473 { 1474 begin_declaration_level(DLK_ABSTRACT); 1475 } abstract_declaration { 1476 end_declaration_level(); 1477 $$ = $2->s_type; 1478 } 1479 ; 1480 1481 abstract_declaration: /* specific to lint */ 1482 begin_type_qualifier_list end_type { 1483 $$ = declare_abstract_type(abstract_name()); 1484 } 1485 | begin_type_specifier_qualifier_list end_type { 1486 $$ = declare_abstract_type(abstract_name()); 1487 } 1488 | begin_type_qualifier_list end_type abstract_declarator { 1489 $$ = declare_abstract_type($3); 1490 } 1491 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1492 $$ = declare_abstract_type($3); 1493 } 1494 ; 1495 1496 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1497 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1498 abstract_declarator: 1499 pointer { 1500 $$ = add_pointer(abstract_name(), $1); 1501 } 1502 | direct_abstract_declarator 1503 | pointer direct_abstract_declarator { 1504 $$ = add_pointer($2, $1); 1505 } 1506 | type_attribute_list direct_abstract_declarator { 1507 $$ = $2; 1508 } 1509 | pointer type_attribute_list direct_abstract_declarator { 1510 $$ = add_pointer($3, $1); 1511 } 1512 ; 1513 1514 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1515 direct_abstract_declarator: 1516 /* TODO: sort rules according to C99 */ 1517 T_LPAREN abstract_declarator T_RPAREN { 1518 $$ = $2; 1519 } 1520 | T_LBRACK array_size_opt T_RBRACK { 1521 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1522 } 1523 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1524 $$ = add_array($1, $3.has_dim, $3.dim); 1525 } 1526 | abstract_decl_param_list asm_or_symbolrename_opt { 1527 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1528 end_declaration_level(); 1529 block_level--; 1530 } 1531 | direct_abstract_declarator abstract_decl_param_list 1532 asm_or_symbolrename_opt { 1533 $$ = add_function(symbolrename($1, $3), $2); 1534 end_declaration_level(); 1535 block_level--; 1536 } 1537 | direct_abstract_declarator type_attribute_list 1538 ; 1539 1540 abstract_decl_param_list: /* specific to lint */ 1541 abstract_decl_lparen T_RPAREN type_attribute_opt { 1542 $$ = NULL; 1543 } 1544 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1545 type_attribute_opt { 1546 dcs->d_prototype = true; 1547 $$ = $2; 1548 } 1549 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1550 $$ = NULL; 1551 } 1552 ; 1553 1554 abstract_decl_lparen: /* specific to lint */ 1555 T_LPAREN { 1556 block_level++; 1557 begin_declaration_level(DLK_PROTO_PARAMS); 1558 } 1559 ; 1560 1561 vararg_parameter_type_list: /* specific to lint */ 1562 parameter_type_list 1563 | parameter_type_list T_COMMA T_ELLIPSIS { 1564 dcs->d_vararg = true; 1565 $$ = $1; 1566 } 1567 | T_ELLIPSIS { 1568 /* TODO: C99 6.7.5 makes this an error as well. */ 1569 if (!allow_trad && !allow_c99) { 1570 /* ANSI C requires formal parameter before '...' */ 1571 error(84); 1572 } else if (allow_c90) { 1573 /* ANSI C requires formal parameter before '...' */ 1574 warning(84); 1575 } 1576 dcs->d_vararg = true; 1577 $$ = NULL; 1578 } 1579 ; 1580 1581 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1582 parameter_type_list: 1583 parameter_declaration 1584 | parameter_type_list T_COMMA parameter_declaration { 1585 $$ = concat_symbols($1, $3); 1586 } 1587 ; 1588 1589 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1590 parameter_declaration: 1591 begin_type_declmods end_type { 1592 /* ^^ There is no check for the missing type-specifier. */ 1593 $$ = declare_argument(abstract_name(), false); 1594 } 1595 | begin_type_declaration_specifiers end_type { 1596 $$ = declare_argument(abstract_name(), false); 1597 } 1598 | begin_type_declmods end_type notype_param_declarator { 1599 /* ^^ There is no check for the missing type-specifier. */ 1600 $$ = declare_argument($3, false); 1601 } 1602 /* 1603 * type_param_declarator is needed because of following conflict: 1604 * "typedef int a; f(int (a));" could be parsed as 1605 * "function with argument a of type int", or 1606 * "function with an abstract argument of type function". 1607 * This grammar realizes the second case. 1608 */ 1609 | begin_type_declaration_specifiers end_type type_param_declarator { 1610 $$ = declare_argument($3, false); 1611 } 1612 | begin_type_declmods end_type abstract_declarator { 1613 /* ^^ There is no check for the missing type-specifier. */ 1614 $$ = declare_argument($3, false); 1615 } 1616 | begin_type_declaration_specifiers end_type abstract_declarator { 1617 $$ = declare_argument($3, false); 1618 } 1619 ; 1620 1621 braced_initializer: 1622 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1623 init_lbrace init_rbrace { 1624 /* empty initializer braces require C23 or later */ 1625 c23ism(353); 1626 } 1627 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1628 | init_lbrace initializer_list comma_opt init_rbrace 1629 ; 1630 1631 initializer: /* C99 6.7.8 "Initialization" */ 1632 assignment_expression { 1633 init_expr($1); 1634 } 1635 | init_lbrace init_rbrace { 1636 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1637 } 1638 | init_lbrace initializer_list comma_opt init_rbrace 1639 /* XXX: What is this error handling for? */ 1640 | error 1641 ; 1642 1643 initializer_list: /* C99 6.7.8 "Initialization" */ 1644 initializer_list_item 1645 | initializer_list T_COMMA initializer_list_item 1646 ; 1647 1648 initializer_list_item: /* helper */ 1649 designation initializer 1650 | initializer 1651 ; 1652 1653 designation: /* C99 6.7.8 "Initialization" */ 1654 begin_designation designator_list T_ASSIGN 1655 | identifier T_COLON { 1656 /* GCC style struct or union member name in initializer */ 1657 gnuism(315); 1658 begin_designation(); 1659 add_designator_member($1); 1660 } 1661 ; 1662 1663 begin_designation: /* lint-specific helper */ 1664 /* empty */ { 1665 begin_designation(); 1666 } 1667 ; 1668 1669 designator_list: /* C99 6.7.8 "Initialization" */ 1670 designator 1671 | designator_list designator 1672 ; 1673 1674 designator: /* C99 6.7.8 "Initialization" */ 1675 T_LBRACK range T_RBRACK { 1676 if (!allow_c99) 1677 /* array initializer with designators is a C99 ... */ 1678 warning(321); 1679 add_designator_subscript($2); 1680 } 1681 | T_POINT identifier { 1682 if (!allow_c99) 1683 /* struct or union member name in initializer is ... */ 1684 warning(313); 1685 add_designator_member($2); 1686 } 1687 ; 1688 1689 static_assert_declaration: 1690 T_STATIC_ASSERT T_LPAREN 1691 constant_expression T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1692 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI /* C23 */ 1693 ; 1694 1695 range: 1696 constant_expression { 1697 $$.lo = to_int_constant($1, true); 1698 $$.hi = $$.lo; 1699 } 1700 | constant_expression T_ELLIPSIS constant_expression { 1701 $$.lo = to_int_constant($1, true); 1702 $$.hi = to_int_constant($3, true); 1703 /* initialization with '[a...b]' is a GCC extension */ 1704 gnuism(340); 1705 } 1706 ; 1707 1708 init_lbrace: /* helper */ 1709 T_LBRACE { 1710 init_lbrace(); 1711 } 1712 ; 1713 1714 init_rbrace: /* helper */ 1715 T_RBRACE { 1716 init_rbrace(); 1717 } 1718 ; 1719 1720 asm_or_symbolrename_opt: /* GCC extensions */ 1721 /* empty */ { 1722 $$ = NULL; 1723 } 1724 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1725 freeyyv(&$3, T_STRING); 1726 $$ = NULL; 1727 } 1728 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1729 gcc_attribute_specifier_list_opt { 1730 $$ = $3; 1731 } 1732 ; 1733 1734 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1735 statement: 1736 expression_statement 1737 | non_expr_statement 1738 ; 1739 1740 non_expr_statement: /* helper for C99 6.8 */ 1741 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1742 | labeled_statement 1743 | compound_statement 1744 | selection_statement 1745 | iteration_statement 1746 | jump_statement { 1747 suppress_fallthrough = false; 1748 } 1749 | asm_statement 1750 ; 1751 1752 labeled_statement: /* C99 6.8.1 */ 1753 label gcc_attribute_specifier_list_opt statement 1754 ; 1755 1756 label: 1757 T_NAME T_COLON { 1758 set_symtyp(FLABEL); 1759 named_label(getsym($1)); 1760 } 1761 | T_CASE constant_expression T_COLON { 1762 case_label($2); 1763 suppress_fallthrough = true; 1764 } 1765 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1766 /* XXX: We don't fill all cases */ 1767 case_label($2); 1768 suppress_fallthrough = true; 1769 } 1770 | T_DEFAULT T_COLON { 1771 default_label(); 1772 suppress_fallthrough = true; 1773 } 1774 ; 1775 1776 compound_statement: /* C99 6.8.2 */ 1777 compound_statement_lbrace compound_statement_rbrace 1778 | compound_statement_lbrace block_item_list compound_statement_rbrace 1779 ; 1780 1781 compound_statement_lbrace: 1782 T_LBRACE { 1783 block_level++; 1784 mem_block_level++; 1785 begin_declaration_level(DLK_AUTO); 1786 } 1787 ; 1788 1789 compound_statement_rbrace: 1790 T_RBRACE { 1791 end_declaration_level(); 1792 level_free_all(mem_block_level); 1793 mem_block_level--; 1794 block_level--; 1795 suppress_fallthrough = false; 1796 } 1797 ; 1798 1799 block_item_list: /* C99 6.8.2 */ 1800 block_item 1801 | block_item_list block_item { 1802 if ($1 && !$2) 1803 /* declarations after statements is a C99 feature */ 1804 c99ism(327); 1805 $$ = $1 || $2; 1806 } 1807 ; 1808 1809 block_item: /* C99 6.8.2 */ 1810 declaration_or_error { 1811 $$ = false; 1812 restore_warning_flags(); 1813 } 1814 | statement { 1815 $$ = true; 1816 restore_warning_flags(); 1817 } 1818 ; 1819 1820 expression_statement: /* C99 6.8.3 */ 1821 expression T_SEMI { 1822 expr($1, false, false, false, false); 1823 suppress_fallthrough = false; 1824 } 1825 | T_SEMI { 1826 check_statement_reachable(); 1827 suppress_fallthrough = false; 1828 } 1829 ; 1830 1831 selection_statement: /* C99 6.8.4 */ 1832 if_without_else %prec T_THEN { 1833 save_warning_flags(); 1834 stmt_if_then_stmt(); 1835 stmt_if_else_stmt(false); 1836 } 1837 | if_without_else T_ELSE { 1838 save_warning_flags(); 1839 stmt_if_then_stmt(); 1840 } statement { 1841 clear_warning_flags(); 1842 stmt_if_else_stmt(true); 1843 } 1844 | if_without_else T_ELSE error { 1845 clear_warning_flags(); 1846 stmt_if_else_stmt(false); 1847 } 1848 | switch_expr statement { 1849 clear_warning_flags(); 1850 stmt_switch_expr_stmt(); 1851 } 1852 | switch_expr error { 1853 clear_warning_flags(); 1854 stmt_switch_expr_stmt(); 1855 } 1856 ; 1857 1858 if_without_else: /* see C99 6.8.4 */ 1859 if_expr statement 1860 | if_expr error 1861 ; 1862 1863 if_expr: /* see C99 6.8.4 */ 1864 T_IF T_LPAREN expression T_RPAREN { 1865 stmt_if_expr($3); 1866 clear_warning_flags(); 1867 } 1868 ; 1869 1870 switch_expr: /* see C99 6.8.4 */ 1871 T_SWITCH T_LPAREN expression T_RPAREN { 1872 stmt_switch_expr($3); 1873 clear_warning_flags(); 1874 } 1875 ; 1876 1877 iteration_statement: /* C99 6.8.5 */ 1878 while_expr statement { 1879 clear_warning_flags(); 1880 stmt_while_expr_stmt(); 1881 } 1882 | while_expr error { 1883 clear_warning_flags(); 1884 stmt_while_expr_stmt(); 1885 } 1886 | do_statement do_while_expr { 1887 stmt_do_while_expr($2); 1888 suppress_fallthrough = false; 1889 } 1890 | do error { 1891 clear_warning_flags(); 1892 stmt_do_while_expr(NULL); 1893 } 1894 | for_exprs statement { 1895 clear_warning_flags(); 1896 stmt_for_exprs_stmt(); 1897 end_declaration_level(); 1898 block_level--; 1899 } 1900 | for_exprs error { 1901 clear_warning_flags(); 1902 stmt_for_exprs_stmt(); 1903 end_declaration_level(); 1904 block_level--; 1905 } 1906 ; 1907 1908 while_expr: /* see C99 6.8.5 */ 1909 T_WHILE T_LPAREN expression T_RPAREN { 1910 stmt_while_expr($3); 1911 clear_warning_flags(); 1912 } 1913 ; 1914 1915 do_statement: /* see C99 6.8.5 */ 1916 do statement { 1917 clear_warning_flags(); 1918 } 1919 ; 1920 1921 do: /* see C99 6.8.5 */ 1922 T_DO { 1923 stmt_do(); 1924 } 1925 ; 1926 1927 do_while_expr: /* see C99 6.8.5 */ 1928 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1929 $$ = $3; 1930 } 1931 ; 1932 1933 for_start: /* see C99 6.8.5 */ 1934 T_FOR T_LPAREN { 1935 begin_declaration_level(DLK_AUTO); 1936 block_level++; 1937 } 1938 ; 1939 1940 for_exprs: /* see C99 6.8.5 */ 1941 for_start 1942 begin_type_declaration_specifiers end_type 1943 notype_init_declarators T_SEMI 1944 expression_opt T_SEMI 1945 expression_opt T_RPAREN { 1946 /* variable declaration in for loop */ 1947 c99ism(325); 1948 stmt_for_exprs(NULL, $6, $8); 1949 clear_warning_flags(); 1950 } 1951 | for_start 1952 expression_opt T_SEMI 1953 expression_opt T_SEMI 1954 expression_opt T_RPAREN { 1955 stmt_for_exprs($2, $4, $6); 1956 clear_warning_flags(); 1957 } 1958 ; 1959 1960 jump_statement: /* C99 6.8.6 */ 1961 goto identifier T_SEMI { 1962 stmt_goto(getsym($2)); 1963 } 1964 | goto error T_SEMI { 1965 set_symtyp(FVFT); 1966 } 1967 | T_CONTINUE T_SEMI { 1968 stmt_continue(); 1969 } 1970 | T_BREAK T_SEMI { 1971 stmt_break(); 1972 } 1973 | T_RETURN sys T_SEMI { 1974 stmt_return($2, NULL); 1975 } 1976 | T_RETURN sys expression T_SEMI { 1977 stmt_return($2, $3); 1978 } 1979 ; 1980 1981 goto: /* see C99 6.8.6 */ 1982 T_GOTO { 1983 set_symtyp(FLABEL); 1984 } 1985 ; 1986 1987 asm_statement: /* GCC extension */ 1988 T_ASM T_LPAREN read_until_rparen T_SEMI { 1989 dcs_set_asm(); 1990 } 1991 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 1992 dcs_set_asm(); 1993 } 1994 | T_ASM error 1995 ; 1996 1997 read_until_rparen: /* helper for 'asm_statement' */ 1998 /* empty */ { 1999 read_until_rparen(); 2000 } 2001 ; 2002 2003 translation_unit: /* C99 6.9 */ 2004 external_declaration 2005 | translation_unit external_declaration 2006 ; 2007 2008 external_declaration: /* C99 6.9 */ 2009 function_definition { 2010 global_clean_up_decl(false); 2011 clear_warning_flags(); 2012 } 2013 | top_level_declaration { 2014 global_clean_up_decl(false); 2015 clear_warning_flags(); 2016 } 2017 | asm_statement /* GCC extension */ 2018 | T_SEMI { /* GCC extension */ 2019 /* 2020 * TODO: Only allow this in GCC mode, not in plain C99. 2021 * This is one of the top 10 warnings in the NetBSD build. 2022 */ 2023 if (!allow_trad && !allow_c99) { 2024 /* empty declaration */ 2025 error(0); 2026 } else if (allow_c90) { 2027 /* empty declaration */ 2028 warning(0); 2029 } 2030 } 2031 ; 2032 2033 /* 2034 * On the top level, lint allows several forms of declarations that it doesn't 2035 * allow in functions. For example, a single ';' is an empty declaration and 2036 * is supported by some compilers, but in a function it would be an empty 2037 * statement, not a declaration. This makes a difference in C90 mode, where 2038 * a statement must not be followed by a declaration. 2039 * 2040 * See 'declaration' for all other declarations. 2041 */ 2042 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2043 begin_type end_type notype_init_declarators T_SEMI { 2044 /* TODO: Make this an error in C99 mode as well. */ 2045 if (!allow_trad && !allow_c99) { 2046 /* old-style declaration; add 'int' */ 2047 error(1); 2048 } else if (allow_c90) { 2049 /* old-style declaration; add 'int' */ 2050 warning(1); 2051 } 2052 } 2053 | declaration 2054 | error T_SEMI { 2055 global_clean_up(); 2056 } 2057 | error T_RBRACE { 2058 global_clean_up(); 2059 } 2060 ; 2061 2062 function_definition: /* C99 6.9.1 */ 2063 func_declarator { 2064 if ($1->s_type->t_tspec != FUNC) { 2065 /* syntax error '%s' */ 2066 error(249, yytext); 2067 YYERROR; 2068 } 2069 if ($1->s_type->t_typedef) { 2070 /* ()-less function definition */ 2071 error(64); 2072 YYERROR; 2073 } 2074 check_extern_declaration($1); 2075 begin_function($1); 2076 block_level++; 2077 begin_declaration_level(DLK_OLD_STYLE_ARGS); 2078 if (lwarn == LWARN_NONE) 2079 $1->s_used = true; 2080 } arg_declaration_list_opt { 2081 end_declaration_level(); 2082 block_level--; 2083 check_func_lint_directives(); 2084 check_func_old_style_arguments(); 2085 begin_control_statement(CS_FUNCTION_BODY); 2086 } compound_statement { 2087 end_function(); 2088 end_control_statement(CS_FUNCTION_BODY); 2089 } 2090 ; 2091 2092 func_declarator: 2093 begin_type end_type notype_declarator { 2094 if (!allow_trad) { 2095 /* old-style declaration; add 'int' */ 2096 error(1); 2097 } 2098 $$ = $3; 2099 } 2100 | begin_type_declmods end_type notype_declarator { 2101 if (!allow_trad) { 2102 /* old-style declaration; add 'int' */ 2103 error(1); 2104 } 2105 $$ = $3; 2106 } 2107 | begin_type_declaration_specifiers end_type type_declarator { 2108 $$ = $3; 2109 } 2110 ; 2111 2112 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2113 /* empty */ 2114 | arg_declaration_list 2115 ; 2116 2117 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2118 arg_declaration 2119 | arg_declaration_list arg_declaration 2120 /* XXX or better "arg_declaration error" ? */ 2121 | error 2122 ; 2123 2124 /* 2125 * "arg_declaration" is separated from "declaration" because it 2126 * needs other error handling. 2127 */ 2128 arg_declaration: 2129 begin_type_declmods end_type T_SEMI { 2130 /* empty declaration */ 2131 warning(2); 2132 } 2133 | begin_type_declmods end_type notype_init_declarators T_SEMI 2134 | begin_type_declaration_specifiers end_type T_SEMI { 2135 if (!dcs->d_nonempty_decl) { 2136 /* empty declaration */ 2137 warning(2); 2138 } else { 2139 /* '%s' declared in argument declaration list */ 2140 warning(3, type_name(dcs->d_type)); 2141 } 2142 } 2143 | begin_type_declaration_specifiers end_type 2144 type_init_declarators T_SEMI { 2145 if (dcs->d_nonempty_decl) { 2146 /* '%s' declared in argument declaration list */ 2147 warning(3, type_name(dcs->d_type)); 2148 } 2149 } 2150 | begin_type_declmods error 2151 | begin_type_declaration_specifiers error 2152 ; 2153 2154 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2155 gcc_attribute_specifier_list_opt: 2156 /* empty */ 2157 | gcc_attribute_specifier_list 2158 ; 2159 2160 gcc_attribute_specifier_list: 2161 gcc_attribute_specifier 2162 | gcc_attribute_specifier_list gcc_attribute_specifier 2163 ; 2164 2165 gcc_attribute_specifier: 2166 T_ATTRIBUTE T_LPAREN T_LPAREN { 2167 in_gcc_attribute = true; 2168 } gcc_attribute_list { 2169 in_gcc_attribute = false; 2170 } T_RPAREN T_RPAREN 2171 ; 2172 2173 gcc_attribute_list: 2174 gcc_attribute 2175 | gcc_attribute_list T_COMMA gcc_attribute 2176 ; 2177 2178 gcc_attribute: 2179 /* empty */ 2180 | T_NAME { 2181 const char *name = $1->sb_name; 2182 if (is_either(name, "packed", "__packed__")) 2183 dcs_add_packed(); 2184 else if (is_either(name, "used", "__used__") || 2185 is_either(name, "unused", "__unused__")) 2186 dcs_set_used(); 2187 else if (is_either(name, "fallthrough", "__fallthrough__")) 2188 suppress_fallthrough = true; 2189 } 2190 | T_NAME T_LPAREN T_RPAREN 2191 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2192 | type_qualifier { 2193 if (!$1.tq_const) 2194 yyerror("Bad attribute"); 2195 } 2196 ; 2197 2198 gcc_attribute_parameters: 2199 constant_expression 2200 | gcc_attribute_parameters T_COMMA constant_expression 2201 ; 2202 2203 sys: 2204 /* empty */ { 2205 $$ = in_system_header; 2206 } 2207 ; 2208 2209 %% 2210 2211 /* ARGSUSED */ 2212 int 2213 yyerror(const char *msg) 2214 { 2215 /* syntax error '%s' */ 2216 error(249, yytext); 2217 if (++sytxerr >= 5) 2218 norecover(); 2219 return 0; 2220 } 2221 2222 #if YYDEBUG && YYBYACC 2223 static const char * 2224 cgram_to_string(int token, YYSTYPE val) 2225 { 2226 2227 switch (token) { 2228 case T_INCDEC: 2229 case T_MULTIPLICATIVE: 2230 case T_ADDITIVE: 2231 case T_SHIFT: 2232 case T_RELATIONAL: 2233 case T_EQUALITY: 2234 case T_OPASSIGN: 2235 return op_name(val.y_op); 2236 case T_SCLASS: 2237 return scl_name(val.y_scl); 2238 case T_TYPE: 2239 case T_STRUCT_OR_UNION: 2240 return tspec_name(val.y_tspec); 2241 case T_QUAL: 2242 return type_qualifiers_string(val.y_type_qualifiers); 2243 case T_FUNCTION_SPECIFIER: 2244 return function_specifier_name(val.y_function_specifier); 2245 case T_NAME: 2246 return val.y_name->sb_name; 2247 default: 2248 return "<none>"; 2249 } 2250 } 2251 #endif 2252 2253 static void 2254 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2255 { 2256 declare(decl, has_initializer, renaming); 2257 if (renaming != NULL) 2258 freeyyv(&renaming, T_NAME); 2259 } 2260 2261 /* 2262 * Discard all input tokens up to and including the next 2263 * unmatched right paren 2264 */ 2265 static void 2266 read_until_rparen(void) 2267 { 2268 int level; 2269 2270 if (yychar < 0) 2271 yychar = yylex(); 2272 freeyyv(&yylval, yychar); 2273 2274 level = 1; 2275 while (yychar > 0) { 2276 if (yychar == T_LPAREN) 2277 level++; 2278 if (yychar == T_RPAREN && --level == 0) 2279 break; 2280 freeyyv(&yylval, yychar = yylex()); 2281 } 2282 2283 yyclearin; 2284 } 2285 2286 static sym_t * 2287 symbolrename(sym_t *s, sbuf_t *sb) 2288 { 2289 if (sb != NULL) 2290 s->s_rename = sb->sb_name; 2291 return s; 2292 } 2293
Indexes created Thu Oct 02 14:10:14 GMT 2025