cgram.y revision 1.450
1 %{ 2 /* $NetBSD: cgram.y,v 1.450 2023/07/10 19:04:52 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 1.450 2023/07/10 19:04:52 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", $$->u.floating); 162 } <y_val> 163 %printer { fprintf(yyo, "'%s'", $$->sb_name); } <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 fprintf(yyo, "%s '%s'", op_name($$->tn_op), type_name($$->tn_type)); 172 } <y_tnode> 173 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 174 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 175 %printer { 176 fprintf(yyo, "%s%s%s", 177 $$->p_const ? "const " : "", 178 $$->p_volatile ? "volatile " : "", 179 $$->p_pointer ? "*" : ""); 180 } <y_qual_ptr> 181 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 182 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 183 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 184 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 185 */ 186 187 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 188 %token T_POINT T_ARROW 189 %token T_COMPLEMENT T_LOGNOT 190 %token <y_op> T_INCDEC 191 %token T_SIZEOF 192 %token T_BUILTIN_OFFSETOF 193 %token T_TYPEOF 194 %token T_EXTENSION 195 %token T_ALIGNAS 196 %token T_ALIGNOF 197 %token T_ASTERISK 198 %token <y_op> T_MULTIPLICATIVE 199 %token <y_op> T_ADDITIVE 200 %token <y_op> T_SHIFT 201 %token <y_op> T_RELATIONAL 202 %token <y_op> T_EQUALITY 203 %token T_AMPER 204 %token T_BITXOR 205 %token T_BITOR 206 %token T_LOGAND 207 %token T_LOGOR 208 %token T_QUEST 209 %token T_COLON 210 %token T_ASSIGN 211 %token <y_op> T_OPASSIGN 212 %token T_COMMA 213 %token T_SEMI 214 %token T_ELLIPSIS 215 %token T_REAL 216 %token T_IMAG 217 %token T_GENERIC 218 %token T_NORETURN 219 220 /* storage classes (extern, static, auto, register and typedef) */ 221 %token <y_scl> T_SCLASS 222 223 /* 224 * predefined type keywords (char, int, short, long, unsigned, signed, 225 * float, double, void); see T_TYPENAME for types from typedef 226 */ 227 %token <y_tspec> T_TYPE 228 229 /* qualifiers (const, volatile, restrict, _Thread_local) */ 230 %token <y_tqual> T_QUAL 231 %token <y_tqual> T_ATOMIC 232 233 /* struct or union */ 234 %token <y_tspec> T_STRUCT_OR_UNION 235 236 /* remaining keywords */ 237 %token T_ASM 238 %token T_BREAK 239 %token T_CASE 240 %token T_CONTINUE 241 %token T_DEFAULT 242 %token T_DO 243 %token T_ELSE 244 %token T_ENUM 245 %token T_FOR 246 %token T_GOTO 247 %token T_IF 248 %token T_PACKED 249 %token T_RETURN 250 %token T_SWITCH 251 %token T_SYMBOLRENAME 252 %token T_WHILE 253 %token T_STATIC_ASSERT 254 255 %token T_ATTRIBUTE 256 257 %left T_THEN 258 %left T_ELSE 259 %right T_QUEST T_COLON 260 %left T_LOGOR 261 %left T_LOGAND 262 %left T_BITOR 263 %left T_BITXOR 264 %left T_AMPER 265 %left T_EQUALITY 266 %left T_RELATIONAL 267 %left T_SHIFT 268 %left T_ADDITIVE 269 %left T_ASTERISK T_MULTIPLICATIVE 270 271 %token <y_name> T_NAME 272 %token <y_name> T_TYPENAME 273 %token <y_val> T_CON 274 %token <y_string> T_STRING 275 276 /* No type for program. */ 277 %type <y_sym> identifier_sym 278 %type <y_name> identifier 279 %type <y_string> string 280 %type <y_tnode> primary_expression 281 %type <y_tnode> generic_selection 282 %type <y_generic> generic_assoc_list 283 %type <y_generic> generic_association 284 %type <y_tnode> postfix_expression 285 /* No type for comma_opt. */ 286 %type <y_tnode> gcc_statement_expr_list 287 %type <y_tnode> gcc_statement_expr_item 288 %type <y_op> point_or_arrow 289 %type <y_tnode> argument_expression_list 290 %type <y_tnode> unary_expression 291 %type <y_tnode> cast_expression 292 %type <y_tnode> expression_opt 293 %type <y_tnode> conditional_expression 294 %type <y_tnode> assignment_expression 295 %type <y_tnode> expression 296 %type <y_tnode> constant_expr 297 /* No type for declaration_or_error. */ 298 /* No type for declaration. */ 299 /* No type for begin_type_declaration_specifiers. */ 300 /* No type for begin_type_declmods. */ 301 /* No type for begin_type_specifier_qualifier_list. */ 302 /* No type for begin_type_specifier_qualifier_list_postfix. */ 303 %type <y_type> begin_type_typespec 304 /* No type for begin_type_qualifier_list. */ 305 /* No type for declmod. */ 306 /* No type for type_attribute_list_opt. */ 307 /* No type for type_attribute_list. */ 308 /* No type for type_attribute_opt. */ 309 /* No type for type_attribute. */ 310 /* No type for begin_type. */ 311 /* No type for end_type. */ 312 %type <y_type> type_specifier 313 %type <y_type> notype_type_specifier 314 %type <y_type> atomic_type_specifier 315 %type <y_type> struct_or_union_specifier 316 %type <y_tspec> struct_or_union 317 %type <y_sym> braced_struct_declaration_list 318 /* No type for struct_declaration_lbrace. */ 319 %type <y_sym> struct_declaration_list_with_rbrace 320 %type <y_sym> struct_declaration_list 321 %type <y_sym> struct_declaration 322 %type <y_sym> notype_struct_declarators 323 %type <y_sym> type_struct_declarators 324 %type <y_sym> notype_struct_declarator 325 %type <y_sym> type_struct_declarator 326 %type <y_type> enum_specifier 327 /* No type for enum. */ 328 %type <y_sym> enum_declaration 329 /* No type for enum_decl_lbrace. */ 330 %type <y_sym> enums_with_opt_comma 331 %type <y_sym> enumerator_list 332 %type <y_sym> enumerator 333 %type <y_tqual> type_qualifier 334 /* No type for atomic. */ 335 %type <y_qual_ptr> pointer 336 %type <y_qual_ptr> asterisk 337 %type <y_qual_ptr> type_qualifier_list_opt 338 %type <y_qual_ptr> type_qualifier_list 339 %type <y_qual_ptr> type_qualifier_list_elem 340 /* No type for notype_init_declarators. */ 341 /* No type for type_init_declarators. */ 342 /* No type for notype_init_declarator. */ 343 /* No type for type_init_declarator. */ 344 %type <y_sym> notype_declarator 345 %type <y_sym> type_declarator 346 %type <y_sym> notype_direct_declarator 347 %type <y_sym> type_direct_declarator 348 %type <y_sym> type_param_declarator 349 %type <y_sym> notype_param_declarator 350 %type <y_sym> direct_param_declarator 351 %type <y_sym> direct_notype_param_declarator 352 %type <y_sym> param_list 353 /* No type for id_list_lparen. */ 354 /* No type for abstract_decl_lparen. */ 355 %type <y_array_size> array_size_opt 356 %type <y_tnode> array_size 357 %type <y_sym> identifier_list 358 %type <y_type> type_name 359 %type <y_sym> abstract_declaration 360 %type <y_sym> abstract_declarator 361 %type <y_sym> direct_abstract_declarator 362 %type <y_sym> abstract_decl_param_list 363 /* No type for abstract_decl_lparen. */ 364 %type <y_sym> vararg_parameter_type_list 365 %type <y_sym> parameter_type_list 366 %type <y_sym> parameter_declaration 367 /* No type for braced_initializer. */ 368 /* No type for initializer. */ 369 /* No type for initializer_list. */ 370 /* No type for initializer_list_item. */ 371 /* No type for designation. */ 372 /* No type for begin_designation. */ 373 /* No type for designator_list. */ 374 /* No type for designator. */ 375 /* No type for static_assert_declaration. */ 376 %type <y_range> range 377 /* No type for init_lbrace. */ 378 /* No type for init_rbrace. */ 379 %type <y_name> asm_or_symbolrename_opt 380 /* No type for statement. */ 381 /* No type for non_expr_statement. */ 382 /* No type for labeled_statement. */ 383 /* No type for label. */ 384 /* No type for compound_statement. */ 385 /* No type for compound_statement_lbrace. */ 386 /* No type for compound_statement_rbrace. */ 387 %type <y_seen_statement> block_item_list 388 %type <y_seen_statement> block_item 389 /* No type for expression_statement. */ 390 /* No type for selection_statement. */ 391 /* No type for if_without_else. */ 392 /* No type for if_expr. */ 393 /* No type for switch_expr. */ 394 /* No type for iteration_statement. */ 395 /* No type for while_expr. */ 396 /* No type for do_statement. */ 397 /* No type for do. */ 398 %type <y_tnode> do_while_expr 399 /* No type for for_start. */ 400 /* No type for for_exprs. */ 401 /* No type for jump_statement. */ 402 /* No type for goto. */ 403 /* No type for asm_statement. */ 404 /* No type for read_until_rparen. */ 405 /* No type for translation_unit. */ 406 /* No type for external_declaration. */ 407 /* No type for top_level_declaration. */ 408 /* No type for function_definition. */ 409 %type <y_sym> func_declarator 410 /* No type for arg_declaration_list_opt. */ 411 /* No type for arg_declaration_list. */ 412 /* No type for arg_declaration. */ 413 /* No type for gcc_attribute_specifier_list_opt. */ 414 /* No type for gcc_attribute_specifier_list. */ 415 /* No type for gcc_attribute_specifier. */ 416 /* No type for gcc_attribute_list. */ 417 /* No type for gcc_attribute. */ 418 /* No type for gcc_attribute_parameters. */ 419 %type <y_in_system_header> sys 420 421 %% 422 423 program: 424 /* empty */ { 425 /* TODO: Make this an error in C99 mode as well. */ 426 if (!allow_trad && !allow_c99) { 427 /* empty translation unit */ 428 error(272); 429 } else if (allow_c90) { 430 /* empty translation unit */ 431 warning(272); 432 } 433 } 434 | translation_unit 435 ; 436 437 identifier_sym: /* helper for struct/union/enum */ 438 identifier { 439 $$ = getsym($1); 440 } 441 ; 442 443 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 444 identifier: 445 T_NAME { 446 debug_step("cgram: name '%s'", $1->sb_name); 447 $$ = $1; 448 } 449 | T_TYPENAME { 450 debug_step("cgram: typename '%s'", $1->sb_name); 451 $$ = $1; 452 } 453 ; 454 455 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 456 string: 457 T_STRING 458 | string T_STRING { 459 if (!allow_c90) { 460 /* concatenated strings are illegal in traditional C */ 461 warning(219); 462 } 463 $$ = cat_strings($1, $2); 464 } 465 ; 466 467 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 468 primary_expression: 469 T_NAME { 470 bool sys_name, sys_next; 471 sys_name = in_system_header; 472 if (yychar < 0) 473 yychar = yylex(); 474 sys_next = in_system_header; 475 in_system_header = sys_name; 476 $$ = build_name(getsym($1), yychar == T_LPAREN); 477 in_system_header = sys_next; 478 } 479 | T_CON { 480 $$ = build_constant(gettyp($1->v_tspec), $1); 481 } 482 | string { 483 $$ = build_string($1); 484 } 485 | T_LPAREN expression T_RPAREN { 486 if ($2 != NULL) 487 $2->tn_parenthesized = true; 488 $$ = $2; 489 } 490 | generic_selection 491 /* GCC primary-expression, see c_parser_postfix_expression */ 492 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 493 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 494 set_symtyp(FMEMBER); 495 $$ = build_offsetof($3, getsym($5)); 496 } 497 ; 498 499 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 500 generic_selection: 501 T_GENERIC T_LPAREN assignment_expression T_COMMA 502 generic_assoc_list T_RPAREN { 503 /* generic selection requires C11 or later */ 504 c11ism(345); 505 $$ = build_generic_selection($3, $5); 506 } 507 ; 508 509 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 510 generic_assoc_list: 511 generic_association 512 | generic_assoc_list T_COMMA generic_association { 513 $3->ga_prev = $1; 514 $$ = $3; 515 } 516 ; 517 518 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 519 generic_association: 520 type_name T_COLON assignment_expression { 521 $$ = block_zero_alloc(sizeof(*$$)); 522 $$->ga_arg = $1; 523 $$->ga_result = $3; 524 } 525 | T_DEFAULT T_COLON assignment_expression { 526 $$ = block_zero_alloc(sizeof(*$$)); 527 $$->ga_arg = NULL; 528 $$->ga_result = $3; 529 } 530 ; 531 532 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 533 postfix_expression: 534 primary_expression 535 | postfix_expression T_LBRACK sys expression T_RBRACK { 536 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 537 } 538 | postfix_expression T_LPAREN sys T_RPAREN { 539 $$ = build_function_call($1, $3, NULL); 540 } 541 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 542 $$ = build_function_call($1, $3, $4); 543 } 544 | postfix_expression point_or_arrow sys T_NAME { 545 $$ = build_member_access($1, $2, $3, $4); 546 } 547 | postfix_expression T_INCDEC sys { 548 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 549 } 550 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 551 sym_t *tmp = mktempsym($2); 552 begin_initialization(tmp); 553 cgram_declare(tmp, true, NULL); 554 } braced_initializer { 555 if (!allow_c99) 556 /* compound literals are a C99/GCC extension */ 557 gnuism(319); 558 $$ = build_name(current_initsym(), false); 559 end_initialization(); 560 } 561 | T_LPAREN compound_statement_lbrace { 562 begin_statement_expr(); 563 } gcc_statement_expr_list { 564 do_statement_expr($4); 565 } compound_statement_rbrace T_RPAREN { 566 $$ = end_statement_expr(); 567 } 568 ; 569 570 comma_opt: /* helper for 'postfix_expression' */ 571 /* empty */ 572 | T_COMMA 573 ; 574 575 /* 576 * The inner part of a GCC statement-expression of the form ({ ... }). 577 * 578 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 579 */ 580 gcc_statement_expr_list: 581 gcc_statement_expr_item 582 | gcc_statement_expr_list gcc_statement_expr_item { 583 $$ = $2; 584 } 585 ; 586 587 gcc_statement_expr_item: 588 declaration_or_error { 589 clear_warning_flags(); 590 $$ = NULL; 591 } 592 | non_expr_statement { 593 $$ = expr_alloc_tnode(); 594 $$->tn_type = gettyp(VOID); 595 } 596 | T_SEMI { 597 $$ = expr_alloc_tnode(); 598 $$->tn_type = gettyp(VOID); 599 } 600 | expression T_SEMI { 601 if ($1 == NULL) { /* in case of syntax errors */ 602 $$ = expr_alloc_tnode(); 603 $$->tn_type = gettyp(VOID); 604 } else { 605 /* XXX: do that only on the last name */ 606 if ($1->tn_op == NAME) 607 $1->tn_sym->s_used = true; 608 expr($1, false, false, false, false); 609 seen_fallthrough = false; 610 $$ = $1; 611 } 612 } 613 ; 614 615 point_or_arrow: /* helper for 'postfix_expression' */ 616 T_POINT { 617 set_symtyp(FMEMBER); 618 $$ = POINT; 619 } 620 | T_ARROW { 621 set_symtyp(FMEMBER); 622 $$ = ARROW; 623 } 624 ; 625 626 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 627 argument_expression_list: 628 assignment_expression { 629 $$ = build_function_argument(NULL, $1); 630 } 631 | argument_expression_list T_COMMA assignment_expression { 632 $$ = build_function_argument($1, $3); 633 } 634 ; 635 636 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 637 unary_expression: 638 postfix_expression 639 | T_INCDEC sys unary_expression { 640 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 641 } 642 | T_AMPER sys cast_expression { 643 $$ = build_unary(ADDR, $2, $3); 644 } 645 | T_ASTERISK sys cast_expression { 646 $$ = build_unary(INDIR, $2, $3); 647 } 648 | T_ADDITIVE sys cast_expression { 649 if (!allow_c90 && $1 == PLUS) { 650 /* unary '+' is illegal in traditional C */ 651 warning(100); 652 } 653 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 654 } 655 | T_COMPLEMENT sys cast_expression { 656 $$ = build_unary(COMPL, $2, $3); 657 } 658 | T_LOGNOT sys cast_expression { 659 $$ = build_unary(NOT, $2, $3); 660 } 661 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 662 $$ = build_unary(REAL, $2, $3); 663 } 664 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 665 $$ = build_unary(IMAG, $2, $3); 666 } 667 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 668 $$ = $2; 669 } 670 | T_SIZEOF unary_expression { 671 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 672 if ($$ != NULL) 673 check_expr_misc($2, 674 false, false, false, false, false, true); 675 } 676 | T_SIZEOF T_LPAREN type_name T_RPAREN { 677 $$ = build_sizeof($3); 678 } 679 | T_ALIGNOF unary_expression { 680 /* non type argument to alignof is a GCC extension */ 681 gnuism(349); 682 lint_assert($2 != NULL); 683 $$ = build_alignof($2->tn_type); 684 } 685 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 686 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 687 /* TODO: c11ism */ 688 $$ = build_alignof($3); 689 } 690 ; 691 692 /* The rule 'unary_operator' is inlined into unary_expression. */ 693 694 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 695 cast_expression: 696 unary_expression 697 | T_LPAREN type_name T_RPAREN cast_expression { 698 $$ = cast($4, $2); 699 } 700 ; 701 702 expression_opt: 703 /* empty */ { 704 $$ = NULL; 705 } 706 | expression 707 ; 708 709 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 710 /* 'conditional_expression' also implements 'additive_expression'. */ 711 /* 'conditional_expression' also implements 'shift_expression'. */ 712 /* 'conditional_expression' also implements 'relational_expression'. */ 713 /* 'conditional_expression' also implements 'equality_expression'. */ 714 /* 'conditional_expression' also implements 'AND_expression'. */ 715 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 716 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 717 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 718 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 719 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 720 conditional_expression: 721 cast_expression 722 | conditional_expression T_ASTERISK sys conditional_expression { 723 $$ = build_binary($1, MULT, $3, $4); 724 } 725 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 726 $$ = build_binary($1, $2, $3, $4); 727 } 728 | conditional_expression T_ADDITIVE sys conditional_expression { 729 $$ = build_binary($1, $2, $3, $4); 730 } 731 | conditional_expression T_SHIFT sys conditional_expression { 732 $$ = build_binary($1, $2, $3, $4); 733 } 734 | conditional_expression T_RELATIONAL sys conditional_expression { 735 $$ = build_binary($1, $2, $3, $4); 736 } 737 | conditional_expression T_EQUALITY sys conditional_expression { 738 $$ = build_binary($1, $2, $3, $4); 739 } 740 | conditional_expression T_AMPER sys conditional_expression { 741 $$ = build_binary($1, BITAND, $3, $4); 742 } 743 | conditional_expression T_BITXOR sys conditional_expression { 744 $$ = build_binary($1, BITXOR, $3, $4); 745 } 746 | conditional_expression T_BITOR sys conditional_expression { 747 $$ = build_binary($1, BITOR, $3, $4); 748 } 749 | conditional_expression T_LOGAND sys conditional_expression { 750 $$ = build_binary($1, LOGAND, $3, $4); 751 } 752 | conditional_expression T_LOGOR sys conditional_expression { 753 $$ = build_binary($1, LOGOR, $3, $4); 754 } 755 | conditional_expression T_QUEST sys 756 expression T_COLON sys conditional_expression { 757 $$ = build_binary($1, QUEST, $3, 758 build_binary($4, COLON, $6, $7)); 759 } 760 ; 761 762 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 763 assignment_expression: 764 conditional_expression 765 | unary_expression T_ASSIGN sys assignment_expression { 766 $$ = build_binary($1, ASSIGN, $3, $4); 767 } 768 | unary_expression T_OPASSIGN sys assignment_expression { 769 $$ = build_binary($1, $2, $3, $4); 770 } 771 ; 772 773 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 774 expression: 775 assignment_expression 776 | expression T_COMMA sys assignment_expression { 777 $$ = build_binary($1, COMMA, $3, $4); 778 } 779 ; 780 781 constant_expr: /* C99 6.6 */ 782 conditional_expression 783 ; 784 785 declaration_or_error: 786 declaration 787 | error T_SEMI 788 ; 789 790 declaration: /* C99 6.7 */ 791 begin_type_declmods end_type T_SEMI { 792 if (dcs->d_scl == TYPEDEF) { 793 /* typedef declares no type name */ 794 warning(72); 795 } else { 796 /* empty declaration */ 797 warning(2); 798 } 799 } 800 | begin_type_declmods end_type notype_init_declarators T_SEMI { 801 if (dcs->d_scl == TYPEDEF) { 802 /* syntax error '%s' */ 803 error(249, "missing base type for typedef"); 804 } else { 805 /* old-style declaration; add 'int' */ 806 error(1); 807 } 808 } 809 | begin_type_declaration_specifiers end_type T_SEMI { 810 if (dcs->d_scl == TYPEDEF) { 811 /* typedef declares no type name */ 812 warning(72); 813 } else if (!dcs->d_nonempty_decl) { 814 /* empty declaration */ 815 warning(2); 816 } 817 } 818 | begin_type_declaration_specifiers end_type 819 type_init_declarators T_SEMI 820 | static_assert_declaration 821 ; 822 823 begin_type_declaration_specifiers: /* see C99 6.7 */ 824 begin_type_typespec { 825 dcs_add_type($1); 826 } 827 | begin_type_declmods type_specifier { 828 dcs_add_type($2); 829 } 830 | type_attribute begin_type_declaration_specifiers 831 | begin_type_declaration_specifiers declmod 832 | begin_type_declaration_specifiers notype_type_specifier { 833 dcs_add_type($2); 834 } 835 ; 836 837 begin_type_declmods: /* see C99 6.7 */ 838 begin_type type_qualifier { 839 dcs_add_qualifier($2); 840 } 841 | begin_type T_SCLASS { 842 dcs_add_storage_class($2); 843 } 844 | begin_type_declmods declmod 845 ; 846 847 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 848 begin_type_specifier_qualifier_list_postfix 849 | type_attribute_list begin_type_specifier_qualifier_list_postfix 850 ; 851 852 begin_type_specifier_qualifier_list_postfix: 853 begin_type_typespec { 854 dcs_add_type($1); 855 } 856 | begin_type_qualifier_list type_specifier { 857 dcs_add_type($2); 858 } 859 | begin_type_specifier_qualifier_list_postfix type_qualifier { 860 dcs_add_qualifier($2); 861 } 862 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 863 dcs_add_type($2); 864 } 865 | begin_type_specifier_qualifier_list_postfix type_attribute 866 ; 867 868 begin_type_typespec: 869 begin_type notype_type_specifier { 870 $$ = $2; 871 } 872 | begin_type T_TYPENAME { 873 $$ = getsym($2)->s_type; 874 } 875 ; 876 877 begin_type_qualifier_list: 878 begin_type type_qualifier { 879 dcs_add_qualifier($2); 880 } 881 | begin_type_qualifier_list type_qualifier { 882 dcs_add_qualifier($2); 883 } 884 ; 885 886 declmod: 887 type_qualifier { 888 dcs_add_qualifier($1); 889 } 890 | T_SCLASS { 891 dcs_add_storage_class($1); 892 } 893 | type_attribute_list 894 ; 895 896 type_attribute_list_opt: 897 /* empty */ 898 | type_attribute_list 899 ; 900 901 type_attribute_list: 902 type_attribute 903 | type_attribute_list type_attribute 904 ; 905 906 type_attribute_opt: 907 /* empty */ 908 | type_attribute 909 ; 910 911 type_attribute: /* See C11 6.7 declaration-specifiers */ 912 gcc_attribute_specifier 913 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 914 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 915 | T_PACKED { 916 dcs_add_packed(); 917 } 918 | T_NORETURN 919 ; 920 921 begin_type: 922 /* empty */ { 923 dcs_begin_type(); 924 } 925 ; 926 927 end_type: 928 /* empty */ { 929 dcs_end_type(); 930 } 931 ; 932 933 type_specifier: /* C99 6.7.2 */ 934 notype_type_specifier 935 | T_TYPENAME { 936 $$ = getsym($1)->s_type; 937 } 938 ; 939 940 notype_type_specifier: /* see C99 6.7.2 */ 941 T_TYPE { 942 $$ = gettyp($1); 943 } 944 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 945 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 946 $$->t_typeof = true; 947 } 948 | atomic_type_specifier 949 | struct_or_union_specifier { 950 end_declaration_level(); 951 $$ = $1; 952 } 953 | enum_specifier { 954 end_declaration_level(); 955 $$ = $1; 956 } 957 ; 958 959 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 960 atomic_type_specifier: 961 atomic T_LPAREN type_name T_RPAREN { 962 $$ = $3; 963 } 964 ; 965 966 struct_or_union_specifier: /* C99 6.7.2.1 */ 967 struct_or_union identifier_sym { 968 /* 969 * STDC requires that "struct a;" always introduces 970 * a new tag if "a" is not declared at current level 971 * 972 * yychar is valid because otherwise the parser would not 973 * have been able to decide if it must shift or reduce 974 */ 975 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 976 } 977 | struct_or_union identifier_sym { 978 dcs->d_tag_type = make_tag_type($2, $1, true, false); 979 } braced_struct_declaration_list { 980 $$ = complete_struct_or_union($4); 981 } 982 | struct_or_union { 983 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 984 } braced_struct_declaration_list { 985 $$ = complete_struct_or_union($3); 986 } 987 | struct_or_union error { 988 set_symtyp(FVFT); 989 $$ = gettyp(INT); 990 } 991 ; 992 993 struct_or_union: /* C99 6.7.2.1 */ 994 T_STRUCT_OR_UNION { 995 set_symtyp(FTAG); 996 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 997 dcs->d_sou_size_in_bits = 0; 998 dcs->d_sou_align_in_bits = CHAR_SIZE; 999 $$ = $1; 1000 } 1001 | struct_or_union type_attribute 1002 ; 1003 1004 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 1005 struct_declaration_lbrace struct_declaration_list_with_rbrace { 1006 $$ = $2; 1007 } 1008 ; 1009 1010 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 1011 T_LBRACE { 1012 set_symtyp(FVFT); 1013 } 1014 ; 1015 1016 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1017 struct_declaration_list T_RBRACE 1018 | T_RBRACE { 1019 /* XXX: This is not allowed by any C standard. */ 1020 $$ = NULL; 1021 } 1022 ; 1023 1024 struct_declaration_list: /* C99 6.7.2.1 */ 1025 struct_declaration 1026 | struct_declaration_list struct_declaration { 1027 $$ = concat_symbols($1, $2); 1028 } 1029 ; 1030 1031 struct_declaration: /* C99 6.7.2.1 */ 1032 begin_type_qualifier_list end_type { 1033 /* ^^ There is no check for the missing type-specifier. */ 1034 /* too late, i know, but getsym() compensates it */ 1035 set_symtyp(FMEMBER); 1036 } notype_struct_declarators type_attribute_opt T_SEMI { 1037 set_symtyp(FVFT); 1038 $$ = $4; 1039 } 1040 | begin_type_specifier_qualifier_list end_type { 1041 set_symtyp(FMEMBER); 1042 } type_struct_declarators type_attribute_opt T_SEMI { 1043 set_symtyp(FVFT); 1044 $$ = $4; 1045 } 1046 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1047 /* syntax error '%s' */ 1048 error(249, "member without type"); 1049 $$ = NULL; 1050 } 1051 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1052 T_SEMI { 1053 set_symtyp(FVFT); 1054 if (!allow_c11 && !allow_gcc) 1055 /* anonymous struct/union members is a C11 feature */ 1056 warning(49); 1057 if (is_struct_or_union(dcs->d_type->t_tspec)) 1058 $$ = declare_unnamed_member(); 1059 else { 1060 /* syntax error '%s' */ 1061 error(249, "unnamed member"); 1062 $$ = NULL; 1063 } 1064 } 1065 | static_assert_declaration { 1066 $$ = NULL; 1067 } 1068 | error T_SEMI { 1069 set_symtyp(FVFT); 1070 $$ = NULL; 1071 } 1072 ; 1073 1074 notype_struct_declarators: 1075 notype_struct_declarator { 1076 $$ = declare_member($1); 1077 } 1078 | notype_struct_declarators { 1079 set_symtyp(FMEMBER); 1080 } T_COMMA type_struct_declarator { 1081 $$ = concat_symbols($1, declare_member($4)); 1082 } 1083 ; 1084 1085 type_struct_declarators: 1086 type_struct_declarator { 1087 $$ = declare_member($1); 1088 } 1089 | type_struct_declarators { 1090 set_symtyp(FMEMBER); 1091 } T_COMMA type_struct_declarator { 1092 $$ = concat_symbols($1, declare_member($4)); 1093 } 1094 ; 1095 1096 notype_struct_declarator: 1097 notype_declarator 1098 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1099 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1100 } 1101 | { 1102 set_symtyp(FVFT); 1103 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1104 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1105 } 1106 ; 1107 1108 type_struct_declarator: 1109 type_declarator 1110 | type_declarator T_COLON constant_expr { 1111 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1112 } 1113 | { 1114 set_symtyp(FVFT); 1115 } T_COLON constant_expr { 1116 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1117 } 1118 ; 1119 1120 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1121 enum_specifier: /* C99 6.7.2.2 */ 1122 enum gcc_attribute_specifier_list_opt identifier_sym { 1123 $$ = make_tag_type($3, ENUM, false, false); 1124 } 1125 | enum gcc_attribute_specifier_list_opt identifier_sym { 1126 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1127 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1128 $$ = complete_enum($5); 1129 } 1130 | enum gcc_attribute_specifier_list_opt { 1131 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1132 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1133 $$ = complete_enum($4); 1134 } 1135 | enum error { 1136 set_symtyp(FVFT); 1137 $$ = gettyp(INT); 1138 } 1139 ; 1140 1141 enum: /* helper for C99 6.7.2.2 */ 1142 T_ENUM { 1143 set_symtyp(FTAG); 1144 begin_declaration_level(DLK_ENUM); 1145 } 1146 ; 1147 1148 enum_declaration: /* helper for C99 6.7.2.2 */ 1149 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1150 $$ = $2; 1151 } 1152 ; 1153 1154 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1155 T_LBRACE { 1156 set_symtyp(FVFT); 1157 enumval = 0; 1158 } 1159 ; 1160 1161 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1162 enumerator_list 1163 | enumerator_list T_COMMA { 1164 if (!allow_c99 && !allow_trad) { 1165 /* trailing ',' prohibited in enum declaration */ 1166 error(54); 1167 } else { 1168 /* trailing ',' prohibited in enum declaration */ 1169 c99ism(54); 1170 } 1171 $$ = $1; 1172 } 1173 ; 1174 1175 enumerator_list: /* C99 6.7.2.2 */ 1176 enumerator 1177 | enumerator_list T_COMMA enumerator { 1178 $$ = concat_symbols($1, $3); 1179 } 1180 | error { 1181 $$ = NULL; 1182 } 1183 ; 1184 1185 enumerator: /* C99 6.7.2.2 */ 1186 identifier_sym gcc_attribute_specifier_list_opt { 1187 $$ = enumeration_constant($1, enumval, true); 1188 } 1189 | identifier_sym gcc_attribute_specifier_list_opt 1190 T_ASSIGN constant_expr { 1191 $$ = enumeration_constant($1, to_int_constant($4, true), 1192 false); 1193 } 1194 ; 1195 1196 type_qualifier: /* C99 6.7.3 */ 1197 T_QUAL 1198 | atomic { 1199 $$ = ATOMIC; 1200 } 1201 ; 1202 1203 atomic: /* helper */ 1204 T_ATOMIC { 1205 /* TODO: First fix c11ism, then use it here. */ 1206 if (!allow_c11) 1207 /* '_Atomic' requires C11 or later */ 1208 error(350); 1209 } 1210 ; 1211 1212 pointer: /* C99 6.7.5 */ 1213 asterisk type_qualifier_list_opt { 1214 $$ = merge_qualified_pointer($1, $2); 1215 } 1216 | asterisk type_qualifier_list_opt pointer { 1217 $$ = merge_qualified_pointer($1, $2); 1218 $$ = merge_qualified_pointer($$, $3); 1219 } 1220 ; 1221 1222 asterisk: /* helper for 'pointer' */ 1223 T_ASTERISK { 1224 $$ = xcalloc(1, sizeof(*$$)); 1225 $$->p_pointer = true; 1226 } 1227 ; 1228 1229 type_qualifier_list_opt: /* see C99 6.7.5 */ 1230 /* empty */ { 1231 $$ = NULL; 1232 } 1233 | type_qualifier_list 1234 ; 1235 1236 type_qualifier_list: /* C99 6.7.5 */ 1237 type_qualifier_list_elem 1238 | type_qualifier_list type_qualifier_list_elem { 1239 $$ = merge_qualified_pointer($1, $2); 1240 } 1241 ; 1242 1243 type_qualifier_list_elem: /* helper for 'pointer' */ 1244 type_qualifier { 1245 $$ = xcalloc(1, sizeof(*$$)); 1246 if ($1 == CONST) 1247 $$->p_const = true; 1248 if ($1 == VOLATILE) 1249 $$->p_volatile = true; 1250 } 1251 ; 1252 1253 /* 1254 * For an explanation of 'notype' in the following rules, see 1255 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1256 */ 1257 1258 notype_init_declarators: 1259 notype_init_declarator 1260 | notype_init_declarators T_COMMA type_init_declarator 1261 ; 1262 1263 type_init_declarators: 1264 type_init_declarator 1265 | type_init_declarators T_COMMA type_init_declarator 1266 ; 1267 1268 notype_init_declarator: 1269 notype_declarator asm_or_symbolrename_opt { 1270 cgram_declare($1, false, $2); 1271 check_size($1); 1272 } 1273 | notype_declarator asm_or_symbolrename_opt { 1274 begin_initialization($1); 1275 cgram_declare($1, true, $2); 1276 } T_ASSIGN initializer { 1277 check_size($1); 1278 end_initialization(); 1279 } 1280 ; 1281 1282 type_init_declarator: 1283 type_declarator asm_or_symbolrename_opt { 1284 cgram_declare($1, false, $2); 1285 check_size($1); 1286 } 1287 | type_declarator asm_or_symbolrename_opt { 1288 begin_initialization($1); 1289 cgram_declare($1, true, $2); 1290 } T_ASSIGN initializer { 1291 check_size($1); 1292 end_initialization(); 1293 } 1294 ; 1295 1296 notype_declarator: 1297 notype_direct_declarator 1298 | pointer notype_direct_declarator { 1299 $$ = add_pointer($2, $1); 1300 } 1301 ; 1302 1303 type_declarator: 1304 type_direct_declarator 1305 | pointer type_direct_declarator { 1306 $$ = add_pointer($2, $1); 1307 } 1308 ; 1309 1310 notype_direct_declarator: 1311 type_attribute_list_opt T_NAME { 1312 $$ = declarator_name(getsym($2)); 1313 } 1314 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1315 $$ = $3; 1316 } 1317 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1318 $$ = add_array($1, $3.has_dim, $3.dim); 1319 } 1320 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1321 $$ = add_function(symbolrename($1, $3), $2); 1322 end_declaration_level(); 1323 block_level--; 1324 } 1325 | notype_direct_declarator type_attribute 1326 ; 1327 1328 type_direct_declarator: 1329 type_attribute_list_opt identifier { 1330 $$ = declarator_name(getsym($2)); 1331 } 1332 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1333 $$ = $3; 1334 } 1335 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1336 $$ = add_array($1, $3.has_dim, $3.dim); 1337 } 1338 | type_direct_declarator param_list asm_or_symbolrename_opt { 1339 $$ = add_function(symbolrename($1, $3), $2); 1340 end_declaration_level(); 1341 block_level--; 1342 } 1343 | type_direct_declarator type_attribute 1344 ; 1345 1346 /* 1347 * The two distinct rules type_param_declarator and notype_param_declarator 1348 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1349 * always treated as a typename, not an argument name. For example, after 1350 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1351 * "f(int (double));", not "f(int a);". 1352 */ 1353 type_param_declarator: 1354 direct_param_declarator 1355 | pointer direct_param_declarator { 1356 $$ = add_pointer($2, $1); 1357 } 1358 ; 1359 1360 notype_param_declarator: 1361 direct_notype_param_declarator 1362 | pointer direct_notype_param_declarator { 1363 $$ = add_pointer($2, $1); 1364 } 1365 ; 1366 1367 direct_param_declarator: 1368 identifier type_attribute_list { 1369 $$ = declarator_name(getsym($1)); 1370 } 1371 | identifier { 1372 $$ = declarator_name(getsym($1)); 1373 } 1374 | T_LPAREN notype_param_declarator T_RPAREN { 1375 $$ = $2; 1376 } 1377 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1378 gcc_attribute_specifier_list_opt { 1379 $$ = add_array($1, $3.has_dim, $3.dim); 1380 } 1381 | direct_param_declarator param_list asm_or_symbolrename_opt { 1382 $$ = add_function(symbolrename($1, $3), $2); 1383 end_declaration_level(); 1384 block_level--; 1385 } 1386 ; 1387 1388 direct_notype_param_declarator: 1389 identifier { 1390 $$ = declarator_name(getsym($1)); 1391 } 1392 | T_LPAREN notype_param_declarator T_RPAREN { 1393 $$ = $2; 1394 } 1395 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1396 $$ = add_array($1, $3.has_dim, $3.dim); 1397 } 1398 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1399 $$ = add_function(symbolrename($1, $3), $2); 1400 end_declaration_level(); 1401 block_level--; 1402 } 1403 ; 1404 1405 param_list: 1406 id_list_lparen identifier_list T_RPAREN { 1407 $$ = $2; 1408 } 1409 | abstract_decl_param_list 1410 ; 1411 1412 id_list_lparen: 1413 T_LPAREN { 1414 block_level++; 1415 begin_declaration_level(DLK_PROTO_PARAMS); 1416 } 1417 ; 1418 1419 array_size_opt: 1420 /* empty */ { 1421 $$.has_dim = false; 1422 $$.dim = 0; 1423 } 1424 | T_ASTERISK { 1425 /* since C99; variable length array of unspecified size */ 1426 $$.has_dim = false; /* TODO: maybe change to true */ 1427 $$.dim = 0; /* just as a placeholder */ 1428 } 1429 | array_size { 1430 $$.has_dim = true; 1431 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1432 } 1433 ; 1434 1435 array_size: 1436 type_qualifier_list_opt T_SCLASS constant_expr { 1437 /* C11 6.7.6.3p7 */ 1438 if ($2 != STATIC) 1439 yyerror("Bad attribute"); 1440 /* static array size is a C11 extension */ 1441 c11ism(343); 1442 $$ = $3; 1443 } 1444 | type_qualifier { 1445 /* C11 6.7.6.2 */ 1446 if ($1 != RESTRICT) 1447 yyerror("Bad attribute"); 1448 $$ = NULL; 1449 } 1450 | constant_expr 1451 ; 1452 1453 identifier_list: /* C99 6.7.5 */ 1454 T_NAME { 1455 $$ = old_style_function_parameter_name(getsym($1)); 1456 } 1457 | identifier_list T_COMMA T_NAME { 1458 $$ = concat_symbols($1, 1459 old_style_function_parameter_name(getsym($3))); 1460 } 1461 | identifier_list error 1462 ; 1463 1464 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1465 type_name: /* C99 6.7.6 */ 1466 { 1467 begin_declaration_level(DLK_ABSTRACT); 1468 } abstract_declaration { 1469 end_declaration_level(); 1470 $$ = $2->s_type; 1471 } 1472 ; 1473 1474 abstract_declaration: /* specific to lint */ 1475 begin_type_qualifier_list end_type { 1476 $$ = declare_abstract_type(abstract_name()); 1477 } 1478 | begin_type_specifier_qualifier_list end_type { 1479 $$ = declare_abstract_type(abstract_name()); 1480 } 1481 | begin_type_qualifier_list end_type abstract_declarator { 1482 $$ = declare_abstract_type($3); 1483 } 1484 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1485 $$ = declare_abstract_type($3); 1486 } 1487 ; 1488 1489 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1490 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1491 abstract_declarator: 1492 pointer { 1493 $$ = add_pointer(abstract_name(), $1); 1494 } 1495 | direct_abstract_declarator 1496 | pointer direct_abstract_declarator { 1497 $$ = add_pointer($2, $1); 1498 } 1499 | type_attribute_list direct_abstract_declarator { 1500 $$ = $2; 1501 } 1502 | pointer type_attribute_list direct_abstract_declarator { 1503 $$ = add_pointer($3, $1); 1504 } 1505 ; 1506 1507 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1508 direct_abstract_declarator: 1509 /* TODO: sort rules according to C99 */ 1510 T_LPAREN abstract_declarator T_RPAREN { 1511 $$ = $2; 1512 } 1513 | T_LBRACK array_size_opt T_RBRACK { 1514 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1515 } 1516 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1517 $$ = add_array($1, $3.has_dim, $3.dim); 1518 } 1519 | abstract_decl_param_list asm_or_symbolrename_opt { 1520 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1521 end_declaration_level(); 1522 block_level--; 1523 } 1524 | direct_abstract_declarator abstract_decl_param_list 1525 asm_or_symbolrename_opt { 1526 $$ = add_function(symbolrename($1, $3), $2); 1527 end_declaration_level(); 1528 block_level--; 1529 } 1530 | direct_abstract_declarator type_attribute_list 1531 ; 1532 1533 abstract_decl_param_list: /* specific to lint */ 1534 abstract_decl_lparen T_RPAREN type_attribute_opt { 1535 $$ = NULL; 1536 } 1537 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1538 type_attribute_opt { 1539 dcs->d_prototype = true; 1540 $$ = $2; 1541 } 1542 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1543 $$ = NULL; 1544 } 1545 ; 1546 1547 abstract_decl_lparen: /* specific to lint */ 1548 T_LPAREN { 1549 block_level++; 1550 begin_declaration_level(DLK_PROTO_PARAMS); 1551 } 1552 ; 1553 1554 vararg_parameter_type_list: /* specific to lint */ 1555 parameter_type_list 1556 | parameter_type_list T_COMMA T_ELLIPSIS { 1557 dcs->d_vararg = true; 1558 $$ = $1; 1559 } 1560 | T_ELLIPSIS { 1561 /* TODO: C99 6.7.5 makes this an error as well. */ 1562 if (!allow_trad && !allow_c99) { 1563 /* ANSI C requires formal parameter before '...' */ 1564 error(84); 1565 } else if (allow_c90) { 1566 /* ANSI C requires formal parameter before '...' */ 1567 warning(84); 1568 } 1569 dcs->d_vararg = true; 1570 $$ = NULL; 1571 } 1572 ; 1573 1574 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1575 parameter_type_list: 1576 parameter_declaration 1577 | parameter_type_list T_COMMA parameter_declaration { 1578 $$ = concat_symbols($1, $3); 1579 } 1580 ; 1581 1582 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1583 parameter_declaration: 1584 begin_type_declmods end_type { 1585 /* ^^ There is no check for the missing type-specifier. */ 1586 $$ = declare_argument(abstract_name(), false); 1587 } 1588 | begin_type_declaration_specifiers end_type { 1589 $$ = declare_argument(abstract_name(), false); 1590 } 1591 | begin_type_declmods end_type notype_param_declarator { 1592 /* ^^ There is no check for the missing type-specifier. */ 1593 $$ = declare_argument($3, false); 1594 } 1595 /* 1596 * type_param_declarator is needed because of following conflict: 1597 * "typedef int a; f(int (a));" could be parsed as 1598 * "function with argument a of type int", or 1599 * "function with an abstract argument of type function". 1600 * This grammar realizes the second case. 1601 */ 1602 | begin_type_declaration_specifiers end_type type_param_declarator { 1603 $$ = declare_argument($3, false); 1604 } 1605 | begin_type_declmods end_type abstract_declarator { 1606 /* ^^ There is no check for the missing type-specifier. */ 1607 $$ = declare_argument($3, false); 1608 } 1609 | begin_type_declaration_specifiers end_type abstract_declarator { 1610 $$ = declare_argument($3, false); 1611 } 1612 ; 1613 1614 braced_initializer: 1615 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1616 init_lbrace init_rbrace { 1617 /* empty initializer braces require C23 or later */ 1618 c23ism(353); 1619 } 1620 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1621 | init_lbrace initializer_list comma_opt init_rbrace 1622 ; 1623 1624 initializer: /* C99 6.7.8 "Initialization" */ 1625 assignment_expression { 1626 init_expr($1); 1627 } 1628 | init_lbrace init_rbrace { 1629 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1630 } 1631 | init_lbrace initializer_list comma_opt init_rbrace 1632 /* XXX: What is this error handling for? */ 1633 | error 1634 ; 1635 1636 initializer_list: /* C99 6.7.8 "Initialization" */ 1637 initializer_list_item 1638 | initializer_list T_COMMA initializer_list_item 1639 ; 1640 1641 initializer_list_item: /* helper */ 1642 designation initializer 1643 | initializer 1644 ; 1645 1646 designation: /* C99 6.7.8 "Initialization" */ 1647 begin_designation designator_list T_ASSIGN 1648 | identifier T_COLON { 1649 /* GCC style struct or union member name in initializer */ 1650 gnuism(315); 1651 begin_designation(); 1652 add_designator_member($1); 1653 } 1654 ; 1655 1656 begin_designation: /* lint-specific helper */ 1657 /* empty */ { 1658 begin_designation(); 1659 } 1660 ; 1661 1662 designator_list: /* C99 6.7.8 "Initialization" */ 1663 designator 1664 | designator_list designator 1665 ; 1666 1667 designator: /* C99 6.7.8 "Initialization" */ 1668 T_LBRACK range T_RBRACK { 1669 if (!allow_c99) 1670 /* array initializer with designators is a C99 ... */ 1671 warning(321); 1672 add_designator_subscript($2); 1673 } 1674 | T_POINT identifier { 1675 if (!allow_c99) 1676 /* struct or union member name in initializer is ... */ 1677 warning(313); 1678 add_designator_member($2); 1679 } 1680 ; 1681 1682 static_assert_declaration: 1683 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1684 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1685 ; 1686 1687 range: 1688 constant_expr { 1689 $$.lo = to_int_constant($1, true); 1690 $$.hi = $$.lo; 1691 } 1692 | constant_expr T_ELLIPSIS constant_expr { 1693 $$.lo = to_int_constant($1, true); 1694 $$.hi = to_int_constant($3, true); 1695 /* initialization with '[a...b]' is a GCC extension */ 1696 gnuism(340); 1697 } 1698 ; 1699 1700 init_lbrace: /* helper */ 1701 T_LBRACE { 1702 init_lbrace(); 1703 } 1704 ; 1705 1706 init_rbrace: /* helper */ 1707 T_RBRACE { 1708 init_rbrace(); 1709 } 1710 ; 1711 1712 asm_or_symbolrename_opt: /* GCC extensions */ 1713 /* empty */ { 1714 $$ = NULL; 1715 } 1716 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1717 freeyyv(&$3, T_STRING); 1718 $$ = NULL; 1719 } 1720 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1721 gcc_attribute_specifier_list_opt { 1722 $$ = $3; 1723 } 1724 ; 1725 1726 statement: /* C99 6.8 */ 1727 expression_statement 1728 | non_expr_statement 1729 ; 1730 1731 non_expr_statement: /* helper for C99 6.8 */ 1732 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1733 | labeled_statement 1734 | compound_statement 1735 | selection_statement 1736 | iteration_statement 1737 | jump_statement { 1738 seen_fallthrough = false; 1739 } 1740 | asm_statement 1741 ; 1742 1743 labeled_statement: /* C99 6.8.1 */ 1744 label gcc_attribute_specifier_list_opt statement 1745 ; 1746 1747 label: 1748 T_NAME T_COLON { 1749 set_symtyp(FLABEL); 1750 named_label(getsym($1)); 1751 } 1752 | T_CASE constant_expr T_COLON { 1753 case_label($2); 1754 seen_fallthrough = true; 1755 } 1756 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1757 /* XXX: We don't fill all cases */ 1758 case_label($2); 1759 seen_fallthrough = true; 1760 } 1761 | T_DEFAULT T_COLON { 1762 default_label(); 1763 seen_fallthrough = true; 1764 } 1765 ; 1766 1767 compound_statement: /* C99 6.8.2 */ 1768 compound_statement_lbrace compound_statement_rbrace 1769 | compound_statement_lbrace block_item_list compound_statement_rbrace 1770 ; 1771 1772 compound_statement_lbrace: 1773 T_LBRACE { 1774 block_level++; 1775 mem_block_level++; 1776 begin_declaration_level(DLK_AUTO); 1777 } 1778 ; 1779 1780 compound_statement_rbrace: 1781 T_RBRACE { 1782 end_declaration_level(); 1783 level_free_all(mem_block_level); 1784 mem_block_level--; 1785 block_level--; 1786 seen_fallthrough = false; 1787 } 1788 ; 1789 1790 block_item_list: /* C99 6.8.2 */ 1791 block_item 1792 | block_item_list block_item { 1793 if ($1 && !$2) 1794 /* declarations after statements is a C99 feature */ 1795 c99ism(327); 1796 $$ = $1 || $2; 1797 } 1798 ; 1799 1800 block_item: /* C99 6.8.2 */ 1801 declaration_or_error { 1802 $$ = false; 1803 restore_warning_flags(); 1804 } 1805 | statement { 1806 $$ = true; 1807 restore_warning_flags(); 1808 } 1809 ; 1810 1811 expression_statement: /* C99 6.8.3 */ 1812 expression T_SEMI { 1813 expr($1, false, false, false, false); 1814 seen_fallthrough = false; 1815 } 1816 | T_SEMI { 1817 check_statement_reachable(); 1818 seen_fallthrough = false; 1819 } 1820 ; 1821 1822 selection_statement: /* C99 6.8.4 */ 1823 if_without_else %prec T_THEN { 1824 save_warning_flags(); 1825 stmt_if_then_stmt(); 1826 stmt_if_else_stmt(false); 1827 } 1828 | if_without_else T_ELSE { 1829 save_warning_flags(); 1830 stmt_if_then_stmt(); 1831 } statement { 1832 clear_warning_flags(); 1833 stmt_if_else_stmt(true); 1834 } 1835 | if_without_else T_ELSE error { 1836 clear_warning_flags(); 1837 stmt_if_else_stmt(false); 1838 } 1839 | switch_expr statement { 1840 clear_warning_flags(); 1841 stmt_switch_expr_stmt(); 1842 } 1843 | switch_expr error { 1844 clear_warning_flags(); 1845 stmt_switch_expr_stmt(); 1846 } 1847 ; 1848 1849 if_without_else: /* see C99 6.8.4 */ 1850 if_expr statement 1851 | if_expr error 1852 ; 1853 1854 if_expr: /* see C99 6.8.4 */ 1855 T_IF T_LPAREN expression T_RPAREN { 1856 stmt_if_expr($3); 1857 clear_warning_flags(); 1858 } 1859 ; 1860 1861 switch_expr: /* see C99 6.8.4 */ 1862 T_SWITCH T_LPAREN expression T_RPAREN { 1863 stmt_switch_expr($3); 1864 clear_warning_flags(); 1865 } 1866 ; 1867 1868 iteration_statement: /* C99 6.8.5 */ 1869 while_expr statement { 1870 clear_warning_flags(); 1871 stmt_while_expr_stmt(); 1872 } 1873 | while_expr error { 1874 clear_warning_flags(); 1875 stmt_while_expr_stmt(); 1876 } 1877 | do_statement do_while_expr { 1878 stmt_do_while_expr($2); 1879 seen_fallthrough = false; 1880 } 1881 | do error { 1882 clear_warning_flags(); 1883 stmt_do_while_expr(NULL); 1884 } 1885 | for_exprs statement { 1886 clear_warning_flags(); 1887 stmt_for_exprs_stmt(); 1888 end_declaration_level(); 1889 block_level--; 1890 } 1891 | for_exprs error { 1892 clear_warning_flags(); 1893 stmt_for_exprs_stmt(); 1894 end_declaration_level(); 1895 block_level--; 1896 } 1897 ; 1898 1899 while_expr: /* see C99 6.8.5 */ 1900 T_WHILE T_LPAREN expression T_RPAREN { 1901 stmt_while_expr($3); 1902 clear_warning_flags(); 1903 } 1904 ; 1905 1906 do_statement: /* see C99 6.8.5 */ 1907 do statement { 1908 clear_warning_flags(); 1909 } 1910 ; 1911 1912 do: /* see C99 6.8.5 */ 1913 T_DO { 1914 stmt_do(); 1915 } 1916 ; 1917 1918 do_while_expr: /* see C99 6.8.5 */ 1919 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1920 $$ = $3; 1921 } 1922 ; 1923 1924 for_start: /* see C99 6.8.5 */ 1925 T_FOR T_LPAREN { 1926 begin_declaration_level(DLK_AUTO); 1927 block_level++; 1928 } 1929 ; 1930 1931 for_exprs: /* see C99 6.8.5 */ 1932 for_start 1933 begin_type_declaration_specifiers end_type 1934 notype_init_declarators T_SEMI 1935 expression_opt T_SEMI 1936 expression_opt T_RPAREN { 1937 /* variable declaration in for loop */ 1938 c99ism(325); 1939 stmt_for_exprs(NULL, $6, $8); 1940 clear_warning_flags(); 1941 } 1942 | for_start 1943 expression_opt T_SEMI 1944 expression_opt T_SEMI 1945 expression_opt T_RPAREN { 1946 stmt_for_exprs($2, $4, $6); 1947 clear_warning_flags(); 1948 } 1949 ; 1950 1951 jump_statement: /* C99 6.8.6 */ 1952 goto identifier T_SEMI { 1953 stmt_goto(getsym($2)); 1954 } 1955 | goto error T_SEMI { 1956 set_symtyp(FVFT); 1957 } 1958 | T_CONTINUE T_SEMI { 1959 stmt_continue(); 1960 } 1961 | T_BREAK T_SEMI { 1962 stmt_break(); 1963 } 1964 | T_RETURN sys T_SEMI { 1965 stmt_return($2, NULL); 1966 } 1967 | T_RETURN sys expression T_SEMI { 1968 stmt_return($2, $3); 1969 } 1970 ; 1971 1972 goto: /* see C99 6.8.6 */ 1973 T_GOTO { 1974 set_symtyp(FLABEL); 1975 } 1976 ; 1977 1978 asm_statement: /* GCC extension */ 1979 T_ASM T_LPAREN read_until_rparen T_SEMI { 1980 dcs_set_asm(); 1981 } 1982 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 1983 dcs_set_asm(); 1984 } 1985 | T_ASM error 1986 ; 1987 1988 read_until_rparen: /* helper for 'asm_statement' */ 1989 /* empty */ { 1990 read_until_rparen(); 1991 } 1992 ; 1993 1994 translation_unit: /* C99 6.9 */ 1995 external_declaration 1996 | translation_unit external_declaration 1997 ; 1998 1999 external_declaration: /* C99 6.9 */ 2000 function_definition { 2001 global_clean_up_decl(false); 2002 clear_warning_flags(); 2003 } 2004 | top_level_declaration { 2005 global_clean_up_decl(false); 2006 clear_warning_flags(); 2007 } 2008 | asm_statement /* GCC extension */ 2009 | T_SEMI { /* GCC extension */ 2010 /* 2011 * TODO: Only allow this in GCC mode, not in plain C99. 2012 * This is one of the top 10 warnings in the NetBSD build. 2013 */ 2014 if (!allow_trad && !allow_c99) { 2015 /* empty declaration */ 2016 error(0); 2017 } else if (allow_c90) { 2018 /* empty declaration */ 2019 warning(0); 2020 } 2021 } 2022 ; 2023 2024 /* 2025 * On the top level, lint allows several forms of declarations that it doesn't 2026 * allow in functions. For example, a single ';' is an empty declaration and 2027 * is supported by some compilers, but in a function it would be an empty 2028 * statement, not a declaration. This makes a difference in C90 mode, where 2029 * a statement must not be followed by a declaration. 2030 * 2031 * See 'declaration' for all other declarations. 2032 */ 2033 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2034 begin_type end_type notype_init_declarators T_SEMI { 2035 /* TODO: Make this an error in C99 mode as well. */ 2036 if (!allow_trad && !allow_c99) { 2037 /* old-style declaration; add 'int' */ 2038 error(1); 2039 } else if (allow_c90) { 2040 /* old-style declaration; add 'int' */ 2041 warning(1); 2042 } 2043 } 2044 | declaration 2045 | error T_SEMI { 2046 global_clean_up(); 2047 } 2048 | error T_RBRACE { 2049 global_clean_up(); 2050 } 2051 ; 2052 2053 function_definition: /* C99 6.9.1 */ 2054 func_declarator { 2055 if ($1->s_type->t_tspec != FUNC) { 2056 /* syntax error '%s' */ 2057 error(249, yytext); 2058 YYERROR; 2059 } 2060 if ($1->s_type->t_typedef) { 2061 /* ()-less function definition */ 2062 error(64); 2063 YYERROR; 2064 } 2065 check_extern_declaration($1); 2066 begin_function($1); 2067 block_level++; 2068 begin_declaration_level(DLK_OLD_STYLE_ARGS); 2069 if (lwarn == LWARN_NONE) 2070 $1->s_used = true; 2071 } arg_declaration_list_opt { 2072 end_declaration_level(); 2073 block_level--; 2074 check_func_lint_directives(); 2075 check_func_old_style_arguments(); 2076 begin_control_statement(CS_FUNCTION_BODY); 2077 } compound_statement { 2078 end_function(); 2079 end_control_statement(CS_FUNCTION_BODY); 2080 } 2081 ; 2082 2083 func_declarator: 2084 begin_type end_type notype_declarator { 2085 if (!allow_trad) { 2086 /* old-style declaration; add 'int' */ 2087 error(1); 2088 } 2089 $$ = $3; 2090 } 2091 | begin_type_declmods end_type notype_declarator { 2092 if (!allow_trad) { 2093 /* old-style declaration; add 'int' */ 2094 error(1); 2095 } 2096 $$ = $3; 2097 } 2098 | begin_type_declaration_specifiers end_type type_declarator { 2099 $$ = $3; 2100 } 2101 ; 2102 2103 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2104 /* empty */ 2105 | arg_declaration_list 2106 ; 2107 2108 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2109 arg_declaration 2110 | arg_declaration_list arg_declaration 2111 /* XXX or better "arg_declaration error" ? */ 2112 | error 2113 ; 2114 2115 /* 2116 * "arg_declaration" is separated from "declaration" because it 2117 * needs other error handling. 2118 */ 2119 arg_declaration: 2120 begin_type_declmods end_type T_SEMI { 2121 /* empty declaration */ 2122 warning(2); 2123 } 2124 | begin_type_declmods end_type notype_init_declarators T_SEMI 2125 | begin_type_declaration_specifiers end_type T_SEMI { 2126 if (!dcs->d_nonempty_decl) { 2127 /* empty declaration */ 2128 warning(2); 2129 } else { 2130 /* '%s' declared in argument declaration list */ 2131 warning(3, type_name(dcs->d_type)); 2132 } 2133 } 2134 | begin_type_declaration_specifiers end_type 2135 type_init_declarators T_SEMI { 2136 if (dcs->d_nonempty_decl) { 2137 /* '%s' declared in argument declaration list */ 2138 warning(3, type_name(dcs->d_type)); 2139 } 2140 } 2141 | begin_type_declmods error 2142 | begin_type_declaration_specifiers error 2143 ; 2144 2145 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2146 gcc_attribute_specifier_list_opt: 2147 /* empty */ 2148 | gcc_attribute_specifier_list 2149 ; 2150 2151 gcc_attribute_specifier_list: 2152 gcc_attribute_specifier 2153 | gcc_attribute_specifier_list gcc_attribute_specifier 2154 ; 2155 2156 gcc_attribute_specifier: 2157 T_ATTRIBUTE T_LPAREN T_LPAREN { 2158 in_gcc_attribute = true; 2159 } gcc_attribute_list { 2160 in_gcc_attribute = false; 2161 } T_RPAREN T_RPAREN 2162 ; 2163 2164 gcc_attribute_list: 2165 gcc_attribute 2166 | gcc_attribute_list T_COMMA gcc_attribute 2167 ; 2168 2169 gcc_attribute: 2170 /* empty */ 2171 | T_NAME { 2172 const char *name = $1->sb_name; 2173 if (is_either(name, "packed", "__packed__")) 2174 dcs_add_packed(); 2175 else if (is_either(name, "used", "__used__") || 2176 is_either(name, "unused", "__unused__")) 2177 dcs_set_used(); 2178 else if (is_either(name, "fallthrough", "__fallthrough__")) 2179 fallthru(1); 2180 } 2181 | T_NAME T_LPAREN T_RPAREN 2182 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2183 | type_qualifier { 2184 if ($1 != CONST) 2185 yyerror("Bad attribute"); 2186 } 2187 ; 2188 2189 gcc_attribute_parameters: 2190 constant_expr 2191 | gcc_attribute_parameters T_COMMA constant_expr 2192 ; 2193 2194 sys: 2195 /* empty */ { 2196 $$ = in_system_header; 2197 } 2198 ; 2199 2200 %% 2201 2202 /* ARGSUSED */ 2203 int 2204 yyerror(const char *msg) 2205 { 2206 /* syntax error '%s' */ 2207 error(249, yytext); 2208 if (++sytxerr >= 5) 2209 norecover(); 2210 return 0; 2211 } 2212 2213 #if YYDEBUG && YYBYACC 2214 static const char * 2215 cgram_to_string(int token, YYSTYPE val) 2216 { 2217 2218 switch (token) { 2219 case T_INCDEC: 2220 case T_MULTIPLICATIVE: 2221 case T_ADDITIVE: 2222 case T_SHIFT: 2223 case T_RELATIONAL: 2224 case T_EQUALITY: 2225 case T_OPASSIGN: 2226 return modtab[val.y_op].m_name; 2227 case T_SCLASS: 2228 return scl_name(val.y_scl); 2229 case T_TYPE: 2230 case T_STRUCT_OR_UNION: 2231 return tspec_name(val.y_tspec); 2232 case T_QUAL: 2233 return tqual_name(val.y_tqual); 2234 case T_NAME: 2235 return val.y_name->sb_name; 2236 default: 2237 return "<none>"; 2238 } 2239 } 2240 #endif 2241 2242 static void 2243 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2244 { 2245 declare(decl, has_initializer, renaming); 2246 if (renaming != NULL) 2247 freeyyv(&renaming, T_NAME); 2248 } 2249 2250 /* 2251 * Discard all input tokens up to and including the next 2252 * unmatched right paren 2253 */ 2254 static void 2255 read_until_rparen(void) 2256 { 2257 int level; 2258 2259 if (yychar < 0) 2260 yychar = yylex(); 2261 freeyyv(&yylval, yychar); 2262 2263 level = 1; 2264 while (yychar > 0) { 2265 if (yychar == T_LPAREN) 2266 level++; 2267 if (yychar == T_RPAREN && --level == 0) 2268 break; 2269 freeyyv(&yylval, yychar = yylex()); 2270 } 2271 2272 yyclearin; 2273 } 2274 2275 static sym_t * 2276 symbolrename(sym_t *s, sbuf_t *sb) 2277 { 2278 if (sb != NULL) 2279 s->s_rename = sb->sb_name; 2280 return s; 2281 } 2282
Indexes created Fri Oct 03 02:09:57 GMT 2025