cgram.y revision 1.457
1 %{ 2 /* $NetBSD: cgram.y,v 1.457 2023/07/12 18:26:04 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 1.457 2023/07/12 18:26:04 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 tqual_t y_tqual; 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($$)); } <y_tspec> 169 %printer { fprintf(yyo, "%s", tqual_name($$)); } <y_tqual> 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%s%s", 185 $$->p_const ? "const " : "", 186 $$->p_volatile ? "volatile " : "", 187 $$->p_pointer ? "*" : ""); 188 } <y_qual_ptr> 189 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 190 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 191 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 192 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 193 */ 194 195 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 196 %token T_POINT T_ARROW 197 %token T_COMPLEMENT T_LOGNOT 198 %token <y_op> T_INCDEC 199 %token T_SIZEOF 200 %token T_BUILTIN_OFFSETOF 201 %token T_TYPEOF 202 %token T_EXTENSION 203 %token T_ALIGNAS 204 %token T_ALIGNOF 205 %token T_ASTERISK 206 %token <y_op> T_MULTIPLICATIVE 207 %token <y_op> T_ADDITIVE 208 %token <y_op> T_SHIFT 209 %token <y_op> T_RELATIONAL 210 %token <y_op> T_EQUALITY 211 %token T_AMPER 212 %token T_BITXOR 213 %token T_BITOR 214 %token T_LOGAND 215 %token T_LOGOR 216 %token T_QUEST 217 %token T_COLON 218 %token T_ASSIGN 219 %token <y_op> T_OPASSIGN 220 %token T_COMMA 221 %token T_SEMI 222 %token T_ELLIPSIS 223 %token T_REAL 224 %token T_IMAG 225 %token T_GENERIC 226 227 /* storage classes (extern, static, auto, register and typedef) */ 228 %token <y_scl> T_SCLASS 229 %token <y_function_specifier> T_FUNCTION_SPECIFIER 230 231 /* 232 * predefined type keywords (char, int, short, long, unsigned, signed, 233 * float, double, void); see T_TYPENAME for types from typedef 234 */ 235 %token <y_tspec> T_TYPE 236 237 /* qualifiers (const, volatile, restrict, _Thread_local) */ 238 %token <y_tqual> T_QUAL 239 %token <y_tqual> T_ATOMIC 240 241 /* struct or union */ 242 %token <y_tspec> T_STRUCT_OR_UNION 243 244 /* remaining keywords */ 245 %token T_ASM 246 %token T_BREAK 247 %token T_CASE 248 %token T_CONTINUE 249 %token T_DEFAULT 250 %token T_DO 251 %token T_ELSE 252 %token T_ENUM 253 %token T_FOR 254 %token T_GOTO 255 %token T_IF 256 %token T_PACKED 257 %token T_RETURN 258 %token T_SWITCH 259 %token T_SYMBOLRENAME 260 %token T_WHILE 261 %token T_STATIC_ASSERT 262 263 %token T_ATTRIBUTE 264 265 %left T_THEN 266 %left T_ELSE 267 %right T_QUEST T_COLON 268 %left T_LOGOR 269 %left T_LOGAND 270 %left T_BITOR 271 %left T_BITXOR 272 %left T_AMPER 273 %left T_EQUALITY 274 %left T_RELATIONAL 275 %left T_SHIFT 276 %left T_ADDITIVE 277 %left T_ASTERISK T_MULTIPLICATIVE 278 279 %token <y_name> T_NAME 280 %token <y_name> T_TYPENAME 281 %token <y_val> T_CON 282 %token <y_string> T_STRING 283 284 /* No type for program. */ 285 %type <y_sym> identifier_sym 286 %type <y_name> identifier 287 %type <y_string> string 288 %type <y_tnode> primary_expression 289 %type <y_tnode> generic_selection 290 %type <y_generic> generic_assoc_list 291 %type <y_generic> generic_association 292 %type <y_tnode> postfix_expression 293 /* No type for comma_opt. */ 294 %type <y_tnode> gcc_statement_expr_list 295 %type <y_tnode> gcc_statement_expr_item 296 %type <y_op> point_or_arrow 297 %type <y_tnode> argument_expression_list 298 %type <y_tnode> unary_expression 299 %type <y_tnode> cast_expression 300 %type <y_tnode> expression_opt 301 %type <y_tnode> conditional_expression 302 %type <y_tnode> assignment_expression 303 %type <y_tnode> expression 304 %type <y_tnode> constant_expression 305 /* No type for declaration_or_error. */ 306 /* No type for declaration. */ 307 /* No type for begin_type_declaration_specifiers. */ 308 /* No type for begin_type_declmods. */ 309 /* No type for begin_type_specifier_qualifier_list. */ 310 /* No type for begin_type_specifier_qualifier_list_postfix. */ 311 %type <y_type> begin_type_typespec 312 /* No type for begin_type_qualifier_list. */ 313 /* No type for declmod. */ 314 /* No type for type_attribute_list_opt. */ 315 /* No type for type_attribute_list. */ 316 /* No type for type_attribute_opt. */ 317 /* No type for type_attribute. */ 318 /* No type for begin_type. */ 319 /* No type for end_type. */ 320 %type <y_type> type_specifier 321 %type <y_type> notype_type_specifier 322 %type <y_type> atomic_type_specifier 323 %type <y_type> struct_or_union_specifier 324 %type <y_tspec> struct_or_union 325 %type <y_sym> braced_member_declaration_list 326 /* No type for member_declaration_lbrace. */ 327 %type <y_sym> member_declaration_list_with_rbrace 328 %type <y_sym> member_declaration_list 329 %type <y_sym> member_declaration 330 %type <y_sym> notype_member_declarators 331 %type <y_sym> type_member_declarators 332 %type <y_sym> notype_member_declarator 333 %type <y_sym> type_member_declarator 334 %type <y_type> enum_specifier 335 /* No type for enum. */ 336 %type <y_sym> enum_declaration 337 /* No type for enum_decl_lbrace. */ 338 %type <y_sym> enums_with_opt_comma 339 %type <y_sym> enumerator_list 340 %type <y_sym> enumerator 341 %type <y_tqual> type_qualifier 342 /* No type for atomic. */ 343 %type <y_qual_ptr> pointer 344 %type <y_qual_ptr> asterisk 345 %type <y_qual_ptr> type_qualifier_list_opt 346 %type <y_qual_ptr> type_qualifier_list 347 %type <y_qual_ptr> type_qualifier_list_elem 348 /* No type for notype_init_declarators. */ 349 /* No type for type_init_declarators. */ 350 /* No type for notype_init_declarator. */ 351 /* No type for type_init_declarator. */ 352 %type <y_sym> notype_declarator 353 %type <y_sym> type_declarator 354 %type <y_sym> notype_direct_declarator 355 %type <y_sym> type_direct_declarator 356 %type <y_sym> type_param_declarator 357 %type <y_sym> notype_param_declarator 358 %type <y_sym> direct_param_declarator 359 %type <y_sym> direct_notype_param_declarator 360 %type <y_sym> param_list 361 /* No type for id_list_lparen. */ 362 /* No type for abstract_decl_lparen. */ 363 %type <y_array_size> array_size_opt 364 %type <y_tnode> array_size 365 %type <y_sym> identifier_list 366 %type <y_type> type_name 367 %type <y_sym> abstract_declaration 368 %type <y_sym> abstract_declarator 369 %type <y_sym> direct_abstract_declarator 370 %type <y_sym> abstract_decl_param_list 371 /* No type for abstract_decl_lparen. */ 372 %type <y_sym> vararg_parameter_type_list 373 %type <y_sym> parameter_type_list 374 %type <y_sym> parameter_declaration 375 /* No type for braced_initializer. */ 376 /* No type for initializer. */ 377 /* No type for initializer_list. */ 378 /* No type for initializer_list_item. */ 379 /* No type for designation. */ 380 /* No type for begin_designation. */ 381 /* No type for designator_list. */ 382 /* No type for designator. */ 383 /* No type for static_assert_declaration. */ 384 %type <y_range> range 385 /* No type for init_lbrace. */ 386 /* No type for init_rbrace. */ 387 %type <y_name> asm_or_symbolrename_opt 388 /* No type for statement. */ 389 /* No type for non_expr_statement. */ 390 /* No type for labeled_statement. */ 391 /* No type for label. */ 392 /* No type for compound_statement. */ 393 /* No type for compound_statement_lbrace. */ 394 /* No type for compound_statement_rbrace. */ 395 %type <y_seen_statement> block_item_list 396 %type <y_seen_statement> block_item 397 /* No type for expression_statement. */ 398 /* No type for selection_statement. */ 399 /* No type for if_without_else. */ 400 /* No type for if_expr. */ 401 /* No type for switch_expr. */ 402 /* No type for iteration_statement. */ 403 /* No type for while_expr. */ 404 /* No type for do_statement. */ 405 /* No type for do. */ 406 %type <y_tnode> do_while_expr 407 /* No type for for_start. */ 408 /* No type for for_exprs. */ 409 /* No type for jump_statement. */ 410 /* No type for goto. */ 411 /* No type for asm_statement. */ 412 /* No type for read_until_rparen. */ 413 /* No type for translation_unit. */ 414 /* No type for external_declaration. */ 415 /* No type for top_level_declaration. */ 416 /* No type for function_definition. */ 417 %type <y_sym> func_declarator 418 /* No type for arg_declaration_list_opt. */ 419 /* No type for arg_declaration_list. */ 420 /* No type for arg_declaration. */ 421 /* No type for gcc_attribute_specifier_list_opt. */ 422 /* No type for gcc_attribute_specifier_list. */ 423 /* No type for gcc_attribute_specifier. */ 424 /* No type for gcc_attribute_list. */ 425 /* No type for gcc_attribute. */ 426 /* No type for gcc_attribute_parameters. */ 427 %type <y_in_system_header> sys 428 429 %% 430 431 program: 432 /* empty */ { 433 /* TODO: Make this an error in C99 mode as well. */ 434 if (!allow_trad && !allow_c99) { 435 /* empty translation unit */ 436 error(272); 437 } else if (allow_c90) { 438 /* empty translation unit */ 439 warning(272); 440 } 441 } 442 | translation_unit 443 ; 444 445 identifier_sym: /* helper for struct/union/enum */ 446 identifier { 447 $$ = getsym($1); 448 } 449 ; 450 451 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 452 identifier: 453 T_NAME { 454 debug_step("cgram: name '%s'", $1->sb_name); 455 $$ = $1; 456 } 457 | T_TYPENAME { 458 debug_step("cgram: typename '%s'", $1->sb_name); 459 $$ = $1; 460 } 461 ; 462 463 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 464 string: 465 T_STRING 466 | string T_STRING { 467 if (!allow_c90) { 468 /* concatenated strings are illegal in traditional C */ 469 warning(219); 470 } 471 $$ = cat_strings($1, $2); 472 } 473 ; 474 475 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 476 primary_expression: 477 T_NAME { 478 bool sys_name, sys_next; 479 sys_name = in_system_header; 480 if (yychar < 0) 481 yychar = yylex(); 482 sys_next = in_system_header; 483 in_system_header = sys_name; 484 $$ = build_name(getsym($1), yychar == T_LPAREN); 485 in_system_header = sys_next; 486 } 487 | T_CON { 488 $$ = build_constant(gettyp($1->v_tspec), $1); 489 } 490 | string { 491 $$ = build_string($1); 492 } 493 | T_LPAREN expression T_RPAREN { 494 if ($2 != NULL) 495 $2->tn_parenthesized = true; 496 $$ = $2; 497 } 498 | generic_selection 499 /* GCC primary-expression, see c_parser_postfix_expression */ 500 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 501 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 502 set_symtyp(FMEMBER); 503 $$ = build_offsetof($3, getsym($5)); 504 } 505 ; 506 507 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 508 generic_selection: 509 T_GENERIC T_LPAREN assignment_expression T_COMMA 510 generic_assoc_list T_RPAREN { 511 /* generic selection requires C11 or later */ 512 c11ism(345); 513 $$ = build_generic_selection($3, $5); 514 } 515 ; 516 517 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 518 generic_assoc_list: 519 generic_association 520 | generic_assoc_list T_COMMA generic_association { 521 $3->ga_prev = $1; 522 $$ = $3; 523 } 524 ; 525 526 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 527 generic_association: 528 type_name T_COLON assignment_expression { 529 $$ = block_zero_alloc(sizeof(*$$)); 530 $$->ga_arg = $1; 531 $$->ga_result = $3; 532 } 533 | T_DEFAULT T_COLON assignment_expression { 534 $$ = block_zero_alloc(sizeof(*$$)); 535 $$->ga_arg = NULL; 536 $$->ga_result = $3; 537 } 538 ; 539 540 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 541 postfix_expression: 542 primary_expression 543 | postfix_expression T_LBRACK sys expression T_RBRACK { 544 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 545 } 546 | postfix_expression T_LPAREN sys T_RPAREN { 547 $$ = build_function_call($1, $3, NULL); 548 } 549 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 550 $$ = build_function_call($1, $3, $4); 551 } 552 | postfix_expression point_or_arrow sys T_NAME { 553 $$ = build_member_access($1, $2, $3, $4); 554 } 555 | postfix_expression T_INCDEC sys { 556 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 557 } 558 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 559 sym_t *tmp = mktempsym($2); 560 begin_initialization(tmp); 561 cgram_declare(tmp, true, NULL); 562 } braced_initializer { 563 if (!allow_c99) 564 /* compound literals are a C99/GCC extension */ 565 gnuism(319); 566 $$ = build_name(current_initsym(), false); 567 end_initialization(); 568 } 569 | T_LPAREN compound_statement_lbrace { 570 begin_statement_expr(); 571 } gcc_statement_expr_list { 572 do_statement_expr($4); 573 } compound_statement_rbrace T_RPAREN { 574 $$ = end_statement_expr(); 575 } 576 ; 577 578 comma_opt: /* helper for 'postfix_expression' */ 579 /* empty */ 580 | T_COMMA 581 ; 582 583 /* 584 * The inner part of a GCC statement-expression of the form ({ ... }). 585 * 586 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 587 */ 588 gcc_statement_expr_list: 589 gcc_statement_expr_item 590 | gcc_statement_expr_list gcc_statement_expr_item { 591 $$ = $2; 592 } 593 ; 594 595 gcc_statement_expr_item: 596 declaration_or_error { 597 clear_warning_flags(); 598 $$ = NULL; 599 } 600 | non_expr_statement { 601 $$ = expr_alloc_tnode(); 602 $$->tn_type = gettyp(VOID); 603 } 604 | T_SEMI { 605 $$ = expr_alloc_tnode(); 606 $$->tn_type = gettyp(VOID); 607 } 608 | expression T_SEMI { 609 if ($1 == NULL) { /* in case of syntax errors */ 610 $$ = expr_alloc_tnode(); 611 $$->tn_type = gettyp(VOID); 612 } else { 613 /* XXX: do that only on the last name */ 614 if ($1->tn_op == NAME) 615 $1->tn_sym->s_used = true; 616 expr($1, false, false, false, false); 617 seen_fallthrough = false; 618 $$ = $1; 619 } 620 } 621 ; 622 623 point_or_arrow: /* helper for 'postfix_expression' */ 624 T_POINT { 625 set_symtyp(FMEMBER); 626 $$ = POINT; 627 } 628 | T_ARROW { 629 set_symtyp(FMEMBER); 630 $$ = ARROW; 631 } 632 ; 633 634 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 635 argument_expression_list: 636 assignment_expression { 637 $$ = build_function_argument(NULL, $1); 638 } 639 | argument_expression_list T_COMMA assignment_expression { 640 $$ = build_function_argument($1, $3); 641 } 642 ; 643 644 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 645 unary_expression: 646 postfix_expression 647 | T_INCDEC sys unary_expression { 648 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 649 } 650 | T_AMPER sys cast_expression { 651 $$ = build_unary(ADDR, $2, $3); 652 } 653 | T_ASTERISK sys cast_expression { 654 $$ = build_unary(INDIR, $2, $3); 655 } 656 | T_ADDITIVE sys cast_expression { 657 if (!allow_c90 && $1 == PLUS) { 658 /* unary '+' is illegal in traditional C */ 659 warning(100); 660 } 661 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 662 } 663 | T_COMPLEMENT sys cast_expression { 664 $$ = build_unary(COMPL, $2, $3); 665 } 666 | T_LOGNOT sys cast_expression { 667 $$ = build_unary(NOT, $2, $3); 668 } 669 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 670 $$ = build_unary(REAL, $2, $3); 671 } 672 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 673 $$ = build_unary(IMAG, $2, $3); 674 } 675 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 676 $$ = $2; 677 } 678 | T_SIZEOF unary_expression { 679 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 680 if ($$ != NULL) 681 check_expr_misc($2, 682 false, false, false, false, false, true); 683 } 684 | T_SIZEOF T_LPAREN type_name T_RPAREN { 685 $$ = build_sizeof($3); 686 } 687 | T_ALIGNOF unary_expression { 688 /* non type argument to alignof is a GCC extension */ 689 gnuism(349); 690 lint_assert($2 != NULL); 691 $$ = build_alignof($2->tn_type); 692 } 693 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 694 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 695 /* TODO: c11ism */ 696 $$ = build_alignof($3); 697 } 698 ; 699 700 /* The rule 'unary_operator' is inlined into unary_expression. */ 701 702 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 703 cast_expression: 704 unary_expression 705 | T_LPAREN type_name T_RPAREN cast_expression { 706 $$ = cast($4, $2); 707 } 708 ; 709 710 expression_opt: 711 /* empty */ { 712 $$ = NULL; 713 } 714 | expression 715 ; 716 717 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 718 /* 'conditional_expression' also implements 'additive_expression'. */ 719 /* 'conditional_expression' also implements 'shift_expression'. */ 720 /* 'conditional_expression' also implements 'relational_expression'. */ 721 /* 'conditional_expression' also implements 'equality_expression'. */ 722 /* 'conditional_expression' also implements 'AND_expression'. */ 723 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 724 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 725 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 726 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 727 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 728 conditional_expression: 729 cast_expression 730 | conditional_expression T_ASTERISK sys conditional_expression { 731 $$ = build_binary($1, MULT, $3, $4); 732 } 733 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 734 $$ = build_binary($1, $2, $3, $4); 735 } 736 | conditional_expression T_ADDITIVE sys conditional_expression { 737 $$ = build_binary($1, $2, $3, $4); 738 } 739 | conditional_expression T_SHIFT sys conditional_expression { 740 $$ = build_binary($1, $2, $3, $4); 741 } 742 | conditional_expression T_RELATIONAL sys conditional_expression { 743 $$ = build_binary($1, $2, $3, $4); 744 } 745 | conditional_expression T_EQUALITY sys conditional_expression { 746 $$ = build_binary($1, $2, $3, $4); 747 } 748 | conditional_expression T_AMPER sys conditional_expression { 749 $$ = build_binary($1, BITAND, $3, $4); 750 } 751 | conditional_expression T_BITXOR sys conditional_expression { 752 $$ = build_binary($1, BITXOR, $3, $4); 753 } 754 | conditional_expression T_BITOR sys conditional_expression { 755 $$ = build_binary($1, BITOR, $3, $4); 756 } 757 | conditional_expression T_LOGAND sys conditional_expression { 758 $$ = build_binary($1, LOGAND, $3, $4); 759 } 760 | conditional_expression T_LOGOR sys conditional_expression { 761 $$ = build_binary($1, LOGOR, $3, $4); 762 } 763 | conditional_expression T_QUEST sys 764 expression T_COLON sys conditional_expression { 765 $$ = build_binary($1, QUEST, $3, 766 build_binary($4, COLON, $6, $7)); 767 } 768 ; 769 770 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 771 assignment_expression: 772 conditional_expression 773 | unary_expression T_ASSIGN sys assignment_expression { 774 $$ = build_binary($1, ASSIGN, $3, $4); 775 } 776 | unary_expression T_OPASSIGN sys assignment_expression { 777 $$ = build_binary($1, $2, $3, $4); 778 } 779 ; 780 781 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 782 expression: 783 assignment_expression 784 | expression T_COMMA sys assignment_expression { 785 $$ = build_binary($1, COMMA, $3, $4); 786 } 787 ; 788 789 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 790 constant_expression: 791 conditional_expression 792 ; 793 794 declaration_or_error: 795 declaration 796 | error T_SEMI 797 ; 798 799 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 800 declaration: 801 begin_type_declmods end_type T_SEMI { 802 if (dcs->d_scl == TYPEDEF) { 803 /* typedef declares no type name */ 804 warning(72); 805 } else { 806 /* empty declaration */ 807 warning(2); 808 } 809 } 810 | begin_type_declmods end_type notype_init_declarators T_SEMI { 811 if (dcs->d_scl == TYPEDEF) { 812 /* syntax error '%s' */ 813 error(249, "missing base type for typedef"); 814 } else { 815 /* old-style declaration; add 'int' */ 816 error(1); 817 } 818 } 819 | begin_type_declaration_specifiers end_type T_SEMI { 820 if (dcs->d_scl == TYPEDEF) { 821 /* typedef declares no type name */ 822 warning(72); 823 } else if (!dcs->d_nonempty_decl) { 824 /* empty declaration */ 825 warning(2); 826 } 827 } 828 | begin_type_declaration_specifiers end_type 829 type_init_declarators T_SEMI 830 | static_assert_declaration 831 ; 832 833 begin_type_declaration_specifiers: /* see C99 6.7 */ 834 begin_type_typespec { 835 dcs_add_type($1); 836 } 837 | begin_type_declmods type_specifier { 838 dcs_add_type($2); 839 } 840 | type_attribute begin_type_declaration_specifiers 841 | begin_type_declaration_specifiers declmod 842 | begin_type_declaration_specifiers notype_type_specifier { 843 dcs_add_type($2); 844 } 845 ; 846 847 begin_type_declmods: /* see C99 6.7 */ 848 begin_type type_qualifier { 849 dcs_add_qualifier($2); 850 } 851 | begin_type T_SCLASS { 852 dcs_add_storage_class($2); 853 } 854 | begin_type T_FUNCTION_SPECIFIER { 855 dcs_add_function_specifier($2); 856 } 857 | begin_type_declmods declmod 858 ; 859 860 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 861 begin_type_specifier_qualifier_list_postfix 862 | type_attribute_list begin_type_specifier_qualifier_list_postfix 863 ; 864 865 begin_type_specifier_qualifier_list_postfix: 866 begin_type_typespec { 867 dcs_add_type($1); 868 } 869 | begin_type_qualifier_list type_specifier { 870 dcs_add_type($2); 871 } 872 | begin_type_specifier_qualifier_list_postfix type_qualifier { 873 dcs_add_qualifier($2); 874 } 875 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 876 dcs_add_type($2); 877 } 878 | begin_type_specifier_qualifier_list_postfix type_attribute 879 ; 880 881 begin_type_typespec: 882 begin_type notype_type_specifier { 883 $$ = $2; 884 } 885 | begin_type T_TYPENAME { 886 $$ = getsym($2)->s_type; 887 } 888 ; 889 890 begin_type_qualifier_list: 891 begin_type type_qualifier { 892 dcs_add_qualifier($2); 893 } 894 | begin_type_qualifier_list type_qualifier { 895 dcs_add_qualifier($2); 896 } 897 ; 898 899 declmod: 900 type_qualifier { 901 dcs_add_qualifier($1); 902 } 903 | T_SCLASS { 904 dcs_add_storage_class($1); 905 } 906 | T_FUNCTION_SPECIFIER { 907 dcs_add_function_specifier($1); 908 } 909 | type_attribute_list 910 ; 911 912 type_attribute_list_opt: 913 /* empty */ 914 | type_attribute_list 915 ; 916 917 type_attribute_list: 918 type_attribute 919 | type_attribute_list type_attribute 920 ; 921 922 type_attribute_opt: 923 /* empty */ 924 | type_attribute 925 ; 926 927 type_attribute: /* See C11 6.7 declaration-specifiers */ 928 gcc_attribute_specifier 929 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 930 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 931 | T_PACKED { 932 dcs_add_packed(); 933 } 934 ; 935 936 begin_type: 937 /* empty */ { 938 dcs_begin_type(); 939 } 940 ; 941 942 end_type: 943 /* empty */ { 944 dcs_end_type(); 945 } 946 ; 947 948 type_specifier: /* C99 6.7.2 */ 949 notype_type_specifier 950 | T_TYPENAME { 951 $$ = getsym($1)->s_type; 952 } 953 ; 954 955 notype_type_specifier: /* see C99 6.7.2 */ 956 T_TYPE { 957 $$ = gettyp($1); 958 } 959 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 960 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 961 $$->t_typeof = true; 962 } 963 | atomic_type_specifier 964 | struct_or_union_specifier { 965 end_declaration_level(); 966 $$ = $1; 967 } 968 | enum_specifier { 969 end_declaration_level(); 970 $$ = $1; 971 } 972 ; 973 974 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 975 atomic_type_specifier: 976 atomic T_LPAREN type_name T_RPAREN { 977 $$ = $3; 978 } 979 ; 980 981 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 982 struct_or_union_specifier: 983 struct_or_union identifier_sym { 984 /* 985 * STDC requires that "struct a;" always introduces 986 * a new tag if "a" is not declared at current level 987 * 988 * yychar is valid because otherwise the parser would not 989 * have been able to decide if it must shift or reduce 990 */ 991 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 992 } 993 | struct_or_union identifier_sym { 994 dcs->d_tag_type = make_tag_type($2, $1, true, false); 995 } braced_member_declaration_list { 996 $$ = complete_struct_or_union($4); 997 } 998 | struct_or_union { 999 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1000 } braced_member_declaration_list { 1001 $$ = complete_struct_or_union($3); 1002 } 1003 | struct_or_union error { 1004 set_symtyp(FVFT); 1005 $$ = gettyp(INT); 1006 } 1007 ; 1008 1009 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1010 struct_or_union: 1011 T_STRUCT_OR_UNION { 1012 set_symtyp(FTAG); 1013 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1014 dcs->d_sou_size_in_bits = 0; 1015 dcs->d_sou_align_in_bits = CHAR_SIZE; 1016 $$ = $1; 1017 } 1018 | struct_or_union type_attribute 1019 ; 1020 1021 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1022 member_declaration_lbrace member_declaration_list_with_rbrace { 1023 $$ = $2; 1024 } 1025 ; 1026 1027 member_declaration_lbrace: /* see C99 6.7.2.1 */ 1028 T_LBRACE { 1029 set_symtyp(FVFT); 1030 } 1031 ; 1032 1033 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1034 member_declaration_list T_RBRACE 1035 | T_RBRACE { 1036 /* XXX: This is not allowed by any C standard. */ 1037 $$ = NULL; 1038 } 1039 ; 1040 1041 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1042 /* Was named struct_declaration_list until C11. */ 1043 member_declaration_list: 1044 member_declaration 1045 | member_declaration_list member_declaration { 1046 $$ = concat_symbols($1, $2); 1047 } 1048 ; 1049 1050 /* Was named struct_declaration until C11. */ 1051 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1052 member_declaration: 1053 begin_type_qualifier_list end_type { 1054 /* ^^ There is no check for the missing type-specifier. */ 1055 /* too late, i know, but getsym() compensates it */ 1056 set_symtyp(FMEMBER); 1057 } notype_member_declarators type_attribute_opt T_SEMI { 1058 set_symtyp(FVFT); 1059 $$ = $4; 1060 } 1061 | begin_type_specifier_qualifier_list end_type { 1062 set_symtyp(FMEMBER); 1063 } type_member_declarators type_attribute_opt T_SEMI { 1064 set_symtyp(FVFT); 1065 $$ = $4; 1066 } 1067 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1068 /* syntax error '%s' */ 1069 error(249, "member without type"); 1070 $$ = NULL; 1071 } 1072 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1073 T_SEMI { 1074 set_symtyp(FVFT); 1075 if (!allow_c11 && !allow_gcc) 1076 /* anonymous struct/union members is a C11 feature */ 1077 warning(49); 1078 if (is_struct_or_union(dcs->d_type->t_tspec)) 1079 $$ = declare_unnamed_member(); 1080 else { 1081 /* syntax error '%s' */ 1082 error(249, "unnamed member"); 1083 $$ = NULL; 1084 } 1085 } 1086 | static_assert_declaration { 1087 $$ = NULL; 1088 } 1089 | error T_SEMI { 1090 set_symtyp(FVFT); 1091 $$ = NULL; 1092 } 1093 ; 1094 1095 /* Was named struct_declarators until C11. */ 1096 notype_member_declarators: 1097 notype_member_declarator { 1098 $$ = declare_member($1); 1099 } 1100 | notype_member_declarators { 1101 set_symtyp(FMEMBER); 1102 } T_COMMA type_member_declarator { 1103 $$ = concat_symbols($1, declare_member($4)); 1104 } 1105 ; 1106 1107 /* Was named struct_declarators until C11. */ 1108 type_member_declarators: 1109 type_member_declarator { 1110 $$ = declare_member($1); 1111 } 1112 | type_member_declarators { 1113 set_symtyp(FMEMBER); 1114 } T_COMMA type_member_declarator { 1115 $$ = concat_symbols($1, declare_member($4)); 1116 } 1117 ; 1118 1119 /* Was named struct_declarator until C11. */ 1120 notype_member_declarator: 1121 notype_declarator 1122 /* C99 6.7.2.1 */ 1123 | notype_declarator T_COLON constant_expression { 1124 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1125 } 1126 /* C99 6.7.2.1 */ 1127 | { 1128 set_symtyp(FVFT); 1129 } T_COLON constant_expression { 1130 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1131 } 1132 ; 1133 1134 /* Was named struct_declarator until C11. */ 1135 type_member_declarator: 1136 type_declarator 1137 | type_declarator T_COLON constant_expression { 1138 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1139 } 1140 | { 1141 set_symtyp(FVFT); 1142 } T_COLON constant_expression { 1143 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1144 } 1145 ; 1146 1147 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1148 enum_specifier: 1149 enum gcc_attribute_specifier_list_opt identifier_sym { 1150 $$ = make_tag_type($3, ENUM, false, false); 1151 } 1152 | enum gcc_attribute_specifier_list_opt identifier_sym { 1153 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1154 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1155 $$ = complete_enum($5); 1156 } 1157 | enum gcc_attribute_specifier_list_opt { 1158 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1159 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1160 $$ = complete_enum($4); 1161 } 1162 | enum error { 1163 set_symtyp(FVFT); 1164 $$ = gettyp(INT); 1165 } 1166 ; 1167 1168 enum: /* helper for C99 6.7.2.2 */ 1169 T_ENUM { 1170 set_symtyp(FTAG); 1171 begin_declaration_level(DLK_ENUM); 1172 } 1173 ; 1174 1175 enum_declaration: /* helper for C99 6.7.2.2 */ 1176 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1177 $$ = $2; 1178 } 1179 ; 1180 1181 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1182 T_LBRACE { 1183 set_symtyp(FVFT); 1184 enumval = 0; 1185 } 1186 ; 1187 1188 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1189 enumerator_list 1190 | enumerator_list T_COMMA { 1191 if (!allow_c99 && !allow_trad) { 1192 /* trailing ',' in enum declaration requires C99 ... */ 1193 error(54); 1194 } else { 1195 /* trailing ',' in enum declaration requires C99 ... */ 1196 c99ism(54); 1197 } 1198 $$ = $1; 1199 } 1200 ; 1201 1202 enumerator_list: /* C99 6.7.2.2 */ 1203 enumerator 1204 | enumerator_list T_COMMA enumerator { 1205 $$ = concat_symbols($1, $3); 1206 } 1207 | error { 1208 $$ = NULL; 1209 } 1210 ; 1211 1212 enumerator: /* C99 6.7.2.2 */ 1213 identifier_sym gcc_attribute_specifier_list_opt { 1214 $$ = enumeration_constant($1, enumval, true); 1215 } 1216 | identifier_sym gcc_attribute_specifier_list_opt 1217 T_ASSIGN constant_expression { 1218 $$ = enumeration_constant($1, to_int_constant($4, true), 1219 false); 1220 } 1221 ; 1222 1223 type_qualifier: /* C99 6.7.3 */ 1224 T_QUAL 1225 | atomic { 1226 $$ = ATOMIC; 1227 } 1228 ; 1229 1230 atomic: /* helper */ 1231 T_ATOMIC { 1232 /* TODO: First fix c11ism, then use it here. */ 1233 if (!allow_c11) 1234 /* '_Atomic' requires C11 or later */ 1235 error(350); 1236 } 1237 ; 1238 1239 pointer: /* C99 6.7.5 */ 1240 asterisk type_qualifier_list_opt { 1241 $$ = merge_qualified_pointer($1, $2); 1242 } 1243 | asterisk type_qualifier_list_opt pointer { 1244 $$ = merge_qualified_pointer($1, $2); 1245 $$ = merge_qualified_pointer($$, $3); 1246 } 1247 ; 1248 1249 asterisk: /* helper for 'pointer' */ 1250 T_ASTERISK { 1251 $$ = xcalloc(1, sizeof(*$$)); 1252 $$->p_pointer = true; 1253 } 1254 ; 1255 1256 type_qualifier_list_opt: /* see C99 6.7.5 */ 1257 /* empty */ { 1258 $$ = NULL; 1259 } 1260 | type_qualifier_list 1261 ; 1262 1263 type_qualifier_list: /* C99 6.7.5 */ 1264 type_qualifier_list_elem 1265 | type_qualifier_list type_qualifier_list_elem { 1266 $$ = merge_qualified_pointer($1, $2); 1267 } 1268 ; 1269 1270 type_qualifier_list_elem: /* helper for 'pointer' */ 1271 type_qualifier { 1272 $$ = xcalloc(1, sizeof(*$$)); 1273 if ($1 == CONST) 1274 $$->p_const = true; 1275 if ($1 == VOLATILE) 1276 $$->p_volatile = true; 1277 } 1278 ; 1279 1280 /* 1281 * For an explanation of 'notype' in the following rules, see 1282 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1283 */ 1284 1285 notype_init_declarators: 1286 notype_init_declarator 1287 | notype_init_declarators T_COMMA type_init_declarator 1288 ; 1289 1290 type_init_declarators: 1291 type_init_declarator 1292 | type_init_declarators T_COMMA type_init_declarator 1293 ; 1294 1295 notype_init_declarator: 1296 notype_declarator asm_or_symbolrename_opt { 1297 cgram_declare($1, false, $2); 1298 check_size($1); 1299 } 1300 | notype_declarator asm_or_symbolrename_opt { 1301 begin_initialization($1); 1302 cgram_declare($1, true, $2); 1303 } T_ASSIGN initializer { 1304 check_size($1); 1305 end_initialization(); 1306 } 1307 ; 1308 1309 type_init_declarator: 1310 type_declarator asm_or_symbolrename_opt { 1311 cgram_declare($1, false, $2); 1312 check_size($1); 1313 } 1314 | type_declarator asm_or_symbolrename_opt { 1315 begin_initialization($1); 1316 cgram_declare($1, true, $2); 1317 } T_ASSIGN initializer { 1318 check_size($1); 1319 end_initialization(); 1320 } 1321 ; 1322 1323 notype_declarator: 1324 notype_direct_declarator 1325 | pointer notype_direct_declarator { 1326 $$ = add_pointer($2, $1); 1327 } 1328 ; 1329 1330 type_declarator: 1331 type_direct_declarator 1332 | pointer type_direct_declarator { 1333 $$ = add_pointer($2, $1); 1334 } 1335 ; 1336 1337 notype_direct_declarator: 1338 type_attribute_list_opt T_NAME { 1339 $$ = declarator_name(getsym($2)); 1340 } 1341 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1342 $$ = $3; 1343 } 1344 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1345 $$ = add_array($1, $3.has_dim, $3.dim); 1346 } 1347 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1348 $$ = add_function(symbolrename($1, $3), $2); 1349 end_declaration_level(); 1350 block_level--; 1351 } 1352 | notype_direct_declarator type_attribute 1353 ; 1354 1355 type_direct_declarator: 1356 type_attribute_list_opt identifier { 1357 $$ = declarator_name(getsym($2)); 1358 } 1359 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1360 $$ = $3; 1361 } 1362 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1363 $$ = add_array($1, $3.has_dim, $3.dim); 1364 } 1365 | type_direct_declarator param_list asm_or_symbolrename_opt { 1366 $$ = add_function(symbolrename($1, $3), $2); 1367 end_declaration_level(); 1368 block_level--; 1369 } 1370 | type_direct_declarator type_attribute 1371 ; 1372 1373 /* 1374 * The two distinct rules type_param_declarator and notype_param_declarator 1375 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1376 * always treated as a typename, not an argument name. For example, after 1377 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1378 * "f(int (double));", not "f(int a);". 1379 */ 1380 type_param_declarator: 1381 direct_param_declarator 1382 | pointer direct_param_declarator { 1383 $$ = add_pointer($2, $1); 1384 } 1385 ; 1386 1387 notype_param_declarator: 1388 direct_notype_param_declarator 1389 | pointer direct_notype_param_declarator { 1390 $$ = add_pointer($2, $1); 1391 } 1392 ; 1393 1394 direct_param_declarator: 1395 identifier type_attribute_list { 1396 $$ = declarator_name(getsym($1)); 1397 } 1398 | identifier { 1399 $$ = declarator_name(getsym($1)); 1400 } 1401 | T_LPAREN notype_param_declarator T_RPAREN { 1402 $$ = $2; 1403 } 1404 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1405 gcc_attribute_specifier_list_opt { 1406 $$ = add_array($1, $3.has_dim, $3.dim); 1407 } 1408 | direct_param_declarator param_list asm_or_symbolrename_opt { 1409 $$ = add_function(symbolrename($1, $3), $2); 1410 end_declaration_level(); 1411 block_level--; 1412 } 1413 ; 1414 1415 direct_notype_param_declarator: 1416 identifier { 1417 $$ = declarator_name(getsym($1)); 1418 } 1419 | T_LPAREN notype_param_declarator T_RPAREN { 1420 $$ = $2; 1421 } 1422 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1423 $$ = add_array($1, $3.has_dim, $3.dim); 1424 } 1425 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1426 $$ = add_function(symbolrename($1, $3), $2); 1427 end_declaration_level(); 1428 block_level--; 1429 } 1430 ; 1431 1432 param_list: 1433 id_list_lparen identifier_list T_RPAREN { 1434 $$ = $2; 1435 } 1436 | abstract_decl_param_list 1437 ; 1438 1439 id_list_lparen: 1440 T_LPAREN { 1441 block_level++; 1442 begin_declaration_level(DLK_PROTO_PARAMS); 1443 } 1444 ; 1445 1446 array_size_opt: 1447 /* empty */ { 1448 $$.has_dim = false; 1449 $$.dim = 0; 1450 } 1451 | T_ASTERISK { 1452 /* since C99; variable length array of unspecified size */ 1453 $$.has_dim = false; /* TODO: maybe change to true */ 1454 $$.dim = 0; /* just as a placeholder */ 1455 } 1456 | array_size { 1457 $$.has_dim = true; 1458 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1459 } 1460 ; 1461 1462 array_size: 1463 type_qualifier_list_opt T_SCLASS constant_expression { 1464 /* C11 6.7.6.3p7 */ 1465 if ($2 != STATIC) 1466 yyerror("Bad attribute"); 1467 /* static array size is a C11 extension */ 1468 c11ism(343); 1469 $$ = $3; 1470 } 1471 | type_qualifier { 1472 /* C11 6.7.6.2 */ 1473 if ($1 != RESTRICT) 1474 yyerror("Bad attribute"); 1475 $$ = NULL; 1476 } 1477 | constant_expression 1478 ; 1479 1480 identifier_list: /* C99 6.7.5 */ 1481 T_NAME { 1482 $$ = old_style_function_parameter_name(getsym($1)); 1483 } 1484 | identifier_list T_COMMA T_NAME { 1485 $$ = concat_symbols($1, 1486 old_style_function_parameter_name(getsym($3))); 1487 } 1488 | identifier_list error 1489 ; 1490 1491 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1492 type_name: /* C99 6.7.6 */ 1493 { 1494 begin_declaration_level(DLK_ABSTRACT); 1495 } abstract_declaration { 1496 end_declaration_level(); 1497 $$ = $2->s_type; 1498 } 1499 ; 1500 1501 abstract_declaration: /* specific to lint */ 1502 begin_type_qualifier_list end_type { 1503 $$ = declare_abstract_type(abstract_name()); 1504 } 1505 | begin_type_specifier_qualifier_list end_type { 1506 $$ = declare_abstract_type(abstract_name()); 1507 } 1508 | begin_type_qualifier_list end_type abstract_declarator { 1509 $$ = declare_abstract_type($3); 1510 } 1511 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1512 $$ = declare_abstract_type($3); 1513 } 1514 ; 1515 1516 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1517 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1518 abstract_declarator: 1519 pointer { 1520 $$ = add_pointer(abstract_name(), $1); 1521 } 1522 | direct_abstract_declarator 1523 | pointer direct_abstract_declarator { 1524 $$ = add_pointer($2, $1); 1525 } 1526 | type_attribute_list direct_abstract_declarator { 1527 $$ = $2; 1528 } 1529 | pointer type_attribute_list direct_abstract_declarator { 1530 $$ = add_pointer($3, $1); 1531 } 1532 ; 1533 1534 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1535 direct_abstract_declarator: 1536 /* TODO: sort rules according to C99 */ 1537 T_LPAREN abstract_declarator T_RPAREN { 1538 $$ = $2; 1539 } 1540 | T_LBRACK array_size_opt T_RBRACK { 1541 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1542 } 1543 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1544 $$ = add_array($1, $3.has_dim, $3.dim); 1545 } 1546 | abstract_decl_param_list asm_or_symbolrename_opt { 1547 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1548 end_declaration_level(); 1549 block_level--; 1550 } 1551 | direct_abstract_declarator abstract_decl_param_list 1552 asm_or_symbolrename_opt { 1553 $$ = add_function(symbolrename($1, $3), $2); 1554 end_declaration_level(); 1555 block_level--; 1556 } 1557 | direct_abstract_declarator type_attribute_list 1558 ; 1559 1560 abstract_decl_param_list: /* specific to lint */ 1561 abstract_decl_lparen T_RPAREN type_attribute_opt { 1562 $$ = NULL; 1563 } 1564 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1565 type_attribute_opt { 1566 dcs->d_prototype = true; 1567 $$ = $2; 1568 } 1569 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1570 $$ = NULL; 1571 } 1572 ; 1573 1574 abstract_decl_lparen: /* specific to lint */ 1575 T_LPAREN { 1576 block_level++; 1577 begin_declaration_level(DLK_PROTO_PARAMS); 1578 } 1579 ; 1580 1581 vararg_parameter_type_list: /* specific to lint */ 1582 parameter_type_list 1583 | parameter_type_list T_COMMA T_ELLIPSIS { 1584 dcs->d_vararg = true; 1585 $$ = $1; 1586 } 1587 | T_ELLIPSIS { 1588 /* TODO: C99 6.7.5 makes this an error as well. */ 1589 if (!allow_trad && !allow_c99) { 1590 /* ANSI C requires formal parameter before '...' */ 1591 error(84); 1592 } else if (allow_c90) { 1593 /* ANSI C requires formal parameter before '...' */ 1594 warning(84); 1595 } 1596 dcs->d_vararg = true; 1597 $$ = NULL; 1598 } 1599 ; 1600 1601 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1602 parameter_type_list: 1603 parameter_declaration 1604 | parameter_type_list T_COMMA parameter_declaration { 1605 $$ = concat_symbols($1, $3); 1606 } 1607 ; 1608 1609 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1610 parameter_declaration: 1611 begin_type_declmods end_type { 1612 /* ^^ There is no check for the missing type-specifier. */ 1613 $$ = declare_argument(abstract_name(), false); 1614 } 1615 | begin_type_declaration_specifiers end_type { 1616 $$ = declare_argument(abstract_name(), false); 1617 } 1618 | begin_type_declmods end_type notype_param_declarator { 1619 /* ^^ There is no check for the missing type-specifier. */ 1620 $$ = declare_argument($3, false); 1621 } 1622 /* 1623 * type_param_declarator is needed because of following conflict: 1624 * "typedef int a; f(int (a));" could be parsed as 1625 * "function with argument a of type int", or 1626 * "function with an abstract argument of type function". 1627 * This grammar realizes the second case. 1628 */ 1629 | begin_type_declaration_specifiers end_type type_param_declarator { 1630 $$ = declare_argument($3, false); 1631 } 1632 | begin_type_declmods end_type abstract_declarator { 1633 /* ^^ There is no check for the missing type-specifier. */ 1634 $$ = declare_argument($3, false); 1635 } 1636 | begin_type_declaration_specifiers end_type abstract_declarator { 1637 $$ = declare_argument($3, false); 1638 } 1639 ; 1640 1641 braced_initializer: 1642 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1643 init_lbrace init_rbrace { 1644 /* empty initializer braces require C23 or later */ 1645 c23ism(353); 1646 } 1647 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1648 | init_lbrace initializer_list comma_opt init_rbrace 1649 ; 1650 1651 initializer: /* C99 6.7.8 "Initialization" */ 1652 assignment_expression { 1653 init_expr($1); 1654 } 1655 | init_lbrace init_rbrace { 1656 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1657 } 1658 | init_lbrace initializer_list comma_opt init_rbrace 1659 /* XXX: What is this error handling for? */ 1660 | error 1661 ; 1662 1663 initializer_list: /* C99 6.7.8 "Initialization" */ 1664 initializer_list_item 1665 | initializer_list T_COMMA initializer_list_item 1666 ; 1667 1668 initializer_list_item: /* helper */ 1669 designation initializer 1670 | initializer 1671 ; 1672 1673 designation: /* C99 6.7.8 "Initialization" */ 1674 begin_designation designator_list T_ASSIGN 1675 | identifier T_COLON { 1676 /* GCC style struct or union member name in initializer */ 1677 gnuism(315); 1678 begin_designation(); 1679 add_designator_member($1); 1680 } 1681 ; 1682 1683 begin_designation: /* lint-specific helper */ 1684 /* empty */ { 1685 begin_designation(); 1686 } 1687 ; 1688 1689 designator_list: /* C99 6.7.8 "Initialization" */ 1690 designator 1691 | designator_list designator 1692 ; 1693 1694 designator: /* C99 6.7.8 "Initialization" */ 1695 T_LBRACK range T_RBRACK { 1696 if (!allow_c99) 1697 /* array initializer with designators is a C99 ... */ 1698 warning(321); 1699 add_designator_subscript($2); 1700 } 1701 | T_POINT identifier { 1702 if (!allow_c99) 1703 /* struct or union member name in initializer is ... */ 1704 warning(313); 1705 add_designator_member($2); 1706 } 1707 ; 1708 1709 static_assert_declaration: 1710 T_STATIC_ASSERT T_LPAREN 1711 constant_expression T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1712 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI /* C23 */ 1713 ; 1714 1715 range: 1716 constant_expression { 1717 $$.lo = to_int_constant($1, true); 1718 $$.hi = $$.lo; 1719 } 1720 | constant_expression T_ELLIPSIS constant_expression { 1721 $$.lo = to_int_constant($1, true); 1722 $$.hi = to_int_constant($3, true); 1723 /* initialization with '[a...b]' is a GCC extension */ 1724 gnuism(340); 1725 } 1726 ; 1727 1728 init_lbrace: /* helper */ 1729 T_LBRACE { 1730 init_lbrace(); 1731 } 1732 ; 1733 1734 init_rbrace: /* helper */ 1735 T_RBRACE { 1736 init_rbrace(); 1737 } 1738 ; 1739 1740 asm_or_symbolrename_opt: /* GCC extensions */ 1741 /* empty */ { 1742 $$ = NULL; 1743 } 1744 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1745 freeyyv(&$3, T_STRING); 1746 $$ = NULL; 1747 } 1748 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1749 gcc_attribute_specifier_list_opt { 1750 $$ = $3; 1751 } 1752 ; 1753 1754 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1755 statement: 1756 expression_statement 1757 | non_expr_statement 1758 ; 1759 1760 non_expr_statement: /* helper for C99 6.8 */ 1761 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1762 | labeled_statement 1763 | compound_statement 1764 | selection_statement 1765 | iteration_statement 1766 | jump_statement { 1767 seen_fallthrough = false; 1768 } 1769 | asm_statement 1770 ; 1771 1772 labeled_statement: /* C99 6.8.1 */ 1773 label gcc_attribute_specifier_list_opt statement 1774 ; 1775 1776 label: 1777 T_NAME T_COLON { 1778 set_symtyp(FLABEL); 1779 named_label(getsym($1)); 1780 } 1781 | T_CASE constant_expression T_COLON { 1782 case_label($2); 1783 seen_fallthrough = true; 1784 } 1785 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1786 /* XXX: We don't fill all cases */ 1787 case_label($2); 1788 seen_fallthrough = true; 1789 } 1790 | T_DEFAULT T_COLON { 1791 default_label(); 1792 seen_fallthrough = true; 1793 } 1794 ; 1795 1796 compound_statement: /* C99 6.8.2 */ 1797 compound_statement_lbrace compound_statement_rbrace 1798 | compound_statement_lbrace block_item_list compound_statement_rbrace 1799 ; 1800 1801 compound_statement_lbrace: 1802 T_LBRACE { 1803 block_level++; 1804 mem_block_level++; 1805 begin_declaration_level(DLK_AUTO); 1806 } 1807 ; 1808 1809 compound_statement_rbrace: 1810 T_RBRACE { 1811 end_declaration_level(); 1812 level_free_all(mem_block_level); 1813 mem_block_level--; 1814 block_level--; 1815 seen_fallthrough = false; 1816 } 1817 ; 1818 1819 block_item_list: /* C99 6.8.2 */ 1820 block_item 1821 | block_item_list block_item { 1822 if ($1 && !$2) 1823 /* declarations after statements is a C99 feature */ 1824 c99ism(327); 1825 $$ = $1 || $2; 1826 } 1827 ; 1828 1829 block_item: /* C99 6.8.2 */ 1830 declaration_or_error { 1831 $$ = false; 1832 restore_warning_flags(); 1833 } 1834 | statement { 1835 $$ = true; 1836 restore_warning_flags(); 1837 } 1838 ; 1839 1840 expression_statement: /* C99 6.8.3 */ 1841 expression T_SEMI { 1842 expr($1, false, false, false, false); 1843 seen_fallthrough = false; 1844 } 1845 | T_SEMI { 1846 check_statement_reachable(); 1847 seen_fallthrough = false; 1848 } 1849 ; 1850 1851 selection_statement: /* C99 6.8.4 */ 1852 if_without_else %prec T_THEN { 1853 save_warning_flags(); 1854 stmt_if_then_stmt(); 1855 stmt_if_else_stmt(false); 1856 } 1857 | if_without_else T_ELSE { 1858 save_warning_flags(); 1859 stmt_if_then_stmt(); 1860 } statement { 1861 clear_warning_flags(); 1862 stmt_if_else_stmt(true); 1863 } 1864 | if_without_else T_ELSE error { 1865 clear_warning_flags(); 1866 stmt_if_else_stmt(false); 1867 } 1868 | switch_expr statement { 1869 clear_warning_flags(); 1870 stmt_switch_expr_stmt(); 1871 } 1872 | switch_expr error { 1873 clear_warning_flags(); 1874 stmt_switch_expr_stmt(); 1875 } 1876 ; 1877 1878 if_without_else: /* see C99 6.8.4 */ 1879 if_expr statement 1880 | if_expr error 1881 ; 1882 1883 if_expr: /* see C99 6.8.4 */ 1884 T_IF T_LPAREN expression T_RPAREN { 1885 stmt_if_expr($3); 1886 clear_warning_flags(); 1887 } 1888 ; 1889 1890 switch_expr: /* see C99 6.8.4 */ 1891 T_SWITCH T_LPAREN expression T_RPAREN { 1892 stmt_switch_expr($3); 1893 clear_warning_flags(); 1894 } 1895 ; 1896 1897 iteration_statement: /* C99 6.8.5 */ 1898 while_expr statement { 1899 clear_warning_flags(); 1900 stmt_while_expr_stmt(); 1901 } 1902 | while_expr error { 1903 clear_warning_flags(); 1904 stmt_while_expr_stmt(); 1905 } 1906 | do_statement do_while_expr { 1907 stmt_do_while_expr($2); 1908 seen_fallthrough = false; 1909 } 1910 | do error { 1911 clear_warning_flags(); 1912 stmt_do_while_expr(NULL); 1913 } 1914 | for_exprs statement { 1915 clear_warning_flags(); 1916 stmt_for_exprs_stmt(); 1917 end_declaration_level(); 1918 block_level--; 1919 } 1920 | for_exprs error { 1921 clear_warning_flags(); 1922 stmt_for_exprs_stmt(); 1923 end_declaration_level(); 1924 block_level--; 1925 } 1926 ; 1927 1928 while_expr: /* see C99 6.8.5 */ 1929 T_WHILE T_LPAREN expression T_RPAREN { 1930 stmt_while_expr($3); 1931 clear_warning_flags(); 1932 } 1933 ; 1934 1935 do_statement: /* see C99 6.8.5 */ 1936 do statement { 1937 clear_warning_flags(); 1938 } 1939 ; 1940 1941 do: /* see C99 6.8.5 */ 1942 T_DO { 1943 stmt_do(); 1944 } 1945 ; 1946 1947 do_while_expr: /* see C99 6.8.5 */ 1948 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1949 $$ = $3; 1950 } 1951 ; 1952 1953 for_start: /* see C99 6.8.5 */ 1954 T_FOR T_LPAREN { 1955 begin_declaration_level(DLK_AUTO); 1956 block_level++; 1957 } 1958 ; 1959 1960 for_exprs: /* see C99 6.8.5 */ 1961 for_start 1962 begin_type_declaration_specifiers end_type 1963 notype_init_declarators T_SEMI 1964 expression_opt T_SEMI 1965 expression_opt T_RPAREN { 1966 /* variable declaration in for loop */ 1967 c99ism(325); 1968 stmt_for_exprs(NULL, $6, $8); 1969 clear_warning_flags(); 1970 } 1971 | for_start 1972 expression_opt T_SEMI 1973 expression_opt T_SEMI 1974 expression_opt T_RPAREN { 1975 stmt_for_exprs($2, $4, $6); 1976 clear_warning_flags(); 1977 } 1978 ; 1979 1980 jump_statement: /* C99 6.8.6 */ 1981 goto identifier T_SEMI { 1982 stmt_goto(getsym($2)); 1983 } 1984 | goto error T_SEMI { 1985 set_symtyp(FVFT); 1986 } 1987 | T_CONTINUE T_SEMI { 1988 stmt_continue(); 1989 } 1990 | T_BREAK T_SEMI { 1991 stmt_break(); 1992 } 1993 | T_RETURN sys T_SEMI { 1994 stmt_return($2, NULL); 1995 } 1996 | T_RETURN sys expression T_SEMI { 1997 stmt_return($2, $3); 1998 } 1999 ; 2000 2001 goto: /* see C99 6.8.6 */ 2002 T_GOTO { 2003 set_symtyp(FLABEL); 2004 } 2005 ; 2006 2007 asm_statement: /* GCC extension */ 2008 T_ASM T_LPAREN read_until_rparen T_SEMI { 2009 dcs_set_asm(); 2010 } 2011 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2012 dcs_set_asm(); 2013 } 2014 | T_ASM error 2015 ; 2016 2017 read_until_rparen: /* helper for 'asm_statement' */ 2018 /* empty */ { 2019 read_until_rparen(); 2020 } 2021 ; 2022 2023 translation_unit: /* C99 6.9 */ 2024 external_declaration 2025 | translation_unit external_declaration 2026 ; 2027 2028 external_declaration: /* C99 6.9 */ 2029 function_definition { 2030 global_clean_up_decl(false); 2031 clear_warning_flags(); 2032 } 2033 | top_level_declaration { 2034 global_clean_up_decl(false); 2035 clear_warning_flags(); 2036 } 2037 | asm_statement /* GCC extension */ 2038 | T_SEMI { /* GCC extension */ 2039 /* 2040 * TODO: Only allow this in GCC mode, not in plain C99. 2041 * This is one of the top 10 warnings in the NetBSD build. 2042 */ 2043 if (!allow_trad && !allow_c99) { 2044 /* empty declaration */ 2045 error(0); 2046 } else if (allow_c90) { 2047 /* empty declaration */ 2048 warning(0); 2049 } 2050 } 2051 ; 2052 2053 /* 2054 * On the top level, lint allows several forms of declarations that it doesn't 2055 * allow in functions. For example, a single ';' is an empty declaration and 2056 * is supported by some compilers, but in a function it would be an empty 2057 * statement, not a declaration. This makes a difference in C90 mode, where 2058 * a statement must not be followed by a declaration. 2059 * 2060 * See 'declaration' for all other declarations. 2061 */ 2062 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2063 begin_type end_type notype_init_declarators T_SEMI { 2064 /* TODO: Make this an error in C99 mode as well. */ 2065 if (!allow_trad && !allow_c99) { 2066 /* old-style declaration; add 'int' */ 2067 error(1); 2068 } else if (allow_c90) { 2069 /* old-style declaration; add 'int' */ 2070 warning(1); 2071 } 2072 } 2073 | declaration 2074 | error T_SEMI { 2075 global_clean_up(); 2076 } 2077 | error T_RBRACE { 2078 global_clean_up(); 2079 } 2080 ; 2081 2082 function_definition: /* C99 6.9.1 */ 2083 func_declarator { 2084 if ($1->s_type->t_tspec != FUNC) { 2085 /* syntax error '%s' */ 2086 error(249, yytext); 2087 YYERROR; 2088 } 2089 if ($1->s_type->t_typedef) { 2090 /* ()-less function definition */ 2091 error(64); 2092 YYERROR; 2093 } 2094 check_extern_declaration($1); 2095 begin_function($1); 2096 block_level++; 2097 begin_declaration_level(DLK_OLD_STYLE_ARGS); 2098 if (lwarn == LWARN_NONE) 2099 $1->s_used = true; 2100 } arg_declaration_list_opt { 2101 end_declaration_level(); 2102 block_level--; 2103 check_func_lint_directives(); 2104 check_func_old_style_arguments(); 2105 begin_control_statement(CS_FUNCTION_BODY); 2106 } compound_statement { 2107 end_function(); 2108 end_control_statement(CS_FUNCTION_BODY); 2109 } 2110 ; 2111 2112 func_declarator: 2113 begin_type end_type notype_declarator { 2114 if (!allow_trad) { 2115 /* old-style declaration; add 'int' */ 2116 error(1); 2117 } 2118 $$ = $3; 2119 } 2120 | begin_type_declmods end_type notype_declarator { 2121 if (!allow_trad) { 2122 /* old-style declaration; add 'int' */ 2123 error(1); 2124 } 2125 $$ = $3; 2126 } 2127 | begin_type_declaration_specifiers end_type type_declarator { 2128 $$ = $3; 2129 } 2130 ; 2131 2132 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2133 /* empty */ 2134 | arg_declaration_list 2135 ; 2136 2137 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2138 arg_declaration 2139 | arg_declaration_list arg_declaration 2140 /* XXX or better "arg_declaration error" ? */ 2141 | error 2142 ; 2143 2144 /* 2145 * "arg_declaration" is separated from "declaration" because it 2146 * needs other error handling. 2147 */ 2148 arg_declaration: 2149 begin_type_declmods end_type T_SEMI { 2150 /* empty declaration */ 2151 warning(2); 2152 } 2153 | begin_type_declmods end_type notype_init_declarators T_SEMI 2154 | begin_type_declaration_specifiers end_type T_SEMI { 2155 if (!dcs->d_nonempty_decl) { 2156 /* empty declaration */ 2157 warning(2); 2158 } else { 2159 /* '%s' declared in argument declaration list */ 2160 warning(3, type_name(dcs->d_type)); 2161 } 2162 } 2163 | begin_type_declaration_specifiers end_type 2164 type_init_declarators T_SEMI { 2165 if (dcs->d_nonempty_decl) { 2166 /* '%s' declared in argument declaration list */ 2167 warning(3, type_name(dcs->d_type)); 2168 } 2169 } 2170 | begin_type_declmods error 2171 | begin_type_declaration_specifiers error 2172 ; 2173 2174 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2175 gcc_attribute_specifier_list_opt: 2176 /* empty */ 2177 | gcc_attribute_specifier_list 2178 ; 2179 2180 gcc_attribute_specifier_list: 2181 gcc_attribute_specifier 2182 | gcc_attribute_specifier_list gcc_attribute_specifier 2183 ; 2184 2185 gcc_attribute_specifier: 2186 T_ATTRIBUTE T_LPAREN T_LPAREN { 2187 in_gcc_attribute = true; 2188 } gcc_attribute_list { 2189 in_gcc_attribute = false; 2190 } T_RPAREN T_RPAREN 2191 ; 2192 2193 gcc_attribute_list: 2194 gcc_attribute 2195 | gcc_attribute_list T_COMMA gcc_attribute 2196 ; 2197 2198 gcc_attribute: 2199 /* empty */ 2200 | T_NAME { 2201 const char *name = $1->sb_name; 2202 if (is_either(name, "packed", "__packed__")) 2203 dcs_add_packed(); 2204 else if (is_either(name, "used", "__used__") || 2205 is_either(name, "unused", "__unused__")) 2206 dcs_set_used(); 2207 else if (is_either(name, "fallthrough", "__fallthrough__")) 2208 fallthru(1); 2209 } 2210 | T_NAME T_LPAREN T_RPAREN 2211 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2212 | type_qualifier { 2213 if ($1 != CONST) 2214 yyerror("Bad attribute"); 2215 } 2216 ; 2217 2218 gcc_attribute_parameters: 2219 constant_expression 2220 | gcc_attribute_parameters T_COMMA constant_expression 2221 ; 2222 2223 sys: 2224 /* empty */ { 2225 $$ = in_system_header; 2226 } 2227 ; 2228 2229 %% 2230 2231 /* ARGSUSED */ 2232 int 2233 yyerror(const char *msg) 2234 { 2235 /* syntax error '%s' */ 2236 error(249, yytext); 2237 if (++sytxerr >= 5) 2238 norecover(); 2239 return 0; 2240 } 2241 2242 #if YYDEBUG && YYBYACC 2243 static const char * 2244 cgram_to_string(int token, YYSTYPE val) 2245 { 2246 2247 switch (token) { 2248 case T_INCDEC: 2249 case T_MULTIPLICATIVE: 2250 case T_ADDITIVE: 2251 case T_SHIFT: 2252 case T_RELATIONAL: 2253 case T_EQUALITY: 2254 case T_OPASSIGN: 2255 return op_name(val.y_op); 2256 case T_SCLASS: 2257 return scl_name(val.y_scl); 2258 case T_TYPE: 2259 case T_STRUCT_OR_UNION: 2260 return tspec_name(val.y_tspec); 2261 case T_QUAL: 2262 return tqual_name(val.y_tqual); 2263 case T_FUNCTION_SPECIFIER: 2264 return function_specifier_name(val.y_function_specifier); 2265 case T_NAME: 2266 return val.y_name->sb_name; 2267 default: 2268 return "<none>"; 2269 } 2270 } 2271 #endif 2272 2273 static void 2274 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2275 { 2276 declare(decl, has_initializer, renaming); 2277 if (renaming != NULL) 2278 freeyyv(&renaming, T_NAME); 2279 } 2280 2281 /* 2282 * Discard all input tokens up to and including the next 2283 * unmatched right paren 2284 */ 2285 static void 2286 read_until_rparen(void) 2287 { 2288 int level; 2289 2290 if (yychar < 0) 2291 yychar = yylex(); 2292 freeyyv(&yylval, yychar); 2293 2294 level = 1; 2295 while (yychar > 0) { 2296 if (yychar == T_LPAREN) 2297 level++; 2298 if (yychar == T_RPAREN && --level == 0) 2299 break; 2300 freeyyv(&yylval, yychar = yylex()); 2301 } 2302 2303 yyclearin; 2304 } 2305 2306 static sym_t * 2307 symbolrename(sym_t *s, sbuf_t *sb) 2308 { 2309 if (sb != NULL) 2310 s->s_rename = sb->sb_name; 2311 return s; 2312 } 2313
Indexes created Fri Oct 03 02:09:57 GMT 2025