cgram.y revision 1.475
1 %{ 2 /* $NetBSD: cgram.y,v 1.475 2023/10/17 19:29:09 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 1.475 2023/10/17 19:29:09 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 parameters 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 bool y_inc; 142 op_t y_op; 143 scl_t y_scl; 144 tspec_t y_tspec; 145 type_qualifiers y_type_qualifiers; 146 function_specifier y_function_specifier; 147 struct parameter_list y_parameter_list; 148 type_t *y_type; 149 tnode_t *y_tnode; 150 range_t y_range; 151 strg_t *y_string; 152 qual_ptr *y_qual_ptr; 153 bool y_seen_statement; 154 struct generic_association *y_generic; 155 struct array_size y_array_size; 156 bool y_in_system_header; 157 }; 158 159 /* for Bison: 160 %printer { 161 if (is_integer($$->v_tspec)) 162 fprintf(yyo, "%lld", (long long)$$->u.integer); 163 else 164 fprintf(yyo, "%Lg", $$->u.floating); 165 } <y_val> 166 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 167 %printer { 168 bool indented = debug_push_indented(true); 169 debug_sym("", $$, ""); 170 debug_pop_indented(indented); 171 } <y_sym> 172 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 173 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 174 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 175 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 176 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 177 %printer { 178 fprintf(yyo, "%s", function_specifier_name($$)); 179 } <y_function_specifier> 180 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 181 %printer { 182 if ($$ == NULL) 183 fprintf(yyo, "<null>"); 184 else 185 fprintf(yyo, "%s '%s'", 186 op_name($$->tn_op), type_name($$->tn_type)); 187 } <y_tnode> 188 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 189 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 190 %printer { 191 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 192 } <y_qual_ptr> 193 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 194 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 195 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 196 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 197 */ 198 199 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 200 %token T_POINT T_ARROW 201 %token T_COMPLEMENT T_LOGNOT 202 %token <y_inc> T_INCDEC 203 %token T_SIZEOF 204 %token T_BUILTIN_OFFSETOF 205 %token T_TYPEOF 206 %token T_EXTENSION 207 %token T_ALIGNAS 208 %token T_ALIGNOF 209 %token T_ASTERISK 210 %token <y_op> T_MULTIPLICATIVE 211 %token <y_op> T_ADDITIVE 212 %token <y_op> T_SHIFT 213 %token <y_op> T_RELATIONAL 214 %token <y_op> T_EQUALITY 215 %token T_AMPER 216 %token T_BITXOR 217 %token T_BITOR 218 %token T_LOGAND 219 %token T_LOGOR 220 %token T_QUEST 221 %token T_COLON 222 %token T_ASSIGN 223 %token <y_op> T_OPASSIGN 224 %token T_COMMA 225 %token T_SEMI 226 %token T_ELLIPSIS 227 %token T_REAL 228 %token T_IMAG 229 %token T_GENERIC 230 231 /* storage classes (extern, static, auto, register and typedef) */ 232 %token <y_scl> T_SCLASS 233 %token <y_function_specifier> T_FUNCTION_SPECIFIER 234 235 /* 236 * predefined type keywords (char, int, short, long, unsigned, signed, 237 * float, double, void); see T_TYPENAME for types from typedef 238 */ 239 %token <y_tspec> T_TYPE 240 241 %token <y_type_qualifiers> T_QUAL 242 %token <y_type_qualifiers> T_ATOMIC 243 244 /* struct or union */ 245 %token <y_tspec> T_STRUCT_OR_UNION 246 247 /* remaining keywords */ 248 %token T_ASM 249 %token T_BREAK 250 %token T_CASE 251 %token T_CONTINUE 252 %token T_DEFAULT 253 %token T_DO 254 %token T_ELSE 255 %token T_ENUM 256 %token T_FOR 257 %token T_GOTO 258 %token T_IF 259 %token T_PACKED 260 %token T_RETURN 261 %token T_SWITCH 262 %token T_SYMBOLRENAME 263 %token T_WHILE 264 %token T_STATIC_ASSERT 265 266 %token T_ATTRIBUTE 267 268 %left T_THEN 269 %left T_ELSE 270 %right T_QUEST T_COLON 271 %left T_LOGOR 272 %left T_LOGAND 273 %left T_BITOR 274 %left T_BITXOR 275 %left T_AMPER 276 %left T_EQUALITY 277 %left T_RELATIONAL 278 %left T_SHIFT 279 %left T_ADDITIVE 280 %left T_ASTERISK T_MULTIPLICATIVE 281 282 %token <y_name> T_NAME 283 %token <y_name> T_TYPENAME 284 %token <y_val> T_CON 285 %token <y_string> T_STRING 286 287 /* No type for program. */ 288 %type <y_sym> identifier_sym 289 %type <y_name> identifier 290 %type <y_string> string 291 %type <y_tnode> primary_expression 292 %type <y_tnode> generic_selection 293 %type <y_generic> generic_assoc_list 294 %type <y_generic> generic_association 295 %type <y_tnode> postfix_expression 296 /* No type for comma_opt. */ 297 %type <y_tnode> gcc_statement_expr_list 298 %type <y_tnode> gcc_statement_expr_item 299 %type <y_op> point_or_arrow 300 %type <y_tnode> argument_expression_list 301 %type <y_tnode> unary_expression 302 %type <y_tnode> cast_expression 303 %type <y_tnode> expression_opt 304 %type <y_tnode> conditional_expression 305 %type <y_tnode> assignment_expression 306 %type <y_tnode> expression 307 %type <y_tnode> constant_expression 308 /* No type for declaration_or_error. */ 309 /* No type for declaration. */ 310 /* No type for begin_type_declaration_specifiers. */ 311 /* No type for begin_type_declmods. */ 312 /* No type for begin_type_specifier_qualifier_list. */ 313 /* No type for begin_type_specifier_qualifier_list_postfix. */ 314 %type <y_type> begin_type_typespec 315 /* No type for begin_type_qualifier_list. */ 316 /* No type for declmod. */ 317 /* No type for type_attribute_list_opt. */ 318 /* No type for type_attribute_list. */ 319 /* No type for type_attribute_opt. */ 320 /* No type for type_attribute. */ 321 /* No type for begin_type. */ 322 /* No type for end_type. */ 323 %type <y_type> type_specifier 324 %type <y_type> notype_type_specifier 325 %type <y_type> atomic_type_specifier 326 %type <y_type> struct_or_union_specifier 327 %type <y_tspec> struct_or_union 328 %type <y_sym> braced_member_declaration_list 329 /* No type for member_declaration_lbrace. */ 330 %type <y_sym> member_declaration_list_with_rbrace 331 %type <y_sym> member_declaration_list 332 %type <y_sym> member_declaration 333 %type <y_sym> notype_member_declarators 334 %type <y_sym> type_member_declarators 335 %type <y_sym> notype_member_declarator 336 %type <y_sym> type_member_declarator 337 %type <y_type> enum_specifier 338 /* No type for enum. */ 339 %type <y_sym> enum_declaration 340 /* No type for enum_decl_lbrace. */ 341 %type <y_sym> enums_with_opt_comma 342 %type <y_sym> enumerator_list 343 %type <y_sym> enumerator 344 %type <y_type_qualifiers> type_qualifier 345 /* No type for atomic. */ 346 %type <y_qual_ptr> pointer 347 %type <y_type_qualifiers> type_qualifier_list_opt 348 %type <y_type_qualifiers> type_qualifier_list 349 /* No type for notype_init_declarators. */ 350 /* No type for type_init_declarators. */ 351 /* No type for notype_init_declarator. */ 352 /* No type for type_init_declarator. */ 353 %type <y_sym> notype_declarator 354 %type <y_sym> type_declarator 355 %type <y_sym> notype_direct_declarator 356 %type <y_sym> type_direct_declarator 357 %type <y_sym> type_param_declarator 358 %type <y_sym> notype_param_declarator 359 %type <y_sym> direct_param_declarator 360 %type <y_sym> direct_notype_param_declarator 361 %type <y_parameter_list> param_list 362 /* No type for id_list_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_parameter_list> abstract_decl_param_list 371 /* No type for abstract_decl_lparen. */ 372 %type <y_parameter_list> vararg_parameter_type_list 373 %type <y_parameter_list> 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(*$$), "generic"); 530 $$->ga_arg = $1; 531 $$->ga_result = $3; 532 } 533 | T_DEFAULT T_COLON assignment_expression { 534 $$ = block_zero_alloc(sizeof(*$$), "generic"); 535 $$->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 ? 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 suppress_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 ? 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_qualifiers($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_qualifiers($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_qualifiers($2); 893 } 894 | begin_type_qualifier_list type_qualifier { 895 dcs_add_qualifiers($2); 896 } 897 ; 898 899 declmod: 900 type_qualifier { 901 dcs_add_qualifiers($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 $$ = concat_symbols($1, $2); 1047 } 1048 ; 1049 1050 /* Was named struct_declaration until C11. */ 1051 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1052 member_declaration: 1053 begin_type_qualifier_list end_type { 1054 /* ^^ There is no check for the missing type-specifier. */ 1055 /* too late, i know, but getsym() compensates it */ 1056 set_symtyp(FMEMBER); 1057 } notype_member_declarators T_SEMI { 1058 set_symtyp(FVFT); 1059 $$ = $4; 1060 } 1061 | begin_type_specifier_qualifier_list end_type { 1062 set_symtyp(FMEMBER); 1063 } type_member_declarators 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 type_attribute_list_opt { 1138 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1139 } 1140 | { 1141 set_symtyp(FVFT); 1142 } T_COLON constant_expression type_attribute_list_opt { 1143 $$ = 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 $$ = (type_qualifiers){ .tq_atomic = true }; 1227 } 1228 ; 1229 1230 atomic: /* helper */ 1231 T_ATOMIC { 1232 /* TODO: First fix c11ism, then use it here. */ 1233 if (!allow_c11) 1234 /* '_Atomic' requires C11 or later */ 1235 error(350); 1236 } 1237 ; 1238 1239 pointer: /* C99 6.7.5 */ 1240 T_ASTERISK type_qualifier_list_opt { 1241 $$ = xcalloc(1, sizeof(*$$)); 1242 add_type_qualifiers(&$$->qualifiers, $2); 1243 } 1244 | T_ASTERISK type_qualifier_list_opt pointer { 1245 $$ = xcalloc(1, sizeof(*$$)); 1246 add_type_qualifiers(&$$->qualifiers, $2); 1247 $$ = append_qualified_pointer($$, $3); 1248 } 1249 ; 1250 1251 type_qualifier_list_opt: /* see C99 6.7.5 */ 1252 /* empty */ { 1253 $$ = (type_qualifiers){ .tq_const = false }; 1254 } 1255 | type_qualifier_list 1256 ; 1257 1258 type_qualifier_list: /* C99 6.7.5 */ 1259 type_qualifier 1260 | type_qualifier_list type_qualifier { 1261 $$ = $1; 1262 add_type_qualifiers(&$$, $2); 1263 } 1264 ; 1265 1266 /* 1267 * For an explanation of 'notype' in the following rules, see 1268 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1269 */ 1270 1271 notype_init_declarators: 1272 notype_init_declarator 1273 | notype_init_declarators T_COMMA type_init_declarator 1274 ; 1275 1276 type_init_declarators: 1277 type_init_declarator 1278 | type_init_declarators T_COMMA type_init_declarator 1279 ; 1280 1281 notype_init_declarator: 1282 notype_declarator asm_or_symbolrename_opt { 1283 cgram_declare($1, false, $2); 1284 check_size($1); 1285 } 1286 | notype_declarator asm_or_symbolrename_opt { 1287 begin_initialization($1); 1288 cgram_declare($1, true, $2); 1289 } T_ASSIGN initializer { 1290 check_size($1); 1291 end_initialization(); 1292 } 1293 ; 1294 1295 type_init_declarator: 1296 type_declarator asm_or_symbolrename_opt { 1297 cgram_declare($1, false, $2); 1298 check_size($1); 1299 } 1300 | type_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 notype_declarator: 1310 notype_direct_declarator 1311 | pointer notype_direct_declarator { 1312 $$ = add_pointer($2, $1); 1313 } 1314 ; 1315 1316 type_declarator: 1317 type_direct_declarator 1318 | pointer type_direct_declarator { 1319 $$ = add_pointer($2, $1); 1320 } 1321 ; 1322 1323 notype_direct_declarator: 1324 type_attribute_list_opt T_NAME { 1325 $$ = declarator_name(getsym($2)); 1326 } 1327 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1328 $$ = $3; 1329 } 1330 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1331 $$ = add_array($1, $3.has_dim, $3.dim); 1332 } 1333 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1334 $$ = add_function(symbolrename($1, $3), $2); 1335 end_declaration_level(); 1336 block_level--; 1337 } 1338 | notype_direct_declarator type_attribute 1339 ; 1340 1341 type_direct_declarator: 1342 type_attribute_list_opt identifier { 1343 $$ = declarator_name(getsym($2)); 1344 } 1345 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1346 $$ = $3; 1347 } 1348 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1349 $$ = add_array($1, $3.has_dim, $3.dim); 1350 } 1351 | type_direct_declarator param_list asm_or_symbolrename_opt { 1352 $$ = add_function(symbolrename($1, $3), $2); 1353 end_declaration_level(); 1354 block_level--; 1355 } 1356 | type_direct_declarator type_attribute 1357 ; 1358 1359 /* 1360 * The two distinct rules type_param_declarator and notype_param_declarator 1361 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1362 * always treated as a typename, not an argument name. For example, after 1363 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1364 * "f(int (double));", not "f(int a);". 1365 */ 1366 type_param_declarator: 1367 direct_param_declarator 1368 | pointer direct_param_declarator { 1369 $$ = add_pointer($2, $1); 1370 } 1371 ; 1372 1373 notype_param_declarator: 1374 direct_notype_param_declarator 1375 | pointer direct_notype_param_declarator { 1376 $$ = add_pointer($2, $1); 1377 } 1378 ; 1379 1380 direct_param_declarator: 1381 identifier type_attribute_list { 1382 $$ = declarator_name(getsym($1)); 1383 } 1384 | identifier { 1385 $$ = declarator_name(getsym($1)); 1386 } 1387 | T_LPAREN notype_param_declarator T_RPAREN { 1388 $$ = $2; 1389 } 1390 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1391 gcc_attribute_specifier_list_opt { 1392 $$ = add_array($1, $3.has_dim, $3.dim); 1393 } 1394 | direct_param_declarator param_list asm_or_symbolrename_opt { 1395 $$ = add_function(symbolrename($1, $3), $2); 1396 end_declaration_level(); 1397 block_level--; 1398 } 1399 ; 1400 1401 direct_notype_param_declarator: 1402 identifier { 1403 $$ = declarator_name(getsym($1)); 1404 } 1405 | T_LPAREN notype_param_declarator T_RPAREN { 1406 $$ = $2; 1407 } 1408 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1409 $$ = add_array($1, $3.has_dim, $3.dim); 1410 } 1411 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1412 $$ = add_function(symbolrename($1, $3), $2); 1413 end_declaration_level(); 1414 block_level--; 1415 } 1416 ; 1417 1418 param_list: 1419 id_list_lparen identifier_list T_RPAREN { 1420 $$ = (struct parameter_list){ .first = $2 }; 1421 } 1422 | abstract_decl_param_list 1423 ; 1424 1425 id_list_lparen: 1426 T_LPAREN { 1427 block_level++; 1428 begin_declaration_level(DLK_PROTO_PARAMS); 1429 } 1430 ; 1431 1432 array_size_opt: 1433 /* empty */ { 1434 $$.has_dim = false; 1435 $$.dim = 0; 1436 } 1437 | T_ASTERISK { 1438 /* since C99; variable length array of unspecified size */ 1439 $$.has_dim = false; /* TODO: maybe change to true */ 1440 $$.dim = 0; /* just as a placeholder */ 1441 } 1442 | array_size { 1443 $$.has_dim = true; 1444 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1445 } 1446 ; 1447 1448 array_size: 1449 type_qualifier_list_opt T_SCLASS constant_expression { 1450 /* C11 6.7.6.3p7 */ 1451 if ($2 != STATIC) 1452 yyerror("Bad attribute"); 1453 /* static array size requires C11 or later */ 1454 c11ism(343); 1455 $$ = $3; 1456 } 1457 | type_qualifier { 1458 /* C11 6.7.6.2 */ 1459 if (!$1.tq_restrict) 1460 yyerror("Bad attribute"); 1461 $$ = NULL; 1462 } 1463 | constant_expression 1464 ; 1465 1466 identifier_list: /* C99 6.7.5 */ 1467 T_NAME { 1468 $$ = old_style_function_parameter_name(getsym($1)); 1469 } 1470 | identifier_list T_COMMA T_NAME { 1471 $$ = concat_symbols($1, 1472 old_style_function_parameter_name(getsym($3))); 1473 } 1474 | identifier_list error 1475 ; 1476 1477 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1478 type_name: /* C99 6.7.6 */ 1479 { 1480 begin_declaration_level(DLK_ABSTRACT); 1481 } abstract_declaration { 1482 end_declaration_level(); 1483 $$ = $2->s_type; 1484 } 1485 ; 1486 1487 abstract_declaration: /* specific to lint */ 1488 begin_type_qualifier_list end_type { 1489 $$ = declare_abstract_type(abstract_name()); 1490 } 1491 | begin_type_specifier_qualifier_list end_type { 1492 $$ = declare_abstract_type(abstract_name()); 1493 } 1494 | begin_type_qualifier_list end_type abstract_declarator { 1495 $$ = declare_abstract_type($3); 1496 } 1497 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1498 $$ = declare_abstract_type($3); 1499 } 1500 ; 1501 1502 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1503 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1504 abstract_declarator: 1505 pointer { 1506 $$ = add_pointer(abstract_name(), $1); 1507 } 1508 | direct_abstract_declarator 1509 | pointer direct_abstract_declarator { 1510 $$ = add_pointer($2, $1); 1511 } 1512 | type_attribute_list direct_abstract_declarator { 1513 $$ = $2; 1514 } 1515 | pointer type_attribute_list direct_abstract_declarator { 1516 $$ = add_pointer($3, $1); 1517 } 1518 ; 1519 1520 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1521 direct_abstract_declarator: 1522 /* TODO: sort rules according to C99 */ 1523 T_LPAREN abstract_declarator T_RPAREN { 1524 $$ = $2; 1525 } 1526 | T_LBRACK array_size_opt T_RBRACK { 1527 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1528 } 1529 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1530 $$ = add_array($1, $3.has_dim, $3.dim); 1531 } 1532 | abstract_decl_param_list asm_or_symbolrename_opt { 1533 sym_t *name = abstract_enclosing_name(); 1534 $$ = add_function(symbolrename(name, $2), $1); 1535 end_declaration_level(); 1536 block_level--; 1537 } 1538 | direct_abstract_declarator abstract_decl_param_list 1539 asm_or_symbolrename_opt { 1540 $$ = add_function(symbolrename($1, $3), $2); 1541 end_declaration_level(); 1542 block_level--; 1543 } 1544 | direct_abstract_declarator type_attribute_list 1545 ; 1546 1547 abstract_decl_param_list: /* specific to lint */ 1548 abstract_decl_lparen T_RPAREN type_attribute_opt { 1549 $$ = (struct parameter_list){ .first = NULL }; 1550 } 1551 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1552 type_attribute_opt { 1553 $$ = $2; 1554 $$.prototype = true; 1555 } 1556 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1557 $$ = (struct parameter_list){ .first = NULL }; 1558 } 1559 ; 1560 1561 abstract_decl_lparen: /* specific to lint */ 1562 T_LPAREN { 1563 block_level++; 1564 begin_declaration_level(DLK_PROTO_PARAMS); 1565 } 1566 ; 1567 1568 vararg_parameter_type_list: /* specific to lint */ 1569 parameter_type_list 1570 | parameter_type_list T_COMMA T_ELLIPSIS { 1571 $$ = $1; 1572 $$.vararg = true; 1573 } 1574 | T_ELLIPSIS { 1575 /* TODO: C99 6.7.5 makes this an error as well. */ 1576 if (!allow_trad && !allow_c99) { 1577 /* C90 to C17 require formal parameter before '...' */ 1578 error(84); 1579 } else if (allow_c90) { 1580 /* C90 to C17 require formal parameter before '...' */ 1581 warning(84); 1582 } 1583 $$ = (struct parameter_list){ .vararg = true }; 1584 } 1585 ; 1586 1587 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1588 parameter_type_list: 1589 parameter_declaration { 1590 $$ = (struct parameter_list){ .first = $1 }; 1591 } 1592 | parameter_type_list T_COMMA parameter_declaration { 1593 $$ = $1; 1594 $$.first = concat_symbols($1.first, $3); 1595 } 1596 ; 1597 1598 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1599 parameter_declaration: 1600 begin_type_declmods end_type { 1601 /* ^^ There is no check for the missing type-specifier. */ 1602 $$ = declare_parameter(abstract_name(), false); 1603 } 1604 | begin_type_declaration_specifiers end_type { 1605 $$ = declare_parameter(abstract_name(), false); 1606 } 1607 | begin_type_declmods end_type notype_param_declarator { 1608 /* ^^ There is no check for the missing type-specifier. */ 1609 $$ = declare_parameter($3, false); 1610 } 1611 /* 1612 * type_param_declarator is needed because of following conflict: 1613 * "typedef int a; f(int (a));" could be parsed as 1614 * "function with argument a of type int", or 1615 * "function with an unnamed (abstract) argument of type function". 1616 * This grammar realizes the second case. 1617 */ 1618 | begin_type_declaration_specifiers end_type type_param_declarator { 1619 $$ = declare_parameter($3, false); 1620 } 1621 | begin_type_declmods end_type abstract_declarator { 1622 /* ^^ There is no check for the missing type-specifier. */ 1623 $$ = declare_parameter($3, false); 1624 } 1625 | begin_type_declaration_specifiers end_type abstract_declarator { 1626 $$ = declare_parameter($3, false); 1627 } 1628 ; 1629 1630 braced_initializer: 1631 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1632 init_lbrace init_rbrace { 1633 /* empty initializer braces require C23 or later */ 1634 c23ism(353); 1635 } 1636 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1637 | init_lbrace initializer_list comma_opt init_rbrace 1638 ; 1639 1640 initializer: /* C99 6.7.8 "Initialization" */ 1641 assignment_expression { 1642 init_expr($1); 1643 } 1644 | init_lbrace init_rbrace { 1645 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1646 } 1647 | init_lbrace initializer_list comma_opt init_rbrace 1648 /* XXX: What is this error handling for? */ 1649 | error 1650 ; 1651 1652 initializer_list: /* C99 6.7.8 "Initialization" */ 1653 initializer_list_item 1654 | initializer_list T_COMMA initializer_list_item 1655 ; 1656 1657 initializer_list_item: /* helper */ 1658 designation initializer 1659 | initializer 1660 ; 1661 1662 designation: /* C99 6.7.8 "Initialization" */ 1663 begin_designation designator_list T_ASSIGN 1664 | identifier T_COLON { 1665 /* GCC style struct or union member name in initializer */ 1666 gnuism(315); 1667 begin_designation(); 1668 add_designator_member($1); 1669 } 1670 ; 1671 1672 begin_designation: /* lint-specific helper */ 1673 /* empty */ { 1674 begin_designation(); 1675 } 1676 ; 1677 1678 designator_list: /* C99 6.7.8 "Initialization" */ 1679 designator 1680 | designator_list designator 1681 ; 1682 1683 designator: /* C99 6.7.8 "Initialization" */ 1684 T_LBRACK range T_RBRACK { 1685 if (!allow_c99) 1686 /* array initializer with designators is a C99 ... */ 1687 warning(321); 1688 add_designator_subscript($2); 1689 } 1690 | T_POINT identifier { 1691 if (!allow_c99) 1692 /* struct or union member name in initializer is ... */ 1693 warning(313); 1694 add_designator_member($2); 1695 } 1696 ; 1697 1698 static_assert_declaration: 1699 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1700 T_RPAREN T_SEMI { 1701 /* '_Static_assert' requires C11 or later */ 1702 c11ism(354); 1703 } 1704 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1705 /* '_Static_assert' without message requires C23 or later */ 1706 c23ism(355); 1707 } 1708 ; 1709 1710 range: 1711 constant_expression { 1712 $$.lo = to_int_constant($1, true); 1713 $$.hi = $$.lo; 1714 } 1715 | constant_expression T_ELLIPSIS constant_expression { 1716 $$.lo = to_int_constant($1, true); 1717 $$.hi = to_int_constant($3, true); 1718 /* initialization with '[a...b]' is a GCC extension */ 1719 gnuism(340); 1720 } 1721 ; 1722 1723 init_lbrace: /* helper */ 1724 T_LBRACE { 1725 init_lbrace(); 1726 } 1727 ; 1728 1729 init_rbrace: /* helper */ 1730 T_RBRACE { 1731 init_rbrace(); 1732 } 1733 ; 1734 1735 asm_or_symbolrename_opt: /* GCC extensions */ 1736 /* empty */ { 1737 $$ = NULL; 1738 } 1739 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1740 freeyyv(&$3, T_STRING); 1741 $$ = NULL; 1742 } 1743 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1744 gcc_attribute_specifier_list_opt { 1745 $$ = $3; 1746 } 1747 ; 1748 1749 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1750 statement: 1751 expression_statement 1752 | non_expr_statement 1753 ; 1754 1755 non_expr_statement: /* helper for C99 6.8 */ 1756 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1757 | labeled_statement 1758 | compound_statement 1759 | selection_statement 1760 | iteration_statement 1761 | jump_statement { 1762 suppress_fallthrough = false; 1763 } 1764 | asm_statement 1765 ; 1766 1767 labeled_statement: /* C99 6.8.1 */ 1768 label gcc_attribute_specifier_list_opt statement 1769 ; 1770 1771 label: 1772 T_NAME T_COLON { 1773 set_symtyp(FLABEL); 1774 named_label(getsym($1)); 1775 } 1776 | T_CASE constant_expression T_COLON { 1777 case_label($2); 1778 suppress_fallthrough = true; 1779 } 1780 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1781 /* XXX: We don't fill all cases */ 1782 case_label($2); 1783 suppress_fallthrough = true; 1784 } 1785 | T_DEFAULT T_COLON { 1786 default_label(); 1787 suppress_fallthrough = true; 1788 } 1789 ; 1790 1791 compound_statement: /* C99 6.8.2 */ 1792 compound_statement_lbrace compound_statement_rbrace 1793 | compound_statement_lbrace block_item_list compound_statement_rbrace 1794 ; 1795 1796 compound_statement_lbrace: 1797 T_LBRACE { 1798 block_level++; 1799 mem_block_level++; 1800 debug_step("%s: mem_block_level = %zu", 1801 "compound_statement_lbrace", mem_block_level); 1802 begin_declaration_level(DLK_AUTO); 1803 } 1804 ; 1805 1806 compound_statement_rbrace: 1807 T_RBRACE { 1808 end_declaration_level(); 1809 if (!in_statement_expr()) 1810 level_free_all(mem_block_level); /* leak */ 1811 mem_block_level--; 1812 debug_step("%s: mem_block_level = %zu", 1813 "compound_statement_rbrace", mem_block_level); 1814 block_level--; 1815 suppress_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 suppress_fallthrough = false; 1844 } 1845 | T_SEMI { 1846 check_statement_reachable(); 1847 suppress_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 suppress_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_PARAMS); 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_parameters(); 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 parameter 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 parameter 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 suppress_fallthrough = true; 2209 } 2210 | T_NAME T_LPAREN T_RPAREN 2211 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2212 | type_qualifier { 2213 if (!$1.tq_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 return val.y_inc ? "++" : "--"; 2250 case T_MULTIPLICATIVE: 2251 case T_ADDITIVE: 2252 case T_SHIFT: 2253 case T_RELATIONAL: 2254 case T_EQUALITY: 2255 case T_OPASSIGN: 2256 return op_name(val.y_op); 2257 case T_SCLASS: 2258 return scl_name(val.y_scl); 2259 case T_TYPE: 2260 case T_STRUCT_OR_UNION: 2261 return tspec_name(val.y_tspec); 2262 case T_QUAL: 2263 return type_qualifiers_string(val.y_type_qualifiers); 2264 case T_FUNCTION_SPECIFIER: 2265 return function_specifier_name(val.y_function_specifier); 2266 case T_NAME: 2267 return val.y_name->sb_name; 2268 default: 2269 return "<none>"; 2270 } 2271 } 2272 #endif 2273 2274 static void 2275 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2276 { 2277 declare(decl, has_initializer, renaming); 2278 if (renaming != NULL) 2279 freeyyv(&renaming, T_NAME); 2280 } 2281 2282 /* 2283 * Discard all input tokens up to and including the next unmatched right 2284 * parenthesis. 2285 */ 2286 static void 2287 read_until_rparen(void) 2288 { 2289 int level; 2290 2291 if (yychar < 0) 2292 yychar = yylex(); 2293 freeyyv(&yylval, yychar); 2294 2295 level = 1; 2296 while (yychar > 0) { 2297 if (yychar == T_LPAREN) 2298 level++; 2299 if (yychar == T_RPAREN && --level == 0) 2300 break; 2301 freeyyv(&yylval, yychar = yylex()); 2302 } 2303 2304 yyclearin; 2305 } 2306 2307 static sym_t * 2308 symbolrename(sym_t *s, sbuf_t *sb) 2309 { 2310 if (sb != NULL) 2311 s->s_rename = sb->sb_name; 2312 return s; 2313 } 2314
Indexes created Thu Oct 02 14:10:14 GMT 2025