cgram.y revision 1.455
1 %{ 2 /* $NetBSD: cgram.y,v 1.455 2023/07/12 13:00:09 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 1.455 2023/07/12 13:00:09 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 arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 /* 89 * There used to be an assertion that saved_lwarn is 90 * LWARN_NOTHING_SAVED here, but that triggered for the following 91 * code: 92 * 93 * void function(int x) { if (x > 0) if (x > 1) return; } 94 * 95 * It didn't trigger if the inner 'if' was enclosed in braces though. 96 * 97 * TODO: If actually needed, add support for nested suppression of 98 * warnings. 99 */ 100 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 101 saved_lwarn = lwarn; 102 } 103 104 /* ARGSUSED */ 105 static void 106 restore_warning_flags_loc(const char *file, size_t line) 107 { 108 if (saved_lwarn != LWARN_NOTHING_SAVED) { 109 lwarn = saved_lwarn; 110 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 111 /* 112 * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to 113 * avoid triggering the assertion in save_warning_flags_loc. 114 */ 115 } else 116 clear_warning_flags_loc(file, line); 117 } 118 119 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 120 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 121 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 122 123 static bool 124 is_either(const char *s, const char *a, const char *b) 125 { 126 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 127 } 128 129 #if YYDEBUG && YYBYACC 130 #define YYSTYPE_TOSTRING cgram_to_string 131 #endif 132 133 %} 134 135 %expect 131 136 137 %union { 138 val_t *y_val; 139 sbuf_t *y_name; 140 sym_t *y_sym; 141 op_t y_op; 142 scl_t y_scl; 143 tspec_t y_tspec; 144 tqual_t y_tqual; 145 type_t *y_type; 146 tnode_t *y_tnode; 147 range_t y_range; 148 strg_t *y_string; 149 qual_ptr *y_qual_ptr; 150 bool y_seen_statement; 151 struct generic_association *y_generic; 152 struct array_size y_array_size; 153 bool y_in_system_header; 154 }; 155 156 /* for Bison: 157 %printer { 158 if (is_integer($$->v_tspec)) 159 fprintf(yyo, "%lld", (unsigned long long)$$->u.integer); 160 else 161 fprintf(yyo, "%Lg", $$->u.floating); 162 } <y_val> 163 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 164 %printer { debug_sym("", $$, ""); } <y_sym> 165 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 166 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 167 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 168 %printer { fprintf(yyo, "%s", tqual_name($$)); } <y_tqual> 169 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 170 %printer { 171 if ($$ == NULL) 172 fprintf(yyo, "<null>"); 173 else 174 fprintf(yyo, "%s '%s'", 175 op_name($$->tn_op), type_name($$->tn_type)); 176 } <y_tnode> 177 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 178 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 179 %printer { 180 fprintf(yyo, "%s%s%s", 181 $$->p_const ? "const " : "", 182 $$->p_volatile ? "volatile " : "", 183 $$->p_pointer ? "*" : ""); 184 } <y_qual_ptr> 185 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 186 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 187 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 188 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 189 */ 190 191 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 192 %token T_POINT T_ARROW 193 %token T_COMPLEMENT T_LOGNOT 194 %token <y_op> T_INCDEC 195 %token T_SIZEOF 196 %token T_BUILTIN_OFFSETOF 197 %token T_TYPEOF 198 %token T_EXTENSION 199 %token T_ALIGNAS 200 %token T_ALIGNOF 201 %token T_ASTERISK 202 %token <y_op> T_MULTIPLICATIVE 203 %token <y_op> T_ADDITIVE 204 %token <y_op> T_SHIFT 205 %token <y_op> T_RELATIONAL 206 %token <y_op> T_EQUALITY 207 %token T_AMPER 208 %token T_BITXOR 209 %token T_BITOR 210 %token T_LOGAND 211 %token T_LOGOR 212 %token T_QUEST 213 %token T_COLON 214 %token T_ASSIGN 215 %token <y_op> T_OPASSIGN 216 %token T_COMMA 217 %token T_SEMI 218 %token T_ELLIPSIS 219 %token T_REAL 220 %token T_IMAG 221 %token T_GENERIC 222 %token T_NORETURN 223 224 /* storage classes (extern, static, auto, register and typedef) */ 225 %token <y_scl> T_SCLASS 226 227 /* 228 * predefined type keywords (char, int, short, long, unsigned, signed, 229 * float, double, void); see T_TYPENAME for types from typedef 230 */ 231 %token <y_tspec> T_TYPE 232 233 /* qualifiers (const, volatile, restrict, _Thread_local) */ 234 %token <y_tqual> T_QUAL 235 %token <y_tqual> T_ATOMIC 236 237 /* struct or union */ 238 %token <y_tspec> T_STRUCT_OR_UNION 239 240 /* remaining keywords */ 241 %token T_ASM 242 %token T_BREAK 243 %token T_CASE 244 %token T_CONTINUE 245 %token T_DEFAULT 246 %token T_DO 247 %token T_ELSE 248 %token T_ENUM 249 %token T_FOR 250 %token T_GOTO 251 %token T_IF 252 %token T_PACKED 253 %token T_RETURN 254 %token T_SWITCH 255 %token T_SYMBOLRENAME 256 %token T_WHILE 257 %token T_STATIC_ASSERT 258 259 %token T_ATTRIBUTE 260 261 %left T_THEN 262 %left T_ELSE 263 %right T_QUEST T_COLON 264 %left T_LOGOR 265 %left T_LOGAND 266 %left T_BITOR 267 %left T_BITXOR 268 %left T_AMPER 269 %left T_EQUALITY 270 %left T_RELATIONAL 271 %left T_SHIFT 272 %left T_ADDITIVE 273 %left T_ASTERISK T_MULTIPLICATIVE 274 275 %token <y_name> T_NAME 276 %token <y_name> T_TYPENAME 277 %token <y_val> T_CON 278 %token <y_string> T_STRING 279 280 /* No type for program. */ 281 %type <y_sym> identifier_sym 282 %type <y_name> identifier 283 %type <y_string> string 284 %type <y_tnode> primary_expression 285 %type <y_tnode> generic_selection 286 %type <y_generic> generic_assoc_list 287 %type <y_generic> generic_association 288 %type <y_tnode> postfix_expression 289 /* No type for comma_opt. */ 290 %type <y_tnode> gcc_statement_expr_list 291 %type <y_tnode> gcc_statement_expr_item 292 %type <y_op> point_or_arrow 293 %type <y_tnode> argument_expression_list 294 %type <y_tnode> unary_expression 295 %type <y_tnode> cast_expression 296 %type <y_tnode> expression_opt 297 %type <y_tnode> conditional_expression 298 %type <y_tnode> assignment_expression 299 %type <y_tnode> expression 300 %type <y_tnode> constant_expression 301 /* No type for declaration_or_error. */ 302 /* No type for declaration. */ 303 /* No type for begin_type_declaration_specifiers. */ 304 /* No type for begin_type_declmods. */ 305 /* No type for begin_type_specifier_qualifier_list. */ 306 /* No type for begin_type_specifier_qualifier_list_postfix. */ 307 %type <y_type> begin_type_typespec 308 /* No type for begin_type_qualifier_list. */ 309 /* No type for declmod. */ 310 /* No type for type_attribute_list_opt. */ 311 /* No type for type_attribute_list. */ 312 /* No type for type_attribute_opt. */ 313 /* No type for type_attribute. */ 314 /* No type for begin_type. */ 315 /* No type for end_type. */ 316 %type <y_type> type_specifier 317 %type <y_type> notype_type_specifier 318 %type <y_type> atomic_type_specifier 319 %type <y_type> struct_or_union_specifier 320 %type <y_tspec> struct_or_union 321 %type <y_sym> braced_member_declaration_list 322 /* No type for member_declaration_lbrace. */ 323 %type <y_sym> member_declaration_list_with_rbrace 324 %type <y_sym> member_declaration_list 325 %type <y_sym> member_declaration 326 %type <y_sym> notype_member_declarators 327 %type <y_sym> type_member_declarators 328 %type <y_sym> notype_member_declarator 329 %type <y_sym> type_member_declarator 330 %type <y_type> enum_specifier 331 /* No type for enum. */ 332 %type <y_sym> enum_declaration 333 /* No type for enum_decl_lbrace. */ 334 %type <y_sym> enums_with_opt_comma 335 %type <y_sym> enumerator_list 336 %type <y_sym> enumerator 337 %type <y_tqual> type_qualifier 338 /* No type for atomic. */ 339 %type <y_qual_ptr> pointer 340 %type <y_qual_ptr> asterisk 341 %type <y_qual_ptr> type_qualifier_list_opt 342 %type <y_qual_ptr> type_qualifier_list 343 %type <y_qual_ptr> type_qualifier_list_elem 344 /* No type for notype_init_declarators. */ 345 /* No type for type_init_declarators. */ 346 /* No type for notype_init_declarator. */ 347 /* No type for type_init_declarator. */ 348 %type <y_sym> notype_declarator 349 %type <y_sym> type_declarator 350 %type <y_sym> notype_direct_declarator 351 %type <y_sym> type_direct_declarator 352 %type <y_sym> type_param_declarator 353 %type <y_sym> notype_param_declarator 354 %type <y_sym> direct_param_declarator 355 %type <y_sym> direct_notype_param_declarator 356 %type <y_sym> param_list 357 /* No type for id_list_lparen. */ 358 /* No type for abstract_decl_lparen. */ 359 %type <y_array_size> array_size_opt 360 %type <y_tnode> array_size 361 %type <y_sym> identifier_list 362 %type <y_type> type_name 363 %type <y_sym> abstract_declaration 364 %type <y_sym> abstract_declarator 365 %type <y_sym> direct_abstract_declarator 366 %type <y_sym> abstract_decl_param_list 367 /* No type for abstract_decl_lparen. */ 368 %type <y_sym> vararg_parameter_type_list 369 %type <y_sym> parameter_type_list 370 %type <y_sym> parameter_declaration 371 /* No type for braced_initializer. */ 372 /* No type for initializer. */ 373 /* No type for initializer_list. */ 374 /* No type for initializer_list_item. */ 375 /* No type for designation. */ 376 /* No type for begin_designation. */ 377 /* No type for designator_list. */ 378 /* No type for designator. */ 379 /* No type for static_assert_declaration. */ 380 %type <y_range> range 381 /* No type for init_lbrace. */ 382 /* No type for init_rbrace. */ 383 %type <y_name> asm_or_symbolrename_opt 384 /* No type for statement. */ 385 /* No type for non_expr_statement. */ 386 /* No type for labeled_statement. */ 387 /* No type for label. */ 388 /* No type for compound_statement. */ 389 /* No type for compound_statement_lbrace. */ 390 /* No type for compound_statement_rbrace. */ 391 %type <y_seen_statement> block_item_list 392 %type <y_seen_statement> block_item 393 /* No type for expression_statement. */ 394 /* No type for selection_statement. */ 395 /* No type for if_without_else. */ 396 /* No type for if_expr. */ 397 /* No type for switch_expr. */ 398 /* No type for iteration_statement. */ 399 /* No type for while_expr. */ 400 /* No type for do_statement. */ 401 /* No type for do. */ 402 %type <y_tnode> do_while_expr 403 /* No type for for_start. */ 404 /* No type for for_exprs. */ 405 /* No type for jump_statement. */ 406 /* No type for goto. */ 407 /* No type for asm_statement. */ 408 /* No type for read_until_rparen. */ 409 /* No type for translation_unit. */ 410 /* No type for external_declaration. */ 411 /* No type for top_level_declaration. */ 412 /* No type for function_definition. */ 413 %type <y_sym> func_declarator 414 /* No type for arg_declaration_list_opt. */ 415 /* No type for arg_declaration_list. */ 416 /* No type for arg_declaration. */ 417 /* No type for gcc_attribute_specifier_list_opt. */ 418 /* No type for gcc_attribute_specifier_list. */ 419 /* No type for gcc_attribute_specifier. */ 420 /* No type for gcc_attribute_list. */ 421 /* No type for gcc_attribute. */ 422 /* No type for gcc_attribute_parameters. */ 423 %type <y_in_system_header> sys 424 425 %% 426 427 program: 428 /* empty */ { 429 /* TODO: Make this an error in C99 mode as well. */ 430 if (!allow_trad && !allow_c99) { 431 /* empty translation unit */ 432 error(272); 433 } else if (allow_c90) { 434 /* empty translation unit */ 435 warning(272); 436 } 437 } 438 | translation_unit 439 ; 440 441 identifier_sym: /* helper for struct/union/enum */ 442 identifier { 443 $$ = getsym($1); 444 } 445 ; 446 447 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 448 identifier: 449 T_NAME { 450 debug_step("cgram: name '%s'", $1->sb_name); 451 $$ = $1; 452 } 453 | T_TYPENAME { 454 debug_step("cgram: typename '%s'", $1->sb_name); 455 $$ = $1; 456 } 457 ; 458 459 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 460 string: 461 T_STRING 462 | string T_STRING { 463 if (!allow_c90) { 464 /* concatenated strings are illegal in traditional C */ 465 warning(219); 466 } 467 $$ = cat_strings($1, $2); 468 } 469 ; 470 471 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 472 primary_expression: 473 T_NAME { 474 bool sys_name, sys_next; 475 sys_name = in_system_header; 476 if (yychar < 0) 477 yychar = yylex(); 478 sys_next = in_system_header; 479 in_system_header = sys_name; 480 $$ = build_name(getsym($1), yychar == T_LPAREN); 481 in_system_header = sys_next; 482 } 483 | T_CON { 484 $$ = build_constant(gettyp($1->v_tspec), $1); 485 } 486 | string { 487 $$ = build_string($1); 488 } 489 | T_LPAREN expression T_RPAREN { 490 if ($2 != NULL) 491 $2->tn_parenthesized = true; 492 $$ = $2; 493 } 494 | generic_selection 495 /* GCC primary-expression, see c_parser_postfix_expression */ 496 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 497 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 498 set_symtyp(FMEMBER); 499 $$ = build_offsetof($3, getsym($5)); 500 } 501 ; 502 503 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 504 generic_selection: 505 T_GENERIC T_LPAREN assignment_expression T_COMMA 506 generic_assoc_list T_RPAREN { 507 /* generic selection requires C11 or later */ 508 c11ism(345); 509 $$ = build_generic_selection($3, $5); 510 } 511 ; 512 513 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 514 generic_assoc_list: 515 generic_association 516 | generic_assoc_list T_COMMA generic_association { 517 $3->ga_prev = $1; 518 $$ = $3; 519 } 520 ; 521 522 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 523 generic_association: 524 type_name T_COLON assignment_expression { 525 $$ = block_zero_alloc(sizeof(*$$)); 526 $$->ga_arg = $1; 527 $$->ga_result = $3; 528 } 529 | T_DEFAULT T_COLON assignment_expression { 530 $$ = block_zero_alloc(sizeof(*$$)); 531 $$->ga_arg = NULL; 532 $$->ga_result = $3; 533 } 534 ; 535 536 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 537 postfix_expression: 538 primary_expression 539 | postfix_expression T_LBRACK sys expression T_RBRACK { 540 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 541 } 542 | postfix_expression T_LPAREN sys T_RPAREN { 543 $$ = build_function_call($1, $3, NULL); 544 } 545 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 546 $$ = build_function_call($1, $3, $4); 547 } 548 | postfix_expression point_or_arrow sys T_NAME { 549 $$ = build_member_access($1, $2, $3, $4); 550 } 551 | postfix_expression T_INCDEC sys { 552 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 553 } 554 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 555 sym_t *tmp = mktempsym($2); 556 begin_initialization(tmp); 557 cgram_declare(tmp, true, NULL); 558 } braced_initializer { 559 if (!allow_c99) 560 /* compound literals are a C99/GCC extension */ 561 gnuism(319); 562 $$ = build_name(current_initsym(), false); 563 end_initialization(); 564 } 565 | T_LPAREN compound_statement_lbrace { 566 begin_statement_expr(); 567 } gcc_statement_expr_list { 568 do_statement_expr($4); 569 } compound_statement_rbrace T_RPAREN { 570 $$ = end_statement_expr(); 571 } 572 ; 573 574 comma_opt: /* helper for 'postfix_expression' */ 575 /* empty */ 576 | T_COMMA 577 ; 578 579 /* 580 * The inner part of a GCC statement-expression of the form ({ ... }). 581 * 582 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 583 */ 584 gcc_statement_expr_list: 585 gcc_statement_expr_item 586 | gcc_statement_expr_list gcc_statement_expr_item { 587 $$ = $2; 588 } 589 ; 590 591 gcc_statement_expr_item: 592 declaration_or_error { 593 clear_warning_flags(); 594 $$ = NULL; 595 } 596 | non_expr_statement { 597 $$ = expr_alloc_tnode(); 598 $$->tn_type = gettyp(VOID); 599 } 600 | T_SEMI { 601 $$ = expr_alloc_tnode(); 602 $$->tn_type = gettyp(VOID); 603 } 604 | expression T_SEMI { 605 if ($1 == NULL) { /* in case of syntax errors */ 606 $$ = expr_alloc_tnode(); 607 $$->tn_type = gettyp(VOID); 608 } else { 609 /* XXX: do that only on the last name */ 610 if ($1->tn_op == NAME) 611 $1->tn_sym->s_used = true; 612 expr($1, false, false, false, false); 613 seen_fallthrough = false; 614 $$ = $1; 615 } 616 } 617 ; 618 619 point_or_arrow: /* helper for 'postfix_expression' */ 620 T_POINT { 621 set_symtyp(FMEMBER); 622 $$ = POINT; 623 } 624 | T_ARROW { 625 set_symtyp(FMEMBER); 626 $$ = ARROW; 627 } 628 ; 629 630 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 631 argument_expression_list: 632 assignment_expression { 633 $$ = build_function_argument(NULL, $1); 634 } 635 | argument_expression_list T_COMMA assignment_expression { 636 $$ = build_function_argument($1, $3); 637 } 638 ; 639 640 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 641 unary_expression: 642 postfix_expression 643 | T_INCDEC sys unary_expression { 644 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 645 } 646 | T_AMPER sys cast_expression { 647 $$ = build_unary(ADDR, $2, $3); 648 } 649 | T_ASTERISK sys cast_expression { 650 $$ = build_unary(INDIR, $2, $3); 651 } 652 | T_ADDITIVE sys cast_expression { 653 if (!allow_c90 && $1 == PLUS) { 654 /* unary '+' is illegal in traditional C */ 655 warning(100); 656 } 657 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 658 } 659 | T_COMPLEMENT sys cast_expression { 660 $$ = build_unary(COMPL, $2, $3); 661 } 662 | T_LOGNOT sys cast_expression { 663 $$ = build_unary(NOT, $2, $3); 664 } 665 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 666 $$ = build_unary(REAL, $2, $3); 667 } 668 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 669 $$ = build_unary(IMAG, $2, $3); 670 } 671 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 672 $$ = $2; 673 } 674 | T_SIZEOF unary_expression { 675 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 676 if ($$ != NULL) 677 check_expr_misc($2, 678 false, false, false, false, false, true); 679 } 680 | T_SIZEOF T_LPAREN type_name T_RPAREN { 681 $$ = build_sizeof($3); 682 } 683 | T_ALIGNOF unary_expression { 684 /* non type argument to alignof is a GCC extension */ 685 gnuism(349); 686 lint_assert($2 != NULL); 687 $$ = build_alignof($2->tn_type); 688 } 689 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 690 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 691 /* TODO: c11ism */ 692 $$ = build_alignof($3); 693 } 694 ; 695 696 /* The rule 'unary_operator' is inlined into unary_expression. */ 697 698 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 699 cast_expression: 700 unary_expression 701 | T_LPAREN type_name T_RPAREN cast_expression { 702 $$ = cast($4, $2); 703 } 704 ; 705 706 expression_opt: 707 /* empty */ { 708 $$ = NULL; 709 } 710 | expression 711 ; 712 713 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 714 /* 'conditional_expression' also implements 'additive_expression'. */ 715 /* 'conditional_expression' also implements 'shift_expression'. */ 716 /* 'conditional_expression' also implements 'relational_expression'. */ 717 /* 'conditional_expression' also implements 'equality_expression'. */ 718 /* 'conditional_expression' also implements 'AND_expression'. */ 719 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 720 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 721 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 722 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 723 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 724 conditional_expression: 725 cast_expression 726 | conditional_expression T_ASTERISK sys conditional_expression { 727 $$ = build_binary($1, MULT, $3, $4); 728 } 729 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 730 $$ = build_binary($1, $2, $3, $4); 731 } 732 | conditional_expression T_ADDITIVE sys conditional_expression { 733 $$ = build_binary($1, $2, $3, $4); 734 } 735 | conditional_expression T_SHIFT sys conditional_expression { 736 $$ = build_binary($1, $2, $3, $4); 737 } 738 | conditional_expression T_RELATIONAL sys conditional_expression { 739 $$ = build_binary($1, $2, $3, $4); 740 } 741 | conditional_expression T_EQUALITY sys conditional_expression { 742 $$ = build_binary($1, $2, $3, $4); 743 } 744 | conditional_expression T_AMPER sys conditional_expression { 745 $$ = build_binary($1, BITAND, $3, $4); 746 } 747 | conditional_expression T_BITXOR sys conditional_expression { 748 $$ = build_binary($1, BITXOR, $3, $4); 749 } 750 | conditional_expression T_BITOR sys conditional_expression { 751 $$ = build_binary($1, BITOR, $3, $4); 752 } 753 | conditional_expression T_LOGAND sys conditional_expression { 754 $$ = build_binary($1, LOGAND, $3, $4); 755 } 756 | conditional_expression T_LOGOR sys conditional_expression { 757 $$ = build_binary($1, LOGOR, $3, $4); 758 } 759 | conditional_expression T_QUEST sys 760 expression T_COLON sys conditional_expression { 761 $$ = build_binary($1, QUEST, $3, 762 build_binary($4, COLON, $6, $7)); 763 } 764 ; 765 766 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 767 assignment_expression: 768 conditional_expression 769 | unary_expression T_ASSIGN sys assignment_expression { 770 $$ = build_binary($1, ASSIGN, $3, $4); 771 } 772 | unary_expression T_OPASSIGN sys assignment_expression { 773 $$ = build_binary($1, $2, $3, $4); 774 } 775 ; 776 777 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 778 expression: 779 assignment_expression 780 | expression T_COMMA sys assignment_expression { 781 $$ = build_binary($1, COMMA, $3, $4); 782 } 783 ; 784 785 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 786 constant_expression: 787 conditional_expression 788 ; 789 790 declaration_or_error: 791 declaration 792 | error T_SEMI 793 ; 794 795 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 796 declaration: 797 begin_type_declmods end_type T_SEMI { 798 if (dcs->d_scl == TYPEDEF) { 799 /* typedef declares no type name */ 800 warning(72); 801 } else { 802 /* empty declaration */ 803 warning(2); 804 } 805 } 806 | begin_type_declmods end_type notype_init_declarators T_SEMI { 807 if (dcs->d_scl == TYPEDEF) { 808 /* syntax error '%s' */ 809 error(249, "missing base type for typedef"); 810 } else { 811 /* old-style declaration; add 'int' */ 812 error(1); 813 } 814 } 815 | begin_type_declaration_specifiers end_type T_SEMI { 816 if (dcs->d_scl == TYPEDEF) { 817 /* typedef declares no type name */ 818 warning(72); 819 } else if (!dcs->d_nonempty_decl) { 820 /* empty declaration */ 821 warning(2); 822 } 823 } 824 | begin_type_declaration_specifiers end_type 825 type_init_declarators T_SEMI 826 | static_assert_declaration 827 ; 828 829 begin_type_declaration_specifiers: /* see C99 6.7 */ 830 begin_type_typespec { 831 dcs_add_type($1); 832 } 833 | begin_type_declmods type_specifier { 834 dcs_add_type($2); 835 } 836 | type_attribute begin_type_declaration_specifiers 837 | begin_type_declaration_specifiers declmod 838 | begin_type_declaration_specifiers notype_type_specifier { 839 dcs_add_type($2); 840 } 841 ; 842 843 begin_type_declmods: /* see C99 6.7 */ 844 begin_type type_qualifier { 845 dcs_add_qualifier($2); 846 } 847 | begin_type T_SCLASS { 848 dcs_add_storage_class($2); 849 } 850 | begin_type_declmods declmod 851 ; 852 853 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 854 begin_type_specifier_qualifier_list_postfix 855 | type_attribute_list begin_type_specifier_qualifier_list_postfix 856 ; 857 858 begin_type_specifier_qualifier_list_postfix: 859 begin_type_typespec { 860 dcs_add_type($1); 861 } 862 | begin_type_qualifier_list type_specifier { 863 dcs_add_type($2); 864 } 865 | begin_type_specifier_qualifier_list_postfix type_qualifier { 866 dcs_add_qualifier($2); 867 } 868 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 869 dcs_add_type($2); 870 } 871 | begin_type_specifier_qualifier_list_postfix type_attribute 872 ; 873 874 begin_type_typespec: 875 begin_type notype_type_specifier { 876 $$ = $2; 877 } 878 | begin_type T_TYPENAME { 879 $$ = getsym($2)->s_type; 880 } 881 ; 882 883 begin_type_qualifier_list: 884 begin_type type_qualifier { 885 dcs_add_qualifier($2); 886 } 887 | begin_type_qualifier_list type_qualifier { 888 dcs_add_qualifier($2); 889 } 890 ; 891 892 declmod: 893 type_qualifier { 894 dcs_add_qualifier($1); 895 } 896 | T_SCLASS { 897 dcs_add_storage_class($1); 898 } 899 | type_attribute_list 900 ; 901 902 type_attribute_list_opt: 903 /* empty */ 904 | type_attribute_list 905 ; 906 907 type_attribute_list: 908 type_attribute 909 | type_attribute_list type_attribute 910 ; 911 912 type_attribute_opt: 913 /* empty */ 914 | type_attribute 915 ; 916 917 type_attribute: /* See C11 6.7 declaration-specifiers */ 918 gcc_attribute_specifier 919 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 920 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 921 | T_PACKED { 922 dcs_add_packed(); 923 } 924 | T_NORETURN 925 ; 926 927 begin_type: 928 /* empty */ { 929 dcs_begin_type(); 930 } 931 ; 932 933 end_type: 934 /* empty */ { 935 dcs_end_type(); 936 } 937 ; 938 939 type_specifier: /* C99 6.7.2 */ 940 notype_type_specifier 941 | T_TYPENAME { 942 $$ = getsym($1)->s_type; 943 } 944 ; 945 946 notype_type_specifier: /* see C99 6.7.2 */ 947 T_TYPE { 948 $$ = gettyp($1); 949 } 950 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 951 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 952 $$->t_typeof = true; 953 } 954 | atomic_type_specifier 955 | struct_or_union_specifier { 956 end_declaration_level(); 957 $$ = $1; 958 } 959 | enum_specifier { 960 end_declaration_level(); 961 $$ = $1; 962 } 963 ; 964 965 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 966 atomic_type_specifier: 967 atomic T_LPAREN type_name T_RPAREN { 968 $$ = $3; 969 } 970 ; 971 972 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 973 struct_or_union_specifier: 974 struct_or_union identifier_sym { 975 /* 976 * STDC requires that "struct a;" always introduces 977 * a new tag if "a" is not declared at current level 978 * 979 * yychar is valid because otherwise the parser would not 980 * have been able to decide if it must shift or reduce 981 */ 982 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 983 } 984 | struct_or_union identifier_sym { 985 dcs->d_tag_type = make_tag_type($2, $1, true, false); 986 } braced_member_declaration_list { 987 $$ = complete_struct_or_union($4); 988 } 989 | struct_or_union { 990 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 991 } braced_member_declaration_list { 992 $$ = complete_struct_or_union($3); 993 } 994 | struct_or_union error { 995 set_symtyp(FVFT); 996 $$ = gettyp(INT); 997 } 998 ; 999 1000 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1001 struct_or_union: 1002 T_STRUCT_OR_UNION { 1003 set_symtyp(FTAG); 1004 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1005 dcs->d_sou_size_in_bits = 0; 1006 dcs->d_sou_align_in_bits = CHAR_SIZE; 1007 $$ = $1; 1008 } 1009 | struct_or_union type_attribute 1010 ; 1011 1012 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1013 member_declaration_lbrace member_declaration_list_with_rbrace { 1014 $$ = $2; 1015 } 1016 ; 1017 1018 member_declaration_lbrace: /* see C99 6.7.2.1 */ 1019 T_LBRACE { 1020 set_symtyp(FVFT); 1021 } 1022 ; 1023 1024 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1025 member_declaration_list T_RBRACE 1026 | T_RBRACE { 1027 /* XXX: This is not allowed by any C standard. */ 1028 $$ = NULL; 1029 } 1030 ; 1031 1032 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1033 /* Was named struct_declaration_list until C11. */ 1034 member_declaration_list: 1035 member_declaration 1036 | member_declaration_list member_declaration { 1037 $$ = concat_symbols($1, $2); 1038 } 1039 ; 1040 1041 /* Was named struct_declaration until C11. */ 1042 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1043 member_declaration: 1044 begin_type_qualifier_list end_type { 1045 /* ^^ There is no check for the missing type-specifier. */ 1046 /* too late, i know, but getsym() compensates it */ 1047 set_symtyp(FMEMBER); 1048 } notype_member_declarators type_attribute_opt T_SEMI { 1049 set_symtyp(FVFT); 1050 $$ = $4; 1051 } 1052 | begin_type_specifier_qualifier_list end_type { 1053 set_symtyp(FMEMBER); 1054 } type_member_declarators type_attribute_opt T_SEMI { 1055 set_symtyp(FVFT); 1056 $$ = $4; 1057 } 1058 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1059 /* syntax error '%s' */ 1060 error(249, "member without type"); 1061 $$ = NULL; 1062 } 1063 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1064 T_SEMI { 1065 set_symtyp(FVFT); 1066 if (!allow_c11 && !allow_gcc) 1067 /* anonymous struct/union members is a C11 feature */ 1068 warning(49); 1069 if (is_struct_or_union(dcs->d_type->t_tspec)) 1070 $$ = declare_unnamed_member(); 1071 else { 1072 /* syntax error '%s' */ 1073 error(249, "unnamed member"); 1074 $$ = NULL; 1075 } 1076 } 1077 | static_assert_declaration { 1078 $$ = NULL; 1079 } 1080 | error T_SEMI { 1081 set_symtyp(FVFT); 1082 $$ = NULL; 1083 } 1084 ; 1085 1086 /* Was named struct_declarators until C11. */ 1087 notype_member_declarators: 1088 notype_member_declarator { 1089 $$ = declare_member($1); 1090 } 1091 | notype_member_declarators { 1092 set_symtyp(FMEMBER); 1093 } T_COMMA type_member_declarator { 1094 $$ = concat_symbols($1, declare_member($4)); 1095 } 1096 ; 1097 1098 /* Was named struct_declarators until C11. */ 1099 type_member_declarators: 1100 type_member_declarator { 1101 $$ = declare_member($1); 1102 } 1103 | type_member_declarators { 1104 set_symtyp(FMEMBER); 1105 } T_COMMA type_member_declarator { 1106 $$ = concat_symbols($1, declare_member($4)); 1107 } 1108 ; 1109 1110 /* Was named struct_declarator until C11. */ 1111 notype_member_declarator: 1112 notype_declarator 1113 /* C99 6.7.2.1 */ 1114 | notype_declarator T_COLON constant_expression { 1115 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1116 } 1117 /* C99 6.7.2.1 */ 1118 | { 1119 set_symtyp(FVFT); 1120 } T_COLON constant_expression { 1121 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1122 } 1123 ; 1124 1125 /* Was named struct_declarator until C11. */ 1126 type_member_declarator: 1127 type_declarator 1128 | type_declarator T_COLON constant_expression { 1129 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1130 } 1131 | { 1132 set_symtyp(FVFT); 1133 } T_COLON constant_expression { 1134 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1135 } 1136 ; 1137 1138 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1139 enum_specifier: 1140 enum gcc_attribute_specifier_list_opt identifier_sym { 1141 $$ = make_tag_type($3, ENUM, false, false); 1142 } 1143 | enum gcc_attribute_specifier_list_opt identifier_sym { 1144 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1145 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1146 $$ = complete_enum($5); 1147 } 1148 | enum gcc_attribute_specifier_list_opt { 1149 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1150 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1151 $$ = complete_enum($4); 1152 } 1153 | enum error { 1154 set_symtyp(FVFT); 1155 $$ = gettyp(INT); 1156 } 1157 ; 1158 1159 enum: /* helper for C99 6.7.2.2 */ 1160 T_ENUM { 1161 set_symtyp(FTAG); 1162 begin_declaration_level(DLK_ENUM); 1163 } 1164 ; 1165 1166 enum_declaration: /* helper for C99 6.7.2.2 */ 1167 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1168 $$ = $2; 1169 } 1170 ; 1171 1172 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1173 T_LBRACE { 1174 set_symtyp(FVFT); 1175 enumval = 0; 1176 } 1177 ; 1178 1179 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1180 enumerator_list 1181 | enumerator_list T_COMMA { 1182 if (!allow_c99 && !allow_trad) { 1183 /* trailing ',' in enum declaration requires C99 ... */ 1184 error(54); 1185 } else { 1186 /* trailing ',' in enum declaration requires C99 ... */ 1187 c99ism(54); 1188 } 1189 $$ = $1; 1190 } 1191 ; 1192 1193 enumerator_list: /* C99 6.7.2.2 */ 1194 enumerator 1195 | enumerator_list T_COMMA enumerator { 1196 $$ = concat_symbols($1, $3); 1197 } 1198 | error { 1199 $$ = NULL; 1200 } 1201 ; 1202 1203 enumerator: /* C99 6.7.2.2 */ 1204 identifier_sym gcc_attribute_specifier_list_opt { 1205 $$ = enumeration_constant($1, enumval, true); 1206 } 1207 | identifier_sym gcc_attribute_specifier_list_opt 1208 T_ASSIGN constant_expression { 1209 $$ = enumeration_constant($1, to_int_constant($4, true), 1210 false); 1211 } 1212 ; 1213 1214 type_qualifier: /* C99 6.7.3 */ 1215 T_QUAL 1216 | atomic { 1217 $$ = ATOMIC; 1218 } 1219 ; 1220 1221 atomic: /* helper */ 1222 T_ATOMIC { 1223 /* TODO: First fix c11ism, then use it here. */ 1224 if (!allow_c11) 1225 /* '_Atomic' requires C11 or later */ 1226 error(350); 1227 } 1228 ; 1229 1230 pointer: /* C99 6.7.5 */ 1231 asterisk type_qualifier_list_opt { 1232 $$ = merge_qualified_pointer($1, $2); 1233 } 1234 | asterisk type_qualifier_list_opt pointer { 1235 $$ = merge_qualified_pointer($1, $2); 1236 $$ = merge_qualified_pointer($$, $3); 1237 } 1238 ; 1239 1240 asterisk: /* helper for 'pointer' */ 1241 T_ASTERISK { 1242 $$ = xcalloc(1, sizeof(*$$)); 1243 $$->p_pointer = true; 1244 } 1245 ; 1246 1247 type_qualifier_list_opt: /* see C99 6.7.5 */ 1248 /* empty */ { 1249 $$ = NULL; 1250 } 1251 | type_qualifier_list 1252 ; 1253 1254 type_qualifier_list: /* C99 6.7.5 */ 1255 type_qualifier_list_elem 1256 | type_qualifier_list type_qualifier_list_elem { 1257 $$ = merge_qualified_pointer($1, $2); 1258 } 1259 ; 1260 1261 type_qualifier_list_elem: /* helper for 'pointer' */ 1262 type_qualifier { 1263 $$ = xcalloc(1, sizeof(*$$)); 1264 if ($1 == CONST) 1265 $$->p_const = true; 1266 if ($1 == VOLATILE) 1267 $$->p_volatile = true; 1268 } 1269 ; 1270 1271 /* 1272 * For an explanation of 'notype' in the following rules, see 1273 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1274 */ 1275 1276 notype_init_declarators: 1277 notype_init_declarator 1278 | notype_init_declarators T_COMMA type_init_declarator 1279 ; 1280 1281 type_init_declarators: 1282 type_init_declarator 1283 | type_init_declarators T_COMMA type_init_declarator 1284 ; 1285 1286 notype_init_declarator: 1287 notype_declarator asm_or_symbolrename_opt { 1288 cgram_declare($1, false, $2); 1289 check_size($1); 1290 } 1291 | notype_declarator asm_or_symbolrename_opt { 1292 begin_initialization($1); 1293 cgram_declare($1, true, $2); 1294 } T_ASSIGN initializer { 1295 check_size($1); 1296 end_initialization(); 1297 } 1298 ; 1299 1300 type_init_declarator: 1301 type_declarator asm_or_symbolrename_opt { 1302 cgram_declare($1, false, $2); 1303 check_size($1); 1304 } 1305 | type_declarator asm_or_symbolrename_opt { 1306 begin_initialization($1); 1307 cgram_declare($1, true, $2); 1308 } T_ASSIGN initializer { 1309 check_size($1); 1310 end_initialization(); 1311 } 1312 ; 1313 1314 notype_declarator: 1315 notype_direct_declarator 1316 | pointer notype_direct_declarator { 1317 $$ = add_pointer($2, $1); 1318 } 1319 ; 1320 1321 type_declarator: 1322 type_direct_declarator 1323 | pointer type_direct_declarator { 1324 $$ = add_pointer($2, $1); 1325 } 1326 ; 1327 1328 notype_direct_declarator: 1329 type_attribute_list_opt T_NAME { 1330 $$ = declarator_name(getsym($2)); 1331 } 1332 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1333 $$ = $3; 1334 } 1335 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1336 $$ = add_array($1, $3.has_dim, $3.dim); 1337 } 1338 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1339 $$ = add_function(symbolrename($1, $3), $2); 1340 end_declaration_level(); 1341 block_level--; 1342 } 1343 | notype_direct_declarator type_attribute 1344 ; 1345 1346 type_direct_declarator: 1347 type_attribute_list_opt identifier { 1348 $$ = declarator_name(getsym($2)); 1349 } 1350 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1351 $$ = $3; 1352 } 1353 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1354 $$ = add_array($1, $3.has_dim, $3.dim); 1355 } 1356 | type_direct_declarator param_list asm_or_symbolrename_opt { 1357 $$ = add_function(symbolrename($1, $3), $2); 1358 end_declaration_level(); 1359 block_level--; 1360 } 1361 | type_direct_declarator type_attribute 1362 ; 1363 1364 /* 1365 * The two distinct rules type_param_declarator and notype_param_declarator 1366 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1367 * always treated as a typename, not an argument name. For example, after 1368 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1369 * "f(int (double));", not "f(int a);". 1370 */ 1371 type_param_declarator: 1372 direct_param_declarator 1373 | pointer direct_param_declarator { 1374 $$ = add_pointer($2, $1); 1375 } 1376 ; 1377 1378 notype_param_declarator: 1379 direct_notype_param_declarator 1380 | pointer direct_notype_param_declarator { 1381 $$ = add_pointer($2, $1); 1382 } 1383 ; 1384 1385 direct_param_declarator: 1386 identifier type_attribute_list { 1387 $$ = declarator_name(getsym($1)); 1388 } 1389 | identifier { 1390 $$ = declarator_name(getsym($1)); 1391 } 1392 | T_LPAREN notype_param_declarator T_RPAREN { 1393 $$ = $2; 1394 } 1395 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1396 gcc_attribute_specifier_list_opt { 1397 $$ = add_array($1, $3.has_dim, $3.dim); 1398 } 1399 | direct_param_declarator param_list asm_or_symbolrename_opt { 1400 $$ = add_function(symbolrename($1, $3), $2); 1401 end_declaration_level(); 1402 block_level--; 1403 } 1404 ; 1405 1406 direct_notype_param_declarator: 1407 identifier { 1408 $$ = declarator_name(getsym($1)); 1409 } 1410 | T_LPAREN notype_param_declarator T_RPAREN { 1411 $$ = $2; 1412 } 1413 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1414 $$ = add_array($1, $3.has_dim, $3.dim); 1415 } 1416 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1417 $$ = add_function(symbolrename($1, $3), $2); 1418 end_declaration_level(); 1419 block_level--; 1420 } 1421 ; 1422 1423 param_list: 1424 id_list_lparen identifier_list T_RPAREN { 1425 $$ = $2; 1426 } 1427 | abstract_decl_param_list 1428 ; 1429 1430 id_list_lparen: 1431 T_LPAREN { 1432 block_level++; 1433 begin_declaration_level(DLK_PROTO_PARAMS); 1434 } 1435 ; 1436 1437 array_size_opt: 1438 /* empty */ { 1439 $$.has_dim = false; 1440 $$.dim = 0; 1441 } 1442 | T_ASTERISK { 1443 /* since C99; variable length array of unspecified size */ 1444 $$.has_dim = false; /* TODO: maybe change to true */ 1445 $$.dim = 0; /* just as a placeholder */ 1446 } 1447 | array_size { 1448 $$.has_dim = true; 1449 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1450 } 1451 ; 1452 1453 array_size: 1454 type_qualifier_list_opt T_SCLASS constant_expression { 1455 /* C11 6.7.6.3p7 */ 1456 if ($2 != STATIC) 1457 yyerror("Bad attribute"); 1458 /* static array size is a C11 extension */ 1459 c11ism(343); 1460 $$ = $3; 1461 } 1462 | type_qualifier { 1463 /* C11 6.7.6.2 */ 1464 if ($1 != RESTRICT) 1465 yyerror("Bad attribute"); 1466 $$ = NULL; 1467 } 1468 | constant_expression 1469 ; 1470 1471 identifier_list: /* C99 6.7.5 */ 1472 T_NAME { 1473 $$ = old_style_function_parameter_name(getsym($1)); 1474 } 1475 | identifier_list T_COMMA T_NAME { 1476 $$ = concat_symbols($1, 1477 old_style_function_parameter_name(getsym($3))); 1478 } 1479 | identifier_list error 1480 ; 1481 1482 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1483 type_name: /* C99 6.7.6 */ 1484 { 1485 begin_declaration_level(DLK_ABSTRACT); 1486 } abstract_declaration { 1487 end_declaration_level(); 1488 $$ = $2->s_type; 1489 } 1490 ; 1491 1492 abstract_declaration: /* specific to lint */ 1493 begin_type_qualifier_list end_type { 1494 $$ = declare_abstract_type(abstract_name()); 1495 } 1496 | begin_type_specifier_qualifier_list end_type { 1497 $$ = declare_abstract_type(abstract_name()); 1498 } 1499 | begin_type_qualifier_list end_type abstract_declarator { 1500 $$ = declare_abstract_type($3); 1501 } 1502 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1503 $$ = declare_abstract_type($3); 1504 } 1505 ; 1506 1507 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1508 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1509 abstract_declarator: 1510 pointer { 1511 $$ = add_pointer(abstract_name(), $1); 1512 } 1513 | direct_abstract_declarator 1514 | pointer direct_abstract_declarator { 1515 $$ = add_pointer($2, $1); 1516 } 1517 | type_attribute_list direct_abstract_declarator { 1518 $$ = $2; 1519 } 1520 | pointer type_attribute_list direct_abstract_declarator { 1521 $$ = add_pointer($3, $1); 1522 } 1523 ; 1524 1525 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1526 direct_abstract_declarator: 1527 /* TODO: sort rules according to C99 */ 1528 T_LPAREN abstract_declarator T_RPAREN { 1529 $$ = $2; 1530 } 1531 | T_LBRACK array_size_opt T_RBRACK { 1532 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1533 } 1534 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1535 $$ = add_array($1, $3.has_dim, $3.dim); 1536 } 1537 | abstract_decl_param_list asm_or_symbolrename_opt { 1538 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1539 end_declaration_level(); 1540 block_level--; 1541 } 1542 | direct_abstract_declarator abstract_decl_param_list 1543 asm_or_symbolrename_opt { 1544 $$ = add_function(symbolrename($1, $3), $2); 1545 end_declaration_level(); 1546 block_level--; 1547 } 1548 | direct_abstract_declarator type_attribute_list 1549 ; 1550 1551 abstract_decl_param_list: /* specific to lint */ 1552 abstract_decl_lparen T_RPAREN type_attribute_opt { 1553 $$ = NULL; 1554 } 1555 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1556 type_attribute_opt { 1557 dcs->d_prototype = true; 1558 $$ = $2; 1559 } 1560 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1561 $$ = NULL; 1562 } 1563 ; 1564 1565 abstract_decl_lparen: /* specific to lint */ 1566 T_LPAREN { 1567 block_level++; 1568 begin_declaration_level(DLK_PROTO_PARAMS); 1569 } 1570 ; 1571 1572 vararg_parameter_type_list: /* specific to lint */ 1573 parameter_type_list 1574 | parameter_type_list T_COMMA T_ELLIPSIS { 1575 dcs->d_vararg = true; 1576 $$ = $1; 1577 } 1578 | T_ELLIPSIS { 1579 /* TODO: C99 6.7.5 makes this an error as well. */ 1580 if (!allow_trad && !allow_c99) { 1581 /* ANSI C requires formal parameter before '...' */ 1582 error(84); 1583 } else if (allow_c90) { 1584 /* ANSI C requires formal parameter before '...' */ 1585 warning(84); 1586 } 1587 dcs->d_vararg = true; 1588 $$ = NULL; 1589 } 1590 ; 1591 1592 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1593 parameter_type_list: 1594 parameter_declaration 1595 | parameter_type_list T_COMMA parameter_declaration { 1596 $$ = concat_symbols($1, $3); 1597 } 1598 ; 1599 1600 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1601 parameter_declaration: 1602 begin_type_declmods end_type { 1603 /* ^^ There is no check for the missing type-specifier. */ 1604 $$ = declare_argument(abstract_name(), false); 1605 } 1606 | begin_type_declaration_specifiers end_type { 1607 $$ = declare_argument(abstract_name(), false); 1608 } 1609 | begin_type_declmods end_type notype_param_declarator { 1610 /* ^^ There is no check for the missing type-specifier. */ 1611 $$ = declare_argument($3, false); 1612 } 1613 /* 1614 * type_param_declarator is needed because of following conflict: 1615 * "typedef int a; f(int (a));" could be parsed as 1616 * "function with argument a of type int", or 1617 * "function with an abstract argument of type function". 1618 * This grammar realizes the second case. 1619 */ 1620 | begin_type_declaration_specifiers end_type type_param_declarator { 1621 $$ = declare_argument($3, false); 1622 } 1623 | begin_type_declmods end_type abstract_declarator { 1624 /* ^^ There is no check for the missing type-specifier. */ 1625 $$ = declare_argument($3, false); 1626 } 1627 | begin_type_declaration_specifiers end_type abstract_declarator { 1628 $$ = declare_argument($3, false); 1629 } 1630 ; 1631 1632 braced_initializer: 1633 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1634 init_lbrace init_rbrace { 1635 /* empty initializer braces require C23 or later */ 1636 c23ism(353); 1637 } 1638 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1639 | init_lbrace initializer_list comma_opt init_rbrace 1640 ; 1641 1642 initializer: /* C99 6.7.8 "Initialization" */ 1643 assignment_expression { 1644 init_expr($1); 1645 } 1646 | init_lbrace init_rbrace { 1647 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1648 } 1649 | init_lbrace initializer_list comma_opt init_rbrace 1650 /* XXX: What is this error handling for? */ 1651 | error 1652 ; 1653 1654 initializer_list: /* C99 6.7.8 "Initialization" */ 1655 initializer_list_item 1656 | initializer_list T_COMMA initializer_list_item 1657 ; 1658 1659 initializer_list_item: /* helper */ 1660 designation initializer 1661 | initializer 1662 ; 1663 1664 designation: /* C99 6.7.8 "Initialization" */ 1665 begin_designation designator_list T_ASSIGN 1666 | identifier T_COLON { 1667 /* GCC style struct or union member name in initializer */ 1668 gnuism(315); 1669 begin_designation(); 1670 add_designator_member($1); 1671 } 1672 ; 1673 1674 begin_designation: /* lint-specific helper */ 1675 /* empty */ { 1676 begin_designation(); 1677 } 1678 ; 1679 1680 designator_list: /* C99 6.7.8 "Initialization" */ 1681 designator 1682 | designator_list designator 1683 ; 1684 1685 designator: /* C99 6.7.8 "Initialization" */ 1686 T_LBRACK range T_RBRACK { 1687 if (!allow_c99) 1688 /* array initializer with designators is a C99 ... */ 1689 warning(321); 1690 add_designator_subscript($2); 1691 } 1692 | T_POINT identifier { 1693 if (!allow_c99) 1694 /* struct or union member name in initializer is ... */ 1695 warning(313); 1696 add_designator_member($2); 1697 } 1698 ; 1699 1700 static_assert_declaration: 1701 T_STATIC_ASSERT T_LPAREN 1702 constant_expression T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1703 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI /* C23 */ 1704 ; 1705 1706 range: 1707 constant_expression { 1708 $$.lo = to_int_constant($1, true); 1709 $$.hi = $$.lo; 1710 } 1711 | constant_expression T_ELLIPSIS constant_expression { 1712 $$.lo = to_int_constant($1, true); 1713 $$.hi = to_int_constant($3, true); 1714 /* initialization with '[a...b]' is a GCC extension */ 1715 gnuism(340); 1716 } 1717 ; 1718 1719 init_lbrace: /* helper */ 1720 T_LBRACE { 1721 init_lbrace(); 1722 } 1723 ; 1724 1725 init_rbrace: /* helper */ 1726 T_RBRACE { 1727 init_rbrace(); 1728 } 1729 ; 1730 1731 asm_or_symbolrename_opt: /* GCC extensions */ 1732 /* empty */ { 1733 $$ = NULL; 1734 } 1735 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1736 freeyyv(&$3, T_STRING); 1737 $$ = NULL; 1738 } 1739 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1740 gcc_attribute_specifier_list_opt { 1741 $$ = $3; 1742 } 1743 ; 1744 1745 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1746 statement: 1747 expression_statement 1748 | non_expr_statement 1749 ; 1750 1751 non_expr_statement: /* helper for C99 6.8 */ 1752 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1753 | labeled_statement 1754 | compound_statement 1755 | selection_statement 1756 | iteration_statement 1757 | jump_statement { 1758 seen_fallthrough = false; 1759 } 1760 | asm_statement 1761 ; 1762 1763 labeled_statement: /* C99 6.8.1 */ 1764 label gcc_attribute_specifier_list_opt statement 1765 ; 1766 1767 label: 1768 T_NAME T_COLON { 1769 set_symtyp(FLABEL); 1770 named_label(getsym($1)); 1771 } 1772 | T_CASE constant_expression T_COLON { 1773 case_label($2); 1774 seen_fallthrough = true; 1775 } 1776 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1777 /* XXX: We don't fill all cases */ 1778 case_label($2); 1779 seen_fallthrough = true; 1780 } 1781 | T_DEFAULT T_COLON { 1782 default_label(); 1783 seen_fallthrough = true; 1784 } 1785 ; 1786 1787 compound_statement: /* C99 6.8.2 */ 1788 compound_statement_lbrace compound_statement_rbrace 1789 | compound_statement_lbrace block_item_list compound_statement_rbrace 1790 ; 1791 1792 compound_statement_lbrace: 1793 T_LBRACE { 1794 block_level++; 1795 mem_block_level++; 1796 begin_declaration_level(DLK_AUTO); 1797 } 1798 ; 1799 1800 compound_statement_rbrace: 1801 T_RBRACE { 1802 end_declaration_level(); 1803 level_free_all(mem_block_level); 1804 mem_block_level--; 1805 block_level--; 1806 seen_fallthrough = false; 1807 } 1808 ; 1809 1810 block_item_list: /* C99 6.8.2 */ 1811 block_item 1812 | block_item_list block_item { 1813 if ($1 && !$2) 1814 /* declarations after statements is a C99 feature */ 1815 c99ism(327); 1816 $$ = $1 || $2; 1817 } 1818 ; 1819 1820 block_item: /* C99 6.8.2 */ 1821 declaration_or_error { 1822 $$ = false; 1823 restore_warning_flags(); 1824 } 1825 | statement { 1826 $$ = true; 1827 restore_warning_flags(); 1828 } 1829 ; 1830 1831 expression_statement: /* C99 6.8.3 */ 1832 expression T_SEMI { 1833 expr($1, false, false, false, false); 1834 seen_fallthrough = false; 1835 } 1836 | T_SEMI { 1837 check_statement_reachable(); 1838 seen_fallthrough = false; 1839 } 1840 ; 1841 1842 selection_statement: /* C99 6.8.4 */ 1843 if_without_else %prec T_THEN { 1844 save_warning_flags(); 1845 stmt_if_then_stmt(); 1846 stmt_if_else_stmt(false); 1847 } 1848 | if_without_else T_ELSE { 1849 save_warning_flags(); 1850 stmt_if_then_stmt(); 1851 } statement { 1852 clear_warning_flags(); 1853 stmt_if_else_stmt(true); 1854 } 1855 | if_without_else T_ELSE error { 1856 clear_warning_flags(); 1857 stmt_if_else_stmt(false); 1858 } 1859 | switch_expr statement { 1860 clear_warning_flags(); 1861 stmt_switch_expr_stmt(); 1862 } 1863 | switch_expr error { 1864 clear_warning_flags(); 1865 stmt_switch_expr_stmt(); 1866 } 1867 ; 1868 1869 if_without_else: /* see C99 6.8.4 */ 1870 if_expr statement 1871 | if_expr error 1872 ; 1873 1874 if_expr: /* see C99 6.8.4 */ 1875 T_IF T_LPAREN expression T_RPAREN { 1876 stmt_if_expr($3); 1877 clear_warning_flags(); 1878 } 1879 ; 1880 1881 switch_expr: /* see C99 6.8.4 */ 1882 T_SWITCH T_LPAREN expression T_RPAREN { 1883 stmt_switch_expr($3); 1884 clear_warning_flags(); 1885 } 1886 ; 1887 1888 iteration_statement: /* C99 6.8.5 */ 1889 while_expr statement { 1890 clear_warning_flags(); 1891 stmt_while_expr_stmt(); 1892 } 1893 | while_expr error { 1894 clear_warning_flags(); 1895 stmt_while_expr_stmt(); 1896 } 1897 | do_statement do_while_expr { 1898 stmt_do_while_expr($2); 1899 seen_fallthrough = false; 1900 } 1901 | do error { 1902 clear_warning_flags(); 1903 stmt_do_while_expr(NULL); 1904 } 1905 | for_exprs statement { 1906 clear_warning_flags(); 1907 stmt_for_exprs_stmt(); 1908 end_declaration_level(); 1909 block_level--; 1910 } 1911 | for_exprs error { 1912 clear_warning_flags(); 1913 stmt_for_exprs_stmt(); 1914 end_declaration_level(); 1915 block_level--; 1916 } 1917 ; 1918 1919 while_expr: /* see C99 6.8.5 */ 1920 T_WHILE T_LPAREN expression T_RPAREN { 1921 stmt_while_expr($3); 1922 clear_warning_flags(); 1923 } 1924 ; 1925 1926 do_statement: /* see C99 6.8.5 */ 1927 do statement { 1928 clear_warning_flags(); 1929 } 1930 ; 1931 1932 do: /* see C99 6.8.5 */ 1933 T_DO { 1934 stmt_do(); 1935 } 1936 ; 1937 1938 do_while_expr: /* see C99 6.8.5 */ 1939 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1940 $$ = $3; 1941 } 1942 ; 1943 1944 for_start: /* see C99 6.8.5 */ 1945 T_FOR T_LPAREN { 1946 begin_declaration_level(DLK_AUTO); 1947 block_level++; 1948 } 1949 ; 1950 1951 for_exprs: /* see C99 6.8.5 */ 1952 for_start 1953 begin_type_declaration_specifiers end_type 1954 notype_init_declarators T_SEMI 1955 expression_opt T_SEMI 1956 expression_opt T_RPAREN { 1957 /* variable declaration in for loop */ 1958 c99ism(325); 1959 stmt_for_exprs(NULL, $6, $8); 1960 clear_warning_flags(); 1961 } 1962 | for_start 1963 expression_opt T_SEMI 1964 expression_opt T_SEMI 1965 expression_opt T_RPAREN { 1966 stmt_for_exprs($2, $4, $6); 1967 clear_warning_flags(); 1968 } 1969 ; 1970 1971 jump_statement: /* C99 6.8.6 */ 1972 goto identifier T_SEMI { 1973 stmt_goto(getsym($2)); 1974 } 1975 | goto error T_SEMI { 1976 set_symtyp(FVFT); 1977 } 1978 | T_CONTINUE T_SEMI { 1979 stmt_continue(); 1980 } 1981 | T_BREAK T_SEMI { 1982 stmt_break(); 1983 } 1984 | T_RETURN sys T_SEMI { 1985 stmt_return($2, NULL); 1986 } 1987 | T_RETURN sys expression T_SEMI { 1988 stmt_return($2, $3); 1989 } 1990 ; 1991 1992 goto: /* see C99 6.8.6 */ 1993 T_GOTO { 1994 set_symtyp(FLABEL); 1995 } 1996 ; 1997 1998 asm_statement: /* GCC extension */ 1999 T_ASM T_LPAREN read_until_rparen T_SEMI { 2000 dcs_set_asm(); 2001 } 2002 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2003 dcs_set_asm(); 2004 } 2005 | T_ASM error 2006 ; 2007 2008 read_until_rparen: /* helper for 'asm_statement' */ 2009 /* empty */ { 2010 read_until_rparen(); 2011 } 2012 ; 2013 2014 translation_unit: /* C99 6.9 */ 2015 external_declaration 2016 | translation_unit external_declaration 2017 ; 2018 2019 external_declaration: /* C99 6.9 */ 2020 function_definition { 2021 global_clean_up_decl(false); 2022 clear_warning_flags(); 2023 } 2024 | top_level_declaration { 2025 global_clean_up_decl(false); 2026 clear_warning_flags(); 2027 } 2028 | asm_statement /* GCC extension */ 2029 | T_SEMI { /* GCC extension */ 2030 /* 2031 * TODO: Only allow this in GCC mode, not in plain C99. 2032 * This is one of the top 10 warnings in the NetBSD build. 2033 */ 2034 if (!allow_trad && !allow_c99) { 2035 /* empty declaration */ 2036 error(0); 2037 } else if (allow_c90) { 2038 /* empty declaration */ 2039 warning(0); 2040 } 2041 } 2042 ; 2043 2044 /* 2045 * On the top level, lint allows several forms of declarations that it doesn't 2046 * allow in functions. For example, a single ';' is an empty declaration and 2047 * is supported by some compilers, but in a function it would be an empty 2048 * statement, not a declaration. This makes a difference in C90 mode, where 2049 * a statement must not be followed by a declaration. 2050 * 2051 * See 'declaration' for all other declarations. 2052 */ 2053 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2054 begin_type end_type notype_init_declarators T_SEMI { 2055 /* TODO: Make this an error in C99 mode as well. */ 2056 if (!allow_trad && !allow_c99) { 2057 /* old-style declaration; add 'int' */ 2058 error(1); 2059 } else if (allow_c90) { 2060 /* old-style declaration; add 'int' */ 2061 warning(1); 2062 } 2063 } 2064 | declaration 2065 | error T_SEMI { 2066 global_clean_up(); 2067 } 2068 | error T_RBRACE { 2069 global_clean_up(); 2070 } 2071 ; 2072 2073 function_definition: /* C99 6.9.1 */ 2074 func_declarator { 2075 if ($1->s_type->t_tspec != FUNC) { 2076 /* syntax error '%s' */ 2077 error(249, yytext); 2078 YYERROR; 2079 } 2080 if ($1->s_type->t_typedef) { 2081 /* ()-less function definition */ 2082 error(64); 2083 YYERROR; 2084 } 2085 check_extern_declaration($1); 2086 begin_function($1); 2087 block_level++; 2088 begin_declaration_level(DLK_OLD_STYLE_ARGS); 2089 if (lwarn == LWARN_NONE) 2090 $1->s_used = true; 2091 } arg_declaration_list_opt { 2092 end_declaration_level(); 2093 block_level--; 2094 check_func_lint_directives(); 2095 check_func_old_style_arguments(); 2096 begin_control_statement(CS_FUNCTION_BODY); 2097 } compound_statement { 2098 end_function(); 2099 end_control_statement(CS_FUNCTION_BODY); 2100 } 2101 ; 2102 2103 func_declarator: 2104 begin_type end_type notype_declarator { 2105 if (!allow_trad) { 2106 /* old-style declaration; add 'int' */ 2107 error(1); 2108 } 2109 $$ = $3; 2110 } 2111 | begin_type_declmods end_type notype_declarator { 2112 if (!allow_trad) { 2113 /* old-style declaration; add 'int' */ 2114 error(1); 2115 } 2116 $$ = $3; 2117 } 2118 | begin_type_declaration_specifiers end_type type_declarator { 2119 $$ = $3; 2120 } 2121 ; 2122 2123 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2124 /* empty */ 2125 | arg_declaration_list 2126 ; 2127 2128 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2129 arg_declaration 2130 | arg_declaration_list arg_declaration 2131 /* XXX or better "arg_declaration error" ? */ 2132 | error 2133 ; 2134 2135 /* 2136 * "arg_declaration" is separated from "declaration" because it 2137 * needs other error handling. 2138 */ 2139 arg_declaration: 2140 begin_type_declmods end_type T_SEMI { 2141 /* empty declaration */ 2142 warning(2); 2143 } 2144 | begin_type_declmods end_type notype_init_declarators T_SEMI 2145 | begin_type_declaration_specifiers end_type T_SEMI { 2146 if (!dcs->d_nonempty_decl) { 2147 /* empty declaration */ 2148 warning(2); 2149 } else { 2150 /* '%s' declared in argument declaration list */ 2151 warning(3, type_name(dcs->d_type)); 2152 } 2153 } 2154 | begin_type_declaration_specifiers end_type 2155 type_init_declarators T_SEMI { 2156 if (dcs->d_nonempty_decl) { 2157 /* '%s' declared in argument declaration list */ 2158 warning(3, type_name(dcs->d_type)); 2159 } 2160 } 2161 | begin_type_declmods error 2162 | begin_type_declaration_specifiers error 2163 ; 2164 2165 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2166 gcc_attribute_specifier_list_opt: 2167 /* empty */ 2168 | gcc_attribute_specifier_list 2169 ; 2170 2171 gcc_attribute_specifier_list: 2172 gcc_attribute_specifier 2173 | gcc_attribute_specifier_list gcc_attribute_specifier 2174 ; 2175 2176 gcc_attribute_specifier: 2177 T_ATTRIBUTE T_LPAREN T_LPAREN { 2178 in_gcc_attribute = true; 2179 } gcc_attribute_list { 2180 in_gcc_attribute = false; 2181 } T_RPAREN T_RPAREN 2182 ; 2183 2184 gcc_attribute_list: 2185 gcc_attribute 2186 | gcc_attribute_list T_COMMA gcc_attribute 2187 ; 2188 2189 gcc_attribute: 2190 /* empty */ 2191 | T_NAME { 2192 const char *name = $1->sb_name; 2193 if (is_either(name, "packed", "__packed__")) 2194 dcs_add_packed(); 2195 else if (is_either(name, "used", "__used__") || 2196 is_either(name, "unused", "__unused__")) 2197 dcs_set_used(); 2198 else if (is_either(name, "fallthrough", "__fallthrough__")) 2199 fallthru(1); 2200 } 2201 | T_NAME T_LPAREN T_RPAREN 2202 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2203 | type_qualifier { 2204 if ($1 != CONST) 2205 yyerror("Bad attribute"); 2206 } 2207 ; 2208 2209 gcc_attribute_parameters: 2210 constant_expression 2211 | gcc_attribute_parameters T_COMMA constant_expression 2212 ; 2213 2214 sys: 2215 /* empty */ { 2216 $$ = in_system_header; 2217 } 2218 ; 2219 2220 %% 2221 2222 /* ARGSUSED */ 2223 int 2224 yyerror(const char *msg) 2225 { 2226 /* syntax error '%s' */ 2227 error(249, yytext); 2228 if (++sytxerr >= 5) 2229 norecover(); 2230 return 0; 2231 } 2232 2233 #if YYDEBUG && YYBYACC 2234 static const char * 2235 cgram_to_string(int token, YYSTYPE val) 2236 { 2237 2238 switch (token) { 2239 case T_INCDEC: 2240 case T_MULTIPLICATIVE: 2241 case T_ADDITIVE: 2242 case T_SHIFT: 2243 case T_RELATIONAL: 2244 case T_EQUALITY: 2245 case T_OPASSIGN: 2246 return op_name(val.y_op); 2247 case T_SCLASS: 2248 return scl_name(val.y_scl); 2249 case T_TYPE: 2250 case T_STRUCT_OR_UNION: 2251 return tspec_name(val.y_tspec); 2252 case T_QUAL: 2253 return tqual_name(val.y_tqual); 2254 case T_NAME: 2255 return val.y_name->sb_name; 2256 default: 2257 return "<none>"; 2258 } 2259 } 2260 #endif 2261 2262 static void 2263 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2264 { 2265 declare(decl, has_initializer, renaming); 2266 if (renaming != NULL) 2267 freeyyv(&renaming, T_NAME); 2268 } 2269 2270 /* 2271 * Discard all input tokens up to and including the next 2272 * unmatched right paren 2273 */ 2274 static void 2275 read_until_rparen(void) 2276 { 2277 int level; 2278 2279 if (yychar < 0) 2280 yychar = yylex(); 2281 freeyyv(&yylval, yychar); 2282 2283 level = 1; 2284 while (yychar > 0) { 2285 if (yychar == T_LPAREN) 2286 level++; 2287 if (yychar == T_RPAREN && --level == 0) 2288 break; 2289 freeyyv(&yylval, yychar = yylex()); 2290 } 2291 2292 yyclearin; 2293 } 2294 2295 static sym_t * 2296 symbolrename(sym_t *s, sbuf_t *sb) 2297 { 2298 if (sb != NULL) 2299 s->s_rename = sb->sb_name; 2300 return s; 2301 } 2302
Indexes created Sat Oct 11 19:10:01 GMT 2025