cgram.y revision 1.478
1 %{ 2 /* $NetBSD: cgram.y,v 1.478 2024/01/09 23:46:54 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 1.478 2024/01/09 23:46:54 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 103 136 137 %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 designation y_designation; 158 }; 159 160 /* for Bison: 161 %printer { 162 if (is_integer($$->v_tspec)) 163 fprintf(yyo, "%lld", (long long)$$->u.integer); 164 else 165 fprintf(yyo, "%Lg", $$->u.floating); 166 } <y_val> 167 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 168 %printer { 169 bool indented = debug_push_indented(true); 170 debug_sym("", $$, ""); 171 debug_pop_indented(indented); 172 } <y_sym> 173 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 174 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 175 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 176 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 177 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 178 %printer { 179 fprintf(yyo, "%s", function_specifier_name($$)); 180 } <y_function_specifier> 181 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 182 %printer { 183 if ($$ == NULL) 184 fprintf(yyo, "<null>"); 185 else 186 fprintf(yyo, "%s '%s'", 187 op_name($$->tn_op), type_name($$->tn_type)); 188 } <y_tnode> 189 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 190 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 191 %printer { 192 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 193 } <y_qual_ptr> 194 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 195 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 196 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 197 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 198 */ 199 200 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 201 %token T_POINT T_ARROW 202 %token T_COMPLEMENT T_LOGNOT 203 %token <y_inc> T_INCDEC 204 %token T_SIZEOF 205 %token T_BUILTIN_OFFSETOF 206 %token T_TYPEOF 207 %token T_EXTENSION 208 %token T_ALIGNAS 209 %token T_ALIGNOF 210 %token T_ASTERISK 211 %token <y_op> T_MULTIPLICATIVE 212 %token <y_op> T_ADDITIVE 213 %token <y_op> T_SHIFT 214 %token <y_op> T_RELATIONAL 215 %token <y_op> T_EQUALITY 216 %token T_AMPER 217 %token T_BITXOR 218 %token T_BITOR 219 %token T_LOGAND 220 %token T_LOGOR 221 %token T_QUEST 222 %token T_COLON 223 %token T_ASSIGN 224 %token <y_op> T_OPASSIGN 225 %token T_COMMA 226 %token T_SEMI 227 %token T_ELLIPSIS 228 %token T_REAL 229 %token T_IMAG 230 %token T_GENERIC 231 232 /* storage classes (extern, static, auto, register and typedef) */ 233 %token <y_scl> T_SCLASS 234 %token <y_function_specifier> T_FUNCTION_SPECIFIER 235 236 /* 237 * predefined type keywords (char, int, short, long, unsigned, signed, 238 * float, double, void); see T_TYPENAME for types from typedef 239 */ 240 %token <y_tspec> T_TYPE 241 242 %token <y_type_qualifiers> T_QUAL 243 %token <y_type_qualifiers> T_ATOMIC 244 245 /* struct or union */ 246 %token <y_tspec> T_STRUCT_OR_UNION 247 248 /* remaining keywords */ 249 %token T_ASM 250 %token T_BREAK 251 %token T_CASE 252 %token T_CONTINUE 253 %token T_DEFAULT 254 %token T_DO 255 %token T_ELSE 256 %token T_ENUM 257 %token T_FOR 258 %token T_GOTO 259 %token T_IF 260 %token T_PACKED 261 %token T_RETURN 262 %token T_SWITCH 263 %token T_SYMBOLRENAME 264 %token T_WHILE 265 %token T_STATIC_ASSERT 266 267 %token T_ATTRIBUTE 268 269 %left T_THEN 270 %left T_ELSE 271 %right T_QUEST T_COLON 272 %left T_LOGOR 273 %left T_LOGAND 274 %left T_BITOR 275 %left T_BITXOR 276 %left T_AMPER 277 %left T_EQUALITY 278 %left T_RELATIONAL 279 %left T_SHIFT 280 %left T_ADDITIVE 281 %left T_ASTERISK T_MULTIPLICATIVE 282 283 %token <y_name> T_NAME 284 %token <y_name> T_TYPENAME 285 %token <y_val> T_CON 286 %token <y_string> T_STRING 287 288 /* No type for program. */ 289 %type <y_sym> identifier_sym 290 %type <y_name> identifier 291 %type <y_string> string 292 %type <y_tnode> primary_expression 293 %type <y_designation> member_designator 294 %type <y_tnode> generic_selection 295 %type <y_generic> generic_assoc_list 296 %type <y_generic> generic_association 297 %type <y_tnode> postfix_expression 298 /* No type for comma_opt. */ 299 %type <y_tnode> gcc_statement_expr_list 300 %type <y_tnode> gcc_statement_expr_item 301 %type <y_op> point_or_arrow 302 %type <y_tnode> argument_expression_list 303 %type <y_tnode> unary_expression 304 %type <y_tnode> cast_expression 305 %type <y_tnode> expression_opt 306 %type <y_tnode> conditional_expression 307 %type <y_tnode> assignment_expression 308 %type <y_tnode> expression 309 %type <y_tnode> constant_expression 310 /* No type for declaration_or_error. */ 311 /* No type for declaration. */ 312 /* No type for begin_type_declaration_specifiers. */ 313 /* No type for begin_type_declmods. */ 314 /* No type for begin_type_specifier_qualifier_list. */ 315 /* No type for begin_type_specifier_qualifier_list_postfix. */ 316 %type <y_type> begin_type_typespec 317 /* No type for begin_type_qualifier_list. */ 318 /* No type for declmod. */ 319 /* No type for type_attribute_list_opt. */ 320 /* No type for type_attribute_list. */ 321 /* No type for type_attribute_opt. */ 322 /* No type for type_attribute. */ 323 /* No type for begin_type. */ 324 /* No type for end_type. */ 325 %type <y_type> type_specifier 326 %type <y_type> notype_type_specifier 327 %type <y_type> atomic_type_specifier 328 %type <y_type> struct_or_union_specifier 329 %type <y_tspec> struct_or_union 330 %type <y_sym> braced_member_declaration_list 331 /* No type for member_declaration_lbrace. */ 332 %type <y_sym> member_declaration_list_with_rbrace 333 %type <y_sym> member_declaration_list 334 %type <y_sym> member_declaration 335 %type <y_sym> notype_member_declarators 336 %type <y_sym> type_member_declarators 337 %type <y_sym> notype_member_declarator 338 %type <y_sym> type_member_declarator 339 %type <y_type> enum_specifier 340 /* No type for enum. */ 341 %type <y_sym> enum_declaration 342 /* No type for enum_decl_lbrace. */ 343 %type <y_sym> enums_with_opt_comma 344 %type <y_sym> enumerator_list 345 %type <y_sym> enumerator 346 %type <y_type_qualifiers> type_qualifier 347 /* No type for atomic. */ 348 %type <y_qual_ptr> pointer 349 %type <y_type_qualifiers> type_qualifier_list_opt 350 %type <y_type_qualifiers> type_qualifier_list 351 /* No type for notype_init_declarators. */ 352 /* No type for type_init_declarators. */ 353 /* No type for notype_init_declarator. */ 354 /* No type for type_init_declarator. */ 355 %type <y_sym> notype_declarator 356 %type <y_sym> type_declarator 357 %type <y_sym> notype_direct_declarator 358 %type <y_sym> type_direct_declarator 359 %type <y_sym> type_param_declarator 360 %type <y_sym> notype_param_declarator 361 %type <y_sym> direct_param_declarator 362 %type <y_sym> direct_notype_param_declarator 363 %type <y_parameter_list> param_list 364 /* No type for id_list_lparen. */ 365 %type <y_array_size> array_size_opt 366 %type <y_tnode> array_size 367 %type <y_sym> identifier_list 368 %type <y_type> type_name 369 %type <y_sym> abstract_declaration 370 %type <y_sym> abstract_declarator 371 %type <y_sym> direct_abstract_declarator 372 %type <y_parameter_list> abstract_decl_param_list 373 /* No type for abstract_decl_lparen. */ 374 %type <y_parameter_list> vararg_parameter_type_list 375 %type <y_parameter_list> parameter_type_list 376 %type <y_sym> parameter_declaration 377 /* No type for braced_initializer. */ 378 /* No type for initializer. */ 379 /* No type for initializer_list. */ 380 /* No type for initializer_list_item. */ 381 /* No type for designation. */ 382 /* No type for begin_designation. */ 383 /* No type for designator_list. */ 384 /* No type for designator. */ 385 /* No type for static_assert_declaration. */ 386 %type <y_range> range 387 /* No type for init_lbrace. */ 388 /* No type for init_rbrace. */ 389 %type <y_name> asm_or_symbolrename_opt 390 /* No type for statement. */ 391 /* No type for no_attr_statement. */ 392 /* No type for non_expr_statement. */ 393 /* No type for no_attr_non_expr_statement. */ 394 /* No type for labeled_statement. */ 395 /* No type for label. */ 396 /* No type for compound_statement. */ 397 /* No type for compound_statement_lbrace. */ 398 /* No type for compound_statement_rbrace. */ 399 %type <y_seen_statement> block_item_list 400 %type <y_seen_statement> block_item 401 /* No type for expression_statement. */ 402 /* No type for selection_statement. */ 403 /* No type for if_without_else. */ 404 /* No type for if_expr. */ 405 /* No type for switch_expr. */ 406 /* No type for iteration_statement. */ 407 /* No type for while_expr. */ 408 /* No type for do_statement. */ 409 /* No type for do. */ 410 %type <y_tnode> do_while_expr 411 /* No type for for_start. */ 412 /* No type for for_exprs. */ 413 /* No type for jump_statement. */ 414 /* No type for goto. */ 415 /* No type for asm_statement. */ 416 /* No type for read_until_rparen. */ 417 /* No type for translation_unit. */ 418 /* No type for external_declaration. */ 419 /* No type for top_level_declaration. */ 420 /* No type for function_definition. */ 421 %type <y_sym> func_declarator 422 /* No type for arg_declaration_list_opt. */ 423 /* No type for arg_declaration_list. */ 424 /* No type for arg_declaration. */ 425 /* No type for gcc_attribute_specifier_list_opt. */ 426 /* No type for gcc_attribute_specifier_list. */ 427 /* No type for gcc_attribute_specifier. */ 428 /* No type for gcc_attribute_list. */ 429 /* No type for gcc_attribute. */ 430 /* No type for gcc_attribute_parameters. */ 431 %type <y_in_system_header> sys 432 433 %% 434 435 program: 436 /* empty */ { 437 /* TODO: Make this an error in C99 mode as well. */ 438 if (!allow_trad && !allow_c99) { 439 /* empty translation unit */ 440 error(272); 441 } else if (allow_c90) { 442 /* empty translation unit */ 443 warning(272); 444 } 445 } 446 | translation_unit 447 ; 448 449 identifier_sym: /* helper for struct/union/enum */ 450 identifier { 451 $$ = getsym($1); 452 } 453 ; 454 455 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 456 identifier: 457 T_NAME { 458 debug_step("cgram: name '%s'", $1->sb_name); 459 $$ = $1; 460 } 461 | T_TYPENAME { 462 debug_step("cgram: typename '%s'", $1->sb_name); 463 $$ = $1; 464 } 465 ; 466 467 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 468 string: 469 T_STRING 470 | string T_STRING { 471 if (!allow_c90) { 472 /* concatenated strings are illegal in traditional C */ 473 warning(219); 474 } 475 $$ = cat_strings($1, $2); 476 } 477 ; 478 479 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 480 primary_expression: 481 T_NAME { 482 bool sys_name, sys_next; 483 sys_name = in_system_header; 484 if (yychar < 0) 485 yychar = yylex(); 486 sys_next = in_system_header; 487 in_system_header = sys_name; 488 $$ = build_name(getsym($1), yychar == T_LPAREN); 489 in_system_header = sys_next; 490 } 491 | T_CON { 492 $$ = build_constant(gettyp($1->v_tspec), $1); 493 } 494 | string { 495 $$ = build_string($1); 496 } 497 | T_LPAREN expression T_RPAREN { 498 if ($2 != NULL) 499 $2->tn_parenthesized = true; 500 $$ = $2; 501 } 502 | generic_selection 503 /* GCC primary-expression, see c_parser_postfix_expression */ 504 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 505 set_symtyp(FMEMBER); 506 } member_designator T_RPAREN { 507 $$ = build_offsetof($3, $6); 508 } 509 ; 510 511 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 512 member_designator: 513 identifier { 514 $$ = (designation) { .dn_len = 0 }; 515 designation_push(&$$, DK_STRUCT /* or union */, getsym($1), 0); 516 } 517 | member_designator T_LBRACK range T_RBRACK { 518 $$ = $1; 519 designation_push(&$$, DK_ARRAY, NULL, $3.lo); 520 } 521 | member_designator T_POINT { 522 set_symtyp(FMEMBER); 523 } identifier { 524 $$ = $1; 525 designation_push(&$$, DK_STRUCT /* or union */, getsym($4), 0); 526 } 527 ; 528 529 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 530 generic_selection: 531 T_GENERIC T_LPAREN assignment_expression T_COMMA 532 generic_assoc_list T_RPAREN { 533 /* generic selection requires C11 or later */ 534 c11ism(345); 535 $$ = build_generic_selection($3, $5); 536 } 537 ; 538 539 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 540 generic_assoc_list: 541 generic_association 542 | generic_assoc_list T_COMMA generic_association { 543 $3->ga_prev = $1; 544 $$ = $3; 545 } 546 ; 547 548 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 549 generic_association: 550 type_name T_COLON assignment_expression { 551 $$ = block_zero_alloc(sizeof(*$$), "generic"); 552 $$->ga_arg = $1; 553 $$->ga_result = $3; 554 } 555 | T_DEFAULT T_COLON assignment_expression { 556 $$ = block_zero_alloc(sizeof(*$$), "generic"); 557 $$->ga_arg = NULL; 558 $$->ga_result = $3; 559 } 560 ; 561 562 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 563 postfix_expression: 564 primary_expression 565 | postfix_expression T_LBRACK sys expression T_RBRACK { 566 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 567 } 568 | postfix_expression T_LPAREN sys T_RPAREN { 569 $$ = build_function_call($1, $3, NULL); 570 } 571 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 572 $$ = build_function_call($1, $3, $4); 573 } 574 | postfix_expression point_or_arrow sys T_NAME { 575 $$ = build_member_access($1, $2, $3, $4); 576 } 577 | postfix_expression T_INCDEC sys { 578 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 579 } 580 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 581 sym_t *tmp = mktempsym($2); 582 begin_initialization(tmp); 583 cgram_declare(tmp, true, NULL); 584 } braced_initializer { 585 if (!allow_c99) 586 /* compound literals are a C99/GCC extension */ 587 gnuism(319); 588 $$ = build_name(current_initsym(), false); 589 end_initialization(); 590 } 591 | T_LPAREN compound_statement_lbrace { 592 begin_statement_expr(); 593 } gcc_statement_expr_list { 594 do_statement_expr($4); 595 } compound_statement_rbrace T_RPAREN { 596 $$ = end_statement_expr(); 597 } 598 ; 599 600 comma_opt: /* helper for 'postfix_expression' */ 601 /* empty */ 602 | T_COMMA 603 ; 604 605 /* 606 * The inner part of a GCC statement-expression of the form ({ ... }). 607 * 608 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 609 */ 610 gcc_statement_expr_list: 611 gcc_statement_expr_item 612 | gcc_statement_expr_list gcc_statement_expr_item { 613 $$ = $2; 614 } 615 ; 616 617 gcc_statement_expr_item: 618 declaration_or_error { 619 clear_warning_flags(); 620 $$ = NULL; 621 } 622 | non_expr_statement { 623 $$ = expr_alloc_tnode(); 624 $$->tn_type = gettyp(VOID); 625 } 626 | T_SEMI { 627 $$ = expr_alloc_tnode(); 628 $$->tn_type = gettyp(VOID); 629 } 630 | expression T_SEMI { 631 if ($1 == NULL) { /* in case of syntax errors */ 632 $$ = expr_alloc_tnode(); 633 $$->tn_type = gettyp(VOID); 634 } else { 635 /* XXX: do that only on the last name */ 636 if ($1->tn_op == NAME) 637 $1->tn_sym->s_used = true; 638 expr($1, false, false, false, false); 639 suppress_fallthrough = false; 640 $$ = $1; 641 } 642 } 643 ; 644 645 point_or_arrow: /* helper for 'postfix_expression' */ 646 T_POINT { 647 set_symtyp(FMEMBER); 648 $$ = POINT; 649 } 650 | T_ARROW { 651 set_symtyp(FMEMBER); 652 $$ = ARROW; 653 } 654 ; 655 656 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 657 argument_expression_list: 658 assignment_expression { 659 $$ = build_function_argument(NULL, $1); 660 } 661 | argument_expression_list T_COMMA assignment_expression { 662 $$ = build_function_argument($1, $3); 663 } 664 ; 665 666 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 667 unary_expression: 668 postfix_expression 669 | T_INCDEC sys unary_expression { 670 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 671 } 672 | T_AMPER sys cast_expression { 673 $$ = build_unary(ADDR, $2, $3); 674 } 675 | T_ASTERISK sys cast_expression { 676 $$ = build_unary(INDIR, $2, $3); 677 } 678 | T_ADDITIVE sys cast_expression { 679 if (!allow_c90 && $1 == PLUS) { 680 /* unary '+' is illegal in traditional C */ 681 warning(100); 682 } 683 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 684 } 685 | T_COMPLEMENT sys cast_expression { 686 $$ = build_unary(COMPL, $2, $3); 687 } 688 | T_LOGNOT sys cast_expression { 689 $$ = build_unary(NOT, $2, $3); 690 } 691 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 692 $$ = build_unary(REAL, $2, $3); 693 } 694 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 695 $$ = build_unary(IMAG, $2, $3); 696 } 697 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 698 $$ = $2; 699 } 700 | T_SIZEOF unary_expression { 701 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 702 if ($$ != NULL) 703 check_expr_misc($2, 704 false, false, false, false, false, true); 705 } 706 | T_SIZEOF T_LPAREN type_name T_RPAREN { 707 $$ = build_sizeof($3); 708 } 709 | T_ALIGNOF unary_expression { 710 /* non type argument to alignof is a GCC extension */ 711 gnuism(349); 712 lint_assert($2 != NULL); 713 $$ = build_alignof($2->tn_type); 714 } 715 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 716 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 717 /* TODO: c11ism */ 718 $$ = build_alignof($3); 719 } 720 ; 721 722 /* The rule 'unary_operator' is inlined into unary_expression. */ 723 724 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 725 cast_expression: 726 unary_expression 727 | T_LPAREN type_name T_RPAREN cast_expression { 728 $$ = cast($4, $2); 729 } 730 ; 731 732 expression_opt: 733 /* empty */ { 734 $$ = NULL; 735 } 736 | expression 737 ; 738 739 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 740 /* 'conditional_expression' also implements 'additive_expression'. */ 741 /* 'conditional_expression' also implements 'shift_expression'. */ 742 /* 'conditional_expression' also implements 'relational_expression'. */ 743 /* 'conditional_expression' also implements 'equality_expression'. */ 744 /* 'conditional_expression' also implements 'AND_expression'. */ 745 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 746 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 747 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 748 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 749 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 750 conditional_expression: 751 cast_expression 752 | conditional_expression T_ASTERISK sys conditional_expression { 753 $$ = build_binary($1, MULT, $3, $4); 754 } 755 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 756 $$ = build_binary($1, $2, $3, $4); 757 } 758 | conditional_expression T_ADDITIVE sys conditional_expression { 759 $$ = build_binary($1, $2, $3, $4); 760 } 761 | conditional_expression T_SHIFT sys conditional_expression { 762 $$ = build_binary($1, $2, $3, $4); 763 } 764 | conditional_expression T_RELATIONAL sys conditional_expression { 765 $$ = build_binary($1, $2, $3, $4); 766 } 767 | conditional_expression T_EQUALITY sys conditional_expression { 768 $$ = build_binary($1, $2, $3, $4); 769 } 770 | conditional_expression T_AMPER sys conditional_expression { 771 $$ = build_binary($1, BITAND, $3, $4); 772 } 773 | conditional_expression T_BITXOR sys conditional_expression { 774 $$ = build_binary($1, BITXOR, $3, $4); 775 } 776 | conditional_expression T_BITOR sys conditional_expression { 777 $$ = build_binary($1, BITOR, $3, $4); 778 } 779 | conditional_expression T_LOGAND sys conditional_expression { 780 $$ = build_binary($1, LOGAND, $3, $4); 781 } 782 | conditional_expression T_LOGOR sys conditional_expression { 783 $$ = build_binary($1, LOGOR, $3, $4); 784 } 785 | conditional_expression T_QUEST sys 786 expression T_COLON sys conditional_expression { 787 $$ = build_binary($1, QUEST, $3, 788 build_binary($4, COLON, $6, $7)); 789 } 790 ; 791 792 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 793 assignment_expression: 794 conditional_expression 795 | unary_expression T_ASSIGN sys assignment_expression { 796 $$ = build_binary($1, ASSIGN, $3, $4); 797 } 798 | unary_expression T_OPASSIGN sys assignment_expression { 799 $$ = build_binary($1, $2, $3, $4); 800 } 801 ; 802 803 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 804 expression: 805 assignment_expression 806 | expression T_COMMA sys assignment_expression { 807 $$ = build_binary($1, COMMA, $3, $4); 808 } 809 ; 810 811 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 812 constant_expression: 813 conditional_expression 814 ; 815 816 declaration_or_error: 817 declaration 818 | error T_SEMI 819 ; 820 821 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 822 declaration: 823 begin_type_declmods end_type T_SEMI { 824 if (dcs->d_scl == TYPEDEF) { 825 /* typedef declares no type name */ 826 warning(72); 827 } else { 828 /* empty declaration */ 829 warning(2); 830 } 831 } 832 | begin_type_declmods end_type notype_init_declarators T_SEMI { 833 if (dcs->d_scl == TYPEDEF) { 834 /* syntax error '%s' */ 835 error(249, "missing base type for typedef"); 836 } else { 837 /* old-style declaration; add 'int' */ 838 error(1); 839 } 840 } 841 | begin_type_declaration_specifiers end_type T_SEMI { 842 if (dcs->d_scl == TYPEDEF) { 843 /* typedef declares no type name */ 844 warning(72); 845 } else if (!dcs->d_nonempty_decl) { 846 /* empty declaration */ 847 warning(2); 848 } 849 } 850 | begin_type_declaration_specifiers end_type 851 type_init_declarators T_SEMI 852 | static_assert_declaration 853 ; 854 855 begin_type_declaration_specifiers: /* see C99 6.7 */ 856 begin_type_typespec { 857 dcs_add_type($1); 858 } 859 | begin_type_declmods type_specifier { 860 dcs_add_type($2); 861 } 862 | type_attribute begin_type_declaration_specifiers 863 | begin_type_declaration_specifiers declmod 864 | begin_type_declaration_specifiers notype_type_specifier { 865 dcs_add_type($2); 866 } 867 ; 868 869 begin_type_declmods: /* see C99 6.7 */ 870 begin_type type_qualifier { 871 dcs_add_qualifiers($2); 872 } 873 | begin_type T_SCLASS { 874 dcs_add_storage_class($2); 875 } 876 | begin_type T_FUNCTION_SPECIFIER { 877 dcs_add_function_specifier($2); 878 } 879 | begin_type_declmods declmod 880 ; 881 882 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 883 begin_type_specifier_qualifier_list_postfix 884 | type_attribute_list begin_type_specifier_qualifier_list_postfix 885 ; 886 887 begin_type_specifier_qualifier_list_postfix: 888 begin_type_typespec { 889 dcs_add_type($1); 890 } 891 | begin_type_qualifier_list type_specifier { 892 dcs_add_type($2); 893 } 894 | begin_type_specifier_qualifier_list_postfix type_qualifier { 895 dcs_add_qualifiers($2); 896 } 897 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 898 dcs_add_type($2); 899 } 900 | begin_type_specifier_qualifier_list_postfix type_attribute 901 ; 902 903 begin_type_typespec: 904 begin_type notype_type_specifier { 905 $$ = $2; 906 } 907 | begin_type T_TYPENAME { 908 $$ = getsym($2)->s_type; 909 } 910 ; 911 912 begin_type_qualifier_list: 913 begin_type type_qualifier { 914 dcs_add_qualifiers($2); 915 } 916 | begin_type_qualifier_list type_qualifier { 917 dcs_add_qualifiers($2); 918 } 919 ; 920 921 declmod: 922 type_qualifier { 923 dcs_add_qualifiers($1); 924 } 925 | T_SCLASS { 926 dcs_add_storage_class($1); 927 } 928 | T_FUNCTION_SPECIFIER { 929 dcs_add_function_specifier($1); 930 } 931 | type_attribute_list 932 ; 933 934 type_attribute_list_opt: 935 /* empty */ 936 | type_attribute_list 937 ; 938 939 type_attribute_list: 940 type_attribute 941 | type_attribute_list type_attribute 942 ; 943 944 type_attribute_opt: 945 /* empty */ 946 | type_attribute 947 ; 948 949 type_attribute: /* See C11 6.7 declaration-specifiers */ 950 gcc_attribute_specifier 951 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 952 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 953 | T_PACKED { 954 dcs_add_packed(); 955 } 956 ; 957 958 begin_type: 959 /* empty */ { 960 dcs_begin_type(); 961 } 962 ; 963 964 end_type: 965 /* empty */ { 966 dcs_end_type(); 967 } 968 ; 969 970 type_specifier: /* C99 6.7.2 */ 971 notype_type_specifier 972 | T_TYPENAME { 973 $$ = getsym($1)->s_type; 974 } 975 ; 976 977 notype_type_specifier: /* see C99 6.7.2 */ 978 T_TYPE { 979 $$ = gettyp($1); 980 } 981 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 982 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 983 $$->t_typeof = true; 984 } 985 | atomic_type_specifier 986 | struct_or_union_specifier { 987 end_declaration_level(); 988 $$ = $1; 989 } 990 | enum_specifier { 991 end_declaration_level(); 992 $$ = $1; 993 } 994 ; 995 996 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 997 atomic_type_specifier: 998 atomic T_LPAREN type_name T_RPAREN { 999 $$ = $3; 1000 } 1001 ; 1002 1003 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1004 struct_or_union_specifier: 1005 struct_or_union identifier_sym { 1006 /* 1007 * STDC requires that "struct a;" always introduces 1008 * a new tag if "a" is not declared at current level 1009 * 1010 * yychar is valid because otherwise the parser would not 1011 * have been able to decide if it must shift or reduce 1012 */ 1013 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1014 } 1015 | struct_or_union identifier_sym { 1016 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1017 } braced_member_declaration_list { 1018 $$ = complete_struct_or_union($4); 1019 } 1020 | struct_or_union { 1021 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1022 } braced_member_declaration_list { 1023 $$ = complete_struct_or_union($3); 1024 } 1025 | struct_or_union error { 1026 set_symtyp(FVFT); 1027 $$ = gettyp(INT); 1028 } 1029 ; 1030 1031 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1032 struct_or_union: 1033 T_STRUCT_OR_UNION { 1034 set_symtyp(FTAG); 1035 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1036 dcs->d_sou_size_in_bits = 0; 1037 dcs->d_sou_align_in_bits = CHAR_SIZE; 1038 $$ = $1; 1039 } 1040 | struct_or_union type_attribute 1041 ; 1042 1043 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1044 member_declaration_lbrace member_declaration_list_with_rbrace { 1045 $$ = $2; 1046 } 1047 ; 1048 1049 member_declaration_lbrace: /* see C99 6.7.2.1 */ 1050 T_LBRACE { 1051 set_symtyp(FVFT); 1052 } 1053 ; 1054 1055 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1056 member_declaration_list T_RBRACE 1057 | T_RBRACE { 1058 /* XXX: This is not allowed by any C standard. */ 1059 $$ = NULL; 1060 } 1061 ; 1062 1063 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1064 /* Was named struct_declaration_list until C11. */ 1065 member_declaration_list: 1066 member_declaration 1067 | member_declaration_list member_declaration { 1068 $$ = concat_symbols($1, $2); 1069 } 1070 ; 1071 1072 /* Was named struct_declaration until C11. */ 1073 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1074 member_declaration: 1075 begin_type_qualifier_list end_type { 1076 /* ^^ There is no check for the missing type-specifier. */ 1077 /* too late, i know, but getsym() compensates it */ 1078 set_symtyp(FMEMBER); 1079 } notype_member_declarators T_SEMI { 1080 set_symtyp(FVFT); 1081 $$ = $4; 1082 } 1083 | begin_type_specifier_qualifier_list end_type { 1084 set_symtyp(FMEMBER); 1085 } type_member_declarators T_SEMI { 1086 set_symtyp(FVFT); 1087 $$ = $4; 1088 } 1089 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1090 /* syntax error '%s' */ 1091 error(249, "member without type"); 1092 $$ = NULL; 1093 } 1094 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1095 T_SEMI { 1096 set_symtyp(FVFT); 1097 if (!allow_c11 && !allow_gcc) 1098 /* anonymous struct/union members is a C11 feature */ 1099 warning(49); 1100 if (is_struct_or_union(dcs->d_type->t_tspec)) 1101 $$ = declare_unnamed_member(); 1102 else { 1103 /* syntax error '%s' */ 1104 error(249, "unnamed member"); 1105 $$ = NULL; 1106 } 1107 } 1108 | static_assert_declaration { 1109 $$ = NULL; 1110 } 1111 | error T_SEMI { 1112 set_symtyp(FVFT); 1113 $$ = NULL; 1114 } 1115 ; 1116 1117 /* Was named struct_declarators until C11. */ 1118 notype_member_declarators: 1119 notype_member_declarator { 1120 $$ = declare_member($1); 1121 } 1122 | notype_member_declarators { 1123 set_symtyp(FMEMBER); 1124 } T_COMMA type_member_declarator { 1125 $$ = concat_symbols($1, declare_member($4)); 1126 } 1127 ; 1128 1129 /* Was named struct_declarators until C11. */ 1130 type_member_declarators: 1131 type_member_declarator { 1132 $$ = declare_member($1); 1133 } 1134 | type_member_declarators { 1135 set_symtyp(FMEMBER); 1136 } T_COMMA type_member_declarator { 1137 $$ = concat_symbols($1, declare_member($4)); 1138 } 1139 ; 1140 1141 /* Was named struct_declarator until C11. */ 1142 notype_member_declarator: 1143 notype_declarator 1144 /* C99 6.7.2.1 */ 1145 | notype_declarator T_COLON constant_expression { 1146 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1147 } 1148 /* C99 6.7.2.1 */ 1149 | { 1150 set_symtyp(FVFT); 1151 } T_COLON constant_expression { 1152 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1153 } 1154 ; 1155 1156 /* Was named struct_declarator until C11. */ 1157 type_member_declarator: 1158 type_declarator 1159 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1160 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1161 } 1162 | { 1163 set_symtyp(FVFT); 1164 } T_COLON constant_expression type_attribute_list_opt { 1165 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1166 } 1167 ; 1168 1169 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1170 enum_specifier: 1171 enum gcc_attribute_specifier_list_opt identifier_sym { 1172 $$ = make_tag_type($3, ENUM, false, false); 1173 } 1174 | enum gcc_attribute_specifier_list_opt identifier_sym { 1175 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1176 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1177 $$ = complete_enum($5); 1178 } 1179 | enum gcc_attribute_specifier_list_opt { 1180 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1181 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1182 $$ = complete_enum($4); 1183 } 1184 | enum error { 1185 set_symtyp(FVFT); 1186 $$ = gettyp(INT); 1187 } 1188 ; 1189 1190 enum: /* helper for C99 6.7.2.2 */ 1191 T_ENUM { 1192 set_symtyp(FTAG); 1193 begin_declaration_level(DLK_ENUM); 1194 } 1195 ; 1196 1197 enum_declaration: /* helper for C99 6.7.2.2 */ 1198 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1199 $$ = $2; 1200 } 1201 ; 1202 1203 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1204 T_LBRACE { 1205 set_symtyp(FVFT); 1206 enumval = 0; 1207 } 1208 ; 1209 1210 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1211 enumerator_list 1212 | enumerator_list T_COMMA { 1213 if (!allow_c99 && !allow_trad) { 1214 /* trailing ',' in enum declaration requires C99 ... */ 1215 error(54); 1216 } else { 1217 /* trailing ',' in enum declaration requires C99 ... */ 1218 c99ism(54); 1219 } 1220 $$ = $1; 1221 } 1222 ; 1223 1224 enumerator_list: /* C99 6.7.2.2 */ 1225 enumerator 1226 | enumerator_list T_COMMA enumerator { 1227 $$ = concat_symbols($1, $3); 1228 } 1229 | error { 1230 $$ = NULL; 1231 } 1232 ; 1233 1234 enumerator: /* C99 6.7.2.2 */ 1235 identifier_sym gcc_attribute_specifier_list_opt { 1236 $$ = enumeration_constant($1, enumval, true); 1237 } 1238 | identifier_sym gcc_attribute_specifier_list_opt 1239 T_ASSIGN constant_expression { 1240 $$ = enumeration_constant($1, to_int_constant($4, true), 1241 false); 1242 } 1243 ; 1244 1245 type_qualifier: /* C99 6.7.3 */ 1246 T_QUAL 1247 | atomic { 1248 $$ = (type_qualifiers){ .tq_atomic = true }; 1249 } 1250 ; 1251 1252 atomic: /* helper */ 1253 T_ATOMIC { 1254 /* TODO: First fix c11ism, then use it here. */ 1255 if (!allow_c11) 1256 /* '_Atomic' requires C11 or later */ 1257 error(350); 1258 } 1259 ; 1260 1261 pointer: /* C99 6.7.5 */ 1262 T_ASTERISK type_qualifier_list_opt { 1263 $$ = xcalloc(1, sizeof(*$$)); 1264 add_type_qualifiers(&$$->qualifiers, $2); 1265 } 1266 | T_ASTERISK type_qualifier_list_opt pointer { 1267 $$ = xcalloc(1, sizeof(*$$)); 1268 add_type_qualifiers(&$$->qualifiers, $2); 1269 $$ = append_qualified_pointer($$, $3); 1270 } 1271 ; 1272 1273 type_qualifier_list_opt: /* see C99 6.7.5 */ 1274 /* empty */ { 1275 $$ = (type_qualifiers){ .tq_const = false }; 1276 } 1277 | type_qualifier_list 1278 ; 1279 1280 type_qualifier_list: /* C99 6.7.5 */ 1281 type_qualifier 1282 | type_qualifier_list type_qualifier { 1283 $$ = $1; 1284 add_type_qualifiers(&$$, $2); 1285 } 1286 ; 1287 1288 /* 1289 * For an explanation of 'notype' in the following rules, see 1290 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1291 */ 1292 1293 notype_init_declarators: 1294 notype_init_declarator 1295 | notype_init_declarators T_COMMA type_init_declarator 1296 ; 1297 1298 type_init_declarators: 1299 type_init_declarator 1300 | type_init_declarators T_COMMA type_init_declarator 1301 ; 1302 1303 notype_init_declarator: 1304 notype_declarator asm_or_symbolrename_opt { 1305 cgram_declare($1, false, $2); 1306 check_size($1); 1307 } 1308 | notype_declarator asm_or_symbolrename_opt { 1309 begin_initialization($1); 1310 cgram_declare($1, true, $2); 1311 } T_ASSIGN initializer { 1312 check_size($1); 1313 end_initialization(); 1314 } 1315 ; 1316 1317 type_init_declarator: 1318 type_declarator asm_or_symbolrename_opt { 1319 cgram_declare($1, false, $2); 1320 check_size($1); 1321 } 1322 | type_declarator asm_or_symbolrename_opt { 1323 begin_initialization($1); 1324 cgram_declare($1, true, $2); 1325 } T_ASSIGN initializer { 1326 check_size($1); 1327 end_initialization(); 1328 } 1329 ; 1330 1331 notype_declarator: 1332 notype_direct_declarator 1333 | pointer notype_direct_declarator { 1334 $$ = add_pointer($2, $1); 1335 } 1336 ; 1337 1338 type_declarator: 1339 type_direct_declarator 1340 | pointer type_direct_declarator { 1341 $$ = add_pointer($2, $1); 1342 } 1343 ; 1344 1345 notype_direct_declarator: 1346 type_attribute_list_opt T_NAME { 1347 $$ = declarator_name(getsym($2)); 1348 } 1349 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1350 $$ = $3; 1351 } 1352 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1353 $$ = add_array($1, $3.has_dim, $3.dim); 1354 } 1355 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1356 $$ = add_function(symbolrename($1, $3), $2); 1357 end_declaration_level(); 1358 block_level--; 1359 } 1360 | notype_direct_declarator type_attribute 1361 ; 1362 1363 type_direct_declarator: 1364 type_attribute_list_opt identifier { 1365 $$ = declarator_name(getsym($2)); 1366 } 1367 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1368 $$ = $3; 1369 } 1370 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1371 $$ = add_array($1, $3.has_dim, $3.dim); 1372 } 1373 | type_direct_declarator param_list asm_or_symbolrename_opt { 1374 $$ = add_function(symbolrename($1, $3), $2); 1375 end_declaration_level(); 1376 block_level--; 1377 } 1378 | type_direct_declarator type_attribute 1379 ; 1380 1381 /* 1382 * The two distinct rules type_param_declarator and notype_param_declarator 1383 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1384 * always treated as a typename, not an argument name. For example, after 1385 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1386 * "f(int (double));", not "f(int a);". 1387 */ 1388 type_param_declarator: 1389 direct_param_declarator 1390 | pointer direct_param_declarator { 1391 $$ = add_pointer($2, $1); 1392 } 1393 ; 1394 1395 notype_param_declarator: 1396 direct_notype_param_declarator 1397 | pointer direct_notype_param_declarator { 1398 $$ = add_pointer($2, $1); 1399 } 1400 ; 1401 1402 direct_param_declarator: 1403 identifier type_attribute_list { 1404 $$ = declarator_name(getsym($1)); 1405 } 1406 | identifier { 1407 $$ = declarator_name(getsym($1)); 1408 } 1409 | T_LPAREN notype_param_declarator T_RPAREN { 1410 $$ = $2; 1411 } 1412 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1413 gcc_attribute_specifier_list_opt { 1414 $$ = add_array($1, $3.has_dim, $3.dim); 1415 } 1416 | direct_param_declarator param_list asm_or_symbolrename_opt { 1417 $$ = add_function(symbolrename($1, $3), $2); 1418 end_declaration_level(); 1419 block_level--; 1420 } 1421 ; 1422 1423 direct_notype_param_declarator: 1424 identifier { 1425 $$ = declarator_name(getsym($1)); 1426 } 1427 | T_LPAREN notype_param_declarator T_RPAREN { 1428 $$ = $2; 1429 } 1430 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1431 $$ = add_array($1, $3.has_dim, $3.dim); 1432 } 1433 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1434 $$ = add_function(symbolrename($1, $3), $2); 1435 end_declaration_level(); 1436 block_level--; 1437 } 1438 ; 1439 1440 param_list: 1441 id_list_lparen identifier_list T_RPAREN { 1442 $$ = (struct parameter_list){ .first = $2 }; 1443 } 1444 | abstract_decl_param_list 1445 ; 1446 1447 id_list_lparen: 1448 T_LPAREN { 1449 block_level++; 1450 begin_declaration_level(DLK_PROTO_PARAMS); 1451 } 1452 ; 1453 1454 array_size_opt: 1455 /* empty */ { 1456 $$.has_dim = false; 1457 $$.dim = 0; 1458 } 1459 | T_ASTERISK { 1460 /* since C99; variable length array of unspecified size */ 1461 $$.has_dim = false; /* TODO: maybe change to true */ 1462 $$.dim = 0; /* just as a placeholder */ 1463 } 1464 | array_size { 1465 $$.has_dim = true; 1466 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1467 } 1468 ; 1469 1470 array_size: 1471 type_qualifier_list_opt T_SCLASS constant_expression { 1472 /* C11 6.7.6.3p7 */ 1473 if ($2 != STATIC) 1474 yyerror("Bad attribute"); 1475 /* static array size requires C11 or later */ 1476 c11ism(343); 1477 $$ = $3; 1478 } 1479 | type_qualifier { 1480 /* C11 6.7.6.2 */ 1481 if (!$1.tq_restrict) 1482 yyerror("Bad attribute"); 1483 $$ = NULL; 1484 } 1485 | constant_expression 1486 ; 1487 1488 identifier_list: /* C99 6.7.5 */ 1489 T_NAME { 1490 $$ = old_style_function_parameter_name(getsym($1)); 1491 } 1492 | identifier_list T_COMMA T_NAME { 1493 $$ = concat_symbols($1, 1494 old_style_function_parameter_name(getsym($3))); 1495 } 1496 | identifier_list error 1497 ; 1498 1499 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1500 type_name: /* C99 6.7.6 */ 1501 { 1502 begin_declaration_level(DLK_ABSTRACT); 1503 } abstract_declaration { 1504 end_declaration_level(); 1505 $$ = $2->s_type; 1506 } 1507 ; 1508 1509 abstract_declaration: /* specific to lint */ 1510 begin_type_qualifier_list end_type { 1511 $$ = declare_abstract_type(abstract_name()); 1512 } 1513 | begin_type_specifier_qualifier_list end_type { 1514 $$ = declare_abstract_type(abstract_name()); 1515 } 1516 | begin_type_qualifier_list end_type abstract_declarator { 1517 $$ = declare_abstract_type($3); 1518 } 1519 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1520 $$ = declare_abstract_type($3); 1521 } 1522 ; 1523 1524 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1525 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1526 abstract_declarator: 1527 pointer { 1528 $$ = add_pointer(abstract_name(), $1); 1529 } 1530 | direct_abstract_declarator 1531 | pointer direct_abstract_declarator { 1532 $$ = add_pointer($2, $1); 1533 } 1534 | type_attribute_list direct_abstract_declarator { 1535 $$ = $2; 1536 } 1537 | pointer type_attribute_list direct_abstract_declarator { 1538 $$ = add_pointer($3, $1); 1539 } 1540 ; 1541 1542 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1543 direct_abstract_declarator: 1544 /* TODO: sort rules according to C99 */ 1545 T_LPAREN abstract_declarator T_RPAREN { 1546 $$ = $2; 1547 } 1548 | T_LBRACK array_size_opt T_RBRACK { 1549 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1550 } 1551 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1552 $$ = add_array($1, $3.has_dim, $3.dim); 1553 } 1554 | abstract_decl_param_list asm_or_symbolrename_opt { 1555 sym_t *name = abstract_enclosing_name(); 1556 $$ = add_function(symbolrename(name, $2), $1); 1557 end_declaration_level(); 1558 block_level--; 1559 } 1560 | direct_abstract_declarator abstract_decl_param_list 1561 asm_or_symbolrename_opt { 1562 $$ = add_function(symbolrename($1, $3), $2); 1563 end_declaration_level(); 1564 block_level--; 1565 } 1566 | direct_abstract_declarator type_attribute_list 1567 ; 1568 1569 abstract_decl_param_list: /* specific to lint */ 1570 abstract_decl_lparen T_RPAREN type_attribute_opt { 1571 $$ = (struct parameter_list){ .first = NULL }; 1572 } 1573 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1574 type_attribute_opt { 1575 $$ = $2; 1576 $$.prototype = true; 1577 } 1578 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1579 $$ = (struct parameter_list){ .first = NULL }; 1580 } 1581 ; 1582 1583 abstract_decl_lparen: /* specific to lint */ 1584 T_LPAREN { 1585 block_level++; 1586 begin_declaration_level(DLK_PROTO_PARAMS); 1587 } 1588 ; 1589 1590 vararg_parameter_type_list: /* specific to lint */ 1591 parameter_type_list 1592 | parameter_type_list T_COMMA T_ELLIPSIS { 1593 $$ = $1; 1594 $$.vararg = true; 1595 } 1596 | T_ELLIPSIS { 1597 /* TODO: C99 6.7.5 makes this an error as well. */ 1598 if (!allow_trad && !allow_c99) { 1599 /* C90 to C17 require formal parameter before '...' */ 1600 error(84); 1601 } else if (allow_c90) { 1602 /* C90 to C17 require formal parameter before '...' */ 1603 warning(84); 1604 } 1605 $$ = (struct parameter_list){ .vararg = true }; 1606 } 1607 ; 1608 1609 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1610 parameter_type_list: 1611 parameter_declaration { 1612 $$ = (struct parameter_list){ .first = $1 }; 1613 } 1614 | parameter_type_list T_COMMA parameter_declaration { 1615 $$ = $1; 1616 $$.first = concat_symbols($1.first, $3); 1617 } 1618 ; 1619 1620 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1621 parameter_declaration: 1622 begin_type_declmods end_type { 1623 /* ^^ There is no check for the missing type-specifier. */ 1624 $$ = declare_parameter(abstract_name(), false); 1625 } 1626 | begin_type_declaration_specifiers end_type { 1627 $$ = declare_parameter(abstract_name(), false); 1628 } 1629 | begin_type_declmods end_type notype_param_declarator { 1630 /* ^^ There is no check for the missing type-specifier. */ 1631 $$ = declare_parameter($3, false); 1632 } 1633 /* 1634 * type_param_declarator is needed because of following conflict: 1635 * "typedef int a; f(int (a));" could be parsed as 1636 * "function with argument a of type int", or 1637 * "function with an unnamed (abstract) argument of type function". 1638 * This grammar realizes the second case. 1639 */ 1640 | begin_type_declaration_specifiers end_type type_param_declarator { 1641 $$ = declare_parameter($3, false); 1642 } 1643 | begin_type_declmods end_type abstract_declarator { 1644 /* ^^ There is no check for the missing type-specifier. */ 1645 $$ = declare_parameter($3, false); 1646 } 1647 | begin_type_declaration_specifiers end_type abstract_declarator { 1648 $$ = declare_parameter($3, false); 1649 } 1650 ; 1651 1652 braced_initializer: 1653 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1654 init_lbrace init_rbrace { 1655 /* empty initializer braces require C23 or later */ 1656 c23ism(353); 1657 } 1658 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1659 | init_lbrace initializer_list comma_opt init_rbrace 1660 ; 1661 1662 initializer: /* C99 6.7.8 "Initialization" */ 1663 assignment_expression { 1664 init_expr($1); 1665 } 1666 | init_lbrace init_rbrace { 1667 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1668 } 1669 | init_lbrace initializer_list comma_opt init_rbrace 1670 /* XXX: What is this error handling for? */ 1671 | error 1672 ; 1673 1674 initializer_list: /* C99 6.7.8 "Initialization" */ 1675 initializer_list_item 1676 | initializer_list T_COMMA initializer_list_item 1677 ; 1678 1679 initializer_list_item: /* helper */ 1680 designation initializer 1681 | initializer 1682 ; 1683 1684 designation: /* C99 6.7.8 "Initialization" */ 1685 begin_designation designator_list T_ASSIGN 1686 | identifier T_COLON { 1687 /* GCC style struct or union member name in initializer */ 1688 gnuism(315); 1689 begin_designation(); 1690 add_designator_member($1); 1691 } 1692 ; 1693 1694 begin_designation: /* lint-specific helper */ 1695 /* empty */ { 1696 begin_designation(); 1697 } 1698 ; 1699 1700 designator_list: /* C99 6.7.8 "Initialization" */ 1701 designator 1702 | designator_list designator 1703 ; 1704 1705 designator: /* C99 6.7.8 "Initialization" */ 1706 T_LBRACK range T_RBRACK { 1707 if (!allow_c99) 1708 /* array initializer with designators is a C99 ... */ 1709 warning(321); 1710 add_designator_subscript($2); 1711 } 1712 | T_POINT identifier { 1713 if (!allow_c99) 1714 /* struct or union member name in initializer is ... */ 1715 warning(313); 1716 add_designator_member($2); 1717 } 1718 ; 1719 1720 static_assert_declaration: 1721 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1722 T_RPAREN T_SEMI { 1723 /* '_Static_assert' requires C11 or later */ 1724 c11ism(354); 1725 } 1726 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1727 /* '_Static_assert' without message requires C23 or later */ 1728 c23ism(355); 1729 } 1730 ; 1731 1732 range: 1733 constant_expression { 1734 $$.lo = to_int_constant($1, true); 1735 $$.hi = $$.lo; 1736 } 1737 | constant_expression T_ELLIPSIS constant_expression { 1738 $$.lo = to_int_constant($1, true); 1739 $$.hi = to_int_constant($3, true); 1740 /* initialization with '[a...b]' is a GCC extension */ 1741 gnuism(340); 1742 } 1743 ; 1744 1745 init_lbrace: /* helper */ 1746 T_LBRACE { 1747 init_lbrace(); 1748 } 1749 ; 1750 1751 init_rbrace: /* helper */ 1752 T_RBRACE { 1753 init_rbrace(); 1754 } 1755 ; 1756 1757 asm_or_symbolrename_opt: /* GCC extensions */ 1758 /* empty */ { 1759 $$ = NULL; 1760 } 1761 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1762 freeyyv(&$3, T_STRING); 1763 $$ = NULL; 1764 } 1765 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1766 gcc_attribute_specifier_list_opt { 1767 $$ = $3; 1768 } 1769 ; 1770 1771 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1772 statement: 1773 expression_statement 1774 | non_expr_statement 1775 ; 1776 1777 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1778 no_attr_statement: 1779 expression_statement 1780 | no_attr_non_expr_statement 1781 ; 1782 1783 non_expr_statement: /* helper for C99 6.8 */ 1784 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1785 | no_attr_non_expr_statement 1786 ; 1787 1788 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1789 no_attr_non_expr_statement: 1790 labeled_statement 1791 | compound_statement 1792 | selection_statement 1793 | iteration_statement 1794 | jump_statement { 1795 suppress_fallthrough = false; 1796 } 1797 | asm_statement 1798 ; 1799 1800 labeled_statement: /* C99 6.8.1 */ 1801 label gcc_attribute_specifier_list_opt no_attr_statement 1802 ; 1803 1804 label: 1805 T_NAME T_COLON { 1806 set_symtyp(FLABEL); 1807 named_label(getsym($1)); 1808 } 1809 | T_CASE constant_expression T_COLON { 1810 case_label($2); 1811 suppress_fallthrough = true; 1812 } 1813 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1814 /* XXX: We don't fill all cases */ 1815 case_label($2); 1816 suppress_fallthrough = true; 1817 } 1818 | T_DEFAULT T_COLON { 1819 default_label(); 1820 suppress_fallthrough = true; 1821 } 1822 ; 1823 1824 compound_statement: /* C99 6.8.2 */ 1825 compound_statement_lbrace compound_statement_rbrace 1826 | compound_statement_lbrace block_item_list compound_statement_rbrace 1827 ; 1828 1829 compound_statement_lbrace: 1830 T_LBRACE { 1831 block_level++; 1832 mem_block_level++; 1833 debug_step("%s: mem_block_level = %zu", 1834 "compound_statement_lbrace", mem_block_level); 1835 begin_declaration_level(DLK_AUTO); 1836 } 1837 ; 1838 1839 compound_statement_rbrace: 1840 T_RBRACE { 1841 end_declaration_level(); 1842 if (!in_statement_expr()) 1843 level_free_all(mem_block_level); /* leak */ 1844 mem_block_level--; 1845 debug_step("%s: mem_block_level = %zu", 1846 "compound_statement_rbrace", mem_block_level); 1847 block_level--; 1848 suppress_fallthrough = false; 1849 } 1850 ; 1851 1852 block_item_list: /* C99 6.8.2 */ 1853 block_item 1854 | block_item_list block_item { 1855 if ($1 && !$2) 1856 /* declarations after statements is a C99 feature */ 1857 c99ism(327); 1858 $$ = $1 || $2; 1859 } 1860 ; 1861 1862 block_item: /* C99 6.8.2 */ 1863 declaration_or_error { 1864 $$ = false; 1865 restore_warning_flags(); 1866 } 1867 | statement { 1868 $$ = true; 1869 restore_warning_flags(); 1870 } 1871 ; 1872 1873 expression_statement: /* C99 6.8.3 */ 1874 expression T_SEMI { 1875 expr($1, false, false, false, false); 1876 suppress_fallthrough = false; 1877 } 1878 | T_SEMI { 1879 check_statement_reachable(); 1880 suppress_fallthrough = false; 1881 } 1882 ; 1883 1884 selection_statement: /* C99 6.8.4 */ 1885 if_without_else %prec T_THEN { 1886 save_warning_flags(); 1887 stmt_if_then_stmt(); 1888 stmt_if_else_stmt(false); 1889 } 1890 | if_without_else T_ELSE { 1891 save_warning_flags(); 1892 stmt_if_then_stmt(); 1893 } statement { 1894 clear_warning_flags(); 1895 stmt_if_else_stmt(true); 1896 } 1897 | if_without_else T_ELSE error { 1898 clear_warning_flags(); 1899 stmt_if_else_stmt(false); 1900 } 1901 | switch_expr statement { 1902 clear_warning_flags(); 1903 stmt_switch_expr_stmt(); 1904 } 1905 | switch_expr error { 1906 clear_warning_flags(); 1907 stmt_switch_expr_stmt(); 1908 } 1909 ; 1910 1911 if_without_else: /* see C99 6.8.4 */ 1912 if_expr statement 1913 | if_expr error 1914 ; 1915 1916 if_expr: /* see C99 6.8.4 */ 1917 T_IF T_LPAREN expression T_RPAREN { 1918 stmt_if_expr($3); 1919 clear_warning_flags(); 1920 } 1921 ; 1922 1923 switch_expr: /* see C99 6.8.4 */ 1924 T_SWITCH T_LPAREN expression T_RPAREN { 1925 stmt_switch_expr($3); 1926 clear_warning_flags(); 1927 } 1928 ; 1929 1930 iteration_statement: /* C99 6.8.5 */ 1931 while_expr statement { 1932 clear_warning_flags(); 1933 stmt_while_expr_stmt(); 1934 } 1935 | while_expr error { 1936 clear_warning_flags(); 1937 stmt_while_expr_stmt(); 1938 } 1939 | do_statement do_while_expr { 1940 stmt_do_while_expr($2); 1941 suppress_fallthrough = false; 1942 } 1943 | do error { 1944 clear_warning_flags(); 1945 stmt_do_while_expr(NULL); 1946 } 1947 | for_exprs statement { 1948 clear_warning_flags(); 1949 stmt_for_exprs_stmt(); 1950 end_declaration_level(); 1951 block_level--; 1952 } 1953 | for_exprs error { 1954 clear_warning_flags(); 1955 stmt_for_exprs_stmt(); 1956 end_declaration_level(); 1957 block_level--; 1958 } 1959 ; 1960 1961 while_expr: /* see C99 6.8.5 */ 1962 T_WHILE T_LPAREN expression T_RPAREN { 1963 stmt_while_expr($3); 1964 clear_warning_flags(); 1965 } 1966 ; 1967 1968 do_statement: /* see C99 6.8.5 */ 1969 do statement { 1970 clear_warning_flags(); 1971 } 1972 ; 1973 1974 do: /* see C99 6.8.5 */ 1975 T_DO { 1976 stmt_do(); 1977 } 1978 ; 1979 1980 do_while_expr: /* see C99 6.8.5 */ 1981 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1982 $$ = $3; 1983 } 1984 ; 1985 1986 for_start: /* see C99 6.8.5 */ 1987 T_FOR T_LPAREN { 1988 begin_declaration_level(DLK_AUTO); 1989 block_level++; 1990 } 1991 ; 1992 1993 for_exprs: /* see C99 6.8.5 */ 1994 for_start 1995 begin_type_declaration_specifiers end_type 1996 notype_init_declarators T_SEMI 1997 expression_opt T_SEMI 1998 expression_opt T_RPAREN { 1999 /* variable declaration in for loop */ 2000 c99ism(325); 2001 stmt_for_exprs(NULL, $6, $8); 2002 clear_warning_flags(); 2003 } 2004 | for_start 2005 expression_opt T_SEMI 2006 expression_opt T_SEMI 2007 expression_opt T_RPAREN { 2008 stmt_for_exprs($2, $4, $6); 2009 clear_warning_flags(); 2010 } 2011 ; 2012 2013 jump_statement: /* C99 6.8.6 */ 2014 goto identifier T_SEMI { 2015 stmt_goto(getsym($2)); 2016 } 2017 | goto error T_SEMI { 2018 set_symtyp(FVFT); 2019 } 2020 | T_CONTINUE T_SEMI { 2021 stmt_continue(); 2022 } 2023 | T_BREAK T_SEMI { 2024 stmt_break(); 2025 } 2026 | T_RETURN sys T_SEMI { 2027 stmt_return($2, NULL); 2028 } 2029 | T_RETURN sys expression T_SEMI { 2030 stmt_return($2, $3); 2031 } 2032 ; 2033 2034 goto: /* see C99 6.8.6 */ 2035 T_GOTO { 2036 set_symtyp(FLABEL); 2037 } 2038 ; 2039 2040 asm_statement: /* GCC extension */ 2041 T_ASM T_LPAREN read_until_rparen T_SEMI { 2042 dcs_set_asm(); 2043 } 2044 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2045 dcs_set_asm(); 2046 } 2047 | T_ASM error 2048 ; 2049 2050 read_until_rparen: /* helper for 'asm_statement' */ 2051 /* empty */ { 2052 read_until_rparen(); 2053 } 2054 ; 2055 2056 translation_unit: /* C99 6.9 */ 2057 external_declaration 2058 | translation_unit external_declaration 2059 ; 2060 2061 external_declaration: /* C99 6.9 */ 2062 function_definition { 2063 global_clean_up_decl(false); 2064 clear_warning_flags(); 2065 } 2066 | top_level_declaration { 2067 global_clean_up_decl(false); 2068 clear_warning_flags(); 2069 } 2070 | asm_statement /* GCC extension */ 2071 | T_SEMI { /* GCC extension */ 2072 /* 2073 * TODO: Only allow this in GCC mode, not in plain C99. 2074 * This is one of the top 10 warnings in the NetBSD build. 2075 */ 2076 if (!allow_trad && !allow_c99) { 2077 /* empty declaration */ 2078 error(0); 2079 } else if (allow_c90) { 2080 /* empty declaration */ 2081 warning(0); 2082 } 2083 } 2084 ; 2085 2086 /* 2087 * On the top level, lint allows several forms of declarations that it doesn't 2088 * allow in functions. For example, a single ';' is an empty declaration and 2089 * is supported by some compilers, but in a function it would be an empty 2090 * statement, not a declaration. This makes a difference in C90 mode, where 2091 * a statement must not be followed by a declaration. 2092 * 2093 * See 'declaration' for all other declarations. 2094 */ 2095 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2096 begin_type end_type notype_init_declarators T_SEMI { 2097 /* TODO: Make this an error in C99 mode as well. */ 2098 if (!allow_trad && !allow_c99) { 2099 /* old-style declaration; add 'int' */ 2100 error(1); 2101 } else if (allow_c90) { 2102 /* old-style declaration; add 'int' */ 2103 warning(1); 2104 } 2105 } 2106 | declaration 2107 | error T_SEMI { 2108 global_clean_up(); 2109 } 2110 | error T_RBRACE { 2111 global_clean_up(); 2112 } 2113 ; 2114 2115 function_definition: /* C99 6.9.1 */ 2116 func_declarator { 2117 if ($1->s_type->t_tspec != FUNC) { 2118 /* syntax error '%s' */ 2119 error(249, yytext); 2120 YYERROR; 2121 } 2122 if ($1->s_type->t_typedef) { 2123 /* ()-less function definition */ 2124 error(64); 2125 YYERROR; 2126 } 2127 check_extern_declaration($1); 2128 begin_function($1); 2129 block_level++; 2130 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2131 if (lwarn == LWARN_NONE) 2132 $1->s_used = true; 2133 } arg_declaration_list_opt { 2134 end_declaration_level(); 2135 block_level--; 2136 check_func_lint_directives(); 2137 check_func_old_style_parameters(); 2138 begin_control_statement(CS_FUNCTION_BODY); 2139 } compound_statement { 2140 end_function(); 2141 end_control_statement(CS_FUNCTION_BODY); 2142 } 2143 ; 2144 2145 func_declarator: 2146 begin_type end_type notype_declarator { 2147 if (!allow_trad) { 2148 /* old-style declaration; add 'int' */ 2149 error(1); 2150 } 2151 $$ = $3; 2152 } 2153 | begin_type_declmods end_type notype_declarator { 2154 if (!allow_trad) { 2155 /* old-style declaration; add 'int' */ 2156 error(1); 2157 } 2158 $$ = $3; 2159 } 2160 | begin_type_declaration_specifiers end_type type_declarator { 2161 $$ = $3; 2162 } 2163 ; 2164 2165 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2166 /* empty */ 2167 | arg_declaration_list 2168 ; 2169 2170 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2171 arg_declaration 2172 | arg_declaration_list arg_declaration 2173 /* XXX or better "arg_declaration error" ? */ 2174 | error 2175 ; 2176 2177 /* 2178 * "arg_declaration" is separated from "declaration" because it 2179 * needs other error handling. 2180 */ 2181 arg_declaration: 2182 begin_type_declmods end_type T_SEMI { 2183 /* empty declaration */ 2184 warning(2); 2185 } 2186 | begin_type_declmods end_type notype_init_declarators T_SEMI 2187 | begin_type_declaration_specifiers end_type T_SEMI { 2188 if (!dcs->d_nonempty_decl) { 2189 /* empty declaration */ 2190 warning(2); 2191 } else { 2192 /* '%s' declared in parameter declaration list */ 2193 warning(3, type_name(dcs->d_type)); 2194 } 2195 } 2196 | begin_type_declaration_specifiers end_type 2197 type_init_declarators T_SEMI { 2198 if (dcs->d_nonempty_decl) { 2199 /* '%s' declared in parameter declaration list */ 2200 warning(3, type_name(dcs->d_type)); 2201 } 2202 } 2203 | begin_type_declmods error 2204 | begin_type_declaration_specifiers error 2205 ; 2206 2207 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2208 gcc_attribute_specifier_list_opt: 2209 /* empty */ 2210 | gcc_attribute_specifier_list 2211 ; 2212 2213 gcc_attribute_specifier_list: 2214 gcc_attribute_specifier 2215 | gcc_attribute_specifier_list gcc_attribute_specifier 2216 ; 2217 2218 gcc_attribute_specifier: 2219 T_ATTRIBUTE T_LPAREN T_LPAREN { 2220 in_gcc_attribute = true; 2221 } gcc_attribute_list { 2222 in_gcc_attribute = false; 2223 } T_RPAREN T_RPAREN 2224 ; 2225 2226 gcc_attribute_list: 2227 gcc_attribute 2228 | gcc_attribute_list T_COMMA gcc_attribute 2229 ; 2230 2231 gcc_attribute: 2232 /* empty */ 2233 | T_NAME { 2234 const char *name = $1->sb_name; 2235 if (is_either(name, "packed", "__packed__")) 2236 dcs_add_packed(); 2237 else if (is_either(name, "used", "__used__") || 2238 is_either(name, "unused", "__unused__")) 2239 dcs_set_used(); 2240 else if (is_either(name, "fallthrough", "__fallthrough__")) 2241 suppress_fallthrough = true; 2242 } 2243 | T_NAME T_LPAREN T_RPAREN 2244 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2245 | type_qualifier { 2246 if (!$1.tq_const) 2247 yyerror("Bad attribute"); 2248 } 2249 ; 2250 2251 gcc_attribute_parameters: 2252 constant_expression 2253 | gcc_attribute_parameters T_COMMA constant_expression 2254 ; 2255 2256 sys: 2257 /* empty */ { 2258 $$ = in_system_header; 2259 } 2260 ; 2261 2262 %% 2263 2264 /* ARGSUSED */ 2265 int 2266 yyerror(const char *msg) 2267 { 2268 /* syntax error '%s' */ 2269 error(249, yytext); 2270 if (++sytxerr >= 5) 2271 norecover(); 2272 return 0; 2273 } 2274 2275 #if YYDEBUG && YYBYACC 2276 static const char * 2277 cgram_to_string(int token, YYSTYPE val) 2278 { 2279 2280 switch (token) { 2281 case T_INCDEC: 2282 return val.y_inc ? "++" : "--"; 2283 case T_MULTIPLICATIVE: 2284 case T_ADDITIVE: 2285 case T_SHIFT: 2286 case T_RELATIONAL: 2287 case T_EQUALITY: 2288 case T_OPASSIGN: 2289 return op_name(val.y_op); 2290 case T_SCLASS: 2291 return scl_name(val.y_scl); 2292 case T_TYPE: 2293 case T_STRUCT_OR_UNION: 2294 return tspec_name(val.y_tspec); 2295 case T_QUAL: 2296 return type_qualifiers_string(val.y_type_qualifiers); 2297 case T_FUNCTION_SPECIFIER: 2298 return function_specifier_name(val.y_function_specifier); 2299 case T_NAME: 2300 return val.y_name->sb_name; 2301 default: 2302 return "<none>"; 2303 } 2304 } 2305 #endif 2306 2307 static void 2308 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2309 { 2310 declare(decl, has_initializer, renaming); 2311 if (renaming != NULL) 2312 freeyyv(&renaming, T_NAME); 2313 } 2314 2315 /* 2316 * Discard all input tokens up to and including the next unmatched right 2317 * parenthesis. 2318 */ 2319 static void 2320 read_until_rparen(void) 2321 { 2322 int level; 2323 2324 if (yychar < 0) 2325 yychar = yylex(); 2326 freeyyv(&yylval, yychar); 2327 2328 level = 1; 2329 while (yychar > 0) { 2330 if (yychar == T_LPAREN) 2331 level++; 2332 if (yychar == T_RPAREN && --level == 0) 2333 break; 2334 freeyyv(&yylval, yychar = yylex()); 2335 } 2336 2337 yyclearin; 2338 } 2339 2340 static sym_t * 2341 symbolrename(sym_t *s, sbuf_t *sb) 2342 { 2343 if (sb != NULL) 2344 s->s_rename = sb->sb_name; 2345 return s; 2346 } 2347
Indexes created Thu Oct 02 10:09:58 GMT 2025