cgram.y revision 1.482
1 %{ 2 /* $NetBSD: cgram.y,v 1.482 2024/01/13 01:23:39 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 1.482 2024/01/13 01:23:39 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 %type <y_sym> member_declaration_list_with_rbrace 332 %type <y_sym> member_declaration_list 333 %type <y_sym> member_declaration 334 %type <y_sym> notype_member_declarators 335 %type <y_sym> type_member_declarators 336 %type <y_sym> notype_member_declarator 337 %type <y_sym> type_member_declarator 338 %type <y_type> enum_specifier 339 /* No type for enum. */ 340 %type <y_sym> enum_declaration 341 %type <y_sym> enums_with_opt_comma 342 %type <y_sym> enumerator_list 343 %type <y_sym> enumerator 344 %type <y_type_qualifiers> type_qualifier 345 /* No type for atomic. */ 346 %type <y_qual_ptr> pointer 347 %type <y_type_qualifiers> type_qualifier_list_opt 348 %type <y_type_qualifiers> type_qualifier_list 349 /* No type for notype_init_declarators. */ 350 /* No type for type_init_declarators. */ 351 /* No type for notype_init_declarator. */ 352 /* No type for type_init_declarator. */ 353 %type <y_sym> notype_declarator 354 %type <y_sym> type_declarator 355 %type <y_sym> notype_direct_declarator 356 %type <y_sym> type_direct_declarator 357 %type <y_sym> type_param_declarator 358 %type <y_sym> notype_param_declarator 359 %type <y_sym> direct_param_declarator 360 %type <y_sym> direct_notype_param_declarator 361 %type <y_parameter_list> param_list 362 %type <y_array_size> array_size_opt 363 %type <y_sym> identifier_list 364 %type <y_type> type_name 365 %type <y_sym> abstract_declaration 366 %type <y_sym> abstract_declarator 367 %type <y_sym> direct_abstract_declarator 368 %type <y_parameter_list> abstract_decl_param_list 369 /* No type for abstract_decl_lparen. */ 370 %type <y_parameter_list> vararg_parameter_type_list 371 %type <y_parameter_list> parameter_type_list 372 %type <y_sym> parameter_declaration 373 /* No type for braced_initializer. */ 374 /* No type for initializer. */ 375 /* No type for initializer_list. */ 376 /* No type for initializer_list_item. */ 377 /* No type for designation. */ 378 /* No type for designator_list. */ 379 /* No type for designator. */ 380 /* No type for static_assert_declaration. */ 381 %type <y_range> range 382 /* No type for init_lbrace. */ 383 /* No type for init_rbrace. */ 384 %type <y_name> asm_or_symbolrename_opt 385 /* No type for statement. */ 386 /* No type for no_attr_statement. */ 387 /* No type for non_expr_statement. */ 388 /* No type for no_attr_non_expr_statement. */ 389 /* No type for labeled_statement. */ 390 /* No type for label. */ 391 /* No type for compound_statement. */ 392 /* No type for compound_statement_lbrace. */ 393 /* No type for compound_statement_rbrace. */ 394 %type <y_seen_statement> block_item_list 395 %type <y_seen_statement> block_item 396 /* No type for expression_statement. */ 397 /* No type for selection_statement. */ 398 /* No type for if_without_else. */ 399 /* No type for if_expr. */ 400 /* No type for switch_expr. */ 401 /* No type for iteration_statement. */ 402 /* No type for while_expr. */ 403 /* No type for do_statement. */ 404 /* No type for do. */ 405 /* No type for for_start. */ 406 /* No type for for_exprs. */ 407 /* No type for jump_statement. */ 408 /* No type for goto. */ 409 /* No type for asm_statement. */ 410 /* No type for read_until_rparen. */ 411 /* No type for translation_unit. */ 412 /* No type for external_declaration. */ 413 /* No type for top_level_declaration. */ 414 /* No type for function_definition. */ 415 %type <y_sym> func_declarator 416 /* No type for arg_declaration_list_opt. */ 417 /* No type for arg_declaration_list. */ 418 /* No type for arg_declaration. */ 419 /* No type for gcc_attribute_specifier_list_opt. */ 420 /* No type for gcc_attribute_specifier_list. */ 421 /* No type for gcc_attribute_specifier. */ 422 /* No type for gcc_attribute_list. */ 423 /* No type for gcc_attribute. */ 424 /* No type for gcc_attribute_parameters. */ 425 %type <y_in_system_header> sys 426 427 %% 428 429 program: 430 /* empty */ { 431 /* TODO: Make this an error in C99 mode as well. */ 432 if (!allow_trad && !allow_c99) { 433 /* empty translation unit */ 434 error(272); 435 } else if (allow_c90) { 436 /* empty translation unit */ 437 warning(272); 438 } 439 } 440 | translation_unit 441 ; 442 443 identifier_sym: /* helper for struct/union/enum */ 444 identifier { 445 $$ = getsym($1); 446 } 447 ; 448 449 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 450 identifier: 451 T_NAME { 452 debug_step("cgram: name '%s'", $1->sb_name); 453 $$ = $1; 454 } 455 | T_TYPENAME { 456 debug_step("cgram: typename '%s'", $1->sb_name); 457 $$ = $1; 458 } 459 ; 460 461 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 462 string: 463 T_STRING 464 | string T_STRING { 465 if (!allow_c90) { 466 /* concatenated strings are illegal in traditional C */ 467 warning(219); 468 } 469 $$ = cat_strings($1, $2); 470 } 471 ; 472 473 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 474 primary_expression: 475 T_NAME { 476 bool sys_name, sys_next; 477 sys_name = in_system_header; 478 if (yychar < 0) 479 yychar = yylex(); 480 sys_next = in_system_header; 481 in_system_header = sys_name; 482 $$ = build_name(getsym($1), yychar == T_LPAREN); 483 in_system_header = sys_next; 484 } 485 | T_CON { 486 $$ = build_constant(gettyp($1->v_tspec), $1); 487 } 488 | string { 489 $$ = build_string($1); 490 } 491 | T_LPAREN expression T_RPAREN { 492 if ($2 != NULL) 493 $2->tn_parenthesized = true; 494 $$ = $2; 495 } 496 | generic_selection 497 /* GCC primary-expression, see c_parser_postfix_expression */ 498 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 499 set_symtyp(FMEMBER); 500 } member_designator T_RPAREN { 501 $$ = build_offsetof($3, $6); 502 } 503 ; 504 505 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 506 member_designator: 507 identifier { 508 $$ = (designation) { .dn_len = 0 }; 509 designation_push(&$$, DK_MEMBER, getsym($1), 0); 510 } 511 | member_designator T_LBRACK range T_RBRACK { 512 $$ = $1; 513 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 514 } 515 | member_designator T_POINT { 516 set_symtyp(FMEMBER); 517 } identifier { 518 $$ = $1; 519 designation_push(&$$, DK_MEMBER, getsym($4), 0); 520 } 521 ; 522 523 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 524 generic_selection: 525 T_GENERIC T_LPAREN assignment_expression T_COMMA 526 generic_assoc_list T_RPAREN { 527 /* generic selection requires C11 or later */ 528 c11ism(345); 529 $$ = build_generic_selection($3, $5); 530 } 531 ; 532 533 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 534 generic_assoc_list: 535 generic_association 536 | generic_assoc_list T_COMMA generic_association { 537 $3->ga_prev = $1; 538 $$ = $3; 539 } 540 ; 541 542 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 543 generic_association: 544 type_name T_COLON assignment_expression { 545 $$ = block_zero_alloc(sizeof(*$$), "generic"); 546 $$->ga_arg = $1; 547 $$->ga_result = $3; 548 } 549 | T_DEFAULT T_COLON assignment_expression { 550 $$ = block_zero_alloc(sizeof(*$$), "generic"); 551 $$->ga_arg = NULL; 552 $$->ga_result = $3; 553 } 554 ; 555 556 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 557 postfix_expression: 558 primary_expression 559 | postfix_expression T_LBRACK sys expression T_RBRACK { 560 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 561 } 562 | postfix_expression T_LPAREN sys T_RPAREN { 563 $$ = build_function_call($1, $3, NULL); 564 } 565 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 566 $$ = build_function_call($1, $3, $4); 567 } 568 | postfix_expression point_or_arrow sys T_NAME { 569 $$ = build_member_access($1, $2, $3, $4); 570 } 571 | postfix_expression T_INCDEC sys { 572 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 573 } 574 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 575 sym_t *tmp = mktempsym($2); 576 begin_initialization(tmp); 577 cgram_declare(tmp, true, NULL); 578 } braced_initializer { 579 if (!allow_c99) 580 /* compound literals are a C99/GCC extension */ 581 gnuism(319); 582 $$ = build_name(current_initsym(), false); 583 end_initialization(); 584 } 585 | T_LPAREN compound_statement_lbrace { 586 begin_statement_expr(); 587 } gcc_statement_expr_list { 588 do_statement_expr($4); 589 } compound_statement_rbrace T_RPAREN { 590 $$ = end_statement_expr(); 591 } 592 ; 593 594 comma_opt: /* helper for 'postfix_expression' */ 595 /* empty */ 596 | T_COMMA 597 ; 598 599 /* 600 * The inner part of a GCC statement-expression of the form ({ ... }). 601 * 602 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 603 */ 604 gcc_statement_expr_list: 605 gcc_statement_expr_item 606 | gcc_statement_expr_list gcc_statement_expr_item { 607 $$ = $2; 608 } 609 ; 610 611 gcc_statement_expr_item: 612 declaration_or_error { 613 clear_warning_flags(); 614 $$ = NULL; 615 } 616 | non_expr_statement { 617 $$ = expr_alloc_tnode(); 618 $$->tn_type = gettyp(VOID); 619 } 620 | T_SEMI { 621 $$ = expr_alloc_tnode(); 622 $$->tn_type = gettyp(VOID); 623 } 624 | expression T_SEMI { 625 if ($1 == NULL) { /* in case of syntax errors */ 626 $$ = expr_alloc_tnode(); 627 $$->tn_type = gettyp(VOID); 628 } else { 629 /* XXX: do that only on the last name */ 630 if ($1->tn_op == NAME) 631 $1->tn_sym->s_used = true; 632 expr($1, false, false, false, false); 633 suppress_fallthrough = false; 634 $$ = $1; 635 } 636 } 637 ; 638 639 point_or_arrow: /* helper for 'postfix_expression' */ 640 T_POINT { 641 set_symtyp(FMEMBER); 642 $$ = POINT; 643 } 644 | T_ARROW { 645 set_symtyp(FMEMBER); 646 $$ = ARROW; 647 } 648 ; 649 650 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 651 argument_expression_list: 652 assignment_expression { 653 $$ = build_function_argument(NULL, $1); 654 } 655 | argument_expression_list T_COMMA assignment_expression { 656 $$ = build_function_argument($1, $3); 657 } 658 ; 659 660 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 661 unary_expression: 662 postfix_expression 663 | T_INCDEC sys unary_expression { 664 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 665 } 666 | T_AMPER sys cast_expression { 667 $$ = build_unary(ADDR, $2, $3); 668 } 669 | T_ASTERISK sys cast_expression { 670 $$ = build_unary(INDIR, $2, $3); 671 } 672 | T_ADDITIVE sys cast_expression { 673 if (!allow_c90 && $1 == PLUS) { 674 /* unary '+' is illegal in traditional C */ 675 warning(100); 676 } 677 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 678 } 679 | T_COMPLEMENT sys cast_expression { 680 $$ = build_unary(COMPL, $2, $3); 681 } 682 | T_LOGNOT sys cast_expression { 683 $$ = build_unary(NOT, $2, $3); 684 } 685 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 686 $$ = build_unary(REAL, $2, $3); 687 } 688 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 689 $$ = build_unary(IMAG, $2, $3); 690 } 691 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 692 $$ = $2; 693 } 694 | T_SIZEOF unary_expression { 695 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 696 if ($$ != NULL) 697 check_expr_misc($2, 698 false, false, false, false, false, true); 699 } 700 | T_SIZEOF T_LPAREN type_name T_RPAREN { 701 $$ = build_sizeof($3); 702 } 703 | T_ALIGNOF unary_expression { 704 /* non type argument to alignof is a GCC extension */ 705 gnuism(349); 706 lint_assert($2 != NULL); 707 $$ = build_alignof($2->tn_type); 708 } 709 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 710 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 711 /* TODO: c11ism */ 712 $$ = build_alignof($3); 713 } 714 ; 715 716 /* The rule 'unary_operator' is inlined into unary_expression. */ 717 718 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 719 cast_expression: 720 unary_expression 721 | T_LPAREN type_name T_RPAREN sys cast_expression { 722 $$ = cast($5, $4, $2); 723 } 724 ; 725 726 expression_opt: 727 /* empty */ { 728 $$ = NULL; 729 } 730 | expression 731 ; 732 733 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 734 /* 'conditional_expression' also implements 'additive_expression'. */ 735 /* 'conditional_expression' also implements 'shift_expression'. */ 736 /* 'conditional_expression' also implements 'relational_expression'. */ 737 /* 'conditional_expression' also implements 'equality_expression'. */ 738 /* 'conditional_expression' also implements 'AND_expression'. */ 739 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 740 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 741 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 742 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 743 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 744 conditional_expression: 745 cast_expression 746 | conditional_expression T_ASTERISK sys conditional_expression { 747 $$ = build_binary($1, MULT, $3, $4); 748 } 749 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 750 $$ = build_binary($1, $2, $3, $4); 751 } 752 | conditional_expression T_ADDITIVE sys conditional_expression { 753 $$ = build_binary($1, $2, $3, $4); 754 } 755 | conditional_expression T_SHIFT sys conditional_expression { 756 $$ = build_binary($1, $2, $3, $4); 757 } 758 | conditional_expression T_RELATIONAL sys conditional_expression { 759 $$ = build_binary($1, $2, $3, $4); 760 } 761 | conditional_expression T_EQUALITY sys conditional_expression { 762 $$ = build_binary($1, $2, $3, $4); 763 } 764 | conditional_expression T_AMPER sys conditional_expression { 765 $$ = build_binary($1, BITAND, $3, $4); 766 } 767 | conditional_expression T_BITXOR sys conditional_expression { 768 $$ = build_binary($1, BITXOR, $3, $4); 769 } 770 | conditional_expression T_BITOR sys conditional_expression { 771 $$ = build_binary($1, BITOR, $3, $4); 772 } 773 | conditional_expression T_LOGAND sys conditional_expression { 774 $$ = build_binary($1, LOGAND, $3, $4); 775 } 776 | conditional_expression T_LOGOR sys conditional_expression { 777 $$ = build_binary($1, LOGOR, $3, $4); 778 } 779 | conditional_expression T_QUEST sys 780 expression T_COLON sys conditional_expression { 781 $$ = build_binary($1, QUEST, $3, 782 build_binary($4, COLON, $6, $7)); 783 } 784 ; 785 786 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 787 assignment_expression: 788 conditional_expression 789 | unary_expression T_ASSIGN sys assignment_expression { 790 $$ = build_binary($1, ASSIGN, $3, $4); 791 } 792 | unary_expression T_OPASSIGN sys assignment_expression { 793 $$ = build_binary($1, $2, $3, $4); 794 } 795 ; 796 797 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 798 expression: 799 assignment_expression 800 | expression T_COMMA sys assignment_expression { 801 $$ = build_binary($1, COMMA, $3, $4); 802 } 803 ; 804 805 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 806 constant_expression: 807 conditional_expression 808 ; 809 810 declaration_or_error: 811 declaration 812 | error T_SEMI 813 ; 814 815 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 816 declaration: 817 begin_type_declmods end_type T_SEMI { 818 if (dcs->d_scl == TYPEDEF) { 819 /* typedef declares no type name */ 820 warning(72); 821 } else { 822 /* empty declaration */ 823 warning(2); 824 } 825 } 826 | begin_type_declmods end_type notype_init_declarators T_SEMI { 827 if (dcs->d_scl == TYPEDEF) { 828 /* syntax error '%s' */ 829 error(249, "missing base type for typedef"); 830 } else { 831 /* old-style declaration; add 'int' */ 832 error(1); 833 } 834 } 835 | begin_type_declaration_specifiers end_type T_SEMI { 836 if (dcs->d_scl == TYPEDEF) { 837 /* typedef declares no type name */ 838 warning(72); 839 } else if (!dcs->d_nonempty_decl) { 840 /* empty declaration */ 841 warning(2); 842 } 843 } 844 | begin_type_declaration_specifiers end_type 845 type_init_declarators T_SEMI 846 | static_assert_declaration 847 ; 848 849 begin_type_declaration_specifiers: /* see C99 6.7 */ 850 begin_type_typespec { 851 dcs_add_type($1); 852 } 853 | begin_type_declmods type_specifier { 854 dcs_add_type($2); 855 } 856 | type_attribute begin_type_declaration_specifiers 857 | begin_type_declaration_specifiers declmod 858 | begin_type_declaration_specifiers notype_type_specifier { 859 dcs_add_type($2); 860 } 861 ; 862 863 begin_type_declmods: /* see C99 6.7 */ 864 begin_type type_qualifier { 865 dcs_add_qualifiers($2); 866 } 867 | begin_type T_SCLASS { 868 dcs_add_storage_class($2); 869 } 870 | begin_type T_FUNCTION_SPECIFIER { 871 dcs_add_function_specifier($2); 872 } 873 | begin_type_declmods declmod 874 ; 875 876 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 877 begin_type_specifier_qualifier_list_postfix 878 | type_attribute_list begin_type_specifier_qualifier_list_postfix 879 ; 880 881 begin_type_specifier_qualifier_list_postfix: 882 begin_type_typespec { 883 dcs_add_type($1); 884 } 885 | begin_type_qualifier_list type_specifier { 886 dcs_add_type($2); 887 } 888 | begin_type_specifier_qualifier_list_postfix type_qualifier { 889 dcs_add_qualifiers($2); 890 } 891 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 892 dcs_add_type($2); 893 } 894 | begin_type_specifier_qualifier_list_postfix type_attribute 895 ; 896 897 begin_type_typespec: 898 begin_type notype_type_specifier { 899 $$ = $2; 900 } 901 | begin_type T_TYPENAME { 902 $$ = getsym($2)->s_type; 903 } 904 ; 905 906 begin_type_qualifier_list: 907 begin_type type_qualifier { 908 dcs_add_qualifiers($2); 909 } 910 | begin_type_qualifier_list type_qualifier { 911 dcs_add_qualifiers($2); 912 } 913 ; 914 915 declmod: 916 type_qualifier { 917 dcs_add_qualifiers($1); 918 } 919 | T_SCLASS { 920 dcs_add_storage_class($1); 921 } 922 | T_FUNCTION_SPECIFIER { 923 dcs_add_function_specifier($1); 924 } 925 | type_attribute_list 926 ; 927 928 type_attribute_list_opt: 929 /* empty */ 930 | type_attribute_list 931 ; 932 933 type_attribute_list: 934 type_attribute 935 | type_attribute_list type_attribute 936 ; 937 938 type_attribute_opt: 939 /* empty */ 940 | type_attribute 941 ; 942 943 type_attribute: /* See C11 6.7 declaration-specifiers */ 944 gcc_attribute_specifier 945 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 946 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 947 | T_PACKED { 948 dcs_add_packed(); 949 } 950 ; 951 952 begin_type: 953 /* empty */ { 954 dcs_begin_type(); 955 } 956 ; 957 958 end_type: 959 /* empty */ { 960 dcs_end_type(); 961 } 962 ; 963 964 type_specifier: /* C99 6.7.2 */ 965 notype_type_specifier 966 | T_TYPENAME { 967 $$ = getsym($1)->s_type; 968 } 969 ; 970 971 notype_type_specifier: /* see C99 6.7.2 */ 972 T_TYPE { 973 $$ = gettyp($1); 974 } 975 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 976 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 977 $$->t_typeof = true; 978 } 979 | atomic_type_specifier 980 | struct_or_union_specifier { 981 end_declaration_level(); 982 $$ = $1; 983 } 984 | enum_specifier { 985 end_declaration_level(); 986 $$ = $1; 987 } 988 ; 989 990 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 991 atomic_type_specifier: 992 atomic T_LPAREN type_name T_RPAREN { 993 $$ = $3; 994 } 995 ; 996 997 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 998 struct_or_union_specifier: 999 struct_or_union identifier_sym { 1000 /* 1001 * STDC requires that "struct a;" always introduces 1002 * a new tag if "a" is not declared at current level 1003 * 1004 * yychar is valid because otherwise the parser would not 1005 * have been able to decide if it must shift or reduce 1006 */ 1007 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1008 } 1009 | struct_or_union identifier_sym { 1010 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1011 } braced_member_declaration_list { 1012 $$ = complete_struct_or_union($4); 1013 } 1014 | struct_or_union { 1015 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1016 } braced_member_declaration_list { 1017 $$ = complete_struct_or_union($3); 1018 } 1019 | struct_or_union error { 1020 set_symtyp(FVFT); 1021 $$ = gettyp(INT); 1022 } 1023 ; 1024 1025 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1026 struct_or_union: 1027 T_STRUCT_OR_UNION { 1028 set_symtyp(FTAG); 1029 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1030 dcs->d_sou_size_in_bits = 0; 1031 dcs->d_sou_align_in_bits = CHAR_SIZE; 1032 $$ = $1; 1033 } 1034 | struct_or_union type_attribute 1035 ; 1036 1037 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1038 T_LBRACE { 1039 set_symtyp(FVFT); 1040 } member_declaration_list_with_rbrace { 1041 $$ = $3; 1042 } 1043 ; 1044 1045 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1046 member_declaration_list T_RBRACE 1047 | T_RBRACE { 1048 /* XXX: This is not allowed by any C standard. */ 1049 $$ = NULL; 1050 } 1051 ; 1052 1053 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1054 /* Was named struct_declaration_list until C11. */ 1055 member_declaration_list: 1056 member_declaration 1057 | member_declaration_list member_declaration { 1058 $$ = concat_symbols($1, $2); 1059 } 1060 ; 1061 1062 /* Was named struct_declaration until C11. */ 1063 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1064 member_declaration: 1065 begin_type_qualifier_list end_type { 1066 /* ^^ There is no check for the missing type-specifier. */ 1067 /* too late, i know, but getsym() compensates it */ 1068 set_symtyp(FMEMBER); 1069 } notype_member_declarators T_SEMI { 1070 set_symtyp(FVFT); 1071 $$ = $4; 1072 } 1073 | begin_type_specifier_qualifier_list end_type { 1074 set_symtyp(FMEMBER); 1075 } type_member_declarators T_SEMI { 1076 set_symtyp(FVFT); 1077 $$ = $4; 1078 } 1079 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1080 /* syntax error '%s' */ 1081 error(249, "member without type"); 1082 $$ = NULL; 1083 } 1084 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1085 T_SEMI { 1086 set_symtyp(FVFT); 1087 if (!allow_c11 && !allow_gcc) 1088 /* anonymous struct/union members is a C11 feature */ 1089 warning(49); 1090 if (is_struct_or_union(dcs->d_type->t_tspec)) 1091 $$ = declare_unnamed_member(); 1092 else { 1093 /* syntax error '%s' */ 1094 error(249, "unnamed member"); 1095 $$ = NULL; 1096 } 1097 } 1098 | static_assert_declaration { 1099 $$ = NULL; 1100 } 1101 | error T_SEMI { 1102 set_symtyp(FVFT); 1103 $$ = NULL; 1104 } 1105 ; 1106 1107 /* Was named struct_declarators until C11. */ 1108 notype_member_declarators: 1109 notype_member_declarator { 1110 $$ = declare_member($1); 1111 } 1112 | notype_member_declarators { 1113 set_symtyp(FMEMBER); 1114 } T_COMMA type_member_declarator { 1115 $$ = concat_symbols($1, declare_member($4)); 1116 } 1117 ; 1118 1119 /* Was named struct_declarators until C11. */ 1120 type_member_declarators: 1121 type_member_declarator { 1122 $$ = declare_member($1); 1123 } 1124 | type_member_declarators { 1125 set_symtyp(FMEMBER); 1126 } T_COMMA type_member_declarator { 1127 $$ = concat_symbols($1, declare_member($4)); 1128 } 1129 ; 1130 1131 /* Was named struct_declarator until C11. */ 1132 notype_member_declarator: 1133 notype_declarator 1134 /* C99 6.7.2.1 */ 1135 | notype_declarator T_COLON constant_expression { 1136 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1137 } 1138 /* C99 6.7.2.1 */ 1139 | { 1140 set_symtyp(FVFT); 1141 } T_COLON constant_expression { 1142 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1143 } 1144 ; 1145 1146 /* Was named struct_declarator until C11. */ 1147 type_member_declarator: 1148 type_declarator 1149 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1150 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1151 } 1152 | { 1153 set_symtyp(FVFT); 1154 } T_COLON constant_expression type_attribute_list_opt { 1155 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1156 } 1157 ; 1158 1159 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1160 enum_specifier: 1161 enum gcc_attribute_specifier_list_opt identifier_sym { 1162 $$ = make_tag_type($3, ENUM, false, false); 1163 } 1164 | enum gcc_attribute_specifier_list_opt identifier_sym { 1165 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1166 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1167 $$ = complete_enum($5); 1168 } 1169 | enum gcc_attribute_specifier_list_opt { 1170 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1171 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1172 $$ = complete_enum($4); 1173 } 1174 | enum error { 1175 set_symtyp(FVFT); 1176 $$ = gettyp(INT); 1177 } 1178 ; 1179 1180 enum: /* helper for C99 6.7.2.2 */ 1181 T_ENUM { 1182 set_symtyp(FTAG); 1183 begin_declaration_level(DLK_ENUM); 1184 } 1185 ; 1186 1187 enum_declaration: /* helper for C99 6.7.2.2 */ 1188 T_LBRACE { 1189 set_symtyp(FVFT); 1190 enumval = 0; 1191 } enums_with_opt_comma T_RBRACE { 1192 $$ = $3; 1193 } 1194 ; 1195 1196 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1197 enumerator_list 1198 | enumerator_list T_COMMA { 1199 if (!allow_c99 && !allow_trad) { 1200 /* trailing ',' in enum declaration requires C99 ... */ 1201 error(54); 1202 } else { 1203 /* trailing ',' in enum declaration requires C99 ... */ 1204 c99ism(54); 1205 } 1206 $$ = $1; 1207 } 1208 ; 1209 1210 enumerator_list: /* C99 6.7.2.2 */ 1211 enumerator 1212 | enumerator_list T_COMMA enumerator { 1213 $$ = concat_symbols($1, $3); 1214 } 1215 | error { 1216 $$ = NULL; 1217 } 1218 ; 1219 1220 enumerator: /* C99 6.7.2.2 */ 1221 identifier_sym gcc_attribute_specifier_list_opt { 1222 $$ = enumeration_constant($1, enumval, true); 1223 } 1224 | identifier_sym gcc_attribute_specifier_list_opt 1225 T_ASSIGN constant_expression { 1226 $$ = enumeration_constant($1, to_int_constant($4, true), 1227 false); 1228 } 1229 ; 1230 1231 type_qualifier: /* C99 6.7.3 */ 1232 T_QUAL 1233 | atomic { 1234 $$ = (type_qualifiers){ .tq_atomic = true }; 1235 } 1236 ; 1237 1238 atomic: /* helper */ 1239 T_ATOMIC { 1240 /* TODO: First fix c11ism, then use it here. */ 1241 if (!allow_c11) 1242 /* '_Atomic' requires C11 or later */ 1243 error(350); 1244 } 1245 ; 1246 1247 pointer: /* C99 6.7.5 */ 1248 T_ASTERISK type_qualifier_list_opt { 1249 $$ = xcalloc(1, sizeof(*$$)); 1250 add_type_qualifiers(&$$->qualifiers, $2); 1251 } 1252 | T_ASTERISK type_qualifier_list_opt pointer { 1253 $$ = xcalloc(1, sizeof(*$$)); 1254 add_type_qualifiers(&$$->qualifiers, $2); 1255 $$ = append_qualified_pointer($$, $3); 1256 } 1257 ; 1258 1259 type_qualifier_list_opt: /* see C99 6.7.5 */ 1260 /* empty */ { 1261 $$ = (type_qualifiers){ .tq_const = false }; 1262 } 1263 | type_qualifier_list 1264 ; 1265 1266 type_qualifier_list: /* C99 6.7.5 */ 1267 type_qualifier 1268 | type_qualifier_list type_qualifier { 1269 $$ = $1; 1270 add_type_qualifiers(&$$, $2); 1271 } 1272 ; 1273 1274 /* 1275 * For an explanation of 'notype' in the following rules, see 1276 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1277 */ 1278 1279 notype_init_declarators: 1280 notype_init_declarator 1281 | notype_init_declarators T_COMMA type_init_declarator 1282 ; 1283 1284 type_init_declarators: 1285 type_init_declarator 1286 | type_init_declarators T_COMMA type_init_declarator 1287 ; 1288 1289 notype_init_declarator: 1290 notype_declarator asm_or_symbolrename_opt { 1291 cgram_declare($1, false, $2); 1292 check_size($1); 1293 } 1294 | notype_declarator asm_or_symbolrename_opt { 1295 begin_initialization($1); 1296 cgram_declare($1, true, $2); 1297 } T_ASSIGN initializer { 1298 check_size($1); 1299 end_initialization(); 1300 } 1301 ; 1302 1303 type_init_declarator: 1304 type_declarator asm_or_symbolrename_opt { 1305 cgram_declare($1, false, $2); 1306 check_size($1); 1307 } 1308 | type_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 notype_declarator: 1318 notype_direct_declarator 1319 | pointer notype_direct_declarator { 1320 $$ = add_pointer($2, $1); 1321 } 1322 ; 1323 1324 type_declarator: 1325 type_direct_declarator 1326 | pointer type_direct_declarator { 1327 $$ = add_pointer($2, $1); 1328 } 1329 ; 1330 1331 notype_direct_declarator: 1332 type_attribute_list_opt T_NAME { 1333 $$ = declarator_name(getsym($2)); 1334 } 1335 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1336 $$ = $3; 1337 } 1338 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1339 $$ = add_array($1, $3.has_dim, $3.dim); 1340 } 1341 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1342 $$ = add_function(symbolrename($1, $3), $2); 1343 end_declaration_level(); 1344 block_level--; 1345 } 1346 | notype_direct_declarator type_attribute 1347 ; 1348 1349 type_direct_declarator: 1350 type_attribute_list_opt identifier { 1351 $$ = declarator_name(getsym($2)); 1352 } 1353 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1354 $$ = $3; 1355 } 1356 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1357 $$ = add_array($1, $3.has_dim, $3.dim); 1358 } 1359 | type_direct_declarator param_list asm_or_symbolrename_opt { 1360 $$ = add_function(symbolrename($1, $3), $2); 1361 end_declaration_level(); 1362 block_level--; 1363 } 1364 | type_direct_declarator type_attribute 1365 ; 1366 1367 /* 1368 * The two distinct rules type_param_declarator and notype_param_declarator 1369 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1370 * always treated as a typename, not an argument name. For example, after 1371 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1372 * "f(int (double));", not "f(int a);". 1373 */ 1374 type_param_declarator: 1375 direct_param_declarator 1376 | pointer direct_param_declarator { 1377 $$ = add_pointer($2, $1); 1378 } 1379 ; 1380 1381 notype_param_declarator: 1382 direct_notype_param_declarator 1383 | pointer direct_notype_param_declarator { 1384 $$ = add_pointer($2, $1); 1385 } 1386 ; 1387 1388 direct_param_declarator: 1389 identifier type_attribute_list { 1390 $$ = declarator_name(getsym($1)); 1391 } 1392 | identifier { 1393 $$ = declarator_name(getsym($1)); 1394 } 1395 | T_LPAREN notype_param_declarator T_RPAREN { 1396 $$ = $2; 1397 } 1398 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1399 gcc_attribute_specifier_list_opt { 1400 $$ = add_array($1, $3.has_dim, $3.dim); 1401 } 1402 | direct_param_declarator param_list asm_or_symbolrename_opt { 1403 $$ = add_function(symbolrename($1, $3), $2); 1404 end_declaration_level(); 1405 block_level--; 1406 } 1407 ; 1408 1409 direct_notype_param_declarator: 1410 identifier { 1411 $$ = declarator_name(getsym($1)); 1412 } 1413 | T_LPAREN notype_param_declarator T_RPAREN { 1414 $$ = $2; 1415 } 1416 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1417 $$ = add_array($1, $3.has_dim, $3.dim); 1418 } 1419 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1420 $$ = add_function(symbolrename($1, $3), $2); 1421 end_declaration_level(); 1422 block_level--; 1423 } 1424 ; 1425 1426 param_list: 1427 T_LPAREN { 1428 block_level++; 1429 begin_declaration_level(DLK_PROTO_PARAMS); 1430 } identifier_list T_RPAREN { 1431 $$ = (struct parameter_list){ .first = $3 }; 1432 } 1433 | abstract_decl_param_list 1434 ; 1435 1436 array_size_opt: 1437 /* empty */ { 1438 $$.has_dim = false; 1439 $$.dim = 0; 1440 } 1441 | T_ASTERISK { 1442 /* since C99; variable length array of unspecified size */ 1443 $$.has_dim = false; /* TODO: maybe change to true */ 1444 $$.dim = 0; /* just as a placeholder */ 1445 } 1446 | type_qualifier_list_opt T_SCLASS constant_expression { 1447 /* C11 6.7.6.3p7 */ 1448 if ($2 != STATIC) 1449 yyerror("Bad attribute"); 1450 /* static array size requires C11 or later */ 1451 c11ism(343); 1452 $$.has_dim = true; 1453 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1454 } 1455 | type_qualifier { 1456 /* C11 6.7.6.2 */ 1457 if (!$1.tq_restrict) 1458 yyerror("Bad attribute"); 1459 $$.has_dim = true; 1460 $$.dim = 0; 1461 } 1462 | constant_expression { 1463 $$.has_dim = true; 1464 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1465 } 1466 ; 1467 1468 identifier_list: /* C99 6.7.5 */ 1469 T_NAME { 1470 $$ = old_style_function_parameter_name(getsym($1)); 1471 } 1472 | identifier_list T_COMMA T_NAME { 1473 $$ = concat_symbols($1, 1474 old_style_function_parameter_name(getsym($3))); 1475 } 1476 | identifier_list error 1477 ; 1478 1479 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1480 type_name: /* C99 6.7.6 */ 1481 { 1482 begin_declaration_level(DLK_ABSTRACT); 1483 } abstract_declaration { 1484 end_declaration_level(); 1485 $$ = $2->s_type; 1486 } 1487 ; 1488 1489 abstract_declaration: /* specific to lint */ 1490 begin_type_qualifier_list end_type { 1491 $$ = declare_abstract_type(abstract_name()); 1492 } 1493 | begin_type_specifier_qualifier_list end_type { 1494 $$ = declare_abstract_type(abstract_name()); 1495 } 1496 | begin_type_qualifier_list end_type abstract_declarator { 1497 $$ = declare_abstract_type($3); 1498 } 1499 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1500 $$ = declare_abstract_type($3); 1501 } 1502 ; 1503 1504 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1505 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1506 abstract_declarator: 1507 pointer { 1508 $$ = add_pointer(abstract_name(), $1); 1509 } 1510 | direct_abstract_declarator 1511 | pointer direct_abstract_declarator { 1512 $$ = add_pointer($2, $1); 1513 } 1514 | type_attribute_list direct_abstract_declarator { 1515 $$ = $2; 1516 } 1517 | pointer type_attribute_list direct_abstract_declarator { 1518 $$ = add_pointer($3, $1); 1519 } 1520 ; 1521 1522 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1523 direct_abstract_declarator: 1524 /* TODO: sort rules according to C99 */ 1525 T_LPAREN abstract_declarator T_RPAREN { 1526 $$ = $2; 1527 } 1528 | T_LBRACK array_size_opt T_RBRACK { 1529 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1530 } 1531 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1532 $$ = add_array($1, $3.has_dim, $3.dim); 1533 } 1534 | abstract_decl_param_list asm_or_symbolrename_opt { 1535 sym_t *name = abstract_enclosing_name(); 1536 $$ = add_function(symbolrename(name, $2), $1); 1537 end_declaration_level(); 1538 block_level--; 1539 } 1540 | direct_abstract_declarator abstract_decl_param_list 1541 asm_or_symbolrename_opt { 1542 $$ = add_function(symbolrename($1, $3), $2); 1543 end_declaration_level(); 1544 block_level--; 1545 } 1546 | direct_abstract_declarator type_attribute_list 1547 ; 1548 1549 abstract_decl_param_list: /* specific to lint */ 1550 abstract_decl_lparen T_RPAREN type_attribute_opt { 1551 $$ = (struct parameter_list){ .first = NULL }; 1552 } 1553 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1554 type_attribute_opt { 1555 $$ = $2; 1556 $$.prototype = true; 1557 } 1558 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1559 $$ = (struct parameter_list){ .first = NULL }; 1560 } 1561 ; 1562 1563 abstract_decl_lparen: /* specific to lint */ 1564 T_LPAREN { 1565 block_level++; 1566 begin_declaration_level(DLK_PROTO_PARAMS); 1567 } 1568 ; 1569 1570 vararg_parameter_type_list: /* specific to lint */ 1571 parameter_type_list 1572 | parameter_type_list T_COMMA T_ELLIPSIS { 1573 $$ = $1; 1574 $$.vararg = true; 1575 } 1576 | T_ELLIPSIS { 1577 /* TODO: C99 6.7.5 makes this an error as well. */ 1578 if (!allow_trad && !allow_c99) { 1579 /* C90 to C17 require formal parameter before '...' */ 1580 error(84); 1581 } else if (allow_c90) { 1582 /* C90 to C17 require formal parameter before '...' */ 1583 warning(84); 1584 } 1585 $$ = (struct parameter_list){ .vararg = true }; 1586 } 1587 ; 1588 1589 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1590 parameter_type_list: 1591 parameter_declaration { 1592 $$ = (struct parameter_list){ .first = $1 }; 1593 } 1594 | parameter_type_list T_COMMA parameter_declaration { 1595 $$ = $1; 1596 $$.first = concat_symbols($1.first, $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 $$ = declare_parameter(abstract_name(), false); 1605 } 1606 | begin_type_declaration_specifiers end_type { 1607 $$ = declare_parameter(abstract_name(), false); 1608 } 1609 | begin_type_declmods end_type notype_param_declarator { 1610 /* ^^ There is no check for the missing type-specifier. */ 1611 $$ = declare_parameter($3, false); 1612 } 1613 /* 1614 * type_param_declarator is needed because of following conflict: 1615 * "typedef int a; f(int (a));" could be parsed as 1616 * "function with argument a of type int", or 1617 * "function with an unnamed (abstract) argument of type function". 1618 * This grammar realizes the second case. 1619 */ 1620 | begin_type_declaration_specifiers end_type type_param_declarator { 1621 $$ = declare_parameter($3, false); 1622 } 1623 | begin_type_declmods end_type abstract_declarator { 1624 /* ^^ There is no check for the missing type-specifier. */ 1625 $$ = declare_parameter($3, false); 1626 } 1627 | begin_type_declaration_specifiers end_type abstract_declarator { 1628 $$ = declare_parameter($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 /* empty */ { 1666 begin_designation(); 1667 } designator_list T_ASSIGN 1668 | identifier T_COLON { 1669 /* GCC style struct or union member name in initializer */ 1670 gnuism(315); 1671 begin_designation(); 1672 add_designator_member($1); 1673 } 1674 ; 1675 1676 designator_list: /* C99 6.7.8 "Initialization" */ 1677 designator 1678 | designator_list designator 1679 ; 1680 1681 designator: /* C99 6.7.8 "Initialization" */ 1682 T_LBRACK range T_RBRACK { 1683 if (!allow_c99) 1684 /* array initializer with designators is a C99 ... */ 1685 warning(321); 1686 add_designator_subscript($2); 1687 } 1688 | T_POINT identifier { 1689 if (!allow_c99) 1690 /* struct or union member name in initializer is ... */ 1691 warning(313); 1692 add_designator_member($2); 1693 } 1694 ; 1695 1696 static_assert_declaration: 1697 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1698 T_RPAREN T_SEMI { 1699 /* '_Static_assert' requires C11 or later */ 1700 c11ism(354); 1701 } 1702 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1703 /* '_Static_assert' without message requires C23 or later */ 1704 c23ism(355); 1705 } 1706 ; 1707 1708 range: 1709 constant_expression { 1710 $$.lo = to_int_constant($1, true); 1711 $$.hi = $$.lo; 1712 } 1713 | constant_expression T_ELLIPSIS constant_expression { 1714 $$.lo = to_int_constant($1, true); 1715 $$.hi = to_int_constant($3, true); 1716 /* initialization with '[a...b]' is a GCC extension */ 1717 gnuism(340); 1718 } 1719 ; 1720 1721 init_lbrace: /* helper */ 1722 T_LBRACE { 1723 init_lbrace(); 1724 } 1725 ; 1726 1727 init_rbrace: /* helper */ 1728 T_RBRACE { 1729 init_rbrace(); 1730 } 1731 ; 1732 1733 asm_or_symbolrename_opt: /* GCC extensions */ 1734 /* empty */ { 1735 $$ = NULL; 1736 } 1737 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1738 freeyyv(&$3, T_STRING); 1739 $$ = NULL; 1740 } 1741 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1742 gcc_attribute_specifier_list_opt { 1743 $$ = $3; 1744 } 1745 ; 1746 1747 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1748 statement: 1749 expression_statement 1750 | non_expr_statement 1751 ; 1752 1753 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1754 no_attr_statement: 1755 expression_statement 1756 | no_attr_non_expr_statement 1757 ; 1758 1759 non_expr_statement: /* helper for C99 6.8 */ 1760 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1761 | no_attr_non_expr_statement 1762 ; 1763 1764 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1765 no_attr_non_expr_statement: 1766 labeled_statement 1767 | compound_statement 1768 | selection_statement 1769 | iteration_statement 1770 | jump_statement { 1771 suppress_fallthrough = false; 1772 } 1773 | asm_statement 1774 ; 1775 1776 labeled_statement: /* C99 6.8.1 */ 1777 label gcc_attribute_specifier_list_opt no_attr_statement 1778 ; 1779 1780 label: 1781 T_NAME T_COLON { 1782 set_symtyp(FLABEL); 1783 named_label(getsym($1)); 1784 } 1785 | T_CASE constant_expression T_COLON { 1786 case_label($2); 1787 suppress_fallthrough = true; 1788 } 1789 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1790 /* XXX: We don't fill all cases */ 1791 case_label($2); 1792 suppress_fallthrough = true; 1793 } 1794 | T_DEFAULT T_COLON { 1795 default_label(); 1796 suppress_fallthrough = true; 1797 } 1798 ; 1799 1800 compound_statement: /* C99 6.8.2 */ 1801 compound_statement_lbrace compound_statement_rbrace 1802 | compound_statement_lbrace block_item_list compound_statement_rbrace 1803 ; 1804 1805 compound_statement_lbrace: 1806 T_LBRACE { 1807 block_level++; 1808 mem_block_level++; 1809 debug_step("%s: mem_block_level = %zu", 1810 "compound_statement_lbrace", mem_block_level); 1811 begin_declaration_level(DLK_AUTO); 1812 } 1813 ; 1814 1815 compound_statement_rbrace: 1816 T_RBRACE { 1817 end_declaration_level(); 1818 if (!in_statement_expr()) 1819 level_free_all(mem_block_level); /* leak */ 1820 mem_block_level--; 1821 debug_step("%s: mem_block_level = %zu", 1822 "compound_statement_rbrace", mem_block_level); 1823 block_level--; 1824 suppress_fallthrough = false; 1825 } 1826 ; 1827 1828 block_item_list: /* C99 6.8.2 */ 1829 block_item 1830 | block_item_list block_item { 1831 if ($1 && !$2) 1832 /* declarations after statements is a C99 feature */ 1833 c99ism(327); 1834 $$ = $1 || $2; 1835 } 1836 ; 1837 1838 block_item: /* C99 6.8.2 */ 1839 declaration_or_error { 1840 $$ = false; 1841 restore_warning_flags(); 1842 } 1843 | statement { 1844 $$ = true; 1845 restore_warning_flags(); 1846 } 1847 ; 1848 1849 expression_statement: /* C99 6.8.3 */ 1850 expression T_SEMI { 1851 expr($1, false, false, false, false); 1852 suppress_fallthrough = false; 1853 } 1854 | T_SEMI { 1855 check_statement_reachable(); 1856 suppress_fallthrough = false; 1857 } 1858 ; 1859 1860 selection_statement: /* C99 6.8.4 */ 1861 if_without_else %prec T_THEN { 1862 save_warning_flags(); 1863 stmt_if_then_stmt(); 1864 stmt_if_else_stmt(false); 1865 } 1866 | if_without_else T_ELSE { 1867 save_warning_flags(); 1868 stmt_if_then_stmt(); 1869 } statement { 1870 clear_warning_flags(); 1871 stmt_if_else_stmt(true); 1872 } 1873 | if_without_else T_ELSE error { 1874 clear_warning_flags(); 1875 stmt_if_else_stmt(false); 1876 } 1877 | switch_expr statement { 1878 clear_warning_flags(); 1879 stmt_switch_expr_stmt(); 1880 } 1881 | switch_expr error { 1882 clear_warning_flags(); 1883 stmt_switch_expr_stmt(); 1884 } 1885 ; 1886 1887 if_without_else: /* see C99 6.8.4 */ 1888 if_expr statement 1889 | if_expr error 1890 ; 1891 1892 if_expr: /* see C99 6.8.4 */ 1893 T_IF T_LPAREN expression T_RPAREN { 1894 stmt_if_expr($3); 1895 clear_warning_flags(); 1896 } 1897 ; 1898 1899 switch_expr: /* see C99 6.8.4 */ 1900 T_SWITCH T_LPAREN expression T_RPAREN { 1901 stmt_switch_expr($3); 1902 clear_warning_flags(); 1903 } 1904 ; 1905 1906 iteration_statement: /* C99 6.8.5 */ 1907 while_expr statement { 1908 clear_warning_flags(); 1909 stmt_while_expr_stmt(); 1910 } 1911 | while_expr error { 1912 clear_warning_flags(); 1913 stmt_while_expr_stmt(); 1914 } 1915 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1916 stmt_do_while_expr($4); 1917 suppress_fallthrough = false; 1918 } 1919 | do error { 1920 clear_warning_flags(); 1921 stmt_do_while_expr(NULL); 1922 } 1923 | for_exprs statement { 1924 clear_warning_flags(); 1925 stmt_for_exprs_stmt(); 1926 end_declaration_level(); 1927 block_level--; 1928 } 1929 | for_exprs error { 1930 clear_warning_flags(); 1931 stmt_for_exprs_stmt(); 1932 end_declaration_level(); 1933 block_level--; 1934 } 1935 ; 1936 1937 while_expr: /* see C99 6.8.5 */ 1938 T_WHILE T_LPAREN expression T_RPAREN { 1939 stmt_while_expr($3); 1940 clear_warning_flags(); 1941 } 1942 ; 1943 1944 do_statement: /* see C99 6.8.5 */ 1945 do statement { 1946 clear_warning_flags(); 1947 } 1948 ; 1949 1950 do: /* see C99 6.8.5 */ 1951 T_DO { 1952 stmt_do(); 1953 } 1954 ; 1955 1956 for_start: /* see C99 6.8.5 */ 1957 T_FOR T_LPAREN { 1958 begin_declaration_level(DLK_AUTO); 1959 block_level++; 1960 } 1961 ; 1962 1963 for_exprs: /* see C99 6.8.5 */ 1964 for_start 1965 begin_type_declaration_specifiers end_type 1966 notype_init_declarators T_SEMI 1967 expression_opt T_SEMI 1968 expression_opt T_RPAREN { 1969 /* variable declaration in for loop */ 1970 c99ism(325); 1971 stmt_for_exprs(NULL, $6, $8); 1972 clear_warning_flags(); 1973 } 1974 | for_start 1975 expression_opt T_SEMI 1976 expression_opt T_SEMI 1977 expression_opt T_RPAREN { 1978 stmt_for_exprs($2, $4, $6); 1979 clear_warning_flags(); 1980 } 1981 ; 1982 1983 jump_statement: /* C99 6.8.6 */ 1984 goto identifier T_SEMI { 1985 stmt_goto(getsym($2)); 1986 } 1987 | goto error T_SEMI { 1988 set_symtyp(FVFT); 1989 } 1990 | T_CONTINUE T_SEMI { 1991 stmt_continue(); 1992 } 1993 | T_BREAK T_SEMI { 1994 stmt_break(); 1995 } 1996 | T_RETURN sys T_SEMI { 1997 stmt_return($2, NULL); 1998 } 1999 | T_RETURN sys expression T_SEMI { 2000 stmt_return($2, $3); 2001 } 2002 ; 2003 2004 goto: /* see C99 6.8.6 */ 2005 T_GOTO { 2006 set_symtyp(FLABEL); 2007 } 2008 ; 2009 2010 asm_statement: /* GCC extension */ 2011 T_ASM T_LPAREN read_until_rparen T_SEMI { 2012 dcs_set_asm(); 2013 } 2014 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2015 dcs_set_asm(); 2016 } 2017 | T_ASM error 2018 ; 2019 2020 read_until_rparen: /* helper for 'asm_statement' */ 2021 /* empty */ { 2022 read_until_rparen(); 2023 } 2024 ; 2025 2026 translation_unit: /* C99 6.9 */ 2027 external_declaration 2028 | translation_unit external_declaration 2029 ; 2030 2031 external_declaration: /* C99 6.9 */ 2032 function_definition { 2033 global_clean_up_decl(false); 2034 clear_warning_flags(); 2035 } 2036 | top_level_declaration { 2037 global_clean_up_decl(false); 2038 clear_warning_flags(); 2039 } 2040 | asm_statement /* GCC extension */ 2041 | T_SEMI { /* GCC extension */ 2042 /* 2043 * TODO: Only allow this in GCC mode, not in plain C99. 2044 * This is one of the top 10 warnings in the NetBSD build. 2045 */ 2046 if (!allow_trad && !allow_c99) { 2047 /* empty declaration */ 2048 error(0); 2049 } else if (allow_c90) { 2050 /* empty declaration */ 2051 warning(0); 2052 } 2053 } 2054 ; 2055 2056 /* 2057 * On the top level, lint allows several forms of declarations that it doesn't 2058 * allow in functions. For example, a single ';' is an empty declaration and 2059 * is supported by some compilers, but in a function it would be an empty 2060 * statement, not a declaration. This makes a difference in C90 mode, where 2061 * a statement must not be followed by a declaration. 2062 * 2063 * See 'declaration' for all other declarations. 2064 */ 2065 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2066 begin_type end_type notype_init_declarators T_SEMI { 2067 /* TODO: Make this an error in C99 mode as well. */ 2068 if (!allow_trad && !allow_c99) { 2069 /* old-style declaration; add 'int' */ 2070 error(1); 2071 } else if (allow_c90) { 2072 /* old-style declaration; add 'int' */ 2073 warning(1); 2074 } 2075 } 2076 | declaration 2077 | error T_SEMI { 2078 global_clean_up(); 2079 } 2080 | error T_RBRACE { 2081 global_clean_up(); 2082 } 2083 ; 2084 2085 function_definition: /* C99 6.9.1 */ 2086 func_declarator { 2087 if ($1->s_type->t_tspec != FUNC) { 2088 /* syntax error '%s' */ 2089 error(249, yytext); 2090 YYERROR; 2091 } 2092 if ($1->s_type->t_typedef) { 2093 /* ()-less function definition */ 2094 error(64); 2095 YYERROR; 2096 } 2097 check_extern_declaration($1); 2098 begin_function($1); 2099 block_level++; 2100 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2101 if (lwarn == LWARN_NONE) 2102 $1->s_used = true; 2103 } arg_declaration_list_opt { 2104 end_declaration_level(); 2105 block_level--; 2106 check_func_lint_directives(); 2107 check_func_old_style_parameters(); 2108 begin_control_statement(CS_FUNCTION_BODY); 2109 } compound_statement { 2110 end_function(); 2111 end_control_statement(CS_FUNCTION_BODY); 2112 } 2113 ; 2114 2115 func_declarator: 2116 begin_type end_type notype_declarator { 2117 if (!allow_trad) { 2118 /* old-style declaration; add 'int' */ 2119 error(1); 2120 } 2121 $$ = $3; 2122 } 2123 | begin_type_declmods end_type notype_declarator { 2124 if (!allow_trad) { 2125 /* old-style declaration; add 'int' */ 2126 error(1); 2127 } 2128 $$ = $3; 2129 } 2130 | begin_type_declaration_specifiers end_type type_declarator { 2131 $$ = $3; 2132 } 2133 ; 2134 2135 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2136 /* empty */ 2137 | arg_declaration_list 2138 ; 2139 2140 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2141 arg_declaration 2142 | arg_declaration_list arg_declaration 2143 /* XXX or better "arg_declaration error" ? */ 2144 | error 2145 ; 2146 2147 /* 2148 * "arg_declaration" is separated from "declaration" because it 2149 * needs other error handling. 2150 */ 2151 arg_declaration: 2152 begin_type_declmods end_type T_SEMI { 2153 /* empty declaration */ 2154 warning(2); 2155 } 2156 | begin_type_declmods end_type notype_init_declarators T_SEMI 2157 | begin_type_declaration_specifiers end_type T_SEMI { 2158 if (!dcs->d_nonempty_decl) { 2159 /* empty declaration */ 2160 warning(2); 2161 } else { 2162 /* '%s' declared in parameter declaration list */ 2163 warning(3, type_name(dcs->d_type)); 2164 } 2165 } 2166 | begin_type_declaration_specifiers end_type 2167 type_init_declarators T_SEMI { 2168 if (dcs->d_nonempty_decl) { 2169 /* '%s' declared in parameter declaration list */ 2170 warning(3, type_name(dcs->d_type)); 2171 } 2172 } 2173 | begin_type_declmods error 2174 | begin_type_declaration_specifiers error 2175 ; 2176 2177 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2178 gcc_attribute_specifier_list_opt: 2179 /* empty */ 2180 | gcc_attribute_specifier_list 2181 ; 2182 2183 gcc_attribute_specifier_list: 2184 gcc_attribute_specifier 2185 | gcc_attribute_specifier_list gcc_attribute_specifier 2186 ; 2187 2188 gcc_attribute_specifier: 2189 T_ATTRIBUTE T_LPAREN T_LPAREN { 2190 in_gcc_attribute = true; 2191 } gcc_attribute_list { 2192 in_gcc_attribute = false; 2193 } T_RPAREN T_RPAREN 2194 ; 2195 2196 gcc_attribute_list: 2197 gcc_attribute 2198 | gcc_attribute_list T_COMMA gcc_attribute 2199 ; 2200 2201 gcc_attribute: 2202 /* empty */ 2203 | T_NAME { 2204 const char *name = $1->sb_name; 2205 if (is_either(name, "packed", "__packed__")) 2206 dcs_add_packed(); 2207 else if (is_either(name, "used", "__used__") || 2208 is_either(name, "unused", "__unused__")) 2209 dcs_set_used(); 2210 else if (is_either(name, "fallthrough", "__fallthrough__")) 2211 suppress_fallthrough = true; 2212 } 2213 | T_NAME T_LPAREN T_RPAREN 2214 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2215 | type_qualifier { 2216 if (!$1.tq_const) 2217 yyerror("Bad attribute"); 2218 } 2219 ; 2220 2221 gcc_attribute_parameters: 2222 constant_expression 2223 | gcc_attribute_parameters T_COMMA constant_expression 2224 ; 2225 2226 sys: 2227 /* empty */ { 2228 $$ = in_system_header; 2229 } 2230 ; 2231 2232 %% 2233 2234 /* ARGSUSED */ 2235 int 2236 yyerror(const char *msg) 2237 { 2238 /* syntax error '%s' */ 2239 error(249, yytext); 2240 if (++sytxerr >= 5) 2241 norecover(); 2242 return 0; 2243 } 2244 2245 #if YYDEBUG && YYBYACC 2246 static const char * 2247 cgram_to_string(int token, YYSTYPE val) 2248 { 2249 2250 switch (token) { 2251 case T_INCDEC: 2252 return val.y_inc ? "++" : "--"; 2253 case T_MULTIPLICATIVE: 2254 case T_ADDITIVE: 2255 case T_SHIFT: 2256 case T_RELATIONAL: 2257 case T_EQUALITY: 2258 case T_OPASSIGN: 2259 return op_name(val.y_op); 2260 case T_SCLASS: 2261 return scl_name(val.y_scl); 2262 case T_TYPE: 2263 case T_STRUCT_OR_UNION: 2264 return tspec_name(val.y_tspec); 2265 case T_QUAL: 2266 return type_qualifiers_string(val.y_type_qualifiers); 2267 case T_FUNCTION_SPECIFIER: 2268 return function_specifier_name(val.y_function_specifier); 2269 case T_NAME: 2270 return val.y_name->sb_name; 2271 default: 2272 return "<none>"; 2273 } 2274 } 2275 #endif 2276 2277 static void 2278 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2279 { 2280 declare(decl, has_initializer, renaming); 2281 if (renaming != NULL) 2282 freeyyv(&renaming, T_NAME); 2283 } 2284 2285 /* 2286 * Discard all input tokens up to and including the next unmatched right 2287 * parenthesis. 2288 */ 2289 static void 2290 read_until_rparen(void) 2291 { 2292 int level; 2293 2294 if (yychar < 0) 2295 yychar = yylex(); 2296 freeyyv(&yylval, yychar); 2297 2298 level = 1; 2299 while (yychar > 0) { 2300 if (yychar == T_LPAREN) 2301 level++; 2302 if (yychar == T_RPAREN && --level == 0) 2303 break; 2304 freeyyv(&yylval, yychar = yylex()); 2305 } 2306 2307 yyclearin; 2308 } 2309 2310 static sym_t * 2311 symbolrename(sym_t *s, sbuf_t *sb) 2312 { 2313 if (sb != NULL) 2314 s->s_rename = sb->sb_name; 2315 return s; 2316 } 2317
Indexes created Fri Oct 03 02:09:57 GMT 2025