cgram.y revision 1.487
1 %{ 2 /* $NetBSD: cgram.y,v 1.487 2024/02/05 23:11:22 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 1.487 2024/02/05 23:11:22 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 function_call *y_arguments; 149 type_t *y_type; 150 tnode_t *y_tnode; 151 range_t y_range; 152 buffer *y_string; 153 qual_ptr *y_qual_ptr; 154 bool y_seen_statement; 155 struct generic_association *y_generic; 156 struct array_size y_array_size; 157 bool y_in_system_header; 158 designation y_designation; 159 }; 160 161 /* for Bison: 162 %printer { 163 if (is_integer($$->v_tspec)) 164 fprintf(yyo, "%lld", (long long)$$->u.integer); 165 else 166 fprintf(yyo, "%Lg", $$->u.floating); 167 } <y_val> 168 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 169 %printer { 170 bool indented = debug_push_indented(true); 171 debug_sym("", $$, ""); 172 debug_pop_indented(indented); 173 } <y_sym> 174 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 175 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 176 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 177 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 178 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 179 %printer { 180 fprintf(yyo, "%s", function_specifier_name($$)); 181 } <y_function_specifier> 182 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 183 %printer { 184 if ($$ == NULL) 185 fprintf(yyo, "<null>"); 186 else 187 fprintf(yyo, "%s '%s'", 188 op_name($$->tn_op), type_name($$->tn_type)); 189 } <y_tnode> 190 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 191 %printer { fprintf(yyo, "length %zu", $$->len); } <y_string> 192 %printer { 193 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 194 } <y_qual_ptr> 195 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 196 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 197 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 198 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 199 */ 200 201 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 202 %token T_POINT T_ARROW 203 %token T_COMPLEMENT T_LOGNOT 204 %token <y_inc> T_INCDEC 205 %token T_SIZEOF 206 %token T_BUILTIN_OFFSETOF 207 %token T_TYPEOF 208 %token T_EXTENSION 209 %token T_ALIGNAS 210 %token T_ALIGNOF 211 %token T_ASTERISK 212 %token <y_op> T_MULTIPLICATIVE 213 %token <y_op> T_ADDITIVE 214 %token <y_op> T_SHIFT 215 %token <y_op> T_RELATIONAL 216 %token <y_op> T_EQUALITY 217 %token T_AMPER 218 %token T_BITXOR 219 %token T_BITOR 220 %token T_LOGAND 221 %token T_LOGOR 222 %token T_QUEST 223 %token T_COLON 224 %token T_ASSIGN 225 %token <y_op> T_OPASSIGN 226 %token T_COMMA 227 %token T_SEMI 228 %token T_ELLIPSIS 229 %token T_REAL 230 %token T_IMAG 231 %token T_GENERIC 232 233 /* storage classes (extern, static, auto, register and typedef) */ 234 %token <y_scl> T_SCLASS 235 %token <y_function_specifier> T_FUNCTION_SPECIFIER 236 237 /* 238 * predefined type keywords (char, int, short, long, unsigned, signed, 239 * float, double, void); see T_TYPENAME for types from typedef 240 */ 241 %token <y_tspec> T_TYPE 242 243 %token <y_type_qualifiers> T_QUAL 244 %token <y_type_qualifiers> T_ATOMIC 245 246 /* struct or union */ 247 %token <y_tspec> T_STRUCT_OR_UNION 248 249 /* remaining keywords */ 250 %token T_ASM 251 %token T_BREAK 252 %token T_CASE 253 %token T_CONTINUE 254 %token T_DEFAULT 255 %token T_DO 256 %token T_ELSE 257 %token T_ENUM 258 %token T_FOR 259 %token T_GOTO 260 %token T_IF 261 %token T_PACKED 262 %token T_RETURN 263 %token T_SWITCH 264 %token T_SYMBOLRENAME 265 %token T_WHILE 266 %token T_STATIC_ASSERT 267 268 %token T_ATTRIBUTE 269 270 %left T_THEN 271 %left T_ELSE 272 %right T_QUEST T_COLON 273 %left T_LOGOR 274 %left T_LOGAND 275 %left T_BITOR 276 %left T_BITXOR 277 %left T_AMPER 278 %left T_EQUALITY 279 %left T_RELATIONAL 280 %left T_SHIFT 281 %left T_ADDITIVE 282 %left T_ASTERISK T_MULTIPLICATIVE 283 284 %token <y_name> T_NAME 285 %token <y_name> T_TYPENAME 286 %token <y_val> T_CON 287 %token <y_string> T_STRING 288 289 /* No type for program. */ 290 %type <y_sym> identifier_sym 291 %type <y_name> identifier 292 %type <y_string> string 293 %type <y_tnode> primary_expression 294 %type <y_designation> member_designator 295 %type <y_tnode> generic_selection 296 %type <y_generic> generic_assoc_list 297 %type <y_generic> generic_association 298 %type <y_tnode> postfix_expression 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_arguments> 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 designation. */ 377 /* No type for designator_list. */ 378 /* No type for designator. */ 379 /* No type for static_assert_declaration. */ 380 %type <y_range> range 381 /* No type for init_lbrace. */ 382 /* No type for init_rbrace. */ 383 %type <y_name> asm_or_symbolrename_opt 384 /* No type for statement. */ 385 /* No type for no_attr_statement. */ 386 /* No type for non_expr_statement. */ 387 /* No type for no_attr_non_expr_statement. */ 388 /* No type for labeled_statement. */ 389 /* No type for label. */ 390 /* No type for compound_statement. */ 391 /* No type for compound_statement_lbrace. */ 392 /* No type for compound_statement_rbrace. */ 393 %type <y_seen_statement> block_item_list 394 %type <y_seen_statement> block_item 395 /* No type for expression_statement. */ 396 /* No type for selection_statement. */ 397 /* No type for if_without_else. */ 398 /* No type for if_expr. */ 399 /* No type for switch_expr. */ 400 /* No type for iteration_statement. */ 401 /* No type for while_expr. */ 402 /* No type for do_statement. */ 403 /* No type for do. */ 404 /* No type for for_start. */ 405 /* No type for for_exprs. */ 406 /* No type for jump_statement. */ 407 /* No type for goto. */ 408 /* No type for asm_statement. */ 409 /* No type for read_until_rparen. */ 410 /* No type for translation_unit. */ 411 /* No type for external_declaration. */ 412 /* No type for top_level_declaration. */ 413 /* No type for function_definition. */ 414 %type <y_sym> func_declarator 415 /* No type for arg_declaration_list_opt. */ 416 /* No type for arg_declaration_list. */ 417 /* No type for arg_declaration. */ 418 /* No type for gcc_attribute_specifier_list_opt. */ 419 /* No type for gcc_attribute_specifier_list. */ 420 /* No type for gcc_attribute_specifier. */ 421 /* No type for gcc_attribute_list. */ 422 /* No type for gcc_attribute. */ 423 /* No type for gcc_attribute_parameters. */ 424 %type <y_in_system_header> sys 425 426 %% 427 428 program: 429 /* empty */ { 430 /* TODO: Make this an error in C99 mode as well. */ 431 if (!allow_trad && !allow_c99) { 432 /* empty translation unit */ 433 error(272); 434 } else if (allow_c90) { 435 /* empty translation unit */ 436 warning(272); 437 } 438 } 439 | translation_unit 440 ; 441 442 identifier_sym: /* helper for struct/union/enum */ 443 identifier { 444 $$ = getsym($1); 445 } 446 ; 447 448 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 449 identifier: 450 T_NAME { 451 debug_step("cgram: name '%s'", $1->sb_name); 452 $$ = $1; 453 } 454 | T_TYPENAME { 455 debug_step("cgram: typename '%s'", $1->sb_name); 456 $$ = $1; 457 } 458 ; 459 460 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 461 string: 462 T_STRING 463 | string T_STRING { 464 if (!allow_c90) { 465 /* concatenated strings are illegal in traditional C */ 466 warning(219); 467 } 468 $$ = cat_strings($1, $2); 469 } 470 ; 471 472 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 473 primary_expression: 474 T_NAME { 475 bool sys_name, sys_next; 476 sys_name = in_system_header; 477 if (yychar < 0) 478 yychar = yylex(); 479 sys_next = in_system_header; 480 in_system_header = sys_name; 481 $$ = build_name(getsym($1), yychar == T_LPAREN); 482 in_system_header = sys_next; 483 } 484 | T_CON { 485 $$ = build_constant(gettyp($1->v_tspec), $1); 486 } 487 | string { 488 $$ = build_string($1); 489 } 490 | T_LPAREN expression T_RPAREN { 491 if ($2 != NULL) 492 $2->tn_parenthesized = true; 493 $$ = $2; 494 } 495 | generic_selection 496 /* GCC primary-expression, see c_parser_postfix_expression */ 497 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 498 set_sym_kind(SK_MEMBER); 499 } member_designator T_RPAREN { 500 $$ = build_offsetof($3, $6); 501 } 502 ; 503 504 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 505 member_designator: 506 identifier { 507 $$ = (designation) { .dn_len = 0 }; 508 designation_push(&$$, DK_MEMBER, getsym($1), 0); 509 } 510 | member_designator T_LBRACK range T_RBRACK { 511 $$ = $1; 512 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 513 } 514 | member_designator T_POINT { 515 set_sym_kind(SK_MEMBER); 516 } identifier { 517 $$ = $1; 518 designation_push(&$$, DK_MEMBER, getsym($4), 0); 519 } 520 ; 521 522 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 523 generic_selection: 524 T_GENERIC T_LPAREN assignment_expression T_COMMA 525 generic_assoc_list T_RPAREN { 526 /* generic selection requires C11 or later */ 527 c11ism(345); 528 $$ = build_generic_selection($3, $5); 529 } 530 ; 531 532 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 533 generic_assoc_list: 534 generic_association 535 | generic_assoc_list T_COMMA generic_association { 536 $3->ga_prev = $1; 537 $$ = $3; 538 } 539 ; 540 541 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 542 generic_association: 543 type_name T_COLON assignment_expression { 544 $$ = block_zero_alloc(sizeof(*$$), "generic"); 545 $$->ga_arg = $1; 546 $$->ga_result = $3; 547 } 548 | T_DEFAULT T_COLON assignment_expression { 549 $$ = block_zero_alloc(sizeof(*$$), "generic"); 550 $$->ga_arg = NULL; 551 $$->ga_result = $3; 552 } 553 ; 554 555 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 556 postfix_expression: 557 primary_expression 558 | postfix_expression T_LBRACK sys expression T_RBRACK { 559 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 560 } 561 | postfix_expression T_LPAREN sys T_RPAREN { 562 function_call *call = 563 expr_zero_alloc(sizeof(*call), "function_call"); 564 $$ = build_function_call($1, $3, call); 565 } 566 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 567 $$ = build_function_call($1, $3, $4); 568 } 569 | postfix_expression point_or_arrow sys T_NAME { 570 $$ = build_member_access($1, $2, $3, $4); 571 } 572 | postfix_expression T_INCDEC sys { 573 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 574 } 575 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 576 sym_t *tmp = mktempsym($2); 577 begin_initialization(tmp); 578 cgram_declare(tmp, true, NULL); 579 } braced_initializer { 580 if (!allow_c99) 581 /* compound literals are a C99/GCC extension */ 582 gnuism(319); 583 $$ = build_name(current_initsym(), false); 584 end_initialization(); 585 } 586 | T_LPAREN compound_statement_lbrace { 587 begin_statement_expr(); 588 } gcc_statement_expr_list { 589 do_statement_expr($4); 590 } compound_statement_rbrace T_RPAREN { 591 $$ = end_statement_expr(); 592 } 593 ; 594 595 /* 596 * The inner part of a GCC statement-expression of the form ({ ... }). 597 * 598 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 599 */ 600 gcc_statement_expr_list: 601 gcc_statement_expr_item 602 | gcc_statement_expr_list gcc_statement_expr_item { 603 $$ = $2; 604 } 605 ; 606 607 gcc_statement_expr_item: 608 declaration_or_error { 609 clear_warning_flags(); 610 $$ = NULL; 611 } 612 | non_expr_statement { 613 $$ = expr_alloc_tnode(); 614 $$->tn_type = gettyp(VOID); 615 } 616 | T_SEMI { 617 $$ = expr_alloc_tnode(); 618 $$->tn_type = gettyp(VOID); 619 } 620 | expression T_SEMI { 621 if ($1 == NULL) { /* in case of syntax errors */ 622 $$ = expr_alloc_tnode(); 623 $$->tn_type = gettyp(VOID); 624 } else { 625 /* XXX: do that only on the last name */ 626 if ($1->tn_op == NAME) 627 $1->tn_sym->s_used = true; 628 expr($1, false, false, false, false); 629 suppress_fallthrough = false; 630 $$ = $1; 631 } 632 } 633 ; 634 635 point_or_arrow: /* helper for 'postfix_expression' */ 636 T_POINT { 637 set_sym_kind(SK_MEMBER); 638 $$ = POINT; 639 } 640 | T_ARROW { 641 set_sym_kind(SK_MEMBER); 642 $$ = ARROW; 643 } 644 ; 645 646 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 647 argument_expression_list: 648 assignment_expression { 649 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 650 add_function_argument($$, $1); 651 } 652 | argument_expression_list T_COMMA assignment_expression { 653 add_function_argument($1, $3); 654 } 655 ; 656 657 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 658 unary_expression: 659 postfix_expression 660 | T_INCDEC sys unary_expression { 661 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 662 } 663 | T_AMPER sys cast_expression { 664 $$ = build_unary(ADDR, $2, $3); 665 } 666 | T_ASTERISK sys cast_expression { 667 $$ = build_unary(INDIR, $2, $3); 668 } 669 | T_ADDITIVE sys cast_expression { 670 if (!allow_c90 && $1 == PLUS) { 671 /* unary '+' is illegal in traditional C */ 672 warning(100); 673 } 674 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 675 } 676 | T_COMPLEMENT sys cast_expression { 677 $$ = build_unary(COMPL, $2, $3); 678 } 679 | T_LOGNOT sys cast_expression { 680 $$ = build_unary(NOT, $2, $3); 681 } 682 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 683 $$ = build_unary(REAL, $2, $3); 684 } 685 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 686 $$ = build_unary(IMAG, $2, $3); 687 } 688 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 689 $$ = $2; 690 } 691 | T_SIZEOF unary_expression { 692 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 693 if ($$ != NULL) 694 check_expr_misc($2, 695 false, false, false, false, false, true); 696 } 697 | T_SIZEOF T_LPAREN type_name T_RPAREN { 698 $$ = build_sizeof($3); 699 } 700 | T_ALIGNOF unary_expression { 701 /* non type argument to alignof is a GCC extension */ 702 gnuism(349); 703 lint_assert($2 != NULL); 704 $$ = build_alignof($2->tn_type); 705 } 706 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 707 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 708 /* TODO: c11ism */ 709 $$ = build_alignof($3); 710 } 711 ; 712 713 /* The rule 'unary_operator' is inlined into unary_expression. */ 714 715 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 716 cast_expression: 717 unary_expression 718 | T_LPAREN type_name T_RPAREN sys cast_expression { 719 $$ = cast($5, $4, $2); 720 } 721 ; 722 723 expression_opt: 724 /* empty */ { 725 $$ = NULL; 726 } 727 | expression 728 ; 729 730 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 731 /* 'conditional_expression' also implements 'additive_expression'. */ 732 /* 'conditional_expression' also implements 'shift_expression'. */ 733 /* 'conditional_expression' also implements 'relational_expression'. */ 734 /* 'conditional_expression' also implements 'equality_expression'. */ 735 /* 'conditional_expression' also implements 'AND_expression'. */ 736 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 737 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 738 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 739 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 740 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 741 conditional_expression: 742 cast_expression 743 | conditional_expression T_ASTERISK sys conditional_expression { 744 $$ = build_binary($1, MULT, $3, $4); 745 } 746 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 747 $$ = build_binary($1, $2, $3, $4); 748 } 749 | conditional_expression T_ADDITIVE sys conditional_expression { 750 $$ = build_binary($1, $2, $3, $4); 751 } 752 | conditional_expression T_SHIFT sys conditional_expression { 753 $$ = build_binary($1, $2, $3, $4); 754 } 755 | conditional_expression T_RELATIONAL sys conditional_expression { 756 $$ = build_binary($1, $2, $3, $4); 757 } 758 | conditional_expression T_EQUALITY sys conditional_expression { 759 $$ = build_binary($1, $2, $3, $4); 760 } 761 | conditional_expression T_AMPER sys conditional_expression { 762 $$ = build_binary($1, BITAND, $3, $4); 763 } 764 | conditional_expression T_BITXOR sys conditional_expression { 765 $$ = build_binary($1, BITXOR, $3, $4); 766 } 767 | conditional_expression T_BITOR sys conditional_expression { 768 $$ = build_binary($1, BITOR, $3, $4); 769 } 770 | conditional_expression T_LOGAND sys conditional_expression { 771 $$ = build_binary($1, LOGAND, $3, $4); 772 } 773 | conditional_expression T_LOGOR sys conditional_expression { 774 $$ = build_binary($1, LOGOR, $3, $4); 775 } 776 | conditional_expression T_QUEST sys 777 expression T_COLON sys conditional_expression { 778 $$ = build_binary($1, QUEST, $3, 779 build_binary($4, COLON, $6, $7)); 780 } 781 ; 782 783 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 784 assignment_expression: 785 conditional_expression 786 | unary_expression T_ASSIGN sys assignment_expression { 787 $$ = build_binary($1, ASSIGN, $3, $4); 788 } 789 | unary_expression T_OPASSIGN sys assignment_expression { 790 $$ = build_binary($1, $2, $3, $4); 791 } 792 ; 793 794 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 795 expression: 796 assignment_expression 797 | expression T_COMMA sys assignment_expression { 798 $$ = build_binary($1, COMMA, $3, $4); 799 } 800 ; 801 802 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 803 constant_expression: 804 conditional_expression 805 ; 806 807 declaration_or_error: 808 declaration 809 | error T_SEMI 810 ; 811 812 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 813 declaration: 814 begin_type_declmods end_type T_SEMI { 815 if (dcs->d_scl == TYPEDEF) { 816 /* typedef declares no type name */ 817 warning(72); 818 } else { 819 /* empty declaration */ 820 warning(2); 821 } 822 } 823 | begin_type_declmods end_type notype_init_declarators T_SEMI { 824 if (dcs->d_scl == TYPEDEF) { 825 /* syntax error '%s' */ 826 error(249, "missing base type for typedef"); 827 } else { 828 /* old-style declaration; add 'int' */ 829 error(1); 830 } 831 } 832 | begin_type_declaration_specifiers end_type T_SEMI { 833 if (dcs->d_scl == TYPEDEF) { 834 /* typedef declares no type name */ 835 warning(72); 836 } else if (!dcs->d_nonempty_decl) { 837 /* empty declaration */ 838 warning(2); 839 } 840 } 841 | begin_type_declaration_specifiers end_type 842 type_init_declarators T_SEMI 843 | static_assert_declaration 844 ; 845 846 begin_type_declaration_specifiers: /* see C99 6.7 */ 847 begin_type_typespec { 848 dcs_add_type($1); 849 } 850 | begin_type_declmods type_specifier { 851 dcs_add_type($2); 852 } 853 | type_attribute begin_type_declaration_specifiers 854 | begin_type_declaration_specifiers declmod 855 | begin_type_declaration_specifiers notype_type_specifier { 856 dcs_add_type($2); 857 } 858 ; 859 860 begin_type_declmods: /* see C99 6.7 */ 861 begin_type type_qualifier { 862 dcs_add_qualifiers($2); 863 } 864 | begin_type T_SCLASS { 865 dcs_add_storage_class($2); 866 } 867 | begin_type T_FUNCTION_SPECIFIER { 868 dcs_add_function_specifier($2); 869 } 870 | begin_type_declmods declmod 871 ; 872 873 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 874 begin_type_specifier_qualifier_list_postfix 875 | type_attribute_list begin_type_specifier_qualifier_list_postfix 876 ; 877 878 begin_type_specifier_qualifier_list_postfix: 879 begin_type_typespec { 880 dcs_add_type($1); 881 } 882 | begin_type_qualifier_list type_specifier { 883 dcs_add_type($2); 884 } 885 | begin_type_specifier_qualifier_list_postfix type_qualifier { 886 dcs_add_qualifiers($2); 887 } 888 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 889 dcs_add_type($2); 890 } 891 | begin_type_specifier_qualifier_list_postfix type_attribute 892 ; 893 894 begin_type_typespec: 895 begin_type notype_type_specifier { 896 $$ = $2; 897 } 898 | begin_type T_TYPENAME { 899 $$ = getsym($2)->s_type; 900 } 901 ; 902 903 begin_type_qualifier_list: 904 begin_type type_qualifier { 905 dcs_add_qualifiers($2); 906 } 907 | begin_type_qualifier_list type_qualifier { 908 dcs_add_qualifiers($2); 909 } 910 ; 911 912 declmod: 913 type_qualifier { 914 dcs_add_qualifiers($1); 915 } 916 | T_SCLASS { 917 dcs_add_storage_class($1); 918 } 919 | T_FUNCTION_SPECIFIER { 920 dcs_add_function_specifier($1); 921 } 922 | type_attribute_list 923 ; 924 925 type_attribute_list_opt: 926 /* empty */ 927 | type_attribute_list 928 ; 929 930 type_attribute_list: 931 type_attribute 932 | type_attribute_list type_attribute 933 ; 934 935 type_attribute_opt: 936 /* empty */ 937 | type_attribute 938 ; 939 940 type_attribute: /* See C11 6.7 declaration-specifiers */ 941 gcc_attribute_specifier 942 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 943 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 944 | T_PACKED { 945 dcs_add_packed(); 946 } 947 ; 948 949 begin_type: 950 /* empty */ { 951 dcs_begin_type(); 952 } 953 ; 954 955 end_type: 956 /* empty */ { 957 dcs_end_type(); 958 } 959 ; 960 961 type_specifier: /* C99 6.7.2 */ 962 notype_type_specifier 963 | T_TYPENAME { 964 $$ = getsym($1)->s_type; 965 } 966 ; 967 968 notype_type_specifier: /* see C99 6.7.2 */ 969 T_TYPE { 970 $$ = gettyp($1); 971 } 972 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 973 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 974 $$->t_typeof = true; 975 } 976 | atomic_type_specifier 977 | struct_or_union_specifier { 978 end_declaration_level(); 979 $$ = $1; 980 } 981 | enum_specifier { 982 end_declaration_level(); 983 $$ = $1; 984 } 985 ; 986 987 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 988 atomic_type_specifier: 989 atomic T_LPAREN type_name T_RPAREN { 990 $$ = $3; 991 } 992 ; 993 994 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 995 struct_or_union_specifier: 996 struct_or_union identifier_sym { 997 /* 998 * STDC requires that "struct a;" always introduces 999 * a new tag if "a" is not declared at current level 1000 * 1001 * yychar is valid because otherwise the parser would not 1002 * have been able to decide if it must shift or reduce 1003 */ 1004 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1005 } 1006 | struct_or_union identifier_sym { 1007 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1008 } braced_member_declaration_list { 1009 $$ = complete_struct_or_union($4); 1010 } 1011 | struct_or_union { 1012 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1013 } braced_member_declaration_list { 1014 $$ = complete_struct_or_union($3); 1015 } 1016 | struct_or_union error { 1017 set_sym_kind(SK_VCFT); 1018 $$ = gettyp(INT); 1019 } 1020 ; 1021 1022 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1023 struct_or_union: 1024 T_STRUCT_OR_UNION { 1025 set_sym_kind(SK_TAG); 1026 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1027 dcs->d_sou_size_in_bits = 0; 1028 dcs->d_sou_align_in_bits = CHAR_SIZE; 1029 $$ = $1; 1030 } 1031 | struct_or_union type_attribute 1032 ; 1033 1034 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1035 T_LBRACE { 1036 set_sym_kind(SK_VCFT); 1037 } member_declaration_list_with_rbrace { 1038 $$ = $3; 1039 } 1040 ; 1041 1042 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1043 member_declaration_list T_RBRACE 1044 | T_RBRACE { 1045 /* XXX: This is not allowed by any C standard. */ 1046 $$ = NULL; 1047 } 1048 ; 1049 1050 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1051 /* Was named struct_declaration_list until C11. */ 1052 member_declaration_list: 1053 member_declaration 1054 | member_declaration_list member_declaration { 1055 $$ = concat_symbols($1, $2); 1056 } 1057 ; 1058 1059 /* Was named struct_declaration until C11. */ 1060 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1061 member_declaration: 1062 begin_type_qualifier_list end_type { 1063 /* ^^ There is no check for the missing type-specifier. */ 1064 /* too late, i know, but getsym() compensates it */ 1065 set_sym_kind(SK_MEMBER); 1066 } notype_member_declarators T_SEMI { 1067 set_sym_kind(SK_VCFT); 1068 $$ = $4; 1069 } 1070 | begin_type_specifier_qualifier_list end_type { 1071 set_sym_kind(SK_MEMBER); 1072 } type_member_declarators T_SEMI { 1073 set_sym_kind(SK_VCFT); 1074 $$ = $4; 1075 } 1076 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1077 /* syntax error '%s' */ 1078 error(249, "member without type"); 1079 $$ = NULL; 1080 } 1081 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1082 T_SEMI { 1083 set_sym_kind(SK_VCFT); 1084 if (!allow_c11 && !allow_gcc) 1085 /* anonymous struct/union members is a C11 feature */ 1086 warning(49); 1087 if (is_struct_or_union(dcs->d_type->t_tspec)) 1088 $$ = declare_unnamed_member(); 1089 else { 1090 /* syntax error '%s' */ 1091 error(249, "unnamed member"); 1092 $$ = NULL; 1093 } 1094 } 1095 | static_assert_declaration { 1096 $$ = NULL; 1097 } 1098 | error T_SEMI { 1099 set_sym_kind(SK_VCFT); 1100 $$ = NULL; 1101 } 1102 ; 1103 1104 /* Was named struct_declarators until C11. */ 1105 notype_member_declarators: 1106 notype_member_declarator { 1107 $$ = declare_member($1); 1108 } 1109 | notype_member_declarators { 1110 set_sym_kind(SK_MEMBER); 1111 } T_COMMA type_member_declarator { 1112 $$ = concat_symbols($1, declare_member($4)); 1113 } 1114 ; 1115 1116 /* Was named struct_declarators until C11. */ 1117 type_member_declarators: 1118 type_member_declarator { 1119 $$ = declare_member($1); 1120 } 1121 | type_member_declarators { 1122 set_sym_kind(SK_MEMBER); 1123 } T_COMMA type_member_declarator { 1124 $$ = concat_symbols($1, declare_member($4)); 1125 } 1126 ; 1127 1128 /* Was named struct_declarator until C11. */ 1129 notype_member_declarator: 1130 notype_declarator 1131 /* C99 6.7.2.1 */ 1132 | notype_declarator T_COLON constant_expression { 1133 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1134 } 1135 /* C99 6.7.2.1 */ 1136 | { 1137 set_sym_kind(SK_VCFT); 1138 } T_COLON constant_expression { 1139 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1140 } 1141 ; 1142 1143 /* Was named struct_declarator until C11. */ 1144 type_member_declarator: 1145 type_declarator 1146 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1147 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1148 } 1149 | { 1150 set_sym_kind(SK_VCFT); 1151 } T_COLON constant_expression type_attribute_list_opt { 1152 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1153 } 1154 ; 1155 1156 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1157 enum_specifier: 1158 enum gcc_attribute_specifier_list_opt identifier_sym { 1159 $$ = make_tag_type($3, ENUM, false, false); 1160 } 1161 | enum gcc_attribute_specifier_list_opt identifier_sym { 1162 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1163 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1164 $$ = complete_enum($5); 1165 } 1166 | enum gcc_attribute_specifier_list_opt { 1167 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1168 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1169 $$ = complete_enum($4); 1170 } 1171 | enum error { 1172 set_sym_kind(SK_VCFT); 1173 $$ = gettyp(INT); 1174 } 1175 ; 1176 1177 enum: /* helper for C99 6.7.2.2 */ 1178 T_ENUM { 1179 set_sym_kind(SK_TAG); 1180 begin_declaration_level(DLK_ENUM); 1181 } 1182 ; 1183 1184 enum_declaration: /* helper for C99 6.7.2.2 */ 1185 T_LBRACE { 1186 set_sym_kind(SK_VCFT); 1187 enumval = 0; 1188 } enums_with_opt_comma T_RBRACE { 1189 $$ = $3; 1190 } 1191 ; 1192 1193 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1194 enumerator_list 1195 | enumerator_list T_COMMA { 1196 if (!allow_c99 && !allow_trad) { 1197 /* trailing ',' in enum declaration requires C99 ... */ 1198 error(54); 1199 } else { 1200 /* trailing ',' in enum declaration requires C99 ... */ 1201 c99ism(54); 1202 } 1203 $$ = $1; 1204 } 1205 ; 1206 1207 enumerator_list: /* C99 6.7.2.2 */ 1208 enumerator 1209 | enumerator_list T_COMMA enumerator { 1210 $$ = concat_symbols($1, $3); 1211 } 1212 | error { 1213 $$ = NULL; 1214 } 1215 ; 1216 1217 enumerator: /* C99 6.7.2.2 */ 1218 identifier_sym gcc_attribute_specifier_list_opt { 1219 $$ = enumeration_constant($1, enumval, true); 1220 } 1221 | identifier_sym gcc_attribute_specifier_list_opt 1222 T_ASSIGN constant_expression { 1223 $$ = enumeration_constant($1, to_int_constant($4, true), 1224 false); 1225 } 1226 ; 1227 1228 type_qualifier: /* C99 6.7.3 */ 1229 T_QUAL 1230 | atomic { 1231 $$ = (type_qualifiers){ .tq_atomic = true }; 1232 } 1233 ; 1234 1235 atomic: /* helper */ 1236 T_ATOMIC { 1237 /* TODO: First fix c11ism, then use it here. */ 1238 if (!allow_c11) 1239 /* '_Atomic' requires C11 or later */ 1240 error(350); 1241 } 1242 ; 1243 1244 pointer: /* C99 6.7.5 */ 1245 T_ASTERISK type_qualifier_list_opt { 1246 $$ = xcalloc(1, sizeof(*$$)); 1247 add_type_qualifiers(&$$->qualifiers, $2); 1248 } 1249 | T_ASTERISK type_qualifier_list_opt pointer { 1250 $$ = xcalloc(1, sizeof(*$$)); 1251 add_type_qualifiers(&$$->qualifiers, $2); 1252 $$ = append_qualified_pointer($$, $3); 1253 } 1254 ; 1255 1256 type_qualifier_list_opt: /* see C99 6.7.5 */ 1257 /* empty */ { 1258 $$ = (type_qualifiers){ .tq_const = false }; 1259 } 1260 | type_qualifier_list 1261 ; 1262 1263 type_qualifier_list: /* C99 6.7.5 */ 1264 type_qualifier 1265 | type_qualifier_list type_qualifier { 1266 $$ = $1; 1267 add_type_qualifiers(&$$, $2); 1268 } 1269 ; 1270 1271 /* 1272 * For an explanation of 'notype' in the following rules, see 1273 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1274 */ 1275 1276 notype_init_declarators: 1277 notype_init_declarator 1278 | notype_init_declarators T_COMMA type_init_declarator 1279 ; 1280 1281 type_init_declarators: 1282 type_init_declarator 1283 | type_init_declarators T_COMMA type_init_declarator 1284 ; 1285 1286 notype_init_declarator: 1287 notype_declarator asm_or_symbolrename_opt { 1288 cgram_declare($1, false, $2); 1289 check_size($1); 1290 } 1291 | notype_declarator asm_or_symbolrename_opt { 1292 begin_initialization($1); 1293 cgram_declare($1, true, $2); 1294 } T_ASSIGN initializer { 1295 check_size($1); 1296 end_initialization(); 1297 } 1298 ; 1299 1300 type_init_declarator: 1301 type_declarator asm_or_symbolrename_opt { 1302 cgram_declare($1, false, $2); 1303 check_size($1); 1304 } 1305 | type_declarator asm_or_symbolrename_opt { 1306 begin_initialization($1); 1307 cgram_declare($1, true, $2); 1308 } T_ASSIGN initializer { 1309 check_size($1); 1310 end_initialization(); 1311 } 1312 ; 1313 1314 notype_declarator: 1315 notype_direct_declarator 1316 | pointer notype_direct_declarator { 1317 $$ = add_pointer($2, $1); 1318 } 1319 ; 1320 1321 type_declarator: 1322 type_direct_declarator 1323 | pointer type_direct_declarator { 1324 $$ = add_pointer($2, $1); 1325 } 1326 ; 1327 1328 notype_direct_declarator: 1329 type_attribute_list_opt T_NAME { 1330 $$ = declarator_name(getsym($2)); 1331 } 1332 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1333 $$ = $3; 1334 } 1335 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1336 $$ = add_array($1, $3.has_dim, $3.dim); 1337 } 1338 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1339 $$ = add_function(symbolrename($1, $3), $2); 1340 end_declaration_level(); 1341 block_level--; 1342 } 1343 | notype_direct_declarator type_attribute 1344 ; 1345 1346 type_direct_declarator: 1347 type_attribute_list_opt identifier { 1348 $$ = declarator_name(getsym($2)); 1349 } 1350 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1351 $$ = $3; 1352 } 1353 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1354 $$ = add_array($1, $3.has_dim, $3.dim); 1355 } 1356 | type_direct_declarator param_list asm_or_symbolrename_opt { 1357 $$ = add_function(symbolrename($1, $3), $2); 1358 end_declaration_level(); 1359 block_level--; 1360 } 1361 | type_direct_declarator type_attribute 1362 ; 1363 1364 /* 1365 * The two distinct rules type_param_declarator and notype_param_declarator 1366 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1367 * always treated as a typename, not an argument name. For example, after 1368 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1369 * "f(int (double));", not "f(int a);". 1370 */ 1371 type_param_declarator: 1372 direct_param_declarator 1373 | pointer direct_param_declarator { 1374 $$ = add_pointer($2, $1); 1375 } 1376 ; 1377 1378 notype_param_declarator: 1379 direct_notype_param_declarator 1380 | pointer direct_notype_param_declarator { 1381 $$ = add_pointer($2, $1); 1382 } 1383 ; 1384 1385 direct_param_declarator: 1386 identifier type_attribute_list { 1387 $$ = declarator_name(getsym($1)); 1388 } 1389 | identifier { 1390 $$ = declarator_name(getsym($1)); 1391 } 1392 | T_LPAREN notype_param_declarator T_RPAREN { 1393 $$ = $2; 1394 } 1395 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1396 gcc_attribute_specifier_list_opt { 1397 $$ = add_array($1, $3.has_dim, $3.dim); 1398 } 1399 | direct_param_declarator param_list asm_or_symbolrename_opt { 1400 $$ = add_function(symbolrename($1, $3), $2); 1401 end_declaration_level(); 1402 block_level--; 1403 } 1404 ; 1405 1406 direct_notype_param_declarator: 1407 identifier { 1408 $$ = declarator_name(getsym($1)); 1409 } 1410 | T_LPAREN notype_param_declarator T_RPAREN { 1411 $$ = $2; 1412 } 1413 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1414 $$ = add_array($1, $3.has_dim, $3.dim); 1415 } 1416 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1417 $$ = add_function(symbolrename($1, $3), $2); 1418 end_declaration_level(); 1419 block_level--; 1420 } 1421 ; 1422 1423 param_list: 1424 T_LPAREN { 1425 block_level++; 1426 begin_declaration_level(DLK_PROTO_PARAMS); 1427 } identifier_list T_RPAREN { 1428 $$ = (struct parameter_list){ .first = $3 }; 1429 } 1430 | abstract_decl_param_list 1431 ; 1432 1433 array_size_opt: 1434 /* empty */ { 1435 $$.has_dim = false; 1436 $$.dim = 0; 1437 } 1438 | T_ASTERISK { 1439 /* since C99; variable length array of unspecified size */ 1440 $$.has_dim = false; /* TODO: maybe change to true */ 1441 $$.dim = 0; /* just as a placeholder */ 1442 } 1443 | type_qualifier_list_opt T_SCLASS constant_expression { 1444 /* C11 6.7.6.3p7 */ 1445 if ($2 != STATIC) 1446 yyerror("Bad attribute"); 1447 /* static array size requires C11 or later */ 1448 c11ism(343); 1449 $$.has_dim = true; 1450 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1451 } 1452 | type_qualifier { 1453 /* C11 6.7.6.2 */ 1454 if (!$1.tq_restrict) 1455 yyerror("Bad attribute"); 1456 $$.has_dim = true; 1457 $$.dim = 0; 1458 } 1459 | constant_expression { 1460 $$.has_dim = true; 1461 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1462 } 1463 ; 1464 1465 identifier_list: /* C99 6.7.5 */ 1466 T_NAME { 1467 $$ = old_style_function_parameter_name(getsym($1)); 1468 } 1469 | identifier_list T_COMMA T_NAME { 1470 $$ = concat_symbols($1, 1471 old_style_function_parameter_name(getsym($3))); 1472 } 1473 | identifier_list error 1474 ; 1475 1476 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1477 type_name: /* C99 6.7.6 */ 1478 { 1479 begin_declaration_level(DLK_ABSTRACT); 1480 } abstract_declaration { 1481 end_declaration_level(); 1482 $$ = $2->s_type; 1483 } 1484 ; 1485 1486 abstract_declaration: /* specific to lint */ 1487 begin_type_qualifier_list end_type { 1488 $$ = declare_abstract_type(abstract_name()); 1489 } 1490 | begin_type_specifier_qualifier_list end_type { 1491 $$ = declare_abstract_type(abstract_name()); 1492 } 1493 | begin_type_qualifier_list end_type abstract_declarator { 1494 $$ = declare_abstract_type($3); 1495 } 1496 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1497 $$ = declare_abstract_type($3); 1498 } 1499 ; 1500 1501 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1502 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1503 abstract_declarator: 1504 pointer { 1505 $$ = add_pointer(abstract_name(), $1); 1506 } 1507 | direct_abstract_declarator 1508 | pointer direct_abstract_declarator { 1509 $$ = add_pointer($2, $1); 1510 } 1511 | type_attribute_list direct_abstract_declarator { 1512 $$ = $2; 1513 } 1514 | pointer type_attribute_list direct_abstract_declarator { 1515 $$ = add_pointer($3, $1); 1516 } 1517 ; 1518 1519 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1520 direct_abstract_declarator: 1521 /* TODO: sort rules according to C99 */ 1522 T_LPAREN abstract_declarator T_RPAREN { 1523 $$ = $2; 1524 } 1525 | T_LBRACK array_size_opt T_RBRACK { 1526 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1527 } 1528 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1529 $$ = add_array($1, $3.has_dim, $3.dim); 1530 } 1531 | abstract_decl_param_list asm_or_symbolrename_opt { 1532 sym_t *name = abstract_enclosing_name(); 1533 $$ = add_function(symbolrename(name, $2), $1); 1534 end_declaration_level(); 1535 block_level--; 1536 } 1537 | direct_abstract_declarator abstract_decl_param_list 1538 asm_or_symbolrename_opt { 1539 $$ = add_function(symbolrename($1, $3), $2); 1540 end_declaration_level(); 1541 block_level--; 1542 } 1543 | direct_abstract_declarator type_attribute_list 1544 ; 1545 1546 abstract_decl_param_list: /* specific to lint */ 1547 abstract_decl_lparen T_RPAREN type_attribute_opt { 1548 $$ = (struct parameter_list){ .first = NULL }; 1549 } 1550 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1551 type_attribute_opt { 1552 $$ = $2; 1553 $$.prototype = true; 1554 } 1555 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1556 $$ = (struct parameter_list){ .first = NULL }; 1557 } 1558 ; 1559 1560 abstract_decl_lparen: /* specific to lint */ 1561 T_LPAREN { 1562 block_level++; 1563 begin_declaration_level(DLK_PROTO_PARAMS); 1564 } 1565 ; 1566 1567 vararg_parameter_type_list: /* specific to lint */ 1568 parameter_type_list 1569 | parameter_type_list T_COMMA T_ELLIPSIS { 1570 $$ = $1; 1571 $$.vararg = true; 1572 } 1573 | T_ELLIPSIS { 1574 /* TODO: C99 6.7.5 makes this an error as well. */ 1575 if (!allow_trad && !allow_c99) { 1576 /* C90 to C17 require formal parameter before '...' */ 1577 error(84); 1578 } else if (allow_c90) { 1579 /* C90 to C17 require formal parameter before '...' */ 1580 warning(84); 1581 } 1582 $$ = (struct parameter_list){ .vararg = true }; 1583 } 1584 ; 1585 1586 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1587 parameter_type_list: 1588 parameter_declaration { 1589 $$ = (struct parameter_list){ .first = $1 }; 1590 } 1591 | parameter_type_list T_COMMA parameter_declaration { 1592 $$ = $1; 1593 $$.first = concat_symbols($1.first, $3); 1594 } 1595 ; 1596 1597 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1598 parameter_declaration: 1599 begin_type_declmods end_type { 1600 /* ^^ There is no check for the missing type-specifier. */ 1601 $$ = declare_parameter(abstract_name(), false); 1602 } 1603 | begin_type_declaration_specifiers end_type { 1604 $$ = declare_parameter(abstract_name(), false); 1605 } 1606 | begin_type_declmods end_type notype_param_declarator { 1607 /* ^^ There is no check for the missing type-specifier. */ 1608 $$ = declare_parameter($3, false); 1609 } 1610 /* 1611 * type_param_declarator is needed because of following conflict: 1612 * "typedef int a; f(int (a));" could be parsed as 1613 * "function with argument a of type int", or 1614 * "function with an unnamed (abstract) argument of type function". 1615 * This grammar realizes the second case. 1616 */ 1617 | begin_type_declaration_specifiers end_type type_param_declarator { 1618 $$ = declare_parameter($3, false); 1619 } 1620 | begin_type_declmods end_type abstract_declarator { 1621 /* ^^ There is no check for the missing type-specifier. */ 1622 $$ = declare_parameter($3, false); 1623 } 1624 | begin_type_declaration_specifiers end_type abstract_declarator { 1625 $$ = declare_parameter($3, false); 1626 } 1627 ; 1628 1629 braced_initializer: 1630 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1631 init_lbrace init_rbrace { 1632 /* empty initializer braces require C23 or later */ 1633 c23ism(353); 1634 } 1635 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1636 | init_lbrace initializer_list init_rbrace 1637 | init_lbrace initializer_list T_COMMA init_rbrace 1638 ; 1639 1640 initializer: /* C99 6.7.8 "Initialization" */ 1641 assignment_expression { 1642 init_expr($1); 1643 } 1644 | init_lbrace init_rbrace { 1645 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1646 } 1647 | init_lbrace initializer_list init_rbrace 1648 | init_lbrace initializer_list T_COMMA init_rbrace 1649 /* XXX: What is this error handling for? */ 1650 | error 1651 ; 1652 1653 initializer_list: /* C99 6.7.8 "Initialization" */ 1654 initializer 1655 | designation initializer 1656 | initializer_list T_COMMA initializer 1657 | initializer_list T_COMMA designation initializer 1658 ; 1659 1660 designation: /* C99 6.7.8 "Initialization" */ 1661 { 1662 begin_designation(); 1663 } designator_list T_ASSIGN 1664 | identifier T_COLON { 1665 /* GCC style struct or union member name in initializer */ 1666 gnuism(315); 1667 begin_designation(); 1668 add_designator_member($1); 1669 } 1670 ; 1671 1672 designator_list: /* C99 6.7.8 "Initialization" */ 1673 designator 1674 | designator_list designator 1675 ; 1676 1677 designator: /* C99 6.7.8 "Initialization" */ 1678 T_LBRACK range T_RBRACK { 1679 if (!allow_c99) 1680 /* array initializer with designators is a C99 ... */ 1681 warning(321); 1682 add_designator_subscript($2); 1683 } 1684 | T_POINT identifier { 1685 if (!allow_c99) 1686 /* struct or union member name in initializer is ... */ 1687 warning(313); 1688 add_designator_member($2); 1689 } 1690 ; 1691 1692 static_assert_declaration: 1693 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1694 T_RPAREN T_SEMI { 1695 /* '_Static_assert' requires C11 or later */ 1696 c11ism(354); 1697 } 1698 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1699 /* '_Static_assert' without message requires C23 or later */ 1700 c23ism(355); 1701 } 1702 ; 1703 1704 range: 1705 constant_expression { 1706 $$.lo = to_int_constant($1, true); 1707 $$.hi = $$.lo; 1708 } 1709 | constant_expression T_ELLIPSIS constant_expression { 1710 $$.lo = to_int_constant($1, true); 1711 $$.hi = to_int_constant($3, true); 1712 /* initialization with '[a...b]' is a GCC extension */ 1713 gnuism(340); 1714 } 1715 ; 1716 1717 init_lbrace: /* helper */ 1718 T_LBRACE { 1719 init_lbrace(); 1720 } 1721 ; 1722 1723 init_rbrace: /* helper */ 1724 T_RBRACE { 1725 init_rbrace(); 1726 } 1727 ; 1728 1729 asm_or_symbolrename_opt: /* GCC extensions */ 1730 /* empty */ { 1731 $$ = NULL; 1732 } 1733 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1734 freeyyv(&$3, T_STRING); 1735 $$ = NULL; 1736 } 1737 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1738 gcc_attribute_specifier_list_opt { 1739 $$ = $3; 1740 } 1741 ; 1742 1743 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1744 statement: 1745 expression_statement 1746 | non_expr_statement 1747 ; 1748 1749 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1750 no_attr_statement: 1751 expression_statement 1752 | no_attr_non_expr_statement 1753 ; 1754 1755 non_expr_statement: /* helper for C99 6.8 */ 1756 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1757 | no_attr_non_expr_statement 1758 ; 1759 1760 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1761 no_attr_non_expr_statement: 1762 labeled_statement 1763 | compound_statement 1764 | selection_statement 1765 | iteration_statement 1766 | jump_statement { 1767 suppress_fallthrough = false; 1768 } 1769 | asm_statement 1770 ; 1771 1772 labeled_statement: /* C99 6.8.1 */ 1773 label gcc_attribute_specifier_list_opt no_attr_statement 1774 ; 1775 1776 label: 1777 T_NAME T_COLON { 1778 set_sym_kind(SK_LABEL); 1779 named_label(getsym($1)); 1780 } 1781 | T_CASE constant_expression T_COLON { 1782 case_label($2); 1783 suppress_fallthrough = true; 1784 } 1785 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1786 /* XXX: We don't fill all cases */ 1787 case_label($2); 1788 suppress_fallthrough = true; 1789 } 1790 | T_DEFAULT T_COLON { 1791 default_label(); 1792 suppress_fallthrough = true; 1793 } 1794 ; 1795 1796 compound_statement: /* C99 6.8.2 */ 1797 compound_statement_lbrace compound_statement_rbrace 1798 | compound_statement_lbrace block_item_list compound_statement_rbrace 1799 ; 1800 1801 compound_statement_lbrace: 1802 T_LBRACE { 1803 block_level++; 1804 mem_block_level++; 1805 debug_step("%s: mem_block_level = %zu", 1806 "compound_statement_lbrace", mem_block_level); 1807 begin_declaration_level(DLK_AUTO); 1808 } 1809 ; 1810 1811 compound_statement_rbrace: 1812 T_RBRACE { 1813 end_declaration_level(); 1814 if (!in_statement_expr()) 1815 level_free_all(mem_block_level); /* leak */ 1816 mem_block_level--; 1817 debug_step("%s: mem_block_level = %zu", 1818 "compound_statement_rbrace", mem_block_level); 1819 block_level--; 1820 suppress_fallthrough = false; 1821 } 1822 ; 1823 1824 block_item_list: /* C99 6.8.2 */ 1825 block_item 1826 | block_item_list block_item { 1827 if ($1 && !$2) 1828 /* declarations after statements is a C99 feature */ 1829 c99ism(327); 1830 $$ = $1 || $2; 1831 } 1832 ; 1833 1834 block_item: /* C99 6.8.2 */ 1835 declaration_or_error { 1836 $$ = false; 1837 restore_warning_flags(); 1838 } 1839 | statement { 1840 $$ = true; 1841 restore_warning_flags(); 1842 } 1843 ; 1844 1845 expression_statement: /* C99 6.8.3 */ 1846 expression T_SEMI { 1847 expr($1, false, false, false, false); 1848 suppress_fallthrough = false; 1849 } 1850 | T_SEMI { 1851 check_statement_reachable(); 1852 suppress_fallthrough = false; 1853 } 1854 ; 1855 1856 selection_statement: /* C99 6.8.4 */ 1857 if_without_else %prec T_THEN { 1858 save_warning_flags(); 1859 stmt_if_then_stmt(); 1860 stmt_if_else_stmt(false); 1861 } 1862 | if_without_else T_ELSE { 1863 save_warning_flags(); 1864 stmt_if_then_stmt(); 1865 } statement { 1866 clear_warning_flags(); 1867 stmt_if_else_stmt(true); 1868 } 1869 | if_without_else T_ELSE error { 1870 clear_warning_flags(); 1871 stmt_if_else_stmt(false); 1872 } 1873 | switch_expr statement { 1874 clear_warning_flags(); 1875 stmt_switch_expr_stmt(); 1876 } 1877 | switch_expr error { 1878 clear_warning_flags(); 1879 stmt_switch_expr_stmt(); 1880 } 1881 ; 1882 1883 if_without_else: /* see C99 6.8.4 */ 1884 if_expr statement 1885 | if_expr error 1886 ; 1887 1888 if_expr: /* see C99 6.8.4 */ 1889 T_IF T_LPAREN expression T_RPAREN { 1890 stmt_if_expr($3); 1891 clear_warning_flags(); 1892 } 1893 ; 1894 1895 switch_expr: /* see C99 6.8.4 */ 1896 T_SWITCH T_LPAREN expression T_RPAREN { 1897 stmt_switch_expr($3); 1898 clear_warning_flags(); 1899 } 1900 ; 1901 1902 iteration_statement: /* C99 6.8.5 */ 1903 while_expr statement { 1904 clear_warning_flags(); 1905 stmt_while_expr_stmt(); 1906 } 1907 | while_expr error { 1908 clear_warning_flags(); 1909 stmt_while_expr_stmt(); 1910 } 1911 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1912 stmt_do_while_expr($4); 1913 suppress_fallthrough = false; 1914 } 1915 | do error { 1916 clear_warning_flags(); 1917 stmt_do_while_expr(NULL); 1918 } 1919 | for_exprs statement { 1920 clear_warning_flags(); 1921 stmt_for_exprs_stmt(); 1922 end_declaration_level(); 1923 block_level--; 1924 } 1925 | for_exprs error { 1926 clear_warning_flags(); 1927 stmt_for_exprs_stmt(); 1928 end_declaration_level(); 1929 block_level--; 1930 } 1931 ; 1932 1933 while_expr: /* see C99 6.8.5 */ 1934 T_WHILE T_LPAREN expression T_RPAREN { 1935 stmt_while_expr($3); 1936 clear_warning_flags(); 1937 } 1938 ; 1939 1940 do_statement: /* see C99 6.8.5 */ 1941 do statement { 1942 clear_warning_flags(); 1943 } 1944 ; 1945 1946 do: /* see C99 6.8.5 */ 1947 T_DO { 1948 stmt_do(); 1949 } 1950 ; 1951 1952 for_start: /* see C99 6.8.5 */ 1953 T_FOR T_LPAREN { 1954 begin_declaration_level(DLK_AUTO); 1955 block_level++; 1956 } 1957 ; 1958 1959 for_exprs: /* see C99 6.8.5 */ 1960 for_start 1961 begin_type_declaration_specifiers end_type 1962 notype_init_declarators T_SEMI 1963 expression_opt T_SEMI 1964 expression_opt T_RPAREN { 1965 /* variable declaration in for loop */ 1966 c99ism(325); 1967 stmt_for_exprs(NULL, $6, $8); 1968 clear_warning_flags(); 1969 } 1970 | for_start 1971 expression_opt T_SEMI 1972 expression_opt T_SEMI 1973 expression_opt T_RPAREN { 1974 stmt_for_exprs($2, $4, $6); 1975 clear_warning_flags(); 1976 } 1977 ; 1978 1979 jump_statement: /* C99 6.8.6 */ 1980 goto identifier T_SEMI { 1981 stmt_goto(getsym($2)); 1982 } 1983 | goto error T_SEMI { 1984 set_sym_kind(SK_VCFT); 1985 } 1986 | T_CONTINUE T_SEMI { 1987 stmt_continue(); 1988 } 1989 | T_BREAK T_SEMI { 1990 stmt_break(); 1991 } 1992 | T_RETURN sys T_SEMI { 1993 stmt_return($2, NULL); 1994 } 1995 | T_RETURN sys expression T_SEMI { 1996 stmt_return($2, $3); 1997 } 1998 ; 1999 2000 goto: /* see C99 6.8.6 */ 2001 T_GOTO { 2002 set_sym_kind(SK_LABEL); 2003 } 2004 ; 2005 2006 asm_statement: /* GCC extension */ 2007 T_ASM T_LPAREN read_until_rparen T_SEMI { 2008 dcs_set_asm(); 2009 } 2010 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2011 dcs_set_asm(); 2012 } 2013 | T_ASM error 2014 ; 2015 2016 read_until_rparen: /* helper for 'asm_statement' */ 2017 /* empty */ { 2018 read_until_rparen(); 2019 } 2020 ; 2021 2022 translation_unit: /* C99 6.9 */ 2023 external_declaration 2024 | translation_unit external_declaration 2025 ; 2026 2027 external_declaration: /* C99 6.9 */ 2028 function_definition { 2029 global_clean_up_decl(false); 2030 clear_warning_flags(); 2031 } 2032 | top_level_declaration { 2033 global_clean_up_decl(false); 2034 clear_warning_flags(); 2035 } 2036 | asm_statement /* GCC extension */ 2037 | T_SEMI { /* GCC extension */ 2038 /* 2039 * TODO: Only allow this in GCC mode, not in plain C99. 2040 * This is one of the top 10 warnings in the NetBSD build. 2041 */ 2042 if (!allow_trad && !allow_c99) { 2043 /* empty declaration */ 2044 error(0); 2045 } else if (allow_c90) { 2046 /* empty declaration */ 2047 warning(0); 2048 } 2049 } 2050 ; 2051 2052 /* 2053 * On the top level, lint allows several forms of declarations that it doesn't 2054 * allow in functions. For example, a single ';' is an empty declaration and 2055 * is supported by some compilers, but in a function it would be an empty 2056 * statement, not a declaration. This makes a difference in C90 mode, where 2057 * a statement must not be followed by a declaration. 2058 * 2059 * See 'declaration' for all other declarations. 2060 */ 2061 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2062 begin_type end_type notype_init_declarators T_SEMI { 2063 /* TODO: Make this an error in C99 mode as well. */ 2064 if (!allow_trad && !allow_c99) { 2065 /* old-style declaration; add 'int' */ 2066 error(1); 2067 } else if (allow_c90) { 2068 /* old-style declaration; add 'int' */ 2069 warning(1); 2070 } 2071 } 2072 | declaration 2073 | error T_SEMI { 2074 global_clean_up(); 2075 } 2076 | error T_RBRACE { 2077 global_clean_up(); 2078 } 2079 ; 2080 2081 function_definition: /* C99 6.9.1 */ 2082 func_declarator { 2083 if ($1->s_type->t_tspec != FUNC) { 2084 /* syntax error '%s' */ 2085 error(249, yytext); 2086 YYERROR; 2087 } 2088 if ($1->s_type->t_typedef) { 2089 /* ()-less function definition */ 2090 error(64); 2091 YYERROR; 2092 } 2093 check_extern_declaration($1); 2094 begin_function($1); 2095 block_level++; 2096 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2097 if (lwarn == LWARN_NONE) 2098 $1->s_used = true; 2099 } arg_declaration_list_opt { 2100 end_declaration_level(); 2101 block_level--; 2102 check_func_lint_directives(); 2103 check_func_old_style_parameters(); 2104 begin_control_statement(CS_FUNCTION_BODY); 2105 } compound_statement { 2106 end_function(); 2107 end_control_statement(CS_FUNCTION_BODY); 2108 } 2109 ; 2110 2111 func_declarator: 2112 begin_type end_type notype_declarator { 2113 if (!allow_trad) { 2114 /* old-style declaration; add 'int' */ 2115 error(1); 2116 } 2117 $$ = $3; 2118 } 2119 | begin_type_declmods end_type notype_declarator { 2120 if (!allow_trad) { 2121 /* old-style declaration; add 'int' */ 2122 error(1); 2123 } 2124 $$ = $3; 2125 } 2126 | begin_type_declaration_specifiers end_type type_declarator { 2127 $$ = $3; 2128 } 2129 ; 2130 2131 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2132 /* empty */ 2133 | arg_declaration_list 2134 ; 2135 2136 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2137 arg_declaration 2138 | arg_declaration_list arg_declaration 2139 /* XXX or better "arg_declaration error" ? */ 2140 | error 2141 ; 2142 2143 /* 2144 * "arg_declaration" is separated from "declaration" because it 2145 * needs other error handling. 2146 */ 2147 arg_declaration: 2148 begin_type_declmods end_type T_SEMI { 2149 /* empty declaration */ 2150 warning(2); 2151 } 2152 | begin_type_declmods end_type notype_init_declarators T_SEMI 2153 | begin_type_declaration_specifiers end_type T_SEMI { 2154 if (!dcs->d_nonempty_decl) { 2155 /* empty declaration */ 2156 warning(2); 2157 } else { 2158 /* '%s' declared in parameter declaration list */ 2159 warning(3, type_name(dcs->d_type)); 2160 } 2161 } 2162 | begin_type_declaration_specifiers end_type 2163 type_init_declarators T_SEMI { 2164 if (dcs->d_nonempty_decl) { 2165 /* '%s' declared in parameter declaration list */ 2166 warning(3, type_name(dcs->d_type)); 2167 } 2168 } 2169 | begin_type_declmods error 2170 | begin_type_declaration_specifiers error 2171 ; 2172 2173 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2174 gcc_attribute_specifier_list_opt: 2175 /* empty */ 2176 | gcc_attribute_specifier_list 2177 ; 2178 2179 gcc_attribute_specifier_list: 2180 gcc_attribute_specifier 2181 | gcc_attribute_specifier_list gcc_attribute_specifier 2182 ; 2183 2184 gcc_attribute_specifier: 2185 T_ATTRIBUTE T_LPAREN T_LPAREN { 2186 in_gcc_attribute = true; 2187 } gcc_attribute_list { 2188 in_gcc_attribute = false; 2189 } T_RPAREN T_RPAREN 2190 ; 2191 2192 gcc_attribute_list: 2193 gcc_attribute 2194 | gcc_attribute_list T_COMMA gcc_attribute 2195 ; 2196 2197 gcc_attribute: 2198 /* empty */ 2199 | T_NAME { 2200 const char *name = $1->sb_name; 2201 if (is_either(name, "packed", "__packed__")) 2202 dcs_add_packed(); 2203 else if (is_either(name, "used", "__used__") || 2204 is_either(name, "unused", "__unused__")) 2205 dcs_set_used(); 2206 else if (is_either(name, "fallthrough", "__fallthrough__")) 2207 suppress_fallthrough = true; 2208 } 2209 | T_NAME T_LPAREN T_RPAREN 2210 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2211 | type_qualifier { 2212 if (!$1.tq_const) 2213 yyerror("Bad attribute"); 2214 } 2215 ; 2216 2217 gcc_attribute_parameters: 2218 constant_expression 2219 | gcc_attribute_parameters T_COMMA constant_expression 2220 ; 2221 2222 sys: 2223 /* empty */ { 2224 $$ = in_system_header; 2225 } 2226 ; 2227 2228 %% 2229 2230 /* ARGSUSED */ 2231 int 2232 yyerror(const char *msg) 2233 { 2234 /* syntax error '%s' */ 2235 error(249, yytext); 2236 if (++sytxerr >= 5) 2237 norecover(); 2238 return 0; 2239 } 2240 2241 #if YYDEBUG && YYBYACC 2242 static const char * 2243 cgram_to_string(int token, YYSTYPE val) 2244 { 2245 2246 switch (token) { 2247 case T_INCDEC: 2248 return val.y_inc ? "++" : "--"; 2249 case T_MULTIPLICATIVE: 2250 case T_ADDITIVE: 2251 case T_SHIFT: 2252 case T_RELATIONAL: 2253 case T_EQUALITY: 2254 case T_OPASSIGN: 2255 return op_name(val.y_op); 2256 case T_SCLASS: 2257 return scl_name(val.y_scl); 2258 case T_TYPE: 2259 case T_STRUCT_OR_UNION: 2260 return tspec_name(val.y_tspec); 2261 case T_QUAL: 2262 return type_qualifiers_string(val.y_type_qualifiers); 2263 case T_FUNCTION_SPECIFIER: 2264 return function_specifier_name(val.y_function_specifier); 2265 case T_NAME: 2266 return val.y_name->sb_name; 2267 default: 2268 return "<none>"; 2269 } 2270 } 2271 #endif 2272 2273 static void 2274 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2275 { 2276 declare(decl, has_initializer, renaming); 2277 if (renaming != NULL) 2278 freeyyv(&renaming, T_NAME); 2279 } 2280 2281 /* 2282 * Discard all input tokens up to and including the next unmatched right 2283 * parenthesis. 2284 */ 2285 static void 2286 read_until_rparen(void) 2287 { 2288 int level; 2289 2290 if (yychar < 0) 2291 yychar = yylex(); 2292 freeyyv(&yylval, yychar); 2293 2294 level = 1; 2295 while (yychar > 0) { 2296 if (yychar == T_LPAREN) 2297 level++; 2298 if (yychar == T_RPAREN && --level == 0) 2299 break; 2300 freeyyv(&yylval, yychar = yylex()); 2301 } 2302 2303 yyclearin; 2304 } 2305 2306 static sym_t * 2307 symbolrename(sym_t *s, sbuf_t *sb) 2308 { 2309 if (sb != NULL) 2310 s->s_rename = sb->sb_name; 2311 return s; 2312 } 2313
Indexes created Fri Oct 03 02:09:57 GMT 2025