cgram.y revision 1.476
1 %{ 2 /* $NetBSD: cgram.y,v 1.476 2023/10/17 19:33:16 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 1.476 2023/10/17 19:33:16 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 }; 158 159 /* for Bison: 160 %printer { 161 if (is_integer($$->v_tspec)) 162 fprintf(yyo, "%lld", (long long)$$->u.integer); 163 else 164 fprintf(yyo, "%Lg", $$->u.floating); 165 } <y_val> 166 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 167 %printer { 168 bool indented = debug_push_indented(true); 169 debug_sym("", $$, ""); 170 debug_pop_indented(indented); 171 } <y_sym> 172 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 173 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 174 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 175 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 176 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 177 %printer { 178 fprintf(yyo, "%s", function_specifier_name($$)); 179 } <y_function_specifier> 180 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 181 %printer { 182 if ($$ == NULL) 183 fprintf(yyo, "<null>"); 184 else 185 fprintf(yyo, "%s '%s'", 186 op_name($$->tn_op), type_name($$->tn_type)); 187 } <y_tnode> 188 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 189 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 190 %printer { 191 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 192 } <y_qual_ptr> 193 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 194 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 195 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 196 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 197 */ 198 199 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 200 %token T_POINT T_ARROW 201 %token T_COMPLEMENT T_LOGNOT 202 %token <y_inc> T_INCDEC 203 %token T_SIZEOF 204 %token T_BUILTIN_OFFSETOF 205 %token T_TYPEOF 206 %token T_EXTENSION 207 %token T_ALIGNAS 208 %token T_ALIGNOF 209 %token T_ASTERISK 210 %token <y_op> T_MULTIPLICATIVE 211 %token <y_op> T_ADDITIVE 212 %token <y_op> T_SHIFT 213 %token <y_op> T_RELATIONAL 214 %token <y_op> T_EQUALITY 215 %token T_AMPER 216 %token T_BITXOR 217 %token T_BITOR 218 %token T_LOGAND 219 %token T_LOGOR 220 %token T_QUEST 221 %token T_COLON 222 %token T_ASSIGN 223 %token <y_op> T_OPASSIGN 224 %token T_COMMA 225 %token T_SEMI 226 %token T_ELLIPSIS 227 %token T_REAL 228 %token T_IMAG 229 %token T_GENERIC 230 231 /* storage classes (extern, static, auto, register and typedef) */ 232 %token <y_scl> T_SCLASS 233 %token <y_function_specifier> T_FUNCTION_SPECIFIER 234 235 /* 236 * predefined type keywords (char, int, short, long, unsigned, signed, 237 * float, double, void); see T_TYPENAME for types from typedef 238 */ 239 %token <y_tspec> T_TYPE 240 241 %token <y_type_qualifiers> T_QUAL 242 %token <y_type_qualifiers> T_ATOMIC 243 244 /* struct or union */ 245 %token <y_tspec> T_STRUCT_OR_UNION 246 247 /* remaining keywords */ 248 %token T_ASM 249 %token T_BREAK 250 %token T_CASE 251 %token T_CONTINUE 252 %token T_DEFAULT 253 %token T_DO 254 %token T_ELSE 255 %token T_ENUM 256 %token T_FOR 257 %token T_GOTO 258 %token T_IF 259 %token T_PACKED 260 %token T_RETURN 261 %token T_SWITCH 262 %token T_SYMBOLRENAME 263 %token T_WHILE 264 %token T_STATIC_ASSERT 265 266 %token T_ATTRIBUTE 267 268 %left T_THEN 269 %left T_ELSE 270 %right T_QUEST T_COLON 271 %left T_LOGOR 272 %left T_LOGAND 273 %left T_BITOR 274 %left T_BITXOR 275 %left T_AMPER 276 %left T_EQUALITY 277 %left T_RELATIONAL 278 %left T_SHIFT 279 %left T_ADDITIVE 280 %left T_ASTERISK T_MULTIPLICATIVE 281 282 %token <y_name> T_NAME 283 %token <y_name> T_TYPENAME 284 %token <y_val> T_CON 285 %token <y_string> T_STRING 286 287 /* No type for program. */ 288 %type <y_sym> identifier_sym 289 %type <y_name> identifier 290 %type <y_string> string 291 %type <y_tnode> primary_expression 292 %type <y_tnode> generic_selection 293 %type <y_generic> generic_assoc_list 294 %type <y_generic> generic_association 295 %type <y_tnode> postfix_expression 296 /* No type for comma_opt. */ 297 %type <y_tnode> gcc_statement_expr_list 298 %type <y_tnode> gcc_statement_expr_item 299 %type <y_op> point_or_arrow 300 %type <y_tnode> argument_expression_list 301 %type <y_tnode> unary_expression 302 %type <y_tnode> cast_expression 303 %type <y_tnode> expression_opt 304 %type <y_tnode> conditional_expression 305 %type <y_tnode> assignment_expression 306 %type <y_tnode> expression 307 %type <y_tnode> constant_expression 308 /* No type for declaration_or_error. */ 309 /* No type for declaration. */ 310 /* No type for begin_type_declaration_specifiers. */ 311 /* No type for begin_type_declmods. */ 312 /* No type for begin_type_specifier_qualifier_list. */ 313 /* No type for begin_type_specifier_qualifier_list_postfix. */ 314 %type <y_type> begin_type_typespec 315 /* No type for begin_type_qualifier_list. */ 316 /* No type for declmod. */ 317 /* No type for type_attribute_list_opt. */ 318 /* No type for type_attribute_list. */ 319 /* No type for type_attribute_opt. */ 320 /* No type for type_attribute. */ 321 /* No type for begin_type. */ 322 /* No type for end_type. */ 323 %type <y_type> type_specifier 324 %type <y_type> notype_type_specifier 325 %type <y_type> atomic_type_specifier 326 %type <y_type> struct_or_union_specifier 327 %type <y_tspec> struct_or_union 328 %type <y_sym> braced_member_declaration_list 329 /* No type for member_declaration_lbrace. */ 330 %type <y_sym> member_declaration_list_with_rbrace 331 %type <y_sym> member_declaration_list 332 %type <y_sym> member_declaration 333 %type <y_sym> notype_member_declarators 334 %type <y_sym> type_member_declarators 335 %type <y_sym> notype_member_declarator 336 %type <y_sym> type_member_declarator 337 %type <y_type> enum_specifier 338 /* No type for enum. */ 339 %type <y_sym> enum_declaration 340 /* No type for enum_decl_lbrace. */ 341 %type <y_sym> enums_with_opt_comma 342 %type <y_sym> enumerator_list 343 %type <y_sym> enumerator 344 %type <y_type_qualifiers> type_qualifier 345 /* No type for atomic. */ 346 %type <y_qual_ptr> pointer 347 %type <y_type_qualifiers> type_qualifier_list_opt 348 %type <y_type_qualifiers> type_qualifier_list 349 /* No type for notype_init_declarators. */ 350 /* No type for type_init_declarators. */ 351 /* No type for notype_init_declarator. */ 352 /* No type for type_init_declarator. */ 353 %type <y_sym> notype_declarator 354 %type <y_sym> type_declarator 355 %type <y_sym> notype_direct_declarator 356 %type <y_sym> type_direct_declarator 357 %type <y_sym> type_param_declarator 358 %type <y_sym> notype_param_declarator 359 %type <y_sym> direct_param_declarator 360 %type <y_sym> direct_notype_param_declarator 361 %type <y_parameter_list> param_list 362 /* No type for id_list_lparen. */ 363 %type <y_array_size> array_size_opt 364 %type <y_tnode> array_size 365 %type <y_sym> identifier_list 366 %type <y_type> type_name 367 %type <y_sym> abstract_declaration 368 %type <y_sym> abstract_declarator 369 %type <y_sym> direct_abstract_declarator 370 %type <y_parameter_list> abstract_decl_param_list 371 /* No type for abstract_decl_lparen. */ 372 %type <y_parameter_list> vararg_parameter_type_list 373 %type <y_parameter_list> parameter_type_list 374 %type <y_sym> parameter_declaration 375 /* No type for braced_initializer. */ 376 /* No type for initializer. */ 377 /* No type for initializer_list. */ 378 /* No type for initializer_list_item. */ 379 /* No type for designation. */ 380 /* No type for begin_designation. */ 381 /* No type for designator_list. */ 382 /* No type for designator. */ 383 /* No type for static_assert_declaration. */ 384 %type <y_range> range 385 /* No type for init_lbrace. */ 386 /* No type for init_rbrace. */ 387 %type <y_name> asm_or_symbolrename_opt 388 /* No type for statement. */ 389 /* No type for no_attr_statement. */ 390 /* No type for non_expr_statement. */ 391 /* No type for no_attr_non_expr_statement. */ 392 /* No type for labeled_statement. */ 393 /* No type for label. */ 394 /* No type for compound_statement. */ 395 /* No type for compound_statement_lbrace. */ 396 /* No type for compound_statement_rbrace. */ 397 %type <y_seen_statement> block_item_list 398 %type <y_seen_statement> block_item 399 /* No type for expression_statement. */ 400 /* No type for selection_statement. */ 401 /* No type for if_without_else. */ 402 /* No type for if_expr. */ 403 /* No type for switch_expr. */ 404 /* No type for iteration_statement. */ 405 /* No type for while_expr. */ 406 /* No type for do_statement. */ 407 /* No type for do. */ 408 %type <y_tnode> do_while_expr 409 /* No type for for_start. */ 410 /* No type for for_exprs. */ 411 /* No type for jump_statement. */ 412 /* No type for goto. */ 413 /* No type for asm_statement. */ 414 /* No type for read_until_rparen. */ 415 /* No type for translation_unit. */ 416 /* No type for external_declaration. */ 417 /* No type for top_level_declaration. */ 418 /* No type for function_definition. */ 419 %type <y_sym> func_declarator 420 /* No type for arg_declaration_list_opt. */ 421 /* No type for arg_declaration_list. */ 422 /* No type for arg_declaration. */ 423 /* No type for gcc_attribute_specifier_list_opt. */ 424 /* No type for gcc_attribute_specifier_list. */ 425 /* No type for gcc_attribute_specifier. */ 426 /* No type for gcc_attribute_list. */ 427 /* No type for gcc_attribute. */ 428 /* No type for gcc_attribute_parameters. */ 429 %type <y_in_system_header> sys 430 431 %% 432 433 program: 434 /* empty */ { 435 /* TODO: Make this an error in C99 mode as well. */ 436 if (!allow_trad && !allow_c99) { 437 /* empty translation unit */ 438 error(272); 439 } else if (allow_c90) { 440 /* empty translation unit */ 441 warning(272); 442 } 443 } 444 | translation_unit 445 ; 446 447 identifier_sym: /* helper for struct/union/enum */ 448 identifier { 449 $$ = getsym($1); 450 } 451 ; 452 453 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 454 identifier: 455 T_NAME { 456 debug_step("cgram: name '%s'", $1->sb_name); 457 $$ = $1; 458 } 459 | T_TYPENAME { 460 debug_step("cgram: typename '%s'", $1->sb_name); 461 $$ = $1; 462 } 463 ; 464 465 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 466 string: 467 T_STRING 468 | string T_STRING { 469 if (!allow_c90) { 470 /* concatenated strings are illegal in traditional C */ 471 warning(219); 472 } 473 $$ = cat_strings($1, $2); 474 } 475 ; 476 477 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 478 primary_expression: 479 T_NAME { 480 bool sys_name, sys_next; 481 sys_name = in_system_header; 482 if (yychar < 0) 483 yychar = yylex(); 484 sys_next = in_system_header; 485 in_system_header = sys_name; 486 $$ = build_name(getsym($1), yychar == T_LPAREN); 487 in_system_header = sys_next; 488 } 489 | T_CON { 490 $$ = build_constant(gettyp($1->v_tspec), $1); 491 } 492 | string { 493 $$ = build_string($1); 494 } 495 | T_LPAREN expression T_RPAREN { 496 if ($2 != NULL) 497 $2->tn_parenthesized = true; 498 $$ = $2; 499 } 500 | generic_selection 501 /* GCC primary-expression, see c_parser_postfix_expression */ 502 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 503 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 504 set_symtyp(FMEMBER); 505 $$ = build_offsetof($3, getsym($5)); 506 } 507 ; 508 509 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 510 generic_selection: 511 T_GENERIC T_LPAREN assignment_expression T_COMMA 512 generic_assoc_list T_RPAREN { 513 /* generic selection requires C11 or later */ 514 c11ism(345); 515 $$ = build_generic_selection($3, $5); 516 } 517 ; 518 519 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 520 generic_assoc_list: 521 generic_association 522 | generic_assoc_list T_COMMA generic_association { 523 $3->ga_prev = $1; 524 $$ = $3; 525 } 526 ; 527 528 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 529 generic_association: 530 type_name T_COLON assignment_expression { 531 $$ = block_zero_alloc(sizeof(*$$), "generic"); 532 $$->ga_arg = $1; 533 $$->ga_result = $3; 534 } 535 | T_DEFAULT T_COLON assignment_expression { 536 $$ = block_zero_alloc(sizeof(*$$), "generic"); 537 $$->ga_arg = NULL; 538 $$->ga_result = $3; 539 } 540 ; 541 542 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 543 postfix_expression: 544 primary_expression 545 | postfix_expression T_LBRACK sys expression T_RBRACK { 546 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 547 } 548 | postfix_expression T_LPAREN sys T_RPAREN { 549 $$ = build_function_call($1, $3, NULL); 550 } 551 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 552 $$ = build_function_call($1, $3, $4); 553 } 554 | postfix_expression point_or_arrow sys T_NAME { 555 $$ = build_member_access($1, $2, $3, $4); 556 } 557 | postfix_expression T_INCDEC sys { 558 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 559 } 560 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 561 sym_t *tmp = mktempsym($2); 562 begin_initialization(tmp); 563 cgram_declare(tmp, true, NULL); 564 } braced_initializer { 565 if (!allow_c99) 566 /* compound literals are a C99/GCC extension */ 567 gnuism(319); 568 $$ = build_name(current_initsym(), false); 569 end_initialization(); 570 } 571 | T_LPAREN compound_statement_lbrace { 572 begin_statement_expr(); 573 } gcc_statement_expr_list { 574 do_statement_expr($4); 575 } compound_statement_rbrace T_RPAREN { 576 $$ = end_statement_expr(); 577 } 578 ; 579 580 comma_opt: /* helper for 'postfix_expression' */ 581 /* empty */ 582 | T_COMMA 583 ; 584 585 /* 586 * The inner part of a GCC statement-expression of the form ({ ... }). 587 * 588 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 589 */ 590 gcc_statement_expr_list: 591 gcc_statement_expr_item 592 | gcc_statement_expr_list gcc_statement_expr_item { 593 $$ = $2; 594 } 595 ; 596 597 gcc_statement_expr_item: 598 declaration_or_error { 599 clear_warning_flags(); 600 $$ = NULL; 601 } 602 | non_expr_statement { 603 $$ = expr_alloc_tnode(); 604 $$->tn_type = gettyp(VOID); 605 } 606 | T_SEMI { 607 $$ = expr_alloc_tnode(); 608 $$->tn_type = gettyp(VOID); 609 } 610 | expression T_SEMI { 611 if ($1 == NULL) { /* in case of syntax errors */ 612 $$ = expr_alloc_tnode(); 613 $$->tn_type = gettyp(VOID); 614 } else { 615 /* XXX: do that only on the last name */ 616 if ($1->tn_op == NAME) 617 $1->tn_sym->s_used = true; 618 expr($1, false, false, false, false); 619 suppress_fallthrough = false; 620 $$ = $1; 621 } 622 } 623 ; 624 625 point_or_arrow: /* helper for 'postfix_expression' */ 626 T_POINT { 627 set_symtyp(FMEMBER); 628 $$ = POINT; 629 } 630 | T_ARROW { 631 set_symtyp(FMEMBER); 632 $$ = ARROW; 633 } 634 ; 635 636 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 637 argument_expression_list: 638 assignment_expression { 639 $$ = build_function_argument(NULL, $1); 640 } 641 | argument_expression_list T_COMMA assignment_expression { 642 $$ = build_function_argument($1, $3); 643 } 644 ; 645 646 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 647 unary_expression: 648 postfix_expression 649 | T_INCDEC sys unary_expression { 650 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 651 } 652 | T_AMPER sys cast_expression { 653 $$ = build_unary(ADDR, $2, $3); 654 } 655 | T_ASTERISK sys cast_expression { 656 $$ = build_unary(INDIR, $2, $3); 657 } 658 | T_ADDITIVE sys cast_expression { 659 if (!allow_c90 && $1 == PLUS) { 660 /* unary '+' is illegal in traditional C */ 661 warning(100); 662 } 663 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 664 } 665 | T_COMPLEMENT sys cast_expression { 666 $$ = build_unary(COMPL, $2, $3); 667 } 668 | T_LOGNOT sys cast_expression { 669 $$ = build_unary(NOT, $2, $3); 670 } 671 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 672 $$ = build_unary(REAL, $2, $3); 673 } 674 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 675 $$ = build_unary(IMAG, $2, $3); 676 } 677 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 678 $$ = $2; 679 } 680 | T_SIZEOF unary_expression { 681 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 682 if ($$ != NULL) 683 check_expr_misc($2, 684 false, false, false, false, false, true); 685 } 686 | T_SIZEOF T_LPAREN type_name T_RPAREN { 687 $$ = build_sizeof($3); 688 } 689 | T_ALIGNOF unary_expression { 690 /* non type argument to alignof is a GCC extension */ 691 gnuism(349); 692 lint_assert($2 != NULL); 693 $$ = build_alignof($2->tn_type); 694 } 695 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 696 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 697 /* TODO: c11ism */ 698 $$ = build_alignof($3); 699 } 700 ; 701 702 /* The rule 'unary_operator' is inlined into unary_expression. */ 703 704 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 705 cast_expression: 706 unary_expression 707 | T_LPAREN type_name T_RPAREN cast_expression { 708 $$ = cast($4, $2); 709 } 710 ; 711 712 expression_opt: 713 /* empty */ { 714 $$ = NULL; 715 } 716 | expression 717 ; 718 719 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 720 /* 'conditional_expression' also implements 'additive_expression'. */ 721 /* 'conditional_expression' also implements 'shift_expression'. */ 722 /* 'conditional_expression' also implements 'relational_expression'. */ 723 /* 'conditional_expression' also implements 'equality_expression'. */ 724 /* 'conditional_expression' also implements 'AND_expression'. */ 725 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 726 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 727 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 728 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 729 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 730 conditional_expression: 731 cast_expression 732 | conditional_expression T_ASTERISK sys conditional_expression { 733 $$ = build_binary($1, MULT, $3, $4); 734 } 735 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 736 $$ = build_binary($1, $2, $3, $4); 737 } 738 | conditional_expression T_ADDITIVE sys conditional_expression { 739 $$ = build_binary($1, $2, $3, $4); 740 } 741 | conditional_expression T_SHIFT sys conditional_expression { 742 $$ = build_binary($1, $2, $3, $4); 743 } 744 | conditional_expression T_RELATIONAL sys conditional_expression { 745 $$ = build_binary($1, $2, $3, $4); 746 } 747 | conditional_expression T_EQUALITY sys conditional_expression { 748 $$ = build_binary($1, $2, $3, $4); 749 } 750 | conditional_expression T_AMPER sys conditional_expression { 751 $$ = build_binary($1, BITAND, $3, $4); 752 } 753 | conditional_expression T_BITXOR sys conditional_expression { 754 $$ = build_binary($1, BITXOR, $3, $4); 755 } 756 | conditional_expression T_BITOR sys conditional_expression { 757 $$ = build_binary($1, BITOR, $3, $4); 758 } 759 | conditional_expression T_LOGAND sys conditional_expression { 760 $$ = build_binary($1, LOGAND, $3, $4); 761 } 762 | conditional_expression T_LOGOR sys conditional_expression { 763 $$ = build_binary($1, LOGOR, $3, $4); 764 } 765 | conditional_expression T_QUEST sys 766 expression T_COLON sys conditional_expression { 767 $$ = build_binary($1, QUEST, $3, 768 build_binary($4, COLON, $6, $7)); 769 } 770 ; 771 772 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 773 assignment_expression: 774 conditional_expression 775 | unary_expression T_ASSIGN sys assignment_expression { 776 $$ = build_binary($1, ASSIGN, $3, $4); 777 } 778 | unary_expression T_OPASSIGN sys assignment_expression { 779 $$ = build_binary($1, $2, $3, $4); 780 } 781 ; 782 783 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 784 expression: 785 assignment_expression 786 | expression T_COMMA sys assignment_expression { 787 $$ = build_binary($1, COMMA, $3, $4); 788 } 789 ; 790 791 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 792 constant_expression: 793 conditional_expression 794 ; 795 796 declaration_or_error: 797 declaration 798 | error T_SEMI 799 ; 800 801 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 802 declaration: 803 begin_type_declmods end_type T_SEMI { 804 if (dcs->d_scl == TYPEDEF) { 805 /* typedef declares no type name */ 806 warning(72); 807 } else { 808 /* empty declaration */ 809 warning(2); 810 } 811 } 812 | begin_type_declmods end_type notype_init_declarators T_SEMI { 813 if (dcs->d_scl == TYPEDEF) { 814 /* syntax error '%s' */ 815 error(249, "missing base type for typedef"); 816 } else { 817 /* old-style declaration; add 'int' */ 818 error(1); 819 } 820 } 821 | begin_type_declaration_specifiers end_type T_SEMI { 822 if (dcs->d_scl == TYPEDEF) { 823 /* typedef declares no type name */ 824 warning(72); 825 } else if (!dcs->d_nonempty_decl) { 826 /* empty declaration */ 827 warning(2); 828 } 829 } 830 | begin_type_declaration_specifiers end_type 831 type_init_declarators T_SEMI 832 | static_assert_declaration 833 ; 834 835 begin_type_declaration_specifiers: /* see C99 6.7 */ 836 begin_type_typespec { 837 dcs_add_type($1); 838 } 839 | begin_type_declmods type_specifier { 840 dcs_add_type($2); 841 } 842 | type_attribute begin_type_declaration_specifiers 843 | begin_type_declaration_specifiers declmod 844 | begin_type_declaration_specifiers notype_type_specifier { 845 dcs_add_type($2); 846 } 847 ; 848 849 begin_type_declmods: /* see C99 6.7 */ 850 begin_type type_qualifier { 851 dcs_add_qualifiers($2); 852 } 853 | begin_type T_SCLASS { 854 dcs_add_storage_class($2); 855 } 856 | begin_type T_FUNCTION_SPECIFIER { 857 dcs_add_function_specifier($2); 858 } 859 | begin_type_declmods declmod 860 ; 861 862 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 863 begin_type_specifier_qualifier_list_postfix 864 | type_attribute_list begin_type_specifier_qualifier_list_postfix 865 ; 866 867 begin_type_specifier_qualifier_list_postfix: 868 begin_type_typespec { 869 dcs_add_type($1); 870 } 871 | begin_type_qualifier_list type_specifier { 872 dcs_add_type($2); 873 } 874 | begin_type_specifier_qualifier_list_postfix type_qualifier { 875 dcs_add_qualifiers($2); 876 } 877 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 878 dcs_add_type($2); 879 } 880 | begin_type_specifier_qualifier_list_postfix type_attribute 881 ; 882 883 begin_type_typespec: 884 begin_type notype_type_specifier { 885 $$ = $2; 886 } 887 | begin_type T_TYPENAME { 888 $$ = getsym($2)->s_type; 889 } 890 ; 891 892 begin_type_qualifier_list: 893 begin_type type_qualifier { 894 dcs_add_qualifiers($2); 895 } 896 | begin_type_qualifier_list type_qualifier { 897 dcs_add_qualifiers($2); 898 } 899 ; 900 901 declmod: 902 type_qualifier { 903 dcs_add_qualifiers($1); 904 } 905 | T_SCLASS { 906 dcs_add_storage_class($1); 907 } 908 | T_FUNCTION_SPECIFIER { 909 dcs_add_function_specifier($1); 910 } 911 | type_attribute_list 912 ; 913 914 type_attribute_list_opt: 915 /* empty */ 916 | type_attribute_list 917 ; 918 919 type_attribute_list: 920 type_attribute 921 | type_attribute_list type_attribute 922 ; 923 924 type_attribute_opt: 925 /* empty */ 926 | type_attribute 927 ; 928 929 type_attribute: /* See C11 6.7 declaration-specifiers */ 930 gcc_attribute_specifier 931 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 932 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 933 | T_PACKED { 934 dcs_add_packed(); 935 } 936 ; 937 938 begin_type: 939 /* empty */ { 940 dcs_begin_type(); 941 } 942 ; 943 944 end_type: 945 /* empty */ { 946 dcs_end_type(); 947 } 948 ; 949 950 type_specifier: /* C99 6.7.2 */ 951 notype_type_specifier 952 | T_TYPENAME { 953 $$ = getsym($1)->s_type; 954 } 955 ; 956 957 notype_type_specifier: /* see C99 6.7.2 */ 958 T_TYPE { 959 $$ = gettyp($1); 960 } 961 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 962 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 963 $$->t_typeof = true; 964 } 965 | atomic_type_specifier 966 | struct_or_union_specifier { 967 end_declaration_level(); 968 $$ = $1; 969 } 970 | enum_specifier { 971 end_declaration_level(); 972 $$ = $1; 973 } 974 ; 975 976 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 977 atomic_type_specifier: 978 atomic T_LPAREN type_name T_RPAREN { 979 $$ = $3; 980 } 981 ; 982 983 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 984 struct_or_union_specifier: 985 struct_or_union identifier_sym { 986 /* 987 * STDC requires that "struct a;" always introduces 988 * a new tag if "a" is not declared at current level 989 * 990 * yychar is valid because otherwise the parser would not 991 * have been able to decide if it must shift or reduce 992 */ 993 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 994 } 995 | struct_or_union identifier_sym { 996 dcs->d_tag_type = make_tag_type($2, $1, true, false); 997 } braced_member_declaration_list { 998 $$ = complete_struct_or_union($4); 999 } 1000 | struct_or_union { 1001 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1002 } braced_member_declaration_list { 1003 $$ = complete_struct_or_union($3); 1004 } 1005 | struct_or_union error { 1006 set_symtyp(FVFT); 1007 $$ = gettyp(INT); 1008 } 1009 ; 1010 1011 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1012 struct_or_union: 1013 T_STRUCT_OR_UNION { 1014 set_symtyp(FTAG); 1015 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1016 dcs->d_sou_size_in_bits = 0; 1017 dcs->d_sou_align_in_bits = CHAR_SIZE; 1018 $$ = $1; 1019 } 1020 | struct_or_union type_attribute 1021 ; 1022 1023 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1024 member_declaration_lbrace member_declaration_list_with_rbrace { 1025 $$ = $2; 1026 } 1027 ; 1028 1029 member_declaration_lbrace: /* see C99 6.7.2.1 */ 1030 T_LBRACE { 1031 set_symtyp(FVFT); 1032 } 1033 ; 1034 1035 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1036 member_declaration_list T_RBRACE 1037 | T_RBRACE { 1038 /* XXX: This is not allowed by any C standard. */ 1039 $$ = NULL; 1040 } 1041 ; 1042 1043 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1044 /* Was named struct_declaration_list until C11. */ 1045 member_declaration_list: 1046 member_declaration 1047 | member_declaration_list member_declaration { 1048 $$ = concat_symbols($1, $2); 1049 } 1050 ; 1051 1052 /* Was named struct_declaration until C11. */ 1053 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1054 member_declaration: 1055 begin_type_qualifier_list end_type { 1056 /* ^^ There is no check for the missing type-specifier. */ 1057 /* too late, i know, but getsym() compensates it */ 1058 set_symtyp(FMEMBER); 1059 } notype_member_declarators T_SEMI { 1060 set_symtyp(FVFT); 1061 $$ = $4; 1062 } 1063 | begin_type_specifier_qualifier_list end_type { 1064 set_symtyp(FMEMBER); 1065 } type_member_declarators T_SEMI { 1066 set_symtyp(FVFT); 1067 $$ = $4; 1068 } 1069 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1070 /* syntax error '%s' */ 1071 error(249, "member without type"); 1072 $$ = NULL; 1073 } 1074 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1075 T_SEMI { 1076 set_symtyp(FVFT); 1077 if (!allow_c11 && !allow_gcc) 1078 /* anonymous struct/union members is a C11 feature */ 1079 warning(49); 1080 if (is_struct_or_union(dcs->d_type->t_tspec)) 1081 $$ = declare_unnamed_member(); 1082 else { 1083 /* syntax error '%s' */ 1084 error(249, "unnamed member"); 1085 $$ = NULL; 1086 } 1087 } 1088 | static_assert_declaration { 1089 $$ = NULL; 1090 } 1091 | error T_SEMI { 1092 set_symtyp(FVFT); 1093 $$ = NULL; 1094 } 1095 ; 1096 1097 /* Was named struct_declarators until C11. */ 1098 notype_member_declarators: 1099 notype_member_declarator { 1100 $$ = declare_member($1); 1101 } 1102 | notype_member_declarators { 1103 set_symtyp(FMEMBER); 1104 } T_COMMA type_member_declarator { 1105 $$ = concat_symbols($1, declare_member($4)); 1106 } 1107 ; 1108 1109 /* Was named struct_declarators until C11. */ 1110 type_member_declarators: 1111 type_member_declarator { 1112 $$ = declare_member($1); 1113 } 1114 | type_member_declarators { 1115 set_symtyp(FMEMBER); 1116 } T_COMMA type_member_declarator { 1117 $$ = concat_symbols($1, declare_member($4)); 1118 } 1119 ; 1120 1121 /* Was named struct_declarator until C11. */ 1122 notype_member_declarator: 1123 notype_declarator 1124 /* C99 6.7.2.1 */ 1125 | notype_declarator T_COLON constant_expression { 1126 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1127 } 1128 /* C99 6.7.2.1 */ 1129 | { 1130 set_symtyp(FVFT); 1131 } T_COLON constant_expression { 1132 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1133 } 1134 ; 1135 1136 /* Was named struct_declarator until C11. */ 1137 type_member_declarator: 1138 type_declarator 1139 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1140 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1141 } 1142 | { 1143 set_symtyp(FVFT); 1144 } T_COLON constant_expression type_attribute_list_opt { 1145 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1146 } 1147 ; 1148 1149 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1150 enum_specifier: 1151 enum gcc_attribute_specifier_list_opt identifier_sym { 1152 $$ = make_tag_type($3, ENUM, false, false); 1153 } 1154 | enum gcc_attribute_specifier_list_opt identifier_sym { 1155 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1156 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1157 $$ = complete_enum($5); 1158 } 1159 | enum gcc_attribute_specifier_list_opt { 1160 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1161 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1162 $$ = complete_enum($4); 1163 } 1164 | enum error { 1165 set_symtyp(FVFT); 1166 $$ = gettyp(INT); 1167 } 1168 ; 1169 1170 enum: /* helper for C99 6.7.2.2 */ 1171 T_ENUM { 1172 set_symtyp(FTAG); 1173 begin_declaration_level(DLK_ENUM); 1174 } 1175 ; 1176 1177 enum_declaration: /* helper for C99 6.7.2.2 */ 1178 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1179 $$ = $2; 1180 } 1181 ; 1182 1183 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1184 T_LBRACE { 1185 set_symtyp(FVFT); 1186 enumval = 0; 1187 } 1188 ; 1189 1190 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1191 enumerator_list 1192 | enumerator_list T_COMMA { 1193 if (!allow_c99 && !allow_trad) { 1194 /* trailing ',' in enum declaration requires C99 ... */ 1195 error(54); 1196 } else { 1197 /* trailing ',' in enum declaration requires C99 ... */ 1198 c99ism(54); 1199 } 1200 $$ = $1; 1201 } 1202 ; 1203 1204 enumerator_list: /* C99 6.7.2.2 */ 1205 enumerator 1206 | enumerator_list T_COMMA enumerator { 1207 $$ = concat_symbols($1, $3); 1208 } 1209 | error { 1210 $$ = NULL; 1211 } 1212 ; 1213 1214 enumerator: /* C99 6.7.2.2 */ 1215 identifier_sym gcc_attribute_specifier_list_opt { 1216 $$ = enumeration_constant($1, enumval, true); 1217 } 1218 | identifier_sym gcc_attribute_specifier_list_opt 1219 T_ASSIGN constant_expression { 1220 $$ = enumeration_constant($1, to_int_constant($4, true), 1221 false); 1222 } 1223 ; 1224 1225 type_qualifier: /* C99 6.7.3 */ 1226 T_QUAL 1227 | atomic { 1228 $$ = (type_qualifiers){ .tq_atomic = true }; 1229 } 1230 ; 1231 1232 atomic: /* helper */ 1233 T_ATOMIC { 1234 /* TODO: First fix c11ism, then use it here. */ 1235 if (!allow_c11) 1236 /* '_Atomic' requires C11 or later */ 1237 error(350); 1238 } 1239 ; 1240 1241 pointer: /* C99 6.7.5 */ 1242 T_ASTERISK type_qualifier_list_opt { 1243 $$ = xcalloc(1, sizeof(*$$)); 1244 add_type_qualifiers(&$$->qualifiers, $2); 1245 } 1246 | T_ASTERISK type_qualifier_list_opt pointer { 1247 $$ = xcalloc(1, sizeof(*$$)); 1248 add_type_qualifiers(&$$->qualifiers, $2); 1249 $$ = append_qualified_pointer($$, $3); 1250 } 1251 ; 1252 1253 type_qualifier_list_opt: /* see C99 6.7.5 */ 1254 /* empty */ { 1255 $$ = (type_qualifiers){ .tq_const = false }; 1256 } 1257 | type_qualifier_list 1258 ; 1259 1260 type_qualifier_list: /* C99 6.7.5 */ 1261 type_qualifier 1262 | type_qualifier_list type_qualifier { 1263 $$ = $1; 1264 add_type_qualifiers(&$$, $2); 1265 } 1266 ; 1267 1268 /* 1269 * For an explanation of 'notype' in the following rules, see 1270 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1271 */ 1272 1273 notype_init_declarators: 1274 notype_init_declarator 1275 | notype_init_declarators T_COMMA type_init_declarator 1276 ; 1277 1278 type_init_declarators: 1279 type_init_declarator 1280 | type_init_declarators T_COMMA type_init_declarator 1281 ; 1282 1283 notype_init_declarator: 1284 notype_declarator asm_or_symbolrename_opt { 1285 cgram_declare($1, false, $2); 1286 check_size($1); 1287 } 1288 | notype_declarator asm_or_symbolrename_opt { 1289 begin_initialization($1); 1290 cgram_declare($1, true, $2); 1291 } T_ASSIGN initializer { 1292 check_size($1); 1293 end_initialization(); 1294 } 1295 ; 1296 1297 type_init_declarator: 1298 type_declarator asm_or_symbolrename_opt { 1299 cgram_declare($1, false, $2); 1300 check_size($1); 1301 } 1302 | type_declarator asm_or_symbolrename_opt { 1303 begin_initialization($1); 1304 cgram_declare($1, true, $2); 1305 } T_ASSIGN initializer { 1306 check_size($1); 1307 end_initialization(); 1308 } 1309 ; 1310 1311 notype_declarator: 1312 notype_direct_declarator 1313 | pointer notype_direct_declarator { 1314 $$ = add_pointer($2, $1); 1315 } 1316 ; 1317 1318 type_declarator: 1319 type_direct_declarator 1320 | pointer type_direct_declarator { 1321 $$ = add_pointer($2, $1); 1322 } 1323 ; 1324 1325 notype_direct_declarator: 1326 type_attribute_list_opt T_NAME { 1327 $$ = declarator_name(getsym($2)); 1328 } 1329 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1330 $$ = $3; 1331 } 1332 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1333 $$ = add_array($1, $3.has_dim, $3.dim); 1334 } 1335 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1336 $$ = add_function(symbolrename($1, $3), $2); 1337 end_declaration_level(); 1338 block_level--; 1339 } 1340 | notype_direct_declarator type_attribute 1341 ; 1342 1343 type_direct_declarator: 1344 type_attribute_list_opt identifier { 1345 $$ = declarator_name(getsym($2)); 1346 } 1347 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1348 $$ = $3; 1349 } 1350 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1351 $$ = add_array($1, $3.has_dim, $3.dim); 1352 } 1353 | type_direct_declarator param_list asm_or_symbolrename_opt { 1354 $$ = add_function(symbolrename($1, $3), $2); 1355 end_declaration_level(); 1356 block_level--; 1357 } 1358 | type_direct_declarator type_attribute 1359 ; 1360 1361 /* 1362 * The two distinct rules type_param_declarator and notype_param_declarator 1363 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1364 * always treated as a typename, not an argument name. For example, after 1365 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1366 * "f(int (double));", not "f(int a);". 1367 */ 1368 type_param_declarator: 1369 direct_param_declarator 1370 | pointer direct_param_declarator { 1371 $$ = add_pointer($2, $1); 1372 } 1373 ; 1374 1375 notype_param_declarator: 1376 direct_notype_param_declarator 1377 | pointer direct_notype_param_declarator { 1378 $$ = add_pointer($2, $1); 1379 } 1380 ; 1381 1382 direct_param_declarator: 1383 identifier type_attribute_list { 1384 $$ = declarator_name(getsym($1)); 1385 } 1386 | identifier { 1387 $$ = declarator_name(getsym($1)); 1388 } 1389 | T_LPAREN notype_param_declarator T_RPAREN { 1390 $$ = $2; 1391 } 1392 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1393 gcc_attribute_specifier_list_opt { 1394 $$ = add_array($1, $3.has_dim, $3.dim); 1395 } 1396 | direct_param_declarator param_list asm_or_symbolrename_opt { 1397 $$ = add_function(symbolrename($1, $3), $2); 1398 end_declaration_level(); 1399 block_level--; 1400 } 1401 ; 1402 1403 direct_notype_param_declarator: 1404 identifier { 1405 $$ = declarator_name(getsym($1)); 1406 } 1407 | T_LPAREN notype_param_declarator T_RPAREN { 1408 $$ = $2; 1409 } 1410 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1411 $$ = add_array($1, $3.has_dim, $3.dim); 1412 } 1413 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1414 $$ = add_function(symbolrename($1, $3), $2); 1415 end_declaration_level(); 1416 block_level--; 1417 } 1418 ; 1419 1420 param_list: 1421 id_list_lparen identifier_list T_RPAREN { 1422 $$ = (struct parameter_list){ .first = $2 }; 1423 } 1424 | abstract_decl_param_list 1425 ; 1426 1427 id_list_lparen: 1428 T_LPAREN { 1429 block_level++; 1430 begin_declaration_level(DLK_PROTO_PARAMS); 1431 } 1432 ; 1433 1434 array_size_opt: 1435 /* empty */ { 1436 $$.has_dim = false; 1437 $$.dim = 0; 1438 } 1439 | T_ASTERISK { 1440 /* since C99; variable length array of unspecified size */ 1441 $$.has_dim = false; /* TODO: maybe change to true */ 1442 $$.dim = 0; /* just as a placeholder */ 1443 } 1444 | array_size { 1445 $$.has_dim = true; 1446 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1447 } 1448 ; 1449 1450 array_size: 1451 type_qualifier_list_opt T_SCLASS constant_expression { 1452 /* C11 6.7.6.3p7 */ 1453 if ($2 != STATIC) 1454 yyerror("Bad attribute"); 1455 /* static array size requires C11 or later */ 1456 c11ism(343); 1457 $$ = $3; 1458 } 1459 | type_qualifier { 1460 /* C11 6.7.6.2 */ 1461 if (!$1.tq_restrict) 1462 yyerror("Bad attribute"); 1463 $$ = NULL; 1464 } 1465 | constant_expression 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 begin_designation designator_list T_ASSIGN 1666 | identifier T_COLON { 1667 /* GCC style struct or union member name in initializer */ 1668 gnuism(315); 1669 begin_designation(); 1670 add_designator_member($1); 1671 } 1672 ; 1673 1674 begin_designation: /* lint-specific helper */ 1675 /* empty */ { 1676 begin_designation(); 1677 } 1678 ; 1679 1680 designator_list: /* C99 6.7.8 "Initialization" */ 1681 designator 1682 | designator_list designator 1683 ; 1684 1685 designator: /* C99 6.7.8 "Initialization" */ 1686 T_LBRACK range T_RBRACK { 1687 if (!allow_c99) 1688 /* array initializer with designators is a C99 ... */ 1689 warning(321); 1690 add_designator_subscript($2); 1691 } 1692 | T_POINT identifier { 1693 if (!allow_c99) 1694 /* struct or union member name in initializer is ... */ 1695 warning(313); 1696 add_designator_member($2); 1697 } 1698 ; 1699 1700 static_assert_declaration: 1701 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1702 T_RPAREN T_SEMI { 1703 /* '_Static_assert' requires C11 or later */ 1704 c11ism(354); 1705 } 1706 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1707 /* '_Static_assert' without message requires C23 or later */ 1708 c23ism(355); 1709 } 1710 ; 1711 1712 range: 1713 constant_expression { 1714 $$.lo = to_int_constant($1, true); 1715 $$.hi = $$.lo; 1716 } 1717 | constant_expression T_ELLIPSIS constant_expression { 1718 $$.lo = to_int_constant($1, true); 1719 $$.hi = to_int_constant($3, true); 1720 /* initialization with '[a...b]' is a GCC extension */ 1721 gnuism(340); 1722 } 1723 ; 1724 1725 init_lbrace: /* helper */ 1726 T_LBRACE { 1727 init_lbrace(); 1728 } 1729 ; 1730 1731 init_rbrace: /* helper */ 1732 T_RBRACE { 1733 init_rbrace(); 1734 } 1735 ; 1736 1737 asm_or_symbolrename_opt: /* GCC extensions */ 1738 /* empty */ { 1739 $$ = NULL; 1740 } 1741 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1742 freeyyv(&$3, T_STRING); 1743 $$ = NULL; 1744 } 1745 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1746 gcc_attribute_specifier_list_opt { 1747 $$ = $3; 1748 } 1749 ; 1750 1751 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1752 statement: 1753 expression_statement 1754 | non_expr_statement 1755 ; 1756 1757 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1758 no_attr_statement: 1759 expression_statement 1760 | no_attr_non_expr_statement 1761 ; 1762 1763 non_expr_statement: /* helper for C99 6.8 */ 1764 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1765 | no_attr_non_expr_statement 1766 ; 1767 1768 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1769 no_attr_non_expr_statement: 1770 labeled_statement 1771 | compound_statement 1772 | selection_statement 1773 | iteration_statement 1774 | jump_statement { 1775 suppress_fallthrough = false; 1776 } 1777 | asm_statement 1778 ; 1779 1780 labeled_statement: /* C99 6.8.1 */ 1781 label gcc_attribute_specifier_list_opt no_attr_statement 1782 ; 1783 1784 label: 1785 T_NAME T_COLON { 1786 set_symtyp(FLABEL); 1787 named_label(getsym($1)); 1788 } 1789 | T_CASE constant_expression T_COLON { 1790 case_label($2); 1791 suppress_fallthrough = true; 1792 } 1793 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1794 /* XXX: We don't fill all cases */ 1795 case_label($2); 1796 suppress_fallthrough = true; 1797 } 1798 | T_DEFAULT T_COLON { 1799 default_label(); 1800 suppress_fallthrough = true; 1801 } 1802 ; 1803 1804 compound_statement: /* C99 6.8.2 */ 1805 compound_statement_lbrace compound_statement_rbrace 1806 | compound_statement_lbrace block_item_list compound_statement_rbrace 1807 ; 1808 1809 compound_statement_lbrace: 1810 T_LBRACE { 1811 block_level++; 1812 mem_block_level++; 1813 debug_step("%s: mem_block_level = %zu", 1814 "compound_statement_lbrace", mem_block_level); 1815 begin_declaration_level(DLK_AUTO); 1816 } 1817 ; 1818 1819 compound_statement_rbrace: 1820 T_RBRACE { 1821 end_declaration_level(); 1822 if (!in_statement_expr()) 1823 level_free_all(mem_block_level); /* leak */ 1824 mem_block_level--; 1825 debug_step("%s: mem_block_level = %zu", 1826 "compound_statement_rbrace", mem_block_level); 1827 block_level--; 1828 suppress_fallthrough = false; 1829 } 1830 ; 1831 1832 block_item_list: /* C99 6.8.2 */ 1833 block_item 1834 | block_item_list block_item { 1835 if ($1 && !$2) 1836 /* declarations after statements is a C99 feature */ 1837 c99ism(327); 1838 $$ = $1 || $2; 1839 } 1840 ; 1841 1842 block_item: /* C99 6.8.2 */ 1843 declaration_or_error { 1844 $$ = false; 1845 restore_warning_flags(); 1846 } 1847 | statement { 1848 $$ = true; 1849 restore_warning_flags(); 1850 } 1851 ; 1852 1853 expression_statement: /* C99 6.8.3 */ 1854 expression T_SEMI { 1855 expr($1, false, false, false, false); 1856 suppress_fallthrough = false; 1857 } 1858 | T_SEMI { 1859 check_statement_reachable(); 1860 suppress_fallthrough = false; 1861 } 1862 ; 1863 1864 selection_statement: /* C99 6.8.4 */ 1865 if_without_else %prec T_THEN { 1866 save_warning_flags(); 1867 stmt_if_then_stmt(); 1868 stmt_if_else_stmt(false); 1869 } 1870 | if_without_else T_ELSE { 1871 save_warning_flags(); 1872 stmt_if_then_stmt(); 1873 } statement { 1874 clear_warning_flags(); 1875 stmt_if_else_stmt(true); 1876 } 1877 | if_without_else T_ELSE error { 1878 clear_warning_flags(); 1879 stmt_if_else_stmt(false); 1880 } 1881 | switch_expr statement { 1882 clear_warning_flags(); 1883 stmt_switch_expr_stmt(); 1884 } 1885 | switch_expr error { 1886 clear_warning_flags(); 1887 stmt_switch_expr_stmt(); 1888 } 1889 ; 1890 1891 if_without_else: /* see C99 6.8.4 */ 1892 if_expr statement 1893 | if_expr error 1894 ; 1895 1896 if_expr: /* see C99 6.8.4 */ 1897 T_IF T_LPAREN expression T_RPAREN { 1898 stmt_if_expr($3); 1899 clear_warning_flags(); 1900 } 1901 ; 1902 1903 switch_expr: /* see C99 6.8.4 */ 1904 T_SWITCH T_LPAREN expression T_RPAREN { 1905 stmt_switch_expr($3); 1906 clear_warning_flags(); 1907 } 1908 ; 1909 1910 iteration_statement: /* C99 6.8.5 */ 1911 while_expr statement { 1912 clear_warning_flags(); 1913 stmt_while_expr_stmt(); 1914 } 1915 | while_expr error { 1916 clear_warning_flags(); 1917 stmt_while_expr_stmt(); 1918 } 1919 | do_statement do_while_expr { 1920 stmt_do_while_expr($2); 1921 suppress_fallthrough = false; 1922 } 1923 | do error { 1924 clear_warning_flags(); 1925 stmt_do_while_expr(NULL); 1926 } 1927 | for_exprs statement { 1928 clear_warning_flags(); 1929 stmt_for_exprs_stmt(); 1930 end_declaration_level(); 1931 block_level--; 1932 } 1933 | for_exprs error { 1934 clear_warning_flags(); 1935 stmt_for_exprs_stmt(); 1936 end_declaration_level(); 1937 block_level--; 1938 } 1939 ; 1940 1941 while_expr: /* see C99 6.8.5 */ 1942 T_WHILE T_LPAREN expression T_RPAREN { 1943 stmt_while_expr($3); 1944 clear_warning_flags(); 1945 } 1946 ; 1947 1948 do_statement: /* see C99 6.8.5 */ 1949 do statement { 1950 clear_warning_flags(); 1951 } 1952 ; 1953 1954 do: /* see C99 6.8.5 */ 1955 T_DO { 1956 stmt_do(); 1957 } 1958 ; 1959 1960 do_while_expr: /* see C99 6.8.5 */ 1961 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1962 $$ = $3; 1963 } 1964 ; 1965 1966 for_start: /* see C99 6.8.5 */ 1967 T_FOR T_LPAREN { 1968 begin_declaration_level(DLK_AUTO); 1969 block_level++; 1970 } 1971 ; 1972 1973 for_exprs: /* see C99 6.8.5 */ 1974 for_start 1975 begin_type_declaration_specifiers end_type 1976 notype_init_declarators T_SEMI 1977 expression_opt T_SEMI 1978 expression_opt T_RPAREN { 1979 /* variable declaration in for loop */ 1980 c99ism(325); 1981 stmt_for_exprs(NULL, $6, $8); 1982 clear_warning_flags(); 1983 } 1984 | for_start 1985 expression_opt T_SEMI 1986 expression_opt T_SEMI 1987 expression_opt T_RPAREN { 1988 stmt_for_exprs($2, $4, $6); 1989 clear_warning_flags(); 1990 } 1991 ; 1992 1993 jump_statement: /* C99 6.8.6 */ 1994 goto identifier T_SEMI { 1995 stmt_goto(getsym($2)); 1996 } 1997 | goto error T_SEMI { 1998 set_symtyp(FVFT); 1999 } 2000 | T_CONTINUE T_SEMI { 2001 stmt_continue(); 2002 } 2003 | T_BREAK T_SEMI { 2004 stmt_break(); 2005 } 2006 | T_RETURN sys T_SEMI { 2007 stmt_return($2, NULL); 2008 } 2009 | T_RETURN sys expression T_SEMI { 2010 stmt_return($2, $3); 2011 } 2012 ; 2013 2014 goto: /* see C99 6.8.6 */ 2015 T_GOTO { 2016 set_symtyp(FLABEL); 2017 } 2018 ; 2019 2020 asm_statement: /* GCC extension */ 2021 T_ASM T_LPAREN read_until_rparen T_SEMI { 2022 dcs_set_asm(); 2023 } 2024 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2025 dcs_set_asm(); 2026 } 2027 | T_ASM error 2028 ; 2029 2030 read_until_rparen: /* helper for 'asm_statement' */ 2031 /* empty */ { 2032 read_until_rparen(); 2033 } 2034 ; 2035 2036 translation_unit: /* C99 6.9 */ 2037 external_declaration 2038 | translation_unit external_declaration 2039 ; 2040 2041 external_declaration: /* C99 6.9 */ 2042 function_definition { 2043 global_clean_up_decl(false); 2044 clear_warning_flags(); 2045 } 2046 | top_level_declaration { 2047 global_clean_up_decl(false); 2048 clear_warning_flags(); 2049 } 2050 | asm_statement /* GCC extension */ 2051 | T_SEMI { /* GCC extension */ 2052 /* 2053 * TODO: Only allow this in GCC mode, not in plain C99. 2054 * This is one of the top 10 warnings in the NetBSD build. 2055 */ 2056 if (!allow_trad && !allow_c99) { 2057 /* empty declaration */ 2058 error(0); 2059 } else if (allow_c90) { 2060 /* empty declaration */ 2061 warning(0); 2062 } 2063 } 2064 ; 2065 2066 /* 2067 * On the top level, lint allows several forms of declarations that it doesn't 2068 * allow in functions. For example, a single ';' is an empty declaration and 2069 * is supported by some compilers, but in a function it would be an empty 2070 * statement, not a declaration. This makes a difference in C90 mode, where 2071 * a statement must not be followed by a declaration. 2072 * 2073 * See 'declaration' for all other declarations. 2074 */ 2075 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2076 begin_type end_type notype_init_declarators T_SEMI { 2077 /* TODO: Make this an error in C99 mode as well. */ 2078 if (!allow_trad && !allow_c99) { 2079 /* old-style declaration; add 'int' */ 2080 error(1); 2081 } else if (allow_c90) { 2082 /* old-style declaration; add 'int' */ 2083 warning(1); 2084 } 2085 } 2086 | declaration 2087 | error T_SEMI { 2088 global_clean_up(); 2089 } 2090 | error T_RBRACE { 2091 global_clean_up(); 2092 } 2093 ; 2094 2095 function_definition: /* C99 6.9.1 */ 2096 func_declarator { 2097 if ($1->s_type->t_tspec != FUNC) { 2098 /* syntax error '%s' */ 2099 error(249, yytext); 2100 YYERROR; 2101 } 2102 if ($1->s_type->t_typedef) { 2103 /* ()-less function definition */ 2104 error(64); 2105 YYERROR; 2106 } 2107 check_extern_declaration($1); 2108 begin_function($1); 2109 block_level++; 2110 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2111 if (lwarn == LWARN_NONE) 2112 $1->s_used = true; 2113 } arg_declaration_list_opt { 2114 end_declaration_level(); 2115 block_level--; 2116 check_func_lint_directives(); 2117 check_func_old_style_parameters(); 2118 begin_control_statement(CS_FUNCTION_BODY); 2119 } compound_statement { 2120 end_function(); 2121 end_control_statement(CS_FUNCTION_BODY); 2122 } 2123 ; 2124 2125 func_declarator: 2126 begin_type end_type notype_declarator { 2127 if (!allow_trad) { 2128 /* old-style declaration; add 'int' */ 2129 error(1); 2130 } 2131 $$ = $3; 2132 } 2133 | begin_type_declmods end_type notype_declarator { 2134 if (!allow_trad) { 2135 /* old-style declaration; add 'int' */ 2136 error(1); 2137 } 2138 $$ = $3; 2139 } 2140 | begin_type_declaration_specifiers end_type type_declarator { 2141 $$ = $3; 2142 } 2143 ; 2144 2145 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2146 /* empty */ 2147 | arg_declaration_list 2148 ; 2149 2150 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2151 arg_declaration 2152 | arg_declaration_list arg_declaration 2153 /* XXX or better "arg_declaration error" ? */ 2154 | error 2155 ; 2156 2157 /* 2158 * "arg_declaration" is separated from "declaration" because it 2159 * needs other error handling. 2160 */ 2161 arg_declaration: 2162 begin_type_declmods end_type T_SEMI { 2163 /* empty declaration */ 2164 warning(2); 2165 } 2166 | begin_type_declmods end_type notype_init_declarators T_SEMI 2167 | begin_type_declaration_specifiers end_type T_SEMI { 2168 if (!dcs->d_nonempty_decl) { 2169 /* empty declaration */ 2170 warning(2); 2171 } else { 2172 /* '%s' declared in parameter declaration list */ 2173 warning(3, type_name(dcs->d_type)); 2174 } 2175 } 2176 | begin_type_declaration_specifiers end_type 2177 type_init_declarators T_SEMI { 2178 if (dcs->d_nonempty_decl) { 2179 /* '%s' declared in parameter declaration list */ 2180 warning(3, type_name(dcs->d_type)); 2181 } 2182 } 2183 | begin_type_declmods error 2184 | begin_type_declaration_specifiers error 2185 ; 2186 2187 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2188 gcc_attribute_specifier_list_opt: 2189 /* empty */ 2190 | gcc_attribute_specifier_list 2191 ; 2192 2193 gcc_attribute_specifier_list: 2194 gcc_attribute_specifier 2195 | gcc_attribute_specifier_list gcc_attribute_specifier 2196 ; 2197 2198 gcc_attribute_specifier: 2199 T_ATTRIBUTE T_LPAREN T_LPAREN { 2200 in_gcc_attribute = true; 2201 } gcc_attribute_list { 2202 in_gcc_attribute = false; 2203 } T_RPAREN T_RPAREN 2204 ; 2205 2206 gcc_attribute_list: 2207 gcc_attribute 2208 | gcc_attribute_list T_COMMA gcc_attribute 2209 ; 2210 2211 gcc_attribute: 2212 /* empty */ 2213 | T_NAME { 2214 const char *name = $1->sb_name; 2215 if (is_either(name, "packed", "__packed__")) 2216 dcs_add_packed(); 2217 else if (is_either(name, "used", "__used__") || 2218 is_either(name, "unused", "__unused__")) 2219 dcs_set_used(); 2220 else if (is_either(name, "fallthrough", "__fallthrough__")) 2221 suppress_fallthrough = true; 2222 } 2223 | T_NAME T_LPAREN T_RPAREN 2224 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2225 | type_qualifier { 2226 if (!$1.tq_const) 2227 yyerror("Bad attribute"); 2228 } 2229 ; 2230 2231 gcc_attribute_parameters: 2232 constant_expression 2233 | gcc_attribute_parameters T_COMMA constant_expression 2234 ; 2235 2236 sys: 2237 /* empty */ { 2238 $$ = in_system_header; 2239 } 2240 ; 2241 2242 %% 2243 2244 /* ARGSUSED */ 2245 int 2246 yyerror(const char *msg) 2247 { 2248 /* syntax error '%s' */ 2249 error(249, yytext); 2250 if (++sytxerr >= 5) 2251 norecover(); 2252 return 0; 2253 } 2254 2255 #if YYDEBUG && YYBYACC 2256 static const char * 2257 cgram_to_string(int token, YYSTYPE val) 2258 { 2259 2260 switch (token) { 2261 case T_INCDEC: 2262 return val.y_inc ? "++" : "--"; 2263 case T_MULTIPLICATIVE: 2264 case T_ADDITIVE: 2265 case T_SHIFT: 2266 case T_RELATIONAL: 2267 case T_EQUALITY: 2268 case T_OPASSIGN: 2269 return op_name(val.y_op); 2270 case T_SCLASS: 2271 return scl_name(val.y_scl); 2272 case T_TYPE: 2273 case T_STRUCT_OR_UNION: 2274 return tspec_name(val.y_tspec); 2275 case T_QUAL: 2276 return type_qualifiers_string(val.y_type_qualifiers); 2277 case T_FUNCTION_SPECIFIER: 2278 return function_specifier_name(val.y_function_specifier); 2279 case T_NAME: 2280 return val.y_name->sb_name; 2281 default: 2282 return "<none>"; 2283 } 2284 } 2285 #endif 2286 2287 static void 2288 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2289 { 2290 declare(decl, has_initializer, renaming); 2291 if (renaming != NULL) 2292 freeyyv(&renaming, T_NAME); 2293 } 2294 2295 /* 2296 * Discard all input tokens up to and including the next unmatched right 2297 * parenthesis. 2298 */ 2299 static void 2300 read_until_rparen(void) 2301 { 2302 int level; 2303 2304 if (yychar < 0) 2305 yychar = yylex(); 2306 freeyyv(&yylval, yychar); 2307 2308 level = 1; 2309 while (yychar > 0) { 2310 if (yychar == T_LPAREN) 2311 level++; 2312 if (yychar == T_RPAREN && --level == 0) 2313 break; 2314 freeyyv(&yylval, yychar = yylex()); 2315 } 2316 2317 yyclearin; 2318 } 2319 2320 static sym_t * 2321 symbolrename(sym_t *s, sbuf_t *sb) 2322 { 2323 if (sb != NULL) 2324 s->s_rename = sb->sb_name; 2325 return s; 2326 } 2327
Indexes created Fri Oct 03 02:09:57 GMT 2025