cgram.y revision 1.472
1 %{ 2 /* $NetBSD: cgram.y,v 1.472 2023/08/26 10:43:53 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 1.472 2023/08/26 10:43:53 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 104 136 137 %union { 138 val_t *y_val; 139 sbuf_t *y_name; 140 sym_t *y_sym; 141 op_t y_op; 142 scl_t y_scl; 143 tspec_t y_tspec; 144 type_qualifiers y_type_qualifiers; 145 function_specifier y_function_specifier; 146 struct parameter_list y_parameter_list; 147 type_t *y_type; 148 tnode_t *y_tnode; 149 range_t y_range; 150 strg_t *y_string; 151 qual_ptr *y_qual_ptr; 152 bool y_seen_statement; 153 struct generic_association *y_generic; 154 struct array_size y_array_size; 155 bool y_in_system_header; 156 }; 157 158 /* for Bison: 159 %printer { 160 if (is_integer($$->v_tspec)) 161 fprintf(yyo, "%lld", (unsigned long long)$$->u.integer); 162 else 163 fprintf(yyo, "%Lg", $$->u.floating); 164 } <y_val> 165 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 166 %printer { 167 bool indented = debug_push_indented(true); 168 debug_sym("", $$, ""); 169 debug_pop_indented(indented); 170 } <y_sym> 171 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 172 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 173 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 174 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 175 %printer { 176 fprintf(yyo, "%s", function_specifier_name($$)); 177 } <y_function_specifier> 178 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 179 %printer { 180 if ($$ == NULL) 181 fprintf(yyo, "<null>"); 182 else 183 fprintf(yyo, "%s '%s'", 184 op_name($$->tn_op), type_name($$->tn_type)); 185 } <y_tnode> 186 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 187 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 188 %printer { 189 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 190 } <y_qual_ptr> 191 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 192 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 193 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 194 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 195 */ 196 197 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 198 %token T_POINT T_ARROW 199 %token T_COMPLEMENT T_LOGNOT 200 %token <y_op> T_INCDEC 201 %token T_SIZEOF 202 %token T_BUILTIN_OFFSETOF 203 %token T_TYPEOF 204 %token T_EXTENSION 205 %token T_ALIGNAS 206 %token T_ALIGNOF 207 %token T_ASTERISK 208 %token <y_op> T_MULTIPLICATIVE 209 %token <y_op> T_ADDITIVE 210 %token <y_op> T_SHIFT 211 %token <y_op> T_RELATIONAL 212 %token <y_op> T_EQUALITY 213 %token T_AMPER 214 %token T_BITXOR 215 %token T_BITOR 216 %token T_LOGAND 217 %token T_LOGOR 218 %token T_QUEST 219 %token T_COLON 220 %token T_ASSIGN 221 %token <y_op> T_OPASSIGN 222 %token T_COMMA 223 %token T_SEMI 224 %token T_ELLIPSIS 225 %token T_REAL 226 %token T_IMAG 227 %token T_GENERIC 228 229 /* storage classes (extern, static, auto, register and typedef) */ 230 %token <y_scl> T_SCLASS 231 %token <y_function_specifier> T_FUNCTION_SPECIFIER 232 233 /* 234 * predefined type keywords (char, int, short, long, unsigned, signed, 235 * float, double, void); see T_TYPENAME for types from typedef 236 */ 237 %token <y_tspec> T_TYPE 238 239 %token <y_type_qualifiers> T_QUAL 240 %token <y_type_qualifiers> T_ATOMIC 241 242 /* struct or union */ 243 %token <y_tspec> T_STRUCT_OR_UNION 244 245 /* remaining keywords */ 246 %token T_ASM 247 %token T_BREAK 248 %token T_CASE 249 %token T_CONTINUE 250 %token T_DEFAULT 251 %token T_DO 252 %token T_ELSE 253 %token T_ENUM 254 %token T_FOR 255 %token T_GOTO 256 %token T_IF 257 %token T_PACKED 258 %token T_RETURN 259 %token T_SWITCH 260 %token T_SYMBOLRENAME 261 %token T_WHILE 262 %token T_STATIC_ASSERT 263 264 %token T_ATTRIBUTE 265 266 %left T_THEN 267 %left T_ELSE 268 %right T_QUEST T_COLON 269 %left T_LOGOR 270 %left T_LOGAND 271 %left T_BITOR 272 %left T_BITXOR 273 %left T_AMPER 274 %left T_EQUALITY 275 %left T_RELATIONAL 276 %left T_SHIFT 277 %left T_ADDITIVE 278 %left T_ASTERISK T_MULTIPLICATIVE 279 280 %token <y_name> T_NAME 281 %token <y_name> T_TYPENAME 282 %token <y_val> T_CON 283 %token <y_string> T_STRING 284 285 /* No type for program. */ 286 %type <y_sym> identifier_sym 287 %type <y_name> identifier 288 %type <y_string> string 289 %type <y_tnode> primary_expression 290 %type <y_tnode> generic_selection 291 %type <y_generic> generic_assoc_list 292 %type <y_generic> generic_association 293 %type <y_tnode> postfix_expression 294 /* No type for comma_opt. */ 295 %type <y_tnode> gcc_statement_expr_list 296 %type <y_tnode> gcc_statement_expr_item 297 %type <y_op> point_or_arrow 298 %type <y_tnode> argument_expression_list 299 %type <y_tnode> unary_expression 300 %type <y_tnode> cast_expression 301 %type <y_tnode> expression_opt 302 %type <y_tnode> conditional_expression 303 %type <y_tnode> assignment_expression 304 %type <y_tnode> expression 305 %type <y_tnode> constant_expression 306 /* No type for declaration_or_error. */ 307 /* No type for declaration. */ 308 /* No type for begin_type_declaration_specifiers. */ 309 /* No type for begin_type_declmods. */ 310 /* No type for begin_type_specifier_qualifier_list. */ 311 /* No type for begin_type_specifier_qualifier_list_postfix. */ 312 %type <y_type> begin_type_typespec 313 /* No type for begin_type_qualifier_list. */ 314 /* No type for declmod. */ 315 /* No type for type_attribute_list_opt. */ 316 /* No type for type_attribute_list. */ 317 /* No type for type_attribute_opt. */ 318 /* No type for type_attribute. */ 319 /* No type for begin_type. */ 320 /* No type for end_type. */ 321 %type <y_type> type_specifier 322 %type <y_type> notype_type_specifier 323 %type <y_type> atomic_type_specifier 324 %type <y_type> struct_or_union_specifier 325 %type <y_tspec> struct_or_union 326 %type <y_sym> braced_member_declaration_list 327 /* No type for member_declaration_lbrace. */ 328 %type <y_sym> member_declaration_list_with_rbrace 329 %type <y_sym> member_declaration_list 330 %type <y_sym> member_declaration 331 %type <y_sym> notype_member_declarators 332 %type <y_sym> type_member_declarators 333 %type <y_sym> notype_member_declarator 334 %type <y_sym> type_member_declarator 335 %type <y_type> enum_specifier 336 /* No type for enum. */ 337 %type <y_sym> enum_declaration 338 /* No type for enum_decl_lbrace. */ 339 %type <y_sym> enums_with_opt_comma 340 %type <y_sym> enumerator_list 341 %type <y_sym> enumerator 342 %type <y_type_qualifiers> type_qualifier 343 /* No type for atomic. */ 344 %type <y_qual_ptr> pointer 345 %type <y_type_qualifiers> type_qualifier_list_opt 346 %type <y_type_qualifiers> type_qualifier_list 347 /* No type for notype_init_declarators. */ 348 /* No type for type_init_declarators. */ 349 /* No type for notype_init_declarator. */ 350 /* No type for type_init_declarator. */ 351 %type <y_sym> notype_declarator 352 %type <y_sym> type_declarator 353 %type <y_sym> notype_direct_declarator 354 %type <y_sym> type_direct_declarator 355 %type <y_sym> type_param_declarator 356 %type <y_sym> notype_param_declarator 357 %type <y_sym> direct_param_declarator 358 %type <y_sym> direct_notype_param_declarator 359 %type <y_parameter_list> param_list 360 /* No type for id_list_lparen. */ 361 %type <y_array_size> array_size_opt 362 %type <y_tnode> array_size 363 %type <y_sym> identifier_list 364 %type <y_type> type_name 365 %type <y_sym> abstract_declaration 366 %type <y_sym> abstract_declarator 367 %type <y_sym> direct_abstract_declarator 368 %type <y_parameter_list> abstract_decl_param_list 369 /* No type for abstract_decl_lparen. */ 370 %type <y_parameter_list> vararg_parameter_type_list 371 %type <y_parameter_list> parameter_type_list 372 %type <y_sym> parameter_declaration 373 /* No type for braced_initializer. */ 374 /* No type for initializer. */ 375 /* No type for initializer_list. */ 376 /* No type for initializer_list_item. */ 377 /* No type for designation. */ 378 /* No type for begin_designation. */ 379 /* No type for designator_list. */ 380 /* No type for designator. */ 381 /* No type for static_assert_declaration. */ 382 %type <y_range> range 383 /* No type for init_lbrace. */ 384 /* No type for init_rbrace. */ 385 %type <y_name> asm_or_symbolrename_opt 386 /* No type for statement. */ 387 /* No type for 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 %type <y_tnode> do_while_expr 405 /* No type for for_start. */ 406 /* No type for for_exprs. */ 407 /* No type for jump_statement. */ 408 /* No type for goto. */ 409 /* No type for asm_statement. */ 410 /* No type for read_until_rparen. */ 411 /* No type for translation_unit. */ 412 /* No type for external_declaration. */ 413 /* No type for top_level_declaration. */ 414 /* No type for function_definition. */ 415 %type <y_sym> func_declarator 416 /* No type for arg_declaration_list_opt. */ 417 /* No type for arg_declaration_list. */ 418 /* No type for arg_declaration. */ 419 /* No type for gcc_attribute_specifier_list_opt. */ 420 /* No type for gcc_attribute_specifier_list. */ 421 /* No type for gcc_attribute_specifier. */ 422 /* No type for gcc_attribute_list. */ 423 /* No type for gcc_attribute. */ 424 /* No type for gcc_attribute_parameters. */ 425 %type <y_in_system_header> sys 426 427 %% 428 429 program: 430 /* empty */ { 431 /* TODO: Make this an error in C99 mode as well. */ 432 if (!allow_trad && !allow_c99) { 433 /* empty translation unit */ 434 error(272); 435 } else if (allow_c90) { 436 /* empty translation unit */ 437 warning(272); 438 } 439 } 440 | translation_unit 441 ; 442 443 identifier_sym: /* helper for struct/union/enum */ 444 identifier { 445 $$ = getsym($1); 446 } 447 ; 448 449 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 450 identifier: 451 T_NAME { 452 debug_step("cgram: name '%s'", $1->sb_name); 453 $$ = $1; 454 } 455 | T_TYPENAME { 456 debug_step("cgram: typename '%s'", $1->sb_name); 457 $$ = $1; 458 } 459 ; 460 461 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 462 string: 463 T_STRING 464 | string T_STRING { 465 if (!allow_c90) { 466 /* concatenated strings are illegal in traditional C */ 467 warning(219); 468 } 469 $$ = cat_strings($1, $2); 470 } 471 ; 472 473 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 474 primary_expression: 475 T_NAME { 476 bool sys_name, sys_next; 477 sys_name = in_system_header; 478 if (yychar < 0) 479 yychar = yylex(); 480 sys_next = in_system_header; 481 in_system_header = sys_name; 482 $$ = build_name(getsym($1), yychar == T_LPAREN); 483 in_system_header = sys_next; 484 } 485 | T_CON { 486 $$ = build_constant(gettyp($1->v_tspec), $1); 487 } 488 | string { 489 $$ = build_string($1); 490 } 491 | T_LPAREN expression T_RPAREN { 492 if ($2 != NULL) 493 $2->tn_parenthesized = true; 494 $$ = $2; 495 } 496 | generic_selection 497 /* GCC primary-expression, see c_parser_postfix_expression */ 498 /* TODO: C99 7.17p3 allows not only an identifier but a designator. */ 499 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 500 set_symtyp(FMEMBER); 501 $$ = build_offsetof($3, getsym($5)); 502 } 503 ; 504 505 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 506 generic_selection: 507 T_GENERIC T_LPAREN assignment_expression T_COMMA 508 generic_assoc_list T_RPAREN { 509 /* generic selection requires C11 or later */ 510 c11ism(345); 511 $$ = build_generic_selection($3, $5); 512 } 513 ; 514 515 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 516 generic_assoc_list: 517 generic_association 518 | generic_assoc_list T_COMMA generic_association { 519 $3->ga_prev = $1; 520 $$ = $3; 521 } 522 ; 523 524 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 525 generic_association: 526 type_name T_COLON assignment_expression { 527 $$ = block_zero_alloc(sizeof(*$$), "generic"); 528 $$->ga_arg = $1; 529 $$->ga_result = $3; 530 } 531 | T_DEFAULT T_COLON assignment_expression { 532 $$ = block_zero_alloc(sizeof(*$$), "generic"); 533 $$->ga_arg = NULL; 534 $$->ga_result = $3; 535 } 536 ; 537 538 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 539 postfix_expression: 540 primary_expression 541 | postfix_expression T_LBRACK sys expression T_RBRACK { 542 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 543 } 544 | postfix_expression T_LPAREN sys T_RPAREN { 545 $$ = build_function_call($1, $3, NULL); 546 } 547 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 548 $$ = build_function_call($1, $3, $4); 549 } 550 | postfix_expression point_or_arrow sys T_NAME { 551 $$ = build_member_access($1, $2, $3, $4); 552 } 553 | postfix_expression T_INCDEC sys { 554 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 555 } 556 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 557 sym_t *tmp = mktempsym($2); 558 begin_initialization(tmp); 559 cgram_declare(tmp, true, NULL); 560 } braced_initializer { 561 if (!allow_c99) 562 /* compound literals are a C99/GCC extension */ 563 gnuism(319); 564 $$ = build_name(current_initsym(), false); 565 end_initialization(); 566 } 567 | T_LPAREN compound_statement_lbrace { 568 begin_statement_expr(); 569 } gcc_statement_expr_list { 570 do_statement_expr($4); 571 } compound_statement_rbrace T_RPAREN { 572 $$ = end_statement_expr(); 573 } 574 ; 575 576 comma_opt: /* helper for 'postfix_expression' */ 577 /* empty */ 578 | T_COMMA 579 ; 580 581 /* 582 * The inner part of a GCC statement-expression of the form ({ ... }). 583 * 584 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 585 */ 586 gcc_statement_expr_list: 587 gcc_statement_expr_item 588 | gcc_statement_expr_list gcc_statement_expr_item { 589 $$ = $2; 590 } 591 ; 592 593 gcc_statement_expr_item: 594 declaration_or_error { 595 clear_warning_flags(); 596 $$ = NULL; 597 } 598 | non_expr_statement { 599 $$ = expr_alloc_tnode(); 600 $$->tn_type = gettyp(VOID); 601 } 602 | T_SEMI { 603 $$ = expr_alloc_tnode(); 604 $$->tn_type = gettyp(VOID); 605 } 606 | expression T_SEMI { 607 if ($1 == NULL) { /* in case of syntax errors */ 608 $$ = expr_alloc_tnode(); 609 $$->tn_type = gettyp(VOID); 610 } else { 611 /* XXX: do that only on the last name */ 612 if ($1->tn_op == NAME) 613 $1->tn_sym->s_used = true; 614 expr($1, false, false, false, false); 615 suppress_fallthrough = false; 616 $$ = $1; 617 } 618 } 619 ; 620 621 point_or_arrow: /* helper for 'postfix_expression' */ 622 T_POINT { 623 set_symtyp(FMEMBER); 624 $$ = POINT; 625 } 626 | T_ARROW { 627 set_symtyp(FMEMBER); 628 $$ = ARROW; 629 } 630 ; 631 632 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 633 argument_expression_list: 634 assignment_expression { 635 $$ = build_function_argument(NULL, $1); 636 } 637 | argument_expression_list T_COMMA assignment_expression { 638 $$ = build_function_argument($1, $3); 639 } 640 ; 641 642 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 643 unary_expression: 644 postfix_expression 645 | T_INCDEC sys unary_expression { 646 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 647 } 648 | T_AMPER sys cast_expression { 649 $$ = build_unary(ADDR, $2, $3); 650 } 651 | T_ASTERISK sys cast_expression { 652 $$ = build_unary(INDIR, $2, $3); 653 } 654 | T_ADDITIVE sys cast_expression { 655 if (!allow_c90 && $1 == PLUS) { 656 /* unary '+' is illegal in traditional C */ 657 warning(100); 658 } 659 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 660 } 661 | T_COMPLEMENT sys cast_expression { 662 $$ = build_unary(COMPL, $2, $3); 663 } 664 | T_LOGNOT sys cast_expression { 665 $$ = build_unary(NOT, $2, $3); 666 } 667 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 668 $$ = build_unary(REAL, $2, $3); 669 } 670 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 671 $$ = build_unary(IMAG, $2, $3); 672 } 673 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 674 $$ = $2; 675 } 676 | T_SIZEOF unary_expression { 677 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 678 if ($$ != NULL) 679 check_expr_misc($2, 680 false, false, false, false, false, true); 681 } 682 | T_SIZEOF T_LPAREN type_name T_RPAREN { 683 $$ = build_sizeof($3); 684 } 685 | T_ALIGNOF unary_expression { 686 /* non type argument to alignof is a GCC extension */ 687 gnuism(349); 688 lint_assert($2 != NULL); 689 $$ = build_alignof($2->tn_type); 690 } 691 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 692 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 693 /* TODO: c11ism */ 694 $$ = build_alignof($3); 695 } 696 ; 697 698 /* The rule 'unary_operator' is inlined into unary_expression. */ 699 700 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 701 cast_expression: 702 unary_expression 703 | T_LPAREN type_name T_RPAREN cast_expression { 704 $$ = cast($4, $2); 705 } 706 ; 707 708 expression_opt: 709 /* empty */ { 710 $$ = NULL; 711 } 712 | expression 713 ; 714 715 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 716 /* 'conditional_expression' also implements 'additive_expression'. */ 717 /* 'conditional_expression' also implements 'shift_expression'. */ 718 /* 'conditional_expression' also implements 'relational_expression'. */ 719 /* 'conditional_expression' also implements 'equality_expression'. */ 720 /* 'conditional_expression' also implements 'AND_expression'. */ 721 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 722 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 723 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 724 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 725 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 726 conditional_expression: 727 cast_expression 728 | conditional_expression T_ASTERISK sys conditional_expression { 729 $$ = build_binary($1, MULT, $3, $4); 730 } 731 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 732 $$ = build_binary($1, $2, $3, $4); 733 } 734 | conditional_expression T_ADDITIVE sys conditional_expression { 735 $$ = build_binary($1, $2, $3, $4); 736 } 737 | conditional_expression T_SHIFT sys conditional_expression { 738 $$ = build_binary($1, $2, $3, $4); 739 } 740 | conditional_expression T_RELATIONAL sys conditional_expression { 741 $$ = build_binary($1, $2, $3, $4); 742 } 743 | conditional_expression T_EQUALITY sys conditional_expression { 744 $$ = build_binary($1, $2, $3, $4); 745 } 746 | conditional_expression T_AMPER sys conditional_expression { 747 $$ = build_binary($1, BITAND, $3, $4); 748 } 749 | conditional_expression T_BITXOR sys conditional_expression { 750 $$ = build_binary($1, BITXOR, $3, $4); 751 } 752 | conditional_expression T_BITOR sys conditional_expression { 753 $$ = build_binary($1, BITOR, $3, $4); 754 } 755 | conditional_expression T_LOGAND sys conditional_expression { 756 $$ = build_binary($1, LOGAND, $3, $4); 757 } 758 | conditional_expression T_LOGOR sys conditional_expression { 759 $$ = build_binary($1, LOGOR, $3, $4); 760 } 761 | conditional_expression T_QUEST sys 762 expression T_COLON sys conditional_expression { 763 $$ = build_binary($1, QUEST, $3, 764 build_binary($4, COLON, $6, $7)); 765 } 766 ; 767 768 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 769 assignment_expression: 770 conditional_expression 771 | unary_expression T_ASSIGN sys assignment_expression { 772 $$ = build_binary($1, ASSIGN, $3, $4); 773 } 774 | unary_expression T_OPASSIGN sys assignment_expression { 775 $$ = build_binary($1, $2, $3, $4); 776 } 777 ; 778 779 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 780 expression: 781 assignment_expression 782 | expression T_COMMA sys assignment_expression { 783 $$ = build_binary($1, COMMA, $3, $4); 784 } 785 ; 786 787 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 788 constant_expression: 789 conditional_expression 790 ; 791 792 declaration_or_error: 793 declaration 794 | error T_SEMI 795 ; 796 797 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 798 declaration: 799 begin_type_declmods end_type T_SEMI { 800 if (dcs->d_scl == TYPEDEF) { 801 /* typedef declares no type name */ 802 warning(72); 803 } else { 804 /* empty declaration */ 805 warning(2); 806 } 807 } 808 | begin_type_declmods end_type notype_init_declarators T_SEMI { 809 if (dcs->d_scl == TYPEDEF) { 810 /* syntax error '%s' */ 811 error(249, "missing base type for typedef"); 812 } else { 813 /* old-style declaration; add 'int' */ 814 error(1); 815 } 816 } 817 | begin_type_declaration_specifiers end_type T_SEMI { 818 if (dcs->d_scl == TYPEDEF) { 819 /* typedef declares no type name */ 820 warning(72); 821 } else if (!dcs->d_nonempty_decl) { 822 /* empty declaration */ 823 warning(2); 824 } 825 } 826 | begin_type_declaration_specifiers end_type 827 type_init_declarators T_SEMI 828 | static_assert_declaration 829 ; 830 831 begin_type_declaration_specifiers: /* see C99 6.7 */ 832 begin_type_typespec { 833 dcs_add_type($1); 834 } 835 | begin_type_declmods type_specifier { 836 dcs_add_type($2); 837 } 838 | type_attribute begin_type_declaration_specifiers 839 | begin_type_declaration_specifiers declmod 840 | begin_type_declaration_specifiers notype_type_specifier { 841 dcs_add_type($2); 842 } 843 ; 844 845 begin_type_declmods: /* see C99 6.7 */ 846 begin_type type_qualifier { 847 dcs_add_qualifiers($2); 848 } 849 | begin_type T_SCLASS { 850 dcs_add_storage_class($2); 851 } 852 | begin_type T_FUNCTION_SPECIFIER { 853 dcs_add_function_specifier($2); 854 } 855 | begin_type_declmods declmod 856 ; 857 858 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 859 begin_type_specifier_qualifier_list_postfix 860 | type_attribute_list begin_type_specifier_qualifier_list_postfix 861 ; 862 863 begin_type_specifier_qualifier_list_postfix: 864 begin_type_typespec { 865 dcs_add_type($1); 866 } 867 | begin_type_qualifier_list type_specifier { 868 dcs_add_type($2); 869 } 870 | begin_type_specifier_qualifier_list_postfix type_qualifier { 871 dcs_add_qualifiers($2); 872 } 873 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 874 dcs_add_type($2); 875 } 876 | begin_type_specifier_qualifier_list_postfix type_attribute 877 ; 878 879 begin_type_typespec: 880 begin_type notype_type_specifier { 881 $$ = $2; 882 } 883 | begin_type T_TYPENAME { 884 $$ = getsym($2)->s_type; 885 } 886 ; 887 888 begin_type_qualifier_list: 889 begin_type type_qualifier { 890 dcs_add_qualifiers($2); 891 } 892 | begin_type_qualifier_list type_qualifier { 893 dcs_add_qualifiers($2); 894 } 895 ; 896 897 declmod: 898 type_qualifier { 899 dcs_add_qualifiers($1); 900 } 901 | T_SCLASS { 902 dcs_add_storage_class($1); 903 } 904 | T_FUNCTION_SPECIFIER { 905 dcs_add_function_specifier($1); 906 } 907 | type_attribute_list 908 ; 909 910 type_attribute_list_opt: 911 /* empty */ 912 | type_attribute_list 913 ; 914 915 type_attribute_list: 916 type_attribute 917 | type_attribute_list type_attribute 918 ; 919 920 type_attribute_opt: 921 /* empty */ 922 | type_attribute 923 ; 924 925 type_attribute: /* See C11 6.7 declaration-specifiers */ 926 gcc_attribute_specifier 927 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 928 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 929 | T_PACKED { 930 dcs_add_packed(); 931 } 932 ; 933 934 begin_type: 935 /* empty */ { 936 dcs_begin_type(); 937 } 938 ; 939 940 end_type: 941 /* empty */ { 942 dcs_end_type(); 943 } 944 ; 945 946 type_specifier: /* C99 6.7.2 */ 947 notype_type_specifier 948 | T_TYPENAME { 949 $$ = getsym($1)->s_type; 950 } 951 ; 952 953 notype_type_specifier: /* see C99 6.7.2 */ 954 T_TYPE { 955 $$ = gettyp($1); 956 } 957 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 958 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 959 $$->t_typeof = true; 960 } 961 | atomic_type_specifier 962 | struct_or_union_specifier { 963 end_declaration_level(); 964 $$ = $1; 965 } 966 | enum_specifier { 967 end_declaration_level(); 968 $$ = $1; 969 } 970 ; 971 972 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 973 atomic_type_specifier: 974 atomic T_LPAREN type_name T_RPAREN { 975 $$ = $3; 976 } 977 ; 978 979 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 980 struct_or_union_specifier: 981 struct_or_union identifier_sym { 982 /* 983 * STDC requires that "struct a;" always introduces 984 * a new tag if "a" is not declared at current level 985 * 986 * yychar is valid because otherwise the parser would not 987 * have been able to decide if it must shift or reduce 988 */ 989 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 990 } 991 | struct_or_union identifier_sym { 992 dcs->d_tag_type = make_tag_type($2, $1, true, false); 993 } braced_member_declaration_list { 994 $$ = complete_struct_or_union($4); 995 } 996 | struct_or_union { 997 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 998 } braced_member_declaration_list { 999 $$ = complete_struct_or_union($3); 1000 } 1001 | struct_or_union error { 1002 set_symtyp(FVFT); 1003 $$ = gettyp(INT); 1004 } 1005 ; 1006 1007 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1008 struct_or_union: 1009 T_STRUCT_OR_UNION { 1010 set_symtyp(FTAG); 1011 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1012 dcs->d_sou_size_in_bits = 0; 1013 dcs->d_sou_align_in_bits = CHAR_SIZE; 1014 $$ = $1; 1015 } 1016 | struct_or_union type_attribute 1017 ; 1018 1019 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1020 member_declaration_lbrace member_declaration_list_with_rbrace { 1021 $$ = $2; 1022 } 1023 ; 1024 1025 member_declaration_lbrace: /* see C99 6.7.2.1 */ 1026 T_LBRACE { 1027 set_symtyp(FVFT); 1028 } 1029 ; 1030 1031 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1032 member_declaration_list T_RBRACE 1033 | T_RBRACE { 1034 /* XXX: This is not allowed by any C standard. */ 1035 $$ = NULL; 1036 } 1037 ; 1038 1039 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1040 /* Was named struct_declaration_list until C11. */ 1041 member_declaration_list: 1042 member_declaration 1043 | member_declaration_list member_declaration { 1044 $$ = concat_symbols($1, $2); 1045 } 1046 ; 1047 1048 /* Was named struct_declaration until C11. */ 1049 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1050 member_declaration: 1051 begin_type_qualifier_list end_type { 1052 /* ^^ There is no check for the missing type-specifier. */ 1053 /* too late, i know, but getsym() compensates it */ 1054 set_symtyp(FMEMBER); 1055 } notype_member_declarators T_SEMI { 1056 set_symtyp(FVFT); 1057 $$ = $4; 1058 } 1059 | begin_type_specifier_qualifier_list end_type { 1060 set_symtyp(FMEMBER); 1061 } type_member_declarators T_SEMI { 1062 set_symtyp(FVFT); 1063 $$ = $4; 1064 } 1065 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1066 /* syntax error '%s' */ 1067 error(249, "member without type"); 1068 $$ = NULL; 1069 } 1070 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1071 T_SEMI { 1072 set_symtyp(FVFT); 1073 if (!allow_c11 && !allow_gcc) 1074 /* anonymous struct/union members is a C11 feature */ 1075 warning(49); 1076 if (is_struct_or_union(dcs->d_type->t_tspec)) 1077 $$ = declare_unnamed_member(); 1078 else { 1079 /* syntax error '%s' */ 1080 error(249, "unnamed member"); 1081 $$ = NULL; 1082 } 1083 } 1084 | static_assert_declaration { 1085 $$ = NULL; 1086 } 1087 | error T_SEMI { 1088 set_symtyp(FVFT); 1089 $$ = NULL; 1090 } 1091 ; 1092 1093 /* Was named struct_declarators until C11. */ 1094 notype_member_declarators: 1095 notype_member_declarator { 1096 $$ = declare_member($1); 1097 } 1098 | notype_member_declarators { 1099 set_symtyp(FMEMBER); 1100 } T_COMMA type_member_declarator { 1101 $$ = concat_symbols($1, declare_member($4)); 1102 } 1103 ; 1104 1105 /* Was named struct_declarators until C11. */ 1106 type_member_declarators: 1107 type_member_declarator { 1108 $$ = declare_member($1); 1109 } 1110 | type_member_declarators { 1111 set_symtyp(FMEMBER); 1112 } T_COMMA type_member_declarator { 1113 $$ = concat_symbols($1, declare_member($4)); 1114 } 1115 ; 1116 1117 /* Was named struct_declarator until C11. */ 1118 notype_member_declarator: 1119 notype_declarator 1120 /* C99 6.7.2.1 */ 1121 | notype_declarator T_COLON constant_expression { 1122 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1123 } 1124 /* C99 6.7.2.1 */ 1125 | { 1126 set_symtyp(FVFT); 1127 } T_COLON constant_expression { 1128 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1129 } 1130 ; 1131 1132 /* Was named struct_declarator until C11. */ 1133 type_member_declarator: 1134 type_declarator 1135 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1136 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1137 } 1138 | { 1139 set_symtyp(FVFT); 1140 } T_COLON constant_expression type_attribute_list_opt { 1141 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1142 } 1143 ; 1144 1145 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1146 enum_specifier: 1147 enum gcc_attribute_specifier_list_opt identifier_sym { 1148 $$ = make_tag_type($3, ENUM, false, false); 1149 } 1150 | enum gcc_attribute_specifier_list_opt identifier_sym { 1151 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1152 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1153 $$ = complete_enum($5); 1154 } 1155 | enum gcc_attribute_specifier_list_opt { 1156 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1157 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1158 $$ = complete_enum($4); 1159 } 1160 | enum error { 1161 set_symtyp(FVFT); 1162 $$ = gettyp(INT); 1163 } 1164 ; 1165 1166 enum: /* helper for C99 6.7.2.2 */ 1167 T_ENUM { 1168 set_symtyp(FTAG); 1169 begin_declaration_level(DLK_ENUM); 1170 } 1171 ; 1172 1173 enum_declaration: /* helper for C99 6.7.2.2 */ 1174 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1175 $$ = $2; 1176 } 1177 ; 1178 1179 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1180 T_LBRACE { 1181 set_symtyp(FVFT); 1182 enumval = 0; 1183 } 1184 ; 1185 1186 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1187 enumerator_list 1188 | enumerator_list T_COMMA { 1189 if (!allow_c99 && !allow_trad) { 1190 /* trailing ',' in enum declaration requires C99 ... */ 1191 error(54); 1192 } else { 1193 /* trailing ',' in enum declaration requires C99 ... */ 1194 c99ism(54); 1195 } 1196 $$ = $1; 1197 } 1198 ; 1199 1200 enumerator_list: /* C99 6.7.2.2 */ 1201 enumerator 1202 | enumerator_list T_COMMA enumerator { 1203 $$ = concat_symbols($1, $3); 1204 } 1205 | error { 1206 $$ = NULL; 1207 } 1208 ; 1209 1210 enumerator: /* C99 6.7.2.2 */ 1211 identifier_sym gcc_attribute_specifier_list_opt { 1212 $$ = enumeration_constant($1, enumval, true); 1213 } 1214 | identifier_sym gcc_attribute_specifier_list_opt 1215 T_ASSIGN constant_expression { 1216 $$ = enumeration_constant($1, to_int_constant($4, true), 1217 false); 1218 } 1219 ; 1220 1221 type_qualifier: /* C99 6.7.3 */ 1222 T_QUAL 1223 | atomic { 1224 $$ = (type_qualifiers){ .tq_atomic = true }; 1225 } 1226 ; 1227 1228 atomic: /* helper */ 1229 T_ATOMIC { 1230 /* TODO: First fix c11ism, then use it here. */ 1231 if (!allow_c11) 1232 /* '_Atomic' requires C11 or later */ 1233 error(350); 1234 } 1235 ; 1236 1237 pointer: /* C99 6.7.5 */ 1238 T_ASTERISK type_qualifier_list_opt { 1239 $$ = xcalloc(1, sizeof(*$$)); 1240 add_type_qualifiers(&$$->qualifiers, $2); 1241 } 1242 | T_ASTERISK type_qualifier_list_opt pointer { 1243 $$ = xcalloc(1, sizeof(*$$)); 1244 add_type_qualifiers(&$$->qualifiers, $2); 1245 $$ = append_qualified_pointer($$, $3); 1246 } 1247 ; 1248 1249 type_qualifier_list_opt: /* see C99 6.7.5 */ 1250 /* empty */ { 1251 $$ = (type_qualifiers){ .tq_const = false }; 1252 } 1253 | type_qualifier_list 1254 ; 1255 1256 type_qualifier_list: /* C99 6.7.5 */ 1257 type_qualifier 1258 | type_qualifier_list type_qualifier { 1259 $$ = $1; 1260 add_type_qualifiers(&$$, $2); 1261 } 1262 ; 1263 1264 /* 1265 * For an explanation of 'notype' in the following rules, see 1266 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1267 */ 1268 1269 notype_init_declarators: 1270 notype_init_declarator 1271 | notype_init_declarators T_COMMA type_init_declarator 1272 ; 1273 1274 type_init_declarators: 1275 type_init_declarator 1276 | type_init_declarators T_COMMA type_init_declarator 1277 ; 1278 1279 notype_init_declarator: 1280 notype_declarator asm_or_symbolrename_opt { 1281 cgram_declare($1, false, $2); 1282 check_size($1); 1283 } 1284 | notype_declarator asm_or_symbolrename_opt { 1285 begin_initialization($1); 1286 cgram_declare($1, true, $2); 1287 } T_ASSIGN initializer { 1288 check_size($1); 1289 end_initialization(); 1290 } 1291 ; 1292 1293 type_init_declarator: 1294 type_declarator asm_or_symbolrename_opt { 1295 cgram_declare($1, false, $2); 1296 check_size($1); 1297 } 1298 | type_declarator asm_or_symbolrename_opt { 1299 begin_initialization($1); 1300 cgram_declare($1, true, $2); 1301 } T_ASSIGN initializer { 1302 check_size($1); 1303 end_initialization(); 1304 } 1305 ; 1306 1307 notype_declarator: 1308 notype_direct_declarator 1309 | pointer notype_direct_declarator { 1310 $$ = add_pointer($2, $1); 1311 } 1312 ; 1313 1314 type_declarator: 1315 type_direct_declarator 1316 | pointer type_direct_declarator { 1317 $$ = add_pointer($2, $1); 1318 } 1319 ; 1320 1321 notype_direct_declarator: 1322 type_attribute_list_opt T_NAME { 1323 $$ = declarator_name(getsym($2)); 1324 } 1325 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1326 $$ = $3; 1327 } 1328 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1329 $$ = add_array($1, $3.has_dim, $3.dim); 1330 } 1331 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1332 $$ = add_function(symbolrename($1, $3), $2); 1333 end_declaration_level(); 1334 block_level--; 1335 } 1336 | notype_direct_declarator type_attribute 1337 ; 1338 1339 type_direct_declarator: 1340 type_attribute_list_opt identifier { 1341 $$ = declarator_name(getsym($2)); 1342 } 1343 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1344 $$ = $3; 1345 } 1346 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1347 $$ = add_array($1, $3.has_dim, $3.dim); 1348 } 1349 | type_direct_declarator param_list asm_or_symbolrename_opt { 1350 $$ = add_function(symbolrename($1, $3), $2); 1351 end_declaration_level(); 1352 block_level--; 1353 } 1354 | type_direct_declarator type_attribute 1355 ; 1356 1357 /* 1358 * The two distinct rules type_param_declarator and notype_param_declarator 1359 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1360 * always treated as a typename, not an argument name. For example, after 1361 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1362 * "f(int (double));", not "f(int a);". 1363 */ 1364 type_param_declarator: 1365 direct_param_declarator 1366 | pointer direct_param_declarator { 1367 $$ = add_pointer($2, $1); 1368 } 1369 ; 1370 1371 notype_param_declarator: 1372 direct_notype_param_declarator 1373 | pointer direct_notype_param_declarator { 1374 $$ = add_pointer($2, $1); 1375 } 1376 ; 1377 1378 direct_param_declarator: 1379 identifier type_attribute_list { 1380 $$ = declarator_name(getsym($1)); 1381 } 1382 | identifier { 1383 $$ = declarator_name(getsym($1)); 1384 } 1385 | T_LPAREN notype_param_declarator T_RPAREN { 1386 $$ = $2; 1387 } 1388 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1389 gcc_attribute_specifier_list_opt { 1390 $$ = add_array($1, $3.has_dim, $3.dim); 1391 } 1392 | direct_param_declarator param_list asm_or_symbolrename_opt { 1393 $$ = add_function(symbolrename($1, $3), $2); 1394 end_declaration_level(); 1395 block_level--; 1396 } 1397 ; 1398 1399 direct_notype_param_declarator: 1400 identifier { 1401 $$ = declarator_name(getsym($1)); 1402 } 1403 | T_LPAREN notype_param_declarator T_RPAREN { 1404 $$ = $2; 1405 } 1406 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1407 $$ = add_array($1, $3.has_dim, $3.dim); 1408 } 1409 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1410 $$ = add_function(symbolrename($1, $3), $2); 1411 end_declaration_level(); 1412 block_level--; 1413 } 1414 ; 1415 1416 param_list: 1417 id_list_lparen identifier_list T_RPAREN { 1418 $$ = (struct parameter_list){ .first = $2 }; 1419 } 1420 | abstract_decl_param_list 1421 ; 1422 1423 id_list_lparen: 1424 T_LPAREN { 1425 block_level++; 1426 begin_declaration_level(DLK_PROTO_PARAMS); 1427 } 1428 ; 1429 1430 array_size_opt: 1431 /* empty */ { 1432 $$.has_dim = false; 1433 $$.dim = 0; 1434 } 1435 | T_ASTERISK { 1436 /* since C99; variable length array of unspecified size */ 1437 $$.has_dim = false; /* TODO: maybe change to true */ 1438 $$.dim = 0; /* just as a placeholder */ 1439 } 1440 | array_size { 1441 $$.has_dim = true; 1442 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1443 } 1444 ; 1445 1446 array_size: 1447 type_qualifier_list_opt T_SCLASS constant_expression { 1448 /* C11 6.7.6.3p7 */ 1449 if ($2 != STATIC) 1450 yyerror("Bad attribute"); 1451 /* static array size is a C11 extension */ 1452 c11ism(343); 1453 $$ = $3; 1454 } 1455 | type_qualifier { 1456 /* C11 6.7.6.2 */ 1457 if (!$1.tq_restrict) 1458 yyerror("Bad attribute"); 1459 $$ = NULL; 1460 } 1461 | constant_expression 1462 ; 1463 1464 identifier_list: /* C99 6.7.5 */ 1465 T_NAME { 1466 $$ = old_style_function_parameter_name(getsym($1)); 1467 } 1468 | identifier_list T_COMMA T_NAME { 1469 $$ = concat_symbols($1, 1470 old_style_function_parameter_name(getsym($3))); 1471 } 1472 | identifier_list error 1473 ; 1474 1475 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1476 type_name: /* C99 6.7.6 */ 1477 { 1478 begin_declaration_level(DLK_ABSTRACT); 1479 } abstract_declaration { 1480 end_declaration_level(); 1481 $$ = $2->s_type; 1482 } 1483 ; 1484 1485 abstract_declaration: /* specific to lint */ 1486 begin_type_qualifier_list end_type { 1487 $$ = declare_abstract_type(abstract_name()); 1488 } 1489 | begin_type_specifier_qualifier_list end_type { 1490 $$ = declare_abstract_type(abstract_name()); 1491 } 1492 | begin_type_qualifier_list end_type abstract_declarator { 1493 $$ = declare_abstract_type($3); 1494 } 1495 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1496 $$ = declare_abstract_type($3); 1497 } 1498 ; 1499 1500 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1501 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1502 abstract_declarator: 1503 pointer { 1504 $$ = add_pointer(abstract_name(), $1); 1505 } 1506 | direct_abstract_declarator 1507 | pointer direct_abstract_declarator { 1508 $$ = add_pointer($2, $1); 1509 } 1510 | type_attribute_list direct_abstract_declarator { 1511 $$ = $2; 1512 } 1513 | pointer type_attribute_list direct_abstract_declarator { 1514 $$ = add_pointer($3, $1); 1515 } 1516 ; 1517 1518 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1519 direct_abstract_declarator: 1520 /* TODO: sort rules according to C99 */ 1521 T_LPAREN abstract_declarator T_RPAREN { 1522 $$ = $2; 1523 } 1524 | T_LBRACK array_size_opt T_RBRACK { 1525 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1526 } 1527 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1528 $$ = add_array($1, $3.has_dim, $3.dim); 1529 } 1530 | abstract_decl_param_list asm_or_symbolrename_opt { 1531 sym_t *name = abstract_enclosing_name(); 1532 $$ = add_function(symbolrename(name, $2), $1); 1533 end_declaration_level(); 1534 block_level--; 1535 } 1536 | direct_abstract_declarator abstract_decl_param_list 1537 asm_or_symbolrename_opt { 1538 $$ = add_function(symbolrename($1, $3), $2); 1539 end_declaration_level(); 1540 block_level--; 1541 } 1542 | direct_abstract_declarator type_attribute_list 1543 ; 1544 1545 abstract_decl_param_list: /* specific to lint */ 1546 abstract_decl_lparen T_RPAREN type_attribute_opt { 1547 $$ = (struct parameter_list){ .first = NULL }; 1548 } 1549 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1550 type_attribute_opt { 1551 $$ = $2; 1552 $$.prototype = true; 1553 } 1554 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1555 $$ = (struct parameter_list){ .first = NULL }; 1556 } 1557 ; 1558 1559 abstract_decl_lparen: /* specific to lint */ 1560 T_LPAREN { 1561 block_level++; 1562 begin_declaration_level(DLK_PROTO_PARAMS); 1563 } 1564 ; 1565 1566 vararg_parameter_type_list: /* specific to lint */ 1567 parameter_type_list 1568 | parameter_type_list T_COMMA T_ELLIPSIS { 1569 $$ = $1; 1570 $$.vararg = true; 1571 } 1572 | T_ELLIPSIS { 1573 /* TODO: C99 6.7.5 makes this an error as well. */ 1574 if (!allow_trad && !allow_c99) { 1575 /* C90 to C17 require formal parameter before '...' */ 1576 error(84); 1577 } else if (allow_c90) { 1578 /* C90 to C17 require formal parameter before '...' */ 1579 warning(84); 1580 } 1581 $$ = (struct parameter_list){ .vararg = true }; 1582 } 1583 ; 1584 1585 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1586 parameter_type_list: 1587 parameter_declaration { 1588 $$ = (struct parameter_list){ .first = $1 }; 1589 } 1590 | parameter_type_list T_COMMA parameter_declaration { 1591 $$ = $1; 1592 $$.first = concat_symbols($1.first, $3); 1593 } 1594 ; 1595 1596 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1597 parameter_declaration: 1598 begin_type_declmods end_type { 1599 /* ^^ There is no check for the missing type-specifier. */ 1600 $$ = declare_parameter(abstract_name(), false); 1601 } 1602 | begin_type_declaration_specifiers end_type { 1603 $$ = declare_parameter(abstract_name(), false); 1604 } 1605 | begin_type_declmods end_type notype_param_declarator { 1606 /* ^^ There is no check for the missing type-specifier. */ 1607 $$ = declare_parameter($3, false); 1608 } 1609 /* 1610 * type_param_declarator is needed because of following conflict: 1611 * "typedef int a; f(int (a));" could be parsed as 1612 * "function with argument a of type int", or 1613 * "function with an unnamed (abstract) argument of type function". 1614 * This grammar realizes the second case. 1615 */ 1616 | begin_type_declaration_specifiers end_type type_param_declarator { 1617 $$ = declare_parameter($3, false); 1618 } 1619 | begin_type_declmods end_type abstract_declarator { 1620 /* ^^ There is no check for the missing type-specifier. */ 1621 $$ = declare_parameter($3, false); 1622 } 1623 | begin_type_declaration_specifiers end_type abstract_declarator { 1624 $$ = declare_parameter($3, false); 1625 } 1626 ; 1627 1628 braced_initializer: 1629 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1630 init_lbrace init_rbrace { 1631 /* empty initializer braces require C23 or later */ 1632 c23ism(353); 1633 } 1634 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1635 | init_lbrace initializer_list comma_opt init_rbrace 1636 ; 1637 1638 initializer: /* C99 6.7.8 "Initialization" */ 1639 assignment_expression { 1640 init_expr($1); 1641 } 1642 | init_lbrace init_rbrace { 1643 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1644 } 1645 | init_lbrace initializer_list comma_opt init_rbrace 1646 /* XXX: What is this error handling for? */ 1647 | error 1648 ; 1649 1650 initializer_list: /* C99 6.7.8 "Initialization" */ 1651 initializer_list_item 1652 | initializer_list T_COMMA initializer_list_item 1653 ; 1654 1655 initializer_list_item: /* helper */ 1656 designation initializer 1657 | initializer 1658 ; 1659 1660 designation: /* C99 6.7.8 "Initialization" */ 1661 begin_designation designator_list T_ASSIGN 1662 | identifier T_COLON { 1663 /* GCC style struct or union member name in initializer */ 1664 gnuism(315); 1665 begin_designation(); 1666 add_designator_member($1); 1667 } 1668 ; 1669 1670 begin_designation: /* lint-specific helper */ 1671 /* empty */ { 1672 begin_designation(); 1673 } 1674 ; 1675 1676 designator_list: /* C99 6.7.8 "Initialization" */ 1677 designator 1678 | designator_list designator 1679 ; 1680 1681 designator: /* C99 6.7.8 "Initialization" */ 1682 T_LBRACK range T_RBRACK { 1683 if (!allow_c99) 1684 /* array initializer with designators is a C99 ... */ 1685 warning(321); 1686 add_designator_subscript($2); 1687 } 1688 | T_POINT identifier { 1689 if (!allow_c99) 1690 /* struct or union member name in initializer is ... */ 1691 warning(313); 1692 add_designator_member($2); 1693 } 1694 ; 1695 1696 static_assert_declaration: 1697 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1698 T_RPAREN T_SEMI { 1699 /* '_Static_assert' requires C11 or later */ 1700 c11ism(354); 1701 } 1702 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1703 /* '_Static_assert' without message requires C23 or later */ 1704 c23ism(355); 1705 } 1706 ; 1707 1708 range: 1709 constant_expression { 1710 $$.lo = to_int_constant($1, true); 1711 $$.hi = $$.lo; 1712 } 1713 | constant_expression T_ELLIPSIS constant_expression { 1714 $$.lo = to_int_constant($1, true); 1715 $$.hi = to_int_constant($3, true); 1716 /* initialization with '[a...b]' is a GCC extension */ 1717 gnuism(340); 1718 } 1719 ; 1720 1721 init_lbrace: /* helper */ 1722 T_LBRACE { 1723 init_lbrace(); 1724 } 1725 ; 1726 1727 init_rbrace: /* helper */ 1728 T_RBRACE { 1729 init_rbrace(); 1730 } 1731 ; 1732 1733 asm_or_symbolrename_opt: /* GCC extensions */ 1734 /* empty */ { 1735 $$ = NULL; 1736 } 1737 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1738 freeyyv(&$3, T_STRING); 1739 $$ = NULL; 1740 } 1741 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1742 gcc_attribute_specifier_list_opt { 1743 $$ = $3; 1744 } 1745 ; 1746 1747 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1748 statement: 1749 expression_statement 1750 | non_expr_statement 1751 ; 1752 1753 non_expr_statement: /* helper for C99 6.8 */ 1754 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1755 | labeled_statement 1756 | compound_statement 1757 | selection_statement 1758 | iteration_statement 1759 | jump_statement { 1760 suppress_fallthrough = false; 1761 } 1762 | asm_statement 1763 ; 1764 1765 labeled_statement: /* C99 6.8.1 */ 1766 label gcc_attribute_specifier_list_opt statement 1767 ; 1768 1769 label: 1770 T_NAME T_COLON { 1771 set_symtyp(FLABEL); 1772 named_label(getsym($1)); 1773 } 1774 | T_CASE constant_expression T_COLON { 1775 case_label($2); 1776 suppress_fallthrough = true; 1777 } 1778 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1779 /* XXX: We don't fill all cases */ 1780 case_label($2); 1781 suppress_fallthrough = true; 1782 } 1783 | T_DEFAULT T_COLON { 1784 default_label(); 1785 suppress_fallthrough = true; 1786 } 1787 ; 1788 1789 compound_statement: /* C99 6.8.2 */ 1790 compound_statement_lbrace compound_statement_rbrace 1791 | compound_statement_lbrace block_item_list compound_statement_rbrace 1792 ; 1793 1794 compound_statement_lbrace: 1795 T_LBRACE { 1796 block_level++; 1797 mem_block_level++; 1798 debug_step("%s: mem_block_level = %zu", 1799 "compound_statement_lbrace", mem_block_level); 1800 begin_declaration_level(DLK_AUTO); 1801 } 1802 ; 1803 1804 compound_statement_rbrace: 1805 T_RBRACE { 1806 end_declaration_level(); 1807 if (!in_statement_expr()) 1808 level_free_all(mem_block_level); /* leak */ 1809 mem_block_level--; 1810 debug_step("%s: mem_block_level = %zu", 1811 "compound_statement_rbrace", mem_block_level); 1812 block_level--; 1813 suppress_fallthrough = false; 1814 } 1815 ; 1816 1817 block_item_list: /* C99 6.8.2 */ 1818 block_item 1819 | block_item_list block_item { 1820 if ($1 && !$2) 1821 /* declarations after statements is a C99 feature */ 1822 c99ism(327); 1823 $$ = $1 || $2; 1824 } 1825 ; 1826 1827 block_item: /* C99 6.8.2 */ 1828 declaration_or_error { 1829 $$ = false; 1830 restore_warning_flags(); 1831 } 1832 | statement { 1833 $$ = true; 1834 restore_warning_flags(); 1835 } 1836 ; 1837 1838 expression_statement: /* C99 6.8.3 */ 1839 expression T_SEMI { 1840 expr($1, false, false, false, false); 1841 suppress_fallthrough = false; 1842 } 1843 | T_SEMI { 1844 check_statement_reachable(); 1845 suppress_fallthrough = false; 1846 } 1847 ; 1848 1849 selection_statement: /* C99 6.8.4 */ 1850 if_without_else %prec T_THEN { 1851 save_warning_flags(); 1852 stmt_if_then_stmt(); 1853 stmt_if_else_stmt(false); 1854 } 1855 | if_without_else T_ELSE { 1856 save_warning_flags(); 1857 stmt_if_then_stmt(); 1858 } statement { 1859 clear_warning_flags(); 1860 stmt_if_else_stmt(true); 1861 } 1862 | if_without_else T_ELSE error { 1863 clear_warning_flags(); 1864 stmt_if_else_stmt(false); 1865 } 1866 | switch_expr statement { 1867 clear_warning_flags(); 1868 stmt_switch_expr_stmt(); 1869 } 1870 | switch_expr error { 1871 clear_warning_flags(); 1872 stmt_switch_expr_stmt(); 1873 } 1874 ; 1875 1876 if_without_else: /* see C99 6.8.4 */ 1877 if_expr statement 1878 | if_expr error 1879 ; 1880 1881 if_expr: /* see C99 6.8.4 */ 1882 T_IF T_LPAREN expression T_RPAREN { 1883 stmt_if_expr($3); 1884 clear_warning_flags(); 1885 } 1886 ; 1887 1888 switch_expr: /* see C99 6.8.4 */ 1889 T_SWITCH T_LPAREN expression T_RPAREN { 1890 stmt_switch_expr($3); 1891 clear_warning_flags(); 1892 } 1893 ; 1894 1895 iteration_statement: /* C99 6.8.5 */ 1896 while_expr statement { 1897 clear_warning_flags(); 1898 stmt_while_expr_stmt(); 1899 } 1900 | while_expr error { 1901 clear_warning_flags(); 1902 stmt_while_expr_stmt(); 1903 } 1904 | do_statement do_while_expr { 1905 stmt_do_while_expr($2); 1906 suppress_fallthrough = false; 1907 } 1908 | do error { 1909 clear_warning_flags(); 1910 stmt_do_while_expr(NULL); 1911 } 1912 | for_exprs statement { 1913 clear_warning_flags(); 1914 stmt_for_exprs_stmt(); 1915 end_declaration_level(); 1916 block_level--; 1917 } 1918 | for_exprs error { 1919 clear_warning_flags(); 1920 stmt_for_exprs_stmt(); 1921 end_declaration_level(); 1922 block_level--; 1923 } 1924 ; 1925 1926 while_expr: /* see C99 6.8.5 */ 1927 T_WHILE T_LPAREN expression T_RPAREN { 1928 stmt_while_expr($3); 1929 clear_warning_flags(); 1930 } 1931 ; 1932 1933 do_statement: /* see C99 6.8.5 */ 1934 do statement { 1935 clear_warning_flags(); 1936 } 1937 ; 1938 1939 do: /* see C99 6.8.5 */ 1940 T_DO { 1941 stmt_do(); 1942 } 1943 ; 1944 1945 do_while_expr: /* see C99 6.8.5 */ 1946 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1947 $$ = $3; 1948 } 1949 ; 1950 1951 for_start: /* see C99 6.8.5 */ 1952 T_FOR T_LPAREN { 1953 begin_declaration_level(DLK_AUTO); 1954 block_level++; 1955 } 1956 ; 1957 1958 for_exprs: /* see C99 6.8.5 */ 1959 for_start 1960 begin_type_declaration_specifiers end_type 1961 notype_init_declarators T_SEMI 1962 expression_opt T_SEMI 1963 expression_opt T_RPAREN { 1964 /* variable declaration in for loop */ 1965 c99ism(325); 1966 stmt_for_exprs(NULL, $6, $8); 1967 clear_warning_flags(); 1968 } 1969 | for_start 1970 expression_opt T_SEMI 1971 expression_opt T_SEMI 1972 expression_opt T_RPAREN { 1973 stmt_for_exprs($2, $4, $6); 1974 clear_warning_flags(); 1975 } 1976 ; 1977 1978 jump_statement: /* C99 6.8.6 */ 1979 goto identifier T_SEMI { 1980 stmt_goto(getsym($2)); 1981 } 1982 | goto error T_SEMI { 1983 set_symtyp(FVFT); 1984 } 1985 | T_CONTINUE T_SEMI { 1986 stmt_continue(); 1987 } 1988 | T_BREAK T_SEMI { 1989 stmt_break(); 1990 } 1991 | T_RETURN sys T_SEMI { 1992 stmt_return($2, NULL); 1993 } 1994 | T_RETURN sys expression T_SEMI { 1995 stmt_return($2, $3); 1996 } 1997 ; 1998 1999 goto: /* see C99 6.8.6 */ 2000 T_GOTO { 2001 set_symtyp(FLABEL); 2002 } 2003 ; 2004 2005 asm_statement: /* GCC extension */ 2006 T_ASM T_LPAREN read_until_rparen T_SEMI { 2007 dcs_set_asm(); 2008 } 2009 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2010 dcs_set_asm(); 2011 } 2012 | T_ASM error 2013 ; 2014 2015 read_until_rparen: /* helper for 'asm_statement' */ 2016 /* empty */ { 2017 read_until_rparen(); 2018 } 2019 ; 2020 2021 translation_unit: /* C99 6.9 */ 2022 external_declaration 2023 | translation_unit external_declaration 2024 ; 2025 2026 external_declaration: /* C99 6.9 */ 2027 function_definition { 2028 global_clean_up_decl(false); 2029 clear_warning_flags(); 2030 } 2031 | top_level_declaration { 2032 global_clean_up_decl(false); 2033 clear_warning_flags(); 2034 } 2035 | asm_statement /* GCC extension */ 2036 | T_SEMI { /* GCC extension */ 2037 /* 2038 * TODO: Only allow this in GCC mode, not in plain C99. 2039 * This is one of the top 10 warnings in the NetBSD build. 2040 */ 2041 if (!allow_trad && !allow_c99) { 2042 /* empty declaration */ 2043 error(0); 2044 } else if (allow_c90) { 2045 /* empty declaration */ 2046 warning(0); 2047 } 2048 } 2049 ; 2050 2051 /* 2052 * On the top level, lint allows several forms of declarations that it doesn't 2053 * allow in functions. For example, a single ';' is an empty declaration and 2054 * is supported by some compilers, but in a function it would be an empty 2055 * statement, not a declaration. This makes a difference in C90 mode, where 2056 * a statement must not be followed by a declaration. 2057 * 2058 * See 'declaration' for all other declarations. 2059 */ 2060 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2061 begin_type end_type notype_init_declarators T_SEMI { 2062 /* TODO: Make this an error in C99 mode as well. */ 2063 if (!allow_trad && !allow_c99) { 2064 /* old-style declaration; add 'int' */ 2065 error(1); 2066 } else if (allow_c90) { 2067 /* old-style declaration; add 'int' */ 2068 warning(1); 2069 } 2070 } 2071 | declaration 2072 | error T_SEMI { 2073 global_clean_up(); 2074 } 2075 | error T_RBRACE { 2076 global_clean_up(); 2077 } 2078 ; 2079 2080 function_definition: /* C99 6.9.1 */ 2081 func_declarator { 2082 if ($1->s_type->t_tspec != FUNC) { 2083 /* syntax error '%s' */ 2084 error(249, yytext); 2085 YYERROR; 2086 } 2087 if ($1->s_type->t_typedef) { 2088 /* ()-less function definition */ 2089 error(64); 2090 YYERROR; 2091 } 2092 check_extern_declaration($1); 2093 begin_function($1); 2094 block_level++; 2095 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2096 if (lwarn == LWARN_NONE) 2097 $1->s_used = true; 2098 } arg_declaration_list_opt { 2099 end_declaration_level(); 2100 block_level--; 2101 check_func_lint_directives(); 2102 check_func_old_style_parameters(); 2103 begin_control_statement(CS_FUNCTION_BODY); 2104 } compound_statement { 2105 end_function(); 2106 end_control_statement(CS_FUNCTION_BODY); 2107 } 2108 ; 2109 2110 func_declarator: 2111 begin_type end_type notype_declarator { 2112 if (!allow_trad) { 2113 /* old-style declaration; add 'int' */ 2114 error(1); 2115 } 2116 $$ = $3; 2117 } 2118 | begin_type_declmods end_type notype_declarator { 2119 if (!allow_trad) { 2120 /* old-style declaration; add 'int' */ 2121 error(1); 2122 } 2123 $$ = $3; 2124 } 2125 | begin_type_declaration_specifiers end_type type_declarator { 2126 $$ = $3; 2127 } 2128 ; 2129 2130 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2131 /* empty */ 2132 | arg_declaration_list 2133 ; 2134 2135 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2136 arg_declaration 2137 | arg_declaration_list arg_declaration 2138 /* XXX or better "arg_declaration error" ? */ 2139 | error 2140 ; 2141 2142 /* 2143 * "arg_declaration" is separated from "declaration" because it 2144 * needs other error handling. 2145 */ 2146 arg_declaration: 2147 begin_type_declmods end_type T_SEMI { 2148 /* empty declaration */ 2149 warning(2); 2150 } 2151 | begin_type_declmods end_type notype_init_declarators T_SEMI 2152 | begin_type_declaration_specifiers end_type T_SEMI { 2153 if (!dcs->d_nonempty_decl) { 2154 /* empty declaration */ 2155 warning(2); 2156 } else { 2157 /* '%s' declared in parameter declaration list */ 2158 warning(3, type_name(dcs->d_type)); 2159 } 2160 } 2161 | begin_type_declaration_specifiers end_type 2162 type_init_declarators T_SEMI { 2163 if (dcs->d_nonempty_decl) { 2164 /* '%s' declared in parameter declaration list */ 2165 warning(3, type_name(dcs->d_type)); 2166 } 2167 } 2168 | begin_type_declmods error 2169 | begin_type_declaration_specifiers error 2170 ; 2171 2172 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2173 gcc_attribute_specifier_list_opt: 2174 /* empty */ 2175 | gcc_attribute_specifier_list 2176 ; 2177 2178 gcc_attribute_specifier_list: 2179 gcc_attribute_specifier 2180 | gcc_attribute_specifier_list gcc_attribute_specifier 2181 ; 2182 2183 gcc_attribute_specifier: 2184 T_ATTRIBUTE T_LPAREN T_LPAREN { 2185 in_gcc_attribute = true; 2186 } gcc_attribute_list { 2187 in_gcc_attribute = false; 2188 } T_RPAREN T_RPAREN 2189 ; 2190 2191 gcc_attribute_list: 2192 gcc_attribute 2193 | gcc_attribute_list T_COMMA gcc_attribute 2194 ; 2195 2196 gcc_attribute: 2197 /* empty */ 2198 | T_NAME { 2199 const char *name = $1->sb_name; 2200 if (is_either(name, "packed", "__packed__")) 2201 dcs_add_packed(); 2202 else if (is_either(name, "used", "__used__") || 2203 is_either(name, "unused", "__unused__")) 2204 dcs_set_used(); 2205 else if (is_either(name, "fallthrough", "__fallthrough__")) 2206 suppress_fallthrough = true; 2207 } 2208 | T_NAME T_LPAREN T_RPAREN 2209 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2210 | type_qualifier { 2211 if (!$1.tq_const) 2212 yyerror("Bad attribute"); 2213 } 2214 ; 2215 2216 gcc_attribute_parameters: 2217 constant_expression 2218 | gcc_attribute_parameters T_COMMA constant_expression 2219 ; 2220 2221 sys: 2222 /* empty */ { 2223 $$ = in_system_header; 2224 } 2225 ; 2226 2227 %% 2228 2229 /* ARGSUSED */ 2230 int 2231 yyerror(const char *msg) 2232 { 2233 /* syntax error '%s' */ 2234 error(249, yytext); 2235 if (++sytxerr >= 5) 2236 norecover(); 2237 return 0; 2238 } 2239 2240 #if YYDEBUG && YYBYACC 2241 static const char * 2242 cgram_to_string(int token, YYSTYPE val) 2243 { 2244 2245 switch (token) { 2246 case T_INCDEC: 2247 case T_MULTIPLICATIVE: 2248 case T_ADDITIVE: 2249 case T_SHIFT: 2250 case T_RELATIONAL: 2251 case T_EQUALITY: 2252 case T_OPASSIGN: 2253 return op_name(val.y_op); 2254 case T_SCLASS: 2255 return scl_name(val.y_scl); 2256 case T_TYPE: 2257 case T_STRUCT_OR_UNION: 2258 return tspec_name(val.y_tspec); 2259 case T_QUAL: 2260 return type_qualifiers_string(val.y_type_qualifiers); 2261 case T_FUNCTION_SPECIFIER: 2262 return function_specifier_name(val.y_function_specifier); 2263 case T_NAME: 2264 return val.y_name->sb_name; 2265 default: 2266 return "<none>"; 2267 } 2268 } 2269 #endif 2270 2271 static void 2272 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2273 { 2274 declare(decl, has_initializer, renaming); 2275 if (renaming != NULL) 2276 freeyyv(&renaming, T_NAME); 2277 } 2278 2279 /* 2280 * Discard all input tokens up to and including the next 2281 * unmatched right paren 2282 */ 2283 static void 2284 read_until_rparen(void) 2285 { 2286 int level; 2287 2288 if (yychar < 0) 2289 yychar = yylex(); 2290 freeyyv(&yylval, yychar); 2291 2292 level = 1; 2293 while (yychar > 0) { 2294 if (yychar == T_LPAREN) 2295 level++; 2296 if (yychar == T_RPAREN && --level == 0) 2297 break; 2298 freeyyv(&yylval, yychar = yylex()); 2299 } 2300 2301 yyclearin; 2302 } 2303 2304 static sym_t * 2305 symbolrename(sym_t *s, sbuf_t *sb) 2306 { 2307 if (sb != NULL) 2308 s->s_rename = sb->sb_name; 2309 return s; 2310 } 2311
Indexes created Fri Oct 03 02:09:57 GMT 2025