cgram.y revision 1.491
1 %{ 2 /* $NetBSD: cgram.y,v 1.491 2024/03/09 13:54:47 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 1.491 2024/03/09 13:54:47 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 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 89 saved_lwarn = lwarn; 90 } 91 92 /* ARGSUSED */ 93 static void 94 restore_warning_flags_loc(const char *file, size_t line) 95 { 96 if (saved_lwarn != LWARN_NOTHING_SAVED) { 97 lwarn = saved_lwarn; 98 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 99 } else 100 clear_warning_flags_loc(file, line); 101 } 102 103 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 104 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 105 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 106 107 static bool 108 is_either(const char *s, const char *a, const char *b) 109 { 110 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 111 } 112 113 #if YYDEBUG && YYBYACC 114 #define YYSTYPE_TOSTRING cgram_to_string 115 #endif 116 117 %} 118 119 %expect 103 120 121 %union { 122 val_t *y_val; 123 sbuf_t *y_name; 124 sym_t *y_sym; 125 bool y_inc; 126 op_t y_op; 127 scl_t y_scl; 128 tspec_t y_tspec; 129 type_qualifiers y_type_qualifiers; 130 function_specifier y_function_specifier; 131 parameter_list y_parameter_list; 132 function_call *y_arguments; 133 type_t *y_type; 134 tnode_t *y_tnode; 135 range_t y_range; 136 buffer *y_string; 137 qual_ptr *y_qual_ptr; 138 bool y_seen_statement; 139 struct generic_association *y_generic; 140 array_size y_array_size; 141 bool y_in_system_header; 142 designation y_designation; 143 }; 144 145 /* for Bison: 146 %printer { 147 if (is_integer($$->v_tspec)) 148 fprintf(yyo, "%lld", (long long)$$->u.integer); 149 else 150 fprintf(yyo, "%Lg", $$->u.floating); 151 } <y_val> 152 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 153 %printer { 154 bool indented = debug_push_indented(true); 155 debug_sym("", $$, ""); 156 debug_pop_indented(indented); 157 } <y_sym> 158 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 159 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 160 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 161 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 162 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 163 %printer { 164 fprintf(yyo, "%s", function_specifier_name($$)); 165 } <y_function_specifier> 166 %printer { 167 size_t n = 0; 168 for (const sym_t *p = $$.first; p != NULL; p = p->s_next) 169 n++; 170 fprintf(yyo, "%zu parameter%s", n, n != 1 ? "s" : ""); 171 } <y_parameter_list> 172 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 173 %printer { 174 if ($$ == NULL) 175 fprintf(yyo, "<null>"); 176 else 177 fprintf(yyo, "%s '%s'", 178 op_name($$->tn_op), type_name($$->tn_type)); 179 } <y_tnode> 180 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 181 %printer { fprintf(yyo, "length %zu", $$->len); } <y_string> 182 %printer { 183 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 184 } <y_qual_ptr> 185 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 186 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 187 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 188 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 189 %printer { 190 if ($$.dn_len == 0) 191 fprintf(yyo, "(empty)"); 192 for (size_t i = 0; i < $$.dn_len; i++) { 193 const designator *dr = $$.dn_items + i; 194 if (dr->dr_kind == DK_MEMBER) 195 fprintf(yyo, ".%s", dr->dr_member->s_name); 196 else if (dr->dr_kind == DK_SUBSCRIPT) 197 fprintf(yyo, "[%zu]", dr->dr_subscript); 198 else 199 fprintf(yyo, "<scalar>"); 200 } 201 } <y_designation> 202 */ 203 204 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 205 %token T_POINT T_ARROW 206 %token T_COMPLEMENT T_LOGNOT 207 %token <y_inc> T_INCDEC 208 %token T_SIZEOF 209 %token T_BUILTIN_OFFSETOF 210 %token T_TYPEOF 211 %token T_EXTENSION 212 %token T_ALIGNAS 213 %token T_ALIGNOF 214 %token T_ASTERISK 215 %token <y_op> T_MULTIPLICATIVE 216 %token <y_op> T_ADDITIVE 217 %token <y_op> T_SHIFT 218 %token <y_op> T_RELATIONAL 219 %token <y_op> T_EQUALITY 220 %token T_AMPER 221 %token T_BITXOR 222 %token T_BITOR 223 %token T_LOGAND 224 %token T_LOGOR 225 %token T_QUEST 226 %token T_COLON 227 %token T_ASSIGN 228 %token <y_op> T_OPASSIGN 229 %token T_COMMA 230 %token T_SEMI 231 %token T_ELLIPSIS 232 %token T_REAL 233 %token T_IMAG 234 %token T_GENERIC 235 236 /* storage classes (extern, static, auto, register and typedef) */ 237 %token <y_scl> T_SCLASS 238 %token <y_function_specifier> T_FUNCTION_SPECIFIER 239 240 /* 241 * predefined type keywords (char, int, short, long, unsigned, signed, 242 * float, double, void); see T_TYPENAME for types from typedef 243 */ 244 %token <y_tspec> T_TYPE 245 246 %token <y_type_qualifiers> T_QUAL 247 %token <y_type_qualifiers> T_ATOMIC 248 249 /* struct or union */ 250 %token <y_tspec> T_STRUCT_OR_UNION 251 252 /* remaining keywords */ 253 %token T_ASM 254 %token T_BREAK 255 %token T_CASE 256 %token T_CONTINUE 257 %token T_DEFAULT 258 %token T_DO 259 %token T_ELSE 260 %token T_ENUM 261 %token T_FOR 262 %token T_GOTO 263 %token T_IF 264 %token T_PACKED 265 %token T_RETURN 266 %token T_SWITCH 267 %token T_SYMBOLRENAME 268 %token T_WHILE 269 %token T_STATIC_ASSERT 270 271 %token T_ATTRIBUTE 272 273 %left T_THEN 274 %left T_ELSE 275 %right T_QUEST T_COLON 276 %left T_LOGOR 277 %left T_LOGAND 278 %left T_BITOR 279 %left T_BITXOR 280 %left T_AMPER 281 %left T_EQUALITY 282 %left T_RELATIONAL 283 %left T_SHIFT 284 %left T_ADDITIVE 285 %left T_ASTERISK T_MULTIPLICATIVE 286 287 %token <y_name> T_NAME 288 %token <y_name> T_TYPENAME 289 %token <y_val> T_CON 290 %token <y_string> T_STRING 291 292 /* No type for program. */ 293 %type <y_sym> identifier_sym 294 %type <y_name> identifier 295 %type <y_string> string 296 %type <y_tnode> primary_expression 297 %type <y_designation> member_designator 298 %type <y_tnode> generic_selection 299 %type <y_generic> generic_assoc_list 300 %type <y_generic> generic_association 301 %type <y_tnode> postfix_expression 302 %type <y_tnode> gcc_statement_expr_list 303 %type <y_tnode> gcc_statement_expr_item 304 %type <y_op> point_or_arrow 305 %type <y_arguments> argument_expression_list 306 %type <y_tnode> unary_expression 307 %type <y_tnode> cast_expression 308 %type <y_tnode> expression_opt 309 %type <y_tnode> conditional_expression 310 %type <y_tnode> assignment_expression 311 %type <y_tnode> expression 312 %type <y_tnode> constant_expression 313 /* No type for declaration_or_error. */ 314 /* No type for declaration. */ 315 /* No type for begin_type_declaration_specifiers. */ 316 /* No type for begin_type_declmods. */ 317 /* No type for begin_type_specifier_qualifier_list. */ 318 /* No type for begin_type_specifier_qualifier_list_postfix. */ 319 %type <y_type> begin_type_typespec 320 /* No type for begin_type_qualifier_list. */ 321 /* No type for declmod. */ 322 /* No type for type_attribute_list_opt. */ 323 /* No type for type_attribute_list. */ 324 /* No type for type_attribute_opt. */ 325 /* No type for type_attribute. */ 326 /* No type for begin_type. */ 327 /* No type for end_type. */ 328 %type <y_type> type_specifier 329 %type <y_type> notype_type_specifier 330 %type <y_type> atomic_type_specifier 331 %type <y_type> struct_or_union_specifier 332 %type <y_tspec> struct_or_union 333 %type <y_sym> braced_member_declaration_list 334 %type <y_sym> member_declaration_list_with_rbrace 335 %type <y_sym> member_declaration_list 336 %type <y_sym> member_declaration 337 %type <y_sym> notype_member_declarators 338 %type <y_sym> type_member_declarators 339 %type <y_sym> notype_member_declarator 340 %type <y_sym> type_member_declarator 341 %type <y_type> enum_specifier 342 /* No type for enum. */ 343 %type <y_sym> enum_declaration 344 %type <y_sym> enums_with_opt_comma 345 %type <y_sym> enumerator_list 346 %type <y_sym> enumerator 347 %type <y_type_qualifiers> type_qualifier 348 /* No type for atomic. */ 349 %type <y_qual_ptr> pointer 350 %type <y_type_qualifiers> type_qualifier_list_opt 351 %type <y_type_qualifiers> type_qualifier_list 352 /* No type for notype_init_declarators. */ 353 /* No type for type_init_declarators. */ 354 /* No type for notype_init_declarator. */ 355 /* No type for type_init_declarator. */ 356 %type <y_sym> notype_declarator 357 %type <y_sym> type_declarator 358 %type <y_sym> notype_direct_declarator 359 %type <y_sym> type_direct_declarator 360 %type <y_sym> type_param_declarator 361 %type <y_sym> notype_param_declarator 362 %type <y_sym> direct_param_declarator 363 %type <y_sym> direct_notype_param_declarator 364 %type <y_parameter_list> param_list 365 %type <y_array_size> array_size_opt 366 %type <y_sym> identifier_list 367 %type <y_type> type_name 368 %type <y_sym> abstract_declaration 369 %type <y_sym> abstract_declarator 370 %type <y_sym> direct_abstract_declarator 371 %type <y_parameter_list> abstract_decl_param_list 372 /* No type for abstract_decl_lparen. */ 373 %type <y_parameter_list> vararg_parameter_type_list 374 %type <y_parameter_list> parameter_type_list 375 %type <y_sym> parameter_declaration 376 /* No type for braced_initializer. */ 377 /* No type for initializer. */ 378 /* No type for initializer_list. */ 379 /* No type for designation. */ 380 /* No type for designator_list. */ 381 /* No type for designator. */ 382 /* No type for static_assert_declaration. */ 383 %type <y_range> range 384 /* No type for init_lbrace. */ 385 /* No type for init_rbrace. */ 386 %type <y_name> asm_or_symbolrename_opt 387 /* No type for statement. */ 388 /* No type for no_attr_statement. */ 389 /* No type for non_expr_statement. */ 390 /* No type for no_attr_non_expr_statement. */ 391 /* No type for labeled_statement. */ 392 /* No type for label. */ 393 /* No type for compound_statement. */ 394 /* No type for compound_statement_lbrace. */ 395 /* No type for compound_statement_rbrace. */ 396 %type <y_seen_statement> block_item_list 397 %type <y_seen_statement> block_item 398 /* No type for expression_statement. */ 399 /* No type for selection_statement. */ 400 /* No type for if_without_else. */ 401 /* No type for if_expr. */ 402 /* No type for switch_expr. */ 403 /* No type for iteration_statement. */ 404 /* No type for while_expr. */ 405 /* No type for do_statement. */ 406 /* No type for do. */ 407 /* No type for for_start. */ 408 /* No type for for_exprs. */ 409 /* No type for jump_statement. */ 410 /* No type for goto. */ 411 /* No type for asm_statement. */ 412 /* No type for read_until_rparen. */ 413 /* No type for translation_unit. */ 414 /* No type for external_declaration. */ 415 /* No type for top_level_declaration. */ 416 /* No type for function_definition. */ 417 %type <y_sym> func_declarator 418 /* No type for arg_declaration_list_opt. */ 419 /* No type for arg_declaration_list. */ 420 /* No type for arg_declaration. */ 421 /* No type for gcc_attribute_specifier_list_opt. */ 422 /* No type for gcc_attribute_specifier_list. */ 423 /* No type for gcc_attribute_specifier. */ 424 /* No type for gcc_attribute_list. */ 425 /* No type for gcc_attribute. */ 426 /* No type for gcc_attribute_parameters. */ 427 %type <y_in_system_header> sys 428 429 %% 430 431 program: 432 /* empty */ { 433 /* TODO: Make this an error in C99 mode as well. */ 434 if (!allow_trad && !allow_c99) 435 /* empty translation unit */ 436 error(272); 437 else if (allow_c90) 438 /* empty translation unit */ 439 warning(272); 440 } 441 | translation_unit 442 ; 443 444 identifier_sym: /* helper for struct/union/enum */ 445 identifier { 446 $$ = getsym($1); 447 } 448 ; 449 450 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 451 identifier: 452 T_NAME { 453 debug_step("cgram: name '%s'", $1->sb_name); 454 $$ = $1; 455 } 456 | T_TYPENAME { 457 debug_step("cgram: typename '%s'", $1->sb_name); 458 $$ = $1; 459 } 460 ; 461 462 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 463 string: 464 T_STRING 465 | string T_STRING { 466 if (!allow_c90) 467 /* concatenated strings are illegal in traditional C */ 468 warning(219); 469 $$ = cat_strings($1, $2); 470 } 471 ; 472 473 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 474 primary_expression: 475 T_NAME { 476 bool sys_name, sys_next; 477 sys_name = in_system_header; 478 if (yychar < 0) 479 yychar = yylex(); 480 sys_next = in_system_header; 481 in_system_header = sys_name; 482 $$ = build_name(getsym($1), yychar == T_LPAREN); 483 in_system_header = sys_next; 484 } 485 | T_CON { 486 $$ = build_constant(gettyp($1->v_tspec), $1); 487 } 488 | string { 489 $$ = build_string($1); 490 } 491 | T_LPAREN expression T_RPAREN { 492 if ($2 != NULL) 493 $2->tn_parenthesized = true; 494 $$ = $2; 495 } 496 | generic_selection 497 /* GCC primary-expression, see c_parser_postfix_expression */ 498 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 499 set_sym_kind(SK_MEMBER); 500 } member_designator T_RPAREN { 501 $$ = build_offsetof($3, $6); 502 } 503 ; 504 505 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 506 member_designator: 507 identifier { 508 $$ = (designation) { .dn_len = 0 }; 509 designation_push(&$$, DK_MEMBER, getsym($1), 0); 510 } 511 | member_designator T_LBRACK range T_RBRACK { 512 $$ = $1; 513 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 514 } 515 | member_designator T_POINT { 516 set_sym_kind(SK_MEMBER); 517 } identifier { 518 $$ = $1; 519 designation_push(&$$, DK_MEMBER, getsym($4), 0); 520 } 521 ; 522 523 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 524 generic_selection: 525 T_GENERIC T_LPAREN assignment_expression T_COMMA 526 generic_assoc_list T_RPAREN { 527 /* generic selection requires C11 or later */ 528 c11ism(345); 529 $$ = build_generic_selection($3, $5); 530 } 531 ; 532 533 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 534 generic_assoc_list: 535 generic_association 536 | generic_assoc_list T_COMMA generic_association { 537 $3->ga_prev = $1; 538 $$ = $3; 539 } 540 ; 541 542 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 543 generic_association: 544 type_name T_COLON assignment_expression { 545 $$ = block_zero_alloc(sizeof(*$$), "generic"); 546 $$->ga_arg = $1; 547 $$->ga_result = $3; 548 } 549 | T_DEFAULT T_COLON assignment_expression { 550 $$ = block_zero_alloc(sizeof(*$$), "generic"); 551 $$->ga_arg = NULL; 552 $$->ga_result = $3; 553 } 554 ; 555 556 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 557 postfix_expression: 558 primary_expression 559 | postfix_expression T_LBRACK sys expression T_RBRACK { 560 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 561 } 562 | postfix_expression T_LPAREN sys T_RPAREN { 563 function_call *call = 564 expr_zero_alloc(sizeof(*call), "function_call"); 565 $$ = build_function_call($1, $3, call); 566 } 567 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 568 $$ = build_function_call($1, $3, $4); 569 } 570 | postfix_expression point_or_arrow sys T_NAME { 571 $$ = build_member_access($1, $2, $3, $4); 572 } 573 | postfix_expression T_INCDEC sys { 574 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 575 } 576 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 577 sym_t *tmp = mktempsym($2); 578 begin_initialization(tmp); 579 cgram_declare(tmp, true, NULL); 580 } braced_initializer { 581 if (!allow_c99) 582 /* compound literals are a C99/GCC extension */ 583 gnuism(319); 584 $$ = build_name(current_initsym(), false); 585 end_initialization(); 586 } 587 | T_LPAREN compound_statement_lbrace { 588 begin_statement_expr(); 589 } gcc_statement_expr_list { 590 do_statement_expr($4); 591 } compound_statement_rbrace T_RPAREN { 592 $$ = end_statement_expr(); 593 } 594 ; 595 596 /* 597 * The inner part of a GCC statement-expression of the form ({ ... }). 598 * 599 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 600 */ 601 gcc_statement_expr_list: 602 gcc_statement_expr_item 603 | gcc_statement_expr_list gcc_statement_expr_item { 604 $$ = $2; 605 } 606 ; 607 608 gcc_statement_expr_item: 609 declaration_or_error { 610 clear_warning_flags(); 611 $$ = NULL; 612 } 613 | non_expr_statement { 614 $$ = expr_alloc_tnode(); 615 $$->tn_type = gettyp(VOID); 616 } 617 | T_SEMI { 618 $$ = expr_alloc_tnode(); 619 $$->tn_type = gettyp(VOID); 620 } 621 | expression T_SEMI { 622 if ($1 == NULL) { /* in case of syntax errors */ 623 $$ = expr_alloc_tnode(); 624 $$->tn_type = gettyp(VOID); 625 } else { 626 /* XXX: do that only on the last name */ 627 if ($1->tn_op == NAME) 628 $1->u.sym->s_used = true; 629 expr($1, false, false, false, false); 630 suppress_fallthrough = false; 631 $$ = $1; 632 } 633 } 634 ; 635 636 point_or_arrow: /* helper for 'postfix_expression' */ 637 T_POINT { 638 set_sym_kind(SK_MEMBER); 639 $$ = POINT; 640 } 641 | T_ARROW { 642 set_sym_kind(SK_MEMBER); 643 $$ = ARROW; 644 } 645 ; 646 647 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 648 argument_expression_list: 649 assignment_expression { 650 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 651 add_function_argument($$, $1); 652 } 653 | argument_expression_list T_COMMA assignment_expression { 654 add_function_argument($1, $3); 655 } 656 ; 657 658 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 659 unary_expression: 660 postfix_expression 661 | T_INCDEC sys unary_expression { 662 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 663 } 664 | T_AMPER sys cast_expression { 665 $$ = build_unary(ADDR, $2, $3); 666 } 667 | T_ASTERISK sys cast_expression { 668 $$ = build_unary(INDIR, $2, $3); 669 } 670 | T_ADDITIVE sys cast_expression { 671 if (!allow_c90 && $1 == PLUS) 672 /* unary '+' is illegal in traditional C */ 673 warning(100); 674 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 675 } 676 | T_COMPLEMENT sys cast_expression { 677 $$ = build_unary(COMPL, $2, $3); 678 } 679 | T_LOGNOT sys cast_expression { 680 $$ = build_unary(NOT, $2, $3); 681 } 682 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 683 $$ = build_unary(REAL, $2, $3); 684 } 685 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 686 $$ = build_unary(IMAG, $2, $3); 687 } 688 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 689 $$ = $2; 690 } 691 | T_SIZEOF unary_expression { 692 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 693 if ($$ != NULL) 694 check_expr_misc($2, 695 false, false, false, false, false, true); 696 } 697 | T_SIZEOF T_LPAREN type_name T_RPAREN { 698 $$ = build_sizeof($3); 699 } 700 | T_ALIGNOF unary_expression { 701 /* non type argument to alignof is a GCC extension */ 702 gnuism(349); 703 lint_assert($2 != NULL); 704 $$ = build_alignof($2->tn_type); 705 } 706 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 707 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 708 /* TODO: c11ism */ 709 $$ = build_alignof($3); 710 } 711 ; 712 713 /* The rule 'unary_operator' is inlined into unary_expression. */ 714 715 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 716 cast_expression: 717 unary_expression 718 | T_LPAREN type_name T_RPAREN sys cast_expression { 719 $$ = cast($5, $4, $2); 720 } 721 ; 722 723 expression_opt: 724 /* empty */ { 725 $$ = NULL; 726 } 727 | expression 728 ; 729 730 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 731 /* 'conditional_expression' also implements 'additive_expression'. */ 732 /* 'conditional_expression' also implements 'shift_expression'. */ 733 /* 'conditional_expression' also implements 'relational_expression'. */ 734 /* 'conditional_expression' also implements 'equality_expression'. */ 735 /* 'conditional_expression' also implements 'AND_expression'. */ 736 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 737 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 738 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 739 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 740 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 741 conditional_expression: 742 cast_expression 743 | conditional_expression T_ASTERISK sys conditional_expression { 744 $$ = build_binary($1, MULT, $3, $4); 745 } 746 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 747 $$ = build_binary($1, $2, $3, $4); 748 } 749 | conditional_expression T_ADDITIVE sys conditional_expression { 750 $$ = build_binary($1, $2, $3, $4); 751 } 752 | conditional_expression T_SHIFT sys conditional_expression { 753 $$ = build_binary($1, $2, $3, $4); 754 } 755 | conditional_expression T_RELATIONAL sys conditional_expression { 756 $$ = build_binary($1, $2, $3, $4); 757 } 758 | conditional_expression T_EQUALITY sys conditional_expression { 759 $$ = build_binary($1, $2, $3, $4); 760 } 761 | conditional_expression T_AMPER sys conditional_expression { 762 $$ = build_binary($1, BITAND, $3, $4); 763 } 764 | conditional_expression T_BITXOR sys conditional_expression { 765 $$ = build_binary($1, BITXOR, $3, $4); 766 } 767 | conditional_expression T_BITOR sys conditional_expression { 768 $$ = build_binary($1, BITOR, $3, $4); 769 } 770 | conditional_expression T_LOGAND sys conditional_expression { 771 $$ = build_binary($1, LOGAND, $3, $4); 772 } 773 | conditional_expression T_LOGOR sys conditional_expression { 774 $$ = build_binary($1, LOGOR, $3, $4); 775 } 776 | conditional_expression T_QUEST sys 777 expression T_COLON sys conditional_expression { 778 $$ = build_binary($1, QUEST, $3, 779 build_binary($4, COLON, $6, $7)); 780 } 781 ; 782 783 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 784 assignment_expression: 785 conditional_expression 786 | unary_expression T_ASSIGN sys assignment_expression { 787 $$ = build_binary($1, ASSIGN, $3, $4); 788 } 789 | unary_expression T_OPASSIGN sys assignment_expression { 790 $$ = build_binary($1, $2, $3, $4); 791 } 792 ; 793 794 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 795 expression: 796 assignment_expression 797 | expression T_COMMA sys assignment_expression { 798 $$ = build_binary($1, COMMA, $3, $4); 799 } 800 ; 801 802 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 803 constant_expression: 804 conditional_expression 805 ; 806 807 declaration_or_error: 808 declaration 809 | error T_SEMI 810 ; 811 812 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 813 declaration: 814 begin_type_declmods end_type T_SEMI { 815 if (dcs->d_scl == TYPEDEF) 816 /* typedef declares no type name */ 817 warning(72); 818 else 819 /* empty declaration */ 820 warning(2); 821 } 822 | begin_type_declmods end_type notype_init_declarators T_SEMI { 823 if (dcs->d_scl == TYPEDEF) 824 /* syntax error '%s' */ 825 error(249, "missing base type for typedef"); 826 else 827 /* old-style declaration; add 'int' */ 828 error(1); 829 } 830 | begin_type_declaration_specifiers end_type T_SEMI { 831 if (dcs->d_scl == TYPEDEF) 832 /* typedef declares no type name */ 833 warning(72); 834 else if (!dcs->d_nonempty_decl) 835 /* empty declaration */ 836 warning(2); 837 } 838 | begin_type_declaration_specifiers end_type 839 type_init_declarators T_SEMI 840 | static_assert_declaration 841 ; 842 843 begin_type_declaration_specifiers: /* see C99 6.7 */ 844 begin_type_typespec { 845 dcs_add_type($1); 846 } 847 | begin_type_declmods type_specifier { 848 dcs_add_type($2); 849 } 850 | type_attribute begin_type_declaration_specifiers 851 | begin_type_declaration_specifiers declmod 852 | begin_type_declaration_specifiers notype_type_specifier { 853 dcs_add_type($2); 854 } 855 ; 856 857 begin_type_declmods: /* see C99 6.7 */ 858 begin_type type_qualifier { 859 dcs_add_qualifiers($2); 860 } 861 | begin_type T_SCLASS { 862 dcs_add_storage_class($2); 863 } 864 | begin_type T_FUNCTION_SPECIFIER { 865 dcs_add_function_specifier($2); 866 } 867 | begin_type_declmods declmod 868 ; 869 870 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 871 begin_type_specifier_qualifier_list_postfix 872 | type_attribute_list begin_type_specifier_qualifier_list_postfix 873 ; 874 875 begin_type_specifier_qualifier_list_postfix: 876 begin_type_typespec { 877 dcs_add_type($1); 878 } 879 | begin_type_qualifier_list type_specifier { 880 dcs_add_type($2); 881 } 882 | begin_type_specifier_qualifier_list_postfix type_qualifier { 883 dcs_add_qualifiers($2); 884 } 885 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 886 dcs_add_type($2); 887 } 888 | begin_type_specifier_qualifier_list_postfix type_attribute 889 ; 890 891 begin_type_typespec: 892 begin_type notype_type_specifier { 893 $$ = $2; 894 } 895 | begin_type T_TYPENAME { 896 $$ = getsym($2)->s_type; 897 } 898 ; 899 900 begin_type_qualifier_list: 901 begin_type type_qualifier { 902 dcs_add_qualifiers($2); 903 } 904 | begin_type_qualifier_list type_qualifier { 905 dcs_add_qualifiers($2); 906 } 907 ; 908 909 declmod: 910 type_qualifier { 911 dcs_add_qualifiers($1); 912 } 913 | T_SCLASS { 914 dcs_add_storage_class($1); 915 } 916 | T_FUNCTION_SPECIFIER { 917 dcs_add_function_specifier($1); 918 } 919 | type_attribute_list 920 ; 921 922 type_attribute_list_opt: 923 /* empty */ 924 | type_attribute_list 925 ; 926 927 type_attribute_list: 928 type_attribute 929 | type_attribute_list type_attribute 930 ; 931 932 type_attribute_opt: 933 /* empty */ 934 | type_attribute 935 ; 936 937 type_attribute: /* See C11 6.7 declaration-specifiers */ 938 gcc_attribute_specifier 939 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 940 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 941 | T_PACKED { 942 dcs_add_packed(); 943 } 944 ; 945 946 begin_type: 947 /* empty */ { 948 dcs_begin_type(); 949 } 950 ; 951 952 end_type: 953 /* empty */ { 954 dcs_end_type(); 955 } 956 ; 957 958 type_specifier: /* C99 6.7.2 */ 959 notype_type_specifier 960 | T_TYPENAME { 961 $$ = getsym($1)->s_type; 962 } 963 ; 964 965 notype_type_specifier: /* see C99 6.7.2 */ 966 T_TYPE { 967 $$ = gettyp($1); 968 } 969 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 970 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 971 $$->t_typeof = true; 972 } 973 | atomic_type_specifier 974 | struct_or_union_specifier { 975 end_declaration_level(); 976 $$ = $1; 977 } 978 | enum_specifier { 979 end_declaration_level(); 980 $$ = $1; 981 } 982 ; 983 984 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 985 atomic_type_specifier: 986 atomic T_LPAREN type_name T_RPAREN { 987 $$ = $3; 988 } 989 ; 990 991 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 992 struct_or_union_specifier: 993 struct_or_union identifier_sym { 994 /* 995 * STDC requires that "struct a;" always introduces 996 * a new tag if "a" is not declared at current level 997 * 998 * yychar is valid because otherwise the parser would not 999 * have been able to decide if it must shift or reduce 1000 */ 1001 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1002 } 1003 | struct_or_union identifier_sym { 1004 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1005 } braced_member_declaration_list { 1006 $$ = complete_struct_or_union($4); 1007 } 1008 | struct_or_union { 1009 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1010 } braced_member_declaration_list { 1011 $$ = complete_struct_or_union($3); 1012 } 1013 | struct_or_union error { 1014 set_sym_kind(SK_VCFT); 1015 $$ = gettyp(INT); 1016 } 1017 ; 1018 1019 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1020 struct_or_union: 1021 T_STRUCT_OR_UNION { 1022 set_sym_kind(SK_TAG); 1023 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1024 dcs->d_sou_size_in_bits = 0; 1025 dcs->d_sou_align_in_bits = CHAR_SIZE; 1026 $$ = $1; 1027 } 1028 | struct_or_union type_attribute 1029 ; 1030 1031 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1032 T_LBRACE { 1033 set_sym_kind(SK_VCFT); 1034 } member_declaration_list_with_rbrace { 1035 $$ = $3; 1036 } 1037 ; 1038 1039 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1040 member_declaration_list T_RBRACE 1041 | T_RBRACE { 1042 /* XXX: Allowed since C23. */ 1043 $$ = NULL; 1044 } 1045 ; 1046 1047 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1048 /* Was named struct_declaration_list until C11. */ 1049 member_declaration_list: 1050 member_declaration 1051 | member_declaration_list member_declaration { 1052 $$ = concat_symbols($1, $2); 1053 } 1054 ; 1055 1056 /* Was named struct_declaration until C11. */ 1057 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1058 member_declaration: 1059 begin_type_qualifier_list end_type { 1060 /* ^^ There is no check for the missing type-specifier. */ 1061 /* too late, i know, but getsym() compensates it */ 1062 set_sym_kind(SK_MEMBER); 1063 } notype_member_declarators T_SEMI { 1064 set_sym_kind(SK_VCFT); 1065 $$ = $4; 1066 } 1067 | begin_type_specifier_qualifier_list end_type { 1068 set_sym_kind(SK_MEMBER); 1069 } type_member_declarators T_SEMI { 1070 set_sym_kind(SK_VCFT); 1071 $$ = $4; 1072 } 1073 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1074 /* syntax error '%s' */ 1075 error(249, "member without type"); 1076 $$ = NULL; 1077 } 1078 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1079 T_SEMI { 1080 set_sym_kind(SK_VCFT); 1081 if (!allow_c11 && !allow_gcc) 1082 /* anonymous struct/union members is a C11 feature */ 1083 warning(49); 1084 if (is_struct_or_union(dcs->d_type->t_tspec)) 1085 $$ = declare_unnamed_member(); 1086 else { 1087 /* syntax error '%s' */ 1088 error(249, "unnamed member"); 1089 $$ = NULL; 1090 } 1091 } 1092 | static_assert_declaration { 1093 $$ = NULL; 1094 } 1095 | error T_SEMI { 1096 set_sym_kind(SK_VCFT); 1097 $$ = NULL; 1098 } 1099 ; 1100 1101 /* Was named struct_declarators until C11. */ 1102 notype_member_declarators: 1103 notype_member_declarator { 1104 $$ = declare_member($1); 1105 } 1106 | notype_member_declarators { 1107 set_sym_kind(SK_MEMBER); 1108 } T_COMMA type_member_declarator { 1109 $$ = concat_symbols($1, declare_member($4)); 1110 } 1111 ; 1112 1113 /* Was named struct_declarators until C11. */ 1114 type_member_declarators: 1115 type_member_declarator { 1116 $$ = declare_member($1); 1117 } 1118 | type_member_declarators { 1119 set_sym_kind(SK_MEMBER); 1120 } T_COMMA type_member_declarator { 1121 $$ = concat_symbols($1, declare_member($4)); 1122 } 1123 ; 1124 1125 /* Was named struct_declarator until C11. */ 1126 notype_member_declarator: 1127 notype_declarator 1128 /* C99 6.7.2.1 */ 1129 | notype_declarator T_COLON constant_expression { 1130 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1131 } 1132 /* C99 6.7.2.1 */ 1133 | { 1134 set_sym_kind(SK_VCFT); 1135 } T_COLON constant_expression { 1136 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1137 } 1138 ; 1139 1140 /* Was named struct_declarator until C11. */ 1141 type_member_declarator: 1142 type_declarator 1143 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1144 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1145 } 1146 | { 1147 set_sym_kind(SK_VCFT); 1148 } T_COLON constant_expression type_attribute_list_opt { 1149 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1150 } 1151 ; 1152 1153 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1154 enum_specifier: 1155 enum gcc_attribute_specifier_list_opt identifier_sym { 1156 $$ = make_tag_type($3, ENUM, false, false); 1157 } 1158 | enum gcc_attribute_specifier_list_opt identifier_sym { 1159 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1160 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1161 $$ = complete_enum($5); 1162 } 1163 | enum gcc_attribute_specifier_list_opt { 1164 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1165 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1166 $$ = complete_enum($4); 1167 } 1168 | enum error { 1169 set_sym_kind(SK_VCFT); 1170 $$ = gettyp(INT); 1171 } 1172 ; 1173 1174 enum: /* helper for C99 6.7.2.2 */ 1175 T_ENUM { 1176 set_sym_kind(SK_TAG); 1177 begin_declaration_level(DLK_ENUM); 1178 } 1179 ; 1180 1181 enum_declaration: /* helper for C99 6.7.2.2 */ 1182 T_LBRACE { 1183 set_sym_kind(SK_VCFT); 1184 enumval = 0; 1185 } enums_with_opt_comma T_RBRACE { 1186 $$ = $3; 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 $$ = $1; 1200 } 1201 ; 1202 1203 enumerator_list: /* C99 6.7.2.2 */ 1204 enumerator 1205 | enumerator_list T_COMMA enumerator { 1206 $$ = concat_symbols($1, $3); 1207 } 1208 | error { 1209 $$ = NULL; 1210 } 1211 ; 1212 1213 enumerator: /* C99 6.7.2.2 */ 1214 identifier_sym gcc_attribute_specifier_list_opt { 1215 $$ = enumeration_constant($1, enumval, true); 1216 } 1217 | identifier_sym gcc_attribute_specifier_list_opt 1218 T_ASSIGN constant_expression { 1219 $$ = enumeration_constant($1, to_int_constant($4, true), 1220 false); 1221 } 1222 ; 1223 1224 type_qualifier: /* C99 6.7.3 */ 1225 T_QUAL 1226 | atomic { 1227 $$ = (type_qualifiers){ .tq_atomic = true }; 1228 } 1229 ; 1230 1231 atomic: /* helper */ 1232 T_ATOMIC { 1233 /* TODO: First fix c11ism, then use it here. */ 1234 if (!allow_c11) 1235 /* '_Atomic' requires C11 or later */ 1236 error(350); 1237 } 1238 ; 1239 1240 pointer: /* C99 6.7.5 */ 1241 T_ASTERISK type_qualifier_list_opt { 1242 $$ = xcalloc(1, sizeof(*$$)); 1243 add_type_qualifiers(&$$->qualifiers, $2); 1244 } 1245 | T_ASTERISK type_qualifier_list_opt pointer { 1246 $$ = xcalloc(1, sizeof(*$$)); 1247 add_type_qualifiers(&$$->qualifiers, $2); 1248 $$ = append_qualified_pointer($$, $3); 1249 } 1250 ; 1251 1252 type_qualifier_list_opt: /* see C99 6.7.5 */ 1253 /* empty */ { 1254 $$ = (type_qualifiers){ .tq_const = false }; 1255 } 1256 | type_qualifier_list 1257 ; 1258 1259 type_qualifier_list: /* C99 6.7.5 */ 1260 type_qualifier 1261 | type_qualifier_list type_qualifier { 1262 $$ = $1; 1263 add_type_qualifiers(&$$, $2); 1264 } 1265 ; 1266 1267 /* 1268 * For an explanation of 'notype' in the following rules, see 1269 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1270 */ 1271 1272 notype_init_declarators: 1273 notype_init_declarator 1274 | notype_init_declarators T_COMMA type_init_declarator 1275 ; 1276 1277 type_init_declarators: 1278 type_init_declarator 1279 | type_init_declarators T_COMMA type_init_declarator 1280 ; 1281 1282 notype_init_declarator: 1283 notype_declarator asm_or_symbolrename_opt { 1284 cgram_declare($1, false, $2); 1285 check_size($1); 1286 } 1287 | notype_declarator asm_or_symbolrename_opt { 1288 begin_initialization($1); 1289 cgram_declare($1, true, $2); 1290 } T_ASSIGN initializer { 1291 check_size($1); 1292 end_initialization(); 1293 } 1294 ; 1295 1296 type_init_declarator: 1297 type_declarator asm_or_symbolrename_opt { 1298 cgram_declare($1, false, $2); 1299 check_size($1); 1300 } 1301 | type_declarator asm_or_symbolrename_opt { 1302 begin_initialization($1); 1303 cgram_declare($1, true, $2); 1304 } T_ASSIGN initializer { 1305 check_size($1); 1306 end_initialization(); 1307 } 1308 ; 1309 1310 notype_declarator: 1311 notype_direct_declarator 1312 | pointer notype_direct_declarator { 1313 $$ = add_pointer($2, $1); 1314 } 1315 ; 1316 1317 type_declarator: 1318 type_direct_declarator 1319 | pointer type_direct_declarator { 1320 $$ = add_pointer($2, $1); 1321 } 1322 ; 1323 1324 notype_direct_declarator: 1325 type_attribute_list_opt T_NAME { 1326 $$ = declarator_name(getsym($2)); 1327 } 1328 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1329 $$ = $3; 1330 } 1331 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1332 $$ = add_array($1, $3.has_dim, $3.dim); 1333 } 1334 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1335 $$ = add_function(symbolrename($1, $3), $2); 1336 end_declaration_level(); 1337 block_level--; 1338 } 1339 | notype_direct_declarator type_attribute 1340 ; 1341 1342 type_direct_declarator: 1343 type_attribute_list_opt identifier { 1344 $$ = declarator_name(getsym($2)); 1345 } 1346 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1347 $$ = $3; 1348 } 1349 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1350 $$ = add_array($1, $3.has_dim, $3.dim); 1351 } 1352 | type_direct_declarator param_list asm_or_symbolrename_opt { 1353 $$ = add_function(symbolrename($1, $3), $2); 1354 end_declaration_level(); 1355 block_level--; 1356 } 1357 | type_direct_declarator type_attribute 1358 ; 1359 1360 /* 1361 * The two distinct rules type_param_declarator and notype_param_declarator 1362 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1363 * always treated as a typename, not an argument name. For example, after 1364 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1365 * "f(int (double));", not "f(int a);". 1366 */ 1367 type_param_declarator: 1368 direct_param_declarator 1369 | pointer direct_param_declarator { 1370 $$ = add_pointer($2, $1); 1371 } 1372 ; 1373 1374 notype_param_declarator: 1375 direct_notype_param_declarator 1376 | pointer direct_notype_param_declarator { 1377 $$ = add_pointer($2, $1); 1378 } 1379 ; 1380 1381 direct_param_declarator: 1382 identifier type_attribute_list { 1383 $$ = declarator_name(getsym($1)); 1384 } 1385 | identifier { 1386 $$ = declarator_name(getsym($1)); 1387 } 1388 | T_LPAREN notype_param_declarator T_RPAREN { 1389 $$ = $2; 1390 } 1391 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1392 gcc_attribute_specifier_list_opt { 1393 $$ = add_array($1, $3.has_dim, $3.dim); 1394 } 1395 | direct_param_declarator param_list asm_or_symbolrename_opt { 1396 $$ = add_function(symbolrename($1, $3), $2); 1397 end_declaration_level(); 1398 block_level--; 1399 } 1400 ; 1401 1402 direct_notype_param_declarator: 1403 identifier { 1404 $$ = declarator_name(getsym($1)); 1405 } 1406 | T_LPAREN notype_param_declarator T_RPAREN { 1407 $$ = $2; 1408 } 1409 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1410 $$ = add_array($1, $3.has_dim, $3.dim); 1411 } 1412 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1413 $$ = add_function(symbolrename($1, $3), $2); 1414 end_declaration_level(); 1415 block_level--; 1416 } 1417 ; 1418 1419 param_list: 1420 T_LPAREN { 1421 block_level++; 1422 begin_declaration_level(DLK_PROTO_PARAMS); 1423 } identifier_list T_RPAREN { 1424 $$ = (parameter_list){ .first = $3 }; 1425 } 1426 | abstract_decl_param_list 1427 ; 1428 1429 array_size_opt: 1430 /* empty */ { 1431 $$.has_dim = false; 1432 $$.dim = 0; 1433 } 1434 | T_ASTERISK { 1435 /* since C99; variable length array of unspecified size */ 1436 $$.has_dim = false; /* TODO: maybe change to true */ 1437 $$.dim = 0; /* just as a placeholder */ 1438 } 1439 | type_qualifier_list_opt T_SCLASS constant_expression { 1440 /* C11 6.7.6.3p7 */ 1441 if ($2 != STATIC) 1442 yyerror("Bad attribute"); 1443 /* static array size requires C11 or later */ 1444 c11ism(343); 1445 $$.has_dim = true; 1446 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1447 } 1448 | type_qualifier { 1449 /* C11 6.7.6.2 */ 1450 if (!$1.tq_restrict) 1451 yyerror("Bad attribute"); 1452 $$.has_dim = true; 1453 $$.dim = 0; 1454 } 1455 | constant_expression { 1456 $$.has_dim = true; 1457 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1458 } 1459 ; 1460 1461 identifier_list: /* C99 6.7.5 */ 1462 T_NAME { 1463 $$ = old_style_function_parameter_name(getsym($1)); 1464 } 1465 | identifier_list T_COMMA T_NAME { 1466 $$ = concat_symbols($1, 1467 old_style_function_parameter_name(getsym($3))); 1468 } 1469 | identifier_list error 1470 ; 1471 1472 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1473 type_name: /* C99 6.7.6 */ 1474 { 1475 begin_declaration_level(DLK_ABSTRACT); 1476 } abstract_declaration { 1477 end_declaration_level(); 1478 $$ = $2->s_type; 1479 } 1480 ; 1481 1482 abstract_declaration: /* specific to lint */ 1483 begin_type_qualifier_list end_type { 1484 $$ = declare_abstract_type(abstract_name()); 1485 } 1486 | begin_type_specifier_qualifier_list end_type { 1487 $$ = declare_abstract_type(abstract_name()); 1488 } 1489 | begin_type_qualifier_list end_type abstract_declarator { 1490 $$ = declare_abstract_type($3); 1491 } 1492 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1493 $$ = declare_abstract_type($3); 1494 } 1495 ; 1496 1497 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1498 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1499 abstract_declarator: 1500 pointer { 1501 $$ = add_pointer(abstract_name(), $1); 1502 } 1503 | direct_abstract_declarator 1504 | pointer direct_abstract_declarator { 1505 $$ = add_pointer($2, $1); 1506 } 1507 | type_attribute_list direct_abstract_declarator { 1508 $$ = $2; 1509 } 1510 | pointer type_attribute_list direct_abstract_declarator { 1511 $$ = add_pointer($3, $1); 1512 } 1513 ; 1514 1515 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1516 direct_abstract_declarator: 1517 /* TODO: sort rules according to C99 */ 1518 T_LPAREN abstract_declarator T_RPAREN { 1519 $$ = $2; 1520 } 1521 | T_LBRACK array_size_opt T_RBRACK { 1522 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1523 } 1524 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1525 $$ = add_array($1, $3.has_dim, $3.dim); 1526 } 1527 | abstract_decl_param_list asm_or_symbolrename_opt { 1528 sym_t *name = abstract_enclosing_name(); 1529 $$ = add_function(symbolrename(name, $2), $1); 1530 end_declaration_level(); 1531 block_level--; 1532 } 1533 | direct_abstract_declarator abstract_decl_param_list 1534 asm_or_symbolrename_opt { 1535 $$ = add_function(symbolrename($1, $3), $2); 1536 end_declaration_level(); 1537 block_level--; 1538 } 1539 | direct_abstract_declarator type_attribute_list 1540 ; 1541 1542 abstract_decl_param_list: /* specific to lint */ 1543 abstract_decl_lparen T_RPAREN type_attribute_opt { 1544 $$ = (parameter_list){ .first = NULL }; 1545 } 1546 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1547 type_attribute_opt { 1548 $$ = $2; 1549 $$.prototype = true; 1550 } 1551 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1552 $$ = (parameter_list){ .first = NULL }; 1553 } 1554 ; 1555 1556 abstract_decl_lparen: /* specific to lint */ 1557 T_LPAREN { 1558 block_level++; 1559 begin_declaration_level(DLK_PROTO_PARAMS); 1560 } 1561 ; 1562 1563 vararg_parameter_type_list: /* specific to lint */ 1564 parameter_type_list 1565 | parameter_type_list T_COMMA T_ELLIPSIS { 1566 $$ = $1; 1567 $$.vararg = true; 1568 } 1569 | T_ELLIPSIS { 1570 /* TODO: C99 6.7.5 makes this an error as well. */ 1571 if (!allow_trad && !allow_c99) 1572 /* C90 to C17 require formal parameter before '...' */ 1573 error(84); 1574 else if (allow_c90) 1575 /* C90 to C17 require formal parameter before '...' */ 1576 warning(84); 1577 $$ = (parameter_list){ .vararg = true }; 1578 } 1579 ; 1580 1581 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1582 parameter_type_list: 1583 parameter_declaration { 1584 $$ = (parameter_list){ .first = $1 }; 1585 } 1586 | parameter_type_list T_COMMA parameter_declaration { 1587 $$ = $1; 1588 $$.first = concat_symbols($1.first, $3); 1589 } 1590 ; 1591 1592 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1593 parameter_declaration: 1594 begin_type_declmods end_type { 1595 /* ^^ There is no check for the missing type-specifier. */ 1596 $$ = declare_parameter(abstract_name(), false); 1597 } 1598 | begin_type_declaration_specifiers end_type { 1599 $$ = declare_parameter(abstract_name(), false); 1600 } 1601 | begin_type_declmods end_type notype_param_declarator { 1602 /* ^^ There is no check for the missing type-specifier. */ 1603 $$ = declare_parameter($3, false); 1604 } 1605 /* 1606 * type_param_declarator is needed because of following conflict: 1607 * "typedef int a; f(int (a));" could be parsed as 1608 * "function with argument a of type int", or 1609 * "function with an unnamed (abstract) argument of type function". 1610 * This grammar realizes the second case. 1611 */ 1612 | begin_type_declaration_specifiers end_type type_param_declarator { 1613 $$ = declare_parameter($3, false); 1614 } 1615 | begin_type_declmods end_type abstract_declarator { 1616 /* ^^ There is no check for the missing type-specifier. */ 1617 $$ = declare_parameter($3, false); 1618 } 1619 | begin_type_declaration_specifiers end_type abstract_declarator { 1620 $$ = declare_parameter($3, false); 1621 } 1622 ; 1623 1624 braced_initializer: 1625 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1626 init_lbrace init_rbrace { 1627 /* empty initializer braces require C23 or later */ 1628 c23ism(353); 1629 } 1630 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1631 | init_lbrace initializer_list init_rbrace 1632 | init_lbrace initializer_list T_COMMA init_rbrace 1633 ; 1634 1635 initializer: /* C99 6.7.8 "Initialization" */ 1636 assignment_expression { 1637 init_expr($1); 1638 } 1639 | init_lbrace init_rbrace { 1640 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1641 } 1642 | init_lbrace initializer_list init_rbrace 1643 | init_lbrace initializer_list T_COMMA init_rbrace 1644 /* XXX: What is this error handling for? */ 1645 | error 1646 ; 1647 1648 initializer_list: /* C99 6.7.8 "Initialization" */ 1649 initializer 1650 | designation initializer 1651 | initializer_list T_COMMA initializer 1652 | initializer_list T_COMMA designation initializer 1653 ; 1654 1655 designation: /* C99 6.7.8 "Initialization" */ 1656 { 1657 begin_designation(); 1658 } designator_list T_ASSIGN 1659 | identifier T_COLON { 1660 /* GCC style struct or union member name in initializer */ 1661 gnuism(315); 1662 begin_designation(); 1663 add_designator_member($1); 1664 } 1665 ; 1666 1667 designator_list: /* C99 6.7.8 "Initialization" */ 1668 designator 1669 | designator_list designator 1670 ; 1671 1672 designator: /* C99 6.7.8 "Initialization" */ 1673 T_LBRACK range T_RBRACK { 1674 if (!allow_c99) 1675 /* array initializer with designators is a C99 ... */ 1676 warning(321); 1677 add_designator_subscript($2); 1678 } 1679 | T_POINT identifier { 1680 if (!allow_c99) 1681 /* struct or union member name in initializer is ... */ 1682 warning(313); 1683 add_designator_member($2); 1684 } 1685 ; 1686 1687 static_assert_declaration: 1688 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1689 T_RPAREN T_SEMI { 1690 /* '_Static_assert' requires C11 or later */ 1691 c11ism(354); 1692 } 1693 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1694 /* '_Static_assert' without message requires C23 or later */ 1695 c23ism(355); 1696 } 1697 ; 1698 1699 range: 1700 constant_expression { 1701 $$.lo = to_int_constant($1, true); 1702 $$.hi = $$.lo; 1703 } 1704 | constant_expression T_ELLIPSIS constant_expression { 1705 $$.lo = to_int_constant($1, true); 1706 $$.hi = to_int_constant($3, true); 1707 /* initialization with '[a...b]' is a GCC extension */ 1708 gnuism(340); 1709 } 1710 ; 1711 1712 init_lbrace: /* helper */ 1713 T_LBRACE { 1714 init_lbrace(); 1715 } 1716 ; 1717 1718 init_rbrace: /* helper */ 1719 T_RBRACE { 1720 init_rbrace(); 1721 } 1722 ; 1723 1724 asm_or_symbolrename_opt: /* GCC extensions */ 1725 /* empty */ { 1726 $$ = NULL; 1727 } 1728 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1729 freeyyv(&$3, T_STRING); 1730 $$ = NULL; 1731 } 1732 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1733 gcc_attribute_specifier_list_opt { 1734 $$ = $3; 1735 } 1736 ; 1737 1738 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1739 statement: 1740 expression_statement 1741 | non_expr_statement 1742 ; 1743 1744 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1745 no_attr_statement: 1746 expression_statement 1747 | no_attr_non_expr_statement 1748 ; 1749 1750 non_expr_statement: /* helper for C99 6.8 */ 1751 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1752 | no_attr_non_expr_statement 1753 ; 1754 1755 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1756 no_attr_non_expr_statement: 1757 labeled_statement 1758 | compound_statement 1759 | selection_statement 1760 | iteration_statement 1761 | jump_statement { 1762 suppress_fallthrough = false; 1763 } 1764 | asm_statement 1765 ; 1766 1767 labeled_statement: /* C99 6.8.1 */ 1768 label gcc_attribute_specifier_list_opt no_attr_statement 1769 ; 1770 1771 label: 1772 T_NAME T_COLON { 1773 set_sym_kind(SK_LABEL); 1774 named_label(getsym($1)); 1775 } 1776 | T_CASE constant_expression T_COLON { 1777 case_label($2); 1778 suppress_fallthrough = true; 1779 } 1780 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1781 /* XXX: We don't fill all cases */ 1782 case_label($2); 1783 suppress_fallthrough = true; 1784 } 1785 | T_DEFAULT T_COLON { 1786 default_label(); 1787 suppress_fallthrough = true; 1788 } 1789 ; 1790 1791 compound_statement: /* C99 6.8.2 */ 1792 compound_statement_lbrace compound_statement_rbrace 1793 | compound_statement_lbrace block_item_list compound_statement_rbrace 1794 ; 1795 1796 compound_statement_lbrace: 1797 T_LBRACE { 1798 block_level++; 1799 mem_block_level++; 1800 debug_step("%s: mem_block_level = %zu", 1801 "compound_statement_lbrace", mem_block_level); 1802 begin_declaration_level(DLK_AUTO); 1803 } 1804 ; 1805 1806 compound_statement_rbrace: 1807 T_RBRACE { 1808 end_declaration_level(); 1809 if (!in_statement_expr()) 1810 level_free_all(mem_block_level); /* leak */ 1811 mem_block_level--; 1812 debug_step("%s: mem_block_level = %zu", 1813 "compound_statement_rbrace", mem_block_level); 1814 block_level--; 1815 suppress_fallthrough = false; 1816 } 1817 ; 1818 1819 block_item_list: /* C99 6.8.2 */ 1820 block_item 1821 | block_item_list block_item { 1822 if ($1 && !$2) 1823 /* declarations after statements is a C99 feature */ 1824 c99ism(327); 1825 $$ = $1 || $2; 1826 } 1827 ; 1828 1829 block_item: /* C99 6.8.2 */ 1830 declaration_or_error { 1831 $$ = false; 1832 restore_warning_flags(); 1833 } 1834 | statement { 1835 $$ = true; 1836 restore_warning_flags(); 1837 } 1838 ; 1839 1840 expression_statement: /* C99 6.8.3 */ 1841 expression T_SEMI { 1842 expr($1, false, false, false, false); 1843 suppress_fallthrough = false; 1844 } 1845 | T_SEMI { 1846 check_statement_reachable(); 1847 suppress_fallthrough = false; 1848 } 1849 ; 1850 1851 selection_statement: /* C99 6.8.4 */ 1852 if_without_else %prec T_THEN { 1853 save_warning_flags(); 1854 stmt_if_then_stmt(); 1855 stmt_if_else_stmt(false); 1856 } 1857 | if_without_else T_ELSE { 1858 save_warning_flags(); 1859 stmt_if_then_stmt(); 1860 } statement { 1861 clear_warning_flags(); 1862 stmt_if_else_stmt(true); 1863 } 1864 | if_without_else T_ELSE error { 1865 clear_warning_flags(); 1866 stmt_if_else_stmt(false); 1867 } 1868 | switch_expr statement { 1869 clear_warning_flags(); 1870 stmt_switch_expr_stmt(); 1871 } 1872 | switch_expr error { 1873 clear_warning_flags(); 1874 stmt_switch_expr_stmt(); 1875 } 1876 ; 1877 1878 if_without_else: /* see C99 6.8.4 */ 1879 if_expr statement 1880 | if_expr error 1881 ; 1882 1883 if_expr: /* see C99 6.8.4 */ 1884 T_IF T_LPAREN expression T_RPAREN { 1885 stmt_if_expr($3); 1886 clear_warning_flags(); 1887 } 1888 ; 1889 1890 switch_expr: /* see C99 6.8.4 */ 1891 T_SWITCH T_LPAREN expression T_RPAREN { 1892 stmt_switch_expr($3); 1893 clear_warning_flags(); 1894 } 1895 ; 1896 1897 iteration_statement: /* C99 6.8.5 */ 1898 while_expr statement { 1899 clear_warning_flags(); 1900 stmt_while_expr_stmt(); 1901 } 1902 | while_expr error { 1903 clear_warning_flags(); 1904 stmt_while_expr_stmt(); 1905 } 1906 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1907 stmt_do_while_expr($4); 1908 suppress_fallthrough = false; 1909 } 1910 | do error { 1911 clear_warning_flags(); 1912 stmt_do_while_expr(NULL); 1913 } 1914 | for_exprs statement { 1915 clear_warning_flags(); 1916 stmt_for_exprs_stmt(); 1917 end_declaration_level(); 1918 block_level--; 1919 } 1920 | for_exprs error { 1921 clear_warning_flags(); 1922 stmt_for_exprs_stmt(); 1923 end_declaration_level(); 1924 block_level--; 1925 } 1926 ; 1927 1928 while_expr: /* see C99 6.8.5 */ 1929 T_WHILE T_LPAREN expression T_RPAREN { 1930 stmt_while_expr($3); 1931 clear_warning_flags(); 1932 } 1933 ; 1934 1935 do_statement: /* see C99 6.8.5 */ 1936 do statement { 1937 clear_warning_flags(); 1938 } 1939 ; 1940 1941 do: /* see C99 6.8.5 */ 1942 T_DO { 1943 stmt_do(); 1944 } 1945 ; 1946 1947 for_start: /* see C99 6.8.5 */ 1948 T_FOR T_LPAREN { 1949 begin_declaration_level(DLK_AUTO); 1950 block_level++; 1951 } 1952 ; 1953 1954 for_exprs: /* see C99 6.8.5 */ 1955 for_start 1956 begin_type_declaration_specifiers end_type 1957 notype_init_declarators T_SEMI 1958 expression_opt T_SEMI 1959 expression_opt T_RPAREN { 1960 /* variable declaration in for loop */ 1961 c99ism(325); 1962 stmt_for_exprs(NULL, $6, $8); 1963 clear_warning_flags(); 1964 } 1965 | for_start 1966 expression_opt T_SEMI 1967 expression_opt T_SEMI 1968 expression_opt T_RPAREN { 1969 stmt_for_exprs($2, $4, $6); 1970 clear_warning_flags(); 1971 } 1972 ; 1973 1974 jump_statement: /* C99 6.8.6 */ 1975 goto identifier T_SEMI { 1976 stmt_goto(getsym($2)); 1977 } 1978 | goto error T_SEMI { 1979 set_sym_kind(SK_VCFT); 1980 } 1981 | T_CONTINUE T_SEMI { 1982 stmt_continue(); 1983 } 1984 | T_BREAK T_SEMI { 1985 stmt_break(); 1986 } 1987 | T_RETURN sys T_SEMI { 1988 stmt_return($2, NULL); 1989 } 1990 | T_RETURN sys expression T_SEMI { 1991 stmt_return($2, $3); 1992 } 1993 ; 1994 1995 goto: /* see C99 6.8.6 */ 1996 T_GOTO { 1997 set_sym_kind(SK_LABEL); 1998 } 1999 ; 2000 2001 asm_statement: /* GCC extension */ 2002 T_ASM T_LPAREN read_until_rparen T_SEMI { 2003 dcs_set_asm(); 2004 } 2005 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2006 dcs_set_asm(); 2007 } 2008 | T_ASM error 2009 ; 2010 2011 read_until_rparen: /* helper for 'asm_statement' */ 2012 /* empty */ { 2013 read_until_rparen(); 2014 } 2015 ; 2016 2017 translation_unit: /* C99 6.9 */ 2018 external_declaration 2019 | translation_unit external_declaration 2020 ; 2021 2022 external_declaration: /* C99 6.9 */ 2023 function_definition { 2024 global_clean_up_decl(false); 2025 clear_warning_flags(); 2026 } 2027 | top_level_declaration { 2028 global_clean_up_decl(false); 2029 clear_warning_flags(); 2030 } 2031 | asm_statement /* GCC extension */ 2032 | T_SEMI { /* GCC extension */ 2033 /* 2034 * TODO: Only allow this in GCC mode, not in plain C99. 2035 * This is one of the top 10 warnings in the NetBSD build. 2036 */ 2037 if (!allow_trad && !allow_c99) 2038 /* empty declaration */ 2039 error(0); 2040 else if (allow_c90) 2041 /* empty declaration */ 2042 warning(0); 2043 } 2044 ; 2045 2046 /* 2047 * On the top level, lint allows several forms of declarations that it doesn't 2048 * allow in functions. For example, a single ';' is an empty declaration and 2049 * is supported by some compilers, but in a function it would be an empty 2050 * statement, not a declaration. This makes a difference in C90 mode, where 2051 * a statement must not be followed by a declaration. 2052 * 2053 * See 'declaration' for all other declarations. 2054 */ 2055 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2056 begin_type end_type notype_init_declarators T_SEMI { 2057 /* TODO: Make this an error in C99 mode as well. */ 2058 if (!allow_trad && !allow_c99) 2059 /* old-style declaration; add 'int' */ 2060 error(1); 2061 else if (allow_c90) 2062 /* old-style declaration; add 'int' */ 2063 warning(1); 2064 } 2065 | declaration 2066 | error T_SEMI { 2067 global_clean_up(); 2068 } 2069 | error T_RBRACE { 2070 global_clean_up(); 2071 } 2072 ; 2073 2074 function_definition: /* C99 6.9.1 */ 2075 func_declarator { 2076 if ($1->s_type->t_tspec != FUNC) { 2077 /* syntax error '%s' */ 2078 error(249, yytext); 2079 YYERROR; 2080 } 2081 if ($1->s_type->t_typedef) { 2082 /* ()-less function definition */ 2083 error(64); 2084 YYERROR; 2085 } 2086 check_extern_declaration($1); 2087 begin_function($1); 2088 block_level++; 2089 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2090 if (lwarn == LWARN_NONE) 2091 $1->s_used = true; 2092 } arg_declaration_list_opt { 2093 end_declaration_level(); 2094 block_level--; 2095 check_func_lint_directives(); 2096 check_func_old_style_parameters(); 2097 begin_control_statement(CS_FUNCTION_BODY); 2098 } compound_statement { 2099 end_function(); 2100 end_control_statement(CS_FUNCTION_BODY); 2101 } 2102 ; 2103 2104 func_declarator: 2105 begin_type end_type notype_declarator { 2106 if (!allow_trad) 2107 /* old-style declaration; add 'int' */ 2108 error(1); 2109 $$ = $3; 2110 } 2111 | begin_type_declmods end_type notype_declarator { 2112 if (!allow_trad) 2113 /* old-style declaration; add 'int' */ 2114 error(1); 2115 $$ = $3; 2116 } 2117 | begin_type_declaration_specifiers end_type type_declarator { 2118 $$ = $3; 2119 } 2120 ; 2121 2122 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2123 /* empty */ 2124 | arg_declaration_list 2125 ; 2126 2127 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2128 arg_declaration 2129 | arg_declaration_list arg_declaration 2130 /* XXX or better "arg_declaration error" ? */ 2131 | error 2132 ; 2133 2134 /* 2135 * "arg_declaration" is separated from "declaration" because it 2136 * needs other error handling. 2137 */ 2138 arg_declaration: 2139 begin_type_declmods end_type T_SEMI { 2140 /* empty declaration */ 2141 warning(2); 2142 } 2143 | begin_type_declmods end_type notype_init_declarators T_SEMI 2144 | begin_type_declaration_specifiers end_type T_SEMI { 2145 if (!dcs->d_nonempty_decl) 2146 /* empty declaration */ 2147 warning(2); 2148 else 2149 /* '%s' declared in parameter declaration list */ 2150 warning(3, type_name(dcs->d_type)); 2151 } 2152 | begin_type_declaration_specifiers end_type 2153 type_init_declarators T_SEMI { 2154 if (dcs->d_nonempty_decl) 2155 /* '%s' declared in parameter declaration list */ 2156 warning(3, type_name(dcs->d_type)); 2157 } 2158 | begin_type_declmods error 2159 | begin_type_declaration_specifiers error 2160 ; 2161 2162 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2163 gcc_attribute_specifier_list_opt: 2164 /* empty */ 2165 | gcc_attribute_specifier_list 2166 ; 2167 2168 gcc_attribute_specifier_list: 2169 gcc_attribute_specifier 2170 | gcc_attribute_specifier_list gcc_attribute_specifier 2171 ; 2172 2173 gcc_attribute_specifier: 2174 T_ATTRIBUTE T_LPAREN T_LPAREN { 2175 in_gcc_attribute = true; 2176 } gcc_attribute_list { 2177 in_gcc_attribute = false; 2178 } T_RPAREN T_RPAREN 2179 ; 2180 2181 gcc_attribute_list: 2182 gcc_attribute 2183 | gcc_attribute_list T_COMMA gcc_attribute 2184 ; 2185 2186 gcc_attribute: 2187 /* empty */ 2188 | T_NAME { 2189 const char *name = $1->sb_name; 2190 if (is_either(name, "packed", "__packed__")) 2191 dcs_add_packed(); 2192 else if (is_either(name, "used", "__used__") || 2193 is_either(name, "unused", "__unused__")) 2194 dcs_set_used(); 2195 else if (is_either(name, "fallthrough", "__fallthrough__")) 2196 suppress_fallthrough = true; 2197 } 2198 | T_NAME T_LPAREN T_RPAREN 2199 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2200 | type_qualifier { 2201 if (!$1.tq_const) 2202 yyerror("Bad attribute"); 2203 } 2204 ; 2205 2206 gcc_attribute_parameters: 2207 constant_expression 2208 | gcc_attribute_parameters T_COMMA constant_expression 2209 ; 2210 2211 sys: 2212 /* empty */ { 2213 $$ = in_system_header; 2214 } 2215 ; 2216 2217 %% 2218 2219 /* ARGSUSED */ 2220 int 2221 yyerror(const char *msg) 2222 { 2223 /* syntax error '%s' */ 2224 error(249, yytext); 2225 if (++sytxerr >= 5) 2226 norecover(); 2227 return 0; 2228 } 2229 2230 #if YYDEBUG && YYBYACC 2231 static const char * 2232 cgram_to_string(int token, YYSTYPE val) 2233 { 2234 2235 switch (token) { 2236 case T_INCDEC: 2237 return val.y_inc ? "++" : "--"; 2238 case T_MULTIPLICATIVE: 2239 case T_ADDITIVE: 2240 case T_SHIFT: 2241 case T_RELATIONAL: 2242 case T_EQUALITY: 2243 case T_OPASSIGN: 2244 return op_name(val.y_op); 2245 case T_SCLASS: 2246 return scl_name(val.y_scl); 2247 case T_TYPE: 2248 case T_STRUCT_OR_UNION: 2249 return tspec_name(val.y_tspec); 2250 case T_QUAL: 2251 return type_qualifiers_string(val.y_type_qualifiers); 2252 case T_FUNCTION_SPECIFIER: 2253 return function_specifier_name(val.y_function_specifier); 2254 case T_NAME: 2255 return val.y_name->sb_name; 2256 default: 2257 return "<none>"; 2258 } 2259 } 2260 #endif 2261 2262 static void 2263 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2264 { 2265 declare(decl, has_initializer, renaming); 2266 if (renaming != NULL) 2267 freeyyv(&renaming, T_NAME); 2268 } 2269 2270 /* 2271 * Discard all input tokens up to and including the next unmatched right 2272 * parenthesis. 2273 */ 2274 static void 2275 read_until_rparen(void) 2276 { 2277 int level; 2278 2279 if (yychar < 0) 2280 yychar = yylex(); 2281 freeyyv(&yylval, yychar); 2282 2283 level = 1; 2284 while (yychar > 0) { 2285 if (yychar == T_LPAREN) 2286 level++; 2287 if (yychar == T_RPAREN && --level == 0) 2288 break; 2289 freeyyv(&yylval, yychar = yylex()); 2290 } 2291 2292 yyclearin; 2293 } 2294 2295 static sym_t * 2296 symbolrename(sym_t *s, sbuf_t *sb) 2297 { 2298 if (sb != NULL) 2299 s->s_rename = sb->sb_name; 2300 return s; 2301 } 2302
Indexes created Tue Oct 07 21:09:53 GMT 2025