cgram.y revision 1.483
1 %{ 2 /* $NetBSD: cgram.y,v 1.483 2024/01/13 11:24:57 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 1.483 2024/01/13 11:24:57 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of parameters in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 /* 89 * There used to be an assertion that saved_lwarn is 90 * LWARN_NOTHING_SAVED here, but that triggered for the following 91 * code: 92 * 93 * void function(int x) { if (x > 0) if (x > 1) return; } 94 * 95 * It didn't trigger if the inner 'if' was enclosed in braces though. 96 * 97 * TODO: If actually needed, add support for nested suppression of 98 * warnings. 99 */ 100 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 101 saved_lwarn = lwarn; 102 } 103 104 /* ARGSUSED */ 105 static void 106 restore_warning_flags_loc(const char *file, size_t line) 107 { 108 if (saved_lwarn != LWARN_NOTHING_SAVED) { 109 lwarn = saved_lwarn; 110 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 111 /* 112 * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to 113 * avoid triggering the assertion in save_warning_flags_loc. 114 */ 115 } else 116 clear_warning_flags_loc(file, line); 117 } 118 119 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 120 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 121 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 122 123 static bool 124 is_either(const char *s, const char *a, const char *b) 125 { 126 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 127 } 128 129 #if YYDEBUG && YYBYACC 130 #define YYSTYPE_TOSTRING cgram_to_string 131 #endif 132 133 %} 134 135 %expect 103 136 137 %union { 138 val_t *y_val; 139 sbuf_t *y_name; 140 sym_t *y_sym; 141 bool y_inc; 142 op_t y_op; 143 scl_t y_scl; 144 tspec_t y_tspec; 145 type_qualifiers y_type_qualifiers; 146 function_specifier y_function_specifier; 147 struct parameter_list y_parameter_list; 148 type_t *y_type; 149 tnode_t *y_tnode; 150 range_t y_range; 151 strg_t *y_string; 152 qual_ptr *y_qual_ptr; 153 bool y_seen_statement; 154 struct generic_association *y_generic; 155 struct array_size y_array_size; 156 bool y_in_system_header; 157 designation y_designation; 158 }; 159 160 /* for Bison: 161 %printer { 162 if (is_integer($$->v_tspec)) 163 fprintf(yyo, "%lld", (long long)$$->u.integer); 164 else 165 fprintf(yyo, "%Lg", $$->u.floating); 166 } <y_val> 167 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 168 %printer { 169 bool indented = debug_push_indented(true); 170 debug_sym("", $$, ""); 171 debug_pop_indented(indented); 172 } <y_sym> 173 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 174 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 175 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 176 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 177 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 178 %printer { 179 fprintf(yyo, "%s", function_specifier_name($$)); 180 } <y_function_specifier> 181 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 182 %printer { 183 if ($$ == NULL) 184 fprintf(yyo, "<null>"); 185 else 186 fprintf(yyo, "%s '%s'", 187 op_name($$->tn_op), type_name($$->tn_type)); 188 } <y_tnode> 189 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 190 %printer { fprintf(yyo, "length %zu", $$->st_len); } <y_string> 191 %printer { 192 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 193 } <y_qual_ptr> 194 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 195 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 196 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 197 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 198 */ 199 200 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 201 %token T_POINT T_ARROW 202 %token T_COMPLEMENT T_LOGNOT 203 %token <y_inc> T_INCDEC 204 %token T_SIZEOF 205 %token T_BUILTIN_OFFSETOF 206 %token T_TYPEOF 207 %token T_EXTENSION 208 %token T_ALIGNAS 209 %token T_ALIGNOF 210 %token T_ASTERISK 211 %token <y_op> T_MULTIPLICATIVE 212 %token <y_op> T_ADDITIVE 213 %token <y_op> T_SHIFT 214 %token <y_op> T_RELATIONAL 215 %token <y_op> T_EQUALITY 216 %token T_AMPER 217 %token T_BITXOR 218 %token T_BITOR 219 %token T_LOGAND 220 %token T_LOGOR 221 %token T_QUEST 222 %token T_COLON 223 %token T_ASSIGN 224 %token <y_op> T_OPASSIGN 225 %token T_COMMA 226 %token T_SEMI 227 %token T_ELLIPSIS 228 %token T_REAL 229 %token T_IMAG 230 %token T_GENERIC 231 232 /* storage classes (extern, static, auto, register and typedef) */ 233 %token <y_scl> T_SCLASS 234 %token <y_function_specifier> T_FUNCTION_SPECIFIER 235 236 /* 237 * predefined type keywords (char, int, short, long, unsigned, signed, 238 * float, double, void); see T_TYPENAME for types from typedef 239 */ 240 %token <y_tspec> T_TYPE 241 242 %token <y_type_qualifiers> T_QUAL 243 %token <y_type_qualifiers> T_ATOMIC 244 245 /* struct or union */ 246 %token <y_tspec> T_STRUCT_OR_UNION 247 248 /* remaining keywords */ 249 %token T_ASM 250 %token T_BREAK 251 %token T_CASE 252 %token T_CONTINUE 253 %token T_DEFAULT 254 %token T_DO 255 %token T_ELSE 256 %token T_ENUM 257 %token T_FOR 258 %token T_GOTO 259 %token T_IF 260 %token T_PACKED 261 %token T_RETURN 262 %token T_SWITCH 263 %token T_SYMBOLRENAME 264 %token T_WHILE 265 %token T_STATIC_ASSERT 266 267 %token T_ATTRIBUTE 268 269 %left T_THEN 270 %left T_ELSE 271 %right T_QUEST T_COLON 272 %left T_LOGOR 273 %left T_LOGAND 274 %left T_BITOR 275 %left T_BITXOR 276 %left T_AMPER 277 %left T_EQUALITY 278 %left T_RELATIONAL 279 %left T_SHIFT 280 %left T_ADDITIVE 281 %left T_ASTERISK T_MULTIPLICATIVE 282 283 %token <y_name> T_NAME 284 %token <y_name> T_TYPENAME 285 %token <y_val> T_CON 286 %token <y_string> T_STRING 287 288 /* No type for program. */ 289 %type <y_sym> identifier_sym 290 %type <y_name> identifier 291 %type <y_string> string 292 %type <y_tnode> primary_expression 293 %type <y_designation> member_designator 294 %type <y_tnode> generic_selection 295 %type <y_generic> generic_assoc_list 296 %type <y_generic> generic_association 297 %type <y_tnode> postfix_expression 298 %type <y_tnode> gcc_statement_expr_list 299 %type <y_tnode> gcc_statement_expr_item 300 %type <y_op> point_or_arrow 301 %type <y_tnode> argument_expression_list 302 %type <y_tnode> unary_expression 303 %type <y_tnode> cast_expression 304 %type <y_tnode> expression_opt 305 %type <y_tnode> conditional_expression 306 %type <y_tnode> assignment_expression 307 %type <y_tnode> expression 308 %type <y_tnode> constant_expression 309 /* No type for declaration_or_error. */ 310 /* No type for declaration. */ 311 /* No type for begin_type_declaration_specifiers. */ 312 /* No type for begin_type_declmods. */ 313 /* No type for begin_type_specifier_qualifier_list. */ 314 /* No type for begin_type_specifier_qualifier_list_postfix. */ 315 %type <y_type> begin_type_typespec 316 /* No type for begin_type_qualifier_list. */ 317 /* No type for declmod. */ 318 /* No type for type_attribute_list_opt. */ 319 /* No type for type_attribute_list. */ 320 /* No type for type_attribute_opt. */ 321 /* No type for type_attribute. */ 322 /* No type for begin_type. */ 323 /* No type for end_type. */ 324 %type <y_type> type_specifier 325 %type <y_type> notype_type_specifier 326 %type <y_type> atomic_type_specifier 327 %type <y_type> struct_or_union_specifier 328 %type <y_tspec> struct_or_union 329 %type <y_sym> braced_member_declaration_list 330 %type <y_sym> member_declaration_list_with_rbrace 331 %type <y_sym> member_declaration_list 332 %type <y_sym> member_declaration 333 %type <y_sym> notype_member_declarators 334 %type <y_sym> type_member_declarators 335 %type <y_sym> notype_member_declarator 336 %type <y_sym> type_member_declarator 337 %type <y_type> enum_specifier 338 /* No type for enum. */ 339 %type <y_sym> enum_declaration 340 %type <y_sym> enums_with_opt_comma 341 %type <y_sym> enumerator_list 342 %type <y_sym> enumerator 343 %type <y_type_qualifiers> type_qualifier 344 /* No type for atomic. */ 345 %type <y_qual_ptr> pointer 346 %type <y_type_qualifiers> type_qualifier_list_opt 347 %type <y_type_qualifiers> type_qualifier_list 348 /* No type for notype_init_declarators. */ 349 /* No type for type_init_declarators. */ 350 /* No type for notype_init_declarator. */ 351 /* No type for type_init_declarator. */ 352 %type <y_sym> notype_declarator 353 %type <y_sym> type_declarator 354 %type <y_sym> notype_direct_declarator 355 %type <y_sym> type_direct_declarator 356 %type <y_sym> type_param_declarator 357 %type <y_sym> notype_param_declarator 358 %type <y_sym> direct_param_declarator 359 %type <y_sym> direct_notype_param_declarator 360 %type <y_parameter_list> param_list 361 %type <y_array_size> array_size_opt 362 %type <y_sym> identifier_list 363 %type <y_type> type_name 364 %type <y_sym> abstract_declaration 365 %type <y_sym> abstract_declarator 366 %type <y_sym> direct_abstract_declarator 367 %type <y_parameter_list> abstract_decl_param_list 368 /* No type for abstract_decl_lparen. */ 369 %type <y_parameter_list> vararg_parameter_type_list 370 %type <y_parameter_list> parameter_type_list 371 %type <y_sym> parameter_declaration 372 /* No type for braced_initializer. */ 373 /* No type for initializer. */ 374 /* No type for initializer_list. */ 375 /* No type for designation. */ 376 /* No type for designator_list. */ 377 /* No type for designator. */ 378 /* No type for static_assert_declaration. */ 379 %type <y_range> range 380 /* No type for init_lbrace. */ 381 /* No type for init_rbrace. */ 382 %type <y_name> asm_or_symbolrename_opt 383 /* No type for statement. */ 384 /* No type for no_attr_statement. */ 385 /* No type for non_expr_statement. */ 386 /* No type for no_attr_non_expr_statement. */ 387 /* No type for labeled_statement. */ 388 /* No type for label. */ 389 /* No type for compound_statement. */ 390 /* No type for compound_statement_lbrace. */ 391 /* No type for compound_statement_rbrace. */ 392 %type <y_seen_statement> block_item_list 393 %type <y_seen_statement> block_item 394 /* No type for expression_statement. */ 395 /* No type for selection_statement. */ 396 /* No type for if_without_else. */ 397 /* No type for if_expr. */ 398 /* No type for switch_expr. */ 399 /* No type for iteration_statement. */ 400 /* No type for while_expr. */ 401 /* No type for do_statement. */ 402 /* No type for do. */ 403 /* No type for for_start. */ 404 /* No type for for_exprs. */ 405 /* No type for jump_statement. */ 406 /* No type for goto. */ 407 /* No type for asm_statement. */ 408 /* No type for read_until_rparen. */ 409 /* No type for translation_unit. */ 410 /* No type for external_declaration. */ 411 /* No type for top_level_declaration. */ 412 /* No type for function_definition. */ 413 %type <y_sym> func_declarator 414 /* No type for arg_declaration_list_opt. */ 415 /* No type for arg_declaration_list. */ 416 /* No type for arg_declaration. */ 417 /* No type for gcc_attribute_specifier_list_opt. */ 418 /* No type for gcc_attribute_specifier_list. */ 419 /* No type for gcc_attribute_specifier. */ 420 /* No type for gcc_attribute_list. */ 421 /* No type for gcc_attribute. */ 422 /* No type for gcc_attribute_parameters. */ 423 %type <y_in_system_header> sys 424 425 %% 426 427 program: 428 /* empty */ { 429 /* TODO: Make this an error in C99 mode as well. */ 430 if (!allow_trad && !allow_c99) { 431 /* empty translation unit */ 432 error(272); 433 } else if (allow_c90) { 434 /* empty translation unit */ 435 warning(272); 436 } 437 } 438 | translation_unit 439 ; 440 441 identifier_sym: /* helper for struct/union/enum */ 442 identifier { 443 $$ = getsym($1); 444 } 445 ; 446 447 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 448 identifier: 449 T_NAME { 450 debug_step("cgram: name '%s'", $1->sb_name); 451 $$ = $1; 452 } 453 | T_TYPENAME { 454 debug_step("cgram: typename '%s'", $1->sb_name); 455 $$ = $1; 456 } 457 ; 458 459 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 460 string: 461 T_STRING 462 | string T_STRING { 463 if (!allow_c90) { 464 /* concatenated strings are illegal in traditional C */ 465 warning(219); 466 } 467 $$ = cat_strings($1, $2); 468 } 469 ; 470 471 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 472 primary_expression: 473 T_NAME { 474 bool sys_name, sys_next; 475 sys_name = in_system_header; 476 if (yychar < 0) 477 yychar = yylex(); 478 sys_next = in_system_header; 479 in_system_header = sys_name; 480 $$ = build_name(getsym($1), yychar == T_LPAREN); 481 in_system_header = sys_next; 482 } 483 | T_CON { 484 $$ = build_constant(gettyp($1->v_tspec), $1); 485 } 486 | string { 487 $$ = build_string($1); 488 } 489 | T_LPAREN expression T_RPAREN { 490 if ($2 != NULL) 491 $2->tn_parenthesized = true; 492 $$ = $2; 493 } 494 | generic_selection 495 /* GCC primary-expression, see c_parser_postfix_expression */ 496 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 497 set_symtyp(FMEMBER); 498 } member_designator T_RPAREN { 499 $$ = build_offsetof($3, $6); 500 } 501 ; 502 503 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 504 member_designator: 505 identifier { 506 $$ = (designation) { .dn_len = 0 }; 507 designation_push(&$$, DK_MEMBER, getsym($1), 0); 508 } 509 | member_designator T_LBRACK range T_RBRACK { 510 $$ = $1; 511 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 512 } 513 | member_designator T_POINT { 514 set_symtyp(FMEMBER); 515 } identifier { 516 $$ = $1; 517 designation_push(&$$, DK_MEMBER, getsym($4), 0); 518 } 519 ; 520 521 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 522 generic_selection: 523 T_GENERIC T_LPAREN assignment_expression T_COMMA 524 generic_assoc_list T_RPAREN { 525 /* generic selection requires C11 or later */ 526 c11ism(345); 527 $$ = build_generic_selection($3, $5); 528 } 529 ; 530 531 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 532 generic_assoc_list: 533 generic_association 534 | generic_assoc_list T_COMMA generic_association { 535 $3->ga_prev = $1; 536 $$ = $3; 537 } 538 ; 539 540 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 541 generic_association: 542 type_name T_COLON assignment_expression { 543 $$ = block_zero_alloc(sizeof(*$$), "generic"); 544 $$->ga_arg = $1; 545 $$->ga_result = $3; 546 } 547 | T_DEFAULT T_COLON assignment_expression { 548 $$ = block_zero_alloc(sizeof(*$$), "generic"); 549 $$->ga_arg = NULL; 550 $$->ga_result = $3; 551 } 552 ; 553 554 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 555 postfix_expression: 556 primary_expression 557 | postfix_expression T_LBRACK sys expression T_RBRACK { 558 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 559 } 560 | postfix_expression T_LPAREN sys T_RPAREN { 561 $$ = build_function_call($1, $3, NULL); 562 } 563 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 564 $$ = build_function_call($1, $3, $4); 565 } 566 | postfix_expression point_or_arrow sys T_NAME { 567 $$ = build_member_access($1, $2, $3, $4); 568 } 569 | postfix_expression T_INCDEC sys { 570 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 571 } 572 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 573 sym_t *tmp = mktempsym($2); 574 begin_initialization(tmp); 575 cgram_declare(tmp, true, NULL); 576 } braced_initializer { 577 if (!allow_c99) 578 /* compound literals are a C99/GCC extension */ 579 gnuism(319); 580 $$ = build_name(current_initsym(), false); 581 end_initialization(); 582 } 583 | T_LPAREN compound_statement_lbrace { 584 begin_statement_expr(); 585 } gcc_statement_expr_list { 586 do_statement_expr($4); 587 } compound_statement_rbrace T_RPAREN { 588 $$ = end_statement_expr(); 589 } 590 ; 591 592 /* 593 * The inner part of a GCC statement-expression of the form ({ ... }). 594 * 595 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 596 */ 597 gcc_statement_expr_list: 598 gcc_statement_expr_item 599 | gcc_statement_expr_list gcc_statement_expr_item { 600 $$ = $2; 601 } 602 ; 603 604 gcc_statement_expr_item: 605 declaration_or_error { 606 clear_warning_flags(); 607 $$ = NULL; 608 } 609 | non_expr_statement { 610 $$ = expr_alloc_tnode(); 611 $$->tn_type = gettyp(VOID); 612 } 613 | T_SEMI { 614 $$ = expr_alloc_tnode(); 615 $$->tn_type = gettyp(VOID); 616 } 617 | expression T_SEMI { 618 if ($1 == NULL) { /* in case of syntax errors */ 619 $$ = expr_alloc_tnode(); 620 $$->tn_type = gettyp(VOID); 621 } else { 622 /* XXX: do that only on the last name */ 623 if ($1->tn_op == NAME) 624 $1->tn_sym->s_used = true; 625 expr($1, false, false, false, false); 626 suppress_fallthrough = false; 627 $$ = $1; 628 } 629 } 630 ; 631 632 point_or_arrow: /* helper for 'postfix_expression' */ 633 T_POINT { 634 set_symtyp(FMEMBER); 635 $$ = POINT; 636 } 637 | T_ARROW { 638 set_symtyp(FMEMBER); 639 $$ = ARROW; 640 } 641 ; 642 643 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 644 argument_expression_list: 645 assignment_expression { 646 $$ = build_function_argument(NULL, $1); 647 } 648 | argument_expression_list T_COMMA assignment_expression { 649 $$ = build_function_argument($1, $3); 650 } 651 ; 652 653 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 654 unary_expression: 655 postfix_expression 656 | T_INCDEC sys unary_expression { 657 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 658 } 659 | T_AMPER sys cast_expression { 660 $$ = build_unary(ADDR, $2, $3); 661 } 662 | T_ASTERISK sys cast_expression { 663 $$ = build_unary(INDIR, $2, $3); 664 } 665 | T_ADDITIVE sys cast_expression { 666 if (!allow_c90 && $1 == PLUS) { 667 /* unary '+' is illegal in traditional C */ 668 warning(100); 669 } 670 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 671 } 672 | T_COMPLEMENT sys cast_expression { 673 $$ = build_unary(COMPL, $2, $3); 674 } 675 | T_LOGNOT sys cast_expression { 676 $$ = build_unary(NOT, $2, $3); 677 } 678 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 679 $$ = build_unary(REAL, $2, $3); 680 } 681 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 682 $$ = build_unary(IMAG, $2, $3); 683 } 684 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 685 $$ = $2; 686 } 687 | T_SIZEOF unary_expression { 688 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 689 if ($$ != NULL) 690 check_expr_misc($2, 691 false, false, false, false, false, true); 692 } 693 | T_SIZEOF T_LPAREN type_name T_RPAREN { 694 $$ = build_sizeof($3); 695 } 696 | T_ALIGNOF unary_expression { 697 /* non type argument to alignof is a GCC extension */ 698 gnuism(349); 699 lint_assert($2 != NULL); 700 $$ = build_alignof($2->tn_type); 701 } 702 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 703 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 704 /* TODO: c11ism */ 705 $$ = build_alignof($3); 706 } 707 ; 708 709 /* The rule 'unary_operator' is inlined into unary_expression. */ 710 711 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 712 cast_expression: 713 unary_expression 714 | T_LPAREN type_name T_RPAREN sys cast_expression { 715 $$ = cast($5, $4, $2); 716 } 717 ; 718 719 expression_opt: 720 /* empty */ { 721 $$ = NULL; 722 } 723 | expression 724 ; 725 726 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 727 /* 'conditional_expression' also implements 'additive_expression'. */ 728 /* 'conditional_expression' also implements 'shift_expression'. */ 729 /* 'conditional_expression' also implements 'relational_expression'. */ 730 /* 'conditional_expression' also implements 'equality_expression'. */ 731 /* 'conditional_expression' also implements 'AND_expression'. */ 732 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 733 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 734 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 735 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 736 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 737 conditional_expression: 738 cast_expression 739 | conditional_expression T_ASTERISK sys conditional_expression { 740 $$ = build_binary($1, MULT, $3, $4); 741 } 742 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 743 $$ = build_binary($1, $2, $3, $4); 744 } 745 | conditional_expression T_ADDITIVE sys conditional_expression { 746 $$ = build_binary($1, $2, $3, $4); 747 } 748 | conditional_expression T_SHIFT sys conditional_expression { 749 $$ = build_binary($1, $2, $3, $4); 750 } 751 | conditional_expression T_RELATIONAL sys conditional_expression { 752 $$ = build_binary($1, $2, $3, $4); 753 } 754 | conditional_expression T_EQUALITY sys conditional_expression { 755 $$ = build_binary($1, $2, $3, $4); 756 } 757 | conditional_expression T_AMPER sys conditional_expression { 758 $$ = build_binary($1, BITAND, $3, $4); 759 } 760 | conditional_expression T_BITXOR sys conditional_expression { 761 $$ = build_binary($1, BITXOR, $3, $4); 762 } 763 | conditional_expression T_BITOR sys conditional_expression { 764 $$ = build_binary($1, BITOR, $3, $4); 765 } 766 | conditional_expression T_LOGAND sys conditional_expression { 767 $$ = build_binary($1, LOGAND, $3, $4); 768 } 769 | conditional_expression T_LOGOR sys conditional_expression { 770 $$ = build_binary($1, LOGOR, $3, $4); 771 } 772 | conditional_expression T_QUEST sys 773 expression T_COLON sys conditional_expression { 774 $$ = build_binary($1, QUEST, $3, 775 build_binary($4, COLON, $6, $7)); 776 } 777 ; 778 779 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 780 assignment_expression: 781 conditional_expression 782 | unary_expression T_ASSIGN sys assignment_expression { 783 $$ = build_binary($1, ASSIGN, $3, $4); 784 } 785 | unary_expression T_OPASSIGN sys assignment_expression { 786 $$ = build_binary($1, $2, $3, $4); 787 } 788 ; 789 790 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 791 expression: 792 assignment_expression 793 | expression T_COMMA sys assignment_expression { 794 $$ = build_binary($1, COMMA, $3, $4); 795 } 796 ; 797 798 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 799 constant_expression: 800 conditional_expression 801 ; 802 803 declaration_or_error: 804 declaration 805 | error T_SEMI 806 ; 807 808 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 809 declaration: 810 begin_type_declmods end_type T_SEMI { 811 if (dcs->d_scl == TYPEDEF) { 812 /* typedef declares no type name */ 813 warning(72); 814 } else { 815 /* empty declaration */ 816 warning(2); 817 } 818 } 819 | begin_type_declmods end_type notype_init_declarators T_SEMI { 820 if (dcs->d_scl == TYPEDEF) { 821 /* syntax error '%s' */ 822 error(249, "missing base type for typedef"); 823 } else { 824 /* old-style declaration; add 'int' */ 825 error(1); 826 } 827 } 828 | begin_type_declaration_specifiers end_type T_SEMI { 829 if (dcs->d_scl == TYPEDEF) { 830 /* typedef declares no type name */ 831 warning(72); 832 } else if (!dcs->d_nonempty_decl) { 833 /* empty declaration */ 834 warning(2); 835 } 836 } 837 | begin_type_declaration_specifiers end_type 838 type_init_declarators T_SEMI 839 | static_assert_declaration 840 ; 841 842 begin_type_declaration_specifiers: /* see C99 6.7 */ 843 begin_type_typespec { 844 dcs_add_type($1); 845 } 846 | begin_type_declmods type_specifier { 847 dcs_add_type($2); 848 } 849 | type_attribute begin_type_declaration_specifiers 850 | begin_type_declaration_specifiers declmod 851 | begin_type_declaration_specifiers notype_type_specifier { 852 dcs_add_type($2); 853 } 854 ; 855 856 begin_type_declmods: /* see C99 6.7 */ 857 begin_type type_qualifier { 858 dcs_add_qualifiers($2); 859 } 860 | begin_type T_SCLASS { 861 dcs_add_storage_class($2); 862 } 863 | begin_type T_FUNCTION_SPECIFIER { 864 dcs_add_function_specifier($2); 865 } 866 | begin_type_declmods declmod 867 ; 868 869 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 870 begin_type_specifier_qualifier_list_postfix 871 | type_attribute_list begin_type_specifier_qualifier_list_postfix 872 ; 873 874 begin_type_specifier_qualifier_list_postfix: 875 begin_type_typespec { 876 dcs_add_type($1); 877 } 878 | begin_type_qualifier_list type_specifier { 879 dcs_add_type($2); 880 } 881 | begin_type_specifier_qualifier_list_postfix type_qualifier { 882 dcs_add_qualifiers($2); 883 } 884 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 885 dcs_add_type($2); 886 } 887 | begin_type_specifier_qualifier_list_postfix type_attribute 888 ; 889 890 begin_type_typespec: 891 begin_type notype_type_specifier { 892 $$ = $2; 893 } 894 | begin_type T_TYPENAME { 895 $$ = getsym($2)->s_type; 896 } 897 ; 898 899 begin_type_qualifier_list: 900 begin_type type_qualifier { 901 dcs_add_qualifiers($2); 902 } 903 | begin_type_qualifier_list type_qualifier { 904 dcs_add_qualifiers($2); 905 } 906 ; 907 908 declmod: 909 type_qualifier { 910 dcs_add_qualifiers($1); 911 } 912 | T_SCLASS { 913 dcs_add_storage_class($1); 914 } 915 | T_FUNCTION_SPECIFIER { 916 dcs_add_function_specifier($1); 917 } 918 | type_attribute_list 919 ; 920 921 type_attribute_list_opt: 922 /* empty */ 923 | type_attribute_list 924 ; 925 926 type_attribute_list: 927 type_attribute 928 | type_attribute_list type_attribute 929 ; 930 931 type_attribute_opt: 932 /* empty */ 933 | type_attribute 934 ; 935 936 type_attribute: /* See C11 6.7 declaration-specifiers */ 937 gcc_attribute_specifier 938 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 939 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 940 | T_PACKED { 941 dcs_add_packed(); 942 } 943 ; 944 945 begin_type: 946 /* empty */ { 947 dcs_begin_type(); 948 } 949 ; 950 951 end_type: 952 /* empty */ { 953 dcs_end_type(); 954 } 955 ; 956 957 type_specifier: /* C99 6.7.2 */ 958 notype_type_specifier 959 | T_TYPENAME { 960 $$ = getsym($1)->s_type; 961 } 962 ; 963 964 notype_type_specifier: /* see C99 6.7.2 */ 965 T_TYPE { 966 $$ = gettyp($1); 967 } 968 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 969 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 970 $$->t_typeof = true; 971 } 972 | atomic_type_specifier 973 | struct_or_union_specifier { 974 end_declaration_level(); 975 $$ = $1; 976 } 977 | enum_specifier { 978 end_declaration_level(); 979 $$ = $1; 980 } 981 ; 982 983 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 984 atomic_type_specifier: 985 atomic T_LPAREN type_name T_RPAREN { 986 $$ = $3; 987 } 988 ; 989 990 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 991 struct_or_union_specifier: 992 struct_or_union identifier_sym { 993 /* 994 * STDC requires that "struct a;" always introduces 995 * a new tag if "a" is not declared at current level 996 * 997 * yychar is valid because otherwise the parser would not 998 * have been able to decide if it must shift or reduce 999 */ 1000 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1001 } 1002 | struct_or_union identifier_sym { 1003 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1004 } braced_member_declaration_list { 1005 $$ = complete_struct_or_union($4); 1006 } 1007 | struct_or_union { 1008 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1009 } braced_member_declaration_list { 1010 $$ = complete_struct_or_union($3); 1011 } 1012 | struct_or_union error { 1013 set_symtyp(FVFT); 1014 $$ = gettyp(INT); 1015 } 1016 ; 1017 1018 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1019 struct_or_union: 1020 T_STRUCT_OR_UNION { 1021 set_symtyp(FTAG); 1022 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1023 dcs->d_sou_size_in_bits = 0; 1024 dcs->d_sou_align_in_bits = CHAR_SIZE; 1025 $$ = $1; 1026 } 1027 | struct_or_union type_attribute 1028 ; 1029 1030 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1031 T_LBRACE { 1032 set_symtyp(FVFT); 1033 } member_declaration_list_with_rbrace { 1034 $$ = $3; 1035 } 1036 ; 1037 1038 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1039 member_declaration_list T_RBRACE 1040 | T_RBRACE { 1041 /* XXX: This is not allowed by any C standard. */ 1042 $$ = NULL; 1043 } 1044 ; 1045 1046 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1047 /* Was named struct_declaration_list until C11. */ 1048 member_declaration_list: 1049 member_declaration 1050 | member_declaration_list member_declaration { 1051 $$ = concat_symbols($1, $2); 1052 } 1053 ; 1054 1055 /* Was named struct_declaration until C11. */ 1056 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1057 member_declaration: 1058 begin_type_qualifier_list end_type { 1059 /* ^^ There is no check for the missing type-specifier. */ 1060 /* too late, i know, but getsym() compensates it */ 1061 set_symtyp(FMEMBER); 1062 } notype_member_declarators T_SEMI { 1063 set_symtyp(FVFT); 1064 $$ = $4; 1065 } 1066 | begin_type_specifier_qualifier_list end_type { 1067 set_symtyp(FMEMBER); 1068 } type_member_declarators T_SEMI { 1069 set_symtyp(FVFT); 1070 $$ = $4; 1071 } 1072 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1073 /* syntax error '%s' */ 1074 error(249, "member without type"); 1075 $$ = NULL; 1076 } 1077 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1078 T_SEMI { 1079 set_symtyp(FVFT); 1080 if (!allow_c11 && !allow_gcc) 1081 /* anonymous struct/union members is a C11 feature */ 1082 warning(49); 1083 if (is_struct_or_union(dcs->d_type->t_tspec)) 1084 $$ = declare_unnamed_member(); 1085 else { 1086 /* syntax error '%s' */ 1087 error(249, "unnamed member"); 1088 $$ = NULL; 1089 } 1090 } 1091 | static_assert_declaration { 1092 $$ = NULL; 1093 } 1094 | error T_SEMI { 1095 set_symtyp(FVFT); 1096 $$ = NULL; 1097 } 1098 ; 1099 1100 /* Was named struct_declarators until C11. */ 1101 notype_member_declarators: 1102 notype_member_declarator { 1103 $$ = declare_member($1); 1104 } 1105 | notype_member_declarators { 1106 set_symtyp(FMEMBER); 1107 } T_COMMA type_member_declarator { 1108 $$ = concat_symbols($1, declare_member($4)); 1109 } 1110 ; 1111 1112 /* Was named struct_declarators until C11. */ 1113 type_member_declarators: 1114 type_member_declarator { 1115 $$ = declare_member($1); 1116 } 1117 | type_member_declarators { 1118 set_symtyp(FMEMBER); 1119 } T_COMMA type_member_declarator { 1120 $$ = concat_symbols($1, declare_member($4)); 1121 } 1122 ; 1123 1124 /* Was named struct_declarator until C11. */ 1125 notype_member_declarator: 1126 notype_declarator 1127 /* C99 6.7.2.1 */ 1128 | notype_declarator T_COLON constant_expression { 1129 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1130 } 1131 /* C99 6.7.2.1 */ 1132 | { 1133 set_symtyp(FVFT); 1134 } T_COLON constant_expression { 1135 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1136 } 1137 ; 1138 1139 /* Was named struct_declarator until C11. */ 1140 type_member_declarator: 1141 type_declarator 1142 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1143 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1144 } 1145 | { 1146 set_symtyp(FVFT); 1147 } T_COLON constant_expression type_attribute_list_opt { 1148 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1149 } 1150 ; 1151 1152 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1153 enum_specifier: 1154 enum gcc_attribute_specifier_list_opt identifier_sym { 1155 $$ = make_tag_type($3, ENUM, false, false); 1156 } 1157 | enum gcc_attribute_specifier_list_opt identifier_sym { 1158 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1159 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1160 $$ = complete_enum($5); 1161 } 1162 | enum gcc_attribute_specifier_list_opt { 1163 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1164 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1165 $$ = complete_enum($4); 1166 } 1167 | enum error { 1168 set_symtyp(FVFT); 1169 $$ = gettyp(INT); 1170 } 1171 ; 1172 1173 enum: /* helper for C99 6.7.2.2 */ 1174 T_ENUM { 1175 set_symtyp(FTAG); 1176 begin_declaration_level(DLK_ENUM); 1177 } 1178 ; 1179 1180 enum_declaration: /* helper for C99 6.7.2.2 */ 1181 T_LBRACE { 1182 set_symtyp(FVFT); 1183 enumval = 0; 1184 } enums_with_opt_comma T_RBRACE { 1185 $$ = $3; 1186 } 1187 ; 1188 1189 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1190 enumerator_list 1191 | enumerator_list T_COMMA { 1192 if (!allow_c99 && !allow_trad) { 1193 /* trailing ',' in enum declaration requires C99 ... */ 1194 error(54); 1195 } else { 1196 /* trailing ',' in enum declaration requires C99 ... */ 1197 c99ism(54); 1198 } 1199 $$ = $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 $$ = add_function(symbolrename($1, $3), $2); 1414 end_declaration_level(); 1415 block_level--; 1416 } 1417 ; 1418 1419 param_list: 1420 T_LPAREN { 1421 block_level++; 1422 begin_declaration_level(DLK_PROTO_PARAMS); 1423 } identifier_list T_RPAREN { 1424 $$ = (struct 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 $$ = (struct parameter_list){ .first = NULL }; 1545 } 1546 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1547 type_attribute_opt { 1548 $$ = $2; 1549 $$.prototype = true; 1550 } 1551 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1552 $$ = (struct 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 } 1578 $$ = (struct parameter_list){ .vararg = true }; 1579 } 1580 ; 1581 1582 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1583 parameter_type_list: 1584 parameter_declaration { 1585 $$ = (struct parameter_list){ .first = $1 }; 1586 } 1587 | parameter_type_list T_COMMA parameter_declaration { 1588 $$ = $1; 1589 $$.first = concat_symbols($1.first, $3); 1590 } 1591 ; 1592 1593 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1594 parameter_declaration: 1595 begin_type_declmods end_type { 1596 /* ^^ There is no check for the missing type-specifier. */ 1597 $$ = declare_parameter(abstract_name(), false); 1598 } 1599 | begin_type_declaration_specifiers end_type { 1600 $$ = declare_parameter(abstract_name(), false); 1601 } 1602 | begin_type_declmods end_type notype_param_declarator { 1603 /* ^^ There is no check for the missing type-specifier. */ 1604 $$ = declare_parameter($3, false); 1605 } 1606 /* 1607 * type_param_declarator is needed because of following conflict: 1608 * "typedef int a; f(int (a));" could be parsed as 1609 * "function with argument a of type int", or 1610 * "function with an unnamed (abstract) argument of type function". 1611 * This grammar realizes the second case. 1612 */ 1613 | begin_type_declaration_specifiers end_type type_param_declarator { 1614 $$ = declare_parameter($3, false); 1615 } 1616 | begin_type_declmods end_type abstract_declarator { 1617 /* ^^ There is no check for the missing type-specifier. */ 1618 $$ = declare_parameter($3, false); 1619 } 1620 | begin_type_declaration_specifiers end_type abstract_declarator { 1621 $$ = declare_parameter($3, false); 1622 } 1623 ; 1624 1625 braced_initializer: 1626 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1627 init_lbrace init_rbrace { 1628 /* empty initializer braces require C23 or later */ 1629 c23ism(353); 1630 } 1631 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1632 | init_lbrace initializer_list init_rbrace 1633 | init_lbrace initializer_list T_COMMA init_rbrace 1634 ; 1635 1636 initializer: /* C99 6.7.8 "Initialization" */ 1637 assignment_expression { 1638 init_expr($1); 1639 } 1640 | init_lbrace init_rbrace { 1641 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1642 } 1643 | init_lbrace initializer_list init_rbrace 1644 | init_lbrace initializer_list T_COMMA init_rbrace 1645 /* XXX: What is this error handling for? */ 1646 | error 1647 ; 1648 1649 initializer_list: /* C99 6.7.8 "Initialization" */ 1650 initializer 1651 | designation initializer 1652 | initializer_list T_COMMA initializer 1653 | initializer_list T_COMMA designation initializer 1654 ; 1655 1656 designation: /* C99 6.7.8 "Initialization" */ 1657 { 1658 begin_designation(); 1659 } designator_list T_ASSIGN 1660 | identifier T_COLON { 1661 /* GCC style struct or union member name in initializer */ 1662 gnuism(315); 1663 begin_designation(); 1664 add_designator_member($1); 1665 } 1666 ; 1667 1668 designator_list: /* C99 6.7.8 "Initialization" */ 1669 designator 1670 | designator_list designator 1671 ; 1672 1673 designator: /* C99 6.7.8 "Initialization" */ 1674 T_LBRACK range T_RBRACK { 1675 if (!allow_c99) 1676 /* array initializer with designators is a C99 ... */ 1677 warning(321); 1678 add_designator_subscript($2); 1679 } 1680 | T_POINT identifier { 1681 if (!allow_c99) 1682 /* struct or union member name in initializer is ... */ 1683 warning(313); 1684 add_designator_member($2); 1685 } 1686 ; 1687 1688 static_assert_declaration: 1689 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1690 T_RPAREN T_SEMI { 1691 /* '_Static_assert' requires C11 or later */ 1692 c11ism(354); 1693 } 1694 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1695 /* '_Static_assert' without message requires C23 or later */ 1696 c23ism(355); 1697 } 1698 ; 1699 1700 range: 1701 constant_expression { 1702 $$.lo = to_int_constant($1, true); 1703 $$.hi = $$.lo; 1704 } 1705 | constant_expression T_ELLIPSIS constant_expression { 1706 $$.lo = to_int_constant($1, true); 1707 $$.hi = to_int_constant($3, true); 1708 /* initialization with '[a...b]' is a GCC extension */ 1709 gnuism(340); 1710 } 1711 ; 1712 1713 init_lbrace: /* helper */ 1714 T_LBRACE { 1715 init_lbrace(); 1716 } 1717 ; 1718 1719 init_rbrace: /* helper */ 1720 T_RBRACE { 1721 init_rbrace(); 1722 } 1723 ; 1724 1725 asm_or_symbolrename_opt: /* GCC extensions */ 1726 /* empty */ { 1727 $$ = NULL; 1728 } 1729 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1730 freeyyv(&$3, T_STRING); 1731 $$ = NULL; 1732 } 1733 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1734 gcc_attribute_specifier_list_opt { 1735 $$ = $3; 1736 } 1737 ; 1738 1739 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1740 statement: 1741 expression_statement 1742 | non_expr_statement 1743 ; 1744 1745 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1746 no_attr_statement: 1747 expression_statement 1748 | no_attr_non_expr_statement 1749 ; 1750 1751 non_expr_statement: /* helper for C99 6.8 */ 1752 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1753 | no_attr_non_expr_statement 1754 ; 1755 1756 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1757 no_attr_non_expr_statement: 1758 labeled_statement 1759 | compound_statement 1760 | selection_statement 1761 | iteration_statement 1762 | jump_statement { 1763 suppress_fallthrough = false; 1764 } 1765 | asm_statement 1766 ; 1767 1768 labeled_statement: /* C99 6.8.1 */ 1769 label gcc_attribute_specifier_list_opt no_attr_statement 1770 ; 1771 1772 label: 1773 T_NAME T_COLON { 1774 set_symtyp(FLABEL); 1775 named_label(getsym($1)); 1776 } 1777 | T_CASE constant_expression T_COLON { 1778 case_label($2); 1779 suppress_fallthrough = true; 1780 } 1781 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1782 /* XXX: We don't fill all cases */ 1783 case_label($2); 1784 suppress_fallthrough = true; 1785 } 1786 | T_DEFAULT T_COLON { 1787 default_label(); 1788 suppress_fallthrough = true; 1789 } 1790 ; 1791 1792 compound_statement: /* C99 6.8.2 */ 1793 compound_statement_lbrace compound_statement_rbrace 1794 | compound_statement_lbrace block_item_list compound_statement_rbrace 1795 ; 1796 1797 compound_statement_lbrace: 1798 T_LBRACE { 1799 block_level++; 1800 mem_block_level++; 1801 debug_step("%s: mem_block_level = %zu", 1802 "compound_statement_lbrace", mem_block_level); 1803 begin_declaration_level(DLK_AUTO); 1804 } 1805 ; 1806 1807 compound_statement_rbrace: 1808 T_RBRACE { 1809 end_declaration_level(); 1810 if (!in_statement_expr()) 1811 level_free_all(mem_block_level); /* leak */ 1812 mem_block_level--; 1813 debug_step("%s: mem_block_level = %zu", 1814 "compound_statement_rbrace", mem_block_level); 1815 block_level--; 1816 suppress_fallthrough = false; 1817 } 1818 ; 1819 1820 block_item_list: /* C99 6.8.2 */ 1821 block_item 1822 | block_item_list block_item { 1823 if ($1 && !$2) 1824 /* declarations after statements is a C99 feature */ 1825 c99ism(327); 1826 $$ = $1 || $2; 1827 } 1828 ; 1829 1830 block_item: /* C99 6.8.2 */ 1831 declaration_or_error { 1832 $$ = false; 1833 restore_warning_flags(); 1834 } 1835 | statement { 1836 $$ = true; 1837 restore_warning_flags(); 1838 } 1839 ; 1840 1841 expression_statement: /* C99 6.8.3 */ 1842 expression T_SEMI { 1843 expr($1, false, false, false, false); 1844 suppress_fallthrough = false; 1845 } 1846 | T_SEMI { 1847 check_statement_reachable(); 1848 suppress_fallthrough = false; 1849 } 1850 ; 1851 1852 selection_statement: /* C99 6.8.4 */ 1853 if_without_else %prec T_THEN { 1854 save_warning_flags(); 1855 stmt_if_then_stmt(); 1856 stmt_if_else_stmt(false); 1857 } 1858 | if_without_else T_ELSE { 1859 save_warning_flags(); 1860 stmt_if_then_stmt(); 1861 } statement { 1862 clear_warning_flags(); 1863 stmt_if_else_stmt(true); 1864 } 1865 | if_without_else T_ELSE error { 1866 clear_warning_flags(); 1867 stmt_if_else_stmt(false); 1868 } 1869 | switch_expr statement { 1870 clear_warning_flags(); 1871 stmt_switch_expr_stmt(); 1872 } 1873 | switch_expr error { 1874 clear_warning_flags(); 1875 stmt_switch_expr_stmt(); 1876 } 1877 ; 1878 1879 if_without_else: /* see C99 6.8.4 */ 1880 if_expr statement 1881 | if_expr error 1882 ; 1883 1884 if_expr: /* see C99 6.8.4 */ 1885 T_IF T_LPAREN expression T_RPAREN { 1886 stmt_if_expr($3); 1887 clear_warning_flags(); 1888 } 1889 ; 1890 1891 switch_expr: /* see C99 6.8.4 */ 1892 T_SWITCH T_LPAREN expression T_RPAREN { 1893 stmt_switch_expr($3); 1894 clear_warning_flags(); 1895 } 1896 ; 1897 1898 iteration_statement: /* C99 6.8.5 */ 1899 while_expr statement { 1900 clear_warning_flags(); 1901 stmt_while_expr_stmt(); 1902 } 1903 | while_expr error { 1904 clear_warning_flags(); 1905 stmt_while_expr_stmt(); 1906 } 1907 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1908 stmt_do_while_expr($4); 1909 suppress_fallthrough = false; 1910 } 1911 | do error { 1912 clear_warning_flags(); 1913 stmt_do_while_expr(NULL); 1914 } 1915 | for_exprs statement { 1916 clear_warning_flags(); 1917 stmt_for_exprs_stmt(); 1918 end_declaration_level(); 1919 block_level--; 1920 } 1921 | for_exprs error { 1922 clear_warning_flags(); 1923 stmt_for_exprs_stmt(); 1924 end_declaration_level(); 1925 block_level--; 1926 } 1927 ; 1928 1929 while_expr: /* see C99 6.8.5 */ 1930 T_WHILE T_LPAREN expression T_RPAREN { 1931 stmt_while_expr($3); 1932 clear_warning_flags(); 1933 } 1934 ; 1935 1936 do_statement: /* see C99 6.8.5 */ 1937 do statement { 1938 clear_warning_flags(); 1939 } 1940 ; 1941 1942 do: /* see C99 6.8.5 */ 1943 T_DO { 1944 stmt_do(); 1945 } 1946 ; 1947 1948 for_start: /* see C99 6.8.5 */ 1949 T_FOR T_LPAREN { 1950 begin_declaration_level(DLK_AUTO); 1951 block_level++; 1952 } 1953 ; 1954 1955 for_exprs: /* see C99 6.8.5 */ 1956 for_start 1957 begin_type_declaration_specifiers end_type 1958 notype_init_declarators T_SEMI 1959 expression_opt T_SEMI 1960 expression_opt T_RPAREN { 1961 /* variable declaration in for loop */ 1962 c99ism(325); 1963 stmt_for_exprs(NULL, $6, $8); 1964 clear_warning_flags(); 1965 } 1966 | for_start 1967 expression_opt T_SEMI 1968 expression_opt T_SEMI 1969 expression_opt T_RPAREN { 1970 stmt_for_exprs($2, $4, $6); 1971 clear_warning_flags(); 1972 } 1973 ; 1974 1975 jump_statement: /* C99 6.8.6 */ 1976 goto identifier T_SEMI { 1977 stmt_goto(getsym($2)); 1978 } 1979 | goto error T_SEMI { 1980 set_symtyp(FVFT); 1981 } 1982 | T_CONTINUE T_SEMI { 1983 stmt_continue(); 1984 } 1985 | T_BREAK T_SEMI { 1986 stmt_break(); 1987 } 1988 | T_RETURN sys T_SEMI { 1989 stmt_return($2, NULL); 1990 } 1991 | T_RETURN sys expression T_SEMI { 1992 stmt_return($2, $3); 1993 } 1994 ; 1995 1996 goto: /* see C99 6.8.6 */ 1997 T_GOTO { 1998 set_symtyp(FLABEL); 1999 } 2000 ; 2001 2002 asm_statement: /* GCC extension */ 2003 T_ASM T_LPAREN read_until_rparen T_SEMI { 2004 dcs_set_asm(); 2005 } 2006 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2007 dcs_set_asm(); 2008 } 2009 | T_ASM error 2010 ; 2011 2012 read_until_rparen: /* helper for 'asm_statement' */ 2013 /* empty */ { 2014 read_until_rparen(); 2015 } 2016 ; 2017 2018 translation_unit: /* C99 6.9 */ 2019 external_declaration 2020 | translation_unit external_declaration 2021 ; 2022 2023 external_declaration: /* C99 6.9 */ 2024 function_definition { 2025 global_clean_up_decl(false); 2026 clear_warning_flags(); 2027 } 2028 | top_level_declaration { 2029 global_clean_up_decl(false); 2030 clear_warning_flags(); 2031 } 2032 | asm_statement /* GCC extension */ 2033 | T_SEMI { /* GCC extension */ 2034 /* 2035 * TODO: Only allow this in GCC mode, not in plain C99. 2036 * This is one of the top 10 warnings in the NetBSD build. 2037 */ 2038 if (!allow_trad && !allow_c99) { 2039 /* empty declaration */ 2040 error(0); 2041 } else if (allow_c90) { 2042 /* empty declaration */ 2043 warning(0); 2044 } 2045 } 2046 ; 2047 2048 /* 2049 * On the top level, lint allows several forms of declarations that it doesn't 2050 * allow in functions. For example, a single ';' is an empty declaration and 2051 * is supported by some compilers, but in a function it would be an empty 2052 * statement, not a declaration. This makes a difference in C90 mode, where 2053 * a statement must not be followed by a declaration. 2054 * 2055 * See 'declaration' for all other declarations. 2056 */ 2057 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2058 begin_type end_type notype_init_declarators T_SEMI { 2059 /* TODO: Make this an error in C99 mode as well. */ 2060 if (!allow_trad && !allow_c99) { 2061 /* old-style declaration; add 'int' */ 2062 error(1); 2063 } else if (allow_c90) { 2064 /* old-style declaration; add 'int' */ 2065 warning(1); 2066 } 2067 } 2068 | declaration 2069 | error T_SEMI { 2070 global_clean_up(); 2071 } 2072 | error T_RBRACE { 2073 global_clean_up(); 2074 } 2075 ; 2076 2077 function_definition: /* C99 6.9.1 */ 2078 func_declarator { 2079 if ($1->s_type->t_tspec != FUNC) { 2080 /* syntax error '%s' */ 2081 error(249, yytext); 2082 YYERROR; 2083 } 2084 if ($1->s_type->t_typedef) { 2085 /* ()-less function definition */ 2086 error(64); 2087 YYERROR; 2088 } 2089 check_extern_declaration($1); 2090 begin_function($1); 2091 block_level++; 2092 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2093 if (lwarn == LWARN_NONE) 2094 $1->s_used = true; 2095 } arg_declaration_list_opt { 2096 end_declaration_level(); 2097 block_level--; 2098 check_func_lint_directives(); 2099 check_func_old_style_parameters(); 2100 begin_control_statement(CS_FUNCTION_BODY); 2101 } compound_statement { 2102 end_function(); 2103 end_control_statement(CS_FUNCTION_BODY); 2104 } 2105 ; 2106 2107 func_declarator: 2108 begin_type end_type notype_declarator { 2109 if (!allow_trad) { 2110 /* old-style declaration; add 'int' */ 2111 error(1); 2112 } 2113 $$ = $3; 2114 } 2115 | begin_type_declmods end_type notype_declarator { 2116 if (!allow_trad) { 2117 /* old-style declaration; add 'int' */ 2118 error(1); 2119 } 2120 $$ = $3; 2121 } 2122 | begin_type_declaration_specifiers end_type type_declarator { 2123 $$ = $3; 2124 } 2125 ; 2126 2127 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2128 /* empty */ 2129 | arg_declaration_list 2130 ; 2131 2132 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2133 arg_declaration 2134 | arg_declaration_list arg_declaration 2135 /* XXX or better "arg_declaration error" ? */ 2136 | error 2137 ; 2138 2139 /* 2140 * "arg_declaration" is separated from "declaration" because it 2141 * needs other error handling. 2142 */ 2143 arg_declaration: 2144 begin_type_declmods end_type T_SEMI { 2145 /* empty declaration */ 2146 warning(2); 2147 } 2148 | begin_type_declmods end_type notype_init_declarators T_SEMI 2149 | begin_type_declaration_specifiers end_type T_SEMI { 2150 if (!dcs->d_nonempty_decl) { 2151 /* empty declaration */ 2152 warning(2); 2153 } else { 2154 /* '%s' declared in parameter declaration list */ 2155 warning(3, type_name(dcs->d_type)); 2156 } 2157 } 2158 | begin_type_declaration_specifiers end_type 2159 type_init_declarators T_SEMI { 2160 if (dcs->d_nonempty_decl) { 2161 /* '%s' declared in parameter declaration list */ 2162 warning(3, type_name(dcs->d_type)); 2163 } 2164 } 2165 | begin_type_declmods error 2166 | begin_type_declaration_specifiers error 2167 ; 2168 2169 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2170 gcc_attribute_specifier_list_opt: 2171 /* empty */ 2172 | gcc_attribute_specifier_list 2173 ; 2174 2175 gcc_attribute_specifier_list: 2176 gcc_attribute_specifier 2177 | gcc_attribute_specifier_list gcc_attribute_specifier 2178 ; 2179 2180 gcc_attribute_specifier: 2181 T_ATTRIBUTE T_LPAREN T_LPAREN { 2182 in_gcc_attribute = true; 2183 } gcc_attribute_list { 2184 in_gcc_attribute = false; 2185 } T_RPAREN T_RPAREN 2186 ; 2187 2188 gcc_attribute_list: 2189 gcc_attribute 2190 | gcc_attribute_list T_COMMA gcc_attribute 2191 ; 2192 2193 gcc_attribute: 2194 /* empty */ 2195 | T_NAME { 2196 const char *name = $1->sb_name; 2197 if (is_either(name, "packed", "__packed__")) 2198 dcs_add_packed(); 2199 else if (is_either(name, "used", "__used__") || 2200 is_either(name, "unused", "__unused__")) 2201 dcs_set_used(); 2202 else if (is_either(name, "fallthrough", "__fallthrough__")) 2203 suppress_fallthrough = true; 2204 } 2205 | T_NAME T_LPAREN T_RPAREN 2206 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2207 | type_qualifier { 2208 if (!$1.tq_const) 2209 yyerror("Bad attribute"); 2210 } 2211 ; 2212 2213 gcc_attribute_parameters: 2214 constant_expression 2215 | gcc_attribute_parameters T_COMMA constant_expression 2216 ; 2217 2218 sys: 2219 /* empty */ { 2220 $$ = in_system_header; 2221 } 2222 ; 2223 2224 %% 2225 2226 /* ARGSUSED */ 2227 int 2228 yyerror(const char *msg) 2229 { 2230 /* syntax error '%s' */ 2231 error(249, yytext); 2232 if (++sytxerr >= 5) 2233 norecover(); 2234 return 0; 2235 } 2236 2237 #if YYDEBUG && YYBYACC 2238 static const char * 2239 cgram_to_string(int token, YYSTYPE val) 2240 { 2241 2242 switch (token) { 2243 case T_INCDEC: 2244 return val.y_inc ? "++" : "--"; 2245 case T_MULTIPLICATIVE: 2246 case T_ADDITIVE: 2247 case T_SHIFT: 2248 case T_RELATIONAL: 2249 case T_EQUALITY: 2250 case T_OPASSIGN: 2251 return op_name(val.y_op); 2252 case T_SCLASS: 2253 return scl_name(val.y_scl); 2254 case T_TYPE: 2255 case T_STRUCT_OR_UNION: 2256 return tspec_name(val.y_tspec); 2257 case T_QUAL: 2258 return type_qualifiers_string(val.y_type_qualifiers); 2259 case T_FUNCTION_SPECIFIER: 2260 return function_specifier_name(val.y_function_specifier); 2261 case T_NAME: 2262 return val.y_name->sb_name; 2263 default: 2264 return "<none>"; 2265 } 2266 } 2267 #endif 2268 2269 static void 2270 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2271 { 2272 declare(decl, has_initializer, renaming); 2273 if (renaming != NULL) 2274 freeyyv(&renaming, T_NAME); 2275 } 2276 2277 /* 2278 * Discard all input tokens up to and including the next unmatched right 2279 * parenthesis. 2280 */ 2281 static void 2282 read_until_rparen(void) 2283 { 2284 int level; 2285 2286 if (yychar < 0) 2287 yychar = yylex(); 2288 freeyyv(&yylval, yychar); 2289 2290 level = 1; 2291 while (yychar > 0) { 2292 if (yychar == T_LPAREN) 2293 level++; 2294 if (yychar == T_RPAREN && --level == 0) 2295 break; 2296 freeyyv(&yylval, yychar = yylex()); 2297 } 2298 2299 yyclearin; 2300 } 2301 2302 static sym_t * 2303 symbolrename(sym_t *s, sbuf_t *sb) 2304 { 2305 if (sb != NULL) 2306 s->s_rename = sb->sb_name; 2307 return s; 2308 } 2309
Indexes created Fri Oct 03 02:09:57 GMT 2025