cgram.y revision 1.495
1 %{ 2 /* $NetBSD: cgram.y,v 1.495 2024/05/03 04:04:17 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 1.495 2024/05/03 04:04:17 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 reset_suppressions(); 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 %type <y_in_system_header> sys 427 428 %% 429 430 program: 431 /* empty */ { 432 /* TODO: Make this an error in C99 mode as well. */ 433 if (!allow_trad && !allow_c99) 434 /* empty translation unit */ 435 error(272); 436 else if (allow_c90) 437 /* empty translation unit */ 438 warning(272); 439 } 440 | translation_unit 441 ; 442 443 identifier_sym: /* helper for struct/union/enum */ 444 identifier { 445 $$ = getsym($1); 446 } 447 ; 448 449 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 450 identifier: 451 T_NAME { 452 debug_step("cgram: name '%s'", $1->sb_name); 453 $$ = $1; 454 } 455 | T_TYPENAME { 456 debug_step("cgram: typename '%s'", $1->sb_name); 457 $$ = $1; 458 } 459 ; 460 461 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 462 string: 463 T_STRING 464 | string T_STRING { 465 if (!allow_c90) 466 /* concatenated strings are illegal in traditional C */ 467 warning(219); 468 $$ = cat_strings($1, $2); 469 } 470 ; 471 472 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 473 primary_expression: 474 T_NAME { 475 bool sys_name, sys_next; 476 sys_name = in_system_header; 477 if (yychar < 0) 478 yychar = yylex(); 479 sys_next = in_system_header; 480 in_system_header = sys_name; 481 $$ = build_name(getsym($1), yychar == T_LPAREN); 482 in_system_header = sys_next; 483 } 484 | T_CON { 485 $$ = build_constant(gettyp($1->v_tspec), $1); 486 } 487 | string { 488 $$ = build_string($1); 489 } 490 | T_LPAREN expression T_RPAREN { 491 if ($2 != NULL) 492 $2->tn_parenthesized = true; 493 $$ = $2; 494 } 495 | generic_selection 496 /* GCC primary-expression, see c_parser_postfix_expression */ 497 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 498 set_sym_kind(SK_MEMBER); 499 } member_designator T_RPAREN { 500 $$ = build_offsetof($3, $6); 501 } 502 ; 503 504 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 505 member_designator: 506 identifier { 507 $$ = (designation) { .dn_len = 0 }; 508 designation_push(&$$, DK_MEMBER, getsym($1), 0); 509 } 510 | member_designator T_LBRACK range T_RBRACK { 511 $$ = $1; 512 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 513 } 514 | member_designator T_POINT { 515 set_sym_kind(SK_MEMBER); 516 } identifier { 517 $$ = $1; 518 designation_push(&$$, DK_MEMBER, getsym($4), 0); 519 } 520 ; 521 522 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 523 generic_selection: 524 T_GENERIC T_LPAREN assignment_expression T_COMMA 525 generic_assoc_list T_RPAREN { 526 /* generic selection requires C11 or later */ 527 c11ism(345); 528 $$ = build_generic_selection($3, $5); 529 } 530 ; 531 532 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 533 generic_assoc_list: 534 generic_association 535 | generic_assoc_list T_COMMA generic_association { 536 $3->ga_prev = $1; 537 $$ = $3; 538 } 539 ; 540 541 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 542 generic_association: 543 type_name T_COLON assignment_expression { 544 $$ = block_zero_alloc(sizeof(*$$), "generic"); 545 $$->ga_arg = $1; 546 $$->ga_result = $3; 547 } 548 | T_DEFAULT T_COLON assignment_expression { 549 $$ = block_zero_alloc(sizeof(*$$), "generic"); 550 $$->ga_arg = NULL; 551 $$->ga_result = $3; 552 } 553 ; 554 555 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 556 postfix_expression: 557 primary_expression 558 | postfix_expression T_LBRACK sys expression T_RBRACK { 559 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 560 } 561 | postfix_expression T_LPAREN sys T_RPAREN { 562 function_call *call = 563 expr_zero_alloc(sizeof(*call), "function_call"); 564 $$ = build_function_call($1, $3, call); 565 } 566 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 567 $$ = build_function_call($1, $3, $4); 568 } 569 | postfix_expression point_or_arrow sys T_NAME { 570 $$ = build_member_access($1, $2, $3, $4); 571 } 572 | postfix_expression T_INCDEC sys { 573 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 574 } 575 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 576 sym_t *tmp = mktempsym($2); 577 begin_initialization(tmp); 578 cgram_declare(tmp, true, NULL); 579 } braced_initializer { 580 if (!allow_c99) 581 /* compound literals are a C99/GCC extension */ 582 gnuism(319); 583 $$ = build_name(current_initsym(), false); 584 end_initialization(); 585 } 586 | T_LPAREN compound_statement_lbrace { 587 begin_statement_expr(); 588 } gcc_statement_expr_list { 589 do_statement_expr($4); 590 } compound_statement_rbrace T_RPAREN { 591 $$ = end_statement_expr(); 592 } 593 ; 594 595 /* 596 * The inner part of a GCC statement-expression of the form ({ ... }). 597 * 598 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 599 */ 600 gcc_statement_expr_list: 601 gcc_statement_expr_item 602 | gcc_statement_expr_list gcc_statement_expr_item { 603 $$ = $2; 604 } 605 ; 606 607 gcc_statement_expr_item: 608 declaration_or_error { 609 clear_warning_flags(); 610 $$ = NULL; 611 } 612 | non_expr_statement { 613 $$ = expr_alloc_tnode(); 614 $$->tn_type = gettyp(VOID); 615 } 616 | T_SEMI { 617 $$ = expr_alloc_tnode(); 618 $$->tn_type = gettyp(VOID); 619 } 620 | expression T_SEMI { 621 if ($1 == NULL) { /* in case of syntax errors */ 622 $$ = expr_alloc_tnode(); 623 $$->tn_type = gettyp(VOID); 624 } else { 625 /* XXX: do that only on the last name */ 626 if ($1->tn_op == NAME) 627 $1->u.sym->s_used = true; 628 expr($1, false, false, false, false); 629 suppress_fallthrough = false; 630 $$ = $1; 631 } 632 } 633 ; 634 635 point_or_arrow: /* helper for 'postfix_expression' */ 636 T_POINT { 637 set_sym_kind(SK_MEMBER); 638 $$ = POINT; 639 } 640 | T_ARROW { 641 set_sym_kind(SK_MEMBER); 642 $$ = ARROW; 643 } 644 ; 645 646 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 647 argument_expression_list: 648 assignment_expression { 649 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 650 add_function_argument($$, $1); 651 } 652 | argument_expression_list T_COMMA assignment_expression { 653 $$ = $1; 654 add_function_argument($1, $3); 655 } 656 ; 657 658 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 659 unary_expression: 660 postfix_expression 661 | T_INCDEC sys unary_expression { 662 $$ = 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 dcs_add_alignas(build_sizeof($3)); 941 } 942 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN { /* C11 6.7.5 */ 943 dcs_add_alignas($3); 944 } 945 | T_PACKED { 946 dcs_add_packed(); 947 } 948 ; 949 950 begin_type: 951 /* empty */ { 952 dcs_begin_type(); 953 } 954 ; 955 956 end_type: 957 /* empty */ { 958 dcs_end_type(); 959 } 960 ; 961 962 type_specifier: /* C99 6.7.2 */ 963 notype_type_specifier 964 | T_TYPENAME { 965 $$ = getsym($1)->s_type; 966 } 967 ; 968 969 notype_type_specifier: /* see C99 6.7.2 */ 970 T_TYPE { 971 $$ = gettyp($1); 972 } 973 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 974 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 975 $$->t_typeof = true; 976 } 977 | atomic_type_specifier 978 | struct_or_union_specifier { 979 end_declaration_level(); 980 $$ = $1; 981 } 982 | enum_specifier { 983 end_declaration_level(); 984 $$ = $1; 985 } 986 ; 987 988 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 989 atomic_type_specifier: 990 atomic T_LPAREN type_name T_RPAREN { 991 $$ = $3; 992 } 993 ; 994 995 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 996 struct_or_union_specifier: 997 struct_or_union identifier_sym { 998 /* 999 * STDC requires that "struct a;" always introduces 1000 * a new tag if "a" is not declared at current level 1001 * 1002 * yychar is valid because otherwise the parser would not 1003 * have been able to decide if it must shift or reduce 1004 */ 1005 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1006 } 1007 | struct_or_union identifier_sym { 1008 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1009 } braced_member_declaration_list { 1010 $$ = complete_struct_or_union($4); 1011 } 1012 | struct_or_union { 1013 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1014 } braced_member_declaration_list { 1015 $$ = complete_struct_or_union($3); 1016 } 1017 | struct_or_union error { 1018 set_sym_kind(SK_VCFT); 1019 $$ = gettyp(INT); 1020 } 1021 ; 1022 1023 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1024 struct_or_union: 1025 T_STRUCT_OR_UNION { 1026 set_sym_kind(SK_TAG); 1027 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1028 dcs->d_sou_size_in_bits = 0; 1029 dcs->d_sou_align = 1; 1030 $$ = $1; 1031 } 1032 | struct_or_union type_attribute 1033 ; 1034 1035 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1036 T_LBRACE { 1037 set_sym_kind(SK_VCFT); 1038 } member_declaration_list_with_rbrace { 1039 $$ = $3; 1040 } 1041 ; 1042 1043 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1044 member_declaration_list T_RBRACE 1045 | T_RBRACE { 1046 /* XXX: Allowed since C23. */ 1047 $$ = NULL; 1048 } 1049 ; 1050 1051 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1052 /* Was named struct_declaration_list until C11. */ 1053 member_declaration_list: 1054 member_declaration 1055 | member_declaration_list member_declaration { 1056 $$ = concat_symbols($1, $2); 1057 } 1058 ; 1059 1060 /* Was named struct_declaration until C11. */ 1061 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1062 member_declaration: 1063 begin_type_qualifier_list end_type { 1064 /* ^^ There is no check for the missing type-specifier. */ 1065 /* too late, i know, but getsym() compensates it */ 1066 set_sym_kind(SK_MEMBER); 1067 } notype_member_declarators T_SEMI { 1068 set_sym_kind(SK_VCFT); 1069 $$ = $4; 1070 } 1071 | begin_type_specifier_qualifier_list end_type { 1072 set_sym_kind(SK_MEMBER); 1073 } type_member_declarators T_SEMI { 1074 set_sym_kind(SK_VCFT); 1075 $$ = $4; 1076 } 1077 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1078 /* syntax error '%s' */ 1079 error(249, "member without type"); 1080 $$ = NULL; 1081 } 1082 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1083 T_SEMI { 1084 set_sym_kind(SK_VCFT); 1085 if (!allow_c11 && !allow_gcc) 1086 /* anonymous struct/union members is a C11 feature */ 1087 warning(49); 1088 if (is_struct_or_union(dcs->d_type->t_tspec)) 1089 $$ = declare_unnamed_member(); 1090 else { 1091 /* syntax error '%s' */ 1092 error(249, "unnamed member"); 1093 $$ = NULL; 1094 } 1095 } 1096 | static_assert_declaration { 1097 $$ = NULL; 1098 } 1099 | error T_SEMI { 1100 set_sym_kind(SK_VCFT); 1101 $$ = NULL; 1102 } 1103 ; 1104 1105 /* Was named struct_declarators until C11. */ 1106 notype_member_declarators: 1107 notype_member_declarator { 1108 $$ = declare_member($1); 1109 } 1110 | notype_member_declarators { 1111 set_sym_kind(SK_MEMBER); 1112 } T_COMMA type_member_declarator { 1113 $$ = concat_symbols($1, declare_member($4)); 1114 } 1115 ; 1116 1117 /* Was named struct_declarators until C11. */ 1118 type_member_declarators: 1119 type_member_declarator { 1120 $$ = declare_member($1); 1121 } 1122 | type_member_declarators { 1123 set_sym_kind(SK_MEMBER); 1124 } T_COMMA type_member_declarator { 1125 $$ = concat_symbols($1, declare_member($4)); 1126 } 1127 ; 1128 1129 /* Was named struct_declarator until C11. */ 1130 notype_member_declarator: 1131 notype_declarator 1132 /* C99 6.7.2.1 */ 1133 | notype_declarator T_COLON constant_expression { 1134 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1135 } 1136 /* C99 6.7.2.1 */ 1137 | { 1138 set_sym_kind(SK_VCFT); 1139 } T_COLON constant_expression { 1140 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1141 } 1142 ; 1143 1144 /* Was named struct_declarator until C11. */ 1145 type_member_declarator: 1146 type_declarator 1147 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1148 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1149 } 1150 | { 1151 set_sym_kind(SK_VCFT); 1152 } T_COLON constant_expression type_attribute_list_opt { 1153 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1154 } 1155 ; 1156 1157 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1158 enum_specifier: 1159 enum gcc_attribute_specifier_list_opt identifier_sym { 1160 $$ = make_tag_type($3, ENUM, false, false); 1161 } 1162 | enum gcc_attribute_specifier_list_opt identifier_sym { 1163 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1164 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1165 $$ = complete_enum($5); 1166 } 1167 | enum gcc_attribute_specifier_list_opt { 1168 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1169 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1170 $$ = complete_enum($4); 1171 } 1172 | enum error { 1173 set_sym_kind(SK_VCFT); 1174 $$ = gettyp(INT); 1175 } 1176 ; 1177 1178 enum: /* helper for C99 6.7.2.2 */ 1179 T_ENUM { 1180 set_sym_kind(SK_TAG); 1181 begin_declaration_level(DLK_ENUM); 1182 } 1183 ; 1184 1185 enum_declaration: /* helper for C99 6.7.2.2 */ 1186 T_LBRACE { 1187 set_sym_kind(SK_VCFT); 1188 enumval = 0; 1189 } enums_with_opt_comma T_RBRACE { 1190 $$ = $3; 1191 } 1192 ; 1193 1194 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1195 enumerator_list 1196 | enumerator_list T_COMMA { 1197 if (!allow_c99 && !allow_trad) 1198 /* trailing ',' in enum declaration requires C99 ... */ 1199 error(54); 1200 else 1201 /* trailing ',' in enum declaration requires C99 ... */ 1202 c99ism(54); 1203 $$ = $1; 1204 } 1205 ; 1206 1207 enumerator_list: /* C99 6.7.2.2 */ 1208 enumerator 1209 | enumerator_list T_COMMA enumerator { 1210 $$ = concat_symbols($1, $3); 1211 } 1212 | error { 1213 $$ = NULL; 1214 } 1215 ; 1216 1217 enumerator: /* C99 6.7.2.2 */ 1218 identifier_sym gcc_attribute_specifier_list_opt { 1219 $$ = enumeration_constant($1, enumval, true); 1220 } 1221 | identifier_sym gcc_attribute_specifier_list_opt 1222 T_ASSIGN constant_expression { 1223 $$ = enumeration_constant($1, to_int_constant($4, true), 1224 false); 1225 } 1226 ; 1227 1228 type_qualifier: /* C99 6.7.3 */ 1229 T_QUAL 1230 | atomic { 1231 $$ = (type_qualifiers){ .tq_atomic = true }; 1232 } 1233 ; 1234 1235 atomic: /* helper */ 1236 T_ATOMIC { 1237 /* TODO: First fix c11ism, then use it here. */ 1238 if (!allow_c11) 1239 /* '_Atomic' requires C11 or later */ 1240 error(350); 1241 } 1242 ; 1243 1244 pointer: /* C99 6.7.5 */ 1245 T_ASTERISK type_qualifier_list_opt { 1246 $$ = xcalloc(1, sizeof(*$$)); 1247 add_type_qualifiers(&$$->qualifiers, $2); 1248 } 1249 | T_ASTERISK type_qualifier_list_opt pointer { 1250 $$ = xcalloc(1, sizeof(*$$)); 1251 add_type_qualifiers(&$$->qualifiers, $2); 1252 $$ = append_qualified_pointer($$, $3); 1253 } 1254 ; 1255 1256 type_qualifier_list_opt: /* see C99 6.7.5 */ 1257 /* empty */ { 1258 $$ = (type_qualifiers){ .tq_const = false }; 1259 } 1260 | type_qualifier_list 1261 ; 1262 1263 type_qualifier_list: /* C99 6.7.5 */ 1264 type_qualifier 1265 | type_qualifier_list type_qualifier { 1266 $$ = $1; 1267 add_type_qualifiers(&$$, $2); 1268 } 1269 ; 1270 1271 /* 1272 * For an explanation of 'notype' in the following rules, see 1273 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1274 */ 1275 1276 notype_init_declarators: 1277 notype_init_declarator 1278 | notype_init_declarators T_COMMA type_init_declarator 1279 ; 1280 1281 type_init_declarators: 1282 type_init_declarator 1283 | type_init_declarators T_COMMA type_init_declarator 1284 ; 1285 1286 notype_init_declarator: 1287 notype_declarator asm_or_symbolrename_opt { 1288 cgram_declare($1, false, $2); 1289 check_size($1); 1290 } 1291 | notype_declarator asm_or_symbolrename_opt { 1292 begin_initialization($1); 1293 cgram_declare($1, true, $2); 1294 } T_ASSIGN initializer { 1295 check_size($1); 1296 end_initialization(); 1297 } 1298 ; 1299 1300 type_init_declarator: 1301 type_declarator asm_or_symbolrename_opt { 1302 cgram_declare($1, false, $2); 1303 check_size($1); 1304 } 1305 | type_declarator asm_or_symbolrename_opt { 1306 begin_initialization($1); 1307 cgram_declare($1, true, $2); 1308 } T_ASSIGN initializer { 1309 check_size($1); 1310 end_initialization(); 1311 } 1312 ; 1313 1314 notype_declarator: 1315 notype_direct_declarator 1316 | pointer notype_direct_declarator { 1317 $$ = add_pointer($2, $1); 1318 } 1319 ; 1320 1321 type_declarator: 1322 type_direct_declarator 1323 | pointer type_direct_declarator { 1324 $$ = add_pointer($2, $1); 1325 } 1326 ; 1327 1328 notype_direct_declarator: 1329 type_attribute_list_opt T_NAME { 1330 $$ = declarator_name(getsym($2)); 1331 } 1332 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1333 $$ = $3; 1334 } 1335 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1336 $$ = add_array($1, $3.has_dim, $3.dim); 1337 } 1338 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1339 $$ = add_function(symbolrename($1, $3), $2); 1340 end_declaration_level(); 1341 block_level--; 1342 } 1343 | notype_direct_declarator type_attribute 1344 ; 1345 1346 type_direct_declarator: 1347 type_attribute_list_opt identifier { 1348 $$ = declarator_name(getsym($2)); 1349 } 1350 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1351 $$ = $3; 1352 } 1353 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1354 $$ = add_array($1, $3.has_dim, $3.dim); 1355 } 1356 | type_direct_declarator param_list asm_or_symbolrename_opt { 1357 $$ = add_function(symbolrename($1, $3), $2); 1358 end_declaration_level(); 1359 block_level--; 1360 } 1361 | type_direct_declarator type_attribute 1362 ; 1363 1364 /* 1365 * The two distinct rules type_param_declarator and notype_param_declarator 1366 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1367 * always treated as a typename, not an argument name. For example, after 1368 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1369 * "f(int (double));", not "f(int a);". 1370 */ 1371 type_param_declarator: 1372 direct_param_declarator 1373 | pointer direct_param_declarator { 1374 $$ = add_pointer($2, $1); 1375 } 1376 ; 1377 1378 notype_param_declarator: 1379 direct_notype_param_declarator 1380 | pointer direct_notype_param_declarator { 1381 $$ = add_pointer($2, $1); 1382 } 1383 ; 1384 1385 direct_param_declarator: 1386 identifier type_attribute_list { 1387 $$ = declarator_name(getsym($1)); 1388 } 1389 | identifier { 1390 $$ = declarator_name(getsym($1)); 1391 } 1392 | T_LPAREN notype_param_declarator T_RPAREN { 1393 $$ = $2; 1394 } 1395 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1396 gcc_attribute_specifier_list_opt { 1397 $$ = add_array($1, $3.has_dim, $3.dim); 1398 } 1399 | direct_param_declarator param_list asm_or_symbolrename_opt { 1400 $$ = add_function(symbolrename($1, $3), $2); 1401 end_declaration_level(); 1402 block_level--; 1403 } 1404 ; 1405 1406 direct_notype_param_declarator: 1407 identifier { 1408 $$ = declarator_name(getsym($1)); 1409 } 1410 | T_LPAREN notype_param_declarator T_RPAREN { 1411 $$ = $2; 1412 } 1413 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1414 $$ = add_array($1, $3.has_dim, $3.dim); 1415 } 1416 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1417 $$ = add_function(symbolrename($1, $3), $2); 1418 end_declaration_level(); 1419 block_level--; 1420 } 1421 ; 1422 1423 param_list: 1424 T_LPAREN { 1425 block_level++; 1426 begin_declaration_level(DLK_PROTO_PARAMS); 1427 } identifier_list T_RPAREN { 1428 $$ = (parameter_list){ .first = $3 }; 1429 } 1430 | abstract_decl_param_list 1431 ; 1432 1433 array_size_opt: 1434 /* empty */ { 1435 $$.has_dim = false; 1436 $$.dim = 0; 1437 } 1438 | T_ASTERISK { 1439 /* since C99; variable length array of unspecified size */ 1440 $$.has_dim = false; /* TODO: maybe change to true */ 1441 $$.dim = 0; /* just as a placeholder */ 1442 } 1443 | type_qualifier_list_opt T_SCLASS constant_expression { 1444 /* C11 6.7.6.3p7 */ 1445 if ($2 != STATIC) 1446 yyerror("Bad attribute"); 1447 /* static array size requires C11 or later */ 1448 c11ism(343); 1449 $$.has_dim = true; 1450 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1451 } 1452 | type_qualifier { 1453 /* C11 6.7.6.2 */ 1454 if (!$1.tq_restrict) 1455 yyerror("Bad attribute"); 1456 $$.has_dim = true; 1457 $$.dim = 0; 1458 } 1459 | constant_expression { 1460 $$.has_dim = true; 1461 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1462 } 1463 ; 1464 1465 identifier_list: /* C99 6.7.5 */ 1466 T_NAME { 1467 $$ = old_style_function_parameter_name(getsym($1)); 1468 } 1469 | identifier_list T_COMMA T_NAME { 1470 $$ = concat_symbols($1, 1471 old_style_function_parameter_name(getsym($3))); 1472 } 1473 | identifier_list error 1474 ; 1475 1476 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1477 type_name: /* C99 6.7.6 */ 1478 { 1479 begin_declaration_level(DLK_ABSTRACT); 1480 } abstract_declaration { 1481 end_declaration_level(); 1482 $$ = $2->s_type; 1483 } 1484 ; 1485 1486 abstract_declaration: /* specific to lint */ 1487 begin_type_qualifier_list end_type { 1488 $$ = declare_abstract_type(abstract_name()); 1489 } 1490 | begin_type_specifier_qualifier_list end_type { 1491 $$ = declare_abstract_type(abstract_name()); 1492 } 1493 | begin_type_qualifier_list end_type abstract_declarator { 1494 $$ = declare_abstract_type($3); 1495 } 1496 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1497 $$ = declare_abstract_type($3); 1498 } 1499 ; 1500 1501 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1502 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1503 abstract_declarator: 1504 pointer { 1505 $$ = add_pointer(abstract_name(), $1); 1506 } 1507 | direct_abstract_declarator 1508 | pointer direct_abstract_declarator { 1509 $$ = add_pointer($2, $1); 1510 } 1511 | type_attribute_list direct_abstract_declarator { 1512 $$ = $2; 1513 } 1514 | pointer type_attribute_list direct_abstract_declarator { 1515 $$ = add_pointer($3, $1); 1516 } 1517 ; 1518 1519 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1520 direct_abstract_declarator: 1521 /* TODO: sort rules according to C99 */ 1522 T_LPAREN abstract_declarator T_RPAREN { 1523 $$ = $2; 1524 } 1525 | T_LBRACK array_size_opt T_RBRACK { 1526 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1527 } 1528 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1529 $$ = add_array($1, $3.has_dim, $3.dim); 1530 } 1531 | abstract_decl_param_list asm_or_symbolrename_opt { 1532 sym_t *name = abstract_enclosing_name(); 1533 $$ = add_function(symbolrename(name, $2), $1); 1534 end_declaration_level(); 1535 block_level--; 1536 } 1537 | direct_abstract_declarator abstract_decl_param_list 1538 asm_or_symbolrename_opt { 1539 $$ = add_function(symbolrename($1, $3), $2); 1540 end_declaration_level(); 1541 block_level--; 1542 } 1543 | direct_abstract_declarator type_attribute_list 1544 ; 1545 1546 abstract_decl_param_list: /* specific to lint */ 1547 abstract_decl_lparen T_RPAREN type_attribute_opt { 1548 $$ = (parameter_list){ .first = NULL }; 1549 } 1550 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1551 type_attribute_opt { 1552 $$ = $2; 1553 $$.prototype = true; 1554 } 1555 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1556 $$ = (parameter_list){ .first = NULL }; 1557 } 1558 ; 1559 1560 abstract_decl_lparen: /* specific to lint */ 1561 T_LPAREN { 1562 block_level++; 1563 begin_declaration_level(DLK_PROTO_PARAMS); 1564 } 1565 ; 1566 1567 vararg_parameter_type_list: /* specific to lint */ 1568 parameter_type_list 1569 | parameter_type_list T_COMMA T_ELLIPSIS { 1570 $$ = $1; 1571 $$.vararg = true; 1572 } 1573 | T_ELLIPSIS { 1574 /* TODO: C99 6.7.5 makes this an error as well. */ 1575 if (!allow_trad && !allow_c99) 1576 /* C90 to C17 require formal parameter before '...' */ 1577 error(84); 1578 else if (allow_c90) 1579 /* C90 to C17 require formal parameter before '...' */ 1580 warning(84); 1581 $$ = (parameter_list){ .vararg = true }; 1582 } 1583 ; 1584 1585 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1586 parameter_type_list: 1587 parameter_declaration { 1588 $$ = (parameter_list){ .first = $1 }; 1589 } 1590 | parameter_type_list T_COMMA parameter_declaration { 1591 $$ = $1; 1592 $$.first = concat_symbols($1.first, $3); 1593 } 1594 ; 1595 1596 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1597 parameter_declaration: 1598 begin_type_declmods end_type { 1599 /* ^^ There is no check for the missing type-specifier. */ 1600 $$ = declare_parameter(abstract_name(), false); 1601 } 1602 | begin_type_declaration_specifiers end_type { 1603 $$ = declare_parameter(abstract_name(), false); 1604 } 1605 | begin_type_declmods end_type notype_param_declarator { 1606 /* ^^ There is no check for the missing type-specifier. */ 1607 $$ = declare_parameter($3, false); 1608 } 1609 /* 1610 * type_param_declarator is needed because of following conflict: 1611 * "typedef int a; f(int (a));" could be parsed as 1612 * "function with argument a of type int", or 1613 * "function with an unnamed (abstract) argument of type function". 1614 * This grammar realizes the second case. 1615 */ 1616 | begin_type_declaration_specifiers end_type type_param_declarator { 1617 $$ = declare_parameter($3, false); 1618 } 1619 | begin_type_declmods end_type abstract_declarator { 1620 /* ^^ There is no check for the missing type-specifier. */ 1621 $$ = declare_parameter($3, false); 1622 } 1623 | begin_type_declaration_specifiers end_type abstract_declarator { 1624 $$ = declare_parameter($3, false); 1625 } 1626 ; 1627 1628 braced_initializer: 1629 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1630 init_lbrace init_rbrace { 1631 /* empty initializer braces require C23 or later */ 1632 c23ism(353); 1633 } 1634 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1635 | init_lbrace initializer_list init_rbrace 1636 | init_lbrace initializer_list T_COMMA init_rbrace 1637 ; 1638 1639 initializer: /* C99 6.7.8 "Initialization" */ 1640 assignment_expression { 1641 init_expr($1); 1642 } 1643 | init_lbrace init_rbrace { 1644 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1645 } 1646 | init_lbrace initializer_list init_rbrace 1647 | init_lbrace initializer_list T_COMMA init_rbrace 1648 /* XXX: What is this error handling for? */ 1649 | error 1650 ; 1651 1652 initializer_list: /* C99 6.7.8 "Initialization" */ 1653 initializer 1654 | designation initializer 1655 | initializer_list T_COMMA initializer 1656 | initializer_list T_COMMA designation initializer 1657 ; 1658 1659 designation: /* C99 6.7.8 "Initialization" */ 1660 { 1661 begin_designation(); 1662 } designator_list T_ASSIGN 1663 | identifier T_COLON { 1664 /* GCC style struct or union member name in initializer */ 1665 gnuism(315); 1666 begin_designation(); 1667 add_designator_member($1); 1668 } 1669 ; 1670 1671 designator_list: /* C99 6.7.8 "Initialization" */ 1672 designator 1673 | designator_list designator 1674 ; 1675 1676 designator: /* C99 6.7.8 "Initialization" */ 1677 T_LBRACK range T_RBRACK { 1678 if (!allow_c99) 1679 /* array initializer with designators is a C99 ... */ 1680 warning(321); 1681 add_designator_subscript($2); 1682 } 1683 | T_POINT identifier { 1684 if (!allow_c99) 1685 /* struct or union member name in initializer is ... */ 1686 warning(313); 1687 add_designator_member($2); 1688 } 1689 ; 1690 1691 static_assert_declaration: 1692 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1693 T_RPAREN T_SEMI { 1694 /* '_Static_assert' requires C11 or later */ 1695 c11ism(354); 1696 } 1697 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1698 /* '_Static_assert' without message requires C23 or later */ 1699 c23ism(355); 1700 } 1701 ; 1702 1703 range: 1704 constant_expression { 1705 $$.lo = to_int_constant($1, true); 1706 $$.hi = $$.lo; 1707 } 1708 | constant_expression T_ELLIPSIS constant_expression { 1709 $$.lo = to_int_constant($1, true); 1710 $$.hi = to_int_constant($3, true); 1711 /* initialization with '[a...b]' is a GCC extension */ 1712 gnuism(340); 1713 } 1714 ; 1715 1716 init_lbrace: /* helper */ 1717 T_LBRACE { 1718 init_lbrace(); 1719 } 1720 ; 1721 1722 init_rbrace: /* helper */ 1723 T_RBRACE { 1724 init_rbrace(); 1725 } 1726 ; 1727 1728 asm_or_symbolrename_opt: /* GCC extensions */ 1729 /* empty */ { 1730 $$ = NULL; 1731 } 1732 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1733 freeyyv(&$3, T_STRING); 1734 $$ = NULL; 1735 } 1736 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1737 gcc_attribute_specifier_list_opt { 1738 $$ = $3; 1739 } 1740 ; 1741 1742 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1743 statement: 1744 expression_statement 1745 | non_expr_statement 1746 ; 1747 1748 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1749 no_attr_statement: 1750 expression_statement 1751 | no_attr_non_expr_statement 1752 ; 1753 1754 non_expr_statement: /* helper for C99 6.8 */ 1755 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1756 | no_attr_non_expr_statement 1757 ; 1758 1759 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1760 no_attr_non_expr_statement: 1761 labeled_statement 1762 | compound_statement 1763 | selection_statement 1764 | iteration_statement 1765 | jump_statement { 1766 suppress_fallthrough = false; 1767 } 1768 | asm_statement 1769 ; 1770 1771 labeled_statement: /* C99 6.8.1 */ 1772 label gcc_attribute_specifier_list_opt no_attr_statement 1773 ; 1774 1775 label: 1776 T_NAME T_COLON { 1777 set_sym_kind(SK_LABEL); 1778 named_label(getsym($1)); 1779 } 1780 | T_CASE constant_expression T_COLON { 1781 case_label($2); 1782 suppress_fallthrough = true; 1783 } 1784 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1785 /* XXX: We don't fill all cases */ 1786 case_label($2); 1787 suppress_fallthrough = true; 1788 } 1789 | T_DEFAULT T_COLON { 1790 default_label(); 1791 suppress_fallthrough = true; 1792 } 1793 ; 1794 1795 compound_statement: /* C99 6.8.2 */ 1796 compound_statement_lbrace compound_statement_rbrace 1797 | compound_statement_lbrace block_item_list compound_statement_rbrace 1798 ; 1799 1800 compound_statement_lbrace: 1801 T_LBRACE { 1802 block_level++; 1803 mem_block_level++; 1804 debug_step("%s: mem_block_level = %zu", 1805 "compound_statement_lbrace", mem_block_level); 1806 begin_declaration_level(DLK_AUTO); 1807 } 1808 ; 1809 1810 compound_statement_rbrace: 1811 T_RBRACE { 1812 end_declaration_level(); 1813 if (!in_statement_expr()) 1814 level_free_all(mem_block_level); /* leak */ 1815 mem_block_level--; 1816 debug_step("%s: mem_block_level = %zu", 1817 "compound_statement_rbrace", mem_block_level); 1818 block_level--; 1819 suppress_fallthrough = false; 1820 } 1821 ; 1822 1823 block_item_list: /* C99 6.8.2 */ 1824 block_item 1825 | block_item_list block_item { 1826 if ($1 && !$2) 1827 /* declarations after statements is a C99 feature */ 1828 c99ism(327); 1829 $$ = $1 || $2; 1830 } 1831 ; 1832 1833 block_item: /* C99 6.8.2 */ 1834 declaration_or_error { 1835 $$ = false; 1836 restore_warning_flags(); 1837 } 1838 | statement { 1839 $$ = true; 1840 restore_warning_flags(); 1841 } 1842 ; 1843 1844 expression_statement: /* C99 6.8.3 */ 1845 expression T_SEMI { 1846 expr($1, false, false, false, false); 1847 suppress_fallthrough = false; 1848 } 1849 | T_SEMI { 1850 check_statement_reachable(); 1851 suppress_fallthrough = false; 1852 } 1853 ; 1854 1855 selection_statement: /* C99 6.8.4 */ 1856 if_without_else %prec T_THEN { 1857 save_warning_flags(); 1858 stmt_if_then_stmt(); 1859 stmt_if_else_stmt(false); 1860 } 1861 | if_without_else T_ELSE { 1862 save_warning_flags(); 1863 stmt_if_then_stmt(); 1864 } statement { 1865 clear_warning_flags(); 1866 stmt_if_else_stmt(true); 1867 } 1868 | if_without_else T_ELSE error { 1869 clear_warning_flags(); 1870 stmt_if_else_stmt(false); 1871 } 1872 | switch_expr statement { 1873 clear_warning_flags(); 1874 stmt_switch_expr_stmt(); 1875 } 1876 | switch_expr error { 1877 clear_warning_flags(); 1878 stmt_switch_expr_stmt(); 1879 } 1880 ; 1881 1882 if_without_else: /* see C99 6.8.4 */ 1883 if_expr statement 1884 | if_expr error 1885 ; 1886 1887 if_expr: /* see C99 6.8.4 */ 1888 T_IF T_LPAREN expression T_RPAREN { 1889 stmt_if_expr($3); 1890 clear_warning_flags(); 1891 } 1892 ; 1893 1894 switch_expr: /* see C99 6.8.4 */ 1895 T_SWITCH T_LPAREN expression T_RPAREN { 1896 stmt_switch_expr($3); 1897 clear_warning_flags(); 1898 } 1899 ; 1900 1901 iteration_statement: /* C99 6.8.5 */ 1902 while_expr statement { 1903 clear_warning_flags(); 1904 stmt_while_expr_stmt(); 1905 } 1906 | while_expr error { 1907 clear_warning_flags(); 1908 stmt_while_expr_stmt(); 1909 } 1910 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1911 stmt_do_while_expr($4); 1912 suppress_fallthrough = false; 1913 } 1914 | do error { 1915 clear_warning_flags(); 1916 stmt_do_while_expr(NULL); 1917 } 1918 | for_exprs statement { 1919 clear_warning_flags(); 1920 stmt_for_exprs_stmt(); 1921 end_declaration_level(); 1922 block_level--; 1923 } 1924 | for_exprs error { 1925 clear_warning_flags(); 1926 stmt_for_exprs_stmt(); 1927 end_declaration_level(); 1928 block_level--; 1929 } 1930 ; 1931 1932 while_expr: /* see C99 6.8.5 */ 1933 T_WHILE T_LPAREN expression T_RPAREN { 1934 stmt_while_expr($3); 1935 clear_warning_flags(); 1936 } 1937 ; 1938 1939 do_statement: /* see C99 6.8.5 */ 1940 do statement { 1941 clear_warning_flags(); 1942 } 1943 ; 1944 1945 do: /* see C99 6.8.5 */ 1946 T_DO { 1947 stmt_do(); 1948 } 1949 ; 1950 1951 for_start: /* see C99 6.8.5 */ 1952 T_FOR T_LPAREN { 1953 begin_declaration_level(DLK_AUTO); 1954 block_level++; 1955 } 1956 ; 1957 1958 for_exprs: /* see C99 6.8.5 */ 1959 for_start 1960 begin_type_declaration_specifiers end_type 1961 notype_init_declarators T_SEMI 1962 expression_opt T_SEMI 1963 expression_opt T_RPAREN { 1964 /* variable declaration in for loop */ 1965 c99ism(325); 1966 stmt_for_exprs(NULL, $6, $8); 1967 clear_warning_flags(); 1968 } 1969 | for_start 1970 expression_opt T_SEMI 1971 expression_opt T_SEMI 1972 expression_opt T_RPAREN { 1973 stmt_for_exprs($2, $4, $6); 1974 clear_warning_flags(); 1975 } 1976 ; 1977 1978 jump_statement: /* C99 6.8.6 */ 1979 goto identifier T_SEMI { 1980 stmt_goto(getsym($2)); 1981 } 1982 | goto error T_SEMI { 1983 set_sym_kind(SK_VCFT); 1984 } 1985 | T_CONTINUE T_SEMI { 1986 stmt_continue(); 1987 } 1988 | T_BREAK T_SEMI { 1989 stmt_break(); 1990 } 1991 | T_RETURN sys T_SEMI { 1992 stmt_return($2, NULL); 1993 } 1994 | T_RETURN sys expression T_SEMI { 1995 stmt_return($2, $3); 1996 } 1997 ; 1998 1999 goto: /* see C99 6.8.6 */ 2000 T_GOTO { 2001 set_sym_kind(SK_LABEL); 2002 } 2003 ; 2004 2005 asm_statement: /* GCC extension */ 2006 T_ASM T_LPAREN read_until_rparen T_SEMI { 2007 dcs_set_asm(); 2008 } 2009 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2010 dcs_set_asm(); 2011 } 2012 | T_ASM error 2013 ; 2014 2015 read_until_rparen: /* helper for 'asm_statement' */ 2016 /* empty */ { 2017 read_until_rparen(); 2018 } 2019 ; 2020 2021 translation_unit: /* C99 6.9 */ 2022 external_declaration 2023 | translation_unit external_declaration 2024 ; 2025 2026 external_declaration: /* C99 6.9 */ 2027 function_definition { 2028 global_clean_up_decl(false); 2029 clear_warning_flags(); 2030 } 2031 | top_level_declaration { 2032 global_clean_up_decl(false); 2033 clear_warning_flags(); 2034 } 2035 | asm_statement /* GCC extension */ 2036 | T_SEMI { /* GCC extension */ 2037 /* 2038 * TODO: Only allow this in GCC mode, not in plain C99. 2039 * This is one of the top 10 warnings in the NetBSD build. 2040 */ 2041 if (!allow_trad && !allow_c99) 2042 /* empty declaration */ 2043 error(0); 2044 else if (allow_c90) 2045 /* empty declaration */ 2046 warning(0); 2047 } 2048 ; 2049 2050 /* 2051 * On the top level, lint allows several forms of declarations that it doesn't 2052 * allow in functions. For example, a single ';' is an empty declaration and 2053 * is supported by some compilers, but in a function it would be an empty 2054 * statement, not a declaration. This makes a difference in C90 mode, where 2055 * a statement must not be followed by a declaration. 2056 * 2057 * See 'declaration' for all other declarations. 2058 */ 2059 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2060 begin_type end_type notype_init_declarators T_SEMI { 2061 /* TODO: Make this an error in C99 mode as well. */ 2062 if (!allow_trad && !allow_c99) 2063 /* old-style declaration; add 'int' */ 2064 error(1); 2065 else if (allow_c90) 2066 /* old-style declaration; add 'int' */ 2067 warning(1); 2068 } 2069 | declaration 2070 | error T_SEMI { 2071 global_clean_up(); 2072 } 2073 | error T_RBRACE { 2074 global_clean_up(); 2075 } 2076 ; 2077 2078 function_definition: /* C99 6.9.1 */ 2079 func_declarator { 2080 if ($1->s_type->t_tspec != FUNC) { 2081 /* syntax error '%s' */ 2082 error(249, yytext); 2083 YYERROR; 2084 } 2085 if ($1->s_type->t_typedef) { 2086 /* ()-less function definition */ 2087 error(64); 2088 YYERROR; 2089 } 2090 check_extern_declaration($1); 2091 begin_function($1); 2092 block_level++; 2093 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2094 if (lwarn == LWARN_NONE) 2095 $1->s_used = true; 2096 } arg_declaration_list_opt { 2097 end_declaration_level(); 2098 block_level--; 2099 check_func_lint_directives(); 2100 check_func_old_style_parameters(); 2101 begin_control_statement(CS_FUNCTION_BODY); 2102 } compound_statement { 2103 end_function(); 2104 end_control_statement(CS_FUNCTION_BODY); 2105 } 2106 ; 2107 2108 func_declarator: 2109 begin_type end_type notype_declarator { 2110 if (!allow_trad) 2111 /* old-style declaration; add 'int' */ 2112 error(1); 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 $$ = $3; 2120 } 2121 | begin_type_declaration_specifiers end_type type_declarator { 2122 $$ = $3; 2123 } 2124 ; 2125 2126 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2127 /* empty */ 2128 | arg_declaration_list 2129 ; 2130 2131 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2132 arg_declaration 2133 | arg_declaration_list arg_declaration 2134 /* XXX or better "arg_declaration error" ? */ 2135 | error 2136 ; 2137 2138 /* 2139 * "arg_declaration" is separated from "declaration" because it 2140 * needs other error handling. 2141 */ 2142 arg_declaration: 2143 begin_type_declmods end_type T_SEMI { 2144 /* empty declaration */ 2145 warning(2); 2146 } 2147 | begin_type_declmods end_type notype_init_declarators T_SEMI 2148 | begin_type_declaration_specifiers end_type T_SEMI { 2149 if (!dcs->d_nonempty_decl) 2150 /* empty declaration */ 2151 warning(2); 2152 else 2153 /* '%s' declared in parameter declaration list */ 2154 warning(3, type_name(dcs->d_type)); 2155 } 2156 | begin_type_declaration_specifiers end_type 2157 type_init_declarators T_SEMI { 2158 if (dcs->d_nonempty_decl) 2159 /* '%s' declared in parameter declaration list */ 2160 warning(3, type_name(dcs->d_type)); 2161 } 2162 | begin_type_declmods error 2163 | begin_type_declaration_specifiers error 2164 ; 2165 2166 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2167 gcc_attribute_specifier_list_opt: 2168 /* empty */ 2169 | gcc_attribute_specifier_list 2170 ; 2171 2172 gcc_attribute_specifier_list: 2173 gcc_attribute_specifier 2174 | gcc_attribute_specifier_list gcc_attribute_specifier 2175 ; 2176 2177 gcc_attribute_specifier: 2178 T_ATTRIBUTE T_LPAREN T_LPAREN { 2179 in_gcc_attribute = true; 2180 } gcc_attribute_list { 2181 in_gcc_attribute = false; 2182 } T_RPAREN T_RPAREN 2183 ; 2184 2185 gcc_attribute_list: 2186 gcc_attribute 2187 | gcc_attribute_list T_COMMA gcc_attribute 2188 ; 2189 2190 gcc_attribute: 2191 /* empty */ 2192 | T_NAME { 2193 const char *name = $1->sb_name; 2194 if (is_either(name, "packed", "__packed__")) 2195 dcs_add_packed(); 2196 else if (is_either(name, "used", "__used__") || 2197 is_either(name, "unused", "__unused__")) 2198 dcs_set_used(); 2199 else if (is_either(name, "fallthrough", "__fallthrough__")) 2200 suppress_fallthrough = true; 2201 } 2202 | T_NAME T_LPAREN T_RPAREN 2203 | T_NAME T_LPAREN argument_expression_list T_RPAREN { 2204 const char *name = $1->sb_name; 2205 if (is_either(name, "aligned", "__aligned__") 2206 && $3->args_len == 1) 2207 dcs_add_alignas($3->args[0]); 2208 } 2209 | type_qualifier { 2210 if (!$1.tq_const) 2211 yyerror("Bad attribute"); 2212 } 2213 ; 2214 2215 sys: 2216 /* empty */ { 2217 $$ = in_system_header; 2218 } 2219 ; 2220 2221 %% 2222 2223 /* ARGSUSED */ 2224 int 2225 yyerror(const char *msg) 2226 { 2227 /* syntax error '%s' */ 2228 error(249, yytext); 2229 if (++sytxerr >= 5) 2230 norecover(); 2231 return 0; 2232 } 2233 2234 #if YYDEBUG && YYBYACC 2235 static const char * 2236 cgram_to_string(int token, YYSTYPE val) 2237 { 2238 2239 switch (token) { 2240 case T_INCDEC: 2241 return val.y_inc ? "++" : "--"; 2242 case T_MULTIPLICATIVE: 2243 case T_ADDITIVE: 2244 case T_SHIFT: 2245 case T_RELATIONAL: 2246 case T_EQUALITY: 2247 case T_OPASSIGN: 2248 return op_name(val.y_op); 2249 case T_SCLASS: 2250 return scl_name(val.y_scl); 2251 case T_TYPE: 2252 case T_STRUCT_OR_UNION: 2253 return tspec_name(val.y_tspec); 2254 case T_QUAL: 2255 return type_qualifiers_string(val.y_type_qualifiers); 2256 case T_FUNCTION_SPECIFIER: 2257 return function_specifier_name(val.y_function_specifier); 2258 case T_NAME: 2259 return val.y_name->sb_name; 2260 default: 2261 return "<none>"; 2262 } 2263 } 2264 #endif 2265 2266 static void 2267 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2268 { 2269 declare(decl, has_initializer, renaming); 2270 if (renaming != NULL) 2271 freeyyv(&renaming, T_NAME); 2272 } 2273 2274 /* 2275 * Discard all input tokens up to and including the next unmatched right 2276 * parenthesis. 2277 */ 2278 static void 2279 read_until_rparen(void) 2280 { 2281 int level; 2282 2283 if (yychar < 0) 2284 yychar = yylex(); 2285 freeyyv(&yylval, yychar); 2286 2287 level = 1; 2288 while (yychar > 0) { 2289 if (yychar == T_LPAREN) 2290 level++; 2291 if (yychar == T_RPAREN && --level == 0) 2292 break; 2293 freeyyv(&yylval, yychar = yylex()); 2294 } 2295 2296 yyclearin; 2297 } 2298 2299 static sym_t * 2300 symbolrename(sym_t *s, sbuf_t *sb) 2301 { 2302 if (sb != NULL) 2303 s->s_rename = sb->sb_name; 2304 return s; 2305 } 2306
Indexes created Fri Oct 03 02:09:57 GMT 2025