cgram.y revision 1.492
1 %{ 2 /* $NetBSD: cgram.y,v 1.492 2024/03/27 21:14:09 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 1.492 2024/03/27 21:14:09 rillig Exp $"); 39 #endif 40 41 #include <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint1.h" 46 47 extern char *yytext; 48 49 /* 50 * Contains the level of current declaration, used for symbol table entries. 51 * 0 is the top-level, > 0 is inside a function body. 52 */ 53 int block_level; 54 55 /* 56 * level for memory allocation. Normally the same as block_level. 57 * An exception is the declaration of parameters in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 89 saved_lwarn = lwarn; 90 } 91 92 /* ARGSUSED */ 93 static void 94 restore_warning_flags_loc(const char *file, size_t line) 95 { 96 if (saved_lwarn != LWARN_NOTHING_SAVED) { 97 lwarn = saved_lwarn; 98 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 99 } else 100 clear_warning_flags_loc(file, line); 101 } 102 103 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 104 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 105 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 106 107 static bool 108 is_either(const char *s, const char *a, const char *b) 109 { 110 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 111 } 112 113 #if YYDEBUG && YYBYACC 114 #define YYSTYPE_TOSTRING cgram_to_string 115 #endif 116 117 %} 118 119 %expect 103 120 121 %union { 122 val_t *y_val; 123 sbuf_t *y_name; 124 sym_t *y_sym; 125 bool y_inc; 126 op_t y_op; 127 scl_t y_scl; 128 tspec_t y_tspec; 129 type_qualifiers y_type_qualifiers; 130 function_specifier y_function_specifier; 131 parameter_list y_parameter_list; 132 function_call *y_arguments; 133 type_t *y_type; 134 tnode_t *y_tnode; 135 range_t y_range; 136 buffer *y_string; 137 qual_ptr *y_qual_ptr; 138 bool y_seen_statement; 139 struct generic_association *y_generic; 140 array_size y_array_size; 141 bool y_in_system_header; 142 designation y_designation; 143 }; 144 145 /* for Bison: 146 %printer { 147 if (is_integer($$->v_tspec)) 148 fprintf(yyo, "%lld", (long long)$$->u.integer); 149 else 150 fprintf(yyo, "%Lg", $$->u.floating); 151 } <y_val> 152 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 153 %printer { 154 bool indented = debug_push_indented(true); 155 debug_sym("", $$, ""); 156 debug_pop_indented(indented); 157 } <y_sym> 158 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 159 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 160 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 161 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 162 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 163 %printer { 164 fprintf(yyo, "%s", function_specifier_name($$)); 165 } <y_function_specifier> 166 %printer { 167 size_t n = 0; 168 for (const sym_t *p = $$.first; p != NULL; p = p->s_next) 169 n++; 170 fprintf(yyo, "%zu parameter%s", n, n != 1 ? "s" : ""); 171 } <y_parameter_list> 172 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 173 %printer { 174 if ($$ == NULL) 175 fprintf(yyo, "<null>"); 176 else 177 fprintf(yyo, "%s '%s'", 178 op_name($$->tn_op), type_name($$->tn_type)); 179 } <y_tnode> 180 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 181 %printer { fprintf(yyo, "length %zu", $$->len); } <y_string> 182 %printer { 183 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 184 } <y_qual_ptr> 185 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 186 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 187 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 188 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 189 %printer { 190 if ($$.dn_len == 0) 191 fprintf(yyo, "(empty)"); 192 for (size_t i = 0; i < $$.dn_len; i++) { 193 const designator *dr = $$.dn_items + i; 194 if (dr->dr_kind == DK_MEMBER) 195 fprintf(yyo, ".%s", dr->dr_member->s_name); 196 else if (dr->dr_kind == DK_SUBSCRIPT) 197 fprintf(yyo, "[%zu]", dr->dr_subscript); 198 else 199 fprintf(yyo, "<scalar>"); 200 } 201 } <y_designation> 202 */ 203 204 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 205 %token T_POINT T_ARROW 206 %token T_COMPLEMENT T_LOGNOT 207 %token <y_inc> T_INCDEC 208 %token T_SIZEOF 209 %token T_BUILTIN_OFFSETOF 210 %token T_TYPEOF 211 %token T_EXTENSION 212 %token T_ALIGNAS 213 %token T_ALIGNOF 214 %token T_ASTERISK 215 %token <y_op> T_MULTIPLICATIVE 216 %token <y_op> T_ADDITIVE 217 %token <y_op> T_SHIFT 218 %token <y_op> T_RELATIONAL 219 %token <y_op> T_EQUALITY 220 %token T_AMPER 221 %token T_BITXOR 222 %token T_BITOR 223 %token T_LOGAND 224 %token T_LOGOR 225 %token T_QUEST 226 %token T_COLON 227 %token T_ASSIGN 228 %token <y_op> T_OPASSIGN 229 %token T_COMMA 230 %token T_SEMI 231 %token T_ELLIPSIS 232 %token T_REAL 233 %token T_IMAG 234 %token T_GENERIC 235 236 /* storage classes (extern, static, auto, register and typedef) */ 237 %token <y_scl> T_SCLASS 238 %token <y_function_specifier> T_FUNCTION_SPECIFIER 239 240 /* 241 * predefined type keywords (char, int, short, long, unsigned, signed, 242 * float, double, void); see T_TYPENAME for types from typedef 243 */ 244 %token <y_tspec> T_TYPE 245 246 %token <y_type_qualifiers> T_QUAL 247 %token <y_type_qualifiers> T_ATOMIC 248 249 /* struct or union */ 250 %token <y_tspec> T_STRUCT_OR_UNION 251 252 /* remaining keywords */ 253 %token T_ASM 254 %token T_BREAK 255 %token T_CASE 256 %token T_CONTINUE 257 %token T_DEFAULT 258 %token T_DO 259 %token T_ELSE 260 %token T_ENUM 261 %token T_FOR 262 %token T_GOTO 263 %token T_IF 264 %token T_PACKED 265 %token T_RETURN 266 %token T_SWITCH 267 %token T_SYMBOLRENAME 268 %token T_WHILE 269 %token T_STATIC_ASSERT 270 271 %token T_ATTRIBUTE 272 273 %left T_THEN 274 %left T_ELSE 275 %right T_QUEST T_COLON 276 %left T_LOGOR 277 %left T_LOGAND 278 %left T_BITOR 279 %left T_BITXOR 280 %left T_AMPER 281 %left T_EQUALITY 282 %left T_RELATIONAL 283 %left T_SHIFT 284 %left T_ADDITIVE 285 %left T_ASTERISK T_MULTIPLICATIVE 286 287 %token <y_name> T_NAME 288 %token <y_name> T_TYPENAME 289 %token <y_val> T_CON 290 %token <y_string> T_STRING 291 292 /* No type for program. */ 293 %type <y_sym> identifier_sym 294 %type <y_name> identifier 295 %type <y_string> string 296 %type <y_tnode> primary_expression 297 %type <y_designation> member_designator 298 %type <y_tnode> generic_selection 299 %type <y_generic> generic_assoc_list 300 %type <y_generic> generic_association 301 %type <y_tnode> postfix_expression 302 %type <y_tnode> gcc_statement_expr_list 303 %type <y_tnode> gcc_statement_expr_item 304 %type <y_op> point_or_arrow 305 %type <y_arguments> argument_expression_list 306 %type <y_tnode> unary_expression 307 %type <y_tnode> cast_expression 308 %type <y_tnode> expression_opt 309 %type <y_tnode> conditional_expression 310 %type <y_tnode> assignment_expression 311 %type <y_tnode> expression 312 %type <y_tnode> constant_expression 313 /* No type for declaration_or_error. */ 314 /* No type for declaration. */ 315 /* No type for begin_type_declaration_specifiers. */ 316 /* No type for begin_type_declmods. */ 317 /* No type for begin_type_specifier_qualifier_list. */ 318 /* No type for begin_type_specifier_qualifier_list_postfix. */ 319 %type <y_type> begin_type_typespec 320 /* No type for begin_type_qualifier_list. */ 321 /* No type for declmod. */ 322 /* No type for type_attribute_list_opt. */ 323 /* No type for type_attribute_list. */ 324 /* No type for type_attribute_opt. */ 325 /* No type for type_attribute. */ 326 /* No type for begin_type. */ 327 /* No type for end_type. */ 328 %type <y_type> type_specifier 329 %type <y_type> notype_type_specifier 330 %type <y_type> atomic_type_specifier 331 %type <y_type> struct_or_union_specifier 332 %type <y_tspec> struct_or_union 333 %type <y_sym> braced_member_declaration_list 334 %type <y_sym> member_declaration_list_with_rbrace 335 %type <y_sym> member_declaration_list 336 %type <y_sym> member_declaration 337 %type <y_sym> notype_member_declarators 338 %type <y_sym> type_member_declarators 339 %type <y_sym> notype_member_declarator 340 %type <y_sym> type_member_declarator 341 %type <y_type> enum_specifier 342 /* No type for enum. */ 343 %type <y_sym> enum_declaration 344 %type <y_sym> enums_with_opt_comma 345 %type <y_sym> enumerator_list 346 %type <y_sym> enumerator 347 %type <y_type_qualifiers> type_qualifier 348 /* No type for atomic. */ 349 %type <y_qual_ptr> pointer 350 %type <y_type_qualifiers> type_qualifier_list_opt 351 %type <y_type_qualifiers> type_qualifier_list 352 /* No type for notype_init_declarators. */ 353 /* No type for type_init_declarators. */ 354 /* No type for notype_init_declarator. */ 355 /* No type for type_init_declarator. */ 356 %type <y_sym> notype_declarator 357 %type <y_sym> type_declarator 358 %type <y_sym> notype_direct_declarator 359 %type <y_sym> type_direct_declarator 360 %type <y_sym> type_param_declarator 361 %type <y_sym> notype_param_declarator 362 %type <y_sym> direct_param_declarator 363 %type <y_sym> direct_notype_param_declarator 364 %type <y_parameter_list> param_list 365 %type <y_array_size> array_size_opt 366 %type <y_sym> identifier_list 367 %type <y_type> type_name 368 %type <y_sym> abstract_declaration 369 %type <y_sym> abstract_declarator 370 %type <y_sym> direct_abstract_declarator 371 %type <y_parameter_list> abstract_decl_param_list 372 /* No type for abstract_decl_lparen. */ 373 %type <y_parameter_list> vararg_parameter_type_list 374 %type <y_parameter_list> parameter_type_list 375 %type <y_sym> parameter_declaration 376 /* No type for braced_initializer. */ 377 /* No type for initializer. */ 378 /* No type for initializer_list. */ 379 /* No type for designation. */ 380 /* No type for designator_list. */ 381 /* No type for designator. */ 382 /* No type for static_assert_declaration. */ 383 %type <y_range> range 384 /* No type for init_lbrace. */ 385 /* No type for init_rbrace. */ 386 %type <y_name> asm_or_symbolrename_opt 387 /* No type for statement. */ 388 /* No type for no_attr_statement. */ 389 /* No type for non_expr_statement. */ 390 /* No type for no_attr_non_expr_statement. */ 391 /* No type for labeled_statement. */ 392 /* No type for label. */ 393 /* No type for compound_statement. */ 394 /* No type for compound_statement_lbrace. */ 395 /* No type for compound_statement_rbrace. */ 396 %type <y_seen_statement> block_item_list 397 %type <y_seen_statement> block_item 398 /* No type for expression_statement. */ 399 /* No type for selection_statement. */ 400 /* No type for if_without_else. */ 401 /* No type for if_expr. */ 402 /* No type for switch_expr. */ 403 /* No type for iteration_statement. */ 404 /* No type for while_expr. */ 405 /* No type for do_statement. */ 406 /* No type for do. */ 407 /* No type for for_start. */ 408 /* No type for for_exprs. */ 409 /* No type for jump_statement. */ 410 /* No type for goto. */ 411 /* No type for asm_statement. */ 412 /* No type for read_until_rparen. */ 413 /* No type for translation_unit. */ 414 /* No type for external_declaration. */ 415 /* No type for top_level_declaration. */ 416 /* No type for function_definition. */ 417 %type <y_sym> func_declarator 418 /* No type for arg_declaration_list_opt. */ 419 /* No type for arg_declaration_list. */ 420 /* No type for arg_declaration. */ 421 /* No type for gcc_attribute_specifier_list_opt. */ 422 /* No type for gcc_attribute_specifier_list. */ 423 /* No type for gcc_attribute_specifier. */ 424 /* No type for gcc_attribute_list. */ 425 /* No type for gcc_attribute. */ 426 /* No type for gcc_attribute_parameters. */ 427 %type <y_in_system_header> sys 428 429 %% 430 431 program: 432 /* empty */ { 433 /* TODO: Make this an error in C99 mode as well. */ 434 if (!allow_trad && !allow_c99) 435 /* empty translation unit */ 436 error(272); 437 else if (allow_c90) 438 /* empty translation unit */ 439 warning(272); 440 } 441 | translation_unit 442 ; 443 444 identifier_sym: /* helper for struct/union/enum */ 445 identifier { 446 $$ = getsym($1); 447 } 448 ; 449 450 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 451 identifier: 452 T_NAME { 453 debug_step("cgram: name '%s'", $1->sb_name); 454 $$ = $1; 455 } 456 | T_TYPENAME { 457 debug_step("cgram: typename '%s'", $1->sb_name); 458 $$ = $1; 459 } 460 ; 461 462 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 463 string: 464 T_STRING 465 | string T_STRING { 466 if (!allow_c90) 467 /* concatenated strings are illegal in traditional C */ 468 warning(219); 469 $$ = cat_strings($1, $2); 470 } 471 ; 472 473 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 474 primary_expression: 475 T_NAME { 476 bool sys_name, sys_next; 477 sys_name = in_system_header; 478 if (yychar < 0) 479 yychar = yylex(); 480 sys_next = in_system_header; 481 in_system_header = sys_name; 482 $$ = build_name(getsym($1), yychar == T_LPAREN); 483 in_system_header = sys_next; 484 } 485 | T_CON { 486 $$ = build_constant(gettyp($1->v_tspec), $1); 487 } 488 | string { 489 $$ = build_string($1); 490 } 491 | T_LPAREN expression T_RPAREN { 492 if ($2 != NULL) 493 $2->tn_parenthesized = true; 494 $$ = $2; 495 } 496 | generic_selection 497 /* GCC primary-expression, see c_parser_postfix_expression */ 498 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 499 set_sym_kind(SK_MEMBER); 500 } member_designator T_RPAREN { 501 $$ = build_offsetof($3, $6); 502 } 503 ; 504 505 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 506 member_designator: 507 identifier { 508 $$ = (designation) { .dn_len = 0 }; 509 designation_push(&$$, DK_MEMBER, getsym($1), 0); 510 } 511 | member_designator T_LBRACK range T_RBRACK { 512 $$ = $1; 513 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 514 } 515 | member_designator T_POINT { 516 set_sym_kind(SK_MEMBER); 517 } identifier { 518 $$ = $1; 519 designation_push(&$$, DK_MEMBER, getsym($4), 0); 520 } 521 ; 522 523 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 524 generic_selection: 525 T_GENERIC T_LPAREN assignment_expression T_COMMA 526 generic_assoc_list T_RPAREN { 527 /* generic selection requires C11 or later */ 528 c11ism(345); 529 $$ = build_generic_selection($3, $5); 530 } 531 ; 532 533 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 534 generic_assoc_list: 535 generic_association 536 | generic_assoc_list T_COMMA generic_association { 537 $3->ga_prev = $1; 538 $$ = $3; 539 } 540 ; 541 542 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 543 generic_association: 544 type_name T_COLON assignment_expression { 545 $$ = block_zero_alloc(sizeof(*$$), "generic"); 546 $$->ga_arg = $1; 547 $$->ga_result = $3; 548 } 549 | T_DEFAULT T_COLON assignment_expression { 550 $$ = block_zero_alloc(sizeof(*$$), "generic"); 551 $$->ga_arg = NULL; 552 $$->ga_result = $3; 553 } 554 ; 555 556 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 557 postfix_expression: 558 primary_expression 559 | postfix_expression T_LBRACK sys expression T_RBRACK { 560 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 561 } 562 | postfix_expression T_LPAREN sys T_RPAREN { 563 function_call *call = 564 expr_zero_alloc(sizeof(*call), "function_call"); 565 $$ = build_function_call($1, $3, call); 566 } 567 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 568 $$ = build_function_call($1, $3, $4); 569 } 570 | postfix_expression point_or_arrow sys T_NAME { 571 $$ = build_member_access($1, $2, $3, $4); 572 } 573 | postfix_expression T_INCDEC sys { 574 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 575 } 576 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 577 sym_t *tmp = mktempsym($2); 578 begin_initialization(tmp); 579 cgram_declare(tmp, true, NULL); 580 } braced_initializer { 581 if (!allow_c99) 582 /* compound literals are a C99/GCC extension */ 583 gnuism(319); 584 $$ = build_name(current_initsym(), false); 585 end_initialization(); 586 } 587 | T_LPAREN compound_statement_lbrace { 588 begin_statement_expr(); 589 } gcc_statement_expr_list { 590 do_statement_expr($4); 591 } compound_statement_rbrace T_RPAREN { 592 $$ = end_statement_expr(); 593 } 594 ; 595 596 /* 597 * The inner part of a GCC statement-expression of the form ({ ... }). 598 * 599 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 600 */ 601 gcc_statement_expr_list: 602 gcc_statement_expr_item 603 | gcc_statement_expr_list gcc_statement_expr_item { 604 $$ = $2; 605 } 606 ; 607 608 gcc_statement_expr_item: 609 declaration_or_error { 610 clear_warning_flags(); 611 $$ = NULL; 612 } 613 | non_expr_statement { 614 $$ = expr_alloc_tnode(); 615 $$->tn_type = gettyp(VOID); 616 } 617 | T_SEMI { 618 $$ = expr_alloc_tnode(); 619 $$->tn_type = gettyp(VOID); 620 } 621 | expression T_SEMI { 622 if ($1 == NULL) { /* in case of syntax errors */ 623 $$ = expr_alloc_tnode(); 624 $$->tn_type = gettyp(VOID); 625 } else { 626 /* XXX: do that only on the last name */ 627 if ($1->tn_op == NAME) 628 $1->u.sym->s_used = true; 629 expr($1, false, false, false, false); 630 suppress_fallthrough = false; 631 $$ = $1; 632 } 633 } 634 ; 635 636 point_or_arrow: /* helper for 'postfix_expression' */ 637 T_POINT { 638 set_sym_kind(SK_MEMBER); 639 $$ = POINT; 640 } 641 | T_ARROW { 642 set_sym_kind(SK_MEMBER); 643 $$ = ARROW; 644 } 645 ; 646 647 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 648 argument_expression_list: 649 assignment_expression { 650 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 651 add_function_argument($$, $1); 652 } 653 | argument_expression_list T_COMMA assignment_expression { 654 $$ = $1; 655 add_function_argument($1, $3); 656 } 657 ; 658 659 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 660 unary_expression: 661 postfix_expression 662 | T_INCDEC sys unary_expression { 663 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 664 } 665 | T_AMPER sys cast_expression { 666 $$ = build_unary(ADDR, $2, $3); 667 } 668 | T_ASTERISK sys cast_expression { 669 $$ = build_unary(INDIR, $2, $3); 670 } 671 | T_ADDITIVE sys cast_expression { 672 if (!allow_c90 && $1 == PLUS) 673 /* unary '+' is illegal in traditional C */ 674 warning(100); 675 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 676 } 677 | T_COMPLEMENT sys cast_expression { 678 $$ = build_unary(COMPL, $2, $3); 679 } 680 | T_LOGNOT sys cast_expression { 681 $$ = build_unary(NOT, $2, $3); 682 } 683 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 684 $$ = build_unary(REAL, $2, $3); 685 } 686 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 687 $$ = build_unary(IMAG, $2, $3); 688 } 689 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 690 $$ = $2; 691 } 692 | T_SIZEOF unary_expression { 693 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 694 if ($$ != NULL) 695 check_expr_misc($2, 696 false, false, false, false, false, true); 697 } 698 | T_SIZEOF T_LPAREN type_name T_RPAREN { 699 $$ = build_sizeof($3); 700 } 701 | T_ALIGNOF unary_expression { 702 /* non type argument to alignof is a GCC extension */ 703 gnuism(349); 704 lint_assert($2 != NULL); 705 $$ = build_alignof($2->tn_type); 706 } 707 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 708 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 709 /* TODO: c11ism */ 710 $$ = build_alignof($3); 711 } 712 ; 713 714 /* The rule 'unary_operator' is inlined into unary_expression. */ 715 716 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 717 cast_expression: 718 unary_expression 719 | T_LPAREN type_name T_RPAREN sys cast_expression { 720 $$ = cast($5, $4, $2); 721 } 722 ; 723 724 expression_opt: 725 /* empty */ { 726 $$ = NULL; 727 } 728 | expression 729 ; 730 731 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 732 /* 'conditional_expression' also implements 'additive_expression'. */ 733 /* 'conditional_expression' also implements 'shift_expression'. */ 734 /* 'conditional_expression' also implements 'relational_expression'. */ 735 /* 'conditional_expression' also implements 'equality_expression'. */ 736 /* 'conditional_expression' also implements 'AND_expression'. */ 737 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 738 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 739 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 740 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 741 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 742 conditional_expression: 743 cast_expression 744 | conditional_expression T_ASTERISK sys conditional_expression { 745 $$ = build_binary($1, MULT, $3, $4); 746 } 747 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 748 $$ = build_binary($1, $2, $3, $4); 749 } 750 | conditional_expression T_ADDITIVE sys conditional_expression { 751 $$ = build_binary($1, $2, $3, $4); 752 } 753 | conditional_expression T_SHIFT sys conditional_expression { 754 $$ = build_binary($1, $2, $3, $4); 755 } 756 | conditional_expression T_RELATIONAL sys conditional_expression { 757 $$ = build_binary($1, $2, $3, $4); 758 } 759 | conditional_expression T_EQUALITY sys conditional_expression { 760 $$ = build_binary($1, $2, $3, $4); 761 } 762 | conditional_expression T_AMPER sys conditional_expression { 763 $$ = build_binary($1, BITAND, $3, $4); 764 } 765 | conditional_expression T_BITXOR sys conditional_expression { 766 $$ = build_binary($1, BITXOR, $3, $4); 767 } 768 | conditional_expression T_BITOR sys conditional_expression { 769 $$ = build_binary($1, BITOR, $3, $4); 770 } 771 | conditional_expression T_LOGAND sys conditional_expression { 772 $$ = build_binary($1, LOGAND, $3, $4); 773 } 774 | conditional_expression T_LOGOR sys conditional_expression { 775 $$ = build_binary($1, LOGOR, $3, $4); 776 } 777 | conditional_expression T_QUEST sys 778 expression T_COLON sys conditional_expression { 779 $$ = build_binary($1, QUEST, $3, 780 build_binary($4, COLON, $6, $7)); 781 } 782 ; 783 784 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 785 assignment_expression: 786 conditional_expression 787 | unary_expression T_ASSIGN sys assignment_expression { 788 $$ = build_binary($1, ASSIGN, $3, $4); 789 } 790 | unary_expression T_OPASSIGN sys assignment_expression { 791 $$ = build_binary($1, $2, $3, $4); 792 } 793 ; 794 795 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 796 expression: 797 assignment_expression 798 | expression T_COMMA sys assignment_expression { 799 $$ = build_binary($1, COMMA, $3, $4); 800 } 801 ; 802 803 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 804 constant_expression: 805 conditional_expression 806 ; 807 808 declaration_or_error: 809 declaration 810 | error T_SEMI 811 ; 812 813 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 814 declaration: 815 begin_type_declmods end_type T_SEMI { 816 if (dcs->d_scl == TYPEDEF) 817 /* typedef declares no type name */ 818 warning(72); 819 else 820 /* empty declaration */ 821 warning(2); 822 } 823 | begin_type_declmods end_type notype_init_declarators T_SEMI { 824 if (dcs->d_scl == TYPEDEF) 825 /* syntax error '%s' */ 826 error(249, "missing base type for typedef"); 827 else 828 /* old-style declaration; add 'int' */ 829 error(1); 830 } 831 | begin_type_declaration_specifiers end_type T_SEMI { 832 if (dcs->d_scl == TYPEDEF) 833 /* typedef declares no type name */ 834 warning(72); 835 else if (!dcs->d_nonempty_decl) 836 /* empty declaration */ 837 warning(2); 838 } 839 | begin_type_declaration_specifiers end_type 840 type_init_declarators T_SEMI 841 | static_assert_declaration 842 ; 843 844 begin_type_declaration_specifiers: /* see C99 6.7 */ 845 begin_type_typespec { 846 dcs_add_type($1); 847 } 848 | begin_type_declmods type_specifier { 849 dcs_add_type($2); 850 } 851 | type_attribute begin_type_declaration_specifiers 852 | begin_type_declaration_specifiers declmod 853 | begin_type_declaration_specifiers notype_type_specifier { 854 dcs_add_type($2); 855 } 856 ; 857 858 begin_type_declmods: /* see C99 6.7 */ 859 begin_type type_qualifier { 860 dcs_add_qualifiers($2); 861 } 862 | begin_type T_SCLASS { 863 dcs_add_storage_class($2); 864 } 865 | begin_type T_FUNCTION_SPECIFIER { 866 dcs_add_function_specifier($2); 867 } 868 | begin_type_declmods declmod 869 ; 870 871 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 872 begin_type_specifier_qualifier_list_postfix 873 | type_attribute_list begin_type_specifier_qualifier_list_postfix 874 ; 875 876 begin_type_specifier_qualifier_list_postfix: 877 begin_type_typespec { 878 dcs_add_type($1); 879 } 880 | begin_type_qualifier_list type_specifier { 881 dcs_add_type($2); 882 } 883 | begin_type_specifier_qualifier_list_postfix type_qualifier { 884 dcs_add_qualifiers($2); 885 } 886 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 887 dcs_add_type($2); 888 } 889 | begin_type_specifier_qualifier_list_postfix type_attribute 890 ; 891 892 begin_type_typespec: 893 begin_type notype_type_specifier { 894 $$ = $2; 895 } 896 | begin_type T_TYPENAME { 897 $$ = getsym($2)->s_type; 898 } 899 ; 900 901 begin_type_qualifier_list: 902 begin_type type_qualifier { 903 dcs_add_qualifiers($2); 904 } 905 | begin_type_qualifier_list type_qualifier { 906 dcs_add_qualifiers($2); 907 } 908 ; 909 910 declmod: 911 type_qualifier { 912 dcs_add_qualifiers($1); 913 } 914 | T_SCLASS { 915 dcs_add_storage_class($1); 916 } 917 | T_FUNCTION_SPECIFIER { 918 dcs_add_function_specifier($1); 919 } 920 | type_attribute_list 921 ; 922 923 type_attribute_list_opt: 924 /* empty */ 925 | type_attribute_list 926 ; 927 928 type_attribute_list: 929 type_attribute 930 | type_attribute_list type_attribute 931 ; 932 933 type_attribute_opt: 934 /* empty */ 935 | type_attribute 936 ; 937 938 type_attribute: /* See C11 6.7 declaration-specifiers */ 939 gcc_attribute_specifier 940 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 941 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 942 | T_PACKED { 943 dcs_add_packed(); 944 } 945 ; 946 947 begin_type: 948 /* empty */ { 949 dcs_begin_type(); 950 } 951 ; 952 953 end_type: 954 /* empty */ { 955 dcs_end_type(); 956 } 957 ; 958 959 type_specifier: /* C99 6.7.2 */ 960 notype_type_specifier 961 | T_TYPENAME { 962 $$ = getsym($1)->s_type; 963 } 964 ; 965 966 notype_type_specifier: /* see C99 6.7.2 */ 967 T_TYPE { 968 $$ = gettyp($1); 969 } 970 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 971 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 972 $$->t_typeof = true; 973 } 974 | atomic_type_specifier 975 | struct_or_union_specifier { 976 end_declaration_level(); 977 $$ = $1; 978 } 979 | enum_specifier { 980 end_declaration_level(); 981 $$ = $1; 982 } 983 ; 984 985 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 986 atomic_type_specifier: 987 atomic T_LPAREN type_name T_RPAREN { 988 $$ = $3; 989 } 990 ; 991 992 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 993 struct_or_union_specifier: 994 struct_or_union identifier_sym { 995 /* 996 * STDC requires that "struct a;" always introduces 997 * a new tag if "a" is not declared at current level 998 * 999 * yychar is valid because otherwise the parser would not 1000 * have been able to decide if it must shift or reduce 1001 */ 1002 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1003 } 1004 | struct_or_union identifier_sym { 1005 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1006 } braced_member_declaration_list { 1007 $$ = complete_struct_or_union($4); 1008 } 1009 | struct_or_union { 1010 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1011 } braced_member_declaration_list { 1012 $$ = complete_struct_or_union($3); 1013 } 1014 | struct_or_union error { 1015 set_sym_kind(SK_VCFT); 1016 $$ = gettyp(INT); 1017 } 1018 ; 1019 1020 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1021 struct_or_union: 1022 T_STRUCT_OR_UNION { 1023 set_sym_kind(SK_TAG); 1024 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1025 dcs->d_sou_size_in_bits = 0; 1026 dcs->d_sou_align_in_bits = CHAR_SIZE; 1027 $$ = $1; 1028 } 1029 | struct_or_union type_attribute 1030 ; 1031 1032 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1033 T_LBRACE { 1034 set_sym_kind(SK_VCFT); 1035 } member_declaration_list_with_rbrace { 1036 $$ = $3; 1037 } 1038 ; 1039 1040 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1041 member_declaration_list T_RBRACE 1042 | T_RBRACE { 1043 /* XXX: Allowed since C23. */ 1044 $$ = NULL; 1045 } 1046 ; 1047 1048 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1049 /* Was named struct_declaration_list until C11. */ 1050 member_declaration_list: 1051 member_declaration 1052 | member_declaration_list member_declaration { 1053 $$ = concat_symbols($1, $2); 1054 } 1055 ; 1056 1057 /* Was named struct_declaration until C11. */ 1058 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1059 member_declaration: 1060 begin_type_qualifier_list end_type { 1061 /* ^^ There is no check for the missing type-specifier. */ 1062 /* too late, i know, but getsym() compensates it */ 1063 set_sym_kind(SK_MEMBER); 1064 } notype_member_declarators T_SEMI { 1065 set_sym_kind(SK_VCFT); 1066 $$ = $4; 1067 } 1068 | begin_type_specifier_qualifier_list end_type { 1069 set_sym_kind(SK_MEMBER); 1070 } type_member_declarators T_SEMI { 1071 set_sym_kind(SK_VCFT); 1072 $$ = $4; 1073 } 1074 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1075 /* syntax error '%s' */ 1076 error(249, "member without type"); 1077 $$ = NULL; 1078 } 1079 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1080 T_SEMI { 1081 set_sym_kind(SK_VCFT); 1082 if (!allow_c11 && !allow_gcc) 1083 /* anonymous struct/union members is a C11 feature */ 1084 warning(49); 1085 if (is_struct_or_union(dcs->d_type->t_tspec)) 1086 $$ = declare_unnamed_member(); 1087 else { 1088 /* syntax error '%s' */ 1089 error(249, "unnamed member"); 1090 $$ = NULL; 1091 } 1092 } 1093 | static_assert_declaration { 1094 $$ = NULL; 1095 } 1096 | error T_SEMI { 1097 set_sym_kind(SK_VCFT); 1098 $$ = NULL; 1099 } 1100 ; 1101 1102 /* Was named struct_declarators until C11. */ 1103 notype_member_declarators: 1104 notype_member_declarator { 1105 $$ = declare_member($1); 1106 } 1107 | notype_member_declarators { 1108 set_sym_kind(SK_MEMBER); 1109 } T_COMMA type_member_declarator { 1110 $$ = concat_symbols($1, declare_member($4)); 1111 } 1112 ; 1113 1114 /* Was named struct_declarators until C11. */ 1115 type_member_declarators: 1116 type_member_declarator { 1117 $$ = declare_member($1); 1118 } 1119 | type_member_declarators { 1120 set_sym_kind(SK_MEMBER); 1121 } T_COMMA type_member_declarator { 1122 $$ = concat_symbols($1, declare_member($4)); 1123 } 1124 ; 1125 1126 /* Was named struct_declarator until C11. */ 1127 notype_member_declarator: 1128 notype_declarator 1129 /* C99 6.7.2.1 */ 1130 | notype_declarator T_COLON constant_expression { 1131 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1132 } 1133 /* C99 6.7.2.1 */ 1134 | { 1135 set_sym_kind(SK_VCFT); 1136 } T_COLON constant_expression { 1137 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1138 } 1139 ; 1140 1141 /* Was named struct_declarator until C11. */ 1142 type_member_declarator: 1143 type_declarator 1144 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1145 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1146 } 1147 | { 1148 set_sym_kind(SK_VCFT); 1149 } T_COLON constant_expression type_attribute_list_opt { 1150 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1151 } 1152 ; 1153 1154 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1155 enum_specifier: 1156 enum gcc_attribute_specifier_list_opt identifier_sym { 1157 $$ = make_tag_type($3, ENUM, false, false); 1158 } 1159 | enum gcc_attribute_specifier_list_opt identifier_sym { 1160 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1161 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1162 $$ = complete_enum($5); 1163 } 1164 | enum gcc_attribute_specifier_list_opt { 1165 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1166 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1167 $$ = complete_enum($4); 1168 } 1169 | enum error { 1170 set_sym_kind(SK_VCFT); 1171 $$ = gettyp(INT); 1172 } 1173 ; 1174 1175 enum: /* helper for C99 6.7.2.2 */ 1176 T_ENUM { 1177 set_sym_kind(SK_TAG); 1178 begin_declaration_level(DLK_ENUM); 1179 } 1180 ; 1181 1182 enum_declaration: /* helper for C99 6.7.2.2 */ 1183 T_LBRACE { 1184 set_sym_kind(SK_VCFT); 1185 enumval = 0; 1186 } enums_with_opt_comma T_RBRACE { 1187 $$ = $3; 1188 } 1189 ; 1190 1191 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1192 enumerator_list 1193 | enumerator_list T_COMMA { 1194 if (!allow_c99 && !allow_trad) 1195 /* trailing ',' in enum declaration requires C99 ... */ 1196 error(54); 1197 else 1198 /* trailing ',' in enum declaration requires C99 ... */ 1199 c99ism(54); 1200 $$ = $1; 1201 } 1202 ; 1203 1204 enumerator_list: /* C99 6.7.2.2 */ 1205 enumerator 1206 | enumerator_list T_COMMA enumerator { 1207 $$ = concat_symbols($1, $3); 1208 } 1209 | error { 1210 $$ = NULL; 1211 } 1212 ; 1213 1214 enumerator: /* C99 6.7.2.2 */ 1215 identifier_sym gcc_attribute_specifier_list_opt { 1216 $$ = enumeration_constant($1, enumval, true); 1217 } 1218 | identifier_sym gcc_attribute_specifier_list_opt 1219 T_ASSIGN constant_expression { 1220 $$ = enumeration_constant($1, to_int_constant($4, true), 1221 false); 1222 } 1223 ; 1224 1225 type_qualifier: /* C99 6.7.3 */ 1226 T_QUAL 1227 | atomic { 1228 $$ = (type_qualifiers){ .tq_atomic = true }; 1229 } 1230 ; 1231 1232 atomic: /* helper */ 1233 T_ATOMIC { 1234 /* TODO: First fix c11ism, then use it here. */ 1235 if (!allow_c11) 1236 /* '_Atomic' requires C11 or later */ 1237 error(350); 1238 } 1239 ; 1240 1241 pointer: /* C99 6.7.5 */ 1242 T_ASTERISK type_qualifier_list_opt { 1243 $$ = xcalloc(1, sizeof(*$$)); 1244 add_type_qualifiers(&$$->qualifiers, $2); 1245 } 1246 | T_ASTERISK type_qualifier_list_opt pointer { 1247 $$ = xcalloc(1, sizeof(*$$)); 1248 add_type_qualifiers(&$$->qualifiers, $2); 1249 $$ = append_qualified_pointer($$, $3); 1250 } 1251 ; 1252 1253 type_qualifier_list_opt: /* see C99 6.7.5 */ 1254 /* empty */ { 1255 $$ = (type_qualifiers){ .tq_const = false }; 1256 } 1257 | type_qualifier_list 1258 ; 1259 1260 type_qualifier_list: /* C99 6.7.5 */ 1261 type_qualifier 1262 | type_qualifier_list type_qualifier { 1263 $$ = $1; 1264 add_type_qualifiers(&$$, $2); 1265 } 1266 ; 1267 1268 /* 1269 * For an explanation of 'notype' in the following rules, see 1270 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1271 */ 1272 1273 notype_init_declarators: 1274 notype_init_declarator 1275 | notype_init_declarators T_COMMA type_init_declarator 1276 ; 1277 1278 type_init_declarators: 1279 type_init_declarator 1280 | type_init_declarators T_COMMA type_init_declarator 1281 ; 1282 1283 notype_init_declarator: 1284 notype_declarator asm_or_symbolrename_opt { 1285 cgram_declare($1, false, $2); 1286 check_size($1); 1287 } 1288 | notype_declarator asm_or_symbolrename_opt { 1289 begin_initialization($1); 1290 cgram_declare($1, true, $2); 1291 } T_ASSIGN initializer { 1292 check_size($1); 1293 end_initialization(); 1294 } 1295 ; 1296 1297 type_init_declarator: 1298 type_declarator asm_or_symbolrename_opt { 1299 cgram_declare($1, false, $2); 1300 check_size($1); 1301 } 1302 | type_declarator asm_or_symbolrename_opt { 1303 begin_initialization($1); 1304 cgram_declare($1, true, $2); 1305 } T_ASSIGN initializer { 1306 check_size($1); 1307 end_initialization(); 1308 } 1309 ; 1310 1311 notype_declarator: 1312 notype_direct_declarator 1313 | pointer notype_direct_declarator { 1314 $$ = add_pointer($2, $1); 1315 } 1316 ; 1317 1318 type_declarator: 1319 type_direct_declarator 1320 | pointer type_direct_declarator { 1321 $$ = add_pointer($2, $1); 1322 } 1323 ; 1324 1325 notype_direct_declarator: 1326 type_attribute_list_opt T_NAME { 1327 $$ = declarator_name(getsym($2)); 1328 } 1329 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1330 $$ = $3; 1331 } 1332 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1333 $$ = add_array($1, $3.has_dim, $3.dim); 1334 } 1335 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1336 $$ = add_function(symbolrename($1, $3), $2); 1337 end_declaration_level(); 1338 block_level--; 1339 } 1340 | notype_direct_declarator type_attribute 1341 ; 1342 1343 type_direct_declarator: 1344 type_attribute_list_opt identifier { 1345 $$ = declarator_name(getsym($2)); 1346 } 1347 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1348 $$ = $3; 1349 } 1350 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1351 $$ = add_array($1, $3.has_dim, $3.dim); 1352 } 1353 | type_direct_declarator param_list asm_or_symbolrename_opt { 1354 $$ = add_function(symbolrename($1, $3), $2); 1355 end_declaration_level(); 1356 block_level--; 1357 } 1358 | type_direct_declarator type_attribute 1359 ; 1360 1361 /* 1362 * The two distinct rules type_param_declarator and notype_param_declarator 1363 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1364 * always treated as a typename, not an argument name. For example, after 1365 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1366 * "f(int (double));", not "f(int a);". 1367 */ 1368 type_param_declarator: 1369 direct_param_declarator 1370 | pointer direct_param_declarator { 1371 $$ = add_pointer($2, $1); 1372 } 1373 ; 1374 1375 notype_param_declarator: 1376 direct_notype_param_declarator 1377 | pointer direct_notype_param_declarator { 1378 $$ = add_pointer($2, $1); 1379 } 1380 ; 1381 1382 direct_param_declarator: 1383 identifier type_attribute_list { 1384 $$ = declarator_name(getsym($1)); 1385 } 1386 | identifier { 1387 $$ = declarator_name(getsym($1)); 1388 } 1389 | T_LPAREN notype_param_declarator T_RPAREN { 1390 $$ = $2; 1391 } 1392 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1393 gcc_attribute_specifier_list_opt { 1394 $$ = add_array($1, $3.has_dim, $3.dim); 1395 } 1396 | direct_param_declarator param_list asm_or_symbolrename_opt { 1397 $$ = add_function(symbolrename($1, $3), $2); 1398 end_declaration_level(); 1399 block_level--; 1400 } 1401 ; 1402 1403 direct_notype_param_declarator: 1404 identifier { 1405 $$ = declarator_name(getsym($1)); 1406 } 1407 | T_LPAREN notype_param_declarator T_RPAREN { 1408 $$ = $2; 1409 } 1410 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1411 $$ = add_array($1, $3.has_dim, $3.dim); 1412 } 1413 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1414 $$ = add_function(symbolrename($1, $3), $2); 1415 end_declaration_level(); 1416 block_level--; 1417 } 1418 ; 1419 1420 param_list: 1421 T_LPAREN { 1422 block_level++; 1423 begin_declaration_level(DLK_PROTO_PARAMS); 1424 } identifier_list T_RPAREN { 1425 $$ = (parameter_list){ .first = $3 }; 1426 } 1427 | abstract_decl_param_list 1428 ; 1429 1430 array_size_opt: 1431 /* empty */ { 1432 $$.has_dim = false; 1433 $$.dim = 0; 1434 } 1435 | T_ASTERISK { 1436 /* since C99; variable length array of unspecified size */ 1437 $$.has_dim = false; /* TODO: maybe change to true */ 1438 $$.dim = 0; /* just as a placeholder */ 1439 } 1440 | type_qualifier_list_opt T_SCLASS constant_expression { 1441 /* C11 6.7.6.3p7 */ 1442 if ($2 != STATIC) 1443 yyerror("Bad attribute"); 1444 /* static array size requires C11 or later */ 1445 c11ism(343); 1446 $$.has_dim = true; 1447 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1448 } 1449 | type_qualifier { 1450 /* C11 6.7.6.2 */ 1451 if (!$1.tq_restrict) 1452 yyerror("Bad attribute"); 1453 $$.has_dim = true; 1454 $$.dim = 0; 1455 } 1456 | constant_expression { 1457 $$.has_dim = true; 1458 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1459 } 1460 ; 1461 1462 identifier_list: /* C99 6.7.5 */ 1463 T_NAME { 1464 $$ = old_style_function_parameter_name(getsym($1)); 1465 } 1466 | identifier_list T_COMMA T_NAME { 1467 $$ = concat_symbols($1, 1468 old_style_function_parameter_name(getsym($3))); 1469 } 1470 | identifier_list error 1471 ; 1472 1473 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1474 type_name: /* C99 6.7.6 */ 1475 { 1476 begin_declaration_level(DLK_ABSTRACT); 1477 } abstract_declaration { 1478 end_declaration_level(); 1479 $$ = $2->s_type; 1480 } 1481 ; 1482 1483 abstract_declaration: /* specific to lint */ 1484 begin_type_qualifier_list end_type { 1485 $$ = declare_abstract_type(abstract_name()); 1486 } 1487 | begin_type_specifier_qualifier_list end_type { 1488 $$ = declare_abstract_type(abstract_name()); 1489 } 1490 | begin_type_qualifier_list end_type abstract_declarator { 1491 $$ = declare_abstract_type($3); 1492 } 1493 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1494 $$ = declare_abstract_type($3); 1495 } 1496 ; 1497 1498 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1499 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1500 abstract_declarator: 1501 pointer { 1502 $$ = add_pointer(abstract_name(), $1); 1503 } 1504 | direct_abstract_declarator 1505 | pointer direct_abstract_declarator { 1506 $$ = add_pointer($2, $1); 1507 } 1508 | type_attribute_list direct_abstract_declarator { 1509 $$ = $2; 1510 } 1511 | pointer type_attribute_list direct_abstract_declarator { 1512 $$ = add_pointer($3, $1); 1513 } 1514 ; 1515 1516 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1517 direct_abstract_declarator: 1518 /* TODO: sort rules according to C99 */ 1519 T_LPAREN abstract_declarator T_RPAREN { 1520 $$ = $2; 1521 } 1522 | T_LBRACK array_size_opt T_RBRACK { 1523 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1524 } 1525 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1526 $$ = add_array($1, $3.has_dim, $3.dim); 1527 } 1528 | abstract_decl_param_list asm_or_symbolrename_opt { 1529 sym_t *name = abstract_enclosing_name(); 1530 $$ = add_function(symbolrename(name, $2), $1); 1531 end_declaration_level(); 1532 block_level--; 1533 } 1534 | direct_abstract_declarator abstract_decl_param_list 1535 asm_or_symbolrename_opt { 1536 $$ = add_function(symbolrename($1, $3), $2); 1537 end_declaration_level(); 1538 block_level--; 1539 } 1540 | direct_abstract_declarator type_attribute_list 1541 ; 1542 1543 abstract_decl_param_list: /* specific to lint */ 1544 abstract_decl_lparen T_RPAREN type_attribute_opt { 1545 $$ = (parameter_list){ .first = NULL }; 1546 } 1547 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1548 type_attribute_opt { 1549 $$ = $2; 1550 $$.prototype = true; 1551 } 1552 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1553 $$ = (parameter_list){ .first = NULL }; 1554 } 1555 ; 1556 1557 abstract_decl_lparen: /* specific to lint */ 1558 T_LPAREN { 1559 block_level++; 1560 begin_declaration_level(DLK_PROTO_PARAMS); 1561 } 1562 ; 1563 1564 vararg_parameter_type_list: /* specific to lint */ 1565 parameter_type_list 1566 | parameter_type_list T_COMMA T_ELLIPSIS { 1567 $$ = $1; 1568 $$.vararg = true; 1569 } 1570 | T_ELLIPSIS { 1571 /* TODO: C99 6.7.5 makes this an error as well. */ 1572 if (!allow_trad && !allow_c99) 1573 /* C90 to C17 require formal parameter before '...' */ 1574 error(84); 1575 else if (allow_c90) 1576 /* C90 to C17 require formal parameter before '...' */ 1577 warning(84); 1578 $$ = (parameter_list){ .vararg = true }; 1579 } 1580 ; 1581 1582 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1583 parameter_type_list: 1584 parameter_declaration { 1585 $$ = (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_sym_kind(SK_LABEL); 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_sym_kind(SK_VCFT); 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_sym_kind(SK_LABEL); 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 * On the top level, lint allows several forms of declarations that it doesn't 2049 * allow in functions. For example, a single ';' is an empty declaration and 2050 * is supported by some compilers, but in a function it would be an empty 2051 * statement, not a declaration. This makes a difference in C90 mode, where 2052 * a statement must not be followed by a declaration. 2053 * 2054 * See 'declaration' for all other declarations. 2055 */ 2056 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2057 begin_type end_type notype_init_declarators T_SEMI { 2058 /* TODO: Make this an error in C99 mode as well. */ 2059 if (!allow_trad && !allow_c99) 2060 /* old-style declaration; add 'int' */ 2061 error(1); 2062 else if (allow_c90) 2063 /* old-style declaration; add 'int' */ 2064 warning(1); 2065 } 2066 | declaration 2067 | error T_SEMI { 2068 global_clean_up(); 2069 } 2070 | error T_RBRACE { 2071 global_clean_up(); 2072 } 2073 ; 2074 2075 function_definition: /* C99 6.9.1 */ 2076 func_declarator { 2077 if ($1->s_type->t_tspec != FUNC) { 2078 /* syntax error '%s' */ 2079 error(249, yytext); 2080 YYERROR; 2081 } 2082 if ($1->s_type->t_typedef) { 2083 /* ()-less function definition */ 2084 error(64); 2085 YYERROR; 2086 } 2087 check_extern_declaration($1); 2088 begin_function($1); 2089 block_level++; 2090 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2091 if (lwarn == LWARN_NONE) 2092 $1->s_used = true; 2093 } arg_declaration_list_opt { 2094 end_declaration_level(); 2095 block_level--; 2096 check_func_lint_directives(); 2097 check_func_old_style_parameters(); 2098 begin_control_statement(CS_FUNCTION_BODY); 2099 } compound_statement { 2100 end_function(); 2101 end_control_statement(CS_FUNCTION_BODY); 2102 } 2103 ; 2104 2105 func_declarator: 2106 begin_type end_type notype_declarator { 2107 if (!allow_trad) 2108 /* old-style declaration; add 'int' */ 2109 error(1); 2110 $$ = $3; 2111 } 2112 | begin_type_declmods end_type notype_declarator { 2113 if (!allow_trad) 2114 /* old-style declaration; add 'int' */ 2115 error(1); 2116 $$ = $3; 2117 } 2118 | begin_type_declaration_specifiers end_type type_declarator { 2119 $$ = $3; 2120 } 2121 ; 2122 2123 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2124 /* empty */ 2125 | arg_declaration_list 2126 ; 2127 2128 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2129 arg_declaration 2130 | arg_declaration_list arg_declaration 2131 /* XXX or better "arg_declaration error" ? */ 2132 | error 2133 ; 2134 2135 /* 2136 * "arg_declaration" is separated from "declaration" because it 2137 * needs other error handling. 2138 */ 2139 arg_declaration: 2140 begin_type_declmods end_type T_SEMI { 2141 /* empty declaration */ 2142 warning(2); 2143 } 2144 | begin_type_declmods end_type notype_init_declarators T_SEMI 2145 | begin_type_declaration_specifiers end_type T_SEMI { 2146 if (!dcs->d_nonempty_decl) 2147 /* empty declaration */ 2148 warning(2); 2149 else 2150 /* '%s' declared in parameter declaration list */ 2151 warning(3, type_name(dcs->d_type)); 2152 } 2153 | begin_type_declaration_specifiers end_type 2154 type_init_declarators T_SEMI { 2155 if (dcs->d_nonempty_decl) 2156 /* '%s' declared in parameter declaration list */ 2157 warning(3, type_name(dcs->d_type)); 2158 } 2159 | begin_type_declmods error 2160 | begin_type_declaration_specifiers error 2161 ; 2162 2163 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2164 gcc_attribute_specifier_list_opt: 2165 /* empty */ 2166 | gcc_attribute_specifier_list 2167 ; 2168 2169 gcc_attribute_specifier_list: 2170 gcc_attribute_specifier 2171 | gcc_attribute_specifier_list gcc_attribute_specifier 2172 ; 2173 2174 gcc_attribute_specifier: 2175 T_ATTRIBUTE T_LPAREN T_LPAREN { 2176 in_gcc_attribute = true; 2177 } gcc_attribute_list { 2178 in_gcc_attribute = false; 2179 } T_RPAREN T_RPAREN 2180 ; 2181 2182 gcc_attribute_list: 2183 gcc_attribute 2184 | gcc_attribute_list T_COMMA gcc_attribute 2185 ; 2186 2187 gcc_attribute: 2188 /* empty */ 2189 | T_NAME { 2190 const char *name = $1->sb_name; 2191 if (is_either(name, "packed", "__packed__")) 2192 dcs_add_packed(); 2193 else if (is_either(name, "used", "__used__") || 2194 is_either(name, "unused", "__unused__")) 2195 dcs_set_used(); 2196 else if (is_either(name, "fallthrough", "__fallthrough__")) 2197 suppress_fallthrough = true; 2198 } 2199 | T_NAME T_LPAREN T_RPAREN 2200 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2201 | type_qualifier { 2202 if (!$1.tq_const) 2203 yyerror("Bad attribute"); 2204 } 2205 ; 2206 2207 gcc_attribute_parameters: 2208 constant_expression 2209 | gcc_attribute_parameters T_COMMA constant_expression 2210 ; 2211 2212 sys: 2213 /* empty */ { 2214 $$ = in_system_header; 2215 } 2216 ; 2217 2218 %% 2219 2220 /* ARGSUSED */ 2221 int 2222 yyerror(const char *msg) 2223 { 2224 /* syntax error '%s' */ 2225 error(249, yytext); 2226 if (++sytxerr >= 5) 2227 norecover(); 2228 return 0; 2229 } 2230 2231 #if YYDEBUG && YYBYACC 2232 static const char * 2233 cgram_to_string(int token, YYSTYPE val) 2234 { 2235 2236 switch (token) { 2237 case T_INCDEC: 2238 return val.y_inc ? "++" : "--"; 2239 case T_MULTIPLICATIVE: 2240 case T_ADDITIVE: 2241 case T_SHIFT: 2242 case T_RELATIONAL: 2243 case T_EQUALITY: 2244 case T_OPASSIGN: 2245 return op_name(val.y_op); 2246 case T_SCLASS: 2247 return scl_name(val.y_scl); 2248 case T_TYPE: 2249 case T_STRUCT_OR_UNION: 2250 return tspec_name(val.y_tspec); 2251 case T_QUAL: 2252 return type_qualifiers_string(val.y_type_qualifiers); 2253 case T_FUNCTION_SPECIFIER: 2254 return function_specifier_name(val.y_function_specifier); 2255 case T_NAME: 2256 return val.y_name->sb_name; 2257 default: 2258 return "<none>"; 2259 } 2260 } 2261 #endif 2262 2263 static void 2264 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2265 { 2266 declare(decl, has_initializer, renaming); 2267 if (renaming != NULL) 2268 freeyyv(&renaming, T_NAME); 2269 } 2270 2271 /* 2272 * Discard all input tokens up to and including the next unmatched right 2273 * parenthesis. 2274 */ 2275 static void 2276 read_until_rparen(void) 2277 { 2278 int level; 2279 2280 if (yychar < 0) 2281 yychar = yylex(); 2282 freeyyv(&yylval, yychar); 2283 2284 level = 1; 2285 while (yychar > 0) { 2286 if (yychar == T_LPAREN) 2287 level++; 2288 if (yychar == T_RPAREN && --level == 0) 2289 break; 2290 freeyyv(&yylval, yychar = yylex()); 2291 } 2292 2293 yyclearin; 2294 } 2295 2296 static sym_t * 2297 symbolrename(sym_t *s, sbuf_t *sb) 2298 { 2299 if (sb != NULL) 2300 s->s_rename = sb->sb_name; 2301 return s; 2302 } 2303
Indexes created Thu Oct 02 14:10:14 GMT 2025