cgram.y revision 1.488
1 %{ 2 /* $NetBSD: cgram.y,v 1.488 2024/02/08 19:32:12 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 1.488 2024/02/08 19:32:12 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 struct 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 struct 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 } 442 | translation_unit 443 ; 444 445 identifier_sym: /* helper for struct/union/enum */ 446 identifier { 447 $$ = getsym($1); 448 } 449 ; 450 451 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 452 identifier: 453 T_NAME { 454 debug_step("cgram: name '%s'", $1->sb_name); 455 $$ = $1; 456 } 457 | T_TYPENAME { 458 debug_step("cgram: typename '%s'", $1->sb_name); 459 $$ = $1; 460 } 461 ; 462 463 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 464 string: 465 T_STRING 466 | string T_STRING { 467 if (!allow_c90) { 468 /* concatenated strings are illegal in traditional C */ 469 warning(219); 470 } 471 $$ = cat_strings($1, $2); 472 } 473 ; 474 475 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 476 primary_expression: 477 T_NAME { 478 bool sys_name, sys_next; 479 sys_name = in_system_header; 480 if (yychar < 0) 481 yychar = yylex(); 482 sys_next = in_system_header; 483 in_system_header = sys_name; 484 $$ = build_name(getsym($1), yychar == T_LPAREN); 485 in_system_header = sys_next; 486 } 487 | T_CON { 488 $$ = build_constant(gettyp($1->v_tspec), $1); 489 } 490 | string { 491 $$ = build_string($1); 492 } 493 | T_LPAREN expression T_RPAREN { 494 if ($2 != NULL) 495 $2->tn_parenthesized = true; 496 $$ = $2; 497 } 498 | generic_selection 499 /* GCC primary-expression, see c_parser_postfix_expression */ 500 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 501 set_sym_kind(SK_MEMBER); 502 } member_designator T_RPAREN { 503 $$ = build_offsetof($3, $6); 504 } 505 ; 506 507 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 508 member_designator: 509 identifier { 510 $$ = (designation) { .dn_len = 0 }; 511 designation_push(&$$, DK_MEMBER, getsym($1), 0); 512 } 513 | member_designator T_LBRACK range T_RBRACK { 514 $$ = $1; 515 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 516 } 517 | member_designator T_POINT { 518 set_sym_kind(SK_MEMBER); 519 } identifier { 520 $$ = $1; 521 designation_push(&$$, DK_MEMBER, getsym($4), 0); 522 } 523 ; 524 525 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 526 generic_selection: 527 T_GENERIC T_LPAREN assignment_expression T_COMMA 528 generic_assoc_list T_RPAREN { 529 /* generic selection requires C11 or later */ 530 c11ism(345); 531 $$ = build_generic_selection($3, $5); 532 } 533 ; 534 535 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 536 generic_assoc_list: 537 generic_association 538 | generic_assoc_list T_COMMA generic_association { 539 $3->ga_prev = $1; 540 $$ = $3; 541 } 542 ; 543 544 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 545 generic_association: 546 type_name T_COLON assignment_expression { 547 $$ = block_zero_alloc(sizeof(*$$), "generic"); 548 $$->ga_arg = $1; 549 $$->ga_result = $3; 550 } 551 | T_DEFAULT T_COLON assignment_expression { 552 $$ = block_zero_alloc(sizeof(*$$), "generic"); 553 $$->ga_arg = NULL; 554 $$->ga_result = $3; 555 } 556 ; 557 558 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.2 */ 559 postfix_expression: 560 primary_expression 561 | postfix_expression T_LBRACK sys expression T_RBRACK { 562 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 563 } 564 | postfix_expression T_LPAREN sys T_RPAREN { 565 function_call *call = 566 expr_zero_alloc(sizeof(*call), "function_call"); 567 $$ = build_function_call($1, $3, call); 568 } 569 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 570 $$ = build_function_call($1, $3, $4); 571 } 572 | postfix_expression point_or_arrow sys T_NAME { 573 $$ = build_member_access($1, $2, $3, $4); 574 } 575 | postfix_expression T_INCDEC sys { 576 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 577 } 578 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 579 sym_t *tmp = mktempsym($2); 580 begin_initialization(tmp); 581 cgram_declare(tmp, true, NULL); 582 } braced_initializer { 583 if (!allow_c99) 584 /* compound literals are a C99/GCC extension */ 585 gnuism(319); 586 $$ = build_name(current_initsym(), false); 587 end_initialization(); 588 } 589 | T_LPAREN compound_statement_lbrace { 590 begin_statement_expr(); 591 } gcc_statement_expr_list { 592 do_statement_expr($4); 593 } compound_statement_rbrace T_RPAREN { 594 $$ = end_statement_expr(); 595 } 596 ; 597 598 /* 599 * The inner part of a GCC statement-expression of the form ({ ... }). 600 * 601 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 602 */ 603 gcc_statement_expr_list: 604 gcc_statement_expr_item 605 | gcc_statement_expr_list gcc_statement_expr_item { 606 $$ = $2; 607 } 608 ; 609 610 gcc_statement_expr_item: 611 declaration_or_error { 612 clear_warning_flags(); 613 $$ = NULL; 614 } 615 | non_expr_statement { 616 $$ = expr_alloc_tnode(); 617 $$->tn_type = gettyp(VOID); 618 } 619 | T_SEMI { 620 $$ = expr_alloc_tnode(); 621 $$->tn_type = gettyp(VOID); 622 } 623 | expression T_SEMI { 624 if ($1 == NULL) { /* in case of syntax errors */ 625 $$ = expr_alloc_tnode(); 626 $$->tn_type = gettyp(VOID); 627 } else { 628 /* XXX: do that only on the last name */ 629 if ($1->tn_op == NAME) 630 $1->tn_sym->s_used = true; 631 expr($1, false, false, false, false); 632 suppress_fallthrough = false; 633 $$ = $1; 634 } 635 } 636 ; 637 638 point_or_arrow: /* helper for 'postfix_expression' */ 639 T_POINT { 640 set_sym_kind(SK_MEMBER); 641 $$ = POINT; 642 } 643 | T_ARROW { 644 set_sym_kind(SK_MEMBER); 645 $$ = ARROW; 646 } 647 ; 648 649 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 650 argument_expression_list: 651 assignment_expression { 652 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 653 add_function_argument($$, $1); 654 } 655 | argument_expression_list T_COMMA assignment_expression { 656 add_function_argument($1, $3); 657 } 658 ; 659 660 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 661 unary_expression: 662 postfix_expression 663 | T_INCDEC sys unary_expression { 664 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 665 } 666 | T_AMPER sys cast_expression { 667 $$ = build_unary(ADDR, $2, $3); 668 } 669 | T_ASTERISK sys cast_expression { 670 $$ = build_unary(INDIR, $2, $3); 671 } 672 | T_ADDITIVE sys cast_expression { 673 if (!allow_c90 && $1 == PLUS) { 674 /* unary '+' is illegal in traditional C */ 675 warning(100); 676 } 677 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 678 } 679 | T_COMPLEMENT sys cast_expression { 680 $$ = build_unary(COMPL, $2, $3); 681 } 682 | T_LOGNOT sys cast_expression { 683 $$ = build_unary(NOT, $2, $3); 684 } 685 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 686 $$ = build_unary(REAL, $2, $3); 687 } 688 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 689 $$ = build_unary(IMAG, $2, $3); 690 } 691 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 692 $$ = $2; 693 } 694 | T_SIZEOF unary_expression { 695 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 696 if ($$ != NULL) 697 check_expr_misc($2, 698 false, false, false, false, false, true); 699 } 700 | T_SIZEOF T_LPAREN type_name T_RPAREN { 701 $$ = build_sizeof($3); 702 } 703 | T_ALIGNOF unary_expression { 704 /* non type argument to alignof is a GCC extension */ 705 gnuism(349); 706 lint_assert($2 != NULL); 707 $$ = build_alignof($2->tn_type); 708 } 709 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 710 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 711 /* TODO: c11ism */ 712 $$ = build_alignof($3); 713 } 714 ; 715 716 /* The rule 'unary_operator' is inlined into unary_expression. */ 717 718 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 719 cast_expression: 720 unary_expression 721 | T_LPAREN type_name T_RPAREN sys cast_expression { 722 $$ = cast($5, $4, $2); 723 } 724 ; 725 726 expression_opt: 727 /* empty */ { 728 $$ = NULL; 729 } 730 | expression 731 ; 732 733 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 734 /* 'conditional_expression' also implements 'additive_expression'. */ 735 /* 'conditional_expression' also implements 'shift_expression'. */ 736 /* 'conditional_expression' also implements 'relational_expression'. */ 737 /* 'conditional_expression' also implements 'equality_expression'. */ 738 /* 'conditional_expression' also implements 'AND_expression'. */ 739 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 740 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 741 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 742 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 743 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 744 conditional_expression: 745 cast_expression 746 | conditional_expression T_ASTERISK sys conditional_expression { 747 $$ = build_binary($1, MULT, $3, $4); 748 } 749 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 750 $$ = build_binary($1, $2, $3, $4); 751 } 752 | conditional_expression T_ADDITIVE sys conditional_expression { 753 $$ = build_binary($1, $2, $3, $4); 754 } 755 | conditional_expression T_SHIFT sys conditional_expression { 756 $$ = build_binary($1, $2, $3, $4); 757 } 758 | conditional_expression T_RELATIONAL sys conditional_expression { 759 $$ = build_binary($1, $2, $3, $4); 760 } 761 | conditional_expression T_EQUALITY sys conditional_expression { 762 $$ = build_binary($1, $2, $3, $4); 763 } 764 | conditional_expression T_AMPER sys conditional_expression { 765 $$ = build_binary($1, BITAND, $3, $4); 766 } 767 | conditional_expression T_BITXOR sys conditional_expression { 768 $$ = build_binary($1, BITXOR, $3, $4); 769 } 770 | conditional_expression T_BITOR sys conditional_expression { 771 $$ = build_binary($1, BITOR, $3, $4); 772 } 773 | conditional_expression T_LOGAND sys conditional_expression { 774 $$ = build_binary($1, LOGAND, $3, $4); 775 } 776 | conditional_expression T_LOGOR sys conditional_expression { 777 $$ = build_binary($1, LOGOR, $3, $4); 778 } 779 | conditional_expression T_QUEST sys 780 expression T_COLON sys conditional_expression { 781 $$ = build_binary($1, QUEST, $3, 782 build_binary($4, COLON, $6, $7)); 783 } 784 ; 785 786 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 787 assignment_expression: 788 conditional_expression 789 | unary_expression T_ASSIGN sys assignment_expression { 790 $$ = build_binary($1, ASSIGN, $3, $4); 791 } 792 | unary_expression T_OPASSIGN sys assignment_expression { 793 $$ = build_binary($1, $2, $3, $4); 794 } 795 ; 796 797 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 798 expression: 799 assignment_expression 800 | expression T_COMMA sys assignment_expression { 801 $$ = build_binary($1, COMMA, $3, $4); 802 } 803 ; 804 805 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 806 constant_expression: 807 conditional_expression 808 ; 809 810 declaration_or_error: 811 declaration 812 | error T_SEMI 813 ; 814 815 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7 */ 816 declaration: 817 begin_type_declmods end_type T_SEMI { 818 if (dcs->d_scl == TYPEDEF) { 819 /* typedef declares no type name */ 820 warning(72); 821 } else { 822 /* empty declaration */ 823 warning(2); 824 } 825 } 826 | begin_type_declmods end_type notype_init_declarators T_SEMI { 827 if (dcs->d_scl == TYPEDEF) { 828 /* syntax error '%s' */ 829 error(249, "missing base type for typedef"); 830 } else { 831 /* old-style declaration; add 'int' */ 832 error(1); 833 } 834 } 835 | begin_type_declaration_specifiers end_type T_SEMI { 836 if (dcs->d_scl == TYPEDEF) { 837 /* typedef declares no type name */ 838 warning(72); 839 } else if (!dcs->d_nonempty_decl) { 840 /* empty declaration */ 841 warning(2); 842 } 843 } 844 | begin_type_declaration_specifiers end_type 845 type_init_declarators T_SEMI 846 | static_assert_declaration 847 ; 848 849 begin_type_declaration_specifiers: /* see C99 6.7 */ 850 begin_type_typespec { 851 dcs_add_type($1); 852 } 853 | begin_type_declmods type_specifier { 854 dcs_add_type($2); 855 } 856 | type_attribute begin_type_declaration_specifiers 857 | begin_type_declaration_specifiers declmod 858 | begin_type_declaration_specifiers notype_type_specifier { 859 dcs_add_type($2); 860 } 861 ; 862 863 begin_type_declmods: /* see C99 6.7 */ 864 begin_type type_qualifier { 865 dcs_add_qualifiers($2); 866 } 867 | begin_type T_SCLASS { 868 dcs_add_storage_class($2); 869 } 870 | begin_type T_FUNCTION_SPECIFIER { 871 dcs_add_function_specifier($2); 872 } 873 | begin_type_declmods declmod 874 ; 875 876 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 877 begin_type_specifier_qualifier_list_postfix 878 | type_attribute_list begin_type_specifier_qualifier_list_postfix 879 ; 880 881 begin_type_specifier_qualifier_list_postfix: 882 begin_type_typespec { 883 dcs_add_type($1); 884 } 885 | begin_type_qualifier_list type_specifier { 886 dcs_add_type($2); 887 } 888 | begin_type_specifier_qualifier_list_postfix type_qualifier { 889 dcs_add_qualifiers($2); 890 } 891 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 892 dcs_add_type($2); 893 } 894 | begin_type_specifier_qualifier_list_postfix type_attribute 895 ; 896 897 begin_type_typespec: 898 begin_type notype_type_specifier { 899 $$ = $2; 900 } 901 | begin_type T_TYPENAME { 902 $$ = getsym($2)->s_type; 903 } 904 ; 905 906 begin_type_qualifier_list: 907 begin_type type_qualifier { 908 dcs_add_qualifiers($2); 909 } 910 | begin_type_qualifier_list type_qualifier { 911 dcs_add_qualifiers($2); 912 } 913 ; 914 915 declmod: 916 type_qualifier { 917 dcs_add_qualifiers($1); 918 } 919 | T_SCLASS { 920 dcs_add_storage_class($1); 921 } 922 | T_FUNCTION_SPECIFIER { 923 dcs_add_function_specifier($1); 924 } 925 | type_attribute_list 926 ; 927 928 type_attribute_list_opt: 929 /* empty */ 930 | type_attribute_list 931 ; 932 933 type_attribute_list: 934 type_attribute 935 | type_attribute_list type_attribute 936 ; 937 938 type_attribute_opt: 939 /* empty */ 940 | type_attribute 941 ; 942 943 type_attribute: /* See C11 6.7 declaration-specifiers */ 944 gcc_attribute_specifier 945 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 946 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN /* C11 6.7.5 */ 947 | T_PACKED { 948 dcs_add_packed(); 949 } 950 ; 951 952 begin_type: 953 /* empty */ { 954 dcs_begin_type(); 955 } 956 ; 957 958 end_type: 959 /* empty */ { 960 dcs_end_type(); 961 } 962 ; 963 964 type_specifier: /* C99 6.7.2 */ 965 notype_type_specifier 966 | T_TYPENAME { 967 $$ = getsym($1)->s_type; 968 } 969 ; 970 971 notype_type_specifier: /* see C99 6.7.2 */ 972 T_TYPE { 973 $$ = gettyp($1); 974 } 975 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 976 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 977 $$->t_typeof = true; 978 } 979 | atomic_type_specifier 980 | struct_or_union_specifier { 981 end_declaration_level(); 982 $$ = $1; 983 } 984 | enum_specifier { 985 end_declaration_level(); 986 $$ = $1; 987 } 988 ; 989 990 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4 */ 991 atomic_type_specifier: 992 atomic T_LPAREN type_name T_RPAREN { 993 $$ = $3; 994 } 995 ; 996 997 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 998 struct_or_union_specifier: 999 struct_or_union identifier_sym { 1000 /* 1001 * STDC requires that "struct a;" always introduces 1002 * a new tag if "a" is not declared at current level 1003 * 1004 * yychar is valid because otherwise the parser would not 1005 * have been able to decide if it must shift or reduce 1006 */ 1007 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1008 } 1009 | struct_or_union identifier_sym { 1010 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1011 } braced_member_declaration_list { 1012 $$ = complete_struct_or_union($4); 1013 } 1014 | struct_or_union { 1015 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1016 } braced_member_declaration_list { 1017 $$ = complete_struct_or_union($3); 1018 } 1019 | struct_or_union error { 1020 set_sym_kind(SK_VCFT); 1021 $$ = gettyp(INT); 1022 } 1023 ; 1024 1025 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.2.1 */ 1026 struct_or_union: 1027 T_STRUCT_OR_UNION { 1028 set_sym_kind(SK_TAG); 1029 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1030 dcs->d_sou_size_in_bits = 0; 1031 dcs->d_sou_align_in_bits = CHAR_SIZE; 1032 $$ = $1; 1033 } 1034 | struct_or_union type_attribute 1035 ; 1036 1037 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1038 T_LBRACE { 1039 set_sym_kind(SK_VCFT); 1040 } member_declaration_list_with_rbrace { 1041 $$ = $3; 1042 } 1043 ; 1044 1045 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1046 member_declaration_list T_RBRACE 1047 | T_RBRACE { 1048 /* XXX: Allowed since C23. */ 1049 $$ = NULL; 1050 } 1051 ; 1052 1053 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1054 /* Was named struct_declaration_list until C11. */ 1055 member_declaration_list: 1056 member_declaration 1057 | member_declaration_list member_declaration { 1058 $$ = concat_symbols($1, $2); 1059 } 1060 ; 1061 1062 /* Was named struct_declaration until C11. */ 1063 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.2.1 */ 1064 member_declaration: 1065 begin_type_qualifier_list end_type { 1066 /* ^^ There is no check for the missing type-specifier. */ 1067 /* too late, i know, but getsym() compensates it */ 1068 set_sym_kind(SK_MEMBER); 1069 } notype_member_declarators T_SEMI { 1070 set_sym_kind(SK_VCFT); 1071 $$ = $4; 1072 } 1073 | begin_type_specifier_qualifier_list end_type { 1074 set_sym_kind(SK_MEMBER); 1075 } type_member_declarators T_SEMI { 1076 set_sym_kind(SK_VCFT); 1077 $$ = $4; 1078 } 1079 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1080 /* syntax error '%s' */ 1081 error(249, "member without type"); 1082 $$ = NULL; 1083 } 1084 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1085 T_SEMI { 1086 set_sym_kind(SK_VCFT); 1087 if (!allow_c11 && !allow_gcc) 1088 /* anonymous struct/union members is a C11 feature */ 1089 warning(49); 1090 if (is_struct_or_union(dcs->d_type->t_tspec)) 1091 $$ = declare_unnamed_member(); 1092 else { 1093 /* syntax error '%s' */ 1094 error(249, "unnamed member"); 1095 $$ = NULL; 1096 } 1097 } 1098 | static_assert_declaration { 1099 $$ = NULL; 1100 } 1101 | error T_SEMI { 1102 set_sym_kind(SK_VCFT); 1103 $$ = NULL; 1104 } 1105 ; 1106 1107 /* Was named struct_declarators until C11. */ 1108 notype_member_declarators: 1109 notype_member_declarator { 1110 $$ = declare_member($1); 1111 } 1112 | notype_member_declarators { 1113 set_sym_kind(SK_MEMBER); 1114 } T_COMMA type_member_declarator { 1115 $$ = concat_symbols($1, declare_member($4)); 1116 } 1117 ; 1118 1119 /* Was named struct_declarators until C11. */ 1120 type_member_declarators: 1121 type_member_declarator { 1122 $$ = declare_member($1); 1123 } 1124 | type_member_declarators { 1125 set_sym_kind(SK_MEMBER); 1126 } T_COMMA type_member_declarator { 1127 $$ = concat_symbols($1, declare_member($4)); 1128 } 1129 ; 1130 1131 /* Was named struct_declarator until C11. */ 1132 notype_member_declarator: 1133 notype_declarator 1134 /* C99 6.7.2.1 */ 1135 | notype_declarator T_COLON constant_expression { 1136 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1137 } 1138 /* C99 6.7.2.1 */ 1139 | { 1140 set_sym_kind(SK_VCFT); 1141 } T_COLON constant_expression { 1142 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1143 } 1144 ; 1145 1146 /* Was named struct_declarator until C11. */ 1147 type_member_declarator: 1148 type_declarator 1149 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1150 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1151 } 1152 | { 1153 set_sym_kind(SK_VCFT); 1154 } T_COLON constant_expression type_attribute_list_opt { 1155 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1156 } 1157 ; 1158 1159 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1160 enum_specifier: 1161 enum gcc_attribute_specifier_list_opt identifier_sym { 1162 $$ = make_tag_type($3, ENUM, false, false); 1163 } 1164 | enum gcc_attribute_specifier_list_opt identifier_sym { 1165 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1166 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1167 $$ = complete_enum($5); 1168 } 1169 | enum gcc_attribute_specifier_list_opt { 1170 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1171 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1172 $$ = complete_enum($4); 1173 } 1174 | enum error { 1175 set_sym_kind(SK_VCFT); 1176 $$ = gettyp(INT); 1177 } 1178 ; 1179 1180 enum: /* helper for C99 6.7.2.2 */ 1181 T_ENUM { 1182 set_sym_kind(SK_TAG); 1183 begin_declaration_level(DLK_ENUM); 1184 } 1185 ; 1186 1187 enum_declaration: /* helper for C99 6.7.2.2 */ 1188 T_LBRACE { 1189 set_sym_kind(SK_VCFT); 1190 enumval = 0; 1191 } enums_with_opt_comma T_RBRACE { 1192 $$ = $3; 1193 } 1194 ; 1195 1196 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1197 enumerator_list 1198 | enumerator_list T_COMMA { 1199 if (!allow_c99 && !allow_trad) { 1200 /* trailing ',' in enum declaration requires C99 ... */ 1201 error(54); 1202 } else { 1203 /* trailing ',' in enum declaration requires C99 ... */ 1204 c99ism(54); 1205 } 1206 $$ = $1; 1207 } 1208 ; 1209 1210 enumerator_list: /* C99 6.7.2.2 */ 1211 enumerator 1212 | enumerator_list T_COMMA enumerator { 1213 $$ = concat_symbols($1, $3); 1214 } 1215 | error { 1216 $$ = NULL; 1217 } 1218 ; 1219 1220 enumerator: /* C99 6.7.2.2 */ 1221 identifier_sym gcc_attribute_specifier_list_opt { 1222 $$ = enumeration_constant($1, enumval, true); 1223 } 1224 | identifier_sym gcc_attribute_specifier_list_opt 1225 T_ASSIGN constant_expression { 1226 $$ = enumeration_constant($1, to_int_constant($4, true), 1227 false); 1228 } 1229 ; 1230 1231 type_qualifier: /* C99 6.7.3 */ 1232 T_QUAL 1233 | atomic { 1234 $$ = (type_qualifiers){ .tq_atomic = true }; 1235 } 1236 ; 1237 1238 atomic: /* helper */ 1239 T_ATOMIC { 1240 /* TODO: First fix c11ism, then use it here. */ 1241 if (!allow_c11) 1242 /* '_Atomic' requires C11 or later */ 1243 error(350); 1244 } 1245 ; 1246 1247 pointer: /* C99 6.7.5 */ 1248 T_ASTERISK type_qualifier_list_opt { 1249 $$ = xcalloc(1, sizeof(*$$)); 1250 add_type_qualifiers(&$$->qualifiers, $2); 1251 } 1252 | T_ASTERISK type_qualifier_list_opt pointer { 1253 $$ = xcalloc(1, sizeof(*$$)); 1254 add_type_qualifiers(&$$->qualifiers, $2); 1255 $$ = append_qualified_pointer($$, $3); 1256 } 1257 ; 1258 1259 type_qualifier_list_opt: /* see C99 6.7.5 */ 1260 /* empty */ { 1261 $$ = (type_qualifiers){ .tq_const = false }; 1262 } 1263 | type_qualifier_list 1264 ; 1265 1266 type_qualifier_list: /* C99 6.7.5 */ 1267 type_qualifier 1268 | type_qualifier_list type_qualifier { 1269 $$ = $1; 1270 add_type_qualifiers(&$$, $2); 1271 } 1272 ; 1273 1274 /* 1275 * For an explanation of 'notype' in the following rules, see 1276 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1277 */ 1278 1279 notype_init_declarators: 1280 notype_init_declarator 1281 | notype_init_declarators T_COMMA type_init_declarator 1282 ; 1283 1284 type_init_declarators: 1285 type_init_declarator 1286 | type_init_declarators T_COMMA type_init_declarator 1287 ; 1288 1289 notype_init_declarator: 1290 notype_declarator asm_or_symbolrename_opt { 1291 cgram_declare($1, false, $2); 1292 check_size($1); 1293 } 1294 | notype_declarator asm_or_symbolrename_opt { 1295 begin_initialization($1); 1296 cgram_declare($1, true, $2); 1297 } T_ASSIGN initializer { 1298 check_size($1); 1299 end_initialization(); 1300 } 1301 ; 1302 1303 type_init_declarator: 1304 type_declarator asm_or_symbolrename_opt { 1305 cgram_declare($1, false, $2); 1306 check_size($1); 1307 } 1308 | type_declarator asm_or_symbolrename_opt { 1309 begin_initialization($1); 1310 cgram_declare($1, true, $2); 1311 } T_ASSIGN initializer { 1312 check_size($1); 1313 end_initialization(); 1314 } 1315 ; 1316 1317 notype_declarator: 1318 notype_direct_declarator 1319 | pointer notype_direct_declarator { 1320 $$ = add_pointer($2, $1); 1321 } 1322 ; 1323 1324 type_declarator: 1325 type_direct_declarator 1326 | pointer type_direct_declarator { 1327 $$ = add_pointer($2, $1); 1328 } 1329 ; 1330 1331 notype_direct_declarator: 1332 type_attribute_list_opt T_NAME { 1333 $$ = declarator_name(getsym($2)); 1334 } 1335 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1336 $$ = $3; 1337 } 1338 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1339 $$ = add_array($1, $3.has_dim, $3.dim); 1340 } 1341 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1342 $$ = add_function(symbolrename($1, $3), $2); 1343 end_declaration_level(); 1344 block_level--; 1345 } 1346 | notype_direct_declarator type_attribute 1347 ; 1348 1349 type_direct_declarator: 1350 type_attribute_list_opt identifier { 1351 $$ = declarator_name(getsym($2)); 1352 } 1353 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1354 $$ = $3; 1355 } 1356 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1357 $$ = add_array($1, $3.has_dim, $3.dim); 1358 } 1359 | type_direct_declarator param_list asm_or_symbolrename_opt { 1360 $$ = add_function(symbolrename($1, $3), $2); 1361 end_declaration_level(); 1362 block_level--; 1363 } 1364 | type_direct_declarator type_attribute 1365 ; 1366 1367 /* 1368 * The two distinct rules type_param_declarator and notype_param_declarator 1369 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1370 * always treated as a typename, not an argument name. For example, after 1371 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1372 * "f(int (double));", not "f(int a);". 1373 */ 1374 type_param_declarator: 1375 direct_param_declarator 1376 | pointer direct_param_declarator { 1377 $$ = add_pointer($2, $1); 1378 } 1379 ; 1380 1381 notype_param_declarator: 1382 direct_notype_param_declarator 1383 | pointer direct_notype_param_declarator { 1384 $$ = add_pointer($2, $1); 1385 } 1386 ; 1387 1388 direct_param_declarator: 1389 identifier type_attribute_list { 1390 $$ = declarator_name(getsym($1)); 1391 } 1392 | identifier { 1393 $$ = declarator_name(getsym($1)); 1394 } 1395 | T_LPAREN notype_param_declarator T_RPAREN { 1396 $$ = $2; 1397 } 1398 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1399 gcc_attribute_specifier_list_opt { 1400 $$ = add_array($1, $3.has_dim, $3.dim); 1401 } 1402 | direct_param_declarator param_list asm_or_symbolrename_opt { 1403 $$ = add_function(symbolrename($1, $3), $2); 1404 end_declaration_level(); 1405 block_level--; 1406 } 1407 ; 1408 1409 direct_notype_param_declarator: 1410 identifier { 1411 $$ = declarator_name(getsym($1)); 1412 } 1413 | T_LPAREN notype_param_declarator T_RPAREN { 1414 $$ = $2; 1415 } 1416 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1417 $$ = add_array($1, $3.has_dim, $3.dim); 1418 } 1419 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1420 $$ = add_function(symbolrename($1, $3), $2); 1421 end_declaration_level(); 1422 block_level--; 1423 } 1424 ; 1425 1426 param_list: 1427 T_LPAREN { 1428 block_level++; 1429 begin_declaration_level(DLK_PROTO_PARAMS); 1430 } identifier_list T_RPAREN { 1431 $$ = (struct parameter_list){ .first = $3 }; 1432 } 1433 | abstract_decl_param_list 1434 ; 1435 1436 array_size_opt: 1437 /* empty */ { 1438 $$.has_dim = false; 1439 $$.dim = 0; 1440 } 1441 | T_ASTERISK { 1442 /* since C99; variable length array of unspecified size */ 1443 $$.has_dim = false; /* TODO: maybe change to true */ 1444 $$.dim = 0; /* just as a placeholder */ 1445 } 1446 | type_qualifier_list_opt T_SCLASS constant_expression { 1447 /* C11 6.7.6.3p7 */ 1448 if ($2 != STATIC) 1449 yyerror("Bad attribute"); 1450 /* static array size requires C11 or later */ 1451 c11ism(343); 1452 $$.has_dim = true; 1453 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1454 } 1455 | type_qualifier { 1456 /* C11 6.7.6.2 */ 1457 if (!$1.tq_restrict) 1458 yyerror("Bad attribute"); 1459 $$.has_dim = true; 1460 $$.dim = 0; 1461 } 1462 | constant_expression { 1463 $$.has_dim = true; 1464 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1465 } 1466 ; 1467 1468 identifier_list: /* C99 6.7.5 */ 1469 T_NAME { 1470 $$ = old_style_function_parameter_name(getsym($1)); 1471 } 1472 | identifier_list T_COMMA T_NAME { 1473 $$ = concat_symbols($1, 1474 old_style_function_parameter_name(getsym($3))); 1475 } 1476 | identifier_list error 1477 ; 1478 1479 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1480 type_name: /* C99 6.7.6 */ 1481 { 1482 begin_declaration_level(DLK_ABSTRACT); 1483 } abstract_declaration { 1484 end_declaration_level(); 1485 $$ = $2->s_type; 1486 } 1487 ; 1488 1489 abstract_declaration: /* specific to lint */ 1490 begin_type_qualifier_list end_type { 1491 $$ = declare_abstract_type(abstract_name()); 1492 } 1493 | begin_type_specifier_qualifier_list end_type { 1494 $$ = declare_abstract_type(abstract_name()); 1495 } 1496 | begin_type_qualifier_list end_type abstract_declarator { 1497 $$ = declare_abstract_type($3); 1498 } 1499 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1500 $$ = declare_abstract_type($3); 1501 } 1502 ; 1503 1504 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1505 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1506 abstract_declarator: 1507 pointer { 1508 $$ = add_pointer(abstract_name(), $1); 1509 } 1510 | direct_abstract_declarator 1511 | pointer direct_abstract_declarator { 1512 $$ = add_pointer($2, $1); 1513 } 1514 | type_attribute_list direct_abstract_declarator { 1515 $$ = $2; 1516 } 1517 | pointer type_attribute_list direct_abstract_declarator { 1518 $$ = add_pointer($3, $1); 1519 } 1520 ; 1521 1522 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1523 direct_abstract_declarator: 1524 /* TODO: sort rules according to C99 */ 1525 T_LPAREN abstract_declarator T_RPAREN { 1526 $$ = $2; 1527 } 1528 | T_LBRACK array_size_opt T_RBRACK { 1529 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1530 } 1531 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1532 $$ = add_array($1, $3.has_dim, $3.dim); 1533 } 1534 | abstract_decl_param_list asm_or_symbolrename_opt { 1535 sym_t *name = abstract_enclosing_name(); 1536 $$ = add_function(symbolrename(name, $2), $1); 1537 end_declaration_level(); 1538 block_level--; 1539 } 1540 | direct_abstract_declarator abstract_decl_param_list 1541 asm_or_symbolrename_opt { 1542 $$ = add_function(symbolrename($1, $3), $2); 1543 end_declaration_level(); 1544 block_level--; 1545 } 1546 | direct_abstract_declarator type_attribute_list 1547 ; 1548 1549 abstract_decl_param_list: /* specific to lint */ 1550 abstract_decl_lparen T_RPAREN type_attribute_opt { 1551 $$ = (struct parameter_list){ .first = NULL }; 1552 } 1553 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1554 type_attribute_opt { 1555 $$ = $2; 1556 $$.prototype = true; 1557 } 1558 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1559 $$ = (struct parameter_list){ .first = NULL }; 1560 } 1561 ; 1562 1563 abstract_decl_lparen: /* specific to lint */ 1564 T_LPAREN { 1565 block_level++; 1566 begin_declaration_level(DLK_PROTO_PARAMS); 1567 } 1568 ; 1569 1570 vararg_parameter_type_list: /* specific to lint */ 1571 parameter_type_list 1572 | parameter_type_list T_COMMA T_ELLIPSIS { 1573 $$ = $1; 1574 $$.vararg = true; 1575 } 1576 | T_ELLIPSIS { 1577 /* TODO: C99 6.7.5 makes this an error as well. */ 1578 if (!allow_trad && !allow_c99) { 1579 /* C90 to C17 require formal parameter before '...' */ 1580 error(84); 1581 } else if (allow_c90) { 1582 /* C90 to C17 require formal parameter before '...' */ 1583 warning(84); 1584 } 1585 $$ = (struct parameter_list){ .vararg = true }; 1586 } 1587 ; 1588 1589 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1590 parameter_type_list: 1591 parameter_declaration { 1592 $$ = (struct parameter_list){ .first = $1 }; 1593 } 1594 | parameter_type_list T_COMMA parameter_declaration { 1595 $$ = $1; 1596 $$.first = concat_symbols($1.first, $3); 1597 } 1598 ; 1599 1600 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1601 parameter_declaration: 1602 begin_type_declmods end_type { 1603 /* ^^ There is no check for the missing type-specifier. */ 1604 $$ = declare_parameter(abstract_name(), false); 1605 } 1606 | begin_type_declaration_specifiers end_type { 1607 $$ = declare_parameter(abstract_name(), false); 1608 } 1609 | begin_type_declmods end_type notype_param_declarator { 1610 /* ^^ There is no check for the missing type-specifier. */ 1611 $$ = declare_parameter($3, false); 1612 } 1613 /* 1614 * type_param_declarator is needed because of following conflict: 1615 * "typedef int a; f(int (a));" could be parsed as 1616 * "function with argument a of type int", or 1617 * "function with an unnamed (abstract) argument of type function". 1618 * This grammar realizes the second case. 1619 */ 1620 | begin_type_declaration_specifiers end_type type_param_declarator { 1621 $$ = declare_parameter($3, false); 1622 } 1623 | begin_type_declmods end_type abstract_declarator { 1624 /* ^^ There is no check for the missing type-specifier. */ 1625 $$ = declare_parameter($3, false); 1626 } 1627 | begin_type_declaration_specifiers end_type abstract_declarator { 1628 $$ = declare_parameter($3, false); 1629 } 1630 ; 1631 1632 braced_initializer: 1633 /* K&R ---, C90 ---, C99 ---, C11 ---, C23 6.7.10 */ 1634 init_lbrace init_rbrace { 1635 /* empty initializer braces require C23 or later */ 1636 c23ism(353); 1637 } 1638 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1639 | init_lbrace initializer_list init_rbrace 1640 | init_lbrace initializer_list T_COMMA init_rbrace 1641 ; 1642 1643 initializer: /* C99 6.7.8 "Initialization" */ 1644 assignment_expression { 1645 init_expr($1); 1646 } 1647 | init_lbrace init_rbrace { 1648 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1649 } 1650 | init_lbrace initializer_list init_rbrace 1651 | init_lbrace initializer_list T_COMMA init_rbrace 1652 /* XXX: What is this error handling for? */ 1653 | error 1654 ; 1655 1656 initializer_list: /* C99 6.7.8 "Initialization" */ 1657 initializer 1658 | designation initializer 1659 | initializer_list T_COMMA initializer 1660 | initializer_list T_COMMA designation initializer 1661 ; 1662 1663 designation: /* C99 6.7.8 "Initialization" */ 1664 { 1665 begin_designation(); 1666 } designator_list T_ASSIGN 1667 | identifier T_COLON { 1668 /* GCC style struct or union member name in initializer */ 1669 gnuism(315); 1670 begin_designation(); 1671 add_designator_member($1); 1672 } 1673 ; 1674 1675 designator_list: /* C99 6.7.8 "Initialization" */ 1676 designator 1677 | designator_list designator 1678 ; 1679 1680 designator: /* C99 6.7.8 "Initialization" */ 1681 T_LBRACK range T_RBRACK { 1682 if (!allow_c99) 1683 /* array initializer with designators is a C99 ... */ 1684 warning(321); 1685 add_designator_subscript($2); 1686 } 1687 | T_POINT identifier { 1688 if (!allow_c99) 1689 /* struct or union member name in initializer is ... */ 1690 warning(313); 1691 add_designator_member($2); 1692 } 1693 ; 1694 1695 static_assert_declaration: 1696 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1697 T_RPAREN T_SEMI { 1698 /* '_Static_assert' requires C11 or later */ 1699 c11ism(354); 1700 } 1701 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1702 /* '_Static_assert' without message requires C23 or later */ 1703 c23ism(355); 1704 } 1705 ; 1706 1707 range: 1708 constant_expression { 1709 $$.lo = to_int_constant($1, true); 1710 $$.hi = $$.lo; 1711 } 1712 | constant_expression T_ELLIPSIS constant_expression { 1713 $$.lo = to_int_constant($1, true); 1714 $$.hi = to_int_constant($3, true); 1715 /* initialization with '[a...b]' is a GCC extension */ 1716 gnuism(340); 1717 } 1718 ; 1719 1720 init_lbrace: /* helper */ 1721 T_LBRACE { 1722 init_lbrace(); 1723 } 1724 ; 1725 1726 init_rbrace: /* helper */ 1727 T_RBRACE { 1728 init_rbrace(); 1729 } 1730 ; 1731 1732 asm_or_symbolrename_opt: /* GCC extensions */ 1733 /* empty */ { 1734 $$ = NULL; 1735 } 1736 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1737 freeyyv(&$3, T_STRING); 1738 $$ = NULL; 1739 } 1740 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1741 gcc_attribute_specifier_list_opt { 1742 $$ = $3; 1743 } 1744 ; 1745 1746 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8 */ 1747 statement: 1748 expression_statement 1749 | non_expr_statement 1750 ; 1751 1752 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1753 no_attr_statement: 1754 expression_statement 1755 | no_attr_non_expr_statement 1756 ; 1757 1758 non_expr_statement: /* helper for C99 6.8 */ 1759 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1760 | no_attr_non_expr_statement 1761 ; 1762 1763 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1764 no_attr_non_expr_statement: 1765 labeled_statement 1766 | compound_statement 1767 | selection_statement 1768 | iteration_statement 1769 | jump_statement { 1770 suppress_fallthrough = false; 1771 } 1772 | asm_statement 1773 ; 1774 1775 labeled_statement: /* C99 6.8.1 */ 1776 label gcc_attribute_specifier_list_opt no_attr_statement 1777 ; 1778 1779 label: 1780 T_NAME T_COLON { 1781 set_sym_kind(SK_LABEL); 1782 named_label(getsym($1)); 1783 } 1784 | T_CASE constant_expression T_COLON { 1785 case_label($2); 1786 suppress_fallthrough = true; 1787 } 1788 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 1789 /* XXX: We don't fill all cases */ 1790 case_label($2); 1791 suppress_fallthrough = true; 1792 } 1793 | T_DEFAULT T_COLON { 1794 default_label(); 1795 suppress_fallthrough = true; 1796 } 1797 ; 1798 1799 compound_statement: /* C99 6.8.2 */ 1800 compound_statement_lbrace compound_statement_rbrace 1801 | compound_statement_lbrace block_item_list compound_statement_rbrace 1802 ; 1803 1804 compound_statement_lbrace: 1805 T_LBRACE { 1806 block_level++; 1807 mem_block_level++; 1808 debug_step("%s: mem_block_level = %zu", 1809 "compound_statement_lbrace", mem_block_level); 1810 begin_declaration_level(DLK_AUTO); 1811 } 1812 ; 1813 1814 compound_statement_rbrace: 1815 T_RBRACE { 1816 end_declaration_level(); 1817 if (!in_statement_expr()) 1818 level_free_all(mem_block_level); /* leak */ 1819 mem_block_level--; 1820 debug_step("%s: mem_block_level = %zu", 1821 "compound_statement_rbrace", mem_block_level); 1822 block_level--; 1823 suppress_fallthrough = false; 1824 } 1825 ; 1826 1827 block_item_list: /* C99 6.8.2 */ 1828 block_item 1829 | block_item_list block_item { 1830 if ($1 && !$2) 1831 /* declarations after statements is a C99 feature */ 1832 c99ism(327); 1833 $$ = $1 || $2; 1834 } 1835 ; 1836 1837 block_item: /* C99 6.8.2 */ 1838 declaration_or_error { 1839 $$ = false; 1840 restore_warning_flags(); 1841 } 1842 | statement { 1843 $$ = true; 1844 restore_warning_flags(); 1845 } 1846 ; 1847 1848 expression_statement: /* C99 6.8.3 */ 1849 expression T_SEMI { 1850 expr($1, false, false, false, false); 1851 suppress_fallthrough = false; 1852 } 1853 | T_SEMI { 1854 check_statement_reachable(); 1855 suppress_fallthrough = false; 1856 } 1857 ; 1858 1859 selection_statement: /* C99 6.8.4 */ 1860 if_without_else %prec T_THEN { 1861 save_warning_flags(); 1862 stmt_if_then_stmt(); 1863 stmt_if_else_stmt(false); 1864 } 1865 | if_without_else T_ELSE { 1866 save_warning_flags(); 1867 stmt_if_then_stmt(); 1868 } statement { 1869 clear_warning_flags(); 1870 stmt_if_else_stmt(true); 1871 } 1872 | if_without_else T_ELSE error { 1873 clear_warning_flags(); 1874 stmt_if_else_stmt(false); 1875 } 1876 | switch_expr statement { 1877 clear_warning_flags(); 1878 stmt_switch_expr_stmt(); 1879 } 1880 | switch_expr error { 1881 clear_warning_flags(); 1882 stmt_switch_expr_stmt(); 1883 } 1884 ; 1885 1886 if_without_else: /* see C99 6.8.4 */ 1887 if_expr statement 1888 | if_expr error 1889 ; 1890 1891 if_expr: /* see C99 6.8.4 */ 1892 T_IF T_LPAREN expression T_RPAREN { 1893 stmt_if_expr($3); 1894 clear_warning_flags(); 1895 } 1896 ; 1897 1898 switch_expr: /* see C99 6.8.4 */ 1899 T_SWITCH T_LPAREN expression T_RPAREN { 1900 stmt_switch_expr($3); 1901 clear_warning_flags(); 1902 } 1903 ; 1904 1905 iteration_statement: /* C99 6.8.5 */ 1906 while_expr statement { 1907 clear_warning_flags(); 1908 stmt_while_expr_stmt(); 1909 } 1910 | while_expr error { 1911 clear_warning_flags(); 1912 stmt_while_expr_stmt(); 1913 } 1914 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1915 stmt_do_while_expr($4); 1916 suppress_fallthrough = false; 1917 } 1918 | do error { 1919 clear_warning_flags(); 1920 stmt_do_while_expr(NULL); 1921 } 1922 | for_exprs statement { 1923 clear_warning_flags(); 1924 stmt_for_exprs_stmt(); 1925 end_declaration_level(); 1926 block_level--; 1927 } 1928 | for_exprs error { 1929 clear_warning_flags(); 1930 stmt_for_exprs_stmt(); 1931 end_declaration_level(); 1932 block_level--; 1933 } 1934 ; 1935 1936 while_expr: /* see C99 6.8.5 */ 1937 T_WHILE T_LPAREN expression T_RPAREN { 1938 stmt_while_expr($3); 1939 clear_warning_flags(); 1940 } 1941 ; 1942 1943 do_statement: /* see C99 6.8.5 */ 1944 do statement { 1945 clear_warning_flags(); 1946 } 1947 ; 1948 1949 do: /* see C99 6.8.5 */ 1950 T_DO { 1951 stmt_do(); 1952 } 1953 ; 1954 1955 for_start: /* see C99 6.8.5 */ 1956 T_FOR T_LPAREN { 1957 begin_declaration_level(DLK_AUTO); 1958 block_level++; 1959 } 1960 ; 1961 1962 for_exprs: /* see C99 6.8.5 */ 1963 for_start 1964 begin_type_declaration_specifiers end_type 1965 notype_init_declarators T_SEMI 1966 expression_opt T_SEMI 1967 expression_opt T_RPAREN { 1968 /* variable declaration in for loop */ 1969 c99ism(325); 1970 stmt_for_exprs(NULL, $6, $8); 1971 clear_warning_flags(); 1972 } 1973 | for_start 1974 expression_opt T_SEMI 1975 expression_opt T_SEMI 1976 expression_opt T_RPAREN { 1977 stmt_for_exprs($2, $4, $6); 1978 clear_warning_flags(); 1979 } 1980 ; 1981 1982 jump_statement: /* C99 6.8.6 */ 1983 goto identifier T_SEMI { 1984 stmt_goto(getsym($2)); 1985 } 1986 | goto error T_SEMI { 1987 set_sym_kind(SK_VCFT); 1988 } 1989 | T_CONTINUE T_SEMI { 1990 stmt_continue(); 1991 } 1992 | T_BREAK T_SEMI { 1993 stmt_break(); 1994 } 1995 | T_RETURN sys T_SEMI { 1996 stmt_return($2, NULL); 1997 } 1998 | T_RETURN sys expression T_SEMI { 1999 stmt_return($2, $3); 2000 } 2001 ; 2002 2003 goto: /* see C99 6.8.6 */ 2004 T_GOTO { 2005 set_sym_kind(SK_LABEL); 2006 } 2007 ; 2008 2009 asm_statement: /* GCC extension */ 2010 T_ASM T_LPAREN read_until_rparen T_SEMI { 2011 dcs_set_asm(); 2012 } 2013 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2014 dcs_set_asm(); 2015 } 2016 | T_ASM error 2017 ; 2018 2019 read_until_rparen: /* helper for 'asm_statement' */ 2020 /* empty */ { 2021 read_until_rparen(); 2022 } 2023 ; 2024 2025 translation_unit: /* C99 6.9 */ 2026 external_declaration 2027 | translation_unit external_declaration 2028 ; 2029 2030 external_declaration: /* C99 6.9 */ 2031 function_definition { 2032 global_clean_up_decl(false); 2033 clear_warning_flags(); 2034 } 2035 | top_level_declaration { 2036 global_clean_up_decl(false); 2037 clear_warning_flags(); 2038 } 2039 | asm_statement /* GCC extension */ 2040 | T_SEMI { /* GCC extension */ 2041 /* 2042 * TODO: Only allow this in GCC mode, not in plain C99. 2043 * This is one of the top 10 warnings in the NetBSD build. 2044 */ 2045 if (!allow_trad && !allow_c99) { 2046 /* empty declaration */ 2047 error(0); 2048 } else if (allow_c90) { 2049 /* empty declaration */ 2050 warning(0); 2051 } 2052 } 2053 ; 2054 2055 /* 2056 * On the top level, lint allows several forms of declarations that it doesn't 2057 * allow in functions. For example, a single ';' is an empty declaration and 2058 * is supported by some compilers, but in a function it would be an empty 2059 * statement, not a declaration. This makes a difference in C90 mode, where 2060 * a statement must not be followed by a declaration. 2061 * 2062 * See 'declaration' for all other declarations. 2063 */ 2064 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2065 begin_type end_type notype_init_declarators T_SEMI { 2066 /* TODO: Make this an error in C99 mode as well. */ 2067 if (!allow_trad && !allow_c99) { 2068 /* old-style declaration; add 'int' */ 2069 error(1); 2070 } else if (allow_c90) { 2071 /* old-style declaration; add 'int' */ 2072 warning(1); 2073 } 2074 } 2075 | declaration 2076 | error T_SEMI { 2077 global_clean_up(); 2078 } 2079 | error T_RBRACE { 2080 global_clean_up(); 2081 } 2082 ; 2083 2084 function_definition: /* C99 6.9.1 */ 2085 func_declarator { 2086 if ($1->s_type->t_tspec != FUNC) { 2087 /* syntax error '%s' */ 2088 error(249, yytext); 2089 YYERROR; 2090 } 2091 if ($1->s_type->t_typedef) { 2092 /* ()-less function definition */ 2093 error(64); 2094 YYERROR; 2095 } 2096 check_extern_declaration($1); 2097 begin_function($1); 2098 block_level++; 2099 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2100 if (lwarn == LWARN_NONE) 2101 $1->s_used = true; 2102 } arg_declaration_list_opt { 2103 end_declaration_level(); 2104 block_level--; 2105 check_func_lint_directives(); 2106 check_func_old_style_parameters(); 2107 begin_control_statement(CS_FUNCTION_BODY); 2108 } compound_statement { 2109 end_function(); 2110 end_control_statement(CS_FUNCTION_BODY); 2111 } 2112 ; 2113 2114 func_declarator: 2115 begin_type end_type notype_declarator { 2116 if (!allow_trad) { 2117 /* old-style declaration; add 'int' */ 2118 error(1); 2119 } 2120 $$ = $3; 2121 } 2122 | begin_type_declmods end_type notype_declarator { 2123 if (!allow_trad) { 2124 /* old-style declaration; add 'int' */ 2125 error(1); 2126 } 2127 $$ = $3; 2128 } 2129 | begin_type_declaration_specifiers end_type type_declarator { 2130 $$ = $3; 2131 } 2132 ; 2133 2134 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2135 /* empty */ 2136 | arg_declaration_list 2137 ; 2138 2139 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2140 arg_declaration 2141 | arg_declaration_list arg_declaration 2142 /* XXX or better "arg_declaration error" ? */ 2143 | error 2144 ; 2145 2146 /* 2147 * "arg_declaration" is separated from "declaration" because it 2148 * needs other error handling. 2149 */ 2150 arg_declaration: 2151 begin_type_declmods end_type T_SEMI { 2152 /* empty declaration */ 2153 warning(2); 2154 } 2155 | begin_type_declmods end_type notype_init_declarators T_SEMI 2156 | begin_type_declaration_specifiers end_type T_SEMI { 2157 if (!dcs->d_nonempty_decl) { 2158 /* empty declaration */ 2159 warning(2); 2160 } else { 2161 /* '%s' declared in parameter declaration list */ 2162 warning(3, type_name(dcs->d_type)); 2163 } 2164 } 2165 | begin_type_declaration_specifiers end_type 2166 type_init_declarators T_SEMI { 2167 if (dcs->d_nonempty_decl) { 2168 /* '%s' declared in parameter declaration list */ 2169 warning(3, type_name(dcs->d_type)); 2170 } 2171 } 2172 | begin_type_declmods error 2173 | begin_type_declaration_specifiers error 2174 ; 2175 2176 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2177 gcc_attribute_specifier_list_opt: 2178 /* empty */ 2179 | gcc_attribute_specifier_list 2180 ; 2181 2182 gcc_attribute_specifier_list: 2183 gcc_attribute_specifier 2184 | gcc_attribute_specifier_list gcc_attribute_specifier 2185 ; 2186 2187 gcc_attribute_specifier: 2188 T_ATTRIBUTE T_LPAREN T_LPAREN { 2189 in_gcc_attribute = true; 2190 } gcc_attribute_list { 2191 in_gcc_attribute = false; 2192 } T_RPAREN T_RPAREN 2193 ; 2194 2195 gcc_attribute_list: 2196 gcc_attribute 2197 | gcc_attribute_list T_COMMA gcc_attribute 2198 ; 2199 2200 gcc_attribute: 2201 /* empty */ 2202 | T_NAME { 2203 const char *name = $1->sb_name; 2204 if (is_either(name, "packed", "__packed__")) 2205 dcs_add_packed(); 2206 else if (is_either(name, "used", "__used__") || 2207 is_either(name, "unused", "__unused__")) 2208 dcs_set_used(); 2209 else if (is_either(name, "fallthrough", "__fallthrough__")) 2210 suppress_fallthrough = true; 2211 } 2212 | T_NAME T_LPAREN T_RPAREN 2213 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2214 | type_qualifier { 2215 if (!$1.tq_const) 2216 yyerror("Bad attribute"); 2217 } 2218 ; 2219 2220 gcc_attribute_parameters: 2221 constant_expression 2222 | gcc_attribute_parameters T_COMMA constant_expression 2223 ; 2224 2225 sys: 2226 /* empty */ { 2227 $$ = in_system_header; 2228 } 2229 ; 2230 2231 %% 2232 2233 /* ARGSUSED */ 2234 int 2235 yyerror(const char *msg) 2236 { 2237 /* syntax error '%s' */ 2238 error(249, yytext); 2239 if (++sytxerr >= 5) 2240 norecover(); 2241 return 0; 2242 } 2243 2244 #if YYDEBUG && YYBYACC 2245 static const char * 2246 cgram_to_string(int token, YYSTYPE val) 2247 { 2248 2249 switch (token) { 2250 case T_INCDEC: 2251 return val.y_inc ? "++" : "--"; 2252 case T_MULTIPLICATIVE: 2253 case T_ADDITIVE: 2254 case T_SHIFT: 2255 case T_RELATIONAL: 2256 case T_EQUALITY: 2257 case T_OPASSIGN: 2258 return op_name(val.y_op); 2259 case T_SCLASS: 2260 return scl_name(val.y_scl); 2261 case T_TYPE: 2262 case T_STRUCT_OR_UNION: 2263 return tspec_name(val.y_tspec); 2264 case T_QUAL: 2265 return type_qualifiers_string(val.y_type_qualifiers); 2266 case T_FUNCTION_SPECIFIER: 2267 return function_specifier_name(val.y_function_specifier); 2268 case T_NAME: 2269 return val.y_name->sb_name; 2270 default: 2271 return "<none>"; 2272 } 2273 } 2274 #endif 2275 2276 static void 2277 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2278 { 2279 declare(decl, has_initializer, renaming); 2280 if (renaming != NULL) 2281 freeyyv(&renaming, T_NAME); 2282 } 2283 2284 /* 2285 * Discard all input tokens up to and including the next unmatched right 2286 * parenthesis. 2287 */ 2288 static void 2289 read_until_rparen(void) 2290 { 2291 int level; 2292 2293 if (yychar < 0) 2294 yychar = yylex(); 2295 freeyyv(&yylval, yychar); 2296 2297 level = 1; 2298 while (yychar > 0) { 2299 if (yychar == T_LPAREN) 2300 level++; 2301 if (yychar == T_RPAREN && --level == 0) 2302 break; 2303 freeyyv(&yylval, yychar = yylex()); 2304 } 2305 2306 yyclearin; 2307 } 2308 2309 static sym_t * 2310 symbolrename(sym_t *s, sbuf_t *sb) 2311 { 2312 if (sb != NULL) 2313 s->s_rename = sb->sb_name; 2314 return s; 2315 } 2316
Indexes created Thu Oct 02 14:10:14 GMT 2025