1 %{ 2 /* $NetBSD: cgram.y,v 1.533 2025/09/14 11:14:00 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 1.533 2025/09/14 11:14:00 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 balanced_token_sequence read_balanced_token_sequence(void); 73 static sym_t *symbolrename(sym_t *, sbuf_t *); 74 75 76 /* ARGSUSED */ 77 static void 78 clear_warning_flags_loc(const char *file, size_t line) 79 { 80 debug_step("%s:%zu: clearing flags", file, line); 81 reset_suppressions(); 82 saved_lwarn = LWARN_NOTHING_SAVED; 83 } 84 85 /* ARGSUSED */ 86 static void 87 save_warning_flags_loc(const char *file, size_t line) 88 { 89 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 90 saved_lwarn = lwarn; 91 } 92 93 /* ARGSUSED */ 94 static void 95 restore_warning_flags_loc(const char *file, size_t line) 96 { 97 if (saved_lwarn != LWARN_NOTHING_SAVED) { 98 lwarn = saved_lwarn; 99 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 100 } else 101 clear_warning_flags_loc(file, line); 102 } 103 104 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 105 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 106 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 107 108 static bool 109 is_either(const char *s, const char *a, const char *b) 110 { 111 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 112 } 113 114 static void 115 attribute_list_add(attribute_list *list, attribute attr) 116 { 117 if (list->len >= list->cap) { 118 attribute *old_attrs = list->attrs; 119 list->cap = 16 + 2 * list->cap; 120 list->attrs = block_zero_alloc( 121 list->cap * sizeof(*list->attrs), "attribute[]"); 122 if (list->len > 0) 123 memcpy(list->attrs, old_attrs, 124 list->len * sizeof(*list->attrs)); 125 } 126 list->attrs[list->len++] = attr; 127 } 128 129 static void 130 attribute_list_add_all(attribute_list *dst, attribute_list src) 131 { 132 for (size_t i = 0, n = src.len; i < n; i++) 133 attribute_list_add(dst, src.attrs[i]); 134 } 135 136 static attribute 137 new_attribute(const sbuf_t *prefix, const sbuf_t *name, 138 const balanced_token_sequence *arg) 139 { 140 attribute attr = { .name = xstrdup(name->sb_name) }; 141 if (prefix != NULL) 142 attr.prefix = xstrdup(prefix->sb_name); 143 if (arg != NULL) { 144 attr.arg = block_zero_alloc(sizeof(*attr.arg), 145 "balanced_token_sequence"); 146 *attr.arg = *arg; 147 } 148 return attr; 149 } 150 151 #if YYDEBUG && YYBYACC 152 #define YYSTYPE_TOSTRING cgram_to_string 153 #endif 154 155 %} 156 157 %expect 110 158 159 %union { 160 val_t *y_val; 161 sbuf_t *y_name; 162 sym_t *y_sym; 163 bool y_inc; 164 op_t y_op; 165 scl_t y_scl; 166 tspec_t y_tspec; 167 type_qualifiers y_type_qualifiers; 168 type_attributes y_type_attributes; 169 function_specifier y_function_specifier; 170 parameter_list y_parameter_list; 171 function_call *y_arguments; 172 type_t *y_type; 173 tnode_t *y_tnode; 174 range_t y_range; 175 buffer *y_string; 176 qual_ptr *y_qual_ptr; 177 bool y_seen_statement; 178 struct generic_association *y_generic; 179 array_size y_array_size; 180 bool y_in_system_header; 181 designation y_designation; 182 named_constant y_named_constant; 183 attribute y_attribute; 184 attribute_list y_attribute_list; 185 balanced_token_sequence y_tokens; 186 }; 187 188 /* for Bison: 189 %printer { 190 if (is_integer($$->v_tspec)) 191 fprintf(yyo, "%lld", (long long)$$->u.integer); 192 else 193 fprintf(yyo, "%Lg", $$->u.floating); 194 } <y_val> 195 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 196 %printer { 197 if ($$ == NULL) 198 fprintf(yyo, "<null_symbol>"); 199 else { 200 bool indented = debug_push_indented(true); 201 debug_sym("", $$, ""); 202 debug_pop_indented(indented); 203 } 204 } <y_sym> 205 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 206 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 207 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 208 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 209 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 210 %printer { fprintf(yyo, "%s", type_attributes_string($$)); } <y_type_attributes> 211 %printer { 212 fprintf(yyo, "%s", function_specifier_name($$)); 213 } <y_function_specifier> 214 %printer { 215 size_t n = 0; 216 for (const sym_t *p = $$.first; p != NULL; p = p->s_next) 217 n++; 218 fprintf(yyo, "%zu parameter%s", n, n != 1 ? "s" : ""); 219 } <y_parameter_list> 220 %printer { 221 fprintf(yyo, "function_call("); 222 for (size_t i = 0; i < $$->args_len; i++) 223 fprintf(yyo, "%s%s", i > 0 ? ", " : "", 224 expr_type_name($$->args[i])); 225 fprintf(yyo, ")"); 226 } <y_arguments> 227 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 228 %printer { 229 if ($$ == NULL) 230 fprintf(yyo, "<null>"); 231 else 232 fprintf(yyo, "%s '%s'", 233 op_name($$->tn_op), type_name($$->tn_type)); 234 } <y_tnode> 235 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 236 %printer { fprintf(yyo, "length %zu", $$->len); } <y_string> 237 %printer { 238 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 239 } <y_qual_ptr> 240 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 241 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 242 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 243 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 244 %printer { 245 if ($$.dn_len == 0) 246 fprintf(yyo, "(empty)"); 247 for (size_t i = 0; i < $$.dn_len; i++) { 248 const designator *dr = $$.dn_items + i; 249 if (dr->dr_kind == DK_MEMBER) 250 fprintf(yyo, ".%s", dr->dr_member->s_name); 251 else if (dr->dr_kind == DK_SUBSCRIPT) 252 fprintf(yyo, "[%zu]", dr->dr_subscript); 253 else 254 fprintf(yyo, "<scalar>"); 255 } 256 } <y_designation> 257 %printer { fprintf(yyo, "%s", named_constant_name($$)); } <y_named_constant> 258 */ 259 260 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 261 %token T_POINT T_ARROW 262 %token T_COMPLEMENT T_LOGNOT 263 %token <y_inc> T_INCDEC 264 %token T_SIZEOF 265 %token T_BUILTIN_OFFSETOF 266 %token T_TYPEOF 267 %token T_EXTENSION 268 %token T_ALIGNAS 269 %token T_ALIGNOF 270 %token T_ASTERISK 271 %token <y_op> T_MULTIPLICATIVE 272 %token <y_op> T_ADDITIVE 273 %token <y_op> T_SHIFT 274 %token <y_op> T_RELATIONAL 275 %token <y_op> T_EQUALITY 276 %token T_AMPER 277 %token T_BITXOR 278 %token T_BITOR 279 %token T_LOGAND 280 %token T_LOGOR 281 %token T_QUEST 282 %token T_COLON 283 %token T_ASSIGN 284 %token <y_op> T_OPASSIGN 285 %token T_COMMA 286 %token T_SEMI 287 %token T_ELLIPSIS 288 %token T_DCOLON 289 %token T_REAL 290 %token T_IMAG 291 %token T_GENERIC 292 293 /* storage classes (extern, static, auto, register and typedef) */ 294 %token <y_scl> T_SCLASS 295 %token <y_function_specifier> T_FUNCTION_SPECIFIER 296 297 /* 298 * predefined type keywords (char, int, short, long, unsigned, signed, 299 * float, double, void); see T_TYPENAME for types from typedef 300 */ 301 %token <y_tspec> T_TYPE 302 303 %token <y_type_qualifiers> T_QUAL 304 %token <y_type_qualifiers> T_ATOMIC 305 306 /* struct or union */ 307 %token <y_tspec> T_STRUCT_OR_UNION 308 309 /* remaining keywords */ 310 %token T_ASM 311 %token T_BREAK 312 %token T_CASE 313 %token T_CONTINUE 314 %token T_DEFAULT 315 %token T_DO 316 %token T_ELSE 317 %token T_ENUM 318 %token T_FOR 319 %token T_GOTO 320 %token T_IF 321 %token T_PACKED 322 %token T_RETURN 323 %token T_STATIC_ASSERT 324 %token T_SWITCH 325 %token T_SYMBOLRENAME 326 %token T_WHILE 327 328 %token T_ATTRIBUTE 329 330 %left T_THEN 331 %left T_ELSE 332 %right T_QUEST T_COLON 333 %left T_LOGOR 334 %left T_LOGAND 335 %left T_BITOR 336 %left T_BITXOR 337 %left T_AMPER 338 %left T_EQUALITY 339 %left T_RELATIONAL 340 %left T_SHIFT 341 %left T_ADDITIVE 342 %left T_ASTERISK T_MULTIPLICATIVE 343 344 %token <y_name> T_NAME 345 %token <y_name> T_TYPENAME 346 %token <y_val> T_CON 347 %token <y_named_constant> T_NAMED_CONSTANT 348 %token <y_string> T_STRING 349 350 /* No type for program. */ 351 %type <y_sym> identifier_sym 352 %type <y_name> identifier 353 %type <y_string> string 354 %type <y_tnode> primary_expression 355 %type <y_designation> member_designator 356 %type <y_tnode> generic_selection 357 %type <y_generic> generic_assoc_list 358 %type <y_generic> generic_association 359 %type <y_tnode> postfix_expression 360 %type <y_tnode> gcc_statement_expr_list 361 %type <y_tnode> gcc_statement_expr_item 362 %type <y_op> point_or_arrow 363 %type <y_arguments> argument_expression_list 364 %type <y_scl> storage_class_specifiers 365 %type <y_tnode> unary_expression 366 %type <y_tnode> cast_expression 367 %type <y_tnode> expression_opt 368 %type <y_tnode> conditional_expression 369 %type <y_tnode> assignment_expression 370 %type <y_tnode> expression 371 %type <y_tnode> constant_expression 372 /* No type for declaration_or_error. */ 373 /* No type for declaration. */ 374 /* No type for begin_type_declaration_specifiers. */ 375 /* No type for begin_type_declmods. */ 376 /* No type for begin_type_specifier_qualifier_list. */ 377 /* No type for begin_type_specifier_qualifier_list_postfix. */ 378 %type <y_type> begin_type_typespec 379 /* No type for begin_type_qualifier_list. */ 380 /* No type for declmod. */ 381 %type <y_type_attributes> type_attribute_list_opt 382 %type <y_type_attributes> type_attribute_list 383 %type <y_type_attributes> type_attribute 384 /* No type for begin_type. */ 385 /* No type for end_type. */ 386 /* No type for notype_init_declarator_list. */ 387 /* No type for type_init_declarator_list. */ 388 /* No type for notype_init_declarator. */ 389 /* No type for type_init_declarator. */ 390 %type <y_scl> storage_class_specifier 391 %type <y_type> type_type_specifier 392 %type <y_type> notype_type_specifier 393 %type <y_type> struct_or_union_specifier 394 %type <y_tspec> struct_or_union 395 %type <y_sym> braced_member_declaration_list 396 %type <y_sym> member_declaration_list_with_rbrace 397 %type <y_sym> member_declaration_list 398 %type <y_sym> member_declaration 399 %type <y_sym> notype_member_declarator_list 400 %type <y_sym> type_member_declarator_list 401 %type <y_sym> notype_member_declarator 402 %type <y_sym> type_member_declarator 403 %type <y_type> enum_specifier 404 /* No type for enum. */ 405 %type <y_sym> enum_declaration 406 %type <y_sym> enums_with_opt_comma 407 %type <y_sym> enumerator_list 408 %type <y_sym> enumerator 409 %type <y_type> atomic_type_specifier 410 /* No type for atomic. */ 411 %type <y_type_qualifiers> type_qualifier 412 %type <y_sym> notype_declarator 413 %type <y_sym> type_declarator 414 %type <y_sym> notype_direct_declarator 415 %type <y_sym> type_direct_declarator 416 %type <y_qual_ptr> pointer 417 %type <y_type_qualifiers> type_qualifier_list_opt 418 %type <y_type_qualifiers> type_qualifier_list 419 %type <y_sym> parameter_declaration 420 %type <y_sym> type_param_declarator 421 %type <y_sym> notype_param_declarator 422 %type <y_sym> direct_param_declarator 423 %type <y_sym> direct_notype_param_declarator 424 %type <y_parameter_list> param_list 425 %type <y_array_size> array_size_opt 426 %type <y_sym> identifier_list 427 %type <y_type> type_name 428 %type <y_sym> abstract_declaration 429 %type <y_parameter_list> abstract_decl_param_list 430 /* No type for abstract_decl_lparen. */ 431 %type <y_parameter_list> vararg_parameter_type_list 432 %type <y_parameter_list> parameter_type_list 433 %type <y_sym> abstract_declarator 434 %type <y_sym> direct_abstract_declarator 435 /* No type for braced_initializer. */ 436 /* No type for initializer. */ 437 /* No type for initializer_list. */ 438 /* No type for designation. */ 439 /* No type for designator_list. */ 440 /* No type for designator. */ 441 /* No type for static_assert_declaration. */ 442 %type <y_range> range 443 /* No type for init_lbrace. */ 444 /* No type for init_rbrace. */ 445 %type <y_attribute_list> attribute_specifier_sequence 446 %type <y_attribute_list> attribute_specifier 447 %type <y_attribute_list> attribute_list 448 %type <y_attribute> attribute 449 %type <y_tokens> attribute_argument_clause 450 %type <y_name> asm_or_symbolrename_opt 451 /* No type for statement. */ 452 /* No type for no_attr_statement. */ 453 /* No type for non_expr_statement. */ 454 /* No type for no_attr_non_expr_statement. */ 455 /* No type for label. */ 456 /* No type for labeled_statement. */ 457 /* No type for compound_statement. */ 458 /* No type for compound_statement_lbrace. */ 459 /* No type for compound_statement_rbrace. */ 460 %type <y_seen_statement> block_item_list 461 %type <y_seen_statement> block_item 462 /* No type for expression_statement. */ 463 /* No type for selection_statement. */ 464 /* No type for if_without_else. */ 465 /* No type for if_expr. */ 466 /* No type for switch_expr. */ 467 /* No type for iteration_statement. */ 468 /* No type for while_expr. */ 469 /* No type for do_statement. */ 470 /* No type for do. */ 471 /* No type for for_start. */ 472 /* No type for for_exprs. */ 473 /* No type for jump_statement. */ 474 /* No type for goto. */ 475 /* No type for asm_statement. */ 476 /* No type for read_until_rparen. */ 477 /* No type for translation_unit. */ 478 /* No type for external_declaration. */ 479 /* No type for top_level_declaration. */ 480 /* No type for function_definition. */ 481 %type <y_sym> func_declarator 482 /* No type for arg_declaration_list_opt. */ 483 /* No type for arg_declaration_list. */ 484 /* No type for arg_declaration. */ 485 %type <y_type_attributes> gcc_attribute_specifier_list_opt 486 %type <y_type_attributes> gcc_attribute_specifier_list 487 %type <y_type_attributes> gcc_attribute_specifier 488 %type <y_type_attributes> gcc_attribute_list 489 %type <y_type_attributes> gcc_attribute 490 %type <y_in_system_header> sys 491 492 %% 493 494 program: 495 /* empty */ { 496 /* TODO: Make this an error in C99 mode as well. */ 497 if (!allow_trad && !allow_c99) 498 /* empty translation unit */ 499 error(272); 500 else if (allow_c90) 501 /* empty translation unit */ 502 warning(272); 503 } 504 | translation_unit 505 ; 506 507 identifier_sym: /* helper for struct/union/enum */ 508 identifier { 509 $$ = getsym($1); 510 } 511 ; 512 513 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 514 identifier: 515 T_NAME { 516 debug_step("cgram: name '%s'", $1->sb_name); 517 $$ = $1; 518 } 519 | T_TYPENAME { 520 debug_step("cgram: typename '%s'", $1->sb_name); 521 $$ = $1; 522 } 523 ; 524 525 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 526 string: 527 T_STRING 528 | string T_STRING { 529 if (!allow_c90) 530 /* concatenated strings require C90 or later */ 531 warning(219); 532 $$ = cat_strings($1, $2); 533 } 534 ; 535 536 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1, C23 6.5.2 */ 537 primary_expression: 538 T_NAME { 539 bool sys_name, sys_next; 540 sys_name = in_system_header; 541 if (yychar < 0) 542 yychar = yylex(); 543 sys_next = in_system_header; 544 in_system_header = sys_name; 545 $$ = build_name(getsym($1), yychar == T_LPAREN); 546 in_system_header = sys_next; 547 } 548 | T_CON { 549 $$ = build_constant(gettyp($1->v_tspec), $1); 550 } 551 | T_NAMED_CONSTANT { 552 if ($1 == NC_NULLPTR) { 553 tnode_t *zero = expr_alloc_tnode(); 554 zero->tn_op = CON; 555 zero->tn_type = gettyp(INT); 556 zero->u.value.v_tspec = INT; 557 558 type_t *void_ptr = block_derive_type(gettyp(VOID), PTR); 559 $$ = convert(CVT, 0, void_ptr, zero); 560 $$->tn_sys = zero->tn_sys; 561 } else { 562 tnode_t *nc = expr_alloc_tnode(); 563 nc->tn_op = CON; 564 nc->tn_type = gettyp(BOOL); 565 nc->u.value.v_tspec = BOOL; 566 nc->u.value.u.integer = $1 == NC_TRUE ? 1 : 0; 567 $$ = nc; 568 } 569 } 570 | string { 571 $$ = build_string($1); 572 } 573 | T_LPAREN expression T_RPAREN { 574 if ($2 != NULL) 575 $2->tn_parenthesized = true; 576 $$ = $2; 577 } 578 | generic_selection 579 /* GCC primary-expression, see c_parser_postfix_expression */ 580 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 581 set_sym_kind(SK_MEMBER); 582 } member_designator T_RPAREN { 583 $$ = build_offsetof($3, $6); 584 } 585 ; 586 587 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 588 member_designator: 589 identifier { 590 $$ = (designation) { .dn_len = 0 }; 591 designation_push(&$$, DK_MEMBER, getsym($1), 0); 592 } 593 | member_designator T_LBRACK range T_RBRACK { 594 $$ = $1; 595 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 596 } 597 | member_designator T_POINT { 598 set_sym_kind(SK_MEMBER); 599 } identifier { 600 $$ = $1; 601 designation_push(&$$, DK_MEMBER, getsym($4), 0); 602 } 603 ; 604 605 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C23 6.5.2.1 */ 606 generic_selection: 607 T_GENERIC T_LPAREN assignment_expression T_COMMA 608 generic_assoc_list T_RPAREN { 609 /* generic selection requires C11 or later */ 610 c11ism(345); 611 $$ = build_generic_selection($3, $5); 612 } 613 ; 614 615 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C23 6.5.2.1 */ 616 generic_assoc_list: 617 generic_association 618 | generic_assoc_list T_COMMA generic_association { 619 $3->ga_prev = $1; 620 $$ = $3; 621 } 622 ; 623 624 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C23 6.5.2.1 */ 625 generic_association: 626 type_name T_COLON assignment_expression { 627 $$ = block_zero_alloc(sizeof(*$$), "generic"); 628 $$->ga_arg = $1; 629 $$->ga_result = $3; 630 } 631 | T_DEFAULT T_COLON assignment_expression { 632 $$ = block_zero_alloc(sizeof(*$$), "generic"); 633 $$->ga_arg = NULL; 634 $$->ga_result = $3; 635 } 636 ; 637 638 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.3.1 */ 639 postfix_expression: 640 primary_expression 641 | postfix_expression T_LBRACK sys expression T_RBRACK { 642 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 643 } 644 | postfix_expression T_LPAREN sys T_RPAREN { 645 function_call *call = 646 expr_zero_alloc(sizeof(*call), "function_call"); 647 $$ = build_function_call($1, $3, call); 648 } 649 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 650 $$ = build_function_call($1, $3, $4); 651 } 652 | postfix_expression point_or_arrow sys T_NAME { 653 $$ = build_member_access($1, $2, $3, $4); 654 } 655 | postfix_expression T_INCDEC sys { 656 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 657 } 658 /* Rule 'compound_literal' from C99 6.5.2.5. */ 659 | T_LPAREN type_name T_RPAREN { 660 sym_t *tmp = mktempsym($2); 661 begin_initialization(tmp); 662 cgram_declare(tmp, true, NULL); 663 } braced_initializer { 664 if (!allow_c99) 665 /* compound literals are a C99/GCC extension */ 666 gnuism(319); 667 $$ = build_name(current_initsym(), false); 668 end_initialization(); 669 } 670 /* Rule 'compound_literal' with storage classes from C23 6.5.3.6. */ 671 | T_LPAREN storage_class_specifiers type_name T_RPAREN { 672 sym_t *tmp = mktempsym($3); 673 tmp->s_scl = $2; 674 begin_initialization(tmp); 675 cgram_declare(tmp, true, NULL); 676 } braced_initializer { 677 if (!allow_c99) 678 /* compound literals are a C99/GCC extension */ 679 gnuism(319); 680 $$ = build_name(current_initsym(), false); 681 end_initialization(); 682 } 683 | T_LPAREN compound_statement_lbrace { 684 begin_statement_expr(); 685 } gcc_statement_expr_list { 686 do_statement_expr($4); 687 } compound_statement_rbrace T_RPAREN { 688 $$ = end_statement_expr(); 689 } 690 ; 691 692 /* 693 * The inner part of a GCC statement-expression of the form ({ ... }). 694 * 695 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 696 */ 697 gcc_statement_expr_list: 698 gcc_statement_expr_item 699 | gcc_statement_expr_list gcc_statement_expr_item { 700 $$ = $2; 701 } 702 ; 703 704 gcc_statement_expr_item: 705 declaration_or_error { 706 clear_warning_flags(); 707 $$ = NULL; 708 } 709 | non_expr_statement { 710 $$ = expr_alloc_tnode(); 711 $$->tn_type = gettyp(VOID); 712 } 713 | T_SEMI { 714 $$ = expr_alloc_tnode(); 715 $$->tn_type = gettyp(VOID); 716 } 717 | expression T_SEMI { 718 if ($1 == NULL) { /* in case of syntax errors */ 719 $$ = expr_alloc_tnode(); 720 $$->tn_type = gettyp(VOID); 721 } else { 722 /* XXX: do that only on the last name */ 723 if ($1->tn_op == NAME) 724 $1->u.sym->s_used = true; 725 expr($1, true, false, false, false, 726 "statement expression"); 727 suppress_fallthrough = false; 728 $$ = $1; 729 } 730 } 731 ; 732 733 point_or_arrow: /* helper for 'postfix_expression' */ 734 T_POINT { 735 set_sym_kind(SK_MEMBER); 736 $$ = POINT; 737 } 738 | T_ARROW { 739 set_sym_kind(SK_MEMBER); 740 $$ = ARROW; 741 } 742 ; 743 744 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.3.1 */ 745 argument_expression_list: 746 assignment_expression { 747 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 748 add_function_argument($$, $1); 749 } 750 | argument_expression_list T_COMMA assignment_expression { 751 $$ = $1; 752 add_function_argument($1, $3); 753 } 754 ; 755 756 757 /* C23 6.5.3.6 */ 758 /* The rule 'compound_literal' is inlined into 'postfix_expression'. */ 759 760 /* C23 6.5.3.6 */ 761 storage_class_specifiers: 762 storage_class_specifier 763 | storage_class_specifiers storage_class_specifier { 764 // TODO C23: maybe merge multiple storage class specifiers 765 $$ = $1; 766 } 767 ; 768 769 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3, C23 6.5.4 */ 770 unary_expression: 771 postfix_expression 772 | T_INCDEC sys unary_expression { 773 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 774 } 775 | T_AMPER sys cast_expression { 776 $$ = build_unary(ADDR, $2, $3); 777 } 778 | T_ASTERISK sys cast_expression { 779 $$ = build_unary(INDIR, $2, $3); 780 } 781 | T_ADDITIVE sys cast_expression { 782 if (!allow_c90 && $1 == PLUS) 783 /* unary '+' requires C90 or later */ 784 warning(100); 785 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 786 } 787 | T_COMPLEMENT sys cast_expression { 788 $$ = build_unary(COMPL, $2, $3); 789 } 790 | T_LOGNOT sys cast_expression { 791 $$ = build_unary(NOT, $2, $3); 792 } 793 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 794 $$ = build_unary(REAL, $2, $3); 795 } 796 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 797 $$ = build_unary(IMAG, $2, $3); 798 } 799 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 800 $$ = $2; 801 } 802 | T_SIZEOF unary_expression { 803 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 804 if ($$ != NULL) 805 check_expr_misc($2, 806 false, false, false, false, false, true); 807 } 808 | T_SIZEOF T_LPAREN type_name T_RPAREN { 809 $$ = build_sizeof($3); 810 } 811 | T_ALIGNOF unary_expression { 812 /* non type argument to alignof is a GCC extension */ 813 gnuism(349); 814 lint_assert($2 != NULL); 815 $$ = build_alignof($2->tn_type); 816 } 817 /* K&R ---, C90 ---, C99 ---, C11 6.5.3, C23 6.5.4.4 */ 818 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 819 /* TODO: c11ism */ 820 $$ = build_alignof($3); 821 } 822 ; 823 824 /* C23 6.5.4 */ 825 /* The rule 'unary_operator' is inlined into unary_expression. */ 826 827 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4, C23 6.5.5 */ 828 cast_expression: 829 unary_expression 830 | T_LPAREN type_name T_RPAREN sys cast_expression { 831 $$ = cast($5, $4, $2); 832 } 833 ; 834 835 expression_opt: 836 /* empty */ { 837 $$ = NULL; 838 } 839 | expression 840 ; 841 842 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 843 /* 'conditional_expression' also implements 'additive_expression'. */ 844 /* 'conditional_expression' also implements 'shift_expression'. */ 845 /* 'conditional_expression' also implements 'relational_expression'. */ 846 /* 'conditional_expression' also implements 'equality_expression'. */ 847 /* 'conditional_expression' also implements 'AND_expression'. */ 848 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 849 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 850 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 851 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 852 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15, C23 6.5.6 to 6.5.16 */ 853 conditional_expression: 854 cast_expression 855 | conditional_expression T_ASTERISK sys conditional_expression { 856 $$ = build_binary($1, MULT, $3, $4); 857 } 858 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 859 $$ = build_binary($1, $2, $3, $4); 860 } 861 | conditional_expression T_ADDITIVE sys conditional_expression { 862 $$ = build_binary($1, $2, $3, $4); 863 } 864 | conditional_expression T_SHIFT sys conditional_expression { 865 $$ = build_binary($1, $2, $3, $4); 866 } 867 | conditional_expression T_RELATIONAL sys conditional_expression { 868 $$ = build_binary($1, $2, $3, $4); 869 } 870 | conditional_expression T_EQUALITY sys conditional_expression { 871 $$ = build_binary($1, $2, $3, $4); 872 } 873 | conditional_expression T_AMPER sys conditional_expression { 874 $$ = build_binary($1, BITAND, $3, $4); 875 } 876 | conditional_expression T_BITXOR sys conditional_expression { 877 $$ = build_binary($1, BITXOR, $3, $4); 878 } 879 | conditional_expression T_BITOR sys conditional_expression { 880 $$ = build_binary($1, BITOR, $3, $4); 881 } 882 | conditional_expression T_LOGAND sys conditional_expression { 883 $$ = build_binary($1, LOGAND, $3, $4); 884 } 885 | conditional_expression T_LOGOR sys conditional_expression { 886 $$ = build_binary($1, LOGOR, $3, $4); 887 } 888 | conditional_expression T_QUEST sys 889 expression T_COLON sys conditional_expression { 890 $$ = build_binary($1, QUEST, $3, 891 build_binary($4, COLON, $6, $7)); 892 } 893 ; 894 895 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16, C23 6.5.17.1 */ 896 assignment_expression: 897 conditional_expression 898 | unary_expression T_ASSIGN sys assignment_expression { 899 $$ = build_binary($1, ASSIGN, $3, $4); 900 } 901 | unary_expression T_OPASSIGN sys assignment_expression { 902 $$ = build_binary($1, $2, $3, $4); 903 } 904 ; 905 906 /* C23 6.5.17.1 */ 907 /* The rule 'assignment_operator' is inlined into 'assignment_expression'. */ 908 909 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17, C23 6.5.18 */ 910 expression: 911 assignment_expression 912 | expression T_COMMA sys assignment_expression { 913 $$ = build_binary($1, COMMA, $3, $4); 914 } 915 ; 916 917 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 918 constant_expression: 919 conditional_expression 920 ; 921 922 declaration_or_error: 923 declaration 924 | error T_SEMI 925 ; 926 927 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7.1 */ 928 declaration: 929 begin_type_declmods end_type T_SEMI { 930 if (dcs->d_scl == TYPEDEF) 931 /* typedef declares no type name */ 932 warning(72); 933 else 934 /* empty declaration */ 935 warning(2); 936 } 937 | begin_type_declmods end_type notype_init_declarator_list T_SEMI { 938 if (dcs->d_scl == TYPEDEF) 939 /* syntax error '%s' */ 940 error(249, "missing base type for typedef"); 941 else 942 /* old-style declaration; add 'int' */ 943 error(1); 944 } 945 | begin_type_declaration_specifiers end_type T_SEMI { 946 if (dcs->d_scl == TYPEDEF) 947 /* typedef declares no type name */ 948 warning(72); 949 else if (!dcs->d_nonempty_decl) 950 /* empty declaration */ 951 warning(2); 952 } 953 | begin_type_declaration_specifiers end_type 954 type_init_declarator_list T_SEMI 955 | static_assert_declaration 956 ; 957 958 /* TODO: Implement 'declaration_specifiers' from C23 6.7.1. */ 959 960 begin_type_declaration_specifiers: /* see C99 6.7, C23 6.7.1 */ 961 begin_type_typespec { 962 dcs_add_type($1); 963 } 964 | begin_type_declmods type_type_specifier { 965 dcs_add_type($2); 966 } 967 | type_attribute begin_type_declaration_specifiers { 968 dcs_add_type_attributes($1); 969 } 970 | begin_type_declaration_specifiers declmod 971 | begin_type_declaration_specifiers notype_type_specifier { 972 dcs_add_type($2); 973 } 974 ; 975 976 begin_type_declmods: /* see C99 6.7 */ 977 begin_type type_qualifier { 978 dcs_add_qualifiers($2); 979 } 980 | begin_type T_SCLASS { 981 dcs_add_storage_class($2); 982 } 983 | begin_type T_FUNCTION_SPECIFIER { 984 dcs_add_function_specifier($2); 985 } 986 | begin_type_declmods declmod 987 ; 988 989 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 990 begin_type_specifier_qualifier_list_postfix 991 | type_attribute_list begin_type_specifier_qualifier_list_postfix 992 ; 993 994 begin_type_specifier_qualifier_list_postfix: 995 begin_type_typespec { 996 dcs_add_type($1); 997 } 998 | begin_type_qualifier_list type_type_specifier { 999 dcs_add_type($2); 1000 } 1001 | begin_type_specifier_qualifier_list_postfix type_qualifier { 1002 dcs_add_qualifiers($2); 1003 } 1004 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 1005 dcs_add_type($2); 1006 } 1007 | begin_type_specifier_qualifier_list_postfix type_attribute 1008 ; 1009 1010 begin_type_typespec: 1011 begin_type notype_type_specifier { 1012 $$ = $2; 1013 } 1014 | begin_type T_TYPENAME { 1015 $$ = getsym($2)->s_type; 1016 } 1017 ; 1018 1019 begin_type_qualifier_list: 1020 begin_type type_qualifier { 1021 dcs_add_qualifiers($2); 1022 } 1023 | begin_type_qualifier_list type_qualifier { 1024 dcs_add_qualifiers($2); 1025 } 1026 ; 1027 1028 declmod: 1029 type_qualifier { 1030 dcs_add_qualifiers($1); 1031 } 1032 | T_SCLASS { 1033 dcs_add_storage_class($1); 1034 } 1035 | T_FUNCTION_SPECIFIER { 1036 dcs_add_function_specifier($1); 1037 } 1038 | type_attribute_list { 1039 dcs_add_type_attributes($1); 1040 } 1041 ; 1042 1043 type_attribute_list_opt: 1044 /* empty */ { 1045 $$ = (type_attributes){ .used = false }; 1046 } 1047 | type_attribute_list 1048 ; 1049 1050 type_attribute_list: 1051 type_attribute 1052 | type_attribute_list type_attribute { 1053 $$ = merge_type_attributes($1, $2); 1054 } 1055 ; 1056 1057 type_attribute: /* See C11 6.7 declaration-specifiers */ 1058 gcc_attribute_specifier 1059 | T_ALIGNAS T_LPAREN type_type_specifier T_RPAREN { /* C11 6.7.5 */ 1060 dcs_add_alignas(build_sizeof($3)); 1061 $$ = no_type_attributes(); 1062 } 1063 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN { /* C11 6.7.5 */ 1064 dcs_add_alignas($3); 1065 $$ = no_type_attributes(); 1066 } 1067 | T_PACKED { 1068 dcs_add_packed(); 1069 $$ = no_type_attributes(); 1070 } 1071 ; 1072 1073 begin_type: 1074 /* empty */ { 1075 dcs_begin_type(); 1076 } 1077 | attribute_specifier_sequence { 1078 dcs_begin_type(); 1079 dcs->d_used = attributes_contain(&$1, "maybe_unused"); 1080 dcs->d_noreturn = attributes_contain(&$1, "noreturn"); 1081 } 1082 ; 1083 1084 end_type: 1085 /* empty */ { 1086 dcs_end_type(); 1087 } 1088 ; 1089 1090 /* TODO: Implement 'declaration_specifier' from C23 6.7.1. */ 1091 1092 /* 1093 * For an explanation of 'type' and 'notype' prefixes in the following rules, 1094 * see https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1095 */ 1096 1097 /* C23 6.7.1 */ 1098 /* The rule 'init_declarator_list' is split into the 'notype' and 'type' variants. */ 1099 1100 notype_init_declarator_list: 1101 notype_init_declarator 1102 | notype_init_declarator_list T_COMMA type_init_declarator 1103 ; 1104 1105 type_init_declarator_list: 1106 type_init_declarator 1107 | type_init_declarator_list T_COMMA type_init_declarator 1108 ; 1109 1110 /* C23 6.7.1 */ 1111 /* The rule 'init_declarator' is split into the 'notype' and 'type' variants. */ 1112 1113 notype_init_declarator: 1114 notype_declarator asm_or_symbolrename_opt { 1115 cgram_declare($1, false, $2); 1116 check_size($1); 1117 } 1118 | notype_declarator asm_or_symbolrename_opt { 1119 begin_initialization($1); 1120 cgram_declare($1, true, $2); 1121 } T_ASSIGN initializer { 1122 check_size($1); 1123 end_initialization(); 1124 } 1125 ; 1126 1127 type_init_declarator: 1128 type_declarator asm_or_symbolrename_opt { 1129 cgram_declare($1, false, $2); 1130 check_size($1); 1131 } 1132 | type_declarator asm_or_symbolrename_opt { 1133 begin_initialization($1); 1134 cgram_declare($1, true, $2); 1135 } T_ASSIGN initializer { 1136 if ($1->s_type->t_tspec != AUTO_TYPE) 1137 check_size($1); 1138 end_initialization(); 1139 } 1140 ; 1141 1142 1143 /* TODO: Implement 'attribute_declaration' from C23 6.7.1. */ 1144 1145 /* K&R ???, C90 ???, C99 ???, C11 ???, C23 6.7.2 */ 1146 storage_class_specifier: 1147 T_SCLASS 1148 ; 1149 1150 /* C99 6.7.2, C23 6.7.3.1 */ 1151 /* The rule 'type_specifier' is split into the 'notype' and 'type' variants. */ 1152 1153 type_type_specifier: 1154 notype_type_specifier 1155 | T_TYPENAME { 1156 $$ = getsym($1)->s_type; 1157 } 1158 ; 1159 1160 notype_type_specifier: /* see C99 6.7.2 */ 1161 T_TYPE { 1162 $$ = gettyp($1); 1163 } 1164 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 1165 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 1166 $$->t_typeof = true; 1167 } 1168 | atomic_type_specifier 1169 | struct_or_union_specifier { 1170 end_declaration_level(); 1171 $$ = $1; 1172 } 1173 | enum_specifier { 1174 end_declaration_level(); 1175 $$ = $1; 1176 } 1177 ; 1178 1179 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.3.2 */ 1180 struct_or_union_specifier: 1181 struct_or_union identifier_sym { 1182 /* 1183 * STDC requires that "struct a;" always introduces 1184 * a new tag if "a" is not declared at current level 1185 * 1186 * yychar is valid because otherwise the parser would not 1187 * have been able to decide if it must shift or reduce 1188 */ 1189 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1190 } 1191 | struct_or_union identifier_sym { 1192 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1193 } braced_member_declaration_list { 1194 $$ = complete_struct_or_union($4); 1195 } 1196 | struct_or_union { 1197 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1198 } braced_member_declaration_list { 1199 $$ = complete_struct_or_union($3); 1200 } 1201 | struct_or_union error { 1202 set_sym_kind(SK_VCFT); 1203 $$ = gettyp(INT); 1204 } 1205 ; 1206 1207 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.3.2 */ 1208 struct_or_union: 1209 T_STRUCT_OR_UNION { 1210 set_sym_kind(SK_TAG); 1211 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1212 dcs->d_sou_size_in_bits = 0; 1213 dcs->d_sou_align = 1; 1214 $$ = $1; 1215 } 1216 | struct_or_union type_attribute 1217 ; 1218 1219 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1220 T_LBRACE { 1221 set_sym_kind(SK_VCFT); 1222 } member_declaration_list_with_rbrace { 1223 $$ = $3; 1224 } 1225 ; 1226 1227 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1228 member_declaration_list T_RBRACE 1229 | T_RBRACE { 1230 /* XXX: Allowed since C23. */ 1231 $$ = NULL; 1232 } 1233 ; 1234 1235 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.3.2 */ 1236 /* Was named struct_declaration_list until C11. */ 1237 member_declaration_list: 1238 member_declaration 1239 | member_declaration_list member_declaration { 1240 $$ = concat_symbols($1, $2); 1241 } 1242 ; 1243 1244 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.3.2 */ 1245 /* Was named struct_declaration until C11. */ 1246 member_declaration: 1247 begin_type_qualifier_list end_type { 1248 /* ^^ There is no check for the missing type-specifier. */ 1249 /* too late, i know, but getsym() compensates it */ 1250 set_sym_kind(SK_MEMBER); 1251 } notype_member_declarator_list T_SEMI { 1252 set_sym_kind(SK_VCFT); 1253 $$ = $4; 1254 } 1255 | begin_type_specifier_qualifier_list end_type { 1256 set_sym_kind(SK_MEMBER); 1257 } type_member_declarator_list T_SEMI { 1258 set_sym_kind(SK_VCFT); 1259 $$ = $4; 1260 } 1261 | begin_type_qualifier_list end_type type_attribute_list_opt T_SEMI { 1262 /* syntax error '%s' */ 1263 error(249, "member without type"); 1264 $$ = NULL; 1265 } 1266 | begin_type_specifier_qualifier_list end_type T_SEMI { 1267 set_sym_kind(SK_VCFT); 1268 if (!allow_c11 && !allow_gcc) 1269 /* anonymous struct/union members is a C11 feature */ 1270 warning(49); 1271 if (is_struct_or_union(dcs->d_type->t_tspec)) 1272 $$ = declare_unnamed_member(); 1273 else { 1274 /* syntax error '%s' */ 1275 error(249, "unnamed member"); 1276 $$ = NULL; 1277 } 1278 } 1279 | static_assert_declaration { 1280 $$ = NULL; 1281 } 1282 | error T_SEMI { 1283 set_sym_kind(SK_VCFT); 1284 $$ = NULL; 1285 } 1286 ; 1287 1288 /* TODO: Implement 'specifier_qualifier_list' from C23 6.7.3.2. */ 1289 1290 /* TODO: Implement 'type_specifier_qualifier' from C23 6.7.3.2. */ 1291 1292 /* C23 6.7.3.2 */ 1293 /* The rule 'member_declarator_list' is split into the 'type' and 'notype' variants. */ 1294 /* Was named struct_declarator_list until C11. */ 1295 1296 notype_member_declarator_list: 1297 notype_member_declarator { 1298 $$ = declare_member($1); 1299 } 1300 | notype_member_declarator_list { 1301 set_sym_kind(SK_MEMBER); 1302 } T_COMMA type_member_declarator { 1303 $$ = concat_symbols($1, declare_member($4)); 1304 } 1305 ; 1306 1307 type_member_declarator_list: 1308 type_member_declarator { 1309 $$ = declare_member($1); 1310 } 1311 | type_member_declarator_list { 1312 set_sym_kind(SK_MEMBER); 1313 } T_COMMA type_member_declarator { 1314 $$ = concat_symbols($1, declare_member($4)); 1315 } 1316 ; 1317 1318 /* C23 6.7.3.2 */ 1319 /* The rule 'member_declarator' is split into the 'type' and 'notype' variants. */ 1320 /* Was named struct_declarator until C11. */ 1321 1322 notype_member_declarator: 1323 notype_declarator 1324 /* C99 6.7.2.1 */ 1325 | notype_declarator T_COLON constant_expression { 1326 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1327 } 1328 /* C99 6.7.2.1 */ 1329 | { 1330 set_sym_kind(SK_VCFT); 1331 } T_COLON constant_expression { 1332 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1333 } 1334 ; 1335 1336 type_member_declarator: 1337 type_declarator 1338 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1339 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1340 } 1341 | { 1342 set_sym_kind(SK_VCFT); 1343 } T_COLON constant_expression type_attribute_list_opt { 1344 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1345 } 1346 ; 1347 1348 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2, C23 6.7.3.5 */ 1349 enum_specifier: 1350 enum gcc_attribute_specifier_list_opt identifier_sym { 1351 $$ = make_tag_type($3, ENUM, false, false); 1352 } 1353 | enum gcc_attribute_specifier_list_opt identifier_sym { 1354 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1355 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1356 $$ = complete_enum($5); 1357 } 1358 | enum gcc_attribute_specifier_list_opt { 1359 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1360 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1361 $$ = complete_enum($4); 1362 } 1363 | enum error { 1364 set_sym_kind(SK_VCFT); 1365 $$ = gettyp(INT); 1366 } 1367 ; 1368 1369 enum: /* helper for C99 6.7.2.2 */ 1370 T_ENUM { 1371 set_sym_kind(SK_TAG); 1372 begin_declaration_level(DLK_ENUM); 1373 } 1374 ; 1375 1376 enum_declaration: /* helper for C99 6.7.2.2 */ 1377 T_LBRACE { 1378 set_sym_kind(SK_VCFT); 1379 enumval = 0; 1380 } enums_with_opt_comma T_RBRACE { 1381 $$ = $3; 1382 } 1383 ; 1384 1385 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1386 enumerator_list 1387 | enumerator_list T_COMMA { 1388 if (!allow_c99 && !allow_trad) 1389 /* trailing ',' in enum declaration requires C99 ... */ 1390 error(54); 1391 else 1392 /* trailing ',' in enum declaration requires C99 ... */ 1393 c99ism(54); 1394 $$ = $1; 1395 } 1396 ; 1397 1398 /* C99 6.7.2.2, C23 6.7.3.3 */ 1399 enumerator_list: 1400 enumerator 1401 | enumerator_list T_COMMA enumerator { 1402 $$ = concat_symbols($1, $3); 1403 } 1404 | error { 1405 $$ = NULL; 1406 } 1407 ; 1408 1409 /* C99 6.7.2.2, C23 6.7.3.3 */ 1410 enumerator: 1411 identifier_sym gcc_attribute_specifier_list_opt { 1412 $$ = enumeration_constant($1, enumval, true); 1413 } 1414 | identifier_sym gcc_attribute_specifier_list_opt 1415 T_ASSIGN constant_expression { 1416 $$ = enumeration_constant($1, to_int_constant($4, true), 1417 false); 1418 } 1419 ; 1420 1421 /* TODO: Implement 'enum_type_specifier' from C23 6.7.3.3. */ 1422 1423 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4, C23 6.7.3.5 */ 1424 atomic_type_specifier: 1425 atomic T_LPAREN type_name T_RPAREN { 1426 $$ = $3; 1427 } 1428 ; 1429 1430 atomic: /* helper */ 1431 T_ATOMIC { 1432 /* TODO: First fix c11ism, then use it here. */ 1433 if (!allow_c11) 1434 /* '_Atomic' requires C11 or later */ 1435 error(350); 1436 } 1437 ; 1438 1439 /* TODO: Implement 'typeof_specifier' from C23 6.7.3.6. */ 1440 1441 /* TODO: Implement 'typeof_specifier_argument' from C23 6.7.3.6. */ 1442 1443 /* C99 6.7.3, C23 6.7.4.1 */ 1444 type_qualifier: 1445 T_QUAL 1446 | atomic { 1447 $$ = (type_qualifiers){ .tq_atomic = true }; 1448 } 1449 ; 1450 1451 /* TODO: Implement 'function_specifier' from C23 6.7.5. */ 1452 1453 /* TODO: Implement 'alignment_specifier' from C23 6.7.6. */ 1454 1455 /* C23 6.7.7.1 */ 1456 /* The rule 'declarator' is split into the 'notype' and 'type' variants. */ 1457 1458 notype_declarator: 1459 notype_direct_declarator 1460 | pointer notype_direct_declarator { 1461 $$ = add_pointer($2, $1); 1462 } 1463 ; 1464 1465 type_declarator: 1466 type_direct_declarator 1467 | pointer type_direct_declarator { 1468 $$ = add_pointer($2, $1); 1469 } 1470 ; 1471 1472 /* C23 6.7.7.1 */ 1473 /* The rule 'direct_declarator' is split into the 'notype' and 'type' variants. */ 1474 1475 notype_direct_declarator: 1476 type_attribute_list_opt T_NAME { 1477 $$ = declarator_name(getsym($2)); 1478 } 1479 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1480 $$ = $3; 1481 } 1482 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1483 $$ = add_array($1, $3.has_dim, $3.dim); 1484 } 1485 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1486 $$ = add_function(symbolrename($1, $3), $2); 1487 end_declaration_level(); 1488 block_level--; 1489 } 1490 | notype_direct_declarator type_attribute 1491 ; 1492 1493 type_direct_declarator: 1494 type_attribute_list_opt identifier { 1495 /* TODO: dcs_add_type_attributes($1); */ 1496 $$ = declarator_name(getsym($2)); 1497 } 1498 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1499 /* TODO: dcs_add_type_attributes($1); */ 1500 $$ = $3; 1501 } 1502 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1503 $$ = add_array($1, $3.has_dim, $3.dim); 1504 } 1505 | type_direct_declarator param_list asm_or_symbolrename_opt { 1506 $$ = add_function(symbolrename($1, $3), $2); 1507 end_declaration_level(); 1508 block_level--; 1509 if ($2.used) 1510 $$->s_used = true; 1511 /* TODO: handle $2.noreturn */ 1512 } 1513 | type_direct_declarator type_attribute { 1514 $$ = $1; 1515 if ($2.used) 1516 $$->s_used = true; 1517 /* TODO: handle $2.noreturn */ 1518 if ($2.bit_width > 0) { 1519 tspec_t t = $$->s_type->t_tspec; 1520 lint_assert(t == INT || t == UINT); 1521 type_t *tp = block_dup_type($$->s_type); 1522 tp->t_tspec = 1523 #ifdef INT128_SIZE 1524 $2.bit_width == 128 ? (t == INT ? INT128 : UINT128) : 1525 #endif 1526 t == INT ? LLONG : ULLONG; 1527 $$->s_type = tp; 1528 } 1529 } 1530 ; 1531 1532 1533 /* TODO: Implement 'array_declarator' from C23 6.7.7.1. */ 1534 1535 /* TODO: Implement 'function_declarator' from C23 6.7.7.1. */ 1536 1537 /* C99 6.7.5, C23 6.7.7.1 */ 1538 pointer: 1539 T_ASTERISK type_qualifier_list_opt { 1540 $$ = xcalloc(1, sizeof(*$$)); 1541 add_type_qualifiers(&$$->qualifiers, $2); 1542 } 1543 | T_ASTERISK type_qualifier_list_opt pointer { 1544 $$ = xcalloc(1, sizeof(*$$)); 1545 add_type_qualifiers(&$$->qualifiers, $2); 1546 $$ = append_qualified_pointer($$, $3); 1547 } 1548 ; 1549 1550 /* see C99 6.7.5, C23 6.7.7.1 */ 1551 type_qualifier_list_opt: 1552 /* empty */ { 1553 $$ = (type_qualifiers){ .tq_const = false }; 1554 } 1555 | type_qualifier_list 1556 ; 1557 1558 /* C99 6.7.5 */ 1559 type_qualifier_list: 1560 type_qualifier 1561 | type_qualifier_list type_qualifier { 1562 $$ = $1; 1563 add_type_qualifiers(&$$, $2); 1564 } 1565 ; 1566 1567 /* TODO: Implement 'parameter_type_list' from C23 6.7.7.1. */ 1568 1569 /* TODO: Implement 'parameter_list' from C23 6.7.7.1. */ 1570 1571 /* C23 6.7.7.1 */ 1572 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1573 parameter_declaration: 1574 begin_type_declmods end_type { 1575 /* ^^ There is no check for the missing type-specifier. */ 1576 $$ = declare_parameter(abstract_name(), false); 1577 } 1578 | begin_type_declaration_specifiers end_type { 1579 $$ = declare_parameter(abstract_name(), false); 1580 } 1581 | begin_type_declmods end_type notype_param_declarator { 1582 /* ^^ There is no check for the missing type-specifier. */ 1583 $$ = declare_parameter($3, false); 1584 } 1585 /* 1586 * type_param_declarator is needed because of following conflict: 1587 * "typedef int a; f(int (a));" could be parsed as 1588 * "function with argument a of type int", or 1589 * "function with an unnamed (abstract) argument of type function". 1590 * This grammar realizes the second case. 1591 */ 1592 | begin_type_declaration_specifiers end_type type_param_declarator { 1593 $$ = declare_parameter($3, false); 1594 } 1595 | begin_type_declmods end_type abstract_declarator { 1596 /* ^^ There is no check for the missing type-specifier. */ 1597 $$ = declare_parameter($3, false); 1598 } 1599 | begin_type_declaration_specifiers end_type abstract_declarator { 1600 $$ = declare_parameter($3, false); 1601 } 1602 ; 1603 1604 /* 1605 * The two distinct rules type_param_declarator and notype_param_declarator 1606 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1607 * always treated as a typename, not an argument name. For example, after 1608 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1609 * "f(int (double));", not "f(int a);". 1610 */ 1611 type_param_declarator: 1612 direct_param_declarator 1613 | pointer direct_param_declarator { 1614 $$ = add_pointer($2, $1); 1615 } 1616 ; 1617 1618 notype_param_declarator: 1619 direct_notype_param_declarator 1620 | pointer direct_notype_param_declarator { 1621 $$ = add_pointer($2, $1); 1622 } 1623 ; 1624 1625 direct_param_declarator: 1626 identifier type_attribute_list { 1627 $$ = declarator_name(getsym($1)); 1628 if ($2.used) 1629 dcs_set_used(); 1630 /* TODO: dcs_add_type_attributes($2); */ 1631 } 1632 | identifier { 1633 $$ = declarator_name(getsym($1)); 1634 } 1635 | T_LPAREN notype_param_declarator T_RPAREN { 1636 $$ = $2; 1637 } 1638 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1639 gcc_attribute_specifier_list_opt { 1640 $$ = add_array($1, $3.has_dim, $3.dim); 1641 if ($5.used) 1642 dcs_set_used(); 1643 /* TODO: dcs_add_type_attributes($5); */ 1644 } 1645 | direct_param_declarator param_list asm_or_symbolrename_opt { 1646 $$ = add_function(symbolrename($1, $3), $2); 1647 end_declaration_level(); 1648 block_level--; 1649 if ($2.used) 1650 dcs_set_used(); 1651 /* TODO: handle $2.noreturn */ 1652 } 1653 ; 1654 1655 direct_notype_param_declarator: 1656 identifier { 1657 $$ = declarator_name(getsym($1)); 1658 } 1659 | T_LPAREN notype_param_declarator T_RPAREN { 1660 $$ = $2; 1661 } 1662 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1663 $$ = add_array($1, $3.has_dim, $3.dim); 1664 } 1665 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1666 $$ = add_function(symbolrename($1, $3), $2); 1667 end_declaration_level(); 1668 block_level--; 1669 } 1670 ; 1671 1672 param_list: 1673 T_LPAREN { 1674 block_level++; 1675 begin_declaration_level(DLK_PROTO_PARAMS); 1676 } identifier_list T_RPAREN { 1677 $$ = (parameter_list){ .first = $3, .identifier = true }; 1678 } 1679 | abstract_decl_param_list 1680 ; 1681 1682 array_size_opt: 1683 /* empty */ { 1684 $$.has_dim = false; 1685 $$.dim = 0; 1686 } 1687 | T_ASTERISK { 1688 /* since C99; variable length array of unspecified size */ 1689 $$.has_dim = false; /* TODO: maybe change to true */ 1690 $$.dim = 0; /* just as a placeholder */ 1691 } 1692 | type_qualifier_list_opt T_SCLASS constant_expression { 1693 /* C11 6.7.6.3p7 */ 1694 if ($2 != STATIC) 1695 yyerror("Bad attribute"); 1696 /* static array size requires C11 or later */ 1697 c11ism(343); 1698 $$.has_dim = true; 1699 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1700 } 1701 | type_qualifier { 1702 /* C11 6.7.6.2 */ 1703 if (!$1.tq_restrict) 1704 yyerror("Bad attribute"); 1705 $$.has_dim = true; 1706 $$.dim = 0; 1707 } 1708 | constant_expression { 1709 $$.has_dim = true; 1710 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1711 } 1712 ; 1713 1714 identifier_list: /* C99 6.7.5 */ 1715 T_NAME { 1716 $$ = old_style_function_parameter_name(getsym($1)); 1717 } 1718 | identifier_list T_COMMA T_NAME { 1719 $$ = concat_symbols($1, 1720 old_style_function_parameter_name(getsym($3))); 1721 } 1722 | identifier_list error 1723 ; 1724 1725 /* C99 6.7.6, C23 6.7.8 */ 1726 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1727 type_name: 1728 { 1729 begin_declaration_level(DLK_ABSTRACT); 1730 } abstract_declaration { 1731 end_declaration_level(); 1732 $$ = $2->s_type; 1733 } 1734 ; 1735 1736 abstract_declaration: /* specific to lint */ 1737 begin_type_qualifier_list end_type { 1738 $$ = declare_abstract_type(abstract_name()); 1739 } 1740 | begin_type_specifier_qualifier_list end_type { 1741 $$ = declare_abstract_type(abstract_name()); 1742 } 1743 | begin_type_qualifier_list end_type abstract_declarator { 1744 $$ = declare_abstract_type($3); 1745 } 1746 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1747 $$ = declare_abstract_type($3); 1748 } 1749 ; 1750 1751 abstract_decl_param_list: /* specific to lint */ 1752 abstract_decl_lparen T_RPAREN type_attribute_list_opt { 1753 $$ = (parameter_list){ .used = $3.used }; 1754 } 1755 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1756 type_attribute_list_opt { 1757 $$ = $2; 1758 $$.prototype = true; 1759 $$.used = $4.used; 1760 $$.noreturn = $4.noreturn; 1761 } 1762 | abstract_decl_lparen error T_RPAREN type_attribute_list_opt { 1763 $$ = (parameter_list){ .used = $4.used }; 1764 } 1765 ; 1766 1767 abstract_decl_lparen: /* specific to lint */ 1768 T_LPAREN { 1769 block_level++; 1770 begin_declaration_level(DLK_PROTO_PARAMS); 1771 } 1772 ; 1773 1774 vararg_parameter_type_list: /* specific to lint */ 1775 parameter_type_list 1776 | parameter_type_list T_COMMA T_ELLIPSIS { 1777 $$ = $1; 1778 $$.vararg = true; 1779 } 1780 | T_ELLIPSIS { 1781 /* TODO: C99 6.7.5 makes this an error as well. */ 1782 if (!allow_trad && !allow_c99) 1783 /* C90 to C17 require formal parameter before '...' */ 1784 error(84); 1785 else if (allow_c90) 1786 /* C90 to C17 require formal parameter before '...' */ 1787 warning(84); 1788 $$ = (parameter_list){ .vararg = true }; 1789 } 1790 ; 1791 1792 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1793 parameter_type_list: 1794 parameter_declaration { 1795 $$ = (parameter_list){ .first = $1 }; 1796 } 1797 | parameter_type_list T_COMMA parameter_declaration { 1798 $$ = $1; 1799 $$.first = concat_symbols($1.first, $3); 1800 } 1801 ; 1802 1803 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7, C23 6.7.8 */ 1804 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1805 abstract_declarator: 1806 pointer { 1807 $$ = add_pointer(abstract_name(), $1); 1808 } 1809 | direct_abstract_declarator 1810 | pointer direct_abstract_declarator { 1811 $$ = add_pointer($2, $1); 1812 } 1813 | type_attribute_list direct_abstract_declarator { 1814 $$ = $2; 1815 } 1816 | pointer type_attribute_list direct_abstract_declarator { 1817 $$ = add_pointer($3, $1); 1818 } 1819 ; 1820 1821 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7, C23 6.7.8 */ 1822 direct_abstract_declarator: 1823 /* TODO: sort rules according to C99 */ 1824 T_LPAREN abstract_declarator T_RPAREN { 1825 $$ = $2; 1826 } 1827 | T_LBRACK array_size_opt T_RBRACK { 1828 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1829 } 1830 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1831 $$ = add_array($1, $3.has_dim, $3.dim); 1832 } 1833 | abstract_decl_param_list asm_or_symbolrename_opt { 1834 sym_t *name = abstract_enclosing_name(); 1835 $$ = add_function(symbolrename(name, $2), $1); 1836 end_declaration_level(); 1837 block_level--; 1838 } 1839 | direct_abstract_declarator abstract_decl_param_list 1840 asm_or_symbolrename_opt { 1841 $$ = add_function(symbolrename($1, $3), $2); 1842 end_declaration_level(); 1843 block_level--; 1844 } 1845 | direct_abstract_declarator type_attribute_list 1846 ; 1847 1848 /* TODO: Implement 'array_abstract_declarator' from C23 6.7.8. */ 1849 1850 /* TODO: Implement 'function_abstract_declarator' from C23 6.7.8. */ 1851 1852 /* TODO: Implement 'typedef_name' from C23 6.7.9. */ 1853 1854 /* C23 6.7.11 */ 1855 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1856 braced_initializer: 1857 init_lbrace init_rbrace { 1858 /* empty initializer braces require C23 or later */ 1859 c23ism(353); 1860 } 1861 | init_lbrace initializer_list init_rbrace 1862 | init_lbrace initializer_list T_COMMA init_rbrace 1863 ; 1864 1865 /* C99 6.7.8, C23 6.7.11 */ 1866 initializer: 1867 assignment_expression { 1868 init_expr($1); 1869 } 1870 | init_lbrace init_rbrace { 1871 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1872 } 1873 | init_lbrace initializer_list init_rbrace 1874 | init_lbrace initializer_list T_COMMA init_rbrace 1875 /* XXX: What is this error handling for? */ 1876 | error 1877 ; 1878 1879 /* C99 6.7.8, C23 6.7.11 */ 1880 initializer_list: 1881 initializer 1882 | designation initializer 1883 | initializer_list T_COMMA initializer 1884 | initializer_list T_COMMA designation initializer 1885 ; 1886 1887 /* C99 6.7.8, C23 6.7.11 */ 1888 designation: 1889 { 1890 begin_designation(); 1891 } designator_list T_ASSIGN 1892 | identifier T_COLON { 1893 /* GCC style struct or union member name in initializer */ 1894 gnuism(315); 1895 begin_designation(); 1896 add_designator_member($1); 1897 } 1898 ; 1899 1900 /* C99 6.7.8, C23 6.7.11 */ 1901 designator_list: 1902 designator 1903 | designator_list designator 1904 ; 1905 1906 /* C99 6.7.8, C23 6.7.11 */ 1907 designator: 1908 T_LBRACK range T_RBRACK { 1909 if (!allow_c99) 1910 /* array initializer with designators is a C99 ... */ 1911 warning(321); 1912 add_designator_subscript($2); 1913 } 1914 | T_POINT identifier { 1915 if (!allow_c99) 1916 /* struct or union member name in initializer is ... */ 1917 warning(313); 1918 add_designator_member($2); 1919 } 1920 ; 1921 1922 /* C23 6.7.12 */ 1923 static_assert_declaration: 1924 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1925 T_RPAREN T_SEMI { 1926 /* '_Static_assert' requires C11 or later */ 1927 c11ism(354); 1928 } 1929 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1930 /* '_Static_assert' without message requires C23 or later */ 1931 c23ism(355); 1932 } 1933 ; 1934 1935 range: 1936 constant_expression { 1937 $$.lo = to_int_constant($1, true); 1938 $$.hi = $$.lo; 1939 } 1940 | constant_expression T_ELLIPSIS constant_expression { 1941 $$.lo = to_int_constant($1, true); 1942 $$.hi = to_int_constant($3, true); 1943 /* initialization with '[a...b]' is a GCC extension */ 1944 gnuism(340); 1945 } 1946 ; 1947 1948 init_lbrace: /* helper */ 1949 T_LBRACE { 1950 init_lbrace(); 1951 } 1952 ; 1953 1954 init_rbrace: /* helper */ 1955 T_RBRACE { 1956 init_rbrace(); 1957 } 1958 ; 1959 1960 /* C23 6.7.13.2 */ 1961 attribute_specifier_sequence: 1962 attribute_specifier { 1963 $$ = (attribute_list) { NULL, 0, 0 }; 1964 attribute_list_add_all(&$$, $1); 1965 } 1966 | attribute_specifier_sequence attribute_specifier { 1967 $$ = $1; 1968 attribute_list_add_all(&$$, $2); 1969 } 1970 ; 1971 1972 /* C23 6.7.13.2 */ 1973 attribute_specifier: 1974 T_LBRACK T_LBRACK attribute_list T_RBRACK T_RBRACK { 1975 $$ = $3; 1976 } 1977 ; 1978 1979 /* C23 6.7.13.2 */ 1980 attribute_list: 1981 /* empty */ { 1982 $$ = (attribute_list) { NULL, 0, 0 }; 1983 } 1984 | attribute { 1985 $$ = (attribute_list) { NULL, 0, 0 }; 1986 attribute_list_add(&$$, $1); 1987 } 1988 | attribute_list T_COMMA 1989 | attribute_list T_COMMA attribute { 1990 $$ = $1; 1991 attribute_list_add(&$$, $3); 1992 } 1993 ; 1994 1995 /* C23 6.7.13.2 */ 1996 attribute: 1997 identifier { 1998 $$ = new_attribute(NULL, $1, NULL); 1999 } 2000 | identifier T_DCOLON identifier { 2001 $$ = new_attribute($1, $3, NULL); 2002 } 2003 | identifier attribute_argument_clause { 2004 $$ = new_attribute(NULL, $1, &$2); 2005 } 2006 | identifier T_DCOLON identifier attribute_argument_clause { 2007 $$ = new_attribute($1, $3, &$4); 2008 } 2009 ; 2010 2011 /* The rule 'attribute_token' is inlined into 'attribute'. */ 2012 /* The rule 'standard_attribute' is inlined into 'attribute_token'. */ 2013 /* The rule 'attribute_prefixed_token' is inlined into 'attribute_token'. */ 2014 /* The rule 'attribute_prefix' is inlined into 'attribute_token'. */ 2015 2016 /* C23 6.7.13.2 */ 2017 attribute_argument_clause: 2018 T_LPAREN { 2019 $$ = read_balanced_token_sequence(); 2020 } 2021 ; 2022 2023 /* The rule 'balanced_token_sequence' is inlined into 'attribute_argument_clause'. */ 2024 /* The rule 'balanced_token' is inlined into 'balanced_token_sequence'. */ 2025 2026 asm_or_symbolrename_opt: /* GCC extensions */ 2027 /* empty */ { 2028 $$ = NULL; 2029 } 2030 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 2031 freeyyv(&$3, T_STRING); 2032 $$ = NULL; 2033 } 2034 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 2035 gcc_attribute_specifier_list_opt { 2036 $$ = $3; 2037 } 2038 ; 2039 2040 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8.1 */ 2041 statement: 2042 expression_statement 2043 | non_expr_statement 2044 ; 2045 2046 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 2047 no_attr_statement: 2048 expression_statement 2049 | no_attr_non_expr_statement 2050 ; 2051 2052 non_expr_statement: /* helper for C99 6.8 */ 2053 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 2054 | no_attr_non_expr_statement 2055 ; 2056 2057 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 2058 no_attr_non_expr_statement: 2059 labeled_statement 2060 | compound_statement 2061 | selection_statement 2062 | iteration_statement 2063 | jump_statement { 2064 suppress_fallthrough = false; 2065 } 2066 | asm_statement 2067 ; 2068 2069 /* TODO: Implement 'unlabeled_statement' from C23 6.8.1. */ 2070 2071 /* TODO: Implement 'primary_block' from C23 6.8.1. */ 2072 2073 /* TODO: Implement 'secondary_block' from C23 6.8.1. */ 2074 2075 /* C23 6.8.2 */ 2076 label: 2077 T_NAME T_COLON { 2078 set_sym_kind(SK_LABEL); 2079 named_label(getsym($1)); 2080 } 2081 | T_CASE constant_expression T_COLON { 2082 case_label($2); 2083 suppress_fallthrough = true; 2084 } 2085 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 2086 /* XXX: We don't fill all cases */ 2087 case_label($2); 2088 suppress_fallthrough = true; 2089 } 2090 | T_DEFAULT T_COLON { 2091 default_label(); 2092 suppress_fallthrough = true; 2093 } 2094 ; 2095 2096 /* C99 6.8.1, C23 6.8.2 */ 2097 labeled_statement: 2098 label gcc_attribute_specifier_list_opt no_attr_statement 2099 ; 2100 2101 /* C99 6.8.2, C23 6.8.3 */ 2102 compound_statement: 2103 compound_statement_lbrace compound_statement_rbrace 2104 | compound_statement_lbrace block_item_list compound_statement_rbrace 2105 ; 2106 2107 compound_statement_lbrace: 2108 T_LBRACE { 2109 block_level++; 2110 mem_block_level++; 2111 debug_step("%s: mem_block_level = %zu", 2112 "compound_statement_lbrace", mem_block_level); 2113 begin_declaration_level(DLK_AUTO); 2114 } 2115 ; 2116 2117 compound_statement_rbrace: 2118 T_RBRACE { 2119 end_declaration_level(); 2120 if (!in_statement_expr()) 2121 level_free_all(mem_block_level); /* leak */ 2122 mem_block_level--; 2123 debug_step("%s: mem_block_level = %zu", 2124 "compound_statement_rbrace", mem_block_level); 2125 block_level--; 2126 suppress_fallthrough = false; 2127 } 2128 ; 2129 2130 /* C99 6.8.2, C23 6.8.3 */ 2131 block_item_list: 2132 block_item 2133 | block_item_list block_item { 2134 if ($1 && !$2) 2135 /* declarations after statements is a C99 feature */ 2136 c99ism(327); 2137 $$ = $1 || $2; 2138 } 2139 ; 2140 2141 /* C99 6.8.2, C23 6.8.3 */ 2142 block_item: 2143 declaration_or_error { 2144 $$ = false; 2145 restore_warning_flags(); 2146 } 2147 | statement { 2148 $$ = true; 2149 restore_warning_flags(); 2150 } 2151 ; 2152 2153 /* C99 6.8.3, C23 6.8.4 */ 2154 expression_statement: 2155 expression T_SEMI { 2156 /* 2157 * Even though a "call statement" is not a formally defined 2158 * term in the C standards, it occurs so often that it's 2159 * helpful to have a distinguishable term for it. 2160 */ 2161 expr($1, false, false, false, false, 2162 $1 != NULL && $1->tn_op == CALL ? "call" : "expression"); 2163 suppress_fallthrough = false; 2164 if ($1 != NULL && $1->tn_op == CALL 2165 && $1->u.call->func->tn_type->t_subt->t_noreturn) 2166 stmt_call_noreturn(); 2167 } 2168 | T_SEMI { 2169 check_statement_reachable("empty"); 2170 suppress_fallthrough = false; 2171 } 2172 | attribute_specifier_sequence expression T_SEMI { 2173 debug_attribute_list(&$1); 2174 /* 2175 * Even though a "call statement" is not a formally defined 2176 * term in the C standards, it occurs so often that it's 2177 * helpful to have a distinguishable term for it. 2178 */ 2179 expr($2, false, false, false, false, 2180 $2 != NULL && $2->tn_op == CALL ? "call" : "expression"); 2181 suppress_fallthrough = false; 2182 } 2183 | attribute_specifier_sequence T_SEMI { 2184 bool is_fallthrough = attributes_contain(&$1, "fallthrough"); 2185 debug_attribute_list(&$1); 2186 check_statement_reachable( 2187 is_fallthrough ? "fallthrough" : "empty"); 2188 suppress_fallthrough = is_fallthrough; 2189 } 2190 ; 2191 2192 /* C99 6.8.4, C23 6.8.5.1 */ 2193 selection_statement: 2194 if_without_else %prec T_THEN { 2195 save_warning_flags(); 2196 stmt_if_then_stmt(); 2197 stmt_if_else_stmt(false); 2198 } 2199 | if_without_else T_ELSE { 2200 save_warning_flags(); 2201 stmt_if_then_stmt(); 2202 } statement { 2203 restore_warning_flags(); 2204 stmt_if_else_stmt(true); 2205 } 2206 | if_without_else T_ELSE error { 2207 clear_warning_flags(); 2208 stmt_if_else_stmt(false); 2209 } 2210 | switch_expr statement { 2211 clear_warning_flags(); 2212 stmt_switch_expr_stmt(); 2213 } 2214 | switch_expr error { 2215 clear_warning_flags(); 2216 stmt_switch_expr_stmt(); 2217 } 2218 ; 2219 2220 if_without_else: /* see C99 6.8.4 */ 2221 if_expr statement 2222 | if_expr error 2223 ; 2224 2225 if_expr: /* see C99 6.8.4 */ 2226 T_IF T_LPAREN expression T_RPAREN { 2227 stmt_if_expr($3); 2228 clear_warning_flags(); 2229 } 2230 ; 2231 2232 switch_expr: /* see C99 6.8.4 */ 2233 T_SWITCH T_LPAREN expression T_RPAREN { 2234 stmt_switch_expr($3); 2235 clear_warning_flags(); 2236 } 2237 ; 2238 2239 /* C99 6.8.5, C23 6.8.6.1 */ 2240 iteration_statement: 2241 while_expr statement { 2242 clear_warning_flags(); 2243 stmt_while_expr_stmt(); 2244 } 2245 | while_expr error { 2246 clear_warning_flags(); 2247 stmt_while_expr_stmt(); 2248 } 2249 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 2250 stmt_do_while_expr($4); 2251 suppress_fallthrough = false; 2252 } 2253 | do error { 2254 clear_warning_flags(); 2255 stmt_do_while_expr(NULL); 2256 } 2257 | for_exprs statement { 2258 clear_warning_flags(); 2259 stmt_for_exprs_stmt(); 2260 end_declaration_level(); 2261 block_level--; 2262 } 2263 | for_exprs error { 2264 clear_warning_flags(); 2265 stmt_for_exprs_stmt(); 2266 end_declaration_level(); 2267 block_level--; 2268 } 2269 ; 2270 2271 while_expr: /* see C99 6.8.5 */ 2272 T_WHILE T_LPAREN expression T_RPAREN { 2273 stmt_while_expr($3); 2274 clear_warning_flags(); 2275 } 2276 ; 2277 2278 do_statement: /* see C99 6.8.5 */ 2279 do statement { 2280 clear_warning_flags(); 2281 } 2282 ; 2283 2284 do: /* see C99 6.8.5 */ 2285 T_DO { 2286 stmt_do(); 2287 } 2288 ; 2289 2290 for_start: /* see C99 6.8.5 */ 2291 T_FOR T_LPAREN { 2292 begin_declaration_level(DLK_AUTO); 2293 block_level++; 2294 } 2295 ; 2296 2297 for_exprs: /* see C99 6.8.5 */ 2298 for_start 2299 begin_type_declaration_specifiers end_type 2300 notype_init_declarator_list T_SEMI 2301 expression_opt T_SEMI 2302 expression_opt T_RPAREN { 2303 /* variable declaration in for loop */ 2304 c99ism(325); 2305 stmt_for_exprs(NULL, $6, $8); 2306 clear_warning_flags(); 2307 } 2308 | for_start 2309 expression_opt T_SEMI 2310 expression_opt T_SEMI 2311 expression_opt T_RPAREN { 2312 stmt_for_exprs($2, $4, $6); 2313 clear_warning_flags(); 2314 } 2315 ; 2316 2317 /* C99 6.8.6, C23 6.8.7.1 */ 2318 jump_statement: 2319 goto identifier T_SEMI { 2320 stmt_goto(getsym($2)); 2321 } 2322 | goto error T_SEMI { 2323 set_sym_kind(SK_VCFT); 2324 } 2325 | T_CONTINUE T_SEMI { 2326 stmt_continue(); 2327 } 2328 | T_BREAK T_SEMI { 2329 stmt_break(); 2330 } 2331 | T_RETURN sys T_SEMI { 2332 stmt_return($2, NULL); 2333 } 2334 | T_RETURN sys expression T_SEMI { 2335 stmt_return($2, $3); 2336 } 2337 ; 2338 2339 goto: /* see C99 6.8.6 */ 2340 T_GOTO { 2341 set_sym_kind(SK_LABEL); 2342 } 2343 ; 2344 2345 asm_statement: /* GCC extension */ 2346 T_ASM T_LPAREN read_until_rparen T_SEMI { 2347 dcs_set_asm(); 2348 } 2349 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2350 dcs_set_asm(); 2351 } 2352 | T_ASM error 2353 ; 2354 2355 read_until_rparen: /* helper for 'asm_statement' */ 2356 /* empty */ { 2357 read_until_rparen(); 2358 } 2359 ; 2360 2361 /* C99 6.9, C23 6.9.1 */ 2362 translation_unit: 2363 external_declaration 2364 | translation_unit external_declaration 2365 ; 2366 2367 /* C99 6.9, C23 6.9.1 */ 2368 external_declaration: 2369 function_definition { 2370 global_clean_up_decl(false); 2371 clear_warning_flags(); 2372 } 2373 | top_level_declaration { 2374 global_clean_up_decl(false); 2375 clear_warning_flags(); 2376 } 2377 | asm_statement /* GCC extension */ 2378 | T_SEMI { /* GCC extension */ 2379 /* 2380 * TODO: Only allow this in GCC mode, not in plain C99. 2381 * This is one of the top 10 warnings in the NetBSD build. 2382 */ 2383 if (!allow_trad && !allow_c99) 2384 /* empty declaration */ 2385 error(0); 2386 else if (allow_c90) 2387 /* empty declaration */ 2388 warning(0); 2389 } 2390 ; 2391 2392 /* 2393 * On the top level, lint allows several forms of declarations that it doesn't 2394 * allow in functions. For example, a single ';' is an empty declaration and 2395 * is supported by some compilers, but in a function it would be an empty 2396 * statement, not a declaration. This makes a difference in C90 mode, where 2397 * a statement must not be followed by a declaration. 2398 * 2399 * See 'declaration' for all other declarations. 2400 */ 2401 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2402 begin_type end_type notype_init_declarator_list T_SEMI { 2403 /* TODO: Make this an error in C99 mode as well. */ 2404 if (!allow_trad && !allow_c99) 2405 /* old-style declaration; add 'int' */ 2406 error(1); 2407 else if (allow_c90) 2408 /* old-style declaration; add 'int' */ 2409 warning(1); 2410 } 2411 | declaration 2412 | error T_SEMI { 2413 global_clean_up(); 2414 } 2415 | error T_RBRACE { 2416 global_clean_up(); 2417 } 2418 ; 2419 2420 /* C99 6.9.1, C23 6.9.2 */ 2421 function_definition: 2422 func_declarator { 2423 if ($1->s_type->t_tspec != FUNC) { 2424 /* syntax error '%s' */ 2425 error(249, yytext); 2426 YYERROR; 2427 } 2428 if ($1->s_type->t_typedef) { 2429 /* ()-less function definition */ 2430 error(64); 2431 YYERROR; 2432 } 2433 check_extern_declaration($1); 2434 begin_function($1); 2435 block_level++; 2436 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2437 if (lwarn == LWARN_NONE) 2438 $1->s_used = true; 2439 } arg_declaration_list_opt { 2440 end_declaration_level(); 2441 block_level--; 2442 check_func_lint_directives(); 2443 check_func_old_style_parameters(); 2444 begin_control_statement(CS_FUNCTION_BODY); 2445 } compound_statement { 2446 end_function(); 2447 end_control_statement(CS_FUNCTION_BODY); 2448 } 2449 ; 2450 2451 func_declarator: 2452 begin_type end_type notype_declarator { 2453 if (!allow_trad) 2454 /* old-style declaration; add 'int' */ 2455 error(1); 2456 $$ = $3; 2457 } 2458 | begin_type_declmods end_type notype_declarator { 2459 if (!allow_trad) 2460 /* old-style declaration; add 'int' */ 2461 error(1); 2462 $$ = $3; 2463 } 2464 | begin_type_declaration_specifiers end_type type_declarator { 2465 $$ = $3; 2466 } 2467 ; 2468 2469 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2470 /* empty */ 2471 | arg_declaration_list 2472 ; 2473 2474 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2475 arg_declaration 2476 | arg_declaration_list arg_declaration 2477 /* XXX or better "arg_declaration error" ? */ 2478 | error 2479 ; 2480 2481 /* 2482 * "arg_declaration" is separated from "declaration" because it 2483 * needs other error handling. 2484 */ 2485 arg_declaration: 2486 begin_type_declmods end_type T_SEMI { 2487 /* empty declaration */ 2488 warning(2); 2489 } 2490 | begin_type_declmods end_type notype_init_declarator_list T_SEMI 2491 | begin_type_declaration_specifiers end_type T_SEMI { 2492 if (!dcs->d_nonempty_decl) 2493 /* empty declaration */ 2494 warning(2); 2495 else 2496 /* '%s' declared in parameter declaration list */ 2497 warning(3, type_name(dcs->d_type)); 2498 } 2499 | begin_type_declaration_specifiers end_type 2500 type_init_declarator_list T_SEMI { 2501 if (dcs->d_nonempty_decl) 2502 /* '%s' declared in parameter declaration list */ 2503 warning(3, type_name(dcs->d_type)); 2504 } 2505 | begin_type_declmods error 2506 | begin_type_declaration_specifiers error 2507 ; 2508 2509 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2510 gcc_attribute_specifier_list_opt: 2511 /* empty */ { 2512 $$ = no_type_attributes(); 2513 } 2514 | gcc_attribute_specifier_list 2515 ; 2516 2517 gcc_attribute_specifier_list: 2518 gcc_attribute_specifier 2519 | gcc_attribute_specifier_list gcc_attribute_specifier { 2520 $$ = merge_type_attributes($1, $2); 2521 } 2522 ; 2523 2524 gcc_attribute_specifier: 2525 T_ATTRIBUTE T_LPAREN T_LPAREN { 2526 in_gcc_attribute = true; 2527 } gcc_attribute_list { 2528 in_gcc_attribute = false; 2529 } T_RPAREN T_RPAREN { 2530 $$ = $5; 2531 } 2532 ; 2533 2534 gcc_attribute_list: 2535 gcc_attribute 2536 | gcc_attribute_list T_COMMA gcc_attribute { 2537 $$ = merge_type_attributes($1, $3); 2538 } 2539 ; 2540 2541 gcc_attribute: 2542 /* empty */ { 2543 $$ = no_type_attributes(); 2544 } 2545 | T_NAME { 2546 $$ = no_type_attributes(); 2547 const char *name = $1->sb_name; 2548 if (is_either(name, "packed", "__packed__")) 2549 dcs_add_packed(); 2550 else if (is_either(name, "used", "__used__") || 2551 is_either(name, "constructor", "__constructor__") || 2552 is_either(name, "unused", "__unused__")) 2553 $$.used = true; 2554 else if (is_either(name, "fallthrough", "__fallthrough__")) 2555 suppress_fallthrough = true; 2556 else if (is_either(name, "noreturn", "__noreturn__")) 2557 $$.noreturn = true; 2558 } 2559 | T_NAME T_LPAREN T_RPAREN { 2560 $$ = (type_attributes){ .used = false }; 2561 } 2562 | T_NAME T_LPAREN argument_expression_list T_RPAREN { 2563 const char *name = $1->sb_name; 2564 if (is_either(name, "aligned", "__aligned__") 2565 && $3->args_len == 1) 2566 dcs_add_alignas($3->args[0]); 2567 $$ = no_type_attributes(); 2568 if (is_either(name, "mode", "__mode__") 2569 && $3->args_len == 1 2570 && $3->args[0]->tn_op == NAME) { 2571 const char *arg_name = $3->args[0]->u.sym->s_name; 2572 if (strcmp(arg_name, "TI") == 0) 2573 $$.bit_width = 128; 2574 if (strcmp(arg_name, "DI") == 0) 2575 $$.bit_width = 64; 2576 } 2577 } 2578 | type_qualifier { 2579 if (!$1.tq_const) 2580 yyerror("Bad attribute"); 2581 $$ = no_type_attributes(); 2582 } 2583 ; 2584 2585 /* The rule 'function_body' from C23 6.9.2 is inlined into 'function_definition'. */ 2586 2587 sys: 2588 /* empty */ { 2589 $$ = in_system_header; 2590 } 2591 ; 2592 2593 %% 2594 2595 /* ARGSUSED */ 2596 int 2597 yyerror(const char *msg) 2598 { 2599 /* syntax error '%s' */ 2600 error(249, yytext); 2601 if (++sytxerr >= 5) 2602 norecover(); 2603 return 0; 2604 } 2605 2606 #if YYDEBUG && YYBYACC 2607 static const char * 2608 cgram_to_string(int tok, YYSTYPE val) 2609 { 2610 2611 switch (tok) { 2612 case T_INCDEC: 2613 return val.y_inc ? "++" : "--"; 2614 case T_MULTIPLICATIVE: 2615 case T_ADDITIVE: 2616 case T_SHIFT: 2617 case T_RELATIONAL: 2618 case T_EQUALITY: 2619 case T_OPASSIGN: 2620 return op_name(val.y_op); 2621 case T_SCLASS: 2622 return scl_name(val.y_scl); 2623 case T_TYPE: 2624 case T_STRUCT_OR_UNION: 2625 return tspec_name(val.y_tspec); 2626 case T_QUAL: 2627 return type_qualifiers_string(val.y_type_qualifiers); 2628 case T_FUNCTION_SPECIFIER: 2629 return function_specifier_name(val.y_function_specifier); 2630 case T_NAME: 2631 return val.y_name->sb_name; 2632 default: 2633 return "<none>"; 2634 } 2635 } 2636 #endif 2637 2638 static void 2639 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2640 { 2641 declare(decl, has_initializer, renaming); 2642 if (renaming != NULL) 2643 freeyyv(&renaming, T_NAME); 2644 } 2645 2646 /* 2647 * Discard all input tokens up to and including the next unmatched right 2648 * parenthesis. 2649 */ 2650 static void 2651 read_until_rparen(void) 2652 { 2653 int level; 2654 2655 if (yychar < 0) 2656 yychar = yylex(); 2657 freeyyv(&yylval, yychar); 2658 2659 level = 1; 2660 while (yychar > 0) { 2661 if (yychar == T_LPAREN) 2662 level++; 2663 if (yychar == T_RPAREN && --level == 0) 2664 break; 2665 freeyyv(&yylval, yychar = yylex()); 2666 } 2667 2668 yyclearin; 2669 } 2670 2671 static balanced_token_sequence 2672 read_balanced_token_sequence(void) 2673 { 2674 lint_assert(yychar < 0); 2675 balanced_token_sequence seq = lex_balanced(); 2676 yyclearin; 2677 return seq; 2678 } 2679 2680 static sym_t * 2681 symbolrename(sym_t *s, sbuf_t *sb) 2682 { 2683 if (sb != NULL) 2684 s->s_rename = sb->sb_name; 2685 return s; 2686 } 2687
Indexes created Sat Sep 20 22:09:52 GMT 2025