cgram.y revision 1.504
1 %{ 2 /* $NetBSD: cgram.y,v 1.504 2024/06/17 04:14:02 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 1.504 2024/06/17 04:14:02 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 function_specifier y_function_specifier; 169 parameter_list y_parameter_list; 170 function_call *y_arguments; 171 type_t *y_type; 172 tnode_t *y_tnode; 173 range_t y_range; 174 buffer *y_string; 175 qual_ptr *y_qual_ptr; 176 bool y_seen_statement; 177 struct generic_association *y_generic; 178 array_size y_array_size; 179 bool y_in_system_header; 180 designation y_designation; 181 named_constant y_named_constant; 182 attribute y_attribute; 183 attribute_list y_attribute_list; 184 balanced_token_sequence y_tokens; 185 }; 186 187 /* for Bison: 188 %printer { 189 if (is_integer($$->v_tspec)) 190 fprintf(yyo, "%lld", (long long)$$->u.integer); 191 else 192 fprintf(yyo, "%Lg", $$->u.floating); 193 } <y_val> 194 %printer { fprintf(yyo, "'%s'", $$ != NULL ? $$->sb_name : "<null>"); } <y_name> 195 %printer { 196 bool indented = debug_push_indented(true); 197 debug_sym("", $$, ""); 198 debug_pop_indented(indented); 199 } <y_sym> 200 %printer { fprintf(yyo, "%s", $$ ? "++" : "--"); } <y_inc> 201 %printer { fprintf(yyo, "%s", op_name($$)); } <y_op> 202 %printer { fprintf(yyo, "%s", scl_name($$)); } <y_scl> 203 %printer { fprintf(yyo, "%s", tspec_name($$)); } <y_tspec> 204 %printer { fprintf(yyo, "%s", type_qualifiers_string($$)); } <y_type_qualifiers> 205 %printer { 206 fprintf(yyo, "%s", function_specifier_name($$)); 207 } <y_function_specifier> 208 %printer { 209 size_t n = 0; 210 for (const sym_t *p = $$.first; p != NULL; p = p->s_next) 211 n++; 212 fprintf(yyo, "%zu parameter%s", n, n != 1 ? "s" : ""); 213 } <y_parameter_list> 214 %printer { fprintf(yyo, "%s", type_name($$)); } <y_type> 215 %printer { 216 if ($$ == NULL) 217 fprintf(yyo, "<null>"); 218 else 219 fprintf(yyo, "%s '%s'", 220 op_name($$->tn_op), type_name($$->tn_type)); 221 } <y_tnode> 222 %printer { fprintf(yyo, "%zu to %zu", $$.lo, $$.hi); } <y_range> 223 %printer { fprintf(yyo, "length %zu", $$->len); } <y_string> 224 %printer { 225 fprintf(yyo, "%s *", type_qualifiers_string($$->qualifiers)); 226 } <y_qual_ptr> 227 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_seen_statement> 228 %printer { fprintf(yyo, "%s", type_name($$->ga_arg)); } <y_generic> 229 %printer { fprintf(yyo, "%d", $$.dim); } <y_array_size> 230 %printer { fprintf(yyo, "%s", $$ ? "yes" : "no"); } <y_in_system_header> 231 %printer { 232 if ($$.dn_len == 0) 233 fprintf(yyo, "(empty)"); 234 for (size_t i = 0; i < $$.dn_len; i++) { 235 const designator *dr = $$.dn_items + i; 236 if (dr->dr_kind == DK_MEMBER) 237 fprintf(yyo, ".%s", dr->dr_member->s_name); 238 else if (dr->dr_kind == DK_SUBSCRIPT) 239 fprintf(yyo, "[%zu]", dr->dr_subscript); 240 else 241 fprintf(yyo, "<scalar>"); 242 } 243 } <y_designation> 244 %printer { fprintf(yyo, "%s", named_constant_name($$)); } <y_named_constant> 245 */ 246 247 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 248 %token T_POINT T_ARROW 249 %token T_COMPLEMENT T_LOGNOT 250 %token <y_inc> T_INCDEC 251 %token T_SIZEOF 252 %token T_BUILTIN_OFFSETOF 253 %token T_TYPEOF 254 %token T_EXTENSION 255 %token T_ALIGNAS 256 %token T_ALIGNOF 257 %token T_ASTERISK 258 %token <y_op> T_MULTIPLICATIVE 259 %token <y_op> T_ADDITIVE 260 %token <y_op> T_SHIFT 261 %token <y_op> T_RELATIONAL 262 %token <y_op> T_EQUALITY 263 %token T_AMPER 264 %token T_BITXOR 265 %token T_BITOR 266 %token T_LOGAND 267 %token T_LOGOR 268 %token T_QUEST 269 %token T_COLON 270 %token T_ASSIGN 271 %token <y_op> T_OPASSIGN 272 %token T_COMMA 273 %token T_SEMI 274 %token T_ELLIPSIS 275 %token T_DCOLON 276 %token T_REAL 277 %token T_IMAG 278 %token T_GENERIC 279 280 /* storage classes (extern, static, auto, register and typedef) */ 281 %token <y_scl> T_SCLASS 282 %token <y_function_specifier> T_FUNCTION_SPECIFIER 283 284 /* 285 * predefined type keywords (char, int, short, long, unsigned, signed, 286 * float, double, void); see T_TYPENAME for types from typedef 287 */ 288 %token <y_tspec> T_TYPE 289 290 %token <y_type_qualifiers> T_QUAL 291 %token <y_type_qualifiers> T_ATOMIC 292 293 /* struct or union */ 294 %token <y_tspec> T_STRUCT_OR_UNION 295 296 /* remaining keywords */ 297 %token T_ASM 298 %token T_BREAK 299 %token T_CASE 300 %token T_CONTINUE 301 %token T_DEFAULT 302 %token T_DO 303 %token T_ELSE 304 %token T_ENUM 305 %token T_FOR 306 %token T_GOTO 307 %token T_IF 308 %token T_PACKED 309 %token T_RETURN 310 %token T_SWITCH 311 %token T_SYMBOLRENAME 312 %token T_WHILE 313 %token T_STATIC_ASSERT 314 315 %token T_ATTRIBUTE 316 317 %left T_THEN 318 %left T_ELSE 319 %right T_QUEST T_COLON 320 %left T_LOGOR 321 %left T_LOGAND 322 %left T_BITOR 323 %left T_BITXOR 324 %left T_AMPER 325 %left T_EQUALITY 326 %left T_RELATIONAL 327 %left T_SHIFT 328 %left T_ADDITIVE 329 %left T_ASTERISK T_MULTIPLICATIVE 330 331 %token <y_name> T_NAME 332 %token <y_name> T_TYPENAME 333 %token <y_val> T_CON 334 %token <y_named_constant> T_NAMED_CONSTANT 335 %token <y_string> T_STRING 336 337 /* No type for program. */ 338 %type <y_sym> identifier_sym 339 %type <y_name> identifier 340 %type <y_string> string 341 %type <y_tnode> primary_expression 342 %type <y_designation> member_designator 343 %type <y_tnode> generic_selection 344 %type <y_generic> generic_assoc_list 345 %type <y_generic> generic_association 346 %type <y_tnode> postfix_expression 347 %type <y_tnode> gcc_statement_expr_list 348 %type <y_tnode> gcc_statement_expr_item 349 %type <y_op> point_or_arrow 350 %type <y_arguments> argument_expression_list 351 %type <y_scl> storage_class_specifiers 352 %type <y_tnode> unary_expression 353 %type <y_tnode> cast_expression 354 %type <y_tnode> expression_opt 355 %type <y_tnode> conditional_expression 356 %type <y_tnode> assignment_expression 357 %type <y_tnode> expression 358 %type <y_tnode> constant_expression 359 /* No type for declaration_or_error. */ 360 /* No type for declaration. */ 361 /* No type for begin_type_declaration_specifiers. */ 362 /* No type for begin_type_declmods. */ 363 /* No type for begin_type_specifier_qualifier_list. */ 364 /* No type for begin_type_specifier_qualifier_list_postfix. */ 365 %type <y_type> begin_type_typespec 366 /* No type for begin_type_qualifier_list. */ 367 /* No type for declmod. */ 368 /* No type for type_attribute_list_opt. */ 369 /* No type for type_attribute_list. */ 370 /* No type for type_attribute_opt. */ 371 /* No type for type_attribute. */ 372 /* No type for begin_type. */ 373 /* No type for end_type. */ 374 /* No type for notype_init_declarator_list. */ 375 /* No type for type_init_declarator_list. */ 376 /* No type for notype_init_declarator. */ 377 /* No type for type_init_declarator. */ 378 %type <y_scl> storage_class_specifier 379 %type <y_type> type_type_specifier 380 %type <y_type> notype_type_specifier 381 %type <y_type> struct_or_union_specifier 382 %type <y_tspec> struct_or_union 383 %type <y_sym> braced_member_declaration_list 384 %type <y_sym> member_declaration_list_with_rbrace 385 %type <y_sym> member_declaration_list 386 %type <y_sym> member_declaration 387 %type <y_sym> notype_member_declarator_list 388 %type <y_sym> type_member_declarator_list 389 %type <y_sym> notype_member_declarator 390 %type <y_sym> type_member_declarator 391 %type <y_type> enum_specifier 392 /* No type for enum. */ 393 %type <y_sym> enum_declaration 394 %type <y_sym> enums_with_opt_comma 395 %type <y_sym> enumerator_list 396 %type <y_sym> enumerator 397 %type <y_type> atomic_type_specifier 398 /* No type for atomic. */ 399 %type <y_type_qualifiers> type_qualifier 400 %type <y_sym> notype_declarator 401 %type <y_sym> type_declarator 402 %type <y_sym> notype_direct_declarator 403 %type <y_sym> type_direct_declarator 404 %type <y_qual_ptr> pointer 405 %type <y_type_qualifiers> type_qualifier_list_opt 406 %type <y_type_qualifiers> type_qualifier_list 407 %type <y_sym> parameter_declaration 408 %type <y_sym> type_param_declarator 409 %type <y_sym> notype_param_declarator 410 %type <y_sym> direct_param_declarator 411 %type <y_sym> direct_notype_param_declarator 412 %type <y_parameter_list> param_list 413 %type <y_array_size> array_size_opt 414 %type <y_sym> identifier_list 415 %type <y_type> type_name 416 %type <y_sym> abstract_declaration 417 %type <y_parameter_list> abstract_decl_param_list 418 /* No type for abstract_decl_lparen. */ 419 %type <y_parameter_list> vararg_parameter_type_list 420 %type <y_parameter_list> parameter_type_list 421 %type <y_sym> abstract_declarator 422 %type <y_sym> direct_abstract_declarator 423 /* No type for braced_initializer. */ 424 /* No type for initializer. */ 425 /* No type for initializer_list. */ 426 /* No type for designation. */ 427 /* No type for designator_list. */ 428 /* No type for designator. */ 429 /* No type for static_assert_declaration. */ 430 %type <y_range> range 431 /* No type for init_lbrace. */ 432 /* No type for init_rbrace. */ 433 %type <y_attribute_list> attribute_specifier_sequence 434 %type <y_attribute_list> attribute_specifier 435 %type <y_attribute_list> attribute_list 436 %type <y_attribute> attribute 437 %type <y_tokens> attribute_argument_clause 438 %type <y_name> asm_or_symbolrename_opt 439 /* No type for statement. */ 440 /* No type for no_attr_statement. */ 441 /* No type for non_expr_statement. */ 442 /* No type for no_attr_non_expr_statement. */ 443 /* No type for label. */ 444 /* No type for labeled_statement. */ 445 /* No type for compound_statement. */ 446 /* No type for compound_statement_lbrace. */ 447 /* No type for compound_statement_rbrace. */ 448 %type <y_seen_statement> block_item_list 449 %type <y_seen_statement> block_item 450 /* No type for expression_statement. */ 451 /* No type for selection_statement. */ 452 /* No type for if_without_else. */ 453 /* No type for if_expr. */ 454 /* No type for switch_expr. */ 455 /* No type for iteration_statement. */ 456 /* No type for while_expr. */ 457 /* No type for do_statement. */ 458 /* No type for do. */ 459 /* No type for for_start. */ 460 /* No type for for_exprs. */ 461 /* No type for jump_statement. */ 462 /* No type for goto. */ 463 /* No type for asm_statement. */ 464 /* No type for read_until_rparen. */ 465 /* No type for translation_unit. */ 466 /* No type for external_declaration. */ 467 /* No type for top_level_declaration. */ 468 /* No type for function_definition. */ 469 %type <y_sym> func_declarator 470 /* No type for arg_declaration_list_opt. */ 471 /* No type for arg_declaration_list. */ 472 /* No type for arg_declaration. */ 473 /* No type for gcc_attribute_specifier_list_opt. */ 474 /* No type for gcc_attribute_specifier_list. */ 475 /* No type for gcc_attribute_specifier. */ 476 /* No type for gcc_attribute_list. */ 477 /* No type for gcc_attribute. */ 478 %type <y_in_system_header> sys 479 480 %% 481 482 program: 483 /* empty */ { 484 /* TODO: Make this an error in C99 mode as well. */ 485 if (!allow_trad && !allow_c99) 486 /* empty translation unit */ 487 error(272); 488 else if (allow_c90) 489 /* empty translation unit */ 490 warning(272); 491 } 492 | translation_unit 493 ; 494 495 identifier_sym: /* helper for struct/union/enum */ 496 identifier { 497 $$ = getsym($1); 498 } 499 ; 500 501 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 502 identifier: 503 T_NAME { 504 debug_step("cgram: name '%s'", $1->sb_name); 505 $$ = $1; 506 } 507 | T_TYPENAME { 508 debug_step("cgram: typename '%s'", $1->sb_name); 509 $$ = $1; 510 } 511 ; 512 513 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 514 string: 515 T_STRING 516 | string T_STRING { 517 if (!allow_c90) 518 /* concatenated strings are illegal in traditional C */ 519 warning(219); 520 $$ = cat_strings($1, $2); 521 } 522 ; 523 524 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1, C23 6.5.2 */ 525 primary_expression: 526 T_NAME { 527 bool sys_name, sys_next; 528 sys_name = in_system_header; 529 if (yychar < 0) 530 yychar = yylex(); 531 sys_next = in_system_header; 532 in_system_header = sys_name; 533 $$ = build_name(getsym($1), yychar == T_LPAREN); 534 in_system_header = sys_next; 535 } 536 | T_CON { 537 $$ = build_constant(gettyp($1->v_tspec), $1); 538 } 539 | T_NAMED_CONSTANT { 540 if ($1 == NC_NULLPTR) { 541 tnode_t *zero = expr_alloc_tnode(); 542 zero->tn_op = CON; 543 zero->tn_type = gettyp(INT); 544 zero->u.value.v_tspec = INT; 545 546 type_t *void_ptr = block_derive_type(gettyp(VOID), PTR); 547 $$ = convert(CVT, 0, void_ptr, zero); 548 $$->tn_sys = zero->tn_sys; 549 } else { 550 tnode_t *nc = expr_alloc_tnode(); 551 nc->tn_op = CON; 552 nc->tn_type = gettyp(BOOL); 553 nc->u.value.v_tspec = BOOL; 554 nc->u.value.u.integer = $1 == NC_TRUE ? 1 : 0; 555 $$ = nc; 556 } 557 } 558 | string { 559 $$ = build_string($1); 560 } 561 | T_LPAREN expression T_RPAREN { 562 if ($2 != NULL) 563 $2->tn_parenthesized = true; 564 $$ = $2; 565 } 566 | generic_selection 567 /* GCC primary-expression, see c_parser_postfix_expression */ 568 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA { 569 set_sym_kind(SK_MEMBER); 570 } member_designator T_RPAREN { 571 $$ = build_offsetof($3, $6); 572 } 573 ; 574 575 /* K&R ---, C90 ---, C99 7.17p3, C11 7.19p3, C23 7.21p4 */ 576 member_designator: 577 identifier { 578 $$ = (designation) { .dn_len = 0 }; 579 designation_push(&$$, DK_MEMBER, getsym($1), 0); 580 } 581 | member_designator T_LBRACK range T_RBRACK { 582 $$ = $1; 583 designation_push(&$$, DK_SUBSCRIPT, NULL, $3.lo); 584 } 585 | member_designator T_POINT { 586 set_sym_kind(SK_MEMBER); 587 } identifier { 588 $$ = $1; 589 designation_push(&$$, DK_MEMBER, getsym($4), 0); 590 } 591 ; 592 593 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C23 6.5.2.1 */ 594 generic_selection: 595 T_GENERIC T_LPAREN assignment_expression T_COMMA 596 generic_assoc_list T_RPAREN { 597 /* generic selection requires C11 or later */ 598 c11ism(345); 599 $$ = build_generic_selection($3, $5); 600 } 601 ; 602 603 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C23 6.5.2.1 */ 604 generic_assoc_list: 605 generic_association 606 | generic_assoc_list T_COMMA generic_association { 607 $3->ga_prev = $1; 608 $$ = $3; 609 } 610 ; 611 612 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1, C23 6.5.2.1 */ 613 generic_association: 614 type_name T_COLON assignment_expression { 615 $$ = block_zero_alloc(sizeof(*$$), "generic"); 616 $$->ga_arg = $1; 617 $$->ga_result = $3; 618 } 619 | T_DEFAULT T_COLON assignment_expression { 620 $$ = block_zero_alloc(sizeof(*$$), "generic"); 621 $$->ga_arg = NULL; 622 $$->ga_result = $3; 623 } 624 ; 625 626 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.3.1 */ 627 postfix_expression: 628 primary_expression 629 | postfix_expression T_LBRACK sys expression T_RBRACK { 630 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 631 } 632 | postfix_expression T_LPAREN sys T_RPAREN { 633 function_call *call = 634 expr_zero_alloc(sizeof(*call), "function_call"); 635 $$ = build_function_call($1, $3, call); 636 } 637 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 638 $$ = build_function_call($1, $3, $4); 639 } 640 | postfix_expression point_or_arrow sys T_NAME { 641 $$ = build_member_access($1, $2, $3, $4); 642 } 643 | postfix_expression T_INCDEC sys { 644 $$ = build_unary($2 ? INCAFT : DECAFT, $3, $1); 645 } 646 /* Rule 'compound_literal' from C99 6.5.2.5. */ 647 | T_LPAREN type_name T_RPAREN { 648 sym_t *tmp = mktempsym($2); 649 begin_initialization(tmp); 650 cgram_declare(tmp, true, NULL); 651 } braced_initializer { 652 if (!allow_c99) 653 /* compound literals are a C99/GCC extension */ 654 gnuism(319); 655 $$ = build_name(current_initsym(), false); 656 end_initialization(); 657 } 658 /* Rule 'compound_literal' with storage classes from C23 6.5.3.6. */ 659 | T_LPAREN storage_class_specifiers type_name T_RPAREN { 660 sym_t *tmp = mktempsym($3); 661 tmp->s_scl = $2; 662 begin_initialization(tmp); 663 cgram_declare(tmp, true, NULL); 664 } braced_initializer { 665 if (!allow_c99) 666 /* compound literals are a C99/GCC extension */ 667 gnuism(319); 668 $$ = build_name(current_initsym(), false); 669 end_initialization(); 670 } 671 | T_LPAREN compound_statement_lbrace { 672 begin_statement_expr(); 673 } gcc_statement_expr_list { 674 do_statement_expr($4); 675 } compound_statement_rbrace T_RPAREN { 676 $$ = end_statement_expr(); 677 } 678 ; 679 680 /* 681 * The inner part of a GCC statement-expression of the form ({ ... }). 682 * 683 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 684 */ 685 gcc_statement_expr_list: 686 gcc_statement_expr_item 687 | gcc_statement_expr_list gcc_statement_expr_item { 688 $$ = $2; 689 } 690 ; 691 692 gcc_statement_expr_item: 693 declaration_or_error { 694 clear_warning_flags(); 695 $$ = NULL; 696 } 697 | non_expr_statement { 698 $$ = expr_alloc_tnode(); 699 $$->tn_type = gettyp(VOID); 700 } 701 | T_SEMI { 702 $$ = expr_alloc_tnode(); 703 $$->tn_type = gettyp(VOID); 704 } 705 | expression T_SEMI { 706 if ($1 == NULL) { /* in case of syntax errors */ 707 $$ = expr_alloc_tnode(); 708 $$->tn_type = gettyp(VOID); 709 } else { 710 /* XXX: do that only on the last name */ 711 if ($1->tn_op == NAME) 712 $1->u.sym->s_used = true; 713 expr($1, false, false, false, false); 714 suppress_fallthrough = false; 715 $$ = $1; 716 } 717 } 718 ; 719 720 point_or_arrow: /* helper for 'postfix_expression' */ 721 T_POINT { 722 set_sym_kind(SK_MEMBER); 723 $$ = POINT; 724 } 725 | T_ARROW { 726 set_sym_kind(SK_MEMBER); 727 $$ = ARROW; 728 } 729 ; 730 731 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2, C23 6.5.3.1 */ 732 argument_expression_list: 733 assignment_expression { 734 $$ = expr_zero_alloc(sizeof(*$$), "function_call"); 735 add_function_argument($$, $1); 736 } 737 | argument_expression_list T_COMMA assignment_expression { 738 $$ = $1; 739 add_function_argument($1, $3); 740 } 741 ; 742 743 744 /* C23 6.5.3.6 */ 745 /* The rule 'compound_literal' is inlined into 'postfix_expression'. */ 746 747 /* C23 6.5.3.6 */ 748 storage_class_specifiers: 749 storage_class_specifier 750 | storage_class_specifiers storage_class_specifier { 751 // TODO C23: maybe merge multiple storage class specifiers 752 $$ = $1; 753 } 754 ; 755 756 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3, C23 6.5.4 */ 757 unary_expression: 758 postfix_expression 759 | T_INCDEC sys unary_expression { 760 $$ = build_unary($1 ? INCBEF : DECBEF, $2, $3); 761 } 762 | T_AMPER sys cast_expression { 763 $$ = build_unary(ADDR, $2, $3); 764 } 765 | T_ASTERISK sys cast_expression { 766 $$ = build_unary(INDIR, $2, $3); 767 } 768 | T_ADDITIVE sys cast_expression { 769 if (!allow_c90 && $1 == PLUS) 770 /* unary '+' is illegal in traditional C */ 771 warning(100); 772 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 773 } 774 | T_COMPLEMENT sys cast_expression { 775 $$ = build_unary(COMPL, $2, $3); 776 } 777 | T_LOGNOT sys cast_expression { 778 $$ = build_unary(NOT, $2, $3); 779 } 780 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 781 $$ = build_unary(REAL, $2, $3); 782 } 783 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 784 $$ = build_unary(IMAG, $2, $3); 785 } 786 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 787 $$ = $2; 788 } 789 | T_SIZEOF unary_expression { 790 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 791 if ($$ != NULL) 792 check_expr_misc($2, 793 false, false, false, false, false, true); 794 } 795 | T_SIZEOF T_LPAREN type_name T_RPAREN { 796 $$ = build_sizeof($3); 797 } 798 | T_ALIGNOF unary_expression { 799 /* non type argument to alignof is a GCC extension */ 800 gnuism(349); 801 lint_assert($2 != NULL); 802 $$ = build_alignof($2->tn_type); 803 } 804 /* K&R ---, C90 ---, C99 ---, C11 6.5.3, C23 6.5.4.4 */ 805 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 806 /* TODO: c11ism */ 807 $$ = build_alignof($3); 808 } 809 ; 810 811 /* C23 6.5.4 */ 812 /* The rule 'unary_operator' is inlined into unary_expression. */ 813 814 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4, C23 6.5.5 */ 815 cast_expression: 816 unary_expression 817 | T_LPAREN type_name T_RPAREN sys cast_expression { 818 $$ = cast($5, $4, $2); 819 } 820 ; 821 822 expression_opt: 823 /* empty */ { 824 $$ = NULL; 825 } 826 | expression 827 ; 828 829 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 830 /* 'conditional_expression' also implements 'additive_expression'. */ 831 /* 'conditional_expression' also implements 'shift_expression'. */ 832 /* 'conditional_expression' also implements 'relational_expression'. */ 833 /* 'conditional_expression' also implements 'equality_expression'. */ 834 /* 'conditional_expression' also implements 'AND_expression'. */ 835 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 836 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 837 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 838 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 839 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15, C23 6.5.6 to 6.5.16 */ 840 conditional_expression: 841 cast_expression 842 | conditional_expression T_ASTERISK sys conditional_expression { 843 $$ = build_binary($1, MULT, $3, $4); 844 } 845 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 846 $$ = build_binary($1, $2, $3, $4); 847 } 848 | conditional_expression T_ADDITIVE sys conditional_expression { 849 $$ = build_binary($1, $2, $3, $4); 850 } 851 | conditional_expression T_SHIFT sys conditional_expression { 852 $$ = build_binary($1, $2, $3, $4); 853 } 854 | conditional_expression T_RELATIONAL sys conditional_expression { 855 $$ = build_binary($1, $2, $3, $4); 856 } 857 | conditional_expression T_EQUALITY sys conditional_expression { 858 $$ = build_binary($1, $2, $3, $4); 859 } 860 | conditional_expression T_AMPER sys conditional_expression { 861 $$ = build_binary($1, BITAND, $3, $4); 862 } 863 | conditional_expression T_BITXOR sys conditional_expression { 864 $$ = build_binary($1, BITXOR, $3, $4); 865 } 866 | conditional_expression T_BITOR sys conditional_expression { 867 $$ = build_binary($1, BITOR, $3, $4); 868 } 869 | conditional_expression T_LOGAND sys conditional_expression { 870 $$ = build_binary($1, LOGAND, $3, $4); 871 } 872 | conditional_expression T_LOGOR sys conditional_expression { 873 $$ = build_binary($1, LOGOR, $3, $4); 874 } 875 | conditional_expression T_QUEST sys 876 expression T_COLON sys conditional_expression { 877 $$ = build_binary($1, QUEST, $3, 878 build_binary($4, COLON, $6, $7)); 879 } 880 ; 881 882 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16, C23 6.5.17.1 */ 883 assignment_expression: 884 conditional_expression 885 | unary_expression T_ASSIGN sys assignment_expression { 886 $$ = build_binary($1, ASSIGN, $3, $4); 887 } 888 | unary_expression T_OPASSIGN sys assignment_expression { 889 $$ = build_binary($1, $2, $3, $4); 890 } 891 ; 892 893 /* C23 6.5.17.1 */ 894 /* The rule 'assignment_operator' is inlined into 'assignment_expression'. */ 895 896 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17, C23 6.5.18 */ 897 expression: 898 assignment_expression 899 | expression T_COMMA sys assignment_expression { 900 $$ = build_binary($1, COMMA, $3, $4); 901 } 902 ; 903 904 /* K&R ???, C90 ???, C99 6.6, C11 ???, C23 6.6 */ 905 constant_expression: 906 conditional_expression 907 ; 908 909 declaration_or_error: 910 declaration 911 | error T_SEMI 912 ; 913 914 /* K&R ???, C90 ???, C99 6.7, C11 ???, C23 6.7.1 */ 915 declaration: 916 begin_type_declmods end_type T_SEMI { 917 if (dcs->d_scl == TYPEDEF) 918 /* typedef declares no type name */ 919 warning(72); 920 else 921 /* empty declaration */ 922 warning(2); 923 } 924 | begin_type_declmods end_type notype_init_declarator_list T_SEMI { 925 if (dcs->d_scl == TYPEDEF) 926 /* syntax error '%s' */ 927 error(249, "missing base type for typedef"); 928 else 929 /* old-style declaration; add 'int' */ 930 error(1); 931 } 932 | begin_type_declaration_specifiers end_type T_SEMI { 933 if (dcs->d_scl == TYPEDEF) 934 /* typedef declares no type name */ 935 warning(72); 936 else if (!dcs->d_nonempty_decl) 937 /* empty declaration */ 938 warning(2); 939 } 940 | begin_type_declaration_specifiers end_type 941 type_init_declarator_list T_SEMI 942 | static_assert_declaration 943 ; 944 945 /* TODO: Implement 'declaration_specifiers' from C23 6.7.1. */ 946 947 begin_type_declaration_specifiers: /* see C99 6.7, C23 6.7.1 */ 948 begin_type_typespec { 949 dcs_add_type($1); 950 } 951 | begin_type_declmods type_type_specifier { 952 dcs_add_type($2); 953 } 954 | type_attribute begin_type_declaration_specifiers 955 | begin_type_declaration_specifiers declmod 956 | begin_type_declaration_specifiers notype_type_specifier { 957 dcs_add_type($2); 958 } 959 ; 960 961 begin_type_declmods: /* see C99 6.7 */ 962 begin_type type_qualifier { 963 dcs_add_qualifiers($2); 964 } 965 | begin_type T_SCLASS { 966 dcs_add_storage_class($2); 967 } 968 | begin_type T_FUNCTION_SPECIFIER { 969 dcs_add_function_specifier($2); 970 } 971 | begin_type_declmods declmod 972 ; 973 974 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 975 begin_type_specifier_qualifier_list_postfix 976 | type_attribute_list begin_type_specifier_qualifier_list_postfix 977 ; 978 979 begin_type_specifier_qualifier_list_postfix: 980 begin_type_typespec { 981 dcs_add_type($1); 982 } 983 | begin_type_qualifier_list type_type_specifier { 984 dcs_add_type($2); 985 } 986 | begin_type_specifier_qualifier_list_postfix type_qualifier { 987 dcs_add_qualifiers($2); 988 } 989 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 990 dcs_add_type($2); 991 } 992 | begin_type_specifier_qualifier_list_postfix type_attribute 993 ; 994 995 begin_type_typespec: 996 begin_type notype_type_specifier { 997 $$ = $2; 998 } 999 | begin_type T_TYPENAME { 1000 $$ = getsym($2)->s_type; 1001 } 1002 ; 1003 1004 begin_type_qualifier_list: 1005 begin_type type_qualifier { 1006 dcs_add_qualifiers($2); 1007 } 1008 | begin_type_qualifier_list type_qualifier { 1009 dcs_add_qualifiers($2); 1010 } 1011 ; 1012 1013 declmod: 1014 type_qualifier { 1015 dcs_add_qualifiers($1); 1016 } 1017 | T_SCLASS { 1018 dcs_add_storage_class($1); 1019 } 1020 | T_FUNCTION_SPECIFIER { 1021 dcs_add_function_specifier($1); 1022 } 1023 | type_attribute_list 1024 ; 1025 1026 type_attribute_list_opt: 1027 /* empty */ 1028 | type_attribute_list 1029 ; 1030 1031 type_attribute_list: 1032 type_attribute 1033 | type_attribute_list type_attribute 1034 ; 1035 1036 type_attribute_opt: 1037 /* empty */ 1038 | type_attribute 1039 ; 1040 1041 type_attribute: /* See C11 6.7 declaration-specifiers */ 1042 gcc_attribute_specifier 1043 | T_ALIGNAS T_LPAREN type_type_specifier T_RPAREN { /* C11 6.7.5 */ 1044 dcs_add_alignas(build_sizeof($3)); 1045 } 1046 | T_ALIGNAS T_LPAREN constant_expression T_RPAREN { /* C11 6.7.5 */ 1047 dcs_add_alignas($3); 1048 } 1049 | T_PACKED { 1050 dcs_add_packed(); 1051 } 1052 ; 1053 1054 begin_type: 1055 /* empty */ { 1056 dcs_begin_type(); 1057 } 1058 | attribute_specifier_sequence { 1059 dcs_begin_type(); 1060 } 1061 ; 1062 1063 end_type: 1064 /* empty */ { 1065 dcs_end_type(); 1066 } 1067 ; 1068 1069 /* TODO: Implement 'declaration_specifier' from C23 6.7.1. */ 1070 1071 /* 1072 * For an explanation of 'type' and 'notype' prefixes in the following rules, 1073 * see https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1074 */ 1075 1076 /* C23 6.7.1 */ 1077 /* The rule 'init_declarator_list' is split into the 'notype' and 'type' variants. */ 1078 1079 notype_init_declarator_list: 1080 notype_init_declarator 1081 | notype_init_declarator_list T_COMMA type_init_declarator 1082 ; 1083 1084 type_init_declarator_list: 1085 type_init_declarator 1086 | type_init_declarator_list T_COMMA type_init_declarator 1087 ; 1088 1089 /* C23 6.7.1 */ 1090 /* The rule 'init_declarator' is split into the 'notype' and 'type' variants. */ 1091 1092 notype_init_declarator: 1093 notype_declarator asm_or_symbolrename_opt { 1094 cgram_declare($1, false, $2); 1095 check_size($1); 1096 } 1097 | notype_declarator asm_or_symbolrename_opt { 1098 begin_initialization($1); 1099 cgram_declare($1, true, $2); 1100 } T_ASSIGN initializer { 1101 check_size($1); 1102 end_initialization(); 1103 } 1104 ; 1105 1106 type_init_declarator: 1107 type_declarator asm_or_symbolrename_opt { 1108 cgram_declare($1, false, $2); 1109 check_size($1); 1110 } 1111 | type_declarator asm_or_symbolrename_opt { 1112 begin_initialization($1); 1113 cgram_declare($1, true, $2); 1114 } T_ASSIGN initializer { 1115 check_size($1); 1116 end_initialization(); 1117 } 1118 ; 1119 1120 1121 /* TODO: Implement 'attribute_declaration' from C23 6.7.1. */ 1122 1123 /* K&R ???, C90 ???, C99 ???, C11 ???, C23 6.7.2 */ 1124 storage_class_specifier: 1125 T_SCLASS 1126 ; 1127 1128 /* C99 6.7.2, C23 6.7.3.1 */ 1129 /* The rule 'type_specifier' is split into the 'notype' and 'type' variants. */ 1130 1131 type_type_specifier: 1132 notype_type_specifier 1133 | T_TYPENAME { 1134 $$ = getsym($1)->s_type; 1135 } 1136 ; 1137 1138 notype_type_specifier: /* see C99 6.7.2 */ 1139 T_TYPE { 1140 $$ = gettyp($1); 1141 } 1142 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 1143 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 1144 $$->t_typeof = true; 1145 } 1146 | atomic_type_specifier 1147 | struct_or_union_specifier { 1148 end_declaration_level(); 1149 $$ = $1; 1150 } 1151 | enum_specifier { 1152 end_declaration_level(); 1153 $$ = $1; 1154 } 1155 ; 1156 1157 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.3.2 */ 1158 struct_or_union_specifier: 1159 struct_or_union identifier_sym { 1160 /* 1161 * STDC requires that "struct a;" always introduces 1162 * a new tag if "a" is not declared at current level 1163 * 1164 * yychar is valid because otherwise the parser would not 1165 * have been able to decide if it must shift or reduce 1166 */ 1167 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 1168 } 1169 | struct_or_union identifier_sym { 1170 dcs->d_tag_type = make_tag_type($2, $1, true, false); 1171 } braced_member_declaration_list { 1172 $$ = complete_struct_or_union($4); 1173 } 1174 | struct_or_union { 1175 dcs->d_tag_type = make_tag_type(NULL, $1, true, false); 1176 } braced_member_declaration_list { 1177 $$ = complete_struct_or_union($3); 1178 } 1179 | struct_or_union error { 1180 set_sym_kind(SK_VCFT); 1181 $$ = gettyp(INT); 1182 } 1183 ; 1184 1185 /* K&R ---, C90 ---, C99 6.7.2.1, C11 ???, C23 6.7.3.2 */ 1186 struct_or_union: 1187 T_STRUCT_OR_UNION { 1188 set_sym_kind(SK_TAG); 1189 begin_declaration_level($1 == STRUCT ? DLK_STRUCT : DLK_UNION); 1190 dcs->d_sou_size_in_bits = 0; 1191 dcs->d_sou_align = 1; 1192 $$ = $1; 1193 } 1194 | struct_or_union type_attribute 1195 ; 1196 1197 braced_member_declaration_list: /* see C99 6.7.2.1 */ 1198 T_LBRACE { 1199 set_sym_kind(SK_VCFT); 1200 } member_declaration_list_with_rbrace { 1201 $$ = $3; 1202 } 1203 ; 1204 1205 member_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 1206 member_declaration_list T_RBRACE 1207 | T_RBRACE { 1208 /* XXX: Allowed since C23. */ 1209 $$ = NULL; 1210 } 1211 ; 1212 1213 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.3.2 */ 1214 /* Was named struct_declaration_list until C11. */ 1215 member_declaration_list: 1216 member_declaration 1217 | member_declaration_list member_declaration { 1218 $$ = concat_symbols($1, $2); 1219 } 1220 ; 1221 1222 /* K&R ???, C90 ???, C99 6.7.2.1, C11 6.7.2.1, C23 6.7.3.2 */ 1223 /* Was named struct_declaration until C11. */ 1224 member_declaration: 1225 begin_type_qualifier_list end_type { 1226 /* ^^ There is no check for the missing type-specifier. */ 1227 /* too late, i know, but getsym() compensates it */ 1228 set_sym_kind(SK_MEMBER); 1229 } notype_member_declarator_list T_SEMI { 1230 set_sym_kind(SK_VCFT); 1231 $$ = $4; 1232 } 1233 | begin_type_specifier_qualifier_list end_type { 1234 set_sym_kind(SK_MEMBER); 1235 } type_member_declarator_list T_SEMI { 1236 set_sym_kind(SK_VCFT); 1237 $$ = $4; 1238 } 1239 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 1240 /* syntax error '%s' */ 1241 error(249, "member without type"); 1242 $$ = NULL; 1243 } 1244 | begin_type_specifier_qualifier_list end_type type_attribute_opt 1245 T_SEMI { 1246 set_sym_kind(SK_VCFT); 1247 if (!allow_c11 && !allow_gcc) 1248 /* anonymous struct/union members is a C11 feature */ 1249 warning(49); 1250 if (is_struct_or_union(dcs->d_type->t_tspec)) 1251 $$ = declare_unnamed_member(); 1252 else { 1253 /* syntax error '%s' */ 1254 error(249, "unnamed member"); 1255 $$ = NULL; 1256 } 1257 } 1258 | static_assert_declaration { 1259 $$ = NULL; 1260 } 1261 | error T_SEMI { 1262 set_sym_kind(SK_VCFT); 1263 $$ = NULL; 1264 } 1265 ; 1266 1267 /* TODO: Implement 'specifier_qualifier_list' from C23 6.7.3.2. */ 1268 1269 /* TODO: Implement 'type_specifier_qualifier' from C23 6.7.3.2. */ 1270 1271 /* C23 6.7.3.2 */ 1272 /* The rule 'member_declarator_list' is split into the 'type' and 'notype' variants. */ 1273 /* Was named struct_declarator_list until C11. */ 1274 1275 notype_member_declarator_list: 1276 notype_member_declarator { 1277 $$ = declare_member($1); 1278 } 1279 | notype_member_declarator_list { 1280 set_sym_kind(SK_MEMBER); 1281 } T_COMMA type_member_declarator { 1282 $$ = concat_symbols($1, declare_member($4)); 1283 } 1284 ; 1285 1286 type_member_declarator_list: 1287 type_member_declarator { 1288 $$ = declare_member($1); 1289 } 1290 | type_member_declarator_list { 1291 set_sym_kind(SK_MEMBER); 1292 } T_COMMA type_member_declarator { 1293 $$ = concat_symbols($1, declare_member($4)); 1294 } 1295 ; 1296 1297 /* C23 6.7.3.2 */ 1298 /* The rule 'member_declarator' is split into the 'type' and 'notype' variants. */ 1299 /* Was named struct_declarator until C11. */ 1300 1301 notype_member_declarator: 1302 notype_declarator 1303 /* C99 6.7.2.1 */ 1304 | notype_declarator T_COLON constant_expression { 1305 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1306 } 1307 /* C99 6.7.2.1 */ 1308 | { 1309 set_sym_kind(SK_VCFT); 1310 } T_COLON constant_expression { 1311 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1312 } 1313 ; 1314 1315 type_member_declarator: 1316 type_declarator 1317 | type_declarator T_COLON constant_expression type_attribute_list_opt { 1318 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1319 } 1320 | { 1321 set_sym_kind(SK_VCFT); 1322 } T_COLON constant_expression type_attribute_list_opt { 1323 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1324 } 1325 ; 1326 1327 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2, C23 6.7.3.5 */ 1328 enum_specifier: 1329 enum gcc_attribute_specifier_list_opt identifier_sym { 1330 $$ = make_tag_type($3, ENUM, false, false); 1331 } 1332 | enum gcc_attribute_specifier_list_opt identifier_sym { 1333 dcs->d_tag_type = make_tag_type($3, ENUM, true, false); 1334 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1335 $$ = complete_enum($5); 1336 } 1337 | enum gcc_attribute_specifier_list_opt { 1338 dcs->d_tag_type = make_tag_type(NULL, ENUM, true, false); 1339 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1340 $$ = complete_enum($4); 1341 } 1342 | enum error { 1343 set_sym_kind(SK_VCFT); 1344 $$ = gettyp(INT); 1345 } 1346 ; 1347 1348 enum: /* helper for C99 6.7.2.2 */ 1349 T_ENUM { 1350 set_sym_kind(SK_TAG); 1351 begin_declaration_level(DLK_ENUM); 1352 } 1353 ; 1354 1355 enum_declaration: /* helper for C99 6.7.2.2 */ 1356 T_LBRACE { 1357 set_sym_kind(SK_VCFT); 1358 enumval = 0; 1359 } enums_with_opt_comma T_RBRACE { 1360 $$ = $3; 1361 } 1362 ; 1363 1364 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1365 enumerator_list 1366 | enumerator_list T_COMMA { 1367 if (!allow_c99 && !allow_trad) 1368 /* trailing ',' in enum declaration requires C99 ... */ 1369 error(54); 1370 else 1371 /* trailing ',' in enum declaration requires C99 ... */ 1372 c99ism(54); 1373 $$ = $1; 1374 } 1375 ; 1376 1377 /* C99 6.7.2.2, C23 6.7.3.3 */ 1378 enumerator_list: 1379 enumerator 1380 | enumerator_list T_COMMA enumerator { 1381 $$ = concat_symbols($1, $3); 1382 } 1383 | error { 1384 $$ = NULL; 1385 } 1386 ; 1387 1388 /* C99 6.7.2.2, C23 6.7.3.3 */ 1389 enumerator: 1390 identifier_sym gcc_attribute_specifier_list_opt { 1391 $$ = enumeration_constant($1, enumval, true); 1392 } 1393 | identifier_sym gcc_attribute_specifier_list_opt 1394 T_ASSIGN constant_expression { 1395 $$ = enumeration_constant($1, to_int_constant($4, true), 1396 false); 1397 } 1398 ; 1399 1400 /* TODO: Implement 'enum_type_specifier' from C23 6.7.3.3. */ 1401 1402 /* K&R ---, C90 ---, C99 ---, C11 6.7.2.4, C23 6.7.3.5 */ 1403 atomic_type_specifier: 1404 atomic T_LPAREN type_name T_RPAREN { 1405 $$ = $3; 1406 } 1407 ; 1408 1409 atomic: /* helper */ 1410 T_ATOMIC { 1411 /* TODO: First fix c11ism, then use it here. */ 1412 if (!allow_c11) 1413 /* '_Atomic' requires C11 or later */ 1414 error(350); 1415 } 1416 ; 1417 1418 /* TODO: Implement 'typeof_specifier' from C23 6.7.3.6. */ 1419 1420 /* TODO: Implement 'typeof_specifier_argument' from C23 6.7.3.6. */ 1421 1422 /* C99 6.7.3, C23 6.7.4.1 */ 1423 type_qualifier: 1424 T_QUAL 1425 | atomic { 1426 $$ = (type_qualifiers){ .tq_atomic = true }; 1427 } 1428 ; 1429 1430 /* TODO: Implement 'function_specifier' from C23 6.7.5. */ 1431 1432 /* TODO: Implement 'alignment_specifier' from C23 6.7.6. */ 1433 1434 /* C23 6.7.7.1 */ 1435 /* The rule 'declarator' is split into the 'notype' and 'type' variants. */ 1436 1437 notype_declarator: 1438 notype_direct_declarator 1439 | pointer notype_direct_declarator { 1440 $$ = add_pointer($2, $1); 1441 } 1442 ; 1443 1444 type_declarator: 1445 type_direct_declarator 1446 | pointer type_direct_declarator { 1447 $$ = add_pointer($2, $1); 1448 } 1449 ; 1450 1451 /* C23 6.7.7.1 */ 1452 /* The rule 'direct_declarator' is split into the 'notype' and 'type' variants. */ 1453 1454 notype_direct_declarator: 1455 type_attribute_list_opt T_NAME { 1456 $$ = declarator_name(getsym($2)); 1457 } 1458 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1459 $$ = $3; 1460 } 1461 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1462 $$ = add_array($1, $3.has_dim, $3.dim); 1463 } 1464 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1465 $$ = add_function(symbolrename($1, $3), $2); 1466 end_declaration_level(); 1467 block_level--; 1468 } 1469 | notype_direct_declarator type_attribute 1470 ; 1471 1472 type_direct_declarator: 1473 type_attribute_list_opt identifier { 1474 $$ = declarator_name(getsym($2)); 1475 } 1476 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1477 $$ = $3; 1478 } 1479 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1480 $$ = add_array($1, $3.has_dim, $3.dim); 1481 } 1482 | type_direct_declarator param_list asm_or_symbolrename_opt { 1483 $$ = add_function(symbolrename($1, $3), $2); 1484 end_declaration_level(); 1485 block_level--; 1486 } 1487 | type_direct_declarator type_attribute 1488 ; 1489 1490 1491 /* TODO: Implement 'array_declarator' from C23 6.7.7.1. */ 1492 1493 /* TODO: Implement 'function_declarator' from C23 6.7.7.1. */ 1494 1495 /* C99 6.7.5, C23 6.7.7.1 */ 1496 pointer: 1497 T_ASTERISK type_qualifier_list_opt { 1498 $$ = xcalloc(1, sizeof(*$$)); 1499 add_type_qualifiers(&$$->qualifiers, $2); 1500 } 1501 | T_ASTERISK type_qualifier_list_opt pointer { 1502 $$ = xcalloc(1, sizeof(*$$)); 1503 add_type_qualifiers(&$$->qualifiers, $2); 1504 $$ = append_qualified_pointer($$, $3); 1505 } 1506 ; 1507 1508 /* see C99 6.7.5, C23 6.7.7.1 */ 1509 type_qualifier_list_opt: 1510 /* empty */ { 1511 $$ = (type_qualifiers){ .tq_const = false }; 1512 } 1513 | type_qualifier_list 1514 ; 1515 1516 /* C99 6.7.5 */ 1517 type_qualifier_list: 1518 type_qualifier 1519 | type_qualifier_list type_qualifier { 1520 $$ = $1; 1521 add_type_qualifiers(&$$, $2); 1522 } 1523 ; 1524 1525 /* TODO: Implement 'parameter_type_list' from C23 6.7.7.1. */ 1526 1527 /* TODO: Implement 'parameter_list' from C23 6.7.7.1. */ 1528 1529 /* C23 6.7.7.1 */ 1530 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1531 parameter_declaration: 1532 begin_type_declmods end_type { 1533 /* ^^ There is no check for the missing type-specifier. */ 1534 $$ = declare_parameter(abstract_name(), false); 1535 } 1536 | begin_type_declaration_specifiers end_type { 1537 $$ = declare_parameter(abstract_name(), false); 1538 } 1539 | begin_type_declmods end_type notype_param_declarator { 1540 /* ^^ There is no check for the missing type-specifier. */ 1541 $$ = declare_parameter($3, false); 1542 } 1543 /* 1544 * type_param_declarator is needed because of following conflict: 1545 * "typedef int a; f(int (a));" could be parsed as 1546 * "function with argument a of type int", or 1547 * "function with an unnamed (abstract) argument of type function". 1548 * This grammar realizes the second case. 1549 */ 1550 | begin_type_declaration_specifiers end_type type_param_declarator { 1551 $$ = declare_parameter($3, false); 1552 } 1553 | begin_type_declmods end_type abstract_declarator { 1554 /* ^^ There is no check for the missing type-specifier. */ 1555 $$ = declare_parameter($3, false); 1556 } 1557 | begin_type_declaration_specifiers end_type abstract_declarator { 1558 $$ = declare_parameter($3, false); 1559 } 1560 ; 1561 1562 /* 1563 * The two distinct rules type_param_declarator and notype_param_declarator 1564 * avoid a conflict in parameter lists. A typename enclosed in parentheses is 1565 * always treated as a typename, not an argument name. For example, after 1566 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1567 * "f(int (double));", not "f(int a);". 1568 */ 1569 type_param_declarator: 1570 direct_param_declarator 1571 | pointer direct_param_declarator { 1572 $$ = add_pointer($2, $1); 1573 } 1574 ; 1575 1576 notype_param_declarator: 1577 direct_notype_param_declarator 1578 | pointer direct_notype_param_declarator { 1579 $$ = add_pointer($2, $1); 1580 } 1581 ; 1582 1583 direct_param_declarator: 1584 identifier type_attribute_list { 1585 $$ = declarator_name(getsym($1)); 1586 } 1587 | identifier { 1588 $$ = declarator_name(getsym($1)); 1589 } 1590 | T_LPAREN notype_param_declarator T_RPAREN { 1591 $$ = $2; 1592 } 1593 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1594 gcc_attribute_specifier_list_opt { 1595 $$ = add_array($1, $3.has_dim, $3.dim); 1596 } 1597 | direct_param_declarator param_list asm_or_symbolrename_opt { 1598 $$ = add_function(symbolrename($1, $3), $2); 1599 end_declaration_level(); 1600 block_level--; 1601 } 1602 ; 1603 1604 direct_notype_param_declarator: 1605 identifier { 1606 $$ = declarator_name(getsym($1)); 1607 } 1608 | T_LPAREN notype_param_declarator T_RPAREN { 1609 $$ = $2; 1610 } 1611 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1612 $$ = add_array($1, $3.has_dim, $3.dim); 1613 } 1614 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1615 $$ = add_function(symbolrename($1, $3), $2); 1616 end_declaration_level(); 1617 block_level--; 1618 } 1619 ; 1620 1621 param_list: 1622 T_LPAREN { 1623 block_level++; 1624 begin_declaration_level(DLK_PROTO_PARAMS); 1625 } identifier_list T_RPAREN { 1626 $$ = (parameter_list){ .first = $3 }; 1627 } 1628 | abstract_decl_param_list 1629 ; 1630 1631 array_size_opt: 1632 /* empty */ { 1633 $$.has_dim = false; 1634 $$.dim = 0; 1635 } 1636 | T_ASTERISK { 1637 /* since C99; variable length array of unspecified size */ 1638 $$.has_dim = false; /* TODO: maybe change to true */ 1639 $$.dim = 0; /* just as a placeholder */ 1640 } 1641 | type_qualifier_list_opt T_SCLASS constant_expression { 1642 /* C11 6.7.6.3p7 */ 1643 if ($2 != STATIC) 1644 yyerror("Bad attribute"); 1645 /* static array size requires C11 or later */ 1646 c11ism(343); 1647 $$.has_dim = true; 1648 $$.dim = $3 == NULL ? 0 : to_int_constant($3, false); 1649 } 1650 | type_qualifier { 1651 /* C11 6.7.6.2 */ 1652 if (!$1.tq_restrict) 1653 yyerror("Bad attribute"); 1654 $$.has_dim = true; 1655 $$.dim = 0; 1656 } 1657 | constant_expression { 1658 $$.has_dim = true; 1659 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1660 } 1661 ; 1662 1663 identifier_list: /* C99 6.7.5 */ 1664 T_NAME { 1665 $$ = old_style_function_parameter_name(getsym($1)); 1666 } 1667 | identifier_list T_COMMA T_NAME { 1668 $$ = concat_symbols($1, 1669 old_style_function_parameter_name(getsym($3))); 1670 } 1671 | identifier_list error 1672 ; 1673 1674 /* C99 6.7.6, C23 6.7.8 */ 1675 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1676 type_name: 1677 { 1678 begin_declaration_level(DLK_ABSTRACT); 1679 } abstract_declaration { 1680 end_declaration_level(); 1681 $$ = $2->s_type; 1682 } 1683 ; 1684 1685 abstract_declaration: /* specific to lint */ 1686 begin_type_qualifier_list end_type { 1687 $$ = declare_abstract_type(abstract_name()); 1688 } 1689 | begin_type_specifier_qualifier_list end_type { 1690 $$ = declare_abstract_type(abstract_name()); 1691 } 1692 | begin_type_qualifier_list end_type abstract_declarator { 1693 $$ = declare_abstract_type($3); 1694 } 1695 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1696 $$ = declare_abstract_type($3); 1697 } 1698 ; 1699 1700 abstract_decl_param_list: /* specific to lint */ 1701 abstract_decl_lparen T_RPAREN type_attribute_opt { 1702 $$ = (parameter_list){ .first = NULL }; 1703 } 1704 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1705 type_attribute_opt { 1706 $$ = $2; 1707 $$.prototype = true; 1708 } 1709 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1710 $$ = (parameter_list){ .first = NULL }; 1711 } 1712 ; 1713 1714 abstract_decl_lparen: /* specific to lint */ 1715 T_LPAREN { 1716 block_level++; 1717 begin_declaration_level(DLK_PROTO_PARAMS); 1718 } 1719 ; 1720 1721 vararg_parameter_type_list: /* specific to lint */ 1722 parameter_type_list 1723 | parameter_type_list T_COMMA T_ELLIPSIS { 1724 $$ = $1; 1725 $$.vararg = true; 1726 } 1727 | T_ELLIPSIS { 1728 /* TODO: C99 6.7.5 makes this an error as well. */ 1729 if (!allow_trad && !allow_c99) 1730 /* C90 to C17 require formal parameter before '...' */ 1731 error(84); 1732 else if (allow_c90) 1733 /* C90 to C17 require formal parameter before '...' */ 1734 warning(84); 1735 $$ = (parameter_list){ .vararg = true }; 1736 } 1737 ; 1738 1739 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1740 parameter_type_list: 1741 parameter_declaration { 1742 $$ = (parameter_list){ .first = $1 }; 1743 } 1744 | parameter_type_list T_COMMA parameter_declaration { 1745 $$ = $1; 1746 $$.first = concat_symbols($1.first, $3); 1747 } 1748 ; 1749 1750 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7, C23 6.7.8 */ 1751 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1752 abstract_declarator: 1753 pointer { 1754 $$ = add_pointer(abstract_name(), $1); 1755 } 1756 | direct_abstract_declarator 1757 | pointer direct_abstract_declarator { 1758 $$ = add_pointer($2, $1); 1759 } 1760 | type_attribute_list direct_abstract_declarator { 1761 $$ = $2; 1762 } 1763 | pointer type_attribute_list direct_abstract_declarator { 1764 $$ = add_pointer($3, $1); 1765 } 1766 ; 1767 1768 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7, C23 6.7.8 */ 1769 direct_abstract_declarator: 1770 /* TODO: sort rules according to C99 */ 1771 T_LPAREN abstract_declarator T_RPAREN { 1772 $$ = $2; 1773 } 1774 | T_LBRACK array_size_opt T_RBRACK { 1775 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1776 } 1777 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1778 $$ = add_array($1, $3.has_dim, $3.dim); 1779 } 1780 | abstract_decl_param_list asm_or_symbolrename_opt { 1781 sym_t *name = abstract_enclosing_name(); 1782 $$ = add_function(symbolrename(name, $2), $1); 1783 end_declaration_level(); 1784 block_level--; 1785 } 1786 | direct_abstract_declarator abstract_decl_param_list 1787 asm_or_symbolrename_opt { 1788 $$ = add_function(symbolrename($1, $3), $2); 1789 end_declaration_level(); 1790 block_level--; 1791 } 1792 | direct_abstract_declarator type_attribute_list 1793 ; 1794 1795 /* TODO: Implement 'array_abstract_declarator' from C23 6.7.8. */ 1796 1797 /* TODO: Implement 'function_abstract_declarator' from C23 6.7.8. */ 1798 1799 /* TODO: Implement 'typedef_name' from C23 6.7.9. */ 1800 1801 /* C23 6.7.11 */ 1802 /* K&R ---, C90 ---, C99 6.7.8, C11 6.7.9, C23 6.7.10 */ 1803 braced_initializer: 1804 init_lbrace init_rbrace { 1805 /* empty initializer braces require C23 or later */ 1806 c23ism(353); 1807 } 1808 | init_lbrace initializer_list init_rbrace 1809 | init_lbrace initializer_list T_COMMA init_rbrace 1810 ; 1811 1812 /* C99 6.7.8, C23 6.7.11 */ 1813 initializer: 1814 assignment_expression { 1815 init_expr($1); 1816 } 1817 | init_lbrace init_rbrace { 1818 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1819 } 1820 | init_lbrace initializer_list init_rbrace 1821 | init_lbrace initializer_list T_COMMA init_rbrace 1822 /* XXX: What is this error handling for? */ 1823 | error 1824 ; 1825 1826 /* C99 6.7.8, C23 6.7.11 */ 1827 initializer_list: 1828 initializer 1829 | designation initializer 1830 | initializer_list T_COMMA initializer 1831 | initializer_list T_COMMA designation initializer 1832 ; 1833 1834 /* C99 6.7.8, C23 6.7.11 */ 1835 designation: 1836 { 1837 begin_designation(); 1838 } designator_list T_ASSIGN 1839 | identifier T_COLON { 1840 /* GCC style struct or union member name in initializer */ 1841 gnuism(315); 1842 begin_designation(); 1843 add_designator_member($1); 1844 } 1845 ; 1846 1847 /* C99 6.7.8, C23 6.7.11 */ 1848 designator_list: 1849 designator 1850 | designator_list designator 1851 ; 1852 1853 /* C99 6.7.8, C23 6.7.11 */ 1854 designator: 1855 T_LBRACK range T_RBRACK { 1856 if (!allow_c99) 1857 /* array initializer with designators is a C99 ... */ 1858 warning(321); 1859 add_designator_subscript($2); 1860 } 1861 | T_POINT identifier { 1862 if (!allow_c99) 1863 /* struct or union member name in initializer is ... */ 1864 warning(313); 1865 add_designator_member($2); 1866 } 1867 ; 1868 1869 /* C23 6.7.12 */ 1870 static_assert_declaration: 1871 T_STATIC_ASSERT T_LPAREN constant_expression T_COMMA T_STRING 1872 T_RPAREN T_SEMI { 1873 /* '_Static_assert' requires C11 or later */ 1874 c11ism(354); 1875 } 1876 | T_STATIC_ASSERT T_LPAREN constant_expression T_RPAREN T_SEMI { 1877 /* '_Static_assert' without message requires C23 or later */ 1878 c23ism(355); 1879 } 1880 ; 1881 1882 range: 1883 constant_expression { 1884 $$.lo = to_int_constant($1, true); 1885 $$.hi = $$.lo; 1886 } 1887 | constant_expression T_ELLIPSIS constant_expression { 1888 $$.lo = to_int_constant($1, true); 1889 $$.hi = to_int_constant($3, true); 1890 /* initialization with '[a...b]' is a GCC extension */ 1891 gnuism(340); 1892 } 1893 ; 1894 1895 init_lbrace: /* helper */ 1896 T_LBRACE { 1897 init_lbrace(); 1898 } 1899 ; 1900 1901 init_rbrace: /* helper */ 1902 T_RBRACE { 1903 init_rbrace(); 1904 } 1905 ; 1906 1907 /* C23 6.7.13.2 */ 1908 attribute_specifier_sequence: 1909 attribute_specifier { 1910 $$ = (attribute_list) { NULL, 0, 0 }; 1911 attribute_list_add_all(&$$, $1); 1912 } 1913 | attribute_specifier_sequence attribute_specifier { 1914 $$ = $1; 1915 attribute_list_add_all(&$$, $2); 1916 } 1917 ; 1918 1919 /* C23 6.7.13.2 */ 1920 attribute_specifier: 1921 T_LBRACK T_LBRACK attribute_list T_RBRACK T_RBRACK { 1922 $$ = $3; 1923 } 1924 ; 1925 1926 /* C23 6.7.13.2 */ 1927 attribute_list: 1928 /* empty */ { 1929 $$ = (attribute_list) { NULL, 0, 0 }; 1930 } 1931 | attribute { 1932 $$ = (attribute_list) { NULL, 0, 0 }; 1933 attribute_list_add(&$$, $1); 1934 } 1935 | attribute_list T_COMMA 1936 | attribute_list T_COMMA attribute { 1937 $$ = $1; 1938 attribute_list_add(&$$, $3); 1939 } 1940 ; 1941 1942 /* C23 6.7.13.2 */ 1943 attribute: 1944 identifier { 1945 $$ = new_attribute(NULL, $1, NULL); 1946 } 1947 | identifier T_DCOLON identifier { 1948 $$ = new_attribute($1, $3, NULL); 1949 } 1950 | identifier attribute_argument_clause { 1951 $$ = new_attribute(NULL, $1, &$2); 1952 } 1953 | identifier T_DCOLON identifier attribute_argument_clause { 1954 $$ = new_attribute($1, $3, &$4); 1955 } 1956 ; 1957 1958 /* The rule 'attribute_token' is inlined into 'attribute'. */ 1959 /* The rule 'standard_attribute' is inlined into 'attribute_token'. */ 1960 /* The rule 'attribute_prefixed_token' is inlined into 'attribute_token'. */ 1961 /* The rule 'attribute_prefix' is inlined into 'attribute_token'. */ 1962 1963 /* C23 6.7.13.2 */ 1964 attribute_argument_clause: 1965 T_LPAREN { 1966 $$ = read_balanced_token_sequence(); 1967 } 1968 ; 1969 1970 /* The rule 'balanced_token_sequence' is inlined into 'attribute_argument_clause'. */ 1971 /* The rule 'balanced_token' is inlined into 'balanced_token_sequence'. */ 1972 1973 asm_or_symbolrename_opt: /* GCC extensions */ 1974 /* empty */ { 1975 $$ = NULL; 1976 } 1977 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1978 freeyyv(&$3, T_STRING); 1979 $$ = NULL; 1980 } 1981 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1982 gcc_attribute_specifier_list_opt { 1983 $$ = $3; 1984 } 1985 ; 1986 1987 /* K&R ???, C90 ???, C99 6.8, C11 ???, C23 6.8.1 */ 1988 statement: 1989 expression_statement 1990 | non_expr_statement 1991 ; 1992 1993 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 1994 no_attr_statement: 1995 expression_statement 1996 | no_attr_non_expr_statement 1997 ; 1998 1999 non_expr_statement: /* helper for C99 6.8 */ 2000 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 2001 | no_attr_non_expr_statement 2002 ; 2003 2004 /* Helper to avoid shift/reduce conflict in 'label: __attribute__ ;'. */ 2005 no_attr_non_expr_statement: 2006 labeled_statement 2007 | compound_statement 2008 | selection_statement 2009 | iteration_statement 2010 | jump_statement { 2011 suppress_fallthrough = false; 2012 } 2013 | asm_statement 2014 ; 2015 2016 /* TODO: Implement 'unlabeled_statement' from C23 6.8.1. */ 2017 2018 /* TODO: Implement 'primary_block' from C23 6.8.1. */ 2019 2020 /* TODO: Implement 'secondary_block' from C23 6.8.1. */ 2021 2022 /* C23 6.8.2 */ 2023 label: 2024 T_NAME T_COLON { 2025 set_sym_kind(SK_LABEL); 2026 named_label(getsym($1)); 2027 } 2028 | T_CASE constant_expression T_COLON { 2029 case_label($2); 2030 suppress_fallthrough = true; 2031 } 2032 | T_CASE constant_expression T_ELLIPSIS constant_expression T_COLON { 2033 /* XXX: We don't fill all cases */ 2034 case_label($2); 2035 suppress_fallthrough = true; 2036 } 2037 | T_DEFAULT T_COLON { 2038 default_label(); 2039 suppress_fallthrough = true; 2040 } 2041 ; 2042 2043 /* C99 6.8.1, C23 6.8.2 */ 2044 labeled_statement: 2045 label gcc_attribute_specifier_list_opt no_attr_statement 2046 ; 2047 2048 /* C99 6.8.2, C23 6.8.3 */ 2049 compound_statement: 2050 compound_statement_lbrace compound_statement_rbrace 2051 | compound_statement_lbrace block_item_list compound_statement_rbrace 2052 ; 2053 2054 compound_statement_lbrace: 2055 T_LBRACE { 2056 block_level++; 2057 mem_block_level++; 2058 debug_step("%s: mem_block_level = %zu", 2059 "compound_statement_lbrace", mem_block_level); 2060 begin_declaration_level(DLK_AUTO); 2061 } 2062 ; 2063 2064 compound_statement_rbrace: 2065 T_RBRACE { 2066 end_declaration_level(); 2067 if (!in_statement_expr()) 2068 level_free_all(mem_block_level); /* leak */ 2069 mem_block_level--; 2070 debug_step("%s: mem_block_level = %zu", 2071 "compound_statement_rbrace", mem_block_level); 2072 block_level--; 2073 suppress_fallthrough = false; 2074 } 2075 ; 2076 2077 /* C99 6.8.2, C23 6.8.3 */ 2078 block_item_list: 2079 block_item 2080 | block_item_list block_item { 2081 if ($1 && !$2) 2082 /* declarations after statements is a C99 feature */ 2083 c99ism(327); 2084 $$ = $1 || $2; 2085 } 2086 ; 2087 2088 /* C99 6.8.2, C23 6.8.3 */ 2089 block_item: 2090 declaration_or_error { 2091 $$ = false; 2092 restore_warning_flags(); 2093 } 2094 | statement { 2095 $$ = true; 2096 restore_warning_flags(); 2097 } 2098 ; 2099 2100 /* C99 6.8.3, C23 6.8.4 */ 2101 expression_statement: 2102 expression T_SEMI { 2103 expr($1, false, false, false, false); 2104 suppress_fallthrough = false; 2105 } 2106 | T_SEMI { 2107 check_statement_reachable(); 2108 suppress_fallthrough = false; 2109 } 2110 | attribute_specifier_sequence expression T_SEMI { 2111 debug_attribute_list(&$1); 2112 expr($2, false, false, false, false); 2113 suppress_fallthrough = false; 2114 } 2115 ; 2116 2117 /* C99 6.8.4, C23 6.8.5.1 */ 2118 selection_statement: 2119 if_without_else %prec T_THEN { 2120 save_warning_flags(); 2121 stmt_if_then_stmt(); 2122 stmt_if_else_stmt(false); 2123 } 2124 | if_without_else T_ELSE { 2125 save_warning_flags(); 2126 stmt_if_then_stmt(); 2127 } statement { 2128 clear_warning_flags(); 2129 stmt_if_else_stmt(true); 2130 } 2131 | if_without_else T_ELSE error { 2132 clear_warning_flags(); 2133 stmt_if_else_stmt(false); 2134 } 2135 | switch_expr statement { 2136 clear_warning_flags(); 2137 stmt_switch_expr_stmt(); 2138 } 2139 | switch_expr error { 2140 clear_warning_flags(); 2141 stmt_switch_expr_stmt(); 2142 } 2143 ; 2144 2145 if_without_else: /* see C99 6.8.4 */ 2146 if_expr statement 2147 | if_expr error 2148 ; 2149 2150 if_expr: /* see C99 6.8.4 */ 2151 T_IF T_LPAREN expression T_RPAREN { 2152 stmt_if_expr($3); 2153 clear_warning_flags(); 2154 } 2155 ; 2156 2157 switch_expr: /* see C99 6.8.4 */ 2158 T_SWITCH T_LPAREN expression T_RPAREN { 2159 stmt_switch_expr($3); 2160 clear_warning_flags(); 2161 } 2162 ; 2163 2164 /* C99 6.8.5, C23 6.8.6.1 */ 2165 iteration_statement: 2166 while_expr statement { 2167 clear_warning_flags(); 2168 stmt_while_expr_stmt(); 2169 } 2170 | while_expr error { 2171 clear_warning_flags(); 2172 stmt_while_expr_stmt(); 2173 } 2174 | do_statement T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 2175 stmt_do_while_expr($4); 2176 suppress_fallthrough = false; 2177 } 2178 | do error { 2179 clear_warning_flags(); 2180 stmt_do_while_expr(NULL); 2181 } 2182 | for_exprs statement { 2183 clear_warning_flags(); 2184 stmt_for_exprs_stmt(); 2185 end_declaration_level(); 2186 block_level--; 2187 } 2188 | for_exprs error { 2189 clear_warning_flags(); 2190 stmt_for_exprs_stmt(); 2191 end_declaration_level(); 2192 block_level--; 2193 } 2194 ; 2195 2196 while_expr: /* see C99 6.8.5 */ 2197 T_WHILE T_LPAREN expression T_RPAREN { 2198 stmt_while_expr($3); 2199 clear_warning_flags(); 2200 } 2201 ; 2202 2203 do_statement: /* see C99 6.8.5 */ 2204 do statement { 2205 clear_warning_flags(); 2206 } 2207 ; 2208 2209 do: /* see C99 6.8.5 */ 2210 T_DO { 2211 stmt_do(); 2212 } 2213 ; 2214 2215 for_start: /* see C99 6.8.5 */ 2216 T_FOR T_LPAREN { 2217 begin_declaration_level(DLK_AUTO); 2218 block_level++; 2219 } 2220 ; 2221 2222 for_exprs: /* see C99 6.8.5 */ 2223 for_start 2224 begin_type_declaration_specifiers end_type 2225 notype_init_declarator_list T_SEMI 2226 expression_opt T_SEMI 2227 expression_opt T_RPAREN { 2228 /* variable declaration in for loop */ 2229 c99ism(325); 2230 stmt_for_exprs(NULL, $6, $8); 2231 clear_warning_flags(); 2232 } 2233 | for_start 2234 expression_opt T_SEMI 2235 expression_opt T_SEMI 2236 expression_opt T_RPAREN { 2237 stmt_for_exprs($2, $4, $6); 2238 clear_warning_flags(); 2239 } 2240 ; 2241 2242 /* C99 6.8.6, C23 6.8.7.1 */ 2243 jump_statement: 2244 goto identifier T_SEMI { 2245 stmt_goto(getsym($2)); 2246 } 2247 | goto error T_SEMI { 2248 set_sym_kind(SK_VCFT); 2249 } 2250 | T_CONTINUE T_SEMI { 2251 stmt_continue(); 2252 } 2253 | T_BREAK T_SEMI { 2254 stmt_break(); 2255 } 2256 | T_RETURN sys T_SEMI { 2257 stmt_return($2, NULL); 2258 } 2259 | T_RETURN sys expression T_SEMI { 2260 stmt_return($2, $3); 2261 } 2262 ; 2263 2264 goto: /* see C99 6.8.6 */ 2265 T_GOTO { 2266 set_sym_kind(SK_LABEL); 2267 } 2268 ; 2269 2270 asm_statement: /* GCC extension */ 2271 T_ASM T_LPAREN read_until_rparen T_SEMI { 2272 dcs_set_asm(); 2273 } 2274 | T_ASM type_qualifier T_LPAREN read_until_rparen T_SEMI { 2275 dcs_set_asm(); 2276 } 2277 | T_ASM error 2278 ; 2279 2280 read_until_rparen: /* helper for 'asm_statement' */ 2281 /* empty */ { 2282 read_until_rparen(); 2283 } 2284 ; 2285 2286 /* C99 6.9, C23 6.9.1 */ 2287 translation_unit: 2288 external_declaration 2289 | translation_unit external_declaration 2290 ; 2291 2292 /* C99 6.9, C23 6.9.1 */ 2293 external_declaration: 2294 function_definition { 2295 global_clean_up_decl(false); 2296 clear_warning_flags(); 2297 } 2298 | top_level_declaration { 2299 global_clean_up_decl(false); 2300 clear_warning_flags(); 2301 } 2302 | asm_statement /* GCC extension */ 2303 | T_SEMI { /* GCC extension */ 2304 /* 2305 * TODO: Only allow this in GCC mode, not in plain C99. 2306 * This is one of the top 10 warnings in the NetBSD build. 2307 */ 2308 if (!allow_trad && !allow_c99) 2309 /* empty declaration */ 2310 error(0); 2311 else if (allow_c90) 2312 /* empty declaration */ 2313 warning(0); 2314 } 2315 ; 2316 2317 /* 2318 * On the top level, lint allows several forms of declarations that it doesn't 2319 * allow in functions. For example, a single ';' is an empty declaration and 2320 * is supported by some compilers, but in a function it would be an empty 2321 * statement, not a declaration. This makes a difference in C90 mode, where 2322 * a statement must not be followed by a declaration. 2323 * 2324 * See 'declaration' for all other declarations. 2325 */ 2326 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 2327 begin_type end_type notype_init_declarator_list T_SEMI { 2328 /* TODO: Make this an error in C99 mode as well. */ 2329 if (!allow_trad && !allow_c99) 2330 /* old-style declaration; add 'int' */ 2331 error(1); 2332 else if (allow_c90) 2333 /* old-style declaration; add 'int' */ 2334 warning(1); 2335 } 2336 | declaration 2337 | error T_SEMI { 2338 global_clean_up(); 2339 } 2340 | error T_RBRACE { 2341 global_clean_up(); 2342 } 2343 ; 2344 2345 /* C99 6.9.1, C23 6.9.2 */ 2346 function_definition: 2347 func_declarator { 2348 if ($1->s_type->t_tspec != FUNC) { 2349 /* syntax error '%s' */ 2350 error(249, yytext); 2351 YYERROR; 2352 } 2353 if ($1->s_type->t_typedef) { 2354 /* ()-less function definition */ 2355 error(64); 2356 YYERROR; 2357 } 2358 check_extern_declaration($1); 2359 begin_function($1); 2360 block_level++; 2361 begin_declaration_level(DLK_OLD_STYLE_PARAMS); 2362 if (lwarn == LWARN_NONE) 2363 $1->s_used = true; 2364 } arg_declaration_list_opt { 2365 end_declaration_level(); 2366 block_level--; 2367 check_func_lint_directives(); 2368 check_func_old_style_parameters(); 2369 begin_control_statement(CS_FUNCTION_BODY); 2370 } compound_statement { 2371 end_function(); 2372 end_control_statement(CS_FUNCTION_BODY); 2373 } 2374 ; 2375 2376 func_declarator: 2377 begin_type end_type notype_declarator { 2378 if (!allow_trad) 2379 /* old-style declaration; add 'int' */ 2380 error(1); 2381 $$ = $3; 2382 } 2383 | begin_type_declmods end_type notype_declarator { 2384 if (!allow_trad) 2385 /* old-style declaration; add 'int' */ 2386 error(1); 2387 $$ = $3; 2388 } 2389 | begin_type_declaration_specifiers end_type type_declarator { 2390 $$ = $3; 2391 } 2392 ; 2393 2394 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 2395 /* empty */ 2396 | arg_declaration_list 2397 ; 2398 2399 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 2400 arg_declaration 2401 | arg_declaration_list arg_declaration 2402 /* XXX or better "arg_declaration error" ? */ 2403 | error 2404 ; 2405 2406 /* 2407 * "arg_declaration" is separated from "declaration" because it 2408 * needs other error handling. 2409 */ 2410 arg_declaration: 2411 begin_type_declmods end_type T_SEMI { 2412 /* empty declaration */ 2413 warning(2); 2414 } 2415 | begin_type_declmods end_type notype_init_declarator_list T_SEMI 2416 | begin_type_declaration_specifiers end_type T_SEMI { 2417 if (!dcs->d_nonempty_decl) 2418 /* empty declaration */ 2419 warning(2); 2420 else 2421 /* '%s' declared in parameter declaration list */ 2422 warning(3, type_name(dcs->d_type)); 2423 } 2424 | begin_type_declaration_specifiers end_type 2425 type_init_declarator_list T_SEMI { 2426 if (dcs->d_nonempty_decl) 2427 /* '%s' declared in parameter declaration list */ 2428 warning(3, type_name(dcs->d_type)); 2429 } 2430 | begin_type_declmods error 2431 | begin_type_declaration_specifiers error 2432 ; 2433 2434 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2435 gcc_attribute_specifier_list_opt: 2436 /* empty */ 2437 | gcc_attribute_specifier_list 2438 ; 2439 2440 gcc_attribute_specifier_list: 2441 gcc_attribute_specifier 2442 | gcc_attribute_specifier_list gcc_attribute_specifier 2443 ; 2444 2445 gcc_attribute_specifier: 2446 T_ATTRIBUTE T_LPAREN T_LPAREN { 2447 in_gcc_attribute = true; 2448 } gcc_attribute_list { 2449 in_gcc_attribute = false; 2450 } T_RPAREN T_RPAREN 2451 ; 2452 2453 gcc_attribute_list: 2454 gcc_attribute 2455 | gcc_attribute_list T_COMMA gcc_attribute 2456 ; 2457 2458 gcc_attribute: 2459 /* empty */ 2460 | T_NAME { 2461 const char *name = $1->sb_name; 2462 if (is_either(name, "packed", "__packed__")) 2463 dcs_add_packed(); 2464 else if (is_either(name, "used", "__used__") || 2465 is_either(name, "unused", "__unused__")) 2466 dcs_set_used(); 2467 else if (is_either(name, "fallthrough", "__fallthrough__")) 2468 suppress_fallthrough = true; 2469 } 2470 | T_NAME T_LPAREN T_RPAREN 2471 | T_NAME T_LPAREN argument_expression_list T_RPAREN { 2472 const char *name = $1->sb_name; 2473 if (is_either(name, "aligned", "__aligned__") 2474 && $3->args_len == 1) 2475 dcs_add_alignas($3->args[0]); 2476 } 2477 | type_qualifier { 2478 if (!$1.tq_const) 2479 yyerror("Bad attribute"); 2480 } 2481 ; 2482 2483 /* The rule 'function_body' from C23 6.9.2 is inlined into 'function_definition'. */ 2484 2485 sys: 2486 /* empty */ { 2487 $$ = in_system_header; 2488 } 2489 ; 2490 2491 %% 2492 2493 /* ARGSUSED */ 2494 int 2495 yyerror(const char *msg) 2496 { 2497 /* syntax error '%s' */ 2498 error(249, yytext); 2499 if (++sytxerr >= 5) 2500 norecover(); 2501 return 0; 2502 } 2503 2504 #if YYDEBUG && YYBYACC 2505 static const char * 2506 cgram_to_string(int tok, YYSTYPE val) 2507 { 2508 2509 switch (tok) { 2510 case T_INCDEC: 2511 return val.y_inc ? "++" : "--"; 2512 case T_MULTIPLICATIVE: 2513 case T_ADDITIVE: 2514 case T_SHIFT: 2515 case T_RELATIONAL: 2516 case T_EQUALITY: 2517 case T_OPASSIGN: 2518 return op_name(val.y_op); 2519 case T_SCLASS: 2520 return scl_name(val.y_scl); 2521 case T_TYPE: 2522 case T_STRUCT_OR_UNION: 2523 return tspec_name(val.y_tspec); 2524 case T_QUAL: 2525 return type_qualifiers_string(val.y_type_qualifiers); 2526 case T_FUNCTION_SPECIFIER: 2527 return function_specifier_name(val.y_function_specifier); 2528 case T_NAME: 2529 return val.y_name->sb_name; 2530 default: 2531 return "<none>"; 2532 } 2533 } 2534 #endif 2535 2536 static void 2537 cgram_declare(sym_t *decl, bool has_initializer, sbuf_t *renaming) 2538 { 2539 declare(decl, has_initializer, renaming); 2540 if (renaming != NULL) 2541 freeyyv(&renaming, T_NAME); 2542 } 2543 2544 /* 2545 * Discard all input tokens up to and including the next unmatched right 2546 * parenthesis. 2547 */ 2548 static void 2549 read_until_rparen(void) 2550 { 2551 int level; 2552 2553 if (yychar < 0) 2554 yychar = yylex(); 2555 freeyyv(&yylval, yychar); 2556 2557 level = 1; 2558 while (yychar > 0) { 2559 if (yychar == T_LPAREN) 2560 level++; 2561 if (yychar == T_RPAREN && --level == 0) 2562 break; 2563 freeyyv(&yylval, yychar = yylex()); 2564 } 2565 2566 yyclearin; 2567 } 2568 2569 static balanced_token_sequence 2570 read_balanced_token_sequence(void) 2571 { 2572 lint_assert(yychar < 0); 2573 balanced_token_sequence seq = lex_balanced(); 2574 yyclearin; 2575 return seq; 2576 } 2577 2578 static sym_t * 2579 symbolrename(sym_t *s, sbuf_t *sb) 2580 { 2581 if (sb != NULL) 2582 s->s_rename = sb->sb_name; 2583 return s; 2584 } 2585
Indexes created Thu Oct 02 14:10:14 GMT 2025