cgram.y revision 1.428
1 %{ 2 /* $NetBSD: cgram.y,v 1.428 2023/01/21 12:45:27 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 1.428 2023/01/21 12:45:27 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 arguments in prototypes. Memory 58 * for these can't be freed after the declaration, but symbols must 59 * be removed from the symbol table after the declaration. 60 */ 61 size_t mem_block_level; 62 63 /* 64 * Save the no-warns state and restore it to avoid the problem where 65 * if (expr) { stmt } / * NOLINT * / stmt; 66 */ 67 #define LWARN_NOTHING_SAVED (-3) 68 static int saved_lwarn = LWARN_NOTHING_SAVED; 69 70 static void cgram_declare(sym_t *, bool, sbuf_t *); 71 static void read_until_rparen(void); 72 static sym_t *symbolrename(sym_t *, sbuf_t *); 73 74 75 /* ARGSUSED */ 76 static void 77 clear_warning_flags_loc(const char *file, size_t line) 78 { 79 debug_step("%s:%zu: clearing flags", file, line); 80 clear_warn_flags(); 81 saved_lwarn = LWARN_NOTHING_SAVED; 82 } 83 84 /* ARGSUSED */ 85 static void 86 save_warning_flags_loc(const char *file, size_t line) 87 { 88 /* 89 * There used to be an assertion that saved_lwarn is 90 * LWARN_NOTHING_SAVED here, but that triggered for the following 91 * code: 92 * 93 * void function(int x) { if (x > 0) if (x > 1) return; } 94 * 95 * It didn't trigger if the inner 'if' was enclosed in braces though. 96 * 97 * TODO: If actually needed, add support for nested suppression of 98 * warnings. 99 */ 100 debug_step("%s:%zu: saving flags %d", file, line, lwarn); 101 saved_lwarn = lwarn; 102 } 103 104 /* ARGSUSED */ 105 static void 106 restore_warning_flags_loc(const char *file, size_t line) 107 { 108 if (saved_lwarn != LWARN_NOTHING_SAVED) { 109 lwarn = saved_lwarn; 110 debug_step("%s:%zu: restoring flags %d", file, line, lwarn); 111 /* 112 * Do not set 'saved_lwarn = LWARN_NOTHING_SAVED' here, to 113 * avoid triggering the assertion in save_warning_flags_loc. 114 */ 115 } else 116 clear_warning_flags_loc(file, line); 117 } 118 119 #define clear_warning_flags() clear_warning_flags_loc(__FILE__, __LINE__) 120 #define save_warning_flags() save_warning_flags_loc(__FILE__, __LINE__) 121 #define restore_warning_flags() restore_warning_flags_loc(__FILE__, __LINE__) 122 123 /* unbind the anonymous struct members from the struct */ 124 static void 125 anonymize(sym_t *s) 126 { 127 for ( ; s != NULL; s = s->s_next) 128 s->u.s_member.sm_sou_type = NULL; 129 } 130 131 static bool 132 is_either(const char *s, const char *a, const char *b) 133 { 134 return strcmp(s, a) == 0 || strcmp(s, b) == 0; 135 } 136 137 #if YYDEBUG && (YYBYACC || YYBISON) 138 #define YYSTYPE_TOSTRING cgram_to_string 139 #endif 140 #if YYDEBUG && YYBISON 141 #define YYPRINT cgram_print 142 #endif 143 144 %} 145 146 %expect 129 147 148 %union { 149 val_t *y_val; 150 sbuf_t *y_name; 151 sym_t *y_sym; 152 op_t y_op; 153 scl_t y_scl; 154 tspec_t y_tspec; 155 tqual_t y_tqual; 156 type_t *y_type; 157 tnode_t *y_tnode; 158 range_t y_range; 159 strg_t *y_string; 160 qual_ptr *y_qual_ptr; 161 bool y_seen_statement; 162 struct generic_association *y_generic; 163 struct array_size y_array_size; 164 bool y_in_system_header; 165 }; 166 167 %token T_LBRACE T_RBRACE T_LBRACK T_RBRACK T_LPAREN T_RPAREN 168 %token T_POINT T_ARROW 169 %token T_COMPLEMENT T_LOGNOT 170 %token <y_op> T_INCDEC 171 %token T_SIZEOF 172 %token T_BUILTIN_OFFSETOF 173 %token T_TYPEOF 174 %token T_EXTENSION 175 %token T_ALIGNAS 176 %token T_ALIGNOF 177 %token T_ASTERISK 178 %token <y_op> T_MULTIPLICATIVE 179 %token <y_op> T_ADDITIVE 180 %token <y_op> T_SHIFT 181 %token <y_op> T_RELATIONAL 182 %token <y_op> T_EQUALITY 183 %token T_AMPER 184 %token T_BITXOR 185 %token T_BITOR 186 %token T_LOGAND 187 %token T_LOGOR 188 %token T_QUEST 189 %token T_COLON 190 %token T_ASSIGN 191 %token <y_op> T_OPASSIGN 192 %token T_COMMA 193 %token T_SEMI 194 %token T_ELLIPSIS 195 %token T_REAL 196 %token T_IMAG 197 %token T_GENERIC 198 %token T_NORETURN 199 200 /* storage classes (extern, static, auto, register and typedef) */ 201 %token <y_scl> T_SCLASS 202 203 /* 204 * predefined type keywords (char, int, short, long, unsigned, signed, 205 * float, double, void); see T_TYPENAME for types from typedef 206 */ 207 %token <y_tspec> T_TYPE 208 209 /* qualifiers (const, volatile, restrict, _Thread_local) */ 210 %token <y_tqual> T_QUAL 211 212 /* struct or union */ 213 %token <y_tspec> T_STRUCT_OR_UNION 214 215 /* remaining keywords */ 216 %token T_ASM 217 %token T_BREAK 218 %token T_CASE 219 %token T_CONTINUE 220 %token T_DEFAULT 221 %token T_DO 222 %token T_ELSE 223 %token T_ENUM 224 %token T_FOR 225 %token T_GOTO 226 %token T_IF 227 %token T_PACKED 228 %token T_RETURN 229 %token T_SWITCH 230 %token T_SYMBOLRENAME 231 %token T_WHILE 232 %token T_STATIC_ASSERT 233 234 %token T_ATTRIBUTE 235 236 %left T_THEN 237 %left T_ELSE 238 %right T_QUEST T_COLON 239 %left T_LOGOR 240 %left T_LOGAND 241 %left T_BITOR 242 %left T_BITXOR 243 %left T_AMPER 244 %left T_EQUALITY 245 %left T_RELATIONAL 246 %left T_SHIFT 247 %left T_ADDITIVE 248 %left T_ASTERISK T_MULTIPLICATIVE 249 250 %token <y_name> T_NAME 251 %token <y_name> T_TYPENAME 252 %token <y_val> T_CON 253 %token <y_string> T_STRING 254 255 %type <y_sym> identifier_sym 256 %type <y_name> identifier 257 %type <y_string> string 258 259 %type <y_tnode> primary_expression 260 %type <y_tnode> generic_selection 261 %type <y_generic> generic_assoc_list 262 %type <y_generic> generic_association 263 %type <y_tnode> postfix_expression 264 %type <y_tnode> gcc_statement_expr_list 265 %type <y_tnode> gcc_statement_expr_item 266 %type <y_op> point_or_arrow 267 %type <y_tnode> argument_expression_list 268 %type <y_tnode> unary_expression 269 %type <y_tnode> cast_expression 270 %type <y_tnode> conditional_expression 271 %type <y_tnode> assignment_expression 272 %type <y_tnode> expression_opt 273 %type <y_tnode> expression 274 %type <y_tnode> constant_expr 275 276 %type <y_type> begin_type_typespec 277 %type <y_type> type_specifier 278 %type <y_type> notype_type_specifier 279 %type <y_type> struct_or_union_specifier 280 %type <y_tspec> struct_or_union 281 %type <y_sym> braced_struct_declaration_list 282 %type <y_sym> struct_declaration_list_with_rbrace 283 %type <y_sym> struct_declaration_list 284 %type <y_sym> struct_declaration 285 %type <y_sym> notype_struct_declarators 286 %type <y_sym> type_struct_declarators 287 %type <y_sym> notype_struct_declarator 288 %type <y_sym> type_struct_declarator 289 %type <y_type> enum_specifier 290 %type <y_sym> enum_declaration 291 %type <y_sym> enums_with_opt_comma 292 %type <y_sym> enumerator_list 293 %type <y_sym> enumerator 294 %type <y_tqual> type_qualifier 295 %type <y_qual_ptr> pointer 296 %type <y_qual_ptr> asterisk 297 %type <y_qual_ptr> type_qualifier_list_opt 298 %type <y_qual_ptr> type_qualifier_list 299 %type <y_qual_ptr> type_qualifier_list_elem 300 %type <y_sym> notype_declarator 301 %type <y_sym> type_declarator 302 %type <y_sym> notype_direct_declarator 303 %type <y_sym> type_direct_declarator 304 %type <y_sym> type_param_declarator 305 %type <y_sym> notype_param_declarator 306 %type <y_sym> direct_param_declarator 307 %type <y_sym> direct_notype_param_declarator 308 %type <y_sym> param_list 309 %type <y_array_size> array_size_opt 310 %type <y_tnode> array_size 311 %type <y_sym> identifier_list 312 %type <y_type> type_name 313 %type <y_sym> abstract_declaration 314 %type <y_sym> abstract_declarator 315 %type <y_sym> direct_abstract_declarator 316 %type <y_sym> abstract_decl_param_list 317 %type <y_sym> vararg_parameter_type_list 318 %type <y_sym> parameter_type_list 319 %type <y_sym> parameter_declaration 320 %type <y_range> range 321 %type <y_name> asm_or_symbolrename_opt 322 323 %type <y_seen_statement> block_item_list 324 %type <y_seen_statement> block_item 325 %type <y_tnode> do_while_expr 326 %type <y_sym> func_declarator 327 %type <y_in_system_header> sys 328 329 %{ 330 #if YYDEBUG && YYBISON 331 static inline void cgram_print(FILE *, int, YYSTYPE); 332 #endif 333 %} 334 335 %% 336 337 program: 338 /* empty */ { 339 /* TODO: Make this an error in C99 mode as well. */ 340 if (!allow_trad && !allow_c99) { 341 /* empty translation unit */ 342 error(272); 343 } else if (allow_c90) { 344 /* empty translation unit */ 345 warning(272); 346 } 347 } 348 | translation_unit 349 ; 350 351 identifier_sym: /* helper for struct/union/enum */ 352 identifier { 353 $$ = getsym($1); 354 } 355 ; 356 357 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 358 identifier: 359 T_NAME { 360 debug_step("cgram: name '%s'", $1->sb_name); 361 $$ = $1; 362 } 363 | T_TYPENAME { 364 debug_step("cgram: typename '%s'", $1->sb_name); 365 $$ = $1; 366 } 367 ; 368 369 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 370 string: 371 T_STRING 372 | string T_STRING { 373 if (!allow_c90) { 374 /* concatenated strings are illegal in traditional C */ 375 warning(219); 376 } 377 $$ = cat_strings($1, $2); 378 } 379 ; 380 381 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 382 primary_expression: 383 T_NAME { 384 bool sys_name, sys_next; 385 sys_name = in_system_header; 386 if (yychar < 0) 387 yychar = yylex(); 388 sys_next = in_system_header; 389 in_system_header = sys_name; 390 $$ = build_name(getsym($1), yychar == T_LPAREN); 391 in_system_header = sys_next; 392 } 393 | T_CON { 394 $$ = build_constant(gettyp($1->v_tspec), $1); 395 } 396 | string { 397 $$ = build_string($1); 398 } 399 | T_LPAREN expression T_RPAREN { 400 if ($2 != NULL) 401 $2->tn_parenthesized = true; 402 $$ = $2; 403 } 404 | generic_selection 405 /* GCC primary-expression, see c_parser_postfix_expression */ 406 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 407 symtyp = FMEMBER; 408 $$ = build_offsetof($3, getsym($5)); 409 } 410 ; 411 412 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 413 generic_selection: 414 T_GENERIC T_LPAREN assignment_expression T_COMMA 415 generic_assoc_list T_RPAREN { 416 /* generic selection requires C11 or later */ 417 c11ism(345); 418 $$ = build_generic_selection($3, $5); 419 } 420 ; 421 422 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 423 generic_assoc_list: 424 generic_association 425 | generic_assoc_list T_COMMA generic_association { 426 $3->ga_prev = $1; 427 $$ = $3; 428 } 429 ; 430 431 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 432 generic_association: 433 type_name T_COLON assignment_expression { 434 $$ = block_zero_alloc(sizeof(*$$)); 435 $$->ga_arg = $1; 436 $$->ga_result = $3; 437 } 438 | T_DEFAULT T_COLON assignment_expression { 439 $$ = block_zero_alloc(sizeof(*$$)); 440 $$->ga_arg = NULL; 441 $$->ga_result = $3; 442 } 443 ; 444 445 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 446 postfix_expression: 447 primary_expression 448 | postfix_expression T_LBRACK sys expression T_RBRACK { 449 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 450 } 451 | postfix_expression T_LPAREN sys T_RPAREN { 452 $$ = build_function_call($1, $3, NULL); 453 } 454 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 455 $$ = build_function_call($1, $3, $4); 456 } 457 | postfix_expression point_or_arrow sys T_NAME { 458 $$ = build_member_access($1, $2, $3, $4); 459 } 460 | postfix_expression T_INCDEC sys { 461 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 462 } 463 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 464 sym_t *tmp = mktempsym($2); 465 begin_initialization(tmp); 466 cgram_declare(tmp, true, NULL); 467 } init_lbrace initializer_list comma_opt init_rbrace { 468 if (!allow_c99) 469 /* compound literals are a C99/GCC extension */ 470 gnuism(319); 471 $$ = build_name(*current_initsym(), false); 472 end_initialization(); 473 } 474 | T_LPAREN compound_statement_lbrace { 475 begin_statement_expr(); 476 } gcc_statement_expr_list { 477 do_statement_expr($4); 478 } compound_statement_rbrace T_RPAREN { 479 $$ = end_statement_expr(); 480 } 481 ; 482 483 comma_opt: /* helper for 'postfix_expression' */ 484 /* empty */ 485 | T_COMMA 486 ; 487 488 /* 489 * The inner part of a GCC statement-expression of the form ({ ... }). 490 * 491 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 492 */ 493 gcc_statement_expr_list: 494 gcc_statement_expr_item 495 | gcc_statement_expr_list gcc_statement_expr_item { 496 $$ = $2; 497 } 498 ; 499 500 gcc_statement_expr_item: 501 declaration_or_error { 502 clear_warning_flags(); 503 $$ = NULL; 504 } 505 | non_expr_statement { 506 $$ = expr_alloc_tnode(); 507 $$->tn_type = gettyp(VOID); 508 } 509 | expression T_SEMI { 510 if ($1 == NULL) { /* in case of syntax errors */ 511 $$ = expr_alloc_tnode(); 512 $$->tn_type = gettyp(VOID); 513 } else { 514 /* XXX: do that only on the last name */ 515 if ($1->tn_op == NAME) 516 $1->tn_sym->s_used = true; 517 expr($1, false, false, false, false); 518 seen_fallthrough = false; 519 $$ = $1; 520 } 521 } 522 ; 523 524 point_or_arrow: /* helper for 'postfix_expression' */ 525 T_POINT { 526 symtyp = FMEMBER; 527 $$ = POINT; 528 } 529 | T_ARROW { 530 symtyp = FMEMBER; 531 $$ = ARROW; 532 } 533 ; 534 535 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 536 argument_expression_list: 537 assignment_expression { 538 $$ = build_function_argument(NULL, $1); 539 } 540 | argument_expression_list T_COMMA assignment_expression { 541 $$ = build_function_argument($1, $3); 542 } 543 ; 544 545 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 546 unary_expression: 547 postfix_expression 548 | T_INCDEC sys unary_expression { 549 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 550 } 551 | T_AMPER sys cast_expression { 552 $$ = build_unary(ADDR, $2, $3); 553 } 554 | T_ASTERISK sys cast_expression { 555 $$ = build_unary(INDIR, $2, $3); 556 } 557 | T_ADDITIVE sys cast_expression { 558 if (!allow_c90 && $1 == PLUS) { 559 /* unary '+' is illegal in traditional C */ 560 warning(100); 561 } 562 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 563 } 564 | T_COMPLEMENT sys cast_expression { 565 $$ = build_unary(COMPL, $2, $3); 566 } 567 | T_LOGNOT sys cast_expression { 568 $$ = build_unary(NOT, $2, $3); 569 } 570 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 571 $$ = build_unary(REAL, $2, $3); 572 } 573 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 574 $$ = build_unary(IMAG, $2, $3); 575 } 576 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 577 $$ = $2; 578 } 579 | T_SIZEOF unary_expression { 580 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 581 if ($$ != NULL) 582 check_expr_misc($2, 583 false, false, false, false, false, true); 584 } 585 | T_SIZEOF T_LPAREN type_name T_RPAREN { 586 $$ = build_sizeof($3); 587 } 588 | T_ALIGNOF unary_expression { 589 /* non type argument to alignof is a GCC extension */ 590 gnuism(349); 591 lint_assert($2 != NULL); 592 $$ = build_alignof($2->tn_type); 593 } 594 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 595 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 596 /* TODO: c11ism */ 597 $$ = build_alignof($3); 598 } 599 ; 600 601 /* The rule 'unary_operator' is inlined into unary_expression. */ 602 603 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 604 cast_expression: 605 unary_expression 606 | T_LPAREN type_name T_RPAREN cast_expression { 607 $$ = cast($4, $2); 608 } 609 ; 610 611 expression_opt: 612 /* empty */ { 613 $$ = NULL; 614 } 615 | expression 616 ; 617 618 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 619 /* 'conditional_expression' also implements 'additive_expression'. */ 620 /* 'conditional_expression' also implements 'shift_expression'. */ 621 /* 'conditional_expression' also implements 'relational_expression'. */ 622 /* 'conditional_expression' also implements 'equality_expression'. */ 623 /* 'conditional_expression' also implements 'AND_expression'. */ 624 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 625 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 626 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 627 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 628 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 629 conditional_expression: 630 cast_expression 631 | conditional_expression T_ASTERISK sys conditional_expression { 632 $$ = build_binary($1, MULT, $3, $4); 633 } 634 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 635 $$ = build_binary($1, $2, $3, $4); 636 } 637 | conditional_expression T_ADDITIVE sys conditional_expression { 638 $$ = build_binary($1, $2, $3, $4); 639 } 640 | conditional_expression T_SHIFT sys conditional_expression { 641 $$ = build_binary($1, $2, $3, $4); 642 } 643 | conditional_expression T_RELATIONAL sys conditional_expression { 644 $$ = build_binary($1, $2, $3, $4); 645 } 646 | conditional_expression T_EQUALITY sys conditional_expression { 647 $$ = build_binary($1, $2, $3, $4); 648 } 649 | conditional_expression T_AMPER sys conditional_expression { 650 $$ = build_binary($1, BITAND, $3, $4); 651 } 652 | conditional_expression T_BITXOR sys conditional_expression { 653 $$ = build_binary($1, BITXOR, $3, $4); 654 } 655 | conditional_expression T_BITOR sys conditional_expression { 656 $$ = build_binary($1, BITOR, $3, $4); 657 } 658 | conditional_expression T_LOGAND sys conditional_expression { 659 $$ = build_binary($1, LOGAND, $3, $4); 660 } 661 | conditional_expression T_LOGOR sys conditional_expression { 662 $$ = build_binary($1, LOGOR, $3, $4); 663 } 664 | conditional_expression T_QUEST sys 665 expression T_COLON sys conditional_expression { 666 $$ = build_binary($1, QUEST, $3, 667 build_binary($4, COLON, $6, $7)); 668 } 669 ; 670 671 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 672 assignment_expression: 673 conditional_expression 674 | unary_expression T_ASSIGN sys assignment_expression { 675 $$ = build_binary($1, ASSIGN, $3, $4); 676 } 677 | unary_expression T_OPASSIGN sys assignment_expression { 678 $$ = build_binary($1, $2, $3, $4); 679 } 680 ; 681 682 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 683 expression: 684 assignment_expression 685 | expression T_COMMA sys assignment_expression { 686 $$ = build_binary($1, COMMA, $3, $4); 687 } 688 ; 689 690 constant_expr: /* C99 6.6 */ 691 conditional_expression 692 ; 693 694 declaration_or_error: 695 declaration 696 | error T_SEMI 697 ; 698 699 declaration: /* C99 6.7 */ 700 begin_type_declmods end_type T_SEMI { 701 if (dcs->d_scl == TYPEDEF) { 702 /* typedef declares no type name */ 703 warning(72); 704 } else { 705 /* empty declaration */ 706 warning(2); 707 } 708 } 709 | begin_type_declmods end_type notype_init_declarators T_SEMI { 710 if (dcs->d_scl == TYPEDEF) { 711 /* syntax error '%s' */ 712 error(249, "missing base type for typedef"); 713 } else { 714 /* old-style declaration; add 'int' */ 715 error(1); 716 } 717 } 718 | begin_type_declaration_specifiers end_type T_SEMI { 719 if (dcs->d_scl == TYPEDEF) { 720 /* typedef declares no type name */ 721 warning(72); 722 } else if (!dcs->d_nonempty_decl) { 723 /* empty declaration */ 724 warning(2); 725 } 726 } 727 | begin_type_declaration_specifiers end_type 728 type_init_declarators T_SEMI 729 | static_assert_declaration 730 ; 731 732 begin_type_declaration_specifiers: /* see C99 6.7 */ 733 begin_type_typespec { 734 dcs_add_type($1); 735 } 736 | begin_type_declmods type_specifier { 737 dcs_add_type($2); 738 } 739 | type_attribute begin_type_declaration_specifiers 740 | begin_type_declaration_specifiers declmod 741 | begin_type_declaration_specifiers notype_type_specifier { 742 dcs_add_type($2); 743 } 744 ; 745 746 begin_type_declmods: /* see C99 6.7 */ 747 begin_type T_QUAL { 748 dcs_add_qualifier($2); 749 } 750 | begin_type T_SCLASS { 751 dcs_add_storage_class($2); 752 } 753 | begin_type_declmods declmod 754 ; 755 756 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 757 begin_type_specifier_qualifier_list_postfix 758 | type_attribute_list begin_type_specifier_qualifier_list_postfix 759 ; 760 761 begin_type_specifier_qualifier_list_postfix: 762 begin_type_typespec { 763 dcs_add_type($1); 764 } 765 | begin_type_qualifier_list type_specifier { 766 dcs_add_type($2); 767 } 768 | begin_type_specifier_qualifier_list_postfix T_QUAL { 769 dcs_add_qualifier($2); 770 } 771 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 772 dcs_add_type($2); 773 } 774 | begin_type_specifier_qualifier_list_postfix type_attribute 775 ; 776 777 begin_type_typespec: 778 begin_type notype_type_specifier { 779 $$ = $2; 780 } 781 | begin_type T_TYPENAME { 782 $$ = getsym($2)->s_type; 783 } 784 ; 785 786 begin_type_qualifier_list: 787 begin_type T_QUAL { 788 dcs_add_qualifier($2); 789 } 790 | begin_type_qualifier_list T_QUAL { 791 dcs_add_qualifier($2); 792 } 793 ; 794 795 declmod: 796 T_QUAL { 797 dcs_add_qualifier($1); 798 } 799 | T_SCLASS { 800 dcs_add_storage_class($1); 801 } 802 | type_attribute_list 803 ; 804 805 type_attribute_list_opt: 806 /* empty */ 807 | type_attribute_list 808 ; 809 810 type_attribute_list: 811 type_attribute 812 | type_attribute_list type_attribute 813 ; 814 815 type_attribute_opt: 816 /* empty */ 817 | type_attribute 818 ; 819 820 type_attribute: /* See C11 6.7 declaration-specifiers */ 821 gcc_attribute_specifier 822 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 823 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 824 | T_PACKED { 825 dcs_add_packed(); 826 } 827 | T_NORETURN 828 ; 829 830 begin_type: 831 /* empty */ { 832 dcs_begin_type(); 833 } 834 ; 835 836 end_type: 837 /* empty */ { 838 dcs_end_type(); 839 } 840 ; 841 842 type_specifier: /* C99 6.7.2 */ 843 notype_type_specifier 844 | T_TYPENAME { 845 $$ = getsym($1)->s_type; 846 } 847 ; 848 849 notype_type_specifier: /* see C99 6.7.2 */ 850 T_TYPE { 851 $$ = gettyp($1); 852 } 853 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 854 $$ = $3 != NULL ? block_dup_type($3->tn_type) : gettyp(INT); 855 $$->t_typeof = true; 856 } 857 | struct_or_union_specifier { 858 end_declaration_level(); 859 $$ = $1; 860 } 861 | enum_specifier { 862 end_declaration_level(); 863 $$ = $1; 864 } 865 ; 866 867 struct_or_union_specifier: /* C99 6.7.2.1 */ 868 struct_or_union identifier_sym { 869 /* 870 * STDC requires that "struct a;" always introduces 871 * a new tag if "a" is not declared at current level 872 * 873 * yychar is valid because otherwise the parser would not 874 * have been able to decide if it must shift or reduce 875 */ 876 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 877 } 878 | struct_or_union identifier_sym { 879 dcs->d_tagtyp = make_tag_type($2, $1, true, false); 880 } braced_struct_declaration_list { 881 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 882 } 883 | struct_or_union { 884 dcs->d_tagtyp = make_tag_type(NULL, $1, true, false); 885 } braced_struct_declaration_list { 886 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 887 } 888 | struct_or_union error { 889 symtyp = FVFT; 890 $$ = gettyp(INT); 891 } 892 ; 893 894 struct_or_union: /* C99 6.7.2.1 */ 895 T_STRUCT_OR_UNION { 896 symtyp = FTAG; 897 begin_declaration_level($1 == STRUCT 898 ? DK_STRUCT_MEMBER 899 : DK_UNION_MEMBER); 900 dcs->d_offset_in_bits = 0; 901 dcs->d_sou_align_in_bits = CHAR_SIZE; 902 $$ = $1; 903 } 904 | struct_or_union type_attribute 905 ; 906 907 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 908 struct_declaration_lbrace struct_declaration_list_with_rbrace { 909 $$ = $2; 910 } 911 ; 912 913 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 914 T_LBRACE { 915 symtyp = FVFT; 916 } 917 ; 918 919 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 920 struct_declaration_list T_RBRACE 921 | T_RBRACE { 922 /* XXX: This is not allowed by any C standard. */ 923 $$ = NULL; 924 } 925 ; 926 927 struct_declaration_list: /* C99 6.7.2.1 */ 928 struct_declaration 929 | struct_declaration_list struct_declaration { 930 $$ = concat_lists($1, $2); 931 } 932 ; 933 934 struct_declaration: /* C99 6.7.2.1 */ 935 begin_type_qualifier_list end_type { 936 /* ^^ There is no check for the missing type-specifier. */ 937 /* too late, i know, but getsym() compensates it */ 938 symtyp = FMEMBER; 939 } notype_struct_declarators type_attribute_opt T_SEMI { 940 symtyp = FVFT; 941 $$ = $4; 942 } 943 | begin_type_specifier_qualifier_list end_type { 944 symtyp = FMEMBER; 945 } type_struct_declarators type_attribute_opt T_SEMI { 946 symtyp = FVFT; 947 $$ = $4; 948 } 949 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 950 /* syntax error '%s' */ 951 error(249, "member without type"); 952 $$ = NULL; 953 } 954 | begin_type_specifier_qualifier_list end_type type_attribute_opt 955 T_SEMI { 956 symtyp = FVFT; 957 if (!allow_c11 && !allow_gcc) 958 /* anonymous struct/union members is a C11 feature */ 959 warning(49); 960 if (is_struct_or_union(dcs->d_type->t_tspec)) { 961 $$ = dcs->d_type->t_str->sou_first_member; 962 /* add all the members of the anonymous struct/union */ 963 anonymize($$); 964 } else { 965 /* syntax error '%s' */ 966 error(249, "unnamed member"); 967 $$ = NULL; 968 } 969 } 970 | static_assert_declaration { 971 $$ = NULL; 972 } 973 | error T_SEMI { 974 symtyp = FVFT; 975 $$ = NULL; 976 } 977 ; 978 979 notype_struct_declarators: 980 notype_struct_declarator { 981 $$ = declarator_1_struct_union($1); 982 } 983 | notype_struct_declarators { 984 symtyp = FMEMBER; 985 } T_COMMA type_struct_declarator { 986 $$ = concat_lists($1, declarator_1_struct_union($4)); 987 } 988 ; 989 990 type_struct_declarators: 991 type_struct_declarator { 992 $$ = declarator_1_struct_union($1); 993 } 994 | type_struct_declarators { 995 symtyp = FMEMBER; 996 } T_COMMA type_struct_declarator { 997 $$ = concat_lists($1, declarator_1_struct_union($4)); 998 } 999 ; 1000 1001 notype_struct_declarator: 1002 notype_declarator 1003 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1004 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1005 } 1006 | { 1007 symtyp = FVFT; 1008 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1009 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1010 } 1011 ; 1012 1013 type_struct_declarator: 1014 type_declarator 1015 | type_declarator T_COLON constant_expr { 1016 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1017 } 1018 | { 1019 symtyp = FVFT; 1020 } T_COLON constant_expr { 1021 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1022 } 1023 ; 1024 1025 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1026 enum_specifier: /* C99 6.7.2.2 */ 1027 enum gcc_attribute_specifier_list_opt identifier_sym { 1028 $$ = make_tag_type($3, ENUM, false, false); 1029 } 1030 | enum gcc_attribute_specifier_list_opt identifier_sym { 1031 dcs->d_tagtyp = make_tag_type($3, ENUM, true, false); 1032 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1033 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1034 } 1035 | enum gcc_attribute_specifier_list_opt { 1036 dcs->d_tagtyp = make_tag_type(NULL, ENUM, true, false); 1037 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1038 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1039 } 1040 | enum error { 1041 symtyp = FVFT; 1042 $$ = gettyp(INT); 1043 } 1044 ; 1045 1046 enum: /* helper for C99 6.7.2.2 */ 1047 T_ENUM { 1048 symtyp = FTAG; 1049 begin_declaration_level(DK_ENUM_CONSTANT); 1050 } 1051 ; 1052 1053 enum_declaration: /* helper for C99 6.7.2.2 */ 1054 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1055 $$ = $2; 1056 } 1057 ; 1058 1059 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1060 T_LBRACE { 1061 symtyp = FVFT; 1062 enumval = 0; 1063 } 1064 ; 1065 1066 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1067 enumerator_list 1068 | enumerator_list T_COMMA { 1069 if (!allow_c99 && !allow_trad) { 1070 /* trailing ',' prohibited in enum declaration */ 1071 error(54); 1072 } else { 1073 /* trailing ',' prohibited in enum declaration */ 1074 c99ism(54); 1075 } 1076 $$ = $1; 1077 } 1078 ; 1079 1080 enumerator_list: /* C99 6.7.2.2 */ 1081 enumerator 1082 | enumerator_list T_COMMA enumerator { 1083 $$ = concat_lists($1, $3); 1084 } 1085 | error { 1086 $$ = NULL; 1087 } 1088 ; 1089 1090 enumerator: /* C99 6.7.2.2 */ 1091 identifier_sym gcc_attribute_specifier_list_opt { 1092 $$ = enumeration_constant($1, enumval, true); 1093 } 1094 | identifier_sym gcc_attribute_specifier_list_opt 1095 T_ASSIGN constant_expr { 1096 $$ = enumeration_constant($1, to_int_constant($4, true), 1097 false); 1098 } 1099 ; 1100 1101 type_qualifier: /* C99 6.7.3 */ 1102 T_QUAL 1103 ; 1104 1105 pointer: /* C99 6.7.5 */ 1106 asterisk type_qualifier_list_opt { 1107 $$ = merge_qualified_pointer($1, $2); 1108 } 1109 | asterisk type_qualifier_list_opt pointer { 1110 $$ = merge_qualified_pointer($1, $2); 1111 $$ = merge_qualified_pointer($$, $3); 1112 } 1113 ; 1114 1115 asterisk: /* helper for 'pointer' */ 1116 T_ASTERISK { 1117 $$ = xcalloc(1, sizeof(*$$)); 1118 $$->p_pointer = true; 1119 } 1120 ; 1121 1122 type_qualifier_list_opt: /* see C99 6.7.5 */ 1123 /* empty */ { 1124 $$ = NULL; 1125 } 1126 | type_qualifier_list 1127 ; 1128 1129 type_qualifier_list: /* C99 6.7.5 */ 1130 type_qualifier_list_elem 1131 | type_qualifier_list type_qualifier_list_elem { 1132 $$ = merge_qualified_pointer($1, $2); 1133 } 1134 ; 1135 1136 type_qualifier_list_elem: /* helper for 'pointer' */ 1137 type_qualifier { 1138 $$ = xcalloc(1, sizeof(*$$)); 1139 if ($1 == CONST) 1140 $$->p_const = true; 1141 if ($1 == VOLATILE) 1142 $$->p_volatile = true; 1143 } 1144 ; 1145 1146 /* 1147 * For an explanation of 'notype' in the following rules, see 1148 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1149 */ 1150 1151 notype_init_declarators: 1152 notype_init_declarator 1153 | notype_init_declarators T_COMMA type_init_declarator 1154 ; 1155 1156 type_init_declarators: 1157 type_init_declarator 1158 | type_init_declarators T_COMMA type_init_declarator 1159 ; 1160 1161 notype_init_declarator: 1162 notype_declarator asm_or_symbolrename_opt { 1163 cgram_declare($1, false, $2); 1164 check_size($1); 1165 } 1166 | notype_declarator asm_or_symbolrename_opt { 1167 begin_initialization($1); 1168 cgram_declare($1, true, $2); 1169 } T_ASSIGN initializer { 1170 check_size($1); 1171 end_initialization(); 1172 } 1173 ; 1174 1175 type_init_declarator: 1176 type_declarator asm_or_symbolrename_opt { 1177 cgram_declare($1, false, $2); 1178 check_size($1); 1179 } 1180 | type_declarator asm_or_symbolrename_opt { 1181 begin_initialization($1); 1182 cgram_declare($1, true, $2); 1183 } T_ASSIGN initializer { 1184 check_size($1); 1185 end_initialization(); 1186 } 1187 ; 1188 1189 notype_declarator: 1190 notype_direct_declarator 1191 | pointer notype_direct_declarator { 1192 $$ = add_pointer($2, $1); 1193 } 1194 ; 1195 1196 type_declarator: 1197 type_direct_declarator 1198 | pointer type_direct_declarator { 1199 $$ = add_pointer($2, $1); 1200 } 1201 ; 1202 1203 notype_direct_declarator: 1204 type_attribute_list_opt T_NAME { 1205 $$ = declarator_name(getsym($2)); 1206 } 1207 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1208 $$ = $3; 1209 } 1210 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1211 $$ = add_array($1, $3.has_dim, $3.dim); 1212 } 1213 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1214 $$ = add_function(symbolrename($1, $3), $2); 1215 end_declaration_level(); 1216 block_level--; 1217 } 1218 | notype_direct_declarator type_attribute 1219 ; 1220 1221 type_direct_declarator: 1222 type_attribute_list_opt identifier { 1223 $$ = declarator_name(getsym($2)); 1224 } 1225 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1226 $$ = $3; 1227 } 1228 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1229 $$ = add_array($1, $3.has_dim, $3.dim); 1230 } 1231 | type_direct_declarator param_list asm_or_symbolrename_opt { 1232 $$ = add_function(symbolrename($1, $3), $2); 1233 end_declaration_level(); 1234 block_level--; 1235 } 1236 | type_direct_declarator type_attribute 1237 ; 1238 1239 /* 1240 * The two distinct rules type_param_declarator and notype_param_declarator 1241 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1242 * always treated as a typename, not an argument name. For example, after 1243 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1244 * "f(int (double));", not "f(int a);". 1245 */ 1246 type_param_declarator: 1247 direct_param_declarator 1248 | pointer direct_param_declarator { 1249 $$ = add_pointer($2, $1); 1250 } 1251 ; 1252 1253 notype_param_declarator: 1254 direct_notype_param_declarator 1255 | pointer direct_notype_param_declarator { 1256 $$ = add_pointer($2, $1); 1257 } 1258 ; 1259 1260 direct_param_declarator: 1261 identifier type_attribute_list { 1262 $$ = declarator_name(getsym($1)); 1263 } 1264 | identifier { 1265 $$ = declarator_name(getsym($1)); 1266 } 1267 | T_LPAREN notype_param_declarator T_RPAREN { 1268 $$ = $2; 1269 } 1270 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1271 gcc_attribute_specifier_list_opt { 1272 $$ = add_array($1, $3.has_dim, $3.dim); 1273 } 1274 | direct_param_declarator param_list asm_or_symbolrename_opt { 1275 $$ = add_function(symbolrename($1, $3), $2); 1276 end_declaration_level(); 1277 block_level--; 1278 } 1279 ; 1280 1281 direct_notype_param_declarator: 1282 identifier { 1283 $$ = declarator_name(getsym($1)); 1284 } 1285 | T_LPAREN notype_param_declarator T_RPAREN { 1286 $$ = $2; 1287 } 1288 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1289 $$ = add_array($1, $3.has_dim, $3.dim); 1290 } 1291 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1292 $$ = add_function(symbolrename($1, $3), $2); 1293 end_declaration_level(); 1294 block_level--; 1295 } 1296 ; 1297 1298 param_list: 1299 id_list_lparen identifier_list T_RPAREN { 1300 $$ = $2; 1301 } 1302 | abstract_decl_param_list 1303 ; 1304 1305 id_list_lparen: 1306 T_LPAREN { 1307 block_level++; 1308 begin_declaration_level(DK_PROTO_ARG); 1309 } 1310 ; 1311 1312 array_size_opt: 1313 /* empty */ { 1314 $$.has_dim = false; 1315 $$.dim = 0; 1316 } 1317 | T_ASTERISK { 1318 /* since C99; variable length array of unspecified size */ 1319 $$.has_dim = false; /* TODO: maybe change to true */ 1320 $$.dim = 0; /* just as a placeholder */ 1321 } 1322 | array_size { 1323 $$.has_dim = true; 1324 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1325 } 1326 ; 1327 1328 array_size: 1329 type_qualifier_list_opt T_SCLASS constant_expr { 1330 /* C11 6.7.6.3p7 */ 1331 if ($2 != STATIC) 1332 yyerror("Bad attribute"); 1333 /* static array size is a C11 extension */ 1334 c11ism(343); 1335 $$ = $3; 1336 } 1337 | T_QUAL { 1338 /* C11 6.7.6.2 */ 1339 if ($1 != RESTRICT) 1340 yyerror("Bad attribute"); 1341 $$ = NULL; 1342 } 1343 | constant_expr 1344 ; 1345 1346 identifier_list: /* C99 6.7.5 */ 1347 T_NAME { 1348 $$ = old_style_function_name(getsym($1)); 1349 } 1350 | identifier_list T_COMMA T_NAME { 1351 $$ = concat_lists($1, old_style_function_name(getsym($3))); 1352 } 1353 | identifier_list error 1354 ; 1355 1356 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1357 type_name: /* C99 6.7.6 */ 1358 { 1359 begin_declaration_level(DK_ABSTRACT); 1360 } abstract_declaration { 1361 end_declaration_level(); 1362 $$ = $2->s_type; 1363 } 1364 ; 1365 1366 abstract_declaration: /* specific to lint */ 1367 begin_type_qualifier_list end_type { 1368 $$ = declare_1_abstract(abstract_name()); 1369 } 1370 | begin_type_specifier_qualifier_list end_type { 1371 $$ = declare_1_abstract(abstract_name()); 1372 } 1373 | begin_type_qualifier_list end_type abstract_declarator { 1374 $$ = declare_1_abstract($3); 1375 } 1376 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1377 $$ = declare_1_abstract($3); 1378 } 1379 ; 1380 1381 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1382 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1383 abstract_declarator: 1384 pointer { 1385 $$ = add_pointer(abstract_name(), $1); 1386 } 1387 | direct_abstract_declarator 1388 | pointer direct_abstract_declarator { 1389 $$ = add_pointer($2, $1); 1390 } 1391 | type_attribute_list direct_abstract_declarator { 1392 $$ = $2; 1393 } 1394 | pointer type_attribute_list direct_abstract_declarator { 1395 $$ = add_pointer($3, $1); 1396 } 1397 ; 1398 1399 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1400 direct_abstract_declarator: 1401 /* TODO: sort rules according to C99 */ 1402 T_LPAREN abstract_declarator T_RPAREN { 1403 $$ = $2; 1404 } 1405 | T_LBRACK array_size_opt T_RBRACK { 1406 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1407 } 1408 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1409 $$ = add_array($1, $3.has_dim, $3.dim); 1410 } 1411 | abstract_decl_param_list asm_or_symbolrename_opt { 1412 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1413 end_declaration_level(); 1414 block_level--; 1415 } 1416 | direct_abstract_declarator abstract_decl_param_list 1417 asm_or_symbolrename_opt { 1418 $$ = add_function(symbolrename($1, $3), $2); 1419 end_declaration_level(); 1420 block_level--; 1421 } 1422 | direct_abstract_declarator type_attribute_list 1423 ; 1424 1425 abstract_decl_param_list: /* specific to lint */ 1426 abstract_decl_lparen T_RPAREN type_attribute_opt { 1427 $$ = NULL; 1428 } 1429 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1430 type_attribute_opt { 1431 dcs->d_proto = true; 1432 $$ = $2; 1433 } 1434 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1435 $$ = NULL; 1436 } 1437 ; 1438 1439 abstract_decl_lparen: /* specific to lint */ 1440 T_LPAREN { 1441 block_level++; 1442 begin_declaration_level(DK_PROTO_ARG); 1443 } 1444 ; 1445 1446 vararg_parameter_type_list: /* specific to lint */ 1447 parameter_type_list 1448 | parameter_type_list T_COMMA T_ELLIPSIS { 1449 dcs->d_vararg = true; 1450 $$ = $1; 1451 } 1452 | T_ELLIPSIS { 1453 /* TODO: C99 6.7.5 makes this an error as well. */ 1454 if (!allow_trad && !allow_c99) { 1455 /* ANSI C requires formal parameter before '...' */ 1456 error(84); 1457 } else if (allow_c90) { 1458 /* ANSI C requires formal parameter before '...' */ 1459 warning(84); 1460 } 1461 dcs->d_vararg = true; 1462 $$ = NULL; 1463 } 1464 ; 1465 1466 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1467 parameter_type_list: 1468 parameter_declaration 1469 | parameter_type_list T_COMMA parameter_declaration { 1470 $$ = concat_lists($1, $3); 1471 } 1472 ; 1473 1474 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1475 parameter_declaration: 1476 begin_type_declmods end_type { 1477 /* ^^ There is no check for the missing type-specifier. */ 1478 $$ = declare_argument(abstract_name(), false); 1479 } 1480 | begin_type_declaration_specifiers end_type { 1481 $$ = declare_argument(abstract_name(), false); 1482 } 1483 | begin_type_declmods end_type notype_param_declarator { 1484 /* ^^ There is no check for the missing type-specifier. */ 1485 $$ = declare_argument($3, false); 1486 } 1487 /* 1488 * type_param_declarator is needed because of following conflict: 1489 * "typedef int a; f(int (a));" could be parsed as 1490 * "function with argument a of type int", or 1491 * "function with an abstract argument of type function". 1492 * This grammar realizes the second case. 1493 */ 1494 | begin_type_declaration_specifiers end_type type_param_declarator { 1495 $$ = declare_argument($3, false); 1496 } 1497 | begin_type_declmods end_type abstract_declarator { 1498 /* ^^ There is no check for the missing type-specifier. */ 1499 $$ = declare_argument($3, false); 1500 } 1501 | begin_type_declaration_specifiers end_type abstract_declarator { 1502 $$ = declare_argument($3, false); 1503 } 1504 ; 1505 1506 initializer: /* C99 6.7.8 "Initialization" */ 1507 assignment_expression { 1508 init_expr($1); 1509 } 1510 | init_lbrace init_rbrace { 1511 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1512 } 1513 | init_lbrace initializer_list comma_opt init_rbrace 1514 /* XXX: What is this error handling for? */ 1515 | error 1516 ; 1517 1518 initializer_list: /* C99 6.7.8 "Initialization" */ 1519 initializer_list_item 1520 | initializer_list T_COMMA initializer_list_item 1521 ; 1522 1523 initializer_list_item: /* helper */ 1524 designation initializer 1525 | initializer 1526 ; 1527 1528 designation: /* C99 6.7.8 "Initialization" */ 1529 begin_designation designator_list T_ASSIGN 1530 | identifier T_COLON { 1531 /* GCC style struct or union member name in initializer */ 1532 gnuism(315); 1533 begin_designation(); 1534 add_designator_member($1); 1535 } 1536 ; 1537 1538 begin_designation: /* lint-specific helper */ 1539 /* empty */ { 1540 begin_designation(); 1541 } 1542 ; 1543 1544 designator_list: /* C99 6.7.8 "Initialization" */ 1545 designator 1546 | designator_list designator 1547 ; 1548 1549 designator: /* C99 6.7.8 "Initialization" */ 1550 T_LBRACK range T_RBRACK { 1551 if (!allow_c99) 1552 /* array initializer with designators is a C99 ... */ 1553 warning(321); 1554 add_designator_subscript($2); 1555 } 1556 | T_POINT identifier { 1557 if (!allow_c99) 1558 /* struct or union member name in initializer is ... */ 1559 warning(313); 1560 add_designator_member($2); 1561 } 1562 ; 1563 1564 static_assert_declaration: 1565 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1566 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1567 ; 1568 1569 range: 1570 constant_expr { 1571 $$.lo = to_int_constant($1, true); 1572 $$.hi = $$.lo; 1573 } 1574 | constant_expr T_ELLIPSIS constant_expr { 1575 $$.lo = to_int_constant($1, true); 1576 $$.hi = to_int_constant($3, true); 1577 /* initialization with '[a...b]' is a GCC extension */ 1578 gnuism(340); 1579 } 1580 ; 1581 1582 init_lbrace: /* helper */ 1583 T_LBRACE { 1584 init_lbrace(); 1585 } 1586 ; 1587 1588 init_rbrace: /* helper */ 1589 T_RBRACE { 1590 init_rbrace(); 1591 } 1592 ; 1593 1594 asm_or_symbolrename_opt: /* GCC extensions */ 1595 /* empty */ { 1596 $$ = NULL; 1597 } 1598 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1599 freeyyv(&$3, T_STRING); 1600 $$ = NULL; 1601 } 1602 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1603 gcc_attribute_specifier_list_opt { 1604 $$ = $3; 1605 } 1606 ; 1607 1608 statement: /* C99 6.8 */ 1609 expression_statement 1610 | non_expr_statement 1611 ; 1612 1613 non_expr_statement: /* helper for C99 6.8 */ 1614 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1615 | labeled_statement 1616 | compound_statement 1617 | selection_statement 1618 | iteration_statement 1619 | jump_statement { 1620 seen_fallthrough = false; 1621 } 1622 | asm_statement 1623 ; 1624 1625 labeled_statement: /* C99 6.8.1 */ 1626 label gcc_attribute_specifier_list_opt statement 1627 ; 1628 1629 label: 1630 T_NAME T_COLON { 1631 symtyp = FLABEL; 1632 named_label(getsym($1)); 1633 } 1634 | T_CASE constant_expr T_COLON { 1635 case_label($2); 1636 seen_fallthrough = true; 1637 } 1638 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1639 /* XXX: We don't fill all cases */ 1640 case_label($2); 1641 seen_fallthrough = true; 1642 } 1643 | T_DEFAULT T_COLON { 1644 default_label(); 1645 seen_fallthrough = true; 1646 } 1647 ; 1648 1649 compound_statement: /* C99 6.8.2 */ 1650 compound_statement_lbrace compound_statement_rbrace 1651 | compound_statement_lbrace block_item_list compound_statement_rbrace 1652 ; 1653 1654 compound_statement_lbrace: 1655 T_LBRACE { 1656 block_level++; 1657 mem_block_level++; 1658 begin_declaration_level(DK_AUTO); 1659 } 1660 ; 1661 1662 compound_statement_rbrace: 1663 T_RBRACE { 1664 end_declaration_level(); 1665 level_free_all(mem_block_level); 1666 mem_block_level--; 1667 block_level--; 1668 seen_fallthrough = false; 1669 } 1670 ; 1671 1672 block_item_list: /* C99 6.8.2 */ 1673 block_item 1674 | block_item_list block_item { 1675 if ($1 && !$2) 1676 /* declarations after statements is a C99 feature */ 1677 c99ism(327); 1678 $$ = $1 || $2; 1679 } 1680 ; 1681 1682 block_item: /* C99 6.8.2 */ 1683 declaration_or_error { 1684 $$ = false; 1685 restore_warning_flags(); 1686 } 1687 | statement { 1688 $$ = true; 1689 restore_warning_flags(); 1690 } 1691 ; 1692 1693 expression_statement: /* C99 6.8.3 */ 1694 expression T_SEMI { 1695 expr($1, false, false, false, false); 1696 seen_fallthrough = false; 1697 } 1698 | T_SEMI { 1699 check_statement_reachable(); 1700 seen_fallthrough = false; 1701 } 1702 ; 1703 1704 selection_statement: /* C99 6.8.4 */ 1705 if_without_else %prec T_THEN { 1706 save_warning_flags(); 1707 if2(); 1708 if3(false); 1709 } 1710 | if_without_else T_ELSE { 1711 save_warning_flags(); 1712 if2(); 1713 } statement { 1714 clear_warning_flags(); 1715 if3(true); 1716 } 1717 | if_without_else T_ELSE error { 1718 clear_warning_flags(); 1719 if3(false); 1720 } 1721 | switch_expr statement { 1722 clear_warning_flags(); 1723 switch2(); 1724 } 1725 | switch_expr error { 1726 clear_warning_flags(); 1727 switch2(); 1728 } 1729 ; 1730 1731 if_without_else: /* see C99 6.8.4 */ 1732 if_expr statement 1733 | if_expr error 1734 ; 1735 1736 if_expr: /* see C99 6.8.4 */ 1737 T_IF T_LPAREN expression T_RPAREN { 1738 if1($3); 1739 clear_warning_flags(); 1740 } 1741 ; 1742 1743 switch_expr: /* see C99 6.8.4 */ 1744 T_SWITCH T_LPAREN expression T_RPAREN { 1745 switch1($3); 1746 clear_warning_flags(); 1747 } 1748 ; 1749 1750 iteration_statement: /* C99 6.8.5 */ 1751 while_expr statement { 1752 clear_warning_flags(); 1753 while2(); 1754 } 1755 | while_expr error { 1756 clear_warning_flags(); 1757 while2(); 1758 } 1759 | do_statement do_while_expr { 1760 do2($2); 1761 seen_fallthrough = false; 1762 } 1763 | do error { 1764 clear_warning_flags(); 1765 do2(NULL); 1766 } 1767 | for_exprs statement { 1768 clear_warning_flags(); 1769 for2(); 1770 end_declaration_level(); 1771 block_level--; 1772 } 1773 | for_exprs error { 1774 clear_warning_flags(); 1775 for2(); 1776 end_declaration_level(); 1777 block_level--; 1778 } 1779 ; 1780 1781 while_expr: /* see C99 6.8.5 */ 1782 T_WHILE T_LPAREN expression T_RPAREN { 1783 while1($3); 1784 clear_warning_flags(); 1785 } 1786 ; 1787 1788 do_statement: /* see C99 6.8.5 */ 1789 do statement { 1790 clear_warning_flags(); 1791 } 1792 ; 1793 1794 do: /* see C99 6.8.5 */ 1795 T_DO { 1796 do1(); 1797 } 1798 ; 1799 1800 do_while_expr: /* see C99 6.8.5 */ 1801 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1802 $$ = $3; 1803 } 1804 ; 1805 1806 for_start: /* see C99 6.8.5 */ 1807 T_FOR T_LPAREN { 1808 begin_declaration_level(DK_AUTO); 1809 block_level++; 1810 } 1811 ; 1812 1813 for_exprs: /* see C99 6.8.5 */ 1814 for_start 1815 begin_type_declaration_specifiers end_type 1816 notype_init_declarators T_SEMI 1817 expression_opt T_SEMI 1818 expression_opt T_RPAREN { 1819 /* variable declaration in for loop */ 1820 c99ism(325); 1821 for1(NULL, $6, $8); 1822 clear_warning_flags(); 1823 } 1824 | for_start 1825 expression_opt T_SEMI 1826 expression_opt T_SEMI 1827 expression_opt T_RPAREN { 1828 for1($2, $4, $6); 1829 clear_warning_flags(); 1830 } 1831 ; 1832 1833 jump_statement: /* C99 6.8.6 */ 1834 goto identifier T_SEMI { 1835 do_goto(getsym($2)); 1836 } 1837 | goto error T_SEMI { 1838 symtyp = FVFT; 1839 } 1840 | T_CONTINUE T_SEMI { 1841 do_continue(); 1842 } 1843 | T_BREAK T_SEMI { 1844 do_break(); 1845 } 1846 | T_RETURN sys T_SEMI { 1847 do_return($2, NULL); 1848 } 1849 | T_RETURN sys expression T_SEMI { 1850 do_return($2, $3); 1851 } 1852 ; 1853 1854 goto: /* see C99 6.8.6 */ 1855 T_GOTO { 1856 symtyp = FLABEL; 1857 } 1858 ; 1859 1860 asm_statement: /* GCC extension */ 1861 T_ASM T_LPAREN read_until_rparen T_SEMI { 1862 dcs_set_asm(); 1863 } 1864 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1865 dcs_set_asm(); 1866 } 1867 | T_ASM error 1868 ; 1869 1870 read_until_rparen: /* helper for 'asm_statement' */ 1871 /* empty */ { 1872 read_until_rparen(); 1873 } 1874 ; 1875 1876 translation_unit: /* C99 6.9 */ 1877 external_declaration 1878 | translation_unit external_declaration 1879 ; 1880 1881 external_declaration: /* C99 6.9 */ 1882 function_definition { 1883 global_clean_up_decl(false); 1884 clear_warning_flags(); 1885 } 1886 | top_level_declaration { 1887 global_clean_up_decl(false); 1888 clear_warning_flags(); 1889 } 1890 | asm_statement /* GCC extension */ 1891 | T_SEMI { /* GCC extension */ 1892 /* 1893 * TODO: Only allow this in GCC mode, not in plain C99. 1894 * This is one of the top 10 warnings in the NetBSD build. 1895 */ 1896 if (!allow_trad && !allow_c99) { 1897 /* empty declaration */ 1898 error(0); 1899 } else if (allow_c90) { 1900 /* empty declaration */ 1901 warning(0); 1902 } 1903 } 1904 ; 1905 1906 /* 1907 * On the top level, lint allows several forms of declarations that it doesn't 1908 * allow in functions. For example, a single ';' is an empty declaration and 1909 * is supported by some compilers, but in a function it would be an empty 1910 * statement, not a declaration. This makes a difference in C90 mode, where 1911 * a statement must not be followed by a declaration. 1912 * 1913 * See 'declaration' for all other declarations. 1914 */ 1915 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1916 begin_type end_type notype_init_declarators T_SEMI { 1917 /* TODO: Make this an error in C99 mode as well. */ 1918 if (!allow_trad && !allow_c99) { 1919 /* old-style declaration; add 'int' */ 1920 error(1); 1921 } else if (allow_c90) { 1922 /* old-style declaration; add 'int' */ 1923 warning(1); 1924 } 1925 } 1926 | declaration 1927 | error T_SEMI { 1928 global_clean_up(); 1929 } 1930 | error T_RBRACE { 1931 global_clean_up(); 1932 } 1933 ; 1934 1935 function_definition: /* C99 6.9.1 */ 1936 func_declarator { 1937 if ($1->s_type->t_tspec != FUNC) { 1938 /* syntax error '%s' */ 1939 error(249, yytext); 1940 YYERROR; 1941 } 1942 if ($1->s_type->t_typedef) { 1943 /* ()-less function definition */ 1944 error(64); 1945 YYERROR; 1946 } 1947 funcdef($1); 1948 block_level++; 1949 begin_declaration_level(DK_OLD_STYLE_ARG); 1950 if (lwarn == LWARN_NONE) 1951 $1->s_used = true; 1952 } arg_declaration_list_opt { 1953 end_declaration_level(); 1954 block_level--; 1955 check_func_lint_directives(); 1956 check_func_old_style_arguments(); 1957 begin_control_statement(CS_FUNCTION_BODY); 1958 } compound_statement { 1959 funcend(); 1960 end_control_statement(CS_FUNCTION_BODY); 1961 } 1962 ; 1963 1964 func_declarator: 1965 begin_type end_type notype_declarator { 1966 if (!allow_trad) { 1967 /* old-style declaration; add 'int' */ 1968 error(1); 1969 } 1970 $$ = $3; 1971 } 1972 | begin_type_declmods end_type notype_declarator { 1973 if (!allow_trad) { 1974 /* old-style declaration; add 'int' */ 1975 error(1); 1976 } 1977 $$ = $3; 1978 } 1979 | begin_type_declaration_specifiers end_type type_declarator { 1980 $$ = $3; 1981 } 1982 ; 1983 1984 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1985 /* empty */ 1986 | arg_declaration_list 1987 ; 1988 1989 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1990 arg_declaration 1991 | arg_declaration_list arg_declaration 1992 /* XXX or better "arg_declaration error" ? */ 1993 | error 1994 ; 1995 1996 /* 1997 * "arg_declaration" is separated from "declaration" because it 1998 * needs other error handling. 1999 */ 2000 arg_declaration: 2001 begin_type_declmods end_type T_SEMI { 2002 /* empty declaration */ 2003 warning(2); 2004 } 2005 | begin_type_declmods end_type notype_init_declarators T_SEMI 2006 | begin_type_declaration_specifiers end_type T_SEMI { 2007 if (!dcs->d_nonempty_decl) { 2008 /* empty declaration */ 2009 warning(2); 2010 } else { 2011 /* '%s' declared in argument declaration list */ 2012 warning(3, type_name(dcs->d_type)); 2013 } 2014 } 2015 | begin_type_declaration_specifiers end_type 2016 type_init_declarators T_SEMI { 2017 if (dcs->d_nonempty_decl) { 2018 /* '%s' declared in argument declaration list */ 2019 warning(3, type_name(dcs->d_type)); 2020 } 2021 } 2022 | begin_type_declmods error 2023 | begin_type_declaration_specifiers error 2024 ; 2025 2026 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2027 gcc_attribute_specifier_list_opt: 2028 /* empty */ 2029 | gcc_attribute_specifier_list 2030 ; 2031 2032 gcc_attribute_specifier_list: 2033 gcc_attribute_specifier 2034 | gcc_attribute_specifier_list gcc_attribute_specifier 2035 ; 2036 2037 gcc_attribute_specifier: 2038 T_ATTRIBUTE T_LPAREN T_LPAREN { 2039 in_gcc_attribute = true; 2040 } gcc_attribute_list { 2041 in_gcc_attribute = false; 2042 } T_RPAREN T_RPAREN 2043 ; 2044 2045 gcc_attribute_list: 2046 gcc_attribute 2047 | gcc_attribute_list T_COMMA gcc_attribute 2048 ; 2049 2050 gcc_attribute: 2051 /* empty */ 2052 | T_NAME { 2053 const char *name = $1->sb_name; 2054 if (is_either(name, "packed", "__packed__")) 2055 dcs_add_packed(); 2056 else if (is_either(name, "used", "__used__") || 2057 is_either(name, "unused", "__unused__")) 2058 dcs_set_used(); 2059 else if (is_either(name, "fallthrough", 2060 "__fallthrough__")) 2061 fallthru(1); 2062 } 2063 | T_NAME T_LPAREN T_RPAREN 2064 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2065 | T_QUAL { 2066 if ($1 != CONST) 2067 yyerror("Bad attribute"); 2068 } 2069 ; 2070 2071 gcc_attribute_parameters: 2072 constant_expr 2073 | gcc_attribute_parameters T_COMMA constant_expr 2074 ; 2075 2076 sys: 2077 /* empty */ { 2078 $$ = in_system_header; 2079 } 2080 ; 2081 2082 %% 2083 2084 /* ARGSUSED */ 2085 int 2086 yyerror(const char *msg) 2087 { 2088 /* syntax error '%s' */ 2089 error(249, yytext); 2090 if (++sytxerr >= 5) 2091 norecover(); 2092 return 0; 2093 } 2094 2095 #if YYDEBUG && (YYBYACC || YYBISON) 2096 static const char * 2097 cgram_to_string(int token, YYSTYPE val) 2098 { 2099 2100 switch (token) { 2101 case T_INCDEC: 2102 case T_MULTIPLICATIVE: 2103 case T_ADDITIVE: 2104 case T_SHIFT: 2105 case T_RELATIONAL: 2106 case T_EQUALITY: 2107 case T_OPASSIGN: 2108 return modtab[val.y_op].m_name; 2109 case T_SCLASS: 2110 return scl_name(val.y_scl); 2111 case T_TYPE: 2112 case T_STRUCT_OR_UNION: 2113 return tspec_name(val.y_tspec); 2114 case T_QUAL: 2115 return tqual_name(val.y_tqual); 2116 case T_NAME: 2117 return val.y_name->sb_name; 2118 default: 2119 return "<none>"; 2120 } 2121 } 2122 #endif 2123 2124 #if YYDEBUG && YYBISON 2125 static inline void 2126 cgram_print(FILE *output, int token, YYSTYPE val) 2127 { 2128 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2129 } 2130 #endif 2131 2132 static void 2133 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2134 { 2135 declare(decl, initflg, renaming); 2136 if (renaming != NULL) 2137 freeyyv(&renaming, T_NAME); 2138 } 2139 2140 /* 2141 * Discard all input tokens up to and including the next 2142 * unmatched right paren 2143 */ 2144 static void 2145 read_until_rparen(void) 2146 { 2147 int level; 2148 2149 if (yychar < 0) 2150 yychar = yylex(); 2151 freeyyv(&yylval, yychar); 2152 2153 level = 1; 2154 while (yychar > 0) { 2155 if (yychar == T_LPAREN) 2156 level++; 2157 if (yychar == T_RPAREN && --level == 0) 2158 break; 2159 freeyyv(&yylval, yychar = yylex()); 2160 } 2161 2162 yyclearin; 2163 } 2164 2165 static sym_t * 2166 symbolrename(sym_t *s, sbuf_t *sb) 2167 { 2168 if (sb != NULL) 2169 s->s_rename = sb->sb_name; 2170 return s; 2171 } 2172
Indexes created Fri Oct 03 02:09:57 GMT 2025