cgram.y revision 1.425
1 %{ 2 /* $NetBSD: cgram.y,v 1.425 2023/01/14 10:33:34 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 1.425 2023/01/14 10:33:34 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_qual_ptr> 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_sym> notype_declarator 300 %type <y_sym> type_declarator 301 %type <y_sym> notype_direct_declarator 302 %type <y_sym> type_direct_declarator 303 %type <y_sym> type_param_declarator 304 %type <y_sym> notype_param_declarator 305 %type <y_sym> direct_param_declarator 306 %type <y_sym> direct_notype_param_declarator 307 %type <y_sym> param_list 308 %type <y_array_size> array_size_opt 309 %type <y_tnode> array_size 310 %type <y_sym> identifier_list 311 %type <y_type> type_name 312 %type <y_sym> abstract_declaration 313 %type <y_sym> abstract_declarator 314 %type <y_sym> direct_abstract_declarator 315 %type <y_sym> abstract_decl_param_list 316 %type <y_sym> vararg_parameter_type_list 317 %type <y_sym> parameter_type_list 318 %type <y_sym> parameter_declaration 319 %type <y_range> range 320 %type <y_name> asm_or_symbolrename_opt 321 322 %type <y_seen_statement> block_item_list 323 %type <y_seen_statement> block_item 324 %type <y_tnode> do_while_expr 325 %type <y_sym> func_declarator 326 %type <y_in_system_header> sys 327 328 %{ 329 #if YYDEBUG && YYBISON 330 static inline void cgram_print(FILE *, int, YYSTYPE); 331 #endif 332 %} 333 334 %% 335 336 program: 337 /* empty */ { 338 /* TODO: Make this an error in C99 mode as well. */ 339 if (!allow_trad && !allow_c99) { 340 /* empty translation unit */ 341 error(272); 342 } else if (allow_c90) { 343 /* empty translation unit */ 344 warning(272); 345 } 346 } 347 | translation_unit 348 ; 349 350 identifier_sym: /* helper for struct/union/enum */ 351 identifier { 352 $$ = getsym($1); 353 } 354 ; 355 356 /* K&R ???, C90 ???, C99 6.4.2.1, C11 ??? */ 357 identifier: 358 T_NAME { 359 debug_step("cgram: name '%s'", $1->sb_name); 360 $$ = $1; 361 } 362 | T_TYPENAME { 363 debug_step("cgram: typename '%s'", $1->sb_name); 364 $$ = $1; 365 } 366 ; 367 368 /* see C99 6.4.5, string literals are joined by 5.1.1.2 */ 369 string: 370 T_STRING 371 | string T_STRING { 372 if (!allow_c90) { 373 /* concatenated strings are illegal in traditional C */ 374 warning(219); 375 } 376 $$ = cat_strings($1, $2); 377 } 378 ; 379 380 /* K&R 7.1, C90 ???, C99 6.5.1, C11 6.5.1 */ 381 primary_expression: 382 T_NAME { 383 bool sys_name, sys_next; 384 sys_name = in_system_header; 385 if (yychar < 0) 386 yychar = yylex(); 387 sys_next = in_system_header; 388 in_system_header = sys_name; 389 $$ = build_name(getsym($1), yychar == T_LPAREN); 390 in_system_header = sys_next; 391 } 392 | T_CON { 393 $$ = build_constant(gettyp($1->v_tspec), $1); 394 } 395 | string { 396 $$ = build_string($1); 397 } 398 | T_LPAREN expression T_RPAREN { 399 if ($2 != NULL) 400 $2->tn_parenthesized = true; 401 $$ = $2; 402 } 403 | generic_selection 404 /* GCC primary-expression, see c_parser_postfix_expression */ 405 | T_BUILTIN_OFFSETOF T_LPAREN type_name T_COMMA identifier T_RPAREN { 406 symtyp = FMEMBER; 407 $$ = build_offsetof($3, getsym($5)); 408 } 409 ; 410 411 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 412 generic_selection: 413 T_GENERIC T_LPAREN assignment_expression T_COMMA 414 generic_assoc_list T_RPAREN { 415 /* generic selection requires C11 or later */ 416 c11ism(345); 417 $$ = build_generic_selection($3, $5); 418 } 419 ; 420 421 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 422 generic_assoc_list: 423 generic_association 424 | generic_assoc_list T_COMMA generic_association { 425 $3->ga_prev = $1; 426 $$ = $3; 427 } 428 ; 429 430 /* K&R ---, C90 ---, C99 ---, C11 6.5.1.1 */ 431 generic_association: 432 type_name T_COLON assignment_expression { 433 $$ = block_zero_alloc(sizeof(*$$)); 434 $$->ga_arg = $1; 435 $$->ga_result = $3; 436 } 437 | T_DEFAULT T_COLON assignment_expression { 438 $$ = block_zero_alloc(sizeof(*$$)); 439 $$->ga_arg = NULL; 440 $$->ga_result = $3; 441 } 442 ; 443 444 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 445 postfix_expression: 446 primary_expression 447 | postfix_expression T_LBRACK sys expression T_RBRACK { 448 $$ = build_unary(INDIR, $3, build_binary($1, PLUS, $3, $4)); 449 } 450 | postfix_expression T_LPAREN sys T_RPAREN { 451 $$ = build_function_call($1, $3, NULL); 452 } 453 | postfix_expression T_LPAREN sys argument_expression_list T_RPAREN { 454 $$ = build_function_call($1, $3, $4); 455 } 456 | postfix_expression point_or_arrow sys T_NAME { 457 $$ = build_member_access($1, $2, $3, $4); 458 } 459 | postfix_expression T_INCDEC sys { 460 $$ = build_unary($2 == INC ? INCAFT : DECAFT, $3, $1); 461 } 462 | T_LPAREN type_name T_RPAREN { /* C99 6.5.2.5 "Compound literals" */ 463 sym_t *tmp = mktempsym($2); 464 begin_initialization(tmp); 465 cgram_declare(tmp, true, NULL); 466 } init_lbrace initializer_list comma_opt init_rbrace { 467 if (!allow_c99) 468 /* compound literals are a C99/GCC extension */ 469 gnuism(319); 470 $$ = build_name(*current_initsym(), false); 471 end_initialization(); 472 } 473 | T_LPAREN compound_statement_lbrace { 474 begin_statement_expr(); 475 } gcc_statement_expr_list { 476 do_statement_expr($4); 477 } compound_statement_rbrace T_RPAREN { 478 $$ = end_statement_expr(); 479 } 480 ; 481 482 comma_opt: /* helper for 'postfix_expression' */ 483 /* empty */ 484 | T_COMMA 485 ; 486 487 /* 488 * The inner part of a GCC statement-expression of the form ({ ... }). 489 * 490 * https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html 491 */ 492 gcc_statement_expr_list: 493 gcc_statement_expr_item 494 | gcc_statement_expr_list gcc_statement_expr_item { 495 $$ = $2; 496 } 497 ; 498 499 gcc_statement_expr_item: 500 declaration_or_error { 501 clear_warning_flags(); 502 $$ = NULL; 503 } 504 | non_expr_statement { 505 $$ = expr_alloc_tnode(); 506 $$->tn_type = gettyp(VOID); 507 } 508 | expression T_SEMI { 509 if ($1 == NULL) { /* in case of syntax errors */ 510 $$ = expr_alloc_tnode(); 511 $$->tn_type = gettyp(VOID); 512 } else { 513 /* XXX: do that only on the last name */ 514 if ($1->tn_op == NAME) 515 $1->tn_sym->s_used = true; 516 expr($1, false, false, false, false); 517 seen_fallthrough = false; 518 $$ = $1; 519 } 520 } 521 ; 522 523 point_or_arrow: /* helper for 'postfix_expression' */ 524 T_POINT { 525 symtyp = FMEMBER; 526 $$ = POINT; 527 } 528 | T_ARROW { 529 symtyp = FMEMBER; 530 $$ = ARROW; 531 } 532 ; 533 534 /* K&R 7.1, C90 ???, C99 6.5.2, C11 6.5.2 */ 535 argument_expression_list: 536 assignment_expression { 537 $$ = build_function_argument(NULL, $1); 538 } 539 | argument_expression_list T_COMMA assignment_expression { 540 $$ = build_function_argument($1, $3); 541 } 542 ; 543 544 /* K&R 7.2, C90 ???, C99 6.5.3, C11 6.5.3 */ 545 unary_expression: 546 postfix_expression 547 | T_INCDEC sys unary_expression { 548 $$ = build_unary($1 == INC ? INCBEF : DECBEF, $2, $3); 549 } 550 | T_AMPER sys cast_expression { 551 $$ = build_unary(ADDR, $2, $3); 552 } 553 | T_ASTERISK sys cast_expression { 554 $$ = build_unary(INDIR, $2, $3); 555 } 556 | T_ADDITIVE sys cast_expression { 557 if (!allow_c90 && $1 == PLUS) { 558 /* unary '+' is illegal in traditional C */ 559 warning(100); 560 } 561 $$ = build_unary($1 == PLUS ? UPLUS : UMINUS, $2, $3); 562 } 563 | T_COMPLEMENT sys cast_expression { 564 $$ = build_unary(COMPL, $2, $3); 565 } 566 | T_LOGNOT sys cast_expression { 567 $$ = build_unary(NOT, $2, $3); 568 } 569 | T_REAL sys cast_expression { /* GCC c_parser_unary_expression */ 570 $$ = build_unary(REAL, $2, $3); 571 } 572 | T_IMAG sys cast_expression { /* GCC c_parser_unary_expression */ 573 $$ = build_unary(IMAG, $2, $3); 574 } 575 | T_EXTENSION cast_expression { /* GCC c_parser_unary_expression */ 576 $$ = $2; 577 } 578 | T_SIZEOF unary_expression { 579 $$ = $2 == NULL ? NULL : build_sizeof($2->tn_type); 580 if ($$ != NULL) 581 check_expr_misc($2, 582 false, false, false, false, false, true); 583 } 584 | T_SIZEOF T_LPAREN type_name T_RPAREN { 585 $$ = build_sizeof($3); 586 } 587 | T_ALIGNOF unary_expression { 588 /* non type argument to alignof is a GCC extension */ 589 gnuism(349); 590 lint_assert($2 != NULL); 591 $$ = build_alignof($2->tn_type); 592 } 593 /* K&R ---, C90 ---, C99 ---, C11 6.5.3 */ 594 | T_ALIGNOF T_LPAREN type_name T_RPAREN { 595 /* TODO: c11ism */ 596 $$ = build_alignof($3); 597 } 598 ; 599 600 /* The rule 'unary_operator' is inlined into unary_expression. */ 601 602 /* K&R 7.2, C90 ???, C99 6.5.4, C11 6.5.4 */ 603 cast_expression: 604 unary_expression 605 | T_LPAREN type_name T_RPAREN cast_expression { 606 $$ = cast($4, $2); 607 } 608 ; 609 610 expression_opt: 611 /* empty */ { 612 $$ = NULL; 613 } 614 | expression 615 ; 616 617 /* 'conditional_expression' also implements 'multiplicative_expression'. */ 618 /* 'conditional_expression' also implements 'additive_expression'. */ 619 /* 'conditional_expression' also implements 'shift_expression'. */ 620 /* 'conditional_expression' also implements 'relational_expression'. */ 621 /* 'conditional_expression' also implements 'equality_expression'. */ 622 /* 'conditional_expression' also implements 'AND_expression'. */ 623 /* 'conditional_expression' also implements 'exclusive_OR_expression'. */ 624 /* 'conditional_expression' also implements 'inclusive_OR_expression'. */ 625 /* 'conditional_expression' also implements 'logical_AND_expression'. */ 626 /* 'conditional_expression' also implements 'logical_OR_expression'. */ 627 /* K&R ???, C90 ???, C99 6.5.5 to 6.5.15, C11 6.5.5 to 6.5.15 */ 628 conditional_expression: 629 cast_expression 630 | conditional_expression T_ASTERISK sys conditional_expression { 631 $$ = build_binary($1, MULT, $3, $4); 632 } 633 | conditional_expression T_MULTIPLICATIVE sys conditional_expression { 634 $$ = build_binary($1, $2, $3, $4); 635 } 636 | conditional_expression T_ADDITIVE sys conditional_expression { 637 $$ = build_binary($1, $2, $3, $4); 638 } 639 | conditional_expression T_SHIFT sys conditional_expression { 640 $$ = build_binary($1, $2, $3, $4); 641 } 642 | conditional_expression T_RELATIONAL sys conditional_expression { 643 $$ = build_binary($1, $2, $3, $4); 644 } 645 | conditional_expression T_EQUALITY sys conditional_expression { 646 $$ = build_binary($1, $2, $3, $4); 647 } 648 | conditional_expression T_AMPER sys conditional_expression { 649 $$ = build_binary($1, BITAND, $3, $4); 650 } 651 | conditional_expression T_BITXOR sys conditional_expression { 652 $$ = build_binary($1, BITXOR, $3, $4); 653 } 654 | conditional_expression T_BITOR sys conditional_expression { 655 $$ = build_binary($1, BITOR, $3, $4); 656 } 657 | conditional_expression T_LOGAND sys conditional_expression { 658 $$ = build_binary($1, LOGAND, $3, $4); 659 } 660 | conditional_expression T_LOGOR sys conditional_expression { 661 $$ = build_binary($1, LOGOR, $3, $4); 662 } 663 | conditional_expression T_QUEST sys 664 expression T_COLON sys conditional_expression { 665 $$ = build_binary($1, QUEST, $3, 666 build_binary($4, COLON, $6, $7)); 667 } 668 ; 669 670 /* K&R ???, C90 ???, C99 6.5.16, C11 6.5.16 */ 671 assignment_expression: 672 conditional_expression 673 | unary_expression T_ASSIGN sys assignment_expression { 674 $$ = build_binary($1, ASSIGN, $3, $4); 675 } 676 | unary_expression T_OPASSIGN sys assignment_expression { 677 $$ = build_binary($1, $2, $3, $4); 678 } 679 ; 680 681 /* K&R ???, C90 ???, C99 6.5.17, C11 6.5.17 */ 682 expression: 683 assignment_expression 684 | expression T_COMMA sys assignment_expression { 685 $$ = build_binary($1, COMMA, $3, $4); 686 } 687 ; 688 689 constant_expr: /* C99 6.6 */ 690 conditional_expression 691 ; 692 693 declaration_or_error: 694 declaration 695 | error T_SEMI 696 ; 697 698 declaration: /* C99 6.7 */ 699 begin_type_declmods end_type T_SEMI { 700 if (dcs->d_scl == TYPEDEF) { 701 /* typedef declares no type name */ 702 warning(72); 703 } else { 704 /* empty declaration */ 705 warning(2); 706 } 707 } 708 | begin_type_declmods end_type notype_init_declarators T_SEMI { 709 if (dcs->d_scl == TYPEDEF) { 710 /* syntax error '%s' */ 711 error(249, "missing base type for typedef"); 712 } else { 713 /* old-style declaration; add 'int' */ 714 error(1); 715 } 716 } 717 | begin_type_declaration_specifiers end_type T_SEMI { 718 if (dcs->d_scl == TYPEDEF) { 719 /* typedef declares no type name */ 720 warning(72); 721 } else if (!dcs->d_nonempty_decl) { 722 /* empty declaration */ 723 warning(2); 724 } 725 } 726 | begin_type_declaration_specifiers end_type 727 type_init_declarators T_SEMI 728 | static_assert_declaration 729 ; 730 731 begin_type_declaration_specifiers: /* see C99 6.7 */ 732 begin_type_typespec { 733 dcs_add_type($1); 734 } 735 | begin_type_declmods type_specifier { 736 dcs_add_type($2); 737 } 738 | type_attribute begin_type_declaration_specifiers 739 | begin_type_declaration_specifiers declmod 740 | begin_type_declaration_specifiers notype_type_specifier { 741 dcs_add_type($2); 742 } 743 ; 744 745 begin_type_declmods: /* see C99 6.7 */ 746 begin_type T_QUAL { 747 dcs_add_qualifier($2); 748 } 749 | begin_type T_SCLASS { 750 dcs_add_storage_class($2); 751 } 752 | begin_type_declmods declmod 753 ; 754 755 begin_type_specifier_qualifier_list: /* see C11 6.7.2.1 */ 756 begin_type_specifier_qualifier_list_postfix 757 | type_attribute_list begin_type_specifier_qualifier_list_postfix 758 ; 759 760 begin_type_specifier_qualifier_list_postfix: 761 begin_type_typespec { 762 dcs_add_type($1); 763 } 764 | begin_type_qualifier_list type_specifier { 765 dcs_add_type($2); 766 } 767 | begin_type_specifier_qualifier_list_postfix T_QUAL { 768 dcs_add_qualifier($2); 769 } 770 | begin_type_specifier_qualifier_list_postfix notype_type_specifier { 771 dcs_add_type($2); 772 } 773 | begin_type_specifier_qualifier_list_postfix type_attribute 774 ; 775 776 begin_type_typespec: 777 begin_type notype_type_specifier { 778 $$ = $2; 779 } 780 | begin_type T_TYPENAME { 781 $$ = getsym($2)->s_type; 782 } 783 ; 784 785 begin_type_qualifier_list: 786 begin_type T_QUAL { 787 dcs_add_qualifier($2); 788 } 789 | begin_type_qualifier_list T_QUAL { 790 dcs_add_qualifier($2); 791 } 792 ; 793 794 declmod: 795 T_QUAL { 796 dcs_add_qualifier($1); 797 } 798 | T_SCLASS { 799 dcs_add_storage_class($1); 800 } 801 | type_attribute_list 802 ; 803 804 type_attribute_list_opt: 805 /* empty */ 806 | type_attribute_list 807 ; 808 809 type_attribute_list: 810 type_attribute 811 | type_attribute_list type_attribute 812 ; 813 814 type_attribute_opt: 815 /* empty */ 816 | type_attribute 817 ; 818 819 type_attribute: /* See C11 6.7 declaration-specifiers */ 820 gcc_attribute_specifier 821 | T_ALIGNAS T_LPAREN type_specifier T_RPAREN /* C11 6.7.5 */ 822 | T_ALIGNAS T_LPAREN constant_expr T_RPAREN /* C11 6.7.5 */ 823 | T_PACKED { 824 dcs_add_packed(); 825 } 826 | T_NORETURN 827 ; 828 829 begin_type: 830 /* empty */ { 831 dcs_begin_type(); 832 } 833 ; 834 835 end_type: 836 /* empty */ { 837 dcs_end_type(); 838 } 839 ; 840 841 type_specifier: /* C99 6.7.2 */ 842 notype_type_specifier 843 | T_TYPENAME { 844 $$ = getsym($1)->s_type; 845 } 846 ; 847 848 notype_type_specifier: /* see C99 6.7.2 */ 849 T_TYPE { 850 $$ = gettyp($1); 851 } 852 | T_TYPEOF T_LPAREN expression T_RPAREN { /* GCC extension */ 853 $$ = block_dup_type($3->tn_type); 854 $$->t_typeof = true; 855 } 856 | struct_or_union_specifier { 857 end_declaration_level(); 858 $$ = $1; 859 } 860 | enum_specifier { 861 end_declaration_level(); 862 $$ = $1; 863 } 864 ; 865 866 struct_or_union_specifier: /* C99 6.7.2.1 */ 867 struct_or_union identifier_sym { 868 /* 869 * STDC requires that "struct a;" always introduces 870 * a new tag if "a" is not declared at current level 871 * 872 * yychar is valid because otherwise the parser would not 873 * have been able to decide if it must shift or reduce 874 */ 875 $$ = make_tag_type($2, $1, false, yychar == T_SEMI); 876 } 877 | struct_or_union identifier_sym { 878 dcs->d_tagtyp = make_tag_type($2, $1, true, false); 879 } braced_struct_declaration_list { 880 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $4); 881 } 882 | struct_or_union { 883 dcs->d_tagtyp = make_tag_type(NULL, $1, true, false); 884 } braced_struct_declaration_list { 885 $$ = complete_tag_struct_or_union(dcs->d_tagtyp, $3); 886 } 887 | struct_or_union error { 888 symtyp = FVFT; 889 $$ = gettyp(INT); 890 } 891 ; 892 893 struct_or_union: /* C99 6.7.2.1 */ 894 T_STRUCT_OR_UNION { 895 symtyp = FTAG; 896 begin_declaration_level($1 == STRUCT 897 ? DK_STRUCT_MEMBER 898 : DK_UNION_MEMBER); 899 dcs->d_offset_in_bits = 0; 900 dcs->d_sou_align_in_bits = CHAR_SIZE; 901 $$ = $1; 902 } 903 | struct_or_union type_attribute 904 ; 905 906 braced_struct_declaration_list: /* see C99 6.7.2.1 */ 907 struct_declaration_lbrace struct_declaration_list_with_rbrace { 908 $$ = $2; 909 } 910 ; 911 912 struct_declaration_lbrace: /* see C99 6.7.2.1 */ 913 T_LBRACE { 914 symtyp = FVFT; 915 } 916 ; 917 918 struct_declaration_list_with_rbrace: /* see C99 6.7.2.1 */ 919 struct_declaration_list T_RBRACE 920 | T_RBRACE { 921 /* XXX: This is not allowed by any C standard. */ 922 $$ = NULL; 923 } 924 ; 925 926 struct_declaration_list: /* C99 6.7.2.1 */ 927 struct_declaration 928 | struct_declaration_list struct_declaration { 929 $$ = concat_lists($1, $2); 930 } 931 ; 932 933 struct_declaration: /* C99 6.7.2.1 */ 934 begin_type_qualifier_list end_type { 935 /* ^^ There is no check for the missing type-specifier. */ 936 /* too late, i know, but getsym() compensates it */ 937 symtyp = FMEMBER; 938 } notype_struct_declarators type_attribute_opt T_SEMI { 939 symtyp = FVFT; 940 $$ = $4; 941 } 942 | begin_type_specifier_qualifier_list end_type { 943 symtyp = FMEMBER; 944 } type_struct_declarators type_attribute_opt T_SEMI { 945 symtyp = FVFT; 946 $$ = $4; 947 } 948 | begin_type_qualifier_list end_type type_attribute_opt T_SEMI { 949 /* syntax error '%s' */ 950 error(249, "member without type"); 951 $$ = NULL; 952 } 953 | begin_type_specifier_qualifier_list end_type type_attribute_opt 954 T_SEMI { 955 symtyp = FVFT; 956 if (!allow_c11 && !allow_gcc) 957 /* anonymous struct/union members is a C11 feature */ 958 warning(49); 959 if (is_struct_or_union(dcs->d_type->t_tspec)) { 960 $$ = dcs->d_type->t_str->sou_first_member; 961 /* add all the members of the anonymous struct/union */ 962 anonymize($$); 963 } else { 964 /* syntax error '%s' */ 965 error(249, "unnamed member"); 966 $$ = NULL; 967 } 968 } 969 | static_assert_declaration { 970 $$ = NULL; 971 } 972 | error T_SEMI { 973 symtyp = FVFT; 974 $$ = NULL; 975 } 976 ; 977 978 notype_struct_declarators: 979 notype_struct_declarator { 980 $$ = declarator_1_struct_union($1); 981 } 982 | notype_struct_declarators { 983 symtyp = FMEMBER; 984 } T_COMMA type_struct_declarator { 985 $$ = concat_lists($1, declarator_1_struct_union($4)); 986 } 987 ; 988 989 type_struct_declarators: 990 type_struct_declarator { 991 $$ = declarator_1_struct_union($1); 992 } 993 | type_struct_declarators { 994 symtyp = FMEMBER; 995 } T_COMMA type_struct_declarator { 996 $$ = concat_lists($1, declarator_1_struct_union($4)); 997 } 998 ; 999 1000 notype_struct_declarator: 1001 notype_declarator 1002 | notype_declarator T_COLON constant_expr { /* C99 6.7.2.1 */ 1003 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1004 } 1005 | { 1006 symtyp = FVFT; 1007 } T_COLON constant_expr { /* C99 6.7.2.1 */ 1008 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1009 } 1010 ; 1011 1012 type_struct_declarator: 1013 type_declarator 1014 | type_declarator T_COLON constant_expr { 1015 $$ = set_bit_field_width($1, to_int_constant($3, true)); 1016 } 1017 | { 1018 symtyp = FVFT; 1019 } T_COLON constant_expr { 1020 $$ = set_bit_field_width(NULL, to_int_constant($3, true)); 1021 } 1022 ; 1023 1024 /* K&R ---, C90 6.5.2.2, C99 6.7.2.2, C11 6.7.2.2 */ 1025 enum_specifier: /* C99 6.7.2.2 */ 1026 enum gcc_attribute_specifier_list_opt identifier_sym { 1027 $$ = make_tag_type($3, ENUM, false, false); 1028 } 1029 | enum gcc_attribute_specifier_list_opt identifier_sym { 1030 dcs->d_tagtyp = make_tag_type($3, ENUM, true, false); 1031 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1032 $$ = complete_tag_enum(dcs->d_tagtyp, $5); 1033 } 1034 | enum gcc_attribute_specifier_list_opt { 1035 dcs->d_tagtyp = make_tag_type(NULL, ENUM, true, false); 1036 } enum_declaration /*gcc_attribute_specifier_list_opt*/ { 1037 $$ = complete_tag_enum(dcs->d_tagtyp, $4); 1038 } 1039 | enum error { 1040 symtyp = FVFT; 1041 $$ = gettyp(INT); 1042 } 1043 ; 1044 1045 enum: /* helper for C99 6.7.2.2 */ 1046 T_ENUM { 1047 symtyp = FTAG; 1048 begin_declaration_level(DK_ENUM_CONSTANT); 1049 } 1050 ; 1051 1052 enum_declaration: /* helper for C99 6.7.2.2 */ 1053 enum_decl_lbrace enums_with_opt_comma T_RBRACE { 1054 $$ = $2; 1055 } 1056 ; 1057 1058 enum_decl_lbrace: /* helper for C99 6.7.2.2 */ 1059 T_LBRACE { 1060 symtyp = FVFT; 1061 enumval = 0; 1062 } 1063 ; 1064 1065 enums_with_opt_comma: /* helper for C99 6.7.2.2 */ 1066 enumerator_list 1067 | enumerator_list T_COMMA { 1068 if (!allow_c99 && !allow_trad) { 1069 /* trailing ',' prohibited in enum declaration */ 1070 error(54); 1071 } else { 1072 /* trailing ',' prohibited in enum declaration */ 1073 c99ism(54); 1074 } 1075 $$ = $1; 1076 } 1077 ; 1078 1079 enumerator_list: /* C99 6.7.2.2 */ 1080 enumerator 1081 | enumerator_list T_COMMA enumerator { 1082 $$ = concat_lists($1, $3); 1083 } 1084 | error { 1085 $$ = NULL; 1086 } 1087 ; 1088 1089 enumerator: /* C99 6.7.2.2 */ 1090 identifier_sym gcc_attribute_specifier_list_opt { 1091 $$ = enumeration_constant($1, enumval, true); 1092 } 1093 | identifier_sym gcc_attribute_specifier_list_opt 1094 T_ASSIGN constant_expr { 1095 $$ = enumeration_constant($1, to_int_constant($4, true), 1096 false); 1097 } 1098 ; 1099 1100 type_qualifier: /* C99 6.7.3 */ 1101 T_QUAL { 1102 $$ = xcalloc(1, sizeof(*$$)); 1103 if ($1 == CONST) 1104 $$->p_const = true; 1105 if ($1 == VOLATILE) 1106 $$->p_volatile = true; 1107 } 1108 ; 1109 1110 pointer: /* C99 6.7.5 */ 1111 asterisk type_qualifier_list_opt { 1112 $$ = merge_qualified_pointer($1, $2); 1113 } 1114 | asterisk type_qualifier_list_opt pointer { 1115 $$ = merge_qualified_pointer($1, $2); 1116 $$ = merge_qualified_pointer($$, $3); 1117 } 1118 ; 1119 1120 asterisk: /* helper for 'pointer' */ 1121 T_ASTERISK { 1122 $$ = xcalloc(1, sizeof(*$$)); 1123 $$->p_pointer = true; 1124 } 1125 ; 1126 1127 type_qualifier_list_opt: /* see C99 6.7.5 */ 1128 /* empty */ { 1129 $$ = NULL; 1130 } 1131 | type_qualifier_list 1132 ; 1133 1134 type_qualifier_list: /* C99 6.7.5 */ 1135 type_qualifier 1136 | type_qualifier_list type_qualifier { 1137 $$ = merge_qualified_pointer($1, $2); 1138 } 1139 ; 1140 1141 /* 1142 * For an explanation of 'notype' in the following rules, see 1143 * https://www.gnu.org/software/bison/manual/bison.html#Semantic-Tokens. 1144 */ 1145 1146 notype_init_declarators: 1147 notype_init_declarator 1148 | notype_init_declarators T_COMMA type_init_declarator 1149 ; 1150 1151 type_init_declarators: 1152 type_init_declarator 1153 | type_init_declarators T_COMMA type_init_declarator 1154 ; 1155 1156 notype_init_declarator: 1157 notype_declarator asm_or_symbolrename_opt { 1158 cgram_declare($1, false, $2); 1159 check_size($1); 1160 } 1161 | notype_declarator asm_or_symbolrename_opt { 1162 begin_initialization($1); 1163 cgram_declare($1, true, $2); 1164 } T_ASSIGN initializer { 1165 check_size($1); 1166 end_initialization(); 1167 } 1168 ; 1169 1170 type_init_declarator: 1171 type_declarator asm_or_symbolrename_opt { 1172 cgram_declare($1, false, $2); 1173 check_size($1); 1174 } 1175 | type_declarator asm_or_symbolrename_opt { 1176 begin_initialization($1); 1177 cgram_declare($1, true, $2); 1178 } T_ASSIGN initializer { 1179 check_size($1); 1180 end_initialization(); 1181 } 1182 ; 1183 1184 notype_declarator: 1185 notype_direct_declarator 1186 | pointer notype_direct_declarator { 1187 $$ = add_pointer($2, $1); 1188 } 1189 ; 1190 1191 type_declarator: 1192 type_direct_declarator 1193 | pointer type_direct_declarator { 1194 $$ = add_pointer($2, $1); 1195 } 1196 ; 1197 1198 notype_direct_declarator: 1199 type_attribute_list_opt T_NAME { 1200 $$ = declarator_name(getsym($2)); 1201 } 1202 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1203 $$ = $3; 1204 } 1205 | notype_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1206 $$ = add_array($1, $3.has_dim, $3.dim); 1207 } 1208 | notype_direct_declarator param_list asm_or_symbolrename_opt { 1209 $$ = add_function(symbolrename($1, $3), $2); 1210 end_declaration_level(); 1211 block_level--; 1212 } 1213 | notype_direct_declarator type_attribute 1214 ; 1215 1216 type_direct_declarator: 1217 type_attribute_list_opt identifier { 1218 $$ = declarator_name(getsym($2)); 1219 } 1220 | type_attribute_list_opt T_LPAREN type_declarator T_RPAREN { 1221 $$ = $3; 1222 } 1223 | type_direct_declarator T_LBRACK array_size_opt T_RBRACK { 1224 $$ = add_array($1, $3.has_dim, $3.dim); 1225 } 1226 | type_direct_declarator param_list asm_or_symbolrename_opt { 1227 $$ = add_function(symbolrename($1, $3), $2); 1228 end_declaration_level(); 1229 block_level--; 1230 } 1231 | type_direct_declarator type_attribute 1232 ; 1233 1234 /* 1235 * The two distinct rules type_param_declarator and notype_param_declarator 1236 * avoid a conflict in argument lists. A typename enclosed in parentheses is 1237 * always treated as a typename, not an argument name. For example, after 1238 * "typedef double a;", the declaration "f(int (a));" is interpreted as 1239 * "f(int (double));", not "f(int a);". 1240 */ 1241 type_param_declarator: 1242 direct_param_declarator 1243 | pointer direct_param_declarator { 1244 $$ = add_pointer($2, $1); 1245 } 1246 ; 1247 1248 notype_param_declarator: 1249 direct_notype_param_declarator 1250 | pointer direct_notype_param_declarator { 1251 $$ = add_pointer($2, $1); 1252 } 1253 ; 1254 1255 direct_param_declarator: 1256 identifier type_attribute_list { 1257 $$ = declarator_name(getsym($1)); 1258 } 1259 | identifier { 1260 $$ = declarator_name(getsym($1)); 1261 } 1262 | T_LPAREN notype_param_declarator T_RPAREN { 1263 $$ = $2; 1264 } 1265 | direct_param_declarator T_LBRACK array_size_opt T_RBRACK 1266 gcc_attribute_specifier_list_opt { 1267 $$ = add_array($1, $3.has_dim, $3.dim); 1268 } 1269 | direct_param_declarator param_list asm_or_symbolrename_opt { 1270 $$ = add_function(symbolrename($1, $3), $2); 1271 end_declaration_level(); 1272 block_level--; 1273 } 1274 ; 1275 1276 direct_notype_param_declarator: 1277 identifier { 1278 $$ = declarator_name(getsym($1)); 1279 } 1280 | T_LPAREN notype_param_declarator T_RPAREN { 1281 $$ = $2; 1282 } 1283 | direct_notype_param_declarator T_LBRACK array_size_opt T_RBRACK { 1284 $$ = add_array($1, $3.has_dim, $3.dim); 1285 } 1286 | direct_notype_param_declarator param_list asm_or_symbolrename_opt { 1287 $$ = add_function(symbolrename($1, $3), $2); 1288 end_declaration_level(); 1289 block_level--; 1290 } 1291 ; 1292 1293 param_list: 1294 id_list_lparen identifier_list T_RPAREN { 1295 $$ = $2; 1296 } 1297 | abstract_decl_param_list 1298 ; 1299 1300 id_list_lparen: 1301 T_LPAREN { 1302 block_level++; 1303 begin_declaration_level(DK_PROTO_ARG); 1304 } 1305 ; 1306 1307 array_size_opt: 1308 /* empty */ { 1309 $$.has_dim = false; 1310 $$.dim = 0; 1311 } 1312 | T_ASTERISK { 1313 /* since C99; variable length array of unspecified size */ 1314 $$.has_dim = false; /* TODO: maybe change to true */ 1315 $$.dim = 0; /* just as a placeholder */ 1316 } 1317 | array_size { 1318 $$.has_dim = true; 1319 $$.dim = $1 == NULL ? 0 : to_int_constant($1, false); 1320 } 1321 ; 1322 1323 array_size: 1324 type_qualifier_list_opt T_SCLASS constant_expr { 1325 /* C11 6.7.6.3p7 */ 1326 if ($2 != STATIC) 1327 yyerror("Bad attribute"); 1328 /* static array size is a C11 extension */ 1329 c11ism(343); 1330 $$ = $3; 1331 } 1332 | T_QUAL { 1333 /* C11 6.7.6.2 */ 1334 if ($1 != RESTRICT) 1335 yyerror("Bad attribute"); 1336 $$ = NULL; 1337 } 1338 | constant_expr 1339 ; 1340 1341 identifier_list: /* C99 6.7.5 */ 1342 T_NAME { 1343 $$ = old_style_function_name(getsym($1)); 1344 } 1345 | identifier_list T_COMMA T_NAME { 1346 $$ = concat_lists($1, old_style_function_name(getsym($3))); 1347 } 1348 | identifier_list error 1349 ; 1350 1351 /* XXX: C99 requires an additional specifier-qualifier-list. */ 1352 type_name: /* C99 6.7.6 */ 1353 { 1354 begin_declaration_level(DK_ABSTRACT); 1355 } abstract_declaration { 1356 end_declaration_level(); 1357 $$ = $2->s_type; 1358 } 1359 ; 1360 1361 abstract_declaration: /* specific to lint */ 1362 begin_type_qualifier_list end_type { 1363 $$ = declare_1_abstract(abstract_name()); 1364 } 1365 | begin_type_specifier_qualifier_list end_type { 1366 $$ = declare_1_abstract(abstract_name()); 1367 } 1368 | begin_type_qualifier_list end_type abstract_declarator { 1369 $$ = declare_1_abstract($3); 1370 } 1371 | begin_type_specifier_qualifier_list end_type abstract_declarator { 1372 $$ = declare_1_abstract($3); 1373 } 1374 ; 1375 1376 /* K&R 8.7, C90 ???, C99 6.7.6, C11 6.7.7 */ 1377 /* In K&R, abstract-declarator could be empty and was still simpler. */ 1378 abstract_declarator: 1379 pointer { 1380 $$ = add_pointer(abstract_name(), $1); 1381 } 1382 | direct_abstract_declarator 1383 | pointer direct_abstract_declarator { 1384 $$ = add_pointer($2, $1); 1385 } 1386 | type_attribute_list direct_abstract_declarator { 1387 $$ = $2; 1388 } 1389 | pointer type_attribute_list direct_abstract_declarator { 1390 $$ = add_pointer($3, $1); 1391 } 1392 ; 1393 1394 /* K&R ---, C90 ???, C99 6.7.6, C11 6.7.7 */ 1395 direct_abstract_declarator: 1396 /* TODO: sort rules according to C99 */ 1397 T_LPAREN abstract_declarator T_RPAREN { 1398 $$ = $2; 1399 } 1400 | T_LBRACK array_size_opt T_RBRACK { 1401 $$ = add_array(abstract_name(), $2.has_dim, $2.dim); 1402 } 1403 | direct_abstract_declarator T_LBRACK array_size_opt T_RBRACK { 1404 $$ = add_array($1, $3.has_dim, $3.dim); 1405 } 1406 | abstract_decl_param_list asm_or_symbolrename_opt { 1407 $$ = add_function(symbolrename(abstract_name(), $2), $1); 1408 end_declaration_level(); 1409 block_level--; 1410 } 1411 | direct_abstract_declarator abstract_decl_param_list 1412 asm_or_symbolrename_opt { 1413 $$ = add_function(symbolrename($1, $3), $2); 1414 end_declaration_level(); 1415 block_level--; 1416 } 1417 | direct_abstract_declarator type_attribute_list 1418 ; 1419 1420 abstract_decl_param_list: /* specific to lint */ 1421 abstract_decl_lparen T_RPAREN type_attribute_opt { 1422 $$ = NULL; 1423 } 1424 | abstract_decl_lparen vararg_parameter_type_list T_RPAREN 1425 type_attribute_opt { 1426 dcs->d_proto = true; 1427 $$ = $2; 1428 } 1429 | abstract_decl_lparen error T_RPAREN type_attribute_opt { 1430 $$ = NULL; 1431 } 1432 ; 1433 1434 abstract_decl_lparen: /* specific to lint */ 1435 T_LPAREN { 1436 block_level++; 1437 begin_declaration_level(DK_PROTO_ARG); 1438 } 1439 ; 1440 1441 vararg_parameter_type_list: /* specific to lint */ 1442 parameter_type_list 1443 | parameter_type_list T_COMMA T_ELLIPSIS { 1444 dcs->d_vararg = true; 1445 $$ = $1; 1446 } 1447 | T_ELLIPSIS { 1448 /* TODO: C99 6.7.5 makes this an error as well. */ 1449 if (!allow_trad && !allow_c99) { 1450 /* ANSI C requires formal parameter before '...' */ 1451 error(84); 1452 } else if (allow_c90) { 1453 /* ANSI C requires formal parameter before '...' */ 1454 warning(84); 1455 } 1456 dcs->d_vararg = true; 1457 $$ = NULL; 1458 } 1459 ; 1460 1461 /* XXX: C99 6.7.5 defines the same name, but it looks different. */ 1462 parameter_type_list: 1463 parameter_declaration 1464 | parameter_type_list T_COMMA parameter_declaration { 1465 $$ = concat_lists($1, $3); 1466 } 1467 ; 1468 1469 /* XXX: C99 6.7.5 defines the same name, but it looks completely different. */ 1470 parameter_declaration: 1471 begin_type_declmods end_type { 1472 /* ^^ There is no check for the missing type-specifier. */ 1473 $$ = declare_argument(abstract_name(), false); 1474 } 1475 | begin_type_declaration_specifiers end_type { 1476 $$ = declare_argument(abstract_name(), false); 1477 } 1478 | begin_type_declmods end_type notype_param_declarator { 1479 /* ^^ There is no check for the missing type-specifier. */ 1480 $$ = declare_argument($3, false); 1481 } 1482 /* 1483 * type_param_declarator is needed because of following conflict: 1484 * "typedef int a; f(int (a));" could be parsed as 1485 * "function with argument a of type int", or 1486 * "function with an abstract argument of type function". 1487 * This grammar realizes the second case. 1488 */ 1489 | begin_type_declaration_specifiers end_type type_param_declarator { 1490 $$ = declare_argument($3, false); 1491 } 1492 | begin_type_declmods end_type abstract_declarator { 1493 /* ^^ There is no check for the missing type-specifier. */ 1494 $$ = declare_argument($3, false); 1495 } 1496 | begin_type_declaration_specifiers end_type abstract_declarator { 1497 $$ = declare_argument($3, false); 1498 } 1499 ; 1500 1501 initializer: /* C99 6.7.8 "Initialization" */ 1502 assignment_expression { 1503 init_expr($1); 1504 } 1505 | init_lbrace init_rbrace { 1506 /* XXX: Empty braces are not covered by C99 6.7.8. */ 1507 } 1508 | init_lbrace initializer_list comma_opt init_rbrace 1509 /* XXX: What is this error handling for? */ 1510 | error 1511 ; 1512 1513 initializer_list: /* C99 6.7.8 "Initialization" */ 1514 initializer_list_item 1515 | initializer_list T_COMMA initializer_list_item 1516 ; 1517 1518 initializer_list_item: /* helper */ 1519 designation initializer 1520 | initializer 1521 ; 1522 1523 designation: /* C99 6.7.8 "Initialization" */ 1524 begin_designation designator_list T_ASSIGN 1525 | identifier T_COLON { 1526 /* GCC style struct or union member name in initializer */ 1527 gnuism(315); 1528 begin_designation(); 1529 add_designator_member($1); 1530 } 1531 ; 1532 1533 begin_designation: /* lint-specific helper */ 1534 /* empty */ { 1535 begin_designation(); 1536 } 1537 ; 1538 1539 designator_list: /* C99 6.7.8 "Initialization" */ 1540 designator 1541 | designator_list designator 1542 ; 1543 1544 designator: /* C99 6.7.8 "Initialization" */ 1545 T_LBRACK range T_RBRACK { 1546 if (!allow_c99) 1547 /* array initializer with designators is a C99 ... */ 1548 warning(321); 1549 add_designator_subscript($2); 1550 } 1551 | T_POINT identifier { 1552 if (!allow_c99) 1553 /* struct or union member name in initializer is ... */ 1554 warning(313); 1555 add_designator_member($2); 1556 } 1557 ; 1558 1559 static_assert_declaration: 1560 T_STATIC_ASSERT T_LPAREN constant_expr T_COMMA T_STRING T_RPAREN T_SEMI /* C11 */ 1561 | T_STATIC_ASSERT T_LPAREN constant_expr T_RPAREN T_SEMI /* C23 */ 1562 ; 1563 1564 range: 1565 constant_expr { 1566 $$.lo = to_int_constant($1, true); 1567 $$.hi = $$.lo; 1568 } 1569 | constant_expr T_ELLIPSIS constant_expr { 1570 $$.lo = to_int_constant($1, true); 1571 $$.hi = to_int_constant($3, true); 1572 /* initialization with '[a...b]' is a GCC extension */ 1573 gnuism(340); 1574 } 1575 ; 1576 1577 init_lbrace: /* helper */ 1578 T_LBRACE { 1579 init_lbrace(); 1580 } 1581 ; 1582 1583 init_rbrace: /* helper */ 1584 T_RBRACE { 1585 init_rbrace(); 1586 } 1587 ; 1588 1589 asm_or_symbolrename_opt: /* GCC extensions */ 1590 /* empty */ { 1591 $$ = NULL; 1592 } 1593 | T_ASM T_LPAREN T_STRING T_RPAREN gcc_attribute_specifier_list_opt { 1594 freeyyv(&$3, T_STRING); 1595 $$ = NULL; 1596 } 1597 | T_SYMBOLRENAME T_LPAREN T_NAME T_RPAREN 1598 gcc_attribute_specifier_list_opt { 1599 $$ = $3; 1600 } 1601 ; 1602 1603 statement: /* C99 6.8 */ 1604 expression_statement 1605 | non_expr_statement 1606 ; 1607 1608 non_expr_statement: /* helper for C99 6.8 */ 1609 gcc_attribute_specifier /* ((__fallthrough__)) */ T_SEMI 1610 | labeled_statement 1611 | compound_statement 1612 | selection_statement 1613 | iteration_statement 1614 | jump_statement { 1615 seen_fallthrough = false; 1616 } 1617 | asm_statement 1618 ; 1619 1620 labeled_statement: /* C99 6.8.1 */ 1621 label gcc_attribute_specifier_list_opt statement 1622 ; 1623 1624 label: 1625 T_NAME T_COLON { 1626 symtyp = FLABEL; 1627 named_label(getsym($1)); 1628 } 1629 | T_CASE constant_expr T_COLON { 1630 case_label($2); 1631 seen_fallthrough = true; 1632 } 1633 | T_CASE constant_expr T_ELLIPSIS constant_expr T_COLON { 1634 /* XXX: We don't fill all cases */ 1635 case_label($2); 1636 seen_fallthrough = true; 1637 } 1638 | T_DEFAULT T_COLON { 1639 default_label(); 1640 seen_fallthrough = true; 1641 } 1642 ; 1643 1644 compound_statement: /* C99 6.8.2 */ 1645 compound_statement_lbrace compound_statement_rbrace 1646 | compound_statement_lbrace block_item_list compound_statement_rbrace 1647 ; 1648 1649 compound_statement_lbrace: 1650 T_LBRACE { 1651 block_level++; 1652 mem_block_level++; 1653 begin_declaration_level(DK_AUTO); 1654 } 1655 ; 1656 1657 compound_statement_rbrace: 1658 T_RBRACE { 1659 end_declaration_level(); 1660 level_free_all(mem_block_level); 1661 mem_block_level--; 1662 block_level--; 1663 seen_fallthrough = false; 1664 } 1665 ; 1666 1667 block_item_list: /* C99 6.8.2 */ 1668 block_item 1669 | block_item_list block_item { 1670 if ($1 && !$2) 1671 /* declarations after statements is a C99 feature */ 1672 c99ism(327); 1673 $$ = $1 || $2; 1674 } 1675 ; 1676 1677 block_item: /* C99 6.8.2 */ 1678 declaration_or_error { 1679 $$ = false; 1680 restore_warning_flags(); 1681 } 1682 | statement { 1683 $$ = true; 1684 restore_warning_flags(); 1685 } 1686 ; 1687 1688 expression_statement: /* C99 6.8.3 */ 1689 expression T_SEMI { 1690 expr($1, false, false, false, false); 1691 seen_fallthrough = false; 1692 } 1693 | T_SEMI { 1694 check_statement_reachable(); 1695 seen_fallthrough = false; 1696 } 1697 ; 1698 1699 selection_statement: /* C99 6.8.4 */ 1700 if_without_else %prec T_THEN { 1701 save_warning_flags(); 1702 if2(); 1703 if3(false); 1704 } 1705 | if_without_else T_ELSE { 1706 save_warning_flags(); 1707 if2(); 1708 } statement { 1709 clear_warning_flags(); 1710 if3(true); 1711 } 1712 | if_without_else T_ELSE error { 1713 clear_warning_flags(); 1714 if3(false); 1715 } 1716 | switch_expr statement { 1717 clear_warning_flags(); 1718 switch2(); 1719 } 1720 | switch_expr error { 1721 clear_warning_flags(); 1722 switch2(); 1723 } 1724 ; 1725 1726 if_without_else: /* see C99 6.8.4 */ 1727 if_expr statement 1728 | if_expr error 1729 ; 1730 1731 if_expr: /* see C99 6.8.4 */ 1732 T_IF T_LPAREN expression T_RPAREN { 1733 if1($3); 1734 clear_warning_flags(); 1735 } 1736 ; 1737 1738 switch_expr: /* see C99 6.8.4 */ 1739 T_SWITCH T_LPAREN expression T_RPAREN { 1740 switch1($3); 1741 clear_warning_flags(); 1742 } 1743 ; 1744 1745 iteration_statement: /* C99 6.8.5 */ 1746 while_expr statement { 1747 clear_warning_flags(); 1748 while2(); 1749 } 1750 | while_expr error { 1751 clear_warning_flags(); 1752 while2(); 1753 } 1754 | do_statement do_while_expr { 1755 do2($2); 1756 seen_fallthrough = false; 1757 } 1758 | do error { 1759 clear_warning_flags(); 1760 do2(NULL); 1761 } 1762 | for_exprs statement { 1763 clear_warning_flags(); 1764 for2(); 1765 end_declaration_level(); 1766 block_level--; 1767 } 1768 | for_exprs error { 1769 clear_warning_flags(); 1770 for2(); 1771 end_declaration_level(); 1772 block_level--; 1773 } 1774 ; 1775 1776 while_expr: /* see C99 6.8.5 */ 1777 T_WHILE T_LPAREN expression T_RPAREN { 1778 while1($3); 1779 clear_warning_flags(); 1780 } 1781 ; 1782 1783 do_statement: /* see C99 6.8.5 */ 1784 do statement { 1785 clear_warning_flags(); 1786 } 1787 ; 1788 1789 do: /* see C99 6.8.5 */ 1790 T_DO { 1791 do1(); 1792 } 1793 ; 1794 1795 do_while_expr: /* see C99 6.8.5 */ 1796 T_WHILE T_LPAREN expression T_RPAREN T_SEMI { 1797 $$ = $3; 1798 } 1799 ; 1800 1801 for_start: /* see C99 6.8.5 */ 1802 T_FOR T_LPAREN { 1803 begin_declaration_level(DK_AUTO); 1804 block_level++; 1805 } 1806 ; 1807 1808 for_exprs: /* see C99 6.8.5 */ 1809 for_start 1810 begin_type_declaration_specifiers end_type 1811 notype_init_declarators T_SEMI 1812 expression_opt T_SEMI 1813 expression_opt T_RPAREN { 1814 /* variable declaration in for loop */ 1815 c99ism(325); 1816 for1(NULL, $6, $8); 1817 clear_warning_flags(); 1818 } 1819 | for_start 1820 expression_opt T_SEMI 1821 expression_opt T_SEMI 1822 expression_opt T_RPAREN { 1823 for1($2, $4, $6); 1824 clear_warning_flags(); 1825 } 1826 ; 1827 1828 jump_statement: /* C99 6.8.6 */ 1829 goto identifier T_SEMI { 1830 do_goto(getsym($2)); 1831 } 1832 | goto error T_SEMI { 1833 symtyp = FVFT; 1834 } 1835 | T_CONTINUE T_SEMI { 1836 do_continue(); 1837 } 1838 | T_BREAK T_SEMI { 1839 do_break(); 1840 } 1841 | T_RETURN sys T_SEMI { 1842 do_return($2, NULL); 1843 } 1844 | T_RETURN sys expression T_SEMI { 1845 do_return($2, $3); 1846 } 1847 ; 1848 1849 goto: /* see C99 6.8.6 */ 1850 T_GOTO { 1851 symtyp = FLABEL; 1852 } 1853 ; 1854 1855 asm_statement: /* GCC extension */ 1856 T_ASM T_LPAREN read_until_rparen T_SEMI { 1857 dcs_set_asm(); 1858 } 1859 | T_ASM T_QUAL T_LPAREN read_until_rparen T_SEMI { 1860 dcs_set_asm(); 1861 } 1862 | T_ASM error 1863 ; 1864 1865 read_until_rparen: /* helper for 'asm_statement' */ 1866 /* empty */ { 1867 read_until_rparen(); 1868 } 1869 ; 1870 1871 translation_unit: /* C99 6.9 */ 1872 external_declaration 1873 | translation_unit external_declaration 1874 ; 1875 1876 external_declaration: /* C99 6.9 */ 1877 function_definition { 1878 global_clean_up_decl(false); 1879 clear_warning_flags(); 1880 } 1881 | top_level_declaration { 1882 global_clean_up_decl(false); 1883 clear_warning_flags(); 1884 } 1885 | asm_statement /* GCC extension */ 1886 | T_SEMI { /* GCC extension */ 1887 /* 1888 * TODO: Only allow this in GCC mode, not in plain C99. 1889 * This is one of the top 10 warnings in the NetBSD build. 1890 */ 1891 if (!allow_trad && !allow_c99) { 1892 /* empty declaration */ 1893 error(0); 1894 } else if (allow_c90) { 1895 /* empty declaration */ 1896 warning(0); 1897 } 1898 } 1899 ; 1900 1901 /* 1902 * On the top level, lint allows several forms of declarations that it doesn't 1903 * allow in functions. For example, a single ';' is an empty declaration and 1904 * is supported by some compilers, but in a function it would be an empty 1905 * statement, not a declaration. This makes a difference in C90 mode, where 1906 * a statement must not be followed by a declaration. 1907 * 1908 * See 'declaration' for all other declarations. 1909 */ 1910 top_level_declaration: /* C99 6.9 calls this 'declaration' */ 1911 begin_type end_type notype_init_declarators T_SEMI { 1912 /* TODO: Make this an error in C99 mode as well. */ 1913 if (!allow_trad && !allow_c99) { 1914 /* old-style declaration; add 'int' */ 1915 error(1); 1916 } else if (allow_c90) { 1917 /* old-style declaration; add 'int' */ 1918 warning(1); 1919 } 1920 } 1921 | declaration 1922 | error T_SEMI { 1923 global_clean_up(); 1924 } 1925 | error T_RBRACE { 1926 global_clean_up(); 1927 } 1928 ; 1929 1930 function_definition: /* C99 6.9.1 */ 1931 func_declarator { 1932 if ($1->s_type->t_tspec != FUNC) { 1933 /* syntax error '%s' */ 1934 error(249, yytext); 1935 YYERROR; 1936 } 1937 if ($1->s_type->t_typedef) { 1938 /* ()-less function definition */ 1939 error(64); 1940 YYERROR; 1941 } 1942 funcdef($1); 1943 block_level++; 1944 begin_declaration_level(DK_OLD_STYLE_ARG); 1945 if (lwarn == LWARN_NONE) 1946 $1->s_used = true; 1947 } arg_declaration_list_opt { 1948 end_declaration_level(); 1949 block_level--; 1950 check_func_lint_directives(); 1951 check_func_old_style_arguments(); 1952 begin_control_statement(CS_FUNCTION_BODY); 1953 } compound_statement { 1954 funcend(); 1955 end_control_statement(CS_FUNCTION_BODY); 1956 } 1957 ; 1958 1959 func_declarator: 1960 begin_type end_type notype_declarator { 1961 if (!allow_trad) { 1962 /* old-style declaration; add 'int' */ 1963 error(1); 1964 } 1965 $$ = $3; 1966 } 1967 | begin_type_declmods end_type notype_declarator { 1968 if (!allow_trad) { 1969 /* old-style declaration; add 'int' */ 1970 error(1); 1971 } 1972 $$ = $3; 1973 } 1974 | begin_type_declaration_specifiers end_type type_declarator { 1975 $$ = $3; 1976 } 1977 ; 1978 1979 arg_declaration_list_opt: /* C99 6.9.1p13 example 1 */ 1980 /* empty */ 1981 | arg_declaration_list 1982 ; 1983 1984 arg_declaration_list: /* C99 6.9.1p13 example 1 */ 1985 arg_declaration 1986 | arg_declaration_list arg_declaration 1987 /* XXX or better "arg_declaration error" ? */ 1988 | error 1989 ; 1990 1991 /* 1992 * "arg_declaration" is separated from "declaration" because it 1993 * needs other error handling. 1994 */ 1995 arg_declaration: 1996 begin_type_declmods end_type T_SEMI { 1997 /* empty declaration */ 1998 warning(2); 1999 } 2000 | begin_type_declmods end_type notype_init_declarators T_SEMI 2001 | begin_type_declaration_specifiers end_type T_SEMI { 2002 if (!dcs->d_nonempty_decl) { 2003 /* empty declaration */ 2004 warning(2); 2005 } else { 2006 /* '%s' declared in argument declaration list */ 2007 warning(3, type_name(dcs->d_type)); 2008 } 2009 } 2010 | begin_type_declaration_specifiers end_type 2011 type_init_declarators T_SEMI { 2012 if (dcs->d_nonempty_decl) { 2013 /* '%s' declared in argument declaration list */ 2014 warning(3, type_name(dcs->d_type)); 2015 } 2016 } 2017 | begin_type_declmods error 2018 | begin_type_declaration_specifiers error 2019 ; 2020 2021 /* https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html */ 2022 gcc_attribute_specifier_list_opt: 2023 /* empty */ 2024 | gcc_attribute_specifier_list 2025 ; 2026 2027 gcc_attribute_specifier_list: 2028 gcc_attribute_specifier 2029 | gcc_attribute_specifier_list gcc_attribute_specifier 2030 ; 2031 2032 gcc_attribute_specifier: 2033 T_ATTRIBUTE T_LPAREN T_LPAREN { 2034 in_gcc_attribute = true; 2035 } gcc_attribute_list { 2036 in_gcc_attribute = false; 2037 } T_RPAREN T_RPAREN 2038 ; 2039 2040 gcc_attribute_list: 2041 gcc_attribute 2042 | gcc_attribute_list T_COMMA gcc_attribute 2043 ; 2044 2045 gcc_attribute: 2046 /* empty */ 2047 | T_NAME { 2048 const char *name = $1->sb_name; 2049 if (is_either(name, "packed", "__packed__")) 2050 dcs_add_packed(); 2051 else if (is_either(name, "used", "__used__") || 2052 is_either(name, "unused", "__unused__")) 2053 dcs_set_used(); 2054 else if (is_either(name, "fallthrough", 2055 "__fallthrough__")) 2056 fallthru(1); 2057 } 2058 | T_NAME T_LPAREN T_RPAREN 2059 | T_NAME T_LPAREN gcc_attribute_parameters T_RPAREN 2060 | T_QUAL { 2061 if ($1 != CONST) 2062 yyerror("Bad attribute"); 2063 } 2064 ; 2065 2066 gcc_attribute_parameters: 2067 constant_expr 2068 | gcc_attribute_parameters T_COMMA constant_expr 2069 ; 2070 2071 sys: 2072 /* empty */ { 2073 $$ = in_system_header; 2074 } 2075 ; 2076 2077 %% 2078 2079 /* ARGSUSED */ 2080 int 2081 yyerror(const char *msg) 2082 { 2083 /* syntax error '%s' */ 2084 error(249, yytext); 2085 if (++sytxerr >= 5) 2086 norecover(); 2087 return 0; 2088 } 2089 2090 #if YYDEBUG && (YYBYACC || YYBISON) 2091 static const char * 2092 cgram_to_string(int token, YYSTYPE val) 2093 { 2094 2095 switch (token) { 2096 case T_INCDEC: 2097 case T_MULTIPLICATIVE: 2098 case T_ADDITIVE: 2099 case T_SHIFT: 2100 case T_RELATIONAL: 2101 case T_EQUALITY: 2102 case T_OPASSIGN: 2103 return modtab[val.y_op].m_name; 2104 case T_SCLASS: 2105 return scl_name(val.y_scl); 2106 case T_TYPE: 2107 case T_STRUCT_OR_UNION: 2108 return tspec_name(val.y_tspec); 2109 case T_QUAL: 2110 return tqual_name(val.y_tqual); 2111 case T_NAME: 2112 return val.y_name->sb_name; 2113 default: 2114 return "<none>"; 2115 } 2116 } 2117 #endif 2118 2119 #if YYDEBUG && YYBISON 2120 static inline void 2121 cgram_print(FILE *output, int token, YYSTYPE val) 2122 { 2123 (void)fprintf(output, "%s", cgram_to_string(token, val)); 2124 } 2125 #endif 2126 2127 static void 2128 cgram_declare(sym_t *decl, bool initflg, sbuf_t *renaming) 2129 { 2130 declare(decl, initflg, renaming); 2131 if (renaming != NULL) 2132 freeyyv(&renaming, T_NAME); 2133 } 2134 2135 /* 2136 * Discard all input tokens up to and including the next 2137 * unmatched right paren 2138 */ 2139 static void 2140 read_until_rparen(void) 2141 { 2142 int level; 2143 2144 if (yychar < 0) 2145 yychar = yylex(); 2146 freeyyv(&yylval, yychar); 2147 2148 level = 1; 2149 while (yychar != T_RPAREN || --level > 0) { 2150 if (yychar == T_LPAREN) { 2151 level++; 2152 } else if (yychar <= 0) { 2153 break; 2154 } 2155 freeyyv(&yylval, yychar = yylex()); 2156 } 2157 2158 yyclearin; 2159 } 2160 2161 static sym_t * 2162 symbolrename(sym_t *s, sbuf_t *sb) 2163 { 2164 if (sb != NULL) 2165 s->s_rename = sb->sb_name; 2166 return s; 2167 } 2168
Indexes created Fri Oct 03 02:09:57 GMT 2025